JP6843608B2 - Gear unit and cold damper - Google Patents

Gear unit and cold damper Download PDF

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JP6843608B2
JP6843608B2 JP2016240654A JP2016240654A JP6843608B2 JP 6843608 B2 JP6843608 B2 JP 6843608B2 JP 2016240654 A JP2016240654 A JP 2016240654A JP 2016240654 A JP2016240654 A JP 2016240654A JP 6843608 B2 JP6843608 B2 JP 6843608B2
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gear
support shaft
reinforcing
tooth
stopper
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JP2018025286A (en
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俊二 齋藤
俊二 齋藤
学 坂本
学 坂本
隆司 原田
隆司 原田
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Nidec Sankyo Corp
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  • Gears, Cams (AREA)
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Description

本発明は、歯車の回転角度範囲を規定する回転規制部を備えるギアユニット、およびかかるギアユニットを備える冷気ダンパに関する。 The present invention relates to a gear unit including a rotation regulating unit that defines a rotation angle range of gears, and a cold air damper including such a gear unit.

冷蔵庫の冷気通路の一部を構成する開口部をバッフルで開閉する冷気ダンパは特許文献１に記載されている。冷気ダンパは、冷気が流通する開口部を備えるフレームと、開口部を開閉するためのバッフルと、ギアユニットとを有する。ギアユニットは、バッフルを駆動する駆動機構と、駆動機構を収容するケースとを備える。駆動機構は、モータと、モータの回転をバッフルに伝達するための輪列とを備える。輪列は、モータの駆動力が伝達される駆動歯車と、駆動歯車に噛合する出力歯車を備える。駆動歯車はケースの壁面から突出する支軸に回転可能に支持されている。出力歯車にはバッフルが連結されている。バッフルは、モータの駆動により、開口部を閉じる閉位置と開口部を開く開位置の間を所定の角度範囲に渡って回転する。 Patent Document 1 describes a cold air damper that opens and closes an opening forming a part of a cold air passage of a refrigerator with a baffle. The cold air damper has a frame having an opening through which cold air flows, a baffle for opening and closing the opening, and a gear unit. The gear unit includes a drive mechanism for driving the baffle and a case for accommodating the drive mechanism. The drive mechanism includes a motor and a train wheel for transmitting the rotation of the motor to the baffle. The train wheel includes a drive gear to which the driving force of the motor is transmitted and an output gear that meshes with the drive gear. The drive gear is rotatably supported by a support shaft protruding from the wall surface of the case. A baffle is connected to the output gear. The baffle is driven by a motor to rotate over a predetermined angular range between the closed position at which the opening is closed and the open position at which the opening is opened.

特許文献１の駆動機構は、駆動歯車の回転角度範囲を規定する回転規制機構を備える。駆動機構は、かかる回転規制機構を備えることにより、バッフルが所定の角度範囲以上に回転することを防止する。回転規制機構は、駆動歯車に設けられた当接部と、ケースの壁面から突出して当接部に当接可能な回転規制部とを備える。歯車は、当接部が回転規制部に当接（衝突）することによって回転が規制される。支軸および回転規制部が突出するケースの壁面は歯車が載置される載置面である。特許文献１において、駆動歯車は欠歯歯車であり、出力歯車は扇形歯車である。 The drive mechanism of Patent Document 1 includes a rotation control mechanism that defines a rotation angle range of the drive gear. The drive mechanism is provided with such a rotation control mechanism to prevent the baffle from rotating beyond a predetermined angle range. The rotation regulation mechanism includes a contact portion provided on the drive gear and a rotation regulation portion that protrudes from the wall surface of the case and can contact the contact portion. The rotation of the gear is regulated by the contact portion contacting (collising) with the rotation restricting portion. The wall surface of the case where the support shaft and the rotation control portion project is the mounting surface on which the gears are mounted. In Patent Document 1, the drive gear is a missing tooth gear and the output gear is a fan-shaped gear.

特開２０１５−２０９９６７号公報Japanese Unexamined Patent Publication No. 2015-209767

特許文献１の回転規制部は、その先端部分に歯車の当接部に当接する度当たり部分を備える。従って、歯車の回転を規制する毎に歯車の当接部と回転規制部とが衝突して回転規制部の基端側（回転規制部におけるケースの壁面との境界部分）に応力が発生すると、回転規制部の基端側に亀裂などが発生する可能性がある。 The rotation restricting portion of Patent Document 1 is provided with a percussion portion that abuts on the contact portion of the gear at the tip portion thereof. Therefore, every time the rotation of the gear is regulated, the contact portion of the gear collides with the rotation regulating portion and stress is generated on the base end side of the rotation regulating portion (the boundary portion between the rotation regulating portion and the wall surface of the case). There is a possibility that cracks or the like may occur on the base end side of the rotation control part.

本発明の課題は、歯車に設けた当接部に当接して前記歯車の回転角度範囲を規定する回転規制部が破損することを防止或いは抑制できるギアユニットを提供することにある。また、このようなギアユニットを備える冷気ダンパを提供することにある。 An object of the present invention is to provide a gear unit capable of preventing or suppressing damage to a rotation restricting portion that abuts on a contact portion provided on a gear and defines a rotation angle range of the gear. Another object of the present invention is to provide a cold air damper provided with such a gear unit.

上記課題を解決するために、本発明のギアユニットは、支持部材のベース部から突出した支軸と、前記支軸によって回転可能に支持され、駆動源からの駆動力が伝達される歯車と、前記歯車が前記支軸の軸線回りを回転する角度範囲を規定する回転規制機構と、を有し、前記回転規制機構は、前記歯車において前記軸線から外周側に離間する位置に設けられた当接部と、前記当接部に前記歯車の回転方向の前方から当接可能に前記支持部材に設けられた回転規制部と、を備え、前記回転規制部は、前記ベース部から前記支軸と同一方向に突出して先端側に前記当接部が当接可能な度当たり部分を備えたストッパ部と、前記ストッパ部において前記度当たり部分より前記ベース部側の根元部分で前記軸線方向からみたときに前記ストッパ部の側壁から外側に張り出した部分からなる補強部と、を備え、前記補強部の側面は、前記ベース部とは反対側の端部が前記ストッパ部の前記側壁に連続し、前記ベース部側の端部が前記ベース部に連続しており、前記補強部は、前記ベース部とは反対側の端部と前記ベース部側の端部との間に、前記軸線方向に対して直交する方向に側面を向けて前記ベース部から前記支軸と同一方向に突出した底上げ部を備えていることを特徴とする。 In order to solve the above problems, the gear unit of the present invention includes a support shaft protruding from the base portion of the support member, a gear rotatably supported by the support shaft, and a gear to which a driving force from a drive source is transmitted. The gear has a rotation regulating mechanism that defines an angle range in which the gear rotates around the axis of the support shaft, and the rotation regulating mechanism is a contact provided at a position separated from the axis on the outer peripheral side of the gear. The contact portion is provided with a rotation restricting portion provided on the support member so as to be able to contact the contact portion from the front in the rotation direction of the gear, and the rotation regulating portion is the same as the support shaft from the base portion. When viewed from the axial direction at a stopper portion that protrudes in the direction and has a perforated portion on the tip side to which the abutting portion can abut, and a root portion of the stopper portion that is closer to the base portion than the perforated portion. A reinforcing portion formed of a portion protruding outward from the side wall of the stopper portion is provided, and the side surface of the reinforcing portion has an end portion opposite to the base portion continuous with the side wall of the stopper portion, and the base. The end portion on the portion side is continuous with the base portion, and the reinforcing portion is orthogonal to the axial direction between the end portion on the side opposite to the base portion and the end portion on the base portion side. It is characterized by having a bottom raising portion protruding from the base portion in the same direction as the support shaft with the side surface facing in the direction of the gear.

本発明では、回転規制部が、ベース部から突出して先端部分に歯車の当接部に当接可能な度当たり部分を備えるストッパ部と、ストッパ部から外側に張り出す補強部とを備える。ここで、補強部は、ベース部とは反対側の端部がストッパ部の前記側壁に連続し、ベース部側の端部がベース部に連続しているので、歯車の回転を規制する毎に歯車の当接部とストッパ部の度当たり部分とが衝突してストッパ部の基端部分（根元部分）に応力が頻繁に発生する場合でも、補強部によって、回転規制部に亀裂などの破損が発生することを防止或いは抑制できる。また、補強部は、ストッパ部の根元部分に設けられているため、補強部と歯車の当接部とが干渉することがない。さらに、補強部は、ベース部とは反対側の端部とベース部側の端部との間に、軸線方向に対して直交する方向に側面を向けてベース部から支軸と同一方向に突出した底上げ部を備えている。従って、補強部をストッパ部の先端側まで設けることができるので、回転規制部が損傷することを防止できる。 In the present invention, the rotation restricting portion includes a stopper portion that protrudes from the base portion and has a perforated portion that can come into contact with the contact portion of the gear at the tip portion, and a reinforcing portion that projects outward from the stopper portion. Here, in the reinforcing portion, the end portion on the side opposite to the base portion is continuous with the side wall of the stopper portion, and the end portion on the base portion side is continuous with the base portion. Even if the contact part of the gear collides with the perforated part of the stopper part and stress is frequently generated at the base end part (root part) of the stopper part, the reinforcing part causes damage such as cracks in the rotation restricting part. It can be prevented or suppressed from occurring. Further, since the reinforcing portion is provided at the base portion of the stopper portion, the reinforcing portion and the contact portion of the gear do not interfere with each other. Further, the reinforcing portion projects from the base portion in the same direction as the support shaft with the side surface facing in a direction orthogonal to the axial direction between the end portion on the side opposite to the base portion and the end portion on the base portion side. It has a raised bottom. Therefore, since the reinforcing portion can be provided up to the tip end side of the stopper portion, it is possible to prevent the rotation restricting portion from being damaged.

本発明において、前記補強部の前記側面は、前記ベース部とは反対側の端部で凹曲面または斜面になっている態様を採用することができる。すなわち、補強部の側面は、ベース部とは反対側の端部を支軸の軸線に平行な面で切断したとき、凹状の円弧等の曲線、あるいは斜線になっている態様を採用することができる。かかる態様によれば、補強部のベース部とは反対側の端部とストッパ部の側壁との間に段部が発生しないので、段部に応力が集中し、ストッパ部が破損する等の事態が発生しにくい。 In the present invention, it is possible to adopt an aspect in which the side surface of the reinforcing portion has a concave curved surface or a slope at an end portion opposite to the base portion. That is, the side surface of the reinforcing portion may adopt a form in which a curved line such as a concave arc or a diagonal line is formed when the end portion on the opposite side of the base portion is cut along a plane parallel to the axis of the support shaft. it can. According to this aspect, since a step portion is not generated between the end portion of the reinforcing portion opposite to the base portion and the side wall of the stopper portion, stress is concentrated on the step portion and the stopper portion is damaged. Is unlikely to occur.

本発明において、前記補強部として、前記ストッパ部の前記側壁から前記軸線回りの周方向に張り出した周方向補強部を備える態様を採用することができる。歯車の当接部は周方向から度当たり部分に当接するので、ストッパ部には衝突の衝撃が周方向に加わりやすい。従って、補強部として、ストッパ部から当接部の側に向かって周方向に張り出す周方向補強部を備えれば、ストッパ部と当接部との当接の衝撃によって回転規制部が損傷することを、より抑制できる。 In the present invention, it is possible to adopt an embodiment in which the reinforcing portion includes a circumferential reinforcing portion projecting from the side wall of the stopper portion in the circumferential direction around the axis. Since the contact portion of the gear abuts on the degree hit portion from the circumferential direction, the impact of collision is likely to be applied to the stopper portion in the circumferential direction. Therefore, if the reinforcing portion is provided with a circumferential reinforcing portion that projects in the circumferential direction from the stopper portion toward the contact portion side, the rotation restricting portion is damaged by the impact of the contact between the stopper portion and the contact portion. That can be suppressed more.

この場合、前記周方向補強部は、前記ベース部とは反対側の端部が前記ストッパ部の前記側壁になめらかに連続することが望ましい。かかる態様によれば、ストッパ部と周方向補強部との境界部分に対する応力の集中を緩和できる。従って、回転規制部が損傷することを防止できる。 In this case, it is desirable that the end portion of the circumferential reinforcing portion on the side opposite to the base portion smoothly continues to the side wall of the stopper portion. According to such an aspect, the concentration of stress on the boundary portion between the stopper portion and the circumferential reinforcing portion can be relaxed. Therefore, it is possible to prevent the rotation restricting portion from being damaged.

本発明において、前記補強部として、前記ストッパ部の前記側壁から前記支軸から離間する径方向外側に張り出した径方向外側補強部を備える態様を採用することができる。歯車の当接部が度当たり部分に当接した場合には、衝突の衝撃の分力が、ストッパ部の径方向にも作用する。従って、補強部がストッパ部から径方向の外周側に張り出す径方向外側補強部を備えれば、ストッパ部と当接部との当接によって回転規制部が損傷することを抑制できる。 In the present invention, it is possible to adopt an embodiment in which the reinforcing portion includes a radial outer reinforcing portion that projects radially outward from the side wall of the stopper portion and is separated from the support shaft. When the contact portion of the gear comes into contact with the hit portion, the component force of the impact of the collision also acts in the radial direction of the stopper portion. Therefore, if the reinforcing portion is provided with a radial outer reinforcing portion that projects from the stopper portion to the outer peripheral side in the radial direction, it is possible to prevent the rotation restricting portion from being damaged by the contact between the stopper portion and the contact portion.

この場合、前記径方向外側補強部は、前記ベース部とは反対側の端部が前記ストッパ部の前記側壁になめらかに連続することが望ましい。かかる態様によれば、ストッパ部における径方向外側補強部との境界部分への応力の集中を緩和できる。従って、回転規制部が損傷することを防止できる。 In this case, it is desirable that the end portion of the radial outer reinforcing portion opposite to the base portion smoothly continues to the side wall of the stopper portion. According to such an aspect, the concentration of stress on the boundary portion between the stopper portion and the radial outer reinforcing portion can be relaxed. Therefore, it is possible to prevent the rotation restricting portion from being damaged.

本発明において、前記度当たり部分は、前記軸線周りの周方向に向いた平面であることが望ましい。このようにすれば、歯車の当接部が度当たり部分に当接したときに、歯車の回転角度範囲を正確に規定できる。 In the present invention, it is desirable that the perforated portion is a plane oriented in the circumferential direction around the axis. In this way, when the contact portion of the gear comes into contact with the hit portion, the rotation angle range of the gear can be accurately defined.

本発明において、前記ベース部は、前記支軸と同一方向に段状に突出して一部が、前記歯車が載置される載置面とされる台座部分を含み、前記支軸および前記ストッパ部は、前記台座部分から突出している態様を採用することができる。 In the present invention, the base portion includes a pedestal portion that projects stepwise in the same direction as the support shaft and is a mounting surface on which the gear is mounted, and the support shaft and the stopper portion. Can adopt a mode protruding from the pedestal portion.

この場合、前記補強部の少なくとも一部は、前記ベース部側の端部が前記ベース部のうち、前記台座部分に連続している態様を採用することができる。 In this case, at least a part of the reinforcing portion can adopt a mode in which the end portion on the base portion side is continuous with the pedestal portion of the base portion.

次に、本発明のギアユニットは、支持部材のベース部から突出した支軸と、前記支軸によって回転可能に支持され、駆動源からの駆動力が伝達される歯車と、前記歯車が前記支軸の軸線回りを回転する角度範囲を規定する回転規制機構と、を有し、前記回転規制機構は、前記歯車において前記軸線から外周側に離間する位置に設けられた当接部と、前記当接部に前記歯車の回転方向の前方から当接可能に前記支持部材に設けられた回転規制部と、を備え、前記回転規制部は、前記ベース部から前記支軸と同一方向に突出して先端側に前記当接部が当接可能な度当たり部分を備えたストッパ部と、前記ストッパ部において前記度当たり部分より前記ベース部側の根元部分で前記軸線方向からみたときに前記ストッパ部の側壁から外側に張り出した部分からなる補強部と、を備え、前記補強部の側面は、前記ベース部とは反対側の端部が前記ストッパ部の前記側壁に連続し、前記ベース部側の端部が前記ベース部に連続しており、前記補強部は、側面全体が凹曲面または斜面に形成されており、前記補強部は、前記ストッパ部から前記支軸が位置する径方向内側に張り出した径方向内側補強部を含んで前記ストッパ部の全周に形成されており、前記径方向内側補強部は、前記補強部のうち、前記径方向内側補強部以外の補強部よりの前記軸線方向における寸法が小さいことを特徴とする。かかる態様により、本発明によれば、径方向内側補強部と歯車との干渉を回避することができる。 Next, in the gear unit of the present invention, a support shaft protruding from the base portion of the support member, a gear rotatably supported by the support shaft, and a driving force from a drive source is transmitted, and the gear supports the support. It has a rotation regulating mechanism that defines an angle range for rotating around the axis of the shaft, and the rotation regulating mechanism has a contact portion provided at a position separated from the axis on the outer peripheral side of the gear, and the contact portion. The contact portion is provided with a rotation restricting portion provided on the support member so as to be able to come into contact with the gear from the front in the rotation direction of the gear, and the rotation regulating portion projects from the base portion in the same direction as the support shaft and has a tip. A stopper portion provided with a hit portion on which the contact portion can come into contact, and a side wall of the stopper portion when viewed from the axial direction at the root portion of the stopper portion on the base portion side from the hit portion. A reinforcing portion formed of a portion protruding outward from the base portion is provided, and an end portion of the side surface of the reinforcing portion opposite to the base portion is continuous with the side wall of the stopper portion, and the end portion on the base portion side is provided. Is continuous to the base portion, the entire side surface of the reinforcing portion is formed as a concave curved surface or an inclined surface, and the reinforcing portion has a diameter protruding inward in the radial direction from the stopper portion where the support shaft is located. The stopper portion is formed on the entire circumference including the directional inner reinforcing portion, and the radial inner reinforcing portion is a dimension in the axial direction of the reinforcing portion other than the radial inner reinforcing portion. Is small. According to the present invention, it is possible to avoid interference between the radial inner reinforcing portion and the gear according to such an aspect.

この場合、前記補強部は、側面全体が凹曲面になっていることにより、前記補強部の前記ベース部とは反対側の端部が前記ストッパ部の前記側壁になめらかに連続し、前記ベース部側の端部が前記ベース部になめらかに連続していることが好ましい。 In this case, since the entire side surface of the reinforcing portion is a concave curved surface, the end portion of the reinforcing portion on the side opposite to the base portion smoothly continues to the side wall of the stopper portion, and the base portion It is preferable that the end portion on the side is smoothly continuous with the base portion.

本発明において、前記軸線方向からみたとき、前記補強部の外縁は、折れ曲がった個所が曲線からなる態様を採用することができる。かかる態様によれば、補強部の特定個所への応力の集中を緩和できる。従って、回転規制部が損傷することを防止できる。 In the present invention, when viewed from the axial direction, the outer edge of the reinforcing portion may adopt a mode in which the bent portion is a curved portion. According to this aspect, the concentration of stress on the specific portion of the reinforcing portion can be relaxed. Therefore, it is possible to prevent the rotation restricting portion from being damaged.

本発明において、前記歯車は、前記支軸が挿入される筒部と、前記筒部から外周側に突出した突出部と、を備え、前記突出部の外周面には、歯部が設けられており、前記突出部の前記ベース部と対向する対向面には、前記軸線回りの周方向に延びる溝部が設けられており、前記ストッパ部は、前記補強部より先端側が前記溝部に挿入され、前記当接部は、前記溝部の内壁面のうち前記周方向の端を規定している壁面部分である態様を採用することができる。 In the present invention, the gear includes a tubular portion into which the support shaft is inserted and a protruding portion protruding from the tubular portion to the outer peripheral side, and a tooth portion is provided on the outer peripheral surface of the protruding portion. A groove portion extending in the circumferential direction around the axis is provided on the facing surface of the protruding portion facing the base portion, and the stopper portion is inserted into the groove portion at the tip end side of the reinforcing portion. As the abutting portion, it is possible to adopt an aspect in which the inner wall surface of the groove portion is a wall surface portion that defines the end in the circumferential direction.

本発明において、前記軸線方向からみたとき、前記ストッパ部は、前記支軸周りの周方向に延在している態様を採用することができる。 In the present invention, when viewed from the axial direction, the stopper portion may extend in the circumferential direction around the support shaft.

この場合、前記ストッパ部は、前記側壁のうち、前記支軸の側に位置する内周部分が前記軸線を中心とする円弧面になっている態様を採用することができる。
本発明において、前記支持部材は、前記歯車を収容するケースであり、前記ケースの底板部によって前記ベース部が構成されている態様を採用することができる。 In this case, the stopper portion may adopt a mode in which the inner peripheral portion of the side wall located on the side of the support shaft is an arc surface centered on the axis.
In the present invention, the support member is a case for accommodating the gear, and an embodiment in which the base portion is formed by the bottom plate portion of the case can be adopted.

次に、本発明のギアユニットは、支持部材のベース部から突出した支軸と、前記支軸によって回転可能に支持され、駆動源からの駆動力が伝達される歯車と、前記歯車が前記支軸の軸線回りを回転する角度範囲を規定する回転規制機構と、を有し、前記回転規制機構は、前記歯車において前記軸線から外周側に離間する位置に設けられた当接部と、前記当接部に前記歯車の回転方向の前方から当接可能に前記支持部材に設けられた回転規制部と、を備え、前記回転規制部は、前記ベース部から前記支軸と同一方向に突出して先端側に前記当接部が当接可能な度当たり部分を備えたストッパ部と、前記ストッパ部において前記度当たり部分より前記ベース部側の根元部分で前記軸線方向からみたときに前記ストッパ部の側壁から外側に張り出した部分からなる補強部と、を備え、前記補強部の側面は、前記ベース部とは反対側の端部が前記ストッパ部の前記側壁に連続し、前記ベース部側の端部が前記ベース部に連続しており、前記支持部材は、前記歯車を収容するケースであり、前記ケースの底板部によって前記ベース部が構成されており、前記駆動源として前記ケースに収容されたモータと、前記モータに電力を供給するための給電ケーブルと、前記歯車と噛み合って前記モータの駆動力を前記歯車に伝達する伝達歯車と、前記底板部から前記支軸と同一方向に突出して前記伝達歯車を回転可能に支持する伝達歯車用支軸と、を有し、前記底板部は、前記支軸と同一方向に突出して前記給電ケーブルを前記前記ケース内で案内する案内壁を備え、前記回転規制部は、前記支軸の軸線回りで前記伝達歯車用支軸と前記案内壁との間の角度範囲に設けられており、前記補強部は、前記案内壁に連続し、前記案内壁は、前記回転規制部とは反対の側に位置する案内面で前記給電ケーブルを案内することを特徴とする。Next, in the gear unit of the present invention, a support shaft protruding from the base portion of the support member, a gear rotatably supported by the support shaft, and a driving force from a drive source is transmitted, and the gear supports the support. It has a rotation regulating mechanism that defines an angle range for rotating around the axis of the shaft, and the rotation regulating mechanism has a contact portion provided at a position separated from the axis on the outer peripheral side of the gear, and the contact portion. The contact portion is provided with a rotation restricting portion provided on the support member so as to be able to come into contact with the gear from the front in the rotation direction of the gear, and the rotation regulating portion projects from the base portion in the same direction as the support shaft and has a tip. A stopper portion provided with a hit portion on which the contact portion can come into contact, and a side wall of the stopper portion when viewed from the axial direction at the root portion of the stopper portion on the base portion side from the hit portion. The side surface of the reinforcing portion includes a reinforcing portion formed of a portion protruding outward from the base portion, and an end portion on the side opposite to the base portion is continuous with the side wall of the stopper portion, and the end portion on the base portion side is provided. Is continuous with the base portion, the support member is a case for accommodating the gear, the base portion is formed by the bottom plate portion of the case, and the motor accommodated in the case as the drive source. A power supply cable for supplying power to the motor, a transmission gear that meshes with the gear and transmits the driving force of the motor to the gear, and the transmission that protrudes from the bottom plate portion in the same direction as the support shaft. A support shaft for a transmission gear that rotatably supports the gear, and the bottom plate portion includes a guide wall that projects in the same direction as the support shaft and guides the power supply cable in the case, and the rotation. The restricting portion is provided in an angular range between the transmission gear support shaft and the guide wall around the axis of the support shaft, the reinforcing portion is continuous with the guide wall, and the guide wall is connected to the guide wall. The power feeding cable is guided by a guide surface located on the side opposite to the rotation restricting portion.

本発明によれば、ケース内において、給電ケーブルを歯車等と干渉しない領域で引き回すことが容易となる。また、伝達歯車と回転規制部とを互いに干渉しない位置に配置することが容易となる。さらに、案内壁と補強部とが連続するので、案内壁の剛性が向上する。According to the present invention, it becomes easy to route the power supply cable in a region that does not interfere with gears or the like in the case. Further, it becomes easy to arrange the transmission gear and the rotation restricting portion at positions where they do not interfere with each other. Further, since the guide wall and the reinforcing portion are continuous, the rigidity of the guide wall is improved.

本発明において、前記ケースは、前記支軸および前記回転規制部も含めて樹脂による一体成型品である態様を採用することができる。かかる態様によれば、各々が別の部材とされた場合と比較して、部品点数を抑制できる。また、回転規制部（ストッパ部および補強部）が一体なので、ストッパ部と補強部との間の強度を確保しやすい。In the present invention, the case can adopt an aspect in which the case is an integrally molded product made of resin including the support shaft and the rotation restricting portion. According to such an aspect, the number of parts can be suppressed as compared with the case where each member is a separate member. Further, since the rotation regulating portion (stopper portion and reinforcing portion) is integrated, it is easy to secure the strength between the stopper portion and the reinforcing portion.

本発明に係るギアユニットは冷気ダンパに用いることができる。この場合、冷気ダンパは、開口部が形成されたフレームと、前記開口部を開閉するためのバッフルと、前記歯車と噛み合う出力歯車と、を有し、前記バッフルは、前記出力歯車に連結されており、前記モータの駆動によって前記バッフルが駆動される。かかる態様によれば、回転規制機構により、出力歯車の前段の歯車の回転角度範囲が規定される。従って、出力歯車が回転する角度範囲を精度よく規定できる。また、ギアユニットが、モータの駆動力を伝達する歯車の回転角度範囲を規定する回転規制機構を備えるので、歯車と噛合する出力歯車に連結されたバッフルの回転角度範囲を規定できる。また、回転規制機構において歯車の当接部と当接して前記歯車の回転を規制する回転規制部が補強部を備えるので、バッフルの回転角度範囲を規定する毎に歯車の当接部と回転規制部とが衝突して回転規制部の基端側に応力が発生する場合でも、回転規制部が損傷することを防止あるいは抑制できる。 The gear unit according to the present invention can be used as a cold air damper. In this case, the cold air damper has a frame having an opening, a baffle for opening and closing the opening, and an output gear that meshes with the gear, and the baffle is connected to the output gear. The baffle is driven by the drive of the motor. According to this aspect, the rotation regulation mechanism defines the rotation angle range of the gear in the front stage of the output gear. Therefore, the angle range in which the output gear rotates can be accurately defined. Further, since the gear unit includes a rotation regulation mechanism that defines the rotation angle range of the gear that transmits the driving force of the motor, the rotation angle range of the baffle connected to the output gear that meshes with the gear can be specified. Further, in the rotation regulation mechanism, the rotation regulation portion that contacts the contact portion of the gear and regulates the rotation of the gear is provided with a reinforcing portion, so that the contact portion of the gear and the rotation regulation are regulated every time the rotation angle range of the baffle is specified. Even when a stress is generated on the base end side of the rotation restricting portion due to a collision with the portion, it is possible to prevent or suppress damage to the rotation regulating portion.

本発明において、前記歯車は、軸線方向の異なる位置に、前記第２の歯車が噛合する第１歯部を有する平歯車と、前記出力歯車が噛合する第２歯部を有する欠歯歯車と、を同軸に備える複合歯車であり、前記出力歯車は、扇形歯車であり、前記欠歯歯車は、その第２歯部に周方向で隣り合う位置に前記第２歯部の歯先円よりも外周側で前記歯先円に沿って湾曲する外周面を備える外周部を備え、前記外周部は、前記軸線方向の長さが前記第２歯部の歯幅よりも短く、前記軸線方向における前記第２歯部の途中の位置に前記軸線方向の一方側を向く端面を備え、前記扇形歯車は、前記外周面に対向する部分が切り欠かれており前記端面における前記軸線方向の一方側で前記歯先円の内周側に進入可能な第１歯と、前記第１歯の隣に位置して前記第１歯が前記歯先円の内周側に進入したときに前記外周面に当接可能な第２歯と、を備え、前記バッフルが前記開口部を閉じる閉位置に配置されたときに、前記第１歯が前記端面における前記軸線方向の一方側で前記歯先円の内周側に進入し前記第２歯が前記外周面に当接して前記扇形歯車が前記バッフルを開く方向に回転することが阻止されることが望ましい。このようにすれば、閉位置に配置されたバッフルが、動いてしまうことを防止できる。 In the present invention, the gear includes a spur gear having a first tooth portion with which the second gear meshes and a missing tooth gear having a second tooth portion with which the output gear meshes at different positions in the axial direction. The output gear is a fan-shaped gear, and the missing tooth gear is located adjacent to the second tooth portion in the circumferential direction on the outer periphery of the tip circle of the second tooth portion. The outer peripheral portion includes an outer peripheral portion having an outer peripheral surface curved along the tip circle on the side, and the outer peripheral portion has a length in the axial direction shorter than the tooth width of the second tooth portion, and the outer peripheral portion has the first in the axial direction. The fan-shaped gear is provided with an end face facing one side in the axial direction at a position in the middle of the two tooth portions, and the portion of the fan-shaped gear facing the outer peripheral surface is cut out so that the tooth is on one side in the axial direction on the end face. The first tooth that can enter the inner peripheral side of the tip circle and the first tooth that is located next to the first tooth and can come into contact with the outer peripheral surface when the first tooth enters the inner peripheral side of the tip circle. When the baffle is arranged in a closed position to close the opening, the first tooth is on one side of the end face in the axial direction and on the inner peripheral side of the tip circle. It is desirable that the second tooth enters and abuts on the outer peripheral surface to prevent the fan-shaped gear from rotating in the direction of opening the baffle. In this way, it is possible to prevent the baffle arranged in the closed position from moving.

この場合において、前記バッフルは、前記開口部を封鎖する弾性部材を備え、前記弾性部材は、前記バッフルが前記閉位置に配置されたときに、前記フレームにおける前記開口部の開口縁に当接して弾性変形することが望ましい。このようにすれば、バッフルによって開口部を確実に閉鎖できる。ここで、弾性変形した弾性部材の形状復帰力は、バッフルを開く方向に扇形歯車を回転させる力として作用するが、バッフルが閉位置に配置されたときに扇形歯車（出力歯車）はバッフルを開く方向に回転することが阻止されている。従って、弾性部材の形状復帰力によってバッフルが閉位置から開口部を開く方向に移動することがない。 In this case, the baffle includes an elastic member that closes the opening, and the elastic member comes into contact with the opening edge of the opening in the frame when the baffle is placed in the closed position. It is desirable to elastically deform. In this way, the baffle can reliably close the opening. Here, the shape-returning force of the elastically deformed elastic member acts as a force for rotating the fan-shaped gear in the direction of opening the baffle, but the fan-shaped gear (output gear) opens the baffle when the baffle is placed in the closed position. It is blocked from rotating in the direction. Therefore, the baffle does not move from the closed position in the direction of opening the opening due to the shape restoring force of the elastic member.

本発明では、回転規制部が、ベース部から突出して先端部分に歯車の当接部に当接可能
な度当たり部分を備えるストッパ部と、ストッパ部から外側に張り出す補強部とを備える。ここで、補強部は、ベース部とは反対側の端部がストッパ部の前記側壁に連続し、ベース部側の端部がベース部に連続しているので、歯車の回転を規制する毎に歯車の当接部とストッパ部の度当たり部分とが衝突してストッパ部の基端部分（根元部分）に応力が頻繁に発生する場合でも、補強部によって、回転規制部に亀裂などの破損が発生することを防止或いは抑制できる。また、補強部は、ストッパ部の根元部分に設けられているため、補強部と歯車の当接部とが干渉することがない。さらに、本発明によれば、補強部をストッパ部の先端側まで設けることができるので、回転規制部が損傷することを防止できる。あるいは、径方向内側補強部と歯車との干渉を回避することができる。あるいは、給電ケーブルを歯車等と干渉しない領域で引き回すこと、および、伝達歯車と回転規制部とを互いに干渉しない位置に配置することが容易であるとともに、案内壁の剛性が向上する。 In the present invention, the rotation restricting portion includes a stopper portion that protrudes from the base portion and has a perforated portion that can come into contact with the contact portion of the gear at the tip portion, and a reinforcing portion that projects outward from the stopper portion. Here, in the reinforcing portion, the end portion on the side opposite to the base portion is continuous with the side wall of the stopper portion, and the end portion on the base portion side is continuous with the base portion. Even if the contact part of the gear collides with the perforated part of the stopper part and stress is frequently generated at the base end part (root part) of the stopper part, the reinforcing part causes damage such as cracks in the rotation restricting part. It can be prevented or suppressed from occurring. Further, since the reinforcing portion is provided at the base portion of the stopper portion, the reinforcing portion and the contact portion of the gear do not interfere with each other. Further, according to the present invention, since the reinforcing portion can be provided up to the tip end side of the stopper portion, it is possible to prevent the rotation restricting portion from being damaged. Alternatively, it is possible to avoid interference between the radial inner reinforcing portion and the gear. Alternatively, it is easy to route the power supply cable in a region that does not interfere with the gears and the like, and to arrange the transmission gear and the rotation restricting portion at positions that do not interfere with each other, and the rigidity of the guide wall is improved.

本発明の実施の形態１に係る冷気ダンパをバッフルが配置されている側からみた斜視図である。It is a perspective view which looked at the cold air damper which concerns on Embodiment 1 of this invention from the side where the baffle is arranged. 図１に示す冷気ダンパの分解斜視図である。It is an exploded perspective view of the cold air damper shown in FIG. 本発明の実施の形態１に係るギアユニットから蓋を取り除いた様子をＸ方向の第１方向から見た場合の平面図である。FIG. 5 is a plan view of the state in which the lid is removed from the gear unit according to the first embodiment of the present invention when viewed from the first direction in the X direction. 図３に示すギアユニットの分解斜視図である。It is an exploded perspective view of the gear unit shown in FIG. 図３に示すギアユニットのケースをＸ方向の第１方向から見た場合の平面図である。FIG. 3 is a plan view of the case of the gear unit shown in FIG. 3 when viewed from the first direction in the X direction. 図４等に示す駆動歯車と出力歯車との噛み合い状態を示す説明図である。It is explanatory drawing which shows the meshing state of the drive gear and the output gear shown in FIG. 4 and the like. 図６等に示す駆動歯車の説明図である。It is explanatory drawing of the drive gear shown in FIG. 6 and the like. 図５に示すケースにおいて駆動歯車が載置される台座部分の周辺部分を拡大した部分拡大図である。FIG. 5 is an enlarged partial enlarged view of a peripheral portion of a pedestal portion on which a drive gear is placed in the case shown in FIG. 図８に示す回転規制部を第２支軸が設けられている側からみたときの斜視図である。It is a perspective view when the rotation regulation part shown in FIG. 8 is seen from the side where the 2nd support shaft is provided. 図８に示す回転規制部を案内壁が設けられている側からみたときの斜視図である。It is a perspective view when the rotation regulation part shown in FIG. 8 is seen from the side where the guide wall is provided. 図６に示す出力歯車の斜視図である。It is a perspective view of the output gear shown in FIG. 図１に示すダンパ装置において、バッフルが閉位置にあるときの駆動歯車および出力歯車の平面図である。FIG. 5 is a plan view of a drive gear and an output gear when the baffle is in the closed position in the damper device shown in FIG. 図１に示す冷気ダンパによる開口部の開閉動作の説明図である。It is explanatory drawing of the opening and closing operation of the opening by the cold air damper shown in FIG. 図１に示す冷気ダンパによる開口部の開閉動作の説明図である。It is explanatory drawing of the opening and closing operation of the opening by the cold air damper shown in FIG. 本発明の実施の形態２に係るギアユニットの説明図である。It is explanatory drawing of the gear unit which concerns on Embodiment 2 of this invention. 図１５に示す第２駆動歯車に対する回転規制部等の説明図である。It is explanatory drawing of the rotation regulation part and the like with respect to the 2nd drive gear shown in FIG. 図１５に示す第２駆動歯車をＸ方向の第２方向からみた斜視図である。FIG. 15 is a perspective view of the second drive gear shown in FIG. 15 as viewed from the second direction in the X direction. 図１５に示すケースの平面図である。It is a top view of the case shown in FIG. 本発明の実施の形態２の変形例１に係るギアユニットに設けた回転規制部の平面図である。It is a top view of the rotation regulation part provided in the gear unit which concerns on the modification 1 of Embodiment 2 of this invention. 本発明の実施の形態２の変形例２に係るギアユニットに設けた回転規制部の平面図である。It is a top view of the rotation regulation part provided in the gear unit which concerns on the modification 2 of Embodiment 2 of this invention.

以下、図面を参照して、本発明を適用した冷蔵庫用の冷気ダンパについて説明する。 Hereinafter, a cold air damper for a refrigerator to which the present invention is applied will be described with reference to the drawings.

［実施の形態１］
（全体構成）
図１は、本発明の実施の形態１に係る冷気ダンパをバッフルが配置されている側からみた斜視図である。図１（ａ）は開口部が開いている状態であり、図１（ｂ）は開口部が閉じている状態である。図２は、図１に示す冷気ダンパの分解斜視図である。以下の説明で
は、冷気ダンパ１におけるバッフル２の回転中心軸線Ｌ０に沿う方向をＸ方向し、Ｘ方向と直交してバッフル２により開閉される開口部３が向いている方向をＺ方向とし、Ｘ方向およびＺ方向に直交する方向をＹ方向とする。また、Ｘ方向の一方側をＸ方向の第１方向Ｘ１とし、Ｘ方向の第１方向Ｘ１とは反対側をＸ方向の第２方向Ｘ２とし、Ｙ方向の一方側を第１方向Ｙ１とし、第１方向Ｙ１とは反対側を第２方向Ｙ２とし、Ｚ方向の一方側を第１方向Ｚ１とし、第１方向Ｚ１の反対側を第２方向Ｚ２とする。 [Embodiment 1]
(overall structure)
FIG. 1 is a perspective view of the cold air damper according to the first embodiment of the present invention as viewed from the side where the baffle is arranged. FIG. 1A shows a state in which the opening is open, and FIG. 1B shows a state in which the opening is closed. FIG. 2 is an exploded perspective view of the cold air damper shown in FIG. In the following description, the direction along the rotation center axis L0 of the baffle 2 in the cold air damper 1 is the X direction, and the direction in which the opening 3 opened and closed by the baffle 2 is oriented orthogonal to the X direction is the Z direction. The direction orthogonal to the direction and the Z direction is defined as the Y direction. Further, one side in the X direction is set as the first direction X1 in the X direction, the side opposite to the first direction X1 in the X direction is set as the second direction X2 in the X direction, and one side in the Y direction is set as the first direction Y1. The side opposite to the first direction Y1 is the second direction Y2, one side in the Z direction is the first direction Z1, and the opposite side of the first direction Z1 is the second direction Z2.

図１（ａ）に示すように、冷気ダンパ１は、Ｚ方向に開口する矩形の開口部３を備えるフレーム５と、フレーム５の開口部３を開閉するバッフル２を備える。また、冷気ダンパ１は、図２に示すように、バッフル２を駆動する駆動機構６を備える。駆動機構６は、フレーム５のＸ方向の第２方向Ｘ２にフレーム５と一体に設けられた蓋７と、蓋７にＸ方向の第２方向Ｘ２から被せられたケース８により区画された駆動室９に収納されている。ケース８、蓋７および駆動機構６はギアユニット１０を構成する。フレーム５、蓋７およびケース８は樹脂製である。 As shown in FIG. 1A, the cold air damper 1 includes a frame 5 having a rectangular opening 3 that opens in the Z direction, and a baffle 2 that opens and closes the opening 3 of the frame 5. Further, as shown in FIG. 2, the cold air damper 1 includes a drive mechanism 6 for driving the baffle 2. The drive mechanism 6 is a drive chamber partitioned by a lid 7 integrally provided with the frame 5 in the second direction X2 in the X direction of the frame 5 and a case 8 covering the lid 7 from the second direction X2 in the X direction. It is stored in 9. The case 8, the lid 7, and the drive mechanism 6 constitute the gear unit 10. The frame 5, lid 7 and case 8 are made of resin.

フレーム５は、図１（ａ）に示すように、開口部３が形成された矩形の端板部１２と、端板部１２の外縁から第２方向Ｚ２に突出した角筒状の胴部１３を有する。蓋７は、胴部１３のＸ方向の第２方向Ｘ２に胴部１３と一体に設けられている。端板部１２における開口部３の縁（開口縁）には、バッフル２が位置する側に向けて突出した角筒状のシール板部１４が設けられている。 As shown in FIG. 1A, the frame 5 has a rectangular end plate portion 12 having an opening 3 formed therein and a square tubular body portion 13 projecting from the outer edge of the end plate portion 12 in the second direction Z2. Has. The lid 7 is provided integrally with the body portion 13 in the second direction X2 in the X direction of the body portion 13. At the edge (opening edge) of the opening 3 in the end plate portion 12, a square tubular seal plate portion 14 projecting toward the side where the baffle 2 is located is provided.

ここで、バッフル２が開口部３を開く開位置２Ａに配置された状態は、図１（ａ）に示す状態であり、バッフル２は端板部１２と直交する姿勢となる。バッフル２が開口部３を閉じる閉位置２Ｂに配置された状態は、図１（ｂ）に示す状態であり、バッフル２は端板部１２と平行に延びる姿勢となる。バッフル２は閉位置２Ｂと開位置２Ａとの間を９０°の角度範囲で回動する。 Here, the state in which the baffle 2 is arranged at the open position 2A that opens the opening 3 is the state shown in FIG. 1A, and the baffle 2 is in a posture orthogonal to the end plate portion 12. The state in which the baffle 2 is arranged at the closed position 2B that closes the opening 3 is the state shown in FIG. 1 (b), and the baffle 2 is in a posture extending in parallel with the end plate portion 12. The baffle 2 rotates between the closed position 2B and the open position 2A within an angle range of 90 °.

バッフル２は、第２方向Ｚ２からシール板部１４に当接して開口部３を閉状態とする。端板部１２におけるバッフル２が位置する側の面には、開口部３（シール板部１４）を囲む状態にヒータ１５が取り付けられている。 The baffle 2 abuts on the seal plate portion 14 from the second direction Z2 to close the opening 3. A heater 15 is attached to the surface of the end plate portion 12 on the side where the baffle 2 is located so as to surround the opening 3 (seal plate portion 14).

バッフル２は、開口部３よりも大きい矩形の平板部１８を備える開閉板１９と、平板部１８の開口部３の側の面に貼り付けられた矩形の弾性部材２０を有する。弾性部材２０は、シート状であり、発泡ポリウレタン等からなる。弾性部材２０は、バッフル２が閉位置２Ｂに配置されたときに、シール板部１４に当接して開口部３を封鎖する。また、弾性部材２０は、バッフル２が閉位置２Ｂに配置されたときに、シール板部１４に当接して、弾性変形する。 The baffle 2 has an opening / closing plate 19 having a rectangular flat plate portion 18 larger than the opening 3, and a rectangular elastic member 20 attached to the surface of the flat plate portion 18 on the side of the opening 3. The elastic member 20 has a sheet shape and is made of foamed polyurethane or the like. When the baffle 2 is arranged at the closed position 2B, the elastic member 20 comes into contact with the seal plate portion 14 to close the opening 3. Further, when the baffle 2 is arranged at the closed position 2B, the elastic member 20 comes into contact with the seal plate portion 14 and elastically deforms.

図２に示すように、バッフル２は、Ｙ方向の第１方向Ｙ１の端部分におけるＸ方向の第２方向Ｘ２の端部分に、駆動機構６の出力軸６ａが挿入された第１軸部２１を備える。さらに、バッフル２は、Ｙ方向の第１方向Ｙ１の端部分におけるＸ方向の第１方向Ｘ１の端部分に、胴部１３に回転可能に支持された第２軸部２２を備える。駆動機構６が駆動されると、バッフル２は、第１軸部２１および第２軸部２２と同軸の回転中心軸線Ｌ０回りに回転して開口部３を開閉する。 As shown in FIG. 2, the baffle 2 has a first shaft portion 21 in which the output shaft 6a of the drive mechanism 6 is inserted into the end portion of the second direction X2 in the X direction at the end portion of the first direction Y1 in the Y direction. To be equipped. Further, the baffle 2 includes a second shaft portion 22 rotatably supported by the body portion 13 at the end portion of the first direction X1 in the X direction at the end portion of the first direction Y1 in the Y direction. When the drive mechanism 6 is driven, the baffle 2 rotates around the rotation center axis L0 coaxial with the first shaft portion 21 and the second shaft portion 22 to open and close the opening 3.

冷気ダンパ１は、冷蔵庫の冷気通路を構成するダクトの内側に配置される。冷気は、開口部３に対してバッフル２が配置されている側とは反対から開口部３を通って流れる。あるいは、開口部３に対してバッフル２が配置されている側から開口部３を通って流れる。 The cold air damper 1 is arranged inside a duct constituting the cold air passage of the refrigerator. Cold air flows through the opening 3 from the side opposite to the side where the baffle 2 is arranged with respect to the opening 3. Alternatively, it flows through the opening 3 from the side where the baffle 2 is arranged with respect to the opening 3.

（ギアユニットの構成）
図３は、本発明の実施の形態１に係るギアユニット１０から蓋７を取り除いた様子をＸ方向の第１方向Ｘ１から見た場合の平面図である。図４は、図３に示すギアユニット１０の分解斜視図である。図５は、図３に示すギアユニット１０のケース８をＸ方向の第１方向Ｘ１から見た場合の平面図である。図３、図４および図５に示すように、ギアユニット１０のケース８はＹ方向およびＺ方向に広がる底板部２５と、底板部２５から蓋７の側（Ｘ方向の第１方向Ｘ１）に突出した角筒状のケース胴部２６を有している。ケース８は、本発明における「支持部材」に相当し、底板部２５は本発明における「ベース部」に相当する。 (Gear unit configuration)
FIG. 3 is a plan view of the state in which the lid 7 is removed from the gear unit 10 according to the first embodiment of the present invention as viewed from the first direction X1 in the X direction. FIG. 4 is an exploded perspective view of the gear unit 10 shown in FIG. FIG. 5 is a plan view of the case 8 of the gear unit 10 shown in FIG. 3 when viewed from the first direction X1 in the X direction. As shown in FIGS. 3, 4 and 5, the case 8 of the gear unit 10 has a bottom plate portion 25 extending in the Y direction and the Z direction, and the bottom plate portion 25 toward the lid 7 side (first direction X1 in the X direction). It has a protruding square tubular case body 26. The case 8 corresponds to the "support member" in the present invention, and the bottom plate portion 25 corresponds to the "base portion" in the present invention.

駆動機構６はケース８に収納されている。駆動機構６は、駆動源としてのモータ３１と、モータ３１の回転をバッフル２に伝達する輪列３２を備える。モータ３１はステッピングモータであり、その出力軸３１ａがＸ方向の第１方向Ｘ１に向く姿勢とされている。モータ３１は、ケース８におけるＹ方向の第２方向Ｙ２の端側部分に配置されている。モータ３１の出力軸３１ａにはピニオン３３が取り付けられている。 The drive mechanism 6 is housed in the case 8. The drive mechanism 6 includes a motor 31 as a drive source and a train wheel 32 that transmits the rotation of the motor 31 to the baffle 2. The motor 31 is a stepping motor, and its output shaft 31a is oriented toward the first direction X1 in the X direction. The motor 31 is arranged at the end side portion of the case 8 in the second direction Y2 in the Y direction. A pinion 33 is attached to the output shaft 31a of the motor 31.

輪列３２は、ピニオン３３と、ピニオン３３に噛合する大径歯車を備える第１歯車３４と、第１歯車３４の小径歯車（不図示）に噛合する大径歯車を備える第２歯車（第２の歯車）３５と、第２歯車３５の小径歯車に噛合する駆動歯車（歯車）３６を有する。輪列３２において、第１歯車３４、第２歯車３５および駆動歯車３６は減速輪列を構成する。駆動歯車３６は、第２歯車３５の小径歯車に噛合する大径歯車（平歯車）３７と、大径歯車３７のＸ方向の第１方向Ｘ１に大径歯車３７と一体で同心に設けられた欠歯歯車３８を備える複合歯車である。駆動歯車３６は、本発明における「歯車」に相当し、第２歯車３５は、駆動歯車３６に駆動力を伝達する歯車であり、本発明における「伝達歯車」に相当する。 The train wheel 32 includes a pinion 33, a first gear 34 having a large-diameter gear that meshes with the pinion 33, and a second gear (second gear) having a large-diameter gear that meshes with a small-diameter gear (not shown) of the first gear 34. Gear) 35 and a drive gear (gear) 36 that meshes with the small diameter gear of the second gear 35. In the train wheel 32, the first gear 34, the second gear 35, and the drive gear 36 form a reduction wheel train. The drive gear 36 is provided concentrically with the large-diameter gear (spur gear) 37 that meshes with the small-diameter gear of the second gear 35 and the large-diameter gear 37 in the first direction X1 in the X direction of the large-diameter gear 37. It is a composite gear including a missing tooth gear 38. The drive gear 36 corresponds to the "gear" in the present invention, and the second gear 35 is a gear that transmits a driving force to the drive gear 36, and corresponds to the "transmission gear" in the present invention.

第１歯車３４は蓋７からＸ方向の第２方向Ｘ２に突出する第１支軸（不図示）に回転可能に支持されている。図４および図５に示すように、第２歯車３５はケース８の底板部２５からＸ方向の第１方向Ｘ１に突出する第２支軸（伝達歯車用支軸）４１に回転可能に支持されている。底板部２５は、Ｘ方向の第１方向Ｘ１に段状に突出した台座部分４２を有している。駆動歯車３６はケース８の底板部２５からＸ方向の第１方向Ｘ１に突出する台座部分４２に載置され、台座部分４２からＸ方向の第１方向Ｘ１に突出する第３支軸（支軸）４３に回転可能に支持されている。台座部分４２のＸ方向の第１方向Ｘ１の端面の一部は、駆動歯車３６を載置する載置面４２ａであり、Ｘ方向と直交する平面である。駆動歯車３６は第３支軸４３の軸線Ｌ１回りに回転する。従って、第３支軸４３の軸線Ｌ１は駆動歯車３６の回転中心線である。 The first gear 34 is rotatably supported by a first support shaft (not shown) protruding from the lid 7 in the second direction X2 in the X direction. As shown in FIGS. 4 and 5, the second gear 35 is rotatably supported by a second support shaft (support shaft for transmission gear) 41 protruding from the bottom plate portion 25 of the case 8 in the first direction X1 in the X direction. ing. The bottom plate portion 25 has a pedestal portion 42 that projects stepwise in the first direction X1 in the X direction. The drive gear 36 is mounted on a pedestal portion 42 protruding from the bottom plate portion 25 of the case 8 in the first direction X1 in the X direction, and a third support shaft (support shaft) protruding from the pedestal portion 42 in the first direction X1 in the X direction. ) 43 is rotatably supported. A part of the end surface of the pedestal portion 42 in the first direction X1 in the X direction is a mounting surface 42a on which the drive gear 36 is mounted, and is a plane orthogonal to the X direction. The drive gear 36 rotates around the axis L1 of the third support shaft 43. Therefore, the axis L1 of the third support shaft 43 is the rotation center line of the drive gear 36.

また、輪列３２は、駆動歯車３６の欠歯歯車３８と噛合して駆動歯車３６に従動する出力歯車３９を有する。出力歯車３９は扇形歯車であり、バッフル２に連結される出力軸６ａを備える。出力歯車３９はケース８の底板部２５からＸ方向の第１方向Ｘ１に突出する軸受用筒部４４に回転可能に支持されている。出力歯車３９は軸受用筒部４４の軸線Ｌ２回りに回転する。軸受用筒部４４の軸線Ｌ２は出力歯車３９の回転中心線であり、バッフル２の回転中心軸線Ｌ０である。輪列３２を構成する各歯車は樹脂成型品である。また、ケースは樹脂による一体成型品である。 Further, the train wheel 32 has an output gear 39 that meshes with the missing tooth gear 38 of the drive gear 36 to drive the drive gear 36. The output gear 39 is a fan-shaped gear and includes an output shaft 6a connected to the baffle 2. The output gear 39 is rotatably supported by a bearing cylinder 44 protruding from the bottom plate 25 of the case 8 in the first direction X1 in the X direction. The output gear 39 rotates around the axis L2 of the bearing cylinder 44. The axis L2 of the bearing cylinder 44 is the rotation center line of the output gear 39, and is the rotation center axis L0 of the baffle 2. Each gear constituting the train wheel 32 is a resin molded product. The case is an integrally molded product made of resin.

ここで、図３に示すように、ケース８内には、モータ３１への給電を行うための給電ケーブル４５が引き回されている。 Here, as shown in FIG. 3, a power supply cable 45 for supplying power to the motor 31 is routed in the case 8.

具体的には、図４および図５に示すように、ケース胴部２６においてＺ方向の第２方向Ｘ２の端でＹ方向に延びる胴部部分２６ａには、Ｙ方向の第１方向Ｙ１の端部分に、給電ケーブル４５を外部からケース８内に引き込むための引込口４６が設けられている。引込
口４６は胴部部分２６ａをＸ方向の第１方向Ｘ１から切り欠いて設けた切欠き部である。また、ケース８内には、底板部２５からＸ方向の第１方向Ｘ１に突出するとともに、引込口４６からモータ３１に向かってＹ方向に延びる案内壁４７が設けられている。案内壁４７はケース胴部２６の胴部部分２６ａと第３支軸４３との間に位置する。案内壁４７は、ケース胴部２６の胴部部分２６ａと隙間を開けて対向しており、案内壁４７と胴部部分２６ａとの間はケーブル通路４８となっている。給電ケーブル４５は、引込口４６からケース８内に導入された後に、ケーブル通路４８に沿って引き出されて、モータ３１に接続される。案内壁４７は、第３支軸４３とは反対側に位置する案内面４７ａで給電ケーブル４５を案内する。 Specifically, as shown in FIGS. 4 and 5, the body portion 26a extending in the Y direction at the end of the case body 26 in the second direction X2 in the Z direction has an end in the first direction Y1 in the Y direction. A lead-in port 46 for pulling the power supply cable 45 into the case 8 from the outside is provided in the portion. The entrance 46 is a notch portion provided by notching the body portion 26a from the first direction X1 in the X direction. Further, in the case 8, a guide wall 47 is provided which projects from the bottom plate portion 25 in the first direction X1 in the X direction and extends in the Y direction from the inlet 46 toward the motor 31. The guide wall 47 is located between the body portion 26a of the case body 26 and the third support shaft 43. The guide wall 47 faces the body portion 26a of the case body portion 26 with a gap, and a cable passage 48 is formed between the guide wall 47 and the body portion 26a. After being introduced into the case 8 from the inlet 46, the power supply cable 45 is pulled out along the cable passage 48 and connected to the motor 31. The guide wall 47 guides the power supply cable 45 on a guide surface 47a located on the side opposite to the third support shaft 43.

（駆動歯車３６および回転規制機構５０の構成）
図６は、図４等に示す駆動歯車３６と出力歯車３９との噛み合い状態を示す説明図である。図６（ａ）は駆動歯車３６および出力歯車３９を駆動歯車３６の欠歯歯車３８の側（Ｘ方向の第１方向Ｘ１）から見た場合の斜視図であり、図６（ｂ）は駆動歯車３６および出力歯車３９を駆動歯車３６の大径歯車３７の側（Ｘ方向の第２方向Ｘ２）から見た場合の斜視図である。図７は、図６等に示す駆動歯車３６の説明図である。図７（ａ）は駆動歯車３６を欠歯歯車３８（Ｘ方向の第１方向Ｘ１）の側から見た場合の斜視図であり、図７（ｂ）は駆動歯車３６をその回転中心線（軸線Ｌ１）と直交する方向から見た場合の側面図であり、図７（ｃ）は駆動歯車３６を大径歯車３７（Ｘ方向の第２方向Ｘ２）の側から見た場合の平面図である。図８は、図５に示すケース８において駆動歯車３６が載置される台座部分４２の周辺部分を拡大した部分拡大図である。図９は、図８に示す回転規制部５５を第２支軸４１が設けられている側からみたときの斜視図である。図１０は、図８に示す回転規制部５５を案内壁が設けられている側からみたときの斜視図である。 (Structure of drive gear 36 and rotation regulation mechanism 50)
FIG. 6 is an explanatory diagram showing a meshed state between the drive gear 36 and the output gear 39 shown in FIG. 4 and the like. FIG. 6A is a perspective view of the drive gear 36 and the output gear 39 when viewed from the side of the missing gear 38 of the drive gear 36 (first direction X1 in the X direction), and FIG. 6B is a drive. It is a perspective view when the gear 36 and the output gear 39 are seen from the side of the large-diameter gear 37 of the drive gear 36 (the second direction X2 in the X direction). FIG. 7 is an explanatory view of the drive gear 36 shown in FIG. 6 and the like. FIG. 7 (a) is a perspective view of the drive gear 36 when viewed from the side of the missing gear 38 (first direction X1 in the X direction), and FIG. 7 (b) shows the drive gear 36 at its rotation center line ( It is a side view when viewed from the direction orthogonal to the axis L1), and FIG. 7 (c) is a plan view when the drive gear 36 is viewed from the side of the large diameter gear 37 (second direction X2 in the X direction). is there. FIG. 8 is a partially enlarged view of the peripheral portion of the pedestal portion 42 on which the drive gear 36 is placed in the case 8 shown in FIG. FIG. 9 is a perspective view of the rotation restricting portion 55 shown in FIG. 8 when viewed from the side where the second support shaft 41 is provided. FIG. 10 is a perspective view of the rotation restricting portion 55 shown in FIG. 8 when viewed from the side where the guide wall is provided.

図７に示すように、駆動歯車３６は、第３支軸４３が挿入される筒部５１と、筒部５１における軸線Ｌ１方向の途中位置から外周側に突出する環状突出部（突出部）５２を備える。環状突出部５２は外周面に第２歯車３５と噛合する歯部（第１歯部）３７ａを備える。すなわち、環状突出部５２は大径歯車３７を構成する。筒部５１における環状突出部５２よりもＸ方向の第１方向Ｘ１の側は、外周面の周方向の一部分に出力歯車３９と噛合する歯部（第２歯部）３８ａを備える。すなわち、筒部５１における環状突出部５２よりもＸ方向の第１方向Ｘ１の側の部分は欠歯歯車３８を構成する。筒部５１における環状突出部５２よりもＸ方向の第２方向Ｘ２の側は、円環状の外周面を備える歯車基部５３である。 As shown in FIG. 7, the drive gear 36 has a tubular portion 51 into which the third support shaft 43 is inserted and an annular projecting portion (projecting portion) 52 projecting from an intermediate position in the axial line L1 direction of the tubular portion 51 toward the outer peripheral side. To be equipped. The annular protrusion 52 is provided with a tooth portion (first tooth portion) 37a that meshes with the second gear 35 on the outer peripheral surface. That is, the annular protrusion 52 constitutes the large diameter gear 37. The side of the tubular portion 51 in the first direction X1 in the X direction with respect to the annular protrusion 52 is provided with a tooth portion (second tooth portion) 38a that meshes with the output gear 39 in a part of the peripheral surface in the circumferential direction. That is, the portion of the tubular portion 51 on the side of the annular protrusion 52 in the first direction X1 in the X direction constitutes the missing tooth gear 38. The side of the tubular portion 51 in the second direction X2 in the X direction with respect to the annular protrusion 52 is a gear base 53 having an annular outer peripheral surface.

また、駆動歯車３６は、図７（ｃ）に示すように、大径歯車３７（環状突出部５２）において底板部２５と対向するＸ方向の第２方向Ｘ２の端面（対向面）３７ｂに、軸線Ｌ１の回りに所定の角度範囲に渡る一定幅の円弧溝（溝部）５４を備える。円弧溝５４の内壁面において周方向の端をそれぞれ規定している壁面部分５４ａ、５４ｂは、軸線Ｌ１と平行で径方向に延びる平面である。壁面部分５４ａ、５４ｂは、ケース８に設けられた回転規制部５５とともに、駆動歯車３６の回転角度範囲を規制する回転規制機構５０を構成する。 Further, as shown in FIG. 7C, the drive gear 36 is provided on the end surface (opposing surface) 37b of the large-diameter gear 37 (annular protrusion 52) in the second direction X2 in the X direction facing the bottom plate portion 25. A circular arc groove (groove portion) 54 having a constant width over a predetermined angle range is provided around the axis L1. The wall surface portions 54a and 54b that define the circumferential ends of the inner wall surface of the arc groove 54 are planes that are parallel to the axis L1 and extend in the radial direction. The wall surface portions 54a and 54b, together with the rotation regulating portion 55 provided on the case 8, constitute a rotation regulating mechanism 50 that regulates the rotation angle range of the drive gear 36.

ここで、図５に示すように、回転規制部５５は、第３支軸４３の軸線Ｌ１回りにおいて、第２支軸４１と案内壁４７との間の角度範囲に設けられている。また、回転規制部５５は、第３支軸４３の外周側に第３支軸４３と一定の距離を開けて設けられている。回転規制部５５は、軸線Ｌ１回りを周方向に延びる略円弧形状の突条である。 Here, as shown in FIG. 5, the rotation restricting unit 55 is provided in an angle range between the second support shaft 41 and the guide wall 47 around the axis L1 of the third support shaft 43. Further, the rotation regulating portion 55 is provided on the outer peripheral side of the third support shaft 43 at a certain distance from the third support shaft 43. The rotation restricting portion 55 is a substantially arc-shaped ridge extending in the circumferential direction around the axis L1.

回転規制部５５は、図８に示すように、底板部２５のうち、台座部分４２の載置面４２ａからＸ方向の第１方向Ｘ１（第３支軸４３の軸線Ｌ１方向）に突出するストッパ部５６を備える。ストッパ部５６は、駆動歯車３６の筒部５１に第３支軸４３が挿入されて、駆
動歯車３６（筒部５１）が載置面４２ａに載置されたときに、後述する補強部５７より第１方向Ｘ１の先端部分が円弧溝５４に挿入される。 As shown in FIG. 8, the rotation restricting portion 55 is a stopper that projects from the mounting surface 42a of the pedestal portion 42 in the first direction X1 in the X direction (the axis L1 direction of the third support shaft 43) in the bottom plate portion 25. A unit 56 is provided. When the third support shaft 43 is inserted into the tubular portion 51 of the drive gear 36 and the drive gear 36 (cylinder portion 51) is mounted on the mounting surface 42a, the stopper portion 56 is formed from the reinforcing portion 57 described later. The tip portion of the first direction X1 is inserted into the arc groove 54.

ストッパ部５６において円弧溝５４に挿入される先端部分の周方向の両端には、壁面部分５４ａ、５４ｂに当接可能な度当たり部分５９ａ、５９ｂが設けられている。度当たり部分５９ａは、円弧溝５４の内壁面のうち、周方向の一方の端を規定する壁面部分５４ａと当接して駆動歯車３６の回転を規制する。度当たり部分５９ｂは、円弧溝５４の内壁面のうち、周方向の他方の端を規定する壁面部分５４ｂと当接して駆動歯車３６の回転を規制する。各度当たり部分５９ａ、５９ｂは、それぞれ軸線Ｌ１と平行で径方向に延びて軸線Ｌ１周りの周方向に向いた平面である。駆動歯車３６は、度当たり部分５９ａが円弧溝５４の一方の壁面部分５４ａに当接する位置から、度当たり部分５９ｂが円弧溝５４の他方の壁面部分５４ｂに当接する位置までの間でその回転が許容される。 At both ends of the stopper portion 56 in the circumferential direction of the tip portion inserted into the arc groove 54, perforated portions 59a and 59b that can come into contact with the wall surface portions 54a and 54b are provided. The per-degree portion 59a abuts on the wall surface portion 54a that defines one end in the circumferential direction of the inner wall surface of the arc groove 54 to regulate the rotation of the drive gear 36. The per-degree portion 59b comes into contact with the wall surface portion 54b that defines the other end in the circumferential direction of the inner wall surface of the arc groove 54 to regulate the rotation of the drive gear 36. Each degree portion 59a and 59b is a plane that is parallel to the axis L1 and extends in the radial direction and faces the circumferential direction around the axis L1. The rotation of the drive gear 36 extends from the position where the degree portion 59a abuts on one wall surface portion 54a of the arc groove 54 to the position where the degree portion 59b abuts on the other wall surface portion 54b of the arc groove 54. Permissible.

また、回転規制部５５は、後述するように、Ｘ方向（軸線Ｌ１方向）から見た場合にストッパ部５６の側壁５６０から外側に張り出した補強部５７を備える。補強部５７は、Ｘ方向（軸線Ｌ１）で載置面４２ａと度当たり部分５９ａ、５９ｂとの間に設けられている。すなわち、補強部５７は、度当たり部分５９ａ、５９ｂより底板部２５側の根元部分でＸ方向（軸線Ｌ１方向）からみたときにストッパ部５６の側壁５６０から外側に張り出している。かかる補強部５７の側面５７０は、底板部２５とは反対側の端部がストッパ部５６の側壁５６０に連続し、底板部２５側の端部が底板部２５に連続している。従って、補強部５７は、ストッパ部５６を補強している。本形態において、底板部２５は、台座部分４２を備えており、補強部５７の底板部２５側の端部の一部は、底板部２５のうち、台座部分４２に連続している。また、補強部５７の側面５７０は、底板部２５とは反対側の端部で凹曲面または斜面になっており、かかる凹曲面または斜面がストッパ部５６の側壁５６０に段部を形成することなく連続している。すなわち、補強部５７の側面５７０は、底板部２５とは反対側の端部を軸線Ｌ１に平行な面で切断したとき、凹状の円弧等の曲線、あるいは斜線になっている。本形態において、補強部５７の側面５７０は、底板部２５とは反対側の端部で凹曲面になっているため、ストッパ部５６の側壁５６０になめらかに連続している。 Further, as will be described later, the rotation restricting portion 55 includes a reinforcing portion 57 projecting outward from the side wall 560 of the stopper portion 56 when viewed from the X direction (axis L1 direction). The reinforcing portion 57 is provided between the mounting surface 42a and the degree portions 59a and 59b in the X direction (axis line L1). That is, the reinforcing portion 57 projects outward from the side wall 560 of the stopper portion 56 when viewed from the X direction (axis L1 direction) at the root portion on the bottom plate portion 25 side of the perforated portions 59a and 59b. On the side surface 570 of the reinforcing portion 57, the end portion on the side opposite to the bottom plate portion 25 is continuous with the side wall 560 of the stopper portion 56, and the end portion on the bottom plate portion 25 side is continuous with the bottom plate portion 25. Therefore, the reinforcing portion 57 reinforces the stopper portion 56. In the present embodiment, the bottom plate portion 25 includes a pedestal portion 42, and a part of the end portion of the reinforcing portion 57 on the bottom plate portion 25 side is continuous with the pedestal portion 42 of the bottom plate portion 25. Further, the side surface 570 of the reinforcing portion 57 has a concave curved surface or a slope at an end opposite to the bottom plate portion 25, and the concave curved surface or the slope does not form a step portion on the side wall 560 of the stopper portion 56. It is continuous. That is, the side surface 570 of the reinforcing portion 57 has a curved line such as a concave arc or a diagonal line when the end portion on the side opposite to the bottom plate portion 25 is cut along a plane parallel to the axis L1. In the present embodiment, the side surface 570 of the reinforcing portion 57 has a concave curved surface at the end opposite to the bottom plate portion 25, so that the side surface 570 is smoothly continuous with the side wall 560 of the stopper portion 56.

本例では、補強部５７として、軸線Ｌ１回りをストッパ部５６の根元側（度当たり部分５９ａより根元側）から周方向の一方側に張り出すように突出して案内壁４７に連続する第１周方向補強部５７ａと、ストッパ部５６の外周側に張り出すように突出した径方向外側補強部５７ｂと、軸線Ｌ１回りをストッパ部５６の根元側（度当たり部分５９ｂより根元側）から周方向の他方側に張り出すように突出した第２周方向補強部５７ｃとを備える。ここで、径方向外側補強部５７ｂは、台座部分４２の縁と重なっているため、第１周方向補強部５７ａおよび第２周方向補強部５７ｃの底板部２５側の端部は、底板部２５のうち、台座部分４２の載置面４２ａに連続し、径方向外側補強部５７ｂの端部は、底板部２５のうち、台座部分４２が形成されていない部分に連続している。なお、案内壁４７の案内面４７ａは回転規制部５５とは反対側に位置する。 In this example, as the reinforcing portion 57, the first circumference continuous with the guide wall 47 is projected so as to project around the axis L1 from the root side of the stopper portion 56 (the root side from the degree contact portion 59a) to one side in the circumferential direction. The directional reinforcing portion 57a, the radial outer reinforcing portion 57b protruding so as to project to the outer peripheral side of the stopper portion 56, and the axis L1 circumference in the circumferential direction from the root side of the stopper portion 56 (the root side from the perforated portion 59b). It is provided with a second circumferential reinforcing portion 57c that protrudes so as to project to the other side. Here, since the radial outer reinforcing portion 57b overlaps with the edge of the pedestal portion 42, the ends of the first circumferential reinforcing portion 57a and the second circumferential reinforcing portion 57c on the bottom plate portion 25 side are the bottom plate portion 25. Of these, the end portion of the radial outer reinforcing portion 57b is continuous with the mounting surface 42a of the pedestal portion 42, and is continuous with the portion of the bottom plate portion 25 where the pedestal portion 42 is not formed. The guide surface 47a of the guide wall 47 is located on the opposite side of the rotation restricting portion 55.

本形態において、第１周方向補強部５７ａ、径方向外側補強部５７ｂ、および第２周方向補強部５７ｃは各々、底板部２５とは反対側の端部と底板部２５側の端部との間に、軸線Ｌ１方向に対して直交する方向に側面を向けて底板部２５から第３支軸４３と同一方向に突出した底上げ部５７ｄ、５７ｅ、５７ｆを備えている。本形態において、底上げ部５７ｄ、５７ｅ、５７ｆのうち、第１周方向補強部５７ａの底上げ部５７ｄ、および第２周方向補強部５７ｃの底上げ部５７ｆは、ストッパ部５６の度当たり部分５９ａ、５９ｂより周方向に大きく張り出しており、Ｘ方向の第１方向Ｘ１に向いた平面を備えている。 In the present embodiment, the first circumferential reinforcing portion 57a, the radial outer reinforcing portion 57b, and the second circumferential reinforcing portion 57c are each of an end portion on the side opposite to the bottom plate portion 25 and an end portion on the bottom plate portion 25 side. In between, bottom raising portions 57d, 57e, and 57f are provided so as to project from the bottom plate portion 25 in the same direction as the third support shaft 43 with the side surface facing in a direction orthogonal to the axis L1 direction. In the present embodiment, among the bottom raising portions 57d, 57e, 57f, the bottom raising portion 57d of the first circumferential reinforcing portion 57a and the bottom raising portion 57f of the second circumferential reinforcing portion 57c are the perforated portions 59a, 59b of the stopper portion 56. It overhangs more in the circumferential direction and has a plane facing the first direction X1 in the X direction.

ここで、第１周方向補強部５７ａにおけるＸ方向の第１方向Ｘ１の端部分はストッパ部
５６になめらかに連続する。すなわち、第１周方向補強部５７ａは、底上げ部５７ｄのストッパ部５６との境界部分に、Ｘ方向の第１方向Ｘ１に向かってストッパ部５６に接近する凹曲面５５ａを有するアール部分を備える。凹曲面５５ａは度当たり部分５９ａのＸ方向の第２方向Ｘ２の端縁に段差なく連続する。 Here, the end portion of the first circumferential direction reinforcing portion 57a in the first direction X1 in the X direction is smoothly continuous with the stopper portion 56. That is, the first circumferential reinforcing portion 57a includes a rounded portion having a concave curved surface 55a that approaches the stopper portion 56 toward the first direction X1 in the X direction at the boundary portion of the bottom raising portion 57d with the stopper portion 56. The concave curved surface 55a is continuous with the edge of the perforated portion 59a in the second direction X2 in the X direction without a step.

また、径方向外側補強部５７ｂにおけるＸ方向の第１方向Ｘ１の端部分はストッパ部５６になめらかに連続する。すなわち、径方向外側補強部５７ｂは、底上げ部５７ｅのストッパ部５６との境界部分にＸ方向の第１方向Ｘ１に向かってストッパ部５６に接近する凹曲面５５ｂを有するアール部分を備える。ここで、ストッパ部５６は、先端部分における第３支軸４３とは反対側に、周方向に一定幅で延びて度当たり部分５９ａ、５９ｂとの間を接続する円弧面５６ｂを備える。凹曲面５５ｂは、この円弧面５６ｂのＸ方向の第２方向Ｘ２の端縁に段差なく連続する。なお、円弧面５６ｂの幅（Ｘ方向の寸法）は、度当たり部分５９ａ、５９ｂの幅（Ｘ方向の寸法）と等しい。 Further, the end portion of the radial outer reinforcing portion 57b in the first direction X1 in the X direction is smoothly continuous with the stopper portion 56. That is, the radial outer reinforcing portion 57b includes a rounded portion having a concave curved surface 55b that approaches the stopper portion 56 in the first direction X1 in the X direction at the boundary portion of the bottom raising portion 57e with the stopper portion 56. Here, the stopper portion 56 includes an arcuate surface 56b at the tip portion opposite to the third support shaft 43, which extends in the circumferential direction with a constant width and connects between the perforated portions 59a and 59b. The concave curved surface 55b is continuous with the edge of the arcuate surface 56b in the second direction X2 in the X direction without any step. The width of the arcuate surface 56b (dimension in the X direction) is equal to the width of the per-degree portions 59a and 59b (dimension in the X direction).

また、第２周方向補強部５７ｃにおけるＸ方向の第１方向Ｘ１の端部分はストッパ部５６になめからに連続する。すなわち、第２周方向補強部５７ｃは、底上げ部５７ｆのストッパ部５６との境界部分に、Ｘ方向の第１方向Ｘ１に向かってストッパ部５６に接近する凹曲面５５ｃを有するアール部分を備える。凹曲面５５ｃは度当たり部分５９ｂのＸ方向の第２方向Ｘ２の端縁に段差なく連続する。 Further, the end portion of the second circumferential direction reinforcing portion 57c in the first direction X1 in the X direction is continuous from the stopper portion 56 after being licked. That is, the second circumferential reinforcing portion 57c includes a rounded portion having a concave curved surface 55c that approaches the stopper portion 56 toward the first direction X1 in the X direction at the boundary portion of the bottom raising portion 57f with the stopper portion 56. The concave curved surface 55c is continuous with the edge of the perforated portion 59b in the second direction X2 in the X direction without a step.

さらに、第２周方向補強部５７ｃにおけるＸ方向の第２方向Ｘ２の端部分は載置面４２ａになめからに連続する。すなわち、第２周方向補強部５７ｃは、台座部分４２との周方向の境界部分に、周方向に向かって載置面４２ａに接近する凹曲面５５ｄを有するアール部分を備える。凹曲面５５ｄは載置面４２ａに段差なく連続する。 Further, the end portion of the second circumferential direction reinforcing portion 57c in the second direction X2 in the X direction is continuous from the mounting surface 42a. That is, the second circumferential reinforcing portion 57c includes a rounded portion having a concave curved surface 55d that approaches the mounting surface 42a in the circumferential direction at the boundary portion in the circumferential direction with the pedestal portion 42. The concave curved surface 55d is continuous with the mounting surface 42a without a step.

また、径方向外側補強部５７ｂ（底上げ部５７ｅ）の径方向外側の側面は、第１周方向補強部５７ａおよび第２周方向補強部５７ｃの底上げ部５７ｄ、５７ｆの径方向外側の側面と連続した円弧面を形成しており、かかる底上げ部５７ｄ、５７ｅ、５７ｆの径方向外側の側面は、Ｘ方向の第２方向Ｘ２の端部が凹曲面または斜面になっている。従って、底上げ部５７ｄ、５７ｅ、５７ｆの径方向外側の側面は、底板部２５に段差を形成することなく連続している。本形態において、底上げ部５７ｄ、５７ｅ、５７ｆの径方向外側の側面は、Ｘ方向の第２方向Ｘ２の端部が凹曲面５５ｅになっており、底板部２５になめらかに連続する。

Further, the radial outer side surface of the radial outer reinforcing portion 57b (bottom raising portion 57e) is continuous with the radial outer side surfaces of the bottom raising portions 57d and 57f of the first circumferential reinforcing portion 57a and the second circumferential reinforcing portion 57c. The arc surface is formed, and the radial outer side surfaces of the bottom raising portions 57 d , 57e, 57f have a concave curved surface or an inclined end portion in the second direction X2 in the X direction. Thus, the raised bottom portion 57 d, 57e, radially outer side of 57f is continuous without forming a step on the bottom plate portion 25. In the present embodiment, the radial outer side surfaces of the bottom raising portions 57 d , 57e, 57f have a concave curved surface 55e at the end of the second direction X2 in the X direction, and are smoothly continuous with the bottom plate portion 25.

ストッパ部５６において第３支軸４３の側に位置する内周側壁面５６ａは第３支軸４３の軸線Ｌ１中心に規定される円弧面である。本形態において、ストッパ部５６において第３支軸４３の側に位置する内周側壁面５６ａは、第１周方向補強部５７ａおよび第２周方向補強部５７ｃの底上げ部５７ｄ、５７ｆの径方向内側の側面と連続した円弧面を形成しており、かかる内周側壁面５６ａ、および底上げ部５７ｄ、５７ｆの径方向内側の側面は、Ｘ方向の第２方向Ｘ２の端部が凹曲面または斜面になっている。本形態では、内周側壁面５６ａ、および底上げ部５７ｄ、５７ｆの径方向内側の側面は、Ｘ方向の第２方向Ｘ２の端部が凹曲面５５ｆになっており、底板部２５の台座部分４２になめらかに連続する。ここで、凹曲面５５ｆのうち、内周側壁面５６ａに形成されている部分は、ストッパ部５６の側壁５６０から径方向内側に張り出した径方向内側補強部５７ｇを構成しており、かかる径方向内側補強部５７ｇの底板部２５とは反対側の端部は、ストッパ部５６の内周側壁面５６ａになめらかに連続している。なお、径方向内側補強部５７ｇは、他の補強部（第１周方向補強部５７ａ、径方向外側補強部５７ｂ、および第２周方向補強部５７ｃ）よりＸ方向における寸法が小さく、底板部２５からみたときに低い位置にある。このため、駆動歯車３６と径方向内側補強部５７ｇとの干渉は発生しない。 The inner peripheral side wall surface 56a located on the side of the third support shaft 43 in the stopper portion 56 is an arc surface defined at the center of the axis L1 of the third support shaft 43. In the present embodiment, the inner peripheral side wall surface 56a located on the side of the third support shaft 43 in the stopper portion 56 is radially inside the bottom raising portions 57d and 57f of the first circumferential reinforcing portion 57a and the second circumferential reinforcing portion 57c. The inner peripheral side wall surface 56a and the radial inner side surfaces of the bottom raising portions 57d and 57f have a concave curved surface or an inclined end portion in the second direction X2 in the X direction. It has become. In this embodiment, the inner peripheral side wall surface 56a and the radial inner side surfaces of the bottom raising portions 57d and 57f have a concave curved surface 55f at the end in the second direction X2 in the X direction, and the pedestal portion 42 of the bottom plate portion 25. Smoothly continuous. Here, of the concave curved surface 55f, the portion formed on the inner peripheral side wall surface 56a constitutes a radial inner reinforcing portion 57g projecting radially inward from the side wall 560 of the stopper portion 56, and the radial inner reinforcing portion 57g is formed. The end portion of the inner reinforcing portion 57g opposite to the bottom plate portion 25 is smoothly continuous with the inner peripheral side wall surface 56a of the stopper portion 56. The radial inner reinforcing portion 57g is smaller in the X direction than the other reinforcing portions (first circumferential reinforcing portion 57a, radial outer reinforcing portion 57b, and second circumferential reinforcing portion 57c), and the bottom plate portion 25 It is in a low position when viewed from the outside. Therefore, interference between the drive gear 36 and the radial inner reinforcing portion 57g does not occur.

本形態において、図３および図６に矢印Ａ１で示す駆動歯車３６の第１回転方向Ａ１は、バッフル２を開く方向に回転させる回転方向である。駆動歯車３６に従動する出力歯車３９は、駆動歯車３６が第１回転方向Ａ１に回転する際に、図３、図６に矢印Ｂ１で示す第１回転方向Ｂ１に回転する。一方、図３、図６に矢印Ａ２で示す駆動歯車３６の第２回転方向Ａ２は、バッフル２を閉じる方向に回転させる回転方向である。駆動歯車３６に従動する出力歯車３９は、駆動歯車３６が第２回転方向Ａ２に回転する際に、図３に矢印Ｂ２で示す第２回転方向Ｂ２に回転する。 In the present embodiment, the first rotation direction A1 of the drive gear 36 indicated by the arrow A1 in FIGS. 3 and 6 is a rotation direction for rotating the baffle 2 in the opening direction. The output gear 39 driven by the drive gear 36 rotates in the first rotation direction B1 indicated by the arrow B1 in FIGS. 3 and 6 when the drive gear 36 rotates in the first rotation direction A1. On the other hand, the second rotation direction A2 of the drive gear 36 indicated by the arrow A2 in FIGS. 3 and 6 is a rotation direction for rotating the baffle 2 in the closing direction. The output gear 39 driven by the drive gear 36 rotates in the second rotation direction B2 indicated by the arrow B2 in FIG. 3 when the drive gear 36 rotates in the second rotation direction A2.

バッフル２が閉位置２Ｂに配置された状態では、図６（ｂ）に示すように、大径歯車３７の円弧溝５４の周方向の一方の端を規定する壁面部分５４ａとケース８の回転規制部５５（ストッパ部５６の度当たり部分５９ａ）とが当接する。度当たり部分５９ａは、駆動歯車３６の第２回転方向Ａ２の前方から壁面部分５４ａに当接し、駆動歯車３６が第２回転方向Ａ２（バッフル２を閉じる回転方向）にそれ以上回転することを規制する。一方、バッフル２が開位置２Ａに配置された状態では、大径歯車３７の円弧溝５４の周方向の他方の端を規定する壁面部分５４ｂとケース８の回転規制部５５（ストッパ部５６の度当たり部分５９ｂ）とが当接する（図１３参照）。度当たり部分５９ｂは、駆動歯車３６の第１回転方向Ａ１の前方から壁面部分５４ｂに当接し、駆動歯車３６が第１回転方向Ａ１（バッフル２を開く回転方向）にそれ以上回転することを規制する。 When the baffle 2 is arranged at the closed position 2B, as shown in FIG. 6B, the rotation regulation of the wall surface portion 54a and the case 8 that define one end in the circumferential direction of the arc groove 54 of the large-diameter gear 37. The portion 55 (the perforated portion 59a of the stopper portion 56) comes into contact with the portion 55. The per degree portion 59a abuts on the wall surface portion 54a from the front of the second rotation direction A2 of the drive gear 36, and restricts the drive gear 36 from rotating further in the second rotation direction A2 (rotation direction in which the baffle 2 is closed). To do. On the other hand, when the baffle 2 is arranged at the open position 2A, the wall surface portion 54b that defines the other end in the circumferential direction of the arc groove 54 of the large-diameter gear 37 and the rotation restricting portion 55 of the case 8 (degree of the stopper portion 56). The contact portion 59b) comes into contact with the contact portion (see FIG. 13). The per degree portion 59b abuts on the wall surface portion 54b from the front of the first rotation direction A1 of the drive gear 36, and restricts the drive gear 36 from rotating further in the first rotation direction A1 (the rotation direction in which the baffle 2 is opened). To do.

次に、欠歯歯車３８は、図７（ａ）および図７（ｂ）に示すように、１８０°よりも狭い所定の角度範囲に渡って歯部３８ａを備える。また、欠歯歯車３８は、歯部３８ａに周方向で隣り合う位置に、歯部３８ａの歯先円よりも外周側で前記歯先円に沿って湾曲する外周面６０ａを有する円弧状外周部（外周部）６０を備える。円弧状外周部６０は、大径歯車３７のＸ方向の第１方向Ｘ１の端面から駆動歯車３６の回転中心軸線（軸線Ｌ１）に沿ってＸ方向の第１方向Ｘ１に突出している。また、円弧状外周部６０は、Ｘ方向の長さが歯部３８ａの歯幅（歯部３８ａのＸ方向の長さ）よりも短く、Ｘ方向における歯部３８ａの途中の位置にＸ方向の第１方向Ｘ１（軸線Ｌ１方向の一方側）を向く端面６０ｂを備える。円弧状外周部６０の外周面６０ａは、歯部３８ａの歯先円と同心で、歯先円よりも大径の円弧面である。 Next, the missing tooth gear 38 includes the tooth portion 38a over a predetermined angle range narrower than 180 °, as shown in FIGS. 7 (a) and 7 (b). Further, the missing tooth gear 38 has an arcuate outer peripheral portion 60a having an outer peripheral surface 60a curved along the tooth tip circle on the outer peripheral side of the tooth tip circle of the tooth portion 38a at a position adjacent to the tooth portion 38a in the circumferential direction. (Outer peripheral portion) 60 is provided. The arcuate outer peripheral portion 60 projects from the end surface of the large-diameter gear 37 in the first direction X1 in the X direction along the rotation center axis (axis L1) of the drive gear 36 in the first direction X1 in the X direction. Further, the arc-shaped outer peripheral portion 60 has a length in the X direction shorter than the tooth width of the tooth portion 38a (the length of the tooth portion 38a in the X direction), and is located in the middle of the tooth portion 38a in the X direction in the X direction. The end face 60b facing the first direction X1 (one side in the axis L1 direction) is provided. The outer peripheral surface 60a of the arc-shaped outer peripheral portion 60 is an arc surface that is concentric with the tooth tip circle of the tooth portion 38a and has a diameter larger than that of the tooth tip circle.

（出力歯車３９の構成）
図１１は、図６に示す出力歯車３９の斜視図であり、出力歯車３９をＸ方向の第１方向Ｘ１の側から見た場合の斜視図である。図１２は、図１に示す冷気ダンパ１において、バッフル２が閉位置２Ｂにあるときの駆動歯車３６および出力歯車３９の平面図である。図１１に示すように、出力歯車３９は、出力軸６ａと、出力軸６ａと同軸の軸部６１と、出力軸６ａと軸部６１との間に同軸に設けられた円柱部６２を有する。軸部６１は出力歯車３９のＸ方向の第２方向Ｘ２の端に位置する。軸部６１はケース８の底板部２５の軸受用筒部４４に挿入される。これにより、出力歯車３９は、軸受用筒部４４の軸線Ｌ２回りに回転可能となる。 (Structure of output gear 39)
FIG. 11 is a perspective view of the output gear 39 shown in FIG. 6, which is a perspective view of the output gear 39 when viewed from the side of the first direction X1 in the X direction. FIG. 12 is a plan view of the drive gear 36 and the output gear 39 when the baffle 2 is in the closed position 2B in the cold air damper 1 shown in FIG. As shown in FIG. 11, the output gear 39 has an output shaft 6a, a shaft portion 61 coaxial with the output shaft 6a, and a cylindrical portion 62 coaxially provided between the output shaft 6a and the shaft portion 61. The shaft portion 61 is located at the end of the output gear 39 in the second direction X2 in the X direction. The shaft portion 61 is inserted into the bearing cylinder portion 44 of the bottom plate portion 25 of the case 8. As a result, the output gear 39 can rotate around the axis L2 of the bearing cylinder 44.

出力軸６ａは、駆動機構６の出力軸６ａである。出力軸６ａの外周面には軸線Ｌ２を挟んだ両側に平行な平坦部６４が設けられている。バッフル２の第１軸部２１には、Ｘ方向の第２方向Ｘ２の端面に出力軸６ａに嵌合する凹部が形成されており、出力軸６ａを凹部に嵌め込むことにより出力軸６ａの回転がバッフル２に伝達可能となる。円柱部６２の外径は軸部６１の外径および出力軸６ａの外径よりも大きい。 The output shaft 6a is the output shaft 6a of the drive mechanism 6. Flat portions 64 parallel to both sides of the axis L2 are provided on the outer peripheral surface of the output shaft 6a. The first shaft portion 21 of the baffle 2 is formed with a recess that fits into the output shaft 6a on the end surface of the second direction X2 in the X direction, and the output shaft 6a is rotated by fitting the output shaft 6a into the recess. Can be transmitted to the baffle 2. The outer diameter of the cylindrical portion 62 is larger than the outer diameter of the shaft portion 61 and the outer diameter of the output shaft 6a.

また、出力歯車３９は、円柱部６２の外周側に、その外周面に歯部３９ａを有する円弧部６５を備える。円柱部６２と円弧部６５の間には、径方向に延びてこれらを接続する連結部６６を備える。 Further, the output gear 39 is provided with an arc portion 65 having tooth portions 39a on the outer peripheral surface thereof on the outer peripheral side of the cylindrical portion 62. Between the cylindrical portion 62 and the arc portion 65, a connecting portion 66 extending in the radial direction and connecting them is provided.

歯部３９ａを構成する複数の歯のうち第１回転方向Ｂ１（バッフルを開く回転方向）の前端に位置する第１歯６８は、図６（ａ）、図１１に示すように、欠歯歯車３８の円弧状外周部６０の外周面６０ａに対向する部分が切り欠かれている。これにより、第１歯６８は、円弧状外周部６０の端面６０ｂにおけるＸ方向の第１方向Ｘ１で欠歯歯車３８の歯先円の内周側に進入可能となっている。また、歯部３９ａを構成する複数の歯のうち第１歯６８の隣に位置する第２歯６９は、第１歯６８が位置する側から軸線Ｌ２方向に切り欠かれている。第２歯６９の歯幅は、円弧状外周部６０のＸ方向の高さ寸法よりも短く、第２歯６９は、円弧状外周部６０の端面６０ｂよりもＸ方向の第２方向Ｘ２の側に位置し、円弧状外周部６０の端面６０ｂからＸ方向の第１方向Ｘ１の側には突出していない。出力歯車において第１歯６８および第２歯６９を除く他の歯は、欠歯歯車３８の歯部３８ａの各歯の歯幅と同一の歯幅を備える。 Of the plurality of teeth constituting the tooth portion 39a, the first tooth 68 located at the front end in the first rotation direction B1 (rotation direction in which the baffle is opened) is a missing tooth gear as shown in FIGS. A portion of the arcuate outer peripheral portion 60 of 38 facing the outer peripheral surface 60a is cut out. As a result, the first tooth 68 can enter the inner peripheral side of the tooth tip circle of the missing tooth gear 38 in the first direction X1 in the X direction on the end surface 60b of the arcuate outer peripheral portion 60. Further, the second tooth 69 located next to the first tooth 68 among the plurality of teeth constituting the tooth portion 39a is cut out in the axis L2 direction from the side where the first tooth 68 is located. The tooth width of the second tooth 69 is shorter than the height dimension of the arc-shaped outer peripheral portion 60 in the X direction, and the second tooth 69 is on the side of the arc-shaped outer peripheral portion 60 in the second direction X2 in the X direction with respect to the end surface 60b. It is located at, and does not protrude from the end surface 60b of the arcuate outer peripheral portion 60 to the side of the first direction X1 in the X direction. In the output gear, the teeth other than the first tooth 68 and the second tooth 69 have the same tooth width as the tooth width of each tooth of the tooth portion 38a of the missing tooth gear 38.

ここで、図１２に示すように、出力歯車３９の第１歯６８が欠歯歯車３８の円弧状外周部６０の端面６０ｂにおけるＸ方向の第１方向Ｘ１で歯先円の内周側に進入すると、出力歯車３９の第２歯６９が円弧状外周部６０の外周面６０ａに当接して出力歯車３９の回転が規制される。すなわち、欠歯歯車３８の円弧状外周部６０、出力歯車３９の第１歯６８および第２歯６９は、出力歯車３９の特定方向への回転を規制する第２の回転規制機構７０を構成する。本例では、駆動歯車３６がバッフル２を閉じる第２回転方向Ａ２に回転した後に回転規制機構５０によって第２回転方向Ａ２の回転が規制される規制位置で停止すると、出力歯車３９の第１歯６８が、欠歯歯車３８の円弧状外周部６０の端面６０ｂにおけるＸ方向の第１方向Ｘ１で歯先円の内周側に進入する。これにより、出力歯車３９の第２歯６９が円弧状外周部６０の外周面６０ａに当接して、出力歯車３９がバッフル２を開く第１回転方向Ｂ１に回転することが規制される。 Here, as shown in FIG. 12, the first tooth 68 of the output gear 39 enters the inner peripheral side of the tooth tip circle in the first direction X1 in the X direction on the end surface 60b of the arcuate outer peripheral portion 60 of the missing gear 38. Then, the second tooth 69 of the output gear 39 comes into contact with the outer peripheral surface 60a of the arcuate outer peripheral portion 60, and the rotation of the output gear 39 is restricted. That is, the arcuate outer peripheral portion 60 of the missing tooth gear 38, the first tooth 68 and the second tooth 69 of the output gear 39 constitute a second rotation regulating mechanism 70 that regulates the rotation of the output gear 39 in a specific direction. .. In this example, when the drive gear 36 rotates in the second rotation direction A2 that closes the baffle 2 and then stops at a restricted position where the rotation of the second rotation direction A2 is restricted by the rotation regulation mechanism 50, the first tooth of the output gear 39 68 enters the inner peripheral side of the tooth tip circle in the first direction X1 in the X direction on the end surface 60b of the arcuate outer peripheral portion 60 of the missing gear 38. As a result, the second tooth 69 of the output gear 39 comes into contact with the outer peripheral surface 60a of the arcuate outer peripheral portion 60, and the output gear 39 is restricted from rotating in the first rotation direction B1 that opens the baffle 2.

（冷気ダンパによる開口部の開閉動作）
図１３および図１４は、図１に示す冷気ダンパ１による開口部３の開閉動作の説明図である。図１３（ａ）はバッフル２が開位置２Ａにある状態のバッフル２およびフレーム５の断面図であり、図１３（ｂ）はバッフル２が開位置２Ａにある場合の欠歯歯車３８と出力歯車３９の噛合状態を示すギアユニット１０の部分平面図である。図１４（ａ）はバッフル２が閉位置２Ｂにある場合のバッフル２およびフレーム５の断面図であり、図１４（ｂ）はバッフル２が閉位置２Ｂにある場合の欠歯歯車３８と出力歯車３９の噛合状態を示すギアユニット１０の部分平面図である。 (Opening and closing operation of the opening with a cold air damper)
13 and 14 are explanatory views of the opening / closing operation of the opening 3 by the cold air damper 1 shown in FIG. 13 (a) is a cross-sectional view of the baffle 2 and the frame 5 with the baffle 2 in the open position 2A, and FIG. 13 (b) shows the missing tooth gear 38 and the output gear when the baffle 2 is in the open position 2A. It is a partial plan view of the gear unit 10 which shows the meshing state of 39. FIG. 14A is a cross-sectional view of the baffle 2 and the frame 5 when the baffle 2 is in the closed position 2B, and FIG. 14B is a missing tooth gear 38 and an output gear when the baffle 2 is in the closed position 2B. It is a partial plan view of the gear unit 10 which shows the meshing state of 39.

図１（ａ）および図１３に示すように、バッフル２が開位置２Ａに配置されている状態では、駆動歯車３６は、回転規制機構５０によって第１回転方向Ａ１（バッフル２を開く回転方向）への更なる回転が規制される規制位置で停止している。すなわち、ケース８に設けられた回転規制部５５は、その度当たり部分５９ｂが駆動歯車３６の円弧溝５４の壁面部分５４ｂに当接して、駆動歯車３６の第１回転方向Ａ１への回転を規制している。欠歯歯車３８の歯部３８ａには、出力歯車３９の複数の歯のうちの周方向で第１歯６８とは反対側の端部分に位置する２枚の歯７２が噛合している。 As shown in FIGS. 1A and 13, when the baffle 2 is arranged at the open position 2A, the drive gear 36 is subjected to the first rotation direction A1 (rotational direction in which the baffle 2 is opened) by the rotation regulation mechanism 50. It has stopped at a regulated position where further rotation to is regulated. That is, the rotation restricting portion 55 provided in the case 8 restricts the rotation of the driving gear 36 in the first rotation direction A1 by the contact portion 59b contacting the wall surface portion 54b of the arc groove 54 of the driving gear 36. doing. The tooth portion 38a of the missing tooth gear 38 is meshed with two teeth 72 located at the end portion of the plurality of teeth of the output gear 39 opposite to the first tooth 68 in the circumferential direction.

開口部３を閉じる際には、冷気ダンパ１はモータ３１を所定のステップ数だけ所定の回転方向に駆動する。これにより、駆動歯車３６は第２回転方向Ａ２に回転する。従って、出力歯車３９は第２回転方向Ｂ２に回転する。出力歯車３９が第２回転方向Ｂ２に回転すると、出力歯車３９の出力軸６ａに連結されたバッフル２は、開位置２Ａから閉位置２Ｂに向う閉方向Ｃに回転する。 When closing the opening 3, the cold air damper 1 drives the motor 31 in a predetermined rotation direction by a predetermined number of steps. As a result, the drive gear 36 rotates in the second rotation direction A2. Therefore, the output gear 39 rotates in the second rotation direction B2. When the output gear 39 rotates in the second rotation direction B2, the baffle 2 connected to the output shaft 6a of the output gear 39 rotates in the closing direction C from the open position 2A to the closing position 2B.

モータ３１が所定のステップ数だけ駆動されると、駆動歯車３６は、図１４に示すように、回転規制機構５０によって第２回転方向Ａ２（バッフル２を閉じる回転方向）の回転が規制される規制位置で停止する。すなわち、ケース８に設けられた回転規制部５５（ス
トッパ部５６の度当たり部分５９ａ）は駆動歯車３６の円弧溝５４の壁面部分５４ａに当接して、駆動歯車３６の第２回転方向Ａ２への更なる回転を規制する。この状態では、出力歯車３９の第１歯６８が欠歯歯車３８の円弧状外周部６０の端面６０ｂにおけるＸ方向の第１方向Ｘ１で出力歯車３９の歯先円の内周側に進入する。また、出力歯車３９の第２歯６９が円弧状外周部６０の外周面６０ａに当接する。バッフル２は、閉位置２Ｂに配置され、弾性部材２０はフレーム５のシール板部１４に当接して弾性変形する。従って、開口部３はバッフル２によって確実に閉鎖される。 When the motor 31 is driven by a predetermined number of steps, the drive gear 36 is regulated by the rotation regulation mechanism 50 in the second rotation direction A2 (rotation direction in which the baffle 2 is closed), as shown in FIG. Stop at position. That is, the rotation restricting portion 55 (percussion portion 59a of the stopper portion 56) provided in the case 8 abuts on the wall surface portion 54a of the arc groove 54 of the drive gear 36 and moves the drive gear 36 in the second rotation direction A2. Regulate further rotation. In this state, the first tooth 68 of the output gear 39 enters the inner peripheral side of the tooth tip circle of the output gear 39 in the first direction X1 in the X direction on the end surface 60b of the arcuate outer peripheral portion 60 of the missing tooth gear 38. Further, the second tooth 69 of the output gear 39 comes into contact with the outer peripheral surface 60a of the arcuate outer peripheral portion 60. The baffle 2 is arranged at the closed position 2B, and the elastic member 20 abuts on the seal plate portion 14 of the frame 5 and elastically deforms. Therefore, the opening 3 is securely closed by the baffle 2.

なお、モータ３１が駆動される所定のステップ数は、開位置２Ａに配置されているバッフル２を閉位置２Ｂに到達させる規定のステップ数に複数ステップを加えた値とされている。従って、バッフル２が閉位置２Ｂに配置された後にモータ３１は更に複数ステップ駆動される。この結果、バッフル２は閉位置２Ｂから更にシール板部１４に接近する方向に押し付けられ、弾性部材２０をより変形させる。これにより、開口部３の閉鎖がより確実なものとなる。ここで、バッフル２が閉位置２Ｂに配置された後にモータ３１が更に複数ステップ駆動されると、モータ３１で脱調が発生するので、脱調に起因してバッフル２がばたつきやすくなる。このような問題に対して、本例では、バッフル２が閉位置２Ｂに配置された状態では、出力歯車３９の第２歯６９が円弧状外周部６０の外周面６０ａに当接し、出力歯車３９がバッフル２を開く第１回転方向Ｂ１に回転することが阻止されている。従って、モータ３１で発生する脱調に起因して、バッフル２がばたつくことを抑制できる。 The predetermined number of steps for driving the motor 31 is a value obtained by adding a plurality of steps to the predetermined number of steps for causing the baffle 2 arranged at the open position 2A to reach the closed position 2B. Therefore, after the baffle 2 is arranged at the closed position 2B, the motor 31 is further driven in a plurality of steps. As a result, the baffle 2 is pressed from the closed position 2B in the direction further approaching the seal plate portion 14, and the elastic member 20 is further deformed. This makes the closing of the opening 3 more reliable. Here, if the motor 31 is further driven in a plurality of steps after the baffle 2 is arranged at the closed position 2B, step-out occurs in the motor 31, so that the baffle 2 tends to flutter due to the step-out. In response to such a problem, in this example, in the state where the baffle 2 is arranged at the closed position 2B, the second tooth 69 of the output gear 39 comes into contact with the outer peripheral surface 60a of the arcuate outer peripheral portion 60, and the output gear 39 Is prevented from rotating in the first rotation direction B1 that opens the baffle 2. Therefore, it is possible to prevent the baffle 2 from fluttering due to the step-out generated in the motor 31.

また、バッフル２が閉位置２Ｂに配置されることによって弾性変形した弾性部材２０の形状復帰力は、バッフル２を開く方向に出力歯車３９を回転させる力として作用する。すなわち、弾性部材２０の形状復帰力は出力歯車３９を第１回転方向Ｂ１に回転させる力として作用する。これに対して、本例では、バッフル２が閉位置２Ｂに配置された状態では、出力歯車３９の第２歯６９が円弧状外周部６０の外周面６０ａに当接し、出力歯車３９がバッフル２を開く第１回転方向Ｂ１に回転することが阻止されている。従って、本例の冷気ダンパ１では、弾性部材２０の形状復帰力によってバッフル２が閉位置２Ｂから開口部３を開く方向に移動することがない。さらに、出力歯車３９がバッフル２を開く第２回転方向に回転することが阻止されているので、開位置２Ａに配置されたバッフル２が流体圧を受けてばたつくことが抑制される。 Further, the shape restoration force of the elastic member 20 elastically deformed by arranging the baffle 2 at the closed position 2B acts as a force for rotating the output gear 39 in the direction of opening the baffle 2. That is, the shape returning force of the elastic member 20 acts as a force for rotating the output gear 39 in the first rotation direction B1. On the other hand, in this example, in the state where the baffle 2 is arranged at the closed position 2B, the second tooth 69 of the output gear 39 comes into contact with the outer peripheral surface 60a of the arcuate outer peripheral portion 60, and the output gear 39 is in contact with the outer peripheral surface 60a. It is prevented from rotating in the first rotation direction B1 to open. Therefore, in the cold air damper 1 of this example, the baffle 2 does not move from the closed position 2B in the direction of opening the opening 3 due to the shape restoring force of the elastic member 20. Further, since the output gear 39 is prevented from rotating in the second rotation direction in which the baffle 2 is opened, the baffle 2 arranged at the open position 2A is prevented from fluttering due to the fluid pressure.

次に、開口部３を開く際には、冷気ダンパ１はモータ３１を規定のステップ数だけ、開口部３を閉じる際とは反対の回転方向に駆動する。規定のステップ数は、閉位置２Ｂに配置されているバッフル２を開位置２Ａに到達させるステップ数である。これにより、駆動歯車３６は第１回転方向Ａ１に回転する。 Next, when the opening 3 is opened, the cold air damper 1 drives the motor 31 by a predetermined number of steps in the direction of rotation opposite to that when the opening 3 is closed. The specified number of steps is the number of steps for causing the baffle 2 arranged at the closed position 2B to reach the open position 2A. As a result, the drive gear 36 rotates in the first rotation direction A1.

駆動歯車３６が回転を開始すると、欠歯歯車３８の歯部３８ａにおいて最も円弧状外周部６０の側に位置する第１歯３８ｂ（第１回転方向Ａ１の前端の歯）は、出力歯車３９の第２歯６９を越えて、第１歯６８と第２歯６９の間に噛合する。これにより、出力歯車３９は第１回転方向Ｂ１への回転を開始する。出力歯車３９が第１回転方向Ｂ１に回転すると、出力歯車３９の出力軸６ａに連結されたバッフル２は、閉位置２Ｂから開位置２Ａに向う開方向Ｏに回転する。 When the drive gear 36 starts rotating, the first tooth 38b (the front end tooth in the first rotation direction A1) located on the most arcuate outer peripheral portion 60 side of the tooth portion 38a of the missing tooth gear 38 becomes the output gear 39. Beyond the second tooth 69, it meshes between the first tooth 68 and the second tooth 69. As a result, the output gear 39 starts rotating in the first rotation direction B1. When the output gear 39 rotates in the first rotation direction B1, the baffle 2 connected to the output shaft 6a of the output gear 39 rotates in the open direction O from the closed position 2B toward the open position 2A.

（作用効果）
本例では、駆動歯車３６の回転角度範囲を規定するための回転規制部５５は、ケース８の底板部２５からからＸ方向に突出して先端部分に度当たり部分５９ａ、５９ｂを備えるストッパ部５６と、ストッパ部５６の根元部分で外側に張り出す補強部５７（第１周方向補強部５７ａ、径方向外側補強部５７ｂ、第２周方向補強部５７ｃ、および径方向内側補強部５７ｇ）を備える。また、補強部５７の側面５７０は、底板部２５と反対側の端部が
ストッパ部５６の側壁５６０に連続し、補強部５７の側面５７０は、底板部２５側の端部が底板部２５に連続し、一部は、底板部２５の台座部分４２（載置面４２ａ）に連続する。従って、駆動歯車３６の回転を規制する毎に駆動歯車３６の当接部（円弧溝５４の壁面部分５４ａ、５４ｂ）とストッパ部５６の度当たり部分５９ａ、５９ｂとの衝突が繰り返されて、ストッパ部５６の基端側（載置面４２ａの側）に応力が頻繁に発生する場合でも、補強部５７によって、ストッパ部５６の基端側（根元部分）に亀裂などの破損が発生することを防止或いは抑制できる。 (Action effect)
In this example, the rotation restricting portion 55 for defining the rotation angle range of the drive gear 36 is a stopper portion 56 that protrudes in the X direction from the bottom plate portion 25 of the case 8 and has prescription portions 59a and 59b at the tip portions. A reinforcing portion 57 (first circumferential reinforcing portion 57a, radial outer reinforcing portion 57b, second circumferential reinforcing portion 57c, and radial inner reinforcing portion 57g) is provided at the root portion of the stopper portion 56. Further, the side surface 570 of the reinforcing portion 57 has an end portion opposite to the bottom plate portion 25 continuous with the side wall 560 of the stopper portion 56, and the side surface 570 of the reinforcing portion 57 has an end portion on the bottom plate portion 25 side of the bottom plate portion 25. It is continuous, and a part of it is continuous with the pedestal portion 42 (mounting surface 42a) of the bottom plate portion 25. Therefore, every time the rotation of the drive gear 36 is restricted, the collisions between the contact portions (wall surface portions 54a and 54b of the arc groove 54) of the drive gear 36 and the perforated portions 59a and 59b of the stopper portion 56 are repeated, and the stopper Even if stress is frequently generated on the base end side (the side of the mounting surface 42a) of the portion 56, the reinforcing portion 57 may cause damage such as cracks on the base end side (root portion) of the stopper portion 56. It can be prevented or suppressed.

また、補強部５７において、第１周方向補強部５７ａ、径方向外側補強部５７ｂ、および第２周方向補強部５７ｃは各々、底上げ部５７ｄ、５７ｅ、５７ｆを備えているため、ストッパ部５６において補強部５７から突出している寸法が短い。このため、ストッパ部５６の先端側の強度が大であるので、ストッパ部５６に亀裂などの破損が発生することを防止或いは抑制できる。 Further, in the reinforcing portion 57, since the first circumferential reinforcing portion 57a, the radial outer reinforcing portion 57b, and the second circumferential reinforcing portion 57c each include bottom raising portions 57d, 57e, and 57f, the stopper portion 56 The dimension protruding from the reinforcing portion 57 is short. Therefore, since the strength of the tip side of the stopper portion 56 is high, it is possible to prevent or suppress the occurrence of damage such as cracks in the stopper portion 56.

また、本例では、補強部５７として、軸線Ｌ１回りをストッパ部５６から周方向に張り出す第１周方向補強部５７ａと第２周方向補強部５７ｃを備える。ここで、駆動歯車３６の当接部（円弧溝５４の壁面部分５４ａ、５４ｂ）は、周方向からストッパ部５６に衝突するので、ストッパ部５６には、衝突の衝撃が周方向に加わりやすい。従って、補強部５７がストッパ部５６から周方向に張り出す補強部（第１周方向補強部５７ａおよび第２周方向補強部５７ｃ）を備えれば、ストッパ部５６と駆動歯車３６の当接部（円弧溝５４の壁面部分５４ａ、５４ｂ）との当接によって回転規制部５５が損傷することを抑制できる。 Further, in this example, the reinforcing portion 57 includes a first circumferential reinforcing portion 57a and a second circumferential reinforcing portion 57c that project around the axis L1 in the circumferential direction from the stopper portion 56. Here, since the contact portions (wall surface portions 54a and 54b of the arc groove 54) of the drive gear 36 collide with the stopper portion 56 from the circumferential direction, the impact of the collision is likely to be applied to the stopper portion 56 in the circumferential direction. Therefore, if the reinforcing portion 57 is provided with a reinforcing portion (first circumferential reinforcing portion 57a and second circumferential reinforcing portion 57c) protruding from the stopper portion 56 in the circumferential direction, the contact portion between the stopper portion 56 and the drive gear 36 It is possible to prevent the rotation restricting portion 55 from being damaged by contact with (the wall surface portions 54a and 54b of the arc groove 54).

さらに、本例では、補強部５７として、ストッパ部５６から外周側に張り出す径方向外側補強部５７ｂを備える。ここで、駆動歯車３６の当接部（円弧溝５４の壁面部分５４ａ、５４ｂ）がストッパ部５６に衝突した場合には、衝突の衝撃の分力が、回転規制部５５の径方向にも作用する。従って、補強部５７がストッパ部５６から径方向の外周側に張り出す径方向外側補強部５７ｂを備えていれば、ストッパ部５６と当接部との当接によって回転規制部５５が損傷することを、より、抑制できる。 Further, in this example, as the reinforcing portion 57, a radial outer reinforcing portion 57b projecting from the stopper portion 56 to the outer peripheral side is provided. Here, when the contact portions (wall surface portions 54a and 54b of the arc groove 54) of the drive gear 36 collide with the stopper portion 56, the component force of the impact of the collision also acts on the radial direction of the rotation restricting portion 55. To do. Therefore, if the reinforcing portion 57 includes the radial outer reinforcing portion 57b protruding from the stopper portion 56 to the outer peripheral side in the radial direction, the rotation restricting portion 55 is damaged by the contact between the stopper portion 56 and the abutting portion. Can be more suppressed.

また、本例では、ストッパ部５６と第１周方向補強部５７ａとはなめらかな凹曲面５５ａで接続されている。また、ストッパ部５６と径方向外側補強部５７ｂとはなめらかな凹曲面５５ｂで接続されている。さらに、ストッパ部５６と第２周方向補強部５７ｃとはなめらかな凹曲面５５ｃで接続されている。また、補強部５７と台座部分４２（載置面４２ａ）との間等は、なめらかな凹曲面５５ｄ等で接続されている。従って、ストッパ部５６における第１周方向補強部５７ａとの境界部分、ストッパ部５６における径方向外側補強部５７ｂとの境界部分、ストッパ部５６における第２周方向補強部５７ｃとの境界部分、補強部５７における底板部２５の載置面４２ａ等との間の境界部分に応力が発生した場合でも、応力の集中を緩和でき、これらの境界部分に亀裂などの損傷が発生することを防止できる。 Further, in this example, the stopper portion 56 and the first circumferential reinforcing portion 57a are connected by a smooth concave curved surface 55a. Further, the stopper portion 56 and the radial outer reinforcing portion 57b are connected by a smooth concave curved surface 55b. Further, the stopper portion 56 and the second circumferential reinforcing portion 57c are connected by a smooth concave curved surface 55c. Further, the reinforcing portion 57 and the pedestal portion 42 (mounting surface 42a) are connected by a smooth concave curved surface 55d or the like. Therefore, the boundary portion of the stopper portion 56 with the first circumferential reinforcing portion 57a, the boundary portion of the stopper portion 56 with the radial outer reinforcing portion 57b, the boundary portion of the stopper portion 56 with the second circumferential reinforcing portion 57c, and reinforcement. Even when stress is generated at the boundary portion between the bottom plate portion 25 and the mounting surface 42a of the portion 57, the concentration of stress can be relaxed and damage such as cracks can be prevented from occurring at these boundary portions.

さらに、本例では、ケース８が樹脂による一体成型品であり、回転規制部５５のストッパ部５６と補強部５７が一体に成型されるので、ストッパ部５６と補強部５７との間の強度を確保できる。 Further, in this example, since the case 8 is an integrally molded product made of resin and the stopper portion 56 and the reinforcing portion 57 of the rotation restricting portion 55 are integrally molded, the strength between the stopper portion 56 and the reinforcing portion 57 can be increased. Can be secured.

また、本例では、度当たり部分５９ａ、５９ｂが、それぞれ軸線Ｌ１と平行で径方向に延びる平面なので、駆動歯車３６の当接部（円弧溝５４の壁面部分５４ａ、５４ｂ）が度当たり部分５９ａ、５９ｂに当接したときに、駆動歯車３６が回転する角度範囲を正確に規定できる。また、駆動歯車３６の当接部（円弧溝５４の壁面部分５４ａ、５４ｂ）も軸線Ｌ１と平行で径方向に延びる平面なので、当接部（円弧溝５４の壁面部分５４ａ、５４
ｂ）が度当たり部分５９ａ、５９ｂに当接したときに、駆動歯車３６が回転する角度範囲を正確に規定できる。さらに、駆動歯車３６の当接部（円弧溝５４の壁面部分５４ａ、５４ｂ）と度当たり部分５９ａ、５９ｂとが当接を繰り返した場合でも、これらが両方とも平面なので、摩耗を抑制することができる。よって、駆動歯車３６の当接部（円弧溝５４の壁面部分５４ａ、５４ｂ）と度当たり部分５９ａ、５９ｂとが当接を繰り返した場合でも、摩耗によって駆動歯車３６の回転角度範囲が変化することを抑制できる。 Further, in this example, since the perforated portions 59a and 59b are planes extending in the radial direction parallel to the axis L1, the contact portions (wall surface portions 54a and 54b of the arc groove 54) of the drive gear 36 are perimeter portions 59a. , The angle range in which the drive gear 36 rotates when it comes into contact with 59b can be accurately defined. Further, since the contact portion (wall surface portion 54a, 54b of the arc groove 54) of the drive gear 36 is also a plane extending in the radial direction parallel to the axis L1, the contact portion (wall surface portion 54a, 54 of the arc groove 54) is also provided.
The angle range in which the drive gear 36 rotates when b) comes into contact with the perforated portions 59a and 59b can be accurately defined. Further, even when the contact portions (wall surface portions 54a and 54b of the arc groove 54) of the drive gear 36 and the degree contact portions 59a and 59b repeatedly contact each other, since both of them are flat, wear can be suppressed. it can. Therefore, even when the contact portions (wall surface portions 54a and 54b of the arc groove 54) of the drive gear 36 and the degree contact portions 59a and 59b repeatedly contact each other, the rotation angle range of the drive gear 36 changes due to wear. Can be suppressed.

さらに、本例では、ケース８に給電ケーブル４５を案内する案内壁４７が設けられており、案内壁４７が、第３支軸４３を挟んで第２支軸４１とは反対側に位置する。従って、給電ケーブル４５を駆動歯車３６および第２歯車３５と干渉しない領域（ケーブル通路４８）で引き回すことができる。また、案内壁４７と補強部５７とが第１周方向補強部５７ａを介して連続するので、案内壁４７の剛性を高めることができる。さらに、回転規制部５５は、第３支軸４３の軸線Ｌ１回りにおいて、第２支軸４１と案内壁４７との間の角度範囲に位置するので、第２支軸４１に支持される第２歯車３５と回転規制部５５とを互いに干渉しない位置に配置できる。 Further, in this example, the case 8 is provided with a guide wall 47 for guiding the power feeding cable 45, and the guide wall 47 is located on the opposite side of the third support shaft 43 from the second support shaft 41. Therefore, the power supply cable 45 can be routed in a region (cable passage 48) that does not interfere with the drive gear 36 and the second gear 35. Further, since the guide wall 47 and the reinforcing portion 57 are continuous via the first circumferential direction reinforcing portion 57a, the rigidity of the guide wall 47 can be increased. Further, since the rotation control unit 55 is located in the angle range between the second support shaft 41 and the guide wall 47 around the axis L1 of the third support shaft 43, the second support shaft 41 is supported by the second support shaft 41. The gear 35 and the rotation restricting portion 55 can be arranged at positions where they do not interfere with each other.

ここで、本例では、回転規制部５５が、出力歯車３９の前段の駆動歯車３６の回転角度範囲を規定するので、出力歯車３９が回転する角度範囲を精度よく規定できる。 Here, in this example, since the rotation regulation unit 55 defines the rotation angle range of the drive gear 36 in the front stage of the output gear 39, the angle range in which the output gear 39 rotates can be accurately defined.

なお、補強部５７が備える延設部分（底上げ部５７ｄ、５７ｅ、５７ｆ）は、第１周方向補強部５７ａおよび第２周方向補強部５７ｃだけでもよい。また、補強部５７が備える延設部分は第１周方向補強部５７ａおよび第２周方向補強部５７ｃのいずれか一方だけでもよい。 The extension portions (bottom raising portions 57d, 57e, 57f) provided in the reinforcing portion 57 may be only the first circumferential direction reinforcing portion 57a and the second circumferential direction reinforcing portion 57c. Further, the extension portion provided in the reinforcing portion 57 may be only one of the first circumferential reinforcing portion 57a and the second circumferential reinforcing portion 57c.

［実施の形態２］
図１５は、本発明の実施の形態２に係るギアユニット１０の説明図であり、蓋を省略した状態における斜視図に相当する。図１６は、図１５に示す第２駆動歯車９７に対する回転規制部５５等の説明図である。図１７は、図１５に示す第２駆動歯車９７をＸ方向の第２方向Ｘ２からみた斜視図である。図１８は、図１５に示すケース８の平面図である。なお、本形態の基本的な構成は、実施の形態１と同様であるため、共通する機能を有する部分には同一の符号を付してそれらの詳細な説明は省略する。 [Embodiment 2]
FIG. 15 is an explanatory view of the gear unit 10 according to the second embodiment of the present invention, and corresponds to a perspective view in a state where the lid is omitted. FIG. 16 is an explanatory view of a rotation regulating unit 55 and the like for the second drive gear 97 shown in FIG. FIG. 17 is a perspective view of the second drive gear 97 shown in FIG. 15 as viewed from the second direction X2 in the X direction. FIG. 18 is a plan view of the case 8 shown in FIG. Since the basic configuration of this embodiment is the same as that of the first embodiment, the parts having common functions are designated by the same reference numerals, and detailed description thereof will be omitted.

図１５に示すギアユニット１０は、実施の形態１と同様、冷気ダンパ１においてバッフル２を駆動する。ギアユニット１０は、ケース８と、ケース８に収容された駆動機構６とを有しており、モータ３１の回転は、第１歯車９１、第２歯車９２、第３歯車９３を介して第１駆動歯車９６に伝達される。また、第１駆動歯車９６の回転は、扇形の出力歯車９８に伝達される。本形態において、出力歯車９８として、同一の出力歯車用支軸８１（図１８参照）に２つの扇形歯車９８１、９８２が回転可能に支軸されており、２つの扇形歯車９８１、９８２の各々にバッフル２が連結される。従って、本形態のギアユニット１０は、２つのバッフル２を駆動可能である。 The gear unit 10 shown in FIG. 15 drives the baffle 2 in the cold air damper 1 as in the first embodiment. The gear unit 10 has a case 8 and a drive mechanism 6 housed in the case 8, and the rotation of the motor 31 is first via the first gear 91, the second gear 92, and the third gear 93. It is transmitted to the drive gear 96. Further, the rotation of the first drive gear 96 is transmitted to the fan-shaped output gear 98. In this embodiment, as the output gear 98, two fan-shaped gears 981 and 982 are rotatably supported on the same output gear support shaft 81 (see FIG. 18), and each of the two fan-shaped gears 981 and 982 has a rotatably supported shaft. The baffle 2 is connected. Therefore, the gear unit 10 of this embodiment can drive two baffles 2.

図１６に示すように、第１駆動歯車９６は、ケース８の底板部２５からＸ方向の第１方向Ｘ１に突出した支軸８２に回転可能に支持されている。第１駆動歯車９６は、支軸８２が嵌る第１円筒部９６０と、第１円筒部９６０から径方向外側に突出した円環状突出部９６１と、第１円筒部９６０より径方向外側で円環状突出部９６１からＸ方向の第１方向Ｘ１に突出した第２円筒部９６２と、円環状突出部９６１から第２円筒部９６２を通ってＸ方向の第１方向Ｘ１に突出した扇形歯車９６３とを有している。円環状突出部９６１の外周面には歯部９６１ａが形成されている。このため、モータ３１の回転が歯部９６１ａを介して第１駆動歯車９６に伝達された際、第１駆動歯車９６の回転は、扇形歯車９６３が扇形歯車９８１と噛み合った際に扇形歯車９８１に伝達される。扇形歯車９８１において
、歯部９８１ａは、軸方向において分厚く形成されているのに対して、歯部９８１ｂは、軸方向において薄く形成されている。従って、歯部９８１ｂが第１駆動歯車９６に乗り上げたとき、歯部９８１ｂが第１駆動歯車９６の第２円筒部９６２の外周面に当接して扇形歯車９８１の無駄な回転を阻止するようになっている。 As shown in FIG. 16, the first drive gear 96 is rotatably supported by a support shaft 82 projecting from the bottom plate portion 25 of the case 8 in the first direction X1 in the X direction. The first drive gear 96 includes a first cylindrical portion 960 into which the support shaft 82 fits, an annular protrusion 961 protruding radially outward from the first cylindrical portion 960, and an annular protrusion radially outward from the first cylindrical portion 960. A second cylindrical portion 962 protruding from the protruding portion 961 in the first direction X1 in the X direction, and a fan-shaped gear 963 protruding from the annular protruding portion 961 through the second cylindrical portion 962 in the first direction X1 in the X direction. Have. A tooth portion 961a is formed on the outer peripheral surface of the annular protrusion 961. Therefore, when the rotation of the motor 31 is transmitted to the first drive gear 96 via the tooth portion 961a, the rotation of the first drive gear 96 becomes the fan-shaped gear 981 when the fan-shaped gear 963 meshes with the fan-shaped gear 981. Be transmitted. In the fan-shaped gear 981, the tooth portion 981a is formed thick in the axial direction, whereas the tooth portion 981b is formed thin in the axial direction. Therefore, when the tooth portion 981b rides on the first drive gear 96, the tooth portion 981b abuts on the outer peripheral surface of the second cylindrical portion 962 of the first drive gear 96 to prevent unnecessary rotation of the fan-shaped gear 981. It has become.

本形態において、第１駆動歯車９６に対してＸ方向の第２方向Ｘ２に第２駆動歯車９７が重ねて配置されており、第２駆動歯車９７は、第１駆動歯車９６と同様、支軸８２に回転可能に支持されている。 In this embodiment, the second drive gear 97 is arranged so as to overlap the first drive gear 96 in the second direction X2 in the X direction, and the second drive gear 97 is a support shaft like the first drive gear 96. It is rotatably supported by 82.

図１６および図１７に示すように、第２駆動歯車９７は、支軸８２が嵌る第１円筒部９７０と、第１円筒部９７０から径方向外側に突出した略長円形状の円環状突出部９７１と、第１円筒部９７０の径方向外側で円環状突出部９７１からＸ方向の第１方向Ｘ１に突出した扇形の係合突起９７３とが設けられている。また、円環状突出部９７１からＸ方向の第２方向Ｘ２に向けて第２円筒部９７４が形成されており、第２円筒部９７４は、円環状突出部９７１の円弧状の外縁から連続するように突出している。かかる第２駆動歯車９７は、係合突起９７３が第１駆動歯車９６に形成された扇型の開口部９６５に嵌るように、第１駆動歯車９６に重ねて配置される。従って、第１駆動歯車９６と第２駆動歯車９７とは一体となって支軸８２の軸線Ｌ８１周りに回転する。その際、扇形歯車９７２が扇形歯車９８２と噛み合った際には扇形歯車９８２が出力歯車用支軸８１周りに回転する。扇形歯車９８２において、歯部９８２ａは、軸方向において分厚く形成されているのに対して、歯部９８２ｂは、軸方向において薄く形成されている。従って、歯部９８２ｂが第２駆動歯車９７に乗り上げたとき、歯部９８２ｂが第２駆動歯車９７の第１円筒部９７０の外周面に当接して扇形歯車９８２の無駄な回転を阻止するようになっている。 As shown in FIGS. 16 and 17, the second drive gear 97 has a first cylindrical portion 970 into which the support shaft 82 is fitted and a substantially oval-shaped annular protrusion protruding radially outward from the first cylindrical portion 970. 971 and a fan-shaped engaging protrusion 973 protruding in the first direction X1 in the X direction from the annular protrusion 971 on the radial outer side of the first cylindrical portion 970 are provided. Further, a second cylindrical portion 974 is formed from the annular protrusion 971 toward the second direction X2 in the X direction, and the second cylindrical portion 974 is continuous from the arcuate outer edge of the annular protrusion 971. It protrudes into. The second drive gear 97 is arranged so as to overlap the first drive gear 96 so that the engagement protrusion 973 fits into the fan-shaped opening 965 formed in the first drive gear 96. Therefore, the first drive gear 96 and the second drive gear 97 are integrally rotated around the axis L81 of the support shaft 82. At that time, when the fan-shaped gear 972 meshes with the fan-shaped gear 982, the fan-shaped gear 982 rotates around the output gear support shaft 81. In the fan-shaped gear 982, the tooth portion 982a is formed thick in the axial direction, whereas the tooth portion 982b is formed thin in the axial direction. Therefore, when the tooth portion 982b rides on the second drive gear 97, the tooth portion 982b abuts on the outer peripheral surface of the first cylindrical portion 970 of the second drive gear 97 to prevent unnecessary rotation of the fan-shaped gear 982. It has become.

また、ケース８には、板状バネ９９の両端が保持されており、この状態で板状バネ９９は、第２駆動歯車９７の円環状突出部９７１の外周面に当接している。円環状突出部９７１は、周方向において外径がカム状に変化している。このため、円環状突出部９７１の大径部分が板状バネ９９に当接した場合には、第２駆動歯車９７に大きな負荷が加わるので、第２駆動歯車９７の回転が抑制される。 Further, both ends of the plate-shaped spring 99 are held in the case 8, and in this state, the plate-shaped spring 99 is in contact with the outer peripheral surface of the annular protrusion 971 of the second drive gear 97. The outer diameter of the annular protrusion 971 changes in a cam shape in the circumferential direction. Therefore, when the large-diameter portion of the annular protrusion 971 comes into contact with the plate-shaped spring 99, a large load is applied to the second drive gear 97, so that the rotation of the second drive gear 97 is suppressed.

ここで、支軸８２は、ケース８の底板部２５からＸ方向の第１方向Ｘ１に突出した基端側軸部８２１と、基端側軸部８２１からＸ方向の第１方向Ｘ１に突出した先端側軸部８２２とからなる。基端側軸部８２１は先端側軸部８２２より太く、第２駆動歯車９７を回転可能に支持する。先端側軸部８２２は、第１駆動歯車９６を回転可能に支持する。ケース８の底板部２５には、支軸８２を囲むように円環状の台座部分８４が形成されており、台座部分８４のＸ方向の第１方向Ｘ１の面は、第２駆動歯車９７が載置される載置面８４ａになっている。本形態でも、実施の形態１と同様、ケース８および第２駆動歯車９７は樹脂製である。 Here, the support shaft 82 protrudes from the bottom plate portion 25 of the case 8 in the first direction X1 in the X direction, and from the proximal end side shaft portion 821 in the first direction X1 in the X direction. It is composed of a tip side shaft portion 822. The base end side shaft portion 821 is thicker than the tip end side shaft portion 822 and rotatably supports the second drive gear 97. The tip side shaft portion 822 rotatably supports the first drive gear 96. An annular pedestal portion 84 is formed on the bottom plate portion 25 of the case 8 so as to surround the support shaft 82, and the second drive gear 97 is mounted on the surface of the pedestal portion 84 in the first direction X1 in the X direction. It is a mounting surface 84a to be placed. Also in this embodiment, the case 8 and the second drive gear 97 are made of resin as in the first embodiment.

図１６、図１７および図１８に示すように、本形態でも、実施の形態１と同様、第２駆動歯車９７が支軸８２の軸線回りを回転する角度範囲を規定する回転規制機構５０が構成されている。より具体的には、第２駆動歯車９７は、ケース８の底板部２５と対向するＸ方向の第２方向Ｘ２の端面（対向面）に、軸線Ｌ８２の回りに所定の角度範囲に渡る一定幅の円弧溝（溝部）５４を備える。円弧溝５４の内壁面において周方向の端をそれぞれ規定している壁面部分５４ａ、５４ｂは、軸線Ｌ８２と平行で径方向に延びる平面である。壁面部分５４ａ、５４ｂは、ケース８に設けられた回転規制部５５とともに、第２駆動歯車９７の回転角度範囲を規制する回転規制機構５０を構成する。 As shown in FIGS. 16, 17, and 18, as in the first embodiment, the rotation regulation mechanism 50 that defines the angle range in which the second drive gear 97 rotates around the axis of the support shaft 82 is configured in this embodiment as well. Has been done. More specifically, the second drive gear 97 has a constant width over a predetermined angular range around the axis L82 on the end surface (opposing surface) of the second direction X2 in the X direction facing the bottom plate portion 25 of the case 8. The arc groove (groove portion) 54 is provided. The wall surface portions 54a and 54b that define the circumferential ends of the inner wall surface of the arc groove 54 are planes that are parallel to the axis L82 and extend in the radial direction. The wall surface portions 54a and 54b, together with the rotation regulating portion 55 provided on the case 8, constitute a rotation regulating mechanism 50 that regulates the rotation angle range of the second drive gear 97.

本形態において、回転規制部５５は、ケース８の底板部２５から支軸８２と同一方向に突出したストッパ部５６を有しており、ストッパ部５６は、支軸８２の軸線Ｌ８２回りを
周方向に延びる略円弧形状の突条である。従って、ストッパ部５６は、第２駆動歯車９７の第１円筒部９７０に支軸８２が挿入されたときに、後述する補強部５７より第１方向Ｘ１の先端部分が円弧溝５４に挿入される。 In the present embodiment, the rotation restricting portion 55 has a stopper portion 56 protruding from the bottom plate portion 25 of the case 8 in the same direction as the support shaft 82, and the stopper portion 56 is circumferentially around the axis L82 of the support shaft 82. It is a ridge with a substantially arc shape that extends to. Therefore, when the support shaft 82 is inserted into the first cylindrical portion 970 of the second drive gear 97, the stopper portion 56 is inserted into the arc groove 54 from the reinforcing portion 57 described later in the tip portion in the first direction X1. ..

ストッパ部５６において円弧溝５４に挿入される先端部分の周方向の両端には、壁面部分５４ａ、５４ｂに当接可能な度当たり部分５９ａ、５９ｂが設けられている。度当たり部分５９ａは、円弧溝５４の内壁面のうち、周方向の一方の端を規定する壁面部分５４ａと当接して駆動歯車３６の回転を規制する。度当たり部分５９ｂは、円弧溝５４の内壁面のうち、周方向の他方の端を規定する壁面部分５４ｂと当接して駆動歯車３６の回転を規制する。各度当たり部分５９ａ、５９ｂは、それぞれ軸線Ｌ８２回りの周方向に向いた平面である。第２駆動歯車９７は、度当たり部分５９ａが円弧溝５４の一方の壁面部分５４ａに当接する位置から、度当たり部分５９ｂが円弧溝５４の他方の壁面部分５４ｂに当接する位置までの間でその回転が許容される。 At both ends in the circumferential direction of the tip portion of the stopper portion 56 that is inserted into the arc groove 54, perforated portions 59a and 59b that can come into contact with the wall surface portions 54a and 54b are provided. The per-degree portion 59a abuts on the wall surface portion 54a that defines one end in the circumferential direction of the inner wall surface of the arc groove 54 to regulate the rotation of the drive gear 36. The per-degree portion 59b comes into contact with the wall surface portion 54b that defines the other end in the circumferential direction of the inner wall surface of the arc groove 54 to regulate the rotation of the drive gear 36. The portions 59a and 59b per degree are planes oriented in the circumferential direction around the axis L82, respectively. The second drive gear 97 has a degree portion 59a from a position where the degree portion 59a abuts on one wall surface portion 54a of the arc groove 54 to a position where the degree portion 59b abuts on the other wall surface portion 54b of the arc groove 54. Rotation is allowed.

また、回転規制部５５は、後述するように、Ｘ方向（軸線Ｌ８２方向）から見た場合にストッパ部５６の側壁５６０から外側に張り出した補強部５７を備える。本形態において、補強部５７としては、軸線Ｌ８２回りをストッパ部５６の側壁５６０の根元側から周方向の一方側に張り出すように突出した第１周方向補強部５７ｒと、ストッパ部５６の側壁５６０の根元側から径方向外側に張り出すように突出した径方向外側補強部５７ｓと、軸線Ｌ８２回りをストッパ部５６の側壁５６０の根元側から周方向の他方側に張り出すように突出した第２周方向補強部５７ｔとを備える。補強部５７（第１周方向補強部５７ｒ、径方向外側補強部５７ｓ、および第２周方向補強部５７ｔ）は各々、底板部２５とは反対側の端部がストッパ部５６の側壁５６０に連続し、底板部２５側の端部が底板部２５に連続している。従って、補強部５７は、ストッパ部５６を補強している。 Further, as will be described later, the rotation restricting portion 55 includes a reinforcing portion 57 projecting outward from the side wall 560 of the stopper portion 56 when viewed from the X direction (axis L82 direction). In the present embodiment, the reinforcing portion 57 includes a first circumferential reinforcing portion 57r projecting so as to project around the axis L82 from the root side of the side wall 560 of the stopper portion 56 to one side in the circumferential direction, and a side wall of the stopper portion 56. The radial outer reinforcing portion 57s projecting radially outward from the root side of the 560, and the second portion projecting around the axis L82 so as to project from the root side of the side wall 560 of the stopper portion 56 to the other side in the circumferential direction. It is provided with a two-circumferential reinforcing portion 57t. Each of the reinforcing portions 57 (first circumferential reinforcing portion 57r, radial outer reinforcing portion 57s, and second circumferential reinforcing portion 57t) has an end opposite to the bottom plate portion 25 continuous with the side wall 560 of the stopper portion 56. However, the end portion on the bottom plate portion 25 side is continuous with the bottom plate portion 25. Therefore, the reinforcing portion 57 reinforces the stopper portion 56.

ここで、補強部５７（第１周方向補強部５７ｒ、径方向外側補強部５７ｓ、および第２周方向補強部５７ｔ）の側面５７０は、全体が凹曲面または斜面になっている。すなわち、補強部５７の側面５７０全体が、軸線Ｌ８２に平行な面で切断したとき、凹状の円弧等の曲線、あるいは斜線になっている。本形態において、補強部５７（第１周方向補強部５７ｒ、径方向外側補強部５７ｓ、および第２周方向補強部５７ｔ）は、全体が凹曲面になっている。従って、補強部５７（第１周方向補強部５７ｒ、径方向外側補強部５７ｓ、および第２周方向補強部５７ｔ）は、底板部２５とは反対側の端部がストッパ部５６の側壁５６０になめらかに連続し、底板部２５側の端部が底板部２５になめらかに連続している。なお、ストッパ部５６の径方向内側で円弧状に延在する内周側壁面５６ａには補強部５７が形成されていない。 Here, the side surface 570 of the reinforcing portion 57 (the first circumferential reinforcing portion 57r, the radial outer reinforcing portion 57s, and the second circumferential reinforcing portion 57t) has a concave curved surface or an inclined surface as a whole. That is, when the entire side surface 570 of the reinforcing portion 57 is cut along a surface parallel to the axis L82, it becomes a curved line such as a concave arc or a diagonal line. In the present embodiment, the reinforcing portion 57 (the first circumferential reinforcing portion 57r, the radial outer reinforcing portion 57s, and the second circumferential reinforcing portion 57t) has a concave curved surface as a whole. Therefore, the reinforcing portion 57 (the first circumferential reinforcing portion 57r, the radial outer reinforcing portion 57s, and the second circumferential reinforcing portion 57t) has an end portion opposite to the bottom plate portion 25 on the side wall 560 of the stopper portion 56. It is smoothly continuous, and the end portion on the bottom plate portion 25 side is smoothly continuous with the bottom plate portion 25. The reinforcing portion 57 is not formed on the inner peripheral side wall surface 56a extending in an arc shape inside the stopper portion 56 in the radial direction.

本形態において、補強部５７（第１周方向補強部５７ｒ、径方向外側補強部５７ｓ、および第２周方向補強部５７ｔ）の軸線Ｌ８２方向の寸法は、台座部分８４の高さと等しく、補強部５７は台座部分８４の側面と繋がっている。 In the present embodiment, the dimensions of the reinforcing portion 57 (first circumferential reinforcing portion 57r, radial outer reinforcing portion 57s, and second circumferential reinforcing portion 57t) in the axis L82 direction are equal to the height of the pedestal portion 84, and the reinforcing portion 57 is connected to the side surface of the pedestal portion 84.

このように構成した場合も、実施の形態１と同様、第２駆動歯車９７の回転角度範囲を規定するための回転規制部５５は、ケース８の底板部２５からからＸ方向に突出して先端部分に度当たり部分５９ａ、５９ｂを備えるストッパ部５６と、ストッパ部５６の根元部分で外側に張り出す補強部５７（第１周方向補強部５７ｒ、径方向外側補強部５７ｓ、および第２周方向補強部５７ｔ）を備える。また、補強部５７の側面５７０は、底板部２５と反対側の端部がストッパ部５６の側壁５６０に連続し、補強部５７の側面５７０は、底板部２５側の端部が底板部２５に連続する。従って、駆動歯車３６の回転を規制する毎に駆動歯車３６の当接部（円弧溝５４の壁面部分５４ａ、５４ｂ）とストッパ部５６の度当たり部分５９ａ、５９ｂとの衝突が繰り返されて、ストッパ部５６の基端側（載置面４２ａの側）に応力が頻繁に発生する場合でも、補強部５７によって、ストッパ部５６の基端
側に亀裂などの破損が発生することを防止或いは抑制できる。 Even in this configuration, as in the first embodiment, the rotation regulating portion 55 for defining the rotation angle range of the second drive gear 97 protrudes from the bottom plate portion 25 of the case 8 in the X direction and is a tip portion. A stopper portion 56 having perforated portions 59a and 59b, and a reinforcing portion 57 protruding outward at the root portion of the stopper portion 56 (first circumferential reinforcing portion 57r, radial outer reinforcing portion 57s, and second circumferential reinforcement). A unit 57t) is provided. Further, the side surface 570 of the reinforcing portion 57 has an end portion opposite to the bottom plate portion 25 continuous with the side wall 560 of the stopper portion 56, and the side surface 570 of the reinforcing portion 57 has an end portion on the bottom plate portion 25 side of the bottom plate portion 25. Continuous. Therefore, every time the rotation of the drive gear 36 is restricted, the collisions between the contact portions (wall surface portions 54a and 54b of the arc groove 54) of the drive gear 36 and the perforated portions 59a and 59b of the stopper portion 56 are repeated, and the stopper Even when stress is frequently generated on the base end side of the portion 56 (the side of the mounting surface 42a), the reinforcing portion 57 can prevent or suppress damage such as cracks on the base end side of the stopper portion 56. ..

［実施の形態２の変形例１］
図１９は、本発明の実施の形態２の変形例１に係るギアユニット１０に設けた回転規制部５５の平面図である。実施の形態２では、ストッパ部５６の径方向内側で円弧状に延在する内周側壁面５６ａには補強部５７が形成されていなかったが、本形態では、内周側壁面５６ａにも補強部５７が径方向内側補強部５７ｕとして形成されている。従って、本形態では、ストッパ部５６の全周に補強部５７が形成されている。 [Modification 1 of Embodiment 2]
FIG. 19 is a plan view of the rotation regulating unit 55 provided in the gear unit 10 according to the first modification of the second embodiment of the present invention. In the second embodiment, the reinforcing portion 57 is not formed on the inner peripheral side wall surface 56a extending in the radial direction of the stopper portion 56 in an arc shape, but in the present embodiment, the reinforcing portion 57 is also reinforced on the inner peripheral side wall surface 56a. The portion 57 is formed as a radial inner reinforcing portion 57u. Therefore, in this embodiment, the reinforcing portion 57 is formed on the entire circumference of the stopper portion 56.

ここで、第１周方向補強部５７ｒ、径方向外側補強部５７ｓ、および第２周方向補強部５７ｔは、ケース８の底板部２５のうち、台座部分８４が形成されていない領域に形成されている。これに対して、径方向内側補強部５７ｕは、ケース８の底板部２５のうち、台座部分８４が形成されている領域に形成されている。また、径方向内側補強部５７ｕも、側面全体が凹曲面または斜面から形成されており、ストッパ部５６の側壁５６０や台座部分８４に対して段差を形成することなく連続している。本形態において、径方向内側補強部５７ｕは、側面全体が凹曲面からなるため、ストッパ部５６の側壁５６０や台座部分８４に対してなめらかに連続している。 Here, the first circumferential reinforcing portion 57r, the radial outer reinforcing portion 57s, and the second circumferential reinforcing portion 57t are formed in a region of the bottom plate portion 25 of the case 8 where the pedestal portion 84 is not formed. There is. On the other hand, the radial inner reinforcing portion 57u is formed in the region of the bottom plate portion 25 of the case 8 where the pedestal portion 84 is formed. Further, the radial inner reinforcing portion 57u is also formed on the entire side surface from a concave curved surface or a slope, and is continuous with the side wall 560 and the pedestal portion 84 of the stopper portion 56 without forming a step. In the present embodiment, since the entire side surface of the radial inner reinforcing portion 57u is formed of a concave curved surface, the radial inner reinforcing portion 57u is smoothly continuous with the side wall 560 and the pedestal portion 84 of the stopper portion 56.

また、径方向内側補強部５７ｕは、他の補強部５７（第１周方向補強部５７ｒ、径方向外側補強部５７ｓ、および第２周方向補強部５７ｔ）より軸線Ｌ８２方向の寸法が小さい。従って、径方向内側補強部５７ｕが第２駆動歯車９７と干渉するという事態が発生しない。 Further, the radial inner reinforcing portion 57u has a smaller dimension in the axis L82 direction than the other reinforcing portions 57 (first circumferential reinforcing portion 57r, radial outer reinforcing portion 57s, and second circumferential reinforcing portion 57t). Therefore, the situation where the radial inner reinforcing portion 57u interferes with the second drive gear 97 does not occur.

［実施の形態２の変形例２］
図２０は、本発明の実施の形態２の変形例２に係るギアユニット１０に設けた回転規制部５５の平面図である。実施の形態２では、軸線Ｌ８２方向からみたとき、補強部５７がストッパ部５６の角に対応する部分で外縁が角張っていたが、本形態では、図２０に示すように、軸線Ｌ８２方向からみたとき、補強部５７の外縁は、折れ曲がった個所が曲線からなる。このため、応力に集中が発生しにくいので、補強部５７はストッパ部５６を補強する効果が大きい。 [Modification 2 of Embodiment 2]
FIG. 20 is a plan view of the rotation regulating unit 55 provided in the gear unit 10 according to the second modification of the second embodiment of the present invention. In the second embodiment, when viewed from the axis L82 direction, the outer edge of the reinforcing portion 57 is angular at the portion corresponding to the corner of the stopper portion 56, but in this embodiment, as shown in FIG. 20, the reinforcing portion 57 is viewed from the axis L82 direction. At this time, the outer edge of the reinforcing portion 57 has a curved portion at a bent portion. Therefore, since it is difficult for stress to be concentrated, the reinforcing portion 57 has a great effect of reinforcing the stopper portion 56.

［その他の実施の形態］
なお、上記形態は、本発明の好適な実施の形態の例であるが、これに限定されるものではなく、本発明の要旨を逸脱しない範囲において、種々変形実施可能である。例えば、上述した実施の形態における冷気ダンパ１は、冷蔵庫用のダンパ装置であるが、必ずしも、冷蔵庫に用いられるダンパ装置に限定されるものではない。 [Other embodiments]
The above embodiment is an example of a preferred embodiment of the present invention, but the present invention is not limited to this, and various modifications can be made without departing from the gist of the present invention. For example, the cold air damper 1 in the above-described embodiment is a damper device for a refrigerator, but is not necessarily limited to the damper device used for a refrigerator.

また、上記実施に形態では、ケース８を支持部材とし、ケース８の底板部２５をベース部としたが、板状部材等を支持部材とし、その一部をベース部として利用したギアユニットに本発明を適用してもよい。 Further, in the above embodiment, the case 8 is used as a support member and the bottom plate portion 25 of the case 8 is used as a base portion, but this is a gear unit in which a plate-shaped member or the like is used as a support member and a part thereof is used as a base portion. The invention may be applied.

１・・・冷気ダンパ
２・・・バッフル
２Ｂ・・・バッフルの閉位置
３・・・開口部
５・・・フレーム
８・・・ケース
１０・・・ギアユニット
２０・・・弾性部材
３１・・・モータ
３５・・・第２歯車（第２の歯車）
３６・・・駆動歯車（歯車）
３７・・・大径歯車（平歯車）
３７ａ・・・大径歯車の歯部（第１歯部）
３７ｂ・・・対向面
３８・・・欠歯歯車
３８ａ・・・欠歯歯車の歯部（第２歯部）
３９・・・出力歯車（扇形歯車）
４１・・・第２支軸（第２支軸）
４２、８４・・・台座部分
４２ａ、８４ａ・・・載置面
４３・・・第３支軸（支軸）
４５・・・給電ケーブル
４７・・・案内壁
４７ａ・・・案内面
５０・・・回転規制機構
５１・・・筒部
５２・・・突出部
５４・・・円弧溝（溝部）
５４ａ・５４ｂ・・・壁面部分（当接部）
５５・・・回転規制部
５５ａ、５５ｂ、５５ｃ、５５ｅ、５５ｆ・・・凹曲面
５６・・・ストッパ部
５６ａ・・・内周側壁面
５７・・・補強部
５７ａ、５７ｒ・・・第１周方向補強部（周方向補強部）
５７ｂ、５７ｓ・・・径方向外側補強部
５７ｃ、５７ｔ・・・第２周方向補強部（周方向補強部）
５７ｄ、５７ｅ、５７ｆ・・・底上げ部
５７ｇ、５７ｕ・・・径方向内側補強部
５９ａ・５９ｂ・・・度当たり部分
６０・・・円弧状外周部（外周部）
６０ａ・・・円弧状外周部の外周面
６０ｂ・・・円弧状外周部の端面
６８・・・第１歯
６９・・・第２歯
９７・・・第２駆動歯車（歯車）
５６０・・・側壁
５７０・・・側面
Ｌ１、Ｌ８２・・・駆動歯車（歯車）の軸線 1 ... Cold air damper 2 ... Baffle 2B ... Baffle closing position 3 ... Opening 5 ... Frame 8 ... Case 10 ... Gear unit 20 ... Elastic member 31 ...・ Motor 35: 2nd gear (2nd gear)
36 ... Drive gear (gear)
37 ... Large diameter gear (spur gear)
37a: Tooth part of large diameter gear (first tooth part)
37b ... Facing surface 38 ... Missing gear 38a ... Tooth part of missing gear (second tooth part)
39 ... Output gear (fan gear)
41 ... 2nd support shaft (2nd support shaft)
42, 84 ... Pedestal part 42a, 84a ... Mounting surface 43 ... Third support shaft (support shaft)
45 ... Power supply cable 47 ... Guide wall 47a ... Guide surface 50 ... Rotation regulation mechanism 51 ... Cylinder 52 ... Protruding 54 ... Arc groove (groove)
54a ・ 54b ・ ・ ・ Wall surface (contact part)
55 ... Rotation control part 55a, 55b, 55c, 55e, 55f ... Concave curved surface 56 ... Stopper part 56a ... Inner peripheral side wall surface 57 ... Reinforcing part 57a, 57r ... First circumference Directional reinforcement (circumferential reinforcement)
57b, 57s ... Radial outer reinforcing portion 57c, 57t ... Second circumferential reinforcing portion (circumferential reinforcing portion)
57d, 57e, 57f ... Bottom raising portion 57g, 57u ... Radial inner reinforcing portions 59a / 59b ... Per degree portion 60 ... Arc-shaped outer peripheral portion (outer peripheral portion)
60a ... Outer peripheral surface of arc-shaped outer peripheral portion 60b ... End surface of arc-shaped outer peripheral portion 68 ... First tooth 69 ... Second tooth 97 ... Second drive gear (gear)
560 ... Side wall 570 ... Side L1, L82 ... Drive gear (gear) axis

Claims (20)

支持部材のベース部から突出した支軸と、
前記支軸によって回転可能に支持され、駆動源からの駆動力が伝達される歯車と、前記歯車が前記支軸の軸線回りを回転する角度範囲を規定する回転規制機構と、を有し、
前記回転規制機構は、前記歯車において前記軸線から外周側に離間する位置に設けられた当接部と、前記当接部に前記歯車の回転方向の前方から当接可能に前記支持部材に設けられた回転規制部と、を備え、
前記回転規制部は、前記ベース部から前記支軸と同一方向に突出して先端側に前記当接部が当接可能な度当たり部分を備えたストッパ部と、前記ストッパ部において前記度当たり部分より前記ベース部側の根元部分で前記軸線方向からみたときに前記ストッパ部の側壁から外側に張り出した部分からなる補強部と、を備え、
前記補強部の側面は、前記ベース部とは反対側の端部が前記ストッパ部の前記側壁に連続し、前記ベース部側の端部が前記ベース部に連続しており、
前記補強部は、前記ベース部とは反対側の端部と前記ベース部側の端部との間に、前記軸線方向に対して直交する方向に側面を向けて前記ベース部から前記支軸と同一方向に突出した底上げ部を備えていることを特徴とするギアユニット。 A support shaft protruding from the base of the support member,
It has a gear that is rotatably supported by the support shaft and transmits a driving force from a drive source, and a rotation control mechanism that defines an angle range in which the gear rotates around the axis of the support shaft.
The rotation regulation mechanism is provided on the support member so as to be able to contact the contact portion provided at a position separated from the axis line on the outer peripheral side of the gear and the contact portion from the front in the rotation direction of the gear. Equipped with a rotation control unit
The rotation restricting portion includes a stopper portion that protrudes from the base portion in the same direction as the support shaft and has a perforated portion on the tip end side capable of contacting the abutting portion, and the stopper portion from the perforated portion. The base portion on the base portion side is provided with a reinforcing portion formed of a portion protruding outward from the side wall of the stopper portion when viewed from the axial direction.
On the side surface of the reinforcing portion, the end portion on the side opposite to the base portion is continuous with the side wall of the stopper portion, and the end portion on the base portion side is continuous with the base portion .
The reinforcing portion is formed between the end portion on the side opposite to the base portion and the end portion on the base portion side with the side surface facing in a direction orthogonal to the axial direction from the base portion to the support shaft. A gear unit characterized by having a raised portion protruding in the same direction. 請求項１において、
前記補強部の前記側面は、前記ベース部とは反対側の端部で凹曲面または斜面になっていることを特徴とするギアユニット。 In claim 1,
A gear unit characterized in that the side surface of the reinforcing portion has a concave curved surface or an inclined surface at an end portion opposite to the base portion. 請求項１または２において、
前記補強部として、前記ストッパ部の前記側壁から前記軸線回りの周方向に張り出した周方向補強部を備えることを特徴とするギアユニット。 In claim 1 or 2,
A gear unit comprising, as the reinforcing portion, a circumferential reinforcing portion projecting from the side wall of the stopper portion in the circumferential direction around the axis. 請求項３において、
前記周方向補強部は、前記ベース部とは反対側の端部が前記ストッパ部の前記側壁になめらかに連続することを特徴とするギアユニット。 In claim 3,
The circumferential reinforcing portion is a gear unit characterized in that an end portion on the side opposite to the base portion smoothly continues to the side wall of the stopper portion. 請求項１から３のうちのいずれか一項において、
前記補強部として、前記ストッパ部の前記側壁から前記支軸から離間する径方向外側に
張り出した径方向外側補強部を備えることを特徴とするギアユニット。 In any one of claims 1 to 3,
The gear unit includes, as the reinforcing portion, a radial outer reinforcing portion projecting radially outward from the side wall of the stopper portion and away from the support shaft. 請求項５において、
前記径方向外側補強部は、前記ベース部とは反対側の端部が前記ストッパ部の前記側壁になめらかに連続することを特徴とするギアユニット。 In claim 5,
The radial outer reinforcing portion is a gear unit characterized in that an end portion on a side opposite to the base portion smoothly continues to the side wall of the stopper portion. 請求項１から６のうちのいずれか一項において、
前記度当たり部分は、前記軸線周りの周方向に向いた平面であることを特徴とするギアユニット。 In any one of claims 1 to 6,
The gear unit is characterized in that the perforated portion is a flat surface oriented in the circumferential direction around the axis. 請求項１から７のいずれか一項において、
前記ベース部は、前記支軸と同一方向に段状に突出して一部が、前記歯車が載置される載置面とされる台座部分を含み、
前記支軸および前記ストッパ部は、前記台座部分から突出していることを特徴とするギアユニット。 In any one of claims 1 to 7 ,
The base portion includes a pedestal portion that projects stepwise in the same direction as the support shaft and is partially used as a mounting surface on which the gear is mounted.
A gear unit characterized in that the support shaft and the stopper portion protrude from the pedestal portion. 請求項８において、
前記補強部の少なくとも一部は、前記ベース部側の端部が前記ベース部のうち、前記台座部分に連続していることを特徴とするギアユニット。 In claim 8 .
A gear unit characterized in that at least a part of the reinforcing portion has an end portion on the base portion side continuous with the pedestal portion of the base portion. 支持部材のベース部から突出した支軸と、
前記支軸によって回転可能に支持され、駆動源からの駆動力が伝達される歯車と、前記歯車が前記支軸の軸線回りを回転する角度範囲を規定する回転規制機構と、を有し、
前記回転規制機構は、前記歯車において前記軸線から外周側に離間する位置に設けられた当接部と、前記当接部に前記歯車の回転方向の前方から当接可能に前記支持部材に設けられた回転規制部と、を備え、
前記回転規制部は、前記ベース部から前記支軸と同一方向に突出して先端側に前記当接部が当接可能な度当たり部分を備えたストッパ部と、前記ストッパ部において前記度当たり部分より前記ベース部側の根元部分で前記軸線方向からみたときに前記ストッパ部の側壁から外側に張り出した部分からなる補強部と、を備え、
前記補強部の側面は、前記ベース部とは反対側の端部が前記ストッパ部の前記側壁に連続し、前記ベース部側の端部が前記ベース部に連続しており、
前記補強部は、側面全体が凹曲面または斜面に形成されており、
前記補強部は、前記ストッパ部から前記支軸が位置する径方向内側に張り出した径方向内側補強部を含んで前記ストッパ部の全周に形成されており、
前記径方向内側補強部は、前記補強部のうち、前記径方向内側補強部以外の補強部よりの前記軸線方向における寸法が小さいことを特徴とするギアユニット。 A support shaft protruding from the base of the support member,
It has a gear that is rotatably supported by the support shaft and transmits a driving force from a drive source, and a rotation control mechanism that defines an angle range in which the gear rotates around the axis of the support shaft.
The rotation regulation mechanism is provided on the support member so as to be able to contact the contact portion provided at a position separated from the axis line on the outer peripheral side of the gear and the contact portion from the front in the rotation direction of the gear. Equipped with a rotation control unit
The rotation restricting portion includes a stopper portion that protrudes from the base portion in the same direction as the support shaft and has a perforated portion on the tip end side capable of contacting the abutting portion, and the stopper portion from the perforated portion. The base portion on the base portion side is provided with a reinforcing portion formed of a portion protruding outward from the side wall of the stopper portion when viewed from the axial direction.
On the side surface of the reinforcing portion, the end portion on the side opposite to the base portion is continuous with the side wall of the stopper portion, and the end portion on the base portion side is continuous with the base portion.
The entire side surface of the reinforcing portion is formed as a concave curved surface or a slope .
The reinforcing portion is formed on the entire circumference of the stopper portion, including a radial inner reinforcing portion projecting inward in the radial direction from which the support shaft is located.
The radial inner reinforcing portion is a gear unit characterized in that the dimension of the reinforcing portion in the axial direction is smaller than that of the reinforcing portion other than the radial inner reinforcing portion. 請求項１０において、
前記補強部は、側面全体が凹曲面になっていることにより、前記補強部の前記ベース部とは反対側の端部が前記ストッパ部の前記側壁になめらかに連続し、前記ベース部側の端部が前記ベース部になめらかに連続していることを特徴とするギアユニット。 In claim 10 ,
Since the entire side surface of the reinforcing portion is a concave curved surface, the end portion of the reinforcing portion on the side opposite to the base portion smoothly continues to the side wall of the stopper portion, and the end on the base portion side. A gear unit characterized in that the portions are smoothly continuous with the base portion. 請求項１０または１１において、
前記軸線方向からみたとき、前記補強部の外縁は、折れ曲がった個所が曲線からなることを特徴とするギアユニット。 In claim 10 or 11 ,
When viewed from the axial direction, the outer edge of the reinforcing portion is a gear unit characterized in that a bent portion is formed of a curved line. 支持部材のベース部から突出した支軸と、
前記支軸によって回転可能に支持され、駆動源からの駆動力が伝達される歯車と、前記歯車が前記支軸の軸線回りを回転する角度範囲を規定する回転規制機構と、を有し、
前記回転規制機構は、前記歯車において前記軸線から外周側に離間する位置に設けられた当接部と、前記当接部に前記歯車の回転方向の前方から当接可能に前記支持部材に設けられた回転規制部と、を備え、
前記回転規制部は、前記ベース部から前記支軸と同一方向に突出して先端側に前記当接部が当接可能な度当たり部分を備えたストッパ部と、前記ストッパ部において前記度当たり部分より前記ベース部側の根元部分で前記軸線方向からみたときに前記ストッパ部の側壁から外側に張り出した部分からなる補強部と、を備え、
前記補強部の側面は、前記ベース部とは反対側の端部が前記ストッパ部の前記側壁に連続し、前記ベース部側の端部が前記ベース部に連続しており、
前記支持部材は、前記歯車を収容するケースであり、
前記ケースの底板部によって前記ベース部が構成されており、
前記駆動源として前記ケースに収容されたモータと、
前記モータに電力を供給するための給電ケーブルと、
前記歯車と噛み合って前記モータの駆動力を前記歯車に伝達する伝達歯車と、
前記底板部から前記支軸と同一方向に突出して前記伝達歯車を回転可能に支持する伝達歯車用支軸と、を有し、
前記底板部は、前記支軸と同一方向に突出して前記給電ケーブルを前記ケース内で案内する案内壁を備え、
前記回転規制部は、前記支軸の軸線回りで前記伝達歯車用支軸と前記案内壁との間の角度範囲に設けられており、
前記補強部は、前記案内壁に連続し、
前記案内壁は、前記回転規制部とは反対の側に位置する案内面で前記給電ケーブルを案内することを特徴とするギアユニット。 A support shaft protruding from the base of the support member,
It has a gear that is rotatably supported by the support shaft and transmits a driving force from a drive source, and a rotation control mechanism that defines an angle range in which the gear rotates around the axis of the support shaft.
The rotation regulation mechanism is provided on the support member so as to be able to contact the contact portion provided at a position separated from the axis line on the outer peripheral side of the gear and the contact portion from the front in the rotation direction of the gear. Equipped with a rotation control unit
The rotation restricting portion includes a stopper portion that protrudes from the base portion in the same direction as the support shaft and has a perforated portion on the tip end side capable of contacting the abutting portion, and the stopper portion from the perforated portion. The base portion on the base portion side is provided with a reinforcing portion formed of a portion protruding outward from the side wall of the stopper portion when viewed from the axial direction.
On the side surface of the reinforcing portion, the end portion on the side opposite to the base portion is continuous with the side wall of the stopper portion, and the end portion on the base portion side is continuous with the base portion.
The support member is a case for accommodating the gear.
The base portion is formed by the bottom plate portion of the case .
The motor housed in the case as the drive source and
A power supply cable for supplying electric power to the motor and
A transmission gear that meshes with the gear and transmits the driving force of the motor to the gear.
It has a transmission gear support shaft that projects from the bottom plate portion in the same direction as the support shaft and rotatably supports the transmission gear.
The bottom plate portion includes a guide wall that projects in the same direction as the support shaft and guides the power supply cable in the case.
The rotation restricting portion is provided in an angle range between the transmission gear support shaft and the guide wall around the axis of the support shaft.
The reinforcing portion is continuous with the guide wall.
The guide wall is a gear unit characterized in that the power supply cable is guided by a guide surface located on a side opposite to the rotation restricting portion. 請求項１３において、
前記ケースは、前記支軸および前記回転規制部も含めて樹脂による一体成型品であることを特徴とするギアユニット。 In claim 13 ,
The case is a gear unit characterized in that the case is an integrally molded product made of resin including the support shaft and the rotation restricting portion. 請求項１から１４のうちのいずれか一項において、
前記歯車は、前記支軸が挿入される筒部と、前記筒部から外周側に突出した突出部と、を備え、
前記突出部の外周面には、歯部が設けられており、
前記突出部の前記ベース部と対向する対向面には、前記軸線回りの周方向に延びる溝部が設けられており、
前記ストッパ部は、前記補強部より先端側が前記溝部に挿入され、
前記当接部は、前記溝部の内壁面のうち前記周方向の端を規定している壁面部分であることを特徴とするギアユニット。 In any one of claims 1 to 14 ,
The gear includes a tubular portion into which the support shaft is inserted, and a protruding portion protruding from the tubular portion to the outer peripheral side.
A tooth portion is provided on the outer peripheral surface of the protruding portion.
A groove extending in the circumferential direction around the axis is provided on the facing surface of the protruding portion facing the base portion.
The stopper portion is inserted into the groove portion on the tip end side of the reinforcing portion.
The gear unit is characterized in that the contact portion is a wall surface portion of the inner wall surface of the groove portion that defines an end in the circumferential direction. 請求項１５において、
前記軸線方向からみたとき、前記ストッパ部は、前記支軸周りの周方向に延在していることを特徴とするギアユニット。 15 .
A gear unit characterized in that the stopper portion extends in the circumferential direction around the support shaft when viewed from the axial direction. 請求項１６において、
前記ストッパ部は、前記側壁のうち、前記支軸の側に位置する内周部分が前記軸線を中心とする円弧面になっていることを特徴とするギアユニット。 In claim 16 ,
The stopper portion is a gear unit characterized in that the inner peripheral portion of the side wall located on the side of the support shaft is an arc surface centered on the axis. 請求項１３または１４に記載のギアユニットを備えた冷気ダンパであって、
開口部が形成されたフレームと、
前記開口部を開閉するためのバッフルと、
前記歯車と噛み合う出力歯車と、
を有し、
前記バッフルは、前記出力歯車に連結されており、
前記モータの駆動によって前記バッフルが駆動されることを特徴とする冷気ダンパ。 A cold air damper comprising the gear unit according to claim 13 or 14.
The frame with the opening and
A baffle for opening and closing the opening,
The output gear that meshes with the gear and
Have,
The baffle is connected to the output gear and
A cold air damper characterized in that the baffle is driven by the drive of the motor. 請求項１８において、
前記歯車は、軸線方向の異なる位置に、前記伝達歯車が噛合する第１歯部を有する平歯車と、前記出力歯車が噛合する第２歯部を有する欠歯歯車と、を同軸に備える複合歯車であり、
前記出力歯車は、扇形歯車であり、
前記欠歯歯車は、前記第２歯部に周方向で隣り合う位置に前記第２歯部の歯先円よりも外周側で前記歯先円に沿って湾曲する外周面を備える外周部を備え、
前記外周部は、前記軸線方向の長さが前記第２歯部の歯幅よりも短く、前記軸線方向における前記第２歯部の途中の位置に前記軸線方向の一方側を向く端面を備え、
前記扇形歯車は、前記外周面に対向する部分が切り欠かれており、前記端面における前記軸線方向の一方側で前記歯先円の内周側に進入可能な第１歯と、前記第１歯の隣に位置して前記第１歯が前記歯先円の内周側に進入したときに前記外周面に当接可能な第２歯と、を備え、
前記バッフルが前記開口部を閉じる閉位置に配置されたときに、前記第１歯が前記端面における前記軸線方向の一方側で前記歯先円の内周側に進入し前記第２歯が前記外周面に当接して前記扇形歯車が前記バッフルを開く方向に回転することが阻止されることを特徴とする冷気ダンパ。 In claim 18 ,
The gear is a composite gear coaxially provided with a spur gear having a first tooth portion with which the transmission gear meshes and a missing tooth gear having a second tooth portion with which the output gear meshes at different positions in the axial direction. And
The output gear is a fan-shaped gear.
The missing tooth gear includes an outer peripheral portion having an outer peripheral surface curved along the tooth tip circle on the outer peripheral side of the tooth tip circle of the second tooth portion at a position adjacent to the second tooth portion in the circumferential direction. ,
The outer peripheral portion has an axial length shorter than the tooth width of the second tooth portion, and has an end surface facing one side in the axial direction at a position in the middle of the second tooth portion in the axial direction.
The fan-shaped gear has a notched portion facing the outer peripheral surface, and has a first tooth that can enter the inner peripheral side of the tooth tip circle on one side in the axial direction of the end surface, and the first tooth. A second tooth, which is located next to the tooth and can come into contact with the outer peripheral surface when the first tooth enters the inner peripheral side of the tooth tip circle, is provided.
When the baffle is placed in a closed position that closes the opening, the first tooth enters the inner peripheral side of the tip circle on one side of the end face in the axial direction, and the second tooth enters the outer circumference. A cold air damper characterized in that the fan-shaped gear is prevented from rotating in a direction of opening the baffle in contact with a surface. 請求項１９において、
前記バッフルは、前記開口部を封鎖する弾性部材を備え、
前記弾性部材は、前記バッフルが前記閉位置に配置されたときに、前記フレームにおける前記開口部の開口縁に当接して弾性変形することを特徴とする冷気ダンパ。 In claim 19 .
The baffle comprises an elastic member that closes the opening.
The elastic member is a cold air damper that, when the baffle is arranged at the closed position, abuts on the opening edge of the opening in the frame and elastically deforms.
JP2016240654A 2016-08-09 2016-12-12 Gear unit and cold damper Active JP6843608B2 (en)

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