JP2006129690A - Motor - Google Patents

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JP2006129690A
JP2006129690A JP2005259527A JP2005259527A JP2006129690A JP 2006129690 A JP2006129690 A JP 2006129690A JP 2005259527 A JP2005259527 A JP 2005259527A JP 2005259527 A JP2005259527 A JP 2005259527A JP 2006129690 A JP2006129690 A JP 2006129690A
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bearing
motor
contact portion
gear housing
holding hole
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JP2005259527A
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Japanese (ja)
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Shingo Omori
伸吾 大森
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Asmo Co Ltd
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Asmo Co Ltd
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Priority to JP2005259527A priority Critical patent/JP2006129690A/en
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  • Motor Or Generator Frames (AREA)
  • Connection Of Motors, Electrical Generators, Mechanical Devices, And The Like (AREA)
  • Sliding-Contact Bearings (AREA)
  • General Details Of Gearings (AREA)
  • Mounting Of Bearings Or Others (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To provide a motor, having a deceleration part where press-fitting of a bearing is facilitated without need of high dimensional accuracy, and where pressure is prevented from being locally concentrated on the bearing and a bearing holding hole. <P>SOLUTION: The motor is provided with a motor part having a rotation axis and the deceleration part connected to the motor part. The deceleration part is provided with a gear housing 21, the bearing 22 fixed to the gear housing 21, a worm shaft 24 rotatably supported by the bearing 22 and a worm wheel 25 engaged with the worm shaft 24. A bearing-holding hole 31 to which the bearing 22 is press-fitted is formed in the gear housing 21. A plurality of narrow contact parts 31a, which are brought into contact with the bearing 22 in the circumferential direction in a narrow range and a wide contact part 31b, which is brought into contact with the bearing 22 in the circumferential direction in a range (about 180 degrees) wider than that of the narrow contact parts 31a are formed at the inner periphery of the bearing holding hole 31. The wide contact part 31b is set on the side opposite to an engaging side of the worm wheel 25, as viewed from the shaft direction of the worm shaft 24. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

本発明は、ウォーム軸及びウォームホイールを有する減速部を備えたモータに関するものである。   The present invention relates to a motor including a speed reduction unit having a worm shaft and a worm wheel.

従来、パワーウインド装置等に用いられるモータは、回転軸を有するモータ部と、該モータ部に連結された減速部とを備えている。この減速部は、ギヤハウジングとウォーム軸とウォームホイールとを有し、回転軸の回転を減速して出力する。このような減速部としては、前記ウォーム軸を回転可能に支持する軸受をギヤハウジングに形成した軸受保持孔に圧入して設けるものがある。   2. Description of the Related Art Conventionally, a motor used in a power window device or the like includes a motor unit having a rotation shaft and a speed reduction unit connected to the motor unit. The speed reduction unit includes a gear housing, a worm shaft, and a worm wheel, and decelerates and outputs the rotation of the rotation shaft. As such a speed reducing portion, there is one that is provided by press-fitting a bearing that rotatably supports the worm shaft into a bearing holding hole formed in a gear housing.

又、減速部を備えていないモータにおいてであるが、回転軸を支持する軸受を圧入する軸受保持孔としては、その内周に軸受と周方向に等角度間隔で接触（圧接）する接触部（言い換えると接触しない凹部）を形成したものがある(例えば、特許文献１参照)。このような構成では、周方向に複数の接触部が軸受に局部的に接触する構成であることから、高い寸法精度を要することなく軸受の圧入が容易となる。
実開平６−４４３６４号公報 In addition, in a motor that does not include a speed reducing portion, the bearing holding hole for press-fitting a bearing that supports the rotating shaft has a contact portion that contacts (pressure contact) with the bearing at an equal angular interval in the circumferential direction. In other words, there is one in which a concave portion that does not contact is formed (for example, see Patent Document 1). In such a configuration, since the plurality of contact portions are in contact with the bearing locally in the circumferential direction, it is easy to press-fit the bearing without requiring high dimensional accuracy.
Japanese Utility Model Publication No. 6-44364

しかしながら、上記のような軸受保持孔の形状を減速部を備えたモータに適用した場合では、軸受が圧入された状態において、軸受にウォーム軸とウォームホイールとの噛み合い反力が加わった際に、ウォーム軸の軸方向から見てウォームホイールと噛み合う側の反対側で、軸受及び軸受保持孔の接触部に圧力が局部的に集中してしまうことになる。よって、例えば、圧力が局部的に集中することによる軸受及び軸受保持孔の破損や変形が懸念される。又、特に、軸受が焼結含油軸受である場合では、軸受に加わる圧力が局部的に集中してしまうとウォーム軸との摺動面に正常に潤滑油膜が形成されない虞がある。これらのことは、駆動時に異音を発生させるなどの原因となる。   However, when the shape of the bearing holding hole as described above is applied to a motor provided with a speed reducing portion, when the meshing reaction force between the worm shaft and the worm wheel is applied to the bearing in a state where the bearing is press-fitted, As viewed from the axial direction of the worm shaft, the pressure is locally concentrated on the contact portion of the bearing and the bearing holding hole on the side opposite to the side engaged with the worm wheel. Therefore, for example, there is a concern about damage and deformation of the bearing and the bearing holding hole due to local concentration of pressure. In particular, when the bearing is a sintered oil-impregnated bearing, if the pressure applied to the bearing is concentrated locally, the lubricating oil film may not be normally formed on the sliding surface with the worm shaft. These cause abnormal noise during driving.

本発明は、上記問題点を解決するためになされたものであって、その目的は、高い寸法精度を要することなく軸受の圧入を容易としながら、軸受及び軸受保持孔に圧力が局部的に集中してしまうことを防止することができる減速部を備えたモータを提供することにある。   The present invention has been made to solve the above-mentioned problems, and its purpose is to make it easy to press-fit the bearing without requiring high dimensional accuracy, and to concentrate the pressure locally on the bearing and the bearing holding hole. An object of the present invention is to provide a motor provided with a speed reducing portion that can prevent this from happening.

請求項１に記載の発明では、回転軸を有するモータ部と該モータ部に連結された減速部とを備えたモータであって、前記減速部は、前記モータ部に組み付けられるギヤハウジングと、前記ギヤハウジングに固定される軸受と、前記ギヤハウジングに収容されるとともに前記軸受に回転可能に支持されるウォーム軸と、前記ギヤハウジングに収容されるとともに回転可能に支持され前記ウォーム軸に噛み合うウォームホイールとを有し、前記ギヤハウジングには、前記軸受が圧入される軸受保持孔が形成され、前記軸受保持孔の内周には、前記軸受と周方向に狭い範囲で接触する狭接触部、及び前記軸受と周方向に前記狭接触部よりも広い範囲で接触する広接触部が形成され、前記広接触部は、前記ウォーム軸の軸方向から見て前記ウォームホイールと噛み合う側の反対側に設定された。   The invention according to claim 1 is a motor comprising a motor part having a rotating shaft and a speed reducing part connected to the motor part, wherein the speed reducing part is a gear housing assembled to the motor part, A bearing fixed to the gear housing, a worm shaft housed in the gear housing and rotatably supported by the bearing, and a worm wheel housed in the gear housing and rotatably supported and meshing with the worm shaft The gear housing is formed with a bearing holding hole into which the bearing is press-fitted, and an inner periphery of the bearing holding hole has a narrow contact portion that contacts the bearing in a narrow range in the circumferential direction, and A wide contact portion is formed in contact with the bearing in the circumferential direction in a wider range than the narrow contact portion, and the wide contact portion is seen from the axial direction of the worm shaft. It is set to the side opposite to the side which meshes with Lumpur.

請求項２に記載の発明では、請求項１に記載のモータにおいて、前記軸受は、焼結含油軸受である。
請求項３に記載の発明では、請求項１又は２に記載のモータにおいて、前記狭接触部は、周方向に複数形成された。 According to a second aspect of the present invention, in the motor according to the first aspect, the bearing is a sintered oil-impregnated bearing.
According to a third aspect of the present invention, in the motor according to the first or second aspect, a plurality of the narrow contact portions are formed in the circumferential direction.

（作用）
請求項１に記載の発明によれば、軸受保持孔の特に狭接触部が軸受に局部的に接触する構成であることから、高い寸法精度を要することなく軸受の圧入が容易となる。一方、軸受が圧入された状態においては、軸受にウォーム軸とウォームホイールとの噛み合い反力が加わっても広接触部にて軸受及び軸受保持孔に加わる圧力が良好に分散される(圧力が局部的に集中しない)。 (Function)
According to the first aspect of the present invention, since the narrow contact portion of the bearing holding hole is in contact with the bearing locally, it is easy to press-fit the bearing without requiring high dimensional accuracy. On the other hand, in a state where the bearing is press-fitted, the pressure applied to the bearing and the bearing holding hole at the wide contact portion is well dispersed even if the meshing reaction force between the worm shaft and the worm wheel is applied to the bearing (the pressure is locally Do n’t concentrate).

請求項２に記載の発明によれば、焼結含油軸受は、軸受保持孔に加わる圧力が局部的に集中してしまうとウォーム軸との摺動面に正常に潤滑油膜を形成できない虞がある。つまり、焼結含油軸受は、該軸受とウォーム軸との摺動による軸受内の圧力分布により摺動面に潤滑油膜を形成するが、従来の如く軸受保持孔に周方向に沿って軸受と圧接する接触部と接触しない凹部（隙間）とを（均等に）設けた場合、軸受内の圧力分布が所望の圧力分布でなくなり、摺動面に十分な潤滑油膜を形成できない虞がある。これに対し、広接触部を形成することにより、軸受内の圧力分布を所望の圧力分布に維持することができるため、正常に潤滑油膜を形成でき、ウォーム軸を良好に支持することができる。   According to the second aspect of the present invention, in the sintered oil-impregnated bearing, if the pressure applied to the bearing holding hole is concentrated locally, there is a possibility that the lubricating oil film cannot be normally formed on the sliding surface with the worm shaft. . In other words, a sintered oil-impregnated bearing forms a lubricating oil film on the sliding surface due to the pressure distribution in the bearing due to the sliding between the bearing and the worm shaft. In the case where the contact portions that do contact and the recesses (gap) that do not contact (equally) are provided, the pressure distribution in the bearing is not a desired pressure distribution, and a sufficient lubricating oil film may not be formed on the sliding surface. On the other hand, since the pressure distribution in the bearing can be maintained at a desired pressure distribution by forming the wide contact portion, the lubricating oil film can be formed normally and the worm shaft can be favorably supported.

請求項３に記載の発明によれば、狭接触部は周方向に複数形成されるため、広接触部を除いた部分でも軸受を周方向に複数で（バランス良く）支持できる。   According to the third aspect of the present invention, since a plurality of narrow contact portions are formed in the circumferential direction, a plurality of bearings can be supported in a circumferential direction (with good balance) even in a portion excluding the wide contact portion.

本発明によれば、高い寸法精度を要することなく軸受の圧入を容易としながら、軸受及び軸受保持孔に圧力が局部的に集中してしまうことを防止することができる減速部を備えたモータを提供することができる。   According to the present invention, there is provided a motor including a speed reduction portion that can prevent pressure from being concentrated locally on a bearing and a bearing holding hole while facilitating press-fitting of the bearing without requiring high dimensional accuracy. Can be provided.

以下、本発明を車両におけるパワーウインド装置のモータ１に具体化した一実施の形態を図１〜図４に従って説明する。図１に示すように、モータ１は、モータ部２と減速部３とを備えている。   Hereinafter, an embodiment in which the present invention is embodied in a motor 1 of a power window device in a vehicle will be described with reference to FIGS. As shown in FIG. 1, the motor 1 includes a motor unit 2 and a speed reduction unit 3.

モータ部２は、扁平の略有底筒状に形成されたヨークハウジング（以下、単にヨークという）４と、該ヨーク４内面に固定された一対のマグネット５と、該ヨーク４内で回転可能に支持されるアーマチャ（電機子）６と、ブラシホルダ７とを備えている。   The motor unit 2 includes a yoke housing (hereinafter simply referred to as a yoke) 4 formed in a flat, substantially bottomed cylindrical shape, a pair of magnets 5 fixed to the inner surface of the yoke 4, and is rotatable within the yoke 4. A supported armature (armature) 6 and a brush holder 7 are provided.

ブラシホルダ７は、樹脂材料よりなり、前記ヨーク４の開口部に配設され、軸受８及びブラシ９を保持する。そして、アーマチャ６の回転軸１０は、前記軸受８とヨーク４の底部（図１中、上部）に固定された軸受１１とにより回転可能に支持され、アーマチャ６の整流子１２にはブラシ９が押圧接触される。   The brush holder 7 is made of a resin material, is disposed in the opening of the yoke 4, and holds the bearing 8 and the brush 9. The rotating shaft 10 of the armature 6 is rotatably supported by the bearing 8 and a bearing 11 fixed to the bottom portion (upper portion in FIG. 1) of the yoke 4, and a brush 9 is attached to the commutator 12 of the armature 6. Press contact.

前記減速部３は、ギヤハウジング２１と、一対の軸受２２，２３と、ウォーム軸２４と、ウォームホイール２５と、クラッチ２６（図２参照）とを備える。
ギヤハウジング２１は、樹脂材料よりなる。ギヤハウジング２１は、固定部２１ａと、ウォーム収容部２１ｂと、ホイール収容部２１ｃとを備える。 The speed reduction unit 3 includes a gear housing 21, a pair of bearings 22, 23, a worm shaft 24, a worm wheel 25, and a clutch 26 (see FIG. 2).
The gear housing 21 is made of a resin material. The gear housing 21 includes a fixed portion 21a, a worm accommodating portion 21b, and a wheel accommodating portion 21c.

固定部２１ａは、ヨーク４の開口部に形成されたフランジ部４ａと対応した形状に形成されて（図３参照）該フランジ部４ａにネジにて固定され、該フランジ部４ａとともに前記ブラシホルダ７を挟持する。尚、図３は、回転軸１０の軸線に沿った方向から（モータ部２側から）見たギヤハウジング２１であって、ウォーム軸２４及びクラッチ２６が組み付けられていないものを示している。   The fixing portion 21a is formed in a shape corresponding to the flange portion 4a formed in the opening portion of the yoke 4 (see FIG. 3) and fixed to the flange portion 4a with a screw, and the brush holder 7 together with the flange portion 4a. Pinch. FIG. 3 shows the gear housing 21 as viewed from the direction along the axis of the rotary shaft 10 (from the motor unit 2 side), in which the worm shaft 24 and the clutch 26 are not assembled.

ウォーム収容部２１ｂは、前記回転軸１０の延長線上で筒状に延びて形成され、その内部に軸受２２，２３を介してウォーム軸２４を回転可能に支持する。又、ウォーム収容部２１ｂのモータ部２側端部には、図２に示すように、ウォーム軸２４と回転軸１０とを駆動連結するクラッチ２６が設けられている。このクラッチ２６は、回転軸１０からの駆動力をウォーム軸２４に伝達し、逆にウォーム軸２４からの駆動力が回転軸１０に伝達されないようウォーム軸２４の回転をロックするように作動する。つまり、このクラッチ２６は、負荷側から加わる力によるモータ１の回転を防止するために設けられている。   The worm accommodating portion 21b is formed to extend in a cylindrical shape on the extension line of the rotary shaft 10, and supports the worm shaft 24 rotatably through bearings 22 and 23 therein. Further, as shown in FIG. 2, a clutch 26 for drivingly connecting the worm shaft 24 and the rotary shaft 10 is provided at the end of the worm housing portion 21b on the motor portion 2 side. The clutch 26 operates to lock the rotation of the worm shaft 24 so that the driving force from the rotating shaft 10 is transmitted to the worm shaft 24, and conversely, the driving force from the worm shaft 24 is not transmitted to the rotating shaft 10. That is, the clutch 26 is provided to prevent the motor 1 from rotating due to the force applied from the load side.

ホイール収容部２１ｃは、ウォーム収容部２１ｂと直交する方向で扁平の円盤形状に形成され、その内部にウォームホイール２５を回転可能に支持する。尚、ウォーム収容部２１ｂとホイール収容部２１ｃとはその内部が一部で連通し、該連通部分でウォーム軸２４とウォームホイール２５とが噛み合わされる。そして、このウォームホイール２５に連結される図示しない出力軸は、図示しないレギュレータ等を介してウインドガラスに連結される。   The wheel accommodating part 21c is formed in a flat disk shape in a direction orthogonal to the worm accommodating part 21b, and supports the worm wheel 25 rotatably therein. The worm accommodating portion 21b and the wheel accommodating portion 21c are partially communicated with each other, and the worm shaft 24 and the worm wheel 25 are engaged with each other at the communicating portion. An output shaft (not shown) connected to the worm wheel 25 is connected to the window glass via a regulator (not shown).

ここで、前記軸受２２，２３は、ギヤハウジング２１（ウォーム収容部２１ｂ）に形成された軸受保持孔３１，３２に圧入されて固定されている。詳しくは、本実施の形態の軸受２２，２３は、焼結含油軸受であって、その内外周が共に真円の円筒形状に形成されている。そして、ギヤハウジング２１においてウォーム収容部２１ｂのモータ部２側には、図２〜図４に示すように、軸受保持孔３１が形成されている。この軸受保持孔３１の内周には、図４に示すように、軸受２２（その外周）と周方向に狭い範囲で接触する狭接触部３１ａ及び軸受２２と周方向に狭接触部３１ａよりも広い範囲で接触する広接触部３１ｂが形成されている。この広接触部３１ｂは、ウォーム軸２４の軸方向から見てウォーム軸２４がウォームホイール２５と噛み合う側の反対側（図４中、下側）に設定されている。又、本実施の形態では、広接触部３１ｂは、約１８０度の範囲で接触するように（即ち半円形状に）形成されている。又、狭接触部３１ａは、複数（本実施の形態では３つ）形成されている。又、本実施の形態の狭接触部３１ａは、ウォーム軸２４の軸方向から見てウォームホイール２５と噛み合う側を中心としてそれぞれの周方向に４５度間隔で（噛み合う方向の中心線Ｌに対して対称に）形成されている。又、本実施の形態の狭接触部３１ａは、前記軸方向から見て軸受２２の接線（詳しくは軸受２２の外周より僅かに小さい円の接線）方向に沿った平面３１ｃが形成されることで、形成されている。又、前記平面３１ｃ同士は軸受２２の外径より大きな径の内周面（円弧面）３１ｄにて連結されている。   Here, the bearings 22 and 23 are press-fitted and fixed in bearing holding holes 31 and 32 formed in the gear housing 21 (worm housing portion 21b). Specifically, the bearings 22 and 23 of the present embodiment are sintered oil-impregnated bearings, and both the inner and outer circumferences are formed in a perfect circular cylindrical shape. As shown in FIGS. 2 to 4, a bearing holding hole 31 is formed in the gear housing 21 on the motor portion 2 side of the worm housing portion 21 b. As shown in FIG. 4, the bearing holding hole 31 has a narrow contact portion 31a that is in contact with the bearing 22 (outer periphery thereof) in a narrow range in the circumferential direction and a narrow contact portion 31a in the circumferential direction than the narrow contact portion 31a in the circumferential direction. The wide contact part 31b which contacts in a wide range is formed. The wide contact portion 31b is set on the opposite side (lower side in FIG. 4) to the side where the worm shaft 24 meshes with the worm wheel 25 when viewed from the axial direction of the worm shaft 24. In the present embodiment, the wide contact portion 31b is formed so as to be in contact within a range of about 180 degrees (that is, in a semicircular shape). A plurality (three in this embodiment) of narrow contact portions 31a are formed. In addition, the narrow contact portion 31a of the present embodiment has an interval of 45 degrees in each circumferential direction with respect to the side that meshes with the worm wheel 25 when viewed from the axial direction of the worm shaft 24 (with respect to the center line L in the meshing direction). Symmetrically). Further, the narrow contact portion 31a of the present embodiment is formed by forming a flat surface 31c along the tangential line of the bearing 22 (specifically, a tangent of a circle slightly smaller than the outer periphery of the bearing 22) as viewed from the axial direction. Is formed. The planes 31 c are connected to each other by an inner peripheral surface (arc surface) 31 d having a diameter larger than the outer diameter of the bearing 22.

尚、図４では、ウォーム軸２４を模式的に（径を小さく）示している。又、前記軸受２３及び前記軸受保持孔３２は、ギヤハウジング２１においてウォーム収容部２１ｂの反モータ部２側に配設されるが、前記軸受２２及び前記軸受保持孔３１と内外径が異なるのみであり形状は同様（軸受保持孔３２も狭接触部及び広接触部を有する）であるため、図示は省略する。   In FIG. 4, the worm shaft 24 is schematically shown (with a small diameter). The bearing 23 and the bearing holding hole 32 are disposed on the side of the gear housing 21 opposite to the motor portion 2 of the worm accommodating portion 21b, but differ only in the inner and outer diameters from the bearing 22 and the bearing holding hole 31. Since the dovetail shape is the same (the bearing holding hole 32 also has a narrow contact portion and a wide contact portion), the illustration is omitted.

次に、上記実施の形態の特徴的な作用効果を以下に記載する。
（１）軸受保持孔３１，３２の狭接触部３１ａが軸受２２，２３に局部的に接触する構成であることから、軸受保持孔が真円のものに比べて、高い寸法精度を要することなく軸受２２，２３の（良好な）圧入が容易となる。 Next, characteristic effects of the above embodiment will be described below.
(1) Since the narrow contact portions 31a of the bearing holding holes 31 and 32 are locally in contact with the bearings 22 and 23, the bearing holding holes do not require high dimensional accuracy compared to a perfect circle. The (good) press-fitting of the bearings 22 and 23 is facilitated.

一方、軸受２２，２３が圧入（固定）された状態においては、軸受２２，２３に駆動時におけるウォーム軸２４とウォームホイール２５との噛み合い反力が加わっても広接触部３１ｂにて軸受２２，２３及び軸受保持孔３１，３２に加わる圧力が良好に分散される(圧力が局部的に集中しない)。その結果、例えば、圧力が局部的に集中することによる軸受２２及び軸受保持孔３１の破損や変形が防止され、ひいては駆動時の異音等を防止することができる。   On the other hand, in the state in which the bearings 22 and 23 are press-fitted (fixed), even if the meshing reaction force between the worm shaft 24 and the worm wheel 25 during driving is applied to the bearings 22 and 23, the bearings 22 and 23 are 23 and the bearing holding holes 31 and 32 are well dispersed (the pressure is not concentrated locally). As a result, for example, damage and deformation of the bearing 22 and the bearing holding hole 31 due to local concentration of pressure can be prevented, and thus abnormal noise during driving can be prevented.

（２）軸受２２，２３は焼結含油軸受であって、焼結含油軸受は、軸受保持孔３１，３２に加わる圧力が局部的に集中してしまうとウォーム軸２４との摺動面に正常に潤滑油膜を形成できない虞がある。つまり、焼結含油軸受である軸受２２，２３は、該軸受２２，２３とウォーム軸２４との摺動による軸受内の圧力分布により摺動面に潤滑油膜を形成するが、従来の如く軸受保持孔に周方向に沿って軸受と圧接する接触部と接触しない凹部（隙間）とを（均等に）設けた場合、軸受内の圧力分布が所望の圧力分布でなくなり、摺動面に十分な潤滑油膜を形成できない虞がある。これに対し、広接触部３１ｂを形成することにより、軸受２２，２３内の圧力分布を所望の圧力分布に維持することができるため、正常に潤滑油膜を形成でき、ウォーム軸２４を良好に支持することができる。その結果、例えば、駆動時の異音を防止することができる。また、広接触部３１ｂにより焼結含油軸受である軸受２２，２３の外周面から潤滑油が漏れ出すことが防止されることから、例えば、軸受２２，２３の外周面にサイジング加工を施す必要がなくなる。   (2) The bearings 22 and 23 are sintered oil-impregnated bearings. When the pressure applied to the bearing holding holes 31 and 32 is locally concentrated, the sintered oil-impregnated bearing is normal on the sliding surface with the worm shaft 24. However, there is a possibility that a lubricating oil film cannot be formed. In other words, the bearings 22 and 23 that are sintered oil-impregnated bearings form a lubricating oil film on the sliding surface due to the pressure distribution in the bearing due to the sliding between the bearings 22 and 23 and the worm shaft 24. If the hole is provided with a contact part that presses against the bearing along the circumferential direction and a concave part (gap) that does not contact the bearing (evenly), the pressure distribution in the bearing is not the desired pressure distribution, and the sliding surface is sufficiently lubricated. There is a possibility that an oil film cannot be formed. On the other hand, by forming the wide contact portion 31b, the pressure distribution in the bearings 22 and 23 can be maintained at a desired pressure distribution, so that a lubricating oil film can be formed normally and the worm shaft 24 is well supported. can do. As a result, for example, abnormal noise during driving can be prevented. Further, since the wide contact portion 31b prevents the lubricating oil from leaking from the outer peripheral surfaces of the bearings 22 and 23 that are sintered oil-impregnated bearings, for example, it is necessary to perform sizing on the outer peripheral surfaces of the bearings 22 and 23. Disappear.

（３）狭接触部３１ａは周方向に複数（３つ）形成されるため、広接触部３１ｂを除いた部分でも軸受２２，２３を周方向に複数で（バランス良く）支持できる。
上記実施の形態は、以下のように変更してもよい。 (3) Since a plurality (three) of narrow contact portions 31a are formed in the circumferential direction, a plurality of bearings 22 and 23 can be supported in a circumferential direction (with good balance) even in a portion excluding the wide contact portion 31b.
The above embodiment may be modified as follows.

・上記実施の形態の軸受保持孔３１，３２は、その内周に、軸受と周方向に狭い範囲で接触する狭接触部、及び軸受と周方向に狭接触部よりも広い範囲で接触する広接触部が形成され、広接触部がウォーム軸の軸方向から見てウォームホイールと噛み合う側の反対側に設定されていれば、他の形状に変更してもよい。   The bearing holding holes 31 and 32 of the above-described embodiment have a narrow contact portion that is in contact with the bearing in a narrow range in the circumferential direction and a wide contact portion that is in contact with the bearing in a wider range than the narrow contact portion in the circumferential direction. As long as the contact portion is formed and the wide contact portion is set on the side opposite to the side that meshes with the worm wheel when viewed from the axial direction of the worm shaft, the shape may be changed to another shape.

例えば、図５に示す軸受保持孔４１に変更してもよい。即ち、上記実施の形態では、狭接触部３１ａを形成する前記平面３１ｃ同士が軸受２２の外径より大きな径の内周面（円弧面）３１ｄにて連結されるとしたが、図５に示すように、平面４１ａ同士が周方向に繋がる形状に（即ち、多角形（正八角形）の一部となるように）変更してもよい。   For example, the bearing holding hole 41 shown in FIG. That is, in the above embodiment, the flat surfaces 31c forming the narrow contact portion 31a are connected by the inner peripheral surface (arc surface) 31d having a diameter larger than the outer diameter of the bearing 22, as shown in FIG. In this way, the shape may be changed so that the flat surfaces 41a are connected to each other in the circumferential direction (that is, a part of a polygon (regular octagon)).

又、例えば、図６に示す軸受保持孔５１に変更してもよい。即ち、この例の狭接触部５１ａは、軸受２２の外周より僅かに小さい円（円弧）の内周に軸方向から見て円弧状の凹部５１ｂが周方向に連続的に形成されることで、（その最内側部分により）形成されている。   Further, for example, the bearing holding hole 51 shown in FIG. 6 may be changed. That is, the narrow contact portion 51a of this example is formed by continuously forming an arcuate recess 51b in the circumferential direction when viewed from the axial direction on the inner circumference of a circle (arc) slightly smaller than the outer circumference of the bearing 22. Formed by its innermost part.

又、例えば、前記狭接触部３１ａ，５１ａの数は、３つに限定されず、１つとしてもよいし、３つ以外の複数（例えば、２つや４つ等）に変更してもよい。
又、例えば、上記実施の形態では、広接触部３１ｂは、約１８０度の範囲で接触するように（即ち半円形状に）形成されるとしたが、狭接触部３１ａ，５１ａよりも広い範囲で接触するように設定されていれば、接触する範囲を（例えば、９０度や１２０度等に）変更してもよい。尚、勿論、この場合でも広接触部を、ウォーム軸の軸方向から見てウォーム軸がウォームホイールと噛み合う側の反対側に設定する必要がある。 For example, the number of the narrow contact portions 31a and 51a is not limited to three, and may be one or may be changed to a plurality other than three (for example, two or four).
Further, for example, in the above embodiment, the wide contact portion 31b is formed so as to contact within a range of about 180 degrees (that is, in a semicircular shape), but a wider range than the narrow contact portions 31a and 51a. If it is set so as to contact, the contact range may be changed (for example, 90 degrees, 120 degrees, etc.). Of course, even in this case, it is necessary to set the wide contact portion on the side opposite to the side where the worm shaft meshes with the worm wheel when viewed from the axial direction of the worm shaft.

・上記実施の形態では、軸受２２，２３は、ウォーム軸２４の両端側を支持すべく一対設けられ、それぞれの軸受２２，２３を保持する軸受保持孔３１，３２には、共に狭接触部３１ａ及び広接触部３１ｂが形成されるとしたが、いずれか一方のみの軸受保持孔に狭接触部及び広接触部が形成されるように変更してもよい。   In the above embodiment, the bearings 22 and 23 are provided as a pair to support both ends of the worm shaft 24, and the bearing holding holes 31 and 32 holding the bearings 22 and 23 are both narrow contact portions 31a. The wide contact portion 31b is formed, but the narrow contact portion and the wide contact portion may be formed in only one of the bearing holding holes.

・上記実施の形態では、軸受２２，２３を焼結含油軸受としたが、他の軸受に変更してもよく、例えば、ボールベアリングに変更してもよい。このようにしても、軸受及び軸受保持孔に加わる圧力が良好に分散される(圧力が局部的に集中しない)。その結果、例えば、圧力が局部的に集中することによる軸受及び軸受保持孔の破損や変形が防止され、ひいては駆動時の異音等を防止することができる。   In the above embodiment, the bearings 22 and 23 are sintered oil-impregnated bearings, but may be changed to other bearings, for example, may be changed to ball bearings. Even in this case, the pressure applied to the bearing and the bearing holding hole is well dispersed (the pressure is not concentrated locally). As a result, for example, damage and deformation of the bearing and the bearing holding hole due to local concentration of pressure can be prevented, and abnormal noise during driving can be prevented.

・上記実施の形態では、回転軸１０とウォーム軸２４とがクラッチ２６を介して連結されるとしたが、クラッチ２６を省略した構成（例えば、単なるジョイントにより連結された構成）に変更してもよい。   In the above embodiment, the rotary shaft 10 and the worm shaft 24 are connected via the clutch 26. However, the clutch 26 may be omitted (for example, a configuration connected by a simple joint). Good.

・上記実施の形態では、軸受２２，２３の外周が真円で、軸受保持孔３１，３２の内周に狭接触部３１ａ及び広接触部３１ｂを形成したが、逆に、軸受保持孔の内周を例えば真円とし、軸受の外周に軸受保持孔と周方向に狭い範囲で接触する軸受狭接触部及び軸受保持孔と周方向に軸受狭接触部よりも広い範囲で接触する軸受広接触部を形成してもよい。即ち、軸受の外周に凹部等を形成することで複数の軸受狭接触部を形成してもよい。尚、この場合、軸受保持孔の内周をも真円にする必要はなく、例えば、軸受保持孔に実施の形態と同様の狭接触部３１ａ及び広接触部３１ｂを形成してもよい。   In the above embodiment, the outer circumference of the bearings 22 and 23 is a perfect circle, and the narrow contact portion 31a and the wide contact portion 31b are formed on the inner circumference of the bearing holding holes 31 and 32. For example, the circumference is a perfect circle, and the bearing narrow contact portion that contacts the bearing outer periphery with the bearing holding hole in a narrow range in the circumferential direction and the bearing wide contact portion that contacts the bearing holding hole with the circumferential direction in a wider range than the bearing narrow contact portion May be formed. That is, you may form a some bearing narrow contact part by forming a recessed part etc. in the outer periphery of a bearing. In this case, the inner circumference of the bearing holding hole does not need to be a perfect circle. For example, the narrow contact portion 31a and the wide contact portion 31b similar to the embodiment may be formed in the bearing holding hole.

・上記実施の形態では、パワーウインド装置のモータ１に具体化したが、他の装置（例えば、サンルーフ装置やワイパ装置等）のモータに具体化してもよい。又、車両以外に搭載されるモータに具体化してもよい。   In the above embodiment, the motor 1 is embodied in the power window device, but may be embodied in a motor of another device (for example, a sunroof device or a wiper device). Moreover, you may actualize in the motor mounted in vehicles other than a vehicle.

上記各実施の形態から把握できる技術的思想について、以下にその効果とともに記載する。
（イ）請求項１乃至３のいずれか１項に記載のモータにおいて、前記軸受は、前記ウォーム軸の両端側を支持すべく一対設けられ、前記狭接触部及び前記広接触部が形成された前記軸受保持孔は、それぞれの前記軸受を保持すべく一対形成されたことを特徴とするモータ。このようにすると、一対の軸受及び軸受保持孔でそれぞれ請求項１乃至３のいずれか１項に記載の発明の効果を得ることができる。 The technical idea that can be grasped from the above embodiments will be described below together with the effects thereof.
(A) In the motor according to any one of claims 1 to 3, a pair of the bearings are provided to support both end sides of the worm shaft, and the narrow contact portion and the wide contact portion are formed. A motor, wherein the bearing holding holes are formed in pairs to hold the respective bearings. If it does in this way, the effect of the invention of any one of Claims 1 thru | or 3 can be acquired with a pair of bearing and a bearing holding hole, respectively.

（ロ）回転軸を有するモータ部と該モータ部に連結された減速部とを備えたモータであって、前記減速部は、前記モータ部に組み付けられるギヤハウジングと、前記ギヤハウジングに固定される軸受と、前記ギヤハウジングに収容されるとともに前記軸受に回転可能に支持されるウォーム軸と、前記ギヤハウジングに収容されるとともに回転可能に支持され前記ウォーム軸に噛み合うウォームホイールとを有し、前記ギヤハウジングには、前記軸受が圧入される軸受保持孔が形成され、前記軸受の外周には、前記軸受保持孔と周方向に狭い範囲で接触する軸受狭接触部、及び前記軸受保持孔と周方向に前記軸受狭接触部よりも広い範囲で接触する軸受広接触部が形成され、前記軸受広接触部は、前記ウォーム軸の軸方向から見て前記ウォームホイールと噛み合う側の反対側に設定されたことを特徴とするモータ。このようにすると、軸受の特に軸受狭接触部が軸受保持孔に局部的に接触する構成であることから、高い寸法精度を要することなく軸受の圧入が容易となる。一方、軸受が圧入された状態においては、軸受にウォーム軸とウォームホイールとの噛み合い反力が加わっても軸受広接触部にて軸受及び軸受保持孔に加わる圧力が良好に分散される(圧力が局部的に集中しない)。   (B) A motor including a motor unit having a rotation shaft and a reduction unit coupled to the motor unit, the reduction unit being fixed to the gear housing and a gear housing assembled to the motor unit A bearing, a worm shaft housed in the gear housing and rotatably supported by the bearing, and a worm wheel housed in the gear housing and rotatably supported and meshing with the worm shaft, A bearing holding hole into which the bearing is press-fitted is formed in the gear housing, and a bearing narrow contact portion that is in contact with the bearing holding hole in a narrow range in the circumferential direction is formed on the outer periphery of the bearing, and the bearing holding hole and the periphery. A wide bearing contact portion that contacts in a direction wider than the narrow bearing contact portion is formed in the direction, and the wide bearing contact portion is the worm shaft when viewed from the axial direction of the worm shaft. Motor, characterized in that it is set to the side opposite to the side which meshes with Eel. In this way, since the bearing, particularly the narrow contact portion of the bearing is in contact with the bearing holding hole locally, it is easy to press-fit the bearing without requiring high dimensional accuracy. On the other hand, in a state where the bearing is press-fitted, the pressure applied to the bearing and the bearing holding hole is well dispersed at the wide bearing contact portion even when the meshing reaction force between the worm shaft and the worm wheel is applied to the bearing (the pressure is reduced). Do not concentrate locally).

本実施の形態におけるモータの断面図。Sectional drawing of the motor in this Embodiment. 本実施の形態におけるモータの一部断面分。The partial cross section of the motor in this Embodiment. 本実施の形態のギヤハウジングを説明するための説明図。Explanatory drawing for demonstrating the gear housing of this Embodiment. 本実施の形態における軸受保持孔を説明するための断面図。Sectional drawing for demonstrating the bearing holding hole in this Embodiment. 別例における軸受保持孔を説明するための断面図。Sectional drawing for demonstrating the bearing holding hole in another example. 別例における軸受保持孔を説明するための断面図。Sectional drawing for demonstrating the bearing holding hole in another example.

符号の説明Explanation of symbols

２…モータ部、３…減速部、１０…回転軸、２１…ギヤハウジング、２２，２３…軸受、２４…ウォーム軸、２５…ウォームホイール、３１，３２，４１，５１…軸受保持孔、３１ａ，５１ａ…狭接触部、３１ｂ…広接触部。   DESCRIPTION OF SYMBOLS 2 ... Motor part, 3 ... Reduction part, 10 ... Rotating shaft, 21 ... Gear housing, 22, 23 ... Bearing, 24 ... Worm shaft, 25 ... Worm wheel, 31, 32, 41, 51 ... Bearing holding hole, 31a, 51a ... narrow contact portion, 31b ... wide contact portion.

Claims (3)

回転軸を有するモータ部と該モータ部に連結された減速部とを備えたモータであって、
前記減速部は、前記モータ部に組み付けられるギヤハウジングと、前記ギヤハウジングに固定される軸受と、前記ギヤハウジングに収容されるとともに前記軸受に回転可能に支持されるウォーム軸と、前記ギヤハウジングに収容されるとともに回転可能に支持され前記ウォーム軸に噛み合うウォームホイールとを有し、
前記ギヤハウジングには、前記軸受が圧入される軸受保持孔が形成され、
前記軸受保持孔の内周には、
前記軸受と周方向に狭い範囲で接触する狭接触部、及び前記軸受と周方向に前記狭接触部よりも広い範囲で接触する広接触部が形成され、
前記広接触部は、前記ウォーム軸の軸方向から見て前記ウォームホイールと噛み合う側の反対側に設定されたことを特徴とするモータ。 A motor comprising a motor part having a rotating shaft and a speed reducing part connected to the motor part,
The speed reduction portion includes a gear housing assembled to the motor portion, a bearing fixed to the gear housing, a worm shaft housed in the gear housing and rotatably supported by the bearing, and the gear housing. A worm wheel that is housed and rotatably supported and meshes with the worm shaft;
The gear housing is formed with a bearing holding hole into which the bearing is press-fitted,
In the inner periphery of the bearing holding hole,
A narrow contact portion that contacts the bearing in a narrow range in the circumferential direction, and a wide contact portion that contacts the bearing in the circumferential direction in a wider range than the narrow contact portion are formed,
The motor according to claim 1, wherein the wide contact portion is set on a side opposite to a side meshing with the worm wheel when viewed from an axial direction of the worm shaft. 請求項１に記載のモータにおいて、
前記軸受は、焼結含油軸受であることを特徴とするモータ。 The motor according to claim 1,
The motor is characterized in that the bearing is a sintered oil-impregnated bearing. 請求項１又は２に記載のモータにおいて、
前記狭接触部は、周方向に複数形成されたことを特徴とするモータ。 The motor according to claim 1 or 2,
A motor characterized in that a plurality of the narrow contact portions are formed in the circumferential direction.
JP2005259527A 2004-09-28 2005-09-07 Motor Pending JP2006129690A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010196733A (en) * 2009-02-23 2010-09-09 Asmo Co Ltd Bearing device and motor

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH10281235A (en) * 1997-04-03 1998-10-23 Kayaba Ind Co Ltd Power transmission device
JPH10285870A (en) * 1997-04-02 1998-10-23 Mabuchi Motor Co Ltd Compact motor with reduction gear
JP2003278844A (en) * 2002-03-22 2003-10-02 Koyo Seiko Co Ltd Reduction gear mechanism and electric power steering device using the same

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH10285870A (en) * 1997-04-02 1998-10-23 Mabuchi Motor Co Ltd Compact motor with reduction gear
JPH10281235A (en) * 1997-04-03 1998-10-23 Kayaba Ind Co Ltd Power transmission device
JP2003278844A (en) * 2002-03-22 2003-10-02 Koyo Seiko Co Ltd Reduction gear mechanism and electric power steering device using the same

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010196733A (en) * 2009-02-23 2010-09-09 Asmo Co Ltd Bearing device and motor

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