JP2020190316A - Input shaft and speed reducer - Google Patents

Input shaft and speed reducer Download PDF

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JP2020190316A
JP2020190316A JP2019096986A JP2019096986A JP2020190316A JP 2020190316 A JP2020190316 A JP 2020190316A JP 2019096986 A JP2019096986 A JP 2019096986A JP 2019096986 A JP2019096986 A JP 2019096986A JP 2020190316 A JP2020190316 A JP 2020190316A
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input shaft
mounting portion
outer diameter
support portion
bearing
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JP7373919B2 (en
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州一 鎌形
Shuichi Kamagata
州一 鎌形
有一郎 松田
Yuichiro Matsuda
有一郎 松田
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Nabtesco Corp
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Nabtesco Corp
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H57/00—General details of gearing
    • F16H57/02—Gearboxes; Mounting gearing therein
    • F16H57/021—Shaft support structures, e.g. partition walls, bearing eyes, casing walls or covers with bearings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
    • F16C33/72—Sealings
    • F16C33/723—Shaft end sealing means, e.g. cup-shaped caps or covers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16J—PISTONS; CYLINDERS; SEALINGS
    • F16J15/00—Sealings
    • F16J15/16—Sealings between relatively-moving surfaces

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Retarders (AREA)
  • General Details Of Gearings (AREA)

Abstract

To provide a hollow input shaft whose inner diameter has been extended, and a speed reducer comprising the input shaft.SOLUTION: An input shaft 2 is an input shaft supported by a first bearing 6A and a second bearing 6B, driven via a pulley P, and having a cavity C inside. The input shaft comprises a first support part 12 supported by the first bearing 6A, a second support part 14 supported by the second bearing 6B, and a mounting part 18 that is arranged on the outer peripheral surface opposite to the second support part 14 with respect to the first support part 12 and to which the pulley P is mounted.SELECTED DRAWING: Figure 1

Description

本発明は、入力軸および減速機に関するものである。 The present invention relates to an input shaft and a speed reducer.

減速機は、中央部に配置された円筒状の入力軸を備え、全体として筒状に形成されたものがある（例えば、特許文献１参照）。入力軸には、減速機に回転力を入力するためのプーリーや歯車等といった駆動部品が取り付けられる場合がある。駆動部品を入力軸に取り付ける方法として、入力軸の端面に雌ねじを形成し、入力軸の端面の雌ねじにねじ込まれたボルト等の締結材により駆動部品を入力軸に締結する方法が取られる。 Some speed reducers have a cylindrical input shaft arranged at the center and are formed in a cylindrical shape as a whole (see, for example, Patent Document 1). Drive parts such as pulleys and gears for inputting rotational force to the speed reducer may be attached to the input shaft. As a method of attaching the drive component to the input shaft, a method is adopted in which a female screw is formed on the end face of the input shaft and the drive component is fastened to the input shaft with a fastening material such as a bolt screwed into the female screw on the end face of the input shaft.

特開２０１０−１０７０５３号公報Japanese Unexamined Patent Publication No. 2010-107053

ところで、全体として筒状に形成された減速機においては、入力軸の内側にケーブル等を通すため、入力軸の内径を大きくしたいという要望がある。しかしながら、上述したように入力軸の端面の雌ねじを形成して入力軸に駆動部品を締結する場合、入力軸の肉厚を雌ねじの内径以上に設定する必要がある。このため、入力軸の内径の拡大には限界がある。 By the way, in a speed reducer formed in a tubular shape as a whole, there is a demand for increasing the inner diameter of the input shaft in order to pass a cable or the like inside the input shaft. However, when the female screw on the end face of the input shaft is formed and the drive component is fastened to the input shaft as described above, it is necessary to set the wall thickness of the input shaft to be equal to or larger than the inner diameter of the female screw. Therefore, there is a limit to the expansion of the inner diameter of the input shaft.

そこで本発明は、内径の拡大が図られた中空の入力軸、およびその入力軸を備えた減速機を提供するものである。 Therefore, the present invention provides a hollow input shaft having an enlarged inner diameter, and a speed reducer provided with the input shaft.

本発明の一態様に係る入力軸は、第１軸受および第２軸受に支持され駆動部品を介して駆動され内部に空洞を有する入力軸であって、前記第１軸受に支持される第１支持部と、前記第２軸受に支持される第２支持部と、前記第１支持部に対して前記第２支持部とは反対側の外周面に配置され前記駆動部品が取り付けられる取付部と、を有する。 The input shaft according to one aspect of the present invention is an input shaft supported by a first bearing and a second bearing, driven via a driving component, and having a cavity inside, and is a first support supported by the first bearing. A portion, a second support portion supported by the second bearing, and a mounting portion arranged on an outer peripheral surface of the first support portion opposite to the second support portion and to which the drive component is mounted. Have.

本発明の一態様に係る入力軸によれば、取付部が外周面に配置されるので、端部に駆動部品を取り付ける場合、従来技術のように入力軸の端面に雌ねじを形成する構成と比較して、入力軸の肉厚を薄くすることが可能となる。したがって、内径の拡大が図られた中空の入力軸を提供できる。 According to the input shaft according to one aspect of the present invention, since the mounting portion is arranged on the outer peripheral surface, when the drive component is mounted on the end portion, it is compared with the configuration in which the female screw is formed on the end face of the input shaft as in the prior art. Therefore, it becomes possible to reduce the wall thickness of the input shaft. Therefore, it is possible to provide a hollow input shaft having an enlarged inner diameter.

上記態様の入力軸であって、前記第１支持部と前記第２支持部との間で一定の外径で前記取付部と同じ外径を有する外周部を有していてもよい。 The input shaft of the above aspect may have an outer peripheral portion having a constant outer diameter and the same outer diameter as the mounting portion between the first support portion and the second support portion.

上記態様の入力軸であって、前記取付部は前記駆動部品を相対回転不能に支持してもよい。 In the input shaft of the above aspect, the mounting portion may support the driving component so as not to rotate relative to each other.

上記態様の入力軸であって、前記取付部と前記第１支持部との間の外周面に配置されシール部材にシールされるシール面を備え、前記取付部はスプライン軸であり、前記取付部の外径は前記シール面の外径と等しくてもよい。 The input shaft of the above aspect includes a seal surface arranged on the outer peripheral surface between the mounting portion and the first support portion and sealed by the sealing member, and the mounting portion is a spline shaft and the mounting portion. The outer diameter of the seal surface may be equal to the outer diameter of the sealing surface.

上記態様の入力軸であって、出力部品と噛み合う歯車部を備え、前記取付部はスプライン軸であり、前記取付部の外径は前記歯車部の歯底の径と等しくてもよい。 The input shaft of the above embodiment includes a gear portion that meshes with an output component, the mounting portion is a spline shaft, and the outer diameter of the mounting portion may be equal to the diameter of the tooth bottom of the gear portion.

上記態様の入力軸であって、出力部品と噛み合う最大径の歯車部を備え、前記取付部はスプライン軸であり、前記取付部の外径は前記歯車部の外径以下であってもよい。 The input shaft of the above aspect may include a gear portion having a maximum diameter that meshes with an output component, the mounting portion may be a spline shaft, and the outer diameter of the mounting portion may be equal to or less than the outer diameter of the gear portion.

上記態様の入力軸であって、前記取付部よりも前記第２支持部側の外周面に配置されシール部材にシールされるシール面を備え、前記取付部はスプライン軸であり、前記取付部の溝の底部の外径は前記シール面の外径以上であってもよい。 The input shaft of the above aspect includes a seal surface arranged on the outer peripheral surface of the second support portion side of the mounting portion and sealed by the seal member, and the mounting portion is a spline shaft of the mounting portion. The outer diameter of the bottom of the groove may be equal to or larger than the outer diameter of the sealing surface.

本発明の一態様に係る減速機は、空洞を形成する内周部、第１軸受に支持された第１支持部、第２軸受に支持された第２支持部、前記第１支持部と前記第２支持部との間で一定の外径を有する外周部、および前記第１支持部に対して前記第２支持部とは反対側の外周に形成され駆動部品が取り付けられる取付部を有する入力軸と、前記入力軸の回転を減速する減速機構と、前記減速機構から伝達される前記入力軸の回転力によって回転される出力軸と、を備える。 The speed reducer according to one aspect of the present invention includes an inner peripheral portion forming a cavity, a first support portion supported by a first bearing, a second support portion supported by a second bearing, the first support portion and the above. An input having an outer peripheral portion having a constant outer diameter with the second support portion, and a mounting portion formed on the outer peripheral portion of the first support portion on the opposite side of the second support portion to which a drive component is attached. A shaft, a deceleration mechanism for decelerating the rotation of the input shaft, and an output shaft rotated by the rotational force of the input shaft transmitted from the deceleration mechanism are provided.

本発明の一態様に係る減速機によれば、入力軸の取付部が外周面に配置されるので、端部に駆動部品を取り付ける場合、従来技術のように入力軸の端面に雌ねじを形成する構成と比較して、入力軸の肉厚を薄くすることが可能となる。よって、内径の拡大が図られた中空の入力軸が得られる。したがって、入力軸の内側により多くのケーブル等を通すことが可能な減速機を提供できる。 According to the speed reducer according to one aspect of the present invention, since the mounting portion of the input shaft is arranged on the outer peripheral surface, when the driving component is mounted on the end portion, a female screw is formed on the end face of the input shaft as in the prior art. Compared with the configuration, the wall thickness of the input shaft can be reduced. Therefore, a hollow input shaft having an enlarged inner diameter can be obtained. Therefore, it is possible to provide a speed reducer capable of passing more cables and the like inside the input shaft.

本発明によれば、内径の拡大が図られた中空の入力軸、およびその入力軸を備えた減速機を提供できる。 According to the present invention, it is possible to provide a hollow input shaft having an enlarged inner diameter, and a speed reducer provided with the input shaft.

実施形態に係る減速機の一部を破断した側面図である。It is a side view which broke a part of the speed reducer which concerns on embodiment.

以下、本発明の実施形態に係る入力軸２を備えた減速機１について添付の図面を参照して説明する。本実施形態の減速機１は、例えばロボットアームの関節部等に適用される偏心揺動型の歯車伝動装置である。 Hereinafter, the speed reducer 1 provided with the input shaft 2 according to the embodiment of the present invention will be described with reference to the accompanying drawings. The speed reducer 1 of the present embodiment is an eccentric swing type gear transmission device applied to, for example, a joint portion of a robot arm.

最初に実施形態の減速機１の概略構成について説明する。
図１は、実施形態に係る減速機の一部を破断した側面図である。
図１に示すように、減速機１は、内部に空洞Ｃを有する入力軸２と、入力軸２の回転を減速する減速機構３と、減速機構３から伝達される入力軸２の回転力によって回転される出力軸としてのキャリア４と、減速機構３を収容するケース５と、を備える。減速機１は、入力軸２をケース５に対して回転させ、入力軸２の入力回転から減速した出力回転を得るように、ケース５とキャリア４とを相対回転させる偏心揺動型の歯車伝動装置である。なお、以下の説明では、入力軸２の回転軸線Ｏに沿う方向を軸方向といい、回転軸線Ｏに直交して回転軸線Ｏから放射状に延びる方向を径方向といい、回転軸線Ｏ回りに周回する方向を周方向という。 First, a schematic configuration of the speed reducer 1 of the embodiment will be described.
FIG. 1 is a side view in which a part of the speed reducer according to the embodiment is broken.
As shown in FIG. 1, the speed reducer 1 is based on the input shaft 2 having a cavity C inside, the speed reduction mechanism 3 for decelerating the rotation of the input shaft 2, and the rotational force of the input shaft 2 transmitted from the speed reduction mechanism 3. A carrier 4 as a rotated output shaft and a case 5 accommodating a reduction mechanism 3 are provided. The speed reducer 1 rotates the input shaft 2 with respect to the case 5, and eccentric swing type gear transmission that relatively rotates the case 5 and the carrier 4 so as to obtain a reduced output rotation from the input rotation of the input shaft 2. It is a device. In the following description, the direction along the rotation axis O of the input shaft 2 is referred to as an axial direction, and the direction orthogonal to the rotation axis O and extending radially from the rotation axis O is referred to as a radial direction, and orbits around the rotation axis O. The direction of movement is called the circumferential direction.

減速機１は、全体としての回転軸線Ｏを中心とする円筒状に形成されている。ケース５は、回転軸線Ｏを中心とする円筒状に形成されている。キャリア４は、ケース５の内側に配置されている。キャリア４は、ケース５と同軸の円筒状に形成されている。キャリア４は、軸方向の第１側からケース５に覆われている。キャリア４は、ケース５から軸方向の第２側に突出している。キャリア４は、ケース５に対して回転軸線Ｏ回りに相対回転する。キャリア４は、減速機構３を保持している。 The speed reducer 1 is formed in a cylindrical shape centered on the rotation axis O as a whole. The case 5 is formed in a cylindrical shape centered on the rotation axis O. The carrier 4 is arranged inside the case 5. The carrier 4 is formed in a cylindrical shape coaxial with the case 5. The carrier 4 is covered with a case 5 from the first side in the axial direction. The carrier 4 projects from the case 5 to the second side in the axial direction. The carrier 4 rotates relative to the case 5 about the rotation axis O. The carrier 4 holds the deceleration mechanism 3.

入力軸２は、駆動部品としてのプーリーＰから伝達されたトルクを、出力部品としての減速機構３の歯車に伝達する。ここでいう駆動部品は、入力軸２に対してトルクの伝達方向上流側に配置される部品である。出力部品は、入力軸２に対してトルクの伝達方向の下流側に配置される部品である。入力軸２には、図示しないモータの駆動力がベルトＢおよびプーリーＰを介して入力される。入力軸２は、キャリア４の内側に挿入されている。入力軸２は、キャリア４に対して回転軸線Ｏ回りに相対回転する。入力軸２は、第１軸受６Ａおよび第２軸受６Ｂを介してキャリア４に回転可能に支持されている。第１軸受６Ａおよび第２軸受６Ｂは、互いに軸方向に離間して配置されている。第１軸受６Ａは、第２軸受６Ｂよりも軸方向の第１側に配置されている。 The input shaft 2 transmits the torque transmitted from the pulley P as a drive component to the gear of the reduction mechanism 3 as an output component. The drive component referred to here is a component arranged on the upstream side in the torque transmission direction with respect to the input shaft 2. The output component is a component arranged on the downstream side of the input shaft 2 in the torque transmission direction. A driving force of a motor (not shown) is input to the input shaft 2 via the belt B and the pulley P. The input shaft 2 is inserted inside the carrier 4. The input shaft 2 rotates relative to the carrier 4 around the rotation axis O. The input shaft 2 is rotatably supported by the carrier 4 via the first bearing 6A and the second bearing 6B. The first bearing 6A and the second bearing 6B are arranged so as to be axially separated from each other. The first bearing 6A is arranged on the first side in the axial direction with respect to the second bearing 6B.

入力軸２には、第１シール部材７Ａおよび第２シール部材７Ｂが装着されている。第１シール部材７Ａおよび第２シール部材７Ｂは、第１軸受６Ａおよび第２軸受６Ｂを軸方向の両側から挟むように配置されている。第１シール部材７Ａは、第１軸受６Ａに対して第２軸受６Ｂとは反対側で、ケース５と入力軸２との間に配置されている。第２シール部材７Ｂは、第２軸受６Ｂに対して第１軸受６Ａとは反対側で、キャリア４と入力軸２との間に配置されている。 A first seal member 7A and a second seal member 7B are mounted on the input shaft 2. The first seal member 7A and the second seal member 7B are arranged so as to sandwich the first bearing 6A and the second bearing 6B from both sides in the axial direction. The first seal member 7A is arranged between the case 5 and the input shaft 2 on the side opposite to the second bearing 6B with respect to the first bearing 6A. The second seal member 7B is arranged between the carrier 4 and the input shaft 2 on the side opposite to the first bearing 6A with respect to the second bearing 6B.

続いて第１実施形態の入力軸２の詳細構成について説明する。
入力軸２は、空洞Ｃを形成する内周部１０と、第１軸受６Ａに支持された第１支持部１２と、第２軸受６Ｂに支持された第２支持部１４と、第１支持部１２と第２支持部１４との間で一定の外径を有する外周部１６と、プーリーＰが取り付けられる取付部１８と、減速機構３の歯車（出力部品）と噛み合う歯車部２０と、第１シール部材７Ａにシールされる第１シール面２２と、第２シール部材７Ｂにシールされる第２シール面２４と、を備える。 Subsequently, the detailed configuration of the input shaft 2 of the first embodiment will be described.
The input shaft 2 includes an inner peripheral portion 10 forming the cavity C, a first support portion 12 supported by the first bearing 6A, a second support portion 14 supported by the second bearing 6B, and a first support portion. An outer peripheral portion 16 having a constant outer diameter between the 12 and the second support portion 14, a mounting portion 18 to which the pulley P is mounted, a gear portion 20 that meshes with the gear (output component) of the reduction mechanism 3, and a first A first sealing surface 22 sealed to the sealing member 7A and a second sealing surface 24 sealed to the second sealing member 7B are provided.

内周部１０は、一定の内径で入力軸２の両端部間を軸方向に連続して延びている。内周部１０は、軸方向の両側に開口している。これにより、空洞Ｃは、入力軸２の両端部で入力軸２の外部空間に連続している。 The inner peripheral portion 10 extends continuously in the axial direction between both end portions of the input shaft 2 with a constant inner diameter. The inner peripheral portion 10 is open on both sides in the axial direction. As a result, the cavity C is continuous with the external space of the input shaft 2 at both ends of the input shaft 2.

第１支持部１２は、入力軸２の外周面に配置されている。第１支持部１２には、第１軸受６Ａが装着される。 The first support portion 12 is arranged on the outer peripheral surface of the input shaft 2. The first bearing 6A is mounted on the first support portion 12.

第２支持部１４は、入力軸２の外周面に配置されている。第２支持部１４は、第１支持部１２に対して軸方向の第２側に間隔をあけて配置されている。第２支持部１４には、第２軸受６Ｂが装着される。第２支持部１４の外径は、第１支持部１２の外径と等しい。なお、第２支持部１４の外径は、第１支持部１２の外径よりも小さくてもよい。 The second support portion 14 is arranged on the outer peripheral surface of the input shaft 2. The second support portion 14 is arranged at a distance on the second side in the axial direction with respect to the first support portion 12. The second bearing 6B is mounted on the second support portion 14. The outer diameter of the second support portion 14 is equal to the outer diameter of the first support portion 12. The outer diameter of the second support portion 14 may be smaller than the outer diameter of the first support portion 12.

第２支持部１４には、第１止め輪溝２６が隣接している。第１止め輪溝２６は、第２支持部１４に対して第１支持部１２とは反対側（軸方向の第２側）に形成されている。第１止め輪溝２６には、第２軸受６Ｂの移動を規制する止め輪８Ａが嵌め込まれている。 The first retaining ring groove 26 is adjacent to the second support portion 14. The first retaining ring groove 26 is formed on the side opposite to the first support portion 12 (second side in the axial direction) with respect to the second support portion 14. A retaining ring 8A that regulates the movement of the second bearing 6B is fitted in the first retaining ring groove 26.

外周部１６は、入力軸２の外周面に配置されている。外周部１６は、第１支持部１２と第２支持部１４との間に配置されている。外周部１６は、一定の外径で軸方向に延びている。外周部１６の外径は、第１支持部１２の外径、および第２支持部１４の外径よりも小さい。 The outer peripheral portion 16 is arranged on the outer peripheral surface of the input shaft 2. The outer peripheral portion 16 is arranged between the first support portion 12 and the second support portion 14. The outer peripheral portion 16 extends in the axial direction with a constant outer diameter. The outer diameter of the outer peripheral portion 16 is smaller than the outer diameter of the first support portion 12 and the outer diameter of the second support portion 14.

取付部１８は、入力軸２の外周面に配置されている。取付部１８は、プーリーＰを相対回転不能に支持する。取付部１８は、プーリーＰと嵌め合うスプライン軸（雄スプライン）である。取付部１８は、第１支持部１２に対して第２支持部１４とは反対側に配置されている。 The mounting portion 18 is arranged on the outer peripheral surface of the input shaft 2. The mounting portion 18 supports the pulley P so that it cannot rotate relative to each other. The mounting portion 18 is a spline shaft (male spline) that fits with the pulley P. The mounting portion 18 is arranged on the side opposite to the second support portion 14 with respect to the first support portion 12.

取付部１８には、第２止め輪溝２８が隣接している。第２止め輪溝２８は、取付部１８に対して第１支持部１２とは反対側に形成されている。第２止め輪溝２８には、プーリーＰの移動を規制する止め輪８Ｂが嵌め込まれている。 A second retaining ring groove 28 is adjacent to the mounting portion 18. The second retaining ring groove 28 is formed on the side opposite to the first support portion 12 with respect to the mounting portion 18. A retaining ring 8B that regulates the movement of the pulley P is fitted in the second retaining ring groove 28.

歯車部２０は、入力軸２の外周面に配置されている。歯車部２０は、第１支持部１２に対して外周部１６とは反対側で、第１支持部１２に隣接している。歯車部２０は、第１支持部１２と取付部１８との間に配置されている。歯車部２０は、入力軸２で最大径を有する。歯車部２０の歯底の外径は、第１支持部１２の外径と等しい。歯車部２０には、第１軸受６Ａが軸方向で当接している。 The gear portion 20 is arranged on the outer peripheral surface of the input shaft 2. The gear portion 20 is opposite to the outer peripheral portion 16 with respect to the first support portion 12 and is adjacent to the first support portion 12. The gear portion 20 is arranged between the first support portion 12 and the mounting portion 18. The gear portion 20 has a maximum diameter on the input shaft 2. The outer diameter of the tooth bottom of the gear portion 20 is equal to the outer diameter of the first support portion 12. The first bearing 6A is in axial contact with the gear portion 20.

第１シール面２２は、入力軸２の外周面に配置されている。第１シール面２２は、第１支持部１２と取付部１８との間に配置されている。第１シール面２２は、歯車部２０と取付部１８との間で歯車部２０に対して間隔をあけて配置され、取付部１８に隣接している。第１シール面２２は、一定の外径で軸方向に延びている。 The first seal surface 22 is arranged on the outer peripheral surface of the input shaft 2. The first seal surface 22 is arranged between the first support portion 12 and the mounting portion 18. The first seal surface 22 is arranged between the gear portion 20 and the mounting portion 18 at intervals with respect to the gear portion 20, and is adjacent to the mounting portion 18. The first sealing surface 22 extends in the axial direction with a constant outer diameter.

第２シール面２４は、入力軸２の外周面に配置されている。第２シール面２４は、第２支持部１４に対して外周部１６とは反対側に配置されている。第２シール面２４は、入力軸２における軸方向の第２側の端部に形成されている。第２シール面２４の外径は、第２支持部１４の外径よりも小さい。 The second seal surface 24 is arranged on the outer peripheral surface of the input shaft 2. The second seal surface 24 is arranged on the side opposite to the outer peripheral portion 16 with respect to the second support portion 14. The second seal surface 24 is formed at the end portion of the input shaft 2 on the second side in the axial direction. The outer diameter of the second sealing surface 24 is smaller than the outer diameter of the second support portion 14.

取付部１８の外径は、歯車部２０の外径以下である。さらに、取付部１８の外径は、歯車部２０の歯底の外径と等しい。また、取付部１８の外径は、第１シール面２２の外径と等しい。入力軸２の外径は、第１シール面２２よりも軸方向の第１側の全体で第１シール面２２の外径以下になっている。 The outer diameter of the mounting portion 18 is equal to or less than the outer diameter of the gear portion 20. Further, the outer diameter of the mounting portion 18 is equal to the outer diameter of the tooth bottom of the gear portion 20. Further, the outer diameter of the mounting portion 18 is equal to the outer diameter of the first sealing surface 22. The outer diameter of the input shaft 2 is equal to or less than the outer diameter of the first seal surface 22 on the entire first side in the axial direction with respect to the first seal surface 22.

また、入力軸２の外径は、第１支持部１２よりも軸方向の第２側の全体で、第１支持部１２の外径以下になっている。さらに、入力軸２の外径は、第２支持部１４よりも軸方向の第２側の全体で、第２支持部１４の外径以下になっている。これにより、第１軸受６Ａおよび第２軸受６Ｂを入力軸２の軸方向第２側の端部から装着できる。 Further, the outer diameter of the input shaft 2 is equal to or less than the outer diameter of the first support portion 12 on the entire second side in the axial direction with respect to the first support portion 12. Further, the outer diameter of the input shaft 2 is equal to or less than the outer diameter of the second support portion 14 on the entire second side in the axial direction with respect to the second support portion 14. As a result, the first bearing 6A and the second bearing 6B can be mounted from the end portion of the input shaft 2 on the second side in the axial direction.

以上に説明したように、本実施形態の入力軸２では、取付部１８が外周面に配置される。この構成によれば、入力軸の端部にプーリーＰを取り付ける場合、従来技術のように入力軸の端面に雌ねじを形成する構成と比較して、入力軸２の肉厚を薄くすることが可能となる。したがって、内径の拡大が図られた中空の入力軸２を提供できる。そして、本実施形態の減速機１は、上述した入力軸２を備えるので、入力軸２の内側により多くのケーブル等を通すことが可能となる。 As described above, in the input shaft 2 of the present embodiment, the mounting portion 18 is arranged on the outer peripheral surface. According to this configuration, when the pulley P is attached to the end of the input shaft, the wall thickness of the input shaft 2 can be reduced as compared with the configuration in which a female screw is formed on the end face of the input shaft as in the prior art. It becomes. Therefore, it is possible to provide a hollow input shaft 2 having an enlarged inner diameter. Since the speed reducer 1 of the present embodiment includes the input shaft 2 described above, it is possible to pass more cables and the like inside the input shaft 2.

また、入力軸２は、第１支持部１２と第２支持部１４との間で一定の外径を有する外周部１６を備える。外周部１６の外径は第１支持部１２の外径より小さいので、第１軸受６Ａを第２支持部１４側から外周部１６を通過させて第１支持部１２に装着することができる。これにより、第１支持部１２に対して第２支持部１４とは反対側で入力軸２の外径を第１支持部１２の外径よりも大きくできるので、入力軸２の内径の更なる拡大を図ることができる。 Further, the input shaft 2 includes an outer peripheral portion 16 having a constant outer diameter between the first support portion 12 and the second support portion 14. Since the outer diameter of the outer peripheral portion 16 is smaller than the outer diameter of the first support portion 12, the first bearing 6A can be mounted on the first support portion 12 by passing the outer peripheral portion 16 from the second support portion 14 side. As a result, the outer diameter of the input shaft 2 can be made larger than the outer diameter of the first support portion 12 on the side opposite to the second support portion 14 with respect to the first support portion 12, so that the inner diameter of the input shaft 2 is further increased. It can be expanded.

また、取付部１８は、プーリーＰを相対回転不能に支持する。この構成によれば、取付部１８を設けたことで従来技術のような締結構造を省略でき、上述した作用効果を奏することができる。 Further, the mounting portion 18 supports the pulley P so that it cannot rotate relative to each other. According to this configuration, by providing the mounting portion 18, the fastening structure as in the prior art can be omitted, and the above-described effects can be obtained.

また、入力軸２は、取付部１８と第１支持部１２との間の外周面に配置され第１シール部材７Ａにシールされる第１シール面２２を備える。取付部１８は、スプライン軸である。取付部１８の外径は、第１シール面２２の外径と等しい。ここで、取付部を通過させて第１シール部材を第１シール面に装着する際に、取付部の外径が第１シール面の外径よりも大きいと第１シール部材が損傷する可能性がある。上記構成によれば、取付部１８を通過させて第１シール部材７Ａを第１シール面２２に装着する際に、第１シール部材７Ａが損傷することを抑制できる。 Further, the input shaft 2 includes a first sealing surface 22 which is arranged on the outer peripheral surface between the mounting portion 18 and the first supporting portion 12 and is sealed by the first sealing member 7A. The mounting portion 18 is a spline shaft. The outer diameter of the mounting portion 18 is equal to the outer diameter of the first sealing surface 22. Here, when the first sealing member is mounted on the first sealing surface by passing through the mounting portion, if the outer diameter of the mounting portion is larger than the outer diameter of the first sealing surface, the first sealing member may be damaged. There is. According to the above configuration, it is possible to prevent the first seal member 7A from being damaged when the first seal member 7A is mounted on the first seal surface 22 by passing through the mounting portion 18.

また、取付部１８の外径が第１シール面２２の外径と等しいので、取付部の外径が第１シール面の外径よりも小さい場合と比較して、取付部１８の溝の底部の外径を第１シール面２２の外径に近付けることができる。これにより、取付部１８における入力軸２の肉厚が第１シール面２２における入力軸２の肉厚に対して極端に薄くなることを抑制できる。したがって、入力軸２の強度の低下を抑制しつつ、入力軸２の内径の拡大を図ることができる。 Further, since the outer diameter of the mounting portion 18 is equal to the outer diameter of the first sealing surface 22, the bottom of the groove of the mounting portion 18 is compared with the case where the outer diameter of the mounting portion is smaller than the outer diameter of the first sealing surface. The outer diameter of is close to the outer diameter of the first sealing surface 22. As a result, it is possible to prevent the wall thickness of the input shaft 2 in the mounting portion 18 from becoming extremely thin with respect to the wall thickness of the input shaft 2 on the first sealing surface 22. Therefore, it is possible to increase the inner diameter of the input shaft 2 while suppressing the decrease in the strength of the input shaft 2.

また、入力軸２は、減速機構３の歯車と噛み合う歯車部２０を備える。取付部１８は、スプライン軸である。取付部１８の外径は、歯車部２０の歯底の径と等しい。この構成によれば、歯車部２０の歯底と取付部１８の外周とを同時に加工できる。よって、入力軸２の加工が容易になるので、入力軸２の製造コストの低減を図ることができる。 Further, the input shaft 2 includes a gear portion 20 that meshes with the gear of the reduction mechanism 3. The mounting portion 18 is a spline shaft. The outer diameter of the mounting portion 18 is equal to the diameter of the tooth bottom of the gear portion 20. According to this configuration, the tooth bottom of the gear portion 20 and the outer circumference of the mounting portion 18 can be processed at the same time. Therefore, the processing of the input shaft 2 becomes easy, and the manufacturing cost of the input shaft 2 can be reduced.

また、入力軸２は、減速機構３の歯車と噛み合う最大径の歯車部２０を備える。取付部１８は、スプライン軸である。取付部１８の外径は、歯車部２０の外径以下である。ここで、取付部の外径が歯車部の外径よりも大きい構成と歯車部の外径以下の構成とを比較すると、歯車部の外径を同一とした場合、取付部の外径が歯車部の外径よりも大きい構成では入力軸の材料となる管材の外径および肉厚が大きくなる。よって、本実施形態によれば、比較的外径が小さく安価な管材を使用できるとともに、加工も容易になるので、入力軸２の製造コストの低減を図ることができる。 Further, the input shaft 2 includes a gear portion 20 having a maximum diameter that meshes with the gear of the reduction mechanism 3. The mounting portion 18 is a spline shaft. The outer diameter of the mounting portion 18 is equal to or less than the outer diameter of the gear portion 20. Here, comparing a configuration in which the outer diameter of the mounting portion is larger than the outer diameter of the gear portion and a configuration in which the outer diameter of the gear portion is smaller than the outer diameter of the gear portion, when the outer diameter of the gear portion is the same, the outer diameter of the mounting portion is the gear. If the configuration is larger than the outer diameter of the portion, the outer diameter and wall thickness of the pipe material used as the material of the input shaft will be large. Therefore, according to the present embodiment, a pipe material having a relatively small outer diameter and being inexpensive can be used, and processing becomes easy, so that the manufacturing cost of the input shaft 2 can be reduced.

なお、上記実施形態では、取付部１８の外径が第１シール面２２と等しい。しかしながらこれに限定されず、取付部の溝の底部の外径が第１シール面の外径以上であってもよい。これにより、取付部における入力軸の肉厚を第１シール面における入力軸の肉厚と同等以上にすることができる。よって、入力軸の内径を第１シール面の外径に近付けるようにして、入力軸の内径の更なる拡大を図ることができる。 In the above embodiment, the outer diameter of the mounting portion 18 is equal to that of the first sealing surface 22. However, the present invention is not limited to this, and the outer diameter of the bottom portion of the groove of the mounting portion may be equal to or larger than the outer diameter of the first sealing surface. As a result, the wall thickness of the input shaft at the mounting portion can be made equal to or greater than the wall thickness of the input shaft on the first sealing surface. Therefore, the inner diameter of the input shaft can be further increased by bringing the inner diameter of the input shaft closer to the outer diameter of the first sealing surface.

また、上記実施形態では、取付部１８の外径は歯車部２０の歯底の外径と等しく、歯車部２０の歯底の外径は第１支持部１２の外径と等しく、外周部１６の外径は第１支持部１２の外径よりも小さい。すなわち、外周部１６は、取付部１８よりも小さい外径を有する。しかしながらこれに限定されず、外周部は取付部と同じ外径を有していてもよい。これにより、外周部が取付部よりも小さい外径を有している場合と比較して、外周部における入力軸の肉厚が取付部における入力軸の肉厚に対して極端に薄くなることを抑制できる。したがって、入力軸の内径の拡大を図ることができる。 Further, in the above embodiment, the outer diameter of the mounting portion 18 is equal to the outer diameter of the tooth bottom of the gear portion 20, the outer diameter of the tooth bottom of the gear portion 20 is equal to the outer diameter of the first support portion 12, and the outer diameter portion 16 The outer diameter of is smaller than the outer diameter of the first support portion 12. That is, the outer peripheral portion 16 has an outer diameter smaller than that of the mounting portion 18. However, the present invention is not limited to this, and the outer peripheral portion may have the same outer diameter as the mounting portion. As a result, the wall thickness of the input shaft at the outer peripheral portion becomes extremely thinner than the wall thickness of the input shaft at the mounting portion, as compared with the case where the outer peripheral portion has an outer diameter smaller than that of the mounting portion. Can be suppressed. Therefore, the inner diameter of the input shaft can be increased.

なお、本発明は、図面を参照して説明した上述の実施形態に限定されるものではなく、その技術的範囲において様々な変形例が考えられる。
例えば、上記実施形態では、取付部１８にプーリーＰが取り付けられているが、これに限定されず、例えば歯車が取り付けられてもよい。 The present invention is not limited to the above-described embodiment described with reference to the drawings, and various modifications can be considered within the technical scope thereof.
For example, in the above embodiment, the pulley P is attached to the attachment portion 18, but the present invention is not limited to this, and for example, a gear may be attached.

また、上記実施形態では、取付部１８はスプライン軸である。しかしながら取付部の構造はこれに限定されない。例えば、取付部は、入力軸、およびプーリー等の駆動部品の両方に組み付けられるキーが入り込むキー溝を備えていてもよい。また、取付部は、駆動部品の一部が嵌り込む凹部を備えてもよい。また、取付部は、駆動部品の内周面に設けられた凹部に嵌り込む凸部を備えてもよい。 Further, in the above embodiment, the mounting portion 18 is a spline shaft. However, the structure of the mounting portion is not limited to this. For example, the mounting portion may include a keyway into which a key to be assembled to both the input shaft and a drive component such as a pulley enters. Further, the mounting portion may be provided with a recess into which a part of the driving component is fitted. Further, the mounting portion may be provided with a convex portion that fits into a concave portion provided on the inner peripheral surface of the drive component.

その他、本発明の趣旨を逸脱しない範囲で、上記した実施の形態における構成要素を周知の構成要素に置き換えることは適宜可能である。 In addition, it is possible to replace the components in the above-described embodiment with well-known components as appropriate without departing from the spirit of the present invention.

１…減速機 ２…入力軸 ３…減速機構（出力部品） ６Ａ…第１軸受 ６Ｂ…第２軸受 ７Ａ…第１シール部材（シール部材） １０…内周部 １２…第１支持部 １４…第２支持部 １６…外周部 １８…取付部 ２０…歯車部 ２２…第１シール面 Ｃ…空洞 Ｐ…プーリー（駆動部品） 1 ... Reducer 2 ... Input shaft 3 ... Reduction mechanism (output part) 6A ... 1st bearing 6B ... 2nd bearing 7A ... 1st seal member (seal member) 10 ... Inner circumference 12 ... 1st support 14 ... 1st 2 Support part 16 ... Outer part 18 ... Mounting part 20 ... Gear part 22 ... First seal surface C ... Cavity P ... Pulley (driving part)

Claims (8)

第１軸受および第２軸受に支持され駆動部品を介して駆動され内部に空洞を有する入力軸であって、
前記第１軸受に支持される第１支持部と、
前記第２軸受に支持される第２支持部と、
前記第１支持部に対して前記第２支持部とは反対側の外周面に配置され前記駆動部品が取り付けられる取付部と、
を有する入力軸。 An input shaft supported by a first bearing and a second bearing, driven via a driving component, and having a cavity inside.
The first support portion supported by the first bearing and
A second support portion supported by the second bearing and
A mounting portion arranged on the outer peripheral surface opposite to the second support portion with respect to the first support portion and to which the driving component is mounted, and a mounting portion.
Input axis with. 前記第１支持部と前記第２支持部との間で一定の外径で前記取付部と同じ外径を有する外周部を有する請求項１に記載の入力軸。 The input shaft according to claim 1, wherein an outer peripheral portion having a constant outer diameter and the same outer diameter as the mounting portion is provided between the first support portion and the second support portion. 前記取付部は前記駆動部品を相対回転不能に支持する
請求項１または請求項２に記載の入力軸。 The input shaft according to claim 1 or 2, wherein the mounting portion supports the driving component so as to be relatively non-rotatable. 前記取付部と前記第１支持部との間の外周面に配置されシール部材にシールされるシール面を備え、
前記取付部はスプライン軸であり、
前記取付部の外径は前記シール面の外径と等しい
請求項１から請求項３のいずれか１項に記載の入力軸。 It is provided with a sealing surface arranged on the outer peripheral surface between the mounting portion and the first supporting portion and sealed by the sealing member.
The mounting portion is a spline shaft and
The input shaft according to any one of claims 1 to 3, wherein the outer diameter of the mounting portion is equal to the outer diameter of the sealing surface. 出力部品と噛み合う歯車部を備え、
前記取付部はスプライン軸であり、
前記取付部の外径は前記歯車部の歯底の径と等しい
請求項１から請求項４のいずれか１項に記載の入力軸。 Equipped with a gear part that meshes with output parts
The mounting portion is a spline shaft and
The input shaft according to any one of claims 1 to 4, wherein the outer diameter of the mounting portion is equal to the diameter of the tooth bottom of the gear portion. 出力部品と噛み合う最大径の歯車部を備え、
前記取付部はスプライン軸であり、
前記取付部の外径は前記歯車部の外径以下である
請求項１から請求項５のいずれか１項に記載の入力軸。 Equipped with a gear part with the maximum diameter that meshes with output parts
The mounting portion is a spline shaft and
The input shaft according to any one of claims 1 to 5, wherein the outer diameter of the mounting portion is equal to or less than the outer diameter of the gear portion. 前記取付部よりも前記第２支持部側の外周面に配置されシール部材にシールされるシール面を備え、
前記取付部はスプライン軸であり、
前記取付部の溝の底部の外径は前記シール面の外径以上である
請求項１から請求項６のいずれか１項に記載の入力軸。 It has a sealing surface that is arranged on the outer peripheral surface of the second support portion side of the mounting portion and is sealed by the sealing member.
The mounting portion is a spline shaft and
The input shaft according to any one of claims 1 to 6, wherein the outer diameter of the bottom of the groove of the mounting portion is equal to or larger than the outer diameter of the sealing surface. 空洞を形成する内周部、第１軸受に支持された第１支持部、第２軸受に支持された第２支持部、前記第１支持部と前記第２支持部との間で一定の外径を有する外周部、および前記第１支持部に対して前記第２支持部とは反対側の外周に形成され駆動部品が取り付けられる取付部を有する入力軸と、
前記入力軸の回転を減速する減速機構と、
前記減速機構から伝達される前記入力軸の回転力によって回転される出力軸と、
を備える減速機。 An inner peripheral portion forming a cavity, a first support portion supported by a first bearing, a second support portion supported by a second bearing, and a constant outside between the first support portion and the second support portion. An input shaft having an outer peripheral portion having a diameter and a mounting portion formed on the outer peripheral portion opposite to the second support portion with respect to the first support portion and to which a drive component is mounted.
A deceleration mechanism that decelerates the rotation of the input shaft,
An output shaft rotated by the rotational force of the input shaft transmitted from the reduction mechanism, and
A reducer equipped with.
JP2019096986A 2019-05-23 2019-05-23 Input shaft and reducer Active JP7373919B2 (en)

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