JP2010001966A - Rotating shaft coupling, and rotation drive with worm reducer - Google Patents

Rotating shaft coupling, and rotation drive with worm reducer Download PDF

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JP2010001966A
JP2010001966A JP2008161292A JP2008161292A JP2010001966A JP 2010001966 A JP2010001966 A JP 2010001966A JP 2008161292 A JP2008161292 A JP 2008161292A JP 2008161292 A JP2008161292 A JP 2008161292A JP 2010001966 A JP2010001966 A JP 2010001966A
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shaft
worm
spline
spline hole
preload
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JP2010001966A5 (en
JP5217676B2 (en
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Toshiichi Kajikawa
敏一 梶川
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NSK Ltd
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NSK Ltd
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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
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D3/00—Yielding couplings, i.e. with means permitting movement between the connected parts during the drive
    • F16D3/50—Yielding couplings, i.e. with means permitting movement between the connected parts during the drive with the coupling parts connected by one or more intermediate members
    • F16D3/76—Yielding couplings, i.e. with means permitting movement between the connected parts during the drive with the coupling parts connected by one or more intermediate members shaped as an elastic ring centered on the axis, surrounding a portion of one coupling part and surrounded by a sleeve of the other coupling part
    • 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
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D1/00—Couplings for rigidly connecting two coaxial shafts or other movable machine elements
    • F16D1/10—Quick-acting couplings in which the parts are connected by simply bringing them together axially
    • F16D1/101—Quick-acting couplings in which the parts are connected by simply bringing them together axially without axial retaining means rotating with the coupling

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Power Steering Mechanism (AREA)
  • Gear Transmission (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To provide a structure can prevent elastic bend deformation of a shaft preload part 20a of elastic material to a spline shaft part 12a provided on a chip part of an output shaft 10 of an electric motor when a spline hole 11b provided at a base end of a worm 8 is inclined. <P>SOLUTION: For a depth end face 24a of the spline hole 11b and a chip face 25 of the shaft preload part 20a, which are in contact with each other, the depth end face 24a is formed as a partially spherical recessed surface, and the chip face 25 is formed as a partially spherical projected surface having the same radius of curvature as the depth end face 24a. In this constitution, a contact position of the chip face 25 to the depth end face 24a moves, so that the problem is solved. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

この発明は、例えば電動式パワーステアリング装置として使用可能なウォーム減速機付回転駆動装置と、これに組み込んで使用可能な回転軸継手との改良に関する。   The present invention relates to an improvement of a rotary drive device with a worm speed reducer that can be used as, for example, an electric power steering device, and a rotary shaft joint that can be used by being incorporated therein.

操舵輪（フォークリフト等の特殊車両を除き、通常は前輪）に舵角を付与する際に運転者がステアリングホイールを操作する為に要する力の軽減を図る為の装置として、パワーステアリング装置が広く使用されている。又、この様なパワーステアリング装置で、補助動力源として電動モータを使用する電動式パワーステアリング装置も、近年普及し始めている。この様な電動式パワーステアリング装置の構造は、各種知られているが、何れの構造の場合でも、ステアリングホイールの操作によって回転させられ、回転に伴って操舵輪に舵角を付与する回転軸に電動モータの補助動力を、減速機を介して付与する。この減速機として一般的には、ウォーム減速機が使用されている。ウォーム減速機を使用した電動式パワーステアリング装置の場合、上記電動モータにより回転駆動されるウォームと、上記回転軸と共に回転するウォームホイールとを噛合させて、上記電動モータの補助動力をこの回転軸に伝達自在とする。   A power steering device is widely used as a device to reduce the force required for the driver to operate the steering wheel when giving a steering angle to the steered wheels (usually the front wheels except for special vehicles such as forklifts) Has been. In addition, an electric power steering apparatus that uses an electric motor as an auxiliary power source in such a power steering apparatus has begun to spread in recent years. Various structures of such an electric power steering apparatus are known, but in any structure, a rotating shaft that is rotated by the operation of the steering wheel and gives a steered angle to the steered wheels as it rotates. Auxiliary power of the electric motor is applied through a speed reducer. In general, a worm reducer is used as the reducer. In the case of an electric power steering device using a worm speed reducer, a worm that is rotationally driven by the electric motor and a worm wheel that rotates together with the rotating shaft are engaged with each other, and auxiliary power of the electric motor is applied to the rotating shaft. Communicate freely.

例えば特許文献１には、図６〜７に示す様な電動式パワーステアリング装置が記載されている。ステアリングホイール１により所定方向に回転させられる、被駆動軸であるステアリングシャフト２の前端部は、ハウジング３の内側に回転自在に支持しており、この部分にウォームホイール４を固定している。このウォームホイール４と噛合するウォーム歯５をウォーム軸６の軸方向中間部に設け、回転駆動装置である電動モータ７により回転駆動されるウォーム８の両端部は、深溝型玉軸受等の１対の転がり軸受９ａ、９ｂにより、上記ハウジング３内に回転自在に支持されている。上記ウォーム８を上記電動モータ７の駆動軸である出力軸１０により回転駆動する為に、上記ウォーム軸６の基端部（図７の右端部）にスプライン孔１１を、このウォーム軸６の基端面に開口する状態で形成している。又、上記出力軸１０の先端部にスプライン軸部１２を形成している。そして、このスプライン軸部１２と上記スプライン孔１１とをスプライン係合させる事で、上記出力軸１０と上記ウォーム軸６とを、回転力の伝達を自在に結合している。   For example, Patent Document 1 describes an electric power steering device as shown in FIGS. A front end portion of a steering shaft 2 that is a driven shaft and is rotated in a predetermined direction by the steering wheel 1 is rotatably supported inside the housing 3, and the worm wheel 4 is fixed to this portion. The worm teeth 5 that mesh with the worm wheel 4 are provided in the axially intermediate portion of the worm shaft 6, and both ends of the worm 8 that is rotationally driven by the electric motor 7 that is a rotational drive device are a pair of deep groove ball bearings or the like. Are rotatably supported in the housing 3 by rolling bearings 9a and 9b. In order to rotationally drive the worm 8 by the output shaft 10 which is the drive shaft of the electric motor 7, a spline hole 11 is formed at the base end portion (right end portion in FIG. 7) of the worm shaft 6 and the base of the worm shaft 6. It forms in the state opened to an end surface. A spline shaft 12 is formed at the tip of the output shaft 10. The spline shaft portion 12 and the spline hole 11 are spline-engaged so that the output shaft 10 and the worm shaft 6 are freely coupled to transmit rotational force.

更に、図７に示した従来構造の場合、上記ウォームホイール４と上記ウォーム歯５との噛合部のバックラッシュをなくす為に、上記ウォーム軸６の先端部（図７の左端部）を上記ウォームホイール４に向け弾性的に押圧する様にしている。即ち、上記ウォーム軸６の先端部で先端側の転がり軸受９ａよりも突出した部分に押圧駒１３を外嵌し、この押圧駒１３と上記ハウジング３との間にコイルばね１４等の弾性部材を設けている。そして、このコイルばね１４により、上記押圧駒１３を介して、上記ウォーム歯５を上記ウォームホイール４に向け押圧している。この様な構成により、これらウォーム歯５とウォームホイール４との間のバックラッシュを抑え、上記電動モータ７の起動時や回転方向の切り換え時に、上記ウォームホイール４と上記ウォーム歯５との噛合部での歯打ち音の発生を抑えられる様にしている。   Further, in the case of the conventional structure shown in FIG. 7, in order to eliminate backlash at the meshing portion between the worm wheel 4 and the worm tooth 5, the tip portion (the left end portion in FIG. 7) of the worm shaft 6 is connected to the worm wheel. The wheel 4 is elastically pressed toward the wheel 4. That is, the pressing piece 13 is externally fitted to a portion protruding from the leading end side rolling bearing 9 a at the tip of the worm shaft 6, and an elastic member such as a coil spring 14 is provided between the pressing piece 13 and the housing 3. Provided. The worm teeth 5 are pressed against the worm wheel 4 by the coil spring 14 via the pressing piece 13. With such a configuration, backlash between the worm teeth 5 and the worm wheel 4 is suppressed, and the meshing portion between the worm wheel 4 and the worm teeth 5 when the electric motor 7 is started or when the rotation direction is switched. The generation of rattling noise in the case is suppressed.

上述の様な電動式パワーステアリング装置では、上記ウォームホイール４と上記ウォーム歯５との噛合部での歯打ち音の発生を抑えられるが、上記スプライン軸部１２と上記スプライン孔１１とのスプライン係合部での歯打ち音の発生は抑えられない。特に、このスプライン係合部には、或る程度隙間を設ける必要がある。この理由は、上記スプライン孔１１と上記スプライン軸部１２とをスプライン係合させる作業を容易に行える様にする為であり、更には、上記ウォームホイール４と上記ウォーム歯５との間のバックラッシュを抑えるべく、上記ウォーム軸６の先端部を上記ウォームホイール４に向け揺動変位させられる様にする為である。これらの理由により設けられる、上記スプライン係合部の隙間に基づいて、上記電動モータ７の起動時や回転方向の切り換え時に、このスプライン係合部で、雄スプライン歯の側面と雌スプライン歯の側面との衝突に基づく、騒音や振動が発生する。   In the electric power steering apparatus as described above, it is possible to suppress the occurrence of rattling noise at the meshing portion between the worm wheel 4 and the worm tooth 5, but the spline engagement between the spline shaft portion 12 and the spline hole 11. Generation of rattling noise at the joint cannot be suppressed. In particular, it is necessary to provide a certain gap in the spline engaging portion. The reason for this is to make it easy to perform spline engagement between the spline hole 11 and the spline shaft portion 12, and further, backlash between the worm wheel 4 and the worm teeth 5. This is because the tip end portion of the worm shaft 6 can be oscillated and displaced toward the worm wheel 4. Based on the gap between the spline engaging portions provided for these reasons, the side surfaces of the male spline teeth and the side surfaces of the female spline teeth are formed at the spline engaging portions when the electric motor 7 is started or when the rotation direction is switched. Noise and vibration are generated based on the collision with

この様な不具合の発生を有効に防止できる構造として、特願２００７−２０３４５０には、図８〜９に示す様な構造が開示されている。この図８〜９に示した先発明の構造の場合も、上述した従来構造の場合と同様、ウォーム軸６の基端部にスプライン孔１１ａを、このウォーム軸６の基端面に開口する状態で、このウォーム軸６と同心に形成している。又、電動モータ７（図７参照）の出力軸１０の先端部にスプライン軸部１２ａを、この出力軸１０と同心に形成している。そして、このスプライン軸部１２ａと上記スプライン孔１１ａとをスプライン係合させる事で、上記出力軸１０と上記ウォーム軸６とを、回転力の伝達を可能に結合している。   Japanese Patent Application No. 2007-203450 discloses a structure as shown in FIGS. 8 to 9 as a structure that can effectively prevent the occurrence of such a problem. In the case of the structure of the prior invention shown in FIGS. 8 to 9, the spline hole 11 a is opened at the base end portion of the worm shaft 6 and the base end surface of the worm shaft 6 is opened as in the case of the conventional structure described above. The worm shaft 6 is formed concentrically. Further, a spline shaft portion 12 a is formed concentrically with the output shaft 10 at the distal end portion of the output shaft 10 of the electric motor 7 (see FIG. 7). The spline shaft portion 12a and the spline hole 11a are spline-engaged to couple the output shaft 10 and the worm shaft 6 so as to be able to transmit rotational force.

上記スプライン軸部１２ａは、先半部を小径部１５とし、基半部を大径部１６としている。これら小径部１５及び大径部１６の外周面に形成した雄スプライン歯と、上記スプライン孔１１ａの内周面に形成した雌スプライン歯とは、相似形であるが、大きさは異なる。即ち、このスプライン孔１１ａの内周面の大きさに比べて、上記小径部１５の外周面の大きさを十分に小さくすると共に、上記大径部１６の外周面の大きさを少しだけ小さくしている。そして、上記小径部１５の外周面と上記スプライン孔１１ａの内周面との間、及び、上記スプライン軸部１２ａの先端面２３と上記スプライン孔１１ａの奥端面２４との間に、弾性部材１７を設置すると共に、上記大径部１５を上記スプライン孔１１ａに、小さな隙間を介してスプライン係合させている。   The spline shaft portion 12 a has a tip half portion as a small diameter portion 15 and a base half portion as a large diameter portion 16. The male spline teeth formed on the outer peripheral surfaces of the small-diameter portion 15 and the large-diameter portion 16 and the female spline teeth formed on the inner peripheral surface of the spline hole 11a are similar, but different in size. That is, the size of the outer peripheral surface of the small diameter portion 15 is made sufficiently smaller than the size of the inner peripheral surface of the spline hole 11a, and the size of the outer peripheral surface of the large diameter portion 16 is slightly reduced. ing. And between the outer peripheral surface of the said small diameter part 15 and the inner peripheral surface of the said spline hole 11a, and between the front end surface 23 of the said spline shaft part 12a, and the back end surface 24 of the said spline hole 11a, the elastic member 17 is provided. The large-diameter portion 15 is spline-engaged with the spline hole 11a through a small gap.

上記弾性部材１７は、全体を、ニトリルゴム、シリコンゴム、ウレタンゴム、エチレンアクリルゴム、水素添加ニトリルゴム等のゴム、或いはポリウレタンの如き熱可塑性エラストマー、合成樹脂等の弾性材により一体に造られたもので、緩衝部材である緩衝筒部１８と、連結部１９と、軸予圧部材である軸予圧部２０とから成る。このうちの緩衝筒部１８は、上記スプライン軸部１２ａの小径部１５に外嵌可能なもので、この小径部１５の外周面形状に合わせて、六つ星筒状に形成している。この緩衝筒部１８の内周面の自由状態での大きさは、好ましくは、上記小径部１５の外周面の大きさよりも僅かに小さくして、上記緩衝筒部１８をこの小径部１５に、軽い締り嵌めで外嵌できる様にしている。又、この緩衝筒部１８の外周面の大きさは、上記大径部１６の外周面の大きさよりも少しだけ大きくすると共に、上記スプライン孔１１ａの内周面のよりも僅かに大きく乃至は僅かに小さくしている。これにより、上記緩衝筒部１８を上記スプライン孔１１ａに、軽い締り嵌め乃至は隙間嵌により内嵌できる様にしている。電動式パワーステアリング装置を組み立てた状態で、この様な緩衝筒部１８は、上記小径部１５の外周面と上記スプライン孔１１ａの内周面との間に設置される。   The elastic member 17 is integrally made of rubber such as nitrile rubber, silicon rubber, urethane rubber, ethylene acrylic rubber, hydrogenated nitrile rubber, or an elastic material such as thermoplastic elastomer such as polyurethane or synthetic resin. It consists of a buffer cylinder portion 18 that is a buffer member, a connecting portion 19, and a shaft preload portion 20 that is a shaft preload member. Among these, the buffer cylinder portion 18 can be externally fitted to the small diameter portion 15 of the spline shaft portion 12a, and is formed in a six star cylinder shape according to the outer peripheral surface shape of the small diameter portion 15. The size of the inner peripheral surface of the buffer cylinder portion 18 in the free state is preferably slightly smaller than the size of the outer peripheral surface of the small diameter portion 15, so that the buffer cylinder portion 18 is connected to the small diameter portion 15. It is designed to be fitted with a light interference fit. In addition, the size of the outer peripheral surface of the buffer cylinder 18 is slightly larger than the size of the outer peripheral surface of the large diameter portion 16, and is slightly larger or slightly larger than the inner peripheral surface of the spline hole 11a. To make it smaller. Thereby, the buffer cylinder 18 can be fitted into the spline hole 11a by a light interference fit or a gap fit. In the state in which the electric power steering apparatus is assembled, such a buffer cylinder portion 18 is installed between the outer peripheral surface of the small diameter portion 15 and the inner peripheral surface of the spline hole 11a.

又、上記連結部１９は、上記緩衝筒部１８の先端側開口を塞ぐ状態で設けられており、上記軸予圧部２０は、この様な連結部１９の内周縁部から、上記緩衝筒部１８と軸方向反対側に突出する状態で形成している。図示の例の場合、上記軸予圧部２０を、先端側が塞がれた、有底円筒状としている。電動式パワーステアリング装置を組み立てた状態で、この様な軸予圧部２０は、上記スプライン軸部１２ａの先端面２３と上記スプライン孔１１ａの奥端面２４との間に、軸方向に弾性的に圧縮された状態で設置される。尚、上記軸予圧部２０は、上述の様に中心部まで弾性が詰まっていない、中空体とする他、中心部まで弾性材が詰まった、中実体とする事もできる。中空体とするか、中実体とするかは、必要とする弾性の大きさ等に応じて設計的配慮で選択する。   The connecting portion 19 is provided so as to close the opening on the front end side of the buffer cylinder portion 18, and the shaft preload portion 20 extends from the inner peripheral edge portion of the connecting portion 19 to the buffer cylinder portion 18. And projecting in the opposite axial direction. In the case of the illustrated example, the shaft preload portion 20 has a bottomed cylindrical shape with the tip side closed. With the electric power steering device assembled, such a shaft preload portion 20 is elastically compressed in the axial direction between the tip surface 23 of the spline shaft portion 12a and the back end surface 24 of the spline hole 11a. Installed. The shaft preload portion 20 may be a hollow body that is not clogged with elasticity to the center as described above, or a solid body that is clogged with an elastic material to the center. Whether it is a hollow body or a solid body is selected by design consideration according to the required elasticity.

上述の様に構成する先発明の電動式パワーステアリング装置の場合には、電動モータ７からステアリングシャフト２（図７参照）に補助動力を付与する際に、次の様にして、この電動モータ７の出力軸１０からウォーム８にトルクを伝達する。先ず、上記補助動力が小さい場合には、スプライン軸部１２ａの小径部１５とスプライン孔１１ａとの間に設置した、弾性部材１７の緩衝筒部１８を介して、上記出力軸１０から上記ウォーム８にトルクを伝達する。この際、上記スプライン軸部１２ａの大径部１６の外周面に設けた雄スプライン歯の側面と、上記スプライン孔１１ａの内周面に設けた雌スプライン歯の側面とは当接しない。これに対して、上記補助動力が大きくなると、上記緩衝筒部１８の円周方向に関する弾性変形量が増大し、上記大径部１６の外周面に設けた雄スプライン歯の側面と、上記スプライン孔１１ａの内周面に設けた雌スプライン歯の側面とが当接する。この状態では、上記大径部１６と上記スプライン孔１１ａとのスプライン係合部が、上記緩衝筒部１８の弾力で伝達し切れないトルクを伝達する。上記補助動力が大きくなる過程で、上記雄スプライン歯の側面と上記雌スプライン歯の側面とが衝突するが、この衝突は、上記緩衝筒部１８の弾力に基づいて、緩徐に行なわれる。この為、この衝突によって、歯打ち音と呼ばれる騒音や振動が発生する事を、有効に防止できる。   In the case of the electric power steering device of the prior invention configured as described above, when the auxiliary power is applied from the electric motor 7 to the steering shaft 2 (see FIG. 7), the electric motor 7 is as follows. Torque is transmitted from the output shaft 10 to the worm 8. First, when the auxiliary power is small, the worm 8 is connected to the worm 8 from the output shaft 10 via the buffer cylinder portion 18 of the elastic member 17 installed between the small diameter portion 15 of the spline shaft portion 12a and the spline hole 11a. Torque is transmitted to At this time, the side surface of the male spline tooth provided on the outer peripheral surface of the large diameter portion 16 of the spline shaft portion 12a does not contact the side surface of the female spline tooth provided on the inner peripheral surface of the spline hole 11a. On the other hand, when the auxiliary power increases, the amount of elastic deformation in the circumferential direction of the buffer cylinder 18 increases, and the side surface of the male spline teeth provided on the outer peripheral surface of the large diameter portion 16 and the spline hole The side surface of the female spline teeth provided on the inner peripheral surface of 11a abuts. In this state, the spline engaging portion between the large-diameter portion 16 and the spline hole 11a transmits torque that cannot be transmitted by the elasticity of the buffer cylinder portion 18. In the process of increasing the auxiliary power, the side surface of the male spline tooth and the side surface of the female spline tooth collide, but this collision is performed slowly based on the elasticity of the buffer cylinder portion 18. For this reason, it is possible to effectively prevent the occurrence of noise and vibration called rattling noise due to this collision.

又、上述した先発明の電動式パワーステアリング装置の作動時に、上記出力軸１０と上記ウォーム６とが軸方向にがたつく事は、上記弾性部材１７の軸予圧部２０が、これら出力軸１０とウォーム６とを、互いに離れる方向に弾性的に押圧する事により防止される。この為、上記がたつきに伴う騒音や振動の発生を有効に防止できる。
尚、上述した先発明の構造の場合には、上記緩衝筒部１８と上記軸予圧部２０とを、前記連結部１９を介して結合された一体の弾性部材１７として構成している為、これら緩衝筒部１８及び軸予圧部２０を、上記出力軸１０と上記ウォーム８との間に組み付け易い。即ち、上記弾性部材１７を組み付ける為のスペースが小さくて済むだけでなく、この弾性部材１７を組み付ける作業を容易に行える。 Further, when the electric power steering device of the above-described invention is operated, the output shaft 10 and the worm 6 rattle in the axial direction. The shaft preloading portion 20 of the elastic member 17 causes the output shaft 10 and the worm to move. 6 is elastically pressed in a direction away from each other. For this reason, generation | occurrence | production of the noise and vibration accompanying the said shakiness can be prevented effectively.
In the case of the structure of the prior invention described above, the buffer cylinder portion 18 and the shaft preload portion 20 are configured as an integral elastic member 17 coupled via the connecting portion 19. The buffer cylinder portion 18 and the shaft preload portion 20 can be easily assembled between the output shaft 10 and the worm 8. That is, not only the space for assembling the elastic member 17 is reduced, but also the operation of assembling the elastic member 17 can be performed easily.

ところが、上述した先発明の構造には、未だ改良の余地がある。即ち、上述した先発明の構造の場合には、前述の図７に示した従来構造の場合と同様、ウォームホイール４とウォーム歯５との間のバックラッシュを抑えるべく、コイルばね１４の弾力によって、ウォーム８の先端部を上記ウォームホイール４に向け揺動変位させる構成を採用している。この様にウォーム８の先端部をウォームホイール４に向け揺動変位させると、上記スプライン孔１１ａが上記スプライン軸部１２ａに対して傾斜する。ところが、上述した先発明の構造の場合には、上記スプライン孔１１ａの奥端面２４が円すい凹面になっており、この奥端面２４に上記軸予圧部２０の先端縁が、軸方向の変位だけでなく、径方向の変位も阻止された状態で係合している。この為、上述の様にスプライン孔１１ａがスプライン軸部１２ａに対して傾斜すると、これに伴って、上記軸予圧部２０が弾性的に曲げ変形し、この軸予圧部２０に弾性的な復元力が作用する。この復元力は、上記コイルばね１４の弾力に抗する力となる為、この復元力によって、このコイルばね１４の弾力の一部が相殺される。この結果、上記バックラッシュを抑える効果が低減すると言った不具合が生じる。又、上述の様に軸予圧部２０が弾性的に曲げ変形する事は、この軸予圧部２０の耐久性が低下する原因となる為、好ましくない。   However, the structure of the above-described prior invention still has room for improvement. That is, in the case of the structure of the prior invention described above, the elasticity of the coil spring 14 is used to suppress backlash between the worm wheel 4 and the worm tooth 5 as in the case of the conventional structure shown in FIG. Further, a configuration is adopted in which the tip of the worm 8 is oscillated and displaced toward the worm wheel 4. Thus, when the tip of the worm 8 is oscillated and displaced toward the worm wheel 4, the spline hole 11a is inclined with respect to the spline shaft portion 12a. However, in the case of the structure of the above-described prior invention, the back end surface 24 of the spline hole 11a is a conical concave surface, and the tip edge of the shaft preloading portion 20 is only displaced in the axial direction on the back end surface 24. And engaged in a state where radial displacement is also prevented. Therefore, when the spline hole 11a is inclined with respect to the spline shaft portion 12a as described above, the shaft preload portion 20 is elastically bent and deformed, and the shaft preload portion 20 is elastically restored. Works. Since this restoring force is a force that resists the elasticity of the coil spring 14, a part of the elasticity of the coil spring 14 is offset by the restoring force. As a result, there arises a problem that the effect of suppressing the backlash is reduced. In addition, it is not preferable that the shaft preload portion 20 is elastically bent and deformed as described above because the durability of the shaft preload portion 20 is reduced.

特開２００４−３０６８９８号公報JP 2004-306898 A

本発明の回転軸継手及びウォーム減速機付回転駆動装置は、上述の様な事情に鑑み、１対の回転軸同士が互いに傾斜する際に、これら両回転軸の端部に設けたスプライン孔の奥端面とスプライン軸部の先端面との間で軸予圧部材が弾性的に曲げ変形するのを防止できる構造を実現すべく発明したものである。   In view of the above-described circumstances, the rotary shaft joint and the rotary drive device with the worm reducer according to the present invention have a spline hole provided at the ends of both rotary shafts when the pair of rotary shafts are inclined to each other. The invention was invented to realize a structure capable of preventing the shaft preload member from being elastically bent and deformed between the back end surface and the tip surface of the spline shaft portion.

本発明の回転軸継手及びウォーム減速機付回転駆動装置のうち、請求項１に記載した回転軸継手は、１対の回転軸のうちの一方の回転軸の端部に、当該端部の端面に開口する状態で設けられた有底のスプライン孔と、上記両回転軸のうちの他方の回転軸の端部に設けられて、上記スプライン孔に対し、これら両回転軸同士の間でのトルク伝達を可能に、且つ、これら両回転軸同士の間に生じる若干の傾斜を許容可能にスプライン係合させたスプライン軸部と、上記スプライン孔の奥端面とこのスプライン軸部の先端面との間で軸方向に弾性的に圧縮した弾性材製の軸予圧部材とを備える。
特に、請求項１に記載した回転軸継手に於いては、上記スプライン孔の奥端面を部分球状凹面とすると共に、この奥端面と接触する上記軸予圧部材の表面を、上記部分球状凹面の曲率半径以下の曲率半径を有する部分球状凸面としている。 Of the rotary shaft joint and the rotary drive device with a worm reducer according to the present invention, the rotary shaft joint described in claim 1 is provided at the end of one of the pair of rotary shafts at the end surface of the end. A bottomed spline hole provided in an open state and the end of the other rotary shaft of the two rotary shafts, and torque between the rotary shafts with respect to the spline hole. Between the spline shaft portion that is spline-engaged to allow transmission and allow slight inclination between the two rotation shafts, and between the back end surface of the spline hole and the tip surface of the spline shaft portion And a shaft preload member made of an elastic material elastically compressed in the axial direction.
In particular, in the rotary shaft coupling according to claim 1, the back end surface of the spline hole is a partially spherical concave surface, and the surface of the shaft preload member in contact with the deep end surface is the curvature of the partial spherical concave surface. A partially spherical convex surface having a radius of curvature equal to or less than the radius is used.

上述の様な特徴を有する本発明の回転軸継手を実施する場合に、好ましくは、上記スプライン軸部の外周面と上記スプライン孔の内周面との間に、弾性材製で筒状の緩衝部材を挟持する。
この場合に、より好ましくは、上記軸予圧部材と上記緩衝部材とを、連結部を介して一体形成する。 When the rotary shaft coupling of the present invention having the above-described features is carried out, it is preferable that a cylindrical shock absorber made of an elastic material is provided between the outer peripheral surface of the spline shaft portion and the inner peripheral surface of the spline hole. Hold the member.
In this case, more preferably, the shaft preload member and the buffer member are integrally formed via a connecting portion.

又、上述の様な本発明の回転軸継手を実施する場合には、例えば請求項２に記載した発明の様に、上記軸予圧部材の形状を球状にする事ができる。
又、上述の様な本発明の回転軸継手を実施する場合に、好ましくは、請求項３に記載した発明の様に、上記軸予圧部材の表面と相手部材の表面（上記スプライン孔の奥端面や上記スプライン軸部の先端面等）との接触部に、グリース等の潤滑剤を介在させる。 When the rotary shaft coupling of the present invention as described above is implemented, the shape of the shaft preload member can be made spherical, for example, as in the invention described in claim 2.
When the rotary shaft joint of the present invention as described above is implemented, preferably, as in the invention described in claim 3, the surface of the shaft preload member and the surface of the mating member (the back end surface of the spline hole) And a lubricant such as grease is interposed in the contact portion with the tip surface of the spline shaft portion.

又、本発明のうち、請求項４に記載したウォーム減速機付回転駆動装置は、ハウジングと、このハウジング内に回転自在に支持された被駆動軸の外周面に、この被駆動軸と同心に支持されて、この被駆動軸と共に回転するウォームホイールと、このウォームホイールと噛合した状態で上記ハウジング内に回転自在に支持されたウォームと、このウォームの基端部にその駆動軸の先端部を、回転軸継手により結合した状態で、上記ハウジングに結合固定された回転駆動装置と、上記ウォームを上記ウォームホイールに向け押圧して、これらウォームとウォームホイールとの噛合部に予圧を付与する予圧付与手段とを備える。
特に、請求項４に記載したウォーム減速機付回転駆動装置に於いては、上記回転軸継手が、上述した本発明の回転軸継手である。 According to a fourth aspect of the present invention, there is provided a rotary drive device with a worm reduction gear on the outer surface of a housing and a driven shaft rotatably supported in the housing, concentrically with the driven shaft. A worm wheel supported and rotated together with the driven shaft, a worm rotatably supported in the housing in mesh with the worm wheel, and a distal end portion of the drive shaft at the base end portion of the worm. , A rotation drive device coupled and fixed to the housing in a state of being coupled by a rotary shaft joint, and applying a preload by pressing the worm toward the worm wheel and applying a preload to the meshing portion between the worm and the worm wheel Means.
In particular, in the rotary drive device with a worm speed reducer described in claim 4, the rotary shaft joint is the rotary shaft joint of the present invention described above.

又、上述した様な本発明のウォーム減速機付回転駆動装置は、例えば電動式パワーステアリング装置として使用する事ができる。この場合には、上記被駆動軸を、ステアリングホイールの操作により回転させられ、回転に伴って操舵輪に舵角を付与する回転軸とする。この様な回転軸としては、前述の図６に示したステアリングシャフト２の他、中間シャフト２１、ステアリングギヤユニット２２の入力軸（ピニオン軸）等が採用可能である。勿論、上記回転軸が何れであるかにより、上記ハウジングを支持する為の固定の部分は異なる。又、上記回転駆動装置を、電動モータとすると共に、上記駆動軸を、この電動モータの出力軸とする。   In addition, the rotary drive device with a worm speed reducer of the present invention as described above can be used as an electric power steering device, for example. In this case, the driven shaft is a rotating shaft that is rotated by an operation of the steering wheel and gives a steering angle to the steered wheels as it rotates. As such a rotating shaft, in addition to the steering shaft 2 shown in FIG. 6, the intermediate shaft 21, the input shaft (pinion shaft) of the steering gear unit 22, and the like can be employed. Of course, the fixed portion for supporting the housing differs depending on which of the rotating shafts. The rotary drive device is an electric motor, and the drive shaft is an output shaft of the electric motor.

上述の様に構成する本発明の回転軸継手及びウォーム減速機付回転駆動装置によれば、スプライン孔とスプライン軸部とが互いに傾斜する事に伴って、スプライン孔の奥端面に対する軸予圧部材の表面の接触位置を移動させる事ができる。そして、この接触位置の移動に基づいて、軸予圧部材が弾性的に曲げ変形する事を防止乃至は抑えられる。この為、軸予圧部材に上記傾斜を妨げる向きの弾性的な復元力が作用したり、或いは軸予圧部材の耐久性が低下したりする等の不具合が発生する事を防止乃至は抑えられる。   According to the rotary shaft coupling and the rotary drive device with the worm speed reducer of the present invention configured as described above, the shaft preload member with respect to the back end surface of the spline hole is inclined as the spline hole and the spline shaft portion are inclined to each other. The surface contact position can be moved. Based on the movement of the contact position, the shaft preload member can be prevented or suppressed from being elastically bent and deformed. For this reason, it is possible to prevent or suppress the occurrence of problems such as an elastic restoring force acting in the direction of preventing the inclination on the shaft preload member or a decrease in durability of the shaft preload member.

又、請求項２に記載した発明の場合には、スプライン孔とスプライン軸部とが互いに傾斜する事に伴って、スプライン孔の奥端面に対する軸予圧部材の表面の接触位置と、スプライン軸部の先端面に対する軸予圧部材の表面の接触位置とを、それぞれ移動させる事ができる。この為、これら各接触位置の移動に基づいて、軸予圧部材が弾性的に曲げ変形する事を、より有効に防止できる。
又、請求項３に記載した発明の場合には、潤滑剤の作用により、上記各接触位置の移動を、それぞれ円滑に行わせる事ができる。 Further, in the case of the invention described in claim 2, as the spline hole and the spline shaft portion are inclined with respect to each other, the contact position of the surface of the shaft preload member with respect to the back end surface of the spline hole and the spline shaft portion The contact position of the surface of the shaft preload member with respect to the tip surface can be moved. For this reason, it is possible to more effectively prevent the shaft preload member from being elastically bent and deformed based on the movement of each contact position.
Moreover, in the case of the invention described in claim 3, the movement of each contact position can be performed smoothly by the action of the lubricant.

［実施の形態の第１例］
図１〜４は、請求項１、３、４に対応する、本発明の実施の形態の第１例を示している。尚、本例の特徴は、使用状態で互いに接触する、スプライン孔１１ｂの奥端面２４ａと、弾性部材１７ａを構成する軸予圧部２０ａの先端面２５との、それぞれの形状を工夫した点にある。その他の部分の構造及び作用は、前述の図８〜９に示した先発明の構造とほぼ同様である。この為、同等部分には同一符号を付して、重複する図示並びに説明は省略若しくは簡略にし、以下、本例の特徴部分、並びに、上記先発明の構造と異なる部分を中心に説明する。 [First example of embodiment]
1 to 4 show a first example of an embodiment of the present invention corresponding to claims 1, 3 and 4. The feature of this example is that the shapes of the back end surface 24a of the spline hole 11b and the tip end surface 25 of the shaft preloading portion 20a constituting the elastic member 17a, which are in contact with each other in use, are devised. . The structure and operation of other parts are substantially the same as the structure of the previous invention shown in FIGS. For this reason, the same parts are denoted by the same reference numerals, and overlapping illustrations and descriptions are omitted or simplified. Hereinafter, the characteristic parts of this example and parts different from the structure of the above-described invention will be mainly described.

本例の場合には、上記スプライン孔１１ｂの奥端面２４ａを部分球状凹面とすると共に、上記軸予圧部２０ａの先端面２５を、上記奥端面２４ａと同じ曲率半径を有する部分球状凸面としている。そして、上記奥端面２４ａに上記先端面２５の全体を、潤滑剤であるグリースの膜を介して接触させている。又、これら奥端面２４ａと先端面２５との曲率中心は、図４の（Ｂ）に示す、上記スプライン孔１１ｂとスプライン軸部１２ａとの傾斜中心Ｏに一致させている。尚、本例の場合、上記軸予圧部２０ａの外周面は、先端側に向かう程径寸法が小さくなるテーパ面としている。又、この軸予圧部２０ａは、中心部まで弾性材が詰まった中実体としている。   In the case of this example, the back end surface 24a of the spline hole 11b is a partially spherical concave surface, and the tip surface 25 of the shaft preload portion 20a is a partially spherical convex surface having the same radius of curvature as the back end surface 24a. The entire end face 25 is brought into contact with the back end face 24a via a film of grease as a lubricant. Further, the centers of curvature of the back end face 24a and the tip end face 25 coincide with the inclination center O between the spline hole 11b and the spline shaft portion 12a shown in FIG. In the case of this example, the outer peripheral surface of the shaft preload portion 20a is a tapered surface whose diameter dimension decreases toward the tip side. The shaft preload portion 20a is a solid body filled with an elastic material up to the center.

上述の様に構成する本例の電動式パワーステアリング装置によれば、図４の（Ａ）→（Ｂ）の順に示す様に、スプライン軸部１２ａに対してスプライン孔１１ｂが傾斜する事に伴い、このスプライン孔１１ｂの奥端面２４ａに対する軸予圧部２０ａの先端面２５の接触位置（の中心点）を、滑らかに移動させる事ができる。そして、この接触位置（の中心点）の移動に基づいて、上記軸予圧部２０ａが弾性的に曲げ変形する事を防止乃至は抑えられる。この為、この軸予圧部２０ａに、上記傾斜を妨げる向きの弾性的な復元力｛コイルばね１４（図７参照）の弾力に抗する力｝が作用する事を防止乃至は抑えられる。従って、ウォームホイール４とウォーム８との間のバックラッシュを抑える効果が低減する事を防止乃至は抑えられる。又、上記弾性的な曲げ変形が生じる事によって、上記軸予圧部２０ａの耐久性が低下すると言った不具合が生じる事を防止できる。   According to the electric power steering device of the present example configured as described above, as shown in the order of (A) → (B) in FIG. 4, the spline hole 11b is inclined with respect to the spline shaft portion 12a. The contact position (the center point) of the tip surface 25 of the shaft preload portion 20a with respect to the back end surface 24a of the spline hole 11b can be moved smoothly. Based on the movement of the contact position (the center point thereof), the shaft preload portion 20a can be prevented or suppressed from being elastically bent and deformed. For this reason, it is possible to prevent or suppress the elastic restoring force {force against the elastic force of the coil spring 14 (see FIG. 7)} acting on the shaft preloading portion 20a from preventing the inclination. Therefore, the effect of suppressing the backlash between the worm wheel 4 and the worm 8 can be prevented or suppressed. Further, it is possible to prevent the occurrence of a problem that the durability of the shaft preload portion 20a is lowered due to the occurrence of the elastic bending deformation.

［実施の形態の第２例］
図５は、請求項１〜４に対応する、本発明の実施の形態の第２例を示している。本例の場合には、スプライン軸部１２ａの先端面２３とスプライン孔１１ｂの奥端面２４ａとの間に設置する、軸予圧部材２６を、緩衝筒部１８を含んで構成する弾性部材１７ｂとは、別個独立の部材としている。本例の場合、上記軸予圧部材２６は、上記弾性部材１７ｂと同じ弾性材により、全体を球状に構成している。この球状の軸予圧部材２６の半径（外周面の曲率半径）は、上記スプライン孔１１ｂの奥端面２４ａの曲率半径よりも小さい。又、上記弾性部材１７ｂは、上記緩衝筒部１８と、この緩衝筒部１８の先端開口を塞ぐ平板部２７とから成る。上記軸予圧部材２６は、この平板部２７の側面と上記スプライン孔１１ｂの奥端面２４ａとの間で、弾性的に圧縮挟持している。又、本例の場合も、互いに接触する、上記緩衝筒部１８の外周面と、上記平板部２７の側面及び上記奥端面２４ａとの間に、潤滑剤であるグリースを介在させている。 [Second Example of Embodiment]
FIG. 5 shows a second example of an embodiment of the present invention corresponding to claims 1 to 4. In the case of this example, what is the elastic member 17b that includes the buffer cylinder 18 and the shaft preload member 26 that is installed between the tip end surface 23 of the spline shaft portion 12a and the back end surface 24a of the spline hole 11b? It is a separate and independent member. In the case of this example, the shaft preload member 26 is formed in a spherical shape as a whole by the same elastic material as the elastic member 17b. The radius of the spherical shaft preload member 26 (the radius of curvature of the outer peripheral surface) is smaller than the radius of curvature of the back end surface 24a of the spline hole 11b. The elastic member 17b includes the buffer cylinder portion 18 and a flat plate portion 27 that closes the tip opening of the buffer cylinder portion 18. The shaft preload member 26 is elastically compressed and clamped between the side surface of the flat plate portion 27 and the back end surface 24a of the spline hole 11b. Also in the case of this example, grease, which is a lubricant, is interposed between the outer peripheral surface of the buffer cylinder portion 18 and the side surface of the flat plate portion 27 and the back end surface 24a that are in contact with each other.

上述の様に構成する本例の場合には、スプライン軸部１２ａに対してスプライン孔１１ｂが傾斜する事に伴い、このスプライン孔１１ｂの奥端面２４ａ及び弾性部材１７ｂの平板部２７の側面に対する、軸予圧部材２６の外周面の接触位置（の中心点）を、それぞれ滑らかに移動させる事ができる。そして、これら各接触位置（の中心点）の移動に基づいて、上記軸予圧部材２６が弾性的に曲げ変形する事を、有効に防止できる。その他の構成及び作用は、上述した第１例の場合と同様である。   In the case of this example configured as described above, as the spline hole 11b is inclined with respect to the spline shaft portion 12a, the back end surface 24a of the spline hole 11b and the side surface of the flat plate portion 27 of the elastic member 17b The contact position (the center point) of the outer peripheral surface of the shaft preload member 26 can be moved smoothly. Then, it is possible to effectively prevent the shaft preload member 26 from being elastically bent and deformed based on the movement of each contact position (the center point thereof). Other configurations and operations are the same as those of the first example described above.

本発明の実施の形態の第１例を示す、継手部の部分切断斜視図。The partial cutaway perspective view of a joint part showing the 1st example of an embodiment of the invention. 継手部の部分切断分解斜視図。The partial cutting exploded perspective view of a joint part. 弾性部材を示しており、（Ａ）は側面図、（Ｂ）は（Ａ）の右側から見た図。The elastic member is shown, (A) is a side view, (B) is the figure seen from the right side of (A). 継手部を示しており、（Ａ）は、連結した２部品の中心軸同士が一致した状態を、（Ｂ）は、同じく不一致の状態を、それぞれ示す部分切断側面図。The joint part is shown, (A) is the state in which the central axes of two connected components corresponded, (B) is a partially cutaway side view showing the same mismatched state. 本発明の実施の形態の第２例を示す、図１と同様の図。The figure similar to FIG. 1 which shows the 2nd example of embodiment of this invention. 従来構造の１例を示す、電動式パワーステアリング装置の全体構成の部分切断側面図。The partial cutaway side view of the whole structure of the electric power steering device which shows an example of the conventional structure. 図６の拡大X−X断面図。The expanded XX sectional drawing of FIG. 先発明の構造を示す、図７のY部に相当する拡大図。The enlarged view equivalent to the Y section of FIG. 7 which shows the structure of a prior invention. 弾性部材を示しており、（Ａ）は図８のZ矢印方向から見た斜視図、（Ｂ）は（Ａ）と同方向から見た半部切断斜視図、（Ｃ）は（Ａ）と逆方向から見た斜視図。The elastic member is shown, (A) is the perspective view seen from the Z arrow direction of FIG. 8, (B) is the half part cut perspective view seen from the same direction as (A), (C) is (A) and The perspective view seen from the reverse direction.

符号の説明Explanation of symbols

１ ステアリングホイール
２ ステアリングシャフト
３ ハウジング
４ ウォームホイール
５ ウォーム歯
６ ウォーム軸
７ 電動モータ
８ ウォーム
９ａ、９ｂ 転がり軸受
１０ 出力軸
１１、１１ａ、１１ｂ スプライン孔
１２、１２ａ スプライン軸部
１３ 押圧駒
１４ コイルばね
１５ 小径部
１６ 大径部
１７、１７ａ、１７ｂ 弾性部材
１８ 緩衝筒部
１９ 連結部
２０、２０ａ 軸予圧部
２１ 中間シャフト
２２ ステアリングギヤユニット
２３ 先端面
２４、２４ａ 奥端面
２５ 先端面
２６ 軸予圧部材
２７ 平板部 DESCRIPTION OF SYMBOLS 1 Steering wheel 2 Steering shaft 3 Housing 4 Worm wheel 5 Worm tooth 6 Worm shaft 7 Electric motor 8 Worm 9a, 9b Rolling bearing 10 Output shaft 11, 11a, 11b Spline hole 12, 12a Spline shaft part 13 Pressing piece 14 Coil spring 15 Small diameter portion 16 Large diameter portion 17, 17a, 17b Elastic member 18 Buffer cylinder portion 19 Connection portion 20, 20a Shaft preloading portion 21 Intermediate shaft 22 Steering gear unit 23 Front end surface 24, 24a Back end surface 25 Front end surface 26 Axial preloading member 27 Flat plate Part

Claims (4)

１対の回転軸のうちの一方の回転軸の端部に、当該端部の端面に開口する状態で設けられた有底のスプライン孔と、上記両回転軸のうちの他方の回転軸の端部に設けられて、このスプライン孔に対し、これら両回転軸同士の間でのトルク伝達を可能に、且つ、これら両回転軸同士の間に生じる傾斜を許容可能にスプライン係合させたスプライン軸部と、上記スプライン孔の奥端面とこのスプライン軸部の先端面との間で軸方向に弾性的に圧縮した弾性材製の軸予圧部材とを備えた回転軸継手に於いて、上記スプライン孔の奥端面を部分球状凹面とすると共に、この奥端面と接触する上記軸予圧部材の表面を、上記部分球状凹面の曲率半径以下の曲率半径を有する部分球状凸面とした事を特徴とする回転軸継手。   A bottomed spline hole provided at the end of one of the pair of rotating shafts so as to open to the end surface of the end, and the end of the other rotating shaft of the two rotating shafts The spline shaft is provided in the spline hole so that torque can be transmitted between the two rotation shafts and the inclination generated between the two rotation shafts is allowed to be splined to the spline hole. A rotary shaft coupling comprising a spline hole and a shaft preloading member made of an elastic material elastically compressed in the axial direction between the back end surface of the spline hole and the tip end surface of the spline shaft portion. A rotary shaft characterized in that the back end surface of the shaft is a partially spherical concave surface, and the surface of the shaft preload member that contacts the back end surface is a partially spherical convex surface having a radius of curvature equal to or less than the radius of curvature of the partial spherical concave surface. Fittings. 軸予圧部材の形状が球状である、請求項１に記載した回転軸継手。   The rotary shaft coupling according to claim 1, wherein the shape of the shaft preload member is spherical. 軸予圧部材の表面と相手部材の表面との接触部に潤滑剤を介在させている、請求項１〜２のうちの何れか１項に記載した回転軸継手。   The rotary shaft coupling according to any one of claims 1 to 2, wherein a lubricant is interposed in a contact portion between the surface of the shaft preload member and the surface of the counterpart member. ハウジングと、このハウジング内に回転自在に支持された被駆動軸の外周面にこの被駆動軸と同心に支持されて、この被駆動軸と共に回転するウォームホイールと、このウォームホイールと噛合した状態で上記ハウジング内に回転自在に支持されたウォームと、このウォームの基端部にその駆動軸の先端部を回転軸継手により結合した状態で上記ハウジングに結合固定された回転駆動装置と、上記ウォームを上記ウォームホイールに向け押圧してこれらウォームとウォームホイールとの噛合部に予圧を付与する予圧付与手段とを備えたウォーム減速機付回転駆動装置に於いて、上記回転軸継手が、請求項１〜３のうちの何れか１項に記載した回転軸継手である事を特徴とするウォーム減速機付回転駆動装置。   A housing, a worm wheel that is supported concentrically with the driven shaft on the outer peripheral surface of a driven shaft that is rotatably supported in the housing, and rotates with the driven shaft, and is engaged with the worm wheel. A worm rotatably supported in the housing, a rotary drive device coupled and fixed to the housing in a state in which a distal end portion of the drive shaft is coupled to a base end portion of the worm by a rotary shaft joint, and the worm In a rotary drive device with a worm speed reducer provided with a preload applying means for applying a preload to a meshing portion between the worm and the worm wheel by pressing toward the worm wheel, the rotary shaft coupling includes: A rotary drive device with a worm speed reducer, wherein the rotary shaft coupling is any one of the three.
JP2008161292A 2008-06-20 2008-06-20 Rotation drive unit with worm reducer Expired - Fee Related JP5217676B2 (en)

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2012106580A (en) * 2010-11-17 2012-06-07 Nsk Ltd Electric power steering device
JP2012131249A (en) * 2010-12-20 2012-07-12 Nsk Ltd Electric power steering device
WO2012173096A1 (en) * 2011-06-16 2012-12-20 日本精工株式会社 Electric power steering apparatus
JP2013169918A (en) * 2012-02-22 2013-09-02 Suzuki Motor Corp Electric power steering device
KR20140120074A (en) * 2013-04-02 2014-10-13 주식회사 만도 Electric power steering apparatus for vehicle and method of assembling the same
CN115163788A (en) * 2022-06-22 2022-10-11 一汽奔腾轿车有限公司 Highly-integrated three-bearing electric drive drum-shaped positioning structure

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JP2006151352A (en) * 2004-10-25 2006-06-15 Nsk Ltd Steering device
JP2008002671A (en) * 2006-06-26 2008-01-10 Ricoh Co Ltd Rotary drive force coupling device and image forming device

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JPS5139148U (en) * 1974-09-19 1976-03-24
JP2006151352A (en) * 2004-10-25 2006-06-15 Nsk Ltd Steering device
JP2008002671A (en) * 2006-06-26 2008-01-10 Ricoh Co Ltd Rotary drive force coupling device and image forming device

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2012106580A (en) * 2010-11-17 2012-06-07 Nsk Ltd Electric power steering device
JP2012131249A (en) * 2010-12-20 2012-07-12 Nsk Ltd Electric power steering device
WO2012173096A1 (en) * 2011-06-16 2012-12-20 日本精工株式会社 Electric power steering apparatus
CN103043093A (en) * 2011-06-16 2013-04-17 日本精工株式会社 Electric power steering apparatus
JPWO2012173096A1 (en) * 2011-06-16 2015-02-23 日本精工株式会社 Electric power steering device
US9102351B2 (en) 2011-06-16 2015-08-11 Nsk Ltd. Electronic power-steering apparatus
JP2013169918A (en) * 2012-02-22 2013-09-02 Suzuki Motor Corp Electric power steering device
KR20140120074A (en) * 2013-04-02 2014-10-13 주식회사 만도 Electric power steering apparatus for vehicle and method of assembling the same
KR101686206B1 (en) * 2013-04-02 2016-12-13 주식회사 만도 Electric power steering apparatus for vehicle and method of assembling the same
CN115163788A (en) * 2022-06-22 2022-10-11 一汽奔腾轿车有限公司 Highly-integrated three-bearing electric drive drum-shaped positioning structure

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