JP2011089548A - Shaft coupling mechanism - Google Patents

Shaft coupling mechanism Download PDF

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JP2011089548A
JP2011089548A JP2009241907A JP2009241907A JP2011089548A JP 2011089548 A JP2011089548 A JP 2011089548A JP 2009241907 A JP2009241907 A JP 2009241907A JP 2009241907 A JP2009241907 A JP 2009241907A JP 2011089548 A JP2011089548 A JP 2011089548A
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base
protrusions
pair
rotation
shaft
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JP5407741B2 (en
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Noboru Nakagawa
昇 中川
Daisuke Yoshimoto
大介 吉本
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Oiles Corp
Oiles Industry Co Ltd
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Oiles Corp
Oiles Industry Co 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
    • F16D3/64—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 comprising elastic elements arranged between substantially-radial walls of both coupling parts
    • F16D3/68—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 comprising elastic elements arranged between substantially-radial walls of both coupling parts the elements being made of rubber or similar material

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

Abstract

<P>PROBLEM TO BE SOLVED: To provide a shaft coupling mechanism capable of eliminating collision noise in a relative displacement in the axial direction of one rotary shaft to the other rotary shaft, preventing any disagreeable friction noise in the transmission of the rotation of one rotary shaft to the other rotary shaft, ensuring the contact area of a projecting part of each coupling base body to each rotation transmitting member in the direction around the axis as desired, and preventing any degradation of the durability. <P>SOLUTION: The shaft coupling mechanism 1 for an electric power steering device includes a coupling base body 3 connected to a rotary shaft 2, a coupling base body 5 coupled with a steering shaft 4, a pair of rotation transmitting members 6 and 7 which are arranged between the rotary shaft 2 and the steering shaft 4 via both coupling base bodies 3 and 5 to transmit the rotation in the R direction of the rotary shaft 2 to the steering shaft 4, an intermediate interposition member 8 arranged between the pair of rotation transmitting members 6 and 7, and a coupling means 9 for coupling the pair of rotation transmitting members 6 and 7 with each other. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

本発明は、電動式パワーステアリング装置における電動モータ等の回転源側の回転軸と自動車のステアリング軸等の作動側の回転軸とを連結するに適した軸連結機構に関する。   The present invention relates to a shaft coupling mechanism suitable for coupling a rotation shaft on a rotation source side such as an electric motor in an electric power steering device and a rotation shaft on an operation side such as a steering shaft of an automobile.

例えば、電動式パワーステアリング装置は、手動操作されるステアリングホイール（ハンドル）の回転に基づく回転力に電動モータの出力回転軸の回転に基づく回転力を付加してステアリングホイールの手動による操舵を容易に行い得るようにするものであって、斯かる電動式パワーステアリング装置においては、ステアリングホイール側のステアリング軸と電動モータの出力回転軸側の回転軸とを軸連結機構（カップリング）を介して連結している。   For example, an electric power steering apparatus easily adds a rotational force based on rotation of an output rotation shaft of an electric motor to a rotational force based on rotation of a manually operated steering wheel (handle) to facilitate manual steering of the steering wheel. In such an electric power steering apparatus, the steering shaft on the steering wheel side and the rotating shaft on the output rotating shaft side of the electric motor are connected via a shaft connecting mechanism (coupling). is doing.

軸連結機構を介してステアリング軸と回転軸とを連結する場合、電動モータの出力回転軸の反転時の衝撃、電動モータのブラシ振動が軸連結機構及びステアリング軸を介してステアリングホイールに伝達されて運転者に不快な操舵感を生じさせる虞があり、これを回避するために軸連結機構にゴム又は軟質樹脂等のスペーサを設けることが提案されているが、衝撃、振動の低減を重視してスペーサをより柔軟なものにすると、柔軟なスペーサはクリープ変形が生じ易いために、スペーサへの繰り返し荷重によるスペーサの永久的な変形で軸連結機構にガタが生じてこれによってもまた運転者の操舵感覚が不快なものとなる虞がある一方、耐久性を重視してスペーサを硬質なものにすると、前記と逆にガタのない点で操舵感覚は良くなるが、上述の通りステアリングホイールに伝達された衝撃、振動で操舵感覚が不快なものとなる。   When the steering shaft and the rotating shaft are connected via the shaft connecting mechanism, the impact when the output rotating shaft of the electric motor is reversed and the brush vibration of the electric motor are transmitted to the steering wheel via the shaft connecting mechanism and the steering shaft. There is a possibility of causing an unpleasant steering feeling to the driver, and in order to avoid this, it has been proposed to provide spacers such as rubber or soft resin in the shaft coupling mechanism, but importance is placed on reducing impact and vibration. If the spacer is made more flexible, the flexible spacer is likely to be creep-deformed, so that the permanent deformation of the spacer due to repeated load on the spacer causes backlash in the shaft coupling mechanism, which also causes the driver to steer. On the other hand, if the spacer is hard with emphasis on durability, the steering sensation will be improved in terms of the absence of backlash. As the impact that is transmitted to the steering wheel, the steering sense vibration becomes uncomfortable for.

そこで、一対の回転伝達部材とこの一対の回転伝達部材間に配されている弾性変形可能な中間介在部材と一方の回転軸に連結される一方の連結基体と他方の回転軸に連結される他方の連結基体とを具備して、長期の使用によっても一方の回転軸である例えば電動モータの出力回転軸に連結された回転軸と他方の回転軸である例えばステアリングホイールに連結されたステアリング軸との間に軸心周りの方向についてのガタが生じ難く、しかも、電動モータの反転時の衝撃、ブラシ振動のステアリングホイールへの伝達を低減でき、而して、耐久性に優れ操舵感覚を不快にさせない電動式パワーステアリング装置用の軸連結機構も提案されている（特許文献４参照）。   Therefore, a pair of rotation transmitting members, an elastically deformable intermediate interposed member disposed between the pair of rotation transmitting members, one connecting base connected to one rotating shaft, and the other connected to the other rotating shaft And a rotating shaft connected to an output rotating shaft of an electric motor, for example, and a rotating shaft connected to a steering wheel, for example. In addition, the backlash in the direction around the shaft center is unlikely to occur, and the impact during reversal of the electric motor and the transmission of brush vibrations to the steering wheel can be reduced. There has also been proposed a shaft coupling mechanism for an electric power steering device that is not allowed (see Patent Document 4).

特表２００２−５１８２４２号公報Special table 2002-518242 gazette 特開２００４−１４８９９０号公報JP 2004-148990 A 特開２００４−１４９０７０号公報JP 2004-149070 A 特開２００６−１８３６７６号公報JP 2006-183676 A

ところで、斯かる提案の軸連結機構では、連結基体の夫々は、基部とこの基部の軸方向の一方の面から軸方向に一体的に突出した突部とを具備している結果、中間介在部材に軸方向の弾性圧縮変形を生じさせる一方の回転軸の他方の回転軸に対する軸方向の相対的な変位において、各連結基体の突部が相手側の連結基体の基部に押圧、接触して、この押圧、接触による衝突音が生じ、更には、一方の回転軸の回転の他方の回転軸への伝達において斯かる軸方向の相対的な変位が生じると、押圧、接触に起因する不快な摩擦音が生じる虞がある。   By the way, in such a proposed shaft coupling mechanism, each of the coupling bases is provided with a base portion and a protrusion integrally protruding in the axial direction from one axial surface of the base portion. In the relative displacement in the axial direction with respect to the other rotating shaft of one rotating shaft that causes elastic compression deformation in the axial direction, the protrusion of each connecting base presses and contacts the base of the mating connecting base, When this impingement noise occurs due to pressing and contact, and when the relative displacement in the axial direction occurs in the transmission of rotation of one rotating shaft to the other rotating shaft, unpleasant frictional sound caused by pressing and contacting occurs. May occur.

斯かる押圧、接触を避けるべく、各連結基体の突部の軸方向の長さを短くすると、各連結基体の突部の各回転伝達部材への軸心周りの方向における接触面積が小さくなり、各回転伝達部材が異常に変形されたりして耐久性が劣化する虞がある。   In order to avoid such pressing and contact, when the axial length of the protrusion of each connection base is shortened, the contact area in the direction around the axis of each rotation transmission member of the protrusion of each connection base is reduced, Each rotation transmission member may be deformed abnormally and durability may deteriorate.

本発明は、前記諸点に鑑みてなされたものであって、その目的とするところは、一方の回転軸の他方の回転軸に対する軸方向の相対的な変位において衝突音の発生をなくし得ると共に一方の回転軸の回転の他方の回転軸への伝達においては不快な摩擦音を生じさせることなく、しかも、各連結基体の突部の各回転伝達部材への軸心周りの方向における接触面積を所望に確保できて、耐久性の劣化のない軸連結機構を提供することにある。   The present invention has been made in view of the above-described points, and an object of the present invention is to eliminate the occurrence of collision noise in the relative displacement in the axial direction of one rotary shaft with respect to the other rotary shaft. In the transmission of the rotation of the rotation shaft to the other rotation shaft, an unpleasant frictional sound is not generated, and the contact area in the direction around the shaft center of the projection of each connection base to each rotation transmission member is desired. An object of the present invention is to provide a shaft coupling mechanism that can be secured and has no deterioration in durability.

本発明による軸連結機構は、一方の回転軸の回転を他方の回転軸に伝達するように二つの回転軸の間に配されて二つの回転軸を連結する軸連結機構であって、一対の回転伝達部材と、この一対の回転伝達部材間に配されている中間介在部材と、一方の回転軸に連結される一方の連結基体と、他方の回転軸に連結される他方の連結基体とを具備しており、一対の回転伝達部材の夫々は、基部と、軸心周りの方向において互いに離間していると共に対応の基部の外周縁から径方向に伸びて当該基部に一体的に設けられた少なくとも一対の突部と、基部の一方の軸方向の面に一体的に形成された突出部とを有しており、中間介在部材は、軸方向において一対の回転伝達部材の一対の突部間に配されていると共に各対の突部における軸心周りの方向の幅よりも大きな幅をもった一対の突部を有しており、中間介在部材の一対の突部は、一対の回転伝達部材の夫々の一対の突部の剛性よりも小さな剛性を有すると共に弾性変形可能であり、一方及び他方の連結基体は、基部と、この基部の軸方向の一方の面から軸方向に一体的に突出した突部とを夫々具備しており、一方の連結基体の基部は、その軸方向の一方の面で一方の回転伝達部材の一方の軸方向の面に一体的に形成された突出部に接触しており、他方の連結基体の基部は、その軸方向の一方の面で他方の回転伝達部材の一方の軸方向の面に一体的に形成された突出部に接触しており、一方の連結基体の突部は、軸心周りの方向における一対の回転伝達部材の各対の突部間のうちの一方の突部間及び軸心周りの方向における中間介在部材の一対の突部間のうちの一方の突部間に配されていると共に他方の回転伝達部材の一方の軸方向の面を越えて軸方向の先端面で他方の連結基体の基部の軸方向の一方の面に隙間をもって対面しており、他方の連結基体の突部は、軸心周りの方向における一対の回転伝達部材の一対の突部間のうちの他方の突部間及び軸心周りの方向における中間介在部材の一対の突部間のうちの他方の突部間に配されていると共に一方の回転伝達部材の一方の軸方向の面を越えて軸方向の先端面で一方の連結基体の基部の軸方向の一方の面に隙間をもって対面している。   A shaft coupling mechanism according to the present invention is a shaft coupling mechanism that is arranged between two rotation shafts so as to transmit the rotation of one rotation shaft to the other rotation shaft and connects the two rotation shafts. A rotation transmission member, an intermediate interposed member disposed between the pair of rotation transmission members, one connection base connected to one rotation shaft, and the other connection base connected to the other rotation shaft. Each of the pair of rotation transmitting members is separated from each other in the direction around the base and the base and extends from the outer peripheral edge of the corresponding base in the radial direction, and is provided integrally with the base. At least a pair of protrusions and a protrusion integrally formed on one axial surface of the base, and the intermediate interposed member is between the pair of protrusions of the pair of rotation transmitting members in the axial direction. In the direction around the axis of each pair of protrusions. A pair of protrusions having a larger width, and the pair of protrusions of the intermediate interposed member has a rigidity smaller than the rigidity of each of the pair of protrusions of the pair of rotation transmission members and elastically deforms. The one and the other connecting bases each have a base and a protrusion integrally protruding in the axial direction from one axial surface of the base, and the base of the one connecting base is , One axial surface thereof is in contact with a projecting portion formed integrally with one axial transmission surface of one rotation transmission member, and the base of the other connecting base is one of the axial transmission surfaces. The protrusion is integrally formed on one axial surface of the other rotation transmission member at the surface, and the protrusion of one connection base is formed by the pair of rotation transmission members in the direction around the axis. Intermediate interposition member between one protrusion of each pair of protrusions and in the direction around the axis It is arranged between one protrusion of the pair of protrusions and exceeds the axial surface of one of the other rotation transmission members in the axial direction at the tip end surface in the axial direction. One surface faces with a gap, and the projecting portion of the other connecting base is between the other projecting portion of the pair of rotation transmitting members in the direction around the shaft center and around the shaft center. One of the connecting bases is disposed between the other protrusions of the pair of protrusions of the intermediate interposition member in the direction and beyond the one axial surface of the one rotation transmission member at the axial front end surface. It faces one side of the base of the axial direction with a gap.

本発明による軸連結機構によれば、一対の回転伝達部材の夫々がその基部の一方の軸方向の面に一体的に形成された突出部を具備しており、一方の連結基体の基部がその軸方向の一方の面で一方の回転伝達部材の一方の軸方向の面に一体的に形成された突出部に接触しており、他方の連結基体の基部がその軸方向の一方の面で他方の回転伝達部材の一方の軸方向の面に一体的に形成された突出部に接触しており、軸心周りの方向における一対の回転伝達部材の各対の突部間のうちの一方の突部間及び軸心周りの方向における中間介在部材の一対の突部間のうちの一方の突部間に配されている一方の連結基体の突部が他方の回転伝達部材の一方の軸方向の面を越えて軸方向の先端面で他方の連結基体の基部の軸方向の一方の面に隙間をもって対面しており、軸心周りの方向における一対の回転伝達部材の一対の突部間のうちの他方の突部間及び軸心周りの方向における中間介在部材の一対の突部間のうちの他方の突部間に配されている他方の連結基体の突部が一方の回転伝達部材の一方の軸方向の面を越えて軸方向の先端面で一方の連結基体の基部の軸方向の一方の面に隙間をもって対面しているために、一方の連結基体の突部の先端面と他方の連結基体の基部の軸方向の一方の面との接触及び他方の連結基体の突部の先端面と一方の連結基体の基部の軸方向の一方の面との接触を避けることができ、しかも、一方及び他方の連結基体の突部を一対の回転伝達部材の一対の突部の全面に軸心周りの方向において接触させることができ、而して、一方の回転軸の他方の回転軸に対する軸方向の相対的な変位において衝突音の発生をなくし得ると共に一方の回転軸の回転の他方の回転軸への伝達においては不快な摩擦音を生じさせることなく、しかも、各連結基体の突部の各回転伝達部材への軸心周りの方向における接触面積を所望に確保できて、耐久性を向上できる。   According to the shaft coupling mechanism of the present invention, each of the pair of rotation transmitting members has a protrusion formed integrally on one axial surface of the base, and the base of one coupling base is the One axial surface is in contact with a protrusion formed integrally with one axial surface of one rotation transmission member, and the base of the other connecting base is the other axial surface with the other One of the protrusions between the pair of protrusions of the pair of rotation transmission members in the direction around the axis is in contact with the protrusion formed integrally on one axial surface of the rotation transmission member of The protrusion of one connection base disposed between one protrusion of the pair of protrusions of the intermediate interposed member in the direction between the parts and around the axis is in the one axial direction of the other rotation transmission member. Beyond the surface, the front end surface in the axial direction is opposed to one surface in the axial direction of the base of the other connecting base with a gap. The other of the pair of projections of the pair of rotation transmitting members in the direction around the axis and the other of the pair of projections of the intermediate interposed member in the direction around the axis. The protrusion of the other connecting base disposed between the protrusions exceeds the one axial face of the one rotation transmitting member, and the one axial face of the base of the one connecting base at the front end face in the axial direction. Since the front surfaces of the protrusions of one of the connection bases are in contact with each other in the axial direction of the base of the other connection base and the front surfaces of the protrusions of the other connection base Contact with one surface in the axial direction of the base portion of the connection base, and the protrusions of the one and the other connection bases are arranged on the entire surface of the pair of protrusions of the pair of rotation transmitting members around the axis. Can be brought into contact in the direction and thus the axis of one axis of rotation with respect to the other axis of rotation In the relative displacement of the direction, it is possible to eliminate the occurrence of collision noise, and transmission of the rotation of one rotary shaft to the other rotary shaft does not cause an unpleasant frictional sound, and each of the protrusions of each connection base The contact area in the direction around the axis to the rotation transmitting member can be ensured as desired, and the durability can be improved.

好ましい例では、一対の回転伝達部材の夫々の突出部は、軸心周りの方向において互いに離間されていると共に平坦であって互いに面一な軸方向の端面を有している複数個の円弧状の突起を具備しているが、本発明は、斯かる突出部の例に限定されず、平坦な軸方向の環状の端面を有している連続した環状の突起を具備していてもよい。   In a preferred example, each of the protrusions of the pair of rotation transmitting members has a plurality of arcuate shapes that are spaced apart from each other in the direction around the axis and are flat and have axial end faces that are flush with each other. However, the present invention is not limited to such an example of the protruding portion, and may include a continuous annular protrusion having a flat axial end face.

本発明において、一対の回転伝達部材は、好ましくは、ポリアセタール樹脂、ポリアミド樹脂等の硬質の樹脂から形成されるが、その他の剛性を呈する硬質の樹脂から形成されていてもよく、中間介在部材は、ウレタンゴム、ポリエステルエラストマー等のゴム弾性体から形成されているとよい。   In the present invention, the pair of rotation transmission members are preferably formed of a hard resin such as polyacetal resin or polyamide resin, but may be formed of a hard resin exhibiting other rigidity. It is good to be formed from rubber elastic bodies, such as urethane rubber and polyester elastomer.

本発明の好ましい例の軸連結機構は、一対の回転伝達部材を相互に結合する結合手段を更に有しており、斯かる例の軸連結機構では、一対の回転伝達部材の夫々の基部は環状であり、結合手段は、一方の回転伝達部材の基部の他方の軸方向の面の内周縁から他方の回転伝達部材の基部に向かって伸びて一方の回転伝達部材の基部に一体的に設けられていると共に先端で他方の回転伝達部材の基部の内周縁に引っ掛けられたつめ部と、他方の回転伝達部材の基部の他方の軸方向の面の内周縁から一方の回転伝達部材の基部に向かって伸びて他方の回転伝達部材の基部に一体的に設けられていると共に先端で一方の回転伝達部材の基部の内周縁に引っ掛けられたつめ部とを具備しているとよく、中間介在部材は、環状の基部と、この基部の内周縁から径方向に伸びて当該基部に一体的に設けられた係止突起とを具備しており、中間介在部材の一対の突部は、当該中間介在部材の基部の外周縁から径方向に伸びて当該中間介在部材の基部に一体的に設けられており、係止突起は、結合手段の両つめ部で区画される空所に嵌合されているとよい。   The shaft coupling mechanism of the preferred example of the present invention further includes coupling means for coupling the pair of rotation transmission members to each other. In the shaft coupling mechanism of such an example, each base portion of the pair of rotation transmission members is annular. The coupling means extends integrally from the inner peripheral edge of the other axial surface of the base of one rotation transmission member toward the base of the other rotation transmission member, and is integrally provided at the base of one rotation transmission member. And a claw portion that is hooked at the tip of the inner periphery of the base of the other rotation transmission member and the inner periphery of the other axial surface of the base of the other rotation transmission member toward the base of the one rotation transmission member. And is provided integrally with the base of the other rotation transmission member and has a claw portion hooked to the inner peripheral edge of the base of one rotation transmission member at the tip. An annular base and the inner periphery of this base And a pair of protrusions of the intermediate interposed member extending in the radial direction from the outer peripheral edge of the base of the intermediate interposed member. It is preferable to be provided integrally with the base portion of the intermediate interposed member, and the locking protrusion is fitted in a space defined by both the claw portions of the coupling means.

斯かる係止突起により中間介在部材が結合手段の両つめ部で区画される空所を介して一対の回転伝達部材に対して位置決めされていると、二つの回転軸の相対的な両方向の回転に対して中間介在部材による効果を均等に得ることができる。   When the intermediate projection member is positioned with respect to the pair of rotation transmission members via the space defined by the two claws of the coupling means by such a locking projection, the relative rotation of the two rotation shafts in both directions is achieved. In contrast, the effect of the intermediate interposed member can be obtained uniformly.

好ましい例では、軸方向において中間介在部材の突部に対面する回転伝達部材の突部の夫々は、軸心周りの方向のその中央部では、対面する中間介在部材の突部と接触する一方、軸心周りの方向のその縁部では、対面する中間介在部材の突部との間で空所を形成するように、軸心周りの方向において中高になっており、斯かる空所が形成されていると、弾性変形での中間介在部材の一対の突部における軸心周りの方向の縁部の膨らみを空所で吸収できる結果、一対の回転伝達部材の軸方向において互いに対面する突部の相互離反を避けることができ、而して、安定した回転力の伝達を行い得る。   In a preferred example, each of the protrusions of the rotation transmitting member facing the protrusions of the intermediate interposed member in the axial direction is in contact with the protrusions of the intermediate interposed member facing each other at the center in the direction around the axis, At the edge portion in the direction around the axis, the space is formed in the direction around the axis so as to form a void with the protruding portion of the facing intermediate interposed member, and such a void is formed. As a result, the bulges of the edges in the direction around the axis of the pair of protrusions of the intermediate interposed member due to elastic deformation can be absorbed in the voids, so that the protrusions facing each other in the axial direction of the pair of rotation transmitting members Mutual separation can be avoided, and thus stable rotational force can be transmitted.

本発明による軸連結機構では、一方の回転軸の他方の回転軸に対する相対的な初期回転で遊びが生じないようにするために、一方及び他方の連結基体の突部は、軸心周りの方向のその各側面で、両回転軸の一定以下の相対回転では軸心周りの方向において対面する中間介在部材の突部の軸心周りの方向の側面に接触している一方、軸心周りの方向において対面する一対の回転伝達部材の突部の軸心周りの方向の側面に、両回転軸の一定以下の相対回転では非接触となり、両回転軸の一定以上の相対回転では接触するようになっているとよい。一方の連結基体は、一方の回転軸に直接的に連結されて固着されていてもよいが、歯車機構等の他の回転伝達機構を介して一方の回転軸に間接的に連結されていてもよく、他方の連結基体も同様である。   In the shaft coupling mechanism according to the present invention, the protrusions of the one and the other coupling bases are arranged in directions around the axis so that play does not occur in the initial rotation relative to the other rotation shaft of the one rotation shaft. In each of the side surfaces of the intermediate contact member, in the relative rotation of both rotation axes below a certain level, the side surface in the direction around the axis of the protrusion of the intermediate interposed member facing in the direction around the axis is in contact with the direction around the axis. In the direction around the axial center of the protrusions of the pair of rotation transmitting members facing each other in the case of non-contact relative rotation of both rotation shafts below a certain level, and contact in the case of relative rotation of both rotation shafts above a certain level. It is good to have. One connecting base may be directly connected and fixed to one rotating shaft, but may be indirectly connected to one rotating shaft via another rotation transmission mechanism such as a gear mechanism. The other connecting base is the same.

本発明の軸連結機構は、電動式パワーステアリング装置用のものであってもよく、この場合、一方の回転軸は、電動モータの出力回転軸に連結されるようになっており、他方の回転軸は、自動車のステアリング軸に連結されるようになっていてもよい。   The shaft coupling mechanism of the present invention may be for an electric power steering apparatus. In this case, one rotating shaft is coupled to the output rotating shaft of the electric motor, and the other rotating shaft. The shaft may be connected to the steering shaft of the automobile.

本発明によれば、一方の回転軸の他方の回転軸に対する軸方向の相対的な変位において衝突音の発生をなくし得ると共に一方の回転軸の回転の他方の回転軸への伝達においては不快な摩擦音を生じさせることなく、しかも、各連結基体の突部の各回転伝達部材への軸心周りの方向における接触面積を所望に確保できて、耐久性の劣化のない軸連結機構を提供することができる。   According to the present invention, it is possible to eliminate the occurrence of a collision sound in the axial relative displacement of one rotary shaft with respect to the other rotary shaft and uncomfortable in transmitting the rotation of one rotary shaft to the other rotary shaft. To provide a shaft coupling mechanism that can ensure a desired contact area in the direction around the shaft center of each projection of each coupling base to each rotation transmission member without causing frictional noise, and that does not deteriorate durability. Can do.

図１は、本発明の実施の形態の好ましい例の正面図である。FIG. 1 is a front view of a preferred example of an embodiment of the present invention. 図２は、図１に示す例の一部破断正面図である。FIG. 2 is a partially broken front view of the example shown in FIG. 図３は、図１に示す例のＩＩＩ−ＩＩＩ線矢視断面図である。3 is a cross-sectional view taken along the line III-III of the example shown in FIG. 図４は、図１に示す例のＩＶ−ＩＶ線矢視断面図である。4 is a cross-sectional view taken along line IV-IV in the example shown in FIG. 図５は、図１に示す例のＶ−Ｖ線矢視断面図である。FIG. 5 is a cross-sectional view of the example shown in FIG. 図６は、図１に示す例の回転軸側の連結基体の右側面図である。FIG. 6 is a right side view of the connecting base on the rotating shaft side in the example shown in FIG. 図７は、図１に示す例のステアリング軸側の連結基体の左側面図である。FIG. 7 is a left side view of the coupling base on the steering shaft side in the example shown in FIG. 図８は、図１に示す例の中間介在部材の説明図であって、（ａ）は左側面図であり、（ｂ）は（ａ）のｂ−ｂ線矢視断面図である。8A and 8B are explanatory views of the intermediate intermediate member of the example shown in FIG. 1, wherein FIG. 8A is a left side view, and FIG. 8B is a cross-sectional view taken along line bb in FIG. 図９は、図１に示す例の回転軸側の回転伝達部材の説明図であって、（ａ）は左側面であり、（ｂ）は（ａ）のｂ−ｂ線矢視断面図であり、（ｃ）は右側面である。9 is an explanatory diagram of the rotation transmission member on the rotating shaft side of the example shown in FIG. 1, wherein (a) is a left side surface, and (b) is a cross-sectional view taken along the line bb of (a). Yes, (c) is the right side. 図１０は、図１に示す例のステアリング軸側の回転伝達部材の説明図であって、（ａ）は左側面図であり、（ｂ）は（ａ）のｂ−ｂ線矢視断面図であり、（ｃ）は右側面図である。10A and 10B are explanatory views of the rotation transmission member on the steering shaft side in the example shown in FIG. 1, wherein FIG. 10A is a left side view, and FIG. 10B is a cross-sectional view taken along line bb in FIG. (C) is a right side view.

次に本発明の実施の形態を、図に示す好ましい例に基づいて更に詳細に説明する。なお、本発明はこれら例に何等限定されないのである。   Next, embodiments of the present invention will be described in more detail based on preferred examples shown in the drawings. The present invention is not limited to these examples.

図１から図５において、本例の電動式パワーステアリング装置用の軸連結機構１は、回転軸２に連結された連結基体３と、回転軸としてのステアリング軸４に連結された連結基体５と、両連結基体３及び５を介して回転軸２とステアリング軸４との間に配されていると共に回転軸２のＲ方向の回転をステアリング軸４に伝達する一対の回転伝達部材６及び７と、一対の回転伝達部材６及び７間に配されている中間介在部材８と、一対の回転伝達部材６及び７を相互に結合する結合手段９とを具備している。   1 to 5, a shaft coupling mechanism 1 for an electric power steering apparatus according to this example includes a coupling base 3 coupled to a rotating shaft 2, and a coupling base 5 coupled to a steering shaft 4 serving as a rotating shaft. A pair of rotation transmitting members 6 and 7 that are arranged between the rotating shaft 2 and the steering shaft 4 via the connecting bases 3 and 5 and transmit the rotation of the rotating shaft 2 in the R direction to the steering shaft 4; The intermediate interposed member 8 disposed between the pair of rotation transmission members 6 and 7 and the coupling means 9 for coupling the pair of rotation transmission members 6 and 7 to each other are provided.

回転軸２は、電動式パワーステアリング装置の電動モータ側の回転軸であり、剛性の連結基体３は、特に図６に示すように、円環状の基部１１と、基部１１の軸方向、即ちＡ方向の一方の環状の面１２からＡ方向であって連結基体５に向かって一体的に突出していると共に軸心周りの方向、即ちＲ方向に９０°の等角度間隔で配された二対の突部１３と、回転軸２が嵌着された貫通孔１４とを具備しており、剛性の連結基体５は、特に図７に示すように、円環状の基部１６と、基部１６のＡ方向の一方の環状の面１７にＡ方向であって連結基体３に向かって一体的に突出していると共にＲ方向に９０°の等角度間隔で配された二対の突部１８と、ステアリング軸４が嵌着された貫通孔１９とを具備している。   The rotating shaft 2 is a rotating shaft on the electric motor side of the electric power steering apparatus, and the rigid connecting base 3 has an annular base portion 11 and an axial direction of the base portion 11, that is, A as shown in FIG. The two pairs of the two annular surfaces 12 that are integrally protruded from the one annular surface 12 in the direction A toward the connection base 5 and that are arranged at equal angular intervals of 90 ° in the direction around the axis, that is, in the R direction. As shown in FIG. 7, the rigid connecting base 5 includes a projecting portion 13 and a through-hole 14 in which the rotary shaft 2 is fitted. Two pairs of protrusions 18 that are integrally projected toward the connecting base 3 in the A direction on one of the annular surfaces 17 and are disposed at equal angular intervals of 90 ° in the R direction, and the steering shaft 4 And a through hole 19 in which is fitted.

突部１３の夫々は、Ｒ方向において一対の剛性回転伝達面としての平坦な側面２１及び２２を有しており、突部１８の夫々もまた、Ｒ方向において一対の剛性回転伝達面としての平坦な側面２３及び２４を有している。   Each of the protrusions 13 has flat side surfaces 21 and 22 as a pair of rigid rotation transmission surfaces in the R direction, and each of the protrusions 18 is also flat as a pair of rigid rotation transmission surfaces in the R direction. Side surfaces 23 and 24.

ポリアセタール樹脂、ポリアミド樹脂等から一体に形成されている剛性の回転伝達部材６は、特に図９に示すように、基部１１と同心に配された円環状の基部３１と、基部３１の円筒状の外周縁３２から径方向に伸びて基部３１に一体的に設けられていると共にＲ方向において４５°の等角度間隔で互いに離間して配された四対の突部３３と、基部３１の円筒状の内周縁３４にＡ方向に伸びると共にＲ方向において９０°の等角度間隔で互いに離間して設けられた四個の溝３５と、各溝３５の一端に連接されていると共に基部３１の内周縁３４であって面１２に対面する基部３１のＡ方向の一方の円環状の面３６に設けられた四個の係止溝３７と、面３６に当該面３６からＡ方向であって面１２に向かって突出して一体的に形成された突出部３８とを具備している。   A rigid rotation transmission member 6 integrally formed of polyacetal resin, polyamide resin or the like includes an annular base portion 31 concentrically with the base portion 11 and a cylindrical shape of the base portion 31 as shown in FIG. Four pairs of protrusions 33 extending in the radial direction from the outer peripheral edge 32 and provided integrally with the base 31 and spaced apart at equal angular intervals of 45 ° in the R direction, and the cylindrical shape of the base 31 Four grooves 35 extending in the A direction and spaced apart from each other at equal angular intervals of 90 ° in the R direction, and connected to one end of each groove 35 and the inner peripheral edge of the base 31 34, four locking grooves 37 provided on one annular surface 36 in the A direction of the base 31 facing the surface 12, and the surface 36 from the surface 36 in the A direction to the surface 12. Projecting portion 3 that is integrally formed by projecting toward 8 and.

各突部３３は、Ｒ方向において一対の剛性回転伝達面としての側面４１及び４２を有しており、各突部３３の中間介在部材８に対面する面４３は、Ｒ方向において中高になっている。   Each protrusion 33 has side surfaces 41 and 42 as a pair of rigid rotation transmission surfaces in the R direction, and a surface 43 of each protrusion 33 that faces the intermediate interposed member 8 becomes a medium height in the R direction. Yes.

突出部３８は、同心円上にＲ方向において９０°の等角度間隔で互いに離間して設けられた四個のＲ方向に伸びた円弧状の突起４５からなり、各突起４５のＡ方向の端面４６は、平坦であって互いに面一となっている。   The projecting portion 38 is composed of four arc-shaped projections 45 extending in the R direction and spaced apart from each other at an equal angular interval of 90 ° in the R direction on the concentric circle, and the end surface 46 of each projection 45 in the A direction. Are flat and flush with each other.

回転伝達部材６と同様にポリアセタール樹脂、ポリアミド樹脂等から一体に形成されている剛性の回転伝達部材７は、特に図１０に示すように、基部１６と同心に配された円環状の基部５１と、基部５１の円筒状の外周縁５２から径方向に伸びて基部５１に一体的に設けられていると共にＲ方向において４５°の等角度間隔で互いに離間して配された四対の突部５３と、基部５１の円筒状の内周縁５４にＡ方向に伸びると共にＲ方向において９０°の等角度間隔で互いに離間して設けられた四個の溝５５と、各溝５５の一端に連接されていると共に基部５１の内周縁５４であって面１７に対面する基部５１の一方の円環状の面５６に設けられた四個の係止溝５７と、面５６に当該面５６からＡ方向であって面１７に向かってに突出して一体的に形成された突出部５８とを具備して回転伝達部材６と同一に構成されている。   As shown in FIG. 10, a rigid rotation transmission member 7 integrally formed of polyacetal resin, polyamide resin or the like as in the rotation transmission member 6 has an annular base 51 concentrically with the base 16 as shown in FIG. The four pairs of protrusions 53 that extend in the radial direction from the cylindrical outer peripheral edge 52 of the base 51 and are provided integrally with the base 51 and spaced apart at equal angular intervals of 45 ° in the R direction. And four grooves 55 extending in the A direction and spaced apart from each other at an equal angular interval of 90 ° in the R direction, and connected to one end of each groove 55. And four locking grooves 57 provided on one annular surface 56 of the base 51 facing the surface 17, which is the inner peripheral edge 54 of the base 51, and the surface 56 in the A direction from the surface 56. Projecting toward the surface 17 The rotation transmitting member 6 has the same structure as the rotation transmitting member 6.

各突部５３は、Ｒ方向において一対の剛性回転伝達面としての側面６１及び６２を有しており、各突部５３の中間介在部材８に対面する面６３は、Ｒ方向において中高になっている。   Each protrusion 53 has side surfaces 61 and 62 as a pair of rigid rotation transmission surfaces in the R direction, and a surface 63 of each protrusion 53 that faces the intermediate interposed member 8 becomes a medium height in the R direction. Yes.

突出部５８は、同心円上にＲ方向において９０°の等角度間隔で互いに離間して設けられた四個のＲ方向に伸びた円弧状の突起６５からなり、各突起６５のＡ方向の端面６６は、平坦であって互いに面一となっている。   The projecting portion 58 is composed of four arc-shaped projections 65 extending in the R direction and spaced apart from each other at equal angular intervals of 90 ° in the R direction on the concentric circles. Are flat and flush with each other.

回転伝達部材６と回転伝達部材７とは、中間介在部材８を間にして、基部３１と基部５１とが、そして、突部３３の夫々と突部５３の夫々とが夫々Ａ方向において互いに対面するようにして同心に配されている。   The rotation transmitting member 6 and the rotation transmitting member 7 face each other in the A direction with the base 31 and the base 51, and the protrusions 33 and 53 respectively facing the intermediate interposed member 8. It is arranged concentrically.

回転伝達部材６及び７よりも小さな剛性を有すると共に弾性変形可能であってウレタンゴム、ポリエステルエラストマー等のゴム弾性体から一体形成されている中間介在部材８は、特に図８に示すように、基部３１及び５１と同心に配された円環状の基部７１と、基部７１の円筒状の外周縁７２から径方向に伸びて基部７１に一体的に設けられていると共にＲ方向において４５°の等角度間隔で互いに離間して配された四対の突部７３と、基部７１の円筒状の内周縁７４から径方向に伸びて基部７１に一体的に設けられていると共にＲ方向において４５°の等角度間隔で互いに離間して設けられた八個の係止突起７５とを具備しており、Ａ方向において一対の回転伝達部材６及び７に挟まれてしかもこれらに接触して配されている。   As shown in FIG. 8, the intermediate interposition member 8 having a rigidity smaller than that of the rotation transmitting members 6 and 7 and elastically deformable and integrally formed from a rubber elastic body such as urethane rubber or polyester elastomer, An annular base 71 concentrically arranged with 31 and 51, a cylindrical outer peripheral edge 72 of the base 71 extending in the radial direction and integrally provided on the base 71, and at an equal angle of 45 ° in the R direction Four pairs of protrusions 73 that are spaced apart from each other at intervals, and are provided integrally with the base 71 extending radially from the cylindrical inner peripheral edge 74 of the base 71 and at 45 ° in the R direction, etc. Eight locking projections 75 are provided spaced apart from each other at an angular interval, and are disposed between and in contact with the pair of rotation transmitting members 6 and 7 in the A direction.

中間介在部材８の各突部７３は、回転伝達部材６及び７の突部３３及び５３の夫々の剛性よりも小さな剛性を有すると共に弾性変形可能であり、各突部７３は、Ａ方向において回転伝達部材６及び７の対応の突部３３及び５３間の夫々に当該対応の突部３３及び５３の夫々に接触して配されていると共に突部３３及び５３の夫々のＲ方向の幅Ｄ１よりも大きな幅Ｄ２をもって形成されている。   Each protrusion 73 of the intermediate interposed member 8 has rigidity smaller than the rigidity of each of the protrusions 33 and 53 of the rotation transmitting members 6 and 7, and can be elastically deformed. Each protrusion 73 rotates in the A direction. From the corresponding protrusions 33 and 53 of the transmission members 6 and 7, respectively, in contact with the corresponding protrusions 33 and 53, respectively, and from the width D1 of the protrusions 33 and 53 in the R direction. Is also formed with a large width D2.

中間介在部材８は、回転伝達部材６に対面する面７６及び回転伝達部材７に対面する面７７で平坦になっており、各突部７３は、Ｒ方向において側面７８及び７９を有している。   The intermediate interposed member 8 is flat with a surface 76 facing the rotation transmitting member 6 and a surface 77 facing the rotation transmitting member 7, and each protrusion 73 has side surfaces 78 and 79 in the R direction. .

回転伝達部材６及び７と回転伝達部材６及び７間に挟まれた中間介在部材８とは、基部３１及び５１と基部７１とが、そして、突部３３及び５３の夫々と突部７３の夫々とが夫々Ａ方向において互いに接触して対面するようにして同心に配されている。   The rotation transmitting members 6 and 7 and the intermediate interposed member 8 sandwiched between the rotation transmitting members 6 and 7 include the base portions 31 and 51 and the base portion 71, and the protrusions 33 and 53 and the protrusion 73, respectively. Are concentrically arranged so as to contact each other and face each other in the A direction.

連結基体３の基部１１は、Ａ方向の一方の面１２で回転伝達部材６のＡ方向の面３６に一体的に形成された突出部３８の各突起４５の端面４６に接触しており、連結基体３の突部１３は、Ｒ方向における回転伝達部材６及び７の一対の突部３３及び５３間のうちの一方の突部３３及び５３間及びＲ方向における中間介在部材８の一対の突部７３間のうちの一方の突部７３間に配されていると共に回転伝達部材７の面５６を越えてＡ方向の先端面８１で連結基体５の基部１６の面１７に隙間８２をもって対面している。   The base 11 of the connection base 3 is in contact with the end face 46 of each protrusion 45 of the protrusion 38 formed integrally with the surface 36 in the A direction of the rotation transmitting member 6 on one surface 12 in the A direction. The protrusions 13 of the base 3 are formed between the protrusions 33 and 53 of the pair of protrusions 33 and 53 of the rotation transmitting members 6 and 7 in the R direction and the pair of protrusions of the intermediate interposed member 8 in the R direction. 73 is disposed between one of the protrusions 73, and faces the surface 17 of the base portion 16 of the connection base 5 with a gap 82 at the tip surface 81 in the A direction beyond the surface 56 of the rotation transmitting member 7. Yes.

連結基体５の基部１６は、Ａ方向の一方の面１７で回転伝達部材７のＡ方向の面５６に一体的に形成された突出部５８の各突起６５の端面６６に接触しており、連結基体５の突部１８は、Ｒ方向における回転伝達部材６及び７の一対の突部３３及び５３間のうちの他方の突部３３及び５３間及びＲ方向における中間介在部材８の一対の突部７３間のうちの他方の突部７３間に配されていると共に回転伝達部材６の面３６を越えてＡ方向の先端面８５で連結基体３の基部１１の面１２に隙間８６をもって対面している。   The base portion 16 of the connection base 5 is in contact with the end surface 66 of each protrusion 65 of the protrusion 58 formed integrally with the surface 56 in the A direction of the rotation transmitting member 7 on one surface 17 in the A direction. The protrusions 18 of the base 5 are formed between the other protrusions 33 and 53 of the pair of protrusions 33 and 53 of the rotation transmitting members 6 and 7 in the R direction and the pair of protrusions of the intermediate interposed member 8 in the R direction. 73, and is disposed between the other projections 73 and faces the surface 12 of the base 11 of the connection base 3 with a gap 86 at the front end surface 85 in the A direction beyond the surface 36 of the rotation transmitting member 6. Yes.

結合手段９は、回転伝達部材６の内周縁３４から回転伝達部材７の基部５１に向かって伸びて基部３１に一体的に設けられていると共に係止突起７５間のうちの一つおきの係止突起７５間及び溝５５を通って先端で係止溝５７において回転伝達部材７の基部５１の内周縁５４に引っ掛けられた四個のつめ部９１と、回転伝達部材７の内周縁５４から回転伝達部材６の環状の基部３１に向かって伸びて基部５１に一体的に設けられていると共に係止突起７５間のうちの残る一つおきの係止突起７５間及び溝３５を通って先端で係止溝３７において回転伝達部材６の基部３１の内周縁３４に引っ掛けられたつめ部９２とを具備しており、Ｒ方向において等角度間隔で互いに離間して配されたつめ部９１及び９２の夫々は、その先端に鉤部９３を有しており、各鉤部９３でもって係止溝５７における内周縁５４及び係止溝３７における内周縁３４の夫々に引っ掛けられており、斯かる結合手段９を介して回転伝達部材６及び７は中間介在部材８を挟んで相互に結合されており、中間介在部材８の係止突起７５は、結合手段９の両つめ部９１及び９２並びに基部３１及び５１で区画される空所９４に嵌合されている。   The coupling means 9 extends from the inner peripheral edge 34 of the rotation transmitting member 6 toward the base 51 of the rotation transmitting member 7 and is provided integrally with the base 31 and every other engagement between the locking projections 75. Four pawls 91 hooked on the inner peripheral edge 54 of the base 51 of the rotation transmitting member 7 in the locking groove 57 at the front end between the stop projections 75 and the groove 55, and the inner periphery 54 of the rotation transmitting member 7 rotate from the inner peripheral edge 54. It extends toward the annular base portion 31 of the transmission member 6 and is provided integrally with the base portion 51, and at the tip end between the remaining locking projections 75 among the locking projections 75 and through the grooves 35. The locking groove 37 includes a claw portion 92 that is hooked on the inner peripheral edge 34 of the base 31 of the rotation transmitting member 6, and claw portions 91 and 92 that are spaced apart from each other at equal angular intervals in the R direction. Each has a buttock 93 at its tip. The hooks 93 are respectively hooked on the inner peripheral edge 54 of the locking groove 57 and the inner peripheral edge 34 of the locking groove 37, and the rotation transmitting members 6 and 7 are intermediate between the connecting means 9. The engaging protrusions 75 of the intermediate interposing member 8 are fitted to a space 94 defined by both the claw portions 91 and 92 and the base portions 31 and 51 of the connecting means 9. ing.

中間介在部材８と、中間介在部材８を間にしてしかも結合手段９により相互に結合された回転伝達部材６及び７とに対して、連結基体３の突部１３の夫々は、Ｒ方向において、回転伝達部材６及び７の各対の突部３３及び５３間のうちの一方の突部３３及び５３間、すなわち一つおきの突部３３及び５３間及び中間介在部材８の各対の突部７３間のうちの一方の突部７３間、すなわち一つおきの突部７３間に配されており、連結基体５の突部１８の夫々は、Ｒ方向において、回転伝達部材６及び７の各対の突部３３及び５３間のうちの他方の突部３３及び５３間、すなわち残る一つおきの突部３３及び５３間及び中間介在部材８の各対の突部７３間のうちの他方の突部７３間、すなわち残る一つおきの突部７３間に配されており、回転軸２及びステアリング軸４の一定以下のＲ方向の相対回転では、連結基体３の各突部１３は、Ｒ方向のその各側面２１及び２２で、Ｒ方向において対面する中間介在部材８の各突部７３のＲ方向の側面７８及び７９に夫々接触している一方、Ｒ方向において対面する回転伝達部材６及び７の突部３３及び５３の側面４１及び４２並びに６１及び６２に夫々非接触となっており、連結基体５の各突部１８は、Ｒ方向のその各側面２３及び２４で、Ｒ方向において対面する中間介在部材８の各突部７３のＲ方向の側面７８及び７９に夫々接触している一方、Ｒ方向において対面する回転伝達部材６及び７の突部３３及び５３の側面４１及び４２並びに６１及び６２に夫々非接触となっている。   With respect to the intermediate transmission member 8 and the rotation transmission members 6 and 7 that are coupled to each other by the coupling means 9 with the intermediate mediation member 8 interposed therebetween, the projections 13 of the coupling base 3 are respectively in the R direction. Of each pair of projections 33 and 53 of the rotation transmitting members 6 and 7, between one projection 33 and 53, that is, between every other projection 33 and 53, and each pair of projections of the intermediate interposed member 8. 73, between one protrusion 73, that is, between every other protrusion 73, and each of the protrusions 18 of the connecting base 5 is each of the rotation transmitting members 6 and 7 in the R direction. Between the other protrusions 33 and 53 of the pair of protrusions 33 and 53, that is, between the remaining protrusions 33 and 53 and between the protrusions 73 of each pair of the intermediate interposed member 8. Between the protrusions 73, that is, between the remaining every other protrusion 73, the rotary shaft 2 and When the steering shaft 4 is rotated in the R direction below a certain level, each protrusion 13 of the connection base 3 is formed on each side surface 21 and 22 in the R direction with each protrusion 73 of the intermediate interposed member 8 facing in the R direction. While in contact with the side surfaces 78 and 79 in the R direction, respectively, the side surfaces 41 and 42 and 61 and 62 of the protrusions 33 and 53 of the rotation transmitting members 6 and 7 facing in the R direction are not in contact with each other. Each projection 18 of the connecting base 5 is in contact with the side surfaces 78 and 79 in the R direction of each projection 73 of the intermediate interposed member 8 facing in the R direction at the side surfaces 23 and 24 in the R direction, respectively. The side surfaces 41 and 42 and 61 and 62 of the protrusions 33 and 53 of the rotation transmitting members 6 and 7 facing each other in the R direction are not in contact with each other.

Ａ方向において中間介在部材８の突部７３に対面すると共にＲ方向において中高になっている回転伝達部材６及び７の突部３３及び５３の夫々は、Ｒ方向のその中央部では、対面する中間介在部材８において対応の突部７３の面７６及び７７の夫々と接触する一方、Ｒ方向のその縁部では、対面する中間介在部材８において対応の突部７３の面７６及び７７の夫々との間で空所９６を形成している。   Each of the protrusions 33 and 53 of the rotation transmitting members 6 and 7 facing the protrusion 73 of the intermediate interposed member 8 in the A direction and having a medium height in the R direction is an intermediate surface facing the central part in the R direction. While the intermediate member 8 contacts each of the surfaces 76 and 77 of the corresponding protrusion 73 in the interposition member 8, the edges of the corresponding protrusion 73 in the intermediate intermediate member 8 facing each other are in contact with each of the surfaces 76 and 77 of the corresponding protrusion 73. A void 96 is formed between them.

以上の二つの回転軸である回転軸２及びステアリング軸４を相互に連結する軸連結機構１を具備した電動式パワーステアリング装置では、ステアリングホイールが運転者により手動操作されると、ステアリング軸４がＲ方向に回転されて、ステアリング軸４のＲ方向の回転は、図示しない歯車等の伝達機構を介してドラッグ・リンク等に往復動として伝達されて操向輪（車輪）に対する操舵力を与える。運転者によるステアリングホイールの手動操作において、ステアリングホイールに加えられるトルクを検出するトルク検出器からの検出信号により制御される電動モータが作動されると、回転軸２がＲ方向に回転されて、突部１３による突部７３のＲ方向の変形後における側面４１及び７８への側面２１の接触又は側面４２及び７９への側面２２の接触に基づく突部１３による突部３３及び５３のＲ方向への押圧を介して連結基体３のＲ方向の回転が連結基体５の突部１８に伝達されて、これによりステアリング軸４のＲ方向の回転力に対して回転軸２のＲ方向の回転力を付加して運転者によるステアリングホイールの手動操作を補助するようになっている。   In the electric power steering apparatus provided with the shaft coupling mechanism 1 that couples the rotating shaft 2 and the steering shaft 4 as the above two rotating shafts, when the steering wheel is manually operated by the driver, the steering shaft 4 Rotated in the R direction, the rotation of the steering shaft 4 in the R direction is transmitted as a reciprocating motion to a drag link or the like via a transmission mechanism such as a gear (not shown) to give a steering force to the steered wheels (wheels). In the manual operation of the steering wheel by the driver, when the electric motor controlled by the detection signal from the torque detector that detects the torque applied to the steering wheel is operated, the rotary shaft 2 is rotated in the R direction, and The protrusions 33 and 53 in the R direction by the protrusion 13 based on the contact of the side surface 21 with the side surfaces 41 and 78 or the contact of the side surface 22 with the side surfaces 42 and 79 after the deformation of the protrusion 73 in the R direction by the portion 13. The rotation of the connecting base 3 in the R direction is transmitted to the protrusion 18 of the connecting base 5 through the pressing, thereby adding the rotational force of the rotating shaft 2 in the R direction to the rotational force of the steering shaft 4 in the R direction. Thus, the driver manually assists the steering wheel.

軸連結機構１では、ステアリングホイールが運転者により手動操作されないでステアリング軸４がＲ方向に回転されない状態又はステアリングホイールが運転者により手動操作されてステアリング軸４がＲ方向に回転される状態のいずれの状態においても、ステアリング軸４に対する回転軸２のＲ方向の相対回転が幅Ｄ２と幅Ｄ１との差の半分程度以内の微小なものである場合には、突部７３が容易に圧縮変形する結果、斯かる回転軸２の微小なＲ方向の相対回転はステアリング軸４には殆ど伝達されず、而して、軸連結機構１及びステアリング軸４を介する電動モータの反転時の衝撃、ブラシ振動のステアリングホイールへの伝達を低減でき操舵感覚を不快にさせないようにできる上に、突部７３の一定以上の圧縮変形後、側面４１及び７８への側面２１の接触又は側面４２及び７９への側面２２の接触が生じて突部７３のそれ以上の圧縮変形を抑止できる結果、突部７３の夫々のクリープによるへたりを防止でき、突部１３及び１８と突部７３とのＲ方向における側面２１及び２２並びに２３及び２４と側面７８及び７９との互いの接触を長期に亘って維持でき、ステアリング軸４と回転軸２との間にＲ方向についてのガタが生じ難いことになる。そして、回転伝達部材６及び７は、ステアリングホイールの運転者による手動操作でステアリング軸４がＲ方向に回転されると共に電動モータの作動で回転軸２がＲ方向に回転されてステアリング軸４に対して回転軸２が一定以上、すなわち幅Ｄ２と幅Ｄ１との差の半分程度以上にＲ方向に相対回転されようとする場合には、側面４１及び６１への側面２１の接触又は側面４２及び６２への側面２２の接触に基づく突部１３による突部３３及び５３のＲ方向への押圧でもって斯かる一定以上のＲ方向の相対回転に応答して回転軸２のＲ方向の回転をステアリング軸４に伝達してステアリング軸４の回転を補助するようになる。   In the shaft coupling mechanism 1, either the state where the steering wheel is not manually operated by the driver and the steering shaft 4 is not rotated in the R direction or the state where the steering wheel is manually operated by the driver and the steering shaft 4 is rotated in the R direction. Even in this state, when the relative rotation in the R direction of the rotating shaft 2 with respect to the steering shaft 4 is a minute one within about half of the difference between the width D2 and the width D1, the protrusion 73 is easily compressed and deformed. As a result, such a small relative rotation in the R direction of the rotating shaft 2 is hardly transmitted to the steering shaft 4, and thus the impact and brush vibration at the time of reversal of the electric motor via the shaft coupling mechanism 1 and the steering shaft 4. The transmission to the steering wheel can be reduced so as not to make the steering feeling uncomfortable. As a result of contact of the side surface 21 with the side surface 22 or contact of the side surface 22 with the side surfaces 42 and 79, further compressive deformation of the projection 73 can be suppressed, so that the projection 73 can be prevented from sag due to creep. 13 and 18 and the protrusion 73 can maintain the mutual contact of the side surfaces 21 and 22 and 23 and 24 with the side surfaces 78 and 79 in the R direction over a long period of time, and the R between the steering shaft 4 and the rotating shaft 2 can be maintained. It will be difficult for the direction to play. The rotation transmitting members 6 and 7 rotate the steering shaft 4 in the R direction by manual operation by the driver of the steering wheel and rotate the rotating shaft 2 in the R direction by the operation of the electric motor. Thus, when the rotation shaft 2 is to be rotated relative to the R direction by a certain amount or more, that is, about half or more of the difference between the width D2 and the width D1, the side surface 21 contacts the side surfaces 41 and 61 or the side surfaces 42 and 62. The rotation of the rotating shaft 2 in the R direction in response to the relative rotation in the R direction of a certain level or more by the pressing of the protruding portions 33 and 53 in the R direction by the protruding portion 13 based on the contact of the side surface 22 with the steering shaft. 4 to assist the rotation of the steering shaft 4.

以上の軸連結機構１によれば、回転伝達部材６及び７の夫々が基部３１及び５１の面３６及び５６に一体的に形成された突出部３８及び５８を具備しており、連結基体３の基部１１がその面１２で回転伝達部材６の面３６に一体的に形成された突出部３８の面４６に接触しており、連結基体５の基部１６がその面１７で回転伝達部材７の面５６に一体的に形成された突出部５８の面６６に接触しており、Ｒ方向における一対の回転伝達部材６及び７の突部３３及び５３間のうちの一つおきの突部３３及び５３間並びにＲ方向における中間介在部材８の突部７３間のうちの一つおきの突部７３間に配されている連結基体３の突部１３が回転伝達部材７の面５６を越えてＡ方向の先端面８１で連結基体５の基部１６の面１７に隙間８２をもって対面しており、Ｒ方向における一対の回転伝達部材６及び７の突部３３及び５３間のうちの残る一つおきの突部７３及び５３間並びにＲ方向における中間介在部材８の突部７３間のうちの残る一つおきの突部７３間に配されている連結基体５の突部１８が回転伝達部材６の面３６を越えてＡ方向の先端面８５で連結基体３の基部１１の面１２に隙間８６をもって対面しているために、中間介在部材８にＡ方向の弾性圧縮変形を生じさせる回転軸２の回転軸４に対するＡ方向の相対的な変位において、連結基体３の突部１３の先端面８１と連結基体５の基部１６の面１７との衝突、接触及び連結基体５の突部１８の先端面８５と連結基体３の基部１１の面１２との衝突、接触を避けることができ、しかも、連結基体３及び５の突部１３及び１８を、その側面２１及び２２並びに側面２３及び２４で回転伝達部材６及び７の突部３３及び５３の側面４１及び４２並びに側面６１及び６２の全面にＲ方向において接触させることができ、而して、衝突音の発生を回避できる上に、回転軸２のＲ方向の回転の回転軸４への伝達においては不快な摩擦音を生じさせることがなく、しかも、連結基体３及び５の夫々の突部１３及び１８の回転伝達部材６及び７の突部３３及び５３の夫々へのＲ方向における接触面積を所望に確保できて、耐久性を向上できる。   According to the above-described shaft coupling mechanism 1, each of the rotation transmitting members 6 and 7 includes the protruding portions 38 and 58 formed integrally with the surfaces 36 and 56 of the base portions 31 and 51. The base 11 is in contact with the surface 46 of the protrusion 38 formed integrally with the surface 36 of the rotation transmitting member 6 at the surface 12, and the base 16 of the connecting base 5 is at the surface 17 of the surface of the rotation transmitting member 7. 56, which is in contact with the surface 66 of the protrusion 58 formed integrally with each other, and every other protrusion 33 and 53 between the protrusions 33 and 53 of the pair of rotation transmitting members 6 and 7 in the R direction. The protrusions 13 of the connection base 3 arranged between every other protrusion 73 among the protrusions 73 of the intermediate interposed member 8 in the R direction extend beyond the surface 56 of the rotation transmitting member 7 in the A direction. The front end surface 81 is opposed to the surface 17 of the base portion 16 of the connection base 5 with a gap 82. Between the remaining protrusions 73 and 53 of the pair of rotation transmitting members 6 and 7 in the R direction and between the protrusions 73 of the intermediate interposed member 8 in the R direction. The protrusions 18 of the connection base 5 disposed between the remaining protrusions 73 of each of the connections exceed the surface 36 of the rotation transmitting member 6 and the surface 12 of the base 11 of the connection base 3 at the tip surface 85 in the A direction. Because of the gap 86 facing each other, the relative displacement in the A direction with respect to the rotary shaft 4 of the rotary shaft 2 causing the intermediate interposed member 8 to undergo elastic compressive deformation in the A direction causes the protrusion 13 of the connecting base 3 to move. Collision and contact between the front end surface 81 and the surface 17 of the base portion 16 of the connection base 5 and collision and contact between the front end surface 85 of the protrusion 18 of the connection base 5 and the surface 12 of the base portion 11 of the connection base 3 can be avoided. Moreover, the protrusions 13 and 18 of the connecting bases 3 and 5 are The side surfaces 21 and 22 and the side surfaces 23 and 24 can contact the entire surfaces of the side surfaces 41 and 42 and the side surfaces 61 and 62 of the protrusions 33 and 53 of the rotation transmitting members 6 and 7 in the R direction. In addition to avoiding the generation of noise, the transmission of the rotation of the rotation shaft 2 in the R direction to the rotation shaft 4 does not cause an unpleasant frictional sound, and the projections 13 of the connection bases 3 and 5 The contact area in the R direction to each of the protrusions 33 and 53 of the 18 rotation transmission members 6 and 7 can be ensured as desired, and the durability can be improved.

また、軸連結機構１によれば、Ａ方向において回転伝達部材６及び７間に配されている中間介在部材８がＡ方向において回転伝達部材６及び７の突部３３及び５３間の夫々に配されていると共に突部３３及び５３の夫々のＲ方向の幅Ｄ１よりも大きな幅Ｄ２をもった突部７３を有しており、中間介在部材８の各突部７３が回転伝達部材６及び７の突部３３及び５３の夫々の剛性よりも小さな剛性を有している結果、回転軸２のＲ方向の回転のステアリング軸４への伝達が中間介在部材８の突部７３の弾性変形を介して行われるために、回転軸２のＲ方向の微小な回転のステアリング軸４への伝達を中間介在部材８の突部７３の弾性変形で低減又は阻止できると共に回転軸２のステアリング軸４に対する大きなＲ方向の相対回転のステアリング軸４への伝達を中間介在部材８の突部７３よりも大きな剛性を有している回転伝達部材６及び７を介してそのまま行い得、しかも、ステアリング軸４に対する回転軸２のＲ方向の一定以上の相対回転では大きい剛性をもった回転伝達部材６及び７で中間介在部材８の突部７３の大きな弾性変形を阻止できるために、中間介在部材８に対して柔軟性のある剛性の小さい樹脂材料を用いてもクリープによる中間介在部材８の永久的な変形を低減でき、その上、一対の回転伝達部材６及び７が結合手段９を介して相互に連結されているために、組み付け性を向上できると共に中間介在部材８の弾性変形による一対の回転伝達部材６及び７のＡ方向の相互の離反をなくし得て一対の回転伝達部材６及び７のＡ方向の広がりを一定に抑えることができ、而して、電動モータの反転時の衝撃、ブラシ振動のステアリングホイールへの伝達を低減できる上に回転軸２及びステアリング軸４間のＲ方向についてのガタをなくし得て、操舵感覚を不快にさせないと共に耐久性に優れ特性の安定したものとし得る。   Further, according to the shaft coupling mechanism 1, the intermediate interposed member 8 disposed between the rotation transmitting members 6 and 7 in the A direction is disposed between the protrusions 33 and 53 of the rotation transmitting members 6 and 7 in the A direction. And a protrusion 73 having a width D2 larger than the width D1 in the R direction of each of the protrusions 33 and 53, and the protrusions 73 of the intermediate interposed member 8 are connected to the rotation transmitting members 6 and 7 respectively. As a result, the rotation of the rotating shaft 2 in the R direction is transmitted to the steering shaft 4 through elastic deformation of the protruding portion 73 of the intermediate interposed member 8. Therefore, transmission of minute rotation of the rotating shaft 2 in the R direction to the steering shaft 4 can be reduced or prevented by elastic deformation of the protrusion 73 of the intermediate interposed member 8, and the rotating shaft 2 with respect to the steering shaft 4 can be largely prevented. R-direction relative steering 4 can be transmitted as it is through the rotation transmission members 6 and 7 having rigidity higher than the protrusion 73 of the intermediate interposed member 8, and more than a certain amount in the R direction of the rotation shaft 2 with respect to the steering shaft 4. In the relative rotation, the rotation transmitting members 6 and 7 having high rigidity can prevent large elastic deformation of the protrusion 73 of the intermediate interposed member 8, so that the intermediate intermediate member 8 is flexible and has a low rigidity resin material. Can be used to reduce the permanent deformation of the intermediate interposed member 8 due to creep, and the pair of rotation transmitting members 6 and 7 are connected to each other via the coupling means 9 to improve the assembling property. In addition, it is possible to eliminate the mutual separation of the pair of rotation transmission members 6 and 7 in the A direction due to the elastic deformation of the intermediate interposed member 8, and to suppress the spread of the pair of rotation transmission members 6 and 7 in the A direction constant, In addition, it is possible to reduce the impact at the time of reversal of the electric motor and the transmission of brush vibration to the steering wheel, and to eliminate the play in the R direction between the rotating shaft 2 and the steering shaft 4, and to make the steering feeling uncomfortable. It can have excellent durability and stable characteristics.

更に、軸連結機構１によれば、係止突起７５により中間介在部材８が結合手段９の両つめ部９１及び９２で区画される空所９４を介して一対の回転伝達部材６及び７に対してＲ方向に関して位置決めされているために、回転軸２及びステアリング軸４の相対的なＲ方向の両方の回転に対して中間介在部材８による効果を均等に得ることができる。   Further, according to the shaft coupling mechanism 1, the intermediate interposed member 8 is separated from the pair of rotation transmission members 6 and 7 through the space 94 defined by the claw portions 91 and 92 of the coupling means 9 by the locking projection 75. Therefore, the effect of the intermediate interposed member 8 can be obtained evenly with respect to the rotation of both the rotation shaft 2 and the steering shaft 4 in the relative R direction.

加えて、軸連結機構１によれば、空所９６が形成されているために、中間介在部材８の各突部７３におけるＲ方向の縁部の圧縮変形されて潰れた膨らみを空所９６で吸収できる結果、一対の回転伝達部材６及び７のＡ方向において互いに対面する突部３３及び５３の相互離反を避けることができる上に、圧縮変形されて潰れた中間介在部材８の突部７３の一部が突部３３及び５３の側面４１及び４２並びに６１及び６２に展延して突部３３及び５３の側面４１及び４２並びに６１及び６２を覆うことがなくなる結果、中間介在部材８の各突部７３のクリープによるへたりをより効果的に防止でき、而して、一対の回転伝達部材６及び７のＲ方向の剛性を維持でき、安定した回転力の伝達を行い得る。   In addition, according to the shaft coupling mechanism 1, since the voids 96 are formed, the bulges that are compressed and deformed at the edges in the R direction at the respective protrusions 73 of the intermediate interposed member 8 are collapsed in the voids 96. As a result of the absorption, the protrusions 33 and 53 facing each other in the A direction of the pair of rotation transmitting members 6 and 7 can be prevented from being separated from each other, and the protrusion 73 of the intermediate interposed member 8 that is compressed and deformed is crushed. As a result, a part of the projections 33 and 53 extends to the side surfaces 41 and 42 and 61 and 62 so as not to cover the side surfaces 41 and 42 and 61 and 62 of the projections 33 and 53. The sag due to creep of the portion 73 can be more effectively prevented, and thus the rigidity in the R direction of the pair of rotation transmitting members 6 and 7 can be maintained, and a stable rotational force can be transmitted.

上記の例の軸連結機構１は、一個の中間介在部材８からなっているが、これに代えて、二個以上の中間介在部材８からなっていてもよく、回転伝達部材６及び７の夫々もまた二個以上からなっていてもよい。また、連結基体３及び５の突部１３及び１８、回転伝達部材６及び７の突部３３及び５３、中間介在部材８の突部７３、結合手段９のつめ部９１及び９２並びに中間介在部材８の係止突起７５は、上記の個数に限らないのである。   The shaft coupling mechanism 1 in the above example is composed of one intermediate interposed member 8, but may instead be composed of two or more intermediate interposed members 8, and each of the rotation transmitting members 6 and 7. May also consist of two or more. Further, the protrusions 13 and 18 of the coupling bases 3 and 5, the protrusions 33 and 53 of the rotation transmitting members 6 and 7, the protrusion 73 of the intermediate interposed member 8, the pawls 91 and 92 of the coupling means 9, and the intermediate interposed member 8. The number of the locking protrusions 75 is not limited to the above number.

１ 軸連結機構
２ 回転軸
３、５ 連結基体
４ ステアリング軸
６、７ 回転伝達部材
８ 中間介在部材
９ 結合手段 DESCRIPTION OF SYMBOLS 1 Shaft coupling mechanism 2 Rotating shaft 3, 5 Connecting base 4 Steering shaft 6, 7 Rotation transmission member 8 Intermediate interposed member 9 Coupling means

Claims (2)

一方の回転軸の回転を他方の回転軸に伝達するように二つの回転軸の間に配されて二つの回転軸を連結する軸連結機構であって、一対の回転伝達部材と、この一対の回転伝達部材間に配されている中間介在部材と、一方の回転軸に連結される一方の連結基体と、他方の回転軸に連結される他方の連結基体とを具備しており、一対の回転伝達部材の夫々は、基部と、軸心周りの方向において互いに離間していると共に対応の基部の外周縁から径方向に伸びて当該基部に一体的に設けられた少なくとも一対の突部と、基部の一方の軸方向の面に一体的に形成された突出部とを有しており、中間介在部材は、軸方向において一対の回転伝達部材の一対の突部間に配されていると共に各対の突部における軸心周りの方向の幅よりも大きな幅をもった一対の突部を有しており、中間介在部材の一対の突部は、一対の回転伝達部材の夫々の一対の突部の剛性よりも小さな剛性を有すると共に弾性変形可能であり、一方及び他方の連結基体は、基部と、この基部の軸方向の一方の面から軸方向に一体的に突出した突部とを夫々具備しており、一方の連結基体の基部は、その軸方向の一方の面で一方の回転伝達部材の一方の軸方向の面に一体的に形成された突出部に接触しており、他方の連結基体の基部は、その軸方向の一方の面で他方の回転伝達部材の一方の軸方向の面に一体的に形成された突出部に接触しており、一方の連結基体の突部は、軸心周りの方向における一対の回転伝達部材の各対の突部間のうちの一方の突部間及び軸心周りの方向における中間介在部材の一対の突部間のうちの一方の突部間に配されていると共に他方の回転伝達部材の一方の軸方向の面を越えて軸方向の先端面で他方の連結基体の基部の軸方向の一方の面に隙間をもって対面しており、他方の連結基体の突部は、軸心周りの方向における一対の回転伝達部材の一対の突部間のうちの他方の突部間及び軸心周りの方向における中間介在部材の一対の突部間のうちの他方の突部間に配されていると共に一方の回転伝達部材の一方の軸方向の面を越えて軸方向の先端面で一方の連結基体の基部の軸方向の一方の面に隙間をもって対面している軸連結機構。   A shaft coupling mechanism that is arranged between two rotary shafts so as to transmit the rotation of one rotary shaft to the other rotary shaft and connects the two rotary shafts. An intermediate interposed member disposed between the rotation transmitting members, one connection base connected to one rotation shaft, and the other connection base connected to the other rotation shaft, and a pair of rotations Each of the transmission members includes a base, at least a pair of protrusions that are spaced apart from each other in a direction around the axis and extend radially from the outer peripheral edge of the corresponding base, and are integrally provided on the base. The intermediate interposed member is disposed between the pair of protrusions of the pair of rotation transmitting members in the axial direction and each pair of the intermediate interposed members. One with a width larger than the width in the direction around the axis of the protrusion The pair of protrusions of the intermediate interposed member have a rigidity smaller than the rigidity of the pair of protrusions of the pair of rotation transmitting members and can be elastically deformed. The connection base includes a base and a protrusion integrally protruding in the axial direction from one axial surface of the base, and the base of the one connection base is one surface in the axial direction. In contact with a protrusion formed integrally on one axial surface of one rotation transmission member, and the base of the other connecting base is connected to the other rotation transmission member on one axial surface. One of the protrusions of the connecting base is in contact with the protrusion formed integrally with the surface in one axial direction, and the protrusion of one of the coupling bases is between the pair of protrusions of the pair of rotation transmitting members in the direction around the axis. One of the pair of protrusions of the intermediate interposition member in the direction between the one protrusions and around the axis It is arranged between the protrusions and faces the one axial surface of the base of the other connecting base with a gap at the front end surface in the axial direction beyond one axial surface of the other rotation transmission member The protrusions of the other coupling base are the pair of protrusions of the intermediate interposed member in the direction between the other protrusions and in the direction around the axis among the pair of protrusions of the pair of rotation transmitting members in the direction around the axis. Between the other projections of the gaps and beyond one axial surface of one rotation transmitting member to one axial surface of the base portion of one connecting base at the axial front end surface. Shaft coupling mechanism facing with a gap. 一対の回転伝達部材の夫々の突出部は、軸心周りの方向において互いに離間されていると共に平坦であって互いに面一な軸方向の端面を有している複数個の軸心周りの方向に伸びた円弧状の突起を具備している請求項1に記載の軸連結機構。   The protrusions of the pair of rotation transmitting members are spaced apart from each other in a direction around the axis and are flat and have a plurality of axial end faces that are flush with each other. 2. The shaft coupling mechanism according to claim 1, further comprising an elongated arc-shaped protrusion.
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2014040925A (en) * 2013-11-14 2014-03-06 Oiles Ind Co Ltd Shaft connecting mechanism

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0610641U (en) * 1992-07-13 1994-02-10 株式会社フコク Rotation transmission shock absorber
JP2004322688A (en) * 2003-04-21 2004-11-18 Mitsubishi Automob Eng Co Ltd Elastic shaft coupling
JP2006183676A (en) * 2004-12-24 2006-07-13 Oiles Ind Co Ltd Shaft connecting mechanism for electric power steering device

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0610641U (en) * 1992-07-13 1994-02-10 株式会社フコク Rotation transmission shock absorber
JP2004322688A (en) * 2003-04-21 2004-11-18 Mitsubishi Automob Eng Co Ltd Elastic shaft coupling
JP2006183676A (en) * 2004-12-24 2006-07-13 Oiles Ind Co Ltd Shaft connecting mechanism for electric power steering device

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2014040925A (en) * 2013-11-14 2014-03-06 Oiles Ind Co Ltd Shaft connecting mechanism

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