JP2010164162A - Shaft coupling mechanism - Google Patents

Shaft coupling mechanism Download PDF

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JP2010164162A
JP2010164162A JP2009008248A JP2009008248A JP2010164162A JP 2010164162 A JP2010164162 A JP 2010164162A JP 2009008248 A JP2009008248 A JP 2009008248A JP 2009008248 A JP2009008248 A JP 2009008248A JP 2010164162 A JP2010164162 A JP 2010164162A
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rotation transmission
base
transmission member
rotation
shaft
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JP5332633B2 (en
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Noboru Nakagawa
昇 中川
Daisuke Yoshimoto
大介 吉本
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Oiles Industry Co Ltd
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Oiles Industry Co Ltd
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a shaft coupling mechanism that resists axial angular play between a rotary shaft coupled to an output rotary shaft of an electric motor and a ball screw even after a long period of use, and can not only reduce the transmission of reversing impacts and brush vibrations of the electric motor but also eliminate noise generation. <P>SOLUTION: The shaft coupling mechanism 1 includes a coupling base 3 coupled to a rotary shaft 2, a coupling base 5 coupled to a rotary shaft 4, and a rotation transmitter 8 having a pair of insert-molded rotation transmission members 6 and 7, and is operatively disposed between the two rotary shafts 2 and 4 for transmitting a rotation of the rotary shaft 2 in an R direction to the rotary shaft 4 to couple the two rotary shafts 2 and 4. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

本発明は、例えば、電磁ダンパにおける電動モータの出力回転軸とボールねじとを連結するに適した軸連結機構又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等の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に関する。   The present invention relates to, for example, a shaft coupling mechanism suitable for coupling an output rotation shaft of an electric motor in an electromagnetic damper and a ball screw, or a rotation shaft on the side of a rotation source such as an electric motor in an electric power steering device, and a steering shaft of an automobile. Such as a shaft coupling mechanism suitable for connecting the rotating shaft on the operating side, etc., so that the rotation of one rotating shaft is transmitted to the other rotating shaft and the two rotating shafts are arranged between the two rotating shafts. The present invention relates to a shaft coupling mechanism to be coupled.

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。   The electric power steering apparatus can easily perform manual steering of the steering wheel by adding the rotational force based on the rotation of the output rotation shaft of the electric motor to the rotational force based on the rotation of the manually operated steering wheel (handle). In such an electric power steering device, the steering shaft on the steering wheel side and the rotating shaft on the output rotating shaft side of the electric motor are coupled via a shaft coupling mechanism (coupling). Yes.

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。   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 a spacer such as rubber or soft resin in the shaft coupling mechanism.

特開2007−118714号公報JP 2007-118714 A 特許第4116796号公報Japanese Patent No. 4116796 特開2005−170341号公報JP 2005-170341 A 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、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を回避すべく、径方向に伸びた複数の突部を有した一対の硬質のスペーサ部材と軸方向においてこの一対の硬質のスペーサ部材の間に配された軟質であって弾性変形可能である径方向に伸びた複数の突部を有したスペーサ部材とを具備した軸連結機構が提案されている。   By the way, if the spacer is made more flexible by placing importance on the reduction of impact and vibration, the flexible spacer is likely to undergo creep deformation. Therefore, the shaft coupling mechanism is not rattled by permanent deformation of the spacer due to repeated load on the spacer. In order to avoid the possibility that the driver's steering feeling becomes uncomfortable, this also causes a pair of hard spacer members having a plurality of radially extending protrusions and the pair of hard spacer members in the axial direction. There has been proposed a shaft coupling mechanism including a spacer member having a plurality of radially extending projections that are soft and elastically deformable disposed between the spacer members.

斯かる軸連結機構では、軸心周りの方向において一対の硬質のスペーサ部材の側面が露出するために、回転軸に連結される連結基体の突起によるこれら一対の硬質のスペーサ部材の間に配された弾性変形可能なスペーサ部材の複数の突部の弾性変形後におけるこれら一対の硬質のスペーサ部材の側面への当該連結基体の突起の衝突により、異音(衝突音)を発生する虞があり、斯かる異音(衝突音)も、運転者に不快な操舵感を生じさせることになる。   In such a shaft coupling mechanism, the side surfaces of the pair of hard spacer members are exposed in the direction around the shaft center, and therefore, the shaft coupling mechanism is arranged between the pair of hard spacer members by the protrusions of the coupling base coupled to the rotating shaft. There is a possibility that abnormal noise (collision noise) may be generated due to the collision of the protrusions of the connection base to the side surfaces of the pair of hard spacer members after the elastic deformation of the plurality of protrusions of the elastically deformable spacer member, Such abnormal noise (collision noise) also causes an unpleasant steering feeling to the driver.

斯かる問題は、電動モータの出力回転軸とナットを介してピストンに連結されたボールねじとを連結する特許文献1から3に記載の軸連結機構においても同様に生じ得る。   Such a problem can also occur in the shaft coupling mechanism described in Patent Documents 1 to 3 that couples the output rotation shaft of the electric motor and the ball screw coupled to the piston via the nut.

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、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又はナットを介してピストンに連結されたボールねじ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又はピストンへの伝達を低減できるのみならず、異音(衝突音)の発生をなくし得、而して、耐久性に優れていると共に、自動車の電動式パワーステアリング装置に適用される場合には、操舵感覚を不快にさせ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-mentioned points. The object of the present invention is to provide a rotary shaft connected to an output rotary shaft of an electric motor, for example, the rotary shaft and the other rotary shaft, even after long-term use. The backlash in the direction around the axis is hardly generated between the rotating shaft, for example, the steering shaft connected to the steering wheel or the ball screw connected to the piston via the nut, and the impact when the electric motor is reversed In addition to being able to reduce the transmission of brush vibration to the steering wheel or piston, it is also possible to eliminate the generation of abnormal noise (collision noise), and thus it is excellent in durability and can be used as an electric power steering device for automobiles. When applied, the object is to provide a shaft coupling mechanism that does not make the steering feeling uncomfortable.

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本発明による軸連結機構は、一対の回転伝達部材を含む回転伝達体を具備しており、回転伝達体の一方の回転伝達部材は、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基部の外周面から一体的に径方向外方向に向かって伸びた複数の突部とを有しており、回転伝達体の他方の回転伝達部材は、一方の回転伝達部材の基部に埋設されている基部と、軸心周りの方向において互いに離間していると共に当該他方の回転伝達部材の基部の外周面から一体的に径方向外方向に向かって伸びて一方の回転伝達部材の突部に埋設されている突部とを有しており、一対の回転伝達部材は、他方の回転伝達部材の基部の少なくとも径方向における外周面が当該基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る一方の回転伝達部材の基部により覆われていると共に他方の回転伝達部材の突部の少なくとも軸心周りの方向及び軸方向における側面が当該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る一方の回転伝達部材の対応の突部により覆われるようにして、インサート成形されてなる。   The shaft coupling mechanism according to the present invention, which is arranged between two rotating shafts so as to transmit the rotation of one rotating shaft to the other rotating shaft and connects the two rotating shafts, includes a pair of rotation transmitting members. One rotation transmission member of the rotation transmission body is separated from each other in the direction around the shaft center and extends radially outward from the outer peripheral surface of the base. The other rotation transmission member of the rotation transmission body is spaced apart from the base embedded in the base of one rotation transmission member in the direction around the axis and A pair of rotation transmission members, each having a protrusion extending from the outer peripheral surface of the base portion of the other rotation transmission member integrally in the radially outward direction and embedded in the protrusion of the one rotation transmission member. Is at least the radial direction of the base of the other rotation transmission member The outer peripheral surface is covered with the base of one rotation transmission member having a rigidity smaller than that of the base and elastically deformable, and at least the direction and axis around the axis of the protrusion of the other rotation transmission member The side surface in the direction is insert-molded so as to be covered by a corresponding protrusion of one rotation transmission member having rigidity smaller than that of the protrusion and elastically deformable.

本発明の軸連結機構によれば、一方の回転軸の回転の他方の回転軸への伝達が一方の回転伝達部材の複数の突部の弾性変形を介して行われるために、一方の回転軸の微小な回転の他方の回転軸への伝達を一方の回転伝達部材の複数の突部の弾性変形で低減又は阻止できると共に一方の回転軸の他方の回転軸に対する大きな相対回転の他方の回転軸への伝達を一方の回転伝達部材の突部よりも大きな剛性を有している他方の回転伝達部材の突部を介して行い得、しかも、一方の回転伝達部材が他方の回転伝達部材の突部の個数よりも多い個数の突部を有している場合には、一方の回転伝達部材の突部における軸心周りの方向の一定以上の弾性変形では大きい剛性をもった他方の回転伝達部材の突部により当該他方の回転伝達部材の突部を覆わない一方の回転伝達部材の突部の大きな弾性変形を阻止できるために、柔軟性のある剛性の小さい樹脂材料を一方の回転伝達部材に対して用いても、他方の回転伝達部材の突部を覆わない一方の回転伝達部材の突部のクリープによる永久的な変形を低減でき、その上、他方の回転伝達部材の突部の軸心周りの方向における側面は、当該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る一方の回転伝達部材の対応の突部により覆われているために、他方の回転伝達部材の突部の軸心周りの方向における側面への連結基体の突部の直接的な衝突を回避でき、而して、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又はボールねじとの間に軸心周りの方向についてのガタが生じ難く、加えて、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又はボールねじへの伝達を低減できるのみならず、異音(衝突音)の発生をなくし得て、耐久性に優れ操舵感覚を不快にさせない軸連結機構を提供することができる。   According to the shaft coupling mechanism of the present invention, since the rotation of one rotation shaft is transmitted to the other rotation shaft through the elastic deformation of the plurality of protrusions of one rotation transmission member, The transmission of the minute rotation of the one rotation shaft to the other rotation shaft can be reduced or prevented by elastic deformation of the plurality of protrusions of the one rotation transmission member, and the other rotation shaft of the large relative rotation of the one rotation shaft with respect to the other rotation shaft Can be transmitted through the projection of the other rotation transmission member having rigidity greater than that of the projection of one rotation transmission member, and one rotation transmission member can project from the projection of the other rotation transmission member. When the number of protrusions is greater than the number of protrusions, the other rotation transmission member having a large rigidity in the elastic deformation of a certain direction or more in the direction around the axis of the protrusion of one rotation transmission member. Do not cover the projection of the other rotation transmission member with this projection. Since the large elastic deformation of the protrusion of one rotation transmission member can be prevented, the protrusion of the other rotation transmission member is covered even if a flexible and low-resin resin material is used for one rotation transmission member. Permanent deformation due to creep of the projection of one of the rotation transmission members can be reduced, and the side surface in the direction around the axis of the projection of the other rotation transmission member is less rigid than the rigidity of the projection. And is covered with a corresponding protrusion of one rotation transmission member that is elastically deformable, and therefore the protrusion of the connection base to the side surface in the direction around the axis of the protrusion of the other rotation transmission member. A direct collision can be avoided, and even with a long-term use, it is connected to one rotating shaft such as an output rotating shaft of an electric motor and the other rotating shaft such as a steering wheel. Steari The backlash in the direction around the shaft center is less likely to occur between the gear shaft and the ball screw, and in addition, not only can the impact during reversal of the electric motor, the transmission of brush vibration to the steering wheel or ball screw be reduced, It is possible to provide a shaft coupling mechanism that can eliminate the occurrence of abnormal noise (collision noise) and has excellent durability and does not make the steering feeling uncomfortable.

一方の回転伝達部材は、他方の回転伝達部材の突部の個数と同数の個数の突部を有していてもよいが、これに代えて、上述のように、他方の回転伝達部材の突部の個数よりも多い個数の突部を有して、当該他方の回転伝達部材の突部の軸心周りの方向における側面を覆わない突部を有していると、当該一方の回転伝達部材の突部での大きな弾性変形が生じない結果、当該一方の回転伝達部材の突部のクリープによる永久的な変形を低減できて、一方の回転軸の回転の他方の回転軸への一方の回転伝達部材の突部の弾性変形を介する伝達を長期に亘って維持できることになり好ましい。   One rotation transmission member may have the same number of protrusions as the number of protrusions of the other rotation transmission member, but instead, as described above, the protrusion of the other rotation transmission member. One of the rotation transmission members has a larger number of projections than the number of the projections and does not cover the side surface in the direction around the axis of the projection of the other rotation transmission member. As a result of the fact that no large elastic deformation occurs at the projection of the one, the permanent deformation due to creep of the projection of the one rotation transmission member can be reduced, and one rotation of the rotation of one rotation shaft to the other rotation shaft This is preferable because transmission through elastic deformation of the protrusion of the transmission member can be maintained for a long period of time.

一対の回転伝達部材の夫々の突部は、径方向外方向の先端部で自由端となっていてもよく、これに代えて、一対の回転伝達部材の夫々の突部は、径方向外方向の先端部で相互に連結されていてもよい。   Each protrusion of the pair of rotation transmitting members may be a free end at the distal end portion in the radially outer direction. Instead, each protrusion of the pair of rotation transmitting members is radially outward. They may be connected to each other at their tip portions.

本発明において、一方の回転伝達部材の基部及び突部は、ウレタンゴム、シリコーンゴム、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く、他方の回転伝達部材は、アルミを含む剛性金属又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ているとよいが、その他の硬質の樹脂から形成されていてもよい。   In the present invention, the base and the protrusion of one rotation transmission member may be formed of a rubber elastic body such as urethane rubber, silicone rubber, polyester elastomer, and the other rotation transmission member may be a rigid metal including aluminum or Although it is good to form from hard resin, such as a polyacetal resin and a polyamide resin, you may form from other hard resin.

本発明の軸連結機構は、軸心周りの方向のスペーサとして二つの回転軸の間に配した一対の回転伝達部材を具備していればよいのであるが、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いてもよく、この場合、一方の連結基体は、基部と、この基部から軸方向に一体的に突出した突部とを具備しており、他方の連結基体は、基部と、この基部から軸方向に一体的に突出した突部とを具備しており、一方の連結基体の突部と他方の連結基体の突部とは、軸心周りの方向における一方の回転伝達部材の複数の突部の間の夫々に交互に配されていると共に当該一方の回転伝達部材の突部の間を規定する当該突部の軸心周りの方向における互いに対面する側面の夫々に軸心周りの方向における各側面で接触している。   The shaft coupling mechanism of the present invention is only required to have a pair of rotation transmission members disposed between two rotating shafts as a spacer in the direction around the axis, but is connected to one rotating shaft. And the other connecting base connected to the other rotating shaft. In this case, one connecting base has a base and a protrusion integrally protruding in the axial direction from the base. The other connecting base includes a base and a protrusion integrally protruding in the axial direction from the base, and the protrusion of one connecting base and the other connecting base The protrusions are alternately arranged between the plurality of protrusions of the one rotation transmission member in the direction around the axis, and define the gaps between the protrusions of the one rotation transmission member. In the direction around the axis on each of the sides facing each other in the direction around the axis We are in contact with each other at the side.

本発明の軸連結機構では、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、電磁ダンパのボールねじ又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。   In the shaft coupling mechanism of the present invention, one rotating shaft is coupled to the output rotating shaft of the electric motor, and the other rotating shaft is coupled to the ball screw of the electromagnetic damper or the steering shaft of the automobile. It may be like this.

本発明では、一方及び他方の回転伝達部材の少なくとも一方の基部は、中実の円柱状であってもよいが、好ましい例では、一方及び他方の回転伝達部材のうちの少なくとも一方の基部は、貫通孔を有して円筒状であり、両回転軸の互いに対峙する端部のうちの少なくとも一方は、その外周面で一方及び他方の回転伝達部材のうちの少なくとも一方の基部の貫通孔を規定する内周面に軸心周りの方向及び軸心方向において滑り移動自在に接触して当該貫通孔に挿入されている。   In the present invention, at least one base of one and the other rotation transmission member may be a solid columnar shape, but in a preferred example, at least one base of one and the other rotation transmission member is It is cylindrical with a through-hole, and at least one of the opposite ends of both rotating shafts defines a through-hole in at least one base of one of the rotation transmission members and the other of the rotation transmission members. The inner peripheral surface is inserted into the through hole so as to be slidably movable in the direction around the axial center and in the axial direction.

一方及び他方の連結基体の基部も、中実の円柱状であってもよいが、この場合には、両連結基体の各基部は、対応の回転軸に一体形成されていてもよく、他の好ましい例では、これら両連結基体の基部は、貫通孔を有して円筒状であり、両回転軸の互いに対峙する各端部は、その外周面で対応する連結基体の基部の貫通孔を規定する内周面に軸心周りの方向において当該対応する連結基体の基部に対して回転しないように嵌着されて当該基部の貫通孔に挿入されている。   The bases of the one and the other connection bases may also be solid cylindrical, but in this case, the bases of both connection bases may be formed integrally with the corresponding rotating shaft, In a preferred example, the base portions of both the connecting bases are cylindrical with through-holes, and the end portions of the rotating shafts facing each other define the corresponding through-holes of the bases of the connecting bases on the outer peripheral surface thereof. The inner peripheral surface is fitted so as not to rotate with respect to the base portion of the corresponding connecting base in the direction around the axis, and is inserted into the through hole of the base portion.

本発明によれば、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又はナットを介してピストンに連結されたボールねじ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又はピストンへの伝達を低減できるのみならず、異音(衝突音)の発生をなくし得、而して、耐久性に優れていると共に、自動車の電動式パワーステアリング装置に適用される場合には、操舵感覚を不快にさせない軸連結機構を提供することができる。   According to the present invention, even with long-term use, the rotating shaft connected to the output rotating shaft of one electric motor, for example, the output rotating shaft of the electric motor, and the steering shaft or the nut connected to the other rotating shaft, for example, the steering wheel are used. In addition, the backlash in the direction around the axis is not easily generated between the ball screw and the ball screw connected to the piston, and not only can the impact when the electric motor is reversed, the transmission of brush vibration to the steering wheel or piston can be reduced. A shaft coupling mechanism that can eliminate the generation of abnormal noise (collision noise), has excellent durability, and does not make the steering feeling uncomfortable when applied to an electric power steering device of an automobile. Can be provided.

本発明の好ましい一例の正面説明図である。It is front explanatory drawing of a preferable example of this invention. 図1に示す例の分解説明図である。FIG. 2 is an exploded explanatory diagram of the example shown in FIG. 1. 図1に示す一方の連結基体の右側面説明図である。It is right side explanatory drawing of one connection base | substrate shown in FIG. 図1に示す他方の連結基体の左側面説明図である。FIG. 4 is an explanatory diagram on the left side of the other connection base shown in FIG. 1. 図1に示す例のV−V線矢視説明図である。It is VV arrow explanatory drawing of the example shown in FIG. 図1に示す回転伝達体の側面説明図である。It is side surface explanatory drawing of the rotation transmission body shown in FIG. 図6に示す回転伝達体の正面説明図である。It is front explanatory drawing of the rotation transmission body shown in FIG. 図6に示す回転伝達体のVIII−VIII線矢視断面説明図である。It is a VIII-VIII arrow directional cross-sectional explanatory drawing of the rotation transmission body shown in FIG. 図7に示す回転伝達体のIX−IV線矢視断面説明図である。It is IX-IV arrow directional cross-sectional explanatory drawing of the rotation transmission body shown in FIG. 図9に示す一方の回転伝達部材の断面説明図である。FIG. 10 is a cross-sectional explanatory view of one rotation transmission member shown in FIG. 9. 図9に示す他方の回転伝達部材の右側面説明図である。It is right side explanatory drawing of the other rotation transmission member shown in FIG. 図6に示す回転伝達体のXII−XII線矢視断面説明図である。It is a XII-XII arrow directional cross-sectional explanatory drawing of the rotation transmission body shown in FIG. 図6に示す回転伝達体のXIII−XIII線矢視断面説明図である。It is XIII-XIII sectional view explanatory drawing of the rotation transmission body shown in FIG.

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13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、電動式パワーステアリング装置用であって、回転軸2に連結される連結基体3と、回転軸4に連結される連結基体5と、インサート成形されてなる一対の回転伝達部材6及び7を有した回転伝達体8とを具備しており、回転軸2又は4の軸心O周りの方向、即ち、R方向の回転を回転軸4又は2に伝達するように二つの回転軸2及び4の間に配されて二つの回転軸2及び4を連結するようになっている。   In FIG. 1 to FIG. 13, the shaft coupling mechanism 1 for the electric power steering apparatus of the present example is for the electric power steering apparatus, and is coupled to the coupling base 3 coupled to the rotating shaft 2 and to the rotating shaft 4. And a rotation transmission body 8 having a pair of rotation transmission members 6 and 7 formed by insert molding, and the direction around the axis O of the rotation shaft 2 or 4, that is, R It is arranged between the two rotating shafts 2 and 4 so as to transmit the rotation in the direction to the rotating shaft 4 or 2 so as to connect the two rotating shafts 2 and 4.

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、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、回転軸2のR方向の回転と共に連結基体3もR方向に回転されるようになっている。   The rotating shaft 2 is a rotating shaft on the electric motor side of the electric power steering device, and is connected to the output rotating shaft of the electric motor. It is designed to rotate in the direction.

剛性の連結基体3は、円筒状の基部11と、基部11の一方の環状面12から軸方向、即ちA方向に一体的に突出していると共にR方向において90°の等角度間隔をもって互いに離間されて配された截頭三角柱形状の四個の突部13と、A方向において回転軸4の端部15に対峙する回転軸2の端部14が嵌着された貫通孔16とを具備しており、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剛性の側面17及び18と、径方向内方先端に剛性の円弧状の頂面19とを有している。   The rigid connecting base 3 protrudes integrally from the cylindrical base 11 and one annular surface 12 of the base 11 in the axial direction, that is, the A direction, and is spaced apart from each other at an equal angular interval of 90 ° in the R direction. And four projections 13 in the shape of truncated triangular prisms, and a through hole 16 in which the end 14 of the rotary shaft 2 facing the end 15 of the rotary shaft 4 in the A direction is fitted. Each of the protrusions 13 has rigid side surfaces 17 and 18 as a pair of rigid rotation transmission surfaces in the R direction, and a rigid arcuate top surface 19 at the radially inner end.

回転軸4は、ステアリングホイールの操作(操舵)により回転されるようにステアリングホイールに連結された回転軸であり、回転軸4のR方向の回転と共に連結基体5もR方向に回転されるようになっている。   The rotating shaft 4 is a rotating shaft connected to the steering wheel so as to be rotated by operation (steering) of the steering wheel, and the connecting base 5 is also rotated in the R direction as the rotating shaft 4 rotates in the R direction. It has become.

剛性の連結基体5は、円筒状の基部21と、基部21の一方の環状面22からA方向に一体的に突出していると共にR方向において90°の等角度間隔をもって互いに離間されて配された截頭三角柱形状の四個の突部23と、A方向において回転軸2の端部14に対峙する回転軸4の端部15が嵌着された貫通孔26とを具備しており、突部23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剛性の側面27及び28と、径方向内方先端に剛性の円弧状の頂面29とを有している。   The rigid connection base 5 is integrally protruded from the cylindrical base portion 21 and one annular surface 22 of the base portion 21 in the A direction and spaced apart from each other at an equal angular interval of 90 ° in the R direction. And four protrusions 23 having a truncated triangular prism shape, and a through hole 26 into which the end 15 of the rotating shaft 4 facing the end 14 of the rotating shaft 2 in the A direction is fitted. Each of 23 has a rigid side surfaces 27 and 28 as a pair of rigid rotation transmission surfaces in the R direction, and a rigid arcuate top surface 29 at the radially inner end.

回転伝達体8において、ウレタンゴム、シリコーンゴム、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回転伝達部材6は、内周面31で貫通孔32を規定する円筒状の基部33と、R方向において45°の等角度間隔をもって互いに離間していると共に基部33の外周面34から一体的に径方向外方向に向かってR方向において幅Dをもって伸び、しかも、径方向外方向の先端部35で自由端となっている複数、本例では八個の突部36〜43とを有しており、突部36〜43の夫々は、R方向において平坦な側面47及び48を有しており、基部11の一方の環状面12に対面する突部36〜43の夫々のA方向の一方の平坦な端面49は、同じく基部11の一方の環状面12に対面する基部33のA方向の一方の平坦な端面50と面一となっており、基部21の一方の環状面22に対面する突部36〜43の夫々のA方向の他方の平坦な端面51は、同じく基部21の一方の環状面22に対面する基部33のA方向の他方の平坦な端面52と面一となっている。   In the rotation transmission body 8, the rotation transmission member 6 integrally formed from a rubber elastic body such as urethane rubber, silicone rubber, or polyester elastomer has a cylindrical base portion 33 that defines a through hole 32 on the inner peripheral surface 31, and R Are spaced apart from each other at equal angular intervals of 45 ° in the direction, and extend from the outer peripheral surface 34 of the base 33 integrally with the width D in the R direction toward the radially outer direction, and in addition, the distal end portion 35 in the radially outer direction. A plurality of free ends, in this example, eight protrusions 36 to 43, and each of the protrusions 36 to 43 has flat side surfaces 47 and 48 in the R direction. One flat end surface 49 in the A direction of each of the protrusions 36 to 43 facing the one annular surface 12 of the base portion 11 is also one of the base portions 33 facing the one annular surface 12 of the base portion 11 in the A direction. Flat The other flat end surface 51 in the A direction of each of the protrusions 36 to 43 facing the one annular surface 22 of the base 21 is the same as the one end surface 50 of the base 21. It is flush with the other flat end surface 52 in the A direction of the base portion 33 facing the surface.

回転伝達体8において、回転伝達部材6よりも大きな剛性を有するアルミを含む剛性金属又はポリアセタール樹脂、ポリアミド樹脂等の硬質樹脂から一体成形されてなる剛性の回転伝達部材7は、回転伝達部材6の基部33に埋設されていると共に内周面61で基部33の内周面31と協働して貫通孔32を規定する円筒状の基部62と、R方向において45°、135°、45°及び135°の角度間隔をもって互いに離間していると共に基部62の外周面63から一体的に径方向外方向に向かってR方向において幅Dよりも小さい幅dをもって伸びて回転伝達部材6の突部36、37、40及び41の夫々に埋設されており、しかも、径方向外方向の先端部64で自由端となっていると共に突部36〜43よりも少ない個数である四個の突部65〜68とを有しており、突部65と突部66と及び突部67と突部68とは夫々、45°の角度間隔をもって配されており、突部66と突部67と及び突部68と突部65とは夫々、135°の角度間隔をもって配されており、突部65〜68の夫々は、R方向において平坦な側面71及び72を有しており、基部21の環状面22側における基部62及び突部65〜68のA方向の一方の平坦な端面73及び74は互いに面一となっており、同じく基部11の環状面12側の基部62及び突部65〜68のA方向の他方の平坦な端面75及び76は互いに面一となっている。   In the rotation transmission body 8, a rigid rotation transmission member 7 integrally formed from a rigid metal including aluminum having higher rigidity than the rotation transmission member 6, or a hard resin such as a polyacetal resin or a polyamide resin is used as the rotation transmission member 6. A cylindrical base 62 which is embedded in the base 33 and defines the through hole 32 in cooperation with the inner peripheral surface 31 of the base 33 on the inner peripheral surface 61; and 45 °, 135 °, 45 ° in the R direction; The protrusions 36 of the rotation transmitting member 6 are spaced apart from each other at an angular interval of 135 ° and extend from the outer peripheral surface 63 of the base 62 integrally with the width d smaller than the width D in the radial direction toward the outer side. , 37, 40, and 41, and four protrusions that are free ends at the radially outer tip 64 and are smaller in number than the protrusions 36 to 43. 65 to 68, and the protrusion 65 and the protrusion 66, and the protrusion 67 and the protrusion 68 are arranged at an angular interval of 45 °, and the protrusion 66 and the protrusion 67 and Each of the protrusion 68 and the protrusion 65 is arranged with an angular interval of 135 °, and each of the protrusions 65 to 68 has side surfaces 71 and 72 that are flat in the R direction. One flat end surface 73 and 74 in the A direction of the base 62 and the protrusions 65 to 68 on the surface 22 side are flush with each other, and similarly, the base 62 and the protrusions 65 to 68 on the annular surface 12 side of the base 11. The other flat end faces 75 and 76 in the A direction are flush with each other.

こうして一対の回転伝達部材6及び7からなる回転伝達体8は、回転伝達部材7の貫通孔32を有した基部62の径方向における外周面63及びA方向の端面73及び75が当該基部62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る回転伝達部材6の貫通孔26を有した基部33により覆われていると共に回転伝達部材7の突部65〜68の夫々のR方向及びA方向における側面71及び72並びに端面74及び76が当該突部65〜68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る回転伝達部材6の対応の突部36、37、40及び41により覆われるようにして、また、回転伝達部材7の基部62の内周面61が回転伝達部材6の基部33に覆われることなしに、貫通孔32において露出すると共に回転伝達部材7の突部65〜68の夫々の先端部64の円弧面81が回転伝達部材6の突部36、37、40及び41の夫々に覆われることなしに、外部に露出するようにしてインサート成形されてなる。   In this way, the rotation transmission body 8 including the pair of rotation transmission members 6 and 7 has the outer peripheral surface 63 in the radial direction of the base portion 62 having the through hole 32 of the rotation transmission member 7 and the end surfaces 73 and 75 in the A direction of the base portion 62. Each of the protrusions 65 to 68 of the rotation transmission member 7 is covered with a base 33 having a through hole 26 of the rotation transmission member 6 which has a rigidity smaller than that of the rotation transmission member 6 and is elastically deformable. Side surfaces 71 and 72 and end surfaces 74 and 76 are covered with corresponding protrusions 36, 37, 40 and 41 of the rotation transmitting member 6 having a rigidity smaller than the rigidity of the protrusions 65 to 68 and elastically deformable. Thus, the inner peripheral surface 61 of the base 62 of the rotation transmitting member 7 is not covered by the base 33 of the rotation transmitting member 6 and is exposed in the through-hole 32 and the rotation transmission. The arcuate surface 81 of the tip 64 of each of the protrusions 65 to 68 of the member 7 is not covered with each of the protrusions 36, 37, 40 and 41 of the rotation transmitting member 6 and is exposed to the outside. Molded.

連結基体3の突部13と連結基体5の突部23とは、R方向における回転伝達部材6の突部36〜43の間の夫々に交互に配されていると共に回転伝達部材6の突部36〜43の間を規定する突部36〜43のR方向における互いに対面する側面47及び48の夫々にR方向における各側面17及び18並びに28及び27で接触しており、しかも、その夫々の円弧状の頂面19及び29で外周面34に接触して配されて、連結基体3及び5間に装着されている。すなわち、突部13と突部23とは、R方向における突部36〜43の間の夫々に交互に配されている。   The protrusions 13 of the connection base 3 and the protrusions 23 of the connection base 5 are alternately arranged between the protrusions 36 to 43 of the rotation transmission member 6 in the R direction, and the protrusions of the rotation transmission member 6. The side surfaces 47 and 48 facing each other in the R direction of the projections 36 to 43 that define between 36 to 43 are in contact with the side surfaces 17 and 18 and 28 and 27 in the R direction, respectively. Arc-shaped top surfaces 19 and 29 are arranged in contact with the outer peripheral surface 34 and are mounted between the connection bases 3 and 5. That is, the protrusions 13 and the protrusions 23 are alternately arranged between the protrusions 36 to 43 in the R direction.

両回転軸2及び4の互いに対峙する端部14及び15のうち一方の端部14は、その外周面85で回転伝達部材6及び7の基部33及び62の内周面31及び61に接触して貫通孔32に部分的に挿入されており、両回転軸2及び4の互いに対峙する端部14及び15のうち他方の端部15は、その外周面86で回転伝達部材6及び7の基部33及び62の内周面31及び61に接触して貫通孔32に部分的に挿入されており、端部14と端部15とは、両回転軸2及び4の相対的な揺動を許容するようにA方向において隙間をもって貫通孔32に部分的に挿入されている。   One end 14 of the ends 14 and 15 of the rotating shafts 2 and 4 facing each other contacts the inner peripheral surfaces 31 and 61 of the base portions 33 and 62 of the rotation transmitting members 6 and 7 at the outer peripheral surface 85. The other end 15 of the end portions 14 and 15 of the two rotating shafts 2 and 4 facing each other is a base portion of the rotation transmitting members 6 and 7 on the outer peripheral surface 86 thereof. It is inserted into the through-hole 32 in contact with the inner peripheral surfaces 31 and 61 of 33 and 62, and the end portion 14 and the end portion 15 allow relative swinging of both rotary shafts 2 and 4. As shown, it is partially inserted into the through hole 32 with a gap in the A direction.

回転軸2のR方向の回転を回転軸4に伝達するように回転軸2及び回転軸4の間に配されて二つの回転軸である回転軸2及び回転軸4を相互に連結する軸連結機構1を具備した以上の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、回転軸4がR方向に回転されて、回転軸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36〜43のR方向の弾性変形後における突部36〜43を介する突部13による突部65〜68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23に伝達されて、これにより回転軸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。   A shaft connection that is arranged between the rotary shaft 2 and the rotary shaft 4 so as to transmit the rotation of the rotary shaft 2 in the R direction to the rotary shaft 4 and connects the rotary shaft 2 and the rotary shaft 4 as two rotary shafts to each other. In the above-described electric power steering apparatus including the mechanism 1, when the steering wheel is manually operated by the driver, the rotation shaft 4 is rotated in the R direction, and the rotation of the rotation shaft 4 in the R direction is a gear (not shown). Is transmitted as a reciprocating motion to a drag link or the like via a transmission mechanism such as a steering force to a steering wheel (wheel). 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 After the elastic deformation of the protrusions 36 to 43 in the R direction by the portion 13, the rotation of the connecting base body 3 in the R direction is performed by pressing the protrusions 65 to 68 in the R direction by the protrusion 13 via the protrusions 36 to 43. This is transmitted to the projecting portion 23 of the connecting base 5, thereby adding the rotational force in the R direction of the rotating shaft 2 to the rotational force in the R direction of the rotating shaft 4 to assist the driver in manual operation of the steering wheel. It is like that.

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回転軸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回転軸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、回転軸4に対する回転軸2のR方向の相対回転が幅Dと幅dとの差の半分よりも十分に微小なものである場合には、突部36〜43が容易に圧縮変形する結果、斯かる回転軸2の微小なR方向の相対回転は回転軸4には殆ど伝達されず、而して、軸連結機構1及び回転軸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36〜43の一定以上の圧縮変形後、突部36〜43を介する突部13による突部65〜68のR方向への押圧で突部38、39、42及び43のそれ以上の圧縮変形を抑止できる結果、突部38、39、42及び43の夫々のクリープによるへたりを防止でき、突部13及び23の側面17及び18並びに28及び27と突部36〜43の側面47及び48とのR方向における互いの接触を長期に亘って維持でき、回転軸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。   In the shaft coupling mechanism 1, either the state where the steering wheel is not manually operated by the driver and the rotating shaft 4 is not rotated in the R direction or the state where the steering wheel is manually operated by the driver and the rotating shaft 4 is rotated in the R direction. Even in this state, when the relative rotation in the R direction of the rotary shaft 2 with respect to the rotary shaft 4 is sufficiently smaller than half of the difference between the width D and the width d, the protrusions 36 to 43 can be easily formed. As a result of the compressive deformation, the relative rotation in the R direction of the rotating shaft 2 is hardly transmitted to the rotating shaft 4, and thus the impact when the electric motor is reversed via the shaft coupling mechanism 1 and the rotating shaft 4. Further, it is possible to reduce the transmission of brush vibration to the steering wheel so as not to make the steering feeling uncomfortable, and after a certain amount of compression deformation of the protrusions 36 to 43, the protrusions by the protrusions 13 through the protrusions 36 to 43 65 As a result of pressing the protrusions 38, 39, 42, and 43 in the R direction, the compression deformation of the protrusions 38, 39, 42, and 43 can be suppressed. As a result, the protrusions 38, 39, 42, and 43 can be prevented from dripping due to creep. The side surfaces 17 and 18 and 28 and 27 of the 13 and 23 and the side surfaces 47 and 48 of the protrusions 36 to 43 can be maintained in contact with each other in the R direction over a long period of time, and between the rotary shaft 4 and the rotary shaft 2. The play in the R direction is unlikely to occur.

そして、回転伝達部材6は、ステアリングホイールの運転者による手動操作で回転軸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方向に回転されて回転軸4に対して回転軸2が一定以上、すなわち幅Dと幅dとの差の半分に近づく程度にR方向に相対回転されようとする場合には、突部36〜43を介する突部13による突部65〜68のR方向への押圧でもって斯かる程度のR方向の相対回転に応答して回転軸2のR方向の回転を回転軸4に伝達して回転軸4の回転を補助するようになる。   The rotation transmission member 6 is rotated with respect to the rotation shaft 4 by rotating the rotation shaft 4 in the R direction by the manual operation by the driver of the steering wheel and rotating the rotation shaft 2 in the R direction by the operation of the electric motor. When the shaft 2 is to be rotated relative to the R direction to a certain extent, that is, close to half the difference between the width D and the width d, the protrusions 65 to 68 formed by the protrusions 13 through the protrusions 36 to 43. In response to such relative rotation in the R direction, the rotation of the rotating shaft 2 in the R direction is transmitted to the rotating shaft 4 in response to such a relative rotation in the R direction to assist the rotation of the rotating shaft 4.

以上のように軸連結機構1によれば、回転軸2又は4の回転の回転軸4又は2への伝達が回転伝達部材6の突部36〜43の弾性変形を介して行われるために、回転軸2又は4の微小なR方向の回転の回転軸4又は2への伝達を回転伝達部材6の突部36〜43の弾性変形で低減又は阻止できると共に回転軸2又は4に対する大きな相対回転の回転軸4又は2への伝達を回転伝達部材6の突部36〜43よりも大きな剛性を有している回転伝達部材7の突部65〜68を介して行い得、しかも、回転伝達部材6の突部36〜43におけるR方向の一定以上の弾性変形では大きい剛性をもった回転伝達部材7の突部65〜68で回転伝達部材6の突部38、39、42及び43の大きな変形を阻止できるために、柔軟性のある剛性の小さい樹脂材料を回転伝達部材6に対して用いてもクリープによる回転伝達部材6の永久的な変形を低減でき、その上、回転伝達部材7の突部65〜68の側面71及び72は、当該突部65〜68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る回転伝達部材6の対応の突部36、37、40及び41により覆われているために、回転伝達部材7の突部65〜68の側面71及び72への連結基体3及び5の突部13及び23の直接的な衝突を回避でき、而して、長期の使用によっても例えば電動モータの出力回転軸に連結された回転軸2と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R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るのみならず、異音(衝突音)の発生をなくし得て、耐久性に優れ操舵感覚を不快にさせないようにできる。   As described above, according to the shaft coupling mechanism 1, since the rotation of the rotation shaft 2 or 4 is transmitted to the rotation shaft 4 or 2 through the elastic deformation of the protrusions 36 to 43 of the rotation transmission member 6, Transmission of minute rotation in the R direction of the rotating shaft 2 or 4 to the rotating shaft 4 or 2 can be reduced or prevented by elastic deformation of the protrusions 36 to 43 of the rotation transmitting member 6 and large relative rotation with respect to the rotating shaft 2 or 4 Can be transmitted to the rotation shaft 4 or 2 via the protrusions 65 to 68 of the rotation transmission member 7 having rigidity higher than that of the protrusions 36 to 43 of the rotation transmission member 6, and the rotation transmission member. 6 of the protrusions 36 to 43 of the rotation 6 are large deformations of the protrusions 38, 39, 42 and 43 of the rotation transmitting member 6 by the protrusions 65 to 68 of the rotation transmitting member 7 having a large rigidity in the elastic deformation of a certain level or more in the R direction. Flexible resin with low rigidity Even if a material is used for the rotation transmission member 6, permanent deformation of the rotation transmission member 6 due to creep can be reduced. In addition, the side surfaces 71 and 72 of the protrusions 65 to 68 of the rotation transmission member 7 are The projections 65 to 65 of the rotation transmission member 7 are covered with the corresponding projections 36, 37, 40 and 41 of the rotation transmission member 6 having rigidity smaller than that of 65 to 68 and elastically deformable. A direct collision of the projections 13 and 23 of the coupling bases 3 and 5 with the side surfaces 71 and 72 of the 68 can be avoided, and therefore the rotary shaft connected to the output rotary shaft of the electric motor, for example, even after long-term use. 2 and, for example, the rattling in the R direction is unlikely to occur between the steering shaft connected to the steering wheel, and it is possible to reduce the impact when the electric motor is reversed and the transmission of brush vibration to the steering wheel. Minara not a, is obtained eliminating the generation of noise (collision sound), can so as not to discomfort the excellent steering feeling durability.

また、軸連結機構1によれば、突部13及び23の円弧状の頂面19及び29が弾性変形可能な基部33の外周面34に接触しているために、回転軸2又は4の偏心を許容して、回転軸2又は4の偏心においても回転軸2又は4の回転の回転軸4又は2への伝達を所望に行うことができる。   Further, according to the shaft coupling mechanism 1, the arcuate top surfaces 19 and 29 of the protrusions 13 and 23 are in contact with the outer peripheral surface 34 of the base portion 33 that can be elastically deformed. Therefore, even when the rotary shaft 2 or 4 is eccentric, the rotation of the rotary shaft 2 or 4 can be transmitted to the rotary shaft 4 or 2 as desired.

上記の例は、電動式パワーステアリング装置用の軸連結機構1であるが、本発明は、斯かる軸連結機構1に限定されず、電磁ダンパにおける電動モータの出力回転軸とボールねじとを連結する軸連結機構等にも適用することができる。   The above example is a shaft coupling mechanism 1 for an electric power steering apparatus, but the present invention is not limited to such a shaft coupling mechanism 1 and connects an output rotation shaft of an electric motor and a ball screw in an electromagnetic damper. The present invention can also be applied to a shaft coupling mechanism or the like.

1 軸連結機構
2 回転軸
3 連結基体
4 回転軸
5 連結基体
6、7 回転伝達部材
8 回転伝達体
11、21 基部
12、22 環状面
13、23、36〜43、65〜68 突部
14、15 端部
16、26、32 貫通孔
17、18、27、28、47、48 側面
19、29 頂面
31 内周面
33、62 円筒状基部
34、63 外周面
35、64 先端部
49〜52、73〜76 端面
DESCRIPTION OF SYMBOLS 1 Axis connection mechanism 2 Rotating shaft 3 Connecting base 4 Rotating shaft 5 Connecting base 6, 7 Rotation transmission member 8 Rotation transmission body 11, 21 Base 12, 22 Annular surface 13, 23, 36-43, 65-68 Projection 14, 15 End portion 16, 26, 32 Through hole 17, 18, 27, 28, 47, 48 Side surface 19, 29 Top surface 31 Inner peripheral surface 33, 62 Cylindrical base 34, 63 Outer peripheral surface 35, 64 Tip 49-52 73-76 End face

Claims (7)

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を含む回転伝達体を具備しており、回転伝達体の一方の回転伝達部材は、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基部の外周面から一体的に径方向外方向に向かって伸びた複数の突部とを有しており、回転伝達体の他方の回転伝達部材は、一方の回転伝達部材の基部に埋設されている基部と、軸心周りの方向において互いに離間していると共に当該他方の回転伝達部材の基部の外周面から一体的に径方向外方向に向かって伸びて一方の回転伝達部材の突部に埋設されている突部とを有しており、一対の回転伝達部材は、他方の回転伝達部材の基部の少なくとも径方向における外周面が当該基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る一方の回転伝達部材の基部により覆われていると共に他方の回転伝達部材の突部の少なくとも軸心周りの方向及び軸方向における側面が当該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る一方の回転伝達部材の対応の突部により覆われるようにして、インサート成形されてなる軸連結機構。   A shaft coupling mechanism that is arranged between two rotary shafts to connect the two rotary shafts so as to transmit the rotation of one rotary shaft to the other rotary shaft, and includes a pair of rotation transmission members. And a plurality of rotation transmission members of the rotation transmission body are spaced apart from each other in the direction around the base and extending radially outward from the outer peripheral surface of the base. The other rotation transmission member of the rotation transmission body is spaced apart from the base portion embedded in the base portion of the one rotation transmission member and the other in the direction around the axis. The rotation transmission member has a protrusion integrally extending radially outward from the outer peripheral surface of the base portion and embedded in the protrusion of one rotation transmission member. , At least in the radial direction of the base of the other rotation transmission member The outer peripheral surface has a rigidity smaller than the rigidity of the base and is covered with the base of one rotation transmission member that is elastically deformable, and at least the direction around the axial center and the axial direction of the projection of the other rotation transmission member The shaft coupling mechanism is formed by insert molding such that the side surface of the shaft is covered with a corresponding protrusion of one rotation transmission member having rigidity smaller than that of the protrusion and elastically deformable. 一方の回転伝達部材は、他方の回転伝達部材の突部の個数よりも多い個数の突部を有している請求項1に記載の軸連結機構。   The shaft coupling mechanism according to claim 1, wherein one rotation transmission member has a larger number of protrusions than the number of protrusions of the other rotation transmission member. 一対の回転伝達部材の突部の夫々は、径方向外方向の先端部で自由端となっている請求項1又は2に記載の軸連結機構。   3. The shaft coupling mechanism according to claim 1, wherein each of the protrusions of the pair of rotation transmitting members is a free end at a distal end portion in a radially outward direction. 一方の回転伝達部材の基部及び突部は、ウレタンゴム、シリコーンゴム、ポリエステルエラストマー等のゴム弾性体からなっており、他方の回転伝達部材の基部及び突部は、アルミを含む剛性金属又はポリアセタール樹脂、ポリアミド樹脂等の硬質樹脂から一体成形されてなる請求項1から3のいずれか一項に記載の軸連結機構。   The base and protrusion of one rotation transmission member are made of a rubber elastic body such as urethane rubber, silicone rubber, and polyester elastomer, and the base and protrusion of the other rotation transmission member are rigid metal or polyacetal resin containing aluminum. The shaft coupling mechanism according to any one of claims 1 to 3, wherein the shaft coupling mechanism is integrally molded from a hard resin such as a polyamide resin. 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、一方の連結基体は、基部と、この基部から軸方向に一体的に突出した突部とを具備しており、他方の連結基体は、基部と、この基部から軸方向に一体的に突出した突部とを具備しており、一方の連結基体の突部と他方の連結基体の突部とは、軸心周りの方向における一方の回転伝達部材の複数の突部の間の夫々に交互に配されていると共に当該一方の回転伝達部材の突部の間を規定する当該突部の軸心周りの方向における互いに対面する側面の夫々に軸心周りの方向における各側面で接触している請求項1から4のいずれか一項に記載の軸連結機構。   One connecting base connected to one rotating shaft and the other connecting base connected to the other rotating shaft are provided. One connecting base is integrated with a base portion in the axial direction from the base portion. And the other connecting base includes a base and a protrusion integrally protruding in the axial direction from the base, and the protrusion of one connecting base and the other The protrusions of the connecting base are alternately arranged between the plurality of protrusions of one rotation transmission member in the direction around the axis and define between the protrusions of the one rotation transmission member. 5. The shaft coupling mechanism according to claim 1, wherein each of the side surfaces facing each other in the direction around the axis of the protruding portion is in contact with each side surface in the direction around the axis. 6. 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る請求項1から5のいずれか一項に記載の軸連結機構。   6. One of the rotating shafts is connected to an output rotating shaft of an electric motor, and the other rotating shaft is connected to a steering shaft of an automobile. The shaft coupling mechanism according to item. 一方及び他方の回転伝達部材のうちの少なくとも一方の基部は、貫通孔を有して円筒状であり、両回転軸の互いに対峙する端部のうちの少なくとも一方は、その外周面で一方及び他方の回転伝達部材のうちの少なくとも一方の基部の貫通孔を規定する内周面に軸心周りの方向及び軸心方向において滑り移動自在に接触して当該貫通孔に挿入されている請求項1から6のいずれか一項に記載の軸連結機構。   At least one base part of the one and the other rotation transmission members has a through hole and is cylindrical, and at least one of the opposing ends of the two rotation shafts is the outer peripheral surface of the one and the other. From the rotation transmitting member, the inner peripheral surface defining the through hole of at least one base is slidably contacted in the direction around the axial center and in the axial direction, and is inserted into the through hole. The shaft coupling mechanism according to claim 6.
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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2013118360A1 (en) 2012-02-07 2013-08-15 オイレス工業株式会社 Rotation transmitting member, coupling directly connected to shafts, and shaft connecting mechanism
WO2018180282A1 (en) * 2017-03-30 2018-10-04 Kyb株式会社 Electric power steering device and shaft coupler used for same
CN108644336A (en) * 2018-05-29 2018-10-12 清华大学 Flexible gearing

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2005319922A (en) * 2004-05-10 2005-11-17 Koyo Seiko Co Ltd Power steering device
JP2010007713A (en) * 2008-06-25 2010-01-14 Nsk Ltd Elastic shaft coupling and electric power steering device

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2005319922A (en) * 2004-05-10 2005-11-17 Koyo Seiko Co Ltd Power steering device
JP2010007713A (en) * 2008-06-25 2010-01-14 Nsk Ltd Elastic shaft coupling and electric power steering device

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2013118360A1 (en) 2012-02-07 2013-08-15 オイレス工業株式会社 Rotation transmitting member, coupling directly connected to shafts, and shaft connecting mechanism
US9334903B2 (en) 2012-02-07 2016-05-10 Oiles Corporation Rotation transmitting member, coupling directly connected to shafts, and shaft connecting mechanism
WO2018180282A1 (en) * 2017-03-30 2018-10-04 Kyb株式会社 Electric power steering device and shaft coupler used for same
CN108644336A (en) * 2018-05-29 2018-10-12 清华大学 Flexible gearing

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