【０００１】
【発明の属する技術分野】
本発明は、動力伝達機構に関するものである。
【０００２】
【従来の技術】
本願出願人は、特許文献１において、第１凹部を内周縁に有する円環状の第１回転体と、入口部が狭幅の第２凹部を外周縁に有し第１回転体に内嵌合する円板状の第２回転体と、第１凹部と第２凹部の入口部とに当接可能な弾性部材とを備え、トルク伝達時には弾性部材が第１凹部と第２凹部の入口部とに当接して第１回転体と第２回転体との相対回転を阻止し、トルク遮断時には弾性部材が第１凹部に押されて弾性変形し、前記狭幅の入口部を通って第２凹部へ進入し、第１凹部から離脱して第１回転体と第２回転体との相対回転を許容する動力伝達機構を提案した。
特許文献１の動力伝達機構によれば、第１回転体から第２回転体への伝達トルクが所定値を超えると、第１回転体から第２回転体へのトルク伝達が遮断され、駆動源、駆動源と第１回転体とを接続する接続部材等の損傷が防止される。
【０００３】
【特許文献１】特開平１０−３１１３９１号
【０００４】
【発明が解決しようとする課題】
本発明は特許文献１の動力伝達機構に更に有為な機能を追加した動力伝達機構を提供することを目的とする。
【０００５】
【課題を解決するための手段】
上記課題を解決するために、本発明においては、第１凹部を内周縁に有する円環状の第１回転体と、入口部が狭幅の第２凹部を外周縁に有し第１回転体に内嵌合する円板状の第２回転体と、第１凹部と第２凹部の入口部とに当接可能な弾性部材とを備え、トルク伝達時には弾性部材が第１凹部と第２凹部の入口部とに当接して第１回転体と第２回転体との相対回転を阻止し、トルク遮断時には弾性部材が第１凹部に押されて弾性変形し、前記狭幅の入口部を通って第２凹部へ進入し、第１凹部から離脱して第１回転体と第２回転体との相対回転を許容する動力伝達機構であって、弾性部材が制振機能を有することを特徴とする動力伝達機構を提供する。
また本発明においては、入口部が狭幅の第１凹部を内周縁に有する円環状の第１回転体と、第２凹部を外周縁に有し第１回転体に内嵌合する円板状の第２回転体と、第１凹部の入口部と第２凹部とに当接可能な弾性部材とを備え、トルク伝達時には弾性部材が第１凹部の入口部と第２凹部とに当接して第１回転体と第２回転体との相対回転を阻止し、トルク遮断時には弾性部材が第２凹部に押されて弾性変形し、前記狭幅の入口部を通って第１凹部へ進入し、第２凹部から離脱して第１回転体と第２回転体との相対回転を許容する動力伝達機構であって、弾性部材が制振機能を有することを特徴とする動力伝達機構を提供する。
本発明に係る動力伝達機構においては、弾性部材が制振機能を有することにより、第１回転体が接続される駆動源の短周期トルク変動、第２回転体が接続される回転機器の短周期トルク変動による、前記回転機器の主軸の捩じり振動が抑制される。
【０００６】
本発明の好ましい態様においては、弾性部材は粘弾性素材単体又は弾性素材単体と粘弾性素材単体のクラッド材で構成されている。
粘弾性素材単体又は弾性素材単体と粘弾性素材単体のクラッド材で構成された弾性部材は制振機能を有する。
【０００７】
本発明においては、第１凹部を内周縁に有する円環状の第１回転体と、入口部が狭幅の第２凹部を外周縁に有し第１回転体に内嵌合する円板状の第２回転体と、第１凹部と第２凹部の入口部とに当接可能な弾性部材とを備え、トルク伝達時には弾性部材が第１凹部と第２凹部の入口部とに当接して第１回転体と第２回転体との相対回転を阻止し、トルク遮断時には弾性部材が第１凹部に押されて弾性変形し、前記狭幅の入口部を通って第２凹部へ進入し、第１凹部から離脱して第１回転体と第２回転体との相対回転を許容する動力伝達機構であって、弾性部材が自転阻止部を有することを特徴とする動力伝達機構を提供する。
また本発明においては、入口部が狭幅の第１凹部を内周縁に有する円環状の第１回転体と、第２凹部を外周縁に有し第１回転体に内嵌合する円板状の第２回転体と、第１凹部の入口部と第２凹部とに当接可能な弾性部材とを備え、トルク伝達時には弾性部材が第１凹部の入口部と第２凹部とに当接して第１回転体と第２回転体との相対回転を阻止し、トルク遮断時には弾性部材が第２凹部に押されて弾性変形し、前記狭幅の入口部を通って第１凹部へ進入し、第２凹部から離脱して第１回転体と第２回転体との相対回転を許容する動力伝達機構であって、弾性部材が自転阻止部を有することを特徴とする動力伝達機構を提供する。
本発明に係る動力伝達機構においては、弾性部材が自転阻止部を有しているので、遮断トルク値が安定する。
【０００８】
本発明の好ましい態様においては、弾性部材は環状部材又は一部が切り欠かれた環状部材である。
本発明の好ましい態様においては、弾性部材は一部が切り欠かれた環状部材であり、切欠部に対峙する部位が他部に比べて肉厚に形成されている。
環状部材又は一部が切り欠かれた環状部材は弾性変形により縮径するので、第２凹部の狭幅の入口或いは第１凹部の狭幅の入口を容易に通り抜けることができる。
一部が切り欠かれた弾性部材は切り欠き部の隙間が狭まるように弾性変形するので、切り欠き部に対峙する部位を他部に比べて肉厚に形成し、当該部位の曲げ応力を緩和するのが望ましい。
【０００９】
本発明の好ましい態様においては、動力伝達機構は、弾性部材の抜け落ちを防止する抜け落ち防止機構を備える。
動力伝達機構の組立時に、弾性部材が第２凹部入口部又は第１凹部入口部から抜け落ちる事態の発生が防止される。
【００１０】
本発明の好ましい態様においては、弾性部材と第１凹部、第２凹部との当接部が潤滑されている。
本発明の好ましい態様においては、弾性部材は自己潤滑性を有している。
弾性部材と第１凹部、第２凹部との当接部の摩耗が抑制され、遮断トルク値が安定する。
【００１１】
本発明の好ましい態様においては、弾性部材と第１凹部、第２凹部との当接部が潤滑されている。
本発明の好ましい態様においては、弾性部材は自己潤滑性を有している。
弾性部材と第１凹部、第２凹部との当接部の摩耗が抑制され、遮断トルク値が安定する。
【００１２】
【発明の実施の形態】
本発明の実施例に係る動力伝達機構を説明する。
図１に示すように、動力伝達機構１は、円環状の第１回転体２を備えている。第１回転体２は、ベアリングαを介して図示しない圧縮機のケーシングにより支持されている。第１回転体２は図示しない無端ベルトを介して図示しない車両エンジンに接続されている。浅い円弧状の第１凹部２ａが、周方向に互いに所定間隔を隔てて、第１回転体２の内周縁に３個形成されている。
動力伝達機構１は、微少隙間を隔てて第１回転体２に嵌合する円板状の第２回転体３を備えている。狭幅の入口部３ａ′を有する略円形の第２凹部３ａが、第１回転体２の第１凹部２ａに対峙して、第２回転体３の外周縁に３個形成されている。第２回転体３と同心に延在する図示しない圧縮機の主軸が、第２回転体３に固定されている。
一部が切り欠かれた円環状の弾性部材４が、切り欠き部４ａを径方向外方へ差し向けて、第１凹部２ａと第２凹部の入口部３ａ′とに当接し、第１凹部２ａと第２凹部の入口部３ａ′とにより保持されている。弾性部材４の半分に満たない一部が第１凹部２ａ内に在り、半分を超える残余部が入口部３ａ′を含む第２凹部３ａ内に在る。
第１凹部２ａの曲率半径は、弾性部材４の前記半分に満たない一部の曲率半径よりも大きな値に設定されている。
図２に示すように、弾性部材４は、金属、樹脂、ゴム等の弾性素材から成る弾性部４ｂと、ゴムに粘着付与剤、軟化剤等を添加した素材等の粘弾性素材からなる粘弾性部４ｃとのクラッド材で構成された制振部材である。
【００１３】
動力伝達機構１の作動を説明する。
図示しない無端ベルトを介して図示しない車両エンジンから第１回転体２にトルクが伝達される。弾性部材４が、第１回転体２の第１凹部２ａと第２回転体３の第２凹部入口部３ａ′とに当接して、第１回転体２と第２回転体３との相対回転を阻止する。第１凹部２ａと弾性部材４との当接部と、弾性部材４と第２凹部入口部３ａ′との当接部とを介して、第１回転体２から第２回転体３へトルクが伝達される。第２回転体３から図示しない圧縮機の主軸へトルクが伝達され、図示しない圧縮機が稼動する。
第１回転体２と第２回転体３との間の伝達トルクが増加するのに伴って、第１凹部２ａが弾性部材４に対して周方向へ相対移動し、弾性部材４を径方向内方へ押圧して弾性変形させる。弾性部材４は、切り欠き部４ａの隙間が狭まるように変形して縮径する。第１回転体２と第２回転体３との間の伝達トルクが所定値を超えると、縮径変形した弾性部材４は、狭幅の第２凹部入口３ａ′を通って第２凹部３ａ内へ進入し、第１凹部２ａから離脱し、第１回転体２と第２回転体３との相対回転を許容する。第１回転体２と第２回転体３との間のトルク伝達が遮断される。
この結果、摺動部の焼き付き等により図示しない圧縮機が緊急停止した場合に、車両エンジン、車両エンジンと動力伝達機構１とを接続する無端ベルト等に過大な力が働き、これらの機器が損傷する事態の発生が防止される。
第１凹部２ａから離脱した弾性部材４は、第２凹部３ａにより保持される。弾性部材４が高速回転する動力伝達機構１から飛散して、近傍の機器が損傷する事態の発生が防止される。
【００１４】
第１凹部２ａの曲率半径は、弾性部材４の前記半分に満たない一部の曲率半径よりも大きいので、第１回転体２と第２回転体３との間でトルクが伝達されている時に、第１凹部２ａは弾性部材４に対して支障なく周方向へ相対移動できる。従って、動力伝達機構１は、第１回転体２と第２回転体３との間の伝達トルクが所定値を超えた時に、第１回転体２と第２回転体３との間のトルク伝達を確実に遮断できる。
【００１５】
車両エンジンの短周期トルク変動や圧縮機の短周期トルク変動が、制振機能を有する弾性部材４により吸収され、動力伝達機構１に接続された圧縮機の主軸の捩じり振動が抑制される。
弾性部材４を粘弾性素材単体により構成しても良い。
【００１６】
一部が切り欠かれた円環状の弾性部材４は弾性変形により縮径するので、狭幅の第２凹部入口３ａ′を容易に通り抜けることができる。
図３に示すように、弾性部４ｂと粘弾性部４ｃとを有し、且つ切り欠きを有さない円板状又は円環状の弾性部材４を使用しても良い。弾性変形により縮径し、狭幅の第２凹部入口３ａ′を容易に通り抜けることができる。
【００１７】
図４に示すように、弾性部材４に突起４ｄ、４ｅを形成して第２凹部３ａに係合させ、或いは第２凹部入口部３ａ′を平坦面とし弾性部材４の第２凹部入口部３ａ′との当接部４ｆも平坦面として、弾性部材４の自転を防止しても良い。
切り欠きを有する弾性部材４が自転すると、第１凹部２ａから印加される押圧力による弾性部材４の変形態様が変化し、第２凹部入口部３ａ′の通過の難易度が変化して、遮断トルク値が変化する。弾性部材４の自転を阻止することにより、遮断トルク値が安定する。切り欠きを有する弾性部材に限らず、第１凹部２ａから印加される押圧力による変形態様が自転によって変化する弾性部材を使用する際には、当該弾性部材の自転を阻止するのが望ましい。
【００１８】
図５に示すように、弾性部材４の切り欠き部４ａに対峙する部位４ｇを他部に比べて肉厚に形成しても良い。
弾性部材４は切り欠き部４ａの隙間が狭まるように縮小弾性変形するので、切り欠き部４ａに対峙する部位４ｇを他部に比べて肉厚に形成し、部位４ｇの曲げ応力を緩和するのが望ましい。
【００１９】
図６に示すように、第２凹部入口部３ａ′に括れ３ａ″を形成し、弾性部材４の入口部３ａ′との当接部にも括れ４ｈを形成しても良い。
動力伝達機構１の組立時に、弾性部材１が第２凹部入口部３ａ′から抜け落ちる事態の発生が防止される。
【００２０】
弾性部材４を、楕円形、多角形等の任意外形の環状に形成しても良い。
第１凹部２ａ、第２凹部３ａ、弾性部材４の数は、３に限定されない。複数の弾性部材４を配設すると、個々の弾性部材４に印加される外力が減少し、弾性部材４の小型化が可能となり、ひいては動力伝達機構の小型化が可能となる。従って、第１凹部２ａ、第２凹部３ａ、弾性部材４の数は複数であるのが望ましい。
弾性部材４と第１凹部２ａ、第２凹部入口部３ａ′との当接部を潤滑しても良い。弾性部材４に自己潤滑性を持たせても良い。弾性部材４と第１凹部２ａ、第２凹部入口３ａ′との当接部の摩耗が抑制され、遮断トルク値が安定する。
第２凹部入口３ａ′の対峙する壁面は、一対の曲面でも良く、平行に延在する一対の平坦面でも良く、径方向外側へ向けて八の字状に隙間が広がる一対の平坦な斜面でも良い。
第１凹部２ａを深く形成すると共に入口部を狭幅に形成し、第２凹部３ａを浅く形成し且つ曲率半径を弾性部材４の第２凹部３ａに在る部分の曲率半径よりも大きく設定し、弾性部材４を第２凹部３ａと第１凹部２ａの入口部とに当接させ、第２凹部３ａと第１凹部２ａの入口部とで弾性部材４を保持しても良い。弾性部材４が第２凹部３ａと第１凹部２ａの入口部とに当接することにより、第１回転体２から第２回転体３へトルクが伝達され、弾性部材４が第２凹部により押圧され、狭幅の入口部を通って第１凹部に進入し、第２凹部から離脱することにより、第１回転体２から第２回転体３へのトルク伝達が遮断される。
【００２１】
【発明の効果】
以上説明したごとく、本発明に係る動力伝達機構においては、弾性部材が制振機能を有することにより、第１回転体が接続される駆動源の短周期トルク変動、第２回転体が接続される回転機器の短周期トルク変動による、前記回転機器の主軸の捩じり振動が抑制される。
【図面の簡単な説明】
【図１】本発明の実施例に係る動力伝達機構の斜視図である。
【図２】弾性部材の変形例の平面図である。
【図３】弾性部材の変形例の平面図である。
【図４】弾性部材の変形例の平面図である。
【図５】弾性部材の変形例の平面図である。
【図６】弾性部材の変形例の平面図である。
【符号の説明】
１ 動力伝達機構
２ 第１回転体
２ａ 第１凹部
３ 第２回転体
３ａ 第２凹部
３ａ′ 入口部
４ 弾性部材
４ｂ 弾性部
４ｃ 粘弾性部
４ｄ、４ｅ 突起
４ｆ 当接部[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a power transmission mechanism.
[0002]
[Prior art]
In Patent Document 1, the applicant of the present application discloses an annular first rotating body having a first concave portion on an inner peripheral edge, and an inner fitting with the first rotating body having a second concave portion having a narrow inlet portion on an outer peripheral edge. And a resilient member capable of contacting the first concave portion and the entrance portion of the second concave portion. When the torque is transmitted, the elastic member is provided between the first concave portion and the entrance portion of the second concave portion. To prevent relative rotation between the first rotating body and the second rotating body, and when torque is interrupted, the elastic member is pushed by the first recess to be elastically deformed, and passes through the narrow-width inlet portion so as to pass through the second recess. And a power transmission mechanism that allows relative rotation between the first rotating body and the second rotating body by entering the first recessed part and separating from the first recessed part.
According to the power transmission mechanism of Patent Document 1, when the transmission torque from the first rotating body to the second rotating body exceeds a predetermined value, the torque transmission from the first rotating body to the second rotating body is interrupted, and the driving source In addition, damage to a connecting member for connecting the driving source and the first rotating body is prevented.
[0003]
[Patent Document 1] Japanese Patent Application Laid-Open No. H10-31391
[Problems to be solved by the invention]
An object of the present invention is to provide a power transmission mechanism in which a more significant function is added to the power transmission mechanism of Patent Document 1.
[0005]
[Means for Solving the Problems]
In order to solve the above-mentioned problems, in the present invention, an annular first rotating body having a first concave portion on an inner peripheral edge and a first rotating body having a narrow second concave portion on an outer peripheral edge having an inlet portion are provided. A disk-shaped second rotating body fitted inside; and an elastic member capable of abutting on an inlet of the first concave portion and the second concave portion, wherein the elastic member is provided between the first concave portion and the second concave portion during torque transmission. The first rotating body and the second rotating body are prevented from rotating relative to each other by coming into contact with the inlet, and when the torque is cut off, the elastic member is pushed by the first recess to be elastically deformed and passes through the narrow inlet. A power transmission mechanism that enters the second recess, separates from the first recess, and allows relative rotation between the first rotating body and the second rotating body, wherein the elastic member has a vibration damping function. A power transmission mechanism is provided.
Further, in the present invention, an annular first rotator having a first concave portion having a narrow width at an inner peripheral edge of an inlet portion, and a disk-shaped member having a second concave portion at an outer peripheral edge and being internally fitted to the first rotator. And a resilient member capable of contacting the entrance of the first recess and the second recess. The elastic member contacts the entrance of the first recess and the second recess during torque transmission. The relative rotation between the first rotating body and the second rotating body is prevented, and at the time of torque interruption, the elastic member is pushed by the second concave portion and elastically deforms, and enters the first concave portion through the narrow entrance portion; A power transmission mechanism detached from the second recess and allowing relative rotation between the first rotating body and the second rotating body, wherein the elastic member has a vibration damping function is provided.
In the power transmission mechanism according to the present invention, since the elastic member has a vibration damping function, the short-period torque fluctuation of the drive source to which the first rotating body is connected, and the short-period of the rotating device to which the second rotating body is connected. Torsional vibration of the main shaft of the rotating device due to torque fluctuation is suppressed.
[0006]
In a preferred embodiment of the present invention, the elastic member is composed of a viscoelastic material alone or a cladding material of an elastic material alone and a viscoelastic material alone.
The elastic member composed of the viscoelastic material alone or the cladding material of the elastic material alone and the viscoelastic material alone has a vibration damping function.
[0007]
In the present invention, an annular first rotator having a first concave portion on an inner peripheral edge and a disk-shaped first rotary member having an inlet portion with a second concave portion having a narrow width on an outer peripheral edge are fitted into the first rotator. A second rotating body, and an elastic member capable of contacting the first concave portion and the entrance portion of the second concave portion. When the torque is transmitted, the elastic member contacts the first concave portion and the entrance portion of the second concave portion, and The first rotation body and the second rotation body are prevented from rotating relative to each other, and when the torque is cut off, the elastic member is pushed by the first recess to be elastically deformed, and enters the second recess through the narrow entrance portion. A power transmission mechanism detached from one recess and allowing relative rotation between the first rotating body and the second rotating body, wherein the elastic member has a rotation preventing portion is provided.
Further, in the present invention, an annular first rotator having a first concave portion having a narrow width at an inner peripheral edge of an inlet portion, and a disk-shaped member having a second concave portion at an outer peripheral edge and being internally fitted to the first rotator. And a resilient member capable of contacting the entrance of the first recess and the second recess. The elastic member contacts the entrance of the first recess and the second recess during torque transmission. The relative rotation between the first rotating body and the second rotating body is prevented, and at the time of torque interruption, the elastic member is pushed by the second concave portion and elastically deforms, and enters the first concave portion through the narrow entrance portion; A power transmission mechanism detached from the second recess and allowing relative rotation between the first rotating body and the second rotating body, wherein the elastic member has a rotation preventing portion is provided.
In the power transmission mechanism according to the present invention, since the elastic member has the rotation preventing portion, the breaking torque value is stabilized.
[0008]
In a preferred aspect of the present invention, the elastic member is an annular member or an annular member partially cut away.
In a preferred aspect of the present invention, the elastic member is an annular member having a part cut out, and a portion facing the notch is formed thicker than other parts.
Since the diameter of the annular member or the partially cut annular member is reduced by elastic deformation, the annular member can easily pass through the narrow entrance of the second recess or the narrow entrance of the first recess.
The partially cut elastic member is elastically deformed so that the gap between the notches is narrowed, so the part facing the notch is formed thicker than the other parts, and the bending stress at the part is reduced. It is desirable to do.
[0009]
In a preferred aspect of the present invention, the power transmission mechanism includes a falling-off prevention mechanism for preventing the elastic member from falling off.
At the time of assembling the power transmission mechanism, it is possible to prevent a situation in which the elastic member comes off from the second recess entrance or the first recess entrance.
[0010]
In a preferred aspect of the present invention, a contact portion between the elastic member and the first and second concave portions is lubricated.
In a preferred aspect of the present invention, the elastic member has a self-lubricating property.
Wear of the contact portion between the elastic member and the first and second concave portions is suppressed, and the breaking torque value is stabilized.
[0011]
In a preferred aspect of the present invention, a contact portion between the elastic member and the first and second concave portions is lubricated.
In a preferred aspect of the present invention, the elastic member has a self-lubricating property.
Wear of the contact portion between the elastic member and the first and second concave portions is suppressed, and the breaking torque value is stabilized.
[0012]
BEST MODE FOR CARRYING OUT THE INVENTION
A power transmission mechanism according to an embodiment of the present invention will be described.
As shown in FIG. 1, the power transmission mechanism 1 includes an annular first rotating body 2. The first rotating body 2 is supported by a compressor casing (not shown) via a bearing α. The first rotating body 2 is connected to a vehicle engine (not shown) via an endless belt (not shown). Three shallow arc-shaped first concave portions 2a are formed on the inner peripheral edge of the first rotating body 2 at predetermined intervals in the circumferential direction.
The power transmission mechanism 1 includes a disk-shaped second rotator 3 fitted to the first rotator 2 with a small gap therebetween. Three substantially circular second concave portions 3 a having a narrow entrance portion 3 a ′ are formed on the outer peripheral edge of the second rotating body 3 so as to face the first concave portion 2 a of the first rotating body 2. A main shaft of a compressor (not shown) extending concentrically with the second rotating body 3 is fixed to the second rotating body 3.
An annular elastic member 4 with a part cut out contacts the first concave part 2a and the inlet part 3a 'of the second concave part with the notch part 4a directed radially outward and the first concave part. 2a and the inlet 3a 'of the second recess. Less than half of the elastic member 4 is in the first recess 2a, and more than half of the resilient member is in the second recess 3a including the entrance 3a '.
The radius of curvature of the first concave portion 2a is set to a value larger than the radius of curvature of a part of the elastic member 4 that is less than half.
As shown in FIG. 2, the elastic member 4 includes an elastic portion 4b made of an elastic material such as metal, resin, and rubber, and a viscoelastic material made of a material obtained by adding a tackifier, a softener, and the like to rubber. This is a vibration damping member made of a clad material with the portion 4c.
[0013]
The operation of the power transmission mechanism 1 will be described.
Torque is transmitted from the vehicle engine (not shown) to the first rotating body 2 via an endless belt (not shown). The elastic member 4 abuts on the first recess 2a of the first rotating body 2 and the second recess entrance 3a 'of the second rotating body 3, and the relative rotation between the first rotating body 2 and the second rotating body 3 is increased. To block. Torque is transmitted from the first rotating body 2 to the second rotating body 3 via the contact portion between the first recess 2a and the elastic member 4 and the contact portion between the elastic member 4 and the second recess entrance 3a '. Is transmitted. Torque is transmitted from the second rotating body 3 to the main shaft of a compressor (not shown), and the compressor (not shown) operates.
As the transmission torque between the first rotating body 2 and the second rotating body 3 increases, the first concave portion 2a relatively moves in the circumferential direction with respect to the elastic member 4 and moves the elastic member 4 in the radial direction. And elastically deform it. The elastic member 4 is deformed and reduced in diameter so that the gap between the notches 4a is narrowed. When the transmission torque between the first rotating body 2 and the second rotating body 3 exceeds a predetermined value, the elastic member 4 whose diameter has been reduced and deformed passes through the narrow-width second recess entrance 3a ′ and is in the second recess 3a. , And separates from the first concave portion 2a to allow relative rotation between the first rotating body 2 and the second rotating body 3. Transmission of torque between the first rotating body 2 and the second rotating body 3 is interrupted.
As a result, when a compressor (not shown) is emergency stopped due to seizure of a sliding portion, excessive force acts on the vehicle engine, an endless belt connecting the vehicle engine and the power transmission mechanism 1, and the like, and these devices are damaged. Is prevented from occurring.
The elastic member 4 detached from the first recess 2a is held by the second recess 3a. The occurrence of a situation in which the elastic member 4 scatters from the power transmission mechanism 1 rotating at a high speed and damages nearby devices is prevented.
[0014]
Since the radius of curvature of the first concave portion 2a is larger than the radius of curvature of a part less than the half of the elastic member 4, when the torque is transmitted between the first rotary member 2 and the second rotary member 3, The first recess 2a can move relative to the elastic member 4 in the circumferential direction without hindrance. Accordingly, when the transmission torque between the first rotating body 2 and the second rotating body 3 exceeds a predetermined value, the power transmission mechanism 1 transmits the torque between the first rotating body 2 and the second rotating body 3. Can be reliably shut off.
[0015]
Short-period torque fluctuations of the vehicle engine and short-period torque fluctuations of the compressor are absorbed by the elastic member 4 having a vibration damping function, and torsional vibration of the main shaft of the compressor connected to the power transmission mechanism 1 is suppressed. .
The elastic member 4 may be made of a viscoelastic material alone.
[0016]
Since the diameter of the annular elastic member 4 partially cut is reduced by elastic deformation, the annular elastic member 4 can easily pass through the narrow second recess entrance 3a '.
As shown in FIG. 3, a disc-shaped or annular elastic member 4 having an elastic portion 4b and a viscoelastic portion 4c and having no notch may be used. The diameter is reduced by the elastic deformation, and it is possible to easily pass through the narrow second recess entrance 3a '.
[0017]
As shown in FIG. 4, protrusions 4d and 4e are formed on the elastic member 4 to be engaged with the second concave portion 3a, or the second concave portion entrance portion 3a 'is made flat and the second concave portion entrance portion 3a of the elastic member 4 is formed. The contact portion 4f for the elastic member 4 may also be formed as a flat surface to prevent the elastic member 4 from rotating.
When the elastic member 4 having the notch rotates on its own axis, the deformation of the elastic member 4 due to the pressing force applied from the first concave portion 2a changes, the difficulty of passing through the second concave portion entrance 3a 'changes, and the cutoff occurs. The torque value changes. The blocking torque value is stabilized by preventing the rotation of the elastic member 4. When using not only an elastic member having a notch but also an elastic member whose deformation mode is changed by the rotation of the pressing force applied from the first concave portion 2a, it is desirable to prevent the elastic member from rotating.
[0018]
As shown in FIG. 5, a portion 4g facing the cutout portion 4a of the elastic member 4 may be formed thicker than other portions.
Since the elastic member 4 is elastically deformed so as to reduce the gap between the notches 4a, the portion 4g facing the notch 4a is formed to be thicker than other portions, and the bending stress of the portion 4g is reduced. Is desirable.
[0019]
As shown in FIG. 6, a constriction 3 a ″ may be formed at the second recess entrance 3 a ′, and a constriction 4 h may be formed at the contact portion of the elastic member 4 with the entrance 3 a ′.
At the time of assembling the power transmission mechanism 1, it is possible to prevent the elastic member 1 from falling out of the second recess entrance 3 a ′.
[0020]
The elastic member 4 may be formed in an annular shape having an arbitrary outer shape such as an elliptical shape or a polygonal shape.
The numbers of the first recesses 2a, the second recesses 3a, and the elastic members 4 are not limited to three. When a plurality of elastic members 4 are provided, the external force applied to each elastic member 4 is reduced, and the size of the elastic members 4 can be reduced, and the power transmission mechanism can be reduced in size. Therefore, it is desirable that the number of the first concave portion 2a, the second concave portion 3a, and the elastic member 4 be plural.
A contact portion between the elastic member 4 and the first concave portion 2a and the second concave portion entrance 3a 'may be lubricated. The elastic member 4 may have self-lubricating properties. Wear of the contact portion between the elastic member 4 and the first recess 2a and the second recess entrance 3a 'is suppressed, and the breaking torque value is stabilized.
The opposed wall surfaces of the second recess entrance 3a 'may be a pair of curved surfaces, a pair of flat surfaces extending in parallel, or a pair of flat slopes in which a gap is spread radially outward in an eight-shape. good.
The first concave portion 2a is formed deep, the entrance portion is formed narrow, the second concave portion 3a is formed shallow, and the radius of curvature is set to be larger than the radius of curvature of the portion of the elastic member 4 located in the second concave portion 3a. Alternatively, the elastic member 4 may be brought into contact with the second concave portion 3a and the entrance of the first concave portion 2a, and the elastic member 4 may be held between the second concave portion 3a and the entrance of the first concave portion 2a. When the elastic member 4 comes into contact with the second recess 3a and the entrance of the first recess 2a, torque is transmitted from the first rotating body 2 to the second rotating body 3, and the elastic member 4 is pressed by the second recess. By entering the first concave portion through the narrow inlet portion and separating from the second concave portion, torque transmission from the first rotating body 2 to the second rotating body 3 is interrupted.
[0021]
【The invention's effect】
As described above, in the power transmission mechanism according to the present invention, the short-period torque fluctuation of the drive source to which the first rotating body is connected and the second rotating body are connected by the elastic member having the vibration damping function. Torsional vibration of the main shaft of the rotating device due to short-period torque fluctuation of the rotating device is suppressed.
[Brief description of the drawings]
FIG. 1 is a perspective view of a power transmission mechanism according to an embodiment of the present invention.
FIG. 2 is a plan view of a modification of the elastic member.
FIG. 3 is a plan view of a modification of the elastic member.
FIG. 4 is a plan view of a modification of the elastic member.
FIG. 5 is a plan view of a modification of the elastic member.
FIG. 6 is a plan view of a modification of the elastic member.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Power transmission mechanism 2 1st rotating body 2a 1st recess 3 2nd rotating body 3a 2nd recessed part 3a 'Entrance part 4 Elastic member 4b Elastic part 4c Viscoelastic part 4d, 4e Projection 4f Contact part
