JP2019138410A5 - - Google Patents

Description

次に、出力部材３に出力側機構から回転トルクが逆入力された場合を説明する。
出力部材３に回転トルクが逆入力されると、図５に示すように、出力係合カム１２が、１対の係合面部１９同士の内側で、出力部材３の回転方向（図５の例では時計方向）に回転する。すると、出力係合カム１２の角部が係合面部１９を径方向外方に向けて押圧し、１対の係合子５ａ、５ｂを、被押圧面１５に近づく方向にそれぞれ移動させる。つまり、１対の係合子５ａ、５ｂを、係合面部１９と出力係合カム１２との係合に基づき、遠近方向に関して互いに離れるように径方向外側に（図５の上側に位置する係合子５ａを上側に、図５の下側に位置する係合子５ｂを下側に）それぞれ移動させる。これにより、１対の係合子５ａ、５ｂのそれぞれの押圧面１６を、被押圧面１５に対して押し付ける。この際、押圧面１６と被押圧面１５とは、押圧面１６の周方向に関する全範囲で面接触する。本例の逆入力遮断クラッチ１は、出力部材３に回転トルクが逆入力されると、出力部材３の回転方向に関係なく、１対の係合子５ａ、５ｂを、被押圧面１５に近づく方向にそれぞれ移動させる。そして、押圧面１６と被押圧面１５との当接（接触）に基づき、出力部材３に逆入力された回転トルクが入力部材２に伝達されないようにするか又はその一部のみが伝達されるように機能する。出力部材３に逆入力された回転トルクが入力部材２に伝達されないようにするには、押圧面１６が被押圧面１５に対して摺動（相対回転）しないように、１対の係合子５ａ、５ｂを出力係合カム１２と押圧部材４との間で突っ張らせ、出力部材３をロックする。これに対し、出力部材３に逆入力された回転トルクのうちの一部が入力部材２に伝達されるようにするには、押圧面１６が被押圧面１５に対して摺動するように、１対の係合子５ａ、５ｂを出力係合カム１２と押圧部材４との間で突っ張らせ、出力部材３を半ロックする。
Next, a case where the rotational torque is reversely input to the output member 3 from the output side mechanism will be described.
When the rotational torque is reversely input to the output member 3, as shown in FIG. 5, the output engaging cam 12 is inside the pair of engaging surface portions 19 and the rotational direction of the output member 3 (example of FIG. 5). Then it rotates clockwise). Then, the corner portion of the output engaging cam 12 presses the engaging surface portion 19 outward in the radial direction, and the pair of engaging elements 5a and 5b are moved in the directions approaching the pressed surface 15, respectively. That is, based on the engagement between the engaging surface portion 19 and the output engaging cam 12, the pair of engaging elements 5a and 5b are radially outwardly separated from each other in the perspective direction (engagers located on the upper side in FIG. 5). (5a is moved upward, and the engager 5b located on the lower side of FIG. 5 is moved downward). As a result, the respective pressing surfaces 16 of the pair of engaging elements 5a and 5b are pressed against the pressed surface 15. At this time, the pressing surface 16 and the pressed surface 15 come into surface contact with each other in the entire circumferential direction of the pressing surface 16. In the reverse input shutoff clutch 1 of this example, when the rotational torque is reversely input to the output member 3, the pair of engagers 5a and 5b are brought closer to the pressed surface 15 regardless of the rotational direction of the output member 3. Move to each. Then, based on the contact (contact) between the pressing surface 16 and the pressed surface 15 , the rotational torque reversely input to the output member 3 is prevented from being transmitted to the input member 2, or only a part thereof is transmitted. Works like. In order to prevent the rotational torque reversely input to the output member 3 from being transmitted to the input member 2, a pair of engagers 5a so that the pressing surface 16 does not slide (relatively rotate) with respect to the pressed surface 15 5b is stretched between the output engaging cam 12 and the pressing member 4 to lock the output member 3. On the other hand, in order to transmit a part of the rotational torque reversely input to the output member 3 to the input member 2, the pressing surface 16 slides with respect to the pressed surface 15. A pair of engaging elements 5a and 5b are stretched between the output engaging cam 12 and the pressing member 4, and the output member 3 is half-locked.