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CN-122003551-A - Cam clutch

CN122003551ACN 122003551 ACN122003551 ACN 122003551ACN-122003551-A

Abstract

The invention aims to provide a cam clutch which has a simple structure and can easily switch an operation mode with a small force. Specifically, the cam clutch is provided with a 1 st urging means (150) for urging a plurality of cams (136) disposed between an inner ring (110) and an outer ring (120) so as to rotate in the engagement direction, wherein the inner ring (110) and the outer ring (120) are disposed so as to be rotatable coaxially with each other, and a 2 nd urging means (155) for urging the plurality of cams (136) with urging forces different in magnitude from the urging force of the 1 st urging means (150) so as to rotate in the engagement release direction, and is configured so that the urging force of one of the 1 st urging means (150) and the 2 nd urging means (155) that urges the same cam is changed to be relatively smaller than the urging force of the other urging means by a switching means (170), whereby the operation mode can be switched.

Inventors

  • KAWASAKI TAKESHI

Assignees

  • 株式会社椿本链条

Dates

Publication Date
20260508
Application Date
20240712
Priority Date
20231002

Claims (8)

  1. 1. A cam clutch includes an inner ring and an outer ring which are arranged so as to be rotatable coaxially with respect to each other, a plurality of cams arranged between the inner ring and the outer ring, a1 st urging means for urging the cams so as to rotate in an engagement direction, and a switching means configured so as to be capable of forcibly rotating the cams to switch an operation mode, The cam is provided with a 2 nd urging means for urging the cam in a direction of releasing engagement by urging the cam with an urging force different from that of the 1 st urging means, The switching means includes a cam posture changing portion configured to change the urging force of one of the 1 st urging means and the 2 nd urging means, which is larger than the urging force of the other urging means, to be relatively smaller than the urging force of the other urging means.
  2. 2. The cam clutch according to claim 1, wherein, The cam linkage member is provided to link the rotation actions of all cams.
  3. 3. The cam clutch according to claim 2, wherein, The cam includes a1 st cam and a 2 nd cam having different engagement directions from each other, The cam interlocking member is configured to rotate one of the 1 st cam and the 2 nd cam in the engagement releasing direction when the other cam rotates in the engagement direction.
  4. 4. The cam clutch according to claim 1 or claim 2, wherein, The switching means is provided so as to be movable in the axial direction in a state where the cam posture changing portion is located between adjacent cams, The cam posture changing section is configured to be able to change the urging force of the 1 st urging means to the cam by the axial movement of the switching means.
  5. 5. The cam clutch according to claim 4, wherein, The force applied by the 1 st force applying unit is smaller than the force applied by the 2 nd force applying unit to the same cam, The cam posture changing section is configured to change the 1 st urging means to a state in which the 1 st urging means can urge the cam with a larger urging force than the 2 nd urging means.
  6. 6. The cam clutch according to claim 4, wherein, The force applied by the 1 st force applying unit is larger than the force applied by the 2 nd force applying unit to the same cam, The cam posture changing section is configured to change the 1 st urging means to a state in which the urging means can urge the cam with a smaller urging force than the 2 nd urging means or to a state in which the urging of the cam is released.
  7. 7. The cam clutch according to claim 1 or claim 2, wherein, At least one of the 1 st urging means and the 2 nd urging means is common to each of the plurality of cams.
  8. 8. The cam clutch according to claim 3, wherein, The switching unit includes a1 st switching unit that changes the urging force of one of the 1 st urging unit and the 2 nd urging unit to the 1 st cam, and a2 nd switching unit that changes the urging force of one of the 1 st urging unit and the 2 nd urging unit to the 2 nd cam.

Description

Cam clutch Technical Field The present invention relates to a cam clutch. Background A clutch for controlling transmission and disconnection of a rotational force is known which includes an inner ring and an outer ring, a plurality of cams as engaging members disposed between the inner ring and the outer ring, and urging means for urging the cams in an engagement direction, and for example, a clutch having a switching means configured to be capable of changing an operation mode of the clutch by forcibly tilting the cams is also known. For example, in patent document 1 or patent document 2, the normal rotation wedge and the reverse rotation wedge as the engagement elements are configured to be arranged between the inner ring and the outer ring in a state in which the urging means urges the engagement direction, and the switching means is moved in the axial direction, so that the normal rotation wedge and the reverse rotation wedge can be tilted in the engagement releasing direction. In these two-way clutches, torque is input to the inner ring or the outer ring, and one of the forward sprags and the reverse sprags becomes a wedge and is wedged into the inner ring and the outer ring, thereby enabling torque transmission. On the other hand, by moving the switching means in the axial direction, the forward rotation wedge and the reverse rotation wedge are tilted in the engagement releasing direction against the urging force of the urging means, respectively, and thereby, the idle rotation can be performed in both the forward and reverse directions. Further, since the one-way clutch is also provided with the switching means, an idle mode that allows relative rotation between the inner ring and the outer ring in both the forward and reverse directions can be realized. Patent literature Patent document 1 Japanese patent laid-open No. 6-017851 Patent document 2 Japanese patent laid-open No. 2008-121867 Disclosure of Invention However, in the clutch provided with the switching means, the sprags are firmly supported by the torque received from the inner ring and the outer ring when the torque is transmitted. Therefore, in order to press the sprags in the circumferential direction by the switching unit and tilt them in the engagement releasing direction, an extremely large force is required, and thus the operation of the switching unit in torque transmission may cause breakage of the sprags or the switching unit. In particular, in a bidirectional clutch in which driving and idling are switched in both the forward and reverse directions, when torque is applied to the inner race or the outer race, elastic deformation occurs in the sprag, the inner race, and the outer race, respectively, and as a result, a rotation angle difference (twist) occurs in the inner race and the outer race, and when the load is removed, the twist returns to zero. When torque is transmitted by engaging one of the forward and reverse sprags with the inner ring and the outer ring, the other sprag is kept in contact with the outer ring and the inner ring while sliding, and the engagement standby state is maintained. Therefore, when torque is released, one of the wedges is tilted in the engagement releasing direction and transits to the idle state, but at this time, the other wedge starts to tilt in the engagement direction and engages with the outer ring and the inner ring until the engagement of the one wedge is released, and thus there is a possibility that "biting" in which all the cams are engaged at the same time occurs. As described above, in the bidirectional clutch, since biting due to twisting occurs, even if rotation of the inner ring or the outer ring is stopped to remove torque, all the sprags are engaged with a high surface pressure, and thus there is a problem in that a large force is required to press the sprags in the circumferential direction by the switching means and tilt them in the engagement releasing direction. The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a cam clutch which has a simple structure and can easily switch an operation mode with a small force. A cam clutch includes an inner ring and an outer ring which are disposed so as to be rotatable coaxially with respect to each other, a plurality of cams disposed between the inner ring and the outer ring, a1 st urging means for urging the cams so as to rotate in an engagement direction, and a switching means configured so as to be capable of forcibly rotating the cams to switch operation modes, wherein the cam clutch is provided with a 2 nd urging means for urging the cams to rotate in an engagement releasing direction with urging forces of different magnitudes from those of the 1 st urging means, and the switching means is provided with a cam posture changing section configured so that an urging force of one of the 1 st urging means and the 2 nd urging means, which is larger than an urging force