CLUTCH MECHANISM AND TRANSMISSION

摘要

Under the condition that the rotation speed of a first rotating shaft is higher than that of a second rotating shaft, supported portions go through right-handed helical flutes to perform an engaging operation. Under the condition that the rotation speed of the first rotating shaft is lower than that of the second rotating shaft, the supported portions go through left-handed helical flutes to perform the engaging operation. In a releasing operation, the supported portions go through the right-handed helical flutes to release a clutch mechanism under the condition that the rotation speed of the first rotating shaft is lower than that of the second rotating shaft, and the supported portions go through the left-handed helical flutes to release the clutch mechanism under the condition that the rotation speed of the first rotating shaft is higher than that of the second rotating shaft.

主权项

1. A clutch mechanism comprising:
a first rotation member; a movable member provided with an engaging portion; and a second rotation member provided with an engagement portion configured to engage with the engaging portion of the movable member, wherein the first rotation member is provided with a supporting portion which supports the movable member, and the movable member is movable relative to the first rotation member along the supporting portion, the supporting portion includes a non-engaging portion which supports the movable member at a position where the engaging portion of the movable member does not engage with the engagement portion of the second rotation member, a right-handed helical portion and a left-handed helical portion located closer to the second rotation member side than the non-engaging portion, a branch portion which branches into the right-handed helical portion and the left-handed helical portion from the non-engaging portion, and a joining portion which is located closer to the second rotation member side than the branch portion and in which the right-handed helical portion and the left-handed helical portion join, and when the support position where the movable member is supported by the supporting portion has moved from the non-engaging portion to the branch portion, the engagement between the engaging portion of the movable member and the engagement portion of the second rotation member starts, the clutch mechanism further comprising a restriction mechanism which restricts the movement of the movable member relative to the first rotation member when the support position where the movable member is supported by the supporting portion is a joining portion.