CLUTCH

摘要

A clutch is provided with a drive-side rotational body and a driven-side rotational body, which is movable in the axial direction of the drive-side rotational body between a coupled position. The driven-side rotational body has a groove having a helical portion and an annular portion. The clutch also includes an urging member and a pin that is selectively inserted into and retracted from the groove. The clutch moves the driven-side rotational body to the decoupled position against the urging force of the urging member by inserting the pin in the helical portion. The clutch further includes a restricting portion that restricts shifting of the position of the pin from the annular portion to the helical portion when the pin is positioned in the annular portion.

主权项

1. A clutch comprising:
a drive-side rotational body; a driven-side rotational body movable in an axial direction of the drive-side rotational body between a coupled position at which the driven-side rotational body is coupled to the drive-side rotational body and a decoupled position at which the driven-side rotational body is decoupled from the drive-side rotational body; an urging member that urges the driven-side rotational body from the decoupled position toward the coupled position; a groove formed in an outer circumferential surface of the driven-side rotational body, wherein the groove has a helical portion that extends about an axis of the driven-side rotational body and an annular portion that is formed continuously from the helical portion and extends over an entire circumference of the driven-side rotational body and perpendicularly to the axial direction; a pin that is selectively inserted into and retracted from the groove and restricted from moving in the axial direction, wherein, when the pin is in a state inserted in the helical portion and engaged with a side wall of the helical portion, the position of the pin is shifted from the helical portion to the annular portion through rotation of the driven-side rotational body such that the driven-side rotational body is moved to the decoupled position against urging force of the urging member; and a restricting portion that restricts shifting of the position of the pin from the annular portion to the helical portion when the pin is in a state located in the annular portion.