Door-opening/closing apparatus

[0023]FIG. 1 is a block diagram of a door-opening / closing unit to which a door-opening / closing apparatus of a first embodiment of the present invention is applied. FIG. 2 is schematic diagram of the door-opening / closing apparatus shown in FIG. 1. FIG. 3 is a front view of the door-opening / closing apparatus shown in FIG. 2. FIG. 4 is a side view of the door-opening / closing apparatus shown in FIG. 2. FIG. 5 is a vertical cross-section of a clutch shown in FIG. 3. FIG. 6A to FIG. 6C illustrates an operation of the clutch.

[0024] A door unit 1 for a vehicle comprises an opening 2a of a vehicle body 2, a door 3 which supports an upper portion of the opening 2a and closes the opening 2a, a door-opening / closing switch 4, a position detection switch 5 which detects a position of the door, a switch 6 which switches between an automatic opening / closing operation and a manual opening / closing operation of the door 3, a door-opening / closing apparatus 7, a closer 8 and a control de

[0046]FIG. 7 is a vertical cross-section of a clutch of a door-opening / closing apparatus according to a second embodiment of the present invention. FIG. 8A to FIG. 8C illustrates an operation of the clutch.

[0047] Like the clutch of the door-opening / closing apparatus of the first embodiment, the clutch of the door-opening / closing apparatus of the second embodiment comprises a housing, an input shaft rotatably supported by a housing, and an output shaft which transmits a rotation of the input shaft in the current-carrying state and cuts off the transmission of the rotation of the input shaft in the non-current-carrying state. Since the housing and the input shaft are the same as those of the clutch of door-opening / closing apparatus of the first embodiment, they are designated with the same symbols and explanation thereof is omitted.

[0048] The clutch of the door-opening / closing apparatus according to the second embodiment is different from that of the first embodiment in that