A clutch unit includes an operation lever, an operation bracket, an output shaft member, an input-side clutch, an output-side clutch, and a housing. An input-side outer ring member of the input-side clutch is a member including a bottom part and an outer ring part. A part of the outer ring part is a thick part. The thickness of the thick part in the radial direction is larger than the thickness of a non-thick part in the radial direction.

The electric motor with a reverse input cutoff clutch has an output shaft. The output shaft is configured by connecting a first shaft and a second shaft that are coaxially arranged with each other via the reverse input cutoff clutch. The second shaft is rotatably supported to a housing by one radial bearing. The reverse input cutoff clutch has a function that, when rotational torque is inputted to the first shaft, transmits the rotational torque inputted to the first shaft to the second shaft, and when rotational torque is reversely inputted to the second shaft, completely cuts off the rotational torque reversely inputted to the second shaft, and does not transmit the rotational torque to the first shaft, or transmits a part of the rotational torque to the first shaft, and cuts off the remaining part.

An object of the present invention is to provide a cam clutch capable of switching from one operating mode to another with a simple structure and with high responsiveness, and of securing an expected torque capacity. The cam clutch of the present invention includes an operating mode switch mechanism (140) for switching between a free state that allows relative rotation between an inner race (110) and an outer race (120) and a locked state that prohibits relative rotation between the inner race (110) and the outer race (120). The operating mode switch mechanism (140) includes a cam attitude change part (142) that is movable circumferentially, radially, or axially independently of the rotation of the inner race (110) and the outer race (120) to forcibly tilts a plurality of cams (131) circumferentially arranged between the inner race (110) and the outer race (120).

A directional transmission mechanism, a directional sprocket apparatus using the directional transmission mechanism, and a pedal device using the directional sprocket apparatus are disclosed. The directional transmission mechanism includes a driving shaft, an output shaft, a co-rotating wheel, a reverse-rotating wheel, and a switching mechanism. The co-rotating wheel set drives the output shaft to rotate in a direction that is the same as that of the driving shaft. The reverse-rotating wheel set drives the output shaft to rotate in a direction opposite to that of the driving shaft. The switching mechanism switches the driving shaft to drive the co-rotating wheel set or drive the reverse-rotating wheel set to rotate, so as to enable the output shaft to rotate directionally. The co-rotating wheel set is connected with the driving shaft and the output shaft, and the reverse-rotating wheel set is connected with the driving shaft and the output shaft.

A roller clutch including an outer race, an inner race, a first engagement member situated between the outer race and the inner race, and a second engagement member situated between the outer race and the inner race. The first engagement member is configured to engage the outer race and the inner race to transmit torque between the outer race and the inner race only in response to the inner race turning in a positive direction and applying negative torque to the first engagement member. The second engagement member is configured to engage the outer race and the inner race to transmit torque between the outer race and the inner race in response to the inner race applying positive torque to the second engagement member while the outer race applies negative torque to the second engagement member.

A gear reducer has a helical gear, an eccentric shaft that is joined to the helical gear and has a first supporting portion that is offset in a rotation radial direction with respect to a rotation shaft of the helical gear, and a slider plate that is disposed at a radial direction outer side of the eccentric shaft. Further, the gear reducer has a transmitting gear that is supported at a first supporting portion, and whose rotation around its own axis is restricted due to the transmitting gear being engaged with the slider plate, and that revolves due to the helical gear rotating together with the eccentric shaft, and has an output gear body that rotates due to the transmitting gear revolving. The transmitting gear has a pair of restricting projections that project-out toward the slider plate side, and the slider plate is disposed between the pair of restricting projections.

A gear reducer has a helical gear, an eccentric shaft that is joined to the helical gear and has a first supporting portion that is offset in a rotation radial direction with respect to a rotation shaft of the helical gear, and a slider plate that is disposed at a radial direction outer side of the eccentric shaft. Further, the gear reducer has a transmitting gear that is supported at a first supporting portion, and whose rotation around its own axis is restricted due to the transmitting gear being engaged with the slider plate, and that revolves due to the helical gear rotating together with the eccentric shaft, and has an output gear body that rotates due to the transmitting gear revolving. The transmitting gear has a pair of restricting projections that project-out toward the slider plate side, and the slider plate is disposed between the pair of restricting projections.

A clutch unit includes a lever-side clutch section configured to control transmission and interruption of rotational torque input by a rotation of an operation lever, and a brake-side clutch section configured to transmit the rotational torque from the lever-side clutch section to an output side and interrupt rotational torque that is reversely input from the output side. The lever-side clutch section includes a side plate to which the operation lever is fixed and an outer ring member that fits with the side plate. The brake-side clutch section includes a cover whose rotation is restricted. An angle regulating part configured to regulate a rotation angle of the operation lever is disposed radially inside of outer peripheral edges of the outer ring member and the cover and includes a claw of the outer ring member and a through hole of the cover.

A reverse-input blocking clutch includes: a pressed member having a pressed surface; an input member having an input-side engaging portion on an inner side in a radial direction of the pressed surface; an output member having an output-side engaging portion further on the inner side in the radial direction than the input-side engaging portion; an engaging element on the inner side in the radial direction of the pressed surface to move in a first direction away from or toward the pressed surface, having a main engaging element body having a pivot-support shaft, and a link member having a first end portion pivotally linked to the pivot-support shaft and a second end portion pivotally linked to the input-side engaging portion; and an elastic body between the main engaging element body and the link member and applying an elastic force to the link member toward the pressed surface in the first direction.

A brake-side clutch part includes an outer ring whose rotation is restricted and an output shaft from which rotation is output. The outer ring is provided with a slide gear that meshes with the output shaft when rotational torque is cut off and releases a meshing state with the output shaft when rotational torque is transmitted. The output shaft is provided with an inner gear that meshes with the slide gear so as to be slightly rotatable. An alignment part that aligns a phase of the inner gear with that of the slide gear when rotational torque is cut off, and a centering part that returns the inner gear to a neutral position with respect to the output shaft when rotational torque is transmitted are provided between the inner gear and the output shaft.