A switchable one-way clutch is able to switch between operating as a one-way clutch and a clutch that locks in both directions. The clutch includes an inner race, and an outer race that includes an inner surface with a plurality of ramped profiles. A control plate is located radially outward from the inner race and moveable in an axial direction relative to the outer race. A plurality of rollers are contactable with the outer and inner races. A roller cage is configured to position and contain the plurality of rollers. A hydraulic piston is coupled to an actuator arm, such that movement of the piston along the axis moves the actuator arm along the axis. To switch and engage the clutch such that rotation is locked in both directions, the piston and actuator arm move axially to hold the control plate and attached roller cage against rotation.

To downsize the periphery of reaction force applying device of a clutch controller, and set operation load more freely, in a clutch control system that links the clutch controller and a clutch device electrically, an operation reaction force is applied to a clutch lever, from reaction force applying device that uses a spring as a reaction force generation source; the reaction force applying device includes multiple reaction force generation cylinders arranged parallel to one another; and the clutch lever has an input/output arm, which extends toward an input/output part of each of the multiple reaction force generation cylinders from the vicinity of a lever support shaft, to allow transmission of operating force and reaction force between the clutch lever and the reaction force applying device.

A power transmitting system including: a first piston disposed within a center bore formed through the rotary shaft such that the first piston is axially reciprocable; a sleeve connected to the first piston and having internal teeth meshing with the external teeth of the rotary shaft so that the sleeve is rotated with the rotary shaft, and such that the sleeve is axially reciprocable together with the first piston according to axial movements of the first piston; a synchronizer ring supported in sliding contact with an outer circumferential tapered surface of the clutch gear such that the synchronizer ring is rotatable relative to the clutch gear; and an actuator including a second piston to axially advance the first piston for thereby bringing the sleeve's internal teeth into meshing engagement with the clutch gear through the synchronizer ring. The first piston and second piston are disposed coaxially with the rotary shaft.

A clutch drive unit 220 includes a crank arm 221 configured to rotate by rotary driving of a clutch actuator 231. The crank arm 221 includes an output pin 222 configured to press a master cylinder 232, and a receiving pin 223 configured to receive pressing force P from an extendable body 228. The extendable body 228 includes a lock spring 228a with such strength that the pressing force P is generated. The pressing force P allows pressing moment PM greater than reactive force moment RM based on reactive force R acting on the crank arm 221 from a clutch 210 to act on the crank arm 221. The extendable body 228 is, by the stretching force of the lock spring 228a, provided in a stretched state between the receiving pin 223 and a holder receiving pin 229.

This clutch actuator includes a hydraulic pressure generating mechanism (51) configured to operate a clutch (26) to provide a connected state or a disconnected state, a motor (52) configured to generate a rotary driving force for driving the hydraulic pressure generating mechanism (51) to a driving shaft (52a), a transmission mechanism (54) configured to transmit the rotary driving force generated in the driving shaft (52a) of the motor (52) to a driven member (54b) parallel to the driving shaft (52a) in an axial direction and disposed coaxially with a cylinder main body (51a), and a conversion mechanism (55) configured to convert the rotary driving force transmitted to the driven member (54b) into a reciprocal driving force of a piston (51b) in a stroke direction, wherein the hydraulic pressure generating mechanism (51), the motor (52), the transmission mechanism (54) and the conversion mechanism (55) are integrated as a unit.