A clutch unit includes a lever-side clutch part to control transmission and interruption of rotational torque input through a lever operation and a brake-side clutch part to transmit the rotational torque from the lever-side clutch part to the output side and interrupt rotational torque reversely input from the output side. The brake-side clutch part includes an outer ring constrained in rotation, an output shaft to output the rotation, cylindrical rollers to control interruption of the rotational torque reversely input from the output shaft and transmission of the rotational torque input from the lever-side clutch part through engagement and disengagement between the outer ring and the output shaft, a friction ring to apply a rotational resistance to the output shaft, and a variable part to change the rotational resistance applied to the output shaft between the transmission and the interruption of the rotational torque.

A clutch unit includes a lever-side clutch part to control transmission and interruption of rotational torque input through a lever operation and a brake-side clutch part to transmit the rotational torque from the lever-side clutch part to the output side and interrupt rotational torque reversely input from the output side. The brake-side clutch part includes an outer ring constrained in rotation, an output shaft to output the rotation, cylindrical rollers to control interruption of the rotational torque reversely input from the output shaft and transmission of the rotational torque input from the lever-side clutch part through engagement and disengagement between the outer ring and the output shaft, a friction ring to apply a rotational resistance to the output shaft, and a variable part to change the rotational resistance applied to the output shaft between the transmission and the interruption of the rotational torque.

A freewheel of a vehicle, in particular a two-wheeler, includes (i) a first shaft, (ii) a second shaft having a first gear cog, (iii) a freewheel element having a second gear cog, and (iv) a friction element. The first gear cog and the second gear cog are configured to, when engaged with each other, effect a torque transfer between the second shaft and the freewheel element. The freewheel element is arranged to be displaceable in an axial direction on the first shaft. The freewheel element is arranged to be non-rotatable relative to the first shaft in the circumferential direction. The freewheel element and the friction element are connected to one another by way of a helical mechanism which is configured to effect a translational displacement of the freewheel element and the friction element relative to one another when the freewheel element and friction element rotate relative to one another.

A freewheel of a vehicle, in particular a two-wheeler, includes (i) a first shaft, (ii) a second shaft having a first gear cog, (iii) a freewheel element having a second gear cog, and (iv) a friction element. The first gear cog and the second gear cog are configured to, when engaged with each other, effect a torque transfer between the second shaft and the freewheel element. The freewheel element is arranged to be displaceable in an axial direction on the first shaft. The freewheel element is arranged to be non-rotatable relative to the first shaft in the circumferential direction. The freewheel element and the friction element are connected to one another by way of a helical mechanism which is configured to effect a translational displacement of the freewheel element and the friction element relative to one another when the freewheel element and friction element rotate relative to one another.

A selectable one-way clutch includes a fixed plate, a rotatable plate, a switching plate, an arm member, and an actuator including an operating shaft member for moving the arm member. Lubricating oil is interposed between any adjacent two of the fixed plate, the switching plate and the rotatable plate. Where a first distance is a distance from a rotation center of the switching plate to a contact point of an operating portion of the arm member and a first contact portion of the operating shaft member in normal switching operation from a disengaged state to an engaged state and a second distance is a distance from the rotation center of the switching plate to a contact point of the operating portion of the arm member and a second contact portion of the operating shaft member in switching plate erroneous operation, the second distance is larger than the first distance.

A drive system for driving a movable flow body having a drive unit, a shaft, a torque sensing device, a no-back friction unit, and an axial bearing. The drive unit is coupled with the shaft to rotate the shaft, the torque sensing device is coupled with at least one of the drive unit and the shaft to detect a torque transferred from the drive unit into the shaft, the no-back friction unit is arranged between the axial bearing and an axial support means of the shaft, such that an axial load of the shaft is supported by the axial bearing, and the no-back friction unit is configured to substantially not counteract a rotation of the shaft in a first direction of rotation of the shaft and to apply a friction-induced additional torque to the shaft in an opposite second direction of rotation.

A drive system for driving a movable flow body having a drive unit, a shaft, a torque sensing device, a no-back friction unit, and an axial bearing. The drive unit is coupled with the shaft to rotate the shaft, the torque sensing device is coupled with at least one of the drive unit and the shaft to detect a torque transferred from the drive unit into the shaft, the no-back friction unit is arranged between the axial bearing and an axial support means of the shaft, such that an axial load of the shaft is supported by the axial bearing, and the no-back friction unit is configured to substantially not counteract a rotation of the shaft in a first direction of rotation of the shaft and to apply a friction-induced additional torque to the shaft in an opposite second direction of rotation.

A selectable one-way clutch includes a pocket plate formed with a plurality of recessed receptacles on one face thereof, a notch plate arranged so as to oppose the face of the pocket plate on which the recessed receptacle is formed and capable of relatively rotating with respect to the pocket plate, an engagement recessed portion formed on a face of the notch plate corresponding to the recessed receptacle, a plate-shaped engagement piece received in the recessed receptacle, and an elastic member arranged between a bottom portion of the recessed receptacle and the engagement piece and biasing the engagement piece toward a side of the notch plate. An oil passage that discharges lubricant oil to a side of the recessed receptacle from a side of the engagement recessed portion is formed at the engagement piece.

A selectable one-way clutch includes a pocket plate formed with a plurality of recessed receptacles on one face thereof, a notch plate arranged so as to oppose the face of the pocket plate on which the recessed receptacle is formed and capable of relatively rotating with respect to the pocket plate, an engagement recessed portion formed on a face of the notch plate corresponding to the recessed receptacle, a plate-shaped engagement piece received in the recessed receptacle, and an elastic member arranged between a bottom portion of the recessed receptacle and the engagement piece and biasing the engagement piece toward a side of the notch plate. An oil passage that discharges lubricant oil to a side of the recessed receptacle from a side of the engagement recessed portion is formed at the engagement piece.

A torque limiting assembly is disclosed comprising: an input shaft; an output shaft; a drive bush; a motion converter mechanism; a casing; and at least one engagement member for engaging the casing. In a low torque mode, rotation of the input shaft drives rotation of the drive bush, motion converter mechanism and output shaft. In a high torque mode, rotation of the motion converter mechanism relative to the output shaft urges the motion converter mechanism axially to drive rotation of the drive bush relative to the input shaft. The engagement member is coupled to both the drive bush and the input shaft such that when the drive bush is rotated relative to the input shaft, the engagement member is urged to engage the casing so as to prevent or inhibit rotation of the input shaft relative to the casing.