The description relates to devices that include hinged portions and controlling rotation of the portions. One example can include a display that is configured to rotate relative to an axis. The example can also include a clutch assembly interposed between first and second planet gear assemblies positioned along the axis. The first and second planet gears configured to multiply resistance to rotation around the axis that is supplied by the clutch assembly.

An electronic control unit executes gradual reduction control when a friction clutch is to be maintained in a fully engaged state such that an input rotary member and an output rotary member rotate integrally. As a result, a motor current supplied to a motor is adjusted to a lower current value. Thus, an average current value of the motor current supplied to the motor when the friction clutch is to be maintained in the fully engaged state is appropriately reduced.

The work vehicle includes: a clutch device including a forward-travel clutch and a backward-travel clutch configured to cause, when being in an engagement state, the work vehicle to travel in a forward travel direction and a backward travel direction; a forward-backward travel instruction device configured to instruct the work vehicle to travel in the forward travel direction or the backward travel direction; a clutch state detection device configured to detect whether the forward-travel clutch and the backward-travel clutch are each in the engagement state; and a torque restriction section configured to restrict a maximum absorbing torque of the hydraulic pump to be low when a restriction condition holds, the restriction condition including a condition that a traveling direction of the work vehicle, which corresponds to an engagement state of the clutch device, and a traveling direction of the work vehicle, which is instructed by the forward-backward travel instruction device are opposite to each other.

A transfer includes: an input shaft; an output shaft; a high-low switching mechanism; an output member whose output destination is different from output destination of the output shaft; a clutch for transmitting a power to the output member; a first transmitting mechanism for transmitting movement of an internally threaded member to the clutch; and a drum cam having a cam groove. The cam groove includes a first inclined section that causes the high-low switching mechanism to be switched between a high-speed gear stage and a low-speed gear stage, and a second inclined section that causes the first transmitting mechanism to be switched between (i) a separated position in which the first transmitting mechanism is separated from the clutch and (ii) a contact position in which the first transmitting mechanism is in contact with the clutch, while the high-speed gear stage is established in the high-low switching mechanism.

A clutch for selectively preventing rotation of a rotating component may include a first and second pawls pivotable between engagement and disengagement with the rotating component to selectively prevent or allow rotation of the rotating component in one or both directions. An armature moveable between a first and second armature positions may have a common member pivotally connected thereto and engaging the first and second pawls, with a torque spring biasing the common member to rotate toward the first pawl and away from the second pawl. In an intermediate armature position, the common member may disengage the first pawl from the rotating component while engaging the second pawl to allow rotation in one direction while preventing rotation in the opposite direction. In embodiments, a clutch may include a cam actuator rotating to selectively control engagement of the pawls with the rotating component and locking in one or both directions.

A clutch for selectively preventing rotation of a rotating component may include a first and second pawls pivotable between engagement and disengagement with the rotating component to selectively prevent or allow rotation of the rotating component in one or both directions. An armature moveable between a first and second armature positions may have a common member pivotally connected thereto and engaging the first and second pawls, with a torque spring biasing the common member to rotate toward the first pawl and away from the second pawl. In an intermediate armature position, the common member may disengage the first pawl from the rotating component while engaging the second pawl to allow rotation in one direction while preventing rotation in the opposite direction. In embodiments, a clutch may include a cam actuator rotating to selectively control engagement of the pawls with the rotating component and locking in one or both directions.

A clutch arrangement for a hybrid vehicle powertrain including an input shaft to be connected to a crankshaft of an internal combustion engine, an output shaft for connection to a transmission, a one-way clutch comprising an inner race connected to rotate with the input shaft and an outer race, a coupling hub rotationally coupled with the output shaft, a synchronizer ring arranged between the coupling hub and the one-way clutch, the synchronizer ring cooperating with the outer race of the one-way clutch, and a coupling sleeve unit that is selectively and axially moveable across the coupling hub. The synchronizer ring and the outer race include three positions, a neutral position, a first position, and a second position.

A composite clutch (110) is adapted to transmit an operational range of torques (60) from a driving member (118) to a driven member (122). The composite clutch (110) incorporates both of a friction clutch assembly (124) and a dog clutch assembly (126), each assembly adapted to address one of two segments (62, 68) of the operational range of torques (60). The clutch (110) further includes a spring-loaded detent system (180) configured to control transition (66) between the two segments (62, 68) of operational ranges of torques (60). The friction clutch assembly (124) includes first friction clutch elements (128) coupled to the driving member (118) and second friction clutch elements (132) coupled to the driven member (122) for providing torque control within the lower operational range of torques (64). The dog clutch assembly (126) includes a first dog clutch element (136) coupled to the driving member (118) and a second dog clutch element (138) coupled to the driven member (122), in which the first and second dog clutch elements (136, 138) are configured to mechanically lock together during the higher operational range of torques (70).

A composite clutch (110) is adapted to transmit an operational range of torques (60) from a driving member (118) to a driven member (122). The composite clutch (110) incorporates both of a friction clutch assembly (124) and a dog clutch assembly (126), each assembly adapted to address one of two segments (62, 68) of the operational range of torques (60). The clutch (110) further includes a spring-loaded detent system (180) configured to control transition (66) between the two segments (62, 68) of operational ranges of torques (60). The friction clutch assembly (124) includes first friction clutch elements (128) coupled to the driving member (118) and second friction clutch elements (132) coupled to the driven member (122) for providing torque control within the lower operational range of torques (64). The dog clutch assembly (126) includes a first dog clutch element (136) coupled to the driving member (118) and a second dog clutch element (138) coupled to the driven member (122), in which the first and second dog clutch elements (136, 138) are configured to mechanically lock together during the higher operational range of torques (70).

A clutch may include a hub configured to be constrained to a rotation shaft; a sleeve configured to be straight slidably disposed on an external circumferential surface of the hub; a clutch gear configured to be disposed to be relatively rotatable with respect to the rotation shaft; a first friction ring configured to be mounted between the clutch gear and the hub; a key configured to be mounted between the sleeve and the hub; and a displacement changing portion configured to change a relative rotation displacement of the first friction ring with respect to the hub to an axial linear displacement of the first friction ring.