An actuating device for a coupling/braking device is provided with at least one actuating piston that is axially slidable relative to a shaft and, in an actuating state, exerts an axially acting contact pressure on coupling/braking parts of the coupling/braking device. At least one control piston is provided that axially displaces the at least one actuating piston into the actuating position. A coating is provided in a contact region between the actuating piston and the control piston, wherein the coating is disposed at the actuating piston or at the control piston or at both the actuating piston and the control piston. The actuating piston can also be designed as a control piston that interacts immediately with the coupling/braking parts of the coupling/braking device.

A multimode clutch assembly is positioned in a powertrain of a rotorcraft. The clutch assembly includes a freewheeling unit having a driving mode in which torque applied to the input race is transferred to the output race and an overrunning mode in which torque applied to the output race is not transferred to the input race. A bypass assembly has an engaged position that couples the input and output races of the freewheeling unit. An actuator assembly shifts the bypass assembly between engaged and disengaged positions. An engagement status sensor is configured to determine the engagement status of the bypass assembly. In the disengaged position, the overrunning mode of the freewheeling unit is enabled such that the clutch assembly is configured for unidirectional torque transfer. In the engaged position, the overrunning mode of the freewheeling unit is disabled such that the clutch assembly is configured for bidirectional torque transfer.

The present invention relates to a generator drive disconnect device, of a generator arranged to be driven by an aircraft engine. The disconnect device comprises: a drive transfer means (1) having a first, connected configuration, and a second, disconnected configuration; a disconnect biasing means (200), configured to bias the drive transfer means to the disconnected configuration; and a fluid cavity (300), configured such that provision of a pressurised fluid in the fluid cavity biases the drive transfer means to the connected configuration.

A clutch device includes a plurality of clutches; a plurality of cylinder chambers provided to respectively correspond to the clutches; a pump configured to discharge a hydraulic fluid; a plurality of control valves each of which is configured to control the hydraulic fluid supplied from the pump to a corresponding one of the cylinder chambers; and an oil passage that distributes the hydraulic fluid discharged from the pump, to the control valves. The oil passage includes at least one split point at which the hydraulic fluid discharged from the pump splits. At least one check valve is provided between the at least one split point and at least one control valve among the control valves, the at least one check valve being configured to block a flow of the hydraulic fluid in a direction from the at least one control valve toward the at least one split point.

A fluid actuated clutch (40) includes a disc pack (120) that includes friction discs (122) and separator discs (124) mounted on a hub (50). A cylinder (68) which includes a movable piston (72) is in connection with the hub. The introduction and release of fluid to a variable volume chamber (76) selectively applies force to the disc pack to engage the clutch and releases the force to disengage the clutch. The clutch includes internal bearings (90, 82). Grease or other lubricant material is injected into a radially extending lubricant passage (96). The lubricant is held in the area of the bearings and other moving parts by rigid annular grease shields (93, 79). Annular grease release gaps (61, 107) prevent over packing with lubricant while maintaining lubrication and facilitating cooling.

A clutch thrust bearing device includes a rolling bearing having a fixed ring, a rotatable ring, and a plurality of rolling elements between the rings; an axially movable piston disposed between a housing and the rolling bearing and having a radial plate pressing against an axial contact surface of the fixed ring; at least one resilient seal member sealing the piston relative to the housing; and a resilient body exerting an axial preload onto an axial contact surface of the rotatable ring. The rolling bearing is axially movable by the piston to compress the resilient body. A resilient sleeve is mounted to the fixed ring and has at least one sealing lip in sliding contact with the rotatable ring.

A dual clutch unit for variable torque distribution to two output shafts comprises: a clutch input part rotatably drivable about an axis; a first disk pack for transmitting torque from the clutch input part to a first clutch output part, wherein the first disk pack is axially loadable by a first pressure plate and is axially supported against the clutch input part via a first intermediate plate; a second disk pack for transmitting torque from the clutch input part to a second clutch output part, wherein the second disk pack is axially loadable by a second pressure plate and is axially supported against the clutch input part via a second intermediate plate; wherein the first intermediate plate and the second intermediate plate are axially arranged between the first disk pack and the second disk pack and are axially engaged with each other such that they are axially supported independently of each other against the clutch input part.

A driving force distribution apparatus includes a driving force connecting/disconnecting mechanism between a pinion gear shaft and an intermediate rotational member, a first driving force adjustment mechanism between the intermediate rotational member and a second output rotational member, a second driving force adjustment mechanism between the intermediate rotational member and a first output rotational member, and a hydraulic unit configured to generate pressures of hydraulic oil for operating the driving force connecting/disconnecting mechanism and the first and second driving force adjustment mechanisms. The hydraulic unit includes a single hydraulic pump and a hydraulic circuit configured to distribute a pressure of the hydraulic oil, which is discharged from the hydraulic pump, to cylinder chambers of pistons.

A clutch mechanism switches a clutch to one of an engaging state and a released state by a piston operated by an oil pressure. The piston includes a first side surface portion configured to press the clutch, and a second side surface portion on which the oil pressure acts. The second side surface portion has an uneven shape in a circumferential direction.

A clutch device includes a clutch housing including a cylindrical portion and a bottom, a multiple disc clutch, a receiving member and a pressing member that moves in an axial direction with respect to the clutch housing to press the multiple disc clutch from the bottom side toward the receiving member. The pressing member includes an annular portion disposed radially inward or outward of the bottom and a plurality of protruding portions protruding in a radial direction from the annular portion, the annular portion being provided integrally with the protruding portions. The bottom of the clutch housing has a plurality of cutouts that accommodate the protruding portions. The protruding portions move in the axial direction within the cutouts to press the multiple disc clutch.