Abstract: A clutch assembly includes a shaft, a balance dam sealed to the shaft, a seal plate axially spaced from the balance dam and sealed to the shaft, and a piston. The piston is sealed to the shaft and disposed axially between the balance dam and the seal plate. The piston includes an orifice extending axially therethrough. A pressure chamber is bounded in part by the piston and the seal plate. A balance chamber is bounded in part by the piston and the balance dam. The pressure chamber is in fluid communication with the balance chamber via the orifice.

Abstract: A drive train has a hydrodynamic retarder including a rotating bladed rotor and bladed stator, forming a working chamber for hydrodynamic transmission of power from rotor to stator, a power input feeding drive power to the retarder, and a synchronized separating clutch connected between power input and rotor. The clutch has two clutch halves, friction elements contacting each other and mechanical blocking elements. The friction elements equalize rotational speed between clutch halves, and the blocking elements form-lockingly connect the clutch halves. The clutch has an actuator displaceable along a displacement travel, over a first distance bringing the friction elements into mutual contact, and a second distance adjoining the first distance to synchronize the friction elements and rotational speed for locking with the blocking elements. At least one displacement sensor directly or indirectly detects displacement travel by the actuator and/or position of the actuator on the displacement travel.

Abstract: A hydraulic actuating device for a coupling device having an actuating piston, a piston chamber assigned to the actuating piston and a supply chamber which is arranged further inwards in the radial direction than the piston chamber and via which a hydraulic fluid can be supplied to the piston chamber, wherein the supply chamber is delimited in a first axial direction by a first housing part and in a second axial direction opposite to the first axial direction by a second housing part, and the first housing part is fastened to a hub. The first housing part is fastened to the hub by clamping the second housing part in the axial direction between the first housing part and the hub. Furthermore, the present invention relates to a coupling device having such an actuating device as well as a method for manufacturing such an actuating device.

Abstract: A corrosion protection device, system, and method are provided. The device may operate while being coupled to the object being protected and to a power source using a total of only two terminals. This may be accomplished by de-referencing the return path node of the circuit using a choke device that blocks a temporal AC component of an anti-corrosion signal. The choke device therefore diverts the anti-corrosion signal to a single negative/ground path to the object and then returns through a positive lead of the circuit. A two terminal corrosion protection device may thereby simplify the installation process, for example on a vehicle, by not requiring that another connection be made to the object at a spaced apart location from a first connection to the object.

Abstract: A multi-clutch device for a hybrid module includes a separating clutch, a dual clutch device, a first pivot bearing, a common rotary part, a second pivot bearing, a gear element, and a clamping device. The separating clutch is for transmitting torque from an internal combustion engine to the multi-clutch device. The dual-clutch device is for transmitting torque to a drivetrain. The dual clutch device includes a first partial clutch and a second partial clutch. The common rotary part is mounted rotatably by the first pivot bearing, and couples the separating clutch, the first partial clutch, and the second partial clutch in a rotationally fixed manner. The gear element is mounted rotatably by the second pivot bearing, and forms a gear between the electrical machine and the multi-clutch device. The clamping device is for clamping the common rotary part and the gear element against each other in the axial direction.

Abstract: A transmission device that includes a first clutch that includes a first clutch drum, a first piston, and a first engagement oil chamber; and a second clutch that includes a second clutch drum fixed to an outer circumferential portion of the first clutch drum, a second piston, and a second engagement oil chamber.

Abstract: A torque transmission device for a powertrain system includes a continuously variable transmission (CVU) arranged in parallel with a transfer gear set. The CVU variator includes a first pulley rotatably coupled to a first rotating member and a second pulley rotatably coupled to a second rotating member. The transfer gear set includes a first gear selectively rotatably coupled to a second gear via activation of a clutch. The clutch includes a first rotating element and a second rotating element that rotate in concert when the clutch is activated. The first rotating element rotatably couples to the first rotating member and the second rotating element rotatably couples to the first gear. The first gear rotates in a fixed ratio with rotation of the second gear when the clutch is activated. The second gear rotatably couples to the second rotating member.

Abstract: A power transmission unit including a first clutch device that selectively enables and disables a torque transmitting route from an input shaft to an output shaft via a first gear train to transmit torque therethrough, a dog clutch that switches the torque transmitting route from the input shaft to the output shaft between a continuously variable speed change route in which torque is transmitted through a continuously variable transmission and a reverse route in which torque is transmitted through a second gear train, and a second clutch device that selectively enables and disables both of the continuously variable speed change route and the reverse route to transmit torque to the input shaft or the output shaft. The first clutch device and the second clutch device are separately disposed on any of the input shaft and the output shaft in a manner to be situated at different axial positions.

Abstract: A power transmission unit for a vehicle is provided. In the power transmission unit, a continuously variable transmission to alter a speed ratio continuously is disposed between an input shaft to which a torque of a prime mover is inputted and an output shaft rotated by the torque transmitted from the input shaft. A first gear train that transmits the torque to propel the vehicle in the forward direction is arranged parallel to a second gear train that transmits the torque to propelling the vehicle backwardly.

Abstract: In a vehicle having a brake line communicating a brake pressure to a brake, a lubrication control circuit controls flow of lubrication fluid to a brake cooling circuit. The lubrication control circuit includes a lube pressure control proportional valve and a shuttle valve. The lube pressure control valve communicates lube fluid to an inlet of the shuttle valve when lube pressure is above a threshold. When the brake is applied, brake pressure in a pilot line operates on the shuttle valve and the shuttle valve communicates lube fluid to the brake cooling circuit and blocks lube flow to other cooling or lube circuits.

Abstract: A flow separation hub including a first hub component, a second hub component affixed to the first hub component, a first passage arranged through the first and second hub components for enabling a first fluid to flow through the flow separation hub, a second passage arranged through the first and second hub components for enabling a second fluid to flow through the hub, wherein the hub prohibits fluid communication between the first and second fluids when the first and second fluids flow through the hub.

Abstract: A transmission device includes a first clutch and a second clutch that is disposed circumferentially inward of the first clutch so as to overlap with the first clutch as viewed from a radial direction. The first clutch includes a first clutch drum, a first clutch piston that is axially movable by hydraulic pressure supplied to a first engagement side oil chamber on an inner circumferential side of the first clutch drum, and a first cancel plate that defines together with the first clutch piston a first cancel oil chamber that cancels centrifugal hydraulic pressure. The first cancel plate is fastened between the first clutch drum and a second clutch drum of the second clutch.

Abstract: A torque converter including an impeller clutch with a first portion connected to a cover for the torque converter and a second portion connected to an impeller; and a lever element in contact with the clutch and displaceable to multiply a first force applied to the lever element for operation of the clutch. In some aspects, the converter includes an impeller piston plate engaged with the lever element and displaceable to apply the force to the lever element. In some aspects, the torque converter includes a torus and a charge chamber for the impeller clutch, a second force is associated with a hydraulic pressure to prevent cavitation in the torus, a third force is required to operate the impeller clutch to transmit a desired torque across the impeller clutch, and the multiplied force is at least equal to a sum of the second force and a third forces.

Abstract: A dual clutch actuation device generates the axial compression force required to compress a first and second set of frictional elements of a dual clutch module. Dual clutch actuation device includes a first and second annular piston. The annular pistons include a first end that is in contact with annular bearing assemblies. The annular bearing assemblies are in contact with actuation levers that are in contact with the first set of frictional elements. The annular pistons are arranged in concentric annular piston slots. Together the piston and annular slots form annular piston chambers. The piston chambers are filled with hydraulic fluid. The actuation device further includes a first set of wiper seals and a second set of wiper seals disposed in a first and a second annular channel in each of the annular pistons. When the hydraulic fluid is pressurized the pistons slide out of the annular slots and apply a force on the actuation levers which in turn apply an axial compression force on the frictional elements.