Abstract: Hydraulic fan drive system with oil flow system. A modular valve mechanism is provided with coaxial oil passages to circulating lubrication oil through the clutch and to and from a heat exchanger.

Abstract: A clutch device for a motor vehicle has friction elements around which coolant flows and which, by way of a piston, can be pressed against one another for torque transmission. The first piston side is acted on with operating pressure, and the second piston side is acted on with coolant pressure. A valve, by which the operating pressure can be set, and a device which makes a reaction of the coolant pressure on the operating pressure possible are provided. The device is designed as a hydraulic resistance cascade and is connected between coolant supply and coolant return lines of the friction elements. A return pressure line branches off in the center of the hydraulic resistance cascade and is connected to the valve.

Abstract: A shaft system for an automatic transmission includes a stator support shaft having an internal axial bore for receiving an input shaft, a forward engagement portion for engaging a stator of a torque converter of the automatic transmission and an integral stator support flange extending radially outward for engaging a stator support of the automatic transmission and transferring to the stator support substantially all of a torque load imposed on the stator support shaft by the stator. The stator support flange includes at least one oil flow bore positioned therein to supply oil between different components of the transmission.

Abstract: A hydraulic system in motor vehicles with at least one hydraulically actuated clutch, which entails minimized control complexity for supplying the clutch with hydraulic oil and which takes up less structural space. These characteristics are achieved essentially in that the pressure control of the hydraulically actuated clutch is effected directly and exclusively by an electrically driven and electronically controlled oil pump.

Abstract: The invention relates to a shiftable clutch device (10), in particular in disc configuration, including at least a first clutch component (10E) and a second clutch component (10A), each clutch component including friction surface bearing and/or friction surface forming elements (1E, 1A, 1.1), configured to be brought into at least indirect operative engagement through a shifting device (14) that is loadable with a pressure medium through a pressure cavity (8), wherein devices for generating a cooling oil flow to the friction surface bearing and/or friction surface forming elements (1E, 1A, 1.1.) of the particular clutch components (10E, 10A) are provided in an “open” functional condition of the shiftable clutch device (10).

Abstract: A device for actuating a disk clutch (B) in a transmission, which consists of an actuating piston-cylinder arrangement with rotation pressure compensation, whose actuating piston (6) is associated with a pressure chamber (4) for a pressure medium fluid to produce the actuating force, and in which a pressure compensation chamber (26) is provided, in which by virtue of centrifugal action a pressure medium fluid produces on the actuating piston a compensation force directed in opposition to the actuation direction of the actuating piston, the pressure chamber and the pressure compensation chamber each having a delivery line (9, 21) for pressure medium fluid.

Abstract: A motor vehicle hydraulic pump (1) is provided comprising a gerotor rotor set or planetary rotor set and at least two output stages. A first output stage (10) of the hydraulic plump (1) is connected to a lubricant, in particular, a clutch lubricant. A second output stage (11) of the hydraulic pump (1) is connected to at least one clutch (2) of the actuation thereof. The invention also provides a method for actuating at least one clutch which is arranged in the motor vehicle by means of a motor vehicle hydraulic pump, whereby an inter-connection of a volume flow outlet of the first step (10) and the second step (11) of the hydraulic pump (1) takes place according to requirements for actuating the clutch.

Abstract: A dual clutch transmission having a hydraulic circuit for controlling and cooling the clutches of a dual clutch transmission having lube valves in fluid communication with a source of pressurized fluid and wherein the cooling flow is controlled by a solenoid which is adapted to move a valve member to produce a flow area through the valve that is an inverse function of the current delivered to the solenoid and so as to deliver a predetermined control solenoid pressure ultimately to each of the clutches of a dual dutch transmission.

Abstract: A three-channel torque converter in which an additional wall is mounted, thereby creating a third space which hydraulically connects the end of the plates that faces away from the turbine to a third channel. This third space ensures that an exchange flow of oil in a region of the hydrodynamic components (impeller, turbine, stator), of an optional damper, and of the lockup clutch is always restricted to flow across the plates of the lockup clutch. This provides high-performance cooling of the plates in the slip mode.

Abstract: A drive force transmitting apparatus comprises a dry clutch, a hydraulic cylinder, a piston arm, an elastic partitioning member, a first seal member and a leakage lubricating fluid recovery path. The elastic partitioning member prevents lubricating fluid that has leaked from a sliding portion of a piston of the hydraulic cylinder from flowing into the dry clutch. The first seal member is disposed between opposing surfaces of a cylinder housing and a clutch cover at a position downstream from the elastic partitioning member in a leakage flow direction of lubricating fluid that has leaked. The leakage lubricating fluid recovery path is at least partially formed by a gap between the cylinder housing and the clutch cover, such that lubricating fluid leaking past the piston is conveyed to an inside of the transmission while maintaining a sealed state established by the elastic partitioning member and the first seal member.

Abstract: A transmission includes first and second clutch members rotatable about the same axis. An axial groove is formed in one of the members to distribute lubricating fluid to the other member. Preferably, clutch plates with radial grooves extend between the clutch members. Fluid flows from the axial groove through the radial groove and across faces of the clutch plates to separate the plates during disengagement in order to minimize spin losses.

Abstract: A clutch system selectively transmitting torque in an automatic transmission according to an exemplary embodiment of the present invention may include: a rotation axis rotated by the torque; at least one plate disposed at an exterior of the rotation axis and moved along an axial direction of the rotation axis; at least one disk alternately disposed with the plate and moved along the axial direction of the rotation axis, the disk having at least one wave along a radial direction thereof; and a piston applying force to the disk and the plate along the axial direction of the rotation axis such that a frictional force is generated between the plate and the disk. Therefore, the clutch system of this invention has advantages of enhanced durability and operability.

Abstract: The invention relates to a transmission module (10) for an engine-transmission unit, said module comprising an input shaft (11) for connecting to a heat engine, an output shaft (12) for connecting to a gearbox, and a clutch (30) connecting said two shafts. The inventive module also comprises: an independent casing (16) comprising a first half-shell (17) and a second half-shell (18), said two half-shells forming a sealed receiving element (22) containing the clutch (30) which is naturally in the engaged position; a mechanical element (35) for maintaining the clutch (30) in said engaged position by means of a piston in the form of a disk; a hydraulic control circuit (40, 41) for acting directly on the piston against the mechanical element, in the disengaged position of said clutch (30); and a hydraulic circuit (50, 52, 53, 55, 56) for lubricating and cooling the clutch. The invention can be applied to an engine-transmission unit for motor vehicles.