Abstract: A switching unit for a hybrid module for a drivetrain of a hybrid vehicle is provided. A first clutch is selectively closable to transmit torque from a drive shaft to a first output shaft. A second clutch is selectively closable to transmit torque from the drive shaft to a second output shaft. A plurality of ducts include a cooling oil supply duct, a first cooling oil duct configured to supply cooling oil to the first clutch, and a second cooling oil duct configured to supply cooling oil to the second duct. A switching unit selectively supplies cooling oil to the first and second clutches via the first and second cooling oil ducts, respectively, wherein the switching unit includes a slide having an aperture extending therethrough, and the slide is configured to move to alternatively fluidly the coiling oil supply duct with the first or second cooling oil ducts.

Abstract: An engine assembly may include an internal combustion engine, an expander coupled to the engine, a pulley rotatably arranged on a shaft of the expander and coupled to the engine, a coupling device including at least one elastic operating element arranged within an operating element accommodation in an axially deformable manner, a drive disk arranged on the shaft between the pulley and the at least one operating element, and a pressure device connected to the operating element accommodation via a fluid line and configured to apply pressure to the operating element accommodation. The at least one operating element may be deformable in an axial direction such that the at least one operating element adjusts the drive disk into force-transferring contact with the pulley when the at least one operating element is deformed by a pressure applied to the operating element accommodation by the pressure device.

Abstract: A torque transmission device between an input side and an output side including a torque converter having a pump, a turbine, a lockup clutch for transmitting a torque between the input side and the output side, and a torsional vibration damper arranged in a casing. The lockup clutch has a clutch input coupled to the casing, a clutch output rotatable relative to the input, and an actuating element for actuating the lockup clutch. The torsional vibration damper has at least one first damper stage comprising a first damper input part and a first damper output part, which can be rotated to a limited extent relative to the first damper input part by the action of at least one first energy storage element, wherein an absorber mass is attached to one of the damper components.

Abstract: A starting element with a friction clutch and a piston configured to actuate the friction clutch. The starting element includes a piston space separated from a residual space of the starting element at least partially by the piston, a first connection constructed such that the piston is acted upon by a hydraulic medium proceeding from one side of the residual space, and a second connection fluidically connected to the piston space. A maximum pressure present at the second connection is equal to and/or less than a pressure present at the first connection.

Abstract: The invention relates to a wet-running multi-plate clutch (1) comprising a number of inner plates (2) and a number of outer plates (3), and a first friction lining (6) is disposed on either side of every inner plate (2) respectively and a second friction lining (8) is disposed on either side of every outer plate (3) respectively, and the first friction linings (6) are located entirely underneath the second friction linings (8) in the radial direction so that the first friction linings (6) move into frictional contact with the outer plate main bodies (7) when the multi-plate clutch (1) is engaged and the second friction linings (8) move into frictional contact with the inner plate main bodies (5) when the multi-plate clutch (1) is engaged.

Abstract: An oil circuit includes an oil pan in which oil is stored, an oil supply line extending from the oil pan, a cooling oil supply line branched from the oil supply line and connected to the dual clutch of the dual clutch transmission, a lubricating oil supply line branched from the oil supply line and connected to the gearbox of the dual clutch transmission, a distribution valve disposed in the oil supply line and configured to distribute the oil to the cooling oil supply line and the lubricating oil supply line, and an oil pump configured to pump the oil from the oil pan, and a control device configured to control an operation of the oil pump and to control an opening degree of the distribution valve.

Abstract: A system of a work vehicle includes an engine, a transmission that includes a hydrostatic unit, and a clutch coupled to the transmission. The system also includes a controller communicatively coupled to the engine, the transmission, and the clutch. The controller, in operation, receives a command to disengage the clutch. The controller, in operation, determines an engine speed of the engine. The controller, in operation, also determines a temperature of hydraulic fluid in the clutch. The controller, in operation, further determines a magnitude and time to limit acceleration of the work vehicle based on the engine speed and the temperature. The controller, in operation, also commands the clutch to disengage. The controller, in operation, further limits the acceleration of the work vehicle using the hydrostatic unit based on the magnitude for the time determined.

Abstract: A multi-plate dual clutch for coupling a motor vehicle engine to a drive shaft of a motor vehicle transmission and to an auxiliary power take-off output shaft of the motor vehicle. The dual clutch includes a drive clutch for coupling the motor vehicle engine with the drive shaft, and an auxiliary power take-off clutch for coupling the motor vehicle engine with the auxiliary output shaft. The drive clutch and the auxiliary power take-off clutch can each to be operated independently of one another by a separate lever mechanism. The dual clutch includes a wet chamber housing in which the drive clutch and the auxiliary power take-off clutch are accommodated in fluid-tight relationship, while the respective lever mechanisms for the drive clutch and the auxiliary power take-off clutch are located outside the wet chamber housing.

Abstract: Methods and apparatus related to electrolaminate clutches and transmissions are disclosed. A device can include: an input shaft that can be coupled to an electrolaminate sheet; an output shaft that can be coupled rigidly to a spring positioned over the input shaft, where the spring includes a tab that fits a groove of a spring capture ring that can be positioned over the input shaft; and a drum connected to an electrical ground between the electrolaminate sheet and the spring capture ring, where the drum can be coupled rigidly to the spring capture ring. Then, when a voltage is applied to the electrolaminate sheet, the electrolaminate sheet can clamp to the drum and impart rotation of the input shaft to the drum. The imparted rotation can cause the spring capture ring and the spring to rotate and clamp down on the input shaft, imparting rotation to the output shaft.

Abstract: A method and device for actuating a shift element of an automatic transmission having a start-stop function and a pressure medium pump driven by an internal combustion engine. The shifting elements are clutches or brakes that can be actuated by a piston which is actuated for engagement via pressure supplied to a pressure space. The pressure space is depressurized when the engine stops. To enhance start-stop operation, the shifting elements comprise an additional pressure space that acts, in opposition to the pressure space acting in the engaging direction, as a controllable restoring mechanism which can be rendered inactive, if desired. If the engine stops and the automatic start-stop function is activated, the additional pressure spaces, acting in the restoring direction, are depressurized before the pressure drop in the pressure spaces, acting in the engaging direction, of the pistons, but are otherwise permanently pressurized during driving operation.

Abstract: An object detection system is configured to detect location of an object proximate a first surface of a vehicle. A beacon is configured to be positioned and repositioned relative to the vehicle. A controller is configured to process data from the object detection system and position data from the beacon. The controller is configured to define a first zone of interest relative to the first surface of the vehicle body structure without the beacon and further process object location data from the object detection system and output the object location data to the display relative to the first zone of interest. The controller determines current location of the beacon relative to the first surface of the vehicle body structure, defines a second zone of interest relative to the beacon and outputs the object location data to a display relative to the second zone of interest.

Abstract: A hydraulic valve assembly (1) with a housing (18) and with a spool (2) which is rotatable in the housing (18). The spool comprising a pressure supply orifice (3) and at least one clutch actuating orifice (4, 5) which is connectable to a clutch actuating cylinder (6, 7). The spool (2) comprises a pressure release orifice (8) which is arranged at the spool (2) so that the pressure release orifice (8) is closed by rotational movement of the spool (2) while the clutch actuating orifice (4, 5) is opened by such rotational movement. The invention further relates to a clutch actuating device with such a hydraulic valve assembly (1) and a corresponding marine propulsion system.

Abstract: A transfer case is provided with a primary shaft which is selectively engagable with a secondary shaft via a clutch mechanism. The clutch mechanism is inclusive of a friction pack. A hub of the clutch mechanism is connected on the primary shaft and the clutch housing is torsionally fixed with a primary sprocket rotatively mounted on the primary shaft. A passive or active controlled lubricant collection receptacle is provided which maximize fluid retention in conditions wherein there is not a high demand of torque for the clutch system of the transfer case thereby minimizing fluid that is unnecessarily churned by engagement with the hub connected with the secondary shaft.

Abstract: A plate carrier for a multi-plate clutch comprises: an annular member with a first circumferential face and a second circumferential face; a toothing in the first circumferential face of the annular member, having circumferentially distributed teeth and gaps; at least one groove in the second circumferential face of the annular member, wherein the groove extends over a circumferential portion of the annular member, wherein the groove and the toothing intersect one another, so that radial apertures are formed in the regions of intersection between the groove and the tooth gaps. A multi-plate clutch can be provided with such a plate carrier.

Abstract: A clutch unit for a motor vehicle comprises a friction clutch and an actuator for actuating the friction clutch, the actuator having a first ramp ring and a second ramp ring, of which at least one can be rotated relative to the other ramp ring, in order to exert an axial force on the friction clutch. Furthermore, the clutch unit comprises a metering device for feeding a cooling fluid in a metered manner to the friction clutch. The metering device has a first metering section which is assigned to the first ramp ring, and a second metering section which is assigned to the second ramp ring, the first metering section and the second metering section together delimiting a metering opening for the cooling fluid. The first metering section and the second metering section interact in such a way that the cross section of the metering opening, which cross section is delimited by the metering sections, can be varied by way of a relative rotation of the ramp rings.

Abstract: The present teachings provide for a power transmitting component including a housing, a clutch, a vent, and a dam. The vent can fluidly couple a first and second cavity. The dam can include a door member. Rotation of the outer carrier through a fluid in the second cavity can sling a portion of the fluid toward the vent to cause the portion of the fluid to be transferred from the second cavity, through the vent, and to the first cavity. When the piston is in a first position, the door member can be in a closed position to limit fluid flow from the first cavity to the second cavity. When the piston is in a second position, the door member can be in an open position to allow fluid to flow from the first cavity to the second cavity.

Abstract: A method for actuating a shift element of an automatic transmission having a start-stop function and a pressure medium pump driven by an internal combustion engine. The shifting elements are clutches or brakes that can be actuated by a piston which is actuated for engagement via pressure supplied to a pressure space. The pressure space is depressurized when the engine stops. To enhance start-stop operation, the shifting elements comprise an additional pressure space that acts, in opposition to the pressure space acting in the engaging direction, as a controllable restoring mechanism which can be rendered inactive, if desired. If the engine stops and the automatic start-stop function is activated, the additional pressure spaces, acting in the restoring direction, are depressurized before the pressure drop in the pressure spaces, acting in the engaging direction, of the pistons, but are otherwise permanently pressurized during driving operation.

Abstract: A power transmitting device can include a clutch, filter and housing defining first and second sumps spaced apart by a first wall. First and second members can meshingly engage and rotate through the first sump. The clutch plates can rotate through the second sump. A third member can be drivingly coupled to the second member and clutch plates. An outer surface of the third member and the first wall can define an annular cavity that fluidly couples the sumps. The filter can be received in the annular cavity about the third member and can include a second wall, outer portion, inner portion, and a filter element. The second wall can define an aperture. The outer portion can seal with the first wall. The inner portion can seal with the outer surface. The filter element can span the aperture to permit fluid communication between the sumps and inhibit passage of solids.

Abstract: A wet friction clutch comprising at least one clutch component which is rotatable around a shaft, wherein in the interior of the clutch component a rotary valve component that is rotatable around the shaft is formed which is deflectable by an angle of deflection in comparison to the rotatable clutch component by a relative rotation around the shaft, wherein the rotatable clutch component has at least one first opening and the rotary valve component has at least one second opening, wherein a total opening is released by an at least partial overlapping of the first opening and the second opening, the size of the total opening being dependent on the angle of deflection.

Abstract: A flow control assembly for an automatic transmission includes a valve for opening and closing communication with a source of pressurized fluid and a rotatable cam secured to a member, contact between the cam and a plunger of the valve causing said communication to open, absence of contact between the cam and the plunger causing said communication to close.

Abstract: A hydraulic actuating device for actuation of clutches in a multi-clutch transmission for motor vehicles is disclosed, comprising a multi-circuit pump having an electric pump drive, at least two pressure circuits hydraulically connected with the pump, and a reservoir for hydraulic fluid, from which the fluid can be conveyed by the pump to the pressure circuits. In this regard, each pressure circuit starting from the pump comprises a non-return valve blocking in the direction of the pump, an electromagnetically actuable proportional throttle valve, by way of which the respective pressure circuit can be the subject of defined hydraulic relief in direction towards the reservoir, and at the outlet side a slave cylinder operatively connected with an associated clutch. The pump drive and the proportional throttle valves are electrically connected with a control unit, which co-ordinates the electrical activation of the pump drive and the proportional throttle valves.

Abstract: A backing plate for a friction clutch pack includes a shoulder or flange through which a plurality of radial drain passageways extend. The radial drain passageways intersect a circumferential channel which collects hydraulic fluid from the friction clutch. The radial passageways, assisted by centrifugal force, direct hydraulic fluid flow radially outwardly, away from other friction pack clutches and thus prevent such fluid from creating drag and causing increased spin losses as it flows to and through disengaged clutch packs.

Abstract: The present invention relates to a multi-disc clutch for the transfer of torque between a first clutch part and a second clutch part, having at least one first and at least one second disc that engage on another and that are movable parallel to a rotational axis of the multi-disc clutch, and having a reset device for the receiprocal ventilation of adjacent discs. The first clutch part is connected in a rotationally secure fashion to the first disc and the second clutch part is connected in a rotationally secure fashion to the second disc. The reset device has at least two reset elements that are disposed eccentrically relative to the rotational axis and distributed in the circumferential direction.

Abstract: A vehicle drive train includes a first power disconnection device and a first driveline for transferring torque to a first set of wheels. A second driveline for transferring torque to a second set of wheels includes a differential gearset having an output coupled to a second power disconnection device. A hypoid gearset is positioned within the second driveline in a power path between the first and second power disconnection devices. The second power disconnection device includes a clutch having a first set of clutch plates fixed for rotation with the differential gearset output. The clutch further includes a second set of clutch plates fixed for rotation with a shaft adapted to transfer torque to one of the wheels of the second set of wheels. A valve limits a flow of coolant to the clutch when the second power disconnection device operates in a disconnected mode.

Abstract: A transmission configuration for a vehicle with at least a wet clutch (7) functioning as starting element. A coolant and a lubricant supply is provided via at least a pump device (5) which can be driven by a drive motor (1) of the vehicle. The pump device (5) can be driven in such a way that the conveyed flow volume of the pump device (5) is proportional to the rotational speed difference between the rotational speed of the drive motor (1) and the rotational speed of the clutch (7) which is designed and functions as the starting element.

Abstract: A wet clutch includes a rotatable hub and a rotatable drum having an aperture extending therethrough. A plurality of outer clutch plates are fixed for rotation with the drum. A plurality of inner clutch plates are fixed for rotation with the hub and interleaved with the outer clutch plates. A piston is moveable to apply a force to the inner and outer clutch plates to transfer torque between the hub and the drum. A cover is moveable relative to the drum between first and second positions. The cover selectively restricts a flow of fluid through the aperture in the drum when in the first position.

Abstract: A method and device are provided for securing lubrication of an automated manual transmission, AMT, in a vehicle, when towing the vehicle, and where a transmission lubrication system is drivingly connected to and driven by rotation of an intermediate shaft of the AMT. The following steps can be executed in mentioned order and starting from when ignition of the vehicle is switched on: registering a signal that towing of the vehicle is demanded, disengaging all gears that are arranged to drivingly engage or disengage an input shaft to the intermediate shaft of the automated manual transmission, and engaging one gear that is arranged to drivingly engage or disengage the intermediate shaft to an output shaft of the automated manual transmission.

Abstract: An embodiment of a multidisk oil-bath clutch having: a housing mounted to rotate; at least one hub mounted to rotate and housed inside and coaxially with the housing; a number of drive disks housed inside the housing and angularly integral with the housing or the hub; a number of driven disks housed inside the housing, alternating with the drive disks, and angularly integral with the hub or the housing; at least one oil inlet into the housing; and at least one oil outlet from the housing. Each drive disk has a number of first circulation channels extending radially from an inner edge of the drive disk; and each driven disk has a number of second circulation channels extending radially from an inner edge of the driven disk.

Abstract: A wet clutch includes a rotatable hub and a rotatable drum having an aperture extending therethrough. A plurality of outer clutch plates are fixed for rotation with the drum. A plurality of inner clutch plates are fixed for rotation with the hub and interleaved with the outer clutch plates. A piston is moveable to apply a force to the inner and outer clutch plates to transfer torque between the hub and the drum. A cover is moveable relative to the drum between first and second positions. The cover selectively restricts a flow of fluid through the aperture in the drum when in the first position.

Abstract: An embodiment of a multidisk oil-bath clutch having: a housing mounted to rotate about a longitudinal axis of rotation; at least one hub mounted to rotate about the longitudinal axis of rotation and housed inside and coaxially with the housing; a number of drive disks housed inside the housing and angularly integral with the housing or the hub; a number of driven disks housed inside the housing, alternating with the drive disks, and angularly integral with the hub or the housing; at least one oil inlet into the housing; and at least one oil outlet from the housing. Each drive disk has a number of first circulation channels equally spaced about the longitudinal axis of rotation and extending radially from an inner edge of the drive disk to an outer edge of the drive disk; and each driven disk has a number of second circulation channels equally spaced about the longitudinal axis of rotation and extending radially from an inner edge of the driven disk to an outer edge of the driven disk.

Abstract: A multiple clutch device 1 includes a first clutch component 10, a second clutch component 20, a first oil channel 51, and a second oil channel 51. The first clutch component 10 is able to link an input shaft 2 and a first output shaft 3 by frictional engagement. The second clutch component 20 is able to link the input shaft 2 and a second output shaft 4 by frictional engagement. The first oil channel 51 serves to supply lubricating fluid to the first clutch component 10. The second oil channel 52 is substantially independent from the first oil channel 51, and serves to supply lubricating fluid to the second clutch component 20.

Abstract: A vehicle drive device comprising a friction engagement device disposed on a power transfer path between an engine and wheels and including a first friction plate drivably coupled to a power transfer path on the engine side and a second friction plate drivably coupled to a power transfer path on the wheels side, a rotary electric machine drivably coupled to the power transfer path on the wheels side, a case member including an internal space where the first and second friction plates of the friction engagement device are housed, the internal space being configured to dip the first and second friction plates in oil and a communication mechanism that regulates communication between the internal space of the case member and an external space, the communication mechanism allowing the oil to be discharged from the internal space to the external space when communication between the internal and external spaces is allowed.

Abstract: A hub assembly for a torque converter includes a hub with a circumferential groove and a seal arranged to contact an element of the torque converter. The seal is at least partially disposed in the groove. The groove has a first radial wall, a second radial wall axially offset with respect to the first radial wall, and at least one opening in the second radial wall. The seal is axially displaceable to seal against the first wall to block fluid flow between the hub and the element and to seal against the second radial wall and enable fluid flow through the opening.

Abstract: The invention concerns a multi-disk brake (1) in an automatic transmission, with an inner disk carrier (4) and an outer disk carrier (6), with inner disks (3) and outer disks (5) arranged axially in alternation on the disk carriers (4, 6), with friction linings (7) on the inner and/or outer disks (3, 5), with a piston (10) of a pressure-medium-actuated piston-cylinder arrangement such that the inner disks (3) and outer disks (5) can be acted upon by a force to close the multi-disk brake, with an end disk (9) or support disk (11) that forms an axial abutment for the disk set (14) formed by the disks (3, 5, 9, 11), and in which the disk brake (1) and/or the components around it are so configured that the disks (3, 5, 9, 11) can be wetted by a cooling oil.

Abstract: Externally deployed airbag system for a vehicle including one or more inflatable airbags deployable outside of the vehicle, an anticipatory sensor system for assessing the probable severity of an impact involving the vehicle based on data obtained prior to the impact and initiating inflation of the airbag(s) in the event an impact above a threshold severity is assessed, and an inflator coupled to the anticipatory sensor system and the airbag for inflating the airbag when initiated by the anticipatory sensor system. The airbag may be housed in a module mounted along a side of the vehicle, in a side door of the vehicle (both for side impact protection), at a front of the vehicle (for frontal impact protection) or at a rear of the vehicle (for rear impact protection). Also, the externally deployed airbag can be deployed to cushion a pedestrian's impact against the vehicle.

Abstract: A lubrication controlling method for a starting clutch including a wet type multi-plate clutch disposed between a transmission and an engine of a vehicle and adapted to transmit a power, the method including always supplying lubricant oil during an operation of the wet type multi-plate clutch, continuously changing a flow amount of the lubricant oil in accordance with a condition of the wet type multi-plate clutch, and controlling the amount of the lubricant oil so that a supplied amount of the lubricant oil during an idle rotation of the wet type multi-plate clutch is greater than a supplied amount of the lubricant oil during the complete engagement of the wet type multi-plate clutch.

Abstract: A lockup device 7 of a torque converter 1 is formed of a piston 75, a clutch plate 80, and a damper mechanism 9. The clutch plate 80 has a first passage P1 connecting an inner space S3 on the radially inner side to a space S1 formed axially between the front cover 11 and the clutch plate 80, and a second passage P2 connecting the inner space S3 formed on the radially inner side to a space S2 formed axially between the piston and the clutch plate 80.

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: A clutch assembly for an agricultural work vehicle having a piston slidably disposed within a chamber having a first portion and a second portion. The piston is positionable between a first position and a second position in response to a fluid pressure within the first portion of the chamber to actuate a clutch mechanism. A sealing ring is associated with the piston to substantially prevent flow of fluid between the first portion and the second portion when the piston is in the first position. A bleed assembly is configured to permit flow of fluid between the first portion and the second portion when the piston is in the first position. The bleed assembly allows sufficient flow to substantially prevent unintentional engagement of the clutch mechanism.

Abstract: A transmitting apparatus includes a disengaging device that disengages a driving force from a front-wheel differential device to a first driving-force transmitting direction converting unit 20 and a multi-plate clutch mechanism provided between an output of a rear-wheel differential device and a right-rear wheel and capable of successively adjusting a fastening force. Drag torque when the fastening of the multi-plate clutch mechanism is released is set smaller than friction torque of a rear-wheel drive system between the first driving-force transmitting direction converting unit and a second driving-force transmitting direction converting unit. A controller unconnects the disengaging device and releases the fastening of multi-plate clutch mechanism when switching to a two-wheel drive mode, thereby stopping the rotation of the rear-wheel drive system.

Abstract: A PTO clutch includes a lubrication shut-off valve that can slide between a first position blocking a port for lubrication oil to lubricate the PTO clutch, and a second position opening the port to lubricate the clutch. A relief valve is provided in the lubrication shut off valve, which opens in response to pressure spikes of activation oil and isolates the pressure spikes from the clutch piston.

Abstract: An embodiment of a multidisk oil-bath clutch having: a housing mounted to rotate about a longitudinal axis of rotation; at least one hub mounted to rotate about the longitudinal axis of rotation and housed inside and coaxially with the housing; a number of drive disks housed inside the housing and angularly integral with the housing or the hub; a number of driven disks housed inside the housing, alternating with the drive disks, and angularly integral with the hub or the housing; at least one oil inlet into the housing; and at least one oil outlet from the housing. Each drive disk has a number of first circulation channels equally spaced about the longitudinal axis of rotation and extending radially from an inner edge of the drive disk to an outer edge of the drive disk; and each driven disk has a number of second circulation channels equally spaced about the longitudinal axis of rotation and extending radially from an inner edge of the driven disk to an outer edge of the driven disk.

Abstract: A hydraulic system for providing pressure and volume flows in a double-clutch transmission. A first clutch and a second clutch are preceded by at least one changeover valve which, in a first state, guides lubricating flow to the first clutch and cooling flow to the second clutch, and, in a second state, guides lubricating flow to the second clutch and cooling flow to the first clutch. The cooling flow is preferably variable.

Abstract: The invention relates to a hydraulic system (1) for providing pressures and volumetric flows in a dual clutch transmission, in particular for providing a first volumetric flow for cooling and lubricating a first clutch (2) and for providing a second volumetric flow for cooling and lubricating a second clutch (3). The hydraulic system is distinguished by the fact that at least one switching valve (4), which in a first position guides a lubricating flow onto the first clutch (2) and a cooling flow onto the second clutch (3) and in a second position guides the lubricating flow onto the second clutch (3) and the cooling flow onto the first clutch (2), is connected upstream of the first clutch (2) and the second clutch (3). The cooling flow is preferably variable.

Abstract: A clutch assembly for a transmission having a pressurized fluid source includes selectively engageable clutch plates including an apply plate. A piston is movable between an apply position and a release position to respectively engage or release the clutch plates. An apply plate cover cooperates with the apply plate to at least partially form an annular cavity that is sealed to contain pressurized fluid provided by the pressurized fluid source when the piston is moved to the apply position, thereby allowing pressurized fluid flow radially inward across the engaged clutch plates. The annular cavity is opened to allow fluid to empty therefrom when the piston is moved to the released position, thereby allowing centrifugally pumped fluid to flow radially outward across the released clutch plates. A method of reversing cooling fluid flow across clutch plates is also provided.

Abstract: A multiple-disk brake or clutch (1) includes at least one disk (2, 4) in a housing and at least one disk located on a shaft. Coolant is located in the housing (3). A coolant outlet (10) and a coolant inlet (7) of a cooling circuit (9) are located on the housing (3), whereby coolant can be delivered to the coolant outlet (10) by means of the disks (2, 4).

Abstract: A method for cooling a friction shift element of a transmission is proposed, wherein a variable, a constant or the maximum amount of cooling oil is fed to the friction shift element in a time-controlled manner, specifically within an aftercooling phase.

Abstract: A hydrokinetic torque converter with a built-in bypass clutch is provided with an arrangement which regulates the cooling of the clutch at a rate dependent upon the slip between the coaxial driving and driven parts of the clutch, and hence upon the quantity of generated friction heat. The cooling unit for the driving and/or driven part of the clutch can employ, for example, one or more pumps; a supply of a substance which changes its aggregate state from liquid to gaseous or from solid to flowable in response to heating, and vice versa in response to cooling; one or more porous washers in the path for the flow of hydraulic fluid between the customary plenum chambers provided in the housing of the torque converter to move a piston of the driven part of the clutch into and from frictional engagement with the housing; and/or a system of recesses, grooves, channels and/or other passages serving to convey fluid between the chambers at a rate which is higher or highest when the clutch operates with maximum slip.

Abstract: A friction device (10, 110) having a drive member (12, 112) and a driven member (14, 114) which define a clutch housing (16, 116) therebetween. A clutch pack (24, 124) is interposed between the drive and driven members and is operable to connect and disconnect the drive and driven members for transferring and interrupting torque therebetween. A control valve (74, 174) is supported in the clutch housing (16, 116) and is moveable between open and closed positions. The control valve (74, 174) is operable to control the flow of cooling fluid from the source to the clutch pack (24, 124).

Abstract: A control unit associated with the cooling fluid supply switches the flow of cooling fluid on or off by controlling the cooling fluid supply in the course of a respective shifting process in which the transmission is shifted up from a lower gear to a higher gear or in down from a higher gear to a lower gear to deliberately exert inertial forces on at least one of the plate carriers by means of the flow of cooling fluid and, therefore, to act on this plate carrier in an accelerating or decelerating manner or in order to deliberately prevent inertial forces of this type being exerted on at least one of the plate carriers by the flow of cooling fluid.