Abstract: A hybrid module for a drive train of a motor vehicle includes a dual clutch which has a first sub-clutch and a second sub-clutch for selectively transmitting torque from a first drive unit to a drive shaft. The hybrid module further includes a disconnect clutch for coupling a second drive unit and for transmitting torque from the second drive unit to the drive shaft. At least one rotary feedthrough is provided which is configured on one hand for conveying actuating oil, which is designed for actuation of the disconnect clutch, or on the other hand for conveying cooling oil, which is designed for cooling the disconnect clutch and/or the dual clutch.

Abstract: A triple clutch arrangement and a powertrain for a motor vehicle with a dual clutch transmission for use between at least two drive devices and the dual clutch transmission. A first clutch and a second clutch of the triple clutch arrangement are connectable to the first drive device and in each instance to a transmission input shaft. The first drive device and the second drive device are both connected to, or connectable to, a primary side of the first clutch and/or the second clutch via the third clutch.

Abstract: Transmissions and clutch assemblies for transmissions are disclosed herein. A transmission includes an input shaft, an output shaft, and a clutch assembly. The input shaft is configured to receive rotational power. The output shaft is configured to transmit rotational power to a load. The clutch assembly is coupled between the input shaft and the output shaft to selectively transmit rotational power therebetween in use of the transmission. The clutch assembly includes a housing, a piston, and a disc spring. The piston is movable relative to the housing and cooperates with the housing to at least partially define a first cavity that is configured to receive hydraulic fluid such that a first centrifugal pressure force is created in use of the clutch assembly. The disc spring is movable relative to the housing.

Abstract: A lock-up device for a torque converter transmitting a torque from a front cover to a transmission-side member is disclosed. The lock-up device includes a clutch part, a piston, and a return mechanism. The piston is axially opposed to the front cover through the clutch part. The piston is axially movable and applies a pressing force to the clutch part whereby the clutch part is turned to an activated state. The return mechanism urges the piston away from the front cover. The return mechanism is disposed axially between the front cover and the piston while disposed radially inside the clutch part. The return mechanism includes first and second plates, and an elastic member. The first plate contacts the front cover. The second plate contacts the piston while axially opposed to the first plate. The elastic member is disposed between the first and second plates in a compressed state.

Abstract: An automatic transmission assembly for mounting to a power-source includes a torque converter operatively connected to the power-source. The transmission assembly also includes a turbine shaft for receiving power-source torque from the torque converter. The transmission assembly additionally includes a torque transfer system, having a gear-train and a hydraulic pressure operated torque-transmitting device, for receiving the torque from the turbine shaft and selecting an input-to-output speed-ratio of the transmission. The transmission assembly also includes an output member for receiving torque from torque transfer system and outputting the torque to drive a load. The turbine shaft defines a first passage configured to supply hydraulic pressure to the torque-transmitting device and a second passage configured to vent to atmosphere.

Abstract: Transmissions and clutch assemblies for transmissions are disclosed herein. A transmission includes an input shaft, an output shaft, and a clutch assembly. The input shaft is configured to receive rotational power. The output shaft is configured to transmit rotational power to a load. The clutch assembly is coupled between the input shaft and the output shaft to selectively transmit rotational power therebetween in use of the transmission. The clutch assembly includes a housing, a piston, and a disc spring. The piston is movable relative to the housing and cooperates with the housing to at least partially define a first cavity that is configured to receive hydraulic fluid such that a first centrifugal pressure force is created in use of the clutch assembly. The disc spring is movable relative to the housing.

Abstract: A clutch device that includes a first and a second input side, a first and a second output side, wherein the input sides and the output sides can be rotated about a common rotation axis. The clutch device further includes a first clutch between the first input side and the first output side, a second clutch between the first input side and the second output side, a third clutch between the first input side and the second input side, and an actuator device for the third clutch when the second input side rotates faster than the first input side.

Abstract: In an internal combustion engine for a saddle riding vehicle, in which a gear transmission and a shift drum of a shift change device is stored in a crankcase, the gear transmission having a plurality of transmission shafts parallel to a crankshaft extending in a vehicle width direction, a single pump shaft common to first and second oil pumps is rotatably supported by the crankcase. First oil pump rotors of the first oil pump are disposed at a mating face of a pair of left and right crankcase half bodies. A second oil pump rotor of the second oil pump is disposed between a pump gear and the first oil pump and at a side surface, on a side opposite to the mating face, of one crankcase half body out of the pair of left and right crankcase half bodies, the pump gear being arranged in the pump shaft.

Abstract: An automatic transmission is provided, which includes a brake including a hub member which is coupled to a transmission case and includes first and second hub members, a drum member coupled to a given rotary member, friction plates, a piston configured to engage the friction plates, and a valve body disposed in a lower part of the transmission case. The first hub member includes a radially outer circumferential part formed with a first spline part spline-engaged with the transmission case, and a cylindrical part provided at a radially inner circumferential side and formed with a second spline part with which the friction plates are spline-engaged. The second hub member is disposed at a side part of the first hub member, is provided by fitting a radially outer circumferential part of the second hub member to the transmission case, and has a feed part for lubrication.

Abstract: An automatic transmission is provided with a brake including a hub member coupled to a transmission case, a drum member coupled to a given rotary member, friction plates, a piston configured to engage the friction plates, and a hydraulic chamber for engagement disposed radially inward of the hub member and to which hydraulic fluid for biasing the piston in an engaging direction is supplied. The piston includes a pressing part configured to press the friction plates, a hydraulic chamber for engagement forming part, and a coupling part coupling the pressing part to the hydraulic chamber for engagement and extending radially. The hub member includes spline parts with which the friction plates are spline-engaged. Notches are formed by cutting the coupling part of the piston so as to be spaced apart from each other in circumferential directions, and end parts of the spline parts in axial directions enter into the notches.

Abstract: A clutching device of an automatic transmission may include a clutch drum connected to a first rotation element, a clutch connected to the clutch drum and a second rotation element, and a piston device to operate the clutch, wherein the piston device may include a first piston forming a first sealed space with the first rotation element and the clutch drum and moving toward the clutch by a hydraulic pressure supplied to the first sealed space, a second piston forming a second sealed space with the first piston and moving toward the clutch to directly press the clutch by a hydraulic pressure supplied to the second sealed space, a spring retainer disposed on the first rotation element and forming a third space with the second piston and the first rotation element, and a return spring stored in the third space and abutted by the spring retainer and the second piston.

Abstract: A piston assembly for a clutch pack including a piston in form of a ring-shaped plate, a stator connected to the piston, the stator having a circular stator main part and at least one radial protrusion extending radially outwardly from the circular stator main part, each of the at least one radial protrusion of the stator having a first side and a second side, and including a rotor that is connected to the stator, the rotor having a circular rotor main part and at least one radial protrusion extending radially inwardly from the circular rotor main part, each of the at least one radial protrusion of the rotor having a first side and a second side.

Abstract: The present application relates to an implant system, preferably for the sacroiliac joint, comprising an implant body with at least two adjacent apertures, at least two screws and an insertion instrument assembly. Each screw comprises a screw head and a threaded elongated shaft. The at least two screws are rotatably engaged within said at least two apertures. The insertion instrument assembly includes a basis, a first holding means and at least one rotatable driving means configured for engagement with a drive of at least one of said at least two screws. The at least two screws or said insertion instrument assembly comprises transmission means such that a rotational movement of a first screw of said at least two screws is transferred to the at least one further screw.

Abstract: A dual clutch assembly comprises a rotatable second input shaft that surrounds and is concentric with a rotatable first input shaft. A rotatable hub surrounds the first input shaft. A first and a second clutch rotor are connected to the rotatable hub. The first clutch rotor comprises a pulley coupling and a clutch surface. The second clutch rotor comprises a clutch surface. A stationary electromagnetic assembly is mounted between the first clutch rotor and the second clutch rotor. A first armature assembly is coupled to the first input shaft and is configured to couple to the first clutch surface of the first clutch rotor in response to a first electromagnetic signal. A second armature assembly is coupled to the second input shaft and is configured to couple to the clutch surface of the second clutch rotor in response to a second electromagnetic signal.

Abstract: A system for locking and releasing a shifting position of a shifting element that is hydraulically actuatable by an actuating pressure is provided. The shifting element is arranged coaxially with a transmission shaft. The system includes a stop valve. The stop valve is subjectable to a control pressure that is separate from the actuating pressure of the shifting element. The stop valve is arranged radially inside the shifting element in the transmission housing.

Abstract: A clutch mechanism intended to be installed between an engine and a transmission of a motor vehicle. The clutch mechanism is configured to be installed on the transmission (400) in two steps and by means of an axial locking system for axial locking of the control system (300) with respect to a clutch (100, 200). The axial locking system comprises a first axial locking element (304, 402) for implementing at least an axial retention between the control system (300) and the transmission (400), and a second axial locking element (600) for implementing at least an axial retention between the clutch (100, 200) and a shaft (A1, A2) of the transmission, and a means for rotational coupling of a clutch support (500) with respect to the control system (300), the rotational coupling means being different from the axial locking system.

Abstract: A torque transmission module (M) intended to be part of a motor vehicle transmission (1), comprising: a cover (10), a double wet clutch mechanism (11) movable rotationally around an axis (X), and a clutch cover (12) having an oil distribution device intended to supply oil to the double wet clutch, the cover (10) and the clutch cover (12) being assembled so as to form a casing defining a receptacle in which the double wet clutch mechanism is partly received, the casing being able to be received entirely or in part in a clutch housing (5) of the transmission.

Abstract: A transmission comprising at least a first shaft and at least a second shaft parallel thereto, comprising a first gear wheel and a second gear wheel arranged on the first and second shafts, respectively, the first gear wheel of said first shaft and the second gear of the second shaft arranged as a gear wheel pair and meshing with each other, wherein the first gear wheel of the gear wheel pair is non-rotatably fixed to the first shaft and the second gear wheel of the gear wheel pair is rotatably arranged on the second shaft, an axially displaceable shifting collar for fixing the second gear wheel against rotation relative to the second shaft, an axially displaceable selector fork for actuating the shifting collar and, a damping element arranged on the selector fork and is able to engage a transmission element.

Abstract: A transmission device has at least one electro-hydraulic transmission control unit and a method of operating the transmission device having a plurality of gear wheel that can be engaged and disengaged from a force flow by fluidically actuated shifting elements. A piston space of a first shifting element, delimited by a second functional surface of the actuating piston of the first shifting element, is made separate from a piston space of a second shifting element, delimited by the first functional surface of the actuating piston, and an area of the second shifting element, that carries an actuating pressure, or an area of the first shifting element, that carries an actuating pressure, is, or can be, connected to the piston space delimited by the second functional surface of the actuating piston of the first shifting element.

Abstract: A shift control method for a dual clutch transmission (DCT) vehicle may include, performed by a controller of the DCT, an actual shift determining step, a cooperation control termination determining step, a flare determining step, an engine torque reducing step, a torque adding step, an engine torque raising step, and a shift finishing step of reducing an amount of reduction of the engine torque until synchronization is completed in proportion to a synchronization prediction time in which it takes an engine speed to reach a synchronization speed when the synchronization prediction time is smaller than a reference time during which the torque adding step and the engine torque raising step are performed, and having slip control over an engagement-side clutch.

Abstract: A hydraulic system for a double piston includes a double piston that includes an operation piston with a first operation side and a second operation side, a first piston port for supplying hydraulic pressure to the first operation side, and a second piston port for supplying hydraulic pressure to the second operation side, a solenoid valve that receives a clutch control pressure and communicates with the first piston port through a first channel, a switch valve that receives the clutch control pressure from the solenoid valve, may be connected with the second piston port through a second channel, and selectively transmits the clutch control pressure to the second piston port, and a manual valve that receives a line pressure and selectively transmits the line pressure to the switch valve such that the clutch control pressure may be selectively transmitted to the second operation side through the second channel.

Abstract: A vehicle includes a prime mover, transmission, and controller. The transmission, e.g., a DCT or 8-speed automatic transmission, includes an input member, an output member, gear sets, and a plurality of clutches. The controller monitors the transmission for a threshold tie-up condition via a method, which includes processing clutch control input signals and a gearbox status signal to identify the clutches involved in a present operating mode of the transmission, e.g., a shift, neutral, or fixed gear. The controller determines the torque capacity of each involved clutch, compares the determined clutch torque capacities to respective calibrated clutch torque capacities, and executes a control action in response to a threshold tie-up condition. The threshold tie-up condition is present when the determined clutch torque capacities exceed the calibrated clutch torque capacity for at least one of the involved clutches for longer than a calibrated duration.

Abstract: A clutch arrangement for a drivetrain of a vehicle comprises a first friction surface, a second friction surface, a pressing element and a sealing element. The second friction surface is coupled to an output component of the clutch arrangement to be substantially fixed with respect to rotation relative to the output component. The first and second friction surfaces are configured and arranged to be brought into frictional engagement with each other to make a torque transmittable from the first friction surface to the second friction surface. The first and second friction surfaces are further configured to be exposed to a fluid medium. The pressing element is configured to produce or sever the frictional engagement by causing a force along a force direction when actuated. The sealing element is configured to separate a first volume in which the first and second friction surfaces are arranged from a second volume.

Abstract: A parallel double-clutch device is arranged in a drivetrain of a motor vehicle between a drive unit and transmission of the drivetrain. The device comprises a first clutch arrangement assigned to a first transmission-input shaft for selectively transmitting torque between the drive unit and first transmission-input shaft. A second clutch arrangement is assigned to a second transmission-input shaft for selectively transmitting torque between the drive unit and second transmission-input shaft. The first clutch arrangement can be actuated by at least one hydraulically drivable first actuating piston assigned a first pressure chamber delimited by a first pressure-chamber housing and the first actuating piston. The second clutch arrangement can be actuated by at least one hydraulically drivable second actuating piston assigned a second pressure chamber delimited by a second pressure-chamber housing and the second actuating piston.

Abstract: A transmission assembly may include a first clutch and a second clutch. The second clutch may include a clutch pack, a pressure chamber, a first piston, and a second piston. The first piston may be configured to push against the clutch pack when pressurized fluid is directed into the pressure chamber. The second piston may be configured to push against the first piston when pressurized fluid is directed into the pressure chamber at a time when the first clutch is unactuated and inhibited from pushing against the first piston at a time when the first clutch is actuated.

Abstract: A hydraulic pressure clutch includes a first connecting hub on an input shaft, an inner sleeve, a boss, an outer sleeve, a clutch drum, a second connecting hub, a first piston forming a first piston chamber together with the second connecting hub, first clutch plates disposed on an outer protrusion and selectively pushed by the first piston along an axial direction, first friction disks disposed alternately with the first clutch plates, a first balance wall forming a first balance chamber, a second piston forming a second piston chamber, second clutch plates selectively pushed by the second piston along an axial direction, second friction disks disposed alternately with the second clutch plates, and a second balance wall forming a second balance chamber, wherein the first piston penetrates through the outer protrusion for pushing the first clutch plates.

Abstract: The present invention relates to a parallel dual clutch unit (2) for arrangement in a drivetrain of a motor vehicle between a drive unit (4) and a transmission (6), which comprises a first multi-plate clutch (30) assigned to a first transmission input shaft (10) and having a first plate pack (38), a first inner plate carrier (36) and a first outer plate carrier (34) for selective torque transmission between the drive unit (4) and the first transmission input shaft (10), and a second multi-plate clutch (32) assigned to a second transmission input shaft (12) and having a second plate pack (44), a second inner plate carrier (42) and a second outer plate carrier (40) for selective torque transmission between the drive unit (4) and the second transmission input shaft (12), the first inner plate carrier (36) being embodied as input side and the first outer plate carrier (34) as output side of the first multi-plate clutch (30), while the second inner plate carrier (42) is embodied as output side and the second outer

Abstract: A clutch apparatus includes a clutch pack having a plurality of friction disks. The clutch pack will selectively transfer torque from a torque supplying member to a first torque receiving member. The apparatus also includes a first piston chamber positioned radially outward of the clutch pack. The first piston chamber is operably connected to the clutch pack for exerting a compressive force on at least a portion of the clutch pack as a first fluid is pressurized into the first piston chamber.

Abstract: A dual shift coupling including two operatively connected coupling units mounted on a shared, integrally formed inner body in a rotationally fixed and axially movable manner. Further, a multi-part pressure disk is arranged between the coupling units in an axially fixed manner and is supported by the inner body, and has two axially movable pressure pistons ventilated by respective pressure spring assemblies arranged in the inner body. A radial notch for accommodating the pressure disk is provided in the inner body, wherein the radial depth of the notch extends at least to radial inner wall segments of recesses for the pressure spring assemblies. Each pressure spring assembly has a plurality of pressure springs which rest on the inner side of the pressure disk relative to the axis.

Abstract: A hydraulic pressure clutch includes a first connecting hub including first, second, and third oil holes, a transmission case having first, second, and third oil supply portions, an inner sleeve having first, second, and third oil passages, a boss having fourth, fifth, and sixth oil passages, an outer sleeve having seventh and eighth oil passages, a clutch drum, a second connecting hub, a first piston forming a first piston chamber, a plurality of first clutch plates, a plurality of first friction disks disposed alternately with the first clutch plates, a first balance wall forming a first balance chamber, a second piston forming a second piston chamber, a plurality of second clutch plates, a plurality of second friction disks disposed alternately with the second clutch plates, and a second balance wall forming a second balance chamber, wherein the first and second balance chambers are supplied simultaneously through one oil line.

Abstract: An apparatus for transmitting power to a transmission input includes first and second sources of rotary power, first and second transmission input shafts, a clutch hub driveably connected to the first and second power sources, and first and second clutches secured to the clutch hub, for alternately closing and opening a drive connection between the first and second transmission input shafts and the clutch hub.

Abstract: An assembly including an input including first, second, third and fourth passages, a shaft surrounding the input, a housing including a hub surrounding the shaft, a first path connecting the first passage to a first servo cylinder, a second path connecting the second passage to a second servo cylinder, a third path connecting the third passage to balance volumes, and a fourth path connecting the fourth passage to a third servo cylinder, bypassing the hub.

Abstract: A friction device assembly structure for an automatic transmission includes a first friction device and an end play adjustment element. The first friction device includes a plurality of discs and a plurality of plates which are alternately arranged and configured such that a frictional force is created between the discs and the plates by the pressing force of a piston. The end play adjustment element is provided on an end of the first friction device to adjust an end play defined between the first friction device and the piston. The end play adjustment element is hollow such that an inner diameter thereof is greater than an outermost diameter of a second friction device which is provided inside the first friction device. Thereby, the end play adjustment element is able to be assembled without any interference from the second friction device.

Abstract: A lubricating oil passage 113 includes an upstream oil passage 113a defined coaxially in a rotational shaft 71 for supplying lubricating oil to lubricated parts and a downstream oil passage 113b connected to the upstream oil passage 113a for supplying lubricating oil to canceler chambers 97, 107. The downstream oil passage 113b may be smaller in diameter than the upstream oil passage 113a and having at least a portion extending parallel to the axis of the rotational shaft 71. Control oil passages 111, 112 which have axes parallel to the axis of the rotational shaft 71 are defined in the rotational shaft 71 such that at least a portion of the control oil passages 111, 112 is disposed in a range wherein the downstream oil passage 113b is provided in a direction along the axis of the rotational shaft 71.

Abstract: A dual-clutch transmission with individual clutches, which are axially arranged one behind the other and are hydraulically actuated, with one drive-side individual clutch, one gearbox-side individual clutch, one drive-side clutch housing and two cylinder/piston pairs, whereby the first of the individual clutches connects by switch the clutch housing with one of the first gearbox input shafts and the second of the individual clutches connects by switch the clutch housing with one of the second gearbox input shafts, whereby the clutch housing is connected drive-side with a drive shaft and gearbox-side with internally arranged input lamellae supports relating to the single clutches and torque conducted to the dual-clutch transmission via the clutch housing can be conducted to both individual clutches, whereby the clutch housing supports an actuating force from the gearbox-side single clutch and a second support area supports the actuating force from the drive side clutch is provided.

Abstract: A narrow double clutch transmission to be mounted in a drive train with a drive unit comprises a clutch part and a transmission part with two sub-transmission units. The clutch part has one input hub connected with the drive unit and two output hubs, which are connected with two input shafts of two sub-transmission unit respectively. The two sub-transmission unit input shafts are arranged coaxially to each other. At the output side the input hub is connected with a damping mechanism, which is connected with two clutches. The two clutches and the damping mechanism are arranged in a clutch chamber filled with oil, which is sealed floatingly to a clutch cover. The output hub connected with the sub-transmission input shaft is axially supported by the sub-transmission unit input shaft.

Abstract: A hydraulic clutch for preventing a drag of a clutch at the time of disengaging the clutch by decreasing an oil supply quantity between a plurality of clutch plates and a plurality of clutch discs thus decreasing a change hitting sound at the time of shifting. A hydraulic clutch is configured such that the superposition between an oil supply hole formed in a clutch pressure plate and an oil supply hole formed in a clutch center becomes maximum when the clutch is engaged.

Abstract: A torque transmission assembly is disposed between a power source and a vehicle transmission and includes an annular housing, a pump member of a fluid coupling, a turbine member of the fluid coupling, a lockup clutch, a first shaft, a first selectable clutch, a second shaft, and a second selectable clutch. The turbine member opposes the pump member and the lockup clutch is selectively engaged between the pump member and the turbine member. The first selectable clutch is selectively engaged between the turbine member and the first shaft. The second selectable clutch is selectively engaged between the turbine member and the second shaft.

Abstract: A dual clutch which has two friction clutches, a central pressure-exerting plate and two pressure plates which are axially movable relative to the pressure-exerting plate with the interposition of the friction linings of two clutch disks, which each mesh with one gearbox input shaft, of actuating devices. The dual clutch is held at the drive-input side, with the dual clutch being supported at the gearbox side by an actuating system, which holds the two actuating devices, for actuating the pressure plates, and with the actuating system being rotatably held on the clutch housing.

Abstract: An engine includes a crankshaft for transmitting rotational drive power to a drive wheel, a clutch mechanism for connecting or disconnecting the transmission of rotational drive power of the crankshaft, and clutch actuators. The crankshaft, clutch mechanism, and clutch actuators are accommodated in an engine case. The clutch actuators control the clutch mechanism and are positioned outside the clutch mechanism, viewed from the crankshaft direction.

Abstract: A clutch apparatus includes a first clutch pack having a plurality of first friction disks. The first clutch pack will selectively transfer torque from a torque supplying member to a first torque receiving member. The apparatus also includes a second clutch pack having a plurality of second friction disks. The second clutch pack will selectively transfer torque from a torque supplying member to a second torque receiving member. The apparatus also includes a first rotating manifold having a first cooling inlet for directing a cooling fluid to the first clutch pack. At least a portion of the first rotating manifold is coupled for rotation with at least a portion of the first friction disks. The apparatus also includes a second rotating manifold having a second cooling inlet for directing a cooling fluid to the second clutch pack. At least a portion of the second rotating manifold is coupled for rotation with at least a portion of the second friction disks.

Abstract: A flexplate coupling is disclosed. The flexpate coupling may be used as part of a transmission. The flexplate coupling comprises a flywheel, a damper assembly including a hub portion, and a flexplate. The flexplate includes a hub fastened to the hub portion of the damper assembly and a peripheral portion fastened to the flywheel.

Abstract: A hybrid drive train (1) has an electric machine (15) with a stator (16) fastened to a clutch housing (18) and a rotor (20) that can be rotated relative to the stator (16) with a radial gap (22) therebetween. The hybrid drive train (1) also has a wet-running multiple disk clutch device (8) with an outer multiple disk carrier (24) that has at least one oil passage opening (41). The radial gap (22) between the rotor (20) and the stator (16) is shielded from the oil passage opening (41) of the outer multiple disk carrier (24) by an oil shielding device (50).

Abstract: A housing for a multi-stage clutch assembly is formed to include a shoulder upon which a backing plate of a first stage clutch pack may be positioned to transfer a load from the first stage clutch pack to the housing.

Abstract: A power transmitting apparatus can comprise a plurality of gear stage clutches arranged on the way of a power transmitting path between an engine and the wheels. Each of the gear stage clutches include alternately arranged driving clutch discs and driven clutch discs, hydraulic pistons actuated by hydraulic oil to selectively engage or disengage the driving clutch discs and driven clutch discs, hydraulic chambers for actuating the hydraulic pistons, and supplying ports communicating with oil passages formed within the input shaft and opening on the side surface of the input shaft for supplying the hydraulic chambers with hydraulic oil from the oil passages to actuate the hydraulic pistons. A plurality of the supplying ports can be formed on a same plane of a radial cross-section of the input shaft.

Abstract: A clutch can comprise driving clutch plates spline-fitted on an input member, driven clutch plates arranged alternately with the driving clutch plates and spline-fitted on an output member, a clutch piston having one surface facing an oil pressure chamber and another surface facing the clutch plates and adapted to be displaced toward the plates by supplying oil to the oil pressure chamber and to be returned by discharging the oil from the chamber. A valve can pass through the clutch piston and be adapted to be closed for preventing oil from exiting the chamber to the other side of the clutch piston when the clutch is clutched-on and to be opened and allow airflow to the oil pressure chamber when the clutch is clutched-off. One or more weight reduction recesses can be formed on one surface of the clutch piston near the outer circumference further radially outward than the valve.

Abstract: A double clutch transmission having a wet-running double clutch, a dual mass flywheel and a centrifugal force pendulum. The dual mass flywheel is arranged in a dry chamber between a drive and the double clutch and the centrifugal force pendulum is arranged in a wet chamber of the double clutch.

Abstract: A clutch control apparatus for receiving an air flow more easily and to obtain a higher cooling performance in a power unit for a saddle-ride type vehicle while avoiding the size of the main engine body becoming larger in the front-and-rear direction. The power unit includes a clutch apparatus installed in a clutch chamber. The clutch apparatus is disposed in the course of power transmission from a crankshaft to a drive wheel. The clutch chamber is formed between a crankcase and a clutch cover that is coupled to a side surface of the crankcase. A clutch control apparatus that controls the switching of the connection and disconnection actions of a clutch apparatus is attached to the outer surface of a clutch cover in a position at a side of a cylinder block.

Abstract: In a twin clutch device used in an engine transmission, there are coaxially and adjacently arranged a first disk clutch and a second disk clutch of a hydraulic pressure type that displace a pressing member in an axial direction with externally supplied hydraulic pressure to exert a predetermined engagement force; and the first disk clutch and the second disk clutch respectively have: an engagement side hydraulic chamber that gives the pressing member a pressing force towards a clutch engagement side; and a pressure compensation hydraulic chamber that gives the pressing member a pressing force towards a clutch disengagement side to compensate a pressure of a returning action thereof.

Abstract: A force transmission device having a hydrodynamic component, disposed between an input and an output, comprising at least a pump shell and a turbine shell, forming an operating cavity in combination, with an actuatable clutch device for at least partially bridging the hydrodynamic component, comprising a clutch component for at least partially bridging the hydrodynamic component, comprising a first clutch component connected with the input and a second clutch component at least indirectly connected to the output, which can be brought into operative engagement with one another through an actuation device, with a vibration absorber disposed in the force flow at least subsequent to the actuatable clutch device, with a housing coupled with the input or with an element coupled non-rotatably to the input and coupled with the pump shell.