Abstract: A friction clutch with a pressure plate 6, which is mounted nonrotatably but with freedom of axial movement in a clutch housing 5, this pressure plate 6 being actuated by a pressure spring 7 in the direction toward a clutch disk 8, which can be clamped between the pressure plate 6 and an opposing pressure plate 1. More-or-less radially pretensioned friction springs 18 of a friction damping device are installed between the pressure plate 6 and a component with respect to which the pressure plate 6 can move in the axial direction. The friction springs 18 are mounted on spacer bolts 12, which project axially from the clutch housing 5, these bolts passing through corresponding openings 23 in a diaphragm spring, which serves as the pressure spring 7, the diaphragm spring being mounted on the spacer bolts 12 in such a way that its plane can be tilted.

Abstract: A start-up clutch assembly (10) for translating torque between a prime mover and a transmission includes a drive member (16) and a clutch pack (30) is supported between the drive (16) and driven members (24). The clutch pack (30) is operable to move between a closed pack mode and an open pack mode to connect and disconnect the drive and driven members (16, 24) to selectively transfer and interrupt torque translation therebetween. A torque apply piston assembly (54) is operable to move between a disengaged position to connect and disconnect the drive and driven members and to provide a constant biasing force so that the clutch pack (30) normally operates in the closed pack mode to translate torque between the drive and driven members (16, 24).

Abstract: A pressing force transmission plate (126) for a friction clutch comprises an annular plate body (150) and at least one impingement area (152) for the introduction of a force exerted by an energy accumulator (130), preferably a diaphragm spring, wherein the plate body (150) and impingement area (152) are flexibly connected by a connection area (154), and wherein the plate body (150) and impingement area (152) form a leg spring arrangement.

Abstract: A clutch assembly includes a diaphragm spring to bias a retainer assembly toward an engaged position. The retainer assembly actuates a lever to force a pressure plate into torque transmitting contact with a friction disc and a flywheel. Clutch straps bias the pressure plates toward a disengaged position. An adjusting ring shifts toward the flywheel to accommodate for wear of the friction disc. A resilient plate is attached to the adjusting ring and exerts a biasing force against the diaphragm spring. As the adjuster ring shifts toward the flywheel, the biasing force of the clutch straps increases and the biasing force of the resilient plate decreases to provide a substantially uniform clamp load throughout the life of the friction disc.

Abstract: A friction clutch includes a housing arrangement having an axis of rotation and an intermediate plate arrangement coupled to the housing arrangement for joint rotation therewith about an axis of rotation. The intermediate plate arrangement is arranged to transmit a pressure force and is preferably arranged between two frictional output members. The intermediate plate arrangement has two intermediate plate elements and an elastic prestressing arrangement therebetween. The two intermediate plate elements being displaceable with respect to one another counter to the action of the elastic prestressing arrangement.

Abstract: A friction clutch assembly that is adapted particularly for use in a powertrain for a vehicle for controlling transfer torque to traction wheels for the vehicle. The torque capacity of the clutch assembly is modified by adjusting the effective clutch engaging force. Pressure balance springs oppose a primary clutch spring engaging force. The compression distance of the pressure balance springs is controlled to achieve an effective clutch engaging force that accommodates varying operating torque requirements.

Abstract: A housing arrangement can be connected to a flywheel for rotation in common around an axis of rotation, and a pressure element is connected to the housing arrangement for rotation in common around the axis of rotation but is able to shift in the axial direction. A release spring arrangement includes at least one spring element which acts on the pressure element and is supported against the flywheel after the housing arrangement has been attached to the flywheel. Each spring element is held in place on the pressure element by means of a fastening element.

Abstract: A friction clutch includes a housing arrangement connectable to a drive element for rotation in common about an axis of rotation, a plurality of first friction disks connected to the housing arrangement such that the first friction disks are fixed with respect to rotation and axially movable relative to the housing arrangement, a hub rotatable about the axis of rotation relative to the housing arrangement and having a plurality of radially outward-projecting connection arms, a plurality of second friction disks defining engagement opening therein being closed on radial inner sides thereof, wherein the connection arms of the hub engage the engagement openings of the second friction disks such that the second friction disks are fixed with respect to rotation and axially movable relative to the hub, and a force-exerting arrangement exerting a force for urging the first friction elements and the second friction elements into contact with each other

Abstract: A friction clutch includes a housing arrangement connectable to a drive element for rotation in common about an axis of rotation, a pressure plate connected to the housing arrangement such that the pressure plate is fixed with respect to rotation relative to the housing arrangement and axially movable relative to the housing arrangement, a force-exerting arrangement acting on a first axial side of the pressure plate to produce the engaged state of the friction clutch, and a friction disk connected to the housing arrangement such that the friction disk is fixed with respect to rotation relative to the housing arrangement and is axially movable relative to the housing arrangement. The friction disk has a ring-shaped friction lining carrier on which the second axial side of the pressure plate acts in the engaged state. The friction lining carrier carries at least one friction lining element on the axial side facing away from the pressure plate.

Abstract: A start-up clutch assembly (10) for translating torque between a prime mover and a transmission includes a drive member (16) and a clutch pack (30) is supported between the drive (16) and driven members (24). The clutch pack (30) is operable to move between a closed pack mode and an open pack mode to connect and disconnect the drive and driven members (16, 24) to selectively transfer and interrupt torque translation therebetween. A torque apply piston assembly (54) is operable to move between a disengaged position to connect and disconnect the drive and driven members and to provide a constant biasing force so that the clutch pack (30) normally operates in the closed pack mode to translate torque between the drive and driven members (16, 24).

Abstract: A torque transmission system for the transmission of torque between a prime mover and a gearbox in a vehicle includes an input shaft, which can rotate around a first axis of rotation; at least one output shaft, which can rotate around a second axis of rotation transversely offset from the first axis of rotation; and a first clutch arrangement with an output area, which is or can be connected nonrotatably to the output shaft, and an input area, which can be connected as desired to the output area for the transmission of torque. A drive arrangement connects the input shaft to the input area so that the input area can be caused to rotate by the input shaft.

Abstract: A friction clutch assembly that is adapted particularly for use in a powertrain for a vehicle for controlling transfer torque to traction wheels for the vehicle. The torque capacity of the clutch assembly is modified by adjusting the effective clutch engaging force. Pressure balance springs oppose a primary clutch spring engaging force. The compression distance of the pressure balance springs is controlled to achieve an effective clutch engaging force that accommodates varying operating torque requirements.

Abstract: A transport-securing arrangement for a pressure plate assembly of a multi-disk clutch including a housing arrangement connectable to a flywheel, a pressure plate coupled to the housing arrangement for common rotation therewith, a stored-energy device having one side supported on the housing arrangement and another side supported on the pressure plate arrangement. The pressure plate assembly also includes an intermediate plate connected to the housing arrangement for common rotation therewith and a first clutch disk with a friction surface area positioned between the pressure plate and the intermediate plate. The transport-securing arrangement comprises a plurality of connecting elements, preferably bolt elements, for tightly connecting the intermediate plate to the housing arrangement.

Abstract: A friction clutch includes a housing having an axis of rotation; a pressure plate connected to the housing for rotation in common; a force exerting arrangement supported against the housing and the pressure plate; an actuator mechanism which acts on the force exerting arrangement to load the pressure plate axially with respect to the housing; and a bearing arrangement for supporting the actuator mechanism axially with respect to the housing so that it is prevented from moving in either axial direction.

Abstract: A friction clutch with a pressure plate 6, which is mounted nonrotatably but with freedom of axial movement in a clutch housing 5, this pressure plate 6 being actuated by a pressure spring 7 in the direction toward a clutch disk 8, which can be clamped between the pressure plate 6 and an opposing pressure plate 1. More-or-less radially pretensioned friction springs 18 of a friction damping device are installed between the pressure plate 6 and a component with respect to which the pressure plate 6 can move in the axial direction. The friction springs 18 are mounted on spacer bolts 12, which project axially from the clutch housing 5, these bolts passing through corresponding openings 23 in a diaphragm spring, which serves as the pressure spring 7, the diaphragm spring being mounted on the spacer bolts 12 in such a way that its plane can be tilted.

Abstract: In a clutch device 1, a second flywheel assembly 5 is axially movable within a predetermined range relative to a crankshaft 2, and a flywheel 21 has a friction surface 21a on a side remote from an engine. The damper mechanism 6 elastically couples the flywheel 21 to the crankshaft 2. The clutch disk assembly 9 has a friction facing 54 neighboring the first friction surface 21a. The clutch cover assembly 8 is attached to the flywheel 21, and biases the friction facing 54 toward the first friction surface 21a. The release device 10 applies an axial load directed toward the engine to the clutch cover assembly 8, and thereby releases the load toward the friction facing 54. The relative rotation suppressing mechanism 24 couples the second flywheel assembly 5 to the disk-like member 13 when the clutch cover assembly 8 receives the axial load directed toward the engine.

Abstract: A clutch assembly includes a diaphragm spring to bias a retainer assembly toward an engaged position. The retainer assembly actuates a lever to force a pressure plate into torque transmitting contact with a friction disc and a flywheel. Clutch straps bias the pressure plates toward a disengaged position. An adjusting ring shifts toward the flywheel to accommodate for wear of the friction disc. A resilient plate is attached to the adjusting ring and exerts a biasing force against the diaphragm spring. As the adjuster ring shifts toward the flywheel, the biasing force of the clutch straps increases and the biasing force of the resilient plate decreases to provide a substantially uniform clamp load throughout the life of the friction disc.

Abstract: In a clutch in which an end wall of a clutch housing made of an iron and a retainer plate secured to the end wall are connected with a transmitting gear made of an iron and disposed between the end wall and the retainer plate for rotation relative to each other in the predetermined range of angle, damper springs and belleville springs for urging the transmitting gear toward the retainer plate are interposed between the end wall as well as the retainer plate and the transmitting gear, and a thrust washer is mounted to an outer surface of the end wall of the clutch housing for preventing the contact of the end wall and the belleville springs; detent bores are provided in the end wall of the clutch housing, and detent claws are formed on a thin thrust washer to be engaged into the detent bores. Thus, the relative rotation of the clutch housing and the thrust washer relative to each other is prevented, while providing a good assemblability of the clutch.

Abstract: An object of the invention is to suppress an increase in an inner diameter of a friction facing of a clutch disk assembly, which may be caused by fixing portions of a plate member pair of a clutch disk assembly 1. The clutch disk assembly 1 is provided to couple to a flywheel 2 of an engine. The clutch disk assembly 1 includes a friction facing 20, a pair of plates 15 and 16, a hub 8, and coil springs 11. The plates 15 and 16 have fixing portions 34 fixing their outer peripheral portions together. The coil springs elastically couple the paired plates 15 and 16 to the hub 8 in the rotating direction. The fixing portions 34 project radially outward beyond the inner periphery of the friction facing 20.

Abstract: A torque head for gripping tubular members, in at least some aspects, has a housing, grip mechanism secured within the housing, the grip mechanism for selectively gripping a tubular member, the grip mechanism including at least one jaw selectively movable toward and away from a portion of a tubular member within the housing, the at least one jaw having mounted thereon slip apparatus for engaging the portion of the tubular member, the slip apparatus including die apparatus movably mounted to the at least one jaw, the die apparatus movable with respect to the at least one jaw so that relative movement of the tubular with respect to the torque head is possible to the extent that the die apparatus is movable.

Abstract: Friction clutch for use in the drive train of a motor vehicle with an input part, a clutch housing, at least one clutch disk in working connection with a takeoff element, and a pressure plate working together with the input part, the force of a stored-energy element acting on the pressure plate to transmit torque to the clutch disk. The radially outer area of the input part has axially oriented walls extending along at least part of the circumference to cooperate with the pressure plate.

Abstract: A transport-securing arrangement for a pressure plate assembly of a multi-disk clutch including a housing arrangement connectable to a flywheel, a pressure plate coupled to the housing arrangement for common rotation therewith, a stored-energy device having one side supported on the housing arrangement and another side supported on the pressure plate arrangement. The pressure plate assembly also includes an intermediate plate connected to the housing arrangement for common rotation therewith and a first clutch disk with a friction surface area positioned between the pressure plate and the intermediate plate. The transport-securing arrangement comprises a plurality of connecting elements, preferably bolt elements, for tightly connecting the intermediate plate to the housing arrangement.

Abstract: In order to minimize an effect of centrifugal force on a release operation of a clutch piston, this invention provides a return apparatus including a spring support rotating at a same speed as the clutch piston, and a return spring abutted at an end against the spring support and exerting an elastic force on the clutch piston, the elastic force increasing as the clutch piston rotating speed increases.

Abstract: A diaphragm clutch mechanism for a motor vehicle engine having a friction lining adapted to be clamped with an annular diaphragm between a reaction plate and a pressure plate. A cover fixed to the reaction plate and integral in rotation with the pressure plate which is also mobile in axial translation relative to the reaction plate, and an assist mechanism includes a Belleville washer which co-operates with the diaphragm so that the load exerted on the pressure plate should be substantially constant whatever the degree of wear of the friction lining when the clutch mechanism is in engaged position. The assist Belleville washer is supported on the diaphragm or on the cover that forms a front stop. The assist Belleville washer is supported on a rear stop borne by the cover so as to be slightly stressed when the clutch mechanism is in the released position.

Abstract: In a clutch in which an end wall of a clutch housing made of an iron and a retainer plate secured to the end wall are connected with a transmitting gear made of an iron and disposed between the end wall and the retainer plate for rotation relative to each other in the predetermined range of angle, damper springs and belleville springs for urging the transmitting gear toward the retainer plate are interposed between the end wall as well as the retainer plate and the transmitting gear, and a thrust washer is mounted to an outer surface of the end wall of the clutch housing for preventing the contact of the end wall and the belleville springs; detent bores are provided in the end wall of the clutch housing, and detent claws are formed on a thin thrust washer to be engaged into the detent bores. Thus, the relative rotation of the clutch housing and the thrust washer relative to each other is prevented, while providing a good assemblability of the clutch.

Abstract: A clutch apparatus 1 includes a clutch cover assembly 8 and a damper mechanism 24. The clutch cover assembly 8 includes a pressure plate 51, a clutch cover 28, and a cone spring 52. The damper mechanism 24 includes elastic members 30 that are retained by a crankshaft 2 or the clutch cover assembly 8 and axially releasably engages the other. A release mechanism 10 includes a cover member 57, a release member 60, and a lever member 59. The inner peripheral end of the cover member 57 is supported by a member disposed on a transmission side. The release mechanism 10 moves the plate 51 away from the clutch disk 82 by applying a load to the assembly 8. The relative rotation limiting mechanism connects the assembly 8 to a member disposed on the crankshaft side by the load applied from the release mechanism 10 to the assembly 8.

Abstract: A first clutch area produces a first torque-transmitting connection between a drive element and a first driven element, and a second clutch area produces a second torque-transmitting connection between the drive element and a second driven element. A common engaging/disengaging mechanism actuates the first clutch area and the second clutch area to produce and to nullify the first and second torque-transmitting connections.

Abstract: Pivot point release load adjuster assembly for use in a pull type angle spring clutch pressure plate assembly having a pair of pins connected to the housing end, a cradle swivelingly disposed on the said pins, a pressure spring seat swivelingly disposed on the release sleeve retainer pins and a pressure spring located between the cradle on said housing end and the pressure spring seat on said release sleeve retainer end. The cradle is operatively positioned on the said pins thereby enabling the cradle to swivel about a pivot point at a distance, between the said pressure spring seat and the said pivot point. The assembly is adapted to operatively adjust such pivot point away from the seat of the pressure spring towards the sleeve retainer end of the pressure spring whereby the desired lever ratio is achieved.

Abstract: A pressure plate subassembly for a friction clutch includes a housing connectable to an abutment arrangement for joint rotation about an axis of rotation, a pressure plate arranged in the housing so that the pressure plate is rotatable together with the housing about the axis of rotation (A) and so that the pressure plate is displaceable relative to the housing in the direction of the axis of rotation, and a force accumulator for generating a pressure force, the force accumulator being supported on the housing and on the pressure plate. The force accumulator is arranged outside the housing.

Abstract: A friction clutch wherein a pressure plate is axially movably but non-rotatably coupled to a cover and is biased by a diaphragm spring to urge the friction linings of a clutch disc against a flywheel which is driven by the engine of a motor vehicle. The diaphragm spring is tiltable relative to a seat which is carried by the cover, and a second spring is provided to bias a portion of the seat against the diaphragm spring. The latter can be moved axially of the flywheel to compensate for wear upon the friction linings, particularly when the flywheel is idle or is driven at a relatively low speed.

Abstract: Friction clutch for use in the drive train of a motor vehicle with an input part, a clutch housing, at least one clutch disk in working connection with a takeoff element, and a pressure plate working together with the input part, the force of a stored-energy element acting on the pressure plate to transmit torque to the clutch disk. The radially outer area of the input part has axially oriented walls extending along at least part of the circumference to cooperate with the pressure plate.

Abstract: A friction clutch wherein a pressure plate is axially movably but non-rotatably coupled to a cover and is biased by a diaphragm spring to urge the friction linings of a clutch disc against a flywheel which is driven by the engine of a motor vehicle. The diaphragm spring is tiltable relative to a seat which is carried by the cover, and a second spring is provided to bias a portion of the seat against the diaphragm spring. The latter can be moved axially of the flywheel to compensate for wear upon the friction linings, particularly when the flywheel is idle or is driven at a relatively low speed.

Abstract: In a pressure type differential limiting clutch, a drive plate and a driven plate provided between a clutch drum for transmitting a driving force to a front drive shaft and a clutch hub for transmitting the driving force to a rear drive shaft are pressed by a pressure force of a cone disk spring provided in a pressure plate, and an initial torque by the cone disk spring acts as the differential limiting torque. At a high speed, a weight in limiter device is moved in a radius direction by a centrifugal force through rotation of the rear drive shaft, enters between cam surfaces formed on the pressure plate and the clutch hub, and pushes and broadens. As a result, the pressure plate 65 moves back against energizing force of the cone disk spring, and the initial torque is cancelled.

Abstract: The invention concerns a clutch mechanism comprising a support part (8) bearing at its outer periphery fixing brackets (7) in contact with the inner surface of the stop brackets (5) of a cover (2), bearing pivotedly the clutch levers (42), some of which are in contact with the support part (8) inner periphery. The invention is applicable to motor vehicles.

Abstract: A power train for use in motor vehicles has a friction clutch including a housing which rotates with the output shaft of the engine and a clutch disc which transmits torque to the input shaft of a change-speed transmission in the engaged condition of the clutch. The clutch can be engaged and/or disengaged by one or more slave cylinders which is or are rotatably mounted on and is or are being held against axial movement relative to the clutch housing. At least one release bearing can be installed between the piston(s) of the slave cylinder(s) and the diaphragm spring of the friction clutch, and a second bearing is or can be installed between the slave cylinder housing(s) and the clutch housing.

Abstract: A friction clutch wherein a pressure plate is movable axially of and rotates with a housing which is driven by the engine of a motor vehicle. The pressure plate cooperates with a coaxial engine-driven counter-pressure plate to bear upon the respective friction linings of a clutch disc when the clutch is engaged to drive the input shaft of a transmission in the power train of the vehicle. A diaphragm spring is tiltable relative to an annular seat at the inner side of the housing and urges the pressure plate against the adjacent friction linings when the clutch is engaged. An automatic wear compensating unit serves to move the diaphragm spring and the seat axially relative to and away from the inner side of the housing to thus compensate for wear upon the friction linings. The diaphragm spring has resilient prongs which bear, directly or indirectly, upon portions of the housing to urge the diaphragm spring against the seat and to thus bias the seat toward the inner side of the housing.

Abstract: The friction clutch comprises a clutch disk arrangement which can be brought into frictional engagement with associated friction surfaces by the action of a movably mounted thrust plate arrangement. The actuation device includes a pressure medium force cylinder arrangement by means of which the friction clutch can be actuated by an actuating member; a measuring arrangement detects an actual actuation. A control/regulating valve arrangement is connected with a pressure medium source, with a pressure compensation opening or a pressure compensation reservoir and with the pressure medium force cylinder arrangement, by means of which control/regulating valve arrangement the pressure medium force cylinder arrangement can be actuated depending on the actual actuation and on a reference actuation which can be predetermined. According to one aspect of the invention the measuring arrangement detects an adjusting path of at least one thrust plate of the thrust plate arrangement as actual actuation.

Abstract: A double clutch assembly comprising a first clutch area for the optional production of a torque-transmitting connection between a drive element and a first driven element, a second clutch area for the optional production of a torque-transmitting connection between the drive element and a second driven element, and a common engaging/disengaging mechanism, by means of which the first clutch area and the second clutch area can be actuated to produce or to nullify the torque-transmitting condition.

Abstract: A multi-disk clutch having a housing with a toothed ring and a cover connected to the toothed ring. The toothed ring, on an inner circumferential surface, has a plurality of disk carrier teeth distributed in the circumferential direction. At least one outer disk engages, of an external toothing, with the disk carrier teeth on the toothed ring. At least one inner disk is connected in rotation-proof fashion to a coupling hub. The clutch further has a pressure plate, and an energy storage device. The energy store device, in an outer circumferential area, has a recess associated with at least one disk carrier tooth that opens substantially radially outward and the disk carrier tooth engages in the recess.

Abstract: A twin clutch has two clutch discs, each arranged on one of two coaxial shafts, having a clutch cage, which surrounds the clutch discs in the manner of an annulus, and having pressure plates which are held in a rotationally fixed manner therein and are arranged axially in such a way that they can be displaced separately axially between the clutch discs and can be pressed against the clutch discs by a diaphragm-spring arrangement arranged axially between them and can be disengaged from the respective clutch disc by means of separate release members. The diaphragm-spring arrangement includes at least two diaphragm springs of essentially the same type arranged in series, giving a broad actuating range with a constant spring force. When the release members are unactuated, the diaphragm-spring arrangement operates in this actuating range irrespective of clutch wear, it being possible to transmit approximately half of a maximum torque to be transmitted at each clutch.

Abstract: A friction clutch wherein a damper which operates with friction between the housing and the clutch spring serves to minimize or to prevent axial stray movements of the diaphragm spring relative to the housing. This eliminates chatter and/or other forms of noise which unrestricted axial oscillatory movements of the diaphragm can cause in a conventional friction clutch or in a power train employing a conventional friction clutch.

Abstract: A clutch control apparatus includes a clutch disk, which is engaged with a flywheel, by means of a diaphragm spring; a release mechanism (including a rod and an electric motor) for pressing a central portion of the diaphragm spring; and a clutch control circuit. The flywheel and an outer circumferential portion of the diaphragm spring abut each other via taper portions of a pressure plate and an adjust wedge member. The clutch control circuit calculates an ideal clutch load and an output torque of the electric motor for a detected stroke of the rod. On the basis of these values, the clutch control circuit obtains the acceleration of the rod. The clutch control circuit estimates a stroke of the rod from the obtained acceleration and causes the adjust wedge member to rotate such that a detected actual stroke and the estimated stroke become equal, thereby modifying the attitude of the diaphragm spring accordingly.

Abstract: The invention concerns a clutch mechanism for friction clutch, in particular for motor vehicles, comprising a cover (8) with a transversely oriented base (80) and means (81) for fixing the clutch mechanism on a rotating flywheel (1), a pressure plate (3), elastic tabs linking in rotation, with axial mobility, the pressure plate (3) in rotation with the cover (8), axially operating elastic clutching means (7) axially stressing the pressure plate (8) in the opposite direction from the cover (8) base (80) and a disengaging device countering at will the action of said elastic clutching means (7): said elastic clutching means (7) are associated with two elastic washers (4, 6) mounted between the pressure plate (3) and the cover (8), and adapted to act on the pressure plate (3) parallel relative to the elastic clutching means (7) in a direction disengaging the clutch.

Abstract: A friction coupling for use in particular in the drive train of a motor vehicle includes a clutch casing, a pressure plate which is guided in a rotationally fixed manner with respect to the clutch casing, at least one clutch disk and a spring device containing about 40-60% nickel. A method for coating a nickel-base material, in particular the above mentioned spring element for friction clutches, wherein at least part of the surface of the spring device contains boride, and also a method for producing such a spring device which includes a heat treatment are also disclosed.

Abstract: A clutch for a motor vehicle has a sensor device (7) for detecting the limit of wear of friction linings (6), with an electric switch (11) having an electric conductor (13). The electric conductor (13) is severed by a rotatably mounted switching part (14) when the limit of wear is reached. Before the limit of wear has been reached, the switching part (14) is biased by a blocking part (15) into a position remote from the electric conductor (13). It is possible thereby to determine the limit of wear with particular exactitude.

Abstract: The friction clutch comprises a cover (8) with a base (80), a pressure plate (3) with a front friction face (30) for co-operating with a clutch friction and, set between the pressure plate (3) and the base (80) of the cover (8), a diaphragm (2) with a peripheral part extended inward by fingers (23) to oppose at will, by means of a nose (11) of a clutch bearing (10), the action of said peripheral part (21), a booster elastic washer (7) acting on the fingers (23) of the diaphragm (2) in the declutching direction resting on the cover (8): the booster washer (7) is arranged between the cover (8) and the leading-edge piece or nose (11) such that it is adapted to operate on the fingers (23) of the diaphragm (2) via said leading-edge piece or nose (11).

Abstract: A multi-plate clutch 1 of a boss driving type is provided with structure to make it easy to replace a boss, and to limit the number of parts. The clutch 1 basically includes a flywheel 2, a boss 9, a clutch cover assembly 3, and input-output friction members such as clutch disks 42 and 43, an intermediate plate 44, and a pressure plate 17. The boss 9 is detachably coupled to the flywheel 2. The boss 9 includes an annular portion 10 and a plurality of columnar portions 11, which are formed integrally with the annular portion 10. The columnar portions 11 extend in an axial direction from the annular portion 10. Each of the columnar portions 11 is disposed circumferentially next to one another in a circular pattern with a radial pass-through space formed therebetween The clutch cover assembly 3 includes a clutch cover 16 which is detachably coupled to the boss 9, a pressure plate 17, and a diaphragm spring assembly 18.