Abstract: A clutch drum for a multi-plate clutch in an automatic transmission is provided at an inner periphery thereof with splines by which friction plates are engaged. Each of the splines has a tooth tip having two circumferential ends. Only one of the circumferential ends of the tooth tip has a curved surface. The splines of the clutch drum may be formed by form rolling using a tooth forming tool including a tooth root. The tooth root may have a circumferentially leading end and a circumferentially trailing end in a rotational direction, with only the circumferentially leading end having a curved surface.

Abstract: A wet-type multiplate clutch has an outer circumferential drum section, an inner circumferential hub, a pressing member, and a clutch engagement unit composed of plural friction plates and separator plates alternately arranged between the drum section and the hub.

Abstract: The present invention provides a clutch drum which is provided at its inner periphery with splines by which friction plates are engaged and wherein each of the splines has a tooth tip having a curved surface at one circumferential edge thereof.

Abstract: A wet-type multiplate clutch has an outer circumferential drum section, an inner circumferential hub, a pressing member, and a clutch engagement unit composed of plural friction plates and separator plates alternately arranged between the drum section and the hub.

Abstract: In the starting clutch, an electrical pump or an engine pump is omitted and a substitutive pump mechanism is obtained with a simple construction thereby to circulate lubricating oil within the starting clutch. There is provided a starting clutch in which lubricating oil supplied form a drive shaft side is circulated within the clutch and input side elements and output side elements are tightened by an axial load to transmit a power and wherein a non-electrically operated pump mechanism is provided within the starting clutch.

Abstract: In a wet multi-plate clutch in which an inner periphery of a clutch case is provided with a spline, and one of a friction engaging elements is fitted to the spline, the spline is provided with a recess whose sectional area is gradually increased toward an opened end of a clutch case.

Abstract: A starting clutch includes a planetary mechanism; a first clutch for outputting a torque to an outer diameter portion of the planetary mechanism; a second clutch for outputting the torque to an intermediate portion of the planetary mechanism; and a lock mechanism for locking a reactive force from an inner diameter portion of the planetary mechanism.

Abstract: The present invention provides a wet multi-plate clutch comprising a clutch case and hub disposed on a same axis, a first friction engagement element disposed in the clutch case, a second friction engagement element disposed on the hub, and a piston for applying an axial load to the first and second friction engagement elements, and wherein a recessed groove is formed in a surface of the piston opposing to the first and second friction engagement elements, and a wave spring is disposed within the recessed groove, and only a portion of the opposed surface at an outer diameter side or an inner diameter side of the recessed groove urges the respective friction engagement elements.

Abstract: The present invention provides a multi-plate clutch in which friction engagement elements are disposed within a clutch case so that a power is transmitted by an applying tightening load to the friction engagement elements, wherein a tone wheel is provided on an outer periphery of the clutch case. Further, the present invention provides a rotational speed detection sensor attaching structure for attaching a rotational speed detection sensor for detecting a rotational speed of a multi-plate clutch having a clutch case provided at its outer periphery with a substantially cylindrical portion, wherein the cylindrical portion is provided with an oil port opened to the outer periphery and adapted to discharge lubricating oil and the rotational speed detection sensor is attached to a position opposed to the oil port so that the rotational speed is detected by detecting a position of the oil port.

Abstract: The present invention provides a starting clutch in which an input side element and an output side element are joined together by applying an axial load thereby to transmit a power, which clutch comprises an urging device for always providing the axial load, and a releasing device for releasing the input side element and the output side element from the axial load.

Abstract: A multiplate clutch has a stopper ring arranged at an opening of a clutch case to limit axial movements of frictionally engaging elements such as separator plates, friction plates and a backing plate. Among these frictionally engaging elements, the backing plate which is operably brought into engagement with the stopper ring is provided on a stopper-ring-engaging wall thereof with a stopper portion to support the stopper ring at an inner periphery thereof.

Abstract: In the starting clutch, an electrical pump or an engine pump is omitted and a substitutive pump mechanism is obtained with a simple construction thereby to circulate lubricating oil within the starting clutch. There is provided a starting clutch in which lubricating oil supplied form a drive shaft side is circulated within the clutch and input side elements and output side elements are tightened by an axial load to transmit a power and wherein a non-electrically operated pump mechanism is provided within the starting clutch.

Abstract: A double wound band which comprises an annular intermediate band, a pair of annular outer bands each with a free end secured to face the free end of the intermediate band, all three bands with a firctional surface formed on the inner peripheral surface, an anchor portion, an applied portion for receiving the force from an actuator to contract the bands to brake a rotary member. The braking device further comprises a deformation amount balancing device for balancing an amount of elastic deformation of the intermediate band and an amount of elastic deformation of the outer bands at a predetermined position, and a center misalignment correction device for correcting a center misalignment between the intermediate band and the outer bands.

Abstract: The present invention provides a wet multi-plate clutch comprising a clutch case and hub disposed on a same axis, a first friction engagement element disposed in the clutch case, a second friction engagement element disposed on the hub, and a piston for applying an axial load to the first and second friction engagement elements, and wherein a recessed groove is formed in a surface of the piston opposing to the first and second friction engagement elements, and a wave spring is disposed within the recessed groove, and only a portion of the opposed surface at an outer diameter side or an inner diameter side of the recessed groove urges the respective friction engagement elements.

Abstract: A starting clutch includes a planetary mechanism; a first clutch for outputting a torque to an outer diameter portion of the planetary mechanism; a second clutch for outputting the torque to an intermediate portion of the planetary mechanism; and a lock mechanism for locking a reactive force from an inner diameter portion of the planetary mechanism.

Abstract: A brake band comprises a strap and a lining bonded on an inner peripheral surface of the strap. The lining is provided in a surface thereof with at least one oil groove formed under compression to a predetermined depth.

Abstract: The present invention provides a starting clutch in which an input side element and an output side element are joined together by applying an axial load thereby to transmit a power, which clutch comprises urging means for always providing the axial load, and releasing means for releasing the input side element and the output side element from the axial load.

Abstract: A brake band suitable for use in a vehicle transmission is described. The brake band is composed of a band portion, such as a metal strap, and a brake lining bonded at an outer peripheral surface thereof on an inner peripheral surface of the band portion and has an apply side end and an anchor side end located opposite to each other relative to a circumferential length of the brake band. The brake lining is provided with oil-dependent, friction surface cooling grooves having bottom walls, respectively. Each cooling groove is provided with a discharging aperture extending through the bottom wall of the corresponding cooling groove to the outer peripheral surface of the brake lining. Adjacent to the anchor side end of the brake band, the brake lining is also provided with an oil film formation promoter, for example, in the form of one or more recesses not extending to the outer peripheral surface of the brake lining.

Abstract: A brake band suitable for use in an automatic transmission is described. The brake band has a brake lining with a surface subjected beforehand to working on an apply side thereof and having a percent contact area in a range of 10-40%, preferably 25-40% on the apply side thereof at the time of commencement of use.