Abstract: A clutch unit in which a facing (9) of a clutch disc (5) is disposed between a flywheel (1) and a pressure plate (6) so as to engage and disengage the clutch unit by moving the pressure plate (6) in its axial direction; a projection (6a) extending to an axis side is formed integrally on the pressure plate (6), a release bearing (20) is made directly engage with the projection (6a), and a release sleeve (24) supporting the release bearing (20) is made movable in the axial direction by a hydraulic cylinder (23).

Abstract: The present invention discloses a damper disc comprising a spline hub; a radial flange formed at the hub; a case connected to facings; circumferentially spaced plural compressible coil springs connecting the case and the flange together; sealed spring chambers formed around the springs by the case or a cover; sealed narrow spaces connecting the spring chambers together; and spring seats disposed at both ends of the springs; said chambers and spaces being filled with oil, so that the oil applies a resistance force to the moving spring seats. At least one of side surfaces of a portion of the flange radially inside the springs may be provided with radially spaced annular protrusions, and the cases may be provided with annular protrusions engaging with the protrusions on the flange with narrow spaces therebetween.

Abstract: The present invention discloses a damper disc comprising a spline hub; a radial flange formed at the hub; a case connected to facings; circumferentially spaced plural compressible coil springs connecting the case and the flange together; sealed spring chambers formed around the springs by the case or a cover; sealed narrow spaces connecting the spring chambers together; and spring seats disposed at both ends of the springs; said chambers and spaces being filled with oil, so that the oil applies a resistance force to the moving spring seats. At least one side surfaces of a portion of the flange radially inside the springs may be provided with radially spaced annular protrusions, and the cases may be provided with annular protrusions engaging with the protrusions on the flange with narrow spaces therebetween.

Abstract: A damper disc of a long travel type has a hub adapted to be connected to an output shaft; circumferentially spaced flanges projecting radially outwardly from the outer periphery of the hub; a pair of side plates connected to a torque input portion, disposed at both sides of the flanges and rotatably fitted around the hub; spacers circumferentially spaced to the flanges; sub-plates rigidly holding the spacers and rotatably fitted around portions of the hub between the side plates and the flanges; a first friction member having a small friction force and disposed between the flange and the sub-plate; a second friction member having a large friction force and disposed between the sub-plate and the side plate; a first spring always circumferentially connecting the flange and the side plates; a second spring adapted to circumferentially connect the flange and the spacers in a second torsion operation in which a relative torsion angle between the flange and the side plates is larger than a predetermined value; and

Abstract: The invention discloses a damper disc comprising a spline hub; a radial flange formed at the hub; a sealed case covering the flange and having a radially outer portion to which a torque is transmitted; torsion springs disposed in openings in the flange and axially faced hollows in the case for connecting the flange and the case together; and a piston cylinder mechanism arranged in the case and having a piston operable to move in accordance with relative torsion between the case and the flange, the case and a cylinder of the piston cylinder mechanism being filled with operating oil, and the cylinder being provided with a narrow space through which the oil can be discharged.

Abstract: This invention relates to a diaphragm spring serving as a clutch spring for applying engaging force to the clutch, in which a shot-peened layer is provided only on a concave rear surface of said diaphragm spring, especially only on a surface of the pressure plate side of a peripheral annulus which is subjected to tensile stress in engaging the clutch. According to this invention, an early decrease (yielding) in spring force of said diaphragm spring can be avoided.