Abstract: A lockup device 6 of a torque converter 1 includes a damper mechanism 31. The damper mechanism 31 includes a drive plate 36, a driven plate 35, coil springs 37 and a ring 38. The coil springs 37 transmit a torque between the drive plates 36 and driven plate 35. The coil springs 37 are aligned in the rotational direction of the torque converter 1, and extend in the rotating direction. The ring 38 allows movement of the coil springs 37 in rotational directions, while preventing movements in other directions. The ring 38 is supported by one of the drive and driven plates 36 and 35, and extends through the coil springs 37. The ring 38 allows an increase in coil diameters of the coil springs 37 that are used in the lockup device 6 of the torque converter 1.

Abstract: A lockup damper included in a lockup mechanism 8 of a torque converter 1 includes a piston member 9, a driven member 10, coil springs 13 and seat members 40. The coil spring 13 is arranged between the piston member 9 and the driven member 10. The seat member 40 is attached to the driven member 10, has a loose-fit portion 40c loosely fitted to the end of the coil spring 13, and restricts the radially outward movement of the end of the coil spring 13 by the loose-fit portion 40c fitted into the coil spring 13.

Abstract: A clutch disk assembly 1 includes an output rotary member 3, an input rotary member 2, a first spring 7, a second spring 8 and a friction generating mechanism 13. The first spring 7 circumferentially and elastically couples the output and input rotary members 3 and 2 together, and is compressed in a first stage in which a torsion angle between them does not exceed a first torsion angle 1. The second spring 8 is compressed in a second stage in which the torsion angle between the output and input rotary members 3 and 2 exceeds the first torsion angle 1, and provides a rigidity in the second stage higher than a rigidity in the first stage. The friction generating mechanism 13 circumferentially and frictionally engages the input and output rotary members 2 and 3 with each other, and can generate slide in the first and second stages.

Abstract: A clutch disk is provided with a cushioning plate 16 to prevent an eccentric abrasion of its friction facings. The clutch disk does not use rivets and has a cushioning function. The clutch disk includes a pair of friction facings 15a and 15b and a cushioning plate 16. The cushioning plate 16 includes in a fixing part 16a, a plurality of first installation parts 16b, a plurality of second installation parts 16c, a plurality of first connecting parts 16d, and a plurality of second connecting parts 16e. The first installation parts 16b have first friction facings 15a installed thereon. The first installation parts 16b with their first friction facings 15a extend from the fixing part 16a to an outer circumferential side of the cushioning plate 16. The second installation parts 16c have second friction facings 15b installed thereon.

Abstract: A lockup damper included in a lockup mechanism 8 of a torque converter 1 includes a piston member 9, a driven member 10, coil springs 13 and seat members 40. The coil spring 13 is arranged between the piston member 9 and the driven member 10. The seat member 40 is attached to the driven member 10, has a loose-fit portion 40c loosely fitted to the end of the coil spring 13, and restricts the radially outward movement of the end of the coil spring 13 by the loose-fit portion 40c fitted into the coil spring 13.

Abstract: A damper mechanism for attenuating vibrations having a vibration attenuating spring element (1) which includes: a leaf spring (2) having a bent portion (4) and a pair of lever portions (5) extending from both ends of the bent portion (4); and an elastic member (3) disposed between the lever portions (5). When the leaf spring (2) is subjected to compressive forces, the lever portions (5) and the elastic member (3) are elastically deformed. Internal friction is generated in the elastic member (5). The functions typically provided by a conventional elastic member and a conventional resistance generating mechanism are realized by utilizing a simple spring element composed of the leaf spring (2) and the elastic member (3).

Abstract: A lockup damper included in a lockup mechanism 8 of a torque converter 1 includes a piston member 9, a driven member 10, coil springs 13 and seat members 40. The coil spring 13 is arranged between the piston member 9 and the driven member 10. The seat member 40 is attached to the driven member 10, has a loose`-fit portion 40c loosely fitted to the end of the coil spring 13, and restricts the radially outward movement of the end of the coil spring 13 by the loose-fit portion 40c fitted into the coil spring 13.

Abstract: A lockup damper of a torque converter 1 includes a retaining plate 14, a driven member 10, first coil springs 13A, second coil springs 13B and an intermediate plate 30. The first coil springs 13A are disposed between the retaining plate 14 and the driven plate 10. The second coil springs 13B are disposed between the retaining plate 14 and the first coil springs 13A. The intermediate plate 30 has spring support portions 32 disposed between the first and second coil springs 13A and 13B for circumferentially supporting the first and second coil springs 13A and 13B, and engagement portions 33a, 33b, 34a and 34b engageable with the retaining plate 14 or the driven member 10.

Abstract: A gear teeth forming apparatus is used for forming a plurality of gear teeth on an outer circumferential wall of a pressed drum. The apparatus includes a die and a plurality of rotational rollers. A plurality of convex/concave portions are formed in the axial direction on the die. The die has an outer circumferential surface on which the outer circumferential wall of the pressed drum is fitted. Also, the die is movable in the axial direction. A plurality of the rotational rollers are insertable partially into grooves of the die and are rotatable along the grooves.

Abstract: A gear teeth forming apparatus is used for forming a plurality of gear teeth on an outer circumferential wall of a pressed drum. The apparatus includes a punch and a plurality of rotational rollers. A plurality of convex/concave portions are formed in the axial direction on the punch. The punch has an outer circumferential surface on which the outer circumferential wall of the pressed drum is fitted. Also, the punch is movable in the axial direction. A plurality of the rotational rollers are insertable partially into grooves of the punch and are rotatable along the grooves.