Abstract: An hydraulic clutch comprises coaxial input and output shafts with driving and driven discs respectively mounted on the shafts. The mounting of the driven discs on the output shaft includes a one piece member having a cup with an annular wall that surrounds the input shaft and the driving discs. The one piece member also includes the output shaft. An hydraulic piston is used to engage the clutch discs; and pins, around which return springs are mounted, limit the throw of the piston. The arrangement tends to minimize turbulence, heat build-up, and power losses when the clutch is in the disengaged condition.

Abstract: An hydraulic clutch is provided, which is positively engaged by hydraulic means, and is disengaged by mechanical means. The clutch includes a male cone member carried for rotation on an input shaft, and for limited axial sliding movement therealong. Interconnection between the male cone member and the input shaft is provided by a series of elongated pins carried in recesses formed in the male cone member and in the input shaft. A female cone member, formed integrally with an output shaft, receives the male cone member for driving engagement. When engagement is desired, a fluid pressure piston and thrust plate urge the male cone member axially along the input shaft into driving engagement with the female cone member. A stop pin carried by the thrust plate engages an abutment for limiting the axial motion of the hydraulic piston and male cone member.

Abstract: A lamellae clutch with a large number of lamellae and with a pressure disk adapted to compress the lamellae during engagement of the clutch; the play between the individual lamellae is thereby determined by the length of slide bolts arranged in bores of the pressure disk whereby the slide bolts exceed by a predetermined amount the thickness of the pressure disk.