Hollow piston for hydrostatic machines

Details Hollow piston for hydrostatic machines Hollow piston for hydrostatic machines

1977-11-23

1980-03-04

Cohen, Irwin C.

Expansible chamber devices

With fluid purifying means

91488, 92158, 92172, 92181R, F15B 2104, F16K 100, F16K 108

Patent

active

041910958

ABSTRACT:
A hollow piston for a hydrostatic piston machine and especially for a swash-plate-type axial-piston pump or motor, comprises a hollow outer cylinder member which is formed at one end with a ball head and at the other end with a cover. Extending centrally through this hollow piston is a central post having its opposite ends secured to or engaging the opposite ends of the outer piston member and formed with a central bore communicating between a passage in the cover and a passage in the ball head. At least one of these ends of the central post is juxtaposed with a respective end of the piston and the juxtaposed ends are formed with a conical surface and an edge engaging this surface to seal the post to the outer member.

REFERENCES:
patent: 3106138 (1963-10-01), Thoma
patent: 3828654 (1974-08-01), Wiethoff
patent: 3861278 (1975-01-01), Forster
patent: 3896707 (1975-07-01), Holmstrom

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