Method and apparatus for reducing operating noise in axial pisto

Details Method and apparatus for reducing operating noise in axial pisto Method and apparatus for reducing operating noise in axial pisto

1983-01-13

1984-12-25

Freeh, William L.

Motors: expansible chamber type

Three or more cylinders arranged in parallel radial or...

Cylinders parallel to rotation axis

417 53, 91 65, F04B 120, F01B 1306

Patent

active

044896425

ABSTRACT:
A method and an apparatus are disclosed for reducing operating noise in axial piston pumps and motors. An elongated passage (88, 98) connects the outlet plenum (86) of the apparatus directly with each cylinder (30) during its discharge stroke, the passage being positioned between the point (68) at which the discharge stroke begins and the leading edge (78) of the discharge port (74) of the apparatus and the length and cross-section of the passage being sufficient to permit gradual attenuation of any pressure differential between each cylinder and the outlet plenum before the cylinder opens to the discharge port leading to the outlet plenum. See FIGS. 1 and 2.

REFERENCES:
patent: 3094078 (1963-06-01), Brueder
patent: 3858483 (1975-01-01), Hein
patent: 4007663 (1977-02-01), Nagatomo
patent: 4096786 (1978-06-01), Schauer

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