Hydraulic unit and transfer tube and seal structure therefor

Details Hydraulic unit and transfer tube and seal structure therefor Hydraulic unit and transfer tube and seal structure therefor

1977-03-17

1978-10-24

Freeh, William L.

Motors: expansible chamber type

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

Motive fluid bypass to or from assembly

F01B 1304

Patent

active

041215028

ABSTRACT:
A transfer tube and seal structure for a hydraulic unit for connecting a pair of flow passages in a housing to flow passages in a valve plate which is floatingly mounted and engageable against a cylinder block in an axial piston hydraulic unit with ports in the valve plate communicating with axially-extending bores in the cylinder block, each of which carries a piston movably mounted therein. A transfer tube is loosely positioned in coaxial flow passages to span the gap between the valve plate and the housing and maintain a sealed flow relation therebetween while permitting movement of the valve plate relative to the housing. The transfer tubes each have an outwardly-opening groove adjacent each end thereof mounting a metallic seal ring and with the outer face of the seal ring being of substantially reduced width for a limited area of sealing contact with the walls of the flow passages.

REFERENCES:
patent: 1691518 (1928-11-01), Hall
patent: 2325469 (1943-08-01), Boissou
patent: 2809853 (1957-10-01), Nathan
patent: 3075778 (1963-01-01), Bowers et al.
patent: 3136263 (1964-06-01), Timms
patent: 3150889 (1964-09-01), Watts
patent: 3887198 (1975-06-01), McClure

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