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

F - Mech Eng,Light,Heat,Weapons

04

B

103/39

F04B 1/20 (2006.01)

Patent

CA 1110109

ABSTRACT OF THE DISCLOSURE 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 there- between while permitting movement of the valve plate relative to the housing. The transfer tubes each have an outwardly-opening groove ad- jacent 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.

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