Hydraulic unit and transfer tube and seal structure therefor
US4121502A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Mar 17, 1977 |
| Grant date | Oct 24, 1978 |
| Priority date | — |
| Expiry date | Mar 17, 1997 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF04B1/2071
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.