Rotary connection for passage of hydraulic oil
US4252147A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 21, 1978 |
| Grant date | Feb 24, 1981 |
| Priority date | — |
| Expiry date | Jul 21, 1998 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T137/86268
- WIPO fieldHandling
- WIPO sectorMechanical engineering
Abstract
Rotary connection having a housing which is provided with annular ducts and with feed bores for pressurized oil and non-pressurized oil and having a piston-shaped inner part arranged in the housing, the inner part being formed with bores and with grooves on its periphery, for the passage of high-pressure oil and practically non-pressurized hydraulic oil. By means of a valve piston which can be acted-on at both end surfaces thereof with pressurized oil, lubricating ducts are connected, depending upon the switched position of the valve piston, via a central longitudinal bore provided with transverse bores, with the respective annular duct which at the time is not applied with pressurized oil.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.