Device for varying the valve timing of gas exchange valves of an internal combustion engine
US5865150A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 31, 1998 |
| Grant date | Feb 2, 1999 |
| Priority date | — |
| Expiry date | Mar 31, 2018 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S277/942
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A device for varying the valve timing of gas exchange valves of an internal combustion engine comprising a driven unit (3) rotationally fixed to a camshaft (2), and a drive unit (6) which is in driving relationship through a traction element with a crankshaft while being rotatably mounted on the driven unit (3), the device (1) further comprising at least two pressure chambers (11, 12) that can be pressurized by a hydraulic pressure medium, the hydraulic pressure medium being fed into the device (1) through a connecting bracket (13) which is rotationally fixed to the driven unit (3) and coaxially surrounds the end portion of the camshaft (2) while comprising on its outer peripheral surface (16), a plurality of annular flanges (29, 30, 31) having sealing rings (20, 21, 22) arranged in annular grooves (17, 18, 19), which annular flanges (29, 30, 31) are sealingly surrounded by a reception bore (36) in a connecting structure (35), characterized in that the sealing rings (20, 21, 22) either comprise an elastic coating (34a) at least on an outer peripheral surface (23, 24, 25) and are sealingly force-locked through this coated outer peripheral surface (23, 24, 25) with the reception bore…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.