Device for varying the valve timing of gas exchange valves of an

Details Device for varying the valve timing of gas exchange valves of an Device for varying the valve timing of gas exchange valves of an

1998-03-31

1999-02-02

Lo, Weilun

Internal-combustion engines

Poppet valve operating mechanism

With means for varying timing

123 9031, 123 9037, 277942, F01L 1344

Patent

active

058651500

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 (36) in the connecting structure (35), or the sealing rings (20, 21, 22) comprise a wear-reducing coating (34b) at least on an outer peripheral surface (23, 24, 25) and are in a sealed sliding relationship through this coated outer peripheral surface (23, 24, 25) with the reception bore (36) in the connecting structure (35).

REFERENCES:
patent: 3020056 (1962-02-01), Agens
patent: 4744572 (1988-05-01), Sahba et al.
patent: 5540197 (1996-07-01), Golovatai-Schmidt et al.
patent: 5566651 (1996-10-01), Strauss et al.
patent: 5630593 (1997-05-01), Swensen et al.
patent: 5727508 (1998-03-01), Goppelt
patent: 5765517 (1998-06-01), Wiehl

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