Device for varying valve timing of gas exchange valves of intern

Details Device for varying valve timing of gas exchange valves of intern Device for varying valve timing of gas exchange valves of intern

1998-06-09

1999-01-19

Lo, Weilun

Internal-combustion engines

Poppet valve operating mechanism

With means for varying timing

123 9031, 123 9037, F01L 1344

Patent

active

058603972

ABSTRACT:
A device (1) for varying the valve timing of the gas exchange valves of an internal combustion engine, essentially comprising a driven unit (2) rotationally fixed to an intake or exhaust camshaft, a drive unit (4) in driving relationship with a crankshaft through a traction element and formed by a drive pinion (5), a housing (6) and a pinion hub (10) made up of an inner ring (11) and an outer ring (13), the device (1) further comprising an adjusting piston (15) which is axially displaceable on the inner wall (7) of the housing (6) and axially delimits two pressure chambers (8, 9) while being connected to a hollow cylindrical sliding sleeve (18) to reduce pressure medium leakages between the pressure chambers (8, 9) and the noise produced by the adjusting piston (15) and the sliding sleeve (18) during their adjusting movements to a minimum by arranging between the outer surface (16) of the adjusting piston (15) and the inner wall (7) of the housing (6), and/or between the inner ring (11) of the pinion hub (10) and the sliding sleeve (18), an annular strip (21, 22) of a thermoplastic or of an elastomeric material which is configured both as a guide strip and a sealing ring for the adjusting piston (15), or for the sliding sleeve (18), as the case may be.

REFERENCES:
patent: 5301639 (1994-04-01), Satou
patent: 5309873 (1994-05-01), Suga et al.
patent: 5509384 (1996-04-01), Schmid
patent: 5666914 (1997-09-01), Ushida et al.
patent: 5727508 (1998-03-01), Goppelt

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