Device for varying the opening and closing times of gas exchange

Details Device for varying the opening and closing times of gas exchange Device for varying the opening and closing times of gas exchange

1998-03-30

1998-11-17

Lo, Weilun

Internal-combustion engines

Poppet valve operating mechanism

With means for varying timing

123 9031, 123 9037, 74568R, 464 2, F01L 1344

Patent

active

058362797

ABSTRACT:
A device for varying the opening and closing times of gas exchange valves of an internal combustion engine, comprising a driven unit (2) rotationally fixed to an intake or exhaust camshaft, a drive unit (8) which is in driving relationship with a crankshaft through a traction element, and an adjusting piston (19) axially displaceable within a housing (10) and axially delimits two pressure chambers (22, 23) while being connected to a sliding sleeve (24) which is provided with two oppositely oriented helical gear sections (26, 28) which cooperate with complementary helical gearings (5, 16) on the driven unit (2) and the drive unit (8), said pressure chambers (22, 23) being sealed from each other by a piston sealing ring (21) and a sealing disc (31) arranged between the end faces (6, 17) of the driven unit (2) and the drive unit (8), a second sealing disc (36) being arranged next to the first sealing disc (31), the inner peripheral clearance of the second sealing disc (36) to the hub (3) is smaller than the mounting clearance of the drive unit (8) to the driven unit (2), and pressure medium leakages between the pressure chambers (22, 23) of the device (1) are sealed by the second sealing disc (36).

REFERENCES:
patent: 5090365 (1992-02-01), Hotta et al.
patent: 5201289 (1993-04-01), Imai
patent: 5309873 (1994-05-01), Suga et al.
patent: 5377639 (1995-01-01), Nakadouzono et al.
patent: 5588404 (1996-12-01), Lichti et al.
patent: 5727508 (1998-03-01), Goppelt

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