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

1998-04-14

2000-07-18

Lo, Weilun

Internal-combustion engines

Poppet valve operating mechanism

With means for varying timing

123 9031, 74568R, 464 2, 464161, F01L 1344

Patent

active

06089198&

ABSTRACT:
A device for varying the opening and closing times of gas exchange valves of an internal combustion engine, comprising a drive unit (2) which is in driving relationship with a crankshaft through a traction element and a driven unit (14) connected to an intake or exhaust camshaft, there being arranged within the device (1), a coupling element (18) by which a rotationally fixed, force-transmitting connection can be established between the drive unit (2) and the driven unit (14) when the pressure of the hydraulic medium falls below a level required for the displacement of the adjusting piston (9), the coupling element (18) being configured as a locking piston (19) which can be displaced on the one hand by hydraulic pressure and on the other hand by an auxiliary energy and comprises on an end face (26) a number of concentrically arranged extensions (27) which are associated to complementary recesses (35) of a locking ring (34) in the housing (6) to avoid noise generation on starting of the internal combustion engine caused by an inadequate hydraulic clamping-in of the adjusting piston (9).

REFERENCES:
patent: 5377639 (1995-01-01), Nakadouzono et al.
patent: 5738056 (1998-04-01), Mikame et al.
patent: 5775279 (1998-07-01), Ogawa et al.

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