Hydraulic clearance compensation element

Details Hydraulic clearance compensation element Hydraulic clearance compensation element

1997-07-15

1998-08-04

Lo, Weilun

Internal-combustion engines

Poppet valve operating mechanism

Tappet

123 9057, 74569, F01L 124

Patent

active

057878501

ABSTRACT:
The clearance compensation element (1) of the invention which can be installed, for example, in a valve drive of an internal combustion engine has a certain idle stroke function for undesired overpressure states of its high pressure chamber (12) during a base circle phase of the actuating cam. According to the invention, a valve means (14) such as a ball which closes the high pressure chamber (12) in the direction of a reservoir (10) is freely movable within certain limits. The ball (14), while being extremely light, closes the valve seat bore (13) with the shortest possible stroke immediately upon commencement of the opening ramp (A.sub.N) of the cam.

REFERENCES:
patent: 4184464 (1980-01-01), Svihlik
patent: 4638772 (1987-01-01), Burandt
patent: 4721076 (1988-01-01), Goppelt et al.
patent: 4807576 (1989-02-01), Sonoda et al.
patent: 4951619 (1990-08-01), Schaeffler
patent: 5408959 (1995-04-01), Speil
patent: 5622147 (1997-04-01), Edelmayer
Sonoda, "Hydraulic Tappet for Internal Combustion Engine", Patent Abstracts of Japan, M-628, Apr. 1987, vol. 11/No. 301 Abstract No. 54 (Translation).

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