Hydraulic tappet clearance compensation device

Details Hydraulic tappet clearance compensation device Hydraulic tappet clearance compensation device

2006-12-12

2006-12-12

Chang, Ching (Department: 3748)

Internal-combustion engines

Poppet valve operating mechanism

Tappet

C123S090450, C123S090550, C123S090480

Reexamination Certificate

active

07146955

ABSTRACT:
The invention relates to a hydraulic tappet clearance compensation device (1) for a valve gear of an internal combustion engine, the high pressure chamber (8) of which device can be rapidly and easily vented. For this purpose an annular collar (11) has radial openings (16) distributed over the circumference of its pressure piston (5). These allow air bubbles, which accumulate between an outer shell of the annular collar (11) and a bore (3) of a housing (2), to escape to a bore (9) for a non-return valve (10) and hence directly into the open. There is therefore no need for venting via a leakage gap (13) between the pressure piston (5) and the housing (2), which has hitherto yielded only unsatisfactory results.

REFERENCES:
patent: 6606972 (2003-08-01), Wenisch et al.
patent: 41 03 055 (1992-08-01), None

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