Valve train for an internal combustion engine

Details Valve train for an internal combustion engine Valve train for an internal combustion engine

1994-06-07

1995-12-12

Yuen, Henry C.

Internal-combustion engines

Poppet valve operating mechanism

With means for varying timing

123 9044, F01L 118, F01L 112

Patent

active

054740371

ABSTRACT:
A valve train with a variable valve timing mechanism for at least one intake or exhaust valve E has a cam shaft with a low-speed cam and a high-speed cam. A first rocker lever interacts with the low-speed cam and the valve E. A second rocker lever interacts with the high-speed cam and can be connected to the first rocker lever via a coupling pin. To press the second rocker lever against its cam, a spring system is provided and this is formed by at least one spring, which, during the base circle phase, rests in a prestressed state directly or indirectly against a fixed stop and the rocker lever is thus relieved of load in order to reduce friction and wear.

REFERENCES:
patent: 2117433 (1938-05-01), Krebs
patent: 4787346 (1988-11-01), Ajiki et al.
patent: 4957076 (1990-09-01), Inoue et al.
patent: 4970997 (1990-11-01), Inoue et al.
patent: 5095859 (1992-03-01), Iwata et al.
patent: 5101778 (1992-04-01), Fukuo et al.
patent: 5159905 (1992-11-01), Sugiuchi et al.

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