Engine exhaust valve mechanism

Details Engine exhaust valve mechanism Engine exhaust valve mechanism

1995-05-31

1997-07-15

Lo, Weilun

Internal-combustion engines

Poppet valve operating mechanism

Rod

F01L 108

Patent

active

056473109

ABSTRACT:
In an exhaust valve of a reciprocating engine provided with a cam that rotates in synchronism with a crankshaft, and valve body opened by this cam, the cam shape is improved. The maximum value of the valve opening acceleration of the valve body is set to be less than the maximum value of the valve closing acceleration. Alternatively, the maximum value of the valve opening acceleration is set to be less than the maximum value determined by the operating limits of the valve body. In this way, the change of exhaust blowdown is made more gradual, and exhaust pulsation noise is reduced.

REFERENCES:
patent: 4538559 (1985-09-01), Imamura et al.
patent: 4909196 (1990-03-01), Nagahiro et al.
patent: 5215048 (1993-06-01), Kaiser et al.
patent: 5309872 (1994-05-01), Filippi et al.

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