Engine rocker arm cover having reduced noise transmission

Details Engine rocker arm cover having reduced noise transmission Engine rocker arm cover having reduced noise transmission

1998-12-10

2000-07-11

Lo, Weilun

Internal-combustion engines

Poppet valve operating mechanism

Lubrication

123195C, 123198E, F02B 7700, F02F 700

Patent

active

060857099

ABSTRACT:
The rocker arm cover on a diesel engine can be formed of a rigid molded plastic material to minimize the transmission of noise into the atmosphere. Sonic vibration of the cover can be reduced by reducing the cover material stiffness. The reduced stiffness of the cover material allows the roof area of the cover to be momentarily displaced away from the cylinder head in the presence of an acoustic wave, so that the roof area is not able to develop the restoring force that is necessary for vibrational motion.

REFERENCES:
patent: 4492189 (1985-01-01), Ogawa et al.
patent: 4498433 (1985-02-01), Ogawa
patent: 4522165 (1985-06-01), Ogawa
patent: 4593659 (1986-06-01), Wells et al.
patent: 5323740 (1994-06-01), Daily et al.
patent: 5513603 (1996-05-01), Ang et al.

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