Hydraulic valve lift device

Details Hydraulic valve lift device Hydraulic valve lift device

1979-04-27

1982-09-07

Feinberg, Craig R.

Internal-combustion engines

Poppet valve operating mechanism

Tappet

123 9016, F01L 124

Patent

active

043478123

ABSTRACT:
A hydraulic valve lift device for transmitting the motion of a cam to a push rod of an intake or exhaust valve of an engine, including a housing, a lifter slidably engaged by the housing and provided therein with an oil pressure chamber adapted to receive an oil, and a plunger provided with a flange portion and slidable in relation to the lifter. The flange portion of the plunger and cylindrical bore of the housing cooperate with each other to define therebetween a braking chamber into which oil is introduced. The device has a slit through which the oil in the braking chamber is relieved to the outside. The arrangement is such that the rate of oil relieved through the braking chamber is reduced as the plunger is lowered. The device further includes a relief valve for maintaining the pressure in the braking chamber below a predetermined pressure level.

REFERENCES:
patent: 3490423 (1968-06-01), Shunta et al.
patent: 3636932 (1972-01-01), Hamilton et al.
patent: 3727595 (1973-04-01), Links
patent: 4111165 (1978-09-01), Aoyama et al.
patent: 4112884 (1978-09-01), Tominaga

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