Hydraulic valve lift device

Details Hydraulic valve lift device Hydraulic valve lift device

1983-03-10

1984-06-05

Feinberg, Craig R.

Internal-combustion engines

Poppet valve operating mechanism

With means for varying timing

123 9055, F01L 134

Patent

active

044521871

ABSTRACT:
A hydraulic valve lift device for internal combustion engines includes a lifter having therein an oil pressure chamber for introduction of oil and slidably disposed in a cylindrical bore of a housing with one end thereof engaged by a cam or a cam shaft, and a plunger slidably disposed in the lifter for opening and closing an intake or exhaust valve of which a valve lift is variable depending upon the rotational speed of the cam by discharging oil from the oil pressure chamber through a throttling port. A braking chamber is defined by a flange portion of the plunger and the cylindrical bore, and is communicated through a slit with a oil feed chamber adapted to allow oil to flow thereinto. A relief valve is provided for communicating with the braking chamber to control its oil pressure below a set value. A control device is provided for controlling the relief valve depending upon an output of a detector such that the set force of the valve corresponds with a desired value.

REFERENCES:
patent: 3439661 (1969-04-01), Weiler
patent: 3490423 (1970-01-01), Shunta et al.
patent: 3518976 (1970-07-01), Thuesen
patent: 3817228 (1974-06-01), Bywater
patent: 4258671 (1981-03-01), Takizawa et al.
patent: 4347812 (1982-09-01), Kosuda et al.

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