Internal-combustion engines – Poppet valve operating mechanism – With means for varying timing
Patent
1980-08-15
1983-10-11
Feinberg, Craig R.
Internal-combustion engines
Poppet valve operating mechanism
With means for varying timing
123 9055, F01L 134
Patent
active
044085800
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 on 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: 2484109 (1949-10-01), Meinecke
patent: 2942595 (1960-06-01), Bergmann et al.
patent: 3439661 (1969-04-01), Weiler
patent: 3490423 (1970-01-01), Shunta et al.
patent: 4218995 (1980-08-01), Aoyama
patent: 4258671 (1981-03-01), Takizawa et al.
patent: 4347812 (1982-09-01), Kosuda et al.
Kosuda Toru
Matsubara Noboru
Takeuchi Yasuhiro
Takizawa Masaaki
Feinberg Craig R.
Nippon Soken Inc.
Toyota Jidosha Kogyo Kabushiki Kaisha
Wolfe W. R.
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