Internal-combustion engines – Poppet valve operating mechanism – With means for varying timing
Patent
1985-12-26
1987-09-29
Lazarus, Ira S.
Internal-combustion engines
Poppet valve operating mechanism
With means for varying timing
123 9012, 123 9055, F01L 124, F01L 134
Patent
active
046962654
ABSTRACT:
A device for varying a valve timing and lift for an internal combustion engine comprises a first valve lifter and a second valve lifter, and an oil pressure chamber being defined between the first valve lifter and the second valve lifter. The flow of oil from the oil pressure chamber is continuously and steplessly controlled through a high-speed response control valve in an oil extraction passage. While the oil is being removed, the valve does not lift. When the high-speed response control valve is closed, the first valve lifter and the second valve lifter move together and the valve begins to lift. By controlling the action of the actuator of the high-speed response control valve, the valve timing and lift of the poppet valve can be controlled to the optimum ones matching the engine operating conditions.
REFERENCES:
patent: 4218995 (1980-08-01), Aoyama
patent: 4258671 (1981-03-01), Takizawa et al.
patent: 4347812 (1982-09-01), Kosuda et al.
patent: 4408580 (1983-10-01), Kosuda et al.
patent: 4452187 (1984-06-01), Kosuda et al.
patent: 4466390 (1984-08-01), Babitzka
Lazarus Ira S.
Toyota Jidosha & Kabushiki Kaisha
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