Valve operating system for internal combustion engine

Details Valve operating system for internal combustion engine Valve operating system for internal combustion engine

1989-08-01

1991-04-02

Myhre, Charles J.

Internal-combustion engines

Poppet valve operating mechanism

Hydraulic system

123 9015, 123 9016, F01L 134, F01L 902

Patent

active

050039377

ABSTRACT:
In a valve operating system for an internal combustion engine that includes a valve operation mode changing mechanism capable of changing at least one of either the lift amount of opening of an engine valve openably and closably carried in an engine body or the opening or closing timing in accordance with a variation in hydraulic pressure supplied to the changing mechanism. A selector valve is provided and includes a valve element slidably received in a housing attached to the engine body to change the supply of hydraulic pressure to the valve operation mode changing mechanism. The housing of the selector valve is provided with a working oil chamber which receives an oil pressure for driving, toward a position to supply a higher hydraulic pressure to the valve operation mode changing mechanism, a valve element biased toward a position to supply a lower hydraulic pressure to the valve operation mode changing mechanism. The working oil chamber is connected through a leak jet to a drain chamber provided in the engine body. The leak jet permits the hydraulic pressure to be quickly released from the working oil chamber when the valve element of the selector valve is driven to block the communication between the hydraulic pressure supply source and the valve operation mode changing mechanism, thereby leading to a quick changing operation of the valve operation mode changing mechanism.

REFERENCES:
patent: 4111165 (1978-09-01), Aoyama et al.
patent: 4674451 (1987-06-01), Rembold et al.
patent: 4716863 (1988-01-01), Pruzan
patent: 4800850 (1989-01-01), Yoshida et al.
patent: 4854273 (1989-08-01), Uesugi et al.
patent: 4858574 (1989-08-01), Fukuo et al.
English translation of Japanese 59-15614(A)-summary sheet.

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