Valve timing control device for use in internal combustion engin

Details Valve timing control device for use in internal combustion engin Valve timing control device for use in internal combustion engin

1988-06-15

1989-09-05

Myhre, Charles J.

Internal-combustion engines

Poppet valve operating mechanism

Electrical system

123 9013, 123 9017, F01L 904

Patent

active

048628433

ABSTRACT:
A valve timing control device includes a rotatable shaft, a housing including a timing wheel axially immovable but angularly movable with respect to the timing wheel, a piston disposed coaxially with the rotatable shaft and the timing wheel, a hydraulic chamber for applying a hydraulic pressure to move the piston axially, a servovalve disposed between the hydraulic pressure chamber and hydraulic pressure supply and release passages and comprising a sleeve and a spool, an actuator for axially moving the spool, and a phase adjusting mechanism operatively coupling the piston, the housing, and the rotatable shaft for varying angular relationship between the timing wheel and the rotatable shaft in response to axial movement of the piston. The actuator may be a hydraulic actuator or an electric actuator. The phase adjusting mechanism may comprise roller pins mounted on the piston and rollingly fitted in a guide groove defined in the rotatable shaft and a guide slot defined in the housing, or meshing helical teeth on the piston, the housing, and the rotatable shaft.

REFERENCES:
patent: 4305352 (1981-12-01), Oshima et al.
patent: 4357917 (1982-11-01), Aoyama
patent: 4494495 (1985-01-01), Nakamura et al.
patent: 4494496 (1985-01-01), Nakamura et al.
patent: 4498431 (1985-02-01), Nakamura et al.
patent: 4517934 (1985-05-01), Papez
patent: 4561390 (1985-12-01), Nakamura et al.
patent: 4583501 (1986-04-01), Williams
patent: 4787345 (1988-11-01), Thoma

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