Hydraulic actuator and variable valve driving mechanism making u

Details Hydraulic actuator and variable valve driving mechanism making u Hydraulic actuator and variable valve driving mechanism making u

1997-04-10

1998-09-22

Lo, Weilun

Internal-combustion engines

Poppet valve operating mechanism

With means for varying timing

123 9031, 92121, F01L 1300, F15B 1512

Patent

active

058099557

ABSTRACT:
A hydraulic actuator is provided with a housing with an oil compartment formed therein; a power output shaft rotatably supported on the housing and extending out from an interior of the oil compartment to an exterior of the housing; a vane radially extending out from the power output shaft and maintained in contact with an inner wall of the oil compartment, whereby the vane divides the oil compartment into a first oil compartment and a second oil compartment; a first hydraulic pressure passage communicating the first oil compartment and a hydraulic pressure source with each other; a second hydraulic pressure passage communicating the second oil compartment and the hydraulic pressure source with each other; and an oil control valve regulating at least one of a first hydraulic pressure to be supplied to the first oil compartment through the first hydraulic pressure passage and a second hydraulic pressure to be supplied to the second oil compartment through the second hydraulic pressure passage. The power output shaft is specified in its rotated position by the first and second hydraulic pressures acting on the vane. A variable valve driving mechanism making use of the hydraulic actuator is also disclosed.

REFERENCES:
patent: 3633555 (1972-01-01), Raggi
patent: 3670627 (1972-06-01), Valantin
patent: 4565119 (1986-01-01), Higuchi
patent: 4633759 (1987-01-01), Schulze
patent: 4759186 (1988-07-01), Sugden
patent: 5365896 (1994-11-01), Hara et al.
patent: 5367992 (1994-11-01), Butterfield et al.
patent: 5507254 (1996-04-01), Mechior
patent: 5634392 (1997-06-01), Najork et al.

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