Internal-combustion engines – Poppet valve operating mechanism – With means for varying timing
Patent
1998-03-16
2000-10-10
Lo, Weilun
Internal-combustion engines
Poppet valve operating mechanism
With means for varying timing
123 9031, F01L 1300
Patent
active
061290602
ABSTRACT:
A camshaft phase changing apparatus for an internal combustion engine has a control valve interposed in a hydraulic circuit. The control valve controls the connection between one of first and second hydraulic passages and the hydraulic supply passage and the connection between the other of the first and second hydraulic passages to the hydraulic drain passage according to the engine driving condition. The first and second hydraulic passages are linked to a corresponding one of an advance-angle side hydraulic chamber and a retardation-angle side hydraulic chamber defined between a rotatable main body and a sleeve fitted on the camshaft. The control valve has a first port connecting the hydraulic drain passage to either the first or second hydraulic passage, and a second port connecting the hydraulic supply passage to the other of the first or second hydraulic passage. The first port has a cross-sectional area that is narrower than that formed on the second port when a cam phaser thereof is moved to adjust a rotational phase relationship between a rotary body and the camshaft.
REFERENCES:
patent: 5203290 (1993-04-01), Tsuruta et al.
patent: 5301639 (1994-04-01), Satou
patent: 5309873 (1994-05-01), Suga et al.
patent: 5669343 (1997-09-01), Adachi
patent: 5722356 (1998-03-01), Hara
patent: 5765518 (1998-06-01), Nakano
patent: 5799631 (1998-09-01), Nakamura
Lo Weilun
Unisia Jecs Corporation
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