Rotational phase adjusting apparatus having stopper piston

Details Rotational phase adjusting apparatus having stopper piston Rotational phase adjusting apparatus having stopper piston

1997-09-18

1998-11-10

Lo, Weilun

Internal-combustion engines

Poppet valve operating mechanism

With means for varying timing

123 9031, 74565R, 464 2, F01L 1344

Patent

active

058328874

ABSTRACT:
In a rotational phase adjusting apparatus which may be used for adjusting valve timing of an engine, a stopper piston is set engageably into and disengageably from a tapered hole of a shoe housing so that relative pivotal motion between the shoe housing and a vane rotor is constrained at the most retarted position. A hydraulic pressure chamber communicates with a retard-side hydraulic pressure chamber while a hydraulic pressure chamber communicates with an advance-side hydraulic pressure chamber. A pressurized area of the stopper piston receiving hydraulic pressure from the hydraulic pressure chamber in a direction of releasing constraint is set to be larger than a pressurized area of the stopper piston receiving hydraulic pressure from the hydraulic pressure chamber in the direction of releasing constraint. When working oil is supplied to the advance-side hydraulic pressure chamber from a state where the stopper piston is fitted into the tapered hole, the stopper piston is drawn out from the tapered hole assuredly even in the case of low hydraulic pressure.

REFERENCES:
patent: 4858572 (1989-08-01), Shirai et al.
patent: 5107804 (1992-04-01), Becker et al.
patent: 5450825 (1995-09-01), Geyer et al.
patent: 5666914 (1997-09-01), Ushida et al.

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