Variable valve timing device

Details Variable valve timing device Variable valve timing device

1997-12-11

1998-10-27

Lo, Weilun

Internal-combustion engines

Poppet valve operating mechanism

With means for varying timing

123 9031, 74568R, 464 2, 464160, F01L 1344

Patent

active

058265520

ABSTRACT:
A variable valve timing device includes a rotation shaft and a rotation transmitting member rotatably mounted thereon so as to define a pressure chamber between the shaft and the member. The pressure chamber is divided by a vane extending from the shaft into an advance angle space and a delay angle space. Differentiating pressures in both spaces establishes rotation of the shaft, which enables an adjustment of the phase angle between the shaft and the member. A retracting bore and a receiving bore are formed in the member and the shaft, respectively. A locking valve and a piston are fitted in the retracting bore and the receiving bore, respectively. A fluid passage is formed which extends to a boundary portion between the piston and the locking valve.

REFERENCES:
patent: 4858572 (1989-08-01), Shirai et al.
patent: 5666914 (1997-09-01), Ushida et al.
patent: 5724929 (1998-03-01), Mikame et al.
patent: 5738056 (1998-04-01), Mikame et al.

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