Device for varying valve timing

Details Device for varying valve timing Device for varying valve timing

1997-10-29

1999-08-24

Lo, Weilun

Internal-combustion engines

Poppet valve operating mechanism

With means for varying timing

123 9031, F01L 1344, F01L 1300

Patent

active

059412020

ABSTRACT:
Disclosed is a device for varying valve timing and engaging a cam shaft, in particular for a V-type engine. The device includes a cam shaft on which cams are mounted, a cam shaft pulley for transmitting power from a crank shaft to the cam shaft, a plate for placing the cam shaft pulley in engagement with the cam shaft, and an electromagnet mounted on the cam shaft pulley, the electromagnet being selectively engaged with the plate when electric power is applied thereto. First and second locking pins are provided in the cam shaft for engaging the plate. The locking pins are arranged in relatively eccentric positions and have different radial positions. The engagement between the plate and the cam shaft is achieved selectively by engaging one of the locking pins with the plate. Structure is provided for controlling movement of the locking pins to engage the locking pins with the plate selectively and for applying electric power to the electromagnet according to driving conditions of a vehicle.

REFERENCES:
patent: 3978829 (1976-09-01), Takahashi et al.
patent: 4967701 (1990-11-01), Isogai et al.
patent: 5031585 (1991-07-01), Muir et al.
patent: 5261360 (1993-11-01), Voll et al.
patent: 5271360 (1993-12-01), Kano et al.
patent: 5305719 (1994-04-01), Clarke et al.
patent: 5435782 (1995-07-01), Tortul

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