Variable valve timing and lift system

Details Variable valve timing and lift system Variable valve timing and lift system

1998-04-06

1999-12-07

Lo, Weilun

Internal-combustion engines

Poppet valve operating mechanism

With means for varying timing

123 9017, 123 906, F01L 1300

Patent

active

059965401

ABSTRACT:
A variable valve timing and lift system comprises a camshaft having a rotary cam and a valve operating (VO) cam, and a control rod having an integral portion. The integral portion in the form of an eccentric cam supports a rocker arm. The rotary cam is fixed to the camshaft. The VO cam is in contact with a valve lifter for a cylinder valve of an engine. A torsion spring winds about the camshaft to apply a bias to the VO cam. The rocker arm has a first arm cooperating with the rotary cam and a second arm cooperating with a projecting radial lever of the VO cam. Under the action of the torsion spring, the lever of the VO cam is held in engagement with the second arm of the rocker arm and the second arm of the rocker arm is held in engagement with the rotary cam.

REFERENCES:
patent: 4397270 (1983-08-01), Aoyama
patent: 4572118 (1986-02-01), Baguena
patent: 5148783 (1992-09-01), Shinkai et al.
patent: 5431132 (1995-07-01), Kreuter et al.
patent: 5586527 (1996-12-01), Kreuter
patent: 5592906 (1997-01-01), Kreuter et al.
patent: 5732669 (1998-03-01), Fischer et al.
patent: 5787849 (1998-08-01), Mitchell
patent: 5899180 (1999-05-01), Fischer

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