Patent ID: 7424873
Filing Date: 2008-09-16
Classification: F01L

Abstract:
1. A variable valve mechanism for changing lift amount and operating angle of an internal combustion engine valve disc, the variable valve mechanism comprising: a first cam, which rotates in accordance with crankshaft rotation; a transmission member that includes a second cam, which oscillates in synchronism with the rotation of the first cam and transmits a force exerted by the first cam to the valve disc; a control shaft, which is adjusted for a predetermined rotation position, the control shaft having the transmission member pivotally engaged thereon; an adjustment mechanism for varying the lift amount and operating angle of the valve disc by changing an oscillation range of the transmission member in accordance with the rotation position of the control shaft; a lost motion spring for pressing the transmission member toward the first cam to ensure that the transmission member remains coupled to the first cam; and an assist spring for pressing the transmission member in resistance to a force exerted by the lost motion spring.