Patent ID: 7267088
Filing Date: 2007-09-11
Classification: F01L,F02D,F02M,Y02T

Abstract:
1. A valve-driving system which is applied to an internal combustion engine having a plurality of cylinders for driving an intake or exhaust valve provided in each cylinder, comprising a plurality of valve-driving apparatuses, each of which is provided for at least each one of the intake valve and the exhaust valve, wherein each valve-driving apparatus comprises: an electric motor as a driving source for generating rotation motion; and a power transmission mechanism for converting the rotation motion of the electric motor into an opening and closing motion of the valve to be driven and for transmitting the opening and closing motion to the valve through a cam, wherein the valve-driving apparatus further comprises a torque fluctuation suppressing mechanism which includes a rotation member that is provided in a motion transmitting path extending from the electric motor to the cam, and the torque fluctuation suppressing mechanism applies a reaction torque to the rotation member so that the reaction torque cancels the fluctuation of a torque which is applied to the cam.