Patent ID: 7556003
Filing Date: 2009-07-07
Classification: F01L,Y10T

Abstract:
1. An engine valve operating system comprising a rocker arm ( 63 ) which has a cam abutting portion ( 65 ) abutting against a valve operating cam ( 69 ) and is interlocked and connected so as to apply a force in a valve opening direction to an engine valve ( 19 ) biased by a valve spring ( 24 ) in a valve closing direction, a first link arm ( 61 ) having one end turnably connected to the rocker arm ( 63 ) and the other end turnably connected at a fixed position of the engine body ( 10 ), a second link arm ( 62 ) having one end turnably connected to the rocker arm ( 63 ) and the other end turnably supported by a displaceable movable shaft ( 68 a ), driving means ( 72 ) connected to the movable shaft ( 68 a ) to enable a position of the movable shaft ( 68 a ) to be displaced in order to continuously vary the lift amount of the engine valve ( 19 ), and a rocker arm biasing spring ( 54 ) which is different from the valve spring ( 24 ) and which biases the rocker arm ( 63 ) in a direction in which the cam abutting portion ( 65 ) abuts against the valve operating cam ( 69 ).