| 摘要 |
PROBLEM TO BE SOLVED: To provide a variable valve gear for an internal combustion engine that enables reduction in pump loss of the internal combustion engine and friction loss when a valve is operated.SOLUTION: A variable valve gear for an internal combustion engine includes: a rocker arm 5 pivotally supported by a support shaft 3 swingably and opening/closing an intake valve 4 along with the swinging operation; a swing arm 6 that has an intermediate portion pivotally supported by the rocker arm 5 swingably by using a fulcrum arm pin 8 and includes a first input roller 15 and a second input roller 13 at positions sandwiching the fulcrum arm pin 8; a cam 2 fixed to a cam shaft 1 and coming into contact with the first input roller 15 to lift the intake valve 4; and a hydraulic actuator 20 that has a tappet 23 coming into contact with the second input roller 13 and a hydraulic chamber 29 having a volume changed by working fluid and causing the tappet 23 to operate to appear/disappear in accordance with the change and that retracts the tappet 23 by contracting the volume of the hydraulic chamber 29 to close the intake valve 4 at any timing while the intake valve 4 is lifted by a cam crest of the cam 2.SELECTED DRAWING: Figure 7 |
