Patent ID: 7591238
Filing Date: 2009-09-22
Classification: F01L

Abstract:
1. A variable valve-operating device comprising: a first valve and a second valve aligned with each other and positioned on the intake side or the exhaust side of a cylinder in an internal combustion engine; a first drive cam installed over a camshaft; a control shaft positioned parallel with the camshaft and being capable of changing the rotation position continuously or stepwise; a first swing cam arm provided for the first valve to swing around the control shaft; a second swing cam arm provided for the second valve and being capable of swinging independently of the first swing cam arm; swing cam surfaces formed on the first swing cam arm and the second swing arm, and coming into contact with a valve support member, which supports the first valve and the second valve, to push the first valve and the second valve in a lifting direction; slide surfaces formed on the first swing cam arm and the second swing cam arm to face the first drive cam; an intermediate member sandwiched between the first drive cam and the slide surfaces of the first swing cam arm and of the second swing cam arm, and coming into contact with a circumferential surface of the first drive cam; a first pushing means for pushing the first swing cam arm in the circumferential direction of the control shaft so as to press the slide surface of the first swing cam arm against the intermediate member; a second pushing means for pushing the second swing cam arm in the circumferential direction of the control shaft so as to press the slide surface of the second swing cam arm against the intermediate member; an interlock mechanism for moving the intermediate member along the circumferential surface of the first drive cam in coordination with the rotation of the control shaft to change the position of the intermediate member in relation to the center of the camshaft; a second drive cam installed over the camshaft so as to be aligned with the first drive cam; an input arm installed over the control shaft in a rotatable manner, positioned adjacent to the second swing cam arm, and swinging upon receipt of a driving force input from the second drive cam; and coupling means for coupling the second swing cam arm to the input arm.