Patent ID: 7640900
Filing Date: 2010-01-05
Classification: F01L,Y10T

Abstract:
1. A variable valve operating device for mechanically changing the operating characteristic of a valve relative to the rotation of a camshaft, the variable valve operating device comprising: a drive cam installed over the camshaft; a swing member that swings on a stationary shaft; a swing cam surface that is formed on the swing member, comes into contact with a valve support member, which supports the valve, and presses the valve in a lifting direction; a slide surface that is formed on the swing member so as to face the drive cam; an intermediate member that is positioned between the drive cam and the swing member and comes into contact with both the slide surface and a cam surface of the drive cam; a control shaft that is positioned in parallel with the camshaft and capable of changing the rotation position continuously or stepwise; a control member that is installed over the camshaft and allowed to rotate; a support member that is mounted on the control member to support the intermediate member so that the intermediate member can be moved along a predetermined path in relation to the control member; a first gear that is installed over the control shaft to rotate together with the control shaft; and a second gear that is installed over the control member to mesh with the first gear; wherein the intermediate member includes a first roller, which has a large diameter and comes into contact with a cam surface of the drive cam; a second roller, which is positioned concentrically with the first roller, has a small diameter, and comes into contact with the slide surface; and a coupling shaft, which couples the first roller and the second roller so that the first roller and the second roller can rotate independently; and wherein the slide surface is curved toward the drive cam.