Patent ID: 6302819
Filing Date: 2001-10-16
Classification: F16H

Abstract:
An infinite speed ratio transmission device for a vehicle comprising:an input shaft;a final output shaft;a continuously variable transmission having a first sprocket and transmitting a rotation of the input shaft to the first sprocket at an arbitrary speed ratio;a fixed speed ratio transmission comprising an output gear formed on the final output shaft and an input gear which inputs the rotation of the input shaft and which is meshed with the output gear;a second sprocket formed on the final output shaft;a chain which transmits the rotation of the first sprocket to the second sprocket;a device output gear formed on the final output shaft;a final gear meshed with the device output gear; anda planetary gear set which causes the final output shaft to rotate according to the relative rotation of the second sprocket and the output gear;wherein the gear set of the device output gear and the final gear comprises helical gears having a slanting tooth trace, an angle made by a first line joining the input shaft and the final output shaft and a second line joining the center of the final gear and the final output shaft, is set to be less than 90 degrees, and the helical gears have tooth traces which, when a rotation is transmitted from the device output gear to the final gear, exert a thrust force parallel to the final output shaft on the device output gear in a direction of the second sprocket, so that the helical gears, when rotating, exerts a moment on the final output shaft in a direction to suppress a bending stress in the final output shaft due to a tension of the chain.