Patent ID: 6666789
Filing Date: 2003-12-23
Classification: F16H

Abstract:
A frictional variable transmission for a vehicle comprising:a rotating unit rotated by an engine of the vehicle; a power-varying unit that varies, in a state of contacting the rotating unit, a rotational force transmitted from the rotating unit by moving in a predetermined direction; a hydraulic clutch mounted off-center from the rotating unit, and varying between states of frictional contact with or separation from the power-varying unit by hydraulic pressure generated according to a depressed state of a clutch pedal, thereby controlling transmission of rotational force of the power-varying unit; and a power transmitter linked to the movement of the hydraulic clutch so as to move responsive thereto, and transmitting a rotational force corresponding to an input state of rotational force transmitted through the rotating unit and the power-varying unit, wherein the power-varying unit comprises: a shift fork for being indexed with a shift lever of a vehicle; a shift rod positioned from a circumferential outer direction of the rotating unit to a circumferential inner direction of the rotating unit between the rotating unit and the hydraulic clutch; a shift ball mounted on the shift rod, and which, in a state of being connected to the shift fork, receives rotational force of the rotating unit according to movement from the circumferential outer direction to the circumferential inner direction of the rotation power unit, thereby rotating in a predetermined direction; a hole through which the shift rod passes for mounting of the shift ball on the shift rod; a fork-receiving portion to which the shift fork is connected such that the shift ball is enabled to move in the axial direction of the shift rod; and a rolling frictional surface formed roughly hemispherically under the fork-receiving portion.