TORSION VIBRATION DAMPER IN TRANSMISSION

PURPOSE:To improve durability in a power transmission system plus driving comfortableness, by installing a torsion vibration damper on the circumference of a shaft in which a tubular shaft receiving torque transfer is rotatably fitted. CONSTITUTION:On an output shaft 5, a tubular shaft 11 to be torque-transferred from an input shaft 2 is rotatably supported, and when an engine is quickly accelerated, there produces a difference in revolution between the tubular shaft 11 and the output shaft 5. With this speed difference, a cylinder 18 receives a thrust toward a 3-speed driven gear 123 from a helical spline 17. And, by this thrust, the cylinder 18 is slidden to the side of the 3-speed driven gear 123 against the resilient force of a spring 27 and, following this slide motion, buffer oil in a second oil chamber 25 is transferred to a first oil chamber 25, by way of an orifice 26. With compression deformation in the spring 27 and choke resistance in the orifice 26, a torque variation in the input shaft 2 is absorbed, thus revolution of the output shaft 5 goes up smoothly.