Patent ID: 9309952
Filing Date: 2016-04-12
CPC Classification: B60Y,F16H

Claim Text:
1. A belt-type continuously variable transmission in which a movable sheave is provided with a hydraulic cylinder, which controls the feeding of hydraulic oil to the hydraulic cylinder by means of a hydraulic servo mechanism, wherein the hydraulic servo mechanism comprises: a servo spool which is biased so as to return to a neutral position and is coupled to a speed-change controller, the servo spool switches an oil passage to the hydraulic cylinder according to the operation of the speed-change controller; and a feedback spool enclosed slidably with respect to the servo spool and arranged so as to slide following a movable side cylinder casing constituting the hydraulic cylinder, the feedback spool switches the oil passage in such a manner that the sliding position of the movable sheave is retained at a position corresponding to the sliding position of the servo spool; and includes: a contact member coming into contact with the feedback spool between the hydraulic cylinder and the feedback spool; and comprises: a spool position maintaining mechanism that makes it possible for the contact member to slide in relation to the movable side cylinder casing when pressure in the hydraulic cylinder is lower than a predetermined value.