Chain belt-type variable transmission

摘要

A chain belt-type continuously variable transmission in which ratchet-type chain belts are wound on driving and driven pulley devices, each of which has a variable diameter, in order to control the shift ratio. Driving belt supports are disposed in a driving pulley device so as to radially contract and expand. Driven belt supports are disposed in a driven pulley device so as to radially contract and expand. Teeth in the front portions of the driving belt supports and the driven belt supports and teeth in the rear portions of the driving belt supports and the driven belt supports are oriented in opposite directions. Front and rear ratchet gears formed on the driving belt supports and the front and rear ratchet gears formed on the driven belt supports are oriented in opposite directions and are arranged in alternating positions without being formed at corresponding positions in a line.

主权项

1. A chain belt-type continuously variable transmission comprising a ratchet-type chain belt which is wound between a driving pulley device which receives power from an input shaft and a driven pulley shaft which transmits the power to an output shaft, wherein:
each of the driving and driven. pulley devices includes pulley plates which are disposed in front of and behind a cylinder which is disposed in a central portion of a pulley shaft and operates in response to a hydraulic pressure that is input and output via first and second flow passages, the pulley plates facing each other, each of the pulley plates having a plurality of radial slide slots and shift plates are disposed on the pulley shaft outside the front and rear pulley plates, the shift plates having involute grooves corresponding to the slide slots, the shift plates being guided by spiral ribs on the pulley shaft so as to spirally rotate, belt supports are disposed between the front and rear pulley plates such that the belt supports are radially guided so as to contract or expand, both ends of the belt supports being inserted into the involute grooves of the shift plates through the slide slots so as to be guided thereby, front and rear ratchet gears are provided on front and rear portions of upper surfaces of bodies of the belt supports, teeth of the front and rear ratchet gears being oriented in opposite directions, the teeth of the front and rear ratchet gears formed on the driving belt supports being oriented opposite to the teeth of the front and rear ratchet gears formed on the driven belt supports, and the front and rear ratchet gears formed on the driving belt supports and the front and rear ratchet gears formed on the driven belt supports are arranged in alternating positions without being formed at corresponding positions in a line, and the ratchet-type chain belts include first and second chain belts which are wound on front and rear portions of the driving and driven pulley devices, each of the first and second chain belts having forward ratchets and reverse ratchets on an inner surface thereof which are configured so as to correspond to and are caught by the front and rear ratchet gears formed on the driving and driven belt supports.