Patent ID: 7963184

Claim:
A vehicle transmission comprising: main shafts to which power from an engine can be transmitted; a counter shaft connected to drive wheels; a plurality of change gear stages of gear trains provided between said main shafts and said counter shaft so as to be capable of selective establishment; shifters relatively non-rotatably and slidably borne on said main shafts or said counter shaft so as to change over the establishment conditions of said plurality of change gear stages of gear trains; a shift drum provided at an outer periphery thereof with lead grooves for engagement with shift forks for rotatably holding said shifters; a shift drum center rotated together with said shift drum; and an intermittent feed mechanism for intermittently turningly driving said shift drum center, wherein said transmission of power from said engine to said main shafts is interrupted when said shifters are slid so as to change over the establishment conditions of said plurality of change gear stages of gear trains, said intermittent feed mechanism including: a drum shifter with at least a part thereof disposed in said shift drum center so as to be capable of turning about an axis coaxial with said shift drum center; a pair of pawls symmetrically mounted to said drum shifter so as to be tilted up and down in radial directions of said drum shifter; a pair of springs for respectively energizing said pawls in tilting-up directions; a plurality of engaging recesses provided at regular intervals along a circumferential direction at an inner periphery of said shift drum center so that both said pair of pawls can be engaged therewith; and a fixed guide plate for guiding from the radially outer side the tilted conditions of both said pawls according to the turning of said drum shifter, wherein said guide plate is provided with a large-diameter arcuate part larger in diameter than an outer periphery of the drum shifter and a small-diameter arcuate part smaller in diameter than the outer periphery of the drum shifter, and connecting parts connecting said large-diameter arcuate part and said small-diameter arcuate part to each other, and said connecting parts are so formed as to engage said pawls with said engaging recesses in the course of turning of said drum shifter by a turning amount necessary for changing over the establishment conditions of said plurality of change gear stages of gear trains.