Patent ID: 7966902

Claim:
A vehicular transmission, comprising: main shafts, to which power drive from an engine is to be transmitted; a countershaft connected to a drive wheel; gear trains (G 1 to G 5 ) of a plurality of gear positions disposed, to be selectively established, between the main shafts and the countershaft; shifters supported unrotatably and slidably on the main shafts or the countershaft to select an established state of the gear trains (G 1 to G 5 ); a shift drum including a plurality of lead grooves, in which a plurality of shift forks rotatably holding the shifters are engaged, formed on an outer periphery thereof; a shift drum center rotatable with the shift drum; a drum stopper arm urged toward a center of rotation of the shift drum center so as to engage an outer periphery of the shift drum center and thereby determine a position of rotation of the shift drum center; and an intermittent feed mechanism rotatably driving the shift drum center intermittently, the power drive from the engine to the main shafts being shut down when the established state of the gear trains (G 1 to G 5 ) is selected; wherein the shift drum center includes a plurality of gear train establishment notches disposed on the outer periphery of the shift drum center so as to be equally spaced apart from each other, the gear train establishment notches for establishing a specific gear train selected from among the gear trains (G 1 to G 5 ) by selectively engaging the drum stopper arm therein; and wherein the shift drum center further includes half neutral notches to be engaged with the drum stopper arm, the half neutral notches being disposed on the outer periphery of the shift drum center and at a central portion between each pair of the gear train establishment notches, respectively.