Patent ID: 8051733
Filing Date: 2011-11-08
Classification: F16H,Y10T

Abstract:
1. A transmission for a vehicle comprising: a main shaft to which power from an engine is adapted to be transmitted; a counter shaft connected to a drive wheel; a plurality of gear trains (G a shifter relatively nonrotatably and slidably supported to said main shaft or said counter shaft to change the established condition of said gear trains (G a feed mechanism for sliding said shifter in the axial direction of said main shaft or said counter shaft; wherein in sliding said shifter to change the established condition of said gear trains (G said feed mechanism is configured to reduce the sliding speed of said shifter in a neutral condition, or to cause the sliding operation of said shifter in the neutral condition to have a single stopping action during the sliding operation of said shifter in changing the established condition of said gear trains (G further comprising: a shift fork for rotatably retaining said shifter; a shift drum having a lead groove on the outer circumference thereof for engaging said shift fork; and a shift drum center rotating with said shift drum; wherein said feed mechanism has a shifting motor and rotationally drives said shift drum center by a predetermined angle according to the operation of said shifting motor; and said feed mechanism is configured to reduce the rotational speed of said shift drum center in the neutral condition, or to cause the rotation of said shift drum center in said neutral condition to have the single stopping action during the sliding operation of said shifter in changing the established condition of said gear trains (G said lead groove formed on the outer circumference of said shift drum so as to engage said shift fork for rotatably retaining said shifter, said lead groove including: a first gear train establishing portion extending in the circumferential direction of said shift drum so as to bring said shifter into engagement with one of said idle gears, a second gear train establishing portion offset from said first gear train establishing portion in the axial direction of said shift drum and extending in the circumferential direction of said shift drum so as to bring said shifter into engagement with the other of said idle gears, a connecting portion for connecting said first gear train establishing portion and said second gear train establishing portion, and a neutral portion for holding said shifter at a position where said shifter is disengaged from both of said idle gears, said neutral portion being formed at the center of said connecting portion so as to extend in the circumferential direction of said shift drum.