Patent ID: 9062765
Filing Date: 2015-06-23
Classification: F16H,Y10T

Abstract:
1. A shift control device for a vehicle transmission in which a shift fork, for selectively establishing a gear train of multiple shift stages provided between a main shaft to which power from an internal combustion engine is transmitted and a countershaft connected to a driven wheel, engages with a lead groove provided in the outer periphery of a shift drum, a drive mechanism is provided for making the shift drum pivot, said drive mechanism being operatively connected to the shift drum, characterized in that the drive mechanism comprises: a hollow case member, an electric motor which is operatively attached to the case member and disposed proximate a first end, in the axial direction, of the shift drum, a transmission shaft running coaxially and relatively rotatably through the shift drum so that power from the electric motor is transmitted thereto at said first end, in the axial direction, of the shift drum, said transmission shaft being operatively connected to a second end, in the axial direction, of the shift drum, a barrel cam rotatably disposed in the case member between the electric motor and the transmission shaft, said barrel cam comprising a shaft having first and second cams affixed thereto, and first and second switches operatively attached to the case member and configured and arranged to be activatable by said first and second cams, respectively, upon rotation of said barrel cam, in order to determine whether or not the barrel cam is correctly rotating in response to operation of the electric motor, wherein the electric motor is disposed so as to have a rotational axis thereof perpendicular to the axis of the shift drum, and the transmission shaft is supported on the shift drum, and wherein the electric motor has its rotational axis disposed parallel to the rotational axis of the barrel cam.