Patent ID: 8549944
Filing Date: 2013-10-08
Classification: F16D,F16H,Y10T

Abstract:
1. A multi-stage transmission wherein a drive gear shaft and a driven gear shaft are disposed in parallel; a plurality of drive gears and a plurality of driven gears are supported on the drive gear shaft and the driven gear shaft, respectively, in a manner that the drive gears and the driven gears are constantly meshed with each other to constitute meshing gear combinations for different speeds; one of the drive gears and the driven gears are fixed to the gear shaft supporting the same, while the gear shaft supporting the other of the drive gears and the driven gears is a hollow gear shaft; and the other gears are supported on the hollow gear shaft individually in an engageable and disengageable manner through engaging means, which are operated by gear shift driving means for gear shift: said engaging means comprises: engaging projections formed on an inner peripheral surface of each of the other gears at circumferentially spaced locations and having engaging surfaces in circumferential directions; cam rods being in sliding contact with an inner peripheral surface of the internal hole in the hollow gear shaft so as to be movable in an axial direction wherein each of said cam rods includes, in a sliding contact surface thereof, a plurality of cam grooves at axially spaced locations; pin members inserted in radial through-holes formed in the hollow gear shaft, respectively, said pin member being advanced and retreated while alternately making contact with said sliding contact surface of each of the cam rods and with the cam grooves; and swing pawl members swingably supported on pivot pins provided on the hollow gear shaft, said swing members being swingable by advance/retreat of the pin members to be thereby engaged with or disengaged from the engaging projections; each of the swing pawl members having one end part on one side of a swing center formed by each of the pivot pins, for engagement with each of the engaging surfaces of each of the projections and another end part on the opposite side of the swing center to be pushed up by each of the pin members for disengaging the one end part from each of the engaging surfaces of each of the projections.