Patent ID: 6701796
Filing Date: 2004-03-09
Classification: F16H,Y10T

Abstract:
Transmission device between a primary motor shaft and an output shaft (1), comprising at least one casing (2) within which are disposed a reducing mechanism constituted by a driving member (3) in engagement with a driven member (4), the driven member (4), freely mounted rotatably on the output shaft (1), being adapted to be coupled with or uncoupled from said shaft (1) by means of a clutch mechanism mounted on said output shaft (1),wherein the driven member (4) is a tangent toothed wheel, of synthetic material, at least a constituent material of the teeth (5) of the toothed wheel (4) incorporating a mineral or organic load increasing the resistance to wear of said teeth (5), wherein the clutch mechanism is a dog clutch mechanism constituted by two hollowed plates (7, 8) bearing on their facing surfaces teeth (10), one (7) of the plates (7, 8) being secured in rotation to the toothed wheel (4) whilst the other plate (8) that can be secured in rotation with the output shaft (1) is movable axially under the action of a control member (11) for clutching in the direction toward the one of the plates (7) secured in rotation to the toothed wheel (4) such that the teeth (10) of the plates (7, 8) will be disposed between them so as to ensure, under the influence of driving in rotation the toothed wheel (4), a driving in rotation of the axially movable plate (8) and hence a driving in rotation of the output shaft (1) of the device, and wherein the control member (11) of the clutching mechanism comprises a fork with two branches, each branch of the fork being provided with a radial internal tooth (12) so as to ensure trapping the fork within an annular throat (13) external to the axially movable plate (8).