| 摘要 |
The invention relates to a transmission device between a primary drive shaft and an output shaft ( 1 ), such as a wheel drive shaft, of an automotive machine, such as a lawnmower, of the type comprising a housing ( 2 ) inside of which is housed at least partially a reduction gear mechanism that consists of an engine-driving element ( 3 ), such as an endless screw, meshed with a driven element ( 4 ), such as a gearwheel, the driven element ( 4 ) being likely to be coupled to or uncoupled from said output shaft ( 1 ) by means of a clutch mechanism that is activated/deactivated by axial movement of the gearwheel ( 4 ) on the shaft. This transmission device is characterized in that the clutch mechanism, retracted to the disengaged position, assumes the shape of a plate ( 6 ) that is integral in rotation with the output shaft ( 1 ), whereby this clutch cover plate ( 6 ) is provided, on its face opposite the gearwheel ( 4 ), with ramps designed to work during the engagement phase with ramps that are supported by the gearwheel ( 4 ), whereby this engagement is obtained by axial movement controlled by the gearwheel ( 4 ) on the shaft ( 1 ) in the direction in which the gearwheel ( 4 ) moves toward said plate ( 6 ), whereby this movement is controlled by an actuating element with manual control, preferably movable angularly, such as a fork ( 5 ).
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