Transmission device between an input drive shaft and an output shaft, such as the shaft for driving the wheels of a travelling machine

A transmission device between an input drive shaft (1) and an output shaft (2), or a shaft for driving the wheels of a travelling machine, comprising:

• a housing (3);
• and
• a reduction gear mechanism and a progressive cone clutch mechanism (6) placed at least partially in the housing, the reduction gear mechanism comprising
• a driving member (4),
• a driven member (5) engaged with the driving member, and
• a gearwheel (5) forming the driven member (5), the gearwheel being mounted so as to rotate freely on the output shaft (2) and able to be coupled to/uncoupled from the output shaft (2) by means of two friction cones (6) of the clutch mechanism, the cones being placed coaxial to an axial bore (7) of the gearwheel (5) and capable of coming, under action of a control device (17), into bearing contact with a conical bearing surfaces (8) of the gearwheel (5), wherein
• the conical bearing surfaces (8) of the gearwheel (5) are, relative to the axis of rotation of the gearwheel (5), offset axially from gear teeth (9) of the gearwheel (5) and are placed on the same side of the gear teeth (9).