Patent ID: 8656799

Claim:
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 ).