Massey Ferguson, S.a.

Massey-ferguson Services N.v.

Jean-Jacques Lasoen

A vehicle transmission unit is housed in a casing and includes a plurality of drive ratio paths selectively engageable by a ratio selection system. The ratio selection system includes fluid-pressure-operated actuators under the control of solenoid-operated valves to select the operative drive ratio of the transmission. The transmission also includes one or more mechanical actuator members accessible from outside the casing which can be manipulated to select one or more drive ratios of the unit in the event of the failure of the fluid-pressure-operated actuators or valves.

Transmission shifting apparatus having manually operable selector shaft

A continuously variable transmission includes an input shaft, an output shaft, and first and second epicyclic gear trains, each with an input member, an output member and a reaction member. An hydrostatic shunt loop including first and second hydraulically interconnected variable displacement hydraulic units interconnects the two epicyclic gear trains. The input members of both epicyclic gear trains are driven from the input shaft, and the output members of both epicyclic gear trains drive the output shaft. First and second drive trains are provided for alternatively coupling the first variable displacement hydraulic unit respectively to either the input shaft or the reaction member of the first epicyclic gear train. Third and fourth drive trains are provided for alternatively coupling the second variable displacement hydraulic unit respectively to either the output shaft or the reaction member of the second epicyclic gear train. A transmission control system is provided for selective operation of the first, second, third, and fourth gear trains to operate the transmission in three modes. In the first mode, the second and third gear trains are operational to utilize the first epicyclic only with its reaction member connected to the output shaft via the hydrostatic shunt loop. In the second mode, the second and fourth gear trains are operational to utilize both epicyclics with their reaction members interconnected via the hydrostatic shunt loop. Finally, in the third mode, the first and fourth gear trains are operational to utilize the second epicyclic only with its reaction member connected to the input shaft via the hydrostatic shunt loop.

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Villepreux, France

Jean-Jacques Lasoen