초록 ▼

A reaction differential is disclosed which is preferably used in a hydrostatic steering differential for accurately steering a casemate vehicle at very low speeds for precise aiming of a gun which is aimed in azimuth by steering. The reaction differential is driven in selected direction by a hydrost

A reaction differential is disclosed which is preferably used in a hydrostatic steering differential for accurately steering a casemate vehicle at very low speeds for precise aiming of a gun which is aimed in azimuth by steering. The reaction differential is driven in selected direction by a hydrostatic motor only after the motor is rotated at an rpm which will provide smooth motor performance before sufficient torque is provided to initiate steering of the vehicle.

대표청구항 ▼

A hydrostatic reaction steering transmission for a mobile vehicle, which transmission includes power means connected in driving engagement to rotatable right and left brake drum carriers that are connected in driving engagement to right and left ground engaging elements through right and left planet

A hydrostatic reaction steering transmission for a mobile vehicle, which transmission includes power means connected in driving engagement to rotatable right and left brake drum carriers that are connected in driving engagement to right and left ground engaging elements through right and left planetary gear trains, right and left operator controlled brake means for simultaneously stopping or releasing said brake drum carriers for rotation, a steering gear train operatively connected between a steering input shaft and said right and left planetary gear trains for driving the right and left planetary gear trains in opposite directions when said brake drum carriers are stopped and for applying steering torque in opposite directions when said brake drums are released in response to rotation of said steering input shaft, and operator controlled variable speed reversible steering drive means for maintaining said steering input shaft stationary or for driving said input shaft in selected directions; the improvement which comprises means defining a reaction steering differential, said reaction steering differential including a housing within which said differential input and output shafts are journaled, differential means within said housing including a planetary gear train having an input portion operatively connected to said differential input shaft and an output portion operatively connected to said differential output shaft, and torque controlling means within said housing operatively connected to said output portion of said planetary gear train, said torque controlling means being effective to compensate for low speed inaccuracies in said steering drive means by controlling differential input shaft speeds from said steering drive means that are faster than about 40 revolutions per minute before sufficient torque is provided to rotate said steering input shaft. An apparatus according to claim 1 wherein said vehicle is a casemate military vehicle having a chassis with a gun secured thereto that is aimed in azimuth by steering the vehicle; said steering differential enabling said vehicle to be steered in place with said brakes locked and to precisely aim the gun in azimuth at low speed rates of about 0.5 mil per second.