Combined belt and hydrostatic vehicle drive

Details Combined belt and hydrostatic vehicle drive Combined belt and hydrostatic vehicle drive

B - Operations, Transporting

60

K

180/50

B60K 17/04 (2006.01) F16H 7/10 (2006.01)

Patent

CA 1077400

COMBINED BELT AND HYDROSTATIC VEHICLE DRIVE Abstract of the Disclosure A self-propelled combine has a power source that is con- nected to a hydrostatic drive for the drive wheels by means of a belt drive, that includes a pair of coaxial idler sheaves mounted on a freely swingable arm, one sheave being connected to an input sheave by a first belt and the other idler sheave being connected by a second drive belt to an output sheave that drives the pump of the hydrostatic drive. The arm that mounts the idler sheaves is articulated, and a hydraulic cylinder between the two sections of the arm controls the distance between the idler sheave axis and the arm pivot, which in turn controls the tension in the two belts. The hydraulic cylinder is connected to the high pressure side of the hydrostatic drive so that the cylinder exerts a belt tensioning force that is proportional to the pressure in the high pressure side of the hydrostatic drive, whereby an increase in pressure in the hydrostatic drive as a result of increased torque required to propel the combine increases the belt tension in the belt drive.

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