Variable ratio fluid-mechanical drive apparatus

Machine element or mechanism – Elements – Gear casings

Patent

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Details

74677, 74681, F16H 4704

Patent

active

043734081

ABSTRACT:
A variable ratio fluid-mechanical variable ratio drive apparatus (10) is described utilizing an axial piston, variable positive displacement pump (22), an axial piston, variable positive displacement motor (24); and an intermediate planetary gear set (16). The apparatus has an input drive shaft (35) connected to planetary gear carrier (20) for driving the planetary gear set. The pump (22) has a shaft (54) mounted coaxial to the input drive shaft (35) and is connected to a sun gear (21) to control the rotational speed of the sun gear (21). The apparatus has an output shaft (143) operatively connectable to a planetary ring gear member (18). The motor (24) is mounted coaxial and operatively connected to the output shaft for transferring torque therebetween. The pump (22) and the motor (24) are hydraulically interconnected to transfer fluid therebetween. A clutch means (28) is provided operatively intermediate the planetary gear set and the output shaft to mechanically interconnect and disconnect the output shaft (143) from the ring gear member (18). Both the pump (22) and the motor (24) have opposed piston cavity barrels (76, 77) mounted about the input and output shafts (35, 143) respectively. A plurality of angularly spaced double ended piston rods (64) having pistons (72, 73) on the ends thereof project into cavities (79) formed in the barrels (76, 77). The piston rods (64) and pistons (72, 73) are held axially stationary. The barrels (76, 77) are supported for rotation about the shaft axis and are supported for pivotal movement about tilt axes by barrel carriers (92, 93, 184, 185) to vary the angular orientation of the barrels to vary the fluid displacement of the pump 22 and/or the motor 24.

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