Created on:2021-05-10 11:00

Typical structure of piston rack and pinion swing hydraulic motor

Typical structure of piston rack and pinion swing hydraulic motor

① Single cylinder single acting swing motor (Figure z) in the single cylinder single acting swing motor, the rack 5 and gear 6 used as the piston rod mesh together to form a mechanical converter. When the pressure oil is input, the piston 4 pushes the rack to move in a straight line, which is converted into rotary motion by the gear, and the torque is output by the gear shaft. The control of the piston stroke, that is, the output angle, can be adjusted by screw 1. The advantages of this kind of swing motor are simple structure, easy to control position accuracy and wide application.

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② The single cylinder double acting swing motor (Fig. a) has two pistons 3 with rack arranged opposite each other in a cylinder block 2. The pressure oil acts on the piston to make it move back and forth, and drives the load on the output shaft to swing through the gear 4. The output torque of the motor is large, but the stroke is short and the angle is small.

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③ The double cylinder double acting swing motor (Fig. b) has a piston 2 with rack arranged in the upper and lower directions of the cylinder block 4. The pressure oil acts on the piston to make it move back and forth, and drives the load on the output shaft to swing through the gear 5. Under the same conditions, the output torque of the double cylinder double acting swing motor is twice that of the single cylinder single acting swing motor. At present, the swing angle of this product can reach 360. The output torque can reach more than 100000 nm.

④ This motor is composed of piston 3, crank 7, connecting rod 4 and output shaft 6. During operation, the pressure oil from the left and right oil ports 1 and 2 drives the piston 3 to move back and forth, and the crank 7 is driven to swing through the connecting rod 4. The shaft 6 with flat key on the crank is the shaft with output torque. The motor swing angle is controlled by adjusting screw 5.

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