Created on:2021-03-30 14:11

Working principle of multi action radial piston motor

Working principle of multi action radial piston motor

As shown in figure s, in the multi action radial piston motor, the cam ring 1, as a guide rail, is composed of exactly the same X-section curve (x = 6 in the figure), and each section curve is composed of symmetrical oil inlet and oil return sections. There are Z evenly distributed piston cylinder holes in the cylinder block, and the bottom of which is communicated with the port window hole of port shaft 4. There are 2x port windows in the oil distribution shaft, which are connected with the high-pressure oil, corresponding to the oil inlet section of the leading curve, and the other X windows are connected with the oil return section of the curve. When working, under the action of pressure oil, the roller 5 presses against the guide rail, the force n is the reaction force of the guide rail curved surface against the roller, the radial component f is balanced with the hydraulic pressure, and the tangential component f 'is transmitted to the cylinder block 2 through the beam 3, forming the torque driving the external load. The motor reverses when the inlet and outlet oil circuits of the motor change direction. As shown in figure s, the tangential component f 'of roller reaction force n is transmitted to the cylinder body through the cross beam, which is called the cross beam force transfer motor; if the tangential component is transmitted to the cylinder body through the plunger, it is called the plunger force transfer motor; if the tangential component is transmitted to the cylinder body through the other two rollers on the same cross beam through the guide side plate, it is called the roller force transfer motor; if the steel ball in the plunger ball socket interacts with the guide rail With force transmission, it is called ball plug type inner curve motor.

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The working principle of multi action hydraulic motor should pay attention to the following points.

① Variable problem multi action hydraulic motor can be controlled by changing any one of action number x, row number y and plunger number Z when plunger diameter D and plunger stroke h are fixed.

② The output torque and speed of the hydraulic motor are pulsating, and the pulsation depends on the motion law of the plunger pair, while the motion law of the plunger pair completely depends on the rail curve. The kinematic variation law of the guide curve determines the motion characteristics (displacement, velocity, acceleration) of the plunger pair and the interaction force with the guide surface, thus affecting the uniformity of the torque and speed of the motor, affecting the size of the contact stress between the guide surface and the plunger pair, thus largely determining the service life of the motor. At present, the most commonly used rail curves in multi action hydraulic motor are equal acceleration curve, angle correction equal acceleration curve, trapezoidal acceleration curve and equal contact stress curve. These rail curves can make the motor output without pulsation.

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