Plunger type Oil motor Because of a series of advantages such as low noise, high efficiency, long life, high output power and variable flow, it is widely used by the public, and is used in various industries, such as agricultural and animal husbandry sowing vehicles, drilling machines, stackers, vibratory rollers, compactors and other engineering machinery and equipment. To better understand the plunger type oil motor, we must start from the operating principle and internal structural characteristics of the plunger type oil motor:
Operating principle of plunger type oil motor:
The plunger type high-speed motor is usually of the shaft diameter type, and Figure C shows its operating principle. Swashplate 1 and oil distribution plate 4 are fixed, and cylinder block 3 and plunger 2 can rotate around the horizontal axis of the cylinder block. When the pressure oil enters the cylinder hole through the oil distribution plate to the bottom of the plunger, the plunger is forced out by the effect of oil pressure and firmly pressed on the swashplate surface. At this time, the counterforce of the swashplate on the plunger is F. There is a tilt angle based on the swashplate γ， Therefore, F degradability is 2 forces; One is the shaft diameter force Fx, which is horizontal to the plunger axis and balanced with the oil pressure at the bottom of the plunger; The other force is Fy, perpendicular to the plunger axis. The measured values of the two are
Fx=pd2
Fy=Fxtan γ y=pd2tan γ
The acting force Fy forms a torque on the cylinder block axis to drive the cylinder block to rotate. The cylinder block then outputs torque and speed outward according to the main shaft (not indicated in the figure) and becomes an oil motor. It can be seen from the figure that the instantaneous torque T ′ formed by Fy on each plunger in the oil pressure area (half cycle) to the cylinder block is
T′=Fyh=FyRsina(a)
Where, h is the vertical distance between Fy and the cylinder block axis line; R is the circular radius of the plunger on the cylinder block; A is the instantaneous azimuth angle of the plunger in the oil pressure area to the cylinder block axis line.
The output torque of the oil motor is equal to the sum of the instantaneous torque T 'of each plunger in the oil pressure area (half cycle). Based on the fact that the instantaneous azimuth of the plunger is a variable, T 'also changes periodically in sine, so the torque output by the oil motor is also pulsating.
If the input direction of oil motor pressure oil is changed, the rotation direction of oil motor output shaft is opposite to the original direction; Changing the Inclination of Swashplate γ The size and orientation of can change the displacement, output torque and deflection of the oil motor.
Structural features of plunger type oil motor:
Diagram D shows the structure of ZM axial diameter plunger oil motor. Swashplate 2 (consisting of thrust rolling bearings) and oil distribution plate 7 are fixed. Part of the rotating cylinder block is divided into cylinder block 6 and drum 3, which are installed on the output shaft 'king'. The drum is connected to the output shaft with a key for power transmission. The hydraulic pressure makes the push rod 9 act on the swashplate according to the plunger 8. The recoil force of the swashplate makes the push rod and the drum form a rotary movement, pushing the output shaft to rotate.
The drum drives the cylinder block to rotate together with the help of the pin 5. In this way, the overturning torque borne by the push rod and the drum is not easy to be transmitted to the surface of the oil distribution plate, and the same plunger and cylinder block only bear the axial force, thus reducing the uneven wear between the relative speed parts and enhancing the sealing characteristics of the surface of the oil distribution plate. The total length of contact between the cylinder block and the output shaft is very short, so that the cylinder block has a corresponding self positioning effect, which can better ensure the full contact between the surface of the oil distribution plate and the milling surface of the cylinder block. In addition, the cylinder block