The hydraulic pump is composed of 2 pumps. The 2 pumps installed on the same shaft are combined with a first gear, and the rotary force is distributed to each shaft through the gear mechanism, and the rotary force of the prime mover is transmitted to the front drive shaft. In order to drive two pumps, it can also drive auxiliary pumps installed on different shafts at the same time.Hydraulic pumps can be roughly divided into: rotary components used to control rotary motion, oblique components used to control hydraulic oil discharge, The valve body assembly used to switch the suction and discharge of hydraulic oil and the PTO assembly used to transmit the drive shaft of the gear pump.
Rotary assembly is composed of drive shaft F, cylinder block, piston slide swash plate, spherical bushing and cylinder spring. Both ends of the drive shaft are supported by bearings. The slider is clamped by the piston to form a spherical joint, and at the same time can reduce the thrust generated by the load pressure, and the slider has a concave portion, which can achieve hydraulic balance, so that the slider plate gently slides upward, the piston slide sub-assembly The pressure plate and the spherical bushing are clamped by the sliding plate under the action of the cylinder spring, so that the sliding plate can slide smoothly. The cylinder block is also clamped by the valve plate under the action of the cylinder spring.
The inclined plate assembly is composed of inclined plate, sliding plate, inclined plate support table, inclined bush, inclined pin and servo piston. The swash plate is supported by a swash plate support table of a cylindrical portion formed in the opposite direction of the sliding surface of the slider. The pressure regulating valve controls the hydraulic pressure to be guided to the hydraulic chambers on both sides of the servo piston. The servo piston moves left and right. The swash plate slides on the slant plate support table through the ball portion of the tilt pin, thereby changing the tilt angle (a).
Valve block assembly consists of valve block, valve plate and valve plate pin. The valve plate is installed on the valve block and has two claw-shaped oil ports, which serve to supply and recover hydraulic oil to the cylinder. The hydraulic oil switched by the valve plate is connected to the external piping through the valve block.
In this way, after the drive shaft is driven by the prime mover (motor, engine, etc.) and connected by splines, the cylinder also rotates the swash plate at the same time, the piston and cylinder arranged in the cylinder rotate at the same time, and reciprocate relative to the cylinder. Therefore, observing the movement of a piston can see that during the operation of the cylinder once, the piston moves 180° away from the valve plate (stroke of suction hydraulic oil), and the remaining 180° stroke moves toward the valve plate (spit out hydraulic pressure) The stroke of the oil), when the inclined angle of the swash plate is 0°, the piston moves without stroke, and the structure of the hydraulic pump that does not discharge hydraulic oil is shown in Figure 3-36.
