Flow distribution sliding disc pair and plunger pump or motor comprising structure

Abstract

The invention discloses a flow distribution sliding disc pair and a plunger pump or motor comprising the structure. The flow distribution sliding disc pair comprises swash discs and sliding discs supported on the swash discs, each sliding disc is of an integrated structure, the opposite end faces of the sliding discs and the swash discs are provided with static pressure bearing surfaces, the static pressure bearing surfaces are provided with a plurality of oil chambers, the end surfaces the other sides of the sliding discs are provided with a plurality of plunger ball sockets, and the slidingdiscs are provided with large-aperture oil passing holes for communicating the plunger ball sockets and the oil chambers; and the swash discs are provided with flow distribution oil grooves communicating with inlet and outlet ports, and the flow distribution oil grooves communicate with the inlet and outlet ports in the positions, close to the ends of one sides of the swash discs, on a shell of the plunger pump or motor. By means of the flow distribution sliding disc pair and the plunger pump or motor, flow distribution, variable inclination and the supporting function are integrated into theflow distribution sliding disc pair, the number of friction pairs is decreased, the influence of cylinder block overturning and oil pollution is reduced, the structure is greatly simplified, the workreliability and work pressure of the plunger pump or motor are improved, and the working life of the plunger pump or motor is prolonged.

Description

technical field [0001] The invention belongs to the technical field of hydraulic transmission and control, and in particular relates to a flow distribution slide plate pair and a plunger pump or motor including the structure. Background technique [0002] Axial piston pumps and motors are one of the most widely used hydraulic components in modern hydraulic transmission, among which hingeless inclined axis pumps and sliding shoe swash plate axial piston pumps are currently the most widely used and most important two. Axial piston pumps. Inclined shaft pumps and sliding shoe swash plate types have their own characteristics. At present, these two pumps or motors are still competing, and each is constantly improving and developing. [0003] like figure 1 As shown, it is a typical structure of a current inclined-axis pump or motor, including a drive shaft 10, a drive plate 13, a bearing 21, a housing, a pressure plate 60, a plunger 70, a cylinder 80, a central shaft 140, and a ...

AI Technical Summary

Problems solved by technology

But the inclined axis pump or motor also has its disadvantages: 1. It is difficult to change the variable. Because the swing cylinder or shell is used to realize the variable, the moment of inertia is large, so the variable is more difficult and the response time of the variable is slow; 2. The service life is relatively long. Short, mainly due to the influence of the service life of the drive spindle support bearing, generally 2000-5000 hours, much shorter than the life of the sliding shoe swash plate axial piston pump or motor (generally 5000-10000 hours)

Compared with the inclined shaft pump, the swash plate plunger pump has a simpler and more compact structure, smaller volume and lighter weight. The stepless variable is realized through the swing of the swash plate. The variable is more convenient, there are more variable forms, and the variable inertia is small. The variable response speed is relatively fast, and the through-shaft swash-plate pump can also be connected with a charge pump at the shaft end to form a series pump or motor; but the swash-plate plunger pump also has its disadvantages: 1. The motor has one more main friction pair, which leads to increased leakage of the swash plate plunger pump and reduces its volumetric efficiency. At the same time, the increase in the number of friction pairs also increases the failure probability of the pump or motor; 2. Under the action of hydraulic pressure, The lateral force of the plunger in the swash plate plunger pump is much higher than that of the inclined axis plunger pump. The lateral force is transmitted to the cylinder block and the main shaft through the plunger, resulting in a wedge-shaped gap between the cylinder block and the valve plate. Increased volume loss of the pump and partial contact of the sealing surface between the cylinder block and the valve plate, resulting in surface burns between the cylinder block and the valve plate, resulting in complete loss of function of the pump

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