Novel outer row compressed type multi-row axial plunger pump/motor

Abstract

The invention provides a novel outer row compressed type multi-row axial plunger pump / motor, and relates to the field of axial plunger pump / motors of hydraulic machinery. The novel outer row compressed type multi-row axial plunger pump / motor comprises a shell, a cylinder body, a transmission shaft, a thrust plate, an inner swash plate and an outer swash plate; a front gland is connected with a front end cover through hexagonal screws; the front end cover is connected with the shell through hexagonal screws; the shell is connected with a rear pump cover through screws; the transmission shaft drives the cylinder body to rotate through splines, a baffle groove of the cylinder body is internally provided with a baffle, and the outer side of the cylinder body is sleeved with an outer compressedball sleeve; the outer ball surface of the outer compressed ball sleeve is hinged to the inner ball surface of an outer compressed plate, and outer row spring seats and outer row springs are installed in spring holes of the outer compressed ball sleeve; the side, close to the front end cover, of the transmission shaft is provided with the inner swash plate and the outer swash plate; and the innerswash plate and the outer swash plate are connected through swash plate positioning pins. According to the novel outer row compressed type multi-row axial plunger pump / motor, rotating bodies are of afull symmetrical structure, spring force is distributed uniformly, action baffles of the outer row springs are inserted in the cylinder body, cylinder body prepared materials are reduced, the cost isreduced, and the structure is simple and practical.

Description

technical field [0001] The invention relates to the technical field of axial plunger pumps / motors in hydraulic machinery, in particular to a novel multi-row axial plunger pump / motor for external compaction. Background technique [0002] Axial piston pumps / motors are all important components in the hydraulic field. Axial piston pumps / motors are basically reversible in principle, and there are only differences in some structures. Therefore, only the externally compressed ones are discussed in this specification. The design of the motor structure is similar to the multi-row axial piston pump. [0003] Axial piston pump is a highly integrated variable displacement pump with small size, high efficiency, small leakage, high speed and high pressure and impact resistance. It is widely used in construction machinery, coal mining machinery, agricultural machinery and aerospace and other occasions, especially in various In a high-pressure and high-power hydraulic system. [0004] Whe...

AI Technical Summary

Problems solved by technology

There are mainly two types of existing pressing methods. One is to provide pre-tightening force to the ball joint through the central spring, and the ball joint presses the inner return plate, thereby pressing the inner row of sliding shoes, and with the multi-row axial plunger With the rise of pumps / motors, this pressing method is not enough to provide enough pressing force for the outer row of slide shoes, and because the design of the return plate is relatively complicated, it is easy to interfere with other parts

The second is to install a compression spring at the bottom of the plunger hole of the cylinder to provide a compressive force to the plunger to compress the sliding shoe. Since the plunger has a high-frequency reciprocating motion, the spring stretches back and forth, which may easily cause fatigue failure of the spring, and The swash plate of the multi-row axial piston pump has multiple slopes, and the scheme of installing compression springs at the bottom of the plunger holes is not conducive to the increase of the pump speed

[0006] 1. The pressing mechanism of the swash plate type axial piston pump / motor directly presses the return plate through the pressure ring. The structure of the return plate is asymmetrical, which is difficult to manufacture and the distribution of the pressing force is not uniform enough.

[0007] 2. In the pressure ring of the swash plate axial piston pump / motor compression device, the spring directly acts on the pressure ring. The actual contact between the spring and the pressure ring is a line contact, and the output of the spring force is relatively concentrated, which may easily cause the pressure ring to be stressed. unstable, vibrating

[0008] 3. The outer ring of the cylinder of the full external compression axial piston pump or motor is provided with a boss, and the compression of the cylindrical coil spring is applied to the boss to compress the flow distribution pair, adding an axial piston pump / motor The radial size is not conducive to the compactness of the structure

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