Axial plunger pump swash plate-sliding shoe assembly with controllable electromagnetic composite support

Abstract

The invention discloses an axial plunger pump swash plate-sliding shoe assembly with a controllable electromagnetic composite support. An electromagnetic ring with controllable magnetic force is used for adjusting the thickness of a clearance oil film of a sliding shoe friction pair. A plurality of annular deep grooves are machined in the surface of a swash plate, and small cylindrical electromagnets wound with coils and annular electromagnets are embedded into the annular deep grooves; and annular grooves are also machined in the bottom surface of a sliding shoe to embed annular permanent magnets, the magnetism of the surface of the swash plate and the magnetism of the bottom surface of the sliding shoe are the same, and mutual repulsive force is generated, so that the thickness of the clearance oil film of the sliding shoe friction pair is adjusted by changing the magnitude of current in the coils of the annular electromagnets in the swash plate. The thickness of an oil film at the sliding shoe friction pair in a high-pressure oil acting area of the swash plate is small, abrasion is prone to occurring, by increasing the magnetic repulsive force, the lubricating property of the oil film can be improved to a certain extent, the supporting force of the oil film on the surface of the sliding shoe friction pair is increased, friction between the sliding shoe and the swash plate is reduced, and the dynamic stability performance of the swash plate-sliding shoe assembly is improved.

Description

technical field [0001] The invention relates to the field of axial piston pumps, in particular to a swash plate-slider assembly of an axial piston pump with controllable electromagnetic composite support. Background technique [0002] Axial piston pumps are widely used in hydraulic systems in different fields such as construction machinery, construction machinery, and aerospace equipment due to their compact structure, large power-to-weight ratio, and various variable modes. Axial piston pump is a volumetric fluid machine that utilizes volume change to establish pressure and deliver flow. There are multiple friction pairs during its operation, among which the friction pair of sliding shoes plays an indispensable role. The sliding shoe friction pair is a plane pair composed of a sliding shoe and a swash plate, and it is a key friction pair participating in the oil suction and discharge process of the axial piston pump. During the oil suction and discharge process, the slidin...

AI Technical Summary

Problems solved by technology

However, the friction pair of the sliding shoe is also a source of energy dissipation. On the one hand, when the oil film in the gap between the friction pair of the sliding shoe is too large, the leakage loss is relatively large. Usually, the leakage loss increases with the increase of the working pressure and speed of the plunger pump. On the other hand, when the bearing capacity of the oil film is not enough to resist the external load force, the friction pair of the sliding shoe is in extreme conditions such as boundary lubrication or even dry friction, which significantly increases the loss of friction torque; the energy consumption generated by the two is converted into heat, reducing Oil viscosity weakens the bearing capacity of the oil film, until failures such as wear of the bearing interface and friction pair of sliding shoes occur, which seriously affect the mechanical efficiency and volumetric efficiency of the whole pump, and even lead to failure of the axial piston pump

Images