Spherical hydrostatic bearing sliding plate pair structure and swash plate type plunger pump or motor comprising same

Abstract

The invention discloses a spherical hydrostatic bearing sliding plate pair structure and a swash plate type plunger pump or motor comprising the same. The sliding plate pair structure comprises a swash plate and a sliding plate; the sliding plate adopts the integral structure; multiple plunger ball sockets are formed in the end surface of the sliding plate; a hydrostatic bearing spherical surfaceis arranged on the end surface of the sliding plate; the swash plate has a spherical bearing surface with the curvature radius identical with that of the hydrostatic bearing spherical surface; oil passing holes are formed in the sliding plate; and oil is guided into the space between the hydrostatic bearing spherical surface and the spherical bearing surface through the oil passing holes, so thata hydrostatic oil film bearing in clearance fit is formed by the sliding plate and the swash plate. According to the structure and the swash plate type plunger pump or motor, on the one hand, multipledispersed sliding shoe structures are cancelled, eccentric wear and return stroke plate breakage caused by centrifugation of sliding shoes can be prevented, on the other hand, the spherical sliding plate pair structure and the conical plunger structure are adopted, the lateral component force acting upon a plunger under the action is substantially reduced, and the excessively-large wedge clearance is avoided between a cylinder block and a valve plate, so that the working reliability and the working life of the swash plate type plunger pump or motor are increased by the aid of the structure.

Description

technical field [0001] The invention belongs to the technical field of hydraulic transmission and control, and in particular relates to a spherical static pressure supporting sliding plate pair structure and a swash plate type 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. 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, so the swash plate plunger pump ha...

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Problems solved by technology

[0007] 2. During high-speed motion, the sliding shoe is subjected to the comprehensive action of the centrifugal moment caused by the circumferential movement and the frictional moment generated by the rotation of the cylinder, which will cause the sliding shoe to overturn relative to the surface of the swash plate, thereby forming a wedge-shaped oil film and causing the sliding The boot wears sideways, which destroys the normal work of the slide boot

[0008] 3. With the increase of pressure and speed, when the lubricity of the oil and the wear resistance of the friction pair material are not good enough, due to the existence of residual pressing force, there will be more serious wear between the sliding shoe and the swash plate friction pair, There is even a phenomenon of "burning boots"

[0009] 4. Each sliding shoe and return plate are independent components, and they are also high-precision processing components. Therefore, the processing volume is large and the processing requirements are high

[0010] 5. Since the sliding shoe and the return plate are relatively independent components with a certain gap, there are friction, pushing, impact and other phenomena between the two, and it is easy to make a large mechanical noise

[0011] 6. The supporting force provided by the swash plate will generate a lateral component force, which acts on the cylinder body through the plunger, causing the cylinder body to incline relative to the end face of the valve plate. When the inclination is large, the cylinder body and the The seal of the sliding plate is damaged, resulting in excessive leakage, which makes the oil film support of the cylinder block and the valve plate invalid

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