Side plate for hydraulic motor

Abstract

The invention relates to a side plate for a hydraulic motor, which comprises a base material layer and a contact layer sintered on the base material layer. And the contact layer is formed by sintering and rolling alloy powder of copper, tin, lead, nickel, zinc and iron on the base material layer at a certain temperature. The mass percent of the tin is 15%-23%, the mass percent of the lead is 12%-20%, the total mass percent of the nickel, the zinc and the iron is less than 0.5%, and the balance is the copper. In the contact layer, the number of lead particles in 1 square millimeter of the contact layer 20 is 600-1100, and the mesh number of the lead particles is 600-800. According to the side plate, the contact layer is formed by selecting the composition and content of the side plate and sintering and rolling, and the porosity of the contact layer is 3-15%, so that the pores of the contact layer can be filled with lubricating oil, and the lubricating performance can be improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of manufacturing of hydraulic motor, in particular to a side plate for hydraulic motor. BACKGROUND

[0002] Hydraulic motor is an executing element of hydraulic system, which converts the liquid pressure energy provided by hydraulic pump into mechanical energy (torque and rotation speed) of its output shaft. Hydraulic motor can be classified into gear type, vane type, plunger type and other types according to its structure type. Plunger type hydraulic motor rotates around the main shaft by inputting high pressure oil, and the high pressure oil pushes the plunger to move linearly from high to low of the swash plate, and the plunger on the other side pushes the oil out of the swash plate with a certain angle, forming a kind of rotary motion, so as to rotate the motor output shaft.

[0003] A side plate is arranged on the end face of the output shaft of the hydraulic motor, and the side plate is fixed on the main body of the hydraulic motor. When the hydraulic motor is connected with the driven device, one side of the driven device abuts against the side plate. When the output shaft of the hydraulic motor rotates, the driven device is driven to rotate, and at this time, the driven device and the side plate will relatively rub, so that the wear resistance and lubrication performance of the side plate will affect the service life and quality of the hydraulic motor. If the side plate is not wear-resistant, a gap will be formed soon, which will affect the output accuracy. If the lubrication performance of the side plate is poor, a lot of heat will be generated, and the output power will be affected, and further the wear resistance will be affected. SUMMARY

[0004] Therefore, the present application provides a side plate for hydraulic motor to improve the wear resistance and lubrication performance.

[0005] A side plate for hydraulic motor includes a base material layer and a contact layer sintered on the base material layer. The contact layer is formed by sintering and rolling the alloy powder of copper, tin, lead, nickel, zinc and iron on the base material layer at a certain temperature. The mass percentage of tin is 15% to 23%, the mass percentage of lead is 12% to 20%, the total mass percentage of nickel, zinc and iron is less than 0.5%, and the rest is copper. In the contact layer, the number of lead particles in 1 square millimeter of the contact layer is 600 to 1100, and the mesh number of the lead particles is 600 to 800.

[0006] Further, the percentage content of tin is 16%, the percentage content of lead is 12%, the percentage content of nickel is 0.1%, the percentage content of zinc is 0.1%, the percentage content of iron is 0.02%, and the rest is copper.

[0007] Further, the percentage content of tin is 20%, the percentage content of lead is 14%, the percentage content of nickel is 0.1%, the percentage content of zinc is 0.2%, the percentage content of iron is 0.04%, and the rest is copper.

[0008] Further, the percentage content of tin is 22%, the percentage content of lead is 17%, the percentage content of nickel is 0.2%, the percentage content of zinc is 0.2%, the percentage content of iron is 0.07%, and the rest is copper.

[0009] Further, the contact layer has a porosity of 3% to 15%.

[0010] Further, the surface hardness of the contact layer is above HB100.

[0011] Compared with the prior art, the side plate for hydraulic motor provided by the present application can fill lubricating oil in the pores of the contact layer by selecting the composition and content of the side plate and forming the contact layer by sintering and rolling, so as to improve the lubricating performance. Meanwhile, the content, particle number and mesh number of lead in the composition of the side plate are strictly limited to balance the lubricating performance and mechanical strength and surface hardness. Specifically, the particle number of lead in 1 square millimeter of the contact layer is 600 to 1100, and the mesh number of the lead particles is 600 to 800. It is verified by experiments that the lubricating performance and surface hardness of the contact layer are much better than those of the copper plate commonly used in the prior art, which is beneficial to provide the wear resistance and lubricating performance of the side plate, so as to improve the service life and quality of the hydraulic motor. BRIEF DESCRIPTION OF DRAWINGS

[0012] Figure 1 The side plate for hydraulic motor provided by the present application is shown in the structure diagram. DETAILED DESCRIPTION

[0013] The specific embodiments of the present application are further described in detail below. It should be understood that the description of the embodiments of the present application herein is not used to limit the protection scope of the present application.

[0014] As Figure 1As shown, it is a structure schematic diagram of a side plate for hydraulic motor provided by the present application. The side plate for hydraulic motor is composed of a base material layer 10 and a contact layer 20. The base material layer 10 can be made of steel, copper and copper alloy. The contact layer 20 is formed by sintering and rolling the alloy powder of copper, tin, lead, nickel, zinc and iron on the base material layer 10 at a certain temperature. The mass percentage of tin is 15% to 23%, the mass percentage of lead is 12% to 20%, the total content of nickel, zinc and iron is less than 0.5%, and the rest is copper. The particle number of lead should be strictly limited to ensure the surface hardness of the contact layer 20. Specifically, in the contact layer 20, the particle number of lead in 1 square millimeter of the contact layer 20 is 600 to 1100, and the mesh number of the lead particles is 600 to 800, so that the surface hardness can reach more than HB100.

[0015] After mixing the copper, tin, lead, nickel, zinc and iron according to the predetermined content, the mixture is sintered on the base material layer 10. The contact layer 20 formed by sintering is rolled to limit the porosity to 3% to 15%, so that the lubricating oil can be filled in the pores, thereby improving the lubricating performance.

[0016] In the present application, the lead plays a very important role because it can not only improve the lubricating performance of the side plate, but also affect the mechanical strength of the side plate. Too much content or too large mesh number of lead will reduce the surface hardness of the side plate, so that the surface hardness of the contact layer 20 cannot reach more than HB100. Therefore, the particle number of lead in 1 square millimeter and the size of the lead particles need to be controlled, and the above-mentioned mesh number helps to balance the lubricating performance and the mechanical strength of the side plate. Preferably, the mesh number of the lead particles is 650.

[0017] In the material for preparing the contact layer 20 and in the sintering process, the tin element can form a solid solution in the copper matrix, strengthening the matrix structure, and the presence of tin can improve the wear resistance of the contact layer 20. In the sintering process, the zinc can form α solid solution with copper, i.e. brass, thereby improving the strength. The iron as a heterogeneous nucleating agent can refine the grain, thereby forming a Cu-Fe crystal alloy, and further improving the strength and wear resistance.

[0018] Example 1

[0019] In the material for preparing the contact layer 20, the percentage content of tin is 16%, the percentage content of lead is 12%, the percentage content of nickel is 0.1%, the percentage content of zinc is 0.1%, the percentage content of iron is 0.02%, and the rest is copper.

[0020] Example 2

[0021] In the material for preparing the contact layer 20, the percentage content of tin is 20%, the percentage content of lead is 14%, the percentage content of nickel is 0.1%, the percentage content of zinc is 0.2%, the percentage content of iron is 0.04%, and the rest is copper.

[0022] Example 3

[0023] In the material for preparing the contact layer 20, the percentage content of tin is 22%, the percentage content of lead is 17%, the percentage content of nickel is 0.2%, the percentage content of zinc is 0.2%, the percentage content of iron is 0.07%, and the rest is copper.

[0024] Comparative Example

[0025] The comparative example uses a common copper plate.

[0026] For the above-mentioned examples, the material hardness, friction factor and wear amount are tested by an experimental machine, and the test results are as follows.

[0027] Table 1 Performance comparison table of Example 1 and Comparative Example

[0028]

[0029] Table 2 Performance comparison table of Example 2 and Comparative Example

[0030]

[0031] Table 3 Performance comparison table of Example 3 and Comparative Example

[0032]

[0033] Through the above tests, it can be concluded that the material of the contact layer 20 of the present application has a certain improvement in hardness and a decrease in average friction factor compared with the existing copper plate, and although the wear amount of Example 1 and Example 3 does not decrease, the wear amount of Example 2 decreases compared with the copper plate. At the same time, it can also be seen that with the increase of the content of lead, the surface hardness is slightly reduced, but the friction factor is reduced.

[0034] Compared with the prior art, the side plate for hydraulic motor provided by the application fills lubricating oil in the pores of the contact layer 20 by selecting the composition and content of the side plate and forming the contact layer 20 by sintering and rolling, so that the lubricating performance is improved. Meanwhile, the content, particle number and mesh number of the lead in the composition of the side plate are strictly limited to balance the lubricating performance and the mechanical strength and surface hardness. Specifically, the particle number of the lead in the contact layer 20 of 1 square millimeter is 600-1100, and the mesh number of the lead particles is 600-800 meshes. It is verified by experiments that the lubricating performance and surface hardness of the contact layer are much better than those of the copper plate commonly used in the prior art, which is beneficial to provide the wear resistance and lubricating performance of the side plate, so that the service life and quality of the hydraulic motor are improved.

[0035] The above merely describes the preferred embodiments of the application, and is not used to limit the protection scope of the application. Any modification, equivalent replacement or improvement within the spirit of the application is included in the protection scope of the claims of the application.

Claims

1. A side plate for a hydraulic motor, characterized by: The side plate for hydraulic motor comprises a base material layer and a contact layer sintered on the base material layer, the contact layer is formed by sintering and rolling the alloy powder of copper, tin, lead, nickel, zinc and iron on the base material layer, the mass percentage of tin is 15-23%, the mass percentage of lead is 12-20%, the total mass percentage of nickel, zinc and iron is less than 0.5%, the rest is copper, the number of lead particles in 1 square millimeter of the contact layer is 600-1100, and the mesh number of the lead particles is 600-800.

2. The side plate for a hydraulic motor according to claim 1, characterized by: The percentage content of tin is 16%, the percentage content of lead is 12%, the percentage content of nickel is 0.1%, the percentage content of zinc is 0.1%, the percentage content of iron is 0.02%, and the rest is copper.

3. The side plate for a hydraulic motor according to claim 1, characterized by: The percentage content of tin is 20%, the percentage content of lead is 14%, the percentage content of nickel is 0.1%, the percentage content of zinc is 0.2%, the percentage content of iron is 0.04%, and the rest is copper.

4. The side plate for a hydraulic motor according to claim 1, characterized by: The percentage content of tin is 22%, the percentage content of lead is 17%, the percentage content of nickel is 0.2%, the percentage content of zinc is 0.2%, the percentage content of iron is 0.07%, and the rest is copper.

5. The side plate for a hydraulic motor according to claim 1, characterized by: The contact layer has porosity of 3-15%.

6. The side plate for a hydraulic motor according to claim 1, characterized by: The surface hardness of the contact layer reaches HB100 or above.

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