Self-lubricating knuckle bearing

Abstract

The utility model relates to a self-lubricating knuckle bearing, which comprises a bearing outer ring, a bearing inner ring and a self-lubricating polymer arranged between the bearing outer ring and the bearing inner ring, the bearing inner ring is sleeved inside the bearing outer ring, the self-lubricating polymer is bonded on the inner surface of the bearing outer ring, an anode oxide layer is arranged on the outer surface of the bearing inner ring, and the anode oxide layer is coated on the outer surface of the bearing inner ring. The anodic oxide layer is of a uniform porous structure, and the anodic oxide layer and the self-lubricating polymer form a friction pair with self-lubricating performance. And meanwhile, the uniform porous structure formed by anodic oxidation on the outer surface of the bearing inner ring has a micro-cutting effect on the self-lubricating polymer, so that mechanical interlocking is favorably formed between cut polymer chips and the uniform porous structure, the frictional wear performance of the knuckle bearing is improved, and the service life of the knuckle bearing is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of spherical bearings, in particular to a self-lubricating spherical bearing. Background Art

[0002] Self-lubricating spherical plain bearings have a simpler structure than rolling bearings. They are mainly composed of a bearing outer ring, a bearing inner ring and a self-lubricating pad bonded to the inner surface of the bearing outer ring. They can rotate and swing at any angle during movement. They have the characteristics of self-lubrication, high impact resistance, self-aligning, and no need for frequent maintenance. They are widely used in aerospace, nuclear energy industry, precision instruments, light industry and other fields.

[0003] With the development of modern aviation technology, various friction parts are required to be more and more demanding in the fields of military, aerospace, etc. In order to meet the performance requirements of long-term reliable operation under aviation conditions, higher requirements are also placed on the performance of self-lubricating spherical plain bearings. Currently, the self-lubricating spherical plain bearings on the market have problems such as insufficient friction and wear performance and poor self-lubricating effect, which shortens their service life.

[0004] The prior art discloses an aluminum alloy spherical bearing and a self-lubricating spherical bearing, wherein the aluminum alloy spherical bearing comprises a bearing outer ring and a bearing inner ring, wherein the bearing inner ring is sleeved inside the bearing outer ring; the bearing outer ring comprises a bearing outer ring substrate, wherein the surface of the bearing outer ring substrate has an anodic oxidation layer after an anodic oxidation treatment; the bearing inner ring comprises a bearing inner ring substrate, wherein the surface of the bearing inner ring substrate has a micro-arc oxidation layer after a micro-arc oxidation treatment.

[0005] It has the following technical problems:

[0006] The inner ring substrate surface of the bearing with micro-arc oxidation layer has defects such as crater-shaped micropores, cracks, overgrowth areas and rough surfaces, which increase the wear of the self-lubricating liner and further affect the service life. Utility Model Content

[0007] In view of the problems existing in the prior art, the purpose of the utility model is to provide a self-lubricating spherical bearing, improve the friction conditions, enhance the friction and wear performance of the bearing, and extend the service life of the self-lubricating joint load-bearing.

[0008] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0009] A self-lubricating spherical bearing comprises a bearing outer ring and a bearing inner ring, wherein the bearing inner ring is sleeved inside the bearing outer ring, a self-lubricating polymer is arranged between the bearing outer ring and the bearing inner ring, the self-lubricating polymer is bonded to the inner surface of the bearing outer ring, an anodic oxide layer with a uniform porous structure is arranged on the outer surface of the bearing inner ring, and the anodic oxide layer and the self-lubricating polymer form a friction pair with self-lubricating performance;

[0010] The uniform porous structure has a micro-cutting effect on the self-lubricating polymer, so that the cut polymer chips form a mechanical interlocking with the porous structure.

[0011] Furthermore, the inner surface of the bearing outer ring and the outer surface of the bearing inner ring are both spherical structures.

[0012] Furthermore, the bearing inner ring comprises a bearing inner ring substrate, and the anodized layer is arranged on the outer surface of the bearing inner ring substrate.

[0013] Furthermore, the pore diameter of the uniform porous structure is 100 nm.

[0014] Furthermore, the hardness of the anodized layer is ≥300 HV.

[0015] Furthermore, the self-lubricating polymer is a polytetrafluoroethylene composite material.

[0016] In general, the utility model has the following advantages:

[0017] The anodized layer can improve the hardness of the outer surface of the inner ring of the bearing. By setting a self-lubricating polymer on the inner surface of the outer ring of the bearing, the self-lubricating polymer has a lower friction coefficient and better wear resistance, and can form a friction pair with the outer surface of the inner ring of the bearing with self-lubricating properties. At the same time, the uniform porous structure formed by anodization on the outer surface of the inner ring of the bearing has a micro-cutting effect on the self-lubricating polymer, which is conducive to the mechanical interlocking between the cut polymer debris and the uniform porous structure, making it easier to form a self-lubricating layer and reach the steady-state wear period faster, thereby improving the friction conditions, improving the friction and wear performance of the spherical bearing, and extending the service life of the spherical bearing. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 Schematic diagram of the micro-cutting effect of uniform porous structure and self-lubricating polymer;

[0019] Figure 2 It is a schematic diagram of the structure of the utility model;

[0020] Figure 3 It is a schematic diagram of the structure of the inner ring of the bearing;

[0021] Figure 4 This is a surface morphology diagram of a phosphoric acid anodized layer prepared on the outer surface of a bearing inner ring according to the utility model.

[0022] In the figure:

[0023] 1-bearing outer ring; 2-self-lubricating polymer; 21-polymer debris; 3-bearing inner ring; 31-bearing inner ring matrix; 32-anodized layer; 33-holes. DETAILED DESCRIPTION

[0024] The utility model will be further described in detail below.

[0025] like Figure 2 As shown, a self-lubricating spherical bearing comprises a bearing outer ring 1, a bearing inner ring 3 and a self-lubricating polymer 2 arranged between the bearing outer ring 1 and the bearing inner ring 3, the bearing inner ring 3 is sleeved inside the bearing outer ring 1, the self-lubricating polymer 2 is bonded to the inner surface of the bearing outer ring 1, and the outer surface of the bearing inner ring 3 is provided with an anodized layer 32, the anodized layer 32 is a uniform porous structure, and the anodized layer 32 and the self-lubricating polymer 2 form a pair of friction pairs.

[0026] In this embodiment, the inner surface of the bearing outer ring 1 and the outer surface of the bearing inner ring 3 are both spherical structures.

[0027] like Figure 3 As shown, the bearing inner ring 3 includes a bearing inner ring substrate 31 , and an anodized layer 32 is provided on the outer surface of the bearing inner ring substrate 31 .

[0028] The diameter of the pores 33 of the uniform porous structure is 100 nm.

[0029] The hardness of the anodized layer 32 is ≥300 HV.

[0030] The self-lubricating polymer 2 is a polytetrafluoroethylene composite material, and its components include polytetrafluoroethylene, polyimide, polyphenylene ester and carbon fiber powder. Preferably, polytetrafluoroethylene is 75-90%, with a particle size of 30 μm; polyimide is 5-10%, with a particle size of 10-20 μm; polyphenylene ester is 0-5%, with a particle size of 10-20 μm; and carbon fiber powder is 5-10%, with a length of 100-400 μm.

[0031] The method for preparing the anodized layer 32 comprises the following steps:

[0032] The outer surface of the bearing inner ring 3 is pretreated, including grinding, polishing and degreasing; the spherical plain bearing inner ring 3 is ultrasonically cleaned in anhydrous ethanol for 5 minutes, and then ultrasonically cleaned in deionized water;

[0033] The bearing inner ring 3 is anodized to form an anodized layer 32 on the outer surface of the bearing inner ring 3; the electrolyte used in the anodizing treatment is 0.4 mol / L phosphoric acid, the voltage of the anodizing treatment is 50 V, the treatment time is 1 hour, and the temperature is controlled at 15-20°C by a water bath method to ensure the uniformity of the oxidation reaction. The cathode is platinum and the anode is the spherical bearing inner ring 3. The spacing is controlled to be 5 cm, and a magnetic stirrer is used for stirring to promote the electrolyte to uniformly contact the outer surface of the bearing inner ring 3 and prevent bubbles from gathering to obtain a uniform anodized layer 32.

[0034] The anodized bearing inner ring 3 is ultrasonically cleaned with deionized water and then placed in a microwave dryer for microwave drying. The microwave drying temperature is 80° C. and the time is 30 minutes.

[0035] A method for preparing a self-lubricating spherical bearing comprises the following steps:

[0036] Polytetrafluoroethylene (75-90%, particle size 30μm), polyimide (5-10%, particle size 10-20μm), polyphenylene ester (0-5%, particle size 10-20μm), and carbon fiber powder (5-10%, length 100-400μm) are ultrasonically mixed, the evenly mixed raw materials are placed in a mold for pressing, and finally the pressed sample is heat treated by heating to 380℃ at a rate of 120℃ / h and keeping warm for 3 hours, then cooled to room temperature at a rate of 120℃ / h, and finally ultrasonically treated in anhydrous ethanol for 30 minutes to remove surface pollutants, and then dried and stored, and the preparation of self-lubricating polymer 2 is completed.

[0037] The bearing inner ring 3 with the anodized layer 32, the self-lubricating polymer 2 and the bearing outer ring 1 are assembled into a spherical bearing, wherein the self-lubricating polymer 2 is bonded to the inner surface of the bearing outer ring 1 and forms a friction pair with the bearing inner ring 3, and has good friction and wear performance.

[0038] Figure 4 The surface topography of a phosphoric acid anodized layer 32 is prepared on the outer surface of the bearing inner ring 3.

[0039] Working principle of the utility model: The utility model provides a self-lubricating spherical bearing, the outer surface of the inner ring 3 of the bearing has an anodized layer 32, anodizing is a traditional and effective surface modification method, which can greatly improve the surface hardness of the aluminum alloy, so that the surface hardness of the inner ring 3 of the bearing is increased to 300HV, and has a uniform porous structure of 100nm, and the wear resistance is improved. By arranging a self-lubricating polymer 2 on the inner surface of the outer ring 1 of the bearing, the self-lubricating polymer 2 has a lower friction coefficient and better wear resistance, and can form a friction pair with the outer surface of the inner ring 3 of the bearing with self-lubricating properties, such as Figure 1 As shown, when the inner surface of the bearing outer ring 1 and the outer surface of the bearing inner ring 3 move relative to each other, the uniform porous structure has a micro-cutting effect on the self-lubricating polymer 2 bonded to the inner surface of the bearing outer ring 1, and a mechanical interlocking is formed between the cut polymer debris 21 and the uniform porous structure, which makes it easier to form a self-lubricating layer and reach the steady-state wear period faster, thereby improving the friction conditions, effectively improving the friction and wear performance of the spherical bearing, and extending the service life.

[0040] The above embodiments are preferred implementation modes of the present invention, but the implementation modes of the present invention are not limited by the above embodiments. Any other changes, modifications, substitutions, combinations, and simplifications that do not deviate from the spirit and principle of the present invention should be equivalent replacement methods and are included in the protection scope of the present invention.

Claims

1. A self-lubricating spherical bearing, comprising a bearing outer ring and a bearing inner ring, wherein the bearing inner ring is sleeved inside the bearing outer ring, and characterized in that: A self-lubricating polymer is provided between the outer ring of the bearing and the inner ring of the bearing. The self-lubricating polymer is bonded to the inner surface of the outer ring of the bearing. An anodic oxide layer with a uniform porous structure is provided on the outer surface of the inner ring of the bearing. The anodic oxide layer and the self-lubricating polymer form a friction pair with self-lubricating properties. The uniform porous structure has a micro-cutting effect on the self-lubricating polymer, so that the cut polymer chips form a mechanical interlocking with the porous structure.

2. A self-lubricating spherical plain bearing according to claim 1, characterized in that: The inner surface of the bearing outer ring and the outer surface of the bearing inner ring are both spherical structures.

3. The self-lubricating spherical plain bearing according to claim 1, characterized in that: The bearing inner ring comprises a bearing inner ring substrate, and an anodized layer is arranged on the outer surface of the bearing inner ring substrate.

4. The self-lubricating spherical plain bearing according to claim 1, characterized in that: The pore diameter of the uniform porous structure is 100 nm.

5. The self-lubricating spherical plain bearing according to claim 1, characterized in that: The hardness of the anodized layer is ≥300HV.

6. The self-lubricating spherical plain bearing according to claim 1, characterized in that: The self-lubricating polymer is a polytetrafluoroethylene composite material.

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