A composite sliding bearing

Abstract

The present invention provides a composite sliding bearing. Sealing grooves are respectively arranged on both sides of the outer ring, and sealing rings are installed in the sealing grooves; a ball loading notch is arranged on one end face of the outer ring, the inner ring is inserted into the outer ring through the ball loading notch, and a sealing piece is installed on the ball loading notch; the outer ring and the inner ring form a spherical friction pair, and the spherical friction pair adopts a self-lubricating mode or an oil-lubricating mode. The inner spherical surface of the outer ring and the outer spherical surface of the inner ring can increase the service life by adding an anti-friction coating or a wear-resistant coating. While using the wear-resistant coating, the matrix hardness can be appropriately reduced to improve the impact resistance of the product; the outer diameter of the outer ring and the inner diameter of the inner ring can be designed for anti-friction to protect the mounting seat hole and the mounting mandrel. The anti-friction design includes self-lubricating anti-friction, oil-lubricating anti-friction, coating anti-friction, and oil-lubricating anti-friction + coating anti-friction; the settings of the sealing ring and the sealing piece can prevent external impurities from entering the working area and extend the service life of the bearing.

Description

Technical Field

[0001] The present invention belongs to the technical field of machinery, and particularly relates to a composite sliding bearing with impact resistance, high corrosion resistance, and long service life. Background Art

[0002] Bearings are important basic components in the equipment manufacturing industry. With the rapid development of rail transit such as high-speed railways, subways, and airplanes, the development of China's bearing industry is also in an important strategic opportunity period. Composite sliding bearings working in these special occasions need to have the following characteristics: (1) Impact resistance: Due to the high-speed operating environment of the bearings, the products should have high toughness, impact resistance, and high wear resistance. (2) Strong corrosion resistance: The bearings are installed in multiple exposed positions, with variable temperatures and high humidity. They need to adapt to harsh environments and changing climates, and have very high requirements for the corrosion resistance of the bearings. (3) High protection: Since the operating environment is mostly outdoors and in the wild, dust, salt water, fine sand particles, oil stains and other sundries may enter the functional area and cause the bearings to fail. Therefore, the bearings must have very high protection. (4) Long service life: The special working environment makes it impossible to perform frequent maintenance, so the bearings need to have the performance of long service life. (5) Function of protecting accessories: Since most of the other accessories installed with the bearings are high-cost parts and the replacement cost is high, special bearings should have the function of protecting the accessories. (6) Anti-drop: In order to prevent the outer ring from falling off or rotating with the mounting seat hole, an anti-slip device needs to be set. Summary of the Invention

[0003] In view of this, the present invention provides a composite sliding bearing with impact resistance, high corrosion resistance, and long service life to meet the various requirements of composite sliding bearings under special working conditions.

[0004] The present invention achieves the above technical objectives through the following technical means.

[0005] A composite sliding bearing includes a sealing groove respectively provided on both sides of the outer ring, and a sealing ring is installed in the sealing groove; a ball loading notch is provided on one end face of the outer ring, the inner ring is inserted into the outer ring through the ball loading notch, and a sealing piece is installed on the ball loading notch;

[0006] The outer ring and the inner ring form a spherical friction pair, and the spherical friction pair adopts a self-lubricating method or an oil-lubricating method;

[0007] The outer diameter of the outer ring and the inner diameter of the inner ring are designed for friction reduction; the friction reduction design includes self-lubricating friction reduction, oil-lubricating friction reduction, coating friction reduction, and oil-lubricating friction reduction + coating friction reduction.

[0008] In the above technical solution, the oil-lubricating method is to design oil grooves and oil holes on the outer ring or the inner ring, or to design oil grooves and oil holes on both the outer ring and the inner ring at the same time.

[0009] In the above technical solution, the oil groove is a circumferential groove or multiple circumferential grooves.

[0010] In the above technical solution, the oil groove further includes an axial groove or multiple axial grooves.

[0011] In the above technical solution, the oil groove is a cross groove, and the cross groove includes an 8-shaped groove, a cross-shaped groove or a grid-shaped groove.

[0012] In the above technical solution, an anti-friction coating or a wear-resistant coating is added to the outer spherical surface of the inner ring, or an anti-friction coating or a wear-resistant coating is added to the inner spherical surface of the outer ring, or anti-friction coatings are added to both the outer spherical surface of the inner ring and the inner spherical surface of the outer ring simultaneously, or wear-resistant coatings are added to both the outer spherical surface of the inner ring and the inner spherical surface of the outer ring simultaneously, or a wear-resistant coating is added to the outer spherical surface of the inner ring while an anti-friction coating is added to the inner spherical surface of the outer ring, or an anti-friction coating is added to the outer spherical surface of the inner ring while a wear-resistant coating is added to the inner spherical surface of the outer ring.

[0013] In the above technical solution, the anti-friction coating includes a coating containing sulfide, PTFE, graphite, calcium fluoride, and the wear-resistant coating includes a chromium plating layer, a carbon film coating or a ceramic coating.

[0014] In the above technical solution, the oil lubrication method is: adding an anti-friction coating or a wear-resistant coating to the outer spherical surface of the inner ring, or adding an anti-friction coating or a wear-resistant coating to the inner spherical surface of the outer ring, or adding anti-friction coatings to both the outer spherical surface of the inner ring and the inner spherical surface of the outer ring simultaneously, or adding wear-resistant coatings to both the outer spherical surface of the inner ring and the inner spherical surface of the outer ring simultaneously, or adding a wear-resistant coating to the outer spherical surface of the inner ring while adding an anti-friction coating to the inner spherical surface of the outer ring, or adding an anti-friction coating to the outer spherical surface of the inner ring while adding a wear-resistant coating to the inner spherical surface of the outer ring.

[0015] In the above technical solution, the self-lubrication method is adding a self-lubricating material to the inner spherical surface of the outer ring, and the self-lubricating material is a fabric, a bushing, an FR soft belt, a plastic, a resin or an inlaid self-lubricating composite material.

[0016] In the above technical solution, a wear-resistant coating is added to the outer spherical surface of the inner ring, and the wear-resistant coating includes a chromium plating layer, a carbon film coating or a ceramic coating.

[0017] In the above technical solution, the self-lubricating and anti-friction method is press-fitting or pasting a self-lubricating material on the outer diameter of the outer ring or the inner diameter of the inner ring, and the self-lubricating material is a fabric, a bushing, an FR soft belt, a plastic, a resin or an inlaid self-lubricating composite material.

[0018] In the above technical solution, a rib is provided on the outer diameter surface of the outer ring or the inner diameter surface of the inner ring, or an additional retaining ring is provided.

[0019] In the above technical solution, the self-lubricating material is designed into a single flange structure or a double flange structure.

[0020] In the above technical solution, the coating for friction reduction is achieved by adding a friction reduction coating on the outer diameter surface of the outer ring or the inner diameter surface of the inner ring; the friction reduction coating includes a coating containing sulfide, PTFE, graphite, and calcium fluoride.

[0021] In the above technical solution, the shapes of the sealing ring and the sealing piece are O-ring, lip seal, or sheet seal, and the cross-sectional shapes of the lip seal include Y-shaped, V-shaped, U-shaped, L-shaped, S-shaped, and frame-shaped.

[0022] In the above technical solution, a connection structure is designed on one end face of the outer ring.

[0023] In the above technical solution, the fitting method of the outer ring and the inner ring can be replaced by: the inner ring is a double split structure, or the outer ring is a double split structure, or the outer ring has a slotted assembly structure, or the inner and outer rings are an integral structure.

[0024] The beneficial effects of the present invention are as follows:

[0025] (1) In the present invention, a ball loading notch is provided on one end face of the outer ring, and the inner ring is inserted into the outer ring through the ball loading notch, ensuring that the inner ring is an integral structure and improving the impact resistance of the bearing; the present invention can also select fitting methods such as the outer ring being a double split structure, the inner ring being a double split structure, the outer ring having a slotted assembly structure, and plastic deformation of the integral structure of the inner and outer rings, with diverse designs to meet the needs of various customers; in addition, for the oil lubrication method of the spherical friction pair of the bearing in the present invention, a friction reduction coating or a wear-resistant coating can be selected, and for the friction reduction design of the inner and outer rings, a friction reduction coating can be selected, which can reduce the hardness of the matrix and improve the overall impact resistance of the bearing.

[0026] (2) The surfaces of the bearing exposed outside (such as the end face of the outer ring, the connection structure, and the end face of the inner ring) in the present invention can be treated by methods such as nickel plating, zinc-nickel alloy plating, cadmium plating, zinc plating, chromium plating, painting, electrophoretic painting, powder coating, phosphating, blackening, and passivation to enhance the corrosion resistance of the bearing.

[0027] (3) In the present invention, a sealing groove is respectively provided on both sides of the outer ring, a sealing ring is installed in the sealing groove, a ball loading notch is provided on one end face of the outer ring, and a sealing piece is installed on the ball loading notch. By setting the sealing ring and the sealing piece, it can prevent external impurities from entering the working area and extend the service life of the bearing; in the present invention, there are various shapes for the oil groove design in oil lubrication, which can ensure sufficient lubrication and extend the service life; in addition, the inner and outer rings can be friction-reduced designed as needed to ensure the long life of the customer's mounting hole and mounting mandrel. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 is the front view of the composite sliding bearing described in the present invention;

[0029] Figure 2 is the cross-sectional view of the composite sliding bearing described in the present invention;

[0030] Figure 3 Schematic diagram of the outer ring structure according to the present invention;

[0031] Figure 4 Schematic diagram of the inner ring structure according to the present invention;

[0032] Figure 5 Schematic diagram of the first structure of the oil groove according to the present invention;

[0033] Figure 6 Schematic diagram of the second structure of the oil groove according to the present invention;

[0034] Figure 7 Schematic diagram of the third structure of the oil groove according to the present invention;

[0035] Figure 8 Schematic diagram of the fourth structure of the oil groove according to the present invention;

[0036] Figure 9 Schematic diagram of the fifth structure of the oil groove according to the present invention;

[0037] Figure 10 Schematic diagram of the self-lubricating material pasted according to the present invention;

[0038] Figure 11 Schematic diagram of the base body with a built-in edge according to the present invention;

[0039] Figure 12 Schematic diagram of the single flange structure adopted by the self-lubricating material according to the present invention;

[0040] Figure 13 Schematic diagram of the double flange structure adopted by the self-lubricating material according to the present invention.

[0041] In the figure: 1 - outer ring, 2 - inner ring, 3 - self-lubricating material, 4A - sealing ring, 4B - sealing piece, 101 - inner spherical surface, 102 - outer diameter, 103 - outer ring end face, 104 - connecting structure, 105 - step surface, 106 - sealing groove, 107 - oil hole, 108 - oil groove, 109 - ball loading notch, 201 - outer spherical surface, 202 - inner diameter, 203 - inner ring end face. Detailed implementation manners

[0042] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments, but the protection scope of the present invention is not limited thereto.

[0043] As Figure 1 、 2, as shown in Figures 3 and 4, a composite sliding bearing of the present invention includes an outer ring 1, an inner ring 2, a sealing ring 4A and a sealing piece 4B. The inner spherical surface 101 of the outer ring 1 contacts the outer spherical surface 201 of the inner ring 2 to form a pair of spherical friction pairs, which can realize the swinging and rotating functions; a sealing groove 106 is provided on each side of the outer ring 1, and a sealing ring 4A is installed in each sealing groove 106; a ball loading notch 109 is provided on one end face of the outer ring 1, and the inner ring 2 is installed into the outer ring 1 through the ball loading notch 109, and a sealing piece 4B is installed on the ball loading notch 109. According to actual needs, a connection structure 104 can be provided on one or both end faces of the outer ring 1 for connecting with the mounting seat hole to prevent the outer ring 1 of the bearing from creeping or falling off relative to the mounting seat hole.

[0044] In addition to the method of providing a ball loading notch 109 on the outer ring 1, the assembling method in the present invention can also select methods such as the outer ring being a double split structure, the inner ring being a double split structure, the outer ring having a slotted assembly structure, and the inner and outer rings being processed into an integral structure through plastic deformation. The assembly method of designing a ball loading notch on the outer ring is simple in assembly, and after assembly, the inner and outer rings have better contact and higher strength. The ball loading holes can be designed to avoid the load-bearing area according to the specific radial and axial load-bearing methods of customers, that is, it has easy assembly while not significantly reducing the load-bearing capacity; while the double split of the outer ring and the double split of the inner ring are for environments where it is impossible to design ball loading holes due to design space reasons or environments with relatively high load-bearing requirements. These two methods can avoid the grinding and misalignment between the two half rings by filling diaphragms in the split areas; for products with a low expansion ratio, the slotted assembly method of the outer ring can be adopted; and for products with high load-bearing capacity, high torque, and high contact area requirements, the assembly method of plastic deformation of the integral structure can be adopted.

[0045] In order to further meet the high corrosion resistance, the surfaces of the bearing exposed outside (such as the end face 103 of the outer ring, the connection structure 104, and the end face 203 of the inner ring) can be treated by methods such as nickel plating, zinc-nickel alloy plating, cadmium plating, zinc plating, chromium plating, painting, electrophoretic painting, powder spraying, phosphating, blackening, and passivation to enhance the corrosion resistance.

[0046] In order to prevent the outer ring 1 from falling off or rotating with the mounting seat hole, a connection structure 104 can be designed on one end face of the outer ring 1 as needed. The connection structure 104 of the outer ring 1 can be designed as a flange, etc. After the outer ring 1 is installed into the mounting seat hole, it can be locked with the mounting component through the connection structure 104 to avoid relative creeping or falling off between the outer ring and the seat hole.

[0047] The sealing groove 106 of the outer ring 1 is designed on the outer diameter surface, end face 103 or stepped surface 105 of the outer ring according to specific conditions. The sealing ring 4A is in close contact with the inner ring 1 to prevent dust, muddy water, fine sand particles, and moisture from entering the working area, achieving a high protection function. The shapes of the sealing ring 4A and the sealing piece 4B can be O-ring seals, lip seals, or sheet seals. Lip seals can be further divided into Y-shaped, V-shaped, U-shaped, L-shaped, S-shaped, frame-shaped, etc. according to the cross-sectional shape.

[0048] The spherical friction pair of the bearing adopts two lubrication methods: self-lubrication and oil lubrication. (1) Oil lubrication method: The lubricating medium for oil lubrication is lubricating oil or grease. In order to allow the lubricating medium to enter the working area and be fully lubricated, oil grooves 108 and oil holes 107 need to be designed on the outer ring and the inner ring (only the oil grooves and oil holes are drawn on the outer ring in the inner ring diagram; the oil grooves and oil holes can be designed only on the outer ring or the inner ring, or on both the outer ring and the inner ring at the same time). A circumferential groove ( Figure 5 ) or multiple circumferential grooves can be designed on the inner spherical surface 101 and the outer spherical surface 201. On the basis of the circumferential groove, an axial groove or multiple axial grooves ( Figure 6 ) can also be designed, or directly a cross groove (such as an 8-shaped groove ( Figure 7 ), a cross-shaped groove ( Figure 8 ), a grid-shaped groove ( Figure 9 ) and other groove types) can be designed for lubrication; A friction-reducing coating or wear-resistant coating can be added to the outer spherical surface of the inner ring and the inner spherical surface of the outer ring to increase the working life (it can be that only the outer spherical surface of the inner ring adds a friction-reducing coating or a wear-resistant coating, or only the inner spherical surface of the outer ring adds a friction-reducing coating or a wear-resistant coating, or it can also be: both the outer spherical surface of the inner ring and the inner spherical surface of the outer ring add a friction-reducing coating at the same time, both the outer spherical surface of the inner ring and the inner spherical surface of the outer ring add a wear-resistant coating at the same time, the outer spherical surface of the inner ring adds a wear-resistant coating while the inner spherical surface of the outer ring adds a friction-reducing coating, the outer spherical surface of the inner ring adds a friction-reducing coating while the inner spherical surface of the outer ring adds a wear-resistant coating). The friction-reducing coating includes coatings containing sulfides (molybdenum disulfide, tungsten disulfide, etc.), PTFE (polytetrafluoroethylene), graphite, calcium fluoride, etc. The wear-resistant coating has a chromium plating layer, a carbon film coating, or ceramics, etc.; The friction-reducing coating or wear-resistant coating can be added to the inner and outer rings where the oil grooves and oil holes are designed, or used alone; (2) Self-lubrication method: A layer of self-lubricating material needs to be added to the surface of the outer spherical surface of the outer ring. The self-lubricating material can be fabric, bushing, FR soft tape, plastic, or resin, and can also be an inlaid self-lubricating composite material. A wear-resistant coating in the oil lubrication method can be added to the outer spherical surface of the inner ring to increase the working life. When using the wear-resistant coating, the hardness of the substrate can be appropriately reduced, so as to have better impact resistance while having wear resistance.

[0049] To protect the mounting seat hole and the mounting mandrel, the outer diameter 102 of the outer ring 1 and the inner diameter 202 of the inner ring 2 can be designed for friction reduction as needed. The friction reduction design is divided into self-lubricating friction reduction, oil-lubricating friction reduction, coating friction reduction, and oil-lubricating friction reduction + coating friction reduction. The outer diameter 102 of the outer ring 1 and the inner diameter 202 of the inner ring 2 can be selected from the above 4 types of friction reduction designs respectively, and there is no constraint between the selection methods. (1) Oil-lubricating friction reduction: Oil grooves and oil holes can be designed on the outer diameter 102 of the outer ring 1 and the inner diameter 202 of the inner ring 2 to enable the lubricating medium to be fully lubricated; among them, the shape of the oil groove can be selected from one of the oil-lubricating methods; (2) Self-lubricating friction reduction: A self-lubricating material ( Figure 10 , Figure 1 shows the surface of the inner diameter 202 of the inner ring 2 being press-fitted or pasted with a self-lubricating material 3) for friction reduction. The self-lubricating material can be fabric or bushing or FR soft tape or plastic or resin, and can also be an inlaid self-lubricating composite material; The connection between the self-lubricating material and the matrix is carried out by means of press-fitting or bonding, etc., which can prevent the self-lubricating material from moving or falling off relative to the matrix (outer ring outer diameter surface or inner ring inner diameter surface); By means of providing a rib ( Figure 11 ) on the matrix or adding a retaining ring, the movement of the self-lubricating material can be prevented. The self-lubricating material can also be designed into a single flange such as Figure 12 or a double flange structure such as Figure 13 ; (3) Adding coating friction reduction: By adding a friction reduction coating on the surface of the outer diameter 102 of the outer ring 1 or the inner diameter 202 of the inner ring 2 (refer to the friction reduction coating in the oil-lubricating method), the service life of the mounting seat hole and the mandrel can be extended.

[0050] The above embodiments are the preferred embodiments of the present invention, but the present invention is not limited to the above embodiments. Without departing from the essence of the present invention, any obvious improvements, substitutions or variations that those skilled in the art can make all belong to the protection scope of the present invention.

Claims

1. A composite sliding bearing, characterized in that, It includes a sealing groove (106) respectively provided on both sides of the outer ring (1), and a sealing ring (4A) is installed in the sealing groove (106); a ball loading notch (109) is provided on one end face of the outer ring (1), and the inner ring (2) is inserted into the outer ring (1) through the ball loading notch (109), and a sealing piece (4B) is installed on the ball loading notch (109). The outer ring (1) and the inner ring (2) form a spherical friction pair, and the spherical friction pair adopts a self-lubricating method or an oil-lubricating method. The outer diameter (102) of the outer ring (1) and the inner diameter (202) of the inner ring (2) are designed for friction reduction; the friction reduction design includes self-lubricating friction reduction, oil-lubricating friction reduction, coating friction reduction, oil-lubricating friction reduction + coating friction reduction. The self-lubricating friction reduction is to press-fit or paste a self-lubricating material on the surface of the outer diameter (102) of the outer ring (1) or the inner diameter (202) of the inner ring (2), and the self-lubricating material is a fabric or a bushing or an FR soft belt or a plastic or a resin or an inlaid self-lubricating composite material. The oil-lubricating friction reduction is to design oil grooves and oil holes on the outer diameter (102) of the outer ring (1) and the inner diameter (202) of the inner ring (2). The coating friction reduction is to add a friction reduction coating on the surface of the outer diameter (102) of the outer ring (1) or the inner diameter (202) of the inner ring (2); the friction reduction coating includes a coating containing sulfide, PTFE, graphite, and calcium fluoride.

2. The composite sliding bearing according to claim 1, wherein The oil-lubricating method is to design oil grooves and oil holes on the outer ring or the inner ring, or to design oil grooves and oil holes on both the outer ring and the inner ring at the same time.

3. The composite sliding bearing according to claim 2, characterized in that, The oil groove is a circumferential groove or multiple circumferential grooves.

4. The composite sliding bearing according to claim 3, characterized in that, The oil groove also includes an axial groove or multiple axial grooves.

5. The composite sliding bearing according to claim 2, wherein The oil groove is a cross groove, and the cross groove includes an 8-shaped groove, a cross-shaped groove, or a grid groove.

6. The composite sliding bearing according to claim 2, characterized in that, A friction reduction coating or a wear-resistant coating is added to the outer spherical surface of the inner ring, or a friction reduction coating or a wear-resistant coating is added to the inner spherical surface of the outer ring, or a friction reduction coating is added to both the outer spherical surface of the inner ring and the inner spherical surface of the outer ring at the same time, or a wear-resistant coating is added to both the outer spherical surface of the inner ring and the inner spherical surface of the outer ring at the same time, or a wear-resistant coating is added to the outer spherical surface of the inner ring while a friction reduction coating is added to the inner spherical surface of the outer ring, or a friction reduction coating is added to the outer spherical surface of the inner ring while a wear-resistant coating is added to the inner spherical surface of the outer ring.

7. The composite sliding bearing according to claim 6, characterized in that, The friction reduction coating includes a coating containing sulfide, PTFE, graphite, and calcium fluoride, and the wear-resistant coating includes a chromium plating layer or a carbon film coating or a ceramic coating.

8. The composite sliding bearing according to claim 1, wherein, The oil-lubricating method is: adding a friction reduction coating or a wear-resistant coating to the outer spherical surface of the inner ring, or adding a friction reduction coating or a wear-resistant coating to the inner spherical surface of the outer ring, or adding a friction reduction coating to both the outer spherical surface of the inner ring and the inner spherical surface of the outer ring at the same time, or adding a wear-resistant coating to both the outer spherical surface of the inner ring and the inner spherical surface of the outer ring at the same time, or adding a wear-resistant coating to the outer spherical surface of the inner ring while adding a friction reduction coating to the inner spherical surface of the outer ring, or adding a friction reduction coating to the outer spherical surface of the inner ring while adding a wear-resistant coating to the inner spherical surface of the outer ring.

9. The composite sliding bearing according to claim 1, wherein The self-lubricating method is to add a self-lubricating material to the inner spherical surface of the outer ring, and the self-lubricating material is a fabric or a bushing or an FR soft belt or a plastic or a resin or an inlaid self-lubricating composite material.

10. The composite sliding bearing according to claim 9, characterized in that, A wear-resistant coating is added to the outer spherical surface of the inner ring, and the wear-resistant coating includes a chromium plating layer or a carbon film coating or a ceramic coating.

11. The composite sliding bearing according to claim 1, characterized in that, A retaining edge is provided on the outer diameter surface of the outer ring or the inner diameter surface of the inner ring, or an external retaining ring is added.

12. The composite sliding bearing according to claim 1, characterized in that, The self-lubricating material is designed into a single flange structure or a double flange structure.

13. The composite sliding bearing according to claim 1, characterized in that, The sealing rings (4A) and sealing sheets (4B) are in the shape of O-ring seals, lip seals or sheet seals, and the cross-sectional shape of the lip seals includes Y-shaped, V-shaped, U-shaped, L-shaped, S-shaped, and frame-shaped.

14. The composite sliding bearing according to claim 1, wherein, A connection structure (104) is designed on one end face of the outer ring (1).

15. The composite sliding bearing according to claim 1, characterized in that, The sleeving method of the outer ring (1) and the inner ring (2) can be replaced with: the inner ring is a double split structure, or the outer ring is a double split structure, or the outer ring is a slotted assembly structure, or the inner and outer rings are an integral structure.

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