Sliding bearing bush with microstructure, preparation method and corresponding sliding bearing

Abstract

The invention discloses a sliding bearing bush with a microstructure, a preparation method and a corresponding sliding bearing. The sliding bearing bush comprises a base body and a lining, the base body comprises a body, a plurality of protruding edges and a plurality of grooves. The plurality of grooves are parallel to each other, and are arranged at intervals with the ribs; a plurality of parallel joint holes are formed in each rib; the liner comprises a friction part, a plurality of liner edges and a plurality of liner pins; wherein the upper surface of the friction part is used for being matched with a main shaft; the lining edges and the lining pins are arranged on the lower surface of the friction part and intersect to form a latticed structure. The lining edges are parallel to one another, extend in the circumferential direction and extend into the grooves, and the lower surfaces of the lining edges are matched with the upper surface of the body; a plurality of liner pins are disposed parallel to each other on each liner ridge, are distributed in the axial direction, and extend into the interior of the engagement hole. The sliding bearing bush provided by the invention is provided with the microstructure joint layer, and the lining is jointed on the base body in a grid form, so that the service life is prolonged.

Description

Technical Field

[0001] The invention relates to a sliding bearing bush with a microstructure, and also relates to a preparation method of the sliding bearing bush and a sliding bearing comprising the sliding bearing bush, belonging to the technical field of bearings. Background Art

[0002] Sliding bearings are widely used in high-speed, precision, and heavy-load applications due to their high operating accuracy, strong impact load bearing capacity, and long service life. They are particularly suitable for large thermal power, hydropower, and wind power generators, nuclear power plant main circulation pumps, ships, rocket engines, and high-speed precision machine tools, and other important equipment, becoming one of the key core components of these equipment. The inner diameter of the sliding bearing is usually more than φ600mm, and the lining materials include Babbitt alloy, copper-based aluminum-based alloy, polyetheretherketone (PEEK), and polytetrafluoroethylene (PTFE), etc. These materials are combined with the matrix by compression molding.

[0003] Babbitt bearings, which mainly include tin-based and lead-based bearing alloys, are known for their anti-friction properties. The bonding of this alloy material to the substrate is achieved through processes such as brazing. However, babbitt bearings require a continuous supply of lubricating oil when used under heavy load. Once the equipment oil system fails, the oil-deficient operation for a short period of time may cause the bearings to burn and the alloy layer to peel off, thereby damaging the shaft diameter. Once the bearing is damaged, the equipment must be shut down to replace the bearing and return it to the factory to repair the shaft diameter. In contrast, sliding bearings lined with molecular polymer materials can continue to operate after the lubricating oil supply is stopped, relying on their self-lubricating properties, and will not cause damage to the bearings and linings even during load reduction shutdowns.

[0004] The main difference between the design of polymer-lined tilting pad thrust bearings and conventional babbitt bearings is the method of bonding the sliding layer to the substrate. Direct bonding of polymers to steel is very difficult due to their limited adhesion. Therefore, an intermediate layer is required to bond the polymer layer to the substrate. In practice, two solutions are most commonly used: one is to weld a copper or steel wire mesh to the substrate, and the other is to sinter a layer of bronze powder onto the substrate. Copper wire mesh was first used as an intermediate layer in polymer bearing applications in the Soviet Union, mainly for bonding polytetrafluoroethylene (PTFE). Sintered bronze layers were developed by GGB (formerly Glacier Metal Co.) in the 1960s and are used to produce PEEK-lined bearings, among other things. In both solutions, bonding is achieved by pressing a polymer sheet against the intermediate layer at high temperature. This allows the polymer to flow into the pores of the intermediate layer and allows the two materials to form a chisel. Another known solution is to make the thrust bearing substrate almost entirely (except for the bracket) of PEEK material, but this solution has low stiffness and is difficult to meet heavy load requirements.

[0005] The polymer material sliding bearing solution is generally to process the substrate surface into a columnar structure, press and bend it, and then mold it with the composite material. Or it can be 3D printed into an umbrella-shaped structure and then molded with the composite material. The above substrate microstructure has problems such as insufficient adhesion and high stress due to protruding sharp corners, which leads to problems such as lining material being punctured by the substrate or stress cracking during the subsequent use of the bearing. Summary of the invention

[0006] The primary technical problem to be solved by the present invention is to provide a sliding bearing with a microstructure.

[0007] Another technical problem to be solved by the present invention is to provide a method for preparing the above-mentioned sliding bearing.

[0008] Another technical problem to be solved by the present invention is to provide a sliding bearing including the above-mentioned sliding bearing bush.

[0009] In order to achieve the above technical objectives, the present invention adopts the following technical solutions:

[0010] According to a first aspect of an embodiment of the present invention, there is provided a sliding bearing bush having a microstructure, which is used to be arranged on the periphery of a main shaft to provide a supporting force, and comprises a base body and a lining; wherein,

[0011] The base comprises a body, a plurality of ridges, and a plurality of grooves; the ridges are arranged on the upper surface of the body and extend along the circumferential direction of the main shaft; the plurality of grooves are parallel to each other and are arranged at intervals from the ridges; a plurality of parallel engaging holes are formed on each ridge, and each engaging hole extends along the axial direction of the main shaft and penetrates the ridges;

[0012] The lining includes a friction portion, a plurality of lining ribs and a plurality of lining pins; wherein the upper surface of the friction portion is used to cooperate with the main shaft; the lining ribs and the lining pins are arranged on the lower surface of the friction portion and intersect to form a grid structure; the lining ribs are parallel to each other and extend in the circumferential direction and extend to the interior of the groove, and the lower surface of the lining ribs cooperates with the bottom surface of the groove; a plurality of the lining pins are arranged parallel to each other on each lining rib, distributed along the axial direction, and extend to the interior of the engaging hole.

[0013] Preferably, the convex ridge further comprises a plurality of cutting slits; wherein,

[0014] The cutting slits correspond to the engaging holes one by one,

[0015] The cutting slit extends parallel to the axial direction and penetrates the upper surface of the base body and the corresponding engaging hole in the radial direction.

[0016] Preferably, in the radial direction, the width of the cutting slit is smaller than the size of the engaging hole.

[0017] Preferably, the width of the cutting seam is determined by the size of the electrode wire used in the wire cutting process to allow the electrode wire to pass through.

[0018] Preferably, the width of the cutting seam is less than 0.4 mm.

[0019] Preferably, the lining completely covers the convex ridge, and the friction portion of the lining is higher than the convex ridge.

[0020] Preferably, the lining further comprises a plurality of connecting parts; wherein,

[0021] The connecting portion is in the shape of a sheet, and among the four sides, the first side is connected to the lining pin, the second side is connected to the lining edge, and the third side is connected to the friction portion.

[0022] Preferably, the upper surface of the lining is an arcuate surface, which is curved along the circumferential direction of the sliding bearing and extends along the axial direction; or the upper surface of the lining is a plane.

[0023] Preferably, the upper surface of the base is a continuous curved surface, and the distribution of wave crests and wave troughs corresponds to the position of the engaging hole; or the upper surface of the base is a plane, or an arc-shaped surface curved along the circumferential direction of the main axis.

[0024] According to a second aspect of an embodiment of the present invention, there is provided a method for preparing the above-mentioned sliding bearing bush, comprising the following steps:

[0025] Step S1: processing the upper surface of the substrate into a circular arc surface;

[0026] Step S2: machining grooves on the upper surface of the substrate to form ridges;

[0027] Step S3: using a wire cutting process to form cutting seams and engaging holes on the convex ridges;

[0028] Step S4: using one of the molding methods such as molding, hot pressing, injection molding or laser welding, the sheet material, powder or liquid is melted and solidified on the upper surface of the substrate to form a lining, and the lining fills the groove, the joining hole and the cutting seam.

[0029] Preferably, in step S3, the cutting seams and the combining holes in each row are formed by one wire cutting and are aligned along the axial direction.

[0030] Preferably, in step S3, N electrode wires are used to simultaneously process N rows of the cutting seams and the combining holes; the electrode wires are arranged in parallel along the circumferential direction of the substrate; wherein N is a positive integer.

[0031] Preferably, the lining completely covers the convex ridge, and the friction portion of the lining is higher than the convex ridge.

[0032] According to a third aspect of an embodiment of the present invention, there is provided a sliding bearing, comprising the above-mentioned sliding bearing bush.

[0033] Compared with the prior art, the sliding bearing provided by the embodiment of the present invention has a microstructured bonding layer, which has the following characteristics: 1) The lining is attached in the form of a grid of intersecting grooves and holes to enhance the adhesion ability; 2) The bonding holes include various forms such as round holes, elliptical holes and polygonal holes to further enhance the adhesion ability; 3) After the microstructured bonding layer is molded and fused with the PEEK material, it can withstand large compressive stress and pulling force and has self-lubricating properties. The present invention also provides a processing technology for the sliding bearing, which uses a wire cutting process to process holes, which can not only improve processing efficiency and reduce costs, but also allow the bonding holes to be interconnected in the radial direction to form a three-dimensional grid-like lining, thereby improving the bonding strength. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 It is a schematic diagram of the shaft system structure of a wind turbine generator set in the prior art;

[0035] FIG2( a ) is a schematic structural diagram of a sliding bearing bush with a microstructure in the first embodiment of the present invention, wherein the upper surface is an arc-shaped surface;

[0036] FIG. 2( b ) is a schematic structural diagram of the sliding bearing in FIG. 2( a ), wherein the upper surface is a plane;

[0037] Figure 3 2(a) is a schematic structural diagram of the substrate;

[0038] Figure 4 It is an enlarged schematic diagram of a partial view A of the substrate in FIG2(a);

[0039] Figure 5 is a schematic top view of the substrate in FIG2(a);

[0040] Figure 6 is a bottom view schematically showing the lining in FIG2( b );

[0041] Figure 7 This is a schematic structural diagram of a second embodiment of the present invention, in which the base includes an elliptical engaging hole;

[0042] Figure 8This is a schematic structural diagram of a second embodiment of the present invention, in which the base includes a polygonal engaging hole;

[0043] Fig. 9 This is a schematic structural diagram of a second embodiment of the present invention, in which the base includes an elliptical engaging hole and an upper surface of a continuous curved surface;

[0044] Fig.10 This is a schematic structural diagram of a second embodiment of the present invention, in which the base includes a polygonal engaging hole and an upper surface of a continuous curved surface;

[0045] Fig.11 This is a schematic structural diagram of a substrate including a cutting groove in a third embodiment of the present invention;

[0046] Fig.12 This is an enlarged schematic diagram of a partial view B of the base in the third embodiment of the present invention. DETAILED DESCRIPTION

[0047] The technical content of the present invention is described in detail below with reference to the accompanying drawings and specific embodiments.

[0048] The technical concept in the embodiment of the present invention is to attach the lining layer with the microstructure of the bearing base, reduce the lining thickness and material consumption, and realize the self-lubrication of the bearing. Specifically, the wire cutting process is used to process holes and continuous curve structures on the inner surface of the bearing base, replacing the dovetail groove used in the prior art to join the wear-resistant lining. The lining adopts a high molecular polymer material with self-lubricating properties so that it can still operate normally when the lubrication of lubricating oil is lost. The bearing base of the prior art adopts a dovetail groove to attach plastic material, or is brazed into a lining through babbitt alloy, so the thickness of the bonding layer is large, the consumption of lining material is large, and the babbitt alloy lining requires oil film lubrication.

[0049] The sliding bearing provided by the embodiment of the present invention can be used in large bearings of generator sets, large equipment, etc. Figure 1 As shown in the figure, taking the shaft system of a wind turbine as an example, the sliding bearing includes multiple bearings, which are arranged on the periphery of the main shaft to provide support for the main shaft. In addition, there is lubricating oil between the bearing and the main shaft, and the lubricating oil forms a continuous oil film between the bearing and the main shaft, separating the bearing and the main shaft. When the lubricating oil film is lost, the bearing and the main shaft are in direct contact, which will cause a bearing burn accident in a short time.

[0050] The sliding bearing 100 provided in the embodiment of the present invention has an axial direction of the rotor (eg Figure 1 The axial direction of the rotor is the main axis, the radial direction is the radial direction of the rotor, the circumferential direction is the circumferential direction of the rotor, and the tangential direction is the tangential direction of the rotor.

[0051] First embodiment

[0052] As shown in FIG. 2( a ) and FIG. 2( b ), an embodiment of the present invention provides a sliding bearing 100 with a microstructure, comprising a substrate 1 and a lining 2. The substrate 1 is a metal material, such as low carbon steel. The lining 2 is a high molecular polymer material with self-lubricating properties, such as polyetheretherketone (PEEK), and has a thickness of 4 to 5 mm.

[0053] like Figure 3 As shown, the substrate 1 includes a main body 11, a plurality of ridges 14, a plurality of grooves 12 and a plurality of engaging holes 13, and is an integrally formed structure. The substrate 1 can be of any shape, and only requires the upper surface 1a of the ridge 14 to match the lower surface 2b of the lining 2. Optionally, as shown in FIG2(a), the upper surface 1a of the substrate 1 is an arcuate surface, which is bent along the circumferential direction of the sliding bearing 100 and extends along the axial direction, and the curvature corresponds to the rotor. Optionally, as shown in FIG2(b), the upper surface 1a of the substrate 1 is a plane to accommodate the situation where the sliding bearing is used as a thrust bearing. Optionally, the upper surface 1a of the substrate 1 is a circumferential surface to accommodate the situation where the sliding bearing is used as a sleeve bearing.

[0054] The upper surface 1a of the base 1 is provided with a plurality of grooves 12, and the grooves 12 are groove structures extending in the circumferential direction. The plurality of grooves 12 are parallel to each other. In other words, the length direction of the groove 12 is perpendicular to the axial direction of the sliding bearing 100, the width direction is parallel to the axial direction, and the depth direction is the radial direction. Moreover, the bottom surface 121 of the groove 12 is a curved surface that bends and extends in the circumferential direction.

[0055] like Figure 4 As shown, a plurality of engaging holes 13 are provided on the main body 1. The engaging holes 13 are close to the upper surface 1a of the base body 1, but are not connected to the upper surface 1a. The engaging holes 13 are parallel to each other, extend along the axial direction of the sliding bearing 100, and pass through the base body 1. On the cross section perpendicular to the axial direction, the line connecting the center points of adjacent engaging holes 13 extends along the circumferential direction. In other words, the engaging holes 13 are arranged along the circumferential direction of the sliding bearing 100, and pass through the main body 11 along the axial direction. The virtual line connecting the points on each engaging hole 13 that are farthest from the axis of the bearing is a pitch circle 131. Preferably, the engaging holes 13 are circular holes.

[0056] Preferably, the bending radius of the groove bottom surface 121 (the distance from each point on the bottom surface to the axis of the sliding bearing 100) is greater than the radius of the pitch circle 131. Optionally, the bending radius of the groove bottom surface 121 is not greater than the radius of the pitch circle 131, and the difference between the two radii is not greater than the radial dimension of the engagement hole 13. In other words, the engagement hole 13 intersects with the groove 12.

[0057] It is worth noting that when the bending radius of the groove bottom surface 121 is greater than the pitch circle 131, the groove bottom surface 121 does not intersect with the engaging hole 13, and the groove bottom surface 121 is an arc surface. When the bending radius of the groove bottom surface 121 is not greater than the pitch circle 131, and the difference between the radii of the two is not greater than the radial dimension of the engaging hole 13, the groove bottom surface 121 intersects with the engaging hole 13, and at this time, the groove bottom surface 121 is a continuous curved surface formed by the intersection of the curved surface and the hole.

[0058] like Figure 5 As shown, the upper surface of the body 11 includes a plurality of ridges 14, and grooves 12 are formed between adjacent ridges 14. That is, the grooves 12 and the ridges 14 are spaced apart from each other. Among them, the ridges 14 and the body 11 are integrally formed of the same material. The width of the grooves 12 and the ridges 14 is in the millimeter order, for example, 1 to 9 mm, and more preferably 1 mm. The size of the engaging hole 13 is in the millimeter order, for example, 0.5 to 9 mm, and more preferably 1 mm. Therefore, the grooves 12, the ridges 14 and the engaging holes 13 constitute the microstructure of the bearing, and are collectively referred to as the engaging layer of the sliding bearing 100. The edges of the engaging layer of the sliding bearing 100 are blunt structures, and do not have protruding sharp point structures, so as to avoid damaging the lining 2.

[0059] The lining 2 includes a friction portion 20, a plurality of lining ribs 21 and a plurality of lining pins 22. The upper surface of the friction portion 20 is the upper surface 2a of the lining 2, which is used to cooperate with the main shaft. The plurality of lining ribs 21 and the plurality of lining pins 22 are located below the friction portion 20. The lining 2 is filled with the grooves 12 and the engaging holes 13, completely covers the convex ribs 14, and is in contact with and connected to the substrate 1 through the engaging layer. It is worth noting that the upper surface 2a of the lining 2 provided in the embodiment of the present invention is the upper surface of the sliding bearing 100, and is also the contact surface of the sliding bearing 100 and the rotor friction. Optionally, as shown in FIG2(a), the upper surface 2a of the lining 2 is an arc-shaped surface, which is bent along the circumferential direction of the sliding bearing 100 and extends along the axial direction, and the curvature corresponds to the rotor. Optionally, as shown in FIG2(b), the upper surface 2a of the lining 2 is a plane to adapt to the situation where the sliding bearing is used as a thrust bearing. Optionally, the upper surface 2a of the lining 2 is a circumferential surface to adapt to the situation where the sliding bearing is used as a sleeve bearing. Preferably, the upper surface 2a of the lining 2 is higher than the upper surface 1a of the base 1, and the distance between the two surfaces is 2 to 4 mm. In other words, the height of the friction part 20 of the lining 2 is higher than the ridge 14, or in other words, the upper surface 2a of the lining 2 is 2 to 4 mm higher than the upper surface of the ridge 14.

[0060] like Figure 6As shown, the area where the lining 2 is joined to the substrate 1 includes lining ribs 21 and lining pins 22, that is, the lower surface 2b of the lining 2 is in contact with and connected to the upper surface 1a of the substrate 1. Among them, a plurality of lining ribs 21 extend along the circumferential direction of the sliding bearing 100, are distributed in parallel with each other, and correspond to the shape of the groove 12. A plurality of lining pins 22 extend along the axial direction of the sliding bearing 100, are distributed in parallel with each other, and correspond to the shape of the engaging hole 13. The lining pins 22 extend to the inside of the engaging hole 13, and can be connected to the axially adjacent lining pins 22, or not connected, depending on the process conditions.

[0061] In other words, the lining ribs 21 and the lining pins 22 are the contoured structures of the bonding layer of the substrate 1. The lining ribs 21 and the lining pins 22 form a grid-like structure of the lining 2 located in the bonding layer, which can enhance the structural strength of the lining 2. At the same time, the lining ribs 21 extend into the pitch circle 131 and the groove 12, and the lining pins 22 extend into the bonding hole 13. Therefore, the tensile strength of the lining 2 in the radial direction is better than that of the prior art, the adhesion between the lining 2 and the substrate 1 is improved, and it is not easy to cause peeling damage to the lining 2.

[0062] Second embodiment

[0063] Different from the above-mentioned embodiment of the invention, the radial cross-section projection of the engaging hole 13 is a long hole. Optionally, the radial cross-section projection of the engaging hole 13 is an elliptical hole, such as Figure 7 Optionally, the radial cross-section projection of the engagement hole 13 is a polygonal hole, such as Figure 8 In other words, the engaging hole 13 has a recessed structure 132 extending along the tangential direction.

[0064] like Fig. 9 and Fig.10 As shown, the upper surface 1a of the base 1 is a continuous curved surface, and the distribution of the crests and troughs corresponds to the positional relationship of the engaging holes 13, the crest is at the center point of the engaging hole 13, and the trough is at the midpoint of the line connecting the center points of the two engaging holes 13. The macroscopic shape of the upper surface is still curved along the circumferential direction of the sliding bearing 100, or extends horizontally (when the sliding bearing is used as a thrust bearing).

[0065] Optionally, the sliding bearing 100 further includes an oil supply channel (not shown in the figure) connecting the upper surface of the sliding bearing 100 and the oil system to transport lubricating oil to the upper surface of the sliding bearing 100 .

[0066] Third embodiment

[0067] Different from the above-mentioned embodiment of the invention, the body 1 further includes a cutting slit 15. Fig.11 As shown, the cutting slit 15 is an open slit structure that penetrates the upper surface of the substrate 1 and the engaging hole 13 from top to bottom and extends parallel to the axial direction. The slit edge of the cutting slit 15 is a blunt structure.

[0068] Preferably, the cutting slit 15 penetrates the upper surface of the substrate 1 and the engaging hole 13 in the radial direction. Optionally, the cutting slit 15 penetrates the upper surface of the substrate 1 and the engaging hole 13 in the vertical direction.

[0069] Preferably, the extension line of the cutting slit 15 coincides with the center of the engaging hole 13. Optionally, the extension line of the cutting slit 15 is offset to one side of the center of the engaging hole 13.

[0070] The engaging holes 13 correspond to the cutting slits 15 one by one. More preferably, the radial symmetry line of the cutting slits 15 passes through the center point of the engaging hole 13 (for example, the center of a circle when the cross section of the engaging hole is a circle). And the cutting slits are arranged in a matrix, and each row (a row in a direction perpendicular to the ridge) of the cutting slits and engaging holes is formed by one line cutting and aligned along the axial direction; each row of the cutting slits is located on the same ridge 14.

[0071] like Fig.12 As shown, the width x of the cutting slit 15 is less than 0.4 mm, and more preferably 0.1 to 0.3 mm. Preferably, the size of x corresponds to the width of the electrode wire in the wire cutting process to allow the electrode wire to pass through.

[0072] It is worth noting that, because the size of the coupling hole 13 is 0.5-9 mm, the width x of the cutting slit 15 is smaller than the size of the coupling hole 13 .

[0073] like Figure 6 As shown, it is more preferable that a connecting portion 220 is formed between the friction portion 20 of the lining 2 and the lining pin 22, and the three are formed in one piece. More specifically, the connecting portion 220 is roughly sheet-shaped, and among the four sides, the first side is connected to the lining pin 22, the second side is connected to the lining rib 21, and the third side is connected to the friction portion 20. Therefore, in the three vertical directions in the three-dimensional space, the lining rib 21, the lining pin 22 and the connecting portion 220 all form a three-dimensional grid shape that supports each other. Such a structure can provide support force in all directions, thereby increasing the service life of the bearing.

[0074] The lining 2 is filled with the groove 12, the joint hole 13 and the cutting seam 15, completely covers the ridge 14, and is in contact and connected with the substrate 1 through the joint layer. Because the seam edge is a blunt structure and the width is only 0.1 to 0.3 mm, the cutting seam 15 will not cause stress concentration and will not damage the lining 2.

[0075] Fourth embodiment

[0076] An embodiment of the present invention provides a method for preparing a sliding bearing with a microstructure, which at least includes the following steps.

[0077] Step S1: Turning the upper surface 1a of the base body 1 into a circular arc surface.

[0078] Step S2: milling the groove 12 with a milling cutter.

[0079] Step S3: machining the cutting seam 15 and the joining hole 13 by wire cutting process.

[0080] The wire cutting process mainly uses molybdenum wire or copper wire as the electrode wire, and relies on the pulsed electric spark discharge between the electrode wire and the workpiece to generate high temperature to melt or vaporize the metal to form a cut or groove. The wire cutting process also processes the blunt structure of the cut seam 15.

[0081] Preferably, in this step, multiple electrode wires are used to simultaneously process multiple rows of cutting seams 15 and connecting holes 13. The multiple electrode wires are parallel to each other and arranged along the circumferential direction of the substrate 1.

[0082] Preferably, the stepping distance of the electrode wire from one row of processed cutting seams 15 to the next row of cutting seams 15 to be processed is the distance between the axes of two adjacent rows of engaging holes 13, or an integer multiple of the distance between the axes of two adjacent rows of engaging holes 13.

[0083] Step S4: using one of the molding methods such as molding, hot pressing, injection molding or laser welding, the sheet material, powder or liquid is melted and solidified on the upper surface of the substrate to form a lining, and the lining fills the groove, the joining hole and the cutting seam.

[0084] Preferably, a resin (e.g., PEEK, PTFE) powder is molded on the substrate 1 to form the lining 2. As an alternative, a resin sheet is molded onto the substrate 1 and the lining 2 is formed by hot pressing. As an alternative, a resin powder or a resin liquid is injected onto the substrate 1 and the lining 2 is formed by injection molding. Optionally, a resin sheet or a resin powder is covered on the substrate 1 and formed by laser welding to form the lining 2. As an alternative, a resin powder is sprayed on the substrate 1 and the lining 2 is formed by curing.

[0085] Fifth embodiment

[0086] An embodiment of the present invention provides a sliding bearing, which includes one or more sliding bearing bushes provided by the above embodiments.

[0087] Commonly used engineering plastic linings and substrates use dovetail grooves for bonding, or traditional babbitt alloy bearings use dovetail grooves as the bonding layer between the substrate and the lining, but the depth and width of the dovetail grooves are relatively large. For example, the minimum dovetail groove depth recommended by the national standard is 8mm and the width is 45-60mm, so the thickness of the babbitt alloy lining is more than 10mm. The procurement cost of polymers such as PEEK is 5-10 times that of babbitt alloys. When polymer materials are used to replace babbitt alloys as lining materials, if the existing technology of dovetail grooves as bonding layers is still used, it will inevitably cause material waste and cost waste, so a low-height bonding layer is required.

[0088] Such low-height bonding layers provided by the prior art are mostly manufactured using additive technology, which is costly and has insufficient bonding strength. Or they have sharp points and edges, which are prone to stress concentration and damage the lining of the polymer material. The microstructure bonding layer proposed in the embodiment of the present invention uses a wire cutting process to form a continuous smooth curved surface, which can form a recessed structure in the tangential direction of the bonding hole, increase adhesion, and is easy to manufacture. Combined with a special wire cutting machine with multiple wire channels, it is possible to process a row of axial bonding holes at a time, greatly reducing production time and cost, improving processing accuracy, and allowing each row of bonding holes to be accurately aligned. Moreover, the distribution uniformity and dimensional accuracy of all bonding holes are improved, so that the bonding force between metal and resin (plastic) is increased, the force is more evenly applied, and the service life of the bushing and bearing is thereby increased.

[0089] In summary, the sliding bearing provided by the embodiment of the present invention includes a base and a lining. The base includes a main body, a plurality of ridges, and a plurality of grooves; the ridges are arranged on the upper surface of the main body and extend along the circumferential direction of the main shaft; the plurality of grooves are parallel to each other and are arranged at intervals with the ridges; a plurality of parallel engaging holes are provided on each ridge, and each engaging hole extends along the axial direction of the main shaft and penetrates the ridges. The lining includes a friction portion, a plurality of lining ridges, and a plurality of lining pins; the upper surface of the friction portion is used to cooperate with the main shaft; the lining ridges and the lining pins are arranged on the lower surface of the friction portion and intersect to form a grid-like structure; the lining ridges are parallel to each other and extend along the circumferential direction and extend to the inside of the grooves, and the lower surface of the lining ridges cooperates with the upper surface of the main body; a plurality of lining pins are arranged on each lining ridge in parallel with each other, distributed along the axial direction, and extend to the inside of the engaging holes.

[0090] Compared with the prior art, the embodiment of the present invention provides a sliding bearing with microstructure, a preparation method and a corresponding sliding bearing, wherein a cutting seam 15 arranged along the circumference is generated on a substrate 1 by a wire cutting process, and a groove 12 in the circumferential direction is provided to form a lining 2 of a polymer material attached to a bonding layer. The sliding bearing 100 saves the material usage of the lining 2, reduces the material cost, and utilizes the self-lubricating property of the polymer material to realize operation without lubricating oil, thereby improving the anti-fault capability of the sliding bearing.

[0091] It should be noted that the above embodiments are only examples, and the technical solutions of the various embodiments can be combined, all within the protection scope of the present invention.

[0092] It should be noted that the term "formation" in the present invention means that it can be obtained by one of a variety of processes and is not limited to the processes listed in the embodiments. The order of steps in the present invention can be changed according to actual needs, the order of steps can be changed, and serial processing can also be changed to parallel processing, which is not limited to the order of steps listed in the embodiments.

[0093] The orientation or position relationship indicated by terms such as "thickness", "depth", "up", "down", "horizontal", "vertical", "top", and "bottom" are based on the orientation or position relationship shown in the accompanying drawings and are only for the convenience of describing the present invention and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0094] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0095] The above is a detailed description of a sliding bearing with a microstructure, a preparation method and a corresponding sliding bearing provided by the present invention. For a person skilled in the art, any obvious changes made to it without departing from the essence of the present invention will constitute an infringement of the patent right of the present invention and will bear corresponding legal liabilities.

Claims

1. A sliding bearing with a microstructure, used to be arranged on the periphery of a main shaft to provide a supporting force, characterized in that It includes a substrate and a lining; wherein, The base comprises a body, a plurality of ridges, and a plurality of grooves; the ridges are arranged on the upper surface of the body and extend along the circumferential direction of the main shaft; the plurality of grooves are parallel to each other and are arranged at intervals from the ridges; a plurality of parallel engaging holes are formed on each ridge, and each engaging hole extends along the axial direction of the main shaft and penetrates the ridges; The lining includes a friction portion, a plurality of lining ribs and a plurality of lining pins; wherein the upper surface of the friction portion is used to cooperate with the main shaft; the lining ribs and the lining pins are arranged on the lower surface of the friction portion and intersect to form a grid structure; the lining ribs are parallel to each other and extend in the circumferential direction and extend to the interior of the groove, and the lower surface of the lining ribs cooperates with the bottom surface of the groove; a plurality of the lining pins are arranged parallel to each other on each lining rib, distributed along the axial direction, and extend to the interior of the engaging hole.

2. The sliding bearing according to claim 1, characterized in that The convex ridge also includes a plurality of cutting slits; wherein, The cutting slits correspond to the engaging holes one by one, The cutting slit extends parallel to the axial direction and penetrates the upper surface of the base body and the corresponding engaging hole in the radial direction.

3. The sliding bearing bush according to claim 2, characterized in that: In the radial direction, the width of the cutting slit is smaller than the size of the engaging hole.

4. The sliding bearing bush according to claim 3, characterized in that: The width of the cutting slot is determined by the size of the electrode wire used in the wire cutting process to allow the electrode wire to pass through.

5. The sliding bearing bush according to claim 3, characterized in that: The width of the cutting seam is less than 0.4 mm.

6. The sliding bearing according to any one of claims 1 to 5, characterized in that: The lining completely covers the convex ridge, and the friction portion of the lining is higher than the convex ridge.

7. The sliding bearing according to any one of claims 2 to 5, characterized in that The lining also includes a plurality of connecting parts; wherein, The connecting portion is in the shape of a sheet, and among the four sides, the first side is connected to the lining pin, the second side is connected to the lining edge, and the third side is connected to the friction portion.

8. The sliding bearing bush according to claim 6, characterized in that: The upper surface of the lining is an arc-shaped surface, which is bent along the circumferential direction of the sliding bearing and extends along the axial direction; or the upper surface of the lining is a plane.

9. The sliding bearing bush according to claim 8, characterized in that: The upper surface of the base is a continuous curved surface, and the distribution of wave crests and wave troughs corresponds to the position of the engaging hole; or the upper surface of the base is a plane, or an arc-shaped surface curved along the circumferential direction of the main axis.

10. A method for preparing a sliding bearing bush, used for preparing the sliding bearing bush as claimed in any one of claims 2 to 9, characterized in that The following steps are involved: Step S1: processing the upper surface of the substrate into a circular arc surface; Step S2: machining grooves on the upper surface of the substrate to form ridges; Step S3: using a wire cutting process to form cutting seams and engaging holes on the convex ridges; Step S4: using one of the molding methods such as molding, hot pressing, injection molding or laser welding, the sheet material, powder or liquid is melted and solidified on the upper surface of the substrate to form a lining, and the lining fills the groove, the joining hole and the cutting seam.

11. The preparation method according to claim 10, characterized in that: In the step S3, in a direction perpendicular to the ridges, the cutting seams and the combining holes in each row are formed by one wire cutting and aligned along the axial direction.

12. The preparation method according to claim 11, characterized in that: The step S3 uses N electrode wires to simultaneously process N rows of the cutting seams and the combining holes; the electrode wires are arranged in parallel along the circumferential direction of the substrate; wherein N is a positive integer.

13. The preparation method according to claim 10 or 11, characterized in that: The lining completely covers the convex ridge, and the friction portion of the lining is higher than the convex ridge.

14. A sliding bearing, characterized in that It comprises the sliding bearing as claimed in any one of claims 1 to 9.

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