A solid-liquid composite self-lubricating bearing with a support frame and a preparation method thereof

Abstract

This invention relates to a solid-liquid composite self-lubricating bearing with a support frame and its preparation method. The bearing includes an inner support frame, an outer support layer, a porous oil reservoir, and an inner structural layer. The outer support layer is sleeved on the outer side of the porous oil reservoir, and the inner support frame and inner structural layer are sleeved on the inner side of the porous oil reservoir. A solid lubricant is disposed on the inner support frame, and the inner structural layer is a porous structure. This invention combines the characteristics of oil-impregnated bearings (oil reservoir, self-circulating lubrication) with the high load-bearing capacity and impact resistance of solid-embedded self-lubricating bearings.

Description

Technical Field

[0001] This invention relates to the field of self-lubricating bearing technology, and in particular to a solid-liquid composite self-lubricating bearing with a support frame and its preparation method. Background Technology

[0002] Oil-impregnated bearings are made by pressing, sintering, shaping, and impregnating metal powder and other friction-reducing materials with oil. They can store lubricating oil through their porous structure, achieving self-circulating lubrication. However, due to the porosity of the material, their load-bearing strength is far lower than that of bearings made of cast metal, and they are prone to structural detachment and breakage under heavy loads.

[0003] Solid-insulated self-lubricating bearings are a novel type of self-lubricating bearing that combines the advantages of metal bearings and oil-free bearings. The load is borne by a metal matrix, while lubrication is provided by a solid lubricating material. They feature high load-bearing capacity, impact resistance, and self-lubrication. However, in the initial stages of operation, the solid lubricant cannot provide adequate lubrication, often leading to premature wear due to insufficient lubrication, significantly reducing the bearing's service life. Summary of the Invention

[0004] The purpose of this invention is to provide a solid-liquid composite self-lubricating bearing with a support frame and its preparation method, which can have the characteristics of oil-impregnated bearings with oil storage and self-circulating lubrication, as well as the characteristics of solid embedded self-lubricating bearings with high load-bearing capacity and impact resistance.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a solid-liquid composite self-lubricating bearing with a support frame, comprising an inner support frame, an outer support layer, a porous oil reservoir layer, and an inner structural layer. The outer support layer is sleeved on the outer side of the porous oil reservoir layer, and the inner support frame and the inner structural layer are sleeved on the inner side of the porous oil reservoir layer. A solid lubricant is disposed on the inner support frame, and the inner structural layer is a porous structural layer.

[0006] Furthermore, the inner support frame includes an upper fixing ring and a lower fixing ring, and a plurality of support plates are provided between the upper fixing ring and the lower fixing ring. The support plates divide the space between the upper fixing ring and the lower fixing ring into multiple equally divided openings. The support plates have multiple through holes, and solid lubricant is provided in the through holes. The number of inner structural layers is the same as the number of through holes, and they can be embedded in the through holes.

[0007] Furthermore, the oil reservoir is made of polytetrafluoroethylene and chemical fillers.

[0008] Furthermore, the inner structural layer is made of polytetrafluoroethylene, molybdenum disulfide, and bronze powder.

[0009] Furthermore, the inner support frame and the outer support layer are made of titanium bronze.

[0010] A method for preparing a solid-liquid composite self-lubricating bearing with a support frame, the method comprising the following steps:

[0011] Step S1: The inner support frame structure and the outer support layer structure are obtained by turning and cutting titanium bronze round tubes;

[0012] Step S2: Mix copper powder, tin powder and graphite powder in the specified proportions. After determining the position of the inner support frame structure in the mold, place it in the mold and fill it with the mixed bronze powder. Press it with a press and place the compacted inner ring in a high-temperature furnace for sintering to obtain the inner ring structure blank. After the sintered inner ring cools to room temperature, remove the excess material after sintering from the inner ring and the outer support layer to make the bearing close to the final size.

[0013] Step S3: Drill holes in the inner ring according to the location of the solid lubricant. Then, heat treat the inner ring and the outer support layer and perform high-temperature nitriding. Use a grinding machine to rough grind and fine grind the inner ring and the outer support layer to achieve the required product size and surface finish.

[0014] Step S4: After being baked in a high-temperature oven, polytetrafluoroethylene, molybdenum disulfide and azodicarbonamide are mixed in a certain proportion and then introduced into an injection molding machine. The desired oil reservoir structure is obtained by injection molding through a mold, and defective products are removed by manual inspection.

[0015] Step S5: Combine and assemble the obtained inner ring and outer support layer with the obtained oil storage layer structure, clean and dry them, and then put them into a vacuum oil immersion device. Evacuate the vacuum and maintain it for 40 minutes. After slowly releasing the vacuum until the pressure inside the tank is balanced, take out the parts, dry them, and check for any damage to the appearance.

[0016] Step S6: The graphite is embedded into the hole described in step 4 by mechanical extrusion of the undamaged part to obtain a solid-liquid composite self-lubricating bearing with a support frame.

[0017] Furthermore, in step S2, the sintering temperature is 860°C and the sintering time is 1.5 hours.

[0018] Furthermore, the mixing ratio of copper powder, tin powder and graphite powder is further specified as follows: 88 wt% copper powder, 11.5 wt% tin powder and 0.5 wt% graphite powder are mixed.

[0019] Furthermore, the mixing of polytetrafluoroethylene, molybdenum disulfide, and azodicarbonamide is further described as follows: 85 wt% of polytetrafluoroethylene, 10 wt% of molybdenum disulfide, and 5 wt% of azodicarbonamide are mixed.

[0020] The beneficial effects of this invention are as follows: It combines the processing methods of traditional oil-impregnated bearings and solid-embedded self-lubricating bearings, using common titanium bronze as the support frame material. This material not only possesses advantages such as good friction properties, low material cost, strong structure, and high hardness, but also effectively reduces cracking in oil-impregnated bearings due to longitudinal loads. Furthermore, the solid lubricant embedded in the inner ring effectively reduces frictional vibration during shaft start-up and shutdown due to the shock-absorbing properties of graphite solids, thus ensuring stable shaft operation. The designed oil reservoir and embedded solid lubricant enable the bearing to effectively provide a solid-liquid composite lubricating oil film during oilless operation, further reducing the coefficient of friction and increasing bearing life to a certain extent. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the bearing structure of the present invention;

[0022] Figure 2 This is an exploded view of the bearing of the present invention;

[0023] Figure 3 This is a flowchart illustrating the manufacturing process of the bearing of the present invention.

[0024] The components are: 1. outer support layer, 2. porous oil storage layer, 3. inner support frame, 31. upper fixing ring, 32. lower fixing ring, 33. support plate, 34. through port, 4. solid lubricant, and 5. inner structural layer. Detailed Implementation

[0025] The present invention will be further described below with reference to the accompanying drawings.

[0026] Please see Figures 1 to 3This invention provides an embodiment of a solid-liquid composite self-lubricating bearing with a support frame, comprising an inner support frame 3, an outer support layer 1, a porous oil reservoir 2, and an inner structural layer 5. The outer support layer 1 is sleeved on the outer side of the porous oil reservoir 2, and the inner support frame 3 and the inner structural layer 5 are sleeved on the inner side of the porous oil reservoir 2. A solid lubricant 4 is disposed on the inner support frame 3, and the inner structural layer 5 is a porous structural layer. The inner support frame and the outer support layer 1 are used to bear loads, and the inner support frame and the inner structural layer 5 are combined to form an inner ring. The graphite solid lubricant 4 is embedded in the inner support frame; after being embedded in the structural layer, it is positioned and then perforated for embedding. During use, liquid precipitates from the porous oil reservoir and flows out through the pore structure of the inner porous structural layer, forming a solid-liquid composite lubricating oil film with the solid lubricant 4 to provide lubrication.

[0027] Please continue reading. Figure 2 As shown, in one embodiment of the present invention, the inner support frame 3 includes an upper fixing ring 31 and a lower fixing ring 32. A plurality of support plates 33 are disposed between the upper fixing ring 31 and the lower fixing ring 32. The support plates 33 divide the space between the upper fixing ring 31 and the lower fixing ring 32 into multiple equally divided openings 34. A plurality of through holes are opened on the support plates 33. Solid lubricant 4 is disposed in the through holes. The number of inner structural layers 5 is the same as the number of through holes 34, and they can be embedded in the through holes 34.

[0028] Please continue reading. Figures 1 to 3 As shown, in one embodiment of the present invention, the oil reservoir is made of polytetrafluoroethylene (PTFE) and a chemical filler. The oil reservoir is directly formed by injection molding using PTFE material and a chemical filler.

[0029] Please continue reading from 1 to 20. Figure 3 As shown, in one embodiment of the present invention, the inner structural layer 5 is made of polytetrafluoroethylene, molybdenum disulfide, and bronze powder. The inner structural layer 5 is obtained by pressing, sintering, and shaping polytetrafluoroethylene, molybdenum disulfide, and bronze powder on a support frame after being proportioned.

[0030] Please continue reading. Figures 1 to 3 As shown, in one embodiment of the present invention, the inner support frame 3 and the outer support layer 1 are made of titanium bronze. The inner support frame 3 and the outer support layer 1 are mainly made of titanium bronze, which has the characteristics of easy processing, high strength, and good friction performance.

[0031] Please see Figures 1 to 3 The present invention provides an embodiment: a method for preparing a solid-liquid composite self-lubricating bearing with a support frame, the preparation method comprising the following steps:

[0032] Step S1: The inner support frame structure and the outer support layer 1 structure are obtained by turning and cutting titanium bronze round tubes. Specifically, the structural data models of the inner support frame and the outer support layer 1 are designed using CAD software. Titanium bronze round tubes are turned to obtain columnar raw materials. The raw parts of the support frame structure are obtained by laser cutting, or by drilling and then wire EDM cutting. The edges and corners of the raw parts are then polished to remove burrs. Figure 1 The inner support frame structure and the outer support layer 1 structure shown in the figure;

[0033] Step S2: Mix copper powder, tin powder and graphite powder in the specified proportions. After determining the position of the inner support frame structure in the mold, place it in the mold and fill it with the mixed bronze powder. Press it with a press and place the compacted inner ring in a high-temperature furnace for sintering to obtain the inner ring structure blank. After the sintered inner ring cools to room temperature, remove the excess material after sintering from the inner ring and the outer support layer 1 to make the bearing close to the final size.

[0034] Step S3: Drill holes in the inner ring according to the position of the solid lubricant 4. Then, heat treat the inner ring and the outer support layer 1 and perform high-temperature nitriding. Use a grinding machine to rough grind and fine grind the inner ring and the outer support layer 1 to achieve the required product size and surface finish.

[0035] Step S4: After being baked in a high-temperature oven, polytetrafluoroethylene, molybdenum disulfide and azodicarbonyl are mixed in a certain proportion and then introduced into an injection molding machine. The desired oil reservoir structure is obtained by injection molding through a mold, and defective products are removed by manual inspection.

[0036] Step S5: Combine and assemble the obtained inner ring and outer support layer 1 with the obtained oil storage layer structure, clean and dry them, and then put them into a vacuum oil immersion device. Evacuate the vacuum and maintain it for 40 minutes. After slowly releasing the vacuum until the pressure inside the tank is balanced, take out the parts, dry them, and check for any damage to the appearance.

[0037] Step S6: The graphite is embedded into the hole described in step 4 by mechanical extrusion of the undamaged part to obtain a solid-liquid composite self-lubricating bearing with a support frame.

[0038] Please continue reading. Figures 1 to 3 As shown, in one embodiment of the present invention, the sintering temperature in step S2 is 860°C and the sintering time is 1.5h.

[0039] Please continue reading. Figures 1 to 3As shown, in one embodiment of the present invention, the mixing ratio of copper powder, tin powder and graphite powder is further described as follows: 88 wt% copper powder, 11.5 wt% tin powder and 0.5 wt% graphite powder are mixed.

[0040] Please continue reading. Figures 1 to 3 As shown, in one embodiment of the present invention, the mixing of polytetrafluoroethylene, molybdenum disulfide and azodicarbonamide is further performed by mixing 85 wt% polytetrafluoroethylene, 10 wt% molybdenum disulfide and 5 wt% azodicarbonamide.

[0041] The present invention has the following working principle: The present invention uses an inner support frame and an outer support layer to bear the load, and a porous oil storage layer to store oil for self-circulation lubrication. This makes it not only have the characteristics of oil-impregnated bearings with oil storage and self-circulation lubrication, but also have the characteristics of solid embedded self-lubricating bearings with high load-bearing capacity and impact resistance. It combines the advantages of oil-impregnated bearings and solid embedded self-lubricating bearings, taking the best of each and making up for their own shortcomings, which greatly improves the performance and service life of self-lubricating bearings.

[0042] The above description is only a preferred embodiment of the present invention and should not be construed as a limitation of this application. All equivalent changes and modifications made in accordance with the scope of the patent application of the present invention should be covered by the present invention.

Claims

1. A solid-liquid composite self-lubricating bearing with a supporting frame, characterized in that: It includes an inner support frame, an outer support layer, a porous oil storage layer, and an inner structural layer. The outer support layer is sleeved on the outside of the porous oil storage layer, and the inner support frame and the inner structural layer are sleeved on the inside of the porous oil storage layer. Solid lubricant is disposed on the inner support frame, and the inner structural layer is a porous structure layer. The inner support frame includes an upper fixing ring and a lower fixing ring. Multiple support plates are arranged between the upper fixing ring and the lower fixing ring. The support plates divide the space between the upper fixing ring and the lower fixing ring into multiple equally divided openings. Multiple through holes are opened on the support plates. Solid lubricant is placed in the through holes. The number of inner structural layers is the same as the number of through holes and can be embedded in the through holes.

2. The solid-liquid composite self-lubricating bearing with a supporting frame according to claim 1, characterized in that: The oil reservoir is made of polytetrafluoroethylene and chemical fillers.

3. The solid-liquid composite self-lubricating bearing with a supporting frame according to claim 1, characterized in that: The inner structural layer is made of polytetrafluoroethylene, molybdenum disulfide, and bronze powder.

4. The solid-liquid composite self-lubricating bearing with a support frame according to claim 1, characterized in that: The inner support frame and the outer support layer are made of titanium bronze.

5. A method for preparing a solid-liquid composite self-lubricating bearing with a support frame as described in claim 1, characterized in that: The preparation method includes the following steps: Step S1: The inner support frame structure and the outer support layer structure are obtained by turning and cutting titanium bronze round tubes; Step S2: Mix copper powder, tin powder, and graphite powder in the specified proportions. After determining the position of the inner support frame structure in the mold, place it in the mold and fill it with the mixed bronze powder. The compacted component is pressed using a press and then sintered in a high-temperature furnace to obtain an inner ring structure blank composed of an inner support frame and an inner structural layer. After the sintered inner ring cools to room temperature, excess material is removed from the inner ring and outer support layer to bring the bearing close to its final size. Step S3: Drill holes in the inner ring according to the location of the solid lubricant. Then, heat treat the inner ring and the outer support layer and perform high-temperature nitriding. Use a grinding machine to rough grind and fine grind the inner ring and the outer support layer to achieve the required product size and surface finish. Step S4: After being baked in a high-temperature oven, polytetrafluoroethylene, molybdenum disulfide and azodicarbonamide are mixed in a certain proportion and then introduced into an injection molding machine. The desired oil reservoir structure is obtained by injection molding through a mold, and defective products are removed by manual inspection. Step S5: Combine and assemble the obtained inner ring and outer support layer with the obtained oil storage layer structure, clean and dry them, and then put them into a vacuum oil immersion device. Evacuate the vacuum and maintain it for 40 minutes. After slowly releasing the vacuum until the pressure inside the tank is balanced, take out the parts, dry them, and check for any damage to the appearance. Step S6: The graphite is embedded into the hole described in step 4 by mechanical extrusion of the undamaged part to obtain a solid-liquid composite self-lubricating bearing with a support frame.

6. The method for preparing a solid-liquid composite self-lubricating bearing with a support frame according to claim 5, characterized in that: In step S2, the sintering temperature is 860℃ and the sintering time is 1.5h.

7. The method for preparing a solid-liquid composite self-lubricating bearing with a supporting frame according to claim 5, characterized in that: The mixing ratio of copper powder, tin powder and graphite powder is further defined as follows: 88 wt% copper powder, 11.5 wt% tin powder and 0.5 wt% graphite powder are mixed.

8. The method for preparing a solid-liquid composite self-lubricating bearing with a support frame according to claim 5, characterized in that: The mixture of polytetrafluoroethylene, molybdenum disulfide and azodicarbonamide is further prepared by mixing 85 wt% polytetrafluoroethylene, 10 wt% molybdenum disulfide and 5 wt% azodicarbonamide.

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