Maintenance-free main shaft bearing of wind generating set
By adopting a plastic oil bearing structure in the main shaft bearing of the wind turbine, the problem of grease leakage is solved, achieving long service life, low vibration, low noise and high reliability, making it suitable for applications in harsh environments.
Patent Information
- Application Number
- CN202520387460.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Priority Date
- 2025-02-21
- Filing Date
- 2025-03-07
- Publication Date
- 2026-02-03
- Estimated Expiration
- 2035-03-07
AI Technical Summary
Existing wind turbine main shaft bearings suffer from grease leakage during use, which leads to shortened bearing life, reduced reliability, and susceptibility to contamination in harsh environments, affecting their performance.
The bearing adopts a plastic oil bearing structure, which fills the gap between the inner and outer rings of the bearing with a solid lubricant formed by mixing polymer powder, lubricating oil and additives, forming a porous structure that provides stable lubrication performance and acts as a seal to prevent grease leakage.
It achieves long service life, low vibration, low noise, low rotational torque and high reliability, can provide stable lubrication under various environmental conditions, reduce maintenance costs, improve bearing reliability and efficiency, and prevent contaminants from entering.
Smart Images
Figure CN223868401U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model belongs to bearing technical field, concretely relates to plastic body oil bearing and its application method on wind driven generator main shaft. BACKGROUND
[0002] The wind driven generator is the electric power equipment of converting wind energy into mechanical work and then outputting alternating current. The wind driven generator main shaft bearing is one of its core components, which is used for supporting the main shaft and bearing complex load. However, the existing main shaft bearing has the problem of lubricating grease leakage in the use process, which leads to the shortening of bearing life and the reduction of reliability, and is easily polluted in the harsh environment, which affects its performance. SUMMARY
[0003] The utility model discloses a bearing and its application method in the wind driven generator set main shaft bearing, to solve the problem in the background art.
[0004] To achieve the above object, the utility model provides the following technical scheme: bearing, comprising:
[0005] The inner circle and the outer circle are arranged, and the inner circle is inside the outer circle, a plurality of rolling elements are arranged in an annular array between the outer peripheral surface of the inner circle and the inner peripheral surface of the outer circle, and raceways matched with the rolling elements are formed on the outer peripheral surface of the inner circle and the inner peripheral surface of the outer circle.
[0006] The plastic body oil can fill all the gaps between the inner and outer rings of the bearing, or it can only wrap around the retainer, or the gap between the retainer and the outer ring, or the gap between the retainer and the inner ring.
[0007] Further, the plastic body oil is made into a block and then inlaid in the gap between the retainer and the rolling body, so that it contacts the roller or the raceway or both.
[0008] A plurality of rolling elements are arranged in an annular array between the outer peripheral surface of the inner circle and the inner peripheral surface of the outer circle, and the rolling elements can be single row, two rows or multiple rows along the axial direction.
[0009] And a retainer is arranged between adjacent rolling elements, which can be integral or segmented; the integral retainer is made of metal materials, including copper alloy, stainless steel, carbon steel, aluminum alloy, etc. without limitation; the material of the segmented retainer includes PE, PEEK, UPE, PA, PI, etc. without limitation.
[0010] Preferably, the plastic body oil is formed by mixing and heating polymer powder, lubricating oil and additives.
[0011] Preferably, the polymer powder comprises polyethylene PE, ultra-high molecular weight polyethylene, polyimide or PEEK polymer.
[0012] Preferably, the content of lubricating oil in the plastic oil is 10% to 90%.
[0013] An application method of plastic oil in a wind turbine main shaft bearing, comprising the following steps:
[0014] S1: selecting polyethylene PE, ultra-high molecular weight polyethylene, polyimide or PEEK polymer as the base material;
[0015] S2: preparing the high-temperature-resistant self-lubricating material into a powder through a crushing device, and mixing with lubricating oil and additives to form a viscous fluid lubricating medium, and the content of lubricating oil in the lubricating medium is between 10% and 90%;
[0016] S3: injecting the lubricating medium into the bearing, so that the injected lubricating medium fills the internal gap of the bearing and maintains the viscous fluid state;
[0017] S4: heating and curing the lubricating medium injected into the bearing to form a porous oil-containing lubricating material, i.e. plastic oil.
[0018] Preferably, the injection method of the lubricating medium into the bearing includes injection molding, mold pressing and vulcanization.
[0019] Preferably, before the step of injecting the lubricating medium into the bearing, so that the injected lubricating medium fills the internal gap of the bearing and maintains the viscous fluid state:
[0020] S31: placing the inner ring inside the outer ring, so that the inner ring and the outer ring are concentrically placed, and a plurality of rolling elements are placed between the inner ring and the outer ring;
[0021] S32: the rolling bodies are separated from each other by the retainer.
[0022] Compared with the prior art, the application has the advantages of:
[0023] The bearing proposed in this invention features long service life, low vibration, low noise, small rotational torque, and high reliability. Under alternating and vibrational loads, it effectively solves the problem of grease leakage. Furthermore, because the polymeric oil is an oil-saturated polymer matrix, it completely fills the free space within the bearing, encapsulating the rolling elements and cage to form a porous structure with millions of micropores. These micropores can hold the lubricating oil and retain it within the material through surface tension. During operation, the lubricating oil moves towards the friction pair surface under the capillary action of the micropores, forming a lubricating oil film. When operation stops, the lubricating oil is reabsorbed into the polymer and stored. This structure provides stable and long-lasting lubrication performance under various environmental conditions, reduces maintenance costs, improves bearing reliability and efficiency, and simultaneously reduces environmental pollution. Because of the very small gap between the rolling elements and the raceway, the bearing components can rotate freely. The plastic oil provides excellent lubrication for the bearing and plays an extremely effective sealing role by completely filling the bearing cavity. When applied to the main shaft bearing of wind turbine generator sets, this plastic oil bearing not only solves the problem of grease leakage, but also provides good protection under harsh environmental conditions, completely preventing grease leakage. Attached Figure Description
[0024] Figure 1 This is a schematic diagram of the spindle bearing application structure of this utility model;
[0025] Figure 2 This is a schematic diagram of the structure of the bearing (self-aligning roller bearing) of this utility model;
[0026] Figure 3 This is a schematic diagram of the bearing (cylindrical roller bearing) of this utility model;
[0027] Figure 4 This is a schematic diagram of the bearing (tapered roller bearing) of this utility model;
[0028] Figure 5 This is a schematic diagram of the bearing inlay plastic body oil scheme of this utility model;
[0029] Figure 6 This is a schematic diagram of the single-unit plastic oil block structure of the bearing of this utility model;
[0030] Figure 7 This is a schematic diagram of the multi-group plastic oil block structure of the bearing of this utility model;
[0031] In the diagram: 100, main bearing; 1, inner ring; 2, outer ring; 3, rolling element; 4, plastic oil; 5, cage; 6, single set of plastic oil blocks; 7, receiving space; 8, protrusion; 9, hollow part. Detailed Implementation
[0032] Clearly and completely describe the technical scheme in the embodiments of the utility model with reference to the drawings in the embodiments of the utility model, apparently, the described embodiments are only some embodiments of the utility model, and not all embodiments. Based on the embodiments in the utility model, all other embodiments obtained by the person skilled in the art without creative labor belong to the scope of the utility model protection.
[0033] Please refer to Figures 1-4 The utility model provides the following technical scheme:
[0034] The bearing comprises:
[0035] The bearing inner ring 1 and the outer ring 2, and the inner ring 1 is inside the outer ring 2, a plurality of rolling elements 3 are arranged in an annular array between the outer circumferential surface of the inner ring 1 and the inner circumferential surface of the outer ring 2, and the outer circumferential surface of the inner ring 1 and the inner circumferential surface of the outer ring 2 are both provided with rolling grooves matched with the rolling elements 3; the gap between the inner ring and the outer ring is filled with solid lubricant, which is referred to as plastic oil.
[0036] And a retainer 5 is arranged between adjacent rolling elements 3, the retainer can be integral type or segmented type; the integral type retainer is made of metal material, including copper alloy, stainless steel, carbon steel, aluminum alloy and the like without limitation; the material of the segmented type retainer includes PE, PEEK, UPE, PA, PI and the like without limitation.
[0037] And the plastic oil 4 is formed by mixing and heating polymer powder, lubricating oil and additives, and the content of the lubricating oil in the plastic oil 4 is 10% to 90%.
[0038] The polymer powder includes polyethylene PE, ultra-high molecular weight polyethylene, polyimide or PEEK polymer.
[0039] And the utility model provides a kind of bearing and its application in wind turbine generator set main shaft bearing, and the plastic oil bearing has long life, low vibration, low noise, small rotation torque and high reliability etc.
[0040] To achieve the above object, the utility model provides the following technical scheme: Embodiment
[0041] Step one: prepare polymer matrix: select polyethylene PE or ultra-high molecular weight polyethylene (uhmwpe), polyimide (PI), PEEK and other polymers as matrix material, and prepare it into powder.
[0042] Step two: Prepare the lubricating medium: The high-temperature-resistant self-lubricating material is prepared into a powder state and mixed with lubricating oil and additives to form a viscous fluid-like lubricating medium. The lubricant content of the lubricating medium can be adjusted according to specific needs, usually between 10% and 90%.
[0043] Step three: Inject the bearing: The lubricating medium is injected into the bearing, which can be injected by injection molding, molding, vulcanization, etc. The injected lubricating medium fills the internal voids of the bearing and maintains its viscous fluid state.
[0044] Step four: Heat curing: The lubricating medium injected into the bearing is subjected to heat curing treatment to form a porous oil-containing lubricating material. The heating temperature and time can be optimized according to the characteristics of the base material and the lubricating medium.
[0045] Example two: The utility model provides a kind of plastic body oil main shaft bearing and its manufacturing method, which uses plastic body oil as lubricating medium, fills porous oil-containing lubricating material, and realizes long-term lubrication and leakage prevention at the same time. The bearing has excellent lubricating performance and leakage prevention characteristics, and is suitable for use in harsh environments.
[0046] The plastic body oil main shaft bearing of the utility model mainly comprises a porous oil-containing lubricating material, a lubricating medium and a bearing. The porous oil-containing lubricating material uses polyethylene PE or ultra-high molecular weight polyethylene (uhmwpe), polyimide (PI), PEEK and other polymers as the base material, and a porous lubricating medium composed of self-lubricating materials such as graphite made of high-temperature-resistant materials. The lubricating medium is formed into a viscous fluid state by mixing polymer powder, lubricating oil and additives. After heat curing treatment, it forms a porous oil-containing lubricating material.
[0047] Plastic body oil can provide stable lubricating oil supply for the bearing. When the metal surface (such as the raceway of the bearing) slides on the plastic body oil, it is covered with a uniform and consistent oil film, then only in the case of a moderate increase in operating temperature, the oil is pushed to the surface of the polymer matrix, and this "low" oil in the polymer matrix is because the oil has a higher thermal expansion coefficient than the polymer matrix, and because the viscosity of the oil decreases as the temperature rises, when the bearing stops running, the excess oil will be reabsorbed into the polymer matrix.
[0048] Example three: As Figures 1-4As shown, the plastic oil bearing in this embodiment includes rolling elements, raceways, a cage, and plastic oil. The rolling elements, including balls or rollers, roll on the raceways to support and transmit loads. The cage maintains a uniform distribution of the rolling elements. The plastic oil encapsulates the rolling elements and cage by filling the gaps between the cage and raceways, forming a porous structure composed of millions of micropores. These micropores can hold and retain the lubricating oil within the plastic oil. The lubricating oil penetrating the gaps provides excellent lubrication for the bearing from the outset.
[0049] Plasticizing oil is actually a two-in-one solution; it lubricates the bearing and provides an extremely effective seal by completely filling the bearing cavity.
[0050] Plastic oil allows bearings to prefill with more available lubricant. Bearings using plastic oil contain two to four times more oil than conventional grease-lubricated bearings because the bearings are completely filled with plastic oil, while grease-lubricated bearings typically only have about one-third of their free space filled with grease.
[0051] Plastic oil prevents contaminants from entering. Because the plastic oil completely fills the bearing cavity, contaminants have difficulty reaching the bearing contact surfaces. In highly contaminated environments, plastic oil bearings do not require seals or relubrication. The plastic oil contains a large amount of oil and is reusable, thus eliminating the need for relubrication. Furthermore, plastic oil bearings retain the lubricant internally, so even on vertical shafts, no seals are required to maintain bearing lubrication.
[0052] Plastic oil bearings are resistant to chemicals and high gravity. The polymer matrix of the plastic oil is unaffected by most chemicals. The plastic oil is an integral part of the bearing, so the lubricant will not be ejected even under high centrifugal forces.
[0053] Example 4: Figures 5-6 As shown, the plastic oil bearing in this embodiment includes rolling elements, raceways, a cage, and plastic oil. The rolling elements, including balls or rollers, roll on the raceways to support and transmit loads. The cage maintains a uniform distribution of the rolling elements. The plastic oil partially encapsulates the rolling elements and cage by embedding and filling the gaps between the cage, rolling elements, and raceways, forming a strong adhesion to the cage. Using the plastic oil as a lubricating medium, it provides excellent lubrication for the bearing.
[0054] To achieve the above objectives, this utility model provides the following technical solution:
[0055] Step 1: Prepare the polymer matrix: Select polyethylene (PE) or ultra-high molecular weight polyethylene (UHMWPE), polyimide (PI), PEEK and other polymers as matrix materials, and prepare them into powder form.
[0056] Step Two: Preparing the Lubricating Medium: The high-temperature resistant self-lubricating material is prepared into powder and mixed with lubricating oil and additives to form a viscous fluid lubricating medium. The lubricant content of the lubricating medium can be adjusted according to specific needs, typically between 10% and 90%.
[0057] Step 3: Inject the lubricating medium into the mold, which can be formed using methods such as injection molding, compression molding, or vulcanization. The formed plastic block is used for subsequent embedding.
[0058] Step 4: Insert the plastic oil block (single or multiple plastic oil blocks) into the gap between the cage, rolling elements and raceway, partially enclosing the rolling elements and cage, and firmly attaching it to the cage through the structural form.
[0059] Figure 5 This is a schematic diagram of the bearing inlay plastic body oil scheme of this utility model; Figure 6 It consists of a single set of plastic oil blocks, arranged in a double-row array of several; Figure 7 Multiple groups of plastic oil are injection molded into a single unit, and then several are assembled into a complete circle. The plastic oil provides lubrication for the bearing, employing a partial filling or embedding method to achieve lubrication while also enabling it to withstand higher speeds.
[0060] It should be further stated in this application that: reference Figure 6 As shown, a double-row array is formed by single sets of plastic oil blocks 6. Each single set of plastic oil blocks is provided with a receiving space 7 to enclose a cage, rolling element, or raceway, or the double-row array encloses the cage or is embedded in the raceway. More preferably, each single set of plastic oil blocks 6 has a protrusion 8 on both sides, which, together with the receiving space 7, engages with the cage, rolling element, or raceway.
[0061] Reference Figure 7 As shown, multiple sets of plastic body oil are injection molded into a single unit, and then several are assembled into a complete circle. Further, firstly, multiple sets... Figure 6 A single set of plastic oil blocks is injection molded into a single unit, which has an arc-shaped structure. Multiple arc-shaped plastic oil blocks are then assembled into a complete circle, which is then used to enclose the cage or rolling elements. It should be noted that the structure of this single set of plastic oil blocks is not particularly limited. Figure 6 The preferred structure is a hollow structure with an arc structure, which is then spliced together to form a complete circle.
[0062] Further optimization, refer to Figure 7 As shown, through Figure 6 After the single-unit plastic oil block 6 is assembled, Figure 7A hollow part 9 is formed in the plastic body oil, which can play a role of buffering the plastic body oil, preventing over-extrusion and causing seepage of lubricating oil.
[0063] Embodiment five: in addition, a preparation method of the plastic body oil main shaft bearing is provided:
[0064] Step one: prepare the bearing body, retainer and plastic body oil.
[0065] Step two: heat and solidify to complete the preparation of the plastic body oil block, and the plastic body oil block is matched with the geometric surface of the gap.
[0066] Step three: embed the plastic body oil block in the retainer, so that it is in contact with the raceway or rolling body.
[0067] Step four: assemble the bearing body and the retainer together to complete the preparation of the plastic body oil bearing.
[0068] Although the embodiments of the utility model have been shown and described, it can be understood by those skilled in the art that various changes, modifications, replacements and variations can be made to these embodiments without departing from the principles and spirits of the utility model, and the scope of the utility model is defined by the appended claims and their equivalents.
Claims
1. A maintenance-free wind turbine generator main shaft bearing, characterized in that: include: The bearing has an inner ring (1) and an outer ring (2), with the inner ring (1) located inside the outer ring (2). Multiple rolling elements (3) are arranged in a ring array between the outer circumferential surface of the inner ring (1) and the inner circumferential surface of the outer ring (2). Raceways matching the rolling elements (3) are opened on both the outer circumferential surface of the inner ring (1) and the inner circumferential surface of the outer ring (2). Solid lubricant is filled between the inner ring (1) and the outer ring (2) and between the raceways and the rolling elements (3).
2. The maintenance-free wind turbine generator main shaft bearing according to claim 1, characterized in that: The rolling element (3) is configured as a single row, two rows or multiple rows along the axial direction.
3. The maintenance-free wind turbine main shaft bearing according to claim 1, characterized in that: A cage (5) is provided between adjacent rolling elements (3). The cage (5) can be integral or segmented. The integral cage is made of metal, including any one of copper alloy, stainless steel, carbon steel, and aluminum alloy. The segmented cage is made of any one of PE, PEEK, UPE, PA, and PI. The solid lubricant is plastic oil (4).
4. The maintenance-free wind turbine main shaft bearing according to claim 3, characterized in that: The plasticizing oil (4) fills all the gaps between the inner ring (1) and the outer ring (2) or wraps around the retainer (5) or fills the gap between the retainer (5) and the outer ring (2) or fills the gap between the retainer (5) and the inner ring (1).
5. The maintenance-free wind turbine main shaft bearing according to claim 3, characterized in that: The plastic oil (4) is in block form and is embedded in the gap between the cage (5) and the rolling element (3), so that it contacts the rolling element (3), or contacts the raceway, or contacts both simultaneously.
6. The maintenance-free wind turbine main shaft bearing according to claim 5, characterized in that: The plastic oil (4) is made of polyethylene (PE), ultra-high molecular weight polyethylene, polyimide or PEEK polymer as the base material, and is mixed with lubricating oil and additives to form a viscous fluid lubricating medium. After being injected into the bearing, it is heated and cured to form a porous oil-containing lubricating material. These micropores can contain the lubricating oil and retain it in the material through surface tension.
7. A maintenance-free wind turbine main shaft bearing according to claim 6, characterized in that: The lubricating oil content in the plastic oil (4) is 10% to 90%.
8. The maintenance-free wind turbine main shaft bearing according to claim 7, characterized in that: The plastic oil (4) provides excellent lubrication for the bearing and provides an extremely effective seal by completely filling the bearing cavity.