Variable pitch bearing using plastic oil particles as lubricating medium
By using microporous oil-containing structure plastic oil particles or inlay blocks as lubricating media in pitch bearings, the problem of leakage of traditional lubricants is solved, self-lubricating performance and stable lubrication are achieved, and maintenance costs and environmental pollution are reduced.
Patent Information
- Application Number
- CN202421179838.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-28
- Publication Date
- 2025-04-29
- Estimated Expiration
- 2034-05-28
AI Technical Summary
Traditional pitch bearings use liquid oil or grease as lubricants, which has grease leakage problems, resulting in lubrication failure and bearing damage. Frequent grease replenishment will increase costs and cause environmental pollution.
Microporous oil-containing structure plastic oil particles or inlay blocks are used as lubricating media. With built-in lubricating materials, the rolling elements do not need to be frequently refueled or lubricated, reducing maintenance costs and avoiding environmental pollution.
It achieves self-lubricating performance, reduces friction and wear, avoids environmental pollution, reduces maintenance costs, and has stable and long-lasting lubricating performance.
Smart Images
Figure CN222810911U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to a bearing lubrication technology for a wind power generator set, in particular to a variable pitch bearing which utilizes microporous oil-containing structural plastic oil particles or inlaid blocks as lubricating media. Background Art
[0002] The variable pitch bearing is a key component in a wind turbine generator set. It is used to connect the hub and the blades so that the blades can adjust their angles according to changes in wind speed to optimize power generation efficiency and protect the wind turbine. Traditional variable pitch bearings use liquid oil or grease as lubricants, but there is a problem of grease leakage, which leads to lubrication failure and bearing damage. The existing solution is mainly to add grease, which cannot fundamentally solve the leakage problem. In addition, the lost lubricant will also cause environmental pollution. Frequent grease replenishment will not only increase costs, but also make maintenance difficult due to high-altitude operations. Therefore, there is a need for a variable pitch bearing that can solve the grease leakage problem from the source and achieve maintenance-free. Utility Model Content
[0003] In view of the shortcomings of the prior art, the utility model provides a variable pitch bearing using microporous oil-containing structured plastic oil particles or inlaid blocks as a lubricating medium. Due to the built-in lubricating material, the rolling elements do not need frequent oiling or lubrication, thus reducing maintenance costs and avoiding environmental pollution.
[0004] To achieve the above purpose, the utility model provides the following technical solutions:
[0005] A variable pitch bearing using microporous oil-containing structure plastic oil particles or inlay blocks as lubricating medium, comprising an outer ring, an inner ring, rolling elements, a retainer and plastic oil particles / inlay blocks, wherein the retainer is used to keep the rolling elements evenly distributed between the outer ring and the inner ring, the plastic oil particles / inlay blocks are used for lubricating the rolling elements, and the plastic oil inlay blocks are inlaid in the retainer. Specifically comprising: comprising an outer ring, an inner ring, a rolling element, a retainer and plastic oil particles, wherein the retainer is used to keep the rolling elements evenly distributed between the outer ring and the inner ring, the plastic oil particles are used for lubricating the rolling elements, and the rolling elements adopt a single-row four-point contact method to provide radial force and bidirectional axial force; the outer ring is drilled with mounting holes along the radial direction and sealed with plugs; during installation, the rolling elements, retainers and plastic oil particles are sequentially inserted through the holes; the plastic oil particles are in different shapes, specifically tetrahedral, wedge-shaped, prism-shaped, honeycomb-shaped, spherical, and ellipsoidal.
[0006] As a further solution of the utility model, the plastic oil particles are polymers such as polyethylene PE, ultra-high molecular weight polyethylene, polyimide or PEEK as the base material, and are mixed with lubricating oil and additives to form a viscous fluid-like substance, which is cured by heating to form microporous oil-containing lubricating particles or mosaic blocks, and the micropores inside the micropores adsorb saturated lubricating oil, which is stored in the polymer micropores through surface tension. During the movement, the lubricating oil moves to the surface of the friction pair under the influence of extrusion and heat under the action of microporous capillaries to form a lubricating oil film, and when the operation stops, the lubricating oil will be re-absorbed into the polymer and stored. The plastic oil particles can provide stable and lasting lubrication performance under various environmental conditions.
[0007] In the utility model, the pitch bearing is installed between the blade and the hub; according to the structural form of the gear, it is divided into an external gear bearing and an internal gear bearing (used for electric gear pitch) and a gearless bearing (used for hydraulically driven pitch or toothed belt driven pitch).
[0008] As a further solution of the utility model, the rolling element is a steel ball, and the rolling element provides radial force and bidirectional axial force in a single-row four-point contact manner. Sealing devices are also provided at both ends of the retaining frame to prevent the leakage of plastic oil particles. The outer ring is provided with radial drilling mounting holes, and the mounting holes are drilled radially on the outer ring, and blocked with plugs, and the plugs are positioned with tapered pins. This type of variable pitch bearing is designed with four point contacts, which can withstand large radial force and bidirectional axial force at the same time, and is suitable for bearing complex loads. It is usually composed of an outer ring, an inner ring, a steel ball and a retaining frame, and the inner and outer rings have arc grooves to ensure that the steel balls are evenly distributed when bearing loads in different directions.
[0009] As a further solution of the utility model, the inner ring includes an inner upper half ring and an inner lower half ring. When installing, the rolling element, the retaining frame and the plastic oil particles are directly placed, and then the inner upper half ring and the inner lower half ring are locked by screws. The rolling element adopts double-row rollers to provide radial force and bidirectional axial force. Two parallel roller rows are used to bear heavy loads, which is suitable for bearing huge radial force and certain bidirectional axial force. Each roller row can bear the load independently, providing higher stability and load-bearing capacity.
[0010] As a further solution of the utility model, the outer ring includes an outer upper half ring and an outer lower half ring, and the rolling element is a cylindrical roller. When installing, the rolling element, the retaining frame and the plastic oil particles are directly placed between the outer upper half ring and the outer lower half ring, and some particles are injected through the injection hole. The outer upper half ring and the outer lower half ring are locked by screws. The rolling element adopts three rows of rollers to provide load-bearing capacity and rigidity. Compared with the double-row design, the three-row roller bearing provides higher load-bearing capacity and rigidity, and is suitable for oversized wind turbine blades. This structure can distribute the load more evenly and reduce the stress of a single roller.
[0011] As a further solution of the utility model, the rolling element is a cylindrical roller, which is used for the cross roller of the bearing. The mounting hole is drilled radially on the outer ring and blocked with a plug. During installation, the rolling element and the cage are inserted through the mounting hole in sequence. The rollers are arranged in a cross pattern, which can provide a higher radial and axial load capacity in a smaller space while maintaining the rotation accuracy. It is suitable for application scenarios where space is limited but high rigidity and load capacity are required.
[0012] As a further solution of the utility model, the rolling element is a cylindrical roller, which is used for the cross roller of the bearing. The mounting hole is drilled radially on the outer ring and sealed with a plug. During installation, the rolling element, the retaining cage and the plastic oil particles are put into the mounting hole in sequence at intervals. Finally, the plug is positioned by a tapered pin, and the sealing device on the outside prevents external impurities from entering the interior of the bearing.
[0013] The rolling element of the utility model can also adopt a ball-column combined bearing: for turntable bearings in situations where the axial load is particularly heavy and the radial load is relatively light, different rollers are combined, with cylindrical rollers bearing the axial load and spherical rollers bearing the radial load, which is called a ball-column combined turntable bearing. The ball-column combined turntable bearing mainly bears the axial load and has a poor ability to withstand overturning moment.
[0014] The utility model has the following beneficial effects:
[0015] The utility model provides a microporous structure plastic oil particle variable pitch bearing. Due to the built-in lubricating material, the rolling elements do not need to be frequently refueled or lubricated, which reduces maintenance costs and avoids environmental pollution. Compared with the prior art, the utility model has the following advantages:
[0016] Self-lubricating performance: Plastic oil can automatically form a lubricating film when the bearing is working, reducing the friction between rolling elements and effectively reducing wear.
[0017] No pollution: The plastic oil particles are not easy to lose or volatilize, will not pollute the environment, and meet environmental protection requirements.
[0018] Maintenance-free: Due to the lubrication advantages of the plastic oil particles themselves, there is no need to frequently add or replace lubricants during the operation of the bearing, reducing maintenance costs and manpower investment.
[0019] In order to more clearly illustrate the structural features and functions of the present invention, the present invention is described in detail below in conjunction with the accompanying drawings and specific embodiments. BRIEF DESCRIPTION OF THE DRAWINGS
[0020] Figure 1 This is the structural diagram of the single-row four-point contact ball bearing mentioned in the utility model (internal gear bearing);
[0021] Figure 2 This is a structural diagram of a double-row roller bearing (external gear bearing) mentioned in the utility model;
[0022] Figure 3 This is a structural diagram of a three-row cylindrical roller combination bearing mentioned in the utility model;
[0023] Figure 4 , Figure 5 The following are structural diagrams of two double-row crossed roller bearings mentioned in the present utility model.
[0024] Figure 6 , Figure 7 The utility model discloses a retaining frame inlaid with plastic oil.
[0025] The reference numerals are as follows:
[0026] 1. Outer ring; 11. Outer upper half ring; 12. Outer lower half ring; 2. Inner ring; 21. Inner upper half ring, 22. Inner lower half ring; 3. Rolling element; 31. Ball, 32. Cylindrical roller, 33. Tapered roller; 4. Cage; 5. Plastic oil particles; 6. Sealing device; 7. Tapered pin; 8. Plastic oil mosaic block; 9. Plug; 10. Screw; 1001. Injection hole. DETAILED DESCRIPTION
[0027] The present invention will be further described below in conjunction with the accompanying drawings and related knowledge, and described clearly and completely. Obviously, the described application is only a part of the embodiments of the present invention, rather than all of the embodiments.
[0028] Reference Figure 1-Figure 5 As shown, the utility model provides a variable pitch bearing using microporous oil-containing structure plastic oil particles or inlaid blocks as lubricating medium, including an outer ring 1, an inner ring 2, a rolling body 3 (such as a ball 31, a cylinder 32 or a tapered roller 33), a cage 4, plastic oil particles 5 and a sealing device 6. The utility model has built-in lubricating materials, so that the rolling elements do not need to be frequently refueled or lubricated, which reduces maintenance costs and avoids environmental pollution.
[0029] Outer ring: The outer ring is the outer annular structure of the pitch bearing, usually made of steel or other high-strength materials. The outer ring may have teeth or no teeth on the outer side in the circumferential direction, and the teeth are used for gear meshing transmission. The outer ring can be an integral structure or a split structure (outer upper half ring 11, outer lower half ring 12) according to the combination form;
[0030] Inner ring: The inner ring is the internal annular structure of the pitch bearing, and is usually made of steel or other high-strength materials. The inner ring may or may not have teeth on the inner side of the circumference, and the teeth are used for gear meshing transmission. The inner ring can be an integral structure or a split structure (inner upper half ring 21, inner lower half ring 22) according to the combination form;
[0031] Rolling body: Rolling body 3 is a key component in the pitch bearing, located between the outer ring 1 and the inner ring 2, so that the inner ring and the outer ring can roll relative to each other. Common rolling bodies include steel balls 31, cylindrical rollers 32, conical rollers 33, etc. It should be noted that the rolling body 3 of the utility model is not limited to the shapes listed above.
[0032] Cage: Cage 4 is a structure used to keep rolling elements 3 evenly distributed inside the bearing. It can be made of metal or plastic, which helps to reduce friction and noise while ensuring the stability and life of the bearing.
[0033] Plastic oil particles / inlay blocks: Plastic oil particles 5 or plastic oil inlay blocks 8 are polymers such as polyethylene PE, ultra-high molecular weight polyethylene, polyimide or PEEK as matrix materials, and are mixed with lubricating oil and additives to form a viscous fluid-like substance, which is cured by heating to form microporous oil-containing lubricating particles, and the micropores inside it adsorb saturated lubricating oil, which is stored in the polymer micropores through surface tension. During the movement, the lubricating oil moves to the friction pair surface under extrusion and heat influence under the action of microporous capillaries to form a lubricating oil film, and when it stops running, the lubricating oil will be re-absorbed into the polymer and stored. The plastic oil particles can provide stable and lasting lubrication performance under various environmental conditions. Plastic oil particles can have different shapes, tetrahedral shapes, wedge-shaped blocks, prisms, honeycombs, spheres, ellipsoids, and other structural shapes. The plastic oil inlay block is inlaid on the retaining frame, and usually corresponding grooves or holes are made on the retaining frame, and then the plastic oil is solidified in the grooves or holes to form an inlaid plastic oil block; the purpose is to increase the contact area, match the gap space, and provide more adequate lubrication. As a preferred example of the utility model: the plastic oil particles are spherical. In the utility model, the preparation method of the plastic oil inlay block is the same as that of the plastic oil particles, and the difference lies in the different structural shapes and sizes.
[0034] Sealing device 6: In order to prevent external impurities from entering the bearing and prevent the plastic oil particles 5 from leaking out, the pitch bearing is usually equipped with a sealing device 6. These sealing devices can be rubber sealing rings, metal sealing rings or other forms of sealing structures.
[0035] The variable pitch bearing of the utility model is installed between the blade and the hub; according to the structural form of the gear, it is divided into an external gear bearing ( Figure 2 ) and internal gear bearing ( Figure 1 ), (for electric gear pitch) and gearless bearings ( Figure 4 ) (for hydraulically driven pitch or toothed belt driven pitch).
[0036] In the utility model, the rolling body bears the heavy load through two parallel roller rows; the cage is in the form of an integral type or a segmented type; if it is a segmented cage, it contains an inner frame or has no inner frame structure, and the rolling body, the cage and the plastic oil particles are directly placed in the installation;
[0037] The rolling elements bear heavy loads through three rows of rollers;
[0038] The rolling elements are arranged crosswise;
[0039] The retainer is integrally formed, and a hole or a groove is opened on the retainer. A plastic oil block is embedded in the hole or the groove. The plastic oil block contacts the rolling element to provide long-lasting lubrication for the rolling element.
[0040] Or the retaining frame is a segmented structure, a hole or a groove is opened on the retaining frame, a plastic oil block is embedded in the hole or the groove, and the plastic oil block contacts the rolling body to provide long-lasting lubrication for the rolling body.
[0041] In view of various structural forms and functional requirements, the utility model adopts the following technical solutions:
[0042] Example 1: Reference Figure 1 As shown, single-row four-point contact ball bearing: This type of pitch bearing is designed with four points of contact and can withstand large radial forces and bidirectional axial forces at the same time, and is suitable for situations where complex loads are required.
[0043] It consists of an outer ring 1, an inner ring 2, a steel ball 31 and a cage 4. A mounting hole 1001 is drilled radially in the outer ring and sealed with a plug 9. During installation, the rolling element 3, the cage 4 and the plastic oil particles 5 are inserted through the hole in sequence. The taper pin 7 is used to accurately position the plug to ensure the precise consistency of the arc surface of the raceway. The outer sealing device 6 prevents external impurities from entering the interior of the bearing and prevents the plastic oil particles 5 from leaking out. The sealing device can be a rubber sealing ring, a metal sealing ring or other forms of sealing structure.
[0044] As a further improvement of this case, the retaining frame is made into a segmented structure, and a hollow structure is made in the center of the segmented retaining frame. A plastic oil block 8 is embedded in the hollow structure, so that the retaining frame can also provide plastic oil lubrication when the roller rolls.
[0045] Example 2: Reference Figure 2 As shown, double-row roller bearings: bear heavy loads through two parallel roller rows, and can withstand considerable radial forces and large bidirectional axial forces. Each roller row can bear loads independently, providing higher stability and load-bearing capacity. Consists of an inner ring or an outer ring.
[0046] This example is composed of an outer ring 1, an inner ring 2 (inner upper half ring 21, inner lower half ring 22), a steel ball 31 and a cage 4. The cage is divided into integral type and segmented type. The material can be divided into metal material and non-metal material; the segmented cage can have an inner frame or a structure without an inner frame.
[0047] Since the inner ring is a half-split structure, the rolling elements 3 , the retaining frame 4 and the plastic oil particles 5 are directly placed therein during installation, and then the inner ring is locked by means of the screws 10 .
[0048] The outer sealing device 6 prevents external impurities from entering the bearing and prevents the plastic oil particles 5 from leaking out. These sealing devices can be rubber sealing rings, metal sealing rings or other forms of sealing structures.
[0049] Similarly, as a further improvement of this case, the retaining frame is made into a segmented structure, and a hollow structure is made in the center of the segmented retaining frame. A plastic oil block 8 is installed in the hollow structure, so that the retaining frame can also provide plastic oil lubrication when the roller rolls.
[0050] Example 3: Reference Figure 3 Three-row roller bearings: Compared with double-row designs, three-row roller bearings provide higher load capacity and rigidity, suitable for oversized wind turbine blades. This structure can distribute the load more evenly and reduce the stress on individual rollers.
[0051] This example is composed of an outer ring 1 (outer upper half ring 11, outer lower half ring 12), an inner ring 2, rolling elements 3 (cylindrical rollers 32) and a cage 4. The cage is divided into integral and segmented types. The material of the cage can be divided into metal and non-metal materials; the segmented cage can contain an inner frame or a structure without an inner frame.
[0052] Since the outer ring is a half-structure, the rolling element 3, the retaining frame 4 and the plastic oil particles 5 are directly placed in during installation. Some particles can also be injected through the injection hole 1001, and finally the outer ring is locked by the screw 10.
[0053] The outer sealing device 6 prevents external impurities from entering the bearing and prevents the plastic oil particles 5 from leaking out. These sealing devices can be rubber sealing rings, metal sealing rings or other forms of sealing structures.
[0054] Similarly, as a further improvement of this case, the retaining frame is made into a segmented structure, and a hollow structure is made in the center of the segmented retaining frame. A plastic oil block 8 is installed in the hollow structure, so that the retaining frame can also provide plastic oil lubrication when the roller rolls.
[0055] Example 4: Reference Figure 4As shown, the crossed roller bearing is characterized by a cross-arranged roller, which can provide high radial and axial load capacity in a small space while maintaining rotational accuracy. It is suitable for applications where space is limited but high rigidity and load capacity are required.
[0056] It consists of an outer ring 1, an inner ring 2, rolling elements 3 (cylindrical rollers 32) and a cage 4. A mounting hole is drilled radially in the outer ring and sealed with a plug 9. During installation, the rolling elements 3 and the cage 4 are inserted through the hole in sequence. The cage is segmented. The material can be divided into metal and non-metal materials; it can contain an inner skeleton or a structure without an inner skeleton. The taper pin 7 is used to accurately position the plug to ensure the precise consistency of the arc surface of the raceway. The outer sealing device 6 prevents external impurities from entering the interior of the bearing. The sealing device can be a rubber sealing ring, a metal sealing ring or other forms of sealing structure.
[0057] As a further improvement of this case, the retaining frame is made into a segmented structure, and a hollow structure is made in the center of the segmented retaining frame. A plastic oil block 8 is installed in the hollow structure, so that the retaining frame can also provide plastic oil lubrication when the roller rolls.
[0058] Example 5: Reference Figure 5 As shown, the crossed roller bearing is characterized by a cross-arranged roller, which can provide high radial and axial load capacity in a small space while maintaining rotational accuracy. It is suitable for applications where space is limited but high rigidity and load capacity are required.
[0059] It consists of an outer ring 1, an inner ring 2, rolling elements 3 (cylindrical rollers 32) and a cage 4. A mounting hole is drilled radially in the outer ring and sealed with a plug 9. During installation, the rolling elements 3, the cage 4 and the plastic oil particles 5 are inserted through the hole in sequence. The cage is segmented. The material can be divided into metal and non-metal materials; it can contain an inner skeleton or a structure without an inner skeleton. The taper pin 7 is used to accurately position the plug to ensure the precise consistency of the arc surface of the raceway. The outer sealing device 6 prevents external impurities from entering the interior of the bearing. These sealing devices can be rubber sealing rings, metal sealing rings or other forms of sealing structures.
[0060] Example 6: Reference Figure 6 As shown, as an improved case of the above case, the integral retainer 4 is embedded with a plastic oil block 8; holes are opened on the claws of the retainer along the circumferential direction, and the plastic oil 8 is embedded in the holes. The retainer material can be divided into metal material and non-metal material. A hole or a groove is opened on the retainer, and a plastic oil block is embedded in the hole or the groove. The plastic oil block contacts the rolling element and provides long-lasting lubrication for the rolling element.
[0061] Example 7: Reference Figure 7As shown, as an improved case of the above case, the segmented retainer 4 is embedded with a plastic oil block 8; a groove is opened on the partition of the retainer along the circumferential direction, and the plastic oil 8 is embedded in the groove. The material of the segmented retainer can be divided into metal material and non-metal material. The smallest unit of the segmented retainer can be one, two, or more. A hole or a groove is opened on the retainer, and a plastic oil block is embedded in the hole or the groove. The plastic oil block contacts the rolling element and provides long-lasting lubrication for the rolling element.
[0062] The plastic oil particles / plastic oil inlaid blocks mentioned in the utility model are used not only in the yaw bearings and pitch bearings of wind turbines, but also in heavy equipment such as cranes, tower cranes, metallurgical and mining machinery, etc.
[0063] The technical principle of the utility model is described above in combination with the specific embodiments, which are only the preferred implementation methods of the utility model. The protection scope of the utility model is not limited to the above embodiments, and all technical solutions under the idea of the utility model belong to the protection scope of the utility model. Those skilled in the art can think of other specific implementation methods of the utility model without creative labor, and these methods will fall within the protection scope of the utility model.
Claims
1. A pitch bearing using plastic oil particles as a lubricating medium, characterized in that: It includes an outer ring, an inner ring, rolling elements, a retaining frame and plastic oil particles. The retaining frame is used to keep the rolling elements evenly distributed between the outer ring and the inner ring. The plastic oil particles are used to lubricate the rolling elements. The rolling elements adopt a single-row four-point contact method to provide radial force and bidirectional axial force. The outer ring is drilled with mounting holes along the radial direction and sealed with plugs. During installation, the rolling elements, the retaining frame and the plastic oil particles are inserted in sequence through the holes. The plastic oil particles are in different shapes, specifically tetrahedron, wedge block, prism, honeycomb, sphere and ellipsoid.
2. A variable pitch bearing using plastic oil particles as a lubricating medium as claimed in claim 1, characterized in that: The rolling elements bear heavy loads through two parallel roller rows; the cage is of integral or segmented type; if it is a segmented cage, it contains an inner frame or has no inner frame structure. During installation, the rolling elements, cage and plastic oil particles are directly placed.
3. A pitch bearing using plastic oil particles as a lubricating medium as claimed in claim 1, characterized in that: The rolling elements support heavy loads via three rows of rollers.
4. A pitch bearing using plastic oil particles as a lubricating medium as claimed in claim 1, characterized in that: The rolling elements are arranged crosswise.
5. A pitch bearing using plastic oil particles as a lubricating medium as claimed in claim 1, characterized in that: The retaining frame is integrally formed, and a hole or a groove is opened on the retaining frame. A plastic oil block is embedded in the hole or the groove. The plastic oil block contacts the rolling body to provide long-lasting lubrication for the rolling body.
6. A variable pitch bearing using plastic oil particles as a lubricating medium as claimed in claim 1, characterized in that: The retaining frame is a segmented structure, and a hole or a groove is opened on the retaining frame. A plastic oil block is embedded in the hole or the groove. The plastic oil block is in contact with the rolling body to provide long-lasting lubrication for the rolling body.