High-strength low-friction wind power independent variable pitch bearing retainer

Abstract

The utility model provides a high-strength low-friction wind power independent variable pitch bearing retainer which comprises a retainer body, the retainer body is of a metal arc blocky structure, and first oil grooves are formed in the inner wall and the outer wall of the retainer body; a plurality of through pockets for accommodating rolling bodies are formed in the thickness direction of the retainer body; the retainer is reasonable in design structure, the retainer is made of low-carbon steel metal instead of traditional nylon, the overall structural strength of the retainer can be improved, the problem that the retainer is prone to deformation or damage during working is solved, and the service life of the retainer is prolonged. The laser cladding layers are arranged on the inner walls of the pockets and the inner wall and the outer wall of the retainer body through the laser cladding technology, the laser cladding layers are made of aluminum bronze, the laser cladding layers made of the aluminum bronze can make contact with a rolling body and a ferrule, and therefore the friction force of the contact portions can be reduced, and the service life of the rolling body is prolonged. And the problem of abrasion of the retainer, the rolling body and the ferrule at the contact part can be reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of bearing retainer design, and in particular relates to a high-strength and low-friction wind power independent pitch bearing retainer. Background Art

[0002] The independent variable pitch bearing for wind power is a key component in a wind turbine. It is installed between the blades and the hub of a wind turbine. Its main function is to connect the rotor hub and the rotor blades, control the windward angle of the blades, and control the speed of the wind wheel and the output power of the wind turbine. The retaining frame inside the bearing is mainly used to isolate the rolling elements in the raceway. Since the independent variable pitch bearings used in the field of wind turbines are too large, the retaining frame is usually designed as a segmented structure. For example, the Chinese utility model patent with application number CN202323525001.1 discloses an isolation block for an independent variable pitch bearing of a wind turbine, including an isolation block body, a pocket for mounting a rolling element on the isolation block body, an arc groove matching the outer diameter of the rolling element on the two side walls of the pocket, and a straight-through portion for facilitating the entry of the rolling element into the pocket and a limit portion for preventing the rolling element from escaping from the pocket at both ends of the arc groove.

[0003] However, the above-mentioned isolation block (i.e., retaining cage) still has certain defects in actual work: 1. The isolation block is made of plastic material (polybutylene adipamide material) as a whole, and the wind power independent variable pitch bearing has the characteristics of large size and strong load-bearing capacity, which makes it easy for the isolation block made of this plastic material to be deformed or damaged, which is not conducive to extending its service life; 2. If the material of the isolation block is set to metal, since the bearing rings and rolling elements are both made of steel, when the bearing is working, the isolation block can contact the rings or rolling elements respectively, thereby causing the isolation block, bearing rings and rolling elements to have increased wear at the contact position, which will also affect the service life of the bearing; 3. The above-mentioned isolation block only has oil storage tanks on its inner and outer walls to store lubricating oil or grease to reduce friction during operation, but no oil tank is set in the pocket, so that the rolling element also has a high friction problem when contacting the isolation block. Utility Model Content

[0004] The utility model provides a high-strength, low-friction wind turbine independent variable pitch bearing retainer, which is used to solve the problems raised in the above background technology that the existing retainer is made of nylon material and has poor strength, the existing retainer has high friction and easy damage to parts if it is designed with metal material, and the rolling body moves in the pocket, resulting in poor lubrication effect and high friction.

[0005] The technical solution adopted by the present invention is: a high-strength, low-friction wind power independent variable pitch bearing retainer, including a retainer body, the retainer body is a metal arc-shaped block structure, and the inner wall and outer wall of the retainer body are both provided with a first oil groove; a plurality of through pockets for accommodating rolling bodies are opened in the thickness direction of the retainer body, and a protrusion protruding toward the center of the pocket is provided at the inner wall of the pocket near the end of the rolling body, and a second oil groove is opened on the four inner walls of the pocket; the four inner walls of the pocket, as well as the inner wall and outer wall of the retainer body are all provided with a laser cladding layer.

[0006] The retainer body is made of low carbon steel.

[0007] The upper and lower surfaces of the retaining frame body are both provided with outwardly protruding supporting feet.

[0008] Chamfers are provided at upper and lower positions of the inner and outer walls of the retainer body.

[0009] The number of pockets on the retainer body is three.

[0010] The laser cladding layer is an aluminum bronze cladding layer, and its thickness is 0.3mm-0.4mm.

[0011] There are two second oil grooves on the inner wall of each pocket.

[0012] The second oil groove is provided through the retainer body in a thickness direction.

[0013] The first oil groove passes through both ends of the retainer body.

[0014] The beneficial effects of the utility model are:

[0015] (1) The utility model has a reasonable design structure. The cage is made of low-carbon steel instead of traditional nylon, which can improve the overall structural strength of the cage and avoid deformation or damage during operation.

[0016] (2) The utility model adopts laser cladding technology to set a laser cladding layer on the inner wall of the pocket and the inner and outer walls of the retainer body, and the laser cladding layer is made of aluminum bronze. The laser cladding layer of aluminum bronze can be used to contact the rolling elements and the ferrules, thereby reducing the friction force at the contact parts and reducing the wear problem of the retainer, rolling elements and ferrules at the contact parts;

[0017] (3) The utility model not only sets a first oil groove on the inner and outer walls of the cage to reduce the friction resistance between it and the ferrule, but also sets a second oil groove on the inner wall of the pocket to reduce the friction resistance between it and the rolling element, further reducing the wear of the cage. At the same time, the use of two oil grooves can also achieve an oil storage effect, thereby improving the lubrication performance of the bearing during operation;

[0018] (4) The utility model sets chamfers at the upper and lower positions of the inner and outer walls of the retainer, and combines the structural design of the first oil groove to reduce the contact area between the inner and outer walls of the retainer and the bearing ring, thereby reducing the chance of the retainer being damaged due to friction. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 A perspective view of the first embodiment of the present invention;

[0020] Figure 2 This is a cross-sectional view of the first embodiment of the present invention;

[0021] Figure 3 This is a schematic end view of the first embodiment of the present invention;

[0022] Figure 4 This is a three-dimensional diagram of the second embodiment of the present invention.

[0023] in:

[0024] 1. Cage body; 2. Pocket; 3. Support leg; 4. First oil groove; 5. Raised portion; 6. Second oil groove; 7. Laser cladding layer; 8. Chamfer. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0026] Example 1

[0027] like Figure 1-3 A high-strength, low-friction wind turbine independent pitch bearing retainer is shown. It includes a retainer body 1, which is a metal arc-shaped block structure. Specifically, the retainer body 1 is made of low-carbon steel, such as No. 20 steel, replacing traditional nylon. This provides a more stable and high-strength structure, reducing the risk of deformation and damage. The retainer body 1 is an arc-shaped structure, primarily for use in actual use. Multiple retainer bodies 1 can be assembled into a circular ring for placement within the bearing raceway.

[0028] A first oil groove 4 is provided on the inner wall and the outer wall of the retainer body 1. Specifically, the first oil groove 4 runs through both ends of the retainer body 1, and the first oil groove 4 is arranged along the horizontal direction of the retainer body 1. It is mainly used to store lubricating oil or grease in the first oil groove 4 to reduce the friction between the inner and outer walls of the retainer body 1 and the bearing ring. Due to the setting of the first oil groove 4, the contact area between the inner and outer walls of the retainer body 1 and the bearing ring can be reduced, thereby further reducing the friction.

[0029] A number of through pockets 2 for accommodating rolling elements are provided in the thickness direction of the retainer body 1. Specifically, there are three pockets 2 on the retainer body 1. A protrusion 5 protruding toward the center of the pocket 2 is provided on the inner wall of the pocket 2 near the end of the rolling element. That is, after the rolling element is installed in the pocket 2, the end faces of the rolling element face the direction of the protrusion 5. The protrusion 5 can be used to reduce the contact area between the retainer and the end of the rolling element, thereby reducing friction.

[0030] Second oil grooves 6 are provided on the four inner walls of the pocket 2. Specifically, in this example, two second oil grooves 6 are provided on each inner wall of the pocket 2, and the second oil grooves 6 are provided through the thickness direction of the retaining frame body 1. The purpose of providing the second oil grooves 6 is mainly to store lubricating oil or grease, thereby reducing the friction between the rolling element and the inner wall of the pocket 2.

[0031] The four inner walls of the pocket 2, as well as the inner and outer walls of the retainer body 1, are all coated with a laser cladding layer 7. In this example, the laser cladding layer 7 is an aluminum-bronze cladding layer with a thickness of 0.3mm-0.4mm. Laser cladding is an advanced surface treatment technology that uses a high-energy-density laser beam to rapidly melt an alloy with different composition and properties into the substrate surface. The cladding material is then added to the substrate surface, forming a rapidly solidified alloy layer with a completely different composition and properties from the substrate. The purpose of this process is to allow the aluminum-bronze laser cladding layer 7 to come into contact with the bearing rings and rolling elements during the cage's operation, reducing damage to the bearing rings and rolling elements while also protecting the retainer body 1 from damage due to excessive friction.

[0032] The upper and lower surfaces of the retainer body 1 are both provided with outwardly protruding legs 3, which can reduce the contact area between the retainer and the raceway surface when the retainer moves in the raceway, thereby playing a role in reducing friction. Figure 1 As shown, there are eight supporting legs 3 , which are respectively arranged at the four corners of the upper and lower surfaces of the retainer body 1 .

[0033] The upper and lower positions of the inner and outer walls of the retainer body 1 are provided with chamfers 8, such as Figure 3 As shown, the chamfer 8 can reduce the contact area between the inner and outer walls of the retainer body 1 and the bearing ring, thereby achieving a friction-reducing effect.

[0034] Example 2

[0035] like Figure 4 As shown, the difference between this embodiment and the above embodiment is that there are 16 supporting legs 3 on the retaining frame body 1, that is, supporting legs 3 are provided at the four corners of the upper and lower surfaces of each pocket 2, which can improve the stability of movement during operation.

[0036] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A high-strength, low-friction wind turbine independent pitch bearing cage, characterized by: It includes a retainer body, which is a metal arc-shaped block structure. A first oil groove is provided on the inner and outer walls of the retainer body; a plurality of through pockets are opened in the thickness direction of the retainer body for accommodating rolling bodies, and a protrusion protruding toward the center of the pocket is provided on the inner wall of the pocket near the end of the rolling body, and a second oil groove is provided on the four inner walls of the pocket; the four inner walls of the pocket, as well as the inner and outer walls of the retainer body are provided with a laser cladding layer.

2. A high-strength, low-friction wind turbine independent pitch bearing retainer according to claim 1, characterized in that: The cage body is made of low carbon steel.

3. The high-strength, low-friction wind turbine independent pitch bearing retainer according to claim 1, characterized in that: The upper and lower surfaces of the retaining frame body are both provided with outwardly protruding supporting feet.

4. The high-strength, low-friction wind turbine independent pitch bearing retainer according to claim 1, characterized in that: Chamfers are provided at upper and lower positions of the inner and outer walls of the retainer body.

5. The high-strength, low-friction wind turbine independent pitch bearing retainer according to claim 1, characterized in that: There are three pockets on the cage body.

6. The high-strength, low-friction wind turbine independent pitch bearing retainer according to claim 1, characterized in that: The laser cladding layer is an aluminum bronze cladding layer with a thickness of 0.3mm-0.4mm.

7. The high-strength, low-friction wind turbine independent pitch bearing retainer according to claim 1, characterized in that: There are two second oil grooves on each inner wall of the pocket.

8. The high-strength, low-friction wind turbine independent pitch bearing retainer according to claim 1, characterized in that: The second oil groove is provided through the retainer body in a thickness direction.

9. The high-strength, low-friction wind turbine independent pitch bearing retainer according to claim 1, characterized in that: The first oil groove passes through both ends of the retainer body.

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