Main gear box bearing and manufacturing method

Abstract

The invention relates to the field of bearings, and discloses a main gearbox bearing and a manufacturing method thereof.The main gearbox bearing comprises a bearing body, a clamping groove is formed in the outer side of the bearing body, and the section of the clamping groove is in a triangular design; the positioning pin is composed of a pin rod and a spring, the positioning pin is arranged in a pin hole formed in the inner wall of the bearing hole of the end cover, the pin rod is located at the outer end of the pin hole, and the spring is located in the pin hole. The clamping groove is formed in the side face of the bearing body to be matched with the positioning pin, and compared with a traditional outer ring center fixing mode, overhauling, troubleshooting and disassembling are convenient; the clamping grooves are formed in the side faces and staggered with the balls, the bearing capacity and rigidity of the bearing can be guaranteed, and the fracture risk is reduced. Meanwhile, two machining modes are adopted according to different requirements, namely, three-groove design is adopted for integral forming machining, so that the overall structure is firm, and secondary machining is not needed; in machining, a single groove is formed through secondary cutting, limiting and fixing can be achieved, and the bearing capacity and rigidity can be kept.

Description

Technical Field

[0001] The present invention relates to the field of bearings, and in particular to a main gearbox bearing and a manufacturing method thereof. Background Art

[0002] In recent years, many problems have been found in wind farm gearboxes during inspections during wind turbine operation. From the inspection of the entire wind farm, the main problems are:

[0003] The above phenomena of output stage bearing running and bearing wear (including intermediate stage rear bearing running and high-speed shaft front bearing running) all belong to various stages of tooth surface off-load pitting caused by high-speed shaft bearing running. It can be foreseen that if the above problems are not dealt with in a timely manner, they will continue to develop over time, and will most likely lead to broken teeth and failure of the high-speed gear pair. The broken iron filings, residues or larger tooth blocks will become a source of risk, affecting the operation of the gearbox, and even causing a series of more serious consequences such as low-speed stage and planetary stage failures, which will pose a safety hazard and bottleneck to the safe and stable operation of new energy wind power generation in the later stage.

[0004] Since the high-speed shaft front bearing and the gearbox are not interference fitted, during the long-term operation of the gearbox, the high-speed shaft front bearing will slide relative to the gearbox bearing hole. When the relative sliding exists for a long time, the bearing hole will wear out. The result is that the gear shaft runs eccentrically and the tooth surface is overloaded. The part of the tooth surface that is in contact after the overload carries the entire torque, and the contact stress of the tooth surface exceeds the design strength. The tooth surface will wear, pit, or even peel off and break in a short period of time, causing the gearbox to fail.

[0005] Currently, some bearings use a central hole in the outer ring with a pin for positional fixation. However, this method significantly compromises the bearing's overall structural integrity, resulting in a very thin gap between the outer ring and the ball bearings. This not only reduces the bearing's load capacity and rigidity, thus shortening its service life, but also increases the risk of fracture during use due to structural weakness. Summary of the Invention

[0006] Therefore, the technical problem to be solved by this invention is that some bearings currently use a central hole in the outer ring with a pin for positional fixation. However, this hole significantly compromises the overall structural integrity of the bearing, resulting in a very thin gap between the outer ring and the ball bearing. This not only reduces the bearing's load capacity and rigidity, thereby shortening its service life, but also increases the risk of breakage during use due to structural weakness.

[0007] The above technical problems are solved by the following technical solutions: The present invention proposes a main gearbox bearing, which includes:

[0008] A bearing body, wherein a slot is provided on the outer side of the bearing body, and the cross section of the slot is triangular;

[0009] The positioning pin is composed of a pin rod and a spring. The positioning pin is arranged in a pin hole opened on the inner wall of the end cover bearing hole, and the pin rod is located at the outer end of the pin hole, and the spring is located inside the pin hole.

[0010] In a preferred embodiment of the main gearbox bearing of the present invention: the slot consists of an inner surface and side surfaces arranged on both sides of the inner surface, the inner surface is inclined, and the two groups of side surfaces are serrated as a whole.

[0011] In a preferred embodiment of the main gearbox bearing of the present invention: the side surface is fixedly connected to an outer strip, and the side surface is provided with a groove;

[0012] The width of the outer strips is the same as the width of the grooves, and the outer strips and the grooves are designed alternately.

[0013] In a preferred embodiment of the main gearbox bearing of the present invention, the pin rod comprises a short rod and a pin head fixedly connected to the top end of the short rod, the pin head is triangular in design, and the inclined surface of the pin head has the same inclination angle as the inner surface;

[0014] Wherein, the bottom end of the short rod is fixedly connected to the spring.

[0015] In a preferred embodiment of the main gearbox bearing of the present invention: convex strips are fixedly connected to both sides of the pin head, and inner grooves are formed on both sides of the pin head;

[0016] The width of the convex strips is the same as the width of the inner grooves, and the convex strips and the inner grooves are designed alternately.

[0017] In a preferred embodiment of the main gearbox bearing of the present invention, the outer strip cooperates with the inner groove, and the convex strip cooperates with the concave groove.

[0018] The present invention also provides a manufacturing method, including the main gearbox bearing, and further comprising the following processing methods:

[0019] One-piece processing and machining;

[0020] Different numbers of slots are designed according to different bearing processing methods;

[0021] If integrated processing is adopted, the number of slots is set to three groups and evenly spaced;

[0022] If machining is adopted, the number of slots is set as one group.

[0023] In a preferred embodiment of the manufacturing method of the present invention: an integrated processing method, that is, a bearing with a slotted structure is directly manufactured through a casting process of pouring, forging or integrated molding.

[0024] In a preferred embodiment of the manufacturing method of the present invention: the mechanical processing method is to gradually manufacture the bearing through a cutting process, and groove the outer ring during the processing.

[0025] In a preferred embodiment of the manufacturing method of the present invention, conventionally processed bearings are subjected to secondary processing by mechanical processing for use.

[0026] The beneficial effects of this invention are as follows: by providing a slot on the side of the bearing body that cooperates with the locating pin, it facilitates inspection, troubleshooting, and disassembly compared to the traditional outer ring center fixing method. The slot is located on the side and offset from the ball, which ensures the bearing's load capacity and rigidity, reducing the risk of fracture. At the same time, two processing methods are adopted according to different needs: one-piece molding uses a three-slot design to ensure a solid overall structure and eliminate the need for secondary processing; mechanical processing uses a single slot through secondary cutting, which achieves limited fixation while maintaining load capacity and rigidity, and facilitates the modification of traditional bearings. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings of the embodiments of the present invention. Obviously, the drawings described below only relate to some embodiments of the present invention, and are not intended to limit the present invention.

[0028] Figure 1 Shown is an overall installation diagram of the present invention.

[0029] Figure 2 A schematic cross-sectional view of a bearing according to the present invention is shown.

[0030] Figure 3 A schematic diagram of a single groove in a bearing of the present invention is shown.

[0031] Figure 4 A schematic diagram of a bearing according to the present invention with three grooves is shown.

[0032] Figure 5 A partial cross-sectional schematic diagram of the present invention is shown.

[0033] Figure 6 Shown is an overall schematic diagram of the positioning pin of the present invention. DETAILED DESCRIPTION

[0034] In order to enable those skilled in the art to better understand the present invention, the present invention is further described in detail below with reference to specific embodiments and the accompanying drawings.

[0035] The terms used in the present invention are those commonly used in the art in view of the functions of the present invention, but these terms may vary according to the intentions of those skilled in the art, precedents, or new technologies in the art. In addition, specific terms may be selected by the applicant, and in such cases, their detailed meanings will be described in the detailed description of the present invention. Therefore, the terms used in the specification should not be understood as simple names, but rather as the meanings of the terms and the overall description of the present invention.

[0036] Reference Figures 1 to 4 , this embodiment provides a main gearbox bearing, including,

[0037] The bearing body 1 has a slot 11 on its outer side, and the slot 11 has a triangular cross-section.

[0038] The positioning pin 2 is composed of a pin rod 21 and a spring 22. The positioning pin 2 is set in a pin hole opened on the inner wall of the end cover bearing hole, and the pin rod 21 is located at the outer end of the pin hole, and the spring 22 is located inside the pin hole.

[0039] When the bearing body 1 needs to be installed, the locating pin 2 needs to be installed in the pin hole opened on the inner wall of the bearing hole of the end cover first, and then the end of the bearing body 1 with the slot 11 is installed in the direction of the locating pin 2. At the same time, the operator presses the pin rod 21, and it is completely retracted into the pin hole under the elasticity of the spring 22. When the bearing body 1 is installed to the specified position, the pin rod 21 is released at this time, and the pin rod 21 is completely inserted into the inside of the slot 11 under the elasticity of the spring 22, thereby completing the fixation of the bearing body 1.

[0040] Compared to the traditional method of fixing the bearing body 1 at the center of the outer ring, this installation and positioning method facilitates inspection and troubleshooting of the bearing body 1 after limiting and fixing the bearing body 1. This method only requires observing the matching relationship between the positioning pin 2 and the slot 11. This method also facilitates disassembly. The operator simply inserts an insert into the gap between the positioning pin 2 and the slot 11, presses the positioning pin 2, and then moves the bearing body 1.

[0041] By opening the slot 11 on the side of the bearing body 1 and ensuring that it is completely misaligned with the ball, the wall thickness of the roller and the outer ring can be guaranteed, thereby ensuring the load-bearing capacity and rigidity of the bearing and avoiding the risk of increased breakage due to weak structure during use.

[0042] As an example provided, Figure 5 The card slot 11 is composed of an inner surface 111 and side surfaces 112 arranged on both sides of the inner surface 111. The inner surface 111 is inclined, and the two sets of side surfaces 112 are serrated as a whole.

[0043] The inclined design of the inner surface 111 can ensure that the structural damage between the opening of the slot 11 and the roller is minimized, further ensuring the load-bearing capacity and rigidity of the bearing.

[0044] As an example provided, Figures 1 to 6 , the side surface 112 is fixedly connected with an outer strip 1121, and the side surface 112 is provided with a groove 1122;

[0045] The width of the outer strip 1121 and the groove width of the groove 1122 are the same, and the outer strip 1121 and the groove 1122 are designed alternately.

[0046] The pin rod 21 is composed of a short rod 211 and a pin head 212 fixedly connected to the top of the short rod 211. The pin head 212 is triangular in design, and the inclined surface of the pin head 212 has the same inclination angle as the inner surface 111.

[0047] The bottom end of the short rod 211 is fixedly connected to the spring 22 .

[0048] The two sides of the pin head 212 are fixedly connected with ridges 2121, and the two sides of the pin head 212 are provided with inner grooves 2122;

[0049] The width of the protruding strips 2121 is the same as the width of the inner grooves 2122 , and the protruding strips 2121 and the inner grooves 2122 are designed alternately.

[0050] The outer strip 1121 matches the inner groove 2122 , and the protruding strip 2121 matches the recess 1122 .

[0051] When the pin head 212 is engaged with the slot 11, the outer strip 1121 is engaged with the inner slot 2122, and the convex strip 2121 is engaged with the concave groove 1122, thereby fully limiting the bearing body 1, avoiding axial and circumferential deviation, and ensuring its stability after overall limiting installation.

[0052] As an example provided, Figures 1 to 6 , a manufacturing method, including a main gearbox bearing, further comprising the following processing methods,

[0053] One-piece processing and machining;

[0054] Different numbers of slots are designed according to different bearing processing methods;

[0055] If integrated processing is adopted, the number of slots is set to three groups and evenly spaced;

[0056] If machining is adopted, the number of slots is set as one group.

[0057] The one-piece processing method is to directly produce a bearing with a slotted structure through casting, forging or one-piece molding.

[0058] The mechanical processing method is to manufacture the bearing step by step through the cutting process, and groove the outer ring during the processing.

[0059] For traditionally processed bearings, secondary processing is performed by mechanical processing before they can be used.

[0060] The two different processing methods offer different applications. The three evenly spaced slots provide a more secure positioning of the bearing. The one-piece molding method provides a strong overall bearing structure, eliminating the need for secondary cutting and slotting, thus ensuring the bearing's load capacity and rigidity. While mechanical processing requires secondary cutting and slotting, a single slot method achieves both positional positioning and guaranteed load capacity and rigidity.

[0061] At the same time, it is easier to machine a single groove in a traditional bearing while ensuring the load-bearing capacity and rigidity of the traditional bearing.

[0062] Finally, it should be pointed out that the methods and devices described in detail above are merely embodiments, and those skilled in the art can modify these embodiments in different ways without departing from the scope of the present invention.

Claims

1. A main gearbox bearing, characterized in that: include, A bearing body (1), wherein a slot (11) is provided on the outer side of the bearing body (1), and the slot (11) has a triangular cross-section; A positioning pin (2) is composed of a pin rod (21) and a spring (22). The positioning pin (2) is arranged in a pin hole provided on the inner wall of the end cover bearing hole, and the pin rod (21) is located at the outer end of the pin hole, and the spring (22) is located inside the pin hole.

2. The main gearbox bearing according to claim 1, characterized in that: The card slot (11) consists of an inner surface (111) and side surfaces (112) arranged on both sides of the inner surface (111); the inner surface (111) is designed to be inclined, and the two groups of side surfaces (112) are designed to be sawtooth-shaped as a whole.

3. The main gearbox bearing according to claim 2, characterized in that: The side surface (112) is fixedly connected with an outer strip (1121), and the side surface (112) is provided with a groove (1122); The width of the outer strip (1121) and the groove width of the groove (1122) are the same, and the outer strip (1121) and the groove (1122) are designed alternately in sequence.

4. The main gearbox bearing according to claim 3, characterized in that: The pin rod (21) is composed of a short rod (211) and a pin head (212) fixedly connected to the top end of the short rod (211); the pin head (212) is triangular in design, and the inclined surface of the pin head (212) has the same inclination angle as the inner surface (111); Wherein, the bottom end of the short rod (211) is fixedly connected to the spring (22).

5. The main gearbox bearing according to claim 4, characterized in that: Both sides of the pin head (212) are fixedly connected with convex strips (2121), and both sides of the pin head (212) are provided with inner grooves (2122); The width of the convex strips (2121) is the same as the width of the inner grooves (2122), and the convex strips (2121) and the inner grooves (2122) are designed alternately.

6. The main gearbox bearing according to claim 5, characterized in that: The outer strip (1121) cooperates with the inner groove (2122), and the convex strip (2121) cooperates with the concave groove (1122).

7. A production method, characterized in that: The main gearbox bearing according to any one of claims 1 to 6 further comprises the following processing method: One-piece processing and machining; Different numbers of slots are designed according to different bearing processing methods; If integrated processing is adopted, the number of slots is set to three groups and evenly spaced; If machining is adopted, the number of slots is set as one group.

8. The production method according to claim 7, characterized in that: The one-piece processing method is to directly produce a bearing with a slotted structure through casting, forging or one-piece molding.

9. The production method according to claim 8, characterized in that: The mechanical processing method is to manufacture the bearing step by step through the cutting process, and groove the outer ring during the processing.

10. The production method according to claim 9, characterized in that: For traditionally processed bearings, secondary processing is performed by mechanical processing before they can be used.

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