Inner assembly hot mounting tool for machine-made retainer tapered roller bearing of wind driven generator

Abstract

This invention relates to the field of bearing assembly technology, specifically to a heat-fitting fixture for the inner components of a machine-cage tapered roller bearing for wind turbine generators. The fixture includes a machine-cage support platform, a roller support platform, and a heat storage platform. The roller support platform is arranged on the upper surface of the machine-cage support platform, and the heat storage platform is arranged on the circumferential outer side of the machine-cage support platform. The roller support platform is cylindrical, and its upper surface is conical. The angle between the generatrix of the conical surface and the horizontal plane is the same as the small end face assembly angle when the roller is assembled with its small end facing downwards. The projection of the outer contour of the upper surface of the heat storage platform onto the horizontal plane includes or coincides with the projection of the outer assembly circle of the large end of the roller onto the horizontal plane. This invention uses the heat storage platform to heat the machine-cage before the roller is installed, preventing the machine-cage from cooling down rapidly and shrinking in diameter, thus ensuring that the inner ring can be installed.

Description

Technical Field

[0001] This invention relates to the field of bearing assembly technology, and more specifically to a heat-fitting fixture for the internal components of a machine-cage tapered roller bearing for wind turbine generators. Background Technology

[0002] As wind turbine power increases, the load on the main bearing also increases, leading to larger bearing sizes. Due to space constraints in the nacelle, large-megawatt wind turbine main bearings often employ single-row tapered roller bearings with a machine-made cage structure. The inner diameter of wind turbine main bearings is typically greater than 1500mm, and a single bearing set can weigh several tons, with the raceway weighing hundreds to several tons. Assembly presents the following challenges: 1. To ensure the rollers and machine-made cage do not separate from the inner ring when the small end of the inner component faces downwards, the diameter at the intersection of the inner ring's small flange and outer diameter is larger than the assembly circle diameter of the chamfered inner diameter side of the roller after assembly with the machine-made cage. The inner ring cannot be installed at room temperature and can only be heat-installed by heating the machine-made cage; 2. Due to the high hoisting costs of high-power wind turbines and the requirement for a bearing life of at least 20 years, the inner ring cannot be press-fitted or skid-fitted during assembly of the inner components. Furthermore, to prevent deformation of the mechanical cage during assembly, it is not allowed to bear any force other than its own weight; 3. The mechanical cage has a thin wall thickness (10mm~14mm) and a large diameter (inner diameter>1500mm). Most of it is pockets, resulting in less solid metal. After heating, the mechanical cage stores little heat and is prone to cooling and shrinkage, resulting in insufficient thermal expansion and the bearing inner ring cannot be installed; 4. There are nearly a hundred rollers, and the inner ring weighs several hundred kilograms, requiring lifting machinery for hoisting. This results in a long assembly time for internal components, and the mechanical cage suffers from significant heat loss and large temperature differences during assembly, making it easy to have insufficient expansion.

[0003] Most existing methods for assembling internal components of tapered roller bearings involve pressing down on the inner ring of the bearing, squeezing the chamfered portion of the small end of the roller to move radially, causing the mechanical cage to undergo radial elastic deformation before being installed into the inner ring. These methods are not suitable for high-requirement wind turbine main shaft bearings. Summary of the Invention

[0004] To address the aforementioned problems, this invention proposes a heat-fitting fixture for the internal components of a mechanically caged tapered roller bearing for wind turbine generators. The specific technical solution is as follows: A heat-fitting fixture for the internal components of a machine-cage tapered roller bearing for wind turbine generators includes a machine-cage support platform, a roller support platform, and a heat storage platform. The roller support platform is arranged on the upper surface of the machine-cage support platform, and the heat storage platform is arranged on the circumferential outer side of the machine-cage support platform. The roller support platform is cylindrical, and its upper surface is conical. The angle between the generatrix of the conical surface and the horizontal plane is the same as the small end face assembly angle when the roller is assembled with its small end facing downwards. The projection of the outer contour of the upper surface of the heat storage platform of the machine-cage onto the horizontal plane includes or coincides with the projection of the outer assembly circle of the large end of the roller onto the horizontal plane. During heat fitting, the machine-cage is placed on the machine-cage support platform and both are heated to a predetermined temperature. Then, it is transported to the assembly area, the machine-cage is lifted, and the small end face of the tapered roller contacts the conical surface of the roller support platform and slides into the machine-cage pocket. Finally, the machine-cage is lifted by the tapered roller.

[0005] Furthermore, the upper surface of the thermal storage platform and the upper surface of the mechanism retainer support platform are on the same horizontal plane.

[0006] Furthermore, the outer diameter of the roller support platform is smaller than the inner diameter of the small end of the mechanism cage, with a difference of 5mm.

[0007] Furthermore, the exterior of the thermal storage platform is cylindrical.

[0008] Furthermore, the inner diameter of the roller support platform is larger than the diameter at the intersection of the inner ring small flange and the outer diameter, with a difference of 4mm.

[0009] Furthermore, after the mechanism retainer is lifted by the tapered rollers, the distance between the lower surface of the mechanism retainer and the upper surface of the mechanism retainer support platform is 5mm.

[0010] The beneficial effects of this invention are as follows: The heat storage platform replenishes the temperature of the retainer before the rollers are installed, preventing the retainer from cooling down rapidly and shrinking in diameter. The angle between the generatrix of the conical surface of the roller support platform and the horizontal plane is the same as the assembly angle of the small end face when the roller is assembled with its small end facing downwards. This allows the small end face of the roller to contact the conical surface of the roller support platform and adjust its posture to the assembly state before entering the retainer pocket, ensuring a smooth roller entry process. In addition, the roller support platform ensures that the retainer is not subjected to external forces during the internal component assembly process. Attached Figure Description

[0011] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0012] Figure 1 This is a schematic diagram of the structure of the cage tapered roller bearing described in this invention; Figure 2 This is a schematic diagram of the structure of the bearing internal assembly described in this invention; Figure 3 This is a schematic diagram of the assembly of the tapered roller and the mechanical cage described in this invention; Figure 4 This is a schematic diagram of the internal component heat fitting tooling described in this invention; Figure 5 This is a schematic diagram of the operation of the internal component heat fitting tooling described in this invention.

[0013] In the diagram: 1. Outer ring; 2. Tapered roller; 3. Machine-made cage; 4. Inner ring; 5. Heat storage platform; 6. Machine-made cage support platform; 7. Roller support platform. Detailed Implementation

[0014] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0015] The present invention provides the following specific implementation schemes: like Figure 1-5As shown, this invention provides a heat-fitting fixture for the inner components of a machine-cage tapered roller bearing for wind turbine generators. The machine-cage tapered roller bearing includes an outer ring 1, tapered rollers 2, a machine-cage 3, and an inner ring 4. The heat-fitting fixture includes a machine-cage support platform 6, a roller support platform 7, and a heat storage platform 5. The roller support platform 7 is arranged on the upper surface of the machine-cage support platform 6, and the heat storage platform 5 is arranged on the circumferential outer side of the machine-cage support platform 6. The roller support platform 7 is cylindrical, and its upper surface is a conical surface. The angle α between the generatrix of the conical surface and the horizontal plane is the same as the small end face assembly angle β when the small end of the tapered roller 2 is facing downwards after assembly, thereby ensuring... The tapered roller 2 is inserted smoothly into the pocket of the machine retainer 3. The projection of the outer contour of the upper surface of the heat storage platform 5 of the machine retainer on the horizontal plane includes or coincides with the projection of the outer side of the large end of the tapered roller 2 after assembly on the horizontal plane, thereby ensuring that sufficient heat can be stored. In this embodiment, the hot fitting fixture is made of forging. During hot fitting, the machine retainer 3 is placed on the machine retainer support platform 6 and both are heated to a predetermined temperature. Then, it is transported to the assembly area, and the machine retainer is slightly lifted so that the small end face of the tapered roller 2 contacts the conical surface of the roller support platform 7 and slides into the pocket of the machine retainer 3. Finally, the machine retainer 3 is lifted by the tapered roller 2.

[0016] Furthermore, the upper surface of the thermal storage platform 5 and the upper surface of the mechanism retainer support platform 6 are on the same horizontal plane, thereby ensuring that the radial expansion of the mechanism retainer during heating is not interfered with.

[0017] Furthermore, the outer diameter d5 of the roller support platform 7 is smaller than the inner diameter d3 of the small end of the mechanism cage. In this embodiment, in order to ensure that the roller has sufficient support width for the small end face of the roller after the roller is placed on the conical surface, the difference between the outer diameter d5 of the roller support platform 7 and the inner diameter d3 of the small end of the mechanism cage 3 is 5mm, that is, d3-d5=5mm.

[0018] Furthermore, the outer surface of the thermal storage platform 5 is cylindrical. In this embodiment, the outer diameter d7 of the thermal storage platform 5 is the same as the diameter of the outer assembly circle d4 of the large end of the assembled tapered roller 2.

[0019] Furthermore, the inner diameter d6 of the roller support platform 7 is greater than the diameter d1 at the intersection of the small flange of the inner ring 4 and the outer diameter. In order to ensure that the hot fitting fixture does not interfere when the inner ring 4 is installed, in this embodiment, the difference between the inner diameter of the roller support platform 7 and the diameter at the intersection of the small flange of the inner ring 4 and the outer diameter is 4mm, that is, d6-d1=4mm.

[0020] Furthermore, after the mechanism retainer 3 is lifted by the tapered roller 2, the distance between the lower surface of the mechanism retainer 3 and the upper surface of the mechanism retainer support platform 6 is 5mm.

[0021] Furthermore, the conical edge of the roller support platform 7 is chamfered to prevent scratches on the rollers or workers.

[0022] In this embodiment, the heat storage platform 5 provides additional heat to the mechanical cage before the rollers are installed, preventing rapid cooling of the mechanical cage from causing diameter shrinkage. This ensures that the assembly circle diameter d2 on the inner diameter side of the chamfered side of the roller's small end is larger than the outer diameter d1 of the inner ring small flange after assembly, allowing the inner ring small flange to fit into the assembly circle on the inner diameter side of the chamfered side of the roller's small end without colliding with the roller. The angle α between the conical surface of the roller support platform 7 and the horizontal plane is the same as the assembly angle β of the small end face when the roller is assembled with its small end facing downwards. This allows the roller's small end face to contact the conical surface of the roller support platform 7 before entering the pocket of the mechanical cage and adjust its posture to the assembly state, ensuring a smooth process for the roller to enter the pocket. In addition, the roller support platform 7 ensures that the mechanical cage is not subjected to external forces during the assembly of internal components.

[0023] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed invention.

Claims

1. A heat-fitting fixture for the internal components of a machine-cage tapered roller bearing for wind turbine generators, characterized in that: The system includes a mechanical cage support platform, a roller support platform, and a heat storage platform. The roller support platform is located on the upper surface of the mechanical cage support platform, and the heat storage platform is located on the circumferential outer side of the mechanical cage support platform. The roller support platform is cylindrical, and its upper surface is conical. The angle between the generatrix of the conical surface and the horizontal plane is the same as the small end face assembly angle when the roller is assembled with its small end facing downwards. The projection of the outer contour of the upper surface of the mechanical cage heat storage platform onto the horizontal plane includes or coincides with the projection of the outer assembly circle of the large end of the roller onto the horizontal plane. During hot assembly, the mechanical cage is placed on the mechanical cage support platform and both are heated to a predetermined temperature. Then, it is transported to the assembly area, the mechanical cage is lifted, and the small end face of the tapered roller contacts the conical surface of the roller support platform and slides into the pocket of the mechanical cage. Finally, the mechanical cage is lifted up by the tapered roller.

2. The internal component heat fitting for a machine-cage tapered roller bearing for wind turbine generators according to claim 1, characterized in that: The upper surface of the thermal storage platform and the upper surface of the mechanism retainer support platform are on the same horizontal plane.

3. The internal component heat fitting for a machine-cage tapered roller bearing for wind turbine generators according to claim 1, characterized in that: The outer diameter of the roller support platform is smaller than the inner diameter of the small end of the mechanical cage by 5 mm.

4. The internal component heat fitting for a machine-cage tapered roller bearing for wind turbine generators according to claim 1, characterized in that: The exterior of the thermal storage platform is cylindrical.

5. The internal component heat fitting for a machine-cage tapered roller bearing for wind turbine generators according to claim 1, characterized in that: The inner diameter of the roller support platform is larger than the diameter at the intersection of the inner ring small flange and the outer diameter, with a difference of 4mm.

6. The internal component heat fitting for a machine-cage tapered roller bearing for wind turbine generators according to claim 1, characterized in that: After the cage is lifted by the tapered rollers, the distance between the lower surface of the cage and the upper surface of the cage support platform is 5mm.

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