Cylindrical roller bearing

Abstract

The invention discloses a cylindrical roller bearing, which relates to the field of wind power generation and comprises a bearing frame assembly. The projection shape of the peripheral face of the roller in the axis direction is an arc line, and the roller is used for decomposing vertical impact force acting on the roller into tangential component force along a curved surface, the capacity of the roller for bearing static loads and dynamic loads is enhanced, and stress concentration in the running process is avoided. The multiple rollers are arranged on the bearing frame assembly, and the multiple rollers can decompose the force acting on the bearing, so that the overall dynamic load and static load bearing capacity of the bearing is improved, and the strength of the rollers is improved. The arc-shaped curved surface formed by the roller can decompose vertical impact force into tangential component force along the curved surface, kinetic energy is converted into heat energy or elastic potential energy through elastic deformation of a material, and direct transmission of stress waves is reduced; the arc-shaped structure generates nonlinear deformation under a dynamic load, and the damping ratio of the structure is increased.

Description

Technical Field

[0001] The present invention relates to the field of wind power generation, and in particular to a cylindrical roller bearing. Background Art

[0002] The pitch bearing is a key component of a wind turbine. The inner ring of the pitch bearing has teeth on its inner wall. The gears on the drive unit and its output end work together to drive the inner ring of the pitch bearing to rotate, thereby adjusting the blade angle. The windward angle of the connected blades is adjusted according to the wind speed, controlling the blade output power and ensuring blade safety. Its performance directly determines the reliability and stability of the wind turbine. The performance of the pitch bearing is determined by its lubrication system. This lubrication system ensures the reliable performance of the pitch bearing by continuously and steadily injecting lubricating grease into the raceway between the inner and outer rings of the pitch bearing, keeping the cylindrical rollers or ball rollers inside the pitch bearing lubricated.

[0003] The existing variable pitch bearings are subjected to large dynamic and static loads during the adjustment process, which can easily cause damage to the rollers. Summary of the Invention

[0004] Therefore, the technical problem to be solved by the present invention is that the existing bearings are subjected to large dynamic loads and static loads, and the rollers are easily damaged.

[0005] The above technical problem is solved by the following technical solution: The present invention proposes a cylindrical roller bearing, which includes a bearing frame assembly.

[0006] The roller has an outer peripheral surface projected in an arc shape along the axial direction, which is used to decompose the vertical impact force acting on the roller into a tangential component along the curved surface, thereby enhancing the roller's ability to withstand static and dynamic loads and avoiding stress concentration during operation.

[0007] By arranging a plurality of the rollers on the bearing frame assembly, the plurality of rollers can decompose the force acting on the bearing, thereby improving the overall ability of the bearing to withstand dynamic loads and static loads and improving the strength of the rollers.

[0008] In a preferred embodiment of the cylindrical roller bearing of the present invention, a hollow hole is provided inside the roller to save material and reduce weight.

[0009] In a preferred embodiment of the cylindrical roller bearing of the present invention, the projection of the hollow hole along the axial direction is the same as the arc line, so that the cross-section shape of the roller along the axial direction is arched.

[0010] In a preferred embodiment of the cylindrical roller bearing of the present invention, an annular groove is provided on the outer circumferential surface of the roller.

[0011] In a preferred embodiment of the cylindrical roller bearing of the present invention, a thread groove is provided on the outer circumferential surface of the roller.

[0012] In a preferred embodiment of the cylindrical roller bearing of the present invention, it also includes a support portion, which includes two support rods arranged side by side in the hollow hole, a connecting rod arranged on the two support rods, and a support frame arranged on the support rods and the connecting rods.

[0013] In a preferred embodiment of the cylindrical roller bearing described in the present invention: the bearing frame assembly includes a bearing outer ring, a bearing inner ring arranged on the inner side of the bearing outer ring and coaxial with the bearing outer ring, and a mounting frame arranged between the bearing outer ring and the bearing inner ring and used to mount the roller, and the roller is slidably arranged on the bearing outer ring and the bearing inner ring.

[0014] In a preferred embodiment of the cylindrical roller bearing of the present invention, a first annular groove is provided on the inner circumferential surface of the outer ring of the bearing, and the bottom surface of the first annular groove is an arc surface and fits the arc line.

[0015] In a preferred embodiment of the cylindrical roller bearing of the present invention, a second annular groove is provided on the outer circumferential surface of the bearing inner ring, and the bottom surface of the second annular groove is an arc surface and fits the arc line.

[0016] In a preferred embodiment of the cylindrical roller bearing of the present invention, the mounting frame is provided with a plurality of mounting holes for mounting a plurality of the rollers, and the mounting holes have the same shape as the outer circumference of the rollers.

[0017] The beneficial effects of this invention are as follows: the curved surface formed by the roller decomposes vertical impact forces into tangential components along the surface, converting kinetic energy into thermal energy or elastic potential energy through elastic deformation of the material, thereby reducing the direct transmission of stress waves. The curved structure undergoes nonlinear deformation under dynamic loads, increasing the structural damping ratio. The curved raised area actively bears the load, reducing stress concentration in adjacent areas. The curved surface inhibits local or global buckling of the cylinder through geometric constraints. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] 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. Among them:

[0019] Figure 1 Shows a schematic diagram of the overall structure of the present invention;

[0020] Figure 2An exploded view of the present invention is shown;

[0021] Figure 3 shows a cross-sectional view of the outer ring of the bearing of the present invention;

[0022] Figure 4 A schematic diagram of the three-dimensional structure of the roller of the present invention is shown;

[0023] Figure 5 shows a cross-sectional view of the roller of the present invention;

[0024] Figure 6 Shows a planar cross-sectional view of the roller of the present invention;

[0025] Figure 7 Shows the structure of the roller of the present invention Figure 1 ;

[0026] Figure 8 Shows the structure of the roller of the present invention Figure 2 . DETAILED DESCRIPTION

[0027] 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.

[0028] 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.

[0029] Reference Figure 1 , this embodiment provides a cylindrical roller bearing, including a bearing frame assembly 1.

[0030] Roller 2, the projection shape of the outer peripheral surface of roller 2 along the axial direction is an arc 21, which is used to decompose the vertical impact force acting on roller 2 into a tangential component along the curved surface, enhance the ability of roller 2 to withstand static loads and dynamic loads, and avoid stress concentration during operation; by setting it into an arc 21, that is, the arc-shaped curved surface formed by roller 2 can decompose the vertical impact force into a tangential component along the curved surface (such as the convex part of the wavy outer periphery), and convert kinetic energy into thermal energy or elastic potential energy through elastic deformation of the material, thereby reducing the direct transmission of stress waves; the arc-shaped structure produces nonlinear deformation under dynamic loads, increasing the structural damping ratio. The arc-shaped raised area can actively bear the load and reduce stress concentration in adjacent areas. For example, the segmented arc-shaped reinforcement ribs disperse the radial pressure of the cylinder to multiple arc-shaped support points, reducing the maximum stress by more than 40%. The arc-shaped curved surface suppresses the local or overall buckling of the cylinder through geometric constraints; increases the contact area with the bearing frame assembly 1, so that the area through which the lubricating oil passes is larger, improving the lubrication effect, and the increased area is conducive to heat dissipation. The direction along the axis is Figure 4 The X-axis direction in .

[0031] By arranging a plurality of rollers 2 on the bearing frame assembly 1 , the plurality of rollers 2 can decompose the forces acting on the bearing, thereby improving the overall ability of the bearing to withstand dynamic and static loads and improving the strength of the rollers 2 .

[0032] like Figure 6 As shown, the roller 2 is provided with a hollow hole 22 to save material and reduce weight. By providing the hollow hole 22, the material used for the roller 2 is reduced, the weight of the wind turbine nacelle and the hub load is reduced, and the development prospects of large wind turbines are established.

[0033] like Figure 6 As shown, the projection of the hollow hole 22 along the axis is the same as the arc 21, which is used to make the cross-section of the roller 2 along the axis into an arch shape. The arch structure converts the concentrated load into a component force along the curved surface through the curved surface, so that the stress is uniformly distributed instead of locally concentrated. For example, corrugated cardboard disperses the vertical pressure to multiple arch ribs through arched corrugations, reducing the stress per unit area and avoiding failure of the material due to local overload. Figure 4 The X-axis direction in .

[0034] like Figure 7 As shown, the outer circumference of the roller 2 is provided with an annular groove 23. The annular groove 23 can increase the storage of lubricating oil, so that the lubrication effect of the roller 2 is better, and at the same time, the heat dissipation area of the roller 2 can be increased, thereby improving the heat dissipation efficiency.

[0035] like Figure 8As shown, the outer circumference of the roller 2 is provided with a thread groove 24. The thread groove 24 can increase the storage of lubricating oil, and the lubricating oil can flow and communicate with each other, so that the lubrication effect of the roller 2 is better, and the heat dissipation area of the roller 2 can be increased, thereby improving the heat dissipation efficiency.

[0036] like Figure 5 As shown, the roller 2 further includes a support portion 3, which includes two support rods 31 arranged side by side in the hollow hole 22, a connecting rod 32 arranged on the two support rods 31, and a support frame 33 arranged on the support rods 31 and the connecting rod 32. The support portion 3 can further improve the strength of the roller 2.

[0037] like Figure 2 As shown, the bearing frame assembly 1 includes a bearing outer ring 11, a bearing inner ring 12 arranged on the inner side of the bearing outer ring 11 and coaxial with the bearing outer ring 11, and a mounting frame 13 arranged between the bearing outer ring 11 and the bearing inner ring 12 and used to mount the roller 2. The roller 2 is slidably set on the bearing outer ring 11 and the bearing inner ring 12.

[0038] like Figure 3 As shown in the figure, as an optional embodiment, a first annular groove 111 is provided on the inner circumference of the bearing outer ring 11. The bottom surface of the first annular groove 111 is an arc surface and aligns with the arc line 21. By aligning the first annular groove 111 with the arc line 21, the contact area of the roller 2 during rolling can be increased, making the installation of the roller 2 and the bearing outer ring 11 more stable, and also increasing the lubrication and heat dissipation area.

[0039] like Figure 2 As shown, a second annular groove 121 is provided on the outer circumference of the bearing inner ring 12. The bottom surface of the second annular groove 121 is an arc surface and aligns with the arc line 21. The alignment of the second annular groove 121 with the arc line 21 increases the contact area of the roller 2 during rolling, making the installation of the roller 2 and the bearing inner ring 12 more stable, while also increasing the lubrication and heat dissipation area.

[0040] like Figure 2 As shown, the mounting frame 13 is provided with a plurality of mounting holes 131 for mounting the plurality of rollers 2, and the mounting holes 131 have the same shape as the outer circumference of the rollers 2. The plurality of mounting holes 131 provided on the mounting frame 13 make the installation of the plurality of rollers 2 more stable.

[0041] In summary, the curved surface formed by roller 2 decomposes vertical impact forces into tangential components along the surface. This converts kinetic energy into thermal energy or elastic potential energy through elastic deformation of the material, reducing the direct transmission of stress waves. The curved structure undergoes nonlinear deformation under dynamic loads, increasing the structural damping ratio. The raised areas of the curved surface actively bear the load, reducing stress concentration in adjacent areas. The curved surface inhibits local or global buckling of the cylinder through geometric constraints. The increased contact area with the bearing frame assembly 1 allows the lubricant to pass through a larger area, improving lubrication effectiveness. The increased area also facilitates heat dissipation.

[0042] 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 cylindrical roller bearing, characterized in that: include, Bearing frame assembly (1); The roller (2) has an outer peripheral surface of the roller (2) projected in an axial direction in the shape of an arc (21), which is used to decompose a vertical impact force acting on the roller (2) into a tangential component along the curved surface, thereby enhancing the ability of the roller (2) to withstand static and dynamic loads and avoiding stress concentration during operation; By arranging a plurality of the rollers (2) on the bearing frame assembly (1), the plurality of rollers (2) can decompose the force acting on the bearing, thereby improving the overall bearing's ability to withstand dynamic and static loads and improving the strength of the rollers (2).

2. The cylindrical roller bearing according to claim 1, characterized in that: A hollow hole (22) is provided inside the roller (2) to save material and reduce weight.

3. The cylindrical roller bearing according to claim 2, characterized in that: The projection of the hollow hole (22) along the axial direction is the same as the arc line (21), so that the cross-sectional shape of the roller (2) along the axial direction is arched.

4. The cylindrical roller bearing according to claim 3, characterized in that: An annular groove (23) is provided on the outer peripheral surface of the roller (2).

5. The cylindrical roller bearing according to claim 3, characterized in that: The outer peripheral surface of the roller (2) is provided with a thread groove (24).

6. The cylindrical roller bearing according to any one of claims 4-5, characterized in that: The invention also includes a support portion (3), wherein the support portion (3) includes two support rods (31) arranged side by side in the hollow hole (22), a connecting rod (32) arranged on the two support rods (31), and a support frame (33) arranged on the support rods (31) and the connecting rod (32).

7. The cylindrical roller bearing according to claim 6, characterized in that: The bearing frame assembly (1) includes a bearing outer ring (11), a bearing inner ring (12) arranged on the inner side of the bearing outer ring (11) and coaxial with the bearing outer ring (11), and a mounting frame (13) arranged between the bearing outer ring (11) and the bearing inner ring (12) and used to mount the roller (2), and the roller (2) is slidably arranged on the bearing outer ring (11) and the bearing inner ring (12).

8. The cylindrical roller bearing according to claim 7, characterized in that: A first annular groove (111) is provided on the inner circumferential surface of the bearing outer ring (11); the bottom surface of the first annular groove (111) is an arc surface and fits the arc line (21).

9. The cylindrical roller bearing according to claim 8, characterized in that: A second annular groove (121) is provided on the outer peripheral surface of the bearing inner ring (12); the bottom surface of the second annular groove (121) is an arc surface and fits the arc line (21).

10. The cylindrical roller bearing according to claim 9, characterized in that: The mounting frame (13) is provided with a plurality of mounting holes (131) for mounting a plurality of the rollers (2), and the mounting holes (131) have the same shape as the outer peripheral surface of the rollers (2).

Images