Tapered roller bearing retainer with external supporting columns

Abstract

The retainer is arranged between an inner ring and an outer ring of a bearing, a tapered roller is retained between raceways of the inner ring and the outer ring of the bearing by the retainer, the retainer comprises the support, two ends of the support are connected onto an annular gasket, the support is arranged outside the tapered roller and is provided with a guide gap, and the tapered roller is arranged in the guide gap. One end of the supporting column is a threaded end, the other end of the supporting column is a welding end, the welding end of the supporting column is welded and fixed at the counter bore of the gasket on one side, the threaded end of the supporting column is connected with the gasket on the other side through threads, and the thread screwing direction of the supporting column is set as the screwing direction of the threads when the supporting column is subjected to rotating force; the strut is externally arranged on the outer side of the tapered roller, and the guide gap is formed between the strut and the tapered roller, so that the number of the tapered roller is arranged to the maximum extent, the bearing capacity of the bearing is improved, the defects caused in the bearing tapered roller machining and assembling process are avoided, and the strut stress condition is improved; and the operation reliability and the service life of the tapered roller bearing retainer are improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of bearing equipment manufacturing, and in particular relates to a column-external tapered roller bearing retainer. Background Art

[0002] The wind turbine main shaft bearing is an important component of the wind turbine. During the operation of the wind turbine, the stress condition of the wind wheel is extremely severe and it needs to operate continuously under rapidly changing loads. To ensure the stable operation of the wind turbine, the main shaft bearing plays a vital role. It is subjected to various complex working conditions transmitted to the main shaft by the blades. Therefore, it is different from ordinary bearings in design, manufacturing and maintenance and must ensure a service life of 20 years.

[0003] The bearing cage is the component that holds the rolling elements within the bearing and allows them to move with it, isolating and guiding them. Large rolling bearings typically use a pillar-type cage, with the pillar extending through the center hole of the roller and connected at each end to the cage's two washers. The need for an axial through-hole in the center of the roller increases the difficulty of machining and assembling the roller, making it prone to defects and assembly errors during assembly. The small clearance between the roller and the cage makes it difficult for grease to enter the roller's through-hole. Consequently, the contact between the center of the tapered roller and the pillar during operation creates significant friction, leading to abnormal operation, noise, and damage to the rolling elements and the inner and outer raceway raceways.

[0004] Tapered roller bearings are subject to large instantaneous impact loads during operation. In addition to the effects of rolling friction and centrifugal force, the friction between the rollers and the pillars drives the connection parts of the pillars and the cage washers to move relative to each other. The welding parts often cause the cage to open and break due to the load on the bearings, resulting in problems such as cage deformation, opening, and falling apart. Ultimately, the bearing components interfere with each other and damage the bearings, affecting the operating reliability and service life of the wind turbine main shaft bearings. Summary of the Invention

[0005] In order to solve the above technical problems, the utility model provides a column external tapered roller bearing retainer, in which the column is arranged outside the tapered roller and is provided with a guide gap, so as to maximize the number of tapered rollers, improve the bearing capacity of the bearing, avoid defects caused by the processing and assembly of the bearing tapered rollers, improve the stress condition of the column, and improve the operating reliability and service life of the tapered bearing retainer.

[0006] The technical solution adopted by the utility model is: a pillar-external tapered roller bearing retainer, the retainer is placed between the inner ring and the outer ring of the bearing, and the tapered roller is retained by the retainer between the raceways of the inner ring and the outer ring of the bearing, the retainer includes a pillar, both ends of the pillar are connected to the annular gasket, the pillar is placed outside the tapered roller and is provided with a guide gap, one end of the pillar is a threaded end, and the other end of the pillar is a welding end, the welding end of the pillar is welded and fixed at the countersunk hole of the gasket on one side, the threaded end of the pillar is connected to the gasket on the other side by a thread, and the thread rotation direction of the pillar is set to the tightening rotation direction of the thread when the retainer pillar of the bearing is subjected to rotational force.

[0007] The pillars are evenly distributed along the circumference of the annular washer, and the spacing between adjacent pillars is adapted to the axial outer diameter size of the tapered roller at 1 / 3 below the axial centerline. The tapered roller is embedded in the pocket formed by the washer and the pillars of the retainer. The outer diameters of adjacent tapered rollers at the centerline are close to each other, which can maximize the number of tapered rollers and improve the bearing capacity of the bearing.

[0008] The washer on one side of the retainer is evenly distributed along the circumference with truncated cone-shaped countersunk holes, and the welding end of the pillar passes through the washer and is welded and fixed at the countersunk hole; the washer on the other side of the retainer is evenly distributed along the circumference with threaded holes, and the positions of the threaded holes and the countersunk holes are adapted to each other.

[0009] The guide clearance between the support and the outer periphery of the tapered roller is 0.15-0.3 mm.

[0010] The pillar is made of medium carbon alloy steel, and the surface hardness of the pillar after high-frequency quenching treatment is ≥HRC55.

[0011] The pillar is placed outside the tapered roller and is provided with a guide gap. One end of the pillar is a threaded end and the other end is a welding end. The purpose of this arrangement is: the pillar is placed outside the tapered roller, which avoids the opening of an axial through hole in the center of the roller, reduces the difficulty of processing and assembling the roller, avoids the serious contact friction between the center of the tapered roller and the pillar when the bearing is working, and avoids problems such as abnormal operation of the bearing, noise and damage to the rolling element, thereby improving the operating reliability and service life of the tapered bearing cage.

[0012] The threaded end of the pillar is connected to the washer on the other side through a thread, and the thread rotation direction is opposite to the rotation direction of the inner ring of the bearing. The purpose of this arrangement is: when the bearing is working, the inner ring of the bearing rotates, and the tapered roller will rotate in the opposite direction. The tapered roller has a torque to drive the pillar to rotate. The rolling rotation direction of the tapered roller makes the threaded end of the pillar and the threaded hole of the retaining washer always in a mating state with the thread rotation direction tightened, achieving a self-locking effect, preventing the threaded end of the pillar from loosening during work, reducing the stress condition of the pillar welding end, avoiding deformation, cracking, and falling apart between the pillar welding end and the washer due to impact, and improving the operating reliability and service life of the tapered bearing retainer.

[0013] The guide clearance between the pillars and the tapered rollers is 0.15-0.3 mm. The purpose of this setting is to reasonably set the guide clearance, which not only ensures the freedom of the tapered rollers between the pillars, but also guides the rotation of the tapered rollers through the cage pillars. During the rotation of the bearing, the radial stringing of the cage is small, which solves the problems of excessive guide clearance of existing bearing rollers, non-concentricity of the cage during bearing operation, large vibration, high noise, and easy failure.

[0014] The beneficial effects of the utility model are as follows: the pillars are placed outside the tapered rollers, appropriate guide gaps are provided between the pillars and the tapered rollers, the number of tapered rollers is arranged to the maximum extent, the bearing capacity of the bearing is improved, defects caused by the processing and assembly of the tapered rollers of the bearings are avoided, the stress condition of the pillars is improved, and the operating reliability and service life of the tapered roller bearing cage are improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic diagram of the overall structure of the tapered roller bearing support external retainer of the utility model;

[0016] Figure 2 This is a schematic diagram of the structure of the cage support and tapered rollers of the utility model;

[0017] Figure 3 This is a schematic structural diagram of a first type of retainer structure configured in pairs for tapered roller bearings of the present invention;

[0018] Figure 4 This is a structural diagram of a second type of retainer structure of a tapered roller bearing configured in pairs according to the present invention.

[0019] Markings in the figure: 1, washer; 2, support; 3, countersunk hole; 4, threaded hole; 5, tapered roller; 6, bearing inner ring; 7, bearing outer ring; 8, guide clearance. DETAILED DESCRIPTION

[0020] The specific implementation of the present invention is further described in detail below with reference to the accompanying drawings.

[0021] like Figure 1-4 As shown, a retainer of a tapered roller bearing with an external pillar is provided. The retainer is placed between the bearing inner ring 6 and the bearing outer ring 7. The tapered roller 5 is retained by the retainer between the raceways of the bearing inner ring 6 and the bearing outer ring 7. The retainer includes a pillar 2. Both ends of the pillar 2 are connected to the annular washer 1. The pillar 2 is placed outside the tapered roller 5 and is provided with a guide gap. One end of the pillar 2 is a threaded end, and the other end of the pillar 2 is a welding end. The welding end of the pillar 2 is welded and fixed at the counterbore 3 of the washer 1 on one side. The threaded end of the pillar 2 is connected to the washer 1 on the other side by a thread. The thread rotation direction of the pillar 2 is set to the tightening rotation direction of the thread when the retainer pillar 2 of the bearing is subjected to rotational force.

[0022] The pillars 2 are evenly distributed along the circumference of the annular washer 1, and the spacing between adjacent pillars 2 is adapted to the axial outer diameter size of the tapered roller 5 at 1 / 3 below the axial centerline. The tapered roller 5 is embedded in the pocket formed by the washer 1 and the pillars 2 of the retainer. The axial outer diameters of adjacent tapered rollers 5 at the centerline are close to each other, which can maximize the number of tapered rollers 5 and improve the bearing capacity of the bearing.

[0023] On one side of the retaining frame, the washer 1 is provided with truncated cone-shaped countersunk holes 3 evenly distributed along the circumference, and the welding end of the pillar 2 passes through the washer 1 and is welded and fixed at the countersunk hole 3; on the other side of the retaining frame, the washer 1 is provided with threaded holes 4 evenly distributed along the circumference, and the positions of the threaded holes 4 and the countersunk holes 3 are adapted to each other.

[0024] The guide clearance between the support 2 and the outer periphery of the tapered roller 5 is 0.15-0.3 mm.

[0025] The pillar 2 is made of medium carbon alloy steel, such as 40Cr, and the surface hardness of the pillar 2 after high-frequency quenching treatment is ≥HRC55.

[0026] When mechanical equipment needs to rotate, tapered roller bearings are installed on the rotating part of the equipment. During the bearing's rotation, the inner ring rotates relative to the outer ring, while the tapered rollers roll in opposite directions between the two, reducing friction and evenly distributing the load throughout the bearing, thereby supporting the mechanical equipment's rotational motion. This structure can reduce friction, provide strong load-bearing capacity, ensure smooth rotation, improve equipment efficiency, and achieve load transfer. The cage in the bearing is used to fix the tapered rollers in place, preventing them from colliding with each other or falling out of the bearing. At the same time, the cage can also disperse the load, reduce friction, and reduce noise.

[0027] Single-row tapered roller bearings can bear radial loads and unidirectional axial loads. When the bearing bears radial loads, an axial force component will be generated, which requires another bearing that can bear the opposite axial force to balance it. Usually, a pair of single-row tapered roller bearings is used as the main shaft bearing of large wind turbines. There are two types of cage structures for paired tapered roller bearings, such as Figure 3 As shown, a pair of bearings are provided with a countersunk hole 3 on the small head washer 1 of the retainer, the welding end of the retainer pillar 2 is welded to the small head washer 1, and the threaded end of the pillar 2 is threadedly connected to the large head washer 1. The threaded ends of the pillar 2 and the large head washer 1 of the pair of bearing retainers should have opposite directions of rotation, that is, one is left-handed and the other is right-handed, so that the retainer pillars 2 of the pair of bearings are in the direction of rotation that is conducive to tightening the threads when subjected to rotational force. Figure 4 As shown, a pair of bearings are respectively provided with countersunk holes on the big head washer 1 and the small head washer 1 of the retainer, the welding end of the pillar 2 of one bearing retainer is welded to the big head washer 1, and the threaded end of the pillar 2 is threadedly connected to the small head washer 1, and the welding end of the pillar 2 of the other bearing retainer is welded to the small head washer 1, and the threaded end of the pillar 2 is threadedly connected to the big head washer 1. The thread rotation direction of the threaded end of the pillar 2 and the washer 1 of the pair of bearings should be the same, so as to keep the rotation direction of the retainer pillars 2 of the pair of bearings conducive to tightening the thread when subjected to rotational force.

[0028] The pillar 2 is placed outside the tapered roller 5, and an appropriate guide gap 8 is provided between the pillar 2 and the tapered roller 5, which can maximize the number of tapered rollers 5, improve the bearing capacity of the bearing, and avoid defects caused by the processing and assembly of the center through hole of the tapered roller 5 of the bearing; the pillar 2 is subjected to a rotational force under the action of the tapered roller 5, and the thread rotation direction of the pillar 2 on the retaining frame is set to a direction that is conducive to tightening the thread. The rolling rotation direction of the tapered roller 5 makes the threaded end of the pillar 2 and the threaded hole of the retaining frame washer 1 always in a mating state of tightening the thread rotation direction, achieving a self-locking effect, preventing the threaded end of the pillar 2 from loosening during operation, reducing the stress condition of the welding end of the pillar 2, and avoiding deformation, cracking, and falling apart between the welding end of the pillar 2 and the washer 1 due to impact, ensuring the normal operation of the retaining frame of the tapered roller bearing with external pillars, and improving the operating reliability and service life of the retaining frame of the tapered roller bearing.

[0029] In addition to the above embodiments, the present invention may also have other implementation methods. Any technical solutions formed by equivalent replacement or equivalent transformation fall within the scope of protection required by the present invention.

Claims

1. A retainer for a tapered roller bearing with an external pillar, wherein the retainer is placed between the inner and outer rings of the bearing, and the tapered rollers are retained by the retainer between the raceways of the inner and outer rings of the bearing, characterized in that: The cage includes a pillar, both ends of which are connected to the annular washers. The pillar is placed outside the tapered roller and is provided with a guide gap. One end of the pillar is a threaded end and the other end of the pillar is a welding end. The welding end of the pillar is welded and fixed at the countersunk hole of the washer on one side. The threaded end of the pillar is connected to the washer on the other side through a thread. The thread rotation direction of the pillar is set to the tightening rotation direction of the thread when the cage pillar of the bearing is subjected to rotational force.

2. The tapered roller bearing retainer with external pillars according to claim 1, characterized in that: The pillars are evenly distributed along the circumference of the annular washer, and the spacing between adjacent pillars is adapted to the axial outer diameter size of the tapered roller at 1 / 3 below the axial centerline. The tapered roller is embedded in the pocket formed by the washer and pillars of the retainer, and the outer diameters of adjacent tapered rollers are close to each other at the centerline.

3. The tapered roller bearing retainer with external pillars according to claim 1, characterized in that: The washer on one side of the retainer is evenly distributed along the circumference with truncated cone-shaped countersunk holes, and the welding end of the pillar passes through the washer and is welded and fixed at the countersunk hole; the washer on the other side of the retainer is evenly distributed along the circumference with threaded holes, and the positions of the threaded holes and the countersunk holes are adapted to each other.

4. The tapered roller bearing retainer with external pillars according to claim 1, characterized in that: The guide clearance between the support and the outer circumference of the tapered roller is 0.15-0.3mm.

5. The tapered roller bearing retainer with external pillars according to claim 1, characterized in that: The pillar is made of medium carbon alloy steel, and the surface hardness of the pillar after high-frequency quenching treatment is ≥HRC55.

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