Fishbone type tapered roller bearing retainer

Abstract

The utility model provides a fishbone type tapered roller bearing retainer. The fishbone type tapered roller bearing retainer comprises a support column, a fixing head and a fixing claw, the supporting column is a cuboid and comprises a set of opposite end faces, a set of opposite large side faces and a set of opposite small side faces. The two fixing heads include the first fixing head and the second fixing head, one end face of the supporting column is connected with the first fixing head, and the other end face of the supporting column is connected with the second fixing head. The fixing claws are in a trapezoid shape with the thickness, the two sets of fixing claws comprise the first set of fixing claws and the second set of fixing claws, the first set of fixing claws and the second set of fixing claws are perpendicular to the large side face of the supporting column, the upper bottom of the first set of fixing claws is connected with one small side face of the supporting column, and the upper bottom of the second set of fixing claws is connected with the other small side face of the supporting column. The material utilization rate can be improved, the machining difficulty is reduced, the machining efficiency is improved, the batch production cost is reduced, rolling body abrasion can be reduced, the bearing failure risk is reduced, and the service life of the bearing is prolonged.

Description

Technical Field

[0001] The utility model belongs to the technical field of main shaft bearings of large-megawatt wind turbines, and particularly relates to a fishbone type tapered roller bearing cage. Background Art

[0002] The main shaft bearing is an important part of a wind turbine generator set, mainly bearing the weights of the fan blades, hub and main shaft, as well as wind loads. It is an important component for supporting the main shaft and transmitting the driving force to the generator. The load of the main shaft bearing has great randomness due to the wind direction and wind force, and its service life requirement is relatively high (20 years or more). It is a relatively weak link in the wind turbine, and its performance and reliability directly affect the normal operation of the wind turbine.

[0003] There are various structural forms of main shaft bearings for wind turbine generator sets. In recent years, in high-power wind turbines, the structural form of a main shaft bearing with two sets of single-row tapered roller bearings mounted across has become the mainstream.

[0004] Traditional small tapered roller bearings mostly use steel plate stamping cages, which have high production efficiency and low cost, but low precision. Traditional large tapered roller bearings can use a "pin-through cage" with perforated rolling elements, which can make the most of the bearing space and maximize the load-carrying capacity. However, there is a risk of poor lubrication between the pins and the rolling element holes, and the cage is not integrally formed, and the connection structure also has a risk of failure. Traditional cages cannot meet the high service life requirements of main shaft bearings. Currently, the mainstream choice for single-row tapered main shaft bearings of wind turbines is a machined basket-shaped cage similar to the stamping cage structure, which has high precision and acceptable use effects, but low material utilization rate, low processing efficiency and high cost. Summary of the Utility Model

[0005] In view of the above problems, the purpose of this application is to provide a fishbone type tapered roller bearing cage, which can improve the material utilization rate, reduce the processing difficulty, improve the processing efficiency, reduce the batch production cost, and at the same time can reduce the wear of the rolling elements, reduce the risk of bearing failure and improve the service life of the bearing.

[0006] To achieve some or all of the above purposes or other purposes, the present application provides the following technical solutions: A fishbone type tapered roller bearing cage, including a pillar, a fixed head and fixed claws; the pillar is a cuboid, including a set of opposite end faces, a set of opposite large side faces and a set of opposite small side faces; there are two fixed heads, a first fixed head and a second fixed head, one end face of the pillar is connected to the first fixed head, and the other end face of the pillar is connected to the second fixed head; the fixed claws are trapezoidal with thickness, there are two groups of fixed claws, a first group of fixed claws and a second group of fixed claws, the first group of fixed claws and the second group of fixed claws are perpendicular to the large side face of the pillar, the upper base of the first group of fixed claws is connected to one small side face of the pillar, and the upper base of the second group of fixed claws is connected to the other small side face of the pillar; the length of the pillar is greater than the height of the tapered roller bearing.

[0007] Further, there are two fixed claws in the first group of fixed claws, and there are two fixed claws in the second group of fixed claws, and the distance between the two first group of fixed claws is greater than the distance between the two second group of fixed claws.

[0008] Further, there are at least three fixed claws in the first group of fixed claws, and there are at least three fixed claws in the second group of fixed claws.

[0009] Further, convex blocks are provided at both ends of a set of opposite large side faces of the pillar close to the first fixed head and the second fixed head, and the convex blocks are in line contact with the tapered roller bearing.

[0010] Further, the fishbone type tapered roller bearing cage is integrally formed.

[0011] Further, the fishbone type tapered roller bearing cage is in line contact with the tapered roller.

[0012] Further, the width of the upper base of the fishbone type tapered roller bearing cage connected to the pillar is equal to the width of the small side face of the pillar.

[0013] Further, the two corners of the first group of fixed claws and the second group of fixed claws adjacent to the bottom edge are chamfered.

[0014] Further, the number of tapered roller bearings is the same as the number of pillars, and the tapered roller bearings and the pillars are arranged at intervals.

[0015] Further, the assembly method is as follows:

[0016] Step 1: Install the inner ring, and place the large end face of the inner ring flat on the ground;

[0017] Step 2: Place the tapered rollers and the fishbone type tapered roller bearing cage on the inner ring raceway one by one in turn;

[0018] Step 3: Install the last one or two tapered rollers and a fishbone-type tapered roller bearing cage onto the inner raceway simultaneously;

[0019] Step 4: Install the outer ring by sleeving it outside the tapered rollers and a fishbone-type tapered roller bearing cage.

[0020] Compared with the prior art, the beneficial effects of the present utility model are as follows: 1. Install a separate fishbone-type cage between every two tapered roller bearings instead of an integral cage, which can avoid the influence of the structural deformation, especially the elliptical deformation of the integral cage, on the bearing. 2. The outer dimension of a single fishbone-type cage is small, reducing the processing difficulty and the requirements for processing equipment. 3. By controlling the thickness of the working area of the cage, directly control the distance between rolling elements, and then ensure the circumferential position of the rolling elements. Control a single main working dimension to avoid the combined influence of processing accuracy on the working effect. 4. The cage does not protrude from the end face of the ring or protrudes very little, reducing the installation space required for the bearing. 5. There are no cage ribs, and the covering area of the interior is small, facilitating the entry of lubricating grease into the bearing interior and improving the bearing lubrication. 6. The main force on the cage is the extrusion at the convex blocks by two adjacent rollers, and this extrusion force only serves to ensure the axial position of the rollers and is limited in magnitude. The force on the remaining parts of the cage is small. 7. Improving the processing accuracy at the working area (convex blocks) can significantly improve the use effect. The accuracy of the parts other than the working area (convex blocks) has little influence on the use effect, and the requirements can be relaxed, facilitating processing and reducing costs. Description of the Drawings

[0021] Figure 1 is a schematic structural diagram of the present utility model installed between tapered roller bearings;

[0022] Figure 2 is a schematic structural diagram of the present utility model;

[0023] Figure 3 is a sectional view of the present utility model;

[0024] In the figure: 1, strut; 1-1, small side; 1-2, large side; 2, first fixed head; 3, second fixed head; 4, first group of fixed claws; 5, second group of fixed claws; 6, convex block. Detailed Embodiments

[0025] In order to make the structure and function of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model.

[0026] See the appendix Figures 1-3, A fishbone type tapered roller bearing cage, comprising a pillar 1, a fixed head and fixed claws; the pillar 1 is a cuboid, including a set of opposite end faces, a set of opposite large side faces 1-2 and a set of opposite small side faces 1-1; there are two fixed heads, a first fixed head 2 and a second fixed head 3, one end face of the pillar 1 is connected to the first fixed head 2, and the other end face of the pillar 1 is connected to the second fixed head 3; the fixed claws are trapezoidal with thickness, there are two groups of fixed claws, a first group of fixed claws 4 and a second group of fixed claws 5, the first group of fixed claws 4 and the second group of fixed claws 5 are perpendicular to the large side face 1-2 of the pillar 1, the upper base of the first group of fixed claws 4 is connected to one small side face 1-1 of the pillar 1, and the upper base of the second group of fixed claws 5 is connected to the other small side face 1-1 of the pillar 1; the length of the pillar 1 is greater than the height of the tapered roller bearing.

[0027] Further, the first group of fixed claws 4 has two fixed claws, the second group of fixed claws 5 has two fixed claws, and the distance between the two first group of fixed claws 4 is greater than the distance between the two second group of fixed claws 5.

[0028] Further, the first group of fixed claws 4 has at least three fixed claws, and the second group of fixed claws 5 has at least three fixed claws.

[0029] Further, convex blocks 6 are provided at both ends of a set of opposite large side faces 1-2 of the pillar 1 close to the first fixed head 2 and the second fixed head 3, and the convex blocks 6 are in line contact with the tapered roller bearing; only the small faces of the convex blocks 6 are in contact with the rollers and function, and the middle is not in contact with the rollers. Only the tolerances and roughness of the small faces of the convex blocks 6 need to be ensured. The dimensions and geometric tolerances of the middle part can be relaxed without affecting the use and are convenient for processing; only controlling the working surfaces of the small faces of the convex blocks 6 can achieve higher precision and better use effect.

[0030] The main force on the cage is the extrusion of two adjacent rollers on the convex block, and this extrusion force only serves to ensure the axial position of the rollers and is limited in magnitude. The forces on the other parts of the cage are relatively small.

[0031] Further, the fishbone type tapered roller bearing cage is integrally formed.

[0032] Further, the fishbone type tapered roller bearing cage is in line contact with the tapered rollers.

[0033] Further, the width of the upper base of the fishbone type tapered roller bearing cage connected to the pillar 1 is equal to the width of the small side face 1-1 of the pillar 1.

[0034] Further, the two corners of the first group of fixed claws 4 and the second group of fixed claws 5 adjacent to the bottom edge are chamfered.

[0035] Further, the number of the tapered roller bearings is the same as that of the struts 1, and the tapered roller bearings and the struts 1 are arranged at intervals.

[0036] Further, the assembly method is as follows:

[0037] Step 1: Install the inner ring, with the large end face of the inner ring placed flat on the ground;

[0038] Step 2: Place the tapered rollers and a fishbone-type tapered roller bearing cage one by one onto the inner ring raceway in turn;

[0039] Step 3: Install the last one or two tapered rollers and a fishbone-type tapered roller bearing cage onto the inner ring raceway simultaneously;

[0040] Step 4: Install the outer ring, and fit the outer ring over the outside of the tapered rollers and a fishbone-type tapered roller bearing cage.

[0041] Further, the cage is made of non-metallic material, which improves the material utilization rate, reduces the processing difficulty, and improves the processing efficiency. At the same time, it can avoid the problem of bearing failure caused by the cage scratching the rolling elements, and can also reduce the influence of wear particles.

[0042] Further, the working principle of the fishbone-type tapered roller bearing cage: The thickness of the working areas at the large and small ends of the cage is approximately equal to the distance between the large and small ends of the tapered roller bearing in the evenly distributed state, so as to ensure the circumferential position of the tapered roller bearing. The radial position of the tapered roller bearing is ensured by the inner and outer rings, and the axial position of the tapered roller bearing is ensured by the ring ribs. The upper and lower four fixing claws of the cage rely on the rolling elements to ensure the radial position of the cage. The front and rear two fixing heads rely on the rolling elements to ensure the axial position of the cage.

[0043] Further, determine the basic outer dimensions of the cage according to dimensions such as the diameter and length of the rollers. According to the position and number of the rolling elements of the bearing, determine the distance between the large and small ends of the rolling elements in the evenly distributed state, and thereby determine the thickness of the working area of the cage.

[0044] Further, if the angle of the inner ring raceway is small, the rollers are likely to tilt outward after being placed. A simple ring-shaped tooling can be placed on the outer ring of the large rib of the inner ring to assist in fixing the rollers and prevent the rollers from tilting outward.

[0045] Further, during actual operation, the contact between the rollers and the convex blocks of the cage should be ensured preferentially. Therefore, during operation, one of the first group of fixing claws 4 and the second group of fixing claws 5 should be in contact with the rollers, and there should be a slight gap between the other group and the rollers.

[0046] The above-disclosed are only the preferred embodiments of the present application. Of course, the scope of the rights of the present application cannot be limited thereby. Therefore, equivalent changes made according to the claims of the present application still fall within the scope covered by the present application.

Claims

1. A fishbone type tapered roller bearing cage, characterized in that: It includes a support column, a fixed head, and fixed claws; the support column is a cuboid, including a set of opposite end faces, a set of opposite large side faces, and a set of opposite small side faces; there are two fixed heads, a first fixed head and a second fixed head, one end face of the support column is connected to the first fixed head, and the other end face of the support column is connected to the second fixed head; the fixed claws are trapezoidal with thickness, there are two groups of fixed claws, a first group of fixed claws and a second group of fixed claws, the first group of fixed claws and the second group of fixed claws are perpendicular to the large side face of the support column, the upper base of the first group of fixed claws is connected to one small side face of the support column, and the upper base of the second group of fixed claws is connected to the other small side face of the support column; the length of the support column is greater than the height of the tapered roller bearing.

2. The cage of the fishbone type tapered roller bearing according to claim 1, characterized in that: The first group of fixed claws has two fixed claws, the second group of fixed claws has two fixed claws, and the distance between the two first group of fixed claws is greater than the distance between the two second group of fixed claws.

3. A fishbone type tapered roller bearing cage according to claim 1, characterized in that: The first group of fixed claws has at least three fixed claws, and the second group of fixed claws has at least three fixed claws.

4. A fishbone type tapered roller bearing cage according to claim 1, characterized in that: Protrusions are provided at both ends of a set of opposite large side faces of the support column near the first fixed head and the second fixed head, and the protrusions are in line contact with the tapered roller bearing.

5. A fishbone type tapered roller bearing cage according to claim 1, characterized in that: A fishbone-type tapered roller bearing cage is integrally formed.

6. The cage of the fishbone type tapered roller bearing according to claim 1, characterized in that: The fishbone-type tapered roller bearing cage is in line contact with the tapered roller.

7. A fishbone type tapered roller bearing cage according to claim 1, characterized in that: The width of the upper base where the fishbone-type tapered roller bearing cage is connected to the support column is equal to the width of the small side face of the support column.

8. A fishbone type tapered roller bearing cage according to claim 1, characterized in that: The two corners of the first group of fixed claws and the second group of fixed claws adjacent to the bottom edge are chamfered.

9. A fishbone type tapered roller bearing cage according to any one of claims 1-8, characterized in that: The number of tapered roller bearings is the same as the number of support columns, and the tapered roller bearings and the support columns are arranged at intervals.

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