Fishbone type tapered roller bearing retainer

Abstract

The invention provides a fishbone type tapered roller bearing retainer. The fishbone type tapered roller bearing retainer comprises a supporting 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 invention belongs to the technical field of main shaft bearings of large megawatt wind power generator sets, in particular to a herringbone type tapered roller bearing retainer. Background Art

[0002] The main shaft bearing is an important part of the wind turbine generator set. It mainly bears the weight and wind load of the wind turbine blades, hub, and main shaft. It is an important component that supports the main shaft to transmit the driving force to the generator. The load of the main shaft bearing is subject to great randomness due to wind direction and wind force, and its life span is required to be high (20 years or more). It is a relatively weak link in the wind turbine. Its performance and reliability directly affect the normal operation of the wind turbine.

[0003] There are many structural forms of main shaft bearings for wind turbines. In recent years, the main shaft bearing structure with two sets of single-row tapered roller bearings installed across the main shaft bearings has become the mainstream in large-power wind turbines.

[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 "pin-through cages" with perforated rolling elements, which can maximize the bearing space and load-bearing capacity, but there is a risk of poor lubrication between the pins and the rolling element holes. The cage is not integrally formed, and the connection structure also has the risk of failure. Traditional cages cannot meet the high life requirements of spindle bearings. At present, the mainstream choice for single-row tapered spindle bearings of fans is a machined basket-shaped cage with a structure similar to that of a stamped cage. It has high precision and acceptable use effect, but low material utilization, low processing efficiency, and high cost. Summary of the invention

[0005] In view of the above problems, the purpose of this application is to provide a herringbone tapered roller bearing retainer, which can improve material utilization, reduce processing difficulty, improve processing efficiency, and reduce mass production costs. At the same time, it can reduce rolling element wear, reduce the risk of bearing failure, and increase bearing service life.

[0006] To achieve some or all of the above-mentioned purposes or other purposes, the present application provides the following technical solutions: a fishbone type tapered roller bearing retainer, comprising a pillar, a fixing head and a fixing claw; the pillar is a rectangular parallelepiped, comprising a group of opposite end faces, a group of opposite large side faces and a group of opposite small side faces; there are two fixing heads, a first fixing head and a second fixing head, one end face of the pillar is connected to the first fixing head, and the other end face of the pillar is connected to the second fixing head; the fixing claw is a trapezoid with thickness, and there are two groups of fixing claws, a first group of fixing claws and a second group of fixing claws, the first group of fixing claws and the second group of fixing claws are arranged perpendicular to the large side face of the pillar, the upper base of the first group of fixing claws is connected to a small side face of the pillar, and the upper base of the second group of fixing claws is connected to another small side face of the pillar; the length of the pillar is greater than the height of the tapered roller bearing.

[0007] Furthermore, the first group of fixing claws has two fixing claws, the second group of fixing claws has two fixing claws, and the distance between the two fixing claws of the first group is greater than the distance between the two fixing claws of the second group.

[0008] Further, the first group of fixing claws has at least three fixing claws, and the second group of fixing claws has at least three fixing claws.

[0009] Furthermore, a group of opposite large side surfaces of the pillar are provided with protrusions at both ends close to the first fixed head and the second fixed head, and the protrusions are in line contact with the tapered roller bearing.

[0010] Furthermore, the herringbone tapered roller bearing retainer is an integrated type.

[0011] Furthermore, the herringbone tapered roller bearing retainer is in line contact with the tapered roller.

[0012] Furthermore, the width of the upper base where the herringbone tapered roller bearing retainer is connected to the pillar is equal to the width of the small side surface of the pillar.

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

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

[0015] Further, the assembly method is as follows: Step 1: Install the inner ring, with the large end surface of the inner ring flat on the ground; Step 2: Place the tapered roller and herringbone tapered roller bearing retainer on the inner ring raceway one by one; Step 3: Install the last one or two tapered rollers and the herringbone tapered roller bearing retainer onto the inner ring raceway at the same time; Step 4: Install the outer ring and put it on the outside of the tapered roller and herringbone tapered roller bearing retainer.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. A separate herringbone retainer is installed between every two tapered roller bearings, rather than an integral retainer, so that the structural deformation of the integral retainer, especially the elliptical deformation, can be avoided. 2. The outer dimensions of a single herringbone retainer are small, which reduces the difficulty of processing and the requirements for processing equipment. 3. The rolling element spacing distance is directly controlled by controlling the thickness of the retainer working area, thereby ensuring the circumferential position of the rolling element. Controlling a single main working dimension avoids the compound influence of processing accuracy on the working effect. 4. The retainer does not protrude from the end face of the ring or the protrusion is very small, reducing the installation space required for the bearing. 5. There is no retainer rib, and the internal covering area is small, which facilitates the lubricating grease to enter the bearing and improves the bearing lubrication. 6. The main force of the retainer is the extrusion of the two adjacent rollers on the convex block, and this extrusion force acts only to ensure the axial position of the roller, and the size is limited. The remaining parts of the retainer are subjected to less force. 7. Improving the processing accuracy at the working area (convex block) can significantly improve the use effect. Except for the working area (bump), the accuracy of other parts has little effect on the use effect, and the requirements can be relaxed to facilitate processing and reduce costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the structure of the present invention installed between tapered roller bearings; Figure 2 It is a structural schematic diagram of the present invention; Figure 3 is a cross-sectional view of the present invention; In the figure: 1, pillar; 1-1, small side; 1-2, large side; 2, first fixing head; 3, second fixing head; 4, first set of fixing claws; 5, second set of fixing claws; 6, bump. DETAILED DESCRIPTION

[0018] In order to make the structure and function of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0019] See attached Figure 1-3, a fishbone type tapered roller bearing retainer, comprising a pillar 1, a fixed head and a fixed claw; the pillar 1 is a rectangular parallelepiped, comprising a group of opposite end faces, a group of opposite large side faces 1-2 and a group 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 claw is a trapezoid with thickness, and 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 vertically arranged with the large side face 1-2 of the pillar 1, the upper base of the first group of fixed claws 4 is connected with a small side face 1-1 of the pillar 1, and the upper base of the second group of fixed claws 5 is connected with another 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.

[0020] Furthermore, the first group of fixing claws 4 has two fixing claws, the second group of fixing claws 5 has two fixing claws, and the distance between the two first group of fixing claws 4 is greater than the distance between the two second group of fixing claws 5 .

[0021] Further, the first group of fixing claws 4 has at least three fixing claws, and the second group of fixing claws 5 has at least three fixing claws.

[0022] Furthermore, a group of relatively large side surfaces 1-2 of the pillar 1 are provided with bumps 6 at both ends close to the first fixed head 2 and the second fixed head 3, and the bumps 6 are in line contact with the tapered roller bearing; only the small surface of the bump 6 is in contact with the roller and works, and the middle part does not contact the roller, and only the tolerance and roughness of the small surface of the bump 6 need to be guaranteed, and the size and shape of the middle part can be relaxed without affecting the use and facilitating processing; only the working surface of the small surface of the bump 6 is controlled, and the achievable accuracy can be higher, and the use effect is better.

[0023] The main force on the retainer is the squeezing of the two adjacent rollers on the convex block, and this squeezing force is only used to ensure the axial position of the rollers and is limited in size. The rest of the retainer is subject to less force.

[0024] Furthermore, the herringbone tapered roller bearing retainer is an integrated type.

[0025] Furthermore, the herringbone tapered roller bearing retainer is in line contact with the tapered roller.

[0026] Furthermore, the width of the upper base where the herringbone tapered roller bearing retainer is connected to the pillar 1 is equal to the width of the small side surface 1 - 1 of the pillar 1 .

[0027] Furthermore, two corners of the first set of fixing claws 4 and the second set of fixing claws 5 adjacent to the bottom edge are chamfered.

[0028] Furthermore, the number of the tapered roller bearings is the same as the number of the pillars 1 , and the tapered roller bearings and the pillars 1 are arranged at intervals.

[0029] Further, the assembly method is as follows: Step 1: Install the inner ring, with the large end surface of the inner ring flat on the ground; Step 2: Place the tapered roller and herringbone tapered roller bearing retainer on the inner ring raceway one by one; Step 3: Install the last one or two tapered rollers and the herringbone tapered roller bearing retainer onto the inner ring raceway at the same time; Step 4: Install the outer ring and put it on the outside of the tapered roller and herringbone tapered roller bearing retainer.

[0030] Furthermore, the cage material is made of non-metallic material, which improves material utilization, reduces processing difficulty, and improves processing efficiency. At the same time, it can avoid the cage scratching the rolling element and causing bearing failure, and can also reduce the impact of wear particles.

[0031] Furthermore, the working principle of the herringbone tapered roller bearing retainer is as follows: the thickness of the working area of ​​the retainer's large and small heads is similar to the spacing between the large and small heads of the tapered roller bearing in a uniform distribution 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 ferrule ribs. The four fixing claws on the upper and lower parts of the retainer rely on rolling bodies to ensure the radial position of the retainer. The two front and rear fixing heads rely on rolling bodies to ensure the axial position of the retainer.

[0032] Furthermore, the basic dimensions of the retainer are determined based on the roller diameter and length. Based on the position and number of the rolling elements in the bearing, the spacing between the large and small heads of the rolling elements in a uniformly distributed state is determined, thereby determining the thickness of the retainer working area. Furthermore, if the inner ring raceway angle is small, the roller is easy to tip outward after being placed on it. A simple annular tooling can be placed on the outer ring of the inner ring large rib to assist in fixing the roller and prevent it from tipping outward.

[0033] Furthermore, in actual operation, it should be prioritized to ensure that the roller and the retainer protrusion are in contact with each other. Therefore, during operation, one of the first set of fixing claws 4 and the second set of fixing claws 5 should be in contact with the roller, and there should be a small gap between the other set and the roller.

[0034] The above disclosure is only the preferred embodiment of the present application, which certainly cannot be used to limit the scope of rights of the present application. Therefore, equivalent changes made according to the claims of the present application are still within the scope covered by the present application.

Claims

1. Herringbone tapered roller bearing retainer, characterized by: It includes a pillar, a fixed head and a fixed claw; the pillar is a rectangular parallelepiped, including a group of opposite end faces, a group of opposite large side faces and a group 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 claw is a thick trapezoid, and 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 vertically arranged with the large side face of the pillar, the upper base of the first group of fixed claws is connected with a small side face of the pillar, and the upper base of the second group of fixed claws is connected with the other small side face of the pillar; the length of the pillar is greater than the height of the tapered roller bearing.

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

3. The herringbone tapered roller bearing retainer according to claim 1, characterized in that: The first group of fixing claws has at least three fixing claws, and the second group of fixing claws has at least three fixing claws.

4. The herringbone tapered roller bearing retainer according to claim 1, characterized in that: A group of opposite large side surfaces of the pillar are provided with bulges at both ends close to the first fixed head and the second fixed head, and the bulges are in line contact with the tapered roller bearing.

5. The herringbone tapered roller bearing retainer according to claim 1, characterized in that: The herringbone tapered roller bearing retainer is an integrated type.

6. The herringbone tapered roller bearing retainer according to claim 1, characterized in that: The herringbone tapered roller bearing retainer is in line contact with the tapered roller.

7. The herringbone tapered roller bearing retainer according to claim 1, characterized in that: The width of the upper base where the herringbone tapered roller bearing retainer is connected to the pillar is equal to the width of the small side surface of the pillar.

8. The herringbone tapered roller bearing retainer according to claim 1, characterized in that: Two corners of the first group of fixing claws and the second group of fixing claws adjacent to the bottom edge are chamfered.

9. The herringbone tapered roller bearing retainer according to any one of claims 1 to 8, characterized in that: The number of the tapered roller bearings is the same as the number of the pillars, and the tapered roller bearings and the pillars are arranged at intervals.

10. The herringbone tapered roller bearing retainer according to claim 9 is characterized in that: The assembly method is as follows: Step 1: Install the inner ring, with the large end surface of the inner ring flat on the ground; Step 2: Place the tapered roller and herringbone tapered roller bearing retainer on the inner ring raceway one by one; Step 3: Install the last one or two tapered rollers and the herringbone tapered roller bearing retainer onto the inner ring raceway at the same time; Step 4: Install the outer ring and put it on the outside of the tapered roller and herringbone tapered roller bearing retainer.

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