Solid-transfer lubrication hybrid transmission bearing and manufacturing method

Abstract

A solid-transfer lubrication hybrid transmission bearing and a manufacturing method therefor. The bearing comprises an outer ring, an inner ring, a cage, rolling balls and lubricating balls, wherein the cage is configured between the outer ring and the inner ring; rolling ball pockets are provided on at least one axial side of the cage, the plurality of rolling ball pockets being arranged in the circumferential direction of the cage; the outer ring, the inner ring and the rolling ball pockets form a first space for accommodating the rolling balls, and an isolation lubricating layer is provided on an inner wall of the rolling ball pocket, the hardness of the rolling ball being greater than the hardness of the isolation lubricating layer; lubricating ball pockets are provided on an outer circular surface of the cage, the plurality of lubricating ball pockets being arranged in the circumferential direction of the cage; and the outer ring and the lubricating ball pockets form a second space for accommodating the lubricating balls. The bearing has a dual-lubrication effect, achieves solid-transfer lubrication, can achieve sliding friction having a low friction coefficient, and can also achieve dynamic compensation for rolling and sliding.

Description

Solid transfer lubrication hybrid transmission bearing and manufacturing method TECHNICAL FIELD

[0001] The present application relates to the technical field of bearing structure design, in particular to a solid transfer lubrication hybrid transmission bearing and manufacturing method. BACKGROUND

[0002] The use environment of bearings includes but is not limited to high temperature, high pressure, specific medium (water, inert gas, metal solution), impact, etc. The main function of the bearing is to support and transmit, and it needs to meet the requirements of service life, ensure transmission accuracy, intermittent operation, etc. under the above working conditions.

[0003] The bearing of the prior art is generally composed of a sleeve ring, a rolling body and a retainer. The sleeve ring and the rolling body are made of high-temperature bearing steel, heat-resistant alloy steel, stainless bearing steel or ceramic. The retainer is generally made of metal or engineering plastic. The above-mentioned prior art bearing can only be used alone under certain working conditions. Due to the characteristics of the material itself, impact resistance requires high toughness, and wear resistance requires high hardness and high strength of the material at high temperature. In order to meet the requirements of service life, the bearing needs to be plated or lubricated by solid transfer lubrication to lubricate the raceway and the rolling body under oil-free lubrication conditions to reduce the friction coefficient.

[0004] The bearing of the prior art cannot simultaneously meet the requirements of high temperature resistance, radiation resistance, corrosion resistance, impact resistance, wear resistance, high precision, long service life and oil-free lubrication, and there is room for improvement.

[0005] SUMMARY

[0006] In view of the defects in the prior art, the purpose of the present application is to provide a solid transfer lubrication hybrid transmission bearing and manufacturing method.

[0007] According to the solid transfer lubrication hybrid transmission bearing provided by the present application, the bearing comprises an outer sleeve ring, an inner sleeve ring, a retainer, a rolling ball and a lubricating ball. The retainer is arranged between the outer sleeve ring and the inner sleeve ring.

[0008] At least one side of the retainer in the axial direction is provided with a rolling ball pocket hole. A plurality of rolling ball pocket holes are arranged in the circumferential direction of the retainer. The outer sleeve ring, the inner sleeve ring and the rolling ball pocket hole form a first space for accommodating the rolling ball. An isolation lubricating layer is arranged on the inner wall of the rolling ball pocket hole. The hardness of the rolling ball is greater than the hardness of the isolation lubricating layer.

[0009] A lubricating ball pocket hole is arranged on the outer circumferential surface of the retainer. A plurality of lubricating ball pocket holes are arranged in the circumferential direction of the retainer. The outer sleeve ring and the lubricating ball pocket hole form a second space for accommodating the lubricating ball.

[0010] Preferably, the rolling ball pockets are arranged in two groups on both sides of the cage in the axial direction, and the inner rings are arranged in two groups on both sides of the outer ring in the axial direction, and the two groups of inner rings correspond to the two groups of rolling ball pockets one by one.

[0011] Preferably, the rolling ball pockets and the lubricating ball pockets are arranged alternately in the circumferential direction of the cage.

[0012] Preferably, the side surface of the outer ring in the axial direction is provided with a first coupling slope, and the outer circle of the inner ring is provided with a second coupling slope, and the first coupling slope and the second coupling slope are coupled.

[0013] Preferably, the rolling ball and the inner wall of the rolling ball pocket are in point contact, and the rolling ball and the rolling ball pocket are in clearance fit.

[0014] The inner wall of the outer ring is provided with a first raceway, the rolling ball and the first raceway are in single-point contact, and the micro-contact state of the rolling ball and the first raceway is elliptical elastic contact.

[0015] The outer wall of the inner ring is provided with a second raceway, the rolling ball and the second raceway are in single-point contact, and the micro-contact state of the rolling ball and the second raceway is elliptical elastic contact.

[0016] Preferably, the inner ring comprises an outer circle, a second raceway and a sliding friction surface arranged in sequence in the axial direction, the sliding friction surface is in sliding contact with the outer ring and / or the cage, and the sliding contact state is complementary to the contact state of the inner ring, the outer ring and the steel ball during normal operation of the bearing and with the running of the bearing. Wear, the sliding contact surface can be adjusted to a smooth cylindrical hole and a smooth cylindrical shaft contact with an intermittent isolation layer, the cage is provided with a hole communicating the sliding friction surface and the lubricating ball pocket; The outer circle of the inner ring is provided with a flow guide hole, and the flow guide hole communicates the internal space of the bearing and the external space of the bearing.

[0017] Preferably, the outer ring comprises an impact-resistant outer ring body and a wear-resistant isolation layer, and the isolation layer covers the first raceway, the first coupling slope and extends to the end face area of the outer ring body.

[0018] The inner ring comprises an impact-resistant inner ring body and a wear-resistant isolation layer, and the isolation layer covers the second raceway, the sliding friction surface and extends to the end face area of the inner ring body.

[0019] The cage comprises an impact-resistant cage body and an isolation layer, and the isolation layer comprises a bonding layer, a reinforcing layer and a lubricating layer combined with the base body arranged in sequence.

[0020] Preferably, the hardness of the cage is lower than the hardness of the rolling ball, and the hardness of the cage is greater than the hardness of the lubricating ball.

[0021] According to the application, a manufacturing method of a solid transfer lubrication mixed transmission bearing is provided, and the manufacturing method comprises the following steps:

[0022] The lubricating balls are sequentially arranged in the lubricating ball pockets of the retainer, the retainer is inserted into the inner hole of the outer ring, the rolling balls are sequentially arranged from one side of the inner hole of the outer ring, and then the inner ring is arranged, thereby completing the installation of one side of the bearing;

[0023] The rolling balls are sequentially arranged from the other side of the inner hole of the outer ring, and then the inner ring is arranged, thereby completing the installation of both sides of the bearing.

[0024] Preferably, after the installation is completed, the inner ring is fixed by the rotating shaft, the end face is pressed, the axial and radial clearances of the outer ring are measured, the clearances are compared with the designed clearances, the contact surface of the inner ring is ground, and the clearance value of the bearing is adjusted to the designed value.

[0025] Compared with the prior art, the application has the following beneficial effects:

[0026] 1. The application realizes the double lubrication effect by arranging the lubricating layer at the rolling ball pockets and arranging the lubricating balls on the outer circular surface of the retainer, realizes the lubrication by the solid transfer lubrication, realizes the low friction coefficient sliding friction, and realizes the dynamic compensation of rolling and sliding.

[0027] 2. The application adopts the double half inner ring, can realize the gapless installation of the rolling body, ensures the consistency of the bearing ring, and realizes the installation of the rolling body and the internal retainer without the gap of the integral inner ring. The outer ring adopts the integral outer ring, and the two rings are not used to cooperate with the inner ring, mainly to ensure the boundary integrity, encapsulate the retainer in the internal, form the semi-sealed cavity, and increase the lubrication effect of the transfer lubrication.

[0028] 3. The application is provided with the flow guide hole on the outer circle of the inner ring, the flow guide hole communicates the internal space of the bearing and the external space of the bearing, and the flow guide hole arranged on the inner ring enables the bearing to have the appropriate chip removal function. BRIEF DESCRIPTION OF DRAWINGS

[0029] Other characteristics, objects and advantages of the application will become more apparent from the following detailed description of non-restrictive embodiments, made with reference to the accompanying drawings:

[0030] Fig. 1 is a schematic view of the overall structure of the bearing;

[0031] Fig. 2 is a sectional view of the overall structure of the bearing;

[0032] Fig. 3 is an exploded view of the overall structure of the bearing;

[0033] Fig. 4 is a schematic view of the overall structure of the outer race in the axial direction according to the present application;

[0034] Fig. 5 is a sectional view of the overall structure of the outer race according to the present application;

[0035] Fig. 6 is a schematic view of the overall structure of the inner race according to the present application;

[0036] Fig. 7 is a schematic view of the overall structure of the retainer in the axial direction according to the present application;

[0037] Fig. 8 is a schematic view of the overall structure of the retainer in the lateral direction according to the present application;

[0038] Fig. 9 is a sectional view of the overall structure of the retainer according to the present application.

[0039] In the drawings:

[0040] Outer race 1 Retainer 3

[0041] First coupling slope 11 Rolling ball pocket 31

[0042] First raceway 12 Isolated lubricating layer 32

[0043] Inner race 2 Lubricating ball pocket 33

[0044] Second coupling slope 21 Rolling ball 4

[0045] Second raceway 22 Lubricating ball 5

[0046] Flow guide hole 23 DETAILED DESCRIPTION

[0047] The present application will be described in detail below with reference to specific embodiments. The following embodiments will help those skilled in the art to further understand the present application, but do not limit the present application in any form. It should be noted that those skilled in the art can make several changes and improvements without departing from the concept of the present application. These are within the scope of protection of the present application.

[0048] As shown in FIG. 1, FIG. 2 and FIG. 3, a solid transfer lubrication hybrid transmission bearing provided by the present application comprises an outer race 1, an inner race 2, a retainer 3, rolling balls 4 and lubricating balls 5, the retainer 3 is arranged between the outer race 1 and the inner race 2. At least one side of the retainer 3 in the axial direction is provided with rolling ball pockets 31, the rolling ball pockets 31 are arranged in multiple in the circumferential direction of the retainer 3, the outer race 1, the inner race 2 and the rolling ball pockets 31 form a first space for accommodating the rolling balls 4, an isolation lubricating layer 32 is arranged on the inner wall of the rolling ball pockets 31, the hardness of the rolling balls 4 is greater than the hardness of the isolation lubricating layer 32. The outer circumferential surface of the retainer 3 is provided with lubricating ball pockets 33, the lubricating ball pockets 33 are arranged in multiple in the circumferential direction of the retainer 3, the outer race 1 and the lubricating ball pockets 33 form a second space for accommodating the lubricating balls 5.

[0049] It should be emphasized that the bearing of the present application is suitable for impact load scenarios under low-speed intermittent high-temperature and radiation-resistant working conditions. The bearing of the present application has excellent comprehensive performance, i.e. high-temperature resistance, radiation resistance, wear resistance, impact resistance, high precision, dynamic compensation and continuous solid transfer lubrication, through material combination and preparation.

[0050] In a preferred embodiment, the rolling ball pockets 31 are arranged in two groups respectively at both sides of the retainer 3 in the axial direction, and the inner races 2 are arranged in two groups respectively at both sides of the outer race 1 in the axial direction, and the two groups of inner races 2 correspond to the two groups of rolling ball pockets 31 one by one.

[0051] The following content corresponds to the number of each set of bearing structure: 11 outer races, 22 inner races, 31 retainers, a plurality of rolling balls 4 and a plurality of lubricating balls 5.

[0052] Under normal working conditions, one inner race 2 forms a contact rolling fit with one group of rolling balls 4 on the left side of the inner hole of the outer race 1, and the other inner race 2 forms a contact rolling fit with the rolling balls 4 on the right side of the inner hole of the outer race 1. Further, the number of rolling balls 4 in the bearing is different according to the specific working conditions of the bearing, and a typical value provided by the present application is 15x2=30 (2 rows of rolling balls 4). The number of lubricating balls 5 is determined according to the structure distribution of the retainer 3, and generally refers to the number of rolling balls 4, and a feasible typical value provided by the present application is 15, which is generally determined according to design calculation and stress analysis. It should be emphasized that the present application does not specifically limit the number of rolling balls 4 and the number of lubricating balls 5.

[0053] In a preferred embodiment, in the direction along the circumference of the retainer 3, the rolling ball pockets 31 and the lubricating ball pockets 33 are arranged in a staggered manner.

[0054] Specifically, as shown in FIG. 3, FIG. 4 and FIG. 5, the outer shape of the outer ring 1 is a circular ring shape, the outer ring 1 is a smooth cylindrical surface, and the inner wall of the inner hole of the outer ring 1 is machined with a first coupling inclined surface 11 and a first raceway 12. Specifically, the axial side surface of the outer ring 1 is provided with the first coupling inclined surface 11. The first raceway 12 is provided with two parallel raceways, and the two first raceways 12 are distributed on the left and right sides of the inner hole of the outer ring 1, symmetrically arranged, and the first raceway 12 is wrapped around the inner hole of the outer ring 1. The cross-sectional shape of the first raceway 12 on the axis of the outer ring 1 is a circular arc. More specifically, the radius of the first raceway 12 is greater than the radius of the rolling ball 4, so as to ensure that the rolling ball 4 and the first raceway 12 are single-point contact, and the micro-contact state of the rolling ball 4 and the first raceway 12 is elliptical elastic contact. The first coupling inclined surface 11 is arranged at the opening of the inner hole of the outer ring 1, and the first coupling inclined surface 11 is at a certain angle with the axis of the outer cylindrical surface of the outer ring 1.

[0055] The outer ring 1 includes an impact-resistant outer ring body and a wear-resistant isolation layer, and the isolation layer covers the first raceway 12, the first coupling inclined surface 11 and extends to the end face area of the outer ring body. More specifically, the outer ring 1 is composed of an outer ring body and an isolation layer, the isolation layer of the outer ring 1 is located inside the outer ring 1 body, and the isolation layer of the outer ring 1 contains the first raceway 12, the first coupling inclined surface 11 and extends to the end face area. The isolation layer of the outer ring 1 is made of wear-resistant material, which has high hardness and high strength. The preparation method of the isolation layer of the outer ring 1 mainly includes laser cladding, additive manufacturing, etc. The outer ring 1 body contains the part except the isolation layer of the outer ring 1. The outer ring 1 body is made of a tough material that meets the impact requirements, and takes into account the strength requirements under the design working condition. The outer ring 1 body should have enough shape allowance before the isolation layer is prepared, in order to offset the thermal and stress deformation caused by the preparation process.

[0056] The bearing outer ring 1 uses high-temperature-resistant bearing steel as the body, has high structural toughness, is impact-resistant, and is provided with an isolation strengthening layer at the raceway and sliding coupling position, so as to ensure its wear resistance under harsh operating conditions.

[0057] More specifically, as shown in FIG. 3 and FIG. 6, the outer shape of the inner ring 2 is a circular ring shape, and the inner hole is a smooth cylindrical surface. The inner ring 2 includes an outer circular portion and a cylindrical portion, and the diameter of the cylindrical portion is smaller than that of the outer circular portion. The outer circular portion of the inner ring 2 is provided with a second coupling inclined surface 21, and the second coupling inclined surface 21 is at a certain angle with the axis of the inner ring 2. The first coupling inclined surface 11 and the second coupling inclined surface 21 are coupled. The outer wall at the junction of the outer circular portion and the cylindrical portion of the inner ring 2 is provided with a second raceway 22, and the rolling ball 4 and the second raceway 22 are single-point contact. The micro-contact state of the rolling ball 4 and the second raceway 22 is elliptical elastic contact.

[0058] The second raceway 22 is arranged on the inner ring 2, surrounds the outer cylindrical surface of the inner ring 2, and has a circular arc cross section along the axis of the inner ring 2. The radius of the second raceway 22 is greater than the radius of the rolling ball 4, so that the rolling ball 4 is in single-point contact with the circular arc raceway, and the microscopic contact state is an elliptical elastic contact.

[0059] The outer surface of the cylindrical portion of the inner ring 2 is a sliding friction surface. The inner ring 2 comprises, in sequence along the axial direction, an outer cylindrical surface, the second raceway 22, and the sliding friction surface. The sliding friction surface is in sliding contact with the outer ring 1 and / or the retainer 3. As the bearing rolls and wears and the clearance changes, the initial clearance of the sliding friction surface decreases, and when the wear reaches the contact, the bearing is in mixed sliding and rolling friction transmission at this time. At the same time, the solid lubricant in the retainer 3 continuously and stably precipitates, and at the same time, the rolling and sliding surfaces are lubricated. In the steady state working condition of low speed and high temperature, it has stable and continuous working capacity.

[0060] The inner ring comprises an impact-resistant inner ring body and a wear-resistant isolation layer. The isolation layer covers the second raceway 22 and the sliding friction surface and extends to the end face area of the inner ring body. The inner ring 2 is composed of the inner ring body and the isolation layer. The isolation layer of the inner ring 2 covers the second raceway 22, the sliding friction surface, and extends to the end face area. The isolation layer of the inner ring 2 is made of wear-resistant material and has high hardness and strength. The preparation method of the isolation layer of the inner ring 2 mainly includes laser cladding and additive manufacturing. The inner ring 2 body is made of a tough material that meets the impact requirements and takes into account the strength requirements under the design working condition. The inner ring 2 body should have sufficient shape allowance before the isolation layer is prepared to offset the thermal and stress deformation caused by the preparation process. The outer cylindrical surface of the inner ring 2 is provided with a flow guide hole 23 that connects the internal space of the bearing and the external space of the bearing.

[0061] The inner ring 2 and the outer ring 1 can be meshed by locking the edge, lubricated by solid transfer lubrication, achieve low friction coefficient sliding friction, and realize dynamic compensation of rolling and sliding. The flow guide hole 23 arranged on the inner ring 2 enables the bearing to have appropriate chip removal function.

[0062] Specifically, as shown in FIGS. 3, 7, 8, and 9, the outer shape of the retainer 3 is annular. The retainer 3 is provided with a plurality of pockets. The pockets on the retainer 3 include rolling ball pockets 31 and lubricating ball pockets 33. Two rows of rolling ball pockets 31 are arranged on the retainer 3. Preferably, the number of rolling ball pockets 31 in the two rows is the same. The two rows of rolling ball pockets 31 are respectively arranged on the left and right sides of the retainer 3 in the axial direction. The two rolling ball pockets 31 are symmetrically arranged and surround the circumferential direction of the retainer 3.

[0063] The shape of the rolling ball pocket 31 is an open cylindrical structure, that is, the cylindrical surface of the rolling ball pocket 31 is discontinuous, and one side is an open ring. The rolling ball pocket 31 is matched with the rolling ball 4 during assembly, the retainer 3 is coupled by the contact between the surface of the rolling ball pocket 31 and the outer surface of the rolling ball 4, and as the rolling ball 4 rolls in the first raceway 12 and the second raceway 22, the rolling ball pocket 31 of the retainer 3 rotates in the circumferential direction under the action of the contact stress of the rolling ball 4. The inner wall of the rolling ball pocket 31 and the rolling ball 4 are in point contact, and the rolling ball 4 and the rolling ball pocket 31 are in clearance fit. Under the working condition of the bearing, the rolling ball 4 collides and contacts in the rolling ball pocket 31 of the retainer 3, the mass center trajectory of the rolling ball 4 is easy to control under the condition of small clearance fit, and the impact force can be effectively controlled, so that the contact stress is optimized.

[0064] The lubricating ball pocket 33 is distributed at the center position of the outer circular surface of the retainer 3, and the number is consistent with that of the single-row rolling ball pocket 31 along the circumference. The structural feature of the lubricating ball pocket 33 is that the initial section is a cylinder, the bottom is a spherical surface, and the diameter of the spherical surface is matched with the diameter of the lubricating ball 5. The lubricating ball pocket 33 is matched with the lubricating ball 5, which varies according to different operating media. In water medium, the graphite material lubricating ball 5 can be matched with the lubricating ball pocket 33 in an interference state, that is, the graphite lubricating ball 5 is tightly matched with the lubricating ball pocket 33 by pressing, and the powder stripped from the graphite solid lubricating ball 5 diffuses and adheres to the bearing rolling ball 4 to achieve lubrication. In the gas medium, small clearance fit can be used. The lubricating ball 5 generates friction with the lubricating ball pocket 33 during the operation of the retainer 3, and the powder stripped therefrom not only lubricates itself but also diffuses to the rolling ball 4 and the raceway of the retainer 3 through the gap between the retainer 3 and the ring to achieve transfer lubrication. Further, the retainer 3 is provided with a hole communicating the sliding friction surface and the lubricating ball pocket 33.

[0065] The retainer 3 is composed of a retainer body and a separation layer. It should be noted that the material hardness of the separation lubricating layer 32 provided on the inner wall of the rolling ball pocket 31 is slightly lower than that of the retainer 3 body and lower than that of the rolling ball 4. The separation lubricating layer 32 contacts the rolling ball 4 in a random manner during the operation of the bearing, that is, there can be two states of contact and no contact between the rolling ball 4 and the separation lubricating layer 32, which can prevent the separation lubricating layer 32 from being consumed too quickly and causing the bearing to fail.

[0066] The isolated lubricating layer 32 is in contact with the rolling ball 4. During the operation of the bearing, when in contact, the hardness of the rolling ball 4 is higher than that of the isolated lubricating layer 32. After the partial material powder of the isolated lubricating layer 32 is peeled off, it is attached to the surface of the rolling ball 4 and carried to the raceway of the inner and outer rings 1, thereby lubricating the rolling ball 4 and the raceway. The isolated lubricating layer 32 is prepared by mixing a certain strength material and a lubricating material, and has certain strength and lubricating performance. The appropriate strength can control the consumption rate of the lubricating layer, and the lubricating phase can be used for lubricating the bearing. The preparation method of the isolated lubricating layer 32 mainly includes laser cladding and additive manufacturing.

[0067] The side of the cage 3 pocket hole is also provided with a laser cladding lubricating isolated layer. The isolated layer here is different from the isolated layer of the ring. The main function of the isolated layer of the cage 3 is not to improve the wear resistance. The isolated layer of the pocket hole is mainly divided into three layers. The bonding layer combined with the base body is mainly to improve the bonding force. The outer layer is a reinforcing layer, which is mainly to improve the strength and prevent corrosion and disintegration during long-term use. The outermost layer is a lubricating layer, which mainly adopts a composite layer of reinforcing and lubricating phases to ensure that it has lubricating function and medium wear resistance. The ratio of the reinforcing phase and the lubricating phase is determined through tests. The lubricating phase is not wear-resistant and is easily consumed too fast, so it needs to be neutralized by the reinforcing phase to adjust the wear rate.

[0068] The hardness of the cage 3 is lower than that of the rolling ball 4, so as to ensure the integrity and wear resistance of the rolling ball 4 when it is in contact with the rolling ball 4. The hardness of the cage 3 is greater than that of the lubricating ball 5. Before the isolated layer is prepared, the cage 3 should have sufficient shape allowance to offset the deformation caused by heating and stress during the preparation process.

[0069] The cage 3 is placed between the double half inner rings and guided by the rolling ball 4, so as to avoid being stuck under the impact load of the bearing. The isolated lubricating layer 32 of the cage 3 can also lubricate the rolling ball 4, and the powder of the lubricating ball 5 installed in the cage 3 can also be used for lubrication. The material of the cage 3 has a small hardness difference with the rolling ball 4. The rolling ball pocket 31 adopts an open structure, and the other side leaves space for the inner ring 2. The cage 3 is provided with the isolated lubricating layer 32 and the lubricating ball pocket 33, and has a solid transfer lubrication function.

[0070] In order to facilitate understanding, the technical scheme of the application provides a feasible implementation manner:

[0071] The bearing structure comprises an outer ring 1, two inner rings 2 of the same structure, one retainer 3, 30 rolling balls 4 and 15 lubricating balls 5. The first raceway 12 on the left side of the outer ring 1, the second raceway 22 and the rolling ball pockets 31 on the left side of the retainer 3 cooperatively accommodate 15 rolling balls 4. The first raceway 12 on the right side of the outer ring 1, the second raceway 22 and the rolling ball pockets 31 on the right side of the retainer 3 cooperatively accommodate 15 rolling balls 4. The 15 lubricating ball pockets 33 in the middle of the retainer 3 accommodate 15 lubricating balls 5.

[0072] The flow guide hole 23 on the inner ring 2 allows the design to be in an inclined form according to the axial rotation direction and the flow guide requirement, that is, the hole axis has a certain inclination with the bearing end face, and the inclination size also needs to be different according to the specific function. In the embodiment, the typical bearing inclination is 90°, which is suitable for general working conditions such as flow guide and chip removal. If the speed is increased or cooling is required, the inner ring 21 can be designed to have a positive inclination, and the inner ring 22 can be designed to have a negative inclination, so as to optimize the flow channel of the bearing in the rotating working condition and strengthen the cooling.

[0073] The application also provides a manufacturing method of the solid transfer lubrication mixed transmission bearing.

[0074] The lubricating balls 5 are sequentially arranged in the lubricating ball pockets 33 of the retainer 3, the retainer 3 is inserted into the inner hole of the outer ring 1, the rolling balls 4 are sequentially arranged from one side of the inner hole of the outer ring 1, then the inner ring 2 is arranged, and the installation of one side of the bearing is completed.

[0075] The rolling balls 4 are sequentially arranged from the other side of the inner hole of the outer ring 1, then the inner ring 2 is arranged, and the installation of both sides of the bearing is completed.

[0076] After the installation is completed, the inner ring 2 is fixed by the rotating shaft, the end face is pressed, the axial and radial clearances of the outer ring 1 are measured, the measured clearances are compared with the designed clearances, the contact surface of the inner ring 2 is ground, and the clearance value of the bearing is adjusted to the designed value.

[0077] It should be noted that the bearing and the external components have various installation modes, and a typical mode is that the outer ring 1 is installed in a bearing support seat, the end face is fixed by a bearing pressing cover, the inner ring 2 is installed on a rotating shaft, and the rotating shaft is locked by a round nut and a gasket.

[0078] In the description of the present application, it should be understood that the orientations or positional relationships indicated by the terms “upper”, “lower”, “front”, “rear”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inner”, “outer” and the like are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present application.

[0079] The specific embodiments of the present application have been described. It is to be understood that the application is not limited to particular details described herein and that various modifications can be made therein without departing from the scope of the claimed application. Embodiments and features disclosed in this document, including in the examples, can be combined with each other, unless specifically contradicted by or inconsistent with each other.

Claims

1. A solid transfer lubricating hybrid transmission bearing characterized by, It comprises an outer race (1), an inner race (2), a retainer (3), rolling balls (4) and lubricating balls (5), the retainer (3) is arranged between the outer race (1) and the inner race (2); At least one side of the retainer (3) in the axial direction is provided with rolling ball pockets (31), a plurality of rolling ball pockets (31) are arranged circumferentially along the retainer (3), the outer race (1), the inner race (2) and the rolling ball pockets (31) form a first space for accommodating the rolling balls (4), the inner wall of the rolling ball pocket (31) is provided with a lubricating layer (32), the hardness of the rolling ball (4) is greater than the hardness of the lubricating layer (32); The outer circular surface of the retainer (3) is provided with lubricating ball pockets (33), a plurality of lubricating ball pockets (33) are arranged circumferentially along the retainer (3), the outer race (1) and the lubricating ball pockets (33) form a second space for accommodating the lubricating balls (5).

2. The solid transfer lubricating hybrid bearing of claim 1, wherein, The rolling ball pockets (31) are arranged in two groups respectively on both sides of the retainer (3) in the axial direction, the inner races (2) are arranged in two groups respectively on both sides of the outer race (1) in the axial direction, and the two groups of inner races (2) correspond to the two groups of rolling ball pockets (31) one by one.

3. The solid transfer lubricating hybrid bearing of claim 1, wherein, In the circumferential direction of the retainer (3), the rolling ball pockets (31) and the lubricating ball pockets (33) are arranged in an alternating manner.

4. The solid transfer lubricating hybrid bearing of claim 1, wherein, The side surface of the outer race (1) in the axial direction is provided with a first coupling inclined surface (11), the outer circular surface of the inner race (2) is provided with a second coupling inclined surface (21), and the first coupling inclined surface (11) is coupled with the second coupling inclined surface (21).

5. The solid transfer lubricating hybrid bearing of claim 1, wherein, The rolling ball (4) and the inner wall of the rolling ball pocket (31) are in point contact, and the rolling ball (4) and the rolling ball pocket (31) are in clearance fit; The inner wall of the outer race (1) is provided with a first raceway (12), the rolling ball (4) and the first raceway (12) are in single-point contact, and the micro-contact state between the rolling ball (4) and the first raceway (12) is elliptical elastic contact; The outer wall of the inner race (2) is provided with a second raceway (22), the rolling ball (4) and the second raceway (22) are in single-point contact, and the micro-contact state between the rolling ball (4) and the second raceway (22) is elliptical elastic contact.

6. The solid transfer lubricating hybrid bearing of claim 1, wherein, The inner race (2) comprises an outer circular surface, a second raceway (22) and a sliding friction surface arranged in sequence in the axial direction, the sliding friction surface is in sliding contact with the outer race (1) and / or the retainer (3), and the retainer (3) is provided with a channel communicating the sliding friction surface and the lubricating ball pocket (33); The outer circular surface of the inner race (2) is provided with a flow guide hole (23), and the flow guide hole (23) communicates the inner space of the bearing and the outer space of the bearing.

7. The solid transfer lubricating hybrid bearing of claim 1, wherein, The outer race (1) comprises an impact-resistant outer race body and a wear-resistant isolation layer, the isolation layer covers the first raceway (12) and the first coupling inclined surface (11) and extends to the end surface area of the outer race body. The inner race (2) comprises an impact-resistant inner race body and a wear-resistant isolation layer, the isolation layer covering the second raceway (22), the sliding friction surface and extending to the end face area of the inner race body; The cage (3) comprises an impact-resistant cage body and an isolation layer, the isolation layer comprising a bonding layer, a reinforcing layer and a lubricating layer in sequence.

8. The solid transfer lubricating hybrid bearing of claim 1, wherein, The hardness of the cage (3) is lower than that of the rolling ball (4), and the hardness of the cage (3) is greater than that of the lubricating ball (5).

9. A method of manufacturing a solid transfer lubricated hybrid transmission bearing, characterized by, The manufacturing method comprises: The lubricating ball (5) is sequentially loaded into the lubricating ball pocket (33) of the cage (3), the cage (3) is inserted into the inner hole of the outer race (1), the rolling ball (4) is sequentially loaded from one side of the inner hole of the outer race (1), then the inner race (2) is loaded, and the installation of one side of the bearing is completed; The rolling ball (4) is sequentially loaded from the other side of the inner hole of the outer race (1), then the inner race (2) is loaded, and the installation of both sides of the bearing is completed.

10. The method of claim 9, wherein the solid transfer lubricating hybrid bearing is manufactured by the steps of: After the installation is completed, the inner race (2) is fixed with the rotating shaft, the end face is pressed, the axial and radial clearances of the outer race (1) are measured, and the clearances are compared with the designed clearances, the contact surface of the inner race (2) is ground, and the clearance value of the bearing is adjusted to the designed value.

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