Solid transfer lubrication hybrid drive bearing and method of manufacture

Abstract

The invention provides a solid transfer lubrication hybrid transmission bearing and a manufacturing method, the solid transfer lubrication hybrid transmission bearing comprises an outer ferrule, an inner ferrule, a retainer, rolling balls and lubricating balls, the retainer is arranged between the outer ferrule and the inner ferrule; a plurality of rolling ball pockets are formed in at least one axial side of the retainer, the rolling ball pockets are arranged in the circumferential direction of the retainer, the outer ferrule, the inner ferrule and the rolling ball pockets form a first space for containing rolling balls, and an isolation lubricating layer is arranged on the inner wall of each rolling ball pocket. The hardness of the rolling ball is greater than that of the isolation lubricating layer; a plurality of lubricating ball pockets are formed in the outer circle face of the retainer in the circumferential direction of the retainer, and a second space for containing lubricating balls is formed by the outer ferrule and the lubricating ball pockets. The double lubricating effect is achieved, the solid transfer lubricating phase is used for lubricating, sliding friction with the low friction coefficient can be achieved, and dynamic compensation of rolling and sliding can also be achieved.

Description

Technical Field

[0001] The invention relates to the technical field of bearing structure design, and in particular to a solid transfer lubrication hybrid transmission bearing and a manufacturing method thereof. Background Art

[0002] The use environment of bearings includes but is not limited to high temperature, high pressure, specific media (water, inert gas, metal solution), impact, etc. The main functions of bearings are support and transmission, and they must meet the requirements of service life, transmission accuracy, intermittent operation, etc. under the above working conditions.

[0003] Bearings in the prior art are generally composed of rings, rolling elements, cages, etc. The materials of the rings and rolling elements are high-temperature bearing steel, heat-resistant alloy steel, stainless bearing steel, ceramics, etc. (typical materials include G95Cr18 series, GH05, Cr14Mo4V), and cages are generally made of metal, engineering plastics, etc. The above-mentioned prior art bearings can only be used alone under certain working conditions. Limited by the characteristics of the material's own performance, impact resistance requires high toughness, and wear resistance requires the material to have high hardness and high strength at high temperatures; in order to meet the operating life requirements of the bearing, under oil-free lubrication conditions, coating and solid transfer lubrication are required to lubricate the raceways and rolling elements to reduce the friction coefficient.

[0004] It is difficult for bearings in the prior art to simultaneously meet the requirements of high temperature resistance, radiation resistance, corrosion resistance, impact resistance, wear resistance, high precision, long life, and oil-free lubrication, and there is room for improvement. Summary of the invention

[0005] In view of the defects in the prior art, an object of the present invention is to provide a solid transfer lubrication hybrid transmission bearing and a manufacturing method thereof.

[0006] A solid transfer lubrication hybrid transmission bearing provided by the present invention comprises an outer ring, an inner ring, a retaining frame, rolling balls and lubricating balls, wherein the retaining frame is arranged between the outer ring and the inner ring;

[0007] A rolling ball pocket is provided on at least one side of the cage in the axial direction, and a plurality of the rolling ball pockets are arranged along the circumferential direction of the cage. The outer ring, the inner ring and the rolling ball pocket form a first space for accommodating a rolling ball. An isolation lubricating layer is provided on the inner wall of the rolling ball pocket, and the hardness of the rolling ball is greater than the hardness of the isolation lubricating layer.

[0008] The outer circumferential surface of the retaining frame is provided with a lubricating ball pocket hole, and a plurality of the lubricating ball pocket holes are arranged along the circumferential direction of the retaining frame. The outer ring and the lubricating ball pocket holes together form a second space for accommodating the lubricating ball.

[0009] Preferably, a group of rolling ball pockets are respectively arranged on both sides of the retaining frame in the axial direction, and a group of inner rings are respectively arranged on both sides of the outer ring in the axial direction, and the two groups of inner rings correspond one by one to the two groups of rolling ball pockets respectively.

[0010] Preferably, the rolling ball pocket holes and the lubricating ball pocket holes are arranged alternately and at intervals along the circumference of the retaining frame.

[0011] Preferably, a first coupling bevel is provided on the axial side surface of the outer ferrule, and a second coupling bevel is provided on the outer circumference of the inner ferrule, and the first coupling bevel is coupled to the second coupling bevel.

[0012] Preferably, the rolling ball is in point contact with the inner wall of the rolling ball pocket, and the rolling ball is in clearance fit with the rolling ball pocket;

[0013] A first raceway is arranged on the inner wall of the outer ring, the rolling ball and the first raceway are in single-point contact, and the microscopic contact state between the rolling ball and the first raceway is an elliptical elastic contact;

[0014] A second raceway is arranged on the outer wall of the inner ring, the rolling ball is in single-point contact with the second raceway, and the microscopic contact state between the rolling ball and the second raceway is an elliptical elastic contact.

[0015] Preferably, the inner ring includes an outer circle, a second raceway and a sliding friction surface arranged in sequence along the axial direction. The sliding friction surface is in sliding contact with the outer ring and / or the retaining frame. This sliding contact state and the contact state of the inner ring, the outer ring and the steel ball under normal operation of the bearing produce a mutual compensation effect as the bearing wears during operation. The sliding contact surface can be adjusted to contact with a smooth cylindrical hole and a smooth cylindrical shaft with an intermittent isolation layer. The retaining frame is provided with a channel connecting the sliding friction surface and the lubrication ball pocket hole; a guide hole is provided on the outer circle of the inner ring, and the guide hole connects the internal space of the bearing and the external space of the bearing.

[0016] Preferably, the outer ring comprises an impact-resistant outer ring body and a wear-resistant isolation layer, wherein the isolation layer covers the first raceway and the first coupling slope and extends to the end surface area of ​​the outer ring body;

[0017] The inner ring comprises an impact-resistant inner ring body and a wear-resistant isolation layer, wherein the isolation layer covers the second raceway and the sliding friction surface and extends to the end surface area of ​​the inner ring body;

[0018] The retainer comprises an impact-resistant retainer body and an isolation layer, wherein the isolation layer comprises a bonding layer, a strengthening layer and a lubricating layer which are sequentially arranged and combined with a substrate.

[0019] Preferably, the hardness of the retaining frame is lower than the hardness of the rolling ball, and the hardness of the retaining frame is greater than the hardness of the lubricating ball.

[0020] According to a method for manufacturing a solid transfer lubrication hybrid transmission bearing provided by the present invention, the manufacturing method comprises:

[0021] Install the lubricating balls into the lubricating ball pockets of the cage in sequence, insert the cage into the inner hole of the outer ring, install the rolling balls from one side of the inner hole of the outer ring in sequence, and then install the inner ring to complete the installation of one side of the bearing;

[0022] Install the rolling balls from the other side of the inner hole of the outer ring, and then install the inner ring to complete the installation of both sides of the bearing.

[0023] Preferably, after installation, the inner ring is fixed with a rotating shaft, the end face is pressed, the axial and radial clearances of the outer ring are measured, compared with the designed clearances, and the bearing clearance value is adjusted to the designed value by grinding the contact surface of the inner ring.

[0024] Compared with the prior art, the present invention has the following beneficial effects:

[0025] 1. The present invention provides an isolation lubrication layer at the rolling ball pocket and a lubrication ball on the outer cylindrical surface of the cage, so that lubrication is provided on the side of the cage and in the middle of the outer cylindrical surface of the cage respectively, which has a double lubrication effect and realizes lubrication by solid transfer lubrication phase, can achieve sliding friction with a low friction coefficient, and can realize dynamic compensation of rolling and sliding.

[0026] 2. The present invention adopts double semi-inner rings as the inner ring, so as to realize the installation of rolling elements without gaps and ensure the consistency of the bearing rings. The integral inner ring cannot complete the installation of rolling elements and internal retaining frames without a gap. The outer ring adopts an integrated outer ring, and does not use two rings to cooperate with the inner ring respectively, mainly to ensure the integrity of the boundary, and the retaining frame is encapsulated inside to form a semi-sealed cavity, which can increase the lubrication effect of transfer lubrication.

[0027] 3. The present invention provides a guide hole on the outer circle of the inner ring, the guide hole connects the inner space of the bearing and the outer space of the bearing. The guide hole provided on the inner ring enables the bearing to have an appropriate chip removal function. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Other features, objects and advantages of the present invention will become more apparent from the detailed description of non-limiting embodiments made with reference to the following drawings:

[0029] Figure 1 This is a schematic diagram mainly showing the overall structure of the bearing of the present invention;

[0030] Figure 2 This is a cross-sectional view mainly showing the overall structure of the bearing of the present invention;

[0031] Figure 3 This is an exploded view of the overall structure of the bearing mainly embodied in the present invention;

[0032] Figure 4 This is a schematic axial view of the overall structure of the outer ring of the present invention;

[0033] Figure 5 This is a cross-sectional view mainly showing the overall structure of the outer ring of the present invention;

[0034] Figure 6 This is a schematic diagram mainly showing the overall structure of the inner ferrule of the present invention;

[0035] Figure 7 This is an axial schematic diagram mainly showing the overall structure of the cage of the present invention;

[0036] Figure 8 It is a side schematic diagram mainly showing the overall structure of the cage of the present invention;

[0037] Fig. 9 This is a cross-sectional view mainly showing the overall structure of the retainer of the present invention.

[0038] As shown in the figure:

[0039] Outer ring 1 Cage 3

[0040] First coupling slope 11 Rolling ball pocket 31

[0041] First raceway 12 Isolation lubrication layer 32

[0042] Inner ring 2 Lubrication ball pocket hole 33

[0043] Second coupling slope 21 Rolling ball 4

[0044] Second raceway 22 Lubricating ball 5

[0045] Diversion hole 23 DETAILED DESCRIPTION

[0046] The present invention is described in detail below in conjunction with specific embodiments. The following embodiments will help those skilled in the art to further understand the present invention, but are not intended to limit the present invention in any form. It should be noted that, for those of ordinary skill in the art, several changes and improvements can also be made without departing from the concept of the present invention. These all belong to the protection scope of the present invention.

[0047] like Figure 1 , Figure 2 as well as Figure 3As shown, a solid transfer lubrication hybrid transmission bearing provided by the present invention comprises an outer ring 1, an inner ring 2, a retainer 3, a rolling ball 4 and a lubricating ball 5, wherein the retainer 3 is disposed between the outer ring 1 and the inner ring 2. A rolling ball pocket hole 31 is provided on at least one side of the axial direction of the retainer 3, and a plurality of rolling ball pocket holes 31 are arranged along the circumference of the retainer 3. The outer ring 1, the inner ring 2 and the rolling ball pocket holes 31 form a first space for accommodating the rolling ball 4, and an isolation lubricating layer 32 is provided on the inner wall of the rolling ball pocket hole 31, and the hardness of the rolling ball 4 is greater than the hardness of the isolation lubricating layer 32. A lubricating ball pocket hole 33 is provided on the outer circumferential surface of the retainer 3, and a plurality of lubricating ball pocket holes 33 are arranged along the circumference of the retainer 3, and the outer ring 1 and the lubricating ball pocket holes 33 form a second space for accommodating the lubricating ball 5.

[0048] It should be emphasized that the bearings of this application are suitable for low-speed intermittent high-temperature and radiation-resistant working conditions under impact loads. The bearings of this application have excellent comprehensive performance under harsh working conditions through material combination and preparation, namely, high-temperature resistance, radiation resistance, wear resistance, impact resistance, high precision, dynamic compensation, and continuous solid transfer lubrication.

[0049] In a preferred embodiment: a group of rolling ball pockets 31 are respectively arranged on both sides of the retaining frame 3 in the axial direction, and a group of inner rings 2 are respectively arranged on both sides of the outer ring 1 in the axial direction, and the two groups of inner rings 2 correspond to the two groups of rolling ball pockets 31 one by one.

[0050] The following contents are based on the quantities corresponding to each set of bearing structures: 11 outer rings, 22 inner rings, 31 retainers, 4 rolling balls, and 5 lubricating balls.

[0051] Under normal working conditions, one inner ring 2 forms a contact rolling fit with a group of rolling balls 4 on the left side of the inner hole of the outer ring 1, and the other inner ring 2 forms a contact rolling fit with the rolling balls 4 on the right side of the inner hole of the outer ring 1. Furthermore, the number of rolling balls 4 in the bearing composition varies according to the specific working conditions of the bearing. This application provides a typical value of 15×2=30 (2 rows of rolling balls 4). The number of lubricating balls 5 is determined according to the structural distribution of the retaining frame 3, and its number generally refers to the number of rolling balls 4. This application provides a feasible typical value of 15, which is generally determined based on design calculations and stress analysis. It should be emphasized that this application does not make specific restrictions on the number of rolling balls 4 and the number of lubricating balls 5.

[0052] In a preferred embodiment, the rolling ball pockets 31 and the lubricating ball pockets 33 are arranged alternately and at intervals along the circumference of the cage 3 .

[0053] Specifically, if Figure 3 , Figure 4 as well as Figure 5As shown, the outer ring 1 has an outer ring shape, and the outer ring 1 is a smooth cylindrical surface. The inner wall of the inner hole of the outer ring 1 is processed with a first coupling bevel 11 and a first raceway 12. Specifically, the axial side of the outer ring 1 is provided with a first coupling bevel 11. Two first raceways 12 are arranged side by side, and the two first raceways 12 are distributed on the left and right sides of the inner hole of the outer ring 1, and are arranged symmetrically. The first raceway 12 surrounds the inner hole of the outer ring 1, and the cross-sectional shape of the first raceway 12 on the axis of the outer ring 1 is an arc. More specifically, the radius of the first raceway 12 is greater than the radius of the rolling ball 4 to ensure that the rolling ball 4 is in single-point contact with the first raceway 12, and the microscopic contact state of the rolling ball 4 and the first raceway 12 is an elliptical elastic contact. The first coupling bevel 11 is arranged at the orifice of the inner hole of the outer ring 1, and the first coupling bevel 11 is at a certain angle to the axis of the outer cylindrical surface of the outer ring 1.

[0054] 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 bevel 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, and the isolation layer of the outer ring 1 is located inside the outer ring body 1, and the isolation layer of the outer ring 1 includes the first raceway 12, the first coupling bevel 11 and extends to the end face area. The isolation layer of the outer ring 1 is made of wear-resistant material and 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 includes a part other than the isolation layer of the outer ring 1. The outer ring 1 body is made of a tough material that meets the impact requirements, taking into account the strength requirements under the design conditions. Before preparing the isolation layer, the outer ring 1 body should have sufficient shape margin to offset the heat, force deformation, etc. caused by the preparation process.

[0055] The outer bearing ring 1 is made of high temperature resistant bearing steel as its main body, has high structural toughness and is impact resistant, and an isolation reinforcement layer is provided at the raceway and sliding coupling to ensure that it is wear resistant under harsh operating conditions.

[0056] More specifically, Figure 3 and Figure 6 As shown, the outer structure of the inner ring 2 is a ring shape, the inner hole is a smooth cylindrical surface, the inner ring 2 includes an outer circle part and a cylindrical part, the diameter of the cylindrical part is smaller than the diameter of the outer circle part, the outer circle of the inner ring 2 is provided with a second coupling inclined surface 21, the second coupling inclined surface 21 is at a certain angle with the axis of the inner ring 2, and the first coupling inclined surface 11 is coupled with the second coupling inclined surface 21. A second raceway 22 is provided on the outer wall of the junction of the outer circle part and the cylindrical part of the inner ring 2, the rolling ball 4 is in single-point contact with the second raceway 22, and the microscopic contact state of the rolling ball 4 and the second raceway 22 is an elliptical elastic contact.

[0057] The second raceway 22 is provided on the inner ring 2, and the second raceway 22 surrounds the outer circumferential surface of the inner ring 2. The cross-sectional shape of the second raceway 22 at the axis of the inner ring 2 is an arc. The radius of the second raceway 22 is greater than the radius of the rolling ball 4, so as to ensure that the rolling ball 4 and the arc raceway are in single-point contact, and the contact state under microscopic view is an elliptical elastic contact.

[0058] The outer surface of the cylindrical part of the inner ring 2 is a sliding friction surface. The inner ring 2 includes an outer circle, a second raceway 22 and a sliding friction surface arranged in sequence along the axial direction. The sliding friction surface is in sliding contact with the outer ring 1 and / or the retaining frame 3. As the bearing rolls and wears and the clearance changes, the initial clearance of the sliding friction surface changes from large to small. When it is worn to contact, the bearing is a mixed transmission of sliding friction and rolling friction. At the same time, the solid lubricant in the retaining frame 3 is continuously and stably precipitated, and the rolling and sliding surfaces are lubricated at the same time. Under steady-state conditions such as low speed and high temperature, it has stable and continuous working ability.

[0059] The inner ring includes an impact-resistant inner ring body and a wear-resistant isolation layer, the isolation layer covers the second raceway 22, the sliding friction surface and extends to the end face area of ​​the inner ring body. The inner ring 2 is composed of an inner ring body and an 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, additive manufacturing, etc. The inner ring 2 body is made of a tough material that meets the impact requirements, taking into account the strength requirements under the design conditions. Before preparing the isolation layer of the inner ring 2 body, sufficient shape margin should be left to offset the heat, force deformation, etc. caused by the preparation process. A guide hole 23 is provided on the outer circle of the inner ring 2, and the guide hole 23 connects the internal space of the bearing and the external space of the bearing.

[0060] The inner ring 2 and the outer ring 1 can be engaged by locking edges and lubricated by solid transfer lubrication phase, which can achieve sliding friction with low friction coefficient and dynamic compensation of rolling and sliding. The guide hole 23 provided on the inner ring 2 enables the bearing to have appropriate chip removal function.

[0061] Specifically, Figure 3 , Figure 7 , Figure 8 as well as Fig. 9 As shown, the outer shape of the retaining frame 3 is annular, and pockets are distributed on the retaining frame 3. The pockets on the retaining frame 3 include rolling ball pockets 31 and lubricating ball pockets 33. The rolling ball pockets 31 are arranged in two rows on the retaining frame 3. Preferably, the number of the two rows of rolling ball pockets 31 is the same. The two rows of rolling ball pockets 31 are respectively arranged on the left and right sides of the axial direction of the retaining frame 3. The two rolling ball pockets 31 are symmetrically arranged and surround the retaining frame 3 along the circumferential direction.

[0062] 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 loop. The rolling ball pocket 31 cooperates with the rolling ball 4 during assembly, and the retainer 3 realizes coupling through the contact between the rolling ball pocket 31 and the outer surface of the rolling ball 4. 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 contact stress of the rolling ball 4. The rolling ball 4 is in point contact with the inner wall of the rolling ball pocket 31, and the rolling ball 4 is in clearance fit with the rolling ball pocket 31. Under the operating condition of the bearing, the rolling ball 4 collides and contacts in the rolling ball pocket 31 of the retainer 3. The center of mass trajectory of the rolling ball 4 is easy to control under the small clearance fit, which can effectively control the impact force, thereby optimizing the contact stress.

[0063] The lubricating ball pocket holes 33 are distributed at the center of the outer cylindrical surface of the retainer 3, and the number is consistent with the single-row rolling ball pocket holes 31 along the circumference. The structural characteristics of the lubricating ball pocket holes 33 are that the initial segment 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 matching of the lubricating ball pocket holes 33 and the lubricating ball 5 varies according to different operating media. Under water medium, the lubricating ball 5 of graphite material can be matched with the lubricating ball pocket holes 33 in an interference state, that is, the graphite lubricating ball 5 is tightly matched with the lubricating ball pocket holes 33 by pressing. In the water medium, the powder peeled off from the graphite solid lubricating ball 5 diffuses and attaches to the bearing rolling ball 4 to achieve lubrication. Under gas medium, a small gap fit can be adopted. During the operation of the retainer 3, the lubricating ball 5 generates friction with the lubricating ball pocket holes 33. The peeled powder not only lubricates itself, but also diffuses to the rolling ball 4 and the raceway of the raceway through the gap between the retainer 3 and the raceway to achieve transfer lubrication. Furthermore, a channel connecting the sliding friction surface and the lubrication ball pocket hole 33 is provided on the retaining frame 3 .

[0064] The cage 3 is composed of a cage body and an isolation layer. It should be noted that the isolation lubricating layer 32 provided on the inner wall of the rolling ball pocket 31 has a material hardness slightly lower than that of the cage body 3 and also lower than that of the rolling ball 4. During the operation of the bearing, the isolation lubricating layer 32 contacts the rolling ball 4 in a random manner, that is, there may be two states where the rolling ball 4 contacts the isolation lubricating layer 32 or does not contact the isolation lubricating layer 32, which can prevent the isolation lubricating layer 32 from being consumed too quickly and causing the bearing to fail.

[0065] The isolation lubrication layer 32 is in contact with the rolling ball 4. During the operation of the bearing, when in contact, the rolling ball 4 has a higher hardness than the isolation lubrication layer 32. Part of the material powder of the isolation lubrication layer 32 is peeled off and attached to the surface of the rolling ball 4 and carried to the raceway of the inner and outer rings 1 to lubricate the rolling ball 4 and the raceway. The isolation lubrication layer 32 is prepared by mixing a certain strength material and a lubricating material, and has a certain strength and lubrication performance. The appropriate strength can control the consumption rate of the lubrication layer, and the lubricating phase can be used to lubricate the bearing. The preparation methods of the isolation lubrication layer 32 mainly include laser cladding, additive manufacturing, etc.

[0066] The side of the pocket of retainer 3 is also laser-claded with a lubricating isolation layer. The isolation layer here is different from the isolation layer of the ring. The main function of the isolation layer of retainer 3 is not to improve wear resistance. The isolation layer of the pocket is mainly divided into three layers. The bonding layer combined with the substrate is mainly used to improve the bonding strength. The outer layer is a strengthening layer, which is mainly used to improve its own strength to prevent corrosion and disintegration during long-term use. The outermost layer is a lubricating layer, which mainly uses a composite layer of strengthening and lubricating phases to ensure that it has both lubrication function and medium wear resistance. The ratio of the strengthening phase and the lubricating phase is determined by experiments. The lubricating phase is not wear-resistant and is easily consumed too quickly. It needs to be neutralized with a strengthening phase to adjust its wear rate.

[0067] The hardness of the cage 3 is lower than that of the rolling ball 4 to ensure the integrity and wear resistance of the rolling ball 4 when in contact with the rolling ball 4. The hardness of the cage 3 is greater than the hardness of the lubricating ball 5. Before preparing the isolation layer of the cage 3, sufficient shape margin should be left to offset the heat, force deformation, etc. caused by the preparation process.

[0068] The cage 3 is placed between the two semi-inner rings and guided by the rolling balls 4 to prevent the bearing from getting stuck under impact load. At the same time, the rolling balls 4 are lubricated by the isolation lubrication layer 32 of the cage 3, and can also be lubricated by the powder of the lubricating balls 5 installed in the cage 3. The material of the cage 3 and the rolling balls 4 have a small hardness difference, and the rolling ball pocket 31 adopts an open structure, leaving space for the inner ring 2 on the other side; the cage 3 is provided with an isolation lubrication layer 32 and a lubricating ball pocket 33, which has a solid transfer lubrication function.

[0069] For ease of understanding, the technical solution of this application provides a feasible implementation method:

[0070] The bearing structure includes an outer ring 1, two inner rings 2 of the same structure, a cage 3, 30 rolling balls 4 and 15 lubricating balls 5. The first raceway 12 and the second raceway 22 on the left side of the outer ring 1 and the rolling ball pocket 31 on the left side of the cage 3 cooperate to accommodate the 15 rolling balls 4. The first raceway 12 and the second raceway 22 on the right side of the outer ring 1 and the rolling ball pocket 31 on the right side of the cage 3 cooperate to accommodate the 15 rolling balls 4. The 15 lubricating ball pockets 33 in the middle of the cage 3 accommodate the 15 lubricating balls 5.

[0071] The guide hole 23 on the inner ring 2 is allowed to be designed as an inclined form according to the axial rotation direction and guide requirements, that is, there is a certain inclination angle between the hole axis and the bearing end face, and the size of the inclination angle must also be different according to the specific function. In this embodiment, the typical bearing inclination angle is 90°, which is suitable for guide and chip removal under normal working conditions. If the speed is increased or there is a cooling requirement, the inclination angle of the inner ring 2I can be set to positive and the inclination angle of the inner ring 2II can be set to negative, which can achieve optimization of the flow channel under the bearing rotation condition and enhance cooling.

[0072] The present invention also provides a method for manufacturing a solid transfer lubrication hybrid transmission bearing, which is used to manufacture the above-mentioned solid transfer lubrication hybrid transmission bearing. The manufacturing method comprises:

[0073] Install the lubricating balls 5 into the lubricating ball pockets 33 of the retaining frame 3 in sequence, insert the retaining frame 3 into the inner hole of the outer ring 1, install the rolling balls 4 from one side of the inner hole of the outer ring 1 in sequence, and then install the inner ring 2 to complete the installation of one side of the bearing.

[0074] Install the rolling ball 4 from the other side of the inner hole of the outer ring 1 in sequence, and then install the inner ring 2 to complete the installation of both sides of the bearing.

[0075] After installation, fix the inner ring 2 with a rotating shaft, press the end face, measure the axial and radial clearances of the outer ring 1, compare them with the designed clearance, and adjust the bearing clearance value to the designed value by grinding the contact surface of the inner ring 2.

[0076] It should be noted that there are many ways to install bearings and external components. A typical way is that the outer ring 1 is installed in the bearing support seat, the end face is clamped and fixed by the bearing cover, and the inner ring 2 is installed on the rotating shaft and locked by round nuts and washers.

[0077] In the description of the present application, it should be understood that the terms "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0078] The above describes the specific embodiments of the present invention. It should be understood that the present invention is not limited to the above specific embodiments, and those skilled in the art can make various changes or modifications within the scope of the claims, which does not affect the essence of the present invention. In the absence of conflict, the embodiments of the present application and the features in the embodiments can be combined with each other arbitrarily.

Claims

1. A solid transfer lubrication hybrid transmission bearing, characterized in that: It comprises an outer ring (1), an inner ring (2), a retaining frame (3), a rolling ball (4) and a lubricating ball (5), wherein the retaining frame (3) is arranged between the outer ring (1) and the inner ring (2); A rolling ball pocket (31) is provided on at least one side of the axial direction of the retaining frame (3), and a plurality of the rolling ball pockets (31) are arranged along the circumference of the retaining frame (3); the outer ring (1), the inner ring (2) and the rolling ball pocket (31) form a first space for accommodating a rolling ball (4); an isolation lubricating layer (32) is provided on the inner wall of the rolling ball pocket (31); and the hardness of the rolling ball (4) is greater than the hardness of the isolation lubricating layer (32); The outer circumferential surface of the retaining frame (3) is provided with a lubricating ball pocket hole (33), and a plurality of the lubricating ball pocket holes (33) are arranged along the circumference of the retaining frame (3). The outer ring (1) and the lubricating ball pocket holes (33) together form a second space for accommodating a lubricating ball (5).

2. The solid transfer lubrication hybrid transmission bearing according to claim 1, characterized in that: A group of rolling ball pocket holes (31) are respectively arranged on both sides of the retaining frame (3) in the axial direction, and a group of inner rings (2) are respectively arranged on both sides of the outer ring (1) in the axial direction. The two groups of inner rings (2) correspond to the two groups of rolling ball pocket holes (31) in a one-to-one manner.

3. The solid transfer lubrication hybrid transmission bearing according to claim 1, characterized in that: In the direction along the circumference of the retaining frame (3), the rolling ball pocket holes (31) and the lubricating ball pocket holes (33) are arranged alternately and at intervals.

4. The solid transfer lubrication hybrid transmission bearing according to claim 1, characterized in that: The outer ferrule (1) is provided with a first coupling bevel (11) on the axial side surface, and the inner ferrule (2) is provided with a second coupling bevel (21) on the outer circumference, and the first coupling bevel (11) is coupled with the second coupling bevel (21).

5. The solid transfer lubrication hybrid transmission bearing according to claim 1, characterized in that: 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; A first raceway (12) is arranged on the inner wall of the outer ring (1), the rolling ball (4) and the first raceway (12) are in single-point contact, and the microscopic contact state between the rolling ball (4) and the first raceway (12) is an elliptical elastic contact; A second raceway (22) is arranged on the outer wall of the inner ring (2), the rolling ball (4) and the second raceway (22) are in single-point contact, and the microscopic contact state between the rolling ball (4) and the second raceway (22) is an elliptical elastic contact.

6. The solid transfer lubrication hybrid transmission bearing according to claim 1, characterized in that: The inner ring (2) comprises an outer circle, a second raceway (22) and a sliding friction surface which are sequentially arranged along the axial direction, the sliding friction surface is in sliding contact with the outer ring (1) and / or the retaining frame (3), and the retaining frame (3) is provided with a channel connecting the sliding friction surface and the lubricating ball pocket hole (33); A flow guide hole (23) is provided on the outer circle of the inner ring (2), and the flow guide hole (23) communicates the internal space of the bearing with the external space of the bearing.

7. The solid transfer lubrication hybrid transmission bearing according to claim 1, characterized in that: The outer ring (1) comprises an impact-resistant outer ring body and a wear-resistant isolation layer, wherein the isolation layer covers the first raceway (12), the first coupling bevel (11) and extends to the end surface area of ​​the outer ring body; The inner ring (2) comprises an impact-resistant inner ring body and a wear-resistant isolation layer, wherein the isolation layer covers the second raceway (22), the sliding friction surface and extends to the end surface area of ​​the inner ring body; The retainer (3) comprises an impact-resistant retainer body and an isolation layer, wherein the isolation layer comprises a bonding layer, a strengthening layer and a lubricating layer which are sequentially arranged and combined with a substrate.

8. The solid transfer lubrication hybrid transmission bearing according to claim 1, characterized in that: The hardness of the retaining frame (3) is lower than the hardness of the rolling ball (4), and the hardness of the retaining frame (3) is greater than the hardness of the lubricating ball (5).

9. A method for manufacturing a solid transfer lubrication hybrid transmission bearing, characterized in that: The solid transfer lubrication hybrid transmission bearing according to any one of claims 1 to 8 is manufactured by a method comprising: Install the lubricating balls (5) into the lubricating ball pockets (33) of the retainer (3) in sequence, insert the retainer (3) into the inner hole of the outer ring (1), install the rolling balls (4) from one side of the inner hole of the outer ring (1) in sequence, and then install the inner ring (2) to complete the installation of one side of the bearing; Install the rolling ball (4) from the other side of the inner hole of the outer ring (1) in sequence, and then install the inner ring (2) to complete the installation of both sides of the bearing.

10. The method for manufacturing a solid transfer lubrication hybrid transmission bearing according to claim 9, characterized in that: After installation, fix the inner ring (2) with a rotating shaft, press the end face, measure the axial and radial clearances of the outer ring (1), compare them with the designed clearances, and adjust the bearing clearance value to the designed value by grinding the contact surface of the inner ring (2).

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