Thin-wall bearing retainer and thin-wall bearing
By designing balls and sockets of different sizes on thin-wall bearing cages, the balls can move more flexibly during the bearing rotation, solving the problem of ball stagnation of robot bearings and improving the flexibility and stability of the bearings.
Patent Information
- Application Number
- CN202421335652.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-12
- Publication Date
- 2025-02-18
- Estimated Expiration
- 2034-06-12
AI Technical Summary
In the joint parts of the robot bearing, the rolling element is prone to stagnation during the reciprocating transformation of the rotation direction, resulting in a reduction in the flexibility of the bearing.
A thin-walled bearing cage is designed, including a cage body with an annular structure, and a first ball and a second ball and a second ball and a circumferentially are provided. The width of the first ball and socket is greater than the width of the second ball and socket, so that the balls in the first ball and socket can rotate and move, providing a larger commutation space, reducing the contact area between the ball and the cage, reducing obstacles, and achieving flexibility touch.
It effectively alleviates the problem of ball stagnation, improves the flexibility of the bearing, and enables it to operate more stably in high speed and high flexibility environments.
Smart Images
Figure CN222502429U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of bearing processing, in particular to a thin-walled bearing retainer and a thin-walled bearing. Background Art
[0002] Bearing is an important component in modern mechanical equipment. Its main function is to support the mechanical rotating body, reduce the friction coefficient of the mechanical rotating body during movement, and ensure the rotation accuracy of the mechanical rotating body.
[0003] Thin-walled bearings are small, light, compact and stable bearing products, widely used in precision machinery, aerospace, automobiles, robots and other fields. Its structure mainly consists of inner ring, outer ring, rolling element and cage. Among them, the inner ring and outer ring are the main parts of the thin-walled bearing, and the rolling element rolls between the inner and outer rings. The function of the cage is to keep the position of the rolling element stable and separate the rolling elements to prevent them from colliding with each other.
[0004] The bearings of industrial robots are one of their key accessories. They are characterized by being able to withstand combined loads in axial, radial, and overturning directions. Therefore, they are most suitable for the joints or rotating parts of industrial robots, the rotary tables of machining centers, the rotating parts of manipulators, precision rotary tables, medical instruments, measuring instruments, and IC manufacturing equipment.
[0005] Robot bearings are generally used in joints, which require high-speed and flexible operation, so the requirements for bearings are higher.
[0006] Usually, the retaining frame is provided with a ball pocket (also called a ball socket), and the rolling body is confined in the ball pocket but can rotate inside the ball pocket. However, during the reciprocating conversion of the rotation direction of the joint, the bearing needs to continuously rotate forward and reverse, that is, the rotation direction of the rolling body keeps changing, which makes it easy for the rolling body to get stuck inside the ball pocket, resulting in reduced bearing flexibility.
[0007] Therefore, how to provide a thin-walled bearing cage that can alleviate the problem of rolling element sticking and meet the flexibility requirements is a technical problem that needs to be solved urgently by skilled technicians. Utility Model Content
[0008] In view of this, the utility model provides a thin-walled bearing cage, which can alleviate the problem of rolling element sticking to meet the flexibility requirements. In addition, the utility model also provides a thin-walled bearing having the thin-walled bearing cage.
[0009] In order to achieve the above purpose, the utility model provides the following technical solutions:
[0010] A thin-walled bearing retainer, comprising:
[0011] A cage body, the cage body is an annular structure, and a first ball socket and a second ball socket for accommodating balls are arranged along the circumference of the cage body, the first ball socket and the second ball socket are both open structures, and the width of the first ball socket along the circumference of the cage body is greater than the width of the second ball socket along the circumference of the cage body;
[0012] The ball in the second ball socket is rotatably arranged, and the ball in the first ball socket is rotatably and movably arranged.
[0013] Preferably, in the above-mentioned thin-walled bearing retainer, the first ball socket is a U-shaped groove structure, the opening of the first ball socket is located on the first side of the retainer body, and the groove bottom of the U-shaped groove smoothly transitions to the side wall of the U-shaped groove.
[0014] Preferably, in the above-mentioned thin-walled bearing retainer, the second ball socket comprises:
[0015] an arc groove, the opening of the arc groove facing the first side of the retainer body;
[0016] A guide groove is communicated with the opening of the circular arc groove, and the opening of the guide groove is located on the first side of the retainer body.
[0017] Preferably, in the above-mentioned thin-walled bearing retainer, the two opposite side walls of the guide groove are inclined surfaces, and the distance between the two side walls of the guide groove gradually increases from the arc groove toward the opening direction of the guide groove.
[0018] Preferably, in the above-mentioned thin-walled bearing retainer, the inclination angle of the two side walls of the guide groove relative to the axial direction of the retainer body is 10°-20°.
[0019] Preferably, in the above-mentioned thin-walled bearing retainer, along the axial direction of the retainer body, the height of the groove bottom of the first ball socket is the same as the height of the groove bottom of the arc groove of the second ball socket.
[0020] Preferably, in the above-mentioned thin-walled bearing retainer, the arc groove is a semicircular arc groove, and the width of the opening of the guide groove is equal to the diameter of the arc groove.
[0021] Preferably, in the above-mentioned thin-walled bearing retainer, the first ball socket and the second ball socket are arranged alternately, and the thickness of the wall beam between the first ball socket and the second ball socket is equal;
[0022] or,
[0023] The first ball sockets are arranged adjacent to each other and / or the second ball sockets are arranged adjacent to each other.
[0024] Preferably, in the above-mentioned thin-walled bearing cage, the cage body is a welded structure;
[0025] And / or, the retaining frame body is a copper structure.
[0026] A thin-walled bearing comprises a retaining frame, wherein the retaining frame is any one of the thin-walled bearing retaining frames described above.
[0027] The utility model discloses a thin-walled bearing retainer, wherein a first ball socket and a second ball socket are provided on a retainer body, and the width of the first ball socket along the circumferential direction of the retainer body is greater than the width of the second ball socket along the circumferential direction of the retainer body, thereby enabling the ball in the first ball socket to rotate and move, thereby enabling the position of the ball in the first ball socket to change. During the rotation of the bearing, the first ball socket provides a larger space for the reversal of the ball, thereby reducing the contact area between the ball and the first ball socket, reducing the obstacle to the ball changing the rotation direction, and under the interaction of centrifugal force and inertia, the ball is subjected to less force during the contact process with the side wall of the first ball socket, thereby achieving flexible contact, thereby effectively alleviating the problem of ball sticking and improving the flexibility of the bearing. BRIEF DESCRIPTION OF THE DRAWINGS
[0028] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.
[0029] Figure 1 It is a schematic structural diagram of a thin-walled bearing retainer disclosed in an embodiment of the utility model;
[0030] Figure 2 It is a schematic structural diagram of a first ball socket of a thin-walled bearing retainer disclosed in an embodiment of the utility model;
[0031] Figure 3 It is a structural schematic diagram of a second ball socket of a thin-walled bearing retainer disclosed in an embodiment of the utility model;
[0032] Figure 4 It is a partial front view of a thin-walled bearing retainer disclosed in an embodiment of the utility model;
[0033] Figure 5 It is a partial front view of the first ball sockets of the thin-walled bearing retainer disclosed in the embodiment of the utility model when they are arranged adjacently;
[0034] Figure 6 It is a partial front view of the second ball sockets of the thin-walled bearing retainer disclosed in the embodiment of the utility model when they are arranged adjacently;
[0035] Figure 7 It is a partial front view of another structure of the thin-walled bearing retainer disclosed in the embodiment of the utility model;
[0036] Figure 8 The utility model is an assembly diagram of a retainer and a ball of a thin-walled bearing disclosed in an embodiment of the utility model. DETAILED DESCRIPTION
[0037] The utility model discloses a thin-walled bearing retainer, which can alleviate the problem of rolling element jamming to meet the flexibility requirement. In addition, the utility model also discloses a thin-walled bearing having the thin-walled bearing retainer.
[0038] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.
[0039] In the following, the terms "first" and "second" are used for descriptive purposes only and are not to be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features.
[0040] Thin-walled bearings are small, light, compact and stable bearing products, widely used in precision machinery, aerospace, automobiles, robots and other fields. Its structure mainly consists of inner ring, outer ring, rolling element and cage. Among them, the inner ring and outer ring are the main parts of the thin-walled bearing, and the rolling element rolls between the inner and outer rings. The function of the cage is to keep the position of the rolling element stable and separate the rolling elements to prevent them from colliding with each other.
[0041] The bearings of industrial robots are one of their key accessories. They are characterized by being able to withstand combined loads in axial, radial, and overturning directions. Therefore, they are most suitable for the joints or rotating parts of industrial robots, the rotary tables of machining centers, the rotating parts of manipulators, precision rotary tables, medical instruments, measuring instruments, and IC manufacturing equipment.
[0042] Robot bearings are generally used in joints, which require high-speed and flexible operation, so the requirements for bearings are higher.
[0043] Usually, the retaining frame is provided with a ball pocket (also called a ball socket), and the rolling body is confined in the ball pocket but can rotate inside the ball pocket. However, during the reciprocating conversion of the rotation direction of the joint, the bearing needs to continuously rotate forward and reverse, that is, the rotation direction of the rolling body keeps changing, which makes it easy for the rolling body to get stuck inside the ball pocket, resulting in reduced bearing flexibility.
[0044] Based on this, the present application discloses a thin-walled bearing retainer, on which ball sockets of different sizes are arranged, so that the balls in the larger ball sockets can roll and move at the same time, so as to change the position of the balls and the support position, adapt to the uneven force situation, and thus alleviate the problem of ball jamming caused by uneven force.
[0045] Specific, combined Figure 1 As shown, the thin-walled bearing retainer 100 in the present application includes: a retainer body 103, and the retainer body 103 has a first ball socket 101 and a second ball socket 102. Among them, the retainer body 103 is an annular structure, and the first ball socket 101 and the second ball socket 102 are arranged along the circumference of the retainer body 103, and are used to accommodate balls. The first ball socket 101 and the second ball socket 102 in the present application are both open structures, and the width of the first ball socket 101 along the circumference of the retainer body 103 is greater than the width of the second ball socket 102 along the circumference of the retainer body 103; based on the above arrangement, the balls in the second ball socket 102 are arranged to rotate, and the balls in the first ball socket 101 are arranged to rotate and move.
[0046] The thin-walled bearing retainer 100 disclosed in the present application is provided with a first ball socket 101 and a second ball socket 102, and the width of the first ball socket 101 along the circumferential direction of the retainer body 103 is greater than the width of the second ball socket 102 along the circumferential direction of the retainer body 103, so that the ball in the first ball socket 101 can rotate and move, and then the position of the ball in the first ball socket 101 can be changed. During the rotation of the bearing, the first ball socket 101 provides a larger space for the reversal of the ball, so that the contact area between the ball and the first ball socket is reduced, and the obstacle to the ball changing the rotation direction is reduced. In addition, under the interaction of centrifugal force and inertia, the ball is subjected to less force during the contact process with the side wall of the first ball socket, thereby achieving flexible contact, thereby effectively alleviating the problem of ball sticking and improving the flexibility of the bearing.
[0047] In some embodiments, the width of the first socket 101 can be set according to different needs and is within the protection range. It should be noted that in order to prevent the movement distance of the balls in the first socket 101 from being too large, or to avoid reducing the number of balls due to the excessive width of the first socket 101, the width of the first socket 101 in the present application can be 1.2-1.5 times the width of the second socket 102.
[0048] like Figure 2 As shown, exemplarily, the first ball socket 101 is a U-shaped groove structure, the opening of the first ball socket 101 is located on the first side of the retaining frame body 103, and the bottom of the U-shaped groove and the side wall of the U-shaped groove are smoothly transitioned.
[0049] In the present application, by setting the first ball socket 101 as a U-shaped groove structure, the structure can be simplified, and the ball can be ensured to move stably in the U-shaped groove structure, avoiding the problem of the side wall of the first ball socket 101 and the ball being stuck. The bottom of the U-shaped groove structure is smoothly connected to the side wall, which can ensure that the contact area between the ball and the U-shaped groove is increased when the ball moves to the edge of the U-shaped groove, reduce the wear between the ball and the side wall, and relieve the ball from being stuck at the top corner of the U-shaped groove.
[0050] In some embodiments, the radius of the arc surface of the smooth connection between the groove bottom and the side wall of the first ball socket 101 is the same as the radius of the ball.
[0051] like Figure 3 As shown, exemplarily, the second ball socket 102 includes an arc groove 1022 and a guide groove 1021 .
[0052] The opening of the arc groove 1022 faces the first side of the retainer body 103 . The first side of the retainer body 103 in the present application is the opening side, and the second side is the plane side.
[0053] The guide groove 1021 is connected to the opening of the arc groove 1022, and the opening of the guide groove 1021 is located at the first side of the retainer body 103. The arc groove 1022 is used to accommodate the ball, and the guide groove 1021 serves as a passage for the ball to enter and exit the arc groove 1022.
[0054] In some embodiments, two opposite side walls of the guide groove 1021 are inclined surfaces, and the distance between the two side walls of the guide groove 1021 gradually increases from the arc groove 1022 to the opening direction of the guide groove 1021. It can be understood that the width of the guide groove 1021 along the circumferential direction of the retainer body 103 gradually increases from the direction close to the arc groove 1022 to the direction away from the arc groove 1022.
[0055] The width of the guide groove 1021 is set to gradually increase, so that the ball can enter the arc groove 1022 through the guide groove 1021, and the guide groove 1021 is used to block the ball, so that the ball is not easy to escape from the arc groove 1022. The width of the guide groove 1021 in the present application can be set according to different needs and is within the protection range. In some embodiments, the ball can enter the arc groove 1022 through the guide groove 1021 by extrusion.
[0056] In some embodiments, the two side walls of the guide groove 1021 have an inclination angle β of 10°-20° relative to the axial direction of the retainer body 103. Optionally, the inclination angle β of the guide groove 1021 is 15°. It can be understood by those skilled in the art that inclining both side walls of the guide groove 1021 to 15° can help ensure the symmetry of the guide groove 1021.
[0057] Combination Figures 2 to 4 As shown, along the axial direction of the retainer body 103, the height of the groove bottom of the first ball socket 101 is the same as the height of the groove bottom of the arc groove 1022 of the second ball socket 102. The arc groove 1022 of the first ball socket 101 is a semicircular arc surface, and the height of the arc groove 1022 of the first ball socket 101 includes but is not limited to 0.7R-0.8R, where R is the diameter of the arc groove 1022. The width L2 of the opening of the guide groove 1021 is equal to R.
[0058] The width L1 of the first ball socket 101 is greater than the width L2 of the second ball socket 102, and the depth of the first ball socket 101 is equal to the depth of the second ball socket 102. The first ball socket 101 and the second ball socket 102 contain balls of the same size.
[0059] The first ball socket 101 and the second ball socket 102 in the present application are arranged alternately, and the thickness of the wall beam between the first ball socket 101 and the second ball socket 102 is equal. Figure 1 As shown, the wall beams on both sides of the first ball socket 101 are arranged symmetrically about the first ball socket 101 , one side of the wall beam forms an inner wall of one side of the first ball socket 101 , and the other side of the wall beam forms an inner wall of one side of the second ball socket 102 .
[0060] It can be understood that after the first ball socket 101 and the second ball socket 102 are dug on the retainer body 103 , a wall beam will be formed on the retainer body 103 , and the first ball socket 101 or the second ball socket 102 will be formed between two adjacent wall beams.
[0061] Combination Figure 5 and Figure 6 As shown, in some embodiments, the first ball sockets 101 can be arranged adjacent to each other, and the second ball sockets 102 can be arranged adjacent to each other. The arrangement of the first ball sockets 101 and the second ball sockets 102 can be set according to different needs. For example, two first ball sockets 101 including but not limited to two can be arranged adjacent to each other, and one second ball socket 102 including but not limited to one can be arranged adjacent to each other.
[0062] Of course, it is possible to arrange the first ball sockets 101 adjacent to each other, the same number of second ball sockets 102 adjacent to each other, and the same number of first ball sockets 101 and the adjacent number of second ball sockets 102 alternately, such as Figure 7 shown.
[0063] The retainer body 103 disclosed in the present application is a welded structure, which uses welding to weld the strip material into a circular ring structure. The welding method is convenient for stamping the material strip to obtain the first ball socket 101 and the second ball socket 102, and the welding into a circular ring structure can ensure the strength after connection and the consistency of the retainer.
[0064] In some embodiments, the retainer body 103 is a copper structure. Those skilled in the art can understand that the retainer body 103 can be set to other materials according to different needs and it is also within the protection range.
[0065] In addition, the present application also discloses a thin-walled bearing, including a retainer, wherein the retainer is the thin-walled bearing retainer disclosed in the above embodiment. Therefore, the thin-walled bearing having the thin-walled bearing retainer also has all the above technical effects, which will not be repeated here.
[0066] Figure 8 As shown, the thin-walled bearing comprises an inner ring, an outer ring, a rolling element 200 and a retaining frame 100. The rolling element 200 is installed in the first ball socket 101 and the second ball socket 102.
[0067] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.
[0068] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.
Claims
1. A thin-walled bearing cage, characterized in that: include: A cage body (103), the cage body (103) being an annular structure, a first ball socket (101) and a second ball socket (102) for accommodating balls being arranged along the circumference of the cage body (103), the first ball socket (101) and the second ball socket (102) both being open structures, the width of the first ball socket (101) along the circumference of the cage body (103) being greater than the width of the second ball socket (102) along the circumference of the cage body (103); The ball in the second ball socket (102) is rotatably arranged, and the ball in the first ball socket (101) is rotatably and movably arranged.
2. The thin-walled bearing retainer according to claim 1, characterized in that: The first ball socket (101) is a U-shaped groove structure, the opening of the first ball socket (101) is located on the first side of the retaining frame body (103), and the groove bottom of the U-shaped groove and the side wall of the U-shaped groove are smoothly transitioned.
3. The thin-walled bearing retainer according to claim 2, characterized in that: The second ball socket (102) comprises: A circular arc groove (1022), wherein the opening of the circular arc groove (1022) faces the first side of the retainer body (103); A guide groove (1021), wherein the guide groove (1021) is connected to an opening of the arc groove (1022), and the opening of the guide groove (1021) is located on a first side of the retaining frame body (103).
4. The thin-walled bearing retainer according to claim 3, characterized in that: The two opposite side walls of the guide groove (1021) are inclined surfaces, and the distance between the two side walls of the guide groove (1021) gradually increases from the arc groove (1022) toward the opening direction of the guide groove (1021).
5. The thin-walled bearing retainer according to claim 4, characterized in that: The inclination angle of the two side walls of the guide groove (1021) relative to the axial direction of the retainer body (103) is 10°-20°.
6. The thin-walled bearing retainer according to claim 3, characterized in that: Along the axial direction of the retainer body (103), the height of the groove bottom of the first ball socket (101) is the same as the height of the groove bottom of the arc groove of the second ball socket (102).
7. The thin-walled bearing retainer according to claim 3, characterized in that: The arc groove (1022) is a semicircular arc groove, and the width of the opening of the guide groove (1021) is equal to the diameter of the arc groove (1022).
8. The thin-walled bearing cage according to any one of claims 1 to 7, characterized in that: The first ball sockets (101) and the second ball sockets (102) are arranged alternately, and the thickness of the wall beam between the first ball sockets (101) and the second ball sockets (102) are equal; or, The first ball sockets (101) are arranged adjacent to each other and / or the second ball sockets (102) are arranged adjacent to each other.
9. The thin-walled bearing cage according to any one of claims 1 to 7, characterized in that: The retainer body (103) is a welded structure; And / or, the retainer body (103) is a copper structure.
10. A thin-walled bearing, comprising a retainer, characterized in that: The retainer is a thin-walled bearing retainer as described in any one of claims 1 to 9.