Self-compensating precision bearing

Abstract

The utility model discloses a self-compensating precision bearing which comprises an outer ring, an inner ring, a rolling body and a retainer, and the rolling body and the elastic self-compensation mechanism are arranged in a gradually-changed annular cavity between the outer ring and the inner ring. The elastic self-compensation mechanism is arranged on the outer side of the gradually-shrinking annular cavity between the outer ring and the inner ring to apply radial and axial pre-tightening force to the rolling body at the same time, so that the rolling body can be tightly attached to the outer ring and the inner ring all the time, zero-approaching self-compensation adjustment of a clearance is achieved, the precision stability of the bearing is greatly guaranteed, and the service life of the bearing is prolonged. In addition, the bearing has the advantages of being simple in structure, easy to adjust, high in adjusting precision, convenient to maintain and replace, long in service life, high in practicability and the like. According to the utility model, the production and maintenance cost is obviously reduced, the production continuity is effectively ensured, and the production efficiency is improved.

Description

Technical Field

[0001] The utility model relates to bearing equipment, in particular to a self-compensating precision bearing, and belongs to the technical field of precision bearings. 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 during its movement, and ensure its rotation accuracy. Bearings are generally composed of four parts: outer ring, inner ring, rolling element and cage.

[0003] According to ISO's grading standards, bearings are divided into: P0, P6, P5, P4, P2, with the grades increasing in sequence, of which P0 is ordinary precision and the other grades are precision grades. Of course, different grading standards and different types of bearings have different grading methods, but the meaning is the same. The performance of precision bearings requires the rotating body to have high runout accuracy, high-speed rotation, and small friction and friction change.

[0004] Precision bearings have high requirements for use, especially for precision equipment, which has more stringent requirements on the accuracy fluctuation of precision bearings. Even extremely precise bearings will have larger bearing clearance after being used for a period of time due to the wear of the rolling elements and the inner and outer rings, and cannot meet the use requirements of precision equipment. Therefore, new precision bearings need to be replaced frequently. However, due to the high precision requirements of precision bearings themselves, their prices are relatively expensive. Frequent replacement greatly increases production costs and is not conducive to the continuous operation of precision equipment. Frequent replacement operations can also easily increase the connection error between the bearing and the precision equipment, which seriously affects the working accuracy of the precision equipment.

[0005] It is of great significance to realize the self-compensation adjustment of the bearing, thereby prolonging the service life of the bearing, reducing the production cost and improving the production efficiency. CN214118742U discloses an adaptive adjustment bearing, which mainly controls the depth of the first and second limit plates extending into the gap between the ball and the inner and outer walls by adjusting the spring and the movable plate to realize the compensation of the clearance, so as to improve the rotation accuracy of the bearing. After automatic adjustment, the ball is no longer directly in contact with the inner and outer walls, but contacts with multiple limit plates, which requires a high material of the limit plate to ensure that the wear and loss between the ball and each limit plate is consistent, otherwise it is difficult to continue to ensure the bearing accuracy; and because the limit plate is a movable part, the ball does not directly act on the inner and outer walls, resulting in a large gap between the inner and outer walls, and the effect of a tight bearing cannot be achieved. CN213332052U discloses a tapered roller bearing clearance adjustment structure, which provides a cavity in the outer ring of the bearing, and installs a spring and a ball perpendicular to the surface of the rolling body in the cavity, so as to apply a radial force to the rolling body so that the other side of the rolling body is always in contact with the inner ring wall of the bearing. In order to ensure the accuracy, a set of spring and ball mechanisms need to be provided for each rolling body, which has the disadvantages of complex structure, inconvenient maintenance and high preparation cost. In addition, since the spring is in direct contact with the surface of the rolling body through the ball, when the rolling body rotates, since the surfaces of the two adjacent rolling bodies are not in a plane, when the ball rolls between the two rolling bodies, the ball is stuck between the two rolling bodies, so that the rolling body cannot rotate. CN2735068Y discloses a single-row tapered roller bearing capable of maintaining a minimum clearance, which achieves a close fit between the roller and the inner and outer rings by pushing the inner ring with a spiral spring. The implementation of this solution must rely on the relative sliding between the inner ring and the shaft rod as a prerequisite. It is obviously not suitable for precision bearings in which the shaft rod and the inner ring are fixedly connected. Its applicability is limited and it cannot be used as a precision bearing.

[0006] In summary, the prior art still has many deficiencies in the self-compensation adjustment of precision bearings, and cannot meet the stability and durability of the precision self-compensation adjustment of precision bearings during long-term use. Utility Model Content

[0007] In view of the problems of poor stability and durability, high preparation cost and inconvenient maintenance and replacement in the existing technology for self-compensating adjustment of bearing precision, the utility model provides a self-compensating precision bearing, which provides an elastic self-compensating mechanism on the outside of the tapered annular cavity between the outer ring and the inner ring to apply radial and axial preload to the rolling element at the same time, so that the rolling element can always fit tightly with the outer ring and the inner ring, realizing self-compensating adjustment of the clearance towards zero, ensuring the stability of the bearing precision, and has a simple structure, convenient maintenance and replacement, and significantly increased the service life of the bearing.

[0008] In order to achieve the above technical objectives, the technical solutions adopted by the present utility model are as follows:

[0009] A self-compensating precision bearing, comprising an outer ring, an inner ring, rolling elements and a retaining frame. The outer ring and the inner ring form an annular cavity, the axial cross section of the cavity is a trapezoid or a triangle (i.e. the width of the annular cavity gradually decreases from the outside to the inside along the axial direction). The rolling element is arranged in the annular cavity between the outer ring and the inner ring through the retaining frame. An elastic self-compensating mechanism is also arranged on the wider outer side (axial outer side) of the annular cavity, and the elastic self-compensating mechanism is located on the outer side (axial outer side) of the retaining frame. The elastic self-compensating mechanism applies an axial preload to the retaining frame, so that the rolling element can always fit tightly with the outer ring and the inner ring through the retaining frame.

[0010] Preferably, the bearing further comprises an outer guide rail and an inner guide rail arranged between the outer ring and the inner ring. The outer guide rail is located between the inner wall (radial inner wall) of the outer ring and the rolling element, and the inner guide rail is located between the outer wall (radial outer wall) of the inner ring and the rolling element. Symmetrical arc grooves are arranged on the side wall (radial inner wall) of the outer guide rail close to the rolling element and on the side wall (radial outer wall) of the inner guide rail close to the rolling element, and the arc grooves on the outer guide rail and the arc grooves on the inner guide rail together constitute an annular channel for the rolling element to roll. The side wall (radial outer wall) of the outer guide rail away from the rolling element fits with the inner wall (radial inner wall) of the outer ring, and the side part (radial inner wall) of the inner guide rail away from the rolling element fits with the outer wall (radial outer wall) of the inner ring.

[0011] Preferably, the axial cross section of the retainer is a T-shaped structure, including a vertical axis section and a transverse diameter section. The vertical axis section extends axially into the annular channel between the outer guide rail and the inner guide rail and clamps the rolling body. The transverse diameter section extends radially and is located between the elastic self-compensation mechanism and the outer guide rail and the inner guide rail. Preferably, the rolling body is a ball or a roller.

[0012] Preferably, the elastic self-compensation mechanism comprises a gland, an elastic body, a pressure strip and a rolling connector. The gland is arranged between the outer ring and the inner ring and is located at the wider outer end of the annular cavity. The pressure strip and the rolling connector are both arranged between the gland and the rolling body, wherein the outer surface (axial outer surface) of the pressure strip is pre-tightenedly connected to the gland through the elastic body, and the inner surface (axial inner surface) of the pressure strip is rollingly connected to the retaining frame through the rolling connector.

[0013] Preferably, the gland and the pressure strip are both annular structures. A plurality of elastic bodies are evenly arranged between the gland and the pressure strip, and in the circumferential direction, the plurality of elastic bodies form a ring shape. Preferably, in the radial direction, a plurality of ring-shaped elastic bodies are arranged between the gland and the pressure strip.

[0014] Preferably, the elastic body is one or more of a spring, a spring sheet, and a rubber body.

[0015] Preferably, in the axial direction, an annular groove is provided on the inner surface of the molding (axial inner surface), and a symmetrical annular groove is also provided on the outer surface of its corresponding retaining frame (axial outer surface), and the rolling connector is arranged in an annular channel jointly formed by the annular groove of the molding and the annular groove of the retaining frame.

[0016] Preferably, in the radial direction, a plurality of pairs of symmetrical annular grooves are provided on the inner surface of the pressure strip and the outer surface of the retaining frame to form a plurality of independent ring tracks, and a plurality of rolling connectors evenly distributed along the circumferential direction are provided in each ring track.

[0017] Preferably, the rolling connection body is one of a ball and a roller, preferably a ball. In the circumferential direction, a plurality of rolling connection bodies in the same ring are sequentially connected in series through a rolling cage.

[0018] Preferably, in the axial direction, multiple circles of rolling bodies are arranged between the outer ring and the inner ring, and each circle of rolling bodies is provided with an independent retaining frame. Any two adjacent circles of rolling bodies are connected by a pressure strip and a rolling connector.

[0019] Preferably, the gland and the inner wall of the outer ring, and the gland and the outer wall of the inner ring are both threadedly connected. Preferably, the axial thickness of the threaded area on the inner wall of the outer ring and the axial thickness of the threaded area on the outer wall of the inner ring are both greater than the thickness of the gland.

[0020] Preferably, a fixing protrusion and / or a concave hole are provided on the outer surface (axial outer surface) of the gland. The fixing protrusion and / or the concave hole drive the gland to rotate in the circumferential direction, thereby adjusting the depth of the gland in the annular cavity between the outer ring and the inner ring along the axial direction. It should be noted that in the threaded area of ​​the outer ring and the inner ring, the width of the annular cavity in the radial direction is consistent.

[0021] In the prior art, some precision equipment inevitably needs to use precision bearings to ensure the stability and durability of the precision of the operation of the precision equipment. However, after a period of use, the general precision bearings will have a larger bearing clearance due to friction loss and other reasons, which will affect the stability of the overall precision of the precision equipment. Frequent replacement has a large cost investment, and the bearing and precision equipment will have poor fit. Some existing bearings with self-compensation functions either have poor precision stability, complex structure and high manufacturing cost, or poor durability and poor applicability and cannot be used as precision bearings. The utility model specifically provides a precision bearing with a bearing clearance elastic self-compensation mechanism, which can automatically compensate for the change of bearing clearance at any time, so that the bearing clearance change can be infinitely zeroed, and the stability of the bearing accuracy is guaranteed to a great extent. The entire elastic self-compensation mechanism can realize self-preload adjustment, and has the characteristics of simple structure and durability. The precision bearing is an independent component. The inner ring and outer ring of the precision bearing only contact and act with other components of the device, and cannot be directly connected and fixed; that is, the precision bearing requires that its inner ring and outer ring are relatively active relative to the components in contact with them.

[0022] In the utility model, an inner guide rail is provided between the rolling body and the outer wall of the inner ring, and an outer guide rail is provided between the rolling body and the inner wall of the outer ring. The surfaces of the inner guide rail and the outer guide rail in contact with the rolling body are both concave arc surfaces that fit the surface of the rolling body, and the two opposite concave arc surfaces together constitute an annular channel for the rolling body to rotate and roll. By providing the inner guide rail and the outer guide rail, the precision stability of the rolling body during rotation and rolling can be effectively guaranteed, and the elastic self-compensation mechanism can also be assisted to realize the self-compensation adjustment of the clearance.

[0023] In the utility model, the retainer is a structure with a T-shaped axial cross section formed by a vertical axis section and a transverse diameter section. The vertical axis section extends axially into the annular channel between the outer guide rail and the inner guide rail and clamps the rolling body to ensure the integrity and stability of multiple rolling bodies distributed along the circumferential direction, while the transverse diameter section is located axially outside the outer guide rail and the inner guide rail and has a length in the radial direction greater than the spacing width between the outer guide rail and the inner guide rail. When the retainer is subjected to the pressure applied by the elastic self-compensation mechanism, it can simultaneously apply pressure to the rolling body, the inner guide rail, and the outer guide rail, thereby maintaining the radial position relationship between the rolling body and the inner guide rail and the outer guide rail unchanged, thereby ensuring the overall adjustability and precision stability of the bearing.

[0024] In the utility model, the elastic self-compensation mechanism includes a pressure cover, an elastic body, a pressure strip and a rolling connector. Along the direction from the axial outer side to the inner side of the annular cavity between the outer ring and the inner ring, the pressure cover, the elastic body, the pressure strip, the rolling connector and the retaining frame are connected in series in sequence. The pressure cover is fixed to the inner ring and the outer ring, and then a pre-tightening force is applied to the elastic body, so that the spring presses the pressure strip inward (axially inward), and the pressure strip continues to apply an axial force inward to the retaining frame through the rolling connector after being pressed. When the clearance between the rolling body and the inner ring and the outer ring (or the inner guide rail and the outer guide rail) increases due to wear, the retaining frame can drive the rolling body (including or excluding the inner guide rail and the outer guide rail) to move axially inward in real time, thereby ensuring that the clearance will not change significantly due to the wear of the rolling body, thereby improving the accuracy and stability of the precision bearing.

[0025] Furthermore, the pressure cover is fixedly connected to the inner ring and the outer ring through threads. As the bearing is used for a longer time, the wear of the rolling element increases and the preset preload force of the elastomer will be gradually released, resulting in insufficient elastic force (or the elasticity of the elastomer becomes weaker after a long time). At this time, the elastomer cannot achieve continuous pressure on the rolling element well (the pressure effect becomes worse). In this case, it is only necessary to twist the pressure cover to displace it axially inward according to actual needs, so as to compress the elastomer and generate a new preload force that meets the working conditions. Moreover, due to the thread adjustment, the compression adjustment accuracy of the elastomer is higher (for example, half a turn, quarter of a turn, etc. non-full turn thread rotation adjustment can be performed), and the accuracy stability of the precision bearing can be quickly restored without replacing the bearing or elastomer, thereby greatly improving the service life of the bearing. In addition, since it is a threaded adjustment, in the initial state, it is also possible to adjust the problem of excessive force exerted on the rolling element due to excessive preload of the elastomer, causing accelerated wear of the rolling element. That is, the size of the elastomer preload can be adaptively adjusted according to the actual working conditions. On the premise of meeting the self-compensation requirements of the rolling element clearance, the wear of the rolling element is increased as little as possible without changing phase, thereby further improving the service life of the precision bearing and reducing the production input cost.

[0026] In the present invention, the elastic body is one or more of a spring, a spring sheet, and a rubber body, including but not limited to any product similar to a spring or a spring sheet made of existing materials that can generate elastic force through compression.

[0027] In the utility model, the elastic self-compensating mechanism provided has a simple structure and can be self-adjusted. Without changing the overall structure of the elastic self-compensating mechanism, multiple circles of rolling elements can be arranged in the axial direction, and any two adjacent circles of rolling elements can be connected by pressure strips and rolling connectors. That is, the elastic self-compensating mechanism can simultaneously perform pressurization self-compensation on multiple circles of rolling elements, which is beneficial to increasing the load-bearing upper limit of the tight bearing, and also helps to increase the axial width of the bearing so that it is suitable for different working conditions, thereby improving the applicability of the bearing.

[0028] In the utility model, a fixing protrusion and / or a concave hole is arranged on the outer surface of the gland. After the protrusion and / or the concave hole are fixed manually or by twisting a matching wrench, the gland is driven to rotate in the circumferential direction, thereby adjusting the depth of the gland into the annular cavity between the outer ring and the inner ring along the axial direction. The adjustment is simple, and can be adjusted in both positive and negative directions, with high adjustment accuracy.

[0029] In the present invention, it should be noted that, for the sake of convenience, the "inside" and "outside" mentioned herein are relative references. Without other special instructions, it should be generally considered in this article that: in the axial direction: the wider side of the annular cavity between the outer ring and the inner ring is the axial outer side, and vice versa is the axial inner side. In the radial direction: the side close to the inner ring is the inner side, and the side close to the outer ring is the outer side.

[0030] Compared with the prior art, the beneficial technical effects of the utility model are as follows:

[0031] 1: The utility model can simultaneously apply radial and axial preload forces to the rolling element by arranging an elastic self-compensation mechanism on the outer side of the gradually changing annular cavity, so that the rolling element can always fit tightly with the outer ring and the inner ring, thereby realizing the zero self-compensation adjustment of the clearance, which greatly ensures the stability of the bearing accuracy.

[0032] 2: The elastic self-compensation mechanism of the utility model has a simple structure, is easy to adjust, and has high adjustment accuracy. It can greatly guarantee and improve the precision stability, durability and practicality of the bearing, significantly reduce production and maintenance costs, effectively ensure production continuity, and improve production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 It is a schematic diagram of the cross-sectional structure of the self-compensating precision bearing of the utility model.

[0034] Figure 2 It is a schematic diagram of the half-section three-dimensional structure of the self-compensating precision bearing described in the utility model.

[0035] Figure 3 It is a structural schematic diagram of the retaining frame of the utility model.

[0036] Figure 4 It is a structural schematic diagram of the gland described in the utility model.

[0037] Figure 5 It is a structural schematic diagram of the layering strip described in the utility model.

[0038] Figure 6 It is a structural schematic diagram of the rolling cage described in the utility model.

[0039] Figure 7 It is a schematic diagram of the exploded structure of the elastic self-compensation mechanism of the utility model.

[0040] Figure numerals: 1: outer ring; 2: inner ring; 3: rolling element; 4: cage; 5: elastic self-compensation mechanism; 501: pressure cover; 502: elastic body; 503: pressure strip; 504: rolling connector; 505: rolling cage; 6: outer guide rail; 7: inner guide rail. DETAILED DESCRIPTION

[0041] The technical solution of the utility model is illustrated below, and the scope of protection requested for the utility model includes but is not limited to the following embodiments.

[0042] A self-compensating precision bearing, comprising an outer ring 1, an inner ring 2, a rolling element 3 and a retaining frame 4. The outer ring 1 and the inner ring 2 form an annular cavity, and the axial cross section of the cavity is a trapezoid or a triangle. The rolling element 3 is arranged in the annular cavity between the outer ring 1 and the inner ring 2 through the retaining frame 4. An elastic self-compensating mechanism 5 is also arranged on the wider outer side of the annular cavity, and the elastic self-compensating mechanism 5 is located on the outer side of the retaining frame 4. The elastic self-compensating mechanism 5 applies an axial preload to the retaining frame 4, so that the rolling element 3 can always fit tightly with the outer ring 1 and the inner ring 2 through the retaining frame 4.

[0043] Preferably, the bearing further comprises an outer guide rail 6 and an inner guide rail 7 arranged between the outer ring 1 and the inner ring 2. The outer guide rail 6 is located between the inner wall of the outer ring 1 and the rolling element 3, and the inner guide rail 7 is located between the outer wall of the inner ring 2 and the rolling element 3. Symmetrical arc grooves are arranged on the side wall of the outer guide rail 6 close to the rolling element 3 and on the side wall of the inner guide rail 7 close to the rolling element 3, and the arc grooves on the outer guide rail 6 and the arc grooves on the inner guide rail 7 together constitute an annular channel for the rolling element 3 to roll. The side wall of the outer guide rail 6 away from the rolling element 3 is in contact with the inner wall of the outer ring 1, and the side part of the inner guide rail 7 away from the rolling element 3 is in contact with the outer wall of the inner ring 2.

[0044] Preferably, the axial cross section of the retainer 4 is a T-shaped structure, including a vertical axis section and a transverse diameter section. The vertical axis section extends axially into the annular channel between the outer guide rail 6 and the inner guide rail 7 and clamps the rolling body 3. The transverse diameter section extends radially and is located between the elastic self-compensation mechanism 5 and the outer guide rail 6 and the inner guide rail 7. Preferably, the rolling body 3 is a ball or a roller.

[0045] Preferably, the elastic self-compensation mechanism 5 comprises a pressure cover 501, an elastic body 502, a pressure strip 503 and a rolling connection body 504. The pressure cover 501 is arranged between the outer ring 1 and the inner ring 2 and is located at the wider outer end of the annular cavity. The pressure strip 503 and the rolling connection body 504 are both arranged between the pressure cover 501 and the rolling body 3, wherein the outer surface of the pressure strip 503 is pre-tightenedly connected to the pressure cover 501 through the elastic body 502, and the inner surface of the pressure strip 503 is rollingly connected to the retaining frame 4 through the rolling connection body 504.

[0046] Preferably, the gland 501 and the pressure strip 503 are both annular structures. A plurality of elastic bodies 502 are evenly arranged between the gland 501 and the pressure strip 503, and in the circumferential direction, the plurality of elastic bodies 502 form a ring shape. Preferably, in the radial direction, a plurality of ring-shaped elastic bodies 502 are arranged between the gland 501 and the pressure strip 503.

[0047] Preferably, the elastic body 502 is one or more of a spring, a spring sheet, and a rubber body.

[0048] Preferably, in the axial direction, an annular groove is provided on the inner surface of the pressure strip 503, and a symmetrical annular groove is also provided on the outer surface of its corresponding retaining frame 4, and the rolling connector 504 is arranged in an annular channel jointly formed by the annular groove of the pressure strip 503 and the annular groove of the retaining frame 4.

[0049] Preferably, in the radial direction, a plurality of pairs of symmetrical annular grooves are provided on the inner surface of the pressure strip 503 and the outer surface of the retaining frame 4 to form a plurality of independent ring tracks, and a plurality of rolling connectors 504 evenly distributed along the circumferential direction are provided in each ring track.

[0050] Preferably, the rolling connection body 504 is a ball or a roller, preferably a ball. In the circumferential direction, a plurality of rolling connection bodies 504 in the same ring are sequentially connected in series through a rolling cage 505 .

[0051] Preferably, in the axial direction, multiple circles of rolling bodies 3 are arranged between the outer ring 1 and the inner ring 2, and each circle of rolling bodies 3 is provided with an independent cage 4. Any two adjacent circles of rolling bodies 3 are connected by a pressure strip 503 and a rolling connector 504.

[0052] Preferably, the gland 501 is connected to the inner wall of the outer ring 1 and the gland 501 is connected to the outer wall of the inner ring 2 by threads. Preferably, the axial thickness of the threaded area on the inner wall of the outer ring 1 and the axial thickness of the threaded area on the outer wall of the inner ring 2 are both greater than the thickness of the gland 501.

[0053] Preferably, a fixing protrusion and / or a concave hole are provided on the outer surface of the gland 501. The fixing protrusion and / or the concave hole drive the gland 501 to rotate in the circumferential direction, thereby adjusting the depth of the gland 501 in the annular cavity between the outer ring 1 and the inner ring 2 along the axial direction.

[0054] Example 1

[0055] like Figure 1-2 As shown, a self-compensating precision bearing includes an outer ring 1, an inner ring 2, rolling elements 3 and a retaining frame 4. The outer ring 1 and the inner ring 2 form an annular cavity, and the axial cross-section of the cavity is a trapezoid or a triangle. The rolling element 3 is arranged in the annular cavity between the outer ring 1 and the inner ring 2 through the retaining frame 4. An elastic self-compensating mechanism 5 is also arranged on the wider outer side of the annular cavity, and the elastic self-compensating mechanism 5 is located on the outer side of the retaining frame 4. The elastic self-compensating mechanism 5 applies an axial preload to the retaining frame 4, so that the rolling element 3 can always fit tightly with the outer ring 1 and the inner ring 2 through the retaining frame 4.

[0056] Example 2

[0057] Repeat Example 1, except that the bearing further includes an outer guide rail 6 and an inner guide rail 7 arranged between the outer ring 1 and the inner ring 2. The outer guide rail 6 is located between the inner wall of the outer ring 1 and the rolling element 3, and the inner guide rail 7 is located between the outer wall of the inner ring 2 and the rolling element 3. Symmetrical arc grooves are arranged on the side wall of the outer guide rail 6 close to the rolling element 3 and on the side wall of the inner guide rail 7 close to the rolling element 3, and the arc grooves on the outer guide rail 6 and the arc grooves on the inner guide rail 7 together constitute an annular channel for the rolling element 3 to roll. The side wall of the outer guide rail 6 away from the rolling element 3 is in contact with the inner wall of the outer ring 1, and the side part of the inner guide rail 7 away from the rolling element 3 is in contact with the outer wall of the inner ring 2.

[0058] Example 3

[0059] Example 2 is repeated, except that the axial cross section of the retainer 4 is a T-shaped structure, including a vertical axis section and a transverse diameter section. The vertical axis section extends axially into the annular channel between the outer guide rail 6 and the inner guide rail 7 and clamps the rolling element 3. The transverse diameter section extends radially and is located between the elastic self-compensation mechanism 5 and the outer guide rail 6 and the inner guide rail 7.

[0060] Example 4

[0061] Example 3 is repeated, except that the rolling body 3 is a roller.

[0062] Example 5

[0063] Example 3 is repeated, except that the rolling element 3 is a ball.

[0064] Example 6

[0065] Repeat Example 5, except that the elastic self-compensation mechanism 5 includes a pressure cover 501, an elastic body 502, a pressure strip 503 and a rolling connection body 504. The pressure cover 501 is arranged between the outer ring 1 and the inner ring 2 and is located at the wider outer end of the annular cavity. The pressure strip 503 and the rolling connection body 504 are both arranged between the pressure cover 501 and the rolling body 3, wherein the outer surface of the pressure strip 503 is pre-tightenedly connected to the pressure cover 501 through the elastic body 502, and the inner surface of the pressure strip 503 is rollingly connected to the retaining frame 4 through the rolling connection body 504.

[0066] Example 7

[0067] The embodiment 6 is repeated, except that the pressure cover 501 and the pressure strip 503 are both annular structures. A plurality of elastic bodies 502 are evenly arranged between the pressure cover 501 and the pressure strip 503, and in the circumferential direction, the plurality of elastic bodies 502 form a ring shape.

[0068] Example 8

[0069] Example 7 is repeated, except that in the radial direction, a plurality of ring-shaped elastic bodies 502 are provided between the pressure cover 501 and the pressure strip 503 .

[0070] Example 9

[0071] Example 8 is repeated, except that the elastic body 502 is a spring.

[0072] Example 10

[0073] Repeat Example 9, except that in the axial direction, an annular groove is provided on the inner surface of the molding 503, and a symmetrical annular groove is also provided on the outer surface of its corresponding retaining frame 4, and the rolling connector 504 is arranged in an annular channel formed by the annular groove of the molding 503 and the annular groove of the retaining frame 4.

[0074] Embodiment 11

[0075] Example 10 is repeated, except that in the radial direction, multiple pairs of symmetrical annular grooves are provided on the inner surface of the pressure strip 503 and the outer surface of the retaining frame 4 to form multiple independent ring tracks, and each ring track is provided with multiple rolling connectors 504 evenly distributed along the circumferential direction.

[0076] Example 12

[0077] The embodiment 11 is repeated, except that the rolling connection body 504 is a ball. In the circumferential direction, a plurality of rolling connection bodies 504 in the same ring are sequentially connected in series through the rolling cage 505 .

[0078] Embodiment 13

[0079] Example 12 is repeated, except that in the axial direction, multiple circles of rolling bodies 3 are arranged between the outer ring 1 and the inner ring 2, and each circle of rolling bodies 3 is provided with an independent cage 4. Any two adjacent circles of rolling bodies 3 are connected by a pressure strip 503 and a rolling connector 504.

[0080] Embodiment 14

[0081] Example 13 is repeated, except that the gland 501 and the inner wall of the outer ring 1, and the gland 501 and the outer wall of the inner ring 2 are both threadedly connected.

[0082] Embodiment 15

[0083] Example 14 is repeated, except that the axial thickness of the threaded area arranged on the inner wall of the outer ring 1 and the axial thickness of the threaded area arranged on the outer wall of the inner ring 2 are both greater than the thickness of the pressure cover 501.

[0084] Example 16

[0085] Example 15 is repeated, except that a fixing protrusion is provided on the outer surface of the gland 501. The fixing protrusion drives the gland 501 to rotate in the circumferential direction, thereby adjusting the depth of the gland 501 in the annular cavity between the outer ring 1 and the inner ring 2 along the axial direction.

[0086] Embodiment 17

[0087] Example 15 is repeated, except that a fixed recessed hole is provided on the outer surface of the gland 501. The gland 501 is driven to rotate in the circumferential direction through the fixed recessed hole, thereby adjusting the depth of the gland 501 in the annular cavity between the outer ring 1 and the inner ring 2 along the axial direction.

Claims

1. A self-compensating precision bearing, comprising an outer ring (1), an inner ring (2), rolling elements (3) and a cage (4); the outer ring (1) and the inner ring (2) form an annular cavity, the axial cross section of the cavity is a trapezoid or a triangle; the rolling elements (3) are arranged in the annular cavity between the outer ring (1) and the inner ring (2) through the cage (4); characterized in that: An elastic self-compensating mechanism (5) is also provided on the wider outer side of the annular cavity, and the elastic self-compensating mechanism (5) is located on the outer side of the retaining frame (4); the elastic self-compensating mechanism (5) applies an axial preload force to the retaining frame (4), so that the rolling element (3) can always fit tightly with the outer ring (1) and the inner ring (2) through the retaining frame (4).

2. The bearing according to claim 1, characterized in that: The bearing further comprises an outer guide rail (6) and an inner guide rail (7) arranged between the outer ring (1) and the inner ring (2); wherein the outer guide rail (6) is located between the inner wall of the outer ring (1) and the rolling element (3), and the inner guide rail (7) is located between the outer wall of the inner ring (2) and the rolling element (3); symmetrical arcuate grooves are arranged on the side wall of the outer guide rail (6) close to the rolling element (3) and on the side wall of the inner guide rail (7) close to the rolling element (3), and the arcuate grooves on the outer guide rail (6) and the arcuate grooves on the inner guide rail (7) together form an annular channel for the rolling element (3) to roll; the side wall of the outer guide rail (6) away from the rolling element (3) is in contact with the inner wall of the outer ring (1), and the side part of the inner guide rail (7) away from the rolling element (3) is in contact with the outer wall of the inner ring (2).

3. The bearing according to claim 2, characterized in that: The axial cross section of the retaining frame (4) is a T-shaped structure, comprising a vertical axis section and a transverse diameter section; the vertical axis section extends axially into the annular channel between the outer guide rail (6) and the inner guide rail (7) and clamps the rolling body (3); the transverse diameter section extends radially and is located between the elastic self-compensation mechanism (5) and the outer guide rail (6) and the inner guide rail (7).

4. The bearing according to claim 3, characterized in that: The rolling element (3) is a ball or a roller.

5. The bearing according to any one of claims 1 to 4, characterized in that: The elastic self-compensation mechanism (5) comprises a pressure cover (501), an elastic body (502), a pressure strip (503) and a rolling connector (504); the pressure cover (501) is arranged between the outer ring (1) and the inner ring (2) and is located at the wider outer end of the annular cavity; the pressure strip (503) and the rolling connector (504) are both arranged between the pressure cover (501) and the rolling body (3), wherein the outer surface of the pressure strip (503) is pre-tightenedly connected to the pressure cover (501) through the elastic body (502), and the inner surface of the pressure strip (503) is rollingly connected to the retaining frame (4) through the rolling connector (504).

6. The bearing according to claim 5, characterized in that: The pressure cover (501) and the pressure strip (503) are both annular structures; a plurality of elastic bodies (502) are evenly arranged between the pressure cover (501) and the pressure strip (503), and in the circumferential direction, the plurality of elastic bodies (502) form a ring shape.

7. The bearing according to claim 6, characterized in that: In the radial direction, a plurality of ring-shaped elastic bodies (502) are arranged between the pressure cover (501) and the pressure strip (503).

8. The bearing according to claim 6, characterized in that: The elastic body (502) is one or more of a spring, a spring sheet, and a rubber body.

9. The bearing according to claim 6, characterized in that: In the axial direction, an annular groove is arranged on the inner surface of the pressure strip (503), and a symmetrical annular groove is also arranged on the outer surface of its corresponding retaining frame (4), and the rolling connection body (504) is arranged in an annular channel formed by the annular groove of the pressure strip (503) and the annular groove of the retaining frame (4).

10. The bearing according to claim 9, characterized in that: In the radial direction, a plurality of pairs of symmetrical annular grooves are arranged on the inner surface of the pressure strip (503) and the outer surface of the retaining frame (4) to form a plurality of independent ring tracks, and a plurality of rolling connectors (504) evenly distributed along the circumferential direction are arranged in each ring track.

11. The bearing according to claim 9, characterized in that: The rolling connection body (504) is a kind of ball or roller; in the circumferential direction, a plurality of rolling connection bodies (504) in the same ring track are sequentially connected in series via a rolling retaining frame (505).

12. The bearing according to any one of claims 6 to 11, characterized in that: In the axial direction, a plurality of circles of rolling bodies (3) are arranged between the outer ring (1) and the inner ring (2), and each circle of rolling bodies (3) is provided with an independent retaining frame (4); any two adjacent circles of rolling bodies (3) are connected via a pressure strip (503) and a rolling connecting body (504).

13. The bearing according to claim 5, characterized in that: The gland (501) and the inner wall of the outer ring (1), as well as the gland (501) and the outer wall of the inner ring (2) are both connected by threads.

14. The bearing according to any one of claims 6 to 11, characterized in that: The gland (501) and the inner wall of the outer ring (1), as well as the gland (501) and the outer wall of the inner ring (2) are both connected by threads.

15. The bearing according to claim 13, characterized in that: The axial thickness of the threaded area arranged on the inner wall of the outer ring (1) and the axial thickness of the threaded area arranged on the outer wall of the inner ring (2) are both greater than the thickness of the gland (501).

16. The bearing according to claim 14, characterized in that: The axial thickness of the threaded area arranged on the inner wall of the outer ring (1) and the axial thickness of the threaded area arranged on the outer wall of the inner ring (2) are both greater than the thickness of the gland (501).

17. The bearing according to any one of claims 13, 15 and 16, characterized in that: A fixing protrusion and / or a recessed hole are provided on the outer surface of the gland (501); the fixing protrusion and / or the recessed hole drive the gland (501) to rotate in the circumferential direction, thereby adjusting the depth of the gland (501) inserted axially into the annular cavity between the outer ring (1) and the inner ring (2).

18. The bearing according to claim 14, characterized in that: A fixing protrusion and / or a recessed hole are provided on the outer surface of the gland (501); the fixing protrusion and / or the recessed hole drive the gland (501) to rotate in the circumferential direction, thereby adjusting the depth of the gland (501) inserted axially into the annular cavity between the outer ring (1) and the inner ring (2).

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