A composite bearing

Abstract

The application discloses a composite bearing and belongs to the technical field of bearings.The composite bearing comprises a first supporting ring, a first rolling body and a second supporting ring, the second supporting ring comprises an axial supporting part and a radial supporting part, the axial supporting part extends along the radial direction, the radial supporting part extends along the axial direction, the first rolling body is rolling connected between the first supporting ring and the axial supporting part, the first rolling body is used for bearing axial load, the inner diameter side of the radial supporting part is provided with a second rolling body, the second rolling body is rolling connected between the to-be-installed part and the radial supporting part, the second rolling body is used for bearing radial load, and the axial stress center of the first rolling body corresponds to the radial range of the radial supporting part.The application can transmit the load along the axial direction of the radial supporting part when the first rolling body bears the axial load, avoid or reduce the overturning moment of the radial supporting part caused by the load in the axial direction, reduce the degree of inconsistent wear of the two ends of the second rolling body, and improve the service life of the composite bearing.

Description

Technical Field

[0001] This invention relates to the field of bearing technology, and in particular to a composite bearing. Background Technology

[0002] Bearings are an important component in modern mechanical equipment. Their main function is to support rotating mechanical parts, reduce the coefficient of friction during movement, and ensure rotational accuracy. Currently, bearings are widely used in various industries where rotation and oscillation are required.

[0003] Based on the direction of force applied to the bearing, they can be divided into radial load bearings and axial load bearings. Under certain specific working conditions, the rotating parts of mechanical equipment need to bear both radial and axial loads simultaneously. In this case, multiple bearings are required, and the combination of multiple bearings is necessary to achieve the corresponding support effect. Therefore, the design process requires consideration of the installation position and space for different individual bearings, resulting in a less compact structure and a larger space requirement.

[0004] For example, Chinese patent application CN 107975535 A discloses a combined bearing of cylindrical rollers and thrust steel balls, including an outer ring, an inner ring, thrust steel balls, cylindrical rollers, and a retainer. A groove for mounting the cylindrical rollers and a raceway for mounting the steel balls are provided between the outer and inner rings. This design combines cylindrical rollers and thrust steel balls to form an integrated combined bearing. However, the inner ring of this design uses a U-shaped structure. The cylindrical rollers are placed within the U-shaped structure, and the thrust steel balls are positioned to fit against the support arms of the U-shaped structure. When the bearing is subjected to thrust, the U-shaped structure is prone to overturning force, leading to uneven wear at both ends of the cylindrical rollers and affecting the bearing's service life.

[0005] For example, Chinese patent CN 201802760 U discloses a combined cylindrical roller and double-direction thrust ball bearing, consisting of an outer ring, steel balls, an inner ring, fastening screws, retainers, a second inner ring, and radial rollers. The outer diameter of the inner ring is set in two stepped layers of different sizes. A second inner ring is coaxially arranged side-by-side on one side of the smaller outer diameter of the inner ring. At least two sets of screw holes are evenly distributed axially on both the inner ring and the second inner ring, corresponding to each other, and fastening screws are installed in the screw holes. An outer ring is coaxially arranged outside the smaller outer diameter of the inner ring, and radial rollers are arranged between the inner diameter of the outer ring and the smaller outer diameter of the inner ring. Two retainers are symmetrically arranged coaxially on both sides of the outer ring and between the inner side of the larger outer diameter of the inner ring and the inner side of the second inner ring. Each retainer has three evenly distributed pockets in a mesh pattern, and steel balls are installed in the pockets. This design can achieve axial bidirectional thrust loads through the inner ring and the second inner ring; however, it also suffers from the problem of uneven wear at both ends of the radial rollers.

[0006] In conclusion, combining radial and axial load bearings and avoiding or reducing inconsistent wear can effectively improve the service life of such bearings. Summary of the Invention

[0007] The purpose of this invention is to provide a composite bearing to solve the problems existing in the prior art. By aligning the force center of the first rolling element with the radial range of the radial support portion, the load can be transmitted along the axial direction of the radial support portion when the first rolling element is subjected to axial load. This avoids or reduces the overturning torque of the radial support portion caused by the axial load, reduces the degree of uneven wear at both ends of the second rolling element, and improves the service life of the composite bearing.

[0008] To achieve the above objectives, the present invention provides the following solution: This invention provides a composite bearing, comprising a first support ring, a first rolling element, and a second support ring arranged sequentially along the axial direction. The second support ring includes an axial support portion and a radial support portion connected to each other. The axial support portion extends radially, and the radial support portion extends axially. The first rolling element is tactilely connected between the first support ring and the axial support portion and is used to bear axial loads. A second rolling element is disposed on the inner diameter side of the radial support portion and is tactilely connected between the installation location and the radial support portion. The second rolling element is used to bear radial loads, and the axial force center of the first rolling element corresponds to the radial range of the radial support portion.

[0009] Preferably, the first rolling element is a ball, and the axial support portion has a first annular groove on the side facing the first support ring for the ball to roll.

[0010] Preferably, the first support ring includes a first annular body, and the side of the first annular body facing the axial support portion is provided with a second annular groove for the ball to roll.

[0011] Preferably, the device includes a first retainer disposed between the first support ring and the axial support portion. The first retainer includes a bottom ring and an inner ring and an outer ring respectively connected to the inner diameter side and the outer diameter side of the bottom ring. The bottom ring has a plurality of first limiting holes arranged circumferentially, and the ball is located in the first limiting holes. The diameter of the first limiting holes is smaller than the diameter of the ball.

[0012] Preferably, the bottom ring is disposed close to the first support ring, and the inner ring and the outer ring extend axially toward the axial support portion.

[0013] Preferably, the second rolling element is a roller, and the device further includes a second cage, wherein the roller is mounted in the second cage.

[0014] Preferably, the axial support extends radially toward the inner diameter side of the radial support to form an axial limiting structure, and the end of the second retainer abuts against the axial limiting structure.

[0015] Preferably, the second retainer includes a second annular body, and a plurality of second limiting holes are provided circumferentially on the side wall of the second annular body. The second limiting holes extend axially, and the roller is located in the second limiting holes.

[0016] Preferably, the width of the second limiting hole through the outer diameter surface of the second annular body is smaller than the width of the second limiting hole through the inner diameter surface of the second annular body, and both widths are smaller than the diameter of the roller, so that the roller directly contacts the part to be installed.

[0017] Preferably, the outer diameter surface of the radial support is provided with a third annular groove, and an oil injection hole that radially penetrates the radial support is provided in the third annular groove.

[0018] The present invention achieves the following technical effects compared to the prior art: (1) By aligning the force center of the first rolling element with the radial range of the radial support, the present invention can transmit the load along the axial direction of the radial support when the first rolling element is subjected to axial load, thereby avoiding or reducing the overturning torque of the radial support caused by the axial load, thus reducing the degree of uneven wear at both ends of the second rolling element and improving the service life of the composite bearing. (2) The first rolling element of the present invention is a ball bearing. A first annular groove and a second annular groove are respectively provided on the axial support part and the first support ring for the ball bearing to roll. The first annular groove and the second annular groove can constrain the rolling path of the ball bearing, so that the ball bearing can maintain the stability of the relative position when it is subjected to axial load, and avoid the ball bearing from falling off the composite bearing and causing damage. In addition, a first retainer is also provided. The first retainer constrains the circumferential spacing of the ball bearing, avoids the ball bearing from touching each other, and reduces the frictional loss and collision and squeezing damage to the ball bearing. (3) The bottom ring of the first cage of the present invention is located close to the first support ring, and its inner ring and outer ring extend axially toward the axial support part. That is, the first limiting hole of the first cage for limiting the position of the ball is located close to the first support ring. This position is located away from the radial support part bearing the radial load. When the radial support part is subjected to radial load, it can provide sufficient space for the ball to move. On the basis of ensuring that the ball is effectively constrained, it can also provide a certain margin of movement to ensure the stability of the composite bearing operation. (4) The second rolling element of the present invention is a roller and also includes a second cage. The second cage constrains the position of the roller so that the roller can maintain relative position stability when bearing radial load. In addition, the axial support part forms an axial limiting structure, which constrains the axial position of the second cage and ensures the position stability of the roller when the ball bears axial load. (5) The present invention provides a second limiting hole for mounting rollers on the second cage. The rollers are confined inside by the second limiting hole, which can better constrain the position of the rollers, so that the rollers can directly contact the part to be installed without the need to set the bearing inner ring, thereby reducing the manufacturing cost of the composite bearing. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 for Figure 1 Axial cross-sectional structural schematic diagram; Figure 3 for Figure 1 Explosion structure diagram; Figure 4 This is a schematic diagram of the first cage structure of the present invention; Figure 5 This is a schematic diagram of the second cage structure of the present invention; Figure 6 for Figure 5 A schematic diagram of the radial cross-sectional structure; Figure 7 This is a schematic diagram of the second support ring structure of the present invention; The components are as follows: 1. First support ring; 11. First annular body; 12. Second annular groove; 2. First cage; 21. Bottom ring; 211. First limiting hole; 22. Inner ring; 23. Outer ring; 3. First rolling element; 4. Second support ring; 41. Axial support part; 411. First annular groove; 412. Axial limiting structure; 42. Radial support part; 421. Third annular groove; 422. Oil injection hole; 5. Second cage; 51. Second annular body; 52. Second limiting hole; 6. Second rolling element. Detailed Implementation

[0021] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0022] The purpose of this invention is to provide a composite bearing to solve the problems existing in the prior art. By aligning the force center of the first rolling element with the radial range of the radial support portion, the load can be transmitted along the axial direction of the radial support portion when the first rolling element bears an axial load. This avoids or reduces the overturning torque of the radial support portion caused by the axial load, reduces the degree of uneven wear at both ends of the second rolling element, and improves the service life of the composite bearing.

[0023] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0024] like Figures 1-7As shown, the present invention provides a composite bearing, comprising a first support ring 1, a first rolling element 3, and a second support ring 4 arranged sequentially along the axial direction. The first support ring 1 is circular and is used to connect an axially positioned support component or load. The second support ring 4 is also circular, with its inner diameter side used for mounting at the installation location (e.g., on a rotating shaft or a support shaft). The first rolling element 3 can be cylindrical or spherical, providing rolling support. The second support ring 4 includes an axial support portion 41 and a radial support portion 42 connected to each other. The axial support portion 41 extends radially, while the radial support portion 42 extends axially. The radial thickness of the axial support portion 41 is greater than the radial thickness of the radial support portion 42, and the axial width of the radial support portion 42 is greater than the axial width of the axial support portion 41. The first rolling element 3 is tactilely connected between the first support ring 1 and the axial support portion 41, bearing the axial load and reducing frictional loss. A second rolling element 6, which can be cylindrical or spherical, is provided on the inner diameter side of the radial support portion 42 to provide rolling support. The second rolling element 6 is rolled between the installation part and the radial support part 42. It can directly contact the installation part or be installed on the installation part through the bearing inner ring. The second rolling element 6 bears the radial load and reduces friction loss. The axial force center of the first rolling element 3 corresponds to the radial range of the radial support part 42. That is, the first rolling element 3 can be closer to the second rolling element 6 in the radial direction (the diameter range is closer). When the first rolling element 3 bears the axial load, it can transmit the load along the axial direction of the radial support part 42. The axial force center of the first rolling element 3 is far away from the second rolling element 6, which will not cause an increase in the overturning torque of the second rolling element 6. This can avoid or reduce the overturning torque of the radial support part 42 caused by the axial load, thereby reducing the degree of uneven wear at both ends of the second rolling element 6 and ultimately improving the service life of the composite bearing.

[0025] like Figures 2-4 and Figure 7 As shown, the first rolling element 3 can be a ball. A first annular groove 411 for the ball to roll is provided on the side of the axial support portion 41 facing the first support ring 1. The first annular groove 411 is coaxial with the rotation center of the composite bearing, and the maximum width of the first annular groove 411 is smaller than the diameter of the ball. The first annular groove 411 constrains the rolling path of the ball, ensuring relative positional stability when the ball is subjected to axial load, thus preventing the ball from detaching from the composite bearing and causing damage.

[0026] like Figure 2 and Figure 3As shown, the first support ring 1 includes a first annular body 11. A second annular groove 12 for the rolling of the balls is provided on the side of the first annular body 11 facing the axial support portion 41. The second annular groove 12 is coaxial with the rotation center of the composite bearing. The maximum width of the second annular groove 12 is smaller than the diameter of the balls. The width and diameter of the second annular groove 12 and the first annular groove 411 can be consistent. The second annular groove 12, together with the first annular groove 411, can constrain the rolling path of the balls, maintaining relative positional stability when the balls are subjected to axial loads, thus preventing the balls from detaching from the composite bearing and causing damage.

[0027] like Figures 2-4 As shown, the device includes a first retainer 2, which is disposed between the axial support portions 41 of the first support ring 1 and the second support ring 4. The first retainer 2 includes a bottom ring 21, an inner ring 22 connected to the inner diameter side of the bottom ring 21, and an outer ring 23 connected to the outer diameter side of the bottom ring 21. The bottom ring 21, the inner ring 22, and the outer ring 23 form an annular groove with a U-shaped cross-section. Multiple first limiting holes 211 are circumferentially arranged on the bottom surface of the bottom ring 21, i.e., the bottom surface of the annular groove. The balls are located within the first limiting holes 211, which constrain the balls. The diameter of the first limiting holes 211 is smaller than the diameter of the balls, thus confining the balls within the U-shaped groove. By using the first retainer 2 to constrain the circumferential spacing between the balls, contact between the balls can be avoided, reducing frictional wear and collision / compression damage to the balls.

[0028] like Figures 2-4 As shown, the bottom ring 21 of the first cage 2 is located close to the first support ring 1, while the inner ring 22 and outer ring 23 extend axially towards the axial support portion 41 of the second support ring 4. At this time, the bottom surface of the U-shaped annular groove faces the first support ring 1, and the opening faces the second support ring 4. The first limiting hole 211 of the first cage 2, used to limit the position of the balls, is located close to the first support ring 1 because it is located on the bottom ring 21. At this time, the first limiting hole 211 is located away from the radial support portion 42 of the second support ring 4, which bears the radial load. When the radial support portion 42 is subjected to radial load runout or vibration, it can provide sufficient movement space for the balls. Therefore, through the above-described structure of the first cage 2, it is possible to provide a certain amount of movement margin while ensuring that the balls are effectively constrained, thus ensuring the stability of the composite bearing operation.

[0029] like Figures 2-3 , Figures 5-6As shown, the second rolling element 6 can be a roller, with its axial direction aligned with that of the second support ring 4. It may also include a second cage 5, in which the roller is mounted. The second cage 5 constrains the position of the roller, ensuring relative positional stability when subjected to radial loads. This prevents contact between rollers, reducing frictional wear and impact damage.

[0030] like Figure 2 and Figure 7 As shown, the axial support portion 41 of the second support ring 4 extends radially toward the inner diameter side of the radial support portion 42 to form an axial limiting structure 412. After the second retainer 5 is installed inside the second support ring 4, the end of the second retainer 5 can abut against the axial limiting structure 412. The axial position of the second retainer 5 is constrained by the axial limiting structure 412, so that the second retainer 5 and its rollers will not move axially when the ball bears axial load, thereby ensuring the positional stability of the second retainer 5 and the rollers.

[0031] like Figure 3 , Figure 5 and Figure 6 As shown, the second cage 5 includes a second annular body 51. A plurality of second limiting holes 52 are provided circumferentially on the side wall of the second annular body 51. Each second limiting hole 52 extends axially. Rollers are installed in the second limiting holes 52. In order to ensure that the rollers play a better rolling support role, the radial thickness of the second cage 5 should be less than the diameter of the rollers, so that the rollers can contact the radial support part 42 of the second support ring 4 and can contact the bearing inner ring or the part to be installed.

[0032] like Figure 5 and Figure 6 As shown, the width of the second limiting hole 52 through the outer diameter surface of the second annular body 51 is smaller than the width of the second limiting hole 52 through the inner diameter surface of the second annular body 51. Both widths are smaller than the diameter of the roller, so that the second limiting hole 52 can confine the roller inside it, better constrain the position of the roller, and thus allow the roller to directly contact the part to be installed without the need to set the bearing inner ring, thereby reducing the manufacturing cost of the composite bearing.

[0033] like Figure 2 and Figure 7As shown, the outer diameter surface of the radial support portion 42 of the second support ring 4 is provided with a third annular groove 421. An oil injection hole 422, radially penetrating the radial support portion 42, is provided within the third annular groove 421. Lubricating oil can enter the interior of the second support ring 4 through the oil injection hole 422 to lubricate the second rolling element 6. The third annular groove 421 communicates with the oil injection hole 422. After installing the second support ring 4, as long as the oil passage is connected to the third annular groove 421, the oil passage and the oil injection hole 422 can be connected. Therefore, it is not necessary to accurately locate the oil injection hole 422 to lubricate the interior of the second support ring 4, thus improving the ease of installation of the second support ring 4.

[0034] Specific examples have been used to illustrate the principles and implementation methods of this invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of this invention. Furthermore, those skilled in the art will recognize that, based on the ideas of this invention, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of this invention.

Claims

1. A composite bearing, characterized in that: The device includes a first support ring, a first rolling element, and a second support ring arranged sequentially along the axial direction. The second support ring includes an axial support portion and a radial support portion connected to each other. The axial support portion extends radially, and the radial support portion extends axially. The first rolling element is tactilely connected between the first support ring and the axial support portion and is used to bear axial loads. A second rolling element is provided on the inner diameter side of the radial support portion and is tactilely connected between the installation location and the radial support portion. The second rolling element is used to bear radial loads. The axial force center of the first rolling element corresponds to the radial range where the radial support portion is located, and the first rolling element can be closer to the second rolling element in the radial direction. The first rolling element is a ball, and the axial support portion has a first annular groove on the side facing the first support ring for the ball to roll. It also includes a first retainer, which is disposed between the first support ring and the axial support portion. The first retainer includes a bottom ring and an inner ring and an outer ring respectively connected to the inner diameter side and the outer diameter side of the bottom ring. The bottom ring is provided with a plurality of first limiting holes along the circumferential direction. The ball is located in the first limiting hole, and the diameter of the first limiting hole is smaller than the diameter of the ball. The bottom ring is located close to the first support ring, and the inner ring and the outer ring extend axially toward the axial support portion; The first support ring includes a first annular body, and the side of the first annular body facing the axial support portion is provided with a second annular groove for the ball to roll.

2. The composite bearing according to claim 1, characterized in that: The second rolling element is a roller, and the second cage is also included, with the roller mounted inside the second cage.

3. The composite bearing according to claim 2, characterized in that: The axial support extends radially toward the inner diameter side of the radial support to form an axial limiting structure, and the end of the second retainer abuts against the axial limiting structure.

4. The composite bearing according to claim 2, characterized in that: The second retainer includes a second annular body, and a plurality of second limiting holes are provided circumferentially on the side wall of the second annular body. The second limiting holes extend axially, and the roller is located in the second limiting holes.

5. The composite bearing according to claim 4, characterized in that: The width of the second limiting hole through the outer diameter surface of the second annular body is smaller than the width of the second limiting hole through the inner diameter surface of the second annular body. Both widths are smaller than the diameter of the roller, and the roller directly contacts the part to be installed.

6. The composite bearing according to claim 5, characterized in that: The outer diameter surface of the radial support is provided with a third annular groove, and an oil injection hole that radially penetrates the radial support is provided in the third annular groove.

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