Self-aligning roller bearing capable of superposing thrust and heavy-load miniaturized electric cylinder
By designing a spherical roller bearing that can superimpose thrust, the axial load is dispersed into two routes and borne by multiple roller elements, which solves the problem of bearings being unable to superimpose axial loads in existing technologies and realizes the application of miniaturized and high-load-capacity electric cylinders.
Patent Information
- Application Number
- CN202423309249.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-31
- Publication Date
- 2025-10-10
- Estimated Expiration
- 2034-12-31
AI Technical Summary
Existing thrust roller bearings cannot effectively superimpose axial loads under high load conditions and cannot be used in miniaturized electric cylinders. A single bearing bears the full load, resulting in the structure being unable to be miniaturized.
A spherical roller bearing with superimposed thrust is designed. By setting up a supporting inner ring and a supporting outer ring, the axial load is dispersed into two transmission routes. The first and second roller members bear part of the load respectively, avoiding damage to each roller individually and realizing superimposed load sharing.
The load-bearing capacity of the bearing is improved, a miniaturized structure is achieved, and it is easy to install in a heavy-load miniaturized electric cylinder, broadening the application scenarios.
Smart Images
Figure CN223424449U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of bearings, and in particular to a spherical roller bearing capable of superimposing thrust and a heavy-load miniaturized electric cylinder. Background Art
[0002] Bearings are crucial components in mechanical equipment, their primary function being to support rotating bodies, reduce friction during movement, and ensure rotational accuracy. Thrust roller bearings, a specialized type of bearing, can withstand combined axial and radial loads, primarily axial, while also exhibiting self-aligning properties.
[0003] In order to enable electric cylinders to be used in high-load working scenarios, a high-load electric cylinder currently has a thrust roller bearing installed in the electric cylinder to assist in bearing the axial load, ensuring that the electric cylinder can work stably under high-load conditions. However, the load that a single thrust roller bearing can withstand is limited, and existing thrust roller bearings cannot be combined to achieve axial load superposition. Even if multiple thrust roller bearings are installed in the electric cylinder at the same time, each thrust roller bearing must withstand the full load force. This means that the existing thrust roller bearings can only increase their radial width to increase their load capacity, making them unsuitable for use in small-volume electric cylinders. Utility Model Content
[0004] In response to the deficiencies in the prior art, the present application provides a spherical roller bearing capable of superimposing thrust and a heavy-load miniaturized electric cylinder.
[0005] A spherical roller bearing with superimposed thrust disclosed in the present application includes: a first bearing member, a support member and a second bearing member; the first bearing member includes a first bearing upper cover, a first roller member and a first bearing lower cover, the first bearing upper cover is pressed against the first roller member, and the first roller member is rotatably arranged on the first bearing lower cover; the support member includes a support inner ring and a support outer ring, the support inner ring is passed through the first bearing lower cover and the first roller member, and one end of the support inner ring is abutted against the first bearing upper cover, and one end of the support outer ring is abutted against the first bearing lower cover; the second bearing member includes a second bearing upper cover, a second roller member and a second bearing lower cover, the second bearing upper cover is pressed against the second roller member, the second roller member is rotatably arranged on the second bearing lower cover, the other end of the support outer ring is abutted against the second bearing upper cover, the support outer ring is arranged outside the second bearing upper cover and the second roller member, and the other end of the support outer ring is abutted against the second bearing lower cover.
[0006] Preferably, there is a gap between the first bearing lower cover and the second bearing upper cover.
[0007] Preferably, a first annular raceway is provided on the surface of the first bearing lower cover, and a second annular raceway is provided on the bottom of the first bearing upper cover. The first bearing upper cover presses the first roller member against the surface of the first bearing lower cover, and allows the roller of the first roller member to roll between the first raceway and the second raceway.
[0008] Preferably, the first roller member includes a retaining frame and multiple rollers, and the multiple rollers are arranged in the retaining frame in sequence. The first bearing upper cover presses the retaining frame and the multiple rollers against the surface of the first bearing lower cover. The multiple rollers roll between the first raceway and the second raceway, and the supporting inner ring is passed through the first bearing lower cover and the retaining frame.
[0009] Preferably, the retaining frame is provided with a plurality of roller grooves, the plurality of roller grooves are sequentially spaced apart on the surface of the retaining frame, and the plurality of rollers are rotatably disposed in the plurality of roller grooves respectively.
[0010] Preferably, the first raceway, the second raceway and the plurality of rollers are all inclined toward the central axis of the retaining frame.
[0011] Preferably, there is a gap between the support outer ring and the second bearing upper cover.
[0012] Preferably, the support inner ring, the first bearing upper cover and the second bearing upper cover are an integrally formed structure or a split structure.
[0013] Preferably, the support outer ring, the first bearing lower cover and the second bearing lower cover are an integrally formed structure or a split structure.
[0014] The present application also discloses a heavy-load miniaturized electric cylinder comprising a spherical roller bearing capable of superimposing thrust.
[0015] The beneficial effect of the present application is that: through the setting of the support inner ring and the support outer ring, the axial load is dispersed into two routes for transmission. Part of the load is transmitted in sequence through the first bearing upper cover, the support inner ring, the second bearing upper cover, the second roller member and the second bearing lower cover, and the other part of the load is transmitted in sequence through the first bearing upper cover, the first roller member, the first bearing lower cover, the support outer ring and the second bearing lower cover. In this way, the axial load is dispersed, so that the first roller member and the second roller member cooperate to share the axial load, thereby respectively bearing part of the axial load, avoiding damage caused by the first roller member or the second roller member bearing it alone, and improving the load-bearing capacity of the present application. That is to say, through the design of superimposed layered force, the first bearing member and the second bearing member cooperate to share the axial load, so that the load that the present application can withstand is doubled. Compared with traditional thrust roller bearings, the overall structure is more miniaturized, and there is no need to increase its radial width to increase its load-bearing capacity. It is convenient to be installed in a heavy-load miniaturized electric cylinder with vertical load, which broadens the application scenarios. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:
[0017] Figure 1 A cross-sectional view of a spherical roller bearing capable of superimposing thrust in an embodiment;
[0018] Figure 2 1 is an exploded view of a spherical roller bearing capable of superimposing thrust in an embodiment.
[0019] Reference numerals:
[0020] 1. First bearing component; 11. First bearing upper cover; 111. Second raceway; 12. First roller component; 121. Retainer; 122. Roller; 13. First bearing lower cover; 131. First raceway; 2. Support component; 21. Support inner ring; 22. Support outer ring; 3. Second bearing component; 31. Second bearing upper cover; 32. Second roller component; 33. Second bearing lower cover. DETAILED DESCRIPTION
[0021] The following diagrams illustrate various embodiments of the present application. For clarity, many practical details will be included in the following description. However, it should be understood that these practical details are not intended to limit the present application. In other words, in some embodiments of the present application, these practical details are not essential. Furthermore, to simplify the drawings, some conventional structures and components are depicted in a simplified schematic manner.
[0022] It should be noted that all directional indications such as up, down, left, right, front, back, etc. in the embodiments of the present application are only used to explain the relative position relationship, movement status, etc. between the various components in a certain specific posture as shown in the accompanying drawings. If the specific posture changes, the directional indication will also change accordingly.
[0023] In addition, in this application, descriptions such as "first" and "second" are only used for descriptive purposes and do not specifically refer to the order or ranking, nor are they used to limit this application. They are only used to distinguish components or operations described with the same technical terms, and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in this field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by this application.
[0024] In order to further understand the application content, features and effects of this application, the following embodiments are given as examples and described in detail with reference to the accompanying drawings.
[0025] Example 1:
[0026] Reference Figure 1 , Figure 1 The figure is a cross-sectional view of a spherical roller bearing capable of superimposing thrust in an embodiment. The spherical roller bearing capable of superimposing thrust in this embodiment includes a first bearing component 1, a support component 2, and a second bearing component 3. The first bearing component 1 comprises a first bearing upper cover 11, a first roller component 12, and a first bearing lower cover 13. The first bearing upper cover 11 is pressed against the first roller component 12, which is rotatably mounted on the first bearing lower cover 13. The support component 2 comprises a support inner ring 21 and a support outer ring 22. The support inner ring 21 is disposed within the first bearing lower cover 13 and the first roller component 12, with one end of the support inner ring 21 abutting the first bearing upper cover 11, and one end of the support outer ring 22 abutting the first bearing lower cover 13. The second bearing component 3 includes a second bearing upper cover 31, a second roller component 32 and a second bearing lower cover 33. The second bearing upper cover 31 is pressed against the second roller component 32. The second roller component 32 is rotatably arranged on the second bearing lower cover 33. The other end of the support outer ring 22 is in contact with the second bearing upper cover 31. The support outer ring 22 is arranged outside the second bearing upper cover 31 and the second roller component 32, and the other end of the support outer ring 22 is in contact with the second bearing lower cover 33.
[0027] When the spherical roller bearing capable of superimposing thrust in this embodiment is subjected to an axial load, the axial load is dispersed into two routes for transmission through the arrangement of the supporting inner ring 21 and the supporting outer ring 22. A portion of the load is transmitted in sequence through the first bearing upper cover 11, the supporting inner ring 21, the second bearing upper cover 31, the second roller member 32 and the second bearing lower cover 33, and the other portion of the load is transmitted in sequence through the first bearing upper cover 11, the first roller member 12, the first bearing lower cover 13, the supporting outer ring 22 and the second bearing lower cover 33. In this way, the axial load is dispersed, so that the first roller member 12 and the second roller member 12 are connected to each other. The two roller members 32 cooperate to share the axial load, thereby respectively bearing a part of the axial load, avoiding damage caused by the first roller member 12 or the second roller member 32 bearing the load alone, thereby improving the load-bearing capacity of this embodiment. That is to say, through the design of superimposed layered force, the first bearing member 1 and the second bearing member 3 cooperate to share the axial load, so that the load that this embodiment can withstand is doubled. Compared with traditional thrust roller bearings, the overall structure is more miniaturized, and there is no need to increase its radial width to improve the load-bearing capacity. It is easy to install in a heavy-duty miniaturized electric cylinder with vertical load, which broadens the application scenarios.
[0028] Reference Figure 2 , Figure 2This is an exploded view of a spherical roller bearing capable of superimposing thrust in an embodiment. Preferably, an annular first raceway 131 is defined on the surface of the first bearing lower cover 13, and an annular second raceway 111 is defined on the bottom of the first bearing upper cover 11. The first bearing upper cover 11 presses the first roller element 12 against the surface of the first bearing lower cover 13, allowing the roller 122 of the first roller element 12 to roll between the first raceway 131 and the second raceway 111. In a specific application, the first bearing lower cover 13 is stationary, and the first roller element 12 can rotate on the surface of the first bearing lower cover 13 about its own central axis. The first bearing upper cover 11 presses against the first roller element 12 and rotates synchronously with the first roller element 12. The first raceway 131 and the second raceway 111 are both annular, arcuate surfaces. The roller 122 of the first roller element 12 simultaneously contacts and rolls relative to the first raceway 131 and the second raceway 111. The inner wall of the first bearing upper cover 11, the inner wall of the support inner ring 21, and the inner wall of the second bearing upper cover 31 are flush and cooperate to form a mounting hole for mounting an external rotating shaft. Specifically, the specific structures of the second bearing upper cover 31, the second roller element 32, and the second bearing lower cover 33 are identical to those of the first bearing upper cover 11, the first roller element 12, and the first bearing lower cover 13, respectively, and are not further described here.
[0029] Re-reference Figure 2 Preferably, the first roller member 12 includes a retainer 121 and a plurality of rollers 122, and the plurality of rollers 122 are arranged in a ring-shaped manner at intervals on the retainer 121. The first bearing upper cover 11 presses the retainer 121 and the plurality of rollers 122 against the surface of the first bearing lower cover 13, and the plurality of rollers 122 roll between the first raceway 131 and the second raceway 111, and the support inner ring 21 is passed through the first bearing lower cover 13 and the retainer 121. In specific applications, the rotation of the rotating shaft drives the synchronous rotation of the first bearing upper cover 11. The rotating shaft also applies an axial load to the first bearing upper cover 11, causing the first bearing upper cover 11 to abut against the multiple rollers 122 and press them against the surface of the first bearing lower cover 13. This causes the retainer 121 to rotate synchronously with the first bearing upper cover 11, and the multiple rollers 122 simultaneously contact the first raceway 131 and the second raceway 111 and roll relative to each other, thereby reducing the friction between the first roller member 12 and the first bearing upper cover 11 and the first bearing lower cover 13. Specifically, the retainer 121 is provided with multiple roller grooves, which are sequentially spaced and arranged on the surface of the retainer 121. The multiple rollers 122 are respectively rotated in the multiple roller grooves. The arrangement of the retainer 121 and the roller grooves provides support for the multiple rollers 122, while also ensuring that the spacing between the multiple rollers 122 is fixed, thereby improving the stability and accuracy of the rolling of the rollers 122. Specifically, the structure of the second roller member 32 is similar to that of the first roller member 12 , and will not be described again here.
[0030] Re-reference Figure 1and Figure 2 Preferably, the first raceway 131, the second raceway 111, and the plurality of rollers 122 are all inclined toward the central axis of the retainer 121. In specific applications, since the position of the first bearing lower cover 13 is fixed, the inclined arrangement of the first raceway 131 is equivalent to forming an arc-shaped groove on the surface of the first bearing lower cover 13, and the first bearing upper cover 11 and the first roller member 12 extend into the arc-shaped groove. At the same time, the first bearing upper cover 11 and the first roller member 12 have the freedom to swing in the arc-shaped groove, that is, they can achieve a self-aligning effect, thereby adapting to the errors caused by the non-concentricity and shaft deflection between the rotating shaft and the bearing, and improving stability.
[0031] Re-reference Figure 1 and Figure 2 Preferably, a gap is provided between the first bearing lower cover 13 and the second bearing upper cover 31. In specific applications, the first and second bearing lower covers 13 and 33 are both stationary, while the second bearing upper cover 31 rotates about the axis of the rotating shaft. By separating the first and second bearing lower covers 13 and 31, friction and scratches between the second bearing upper cover 31 and the first bearing lower cover 13 are prevented during rotation, improving rotational stability and smoothness, and extending service life. Furthermore, a gap is provided between the support outer ring 22 and the second bearing upper cover 31. Similarly, the second bearing lower cover 33 and the support outer ring 22 are both stationary, while the second bearing upper cover 31 rotates about the axis of the rotating shaft. Separating the support outer ring 22 from the second bearing upper cover 31 prevents friction and scratches between the second bearing upper cover 31 and the support outer ring 22 during rotation, improving rotational stability and smoothness, and extending service life. Specifically, there is also a gap between the support inner ring 21 and the first bearing lower cover 113 .
[0032] Re-reference Figure 1 and Figure 2Preferably, the support inner ring 21, the first bearing upper cover 11, and the second bearing upper cover 31 are split-type structures. The support outer ring 22, the first bearing lower cover 13, and the second bearing lower cover 33 are either integrally formed or split-type structures. In specific applications, the first bearing upper cover 11, the first roller member 12, the first bearing lower cover 13, the support inner ring 21, the support outer ring 22, the second bearing upper cover 31, the second roller member 32, and the second bearing lower cover 33 in this embodiment are all split-type structures, that is, they are all independent components. During installation and application, the second bearing lower cover 33 is fixed within the bearing seat, the second roller member 32 is rotatably mounted on the surface of the second bearing lower cover 33, the second bearing upper cover 31 is mounted on the surface of the second roller member 32, and the support outer ring 22 is sleeved around the second roller member 32 and the second bearing lower cover 33 and fixedly connected to the bearing seat. The first bearing lower cover 13 abuts the surface of the support outer ring 22 and is fixedly connected to the bearing seat. The support inner ring 21 is inserted into the first bearing lower cover 13 and abuts one end of the support inner ring 21 with the second bearing upper cover 31. The first roller element 12 is rotatably mounted on the surface of the first bearing lower cover 13. The first bearing upper cover 11 abuts the first roller element 12 and the support inner ring 21, respectively, and the rotating shaft is installed in the mounting hole. This split-structure design facilitates the assembly and installation of the spherical roller bearing with superimposed thrust, while also facilitating disassembly and repair, making installation and maintenance convenient. Of course, in other embodiments, the support inner ring 21, the first bearing upper cover 11, and the second bearing upper cover 31 can be integrally formed. Since the support inner ring 21, the first bearing upper cover 11, and the second bearing upper cover 31 all need to rotate synchronously during operation, the integral structure can improve the synchronization of rotation and enhance the rigidity and stability of the overall structure, preventing disassembly. Similarly, in other embodiments, the supporting outer ring 22, the first bearing lower cover 13 and the second bearing lower cover 33 are an integrally formed structure. Since the supporting outer ring 22, the first bearing lower cover 13 and the second bearing lower cover 33 do not rotate, the integrally formed structure can improve the rigidity of the overall structure.
[0033] The operating process and principle of the spherical roller bearing with superimposed thrust in this embodiment are as follows: The rotation of the rotating shaft drives the first bearing upper cover 11, the support inner ring 21, and the second bearing upper cover 31 to rotate synchronously. The rotating shaft also applies an axial load to the first bearing upper cover 11, causing the first bearing upper cover 11 to press the first roller element 21 against the surface of the first bearing lower cover 13. In this way, the rotation of the first bearing upper cover 11 drives the first roller element 21 to rotate on the surface of the first bearing lower cover 13. On the other hand, the axial load of the first bearing upper cover 11 is also transmitted to the second bearing upper cover 31 through the support inner ring 21, causing the second bearing upper cover 31 to press the second roller element 21 against the surface of the second bearing lower cover 33. In this way, the rotation of the second bearing upper cover 31 drives the second roller element 32 to rotate on the surface of the second bearing lower cover 33.
[0034] The axial load transmission path of the spherical roller bearing capable of superimposing thrust in this embodiment is as follows: The rotating shaft also applies an axial load to the first bearing upper cover 11. This axial load on the first bearing upper cover 11 is dispersed and transmitted along two paths. The first path is where the axial load on the first bearing upper cover 11 is transmitted sequentially through the support inner ring 21, the second bearing upper cover 31, the second roller element 32, and the second bearing lower cover 33. The second path is where the axial load on the first bearing upper cover 11 is transmitted sequentially through the first roller element 12, the first bearing lower cover 13, the support outer ring 22, and the second bearing lower cover 33.
[0035] Example 2:
[0036] The heavy-duty miniaturized electric cylinder in this embodiment includes the spherical roller bearing with superimposed thrust of the first embodiment, a motor, a coupling, a screw, a nut, a cylinder barrel, and a piston rod. The motor is located at one end of the cylinder barrel. The screw is located within the cylinder barrel and is connected to the drive shaft of the motor via the coupling. The nut is sleeved around the screw. The piston rod is sleeved around the screw, with one end of the piston rod connected to the nut and the other end extending outward from the cylinder barrel. The first bearing cover 11, the support inner ring 21, and the second bearing cover 31 are sleeved around the screw. It can be understood that the provision of the spherical roller bearing with superimposed thrust enables the heavy-duty miniaturized electric cylinder to withstand greater axial loads. Furthermore, the design of superimposed layered force distribution eliminates the need to increase the radial width of the bearing to increase load-bearing capacity, thereby effectively reducing the radial width of the electric cylinder barrel, achieving maximum miniaturization while still being able to withstand heavy loads.
[0037] In summary, by setting the supporting inner ring 21 and the supporting outer ring 22, the axial load is dispersed into two routes for transmission. One part of the load is transmitted in sequence through the first bearing upper cover 11, the supporting inner ring 21, the second bearing upper cover 31, the second roller member 32 and the second bearing lower cover 33, and the other part of the load is transmitted in sequence through the first bearing upper cover 11, the first roller member 12, the first bearing lower cover 13, the supporting outer ring 22 and the second bearing lower cover 33. In this way, the axial load is dispersed, so that the first roller member 12 and the second roller member 32 cooperate to share the axial load. load, thereby respectively bearing part of the axial load, avoiding damage caused by the first roller member 12 or the second roller member 32 bearing it alone, thereby improving the load-bearing capacity of this embodiment. That is to say, through the design of superimposed layered force, the first bearing member 1 and the second bearing member 3 cooperate to share the axial load, so that the load that this embodiment can withstand is doubled. Compared with traditional thrust roller bearings, the overall structure is more miniaturized, and there is no need to increase its radial width to improve the load-bearing capacity. It is easy to install in a heavy-duty miniaturized electric cylinder with vertical load, which broadens the application scenarios.
[0038] The above is only an embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application should be included within the scope of the claims of the present application.
Claims
1. A spherical roller bearing capable of superimposing thrust, characterized in that: include: A first bearing member (1) comprises a first bearing upper cover (11), a first roller member (12) and a first bearing lower cover (13), wherein the first bearing upper cover (11) is pressed against the first roller member (12), and the first roller member (12) is rotatably mounted on the first bearing lower cover (13); a support member (2), comprising a support inner ring (21) and a support outer ring (22), wherein the support inner ring (21) is inserted into the first bearing lower cover (13) and the first roller member (12), and one end of the support inner ring (21) abuts against the first bearing upper cover (11), and one end of the support outer ring (22) abuts against the first bearing lower cover (13); and The second bearing member (3) comprises a second bearing upper cover (31), a second roller member (32) and a second bearing lower cover (33); the second bearing upper cover (31) is pressed against the second roller member (32); the second roller member (32) is rotatably arranged on the second bearing lower cover (33); the other end of the support outer ring (22) abuts against the second bearing upper cover (31); the support outer ring (22) is arranged outside the second bearing upper cover (31) and the second roller member (32), and the other end of the support outer ring (22) abuts against the second bearing lower cover (33).
2. The spherical roller bearing capable of superimposing thrust according to claim 1, characterized in that: There is a gap between the first bearing lower cover (13) and the second bearing upper cover (31).
3. The spherical roller bearing capable of superimposing thrust according to claim 1, characterized in that: The surface of the first bearing lower cover (13) is provided with an annular first raceway (131), and the bottom of the first bearing upper cover (11) is provided with an annular second raceway (111). The first bearing upper cover (11) presses the first roller member (12) against the surface of the first bearing lower cover (13), and enables the roller (122) of the first roller member (12) to roll between the first raceway (131) and the second raceway (111).
4. The spherical roller bearing capable of superimposing thrust according to claim 3, characterized in that: The first roller member (12) includes a retainer (121) and a plurality of rollers (122), wherein the plurality of rollers (122) are sequentially arranged in an interval ring on the retainer (121), and the first bearing upper cover (11) presses the retainer (121) and the plurality of rollers (122) against the surface of the first bearing lower cover (13), and the plurality of rollers (122) roll between the first raceway (131) and the second raceway (111), and the support inner ring (21) is passed through the first bearing lower cover (13) and the retainer (121).
5. The spherical roller bearing capable of superimposing thrust according to claim 4, characterized in that: The retaining frame (121) is provided with a plurality of roller grooves, the plurality of roller grooves are sequentially arranged at intervals on the surface of the retaining frame (121), and the plurality of rollers (122) are rotatably arranged in the plurality of roller grooves respectively.
6. The spherical roller bearing capable of superimposing thrust according to claim 4, characterized in that: The first raceway (131), the second raceway (111) and the plurality of rollers (122) are all inclined toward the central axis of the retaining frame (121).
7. The spherical roller bearing capable of superimposing thrust according to claim 1, characterized in that: There is a gap between the supporting outer ring (22) and the second bearing upper cover (31).
8. The spherical roller bearing capable of superimposing thrust according to claim 1, characterized in that: The supporting inner ring (21), the first bearing upper cover (11) and the second bearing upper cover (31) are an integrally formed structure or a split structure.
9. The spherical roller bearing capable of superimposing thrust according to claim 1, characterized in that: The supporting outer ring (22), the first bearing lower cover (13) and the second bearing lower cover (33) are an integrally formed structure or a split structure.
10. A heavy-duty miniaturized electric cylinder, characterized in that: The invention comprises a spherical roller bearing capable of superimposing thrust as claimed in any one of claims 1 to 9.