Joint bearing
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- CORE MOTION MEDICAL ROBOT (SHENZHEN) CO LTD
- Filing Date
- 2024-08-21
- Publication Date
- 2026-06-02
Smart Images
Figure CN118998202B_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of medical device technology, and in particular to a joint bearing. Background Technology
[0002] Spherical plain bearings are a type of sliding bearing that can rotate and oscillate at any angle during operation. Due to their high load capacity, impact resistance, corrosion resistance, wear resistance, self-aligning properties, and good lubrication, they are widely used in medium to large-sized equipment requiring high loads and rigidity (such as electrically driven operating tables, six-bearing load platforms, and lifting equipment). However, existing spherical plain bearings cannot have their clearance and resistance adjusted after leaving the factory, causing difficulties in equipment debugging. Furthermore, the clearance and resistance cannot be adjusted according to the bearing's wear level. Therefore, once the bearing wears out, it needs to be replaced, leading to increased costs. Summary of the Invention
[0003] Therefore, it is necessary to provide a spherical bearing to address the aforementioned technical problems.
[0004] A spherical plain bearing, comprising:
[0005] Ball head;
[0006] The bearing housing is provided with a ball socket, the ball socket allowing the ball head to be rotatably disposed in the bearing housing;
[0007] A spring sheet is disposed on the bearing housing. The spring sheet has a pressing portion, at least a portion of which is located at the opening of the ball socket. The spring sheet is deformable so that the pressing portion can press against the ball head.
[0008] A first adjusting member is capable of pushing against the spring to deform it.
[0009] In one embodiment, the spring is arranged in a ring shape; the pressing part is arranged in a ring shape along the circumference of the spring, or, the pressing part is provided in multiple portions and is arranged at intervals around the circumference of the spring.
[0010] In one embodiment, the spring has a first through hole, and the bearing seat has a first threaded hole corresponding to the first through hole;
[0011] The first adjusting member has a first threaded portion and a first pushing portion connected together. The first threaded portion can pass through the first through hole and be threaded into the first threaded hole so that the first pushing portion can push against the spring piece.
[0012] In one embodiment, the bearing housing has a first end face, the opening of the ball socket is located on the first end face, the spring piece has a deformation gap with the first end face, and the first screw hole is provided on the first end face; the spring piece also has a second screw hole, the second screw hole and the first through hole are offset from each other along the circumference of the spring piece, and the second screw hole can be screwed into the first screwed part.
[0013] The first screw hole allows the first adjusting member to be screwed to the bearing seat through the first screw connection portion, so that the first pushing portion can push the spring piece toward the direction close to the first end face; the first adjusting member can also pass through the second screw hole and abut against the first end face, and the second screw hole can also be screwed to the first screw connection portion, so that the spring piece can be pushed away from the first end face.
[0014] In one embodiment, the bearing housing has a first end face, the opening of the ball socket is located on the first end face, the spring piece has a deformation gap with the first end face, and the first screw hole is provided on the first end face; the spring piece also has a second screw hole, the second screw hole and the first through hole are offset from each other along the circumference of the spring piece; the spherical bearing further includes a second adjusting member, the second adjusting member having a second screw connection portion that can cooperate with the second screw hole;
[0015] The first screw hole allows the first adjusting member to be screwed to the bearing seat through the first screw connection portion, so that the first pushing portion can push the spring piece toward the direction close to the first end face; the second adjusting member can pass through the second screw hole and abut against the first end face, and the second screw hole can also be screwed to the second screw connection portion, so that the spring piece can be pushed away from the first end face.
[0016] In one embodiment, the first through hole is a screw hole that is screwed into the first screwed part, and the spring piece can rotate relative to the bearing seat along the circumference of the spring piece so that the first through hole can be misaligned with the corresponding first screw hole; the first adjusting member can also abut against the bearing seat through the first through hole misaligned with the first screw hole, the first through hole is for the first screwed part to be screwed in, and the spring piece is pushed away from the bearing seat.
[0017] In one embodiment, the bearing housing has a first end face, the opening of the ball socket is located on the first end face, and the first screw hole is provided on the first end face; the spherical bearing further includes an annular mounting member, the mounting member is provided on the bearing housing and can rotate relative to the bearing housing, the spring is provided on the radial inner side of the mounting member, and there is a deformation gap between the spring and the first end face, so that the spring can deform in a direction closer to the first end face.
[0018] In one embodiment, the mounting member is provided with a plurality of second through holes, which are spaced apart circumferentially along the mounting member. The bearing seat is provided with a third threaded hole corresponding to the second through holes. The spherical bearing further includes a plurality of first screws, which can pass through the second through holes and be screwed to the bearing seat through the third threaded holes. The mounting member can rotate relative to the bearing seat by a preset angle, so that the second through holes and the third threaded holes remain corresponding, while the first through holes and the first threaded holes are offset.
[0019] Alternatively, the mounting component may have at least two snaps in the circumferential direction, the bearing seat may have a slot, the mounting component may be able to rotate relative to the bearing seat by a preset angle, and the snaps may be able to engage with the slots, while the first through hole and the first screw hole may be offset.
[0020] In one embodiment, the connection position between the mounting member and the spring piece is provided with a first groove, the opening of the first groove facing the first end face and communicating with the deformation gap; and / or
[0021] The spring is arranged in a ring shape; a first sealing ring is provided between the spring and the first end face, and / or a second sealing ring is provided between the spring and the ball head.
[0022] In one embodiment, the pressing portion has a first transition section and abutting section, the abutting section being closer to the inside of the socket than the first transition section; in the depth direction of the socket, the diameter of the first transition section in the circumferential direction along the opening of the socket gradually decreases; the abutting section abuts against the ball head, the abutting section having an arc surface matching the ball head, and in the depth direction of the socket, the diameter of the arc surface of the abutting section in the circumferential direction along the opening of the socket gradually increases.
[0023] In the aforementioned spherical plain bearing, since at least a portion of the pressing part is located in the opening of the ball socket, after the ball head is installed in the ball socket, by adjusting the first adjusting member, the spring can be pushed and deformed so that the pressing part on the spring presses against the ball head, thereby reducing the gap between the ball head and the pressing part, thereby achieving the purpose of adjusting the bearing clearance and solving the problems of mismatch between the ball head and the ball socket caused by machining errors, assembly, etc., and the problem of increased clearance caused by working wear. Attached Figure Description
[0024] Figure 1 This is a three-dimensional structural diagram of the first type of spherical bearing provided in Embodiment 1 of this application.
[0025] Figure 2 for Figure 1 An exploded view of the provided spherical bearing.
[0026] Figure 3 for Figure 1 A top view of the provided spherical bearing.
[0027] Figure 4 for Figure 3 The provided cross-sectional view of the spherical bearing at point AA.
[0028] Figure 5 for Figure 1 A three-dimensional structural diagram of the spring sheet of the provided spherical bearing, viewed from the front.
[0029] Figure 6 for Figure 1 A three-dimensional structural diagram of the spring sheet of the provided spherical bearing, viewed from the reverse side.
[0030] Figure 7 for Figure 1 A three-dimensional structural diagram of the bearing housing for the provided spherical plain bearing.
[0031] Figure 8 for Figure 4 A magnified schematic diagram of the joint bearing at point B is provided.
[0032] Figure 9 for Figure 1 A top view of the provided spring clip.
[0033] Figure 10 for Figure 9 The provided cross-sectional view of the spring clip at CC.
[0034] Figure 11 for Figure 10 The provided diagram shows an enlarged view of the spring at point D.
[0035] Figure 12 This is a three-quarter cross-sectional view of the second type of spherical bearing provided in Embodiment 2 of this application.
[0036] The labels in the attached diagram are explained as follows:
[0037] 10. Spherical plain bearing; 100. Ball end; 200. Bearing housing; 210. Ball socket; 211. Opening; 220. First threaded hole; 230. First end face; 240. Third threaded hole; 250. Oil groove; 300. Spring piece; 310. Pressing part; 311. First transition section; 312. Abutting section; 313. Boundary line; 320. First through hole; 330. Second threaded hole; 340. Second groove; 400. First adjusting member; 410. First threaded part; 420. First pushing part; 500. Second adjusting member; 520. Second pushing part; 600. Mounting member; 610. Second through hole; 700. First screw; 800. Extending shaft; Q. Deformation clearance; P. First groove; R. Clearance space. Detailed Implementation
[0038] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.
[0039] In the description of this application, it should be understood that if terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.
[0040] Furthermore, where the terms "first" and "second" appear, these terms are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, where the term "multiple" appears, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.
[0041] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.
[0042] In this application, unless otherwise expressly specified and limited, the use of descriptions such as "above" or "below" the second feature indicates that the first and second features are in direct contact or indirect contact via an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. Similarly, "below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.
[0043] It should be noted that if an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. If an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. If so, the terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application are for illustrative purposes only and do not represent the only possible implementation.
[0044] Example 1
[0045] like Figures 1 to 4 As shown, this embodiment provides a spherical plain bearing 10, which may include a ball head 100, a bearing housing 200, a spring 300, and a first adjusting member 400. The bearing housing 200 has a ball socket 210, which allows the ball head 100 to be rotatably disposed on the bearing housing 200. The spring 300 is disposed on the bearing housing 200. The spring 300 has a pressing portion 310, at least a portion of which is located in the opening 211 of the ball socket 210. The spring 300 is deformable so that the pressing portion 310 can press against the ball head 100. The first adjusting member 400 can push against the spring 300 to deform it.
[0046] After the spherical plain bearing 10 is assembled, at least a portion of the ball head 100 is located within the ball socket 210. Since at least a portion, such as half or all, of the pressing portion 310 is located within the opening 211 of the ball socket 210, the pressing portion 310 abuts against the surface of the ball head 100. If there is a slight mismatch between the ball head 100 and the ball socket 210 due to manufacturing reasons, the spring 300 can deform, allowing the pressing portion 310 to change its contact force with the ball head 100 due to the deformation of the spring 300. Therefore, the contact between the pressing portion 310 and the ball head 100 can improve the mismatch between the ball head 100 and the ball socket 210, enhancing the assembly self-adaptability. During subsequent continuous operation, the ball head 100 and the ball socket 210 wear and become more compatible. Simultaneously, after the mismatch between the ball head 100 and the ball socket 210, and after wear reaches a certain level after operation, [the following applies]. The spring 300 can be pushed by the first adjusting member 400 to deform the spring 300. After deformation, the contact force between the pressing part 310 of the spring 300 and the ball head 100 will change. For example, if the contact force between the pressing part 310 of the spring 300 and the ball head 100 increases, the clearance will decrease, and the ball head 100 and the ball socket 210 will be more tightly assembled, thereby pressing the ball head; while if the contact force between the pressing part 310 of the spring 300 and the ball head 100 decreases, the clearance will increase, thereby relaxing the ball head 100 and realizing the function of adjusting the clearance of the spherical bearing 10.
[0047] The spherical bearing 10 can be used in surgical robots, for example, it can be mounted on the operating table of a surgical robot. The operating table may include a base, a movable seat, and multiple linear motion modules; each linear motion module is connected to the base and the movable seat. The linear motion modules are capable of outputting linear motion, such as electric actuators, hydraulic actuators, or pneumatic actuators. Each linear motion module has a mounting end and an output end. One of the mounting end and the output end is universally connected to the movable seat via the spherical bearing 10, and the other is connected to the base; or, one of the mounting end and the output end is universally connected to the base via the spherical bearing 10, and the other is connected to the movable seat. Of course, the spherical bearing 10 can also be used in medium to large-sized equipment that needs to withstand high loads and requires high rigidity, such as six-bearing load-bearing platforms and lifting equipment.
[0048] Considering the stability of equipment operation, in one embodiment, after the spring 300 is assembled with the bearing housing 200, the center of the ball head 100 must be lower than the surface of the spring 300 facing away from the bearing housing 200, that is, the center of the ball head 100 is not exposed to the external environment. This allows the spring 300 to stop the ball head 100 in the axial direction of the bearing housing 200, which can prevent the ball head 100 from falling off the ball socket 210 of the bearing housing 200, thereby ensuring that the ball head 100 can rotate stably relative to the bearing housing 200 within the ball socket 210. Therefore, when the pressing part 310 of the spring 300 moves away from the depth of the opening 211 of the ball socket 210, the gap between the pressing part 310 and the outer wall of the ball head 100 will become larger and larger; while when the pressing part 310 of the spring 300 moves towards the depth of the opening 211 of the ball socket 210, the gap between the pressing part 310 and the outer wall of the ball head 100 will become smaller and smaller, thereby realizing the adjustment of the bearing clearance.
[0049] During use, bearings may experience excessive or insufficient clearance due to manufacturing processes. Conversely, after a period of use, bearing clearance may increase due to wear. To address insufficient clearance, the first adjusting member 400 can be adjusted to deform the spring 300, allowing the pressing portion 310 on the spring 300 to move away from the depth of the opening 211 of the ball socket 210. This increases the gap between the ball head 100 and the pressing portion 310, thereby increasing the bearing clearance and loosening the ball head 100. Conversely, to address excessive or increased clearance, the first adjusting member 400 can be adjusted to deform the spring 300, allowing the pressing portion 310 on the spring 300 to move towards the depth of the opening 211 of the ball socket 210. This decreases the gap between the ball head 100 and the pressing portion 310, thereby reducing the bearing clearance.
[0050] As can be seen, by adjusting the first adjusting member 400, the spring 300 of the spherical bearing 10 can be deformed, so that the pressing part 310 on the spring 300 can move away from or closer to the depth of the opening 211 of the ball socket 210. This can increase or decrease the gap between the ball head 100 and the pressing part 310, thereby increasing or decreasing the bearing clearance. This can solve the problems of mismatch between the ball head 100 and the ball socket 210 caused by machining errors, assembly, etc., and the problem of increased clearance caused by working wear.
[0051] In one embodiment, the spring 300 may be fixed to the bearing housing 200, for example, by means of a screw.
[0052] like Figure 5 and Figure 6As shown, in this embodiment, the spring piece 300 is arranged in a ring shape. The pressing part 310 is arranged in a ring shape along the circumference of the spring piece 300. This arrangement of the pressing part 310 allows it to press the ball head 100 in all directions (360°) along the circumference of the opening 211 of the ball socket 210, thereby enabling the ball head 100 to rotate stably relative to the bearing in the ball socket 210; at the same time, it also allows the circumferential regions of the ball head 100 to have approximately the same clearance after adjusting the bearing clearance.
[0053] Of course, multiple pressing parts 310 can also be provided and spaced circumferentially around the spring piece 300. In this way, the pressing parts can press the ball head 100 in all directions along the circumference of the opening 211 of the ball socket 210. The specific number of pressing parts 310 can be set according to the requirements, as long as it can ensure that the ball head 100 can rotate stably in the ball socket 210 relative to the bearing.
[0054] In this embodiment, the spring 300 has a first through hole 320 (see...) Figure 5 and Figure 6 The bearing housing 200 has a first threaded hole 220 corresponding to the first through hole 320 (see...). Figure 7 ).like Figure 8 As shown, the first adjusting member 400 has a first threaded portion 410 and a first pushing portion 420 connected together. The first threaded portion 410 can pass through the first through hole 320 and be threaded into the first threaded hole 220, so that the first pushing portion 420 can push against the spring piece 300. The length of the first adjusting member 400 screwed into the first threaded hole 220 determines the extent to which the pressing portion 310 on the spring piece 300 can move towards the depth direction of the opening 211 near the ball socket 210. Therefore, the bearing clearance can be adjusted by adjusting the depth of the first adjusting member 400 screwed into the first threaded hole 220. This application, by screwing the first adjusting member 400 into the first threaded hole 220, allows for continuous adjustment of the length of the first adjusting member 400 screwed into the first threaded hole 220, enabling continuous adjustment of the bearing clearance. Thus, the bearing clearance can be adjusted to any preset value as needed.
[0055] Multiple first through holes 320 can be provided along the circumference of the spring piece 300. First screw holes 220 are correspondingly provided with the first through holes 320. Multiple first adjusting members 400 are also provided, each corresponding to one of the first through holes 320 and the first screw holes 220. With this arrangement, multiple first adjusting members 400 can cause the spring piece 300 to deform in multiple circumferential directions along the opening 211 of the ball socket 210, thereby allowing the pressing part 310 to press against multiple positions of the ball head 100, thus adjusting the clearance.
[0056] Preferably, the first through hole 320 and the first screw hole 220 are evenly arranged along the circumference of the spring piece 300. The specific number of the first through hole 320 and the first screw hole 220 can be set according to the requirements, for example, it can be 10 or 8.
[0057] In a certain situation, such as Figure 2 As shown, the spring 300 is in a horizontal state, at which point the assembled pressing part 310 just abuts against the ball head 100, providing the bearing with appropriate clearance. However, in some cases, although the spring 300 is in a horizontal state, the contact force between the pressing part 310 and the ball head 100 is too large, thus affecting the normal operation of the bearing. In this case, although the first adjusting member 400 can pass through the first through hole 320 and be screwed into the first screw hole 220, thereby securing the pressing part 310 in... Figure 2 By pressing down on the lower edge of the screen, the clearance can be reduced, but it cannot be increased. Therefore, it is necessary to consider how to increase the clearance between the ball socket 210 and the ball head 100 to loosen the ball head 100. To this end, in one embodiment, such as... Figure 7 As shown, the bearing housing 200 has a first end face 230. The opening 211 of the ball socket 210 is located on the first end face 230. A deformation gap Q is present between the spring piece 300 and the first end face 230 (see [reference]). Figure 8 The first screw hole 220 is located on the first end face 230. (For example...) Figure 5 , Figure 6 , Figure 9 and Figure 10 As shown, the spring piece 300 also has a second screw hole 330, which is offset from the first through hole 320 along the circumference of the spring piece 300, and the second screw hole 330 can be screwed into the first screw connection part 410. The first screw hole 220 allows the first adjusting member 400 to be screwed into the bearing seat 200 through the first screw connection part 410, so that the first pushing part 420 can push the spring piece 300 towards the first end face 230 to reduce the clearance; the first adjusting member 400 can also pass through the second screw hole 330 and abut against the first end face 230, and the second screw hole 330 can also be screwed into the first screw connection part 410, so that the spring piece 300 can be pushed away from the first end face 230 to increase the clearance.
[0058] When it is necessary to reduce the bearing clearance, simply screw the first screw part 410 of the first adjusting member 400 into the first screw hole 220 of the bearing housing 200 for adjustment. When it is necessary to increase the bearing clearance, the first threaded part 410 of the first adjusting member 400 is first unscrewed from the first threaded hole 220 of the bearing housing 200 and taken out from the first through hole 320. Then it is screwed into the second threaded hole 330. Since the bearing housing 200 does not have a hole that mates with the second threaded hole 330, during the screwing process of the first threaded part 410 of the first adjusting member 400 and the second threaded hole 330, the first threaded part 410 of the first adjusting member 400 will press against the first end face 230 of the bearing housing 200 at a certain moment. When it presses further, the first threaded part 410 of the first adjusting member 400 is equivalent to pushing the spring piece 300 to deform in a direction away from the first end face 230. At this time, the first pushing part 420 of the spring piece 300 moves in a direction away from the first end face 230, so that the gap between the first pushing part 420 and the ball head 100 increases, thereby achieving the purpose of increasing the clearance. Of course, when the first screw part 410 is already at a certain depth inside the first screw hole 220, when it rotates in the direction of moving out of the first adjusting member 400, the pressure of the first pushing part 420 on the spring piece 300 is reduced, the deformation of the spring piece 300 is slightly repaired, and it can also play the role of increasing the clearance and relaxing the ball head 100.
[0059] The second screw hole 330 and the first through hole 320 can be evenly alternately arranged along the circumference of the spring piece 300. The number of the second screw hole 330 and the first through hole 320 is the same. The specific number of the second screw hole 330 can be set according to the number of the first through hole 320.
[0060] like Figure 11 As shown, in this embodiment, the pressing part 310 has a first transition section 311 and abutting section 312. The abutting section 312 is closer to the inner side of the ball socket 210 relative to the first transition section 311, where the inner side refers to the deeper side of the ball socket 210. In the depth direction of the ball socket 210, the diameter of the first transition section 311 along the circumferential direction of the opening 211 of the ball socket 210 gradually decreases, so that the ball head 100 can be more easily fitted into the ball socket 210. The abutting section 312 abuts against the ball head 100. The abutting section 312 has an arc surface that matches the ball head 100. In the depth direction of the ball socket 210, the diameter of the arc surface of the abutting section 312 along the circumferential direction of the opening 211 of the ball socket 210 gradually increases, so that after the spring piece 300 is pressed and moves in the depth direction of the ball socket 210, the pressing part 310 can more effectively press against the ball head 100, thereby achieving effective adjustment of the clearance. Wherein, the depth direction of the socket 210 or the depth direction of the opening 211 of the socket 210 is... Figure 10 and Figure 11 The direction indicated by the X-axis is shown.
[0061] Furthermore, the first transition section 311 allows the pressing part 310 of the spring 300 to move smoothly toward the first end face 230 of the bearing seat 200 when pressed, without directly contacting and being blocked by the outer surface of the ball head 100. In other words, the first transition section 311 plays a role in avoiding the downward movement of the pressing part 310. The abutting section 312 allows the pressing part 310 of the spring 300 to effectively press against the outer wall of the ball head 100, ensuring the stable rotation of the ball head 100 within the ball socket 210. The abutting section 312 is designed with an arc surface structure that matches the ball head 100, which increases the contact area between the abutting section 312 and the outer wall of the ball head 100, thus improving the pressing effect of the pressing part 310 on the ball head 100.
[0062] It should be pointed out again that, see Figure 11 The first transition section 311 and the abutment section 312 are separated by a boundary line 313. The diameter of the ball head 100 at the boundary line 313 is smaller than the diameter of the ball head 100. Furthermore, in the direction opposite to the depth direction of the ball socket 210, the diameter of the cross-sectional circle of the portion of the ball head 100 above the boundary line 313 gradually decreases, meaning that the diameter of this portion of the ball head 100 is largest at the boundary line 313. Conversely, in the direction opposite to the depth direction of the ball socket 210, the diameter of the first transition section 311 along the circumference of the opening 211 of the ball socket 210 (referred to as the diameter of the first transition section 311) gradually increases, meaning that the diameter of the first transition section 311 is smallest at the boundary line 313. This allows a clearance space R to be formed between the first transition section 311 and the ball head 100 (see...). Figure 8 The clearance space R can help to avoid the downward movement of the fragment 300.
[0063] like Figures 1 to 7 As shown, in this embodiment, the opening 211 of the ball socket 210 is located on the first end face 230. The spherical plain bearing 10 also includes a ring-shaped mounting member 600, which is disposed on the bearing housing 200. The spring piece 300 is disposed on the radially inner side of the mounting member 600. When the bearing clearance is increased by the first adjusting member 400, since the first adjusting member 400 is not connected to the bearing housing 200, the spring piece 300 can be indirectly fixed on the bearing housing 200 by fixing the mounting member 600 on the bearing housing 200, so that the gap between the pressing part 310 and the ball head 100 remains unchanged.
[0064] Among them, such as Figure 5 , Figure 6 and Figure 9 As shown, the mounting component 600 may be provided with a plurality of second through holes 610, which are spaced apart circumferentially along the mounting component 600. The bearing housing 200 is provided with a third screw hole 240 corresponding to the second through holes 610 (see...). Figure 7 ).like Figure 1 and Figure 3 As shown, the spherical plain bearing 10 also includes a plurality of first screws 700, which can pass through the second through hole 610 and be screwed to the bearing housing 200 through the third screw hole 240. This fixing method facilitates the assembly and disassembly of the mounting component 600.
[0065] Of course, the mounting component 600 may also have at least two snaps in the circumferential direction, and the bearing housing 200 may have a slot, in which the snaps are engaged to achieve the fixation of the mounting component 600 and the bearing housing 200.
[0066] The mounting component 600 can be connected to the spring 300 by welding, integral molding, or other methods. The mounting component 600 and the spring 300 can be made of the same material, such as wear-resistant metals like aluminum alloy.
[0067] To facilitate the deformation of the shrapnel 300, such as Figure 6 , Figure 8 and Figure 10 As shown, a first groove P is provided at the connection position between the mounting component 600 and the spring piece 300. The opening of the first groove P faces the first end face 230 and communicates with the deformation gap Q. The first groove P can reduce the rigidity of the connection position between the mounting component 600 and the spring piece 300, which is beneficial to the deformation of the spring piece 300. The first groove P can be provided around the circumference of the spring piece 300.
[0068] like Figure 7 As shown, in this embodiment, the inner wall of the ball socket 210 is provided with an oil groove 250. The oil groove 250 is used to store lubricating oil, so that the bearing has a lubrication function. The specific structure of the oil groove 250 can be set according to the requirements. For example, an oil groove 250 can be set around the bottom of the ball socket 210, or it can be set as follows. Figure 7 As shown, multiple oil grooves 250 are provided on the inner sidewall of the ball socket 210, and each oil groove 250 extends from the opening 211 of the ball socket 210 to the bottom of the ball socket 210.
[0069] To prevent lubricant leakage, in this embodiment, the spring 300 is arranged in a ring shape, and a first sealing ring (not shown in the figure) is provided between the spring 300 and the first end face 230 of the bearing housing 200. The first sealing ring is used to seal the gap between the spring 300 and the bearing housing 200.
[0070] The first sealing ring can be disposed in the first groove P, meaning that the first groove P not only allows the spring piece 300 to deform but also serves to accommodate the first sealing ring. The first sealing ring can be fixed to the first groove P by means of adhesive bonding or other methods, or it can be directly placed in the first groove P.
[0071] To further prevent lubricant leakage, in this embodiment, a second sealing ring (not shown in the figures) is provided between the spring 300 and the ball head 100. The second sealing ring seals the gap between the spring 300 and the ball head 100. It should be noted that the second sealing ring can deform radially along the spring 300, meaning it primarily functions as a seal in the radial direction of the spring 300. The movement of the pressing portion 310 towards or away from the first end face 230 of the bearing housing 200 will have a slight impact on the sealing effect of the second sealing ring, but this effect is negligible.
[0072] Among them, such as Figure 8 As shown, a second groove 340 is provided on the surface of the spring piece 300 near the inner side of the ball socket 210. The second groove 340 communicates with the deformation gap Q and is used to accommodate the second sealing ring. The second sealing ring can be fixed in the second groove 340 by means of bonding or other methods, or it can be directly placed in the second groove 340.
[0073] like Figure 1 , Figure 2 and Figure 4 As shown, this embodiment also includes an extension shaft 800, which is connected to the ball head 100. The extension shaft 800 can serve as a connecting component of the spherical bearing 10 for connection with related components of the operating table, such as the base or movable seat of the operating table.
[0074] Example 2
[0075] like Figure 12 As shown, this embodiment provides a spherical bearing 10. Unlike the spherical bearing 10 provided in Embodiment 1, the spherical bearing 10 in this embodiment includes not only a first adjusting member 400, but also a second adjusting member 500. That is, the first adjusting member 400 presses the spring piece 300 towards the depth direction of the ball socket 210 to reduce the bearing clearance, while the second adjusting member 500 presses the spring piece 300 away from the depth direction of the ball socket 210 to increase the bearing clearance.
[0076] Specifically, such as Figure 12As shown, in this embodiment, the bearing housing 200 has a first end face 230, and the opening 211 of the ball socket 210 is located on the first end face 230. A gap exists between the spring piece 300 and the first end face 230, allowing the spring piece 300 to deform towards the first end face 230. A first threaded hole 220 is provided on the first end face 230. The spring piece 300 also has a second threaded hole 330, which is offset from the first through hole 320 circumferentially. The spherical bearing 10 further includes a second adjusting member 500, which has a second threaded portion capable of engaging with the second threaded hole 330. The first threaded hole 220 allows the first adjusting member 400 to be threaded onto the bearing housing 200 via the first threaded portion 410, so that the first pushing portion 420 can push the spring piece 300 towards the first end face 230. The second adjusting member 500 can be inserted into the second screw hole 330 and abut against the first end face 230, and the second screw hole 330 can also be screwed to the second screw connection part so that the spring piece 300 can be pushed away from the first end face 230.
[0077] When it is necessary to reduce the bearing clearance, simply screw the first screw part 410 of the first adjusting member 400 into the first screw hole 220 of the bearing housing 200 for adjustment. When it is necessary to increase the bearing clearance, firstly, the first threaded portion 410 of the first adjusting member 400 is unscrewed at least from the first threaded hole 220, so that the first threaded portion 410 is not threaded with the first threaded hole 220. Then, the second threaded portion of the second adjusting member 500 is threaded with the second threaded hole 330. Since the bearing housing 200 does not have a hole that mates with the second threaded hole 330, during the process of threading the second threaded portion of the second adjusting member 500 with the second threaded hole 330, the second threaded portion of the second adjusting member 500 will press against the first end face 230 of the bearing housing 200 at a certain moment. When it presses further, the second threaded portion of the second adjusting member 500 is equivalent to pushing the spring 300 to deform in a direction away from the first end face 230. At this time, the first pushing portion 420 of the spring 300 moves in a direction away from the first end face 230, so that the gap between the first pushing portion 420 and the ball head 100 increases, thereby achieving the purpose of increasing the clearance.
[0078] Example 3
[0079] This embodiment provides a spherical bearing 10. Unlike the spherical bearing 10 provided in Embodiment 1, the spherical bearing 10 in this embodiment does not have a second screw hole 330 on the spring plate 300, and the first through hole 320 is a screw hole. The spring plate 300 and the bearing seat 200 can be detachably fixed. The bearing clearance can be increased or decreased by rotating the spring plate 300 and fixing it.
[0080] Specifically, in this embodiment, the first through hole 320 is a screw hole that is screwed into the first screwed part 410. The spring piece 300 can rotate relative to the bearing seat 200 along the circumference of the spring piece 300 so that the first through hole 320 can be misaligned with the corresponding first screw hole 220. The first adjusting member 400 can also abut against the bearing seat 200 through the first through hole 320 misaligned with the first screw hole 220. The first through hole 320 is for the first screwed part 410 to be screwed in, and the spring piece 300 is pushed away from the bearing seat 200.
[0081] The spring 300 and the bearing housing 200 are detachably fixed, and the spring 300 and the bearing housing 200 have at least a first fixed state and a second fixed state. During assembly, the spring piece 300 is rotated relative to the bearing housing 200 to align the first through hole 320 with the first threaded hole 220. Then, the spring piece 300 is fixed to the bearing housing 200, placing them in a first fixed state. When the bearing clearance needs to be reduced, the first threaded portion 410 of the first adjusting member 400 is screwed into the corresponding first threaded hole 220 through the first through hole 320. The first pushing portion 420 pushes the pressing portion 310 of the spring piece 300 towards the depth of the ball socket 210, increasing the pressing force on the ball head 100 and thus reducing the clearance. When the bearing clearance needs to be increased, the first threaded portion 410 of the first adjusting member 400 is first unscrewed from the corresponding first threaded hole 220. Then, the spring piece 300 and bearing housing 200 are placed in a first fixed state, allowing the spring piece 300 to rotate relative to the bearing housing 200. Subsequently, the spring piece 300 is... When the spring piece 300 rotates relative to the bearing seat 200, and the first through hole 320 is misaligned with the corresponding first screw hole 220, the first screw part 410 of the first adjusting member 400 cannot be screwed into the corresponding first screw hole 220, but can press against the bearing seat 200 in the depth direction toward the ball socket 210. At this time, the spring piece 300 is fixed to the bearing seat 200 and is in a second fixed state. At this time, the first adjusting member 400 is rotated so that the first adjusting member 400 moves in the depth direction toward the ball socket 210, so that the front end of the first screw part 410 of the first adjusting member 400 presses against the first end face 230. When the first adjusting member 400 continues to rotate in the same direction, the spring piece 300 will deform in the depth direction away from the ball socket 210 under the screw drive of the first screw part 410 and the first through hole 320, thereby driving the pressing part 310 to loosen the ball head 100, thereby increasing the clearance.
[0082] Correspondingly, in this embodiment, the mounting member 600 is rotatable relative to the bearing housing 200, and when the mounting member 600 rotates a preset angle relative to the bearing housing 200, the second through hole 610 and the third screw hole 240 remain aligned, while the first through hole 320 and the first screw hole 220 are misaligned. This ensures that when the bearing clearance is increased by the second adjusting member 500, since the second adjusting member 500 is not connected to the bearing housing 200, the mounting member 600 can be fixed to the bearing housing 200 by the first screw 700, so that the gap between the pressing part 310 and the ball head 100 remains unchanged.
[0083] It should be noted that if the mounting part 600 is fixed to the bearing seat 200 by means of a buckle and a slot, the mounting part 600 can rotate relative to the bearing seat 200 by a preset angle, and the buckle can be engaged with the slot, while the first through hole 320 and the first screw hole 220 are offset.
[0084] For example, the spring 300 has four first through holes 320 evenly arranged in its circumference, that is, one first through hole 320 is arranged at every 90° interval, and the mounting part 600 has six second through holes 610 evenly arranged in its circumference, that is, one second through hole 610 is arranged at every 60° interval. When it is necessary to increase the bearing clearance, first unscrew the first adjusting member 400 from the first screw hole 220, and then rotate the mounting member 600 by 60° so that the second through hole 610 on the mounting member 600 is aligned with the corresponding third screw hole 240 on the bearing housing 200. The mounting member 600 can be fixed to the bearing housing 200 using the first screw 700. However, since the first through holes 320 are distributed at 90° intervals, after the spring piece 300 rotates 60° with the mounting member 600, the first through hole 320 on the spring piece 300 will inevitably be misaligned with the corresponding first screw hole 220 on the bearing housing 200. At this time, the first adjusting member 400 cannot be screwed into the first screw hole 220 of the bearing housing 200 through the first through hole 320, but it can press against the bearing housing 200 to achieve the purpose of increasing the clearance.
[0085] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.
[0086] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.
Claims
1. A spherical plain bearing, characterized in that, include: Ball head; The bearing housing is provided with a ball socket, the ball socket allowing the ball head to be rotatably disposed in the bearing housing; A spring sheet is disposed on the bearing housing. The spring sheet has a pressing portion, at least a portion of which is located at the opening of the ball socket. The spring sheet is deformable so that the pressing portion can press against the ball head. A first adjusting member is capable of pushing against the spring sheet to deform the spring sheet; The spring sheet has a first through hole, and the bearing seat has a first threaded hole corresponding to the first through hole; The first adjusting member has a first threaded portion and a first pushing portion connected together. The first threaded portion can pass through the first through hole and be threaded into the first threaded hole, so that the first pushing portion can push against the spring piece. The first through hole is a threaded hole that is threaded into the first threaded part. When it is necessary to increase the clearance of the bearing, the first threaded part of the first adjusting member is first unscrewed from the corresponding first threaded hole, and then the spring piece and the bearing seat are in a first fixed state. The spring piece can rotate relative to the bearing seat along the circumference of the spring piece so that the first through hole can be misaligned with the corresponding first threaded hole. After the first through hole is misaligned with the corresponding first threaded hole, the spring piece and the bearing seat are fixed and in a second fixed state. The first adjusting member can also abut against the bearing seat through the first through hole misaligned with the first threaded hole. The first through hole is for the first threaded part to be threaded, and the spring piece is pushed away from the bearing seat.
2. The spherical plain bearing according to claim 1, characterized in that, The spring sheet is arranged in a ring shape; the pressing part is arranged in a ring shape along the circumference of the spring sheet, or, the pressing part is provided in multiple places and is arranged at intervals around the circumference of the spring sheet.
3. The spherical plain bearing according to claim 1, characterized in that, The bearing housing has a first end face, the opening of the ball socket is located on the first end face, and the first screw hole is provided on the first end face; the spherical bearing further includes an annular mounting member, the mounting member is provided on the bearing housing and can rotate relative to the bearing housing, the spring is provided on the radial inner side of the mounting member, and there is a deformation gap between the spring and the first end face, so that the spring can deform in a direction closer to the first end face.
4. The spherical bearing according to claim 3, characterized in that, The mounting component is provided with a plurality of second through holes, which are spaced apart circumferentially along the mounting component. The bearing housing is provided with a third threaded hole corresponding to the second through holes. The spherical bearing also includes a plurality of first screws, which can pass through the second through holes and be screwed to the bearing housing through the third threaded holes. The mounting component can rotate relative to the bearing housing by a preset angle, so that the second through holes and the third threaded holes remain corresponding, while the first through holes and the first threaded holes are offset. Alternatively, the mounting component may have at least two snaps in the circumferential direction, the bearing seat may have a slot, the mounting component may be able to rotate relative to the bearing seat by a preset angle, and the snaps may be able to engage with the slots, while the first through hole and the first screw hole may be offset.
5. The spherical plain bearing according to claim 3, characterized in that, The mounting component has a first groove at the connection position with the spring piece, the opening of the first groove facing the first end face and communicating with the deformation gap; and / or The spring is arranged in a ring shape; a first sealing ring is provided between the spring and the first end face, and / or a second sealing ring is provided between the spring and the ball head.
6. The spherical plain bearing according to any one of claims 1 to 5, characterized in that, The pressing part has a first transition section and abutting section, the abutting section being closer to the inside of the ball socket than the first transition section; in the depth direction of the ball socket, the diameter of the first transition section along the circumferential direction of the opening of the ball socket gradually decreases; the abutting section abuts against the ball head, the abutting section having an arc surface matching the ball head, and in the depth direction of the ball socket, the diameter of the arc surface of the abutting section along the circumferential direction of the opening of the ball socket gradually increases.