Radial spherical plain bearing
By designing annular limiting grooves and limiting parts in centripetal joint bearings, the adjustment of the rotation degree of freedom is achieved, and the problem of the inability to adjust the rotation degree of freedom in the prior art is solved, providing better flexibility and adaptability.
Patent Information
- Application Number
- CN202422366769.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-27
- Publication Date
- 2025-06-17
- Estimated Expiration
- 2034-09-27
AI Technical Summary
Existing centripetal joint bearings cannot adjust the rotational degree of freedom, lack flexibility, and cannot meet the needs of certain special application conditions.
A centripetal joint bearing is designed. By opening an annular limit groove on the outer spherical surface of the inner ring and movably setting a limit member on the outer ring, the limit member can be switched and adjusted between the first state position where the annular limit groove is snapped into and the second state position where the annular limit groove is withdrawn, and the rotation degree of freedom of the inner ring relative to the outer ring is adjusted through the limit coordination.
It realizes flexible adjustment of the rotation degree of freedom of centripetal joint bearings, and can be adapted according to different working conditions, providing good rotation degree of freedom of adjustment effect.
Smart Images
Figure CN222991939U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of bearings, and particularly relates to a spherical plain bearing. Background Art
[0002] A spherical plain bearing is a key component in mechanical equipment, mainly enabling a component to have multiple rotational degrees of freedom while bearing a load, and can rotate or swing around different axes respectively. However, in some special application conditions, the component only needs two rotational degrees of freedom, and the remaining rotational degrees of freedom need to be restricted. However, the existing ordinary spherical plain bearings cannot adjust the number of rotational degrees of freedom, lacking the flexibility to adjust the number of rotational degrees of freedom. Content of the Utility Model
[0003] Aiming at the deficiencies of the prior art, the utility model provides a spherical plain bearing, which mainly solves the technical problem that the number of rotational degrees of freedom of the existing spherical plain bearing cannot be adjusted.
[0004] To achieve the above object, the utility model is realized by the following technical solutions:
[0005] A spherical plain bearing includes a mutually adapted inner ring and an outer ring. An annular limiting groove is formed on the outer spherical surface of the inner ring. A limiting member is movably arranged on the outer ring and is used to cooperate with the annular limiting groove of the inner ring to adjust the number of rotational degrees of freedom of the inner ring relative to the outer ring. The limiting member is configured to be able to switch and adjust between a first state position where it is inserted into the annular limiting groove and a second state position where it exits the annular limiting groove. The number of rotational degrees of freedom of the inner ring relative to the outer ring is adjusted by the limiting member being inserted into the annular limiting groove to form a limiting fit.
[0006] Furthermore, at least a part of the limiting member inserted into the annular limiting groove is in a cylindrical structure, and the central axis A of the cylindrical structure part of the limiting member is configured to pass through the center of the outer spherical surface of the outer ring and be perpendicular to the central axis B of the outer spherical surface of the outer ring. When the limiting member is adjusted to the first state position relative to the outer ring and is adaptively inserted into the annular limiting groove of the inner ring, the inner ring can only rotate relative to the outer ring around the central axis A of the cylindrical structure part of the limiting member and rotate around the central axis B of the outer spherical surface of the outer ring under the limiting fit between the limiting member and the annular limiting groove.
[0007] Further, a radial through-hole is provided at the peripheral surface of the outer ring. The limiting member is movably embedded in the through-hole, and a communication hole communicating with the through-hole is provided at the end surface of the outer ring. A positioning pin is installed in the communication hole. The limiting member is formed with a first limiting portion and a second limiting portion for limiting cooperation with the positioning pin. When the positioning pin forms a limiting cooperation with the first limiting portion of the limiting member, the limiting member is positioned relative to the outer ring at the first state position where it is snapped into the annular limiting groove. When the positioning pin forms a limiting cooperation with the second limiting portion of the limiting member, the limiting member is positioned relative to the outer ring at the second state position where it exits the annular limiting groove.
[0008] Further, a positioning groove is provided at the peripheral surface of the limiting member. The positioning groove forms a second limiting portion for limiting cooperation with the positioning pin to position the limiting member at the second state position. The outer end surface of the limiting member forms a first limiting portion for limiting cooperation with the positioning pin to position the limiting member at the first state position.
[0009] Further, the positioning pin includes a connecting section matched with the communication hole and a positioning head provided at the head of the connecting section for limiting cooperation with the first limiting portion or the second limiting portion of the limiting member.
[0010] Further, the communication hole is a threaded hole structure, and the connecting section is a stud structure. The connecting section is screwed and matched with the communication hole.
[0011] Further, two limiting members are provided on the outer ring, and the two limiting members are arranged in a centrally symmetric manner on the outer ring.
[0012] Further, the positioning groove is an annular groove structure, and the annular limiting groove is provided at the equator line position of the outer spherical surface of the inner ring.
[0013] Further, an inclined surface for ejecting the limiting member is provided in the annular limiting groove. The highest side of the inclined surface extends to the surface of the outer spherical surface of the inner ring, and the lowest side of the inclined surface extends to the bottom surface of the annular limiting groove.
[0014] Further, two relatively arranged inclined surfaces are provided in the annular limiting groove, and the highest sides of the two inclined surfaces are connected together.
[0015] The above technical solutions have the following advantages or beneficial effects:
[0016] In the spherical plain bearing of the present utility model, when the limiting member is adjusted and positioned to the first state position where it is snapped into the annular limiting groove, the limiting fit formed by the limiting member being snapped into the annular limiting groove correspondingly restricts and adjusts the rotational freedom degree of the inner ring relative to the outer ring. When the limiting member is adjusted and positioned to the second state position where it exits the annular limiting groove, the spherical plain bearing can rotate or swing around different axes like a common spherical plain bearing. Thus, the spherical plain bearing can achieve a good effect of flexibly adjusting the rotational freedom degree to better adapt to different working conditions. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] Figure 1 FIG. is a three-dimensional structural schematic diagram of the spherical plain bearing according to an embodiment of the present utility model.
[0018] Figure 2 FIG. is a three-dimensional structural exploded schematic diagram of the spherical plain bearing according to an embodiment of the present utility model.
[0019] Figure 3 FIG. is a structural cross-sectional view of the limiting member relative to the outer ring in the first state position according to an embodiment of the present utility model.
[0020] Figure 4 FIG. is a structural cross-sectional view of the limiting member relative to the outer ring in the second state position according to an embodiment of the present utility model.
[0021] Reference Signs Explanation:
[0022] 1, inner ring; 2, outer ring; 3, limiting member; 4, positioning pin; 11, annular limiting groove; 12, inclined surface; 21, through hole; 22, communication hole; 31, positioning groove; 32, outer end face; 41, connecting section; 42, positioning head. DETAILED DESCRIPTION OF THE EMBODIMENTS
[0023] The present utility model will be further described below in conjunction with the drawings and embodiments.
[0024] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present utility model.
[0025] Please refer to the attached Figure 1 to the attached Figure 4, an embodiment of the present utility model provides a spherical plain bearing, which includes an inner ring 1 and an outer ring 2 that are mutually adapted. An annular limiting groove 11 is formed on the outer spherical surface of the inner ring 1. A limiting member 3 is movably arranged on the outer ring 2 and is configured to cooperate with the annular limiting groove 11 of the inner ring 1 to adjust the number of rotational degrees of freedom of the inner ring 1 relative to the outer ring 2. The limiting member 3 is configured to be able to switch and adjust between a first state position where it is inserted into the annular limiting groove 11 and a second state position where it exits the annular limiting groove 11 relative to the outer ring 2. By the limiting member 3 being inserted into the annular limiting groove 11 to form a limiting fit, the number of rotational degrees of freedom of the inner ring 1 relative to the outer ring 2 is adjusted. It can be understood that in this embodiment, when the limiting member 3 is adjusted and positioned to the first state position where it is inserted into the annular limiting groove 11, the limiting fit formed by the limiting member 3 being inserted into the annular limiting groove 11 performs corresponding limiting adjustment on the number of rotational degrees of freedom of the inner ring 1 relative to the outer ring 2. When the limiting member 3 is adjusted and positioned to the second state position where it exits the annular limiting groove 11, the spherical plain bearing can rotate or swing around different axes like a common spherical plain bearing. In this way, the spherical plain bearing can produce a good effect of flexibly adjusting the number of rotational degrees of freedom to better adapt to different working conditions.
[0026] Please refer to the attached Figure 1 to the attached Figure 4 , in one preferred embodiment, at least a part of the limiting member 3 that is inserted into the annular limiting groove 11 has a cylindrical structure. Preferably, in this embodiment, the limiting member 3 has an overall cylindrical structure, and the central axis A of the cylindrical structure part of the limiting member 3 is configured to pass through the center of the inner spherical surface of the outer ring 2 and be perpendicular to the central axis B of the inner spherical surface of the outer ring 2. When the limiting member 3 is adjusted relative to the outer ring 2 to the first state position and is adaptively inserted into the annular limiting groove 11 of the inner ring 1, the inner ring 1 can only rotate relative to the outer ring 2 around the central axis A of the cylindrical structure part of the limiting member 3 and rotate around the central axis B of the inner spherical surface of the outer ring 2 under the limiting fit between the limiting member 3 and the annular limiting groove 11. That is, through the limiting fit between the limiting member 3 and the annular limiting groove 11 of the inner ring 1, the inner ring 1 can only perform axial rotational movement around the central axis B of the inner spherical surface of the outer ring 2 and the central axis A of the cylindrical structure part of the limiting member 3 that is perpendicular to the central axis B of the inner spherical surface of the outer ring 2, and the number of rotational degrees of freedom of the joint bearing is adjusted to two.
[0027] Please refer to the attached Figure 1 to the attached Figure 4, in a preferred embodiment, a radial through hole 21 is provided on the circumferential surface of the outer ring 2, the limiting member 3 is movably embedded in the through hole 21, and a communication hole 22 communicating with the through hole 21 is provided at the end surface of the outer ring 2. A positioning pin 4 is installed in the communication hole 22. The limiting member 3 is formed with a first limiting portion and a second limiting portion for limiting cooperation with the positioning pin 4. When the positioning pin 4 forms a limiting cooperation with the first limiting portion of the limiting member 3, the limiting member 3 is positioned relative to the outer ring 2 at the first state position where it is snapped into the annular limiting groove 11. When the positioning pin 4 forms a limiting cooperation with the second limiting portion of the limiting member 3, the limiting member 3 is positioned relative to the outer ring 2 at the second state position where it exits the annular limiting groove 11. Preferably, a positioning groove 31 is provided on the circumferential surface of the limiting member 3, and the positioning groove 31 forms a second limiting portion for limiting cooperation with the positioning pin 4 to position the limiting member 3 at the second state position. In a preferred embodiment, the outer end surface 32 of the limiting member 3 forms a first limiting portion for limiting cooperation with the positioning pin 4 to position the limiting member 3 at the first state position. However, those skilled in the art should understand that in other embodiments, two positioning groove structures corresponding to the first state position and the second state position can also be provided on the circumferential surface of the limiting member 3, and the limiting member 3 is positioned at the first state position or the second state position through the limiting cooperation of the corresponding positioning groove structures of the limiting member 3.
[0028] Please refer to the attached Figure 1 to the attached Figure 4 , in a preferred embodiment, the positioning pin 4 includes a connecting section 41 that cooperates with the communication hole 22 and a positioning head 42 provided at the head of the connecting section 41 for limiting cooperation with the first limiting portion or the second limiting portion of the limiting member 3. Preferably, the communication hole 22 is a screw hole structure, the connecting section 41 is a stud structure, and the connecting section 41 is screwed and fitted with the communication hole 22. The positioning groove 31 is an annular groove structure, and the annular limiting groove 11 is provided at the equator line position of the outer spherical surface of the inner ring 1. In addition, those skilled in the art should understand that in other embodiments, two limiting members 3 can also be provided on the outer ring 2, and the two limiting members 3 are arranged in a centrosymmetric manner on the outer ring 2 and correspond to the annular limiting groove 11.
[0029] Please refer to the attached Figure 1 , in a preferred embodiment, an inclined surface 12 for ejecting the limiting member 3 is provided in the annular limiting groove 11. The highest side of the inclined surface 12 extends to the surface of the outer spherical surface of the inner ring 1, and the lowest side of the inclined surface 12 extends to the bottom surface of the annular limiting groove 11. Further, two relatively arranged inclined surfaces 12 are provided in the annular limiting groove 11, and the highest sides of the two inclined surfaces 12 are connected together. In this way, no matter whether the inner ring 1 is rotated forward or backward to the highest position of the inclined surface 12, the limiting member 3 snapped into the annular limiting groove 11 can be ejected, thereby eliminating the limiting effect of the limiting member 3 on the rotational freedom of the inner ring.
[0030] As described above, the embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features; and these modifications or replacements do not cause the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention. Therefore, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.
Claims
1. A radial spherical plain bearing, comprising an inner ring (1) and an outer ring (2) adapted to each other, characterized in that: An annular limiting groove (11) is provided on the outer spherical surface of the inner ring (1), and a limiting member (3) is movably provided on the outer ring (2) for cooperating with the annular limiting groove (11) of the inner ring (1) to adjust the number of rotational freedoms of the inner ring (1) relative to the outer ring (2).
2. The radial spherical plain bearing according to claim 1, characterized in that: The limiting member (3) is configured to be switchable and adjustable relative to the outer ring (2) between a first state position in which the limiting member is engaged with the annular limiting groove (11) and a second state position in which the limiting member is withdrawn from the annular limiting groove (11). The limiting member (3) is engaged with the annular limiting groove (11) to form a limiting fit, thereby adjusting the number of rotational degrees of freedom of the inner ring (1) relative to the outer ring (2).
3. The radial spherical plain bearing according to claim 2, characterized in that: The limiting member (3) is cylindrical in structure at least in the portion that is inserted into the annular limiting groove (11), and the center axis A of the cylindrical structure portion of the limiting member (3) is configured to pass through the center of the inner spherical surface of the outer ring (2) and be perpendicular to the center axis B of the inner spherical surface of the outer ring (2), so that when the limiting member (3) is adjusted to a first state position relative to the outer ring (2) and is adaptively inserted into the annular limiting groove (11) of the inner ring (1), the inner ring (1) can only rotate relative to the outer ring (2) around the center axis A of the cylindrical structure portion of the limiting member (3) and around the center axis B of the inner spherical surface of the outer ring (2) under the limiting cooperation between the limiting member (3) and the annular limiting groove (11).
4. The radial spherical plain bearing according to claim 2, characterized in that: A radial through hole (21) is provided on the circumferential surface of the outer ring (2), the limiting member (3) is movably embedded in the through hole (21), and a connecting hole (22) connected to the through hole (21) is provided on the end surface of the outer ring (2), a positioning pin (4) is installed in the connecting hole (22), and a first limiting portion and a second limiting portion are formed on the limiting member (3) for limiting cooperation with the positioning pin (4), so that when the positioning pin (4) forms a limiting cooperation with the first limiting portion of the limiting member (3), the limiting member (3) is positioned relative to the outer ring (2) in a first state position where it is inserted into the annular limiting groove (11), and when the positioning pin (4) forms a limiting cooperation with the second limiting portion of the limiting member (3), the limiting member (3) is positioned relative to the outer ring (2) in a second state position where it is withdrawn from the annular limiting groove (11).
5. The radial spherical plain bearing according to claim 4, characterized in that: A positioning groove (31) is provided on the circumferential surface of the limiting member (3), the positioning groove (31) forming a second limiting portion for limiting cooperation with the positioning pin (4) to position the limiting member (3) in the second state position, and an outer end surface (32) of the limiting member (3) forming a first limiting portion for limiting cooperation with the positioning pin (4) to position the limiting member (3) in the first state position.
6. The radial spherical plain bearing according to claim 5, characterized in that: The positioning pin (4) comprises a connecting section (41) matched with the connecting hole (22) and a positioning head (42) provided at the head of the connecting section (41) for performing limiting matching with the first limiting part or the second limiting part of the limiting member (3).
7. The radial spherical plain bearing according to claim 6, characterized in that: The communicating hole (22) is a screw hole structure, the connecting section (41) is a stud structure, and the connecting section (41) and the communicating hole (22) are screwed together.
8. The radial spherical plain bearing according to claim 1, characterized in that: Two limiting members (3) are provided on the outer ring (2), and the two limiting members (3) are arranged in a centrally symmetrical manner on the outer ring (2).
9. The radial spherical plain bearing according to any one of claims 1 to 8, characterized in that: An inclined surface (12) for ejecting the limiting member (3) is provided in the annular limiting groove (11), the highest side of the inclined surface (12) extending to the outer spherical surface of the inner ring (1), and the lowest side of the inclined surface (12) extending to the bottom surface of the annular limiting groove (11).
10. The radial spherical plain bearing according to claim 9, characterized in that: Two oppositely arranged inclined surfaces (12) are provided in the annular limiting groove (11), and the highest sides of the two inclined surfaces (12) are connected together.