Industrial robot slewing bearing

Abstract

The invention discloses an industrial robot slewing bearing, which belongs to the technical field of slewing bearings, comprises an inner ring, an outer ring and a retainer, and has stronger supporting and self-locking functions. And the outer surface of the inner ring is provided with an outer middle ring surface and two outer side ring surfaces, so that radial and axial forces borne by the bearing in the working process can be effectively decomposed. The outer ring is sleeved outside the inner ring, and the outer ring and the inner ring keep coaxial through the inner ring surface and the outer ring surface which are in a non-contact state. The retainer is installed in an installation gap between the inner side ring face and the outer side ring face, and a plurality of rolling bodies are rotationally installed in the retainer to provide stable supporting. And the outer ring adopts a split structure design and comprises a main body and a locking ring, so that the inner ring and the outer ring are conveniently combined and mounted. And the locking ring is mounted in the annular groove in the main body through a plurality of bolts, so that the inner ring is effectively locked. The slewing bearing has the advantages of being stable in supporting, easy and convenient to install, reliable in self-locking and the like.

Description

Technical Field

[0001] The present invention relates to the technical field of slewing bearings, and in particular to a slewing bearing for an industrial robot. Background Art

[0002] During the installation process of industrial robots, the slewing bearing is an important component. The slewing bearing includes an outer ring, an inner ring, and a ball connected between the outer ring and the inner ring. After installation, the outer ring and the inner ring need to be measured for roundness and flatness, as well as the installation accuracy between the outer ring and the inner ring. That is, the roundness and flatness of the inner ring are measured with the outer ring as the reference, and the roundness and flatness of the outer ring are measured with the inner ring as the reference. The conventional measurement method is to install the slewing bearing on a measuring machine, and the measurement can be easily carried out by driving the slewing bearing to rotate. However, when facing some larger slewing bearings, due to the heavy weight of the slewing bearing to be measured, it is difficult to carry and the installation process is relatively complicated. A larger machine is also required, which consumes too much time and financial costs. Therefore, the present invention provides a slewing bearing measuring instrument that can solve the above problems. Summary of the Invention

[0003] In view of the above-mentioned technical deficiencies, the purpose of the present invention is to provide an industrial robot slewing bearing that can perform a self-locking function.

[0004] In order to solve the above technical problems, the present invention adopts the following technical solution: The present invention provides an industrial robot slewing bearing, comprising: An inner ring, wherein the outer surface of the inner ring is provided with an outer middle ring surface and two outer ring surfaces, the outer ring surfaces are conical surfaces forming an angle with the outer middle ring surface, and the outer ring surfaces are provided with an outer rolling ring; The outer ring is sleeved on the outside of the inner ring. The inner surface of the outer ring is provided with an inner middle ring surface and an inner ring surface. The inner ring surface is also conical and has the same taper as the outer ring surface. A mounting gap is provided between the outer and inner ring surfaces. The inner ring surface is provided with an inner rolling ring. A retainer is installed in the installation gap, and a plurality of rolling bodies are rotatably installed inside the retainer. The inner and outer sides of the rolling bodies are respectively rotatably installed inside the inner rolling ring and the outer rolling ring; The outer ring includes a main body and a locking ring. An annular groove adapted to the locking ring is provided on the side wall of the main body. The locking ring is installed inside the annular groove through a fastener. The two inner ring surfaces are respectively arranged on the main body and the locking ring.

[0005] Preferably, a mounting hole is provided in the middle of the inner ring, a center groove in the shape of a ring is provided in the middle of the inner middle ring surface, a plurality of sliding rods are radially slidably installed inside the inner ring, one end of the sliding rod extends into the middle mounting hole of the inner ring, and a rotating wheel is rotatably installed on the other end of the sliding rod, and the sliding rod includes at least a locking state, and the locking state is: the rotating wheel at the end of the sliding rod extends to the inside of the center groove.

[0006] Preferably, a plurality of sliding rods are evenly distributed in the inner ring in a circumferential direction, and the sliding rods are slidingly mounted in the inner ring via an elastic body.

[0007] Preferably, the annular surface of the rotating wheel is a conical surface, and the side wall of the center groove close to the locking ring is an annular conical surface. When the rotating wheel is arranged inside the center groove, a gap is left between the side wall of the center groove away from the locking ring and the rotating wheel.

[0008] Preferably, one end of the slide rod extending to the mounting hole inside the inner ring is spherical, and the mounting hole in the middle of the inner ring is provided with an inner groove corresponding to the slide rod one by one, and an arc plate is connected to the inner groove, and the arc plate bypasses the end of the slide rod.

[0009] Preferably, both sides of the inner groove are provided with extended grooves adapted to the ends of the arc-shaped plate, and both ends of the arc-shaped plate extend to the inside of the extended grooves on both sides respectively.

[0010] Preferably, each of the retaining frames comprises two rows of spherical grooves for mounting rolling elements.

[0011] Preferably, the locking ring is fixed to the main body by a plurality of bolts.

[0012] The beneficial effects of the present invention are: By designing the inner and outer rings and equipping them with multiple rolling elements, this slewing bearing can more effectively decompose and withstand radial and axial forces, providing strong support. The split outer ring design, through the cooperation of the locking ring and the annular groove, simplifies the assembly process of the inner and outer rings and improves installation efficiency.

[0013] The design of the slide rod and the runner enables the bearing to be automatically adjusted and locked during installation without the need for additional tools or steps; the slide rod and the runner design in the inner ring not only provide additional support, but also reduce the thrust of the locking ring when the bearing is subjected to axial force, preventing its deformation; the conical surface design of the runner cooperates with the annular conical surface of the center groove, ensuring that the slide rod can smoothly enter and lock in the center groove, enhancing the self-locking effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 Exploded view of the bearing.

[0015] Figure 2 This is a cross-sectional view of the bearing.

[0016] Figure 3 A three-dimensional diagram of a bearing.

[0017] Figure 4 This is a structural diagram of the inner circle.

[0018] Figure 5 Schematic diagram of the structure of the cage.

[0019] Figure 6 Schematic diagram of the structure of the outer ring.

[0020] In the figure: 1. inner ring, 101. outer middle ring surface, 102. outer ring surface, 2. outer ring, 201. inner middle ring surface, 202. inner ring surface, 203. main body, 204. locking ring, 205. center groove, 3. retaining frame, 4. rolling element, 5. elastomer, 6. slide rod, 7. runner, 8. inner groove, 9. arc plate, 10. extension groove. DETAILED DESCRIPTION

[0021] The present invention is described below with specific examples, but is not intended to be limiting of the invention.

[0022] Example 1 like Figures 1-6 As shown, in this embodiment, an industrial robot slewing bearing is provided, which includes an inner ring 1, an outer ring 2 and a retaining frame 3.

[0023] The outer surface of the inner ring 1 is equipped with an outer center ring surface 101 and two outer ring surfaces 102. The two side ring surfaces are located on either side of the center ring surface. The outer ring surface 102 is a tapered surface at an angle to the outer center ring surface 101. The inner ring 1 is designed as an annular structure with a larger diameter at the center than at the two sides. The axes of the outer center ring surface 101 and the two outer ring surfaces 102 (each forming a tapered surface) coincide. In this configuration, the tapered surfaces on both sides act as support surfaces. These tapered surfaces not only effectively reduce the radial forces acting on the bearing during operation, but also provide strong support when the bearing is subjected to axial forces. The outer ring surface 102 is provided with an outer rolling ring.

[0024] The outer ring 2 fits over the inner ring 1. Its inner surface is defined by an inner center annular surface 201 and an inner side annular surface 202. The inner center annular surface 201 corresponds one-to-one with the outer center annular surface 101, and the inner side annular surface 202 also corresponds one-to-one with the outer side annular surface 102. The inner side annular surface 202 is also tapered, with the same taper as the outer side annular surface 102. The inner center annular surface 201 and the outer center annular surface 101 maintain a non-contact state, thus eliminating friction. Furthermore, the axes of the inner center annular surface 201 and the inner side annular surface 202 completely coincide. When the outer ring 2 is mounted on the inner ring 1, the axes of the various components of the inner ring 1 and the outer ring 2 also coincide, ensuring the coaxiality of the entire structure. A mounting gap is provided between the outer side annular surface 102 and the inner side annular surface 202. The inner side annular surface 202 is provided with an inner rolling ring. This mounting gap provides space for the subsequent installation of the retainer 3.

[0025] The retainer 3 is installed in the installation gap, and multiple rolling bodies 4 are rotatably installed inside the retainer 3. The rolling bodies 4 are spheres, and the rolling bodies 4 are rollingly installed inside the retainer 3. The retainer 3 is a circular plate, and multiple spherical grooves adapted to the rolling bodies 4 are provided inside the retainer 3. The spherical grooves pass through the inner and outer side walls of the retainer 3. When the rolling bodies 4 are installed inside the spherical grooves, the rolling bodies 4 will extend out of the retainer 3. The inner and outer sides of the rolling bodies 4 are respectively rollingly installed inside the inner rolling ring and the outer rolling ring. The inner rolling ring and the outer rolling ring are respectively annular grooves opened on the inner annular surface 202 and the outer annular surface 102. The grooves are adapted to the rolling bodies 4, and the rolling bodies 4 can roll in the corresponding grooves.

[0026] The outer ring 2 comprises a main body 203 and a locking ring 204. The sidewall of the main body 203 is provided with an annular groove adapted to accommodate the locking ring 204. The locking ring 204 is mounted within the groove using multiple bolts. This design utilizes a split outer ring 2 primarily to facilitate the assembly of the inner ring 1 and outer ring 2. The annular groove on the outer ring 2 provides space for the inner ring 1, allowing it to slide easily into the outer ring 2. Subsequently, the locking ring 204 is secured within the groove, effectively locking the inner ring 1 within the outer ring 2. This installation method greatly simplifies the assembly of the inner and outer rings 1 and 2, allowing them to be quickly and securely joined. Two inner annular surfaces 202 are provided on the main body 203 and the locking ring 204, respectively. The inner annular surface 202 of the locking ring 204 supports and restrains the retainer 3, effectively preventing it from shifting within the installation gap and ensuring its stability.

[0027] Each cage 3 includes two rows of spherical grooves for mounting rolling elements 4. Both rows of spherical grooves are designed in an annular shape, and each spherical groove is equipped with a rolling element 4. This design enables the two rolling elements 4 to jointly provide a more stable and effective support.

[0028] Example 2 like Figures 1-6 As shown, based on the first embodiment, this embodiment provides a self-locking function for the inner ring 1 and the outer ring 2, as follows: A mounting hole is defined in the center of the inner ring 1. An annular center groove 205 is defined in the center of the inner center annular surface 201. Center groove 205 is embedded in the inner side of the main body 203. Multiple slide bars 6 are radially slidably mounted within the inner ring 1. One end of each slide bar 6 extends into the central mounting hole of the inner ring 1, and a rotating wheel 7 is rotatably mounted on the other end of each slide bar 6. The slide bars 6 can be in at least a locked state. In the locked state, the rotating wheel 7 at the end of each slide bar 6 extends into the center groove 205. When the rotating wheel 7 is in this state, it fits tightly against the sidewalls of the center groove 205. The rotational connection between the rotating wheel 7 and the slide bars 6 allows the rotating wheel 7 to roll freely within the center groove 205. When the rotating wheel 7 presses against the sidewalls of the center groove 205, the slide bars 6 generate a supporting force between the inner ring 1 and the main body 203. This supporting force helps reduce the interaction force between the inner ring 1 and the outer ring 2. When the bearing is subjected to axial force, the synergistic effect of the slide rod 6 and the runner 7 can reduce the thrust of the retaining frame 3 on the locking ring 204, thereby effectively preventing the locking ring 204 from being deformed.

[0029] Multiple sliding rods 6 are evenly distributed circumferentially in the inner ring 1. The sliding rods 6 are slidably installed in the inner ring 1 through the elastic body 5. Multiple sliding rods 6 provide more uniform and flexible supporting force. The sliding rods 6 can only slide axially in the inner ring 1.

[0030] Example 3 like Figures 1-6 As shown, based on the first and second embodiments, this embodiment provides the installation state of the bearing, which is as follows: The annular surface of the runner 7 is conical, and the sidewall of the center groove 205 near the locking ring 204 is an annular conical surface. The conical surface of the runner 7 is cleverly designed to mate with the annular conical surface on the sidewall of the center groove 205. This design ensures that when the slide rod 6 drives the runner 7 along its axial direction, the runner 7 can easily and unimpededly enter the center groove 205. Furthermore, under the action of the slide rod 6, the runner 7 eventually abuts against the annular conical surface. As the slide rod 6 moves, the runner 7 rolls smoothly on the annular conical surface, achieving stable and effective displacement control. When the runner 7 is positioned within the center groove 205, a gap is left between the sidewall of the center groove 205 away from the locking ring 204 and the runner 7. The contact point between the runner 7 and the sidewall of the center groove 205 is intentionally designed to be close to the locking ring 204. This is to ensure that the runner 7 serves as an effective support structure when circumferential stress is generated between the inner ring 1 and the outer ring 2. Through this design, the wheel 7 can share and reduce the thrust acting on the locking ring 204, thereby effectively protecting the locking ring 204 from excessive force impact and ensuring the stability of the entire self-locking bearing system.

[0031] The end of the slide rod 6 that extends into the mounting hole inside the inner ring 1 is spherical. The mounting hole in the middle of the inner ring 1 is equipped with an inner groove 8 that corresponds one-to-one with the slide rod 6. A curved plate 9 is connected to the inner groove 8 and wraps around the end of the slide rod 6. During the bearing installation process, the bearing must first be sleeved onto the shaft. During this sleeved installation, the shaft exerts a certain amount of pressure on the curved plate 9 inside the bearing. This pressure causes the curved plate 9 to deform, exerting a thrust on the slide rod 6. This push from the curved plate 9 allows the slide rod 6 to smoothly enter the inner ring 1 and effectively lock the outer ring 2, ensuring the stability of the bearing after installation.

[0032] Both sides of the inner groove 8 are provided with extended grooves 10 adapted to the ends of the curved plate 9. The ends of the curved plate 9 extend into the interior of the extended grooves 10 on both sides. When the curved plate 9 is subjected to pressure, it will fit toward the inner groove 8. During this process, the ends of the curved plate 9 will move to the sides as the fitting action occurs and eventually be hidden in the extended grooves 10.

[0033] Working principle: When the bearing is subjected to radial or axial forces, the rolling elements 4 roll in the inner and outer rolling rings, distributing the forces to the entire bearing structure, thereby providing stable support.

[0034] The number and distribution of the rolling elements 4 ensure that the bearing remains stable when subjected to heavy loads and running at high speeds.

[0035] During installation, the bearing is sleeved onto the shaft, which applies pressure to the curved plate 9, causing it to deform and push the slide bar 6 into the inner ring 1. Pushed by the curved plate 9, the slide bar 6 drives the runner 7 into the center groove 205 and fits tightly against the sidewalls of the center groove 205, achieving automatic locking.

[0036] Locking ring 204 is bolted into the annular groove, locking inner ring 1 within outer ring 2 and ensuring the coaxiality of the entire structure. When the bearing is subjected to axial force, the synergistic effect of slide rod 6 and runner 7 reduces the thrust of retainer 3 on locking ring 204, preventing deformation of locking ring 204. The conical surface design of runner 7 matches the annular conical surface of center groove 205, allowing slide rod 6 to smoothly enter and lock within center groove 205 while accommodating slight displacement between inner ring 1 and outer ring 2. The design of curved plate 9 and extended groove 10 allows the bearing to adapt to different shaft diameters and pressures during installation, ensuring stability and coaxiality after installation.

[0037] Finally, it should be noted that the above embodiments are only used to illustrate rather than limit the technical solutions of the present invention. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that the present invention can still be modified or replaced by equivalents. Any modification or partial replacement that does not depart from the spirit and scope of the present invention should be included in the scope of the claims of the present invention.

Claims

1. An industrial robot slewing bearing, characterized in that: include: An inner ring (1), wherein an outer middle ring surface (101) and two outer ring surfaces (102) are provided on the outer surface of the inner ring (1), wherein the outer ring surfaces (102) are conical surfaces that form an angle with the outer middle ring surface (101), and an outer rolling ring is provided on the outer ring surfaces (102); An outer ring (2), the outer ring (2) being sleeved on the outside of the inner ring (1), the inner surface of the outer ring (2) being provided with an inner middle ring surface (201) and an inner ring surface (202), the inner ring surface (202) also being a conical surface and having the same taper as the outer ring surface (102), a mounting gap being provided between the outer ring surface (102) and the inner ring surface (202), and an inner rolling ring being provided on the inner ring surface (202); A retainer (3), the retainer (3) being mounted in the mounting gap, a plurality of rolling bodies (4) being rotatably mounted inside the retainer (3), and inner and outer sides of the rolling bodies (4) being respectively rolling mounted inside the inner rolling ring and the outer rolling ring; The outer ring (2) comprises a main body (203) and a locking ring (204); an annular groove adapted to the locking ring (204) is provided on a side wall of the main body (203); the locking ring (204) is mounted inside the annular groove via a fastener; and the two inner annular surfaces (202) are respectively provided on the main body (203) and the locking ring (204).

2. The industrial robot slewing bearing according to claim 1, characterized in that: A mounting hole is provided in the middle of the inner ring (1), and a center groove (205) in the shape of a ring is provided in the middle of the inner middle ring surface (201). A plurality of slide rods (6) are radially slidably installed inside the inner ring (1), one end of the slide rod (6) extends into the middle mounting hole of the inner ring (1), and a rotating wheel (7) is rotatably installed on the other end of the slide rod (6). The slide rod (6) includes at least a locking state, and the locking state is: the rotating wheel (7) at the end of the slide rod (6) extends to the inside of the center groove (205).

3. The industrial robot slewing bearing according to claim 2, characterized in that: The plurality of sliding rods (6) are evenly distributed in the inner ring (1) in the circumferential direction, and the sliding rods (6) are slidably mounted in the inner ring (1) via the elastic body (5).

4. The industrial robot slewing bearing according to claim 2, characterized in that: The annular surface of the rotating wheel (7) is a conical surface, and the side wall of the central groove (205) close to the locking ring (204) is an annular conical surface. When the rotating wheel (7) is arranged inside the central groove (205), a gap is left between the side wall of the central groove (205) away from the locking ring (204) and the rotating wheel (7).

5. The industrial robot slewing bearing according to claim 2, characterized in that: One end of the slide rod (6) extending to the internal mounting hole of the inner ring (1) is spherical, and the mounting hole in the middle of the inner ring (1) is provided with an inner groove (8) corresponding to the slide rod (6) one by one, and an arc plate (9) is connected to the inner groove (8), and the arc plate (9) bypasses the end of the slide rod (6).

6. The industrial robot slewing bearing according to claim 5, characterized in that: Both sides of the inner groove (8) are provided with extended grooves (10) adapted to the ends of the arc-shaped plate (9), and both ends of the arc-shaped plate (9) extend to the interior of the extended grooves (10) on both sides respectively.

7. The industrial robot slewing bearing according to claim 1, characterized in that: Each retaining frame (3) comprises two rows of spherical grooves for mounting rolling bodies (4).

8. The industrial robot slewing bearing according to claim 1, characterized in that: The locking ring (204) is fixed to the main body (203) via a plurality of bolts.

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