A precision bearing seat assembly for an industrial robot joint

Abstract

The present application relates to the technical field of bearing, especially to a precision bearing seat assembly for industrial robot joint, comprising a first seat body, a second seat body, a spring sleeve and a bearing piece, the second seat body is coaxially connected to the first seat body, the first seat body and the second seat body are provided with tapered holes in the shaft holes, the outer peripheral wall of the spring sleeve is provided with tapered portions at both ends, the bearing piece is arranged in the shaft hole of the spring sleeve and is clamped by the spring sleeve, at least one set of clamping adjusting structure is arranged between the first seat body and the second seat body, which is used for adjusting the clamping force of the spring sleeve on the bearing piece, the spring sleeve is driven to shrink radially by the relative rotation of the two seat bodies, the bearing is pre-clamped, the clamping force can be adjusted by the clamping adjusting structure, the bearing can be disassembled and assembled without special tools, and the assembly and maintenance are convenient, which can adapt to the load and precision requirements under different working conditions.

Description

Technical Field

[0001] This invention relates to the field of bearing technology, and in particular to a precision bearing housing assembly for industrial robot joints. Background Technology

[0002] In the joint structure of industrial robots, the assembly structure of bearings and bearing housings is a key component affecting the joint's operational accuracy, load-bearing reliability, and maintenance efficiency. Currently, bearings in industrial robot joints are generally fixed to the bearing housing using an interference fit. This assembly method has two significant limitations: First, the installation and removal of bearings require specialized pressing and pulling fixtures, resulting in cumbersome procedures, low efficiency, and difficulties in later equipment maintenance and bearing replacement. Second, the clamping force of the interference fit is directly determined by the machining tolerances of the parts. After assembly, the clamping force between the bearing and bearing housing cannot be flexibly adjusted according to the actual load and precision requirements of the operating conditions, making it difficult to adapt to the needs of different application scenarios and lacking flexibility. Summary of the Invention

[0003] The purpose of this invention is to overcome the aforementioned shortcomings and provide a precision bearing housing assembly for industrial robot joints. To achieve the above objective, the specific solution of this invention is as follows: A precision bearing housing assembly for an industrial robot joint includes a first housing, a second housing, a spring sleeve, and a bearing component. The second housing is coaxially rotatably connected to the first housing. Both the shaft holes of the second housing and the first housing are provided with tapered holes. The outer peripheral wall of the spring sleeve has tapered portions at both ends that are adapted to the tapered holes. The bearing component is disposed in the shaft hole of the spring sleeve and is held tightly by the spring sleeve. At least one set of clamping adjustment structures is provided between the second seat and the first seat, and the clamping adjustment structures are configured to adjust the clamping force of the spring clip on the bearing component.

[0004] Furthermore, the clamping adjustment structure of each group includes an adjustment groove provided on the second seat, a spiral ramp provided in the adjustment groove, a spiral hole provided through the spiral ramp, a wedge-shaped platform provided on the first seat, a threaded hole provided through the wedge-shaped platform, an elastic bolt provided through the spiral hole and threadedly connected to the threaded hole, and a pad provided on the outer peripheral wall of the elastic bolt and in contact with the spiral surface of the spiral ramp. The spiral hole extends along the spiral trajectory of the spiral surface of the spiral ramp, the top surface of the pad is an inclined support surface, and there is an angle between the support surface and the end cap face of the elastic bolt.

[0005] Furthermore, the present invention includes a stop boss inside the threaded hole; the end of the shank of the elastic bolt is provided with a threaded portion for threaded connection to the threaded hole and a stop step for cooperating with the stop boss.

[0006] Furthermore, the end cap of the elastic bolt is provided with an internal hexagonal groove.

[0007] Furthermore, the present invention provides two sets of clamping adjustment structures, and the two sets of clamping adjustment structures are symmetrical about the axis of the second seat or the first seat.

[0008] Furthermore, in this invention, the outer peripheral wall of the second seat is provided with grooves and ridges evenly distributed along the circumference, and the grooves and ridges are alternately distributed in sequence.

[0009] Furthermore, the first base body has mounting holes evenly distributed along its circumference.

[0010] Furthermore, the present invention provides multiple first elastic claws and multiple second elastic claws distributed circumferentially at both the upper and lower ends of the spring clip, wherein the number of second elastic claws is less than the number of first elastic claws, the thickness of the second elastic claws is less than the thickness of the first elastic claws, and the multiple second elastic claws are equally spaced circumferentially; the second elastic claws at the upper end of the spring clip are staggered from the second elastic claws at the lower end. The outer wall of the second elastic claw is provided with protrusions, and the end of the second elastic claw is provided with a pressure claw.

[0011] Furthermore, the inner wall of the spring clip is provided with a limiting step.

[0012] The beneficial effects of this invention are as follows: This invention utilizes the coaxial rotational cooperation of the first and second seats, combined with the adaptive structure of the tapered holes within the shaft holes of the two seats and the inclined surfaces of the tapered portions at both ends of the spring clip, to drive the spring clip to generate radial contraction deformation through the relative rotation of the two seats, thereby achieving pre-clamping of the bearing component. Simultaneously, by setting a clamping adjustment structure between the first and second seats, the radial clamping force of the spring clip can be controlled, allowing the bonding force between the bearing component and the bearing housing to be flexibly adjusted according to actual working conditions. This eliminates the need for specialized tools to install and disassemble the bearing component, effectively improving the convenience of bearing assembly and maintenance, and enhancing the adaptability of the bearing housing assembly to different loads and precision requirements. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of the precision bearing housing assembly of the present invention; Figure 2 This is a cross-sectional schematic diagram of the precision bearing housing assembly of the present invention; Figure 3 This is an exploded view of the precision bearing housing assembly of the present invention; Figure 4 This is a schematic diagram of the structure of the first base body of the present invention; Figure 5This is a schematic diagram of the structure of the second body of the present invention; Figure 6 This is a schematic diagram of the structure of the spring clip of the present invention; Figure 7 This is a schematic diagram of the structure of the elastic bolt and the pad of the present invention; Explanation of reference numerals in the attached drawings: 1. First seat; 11. Mounting hole; 2. Second seat; 21. Groove; 22. Raised bar; 3. Spring sleeve; 31. First elastic claw; 32. Second elastic claw; 33. Protrusion; 34. Pressing claw; 35. Limiting step; 4. Bearing component; 51. Adjusting groove; 52. Spiral ramp; 53. Spiral hole; 54. Wedge platform; 55. Threaded hole; 551. Stop boss; 56. Elastic bolt; 561. Threaded part; 562. Stop step; 563. Internal hexagonal groove; 57. Pad; 571. Support surface. Detailed Implementation

[0014] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments, but this is not to limit the scope of the invention to this.

[0015] like Figures 1 to 7 As shown, this embodiment of a precision bearing housing assembly is applied to the joint of an industrial robot. The precision bearing housing assembly includes a first housing 1, a second housing 2, a spring sleeve 3, and a bearing component 4. The second housing 2 is coaxially rotatably connected to the first housing 1, and the second housing 2 is threadedly connected to the first housing 1. Both the shaft hole of the second housing 2 and the shaft hole of the first housing 1 are provided with tapered holes. Both ends of the outer peripheral wall of the spring sleeve 3 are tapered portions adapted to the tapered holes. The bearing component 4 is disposed in the shaft hole of the spring sleeve 3 and is held tightly by the spring sleeve 3. The number of bearing components 4 can be two, and the two bearing components 4 are distributed at intervals along the axial direction of the first housing 1 or the second housing 2. At least one set of clamping adjustment structure is provided between the second seat 2 and the first seat 1. The clamping adjustment structure is configured to adjust the clamping force of the spring sleeve 3 on the bearing component 4.

[0016] Specifically, in this embodiment, during the assembly of the precision bearing housing assembly, the second housing 2 is threaded onto the first housing 1, the bearing 4 is placed inside the spring sleeve 3, and then the second housing 2 is rotated to cause axial displacement of the second housing 2 relative to the first housing 1. At this time, the walls of the tapered holes in the first housing 1 and the second housing 2 exert radial pressure on the tapered portion on the outer peripheral wall of the spring sleeve 3, so that the spring sleeve 3 pre-clamps the bearing 4. Then, the clamping adjustment structure further clamps the bearing 4 through the spring sleeve 3 until the required clamping force is reached, thereby completing the assembly of the housing and the bearing 4. When disassembly is required, the spring clip 3 is released from its grip on the bearing component 4 by adjusting the clamping structure, and the second seat 2 is rotated in the opposite direction to release the radial pressure of the tapered part on the tapered part by the wall of the tapered hole, thereby releasing the grip on the bearing component 4. At this time, the bearing component 4 can be removed.

[0017] In this embodiment, the bearing component 4 is clamped by the spring clip 3, and the clamping force of the spring clip 3 is adjusted by the clamping adjustment structure. This allows the clamping force of the seat on the bearing to be adjusted as needed. During disassembly, the bearing component 4 can be released simply by using the clamping adjustment structure and rotating the second seat 2, making the disassembly and assembly of the bearing component 4 more convenient and eliminating the need for special tools.

[0018] In some embodiments, such as Figures 1 to 7 As shown, each set of clamping adjustment structures includes an adjustment groove 51 set on the second base 2, a spiral ramp 52 set in the adjustment groove 51, a spiral hole 53 passing through the spiral ramp 52, a wedge-shaped platform 54 set on the first base 1, a threaded hole 55 passing through the wedge-shaped platform 54, an elastic bolt 56 passing through the spiral hole 53 and threadedly connected to the threaded hole 55, and a pad 57 sleeved on the outer peripheral wall of the elastic bolt 56 and in contact with the spiral surface of the spiral ramp 52. The spiral hole 53 extends along the spiral trajectory of the spiral surface of the spiral ramp 52, and the top surface of the pad 57 is an inclined support surface 571. There is an angle between the support surface 571 and the end cap face of the elastic bolt 56.

[0019] Specifically, during assembly, by rotating the second seat 2, the elastic bolt 56 moves relative to the spiral hole 53, and the bottom surface of the pad 57 abuts against the spiral surface of the spiral ramp 52. The second seat 2 and the first seat 1 move axially, causing the spring clip 3 to pre-clamp the bearing 4. Then, by rotating the elastic bolt 56, the elastic bolt 56 moves axially along the threaded hole 55. The end cap of the elastic bolt 56 presses against the pad 57. At this time, with the cooperation of the spiral surface of the spiral ramp 52 and the pad 57, the elastic bolt 56 generates a rotational torque on the second seat 2, causing the second seat 2 to continue to move axially. This causes the spring clip 3 to further contract radially, further clamping the bearing 4. Thus, by causing the second seat 2 to move axially at different strokes, the spring clip 3 generates different clamping forces. Therefore, the elastic bolt 56 can be moved axially at different strokes according to actual needs to generate different clamping forces on the bearing 4. When the elastic bolt 56 can no longer move axially along the threaded hole 55 after further tightening, the elastic bolt 56 will bend elastically due to the angle between the support surface 571 of the pad 57 and the end cap face of the elastic bolt 56 until the end cap face of the elastic bolt 56 is in complete contact with the support surface 571 of the pad 57. At this time, the clamping force of the spring clip 3 on the bearing 4 reaches its maximum. At the same time, the elastic deformation force generated by the elastic bolt 56 acts on the second seat 2, making the second seat 2 maintain the tightening tendency, thereby producing an elastic anti-loosening effect. This prevents the threaded connection between the second seat 2 and the first seat 1 from loosening, which would reduce the clamping force of the spring clip 3. At the same time, the elastic deformation force generated by the elastic bolt 56 acts on the threaded hole 55, increasing the normal pressure between the threaded part 561 and the threaded hole 55, which can also prevent the elastic bolt 56 itself from loosening.

[0020] During disassembly, the elastic bolt 56 is turned in the opposite direction to release the rotational torque applied to the second seat 2, causing the spring sleeve 3 to gradually loosen the bearing 4. Then, the second seat 2 is rotated in the opposite direction to completely loosen the bearing 4, thus allowing the bearing 4 to be disassembled from the seat. This process is convenient for disassembly and assembly.

[0021] In some embodiments, such as Figure 4 and Figure 7 As shown, a stop boss 551 is located inside the threaded hole 55; the end of the shank of the elastic bolt 56 is provided with a threaded portion 561 for threaded connection with the threaded hole 55 and a stop step 562 for engaging with the stop boss 551. Specifically, during assembly, when the elastic bolt 56 is screwed on, the threaded portion 561 engages with the threaded hole 55, causing the elastic bolt 56 to move axially along the axis of the threaded hole 55. When the end face of the stop step 562 of the elastic bolt 56 contacts and abuts against the end face of the stop boss 551, the stop boss 551 restricts the elastic bolt 56 from continuing to move axially, that is, restricts the axial movement stroke of the elastic bolt 56. At this time, as the elastic bolt 56 is further screwed on, the elastic bolt 56 will bend elastically because it cannot continue to move axially, thereby locking the second seat 2 and keeping the spring sleeve 3 tightly clamping the bearing 4.

[0022] In some embodiments, such as Figure 1 and Figure 7 As shown, the end cap of the elastic bolt 56 is provided with an internal hexagonal groove 563; with this design, the elastic bolt 56 can be tightened using a common hexagonal wrench without the need for special tools, making disassembly and assembly more convenient.

[0023] In some embodiments, such as Figure 1 , Figures 3 to 5As shown, the clamping adjustment structure is provided in two sets, and the two sets of clamping adjustment structures are symmetrical about the axis of the second seat 2 or the first seat 1. Through the above arrangement, the second seat 2 is subjected to more balanced forces, and the squeezing force of the second seat 2 on the spring clip 3 is more balanced, thereby making the clamping of the bearing component 4 by the spring clip 3 more reliable and stable.

[0024] In some embodiments, such as Figure 1 and Figure 5 As shown, the outer peripheral wall of the second seat 2 is evenly distributed with grooves 21 and ridges 22 along the circumference, and the grooves 21 and ridges 22 are alternately distributed. This embodiment, through the above-mentioned design, achieves an anti-slip effect and facilitates more stable screwing operations on the second seat 2.

[0025] In some embodiments, such as Figures 1 to 4 As shown, the first base 1 has mounting holes 11 evenly distributed around its circumference. The number of mounting holes 11 is set according to the actual installation environment, so that the first base 1 can be fixedly installed on the external robot joint through the mounting holes 11.

[0026] In some embodiments, such as Figure 2 , Figure 3 and Figure 6 As shown, the upper and lower ends of the spring clip 3 are provided with a plurality of first elastic claws 31 and a plurality of second elastic claws 32 distributed circumferentially. The number of second elastic claws 32 is less than the number of first elastic claws 31. For example, the number of second elastic claws 32 at each end of the spring clip 3 is three. The thickness of the second elastic claws 32 is less than the thickness of the first elastic claws 31, so that the second elastic claws 32 are easier to deform. The plurality of second elastic claws 32 are evenly distributed circumferentially. The second elastic claws 32 at the upper end of the spring clip 3 are staggered from the second elastic claws 32 at the lower end, so that the axial limit of the bearing component 4 is more reliable. The outer wall of the second elastic claw 32 is provided with a protrusion 33, and the end of the second elastic claw 32 is provided with a pressure claw 34, so that the pressure claw 34 contacts the end face of the bearing component 4, thereby restricting the axial movement of the bearing component 4.

[0027] Specifically, during assembly, the second base 2 is rotated, and the wall of the tapered hole first contacts the protrusion 33 on the outer wall of each second elastic claw 32, thereby squeezing each second elastic claw 32, causing each second elastic claw 32 to undergo radial deformation, so that the pressure claw 34 of each second elastic claw 32 abuts against the end face of the bearing component 4, thereby axially limiting the bearing component 4, until the wall of the tapered hole squeezes and contacts each first elastic claw 31, and each first elastic claw 31 and each second elastic claw 32 clamps and holds the bearing component 4 tightly.

[0028] In some embodiments, such as Figure 2 and Figure 6As shown, the inner wall of the spring clip 3 is provided with a limiting step 35. In this embodiment, by providing the limiting step 35, when the bearing 4 is placed in the spring clip 3, one end face of the bearing 4 contacts and abuts against the limiting step 35. When the second seat 2 is rotated, the pressure claws 34 on each of the second elastic claws 32 contact and abut against the other end face of the bearing 4, thereby providing a more reliable axial limit for the bearing 4 and effectively preventing the bearing 4 from axially moving during the clamping process.

[0029] The above description is only a preferred embodiment of the present invention. Therefore, all equivalent changes or modifications made to the structure, features and principles described in the claims of this patent application are included within the protection scope of this patent application.

Claims

1. A precision bearing housing assembly for an industrial robot joint, characterized in that, It includes a first base, a second base, a spring sleeve, and a bearing component. The second base is coaxially rotatably connected to the first base. Both the shaft holes of the second base and the first base are provided with tapered holes. Both ends of the outer peripheral wall of the spring sleeve are tapered portions adapted to the tapered holes. The bearing component is located in the shaft hole of the spring sleeve and is held tightly by the spring sleeve. At least one set of clamping adjustment structures is provided between the second seat and the first seat, and the clamping adjustment structures are configured to adjust the clamping force of the spring clip on the bearing component.

2. The precision bearing housing assembly according to claim 1, characterized in that, Each group of clamping adjustment structures includes an adjustment groove on the second seat, a spiral ramp in the adjustment groove, a spiral hole through the spiral ramp, a wedge-shaped platform on the first seat, a threaded hole through the wedge-shaped platform, an elastic bolt through the spiral hole and threadedly connected to the threaded hole, and a pad sleeved on the outer peripheral wall of the elastic bolt and in contact with the spiral surface of the spiral ramp. The spiral hole extends along the spiral trajectory of the spiral surface of the spiral ramp, the top surface of the pad is an inclined support surface, and there is an angle between the support surface and the end cap face of the elastic bolt.

3. The precision bearing housing assembly according to claim 2, characterized in that, The threaded hole has an inner stop boss; the end of the shank of the elastic bolt is provided with a threaded portion for threaded connection to the threaded hole and a stop step for cooperating with the stop boss.

4. The precision bearing housing assembly according to claim 2, characterized in that, The end cap of the elastic bolt is provided with an internal hexagonal groove.

5. The precision bearing housing assembly according to any one of claims 2 to 4, characterized in that, The clamping adjustment structure is provided in two sets, and the two sets of clamping adjustment structures are symmetrical about the axis of the second seat or the first seat.

6. The precision bearing housing assembly according to claim 1, characterized in that, The outer peripheral wall of the second seat is evenly distributed with grooves and ridges along the circumference, and the grooves and ridges are alternately distributed in sequence.

7. The precision bearing housing assembly according to claim 1, characterized in that, The first base has mounting holes evenly distributed along its circumference.

8. The precision bearing housing assembly according to claim 1, characterized in that, The upper and lower ends of the spring clip are provided with a plurality of first elastic claws and a plurality of second elastic claws distributed circumferentially. The number of second elastic claws is less than the number of first elastic claws, and the thickness of the second elastic claws is less than the thickness of the first elastic claws. The plurality of second elastic claws are distributed at equal intervals circumferentially. The second elastic claws at the upper end of the spring clip are staggered from the second elastic claws at the lower end. The outer wall of the second elastic claw is provided with protrusions, and the end of the second elastic claw is provided with a pressure claw.

9. The precision bearing housing assembly according to claim 1, characterized in that, The inner wall of the spring clip is provided with a limit step.

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