A tooling for detecting axial clearance of crossed roller bearings

Abstract

This utility model relates to a tooling for detecting the axial clearance of crossed roller bearings in the field of bearing testing technology. It includes: a base; a mandrel, the lower end of which is detachably coaxially mounted on the top surface of the base, the top of the mandrel having a necked-down positioning section for radial positioning of the inner ring of the bearing under test, and the bottom of the necked-down positioning section having a positioning step surface for axial positioning of the inner ring of the bearing under test; a locking bolt, screwed into a threaded hole in the middle of the upper end face of the necked-down positioning section, for pressing against the upper end face of the inner ring of the bearing under test; and a cover ring, coaxially fastened to the upper end of the outer ring of the bearing under test. This utility model uses the necked-down positioning section at the upper end of the mandrel and the positioning step surface at the bottom to initially position the inner ring of the bearing, and then uses the tapered surface of the locking bolt to drive the upper end of the mandrel to expand radially, ultimately achieving an interference fit with the inner hole of the bearing inner ring, ensuring that the inner ring of the bearing is firmly and coaxially fixed during the testing process.

Description

Technical Field

[0001] This utility model relates to the field of bearing testing technology, and in particular to a tooling for testing the axial clearance of crossed roller bearings. Background Technology

[0002] Crossed roller bearings are a type of compact precision bearing that can simultaneously withstand radial loads, axial loads, and overturning moments. They are widely used in fields with extremely high requirements for rotational accuracy and rigidity, such as industrial robots, precision machine tools, and medical equipment.

[0003] Axial clearance is a key performance indicator of crossed roller bearings, directly affecting their operating accuracy, rigidity, vibration, and service life. Therefore, it is crucial to quickly and accurately detect axial clearance during bearing assembly at the factory and during equipment maintenance.

[0004] Traditional methods for measuring the axial clearance of crossed roller bearings often involve manual measurement using general-purpose measuring tools (such as dial indicators and gauge blocks). During operation, the bearing inner ring is typically fixed, and then an axial force is manually applied to the outer ring in the vertical direction. The difference between the maximum and minimum displacements is then read as the clearance value using an instrument. However, this traditional method lacks specialized and stable clamping fixtures. The inner ring is often not securely fixed or experiences slight movement during measurement, and the direction of the applied force on the outer ring is prone to deviation, resulting in poor repeatability and large errors in the measurement results.

[0005] To address this, we designed a tooling for detecting the axial clearance of crossed roller bearings. Utility Model Content

[0006] To overcome the shortcomings of the prior art, this utility model discloses a tooling for detecting the axial clearance of crossed roller bearings.

[0007] To achieve the above objectives, the present invention adopts the following technical solution: A fixture for detecting the axial clearance of crossed roller bearings, comprising: Base; The mandrel has its lower end detachably coaxially mounted to the top surface of the base. The top of the mandrel is provided with a necked positioning section for radial positioning of the inner ring of the bearing to be tested. The bottom of the necked positioning section is provided with a positioning step surface for axial positioning of the inner ring of the bearing to be tested. A locking bolt is screwed into a threaded hole in the middle of the upper end face of the necked positioning section, and is used to press against the upper end face of the inner ring of the bearing to be tested. The cover ring is coaxially fastened to the upper end of the outer ring of the bearing to be tested.

[0008] Furthermore, the base has a through positioning cone hole in the middle; The bottom of the mandrel has a tapered mating section, which is inserted into the positioning tapered hole and locked by a screw.

[0009] Furthermore, a tapered hole is provided in the middle of the upper end face of the mandrel, and the bottom of the tapered hole is coaxially connected with the threaded hole; The upper end of the mandrel is provided with multiple axial slots evenly distributed around its circumference. The locking bolt has a tapered section for pressing the tapered hole, causing the upper end of the mandrel to expand radially.

[0010] Furthermore, the locking bolt is sequentially fitted with an elastic element and a pressure plate, the pressure plate being used to press against the upper end face of the inner ring of the bearing to be tested.

[0011] Furthermore, the base is provided with at least two radial grooves evenly spaced along the circumference, and each radial groove is slidably connected to a slider. The top surface of the slider is provided with a lifting cylinder for lifting the outer ring of the bearing to be tested.

[0012] Furthermore, the radial groove is coaxially rotatably connected to an adjusting screw, which is threadedly engaged with the slider to adjust the radial position of the slider.

[0013] Furthermore, the lower end of the inner cavity of the cover ring is provided with an enlarged diameter section, which matches the upper end of the outer ring of the bearing to be tested.

[0014] Compared with the prior art, the beneficial effects of this utility model are: 1. The bearing inner ring is initially positioned by the necked positioning section at the upper end of the mandrel and the positioning step at the bottom. Then, the upper end of the mandrel is radially expanded by the conical surface of the locking bolt, which finally achieves an interference fit with the inner hole of the bearing inner ring. This ensures that the bearing inner ring is firmly and coaxially fixed during the inspection process, eliminating measurement errors caused by loose or eccentric inner rings, and greatly improving the accuracy and repeatability of axial clearance detection. 2. The entire clamping process requires only three main steps: placing the bearing, tightening the locking bolts, and fastening the cover ring. No complex tools or tedious adjustments are needed. The mandrel and base are positioned via a tapered fit, ensuring quick installation and excellent alignment. Compared to traditional methods, this significantly improves testing efficiency and reduces the workload for operators. 3. By incorporating a radially sliding slider and a lifting cylinder, it can accommodate bearing outer rings of different outer diameters. Rotating the adjusting screw precisely adjusts the radial position of the lifting point, ensuring that the lifting force always acts at the appropriate position on the outer ring. This design is suitable for inspecting various specifications of crossed roller bearings, reducing tooling purchase and management costs. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a schematic diagram of the exploded structure of this utility model; Figure 3 This is an exploded structural diagram of the present invention from another perspective; Figure 4 This is a cross-sectional view of the present invention.

[0016] In the diagram: 1. Base; 11. Positioning conical hole; 12. Radial groove; 2. Mandrel; 21. Necked positioning section; 22. Positioning step surface; 23. Threaded hole; 24. Tapered mating section; 25. Tapered hole; 26. Axial slot; 3. Locking bolt; 31. Tapered section; 4. Cover ring; 41. Expanded diameter section; 5. Screw; 6. Elastic element; 7. Pressure plate; 8. Slider; 9. Lifting cylinder; 10. Adjusting screw. Detailed Implementation

[0017] The present invention will be explained in detail through the following embodiments. The purpose of disclosing the present invention is to protect all technical improvements within the scope of the present invention. In the description of the present invention, it should be understood that if terms such as "upper", "lower", "front", "rear", "left", "right" indicate orientation or positional relationship, they are only corresponding to the drawings of this application for the convenience of describing the present invention. It should be understood that if terms such as "end", "side", "end portion", "side part", "lateral", "longitudinal", etc. indicate orientation or positional relationship, they are only corresponding to the length and width of the corresponding component. That is, "end" indicates the head and tail area in the length direction of the corresponding component, and "side part" indicates the head and tail area in the width direction of the corresponding component. They are used for the convenience of describing the present invention and do not indicate or imply that the device or element referred to must have a specific orientation.

[0018] Example 1, in conjunction with Appendix Figure 1-4 A tooling for detecting axial clearance of crossed roller bearings includes a base 1, a spindle 2, a locking bolt 3, and a cover ring 4.

[0019] The base 1 serves as the fundamental support component of the entire tooling and is preferably a disc-shaped structure, providing good stability. The base 1 has a through-hole positioning cone 11 in the center and is surrounded by a supporting structure.

[0020] The mandrel 2 is used to install and position the inner ring of the bearing under test. Its lower end has a tapered mating section 24. By inserting this tapered mating section 24 into the positioning tapered hole 11 of the base 1, quick and precise coaxial positioning of the mandrel 2 and the base 1 can be achieved. Subsequently, the mandrel 2 is securely fixed to the base 1 by tightening with screws 5. Specifically, the head of the screw 5 fits tightly against the base 1.

[0021] The top of the mandrel 2 is designed with a necked positioning section 21, the diameter of which is slightly smaller than the inner diameter of the inner ring of the bearing to be tested, so as to facilitate the fitting of the inner ring of the bearing. At the bottom of the necked positioning section 21, there is a radially protruding positioning step surface 22, which is used to support the lower end face of the inner ring of the bearing, thereby achieving axial positioning of it.

[0022] A tapered hole 25 is also provided in the middle of the upper end face of the mandrel 2. The bottom of the tapered hole 25 is coaxially connected to an axial threaded hole 23. A plurality of axial slots 26 are uniformly machined around the upper end of the mandrel 2, which divide the upper end of the mandrel 2 into a plurality of elastic petal-shaped structures.

[0023] The locking bolt 3 is used to tighten the inner ring of the bearing. Its screw section is screwed into the threaded hole 23 at the upper end of the mandrel 2. A tapered section 31 is provided below the head of the locking bolt 3. When the locking bolt 3 is tightened, its tapered section 31 will penetrate into and press the tapered hole 25 at the upper end of the mandrel 2, forcing the petal-shaped structure separated by the axial slot 26 to elastically expand outward, thereby tightly gripping the inner wall of the bearing inner ring, achieving the final positioning and locking of the inner ring.

[0024] Furthermore, an elastic element 6 (such as a disc spring or compression spring) and a pressure plate 7 can be sequentially fitted onto the screw of the locking bolt 3. When the locking bolt 3 is tightened, the pressure plate 7 applies force evenly to the upper end face of the bearing inner ring.

[0025] The lower end of the inner cavity of the cover ring 4 is provided with an expanded diameter section 41. The shape and size of the expanded diameter section 41 match the upper end of the outer ring of the bearing to be tested, so that the cover ring 4 can be accurately coaxially fastened to the outer ring of the bearing.

[0026] In use, fit the inner ring of the bearing to be tested onto the necked positioning section 21 of the mandrel 2, ensuring its lower end face rests on the positioning step surface 22. Then tighten the locking bolt 3; its tapered section 31 expands the upper end of the mandrel 2, locking the inner ring's inner hole. Simultaneously, the pressure plate 7 presses down on the upper end face of the inner ring, completely fixing it in place. Attach the cover ring 4 to the upper end of the bearing's outer ring. Use a dial indicator or micrometer, with its probe perpendicular to the upper end face of the cover ring 4. Then, manually lift the outer ring of the bearing to be tested and observe the pointer change on the instrument; the difference between the maximum and minimum readings is the axial clearance value of the bearing.

[0027] Example 2, in conjunction with Appendix Figure 1-4 A cross roller bearing axial clearance detection fixture differs from Embodiment 1 in that at least two radial grooves 12 are evenly spaced along the circumference of the base 1. In this embodiment, two radial grooves 12 are used.

[0028] Each radial groove 12 has a sliding block 8. A lifting cylinder 9 is mounted on the top surface of the sliding block 8. The piston rod of the lifting cylinder 9 extends upward to replace manual lifting of the outer ring of the bearing under test.

[0029] For further optimization, an adjusting screw 10 can be coaxially rotatably connected in the radial groove 12. The adjusting screw 10 is threadedly engaged with the slider 8. By rotating the adjusting screw 10, the slider 8 can be driven to slide along the radial groove 12, thereby adjusting the radial position of the lifting cylinder 9 to accommodate bearings of different sizes.

[0030] Furthermore, the outer end of the adjusting screw 10 is provided with a rotating handle.

[0031] The parts of this utility model not described in detail are prior art. It is obvious to those skilled in the art that this utility model is not limited to the details of the above exemplary embodiments, and that this utility model can be implemented in other specific forms without departing from the spirit or basic characteristics of this utility model. Therefore, the above embodiments should be regarded as exemplary and non-limiting in all respects. The scope of this utility model is defined by the appended claims rather than the foregoing description. Therefore, it is intended to include all changes that fall within the meaning and scope of the equivalents of the claims in this utility model, and no reference numerals in the claims should be regarded as limiting the content of the claims.

Claims

1. A cross-roller bearing axial play detection tool, characterized by, include: Base (1); The mandrel (2) is detachably coaxially mounted on the top surface of the base (1). The top of the mandrel (2) is provided with a necked positioning section (21) for radial positioning of the inner ring of the bearing to be tested. The bottom of the necked positioning section (21) is provided with a positioning step surface (22) for axial positioning of the inner ring of the bearing to be tested. Locking bolt (3) is screwed into the threaded hole (23) in the middle of the upper end face of the necked positioning section (21) and is used to press the upper end face of the inner ring of the bearing to be tested. The cover ring (4) is coaxially fastened to the upper end of the outer ring of the bearing to be tested.

2. The cross-roller bearing axial play detection tool of claim 1, wherein: The base (1) has a through positioning cone hole (11) in the middle. The bottom of the mandrel (2) has a tapered mating section (24), which is inserted into the positioning tapered hole (11) and locked by a screw (5).

3. The cross-roller bearing axial play detection tool of claim 1, wherein: The mandrel (2) has a tapered hole (25) in the middle of its upper end face, and the bottom of the tapered hole (25) is coaxially connected with the threaded hole (23); The upper end of the mandrel (2) is provided with multiple axial slots (26) evenly arranged in a circumferential direction. The locking bolt (3) has a tapered section (31) for pressing the tapered hole (25) to radially expand the upper end of the mandrel (2).

4. The cross-roller bearing axial play detection fixture of claim 1, wherein: The locking bolt (3) is fitted with an elastic element (6) and a pressure plate (7) in sequence. The pressure plate (7) is used to press the upper end face of the inner ring of the bearing to be tested.

5. An axial play detection tool for crossed roller bearings according to claim 1, characterized in that: The base (1) is provided with at least two radial grooves (12) evenly spaced along the circumference. Each radial groove (12) is slidably connected to a slider (8). The top surface of the slider (8) is provided with a lifting cylinder (9) for lifting the outer ring of the bearing to be tested.

6. An axial play detection tool for crossed-roller bearings according to claim 5, characterized in that: The radial groove (12) is coaxially rotatably connected to an adjusting screw (10), which is threadedly engaged with the slider (8) to adjust the radial position of the slider (8).

7. An axial play detection tool for cross-roller bearings according to claim 1, characterized in that: The lower end of the inner cavity of the cover ring (4) is provided with an enlarged diameter section (41), which matches the upper end of the outer ring of the bearing to be tested.

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