Negative clearance hub bearing unit detection tool

Abstract

The utility model discloses a negative clearance hub bearing unit detection tool, and belongs to the technical field of automobiles. The problems that in the prior art, when negative clearance detection is carried out on a negative clearance hub bearing unit, detection is troublesome, and errors are large are solved. The device mainly comprises a supporting frame and a half shaft, the supporting frame comprises a base, vertical beams are installed on the two sides of the base respectively, a U-shaped rotating frame is rotationally installed between the vertical beams on the two sides, the rotating frame comprises a bottom plate, cantilevers are installed at the two ends of the bottom plate respectively, and the cantilevers on the two sides are fixedly connected with rotating shafts respectively and rotationally connected with the vertical beams on the two sides through the rotating shafts respectively. A half shaft installation hole is formed in the middle of the bottom plate, the half shaft comprises a shaft rod, an upper thread head is installed on the top of the shaft rod, an upper nut is installed on the upper thread head, a support is installed on the top face of the upper nut, and a dial indicator is installed on the support.

Description

Technical Field

[0001] This utility model belongs to the field of automotive technology, and more specifically, it relates to a testing fixture for a negative clearance hub bearing unit. Background Technology

[0002] Bearing clearance is the gap between the rolling elements and the inner and outer rings of the bearing after it is installed on the shaft and bore. Based on the direction of movement, it can be divided into radial clearance and axial clearance. The axial and radial clearances of a bearing are related; in actual production, axial clearance is easier to measure, and radial clearance is usually controlled indirectly by controlling axial clearance. Commercial vehicle wheel bearing units commonly fall into two main categories: positive clearance wheel bearing units and negative clearance wheel bearing units. Positive clearance wheel bearing units can have their clearance measured using a tilting test bench and a dial indicator. However, for negative clearance wheel bearing units, current production methods mostly rely on measuring the wheel hub's starting rotation force to indirectly estimate the approximate range of negative clearance. This measurement method is not only cumbersome but also prone to large measurement errors. Summary of the Invention

[0003] The purpose of this invention is to provide a testing fixture for negative clearance hub bearing units, so as to overcome the problems of troublesome testing and large errors in the prior art when testing negative clearance hub bearing units.

[0004] This utility model is achieved using the following technical solution: a negative clearance hub bearing unit testing fixture, comprising a support frame and a half-shaft. The support frame includes a base, with vertical beams mounted on both sides of the base. A U-shaped rotating frame is rotatably mounted between the two vertical beams. The rotating frame includes a base plate, with cantilever arms mounted at both ends of the base plate. The two cantilever arms are respectively fixedly connected to rotating shafts and rotatably connected to the two vertical beams via the rotating shafts. A motor is connected to the rotating shaft of one cantilever arm. A half-shaft mounting hole is provided in the middle of the base plate. The half-shaft includes a shaft rod, with an upper threaded head mounted on the top of the shaft rod. An upper nut is mounted on the upper threaded head, and a bracket is mounted on the top surface of the upper nut. A dial indicator is mounted on the bracket. A mounting seat is mounted on the bottom of the shaft rod, with a lower threaded head mounted on the bottom of the mounting seat. The lower threaded head passes through the half-shaft mounting hole and is fitted with a lower nut.

[0005] Furthermore, the motor is a stepper motor, and the motor is fixedly mounted on the support frame.

[0006] Furthermore, the bottom of the mounting base is provided with a boss, and the threaded head is installed on the bottom of the boss.

[0007] Furthermore, the top surface of the upper nut is provided with a fixing threaded hole, the bracket includes an upper horizontal plate and a lower horizontal plate, the lower horizontal plate is provided with a fixing hole, a fixing bolt is inserted between the fixing threaded hole and the fixing hole, the upper horizontal plate is connected to the lower horizontal plate through a vertical plate, the top surface of the upper horizontal plate is provided with a dial indicator mounting hole, one end of the upper horizontal plate is provided with a fastening threaded hole communicating with the dial indicator mounting hole, a fastening bolt is inserted into the fastening threaded hole, the dial indicator includes a housing and a measuring rod, the bottom of the housing is connected to a sleeve, the measuring rod passes through the sleeve, the sleeve passes through the dial indicator mounting hole, and one end of the fastening bolt abuts against the sleeve.

[0008] Furthermore, the top surface of the upper nut is provided with three fixed threaded holes along the circumferential direction, and the bracket is connected to one of the fixed threaded holes through the lower horizontal plate.

[0009] Furthermore, the inner side of the vertical beam is equipped with stops on both sides of the same-side pivot, and the outer side of the cantilever is equipped with a limiting rod, which is inserted between the two stops.

[0010] Furthermore, at least one side of the cantilever has an inner positioning hole on the lower side of the pivot shaft, and the vertical beam on the side of the cantilever with the inner positioning hole has outer positioning holes on the upper and lower sides of the pivot shaft respectively, which cooperate with the inner positioning hole. A positioning pin can be inserted between the inner positioning hole and the outer positioning hole.

[0011] Compared with the prior art, the beneficial effects of this utility model are:

[0012] This invention makes it more convenient to inspect negative clearance hub bearings, and eliminates the need for indirect measurement, resulting in more accurate measurements. During inspection, the negative clearance hub bearing is first fixed to a rotating frame, and a dial indicator is fixed to the upper nut via a bracket. Then, the minimum clearance value of the negative clearance hub bearing when it is upright is measured using the dial indicator's measuring rod. Next, the rotating frame is rotated 180 degrees using a motor, causing the negative clearance hub bearing to rotate 180 degrees, changing it from an upright to an inverted position. At this point, the maximum clearance value of the negative clearance hub bearing is measured using the dial indicator's measuring rod. Finally, the difference between the minimum and maximum clearance values ​​is obtained; this difference is the negative clearance value. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of this utility model;

[0014] Figure 2 yes Figure 1 A magnified view of a section at point I;

[0015] Figure 3 This is a schematic diagram of the structure of the rotating frame after it has been rotated 180 degrees according to this utility model;

[0016] Figure 4This is a diagram showing the usage state of this utility model.

[0017] In the diagram: 1. Support frame; 2. Base; 3. Vertical beam; 4. Rotating frame; 5. Base plate; 6. Cantilever; 7. Rotating shaft; 8. Motor; 9. Shaft; 10. Upper threaded head; 11. Upper nut; 12. Bracket; 13. Dial indicator; 14. Lower threaded head; 15. Lower nut; 16. Boss; 17. Fixed threaded hole; 18. Upper horizontal plate; 19. Lower horizontal plate; 20. Fixing bolt; 21. Dial indicator mounting hole; 22. Fastening bolt; 23. Indicator case; 24. Measuring rod; 25. Sleeve; 26. Stop; 27. Limiting rod; 28. Inner positioning hole; 29. ​​Outer positioning hole; 30. Positioning pin; 31. Mounting base; 32. Vertical plate. Detailed Implementation

[0018] To enable those skilled in the art to better understand the technical solutions of this utility model, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort should fall within the scope of protection of this utility model.

[0019] A negative clearance hub bearing unit testing fixture includes a support frame 1 and a half shaft. The support frame 1 includes a base 2, which is I-shaped. Vertical beams 3 are installed on both sides of the base 2, and a rotation space for a rotating frame 4 is formed between the two vertical beams 3. A U-shaped rotating frame 4 is rotatably installed between the two vertical beams 3. The rotating frame 4 includes a base plate 5, and cantilever arms 6 are installed at both ends of the base plate 5. The two cantilever arms 6 are fixedly connected to rotating shafts 7 and rotatably connected to the two vertical beams 3 through the rotating shafts 7. A motor 8 is connected to the rotating shaft 7 of one cantilever arm 6.

[0020] In this invention, bearing seats are installed on the upper sides of the vertical beams 3 on both sides, and bearings are installed inside the bearing seats. A rotating shaft 7 is rotatably installed inside the bearings. A motor 8 is installed on the outer side of one of the vertical beams 3. The motor 8 is self-locking and is a stepper motor. The motor 8 can drive the rotating frame 4 to rotate 180 degrees forward or backward. The motor 8 is connected to the rotating shaft 7 on this side of the vertical beam 3. In application, the motor 8 drives the rotating shaft 7 on the same side to rotate. Since the rotating shaft 7 on this side is fixedly connected to the cantilever 6 on the rotating frame 4 on the same side, the rotating shaft 7 will drive the rotating frame 4 to rotate.

[0021] The base plate 5 has a half-shaft mounting hole in the middle. The half-shaft includes a shaft 9. An upper threaded head 10 is installed on the top of the shaft 9, and an upper nut 11 is installed on the upper threaded head 10. A mounting seat 31 is installed on the bottom of the shaft 9, and a lower threaded head 14 is installed on the bottom of the mounting seat 31. The lower threaded head 14 passes through the half-shaft mounting hole and is fitted with a lower nut 15. The bottom of the mounting seat 31 has a boss 16, and the lower threaded head 14 is installed on the bottom of the boss 16.

[0022] The outer diameters of the mounting base 31 and the boss 16 described in this utility model are both larger than the inner diameter of the half-shaft mounting hole.

[0023] When installing the half-shaft, the lower threaded head 14 of the half-shaft is first passed through the half-shaft mounting hole, and then the lower nut 15 is tightened on the lower threaded head 14 to fix the half-shaft on the base plate 5 of the rotating frame 4.

[0024] In this invention, when installing the wheel hub bearing, the shaft 9 is first passed through the wheel hub bearing, then the wheel hub bearing is placed on the mounting base 31, and finally the upper nut 11 is tightened on the upper thread head 10, thereby fixing the wheel hub bearing between the mounting base 31 and the upper nut 11.

[0025] A bracket 12 is mounted on the top surface of the upper nut 11. The bracket 12 includes an upper horizontal plate 18 and a lower horizontal plate 19. A fixing hole is provided on the lower horizontal plate 19. The upper horizontal plate 18 is connected to the lower horizontal plate 19 through a vertical plate 32. A dial indicator mounting hole 21 is provided on the top surface of the upper horizontal plate 18. A fastening threaded hole communicating with the dial indicator mounting hole 21 is provided at one end of the upper horizontal plate 18. A fastening bolt 22 is inserted into the fastening threaded hole.

[0026] The top surface of the upper nut 11 has a fixing threaded hole 17, and a fixing bolt 20 is inserted between the fixing threaded hole 17 and the fixing hole. The top surface of the upper nut 11 has three fixing threaded holes 17 along the circumferential direction, and the bracket 12 is connected to one of the fixing threaded holes 17 through the lower horizontal plate 19.

[0027] In this utility model, when it is necessary to fix the bracket 12, the fixing hole on the lower horizontal plate 19 is first aligned with a fixing threaded hole 17 on the upper nut 11, and then the fixing bolt 20 is screwed into the fixing hole and the fixing threaded hole 17, so that the bracket 12 is fixedly installed on the upper nut 11.

[0028] A dial indicator 13 is mounted on the bracket 12. The dial indicator 13 includes a housing 23 and a measuring rod 24. The bottom of the housing 23 is connected to a sleeve 25. The measuring rod 24 passes through the sleeve 25. The sleeve 25 passes through the dial indicator mounting hole 21, and one end of the fastening bolt 22 abuts against the sleeve 25.

[0029] In this utility model, when it is necessary to fix the dial indicator 13, first insert the sleeve 25 of the dial indicator 13 into the dial indicator mounting hole 21 of the upper horizontal plate 18, then screw the fastening bolt 22 into the fastening thread hole, and make one end of the fastening bolt 22 tightly abut against the sleeve 25, thereby fixing the dial indicator 13 on the bracket 12.

[0030] The inner side of the vertical beam 3 is equipped with stop blocks 26 on both sides of the same side rotating shaft 7, and the outer side of the cantilever 6 is equipped with a limiting rod 27, which is inserted between the two stop blocks 26.

[0031] This invention, by installing stop blocks 26 on both sides, can assist in limiting the rotation of the rotating frame 4. When the rotating frame 4 is upright, the limiting rod 27 on the cantilever 6 will contact one of the stop blocks 26. When the rotating frame 4 is driven by the motor 8 to rotate 180 degrees and is inverted, the limiting rod 27 on the cantilever 6 will contact the other stop block 26. The limiting rod 27 is a round rod.

[0032] At least one side of the cantilever 6 has an inner positioning hole 28 on the lower side of the pivot 7. The vertical beam 3 on the side of the cantilever 6 with the inner positioning hole 28 has an outer positioning hole 29 on the upper and lower sides of the pivot 7 respectively, which mates with the inner positioning hole 28. A positioning pin 30 can be inserted between the inner positioning hole 28 and the outer positioning hole 29.

[0033] This invention utilizes an inner positioning hole 28 and two outer positioning holes 29 on both sides to position the rotating frame 4, resulting in more accurate measurements. When the rotating frame 4 is upright, the inner positioning hole 28 on the cantilever 6 aligns with the outer positioning hole 29 on the lower side of the vertical beam 3. At this time, a pin can be inserted into the inner positioning hole 28 and the lower outer positioning hole 29. When the rotating frame 4 is inverted, the inner positioning hole 28 on the cantilever 6 aligns with the outer positioning hole 29 on the upper side of the vertical beam 3. At this time, a pin can be inserted into the inner positioning hole 28 and the upper outer positioning hole 29. In this invention, the outer positioning hole 29 can be provided only on the side of the vertical beam 3 where the motor 8 is not installed, and the inner positioning hole 28 can be provided only on the side of the cantilever 6 where the motor 8 is not connected.

[0034] The working process of this utility model is as follows: First, install the hub bearing. During installation, first pass the shaft 9 through the hub bearing, then place the hub bearing on the mounting base 31, and tighten the upper nut 11 onto the upper thread head 10. Then, fix the dial indicator 13 to the upper nut 11 through the bracket 12. Then, measure the minimum clearance value of the negative clearance hub bearing when it is upright using the measuring rod 24 of the dial indicator 13. Then, use the motor 8 to rotate the rotating frame 4 180 degrees, thereby rotating the negative clearance hub bearing 180 degrees, so that the negative clearance hub bearing changes from the upright state to the inverted state. At this time, measure the maximum clearance value of the negative clearance hub bearing using the measuring rod 24 of the dial indicator 13. Finally, obtain the difference between the minimum clearance value and the maximum clearance value. This difference is the value of the negative clearance.

Claims

1. A testing fixture for a negative clearance hub bearing unit, characterized in that, Includes a support frame (1) and a half-shaft. The support frame (1) includes a base (2). Vertical beams (3) are installed on both sides of the base (2). A U-shaped rotating frame (4) is rotatably installed between the two vertical beams (3). The rotating frame (4) includes a base plate (5). Cantilever arms (6) are installed at both ends of the base plate (5). The two cantilever arms (6) are fixedly connected to rotating shafts (7) and rotatably connected to the two vertical beams (3) through the rotating shafts (7). The rotating shaft (7) of one cantilever arm (6) is connected to a motor (8). The base plate ( 5) has a half-shaft mounting hole in the middle. The half-shaft includes a shaft (9). An upper thread head (10) is installed on the top of the shaft (9). An upper nut (11) is installed on the upper thread head (10). A bracket (12) is installed on the top surface of the upper nut (11). A dial indicator (13) is installed on the bracket (12). A mounting seat (31) is installed at the bottom of the shaft (9). A lower thread head (14) is installed at the bottom of the mounting seat (31). The lower thread head (14) passes through the half-shaft mounting hole and a lower nut (15) is installed.

2. The negative clearance hub bearing unit testing fixture according to claim 1, characterized in that, The motor (8) is a stepper motor, and the motor (8) is fixedly mounted on the support frame (1).

3. The negative clearance hub bearing unit testing fixture according to claim 1, characterized in that, The mounting base (31) has a boss (16) at its bottom, and the threaded head (14) is installed at the bottom of the boss (16).

4. The negative clearance hub bearing unit testing fixture according to claim 1, characterized in that, The upper nut (11) has a fixed threaded hole (17) on its top surface. The bracket (12) includes an upper horizontal plate (18) and a lower horizontal plate (19). A fixed hole is provided on the lower horizontal plate (19). A fixing bolt (20) is inserted between the fixed threaded hole (17) and the fixed hole. The upper horizontal plate (18) is connected to the lower horizontal plate (19) through a vertical plate (32). A dial indicator mounting hole (21) is provided on the top surface of the upper horizontal plate (18). A fastening threaded hole is provided at one end of the upper horizontal plate (18) that connects to the dial indicator mounting hole (21). A fastening bolt (22) is inserted into the fastening threaded hole. The dial indicator (13) includes a case (23) and a measuring rod (24). A sleeve (25) is connected to the bottom of the case (23). The measuring rod (24) passes through the sleeve (25). The sleeve (25) passes through the dial indicator mounting hole (21), and one end of the fastening bolt (22) abuts against the sleeve (25).

5. The negative clearance hub bearing unit testing fixture according to claim 4, characterized in that, The top surface of the upper nut (11) has three fixed threaded holes (17) along the circumferential direction, and the bracket (12) is connected to one of the fixed threaded holes (17) through the lower horizontal plate (19).

6. The negative clearance hub bearing unit testing fixture according to claim 1, characterized in that, The inner side of the vertical beam (3) is equipped with stop blocks (26) on both sides of the same side pivot (7), and the outer side of the cantilever (6) is equipped with a limiting rod (27), which is inserted between the two stop blocks (26).

7. The negative clearance hub bearing unit testing fixture according to claim 1, characterized in that, At least one of the cantilever (6) has an inner positioning hole (28) on the lower side of the pivot (7). The vertical beam (3) on the side of the cantilever (6) with the inner positioning hole (28) has an outer positioning hole (29) on the upper and lower sides of the pivot (7) respectively, which cooperates with the inner positioning hole (28). A positioning pin (30) can be inserted between the inner positioning hole (28) and the outer positioning hole (29).

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