High-precision grinding fixture for machining aluminum alloy hub bearing seat

Abstract

The utility model relates to the technical field of fixture, concretely relates to high accuracy grinding fixture for aluminium alloy wheel hub bearing seat processing, include: base, the edge fixedly connected with sliding frame in the edge of base upper end surface center position, the upper end surface fixedly connected with motor of sliding frame, the output fixedly connected with threaded rod of motor, the other end rotationally connected with the upper end surface of base of threaded rod. Through the concave seat, elastic air bag, support frame structure and contraction structure in bottom clamp subassembly, avoid the phenomenon that the bearing seat is in the concave seat and rolls disorderly, change the liquid amount in the concave seat, make support frame structure extension support bearing seat top, guide dispersion vibration energy, avoid bearing seat disorderly roll, form the double firm structure of bottom positioning, top support, reduce the influence of vibration on bearing seat grinding accuracy, effectively improve processing quality and production efficiency.

Description

Technical Field

[0001] This utility model relates to the field of fixture technology, specifically to a high-precision grinding fixture for machining aluminum alloy wheel hub bearing seats. Background Technology

[0002] A high-precision grinding fixture for machining aluminum alloy wheel hub bearing housings is a tooling device specifically designed to ensure the grinding accuracy of aluminum alloy wheel hub bearing housings. It uses high-precision positioning elements to closely fit the reference surface of the workpiece, and uses hydraulic or pneumatic clamping mechanisms to apply pressure evenly, thus firmly fixing the workpiece on the grinding machine table. It is also equipped with an adjustable support structure and error compensation device, which can effectively counteract the influence of vibration and cutting force during the grinding process. With the help of a high-precision guiding system and detection elements, the grinding position and dimensional tolerances can be precisely controlled, thereby ensuring the hole accuracy, surface roughness and relative position accuracy of each component of the bearing housing, meeting the high-precision assembly requirements of automobile wheel hubs, such as the bell-shaped shell internal groove grinding fixture disclosed in Chinese Patent Publication No. CN104369096A.

[0003] Existing high-precision grinding fixtures for machining aluminum alloy wheel hub bearing housings generate vibrations during the grinding process. This is because the grinding wheel and workpiece surface experience high-speed friction during grinding, and aluminum alloy, with its relatively low hardness, is prone to elastic deformation under cutting forces. Furthermore, factors such as the dynamic balance error of the grinding wheel and grinding parameters exacerbate the vibration. This vibration causes a series of problems, such as the appearance of chatter marks on the ground surface, affecting surface roughness and reducing the workpiece's appearance quality; it also makes it difficult to guarantee grinding dimensional accuracy, potentially causing critical dimensions such as hole positions and shaft diameters to exceed tolerance limits. Utility Model Content

[0004] In view of the above-mentioned shortcomings of the existing technology, the present invention provides a high-precision grinding fixture for machining aluminum alloy wheel hub bearing seats, which can effectively solve the problem of vibration generated during the grinding of aluminum alloy wheel hub bearing seats in the existing technology.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] This utility model provides a high-precision grinding fixture for machining aluminum alloy wheel hub bearing housings, including:

[0007] A base, on which a slide is fixedly connected to the edge of the center position of the upper end face of the base, a motor is fixedly connected to the upper end face of the slide, a threaded rod is fixedly connected to the output end of the motor, and the other end of the threaded rod is rotatably connected to the upper end face of the base.

[0008] Furthermore, a bottom clamp assembly is provided at the center of the upper end face of the base. The bottom clamp assembly includes a concave seat fixedly connected to the upper end face of the base, and a bearing seat is placed in the concave part of the concave seat.

[0009] Furthermore, partition plates are fixedly connected to both sides of the concave arc surface inside the concave seat. The partition plates form two liquid zones and one vacuum zone inside the concave seat, with the vacuum zone located between the two liquid zones. Vibration-absorbing plates are fixedly connected to the inner bottom of both liquid zones, and one liquid zone stores a non-Newtonian liquid. Multiple vibration-inducing plates are fixedly connected to the concave arc surface of the concave seat in a ring array. A compression structure is provided on the side of the partition plate away from the concave arc surface, and the compression structure is located within the liquid zone. The compression structure includes an elastic gas cover fixedly connected to the side of the partition plate, and a counter-pressure cover is fixedly connected to the other end of the elastic gas cover.

[0010] Furthermore, elastic airbags are fixedly connected to both sides of the concave seat, and the elastic airbags are in communication with the liquid area. The elastic airbags store non-Newtonian liquid, and a fixing plate is connected to the other side of the elastic airbag.

[0011] Furthermore, the base has a shrinking structure on its upper surface at the center of the concave seat. The shrinking structure includes a driver fixedly connected to the upper surface of the concave seat. Shrinking rods are fixedly connected to both sides of the driver, and the other side of the shrinking rods is fixedly connected to a fixing plate.

[0012] Furthermore, support frame structures are provided on both opposite sides of the upper surface of the concave seat, and the support frame structures correspond to the liquid area. The support frame structure includes two contraction tubes fixedly connected to the upper surface of the concave seat located in the liquid area, and each contraction tube stores a non-Newtonian liquid. The other end of each of the two contraction tubes is fixedly connected to a liquid bladder, which stores a gel-like liquid. The other end of the two liquid bladders is fixedly connected to a connecting plate, and the other side of the connecting plate contacts the bearing seat.

[0013] Furthermore, the slide is provided with a top clamp assembly inside, the top clamp assembly includes a slide plate slidably connected inside the slide, the side of the slide plate facing the threaded rod is threadedly connected to the rod body of the threaded rod, a pressure block is fixedly connected to the side of the slide plate facing the bearing seat, a top seat is fixedly connected to the other side of the slide plate, a top column is fixedly connected to the other side of the top seat, and a balance plate is fixedly connected to the other side of the top column.

[0014] Furthermore, support plates are fixedly connected to both opposite sides of the skateboard, and a counterweight is slidably connected to the center of the support plate. The side of the counterweight away from the bearing seat is fixedly connected to a rope balance plate.

[0015] Furthermore, a lifting counterweight structure is provided on the upper surface of the counterweight block and on both sides of the balance plate. The lifting counterweight structure includes a connecting rod fixedly connected to the upper surface of the counterweight block. Two counterweight balls are slidably connected to the rod body. A spring is fixedly connected between the two counterweight balls and the spring is sleeved on the rod body.

[0016] The technical solution provided by this utility model has the following advantages compared with the known prior art:

[0017] 1. By utilizing the concave seat, elastic airbag, support frame structure, and shrinking structure in the bottom clamp assembly, the bottom of the bearing housing is positioned and lifted, and vibrations generated during bearing housing grinding are guided and eliminated, thereby reducing the impact of vibration on the accuracy of the bearing housing during grinding. Specifically, the concave seat positions and lifts the bottom of the bearing housing, ensuring that vibration does not affect the accuracy of the bearing housing during grinding. The shrinking structure allows non-Newtonian fluid from the elastic airbag to enter the fluid zone within the concave seat, changing the amount of non-Newtonian fluid in the concave seat. This causes the support frame structure to extend and contact the top of the bearing housing, further guiding vibration and supporting the bearing housing to prevent it from rolling around within the concave seat. By changing the amount of fluid within the concave seat, the support frame structure extends to support the top of the bearing housing, both guiding and dispersing vibration energy and preventing the bearing housing from rolling around. This forms a dual-stabilized structure of bottom positioning and top support, reducing the impact of vibration on the grinding accuracy of the bearing housing and effectively improving processing quality and production efficiency.

[0018] 2. The top clamp assembly, consisting of a sliding plate, pressure block, balance plate, counterweight, and lifting counterweight structure, applies downward pressure to the top of the bearing housing, thus securing the bearing housing in conjunction with the bottom clamp assembly. The sliding plate, driven by a motor, rotates a threaded rod in both directions, allowing it to slide up and down within the plate. The pressure block compresses the bearing housing, and the balance plate keeps the two counterweights horizontal on either side of the sliding plate. This allows the force of the counterweights shifting their center of gravity within the balance plate to transmit and dissipate vibrations when the bearing housing vibrates. The lifting counterweight structure utilizes the change in amplitude caused by the counterweights' vibration to transmit downward pressure, further dissipating vibrations during bearing housing grinding. Thus, the balance plate and counterweights, through the force generated by the shift in the center of gravity, transmit and dissipate vibrations when the bearing housing vibrates, weakening the impact of vibration horizontally. The lifting counterweight structure, by applying downward pressure in a timely manner based on the changes in the counterweights' vibration amplitude, further dissipates vibration energy, achieving vibration suppression in the vertical direction. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0021] Figure 2 This is a schematic diagram of the overall side structure of this utility model;

[0022] Figure 3 This is a schematic diagram of the bottom clamp assembly of this utility model;

[0023] Figure 4 This is a schematic diagram of the shrinkage structure of this utility model;

[0024] Figure 5 This is a schematic diagram of the internal structure of the concave seat of this utility model;

[0025] Figure 6 This is a schematic diagram of the top clamp assembly of this utility model;

[0026] Figure 7 This is a schematic diagram of the overall structure of the top clamp assembly of this utility model.

[0027] Reference numerals: 1. Base; 11. Carriage; 12. Motor; 13. Threaded rod;

[0028] 2. Base clamp assembly; 21. Concave seat; 211. Partition plate; 212. Vibration-absorbing plate; 213. Compression structure; 2131. Air hood; 2132. Counter-pressure hood; 214. Vibration deflector;

[0029] 22. Elastic airbag; 23. Fixing plate;

[0030] 24. Support frame structure; 241. Contraction tube; 242. Liquid bladder; 243. Connecting plate;

[0031] 25. Retractable structure; 251. Actuator; 252. Retractable rod;

[0032] 3. Top clamp assembly; 31. Slide plate; 32. Pressure block; 33. Support plate; 34. Top seat; 35. Top column; 36. Balance plate; 37. Counterweight;

[0033] 38. Lifting counterweight structure; 381. Connecting rod; 382. Counterweight ball; 383. Spring

[0034] 100. Bearing housing. Detailed Implementation

[0035] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model.

[0036] The present invention will be further described below with reference to the embodiments.

[0037] Example: Refer to Figures 1 to 7 High-precision grinding fixtures for machining aluminum alloy wheel hub bearing housings, including:

[0038] A base 1 has a slide 11 fixedly connected to the edge of the center position of the upper end face of the base 1. A motor 12 is fixedly connected to the upper end face of the slide 11. A threaded rod 13 is fixedly connected to the output end of the motor 12. The other end of the threaded rod 13 is rotatably connected to the upper end face of the base 1.

[0039] The base 1 is used to fix the slide 11, while the motor 12 is used to drive the rotation of the threaded rod 13.

[0040] Reference Figures 1 to 2 A bottom clamp assembly 2 is provided at the center of the upper end face of the base 1. The bottom clamp assembly 2 includes a concave seat 21 fixedly connected to the upper end face of the base 1. A bearing seat 100 is placed in the concave part of the concave seat 21.

[0041] The concave seat 21 in the bottom clamp assembly 2 is used to position and lift the bearing seat 100.

[0042] Reference Figures 2 to 5 Inside the concave seat 21, partition plates 211 are fixedly connected to both sides of the concave arc surface. The partition plates 211 form two liquid zones and one vacuum zone inside the concave seat 21, with the vacuum zone located between the two liquid zones. Vibration-absorbing plates 212 are fixedly connected to the bottom of both liquid zones, and one liquid zone stores a non-Newtonian liquid. Multiple vibration-inducing plates 214 are fixedly connected to the concave arc surface of the concave seat 21 in a ring array. A compression structure 213 is provided on the side of the partition plate 211 away from the concave arc surface, and the compression structure 213 is located inside the liquid zone. The compression structure 213 includes an elastic gas cover 2131 fixedly connected to the side of the partition plate 211, and a counter-pressure cover 2132 is fixedly connected to the other end of the elastic gas cover 2131.

[0043] The concave arc surface inside the concave seat 21 and the vibration eliminator 214 are used to guide the vibration generated by the bearing seat 100 located in the concave part of the concave seat 21 to the vacuum region. The elastic gas cover 2131 and the counter-pressure cover 2132 in the compression structure 213 are used to further guide the vibration guided to the vacuum region into the liquid region. The non-Newtonian liquid in the liquid region further consumes the vibration in the vacuum region.

[0044] Reference Figures 4 to 5 Both sides of the concave seat 21 are fixedly connected to elastic airbags 22, and the elastic airbags 22 are connected to the liquid area. The elastic airbags 22 contain non-Newtonian liquid, and the other side of the elastic airbags 22 is connected to a fixing plate 23.

[0045] The non-Newtonian liquid stored in the elastic airbag 22 is introduced into the liquid zone by the fixed plate 23 under pressure, thereby increasing the amount of non-Newtonian liquid in the liquid zone. This increases the pressure of the liquid on the elastic air cover 2131 through the counter-pressure cover 2132, causing the elastic air cover 2131 to be compressed. This further increases the pressure in the vacuum zone, thereby improving the consumption and transmission of vibration in the vacuum zone.

[0046] Reference Figures 3 to 5 The base 1 is provided with a shrinking structure 25 on the upper end face of the concave seat 21. The shrinking structure 25 includes a driver 251 fixedly connected to the upper end face of the concave seat 21. Both sides of the driver 251 are fixedly connected to shrinking rods 252, and the other side of the shrinking rods 252 is fixedly connected to the fixing plate 23.

[0047] The extension and retraction of the retraction rod 252 is controlled by the driver 251, thereby realizing the actual pressure of the retraction rod 252 on the elastic airbag 22 by the fixed plate 23.

[0048] Reference Figures 3 to 5 Support frame structures 24 are provided on both sides of the upper end face of the concave seat 21, and the support frame structures 24 correspond to the liquid area. The support frame structure 24 includes two contraction tubes 241 fixedly connected to the upper end face of the concave seat 21 located in the liquid area, and each contraction tube 241 stores non-Newtonian liquid. The other end of each of the two contraction tubes 241 is fixedly connected to a liquid bladder 242, which stores gel-like liquid. The other end of the two liquid bladders 242 is fixedly connected to a connecting plate 243, and the other side of the connecting plate 243 contacts the bearing seat 100.

[0049] The non-Newtonian liquid stored in the elastic air bladder 22 is introduced into the liquid zone by the shrink tube 241 in the support frame structure 24, thereby increasing the amount of non-Newtonian liquid in the liquid zone. The shrink tube 241 also extends accordingly. The compressed shrink tube 241 will drive the liquid bladder 242 and the connecting plate 243 to contact the bearing seat 100.

[0050] Reference Figures 6 to 7 The slide 11 is provided with a top clamp assembly 3. The top clamp assembly 3 includes a slide plate 31 that is slidably connected inside the slide 11. The side of the slide plate 31 facing the threaded rod 13 is threadedly connected to the rod body of the threaded rod 13. A pressure block 32 is fixedly connected to the side of the slide plate 31 facing the bearing seat 100. A top seat 34 is fixedly connected to the other side of the slide plate 31. A top column 35 is fixedly connected to the other side of the top seat 34. A balance plate 36 is fixedly connected to the other side of the top column 35.

[0051] The threaded rod 13 drives the slide plate 31 in the top clamp assembly 3 to slide up and down in the slide frame 11, thereby enabling the slide plate 31 to drive the pressure block 32 to contact the bearing seat 100, thus providing downward pressure to the bearing seat 100, and cooperating with the bottom clamp assembly 2 to fix the bearing seat 100, while the top seat 34 is used to achieve the balance of the balance plate 36 under normal conditions.

[0052] Reference Figure 7 The skateboard 31 is fixedly connected to support plates 33 on both sides. A counterweight 37 is slidably connected to the center of the support plate 33. The side of the counterweight 37 away from the bearing seat 100 is fixedly connected to the rope balance plate 36.

[0053] The counterweight 37 is guided and prevented from swaying by the support plate 33. The counterweight 37 is connected to the balance plate 36 by a rope, which can maintain the balance of the balance plate 36 under normal conditions.

[0054] Reference Figure 7 The upper surface of the counterweight block 37 and both sides of the balance plate 36 are provided with lifting counterweight structures 38. The lifting counterweight structure 38 includes a connecting rod 381 fixedly connected to the upper surface of the counterweight block 37. Two counterweight balls 382 are slidably connected to the rod body of the connecting rod 381. A spring 383 is fixedly connected between the two counterweight balls 382, ​​and the spring 383 is sleeved on the rod body of the connecting rod 381.

[0055] The balance plate 36 is used to keep the two counterweights 37 horizontal on both sides of the slide plate 31, so that when the bearing seat 100 vibrates, the force of the change of the center of gravity of the counterweights 37 in the balance plate 36 is used to transmit and consume the vibration force. The lifting counterweight structure 38 utilizes the change in amplitude of the vibration of the counterweights 37 due to vibration.

[0056] The working principle of this utility model is as follows:

[0057] First, the operator places the bearing housing 100 into the recess of the concave seat 21, completing the initial positioning of the bearing housing 100. Then, the operator turns on the motor 12, which drives the threaded rod 13 to rotate. The threaded rod 13 drives the slide plate 31 to slide downwards within the slide frame 11, causing the pressure block 32 to gradually contact the top of the bearing housing 100, applying downward pressure to the bearing housing 100. This, combined with the bottom clamp assembly 2, achieves the initial fixation of the bearing housing 100. Simultaneously, the operator starts the driver 251, which controls the extension and retraction of the retraction rod 252. The retraction rod 252 drives the fixing plate 23 to compress the elastic airbag 22, and the elastic airbag... The non-Newtonian liquid in the airbag 22 enters the liquid zone of the concave seat 21 under pressure. The amount of non-Newtonian liquid in the liquid zone increases, which increases the pressure on the counter-pressure cover 2132, compressing the elastic air cover 2131. The pressure in the vacuum zone increases, improving the ability to consume and transmit vibrations. As the amount of non-Newtonian liquid in the liquid zone increases, the contraction tube 241 extends, driving the liquid bag 242 and the connecting plate 243 to move upward until the connecting plate 243 contacts the top of the bearing seat 100, thus supporting the top of the bearing seat 100 and buffering the vibration of the bearing seat 100 through the gel-like liquid in the liquid bag 242.

[0058] As the operator starts the grinding machine, the bearing housing 100 is ground. During the grinding process, the vibration generated by the bearing housing 100 is guided to the vacuum zone through the concave arc surface of the concave seat 21 and the vibration absorbing plate 214. The vibration in the vacuum zone is transmitted to the liquid zone through the elastic gas cover 2131 and the counter-pressure cover 2132. The non-Newtonian liquid in the liquid zone and the vibration absorbing plate 212 consume the vibration energy, reducing the impact of vibration on the accuracy of the bearing housing 100.

[0059] When the bearing housing 100 vibrates, the balance plate 36 drives the counterweight block 37 to slide on the support plate 33. The force generated by the change in the center of gravity is transmitted and consumes part of the vibration force. When the counterweight block 37 vibrates, the counterweight ball 382 in the lifting counterweight structure 38 slides on the connecting rod 381. The spring 383 is compressed or stretched, and the force generated further consumes the vibration energy of the bearing housing 100, suppressing vibration from the vertical direction.

[0060] After the grinding process is completed, the operator turns off the motor 12 and the grinding machine, and reverses the starter 251, causing the retraction rod 252 to retract. The fixing plate 23 no longer compresses the elastic air bladder 22, and the elastic air bladder 22 returns to its original shape. The non-Newtonian liquid portion in the liquid area flows back to the elastic air bladder 22, the retraction tube 241 shortens, and the connecting plate 243 separates from the bearing housing 100. The operator then restarts the motor 12, causing the threaded rod 13 to rotate in the reverse direction. The sliding plate 31 drives the pressure block 32 to move upward, releasing the clamping of the bearing housing 100. Finally, the finished bearing housing 100 is removed from the concave seat 21.

[0061] The above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions will not cause the essence of the corresponding technical solutions to deviate from the protection scope of the technical solutions of the embodiments of this utility model.

Claims

1. A high-precision grinding jig for machining an aluminum alloy hub bearing seat, characterized by, include; A base (1) is fixedly connected to a slide (11) at the center of the upper surface of the base (1). A motor (12) is fixedly connected to the upper surface of the slide (11). A threaded rod (13) is fixedly connected to the output end of the motor (12). The other end of the threaded rod (13) is rotatably connected to the upper surface of the base (1).

2. The high-precision grinding jig for aluminum alloy wheel hub bearing seat machining according to claim 1, characterized in that, A bottom clamp assembly (2) is provided at the center of the upper end face of the base (1). The bottom clamp assembly (2) includes a concave seat (21) fixedly connected to the upper end face of the base (1). A bearing seat (100) is placed in the concave part of the concave seat (21).

3. The high-precision grinding jig for aluminum alloy wheel hub bearing seat machining according to claim 2, characterized in that, The concave seat (21) has partition plates (211) fixedly connected to both sides of the concave arc surface inside. The partition plates (211) form two liquid zones and one vacuum zone inside the concave seat (21), and the vacuum zone is located between the two liquid zones. The bottom of the two liquid zones is fixedly connected to a vibration-absorbing plate (212), and one liquid zone stores a non-Newtonian liquid. The concave arc surface of the concave seat (21) is fixedly connected to a ring array of multiple vibration-inducing plates (214). A compression structure (213) is provided on the side of the partition plate (211) away from the concave arc surface, and the compression structure (213) is located in the liquid zone. The compression structure (213) includes an elastic gas cover (2131) fixedly connected to the side of the partition plate (211), and a counter-pressure cover (2132) is fixedly connected to the other end of the elastic gas cover (2131).

4. The high-precision grinding jig for aluminum alloy wheel hub bearing seat machining according to claim 3, characterized in that, Both sides of the concave seat (21) are fixedly connected to elastic airbags (22), and the elastic airbags (22) are connected to the liquid area. The elastic airbags (22) contain non-Newtonian liquid, and the other side of the elastic airbags (22) is connected to a fixing plate (23).

5. The high-precision grinding jig for aluminum alloy wheel hub bearing seat machining according to claim 4, characterized in that, The base (1) is provided with a shrinking structure (25) on the upper end face of the concave seat (21) at the center position. The shrinking structure (25) includes a driver (251) fixedly connected to the upper end face of the concave seat (21). Both sides of the driver (251) are fixedly connected to shrinking rods (252), and the other side of the shrinking rods (252) is fixedly connected to the fixing plate (23).

6. The high-precision grinding jig for aluminum alloy wheel hub bearing seat machining according to claim 5, characterized in that, Support frame structures (24) are provided on both sides of the upper surface of the concave seat (21), and the support frame structures (24) correspond to the liquid area. The support frame structure (24) includes two contraction tubes (241) fixedly connected to the upper surface of the concave seat (21) located in the liquid area, and each contraction tube (241) stores non-Newtonian liquid. The other end of each of the two contraction tubes (241) is fixedly connected to a liquid bladder (242), which stores gel-like liquid. The other end of the two liquid bladders (242) is fixedly connected to a connecting plate (243), and the other side of the connecting plate (243) is in contact with the bearing seat (100).

7. The high-precision grinding fixture for machining aluminum alloy wheel hub bearing seats according to claim 2, characterized in that, The slide (11) is provided with a top clamp assembly (3), which includes a slide plate (31) slidably connected inside the slide (11). The side of the slide plate (31) facing the threaded rod (13) is threadedly connected to the rod body of the threaded rod (13). A pressure block (32) is fixedly connected to the side of the slide plate (31) facing the bearing seat (100). A top seat (34) is fixedly connected to the other side of the slide plate (31). A top column (35) is fixedly connected to the other side of the top seat (34). A balance plate (36) is fixedly connected to the other side of the top column (35).

8. The high-precision grinding fixture for machining aluminum alloy wheel hub bearing seats according to claim 7, characterized in that, The slide plate (31) is fixedly connected to support plates (33) on both sides. A counterweight (37) is slidably connected to the center of the support plate (33). The side of the counterweight (37) away from the bearing seat (100) is fixedly connected to the rope balance plate (36).

9. The high-precision grinding jig for aluminum alloy wheel hub bearing seat machining according to claim 8, characterized in that, The upper surface of the counterweight block (37) and both sides of the balance plate (36) are provided with lifting counterweight structures (38). The lifting counterweight structure (38) includes a connecting rod (381) fixedly connected to the upper surface of the counterweight block (37). The rod (381) has two counterweight balls (382) slidably connected to its body. A spring (383) is fixedly connected between the two counterweight balls (382), and the spring (383) is sleeved on the rod (381).

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