A hub detects bearing hole roughness auxiliary fixture

Abstract

The application relates to the technical field of hub detection, in particular to a hub detection bearing hole roughness auxiliary clamp, which comprises a hub, a bottom plate, an upright block, short shafts, support sleeves, a base, a long shaft, a handle, a propelling structure and a detection head. The top right end of the bottom plate is fixedly connected with the upright block. The right end of the upright block is fixedly connected with two short shafts. The short shafts are provided with the support sleeves. The top right end of the bottom plate is fixedly connected with the base. The base is rotationally connected with the long shaft. The right end of the long shaft is fixedly connected with the handle. The left end of the long shaft is screwedly connected with a lead screw. The left side of the lead screw is fixedly connected with a fixed plate. The left side of the fixed plate is fixedly connected with a mounting rod. The mounting rod is fixedly connected with the detection head through fixing bolts. The propelling structure is arranged. The adjustable feeding mechanism realizes one-hand operation and stable feeding, the detection head is accurately and controllably contacted with the hole wall to be detected, and the stability and the repeat precision of measurement are guaranteed.

Description

Technical Field

[0001] This invention belongs to the field of wheel hub inspection technology, specifically relating to an auxiliary fixture for inspecting the roughness of bearing holes in wheel hubs. Background Technology

[0002] In the manufacturing process of automotive wheel hubs, the surface roughness of the bearing bore is a key parameter affecting the bearing assembly accuracy, operational stability, and service life, and its machining quality requirements are extremely stringent. However, due to the complex overall structure and irregular shape of the wheel hub, lacking a unified reference surface or symmetrical features, stable clamping and precise positioning are difficult to achieve under conventional testing conditions. This results in the roughness measuring probe being unable to reliably contact the inner wall of the bearing bore, or even being unable to enter the measurement position at all. Therefore, in existing technologies, the roughness of wheel hub bearing bores often cannot be measured under normal conditions, severely restricting the effective implementation of online quality control.

[0003] However, existing bearing hole roughness testing often relies on manual handheld measuring instruments with auxiliary support, typically requiring two operators: one to hold the hub and the other to operate the roughness meter. This method is not only labor-intensive and inefficient, but also prone to human error due to unstable hub positioning and difficulty in controlling probe angle and pressure. This results in poor repeatability and accuracy of test results, failing to meet the quality traceability requirements of high-precision manufacturing. Therefore, there is an urgent need for an auxiliary fixture for testing bearing hole roughness in hubs to solve these problems. Summary of the Invention

[0004] In order to overcome the above-mentioned technical problems, the purpose of this invention is to provide an auxiliary fixture for inspecting the roughness of bearing holes in wheel hubs, so as to solve the problem mentioned in the background art that the roughness of bearing holes is often detected by manual hand-held measuring instruments with auxiliary support.

[0005] To achieve the above objectives, the present invention provides the following technical solution: an auxiliary fixture for inspecting bearing hole roughness in a wheel hub, comprising a wheel hub, a base plate, a vertical block, a short shaft, a support sleeve, a base, a long shaft, a handle, a propulsion structure, and a detection head. The vertical block is fixedly connected to the top right end of the base plate, and two short shafts are fixedly connected to the right end of the vertical block. A support sleeve is fitted onto the short shaft. The base is fixedly connected to the top right end of the base plate. The long shaft is rotatably connected to the middle of the base via a double bearing. The handle is fixedly connected to the right end of the long shaft. The propulsion structure includes a lead screw. The lead screw is threadedly connected to the left end of the long shaft. A fixing plate is fixedly connected to the left side of the lead screw. A limiting rod is fixedly connected to the right rear end of the fixing plate. The limiting rod is slidably connected to the base. An installation rod is fixedly connected to the left side of the fixing plate. A fixing cover is fixedly connected to the right side of the detection head. The fixing cover is fitted onto the installation rod, and the installation rod is fixedly connected to the fixing cover via fixing bolts.

[0006] Preferably, the bottom of the hub rests against the support sleeve, and the bearing hole of the hub is coaxially aligned with the detection head.

[0007] Preferably, the base plate is an L-shaped plate, and its top baffle limits and blocks the side of the wheel hub.

[0008] Preferably, the short shaft includes a cylindrical part on the right end and a Morse code No. 2 tapered shank on the left end, and the short shaft is horizontally fixed to the block by a tapered fit.

[0009] Preferably, a limiting plate is fixedly connected to the outer wall of the limiting rod, and the diameter of the limiting plate is larger than the diameter of the limiting rod.

[0010] Preferably, the left end of the detection head is molded from polyurethane rubber, and a roughness tester probe is installed inside the detection head.

[0011] Preferably, the top of the fixing cover is provided with a sliding groove, and the diameter of the sliding groove corresponds to the diameter of the threaded rod of the fixing bolt. The top of the fixing bolt is provided with an internal hexagonal nut, and the bottom of the fixing bolt abuts against the fixing cover.

[0012] Compared with the prior art, the beneficial effects of the present invention are:

[0013] 1. This auxiliary fixture for inspecting the roughness of bearing holes in wheel hubs is equipped with a propulsion structure. When the wheel hub is fixed on the vertical block, the bearing hole of the wheel hub can be coaxially aligned with the inspection head, facilitating inspection. The wheel hub is not limited and typically has a bearing chamber or similar structure. The handle drives the long shaft to rotate in the base. The left end of the long shaft has a precision trapezoidal thread pair machined inside, forming a threaded engagement with the lead screw of the propulsion structure. The thread drives the lead screw to feed linearly. The lead screw drives the limiting rod to slide and guide on the base through the fixing plate, while simultaneously pushing the mounting rod and the inspection head to move horizontally, achieving precise alignment and progressive contact of the wheel hub bearing hole. The scale on the limiting rod cooperates with the pointer at the end of the long shaft to display and precisely control the feed displacement of the inspection head in real time, ensuring accurate measurement stroke. The adjustable feed mechanism enables single-handed operation and smooth feed, allowing the inspection head to accurately and controllably contact the wall of the hole to be measured, ensuring measurement stability and repeatability.

[0014] 2. This auxiliary fixture for inspecting bearing hole roughness in a wheel hub is equipped with a vertical block, short shafts, and a support sleeve. The wheel hub is supported by two short shafts on the vertical block and its support sleeve, and its bearing hole automatically remains coaxial with the inspection head. The L-shaped structure of the base plate limits the wheel hub from the side to prevent it from rotating or shifting during the inspection process. The positioning support structure reliably supports the wheel hub using a tapered shank short shaft and achieves self-centering without the need for repeated manual calibration. It is also detachably connected to the vertical block, providing a stable benchmark for roughness inspection and ensuring the reliability of the measurement results. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the hub placement according to the present invention;

[0016] Figure 2 This is a schematic diagram of the wheel hub detection process according to the present invention;

[0017] Figure 3 This is a frontal perspective view of the present invention;

[0018] Figure 4 This is a schematic diagram of the exploded structure of the present invention;

[0019] Figure 5 This is a schematic diagram of the propulsion structure of the present invention.

[0020] In the diagram: 1. Hub; 11. Bearing hole; 2. Base plate; 3. Stand block; 4. Short shaft; 5. Support sleeve; 6. Base; 7. Long shaft; 8. Handle; 9. Propulsion structure; 91. Lead screw; 92. Fixing plate; 93. Limiting rod; 94. Limiting plate; 95. Mounting rod; 96. Fixing bolt; 10. Detection head; 101. Fixing cover. Detailed Implementation

[0021] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0022] Please see Figure 1-5This invention provides an embodiment of an auxiliary fixture for inspecting bearing hole roughness in a wheel hub, comprising a wheel hub 1, a base plate 2, a vertical block 3, short shafts 4, a support sleeve 5, a base 6, a long shaft 7, a handle 8, a propulsion structure 9, and a detection head 10. The top right end of the base plate 2 is fixedly connected to the vertical block 3, and the right end of the vertical block 3 is fixedly connected to two short shafts 4. Support sleeves 5 are fitted onto the short shafts 4. The top right end of the base plate 2 is fixedly connected to the base 6, and the middle of the base 6 is rotatably connected to the long shaft 7 via double bearings. The right end of the long shaft 7 is fixedly connected to the handle 8. The propulsion structure 9 includes a lead screw 91, the left end of the long shaft 7 is threadedly connected to the lead screw 91, and the left side of the lead screw 91 is fixedly connected to a fixing plate 92. A limiting rod 93 is fixedly connected to the right rear end of the 92 plate, and the limiting rod 93 is slidably connected to the base 6. An mounting rod 95 is fixedly connected to the left side of the fixing plate 92, and a fixing cover 101 is fixedly connected to the right side of the detection head 10. The fixing cover 101 is fitted onto the mounting rod 95, and the mounting rod 95 is fixedly connected to the fixing cover 101 by fixing bolts 96. The lead screw 91 is threadedly connected to the long shaft 7, which facilitates the adjustment of the initial position of the detection head 10. The inner cavity of the long shaft 7 is provided with a trapezoidal thread pair (pitch 0.5mm) that matches the lead screw 91. When the hub 1 is clamped, the coaxiality error between the axis of its bearing hole 11 and the axis of the detection head 10 is ≤0.02mm, providing a stable reference for roughness measurement.

[0023] Furthermore, the base plate 2 is an L-shaped plate, and its top baffle limits and blocks the side of the hub 1, effectively preventing the hub 1 from accidentally sliding or rotating laterally during the inspection process, ensuring the stability of the measurement process and the positioning reliability of the workpiece being measured. The vertical surface of the baffle is ground (flatness ≤ 0.01 mm) and is used to press against the non-machined side of the hub 1 to achieve axial limitation.

[0024] Furthermore, the short shaft 4 includes a cylindrical part on the right end and a Morse taper 2 shank on the left end. The short shaft 4 is horizontally fixed to the vertical block 3 through a taper fit. The Morse taper shank fit provides extremely high positioning accuracy and connection rigidity, ensuring that the position of the support sleeve 5 remains stable and providing a solid and accurate support reference for the wheel hub 1. The short shaft 4 and support sleeve 5 assembly can be replaced to adapt to different models of wheel hub 1, thus ensuring that the bearing hole 11 of the wheel hub 1 can always be coaxially aligned with the detection head 10.

[0025] Furthermore, a limiting plate 94 is fixedly connected to the outer wall of the limiting rod 93. The diameter of the limiting plate 94 is larger than the diameter of the limiting rod 93. The limiting plate 94 prevents the limiting rod 93 from detaching from the base 6, thereby preventing the lead screw 91 from detaching from the long shaft 7. To further improve the detection accuracy and ease of operation, a scale is provided on the limiting rod 93, and a pointer is provided at the end of the long shaft 7. The pointer corresponds to the scale on the limiting rod 93 and is used to display the feed displacement of the detection head 10 in real time. The operator can preset the feed stroke according to the depth of the bearing hole 11 of the hub 1 to avoid overfeeding or underfeeding.

[0026] Furthermore, the left end of the detection head 10 is made of polyurethane rubber molding. The detection head 10 is equipped with a roughness tester probe, which is made of polyurethane rubber with a Shore hardness of 65. The end of the polyurethane rubber is soft and elastic, and the end is a 1.5mm rounded transition, which can play a buffering and protective role when contacting the hole wall, preventing scratches on the workpiece surface. At the same time, the internal probe can accurately sense the surface contour.

[0027] Furthermore, the top of the fixing cover 101 is provided with a sliding groove, and the diameter of the sliding groove corresponds to the diameter of the threaded rod of the fixing bolt 96. The top of the fixing bolt 96 is provided with an internal hex nut, and the bottom of the fixing bolt 96 abuts against the fixing cover 101. The detection head 10 and the lead screw 91 are connected through a quick-change interface. The sliding groove design allows the detection head 10 to be pulled out after the fixing bolt 96 is loosened, and the detection head 10 can be quickly installed and replaced. Different materials or shapes of detection heads 10 can be replaced according to different measurement needs, expanding the applicability of the fixture. The operation is simple and reliable.

[0028] Working Principle: In use, first, place the hub 1 on the top plane of the base plate 2, ensuring its side is against the L-shaped baffle of the base plate 2. The baffle is precision ground, providing a high-precision axial reference surface for the hub 1, ensuring it does not shift laterally. Next, the bottom of the hub 1 should rest stably against two support sleeves 5. The support sleeves 5 are mounted on the upright block 3 via short shafts 4, which use a Morse taper shank No. 2 to engage with the tapered hole of the upright block 3. This tapered fit provides extremely high positioning accuracy and connection rigidity, ensuring the stable and unchanging support point position of the support sleeves 5. By replacing different specifications of the short shafts 4 and support sleeves 5, the support height and position can be adjusted to accommodate hubs 1 of different sizes. Under the limiting effect of the L-shaped baffle and the stable support of the two support sleeves 5, the axis of its bearing hole 11 can be precisely adjusted to match the axis height of the detection head 10, achieving a precise alignment with a coaxiality error of no more than 0.02 mm. This design establishes a stable and reliable reference for subsequent roughness measurements; achieves extremely high clamping repeatability; the flatness of the vertical baffle of the L-shaped base plate 2 is controlled within 0.01 mm, providing an axial reference for the hub 1 and eliminating the possibility of accidental lateral displacement of the workpiece during measurement; the Morse taper shank mating short shaft 4 system provides support rigidity, avoiding measurement errors caused by loosening or deformation of the support components; finally, the modular design of the short shaft 4 and support sleeve 5 expands the compatibility of the fixture; for hubs 1 of different sizes or structures, the operator does not need to replace the entire fixture or make complex mechanical adjustments, but only needs to select the corresponding specification of support sleeve 5 and short shaft 4 combination for replacement, which can ensure that all models of hubs 1 can be accurately positioned on the center line of the detection head 10; while ensuring high accuracy in single measurement, it also greatly improves the adaptability of the fixture to different production batches and different product models, improving detection efficiency and equipment utilization;

[0029] Once the hub 1 is precisely positioned, the operator rotates the handle 8; the handle 8 drives the long shaft 7 to rotate smoothly under the support of the double bearings on the base 6; the left end of the long shaft 7 has a precision trapezoidal thread pair machined inside, forming a threaded engagement with the lead screw 91 of the propulsion structure 9; therefore, the rotational motion of the long shaft 7 is converted into the precise linear motion of the lead screw 91 and the entire propulsion structure 9 fixedly connected to it through the thread pair; the limiting rod 93 on the right side of the fixing plate 92 slides in the guide hole of the base 6, effectively preventing the propulsion structure 9 from rotating during movement and ensuring the linearity of the movement; the fixing plate 92 drives the mounting rod 95 and the detection head 10 mounted on it to move smoothly and uniformly to the left. The left end of the detection head 10 is molded from polyurethane rubber with a Shore hardness of 65, and the end is designed with a rounded transition. When it gently contacts and enters the inner wall of the bearing hole 11, the soft rubber end acts as a buffer and protects, preventing scratches on the precision surface of the workpiece. At the same time, the roughness measuring probe encapsulated inside the detection head 10 accurately senses and records the micro-profile undulations of the hole wall surface, completing the acquisition of roughness data. The scale set on the limit rod 93 and the end of the long shaft 7... The pointer, in conjunction with the sensor, allows for real-time display and precise control of the feed displacement of the detection head 10, ensuring accurate measurement stroke. The dual-bearing-supported long shaft 7 and the trapezoidal thread drive ensure extremely smooth and stable advancement of the detection head 10, crucial for roughness measurements requiring continuous scanning of surface contours, preventing data distortion caused by feed jitter. Furthermore, the guiding function of the limit rod 93 and the coordination between the scale and the pointer transform the feed process from experience-based operation to quantifiable and pre-programmable precise control. The operator can adjust the feed according to the pre-set position of the hub bearing hole 11. Knowing the depth, the system pre-sets and monitors the feed stroke, effectively avoiding the risk of incomplete measurement due to insufficient feed or damage to the inspection head 10 or workpiece due to excessive feed. Finally, the polyurethane rubber protective layer design at the front end of the inspection head 10 ensures that the internal probe can accurately contact the workpiece surface while maximally protecting the inner wall of the bearing hole 11 being inspected, preventing secondary scratches during the measurement process. This is especially suitable for the inspection of precision parts with extremely high requirements for surface integrity. The entire system combines mechanical precision, operational controllability, and workpiece protection.

[0030] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. An auxiliary fixture for inspecting bearing hole roughness in a wheel hub, comprising a wheel hub (1), a base plate (2), a vertical block (3), a short shaft (4), a support sleeve (5), a base (6), a long shaft (7), a handle (8), a propulsion structure (9), and an inspection head (10), characterized in that: The top right end of the base plate (2) is fixedly connected to a vertical block (3), and the right end of the vertical block (3) is fixedly connected to two short shafts (4). A support sleeve (5) is fitted on the short shafts (4). The top right end of the base plate (2) is fixedly connected to a base (6). The middle of the base (6) is rotatably connected to a long shaft (7) via a double bearing. The right end of the long shaft (7) is fixedly connected to a handle (8). The propulsion structure (9) includes a lead screw (91). The left end of the long shaft (7) is threadedly connected to the lead screw (91). The left side of the lead screw (91) is fixedly connected to the fixing plate (92), the right side of the rear end of the fixing plate (92) is fixedly connected to the limiting rod (93), the limiting rod (93) is slidably connected to the base (6), the left side of the fixing plate (92) is fixedly connected to the mounting rod (95), the right side of the detection head (10) is fixedly connected to the fixing cover (101), the fixing cover (101) is sleeved on the mounting rod (95), and the mounting rod (95) is fixedly connected to the fixing cover (101) by fixing bolts (96).

2. The auxiliary fixture for inspecting bearing hole roughness in a wheel hub according to claim 1, characterized in that: The bottom of the hub (1) rests against the support sleeve (5), and the bearing hole (11) of the hub (1) is coaxially corresponding to the detection head (10).

3. The auxiliary fixture for inspecting bearing hole roughness in a wheel hub according to claim 1, characterized in that: The base plate (2) is an L-shaped plate, and its top baffle limits and blocks the side of the wheel hub.

4. The auxiliary fixture for inspecting bearing hole roughness in a wheel hub according to claim 1, characterized in that: The short shaft (4) includes a cylindrical part on the right end and a Morse taper 2 shank on the left end. The short shaft (4) is horizontally fixed on the block (3) by a taper fit.

5. The auxiliary fixture for inspecting bearing hole roughness in a wheel hub according to claim 1, characterized in that: The outer wall of the limiting rod (93) is fixedly connected to the limiting plate (94), and the diameter of the limiting plate (94) is larger than the diameter of the limiting rod (93).

6. The auxiliary fixture for inspecting bearing hole roughness in a wheel hub according to claim 1, characterized in that: The left end of the detection head (10) is made of polyurethane rubber molding, and a roughness tester probe is installed inside the detection head (10).

7. The auxiliary fixture for inspecting bearing hole roughness in a wheel hub according to claim 1, characterized in that: The top of the fixing cover (101) is provided with a sliding groove, and the diameter of the sliding groove corresponds to the diameter of the thread rod of the fixing bolt (96). The top of the fixing bolt (96) is provided with an internal hexagonal nut, and the bottom of the fixing bolt (96) abuts against the fixing cover (101).

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