A wheel hub bearing end surface processing tool

Abstract

The present invention relates to the field of bearing processing technology, and in particular, to a wheel hub bearing end face processing tool, comprising: a fixing device capable of clamping and fixing the outer ring of the wheel hub bearing, the inner ring of the wheel hub bearing being provided with a center hole, a centering shaft being installed in the center hole, the centering shaft being capable of driving the inner ring of the wheel hub bearing to rotate coaxially relative to the outer ring, a top assembly comprising a top shaft, the top shaft being coaxially arranged with the centering shaft; the centering shaft comprising a centering groove facing the top shaft, the cross section of the centering groove perpendicular to the direction of its central axis being circular, the centering groove gradually shrinking toward the central axis in the process of extending from the opening to away from the opening; the top shaft being provided with a top end facing the centering groove, the top end being capable of extending into the centering groove and at least partially abutting against the inner side wall of the centering groove, so as to drive the centering shaft to rotate. In this way, the problem that the end face of the wheel hub bearing is easily skewed during processing, resulting in processing over-tolerance and low yield is solved.

Description

Technical Field

[0001] The invention relates to the technical field of bearing processing, and in particular to a tool for processing the end face of a hub bearing. Background Art

[0002] The life and rigidity of tapered roller hub bearing units are better than those of ball bearings of the same size, so they are widely used in pickup trucks, large SUVs and commercial vehicles. However, ball bearings have developed to the third generation (HUB spindle integration) and have been widely used. In contrast, most tapered roller bearings use two single-row bearings due to production constraints, or only use the first-generation hub bearings and the second-generation hub bearings. Therefore, the hub bearings of vehicle manufacturers and the market need to assemble the spindle when replacing, and there is a possibility that market problems such as abnormal noise may occur due to poor press-fitting and excessive or insufficient preload. As a result, the demand for 2.5-generation hub bearings (with installed spindles) and 3rd-generation hub bearing products is increasing. Among them, 2.5-generation hub bearings have gradually become the leading products in SUVs and pickup trucks.

[0003] In the prior art, a driving shaft or other device is usually directly abutted against the spline end face of the hub bearing flange, which is a face-to-face abutment directly in the axial direction, and friction is used to drive the inner ring of the hub bearing to rotate. However, the above-mentioned abutment connection method lacks radial limitation, resulting in unstable rotation, which leads to a low yield of the finished product. Summary of the invention

[0004] In order to solve the problem that the end face of the wheel hub bearing is easily skewed during machining, resulting in machining tolerance and low yield, the present invention provides a wheel hub bearing end face machining tool, including: a fixing device, a centering shaft, and a center assembly; the fixing device can clamp and fix the outer ring of the wheel hub bearing, the inner ring of the wheel hub bearing is provided with a center hole, the centering shaft is installed in the center hole, the centering shaft can drive the inner ring of the wheel hub bearing to rotate coaxially relative to the outer ring, and the center assembly includes a center shaft, and the center shaft is coaxially arranged with the centering shaft; the centering shaft includes a centering groove facing the center shaft, the cross-section of the centering groove perpendicular to the center axis direction thereof is circular, and the centering groove gradually shrinks toward the center axis in the process of extending from the opening to away from the opening; the center shaft is provided with a top end portion facing the centering groove, the top end portion can extend into the centering groove and at least partially abut against the inner side wall of the centering groove, so as to drive the centering shaft to rotate.

[0005] In some embodiments, a fitting surface is provided at the tip end, and a shape of the fitting surface matches the inner side surface of the centering groove.

[0006] In some embodiments, the inner side wall of the centering groove is provided with a knurled structure, and the fitting surface is provided with a knurled structure.

[0007] In some embodiments, an internal spline is provided in the center hole, and the centering shaft includes a spline shaft matching the internal spline and a positioning flange. The spline shaft can extend into the internal spline, and a positioning surface is provided on the inner ring toward the extension direction of the spline shaft, and the positioning flange can fit on the positioning surface.

[0008] In some embodiments, the positioning surface is provided with a knurled structure.

[0009] In some embodiments, the inner side surface of the centering groove is a conical surface, and the top angle of the conical surface is 30°-60°.

[0010] In some embodiments, the ratio of the width of the accommodating surface to the maximum diameter of the tip portion is 0.2-0.3.

[0011] In some embodiments, the top assembly also includes a drive shaft and a connecting seat. The drive shaft is connected to the connecting seat and can drive the connecting seat to rotate around the central axis. A connecting hole for installing the top shaft is provided at the center of the connecting seat.

[0012] In some embodiments, the top shaft includes a connecting shaft arranged away from the top end, and the shape of the inner circumferential wall of the connecting hole matches the outer wall of the connecting shaft; a square connecting block is provided on the side of the connecting seat facing the top shaft, and a connecting groove is provided at the joint between the top shaft and the connecting seat, and the connecting block can extend into the connecting groove and fit with the inner wall of the connecting groove.

[0013] In some embodiments, a limiting shaft is further arranged between the tip end and the connecting shaft, the limiting shaft protrudes from the outer peripheral wall of the connecting shaft in the radial direction, and a limiting surface is arranged on the limiting shaft, which can abut against the side surface of the limiting seat in the direction in which the tip shaft extends.

[0014] In order to solve the problem that the end face of the hub bearing is easily skewed during machining, resulting in machining tolerance and low yield, the present invention has the following advantages:

[0015] In the above technical scheme, the outer ring of the wheel hub bearing is clamped by the provided fixing device, so that the outer ring of the wheel hub bearing can be fixed more stably without affecting the rotation of the inner ring relative to the outer ring. Since the existing processing method lacks the matching or fixation with the inner ring of the wheel hub bearing, the centering shaft provided in the above technical scheme can match with the center hole of the wheel hub bearing and is provided with a centering groove. The top shaft matches with the centering groove, so that the top shaft can rotate coaxially with the centering shaft, thereby driving the inner ring of the wheel hub bearing to achieve a more stable rotation, thereby solving the problem of insufficient processing accuracy of the end face of the wheel hub bearing. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 A schematic diagram of the split structure of a wheel hub bearing end surface processing tooling according to an embodiment is shown;

[0017] Figure 2 A schematic diagram of the working state of a hub bearing end surface processing tooling according to an embodiment is shown;

[0018] Figure 3 A schematic structural diagram of a top shaft according to an embodiment is shown;

[0019] Figure 4 Shows Figure 3 Right view of;

[0020] Figure 5 A schematic structural diagram of a centering shaft according to an embodiment is shown;

[0021] Figure 6 A schematic cross-sectional structure diagram of a centering shaft according to an embodiment is shown.

[0022] Figure markings: 10-wheel hub bearing; 11-outer ring; 12-inner ring; 13-end face; 14-center hole; 20-fixing device; 30-centering shaft; 31-centering groove; 32-spline shaft; 40-top assembly; 41-top shaft; 411-top end; 4111-fitting surface; 4112-connecting groove; 412-connecting shaft; 413-limiting shaft; 42-connecting seat. DETAILED DESCRIPTION

[0023] The present disclosure will now be discussed with reference to several exemplary embodiments. It should be understood that these embodiments are discussed only to enable those skilled in the art to better understand and thus implement the present disclosure, rather than implying any limitation on the scope of the present disclosure.

[0024] As used herein, the term "including" and its variants are to be interpreted as open-ended terms meaning "including but not limited to". The term "based on" is to be interpreted as "based at least in part on". The terms "one embodiment" and "an embodiment" are to be interpreted as "at least one embodiment". The term "another embodiment" is to be interpreted as "at least one other embodiment". The orientation or position relationship indicated by the terms "upper", "lower", "left", "right", "front", "back", "top", "bottom", "inner", "outer", "vertical", "horizontal", "lateral", "longitudinal" and the like is based on the orientation or position relationship shown in the accompanying drawings. These terms are mainly for better describing the present application and its embodiments, and are not used to limit the indicated devices, elements or components to have a specific orientation, or to be constructed and operated in a specific orientation. In addition, in addition to being used to indicate an orientation or position relationship, some of the above terms may also be used to indicate other meanings, such as the term "upper" may also be used to indicate a certain dependency or connection relationship in some cases. For those of ordinary skill in the art, the specific meanings of these terms in this application can be understood according to the specific circumstances. In addition, the terms "install", "set", "provided with", "connected" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection, or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, or it can be an internal connection between two devices, elements or components. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to the specific circumstances. In addition, the terms "first", "second", etc. are mainly used to distinguish different devices, elements or components (the specific types and structures may be the same or different), and are not used to indicate or imply the relative importance and quantity of the indicated devices, elements or components. Unless otherwise specified, "plurality" means two or more.

[0025] This embodiment discloses a wheel hub bearing end surface processing tool, such as Figure 1-6As shown, it may include: a fixing device 20, a centering shaft 30, and a top assembly 40; the fixing device 20 can clamp and fix the outer ring 11 of the hub bearing 10, the inner ring 12 of the hub bearing 10 is provided with a center hole 14, the centering shaft 30 is installed in the center hole 14, the centering shaft 30 can drive the inner ring 12 of the hub bearing 10 to rotate coaxially relative to the outer ring 11, and the top assembly 40 includes a top shaft 41, and the top shaft 41 is coaxially arranged with the centering shaft 30; the centering shaft 30 includes a centering groove 31 facing the top shaft 41, the cross section of the centering groove 31 perpendicular to the center axis direction thereof is circular, and the centering groove 31 gradually shrinks toward the center axis in the process of extending from the opening to away from the opening; the top shaft 41 is provided with a top end portion 411 facing the centering groove 31, and the top end portion 411 can extend into the centering groove 31 and at least partially abut against the inner side wall of the centering groove 31, so as to drive the centering shaft 30 to rotate.

[0026] It should be noted that the above solution of the present application is mainly used to process the end face 13 of the hub bearing 10 after assembly. Figure 1 As shown, the end face 13 is located at the bottom of the inner ring 12 of the hub bearing 10, and the dimension to be processed is the runout dimension of the end face 13 when it rotates, that is, the difference between the end face 13 and the rotating plane when it rotates. The hub bearing 10 includes an inner ring 12 and an outer ring 11. In order to ensure the normal rotation of the hub bearing 10, the hub bearing 10 is installed with positive clearance fit, that is, it can ensure that there is a gap between the components. However, the existence of these gaps also leads to the problem that even if the dimensional accuracy of each component can be guaranteed, the end face 13 to be processed will still appear after the assembly is completed. The runout dimension of the structure does not meet the design requirements. Therefore, the end face 13 must be reprocessed after the assembly is completed to meet the design requirements. The processing method can be carried out by turning, that is, the component to be processed is rotated, and the processing is completed by the linear feed of the cutting tool.

[0027] In the prior art, the driving shaft and other devices are usually directly abutted against the flange spline end face 13 of the hub bearing 10, which is a face-to-face abutment in the axial direction, and the inner ring 12 of the hub bearing 10 is driven to rotate by friction. However, the above-mentioned abutment connection method lacks radial limit, resulting in unstable rotation. In actual application, the central axis of the driving shaft may have a certain radial offset from the central axis of the abutted flange spline end face 13, causing the inner ring 12 of the hub bearing 10 to shift during rotation, and the end face 13 on the workpiece for matching may not be flat enough. The above reasons will further cause the bearing end face 13 to be tilted, and then cause the runout to exceed the tolerance after processing. In particular, for the hub bearing 10 used in larger vehicles such as trucks and jeeps, the diameter of the flange spline end face 13 is larger, which further aggravates the above-mentioned problem.

[0028] In the above technical solution of the present invention, the outer ring 11 of the hub bearing 10 is clamped by the fixing device 20, so that the outer ring 11 of the hub bearing 10 can be fixed relatively stably without affecting the rotation of the inner ring 12 relative to the outer ring 11. Since the existing processing method lacks the matching or fixing with the inner ring 12 of the hub bearing 10, the centering shaft 30 provided in the above technical solution can match with the center hole 14 of the hub bearing 10, and is provided with a centering groove 31, through the top shaft 41 and the centering groove 31, the centering shaft 30 is provided with a centering groove 31, and the centering groove 31 ... 1, on the one hand, the inner side wall of the centering groove 31 can be used to limit the top shaft 41 in the radial direction, so that the two can effectively prevent radial movement after the cooperation; on the other hand, the cooperation of the top shaft 41 and the centering groove 31 can correct the rotation axis of the hub bearing 10, so that the rotation axis of the hub bearing 10 and the central axis of the top shaft 41 have a high degree of coaxiality, thereby preventing the central axis of the inner ring 12 of the hub bearing 10 from deviating from the rotation axis, preventing eccentric rotation, and thus improving the processing accuracy. In addition, since the centering shaft 30 and the top shaft 41 are both part of the fixture, a higher processing accuracy can be adopted to avoid the situation where the product surface of the workpiece needs to be matched, improve the matching accuracy, and prevent the occurrence of runout. Through the above technical means, the problem of insufficient processing accuracy of the end face 13 of the hub bearing 10 can be effectively solved.

[0029] Among them, the fixing device 20 can be a fixed tooling commonly used on machine tools such as a fixed three-jaw chuck, or it can be a fixed clamping device that matches the outer ring 11 of the hub bearing 10. It only needs to be able to stably clamp the outer ring 11. In order to prevent the overall shaking of the workpiece due to vibration and other factors during the rotation of the inner ring 12, the fixing device 20 can have a larger overall weight, and use the larger weight to offset the shaking caused during the movement. The centering shaft 30 can be matched with the center hole 14 of the hub bearing 10 for easy installation. The centering groove 31 is set to have a circular cross section, and the centering groove 31 gradually shrinks toward the central axis during the process of extending from the opening direction to the direction away from the opening, that is, the centering groove 31 can be in the shape of a conical surface, a spherical surface or an ellipsoidal surface. The circular cross-sectional shape and the gradually shrinking structure can help the top shaft 41 to coincide with the central axis of the centering groove 31, producing a self-centering effect, and at the same time, after the top end 411 of the top shaft 41 abuts against the centering groove 31, it can be clamped while ensuring that the center position of the force is at the center axis, thereby preventing eccentricity caused by force deviation. The top end 411 can be a spherical surface, a conical surface, etc., or a circular plane, and the edge position of the circular plane abuts against the inner side surface of the centering groove 31, thereby converting the surface contact in the prior art into line contact to reduce positioning errors.

[0030] As a preferred implementation method, Figure 1-6 As shown, the top end portion 411 is provided with a fitting surface 4111 , and the shape of the fitting surface 4111 matches the inner side surface of the centering groove 31 .

[0031] Since the centering shaft 30 is rotated by the top shaft 41, in order to achieve a better synchronous rotation effect, the friction between the top end 411 and the centering groove 31 can be increased. Therefore, the setting of the fitting surface 4111 can increase the contact area between the top end 411 and the centering groove 31, thereby improving the friction.

[0032] Furthermore, the inner wall of the centering groove 31 is provided with a knurling structure, and the fitting surface 4111 is provided with a knurling structure. The knurling structure is a regular pattern of concave and convex patterns formed on the processing surface by a specific processing device, that is, the knurling structure can be provided on at least one of the inner wall of the centering groove 31 and the fitting surface 4111, and the friction between the two is increased by increasing the roughness of the contact surface.

[0033] In order to better drive the inner ring 12 of the hub bearing 10 to rotate, Figure 1 , Figure 5 as well as Figure 6 The center hole 14 is provided with an internal spline, and the centering shaft 30 includes a spline shaft 32 matching the internal spline and a positioning flange, the spline shaft 32 can extend into the internal spline, and the inner ring 12 is provided with a positioning surface toward the extending direction of the spline shaft 32, and the positioning flange can fit the positioning surface. For the center hole 14 provided with other structures, the centering shaft 30 can be provided with other structures matching therewith to improve the effect of synchronous rotation.

[0034] For the center hole 14 without internal splines or other connection structures, the through hole with smooth inner wall can be installed in the center hole 14 by interference fit. However, the wheel hub bearing 10 is made of metal material and has a large overall weight. In the absence of keyway and other matching structures, simple interference fit may not be enough to make the inner ring 12 of the wheel hub bearing 10 and the centering shaft 30 rotate completely synchronously without slipping. In order to solve the above problem, the positioning surface is provided with a knurling structure.

[0035] The relatively rough positioning surface is used to abut against the positioning flange, thereby increasing the friction between the positioning surface and the positioning flange. When rotating, the larger friction can prevent the occurrence of slipping and the like.

[0036] As a preferred embodiment, the inner side surface of the centering groove 31 is a conical surface, and the top angle of the conical surface is 30°-60°. Preferably, the top angle is set to 45°.

[0037] As a specific implementation, in order to achieve a more appropriate friction value, the ratio of the width of the fitting surface 4111 to the maximum diameter of the tip portion is 0.2-0.3.

[0038] In order to drive the top shaft 41 to rotate, Figure 1-2 As shown, the top assembly 40 also includes a driving shaft and a connecting seat 42. The driving shaft is connected to the connecting seat 42 and can drive the connecting seat 42 to rotate around the central axis. A connecting hole for mounting the top shaft 41 is provided at the center of the connecting seat 42. The driving shaft can be an output shaft of a device capable of outputting rotational power, such as a motor, and the top shaft 41 is stably connected to the driving shaft through the setting of the connecting seat 42.

[0039] To improve connection efficiency, Figure 1-4 As shown, the top shaft 41 includes a connecting shaft 412 disposed away from the top end 411, and the shape of the inner peripheral wall of the connecting hole matches the outer side wall of the connecting shaft 412; a square connecting block is disposed on the side of the connecting seat 42 facing the top shaft 41, and a connecting groove 4112 is disposed at the joint between the top shaft 41 and the connecting seat 42, and the connecting block can extend into the connecting groove 4112 and fit with the inner side wall of the connecting groove 4112. Through the cooperation between the connecting block and the connecting groove 4112, the top shaft 41 can be limited in the radial direction to ensure that the top shaft 41 will not rotate relative to the connecting hole, thereby achieving a better driving and transmission effect.

[0040] Furthermore, if Figure 1-4 As shown, a limiting shaft 413 is further provided between the top end portion 411 and the connecting shaft 412. The limiting shaft 413 protrudes from the outer peripheral wall of the connecting shaft 412 in the radial direction. The limiting shaft 413 is provided with a limiting surface, and the limiting surface can abut against the side surface of the limiting seat in the direction in which the top shaft 41 extends. The setting of the limiting shaft 413 can limit the top shaft 41 in the axial direction to prevent it from moving in the axial direction.

[0041] Those skilled in the art will appreciate that the above-mentioned embodiments are specific examples for implementing the present disclosure, and in actual applications, various changes may be made thereto in form and detail without departing from the scope of the present disclosure.

Claims

1. A wheel hub bearing end surface processing tool, characterized in that: The hub bearing end surface processing tooling comprises: Fixtures, centering shafts, center assemblies; The fixing device can clamp and fix the outer ring of the wheel hub bearing, the inner ring of the wheel hub bearing is provided with a center hole, the bottom of the inner ring of the wheel hub bearing is provided with an end face to be processed, the centering shaft is installed in the center hole, the centering shaft can drive the inner ring of the wheel hub bearing to rotate coaxially relative to the outer ring, and the top assembly includes a top shaft, and the top shaft is coaxially arranged with the centering shaft; The centering shaft includes a centering groove facing the top shaft, the cross-section of the centering groove perpendicular to the center axis thereof is circular, and the centering groove gradually shrinks toward the center axis as it extends from an opening to away from the opening; the top shaft is provided with a top end portion facing the centering groove, and the top end portion can extend into the centering groove and at least partially abut against the inner side wall of the centering groove so as to drive the centering shaft to rotate.

2. A wheel hub bearing end surface processing tool according to claim 1, characterized in that: The tip end is provided with a fitting surface, and the shape of the fitting surface matches the inner side surface of the centering groove.

3. A wheel hub bearing end surface processing tool according to claim 2, characterized in that: The inner side wall of the centering groove is provided with a knurling structure, and the fitting surface is provided with a knurling structure.

4. A wheel hub bearing end surface processing tool as claimed in claim 2, characterized in that: An internal spline is arranged in the center hole, and the centering shaft includes a spline shaft matching the internal spline and a positioning flange. The spline shaft can extend into the internal spline, and the inner ring is provided with a positioning surface toward the extending direction of the spline shaft, and the positioning flange can fit onto the positioning surface.

5. A wheel hub bearing end surface processing tool as claimed in claim 4, characterized in that: The positioning surface is provided with a knurling structure.

6. A wheel hub bearing end surface processing tool as claimed in claim 5, characterized in that: The inner side surface of the centering groove is a conical surface, and the top angle of the conical surface is 30°-60°.

7. A wheel hub bearing end surface processing tool as claimed in claim 6, characterized in that: The ratio of the width of the fitting surface to the maximum diameter of the tip end is 0.2-0.

3.

8. The wheel hub bearing end surface processing tool according to claim 6, characterized in that: The top assembly also includes a driving shaft and a connecting seat. The driving shaft is connected to the connecting seat and can drive the connecting seat to rotate around a central axis. A connecting hole for mounting the top shaft is provided at the center of the connecting seat.

9. A wheel hub bearing end surface processing tool as claimed in claim 8, characterized in that: The top shaft comprises a connecting shaft disposed away from the top end, and the shape of the inner peripheral wall of the connecting hole matches the outer side wall of the connecting shaft; A square connecting block is arranged on the side of the connecting seat facing the top shaft, and a connecting groove is arranged at the joint between the top shaft and the connecting seat. The connecting block can extend into the connecting groove and fit with the inner side wall of the connecting groove.

10. A wheel hub bearing end surface processing tool according to claim 9, characterized in that: A limiting shaft is also arranged between the top end and the connecting shaft. The limiting shaft protrudes from the outer peripheral wall of the connecting shaft in the radial direction. The limiting shaft is provided with a limiting surface, and the limiting surface can abut against the side surface of the connecting seat toward the extending direction of the top shaft.

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