Asymmetric maintenance-free hub bearing and machining method thereof

Abstract

The invention discloses an asymmetric maintenance-free hub bearing and a machining method thereof.The asymmetric maintenance-free hub bearing comprises an outer ring, a first inner ring, a second inner ring, a plurality of small rollers and a plurality of large rollers, and the small rollers are arranged between the outer ring wall of the first inner ring and the inner ring wall of the outer ring; the large rollers are arranged between the outer ring wall of the second inner ring and the inner ring wall of the outer ring, the inner side wall of the outer ring is provided with a roller path matched with the small rollers and a roller path matched with the large rollers, the roller path and the roller path are arranged side by side, and the end, opposite to the second inner ring, of the first inner ring is provided with a clamping spring. And the first inner ring and the second inner ring are mutually spliced through the snap spring. According to the asymmetric maintenance-free hub bearing disclosed by the invention, through the arrangement of the small rollers and the large rollers, the bearing of the asymmetric bearing can be effectively realized in a manner that the sizes of the rollers are different.

Description

Technical Field

[0001] The invention relates to a bearing, and more particularly to an asymmetric maintenance-free hub bearing and a processing method thereof. Background Art

[0002] Maintenance-free wheel hub bearings are products for lifelong use. The market's requirements for high efficiency and low energy consumption of bearings are becoming more and more stringent. Not only that, the requirements for the overall structural space of the bearings are also getting smaller and smaller. The structural space is small, but the bearing load requirements are still very high. The structural rhythm and product load-bearing performance requirements are high, which has become the main problem in bearing design. Most of the existing asymmetric wheel hub bearings are in the form of hybrid bearings. For example, the invention patent with announcement number CN106089993B and name of method and device for obtaining load distribution of ball-cone hybrid double-row wheel hub bearings discloses a device for ball-cone hybrid bearings. However, in actual use, the loads borne by the positions near the two ends of the bearing also have a small difference, and the load-bearing capacity of the spherical bearing is much smaller than that of the tapered bearing, which will also lead to a decrease in the overall load-bearing capacity of the bearing. Therefore, the existing asymmetric bearings are not suitable for occasions with a small difference in load-bearing capacity. Summary of the invention

[0003] In view of the deficiencies in the prior art, the object of the present invention is to provide an asymmetric maintenance-free hub bearing with high load-bearing capacity and suitable for a small load-bearing capacity gap, and a processing method thereof.

[0004] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: an asymmetric maintenance-free hub bearing, comprising an outer ring, a first inner ring, a second inner ring, a plurality of small rollers and a plurality of large rollers, wherein the plurality of small rollers are arranged between the outer ring wall of the first inner ring and the inner ring wall of the outer ring, and the plurality of large rollers are arranged between the outer ring wall of the second inner ring and the inner ring wall of the outer ring, so that the first inner ring and the second inner ring are arranged side by side in the outer ring, characterized in that: a raceway adapted to the small rollers and a raceway adapted to the large rollers are arranged side by side on the inner side wall of the outer ring, and a retaining spring is provided at the end opposite to the second inner ring, so that the first inner ring and the second inner ring are spliced ​​to each other through the retaining spring.

[0005] As a further improvement of the present invention, the outer side wall of one end of the outer ring close to the first inner ring is arched outward to form a flange, and a thread groove is formed on the end surface of the outer ring, and the thread groove extends into the flange.

[0006] As a further improvement of the present invention, the inner ring wall of the outer ring is provided with a small raceway having a beveled cross-section, a length matching the length of the small roller, and a large raceway having a length matching the length of the large roller. One side of the small raceway and the large raceway faces the center of the outer ring, and the other side faces the two ends of the outer ring respectively, and is inclined toward the outer side wall of the outer ring.

[0007] As a further improvement of the present invention, the inner side wall of the outer ring at one end close to the first inner ring is provided with a mounting rib, the inner side wall of the outer ring at one end close to the second inner ring is provided with a sealing rib, and the outer side walls of the first inner ring and the second inner ring at one end opposite to each other are both bulged outward to form a large rib, and the large rib forms an annular platform for installing the sealing ring, so as to cooperate with the mounting rib and the sealing rib to install the sealing ring.

[0008] As a further improvement of the present invention, the retaining spring is formed by a plurality of chain plates connected to each other by hinges, the chain plates are evenly divided into two retaining blocks with the hinge as the center, a plurality of retaining grooves are provided on the inner ring walls at opposite ends of the first inner ring and the second inner ring, and the first inner ring and the second inner ring are spliced ​​by embedding the retaining blocks into the retaining grooves one by one.

[0009] As a further improvement of the present invention, the small roller is covered with a small roller retainer, the large roller is covered with a large roller retainer, and an ABS signal ring is fixed on the end surface of one end of the outer ring close to the second inner ring.

[0010] Another aspect of the present invention provides a processing method for processing the above-mentioned asymmetric bearing, comprising an outer ring processing step, a first inner ring processing step and a second inner ring processing step, wherein the first inner ring processing step is the same as the second inner ring processing step, and the outer ring processing step comprises the following: Step 1: Forge the outer ring blank, normalize it, turn it, induction harden the raceway, fine turn the end face and sealing rib, grind the outer diameter, grind the two raceways of the outer ring blank at the same time, mainly using a grinding wheel for finishing, and then perform rough grinding, finish grinding and super finishing on the raceway obtained by grinding, and finally trim the outer diameter indentation to complete the processing of the outer ring; The processing steps of the first inner ring are as follows: Step 2: Forge the inner ring blank, then machine it into shape, and then quench the inner ring as a whole. After quenching, grind the end face of the inner ring blank to produce a small raceway, and then perform rough grinding of the raceway, rough grinding of the inner diameter, and fine grinding of the raceway. Further grind out the large rib and the outer diameter of the rib, and then perform fine grinding of the inner diameter and super-fine grinding of the raceway and the large rib to complete the inner ring processing.

[0011] The beneficial effect of the present invention is that, through the arrangement of large rollers and small rollers, two raceways can be formed between the outer ring and the two inner rings, the two raceways are asymmetrical, and the rolling element at the end with a larger load is larger, thereby improving the bearing capacity of the bearing. At the same time, compared with the hybrid bearing structure in the prior art, both rolling elements can adopt tapered rolling elements, thus avoiding the problem of the bearing being unusable due to the poor bearing capacity of one of the rolling elements when there is a difference in the applied load but the difference is small. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a schematic diagram of the cross-sectional structure of the asymmetric maintenance-free hub bearing of the present invention; Figure 2 for Figure 1 Schematic diagram of the structure of the middle and outer circles; Figure 3 for Figure 1 Schematic diagram of the structure of the second inner circle. DETAILED DESCRIPTION

[0013] The present invention will be further described below in detail with reference to the embodiments shown in the accompanying drawings.

[0014] Reference Figures 1 to 3 As shown, an asymmetric maintenance-free hub bearing of this embodiment comprises an outer ring 1, a first inner ring 2, a second inner ring 3, a plurality of small rollers 4 and a plurality of large rollers 6, wherein the plurality of small rollers 4 are arranged between the outer ring wall of the first inner ring 2 and the inner ring wall of the outer ring 1, and the plurality of large rollers 6 are arranged between the outer ring wall of the second inner ring 3 and the inner ring wall of the outer ring 1, so that the first inner ring 2 and the second inner ring 3 are arranged side by side in the outer ring 1, and the characteristic is that: a raceway adapted to the small rollers 4 and a raceway adapted to the large rollers 6 are arranged side by side in the inner side wall of the outer ring 1, and the first inner ring 2 is provided with a retaining spring 8 at one end opposite to the second inner ring 3, so as to splice the first inner ring 2 and the second inner ring 3 to each other through the retaining spring 8. The wheel hub bearing adopting the above structure can form an asymmetric raceway on the inner ring wall of the outer ring 1 through the action of the large roller 6 and the small roller 4, thereby improving the bearing capacity of the bearing. Furthermore, compared with the hybrid bearing in the prior art, the bearing capacity difference between the two raceways is smaller, and the problem of the bearing being unusable due to the poor bearing capacity of one of the rolling elements will not occur. At the same time, the same kind of rolling elements can be selected to facilitate the processing of the bearing and reduce the manufacturing cost of the bearing.

[0015] In this embodiment, for the convenience of installation, the outer wall of the outer ring 1 at one end close to the first inner ring 2 is arched outward to form a flange. The outer ring 1 is provided with a thread groove on the end face of this end, and the thread groove extends into the flange. The flange can provide the outer ring 1 with sufficient space to form a thread groove.

[0016] Furthermore, in the present embodiment, a small raceway 12 having a beveled cross-section and a length matching the length of the small roller 4 and a large raceway 13 having a length matching the length of the large roller 6 are provided on the inner ring wall of the outer ring 1. One side of the small raceway 12 and the large raceway 13 is toward the center of the outer ring 1, and the other side is toward the two ends of the outer ring 1 respectively, and is inclined toward the outer side wall of the outer ring 1. By setting the small raceway 12 and the large raceway 13, it is possible to simply and effectively provide the raceways for the small roller 4 and the large roller 6.

[0017] Further, in this embodiment, the inner side wall of the outer ring 1 near the end of the first inner ring 2 is provided with a mounting flange 14, the inner side wall of the outer ring 1 near the end of the second inner ring 3 is provided with a sealing flange 15, the outer side walls of the first inner ring 2 and the second inner ring 3 opposite to each other are both raised outward to form a large flange 35, the large flange 35 forms an annular platform for installing a sealing ring, so as to cooperate with the mounting flange 14 and the sealing flange 15 to install the sealing ring, and the retaining spring 8 is formed by splicing a plurality of chain plates with hinges, and the chain plates are averagely centered on the hinge. There are two clamping blocks 81, and a plurality of clamping grooves 16 are provided on the inner ring wall at the opposite end of the first inner ring 2 and the second inner ring 3. The first inner ring 2 and the second inner ring 3 are spliced ​​by embedding the clamping blocks into the clamping grooves 16 one by one. By utilizing the function of the retaining spring 8, the splicing of the first inner ring 2 and the second inner ring 3 is simply and effectively achieved. At the same time, a small roller retainer 5 is mounted on the small roller 4, a large roller retainer 7 is mounted on the large roller 6, and an ABS signal ring 11 is fixed on the end face of the outer ring 1 close to the second inner ring 3.

[0018] On the other hand, the present embodiment provides a method for processing the outer ring 1, the first inner ring 2 and the second inner ring 3 of the asymmetric bearing. The method is specifically as follows: Outer ring: outer ring blank casting - outer ring blank normalizing - outer ring blank machining - outer ring blank raceway induction quenching - end face and sealing rib finishing - outer diameter fine grinding - two raceways grinding and finishing with grinding wheels at the same time to ensure the consistency of the two raceways of the product - raceway rough grinding - raceway fine grinding - raceway super finishing - outer diameter indentation finishing Through the implementation of this process, especially the end face and sealing rib finishing instead of conventional grinding, the processing efficiency of the product is improved, while the quality of the product is guaranteed; the induction hardening of the two raceways and the simultaneous grinding of the raceways improve the quality of the product and the load-bearing capacity of the product.

[0019] Inner ring: inner ring blank forging - inner ring blank turning - inner ring overall quenching - end face grinding - raceway rough grinding - inner diameter rough grinding - raceway fine grinding - grinding large rib + rib outer diameter at the same time - inner diameter fine grinding - super fine raceway and rib Through the implementation of this process, especially the simultaneous grinding of the large rib + rib outer diameter, the processing efficiency of the product is improved, while ensuring the quality of the product.

[0020] In summary, the asymmetric maintenance-free hub bearing of this embodiment has two raceways, the two raceways are asymmetric, and the rolling element at the end with greater load is larger, thereby improving the bearing capacity. In order to improve the bearing capacity and wear resistance of the bearing, the two raceways are induction hardened; in order to improve the consistency of the product, the two raceways are ground once to improve the quality and processing efficiency of the product; in order to improve the processing efficiency and stability of the product, the two end faces of the outer ring and the flanges at the sealing joint are not ground, and fine turning is performed after heat treatment; in order to improve the processing efficiency, the inner ring flange and the outer diameter of the flange are synchronously ground, which not only improves the efficiency but also improves the quality consistency of the product. The ABS signal ring is installed at the outer ring flange, with a simple structure and compact installation.

[0021] The above is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments. All technical solutions under the concept of the present invention belong to the protection scope of the present invention. It should be pointed out that for ordinary technicians in this technical field, some improvements and modifications without departing from the principle of the present invention should also be regarded as the protection scope of the present invention.

Claims

1. An asymmetric maintenance-free hub bearing, comprising an outer ring (1), a first inner ring (2), a second inner ring (3), a plurality of small rollers (4) and a plurality of large rollers (6), wherein the plurality of small rollers (4) are arranged between the outer ring wall of the first inner ring (2) and the inner ring wall of the outer ring (1), and the plurality of large rollers (6) are arranged between the outer ring wall of the second inner ring (3) and the inner ring wall of the outer ring (1), so that the first inner ring (2) and the second inner ring (3) are arranged side by side in the outer ring (1), characterized in that: The inner side wall of the outer ring (1) is provided with a raceway that is compatible with the small roller (4) and a raceway that is compatible with the large roller (6) arranged side by side with each other, and a retaining spring (8) is provided at one end of the first inner ring (2) opposite to the second inner ring (3) so that the first inner ring (2) and the second inner ring (3) are spliced ​​together by the retaining spring (8).

2. The asymmetric maintenance-free hub bearing according to claim 1, characterized in that: The outer wall of one end of the outer ring (1) close to the first inner ring (2) is arched outward to form a flange, and a thread groove is provided on the end surface of the outer ring (1), and the thread groove extends into the flange.

3. The asymmetric maintenance-free hub bearing according to claim 2, characterized in that: The inner ring wall of the outer ring (1) is provided with a small raceway (12) having a beveled cross-section and a length matching that of the small roller (4) and a large raceway (13) having a length matching that of the large roller (6). One side of the small raceway (12) and the large raceway (13) faces the center of the outer ring (1), and the other side faces the two ends of the outer ring (1) and is inclined toward the outer wall of the outer ring (1).

4. The asymmetric maintenance-free hub bearing according to claim 3, characterized in that: An inner side wall of the outer ring (1) at one end close to the first inner ring (2) is provided with a mounting rib (14), an inner side wall of the outer ring (1) at one end close to the second inner ring (3) is provided with a sealing rib (15), and outer side walls of the first inner ring (2) and the second inner ring (3) at the ends opposite to each other are both raised outwards to form a large rib (35), the large rib (35) forming an annular platform for mounting a sealing ring, so as to cooperate with the mounting rib (14) and the sealing rib (15) to mount the sealing ring.

5. The asymmetric maintenance-free hub bearing according to claim 4, characterized in that: The clamping spring (8) is formed by a plurality of chain plates connected to each other via hinges. The chain plates are evenly divided into two clamping blocks (81) with the hinge as the center. A plurality of clamping grooves (16) are provided on the inner ring walls at opposite ends of the first inner ring (2) and the second inner ring (3). The first inner ring (2) and the second inner ring (3) are spliced ​​by embedding the clamping blocks into the clamping grooves (16) one by one.

6. The asymmetric maintenance-free hub bearing according to claim 5, characterized in that: The small roller (4) is covered with a small roller retainer (5), the large roller (6) is covered with a large roller retainer (7), and an ABS signal ring (11) is fixed on an end surface of the outer ring (1) close to the second inner ring (3).

7. A method for processing an asymmetric maintenance-free hub bearing, applicable to the asymmetric maintenance-free hub bearing according to any one of claims 1 to 6, characterized in that: The method comprises an outer ring (1) processing step, a first inner ring (2) processing step and a second inner ring (3) processing step, wherein the first inner ring (2) processing step is the same as the second inner ring (3) processing step, and the outer ring (1) processing step comprises the following: Step 1, forging the outer ring blank, normalizing the outer ring blank, turning the outer ring blank into shape, induction quenching the outer ring blank raceway, fine turning the outer ring blank end face and the sealing rib, further fine grinding the outer diameter, and then grinding the two raceways of the outer ring blank at the same time, mainly using a grinding wheel to shape the raceway, and then rough grinding, fine grinding and super-fine grinding the raceway obtained by grinding, and finally finishing the outer diameter indentation to complete the processing of the outer ring (1); The processing steps of the first inner ring (2) are as follows: Step 2, the inner ring blank is forged and then machined into shape, and then the inner ring blank is quenched as a whole. The inner ring blank after quenching is end-face ground to produce a small raceway (12), and then the raceway is rough ground, the inner diameter is rough ground, and the raceway is fine ground. The large rib (35) and the outer diameter of the rib are further ground, and then the inner diameter is fine ground and the raceway and the large rib (35) are super fine ground to complete the inner ring processing.

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