Hub bearing sealing structure

Abstract

The utility model discloses a hub bearing sealing structure which comprises an outer flange, an inner flange and a rolling body, a rolling cavity for the rolling body to move is formed between the outer flange and the inner flange, and the left side wall of the inner flange is bent towards the direction of the left side wall of the outer flange to be connected with a blocking edge. The inner wall of the flange is in clearance fit with the left side wall of the outer flange, an opening is formed between the inner wall of the flange and the left side wall of the outer flange, first sealing structures used for sealing the rolling cavity are arranged on the two sides of the rolling body correspondingly, and one first sealing structure is arranged close to the opening; and a second sealing structure which is used for being in linkage fit with the first sealing structure so as to adjust the shape in a self-adaptive manner during high-speed operation of the bearing and is in clearance fit with the inner wall of the flange is arranged in the opening. The sealing structure of the hub bearing solves the problems that a sealing structure of a traditional hub bearing is low in sealing strength, and a sealing structure with high sealing strength is inconvenient to disassemble and assemble.

Description

Technical Field

[0001] The utility model relates to the technical field of wheel hub bearings, in particular to a wheel hub bearing sealing structure. Background Art

[0002] In the automotive industry, the sealing performance of wheel hub bearings is crucial for ensuring vehicle safety and extending wheel hub life. Conventional wheel hub bearing sealing structures, when used under various operating conditions, especially at high speeds, suffer from insufficient sealing strength, difficulty in assembly and disassembly, and susceptibility to external mud and slurry intrusion. These issues not only increase maintenance costs but can also pose safety hazards. For example, the sealing structure between the outer and inner flanges of conventional wheel hub bearings has low sealing performance, making it very easy for impurities such as mud or gravel to infiltrate the bearing interior through the sealing joints, affecting bearing operation and even causing bearing failure. Conventional wheel hub bearings with high sealing structures, however, have a sealed bearing structure because their sealing structure encloses the bearing interior. Although this seal strength is excessive, the sealing structure is connected to the inner circumference of the outer flange and the outer circumference of the inner flange. Specifically, the sealing structure's ends are tightened with the inner circumference of the outer flange and the outer circumference of the inner flange, respectively. This compromises bearing assembly efficiency, making assembly and disassembly difficult. Furthermore, the sealing structure's connection or tightening during operation also affects bearing efficiency. Utility Model Content

[0003] In view of the shortcomings of the existing technology, the utility model provides a hub bearing sealing structure to solve the problem that the sealing structure of the traditional hub bearing has low sealing strength and the sealing structure with high sealing strength is inconvenient to disassemble and assemble.

[0004] To achieve the above-mentioned purpose, the utility model provides a wheel hub bearing sealing structure, including an outer flange, an inner flange and a rolling body, a rolling cavity for the rolling body to move is formed between the outer flange and the inner flange, the left side wall of the inner flange is bent toward the left side wall of the outer flange and is connected to a rib, the inner wall of the rib and the left side wall of the outer flange are gap-matched and an opening is formed, a first sealing structure for sealing the rolling cavity is provided on both sides of the rolling body, one of the first sealing structures is arranged near the opening, and a second sealing structure is provided in the opening for cooperating with the first sealing structure to adaptively adjust the shape when the bearing runs at high speed and to gap-match with the inner wall of the rib.

[0005] The advantages of adopting the above technical solution are: in the above technology, the first sealing structure is set to seal the rolling cavity to reduce the probability and amount of external mud or gravel invading the rolling cavity, and the second sealing structure is set to cooperate with the inner wall clearance of the rib when the bearing is running and heating up, thereby preventing external mud or gravel from invading the interior of the bearing through the opening, that is, the opening is set towards the external wheel position and the function of the opening is to facilitate the assembly of the bearing components. At the same time, the side of the bearing close to the opening position bears more impurities than the side of the bearing far away from the opening position, that is, when the wheel is running, external mud or gravel can easily pass through the wheel to cover or invading the bearing, thereby causing external mud, gravel, water stains and other impurities to invading the interior of the bearing through the opening, and the second sealing structure is set to The design is used to reduce the possibility of foreign impurities such as mud, gravel, or water stains intruding into the bearing through the opening. Specifically, the second seal cooperates with the first seal to adaptively reduce the opening diameter when the bearing is running, thereby preventing the intrusion of foreign impurities. This improves the sealing of the opening and the sealing strength of the hub bearing. At the same time, when the bearing is not running, it will not adaptively adjust its shape, thereby exposing the opening for operators to disassemble and assemble the bearing. At the same time, the clearance fit is set to avoid affecting the relative high-speed rotation rate of the outer flange and the inner flange, thereby avoiding affecting the operating efficiency of the hub bearing. The above-mentioned technical settings achieve adaptive adjustment of the bearing during high-speed operation, effectively preventing the intrusion of foreign mud, and significantly improving the sealing strength. At the same time, the simplified disassembly and assembly design makes the maintenance process more convenient and reduces maintenance costs.

[0006] The present invention is further provided with: the first sealing structure includes a first skeleton arranged on the outer circumferential wall of the inner flange and a second skeleton arranged on the inner circumferential wall of the outer flange, the first skeleton and the second skeleton are arranged opposite to each other and a sealing groove is formed between the inner wall of the first skeleton and the inner wall of the second skeleton, the radial cross-sections of the first skeleton and the second skeleton are both arranged in an "L" shape, the inner wall of the second skeleton is bent toward the inner wall of the first skeleton to have at least one first sealing lip, the first sealing lip is tightly fitted with the inner wall of the first skeleton, the outer circumferential wall of the first skeleton is bent toward the inner wall of the second skeleton to have a mating edge, the outer circumferential wall of the mating edge is gap-fitted with the inner circumferential wall of the second skeleton and a through groove for connecting with the sealing groove is formed.

[0007] The benefits of adopting the above technical solution are: in the above technology, the first skeleton, the second skeleton and the first sealing lip are set to improve the sealing strength at both ends of the rolling cavity, thereby preventing external impurities from invading the rolling cavity. At the same time, the first sealing lip is tightly fitted with the inner wall of the first skeleton, further improving the sealing strength of the sealing groove to reduce the probability of intrusion of external impurities. At the same time, the through groove is set to form a winding groove in combination with the sealing groove, that is, to improve the path of external impurities when invading, thereby preventing external impurities from invading the rolling cavity through the sealing groove and affecting the roller. At the same time, the width and diameter of the through groove are limited to reduce the probability and amount of intrusion of external impurities. The sealing strength at both ends of the rolling cavity is further improved through the setting of the above technology, thereby improving the sealing strength of the rolling cavity.

[0008] The utility model is further provided with: a plurality of second sealing lips are extended from the inner peripheral wall of the second skeleton near the right side wall of the outer flange toward the corresponding outer peripheral wall of the first skeleton, and the plurality of second sealing lips are all arranged in the through groove, and a slot is formed between adjacent second sealing lips; a third sealing lip is extended from the outer peripheral wall of the first skeleton near the right side wall of the outer flange toward each adjacent slot position, and each of the third sealing lips is matched with the corresponding slot gap and combined to form a labyrinth groove.

[0009] The benefits of adopting the above technical solution are: the second sealing lip and the third sealing lip in the above technology are used to improve the sealing strength of the through groove. At the same time, the second sealing lip, the third sealing lip and the combination with the slot form a winding labyrinth groove, which increases the path for external impurities to invade, thereby preventing external impurities from invading the rolling cavity through the sealing groove and affecting the roller, while reducing the probability and amount of external impurities invading. The setting of the above technology further improves the sealing strength at both ends of the rolling cavity, thereby improving the sealing strength of the rolling cavity.

[0010] The present invention is further provided with: a second skeleton near the opening position is bent toward the opening direction to form a third skeleton, the inner wall of the third skeleton is connected to the left side wall of the outer flange, the second sealing structure includes a sealing edge arranged on the third skeleton, a limiting groove is circumferentially provided on the inner wall of the retaining edge, the radial cross-section of the limiting groove is arc-shaped, the sealing edge is made of shape memory alloy, the sealing edge has a first form within a first temperature range, and the sealing edge has a second form within a second temperature range, the sealing edge is bent toward the limiting groove in the first form and the inner wall of the sealing edge is gap-matched with the inner wall of the limiting groove, the sealing edge is bent toward the outer peripheral wall of the outer flange in the second form and the sealing edge is separated from the limiting groove.

[0011] The benefits of adopting the above technical solution are: when the bearing is running, the bearing will gradually heat up, so that the bearing temperature is greater than 30 degrees. At this time, the temperature range is the first temperature range, and the sealing edge has a first form in the first temperature range. The sealing edge is bent toward the limit groove in the first form, and the inner wall of the sealing edge is matched with the gap of the inner wall of the limit groove, that is, the sealing edge is placed in the limit groove and matched with the gap of the limit groove to form an arc-shaped gap, thereby increasing the difficulty of external impurities invading the limit groove through the gap, thereby improving the sealing strength of the opening, and preventing impurities from invading the first sealing structure through the opening and invading the rolling cavity through the first sealing structure; when the bearing is not running or stops running, the bearing temperature gradually drops and is lower than 30 degrees. At this time, the temperature range is the second temperature range. The sealing edge has a second form within a second temperature range. In the second form, the sealing edge is bent toward the outer peripheral wall of the outer flange and the sealing edge is separated from the limiting groove, thereby facilitating the operator to assemble or disassemble the bearing, thereby improving the efficiency of disassembly of the bearing components; in the above technology, the arc-shaped limiting groove and the sealing edge are matched to reduce the joint between the two, thereby increasing the difficulty of external impurities invading, thereby improving the sealing strength; in the above technology, the sealing edge is made of shape memory alloy, which is an intelligent material with a unique shape memory effect. This alloy can change its shape under specific conditions and restore to its original shape when a certain critical temperature is reached. It is an existing technology, so its specific principles and structure will not be described in detail.

[0012] The utility model is further provided with: a wheel bolt for connecting to an external wheel component is provided on the retaining edge, the sealing edge is bent toward the nut end of the wheel bolt to have an extended edge, and the outer peripheral wall of the extended edge of the sealing edge is gap-fitted with the outer peripheral wall of the nut end of the wheel bolt in the first form.

[0013] The benefits of adopting the above technical solution are: in the above technology, when the sealing edge is in the first form, the outer peripheral wall of the extended edge and the outer peripheral wall of the nut end of the wheel bolt are clearance-matched, thereby improving the joint path between the two and increasing the difficulty of external impurities invading, thereby improving the sealing strength between the retaining edge and the sealing edge, thereby preventing external impurities from invading the rolling cavity through the opening; the wheel bolts in the above technology are existing technology, that is, bolts are connected between the outer flange of the traditional hub bearing and the external wheel component. Since it is existing technology, its structure and function will not be described in detail.

[0014] The present invention is further provided with: a fourth sealing lip extending from the third frame toward the inner wall of the rib, and the fourth sealing lip is provided in a clearance-matched manner with the rib.

[0015] The benefit of adopting the above technical solution is that the provision of the fourth sealing lip in the above technology further improves the sealing strength of the opening, thereby preventing foreign matter from invading the rolling cavity through the opening. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a partial cross-sectional schematic diagram of the operating state of the utility model;

[0017] Figure 2 for Figure 1 Partial enlarged view of part A in the middle;

[0018] Figure 3 It is a partial cross-sectional schematic diagram of the operating state of the utility model;

[0019] Figure 4 for Figure 3 A partial enlarged view of part B. DETAILED DESCRIPTION

[0020] The utility model provides a hub bearing sealing structure, comprising an outer flange 1, an inner flange 2 and a rolling element 11, wherein a rolling cavity 12 for the rolling element 11 to move is formed between the outer flange 1 and the inner flange 2, the left side wall of the inner flange 2 is bent toward the left side wall of the outer flange 1 and connected to a rib 3, the inner wall of the rib 3 and the left side wall of the outer flange 1 are gap-matched and an opening 13 is formed, and both sides of the rolling element 11 are provided with a first sealing structure for sealing the rolling cavity 12, one of the first sealing structures is arranged close to the opening 13, and a second sealing structure for cooperating with the first sealing structure to adaptively adjust the shape when the bearing runs at high speed and to cooperate with the inner wall gap of the rib 3 is provided in the opening 13, the first sealing structure includes a sealing structure arranged on the inner flange 2 The first skeleton 21 on the outer peripheral wall and the second skeleton 14 arranged on the inner peripheral wall of the outer flange 1, the first skeleton 21 and the second skeleton 14 are arranged opposite to each other and a sealing groove 15 is formed between the inner wall of the first skeleton 21 and the inner wall of the second skeleton 14, the radial cross-sections of the first skeleton 21 and the second skeleton 14 are both arranged in an "L" shape, the inner wall of the second skeleton 14 is bent toward the inner wall of the first skeleton 21 to have at least one first sealing lip 141, the first sealing lip 141 is tightly fitted with the inner wall of the first skeleton 21, the outer peripheral wall of the first skeleton 21 is bent toward the inner wall of the second skeleton 14 to have a matching edge 22, the outer peripheral wall of the matching edge 22 is gap-matched with the inner peripheral wall of the second skeleton 14 and forms a through groove for communicating with the sealing groove 15, close to the outer flange The inner peripheral wall of the second frame 14 at the right side wall position of 1 extends toward the outer peripheral wall of the corresponding first frame 21, and a plurality of second sealing lips 142 are arranged in the through groove, and a slot is formed between adjacent second sealing lips 142. The outer peripheral wall of the first frame 21 near the right side wall position of the outer flange 1 extends toward each adjacent slot position with a third sealing lip 23, and each of the third sealing lips 23 is matched with the corresponding slot gap and combined to form a labyrinth groove 24. The second frame 14 near the opening 13 is bent toward the opening 13 with a third frame 31. The inner wall of the third frame 31 is connected to the left side wall of the outer flange 1. The second sealing structure includes a sealing edge 31 provided on the third frame 31. 2. A limiting groove 33 is circumferentially provided on the inner wall of the rib 3. The radial cross-section of the limiting groove 33 is arc-shaped. The sealing edge 32 is made of a shape memory alloy. The sealing edge 32 has a first form in a first temperature range and a second form in a second temperature range. In the first form, the sealing edge 32 is bent toward the limiting groove 33, and the inner wall of the sealing edge 32 is clearance-matched with the inner wall of the limiting groove 33. In the second form, the sealing edge 32 is bent toward the outer peripheral wall of the outer flange 1, and the sealing edge 32 is separated from the limiting groove 33. A wheel bolt 34 for connecting to an external wheel component is provided on the rib 3. The sealing edge 32 is bent to have an extended edge 321 toward the nut end of the wheel bolt 34.In the first configuration, the outer peripheral wall of the extended edge 321 of the sealing edge 32 is provided with a clearance fit between the outer peripheral wall of the nut end of the wheel bolt 34. A fourth sealing lip 311 extends from the third frame 31 toward the inner wall of the rib 3, and the fourth sealing lip 311 is provided with a clearance fit between the rib 3.

[0021] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions only illustrate the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which shall fall within the scope of the present invention to be protected. The scope of protection claimed by the present invention is defined by the attached claims and their equivalents.

Claims

1. A hub bearing sealing structure, comprising an outer flange, an inner flange, and a rolling element, wherein a rolling cavity for the rolling element is formed between the outer flange and the inner flange, the left side wall of the inner flange is bent toward the left side wall of the outer flange and connected to a rib, and an inner wall of the rib is gap-fitted with the left side wall of the outer flange to form an opening, characterized in that: A first sealing structure for sealing the rolling cavity is provided on both sides of the rolling body, one of the first sealing structures is arranged close to the opening, and a second sealing structure is provided in the opening for cooperating with the first sealing structure to adaptively adjust the shape when the bearing runs at high speed and cooperate with the inner wall clearance of the rib.

2. A hub bearing sealing structure according to claim 1, characterized in that: The first sealing structure includes a first skeleton arranged on the outer circumferential wall of the inner flange and a second skeleton arranged on the inner circumferential wall of the outer flange. The first skeleton and the second skeleton are arranged opposite to each other and a sealing groove is formed between the inner wall of the first skeleton and the inner wall of the second skeleton. The radial cross-sections of the first skeleton and the second skeleton are both arranged in an "L" shape. The inner wall of the second skeleton is bent toward the inner wall of the first skeleton to form at least one first sealing lip. The first sealing lip is tightly fitted with the inner wall of the first skeleton. The outer circumferential wall of the first skeleton is bent toward the inner wall of the second skeleton to form a mating edge. The outer circumferential wall of the mating edge is gap-fitted with the inner circumferential wall of the second skeleton and a through groove for connecting with the sealing groove is formed.

3. The wheel hub bearing sealing structure according to claim 2, characterized in that: A plurality of second sealing lips are extended from the inner peripheral wall of the second skeleton near the right side wall of the outer flange toward the corresponding outer peripheral wall of the first skeleton, and the plurality of second sealing lips are arranged in the through groove, and a slot is formed between adjacent second sealing lips. A third sealing lip is extended from the outer peripheral wall of the first skeleton near the right side wall of the outer flange toward each adjacent slot position, and each of the third sealing lips cooperates with the corresponding slot gap and is combined to form a labyrinth groove.

4. The hub bearing sealing structure according to claim 2, characterized in that: The second skeleton near the opening position is bent toward the opening direction to form a third skeleton, and the inner wall of the third skeleton is connected to the left side wall of the outer flange. The second sealing structure includes a sealing edge arranged on the third skeleton, and a limiting groove is circumferentially arranged on the inner wall of the retaining edge. The radial cross-section of the limiting groove is arc-shaped. The sealing edge is made of shape memory alloy. The sealing edge has a first form within the first temperature range and a second form within the second temperature range. In the first form, the sealing edge is bent toward the limiting groove and the inner wall of the sealing edge is gap-matched with the inner wall of the limiting groove. In the second form, the sealing edge is bent toward the outer peripheral wall of the outer flange and the sealing edge is separated from the limiting groove.

5. The hub bearing sealing structure according to claim 4, characterized in that: The retaining edge is provided with a wheel bolt for connecting to an external wheel component, and the sealing edge is bent toward the nut end of the wheel bolt to form an extended edge. In the first form, the outer peripheral wall of the extended edge of the sealing edge is gap-fitted with the outer peripheral wall of the nut end of the wheel bolt.

6. The wheel hub bearing sealing structure according to claim 4, characterized in that: A fourth sealing lip is extended from the third frame toward the inner wall of the rib, and the fourth sealing lip is arranged in a clearance fit with the rib.

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