A wheel hub bearing capable of preventing end cover from loosening and a process thereof

Abstract

The present invention provides a wheel hub bearing and process for preventing end caps from loosening. The wheel hub bearing comprises an inner shaft and an outer ring sleeved on the inner shaft; an end cap fitted to one end of the outer ring, with positioning slots defined on both the top and bottom outer walls of the end cap; a positioning plug-in mechanism disposed at the end of the outer ring and inserted into the positioning slot; an inflation mechanism connected to an inflation seal ring disposed between the end cap and the end of the outer ring and secured to the end cap; an input end of the inflation mechanism extending into the positioning slot; and a seal disposed between the end of the outer ring remote from the end cap and the inner shaft. The process includes welding a protective cover, welding an extrusion ring, installing a gear ring, assembling the components, installing the end cap, connecting the end of the hose to the protective cover, and installing a filter. After the end cap is installed, the positioning plug-in mechanism engages with the positioning slot to provide positioning, thereby preventing the end cap from loosening.

Description

Technical Field

[0001] The invention relates to the field of wheel hub bearings, and in particular to a wheel hub bearing capable of preventing an end cover from loosening and a process thereof. Background Art

[0002] Wheel hub bearings are one of the key components of a car; they are mechanical components installed between the wheel and the axle. Their main function is to support the wheel load and enable the wheel to rotate freely relative to the axle.

[0003] It is crucial to install an end cover on the end of the outer ring of the hub bearing. The end cover can provide effective protection for the bearing, blocking the invasion of external dust, moisture and other impurities, thereby extending the service life of the bearing and ensuring its stable operation.

[0004] In traditional technology, the end cover is usually installed by snapping it directly onto the outer ring end of the wheel hub bearing. This installation method is relatively simple to operate; you only need to align the end cover with the outer ring end and apply a little force to snap it into place. However, the traditional snap-on installation method has obvious disadvantages. Due to the lack of positioning and limit design, the end cover is prone to shaking and offsetting after installation, resulting in insufficient installation stability. The use of more stable installation structures in the existing technology, such as bolt fixing, will make it inconvenient to disassemble and install the end cover. Each time the end cover is disassembled and installed, tools must be used to tighten or loosen the bolts. The operation process is relatively cumbersome, increasing maintenance time and costs. Summary of the Invention

[0005] In order to solve the technical problem that the end cover is easy to loosen and detach, the present invention provides a hub bearing and a process that can prevent the end cover from loosening.

[0006] The present invention solves the above technical problems through the following technical solutions:

[0007] The present invention provides a wheel hub bearing that can prevent the end cover from loosening, comprising an inner shaft and an outer ring sleeved on the inner shaft; steel balls and a retaining frame are arranged between the outer ring and the inner shaft; it also includes: an end cover, the end cover is fitted to one end of the outer ring, and a positioning slot is provided on the top outer wall and the bottom outer wall of the end cover; a positioning plug-in mechanism, the positioning plug-in mechanism is arranged at the end of the outer ring, and the positioning plug-in mechanism is plugged into the positioning slot; a gear ring, the gear ring is coaxially fixed with the end of the inner shaft, and the gear ring extends into the end cover, and the inner side of the bottom of the gear ring faces the sensor arranged in the end cover; a wiring port is arranged on the outside of the end cover; an inflation mechanism, the inflation mechanism is connected to an inflation sealing ring, the inflation sealing ring is arranged between the end cover and the end of the outer ring, and the inflation sealing ring is fixed to the end cover; the input end of the inflation mechanism extends into the positioning slot; a seal, a seal is arranged between the end of the outer ring away from the end cover and the inner shaft.

[0008] Preferably, the positioning and plug-in mechanism includes a movable ring and two plug-in parts; the two plug-in parts are respectively arranged at the top and bottom sides of the outer ring, and the two plug-in parts are both in contact with the inner wall of the movable ring, and a connecting rod is fixedly installed on one side of the movable ring, and the connecting rod is fixedly connected to a push plate, and the push plate is slidably connected to a guide hole opened on the outer ring, and a second spring is arranged in the guide hole, and the two ends of the second spring are respectively connected to the end face of the guide hole and the push plate wall.

[0009] Preferably, the plug-in portion includes a post and a wedge block fixedly mounted to one end of the post, the thickness of the wedge block gradually increases in the direction away from the guide hole, the top inner wall and the bottom inner wall of the movable ring are both provided with an inclined groove, the inclined groove is in contact with the top surface of the wedge block, the inner wall and the outer wall of the outer ring are respectively provided with a groove and a guide groove, the post passes through the guide groove and the groove, and the post is inserted into the positioning slot, a side seat is fixedly mounted on the side wall of the post, and the side seat and the groove wall are elastically connected by a third spring.

[0010] Preferably, the inflation mechanism includes a second cylinder; the second cylinder is fixedly mounted on the inner wall of the end cover, a second piston is cooperatively connected to the second cylinder, a second column is fixedly mounted on the second piston, and the second column extends into the positioning slot, a fourth spring is provided in the second cylinder, the two ends of the fourth spring are respectively abutted against the inner wall of the second cylinder and the second piston, the second cylinder is fixedly connected to a tube body, and one end of the tube body is fixedly connected to the inflation sealing ring.

[0011] Preferably, a protective cover is fixedly sleeved on the outer wall of one end of the outer ring away from the end cover, and the protective cover is connected to an air injection mechanism for inputting clean air flow into the protective cover.

[0012] Preferably, a flange is fixedly mounted on one end of the inner shaft away from the end cover, and bolts are provided on the flange; and a groove is formed between one side of the protective cover and a side wall of the flange.

[0013] Preferably, the gas injection mechanism includes two telescopic gas cylinders, which are symmetrically arranged inside the end cover. The air inlet end of the telescopic gas cylinder is connected to a filter through a second connecting pipe, and the filter is arranged on the outside of the end cover. The air outlet end of the telescopic gas cylinder is connected to a hose through a first connecting pipe, and the hose is connected to the protective cover.

[0014] Preferably, the telescopic air cylinder includes a first cylinder, a first piston is cooperatively connected to the first cylinder, an air cavity is formed between the inner wall of the first cylinder and the side wall of the first piston, a first spring is provided in the air cavity, a first one-way valve for air outlet and a second one-way valve for air intake are installed on the first cylinder; the first piston is fixedly connected to the first column, and a rolling ball is provided at the end of the first column.

[0015] Preferably, an extrusion ring is fixedly mounted on one end of the inner shaft, the thickness of the extrusion ring gradually increases from top to bottom, and the rolling ball on the telescopic air cylinder abuts against the extrusion ring.

[0016] The process comprises the following steps:

[0017] Step 1: Weld the protective cover on the end of the outer ring;

[0018] Step 2: Weld an extrusion ring to the end of the inner shaft and install an extended gear ring on the end of the inner shaft;

[0019] Step 3: Assemble the inner shaft, outer ring, steel balls, retainer and seal together;

[0020] Step 4: Manually install the end cap onto the end of the outer ring, and extend the gear ring into the sensor position inside the end cap;

[0021] Step 5: Connect the end of the hose to the interface on the protective cover;

[0022] Step 6: Install the filter on the end of the second connecting pipe extending outside the end cover.

[0023] On the basis of conforming to the common sense in this field, the above-mentioned preferred conditions can be arbitrarily combined to obtain the preferred embodiments of the present invention.

[0024] The positive progress effect of the present invention is:

[0025] The above-mentioned hub bearing and process that can prevent the end cover from loosening are proposed. A positioning slot is provided on the end cover, and a positioning plug-in mechanism is provided on the outer ring. After the end cover is installed, the positioning plug-in mechanism is plugged into the positioning slot to provide a positioning effect, thereby improving the stability of the end cover installation and facilitating the disassembly and assembly operation. The positioning plug-in mechanism and the positioning slot can be separated and plugged by pushing the movable ring on the positioning plug-in mechanism and loosening the movable ring. Furthermore, an inflatable sealing ring and an inflation mechanism are provided on the end cover. When the end cover is installed, the positioning plug-in mechanism is inserted into the positioning slot, and the input end of the inflation mechanism can be pushed to inflate the inflatable sealing ring, thereby ensuring the sealing effect between the end cover and the outer ring after the end cover is installed. Furthermore, a protective cover is added at the sealing position between the outer ring and the inner shaft, and an air injection mechanism is provided for inputting a clean air flow into the protective cover. The air injection mechanism injects a clean air flow into the protective cover, thereby reducing the possibility of dust entering the seal, and cooperating with the seal to improve the dustproof effect of the seal. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the overall structure of the hub bearing of the present invention.

[0027] Figure 2 It is a schematic diagram of the cross-sectional structure of the entire wheel hub bearing of the present invention.

[0028] Figure 3 For the present invention Figure 2 Schematic diagram of the structure with the A part in the middle enlarged.

[0029] Figure 4 It is a schematic diagram of the structure between the end cover and the outer ring of the present invention.

[0030] Figure 5 For the present invention Figure 4 Schematic diagram of the structure with the B part enlarged.

[0031] Figure 6 It is a structural schematic diagram of the inflation mechanism, positioning slot and inflation sealing ring of the present invention.

[0032] Figure 7 It is a structural schematic diagram of the gas injection mechanism and the extrusion ring of the present invention.

[0033] Figure 8 It is a structural schematic diagram of the gear ring and outer ring of the present invention.

[0034] Figure 9 Schematic diagram of the structure of the end cover of the present invention.

[0035] Figure 10 It is a structural schematic diagram of the movable ring and the bevel groove of the present invention.

[0036] Description of Reference Numerals

[0037] 1. Outer ring; 2. Mounting seat; 3. End cap; 301. Wiring port; 302. Positioning slot; 4. Flange; 5. Protective cover; 501. Intermediate groove; 6. Filter; 7. Hose; 8. Bolt; 9. Inner shaft; 10. Sensor; 11. Ring gear; 12. Gas injection mechanism; 1201. First cylinder; 1202. First piston; 1203. First column; 1204. Ball; 1205. First spring; 1206. First one-way valve; 1207. Second one-way valve; 1208. First connecting pipe; 1209. Second connecting pipe ; 13. Extrusion ring; 14. Positioning and plug-in mechanism; 1401. Movable ring; 14011. Bevel groove; 1402. Connecting rod; 1403. Push plate; 1404. Guide hole; 1405. Second spring; 1406. Wedge block; 1407. Groove; 1408. Insert column; 1409. Third spring; 1410. Side seat; 15. Inflatable sealing ring; 16. Seal; 17. Inflating mechanism; 1701. Tube body; 1702. Second cylinder; 1703. Fourth spring; 1704. Second piston; 1705. Second column. DETAILED DESCRIPTION

[0038] The present invention is further described below by way of examples, but the present invention is not limited to the scope of the examples.

[0039] like Figure 1-10 As shown, a hub bearing and process for preventing end caps from loosening include an inner shaft 9 and an outer ring 1 sleeved on the inner shaft 9; steel balls and a retainer are provided between the outer ring 1 and the inner shaft 9; and further include:

[0040] The end cover 3 is mounted on one end of the outer ring 1, and a positioning slot 302 is provided on the top and bottom outer walls of the end cover 3;

[0041] A positioning plug-in mechanism 14 is provided at the end of the outer ring 1 and is plugged into the positioning slot 302;

[0042] The ring gear 11 is coaxially fixed to the end of the inner shaft 9 and extends into the end cover 3. The inner side of the bottom of the ring gear 11 faces the sensor 10 disposed in the end cover 3. The outer side of the end cover 3 is provided with a wiring port 301.

[0043] The inflation mechanism 17 is connected to the inflation seal ring 15, which is arranged between the end cover 3 and the end of the outer ring 1 and is fixed to the end cover 3; the input end of the inflation mechanism 17 extends into the positioning slot 302;

[0044] A seal 16 is provided between the end of the outer ring 1 away from the end cover 3 and the inner shaft 9 .

[0045] like Figure 2 、 Figure 4 as well as Figure 5 As shown, as a specific technical solution, the positioning and plug-in mechanism 14 includes a movable ring 1401 and two plug-in parts; the two plug-in parts are respectively arranged at the top and bottom sides of the outer ring 1, and the two plug-in parts are both in contact with the inner wall of the movable ring 1401, and a connecting rod 1402 is fixedly installed on one side of the movable ring 1401, and the connecting rod 1402 is fixedly connected to a push plate 1403, and the push plate 1403 is slidably connected to a guide hole 1404 opened on the outer ring 1, and a second spring 1405 is arranged in the guide hole 1404, and the two ends of the second spring 1405 are respectively connected to the end face of the guide hole 1404 and the wall of the push plate 1403.

[0046] like Figure 5 as well as Figure 10As shown, as a specific technical solution, the plug-in portion includes a post 1408 and a wedge block 1406 fixedly installed to one end of the post 1408, the thickness of the wedge block 1406 gradually increases in the direction away from the guide hole 1404, the top inner wall and the bottom inner wall of the movable ring 1401 are both provided with a bevel groove 14011, the bevel groove 14011 is in contact with the top surface of the wedge block 1406, the inner wall and the outer wall of the outer ring 1 are respectively provided with a groove 1407 and a guide groove, the post 1408 passes through the guide groove and the groove 1407, and the post 1408 is inserted into the positioning slot 302, and a side seat 1410 is fixedly installed on the side wall of the post 1408, and the side seat 1410 is elastically connected to the wall of the groove 1407 by a third spring 1409.

[0047] The positioning and plug-in mechanism 14 facilitates removal and installation of the end cover 3 on the outer ring 1 .

[0048] like Figure 4 and Figure 5 As shown, at this time, the end cover 3 is in the installed state. When removing it, push the movable ring 1401 with one hand to make the movable ring 1401 approach the guide hole 1404. The movable ring 1401 drives the push plate 1403 to move through the connecting rod 1402. The push plate 1403 compresses the second spring 1405, causing it to produce compression deformation, and the movable ring 1401 moves to the wedge block 1406 close to one end of the guide hole 1404. The wedge block 1406 uses the elastic force of the third spring 1409 to move the side seat 1410, the plug post 1408 and the wedge block 1406 together. The top surface of the wedge block 1406 remains in contact with the wall of the inclined groove 14011, and the plug post 1408 is pulled out of the positioning slot 302, thereby releasing the positioning between the outer ring 1 and the end cover 3. Then move the end cover 3 to remove the end cover 3 from the outer ring 1 to complete the disassembly.

[0049] After the end cover 3 is removed, the internal components of the end cover 3 can be maintained and repaired; when the end cover 3 is installed, the movable ring 1401 is pushed through the above operation to keep the movable ring 1401 close to the guide hole 1404, and then the end of the end cover 3 is inserted into the port of the outer ring 1, and the two are matched. After matching, the positioning slot 302 is aligned with the plug post 1408, the movable ring 1401 is loosened, and the compression elastic force of the second spring 1405 is used to push the push plate 1403, and the push plate 1403 drives the movable ring 1401 to return to the position as shown in the figure. Figure 4-5 As shown in the position, the movable ring 1401 is reset and moved, and the top surface of the wedge block 1406 is squeezed and pushed by the inclined groove 14011, so that the wedge block 1406, the plug post 1408 and the side seat 1410 move together, and the third spring 1409 is stretched, and the plug post 1408 is inserted into the positioning slot 302 to achieve installation positioning.

[0050] The design of the end cover 3 being easy to disassemble and assemble provides convenience for the maintenance of the components inside the end cover 3.

[0051] like Figure 6 As shown, as a specific technical solution, the inflation mechanism 17 includes a second cylinder 1702; the second cylinder 1702 is fixedly mounted on the inner wall of the end cover 3, and a second piston 1704 is cooperatively connected to the second cylinder 1702, and a second column 1705 is fixedly mounted on the second piston 1704, and the second column 1705 extends into the positioning slot 302, and a fourth spring 1703 is provided in the second cylinder 1702, and the two ends of the fourth spring 1703 are respectively abutted against the inner wall of the second cylinder 1702 and the second piston 1704, and the second cylinder 1702 is fixedly connected to the tube body 1701, and one end of the tube body 1701 is fixedly connected to the inflation seal ring 15.

[0052] When the end cover 3 is installed, the plug 1408 is inserted into the positioning slot 302, and the plug 1408 pushes the second column 1705, so that the second piston 1704 squeezes and pushes the gas in the second cylinder 1702. The gas in the second cylinder 1702 enters the inflatable sealing ring 15 through the tube body 1701, causing the inflatable sealing ring 15 to expand, thereby increasing the sealing between the end cover 3 and the outer ring 1 after installation, thereby ensuring the protective effect of the end cover 3.

[0053] like Figure 1 and Figure 2 As shown, as a specific technical solution, a protective cover 5 is fixedly sleeved on the outer wall of the end of the outer ring 1 away from the end cover 3, and the protective cover 5 is connected to an air injection mechanism 12 for inputting clean air flow therein.

[0054] like Figure 3 As shown in the figure, as a specific technical solution, a flange 4 is fixedly mounted on the end of the inner shaft 9 away from the end cover 3, and bolts 8 are provided on the flange 4; a groove 501 is formed between one side of the protective cover and the side wall of the flange 4. A mounting seat 2 is fixedly mounted on the outer ring 1.

[0055] In the entire hub bearing, a seal is provided between the end of the outer ring 1 away from the end cover 3 and the inner shaft 9 through a seal 16 to prevent dust and water from entering between the outer ring 1 and the inner shaft 9; in order to further improve the protection effect, a protective cover 5 is provided to surround the position between the end of the outer ring 1 away from the end cover 3 and the inner shaft 9, and a groove 501 is reserved. The protective cover 5 is only fixed to the outer ring 1 and does not contact other components to avoid friction. At the same time, during operation, the air injection mechanism 12 injects clean air into the protective cover 5, and the air flow entering the protective cover 5 overflows from the four sides of the groove 501, thereby reducing the possibility of external dust entering through the groove 501, thereby improving the protection effect.

[0056] The above design improves the dustproof effect between the end of the outer ring 1 away from the end cover 3 and the inner shaft 9, making it suitable for long-term driving in dusty and muddy roads.

[0057] like Figure 4 and Figure 7 As shown, as a specific technical solution, the gas injection mechanism 12 includes two telescopic gas cylinders, which are symmetrically arranged inside the end cover 3. The air inlet end of the telescopic gas cylinder is connected to the filter 6 through the second connecting pipe 1209, and the filter 6 is arranged on the outside of the end cover 3. The air outlet end of the telescopic gas cylinder is connected to the hose 7 through the first connecting pipe 1208, and the hose 7 is connected to the protective cover 5.

[0058] like Figure 7 As shown, as a specific technical solution, the telescopic air cylinder includes a first cylinder 1201, a first piston 1202 is connected to the inside of the first cylinder 1201, an air cavity is formed between the inner wall of the first cylinder 1201 and the side wall of the first piston 1202, a first spring 1205 is provided in the air cavity, a first one-way valve 1206 for air outlet and a second one-way valve 1207 for air intake are installed on the first cylinder 1201; the first piston 1202 is fixedly connected to the first column 1203, and a rolling ball 1204 is provided at the end of the first column 1203.

[0059] like Figure 4 and Figure 7 As shown, as a specific technical solution, an extrusion ring 13 is fixedly installed at one end of the inner shaft 9, and the thickness of the extrusion ring 13 gradually increases from top to bottom. The rolling ball 1204 on the telescopic air cylinder abuts against the extrusion ring 13.

[0060] The air injection mechanism 12 injects air into the protective cover 5, and provides power through the relative rotation between the inner shaft 9 and the outer ring 1; specifically, when the inner shaft 9 and the outer ring 1 rotate relative to each other, the balls 1204 at the ends of the two telescopic air cylinders move on the extrusion ring 13, and the two telescopic air cylinders are symmetrically arranged, so that one telescopic air cylinder moves toward the thicker position of the extrusion ring 13, while the other telescopic air cylinder moves toward the thinner position of the extrusion ring 13; the ball 1204 on the telescopic air cylinder moving toward the thicker position of the extrusion ring 13 is squeezed, and the first piston 1202 is pushed to move through the first column 1203, and the volume of its air cavity is reduced, and the compression The first spring 1205 and the gas in the air cavity are transported through the first one-way valve 1206, the first connecting pipe 1208 and the hose 7 and enter the protective cover 5; the telescopic air cylinder moves toward the thinner position of the extrusion ring 13, and the first spring 1205 inside it releases the compressed elastic force, pushing the first piston 1202, the first cylinder 1203 and the ball 1204 to move together, so that the ball 1204 is always attached to the extrusion ring 13, and the volume of the air cavity is increased. After being filtered by the filter 6, the external air enters the air cavity through the second connecting pipe 1209 and the second one-way valve 1207, so that the air cavity is replenished with clean gas.

[0061] Through the above design, when the inner shaft 9 and the outer ring 1 rotate relative to each other, one telescopic air cylinder injects air into the protective cover 5, and the other telescopic air cylinder extracts external air and replenishes gas. The two telescopic air cylinders operate alternately to achieve continuous and uninterrupted air injection, and the air injection is carried out automatically without the need to set up an external power source.

[0062] The present invention also provides a hub bearing assembly process, which includes the following steps:

[0063] Step 1: Weld the protective cover 5 on the end of the outer ring 1;

[0064] Step 2: Weld the extrusion ring 13 to the end of the inner shaft 9 and install the extended gear ring 11 on the end of the inner shaft 9;

[0065] Step 3: Assemble the inner shaft 9, outer ring 1, steel balls, retainer and seal 16 together;

[0066] Step 4: Manually install the end cover 3 onto the end of the outer ring 1, and extend the ring gear 11 into the position of the sensor 10 in the end cover 3;

[0067] Step 5: Connect the end of the hose 7 to the interface on the protective cover 5;

[0068] Step six: install the filter 6 on the end of the second connecting pipe 1209 extending outside the end cover 3.

[0069] The present invention is not limited to the above-described embodiments. Any changes in shape or structure fall within the scope of protection of the present invention. The scope of protection of the present invention is defined by the appended claims. Those skilled in the art may make various changes or modifications to these embodiments without departing from the principles and essence of the present invention. Such changes and modifications shall fall within the scope of protection of the present invention.

Claims

1. A wheel hub bearing capable of preventing an end cover from loosening, comprising an inner shaft (9) and an outer ring (1) sleeved on the inner shaft (9); steel balls and a retaining frame are provided between the outer ring (1) and the inner shaft (9); characterized in that: Also includes: An end cover (3), the end cover (3) being mounted on one end of the outer ring (1), and having positioning slots (302) formed on both the top outer wall and the bottom outer wall of the end cover (3); A positioning plug-in mechanism (14), wherein the positioning plug-in mechanism (14) is arranged at the end of the outer ring (1), and the positioning plug-in mechanism (14) is plugged into the positioning slot (302); A gear ring (11), the gear ring (11) is coaxially fixed to the end of the inner shaft (9), and the gear ring (11) extends into the end cover (3), and the inner side of the bottom of the gear ring (11) faces the sensor (10) arranged in the end cover (3); An inflation mechanism (17), wherein the inflation mechanism (17) is connected to an inflation seal ring (15), the inflation seal ring (15) is arranged between the end cover (3) and the end of the outer ring (1), and the inflation seal ring (15) is fixed to the end cover (3); the input end of the inflation mechanism (17) extends into the positioning slot (302); A sealing member (16) is provided between the end of the outer ring (1) away from the end cover (3) and the inner shaft (9).

2. A hub bearing capable of preventing end caps from loosening according to claim 1, characterized in that: The positioning plug-in mechanism (14) includes a movable ring (1401) and two plug-in parts; the two plug-in parts are respectively arranged at the top side and the bottom side of the outer ring (1), and the two plug-in parts are both in contact with the inner wall of the movable ring (1401); a connecting rod (1402) is fixedly installed on one side of the movable ring (1401); the connecting rod (1402) is fixedly connected to a push plate (1403); the push plate (1403) is slidably connected to a guide hole (1404) provided on the outer ring (1); and a second spring (1405) is provided in the guide hole (1404); the two ends of the second spring (1405) are respectively connected to the end face of the guide hole (1404) and the wall of the push plate (1403).

3. A hub bearing capable of preventing end caps from loosening according to claim 2, characterized in that: The plug-in portion includes a plug post (1408) and a wedge block (1406) fixedly mounted to one end of the plug post (1408), the thickness of the wedge block (1406) gradually increases in a direction away from the guide hole (1404), the top inner wall and the bottom inner wall of the movable ring (1401) are both provided with an inclined groove (14011), the inclined groove (14011) is fitted with the top surface of the wedge block (1406), the inner wall and the outer wall of the outer ring (1) are respectively provided with a groove (1407) and a guide groove, the plug post (1408) passes through the guide groove and the groove (1407), and the plug post (1408) is inserted into the positioning slot (302), a side seat (1410) is fixedly mounted on the side wall of the plug post (1408), and the side seat (1410) is elastically connected to the wall of the groove (1407) by a third spring (1409).

4. A hub bearing capable of preventing end caps from loosening according to claim 1, characterized in that: The inflation mechanism (17) includes a second cylinder (1702); the second cylinder (1702) is fixedly mounted on the inner wall of the end cover (3); a second piston (1704) is cooperatively connected to the inside of the second cylinder (1702); a second column (1705) is fixedly mounted on the second piston (1704), and the second column (1705) extends into the positioning slot (302); a fourth spring (1703) is provided in the second cylinder (1702); two ends of the fourth spring (1703) are respectively in contact with the inner wall of the second cylinder (1702) and the second piston (1704); the second cylinder (1702) is fixedly connected to a tube (1701); one end of the tube (1701) is fixedly connected to the inflation seal ring (15).

5. A hub bearing capable of preventing end caps from loosening according to claim 1, characterized in that: A protective cover (5) is fixedly sleeved on the outer wall of one end of the outer ring (1) away from the end cover (3), and the protective cover (5) is connected to an air injection mechanism (12) for inputting clean air flow into the protective cover (5).

6. A hub bearing capable of preventing end caps from loosening according to claim 5, characterized in that: A flange (4) is fixedly mounted on one end of the inner shaft (9) away from the end cover (3), and bolts (8) are provided on the flange (4); a slot (501) is formed between one side of the protective cover and the side wall of the flange (4).

7. A hub bearing capable of preventing end caps from loosening according to claim 5, characterized in that: The gas injection mechanism (12) comprises two telescopic gas cylinders, which are symmetrically arranged inside the end cover (3). The gas inlet end of the telescopic gas cylinder is connected to a filter (6) via a second connecting pipe (1209), and the filter (6) is arranged outside the end cover (3). The gas outlet end of the telescopic gas cylinder is connected to a hose (7) via a first connecting pipe (1208), and the hose (7) is connected to the protective cover (5).

8. A hub bearing capable of preventing end caps from loosening according to claim 7, characterized in that: The telescopic air cylinder comprises a first cylinder (1201), a first piston (1202) being fitted and connected inside the first cylinder (1201), an air cavity being formed between the inner wall of the first cylinder (1201) and the side wall of the first piston (1202), a first spring (1205) being provided in the air cavity, a first one-way valve (1206) for air outlet and a second one-way valve (1207) for air intake being installed on the first cylinder (1201); the first piston (1202) being fixedly connected to a first column (1203), a rolling ball (1204) being provided at the end of the first column (1203).

9. A hub bearing capable of preventing end caps from loosening according to claim 8, characterized in that: An extrusion ring (13) is fixedly mounted on one end of the inner shaft (9), the thickness of the extrusion ring (13) gradually increasing from top to bottom, and the rolling ball (1204) on the telescopic air cylinder abuts against the extrusion ring (13).

10. A hub bearing assembly process for preventing the end cover from loosening according to any one of claims 1 to 9, characterized in that: The process comprises the following steps: Step 1: Welding a protective cover (5) onto the end of the outer ring (1); Step 2: welding an extrusion ring (13) to the end of the inner shaft (9), and installing an extended gear ring (11) on the end of the inner shaft (9); Step 3, assemble the inner shaft (9), outer ring (1), steel balls, retainer and seal (16) together; Step 4: manually install the end cover (3) onto the end of the outer ring (1), and the gear ring (11) extends to the position of the sensor (10) in the end cover (3); Step 5: Connect the end of the hose (7) to the interface on the protective cover (5); Step six: Install the filter (6) on the end of the second connecting pipe (1209) extending outside the end cover (3).

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