CN117072552B - Hub bearing - Google Patents

Abstract

The present invention relates to the technical field of vehicle transmission devices, and in particular, to a wheel hub bearing. The inner ring assembly includes a connected first inner ring unit and a flange unit. The outer ring component is sleeved on the outside of the first inner ring unit. The rolling assembly is disposed between the outer ring assembly and the first inner ring unit. The sealing component is arranged on one side of the rolling component. The first sealing unit of the sealing assembly includes a first frame and a first lip. The first frame includes a first supporting part, a first connecting part, and a first extending part that are connected in sequence. The first support part cooperates with the first inner ring unit. The first connecting portion extends from the first supporting portion toward the outer ring assembly. The first extending portion extends away from the flange unit. The first lip extends obliquely from the first extension. The second frame of the seal assembly cooperates with the outer ring assembly. The first lip is in contact with the second frame. The second lip portion of the sealing component is connected to the second frame and abuts against the first support portion. This solves the problem of incomplete dustproofing of the wheel hub bearing seal assembly.

Description

A wheel hub bearing

Technical field

The present invention relates to the technical field of vehicle transmission devices, and in particular, to a wheel hub bearing.

Background technique

The wheel hub is a component used to connect the tire and the transmission axle shaft. Its main movement method is to rotate around its own center, which will directly affect the comfort and safety of the vehicle. In order to make the wheel hub rotate smoothly and reduce torque loss during rotation, hub bearings can be installed in the wheel hub to reduce noise and improve comfort.

The wheel hub bearing is located at the bottom of the vehicle and has a short distance from the ground. During the driving of the vehicle, foreign matter from the ground may enter the wheel hub bearing. In order to prevent foreign matter from entering the wheel hub bearing, a sealing assembly can be provided at the end of the wheel hub bearing. When the hub bearing is running, the outer ring is fixed and the inner ring rotates. It is difficult for the sealing assembly to completely resist foreign objects without interfering with the rotation of the hub bearing.

Contents of the invention

In order to solve the problem of incomplete dustproofing of the sealing assembly of the wheel hub bearing, the present invention provides a wheel hub bearing, including:

Inner ring assembly, the inner ring assembly includes a first inner ring unit and a flange unit; one end of the first inner ring unit is fixedly connected to the flange unit;

An outer ring assembly, the outer ring assembly is sleeved on the outer peripheral side of the first inner ring unit;

A rolling assembly, the rolling assembly is arranged in the space surrounded by the outer ring assembly and the first inner ring unit;

a sealing component, the sealing component is arranged on the side of the rolling component close to the flange unit; the sealing component includes a first sealing unit and a second sealing unit; the first sealing unit includes a first skeleton, a third a lip; the first frame includes a first support part, a first connection part, and a first extension part; the first support part, the first connection part, and the first extension part are fixedly connected in sequence; The first support part has an interference fit with the outer circumferential surface of the first inner ring unit; the first connection part extends from an end of the first support part close to the flange unit toward away from the first inner ring unit. , the first connecting part is spaced apart from the flange unit; the first extension extends from one end of the first connecting part in a direction away from the flange unit; one end of the first lip is connected to the flange unit. The first extension part is fixedly connected, and the other end extends obliquely in a direction away from the first extension part and close to the flange unit; the second sealing unit includes a second frame and a second lip; the second The frame is in interference fit with the inner circumferential surface of the outer ring component; one end of the first lip away from the first extension is in contact with the second frame; one end of the second lip is in contact with the One end of the second frame is fixedly connected, and the other end extends in a direction close to the first support part and abuts against the first support part.

In some embodiments, the second frame includes a second support part and a second extension part; the second support part is an interference fit with the inner circumferential surface of the outer ring assembly; the second extension part extends from the One end of the second support portion away from the flange unit extends toward the first inner ring unit; the second lip portion includes a second connection portion and a sealing lip; the second connection portion extends from the first inner ring unit. One end of the two extension parts away from the second support part extends in a direction close to the first inner ring unit; the sealing lip extends from an end of the second connecting part away from the second extension part in a direction close to the first inner ring unit. The inner ring unit extends obliquely in a direction close to the flange unit, and the extended end of the sealing lip is in contact with the first support part.

In some embodiments, the distance between the side wall of the second connecting part away from the flange unit and the side wall of the flange unit is greater than the distance between an end of the first supporting part away from the flange unit and the flange unit. The distance between the side walls of the blue unit.

In some embodiments, the second lip further includes a mounting groove; the mounting groove is provided on a side of the sealing lip away from the first inner ring unit; the second sealing unit includes a constriction; The shrinkage part is sleeved in the installation groove and exerts shrinkage force on the sealing lip.

In some embodiments, the distance between the force-bearing point where the contraction part exerts the contraction force and the side wall of the flange unit is greater than the distance between the point where the sealing lip abuts the first support part and the side wall of the flange unit. distance.

In some embodiments, the second sealing unit further includes a first protruding portion; the first protruding portion extends from an end of the second extending portion away from the second supporting portion toward a direction closer to the rolling assembly. Extension; the distance between the extended end of the first protrusion and the side wall of the flange unit is greater than the distance between the end of the first support part away from the flange unit and the side wall of the flange unit.

In some embodiments, the distance between the extended end of the first protrusion and the rolling component is 0.3mm-0.5mm.

In some embodiments, the second sealing unit further includes a second protruding portion; the second protruding portion extends from a side of the second extension portion away from the flange unit toward a direction closer to the rolling assembly. Extend; the second raised portion is disposed in the space between the first raised portion and the outer ring assembly; the distance between the extended end of the second raised portion and the side wall of the flange unit is greater than The distance between the extended end of the first protrusion and the side wall of the flange unit.

In some embodiments, the second sealing unit further includes a first dust-proof portion; the first dust-proof portion extends from a side of the second extension portion close to the flange unit toward the first extension portion. The extension end of the first dust-proof part is spaced apart from the first extension part; the first dust-proof part is spaced apart from the sealing lip.

In some embodiments, the second frame further includes a third extension portion; the third extension portion extends from an end of the second support portion away from the second extension portion in a direction away from the first inner ring unit. Extend; the side wall of the third extension portion abuts the end surface of the outer ring assembly; the second sealing unit also includes a second dust-proof portion; the second dust-proof portion is away from the third extension portion One end of the second support part extends toward the flange unit, and the extended end of the second dust-proof part is spaced apart from the flange unit.

In order to solve the problem of incomplete dustproofing of the wheel hub bearing seal assembly, the present invention has the following advantages:

The sealing component can be located on the side of the rolling component to prevent foreign matter from entering the wheel hub bearing. It may include a first sealing unit and a second sealing unit. The first sealing unit may include a first frame and a first lip. The first frame may include a first supporting part, a first connecting part, and a first extending part that are fixedly connected in sequence. The first support part can tightly fix the first frame to the outer peripheral surface of the first inner ring unit to provide stable support. The first connection part is spaced apart from the flange unit. Even if foreign matter enters, the separation space can allow the foreign matter to have buffer space and allow the foreign matter to be temporarily stored in the separation space without direct contact with the rolling components to avoid affecting the operation of the bearing unit. . One end of the first extension part can be fixedly connected to one end of the first connecting part, and the other end extends obliquely. The fixed connection method can be vulcanization processing. The second sealing unit may include a second frame and a second lip. The second frame can tightly fix the second frame on the inner peripheral surface of the outer ring assembly. When foreign matter passes through the blocking of the first lip, the second lip can further prevent the foreign matter from directly entering the inside of the bearing unit.

Description of drawings

Figure 1 shows a schematic diagram of a wheel hub bearing according to an embodiment;

Figure 2 shows a schematic diagram of a wheel hub bearing in another embodiment.

Reference signs: 01 inner ring assembly; 11 first inner ring unit; 111 first inner ring raceway; 112 first mounting part; 12 second inner ring unit; 121 second inner ring raceway; 122 second mounting part ;13 flange unit; 131 flange plate; 132 first side wall; 14 spline unit; 02 outer ring assembly; 21 outer ring body; 22 first outer ring raceway; 23 second outer ring raceway; 24th Three mounting parts; 25 fourth mounting parts; 03 rolling components; 31 first row of balls; 32 first cage; 33 second row of balls; 34 second cage; 35 first rolling accommodation area; 36 second rolling accommodation Area; 37 third rolling accommodation area; 04 sealing assembly; 41 first sealing unit; 411 first frame; 4111 first support part; 4112 first connection part; 4113 first extension part; 412 first lip part; 42 Two sealing units; 421 second frame; 4211 second support part; 4212 second extension part; 4213 third extension part; 422 first dustproof part; 423 second dustproof part; 424 second lip part; 4241 second Connection part; 4242 sealing lip; 4243 mounting groove; 425 first protruding part; 426 second protruding part; 427 constriction part.

Detailed ways

The present disclosure will now be discussed with reference to several exemplary embodiments. It should be understood that these embodiments are discussed merely to enable those of ordinary skill in the art to better understand and thereby implement the contents of the disclosure, and are not intended to imply any limitation on the scope of the disclosure.

As used herein, the term "includes" and variations thereof are to be read as an open-ended term meaning "including, but not limited to." The term "based on" is to be read as "based at least in part on." The terms "one embodiment" and "an embodiment" are to be read as "at least one embodiment." The term "another embodiment" is to be read as "at least one other embodiment." The terms "upper", "lower", "left", "right", "front", "back", "top", "bottom", "inner", "outer", "vertical", "horizontal", The orientation or positional relationship indicated by "horizontal", "vertical", etc. is based on the orientation or positional relationship shown in the drawings. These terms are mainly used to better describe the present application and its embodiments and are not intended to limit the indicated device, element or component to having a specific orientation, or to be constructed and operated in a specific orientation. Moreover, some of the above terms may also be used to express other meanings in addition to indicating orientation or positional relationships. For example, the term "upper" may also be used to express a certain dependence relationship 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 specific circumstances. In addition, the terms "mounted," "set," "provided," "connected," and "connected" are to be construed broadly. 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 between two devices, components or components. internal connectivity. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances. In addition, the terms "first", "second", etc. are mainly used to distinguish different devices, components or components (the specific types and structures may be the same or different), and are not used to indicate or imply that the indicated devices, components or the relative importance and number of components. Unless otherwise stated, "plurality" means two or more.

This embodiment discloses a wheel hub bearing, as shown in Figures 1 and 2, which may include:

Inner ring assembly 01. The inner ring assembly 01 includes a first inner ring unit 11 and a flange unit 13; one end of the first inner ring unit 11 is fixedly connected to the flange unit 13;

The outer ring assembly 02 is sleeved on the outer peripheral side of the first inner ring unit 11;

The rolling assembly 03 is arranged in the space surrounded by the outer ring assembly 02 and the first inner ring unit 11;

The sealing assembly 04 is provided on the side of the rolling assembly 03 close to the flange unit 13; the sealing assembly 04 includes a first sealing unit 41 and a second sealing unit 42; the first sealing unit 41 includes a first frame 411, a first Lip 412; the first frame 411 includes a first supporting part 4111, a first connecting part 4112, and a first extending part 4113; the first supporting part 4111, the first connecting part 4112, and the first extending part 4113 are fixedly connected in sequence; the first The support part 4111 is an interference fit with the outer circumferential surface of the first inner ring unit 11; the first connection part 4112 extends from the end of the first support part 4111 close to the flange unit 13 toward away from the first inner ring unit 11, and the first connection part 4112 and The flange units 13 are arranged at intervals; the first extension portion 4113 extends from one end of the first connecting portion 4112 in a direction away from the flange unit 13; one end of the first lip portion 412 is fixedly connected to the first extension portion 4113, and the other end faces away from the first extension portion 4113. The extension portion 4113 extends obliquely in a direction close to the flange unit 13; the second sealing unit 42 includes a second frame 421 and a second lip 424; the second frame 421 has an interference fit with the inner circumferential surface of the outer ring assembly 02; the first One end of the lip 412 away from the first extension part 4113 is in contact with the second frame 421; one end of the second lip 424 is fixedly connected to one end of the second frame 421, and the other end extends in a direction close to the first support part 4111 and is connected with the second frame 421. A support part 4111 is in contact.

In this embodiment, the wheel hub is a component located between the tire and the transmission half-shaft. The wheel hub, tire, and transmission half-shaft rotate synchronously, which can transmit torque from the transmission half-shaft to the tire, allowing the tire to roll relative to the ground, causing The vehicle is moving. In order to reduce vibration, noise and improve stability of the wheel hub during operation, hub bearings can be installed in the wheel hub. Since the wheel hub bearing is located at the bottom of the vehicle chassis and has a short distance from the ground, foreign matter will enter the wheel hub bearing when the vehicle is driving, affecting the rolling of the rolling component 03 of the wheel hub bearing, resulting in abnormal wheel hub wear, jamming, etc., which will directly affect to vehicle safety. It can be seen that setting the sealing assembly 04 at the side end of the rolling assembly 03 is one of the essential measures. As shown in Figures 1 and 2, the hub bearing may include an inner ring assembly 01, an outer ring assembly 02, a rolling assembly 03, and a sealing assembly 04. The outer ring component 02 can be sleeved on the outside of the inner ring component 01 , a rolling component 03 can be embedded between the inner ring component 01 and the outer ring component 02 , and a sealing component 04 can be provided on the side of the rolling component 03 .

The inner ring assembly 01 may include a first inner ring unit 11 and a flange unit 13 . One end of the first inner ring unit 11 can be fixedly connected to the flange unit 13 and integrally formed, which can improve the strength of the inner ring assembly 01 and reduce the processing steps of the inner ring assembly 01 to achieve the purpose of improving production efficiency.

The inner circumferential surface of the outer ring assembly 02 can be sleeved on the outer circumferential surface of the first inner ring unit 11 , and the inner circumferential surface of the outer ring assembly 02 can be spaced apart from the outer circumferential surface of the first inner ring unit 11 . The rolling component 03 can be embedded in the space. The rolling assembly 03 can roll and rub against each other with the outer ring assembly 02 and the inner ring assembly 01, which can reduce the friction resistance when the hub bearing rotates and make the hub bearing run smoothly.

Both ends of the sealing assembly 04 can be in contact with the inner circumferential surface of the outer ring assembly 02 and the outer circumferential surface of the first inner ring unit 11 respectively, and are arranged on the side of the rolling assembly 03 close to the flange unit 13, which can prevent foreign matter from directly contacting the flange unit 13. The rolling components 03 are in contact to ensure the smooth operation of the bearing unit. The sealing assembly 04 may include a first sealing unit 41 and a second sealing unit 42 . The first sealing unit 41 and the second sealing unit 42 may abut against each other to form a seal. When the first sealing unit 41 cannot completely prevent foreign matter from entering due to aging or other reasons, the foreign matter can be temporarily stored in the sealing cavity and then be discharged with the rotation of the bearing unit. This way of arranging two sealing units at the same time can further increase the protection capability of the sealing assembly 04. The first sealing unit 41 may include a first frame 411 and a first lip 412 . The first frame 411 can be bent into a C-shape (as shown in Figure 2) from a plate, and can include a first support portion 4111, a first connecting portion 4112, and a first extension portion 4113 that are fixedly connected in sequence, which can facilitate processing and improvement. The strength of the first skeleton 411. The first support part 4111 can be interference-fitted with the outer peripheral surface of the first inner ring unit 11, and the first support part 4111 can be fixed without using additional connecting components, thereby achieving a lightweight effect. One end of the first connecting portion 4112 can be fixedly connected to an end of the first supporting portion 4111 close to the flange unit 13 , and the other end of the first connecting portion 4112 can extend in a direction close to the inner peripheral surface of the outer ring assembly 02 , and the extending direction can be It is vertical or slightly inclined relative to the first supporting part 4111. The first connection part 4112 can be spaced apart from the side of the flange unit 13 close to the first support part 4111. When foreign matter enters the wheel hub bearing, the separation space can provide a buffer for the foreign matter and temporarily store the foreign matter in the separation space to prevent the foreign matter from directly contacting the rolling wheel. Component 03 is in contact to ensure smooth operation of the wheel hub bearing. One end of the first extension part 4113 may be fixedly connected to an end of the first connecting part 4112 close to the inner circumferential surface of the outer ring assembly 02 , and the other end of the first extension part 4113 may extend away from the flange unit 13 . One end of the first lip 412 can be fixedly connected to a side of the first extension 4113 close to the inner circumferential surface of the outer ring assembly 02. The fixed connection can be a vulcanization process. In this way, the first lip 412 can be connected to the first extension. Part 4113 is connected stably. The other end of the first lip 412 may extend in a direction close to the inner peripheral surface of the outer ring assembly 02 and be inclined in a direction close to the flange unit 13 . The second sealing unit 42 may include a second frame 421 and a second lip 424 . The second frame 421 may be in interference fit with the inner peripheral surface of the outer ring assembly 02 . In this way, the outer ring assembly 02 and the second frame 421 can be firmly matched without using additional connecting components. The end of the first lip 412 close to the inner circumferential surface of the outer ring assembly 02 can be in contact with the side of the second frame 421 away from the inner circumferential surface of the outer ring assembly 02 . The first lip 412 will produce a certain deformation when abutting. Under the action of the rebound force, the first lip 412 can generate a certain pressure on the second frame 421, which can make the sealing between the first lip 412 and the second frame 421 better. close. When foreign matter enters from the gap between the flange unit 13 and the outer ring assembly 02, the first lip 412 and the second frame 421 can reduce the entry of foreign matter into the interior of the bearing unit, thereby extending the service life of the bearing hub. One end of the second lip 424 may be fixedly connected to an end of the second frame 421 away from the outer ring assembly 02 . The fixed connection method can be a vulcanization process, so that the second lip 424 and the second frame 421 can be firmly connected. The other end of the second lip 424 may extend in a direction close to the outer peripheral surface of the first inner ring unit 11 and abut with the side of the first support part 4111 away from the first inner ring unit 11 . The second lip 424 will deform to a certain extent when abutting, and the resilience of the second lip 424 can make the sealing between the second lip 424 and the second frame 421 tighter. When the first lip 412 ages, it is easy to cause a gap between the first lip 412 and the second support part 4211. Some foreign objects may pass through the gap between the first lip 412 and the second frame 421 when the vehicle is running. Enter, the direction in which the second lip 424 extends obliquely can make it easier for the second lip 424 to be pressed toward the first support part 4111 by its own elastic force, so that the contact area between the second lip 424 and the first support part 4111 is larger. It more stably prevents foreign matter from entering the inside of the bearing unit and ensures the smooth operation of the bearing unit, thereby improving the comfort and safety of the vehicle.

In other embodiments, the inner ring assembly 01 may also include a second inner ring unit 12 . The second inner ring unit 12 can be detachably connected to the end of the first inner ring unit 11 away from the flange unit 13. In this way, the first inner ring unit 11 and the second inner ring unit 12 can be replaced respectively according to the different wear degrees of the first inner ring unit 11 and the second inner ring unit 12. . The second inner ring unit 12 may include a second inner ring raceway 121 and a second mounting part 122 . The second inner ring raceway 121 can be provided at one end of the second inner ring unit 12 close to the flange unit 13, and can be used to accommodate the rolling assembly 03 and have rolling friction with the rolling assembly 03. The second mounting portion 122 can be provided at an end of the second inner ring unit 12 away from the flange unit 13, and the sealing assembly 04 can be fixed there according to usage requirements. The first inner ring unit 11 of the inner ring assembly 01 may include a first inner ring raceway 111 and a first mounting part 112 . The first inner ring raceway 111 can be provided on the side of the first inner ring unit 11 close to the outer ring assembly 02 and can be used to accommodate the rolling assembly 03 . The first mounting portion 112 may be provided on a side of the first inner ring unit 11 close to the outer ring assembly 02 and close to the flange unit 13 , and may be used to fix the axial position of the sealing assembly 04 .

The flange unit 13 may include a flange plate 131 , a first side wall 132 , and a spline unit 14 . The flange plate 131 can be provided at an end of the flange unit 13 away from the outer ring assembly 02, and can be a disc with a number of threaded holes along the axial direction, and can be connected to the vehicle through bolts to drive the wheel rotation. The first side wall 132 may be provided on a side of the flange 131 close to the outer ring assembly 02 . The spline unit 14 can penetrate the center of the flange unit 13 in the axial direction, can cooperate with the spline of the drive half shaft (omitted in the figure), and can transmit torque.

The outer ring assembly 02 may include an outer ring body 21 , a first outer ring raceway 22 , a second outer ring raceway 23 , a third mounting part 24 , and a fourth mounting part 25 . The outer ring body 21 can be a ring-shaped object, which can be placed outside the inner ring assembly 01 and spaced apart from the inner ring assembly 01 . The first outer ring raceway 22 can be disposed on the outer ring body 21 close to the side wall of the inner ring assembly 01 and close to the flange unit 13 , and the second outer ring raceway 23 can be disposed on the outer ring body 21 close to the inner ring assembly 01 side wall and away from the flange unit 13. The first outer ring raceway 22 and the second outer ring raceway 23 can be arranged at intervals and correspond to the first inner ring raceway 111 and the second inner ring raceway 121, and the rolling assembly 03 is embedded therein. The third mounting part 24 may be provided at an end of the outer ring body 21 away from the flange unit 13 , and the fourth mounting part 25 may be provided at an end of the outer ring body 21 close to the flange unit 13 . The third mounting part 24 and the fourth mounting part 25 can be used to install the seal assembly 04 and fix the axial position of the seal assembly 04.

The rolling assembly 03 may include a first row of balls 31 , a first cage 32 , a second row of balls 33 , a second cage 34 , a first rolling accommodation area 35 , a second rolling accommodation area 36 , and a third rolling accommodation area 37 . The first row of balls 31 can be embedded between the first inner ring raceway 111 and the first outer ring raceway 22 , so that the first row of balls 31 is connected to the first inner ring raceway 111 and the first outer ring raceway 22 . The friction type is rolling friction, which can improve the smooth rotation of the wheel hub bearing. The second row of balls 33 can be embedded between the second inner ring raceway 121 and the second outer ring raceway 23 , so that the second row of balls 33 is connected to the second inner ring raceway 121 and the second outer ring raceway 23 . The type of friction is rolling friction. Rolling friction can reduce the friction resistance between adjacent friction parts, reduce torque loss, and improve the smooth rotation of the wheel hub bearing. The first cage 32 can be disposed at intervals between the first inner ring raceway 111 and the first outer ring raceway 22 to prevent the adjacent first row of balls 31 from colliding with each other and to avoid abnormality in the first row of balls 31 Wear and reduce the noise when the bearing hub is running. The second cage 34 is spaced between the second inner ring raceway 121 and the second outer ring raceway 23 to prevent the adjacent second row of balls 33 from colliding with each other and avoid abnormal wear of the second row of balls 33 , Prevent wheel hub bearings from getting stuck. The first row of balls 31 and the second row of balls 33, the outer ring assembly 02, and the first inner ring unit 11 can surround and form a first rolling accommodation area 35. The first row of balls 31, sealing assembly 04, fourth mounting part 25, and A mounting part 112 may surround and form the second rolling receiving area 36 , and the second row of balls 33 , another sealing device, the third mounting part 24 and the second mounting part 122 may surround and form the third rolling receiving area 37 . During the assembly process of the wheel hub bearing, lubricant can be injected into the first rolling accommodation area 35, the second rolling accommodation area 36, and the third rolling accommodation area 37, which can reduce the vibration and noise of the wheel hub bearing during operation and ensure the durability of the wheel hub bearing. Stable job.

In some embodiments, as shown in Figures 1 and 2, the second frame 421 includes a second support part 4211 and a second extension part 4212; the second support part 4211 is an interference fit with the inner circumferential surface of the outer ring assembly 02; The second extension part 4212 extends from the end of the second support part 4211 away from the flange unit 13 toward the first inner ring unit 11; the second lip part 424 includes a second connection part 4241 and a sealing lip 4242; the second connection part 4241 The sealing lip 4242 extends from the end of the second extension part 4212 away from the second support part 4211 toward the first inner ring unit 11 ; the sealing lip 4242 extends from the end of the second connecting part 4241 away from the second extension part 4212 toward the first inner ring unit 11 And it extends obliquely in the direction close to the flange unit 13 , and the extended end of the sealing lip 4242 is in contact with the first support part 4111 .

In this embodiment, as shown in FIGS. 1 and 2 , the second frame 421 may include a second support part 4211 and a second extension part 4212 . The second support part 4211 can be interference-fitted with the inner circumferential surface of the outer ring component 02, and the second support part 4211 can be firmly connected to the inner circumferential surface of the outer ring component 02 without using additional connecting components, thereby achieving lightweight design. purpose and reduce assembly steps, which can reduce production costs. One end of the second extension part 4212 may be connected to an end of the second support part 4211 away from the flange unit 13 , and the other end of the second extension part 4212 may extend in a direction close to the first inner ring unit 11 . The second lip part 424 may include a second connecting part 4241 and a sealing lip 4242. One end of the second connecting portion 4241 can extend with the second extension portion 4212 in a direction close to the first inner ring unit 11 , and the other end of the second connecting portion 4241 can extend in a direction away from the outer ring assembly 02 . One end of the sealing lip 4242 may be connected to an end close to the first inner ring unit 11 from the second connecting portion 4241 . The other end of the sealing lip 4242 can extend away from the outer ring assembly 02 and be inclined toward the first connecting portion 4112 . This end can abut with the side of the first support portion 4111 away from the first inner ring unit 11 . The sealing lip 4242 can be made of rubber material. When the sealing lip 4242 contacts the first support portion 4111, the sealing lip 4242 can deform due to the characteristics of the material. The sealing lip 4242 can produce a force on the first support portion 4111 under the action of resilience. pressure. The inclination of the sealing lip 4242 can make itself an inverted triangle, making it easier to deform, increasing the pressure of the sealing lip 4242 on the first support part 4111, making the seal formed by the sealing lip 4242 and the first support part 4111 stronger, and improving dust prevention. ability. When a gap is formed between the first lip 412 and the second support part 4211 due to aging and other reasons, and foreign matter enters from the contact between the first lip 412 and the second support part 4211, the sealing lip 4242 and the first support part 4111 can prevent foreign matter from contacting the rolling assembly 03, which can extend the service life of the wheel hub bearing. Lubricant can be provided on the left area (as shown in Figure 2) of the sealing lip 4242 and the first support portion 4111. This method can also prevent the lubricant from coming from the contact point between the sealing lip 4242 and the first support portion 4111. Further reduce the torque loss during wheel hub bearing operation.

In some embodiments, as shown in FIGS. 1 and 2 , the distance between the side wall of the second connecting portion 4241 away from the flange unit 13 and the side wall of the flange unit 13 is greater than the distance between the end of the first support portion 4111 away from the flange unit 13 distance from the side wall of the flange unit 13.

In this embodiment, as shown in Figures 1 and 2, during the rotation of the hub bearing, the lubricant inside the hub bearing can be thrown to the side wall of the second connecting part 4241 away from the first connecting part 4112 by the centrifugal force generated by the rotation. superior. The distance between the side wall of the second connecting part 4241 away from the first connecting part 4112 and the side wall of the flange unit 13 is greater than the distance between the end of the first supporting part 4111 away from the first connecting part 4112 and the side wall of the flange unit 13 . This arrangement prevents the lubricant on the side wall of the first connecting part 4112 from moving to the first supporting part 4111 when moving along the side wall of the first connecting part 4112, and avoids the lubricant on the first supporting part 4111 The accumulation of lubricant at the contact point with the sealing lip 4242 allows the lubricant to continue to participate in the lubrication work of the wheel hub bearing, and reduces the probability of lubricant seeping out from the contact point between the first support portion 4111 and the sealing lip 4242, thus ensuring the smooth operation of the wheel hub bearing. Rotate.

In some embodiments, as shown in Figures 1 and 2, the second lip 424 also includes a mounting groove 4243; the mounting groove 4243 is provided on the side of the sealing lip 4242 away from the first inner ring unit 11; the second sealing unit 42 It includes a shrinking part 427; the shrinking part 427 is sleeved in the installation groove 4243 and exerts a shrinking force on the sealing lip 4242.

In this embodiment, as shown in FIGS. 1 and 2 , the second lip 424 may further include a mounting groove 4243 . The mounting groove 4243 may be provided on a side of the sealing lip 4242 away from the first support part 4111 . The second sealing unit 42 may include a shrinking part 427, and the shrinking part 427 may be a rubber elastic ring or a shrinking ring. When the wheel hub bearing speed is low and the vehicle where the wheel hub bearing is installed is mostly used on paved roads, rubber elastic rings can be used, which can reduce costs while ensuring shrinkage force. When the wheel hub speed is high and the vehicle where the wheel hub bearing is installed is mostly used on non-paved roads, a shrink ring can be used. The shrinking portion 427 can be sleeved in the installation groove 4243 to exert a shrinking force on the sealing lip 4242, which can make the sealing lip 4242 and the first support portion 4111 more closely contact, and stably prevent the loss of lubricant and the entry of foreign matter.

In some embodiments, as shown in FIGS. 1 and 2 , the distance between the force-bearing point where the contraction part 427 exerts the contraction force and the side wall of the flange unit 13 is greater than the distance between the point where the sealing lip 4242 abuts the first support part 4111 and the flange unit 13 . 13 side wall distance.

In this embodiment, as shown in FIGS. 1 and 2 , the distance between the force-receiving point where the contraction part 427 exerts the contraction force and the side wall of the first support part 4111 may be greater than the distance between the contact point between the sealing lip 4242 and the first support part 4111 and the side wall of the first support part 4111 . A distance from the side wall of the support part 4111. When the sealing lip 4242 contacts the first support part 4111, this method can make the contact area between the sealing lip 4242 and the first support part 4111 larger, which can further prevent the loss of lubricant and the entry of foreign matter, and can make the wheel hub The operation of the bearing is more stable.

In some embodiments, as shown in FIGS. 1 and 2 , the second sealing unit 42 further includes a first protruding portion 425 ; the first protruding portion 425 approaches from the end of the second extending portion 4212 away from the second supporting portion 4211 . The rolling assembly 03 extends in the direction; the distance between the extended end of the first protrusion 425 and the side wall of the flange unit 13 is greater than the distance between the end of the first support part 4111 away from the flange unit 13 and the side wall of the flange unit 13 .

In this embodiment, as shown in FIGS. 1 and 2 , the second sealing unit 42 may further include a first protrusion 425 . One end of the first protruding part 425 may be connected to an end away from the first connecting part 4112 from the second extending part 4212, and the other end of the first protruding part 425 may extend in a direction away from the first connecting part 4112. The distance between the extended end of the first protruding part 425 and the side wall of the first connecting part 4112 may be greater than the distance between the end of the first supporting part 4111 away from the first connecting part 4112 and the side wall of the first connecting part 4112. In this way, when the lubricant is thrown to the side wall of the second extension part 4212 away from the first connection part 4112 by the centrifugal force generated by the rotation of the hub bearing, the lubricant moves along the side wall of the second extension part 4212 away from the first connection part 4112, The first protruding portion 425 can reduce the movement of lubricant to the contact point between the first support portion 4111 and the sealing lip 4242, and can prevent the lubricant from accumulating at the contact point between the first support portion 4111 and the sealing lip 4242, thereby allowing the lubricant to Participate in the lubrication of the wheel hub bearing to make the wheel hub bearing rotate smoothly.

In some embodiments, as shown in FIGS. 1 and 2 , the distance between the extended end of the first protrusion 425 and the rolling component 03 is 0.3mm-0.5mm.

In this embodiment, as shown in FIGS. 1 and 2 , the distance between the end of the first protrusion 425 away from the first support part 4111 and the rolling assembly 03 is 0.3 mm to 0.5 mm. When the lubricating oil moves along the side wall of the second extension part 4212 away from the first support part 4111 to the side wall of the first protruding part 425 close to the second support part 4211, and then moves to the first protruding part 425 away from the first support part At one end of 4111, this small spacing arrangement allows the lubricant to be adsorbed to the surface of the rolling component 03 and directly participate in lubrication, which can effectively improve the smoothness of the wheel hub bearing rotation and reduce the loss of lubricant.

In some embodiments, as shown in FIGS. 1 and 2 , the second sealing unit 42 further includes a second protruding portion 426 ; the second protruding portion 426 faces from the side of the second extension portion 4212 away from the flange unit 13 . Extending in the direction close to the rolling assembly 03; the second protruding portion 426 is disposed in the space between the first protruding portion 425 and the outer ring assembly 02; the distance between the extended end of the second protruding portion 426 and the side wall of the flange unit 13 is greater than The distance between the extending end of the first protrusion 425 and the side wall of the flange unit 13 .

In this embodiment, as shown in FIGS. 1 and 2 , the second sealing unit 42 may further include a second protruding portion 426 . One end of the second protruding part 426 may be connected to an end away from the first connecting part 4112 from the second extending part 4212, and the other end of the second protruding part 426 may extend in a direction away from the first connecting part 4112. The second raised portion 426 may be disposed in the space between the first raised portion 425 and the outer ring assembly 02 . The distance between the extended end of the second protrusion 426 and the side wall of the first connection part 4112 may be greater than the distance between the end of the second protrusion 426 away from the first connection part 4112 and the side wall of the first connection part 4112, and the second protrusion The extended end of the portion 426 may be located within the radial projection area of the rolling assembly 03 . When the lubricant is thrown to the side wall of the second supporting part 4211 away from the first connecting part 4112 by the centrifugal force generated by the rotation of the hub bearing, the lubricant moves along this side wall to the side wall of the second protruding part 426 close to the second supporting part 4211 , and then move to the end of the second protruding portion 426 away from the first supporting portion 4111, the lubricant can directly drip onto the surface of the rolling component 03 to participate in lubrication, which can make the wheel hub bearing run smoothly.

In some embodiments, as shown in FIGS. 1 and 2 , the second sealing unit 42 further includes a first dust-proof part 422 ; the first dust-proof part 422 faces from the side of the second extension part 4212 close to the flange unit 13 . It extends obliquely in a direction close to the first extension part 4113; the extension end of the first dust-proof part 422 is spaced apart from the first extension part 4113; the first dust-proof part 422 is spaced apart from the sealing lip 4242.

In this embodiment, as shown in FIGS. 1 and 2 , the second sealing unit 42 may further include a first dust-proof part 422 . One end of the first dust-proof part 422 can be connected to a side of the second extension part 4212 close to the first support part 4111, and the other end of the first dust-proof part 422 can extend in a direction close to the first support part 4111. It can be inclined in a direction close to the second support portion 4211 and spaced apart from the first extension portion 4113 . The inclined extension end of the first dust-proof part 422 may be arranged at a small distance from the first extension part 4113 . This structure allows a pocket opening toward the second extension 4212 to be formed between the dustproof portion and the second extension 4212 . When a gap is formed between the first lip portion 412 and the second support portion 4211 due to aging or other reasons, and foreign matter enters through the gap, the pocket between the dust-proof portion and the second extension portion 4212 can provide a buffer space for the foreign matter. Foreign matter is temporarily stored in the pocket. The small distance between the inclined extension end of the first dust-proof part 422 and the first extension part 4113 can reduce the further penetration of foreign matter without affecting the rotation of the wheel hub bearing, allowing the foreign matter to follow the rotation of the wheel hub bearing. The rotation is discharged from the contact point between the first lip 412 and the second support part 4211 . And due to the specific extending and tilting direction of the first lip 412, it can form a trumpet shape with the opening facing the left (as shown in FIG. 2), making it difficult for foreign objects to enter and exit easily.

In some embodiments, as shown in FIGS. 1 and 2 , the second frame 421 further includes a third extension part 4213 ; the third extension part 4213 extends from an end of the second support part 4211 away from the second extension part 4212 toward the The inner ring unit 11 extends in the direction; the side wall of the third extension part 4213 contacts the end surface of the outer ring assembly 02; the second sealing unit 42 also includes a second dust-proof part 423; the second dust-proof part 423 extends from the third extension part 4213 One end away from the second supporting part 4211 extends toward the flange unit 13 , and the extended end of the second dust-proof part 423 is spaced apart from the flange unit 13 .

In this embodiment, as shown in FIGS. 1 and 2 , the second frame 421 may also include a third extension part 4213 . One end of the third extension part 4213 is connected to an end of the second support part 4211 away from the first support part 4111. The other end of the third extension part 4213 can extend in a direction away from the first support part 4111. The third extension part 4213 is away from the method. The side wall of the flange unit 13 can be in contact with the end surface of the outer ring assembly 02 close to the flange unit 13, which can make the fixation of the third extension portion 4213 more stable. The second sealing unit 42 may further include a second dust-proof part 423. One end of the second dust-proof part 423 may be connected to an end of the third extension part 4213 away from the first support part 4111 , and the other end of the second dust-proof part 423 may extend toward the direction of the flange unit 13 . The second dust-proof part 423 The extended end of can be arranged at a small distance from the flange unit 13. In this way, when the wheel hub bearing rotates, foreign matter can be reduced from entering the inside of the wheel hub bearing without interfering with the rotation of the wheel hub bearing, allowing the wheel hub bearing to operate stably and smoothly, thereby ensuring the safety of the vehicle and reducing the power of the vehicle while driving. loss.

Those of ordinary skill in the art can understand that the above-mentioned embodiments are specific examples of implementing the present disclosure, and in actual applications, various changes can be made in form and details without departing from the spirit and scope of the present disclosure. .

Claims (5)

1. A hub bearing, said hub bearing comprising:

the inner ring assembly comprises a first inner ring unit and a flange unit; one end of the first inner ring unit is fixedly connected with the flange unit;

the outer ring assembly is sleeved on the outer periphery side of the first inner ring unit;

the rolling assembly is arranged in a space surrounded by the outer ring assembly and the first inner ring unit;

the sealing assembly is arranged on one side, close to the flange unit, of the rolling assembly; the sealing assembly comprises a first sealing unit and a second sealing unit; the first sealing unit comprises a first framework and a first lip; the first framework comprises a first supporting part, a first connecting part and a first extending part; the first supporting part, the first connecting part and the first extending part are sequentially and fixedly connected; the first supporting part is in interference fit with the outer peripheral surface of the first inner ring unit; the first connecting part extends from one end of the first supporting part, which is close to the flange unit, towards the position, which is far away from the first inner ring unit, and the first connecting part is arranged at intervals with the flange unit; the first extension part extends from one end of the first connection part towards a direction away from the flange unit; one end of the first lip part is fixedly connected with the first extension part, and the other end of the first lip part obliquely extends towards a direction away from the first extension part and close to the flange unit; the second sealing unit comprises a second framework and a second lip; the second framework is in interference fit with the inner peripheral surface of the outer ring assembly; one end of the first lip part far away from the first extension part is abutted with the second framework; one end of the second lip is fixedly connected with one end of the second framework, and the other end of the second lip extends towards the direction close to the first supporting part and is abutted against the first supporting part;

the second framework comprises a second supporting part and a second extending part; the second supporting part is in interference fit with the inner peripheral surface of the outer ring assembly; the second extension part extends from one end of the second support part away from the flange unit towards the direction approaching the first inner ring unit; the second lip comprises a second connecting part and a sealing lip; the second connecting part extends from one end of the second extending part away from the second supporting part towards the direction approaching the first inner ring unit; the sealing lip obliquely extends from one end of the second connecting part far away from the second extending part towards a direction close to the first inner ring unit and close to the flange unit, and the extending end of the sealing lip is abutted with the first supporting part;

the second sealing unit further includes a first boss; the first protruding part extends from one end of the second extending part away from the second supporting part towards the direction approaching the rolling assembly; the distance between the extending end of the first protruding part and the side wall of the flange unit is larger than the distance between the end, away from the flange unit, of the first supporting part and the side wall of the flange unit;

the distance between the extending end of the first protruding part and the rolling assembly is 0.3mm-0.5mm;

the second sealing unit further includes a second boss; the second protruding part extends from one side of the second extending part away from the flange unit towards the direction approaching the rolling assembly; the second protruding part is arranged in a space between the first protruding part and the outer ring component; the distance between the second protruding part extending end and the side wall of the flange unit is larger than that between the first protruding part extending end and the side wall of the flange unit;

the second armature further comprises a third extension; the third extension part extends from one end of the second supporting part away from the second extension part towards the direction away from the first inner ring unit; the side wall of the third extension part is abutted with the end face of the outer ring assembly; the second sealing unit further comprises a second dust prevention part; the second dustproof part extends from one end of the third extension part away from the second supporting part towards the flange unit, and the extending end of the second dustproof part is arranged at intervals with the flange unit.

2. A hub bearing according to claim 1, wherein,

the distance between the side wall of the second connecting part far away from the flange unit and the side wall of the flange unit is larger than that between one end of the first supporting part far away from the flange unit and the side wall of the flange unit.

3. A hub bearing according to claim 1, wherein,

the second lip further includes a mounting groove; the mounting groove is arranged on one side of the sealing lip, which is far away from the first inner ring unit; the second sealing unit includes a constriction; the contraction part is sleeved in the mounting groove and applies contraction force to the sealing lip.

4. A hub bearing according to claim 3, wherein,

the distance between the stress point of the contraction part exerting the contraction force and the side wall of the flange unit is larger than the distance between the position, where the sealing lip abuts against the first supporting part, and the side wall of the flange unit.

5. A hub bearing according to claim 1, wherein,

the second sealing unit further comprises a first dust prevention part; the first dust-proof part obliquely extends from one side of the second extending part close to the flange unit towards the direction close to the first extending part; the first dust-proof part extending end is arranged at intervals with the first extending part; the first dust-proof portion is disposed at an interval from the seal lip.