Hub bearing with low friction force

Abstract

The invention relates to the technical field of bearings, in particular to a hub bearing with low friction force. The hub bearing comprises a flange inner ring, a flange outer ring, a rolling body and a sealing assembly, the sealing piece comprises a sealing body, an abutting unit and a blocking unit, and the abutting unit and the blocking unit are both arranged on the sealing body; the sealing body wraps the outer ring framework; the abutting unit is close to the central axis of the flange inner ring, and the blocking unit is away from the central axis of the flange inner ring. The blocking units are arranged at intervals towards the inner ring framework, and the abutting units abut against the inner ring framework. And a closed space for accommodating the rolling body to move is formed among the abutting unit, the flange inner ring and the flange outer ring. According to the hub bearing, the contact area between the sealing piece and the inner ring framework is reduced in the mode that the abutting unit and the blocking unit are combined, and therefore the problem that in the prior art, the friction torque of the hub bearing is large is solved.

Description

Technical Field

[0001] This invention relates to the field of bearing technology, and more specifically, to a low-friction wheel hub bearing. Background Technology

[0002] Bearings are important components used for rotating supports in mechanical bodies. With the development of bearings, many types have emerged, and wheel hub bearings are one of them. Wheel hub bearings integrate components such as oil seals and wheel hubs into a single unit based on a basic rotating support. This makes installation more convenient and provides better sealing and higher precision, making them one of the key components of automobiles.

[0003] However, in order to ensure the sealing effect, existing technologies usually use multi-layer or multi-lip contact seals, which results in a large frictional torque during rotation, affecting the product's performance. Summary of the Invention

[0004] To address the problem of high frictional torque in existing wheel hub bearings, this invention provides a low-friction wheel hub bearing, comprising an inner flange ring, an outer flange ring, rolling elements disposed between the inner flange ring and the outer flange ring, and a sealing assembly; the sealing assembly comprises:

[0005] Inner ring skeleton, the inner ring skeleton is disposed on the inner ring of the flange;

[0006] An outer ring skeleton is disposed on the outer ring of the flange; the outer ring skeleton is opposite to and spaced apart from the inner ring skeleton.

[0007] A sealing element includes a sealing body, an abutment unit, and a blocking unit, both of which are disposed on the sealing body. The sealing body is wrapped around the outer ring skeleton. The abutment unit is close to the central axis of the inner ring of the flange, and the blocking unit is away from the central axis of the inner ring of the flange. The blocking units are spaced apart from the inner ring skeleton, and the abutment unit abuts against the inner ring skeleton. A sealed space is formed between the abutment unit, the inner ring of the flange, and the outer ring of the flange to accommodate the movement of the rolling element.

[0008] Optionally, the inner ring skeleton includes a first bent segment, a second bent segment, a third bent segment, a fourth bent segment, a fifth bent segment, and a sixth bent segment connected in sequence; the sixth bent segment is connected to the inner ring of the flange, and the fourth bent segment is parallel to and spaced apart from the side end face of the inner ring of the flange.

[0009] Optionally, the spacing between the blocking unit and the inner ring skeleton is smaller than the spacing between the fourth bend segment in the inner ring skeleton and the inner ring of the flange.

[0010] Optionally, the abutting unit includes a first abutting lip and a second abutting lip, both of which are connected to the sealing body; the first abutting lip is disposed in the direction of the second abutting lip near the rolling element, the first abutting lip is press-fitted against the inner ring skeleton, and the end of the first abutting lip faces the rolling element; the second abutting lip is press-fitted against the inner ring skeleton, and the end of the second abutting lip faces away from the rolling element.

[0011] Optionally, the thickness ratio of the second abutment lip to the first abutment lip is between 1.5 and 2.5.

[0012] Optionally, the bending angle between the first bending segment and the second bending segment is a right angle, and the bending angle between the third bending segment and the fourth bending segment is a right angle; the blocking unit includes a first blocking lip, a second blocking lip, and a third blocking lip; the first blocking lip is arranged at intervals toward the end of the first bending segment, the second blocking lip is arranged at intervals toward the bending angle between the first bending segment and the second bending segment, and the third blocking lip is arranged at intervals toward the bending angle between the third bending segment and the fourth bending segment.

[0013] Optionally, the end of the third blocking lip is bent toward the direction of the third bent section, and a groove is provided on the sealing body, the groove and the third blocking lip forming a first cavity.

[0014] Optionally, the thickness of the first blocking lip is greater than the thickness of the third blocking lip, and the thickness of the third blocking lip is greater than the thickness of the second blocking lip.

[0015] Optionally, the outer ring skeleton includes an outer ring body, and a bent portion is provided at one end of the outer ring body away from the rolling element. The outer ring body is connected to the flange outer ring, and the bent portion and the flange outer ring are spaced apart to form a second cavity. A filling portion is provided on the sealing body, and the filling portion is disposed in the second cavity.

[0016] Optionally, the outer ring body is provided with an extension at one end near the rolling element, and the extension is arranged at intervals toward the sixth bending segment;

[0017] The sealing body is provided with a folded portion, which is sleeved on the extension portion.

[0018] To address the problem of high frictional torque in existing wheel hub bearings, this invention offers the following advantages:

[0019] By extending the abutment unit and blocking unit on the seal body, the contact area between the seal and the inner ring skeleton can be reduced, thereby reducing the frictional torque.

[0020] Meanwhile, multiple abutment units and multiple blocking units are extended and set on the main body of the seal, forming multiple blocking areas and multiple sealing areas within the overall sealing area, effectively ensuring the sealing performance of the wheel hub bearing. Attached Figure Description

[0021] Figure 1 A schematic diagram of a hub bearing according to one embodiment is shown;

[0022] Figure 2 It shows Figure 1 A magnified schematic diagram of part A in the middle.

[0023] Figure label:

[0024] Sealing assembly 10, flange inner ring 20, flange outer ring 30, rolling element 40.

[0025] Inner ring frame 11, first bend segment 111, second bend segment 112, third bend segment 113, fourth bend segment 114, fifth bend segment 115, sixth bend segment 116.

[0026] Outer ring frame 12, outer ring body 121, bending part 122, extension part 123.

[0027] Seal 13, sealing body 131, abutting unit 132, first abutting lip 1321, second abutting lip 1322, blocking unit 133, first blocking lip 1331, second blocking lip 1332, third blocking lip 1333, filling part 134, folding part 135, groove 136. Detailed Implementation

[0028] The present disclosure will now be discussed with reference to several exemplary embodiments. It should be understood that these embodiments are discussed only to enable those skilled in the art to better understand and thus implement the present disclosure, and are not intended to imply any limitation on the scope of the disclosure.

[0029] As used herein, the term "comprising" and its variations are to be interpreted as open-ended terms meaning "including but not limited to". The term "based on" is to be interpreted as "at least partially based on". The terms "one embodiment" and "an embodiment" are to be interpreted as "at least one embodiment". The term "another embodiment" is to be interpreted as "at least one other embodiment". The terms "upper", "lower", "left", "right", "front", "rear", "top", "bottom", "inner", "outer", "vertical", "horizontal", "lateral", "longitudinal", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. These terms are primarily for the purpose of better describing this application and its embodiments and are not intended to limit the indicated devices, elements, or components to having a specific orientation or being constructed and operated in a specific orientation. Furthermore, some of the above terms may be used to indicate other meanings besides orientations or positional relationships; for example, the term "upper" may in some cases indicate a dependency or connection relationship. Those skilled in the art can understand the specific meaning of these terms in this application according to the specific circumstances. In addition, the terms "installed", "set up", "equipped with", "connected", and "linked" should be interpreted 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 a direct connection or an indirect connection through an intermediate medium, or an internal connection between two devices, elements, or components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances. Furthermore, the terms "first," "second," etc., are mainly used to distinguish different devices, elements, or components (the specific types and structures may be the same or different), and are not used to indicate or imply the relative importance or quantity of the indicated devices, elements, or components. Unless otherwise stated, "a plurality of" means two or more.

[0030] Wheel hub bearings are one of the key components of automobiles. In order to ensure the sealing effect of wheel hub bearings, existing technologies usually set up multi-layer or multi-lip contact seals to ensure the sealing effect. This results in a large frictional torque during rotation, which affects the performance of the product.

[0031] To address the problem of high frictional torque in existing wheel hub bearings, this invention provides a low-friction wheel hub bearing.

[0032] Example 1:

[0033] In this embodiment, as Figure 1As shown, the hub bearing includes a flange outer ring 30, a flange inner ring 20, rolling elements 40 disposed between the flange outer ring 30 and the flange inner ring 20, and a sealing assembly 10. The sealing assembly 10 includes an inner ring skeleton 11, an outer ring skeleton 12, and a seal 13. In this embodiment, the flange inner ring 20 is disposed on the central axis of the entire hub bearing, the flange outer ring 30 is sleeved on the outside of the flange inner ring 20, the sealing assembly 10 is disposed between the flange outer ring 30 and the flange inner ring 20, and the rolling elements 40 are movable between the flange outer ring 30 and the flange inner ring 20.

[0034] The inner ring skeleton 11 is disposed on the inner ring 20 of the flange, and the outer ring skeleton 12 is disposed on the outer ring 30 of the flange. The outer ring skeleton 12 and the inner ring skeleton 11 are arranged opposite to each other and spaced apart. In this embodiment, both the outer ring skeleton 12 and the inner ring skeleton 11 have bent sections. The outer ring skeleton 12 and the inner ring skeleton 11 are arranged opposite to each other as a whole, so that the bent sections on the outer ring skeleton 12 and the inner ring skeleton 11 are also opposite to each other, ensuring that the relative distance between the outer ring skeleton 12 and the inner ring skeleton 11 is stable.

[0035] The sealing element 13 is sleeved on the outer ring skeleton 12. The sealing element 13 includes a sealing body 131, an abutment unit 132, and a blocking unit 133, with the abutment unit 132 and the blocking unit 133 both disposed on the sealing body 131. In this embodiment, the sealing body 131, the abutment unit 132, and the blocking unit 133 are integrally formed, thereby greatly improving the structural strength of the sealing element 13 itself and helping to extend the service life of the abutment unit 132 and the blocking unit 133.

[0036] The sealing body 131 is wrapped around the outer ring skeleton 12, the abutment unit 132 is close to the central axis of the inner ring 20 of the flange, and the blocking unit 133 is away from the central axis of the inner ring 20 of the flange.

[0037] The blocking units 133 are arranged at intervals toward the inner ring frame 11, and the abutting units 132 abut against the inner ring frame 11; a sealed space is formed between the abutting units 132, the inner ring 20 of the flange and the outer ring 30 of the flange to accommodate the movement of the rolling element 40.

[0038] To address the issue of high frictional torque in existing wheel hub bearings, this embodiment incorporates an abutment unit 132 and a blocking unit 133 on the seal 13. In this embodiment, the blocking unit 133 is located at the front of the overall sealing area. The blocking unit 133 prevents external liquids or foreign objects from entering the sealing area, and there is no contact between the blocking unit 133 and the inner ring skeleton 11. The abutment unit 132 is located at the rear of the overall sealing area. The abutment unit 132 seals the internal rolling space of the wheel hub bearing, and the abutment unit 132 only abuts against the inner ring skeleton 11 through a limited portion at its end.

[0039] In summary, this embodiment, while ensuring the sealing effect of the wheel hub bearing, significantly reduces the contact area between the seal and the inner ring skeleton, effectively reducing the frictional torque of the wheel hub bearing during use, thereby improving the working performance of the wheel hub bearing.

[0040] Furthermore, such as Figure 2 As shown, the inner ring skeleton 11 includes a first bent section 111, a second bent section 112, a third bent section 113, a fourth bent section 114, a fifth bent section 115, and a sixth bent section 116 connected in sequence. The sixth bent section 116 is connected to the flange inner ring 20, and the fourth bent section 114 is parallel to and spaced apart from the side end face of the flange inner ring 20. Specifically, the inner ring skeleton 11 is composed of six bent sections connected in sequence. Through the continuous bending design, the inner ring skeleton 11 is arranged in a way that wraps around the sealing element 13, which helps to reduce the gap between the corresponding positions on the inner ring skeleton 11 and the corresponding positions on the sealing element 13, and improves the overall sealing performance. The fourth bend 114 is closest to the side end face of the inner ring 20 of the flange, and is parallel to and spaced apart from the side end face of the inner ring 20 of the flange. This ensures that most of the structure of the inner ring skeleton 11 has a gap with the inner ring 20 of the flange. When the rolling element 40 applies pressure to the inner ring skeleton 11 during rolling, the inner ring skeleton 11 can deform in the direction of the inner ring 20 of the flange.

[0041] Furthermore, such as Figure 2 As shown, the gap between the blocking unit 133 and the inner ring skeleton 11 is smaller than the gap between the fourth bend section 114 in the inner ring skeleton 11 and the inner ring of the flange 20. In this embodiment, when the pressure applied by the rolling element 40 during rolling first presses against the outer ring skeleton 12, the outer ring skeleton 12 drives the blocking unit 133 to move towards the inner ring skeleton 11. At the same time, the outer ring skeleton 12 drives the abutment unit 132 to push the inner ring skeleton 11 towards the inner ring of the flange 20. Since the gap between the blocking unit 133 and the inner ring skeleton 11 is smaller than the gap between the fourth bend section 114 in the inner ring skeleton 11 and the inner ring of the flange 20, the blocking unit 133 is not easy or extremely difficult to abut against the inner ring skeleton 11.

[0042] Furthermore, such as Figure 2As shown, the abutment unit 132 includes a first abutment lip 1321 and a second abutment lip 1322. The first abutment lip 1321 is close to the rolling element 40 and is press-fitted against the inner ring skeleton 11, with its end facing the rolling element 40. The second abutment lip 1322 is press-fitted against the inner ring skeleton 11. In this embodiment, the end of the first abutment lip 1321 faces the rolling element 40. The first abutment lip 1321 is used to seal the lubricating oil inside the raceway. When pressure is generated inside the raceway, it will squeeze the inner surface of the first abutment lip 1321, making the contact between the first abutment lip 1321 and the inner ring skeleton 11 tighter and the sealing effect better.

[0043] Furthermore, such as Figure 2 As shown, the end of the second abutment lip 1322 faces away from the rolling element 40. In this embodiment, the end of the second abutment lip 1322 faces away from the rolling element 40. The second abutment lip 1322 is used to seal liquids and foreign objects outside the raceway. When pressure is generated outside the raceway, it will squeeze the outer surface of the second abutment lip 1322, making the contact between the second abutment lip 1322 and the inner ring skeleton 11 tighter and the sealing effect better.

[0044] Furthermore, such as Figure 2 As shown, the thickness ratio of the second abutment lip 1322 to the first abutment lip 1321 is between 1.5 and 2.5. In this embodiment, the second abutment lip 1322 serves as the first sealing barrier of the sealant 13, and increasing its thickness is beneficial for providing the sealing capability of the second abutment lip 1322.

[0045] Furthermore, such as Figure 2As shown, the bending angle between the first bending segment 111 and the second bending segment 112 is a right angle, and the bending angle between the third bending segment 113 and the fourth bending segment 114 is a right angle. The blocking unit 133 includes a first blocking lip 1331, a second blocking lip 1332, and a third blocking lip 1333. The first blocking lip 1331 is spaced apart from the end of the first bending segment 111, the second blocking lip 1332 is spaced apart from the bending angle between the first bending segment 111 and the second bending segment 112, and the third blocking lip 1333 is spaced apart from the bending angle between the third bending segment 113 and the fourth bending segment 114. In this embodiment, by setting three blocking lines, a multi-layer sealing structure is formed, which has a superimposed effect in ensuring sealing performance and can more effectively block the intrusion of external impurities and liquids. At the same time, since the design of each lip fully considers the factor of reducing frictional torque, the multi-layer structure does not cause a significant increase in frictional torque due to the increase in the number of layers during operation. On the contrary, the lips cooperate with each other to achieve a low frictional torque while ensuring sealing, thereby improving the overall performance and operational stability of the equipment and effectively reducing the working pressure of the contact unit 132.

[0046] Furthermore, such as Figure 2 As shown, the end of the third blocking lip 1333 is bent toward the direction of the third bending section 113, and a groove 136 is provided on the sealing body 131. The groove 136 and the third blocking lip 1333 combine to form a first cavity. In this embodiment, the third blocking lip 1333 serves as the last line of defense. The first cavity formed in front of the third blocking lip 1333 is beneficial for containing external liquids and foreign objects, effectively reducing the working pressure of the contact unit 132.

[0047] Furthermore, such as Figure 2 As shown, the thickness of the first blocking lip 1331 is greater than the thickness of the third blocking lip 1333, and the thickness of the third blocking lip 1333 is greater than the thickness of the second blocking lip 1332. In this embodiment, the overall thickening of the first blocking lip 1331 is beneficial to improving its own strength and extending its service life. The thickening of the third blocking lip 1333 is beneficial to improving its own strength and extending its service life, while also better protecting the subsequent abutment unit 132.

[0048] Furthermore, such as Figure 2As shown, the outer ring skeleton 12 includes an outer ring body 121. A bent portion 122 is provided at the end of the outer ring body 121 away from the rolling element. The outer ring body 121 is connected to the flange outer ring 30. The bent portion 122 and the flange outer ring 30 are spaced apart to form a second cavity. A filling portion 134 is provided on the sealing body 131 and is disposed within the second cavity. In this embodiment, the mating structure of the bent portion 122 and the filling portion 134 helps to improve the stability between the outer ring skeleton 12 and the sealing body 131.

[0049] Furthermore, such as Figure 2 As shown, the outer ring body 121 has an extension 123 near the rolling element, and the extension 123 is spaced apart towards the sixth bend segment 116. The sealing body 131 has a folded-back portion 135, which is fitted onto the extension 123. In this embodiment, the outer ring skeleton 12 is fitted to the flange outer ring 30, resulting in more uniform stress distribution between the outer ring skeleton 12 and the flange outer ring 30, which helps to improve the bonding strength and stability between the outer ring skeleton 12 and the flange outer ring 30.

[0050] Meanwhile, the two ends of the seal 13 are wrapped around the outer ring skeleton 12 by the filling part 134 and the fold-back part 135 respectively, which effectively strengthens the bonding strength and stability between the seal 13 and the outer ring skeleton 12.

[0051] In summary, to solve the problem of high frictional torque in existing wheel hub bearings, this solution has the following advantages:

[0052] By extending the abutment unit and blocking unit on the seal body, the contact area between the seal and the inner ring skeleton can be reduced, thereby reducing the frictional torque.

[0053] Meanwhile, multiple abutment units and multiple blocking units are extended and set on the main body of the seal, forming multiple blocking areas and multiple sealing areas within the overall sealing area, effectively ensuring the sealing performance of the wheel hub bearing.

[0054] Those skilled in the art will understand that the above embodiments are specific examples of implementing this disclosure, and in practical applications, various changes can be made in form and detail without departing from the scope of this disclosure.

Claims

1. A low-friction wheel hub bearing, characterized in that, The hub bearing includes an inner flange ring, an outer flange ring, rolling elements disposed between the inner flange ring and the outer flange ring, and a sealing assembly; the sealing assembly includes: Inner ring skeleton, the inner ring skeleton is disposed on the inner ring of the flange; An outer ring skeleton is disposed on the outer ring of the flange; the outer ring skeleton is opposite to and spaced apart from the inner ring skeleton. A sealing element includes a sealing body, an abutment unit, and a blocking unit, both of which are disposed on the sealing body. The sealing body is wrapped around the outer ring skeleton. The abutment unit is close to the central axis of the inner ring of the flange, and the blocking unit is away from the central axis of the inner ring of the flange. The blocking units are spaced apart from the inner ring skeleton, and the abutment unit abuts against the inner ring skeleton. A sealed space is formed between the abutment unit, the inner ring of the flange, and the outer ring of the flange to accommodate the movement of the rolling element.

2. The low-friction hub bearing according to claim 1, characterized in that, The inner ring skeleton includes a first bent section, a second bent section, a third bent section, a fourth bent section, a fifth bent section, and a sixth bent section that are connected in sequence; the sixth bent section is connected to the inner ring of the flange, and the fourth bent section is parallel to and spaced apart from the side end face of the inner ring of the flange.

3. A low-friction wheel hub bearing according to claim 2, characterized in that, The spacing between the blocking unit and the inner ring skeleton is smaller than the spacing between the fourth bending segment in the inner ring skeleton and the inner ring of the flange.

4. A low-friction hub bearing according to claim 1, characterized in that, The abutting unit includes a first abutting lip and a second abutting lip, both of which are connected to the sealing body. The first abutting lip is disposed in the direction of the second abutting lip near the rolling element, and the first abutting lip is press-fitted against the inner ring skeleton, with its end facing the rolling element. The second abutting lip is press-fitted against the inner ring skeleton, with its end facing away from the rolling element.

5. A low-friction wheel hub bearing according to claim 4, characterized in that, The thickness ratio of the second abutment lip to the first abutment lip is between 1.5 and 2.

5.

6. A low-friction wheel hub bearing according to claim 2, characterized in that, The bending angle between the first bending segment and the second bending segment is a right angle, and the bending angle between the third bending segment and the fourth bending segment is a right angle; the blocking unit includes a first blocking lip, a second blocking lip, and a third blocking lip; the first blocking lip is arranged at intervals toward the end of the first bending segment, the second blocking lip is arranged at intervals toward the bending angle between the first bending segment and the second bending segment, and the third blocking lip is arranged at intervals toward the bending angle between the third bending segment and the fourth bending segment.

7. A low-friction wheel hub bearing according to claim 6, characterized in that, The end of the third blocking lip is bent toward the direction of the third bending section, and a groove is provided on the sealing body. The groove and the third blocking lip combine to form a first cavity.

8. A low-friction wheel hub bearing according to claim 6, characterized in that, The thickness of the first blocking lip is greater than the thickness of the third blocking lip, and the thickness of the third blocking lip is greater than the thickness of the second blocking lip.

9. A low-friction wheel hub bearing according to claim 2, characterized in that, The outer ring skeleton includes an outer ring body, and a bent portion is provided at one end of the outer ring body away from the rolling element. The outer ring body is connected to the flange outer ring, and the bent portion and the flange outer ring are spaced apart to form a second cavity. A filling portion is provided on the sealing body, and the filling portion is disposed in the second cavity.

10. A low-friction wheel hub bearing according to claim 9, characterized in that, An extension is provided at one end of the outer ring body near the rolling element, and the extension is arranged at intervals toward the sixth bending segment; a fold-back portion is provided on the sealing body, and the fold-back portion is sleeved on the extension.

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