Low-friction combined hub sealing structure

Abstract

The utility model discloses a low-friction combined type hub sealing structure which comprises a first framework, a second framework and a first elastic piece arranged on the second framework, the first framework is connected with a shaft, the first elastic piece is provided with a first lip, a second lip and a third lip, and the second lip is connected with the third lip. The second lip and the third lip are both in interference fit with the first framework, the first lip and the first framework form a first circulation cavity, a second circulation cavity is formed among the first lip, the second lip and the first framework, the first circulation cavity is communicated with the second circulation cavity, and the second circulation cavity is communicated with the third lip. The third lip, the second lip and the first framework form a sealing cavity, and the roughness of the portion, abutting against the third lip and / or the second lip, of the first framework is smaller than that of other portions of the first framework. The ultra-low torque of the hub sealing ring is achieved, and meanwhile the sealing performance and the service life of the whole hub oil seal can be guaranteed to the maximum extent.

Description

Technical Field

[0001] The utility model relates to the technical field of sealing structures with skeletons, in particular to a low-friction combined hub sealing structure. Background Art

[0002] The wheel hub seal ring has the function of protecting the sealing medium from leakage and preventing mud and water. Most bearing seal rings are composed of a rubber body and a skeleton. During use, as the sealing lip wears, the use effect of the seal ring will be affected. Therefore, a reasonable design of the seal ring structure to ensure the stability of the lip can effectively prevent flying dust, mud and water from entering the wheel hub unit or prevent internal grease from leaking, which plays a key role in the quality and life of the wheel hub unit. With the development of new energy vehicles, people have begun to pay attention to energy conservation and emission reduction. On the basis of traditional seal rings that can ensure normal sealing effects, they have begun to pursue low friction torque. The friction torque of the seal ring is small, the energy loss of the vehicle is small, and the fuel economy is further optimized and improved, actively responding to the call for energy conservation and emission reduction. In order to achieve a better sealing effect, the rotational torque generated by the existing seal ring is also relatively large. Therefore, the current development direction is to develop a seal ring that can not only ensure the sealing effect but also reduce the friction torque while reducing the sealing structure.

[0003] On October 21, 2021, our company applied for "A wheel hub seal with ultra-low rotational friction torque". The patent announcement number is: CN 216666490U; by setting a first metal skeleton, a second metal skeleton and multiple sealing lips, the friction torque can be reduced to a certain extent. However, the shortcoming of this patent is that the volume of the position where the fifth sealing lip is gap-fitted with the first skeleton and the fourth sealing lip is in interference contact with the first skeleton is relatively large, which increases the friction torque to a certain extent. Utility Model Content

[0004] In order to solve the technical problems existing in the background technology, the utility model proposes a low-friction combined hub sealing structure.

[0005] The utility model proposes a low-friction combined wheel hub sealing structure, comprising a first skeleton, a second skeleton and a first elastic member arranged on the second skeleton, the first skeleton is connected to the shaft, the first elastic member has a first lip, a second lip and a third lip, the second lip and the third lip are both interference fit with the first skeleton, the first lip and the first skeleton form a first circulation cavity, a second circulation cavity is formed between the first lip, the second lip and the first skeleton, the first circulation cavity is connected with the second circulation cavity, the third lip, the second lip and the first skeleton form a sealing cavity, the roughness of the first skeleton and the third lip and / or the second lip conflicting part is less than the roughness of other parts of the first skeleton, that is, the friction reducing grinding and other treatments are performed on the conflicting part of the first skeleton and the third lip and / or the conflicting part of the first skeleton and the second lip, while the grinding treatment is not performed on the part of the first skeleton that does not conflict with the second lip and / or the third lip.

[0006] The inner side surface of the first skeleton is sleeved on the outside of the shaft. Preferably, the first skeleton and the second skeleton are metal skeletons. During use, due to the structural setting of the first circulation chamber, after part of the cement circulates through the first circulation chamber, most of it is discharged from the first circulation chamber, and the mud and water will be discharged into the second circulation chamber. The mud and water in the second circulation chamber circulate out of the first circulation chamber and are discharged through the first circulation chamber. The sealing effect is further achieved by the set sealing chamber, and the first lip and the second lip are tightly matched with the first skeleton. The roughness Ra of the part of the first skeleton that conflicts with the third lip and / or the second lip is in the range of 0.2μm-0.5μm, that is, the roughness Ra of the part of the first skeleton that conflicts with the third lip and the second lip is in the range of 0.2μm-0.5μm or the roughness Ra of the part of the first skeleton that conflicts with the third lip is in the range of 0.2μm-0.5μm or the roughness Ra of the part of the first skeleton that conflicts with the second lip is in the range of 0.2μm-0.5μm, thereby reducing the friction torque while ensuring the sealing performance.

[0007] Preferably, the roughness of the part of the first skeleton that conflicts with the third lip and / or the second lip is smaller than the roughness of other parts of the first skeleton and / or the second skeleton.

[0008] Preferably, an installation cavity having an entrance and an exit is formed between the first skeleton and the second skeleton, the first lip, the second lip and the third lip are located in the installation cavity, the first circulation cavity is connected to the entrance, and the third lip seals the exit of the installation cavity.

[0009] Preferably, the first lip has a portion parallel to the second skeleton and / or the first skeleton.

[0010] Preferably, the first elastic member has an extension portion away from the first frame, a mounting groove is formed on the second frame, and the extension portion is interference fit with the mounting groove.

[0011] Preferably, the width of the extension portion gradually widens from a side away from the first frame to a side close to the first frame.

[0012] Preferably, a second elastic member is provided on the end surface of the first frame away from the second frame.

[0013] Preferably, the second elastic member is a magnetic elastic member.

[0014] Preferably, the second elastic member has a portion located in the first circulation cavity, and an upper separation lip is provided on the second elastic member. The upper separation lip is closer to the second circulation cavity relative to the first lip, and a first elastic circulation cavity is formed between the upper separation lip and the first elastic member. The first elastic circulation cavity is connected to the first circulation cavity and the second circulation cavity.

[0015] Preferably, the upper partition lip has a portion parallel to the first frame.

[0016] In the utility model, the proposed low-friction combined wheel hub sealing structure blocks cement through the first circulation chamber, the second circulation chamber and the sealing chamber formed by the first lip, the second lip and the third lip and the first skeleton, and the roughness of the part of the first skeleton that conflicts with the third lip and / or the second lip is smaller than the roughness of other parts of the first skeleton, so as to reduce the friction torque; preferably, the first circulation chamber, the second circulation chamber and the sealing chamber have sufficient storage space, so as to achieve ultra-low torque of the wheel hub sealing ring while maximizing the sealing performance and service life of the entire wheel hub oil seal.

[0017] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the structure of the utility model;

[0019] Figure 2 This is a schematic diagram of the structure of one embodiment of the utility model;

[0020] Figure 3 This is a schematic structural diagram of another embodiment of the utility model;

[0021] Figure 4 This is a schematic diagram of the structure of one embodiment of the utility model;

[0022] Figure 5 This is a schematic diagram of the structure of one embodiment of the utility model;

[0023] In the figure: 1. first skeleton; 2. second skeleton; 3. first elastic member; 4. first lip; 5. second lip; 6. third lip; 7. first circulation cavity; 8. second circulation cavity; 9. sealing cavity; 10. extension portion; 11. mounting groove; 12. second elastic member; 13. sealing convex ring; 14. upper partition lip; 15. first elastic circulation cavity; 16. lower partition lip; 17. second elastic circulation cavity. DETAILED DESCRIPTION

[0024] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar symbols throughout represent the same or similar elements or elements with the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0025] like Figure 1 A low-friction combined hub seal structure is shown, comprising a first frame 1, a second frame 2 and a first elastic member 3 arranged on the second frame 2, the first elastic member 3 can be made of rubber, a mounting cavity with an inlet and an outlet is formed between the first frame 1 and the second frame 2, the first frame 1 is connected to the shaft, the first elastic member 3 has a first lip 4, a second lip 5 and a third lip 6, the first lip 4, the second lip 5 and the third lip 6 are located in the mounting cavity, and the third lip 6 seals the outlet of the mounting cavity, the second lip 5 and the third lip 6 are both connected to the The first skeleton 1 is interference fit, the first lip 4 and the first skeleton 1 form a first circulation cavity 7, the first circulation cavity 7 is connected to the inlet, the first lip 4, the second lip 5 and the first skeleton 1 form a second circulation cavity 8, the first circulation cavity 7 is connected to the second circulation cavity 8, the third lip 6, the second lip 5 and the first skeleton 1 form a sealing cavity 9, the second circulation cavity 8 is located between the first circulation cavity 7 and the sealing cavity 9, the roughness Ra of the part of the first skeleton 1 that conflicts with the third lip 6 and the second lip 5 is in the range of 0.2μm-0.5μm; Figure 1 As shown, in order to ensure that even after the second lip 5 and the third lip 6 slide relative to the first frame 1, the friction torque can still be reduced to a good extent, preferably, the first frame 1 and the third lip 6 and the second lip 5 are also ground on both sides of the part in conflict with each other, such as Figure 1 As shown, the inner end surface of the first frame 1 is in conflict with the second lip 5, the inner side surface of the first frame 1 is in conflict with the third lip 6, and part of the upper end surface and the inner side surface of the first frame are ground, that is, the roughness of this part is less than the roughness of other parts of the first frame 1, as shown in FIG. Figure 1-5As shown, the thickened portion of the first frame 1 is similar to the upper end surface and the inner side surface of the "7" shape and is ground;

[0026] Preferably, the roughness of the part where the first skeleton 1 conflicts with the third lip 6 and the part where the first skeleton 1 conflicts with the second lip 5 is smaller than the roughness of other parts of the first skeleton 1 and / or the second skeleton 2;

[0027] The second lip 5 is interference fit with the first frame 1, and the contact interference between the second lip 5 and the first frame 1, the rubber thickness of the second lip 5 and the adjustment of the lip angle replace the traditional sealing lip with a spring to enhance the sealing performance of the lip. There is no need to install a spring, which not only reduces the production process, improves production efficiency and saves production costs. Compared with the old structure with a spring, its friction torque is also reduced; although the interference fit between the third lip 6 and the first frame 1 will increase the friction torque, compared with the original structure, the entire sealing ring has one less lip, so the overall friction torque is greatly reduced, and the sealing effect of the sealing ring is also guaranteed at the same time. Under the joint improvement of the first lip 4, the second lip 5 and the third lip 6, and under the premise of ensuring the sealing effect, the rotational friction torque of the entire sealing ring is greatly improved.

[0028] During operation, the first skeleton 1 is connected to the shaft. When cement enters the first circulation chamber 7, most of the muddy water will undergo an internal circulation due to the protection of the first lip 4. This part of the muddy water will be discharged out of the sealing ring again, which will block a large part of the muddy water from entering the second circulation chamber 8, reduce the contact between the muddy water and the second lip 5 of the first elastic member 3, and increase the service life of the second lip 5 of the first elastic member 3. When the second lip 5 fails, the muddy water enters the sealing chamber 9, and the third lip 6 acts as the last layer of protection to prevent external muddy water from entering the inside of the sealing ring bearing. The third lip 6 and the first skeleton 1 are interference fits, which further ensures that external muddy water cannot directly enter the inside of the sealing ring and cause bearing failure. Therefore, the entire hub sealing ring is composed of multiple rubber sealing lips, multiple circulation chambers, and a sealing chamber 9 body working together. The first circulation chamber 7, the second circulation chamber 8 and the sealing chamber 9 all have sufficient storage space. Even if the front lip fails due to wear, the entire sealing ring will not fail immediately, forming a sealing system in which multiple sealing chambers 9 and multiple lips work together to protect each other. This can achieve ultra-low torque of the wheel hub sealing ring while maximizing the sealing performance and service life of the entire wheel hub oil seal.

[0029] Preferably, if Figure 1As shown, a Y-shaped structure is formed between the first lip 4 and the first elastic member 3, and the first lip 4 has a portion parallel to the second frame 2 and the first frame 1. This structure not only allows a portion of the muddy water entering the sealing ring to flow back and discharge, but also greatly reduces the contact area between the lip and the frame surface, which not only enhances the sealing effect of the sealing ring but also greatly reduces the rotation torque.

[0030] In some embodiments, preferably, Figure 2 As shown, the first elastic member 3 has an extension portion 10 away from the first frame 1, and the second frame 2 is provided with a mounting groove 11. The extension portion 10 and the mounting groove 11 are interference fit to increase the stability of the connection between the first elastic member 3 and the second frame 2.

[0031] Preferably, if Figure 2 As shown, the width of the extension portion 10 gradually widens from a side away from the first frame 1 to a side close to the first frame 1 .

[0032] Preferably, if Figure 3 As shown, based on any of the above embodiments, in some embodiments, preferably, a second elastic member 12 is provided on the end face of the first skeleton 1 away from the second skeleton 2, and the second elastic member 12 is also supported by an elastic material, preferably made of a magnetic elastic material, which is more flexible to adapt to some installation requirements.

[0033] like Figure 2 As shown, in some embodiments, preferably, a sealing convex ring 13 is provided at the upper end of the second elastic member 12 .

[0034] Preferably, if Figure 4 As shown, on the basis of the above embodiment, the second elastic member 12 has a portion located in the first circulation cavity 7, and an upper separation lip 14 is provided on the second elastic member 12. The upper separation lip 14 is close to the second circulation cavity 8 relative to the first lip 4, and a first elastic circulation cavity 15 is formed between the upper separation lip 14 and the first elastic member 3. The first elastic circulation cavity 15 is connected with the first circulation cavity 7 and the second circulation cavity 8, thereby further improving the sealing effect.

[0035] like Figure 5 As shown, in some embodiments, preferably, a lower partition lip 16 is further provided on the first elastic member 3, and the lower partition lip 16 is arranged between the first lip 4 and the second lip 5. At least two groups of upper partition lips 14 are provided, and one group of lower partition lips 16 is arranged between the two groups of lower partition lips 16. The second lip 5, the first skeleton 1 and the upper partition lip 14 away from the first lip 4 form a second circulation cavity 8. A second elastic circulation cavity 17 is formed between the upper partition lip 14 and the lower partition lip 16 and the first elastic member 3 and the second elastic member 12 to further increase the sealing effect.

[0036] Preferably, the upper partition lip 14 has a portion parallel to the first frame 1 to further enhance the sealing performance.

[0037] Preferably, the lower partition lip 16 has a portion parallel to the first frame 1 or the second elastic member 12 to further enhance the sealing performance.

[0038] It should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0039] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present utility model, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0040] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0041] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0042] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes within the technical scope disclosed by the present invention according to the technical scheme and the utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A low-friction combined hub seal structure, comprising a first frame (1) and a second frame (2) and a first elastic member (3) arranged on the second frame (2), wherein the first frame (1) is connected to a shaft, and is characterized in that: The first elastic member (3) comprises a first lip (4), a second lip (5) and a third lip (6); the first lip (4) and the first frame (1) form a first circulation cavity (7); a second circulation cavity (8) is formed between the first lip (4), the second lip (5) and the first frame (1); the first circulation cavity (7) is connected to the second circulation cavity (8); the third lip (6), the second lip (5) and the first frame (1) form a sealing cavity (9); the roughness Ra of the part where the first frame (1) and the third lip (6) are in contact and / or the part where the first frame (1) and the second lip (5) are in contact is in the range of 0.2 μm-0.5 μm.

2. The low-friction combined hub seal structure according to claim 1, characterized in that: The roughness of the part where the first skeleton (1) conflicts with the third lip (6) and / or the part where the first skeleton (1) conflicts with the second lip (5) is smaller than the roughness of other parts of the first skeleton (1) and / or the second skeleton (2).

3. The low-friction combined hub seal structure according to claim 1, characterized in that: An installation cavity having an inlet and an outlet is formed between the first skeleton (1) and the second skeleton (2); the first lip (4), the second lip (5) and the third lip (6) are located in the installation cavity; the first circulation cavity (7) is connected to the inlet, and the third lip (6) seals the outlet of the installation cavity.

4. The low-friction combined hub seal structure according to claim 1, characterized in that: The first lip (4) has a portion parallel to the second frame (2) and / or the first frame (1).

5. The low-friction combined hub seal structure according to claim 1, characterized in that: The first elastic member (3) has an extension portion (10) extending away from the first frame (1), and a mounting groove (11) is provided on the second frame (2), and the extension portion (10) is interference-fitted with the mounting groove (11).

6. The low-friction combined hub seal structure according to claim 5, characterized in that: The width of the extension portion (10) gradually widens from a side away from the first frame (1) to a side close to the first frame (1).

7. The low-friction combined hub seal structure according to any one of claims 1 to 6, characterized in that: A second elastic member (12) is provided on the end surface of the first frame (1) away from the second frame (2).

8. The low-friction combined hub seal structure according to claim 7, characterized in that: The second elastic member (12) is a magnetic elastic member.

9. The low-friction combined hub seal structure according to claim 7, characterized in that: The second elastic member (12) has a portion located in the first circulation cavity (7), and an upper separation lip (14) is provided on the second elastic member (12). The upper separation lip (14) is closer to the second circulation cavity (8) relative to the first lip (4), and a first elastic circulation cavity (15) is formed between the upper separation lip (14) and the first elastic member (3), and the first elastic circulation cavity (15) is connected to the first circulation cavity (7) and the second circulation cavity (8).

10. The low-friction combined hub seal structure according to claim 9, characterized in that: The upper partition lip (14) has a portion parallel to the first frame (1).

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