Oil seal part, rear axle assembly and vehicle

Abstract

The utility model provides an oil seal part, a rear axle assembly and a vehicle. The oil sealing piece comprises an annular framework and a flexible sealing body. The annular framework comprises an annular part and a blocking part. The ring portion extends parallel to the axis of the oil seal. And the end part of the blocking part is connected with the end part of the ring part and extends towards the axis. The annular framework further comprises an inner surface and an outer surface which are oppositely arranged. The inner surface is arranged on the side, facing the axis, of the ring part and the side, facing the ring part, of the blocking part. The flexible sealing body comprises a sealing part and a main body part. The main body part is arranged on the outer surface. The sealing portion is disposed on the inner surface and extends beyond the body portion toward the axis. The end, away from the main body part, of the sealing part is used for being connected with a rotating piece. The main body part is connected with the sealing part and wraps the end, away from the ring part, of the blocking part.

Description

Technical Field

[0001] The present application relates to the field of vehicles, and in particular to an oil seal, a rear axle assembly and a vehicle. Background Art

[0002] In order to meet the increasingly stringent CAFC (Corporate Average Fuel Consumption) points requirements and alleviate the anxiety about the range of electric vehicles, current vehicle development and design must consider solutions to reduce rolling resistance in order to reduce the fuel and power consumption of the entire vehicle.

[0003] The rear axle assembly mainly transmits power and bears the load of the entire vehicle. The resistance of the rear axle wheel side accounts for about 80% of the resistance of the rear axle assembly. If the resistance of the rear axle wheel side can be reduced, it will be very beneficial to the energy consumption of the vehicle. Utility Model Content

[0004] The present application provides an oil seal, a rear axle assembly and a vehicle to solve some or all of the deficiencies in the related art.

[0005] A first aspect of the present application provides an oil seal, comprising:

[0006] An annular skeleton, comprising an annular portion and a retaining portion; the annular portion extends parallel to the axis of the oil seal; an end of the retaining portion is connected to an end of the annular portion and extends toward the axis; the annular skeleton further comprises an inner surface and an outer surface arranged oppositely; the inner surface is arranged on a side of the annular portion facing the axis and on a side of the retaining portion facing the annular portion; and

[0007] A flexible sealing body comprises a sealing portion and a main body portion; the main body portion is arranged on the outer surface; the sealing portion is arranged on the inner surface and extends beyond the main body portion toward the axis; the end of the sealing portion away from the main body portion is used to connect with the rotating member; the main body portion is connected to the sealing portion and wraps the end of the blocking portion away from the ring portion.

[0008] Furthermore, the oil seal comprises a cavity; the cavity comprises a main cavity and a sub-cavity; the main cavity extends along the axis and is used to accommodate the rotating member; the sub-cavity is connected to the main cavity, and the wall surface coincides with the inner surface.

[0009] Further, the sealing portion includes a connecting portion arranged on the inner surface and a lip extending beyond the main body; the main body is connected to the connecting portion; one end of the lip is connected to the connecting portion, and the other end extends obliquely from the inner surface toward the outer surface; or, one end of the lip is connected to the connecting portion, and the other end extends obliquely from the inner surface away from the outer surface.

[0010] Furthermore, the connecting portion is arranged away from the ring portion; and in a radial direction from the inner surface to the outer surface, a thickness of the connecting portion gradually decreases.

[0011] Furthermore, the flexible sealing body further comprises a limiting portion; the limiting portion is arranged at one end of the flexible sealing body away from the ring portion and extends toward the axis; one end of the ring portion away from the blocking portion abuts against the limiting portion.

[0012] Furthermore, the main body includes a first surface parallel to the ring portion, a second surface parallel to the blocking portion, and an inclined surface connecting the first surface and the second surface; the first surface and the second surface are respectively arranged on a side of the main body away from the annular skeleton.

[0013] A second aspect of the present application provides a rear axle assembly, comprising a half-shaft, a bearing seat, a bearing and the oil seal described in the aforementioned embodiment; the bearing seat comprises a cavity and an opening connected to the cavity; the inner ring of the bearing is sleeved on the half-shaft, and the outer ring abuts against the inner wall of the cavity; the oil seal is sleeved on the half-shaft; the oil seal is arranged in the opening and abuts against the inner wall of the cavity.

[0014] Furthermore, the bearing also includes an end face perpendicular to the axis and a sealing ring arranged on the end face; the sealing ring is fixedly connected to the outer ring; in the radial direction of the sealing ring, there is a gap between the sealing ring and the inner ring.

[0015] Furthermore, the sealing portion is interference fit with the half shaft.

[0016] A third aspect of the present application provides a vehicle, comprising the rear axle assembly described in the aforementioned embodiment.

[0017] The technical solution provided by the embodiments of the present application may have the following beneficial effects:

[0018] It can be seen from the above embodiments that the structural strength of the oil seal of the present application can be significantly improved by providing an annular skeleton. When the rotating member is a high-speed rotating half-shaft, the half-shaft rotates at high speed relative to the bearing seat. At this time, the oil seal can also stably maintain contact with the inner wall of the cavity to avoid a decrease in sealing performance due to deformation. The sealing portion extends beyond the main body toward the axis, so the half-shaft and the oil seal are actually in contact through the sealing portion. Since the sealing portion is flexible and away from the annular skeleton, the degree of deformation is higher than that of the main body. During the rotation of the half-shaft, the sealing portion can produce appropriate deformation to adapt to the rotation of the half-shaft, thereby reducing the friction resistance between the half-shaft and the oil seal. Therefore, the cooperation of the annular skeleton and the flexible sealing body can avoid increasing the rotation resistance of the half-shaft while ensuring the structural strength of the oil seal.

[0019] It is to be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0021] Figure 1 A partial cross-sectional schematic diagram of an embodiment of a rear axle assembly of the present application is shown.

[0022] Figure 2 Shown as Figure 1 A partial enlarged schematic diagram of the oil seal position of the rear axle assembly is shown.

[0023] Figure 3 A partial cross-sectional schematic diagram of an embodiment of an oil seal of the present application is shown.

[0024] Description of Figure Numbers:

[0025] 100 rear axle assembly, 1 half shaft, 2 bearing seat, 21 cavity, 3 bearing, 31 inner ring, 32 outer ring, 33 end face, 34 sealing ring, 4 oil seal, 41 annular skeleton, 411 ring part, 412 blocking part, 413 inner surface, 414 outer surface, 42 flexible sealing body, 421 sealing part, 421a connecting part, 421b lip, 422 main body, 422a first surface, 422b second surface, 422c inclined surface, 423 limiting part, 43 cavity, 431 main cavity, 432 sub-cavity, 5 fasteners, A axis, X axial direction, Y radial direction. DETAILED DESCRIPTION

[0026] Exemplary embodiments will be described in detail herein, examples of which are shown in the accompanying drawings. When the following description refers to the drawings, the same numbers in different drawings represent the same or similar elements unless otherwise indicated. The methods described in the following exemplary embodiments do not represent all methods consistent with the present application. Instead, they are merely examples of devices consistent with some aspects of the present application as detailed in the appended claims.

[0027] The terms used in this application are only for the purpose of describing specific embodiments and are not intended to limit this application. Unless otherwise defined, the technical terms or scientific terms used in this application should be understood by people with ordinary skills in the field to which this application belongs. The words "first", "second" and similar words used in the specification and claims of this application do not indicate any order, quantity or importance, but are only used to distinguish different components. Similarly, similar words such as "one" or "one" do not indicate a quantitative limit, but indicate that there is at least one, and if only "one" is referred to, it will be separately described. "Multiple" or "several" means two or more. Unless otherwise specified, similar words such as "front", "rear", "lower" and / or "upper" are only for the convenience of explanation, and are not limited to one position or one spatial orientation. Similar words such as "include" or "comprise" mean that the elements or objects appearing in front of "include" or "comprise" cover the elements or objects listed after "include" or "comprise" and their equivalents, and do not exclude other elements or objects. "Connected" or "connected" and similar words are not limited to physical or mechanical connections, and may include electrical connections, whether direct or indirect. The singular forms "a", "said" and "the" used in this specification and the appended claims are also intended to include plural forms, unless the context clearly indicates otherwise. It should also be understood that the term "and / or" used herein refers to and includes any or all possible combinations of one or more associated listed items.

[0028] The present application provides a vehicle. The vehicle includes a rear axle assembly. Figure 1 As shown, the rear axle assembly 100 of the present application includes a half shaft 1, a bearing seat 2 and a bearing 3. The bearing seat 2 includes a cavity 21 and an opening connected to the cavity 21. The inner ring 31 of the bearing 3 is sleeved on the half shaft 1, and the outer ring 32 abuts against the inner wall of the cavity 21. The end of the half shaft 1 away from the bearing seat 2 can be connected to the wheel of the vehicle through a fastener 5, so as to transmit the driving force to the wheel. The setting of the bearing 3 can reduce the friction resistance when the half shaft 1 rotates, thereby reducing the fuel consumption and power consumption of the vehicle.

[0029] In order to reduce friction, the rear axle assembly 100 is provided with lubricants such as lubricating oil and lubricating paste in the bearing 3 and the cavity 21. In order to prevent the lubricant from leaking from the cavity 21, the rear axle assembly 100 also includes an oil seal 4 sleeved on the half shaft 1. The oil seal 4 is arranged at the opening and abuts against the inner wall of the cavity 21.

[0030] refer to Figure 2The oil seal 4 of the present application includes an annular skeleton 41 and a flexible sealing body 42. The annular skeleton 41 includes an annular portion 411 and a retaining portion 412. The annular skeleton 41 includes an annular portion 411 and a retaining portion 412. The annular portion 411 extends parallel to the axis A of the oil seal 4. The end of the retaining portion 412 is connected to the end of the annular portion 411 and extends toward the axis A. In this way, the cross-section of the annular skeleton 41 is as follows: Figure 2 The "L"-shaped knot is formed as shown. The annular skeleton 41 also includes an inner surface 413 and an outer surface 414 that are arranged opposite to each other. The inner surface 413 is arranged on the side of the ring portion 411 facing the axis A and the side of the stop portion 412 facing the ring portion 411. The flexible sealing body 42 includes a sealing portion 421 and a main body portion 422. The main body portion 422 is arranged on the outer surface 414. The sealing portion 421 is arranged on the inner surface 413 and extends beyond the main body portion 422 toward the axis A. The main body portion 422 is connected to the sealing portion 421 and wraps around one end of the stop portion 412 away from the ring portion 411. Among them, the end of the sealing portion 421 away from the main body portion 422 is connected to the semi-shaft 1.

[0031] By providing the annular skeleton 41, the structural strength of the oil seal 4 can be significantly improved. When the half shaft 1 rotates at high speed relative to the bearing seat 2, the oil seal 4 can also stably maintain contact with the inner wall of the cavity 21 to avoid the reduction of the sealing performance due to deformation. The sealing portion 421 extends beyond the main body 422 toward the axis A, so the half shaft 1 and the oil seal 4 are actually in contact through the sealing portion 421. Since the sealing portion 421 is flexible and far away from the annular skeleton 41, the degree of deformation is higher than that of the main body 422. During the rotation of the half shaft 1, the sealing portion 421 can produce appropriate deformation to adapt to the rotation of the half shaft 1. Compared with the scheme in which the main body 422 contacts and seals the half shaft 1, the contact between the sealing portion 421 and the half shaft can reduce the friction resistance between the half shaft 1 and the oil seal 4. Therefore, the cooperation between the annular skeleton 41 and the flexible sealing body 42 can avoid increasing the rotation resistance of the half shaft 1 while ensuring the structural strength of the oil seal 4.

[0032] For the sake of simplicity, the drawings in the specification set the axial direction X and the radial direction Y as reference directions. The axis A is parallel to the axial direction X. The radial direction Y is shown in the drawings as being perpendicular to the axial direction X. However, in reality, the radial direction Y may be at other angles to the axial direction X.

[0033] Further, in an optional embodiment, the sealing portion 421 is interference fit with the half shaft 1. The interference fit can maintain the contact between the half shaft 1 and the oil seal 4, so as to prevent the viscosity of the lubricant from decreasing and flowing out from the gap between the half shaft 1 and the oil seal 4 due to the rotation speed and temperature of the half shaft 1 during the rotation process. In order to reduce the friction resistance between the half shaft 1 and the oil seal 4, the wall thickness of the sealing portion 421 can be gradually reduced in the direction of the radial direction Y pointing to the axis A, such as Figure 2As shown, the portion of the sealing portion 421 facing the half shaft 1 has a higher degree of deformability than the portion away from the half shaft 1 , which is beneficial to reducing the rotational resistance of the oil seal 4 to the half shaft 1 .

[0034] like Figure 3 As shown, the sealing portion 421 includes a connecting portion 421a provided on the inner surface 413 and a lip 421b extending beyond the main body 422. One end of the lip 421b is connected to the connecting portion 421a, and the other end extends obliquely from the inner surface 413 toward the outer surface 414. Alternatively, one end of the lip 421b is connected to the connecting portion 421a, and the other end extends obliquely from the inner surface 413 away from the outer surface 414. When the oil seal 4 is assembled to the rear axle assembly 100, the lip 421b contacts the half shaft 1. The connecting portion 421a is connected to the inner surface 413 and is connected to the main body 422. In this way, the flexible sealing body 42 can wrap the end of the stopper 412 away from the ring portion 411. When the half shaft 1 rotates, even if the lip 421b is subjected to the friction generated by the rotation and the pressure of the lubricant, the flexible sealing body 42 can still maintain the connection with the annular skeleton 41. The inclined design of the lip 421b can improve the sealing effect when the flexible sealing body 42 is in interference fit with the half shaft 1. Compared with the solution extending along the radial direction Y, the inclined lip 421b has better flexibility and a better sealing effect.

[0035] In some embodiments, the connection portion 421a is arranged away from the ring portion 411, and the thickness of the connection portion 421a gradually decreases in the radial direction Y from the inner surface 413 to the outer surface 414. This arrangement allows a gap to exist between the sealing portion 421 and the ring portion 411, making it easier to assemble the stopper 412 with the flexible sealing body 42. In addition, the gradually decreasing thickness can also improve the flexibility of the side of the connection portion 421a away from the lip, making it easier to bend the flexible sealing body 42 to install the stopper 412.

[0036] In one embodiment, the flexible sealing body 42 also includes a limiting portion 423. The limiting portion 423 is disposed at one end of the flexible sealing body 42 away from the ring portion 411 and extends toward the axis A. One end of the ring portion 411 away from the stop portion 412 abuts against the limiting portion 423. The provision of the limiting portion 423 enables the annular skeleton 41 to maintain a constant relative position with the flexible sealing body 42 in the axial direction X. In this way, the force generated on the oil seal 4 when the half shaft 1 rotates at high speed will hardly cause the flexible sealing body 42 and the annular skeleton 41 to separate, which is conducive to ensuring the reliable sealing of the oil seal 4. In an embodiment in which the sealing portion 421 includes a connecting portion 421a, the cooperation of the connecting portion 421a and the limiting portion 423 can limit the two-way relative movement of the annular skeleton 41 in the axial direction X, further improving the stability of the structure.

[0037] Combination Figure 2 and Figure 3, the oil seal 4 includes a cavity 43. In some embodiments, the cavity 43 includes a main cavity 431 and a sub-cavity 432. The main cavity 431 extends along the axis A and is used to accommodate the half shaft 1. The sub-cavity 432 is connected to the main cavity 431, and the wall surface coincides with the inner surface 413. In other words, the sub-cavity 432 and the main cavity 431 are directly connected in the radial direction Y without any other shielding structure. Compared with the scheme in which the sub-cavity 432 and the main cavity 431 are not connected in the radial direction Y, the volume of the flexible seal 42 of the present application is reduced. In addition, in the scheme in which the sub-cavity 432 and the main cavity 431 are not connected in the radial direction Y, the flexible seal 42 usually has multiple positions to abut and seal with the half shaft 1. In the present application, only the sealing portion 421 abuts and seals with the half shaft 1, so the friction resistance between the oil seal 4 and the half shaft 1 is significantly reduced. In this way, the resistance of the rear axle assembly 100 at the wheel edge can be effectively reduced, thereby reducing the energy consumption of the vehicle.

[0038] In addition, in some technical solutions, the oil seal 4 is provided with a spring connected to the flexible sealing body 42. The spring can clamp the oil seal 4 on the half shaft 1 through the shaft holding force, so that the oil seal 4 has better sealing performance. However, the sub-cavity 432 of this embodiment is directly connected to the main cavity 431, and no spring or other structures are provided. Therefore, the shaft holding force of the oil seal 4 on the half shaft 1 of the present application can be reduced, and the friction between the oil seal 4 and the half shaft 1 can be further controlled.

[0039] It should be noted that the main cavity 431 extends along the axis A, which means that the axis of the main cavity 431 is collinear with the axis A. Thus, when the half-shaft 1 is accommodated in the main cavity 431, the rotation axis of the half-shaft 1 is also collinear with the axis A. The parallel to the axis A described in the embodiment of the present application can be understood as collinear with the axis A, or can be understood as parallel to the axis A but not collinear.

[0040] In this embodiment, in order to further improve the sealing performance of the rear axle assembly 100, the bearing 3 also includes an end face 33 perpendicular to the axis A and a sealing ring 34 arranged on the end face 33. Among them, the sealing ring 34 is fixedly connected to the outer ring 32. In this embodiment, the bearing 3 itself can play a certain role in sealing the lubricant. Through such a configuration, the number of sealing parts 421 of the oil seal 4 of the present application can be reduced, but the sealing effect of the rear axle assembly 100 for the lubricant can still be guaranteed to a certain extent. The reduction in the number of sealing parts 421 can correspondingly reduce the friction resistance between the half-axle 1 and the oil seal 4. In this way, the electrical loss and oil loss of the vehicle are effectively reduced.

[0041] Furthermore, in the radial direction Y of the sealing ring 34, there is a gap between the sealing ring 34 and the inner ring 31. Since the sealing ring 34 is fixedly connected to the outer ring 32, the sealing ring 34 itself acts as a fixed part and moves relative to the rotating inner ring 31. There is a gap between the sealing ring 34 and the inner ring 31, so during the rotation of the inner ring 31, no friction force is generated between the sealing ring 34 and the inner ring 31. In this way, the friction resistance of the rear axle assembly 100 can be further reduced.

[0042] refer to Figure 3 The main body 422 includes a first surface 422a parallel to the ring portion 411 and a second surface 422b parallel to the stopper 412. The first surface 422a and the second surface 422b are respectively arranged on one side of the main body 422 away from the annular frame 41. Figure 3 Taking the embodiment shown as an example, the second surface 422b of the main body 422 parallel to the stopper 412 is respectively located on both sides of the first direction X. In each of the above embodiments, the main body 422 further includes an inclined surface 422c connecting the first surface 422a and the second surface 422b. In other words, a chamfer is provided on one side of the main body 422 that contacts the bearing seat 2. The chamfer is provided to facilitate the assembly of the oil seal 4 in the cavity 21.

[0043] Figure 3 In the illustrated embodiment, the inclined surface 422c includes two second surfaces 422b respectively disposed on both sides of the first direction X. However, this should be understood as illustrative rather than restrictive. The inclined surface 422c may be disposed only on the second surface 422b on one side in the first direction X. The present application does not limit this.

[0044] The seal 4 described in the above embodiment is assembled in the rear axle assembly 100 and cooperates with the half shaft 1. However, in fact, the seal 4 can also be assembled in any rotating structure that isolates lubricant and air, such as a screw pump, etc. This application is not limited to this.

[0045] The specific embodiments described herein are merely examples of the spirit of the present application. A person skilled in the art of the present application may make various modifications, supplements, or replace the described specific embodiments with similar methods, but they will not deviate from the spirit of the present application or exceed the scope defined by the attached claims.

[0046] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

Claims

1. An oil seal, characterized in that: include: An annular skeleton, comprising an annular portion and a retaining portion; the annular portion extends parallel to the axis of the oil seal; The end of the stopper is connected to the end of the ring and extends toward the axis; the annular skeleton further comprises an inner surface and an outer surface arranged opposite to each other; the inner surface is arranged on a side of the ring facing the axis and a side of the stopper facing the ring; as well as A flexible sealing body, comprising a sealing portion and a main body; the main body is arranged on the outer surface; The sealing portion is disposed on the inner surface and extends beyond the main body portion toward the axis; One end of the sealing portion away from the main body portion is used to be connected to the rotating member; the main body portion is connected to the sealing portion and wraps one end of the blocking portion away from the ring portion.

2. The oil seal according to claim 1, characterized in that: The oil seal comprises a cavity; the cavity comprises a main cavity and a sub-cavity; the main cavity extends along the axis and is used to accommodate the rotating member; the sub-cavity is connected to the main cavity, and the wall surface coincides with the inner surface.

3. The oil seal according to claim 1, characterized in that: The sealing portion includes a connecting portion arranged on the inner surface and a lip extending beyond the main body; the main body is connected to the connecting portion; one end of the lip is connected to the connecting portion, and the other end extends obliquely from the inner surface toward the outer surface; or, one end of the lip is connected to the connecting portion, and the other end extends obliquely from the inner surface away from the outer surface.

4. The oil seal according to claim 3, characterized in that: The connecting portion is arranged away from the ring portion; and the thickness of the connecting portion gradually decreases in a radial direction from the inner surface to the outer surface.

5. The oil seal according to claim 1, characterized in that: The flexible sealing body further comprises a limiting portion; the limiting portion is arranged at one end of the flexible sealing body away from the ring portion and extends toward the axis; one end of the ring portion away from the blocking portion abuts against the limiting portion.

6. The oil seal according to any one of claims 1 to 5, characterized in that: The main body comprises a first surface parallel to the ring portion, a second surface parallel to the stopper portion, and an inclined surface connecting the first surface and the second surface; the first surface and the second surface are respectively arranged on a side of the main body away from the annular skeleton.

7. A rear axle assembly, characterized in that: It comprises a half-shaft, a bearing seat, a bearing and an oil seal as described in any one of claims 1 to 6; the bearing seat comprises a cavity and an opening connected to the cavity; the inner ring of the bearing is sleeved with the half-shaft, and the outer ring abuts against the inner wall of the cavity; the oil seal is sleeved with the half-shaft; the oil seal is arranged in the opening and abuts against the inner wall of the cavity.

8. The rear axle assembly according to claim 7, characterized in that: The bearing further comprises an end face perpendicular to the axis and a sealing ring arranged on the end face; the sealing ring is fixedly connected to the outer ring; in the radial direction of the sealing ring, there is a gap between the sealing ring and the inner ring.

9. The rear axle assembly according to claim 7 or 8, characterized in that: The sealing portion is interference fit with the half shaft.

10. A vehicle, characterized in that: Comprising a rear axle assembly as described in any one of claims 8-9.

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