Oil seal device, electric drive system and vehicle

Abstract

The invention discloses an oil seal device, an electric drive system and a vehicle, the oil seal device comprises a first sealing piece, the first sealing piece comprises an inclined section used for sealing, the first sealing piece comprises an oil leaning end and an outer leaning end arranged opposite to the oil leaning end in the axial direction of the first sealing piece, and the inclined section is provided with an inclined section used for sealing; in the direction from the radial outer side to the radial inner side of the first sealing piece, the inclined section obliquely extends from the oil leaning end to the outer leaning end in the axial direction of the first sealing piece, after the oil sealing device is installed, the sealing capacity in negative pressure can be effectively improved, and the problem of oil leakage is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of automobiles, and particularly to an oil seal device, an electric drive system, and a vehicle. Background Art

[0002] With the popularization of electric vehicles, the reliability problem of the electric drive system has received increasing attention. Since a large amount of heat is generated when the electric drive system of an electric vehicle is working, an effective sealing structure is required to ensure the normal operation of the electric drive system.

[0003] During the operation of the electric drive system, the temperature inside the electric drive housing is relatively high. If the vehicle passes through a waterlogged road surface, after the cold water contacts the electric drive housing, the inside of the electric drive housing is quickly cooled, and the pressure inside the electric drive housing drops sharply, which may cause a negative pressure situation inside the cavity. In this case, there is a risk that the lip of the seal of the oil seal device is lifted by the pressure at the outer end, thereby causing an oil leakage problem.

[0004] Therefore, it is necessary to design an oil seal device, an electric drive system, and a vehicle to avoid the problem of oil leakage. Summary of the Invention

[0005] The purpose of the present invention is to overcome the deficiencies of the prior art and provide an oil seal device, an electric drive system, and a vehicle. After the oil seal device is installed, it can effectively improve the negative pressure resistance and avoid the problem of oil leakage.

[0006] According to a first aspect of the present invention, an oil seal device is provided, which includes a first seal. The first seal contains an inclined section for sealing. In the axial direction of the first seal, the first seal has an oil-side end and an outer-side end opposite to the oil-side end. In the direction from the radial outside to the inside of the first seal, the inclined section extends in an inclined manner from the oil-side end to the outer-side end in the axial direction of the first seal.

[0007] In one embodiment, a first skeleton is further included. The first seal further contains a fixed section and a connecting section that are far from the inclined section in the radial direction of the first seal. The connecting section is located between the fixed section and the inclined section and is respectively connected to the inclined section and the fixed section. An arc-shaped groove is provided on the side wall of the outer-side end of the connecting section. Wherein, the first seal is connected to the first skeleton through the fixed section.

[0008] In one embodiment, the inclination angle of the inclined section is 15 to 35 degrees, where the inclination angle refers to the angle formed between the extending direction of the inclined section and the axis of the first seal.

[0009] In one embodiment, it further includes a second skeleton and a second seal provided on the second skeleton. In the axial direction of the first seal, the second skeleton is located at the outer end of the first skeleton. The second seal includes a shaft seal portion located at the outer end of the first seal. Moreover, the first skeleton, the second skeleton, the second seal and the first seal enclose to form a cavity.

[0010] In one embodiment, the first skeleton includes a first cylinder and a first ring fixedly connected to the first cylinder. The second skeleton includes a second cylinder and a second ring fixedly connected to the second cylinder. The first seal is provided on the first ring, and the second seal is provided on the second ring. The first cylinder is relatively sleeved into the second cylinder, and the first ring and the second ring are spaced apart in the axial direction of the first seal to form the cavity.

[0011] In one embodiment, a rubber cylinder is provided on the inner wall of the second cylinder, and the first cylinder is in interference fit with the rubber cylinder.

[0012] In one embodiment, a clamping belt is provided on one of the inner wall of the rubber cylinder and the outer wall of the first cylinder, and a clamping groove for matching with the clamping belt is provided on the other.

[0013] In one embodiment, in the axial direction of the first seal, the shaft seal portions are multiple and spaced apart; a housing seal portion is provided on the outer wall of the second cylinder.

[0014] According to a second aspect of the present invention, there is provided an electric drive system, including:

[0015] An electric drive housing,

[0016] A rotating shaft inserted into the electric drive housing,

[0017] The above oil seal device, which is provided between the rotating shaft and the electric drive housing, and the inclined section abuts against the rotating shaft.

[0018] According to a third aspect of the present invention, there is provided a vehicle, including the above electric drive system.

[0019] Adopting the above technical solution, the following beneficial effects are achieved: The oil seal device includes a first seal. After installation, the first seal abuts against the outer wall of the rotating shaft to form a seal. In the case of negative pressure inside the electric drive housing, that is, under the positive pressure at the outer end, the pressure acts on the inclined section. Since the first seal has an inclined section facing the outer end, it is very difficult for the first seal to be lifted. In particular, during the compression of the inclined section, a component force is generated to press the first seal more tightly against the rotating shaft, improving the sealing effect. It can be seen that the first seal can prevent the oil seal device from being lifted, thereby avoiding the problem of oil leakage. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Referring to the drawings, the disclosure of the present invention will become more readily understood. It should be understood that these drawings are for illustrative purposes only and are not intended to limit the scope of protection of the present invention. In the figures:

[0021] Figure 1 shows a partial axial sectional view of the oil seal device according to an embodiment of the present invention;

[0022] Figure 2 shows the application of the oil seal device according to an embodiment of the present invention in an electric drive system.

[0023] In the drawings, the same components are denoted by the same reference numerals. The drawings are not drawn to actual scale. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0024] The following further describes the specific embodiments of the present invention with reference to the drawings.

[0025] An embodiment of the present invention provides an oil seal device. As Figure 1 shown, the oil seal device 100 includes a first seal 1. The first seal 1 includes an inclined section 11. In the direction from the radially outer side to the inner side of the first seal 1, the inclined section 11 extends obliquely from the oil-facing end to the outer end in the axial direction of the first seal 1. Wherein, the outer end is opposite to the oil-facing end in the axial direction of the first seal. In Figure 1 it, the radial direction of the first seal 1 is consistent with the up-and-down direction, the axial direction of the first seal 1 is consistent with the left-and-right direction, the oil-facing end is consistent with the right-end direction, and the outer end is consistent with the left-end direction.

[0026] During use, as Figure 2As shown, the oil seal device 100 is applied between the electric drive housing 200 and the rotating shaft 300 to seal the gap therebetween. Specifically, the first seal 1 abuts against the outer wall of the rotating shaft 300 to form a seal. In the case of negative pressure inside the electric drive housing 200, i.e., positive pressure at the outer end, the pressure acts on the inclined section 11. Since the first seal 1 has an inclined section 11 facing the outer end, it is difficult for the first seal 1 to be lifted to contact the seal with the rotating shaft 300. In particular, the component force generated during the compression of the inclined section 11 presses the first seal 1 more tightly against the rotating shaft 300, further improving the sealing effect. It can be seen that through the first seal 1, the problem of the oil seal device 100 failing to seal the rotating shaft 300 can be effectively avoided, thereby avoiding oil leakage.

[0027] In one embodiment, the oil seal device 100 further includes a first skeleton 2. At the same time, the first seal 1 also includes a fixed section 12 and a connecting section 13. Among them, the first skeleton 2 is used to connect with the first seal 1 and play a role in supporting the first seal 1 to improve the stiffness and structural forming effect of the first seal 1. Specifically, the fixed section 12 is used to connect to the first skeleton 2. That is to say, the fixed section 12 mainly plays a connecting role to connect the first seal 1 to the first skeleton 2. The connecting section is arranged between the fixed section 12 and the inclined section 11. According to the present application, an arc-shaped groove 14 is provided on the connecting section 13. The arc-shaped groove 14 is provided on the side wall of the outer end of the connecting section 13, that is to say, the arc-shaped groove 14 is provided on the left side wall of the connecting section 13. By providing the arc-shaped groove 14, the axial thickness of the connecting section 13 is thinned to form a waist. In the case of negative pressure inside the electric drive housing 200, i.e., positive pressure at the outer end, the connecting section 13 is easily deformed to absorb energy. In particular, during the deformation of the connecting section 13, a component force that presses the first seal 1 towards the rotating shaft 300 is also generated, which is used to increase the friction force between the first seal 1 and the rotating shaft 300, thereby improving the sealing effect of the first seal 1 for sealing the rotating shaft 300.

[0028] A circular chamfer is provided on the fixed section 12 for a smooth transition connection with the arc-shaped groove 14. It can be understood that the radius of the arc where the arc-shaped groove 14 is located is larger than the radius of the arc where the chamfer of the fixed section 12 is located. This setting can optimize the self-structure of the first seal 1, improve its self-life, and also help to better form a waist to ensure the self-design purpose of the connecting section 13.

[0029] The inclination angle of the inclined section 11 is 15 to 35 degrees. The inclination angle refers to the angle formed between the extending direction of the inclined section 11 and the axial direction of the rotating shaft 300. Figure 1In it, it is identified by α. For example, the inclination angle can be 25 degrees. This setting can ensure a certain contact area between the inclined section 11 and the rotating shaft 300, effectively avoiding the wear of the first seal 1 during dynamic sealing, and correspondingly extending the service life and sealing durability of the first seal 1; at the same time, it can also effectively ensure the friction force between the first seal 1 and the rotating shaft 300, improving the sealing effect of the first seal 1 for sealing the rotating shaft 300.

[0030] The oil seal device 100 further includes a second skeleton 3 and a second seal 4. The second seal 4 is arranged on the second skeleton 3. That is to say, the second skeleton 3 can play a role in supporting the second seal 4 to ensure the forming effect of the second seal 4. In the axial direction of the first seal 1, the second skeleton 3 is located at the outer end of the first skeleton 2, and the second seal 4 is located at the outer end of the first seal 1. The first skeleton 2, the second skeleton 3, the second seal 4 and the first seal 1 enclose to form a cavity 5. By setting the second seal 4, the sealing at the rotating shaft 300 can be further ensured. In particular, the second seal 4 is arranged on the outer end side of the first seal 1, which can effectively protect the first seal 1. Whether in the case of negative pressure or positive pressure in the electric drive housing 200, the second seal 4 can play the role of sealing the rotating shaft 300.

[0031] More specifically, the first skeleton 2 includes a first cylinder 21 and a first ring 22, and the first cylinder 21 and the first ring 22 are fixedly connected to each other. The second skeleton 3 includes a second cylinder 31 and a second ring 32, and the second cylinder 31 and the second ring 32 are fixedly connected to each other. The first seal 1 is arranged on the first ring 22. The second seal 4 is arranged on the second ring 32. The first cylinder 21 is relatively sleeved into the second cylinder 31, and the first ring 22 and the second ring 32 are spaced apart in the axial direction of the first seal 1. Thus, the first skeleton 2, the second skeleton 3, the second seal 4 and the first seal 1 enclose to form a cavity 5. The second seal 4 includes a shaft sealing portion 41, and in the axial direction of the first seal 1, the shaft sealing portion 41 is spaced apart from the inclined section 11. During use, the shaft sealing portion 41 abuts against the rotating shaft 300 to play a sealing role. When there is positive pressure at the oil end and negative pressure at the outer end, the inclined section 11 is easily lifted under a certain pressure, and then contacts the sealing between the first seal 1 and the rotating shaft 300. At this time, the oil in the electric drive housing 200 can enter the cavity 5 through the gap between the first seal 1 and the rotating shaft 300. At this time, the shaft sealing portion 41 can be closely attached to the rotating shaft 300 to achieve a sealing effect. It can be seen that by setting the cavity 5, it can play a role in guiding the oil to enter, thereby reducing the pressure in the original electric drive housing 200 and ensuring sealing safety. At the same time, the oil entering the cavity 5 plays a lubricating role for the shaft sealing portion 41, plays a role in maintaining the second seal 4, and is used to improve the service life of the second seal 4.

[0032] A rubber cylinder 43 is adhesively provided on the inner wall of the second cylinder 31. The first cylinder 21 is in interference fit with the rubber cylinder 43. That is to say, the rubber cylinder 43 is clamped between the second cylinder 31 and the first cylinder 21. On the one hand, by providing the rubber cylinder 43 and having an interference fit with the first skeleton 2, the stable installation of the first skeleton 2 can be ensured; on the other hand, by providing the rubber cylinder 43, the sealing between the second cylinder 31 and the first cylinder 21 can be ensured. Preferably, a clamping belt 44 is protrusively provided on the inner wall of the rubber cylinder 43, and a clamping groove 23 for matching with the clamping belt 44 is provided on the outer wall of the first cylinder 21. After connection, the clamping belt 44 is clamped into the clamping groove 23 to ensure the stability of the connection between the second cylinder 31 and the first cylinder 21. It can be understood that the positions of the clamping belt 44 and the clamping groove 23 can be interchanged, that is, the clamping belt 44 is provided on the outer wall of the first cylinder 21, and the clamping groove 23 can be provided on the inner wall of the rubber cylinder 43. This setting can also play a role in improving the connection stability.

[0033] The first seal 1 further includes an extension portion 15 which extends to the first ring 22 of the first skeleton 2. The extension portion is integrally connected to the fixed section 12, the connecting section 13 and the inclined section 11, and is used to increase the contact area between the first seal 1 and the first ring 22 to ensure that the first seal 1 can be stably connected to the first skeleton 2. For example, the first seal 1 can be made of rubber material and can be provided on the first skeleton 2 by vulcanization. The second seal 4 can also be made of rubber material and is provided on the second skeleton 3 by vulcanization. In addition, the second seal 4 further includes a housing sealing portion 42. The housing sealing portion 42 is provided on the outer wall of the second cylinder 31 and is also in a cylindrical shape. After the oil seal device 100 is installed, the housing sealing portion 42 abuts against the electric drive housing 200 to play a sealing role. Preferably, the shaft sealing portion 41 and the housing sealing portion 42 are integrally connected.

[0034] There can be multiple shaft sealing portions 41, for example, three, and they are distributed at intervals in the axial direction.

[0035] For example, the two outermost shaft sealing portions 41 in the shaft sealing portion 41 are also configured to be inclined, and their sealing principle is substantially the same as that of the inclined section 11. They can also play a good sealing effect under the negative pressure condition in the electric drive housing 200. These two shaft sealing portions 41 not only have a good sealing effect themselves, but also can protect the other shaft sealing portion 41 and the inclined section 11 under the negative pressure condition in the electric drive housing 200. The inclination angle β of these two shaft sealing portions 41 is generally 40 - 60 degrees, for example, 45 degrees. Whether the pressure in the electric drive housing 200 is positive or negative, this setting can ensure that these two shaft sealing portions 41 can both play a good sealing effect.

[0036] In addition, one of the oil-side sections in the shaft seal section 41 is Figure 1 substantially triangular in the axial cross-section, and one corner of the triangle faces the rotating shaft 300. The sealing end of such an angled shaft seal section 41 is prone to deformation and can be well pressure-contact with the rotating shaft 300 to ensure a good sealing effect. In particular, since it is located at the oil-side end, it can effectively prevent the pressure from the oil-side end from lifting the shaft seal section 41 under the positive pressure condition inside the electric drive housing 200, ensuring sealing.

[0037] The design of multiple shaft seal sections 41 is optimized to ensure a good sealing effect.

[0038] In this application, an electric drive system is also involved. As Figure 2 shown, the electric drive system includes an electric drive housing 200, a rotating shaft 300, and an oil seal device 100. Among them, the oil seal device 100 is arranged between the rotating shaft 300 and the electric drive housing 200 and mainly functions as a seal. More specifically, the inclined section 11 of the first seal 1 abuts against the rotating shaft 300. The inclined section 11 forms a sealing lip protruding towards the outer end, which clings to the rotating shaft 300 to achieve sealing. At the same time, multiple shaft seal sections 41 also abut against the rotating shaft 300 to form a seal. And the shaft seal sections 41 are axially spaced on the outer end side of the inclined section 11. Under the condition of negative pressure at the oil-side end, that is, positive pressure at the outer end side, the structure of the inclined section 11 clings to the rotating shaft 300 under the action of the positive pressure at the outer end to form a dynamic sealing surface, preventing oil from leaking to the outer end side; when there is positive pressure at the oil-side end, that is, negative pressure at the outer end side, the inclined section 11 lifts, and oil enters the cavity 5. At this time, by the shaft seal sections 41 clinging to the rotating shaft 300, a dynamic sealing surface is formed to prevent oil from further leaking outside the electric drive housing 200.

[0039] This invention also relates to a vehicle. The vehicle includes the above-mentioned electric drive system.

[0040] In the description of the present invention, it should be noted that unless otherwise specified, the meaning of "a plurality of" is two or more; the terms "inner" and "outer" respectively refer to the directions towards or away from the geometric center of a specific component. In addition, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0041] The above are only the principles and preferred embodiments of the present invention. It should be pointed out that for those of ordinary skill in the art, based on the principles of the present invention, several other variations can also be made, which should also be regarded as the protection scope of the present invention.

Claims

1. An oil seal device, characterized in that, It includes a first seal. The first seal contains an inclined section for sealing. In the axial direction of the first seal, the first seal has an oil-side end and an outer-side end disposed opposite to the oil-side end. In the direction from the radial outside to the inside of the first seal, the inclined section extends in an inclined manner from the oil-side end to the outer-side end in the axial direction of the first seal.

2. The oil seal device according to claim 1, characterized in that, It further includes a first skeleton. The first seal also contains a fixed section and a connecting section away from the inclined section in the radial direction of the first seal. The connecting section is located between the fixed section and the inclined section and is respectively connected to the inclined section and the fixed section. An arc-shaped groove is provided on the side wall of the outer-side end of the connecting section. Wherein, the first seal is connected to the first skeleton through the fixed section.

3. The oil seal device according to claim 2, characterized in that, The inclination angle of the inclined section is 15 to 35 degrees. Wherein, the inclination angle refers to the included angle formed between the extending direction of the inclined section and the axis of the first seal.

4. The oil seal device according to claim 2 or 3, characterized in that, It further includes a second skeleton and a second seal provided on the second skeleton. In the axial direction of the first seal, the second skeleton is located at the outer-side end of the first skeleton. The second seal contains a shaft seal portion located at the outer-side end of the first seal. And, the first skeleton, the second skeleton, the second seal and the first seal enclose to form a cavity.

5. The oil seal device according to claim 4, characterized in that, The first skeleton contains a first cylinder and a first ring fixedly connected to the first cylinder. The second skeleton contains a second cylinder and a second ring fixedly connected to the second cylinder. The first seal is provided on the first ring. The second seal is provided on the second ring. The first cylinder is relatively sleeved into the second cylinder. The first ring and the second ring are spaced apart in the axial direction of the first seal to form the cavity.

6. The oil seal device according to claim 5, characterized in that, A rubber cylinder is provided on the inner wall of the second cylinder. The first cylinder is in interference fit with the rubber cylinder.

7. The oil seal device according to claim 6, characterized in that, A clamping belt is provided on one of the inner wall of the rubber cylinder and the outer wall of the first cylinder, and a clamping groove for matching with the clamping belt is provided on the other.

8. The oil seal device according to any one of claims 5 to 7, characterized in that, In the axial direction of the first seal, the shaft seal portions are multiple and are spaced apart. A housing seal portion is provided on the outer wall of the second cylinder.

9. An electric drive system, characterized in that, It includes: An electric drive housing, A rotating shaft inserted into the electric drive housing, The oil seal device according to any one of claims 1 to 8. The oil seal device is provided between the rotating shaft and the electric drive housing, and the inclined section abuts against the rotating shaft.

10. A vehicle, characterized in that, It includes the electric drive system according to claim 9.

Images