New energy vehicles and their drive systems

Abstract

The present invention relates to a new energy vehicle and a drive system thereof. The drive system comprises a housing, a reducer shaft, a motor shaft, a first sealing portion and a sealing structure. After the oil from the inner cavity of the reducer leaks from the first sealing portion, it flows to the oil tank from the gap between the first sealing portion and the reducer shaft. Since the distance from one end of the inner wall of the first blocking portion close to the housing to the central axis of the reducer shaft is greater than the distance from the first side wall to the central axis of the reducer shaft, when the oil flows from the gap between the first sealing portion and the reducer shaft to the oil tank, the first blocking portion can block the oil from advancing along the axial direction of the reducer shaft, and the oil will fall into the oil tank under the action of gravity, and the second side wall can block the oil falling into the oil tank from flowing to the motor shaft, so that the oil is stored in the oil tank, thereby reducing or avoiding the oil in the reducer from flowing into the motor, improving the sealing effect of the drive system, improving the lubrication effect of the reducer, and improving the working performance of the motor.

Description

Technical Field

[0001] The present invention relates to the technical field of gearboxes, and in particular to new energy vehicles and drive systems thereof. Background Art

[0002] Integrated drive system is an important development trend of electric vehicle drive system. The integrated drive system integrates the motor and reducer into one housing to realize the integration of the vehicle drive device. Since the gear shaft and other parts of the reducer need lubricating oil for lubrication, and there must be no oil in the motor. In order to prevent the lubricating oil in the reducer from entering the motor, an oil sealing device is generally set between the reducer and the motor. The oil sealing device is usually a sealing ring set on the intermediate shaft between the reducer and the motor.

[0003] However, when the integrated drive system is working, the seal ring and the intermediate shaft always maintain relative motion, which not only affects the service life of the seal ring, but also makes it inevitable that the oil between the seal ring and the intermediate shaft will leak into the motor due to the wear of the seal ring, which greatly affects the working performance and service life of the motor. Therefore, the sealing effect of the traditional oil sealing device is not good, which makes the sealing effect of the integrated drive system poor. Summary of the invention

[0004] Based on this, it is necessary to provide a new energy vehicle and its drive system with good sealing effect to address the problem that the traditional oil sealing device has poor sealing effect, which makes the sealing effect of the integrated drive system poor.

[0005] The present application provides a drive system, comprising:

[0006] case;

[0007] A reducer shaft is disposed in the housing;

[0008] A motor shaft is disposed in the housing, and the motor shaft is coaxially connected to the reducer shaft;

[0009] A first sealing portion, located between the reducer shaft and the housing, the first sealing portion being sealed and connected to the reducer shaft and the housing respectively; and

[0010] A sealing structure, wherein the sealing structure has an oil groove, wherein the oil groove is formed between the first sealing portion and the motor shaft, wherein the oil groove has a first side wall and a second side wall, wherein the second side wall is located on a side of the first side wall close to the motor shaft, wherein the sealing structure includes a first blocking portion located in the oil groove, wherein the first blocking portion is fixedly connected to a side surface of the reducer shaft, wherein the first blocking portion protrudes from the side surface of the reducer shaft, and wherein a distance from one end of the first blocking portion close to the inner wall of the housing to the central axis of the reducer shaft is greater than a distance from the first side wall to the central axis of the reducer shaft.

[0011] The above-mentioned drive system includes a housing, a reducer shaft, a motor shaft, a first sealing part and a sealing structure. After the oil from the inner cavity of the reducer leaks from the first sealing part, it flows from the gap between the first sealing part and the reducer shaft to the oil tank. Since the distance from the end of the inner wall of the first blocking part close to the housing to the central axis of the reducer shaft is greater than the distance from the first side wall to the central axis of the reducer shaft, when the oil flows from the gap between the first sealing part and the reducer shaft to the oil tank, the first blocking part can block the oil from moving along the axial direction of the reducer shaft, and the oil will fall into the oil tank under the action of gravity, and the second side wall can block the oil falling into the oil tank from flowing toward the motor shaft, so that the oil is stored in the oil tank, thereby reducing or avoiding the oil in the reducer from flowing into the motor, improving the sealing effect of the drive system, improving the lubrication effect of the reducer, and improving the working performance of the motor.

[0012] In one embodiment, the sealing structure also includes a second blocking portion, which is fixedly connected to the inner wall of the shell, and the second blocking portion is located at an end of the motor shaft close to the first sealing portion, the second blocking portion, the inner wall of the shell and the first sealing portion form the oil groove, the surface of the second blocking portion close to the first sealing portion forms the second side wall, and the surface of the first sealing portion close to the second side wall forms the first side wall.

[0013] In one embodiment, a distance from the second side wall to the central axis of the reducer shaft is smaller than a distance from the first side wall to the central axis of the reducer shaft.

[0014] In one embodiment, the distance from the second side wall to the central axis of the reducer is smaller than the radius of the reducer shaft at the first blocking portion.

[0015] In one embodiment, the diameter of the reducer shaft gradually decreases from the first sealing portion to the second blocking portion.

[0016] In one embodiment, the second blocking portion is integrally formed with the housing.

[0017] In one embodiment, the first blocking portion is a blocking ring.

[0018] In one embodiment, the first sealing portion is a lip sealing ring.

[0019] In one embodiment, the driving system comprises:

[0020] A reducer bearing, wherein the reducer is connected to the inner wall of the housing via the reducer bearing; and / or

[0021] A motor bearing, wherein the motor is connected to the inner wall of the housing through the motor bearing.

[0022] The present application also provides a new energy vehicle, comprising a main body and a driving system according to any one of the above embodiments, wherein the driving system is drivingly connected to the main body. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 is a schematic structural diagram of a driving system according to an embodiment;

[0024] Figure 2 for Figure 1 An enlarged view of A shown in;

[0025] Figure 3 for Figure 1 An enlarged view of B is shown in FIG. DETAILED DESCRIPTION

[0026] In order to facilitate the understanding of the present invention, the present invention will be described more fully below with reference to the relevant drawings. The preferred embodiments of the present invention are given in the drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to understand the disclosure of the present invention more thoroughly and comprehensively.

[0027] It should be noted that when a part is referred to as being "fixed to" another part, it may be directly on the other part or there may be a central part. When a part is considered to be "connected" to another part, it may be directly connected to the other part or there may be a central part at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only and do not represent the only implementation method.

[0028] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0029] Please refer to Figure 1 , the present application provides a drive system 100. The drive system 100 includes: a housing 110, a reducer shaft 120, a motor shaft 130, a first sealing portion 140 and a sealing structure. The reducer shaft 120 is disposed in the housing 110. The motor shaft 130 is disposed in the housing 110. The motor shaft 130 is coaxially connected to the reducer shaft 120. The first sealing portion 140 is located between the reducer shaft 120 and the housing 110. The first sealing portion 140 is sealed and connected to the reducer shaft 120 and the housing 110, respectively.

[0030] Specifically, the motor (not shown) and the reducer (not shown) of the drive system 100 are both located in the housing 110, and the reducer is driven to work by the operation of the motor. The drive system 100 also includes a reducer bearing 160 and a motor bearing 170. The reducer shaft 120 is connected to the inner wall of the housing 110 through the reducer bearing 160. The motor shaft 130 is connected to the inner wall of the housing 110 through the motor bearing 170. The motor shaft 130 is fixedly connected to the reducer shaft 120, and the rotation of the motor shaft 130 drives the reducer shaft 120 to rotate, thereby causing the reducer to operate.

[0031] The first sealing portion 140 may be a lip seal ring. It is understandable that the first sealing portion 140 may also be other types of sealing structures such as an O-ring. The first sealing portion 140 is sleeved on the reducer shaft 120. The first sealing portion 140 is sealed and connected to the reducer shaft 120 and the inner wall of the housing 110 respectively. The first sealing portion 140 is located between the reducer bearing 160 and the motor shaft 130, so as to reduce the oil leaking from the reducer bearing 160 and flowing to the motor shaft 130 through the first sealing portion 140.

[0032] Please combine Figures 1 to 3 , the sealing structure has an oil groove 101. The oil groove 101 is formed between the first sealing portion 140 and the motor shaft 130. The oil groove 101 has a first side wall 101a and a second side wall 101b. The second side wall 101b is located on the side of the first side wall 101a close to the motor shaft 130. The sealing structure also includes a first blocking portion 151, and the first blocking portion 151 is located in the oil groove 101. The first blocking portion 151 is fixedly connected to the side surface of the reducer shaft 120 and protrudes from the side surface of the reducer shaft 120. The distance H1 from one end of the first blocking portion 151 close to the inner wall of the housing 110 to the central axis of the reducer shaft 120 is greater than the distance H2 from the first side wall 101a to the central axis of the reducer shaft 120.

[0033] Specifically, the first blocking portion 151 may be a retaining ring. It is understood that the first blocking portion 151 may be an O-ring or a retaining ring of other structural forms.

[0034] In this embodiment, the sealing structure further includes a second blocking portion 152. The second blocking portion 152 is fixedly connected to the inner wall of the housing 110. The second blocking portion 152, the inner wall of the housing 110 and the first sealing portion 140 form an oil groove 101. The surface of the second blocking portion 152 close to the first sealing portion 140 forms a second side wall 101b. The surface of the first blocking portion 151 close to the second side wall 101b forms a first side wall 101a. The second blocking portion 152 can be a sealing ring, a partition plate or other structures.

[0035] Specifically, after the oil from the inner cavity of the reducer leaks from the first sealing portion 140, it flows from the gap between the first sealing portion 140 and the reducer shaft 120 to the oil groove 101. Since the distance H1 from the end of the first blocking portion 151 close to the inner wall of the housing 110 to the central axis of the reducer shaft 120 is greater than the distance H2 from the first side wall 101a to the central axis of the reducer shaft 120, when the oil flows from the gap between the first sealing portion 140 and the reducer shaft 120 to the oil groove 101, the first blocking portion 151 can prevent the oil from moving along the axial direction of the reducer shaft 120, and the oil will fall into the oil groove 101 under the action of gravity.

[0036] Please refer to Figure 2 , the sealing structure of the area shown in A is located below the reducer shaft 120. For the area shown in A, since the second blocking portion 152 is fixedly connected to the inner wall of the housing 110, and the surface of the second blocking portion 152 close to the first sealing portion 140 forms the second side wall 101b, the second side wall 101b can block the oil falling into the oil groove 101 from flowing toward the motor shaft 130, so that the oil is stored in the oil groove 101, thereby reducing or preventing the oil in the reducer from flowing into the motor, improving the sealing effect of the drive system 100, improving the lubrication effect of the reducer, and improving the working performance of the motor.

[0037] Please refer to Figure 3, the sealing structure of the area shown in B is located above the reducer shaft 120. For the area shown in B, when the oil flows from the gap between the first sealing portion 140 and the reducer shaft 120 to the oil groove 101, the first blocking portion 151 can block the oil from moving along the axial direction of the reducer shaft 120, and the oil will fall under the action of gravity and be stored between the first blocking portion 151 and the first side wall 101a, thereby reducing or preventing the oil in the reducer from flowing into the motor, improving the sealing effect of the drive system 100, improving the lubrication effect of the reducer, and improving the working performance of the motor. As more and more oil leaks from the first sealing portion 140, the liquid level between the first blocking portion 151 and the first side wall 101a continues to rise. When the liquid level rises to be flush with the inner wall of the shell 110 at the first side wall 101a, if the oil continues to leak from the first sealing portion 140, the oil between the first blocking portion 151 and the first side wall 101a will seep back into the inner cavity of the reducer from the gap between the first side wall 101a and the inner wall of the shell 110 at the first side wall 101a, so that the oil in the oil groove 101 will not continue to rise, so that the oil level is always lower than the inner wall of the shell 110 at the first side wall 101a, and the oil leaked from the inner cavity of the reducer is difficult to enter the motor.

[0038] The drive system 100 includes a housing 110, a reducer shaft 120, a motor shaft 130, a first sealing portion 140 and a sealing structure. The oil from the reducer cavity leaks from the first sealing portion 140 and flows into the oil groove 101 from the gap between the first sealing portion 140 and the reducer shaft 120. Since the distance H1 from one end of the first blocking portion 151 close to the inner wall of the shell 110 to the central axis of the reducer shaft 120 is greater than the distance H2 from the first side wall 101a to the central axis of the reducer shaft 120, when the oil flows from the gap between the first sealing portion 140 and the reducer shaft 120 to the oil groove 101, the first blocking portion 151 can block the oil from moving along the axial direction of the reducer shaft 120, and the oil will fall into the oil groove 101 under the action of gravity, and the second side wall 101b can block the oil falling into the oil groove 101 from flowing toward the motor shaft 130, so that the oil is stored in the oil groove 101, thereby reducing or preventing the oil in the reducer from flowing into the motor, thereby improving the sealing effect of the drive system 100, improving the lubrication effect of the reducer, and improving the working performance of the motor.

[0039] In one embodiment, a distance H3 from the second side wall 101 b to the central axis of the reducer shaft 120 is smaller than a distance H2 from the first side wall 101 a to the central axis of the reducer shaft 120 .

[0040] Please refer to Figure 2Specifically, for the area shown in A, as more and more oil leaks from the first sealing portion 140 into the oil groove 101, the liquid level in the oil groove 101 continues to rise. Since the distance H3 from the second side wall 101b to the central axis of the reducer shaft 120 is smaller than the distance H2 from the first side wall 101a to the central axis of the reducer shaft 120, when the liquid level in the oil groove 101 rises to be flush with the end of the first side wall 101a close to the reducer shaft 120, the second side wall 101b can still block the oil, so that the oil cannot flow to the motor shaft 130 through the second side wall 101b. When the liquid level in the oil groove 101 rises to be flush with one end of the first side wall 101a close to the reducer shaft 120, if the oil continues to leak from the first sealing portion 140, the oil in the oil groove 101 will seep back into the inner cavity of the reducer from the gap between the first side wall 101a and the reducer shaft 120, so that the oil in the oil groove 101 will not continue to rise, and the oil level will always be no higher than the surface of the reducer shaft 120 at the first sealing portion 140, thereby making it difficult for the oil leaking from the inner cavity of the reducer to enter the interior of the motor.

[0041] In one embodiment, the distance H3 from the second side wall 101b to the central axis of the reducer shaft 120 is smaller than the radius R1 of the reducer shaft 120 at the first blocking portion 151, so that when the liquid level in the oil tank 101 in the area shown in A rises, the second blocking portion 152 can more reliably block the oil from flowing toward the motor shaft 130, so that the oil level is always no higher than the end of the first side wall 101a close to the reducer shaft 120, thereby making it more difficult for the oil leaking from the inner cavity of the reducer to enter the interior of the motor.

[0042] In one embodiment, the diameter of the reducer shaft 120 gradually decreases from the first sealing portion 140 to the second blocking portion 152, thereby facilitating the arrangement of the second blocking portion 152 and the first blocking portion 151, so that the distance H3 from the second blocking portion 152 to the central axis of the reducer can be smaller than the radius R1 of the reducer shaft 120 at the first blocking portion 151, thereby making the distance H3 from the second side wall 101b to the central axis of the reducer shaft 120 smaller than the radius R1 of the reducer shaft 120 at the first blocking portion 151.

[0043] In one embodiment, the second blocking portion 152 and the housing 110 are integrally formed, so as to facilitate processing and save assembly processes and parts. The second blocking portion 152 and the housing 110 can be sealed and connected to prevent oil leakage.

[0044] It is understandable that the second blocking portion 152 and the shell 110 may also be separate structures, and the second blocking portion 152 and the shell 110 are sealed and connected via a connecting piece.

[0045] The embodiment of the present application also provides a new energy vehicle (not shown). The new energy vehicle comprises a body and a driving system 100 in any of the above embodiments. The driving system 100 is drivingly connected to the body and is used to drive the body to move.

[0046] The new energy vehicle drive system 100 includes a housing 110, a reducer shaft 120, a motor shaft 130, a first sealing portion 140 and a sealing structure. The oil from the reducer cavity leaks from the first sealing portion 140 and flows to the oil tank 101 from the gap between the first sealing portion 140 and the reducer shaft 120. Since the distance H1 from one end of the first blocking portion 151 close to the inner wall of the shell 110 to the central axis of the reducer shaft 120 is greater than the distance H2 from the first side wall 101a to the central axis of the reducer shaft 120, when the oil flows from the gap between the first sealing portion 140 and the reducer shaft 120 to the oil groove 101, the first blocking portion 151 can block the oil from moving along the axial direction of the reducer shaft 120, and the oil will fall into the oil groove 101 under the action of gravity, and the second side wall 101b can block the oil falling into the oil groove 101 from flowing toward the motor shaft 130, so that the oil is stored in the oil groove 101, thereby reducing or preventing the oil in the reducer from flowing into the motor, thereby improving the sealing effect of the drive system 100, improving the lubrication effect of the reducer, and improving the working performance of the motor.

[0047] 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.

[0048] The above-mentioned embodiments only express several implementation methods of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the patent of the present invention. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A drive system, characterized in that: include: case; A reducer shaft is disposed in the housing; A motor shaft is disposed in the housing, and the motor shaft is coaxially connected to the reducer shaft; A first sealing portion, located between the reducer shaft and the housing, the first sealing portion being sealed and connected to the reducer shaft and the housing respectively; as well as A sealing structure, wherein the sealing structure has an oil groove, the oil groove is formed between the first sealing portion and the motor shaft, the oil groove has a first side wall and a second side wall, the second side wall is located on a side of the first side wall close to the motor shaft, the sealing structure includes a first blocking portion located in the oil groove, the first blocking portion is fixedly connected to a side surface of the reducer shaft, the first blocking portion protrudes from the side surface of the reducer shaft, and a distance from one end of the first blocking portion close to the inner wall of the housing to the central axis of the reducer shaft is greater than a distance from the first side wall to the central axis of the reducer shaft; The sealing structure further includes a second blocking portion, which is fixedly connected to the inner wall of the housing, the second blocking portion is located at one end of the motor shaft close to the first sealing portion, the second blocking portion, the inner wall of the housing and the first sealing portion surround the oil groove, the surface of the second blocking portion close to the first sealing portion forms the second side wall, and the surface of the first sealing portion close to the second side wall forms the first side wall; The distance between the second side wall and the central axis of the reducer shaft is smaller than the distance between the first side wall and the central axis of the reducer shaft; The diameter of the reducer shaft gradually decreases from the first sealing portion to the second blocking portion.

2. The drive system according to claim 1, characterized in that: A distance from the second side wall to a central axis of the reducer is smaller than a radius of the reducer shaft at the first blocking portion.

3. The drive system according to claim 1, characterized in that: The second blocking portion is integrally formed with the housing.

4. The drive system according to claim 1, characterized in that: The first blocking portion is a retaining ring.

5. The drive system according to claim 1, characterized in that: The first sealing portion is a lip sealing ring.

6. The drive system according to claim 1, characterized in that: include: a reducer bearing, the reducer being connected to the inner wall of the housing via the reducer bearing; and / or, A motor bearing, wherein the motor is connected to the inner wall of the housing through the motor bearing.

7. A new energy vehicle, characterized in that: It comprises a main body and a driving system as claimed in any one of claims 1 to 6, wherein the driving system is drivingly connected to the main body.

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