Hub motor liquid cooling ventilation mechanism

Abstract

The utility model discloses a liquid cooling ventilation mechanism for a hub motor. The liquid cooling ventilation mechanism is characterized by comprising an oil-gas separator (1), a ventilation valve (2), a discharge pipe (3) and a return pipe (4), the discharge pipe (3) and the return pipe (4) are arranged on a shaft sleeve (N-1) of the hub motor (N) in a penetrating manner; the outer end of the discharge pipe (3) is connected with an inlet (1-1) of the oil-gas separator (1); the outer end of the return pipe (4) is connected with a liquid outlet (1-2) of the oil-gas separator (1); the ventilation valve (2) is connected with a gas outlet (1-3) of the oil-gas separator (1); the inner end of the discharge pipe (3) and the inner end of the return pipe (4) are both communicated with an inner cavity (N-2) of the hub motor (N). The liquid-cooled hub motor can solve the problems that oil and gas are discharged in a mixed manner when the liquid-cooled hub motor exhausts and releases pressure, so that the discharged cooling liquid pollutes the environment and is continuously reduced, and meanwhile, the cooling liquid in the inner cavity of the hub motor can be prevented from leaking outwards.

Description

Technical Field

[0001] The utility model belongs to the technical field of in-wheel motors, and particularly relates to a liquid-cooling ventilation mechanism for in-wheel motors. Background Art

[0002] The in-wheel motor using liquid cooling injects insulating coolant (or cooling oil) inside, which can cool down the inside of the in-wheel motor, effectively avoiding phenomena such as demagnetization of the magnetic steel or burning of the coil inside the in-wheel motor, and protecting internal electronic components such as circuit boards and sensors at the same time. It not only alleviates the problems of battery power and endurance decline caused by the loss of the in-wheel motor, but also makes the life of the in-wheel motor more durable.

[0003] However, the internal pressure of the existing in-wheel motor using liquid cooling will increase, and exhaust pressure relief is required. Currently, a breather valve is installed on the end cover (such as CN 219918645U). Although exhaust pressure relief can be achieved, the coolant (or cooling oil) and air in the in-wheel motor are mixed and discharged as oil and gas, and the discharged coolant will pollute the environment and the coolant will be continuously reduced. Summary of the Utility Model

[0004] The utility model provides a liquid-cooling ventilation mechanism for in-wheel motors, which can solve the problem that when the in-wheel motor using liquid cooling exhausts pressure, oil and gas are mixed and discharged, resulting in pollution of the environment by the discharged coolant and continuous reduction of the coolant.

[0005] To achieve the above purpose, the solution of the utility model is: a liquid-cooling ventilation mechanism for in-wheel motors, characterized in that: it includes an oil-gas separator, a breather valve, a discharge pipe and a return pipe;

[0006] Both the discharge pipe and the return pipe are arranged on the shaft sleeve of the in-wheel motor;

[0007] The outer end of the discharge pipe is connected to the inlet of the oil-gas separator; the outer end of the return pipe is connected to the liquid outlet of the oil-gas separator; the breather valve is connected to the gas outlet of the oil-gas separator;

[0008] The inner ends of both the discharge pipe and the return pipe are communicated with the inner cavity of the in-wheel motor.

[0009] Further, the outer end of the discharge pipe and the inlet of the oil-gas separator are connected by a first hose; the outer end of the return pipe and the liquid outlet of the oil-gas separator are connected by a second hose.

[0010] Further, a stepped hole with a larger outer diameter and a smaller inner diameter is provided inside the shaft sleeve; the stepped hole has an outer section hole, a stepped surface, and an inner section hole; a discharge pipe mounting hole and a return pipe mounting hole that penetrate inward are provided on the stepped surface; the discharge pipe is mounted on the discharge pipe mounting hole, and the return pipe is mounted on the return pipe mounting hole; a sealing material is filled between the inner wall of the outer section hole and the outer wall of the central shaft of the in-wheel motor.

[0011] Further, the sealing material is made of epoxy resin.

[0012] Further, the discharge pipe and / or the return pipe are made of a rigid material.

[0013] Further, the discharge pipe and / or the return pipe are made of stainless steel.

[0014] Further, the breather valve is a waterproof breather valve. It can prevent external moisture from entering the inner cavity of the in-wheel motor after entering the inside of the oil-gas separator.

[0015] Advantages of the present utility model:

[0016] First, the present utility model can discharge the pressure-relieved air inside the in-wheel motor, and at the same time separate the coolant in the air and then return it to the inner cavity of the in-wheel motor, preventing the discharged coolant from polluting the environment and avoiding the continuous reduction of the coolant, and can ensure long-term effective cooling;

[0017] Second, since the discharge pipe and the return pipe are completely sealed by the sealing material filled between the inner wall of the outer section hole and the outer wall of the central shaft of the in-wheel motor when mounted on the shaft sleeve of the in-wheel motor, the problems of air leakage and liquid leakage can be avoided, and the stability of the performance can be maintained at the same time;

[0018] Third, since the discharge pipe and the return pipe are made of a rigid material, the problems that the discharge pipe and the return pipe are deformed due to the use of a soft material, the sealing effect is not good, and they cannot be replaced can be avoided; by using a rigid material, it can ensure stable sealing after the discharge pipe and the return pipe are fixed by the sealing material on the periphery, and it is also convenient to replace. Description of the Drawings

[0019] Figure 1 is a schematic structural diagram of a liquid-cooled ventilation mechanism of an in-wheel motor in the present utility model.

[0020] Figure 2 is Figure 1 the enlarged view at position K in Detailed Embodiments

[0021] The following further describes the present utility model in conjunction with the drawings and embodiments:

[0022] Embodiment: Refer toFigure 1-2 , a liquid-cooled ventilation mechanism for a hub motor, which includes an oil-gas separator 1, a breather valve 2, a discharge pipe 3 and a return pipe 4.

[0023] It should be noted that the hub motor includes existing structures such as a bushing N-1, a central shaft N-3, an end cover N-5, a hub shell N-4, a stator, a rotor, a bearing N-6, an elastic sealing ring N-7, etc.; and the liquid-cooled ventilation mechanism of this hub motor (i.e., the structure of the present utility model) belongs to a functional mechanism newly added or newly configured on the existing hub motor.

[0024] Specifically, the oil-gas separator 1 is externally arranged on the hub motor and can be installed on the outer end face of the bushing N-1 or other places.

[0025] Among them, both the discharge pipe 3 and the return pipe 4 are arranged through the bushing N-1 of the hub motor N. In this embodiment, a stepped hole N-11 with a large outer diameter and a small inner diameter is provided in the bushing N-1; the stepped hole N-11 has an outer section hole N-111, a stepped surface N-112 and an inner section hole N-113; a discharge pipe mounting hole N-1221 and a return pipe mounting hole N-1222 that penetrate inward are provided on the stepped surface N-112; the discharge pipe 3 is arranged through the discharge pipe mounting hole N-1221, and the return pipe 4 is arranged through the return pipe mounting hole N-1222.

[0026] In addition, a number of wire passing holes may also be provided on the stepped surface N-112, and the wire harness passes through the wire passing holes. A sealing material 5 is filled between the inner wall of the outer section hole N-111 and the outer wall of the central shaft N-3 of the hub motor N. In this way, the discharge pipe 3, the return pipe 4 and the wire harness can be sealed inside the outer section hole N-111 without internal or external leakage. Since the gap formed between the discharge pipe 3, the return pipe 4, the central shaft N-3 and the bushing N-1 is completely sealed, the problem of leakage of the coolant in the inner cavity of the hub motor to the outside can be prevented.

[0027] Specifically, when working, the central shaft N-3 of the hub motor does not rotate, while the hub shell N-4 for assembling the tire rotates. The end cover N-5 of the hub motor is fixedly connected to the hub shell N-4 and rotates together, and the inner hole of the end cover N-5 and the bushing N-1 are rotatably connected through a bearing N-6 and sealed through an elastic sealing ring N-7 to ensure that the end cover N-5 (rotating) is sealed and rotates relative to the bushing N-1 (fixed). Since it belongs to the prior art, it will not be elaborated here.

[0028] Among them, the outer end of the discharge pipe 3 is connected to the inlet 1-1 of the oil-gas separator 1; the outer end of the return pipe 4 is connected to the liquid outlet 1-2 of the oil-gas separator 1; the breather valve 2 is connected to the gas outlet 1-3 of the oil-gas separator 1; the inner ends of the discharge pipe 3 and the return pipe 4 are both communicated with the inner cavity N-2 of the hub motor N.

[0029] The shell of the oil-gas separator 1 is provided with a filter element, which can separate the gas mixed in the coolant. The specific structure of the oil-gas separator 1 can adopt the existing technology or can be directly purchased and assembled.

[0030] The function and working principle of the breather valve are to realize the passage and control of gas through the breathable membrane, while maintaining the air pressure balance of the system and preventing external pollutants from entering. Preferably, the breather valve 2 adopts a waterproof breather valve. Specifically, a threaded waterproof breather valve can be purchased from Zhejiang Mingshu Technology Co., Ltd., model M12*1.5-10. The breathable membrane in the breather valve adopts a polytetrafluoroethylene (E-PTFE) microporous membrane, and the micropore diameter is between 0.1-10 μm. In this way, gas can pass through smoothly, while liquid water cannot pass through, which can prevent water from entering the inside of the oil-gas separator and then entering the inner cavity N-2 of the hub motor.

[0031] Preferably, the outer end of the discharge pipe 3 is connected to the inlet 1-1 of the oil-gas separator 1 through a first hose 6; the outer end of the return pipe 4 is connected to the liquid outlet 1-2 of the oil-gas separator 1 through a second hose 7.

[0032] Preferably, the sealing material 5 adopts epoxy resin.

[0033] Preferably, the discharge pipe 3 or / and the return pipe 4 adopt hard materials.

[0034] In this embodiment, both the discharge pipe 3 and the return pipe 4 are made of stainless steel.

[0035] The working principle of this embodiment is as follows: When the hub motor works, the coolant (or cooling oil) in its inner cavity will increase in temperature and cool down the internally heated rotor, stator, etc.; the air pressure in this inner cavity increases with the increase in temperature, and then the air-coolant mixture gas in it will be discharged from the discharge pipe 3 and enter the inside of the oil-gas separator 1 through the inlet 1-1 of the oil-gas separator 1 for oil-gas separation; the coolant separated by the oil-gas separator 1 will flow back into the inner cavity of the hub motor through the liquid outlet 1-2 of the oil-gas separator 1 through the return pipe 4 for cyclic recovery and continue to cool; the air separated by the oil-gas separator 1 will be discharged through the breather valve 2 through the air outlet 1-3 of the oil-gas separator 1 to achieve the purpose of exhaust pressure relief.

[0036] The present utility model has the following characteristics and the analysis is as follows:

[0037] First, the present utility model can realize the discharge of the pressure-relieving air in the hub motor, and at the same time, the coolant in the air is separated and then flows back into the inner cavity of the hub motor, preventing the discharged coolant from polluting the environment and avoiding the continuous reduction of the coolant, and can ensure long-term effective cooling;

[0038] Second, when the discharge pipe 3 and the reflux pipe 4 are arranged on the shaft sleeve N-1 of the in-wheel motor N, they are completely sealed by the sealing material 5 filled between the inner wall of the outer section hole N-111 and the outer wall of the central shaft N-3 of the in-wheel motor N, which can avoid the problems of air leakage and liquid leakage, and at the same time maintain the stability of performance;

[0039] Third, since the discharge pipe 3 and the reflux pipe 4 of the present invention are made of hard materials, it can avoid the problems of deformation, poor sealing effect and inability to be replaced when the discharge pipe 3 and the reflux pipe 4 are made of soft materials. By using hard materials, it can ensure stable sealing after the discharge pipe and the reflux pipe are fixed by the periphery of the sealing material, and at the same time it is convenient to replace.

[0040] The preferred specific embodiments of the present invention have been described in detail above. It should be understood that those of ordinary skill in the art can make many modifications and variations according to the concept of the present invention without creative labor. Therefore, all technical solutions that can be obtained by those skilled in the art in the technical field based on the concept of the present invention through logical analysis, reasoning or limited experiments on the basis of the prior art should be within the protection scope determined by the claims.

Claims

1. A liquid-cooled ventilation mechanism for a hub motor, characterized in that: It includes an oil-gas separator (1), a breather valve (2), a discharge pipe (3) and a return pipe (4); Both the discharge pipe (3) and the return pipe (4) are arranged on the bushing (N-1) of the in-wheel motor (N); The outer end of the discharge pipe (3) is connected to the inlet (1-1) of the oil-gas separator (1); the outer end of the return pipe (4) is connected to the liquid outlet (1-2) of the oil-gas separator (1); the breather valve (2) is connected to the gas outlet (1-3) of the oil-gas separator (1); The inner ends of both the discharge pipe (3) and the return pipe (4) communicate with the inner cavity (N-2) of the in-wheel motor (N).

2. The liquid-cooling ventilation mechanism of a wheel hub motor according to claim 1, characterized in that: The outer end of the discharge pipe (3) and the inlet (1-1) of the oil-gas separator (1) are connected by a first hose (6); The outer end of the return pipe (4) and the liquid outlet (1-2) of the oil-gas separator (1) are connected by a second hose (7).

3. The liquid-cooled ventilation mechanism for a wheel hub motor according to claim 1 or 2, characterized in that: A stepped hole (N-11) with a large outer diameter and a small inner diameter is arranged in the bushing (N-1); the stepped hole (N-11) has an outer section hole (N-111), a stepped surface (N-112) and an inner section hole (N-113); A discharge pipe mounting hole (N-1121) and a return pipe mounting hole (N-1122) that penetrate in the inward direction are arranged on the stepped surface (N-112); The discharge pipe (3) is arranged on the discharge pipe mounting hole (N-1121), and the return pipe (4) is arranged on the return pipe mounting hole (N-1122); A sealing material (5) is filled between the inner wall of the outer section hole (N-111) and the outer wall of the central shaft (N-3) of the in-wheel motor (N).

4. The liquid-cooling ventilation mechanism of a wheel hub motor according to claim 3, characterized in that: The sealing material (5) is made of epoxy resin.

5. The liquid-cooling ventilation mechanism of a wheel hub motor according to claim 1, characterized in that: The discharge pipe (3) or / and the return pipe (4) are made of a hard material.

6. The liquid cooling and ventilation mechanism for a wheel hub motor according to claim 5, characterized in that: The discharge pipe (3) or / and the return pipe (4) are made of stainless steel.

7. The liquid-cooling ventilation mechanism of a wheel hub motor according to claim 1, characterized in that: The breather valve (2) is a waterproof breather valve.

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