Hub motor with built-in circulating water sump

Abstract

The invention discloses a hub motor with a built-in circulating water sump, which comprises a main shaft, and further comprises a stator bracket, a circulating water sump, a stator, a left bearing, a left hub cover, a hub, a left oil seal, a right hub cover, a right bearing and a right oil seal which are coaxially arranged with the main shaft, two through holes are formed in the thick end of the main shaft along the axis of the main shaft; a mounting seat matched with the circulating water sump is arranged on one side of the stator bracket; the stator support is in key connection with the middle end of the main shaft, the stator is fixedly sleeved on the stator support, the circulating water sump is arranged in a mounting seat at one end of the stator support, and two water pipes of the circulating water sump penetrate through a through hole in the main shaft and then extend out of the main shaft; the spindle at one end of the stator is connected with a left hub cap through a left bearing, the other end of the stator is connected with a right hub cap through a right bearing, and the hub is arranged on the left hub cap and the right hub cap. According to the hub motor, the heat dissipation effect can be obviously improved on the premise that the rigidity of the main shaft meets the requirement, and the mass production cost can be reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to a wheel hub motor, in particular to a water-cooled wheel hub motor. BACKGROUND

[0002] The wheel hub motor highly integrates power device, transmission device and brake device, realizes the effect of structure simplification, cost reduction and control difficulty reduction, so that it is widely used. In the prior art, the inner stator and outer rotor type wheel hub motor has become the standard configuration of two-wheeled electric vehicles. However, during the working process of the wheel hub motor, the winding and the core will heat up due to eddy current loss, which causes adverse consequences such as power performance decline, component aging acceleration, permanent magnet demagnetization, etc. Therefore, the high-efficiency heat dissipation technology of the wheel hub motor has been a research topic in the industry. In the prior art, the wheel hub motor mainly adopts air cooling heat dissipation, and since the wheel hub is a closed body, the heat dissipation effect is not ideal. Some manufacturers have proposed a water-cooled structure of the wheel hub motor, which sets the main shaft as left and right half shafts, and sets a water cooling chamber between the left and right half shafts. However, this structure damages the rigidity of the main shaft, and has potential drawbacks such as decline of motor working stability and reduction of expected service life. At the same time, compared with the traditional motor, the production process of this structure changes greatly, and the existing production line needs to be greatly modified for mass production, which is not conducive to cost reduction and efficiency improvement of enterprises. SUMMARY

[0003] The technical problem to be solved by the present application is to provide a wheel hub motor with a built-in circulating water chamber, which can significantly improve the heat dissipation effect under the premise that the rigidity of the main shaft meets the requirements, and is conducive to reducing the production cost.

[0004] To solve the above technical problems, the technical solution adopted by the present application is:

[0005] A wheel hub motor with a built-in circulating water chamber, comprising a main shaft, and further comprising a stator support, a circulating water chamber, a stator, a left bearing, a left hub cover, a wheel hub, a left oil seal, a right hub cover, a right bearing and a right oil seal, which are coaxially arranged with the main shaft; the circulating water chamber is provided with an assembly hole matched with the main shaft in the center, and two water pipes perpendicular to the end face of the circulating water chamber are further arranged on the circulating water chamber; two through holes matched with the two water pipes are arranged on the thick end of the main shaft along the axis of the main shaft; an installation seat matched with the circulating water chamber is arranged on one side of the stator support; the stator support is keyed to the middle end of the main shaft, the stator is fixedly sleeved on the stator support, the circulating water chamber is arranged in the installation seat at one end of the stator support, and the two water pipes of the circulating water chamber extend to outside the main shaft after penetrating through the through holes on the main shaft; the main shaft at one end of the stator is connected with the left hub cover through the left bearing, and the main shaft at the other end is connected with the right hub cover through the right bearing; the wheel hub is arranged on the left hub cover and the right hub cover; the left oil seal is arranged between the left hub cover and the main shaft, and the right oil seal is arranged between the right hub cover and the main shaft.

[0006] The mounting base on the stator support is configured as an annular base, the side height of which matches the thickness of the circulating water tank, and the circulating water tank is nested and installed inside the annular base.

[0007] The main shaft is configured as a variable diameter shaft, and the annular base on the stator support is located on the narrow end side of the main shaft.

[0008] The technical advantages of this invention are as follows: A. The motor adopts a water-cooling mode, and the circulating water tank, which serves as a heat dissipation device, is built into the core of the hub motor, significantly improving heat dissipation efficiency compared to the traditional surface air-cooling mode; B. This hub motor only has two through holes at the thick end of the main shaft, resulting in a small change in the main shaft stiffness and not affecting the reliability of the motor; C. Existing production lines of enterprises can produce the hub motor of this invention with simple modifications, which is beneficial for cost reduction and efficiency improvement; D. The coolant or circulating fluid operates in a closed channel and has no direct contact with conductive components, reducing the risk of short circuits, corrosion, and other hazards from the source. Attached Figure Description

[0009] Figure 1 This is an exploded view of the present invention;

[0010] Figure 2 This is a cross-sectional view of the present invention in its assembled state;

[0011] Figure 3 yes Figure 2 A sectional view along line A-A. Detailed Implementation

[0012] The specific embodiments of the present invention will be further described below with reference to the accompanying drawings.

[0013] Example 1

[0014] like Figure 1 , Figure 2 , Figure 3 As can be seen, the hub motor with built-in circulating water tank in this embodiment includes a main shaft 1, and also includes a stator support 2, a circulating water tank 3, a stator 4, a left bearing 5, a left hub cover 6, a hub 7, a left oil seal 8, a right hub cover 9, a right bearing 10, and a right oil seal 11, all coaxially arranged with the main shaft 1. The circulating water tank 3 has a mounting hole at its center that matches the main shaft 1, and two water pipes 30 perpendicular to its end face are also provided on the circulating water tank 3. The thick end of the main shaft 1 has two through holes along its axis that match the two water pipes 30. A mounting seat matching the circulating water tank 3 is provided on one side of the stator support 2. The stator support 2 is keyed to the middle end of the main shaft 1, and the stator 4 is fitted and fixed on the stator support 2. The circulating water tank 3 is located in the mounting seat at one end of the stator support 2, and its two water pipes 30 extend beyond the main shaft 1 after passing through the through holes on the main shaft 1.

[0015] The stator 4 has a main shaft 1 at one end connected to a left hub cover 6 via a left bearing 5, and a right hub cover 9 at the other end connected to a right bearing 10. The hub 7 is located on the left hub cover 6 and the right hub cover 9. The left oil seal 8 is located between the left hub cover 6 and the main shaft 1, and the right oil seal 11 is located between the right hub cover 9 and the main shaft 1.

[0016] Working principle: The main shaft 1 is fixed on the frame. When powered, the wheel hub 7, left hub cover 6, and right hub cover 9 are integrated and rotate relative to the stator 4 to do work under the support of the left bearing 5 and the right bearing 10. The water tank located outside the wheel hub motor circulates water with the circulating water chamber 3 through two water pipes 30, and the heat inside the wheel hub motor is discharged through the circulating water.

[0017] like Figure 2 , Figure 3 Furthermore, the mounting base on the stator support 2 is configured as an annular base, the side height of which matches the thickness of the circulating water tank 3. The circulating water tank 3 is nested within the annular base, and the stator support 2 is mounted on the main shaft 1. Two water pipes 30 pass through the through holes on the main shaft 1. The circulating water tank 3 and the two water pipes 30 simultaneously form surface contact with the stator support 2 and the main shaft 1. This structure improves the overall rigidity and facilitates heat conduction.

[0018] Example 2

[0019] like Figure 2 , Figure 3 As can be seen, in this preferred embodiment, the main shaft 1 is a variable-diameter shaft with a thinner left end and a thicker right end. The annular base on the stator support 2 is positioned on the thinner end side of the main shaft 1, with the centerline of the hub motor as the boundary. Since the circulating water tank 3 is nested within the annular base, the circulating water tank 3 and the thinner end of the main shaft are located on the same side of the hub motor's centerline, while the thicker end of the main shaft and the main body of the stator support 2 are located on the opposite side. The load on the left side includes the thinner end of the main shaft and the circulating water tank 3, while the load on the right side includes the thicker end of the shaft and the main body of the stator support 2. Therefore, the circulating water tank 3, positioned on the thinner end side, simultaneously serves as a counterweight, which is beneficial for stable motor operation. Another advantage of this structure is that the hub motor's control system can further adjust the counterweight balance by regulating the volume of the circulating water tank 3 using an external pump.

[0020] It should be understood that the above embodiments use positional terms such as left and right for ease of description, but do not constitute an improper limitation on the scope of protection of the present invention.

[0021] The specific embodiments of the present invention include, but are not limited to, the above-described embodiments. Without departing from the spirit and essence of the present invention, those skilled in the art can make various corresponding changes and modifications according to the present invention, but these still fall within the protection scope of the present invention.

Claims

1. A built-in circulating water tank hub motor, comprising a main shaft (1), further comprising a stator support (2) coaxially arranged with the main shaft (1), a circulating water tank (3), a stator (4), a left bearing (5), a left hub cover (6), a hub (7), a left oil seal (8), a right hub cover (9), a right bearing (10), a right oil seal (11); characterized in that: The circulating water tank (3) is provided with an assembly hole matched with the main shaft (1) in the center, and is further provided with two water pipes (30) perpendicular to the end face; the main shaft (1) is provided with two through holes matched with the two water pipes (30) along the axis on the thick end; one side of the stator support (2) is provided with a mounting seat matched with the circulating water tank (3); the stator support (2) is key-connected in the middle end of the main shaft (1), the stator (4) is fixedly sleeved on the stator support (2), the circulating water tank (3) is arranged in the mounting seat at one end of the stator support (2), and the two water pipes (30) of the circulating water tank (3) extend to the outside of the main shaft (1) after penetrating through the through holes on the main shaft (1); the main shaft (1) at one end of the stator (4) is connected with the left hub cover (6) through the left bearing (5) and connected with the right hub cover (9) through the right bearing (10), and the wheel hub (7) is arranged on the left hub cover (6) and the right hub cover (9); the left oil seal (8) is arranged between the left hub cover (6) and the main shaft (1), and the right oil seal (11) is arranged between the right hub cover (9) and the main shaft (1).

2. The in-wheel motor with a built-in circulating sump according to claim 1, characterized by: The mounting seat on the stator support (2) is arranged as an annular base, the height of the side edge of the annular base is matched with the thickness of the circulating water tank (3), and the circulating water tank (3) is nested and arranged in the annular base.

3. The in-wheel motor with a built-in circulating sump according to claim 2, characterized by: The main shaft (1) is arranged as a variable-diameter shaft, and the annular base on the stator support (2) is arranged on the thin end side of the main shaft (1).

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