CN105703524A - Motor vehicle in-wheel motor with liquid cooling system and motor vehicle - Google Patents

Abstract

A motor hub motor with a liquid cooling system and a motor vehicle, the hub motor includes a motor housing, a cover plate, an inner rotor motor and a cooling liquid jacket, wherein the inner rotor motor is arranged in an interference fit or nested manner The cooling liquid jacket is radially inside, the cooling liquid jacket is fixedly connected with it inside the motor housing, and the coolant flow is formed between the cooling liquid jacket and the motor housing by means of a circumferential sealing ring space, the cover plate and the motor casing are fixed by bolts, the outer surface of the coolant jacket has an axial rib structure, the inner surface of the motor casing has grooves corresponding to the rib structure, the coolant jacket and the motor The housing is held in place with an interference fit at the ribs and grooves. The fixing of the cooling liquid jacket in the present invention saves the setting of bolts, increases the radial space outside the casing, and facilitates the positioning and sealing of the motor casing and the box cover; and because it is fixed by the rib structure, the cooling liquid casing is completely located inside the casing, which has Conducive to the sealing of the coolant jacket.

Description

Motor vehicle hub motor with liquid cooling system and motor vehicle

technical field

The invention relates to a wheel hub motor, especially a wheel hub motor with a liquid cooling system, and a motor vehicle using the wheel hub motor.

Background technique

In-wheel motor technology, also known as in-wheel motor technology, is a technology that places the motor used to drive the car inside the wheel rim and outside the wheel hub. Its biggest feature is to integrate power, transmission and braking devices into the wheel hub. Therefore, the mechanical part of the electric vehicle is greatly simplified. Generally, a four-wheeled vehicle will install an in-wheel motor in each of the four wheels. Due to the limited space, the heat generated by the motor is often difficult to dissipate by itself, and a special cooling system is required. The liquid cooling system is more commonly used because the heat dissipation efficiency is higher than that of the air cooling system.

The coolant jacket 20 in the existing wheel hub motor is shown in Figure 1, and the fixing method of the coolant jacket 20 and the motor housing 10 using radially arranged fastening bolts is shown in Figure 2. Bolt holes 30 are added to the outer edge, resulting in a large radial space occupied by the coolant jacket 20 as a whole, and the radial fastening bolts 40 occupy the space of the motor housing 10, and the cover plate that also needs to be bolted to the motor housing 10 90 produces crossing (the bolt connection structure between the motor housing 10 and the cover plate 90 is not shown in the figure), which affects the arrangement of the shell closing bolts, causing the cover plate 90 to be difficult to locate when the box is installed and is not conducive to the sealing of the box.

Therefore, it is necessary to provide a hub motor coolant jacket with an improved and simpler fixed structure that still maintains the original effect to solve the above problems.

Contents of the invention

The problem solved by the invention is that the fixing structure of the liquid cooling system of the hub motor is too complicated and occupies too much space.

In order to solve the above problems, the present invention provides a motor vehicle hub motor with a liquid cooling system, including a motor housing, a cover plate, an inner rotor motor and a coolant jacket, wherein the inner rotor motor is interference fit or nested It is arranged radially inside the cooling liquid jacket, and the cooling liquid jacket is fixedly connected with it inside the motor housing, and is formed between the cooling liquid jacket and the motor housing by means of a circumferential sealing ring. Cooling liquid flow space, the cover plate and the motor housing are fixed by bolts, the outer surface of the cooling liquid jacket has an axial rib structure, and the inner surface of the motor housing has a rib structure that is consistent with the rib structure Corresponding to the groove, the cooling liquid jacket and the motor casing are kept fixed by interference fit at the rib structure and the groove.

Optionally, the cooling liquid jacket is axially pressed against the cover plate, and an end face sealing ring is provided between the cooling liquid jacket and the cover plate along the end face of the cooling liquid jacket.

Optionally, the rib structure is arranged on the outer surface of the cooling liquid jacket near the end of the cover plate.

Optionally, the rib structure is also arranged on the far cover plate end of the outer surface of the cooling liquid jacket, the motor housing has a thickened part at the corresponding position of the rib structure at the far cover plate end, and the groove is set On the inner surface of the thickened portion, the radial depth does not exceed the radial thickness of the thickened portion.

Optionally, the rib structure is only arranged on the far cover plate end of the outer surface of the cooling liquid jacket, the motor housing has a thickened part at the corresponding position of the rib structure, and the groove is arranged on the thickened part. The radial depth of the inner surface of the thickened portion does not exceed the radial thickness of the thickened portion.

Optionally, the rib structure is arranged in the cooling liquid flow space, the motor housing has a thickened part at a position corresponding to the rib structure, the groove is arranged on the inner surface of the thickened part, the The radial height of the rib structure is greater than the depth of the groove, and the position and axial length of the rib structure are set according to the cooling fluid drainage requirements.

In the hub motor with a liquid cooling system provided by the present invention, the positions of the rib structure and the groove can be interchanged, that is, the rib structure is arranged on the inner surface of the housing, and the groove is arranged on the outer surface of the coolant jacket , can still achieve the same effect of the above design.

At the same time, the present invention also provides a motor vehicle using the above-mentioned in-wheel motor.

Compared with the prior art, the present invention has the following advantages: the fixing of the coolant jacket in the present invention eliminates the need for bolts, the outer radial space of the housing increases, and it is more convenient for the positioning and sealing of the motor housing and the box cover; and Because the rib structure is fixed, the coolant jacket is completely located inside the casing without protruding from the outer edge, which is conducive to the sealing of the coolant jacket; and the motor coolant jacket is easy to assemble, directly embedded in the groove of the motor casing to form an interference fit.

Description of drawings

Fig. 1 is the radial sectional view of the hub motor coolant jacket in the prior art;

Fig. 2 is an axial sectional view of an in-wheel motor in the prior art;

Fig. 3 is the axial sectional view of hub motor in the present invention;

Fig. 4 is a radial cross-sectional schematic diagram of the coolant jacket of the in-wheel motor shown in Fig. 3;

5 is a perspective view of the hub motor coolant jacket according to the first embodiment of the present invention;

Fig. 6 is a perspective view of an in-wheel motor housing according to the first embodiment of the present invention;

Fig. 7 is a schematic diagram of the in-wheel motor coolant jacket according to the first embodiment of the present invention;

Fig. 8 is a partially enlarged view of the in-wheel motor according to the first embodiment of the present invention;

Fig. 9 is a schematic diagram of the in-wheel motor coolant jacket according to the second embodiment of the present invention;

Fig. 10 is a partially enlarged view of an in-wheel motor according to a second embodiment of the present invention;

Fig. 11 is a schematic diagram of a hub motor coolant jacket according to a third embodiment of the present invention;

Fig. 12 is a schematic diagram of a coolant jacket for an in-wheel motor according to a fourth embodiment of the present invention.

detailed description

As shown in Figure 3, the in-wheel motor of the present invention includes a motor housing 1, a coolant jacket 2, a stator 8 and a rotor, wherein the coolant jacket 2 and the stator 8 are assembled into one body through a shrink-fit process, and are put into the casing together during assembly. 1 and fix it. The interference fit is realized by nesting to fix the motor casing 1 and the coolant jacket 2 together, and finally they are pressed together by the cover plate 9 , and the cover plate 9 and the motor casing 1 are fixed by bolts 4 . Two sealing rings are arranged on the peripheral surface of the coolant jacket, and are pressed by the coolant jacket 2 and the motor housing 1 to seal the coolant, and the other sealing ring is arranged on the end surface of the coolant jacket 2, and the Compress with cover plate 9. As shown in FIG. 4 , in the present invention, the coolant jacket 2 is provided with a rib structure 6 . A groove structure matched with the rib structure 6 is provided on the motor housing 1 .

The first embodiment of the present invention is shown in FIGS. 5 to 8 . Both axial sides of the coolant jacket 21 are smooth and circular, without screw holes for fixing. The outer surface of the coolant jacket 21 near the end of the cover plate is provided with a rib structure 61 , as shown in FIG. 5 . The inner surface of the motor housing 11 is provided with a groove 71 corresponding to the rib structure, as shown in FIG. 6 . As shown in FIG. 7 , the outer surface of the cooling liquid jacket 21 is further provided with two circumferential sealing rings 31 for limiting the flow range of the cooling liquid in the axial direction. As shown in FIG. 8 , the radial height of the rib structure 61 is greater than the radial depth of the groove 71 , and the coolant jacket 31 is interference fit with the housing 11 at the contact position between the rib structure 61 and the groove 71 A circumferential space is formed at the non-contact position, and the circumferential sealing ring 31 is deformed by being squeezed by the coolant jacket 21 and the motor housing 11 in the coolant flow space, thereby forming a coolant flow space. A cover plate 91 is fixed axially to the side of the motor housing 11 by bolts 41, and an end face sealing ring 31' is arranged between the cover plate 91 and the cooling liquid jacket 21 along the end surface of the cooling liquid jacket.

The second embodiment of the present invention is shown in FIGS. 9 and 10 . The difference from the first embodiment is that the rib structure 62 is arranged on the outer surface of the coolant jacket 22 at the end far from the cover plate, as shown in FIG. 9 . And, as shown in FIG. 10 , the motor housing 12 is provided with an annular thickened portion 82 corresponding to the rib structure 62, the axial length of the thickened portion 82 can be equivalent to the length of the rib structure 62, and the concave The groove 72 is disposed on the inner surface of the thickened portion 82 , and the depth does not exceed the radial thickness of the thickened portion 82 .

The third embodiment of the present invention is shown in FIG. 11 , the coolant jacket 23 has both the side rib structure 63 near the cover plate of the first embodiment and the side rib structure 63 ′ of the far cover plate of the second embodiment, so The motor housing also has grooves corresponding to the rib structure as in the first and second embodiments.

The fourth embodiment of the present invention is shown in FIG. 12. The difference from the second embodiment is that the rib structure 64 is arranged between the first sealing ring and the second sealing ring. Since the rib structure 64 is located in the cooling liquid In the flow space, in addition to the fixing function, it can also play the role of draining the coolant, so the length and position of the rib structure 64 can be adjusted according to different draining purposes.

While this invention has been described in terms of only certain exemplary embodiments, such description should be considered by way of illustration only, and not limitation. Various changes are possible within the scope described in the appended claims without departing from the spirit and scope of the invention.

Claims (8)

1. a Vehicular hub motor with liquid cooling system, including electric machine casing (1), cover plate (9), inner rotor motor and coolant jacket (2), wherein said inner rotor motor interference fit or be nestedly arranged on described coolant jacket (2) inner radial, described coolant jacket (2) connects internal being secured to of described electric machine casing (1), and between described coolant jacket (2) and described electric machine casing (1), constitute coolant flow space by circumferential seal circle (31), described cover plate (9) and described electric machine casing (1) are bolted, it is characterized in that, the outer surface of described coolant jacket (23) has axial muscle structure (6), the inner surface of described electric machine casing (1) has the groove corresponding with described muscle structure (6), described coolant jacket (2) and described electric machine casing (1) adopt the interference fit in muscle structure (6) and groove to keep fixing。

2. there is the Vehicular hub motor of liquid cooling system as claimed in claim 1, it is characterized in that: described coolant jacket (2) is axially compressed by described cover plate (9), and end face along coolant jacket has end-face seal ring (31 ') between described coolant jacket (2) and described cover plate (9)。

3. there is the Vehicular hub motor of liquid cooling system as claimed in claim 2, it is characterised in that: described muscle structure (6) is arranged on the nearly cover plate end of described coolant jacket (2) outer surface。

4. there is the Vehicular hub motor of liquid cooling system as claimed in claim 2, it is characterized in that: described muscle structure (6) is arranged on the remote cover plate end of described coolant jacket outer surface, described electric machine casing has thickened section at the correspondence position of described muscle structure, described groove is arranged on thickened section inner surface, and its radial depth is less than the radial thickness of described thickened section。

5. there is the Vehicular hub motor of liquid cooling system as claimed in claim 3, it is characterized in that: described muscle structure (6) is additionally arranged at the remote cover plate end of described coolant jacket outer surface, described electric machine casing has thickened section at the correspondence position of described remote cover plate end muscle structure, described groove is arranged on thickened section inner surface, and its radial depth is less than the radial thickness of described thickened section。

6. there is the Vehicular hub motor of liquid cooling system as claimed in claim 2, it is characterized in that: described muscle structure is arranged in described coolant flow space, described electric machine casing has thickened section at the correspondence position of described muscle structure, described groove is arranged on thickened section inner surface, the radial height of described muscle structure needs according to coolant drain more than described depth of groove, the position of described muscle structure and axial length and arranges。

7. the arbitrary Vehicular hub motor with liquid cooling system as described in claim 1 to 6, it is characterized in that: described muscle structure (6) is arranged on described housing (1) inner surface, and described groove is arranged on described coolant jacket (2) outer surface。

8. motor vehicles, it is characterised in that apply the Vehicular hub motor with liquid cooling system described in any of the above-described claim。