JPH10201178A - Drive motor for electric automobile - Google Patents

Abstract

PROBLEM TO BE SOLVED: To cool a heated motor quickly by forming the delivery port of cooling water circulating through the cooling water channel in a housing in the axial direction of the housing while communicating with the cooling water channel. SOLUTION: A cooling water channel 35 is formed around a stator 40 in the housing 30 coaxially with the stator 40 while communicating with the outside on a plane where the housing 30 touches a front cover 60. The front cover 60 is provided with a cooling water flow-an port 61 and a delivery port 62 of cooling water circulated through the cooling water channel 35 in the housing 30 at the upper and lower parts thereof in the axial direction of the housing 30. A sealing member 80 is provided, at the upper and lower parts thereof, with a first flow-in hole 81 and a first delivery hole 82 while communicating with the flow-in port 61 and the delivery port 62 made in the front cover 60. Cooling water from the flow-in port 61 is fed through the first flow-in hole 81 and circulated through the cooling water channel 35 before being delivered through the first delivery hole 82 to the delivery port 62.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a driving motor for an electric vehicle, and more particularly, to a motor for facilitating formation of a cooling water flow path in a housing of a motor and improving the flow of cooling water throughout the housing. The present invention relates to a drive motor for an electric vehicle that can improve the cooling efficiency of a vehicle.

[0002]

BACKGROUND OF THE INVENTION Generally, an automobile is composed of a main body having an external appearance, an engine for driving the automobile, a braking device for stopping the automobile, and a suspension device for reducing vertical vibration of wheels. .

[0003] However, recently, the problems of environmental pollution and natural depletion due to harmful gases generated from gasoline and diesel used as fuel for automobiles have been caused, and research on electric vehicles driven by electricity has been actively conducted. It has now reached the stage of practical use. Such an electric vehicle includes a battery installed therein to store electric energy, and a drive motor for driving the vehicle with electric power supplied from the battery.

On the other hand, when driving a vehicle, high-temperature heat is generated in a drive motor, and the performance of the motor depends on how efficiently this heat is cooled. FIG. 1 is an exploded perspective view showing a conventional driving motor for an electric vehicle. The drive motor includes a hollow housing 10, a stator 11 in which a coil 12 is wound by being pressed into the housing 10, and a rotor 13 received inside the stator 11. Front and rear covers 14a, 14b for sealing the housing 10 are provided on the housing 10.
Are combined respectively.

[0005] In the drive motor configured as described above, when current is supplied to the coil 12 wound around the stator 11 by the battery of the electric vehicle, the rotor 13 rotates, so that the vehicle is driven. At this time, high heat is generated in the motor. In order to cool the heat, a cooling water passage 15 through which cooling water flows and is circulated is formed in the housing 10 and the front and rear covers 14a and 14b. That is, as shown by the arrow in FIG. 1, the cooling water flows through the inlet 16a provided on one side of the upper surface of the front cover 14a, and the housing 10 and the front and rear covers 14a,
After repeatedly passing through the flow path 15 provided in the front cover 14a, a series of operations discharged to the discharge port 16b provided on the other upper surface of the front cover 14a are repeatedly performed, so that the driving motor is cooled. Become.

[0006]

However, since the cooling water flow path of the above-mentioned conventional driving motor is formed only at the four corners of the housing, the cooling water flow path is directly in contact with the stator which actually requires cooling and the coil side. Because they do not cool down,
There is a disadvantage that the cooling performance is reduced.

In addition, since a large number of flow paths, inlets and outlets must be formed in the motor housing and the front and rear covers for the flow of the cooling water, the processing is complicated, and the housing and the front and rear covers are formed. Since the flow path formed in the above should be communicated while maintaining airtightness, a large number of sealing members are required between the housing and the front and rear covers, and there is a problem that the assembling and disassembling processes of the motor are difficult. .

SUMMARY OF THE INVENTION It is an object of the present invention to provide a drive motor for an electric vehicle in which cooling water is configured to flow through the entire interior of a housing and heat generated by the motor can be rapidly cooled.

Another object of the present invention is to provide a drive motor for an electric vehicle, which can facilitate the formation of a cooling water flow path, thereby shortening the manufacturing process.

[0010]

According to the present invention, there is provided a hollow housing, a stator incorporated in the housing and wound with a coil, and an electric current is supplied to the coil through the stator. A rotating rotor, a drive motor for an electric vehicle having a front cover and a rear cover coupled to the housing, wherein the housing has a cylindrical shape concentric with the stator and wrapping the stator. A cooling water flow path is formed, and an inlet for cooling water and a discharge port for discharging cooling water circulated through the cooling water flow path in the housing are formed in the front cover in the axial direction of the housing to form the cooling water. It is characterized in that it is provided so as to communicate with the water flow path.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a drive motor for an electric vehicle according to the present invention will be described in detail with reference to the accompanying drawings. FIG. 2 is an exploded perspective view showing a drive motor for an electric vehicle according to the present invention, and FIG. 3 is an enlarged view of a portion "A" in FIG.
FIG. 4 is a cross-sectional view taken along a plane passing through the center lines of the holes 61 and 62 in a state where the components of FIG. 2 are assembled.

As shown, the drive motor for an electric vehicle according to the present invention has a hollow cylindrical housing 30.
Is prepared. A stator 4 is provided inside the housing 30.
0 is press-fitted, and a coil 41 is wound around the stator 40. Inside the stator 40, a rotor 50, which is a magnetic material, is penetrated and installed. The housing 30 has a front cover 60 for sealing the housing 30 and a rear cover 7.
0 is combined.

The housing 30 and the front and rear covers 60, 70
Are connected by a number of bolts 33a, 33b. To this end, the front and rear covers 60 and 70 have bolts 33 respectively.
Through holes 31a and 32a through which the holes 30a and 33b penetrate are provided, and a large number of coupling holes 31b and 32b are provided on the surface of the housing 30 in contact with the front and rear covers at positions corresponding to the through holes 31a and 32a. I have. Therefore, bolt 3
3a and 33b are formed in the through holes 3 of the front and rear covers 60 and 70, respectively.
1a, 32a through the coupling hole 31b of the housing 30;
32b, the front and rear covers 60, 70
Is firmly connected to the housing 30.

The driving motor having such a structure is connected to a power transmission device connected to wheels of the electric vehicle.
When a current is supplied to the coil 41 wound around the rotor, an electromotive force is generated, and the rotor 50 is rotated by the electromotive force. In this way, the rotor 50 rotates and is connected to the wheel. Since the power transmission device is driven, the vehicle is driven. At this time, high temperature heat is generated in the drive motor. The structure of the drive motor according to the present invention for cooling the heat will be described in detail below.

In the housing 30 of the drive motor, a cylindrical cooling water passage 35 is formed concentrically with the stator 40 and wraps around the stator 40. It comes to communicate with the outside on the side that contacts.

The front cover 60 has an inlet 61 for inflow of cooling water and a discharge port 62 for discharging cooling water circulated through the cooling water flow passage 35 in the housing 30 on one side of the upper and lower parts, respectively. 30 are formed in the axial direction.

At one end of the cooling water flow path 35 on the front cover 60 side, a communication portion 36 formed concentrically with the cooling water flow path 35 is provided so as to communicate with the inflow port 61 and the discharge port 62 of the front cover 60. The communication portion 36 is connected to the cooling water flow path 3.
A cross-sectional area larger than 5 is prepared. Therefore, a difference portion 37 is formed between the cooling water channel 35 and the communication portion 36. A sealing member 80 and a support frame 90 inserted into the communication portion 36 are attached to the difference portion 37. This will be described.

By connecting the housing 30 and the front cover 60, the communicating portion 36 of the cooling water flow passage 35 communicates with the inflow port 61 and the discharge port 62. At this time, the cooling water leaks at the portion where these are connected. In order to prevent this, a hollow disc-shaped sealing member 80 is provided between the housing 30 and the front cover 60, and the sealing member 80 is inserted into the communication portion 36 and attached to the difference portion 37. Also,
A first inflow hole 81 and a first discharge hole 82 are formed on one side of the upper and lower portions of the sealing member 80 so as to communicate with the inflow port 61 and the discharge port 62 provided in the front cover 60, respectively.

That is, the cooling water flowing through the inflow port 61 circulates through the cooling water flow path 35 through the first inflow port 81 and is then discharged to the discharge port 62 through the first discharge port 82.

However, since the sealing member 80 is generally made of a rubber material, cooling water is supplied to the sealing member 80.
When the cooling water flows into the cooling water passage 35 in the housing 30 through the first inflow hole, the sealing member 80 may be sucked into the cooling water passage 35 in the housing 30 due to the flow of the cooling water. In order to prevent this, a rigid support frame 90 is provided between the sealing member 80 and the communication portion 36, and the support frame 90 has the same hollow disk shape as the sealing member 80. A second inflow hole 91 and a second discharge hole 92 are formed in the upper and lower portions of the support frame 90 to communicate with the first and second inflow holes 81 and 82 of the sealing member 80, respectively. Have been.

The operation of the thus configured electric motor drive motor according to the present invention will be described. The driving motor is connected to a power connection device connected to a wheel of the electric vehicle, and generates an electromotive force when current is supplied from a battery provided inside the electric vehicle to a coil 41 wound around the stator 40. Thus, the rotor 50 is rotated by the electromotive force. As described above, the rotor 50 rotates to drive the power transmission device connected to the wheel, so that the vehicle is driven. At this time, high-temperature heat is generated in the drive motor. The cooling water that has flowed through the inlet 61 of the front cover 60 to cool this heat flows into the cooling water flow path 35 in the housing 30 through the first inlet 81 and the second inlet 91, and the inside of the housing 30. , And is discharged to the outside of the motor through the discharge port 62 of the front cover 60 through the second discharge port 92 and the first discharge port 82.

FIG. 5 is an exploded perspective view showing another embodiment of a drive motor for an electric vehicle according to the present invention, FIG. 6 is an enlarged view of a portion "B" in FIG. 5, and FIG. 7 is in accordance with the present invention. It is an exploded perspective view of the drive motor for the electric vehicle viewed from the rear,
FIG. 8 shows the parts 171 and 172 in the assembled state of FIG.
It is sectional drawing at the time of cutting by the plane which passes through the center line of the hole shown by.

As shown in the drawing, a hollow cylindrical housing 130 is provided in the driving motor for an electric vehicle according to the present invention. A stator 140 is press-fitted into the housing 130, and the coil 140 is
One is wound. Inside the stator 140, a rotor 150, which is a magnetic material, is penetrated. A front cover 160 and a rear cover 170 for sealing the housing 130 are coupled to the housing 130.

The housing 130 and the front and rear cover 160,
170 is connected by a number of bolts 133a, 133b. For this purpose, the through holes 131 through which the bolts 133a, 133b pass are respectively formed in the front and rear covers 160, 170.
a, 132a are formed, and the housing 130
Are also provided on the surfaces in contact with the front and rear covers 160, 170 at the positions corresponding to the through holes 131a, 132a.
31b and 132b are prepared. Therefore, bolt 1
When the fasteners 33a and 133b are fastened to the coupling holes 131b and 132b of the housing 130 through the through holes 131a and 132a of the front and rear covers 160 and 170, respectively, the front and rear covers 160 and 170 are firmly coupled to the housing 130. .

The driving motor having such a configuration is connected to a power transmission device connected to wheels of an electric vehicle,
From the battery inside the electric vehicle to the stator 140
When current is supplied to the coil 141 wound around the rotor 150, an electromotive force is generated.
Will rotate. Since the rotor 150 rotates and drives the power transmission device connected to the wheel in this manner, the vehicle is driven. At this time, high temperature heat is generated in the drive motor, and the structure of the drive motor according to the present invention for cooling the heat will be described in detail as follows.

The housing 130 of the drive motor is formed with a cylindrical cooling water passage 135 which is concentric with the stator 140 and surrounds the stator 140. The surface in contact with the cover 160 communicates with the outside.

The rear cover 170 has an inlet 171 for inflow of cooling water, and a cooling water passage 1 in the housing 130.
A discharge port 172 of cooling water circulating through 35 is formed on one side of the upper part and the lower part in the axial direction of the housing 130, respectively. Also, as shown in FIGS.
0 is also in contact with the rear cover 170.
An inflow hole 138 and a discharge hole 139 are provided so that the inflow port 171 and the discharge port 172 are communicated with the cooling water flow path 135 in the housing 130. Sealing members 173 and 174 for maintaining airtightness between the inflow port 171 and the inflow hole 138 and between the discharge port 172 and the discharge hole 139.
Are provided respectively.

That is, the cooling water flowing through the inflow port 171 circulates through the cooling water flow path 135 through the inflow hole 138, and is then discharged to the discharge port 172 through the discharge hole 139.

On the other hand, the front cover 16 of the cooling water passage 135
A communication part 136 formed concentrically with the cooling water flow path 135 is provided at one end on the 0 side, and the communication part 136 has a larger cross-sectional area than the cooling water flow path 135. Therefore,
A difference portion 137 is provided between the cooling water passage 135 and the communication portion 136.
Is formed. The connecting portion 136 is connected to the difference portion 137.
The sealing member 180 and the support frame 190 to be inserted into the frame are mounted, and this will be described.

When the housing 130 and the front cover 160 are connected, cooling water leaks at the connected portion.
In order to prevent this, the housing 130 and the front cover 1
A hollow disc-shaped sealing member 180 is prepared between the gaps 60, and the sealing member 180 is inserted into the communication portion 136 and attached to the difference portion 137.

However, since the sealing member 180 is generally made of a rubber material, there is a possibility that the sealing member 180 will be sucked into the flow passage 135 by the cooling water in the flow passage 135. In order to prevent this, a rigid support frame 190 is provided between the sealing member 180 and the communication portion 136.
The support frame 190 is provided with a sealing member 180.
And the same hollow disk shape.

The operation of the driving motor for an electric vehicle according to the present invention will now be described. The driving motor is connected to a power transmission device connected to a wheel of the electric vehicle, and generates an electromotive force when current is supplied from a battery provided inside the electric vehicle to the coil 141 wound around the stator 140. Thus, the rotor 150 is rotated by the electromotive force. Thus, the rotor 1
The vehicle is driven because 50 rotates to drive the power transmission device connected to the wheel. At this time, high-temperature heat is generated in the drive motor. In order to cool the heat, the drive motor flows into the cooling water flow path 135 through the inflow hole 138 that flows in through the inlet 171 of the rear cover 170, and the inside of the housing 130 is cooled. After circulation, the discharge holes 139
Through the discharge holes 172 of the rear cover 170 to the outside of the motor.

[0033]

As described above, the drive motor for an electric vehicle according to the present invention forms a flow path so that cooling water flows through the entire interior of the housing and rapidly cools the heat generated by the motor. There is an advantage of improving performance. And since the structure of the flow path formed for the flow of the cooling water in the housing of the motor and the front and rear cover is simple, the manufacturing process of the motor is simplified, and it is used for the communication part of the flow path. Since the number of sealing members is reduced, there is a feature that the assembling and disassembling steps of the motor are facilitated.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view showing a conventional driving motor for an electric vehicle.

FIG. 2 is an exploded perspective view showing one embodiment of a drive motor for an electric vehicle according to the present invention.

FIG. 3 is an enlarged view of an “A” part in FIG. 2;

FIG. 4 is a cross-sectional view of the part of FIG. 2 cut along a plane passing through the center lines of holes 61 and 62 in an assembled state.

FIG. 5 is an exploded perspective view showing another embodiment of a drive motor for an electric vehicle according to the present invention.

FIG. 6 is an enlarged view of a “B” part in FIG. 5;

FIG. 7 is an exploded perspective view showing a drive motor for an electric vehicle according to the present invention on a rear surface.

8 shows 171 and 17 in the assembled state of the parts of FIG. 7;
It is sectional drawing at the time of cutting by the plane which passes through the center line of the hole shown by 2.

[Explanation of symbols]

 Reference Signs List 30 cylindrical housing 40 stator 50 rotor 60 front cover 70 rear cover 33a, 33b many bolts 31a, 32a through hole

Claims (13)

[Claims] A hollow housing, a stator built in the housing and wound with a coil, a rotor that rotates when current is supplied to the coil through the stator.
A driving motor for an electric vehicle having a front cover and a rear cover coupled to the housing, wherein a cylindrical cooling water flow path surrounding the stator is formed concentrically with the stator inside the housing; The front cover has an inlet for cooling water, and an outlet for discharging cooling water circulated through the cooling water flow path in the housing is formed in the axial direction of the housing so as to communicate with the cooling water flow path. A drive motor for an electric vehicle, comprising: 2. An end of the cooling water flow path on the side of the front cover having a communication portion formed concentrically with the cooling water so as to communicate with an inlet and an outlet of the front cover. The drive motor for an electric vehicle according to claim 1, wherein 3. The communication section according to claim 2, wherein the communication section has a larger cross-sectional area than the cooling water flow path, and a gap is provided between the cooling water flow path and the communication section. Drive motor for electric vehicles. 4. The drive motor for an electric vehicle according to claim 3, wherein a hollow disk-shaped sealing member for preventing leakage of cooling water is mounted on the difference portion. 5. The electric device according to claim 4, wherein the sealing member is provided with an inlet and an outlet so as to communicate with an inlet and an outlet provided in the front cover. Automotive drive motor. 6. A hollow disk-shaped hard support for preventing the flow of cooling water from sucking the sealing member into the cooling water flow path between the sealing member and the gap. The drive motor for an electric vehicle according to claim 4, wherein a frame is provided. 7. The drive motor for an electric vehicle according to claim 6, wherein the support frame is provided with an inlet hole and an outlet hole through which the inlet hole and the outlet hole of the sealing member communicate. . 8. A hollow housing, a stator housed in the housing and wound with a coil, a rotor that rotates when current is supplied to the coil through the stator.
A driving motor for an electric vehicle having a front cover and a rear cover coupled to the housing, wherein a cylindrical cooling water flow path surrounding the stator is formed concentrically with the stator inside the housing; A cooling water inlet and a discharge port for discharging cooling water circulating through the cooling water flow path in the housing are formed in the rear cover in the axial direction of the housing, and the housing is provided on a surface in contact with the rear cover. A drive motor for an electric vehicle, comprising an inflow hole and a discharge hole for allowing an inflow port and a discharge port of the rear cover to communicate with the cooling water flow path. 9. The drive motor for an electric vehicle according to claim 8, further comprising a sealing member for maintaining airtightness between the inlet and the inlet and between the outlet and the outlet. . 10. The cooling water flow path is provided at one end thereof on the front cover side with a communication part which is communicated with the outside of the housing and formed concentrically with the cooling water flow path. Item 10. A drive motor for an electric vehicle according to item 8. 11. The communication section according to claim 10, wherein the communication section is formed to have a larger cross-sectional area than the cooling water flow path, and a gap is provided between the cooling water flow path and the communication section. Drive motor for electric vehicles. 12. The drive motor for an electric vehicle according to claim 11, wherein a hollow disk-shaped sealing member for preventing leakage of cooling water is mounted on the difference portion. 13. A hollow disk-shaped hard support for preventing the flow of cooling water from sucking the sealing member into the cooling water flow path between the sealing member and the difference portion. The drive motor for an electric vehicle according to claim 12, wherein a frame is provided.