JPH04185259A - Electromobile - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an electric vehicle that is non-polluting and can efficiently and freely transport people or cargo.

[Prior Art] Electric vehicles are attracting attention as a solution to the greenhouse effect and air pollution problems caused by carbon dioxide condensation in the atmosphere due to exhaust gas from current internal combustion engines. However, compared to internal combustion engine cars, electric cars
Both horsepower and torque are considerably lower, and due to problems with the efficiency of the drive motor or the electric capacity of the battery, the mileage per charge is never sufficient.Furthermore, the surface temperature of the motor increases with the rotation speed of the motor, causing abnormalities. When the temperature rises, the efficiency of the motor decreases due to damage to the coil of the conductor or demagnetization of the magnet, so cooling the motor has become a major issue.

[Problems to be Solved by the Invention] Even if natural wind is used to cool the driving electric motor, even if it is always air-cooled during running, sufficient air cooling cannot be obtained when the drive motor stops, and natural wind in midsummer In this case, even if forced air cooling is performed, which is not effective as a cooling air, an additional blower is required for that purpose, which further increases the consumption of electricity and reduces the mileage per charge.

The present invention is intended to solve this problem.In an electric vehicle in which a driving electric motor is disposed at the rear of the vehicle body and the rear wheels are driven via a direct drive system or a transmission, the driving electric motor is connected to the cooling cycle of an air peace machine. By installing the air peace machine inside the vehicle and arranging the air peace machine at the rear of the vehicle body, heat loss in the middle of the piping can be reduced, high cooling efficiency can be ensured, and the original performance of the drive electric motor can be maintained. It's about doing.

[Means for Solving the Problems] In order to solve the above-mentioned problems, the electric vehicle of the present invention is an electric vehicle in which a driving electric motor is disposed at the rear of the vehicle body and the rear wheels are driven via a direct drive system or a transmission. In this, the driving electric motor is installed in the cooling cycle of the air peace machine, and the air peace machine is placed in the rear of the vehicle body (trunk, etc.) to reduce heat loss in the middle of the piping and perform highly efficient cooling. Features.

[Example] Air conditioning for electric vehicles has attracted attention in recent years and is considered an important future development issue. High-efficiency motor-integrated compressors have also been developed for air peace machines, and high cooling capacity can now be expected. Therefore, even if the drive motor is cooled within the cooling cycle of the air peace machine, the interior of the vehicle can be sufficiently cooled.

FIG. 1 is a perspective plan view of the configuration of an electric vehicle in an embodiment of the present invention. In addition, in order to clarify the front and back relationship of the electric vehicle of the present invention, FIG.
The location is shown.

The electric vehicle of the present invention is a rear wheel drive type in which the power of the drive electric motor 1 is transmitted only to the rear wheels 10, which requires complicated steering. ! Since the bridge and the drive electric motor 1 can be configured as separate units, and the cooling cycle of the air peace machine for cooling the drive electric motor 1 can also be configured separately from the steering mechanism, the refrigerant piping 2 to the drive electric motor 1 can be configured separately. etc. can be configured extremely easily.

In other words, place the air peace machine at the rear of the vehicle (inside trunk 15, etc.)
By arranging the refrigerant pipe 2 between the drive electric motor 1 and the drive motor 1, the refrigerant pipe 2 can be configured to be extremely short, and heat loss in the middle of the refrigerant pipe 2 is extremely reduced. This eliminates the need to increase the capacity of the air peace machine to deal with cooling capacity problems when air conditioning is carried out, and the design is compact and easy to install. fan 11
・After being air-cooled, the low-temperature and high-pressure liquid refrigerant passes through the refrigerant pipe 2 shown in solid line to the evaporator 4 for in-vehicle air conditioning and the drive: Electric t! Sent to inside A1. The liquid refrigerant that has been throttled by the expansion valve j5 just before the evaporator 4 becomes a low-temperature, low-pressure gas-liquid state and exchanges heat with the surrounding air in the evaporator 4. As a result, the cooled surrounding air is sent to the passenger compartment by the fan 6. blown into 1. On the other hand, most of the refrigerant sent to the drive motor 1 remains in a liquid state, and this liquid refrigerant converts the heat generated by the drive motor 1 into the drive motor [1] by heat exchange with the drive motor 1 itself serving as an evaporator. This provides rapid and more effective cooling with less waste. The refrigerant that has risen in temperature and vaporized by heat exchange is sent to the compressor 7 through the refrigerant pipe 12 indicated by the broken line, and is compressed by the compressor 7 to become a high-temperature, high-pressure refrigerant gas, which is then sent to the condenser 3 again to reduce the temperature. It becomes a high-pressure liquid refrigerant and repeats the above cycle, so thermal damage to the drive motor 1 can be avoided due to the above effects, extending its life and making full use of the inherent performance of the drive motor 8!1. This makes it possible to reduce power consumption and drive comfortably.

Generally, the air peace machine is installed in the hood at the front of the vehicle body, and a duct 8 for sending cool air into the vehicle interior is installed in the front and at the footwell. In addition, since cold air tends to accumulate near your feet,
In contrast to the installation position of the air peace machine according to the present invention, where only the feet are often cold, in the conventional duct arrangement, the duct length is long and heat loss along the duct is large.

Therefore, in the present invention, the air cooled by the evaporator 4 is sent to the side of the ceiling 9 along the window frame of the electric vehicle body, and the duct 8 is arranged so as to blow the cold air down from the top, thereby reducing the length of the duct. It can be completed in a short time, reduces heat loss in the middle of the duct, and evenly cools the entire interior of the vehicle, providing highly efficient air conditioning.

[Effects of the Invention] As explained above, the present invention provides an electric vehicle in which the drive motor is disposed at the rear of the vehicle body and drives the rear wheels via a direct drive or a transmission. In order to keep the piping as short as possible while installing the electric motor within the cooling cycle of the air peace machine, by placing the air peace machine at the rear of the vehicle body, a compact cooling system can be constructed, and losses in the middle of the piping can be reduced. It is possible to achieve very low and highly efficient cooling, and there is no need to increase the capacity of the air peace machine, saving energy.

A fully integrated cooling system is obtained. As described above, since highly efficient cooling is obtained, burnout of the motor windings due to heat generation and reduction in mechanical efficiency due to magnet demagnetization are minimized, allowing comfortable driving.

In addition, by installing air conditioning ducts in the ceiling of the vehicle, the entire interior of the vehicle is cooled evenly, providing efficient and comfortable air conditioning.

[Brief explanation of the drawing]

FIG. 1 is a principal plan view of the configuration of an electric vehicle according to the present invention. 1... Drive electric motor 2... Refrigerant piping 3...
Condenser 4... Evaporator 5... Expansion valve 6...
Fan 7... Compressor 8... Duct 9.
...Ceiling 10.Wheels 11.Condenser cooling fan 12.Headlights and above Applicant Seiko Epson Corporation agent Patent attorney Kizobe Suzuki and 1 other person

Claims (1)

[Claims] In an electric vehicle in which a driving electric motor is arranged at the rear of the vehicle body and the rear wheels are driven via a direct drive system or a transmission, the driving electric motor is installed in the cooling cycle of an air conditioner, and the air peace generator is installed in the vehicle body. An electric vehicle characterized by being mounted at the rear.