JP2014054873A - Cooling structure of traveling electrical component for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cooling structure of a traveling electrical component for a vehicle, effectively using the traveling air to perform cooling even in the case of layout in which a traveling electrical component is disposed at the side of a vehicle, so that the operational frequency of a motor-driven fan is lowered to reduce bad effects concerning fuel consumption and noise in the periphery.SOLUTION: A ram-air box 20 is disposed at the side of a vehicle, and the traveling air is introduced into an introduction port 20c of the ram air box 20 by an air guide part 21 formed on a side skirt 15 in the front thereof. The dynamic pressure of the introduced traveling air is converted to static pressure in a diffuser 20b, and guided into a surge tank part 20a, and the traveling air is passed through a radiator 19 by front-back differential pressure to heat-exchange with cooling water. The cooling water the temperature of which drops is circulated through a traveling motor and an inverter to perform cooling. When an inverter temperature T rises, after an opening and closing valve 24 is opened, a motor-driven fan 23 is operated to cool the radiator 19.

Description

  The present invention relates to a cooling structure for electric equipment for traveling of a vehicle, and more particularly, to a structure for guiding wind to a cooling radiator attached to the electric equipment for traveling.

In electric vehicles and hybrid vehicles, a motor is mounted as a power source for traveling, and various devices such as a battery for supplying power to the traveling motor and an inverter for driving the motor (hereinafter referred to as these traveling motor, battery, inverter, etc.). It is generally referred to as electrical equipment for traveling. Since these traveling electrical devices generate heat during operation, various cooling measures are taken for the purpose of maintaining the expected performance and preventing damage.
For example, in a passenger car or the like, since electrical equipment for traveling can be mounted in the engine room in the front part of the vehicle body, it is relatively easy to introduce the traveling wind into the engine room for cooling. However, for example, in a truck, there is little room in the engine room below the cabin, and in a bus, the engine room is provided at the rear of the vehicle body with priority on the passenger compartment. It becomes difficult.

Therefore, in this type of vehicle, the traveling electrical equipment is mounted on the vehicle body side, that is, on either the left or right side of the vehicle body frame, and it is inevitably impossible to introduce the traveling wind as in the case of the vehicle body front. Therefore, some measures are required for cooling.
For example, in the hybrid vehicle disclosed in Patent Document 1, electrical equipment for traveling such as a battery, an inverter, and a radiator for cooling the inverter is housed in a two-stage casing installed on the side of the vehicle body, and an electric fan is used. It is cooling.

  Specifically, a suction port is formed in the lower part of the housing, an opening is formed in a partition plate that divides the interior of the housing up and down, and a suction-type electric fan is provided in the upper part of the housing. By operating the electric fan, high temperature air in the upper stage in the casing is discharged to the outside, and along with that, outside air is introduced from the suction port to the lower stage and guided to the upper stage through the opening. Cooling the battery directly with the low-temperature outside air, passing the outside air through the radiator and exchanging heat with the inside cooling water, circulating the cooling water whose temperature has decreased inside the inverter to obtain a cooling action Yes.

JP-A-2005-133872

The operation of the electric fan requires electric power, which causes a deterioration in fuel consumption, and the operation noise becomes noise to the surroundings. Therefore, it is desirable to shorten the operation time of the electric fan as much as possible.
However, the hybrid vehicle disclosed in Patent Document 1 relies on an electric fan to introduce outside air without taking measures to actively introduce running wind. Therefore, it is necessary to frequently operate the electric fan in order to suppress overheating of the electrical equipment for traveling, and there may be a situation in which overheating cannot be suppressed unless the electric fan is continuously operated, particularly in a high temperature environment such as summer. Therefore, there is still room for improvement in terms of fuel consumption caused by operation of the electric fan and noise to the surroundings.
The present invention has been made to solve such problems, and the object of the present invention is to effectively use traveling wind for cooling even in a layout in which traveling electrical equipment is arranged on the side of the vehicle. Accordingly, it is an object of the present invention to provide a cooling structure for electrical equipment for traveling of a vehicle that can reduce the frequency of operation of an electric fan and reduce adverse effects related to fuel efficiency and noise to the surroundings.

  In order to achieve the above object, the invention of claim 1 includes a diffuser portion disposed on a side portion of a vehicle and configured to gradually increase a passage cross-sectional area from an inlet, and a surge tank portion connected to the diffuser portion. A ram air box that is configured to introduce the traveling wind accompanying the traveling of the vehicle from the introduction port and convert the dynamic pressure of the traveling wind in the diffuser section into static pressure and guide it into the surge tank section, and the surge tank section side of the ram air box The opening / closing means that can be opened and closed and the surge tank portion of the ram air box that allows the traveling wind in the surge tank portion to pass therethrough to exchange heat with the internal cooling water. In addition, a radiator that circulates cooling water whose temperature has decreased due to heat exchange to a traveling electrical device mounted on the vehicle, an electric fan attached to the radiator, and a traveling Control device that stops the electric fan and closes the opening and closing means when the temperature of the equipment is low, and operates the electric fan and opens the opening and closing means when the temperature of the electrical equipment for traveling is high It is.

According to a second aspect of the present invention, in the first aspect, the first side skirt is disposed at the front side position of the ram air box at the side of the vehicle, and the traveling wind is guided to the first side skirt to the inlet of the ram air box. The wind guide part to be formed is formed.
According to a third aspect of the present invention, in the first or second aspect, the front position on the discharge side of the radiator can be switched between two positions, a restriction position facing the flow of the traveling wind and a retracted position following the flow of the traveling wind. The control means switches the flap to the restriction position when the temperature of the traveling electrical equipment is low, and switches the flap to the retracted position when the temperature of the traveling electrical equipment is high.

According to a fourth aspect of the present invention, in the first to third aspects, even when the temperature of the electrical equipment for traveling is low, the control means retracts the flap when the vehicle speed is equal to or higher than a preset vehicle speed judgment value. Switch to position.
According to the fifth aspect of the present invention, in addition to the first to fourth aspects, the opening / closing means is disposed at the downstream end in the surge tank portion, and the ram air box at the side portion of the vehicle is provided. A second side skirt was disposed so as to be continuous with the rear position.

  As described above, according to the cooling structure for a vehicle electrical equipment for a vehicle according to the first aspect of the present invention, the ram air box including the diffuser portion and the surge tank portion is disposed on the side portion of the vehicle, and the opening on the surge tank portion side Can be opened and closed by the opening / closing means, and a radiator having an electric fan is disposed in the surge tank portion so that the cooling water is circulated between the traveling electric equipment and the control means. When the temperature of the equipment is low, the electric fan is stopped and the opening / closing means is closed. On the other hand, when the temperature of the traveling electrical equipment is high, the electric fan is operated and the opening / closing means is opened.

  Accordingly, during traveling of the vehicle, the traveling wind is introduced into the diffuser portion of the ram air box from the introduction port, and is converted into a static pressure in the diffuser portion and then guided into the surge tank portion. And since the opening / closing means is closed when the temperature of the electrical equipment for traveling is low, the static pressure of the traveling wind acts in the surge tank portion. At this time, the electric fan is not operating, but the traveling wind passes through the radiator and exchanges heat with the cooling water due to the differential pressure generated by the static pressure, so that the traveling electrical equipment is cooled by the cooling water whose temperature has decreased. The

  On the other hand, when the traveling wind decreases, the radiator is insufficiently cooled and the temperature of the electrical equipment for traveling rises. At this time, the electric fan operates and the opening / closing means is opened. External air is smoothly introduced into the surge tank from the inlet of the diffuser and the opening on the surge tank side, passes through the radiator, and exchanges heat with the cooling water. As a result, it is not necessary to operate the electric fan when the temperature of the electrical equipment for traveling is low. Therefore, the frequency of operation of the electric fan can be reduced to reduce adverse effects related to fuel efficiency and noise to the surroundings.

According to the cooling structure for electric equipment for traveling of a vehicle according to a second aspect of the invention, in addition to the first aspect, the first side skirt is disposed on the front side of the ram air box on the side of the vehicle, A wind guide portion for guiding the running wind was formed at the inlet.
Therefore, the traveling wind flowing along the vehicle side can be reliably guided to the inlet of the ram air box by the wind guide portion of the first side skirt.

According to the cooling structure for a vehicle electrical equipment for a vehicle according to a third aspect of the invention, in addition to the first or second aspect, a flap that can be switched between a restriction position and a retracted position is provided on the discharge side of the radiator. The control means switches the flap to the restriction position when the temperature of the traveling electrical equipment is low, while switching the flap to the retracted position when the temperature of the traveling electrical equipment is high.
When the temperature of the electrical equipment for traveling is low, a negative pressure is generated on the discharge side of the radiator due to the flap at the restriction position, and the front-rear differential pressure is increased. Therefore, the cooling efficiency of the radiator can be improved. In addition, since the electric fan operates when the temperature of the electrical equipment for traveling is high, the radiator is sufficiently cooled without generating negative pressure, and the air resistance of the flap is reduced by switching to the retracted position, thereby deteriorating fuel consumption. It can be avoided in advance.

According to the cooling structure of the electrical equipment for traveling of the vehicle of the invention of claim 4, in addition to the first to third aspects, the vehicle speed is equal to or higher than the vehicle speed judgment value even when the temperature of the electrical equipment for traveling is low. In some cases, the flap is switched to the retracted position by the control means.
Accordingly, the air resistance of the flap increases as the vehicle speed increases, but such a situation can be avoided by switching to the retracted position, thereby preventing deterioration in fuel consumption due to the increase in air resistance.

According to a fifth aspect of the present invention, in the first to fourth aspects, the opening / closing means is disposed at the downstream end in the surge tank portion so as to be continuous rearward from the ram air box at a rear position of the ram air box on the side of the vehicle. A second side skirt is provided.
Accordingly, since the opening / closing means is concealed from the side of the vehicle by the ram air box and the second side skirt, troubles of the opening / closing means can be prevented beforehand.

It is a side view which shows the hybrid truck to which the cooling structure of the electrical equipment for driving | running | working of 1st and 2nd embodiment was applied. It is a top view which shows a hybrid type truck. It is an enlarged plan view of FIG. 2 which shows the ram air box at the time of the stop of the electric fan in 1st Embodiment. It is an enlarged plan view which shows the ram air box at the time of the action | operation of an electric fan. It is a perspective view which shows the ram air box seen from the A direction of FIG. It is an enlarged plan view which shows the ram air box at the time of the stop of the electric fan in 2nd Embodiment. It is an enlarged plan view which shows the ram air box at the time of the action | operation of an electric fan. It is a perspective view which shows the ram air box seen from the A direction of FIG. FIG. 3 is a partial plan view of FIG. 2 showing another example of the arrangement of the ram air box.

[First Embodiment]
Hereinafter, a first embodiment in which the present invention is embodied in a cooling structure for a traveling electrical device in a rear-wheel two-shaft hybrid truck will be described.
FIG. 1 is a side view showing a hybrid truck to which a cooling structure for electrical equipment for traveling according to this embodiment is applied, and FIG. 2 is a plan view showing the hybrid truck.
The body frame 1 of the truck is configured as a so-called ladder frame, and a cabin 3 is provided on the upper side of the left and right front wheels 2 of the body frame 1, and a loading platform is installed on the rear side of the cabin 3 (not shown). An engine room 4 is provided below the cabin 3, and an engine 5 and a travel motor 6 are mounted in the engine room 4 as a power source for travel.

Although a detailed description of the mechanism is omitted, the driving force of the engine 5 and the traveling motor 6 is arbitrarily input to the transmission 7 and is shifted according to the shift speed, and then the front shaft and the rear shaft via the propeller shaft 8. To the final drive devices 9 and 10. The driving force is distributed from the final drive devices 9 and 10 to the left and right rear wheels 11 and 12, respectively, whereby the rear wheels 11 and 12 are rotationally driven so that the vehicle travels.
Side skirts 14 and 15 are disposed between the left and right front wheels 2 and the rear wheel 11 of the front shaft, respectively. As is well known, the side skirts 14 and 15 are equipment for preventing the traveling wind from entering the lower side of the vehicle during traveling of the vehicle and suppressing deterioration in fuel consumption due to an increase in air resistance.

The right side skirt 14 has a general flat plate shape, but the left side skirt 15 is manufactured in a shape suitable for cooling the radiator of the electrical equipment for traveling disposed on the left side of the body frame 1. ing. Hereinafter, the configuration of the electrical equipment for traveling together with the shape of the side skirt 15 will be described.
A battery 17 and an inverter 18 are installed on the left side of the body frame 1 at the front side position of the rear wheel 11. Since the role of these devices is well known, detailed description is omitted. For example, when the vehicle is traveling, the DC power of the battery 17 is converted into AC power by the inverter 18 and supplied to the traveling motor 6 to generate driving force. Let Further, when the vehicle is decelerated, the traveling motor 6 is caused to function as a generator, and the generated AC power is converted into DC power by the inverter 18 to charge the battery 17.

In the present embodiment, the traveling motor 6, the battery 17 and the inverter 18 described above correspond to electrical equipment for traveling. As the cooling method, the battery 17 is air-cooled, whereas the traveling motor 6 and the inverter 18 are A water-cooling type using a radiator 19 is employed.
However, the present invention is not limited to this, and can be arbitrarily changed. For example, another traveling motor may be added as the traveling electrical equipment. Further, for example, the traveling motor 6 may be air-cooled or the battery 17 may be water-cooled.

  In the water-cooling type cooling, the outside air is passed through the radiator 19 to exchange heat with the internal cooling water, and the cooling water whose temperature has decreased is circulated to the traveling motor 6 and the inverter 18 to obtain a cooling action. However, as described in [Problems to be Solved by the Invention], when the radiator 19 is disposed on the side of the vehicle body, it is almost impossible to introduce the traveling wind, and the introduction of outside air is electrically driven as in the technique of Patent Document 1. Depending on the fan, bad effects such as deterioration of fuel consumption due to power consumption and noise to the surroundings due to fan operation occur.

  Therefore, in the present embodiment, measures are taken to positively introduce the traveling wind using the ram air box 20, thereby reducing the operating frequency of the electric fan and eliminating the above problems. 3 is an enlarged plan view of FIG. 2 showing the ram air box 20 when the electric fan is stopped, FIG. 4 is an enlarged plan view showing the ram air box 20 when the electric fan is operated, and FIG. 5 is viewed from the direction A of FIG. It is a perspective view which shows the ram air box 20, and the electric fan is abbreviate | omitted in FIG.

The ram air box 20 is disposed at a front side position of the inverter 18 and includes a surge tank portion 20a and a diffuser portion 20b. The surge tank portion 20a has a cylindrical shape with a rectangular cross section extending in the front-rear direction, and the rear end of the diffuser portion 20b is connected to the front end thereof. The diffuser portion 20b gradually reduces the vertical and horizontal dimensions toward the front of the vehicle while maintaining a rectangular cross section corresponding to the surge tank portion 20a, and a front-end square inlet 20c is open toward the front.
The left side skirt 15 is divided into two front and rear sides with the ram air box 20 having such a shape interposed therebetween. The rear side skirt 15b (second side skirt) is disposed at the rear side position of the ram air box 20 and forms a general flat plate that continues rearward from the ram air box 20 to the battery 17 and the inverter 18 side. It covers from the direction.

On the other hand, the front side skirt 15a (first side skirt) is arranged at the front side position of the ram air box 20, and has a shape for guiding the traveling wind flowing along the side of the vehicle to the inlet 20c of the ram air box 20. ing.
Specifically, the air guide portion 21 is recessed in the outer surface of the front side skirt 15a so as to have a cross-sectional shape opened leftward and extending in the front-rear direction. The air guide portion 21 has a shape in which the depth in the left-right direction is gradually increased toward the rear of the vehicle and the width in the vertical direction is gradually narrowed toward the rear of the vehicle, and the rear end thereof is the inlet 20c of the ram air box 20. It is connected.

Accordingly, the traveling wind flowing along the vehicle side portion is drawn into the air guide portion 21 in the left-right direction as it flows rearward and gradually gathers in the up-down direction, and then flows through the air guide portion 21 to ram air. Guided to the inlet 20c of the box 20. Further, although the ram air box 20 on the side of the vehicle can have air resistance, the front side skirt 15a prevents the collision of traveling wind against the ram air box 20, so that an effect of reducing air resistance can also be obtained.
A square-shaped opening 20d is formed on the right side surface of the surge tank 20a of the ram air box 20, and the above-described radiator 19 is disposed in the opening 20d. As shown in FIG. 2, the radiator 19 is connected to the traveling motor 6 and the inverter 18 via a conduit 22, and the cooling water in the radiator 19 circulates inside the traveling motor 6 and the inverter 18 by a pump (not shown). To cool.

A suction-type electric fan 23 is attached to the right side surface of the radiator 19, and when the electric fan 23 is operated, air in the surge tank portion 20 a passes through the radiator 19 and is discharged to the right side. Further, even when the electric fan 23 is stopped, if the pressure in the surge tank portion 20a is higher than that on the right side of the radiator 19, the air in the surge tank portion 20a passes through the radiator 19 due to the differential pressure before and after. Will be discharged to the right.
An open / close valve 24 (open / close means) is provided at the open end of the rear portion of the surge tank 20a (the opening of the present invention, hereinafter referred to as the downstream end 20e). The open / close valve 24 is driven by an open / close motor 25 about the vertical shaft 24a, and has a closed position for closing the downstream end 20e of the surge tank portion 20a shown in FIG. 3 and an open position for opening the downstream end 20e shown in FIG. It can be rotated between two positions.

  As shown in FIG. 3, the electric fan 23 and the opening / closing motor 25 are connected to a controller 26 (control means) for controlling the temperature of the traveling motor 6 and the inverter 18 as in-vehicle electrical equipment. A temperature sensor 27 for detecting 18 temperatures T is connected.

Next, the effect | action by the cooling structure of the electrical equipment for driving | running | working comprised as mentioned above is demonstrated.
While the vehicle is running, the electric fan 23 and the open / close motor 25 are controlled by the controller 26 based on a comparison between the inverter temperature T detected by the temperature sensor 27 and a temperature judgment value T 0 set in the vicinity of the upper limit temperature of the inverter 18 in advance. The That is, when the inverter temperature T is lower than the temperature determination value T0, the controller 26 stops the electric fan 23 and switches the open / close valve 24 to the closed position by the open / close motor 25. On the other hand, when the inverter temperature T is equal to or higher than the temperature determination value T 0, the controller 26 operates the electric fan 23 and switches the open / close valve 24 to the open position by the open / close motor 25.

In the present embodiment, the control is executed based on the inverter temperature T. However, the control is not limited to this. For example, the control may be performed based on the temperature of the traveling motor 6 or may be controlled based on the cooling water temperature of the radiator 19. May be.
Accordingly, when the inverter temperature T is lower than the temperature determination value T 0, the downstream end 20 e of the surge tank portion 20 a of the ram air box 20 is closed by the opening / closing valve 24. The traveling wind that flows along the left side of the vehicle is drawn into the air guide portion 21 of the front side skirt 15 a and guided to the inlet 20 c of the ram air box 20. The traveling wind at the time of introduction into the diffuser portion 20b of the ram air box 20 has a high dynamic pressure, but in order to gradually reduce the flow velocity as the passage cross-sectional area increases in the process of circulating in the diffuser portion 20b. The dynamic pressure of the traveling wind is converted into static pressure.
For this reason, when the traveling wind has a high static pressure when guided to the surge tank 20a through the diffuser 20b, the downstream end 20e of the surge tank 20a is closed by the opening / closing valve 24. The static pressure of the traveling wind acts substantially uniformly on the entire inside of the surge tank portion 20a.

  As a result, the pressure in the surge tank 20 a becomes higher than the outside, for example, the right side of the radiator 19, and a differential pressure is generated before and after the radiator 19. At this time, the electric fan 23 is not operating, but the traveling wind in the surge tank portion 20a passes through the radiator 19 due to the differential pressure across the air, and is exchanged with the cooling water in the radiator 19 and then discharged to the right side. The Therefore, the cooling water whose temperature has been reduced by the radiator 19 circulates sequentially through the traveling motor 6 and the inverter 18, thereby cooling these traveling electrical devices.

  The ram air box 20 at this time also plays a role of preventing a so-called short circuit of traveling wind. That is, when the high-temperature traveling wind exhausted from the radiator 19 goes directly to the front surface of the radiator 19 (the ram air box 20 side) and passes again through the radiator 19 (short circuit), the cooling efficiency of the radiator 19 is extremely lowered. End up. Such wraparound of the traveling wind is prevented by the ram air box 20, and low temperature traveling wind guided from the air guide portion 21 is introduced into the ram air box 20, so that the cooling efficiency of the radiator 19 can be further increased. .

As described above, during traveling of the vehicle, traveling wind is positively introduced into the ram air box 20 to be used for cooling the radiator 19 and the traveling motor 6 and the inverter 18 are overheated without operating the electric fan 23. Is prevented.
However, when the vehicle continues to run at low speed or stops, the cooling of the radiator 19 becomes insufficient as the travel wind decreases, and the temperature of the travel motor 6 and the inverter 18 begins to rise. At this time, when the inverter temperature T becomes equal to or higher than the temperature judgment value T0, the electric fan 23 is operated by the controller 26, the open / close valve 24 is switched to the open position, and the downstream end 20e of the surge tank portion 20a is opened.

By the operation of the electric fan 23, the air in the surge tank portion 20a of the ram air box 20 passes through the radiator 19 and is discharged to the right side. Only with the introduction port 20c of the diffuser part 20b having a small opening area, introduction of air into the surge tank part 20a is hindered, and the amount of air passing through the radiator 19 is reduced.
However, at this time, since the downstream end 20e of the surge tank portion 20a is opened by switching the opening / closing valve 24, external air is smoothly introduced into the surge tank portion 20a from the introduction port 20c and the downstream end 20e. , Thereby sufficiently cooling the radiator 19.

  Accordingly, the traveling motor 6 and the inverter 18 are suppressed from being overheated by the cooling water from the radiator 19, and when the inverter temperature T falls below the temperature judgment value T0, the electric fan 23 is stopped again by the controller 26 and the opening / closing valve 24 is closed. Switch to position. In the present embodiment, a single temperature determination value T0 is used, but two types of temperature determination values, high and low, may be applied in order to give hysteresis to the control.

  As described above, according to the cooling structure of the traveling electrical equipment of the present embodiment, the traveling wind is positively introduced into the ram air box 20 by the air guide portion 21 formed on the side skirt 15a, and the traveling wind is transmitted by the diffuser portion 20b. The dynamic pressure was converted to static pressure and then passed through the radiator 19 for cooling. As a result, even if the radiator 19 is disposed on the side of the vehicle where it is difficult to introduce the traveling wind, the electric fan 23 is activated when there is no risk of overheating of the traveling motor 6 or the inverter 18 (T ≦ T0). Without this, the radiator 19 can be cooled using the traveling wind. For this reason, it is only necessary to operate the electric fan 23 only when the traveling motor 6 or the inverter 18 may be overheated (T> T0), and the operating frequency of the electric fan 23 can be greatly reduced. . As a result, it is possible to reliably reduce adverse effects such as deterioration of fuel consumption due to power consumption of the electric fan 23 and noise to the surroundings.

Further, as is clear from the above description, conversion from dynamic pressure to static pressure by the diffuser portion 20b is indispensable for cooling the radiator 19 using traveling wind. However, since the opening area of the introduction port 20c is limited due to the shape of the passage of the diffuser portion 20b, the amount of air introduced into the ram air box 20 when the electric fan 23 is operated, and thus the amount of air passing through the radiator 19 is insufficient. Cause harmful effects.
In the present embodiment, since the downstream end 20e of the surge tank portion 20a is opened and closed by the opening / closing valve 24 in response to the operation / stop of the electric fan 23, not only the introduction port 20c but also the downstream end 20e when the electric fan 23 is operated. Also, external air is introduced into the ram air box 20. Therefore, after exhibiting the original function of the ram air box 20 that cools the radiator 19 using the traveling wind, it is possible to sufficiently cool the radiator 19 by solving the shortage of air amount when the electric fan 23 is operated, Accordingly, overheating of the traveling motor 6 and the inverter 18 can be prevented more reliably.

In addition, in this embodiment, the opening / closing valve 24 is disposed at the downstream end 20e in the surge tank portion 20a. As a result, as is apparent from FIGS. The opening / closing valve 24 is concealed from the side of the vehicle by 15b. Therefore, for example, the opening / closing valve 24 can be protected from muddy water during rainy weather and the like, and it can be protected from mischief by a third party, and the effect of preventing trouble of the opening / closing valve 24 due to these factors can be obtained.
However, the installation position of the opening / closing valve 24 is not limited to the above. For example, the opening / closing valve 24 may be disposed on the right side surface of the diffuser portion 20b (the front side position of the radiator 19), or the opening / closing valve 24 may be disposed on the left side surface of the diffuser portion 20b if it is not necessary to conceal it from the side of the vehicle. May be.

[Second Embodiment]
Next, a second embodiment in which the present invention is embodied in another cooling structure for electrical equipment for traveling will be described.
The truck to which the cooling structure for the electrical equipment for traveling according to this embodiment is applied is the same as that shown in FIGS. 1 and 2 described in the first embodiment, and the difference is that a flap 31 is added in the vicinity of the electric fan 23. It is to have done. Therefore, the same components are denoted by the same member numbers, description thereof is omitted, and differences will be described mainly.
6 is an enlarged plan view showing the ram air box 20 when the electric fan 23 is stopped, FIG. 7 is an enlarged plan view showing the ram air box 20 when the electric fan 23 is operated, and FIG. 8 is a ram air seen from the direction A in FIG. 3 is a perspective view showing a box 20. FIG.

  In the present embodiment, a flap 31 is disposed at a front position on the right side (discharge side) of the electric fan 23. The flap 31 extends in the vertical direction with the same blade cross section, and the vertical length thereof is set to be substantially the same as the vertical dimension of the radiator 19. The flap 31 is driven by a flap motor 32 about the vertical shaft 31a, and is positioned between two positions, that is, a restriction position in a posture facing the flow of traveling wind shown in FIG. 6 and a retracted position in a posture following the flow of traveling wind. It can be rotated. As shown in FIG. 6, the flap motor 32 is connected to the controller 26, and a vehicle speed sensor 33 that detects the vehicle speed V is connected to the controller 26.

  The flap 31 at the restriction position acts to generate a negative pressure on the downstream side, that is, on the right side of the radiator 19 by blocking the flow of the traveling wind. Further, the flap 31 at the retracted position does not generate negative pressure, and air resistance due to traveling wind is greatly reduced.

Next, the effect | action by the cooling structure of the electrical equipment for driving | running | working comprised as mentioned above is demonstrated.
Similar to the first embodiment, the controller 26 drives and controls the electric fan 23 and the opening / closing motor 25 based on the comparison between the inverter temperature T and the temperature determination value T0, and also controls the flap motor 32. That is, the controller 26 switches the flap 31 to the restricted position by the flap motor 32 when the inverter temperature T is lower than the temperature determination value T0 and the electric fan 23 is stopped. On the other hand, the controller 26 switches the flap 31 to the retracted position by the flap motor 32 when the inverter temperature T is equal to or higher than the temperature determination value T0 and the electric fan 23 is operating.
However, even if the inverter temperature T is less than the temperature determination value T0, the controller 26 switches the flap 31 to the retracted position when the vehicle speed V becomes equal to or higher than the preset vehicle speed determination value V0. The vehicle speed determination value V0 is set as a vehicle speed V near the lower limit at which the air resistance generated by the flap 31 at the restriction position can be allowed.

Therefore, when the electric fan 23 is operated with the inverter temperature T equal to or higher than the temperature determination value T0, the flap 31 is switched to the retracted position. At this time, since the air is forcibly passed through the radiator 19 by the electric fan 23, the cooling efficiency of the radiator 19 can be sufficiently obtained without generating a negative pressure. And the air resistance which the flap 31 generate | occur | produces by switching to a retracted position is reduced, and the fuel consumption deterioration by this is avoided beforehand.
When the inverter temperature T becomes less than the temperature determination value T0 and the electric fan 23 stops, the flap 31 is switched to the restricting position, and negative pressure is generated on the right side of the radiator 19. For this reason, the differential pressure across the radiator 19 is further increased, and the traveling wind in the ram air box 20 passes through the radiator 19 more smoothly, so that the cooling efficiency can be improved.

Even if the inverter temperature T is lower than the temperature determination value T0, the flap 31 is switched to the retracted position when the vehicle speed V becomes equal to or higher than the vehicle speed determination value V0. In this case, the demerit (increase in air resistance) is greater than the merit (increase in efficiency of the radiator 19) due to the flap 31, but such a situation can be avoided by switching to the retracted position, resulting in air resistance. It is possible to prevent the deterioration of fuel consumption due to the increase in fuel consumption.
Note that the switching control of the flap 31 based on the vehicle speed V is not necessarily performed. Therefore, when the inverter temperature T is lower than the temperature determination value T0, the flap 31 may be always held at the restriction position regardless of the vehicle speed V.

By the way, in each said embodiment, although the inlet 20c of the ram air box 20 was opened toward the front, and the driving | running | working wind was introduce | transduced, it is not restricted to this. For example, when the side skirts 15a and 15b are not disposed on the side portions of the vehicle, the traveling wind directly collides with the rear wheel 11 of the front shaft and the pressure (positive pressure) exceeding the atmospheric pressure is applied to the region E immediately before the rear wheel 11. generate.
Therefore, as shown in FIG. 9, the ram air box 20 may be disposed in front of the rear wheel 11 in a posture reverse to the above-described embodiment, and the introduction port 20 c may be positioned in the region E. Since a high pressure acts on the inlet 20c as compared with the right side of the radiator 19 to generate a pressure difference, traveling wind is introduced into the ram air box 20 from the inlet 20c in the region E to cool the radiator 19. To be served. Accordingly, even in this case, the same effect as that of the above-described embodiment can be obtained although not redundantly described.

This is the end of the description of the embodiment, but the aspect of the present invention is not limited to this embodiment. For example, in the above embodiment, the cooling structure of the electrical equipment for traveling of the hybrid type truck is embodied, but the target vehicle is not limited to this, and may be applied to, for example, a bus. Moreover, it is good also as an electric vehicle and a fuel cell vehicle instead of a hybrid vehicle, and it is good also as a cooling structure of the electrical equipment for driving | running | working in which those vehicles are mounted.
Further, in the above embodiment, the wind guide portion 21 is provided on the left side skirt 15a of the vehicle and the traveling wind is positively introduced into the ram air box 20, but the side skirt 15a and the wind guide portion 21 are not necessarily required. These members may be omitted.

15a Front side skirt (first side skirt)
15b Rear side skirt (second side skirt)
19 Radiator 20 Ram air box 20a Surge tank part 20b Diffuser part 20c Inlet 20e Downstream end (opening)
21 Air guide 23 Electric fan 24 Open / close valve (open / close means)
26 controller (control means)
31 flaps

Claims (5)

A diffuser portion that is disposed on the side of the vehicle and has a shape that gradually increases the cross-sectional area of the passage from the introduction port, and a surge tank portion that is connected to the diffuser portion. A ram air box which is introduced from the introduction port and converts the dynamic pressure of the traveling wind in the diffuser portion into static pressure and guides it into the surge tank portion;
An opening / closing means disposed in an opening on the surge tank portion side of the ram air box and capable of opening and closing the opening;
The ram air box is disposed in the surge tank section, allows the traveling air in the surge tank section to pass therethrough and exchanges heat with the cooling water inside, and the cooling water whose temperature is reduced by the heat exchange to the vehicle. A radiator that circulates in the mounted electrical equipment for traveling,
An electric fan attached to the radiator;
When the temperature of the electrical equipment for traveling is low, the electric fan is stopped and the opening / closing means is closed, and when the temperature of the electrical equipment for traveling is high, the electric fan is operated and the opening / closing means is opened. And a control unit for cooling the vehicle electrical equipment for driving the vehicle. A first side skirt is disposed at a front side position of the ram air box at a side of the vehicle;
2. The cooling structure for electrical equipment for traveling of a vehicle according to claim 1, wherein an air guide portion for guiding the traveling wind is formed in the inlet of the ram air box in the first side skirt. At the front position on the discharge side of the radiator, a flap that can be switched between two positions, a restriction position that opposes the flow of the traveling wind and a retracted position that follows the flow of the traveling wind,
The control means switches the flap to a restricted position when the temperature of the electrical equipment for traveling is low, and switches the flap to a retracted position when the temperature of the electrical equipment for travel is high. Or the cooling structure of the electrical equipment for driving | running | working of 2 of vehicles.   The control means switches the flap to the retracted position when the speed of the vehicle is equal to or higher than a preset vehicle speed judgment value even when the temperature of the electrical equipment for traveling is low. 3. A cooling structure for electrical equipment for traveling of a vehicle according to 3. The opening / closing means is disposed at a downstream end in the surge tank portion,
5. The vehicle travel vehicle according to claim 1, wherein a second side skirt is disposed at a rear side position of the ram air box at a side portion of the vehicle so as to continue rearward from the ram air box. Cooling structure for electrical equipment.

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