JP2000280762A - Vehicular engine room cooling system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To effectively cool the inside of an engine room by arranging a suction duct for introducing vehicle front side outside air into the engine room and an exhaust duct for exhausting air in the engine room to the outside in an engine room cooling system for enclosing an underfloor engine by a noise cover. SOLUTION: A radiator 3 and a cooling fan 4 are arranged in front of an engine 2 arranged under a cab floor of a vehicle such as a cab truck, and a rear cover 5 as a noise cover is arranged in the rear of the engine 2. Side covers 6, 7 are arranged on both sides and the lower side of the engine 2, and an engine room 9 is formed thereby. In this case, a side cover 6 is provided with a suction duct 10 for introducing vehicle front side outside air into the engine room 9 toward the upper side from the lower side of the vehicle. While, an upper part of the rear cover 5 is provided with an exhaust duct 12 for exhausting air in the engine room 9 to the outside, and a fan 13 is interposed in this exhaust duct 12.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an engine room cooling device for a vehicle in which an engine is surrounded by a noise cover.

[0002]

2. Description of the Related Art For example, in a vehicle such as a cab truck, a noise cover is provided on a side and a lower side of the engine so as to reduce noise from the engine so as to cover the engine periphery together with a cab floor above the engine. ing.
In this case, the air warmed by passing through the radiator in front of the engine flows around the engine to the rear of the engine room surrounded by the noise cover and the cab floor.

[0003]

However, in the prior art, there is no outlet for the air flowing behind the engine room, and the ambient temperature inside the engine room may partially exceed 130 ° C. For this reason, it is necessary to improve the heat resistance of each component in the engine room, for example, by using a heat-resistant harness provided in the engine room, which is one of the causes of cost increase.

As a cooling technique for an engine room, for example, Japanese Utility Model Laid-Open No. 7-8036 and Japanese Patent Laid-Open No. 8-34247.
And Japanese Patent Application Laid-Open No. 6-33719. However, the technology disclosed in Japanese Utility Model Laid-Open No. 7-8036 and Japanese Utility Model Laid-Open No. 6-33719 is configured to only discharge high-temperature air behind the engine room. The technique disclosed in Japanese Patent Application Laid-Open No. 8-34247 is for cooling an engine room by improving the capacity of a radiator.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and provides a vehicle engine room cooling device capable of effectively cooling the engine room by creating a cool air flow around the engine in the engine room. The purpose is to provide.

[0006]

According to a first aspect of the present invention, there is provided an engine room cooling system for a vehicle in which an engine under a floor is surrounded by a noise cover. An intake duct is introduced into the engine room, and an exhaust duct is provided on the engine room wall behind the engine to exhaust air in the room to the outside.

In such a configuration, cold outside air on the front side of the vehicle is introduced into the engine room through the intake duct, and is discharged outside through the discharge duct behind the engine through the periphery of the engine. Therefore, a flow of cold air can be generated in the engine room, and the engine room can be effectively cooled.

[0008] According to a second aspect of the present invention, a fan is provided in the exhaust duct, and temperature detecting means for detecting the temperature in the engine room is provided. The fan is driven when the temperature detected by the temperature detecting means is equal to or higher than a predetermined temperature. With this configuration, forced cooling is possible when the temperature in the engine room is high.

Further, if the discharge duct is arranged above the wall of the engine room, it is easy to discharge the high-temperature air above the engine room.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIG.
3 to FIG. 1 to 3, a radiator 3 and a cooling fan 4 are arranged in front of an engine 2 arranged below a cab floor 1, and a rear cover 5 as a noise cover is provided behind the engine 2. Further, on both sides and below the engine 2, from the radiator 3 to the rear cover 5, there are provided side covers 6, 7 and an under cover 8 which constitute a noise cover together with the rear cover 5. The cab floor 1, the rear cover 5, the side covers 6, 7, and the undercover 8 form an engine room 9 surrounding the engine 2.

In the present embodiment, as shown in FIG. 3, the front side cover 6 is inclined so that outside air on the front side of the vehicle is introduced into the engine room 9 from the lower side to the upper side of the vehicle, as shown in FIG. An intake duct 10 is provided. Suction duct 10
Is provided with a filter 11 for preventing foreign matter such as mud from entering from outside. Note that the suction duct 10 may be formed integrally with the side cover 6 or may be formed separately. Also, it may be arranged on the opposite side cover 7,
It may be provided on both side covers 6 and 7.

A discharge duct 12 for discharging the air in the engine room 9 to the outside is provided above the rear cover 5. A fan 13 is interposed in the discharge duct 12. The fan 13 is connected to the battery 1 via a thermo switch 14 as a temperature detecting means for detecting the temperature in the engine room.
5 is connected. When the temperature in the engine room 9 reaches a predetermined temperature, for example, 120 ° C. or higher, the thermoswitch 14 is turned on to apply the voltage of the battery 15 to the fan 13. The exhaust duct 12 may be mounted anywhere on the rear cover 5, but since the warmed air tends to accumulate in the upper portion of the engine room 9, it is preferable to arrange the exhaust duct 12 on the upper portion of the rear cover 5. Inlet duct 10 is provided so that air introduced from 10 crosses engine room 9.
It is preferable to arrange them at substantially diagonal positions. In addition, 16 is a front bumper, 17 is a side frame, and 18 is a cab mount.

Next, the operation of the engine room cooling device according to this embodiment will be described. Warm air flows from the radiator 3 through the cooling fan 4 to the rear of the engine room 9 around the engine 2. Outside air is also directly introduced from the intake duct 10 into the engine room 9 through the filter 11. At this time, even if the outside air contains foreign matter such as mud, it can be removed by the filter 11. The outside air from the intake duct 10 is introduced into the upper space of the engine room 9 as shown by the arrow in FIG. 3 and substantially crosses the periphery of the engine 2 at the rear of the engine room 9 as shown by the arrow in FIG. It goes to the discharge duct 12 arranged at a corner position. The air flowing to the rear of the engine room 9 is discharged to the outside through the discharge duct 12.

The ambient temperature in the engine room 9 is 120
When the temperature becomes equal to or higher than ° C., the thermo switch 14 is turned on, the fan 13 in the discharge duct 12 operates, and the air in the engine room 9 is forcibly discharged.

As described above, in the cooling device of the present embodiment,
A flow of cold external air can be created in the engine room 9 and the inside of the engine room 9 can be effectively cooled. Therefore, an increase in the ambient temperature in the engine room 9 can be suppressed, and heat damage to each component in the engine room 9 can be prevented. Also, the cooling performance of the engine is improved.

The temperature detecting means is not limited to the thermoswitch, but may be configured so that the temperature detection signal of the temperature sensor is input to the controller and the operation of the fan 13 is controlled by a signal from the controller. Further, the fan in the discharge duct may not be necessarily provided.

[0017]

As described above, according to the first aspect of the present invention, the flow of cold air can be positively created in the engine room, so that the hot air does not stay in the engine room and the atmospheric temperature is maintained. Can be effectively suppressed, heat damage to each part in the engine room can be prevented, and cost increase accompanying improvement in heat resistance of parts in the engine room can be suppressed. In addition, the cooling performance of the engine can be improved.

According to the second aspect of the present invention, since the fan operates at a predetermined temperature or higher, the ambient temperature of the engine room can be controlled, and the rise in the ambient temperature of the engine room can be suppressed more reliably.

According to the third aspect of the present invention, since air can be discharged from the upper part of the engine room where high-temperature air easily accumulates, it is possible to effectively suppress an increase in the ambient temperature of the engine room.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram showing an embodiment of a vehicle engine room cooling device according to the present invention.

FIG. 2 is an operation explanatory diagram of the embodiment when viewed from above.

FIG. 3 is an explanatory diagram of the operation when the embodiment is viewed from the side.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Cab floor 2 Engine 5 Rear cover 6, 7 Side cover 8 Under cover 9 Engine room 10 Intake duct 12 Exhaust duct 13 Fan 14 Thermo switch

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) F01P 7/04 F01P 7/04 Q

Claims (3)

[Claims] In an engine room cooling system for a vehicle, in which an engine under the floor is surrounded by a noise cover, an intake duct for introducing outside air on the front side of the vehicle into the engine room is provided. An engine room cooling device for a vehicle, comprising a discharge duct for discharging air to the outside. 2. A structure in which a fan is provided in the exhaust duct, temperature detecting means for detecting the temperature in the engine room is provided, and the fan is driven when the temperature detected by the temperature detecting means is equal to or higher than a predetermined temperature. An engine room cooling device for a vehicle according to claim 1. 3. The engine room cooling system for a vehicle according to claim 1, wherein the exhaust duct is arranged above an engine room wall.