JPH05301528A - Ventilation system for automobile engine room - Google Patents

Abstract

(57) [Summary] (Modified) [Purpose] By rectifying the airflow inside and outside the engine room and reducing the air resistance of the airflow inside the vehicle, the hot air in the engine room is effectively discharged and the engine output is improved. Try.
Further, in the case of a vehicle with an intercooler supercharger, the acceleration performance at the time of temporary stop or low speed is improved. [Structure] A ventilation device for an automobile engine room with a supercharger, in which a ventilation obstacle is eliminated between the intercooler 11 and a scavenging fan 15 located downstream of the intercooler 11, and an airflow passing through the intercooler is moved by an airflow upstream of the scavenging fan. .. Or, the scavenging fan is arranged so that the rotation axis is almost aligned with the center of the intercooler. An under cover is provided to guide the outside air to the intercooler. An under cover 10 is provided with a duct portion that guides an air flow passing through the radiator 8 cooling fan 8a located in front of the radiator 8 toward the rear of the intercooler. Further, a guide 6 for guiding the air passing through the radiator to the scavenging fan is provided to improve the scavenging effect.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ventilation system for an automobile engine room, and more particularly to a ventilation system for an automobile engine room which efficiently discharges hot air in the engine room to the outside.

[0002]

2. Description of the Related Art Recently, in an automobile engine room, an increase in the volume of an engine body, an anti-lock brake device, etc. due to a multi-cylinder engine, a DOHC, a multi-valve engine, a complicated intake manifold including a supercharging system, etc. It has become denser due to the expansion and is becoming narrower. On the other hand, there is a tendency to add an under cover to the engine room in order to reduce air resistance, prevent noise generation, and prevent damage due to rocks and the like. Therefore, unless the hot air generated from the main cooling system auxiliary equipment such as radiators, air conditioner condensers, supercharger intercoolers, etc. is discharged to the outside of the engine room, the cooling efficiency of these will decrease and the engine output will also decrease. become. There is also a problem that rubber and plastic parts in the engine room must have higher heat resistance.

Therefore, various ventilation systems for automobile engine rooms have been proposed.

For example, there is an example in which a scavenging fan is provided at the rear of the engine room as in Japanese Utility Model Laid-Open No. 63-14426.

However, the conventional ventilator for an automobile engine room does not have the technical idea of rectifying the air flow, and is not necessarily highly efficient. Especially in a cab-over type vehicle with a narrow engine room, it is extremely effective to reduce the air resistance inside and outside the engine room at low speed or at rest so that the scavenging fan driven by an electric motor with a small output can achieve a sufficient cooling effect. is important.

As far as the present inventors know, such a technical idea has not been known yet.

[0007]

It is an object of the present invention to rectify the airflow inside and outside the engine room and reduce the air resistance of the airflow inside the vehicle, so that the hot air in the engine room is effectively discharged and the temperature inside the engine room is lowered. It is to improve the engine output.

Another object of the present invention is to improve the acceleration performance when the vehicle is equipped with an intercooler supercharger when the vehicle is temporarily stopped or at a low speed.

[0009]

According to the present invention, in a ventilator for an automobile engine room with a supercharger, which is provided with a scavenging fan for discharging the air in the engine room to the outside of the engine room, the intercooler is located downstream of the intercooler. A ventilation device for an automobile engine room with a supercharger, characterized in that a ventilation obstacle is eliminated between the scavenging fans, and the airflow passing through the intercooler is moved by the airflow upstream of the scavenging fan (Claim 1). The ventilation device for an engine room according to claim 1, wherein an intercooler is arranged below the room, and a scavenging fan is arranged downstream of the intercooler and the rotation axis direction of which is substantially coincident with the center of the intercooler (claim 2). ), The undercover provided under the intercooler is expanded toward the inside of the engine room to form the duct section. The ventilation device for an engine room according to claim 2, wherein the outside air is guided to the intercooler through the duct part (claim 3), the duct part is generated by a radiator cooling fan arranged in the front or dynamic pressure. A duct is provided for guiding the airflow to the rear of the intercooler, and a guide is provided between the radiator of the engine room according to claim 2 (claim 4) and the scavenging fan arranged downstream of the radiator to cool the radiator and the radiator. A ventilation device for an automobile engine room (claim 5), characterized in that the air that has passed through the fan for ventilation is guided to the upstream side of the scavenging fan.

The present invention will be described in detail below with reference to examples.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows the first embodiment of the invention in a one-box type vehicle
It is a side sectional view of an example (engine room).

FIG. 2 is a front view showing the intake system of the same embodiment, FIG. 3 is a side sectional view of another embodiment, and FIG. 4 is a side sectional view of a conventional example.

In FIGS. 1, 2, and 3, 1 is an engine, 2 is
Is an indoor engine cover, 4 is a hood, 5 is a bumper, 6 is a guide, 7 is a louver or damper, 8 is a radiator, 9 is a passenger seat, 10 is an undercover, 11 is an intercooler, 12 is a duct part, 15 is a A scavenging fan, 18 is an opening, and 20 is a turbocharger.

Reference numerals 21, 22, 23 and 24 are intake pipes and 2
5 is an air cleaner, 26 is an exhaust pipe, and 100 is a temperature sensor.

In FIG. 1, the air entering the vehicle from an air intake (not shown) near the front bumper first passes through the radiator 8 and the radiator cooling fan to cool the engine coolant. Undercover 10 on the bottom of the vehicle
A and 10B are attached to the body and extend at least from the front radiator to the vicinity of the clutch casing at the rear end of the engine. The power train from the vicinity of the transmission behind the clutch casing to the rear axle is exposed, which facilitates daily maintenance and inspection, and forms an opening 18 which is a large-area hot air exhaust hole.

The front portion 10A of the undercover has a duct portion 12 which is a gradual wing-shaped cross section and which is a hole-like air intake for an intercooler and which is formed in the center with a smooth curve.

In particular, the duct portion 12 is designed to rectify the traveling wind and efficiently take in cooling air by means of the front portion 10A of the undercover having a smooth wing-shaped cross section. Next, the guide 6 extends rearward from above the rear side of the shroud of the radiator 8 and continues to the scavenging fan 15 continuously or partially. The electric scavenging fan 15 is arranged so that its rotation axis direction is substantially on the center line of the intercooler 11. In this embodiment, the tilt angle θ is 0 ° to 30
It is ゜.

Further, a louver or damper 7 is provided at the rear portion of the guide 6 as shown in the drawing, and when the internal pressure in the area surrounded by the guide 6 and the front portion 10A of the undercover increases due to dynamic pressure or the like, cooling air is used. Flows into the upper part of the engine room.

Here, the duct portion 12 and the guide 6 are substantially the same in the function of guiding the air flow, and are distinguished only in that the duct portion is a part of the under cover.

Since the upper part of the rear of the indoor engine cover 2 is usually the hottest point, the temperature sensor 100 is arranged inside it and the scavenging fan 1 is provided when the hot airflow reaches a preset temperature.
Switch 5 is turned on automatically.

The guide 6 and the under covers 10A, 1
The cooling air passage surrounded by 0B constitutes a kind of venturi that becomes the narrowest in the vicinity of the scavenging fan 15, and it is possible to perform scavenging in the engine room with extremely high efficiency both when stationary and while running.

As described above, the power train portion at the rear of the engine room has a smaller volume than the engine body 1 and thus has a large gap, and it goes without saying that it functions as an opening 18 having a large area.

FIG. 2 is a plan view showing the engine air supply system. Fresh air supplied from the vicinity of the front radiator passes through an intake pipe 21, an air cleaner 25, and an intake pipe 22 and is a turbocharger (a supercharger). Also good.) 20
The compressed air is sent to the intercooler 11 through the intake pipe 23, cooled by several tens of degrees in the intercooler 11, and becomes highly dense air, which is supplied from the intake pipe 24 to the intake manifold.

FIG. 3 is a side sectional view showing another embodiment. In FIG. 3, in this embodiment, the ventilation direction of the intercooler 11 and the scavenging fan rotation axis are non-parallel, and the intercooler 11 and the scavenging fan 15 are connected by a duct formed by the guide 11A and the rear undercover 10B. The place is different. It is also possible to further extend the rear portion 10B of the undercover together with the first and second embodiments to narrow the exhaust opening 18 of the engine room and add another scavenging fan. As a third embodiment, the intercooler is omitted from the first and second embodiments, and even in an engine room with a supercharger without an intercooler or a naturally aspirated engine, an automobile engine room equipped with a venturi effect and a scavenging fan is used. Ventilation equipment can be provided.

[0025]

In the first aspect of the present invention, the ventilation obstacles between the intercooler and the scavenging fan downstream of the intercooler are eliminated,
Because the airflow upstream of the scavenging fan moves the airflow that passes through the intercooler, there is no hot air in the narrow engine room, and the cooling effect is good. In the case of claim 2, since the scavenging fan is arranged such that the center of the intercooler and the direction of its rotation axis are substantially aligned with each other, the cooling efficiency of the intercooler is further increased. In the third aspect, the outside air flows along the duct portion of the undercover and is guided to the intercooler, so that the cooling efficiency of the intercooler becomes high. In the case of claim 4, the inner surface of the duct portion of the under cover guides an air flow generated by a radiator cooling fan arranged in the front or a dynamic pressure to a rear side of the intercooler to accelerate the flow velocity to reduce the pressure, and the air flow passing through the intercooler. Promote the discharge of. In the case of the fifth aspect, the air that has passed through the radiator and the radiator cooling fan is guided to the upstream side of the scavenging fan by the guide, so that the scavenging efficiency is increased regardless of the presence or absence of the intercooler and the supercharger.

[0026]

According to the present invention, all the above objects can be achieved. That is, the hot air in the engine room can be effectively discharged, the temperature in the engine room can be lowered, and the engine output can be improved. Further, particularly in the case of a vehicle with an intercooler supercharger, it is possible to improve the acceleration performance from a temporary stop or a low speed.

[Brief description of drawings]

FIG. 1 is a side sectional view of a first embodiment.

FIG. 2 is a plan view of the intake system of the embodiment.

FIG. 3 is a side sectional view of the second embodiment.

FIG. 4 is a side sectional view of a conventional example.

[Explanation of reference numerals] 1 engine 2 indoor engine cover 6 guide 7 louver or damper 8 radiator 10A under cover 10B under cover 11 intercooler 12 duct part 15 scavenging fan 18 opening part

Claims (5)

[Claims] 1. A ventilation device for an automobile engine room with a supercharger, comprising a scavenging fan for discharging the air in the engine room to the outside of the engine room, between an intercooler and a scavenging fan downstream of the intercooler. A ventilator for a car engine room with a supercharger, characterized by eliminating ventilation obstacles and allowing the airflow passing through the intercooler to move the airflow upstream of the scavenging fan. 2. The engine room according to claim 1, wherein an intercooler is arranged below the engine room, and a scavenging fan is arranged downstream of the intercooler and the rotation axis direction of which is substantially coincident with the center of the intercooler. Ventilation equipment. 3. The engine according to claim 2, wherein an undercover provided below the intercooler is bulged toward the inside of the engine room to form a duct portion, and outside air is guided to the intercooler through the duct portion. Room ventilation system. 4. A ventilation device for an engine room according to claim 2, wherein the duct portion is a radiator cooling fan arranged in the front or a duct portion which guides an air flow generated by a dynamic pressure to the rear of the intercooler. 5. A vehicle engine room characterized in that a guide is provided between a radiator and a scavenging fan arranged downstream of the radiator to guide the air passing through the radiator and the radiator cooling fan to the upstream side of the scavenging fan. Ventilation equipment.