JP3362895B2 - Vehicle engine room layout structure - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle engine room arrangement structure.

[0002]

2. Description of the Related Art In order to improve the running characteristics of a vehicle, there are known methods for improving power performance, reducing weight, minimizing yaw moment of inertia, uniforming front-rear weight distribution, lowering the center of gravity, and the like. Various typical proposals have been made on front mid-ship vehicles for front-wheel drive vehicles and mid-ship vehicles for rear-wheel drive vehicles.However, improving aerodynamic characteristics is also a very effective method. Reducing the CD value is being performed in high performance vehicles.

On the other hand, in order to improve the output of the engine, it is indispensable to introduce more fresh air into the combustion chamber of the engine. Ideally, an opening for introducing fresh air is provided in the front of the vehicle. In advance, an air duct communicating with the opening may be provided so that the outside air is introduced into the air cleaner by the ram pressure generated as the vehicle travels.
Snow, dust, etc. are also introduced with the outside air and cannot be easily realized.

Therefore, by disposing the outside air introduction duct at a side portion of the headline unit as in "Intake duct mounting structure for automobiles" of Japanese Utility Model Laid-Open No. 1-165719, splash, snow, dust, etc. At the same time, a proposal has been made to prevent the air cleaner from being introduced into the air cleaner.

Further, in recent years, in order to improve the engine output and realize an ideal intake state over the entire engine speed range, for example, an intake duct having a relatively long duct length at low engine speed is used. There is also known a technique in which outside air is introduced via an intake air duct having a relatively short duct length while the engine is rotating at a high speed.

Further, in order to improve the power performance, a rotary engine whose vertical height can be set extremely small in order to reduce the weight of the vehicle, minimize the generation of the yaw moment of inertia, and achieve a low center of gravity, It must be installed close to the passenger compartment.

[0007]

However, in the above proposal, since the outside air introducing duct is arranged at the side portion of the headline unit, the front projection area becomes large and the CD value is set small. There is a problem that can not be done. Further, if the slant nose is used to improve the CD value as described above, there is a problem that it is difficult to provide a space for providing two types of ducts, long and short, for improving engine performance.

Further, by providing a rotary engine whose vertical height can be set extremely small as close to the passenger compartment as possible, it is possible to minimize the yaw moment of inertia and lower the center of gravity. When the rotary engine is installed in the so-called front midship state,
There is a problem that it becomes difficult to cool around the exhaust pipe of the engine and the auxiliary devices such as the battery with running wind.

Therefore, the vehicle engine room arrangement structure of the present invention has been made in view of the above problems, and the purpose thereof is to make a slant nose to reduce the front projection area and to reduce the CD value. Can be set to a small value, and at least 2
The point is to be able to provide different types of ducts.

Furthermore, when a rotary engine or the like whose vertical height direction can be set to be extremely small is provided as close to the vehicle interior as possible, when the yaw moment of inertia is minimized and the center of gravity is lowered, the engine is used. It is an object of the present invention to make it possible to effectively cool the surroundings of the exhaust pipe and batteries and other auxiliary devices even with running wind.

[0011]

[Means for Solving the Problems] and

In order to solve the above-mentioned problems and achieve the object, according to the present invention, there is provided an engine room arrangement structure for a vehicle for inhaling air to an engine arranged in a front engine room. An air duct that opens in the front opening and extends in the vehicle front-rear direction; an air cleaner that is disposed behind the air duct; and an engine that has an intake portion that is disposed behind the air cleaner, Front surface of each of the air duct, the air cleaner, and the engine
The performance of the engine is improved by arranging them in series in the vehicle front-rear direction so that all of the projection planes substantially overlap with each other, and by disposing the exhaust system of the engine or auxiliaries on the side of the engine. Try to do it.

Also, preferably, in the front engine room
The engine engine of the vehicle that takes in air to the engine
A structure for arranging an armature, which is opened at the front opening of the vehicle.
The adduct and the air duct disposed behind the air duct.
It is installed in the rear of the air cleaner and the air cleaner.
And an engine having an intake portion, the air duct
And the air cleaner and the engine in the vehicle longitudinal direction
They are arranged in series, and the side part of the engine is
An exhaust system of an engine or auxiliary equipment is arranged, the air duct is opened at one end of the front opening, and is extended in the width direction of the vehicle body. The first air duct is opposite to the first air duct opening portion. A second air duct that opens at the other end of the front opening on the side and extends in the vehicle front-rear direction and communicates with the first air duct; and a state of performing intake air to the engine through the second air duct. The engine performance is improved by including switching means for switching to a state in which intake air is introduced into the engine through the first air duct in accordance with the engine load state.

[0013] Further, preferably, the vehicle includes a duct member opened at a front opening of the vehicle and an opening formed at a side surface of the duct member, and the exhaust system or the auxiliary device is provided near the opening. By arranging the class, it works to cool by the running wind.

Further, preferably, the duct member is a front frame of the vehicle and also serves as the duct member.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is an external perspective view showing a schematic configuration of the embodiment, and shows a state in which a vehicle 1 is viewed from the front right side.

In the figure, the vehicle body 1 whose outline is shown by the alternate long and short dash line in the figure has a front engine room 17 having an inclined surface inclined toward the front of the vehicle, as shown in the figure. The front edge portion 1e slants to a position close to the ground so that the CD value can be reduced.

As described above, the front edge portion 1e slants to a position close to the ground, which has the advantage of ensuring the visibility of the lower front portion, but it has an important shock absorbing function during a frontal collision. Since the front bumper cannot be provided at the front edge 1e, the floating bumper 3 is provided above the front edge 1e. Both ends of the floating bumper 3 are integrally formed (at least in appearance) at the left and right portions of the vehicle body 1 as shown in the figure, and a front opening 4 is provided between the front edge portions 1e.

With the above-described structure, most of the traveling wind F1 that passes through substantially the center of the front opening 4 of the traveling wind.
Is the running wind F4 along the bonnet line of the vehicle body 1.
As it flows backwards. Further, the traveling winds F2 and F3 that hit the left and right end portions 4a and 4b of the front opening portion 4 become turbulent flows, stagnant at each part, and a drag flow is formed.

Next, a pair of front frame portions 2 are provided along the front-rear direction of the vehicle body 1 and perform a significant function as a buffer member at the time of a frontal collision, and are sandwiched between the front frame portions 2. The rotary engine 10 is mounted inside a tunnel portion that is a space that is close to the passenger compartment or a dash panel. As shown in the figure, the rotary engine 10 has an intake surge tank 9 provided on the upper side thereof, and an exhaust pipe 11 continuous to each cylinder on the left side thereof so as to guide exhaust gas to the rear of the vehicle through a collecting pipe 12. Is configured.

In order to improve the output of the engine 10 arranged as described above, it is necessary to introduce more fresh air into the surge tank 9, so that the air duct 9a communicating with this surge tank 9 is provided. An air cleaner 8 is provided in front of the vehicle. The first air duct 6 that introduces the outside air into the air cleaner 8 is provided in the lower right portion of the air cleaner 8 while facing the front of the vehicle as shown in the drawing, and the opening 6a is located at the right end of the front opening 4 described above. Engine room 17 of section 4a
It is provided so as to be located near the inside.

On the other hand, the opening 6a of the first air duct 6
As shown in the drawing, there is a second air duct 5 disposed right behind the vehicle along the lateral width direction of the vehicle body 1, and an outside air introduction portion having a total length of about 700 to 800 mm is provided. The opening 5a is provided so as to be located near the inside of the engine room 17 at the left end 4b of the front opening 4 described above.

As shown in FIG. 2 which is a sectional view taken along the line CC in FIG. 1, the second air duct 5 is provided with a communicating portion 5c communicating with the upper surface of the second air duct 6,
The fresh air introduced from the opening 5a of the air duct 5 can be introduced into the first air duct 6 via the communication portion 5c.

As shown in the figure, an arrow D is attached to the communicating portion 5c.
A flap 16 that is rotated and opened / closed so as to be driven in the D1 and D2 directions is rotatably supported by a shaft body 16a, and a worm wheel 7a fixed to an end portion of the shaft body 16a is shown by a broken line as shown in FIG. By a predetermined drive by a worm fixed to the actuator 7, the outside air is introduced directly into the air cleaner 8 from the first air duct 6 and the outside air is introduced into the air cleaner 8 through the communicating portion 5c of the second air duct 5. It can be set appropriately depending on the state.

In the configuration described above, in the operation explanatory view of FIG. 3, the outside air is exposed to the respective ducts 5a, as indicated by broken lines.
6a, for example, the outside air is introduced through the first air duct 5 having a relatively long duct length when the vehicle is stopped or operating at low speed and the engine is running at low speed. Therefore, by driving the actuator 7 and holding the flap 16 at the position shown by the solid line in FIG. 3,
The length of the intake passage can be set longer to reduce noise generated during intake.

On the other hand, when the vehicle is running at high speed and the engine is running at high speed, the duct length is relatively short, and the running wind can be introduced into the direct air cleaner 8 through the second air duct 6. Flap 1 at the position shown by the broken line in FIG.
The actuator 7 is driven so as to move 6 so that the communication portion 5c is closed. As a result, the outside air introduction efficiency is improved, and the output can be increased at the time of high speed rotation.

Further, since the outside air is introduced from the turbulent flow generation site as described above, the occurrence of turbulence can be reduced and at the same time the aerodynamic characteristics can be improved.

Next, referring to FIG. 3, the rotary engine 10
Is provided in a space sandwiched by the front frame portion 2, and an exhaust pipe 11 continuous to each cylinder is provided on the left side to guide exhaust gas to the rear of the vehicle in the collecting portion 12. Therefore, it is difficult to cool the vehicle by directly applying traveling wind.

Further, relatively heavy items such as engine accessories such as dynamos and air pumps and batteries are preferably installed near the vehicle compartment side near the center of gravity of the vehicle in order to reduce the yaw moment of inertia. However, as a result of being unable to secure a sufficient height dimension in front of the vehicle for installing the engine auxiliary devices and batteries for the slant nose described above, these auxiliary devices are inevitably provided at positions close to the passenger compartment side. It will be.

Since it is difficult to cool the exhaust portion of the engine and the auxiliary devices which are arranged as described above by the traveling wind, the traveling wind is guided to the respective arrangement positions. Is provided.

First, regarding the cooling of the exhaust portion, in FIG. 1, an opening 2a is provided on the left side of the front frame portion 2 so as to open toward the front of the vehicle, and the running wind inside the frame is reduced. Is passed and is guided by the deflector 2f so as to be directed to the engine 10 side at the first opening 2e.

Further, as shown in the figure, the battery 13 placed on the front frame 2 in a mounted state is provided in the cover body 14 so as to keep a predetermined interval on the outer peripheral surface,
A second opening provided on the upper surface of the front frame 2
The opening 2g communicates with the inside of the cover body 14 so that the outside air introduced into the front frame through the above-mentioned opening 2a can be introduced into the cover body 14 as shown by the broken line in FIG. There is. For this reason, in FIG. 4 which is a sectional view taken along the line BB of FIG.
The protrusions 14e are provided on the inner wall surface and the bottom surface of the battery 4, and a gap H is provided on the outer peripheral surface of the battery 13 other than the upper surface thereof. By cooling the above, even if the battery 13 is provided at a position close to the exhaust portion of the engine 10 which is in a high temperature state, it is possible to prevent deterioration of the battery.

Although not shown, the other auxiliary devices are also configured to guide the traveling wind through the inner portion 2h of the front frame 2 in a predetermined manner to appropriately cool them, thereby increasing the degree of freedom in disposing the engine. . With the configuration as described above, when the slant nose is used, the engine can be brought closer to the yaw moment of inertia generation center to realize a low yaw moment of inertia generation.

The invention of the present application described above is not limited to the configurations of the above-described embodiments, and it goes without saying that the setting can be appropriately changed without departing from the scope of the invention, and the engine is a rotary type. Not limited to the engine,
Even if it is replaced with a normal reciprocating engine, the same effect can be obtained.

[0034]

As described above, according to the present invention,
An air duct that enables slant nose and a small front projection area to set a small CD value, and that introduces outside air in the vehicle longitudinal direction to improve engine performance.
Can be done more effectively via Furthermore, when the engine and other components are installed as close to the passenger compartment as possible, the yaw moment of inertia is minimized and the center of gravity is lowered. It can be performed effectively even with running wind.

[0035]

[Brief description of drawings]

FIG. 1 is an external perspective view of a schematic configuration of an embodiment.

FIG. 2 is a sectional view taken along the line CC of FIG.

FIG. 3 is an operation explanatory diagram of FIG. 1.

FIG. 4 is a sectional view taken along the line BB of FIG.

[Explanation of symbols]

1 body, 2 front frame, 3 front bumper, 4 front opening, 5 First air duct, 5a opening, 6 second air duct, 6a opening, 7 Actuator, 8 air cleaner, 10 engines, 11 exhaust, 13 batteries, 14 cover body, 16 flaps.

─────────────────────────────────────────────────── ─── Continuation of the front page (58) Fields surveyed (Int.Cl. ⁷ , DB name) B60K 13/00-13/06

Claims (4)

(57) [Claims] 1. An engine room arrangement structure for a vehicle that inhales air to an engine provided in a front engine room, the air duct opening in a front opening of the vehicle and extending in a vehicle front-rear direction . And an air cleaner disposed behind the air duct, and an engine having an intake portion disposed behind the air cleaner, the air duct, the air cleaner, and front projection surfaces of the engine.
Are arranged in series in the vehicle front-rear direction so as to substantially overlap each other, and an exhaust system of the engine or auxiliaries is arranged on a side portion of the engine. Arrangement structure. 2. An engine installed in a front engine room.
It is a structure for arranging the engine room of the vehicle that takes in air to the gin.
The air duct opened at the front opening of the vehicle and the air duct.
An air cleaner disposed behind the adduct,
It had an air intake part arranged behind the air cleaner.
An engine, and the air duct and the air cleaner.
And the engine are arranged in series in the vehicle front-rear direction.
And the exhaust system of the engine on the side of the engine.
Alternatively, auxiliary machinery is provided, the air duct is opened at one end of the front opening, and the first air duct extends in the width direction of the vehicle body; and the front surface opposite to the first air duct opening portion. A second air duct which is opened at the other end of the opening and extends in the vehicle front-rear direction and communicates with the first air duct; a state where air is taken into the engine through the second air duct; An engine room layout structure for a vehicle, comprising: switching means for switching to a state where air is taken into the engine via an air duct in accordance with an engine load state. 3. A duct member having an opening in a front opening of the vehicle, and an opening formed in a side surface of the duct member, wherein the exhaust system or the auxiliary device is arranged near the opening. The engine room layout structure for a vehicle according to claim 1, wherein the engine room layout structure is provided. 4. The engine compartment arrangement structure for a vehicle according to claim 3, wherein the duct member is a front frame of the vehicle.