JPH08142921A - Underguard structure for vehicle - Google Patents

Abstract

PURPOSE: To prevent the deterioration of the travel safety of a vehicle, with the sufficient flow of a cooling wind into an, engine room kept, by equipping an opening/closing cover, for opening/closing an opening part for introducing a cooling wind, provided on an underguard; and a control plate for controlling the flow of the cooling wind into the opening part provided on the under part of an opening part. CONSTITUTION: At the time of the travel of a vehicle on an expressway etc., a control plate 2 is stood by an angle θ, and also an opening/closing cover 1 is closed. A cooling wind from the front of the vehicle is curvedly flowed by the plate surfaces of an underguard 50 and the opening/closing cover 1 to collide with the upper surface of the control plate 2. As result, a so-called air dam effect due to the control plate 2 is caused to generate force downwardly pushing the plate surface of a control plate 2. By this force, the front of this vehicle body is pushed to the ground to prevent the occurrence of the floating of the vehicle.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is applied to vehicles for leisure vehicles such as pajero and jeep (both are trade names) and vehicles for off-road vehicles, such as off-road vehicles. Regarding the structure of the underguard that is equipped.

[0002]

2. Description of the Related Art In an off-road vehicle, an underguard made of a plate material is provided below the vehicle body to protect the vehicle body from obstacles such as debris on the road.

That is, in FIG. 4 showing the front part of the automobile,
Reference numeral 100 is a vehicle body, 101 is an engine, and 102 is a transmission. The underguard 50 is provided at a front portion of the vehicle body 100 and below the engine 101 and the transmission 102. By this, body 100, engine
01 etc. are protected.

In an automobile equipped with such an underguard 50, an opening is provided at the front part of the underguard in order to prevent air in the engine room from staying and overheating in the engine room by installing this. It is provided and cooling air is introduced from here.

As a technique of this kind, there is a utility model 1-82925.
The device of the issue is provided. In this invention, an opening is provided in front of the underguard, and a lid plate for opening and closing the opening is provided, the lid plate is opened and closed by a vehicle speed sensor, and is closed when idling and opened when the vehicle is running. It is configured to control the opening.

[0006]

However, as seen in the invention of Japanese Utility Model Laid-Open No. 1-82925, the method of adjusting the opening of the opening of the underguard in the traveling state of the automobile is a mechanism for opening and closing the underguard. Since the control mechanism for controlling this is provided, the structure is complicated and the cost is high.

If the engine overheats when carrying up a mountain road or the like, the amount of cooling air may become insufficient in the above-mentioned opening area, and in such a case, the above technique cannot deal with it.
Also, if the opening of the underguard is opened only by the vehicle speed, the aerodynamic state deteriorates especially at high speeds, and the wind force of the cooling wind may cause the front of the vehicle body to float up due to the buoyancy action, impairing the running stability. There is also.

An object of the present invention is to prevent the deterioration of the running stability of the vehicle due to the flow of the cooling air from the underguard opening while maintaining a sufficient flow of the cooling air into the engine room, and to have a structure. An object is to provide a simple and low-cost underguard opening opening / closing mechanism.

[0009]

According to the present invention, an opening / closing cover for opening and closing the opening of the underguard and a control plate provided under the opening for controlling the flow of cooling air to the opening are provided together. The control plate is rotatable from the underguard surface toward the front side facing the cooling air by a predetermined angle.

In this case, it is preferable that the open / close cover and the control plate can be independently controlled to be opened / closed or rotated, and the control may be manual or automatic.
Preferably, the opening / closing cover and the control plate may be operated by a pull wire and a return spring.

[0011]

When the vehicle travels on a bad road surface such as off-road where there are many debris, the opening and closing cover closes the opening to protect the vehicle body, engine, etc. from debris.

If the opening / closing cover is opened when the vehicle is running, the amount of cooling air flowing from the opening to the engine room is increased and overheating of the engine room is prevented. If more cooling air is required when climbing a mountain road, etc., the control plate is rotated from the underguard surface toward the front side facing the cooling air by a predetermined angle, so that the control plate moves toward the opening. It functions as an introductory guide plate for letting in the cooling air, and the amount of cooling air can be further increased.

When the front part of the vehicle is about to float up at a high speed, the opening / closing cover is closed and the control plate is rotated forward by a predetermined angle with respect to the plate surface of the underguard, whereby the cooling air is generated. A force that collides with the upper part of the control plate and pushes the vehicle body downward through the control plate, a so-called air dam effect is generated, the body is prevented from being lifted up, and traveling stability of the vehicle is secured.

[0014]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing an embodiment of the present invention; However, the dimensions, materials, shapes, relative positions, etc., of the components described in this embodiment are not intended to limit the scope of the present invention thereto, unless there is a specific description, and are merely illustrative examples. Nothing more than.

1 to 3 are structural action diagrams showing an underguard opening portion of an automobile and its opening / closing mechanism according to an embodiment of the present invention, and FIG. 4 is a schematic layout diagram of a front portion of the automobile (in the vicinity of an engine room).

In FIG. 4, 100 is the body of the automobile, 10
Reference numeral 1 is an engine, 102 is a transmission, 103 is an engine room, and 50 is an underguard provided below the engine room 103.

The underguard 50 collides the earth and stones from the road surface with the earth and debris to repel the earth and body 10,
0, which protects the engine 101 and the like, and is publicly known. Reference numeral 51 denotes an opening portion that opens toward the front of the vehicle body 100 at the front portion of the underguard 50.

1 to 3 showing the vicinity of the opening 51, 1 is an opening / closing cover and 2 is a control plate. The opening / closing cover 1 is attached to a portion above the opening 51 of the underguard 50 so as to be rotatable around the support pin 7. The control plate 2 is formed in an L shape, and is attached to a lower portion of the opening 51 so as to be rotatable around the support pin 8.

A pull wire 5 is connected to a connecting portion 9 provided at a substantially central portion of the opening / closing cover 1, and a control plate 2 is also provided.
The pull wire 6 is also connected to the end connecting portion 10 of the.
The pull wires 5 and 6 are connected to a driver's cab (not shown),
It can be operated by the driver.

Reference numeral 3 denotes a return spring for the opening / closing cover 1, which is installed between the underguard 50 and the opening / closing cover 1 and biases the opening / closing cover 1 in the closing direction (Z direction in FIG. 1).

Reference numeral 4 is a return spring for the control plate 2, which is installed between the underguard 50 and the control plate 2.
The control plate 2 is urged in a direction in which it comes into contact with the plate surface of the underguard 50 (direction of arrow Y in FIG. 1).

In the automobile constructed as described above,
Engine room 1 as in early operation or when idling
When the temperature of 03 is low and when traveling on a road surface such as off-road where debris is scattered, both pull wires 5, 6
Relax.

As a result, as shown in FIG. 1, the opening / closing cover 1 closes the opening 51 by the elastic force of the return spring 3, and the control plate 2 is closed by the elastic force of the return spring 4 (the plate of the underguard 50). The state is substantially parallel to the surface).

Therefore, the opening 51 is closed by the opening / closing cover 1 to prevent dirt and stones from entering the vehicle body 100.
On the other hand, the control plate 2 is also closed and does not exhibit its function.

When there is little intrusion of debris or the like and the temperature of the engine room 103 is likely to rise, such as when traveling at high speed on a maintained road, the pull cylinder 5 for the opening / closing cover 1 is pulled from the cab.

As a result, as shown by the broken line in FIG. 1, the opening / closing cover 1 rotates around the support pin 7 to open the opening 51, and cooling air from the front of the vehicle passes through the opening 51 and the engine compartment 103. The engine room 103 is sent to the inside of the vehicle body 100, etc., and is kept at an appropriate temperature without overheating.

On the other hand, when the pull cylinder 6 for the control plate 2 is pulled, the control plate 2 is rotated around the support pin 8 as shown in FIG. 2, and its plate surface forms an angle θ with the under guard 50. It is pivotally fixed so that it stands slightly forward from the vertical position.

Therefore, when the control plate 2 is rotated to the above-mentioned position with the opening / closing cover 1 closed as shown in FIG. 2, the cooling air from the front of the vehicle becomes as shown by the arrow W in FIG. The plate surface of the under guard 50 and the plate surface of the opening / closing cover 1 cause the flow to bend and collide with the upper surface of the control plate 2.

As a result, the so-called air dam effect by the control plate 2 occurs, and a force F for pushing the plate surface of the control plate 12 downward is generated. This force F is a force that pushes the front part of the vehicle body 100 against the ground.

Therefore, when the vehicle is traveling with the opening 51 open by the opening / closing cover 1 as when traveling on a highway or the like, the vehicle body 100 is aerodynamically acted upon by the cooling air flowing into the vehicle body at a high speed. When the front part of the vehicle is about to rise, as shown in FIG. 2, when the control plate 2 is set up at an angle θ and the opening / closing cover 1 is closed, the force F acts and the front part of the vehicle body 100 is grounded. It prevents the vehicle from floating up.

When a large amount of cooling air is required when carrying a mountain road or the like, as shown in FIG. 3, the pull cylinder 5 for the opening / closing cover 1 is pulled from the cab to open the opening / closing cover 1
Is rotated around the support pin 7 to open the opening 51, and the pull cylinder 6 for the control plate 2 is pulled to rotate the control plate forward, whereby the control plate 2 is opened. It functions as an introduction guide plate for letting the cooling air into the chamber, and the amount of cooling air can be further increased.

[0032]

According to the present invention, since the opening / closing cover for the opening provided in front of the under guard can increase the amount of cooling air by the control plate provided under the opening, It is possible to adjust the cooling air in two stages depending on the condition of the traveling road surface and the traveling speed of the vehicle without having the function of adjusting the opening of the guard opening, and it is possible to supply the required amount of cooling air to the engine room according to the traveling condition. .

Further, when an attempt is made to raise the front part of the vehicle due to the conduction of the opening cooling air that is fully opened during high-speed traveling, the control plate is set up against the plate surface of the underguard and the opening / closing cover is closed. As a result, it is possible to prevent the downward force due to the air dam effect from causing the front portion of the vehicle to rise.

As a result, the required amount of cooling air can be supplied to the engine room of the vehicle in a timely manner, overheating of the engine room can be prevented, and the traveling stability of the vehicle can be maintained well due to the air dam effect by the control plate during high-speed traveling. can do.

Further, the above effect can be obtained by a very simple and low-cost device in which a pull wire and a return spring operated from the driver's cab are provided on the opening / closing cover and the control plate.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a main part showing a structure of an underguard opening portion of an automobile according to an embodiment of the present invention, in which a broken line shows a normal cooling air introduction state.

FIG. 2 is a cross-sectional view showing the operation of the above embodiment, showing a state in which an air dam effect is produced.

FIG. 3 is a cross-sectional view showing the operation of the above embodiment, showing a state in which a cooling air increasing effect is brought about.

FIG. 4 is an external view of a front part of an automobile.

[Explanation of symbols]

 1 Open / close cover 2 Control plate 3, 4 Return spring 5, 6 Pull wire 50 Under guard 51 Opening 100 Body 101 Engine 103 Engine room

Claims (3)

[Claims] 1. A vehicle in which an underguard for protecting the vehicle body from debris or the like is provided in a lower portion of a vehicle body, and an opening / closing cover for opening and closing a cooling air introduction opening provided in the underguard, and a lower portion of the opening portion. A vehicle provided with a control plate provided to control the flow of cooling air to the opening, and the control plate is rotatable from the underguard surface toward the front side facing the cooling air by a predetermined angle. Under guard structure. 2. The underguard structure for a vehicle according to claim 1, wherein the opening / closing cover and the control plate are independently controllable for opening / closing or rotation. 3. The underguard structure for a vehicle according to claim 1, wherein the opening / closing cover and the control plate are configured to be operated by a pull wire and a return spring.