JPH0426308Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) The present invention relates to the lower body structure of a vehicle, and in particular,
This relates to the structure of a floor panel that is compatible with the air duct of an air conditioner.

(Prior Art) In general, the floor panel of a passenger car, etc. has a propeller shaft tunnel formed in the center that protrudes in the longitudinal direction of the vehicle body, and is reinforced by cross members extending in the vehicle width direction being joined at appropriate intervals on the upper surface. etc., and the top surface is covered with floor mats. On the other hand, various types of vehicles are equipped with an air conditioner, and the main unit of the air conditioner is housed in the instrument panel, and fresh air from outside the vehicle is regulated in temperature and sent into the vehicle interior. The fresh air is blown out from the front of the instrument panel etc. to the front seat passengers.
Air is blown out to rear seat passengers through an air duct.

The arrangement structure of the air duct was conventionally developed in 1980.
As disclosed in Publication No. 57419, it is laid on the floor panel from the main unit, and after descending along the side of the tunnel part of the floor panel,
It extends rearward on the flat surface of the floor panel. The air duct passes through the cross member in the middle of its extension, and blows fresh air into the vehicle from the opening at the rear end.

(Problem to be solved by the invention) As mentioned above, in the lower car body structure where the air duct is installed, the air duct is also covered with a floor mat installed in the floor panel, but the rear end opening is for blowing out air. It must be located above the floor mats. Therefore, the first half of the air duct before penetrating the cross member is covered with a floor mat, while the rear end after penetrating the cross member is brought out above the floor mat. Therefore, if the air duct is formed straight along the flat surface of the floor panel, the rear end cannot extend above the floor mat, so it is bent into a hook shape at the inside of the cross member, and the rear end on the opening side is raised. ing.

However, since the air duct is bent, the ventilation resistance increases, the amount of air blown out decreases, and heating and cooling efficiency deteriorates. In addition, in the assembly work, a bent air duct must be inserted into the cross member, and
There was a problem in that it was necessary to position the bent part within the cross member, which required time and effort and resulted in poor work efficiency.

In view of this, the present invention reverses the conventional relationship between the air duct and the floor panel and bends the floor panel to form a straight air duct, reducing ventilation resistance and improving work efficiency. The purpose is to

(Means for Solving the Problems) In order to achieve the above-mentioned object, the means taken by the present invention are as follows: First, a section of the floor panel forming the lower surface of the passenger compartment has a substantially U-shaped cross section extending in the vehicle width direction. A shaped cross member is joined. An air duct extending in the longitudinal direction of the vehicle body is disposed to pass through the closed cross section formed by the floor panel and the cross member. Further, the air duct is formed substantially straight from the front to the rear of the cross member, and an air blowing opening is formed at the rear of the cross member so as to protrude toward the vehicle interior from a floor mat covering the floor panel. ing. In addition, on the opening side of the air duct in the floor panel,
The stepped portion is lowered at a position corresponding to the cross member and is wider than the air duct and extends rearward from the air duct.

(Function) With the above configuration, in the present invention, the floor panel is bent so that it is wider than the air duct and is lowered to the rear of the air duct, so the air duct is passed straight through the cross member and the opening is connected to the floor mat. This can reduce ventilation resistance and improve assembly workability.

(Example) Hereinafter, an example of the present invention will be described in detail based on the drawings.

As shown in FIGS. 1 to 3, reference numeral 1 denotes a floor panel of various vehicles such as passenger cars, which constitutes the lower surface of the passenger compartment. A tunnel portion 2 of a propeller shaft extending in the longitudinal direction of the vehicle body is formed in the center of the floor panel 1 by being bent into a substantially inverted U-shape in cross section, and flat portions 3 are formed on both sides of the tunnel portion 2. A plurality of cross members 4 (only one is shown in the drawing) are provided at predetermined intervals on the interior surface of the flat portion 3, extending in the vehicle width direction. The cross member 4 is formed into a hat shape with a substantially U-shaped cross section and flanges 4a, 4a at both lower ends.
The flange 4a is joined to the flat surface 3 of the floor panel 1 to form a closed cross section A, while the side end surface is joined to the side surface of the tunnel portion 2 to reinforce the floor panel 1. Further, side frames 5 extending in the longitudinal direction of the vehicle body are provided on the lower surfaces of both sides of the floor panel 1, and the side frames 5 are formed in an inverted hat shape in cross section with flanges 5a, 5a at the upper ends of both sides. It is joined to the floor panel 1 at.

Further, the floor panel 1 is provided with an air duct 6 for feeding air for heating and cooling into the rear part of the vehicle interior. Although not shown, the front end of the air duct 6 is connected to the main unit of the air conditioner housed in the instrument panel, and the tunnel section 2 of the floor panel 1 is connected to the main unit of the air conditioner housed in the instrument panel.
After falling, it branches into two parts, left and right. Then, the air duct 6 descends from the upper surface of the tunnel portion 2 down the side surface of the tunnel portion 2 via the first bending portion 6a, and then passes over the flat surface 3 of the floor panel 1 via the second bending portion 6b to the rear of the vehicle body. A rear extension portion 6c is formed by extending toward the rearward extension portion 6c. The rear extension part 6
c is formed straight with a rectangular cross section, and passes through communication holes 4b, 4b bored at the same height on the front and rear surfaces of the cross member 4, and within the closed cross section A between the cross member 4 and the floor panel 1. It penetrates through and protrudes to the rear of the cross member 4. That is, the rear extension portion 6c is arranged straight from the front to the rear of the cross member 4, and an air blowing opening 6d is provided at the rear end of the cross member 4.

On the other hand, a front stepped portion 7 and a side stepped portion 8 are formed in the flat portion 3 of the floor panel 1 at positions corresponding to the cross member 4 and the side frame 5, and a stepped portion is formed on the opening 6d side of the air duct 6. A step-down flat portion 3a is formed. The front stepped portion 7 is formed between the tunnel portion 2 and the side frame 5, and extends from the inclined surface 7b via the front fold line 7a.
is formed by a bend, and is inclined slightly downward toward the rear of the inclined surface 7b, bent at the rear bending line 7c, and connected to the step-down flat portion 3a. The front fold line 7a is located slightly behind the front flange 4a of the cross member 4, and the rear fold line 7c is located approximately at the joint of the rear flange portion 4a, and the inclined surface 7b
is formed substantially within the cross member 4. Further, the side step portion 8 is formed at the rear of the front step portion 7, and an inclined surface 8b is bent through the outer fold line 8a, and the inclined surface 8b is inclined slightly downward as it goes inward. However, it is bent at the inner bending line 8c and connected to the step-down flat portion 3a. The outer fold line 8a and the inner fold line 8c are located between the joints of the flanges 5a, 5a in the side frame 5, respectively, and an inclined surface 8b is formed in the side frame 5. Then, the outer bent line 8a
is continuous to the front fold line 7a of the front step part 7, the inner fold line 8c is continuous to the rear fold line 7c, and the inclined surface 8b is continuous to the inclined plane 7b of the front step part 7.
Continuous through. Therefore, the step-down flat part 3a is slightly depressed by both the stepped parts 7 and 8, and is formed to be wider than the air duct 6 and extend to the rear of the air duct 6.
In the rear extension part 6c, the front half up to the cross member 4 is arranged close to the flat part 3 of the floor panel 1, while the rear end part protruding from the cross member 4 is spaced apart from the step-down flat part 3a by a predetermined distance. It will be placed above.

Further, the floor panel 1 is connected to a floor mat 10.
Although the floor mat 10 is laid so as to cover the air duct 6, there is a gap between the lowered flat part 3a and the air duct 6, so the air duct 6
The blowing opening 6d projects upward from the floor mat 10.

Therefore, the cooling and heating air passes through the air duct 6 from the main unit of the air conditioner stationer and is blown out to the rear of the vehicle interior through the blowout opening 6d. At this time, since the rear extension part 6c of the air duct 6 is formed straight through the closed section A between the cross member 4 and the floor panel 1, ventilation resistance is small and air can be blown out efficiently. Become.

Further, the illustrated cross member 4 may also serve as a support member for the rear seat, in which case the rear end portion of the air duct 6 that protrudes from the floor mat 10 will be hidden by the rear seat. Furthermore, although the step-down flat portion 3a is formed by bending the floor panel 1, each step portion 7, 8 is formed by the joint portion of the cross member 4 and the side frame 5, so that the floor panel 1 is bent. The strength will be sufficiently ensured.

(Effect of the invention) As described above, according to the vehicle lower body structure of the invention, the opening side of the air duct in the floor panel is lowered at a position corresponding to the cross member, and the lowered part is wider than the air duct. Since it is formed behind the air duct, the air duct can be formed straight and pass through the closed cross section of the cross member and floor panel, and the blowout opening can be made to protrude above the floor mat. Therefore, the ventilation resistance can be significantly reduced compared to the conventional case where the air duct is bent, so that air can be efficiently supplied into the vehicle interior.

In addition, during assembly work such as installing air ducts, since the air ducts are formed straight,
Penetration into the cross member can be made extremely easy, and work efficiency can be improved.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention, FIG. 1 is a schematic perspective view showing the lower vehicle body structure, and FIG. 2 is a schematic perspective view showing the lower vehicle body structure.
FIG. 3 is a cross-sectional view taken along line 1--FIG. 1... Floor panel, 3... Flat part, 3a...
Lowered flat part, 4... Cross member, 5... Side frame, 6... Air duct, 6c... Rear extension part, 6d... Opening, 7, 8... Step part, 10...
...Floor mat, A...Closed section.

Claims (1)

[Scope of utility model registration request] A cross member having a substantially U-shaped cross section extending in the vehicle width direction is joined to the vehicle interior surface of a floor panel forming the lower surface of the vehicle interior, and extends in the vehicle body longitudinal direction within a closed cross section formed by the floor panel and the cross member. An air duct is disposed through the air duct, and the air duct is
The cross member is formed substantially straight from the front to the rear, and an air blowing opening is formed at the rear of the cross member to protrude toward the vehicle interior from a floor mat covering the floor panel. A lower vehicle body structure for a vehicle, characterized in that, on the opening side of the air duct, a lowered part is formed at a position corresponding to the cross member and is wider than the air duct and extends rearward from the air duct.