JP3251891B2 - Automotive defroster duct structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a windshield provided on a vehicle body and a heater unit for blowing air onto the inner surfaces of the respective side glasses so as to prevent the inner surfaces of the respective windshields from being fogged by water vapor. The present invention relates to an automobile defroster duct structure for guiding.

[0002]

2. Description of the Related Art A conventional defroster duct structure for an air conditioner mounted on an automobile is disclosed in Japanese Patent Application Laid-Open No. 4-92717.

According to this, a main duct extending upward from the heater unit side is provided at the front end of the vehicle compartment, and the extending end side of the main duct extends in the vehicle width direction as it goes upward. Is formed, and a blowing nozzle whose upper end opens toward the front window glass is formed. Further, a side duct is provided, one end of which is coupled to a part of the side of the main duct in the vehicle width direction, and the other end of which extends toward the side window glass. When air is discharged from the heater unit by the driving of the heater unit, the air is blown out through the main duct toward the front window glass, and passes through the side duct toward the side window glass. The inner surfaces, which are the surfaces of the respective glasses on the side of the passenger compartment, are prevented from fogging.

[0004] Further, at the connecting portion between the above-mentioned part of the main duct and one end of the side duct, the upper part is projected more inward in the main duct in the vehicle width direction than the lower part. The lower surface of the protrusion serves as a guide surface for guiding air from the heater unit side of the main duct to one end of the side duct.

Therefore, part of the air flowing upward from the heater unit side in the main duct is guided by the guide surface and supplied to one end of the side duct. Thus, the amount of air blown toward the side window glass through the side window glass is sufficiently ensured, and thus the side window glass is also sufficiently prevented from fogging.

[0006]

By the way, in the above-mentioned prior art, in order to guide a sufficient amount of air into the side duct, the projecting portion projects largely from the side of the main duct to the inside. Therefore, of the air flowing upward along the vicinity of the inner surface of the side portion of the main duct from the heater unit side, the air heading toward the blowing nozzle side is
The whole flows so as to detour around the projecting portion and bend greatly.

However, when the air flows along the upper surface of the protrusion after the air is largely curved as described above, many vortices are likely to be generated near the upper surface of the protrusion.
The flow of the air easily separates greatly from the upper surface of the protruding portion and the inner surface of the side of the blowing nozzle connected thereto.

Therefore, among the air blown from the blow nozzle toward the windshield, the amount of air blown from the side of the blow nozzle tends to be insufficient. There is a possibility that the fogging prevention on the side portions may be insufficient, and so-called unclear weather may occur.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and has been made to sufficiently prevent fogging of the front window glass and the side window glass, and to prevent fogging of each part of the front window glass. It is an object to make the stop more uniform.

[0010]

According to the present invention, there is provided a defroster duct structure for a vehicle, comprising: a main duct extending upward from a side of a heater unit;
2 is formed at the extension end side of the main duct 22 to form a blowing nozzle 23 whose size in the vehicle width direction increases upward and whose upper end opens toward the front window glass 10. Is the main duct 2
2. In a vehicle defroster duct structure provided with a side duct 28 which is connected to a part 30a of a side portion 30 in the vehicle width direction 2 and the other end portion 31 extends toward the side window glass 12,

The other portion 30b of the side portion 30 of the main duct 22 adjacent to the upper side of the portion 30a is larger than the inner width W of the portion 30a in the front-rear direction of the side portion 30 of the main duct 22. In order to shorten the width dimension w,
A step portion 33 is formed on a front wall and / or a rear wall of a portion extending from a portion 30a to another portion 30b of the main duct 22, and a lower surface of the step portion 33 is placed on the main duct 22 from the heater unit 18 side. A guide surface 34 for guiding the air 19 (C) toward one end 29 of the side duct 28 is provided.

[0012]

Embodiments of the present invention will be described below with reference to the drawings.

In FIGS. 2 and 3, reference numeral 1 denotes an automobile body, and an arrow Fr indicates a front side thereof. The left and right described below refer to the vehicle width direction toward the front (the direction toward FIG. 2).

The interior of the vehicle body 1 is a vehicle compartment 2, and a front cowl 3 constituting the vehicle body 1 extends at the front end of the vehicle compartment 2 in the vehicle width direction. Further, there is provided an instrument panel 4 extending in the vehicle width direction along the front cowl 3 and entirely covering the front cowl 3 from the vehicle compartment 2 side. The instrument panel 4 has a plurality of instrument panels in the vehicle width direction. The front cowl 3 is fastened to the vehicle body 1 by fasteners 5.

A front window 9 is provided above the front cowl 3 with a vehicle center 8 in the vehicle width direction as a center in the vehicle width direction. The front window 9 has a front window glass 10. Side doors 11 are respectively provided on the left and right sides of the vehicle body 1 so as to be connected to the rear of the left and right side ends of the front window 9.
The side door 11 has a side window glass 12 on an upper part thereof.

An air conditioner 14 mounted on an automobile is provided at a front portion of the cabin 2. Hereinafter, the air conditioner 14 will be described.

On the upper surface of the instrument panel 4, central outlets 15 are formed near the left and right sides of the vehicle body center 8, respectively, and these central outlets 1 are formed.
5 is open toward the lower inner surface of the front window glass 10. In addition, the instrument panel 4
Side outlets 16 are formed on each of the left and right sides of the upper surface of the window glass. Each of the side outlets 16 opens toward the lower inner surface of each of the side window glasses 12.

A heater unit 18 provided with a fan and the like is provided below the front cowl 3. Further, a resin defroster duct 21 for guiding the air 19 discharged from the heater unit 18 to each of the central outlets 15 and the side outlets 16 is provided, and the defroster duct 21 is provided on the instrument panel. 4 is housed inside.

The defroster duct 21 has a main duct 22 extending vertically. One end (lower end) of the main duct 22 communicates with the discharge port of the heater unit 18, and the other end (upper end) extends upward from the heater unit 18 side and has an extended end. The side is bifurcated to the left and right.

Each of the left and right branch portions on the extension end side of the main duct 22 has an inner width dimension in the vehicle width direction as it goes upward, and an inner width dimension in the front-rear direction decreases (front view). And a fan-shaped blowing nozzle 23. The upper end of each of the blowing nozzles 23 is fastened to the instrument panel 4 by a fastener 24, and the opening of the upper end of each of the blowing nozzles 23 is connected to the central outlet 15
The opening is opened toward the lower inner surface of the front window glass 10.

In particular, as shown in FIG. 3, the main duct 22 including the nozzle lower portion 23a of each of the blow-out nozzles 23
Has a substantially large cross section in plan view and has a large capacity. On the other hand, the nozzle upper portion 23b of the blowing nozzle 23 is bent upward and rearward from the upper end of each of the nozzle lower portions 23a and linearly extends rearward and upward along the inner surface of the front window glass 10 in a side view, In addition, the cross-sectional area of each part in a plan view is reduced.

A space 25 is provided between the left and right blow nozzles 23 in the vehicle width direction. This space 2
Reference numeral 5 denotes an arrangement space for the fastener 5 for fastening the central portion of the instrument panel 4 in the vehicle width direction to the front cowl 3 by the fastener 5.

The defroster duct 21 has a pair of left and right side ducts 28,28. Each of these side ducts 28 extends in the vehicle width direction, and one end portion 29 of the vehicle body center 8 side is connected to a vertical portion 30 a of a side portion 30 of the main duct 22 in the vehicle width direction. I have. The other end portions 31 of the side ducts 28, which are the outer portions in the vehicle width direction, extend toward the corresponding side window glass 12, and the extended ends thereof are connected to the instrument panel 4. The opening of the other end 31 of the side duct 28 is opened toward the lower inner surface of the side window glass 12 through each side outlet 16.

In the above case, the main duct 22 and the side ducts 28 are substantially symmetrical with respect to the center 8 of the vehicle body, so that the right side of the center 8 of the vehicle body will be described. The description of the left-hand part is omitted.

In all the drawings, the inner width W of the one end 29 of the side duct 28 and the portion 30a of the main duct 22 are substantially the same in the front-rear direction. In addition, the inner width dimension w of the other portion 30b of the side portion 30 of the main duct 22 adjacent above the portion 30a is shorter than the inner width dimension W of the portion 30a.

In order to change the inner widths W and w as described above, a part 30 of the main duct 22 is used.
Steps 33 are formed by bending each of the front wall and the rear wall in the portion extending from “a” to the other portion 30 b, and the lower surface of each step 33 serves as a guide surface 34. Each of the guide surfaces 34 has a triangular shape in which the width dimension gradually increases toward the outside in the vehicle width direction in plan view, and extends substantially horizontally and flatly. The guide surface 34 guides the air 19 from the heater unit 18 side of the main duct 22 to one end 29 of the side duct 28.

In the above structure, when the heater unit 18 is driven, the air 19 outside the vehicle and / or
Is heated by being sucked into the heater unit 18 and discharged from the heater unit 18.

Of the air 19 (A) discharged from the heater unit 18 and flowing upward from the heater unit 18 side in the main duct 22, a part of the air 19 (B) is , And is blown out toward the inner surface of the front window glass 10, and the air 19 (B) prevents the front window glass 10 from fogging. In this case, as described above, the lower portion of the main duct 22 including the nozzle lower portion 23a has a large capacity and is a so-called "static pressure chamber". Therefore, the air 19 (B) is temporarily discharged from the "static pressure chamber". And is directed to the front window glass 10 through the nozzle upper portion 23b having a reduced area. Accordingly, the air 19 (B) is quickly and rapidly directed toward the windshield 10, so that the fogging is effectively prevented.

The air 1 flowing upward from the side of the heater unit 18 in the main duct 22 flows upward.
9 (A), part of the air 19 (C) is supplied to the guide surface 3
4 and is supplied into the one end 29 of the side duct 28, the amount of air 19 (D) blown out toward the inner surface of the side window glass 12 through the side duct 28 is sufficient. Is secured. Therefore, the side window glass 1 passes through the side duct 28.
A sufficient amount of air 19 (D) blown toward 2 also sufficiently prevents fogging of the side window glass 12.

In the above case, the step portion 33 having the guide surface 34 is connected to the side portion 3 of the main duct 22 as described above.
0 of the air 19 (A) flowing upward from the heater unit 18 side along the vicinity of the inner surface of the side portion 30 of the main duct 22 because the air 19 (A) is formed on the front wall and the rear wall. Air 19 directed to the blowing nozzle 23 side
(B) ′ shows the side 3 of the main duct 22 as in the prior art.
The projecting portion projecting inward from zero prevents the entirety from being largely curved once inward of the main duct 22.

For this reason, as described above, the “static pressure chamber” allows the air 19 flowing through the blowing nozzle 23 to flow.
The speed of (B) is high and the side 30
Near the inner surface of the main duct 22, near the inner surface of the side portion 30 of the main duct 22 on the downstream side of the step 33 by preventing the large curved flow as described above. The generation of the vortex 36 is suppressed, so that the air 19 flows from the inner surface of the side portion 30 of the blowing nozzle 23 connected to the downstream side of the step portion 33.
(B) ′ is prevented from being largely separated, and turbulence is also suppressed, so that the air flows upward along the side portion 30 of the blowing nozzle 23.

Therefore, by preventing the above-mentioned peeling, the air 19 blown out from the side portion 30 of the blow-out nozzle 23 is formed.
(B) 'is sufficiently ensured and the turbulence is suppressed as described above, so that the blown air 1
9 (B) 'reaches farther, so that the fogging on the side of the windshield 10 is sufficiently prevented.

That is, as described above, the front window glass 10 and the side window glass 12 are sufficiently prevented from fogging, and the front window glass 10 is also more uniformly prevented from fogging.

Further, as described above, the step portion 33 is formed substantially symmetrically in the front and rear sides of the front wall and the rear wall of the main duct 22, and is formed large on one of the walls. Therefore, since the area of each guide surface 34 is reduced, the generation of the vortex 36 is more reliably suppressed. As a result, the turbulent flow is more reliably prevented, and the turbulent flow is more reliably suppressed.

Therefore, the amount of the air 19 (B) 'blown out from the side portion 30 of the blow-out nozzle 23 is more sufficiently secured, and the blown air 19 (B)' reaches farther. Become.

Although the above description is based on the illustrated example, the step 33 may be provided on only one of the front wall and the rear wall of the main duct 22. Further, in the present embodiment, the guide surface 34 is a triangular flat surface in a plan view, but may be a quadrangular shape, and may have a circular arc concave surface to provide a function of guiding the air 19 (C). You may make it raise more. Further, if the area of the guide surface 34 is changed, the supply amount of the air 19 (C) to the side duct 28 can be easily adjusted.

[0037]

According to the present invention, a main duct extending upward from the heater unit side is provided, and the dimension in the vehicle width direction increases toward the upper end on the extension end side of the main duct. The upper end forms a blow-out nozzle that opens toward the front window glass, one end is connected to a part of the main duct in a side portion in the vehicle width direction, and the other end extends toward the side window glass. In a car defroster duct structure with side ducts,

The inner width of the other part of the side of the main duct adjacent to the upper part of the part is shorter than the inner width of the part of the main duct in the front-rear direction at the side of the main duct. A step is formed on a front wall and / or a rear wall of a part from a part of the main duct to another part, and a lower surface of the step is directed from the heater unit side of the main duct to one end of the side duct. As a guide surface for guiding air.

For this reason, of the air discharged from the heater unit and flowing upward from the heater unit side in the main duct, a part of the air passes through the main duct and is deposited on the inner surface of the front window glass. The wind blows out, and the air prevents fogging of the windshield.

Further, of the air flowing upward from the heater unit side in the main duct, part of the air is guided by the guide surface and supplied to one end of the side duct. The amount of air blown toward the inner surface of the side window glass through the side duct is sufficiently ensured. Therefore, a sufficient amount of air blown toward the side window glass through the side duct also sufficiently prevents the side window glass from fogging.

Further, since the stepped portion having a guide surface for guiding air into the side duct is formed on the front wall and / or the rear wall of the side of the main duct as described above, the stepped portion is formed from the side of the heater unit. Of the air flowing upward along the inner surface near the side of the main duct,
The air directed to the blow-out nozzle side is, as in the prior art, once bent largely toward the inside of the main duct by a protrusion protruding inward from the side of the main duct, That is prevented.

For this reason, the generation of a vortex near the inner surface of the side of the main duct at the downstream side of the step portion is suppressed, whereby the blowing nozzle connected to the downstream side of the step portion at the downstream side of the step portion is suppressed. Large separation of air from the inner surface of the side portion is prevented, and turbulence is suppressed, so that the air flows upward along the side portion of the blowing nozzle.

Therefore, by preventing the above-mentioned separation, a sufficient amount of air blown out from the side of the blow-out nozzle is ensured, and the turbulence is suppressed as described above. The air will travel farther and the fogging on the sides of the windshield will be sufficient.

That is, as described above, the fogging of the front window glass and the side window glass is sufficiently prevented, and the fogging of each portion of the front window glass is also more uniformly prevented.

[Brief description of the drawings]

FIG. 1 is a perspective partial sectional view of a defroster duct.

FIG. 2 is an overall rear view of the defroster duct as viewed from the passenger compartment side.

FIG. 3 is a sectional view taken along line 3-3 of FIG. 2;

FIG. 4 is a partially enlarged partial sectional view of FIG. 2;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Body 2 Cabin 4 Instrument panel 8 Body center 10 Front window glass 12 Side window glass 14 Air conditioner 18 Heater unit 19 Air 21 Defroster duct 22 Main duct 23 Blow nozzle 28 Side duct 29 One end 30 Side 30a One Part 30b Other part 31 The other end 33 Step part 34 Guide surface 36 Vortex W, w Inner width dimension

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁷ , DB name) B60H 1/34 B60S 1/54 B60S 1/56

Claims (1)

(57) [Claims] 1. A main duct extending upward from a heater unit side is provided, and a dimension in a vehicle width direction is increased toward an upper end on an extending end side of the main duct, and an upper end thereof is a front window glass. An automobile having a blowing nozzle that opens toward the vehicle, one end of which is connected to a part of the main duct in a side portion in the vehicle width direction, and the other end of which is provided with a side duct extending toward the side window glass. In the defroster duct structure for use, the inner width dimension of the other portion on the side of the main duct adjacent to the upper part of the part is shorter than the inner width dimension of the part on the side of the main duct in the front-rear direction. Like
A step is formed on a front wall and / or a rear wall of a part extending from a part of the main duct to another part, and a lower surface of the step is connected to one end of the side duct from the heater unit side of the main duct. A defroster duct structure for automobiles that serves as a guide surface for guiding air toward the vehicle.