JPH11129742A - Defroster duct structure for automobile - Google Patents

Abstract

PROBLEM TO BE SOLVED: To sufficiently defrost a windshield glass and a side window glass, and to defrost each part of the windshield glass in a more uniform manner. SOLUTION: An air supply nozzle 23 to be opened toward a windshield glass is formed on an extension end side of a main duct 22 extended from a heater unit side. A side duct 28 one end part 29 of which is connected to a side part 30 of the main duct 22 and the other end part of which is extended toward a side window glass, is provided. An upper part 32a of a connection part 32 of the side part 30 of the main duct 22 to one end part 29 of the side duct 28 is projected inward of the main duct 22 relative to its lower part 32b. A communication passage 35 to communicate a space in the main duct 22 on the lower side of the upper part 32a of the connection part 32 with a space in the main duct 22 on the upper side, is formed on the upper part 32a of the connection part 32.

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 connected to a 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 joint between the side portion of the main duct and one end portion of the side duct, the upper portion is protruded more inward in the main duct in the vehicle width direction than the lower portion. 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 is connected to the side portion 30 in the vehicle width direction and the other end portion 31 extends toward the side window glass 12.
8, the upper portion 32 a of the connecting portion 32 between the side portion 30 of the main duct 22 and the one end portion 29 of the side duct 28 is positioned inside the main duct 22 in the vehicle width direction more than the lower portion 32 b of the connecting portion 32. In the automotive defroster duct structure protruding toward

The space in the main duct 22 on the lower side from the upper portion 32a of the connecting portion 32 is divided into the main duct 22 on the upper side.
A communication passage 35 communicating with the inner space is formed in the upper portion 32 a of the coupling portion 32.

[0012]

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

(First Embodiment)

FIGS. 1 to 4 show a first embodiment.

In FIGS. 2 and 3, reference numeral 1 denotes an automobile body, and an arrow Fr indicates the front 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 interior 2, and a front cowl 3 constituting the vehicle body 1 extends at the front end of the vehicle interior 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 the vehicle body 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 respectively formed near the left and right sides of the vehicle body center 8, 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 outlet 15 and the side outlet 16 is provided. 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 long in the vehicle width direction, and one end portion 29 on the vehicle body center 8 side is joined to a part of the side portion 30 of the main duct 22 in the vehicle width direction in the vertical direction. . 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. The description of the left-hand part is omitted.

Referring to FIGS.
The upper portion 32a of the connecting portion 32 between the side portion 30 of the main duct 22 and the one end portion 29 of the side duct 28 is protruded more inward of the side portion 30 of the main duct 22 in the vehicle width direction than the lower portion 32b. Department. The lower surface of the upper portion 32a of the connecting portion 32 serves as a guide surface 33 that guides the air 19 from the heater unit 18 side of the main duct 22 to one end portion 29 of the side duct 28.

A middle part (almost the center part) in the front-rear direction, which is a part of the upper part 32a of the coupling part 32, is bulged outwardly of the defroster duct 21, whereby
The side portion 30 of the blowing nozzle 23 in the upper portion 32a
And a swelling portion 34 is integrally formed so as to straddle the end portion 29 of the side duct 28, and the inside of the swelling portion 34 is a communication passage 35 extending in the vertical direction. This bulge 34
Is formed in a notch shape at the protruding end of the upper portion 32a toward the main duct 22, and the upper portion 3 of the coupling portion 32 is formed.
The space in the main duct 22 on the lower side from 2a communicates with the space in the main duct 22 on the upper side. In addition,
The bulging portion 34 is provided on the side portion 30 of the blowing nozzle 23.
And one end 29 of the side duct 28 as a connecting piece, whereby the defroster duct 21 is reinforced.

In the above configuration, when the heater unit 18 is driven, the air 19 outside the vehicle and / or in the cabin 2 is driven.
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. Therefore, the air 19 (B) is rapidly and rapidly directed to the front window glass 10, so that the fogging is effectively prevented.

The air 1 flowing upward from the heater unit 18 side of the main duct 22
9 (A), part of the air 19 (C) is
Since the air 19 is guided by the guide surface 33 on the lower surface of 2a and is supplied into the one end 29 of the side duct 28, the air 19 (blows out) through the side duct 28 toward the inner surface of the side window glass 12 ( The amount of D) is sufficiently secured. Therefore, a sufficient amount of air 19 (D) blown toward the side window glass 12 through the side duct 28 causes the side window glass 1
The anti-fog of 2 is also made sufficiently.

In the above case, the upper part 32a of the connecting part 32 is
As described above, since the protruding portion is formed by protruding inward from the side portion 30 of the main duct 22, it extends upward from the heater unit 18 side along the vicinity of the inner surface of the side portion 30 of the main duct 22. Of the flowing air 19 (A), air 19 (B) 'directed toward the blowing nozzle 23 side.
Part of the air 19 (B) 'is once bent greatly toward the inside of the main duct 22, but the other part of the air 19 (B)' is largely bent as described above by passing through the communication passage 35. Flowing is prevented.

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
In the vicinity of the inner surface, the vortex tends to be easily generated, but the whole of the air 19 (B) 'toward the blow-out nozzle 23 is greatly curved, and the air 19 (B)' is downstream of the upper portion 32a of the coupling portion 32.
The generation of the vortex is suppressed as compared with the related art in which the vortex 36 is likely to be generated in the vicinity of the inner surface of the side portion 30 of the main duct 22, whereby the side portion 30 of the blowing nozzle 23 connected to the downstream side of the upper portion 32 a is formed. Air 19 (B) 'from inside
Is prevented from being largely separated, and turbulence is suppressed, so that the air is caused to flow upward along the side portion 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 communication passage 35 is formed substantially at the center in the front-rear direction of the upper portion 32a of the coupling portion 32. Therefore, the communication passage 35 extends from the heater unit 18 side to the side portion of the main duct 22. The main flow of the air 19 (A) flowing in a substantially central portion of the communication passage 30 in the front-rear direction is
To the upper end side of the blowing nozzle 23, the separation of the air 19 (B) 'is more reliably prevented as described above, and the turbulence is more reliably suppressed. Will be made to do.

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

The provision of the communication passage 35 reduces the area of the guide surface 33 and reduces the area of the main duct 2.
If the amount of the air 19 (C) guided from the inside to the one end portion 29 of the side duct 28 becomes too small, the projecting amount of the upper portion 32 a of the connecting portion 32 is increased, and the communication passage 35 is cut off. If the area is slightly increased,
May be slightly increased in the vehicle width direction.

Further, the communication passage 35 may be formed in the upper portion 32a of the connecting portion 32 so as to be deviated in one direction in the front-rear direction.

(Second Embodiment)

FIG. 5 shows a second embodiment.

According to this, instead of the bulging portion 34 in the first embodiment, the side portion 30 of the blowing nozzle 23 in the upper portion 32a of the connecting portion 32 and the side duct 2
A pipe 38 is integrally formed so as to straddle one end 29 of the pipe 8, and the inside of the pipe 38 is a communication passage 35.

Other structures and operations are the same as those of the above-described embodiment, and the description thereof will be omitted.

[0044]

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 nozzle that opens toward the front window glass, and one end is connected to the side of the main duct in the vehicle width direction and the other end extends toward the side window glass. A defroster duct structure for an automobile, wherein an upper portion of a connection portion between a side portion of the main duct and one end portion of the side duct is protruded inward of the main duct in a vehicle width direction from a lower portion of the connection portion. ,

A communication path is formed in the upper part of the connection part for connecting the space in the main duct on the lower side from the upper part of the connection part with the space in the main duct on the upper side.

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 to the inner surface of the front window glass. The wind blows out, and the air prevents fogging of the windshield.

A part of the air flowing upward from the heater unit side of the main duct is guided to the lower surface of the upper portion of the largely protruding connecting portion, and one end of the side duct is guided to one end of the side duct. Since the air is supplied to the inside, 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.

In the above case, since the upper portion of the connecting portion is protruded inward from the side of the main duct as described above, the inner surface of the side of the main duct from the heater unit side is formed. Of the air flowing upward along the vicinity, a part of the air flowing toward the blow-out nozzle side is once greatly curved toward the inside of the main duct, but the other part of the air is By passing through the communication path, it is possible to prevent a large curved flow as described above.

For this reason, the whole air directed toward the blow-out nozzle is greatly curved, and a vortex is more likely to be generated near the inner surface of the side portion of the main duct downstream of the upper portion of the connecting portion. , The generation of vortices is suppressed, which prevents large separation of air from the inner surface of the side of the blow-out nozzle connected to the downstream side of the upper part of the connection portion, and also prevents turbulence. Is also suppressed, and it is made to flow upward along the side part of the blowing nozzle.

Therefore, by preventing the above-described peeling, the amount of air blown out from the side of the blow-out nozzle is sufficiently 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 part 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 according to a first embodiment.

FIG. 2 is an overall rear view of the defroster duct according to the first embodiment, as viewed from the passenger compartment side;

FIG. 3 is a cross-sectional view taken along line 3-3 of FIG. 2 in the first embodiment.

FIG. 4 is a partially enlarged partial sectional view of FIG. 2 in the first embodiment.

FIG. 5 is a diagram corresponding to FIG. 1 in a second embodiment.

[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 31 Others End 32 Connecting part 32a Upper part 32b Lower part 33 Guide surface 34 Swelling part 35 Communication path 36 Vortex 38 Pipe

Claims (1)

[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. Forming a blow nozzle that opens toward the main duct, one end is connected to a side portion of the main duct in the vehicle width direction, and the other end is provided with a side duct extending toward the side window glass; In a vehicle defroster duct structure in which an upper portion of a connecting portion between a side portion and one end portion of the side duct projects inward of the main duct in a vehicle width direction than a lower portion of the connecting portion, an upper portion of the connecting portion A communication path that allows the space in the lower main duct to communicate with the space in the upper main duct from above
An automobile defroster duct structure formed on an upper portion of the joint.