US20040183331A1

US20040183331A1 - Structure for supporting an instrument panel by a defroster nozzle

Info

Publication number: US20040183331A1
Application number: US10/743,040
Authority: US
Inventors: Yasunobu Yamazaki; Brian Johnson
Original assignee: Mitsubishi Motors Corp; Collins and Aikman Corp
Current assignee: Collins & Aikman Products LLC; Mitsubishi Motors Corp
Priority date: 2002-12-25
Filing date: 2003-12-23
Publication date: 2004-09-23
Also published as: US20060108824A1; JP2004203244A; US7118154B2

Abstract

A structure for supporting an instrument panel by a defroster nozzle whereby sufficient rigidity can be imparted to the top of the instrument panel. A supporting member is attached to an upper wall of the defroster nozzle arranged inside the instrument panel and is disposed in contact with the instrument panel on the surface one another to support same.

Description

CROSS-REFERENCE TO RELATED APPLICATION

This nonprovisional application claims priority under 35 U.S.C. 119(a) on Patent Application No. 2002-375218 filed in Japan on Dec. 25, 2002, the entire contents of which are incorporated herein by reference.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention relates to a supporting structure for an instrument panel of a motor vehicle, and more particularly, to a structure for supporting an instrument panel by a defroster nozzle.

2. Description of the Related Art

An automotive air conditioner provides a comfortable environment for occupants of the vehicle in all climatic and driving conditions, prevents fogging and frosting of the windshield etc. to secure the driver's range of vision, and also permits safe and comfortable driving, and thus most of motor vehicles are equipped with an air conditioner. The air conditioner is usually arranged in the vehicle body at a location under an approximately central portion of the instrument panel, and conditioned air is guided through an air duct arranged inside the instrument panel and let out from vents located in the vehicle compartment. Also, a defroster is provided for eliminating fogging of the windshield and adapted to eject warm air toward the inside of the windshield from thereunder, thus removing fogging of the inside of the windshield.

The air conditioned by the air conditioner flows up toward the vents while pushing the ceiling wall of the air duct upward, and thus the joint between the inlet of the air duct and the air outlet may possibly become separated, causing leakage of the air. To prevent this, an air conditioner air duct has been proposed wherein the air duct arranged inside the instrument panel is provided with a rib, as an abutment, which is disposed in contact with the inside surface of the top of the instrument panel (see Unexamined Japanese Patent Publication No. H08-118942 (hereinafter referred to as Patent Document 1), for example).

The instrument panel is arranged along the overall width of the driver's and front passenger's seats of the vehicle, and a front end portion thereof extends to the bottom of the windshield and is provided with an opening for a defroster nozzle. Usually, the instrument panel is a resin molded article and has a reinforced structure such that the instrument panel is supported at its front portion by a deck cross member through brackets, supported at its rear portion by brackets extended downward from the deck cross member, and supported at its both sides by front pillars. However, the offset of the central portion of the instrument panel from the deck cross member is large, giving rise to a problem that the central portion is liable to be bent or warped because of its low rigidity. Especially in the case of a wide deck type instrument panel having an increased dimension between its front and rear ends, the rigidity of the central portion is noticeably low.

A rib may be formed on the inside surface (underside) of the instrument panel near the central portion thereof so that the central portion may be supported by the air duct etc. of the air conditioner located under the instrument panel. If such a rib is formed on the inside surface of the instrument panel, however, a problem arises in that a sink mark may appear on the outside surface of the instrument panel, impairing the appearance. Also, in the case where there is a considerable distance (large space) between the instrument panel and the air duct etc., the rib needs to be lengthened, which leads to poor moldability. Further, in the case of the structure disclosed in Patent Document 1 wherein the air conditioner air duct is provided with a rib which is disposed in contact with the inside surface of the top of the instrument panel, not only the moldability is poor but a wide area cannot be secured for supporting the instrument panel. With this structure, it is difficult to increase the rigidity of the top of, in particular, a wide deck type instrument panel.

SUMMARY OF THE INVENTION

An object of the present invention is to provide a structure for supporting an instrument panel by a defroster nozzle capable of imparting sufficient rigidity to the top of the instrument panel.

The present invention provides a structure for supporting an instrument panel, comprising: a defroster nozzle arranged inside the instrument panel; and a supporting member disposed on an upper wall of said defroster nozzle and contacts with the instrument panel on the surface one another to support the instrument panel.

Thus, sufficient rigidity can be imparted to the top of the instrument panel, thereby effectively preventing bending or warping of the top of the instrument panel.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a perspective view showing an assembled state of a defroster nozzle used in an instrument panel supporting structure according to the present invention; and [0012]
FIG. 2 is a sectional view taken along line II-II in FIG. 1.[0013]

DETAILED DESCRIPTION

A preferred embodiment of the present invention will be hereinafter described in detail with reference to the drawings which are given by way of illustration only. [0014]
FIG. 1 is a perspective view of a defroster nozzle used in an instrument panel supporting structure according to the present invention, and FIG. 2 is a sectional view taken along line II-II in FIG. 1. As shown in FIGS. 1 and 2, the [0015] defroster nozzle 1 comprises three members, that is, a defroster nozzle front member 2, a defroster nozzle rear member 3, and a defroster nozzle supporting member 4 as a member for reinforcing an instrument panel 6. The defroster nozzle front member 2 has a front wall 2 a located on one side of the defroster nozzle 1 closer to the front of a vehicle body, and a lower wall 2 b continuous with the front wall. The defroster nozzle rear member 3 has an upper wall 3 a and right and left side walls 3 b, 3 b continuous with the upper wall. The front and rear members are combined to form an air duct.
Specifically, the air duct [0016] 5 (FIG. 2) is defined by the front wall 2 a and lower wall 2 b of the defroster nozzle front member 2 and the upper wall 3 a and both side walls 3 b of the defroster nozzle rear member 3. The air duct 5 branches off into front defroster nozzles 5 a, 5 a opening upward and side defroster nozzles 5 b, 5 b opening sideways on the right and left sides, respectively. The lower wall 2 b of the defroster nozzle front member 2 and the upper wall 3 a and side walls 3 b of the defroster nozzle rear member 3 have flanges 2 c and 3 c protruding from their respective lower edges to be connected to an air duct of an air conditioner.
The defroster [0017] nozzle front member 2 also has flanges 2 d, as joint faces, protruding from peripheral edges of the lower wall 2 b thereof, and assembling bosses 2 e are formed on the flanges 2 d. Assembling bosses 2 e are also formed on an inside surface of the upper portion of the front wall 2 a so as to be oriented in the same direction. A plurality of, for example, four mounting portions 2 f for mounting the defroster nozzle 1 to the vehicle body protrude integrally from the front wall 2 a of the defroster nozzle front member 2.
The defroster nozzle [0018] rear member 3 has flanges 3 d protruding from peripheral edges of lower portions of the side walls 3 b thereof, as joint faces corresponding to the flanges 2 d of the defroster nozzle front member 2, and mounting holes 3 e for receiving the respective assembling bosses 2 e are formed in the flanges 3 d. A front end portion of the upper wall 3 a is curved upward and has mounting holes 3 e formed therein for receiving distal ends of the respective assembling bosses 2 e. Also, mounting portions 3 f for mounting the defroster nozzle 1 to the vehicle body protrude integrally from both sides of the upper wall 3 a. The assembling bosses and mounting holes for joining the defroster nozzle front and rear members 2 and 3 together may be formed such that either of the flanges 2 d and 3 d are provided with the assembling bosses and the other with the mounting holes. In the case where the assembling bosses 2 e are formed on the flanges 2 d of the defroster nozzle front member 2, the assembly of the defroster nozzle supporting member 4 is facilitated, as described later.
The defroster nozzle supporting member [0019] 4 has a pair of supports 4 a each having a rectangular external form. Each support 4 a is in the form of a box opening downward and having an upper surface (bottom) 4 d. Specifically, as shown in FIG. 1, the defroster nozzle 1 is bifurcated right and left along the width direction of the vehicle, and the supports 4 a are arranged on the bifurcated right and left portions of the defroster nozzle 1, respectively, with a space therebetween. The supports 4 a are connected to each other by a connecting part 4 b continuous with lower edges of the respective rear walls.
Right and left sides of the connecting [0020] part 4 b are continuous with lower edges of outer side walls of the right and left supports 4 a, respectively, thus forming flanges 4 c. The defroster nozzle supporting member 4 is placed on a central portion of the upper wall 3 a of the defroster nozzle rear member 3. Specifically, the connecting part 4 b and the flanges 4 c are shaped so as to match the shape of the upper wall 3 a, and the supports 4 a are supported at their lower ends by the upper wall 3 a in contact therewith.
The height of the supports [0021] 4 a from the upper wall 3 a of the defroster nozzle rear member 3 to their upper surfaces 4 d is set to a height which is necessary for the supports 4 a to come into contact with and support the inside surface of a central portion 6 a of the instrument panel 6. Because of the box-like shape, the supports 4 a have increased rigidity and permit the areas of the upper surfaces 4 d to be enlarged, thus making it possible to contact with inside surface of the central portion 6 a of the instrument panel 6 on the surface one another with a large contact area to support the instrument panel 6. Further, the box-like shape permits the supports 4 a to be increased in height while ensuring sufficient rigidity, and accordingly, the defroster nozzle can be easily applied to vehicles having a long distance (large space) between the defroster nozzle and the instrument panel 6. The defroster nozzle supporting member 4 is molded separately from the defroster nozzle rear member 3, and it is therefore possible to prevent the formation of a sink mark, which appears on the surface of the defroster nozzle rear member 3 when the two members are molded as a one-piece member.
The connecting [0022] part 4 b and the flanges 4 c have mounting holes 4 f, 4 g and 4 h formed therein. The central mounting hole 4 f is a circular hole which also serves as positioning means for restraining the supporting member from being displaced to the front or the rear or to sides. The mounting holes 4 g located on both sides of the central hole are each an elongate hole elongated sideways, and the mounting holes 4 h in the flanges 4 c are circular holes slightly larger than the mounting hole 4 f. Support-mounting bosses 3 h are formed on the upper wall 3 a of the defroster nozzle rear member 3 at locations corresponding to the mounting holes 4 f, 4 g and 4 h, respectively, and are oriented in a direction identical with that of the assembling bosses 2 e. The mounting hole 4 f can receive the corresponding support-mounting boss 3 h, and the mounting holes 4 g can receive the corresponding support-mounting bosses 3 h even if the bosses are slightly displaced to sides. The mounting holes 4 h can receive the corresponding support-mounting bosses 3 h even if the bosses are slightly displaced to the front or the rear or to sides. In this manner, displacement of the support-mounting bosses 3 h relative to the respective mounting holes 4 f to 4 h of the defroster nozzle supporting member 4 can be absorbed, whereby the assembly of the defroster nozzle supporting member 4 is facilitated. Also, the mounting hole 4 f, which also serves as positioning means, permits the supporting member 4 to be accurately positioned and mounted to the upper wall 3 a of the defroster nozzle rear member 3.
The defroster [0023] nozzle front member 2, the defroster nozzle rear member 3 and the defroster nozzle supporting member 4 are formed at the same time by molding resin in a single mold (3-cavity type). Such simultaneous formation by means of a single mold makes it possible to reduce mold costs. Also, since the defroster nozzle supporting member 4 is formed as a separate member, the shape thereof can be changed as desired and the freedom of layout widens.
The [0024] flanges 2 d and 3 d of the defroster nozzle front and rear members 2 and 3, which constitute the joint faces, are brought into contact with each other, with the assembling bosses 2 e inserted into the respective mounting holes 3 e. Also, the defroster nozzle supporting member 4 is placed on the upper wall 3 a of the defroster nozzle rear member 3, with the support-mounting bosses 3 h inserted into the respective mounting holes 4 f to 4 h. Then, the distal ends of the assembling bosses 2 e and support-mounting bosses 3 h are heated and melted at the same time, to weld the bosses to the peripheral edges of the respective mounting holes 3 e and 4 f to 4 h. In this manner, the defroster nozzle 1 is fabricated.
The assembling [0025] bosses 2 e formed on the flanges 2 d of the defroster nozzle front member 2 are oriented in the same direction as the support-mounting bosses 3 h formed on the upper wall 3 a of the defroster nozzle rear member 3. Accordingly, the defroster nozzle front and rear members 2 and 3 and the defroster nozzle supporting member 4 can be assembled with ease. Also, a welding machine used for joining the members may have a simple construction, and the welding requires only a simple operation, thus enhancing the work efficiency. Further, since the defroster nozzle supporting member 4 and the defroster nozzle front and rear members 2 and 3 are molded at the same time and also are welded together at the same time, man-hour can be cut down and the manufacturing and tooling costs can be minimized.
The [0026] defroster nozzle 1 is arranged inside the instrument panel 6, as shown in FIG. 2. At this time, the inlet of the air duct 5 is connected to an air outlet of the air conditioner. Also, the defroster nozzle 1 is positioned such that the front defroster nozzles 5 a, 5 a each open into an opening 6 c of the instrument panel 6 and are situated inside a windshield 7 close to the bottom thereof, and that the side defroster nozzles 5 b, 5 b are directed toward the windows of respective front doors (not shown).
The [0027] instrument panel 6 is a wide type, for example, and is supported at its front portion by deck brackets, supported at its rear portion by brackets connected to the deck brackets, and supported at its both sides by front pillars (none of the brackets and pillars are shown). Recesses 6 b are formed in the inside surface of the central portion 6 a at locations corresponding to the upper surfaces 4 d of the respective supports 4 a of the defroster nozzle supporting member 4. The upper surfaces 4 d of the supports 4 a of the defroster nozzle supporting member 4 abut against the respective recesses 6 b and support the central portion 6 a from below. The supports 4 a are box-shaped and thus have increased rigidity and also the upper surfaces 4 d have a large area, as mentioned above. Accordingly, the inside surface 6 b of the central portion of the instrument panel 6 can be securely supported on the surface with a large contact area. This structure imparts sufficient rigidity to the central portion of the top of the wide type instrument panel 6 and thus can effectively prevent the top of the instrument panel from being bent or warped.
In the foregoing embodiment, the defroster nozzle supporting member [0028] 4 is provided with a pair of supports 4 a. The number of supports 4 a is, however, not limited to two, and a single or three or more supports 4 a may be provided instead.

Claims

What is claimed is:

1. A structure for supporting an instrument panel, comprising:

a defroster nozzle arranged inside the instrument panel; and

a supporting member disposed on an upper wall of said defroster nozzle and contacts with the instrument panel on the surface one another to support the instrument panel.

2. The structure according to claim 1, wherein said supporting member includes at least one support having a rectangular external form and formed separately from said defroster nozzle.

3. The structure according to claim 2, wherein said support is shaped like a box opening downward and having a bottom at an upper end thereof, the bottom being disposed in contact with the instrument panel on the surface one another.

4. The structure according to claim 2, wherein said defroster nozzle is bifurcated right and left along a width direction of a motor vehicle, and

said support is arranged on each of the bifurcated right and left portions of said defroster nozzle.

5. The structure according to claim 3, wherein said supporting member has a plurality of mounting holes, the upper wall of said defroster nozzle has support-mounting bosses respectively inserted into the mounting holes, and

said supporting member is joined to said defroster nozzle by heating and melting the support-mounting bosses.

6. The structure according to claim 5, wherein said defroster nozzle includes a defroster nozzle front member having a front wall and a lower wall continuous with the front wall, and a defroster nozzle rear member having an upper wall and side walls continuous with the upper wall, the defroster nozzle front member and the defroster nozzle rear member being assembled to form an air duct,

the defroster nozzle front member and the defroster nozzle rear member have flanges protruding from peripheral edges thereof, respectively, and constituting joint faces, the flanges of one of the defroster nozzle front and rear members have a plurality of assembling bosses formed thereon, the flanges of the other of the defroster nozzle front and rear members have a plurality of mounting holes formed therein for receiving the respective assembling bosses, and

the defroster nozzle front and rear members are joined together by heating and melting the assembling bosses at the same time that the support-mounting bosses are heated and melted.

7. The structure according to claim 5, wherein at least one of said plurality of mounting holes of said supporting member serves also as positioning means.

8. The structure according to claim 6, wherein said defroster nozzle front member, said defroster nozzle rear member and said supporting member are formed simultaneously by means of a single mold.

9. The structure according to claim 6, wherein the assembling bosses formed on the flanges of said defroster nozzle front or rear member are oriented in a direction identical with that of the support-mounting bosses formed on the upper wall of said defroster nozzle.