JPH0224936Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) This invention relates to a bracket gripping structure for an air duct for an automobile, and particularly to a bracket gripping structure for a plastic air duct used in a place where high temperatures occur such as an engine room.

(Conventional technology) An air duct is placed in the engine room of a car to supply outside air to the engine, but because the heat generated by the engine causes the engine room to reach a considerable high temperature, conventionally the air duct was made of metal. It is used.

However, when manufacturing this metal air duct, it is necessary to press a metal plate and then weld it to form it into a duct shape, which has the drawback that the process is complicated and involves multiple steps.In addition, it is heavy. It has the fatal problem of being large.

Therefore, in order to avoid the above-mentioned problems, in recent years, air ducts made of plastic, for example, blow molded products, have been developed.

(Problem to be solved by the invention) By the way, as mentioned above, the temperature inside the engine room is quite high, and the tightening stress of the bracket is applied to the mounting part, so the duct area around the bracket mounting part is particularly affected. This plastic air duct has the serious disadvantage of being easily deformed due to creep and reducing its installation strength, which is a major hindrance to putting this plastic air duct into practical use.

However, in this invention, in order to prevent deformation around the bracket attachment part of the plastic air duct, a plastic reinforcing curler is wrapped around the outer periphery of the bracket gripping part of the plastic air duct, and the bracket is attached to the outer surface of the curler. The aim is to provide a structure based on

In addition, this idea also solves installation problems such as the generation of gaps between the two due to the difference in heat shrinkage, which often occurs in structures where a reinforcing curler is wrapped around an air duct as shown above, as well as looseness and insufficient adhesion. The purpose is to provide a structure that can effectively solve the problem.

(Means for Solving the Problems) That is, in this invention, a plastic reinforcing curler is wound around the outer periphery of the bracket gripping part of a plastic air duct, and the bracket is attached to the outer surface of the curler. The plate surface portion has a through hole portion and an outer boss portion, and a flange portion having a larger inner side is formed at both end edges of the plate surface portion, and a resin constituting the air duct is contained in the through hole portion. A resin constituting the air duct is wrapped around the flange of the side end edge, and the reinforcing curler is integrally joined to the air duct, and the boss of the reinforcing curler is connected to the hole of the bracket. The present invention relates to a bracket gripping structure for an automobile air duct, which is characterized in that the brackets are attached in an engaged manner.

(Example) This invention will be explained below along with an example according to the attached drawings.

FIG. 1 is an overall perspective view of the area around the bracket gripping part of an automobile air duct showing an embodiment of this invention;
Figure 2 is an enlarged cross-sectional view taken along line 2-2 in Figure 1, Figure 3 is a cross-sectional view taken along line 3-3 in Figure 2, and Figure 4 shows an air duct integrally blown using a reinforcing curler as an insert material. FIG. 5 is an enlarged cross-sectional view of the main part, with some parts omitted, showing a state of forming, and FIG. 5 is a perspective view showing an example of the reinforcing curler.

As shown in FIG. 1, the air duct 10 is made of a plastic blow molded product formed into a predetermined cylindrical shape. As the plastic constituting the duct 10, one having excellent heat resistance such as polyamide resin or its glass fiber reinforced resin is preferably used. In addition, when glass fiber is contained, it is desirable for the proportion thereof to be within the range of 10 to 40% by weight from the viewpoint of molding.

A metal bracket 30 is attached to the air duct 10 to hold the duct in a predetermined position within the engine compartment of the vehicle body.

In this invented structure, a plastic reinforcing curler 20 is attached to the bracket gripping part 11 of the air duct 10 to which the bracket 30 is attached.
is wrapped in the following configuration.

As shown in FIG. 5, the plastic reinforcing curler 20 used in this invented structure has a through hole 23 and an outer boss 25 on the plate surface 21, and has a plate surface 21 with a through hole 23 and an outer boss 25 on both side edges of the plate surface. A flange portion 27 is formed which is a stepped portion or a tapered portion that is larger on the inside. The reinforcing curler 20 itself is a ring-shaped item as it is wrapped around the outside of the air duct, but for convenience in molding etc., it is possible to use half-shaped pieces 20P, 20P as shown in the figure. Highly recommended.

This reinforcing curler 20 is integrally joined to the air duct 10 by the following structure. That is, as is clear from the cross-sectional views of FIGS. 2 and 3, the resin 10A constituting the air duct 10 enters the through hole 23, and the air duct is inserted into the flange 27 of the side edge. The reinforcing curler is wrapped with the constituent resin 10A and is integrally bonded to the air duct 10. In the figure, reference numeral 23A is a resin entry portion, and 27A is a wrapping portion.

On the other hand, the outer boss portion 25 of the reinforcing curler 20
is attached by engaging with the hole 35 of the bracket 30 as shown in FIG.

The reinforcing curler 20 is preferably attached to the air duct 1
It is made of plastic that is the same type or has a coefficient of linear expansion similar to that of the resin that makes up the main body. For example, when the duct 10 is made of polyamide resin or its glass fiber-reinforced resin, the reinforcing curler 20 is also made of the polyamide resin or its glass fiber-reinforced resin, and the resin making up the reinforcing curler has a higher rigidity than the resin making up the duct. A large one is desirable.

Note that the reinforcing curler 20 is inserted in advance into a mold during blow molding of the air duct 10 and is fixed integrally with the duct. FIG. 4 is a partially enlarged sectional view of the inside of the mold 40. The reinforcing curler 20, which is the insert material, is held by an insert holding part 41 formed on the mold surface of the mold 40, and as shown in the figure, the through hole 23 is held by a holding protrusion 42 formed on the mold surface. It can be fitted and held. Of course, in this case, it goes without saying that the fitting onto the holding protrusion 42 must be shallow so that the resin entry portion 23A is formed within the through hole 23.

Reference numeral 12 in FIGS. 1 and 3 is an annular rib for defining the bracket gripping portion 11 of the air duct 10. As shown in FIG.

(Function/Effect) As shown and explained above, according to this invention, in the bracket gripping portion of the plastic air duct, the plastic reinforcing curler prevents the resin from entering the through hole and the flanges on both side edges. Since the air duct is integrally joined to the air duct by forming a resin encasing part on the part, the two are tightly joined together, and even if there is a difference in heat shrinkage between the two, Therefore, installation problems such as looseness and insufficient adhesion can be effectively solved.

In addition, the bracket gripping portion of the air duct is doubly reinforced by the connection of the reinforcing curlers, so that the mechanical strength of this portion is improved by several orders of magnitude.

Furthermore, since the bracket is attached by engaging with the hole of the bracket through the outer surface boss portion of the reinforcing curler, the bracket is firmly attached to the outer surface of the reinforcing curler, and its tightening stress is reduced. It is supported on the reinforcing curler and is uniformly distributed throughout the reinforcing curler.

With this structure, the clamping stress of the bracket on the air duct is relaxed, and deformation of the duct portion around the bracket mounting part due to creep is avoided, and the problem of reduced mounting strength can be solved. It became.

This invention thus enables the use of a plastic air duct in a high-temperature engine room, and has extremely high practical effects.

[Brief explanation of the drawing]

FIG. 1 is an overall perspective view of the area around the bracket gripping part of an automobile air duct showing an embodiment of this invention;
Figure 2 is an enlarged cross-sectional view taken along line 2-2 in Figure 1, Figure 3 is a cross-sectional view taken along line 3-3 in Figure 2, and Figure 4 shows an air duct integrally blown using a reinforcing curler as an insert material. FIG. 5 is an enlarged cross-sectional view of the main part, with some parts omitted, showing a state of forming, and FIG. 5 is a perspective view showing an example of the reinforcing curler. DESCRIPTION OF SYMBOLS 10... Air duct, 11... Bracket grip part, 20... Reinforcement curler, 21... Plate surface part, 2
3...Through hole, 23A...Entry part, 25...Boss part, 27...Side edge part, 27A...Wrapping part, 3
0...bracket, 35...hole.

Claims (1)

[Claims for Utility Model Registration] 1. A plastic reinforcing curler is wound around the outer periphery of the bracket gripping portion of a plastic air duct, and the bracket is attached to the outer surface of the curler, in which the reinforcing curler has a through hole and a hole in the plate surface. Flange portions having an outer boss portion and having a larger inner side are formed at both end edges of the plate surface portion, and the resin constituting the air duct enters into the through hole portion, and the side end edges A resin constituting the air duct is wrapped around the flange of the bracket, and the reinforcing curler is integrally attached to the air duct, and the boss of the reinforcing curler is attached to the bracket by engaging with the hole of the bracket. A bracket gripping structure for an automotive air duct, which is characterized by a bracket gripping structure. 2. A bracket gripping structure for an automobile air duct according to claim 1, wherein the reinforcing curler is made of plastic having a coefficient of linear expansion similar to or similar to that of the air duct.