JPH0143923Y2 - - Google Patents

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to a structure for connecting air ducts installed in automobiles.

<Prior Art> In a synthetic resin air duct installed in an automobile, two adjacent air ducts are connected to each other. The conventional bonding structure is as shown in Figure 4.
At the joint between one air duct 1a and the other air duct 1b, a boss 3 having a screw hole 4 is formed on the outer surface of one air duct 1a, and a protrusion 5 facing the boss 3 is provided on the other air duct 1b. A screw 6 is passed through this protrusion 5 and screwed into a screw hole 4 of the boss 3.

<Problems to be solved by the invention> In the above conventional joint structure, the boss 3 is
It is necessary to align the and the protruding piece 5 and maintain this alignment before screwing in the screw 6, which poses difficulties in connection workability, and if the tightening of the screw 6 loosens due to vibration etc. In addition, there is a possibility that resonance noise may be generated in the connecting portion 2 of the air ducts 1a and 1b, and there is also the problem that a separate screw 6 is required.

The present invention has been improved so that it can be connected easily and reliably with one touch without using screws.

<Means for solving the problem> The present invention connects two air ducts together, and at the joint of both air ducts, a guide groove is provided on the outer surface of one air duct, and a guide groove is provided on both sides of this guide groove. A locking protrusion is provided on the outer surface of the other air duct, a convex arc-shaped hollow protrusion that fits into the guide groove, and an engaging pawl that is engaged with the locking protrusion on both sides of the hollow protrusion. It was established.

<Function> In this invention, a convex arc-shaped hollow protrusion provided on the other air duct is fitted into a guide groove formed on one air duct, and the engagement pawl engages with the locking protrusion. It connects both air ducts.

<Example> Hereinafter, an example of the present invention will be described based on FIGS. 1 to 3. In FIG. 1, 1a is one air duct, and 1b is the other air duct. In the present invention, a guide groove 7 is formed on the outer surface of one air duct 1a at the joint portion of both air ducts 1a and 1b.
and locking protrusions 8 having tapered surfaces 8a are provided on both sides of the guide groove 7. Further, on the outer surface of the other air duct 1b, there is a convex arc-shaped hollow protrusion 9 that can be fitted into the guide groove 7, and on both sides of this hollow protrusion 9, engaging claws that are engaged with the engagement protrusions 8 are provided. 10.

Since the present invention has the structure as described above, both air ducts 1a and 1b are connected by fitting the hollow protrusion 9 of the other air duct 1b into the guide groove 7 of one air duct 1a as shown in FIG. Ru. When the hollow protrusion 9 is fitted into the guide groove 7, since the hollow protrusion 9 has a convex arc shape, the convex arc surface is elastically deformed and the force of fitting with the guide groove 7 is increased. Further, by the action of fitting the hollow protrusion 9 into the guide groove 7, as shown in FIG. The engaging pawl 10 slides in a curved manner along the tapered surface 8a of the locking protrusion 8, and when it passes the top of the tapered surface 8a, the engaging pawl 10 elastically restores itself and is locked to the locking protrusion 8. This is to prevent it from coming off.

<Effects of the invention> As described above, according to the invention, since the connecting structure is such that a convex arc-shaped hollow protrusion provided on the other air duct is fitted into a guide groove provided on one air duct, both air ducts can be connected with one touch. Since the hollow protrusion has a convex arc shape, it is elastically deformed and fitted into the guide groove, increasing the fitting force, and the elasticity of the hollow protrusion prevents rattling. do. In addition, since the engaging claw is engaged with the locking protrusion by the fitting operation of the hollow protrusion and is prevented from coming off, the two air ducts are joined together by screws in cooperation with the fitting of the hollow protrusion and the guide groove. It has the advantage that it can be easily and reliably carried out without using separate parts such as.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of the present invention, Fig. 2 is a cross-sectional view of the hollow protrusion and the guide groove in a fitted state, Fig. 3 is a cross-sectional view of the engagement claw and the locking protrusion in the engaged state, and Fig. FIG. 4 is a perspective view showing a conventional coupling structure. 1a, 1b...air duct, 7...guide groove, 8...
Locking protrusion, 9...Hollow protrusion, 10...Engaging claw.

Claims (1)

[Scope of utility model registration request] It connects two air ducts, and at the joining part of both air ducts, a guide groove is provided on the outer surface of one air duct, locking protrusions are provided on both sides of this guide groove, and a locking protrusion is provided on the outer surface of the other air duct. A coupling structure for an air duct for an automobile, comprising: a convex arc-shaped hollow protrusion that fits into the guide groove; and engagement claws that are engaged with the engagement protrusions on both sides of the hollow protrusion.