JPH0227760Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) This invention relates to a joining structure for fixing a synthetic resin pipe with a circular cross section to a plate.

(Prior Art) As a conventional structure for coupling a synthetic resin pipe to a plate, there is, for example, an inlet pipe mounting structure for an air cleaner disclosed in Japanese Utility Model Application No. 52-94507.

If this type of thing is illustrated, as shown in FIG.
2 is inserted inwardly, the stepped portion of the pipe 22 is abutted against one end surface 23 of the flange 21, and a protruding pawl 24 provided on the end surface of the pipe 22 is locked to the plate body 20. This is a protruding claw 2
A slit 26 is provided to allow the flange 4 to be bent and inserted into the flange 21 without any hindrance.

(Problem that the invention aims to solve) However, when trying to apply the above structure to the connection and fixation of circular pipes, although the pipes are fixed in the length direction, there is no means to prevent rotation. Therefore, when it is desired to specify the direction of the other end 27 of a bent pipe as shown in Fig. 3, or when a rubber hose or the like is twisted and attached to a straight pipe, it is extremely inconvenient and a rotation prevention means is required. Ru.

(Means for Solving the Problem) In order to solve the above-mentioned disadvantages, this invention is a joint structure in which longitudinal locking means and rotation preventing means are provided together. In other words, a cylindrical flange is provided around the periphery of a hole drilled in a plate, and the lower surface of the brim of the pipe is brought into contact with the lower end surface of the cylindrical flange, thereby forming an uneven step on the lower end surface of the flange. A protruding pawl protruding from the tip of a convex portion provided with a stepped shape is engaged with a concave portion of the lower end surface of the flange.

In the above configuration, the plate may be flat and the upper end surface of the flange may match the upper surface of the plate, or the plate may be curved. Furthermore, the pipe and the flange may be bonded or welded to improve sealing performance and reinforce strength.

Note that in the above description, the upward and downward directions indicate the relative relationship between the pipe and the plate, and are not limited thereto.

(Function) In the coupling structure of this invention with the above configuration, when the pipe is joined, the protruding claw of the pipe is easily inserted into the flange due to the bending of the convex part, and the upper and lower end surfaces of the flange are gripped between the collar and the protruding claw. By doing so, the pipe is fixed in the length direction, and both circumferential side surfaces of the protruding pawl come into contact with the side surfaces of the flange convex portion, thereby preventing the pipe from rotating.

(Example) This invention will be explained with reference to an example shown in FIGS. 1 and 2 A and B.

A flange 3 is provided at the periphery of a circular hole 2 drilled in a plate 1 made of synthetic resin, and its upper end surface 4 is flat, and its lower end surface 5 has a plurality of recesses 5a and projections 5b alternately forming steps. Arranged. On the other hand, a pipe 10 made of synthetic resin and having a circular cross section has a collar part 11 in the middle, and a plurality of convex parts 12a and concave parts 12b are arranged in alternating steps on the lower end surface 12 of the pipe 10, and each convex part 12a and each of the recesses 5a have the same width in the circumferential direction. A protruding pawl 13 is provided at the tip of the convex portion 12a, and the distance between the upper surface 13a and the lower surface of the collar portion 11 is equal to the distance between the upper surface 4 of the flange and the concave portion 5a on the lower end surface of the flange. It's summery.

The pipe 10 is inserted inwardly into the hole 2 of the plate body 1, and the protruding pawl 13 is engaged with the recess 5a. As a result, the flange portion 11 and the protruding pawl 13 come into contact with the upper and lower surfaces of the flange, so that the flange is not fixed in the length direction, and the protruding pawl 13 and the side surface of the flange convex portion 5b come into contact with each other to prevent rotation. FIGS. 2A and 2B show the state of connection between lines A and B in FIG. 1, respectively.

(Effects) With this invention, it is possible to easily obtain a joint structure between a plate and a pipe that has the function of preventing the pipe from moving in the length direction and preventing rotation.

The joint structure of this invention can be advantageously applied to, for example, the fixed part of a pipe when a short pipe for blow-by gas processing is fixed to the wall of a rotary car cover of an internal combustion engine, and a hose is twisted into the pipe. be.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing the structure of this invention, FIGS. 2A and 2B are sectional views showing an embodiment of this invention, and FIG. 3 is a sectional view of a conventional coupling structure. 5a... Concave portion of flange, 5b... Convex portion of flange, 11... Flange portion, 12a... Convex portion of pipe, 12b... Concave portion of pipe, 13... Projection claw.

Claims (1)

[Scope of utility model registration request] A cylindrical flange is provided around the periphery of the hole drilled in the plate, and a plurality of concave portions and convex portions are arranged alternately on the lower end surface to form a step. A collar is provided on the pipe inscribed in the hole, and a plurality of concave portions and convex portions are alternately arranged on the lower end surface of the pipe to form a step, and a protruding claw protruding outward is provided on the convex portion of the lower end surface of the pipe. established,
abutting the lower surface of the brim and the upper end surface of the flange;
A plate-to-pipe joint structure in which the upper surface of the protruding pawl is in contact with the lower surface of the flange recess, and both circumferential sides of the protruding pawl are in contact with both sides of the flange convex part.