JP3779126B2 - Engine intake manifold intake pipe and method of installing the intake pipe - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an intake pipe of an intake manifold of an engine and a method for mounting the intake manifold, and more particularly to an improvement in a technique for inserting an end of the intake pipe into a collector or a hole of a flange of the intake manifold.
[0002]
[Prior art]
The intake manifold is for collecting a part or all of a plurality of intake pipes for a multi-cylinder engine into one, so that intake interference does not occur and intake distribution is made uniform. Has the function to make.
[0003]
As shown in FIG. 5, the conventional intake manifold 1 includes a collector 2, a flange 3, and an intake pipe 4. As shown in FIG. 6, the intake pipe 4 is inserted into a hole 5 formed in the collector 2 or the flange 3, and is fixed to the collector 2 or the flange 3 by brazing 6 or welding.
[0004]
[Problems to be solved by the invention]
By the way, the intake pipe 4 of the above-mentioned prior art is simply inserted and fixed to the hole portion 5 as shown in FIG. 6, so that the vibration is concentrated on the fixed portion 6 due to the vibration of the automobile or the like. Is amplified, and cracks are generated in the fixing portion 6, and the cracks may progress and the intake pipe 4 may be broken.
[0005]
The present invention has been made to solve such a problem, and an object of the present invention is to provide an intake pipe and a method for attaching the intake pipe that are free from cracks and breakage.
[Means for Solving the Problems]
In order to solve the above-described problems of the prior art, according to the present invention, in an intake pipe having an end connected to a collector or flange of an intake manifold of an engine, the outer peripheral surface of the end of the intake pipe is axially arranged. A plurality of extending protrusions are formed. These protrusions are tapered toward the end of the intake pipe and expand in the circumferential direction so that the protrusions are fixed to the surface of the collector or flange. An intake manifold intake pipe is provided.
[0006]
Further, according to the present invention, there is provided an intake pipe mounting method in which an end portion of an intake pipe of an intake manifold of an engine is inserted into a hole of a face part of a collector or a flange, and a plurality of tapers extending in an axial direction on an outer peripheral surface A punch having a protruding portion formed thereon, and press-fitting the punch into the end portion of the intake pipe with the front end first, to the outer peripheral surface of the end portion of the intake pipe to the end portion of the intake pipe A plurality of tapered axial protrusions that increase in height and expand in the circumferential direction are formed, and these protrusions are fixed to a surface portion of the collector or the flange by joining means such as brazing or welding. An intake manifold attachment method for an intake manifold is provided.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of an intake pipe of the present invention will be described with reference to FIGS.
[0008]
In addition, since the structure of an intake manifold is the same as the prior art, the description is abbreviate | omitted.
[0009]
As shown in FIG. 1, the intake pipe 10 of the present invention is inserted into the hole 14 formed in the surface portion 13 of the collector 2 or the flange 3 at the end for mounting, and brazed at the hole 14. Alternatively, it is fixed to the letter 2 or the flange 3 by welding W or the like.
[0010]
As shown in FIGS. 1 and 2, for example, at four locations on the outer peripheral surface of the end portion for attaching the intake pipe 10, tapered protrusions 16 that increase toward the end portion are provided in the axial direction of the intake pipe 10. Form at an equal angle. These protrusions 16 are formed as follows. That is, as shown in FIGS. 3 and 4, the punch 18 having the tapered axial protrusion 17 is formed by cold press-fitting from the end of the intake pipe 10. Then, after the intake pipe 10 is inserted into the hole portion 14, the protrusion 16 is fixed to the surface portion 13 by brazing or welding W.
[0011]
Note that the intake pipe 10 used in the above embodiment may be selected and used for the collector 2 and / or the flange 3 according to the degree of vibration.
[0012]
【The invention's effect】
As described above, the intake pipe of the intake manifold according to the present invention forms a plurality of protrusions that protrude in the axial direction on the outer peripheral surface of the end portion of the intake pipe and that are tapered toward the end portion. As a result, the cross-sectional area in the circumferential direction along the axis increases, stress concentration can be prevented, cracks and breakage do not occur with respect to vibration, and the structure is inexpensive and simple.
[0013]
Further, according to the intake manifold mounting method of the present invention, the intake pipe can be mounted efficiently.
[Brief description of the drawings]
FIG. 1 is a side view showing a state in which an intake pipe of the present invention is attached to a collector or a flange.
FIG. 2 is a cross-sectional view taken along line AA in FIG.
FIG. 3 is a side view of a punch used in the intake pipe mounting method of the present invention.
4 is an end view of FIG. 3;
FIG. 5 is a perspective view of a conventional intake manifold.
6 is a cross-sectional view taken along line BB in FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Intake manifold 2 Collector 3 Flange W Brazing or welding part 10 Intake pipe 13 Surface part 14 Hole part 16 Projection part 17 Projection part 18 Punch

Claims (2)

In the intake pipe with the end connected to the collector or flange of the intake manifold of the engine,
A plurality of protrusions extending in the axial direction are formed on the outer peripheral surface of the end portion of the intake pipe, and these protrusions are formed in a tapered shape that increases toward the end of the intake pipe and extends in the circumferential direction. An intake manifold intake pipe characterized in that a portion is fixed to the surface of the collector or flange. An intake pipe mounting method in which an end of an intake pipe of an intake manifold of an engine is inserted into a hole in a collector or flange surface,
By preparing a punch having a plurality of tapered protrusions extending in the axial direction on the outer peripheral surface and press-fitting the punch into the end of the intake pipe with the front end first, the end of the intake pipe A plurality of tapered axial protrusions are formed on the outer peripheral surface of the collector or the flange, and the protrusions extend in the circumferential direction, and the protrusions are brazed or welded to the surface of the collector or flange. An intake manifold mounting method for an intake manifold, wherein the intake manifold is fixed by joining means.

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