Method of securing intake tubes in intake manifold

Details Method of securing intake tubes in intake manifold Method of securing intake tubes in intake manifold

2000-01-14

2001-09-11

Cuda-Rosenbaum, I (Department: 3726)

Metal working

Method of mechanical manufacture

Heat exchanger or boiler making

C029S890052, C029S507000, C029S523000

Reexamination Certificate

active

06286213

ABSTRACT:

BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to an intake manifold for an engine and particularly, a method of securing intake tubes in an intake manifold.
2. Description of the Related Art
Intake manifolds for combining intake tubes to a multi-cylinder engine to groups or a single bundle are arranged to prevent interference between the intake tubes and to provide uniform distribution of intake air.
A known intake manifold
1
includes, as shown in
FIG. 8
, a collector
2
formed of aluminum die-casting, a plurality of intake tubes
3
made of aluminum pipe, and an intake tube mount
4
formed of aluminum die-casting for fixedly mounting the intake tubes
3
to the engine. The intake tubes
3
are inserted into intake tube mounting rings
5
formed on the collector
2
and the intake tube mount
4
as shown in FIG.
9
and fixedly joined to the intake tube mounting rings
5
by point welding such as spot welding at points A or A′ on the periphery shown in FIG.
9
.
In such a conventional method of securing the intake tubes
3
to the intake tube mounting rings
5
, brazing in a furnace for jointing the intake tube mount
4
with the intake tube mounting rings
5
may produce a leakage of brazing material from the points A of spot welding between the intake tubes
3
and the intake tube mounting rings
5
. Accordingly, an extra amendment for the brazing is needed and the leakage of brazing material runs out to a portion B of the intake tube mounting ring
5
, thus resulting in loss of the brazing material. This may cause a sealing failure when the intake manifold
1
is installed in the engine. Also, the point welding such as spot welding may be likely to have the intake tubes
3
joined to the intake tube mounting rings
5
in tilted state as denoted by
3
′ in FIG.
9
.
SUMMARY OF THE INVENTION
The present invention is intended to eliminate the foregoing problems and its object is to provide a method of securing the intake tubes in an intake manifold with producing no leakage of brazing material from joint interface between the intake tubes and the intake tube mounting rings.
For eliminating the foregoing problems of the prior art, a method of securing intake tubes in an intake manifold according to the present invention is provided comprising the steps of: inserting one end of an intake tube into a corresponding intake tube mounting ring; inserting into insert areas of the intake tube mounting ring and the intake tube a jig of a tubular shape which includes separate sections defined by parallel slits extending to a predetermined length along the axis and has a plurality of projections on the outer side of the separate sections thereof; inserting into the interior of a tubular body of the jig a pressing tool which is a bar reduced in the diameter towards its front end; and driving the pressing tool to advance relative to the insert areas using a pressing means so that the projections of the jig move radially and causes the outer side of the intake tube to press against the inner side of the intake tube mounting ring, whereby the intake tube can be joined to the intake tube mounting ring by its plastic deformation.
Accordingly, while leakage of the brazing material can be prevented by some of the projections, the joint between the intake tubes and the intake tube mounting rings can be ensured by the other of the projections.
It may be arranged that the projections of the jig comprise spot projections and an annular projection and the spot projections are used for joining the intake tube to the intake tube mounting ring while the annular projection is used for the plastic deformation to prevent leakage of brazing material. In this case, the jig has a plurality of (for example, three) spot projections and an annular projection spaced from the spot projections which act in combination to prevent the intake tubes from being joined at tilted state to the intake tube mounting rings.
Therefore, the intake tubes can be reliably prevented from being joined at tilted state to the intake tube mounting rings.


REFERENCES:
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patent: 4713870 (1987-12-01), Szalvay
patent: 5127157 (1992-07-01), Oetiker
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patent: 6131265 (2000-10-01), Bird
patent: 3724675 (1989-02-01), None
patent: 97/41377 (1997-11-01), None

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