Surge tank structure in intake manifold

Details Surge tank structure in intake manifold Surge tank structure in intake manifold

2000-04-11

2001-04-17

Kamen, Noah P. (Department: 3747)

Internal-combustion engines

Intake manifold

For engine having radiating cylinders

C123S184470

Reexamination Certificate

active

06216656

ABSTRACT:

BACKGROUND OF THE INVENTION
1. Field of Industrial Applications
The present invention relates to a surge tank structure in an intake manifold.
2. Related Art
In general, an intake manifold for use in an automobile gasoline or diesel engine has such a structure as shown in
FIG. 9
, where a plurality of branch tubes
2
are joined at one end to a cylinder head mounting flange
4
provided for installation on a cylinder head and at the other end to a surge tank
3
.
FIG. 10
illustrates an enlarged cross sectional view of the joint between the branch tubes
2
and the surge tank
3
. Each branch tube
2
is connected and inserted into the surge tank
3
. The inner wall for accepting the leading end of the branch tube
2
has a horn-like region
51
formed by changing the diameter for the purpose of moderating a change of the cross section so that the load of a suction caused by abrupt change in the cross section can be reduced. The surge tank
3
is fabricated by casting using a core for shaping the horn-like regions
51
, and the use of such a core increases production costs.
To reduce costs, a modification has been proposed, which is shown in FIG.
11
and
FIG. 12
, which is a cross sectional view taken along the line XII—XII of FIG.
11
. Here, the leading end of each branch tube
2
is flared or enlarged in its diameter to produce a horn-like flared or enlarged region
2
a
and is then mounted to a surge tank
3
. The surge tank
3
comprises two separable components, a lower member
52
and an upper member
53
. More specifically, after the branch tubes
2
having the horn-like flared or enlarged regions
2
a
have been set in their position, the upper member
53
is joined to the lower member
52
to complete the surge tank
3
. The joint between the branch tube
2
and the two tank members
52
and
53
includes semi-circular and straight regions, thus requiring higher degrees of the roundness of the overall dimensions of the branch tubes
2
and a more accurate machining of the joining portions of the lower member
52
and the upper member
53
to the branch tubes
2
. In addition, a set of pins
54
is needed for positioning the lower member
52
and the upper member
53
, thereby increasing the manufacturing cost. Moreover, any displacement between the branch tubes
2
and the two tank members
52
and
53
, may disadvantageously cause the condensed liquid or blow-by oil 0 deposited on the bottom of the lower member
52
to remain there since the condensed liquid may not be sucked into the branch tubes
2
.
SUMMARY OF THE INVENTION
The present invention has been developed in view of the above problems and its object is to provide an intake manifold which allows condensed water or blow-by oil deposited in a surge tank to be favorably discharged which can also be fabricated at lower cost without the use of cores in the casting molds. According to the present invention, a surge tank structure is provided in an intake manifold having a surge tank to which a plurality of branch tubes are joined at one end. Each branch tube is joined to a cylinder head mounting flange at one end, and the surge tank is flared or enlarged to have a horn-like shape. The surge tank comprises a main body and a top plate. The main body has through holes provided therein for accepting the branch tubes and has an open top side. The top plate is joined in a plane to the top of the main body. The main body has a bottom which has engagement recesses formed by raised or raised portions, so that each engagement recess has a horn-like surface that conforms to the horn-like shape of one end of each branch tube end.
The main body and the top plate are joined with each other in a plane, and the surge tank is tightly sealed off at the joint. Also, the branch tube is precisely positioned in the engagement recess provided in the bottom of the main body so that the horn-like shape of the branch tube end closely contacts the horn-shape surface of the bottom, hence facilitating its function of sucking up a pool of condensed water or blow-by oil deposited on the bottom of the surge tank. In other words, the structure of the surge tank is improved while fouling by condensed water or blow-by oil is reduced. Also, the surge tank can be fabricated at a lower cost since no core is used in the molds.
Preferably, after each branch tube has been inserted into its respective through holes and has been positioned in its respective engagement recesses in the main body of the surge tank, an enlarging tool is inserted from above into the main body to urge one end of each branch tube against the corresponding horn-like surface and to enlarge the same to have the horn-like shape.
Accordingly, the process can be implemented at a lower cost by removing the top plate, setting the branch tubes to the through holes in the main body, inserting the die into the main body, and performing an enlarging or flaring process with the end of each the branch tube closely contacting the horn-shape surface.


REFERENCES:
patent: 2-224836 (1990-09-01), None

Affiliated with

Also associated with

Rating

Surge tank structure in intake manifold does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Surge tank structure in intake manifold, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Surge tank structure in intake manifold will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2520514