Seal for a joint or juncture – Process of static sealing
Reexamination Certificate
1997-12-19
2001-01-16
Dayoan, B. (Department: 3626)
Seal for a joint or juncture
Process of static sealing
C277S377000, C417S479000
Reexamination Certificate
active
06173959
ABSTRACT:
TECHNICAL FIELD
The present invention relates to a synthetic resin assembly having diaphragm(s) clamped between members serving to clamp a flexible diaphragm state is molded of a resin material, and these members are welded together.
BACKGROUND ART
A diaphragm type fuel pump adapted to operate under the influence of pulsative pressure generated in a crankcase or in a suction tube is known. Here, the structure of a conventional diaphragm type fuel pump will be described below with reference to
FIG. 17. A
first cover
4
including a first flexible diaphragm member
2
and an annular gasket
3
in the clamped state is arranged on one side surface of a pump casing
1
, and a second cover
7
including a second flexible diaphragm member
5
and a gasket
5
in the clamped state is arranged on the other side surface of the pump casing
1
. While the first flexible diaphragm member
2
and the annular gasket
3
are held between the pump casing
1
and the first cover
4
in the clamped state, and moreover, the second flexible diaphragm member
5
and the gasket
5
are held between the pump casing
1
and the second cover
7
in the clamped state, these members are immovably held by tightening a plurality of bolt members
8
. Usually, the first flexible diaphragm member
2
and the second flexible diaphragm member
5
are constructed by using a rubber membrane having a base fabric involved therein. However, on occasion the first flexible diaphragm
2
and the second flexible diaphragm
5
are constructed by using a resin membrane, and in this case, the gasket
3
is additionally held between the pump casing
1
and the first flexible diaphragm member
2
in the clamped state, and moreover, the gasket
6
is additionally held between the pump casing
1
and the second flexible diaphragm member
5
in the clamped state (consequently, four gaskets in total are arranged in the fuel pump in the clamped state).
A pulsation chamber
9
is formed between the first flexible diaphragm member
2
and the first cover
4
, and moreover, a pump actuating chamber
10
is formed between the pump casing
1
and the first flexible diaphragm member
2
. A certain intensity of pulsation pressure generated in an engine is introduced into the pulsation chamber
9
via an introduction passage
11
. Further, a fuel suction chamber
12
and a fuel discharge chamber
3
are formed between the pump casing
1
and the second flexible diaphragm member
5
, and moreover, an air chamber
14
, corresponding to the fuel suction chamber
12
and the fuel discharge chamber
13
, is formed between the second flexible member
5
and the second cover
7
. With such construction, fuel is introduced into the fuel suction chamber
12
via a fuel inflow hole
15
, and fuel is caused to flow out of the fuel pump via a fuel discharge hole
16
.
The pump actuating chamber
10
and the fuel suction chamber
12
are communicated with each other via a fuel passage
18
having a suction valve
17
disposed therein, while the pump actuating chamber
10
and the fuel discharge chamber
13
are communicated with each other via a fuel passage
20
having a discharge valve
19
disposed therein. The suction valve
17
serving to open the fuel passage
18
is attached to a grommet
21
, and additionally, this grommet
21
is attached to the pump casing
1
in such a manner as to enable it to move relative to the pump casing
1
. In addition, the discharge valve
19
serving to open the fuel passage
20
is attached to a grommet
22
, and this grommet
22
is attached to the pump casing
1
in such a manner as to enable it to move relative to the pump casing
1
. A coil spring
23
for biasing the first flexible diaphragm member
2
in a direction expand pulsation chamber
9
is received in the pulsation chamber
9
. In dependence on the nature of the pulsation pressure introduced into the pulsation chamber
9
from the crankcase, there arises an occasion that this coil spring
23
is used, and alternately, there arises an occasion that the coil spring
23
is not used.
With respect to the conventional diaphragm type fuel pump shown in
FIG. 17
, die cast products obtained by using aluminum or a similar metallic material by practicing a die casting process are generally used for the pump casing
1
and the first cover
4
. When there arises a malfunction that a phenomenon of vapor locking appears as fuel (especially, gasoline) receives the heat generated in the engine, there occurs an occasion that a resin material having excellent thermal insulation is used for the pump casing
1
and the first cover
4
. In this case, since there arises a malfunction when creep deformation occurs on the pump casing
1
and the first cover
4
as a plurality of bolt members
8
are tightened when a thermal plastic material is used, a thermosetting resin is used for the pump casing
1
and the first cover
4
. However, the thermosetting resin has poor productivity. In fact, a thermosetting resin exhibiting low creep deformation is available but it is difficult to use this material on the economically acceptable basis for the reason that it is expensive.
Another problem inherent to the conventional diaphragm fuel pump consists in the fact that the annular gasket
3
and the gasket
6
adapted to be held together with the first flexible diaphragm member
2
and the second flexible diaphragm member
5
in the clamped state are expensive. In addition, since the first flexible diaphragm member
2
and a single or two annular gaskets are clamped between the pump casing
1
and the second cover
4
, the second flexible diaphragm member
5
and a single or two gaskets
6
are clamped between the pump casing
1
and the second cover
7
, and finally, these members are tightened in the superimposed state, the conventional diaphragm type fuel pump is unavoidably produced at an increased cost attributable to the increased man-hours required for assembling the aforementioned members.
SUMMARY OF THE INVENTION
The present invention has been made in consideration of the drawbacks inherent to the conventional diaphragm type fuel pump as mentioned above in order to eliminate the foregoing drawbacks. Therefore, an object of the present invention is to provide a synthetic resin assembly having diaphragm member(s) clamped wherein any creep deformation is not induced even though an inexpensive thermoplastic resin is used for a main body, a first cover and a second cover, gaskets hitherto used for the conventional diaphragm type fuel pump are not required, and the number of man-hours required for constructing the diaphragm type fuel pump can be reduced,
In addition, another object of the present invention is to provide a synthetic resin assembly having diaphragm member(s) clamped wherein each welding operation at a welding location is where two synthetic resin members are welded together economized, and moreover, compression of each annular rib formed around the peripheral part of each diaphragm member in excess of a predetermined constant compression is reliably prevented.
DISCLOSURE OF THE INVENTION
According to the present invention, there is provided a synthetic resin assembly having diaphragm member(s) clamped wherein a flexible diaphragm member is clamped between two members, and the diaphragm member(s) defining a hollow space are clamped between one member and one flexible diaphragm member, wherein a resin material is used for the two members, an annular rib is formed around the outer periphery of the flexible diaphragm member, a groove receives an annular rib for the flexible diaphragm member in the compressed state on at least one of the two members, and the two members are welded together around the whole peripheral edge of the groove while the annular rib is received in the groove.
In addition, according to the present invention, the synthetic resin assembly is constructed such that a surface held in the state isolated from a supersonic welding tool is formed on one synthetic resin member prior to a welding operation, and then, as the welding operation is progres
Chiba Noriaki
Matuzaka Rui
Oikawa Kenichi
Terada Hideo
Dayoan B.
Lorusso & Loud
Mikuni Adec Corporation
Williams Mark
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