JPS60256551A - Manufacture of strainer for fuel feeder - Google Patents

Abstract

PURPOSE:To uniform the mesh of a strainer made of wire net fixed at the inlet of fuel path by rimpling the wire net previously then forming into a cup thereafter overlapping the wire net uniformly along the rimple line. CONSTITUTION:In an electromagnetic fuel injector, a gate valve 6 is inserted reciprocally into a guide hole 3a of valve housing 3 while a movable core 7 is coupled to the rear end of the gate valve 6 and a fixed core 8 is arranged while facing with the movable core 7. A strainer 11 is inserted into the inlet of fuel path 8a made in the fixed core 8 and comprised of a cup-shaped wire net 12 an an edge metal 13 fixed to the end. Here, the wire net 12 is rimpled 12a previously then formed into a cup and fixed with an edge metal 13 at the end. Consequently, the wire net 12 can be overlapped uniformly along the rimple 12a.

Description

DETAILED DESCRIPTION OF THE INVENTION FIELD OF INDUSTRIAL APPLICATION This invention relates to a method of manufacturing a strainer mainly used in a fuel supply device for an internal combustion engine (hereinafter also referred to as engine) for an automobile.

Prior Art Conventionally, in an electromagnetic fuel injector or other fuel supply device disclosed in Japanese Utility Model Application Publication No. 57-114163, etc., a strainer formed of a wire mesh as shown in the perspective view of FIG. 2 has been used. 21 is inserted into the inlet of a fuel passage (not shown).

However, with such a strainer 21, a flat wire mesh 22 as shown in FIG. 3 is strained by a punch 24 and a die 25 as shown in FIG.
is formed, and when the mesh is deformed and enlarged, the second
As seen in the figure and FIG. 5, the folds 22a are irregular and partial. In addition, the overlapping state of the wire mesh 22 tends to be uneven, which makes it difficult to caulk the fastener 23 (FIG. 2) and makes it easy to remove it.
Ta.

OBJECTS OF THE INVENTION In order to solve the above-mentioned problems, it is an object of the present invention to provide a method of manufacturing a strainer for a fuel supply device that can always form a uniform mesh.

Structure and operation of the invention The present invention is a method for manufacturing a strainer in which a strainer formed of a wire mesh is attached to the entrance of a fuel passage, and the strainer is formed by forming creases in the wire mesh. When molded into a shape, the overlapping state is always uniform.

EXAMPLES The present invention will be described below based on drawings showing examples. FIG. 1 is a longitudinal sectional view of an electromagnetic fuel injector equipped with a strainer according to the invention.

Reference numeral 1 denotes a cylindrical ferromagnetic housing case, which consists of a front section 1a and a rear section 1b separated by a partition wall 2 having an opening in the center. 3 is the valve housing,
It is fitted and fixed to the front section 1a via an annular stopper 4 inserted in contact with the partition wall 2, and a fuel injection port 5 is provided at the tip. Reference numeral 6 denotes an on-off valve, which is inserted into a guide hole 3a provided in the valve housing 3 so as to be able to reciprocate. A movable iron core 7 is coupled to the rear end of the on-off valve 6.

A cylindrical fixed core 8 is arranged in the rear section 1b facing the movable core 7, and an electromagnetic coil 9 is wound around the outer periphery of the fixed core 8. A return spring 10 is inserted between the movable iron core 7 and the fixed iron core 8, and biases the on-off valve 1) 6 to close the fuel injection port 5 while the electromagnetic coil 9 is not energized. A fuel passage 8a is provided inside the fixed core 8, and a strainer 11 is inserted into the entrance of the fuel passage 8.

The strainer 11 includes a wire mesh 12 formed into a cup shape,
It consists of an edge fitting 13 attached to the end portion by caulking. As shown in FIG. 6, the wire mesh 12 is first flattened with creases 12a, then formed into a cup shape as shown in FIG. Attach by processing. - By the above method, the wire mesh 12 is overlapped along the crease 12a, the size of the mesh does not change, and the strength becomes uniform.

Effects of the Invention As explained above, the present invention is a method for manufacturing a strainer in which a wire mesh is formed after forming creases in a fuel supply device in which a strainer formed of a wire mesh is attached to the entrance of a fuel passage. When formed into a cup shape,
The overlapping state is always uniform along the creases, the size of the mesh does not change, and a strainer with uniform strength can be obtained 1□).

[Brief explanation of the drawing]

Figure 1 is a longitudinal sectional view of an electromagnetic fuel injector equipped with a strainer according to the present invention, Figure 2 is a perspective view of a conventional strainer, and Figures 3 (a) and (b) are wire mesh of a conventional strainer. Figure 4 is a cross-sectional view of the drawing die of the wire mesh of the strainer, Figures 5 (a) and (b) are explanatory diagrams of conventional wire mesh processing, and Figures 6 (a) and (b) are ) are a developed plan view and a cross-sectional view of a wire mesh produced by the method of this invention, FIG. 7(a),
(b) is an explanatory view of processing a wire mesh by the method of the present invention. 6... Opening/closing valve 7... Movable iron core 8... Fixed iron core 8a... Fuel passage 9... Electromagnetic coil 11... Strainer 12... Wire mesh 12a.
...Crease applicant Aisan Kogyo Co., Ltd. Company agent Patent attorney Oka 1) Hidehiko Figure 1 Figure 2

Claims (1)

[Claims] Manufacture of a strainer for a fuel supply device 1 having a strainer formed of a wire mesh attached to the entrance of a fuel passage, characterized in that the strainer is formed after making creases in the wire mesh. Method