JPS601043B2 - Manufacturing method of fuel filter - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method of manufacturing a plastic fuel filter for use in internal combustion engines.

Since the fuel filter is used to treat gasoline and diesel oil, its casing must be made of fuel oil-resistant plastic material, and the fuel filter must not have any seal leakage. be.

The fuel filter consists of a casing that has an inlet pipe and a cover that has an outlet pipe that are fixed together, and a furnace body that is placed inside the housing.The casing and the cover are fixed together using an adhesive. A method of welding and sealing by heating with a hot plate, and a method of welding and sealing using a pressure welding method such as vibration welding layer or spin welding are used. Due to the mounting position of the fuel filter, the outlet pipe installed on the cover was installed using the actual Seki Sho 52-47372.
The one provided perpendicularly to the end surface of the cover as in the first publication, and the first
As shown in the figure or in Japanese Patent Publication No. 52-44662, there is one that is provided horizontally to the end surface of the cover.

Those installed vertically can be manufactured using any of the above-mentioned fixing methods, but those installed horizontally to the end face of the cover are limited by the fixing means. That is, as shown in FIG. 1, a thin plate-shaped cover 2 having a convex portion on the flange, a cylindrical casing 3 having a concave portion on the flange, and the connecting end thereof are iron-coupled at the concave and convex portion of the upper end of the housing.
Since the concave and convex portions are tightly bound together and cannot be moved, a pressurized sealing device cannot be used, and the seal can be fixed using only adhesive methods. However, there are no suitable adhesives for this type of plastic material, and they do not function well as adhesives or sealants for steel structures, resulting in insufficient sealing, resulting in fuel leaks and fire hazards. There is. Also, special public service in 1972
A deep dish-shaped plastic cover with a flat upper and lower flange surface as in Japanese Patent No. 14662, and a cylindrical plastic casing with a flat upper and lower flange surface, whose joint ends are joined at approximately the center of the housing. In the case of welding using a pressure welding layer, a pressure jig is brought into contact with the upper surface of the flange of the cover and the lower surface of the flange of the casing, and the plastic joint surfaces are allowed to settle. On the flat part of the outer periphery of the flange, the plastic is welded by sufficient pressure, but on the inner periphery of the flange, only a small amount of force is applied, which is suppressed by the surrounding wall, resulting in insufficient welding and preventing fuel leakage. Due to the dust generated, adhesives or heat welding must be used. The present invention provides a method for manufacturing a plastic fuel filter having a horizontally oriented outlet pipe on the upper end surface of the cover using a pressure welding process, and the lower surface located near the upper end surface is flat. After fixing the furnace body to a plastic thin plate-shaped cover, which has a wall between the flange portion and the upper end surface as an outer peripheral inclined wall and a recessed portion between the outlet pipe attachment portion and the flange portion, the cover Place the cover on a pick-up tool for the cover, which has an inclined surface that the outer circumferential inclined wall contacts, and is provided with an outlet pipe relief part, and then has an inlet pipe on the closed side and a flange part with flat upper and lower surfaces on the open side. ,
A plastic cylindrical casing having an inclined wall at the base of the flange portion is sent to the cover with each flange portion facing the casing, and a casing waste tool having a shape such that the inclined wall of the casing and the lower surface of the flange are brought into contact with the casing. This manufacturing method involves vibrating the cover tool and pressurizing the cover tool while welding the entire periphery of the flange surface. The periphery is melted to form a strong seal to prevent fuel oil from leaking.

This will be explained below using examples. The fuel filter is manufactured in the following process.

The first step consists of layering the cover 2 to which the furnace overbody 17 is fixed on the cover mounting tool 18. The cover 2 is shaped like a thin plastic plate and has a fuel outlet pipe 17 oriented horizontally from the upper end surface 25, and the peripheral edge of the open end is a fourth pipe.
As shown in the figure, a welding surface 10 with a flat lower surface, a trap 11 recessed from the welding surface 10, and an annular flange 9 with a flat upper surface 10 of the trap 11 are formed. and upper end surface 2
The wall between 5 and the flange 9 located in the vicinity is the flange 9.
The outer circumferential wall 8 is inclined toward the outside, and the outer circumferential wall of the portion where the outlet pipe 7 is attached forms a recess 12 toward the inside as shown in FIG. Well-known furnace suitable material 17 for this cover 2
For example, a piece of paper in the shape of a chrysanthemum is disposed and firmly sealed with an adhesive, and the cover 2 is laminated with the outer circumferential slanted wall 8 brought into contact with the slanted surface 19 of the cover fitting 18. The cover waste tool 18 has a closing opening 20 having a diameter slightly larger than the diameter of the upper end surface 25 of the cover 2, as shown in FIGS. It has an annular inclined surface 19 having a similar angle to the wall 8, and a groove-shaped escape portion 21 for the outlet pipe 7 is provided in a part of the inclined surface 19. The second step consists of applying the welding surface 15 of the casing 5 to the twilling surface 10 of the cover 2', and further inserting the opening of the casing waste 22 into the casing 5' to abut against the flange 4.

As shown in FIGS. 2 and 6, the casing 5' is made of plastic and has a cylindrical shape, and has an inlet pipe 13 on the closed side in the direction of the center of the vehicle, and an open side with a welded surface 15 with a flat upper surface of the green part.
A trap 16 is recessed from the welding surface 15, and a lower surface 15' of the trap 16 forms a flat annular flange 4. An inclined wall is formed between the casing peripheral wall and the flange 14. Furthermore, as shown in FIG. 9, the casing waste odor 22 has a closing hole 23 having a diameter slightly larger than the diameter of the casing 5, and a slope similar to the sloped wall of the casing 5' between the closing hole 23 and the top surface of the jig. It has a surface. The third step consists of melting and fixing the fuel filter cover 2' and casing 5' by vibration welding. As shown in FIG. 10, while pressing the casing scraper 22, the cover holder 18 is vibrated from side to side, and the cover 2' and casing 5 are
' are welded to each attachment surface 10, 15. A portion of the melted plastic flows into the traps 9, 16 provided on the flanges 4, 14 as shown in FIG. 11, fills the spaces therebetween, solidifies, and serves to improve the strength of the bonded surface. Further, the burrs 24 protruding inside the cover 2 and the casing 5 are solidified as they are.
During vibration welding, the peripheral inclined wall 8 in contact with the sloped surface 19 of the cover fitting 18 generates a resultant force of the pressure on the welding surface 10 and the pressure in the left and right vibration directions, and this resultant force causes the peripheral wall to resist and exert a force. A large force is applied to the inner peripheral sides of the flanges 9 and 14 of the cover 2' and casing 5', which were not applied.

Similarly, the force applied to the casing fitting 22 is divided into parts by the inclined wall of the casing 5' which is in contact with the inclined surface of the casing fitting 22, and pressure is applied to the inner circumferential side of the flanges 9 and 14 to prevent the plastic from melting. Capture and advance. In addition, the recess 12 provided in the mounting portion of the outlet pipe 7 divides the rigidity of the outlet pipe 7 during vibration toward the inner circumferential side of the flange 9, and prevents dimensional errors such as warpage and distortion during settling of the pipe. Increase the intensity of 7. As described above, the present invention provides a fuel filter having a shape that has an outlet pipe oriented horizontally on the upper end surface of the cover, which conventionally had a weak attachment surface and could not be pressure-welded due to insufficient pressure on the inner circumferential side of the flange. The wall of the flange located near the end face is an outer periphery inclined wall, and the wall of the pipe attachment part is a recessed part, and the pressure jig is also provided with an inclined surface similar to the outer periphery inclined wall, so that the outer periphery inclined wall and the inclined surface are formed. Since they are brought into contact with each other and pressurized, pressure that can melt the plastic can be applied to the inner circumferential side of the flange of the cover and casing, making it possible to manufacture a fuel filter with a reliable seal without fuel leakage.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a partial cross-sectional view showing the welded structure of a conventional fuel filter, FIGS. 2 and 3 are partial cross-sectional views and side views of a fuel filter obtained according to the present invention, and FIG. , Figures 5 and 6 are partially enlarged views, Figures 7 and 8 are the cover fittings, Figure 9 is the casing processing jig, and Figure 10 is the casing machining tool.
The figure shows the assembled state when manufactured by pressure welding, and FIG. 11 is a diagram showing the welded state of the welded portion.

1, 1'... Fuel filter, 2, 2'... Cover, 5,
5'...Casing, 7...Outlet pipe tap, 8...
...Outer peripheral inclined wall, 9, 14...Flange part, 18.
...Pressure pick-up tool for cover, 19...Slope surface, 2
2... Pressurized odor control for casing, 25... Upper end surface of cover.

Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 Figure 6 Figure 7 Figure 8 Figure 9 Figure 10 Figure 11

Claims (1)

[Claims] 1. In a fuel filter in which a filter body is disposed in a housing formed by fixing a casing having an inlet pipe and a cover having an outlet pipe, the outlet pipe is oriented horizontally to the upper end surface, and the outlet pipe is located near the upper end surface. A filtration material is fixed to a plastic dish-shaped cover having an outer peripheral inclined wall between a flange portion with a flat lower surface and an upper end surface, and a recessed portion between the outlet pipe attachment portion and the flange portion. , a step of placing the outer circumferential inclined wall of the cover in contact with the inclined surface of a cover jig having an inclined surface having a slope similar to the outer circumferential inclined wall; A plastic cylindrical casing having a flange portion with a flat upper surface and an inclined wall at the base of the flange portion is brought into contact with each flange portion of the cover and casing, and then a casing having an opening with a flat lower surface and an inclined wall. Manufacture of a fuel filter comprising the steps of inserting a pressure jig into the casing and bringing it into contact with the casing flange, and welding the ends of the housing by pressing and vibrating the cover jig and the casing jig. Method.