JPH05959U - Fuel supply device - Google Patents

Abstract

(57) [Abstract] [Purpose] An improvement of a device for supplying fuel from a fuel tank having a plurality of fuel reservoirs to an engine, which suppresses joint deformation and distortion during welding and is integrated with a stable welded state. The purpose was to obtain a modified shape. A filter incorporating a float valve for switching fuel suction of a fuel tank having a plurality of fuel reservoirs, wherein a portion where a filter casing 2 is installed in a welded portion of a valve casing 1 in which two components are integrated by welding. The connection between the suction pipe and the suction pipe connecting portion 3 is curved toward the center of the valve casing.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an improvement in a device for supplying fuel to an engine from a fuel tank having a plurality of fuel reservoirs.

[0002]

[Prior Art]

 When the fuel tank has a structure with multiple fuel reservoirs, a filter is placed near the bottom of each fuel reservoir, and a suction pipe is used to connect the filters to the fuel on the side close to the suction pump (that is, on the side closer to the engine). When the amount of fuel in the reservoir is low, fuel is supplied from the rear fuel reservoir. At this time, the fuel suction is switched by the filter in the fuel reservoir A near the suction pump side. The internal mechanism can be referred to FIG. 2, but when the float valve 4 is built in the filter casing 2 and the fuel is filled in the tank, the float valve 4 floats to separate the suction pipe from the inside of the tank. Communication, when the fuel decreases, the float valve 4 sits on the valve seat 5 and closes, communicating with the next tank and enabling fuel supply (Actual No. 2-61177).

FIG. 6 is a plan view of a conventional product. The filter is provided by a filter casing 12 onto a valve casing 11 having a float valve seat. In the valve casing, the valve seat 5 and the upper valve casing 11b having the connection portion 13 of the suction pipe are integrally formed on the flat dish-shaped lower valve casing 11a by affixing, and in the case of synthetic resin, the periphery is heat-welded. I am letting you. Welding is partially heated, and distortion occurs until the product cools after welding. Further, in the method of applying a particularly high pressure such as ultrasonic welding, the pressure may cause the welded portion to buckle and the portion to be deformed. Particularly, in the case of a structure having a rectangular shape and a straight line portion as in the conventional product shown in FIGS. 6 and 7, a long straight line portion becomes a problem.

As a countermeasure against the distortion due to partial heating during welding, conventionally, the distortion is suppressed by slowly cooling it over a long period of time, setting it on a shape fixing jig immediately after welding and waiting until the shape stabilizes. It was In addition, as a measure against buckling deformation, the wall thickness has been made sufficiently large to increase rigidity. As a result, there are problems that it takes a lot of time to manufacture, the work becomes complicated, and the shape and weight increase.

[0005]

[Problems to be solved by the device]

 Therefore, we examined the optimum shape when the valve casings are welded and integrated. In other words, the purpose was to suppress the deformation and distortion of the joint during welding and to obtain a stable welded state and integrated shape.

[0006]

[Means for Solving the Problems]

 As a result of studying the above-mentioned problems, a filter having a built-in float valve for switching the fuel suction of a fuel tank having a plurality of fuel reservoirs, and the filter is one of the welded parts of the valve casing 1 having a structure in which two parts are integrated by welding. The above problem is solved by bending the space between the installation portion of the casing 2 and the connection portion 3 of the suction pipe toward the center of the valve casing 1.

[0007]

[Action]

 The straight welded part is curved toward the center of the valve casing to form a constriction, so the rigidity of the welded part increases and distortion and buckling deformation are reduced without increasing the wall thickness, and a stable welded state is integrated. It was possible to obtain a modified shape.

[0008]

【Example】

 Embodiment 1 FIG. 1 is a plan view of the product of the present invention, FIG. 2 is an enlarged view of the AA cross section in FIG. 1, and FIG. 3 is a plan view of only the lower valve casing. This fuel supply device incorporates a circular float valve 4 into a cylindrical filter casing 2 having a circular horizontal section. In FIG. 2, the fuel is reduced and the float valve 4 is seated on the valve seat 5. The closed state is shown. The filter 6 is provided by the filter casing 2 on the valve casing 1 having the valve seat 5 of the float valve 4.

The valve casing 1 includes a flat dish-shaped lower valve casing 1a, and a valve seat 5 and an upper valve casing 1b having a suction pipe, which are integrated with each other. The valve casing 1 needs to have two places, one place where the float valve 4 and the filter casing 2 that covers the float valve 4 are installed, and another place where the connection part 3 for the suction pipe is provided. Conventionally, these two points were connected by a straight line as shown in Fig. 7. However, in the present invention, as shown in FIGS. 1 and 3, a portion between the installation portion of the filter casing 2 and the connection portion 3 of the suction pipe is curved toward the center of the valve casing. That is, the straight line portion of the welded portion 7 of the lower valve casing 1a and the upper valve casing 1b is reduced to form the constricted curved portion 10 as shown in FIG. Since these are made of synthetic resin, the surroundings are integrated by ultrasonic welding. At this time, the presence of the curved portion 10 does not cause distortion or buckling. Details of the cross-sectional shape of the welded portion 7 can be seen in FIGS.

This fuel supply device is also characterized by a fixing structure for the valve casing 1 and the filter casing 2. It is easy to assemble (one-touch), and it can be securely fixed in place, but even after it is fixed, it will not come off with a slight impact. Therefore, the filter casing 2 is provided with locking claws 8a and 8b at positions approximately equal to the circumference thereof, and the valve casing 1 is provided with a locking portion 9 at a corresponding position. One of them is a locking part 9a that does not elastically deform as shown in FIG. 5, and the other two parts are locking parts 9b that elastically deform as shown in FIG. 4, and the former locking part 9a has Engage the claw 8a so that it holds the valve casing inward, and the latter is the locking part 9b that elastically deforms by protruding the arm in an arch shape from the casing body, and insert the claw 8b between the casing body and the arm. I try to match.

With the configuration of the locking portion, the three claws can be engaged almost simultaneously with one touch. Since the locking portion that elastically deforms is provided, even if the relative position of the casing is displaced by some force, the position is restored by the elastic force. Since the claw is held by the casing body and the locking portion 9b composed of the arm-like arm, it cannot be removed, and since it is elastically deformed to absorb the impact from the outside, it was not strong against damage. However, there is a problem even if the position shifts so that the switching valve does not work. Therefore, one portion is used as the non-deformable engaging portion to suppress the amount of deformation appropriately.

[0012]

[Effect of the device]

 In the present invention, since the curved portion is formed with respect to the welded portion of the valve casing, deformation and distortion of the joint portion at the time of welding are suppressed, and a stable welded state and an integrated shape are possible. As a result, manufacturing efficiency has improved and work has become easier. In addition, the reduction of strain that occurs during injection molding of a single item and the dimensional stability are improved. When assembling the cylindrical filter casing to the valve casing, it is now possible to use the positions of the circumference of the filter casing approximately equal to 3 parts, and it is possible to achieve a stable assembled state. Further, the effect of saving the resin material was obtained.

[Brief description of drawings]

FIG. 1 is a plan view of the device.

FIG. 2 is an enlarged cross-sectional view taken along the line AA in FIG.

FIG. 3 is a plan view of only a lower valve casing.

FIG. 4 is an enlarged sectional view of a P part in FIG.

5 is an enlarged cross-sectional view of a Q portion in FIG.

FIG. 6 is a plan view of a conventional product.

FIG. 7 is a plan view of only a lower valve casing of a conventional product.

[Explanation of symbols]

 1 Valve casing 1a Lower valve casing 1b Upper valve casing 2 Filter casing 3 Suction pipe connection part 4 Float valve 7 Welding part 8a Claw 8b Claw 9a Locking part 9b Locking part 10 Bending part

Claims (1)

Claims for utility model registration 1. A filter casing having a built-in float valve for switching the fuel suction of a fuel tank having a plurality of fuel reservoirs, the welding of a valve casing 1 having two parts integrated by welding. Among the parts, a fuel supply device characterized in that a space between the installation part of the filter casing 2 and the connection part 3 of the suction pipe is curved toward the center of the valve casing.