JPH079638U - Fuel tank fuel removal device - Google Patents

Abstract

(57) [Summary] [Purpose] To improve the workability of the float, which is the valve body of the fuel take-out device, and the reliability during operation. [Structure] The float 3 of the valve body that opens and closes the suction port is composed of a cylinder 31 having an open upper surface or a lower surface and a disk 32.
Are formed on the outer peripheral edge 38 of the disk.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a fuel tank fuel tank fuel supply device for supplying fuel to an engine.

[0002]

[Prior art]

 Conventionally, a float is widely used as a valve element of a suction port in a fuel take-out device for a fuel tank. Usually, this float is surrounded by a float guide and its movement direction is fixed, and the size of the gap between this float and the float guide determines the mobility and response speed of the float.

When the gap is too large, the mobility of the float is deteriorated by rattling in the float guide, and when it is too small, the friction with the float guide is too large and the response speed of the float is slowed down. Therefore, in designing, the optimum value is determined by performing sufficient theoretical calculation, but even if processing is performed according to the optimum value, the motility and response speed of the float are still slightly impaired. Is.

[0004]

[Problems to be solved by the device]

 For example, taking a typical float made by ultrasonic welding of an open bottom cylinder and a bottom lid disk, as shown in FIGS. 6 and 7, burrs generated at the welded portion affect the mobility of the float. Therefore, it is usually necessary to remove the burr. In the worst case, the edge-like end exposed due to welding deviation is caught on the float guide and impedes the mobility of the float. Such problems occur.

With respect to the processing method, it is practical to use the above-mentioned ultrasonic welding or the like in consideration of the material and the cost. Therefore, we decided to study the shape of the joint surface between the cylinder and the disk so that the size of the gap as designed can be easily achieved even with such conventional processing methods.

[0006]

[Means for Solving the Problems]

 As a result, the float 3 of the valve body that opens and closes the suction port is composed of a cylinder 31 and a disk 32 whose upper surface or lower surface is opened, and this disk 32 has a ridge 36 which is slightly larger in diameter than the cylindrical side surface 37. We devised a fuel take-out device for a fuel tank, characterized in that the outer peripheral edge 38 of the disk is formed.

[0007]

[Action]

 For example, in the case of the float 3 using the cylinder 31 whose lower surface is opened, the cylindrical side surface 37 and the disk outer peripheral edge 38 become a smooth continuous surface if they are joined as designed. This continuous surface is equidistant from any of the float guides, and the ridges 36 are steps formed on the continuous surface and having a substantially cross-sectional convex shape. For this reason, the ridge 36 comes into sliding contact with the float guide, and the friction is extremely small.

Even if an edge portion or a burr is exposed or formed on the joint surface between the cylinder 31 and the disk 32 due to processing, the protrusion 36 makes contact with the float guide and floats. Does not interfere with the motility of. Also, the step width between the tip of the ridge 36 and the cylindrical side surface 37 absorbs this error even if the cylinder 31 and the disk 32 are misaligned during joining, and maintains the continuity from the cylindrical side surface 37 to the disk outer peripheral edge 38. Let

[0009]

【Example】

 An embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a vertical cross-sectional view of a fuel tank using an embodiment of a fuel take-out device using a float of the present invention, FIG. Fig. 4 is the same plan view, and Fig. 4 is an enlarged cross-sectional view taken along the arrow A in Fig. 2 of the joining surface between the float cylinder and disk of the present invention. FIG. 5 is an enlarged cross-sectional view of a main part corresponding to FIG.

As shown in FIGS. 1 to 3, the fuel take-out device comprises a case 4 composed of a float chamber 5, a sub-chamber 6 and a chamber 7, and a cylindrical side 37 is attached to a float guide 52 in the float chamber 5. The float 3 is housed so that it can be brought into sliding contact. This fuel take-out device sucks the fuel in the fuel tank 8 from the mesh 51 of the float chamber 5 or the fuel suction pipe 62 and sends it from the chamber 7 to the engine through the fuel supply pipe 72.

As shown in FIGS. 2 to 5, the float 3 of the present invention adopted in the above-mentioned fuel take-out device comprises a cylinder 31 having an open lower surface and a disk 32 having a ridge 36 formed on the outer peripheral edge thereof. The fuel extraction device of this embodiment employs a double float valve structure in which the disc 32 and the sub valve portion 1 are integrally formed and the sub valve portion 1 and the main valve portion 2 are interlocked.

In both floats 3, a synthetic resin cylinder 31 and a disk 32 are joined by ultrasonic welding. The welding joining surface 33 has a sectional structure as shown in FIG. 4 or FIG. 5, and the upper surface of the disk 32 provided with the fitting ring 35 is fitted to the inner surface of the lower end of the cylinder 31 having the step 34. It has melted down. According to the design calculation, the step 34 and the fitting ring 35 are in close contact with each other, and as shown in FIG. 4, the protrusion 36 of the outer peripheral edge 38 of the disk protrudes from the cylindrical side surface 37 by that amount, and there is no clearance with the float guide 52. Open the space a.

However, in actuality, the cylinder 31 and the disk 32 may be joined with a slight deviation from each other due to processing accuracy. As shown in FIG. 5, even if the cylindrical side surface 37 and the disk outer peripheral edge 38 are slightly displaced and the continuity is lost, the ridge 36 relaxes this displacement and leaves a gap a with the float guide. It is possible to achieve continuity of the outer peripheral edge 38 of the disk from the side surface 37 of the cylinder which is not caught.

[0014]

[Effect of device]

 By improving the float structure, the fuel extraction device of the present invention can improve the reliability of the operation even when the processing accuracy is relaxed because the productivity is improved. In other words, the ease of processing accuracy tolerance of each component and the ease of float assembly are combined to improve the convenience of the work as a whole.

Further, as compared with the prior art, the allowance of the coupling accuracy of each part can be made wider, so that even if there is a step, the float guide does not get caught, so that the movement of the float is guaranteed. The reliability of the fuel extraction device is also improved.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of a fuel tank.

FIG. 2 is a vertical cross-sectional view of a fuel extraction device using the float of the present invention.

FIG. 3 is a plan view of the same.

FIG. 4 is an enlarged sectional view taken along arrow A in FIG.

FIG. 5 is an enlarged cross-sectional view of a main part of a joint surface of a float in which a cylinder and a disc are displaced from each other.

FIG. 6 is an enlarged cross-sectional view of a main part of a bonding surface of a conventional float.

FIG. 7 is an enlarged cross-sectional view of a main part of a joint surface of a conventional float in which a cylinder and a disc are displaced from each other.

[Explanation of symbols]

 3 Float 31 Cylindrical 32 Disk 33 Joining surface 34 Step 35 Fitting ring 36 Convex ridge 37 Cylindrical side surface 38 Disk outer peripheral edge a Set clearance

Claims (1)

[Scope of utility model registration request] 1. A float 3 of a valve body for opening and closing a suction port comprises a cylinder 31 having an open upper surface or a lower surface and a disk 32, and the disk has a diameter slightly larger than a cylindrical side surface 37.
A fuel take-out device for a fuel tank, wherein 36 is formed on the outer peripheral edge 38 of the disk.