JPH109453A - Rubber hose of fuel tank - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rubber hose by which a seal property can be secured easily without impairing the assembly workability of the rubber hose for the oval shape entrance pipe of a fuel tank. SOLUTION: One side end of the rubber hose 20 of a fuel tank is connected to a pipe connected to the oil supply port of body side surface and its other end is fitted on the outer periphery surface of the entrance pipe of the fuel tank and a ring shape clamp tool is mounted on this fitted part and also the fitted part is tightened by the rotation of the tightening screw. The inner periphery surface 21 of the rubber hose 20 is formed so as to place a smaller lap allowance than the outer periphery surface of the entrance pipe and also a ring shape seal rib 22 press-contacted to the outer periphery surface of the entrance pipe is formed on the inner periphery surface 21 and a positioning projection piece 25 for positioning a clamp tool set on this outer periphery surface is formed on the outer periphery surface 23 of the rubber hose 20.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a fuel tank in which one end is connected to a pipe connected to a filler port on the side of a body, and the other end is fitted to the outer peripheral surface of an inlet pipe of a fuel tank. The present invention relates to a rubber hose of a fuel tank in which a portion is tightened by a clamp.

[0002]

2. Description of the Related Art FIG. 3 shows an assembling structure of a fuel hose of this type. One end of a rubber hose 5 is clamped to an inlet pipe 3 connected to an oil supply port 2 provided with a lid 2a on the side of the body. 4 and the other end is fitted into the inlet pipe 7 of the tank upper 1a of the upper and lower fuel tank 1 and tightened by the circular clamp 10. The inlet pipe 7 is formed in an elliptical shape having a long lateral width so as to increase the cross-sectional shape with respect to the height and width of the tank upper 1a. As shown in FIG. 4, the clamp device 10 has a cylindrical nut 13 attached to one end 11 of a ring-shaped leaf spring band, and a plurality of thread grooves 14 formed in the other end 12. By screwing the tightening screw 15 into the nut 13, the angle is engaged with the screw groove 14, and the tightening position can be adjusted by the rotation position.

[0003]

In such an assembling structure, if the lip allowance of the inner peripheral surface of the rubber hose 5 is made larger with respect to the outer peripheral surface 7a of the inlet pipe 7 in order to improve the sealing property, the fitting is performed. Difficult and therefore the inlet pipe 7
It is also performed to form a loop portion 7b in which the outer diameter of the tip portion is increased. In the case of an elliptical shape, the screw is strongly tightened by the tightening screw 15 so as to be securely tightened even in the short diameter region by the circular clamp 10.

[0004] In view of the above, the present invention provides a rubber hose for a fuel tank that can easily ensure sealing without impairing the workability of attaching the rubber hose to the elliptical inlet pipe of the fuel tank. The purpose is to:

[0005]

According to the present invention, in order to achieve the above object, according to the first aspect of the present invention, one end is connected to a pipe connected to an oil supply port on the side of the body, and the other end is connected to a pipe. Is fitted to the outer peripheral surface of the inlet pipe of the fuel tank, a ring-shaped clamp is attached to the fitting portion, and the rubber hose of the fuel tank is adapted to tighten the fitting portion by rotation of the tightening screw. At the same time, the inner peripheral surface of the rubber hose is formed to be smaller than the outer peripheral surface of the inlet pipe so as to take a wrap margin, and a ring-shaped seal rib is formed on the inner peripheral surface of the rubber hose so as to be pressed against the outer peripheral surface.
A positioning protruding piece for positioning the clamp tool set on the outer peripheral surface is formed.

The sealing ribs are not planar, but are easily bent in the fitting direction to seal linearly, and securely tighten the inlet pipe with an inner diameter smaller than the general surface of the inner peripheral surface of the rubber hose without impairing the assembling workability. I do. The clamp is quickly and reliably set at the fitting position between the positioning projections.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A rubber hose for a fuel tank according to an embodiment of the present invention will be described with reference to FIGS. FIG.
The rubber hose 20 of the present invention, which is used in place of the rubber hose 5, has an inner peripheral surface 21 which forms a slight wrap margin in the end region A on the inlet pipe 7 side corresponding to the elliptical shape as in the related art. Is formed. The opposite end is fitted to the end of the inlet pipe 3 having a circular cross section and is clamped by the clamp band 4. The shape of the inner peripheral surface 21 is the end region A
, Gradually changes toward the circular shape at the opposite end.

A pair of positioning protrusions 25 for positioning both sides in the rubber hose direction are provided in the longer diameter region of the outer peripheral surface 23 in the end region A where the clamp 10 is set.
Are formed in the respective long diameter regions. Three ring-shaped seal ribs 22 having an inner diameter smaller than that of the general surface are formed on the inner peripheral surface 21 in a range between these protruding pieces.

When assembling the rubber hose 20, FIG.
A, as shown in FIG.
Is fitted so as to fit into the concave portion 26 of the inner peripheral surface 21.
At this time, the seal rib 22 is not a face seal but a line seal, and the insertion resistance is also a line. Therefore, the outer peripheral surface 7 of the inlet pipe 7 can be more reliably secured without significantly impairing the assembling workability.
a. Next, the clamp tool 10 previously inserted into the rubber hose 20 is set between the positioning protrusions 25, and tightened by rotating the tightening screw 15. that time,
Since the inlet pipe 7 has an elliptical shape, the clamping tool 10 does not deform accurately corresponding to the shape, so that even if the tightening force is reduced in the short axis region, the sealing rib 2
2, the sealing property can be ensured.

[0010] Instead of the above-described embodiment, the present invention is applied to a fuel tank in which the height of the tank upper 1a is increased and the inlet pipe is formed in a circular shape. it can. The number of seal ribs may be one, for example, in the case of such a circular cross section. The positioning projection may be formed in a loop shape in some cases.

[0011]

According to the first aspect of the present invention, it is possible to improve the sealing performance with a simple structure without significantly affecting the workability of assembling the rubber hose. It is not necessary to apply soapy water, silicon, or the like as in the case where the sealing property is improved by a face seal with a large wrap margin. According to the second aspect of the present invention, even when the inlet pipe has an elliptical shape, the sealing property of the short diameter region can be easily secured, and the set position of the ring-shaped clamp that does not correspond to the elliptical shape is easily and reliably positioned. it can.

[Brief description of the drawings]

FIG. 1 shows a rubber hose according to an embodiment of the present invention. FIG. 1A is a longitudinal sectional view, and FIG. 1B is a transverse sectional view between seal ribs.

FIG. 2 is a partial perspective view of the rubber hose.

FIG. 3 is a side view showing an assembled state of a conventional rubber hose.

FIG. 4 is a partial perspective view of a clamp used for assembling the rubber hose of FIG. 3;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Fuel tank 7 Inlet pipe 10 Clamping tool 15 Tightening screw 20 Rubber hose 21 Inner peripheral surface 22 Seal rib 25 Positioning protrusion

Claims (2)

[Claims] 1. One end is connected to a pipe connected to a fuel supply port on a side surface of a body, and the other end is fitted to an outer peripheral surface of an inlet pipe of a fuel tank. The inner peripheral surface of the rubber hose is formed smaller than the outer peripheral surface of the inlet pipe in the rubber hose of the fuel tank in which the fitting is mounted and the fitting portion is tightened by the rotation of the tightening screw. A ring-shaped sealing rib is formed on the inner peripheral surface of the rubber hose so as to be in pressure contact with the outer peripheral surface, and a positioning protrusion is formed on the outer peripheral surface of the rubber hose to position a clamp tool set on the outer peripheral surface of the rubber hose. Fuel tank rubber hose. 2. An outer peripheral surface of an inlet pipe and an inner peripheral surface of a rubber hose at a fitting portion are formed in an elliptical shape, and positioning protrusions are formed at least in a long diameter region of an outer peripheral surface of the rubber hose. Rubber hose for fuel tank.