JPH048633A - Drain hose connecting structure - Google Patents

Abstract

PURPOSE:To have connection simply by forming a cylindrical coupling part interposed between a drain hose and a joint protruding from an exhaust hole to the drain hose side in a consolidated structure, and thereby preventing certainly fuel leakage from the drain hose connection part without using adhesives. CONSTITUTION:Detent boss 13a formed in a single piece with the top periphery of a joint 13 is contacted with the inside surface of the body 5 of a shield 4, and thereby the joint 13 is detained being prevented from slipping off downward. In the condition that a drain hose 11 is connected with the shield 4, eventually leaked fuel at an inlet pipe 8 by mistake when the fuel is poured in will flow down as creeping on the body 5 or the seal lip 7 of shield 4, to be gathered at the exhaust hole 9 and exhausted to outside the car through the hose 11. The leak fuel at the time passes through a gap formed between the coupling part 10 and joint 13 or the internal surface of the joint 13, but because the hose 11 is fitted on the periphery with the coupling part 10 interposed, the leak fuel will never go out from the junction of hose 11.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a drain hose connection structure for discharging fuel leaked from an inlet pipe to the outside of a vehicle when fuel is injected into the vehicle.

[Prior Art] Conventionally, as a structure of a fuel injection part of an automobile, there is one disclosed in, for example, Japanese Utility Model Publication No. 58-45139.
This technique has the problem that not only is the structure for attaching the packing to the filler pipe complicated, but also the sealing performance between the two is insufficient.

Therefore, as shown in FIGS. 3 and 4, the outer end (right end in the figure) of the inlet pipe 51 into which fuel is injected is supported under pressure by the annular seal lip 53 of the rubber shield body 52. There is something I did. In this technique, a discharge port 54 is provided below the seal lip portion 53 of the shield body 52 for guiding fuel leaked from the inlet pipe 51 during fuel injection to the outside of the vehicle.

A cylindrical joint 55 made of hard resin is inserted into and supported by the discharge port 54 .

A drain hose 56 having an inner diameter that is approximately the same as the outer diameter of the joint 55 is placed over the joint 55 and secured by a clamp 57 .

In the configuration in which the drain hose 56 is connected to the joint 55 as described above, the drain hose 56 is sometimes assembled to the joint 55 in an attitude different from a predetermined attitude (inclination), When driving the vehicle, vibrations of the drain hose 56 are transmitted to the joint 55. Then, a gap is created between the joint 55 and the shield body 52 due to the vibration of the drain hose 56, and leaked fuel may enter the indoor side through the gap. Therefore, conventionally, the head 55a of the joint 55 is adhesively fixed to the discharge port 54 using an instant adhesive or the like.

[Problems to be Solved by the Invention] However, in the conventional connection structure of the drain hose 56, it is very troublesome to apply adhesive so that there is no gap between the joint 55 and the shield body 52. However, there is a problem in that the number of manufacturing steps increases due to the adhesive application work.

Further, in addition to the fact that the outer diameter of the joint 55 and the inner diameter of the drain hose 56 are almost the same, the joint 55
Since it is made of hard resin and cannot be elastically deformed,
There was also the problem that it was difficult to cover the joint 55 with the drain hose 56.

The present invention has been made in view of the above-mentioned circumstances, and its purpose is to reliably prevent leakage of fuel from the connection part of the drain hose without using an adhesive.
To provide a drain hose connection structure which not only can reduce manufacturing man-hours by the omission of adhesive application work but also connects the drain hose to a shield body with simple work.

[Means for Solving the Problems] Therefore, in order to achieve the above object, the present invention supports the outer end of the inlet pipe into which fuel is injected in a pressure-contact state by the annular seal lip of the shield body. In a drain hose connection structure in which a cylindrical joint is inserted and supported through a discharge port formed below the seal lip part, and a drain hose is externally fitted and fixed to the joint, the drain hose is connected to the shield body from the discharge port. protrudes toward the side,
The gist of the present invention is a drain hose connection structure in which a cylindrical connecting portion interposed between the joint and the drain hose is integrally formed.

[Function] When the drain hose is connected to the shield body, even if fuel accidentally leaks from the inlet pipe during fuel injection, the fuel will flow along the shield body and be collected at the discharge port, where it will be discharged from there. be discharged. At this time, the leaked fuel passes through the inner peripheral surface of the joint or the gap between the joint and the connecting part, but in either case, the drain hose is fitted around the outer periphery of the connecting part, so the leaked fuel passes through the joint and the connecting part. There is no leakage from the drain hose connection.

In addition, when assembling the drain hose, there are times when the drain hose is placed over the connecting part in a different position than the predetermined position, or even if the drain hose vibrates while driving the car, the drain hose may be attached to the shield body. The connecting portion elastically deforms following the movement of the drain hose. Therefore, there is no gap between the shield body and the drain hose.

When connecting a drain hose to the shield body, for example, the drain hose is placed over the connecting portion without inserting the joint. At this time, since the shape of the connecting portion is not held by the joint, it is possible to easily cover the drain hose while elastically deforming the connecting portion. Next, insert the joint from the discharge port into the connection part covered with the drain hose. Then, the drain hose is integrally connected to the connecting portion and the joint. Therefore, there is no need to apply an adhesive to prevent a gap between the joint and the shield body.

[Example] An example embodying the present invention will be described below with reference to FIGS. 1 and 2.

Fig. 1 is a partial sectional view showing the connection structure of the drain hose, and Fig. 2 is an exploded sectional view of the main part thereof.A fuel injection recess 2 is formed on the rear side of the automobile, and this recess 2 can be opened and closed. Covered by a cover (not shown). Recess 2
A through hole 3 is formed in the inner bottom surface 2a, and a rubber shield body 4 is attached to the through hole 3.

The shield body 4 includes a cylindrical main body 5 inserted into the through hole 3, a flange 6 integrally formed on the outer periphery of the outer end (right end in the figure), and an inner end of the main body 5. The flange 6 is fixed to the inner bottom surface 2a of the recess 2 by screws or the like. The seal lip portion 7 has a cylindrical shape whose diameter decreases on the outside, and the outer end portion is formed to have a thicker circular cross section than the other portions. An inlet pipe 8 is inserted into the seal lip 7, and the outer end 7a of the seal lip 7 is pressed against the outer peripheral surface of the inlet pipe 8. In addition,
The outer end opening of the inlet pipe 8 constitutes a fuel inlet, and this fuel inlet is closed by a cap 14.

A discharge port 9 is provided below the seal lip portion 7 in the shield body 4 for guiding fuel leaking from the inlet pipe 8 to the outside of the vehicle. Further, a cylindrical connecting portion 10 that projects diagonally downward from the discharge port 9 is integrally formed on the main body portion 5 of the shield body 4.

The protruding length of this connecting part 10 is 20 to 30 degrees.

A drain hose 11 made of vinyl chloride resin is attached to the connecting portion 10.
The upper end of the holder is fitted onto the outside, and the clamp 12 is used to securely tighten the holder. The lower end of this drain hose 11 extends outside the vehicle. Further, a joint 13 for maintaining the shape of the connecting portion 10 is fitted into the connecting portion 10 from the outlet 9. The joint 13 is made of a hard resin such as polyamide resin and is formed into a cylindrical shape having approximately the same length as the connecting portion 10. The joint 13 is locked so that it cannot be pulled out downward by a locking protrusion 13a integrally formed on the outer periphery of the upper end coming into contact with the inner peripheral surface of the main body 5 of the shield body 4. .

With the drain hose 11 connected to the shield body 4 as described above, even if fuel accidentally leaks from the inlet pipe 8 during fuel injection, the leaked fuel will be absorbed by the seal lip 7 of the shield body 4 or the like. Flows down along the main body part 5,
It is collected at the discharge port 9, passes through the drain hose 11, and is discharged outside the vehicle. At this time, the leaked fuel is leaked from the inner peripheral surface of the joint 13 or between the joint 13 and the connecting portion 1.
0, but in either case, the connecting part 10
Since the drain hose 11 is fitted around the outer periphery of the drain hose 11, the leaked fuel will not leak out from the connecting portion of the drain hose 11.

In addition, when assembling the drain hose 11, the drain hose 11 may sometimes move if it is placed over the connecting part 10 in a different posture than the predetermined one, or if the drain hose 11 vibrates while driving the car. The connecting portion 10 also follows this and elastically deforms.

Therefore, unlike the conventional technology in which a gap is created between the joint 55 and the shield body 52 and leaked fuel may enter the indoor side through the gap, in this embodiment, such a gap does not occur. It is possible to reliably prevent leaked fuel from entering the inside of the vehicle.

By the way, when connecting the drain hose 11 to the shield body 4, first, with the clamp 12 attached to the drain hose 11, the drain hose 11 is placed over the connecting portion IO. At this time, the joint 13 is not fitted into the connecting portion 10, and the shape of the connecting portion IO is not maintained by the joint 13. Therefore, unlike the prior art in which the drain hose 56 is directly waved around the joint 55, in this embodiment, the drain hose 11 can be easily placed over the connecting portion 10 while elastically deforming it.

Next, the joint 13 is pushed into the connecting part 10 covered with the drain hose 11 from above the discharge port 9 against the elastic force of the connecting part 10. And finally, clamp 12
When tightened, the drain hose 11 is connected to the connecting portion 10 and the joint 13 in a manner that cannot be removed. Therefore, in this embodiment, there is no need to apply an adhesive to prevent a gap from forming between the joint 55 and the shield body 52, as in the conventional case, and the amount of time required is the omission of this troublesome adhesive application operation. Manufacturing man-hours can be reduced.

[Effects of the Invention] As detailed above, according to the present invention, it is possible to reliably prevent leakage of fuel from the connection part of the drain hose without using an adhesive, and it is possible to reduce the number of manufacturing steps. Instead, it is possible to connect the drain hose to the shield body with a simple operation.

[Brief explanation of drawings]

Figures 1 and 2 show an embodiment embodying the present invention.
The figure is a partial sectional view showing the connection structure of the drain hose.
The figure is an exploded sectional view of the main part, Figures 3 and 4 show the conventional technology, and Figure 3 is a partial sectional view showing the connection structure of the drain hose.
FIG. 4 is an exploded sectional view thereof. 4...Shield body, 7...Seal lip part, 8...
・Inlet pipe, 9...Discharge port, 10...Connection part, 11...Drain hose, 13...Joint. Patent applicant: Toyoda Gosei Co., Ltd. Agent: Patent attorney: Hironobu Onda (and 1 other person) 4th session

Claims (1)

[Claims] 1. The outer end of the inlet pipe (8) into which fuel is injected is supported under pressure by the annular seal lip (7) of the shield body (4), and a A cylindrical joint (13) is inserted and supported through the discharge port (9), and a drain hose (11) is inserted into the joint (13).
), in which the shield body (4) protrudes from the discharge port (9) toward the drain hose (11), and the joint (13) and the drain hose ( 11) A drain hose connection structure characterized in that a cylindrical connection part (10) interposed between the drain hose and the drain hose is integrally formed.