JP5398466B2 - Fuel cap structure - Google Patents

Description

  The present invention is provided with an oil filler port for supplying fuel to a fuel tank of a vehicle body, a filler pipe in which a screw part is formed on the inner wall on the front end side, and a screw shaft part that is screwed to the screw part, The present invention relates to a fuel cap structure including a fuel cap that opens and closes the fuel filler opening.

  A fuel tank is used to supply fuel to the internal combustion engine. An oil supply pipe (an inlet pipe or a filler pipe) is attached to the fuel tank in order to supply fuel into the fuel tank.

  An oil supply port is provided at the tip of the oil supply pipe, and a cap member (fuel cap) is used to open and close the oil supply port. For example, as shown in FIG. 5, the cap device disclosed in Patent Document 1 includes a filler neck 1 connected to a fuel tank (not shown), and an inlet (fuel supply port) 2 provided at the tip of the filler neck 1. And a fuel cap 3 that can be opened and closed.

  An internal thread portion 4 is formed on the inner wall of the filler neck 1, and the internal thread portion 4 is configured by a convex shape formed in a spiral shape from the inlet 2 toward the back side. The outer wall of the filler neck 1 is provided with a groove-like screw-shaped portion 4 a for forming the female screw portion 4.

  The fuel cap 3 includes a casing 5 attached to the filler neck 1, and a male screw portion 6 is formed on the outer peripheral portion of the casing 5. The male screw portion 6 includes a screw-shaped protrusion (thread) and a screw groove. When the male screw portion 6 is screwed into the female screw portion 4 of the filler neck 1, the fuel cap 3 is fastened to the filler neck 1. Is retained.

Japanese Patent Laid-Open No. 2005-104184

  However, in Patent Document 1 described above, in a state where the fuel cap 3 is fastened to the filler neck 1, the screw-shaped portion 4a formed on the outer wall of the filler neck 1 is easily exposed to the outside. For this reason, there exists a possibility that water may adhere to the screw-shaped part 4a which is groove shape, and water will retain in the said screw-shaped part 4a, and rust will generate | occur | produce. Accordingly, there is a problem that the female screw 4 is easily deformed, and the male screw portion 6 of the fuel cap 3 is difficult to be screwed into the female screw 4.

  The present invention solves this type of problem, and with a simple configuration, water is reliably prevented from staying in the threaded portion on the outer wall side of the threaded portion of the filler pipe, and the detachability of the fuel cap is improved. It is an object of the present invention to provide a fuel cap structure that can be improved.

  The present invention is provided with an oil filler port for supplying fuel to a fuel tank of a vehicle body, a filler pipe in which a screw part is formed on the inner wall on the front end side, and a screw shaft part that is screwed to the screw part, The present invention relates to a fuel cap structure including a fuel cap that opens and closes the fuel filler opening.

  The fuel cap is provided with an outer peripheral cylindrical portion that covers the outer periphery of the screw shaft portion, and when the fuel cap is fastened to the filler pipe, the axial length of the outer peripheral cylindrical portion is a screw shape on the outer wall side of the screw portion. The length is set to cover the part.

  In addition, the fuel cap structure is configured so that one end is fixed to the fuel cap side and the other end is connected to the vehicle body side, and the vehicle body is configured, and the fuel cap is attached to and detached from the filler pipe. A plate-like member in which an opening is formed, and the length of the tether is lower than the plate-like member when the fuel cap is detached from the filler pipe and suspended by its own weight. It is preferable to set the length to be arranged.

  Further, in this fuel cap structure, in a state where the fuel cap is suspended by its own weight, at least a part of the outer peripheral cylindrical portion of the fuel cap is on the inner side in the vehicle width direction from the lower end edge on the inner side in the vehicle width direction of the plate-like member. It is preferable to be arranged so as to protrude.

  In the present invention, when the fuel cap is fastened to the filler pipe, the outer peripheral cylindrical portion of the fuel cap is disposed so as to cover the outer wall side thread-shaped portion of the threaded portion of the filler pipe.

  For this reason, the outer wall side screw shape portion of the screw portion is not directly exposed to the outside, and water can be reliably prevented from staying in the outer wall side screw shape portion. This makes it possible to improve the detachability operability of the fuel cap with a simple configuration.

1 is a schematic configuration diagram of a fuel tank system in which a fuel cap structure according to an embodiment of the present invention is incorporated. It is side surface explanatory drawing of the said fuel cap structure. FIG. 3 is a cross-sectional view of the fuel cap structure taken along line III-III in FIG. 2. It is a partially cutaway enlarged explanatory view of the fuel cap structure. It is explanatory drawing of the cap apparatus currently disclosed by patent document 1. FIG.

  As shown in FIG. 1, a fuel cap structure 10 according to an embodiment of the present invention is incorporated in a fuel tank system 12.

  The fuel tank system 12 includes a fuel tank 14 that stores fuel. One end of a flexible filler tube 16 is connected to the fuel tank 14, and the other end of the filler tube 16 is connected to a filler pipe 18. One end of the blister pipe 20 is provided at the side of the filler pipe 18, while the other end of the blister pipe 20 is opened inside the fuel tank 14.

  The fuel cap structure 10 includes a filler pipe 18 and a fuel cap 24 that opens and closes a fuel filler port 22 of the filler pipe 18. The vehicle body 26 in which the fuel tank system 12 is used includes a plate member 28, and a fuel cap 24 is attached to and detached from the filler pipe 18 from the outside as shown in FIGS. 2 and 3. An opening 30 for operation is formed.

  As shown in FIG. 4, a threaded portion 32 is formed on the inner wall on the distal end side of the filler pipe 18, that is, the inner wall of the filler neck 18 a. The screw portion 32 is formed in a spiral shape inward in the axial direction (arrow A direction) from the open end side where the fuel filler port 22 is provided. The threaded portion 32 is formed by forming a thread groove-shaped outer wall side threaded portion 34 on the outer wall of the filler neck 18a, thereby providing a thread that protrudes toward the inner wall side of the filler neck 18a.

  The fuel cap 24 has a cap portion 38 in which a grip portion 36 is integrally provided. The cap portion 38 is provided with a screw shaft portion 40 that is close to the axial direction, and an outer peripheral cylindrical portion 42 that covers the outer periphery of the screw shaft portion 40. The screw shaft portion 40 has a screw thread 40a that circulates in a spiral shape, and the screw thread 40a is screwed into the screw portion 32 of the filler neck 18a.

  When the fuel cap 24 is fastened to the filler neck 18 a of the filler pipe 18, the axial length H of the outer peripheral cylindrical portion 42 is set to a length that covers at least a part of the outer wall side screw-shaped portion 34 of the screw portion 32. The A gasket 44 is interposed between the inner peripheral surface of the tip of the filler neck 18 a and the cap portion 38 of the fuel cap 24.

  A ring-shaped member 46 is rotatably disposed on the cap portion 38, and one end of a tether 48 is connected to the ring-shaped member 46. The other end of the tether 48 is supported on the vehicle body 26 side. As shown in FIGS. 2 and 3, the tether 48 is arranged so that the fuel cap 24 is disposed below the plate member 28 in a state where the fuel cap 24 is detached from the filler pipe 18 and is suspended by its own weight. The length is set.

  More specifically, in a state where the fuel cap 24 is suspended by its own weight, at least a part of the outer peripheral cylindrical portion 42 of the fuel cap 24, that is, the distal end portion of the outer peripheral cylindrical portion 42 is the vehicle width of the plate-like member 28. It is arranged so as to protrude by a length L on the inner side in the vehicle width direction from the lower end edge portion 28a inside in the direction (arrow B direction in FIG. 3).

  The operation of the fuel cap structure 10 configured as described above will be described below in relation to the fuel tank system 12.

  As shown in FIG. 1, when fuel is supplied into the fuel tank 14, the fuel cap 24 is removed from the filler pipe 18, and the fuel supply port 22 is opened to the outside. A fueling gun (not shown) is inserted into the fueling port 22 and fuel injection from the fueling gun into the filler pipe 18 is started. For this reason, the fuel is supplied from the filler pipe 18 through the filler tube 16 into the fuel tank 14.

  In this case, in this embodiment, as shown in FIG. 4, when the fuel cap 24 is fastened to the filler pipe 18, the outer peripheral cylindrical portion 42 of the fuel cap 24 is formed on the outer wall side screw-shaped portion 34 of the filler pipe 18. It is arranged to cover. For this reason, the filler pipe 18 does not directly expose the outer wall side thread-shaped part 34 having a thread groove shape to the outside, and can reliably prevent water from staying in the outer wall side thread-shaped part 34. it can.

  Therefore, rust does not occur in the outer wall side screw-shaped portion 34, and deformation of the screw portion 32 can be suppressed. Thereby, the effect that the detachability operability of the fuel cap 24 is favorably improved with a simple configuration can be obtained.

  Further, in the present embodiment, as shown in FIGS. 2 and 3, the fuel cap 24 is disposed below the plate-like member 28 in a state where the fuel cap 24 is detached from the filler pipe 18 and is suspended by its own weight. Has been. For this reason, for example, when the fuel cap 24 is suspended by its own weight during refueling, the fuel cap 24 does not come into contact with the plate-like member 28, and it is effectively avoided that the screw thread 40a of the screw shaft portion 40 is damaged. can do.

  Further, as shown in FIG. 3, in the state where the fuel cap 24 hangs down by its own weight, the tip end position of the outer peripheral cylindrical portion 42 of the fuel cap 24 is more than the lower end edge portion 28 a on the inner side in the vehicle width direction of the plate member 28. A length L projects from the inside in the vehicle width direction.

  Therefore, even if water drops from the lower end edge portion 28a of the plate-like member 28, this water does not adhere to the screw shaft portion 40 of the fuel cap 24, and it is possible that water remains attached to the screw thread 40a. Can be blocked. As a result, there is an advantage that it is possible to reliably prevent water from being caused in the filler pipe 18 to cause rust and the deterioration of the screwed state between the fuel cap 24 and the filler pipe 18.

DESCRIPTION OF SYMBOLS 10 ... Fuel cap structure 12 ... Fuel tank system 14 ... Fuel tank 16 ... Filler tube 18 ... Filler pipe 22 ... Filler port 24 ... Fuel cap 26 ... Vehicle body 28 ... Plate-shaped member 30 ... Opening 32 ... Screw part 34 ... Outer wall side Screw-shaped portion 38 ... Cap portion 40 ... Screw shaft portion 40a ... Thread 42 ... Outer cylindrical portion 46 ... Ring-shaped member 48 ... Tether

Claims (2)

A filler pipe in which a fuel filler is provided in the fuel tank of the vehicle body and a screw portion is formed on the inner wall on the front end side, and
A fuel cap that is provided with a screw shaft portion that is screwed to the screw portion, and that opens and closes the fuel filler;
A fuel cap structure comprising:
The fuel cap is provided with an outer peripheral cylinder portion that covers an outer periphery of the screw shaft portion,
When the fuel cap is tightened to the filler pipe, the axial length of the outer peripheral cylindrical portion is set to a length that covers the outer wall side screw-shaped portion of the screw portion ,
Furthermore, one end is fixed to the fuel cap side and the other end is connected to the vehicle body side,
A plate-like member that constitutes the vehicle body and has an opening for attaching and detaching the fuel cap to the filler pipe;
With
The length of the tether, in a state where the fuel cap is suspended by its own weight is removed from the filler pipe, and wherein Rukoto is set to a length of the fuel cap is arranged below the plate-like member Fuel cap structure. 2. The fuel cap structure according to claim 1 , wherein at least a part of an outer peripheral cylindrical portion of the fuel cap is more than the lower end edge on the inner side in the vehicle width direction of the plate member in a state where the fuel cap is suspended by its own weight. A fuel cap structure, wherein the fuel cap structure is arranged to protrude inward in the vehicle width direction.

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