Connector for fuel tank and check valve

1. A connector for a fuel tank, comprising:

a cylindrical main body having an outer surface, a holding end portion at one end thereof, an assembling portion on one side thereof, and a wall portion projecting outwardly from the outer surface and extending toward the holding end portion to form a space between the outer surface and the wall portion, said wall portion being integrally formed with the main body as one unit and having therein a plurality of holes spaced apart from each other and a length less than a length between the holding end portion and a portion where the wall portion is integrally fixed to the main body;

a connecting cylinder body having an attachment portion of a pipe which connects a fuel tank and an external portion, an assembled portion formed at one side thereof and extending beyond the attachment portion, said assembled portion being assembled with the assembling portion of the cylindrical main body and having engaging projections projecting outwardly from an outer surface thereof, a stopper portion formed on an inside thereof at a side opposite to the assembled portion, and a smooth inner surface extending from a portion adjacent to the stopper portion to the assembled portion; and

a reinforcing cylinder body housed inside the connecting cylinder body,

wherein when assembling the cylindrical main body and the connecting cylinder body, the assembling portion is disposed in the assembled portion, the assembled portion is disposed in the space between the outer surface and the wall portion, and the engaging projections engage the holes, and

the reinforcing cylinder body is sandwiched from both sides by the stopper portion and the holding end portion so that the reinforcing cylinder body is positioned on an inside of the attachment portion of the connecting cylinder body.

2. A connector for a fuel tank according to claim 1 , wherein the cylindrical main body includes a valve body which closes a flow channel of the cylindrical main body to be openable, or is capable of closing the flow channel of the cylindrical main body.

3. A connector for a fuel tank according to claim 1 , wherein said connecting cylinder body is made of synthetic resin, and the reinforcing cylinder body made of a material having rigidity greater than that of the connecting cylinder body.

4. A connector for a fuel tank according to claim 3 , wherein the connecting cylinder body includes, as the attachment portion, a flange portion projecting outwardly from the outer surface thereof, said assembling portion being disposed in the assembled portion such that the holding end portion is located at about an upper surface of the flange.

5. A connector for a fuel tank according to claim 4 , wherein said wall portion includes slits to partially separate an upper part thereof.

6. A connector for a fuel tank according to claim 1 , wherein the assembling portion is disposed inside the connecting cylinder body such that the holding end portion is located at about a surface of the attachment portion opposite of the stopper portion, to support the reinforcing cylinder body.

7. A connector for a fuel tank according to claim 6 , wherein the reinforcing cylinder body has an external diameter substantially equal to an internal diameter of the connecting cylinder body throughout an entire length thereof, and an internal diameter of the assembling portion is substantially equal to an internal diameter of the reinforcing cylinder body.

8. A connector for a fuel tank according to claim 1 , wherein the space is defined between the assembling portion and the wall portion.

9. A fuel tank check valve, comprising:

a cylindrical main body having an outer surface, a holding end portion at one end thereof, an assembling portion on one side thereof, a valve body on another side, and a wall portion projecting outwardly from the outer surface and extending toward the holding end portion to form a space between the outer surface and the wall portion, said wall portion being integrally formed with the main body as one unit and having therein a plurality of holes spaced apart from each other and a length less than a length between the holding end portion and a portion where the wall portion is integrally fixed to the main body;

a connecting cylinder body having an attachment portion of a fuel supply pipe, an assembled portion formed at one side thereof and extending beyond the attachment portion, said assembled portion being assembled with the assembling portion of the cylindrical main body and having engaging projections projecting outwardly from an outer surface thereof, and a stopper portion formed on an inside thereof at a side opposite to the assembled portion, and a smooth inner surface extending from a portion adjacent to the stopper portion to the assembled portion; and

a reinforcing cylinder body housed inside the connecting cylinder body,

wherein when assembling the cylindrical main body and the connecting cylinder body, the assembling portion is disposed in the assembled portion, the assembled portion is disposed in the space between the outer surface and the wall portion, and the engaging projections engage the holes, and

the reinforcing cylinder body is sandwiched from both sides by the stopper portion and the holding end portion so that the reinforcing cylinder body is positioned on an inside of the attachment portion of the connecting cylinder body.

10. A fuel tank check valve according to claim 9 , wherein an internal diameter of the assembling portion and an internal diameter of the reinforcing cylinder body are approximately equal.

11. A fuel tank check valve, comprising:

a cylindrical main body having an outer surface, an assembling portion on one side thereof with a holding end portion, a valve body on another side, and a wall portion projecting outwardly from the outer surface and extending toward the one side to form a space between the outer surface and the wall portion, said wall portion being integrally formed with the main body as one unit and having therein a plurality of holes spaced apart from each other;

a connecting cylinder body having an attachment portion of a fuel supply pipe, an assembled portion assembled with the assembling portion of the cylindrical main body and having engaging projections projecting outwardly from an outer surface thereof, and a stopper portion formed on an inside thereof;

a reinforcing cylinder body housed inside the connecting cylinder body; and

projections protruding toward a center of the cylindrical main body formed in the assembling portion of the cylindrical main body to support the reinforcing cylinder body,

wherein when assembling the cylindrical main body and the connecting cylinder body, the assembling portion is disposed in the assembled portion, the assembled portion is disposed in the space between the outer surface and the wall portion, and the engaging projections engage the holes, and

the reinforcing cylinder body is sandwiched from both sides by the stopper portion and the holding end portion so that the reinforcing cylinder body is positioned on an inside of the attachment portion of the connecting cylinder body.