Straddled vehicle

Patent metadata

Field	Value
Publication number	US-11072234-B2
Application number	US-201916387580-A
Country	US
Kind code	B2
Filing date	Apr 18, 2019
Priority date	Apr 26, 2018
Publication date	Jul 27, 2021
Grant date	Jul 27, 2021

Abstract

A straddled vehicle includes a vehicle body frame supporting a front wheel and a rear wheel, a seat fixed to the vehicle body frame, an engine, a fuel tank, and a canister to adsorb vaporized gas generated by evaporation of a fuel inside the fuel tank. The engine includes a crankshaft that rotates around a crank axis extending in the left-right direction and located lower than the seat. The fuel tank is located farther forward than the seat and higher than the engine. The canister is connected to the fuel tank through a gas pipe. The canister is located farther forward than the crank axis and lower than the fuel tank.

First claim

What is claimed is:

1. A straddled vehicle comprising:
a vehicle body frame that supports a front wheel and a rear wheel;
a seat fixed to the vehicle body frame and on which an occupant sits;
an engine including a crankshaft that rotates around a crank axis extending in the left-right direction and located lower than the seat;
a fuel tank that stores a fuel for the engine, and located farther forward than the seat and higher than the engine;
a canister connected to the fuel tank through a gas pipe, that adsorbs vaporized gas generated by evaporation of the fuel inside the fuel tank, and located farther forward than the crank axis and lower than the fuel tank;
a breather pipe including an inlet connected to the canister and an outlet that opens to the atmosphere;
an intake valve located higher than upper ends of the front wheel and the rear wheel and that opens and closes the outlet, or, an air cleaner located higher than upper ends of the front wheel and the rear wheel and that traps foreign matter from air flowing from the outlet to the inside of the breather pipe; and
a drain pipe located lower than the canister, that branches from the breather pipe and extends downward, and includes a drain hole at a lower end thereof; wherein
the canister is located directly in front of the engine.

2. The straddled vehicle according to claim 1 , further comprising:
a swing arm located farther rearward than the engine and attached to the vehicle body frame in a swingable manner, and to which the rear wheel is attached.

3. The straddled vehicle according to claim 1 , further comprising:
a cover located so as to sandwich the canister with the engine, and that covers at least a portion of the canister from a lateral outer side of the straddled vehicle.

4. The straddled vehicle according to claim 3 , further comprising:
a clip located at a lateral inner side of the straddled vehicle with respect to the cover, and that connects the gas pipe to the canister.

5. The straddled vehicle according to claim 1 , further comprising:
a fuel pump that pumps the fuel out of the fuel tank and supplies the fuel to the engine; and
a shut-off valve integral with the fuel pump, and that shuts the gas pipe off in response to the straddled vehicle tilting at a predetermined angle or more with respect to the vertical direction.

6. The straddled vehicle according to claim 1 , further comprising:
an intake passage including an air inlet and that supplies air from the air inlet to the engine; wherein
the outlet is located at the same height as the air inlet, or located higher than the air inlet.

7. The straddled vehicle according to claim 1 , further comprising:
an exterior component that covers the outlet.

8. The straddled vehicle according to claim 1 , further comprising:
a backflow valve that prevents backflow through the drain hole into the drain pipe.

9. The straddled vehicle according to claim 1 , further comprising:
a throttle body located higher than upper ends of the front wheel and the rear wheel, and connected to the engine;
a purge pipe that connects the canister and the throttle body, and that supplies vaporized gas inside the canister to the throttle body; and
a purge cut valve integral with the throttle body and that opens and closes the purge pipe.

10. The straddled vehicle according to claim 1 , wherein the canister is located at a height lower than an upper end of the engine.

Assignees

• Yamaha Motor Co Ltd

Inventors

• Takata Kazunari
• Miyake Yasuo

Classifications

• B60Y2200/124

  Buggies, Quads · CPC title

• B60K15/063

  Arrangement of tanks · CPC title

• B60K15/03504 Primary

  adapted to avoid loss of fuel or fuel vapour, e.g. with vapour recovery systems · CPC title

• F02M25/0872

  Details of the fuel vapour pipes or conduits · CPC title

• F02M25/0854 Primary

  Details of the absorption canister · CPC title