The present invention relates to a seat rail structure for a motorcycle having a seat rail on a vehicle body. In this structure, the seat rail has a side member being a bent product of continuous fiber reinforced resin, the side member has: a side wall at an outer end in a width direction of a vehicle body; and an upper flange at an upper end of the side wall to protrude from the side wall inward in the width direction, the side wall has an upper fastening portion at an upper end section of a front end region, fastened to a main frame, the upper fastening portion has an upper corner edge portion straddling front edge and upper edge portions, the upper corner edge portion is arcuate, and a rear end of the upper corner edge portion is frontward relative to a front edge portion of the upper flange.

Intake efficiency in an intake system is improved. An intake system takes air through an air inlet duct extending from an air cleaner case, and includes a vortex generator that causes the flow of the intake air inside the air inlet duct to rotate around an axis of the air inlet duct.

Intake efficiency in an intake system is improved. An intake system takes air through an air inlet duct extending from an air cleaner case, and includes a vortex generator that causes the flow of the intake air inside the air inlet duct to rotate around an axis of the air inlet duct.

A method (100) for estimating a volume of fuel available in a fuel tank (6) of a transport vehicle (1), the tank (6) comprising a tank wall inside which a space is defined for containing fuel, the method (100) comprising, in sequence, the steps of: a) exciting (101) a vibration of the tank (6); b) acquiring (102) a response signal correlated to a frequency response produced by the tank (6) due the excited vibration; c) processing (103) the acquired response signal to obtain an estimate of the initial volume of fuel available in the tank (6); d) gradually taking (104) fuel from the tank (6) with the transport vehicle (1) in use; e) estimating (105) a quantity of fuel taken gradually from the tank (6); f) estimating (106) the volume of fuel available in the tank (6) based on the initial volume and quantity estimate of fuel taken gradually.

The present invention relates to a saddle riding vehicle, preferably enduro. The vehicle comprises steering tube to which a steering assembly which controls a front wheel is rotatably connected. Saddle riding vehicle (1) comprises a motor assembly (2) and a frame to which said motor assembly (2) is connected; said vehicle (1) comprises a tank (7) supported by said frame. Such a tank comprises an upper section (71) in a position proximal to said steering tube (11), wherein said upper section (71) comprises two side portions (71A, 71B) spaced apart in the width direction and each of which extends in a position outside a corresponding frame front side. The tank also comprises a central section (72), communicating with the upper section (71), and which extends towards said rear wheel (4) according to the profile of said front part of said frame. The tank (7) further comprises a lower section (73), communicating with said central section (72), which is comprised between the rear sides (18A, 18B) of the frame.

The present invention relates to a saddle riding vehicle, preferably enduro. The vehicle comprises steering tube to which a steering assembly which controls a front wheel is rotatably connected. Saddle riding vehicle (1) comprises a motor assembly (2) and a frame to which said motor assembly (2) is connected; said vehicle (1) comprises a tank (7) supported by said frame. Such a tank comprises an upper section (71) in a position proximal to said steering tube (11), wherein said upper section (71) comprises two side portions (71A, 71B) spaced apart in the width direction and each of which extends in a position outside a corresponding frame front side. The tank also comprises a central section (72), communicating with the upper section (71), and which extends towards said rear wheel (4) according to the profile of said front part of said frame. The tank (7) further comprises a lower section (73), communicating with said central section (72), which is comprised between the rear sides (18A, 18B) of the frame.

Provided is a surface treated steel sheet for a fuel tank, the surface treated steel sheet including: a Zn plated layer or a Zn—Ni alloy plated layer which is formed on at least a surface of the steel sheet to be an inner surface of the fuel tank; and a chromate-free chemical conversion coating layer containing a water-and-oil repellent, the chromate-free chemical conversion coating layer being placed over the Zn plated layer or the Zn—Ni alloy plated layer on the surface to be the inner surface of the fuel tank. A water contact angle on a surface of the chromate-free chemical conversion coating layer is more than or equal to 70 degrees and an n-hexadecane contact angle on the surface of the chromate-free chemical conversion coating layer is more than or equal to 30 degrees and less than or equal to 70 degrees.

A vehicle includes a left front wheel, a right front wheel, and a rear wheel that tilt together with a body frame, wherein, while a large capacity of a fuel tank is ensured, a variation in the center-of-gravity position of the vehicle while driving is small. When viewed in a side view with the body frame in an upright position, the fuel tank is disposed between a first center and a second center, the first center being located between a third center and right and left front wheel ground contacting portions, the second center being located between the third center and a rear wheel ground contacting portion, the third center being located between the right and the left front wheel ground contacting portions and the rear wheel ground contacting portion.

A vehicle includes a left front wheel, a right front wheel, and a rear wheel that tilt together with a body frame, wherein, while a large capacity of a fuel tank is ensured, a variation in the center-of-gravity position of the vehicle while driving is small. When viewed in a side view with the body frame in an upright position, the fuel tank is disposed between a first center and a second center, the first center being located between a third center and right and left front wheel ground contacting portions, the second center being located between the third center and a rear wheel ground contacting portion, the third center being located between the right and the left front wheel ground contacting portions and the rear wheel ground contacting portion.

A vehicle component includes a body having a plurality of layers where each of the plurality of layers is a composite material. The body includes a recess formed in one or more of the plurality of layers. A lighting material is disposed in the recess and includes a tube having a first end and a second end, and a light guide disposed within the tube and extending between the first end and the second end of the tube. A light source is adjacent to one or more of the first end and the second end of the tube. The light source is directed toward the light guide and configured to illuminated the lighting material. The recess is sized to receive the tube.