Abstract: An exhaust device of a vehicle having a V-engine including a front cylinder and a rear cylinder, includes at least one muffler disposed in a rear part of the vehicle, a front-cylinder exhaust pipe which is connected to a front surface of the front cylinder and which reaches the muffler, and a rear-cylinder exhaust pipe which is connected to a rear surface of the rear cylinder and which reaches the muffler. The front-cylinder exhaust pipe is curved rearward at a curved portion from a connecting portion between the front-cylinder exhaust pipe and the front cylinder inward of the side frame in the lateral direction. The front-cylinder exhaust pipe is located outward in the lateral direction with a fixed space from the engine, and extends toward a rear part of the vehicle substantially along the side frame as viewed from above.

Abstract: A muffler mounting structure of a vehicle, particularly a straddle-type four-wheeled vehicle. The muffler mounting structure is provided with a muffler, at least one muffler mounting portion provided in a body frame and having a mounting hole, and at least one mounted bracket provided in an upper part of the muffler and disposed on an upper surface of the muffler mounting portion. The mounted bracket having a fixing member insertion hole passing in the up and down direction, and at least one fixing member inserted into the fixing member insertion hole from the upper side and fixed to the mounting hole.

Abstract: An exhaust device in which a portion of an exhaust pipe covered by an exhaust pipe cover is rationalized. An exhaust device of a vehicle includes a muffler disposed in a rear part of the vehicle, an exhaust pipe extending from a front surface of a cylinder of an engine to the muffler while passing along an outer side of the engine in a lateral direction, a first exhaust pipe cover covering an entire periphery of an exhaust pipe front portion located near the outer side of the engine in the lateral direction, and a second exhaust pipe cover covering an outer side of an exhaust pipe rear portion located behind the engine.

Abstract: An object of the invention is to provide an exhaust device having a front-cylinder exhaust pipe capable of reducing a heat influence on a cowl located outward in a lateral direction of a side frame.

Abstract: An exhaust device in which a portion of an exhaust pipe covered by an exhaust pipe cover is rationalized. An exhaust device of a vehicle includes a muffler disposed in a rear part of the vehicle, an exhaust pipe extending from a front surface of a cylinder of an engine to the muffler while passing along an outer side of the engine in a lateral direction, a first exhaust pipe cover covering an entire periphery of an exhaust pipe front portion located near the outer side of the engine in the lateral direction, and a second exhaust pipe cover covering an outer side of an exhaust pipe rear portion located behind the engine.

Abstract: The present invention is suitable for a muffler mounting structure of a vehicle, particularly to a straddle-type four-wheeled vehicle. The muffler mounting structure is provided with a muffler, at least one muffler mounting portion provided in a body frame, the muffler mounting portion having a mounting hole, at least one mounted bracket provided in an upper part of the muffler and disposed on an upper surface of the muffler mounting portion, the mounted bracket having a fixing member insertion hole passing in the up and down direction, and at least one fixing member inserted into the fixing member insertion hole from the upper side and fixed to the mounting hole.

Abstract: A metal part in which a base material of silicon-aluminum alloy having 1 to 25% by mass of silicon as an anode is immersed in an electrolyte together with a cathode, and at least a portion of a surface of the base material is anodized and coated with an anodic oxide film. A current density provided to both the anode and the cathode is increased from an initial current density of 0 A/dm2 at a rate between 0.15 and 0.35 A/dm2 per minute, wherein once the current density reaches a prescribed current density of between 0.8 A/dm2 and 1.2 A/dm2, the current density provided to the anode and the cathode is maintained at the prescribed current density.

Abstract: A method of manufacturing a metal part in which a base material of an aluminum alloy as an anode is immersed in an electrolyte together with a cathode, and at least a portion of a surface of the base material is anodized and coated with an anodic oxide film, the method includes: increasing a current density provided to both the anode and the cathode from an initial current density of 0 A/dm2 at a rate that is lower than or equal to 0.35 A/dm2 per minute, wherein once the current density reaches a prescribed current density, the current density provided to the anode and the cathode is maintained at the prescribed current density.

Abstract: To provide a motorcycle exhaust system, which is less susceptible to the elevated temperature of the exhaust gases and vibrations induced by the motorcycle combustion engine (E) and in which the sectional area of the exhaust passage can be properly adjusted independence on the operating condition of the motorcycle combustion engine (E), the motorcycle exhaust system includes a motorcycle combustion engine (E) mounted at a location generally intermediate between front and rear wheels (3 and 9), an exhaust passage fluidly connected at one end with an exhaust port of the motorcycle combustion engine (E), a silencer (17) fluidly connected with the opposite end of the exhaust passage and supported by the motorcycle frame structure (FR) at a location generally above the rear wheel (9); and an exhaust control valve (24) disposed in an inlet of the silencer (17) for variably adjusting the sectional area of the exhaust passage.

Abstract: In an air intake apparatus for a two-wheeled motor vehicle, a body frame of the vehicle includes a hollow head box and a pair of right and left hollow main frames extending rearwards from the right and left sides of the head box. An air intake duct is positioned in front of the head box, a front inlet of an air cleaner positioned behind the head box is connected to a rear outlet of the head box, and an inside of the head box is connected to insides of the mainframes. Preferably, insides of rear edges of the main frames communicate with each other through a hollow cross pipe.

Abstract: In an oil pump apparatus, a drain outlet is positioned outwardly from an inner peripheral surface of a suction passage or from an extended line thereof at a sectional view which takes along an orthogonal direction relative to a central axis of the suction passage and which shows the drain outlet, and/or the drain outlet is positioned at a side of a shaft aperture to be away from an imaginary line connecting a central axis of a discharged passage and a central axis of the suction passage at a sectional view which takes in parallel with the central axis of suction passage and which shows the drain outlet, such that the opening center of the drain outlet is not overlapped on the imaginary line.

Abstract: An air intake apparatus for a two-wheeled motor vehicle. A body frame of the vehicle includes a hollow head box and a pair of right and left hollow main frames extending rearwards from the right and left sides of the head box. An air intake duct is positioned in front of the head box, a front inlet of an air cleaner positioning behind the head box is connected to a rear outlet of the head box, and an inside of the head box is connected to insides of the main frames. Preferably, insides of rear edges of the main frames communicate with each other through a hollow cross pipe.

Abstract: To provide a motorcycle exhaust system, which is less susceptible to the elevated temperature of the exhaust gases and vibrations induced by the motorcycle combustion engine (E) and in which the sectional area of the exhaust passage can be properly adjusted independence on the operating condition of the motorcycle combustion engine (E), the motorcycle exhaust system includes a motorcycle combustion engine (E) mounted at a location generally intermediate between front and rear wheels (3 and 9), an exhaust passage fluidly connected at one end with an exhaust port of the motorcycle combustion engine (E), a silencer (17) fluidly connected with the opposite end of the exhaust passage and supported by the motorcycle frame structure (FR) at a location generally above the rear wheel (9); and an exhaust control valve (24) disposed in an inlet of the silencer (17) for variably adjusting the sectional area of the exhaust passage.

Abstract: In an oil pump apparatus, a drain outlet is positioned outwardly from an inner peripheral surface of a suction passage or from an extended line thereof at a sectional view which takes along an orthogonal direction relative to a central axis of the suction passage and which shows the drain outlet, and/or the drain outlet is positioned at a side of a shaft aperture to be away from an imaginary line connecting a central axis of a discharged passage and a central axis of the suction passage at a sectional view which takes in parallel with the central axis of suction passage and which shows the drain outlet, such that the opening center of the drain outlet is not overlapped on the imaginary line.