An air intake duct of a motorcycle forms an air intake passage for supplying an intake air to a supercharger. The air intake duct forms a curve portion and is connected to the supercharger. The air intake passage has a transverse cross-section which is shaped such that a dimension in an orthogonal direction that is orthogonal to a radial direction of the curve portion is gradually reduced from the center of the curve portion toward an outer side, in the radial direction, of the curve portion.

An air intake duct of a motorcycle forms an air intake passage for supplying an intake air to a supercharger. The air intake duct forms a curve portion and is connected to the supercharger. The air intake passage has a transverse cross-section which is shaped such that a dimension in an orthogonal direction that is orthogonal to a radial direction of the curve portion is gradually reduced from the center of the curve portion toward an outer side, in the radial direction, of the curve portion.

A saddle-ridden vehicle includes: an engine; a clutch which enables or disables motive power transmission between a crankshaft provided in the engine and a transmission mechanism; a turbocharger which compresses air for burning to be supplied to the engine; and a throttle device which adjusts a rate of air supply to the engine by controlling an opening angle of a throttle valve using a drive motor, the turbocharger includes a turbine unit which is driven by exhaust gas of the engine and a compressor unit which compresses air receiving drive force of the turbine unit; the clutch is disposed at one side, in a vehicle width direction, of the engine; and the compressor unit and the drive motor are disposed at other side of the engine in the vehicle width direction.

A saddle-ridden vehicle includes: an engine; a clutch which enables or disables motive power transmission between a crankshaft provided in the engine and a transmission mechanism; a turbocharger which compresses air for burning to be supplied to the engine; and a throttle device which adjusts a rate of air supply to the engine by controlling an opening angle of a throttle valve using a drive motor, the turbocharger includes a turbine unit which is driven by exhaust gas of the engine and a compressor unit which compresses air receiving drive force of the turbine unit; the clutch is disposed at one side, in a vehicle width direction, of the engine; and the compressor unit and the drive motor are disposed at other side of the engine in the vehicle width direction.

This supercharger for a motorcycle is driven by power of a crankshaft of a combustion engine, and compresses intake air to be supplied to the combustion engine. The supercharger has an impeller of a centrifugal type, and an intake air control valve is disposed on the upstream side of the impeller of the supercharger with respect to a flow direction of the intake air. The intake air control valve is disposed so as to face a suction port of the supercharger in the flow direction of the intake air. The intake air control valve adjusts the amount of the intake air flowing into the impeller, and in addition, provides a preswirl to the intake air flowing into the impeller.

This supercharger for a motorcycle is driven by power of a crankshaft of a combustion engine, and compresses intake air to be supplied to the combustion engine. The supercharger has an impeller of a centrifugal type, and an intake air control valve is disposed on the upstream side of the impeller of the supercharger with respect to a flow direction of the intake air. The intake air control valve is disposed so as to face a suction port of the supercharger in the flow direction of the intake air. The intake air control valve adjusts the amount of the intake air flowing into the impeller, and in addition, provides a preswirl to the intake air flowing into the impeller.

Illustrative embodiments of vaned diffusers of radial compressors and exhaust turbochargers comprising the same are disclosed. In some illustrative embodiments, angular spacings between guide vanes of the diffuser which are arranged adjacent to one another may vary along the circumference, allowing resonant vibration of the compressor to be reduced. In addition, the narrowest cross-sectional area between in guide vanes can be held constant, allowing an increased efficiency and a positive effect on the surge margin.

Illustrative embodiments of vaned diffusers of radial compressors and exhaust turbochargers comprising the same are disclosed. In some illustrative embodiments, angular spacings between guide vanes of the diffuser which are arranged adjacent to one another may vary along the circumference, allowing resonant vibration of the compressor to be reduced. In addition, the narrowest cross-sectional area between in guide vanes can be held constant, allowing an increased efficiency and a positive effect on the surge margin.

A diffuser for a radial compressor of a turbomachine is provided. The diffuser has a plurality of diffuser channels, wherein the diffuser channels extend across a radial area of the diffuser across a bent area into an axial area of the diffuser, wherein, in the radial area of the diffuser, the diffuser channels have diffuser walls in particular at v-shaped blades that are bent in the movement direction of the radial compressor or are straight.

A diffuser for a radial compressor of a turbomachine is provided. The diffuser has a plurality of diffuser channels, wherein the diffuser channels extend across a radial area of the diffuser across a bent area into an axial area of the diffuser, wherein, in the radial area of the diffuser, the diffuser channels have diffuser walls in particular at v-shaped blades that are bent in the movement direction of the radial compressor or are straight.