An internal combustion engine with a turbocharger according to an embodiment includes a cylinder block internally including a plurality of cylinders, a cylinder head disposed on top of the cylinder block, and internally including a plurality of exhaust flow passages through which exhaust air discharged from each of the plurality of cylinders flows, and the turbocharger including a rotational shaft, a turbine wheel, and a compressor wheel, the turbine wheel being disposed at one end of the rotational shaft, the compressor wheel being disposed at the other end of the rotational shaft. At least the turbine wheel of the turbocharger is arranged inside the cylinder head. The cylinder head internally includes a plurality of scroll passages for introducing the exhaust air flowing through the plurality of exhaust flow passages to the turbine wheel, the plurality of scroll passages including a first scroll passage for introducing the exhaust air from a first range in a circumferential direction of the turbine wheel to the turbine wheel, and a second scroll passage for introducing the exhaust air from a second range, which is different from the first range in the circumferential direction of the turbine wheel, to the turbine wheel.

A supercharger includes a main housing, a front cover coupled to the main housing and having an inner portion received within the main housing, a drive coupling assembly arranged between an input shaft and a rotor shaft, and a coupling sleeve disposed about the drive coupling.

A supercharger includes a main housing, a front cover coupled to the main housing and having an inner portion received within the main housing, a drive coupling assembly arranged between an input shaft and a rotor shaft, and a coupling sleeve disposed about the drive coupling.

An engine device 1 includes: an exhaust manifold 4 disposed on one of left and right sides of a cylinder head 2, and an intake manifold 3 disposed on the other of the left and right sides of the cylinder head 2; and a turbocharger 30 that uses fluid energy of an exhaust gas discharged from the exhaust manifold 4, to compress fresh air to be flowed into the intake manifold 3. The turbocharger 30 is constituted by a two-stage turbocharger including a high-pressure turbocharger 51 coupled to the exhaust manifold 4 and a low-pressure turbocharger 52 coupled to the high-pressure turbocharger 51. The high-pressure turbocharger 51 is disposed on one of left and right lateral sides of the exhaust manifold 4, while the low-pressure turbocharger 52 is disposed above the exhaust manifold 4.

A conduit connection assembly includes a first conduit component having a first mating structure and a second conduit component having a second mating structure adapted to be mated with the first mating structure. A sealing arrangement is provided for sealing between the mating structures. The sealing arrangement includes at least two spaced sealing members defining an intermediate space and the assembly includes a pressure relief opening arranged in communication with the intermediate space between the two spaced sealing members.

A connection passage 63 is provided to connect an exhaust emission control catalyst and the particulate collection filter to each other, and partially has a small cross-sectional area portion 632 the flow passage cross-sectional area of which is smaller than an area of the transverse section of the particulate collection filter. The enlarged portion 633 having a flow passage cross-sectional area enlarged to be approximately as large as the area of the transverse section of the particulate collection filter is formed at the connection portion with the particulate collection filter in the connection passage 63, and the guide wall portion 634 is provided in the enlarged portion 633 to allow the exhaust gas having passed through the small cross-sectional area portion 632 to swirl along the peripheral wall of the enlarged portion 633.

A connection passage 63 is provided to connect an exhaust emission control catalyst and the particulate collection filter to each other, and partially has a small cross-sectional area portion 632 the flow passage cross-sectional area of which is smaller than an area of the transverse section of the particulate collection filter. The enlarged portion 633 having a flow passage cross-sectional area enlarged to be approximately as large as the area of the transverse section of the particulate collection filter is formed at the connection portion with the particulate collection filter in the connection passage 63, and the guide wall portion 634 is provided in the enlarged portion 633 to allow the exhaust gas having passed through the small cross-sectional area portion 632 to swirl along the peripheral wall of the enlarged portion 633.

A straddle-type vehicle comprises a supercharging device which compresses intake-air to be sent to a combustion chamber of an engine; a catalyst provided in an exhaust passage through which an exhaust gas emitted from the engine flows; and a control section which controls the engine, wherein the control section performs an increase suppressing control for suppressing an increase in an exhaust gas temperature, in a case where the control section estimates that the exhaust gas temperature has exceeded an increase suppressing temperature set to be equal to or lower than a catalyst permissible temperature.

An engine includes an intake electric S-VT configured to change a rotational phase of an intake camshaft, an exhaust electric S-VT configured to change a rotational phase of an exhaust camshaft, a fuel pump, and a supercharger driven by the engine. Both the fuel pump and the supercharger are driven by power transmitted from a crankshaft. The power is transmitted to the fuel pump via a first drive mechanism, and the power is transmitted to the supercharger via a second drive mechanism whose system is different from a system of the first drive mechanism.

Disclosed is an engine which comprises: an engine body comprising a cylinder head and a cylinder block; an inlet duct attached to the engine body; and a fuel system component disposed between the engine body and the inlet duct, wherein the inlet duct is disposed on a vehicle forward side of the engine body when mounted to a vehicle, and wherein the inlet duct has: a fuel system component-corresponding portion located in a zone overlapping the fuel system component when viewed from the vehicle forward side, and a region located adjacent to the fuel system component-corresponding portion and having a lower rigidity than the fuel system component-corresponding portion.