A straddled vehicle having an engine unit. The engine unit includes an engine body having a cylinder axis tilting forward, a radiator including a radiator core, a turbocharger including a turbine wheel and a compressor wheel, and an intercooler including an intercooler core. In a side view, at least a part of the intercooler core, a part of the turbine wheel and a part of the radiator core are within an area enclosed by a first connecting line, a second connecting line, an engine-body front-surface and a wheel rear-surface. In an upward-downward or forward-backward direction of the cylinder axis, the intercooler-core upper end is more upward than the turbine-wheel upper end, the intercooler-core front end is more frontward than the turbine-wheel front end, the intercooler-core lower end is more upward than the radiator-core upper end, and the radiator-core rear end is more frontward than both the turbine-wheel rear end and the intercooler-core rear end.

This exhaust structure for a vehicle-mounted engine has an air intake channel 3 disposed on one side of an engine main body and an exhaust channel disposed on the other side thereof, the exhaust structure for the vehicle-mounted engine comprising: a turbine of a turbocharger disposed on the other side of the engine main body and connected to the exhaust channel; a first exhaust gas purification device connected to the exhaust channel downstream of the turbine; and a second exhaust gas purification device connected to the exhaust channel 4 downstream of the first exhaust gas purification device. The first exhaust gas purification device is disposed so as to be near the rear of the turbocharger, and the second exhaust gas purification device is disposed so as to be near a cylinder hock on the other side of the engine main body.

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

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 bayonet joint having a connector with bayonet tabs arranged on the exterior of the connector, a tubular body with at least one external bayonet contour arranged on the exterior of the tubular body and a bayonet ring with inward facing bayonet hooks and at least one inward facing internal bayonet contour. In an assembled state of the bayonet joint, the connector, tubular body and bayonet ring are in a locking orientation relative to one another. The bayonet ring surrounds an outside of the connector and the tubular body in the radial direction and secures the connector and the tubular body against removal from the bayonet ring.

A vehicle engine 2 comprises an exhaust system having an exhaust manifold 12 and an exhaust purification device 18. The exhaust manifold 12 is disposed at a predetermined distance from a dash panel 106 constituting a body of the vehicle 100, the exhaust purification device 18 is disposed in a position overlapping a floor tunnel region 114, formed by a floor tunnel of the body, and is disposed below the exhaust manifold 12 and to one side of the center of the engine 2 in the cylinder-array direction, as viewed from the longitudinal direction of the vehicle 100. An exhaust purification device introduction passage 17 connecting the exhaust manifold 12 and the exhaust purification device 18 is disposed on the other side of the center of the exhaust manifold 12 in the cylinder-array direction, and extends below the exhaust manifold 12 to be connected to the exhaust purification device 18.

Described herein is a turbocharging system comprising a compressor having an air inlet and a compressed air outlet, the compressed air outlet to couple with the intake manifold of the internal combustion engine, a first turbine coupled to the compressor, the compressor driven without using power from the internal combustion engine; and a vacuum compressor coupled directly or indirectly to the first turbine. The first turbine can drive a common drive shaft that includes the compressor and the vacuum compressor or output of the first compressor can drive a second compressor that is coupled with the vacuum compressor. The vacuum compressor can be used to scavenge exhaust from the internal combustion engine.

Described herein is a turbocharging system comprising a compressor having an air inlet and a compressed air outlet, the compressed air outlet to couple with the intake manifold of the internal combustion engine, a first turbine coupled to the compressor, the compressor driven without using power from the internal combustion engine; and a vacuum compressor coupled directly or indirectly to the first turbine. The first turbine can drive a common drive shaft that includes the compressor and the vacuum compressor or output of the first compressor can drive a second compressor that is coupled with the vacuum compressor. The vacuum compressor can be used to scavenge exhaust from the internal combustion engine.

Disclosed is a high-speed section disconnect for a driven turbocharger with a traction drive. The turbo shaft is attached to a turbine and compressor, and interfaces with a high-speed traction drive. A mechanical coupling connects the traction drive to a transmission, which is connected to the engine so that power can flow to or from the turbo shaft, but the mechanical coupling can be selectively disconnected so that the high-speed section of the driven turbocharger can also be decoupled from the engine during certain operating conditions to reduce mechanical losses in the system.

Disclosed is a high-speed section disconnect for a driven turbocharger with a traction drive. The turbo shaft is attached to a turbine and compressor, and interfaces with a high-speed traction drive. A mechanical coupling connects the traction drive to a transmission, which is connected to the engine so that power can flow to or from the turbo shaft, but the mechanical coupling can be selectively disconnected so that the high-speed section of the driven turbocharger can also be decoupled from the engine during certain operating conditions to reduce mechanical losses in the system.