A diesel engine includes an exhaust-gas purification device and allows the exhaust-gas purification device to be disposed at the upper face side of the diesel engine. The exhaust-gas purification device purifies exhaust gas discharged from the diesel engine. The direction of a long side of the exhaust-gas purification device is perpendicular to the direction in which a crankshaft, included in the diesel engine, extends. An exhaust throttle device is disposed between an exhaust manifold, included in the diesel engine, and an exhaust gas inlet, included in the exhaust-gas purification device.

A flange joining structure comprises flanges of a cylinder head of an internal combustion engine and a turbine housing joined through a gasket. The flange of cylinder head has, in an end face thereof, end parts of a first collecting exhaust pipe and a second collecting exhaust pipe; the flange of turbine housing has, in an end face thereof, end parts of a first pre-merge exhaust pipe and a second pre-merge exhaust pipe corresponding to the end parts of the first collecting exhaust pipe and the second collecting exhaust pipe; and the gasket has, on a face on the cylinder head side, a bead formed into an edge-rounded rectangle having a straight part shorter than the radius of curvature thereof, and surrounding the end parts of the first collecting exhaust pipe and the second collecting exhaust pipe.

An exhaust system for a motor vehicle, with an exhaust pipe for discharging exhaust of a device that produces an exhaust. A heat accumulator, which surrounds the exhaust pipe in the peripheral direction with respect to a longitudinal central axis of the exhaust pipe, is present, at least in regions thereof, and, in the radial direction between the exhaust pipe and the heat accumulator over at least a portion of the longitudinal extension the heat accumulator, a cross-section adjusting element for adjusting a passage cross section is arranged between the exhaust pipe and the heat accumulator. The cross-section adjusting element has a first holed pipe, which surrounds the exhaust pipe, and a second holed pipe, which surrounds the first holed pipe. The first holed pipe and the second holed pipe can be shifted in position relative to each other for adjusting the passage cross section.

A cylinder head with which exhaust manifolds are integrated includes a secondary air supply passage configured to include: a main passage disposed above combustion chambers of an engine, and extending along a cylinder line direction; and plural branch passages establishing individual communications between the main passage and corresponding exhaust ports. The respective plural branch passages are so disposed as to be inclined downward from the main passage toward the exhaust ports. Accordingly, it is possible to prevent corrosion of the cylinder head due to stagnation of condensed water.

An outboard propulsion system comprising a first portion for attachment to a boat, wherein the first portion is fixed about a substantially vertical axis, and a second portion connected to the first portion and configured to rotate about a steering axis, wherein the first portion comprises a sealed housing enclosing a member having a longitudinal axis relative to which it may move and the second portion comprises a gear configured to engage with the member such that movement of the member relative to its longitudinal axis generates rotational movement of the gear about the steering axis, and wherein the sealed housing comprises a sensor configured to determine the position of the member within the sealed housing.

A two-piece, stamped muffler having an integrally-attached aerodynamic shield having a flat bottom shape is disclosed. The muffler may be formed with a substantially flat lower surface. The aerodynamically-improved muffler set forth herein is provided as an aerodynamic shield that is incorporated into an extended flange provided in the shell blank, as a deflector that is attached to a muffler lower shell body and the clamshell flange such as by welding, that is separately attached to the clamshell flange only such as by welding, or that is separately attached to the lower shell only, again possibly by welding. For dual stamped mufflers, the shield may be used jointly with an incremental shield separate from, or integrated into, the spare tire well to connect the twin dual muffler shields to achieve vehicle aerodynamic requirements. A muffler having the aerodynamic shield deflects underbody air flow outside of the rear fascia cavity.

An exhaust apparatus of an outboard motor equipped with a four-stroke engine includes an exhaust pipe having a cylindrical shape and being connected to an exhaust passage of an engine holder, wherein the exhaust pipe is disposed in an exhaust passage of the exhaust manifold in a manner being erected upright in parallel to the crankshaft, and the exhaust pipe has an upper end opened in an upper portion of the exhaust passage and a lower end supporting the cylinder block, and the exhaust manifold and the exhaust pipe are provided with a gap therebetween in a plan view acting as an exhaust collection space adapted to collect exhaust gas from the exhaust manifold.

A cylinder head of an internal combustion engine includes a first exhaust port section having an upstream inlet opened and closed by a first exhaust valve, a second exhaust port section having an upstream inlet opened and closed by a second exhaust valve, and a collective exhaust port section into which the first and second exhaust port sections merge at downstream ends thereof. In a fixing structure for an exhaust gas sensor, the sensor is fixed to the collective exhaust port section with its sensing tip in the port section. An exhaust gas guide part is formed, at a position upstream of the sensor, on an internal wall of the port section, opposite the internal wall to which the sensor is fixed, so as to bulge out to guide exhaust gas toward the sensor, whereby exhaust gas is effectively intermixed and directed to the sensor with resultant increased sensing accuracy.

An internal combustion engine generates a cleaner exhaust. A combustion chamber combusts a fuel and generates combustion products. A fuel inlet channel introduces the fuel into the combustion chamber. An air inlet channel introduces air into the combustion chamber. An outlet channel discharges the combustion products from the combustion chamber. A set of electrodes is arranged inside the internal combustion engine that generate an electric field in contact with the fuel, the air and/or the combustion products when a voltage is applied across the set of electrodes. A sensor is arranged inside the internal combustion engine that measures a combustion condition. A controller adapts the electric field based on the combustion condition. The engine generates exhaust with reduced toxicity and waste product relative to prior combustion engines by energizing a fluid mixture of fuel, air, and combustion products to improve a redox reaction causing a more complete combustion reaction.

A machine body comprises a sieving frame having a bottom plate. The machine body comprises an engine. The machine body comprises an exhaust gas cleaning apparatus that executes reduction treatment on a predetermined oxide in an exhaust gas of the engine by injecting a liquid reducing agent. The machine body comprises a reducing agent tank that stores a liquid reducing agent. The machine body comprises a reducing agent pump that feeds the liquid reducing agent stored in the reducing agent tank to the exhaust gas cleaning apparatus. The machine body comprises a cooling fan. The machine body is disposed on the bottom plate of the slewing frame and comprises an opening section that takes in outside air that cools the reducing agent pump by driving the cooling fan. The machine body comprises a duct section that leads the outside air taken from the opening section to the cooling fan.