An exhaust system has at least one exhaust tailpipe which is led through a rear apron of the motor vehicle. The drive train of the vehicle has a rear axle. An air duct is provided in a rear region, which air duct supplies exterior air to the at least one exhaust tailpipe at least in sections. The rear axle has at least one rear axle cover at least in sections. An air inlet opening of the air duct is arranged behind the rear axle cover in a travel direction of the motor vehicle. As a result of the design of the motor vehicle, the rear apron is protected from impingement by hot exhaust gases.

An engine device including an exhaust gas purification device above a cylinder head through a support pedestal. The support pedestal has a flat portion on which the exhaust gas purification device is mounted, and a plurality of legs which protrude downward from the flat portion and are fixed to the cylinder head. The flat portion and the leg portions are formed integrally. Portions between the legs are each formed in an arch-shape.

A heat management system for air-cooled engines suitable to power yard care equipment or vehicles. The system may generally comprise an engine, a blower configured to blow ambient cooling air across the engine, and an exhaust system comprising an exhaust header and a muffler. The exhaust header has an inlet end which receives heated exhaust gas from the engine and an outlet end fluidly coupled to the muffler. An air control baffle is configured to redirect a portion of the cooling air from the blower towards the exhaust header and the muffler to enhance cooling the exhaust system. The system may further include an outermost protective shield exposed to equipment operators and an inner heat barrier or shield located between the muffler and protective shield. The system is designed to ameliorate both radiative and convective sources of heat transfer to maintain the protective shield at temperatures below established industry standards.

A problem to be solved is to provide an exhaust promotion method, an exhaust promotion device, and an exhaust system improvement method for an internal combustion engine capable of further improving the exhaust efficiency by high-speed exhaust of exhaust gas. What is characteristic is that an exhaust gas discharged from the internal combustion engine is expanded in multiple stages repeatedly to reduce a temperature thereof, and thus exhaustion is performed while suppressing a behavior derived from a thermal energy of the exhaust gas.

An engine device includes an exhaust gas purification device above a cylinder head through a support pedestal. The support pedestal has a flat portion on which the exhaust gas purification device is mounted, and a plurality of legs which protrude downward form the flat portion and are fixed to the cylinder head. The flat portion and the leg portion are formed integrally. Portions between the legs are each formed in an arch-shape.

An engine device includes an exhaust gas purification device above a cylinder head through a support pedestal. The support pedestal has a flat portion on which the exhaust gas purification device is mounted, and a plurality of legs which protrude downward form the flat portion and are fixed to the cylinder head. The flat portion and the leg portion are formed integrally. Portions between the legs are each formed in an arch-shape.

An internal-combustion-engine warm-up apparatus includes: a post-processing apparatus; a heater arranged upstream of the post-processing apparatus on the exhaust path; a circulation path where air having passed through the post-processing apparatus is fed back to an upstream side of the heater; an air pump that is a blower that feeds air heated by the heater to the post-processing apparatus; a coolant flow path; a heat exchanger; and a control apparatus that controls operation of the heater and the blower, and in a state where the engine is stopped, the control apparatus causes the heater and the air pump to operate, and causes the air heated by the heater to be supplied to the post-processing apparatus and the heat exchanger.

An exhaust silencer for a motor vehicle is provided. In one example, the silencer comprises a noise-reducing structure and a heat sink to transfer heat from exhaust gases to the exterior of the silencer, the heat sink comprising two regions of fins which define a plurality of flow channels through the heat sink, the flow channels directing the flow of exhaust through the silencer from an inlet passage to an outlet passage. In this way, a temperature of the exhaust is reduced, and the silencer and downstream components of an exhaust system may be constructed of materials of a lower thermal tolerance.

In an engine room, heat insulators are provided on the rear side in the forth and back direction of a vehicle with respect to an engine and on the front side in the forth and back direction of the vehicle with respect to a dash panel arranged on a back side of the vehicle with respect to the engine. A top flange portion is formed at a top of a first heat insulator. The top flange portion is extending in a direction obliquely upward and backward of the vehicle to guide air heated by an exhaust system from the engine in an upward direction of the vehicle. A top bent portion is formed at a top of a second heat insulator such that the top bent portion is arranged in the vicinity of the cowling panel in order to guide the heated air in an upward direction of the vehicle.

Methods, systems, and vehicles that control the temperature of a device included in the vehicle are presented herein. The temperature of the device is controlled by ventilating the device with drivetrain air, such as transmission cooling air. In some embodiments, the device is at a greater temperature than the drivetrain air, which cools the device. In other embodiments, the device is at a lesser temperature than the drivetrain air, which heats the device. The drivetrain air is provided to the device through an exhaust duct coupled to the vehicle's transmission. The drivetrain exhaust air is preferably circulated by the transmission. The transmission may be a continuously variable transmission. The device may be an oxygen sensor that is coupled to an engine exhaust pipe. The oxygen sensor is thermally coupled to the engine exhaust and the engine exhaust pipe, which are at greater temperatures than the transmission exhaust air.