A structure for cooling an exhaust manifold may include a duct cooling the exhaust manifold by using traveling wind or fan wind, a duct opening and closing portion mounted at a rear end of the duct for cooling an exhaust manifold to open or close the duct for cooling an exhaust manifold, and an exhaust manifold protector disposed at a lower end of the duct for cooling an exhaust manifold and enclosing the exhaust manifold.

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-driven working machine capable of favorably reducing exhaust sound (that is, noise) is provided. An engine-driven working machine 10 is a generator in which an engine 15 and a muffler 67 are housed in an inside 13 of an outer case 12. The generator 10 includes a tail pipe 68 that is provided at a lower portion 67a of the muffler 67, a discharge port 37 that is disposed above the tail pipe 68, and a baffle plate 84 that is disposed to face the discharge port 37. The discharge port 37 is formed in the outer case 12. Further, cooling air that is sent from a cooling fan 17 is guided to below the muffler 67 with the baffle plate 84.

In order to improve the performance of keeping the temperature of an exhaust purifier when a vehicle is running, an engine is provided with an exhaust passage behind a cylinder head in the vehicle longitudinal direction. The exhaust passage includes an exhaust manifold and an exhaust purification system disposed serially in a flow direction of an exhaust gas, the exhaust manifold being located upstream of the exhaust purification system. The exhaust purification system contains a GPF device configured to purify a gas. The exhaust purification system is located below the exhaust manifold, and is disposed so as to overlap the exhaust manifold in the vehicle transverse direction. The exhaust purification system is also disposed so as to protrude with respect to the exhaust manifold rearward in the vehicle longitudinal direction.

A work vehicle such as a tractor including a cooling fan (12a) arranged in front of the vehicle's engine main body (1), and is configured to feed air to the engine main body. The work vehicle further includes a DPF (19), which is arranged on one side of the engine main body and purifies exhaust gas exhausted from the engine main body, and an engine hood (7), which covers the engine main body, the cooling fan, and the DPF. An outside air intake port (21) is formed in both side surfaces of the engine hood at a position further forward than the cooling fan. On both side surfaces of the engine hood, a first opening (30) capable of exhausting air inside the engine hood in a direction away from the vehicle's operation seat in side view is formed in a position facing the DPF in the lateral direction.

A muffler for decreasing the amount of noise of exhaust gases from a combustion engine is fluid connected with an exhaust port of an engine cylinder through an exhaust pipe. The interior of the muffler is divided into a first expansion chamber on the most upstream side, and a second expansion chamber on a downstream side thereof. The exhaust pipe is fluid connected with the muffler so as to be present within the first expansion chamber. The muffler is furthermore provided with a cooling pipe, which extends through the first expansion chamber, and a cooling air flows through cooling pipe.

A terminal pin, in particular for a terminal unit for the electrical contacting of a heating conductor of an exhaust-gas heater of an exhaust-gas system of an internal combustion engine, includes a pin body which is elongate in the direction of a pin body longitudinal axis and which has an outer connection region for the connection of a voltage supply line to the terminal pin, a cooling region, a leadthrough region for the electrically insulated leadthrough of the pin body through a pin support of a terminal unit, and an inner connection region for the connection of the terminal pin to a heating conductor of an exhaust-gas heater, a cooling surface formation being provided in the cooling region.

The invention relates to a process, consisting in cooling at least one component, such as a sensor, arranged within a compartment of an exhaust after treatment system of a vehicle. The exhaust after treatment system comprises a cooling system that is activated during active regeneration of one or more particulate filters arranged within the exhaust after treatment system compartment and that includes a pipe, for blowing fresh air on the component to be cooled or for extracting hot air present at the vicinity of the component to be cooled, so that said component is protected as a priority against high temperatures during active regeneration periods.

An air delivery system for a farm machine according to the present disclosure can include a first rotary blower and a first aftertreatment enclosure. The first rotary blower can include a housing and have a first rotor and a second rotor rotatably disposed in the housing. The first and second rotors can have meshed lobes for transporting air from an inlet port to an outlet port. A first aftertreatment enclosure can be configured on the farm machine and include a first inlet, a second inlet and an outlet. The first inlet can receive engine exhaust from an engine of the farm machine. The second inlet can receive air from the rotary blower. A temperature of the engine exhaust can be reduced upon exiting the first aftertreatment enclosure through the outlet.

An exhaust pipe mounted heat duct in an electrical generator includes an exhaust pipe coupleable to an internal combustion engine of the electrical generator to receive exhaust therefrom, the exhaust pipe having a first support member and a second support member extending outwards from the exhaust pipe. The exhaust pipe mounted heat duct also includes a heat duct assembly comprising a first component and a second component, the first component mounted to the first support member and a second component mounted to the second support member, the first component coupled to the second component to substantially surround the exhaust pipe.