A vehicle that can cool an ignition coil is provided. The vehicle has an engine having a cylinder head and an ignition coil with a first end exposed from the cylinder head, a CVT that varies and outputs rotary power from the engine, and an exhaust duct having a first exhaust port for exhausting a gas within a CVT case to outside of the CVT case, and a second exhaust port for exhausting a part of the gas flowing to the first exhaust port to outside of the CVT case, wherein the second exhaust port is provided for exhausting the gas within the CVT case to at least a part of the first end of the ignition coil.

A riding lawn mower has an internal combustion engine and a muffler with a first housing. The internal combustion engine is connected to the muffler to supply exhaust gases originating from the internal combustion engine to the first housing of the muffler for noise damping of the exhaust gases. A second housing is provided that thermally insulates the first housing of the muffler. The second housing at least partially encloses the first housing of the muffler. The second housing has an exterior side with an emissivity of greater than 0.8.

A muffler, in particular an end muffler, is provided for an exhaust system in a vehicle. The muffler has a muffler housing that has an exhaust intake pipe via which exhaust flows into the muffler housing as well as an exhaust discharge pipe via which exhaust flows out of the muffler housing. At least part of the muffler housing or the entire muffler housing is surrounded by an outer housing, and an air gap is provided between the muffler housing and the outer housing.

Provided is an exhaust gas purification device provided with a cover which can reduce radiated noise at low cost without impairing the heat shield function of the cover. Provided is an exhaust gas purification device comprising: an exhaust gas purification device body provided to the exhaust pipe of a diesel engine and purifying exhaust gas; and a substantially rectangular cover provided so as to cover at least a part of the exhaust gas purification device body and blocking heat radiated from the exhaust gas purification device body. The cover is provided with a plurality of protruding ribs formed on the surface thereof. The ribs comprise: radial ribs formed extending radially from a center section centered at the intersection of the diagonals of the cover; and a circumferential rib formed continuously along the entire circumference of a circle centered at the intersection.

A catalyst device includes a heating element that generates heat when energized, a case that accommodates a catalyst support (heating element), an inflow pipe that draws exhaust gas into the case, and a connecting pipe that connects the inflow pipe and the case to each other. The case includes an end portion, which protrudes further in an upstream direction than an end face of the catalyst support. The inflow pipe is disposed inside the case. The catalyst device includes a triple-walled pipe structure, in which the connecting pipe overlaps with the end portion of the case and the inflow pipe in a covering manner.

A tractor according to an embodiment of the present invention includes a front wheel, a rear wheel, a hood that covers an engine, and an exhaust gas treatment unit. The exhaust gas treatment unit is placed laterally outside right or left side of the hood and behind the front wheel, and purifies exhaust gas from the engine. A circular cylindrical heat shielding plate covers an outer circumferential surface of the exhaust gas treatment unit. A plurality of vent holes are formed in a rear surface of the heat shielding plate, and are not formed in a region that lies on a front surface of the heat shielding plate and faces the front wheel.

An exhaust structure of an internal combustion engine having an exhaust passage communicating between an exhaust port and an exhaust pipe. The exhaust structure includes a heat insulating component covering an inner wall of the exhaust port, the heat insulating component includes a first abutting portion disposed at a first side of the heat insulating component at a combustion chamber side and abutting an inner wall of the exhaust port, a second abutting portion disposed at a second side of the heat insulating component at an exhaust pipe side and abutting the inner wall, and a middle section disposed between the first side and the second side. A gap is formed between the middle section and the inner wall, and a bent portion connecting the middle section and the first abutting portion is bending toward the inner wall of the exhaust port from the middle section.

An exhaust sensor module assembly has a sensor module and a shield. The shield is shaped to receive the module. The shield has a first mounting leg and a first flange extending from a first end of a base plate, and a second mounting leg and a second flange extending from a second end of the base plate. The shield is rotationally symmetric about an axis extending through and normal to the base plate.

A sensor including a sensor element, a metallic shell, a terminal fitting, a cylindrical case, lead wires, a connector portion, and a cylindrical heat shield tube. The heat shield tube includes a first tube and a second tube. The second tube is disposed on a distal end side of the first tube and covers an outer surface of the rear end side of the case, while providing an overlapping portion that overlaps the first tube. A rear end side of the first tube is adjacent to the connector portion. A total length T of the heat shield tube and a length S of the overlapping portion satisfy T/10≤S≤T/5. Further, a length L1 of the first tube and a length L2 of the second tube satisfy T/2≤L2<L1.

An exhaust handling system comprising: an exhaust pipe having an exhaust outlet, said exhaust outlet having a nozzle arranged to vent exhaust gas; at least one acceleration jet arranged to project an air flow at a velocity head greater than that of the vented exhaust gas; wherein the at least one acceleration jet and exhaust outlet are positioned to project the air flow so as to impinge on a path of said vented exhaust gas, and consequently transfer velocity head to the vented exhaust gas.