A tractor includes: a vehicle body; an engine bonnet forming an engine compartment; an engine; a first exhaust-gas cleaning device that purifies an exhaust gas and is above the engine such that its long side is substantially parallel to a vehicle-body lateral width direction; a second exhaust-gas cleaning device that purifies the exhaust gas and is behind the engine such that its long side is substantially parallel to the lateral width direction; a vehicle body frame; and a supporting tool that is supported by the vehicle body frame, supports the first and second exhaust-gas cleaning devices, and includes a support column that extends upward from the vehicle body frame along a front portion of the second exhaust-gas cleaning device, and a support arm that extends forward from an upper portion of the support column along a lower portion of the first exhaust-gas cleaning device.

Methods and systems are provided for an exhaust muffler system with multiple inlets of different diameters. In one example, the muffler system may include multiple sets of inlet pipes to a muffler with each set of inlet pipes including pipes of different diameters with valves controlling exhaust flow into the inlet pipes. Exhaust from an engine bank may flow to a distinct set of inlet pipes and a distinct outlet pipe of the muffler via a separate exhaust passage.

A saddle-riding type vehicle exhaust structure includes: an exhaust pipe that is connected to an exhaust port connecting to a combustion chamber of an engine and has a circular cross-sectional shape which is orthogonal to an exhaust flow direction; and a muffler that is connected to a downstream side in the exhaust flow direction of the exhaust pipe, wherein the exhaust pipe includes a muffler connection part that is connected to the muffler, an exhaust pipe upstream part that is connected to an upstream side in the exhaust flow direction of the muffler connection part, and an exhaust pipe downstream part that is connected to a downstream side in the exhaust flow direction of the muffler connection part, a cross-sectional area that is orthogonal to the exhaust flow direction of the muffler connection part is larger than each of a minimum value of a cross-sectional area that is orthogonal to an exhaust flow direction of the exhaust pipe upstream part and a minimum value of a cross-sectional area that is orthogonal to an exhaust flow direction of the exhaust pipe downstream part, and a vehicle width direction size of the cross-sectional shape of the muffler connection part and a vertical direction size of the cross-sectional shape of the muffler connection part are different from each other.

An exhaust device that guides exhaust gas from an exhaust pipe in front of an engine to a muffler in a rear of the engine is provided. The exhaust device includes a primary catalyst case accommodating a primary catalyst configured to purify the exhaust gas at a downstream side from the exhaust pipe, a secondary catalyst case accommodating a secondary catalyst configured to purify the exhaust gas at a downstream side from the primary catalyst, and a chamber formed with a muffling chamber configured to reduce an exhaust noise at a downstream side from the secondary catalyst. The primary catalyst case is disposed in a front space of the engine. The secondary catalyst case is disposed on a front part of a lower space of the engine. The chamber is disposed so as to occupy at least a rear part of the lower space of the engine.

A jet propelled watercraft includes a watercraft body, an engine housed in the watercraft body, a jet propulsion unit that suctions and jets water with a drive force of the engine, a first exhaust pipe connected to an exhaust port of the engine, and a catalyst storage connected to the first exhaust pipe, wherein the first exhaust pipe and the catalyst storage are integral and unitary with each other.

Embodiments of a tank cover for covering a diesel exhaust fluid tank of a vehicle. The tank cover can be added directly over a diesel exhaust fluid tank or can be used to replace a factory/OEM or other replacement cover. In some embodiments, the tank cover can be easily installed onto a vehicle through existing components, and no additional drilling may need to be performed.

A bulldozer according to the present application includes a main frame, and an engine, a hood and an exhaust after-treatment device are provided on the main frame, an air inlet of the exhaust after-treatment device is in communication with an air outlet of a turbine of the engine via a pipeline, and the exhaust after-treatment device is fixed to the hood. In the bulldozer, vibration generated by the engine is transmitted to the main frame through an engine supporting frame or a damping device, and then transmitted from the main frame to the hood, the transmission path of the vibration is long, thus the vibration damping becomes complicated and has a high damping value, and the vibration transmitted to the air cleaner is really small.

A dump truck includes: a main frame that extends in a front-back direction of a vehicle body; an engine installed on the main frame; an exhaust aftertreatment device that is supported by the main frame and purifies exhaust gas from the engine; and a communication pipe having a first end connected to the engine and a second end connected to the exhaust aftertreatment device, in which the exhaust gas discharged from the engine flows to the exhaust aftertreatment device. The communication pipe includes: an upstream pipe extending from the engine to a lateral side thereof; a bellows pipe angularly connected to the upstream pipe and extending in an up-down direction; and a downstream pipe angularly connected to the bellows pipe.

An exhaust system including: an exhaust pipe including a straight portion, and a bent portion that is bent and extends from a downstream end of the straight portion; a muffler provided on a downstream side of the exhaust pipe; and a reinforcing member, wherein: the straight portion of the exhaust pipe is connected with an upstream end of the muffler through the bent portion; and the reinforcing member is provided so as to extend across a downstream end portion of the straight portion, and an upstream end portion of the muffler.

A work vehicle includes a hood, an engine, a radiator, an air cleaner, and a condenser. The hood covers an engine compartment located on a front portion of a traveling body. The engine is a drive source. The radiator supplies a coolant to the engine. The air cleaner takes in outside air and supplies the air to the engine. The condenser cools a refrigerant. In front of the radiator, the air cleaner and the condenser are disposed one above the other. The condenser is withdrawable in the left and right direction.