An exhaust after-treatment mounting arrangement is provided that is mounted outside of an engine compartment and has a perforated enclosure allowing air to permeate the enclosure and establish an airflow through the enclosure to maintain part integrity of components of an exhaust after-treatment system with maximum temperature thresholds. Components of the exhaust after-treatment system may be mounted to permit movement of such components relative to upstream and downstream components in the exhaust system. The enclosure is configured to prevent contact of the hot components by operators and/or flammable materials with small venting holes through top surfaces of the enclosure and large vent holes in bottom areas of the box that allow large volumes of air to easily flow into the enclosure.

An exhaust after-treatment mounting arrangement is provided that is mounted outside of an engine compartment and has a perforated enclosure allowing air to permeate the enclosure and establish an airflow through the enclosure to maintain part integrity of components of an exhaust after-treatment system with maximum temperature thresholds. Components of the exhaust after-treatment system may be mounted to permit movement of such components relative to upstream and downstream components in the exhaust system. The enclosure is configured to prevent contact of the hot components by operators and/or flammable materials with small venting holes through top surfaces of the enclosure and large vent holes in bottom areas of the box that allow large volumes of air to easily flow into the enclosure.

An exhaust system for discharging an exhaust gas of an engine includes a tail pipe 39 provided with a pressure control valve 1 which reduces an exhaust amount of the gas at the time of low load of the engine, and other tail pipe 40 not provided with the pressure control valve 1. An exhaust port 39a of the tail pipe 39 provided with the pressure control valve 1 faces downward as compared with an exhaust port 40a of the other tail pipe 40 not provided with the control valve 1.

An exhaust device structure for a rocking vehicle includes: a front side exhaust device and a rear side exhaust device muffling exhaust gas noise from an engine; the front side exhaust device and the rear side exhaust device including a front side exhaust pipe and a rear side exhaust pipe having upstream ends connected to exhaust ports of the engine and a first muffler and a second muffler connected to downstream ends of the front side exhaust pipe and the rear side exhaust pipe, the first muffler and the second muffler being disposed on a lower side of the vehicle, the first muffler and the second muffler being arranged to be separated from each other in a forward-rearward direction of the vehicle, and the first muffler and the second muffler being arranged so as to be separated from each other in a left-right direction with respect to a vehicle center.

An exhaust duct has a riser duct section which is connected to an exhaust port having such an inlet port at a lower portion of the riser duct section as is connected to an exhaust port for the combustion gas, the exhaust port being opened at a lower portion of the combustion box. The riser duct section extends upward along an external surface of the combustion box. Suppose that a direction normal to the external surface of the combustion box is defined as a front-to-back direction, and a horizontal direction perpendicular to the front-to-back direction is defined as a lateral direction, then the riser duct section is formed into a flat shape having a smaller dimension in the front-to-back direction than the dimension in the lateral direction. Fluctuations in width between front-side and back-side plate parts of the riser duct section are devised to be restrained, and increase in size can be avoided. The riser duct section has a rail inside the riser duct section, the rail being elongated in the vertical direction and connecting together the front-side and the back-side plate parts.

A working vehicle includes an engine, an air blowing device, an exhaust gas post-processing device, and a guide device. The air blowing device is disposed in front of the engine. The exhaust gas post-processing device processes exhaust gas from the engine, and is disposed above the engine. The guide device lifts and guides at least portion of the air from the air blowing device to an upper side where the exhaust gas post-processing device is provided.

An exhaust discharge system is disclosed. The exhaust discharge system comprises an exhaust stack including a first conduit and a second conduit. The first conduit defines a first flow passageway and arranged around a first longitudinal axis. The first conduit including a skirt portion and a body portion disposed downstream of the skirt portion, and the skirt portion is oriented to slope outward from the body portion. The second conduit is disposed downstream of the first conduit. The second conduit defines a second flow passageway and is arranged around a second longitudinal axis, the second conduit includes a sidewall and an exit port, the exit port having an exit-port cross-section, wherein the exit-port cross-section is oblong in shape. The second longitudinal axis is disposed at an intersection angle to the first longitudinal axis, the intersection angle in a range of 125 to 150. The exhaust stack is configured to convey treated exhaust from the skirt portion to the exit port.

An exhaust treatment system includes an engine, an exhaust line in fluid communication with the engine, a three-way catalyst downstream of the engine on the exhaust line, a particulate filter downstream of and proximate to the three-way catalyst on the exhaust line, and a sorbent unit comprising a first sorbent and a second sorbent downstream of the three-way catalyst and the particulate filter on the exhaust line. The first sorbent and the second sorbent are proximate to a tailpipe of the exhaust line. A method of treating an exhaust emission from an internal combustion engine during an engine cold-start is also described.

An engine includes an exhaust gas purification device for treating exhaust gas. The exhaust gas purification device is arranged on the upper surface side of the engine. Regarding structure in which an exhaust throttle device is provided in an installation portion of an exhaust manifold on one side of the engine, the exhaust throttle device is inclined and disposed with respect to the right side surface of the engine in a plan view, and a gap is formed between the right side surface of a head cover and the inner side surface of the exhaust throttle device.

Provided is an exhaust pipe structure for an internal combustion engine, the exhaust pipe structure being configured so that: the exhaust pipe structure is smaller than conventional exhaust pipe structures; the unevenly distributed flow of exhaust gas can be sufficiently suppressed; and the temperature of an exhaust purification catalyst can be quickly increased. An exhaust pipe structure (10) is configured so that a circular cylindrical exhaust purification catalyst device (7) provided with an exhaust gas purification catalyst is disposed in an engine room (E) at a position near an engine (2). The exhaust pipe structure (10) comprises: an exhaust pipe body (1) extending in a curved shape toward the upper end (70) of the exhaust purification catalyst device (7); and an exhaust pipe introduction section (5) for connecting the exhaust pipe body (1) and the upper end (70). The center (C1) of the exhaust inlet opening (11) is located offset from the center axis (X) of the exhaust purification catalyst device (7) when the exhaust pipe body (1) is viewed from the exhaust inlet opening (11) side, and the end (12) of the exhaust pipe body (1), which faces the exhaust purification catalyst device (7), is connected to the outer peripheral side of the exhaust pipe introduction section (5). The exhaust pipe introduction section (5) has a space between the exhaust pipe introduction section (5) and the upper end surface (70a) of the upper end (70) and extends from the end (12) to the outer peripheral end section (7a) of the exhaust purification catalyst device (7) while being tilted toward the exhaust purification catalyst device (7).