An exhaust treatment system for a work vehicle includes a reductant injector configured to inject an exhaust reductant into the engine exhaust flow flowing through a mixing conduit. A flow separation nozzle is located downstream of the reductant injector and is configured to separate a liquid reductant flow from an inner conduit wall of the mixing conduit for mixing with the engine exhaust flow flowing therein.

An exhaust treatment system for a work vehicle includes a reductant injector configured to inject an exhaust reductant into the engine exhaust flow flowing through a mixing conduit. A plurality of flow separation elements are located downstream of the reductant injector and are configured to separate a liquid reductant flow from an inner conduit wall of the mixing conduit for mixing with the engine exhaust flow flowing therein.

The present disclosure provides a method for molding a pipe body that can inexpensively mold a pipe body having a tapered portion radially outwardly projecting relative to a large-diameter portion. The method for molding a pipe body comprises: molding of a tubular body by bending an unfolded stock so as to wrap a core metal; and removal of the core metal from inside the tubular body. The core metal comprises a first core metal piece for molding a projecting portion of the tapered portion. During the molding of the tubular body, the first core metal piece at least partly abuts on an inner surface of the projecting portion of the tapered portion, and does not abut on an area of the inner surface of the large-diameter portion located in an opposite side of a central axis of the large-diameter portion from the projecting portion.

A vane swirl mixer for exhaust aftertreatment includes: a vane swirl mixer inlet; a vane swirl mixer outlet; a first flow device including: a Venturi body; a plurality of upstream vanes positioned within the Venturi body; a plurality of upstream vane apertures interspaced between the plurality of upstream vanes; a plurality of downstream vanes positioned within the Venturi body; and a plurality of downstream vane apertures interspaced between the plurality of downstream vanes. At least one of the upstream vane hub and the downstream vane hub is radially offset from a Venturi center axis, thereby causing individual ones of the plurality of vanes coupled to the radially offset vane hub to differ in their geometry.

A multi-stage mixer includes a multi-stage mixer inlet, a multi-stage mixer outlet, a first flow device, and a second flow device. The multi-stage mixer inlet is configured to receive exhaust gas. The multi-stage mixer outlet is configured to provide the exhaust gas to a catalyst. The first flow device is configured to receive the exhaust gas from the multi-stage mixer inlet and to receive reductant such that the reductant is partially mixed with the exhaust gas within the first flow device. The first flow device includes a plurality of main vanes and a plurality of main vane apertures. The plurality of main vane apertures is interspaced between the plurality of main vanes. The plurality of main vane apertures is configured to receive the exhaust gas and to cooperate with the plurality of main vanes to provide the exhaust gas from the first flow device with a swirl flow.

The present invention relates to a manifold for receiving exhausts from a multi-cylindrical internal combustion engine. The internal combustion engine has such a firing order that the riser in the manifold receives exhausts from two cylinders during an overlapping stage, simultaneously via an inlet opening arranged upstream and from an inlet opening arranged downstream in the riser. The riser comprises a substantially constant cross sectional area, except in one area, which is located in a position in connection with the inlet opening arranged downstream of the two inlet openings, receiving exhausts simultaneously. Said area has a geometry facilitating receipt and flow of exhausts in the predetermined direction in the riser, on occasions when the two inlet openings receive exhausts simultaneously.

A fluid-conduit collector spans across a plurality of collector-inlet interface structures and at least one fluidic diode element. A branch inlet portion of at least one collector-inlet interface structure, in fluid communication with a corresponding fluid-conduit runner portion, provides for receiving exhaust gases from a corresponding separate exhaust port of an intermittent-combustion internal combustion engine. A main inlet portion of the collector-inlet interface structure in fluid communication with an outlet portion thereof defines a portion of the fluid conduit of the collector. The branch inlet portion is in fluid communication with the outlet portion via a collector inlet port that is at least partially bounded by a relatively-sharp-edged junction with the fluid conduit of the collector. The fluidic-diode element located coincident with, or downstream of, the collector inlet port provides for a relatively-higher coefficient of discharge for exhaust gases flowing towards an outlet of the collector, than for an associated reverse-directed bulk flow or acoustic pressure wave flowing in a reverse direction.

A channel cross-sectional area of a lower side channel is set to be smaller than an upper side channel in a predetermined region and greater than the upper side channel on an upstream side and a downstream side of the predetermined region. Accordingly, an ability to drain condensed water is improved by guiding exhaust gas to the lower side channel and facilitating an increase in a flow rate of the exhaust gas guided to the lower side channel. The exhaust gas flowing in the upper side channel and the lower side channel receives flow resistance from a partition member from an extending portion to a front of a main muffler. Thus, the ability to drain the condensed water can be improved with reduction in pressure loss generated in the exhaust gas.

There is provided a secondary air introduction device configured to introduce air into an exhaust port provided in a cylinder head of an engine by using a negative pressure in the exhaust port. A back-flow restriction member is provided between a reed valve and the exhaust port in an air introduction passage, and includes a plate part intersecting with an extension direction of the air introduction passage. The plate part has an air passing region in which the air flowing through the air introduction passage from an air intake unit toward the exhaust port is enabled to pass therethrough and a back-flow cutoff region in which exhaust air, which flows in a direction of directly colliding with at least a valve body of the reed valve, of exhaust air flowing back through the air introduction passage from the exhaust port is cut off.

A vortex generator including an annular bearing for mounting on an interior surface of an exhaust line. The vortex generator further includes an annular blade assembly mounted on the annular bearing. The annular blade assembly includes a leading face with an upstream opening having a first radius. The annular blade assembly further includes a trailing face with a downstream opening having a second radius, wherein the upstream opening and the downstream opening are centered around a longitudinal axis of the exhaust line, and the second radius is different from the first radius. The annular blade assembly further includes a side extending from the leading face to the trailing face, wherein the side has a plurality of openings, each opening of the plurality of openings containing a blade, and each opening of the plurality of openings extends beyond the annular bearing in a direction parallel to the longitudinal axis.