Abstract: A reactor is located in a gas gathering chamber through which exhaust gas in an exhaust system flows curvedly. An addition agent is sprayed against the reactor from upstream of the chamber to facilitate gasification through heat receiving. Rectification vanes are arrayed in a direction bisecting an angle formed by inflow and outflow directions of the exhaust gas and a support for supporting opposite ends of each of the vanes. Opposite ends of the vanes are inserted into slots on slanting sides of opposite side walls in the support to provide installed state. The vanes in the installed state are adapted to provide mounted postures along the flow of the exhaust gas.

Abstract: An upstream portion of a communication passage 16 in an exhaust emission control device has a gas gathering chamber 16A encircling and gathering exhaust gas 1 from an exit end of a particulate filter 3 through perpendicular turnabout of the gas 1 and a communication pipe 16B extracting the gas 1 gathered by the chamber 16A through an exhaust outlet 17 into an entry side of a selective reduction catalyst 4. An injector 18 is in the passage 16 to add urea water into the gas flow. The injector 18 is fixed to the chamber 16A in a position opposed to the outlet 17 and in a direction perpendicular to an axis of the filter 3. The outlet 17 of the chamber 16A has a reactor 19 into which the reducing agent injected by the injector 18 is impinged to facilitate gasification of the gas 1.

Abstract: An upstream portion of a communication passage 16 in an exhaust emission control device has a gas gathering chamber 16A encircling and gathering exhaust gas 1 from an exit end of a particulate filter 3 through perpendicular turnabout of the gas 1 and a communication pipe 16B extracting the gas 1 gathered by the chamber 16A through an exhaust outlet 17 into an entry side of a selective reduction catalyst 4. An injector 18 is in the passage 16 to add urea water into the gas flow. The injector 18 is fixed to the chamber 16A in a position opposed to the outlet 17 and in a direction perpendicular to an axis of the filter 3. The outlet 17 of the chamber 16A has a reactor 19 into which the reducing agent injected by the injector 18 is impinged to facilitate gasification of the gas 1.

Abstract: Disclosed is an exhaust emission control device having a particulate filter 3 and a selective reduction catalyst 4 arranged in parallel with each other such that entry sides of them are directed in a same direction. A communication passage 16 is arranged to oppositely turn exhaust gas 1 from an exit side of the selective reduction filter 3 into the entry side of the adjacent selective reduction catalyst 4. The urea water (reducing agent) is addable upstream of the communication passage 16. The communication passage 16 is stepwisely turned to the entry side of the adjacent selective reduction catalyst 4 through bending portions x and y downstream of an added position of the urea water. At least the most upstream bending portion x is formed to have a bending angle when viewed from an axial direction of the selective reduction filter 3.

Abstract: Provided are gas dispersion portion 7C covering entry end face of selective reduction catalyst 4 (aftertreatment device) and introducing exhaust gas 1 through exhaust feed port 11 from direction substantially perpendicular to axis of aftertreatment device and mixing pipe 7B (exhaust conduit) curved from exhaust feed port 11 in the gas dispersion portion 7C toward exit side of the selective reduction catalyst 4 to extend axially of aftertreatment device. Gas dispersion portion 7C is of crushingly deformed shape to ensure area from exhaust feed port 11 to vicinity of extension of axis of the selective reduction catalyst 4 as fan-likely spreading flow guide space 12, remaining area being flat throttling space 13 close to entry end face of selective reduction catalyst 4. Boundary between throttling and flow guide spaces 13 and 12 in crushing deformed shape is formed as arc-like taper slope 14.

Abstract: A lattice board is obliquely arranged in a bent portion halfway in an exhaust pipe where exhaust gas flows curvedly so as to bisect an angle made by inflow and outflow directions the exhaust gas entered upstream of and discharged downstream of the bent portion, respectively. An injector is arranged in the outflow direction of the exhaust gas to inject urea water to an entry side of the lattice board such that flow passage walls of the lattice board on which hit is the exhaust gas from upstream has rear surfaces on which hit is a spray of urea water from the injector.

Abstract: An exhaust purification device for purifying exhaust gas flowing in an exhaust gas flow passage of an engine includes: a cylindrical casing; a pipe that is disposed on a downstream side of the casing and inserted in the casing so as to extend in a direction substantially orthogonal to an axial direction of the casing, the pipe being provided with a through-hole communicating with the casing; and an injector configured to inject a reducing agent from an upstream end of the pipe into the pipe, in which a contracting flow passage portion narrowing in an axial direction of the pipe from an upstream side toward the downstream side is formed in the exhaust gas flow passage in the casing.

Abstract: An exhaust gas purification system includes an exhaust purifying element for purifying exhaust gas, and a selective reduction catalyst for promoting reduction of NOx contained in the exhaust gas with a reducing agent. A housing for accommodating the exhaust purifying element includes an outer wall having an accommodating portion. A supply hole is formed on a bottom of the accommodating portion. A pipe that is located inside the housing has a passage through which an interior of the pipe communicates with an exterior of the pipe. The pipe is configured to guide exhaust gas toward the selective reduction catalyst through the passage and the interior of the pipe. The pipe has an end communicating with the supply hole. The injection device of the exhaust gas purification system injects the reducing agent to an interior of the pipe through the supply hole.

Abstract: A lattice board 7 is obliquely arranged in a bent portion 1A (a flow changing portion) halfway in an exhaust pipe 1 where exhaust gas 4 flows curvedly so as to substantially bisect an angle made by inflow and outflow directions (see arrows x and y in the figure) of the exhaust gas entered upstream of and discharged downstream of the bent portion 1A, respectively. An injector 3 is arranged in the outflow direction of the exhaust gas 4 to inject urea water 5 (additive) to an entry side of the lattice board 7 such that flow passage walls of the lattice board 7 on which hit is the exhaust gas 4 from upstream has rear surfaces on which hit is a spray of urea water 5 from the injector 3.

Abstract: An exhaust purification device for purifying exhaust gas flowing in an exhaust gas flow passage of an engine includes: a cylindrical casing; a pipe that is disposed on a downstream side of the casing and inserted in the casing so as to extend in a direction substantially orthogonal to an axial direction of the casing, the pipe being provided with a through-hole communicating with the casing; and an injector configured to inject a reducing agent from an upstream end of the pipe into the pipe, in which a contracting flow passage portion narrowing in an axial direction of the pipe from an upstream side toward the downstream side is formed in the exhaust gas flow passage in the casing.

Abstract: An exhaust gas purification system includes an exhaust purifying element for purifying exhaust gas, and a selective reduction catalyst for promoting reduction of NOx contained in the exhaust gas with a reducing agent. A housing for accommodating the exhaust purifying element includes an outer wall having an accommodating portion. A supply hole is formed on a bottom of the accommodating portion. A pipe that is located inside the housing has a passage through which an interior of the pipe communicates with an exterior of the pipe. The pipe is configured to guide exhaust gas toward the selective reduction catalyst through the passage and the interior of the pipe. The pipe has an end communicating with the supply hole. The injection device of the exhaust gas purification system injects the reducing agent to an interior of the pipe through the supply hole.

Abstract: Provided is a support structure for a particulate filter stored inside and properly detachable and attachable, which is low in manufacturing cost, hardly causes stress concentration and readily prevents interference with peripheral devices. Concerned is a support structure for a muffler 11 with the particulate filter 6 stored inside, the muffler 11 being divided at positions in front of and behind the portion for storage of the filter into portions, the divided portions being detachably fastened together through flanges 12a, 13a and 14a. Brackets 15 and 16 for suspension and support of the muffler 11 from and by a frame 9 (vehicle body) are fitted by fastening the brackets together upon fastening of the flanges 12a and 13a and the flanges 13a and 14a.