Abstract: [Problem to be Solved] To enhance the performance for separation of oil mist from blow-by gas. [Solution] A filter element 13 which is to be attached to an oil separator unit 3 includes a core 31. This core is a double tube having an internal cylindrical member 34 and an external cylindrical member 35, and a space between the internal cylindrical member and the external cylindrical member is used as a separation chamber 36. An injection hole 39 for injecting blow-by gas while increasing its flow velocity is provided in the internal cylindrical member. A surface which is an inner wall surface of the external cylindrical member and which faces the injection hole is a spraying surface onto which the blow-by gas injected from the injection hole is sprayed. Moreover, an opening for oil discharge from which oil OL condensed on the spraying surface is discharged, and an opening for discharge from which the blow-by gas from which oil mist has been separated is discharged are provided in the core.

Abstract: An exhaust emission control device, which can absorb thermal expansion difference between a particulate filter and a selective reduction catalyst without causing urea deposition, has the filter and the catalyst arranged in parallel with each other with their entry ends facing the same direction. An S-shaped communication passage is provided to introduce the exhaust gas from a discharge end of the filter into an entry end of the catalyst through turndown, urea water being added upstream of the communication passage. A mixing pipe providing a straight section of the communication passage at an intermediate portion thereof, with a double-pipe portion constituted by overlapped stretchable/retractable inner and outer pipes, the outer pipe having a terminal end secured to an outer periphery of the inner pipe and being provided with an axially expansible and contractible bellows, a sealing ring fitted over an outer periphery of a terminal end of the inner pipe.

Abstract: The present invention aims to provide a muffling structure of a vent pipe and a muffling structure of a case, which is capable of muffling in a wide frequency range and preventing vent resistance in the air pipe or the case from deterioration. Vent holes (11a) are formed in the peripheral wall of the vent pipe (11), a cover (12) is so provided on the peripheral wall of the vent pipe (11) as to cover the vent holes (!1a), and a bag-like body (13) in which activated charcoal (14) is contained is disposed in the space formed by the peripheral wall of the vent pipe (11) and the inner wall of the cover (12).

Abstract: In a plate laminate type heat exchanger a plurality of groove-like protrusions is formed on one side of each of flat core plates, and the protrusions extend substantially in parallel to one another from one end side in the longitudinal direction of the plate toward the other end side in the longitudinal direction of the plate, form a U-turn region in an area on the other end side in the longitudinal direction of the plate, and return to the one end side in the longitudinal direction of the plate. The plate is curved in such a way that ridges and valleys are formed on part of the plate, the area in which the protrusions are formed but the U-turn region is not formed, in the direction in which the plate is laminated and the ridges and valleys are repeated along the longitudinal direction. Both ends of each of the protrusions converge into an inlet port for high temperature fluid and an outlet port for high temperature fluid, respectively.

Abstract: An object of the present invention is to provide a process for producing a catalyst for exhaust gas purification capable of increasing the area brought into contact with exhaust gas to improve the exhaust gas purification efficiency without decrease in strength of the catalyst for exhaust gas purification and without significant increase in manufacturing cost of the catalyst for exhaust gas purification. The present invention provides a process for producing a catalyst for exhaust gas purification formed by forming a coating layer containing a catalyst component on a honeycomb support, characterized in that the method comprises immersing the honeycomb support in a thixotropic slurry containing the catalyst component or sucking the slurry into the honeycomb support, removing the honeycomb support from the slurry, spraying pulsed air onto an end surface of the removed honeycomb support in the axial direction thereof, and baking the honeycomb support to form the coating layer on the honeycomb support.

Abstract: An exhaust gas pressure P, exhaust gas temperatures TU and TD on upstream and downstream of a DPF, a rotation speed Ne, a load Q, and an intake flow rate F as various operating conditions are read, and an amount of PM generated for short time ?t is obtained to be added to a PM deposited amount m, and thus, to obtain an initial deposited amount. Exhaust gas properties and a space velocity SV are obtained based on various operating conditions, and the PM deposited amount m after a lapse of the short time ?t is estimated from a PM deposited amount estimation equation “m=m·exp(?B·?t)” having been derived considering the exhaust gas properties and the space velocity SV. When the PM deposited amount m is equal to or more than a predetermined value, a forced regeneration processing in the DPF is executed, and thereafter, the PM deposited amount m is reset to 0.

Abstract: An agitating device for agitating the exhaust gas of an engine includes a base plate having a plurality of through holes that are defined by radially extending spoke portions and a ring-like rim portion and are arranged in a circular pattern in a circumferential direction of the base plate, and a plurality of fins expanding from the respective spokes on a slant with respect to the base plate. The base plate is fixed in the exhaust passage by the rim portion being jointed to the exhaust passage at welded portions. The welded portions are each disposed in an area between respective two adjacent spoke portions in the circumferential direction of the base plate, and an outer edge of the rim portion positioned on the outer side of the rim portion in extending directions of the spoke portions is located next to the exhaust passage with a gap provided therebetween.

Abstract: Provided is a method for performing maintenance of a particulate which can reliably remove combustion residue by means of backwash air without use of hot water and the like while cutting equipment expenses, so that substantial increase in exhaust pressure and deterioration of fuel economy during operation can be prevented. When maintenance of the particulate filter 4 is to be performed, a filler 13 is filled to each of passages 8 with outlets unplugged with plugs 9 so as to reduce an inner volume of the passage 8, and then backwash air 12 is blown into the passages 8 with the unplugged outlets.

Abstract: An object of the present invention is to provide a plate stacking type heat exchanger including plates having a small longitudinal dimension. In a plate stacking type heat exchanger 100 according to the present invention, an inlet port for low temperature fluid 59a and an outlet port for low temperature fluid 59b are provided on one end side in the longitudinal direction of a plate (left side in FIG. 1). A partition part formed of partition members 10a and 10b is formed in each low temperature fluid compartment 60. The low temperature fluid flows each of the low temperature fluid compartments 60 along a U-turn path that is not short in length.

Abstract: An exhaust emission control device is provided which can reliably absorb thermal expansion difference between a particulate filter and a selective reduction catalyst without causing deposition of urea. The exhaust emission control device has a particulate filter 5 and a selective reduction catalyst arranged in parallel with each other in such a manner that entry ends of them are directed to the same direction, an S-shaped communication passage 9 being provided for introduction of the exhaust gas 3 discharged from the discharge end of the particulate filter into an entry end of the adjacent selective reduction catalyst through turndown, urea water being addible upstream of the communication passage 9.

Abstract: An exhaust emission purifying apparatus has a NOx reduction catalytic converter in an exhaust passage of an engine, for purifying nitrogen oxides in the exhaust gas by reduction with urea aqueous solution; an injection nozzle injecting the urea solution toward an exhaust upstream side of the converter in the exhaust passage; and fins disposed on an exhaust upstream side of an injection position of the urea solution in the injection nozzle, for generating a spiral swirling flow of the gas swirling about a center corresponding to the central axis of an exhaust pipe. The swirling flow generated in the exhaust gas prior to the injection-supply of the urea aqueous solution promotes mixing of the solution with the gas to thereby promote the hydrolysis of the urea solution. And the exhaust gas and ammonia generated from the urea solution are uniformly mixed together.

Abstract: Problem to be Solved A plate laminate type heat exchanger having high heat exchange efficiency is provided. Solution In a plate laminate type heat exchanger 100, a plurality of groove-like protrusions 10 is formed on one side of each of flat core plates 53 and 54, and the protrusions 10 extend substantially in parallel to one another from one end side in the longitudinal direction of the plate toward the other end side in the longitudinal direction of the plate, form a U-turn region in an area on the other end side in the longitudinal direction of the plate, and return to the one end side in the longitudinal direction of the plate. The plate is curved in such a way that ridges and valleys are formed on part of the plate, the area in which the protrusions 10 are formed but the U-turn region is not formed, in the direction in which the plate is laminated and the ridges and valleys are repeated along the longitudinal direction.

Abstract: Problem to be Solved A plate laminate type heat exchanger having high heat exchange efficiency is provided. Solution In a plate laminate type heat exchanger 100, both ends of a protrusion 10 converge into an inlet port for high temperature fluid 58a and an outlet port for high temperature fluid 58b. A pair of core plates 53 and 54 is assembled in such a way that the side of the core plate 53 on which the protrusion 10 is not formed faces the side of the core plate 54 on which the protrusion 10 is not formed and the protrusions 10 and 10 formed on the respective core plates are paired but oriented in opposite directions. The pair of core plates 53 and 54 form a plurality of tubes surrounded by the walls of the protrusions 10 and 10, and the tubes form high temperature fluid compartments.

Abstract: Provided in a catalyst system are: a first reaction part fitted with a first catalyst containing, as active constituents, at least, a complex oxide consisting of two or more oxides selected from among silica, alumina, titania, zirconia, and tungsten oxide, and a rare earth metal or transition metal (except Cu, Co, Ni, Mn, Cr, and V); and a second reaction part fitted with a second catalyst containing, as active constituents, at least, a noble metal and a silica-alumina type complex oxide.

Abstract: Provided is a method for performing maintenance of a particulate which can reliably remove combustion residue by means of backwash air without use of hot water and the like while cutting equipment expenses, so that substantial increase in exhaust pressure and deterioration of fuel economy during operation can be prevented. When maintenance of the particulate filter 4 is to be performed, a filler 13 is filled to each of passages 8 with outlets unplugged with plugs 9 so as to reduce an inner volume of the passage 8, and then backwash air 12 is blown into the passages 8 with the unplugged outlets.

Abstract: The flow of exhaust gas flowing through the SCR muffler becomes good, thus improving the efficiency of purging nitrogen oxide (NOx) contained in exhaust gas. Further, vibrations that are caused by vibrations of the vehicle, exhaust gas, and the like, to which a reducing agent, etc., supplying nozzle is subject, are suppressed or reduced, thus improving the efficiency of an SCR catalyst purging nitrogen oxide (NOx) and the durability of the reducing agent, etc., supplying nozzle. The SCR muffler comprises an SCR catalyst 1 for selectively reducing and purging nitrogen oxide (NOx) contained in exhaust gas; an exhaust pipe 2 that allows the exhaust gas to flow into the SCR catalyst; and a reducing agent, etc., supplying means 3 that supplies a reducing agent or a reducing agent precursor to the exhaust gas. A plate 4 having air holes 5 which disperse and make a flow of the exhaust gas uniform is provided downstream of the reducing agent, etc., supplying means and upstream of the SCR catalyst.

Abstract: An agitating device for agitating the exhaust gas of an engine includes a base plate having a plurality of through holes that are defined by radially extending spoke portions and a ring-like rim portion and are arranged in a circular pattern in a circumferential direction of the base plate, and a plurality of fins expanding from the respective spokes on a slant with respect to the base plate. The base plate is fixed in the exhaust passage by the rim portion being jointed to the exhaust passage at welded portions. The welded portions are each disposed in an area between respective two adjacent spoke portions in the circumferential direction of the base plate, and an outer edge of the rim portion positioned on the outer side of the rim portion in extending directions of the spoke portions is located next to the exhaust passage with a gap provided therebetween.

Abstract: A muffling apparatus 1 of the present invention having an exhaust emission purifying function, including a turning portion 8 in an inside of an exhaust gas flow passage, and having an injection nozzle 12 disposed in an upstream side exhaust gas flow passage 9 of the turning portion 8, for injection-supplying a liquid reducing agent; and a reduction catalytic converter 13 disposed in a downstream side exhaust gas flow passage 10 of the turning portion 8, for reductively purifying nitrogen oxides with the liquid reducing agent. The apparatus further includes a diffusing member 15, which generates a vortex flow of a gas traveling in a vertical plane of the turning portion 8 to diffuse the liquid reducing agent.

Abstract: A reduction catalyst is disposed in an exhaust passage of an engine. A reducing agent added to the exhaust gas is urged to react with NOx in the exhaust gas, catalyzed by the reduction catalyst. A member for distributing the exhaust gas to which the reducing agent has been added is provided. This member is formed by applying of an axial welding and is disposed in the exhaust passage such that the internal surface of its joining portion is disposed to overhang from the topmost position of the joining portion.

Abstract: An HC filter (10) for use in an air cleaner (200) comprises an absorbent that absorbs hydrocarbon (HC) contained in vaporized fuel and a support that supports the absorbent. The support is of a paper honeycomb structure and has a surface thereof coated. An HC filter fixing frame (20) for attaching the HC filter in the housing of the air cleaner comprises a frame-like body (21) and a lattice (22). The lattice (22) is placed so as not to contact the HC filter (10), and bosses (30) are provided on the side of the lattice facing the HC filter, which contact and hold the HC filter at a side thereof. In the air cleaner (200), an HC filter unit (100) consisting of the HC filter (10) and the HC filter fixing frame (20) can be situated over the entire cross-section of the passage at a position adjacent to sealing faces.