JP2016217211A - Engine device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent condensate water from accumulating in sensor piping connected to a DPF.SOLUTION: An engine 5 comprises: an exhaust gas purification device 52; a differential pressure sensor 192; and sensor piping 188 which communicates an interior space of the exhaust gas purification device 52 with the differential pressure sensor 192. The exhaust gas purification device 52 has: a gas purification housing 168 which is substantially cylindrical in shape and allows exhaust gas to pass therethrough; and an exhaust gas inlet pipe 161 installed on an outer peripheral face of the gas purification housing 168. The exhaust gas purification device 52 is installed above the engine 5 in an inclined posture so that a central axis of the gas purification housing 168, when viewed from an inlet side edge section of the exhaust gas inlet pipe 161, is inclined toward an inner side of the engine 5 from a vertical position. A position where the sensor piping 188 is connected to the gas purification housing 168 is not lower than a horizontal plane including the central axis of the gas purification housing 168.SELECTED DRAWING: Figure 11

Description

  The present invention relates to an engine device used in a work vehicle such as a tractor for agricultural work or a wheel loader for civil engineering work.

  Exhaust gas that purifies air pollutants in exhaust gas in agricultural vehicles and construction civil engineering machinery equipped with the engine in accordance with the recent high-level exhaust gas regulations related to diesel engines (hereinafter simply referred to as engines) It is required to install a purification device. As an exhaust gas purifying device, a diesel particulate filter (hereinafter referred to as DPF) that collects particulate matter or the like in exhaust gas is known.

  And in order to grasp the clogged state of the filter (soot filter etc.) in the DPF, the pressure difference of the exhaust gas between the upstream side and the downstream side across the filter is detected by a differential pressure sensor, and it is appropriately determined according to the detection result. In addition, an engine apparatus is known that performs control to regenerate the filter by increasing the temperature of the exhaust gas in the DPF (see, for example, Patent Document 1).

JP, 2014-013026, A

  By the way, when installing DPF in the upper part of an engine apparatus like the engine apparatus of patent document 1, in order to save an engine room more space, DPF (I.e., installed so that the position of the substantially cylindrical gas purification housing of the DPF as viewed from the inlet end of the DPF is closer to the inside of the engine device than directly above). Conceivable.

  However, in the engine device of Patent Document 1, when the DPF is installed in the above-described posture, there are the following problems.

  That is, in the engine device of Patent Document 1, the connection position of the sensor pipe of the differential pressure sensor with respect to the gas purification housing of the DPF is substantially horizontal when viewed from the central axis of the gas purification housing. When such a DPF is disposed in the above-described posture (that is, a posture inclined toward the inside of the engine device), the connection position of the sensor pipe with respect to the gas purification housing is from the horizontal direction when viewed from the central axis of the gas purification housing. Also goes down. As a result, the condensed water generated in the sensor pipe and the condensed water generated in the gas purification housing and entering the sensor pipe are accumulated in the sensor pipe, so that the sensor pipe and the differential pressure sensor are rusted or corroded. The problem of doing it occurs.

  This invention makes it a technical subject to provide the engine apparatus which examined and improved the above present condition.

  The invention according to claim 1 is an engine device mounted on a work vehicle, the exhaust gas purification device installed on the engine device, and the pressure sensor for measuring the pressure of the exhaust gas in the exhaust gas purification device And a sensor pipe that communicates the internal space of the exhaust gas purifying device and the pressure sensor, the exhaust gas purifying device being provided on the outer peripheral surface of the housing, and a substantially cylindrical housing that allows the exhaust gas to pass therethrough. The exhaust gas purifying device is configured such that the central axis of the housing is closer to the inside of the engine device than directly above when viewed from the inlet side end of the exhaust gas inlet tube. The sensor pipe is connected to the housing at a position that is higher than the horizontal direction when viewed from the central axis of the housing. It is characterized in.

  According to a second aspect of the present invention, in the engine device according to the first aspect, the connection position of the sensor pipe to the housing is a horizontal position when viewed from the central axis of the housing. .

  According to a third aspect of the present invention, in the engine device according to the first or second aspect, the connection position of the sensor pipe with respect to the housing is a position closer to the inside of the engine device. .

  The invention according to claim 4 is the engine device according to any one of claims 1 to 3, further comprising a bracket for fixing and supporting the exhaust gas purification device on an upper portion of the engine device. A convex portion is formed on one of the device and the bracket, and a concave portion corresponding to the convex portion is formed on the other of the exhaust gas purification device and the bracket, and the convex portion is formed on the concave portion. The exhaust gas purifying device can be temporarily fixed to the bracket by fitting.

  According to a fifth aspect of the present invention, in the engine device according to any one of the first to fourth aspects, the exhaust gas inlet pipe has a divergent shape from the inlet side end of the exhaust gas inlet pipe toward the housing. The surface of the tube wall closer to the outside of the engine device is substantially parallel to the vertical direction.

  According to the first aspect of the present invention, the exhaust gas purifying device is configured so that the central axis of the substantially cylindrical housing that allows the exhaust gas to pass through is seen from the inlet side end of the exhaust gas inlet pipe of the engine device more than directly above. Condensed water generated in the sensor pipe is installed on the upper part of the engine device in an inclined posture that is closer to the inside, and the connection position of the sensor pipe to the housing is higher than the horizontal direction when viewed from the central axis of the housing. In addition, it is possible to suppress the condensed water generated in the housing and entering the sensor pipe from being accumulated in the sensor pipe. Therefore, the sensor pipe and the pressure sensor can be prevented from being rusted or corroded, and the durability of the sensor pipe and the pressure sensor can be improved.

  According to the invention of claim 2, since the connection position of the sensor pipe with respect to the housing is a horizontal position when viewed from the central axis of the housing, the sensor pipe can be prevented from projecting upward from the engine device. The height of the room can be reduced.

  According to the invention of claim 3, since the connection position of the sensor pipe with respect to the housing is a position closer to the inside of the engine apparatus, it is possible to avoid the sensor pipe from projecting to the outside of the engine apparatus, and to reduce the width of the engine room. Can be suppressed.

  According to the fourth aspect of the present invention, the convex portion formed on one of the exhaust gas purification device and the bracket is fitted into the concave portion formed on the other of the exhaust gas purification device and the bracket, whereby the exhaust gas purification device is bracketed. Therefore, the mounting position of the exhaust gas purification device relative to the engine device can be easily positioned, and the worker who performs the assembly work can release both hands from the exhaust gas purification device in the temporarily fixed state. It will be. Therefore, it is not necessary to perform assembly work such as bolt tightening or removal work while supporting the entire weight of the exhaust gas purification apparatus, and during the loading and unloading work of the exhaust gas purification apparatus or during assembly and disassembly work of the exhaust gas purification apparatus The time and effort can be greatly reduced.

  According to the invention of claim 5, the exhaust gas inlet pipe has a pipe wall that is divergent from the inlet side end of the exhaust gas inlet pipe toward the housing, and the engine device of the pipe walls Because the surface near the outside is substantially parallel to the vertical direction, even if a large force acts on the exhaust gas inlet pipe in the vertical direction due to the gravity of the housing or the vertical vibration of the work vehicle. Further, deformation and breakage of the exhaust gas inlet pipe can be prevented, and the exhaust gas purification device can be supported with high rigidity.

It is a left view of a tractor. It is a left view of an engine. It is a right view of an engine. It is a top view of an engine. It is a front view of an engine. It is a rear view of an engine. It is a rear perspective view of an engine. It is a front perspective view of an engine. It is a back perspective view of DPF. It is a back perspective view which shows the connection position of the various sensors to DPF. It is sectional drawing which looked at DPF from the back. It is a disassembled perspective view of the support bracket seen from the exhaust inlet side of DPF. It is a disassembled perspective view of the support bracket seen from the exhaust outlet side of DPF.

  DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments embodying the present invention are described below with reference to the drawings, taking a tractor that is a work vehicle as an example.

  First, an outline of a tractor will be described with reference to FIG. The traveling machine body 2 of the tractor 1 is supported by a pair of left and right front wheels 3 and a rear wheel 4. The tractor 1 is configured to travel forward and backward by driving the rear wheels 4 (front wheels 3) with a diesel engine 5 (hereinafter simply referred to as an engine) mounted on the front portion of the traveling machine body 2. The engine 5 is covered with a bonnet 6. A cabin 7 is installed on the upper surface of the traveling machine body 2, and a steering seat 8 and a steering handle 9 for steering the front wheel 3 are arranged inside the cabin 7. A fuel tank 11 for supplying fuel to the engine 5 is provided below the bottom of the cabin 7.

  The traveling machine body 2 includes an engine frame 14 provided with a front bumper 12 and a front axle case (not shown), and left and right machine body frame frames 16 fixed to the rear part of the engine frame 14. A mission case (not shown) is mounted on the rear portion of the fuselage body frame 16 for appropriately changing the rotational power from the engine 5 and transmitting it to the rear wheels 4 (front wheels 3). The rear wheel 4 is attached to the mission case via a rear axle case (not shown) mounted so as to protrude outward from the outer surface of the mission case. Upper portions of the left and right rear wheels 4 are covered with a fender 19 fixed to the fuselage body frame 16.

  Although not shown, a hydraulic lifting mechanism for lifting and lowering a rotary tiller as a working unit is detachably attached to the rear upper surface of the mission case. The rotary cultivator is connected to the rear part of the transmission case via a two-point link mechanism. On the rear side surface of the transmission case, a PTO shaft for transmitting a PTO driving force to the rotary tiller is projected rearward.

  The schematic structure of the common rail type diesel engine 5 mounted on the work vehicle will be described with reference to FIGS. In the following description, both sides along the output shaft 53 (both sides sandwiching the output shaft 53) are left and right, the cooling fan 59 arrangement side is the front side, the flywheel 61 arrangement side is the rear side, and the exhaust manifold 57 arrangement side is The left side and the side on which the intake manifold 56 is arranged are referred to as the right side, and these are used as a reference for the positional relationship between the four sides and the top and bottom in the diesel engine 5 for convenience.

  As shown in FIGS. 2 to 8, the diesel engine 5 as a prime mover mounted on a work vehicle such as a tractor includes a continuous regeneration type exhaust gas purification device (DPF) 52. The exhaust gas purification device 52 removes particulate matter (PM) in the exhaust gas discharged from the diesel engine 5 and reduces carbon monoxide (CO) and hydrocarbons (HC) in the exhaust gas. .

  The diesel engine 5 includes a cylinder block 54 that incorporates an output shaft 53 (crankshaft) and a piston (not shown). A cylinder head 55 is mounted on the cylinder block 54. An intake manifold 56 is disposed on the right side surface of the cylinder head 55. An exhaust manifold 57 is disposed on the left side surface of the cylinder head 55. That is, in the diesel engine 5, the intake manifold 56 and the exhaust manifold 57 are distributed and arranged on both side surfaces along the output shaft 53. A head cover 58 is disposed on the upper surface of the cylinder head 55. A cooling fan 59 is provided on one side of the diesel engine 5 that intersects with the output shaft 53, specifically on the front surface of the cylinder block 54. Rotational power is transmitted from the front end side of the output shaft 53 to the cooling fan 59 via the cooling fan V-belt 72.

  A flywheel housing 60 is provided on the rear surface of the cylinder block 54. A flywheel 61 is disposed in the flywheel housing 60. A flywheel 61 is pivotally supported on the rear end side of the output shaft 53. The power of the diesel engine 5 is taken out via the output shaft 53 to the working part of the work vehicle. An oil pan 62 is disposed on the lower surface of the cylinder block 54. Lubricating oil in the oil pan 62 is supplied to each lubricating portion of the diesel engine 5 through an oil filter 63 disposed on the right side surface of the cylinder block 54.

  A fuel supply pump 64 for supplying fuel is mounted on the right side surface of the cylinder block 54 above the oil filter 63 (below the intake manifold 56). A four-cylinder injector 65 with an electromagnetic opening / closing control type fuel injection valve is provided in the diesel engine 5. A fuel tank 11 (see FIG. 1) mounted on the work vehicle is connected to each injector 65 via a fuel supply pump 64, a cylindrical common rail 66, and a fuel filter 67.

  The fuel in the fuel tank 11 is pumped from the fuel supply pump 64 to the common rail 66 through the fuel filter 67, and high-pressure fuel is stored in the common rail 66. By controlling the fuel injection valve of each injector 65 to open and close, the high-pressure fuel in the common rail 66 is injected from each injector 65 to each cylinder of the diesel engine 5. An engine starter 68 is provided in the flywheel housing 60. The pinion gear of the starter 68 for engine start meshes with the ring gear of the flywheel 61. When the diesel engine 5 is started, the output shaft 53 starts to rotate (so-called cranking is executed) by rotating the ring gear of the flywheel 61 with the rotational force of the starter 68.

  On the front side of the cylinder head 55 (on the cooling fan 59 side), a cooling water pump 71 for lubricating lubricating water is disposed coaxially with the fan shaft of the cooling fan 59. The cooling water pump 71 is configured to be driven together with the cooling fan 59 by the rotation of the engine output shaft 53. Cooling water in a radiator (not shown) mounted on the tractor 1 is supplied to the cooling water pump 71 via a thermostat case 70 provided on the upper part of the cooling water pump 71. Then, when the cooling water pump 71 is driven, cooling water is supplied to a water cooling jacket (not shown) formed in the cylinder head 55 and the cylinder block 54 to cool the diesel engine 5. The cooling water that has contributed to the cooling of the diesel engine 5 is returned to the radiator. Further, the cooling water pump 71 faces the cooling fan 59 in the positional relationship, and the cooling air from the cooling fan 59 strikes the cooling water pump 71.

  On the left side of the diesel engine 5, specifically, on the left side of the cooling water pump 71, an alternator 73 is provided as a generator that generates power using the power of the diesel engine 5. Rotational power is transmitted from the front end side of the output shaft 53 to the cooling fan 59, the cooling water pump 71, and the alternator 73 via the cooling fan V-belt 72.

  Engine leg mounting portions 74 are provided on the left and right side surfaces of the cylinder block 54, respectively. Each engine leg mounting portion 74 can be bolted to a front engine leg (engine mount) having vibration-proof rubber. In the embodiment, the engine leg mounting portions 74 on the cylinder block 54 side are bolted to the engine frames 14 via the engine legs so that the cylinder block 54 is sandwiched between the pair of left and right engine frames 14 (see FIG. 1) in the work vehicle. Conclude. Thereby, both engine frames 14 of the work vehicle support the diesel engine 5 front side.

  An intake communication pipe 76 to which fresh air (external air) is supplied is connected to the rear inlet portion of the intake manifold 56, and an intake throttle member 77 is provided on the intake inlet side (upstream side) of the intake communication pipe 76. Yes. Further, a recirculation exhaust gas pipe 78 to which a part of exhaust gas (EGR gas) of the diesel engine 5 is supplied is connected to an upper surface inlet portion of the intake manifold 56 through an EGR valve member 79. In the intake manifold 56, the intake outlet side (downstream side) of the intake communication pipe 76 and the connection part (rear part) with the EGR valve member 79 are configured as a main body case of the EGR device (exhaust gas recirculation device) 75. Yes. In other words, the intake intake side of the intake manifold 56 constitutes an EGR main body case.

  The EGR device 75 is mainly located on the right side of the diesel engine 5, specifically, on the right side of the cylinder head 55. The EGR device 75 mixes a part of exhaust gas (EGR gas) of the diesel engine 5 with fresh air and takes in the air. Supply to manifold 56. The EGR device 75 includes an EGR main body case constituted by a part of the intake manifold 56, an intake communication pipe 76 communicating with the intake manifold 56, an intake throttle member 77 provided in the intake communication pipe 76, and an EGR cooler in the exhaust manifold 57. A recirculation exhaust gas pipe 78 connected via 80 and an EGR valve member 79 for communicating the intake manifold 56 with the recirculation exhaust gas pipe 78 are provided.

  An intake throttle member 77 is connected to the intake intake side of the intake manifold 56 via an intake communication pipe 76. An air cleaner (not shown) is connected to the intake throttle member 77 via a relay pipe (not shown). That is, fresh air (external air) removed by the air cleaner is supplied to the intake intake side of the intake manifold 56 through the intake throttle member 77. The outlet side of the recirculated exhaust gas pipe 78 is also connected to the intake intake side of the intake manifold 56 via an EGR valve member 79. The inlet side of the recirculation exhaust gas pipe 78 is connected to the exhaust manifold 57 via the EGR cooler 80. By adjusting the opening degree of the EGR valve in the EGR valve member 79, the supply amount of EGR gas to the intake intake side of the intake manifold 56 is adjusted.

  In the above configuration, fresh air is supplied to the intake manifold 56 via the intake communication pipe 76 and the intake throttle member 77, while EGR gas is supplied from the exhaust manifold 57 to the intake manifold 56. Fresh air from the outside and EGR gas from the exhaust manifold 57 are mixed on the intake intake side of the intake manifold 56. By recirculating a part of the exhaust gas discharged from the diesel engine 5 to the exhaust manifold 57 from the intake manifold 56 to the diesel engine 5, the maximum combustion temperature at the time of high load operation is lowered, and NOx (nitrogen from the diesel engine 5 is reduced. Oxide emissions are reduced.

  An exhaust gas purification device 52 is disposed above the exhaust manifold 57 on the upper surface side of the diesel engine 5, that is, above the exhaust manifold 57 on the left side of the cylinder head 55. In this case, the attitude of the exhaust gas purification device 52 is set so that the longitudinal direction of the exhaust gas purification device 52 extends in parallel with the output shaft 53 of the diesel engine 5. The upper outlet of the exhaust manifold 57 is connected to the exhaust intake side of the exhaust gas purification device 52. That is, the exhaust gas discharged from each cylinder of the diesel engine 5 to the exhaust manifold 57 is discharged to the outside via the exhaust gas purification device 52 and the like.

  The exhaust gas purification device (DPF) 52 is for collecting particulate matter (PM) and the like in the exhaust gas. The DPF 52 is configured in a substantially cylindrical shape extending in the front-rear direction in parallel with the output shaft (crankshaft) 53 of the diesel engine 5. A DPF 52 is disposed above the cylinder head 55 of the diesel engine 5. An exhaust gas inlet pipe 161 (exhaust gas intake side) and an exhaust gas outlet pipe 162 (exhaust gas discharge side) are connected to both sides of the DPF 52 (one end side and the other end side in the exhaust gas movement direction) of the diesel engine 5. Distribute before and after.

  The DPF 52 has a structure in which, for example, a diesel oxidation catalyst such as platinum and a soot filter having a honeycomb structure are arranged in series and accommodated therein. In the above configuration, nitrogen dioxide (NO2) generated by the oxidation action of the diesel oxidation catalyst is taken into the soot filter. Particulate matter contained in the exhaust gas of the diesel engine 5 is collected by a soot filter and continuously oxidized and removed by nitrogen dioxide (NO 2). Therefore, in addition to the removal of particulate matter (PM) in the exhaust gas of the diesel engine 5, the content of carbon monoxide (CO) and hydrocarbon (HC) in the exhaust gas of the engine 5 is reduced.

  The DPF 52 includes an upstream case 165 having an exhaust gas inlet pipe 161 on its outer peripheral surface, an intermediate case 166 connected to the upstream case 165, and a downstream case 167 into which the exhaust gas outlet pipe 162 is inserted from the outer peripheral surface. Prepare. An upstream case 165 and an intermediate case 166 are connected in series to constitute a gas purification housing 168 made of a heat-resistant metal material. The gas purification housing 168 accommodates a diesel oxidation catalyst and a soot filter via a cylindrical inner case (not shown). In addition, the downstream case 167 includes an inner case (not shown) in which a number of silencer holes are opened, and a silencer made of ceramic fiber is filled between the inner case and the silencer to form a silencer. ing.

  The upstream case 165 has one end that is upstream in the exhaust gas movement direction covered with an upstream lid 169 and the other end that is downstream in the exhaust gas movement is open, and the exhaust gas movement direction It has a cylindrical shape with an opening on the downstream side. The intermediate case 166 has a cylindrical shape with both ends opened. The downstream case 167 opens one end that is upstream in the exhaust gas movement direction, and covers the other end that is downstream in the exhaust gas movement direction with a downstream lid 174, and is upstream in the exhaust gas movement direction. It is comprised by the cylindrical shape which opened. An exhaust pipe (not shown) is connected to the exhaust gas outlet pipe 162 provided on the outer peripheral surface of the downstream case 167, and exhaust gas is discharged from the exhaust gas outlet pipe 162 to the outside through the exhaust pipe.

  An exhaust gas inlet pipe 161 is provided on the outer peripheral portion of the upstream case 165 on the exhaust intake side (exhaust inlet side), and the exhaust intake side of the exhaust gas inlet pipe 161 is connected to the exhaust manifold 57. The exhaust manifold 57 is bolted to the left side surface of the cylinder head 55 and supplies the exhaust gas discharged from each cylinder of the engine 5 to the exhaust gas purification device 52 and the EGR cooler 80.

  As shown in FIG. 9, an exhaust gas inflow port 165a is opened in the left side region at the lower part of the outer peripheral portion of the upstream case 165 on the exhaust intake side (exhaust inlet side). An exhaust gas inlet pipe 161 is disposed on the outer surface of the upstream case 165 where the exhaust gas inlet 165a is formed. The exhaust gas inlet pipe 161 is formed in a half-cylinder shape that opens obliquely upward, and a rectangular upward opening end portion 161 a that is a large diameter side covers the exhaust gas inlet 165 a and is the longitudinal length of the upstream case 165. It is welded and fixed to the outer surface of the upstream case 165 so as to extend in the (front-rear) direction. Therefore, the upward opening end portion 161 a on the exhaust gas outlet side of the exhaust gas inlet pipe 161 is connected to the exhaust gas inlet 165 a of the upstream case 165. The exhaust gas inlet pipe 161 has a small-diameter, circular-shaped downward opening end portion 161b opened at the front end portion of the upstream case 165 near the middle of the longitudinal direction as the exhaust gas inlet side. An inlet flange body 161c is welded and fixed to the outer peripheral portion of the downward opening end portion 161b. The inlet flange body 161c is detachably bolted to the exhaust gas discharge side of the exhaust manifold 57. In the exhaust gas purification device 52, the exhaust gas inlet pipe 161 is inclined toward the outside of the engine 5 toward the lower side (the inlet flange body 161c side).

  The rear end side of the exhaust gas inlet pipe 161 covers the exhaust gas inlet 165a of the upstream case 165 from the outside. A downward opening end portion 161 b as an exhaust gas inlet side is formed at the front end portion of the exhaust gas inlet pipe 161. That is, the downward opening end portion 161b of the exhaust gas inlet pipe 161 with respect to the exhaust gas inlet port 165a is offset from the exhaust gas downstream side in the gas purification housing 168 (positioned on the front side of the upstream case 165). Are provided in a staggered manner). The upward opening end 161a of the exhaust gas inlet pipe 161 is welded and fixed to the outer surface of the upstream case 165 so as to cover the exhaust gas inlet 165a and extend in the longitudinal (front-rear) direction of the upstream case 165. Yes. For this reason, an exhaust gas introduction passage is formed by the outer side surface of the upstream case 165 and the inner side surface of the pipe wall 161d of the exhaust gas inlet pipe 161.

  As a result, the gas purification housing 168 (upstream side case 165) can be heated by the exhaust gas in the exhaust gas inlet pipe 161 (inside the introduction passage), and the exhaust gas temperature passing through the gas purification housing 168 (upstream side case 165). Can be suppressed. Therefore, the exhaust gas purification performance of the exhaust gas purification device 52 can be improved. Further, the exhaust gas inlet pipe 161 can be used as a strength member of the gas purification housing 168 (upstream side case 165), and the gas purification housing 168 (upstream side case 165) can be made thick without increasing the number of parts. The rigidity of the gas purification housing 168 (upstream case 165) can be improved with a simple configuration.

  Further, the pipe wall 161d of the exhaust gas inlet pipe 161 has a divergent shape (a trumpet shape) from the downward opening end portion 161b toward the gas purification housing 168 (upstream side case 165). Specifically, the rear surface of the pipe wall 161d is inclined so as to shift greatly toward the rear side from the downward opening end portion 161b toward the gas purification housing 168 (upstream side case 165). (See FIG. 2). The rear surface of the pipe wall 161d covers the exhaust gas inlet 165a of the gas purification housing 168 (upstream side case 165), and exhaust gas flowing from the exhaust manifold 57 into the exhaust gas inlet pipe 161 is allowed to flow. It is configured to drift in the direction of the exhaust gas inlet 165a.

  In the above configuration, the exhaust gas flowing into the exhaust gas inlet pipe 161 from the exhaust manifold 57 collides with the rear surface of the exhaust gas inlet pipe 161 and drifts toward the exhaust gas inlet 165a, and the exhaust gas inlet It is guided smoothly into the gas purification housing 168 (upstream case 165) via 165a. That is, the rear surface of the exhaust gas inlet pipe 161 is used as a guide surface for sending exhaust gas to the exhaust gas inlet 165a, and the exhaust gas inlet pipe 161 is used as a strength member of the gas purification housing 168 (upstream side case 165). Available.

  As a result, the rigidity of the gas purification housing 168 (upstream side case 165) can be improved with a simple configuration without increasing the thickness of the gas purification housing 168 (upstream side case 165) or increasing the number of parts extremely. However, the exhaust gas from the exhaust manifold 57 can be smoothly guided into the gas purification housing 168 (upstream case 165) by the inner surface of the rear surface of the exhaust gas inlet pipe 161. Therefore, exhaust gas can be supplied to a wide area of the diesel oxidation catalyst which is a gas purification body in the gas purification housing 168 (upstream side case 165), which contributes to efficient use of the diesel oxidation catalyst.

  On the other hand, the front surface (that is, the portion near the exhaust gas outlet pipe 162) of the pipe wall 161d of the exhaust gas inlet pipe 161 is directed from the downward opening end portion 161b toward the gas purification housing 168 (upstream side case 165). Accordingly, it is inclined so as to shift slightly forward (see FIG. 2). With this configuration, the exhaust gas collides with the outer surface of the gas purification housing 168 (upstream side case 165) in the portion of the exhaust gas inlet pipe 161 near the exhaust gas outlet pipe 162. Is secured. Therefore, a swirl flow or a turbulent flow can be formed, and the exhaust gas can be evenly supplied to the diesel oxidation catalyst more reliably.

  Further, the right side surface of the pipe wall 161d of the exhaust gas inlet pipe 161 (that is, the portion near the head cover 58) is on the right side from the downward opening end portion 161b toward the gas purification housing 168 (upstream side case 165). (See FIG. 6). Further, the left side surface of the tube wall 161d of the exhaust gas inlet pipe 161 is inclined so as to shift to the left side from the downward opening end portion 161b toward the gas purification housing 168 (upstream side case 165). (See FIG. 6). That is, the right side surface and the left side surface of the pipe wall 161d of the exhaust gas inlet pipe 161 are inclined so as to be separated from each other toward the gas purification housing 168 (upstream side case 165) from the downward opening end portion 161b. doing. With this configuration, the exhaust gas inside the exhaust gas inlet pipe 161 (inside the introduction passage) can heat the outer surface of the gas purification housing 168 (upstream side case 165) over a wide range, and the gas purification housing 168 (upstream) It is possible to suppress a decrease in the temperature of the exhaust gas passing through the side case 165). Therefore, the exhaust gas purification performance of the exhaust gas purification device 52 can be improved.

  In particular, the left side surface of the pipe wall 161 d of the exhaust gas inlet pipe 161 is substantially parallel to the vertical direction when the exhaust gas inlet pipe 161 is connected to the exhaust manifold 57. Therefore, even if a large force acts on the exhaust gas inlet pipe 161 in the vertical direction due to the gravity of the gas purification housing 168 or the vertical vibration of the tractor 1, the deformation or breakage of the exhaust gas inlet pipe 161 is prevented. The exhaust gas purification device 52 can be supported with high rigidity.

  As shown in FIG. 10, the DPF 52 includes temperature sensors 186 and 187 that detect the temperature of exhaust gas flowing in the gas purification housing 168. The temperature sensors 186 and 187 are, for example, thermistor-type temperature sensors, and have wiring connectors 190 and 191 that are inserted into the gas purification housing 168 and output measurement signals.

  Further, the DPF 52 has sensor pipes 188 and 189 disposed at the front and rear positions of the soot filter of the gas purification housing 168 so that the differential pressure sensor 192 detects the pressure difference between the upstream side and the downstream side across the soot filter. It is connected. The internal space of the exhaust gas purification device 52 and the differential pressure sensor 192 communicate with each other through sensor pipes 188 and 189. The accumulated amount of particulate matter in the soot filter is converted based on the pressure difference detected by the differential pressure sensor 192 so that the clogged state in the DPF 52 can be grasped.

  As shown in FIG. 11, the connection position S of the sensor pipes 188 and 189 with respect to the gas purification housing 168 is substantially horizontal when viewed from the central axis O of the gas purification housing 168. As described above, the exhaust gas purification device 52 inclines the exhaust gas inlet pipe 161 toward the outside of the engine 5 toward the lower side (the inlet flange body 161c side). That is, when viewed from the central axis O, the position of the center point C of the downward opening end portion 161b of the exhaust gas inlet pipe 161 is closer to the outside of the engine 5 than just below. Even when the DPF 52 is installed in such a posture, the angle A of the connection position S and the center point C around the center axis O is determined so that the connection position S is substantially horizontal when viewed from the center axis O. ing. In this embodiment, the angle A is larger than 90 degrees, but when the connection position S is provided on the left side of the gas purification housing 168, the angle A is smaller than 90 degrees.

  With the above configuration, condensed water generated in the sensor pipes 188 and 189 and condensed water generated in the gas purification housing 168 and entering the sensor pipes 188 and 189 are contained in the sensor pipes 188 and 189. It can suppress that it collects in. Therefore, the sensor pipes 188 and 189 and the differential pressure sensor 192 can be prevented from being rusted or corroded, and the durability of the sensor pipes 188 and 189 and the differential pressure sensor 192 can be improved.

  In this embodiment, the connection position S is provided in a substantially horizontal direction when viewed from the central axis O. However, the sensor may be provided by providing the connection position S on the upper side of the substantially horizontal direction when viewed from the central axis O. It is possible to suppress the accumulation of condensed water in the pipes 188 and 189. However, if the connection position S is provided on the upper side of the gas purification housing 168, the sensor pipes 188 and 189 protrude upward, so that when the height of the engine room is to be suppressed, the central shaft is provided as in this embodiment. It is preferable to provide the connection position S in a substantially horizontal direction as viewed from O. Further, if the connection position S is provided on the left side of the gas purification housing 168 (that is, the outside of the engine 5), the sensor pipes 188 and 189 protrude to the outside of the engine 5, so that the width of the engine room is to be suppressed. As in this embodiment, it is preferable to provide the connection position S on the right side of the gas purification housing 168 (that is, inside the engine 5).

  In the present embodiment, the differential pressure sensor 192 is used as the pressure sensor. However, when only one pressure in the gas purification housing 168 (for example, only the pressure upstream of the soot filter) needs to be detected. Only one sensor pipe connected to the pressure sensor needs to be connected to the gas purification housing 168.

  Next, a structure for assembling the exhaust gas purification device 52 to the diesel engine 5 will be described with reference to FIGS. 12 and 13. The diesel engine 5 includes an inlet side bracket body 176, an outlet right side bracket body 177, and an outlet left side bracket 178 as a housing support that supports and fixes the exhaust gas purifying device 52 (gas purification housing 168). The inlet side bracket body 176, the outlet right side bracket body 177 and the outlet left side bracket body 178 are formed wide in the direction intersecting the output shaft 53 of the diesel engine 5. The inlet side bracket body 176, the outlet right side bracket body 177 and the outlet left side bracket 178 are detachably connected to the cylinder head 55 of the diesel engine 5. The inlet side bracket body 176, the outlet right side bracket body 177 and the outlet left side bracket 178 are arranged upright on the front side and the rear side which intersect the output shaft 53 in the cylinder head 55. The inlet side bracket body 176 is located on the rear surface side of the cylinder head 55 and supports the exhaust gas intake side of the gas purification housing 168. The outlet right bracket body 177 and the outlet left bracket 178 are located on the front side of the cylinder head 55 and support the exhaust discharge side of the gas purification housing 168.

  As shown in FIG. 12, the inlet side bracket body 176 is located on the rear surface side of the cylinder head 55 (above the flywheel housing 60). The inlet side bracket body 176 is bolted to the rear surface of the cylinder head 55 at the lower end side of the fixed bracket 179. A hanging metal fitting 86 is detachably bolted to the middle portion of the fixing bracket 179. A relay bracket 180 is bolted to the upper end side of the fixed bracket 179. The proximal end side of the extension bracket 181 is bolted to the middle portion of the relay bracket 180, and the distal end side of the extension bracket 181 is fastened to the upstream cover body 169 of the gas purification housing 168 via a bolt and a nut.

  As shown in FIG. 13, the outlet right bracket body 177 and the outlet left bracket 178 are located on the front surface side (cooling fan 59 side) of the cylinder head 55. The outlet right side bracket body 177 is bolted to the front surface of the cylinder head 55 at the lower end side of the fixed bracket 182, and is bolted to the upper surface of the cylinder head 55 at the middle portion of the fixed bracket 182. A relay bracket 183 is bolted to the upper end side of the fixed bracket 182. The extension bracket 184 is bolted to the relay bracket 183, and the extension bracket 184 is bolted to the right bracket fastening portion 172 formed at the flange portion between the intermediate case 166 and the downstream case 167 in the gas purification housing 168. Yes.

  The outlet left side bracket 178 extends upward from the left side of the cylinder head 55. The right side surface on the lower end side (base end side) of the left outlet bracket 178 is bolted to the front portion of the left side surface of the cylinder head 55. An upper end curved surface (U-shaped pressure receiving surface) 178 a that receives the outer peripheral surface of the gas purification housing 168 is provided on the upper end side (front end side) of the outlet left side bracket 178, and the intermediate case 166 and the downstream case 167 in the gas purification housing 168 are provided. Bolts are fastened to the left bracket fastening portion 173 formed at the flange portion of the boundary.

  As is clear from the above description, the exhaust gas purifying device 52 of the embodiment is arranged above the engine 5 via the exhaust manifold 57, the inlet side bracket body 176, the outlet right side bracket body 177 and the outlet left side bracket 178. The cylinder head 55 and the exhaust manifold 57 are detachably connected. Therefore, the exhaust gas purification device 52 can be supported with high rigidity as one of the components of the engine 5, and damage to the exhaust gas purification device 52 due to vibration or the like can be prevented. In particular, in the embodiment, since the lower end side of the inlet side bracket body 176, the outlet right side bracket body 177, and the outlet left side bracket 178 is fastened to the cylinder head 55, the reference mounting position of the exhaust gas purifying device 52 with respect to the engine 5 is highly accurate. Can be set. For this reason, even if the exhaust gas purifying device 52 is heavier than a muffler or the like as a post-processing device, it can be properly mounted at a predetermined position.

  Further, as shown in FIGS. 12 and 13, an embedded bolt 85 is provided on the upward mounting surface 57 a of the exhaust manifold 57. Bolt holes are formed in the inlet flange body 161 c of the exhaust gas inlet pipe 161. The embedded bolt 85 is passed through the inlet flange body 161c of the exhaust gas inlet pipe 161 from below, a nut is screwed to the upper end side of the embedded bolt 85, and the exhaust gas inlet pipe 161 is detachably fastened to the exhaust manifold 57.

  In the exhaust manifold 57, the upward mounting surface 57a of the upper outlet portion extending upward is a surface inclined from the horizontal surface so that the right edge is on the lower side, and the upper end of the embedded bolt 85 is inclined to the right. Is installed. Therefore, when the inlet flange body 161 c of the exhaust gas inlet pipe 161 is attached to the upward mounting surface 57 a of the exhaust manifold 57, the DPF 52 is lowered from the upper right side to the lower left side with respect to the exhaust manifold 57.

  As shown in FIG. 13, the base end portion 178b of the outlet left side bracket 178 has a plurality of through holes penetrating to the left and right in order to insert mounting bolts to be screwed into bolt holes provided on the left side surface of the intake manifold 56. Provided. A hanging fitting 87 is detachably bolted to the middle part of the outlet left side bracket 178. The outlet left side bracket 178 has an upper end curved surface 178 a corresponding to the outer shape of the gas purification housing 168 at the upper end portion.

  An embedded bolt 88 serving as a locking body (convex body) is provided in the central portion on the upper end side of the outlet left bracket 178. The embedded bolt 88 protrudes forward from the front surface of the center portion on the upper end side of the outlet left bracket 178. The left bracket fastening portion 173 of the exhaust gas purifying device 52 is formed with a notch 89 for bolt insertion having a downward opening as a locking body (concave). In other words, a bolt hole for inserting the embedded bolt 88 formed in the left bracket fastening portion 173 is notched downwardly to form a bolt insertion notch 89.

  The embedded bolt 88 of the outlet left side bracket 178 is configured to be engageable with the bolt insertion notch 89 of the left side bracket fastening portion 173 of the exhaust gas purification device 52. The downstream side (exhaust discharge side) of the gas purification housing 168 in the exhaust gas movement direction is placed on the upper end side of the outlet left bracket 178 and the bolt insertion notch 89 is engaged with the embedded bolt 88 so that the gas is supplied to the outlet left bracket 178. The downstream side (exhaust discharge side) of the purification housing 168 in the exhaust gas movement direction is supported.

  By the engagement of the embedded bolt 88 and the bolt insertion notch 89, the exhaust discharge side of the gas purification housing 168 is held at a predetermined position. That is, the relay bracket 180 attached to the gas purification housing 168 via the extension bracket 181 is placed on the upper end side of the fixed bracket 179, and the inlet flange body 161c of the exhaust gas inlet pipe 161 is placed on the upward mounting surface 57a of the exhaust manifold 57. In addition, the gas purification housing 168 can be temporarily fixed by engaging the bolt insertion notch 89 on the gas purification housing 168 side with the embedded bolt 88 on the outlet left bracket 178 side.

  For this reason, the mounting position of the exhaust gas purification device 52 with respect to the engine 5 can be easily determined, and the worker who performs the assembly work can release both hands from the exhaust gas purification device 52 in the temporarily fixed state. Therefore, it is not necessary to perform assembly work such as bolt fastening or removal work while supporting the entire weight of the exhaust gas purification device 52, and when the exhaust gas purification device 52 is loaded or unloaded, or assembling and disassembling the exhaust gas purification device 52. The labor at the time of work can be greatly reduced.

  Thereafter, with the bolt insertion notch 89 engaged with the embedded bolt 88, the locking nut 90 is screwed into the embedded bolt 88 (tightening), and the left bracket fastening portion 173 in the exhaust gas purification device 52 is exited. The left bracket 178 is connected to the upper end side central portion. In contrast to the embodiment, an embedded bolt 88 may be provided on the exhaust gas purification device 52 side, and a bolt insertion notch 89 may be provided on the outlet left bracket 178 side.

  Either the outlet left bracket 178 or the exhaust gas purifying device 52 (gas purification housing 168) is provided with a convex body (embedded bolt 88) or a concave body (bolt insertion notch 89) as a locking body, and on the left side of the outlet. Since the concave body (bolt insertion notch 89) or the convex body (embedded bolt 88) is provided on the other side of the bracket 178 or the exhaust gas purifying device 52, the embedded bolt 88 (convex body). And the engagement position of the bolt insertion notch 89 (concave), the assembly position of the exhaust gas purification device 52 can be easily determined. Therefore, it is not necessary to perform assembly work such as bolt fastening while supporting the entire weight of the DPF 52, and the operator can separate the DPF 52 from both hands and perform assembly work, thereby improving the assembly and disassembly workability of the DPF 52.

  Further, the opening direction of the bolt insertion notch 89 is notched in a direction in which the inlet flange body 161 c of the exhaust gas inlet pipe 161 in the DPF 52 is placed on the upward mounting surface 57 a of the exhaust manifold 57. That is, the bolt insertion notch 89 is opened in a direction parallel to the inclination direction of the embedded bolt 85 provided on the upward mounting surface 57 a of the exhaust manifold 57. Therefore, when the DPF 52 is fixedly supported by the exhaust manifold 57, the inlet side bracket body 176, the outlet right side bracket body 177, and the outlet left side bracket 178, the bolt holes of the inlet flange body 161c in the exhaust gas inlet pipe 161 are inserted into the embedded bolts 85. Accordingly, the bolt insertion notch 89 can be easily engaged with the embedded bolt 88, and the assembly / disassembly workability of the DPF 52 can be further improved.

  Further, when the DPF 52 is temporarily fixed and supported with the bolt insertion notch 89 engaged with the embedded bolt 88, the upward mounting surface 57a of the exhaust manifold 57, the upper surface of the fixed bracket 179, and the outlet right bracket body 177 are relayed. The exhaust gas inlet pipe 161, the relay bracket 180, the extension bracket 184, and the outer peripheral surface of the gas purification housing 168 are mounted on the upper curved surface 178 a of the bracket 183 and the outlet left bracket 178, respectively. Accordingly, since the DPF 52 in the temporarily fixed state is stably temporarily fixed and supported by the exhaust manifold 57, the fixed bracket 179, the relay bracket 183, and the outlet left side bracket 178, the operator can release both hands from the DPF 52 in this state. .

  In addition, hanging brackets 86 and 87 for hanging a hanging wire or the like are connected to the inlet side bracket body 176 and the outlet left side bracket 178. Therefore, when loading and unloading the diesel engine 5 on the work vehicle, the suspension wires 86 and 87 are respectively inserted into the suspension through holes, and the suspension wires hooked to the hooks of the chain block. The diesel engine 5 can be attached and detached by lifting.

  The hanging fitting 86 is connected to the fixed bracket 179 of the inlet side bracket body 176 located on the right rear side of the diesel engine 5, while the hanging fitting 87 is located on the left side of the outlet located on the left front side of the diesel engine 5. The bracket 178 is connected. That is, since the suspension fittings 86 and 87 are disposed diagonally with respect to the diesel engine 5, the diesel engine 5 can be suspended by a chain block or the like in a stable posture. Furthermore, by making the hanging fittings 86 and 87 detachable, the hanging fittings 86 and 87 can be removed when the diesel engine 5 is mounted on the work vehicle, and the diesel engine 5 in the engine room of the work vehicle can be removed. The storage capacity can be reduced.

  In addition, the structure of each part in this invention is not limited to embodiment of illustration, A various change is possible in the range which does not deviate from the meaning of this invention.

DESCRIPTION OF SYMBOLS 1 Tractor 5 Engine 52 Exhaust gas purification device 53 Output shaft 54 Cylinder block 55 Cylinder head 56 Intake manifold 57 Exhaust manifold 58 Head cover 88 Embedded bolt 89 Notch 90 for bolt insertion Locking nut 161 Exhaust gas inlet pipe 161a Upward opening end 161b Downward Open end 161c Inlet flange body 161d Pipe wall 162 Exhaust gas outlet pipe 165 Upstream case 165a Exhaust gas inlet 166 Intermediate case 167 Downstream case 168 Gas purification housing 169 Upstream lid 172 Right side bracket fastening part 173 Left side bracket fastening part 174 Downstream side lid body 176 Inlet side bracket body 177 Outlet right side bracket body 178 Outlet left side bracket 186 Temperature sensor 187 Temperature sensor 188 Sensor piping 189 Sensor piping 190 Connector 191 wiring connector 192 differential pressure sensor

Claims (5)

An engine device mounted on a work vehicle,
An exhaust gas purification device installed at the upper part of the engine device;
A pressure sensor for measuring the pressure of the exhaust gas in the exhaust gas purification device;
A sensor pipe for communicating the internal space of the exhaust gas purifying device and the pressure sensor;
The exhaust gas purification device includes a substantially cylindrical housing that allows exhaust gas to pass therethrough, and an exhaust gas inlet pipe provided on an outer peripheral surface of the housing,
The exhaust gas purifying device is disposed at an upper portion of the engine device in an inclined posture such that the central axis of the housing is closer to the inside of the engine device than directly above when viewed from the inlet side end of the exhaust gas inlet pipe. Installed,
The engine apparatus according to claim 1, wherein a connection position of the sensor pipe with respect to the housing is a position in a horizontal direction or more when viewed from a central axis of the housing.   The engine device according to claim 1, wherein a connection position of the sensor pipe with respect to the housing is a horizontal position when viewed from a central axis of the housing.   The engine apparatus according to claim 1, wherein a connection position of the sensor pipe with respect to the housing is a position closer to an inner side of the engine apparatus. A bracket for fixing and supporting the exhaust gas purification device on an upper portion of the engine device;
A convex portion is formed on one of the exhaust gas purification device and the bracket,
A concave portion corresponding to the convex portion is formed on the other of the exhaust gas purification device and the bracket,
The engine device according to any one of claims 1 to 3, wherein the exhaust gas purification device can be temporarily fixed to the bracket by fitting the convex portion into the concave portion. The exhaust gas inlet pipe has a pipe wall that is diverging from the inlet side end of the exhaust gas inlet pipe toward the housing,
The engine device according to any one of claims 1 to 4, wherein a surface of the tube wall that is closer to the outside of the engine device is substantially parallel to a vertical direction.

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