JP6475569B2 - Engine equipment - Google Patents

Description

  The present invention relates to an engine device such as a diesel engine, and more particularly to an engine device equipped with an exhaust gas purification device that removes particulate matter (soot, particulates) and the like contained in exhaust gas. is there.

  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 (see, for example, Patent Document 1).

JP 2008-31955 A

  Patent Document 1 discloses a structure of a tractor in which an engine is mounted on the front part of a traveling machine body, a front and rear longitudinal DPF is disposed on the left and right sides of an exhaust manifold above the engine, and the engine is covered with a bonnet together with the DPF. Yes. In the tractor described in Patent Document 1, the bonnet is formed in a U-shaped cross section downward. For this reason, the left and right corners of the bonnet project outward. The DPF is positioned inside the left and right corners, that is, on the left and right corners of the bonnet. Thus, in the configuration of Patent Document 1, since the left and right corners of the bonnet are projected outward from the viewpoint of the installation space of the DPF, the front view of the operator seated on the control seat of the traveling aircraft, particularly the hood The field of vision from the left and right corners was sacrificed.

  Further, when the DPF is assembled away from the engine, the temperature of the exhaust gas supplied from the engine to the DPF decreases, and regeneration of the DPF soot filter and the like tends to be incomplete. There is a problem that a special method for regenerating the soot filter or the like by raising the temperature of the gas is required.

  On the other hand, when the DPF is assembled close to the engine, the temperature drop of the exhaust gas supplied from the engine to the DPF is reduced, and the temperature of the exhaust gas in the DPF can be easily maintained at a high temperature. Since it cannot be easily simplified, there is a problem that the assembly workability or vibration resistance of the DPF cannot be improved. In addition, as the engine becomes larger, the engine mounting space in the work vehicle is not sufficient, and not only the design change on the work vehicle side is forced, but there is also a problem that the convenience for the operator becomes worse.

  Accordingly, the present invention seeks to provide an engine device that has been improved by examining these current conditions.

Engine apparatus of the present invention, an exhaust gas purification device for purifying exhaust gas from an engine, the engine the exhaust gas purifying device is mounted such in the cylinder head upward along the output shaft core of the engine device met Te, an intake manifold and an exhaust manifold which is disposed distributedly on both sides of the cylinder head, an exhaust gas recirculation device for mixing the part and the fresh air of the exhaust gas into the intake manifold, the exhaust from the exhaust manifold A recirculation exhaust gas pipe for introducing gas into the exhaust gas recirculation device, and a direction that intersects the output shaft of the engine as a housing support for supporting and fixing the gas purification housing constituting the exhaust gas purification device The outlet side bracket body and the outlet side bracket body formed in a wide width on the outlet side bracket. The cylinder body is positioned on the front surface side of the cylinder head on the cooling fan mounting side, the inlet bracket body is positioned on the rear surface side of the cylinder head on the flywheel mounting side, and the lower end side of the cylinder head is A fixing bracket that is bolted to the rear surface, a relay bracket that is bolted to the upper end side of the fixing bracket, and an extension bracket that is connected to the relay bracket and that fixes the inlet side lid of the gas purification housing. The reinforcing plate is attached to a mounting seat protruding from the surface of the fixing bracket opposite to the cylinder head, and both side edges of the reinforcing plate are opened between the reinforcing plate and the fixing bracket. A space is provided, and the recirculated exhaust gas pipe is passed through the space between the inlet bracket body and the reinforcing plate. Those configured to.

  In the above engine device, the outlet bracket body has a fourth bracket in which a base end portion is connected to an upper surface of an intake manifold provided on the other side surface of the cylinder head and a tip portion is bent above the cylinder head, and the cylinder head And a fifth bracket having a base end connected to one side surface and a front end bent and connected to a front end of the fourth bracket, and the connection flange of the exhaust gas purifying device is connected to the outlet side bracket body. By being connected, the exhaust gas purification device can be configured to be supported by the outlet side bracket body connected to both side surfaces of the cylinder head, and the support rigidity of the exhaust gas purification device can be further improved. And because the outlet side bracket body is configured to straddle over the cylinder head, the outlet side bracket body can receive the exhaust gas outlet side of the exhaust gas purification apparatus at the time of detachment of the exhaust gas purification apparatus, Assembly / disassembly workability can be improved.

  The engine device further includes an exhaust communication pipe having a hollow portion for supplying exhaust gas from the exhaust manifold to the exhaust gas purification device, and the exhaust gas is provided at an exhaust gas outlet provided above the exhaust communication pipe. The exhaust gas inlet side of the exhaust gas purification apparatus is connected to the exhaust gas inlet side of the exhaust gas purification apparatus via the exhaust communication pipe together with the inlet side bracket by connecting the exhaust gas inlet of the purification device and fixing the exhaust communication pipe with the exhaust manifold. By being supported by the engine, the exhaust gas inlet side of the exhaust gas purification device can be supported from both sides by the inlet bracket and the exhaust communication pipe, and the support rigidity of the exhaust gas purification device can be increased. It can be further improved.

  In the above engine apparatus, the engine apparatus includes an intake manifold and an exhaust manifold arranged on both side surfaces of the cylinder head, and an intake communication pipe having a hollow portion for supplying fresh air to the intake manifold is disposed upward. The structure is inclined toward the cylinder head toward the cylinder head, and extends upward from the intake manifold so that the intake communication pipe extending upward is inclined toward the cylinder head. The configuration of can be summarized in a compact. Therefore, the engine device can be configured to match the shape of the bonnet of the work vehicle whose upper surface is curved.

  Further, in the above engine device, the engine device is installed in a traveling machine body and covered with a bonnet, and the lubricating oil is stored in an oil pan disposed on a lower surface of a cylinder block connected to the traveling machine body, wherein the oil pan An oil filter for filtering the lubricating oil from the cylinder is disposed on the side surface of the cylinder block via a support bracket having a hollow portion for allowing the lubricating oil to pass therethrough, and the lower end of one end surface of the support bracket is connected to the cylinder block. On the other hand, by connecting the oil filter above the other end surface of the support bracket, the oil filter is arranged above the traveling machine body, so that lubricating oil is supplied to the oil filter through the support bracket. The oil filter can be arranged without interfering with the traveling machine body. Further, by disposing the oil filter above the traveling machine body, the oil filter can be easily replaced when the bonnet is opened.

  The support bracket is provided with a connection port connected to an external pipe for circulating the lubricating oil to an external device, and the lubricating oil from the external pipe is divided into the lubricating oil from the oil filter in the support bracket. Thus, by making the support bracket function as a branch flow path from the oil filter, a plurality of functions can be shared by a single component, so that the number of components of the engine device can be reduced. In order to increase engine output, the external device is a supercharger, and an annular flow path for circulating the lubricating oil supplied from the support bracket to the supercharger is provided as the external pipe. When a supercharger is provided, lubricating oil can be efficiently circulated through the supercharger. Moreover, each part including a supercharger can be compactly mounted in the apparatus.

  The engine device includes a flywheel disposed on an end surface intersecting an engine output shaft core line in a cylinder block, and a flywheel housing that covers the flywheel, and is mounted on a traveling machine body and covered with a bonnet. An engine device for mounting on a vehicle, wherein the flywheel housing is configured to have a width narrower than a height, and both end surfaces of the cylinder block are fixed to the traveling machine body via a front engine mount. By setting it as the thing, by making the width | variety of the flywheel housing into the shape narrowed, an engine apparatus can be mounted, without making a flywheel housing interfere with respect to a narrow vehicle body. Since the flywheel housing can be prevented from colliding with a traveling machine body having a different vibration system, the engine device can be prevented from being broken or damaged.

  In addition, the flywheel housing has an outer shape in which a left and right sides of a circle are notched and a pedestal is projected at the top, and the upper pedestal is connected to the traveling machine body via a rear engine mount. Thus, not only the flywheel housing can be mounted on a narrow traveling machine body but also a pedestal that can be connected to the traveling machine body. Therefore, the rigidity by the support structure of the engine device can be compensated by connecting the traveling machine body with the flywheel housing having high rigidity.

  A cylinder head disposed above the cylinder block; a cooling fan disposed on an end surface of the cylinder head opposite to the flywheel; and an exhaust gas disposed above the cylinder head along an engine output axis. A cooling water pump is provided between the cooling fan and the cylinder head, and a cooling water inlet of a thermostat cover above the cooling water pump is provided below the exhaust gas purification device. By setting it to the side, the cooling fan can be placed on the upper side of the traveling aircraft, and by arranging the cooling fan and the cooling water pump coaxially, the engine parts can be placed together in a compact manner. The engine device can be downsized. Therefore, it can be mounted on a traveling vehicle having a limited engine room shape.

  According to the present invention, it is possible to easily prevent the exhaust gas purification device from vibrating in a direction crossing the engine output shaft core. The exhaust gas purifying device connected by the inlet side bracket body and the outlet side bracket body can be supported in a vibration-proof manner easily. By providing the reinforcing plate, the support rigidity of the exhaust gas purifying device by the inlet side bracket body can be further improved.

According to the present invention, the inlet bracket body is divided into a fixed bracket, a relay bracket, and an extension bracket, so that the assembly position can be adjusted by the relay bracket , and the assembly / disassembly workability can be improved.

  According to the present invention, the recirculation exhaust gas pipe is passed between the inlet side bracket body and the reinforcing plate, so that the support rigidity of the exhaust gas purification device can be improved while reducing the size of the engine device. Even work machines with limited mounting space can be mounted. Further, since the recirculated exhaust gas pipe is sandwiched between the inlet side bracket body and the reinforcing plate, the recirculated exhaust gas pipe can be protected from external force.

It is a left view of the diesel engine of this invention. It is a right view of the diesel engine. It is a top view of the diesel engine. It is a front view of the diesel engine. It is a rear view of the diesel engine. It is a bottom view of the diesel engine. It is a back perspective view of the diesel engine. It is a front perspective view of the diesel engine. It is a fragmentary perspective view of the diesel engine. It is a fragmentary perspective view of the diesel engine. It is explanatory drawing of the support structure of DPF. It is explanatory drawing of the support structure of DPF. 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. It is a front view which shows the relationship between DPF and a support bracket. It is a rear view which shows the relationship between DPF and a support bracket. It is attachment explanatory drawing of DPF. It is an enlarged view of the attachment explanatory drawing of DPF. It is a left view of the work vehicle carrying a diesel engine. It is a top view of the traveling body in the work vehicle. It is sectional drawing seen from the engine front which shows the structure in the engine room in the work vehicle. It is sectional drawing seen from the engine back surface which shows the structure in the engine room in the work vehicle. It is a partially expanded view which shows the relationship between the traveling body of the work vehicle, and a flywheel housing.

  DESCRIPTION OF EMBODIMENTS Embodiments embodying the present invention will be described below with reference to the drawings. First, a schematic structure of a common rail type diesel engine 5 in the embodiment 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. 1 to 8, a diesel engine 5 as a prime mover mounted on a work vehicle such as a tractor includes a continuously regenerative 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 72a.

  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. The oil filter 63 is attached to the right side surface of the cylinder block 54 via an oil filter support member 88.

  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 FIGS. 19 and 20) 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. An oil cooler 68 is disposed on the right side surface of the cylinder block 54 at a position sandwiched between the common rail 66 and the oil filter 63.

  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 69 is provided in the flywheel housing 60. The pinion gear of the starter 69 for starting the engine 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 69.

  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 235 (see FIG. 20) mounted on the work vehicle 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, by driving the cooling water pump 71, cooling water is supplied to a water cooling jacket (not shown) formed in the cylinder head 55 and the cylinder block 56 to cool the diesel engine 5. Cooling water that has contributed to cooling the diesel engine 5 is returned to the radiator 235. 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 and the cooling water pump 71 via the cooling fan V-belt 72a. Further, rotational power is transmitted to the alternator 73 from the front end side of the output shaft 53 via the alternator V-belt 72b. Cooling water in a radiator 235 (see FIGS. 22 and 26) mounted on the work vehicle is supplied to the cylinder block 54 and the cylinder head 55 by driving of the cooling water pump 71 to cool the diesel engine 5.

  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) 238 (see FIG. 19) having vibration-proof rubber. In the embodiment, the engine leg mounting portions 74 on the cylinder block 54 side are connected to the engine frames 14 via the engine legs 238 so that the cylinder block 54 is sandwiched between the pair of left and right engine frames 14 (see FIG. 19) in the work vehicle. Fasten the bolts. 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 right side inlet 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. ing. 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 (exhaust gas recirculation device) 75 is mainly located on the right side of the diesel engine 5, specifically, on the right side of the cylinder head 55, and a part of the exhaust gas (EGR gas) of the diesel engine 5 and new The air is mixed and supplied to the intake manifold 56. The EGR device (exhaust gas recirculation 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, and an intake throttle member 77 provided in the intake communication pipe 76. The recirculation exhaust gas pipe 78 connected to the exhaust manifold 57 via the EGR cooler 80 and the 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. 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 intake side of 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 intake side of the intake manifold 56. To do. 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.

  A turbocharger 81 is disposed on the left side of the cylinder head 5 and above the exhaust manifold 57. The turbocharger 81 includes a turbine case 82 with a built-in turbine wheel and a compressor case 83 with a blower wheel. The exhaust intake side of the turbine case 81 is connected to the outlet of the exhaust manifold 57. The exhaust discharge side of the turbine case 81 is connected to the exhaust intake side of the exhaust gas purification device 52 via the exhaust communication pipe 84. That is, the exhaust gas discharged from each cylinder of the diesel engine 5 to the exhaust manifold 7 is discharged to the outside via the turbocharger 81, the exhaust gas purification device 52, and the like.

  The intake side of the compressor case 83 is connected to the intake / exhaust side of the air cleaner 221 (see FIG. 20) via the air supply pipe 222 (see FIG. 20). The intake / discharge side of the compressor case 83 is connected to the intake intake side of the intercooler 224 (see FIG. 20) via the upstream relay pipe 223 (see FIG. 20). Further, the intake air discharge side of the intercooler 224 (see FIG. 20) is connected to the intake throttle member 77 via the downstream relay pipe 225 (see FIG. 20). That is, fresh air (external air) removed by the air cleaner 221 is sent from the compressor case 62 to the EGR device 75 via the intercooler 224 and then supplied to each cylinder of the diesel engine 5.

  An exhaust gas purifying device 52 is disposed on the upper surface side of the diesel engine 5 above the exhaust manifold 57 and the turbocharger 81, that is, above the exhaust manifold 57 and the turbocharger 81 on the left side of the cylinder head 55. ing. 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.

  Next, the structure of the exhaust gas purification device (DPF) 52 will be described with reference to the previous drawings and FIGS. The 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 163 such as platinum and a soot filter 164 having a honeycomb structure are arranged in series and accommodated therein. In the above configuration, nitrogen dioxide (NO 2) generated by the oxidation action of the diesel oxidation catalyst 163 is taken into the soot filter 164. Particulate matter contained in the exhaust gas of the diesel engine 5 is collected by the soot filter 164 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 1 is reduced. The diesel oxidation catalyst 163 and the soot filter 164 correspond to a gas purification filter accommodated in the purification housing 168.

  The DPF 52 includes an upstream case (first case) 165 having an exhaust gas inlet pipe 161 on the outer peripheral surface, an intermediate case (second case) 166 connected to the exhaust inlet side case 165, and an exhaust outlet pipe 162 having an outer peripheral surface. And a downstream case (third case) 167 to be inserted. 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 163 and a soot filter 164 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. Further, a tail pipe 229 (see FIG. 20) is connected to an exhaust gas outlet pipe 162 provided on the outer peripheral surface of the downstream case 167 via an exhaust pipe 227 (see FIG. 22), from the exhaust gas outlet pipe 162. Exhaust gas is discharged to the outside through the exhaust pipe 227 and the tail pipe 229.

  The connecting portion of the upstream case 165 and the intermediate case 166 is connected by being sandwiched from both sides in the exhaust gas movement direction by a pair of thick plate-like holding flanges 170 and 171. That is, the joining flange provided at the downstream opening edge of the upstream case 165 and the joining flange provided at the upstream opening edge of the intermediate case 166 are sandwiched by the sandwiching flanges 170 and 171, so that the upstream case 165 The gas purification housing 168 is configured by connecting the downstream side and the upstream side of the intermediate case 166. At this time, the upstream side case 165 and the intermediate case 166 are detachably connected by fastening the center clamping flanges 170 and 171 with bolts.

  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 has an exhaust communication pipe 84 as an exhaust relay path. And communicates with the exhaust discharge side of the turbine case 82. The exhaust communication pipe 84 has a substantially L-shape when viewed from the side. The exhaust communication pipe 84 is provided with the exhaust intake side in front and is connected to the exhaust discharge side of the turbine case 82, while the exhaust discharge side is provided upward and the DPF 52. The exhaust gas inlet pipe 161 is connected. Further, the exhaust communication pipe 84 includes a connection support portion 84 a extending from the outer peripheral surface side to the lower side, and the lower end of the connection support portion 84 a is connected to the left side surface of the exhaust manifold 57. That is, the exhaust communication pipe 84 is fixed to the diesel engine 5 by being bolted to the exhaust manifold 57 and the turbine supercharger 81.

  Next, a structure for assembling the exhaust gas purification device 52 to the diesel engine 5 will be described with reference to FIGS. 9 to 18. The diesel engine 5 includes an inlet side bracket body 176 and an outlet side bracket body 177 as a housing support body that supports and fixes the exhaust gas purification device 52 (gas purification housing 168). The inlet side bracket body 176 and the outlet side bracket body 177 are formed wide in a direction intersecting with the output shaft 53 of the diesel engine 5. The inlet side bracket body 176 and the outlet side bracket body 177 are detachably connected to the cylinder head 55 of the diesel engine 5 directly or via the intake manifold 56 or the exhaust manifold 57. The inlet side bracket body 176 and the outlet side bracket body 177 are arranged upright on the front side and the rear side that 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 side bracket body 177 is located on the front side of the cylinder head 55 and supports the exhaust discharge side of the gas purification housing 168.

  The lower end (base end) side of the inlet side bracket body 176 is bolted to the rear surface of the cylinder head 55 (the surface intersecting the output axis), and the upper end side of the inlet side bracket body 176 is the inlet side lid of the exhaust gas purification device 52. The body 169 is fastened. A reinforcing plate (support plate) 195 in a posture parallel to the inlet side bracket body 176 is connected to a surface of the inlet side bracket body 176 opposite to the connection surface with the cylinder head 55. That is, a part of the rear surface on the lower end (base end) side of the inlet side bracket body 176 is projected, and the four corners of the support plate 195 are bolted to the projected portion. By arranging the inlet-side bracket body 176 and the support plate 195 in the front-rear direction and connecting them, the support strength of the exhaust gas purifying device 52, which is a heavy object, is not impaired, and the gap between the inlet-side bracket body 176 and the support plate 195 is reduced. A space for installing the recirculation exhaust gas pipe 78 for connecting the EGR device 75 and the EGR cooler 780 can be provided.

  The inlet side bracket body 176 is located on the rear side of the cylinder head 55 (above the flywheel housing 60). The inlet side bracket body 176 has a lower end side of the fixed bracket (first bracket) 178 fastened to the rear surface of the cylinder head 5 with a bolt. A relay bracket 179 is bolted to the upper end side of the fixed bracket 178. The proximal end side of the extension bracket (third bracket) 180 is bolted to the middle portion of the relay bracket (second bracket) 179, and the distal end side of the extension bracket 180 is the inlet of the gas purification housing 168 via the bolt and nut. Fastened to the side lid (upstream lid) 169.

  The fixed bracket 178 has a front surface as a connection surface with the rear surface of the cylinder head 55, and a plurality of mounting seats 178d provided with bolt holes for fastening the reinforcing plate 195. By bolting the four corners of the reinforcing plate 195 to the mounting seat 178d of the fixing bracket 178, a space is provided between the reinforcing plate 195 and the fixing bracket 178 so that both side edges (left and right) of the reinforcing plate 195 are opened. The recirculated exhaust gas 78 can be installed between the plate 195 and the fixed bracket 178. The configuration in which the recirculated exhaust gas pipe 78 is passed between the inlet side bracket body 176 and the reinforcing plate 195 can improve the support rigidity of the exhaust gas purification device 52 while reducing the size of the engine 5. Further, according to the above configuration, not only the working machine in which the space for mounting the engine 5 is limited can be mounted, but also the recirculated exhaust gas pipe 78 can be protected from external force.

  The outlet side bracket body 177 is located on the front surface side (cooling fan 59 side) of the cylinder head 55. The outlet side bracket body 177 of the embodiment is configured to be divided into an outlet side first bracket (fourth bracket) 181 and an outlet side second bracket (fifth bracket) 182. The outlet-side first bracket 181 is formed of a substantially L-shaped member that extends upward from the right side of the cylinder head 55 and is bent leftward above the cylinder head 55. On the other hand, the outlet-side second bracket 182 is configured by a substantially L-shaped member that extends upward from the left side of the cylinder head 55 and is bent rightward above the cylinder head 55. Therefore, the outlet side bracket body 177 has a substantially portal shape on the front surface side of the cylinder head 55 and is fixed so as to straddle the cylinder head 55 at the rear position of the thermostat case 70.

  The lower end surface (base end side) of the outlet side first bracket 181 is bolted to the upper surface side of the intake manifold 56, and the upper left side surface (tip end side) of the outlet side first bracket 181 is connected to the outlet side second bracket 182. Bolts are fastened to the upper right side (front end side). The lower right side surface (base end side) of the outlet-side second bracket 182 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) 182 a that receives the outer peripheral surface of the gas purification housing 168 is provided on the upper end side (tip side) of the outlet-side second bracket 182, and a sandwiching flange (outlet clamping flange) in the gas purification housing 168 is provided. ) A bolt is fastened to a bracket fastening portion 172a formed on the lower side of 172.

  As is clear from the above description, the exhaust gas purifying device 52 of the embodiment is disposed above the diesel engine 4 via the exhaust communication pipe 84, the inlet side bracket body 176, and the outlet side bracket body 177, which are housing supports. The cylinder head 55, the intake manifold 56 and the exhaust manifold 57 of the engine 1 are detachably connected. Further, the inlet side bracket body 176 and the exhaust communication pipe 84 on the upstream side (exhaust intake side) in the exhaust gas movement direction are distributed to the cylinder head 55 and the exhaust manifold 57, and downstream in the exhaust gas movement direction (exhaust exhaust side). By distributing the outlet side bracket body 177 (the outlet side first bracket 181 and the outlet side second bracket 182) to the cylinder head 55 and the intake manifold 56, the exhaust gas purification device 52 is supported at four points.

  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 sides of the inlet side bracket body 176 and the outlet side second bracket 182 are fastened to the cylinder head 55, the reference mounting position of the exhaust gas purifying device 52 with respect to the engine 5 can be set with high accuracy. 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.

  As shown in FIGS. 11, 13, and 15, the fixed bracket 178 is configured as a plate-like body having a wide crossing direction with the exhaust gas movement direction of the DPF 1 (the output shaft 53 of the diesel engine 5). The lower part of the recirculation exhaust gas pipe 78 is bolted to the cylinder head 55. That is, the recirculation exhaust gas pipe 78 connected to the EGR cooler 80 bypasses the rear of the fixed bracket 178 and is connected to the intake throttle member 77. Further, the fixed bracket 178 includes a front part connecting part (first part connecting part) 178a having a bolt hole in an upper part of the recirculation exhaust gas pipe 78, and is suspended from the hanging metal fitting connecting part 178a. The metal fitting 86 is detachably bolted.

  Further, the fixed bracket 178 includes a bracket connecting portion 178b having a bolt hole on the upper surface of the upper end portion, and the relay bracket 179 is detachably bolted to the bracket connecting portion 178b. Further, the fixing bracket 178 includes a side part connecting part (second part connecting part) 178c having a bolt hole on the right side surface of the upper end portion, and the side part connecting part 178c includes, for example, an exhaust pipe. A component fixing bracket (exhaust pipe fixing bracket) 210 (see FIG. 22) for fixing external components such as 227 (see FIGS. 31 and 32) is bolted.

  In addition, the fixed bracket 178 has a configuration in which the front-rear width of the upper end side (connection side to the relay bracket 179) is thicker than the front-rear width of the lower end side (connection side to the cylinder head 55). A space through which the recirculation exhaust gas pipe 78 can be passed is provided below. The mounting bracket 178 is provided with four mounting seats 178d provided with bolt holes at the left and right positions of the boundary position (upper and lower halfway position) and the lower edge portion of the lower width portion of the fixed bracket 178. It protrudes backward. Therefore, after the recirculation exhaust gas pipe 78 is disposed at the lower end portion of the fixed bracket 178, the reinforcing plate 195 is bolted to the mounting seat 178d, so that the rear of the cylinder head 55 is detoured to the left and right. The fixing bracket 178 and the reinforcing plate 195 can be installed so as to sandwich the front and rear of 78.

  As shown in FIGS. 11, 13, and 15, the relay bracket 179 is bolted to the fixing bracket 178 with the bottom surface of the lower end portion abutting against the bracket connecting portion 178 b of the upper surface of the upper end portion of the fixing bracket 178. . In the relay bracket 179, a base plate 179a extending upward from a lower end portion fixed to the bracket connecting portion 178b of the fixed bracket 178 is welded with a connecting plate 179b standing rearward with respect to the plate 179a. It has a configuration. The connecting plate 179b of the relay bracket 179 has a front / rear position adjusting bolt hole that is long in the front / rear direction. Then, a mounting bolt having the position adjusting bolt hole penetrating from the right side in a loose-fitting manner is screwed to the right side surface of the extension bracket 180 to connect and fix the relay bracket 179 to the extension bracket 180. The extension bracket 180 has a configuration in which a connection portion with the relay bracket 179 is erected rearward from a fixing portion with the upstream cover body 169 of the gas purification housing 168.

  Attaching the extension bracket 180 fixed to the gas purification housing 168 in the front-rear direction to the relay bracket 179 fixed to the fixing bracket 178 only by the dimension in which the mounting bolt moves back and forth within the bolt hole for adjusting the front-rear position of the relay bracket 179 You can adjust the position. Therefore, the mounting position of the DPF 52 in the front-rear direction (exhaust gas movement direction) is fixed with respect to the fixed bracket 178 fixed to the cylinder head 55 by adjusting the position of the mounting bolt with the front-rear position adjusting bolt hole of the relay bracket 179. Can be adjusted.

  Further, the inlet side of the gas purification housing 168 is bolted to the exhaust manifold 57 at the lower end side of the connection support portion 84a of the exhaust communication pipe 84 communicating with the exhaust gas inlet pipe 161 as described above. That is, the exhaust communication pipe 84 is configured as a housing support body that supports the inlet side of the gas purification housing 168 together with the inlet side bracket body 176. Accordingly, the exhaust gas inlet side of the DPF 52 has an inlet side bracket body 176 connected to the rear surface of the cylinder head 55 and the inlet side cover body 169, and an exhaust communication pipe 84 connected to the left side surface of the exhaust manifold 57 and the exhaust gas inlet pipe 161, respectively. And is supported with high rigidity.

  Further, as shown in FIGS. 9, 11, 13, and 15, an embedded bolt 85 is provided on the upward mounting surface 84 b of the exhaust communication pipe 84. The inlet flange body 161a of the exhaust gas inlet pipe 161 is formed with a front / rear position adjusting bolt hole that is long in the front / rear direction. The embedded bolt 85 is passed through the inlet flange body 161a of the exhaust gas inlet pipe 161 from below so as to be loosely fitted, and a nut 85a is screwed to the upper end side of the embedded bolt 85, and the exhaust gas inlet pipe 161 is attached to and detached from the housing support 85. Conclude it as possible. The attachment position of the DPF 52 in the front-rear direction relative to the exhaust communication pipe 84 can be adjusted by the dimension that the embedded bolt 85 moves back and forth in the bolt hole that is long in the front-rear direction in the inlet flange body 161a.

  That is, by moving the embedded bolt 85 and the mounting bolt back and forth with respect to the front and rear position adjustment bolt holes of the relay bracket 179 and the inlet flange body 161a, the exhaust communication pipe 84 and the inlet side bracket body 176 are moved back and forth. The mounting position in the front-rear direction of the rear portion of the gas purification housing 168 can be adjusted. Accordingly, the assembly position of the DPF 52 with respect to the diesel engine 5 can be easily determined, and the assembly accuracy of the DPF 52 to be fixed to the diesel engine 5 can be improved. Further, it is possible to prevent the deformation force from acting on the gas purification housing 168 due to the connection position error of the exhaust communication pipe 84, the inlet side bracket body 176, and the outlet side bracket body 177. That is, even if the DPF 52 is provided at a position where the diesel engine 5 is easily shaken, the mechanical vibration of the DPF 52 can be easily reduced.

  The exhaust communication pipe 84 has an exhaust gas discharge side (exhaust outlet side) extended upward with respect to the connection support portion 84 a fastened to the exhaust manifold 57, and a right side (cylinder head 55) with respect to the vertical direction (vertical direction). Side). That is, when the exhaust communication pipe 84 is viewed from the back, the exhaust communication pipe 84 has the upward mounting surface 84b located on the right side to the right side of the connection portion with the exhaust manifold 57 by the connection support portion 84a. The exhaust communication pipe 84 is formed so that the upward mounting surface 84b is inclined from the horizontal plane so that the right edge is on the lower side, and the upper end of the embedded bolt 85 is inclined to the right side. Therefore, when the inlet flange body 161a of the exhaust gas inlet pipe 161 is attached to the upward mounting surface 84b of the exhaust communication pipe 84, the DPF 52 is lowered from the upper right side to the lower left side with respect to the exhaust communication pipe 84.

  At this time, the bolts of the inlet flange body of the exhaust gas inlet pipe 161 can be fitted to the embedded bolts 85 of the inclined exhaust communication pipe 84 by loosely fitting the mounting bolts to be screwed to the fixing bracket 178 to the relay bracket 179. . Further, as shown in FIG. 15, the width Dx of the bracket connecting portion 178 b on the upper surface of the fixed bracket 178 is made wider than the width Dy of the lower end of the relay bracket 179. That is, when the DPF 52 is lowered obliquely and placed on the diesel engine 5 so as to connect the exhaust gas inlet pipe 161 to the exhaust communication pipe 84, the relay bracket 179 is surely secured by the bracket connecting portion 178b on the upper surface of the fixed bracket 178. Can receive the entire bottom edge.

  As shown in FIGS. 12, 14, and 16, the base end portion 181 a of the outlet-side first bracket 181 is vertically moved so that a mounting bolt to be screwed into a bolt hole provided on the upper surface of the intake manifold 56 is inserted. A plurality of through holes are provided. For example, a base end side component connecting portion (third component connecting portion) 181b for fixing a component fixing bracket for fixing an external component such as an air conditioning compressor is provided on the base end portion 181a of the outlet side first bracket 181. I have. On the upper surface of the bent portion (intermediate portion) 181c of the outlet-side first bracket 181, for example, an intermediate component connecting portion (fourth component connecting portion) for fixing a component fixing bracket for fixing an external component such as an air conditioning hot water pipe. ) 181d.

  As shown in FIGS. 12, 14, and 16, the base end 182 b of the outlet-side second bracket 182 has left and right mounting bolts that are screwed into bolt holes provided on the left side surface of the intake manifold 56. A plurality of through-holes penetrating through are provided. The bent part (midway part) 182c of the outlet-side second bracket 182 is provided with a rear part connecting part (fifth part connecting part) 182d having a bolt hole on the rear surface side, and is suspended from the rear part connecting part 182d. The lowering metal fitting 87 is detachably bolted. The outlet-side second bracket 182 has an upper end curved surface (U-shaped pressure receiving surface) 182a corresponding to the outer shape of the gas purification housing 168 at the upper end portion from the bent portion 182c toward the right end.

  As shown in FIGS. 16 to 18, an embedded bolt 183 as a locking shaft body (convex body) is provided at the central portion on the upper end side of the outlet-side second bracket 182. The embedded bolt 183 protrudes forward from the front surface of the central portion on the upper end side of the outlet-side second bracket 182. The bracket fastening portion 172a of the outlet pinching flange 172 in the gas purification housing 168 is formed with a bolt opening notch 184 having a downward opening as a locking shaft (concave). In other words, a bolt hole for inserting the embedded bolt 183 formed in the bracket fastening portion 172a of the outlet clamping flange 172 is cut open upward to form a bolt insertion notch 184.

  An embedded bolt 183 of the outlet-side second bracket 182 is configured to be able to be locked in a bolt insertion notch 184 of the bracket fastening portion 172a of the outlet clamping flange 172. By placing the downstream side (exhaust discharge side) of the gas purification housing 168 in the exhaust gas movement direction on the upper end side of the outlet-side second bracket 182 and engaging the notch 184 for bolt insertion with the embedded bolt 183, The bracket 182 supports the downstream side (exhaust discharge side) of the gas purification housing 168 in the exhaust gas movement direction.

  The exhaust discharge side of the gas purification housing 168 is held at a predetermined position by the engagement between the embedded bolt 183 and the bolt insertion notch 184. That is, the relay bracket 179 attached to the gas purification housing 168 via the extension bracket 180 is placed on the upper end side of the fixed bracket 178, and the exhaust intake side of the exhaust gas inlet pipe 161 is connected to the upper end side of the exhaust communication pipe 84 (exhaust exhaust gas). On the inlet side bracket body 176 and the outlet side bracket body 177 by engaging the notch 184 for inserting the bolt on the gas purification housing 168 side with the embedded bolt 183 on the outlet side second bracket 182 side. The gas purification housing 168 is temporarily fixed.

  For this reason, the mounting position of the exhaust gas purification device 52 with respect to the diesel engine 5 can be easily positioned, 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 treatment device 52, and when the exhaust gas purification device 52 is loaded or unloaded, or the assembly and disassembly of the exhaust gas purification device 52 is performed. The labor at the time of work can be greatly reduced.

  After that, with the bolt insertion notch 184 engaged with the embedded bolt 183, a locking nut 185 is screwed into the embedded bolt 183 (tightening), and the bracket fastening portion of the outlet clamping flange 172 in the gas purification housing 168 172a is connected to the upper end side central portion of the outlet-side second bracket 182. Contrary to the embodiment, the embedded bolt 183 may be provided on the gas purification housing 168 side, and the bolt insertion notch 184 may be provided on the outlet side second bracket 182 side.

  Either the outlet side bracket body 177 or the gas purification housing 168 is provided with a convex body (embedded bolt 183) or a concave body (bolt insertion notch 184) as a locking body, and the outlet side bracket body 177 or the gas purification body. Since the concave body (bolt insertion notch 184) or the convex body (embedded bolt 183) is provided on the other side of the housing 168, the embedded bolt 183 (convex body) and the bolt insertion notch 184 are provided. The assembly position of the gas purification housing 168 can be easily determined by the engagement of the (concave body). 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, as shown in FIGS. 17 and 18, the opening direction of the bolt insertion notch 184 is such that the inlet flange body 161 a of the exhaust gas inlet pipe 161 in the DPF 52 is placed on the upward mounting surface 84 b of the exhaust communication pipe 84. Notched. That is, the bolt insertion notch 184 is opened in a direction parallel to the inclination direction of the embedded bolt 85 provided on the upward mounting surface 84 b of the exhaust communication pipe 84. Therefore, when the DPF 52 is fixedly supported by the exhaust communication pipe 84, the inlet side bracket body 176, and the outlet side bracket body 177, the bolts for adjusting the position of the inlet flange body 161a in the exhaust gas inlet pipe 161 are inserted into the embedded bolts 85. However, the bolt insertion notch 184 can be easily engaged with the embedded bolt 183, and the assembly / disassembly workability of the DPF 52 can be further improved.

  When the DPF 52 is temporarily fixed and supported with the bolt insertion notch 184 engaged with the embedded bolt 183, the upward mounting surface 84 b of the exhaust communication pipe 84, the bracket connecting portion 178 b of the fixed bracket 178, and the outlet side first The exhaust gas inlet pipe 61, the relay bracket 179, and the outer peripheral surface of the gas purification housing 168 are mounted on the U-shaped pressure receiving surface 182a of the two brackets 182, respectively. Therefore, since the DPF 52 in the temporarily fixed state is stably temporarily fixed and supported by the exhaust communication pipe 84, the fixed bracket 178, and the outlet-side second bracket 182, the operator can release both hands from the DPF 1 in this state.

  Further, on the exhaust gas inlet side of the DPF 52, the upward mounting surface 84b of the exhaust communication pipe 84 and the connecting plate 179b of the relay bracket 179 form a V-shaped pressure receiving surface. The exhaust gas outlet side of the DPF 52 is mounted on the U-shaped pressure receiving surface 182 a of the outlet-side second bracket 182. Therefore, when the DPF 52 is temporarily fixed and supported on the exhaust communication pipe 84, the inlet side bracket body 176, and the outlet side bracket body 177, the exhaust gas inlet side and the exhaust gas outlet side of the DPF 52 respectively have a V-shaped pressure receiving surface and a U-type heavy pressure. The surface restricts movement in the direction intersecting with the output shaft 53 of the engine 5 and prevents the DPF 52 from falling.

  Further, as shown in FIGS. 7 to 11, hanging fittings 86 and 87 for hanging a hanging wire or the like are connected to the inlet side bracket body 176 and the outlet side bracket body 177. 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 178 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 outlet side located on the left front side of the diesel engine 5. The bracket body 177 is connected to the outlet-side second bracket 182. 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.

  Next, a structure in which the diesel engine 5 is mounted on the tractor 1 as a work vehicle will be described with reference to FIGS. The traveling machine body 2 of the tractor 1 in the embodiment is supported by a pair of left and right rear wheels 4 as well as a pair of left and right front wheels 3 as a traveling unit. The tractor 1 is configured to travel forward and backward by driving the rear wheels 4 and the front wheels 3 with a common rail type diesel engine 5 (hereinafter simply referred to as an engine) as a power source mounted on the front portion of the traveling machine body 2. Has been. The engine 5 is covered with a bonnet 6. A cabin 7 is installed on the upper surface of the traveling machine body 2. Inside the cabin 7, a steering seat 8 and a steering handle (round handle) that moves the steering direction of the front wheel 3 to the left and right by steering. 9 are arranged. A step 10 on which the operator gets on and off is provided at the outer lower portion of the cabin 7. A fuel tank 11 that supplies fuel to the engine 5 is provided below the bottom of the cabin 7.

  The traveling machine body 2 includes an engine frame (front frame) 14 having a front bumper (frame connecting member) 12 and a front axle case 13, and left and right machine body frames (rear frame) 15 detachably fixed to the rear part of the engine frame 14. It is comprised by. A front axle 16 is rotatably protruded outward from the left and right ends of the front axle case 13. The front wheels 3 are attached to the left and right ends of the front axle case 13 via the front axle 16. A transmission case 17 is connected to the rear part of the body frame 15 for appropriately changing the rotational power from the engine 5 and transmitting it to the front and rear four wheels 3, 3, 4, 4. A tank frame 18 having a rectangular frame plate shape in a bottom view projecting outward in the left and right directions is bolted to the lower surface sides of the left and right body frames 15 and the mission case 17. The fuel tank 11 of the embodiment is divided into left and right two parts. The left and right fuel tanks 11 are distributed and mounted on the upper surface side of the left and right projecting portions of the tank frame 18. The left and right rear axle cases 19 are mounted on the left and right outer surfaces of the mission case 17 so as to protrude outward. Left and right rear axle cases 20 are rotatably inserted in the left and right rear axle cases 19. The rear wheel 4 is attached to the mission case 17 via the rear axle 20. Upper portions of the left and right rear wheels 4 are covered with left and right rear fenders 21.

  A hydraulic lifting mechanism 22 that lifts and lowers a working machine such as a rotary tiller is detachably attached to the rear upper surface of the mission case 17. A working machine such as a rotary tiller is connected to the rear portion of the transmission case 17 via a three-point link mechanism including a pair of left and right lower links 23 and a top link 24. On the rear side surface of the mission case 17, a PTO shaft 25 for transmitting a PTO driving force to a working machine such as a rotary tiller is provided to project rearward.

  A flywheel 61 is attached to an engine output shaft 53 protruding rearward from the rear side of the engine 5 so as to be directly connected. A main shaft 27 projecting rearward from the flywheel 61 and a main transmission input shaft 28 projecting forward from the front side of the transmission case 17 are connected via a power transmission shaft 29 having universal shaft joints at both ends. In the transmission case 17, a hydraulic continuously variable transmission, a forward / reverse switching mechanism, a traveling auxiliary transmission gear mechanism, and a differential gear mechanism for rear wheels are arranged. The rotational power of the engine 5 is transmitted to the main transmission input shaft 28 of the transmission case 17 via the main driving shaft 27 and the power transmission shaft 29, and is appropriately shifted by the hydraulic continuously variable transmission and the traveling auxiliary transmission gear mechanism. Then, the transmission power is transmitted to the left and right rear wheels 4 through the rear wheel differential gear mechanism.

  The front wheel output shaft 30 projecting forward from the lower front portion of the transmission case 17 projects rearward from the front axle case 13 containing a front wheel differential gear mechanism (not shown) via a front wheel drive shaft 31. A front wheel transmission shaft (not shown) is connected. Transmission power by the hydraulic continuously variable transmission and the traveling auxiliary transmission gear mechanism in the transmission case 17 is transmitted from the front wheel output shaft 30, the front wheel drive shaft 31, and the front wheel transmission shaft to the front wheel differential gear mechanism in the front axle case 13. Is transmitted to the left and right front wheels 3 via.

  The turbocharger 81 of the engine 5 includes a compressor case 83 with a built-in blower wheel. The intake side of the compressor case 83 is connected to the intake / exhaust side of the air cleaner 221 via an air supply pipe 222. The intake / discharge side 83 is connected to the upstream relay pipe 223. The turbocharger 81 includes a turbine case 82 with a built-in turbine wheel. The turbocharger 81 connects the exhaust intake side of the turbine case 82 to the exhaust gas outlet of the exhaust manifold 57, while the intake discharge side of the turbine case 82 is connected to the rear side. It connects with the exhaust-gas inlet_port | entrance of the exhaust-gas purification apparatus 52 which is a processing apparatus.

  The engine 5 connects the EGR cooler 80 and the EGR device 75 that are arranged on both side surfaces by a recirculation exhaust gas pipe 78 that bypasses the rear surface of the engine 5 (the flywheel 61 side) as a reflux line. The EGR device 75 is connected to the downstream relay pipe 225 extending forward (on the cooling fan 59 side) on the right side of the engine 5. The upstream relay pipe 223 and the downstream relay pipe 225 are respectively arranged on both sides of the engine 5, and the front upper side of the engine 5 is connected to the intercooler 224 installed on the frame frame 226 in front of the engine 5. It is extended toward. Further, the air cleaner 221 is arranged on the upper front side of the frame frame 226, and an air supply pipe 222 connected to the air cleaner 221 extends over the frame frame 226 and extends behind the left side of the engine 5.

  With the above configuration, fresh air (external air) sucked into the air cleaner 221 is removed by the air cleaner 221 and purified, and then sucked into the compressor case 83 of the turbocharger 81 through the air supply pipe 222. . The pressurized fresh air compressed in the compressor case 83 of the turbocharger 81 is supplied to the EGR main body case of the EGR device 75 via the relay pipes 223 and 225 and the intercooler 224. On the other hand, a part of the exhaust gas (EGR gas) from the exhaust manifold 57 is cooled by the EGR cooler 80 and then supplied to the EGR main body case of the EGR device 85 via the recirculation exhaust gas pipe 78.

  The exhaust gas purification device 52 is provided with an exhaust gas inlet pipe 161 on the outer peripheral surface of the case on one end side (rear side) in the longitudinal direction, and the exhaust gas inlet pipe 161 is connected to the exhaust gas of the turbine case 82 in the turbocharger 81. The exhaust side communicates with the exhaust side through an exhaust communication pipe 84. The exhaust gas purifying device 52 is provided with an exhaust gas outlet pipe 162 on the outer peripheral surface of the case on the other end side (front side) in the longitudinal direction, and the exhaust gas outlet pipe 162 is connected to the exhaust pipe 227. In the exhaust gas purification device 52, the exhaust gas inlet pipe 161 is opened toward the lower left side, while the exhaust gas outlet pipe 162 is opened upward on the right side. The exhaust pipe 227 is disposed so as to straddle the upper side of the engine 5 from the front left side of the diesel engine 5 to the rear right side. The exhaust pipe 227 is installed at a position between the exhaust gas purification device 52 and the downstream relay pipe 225 so as to be substantially parallel to the exhaust gas purification device 52 and the downstream relay pipe 225.

  Above the engine 5, the exhaust gas purification device 52 and the exhaust pipe 227 are arranged side by side so as to be parallel to the output shaft of the engine 5. That is, the exhaust gas purification device 52 and the exhaust pipe 227 are arranged side by side so that the exhaust gas purification device 52 covers the left side of the upper surface of the engine 5 while the exhaust pipe 227 covers the right side of the upper surface of the diesel engine 5. Further, on the right side of the exhaust pipe 227, a downstream relay pipe 225 for connecting the intercooler 224 and the intake communication pipe 84 is installed, and the thermal influence on the downstream relay pipe 225 by the exhaust gas purifying device 52 that becomes high temperature. Is preventing. An exhaust pipe 227 connected to the exhaust side of the exhaust gas purification device 52 is inserted into the exhaust gas intake port of the tail pipe 229 on the right rear side of the diesel engine 5.

  The tail pipe 229 has a J-shape that extends from the lower side toward the upper side toward the exhaust gas discharge side and is bent toward the diesel engine 5 on the lower side of the cabin 7 on the front right side of the cabin 7. ing. Further, the tail pipe 229 is formed such that the lower bent portion straddles the upper part of the body frame 15 from the inside to the outside. The tail pipe 229 is provided with an exhaust gas intake port provided on the inner side of the body frame 15, and the exhaust gas exhaust port of the exhaust pipe 227 is inserted into the exhaust gas intake port. That is, the connection portion between the tail pipe 229 and the exhaust pipe 227 has a double pipe structure, and exhaust gas flows into the tail pipe 229 from the exhaust pipe 227 and at the same time, a gap between the exhaust pipe 227 and the tail pipe 229. The exhaust gas flowing in the tail pipe 229 is cooled by allowing the outside air to flow in. Furthermore, the tail pipe 229 is configured to be covered with a heat shield plate 230. An engine cover 232 formed of a perforated plate is disposed on the lower left and right sides of the bonnet 6 to cover the left and right sides of the engine room.

  Next, the configuration of the engine 5 mounted in the engine room below the bonnet 6 will be described with reference to FIGS. The bonnet 6 forms a front grill 231 on the front lower side and covers the front of the engine room. An engine cover 232 formed of a perforated plate is disposed on the lower left and right sides of the bonnet 6 to cover the left and right sides of the engine room. That is, the hood 6 and the engine cover 232 cover the front, upper, and left and right sides of the diesel engine 5.

  The diesel engine 5 is connected to an engine support bracket 298 installed in the middle part of the pair of left and right engine frames 14 via an engine leg body 238 having anti-vibration rubber via an engine leg mounting part 74 provided on the lower side of the left and right side surfaces. doing. In the diesel engine 5, an engine leg mounting portion 60 a provided on the rear flywheel housing 60 is connected to the upper surface of the engine support frame 237 via an engine leg (engine mount) 240 having a vibration isolation rubber 241. .

  The engine legs 238 are bolted to the upper part of the engine support bracket 298 connected to the outside of the midway part of the pair of left and right engine frames 14 with the anti-vibration rubber on the lower side. The diesel engine 5 is sandwiched between the engine frames 14 by a pair of left and right engine legs 238 to support the front side of the diesel engine 5. The rear surface of the diesel engine 5 is connected to the front end sides of the pair of left and right body frames 15 via the support beam frame 236, the engine support frame 237, and the engine legs 240, and the diesel engine 5 is rearward at the front end of the body frame 15 The side is supported.

  Further, extendable gas springs (bonnet dampers) 256 and 256 are disposed on both the left and right sides below the bonnet 6. One end (rear end) of each of the left and right gas springs 256, 256 is pivotally attached to the engine room frame body, and the other end (front end) of each of the gas springs 256, 256 is pivotally attached to the upper inner surface of the bonnet 6. doing. Further, the bonnet 6 is held in the open position by the thrust action of the gas spring 256. Therefore, when the bonnet 6 is opened and opened by lifting the front part of the bonnet 6, the bonnet 6 can be held in the open state by the gas spring 256, so that maintenance work or the like of the diesel engine 5 can be performed.

  As shown in FIGS. 21 to 23, the bonnet 6 of the tractor 1 is formed in a U-shaped cross-section downward. Then, the left and right corners of the bonnet 6 are chamfered so as to be inclined obliquely downward to the left and right outside in a front view, so that the front view of the operator seated on the control seat 8, particularly the left and right sides of the bonnet 6, Good visibility. The exhaust gas purification device (DPF) 52 and the exhaust communication pipe 84 are opposed to the left inner wall surface of the bonnet 6, while the intake communication pipe 76 is opposed to the right inner wall surface of the bonnet 6. Further, the exhaust communication pipe 84 is disposed at a position facing the left engine cover 232, while the exhaust communication pipe 84 is disposed at a position facing the right engine cover 23.

  As shown in FIGS. 21 and 22, the intake communication pipe 76 having a hollow portion for supplying fresh air to the intake manifold 56 is inclined upward toward the cylinder head 55, and the intake manifold 56 is disposed above the intake manifold 56. It is extended to. That is, in the intake communication pipe 76, the fresh air intake port on the upper end side is offset toward the output shaft 53 (engine 5 center position) of the engine 5 with respect to the fresh air discharge port on the lower end side. The intake communication pipe 76 is arranged along the shape narrowed upward in the bonnet 6, and the intake throttle member 77 is disposed between the upper part of the engine 5 and the inner surface of the bonnet 6 than the intake communication pipe 76. Can be placed closer to the center position. Therefore, the downstream relay pipe 225 that allows the fresh air discharge side of the intercooler 224 and the intake throttle member 77 to communicate with each other can be designed to be short, and can be compactly accommodated in the hood 6 that has a narrower left and right width.

  As shown in FIGS. 21 and 22, a structure in which an exhaust communication pipe 84 having a hollow portion for supplying exhaust gas from the exhaust manifold 57 to the exhaust gas purification device 52 is inclined upward toward the cylinder head 55 side. The exhaust gas purification device 52 is supported by being connected to the exhaust gas inlet pipe 161 of the exhaust gas purification device 52. That is, the exhaust communication pipe 84 is connected to the lower end side connection support portion 84a connected to the lower end side exhaust manifold 57, and the upper end side exhaust gas discharge port is connected to the output shaft 53 (engine 5 center position) of the engine 5. It is offset closer. Further, the exhaust gas purifying device 52 inclines the exhaust gas inlet pipe 161 toward the lower side (the inlet flange body 161a side) toward the outside of the engine 5 (the inner wall side of the bonnet 6).

  The exhaust gas purification device 52 and the exhaust communication pipe 84 are arranged along a shape narrowed upward in the bonnet 6, and the exhaust gas purification device 52 is disposed between the upper portion of the engine 5 and the inner surface of the bonnet 6. It can be supported near the center position. Therefore, the exhaust gas purifying device 52 can be accommodated in a compact manner in the bonnet 6 whose lateral width becomes narrower upward. In addition, the exhaust gas purifying device 52, which is a heavy object, can be supported close to the center of gravity of the engine 5, and an increase in vibration, noise, etc. of the engine 5 due to the exhaust gas purifying device 52 being mounted can be suppressed. Further, the influence on the shape of the hood 6 due to the exhaust gas purification device 52 being assembled to the engine 5 can be reduced, and the shape of the hood 6 need not be complicated.

  As shown in FIGS. 22 and 23, a flywheel housing 60 that covers a flywheel 61 disposed on an end surface that intersects the core line of the engine output shaft 53 is configured to have a width W1 narrower than a height H1. By making the shape of the flywheel housing 60 narrower, the engine 5 can be mounted without causing the flywheel housing 60 to interfere with the traveling machine body 2 having a narrow left and right width. Further, in the traveling machine body 2, since the machine engine frame 15 is provided outside the engine frame 14 via the spacer 293, the width between the left and right machine engine frames 15 is wider than the width between the left and right engine frames 14. On the other hand, in the engine 5, the flywheel housing 61 is disposed rearward, and the main transmission input shaft 28 of the transmission case 17 connected to the body frame 15 and the flywheel 61 are connected. Accordingly, the flywheel housing 61 having the widest left-right width in the engine 5 can be sufficiently disposed between the body frames 15 and the flywheel housing 61 can be prevented from colliding with the traveling body 2 having a different vibration system. Damage can be prevented.

  The flywheel housing 61 has an outer shape in which a left and right sides of a circle are cut out and at the same time an pedestal engine leg mounting portion 60a is protruded on the upper portion, and the upper engine leg mounting portion 60a is interposed via a rear engine leg body 240. And connected to the traveling machine body 2. The flywheel housing 61 not only can be mounted on the traveling machine body 2 having a narrow width, but also forms a pedestal-shaped engine leg mounting portion 60 a that can be connected to the traveling machine body 2. Therefore, the rigidity by the support structure of the engine 5 can be compensated by connecting to the traveling machine body 2 by the flywheel housing 61 having high rigidity.

  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 2 Traveling machine body 5 Diesel engine 6 Bonnet 7 Cabin 14 Engine frame 15 Airframe frame 52 Exhaust gas purification device (DPF)
54 Cylinder block 55 Cylinder head 56 Intake manifold 57 Exhaust manifold 59 Cooling fan 60 Flywheel housing 60a Engine leg mounting part 63 Oil filter 70 Thermostat case 71 Cooling water pump 76 Intake communication pipe 84 Exhaust communication pipe 84a Connection support part 88 Oil filter support Member 89 Lubricating oil supply pipe 176 Entrance side bracket body 177 Exit side bracket body 178 Fixed bracket 179 Relay bracket 180 Extension bracket 181 Exit side first bracket 182 Exit side second bracket 195 Reinforcing plate

Claims (1)

An engine device comprising an exhaust gas purification device for purifying exhaust gas from the engine, wherein the exhaust gas purification device is mounted so as to be along the output shaft core line of the engine above the cylinder head of the engine,
An intake manifold and an exhaust manifold arranged on both sides of the cylinder head, an exhaust gas recirculation device that mixes a part of exhaust gas and fresh air in the intake manifold, and exhaust gas from the exhaust manifold. A recirculation exhaust gas pipe to be introduced into the exhaust gas recirculation device,
As a housing support that supports and fixes a gas purification housing that constitutes the exhaust gas purification device, an inlet side bracket body and an outlet side bracket body that are formed wide in a direction intersecting the output shaft of the engine,
The outlet side bracket body is located on the front side which is the cooling fan mounting side of the cylinder head,
The inlet side bracket body is positioned on the rear surface side of the cylinder head on the flywheel mounting side, and the lower end side is bolted to the rear surface of the cylinder head and the upper end side of the fixing bracket is bolted. A relay bracket, and an extension bracket connected to the relay bracket and to which an inlet side lid of the gas purification housing is fixed,
A reinforcing plate is attached to a mounting seat projecting on a surface opposite to the cylinder head of the fixing bracket, and a space in which both side edges of the reinforcing plate are opened between the reinforcing plate and the fixing bracket. Provided,
An engine apparatus configured to pass the recirculated exhaust gas pipe through the space between the inlet side bracket body and the reinforcing plate .

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