JP6295143B2 - Tractor - Google Patents

Description

The present invention relates to a tractor for agricultural.

  In recent years, due to the application of high-level exhaust gas regulations related to diesel engines, exhaust gas purification devices that purify air pollutants in exhaust gases on agricultural machinery, construction machines, ships, etc. equipped with diesel engines There is a growing demand for mounting post-processing devices. Therefore, some conventional work vehicles such as tractors have an exhaust gas purification device disposed in the engine room under the hood together with the diesel engine when the exhaust gas purification device is mounted (see Patent Document 1).

  In addition, in a work vehicle such as a tractor, a pair of fuel tanks for storing fuel supplied to the engine is configured, and the pair of fuel tanks are arranged separately on the left and right sides of the vehicle body while avoiding the engine and transmission. (See Patent Document 2).

JP 2013-116692 A JP 2010-042779 A

  By the way, when the diesel engine having the above-described exhaust gas countermeasure device is applied to a work vehicle such as a tractor, not only the diesel engine and the exhaust gas countermeasure device but also a radiator or Various parts such as batteries and electronic parts related to exhaust gas countermeasure devices must be packed.

  However, in the installation space of the work vehicle, not only the diesel engine itself but also the exhaust gas purification device becomes considerably hot due to the heat generated by the driving diesel engine. Therefore, it is necessary to adjust the temperature in the engine room so as not to be adversely affected by heat generation from the diesel engine or the exhaust gas countermeasure device, and it is necessary to examine an appropriate arrangement structure and cooling structure. Moreover, if the heating to the driver's seat arranged behind the engine room is not reduced, the comfortability of the operator is deteriorated.

  Further, when an after-treatment device such as an exhaust gas purification device is provided, it is necessary to widen the engine room space, and the bonnet also becomes large. Therefore, strength is required in the hood opening and closing structure. In particular, when the bonnet is opened, it is preferable to provide a rotation support mechanism having strength in order to concentrate the load on the fulcrum position. Furthermore, when performing maintenance or the like, easy access to the engine room is required.

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

The present invention includes an engine mounted on a front portion of a traveling machine body, and a post-processing device that purifies exhaust gas of the engine, and the post-processing device mounted on an upper portion of the engine is positioned on a rear inner side of a bonnet. , comprising a hood shield plate at least covering the post-processing apparatus from the rear by arranging the rear side of the hood, the shielding plate is disposed between the bonnet and the post-processing apparatus, the cooling fan on the front side of the engine And an upper end side of a support bracket that supports the bonnet is connected to and supported by a hinge member that is connected to and supported by a rear portion of the bonnet, and the hinge member is fixed to the bonnet side. And a fixed part fixed to the bonnet shield plate side, and the rotating part is configured to be rotatable with respect to the fixed part. A pair of expandable left and right gas springs are disposed on the left and right sides of the shielding plate below the bonnet, and one end of each of the pair of left and right gas springs is pivotally attached to a beam frame that supports the shielding plate. And the other ends of the pair of left and right gas springs are pivotally attached to the inner surface of the bonnet upper part, and by lifting the front part of the bonnet, the upper end position of the bonnet shield plate is used as an axis fulcrum. A tractor characterized by rotating a bonnet.

  In this configuration, the post-processing device is disposed in parallel with the output shaft of the engine, and the bonnet shield plate is disposed on one side of the bonnet to cover the rear of the post-processing device. A first shield surface, a second shield surface bent forward from a side edge of the first shield surface, and a third shield extending from the front edge of the second shield surface toward the other side of the bonnet And an exhaust pipe connected to the exhaust side of the aftertreatment device by opening a space between the third shield surface of the bonnet shield plate and the other side of the bonnet on the back surface of the bonnet. It is good also as what extended toward the back of the said bonnet.

  Further, the bonnet shield plate has irregularities of a predetermined period, blocks the sound generated from the engine room under the bonnet, and attenuates the noise generated from the engine by the irregularities of the bonnet shield plate. The noise propagation to the control seat may be prevented.

  The work vehicle includes a radiator for cooling the engine water, a cooling fan for cooling the engine and the radiator, and the cooling fan is disposed on a front side of the engine, and the radiator is disposed in front of the cooling fan. A front grille mounted on the upper side of the engine, covering the radiator, the cooling fan, the engine and the post-processing device with a bonnet, and formed on the front surface of the bonnet by driving the cooling fan The cooling air is taken into the bonnet, the bonnet is formed with opening holes on both the left and right sides, and a shielding plate is disposed at a position corresponding to the vicinity of the left and right sides of the radiator It is good.

  When configured in this manner, the radiator is erected at the front of the traveling machine body, and a fan shroud surrounding the cooling fan is attached to the back side of the radiator, and is provided on the bonnet when the bonnet is closed. The shielding plate may be brought into contact with the left and right sides of the fan shroud. Further, the bonnet further has an opening hole in the ceiling portion, and the fan shroud has an upper shielding portion extended in the left-right direction on the upper surface and a pair of left and right sides extended in the vertical direction on the left and right sides. And when the bonnet is closed, the upper shielding part is brought close to the back surface of the bonnet ceiling part, and the side shielding part is brought into contact with the shielding plate of the bonnet, The opening hole in each of the ceiling part and the left and right side parts of the bonnet may be positioned forward of the fan shroud.

  The work vehicle includes an engine cover formed of a perforated plate on the lower left and right rear sides of the bonnet, and an upper end position of the engine cover is positioned below the post-processing device. While releasing the air heated by the processing apparatus to the outside, the heat retention effect of the post-processing apparatus by the bonnet may be enhanced to enable the regeneration operation at a high temperature.

  According to the present invention, by arranging the heat shield plate on the aftertreatment device, it is possible to prevent the bonnet from being heated due to exhaust heat from the aftertreatment device and the engine. Since a space is formed between the bonnet and the heat shield plate, the inside of the engine room below the heat shield plate can be insulated from the outside air, and the aftertreatment device can be operated in a high temperature environment. Since the heat in the engine room under the hood is shielded by the hood shield plate, the control seat can be prevented from being heated by exhaust heat from the engine room. By providing a gap between the bonnet shield plate and the heat shield plate, it is difficult to trap hot air in the engine room, and it is possible to suppress the occurrence of heat damage to the post-processing device itself, the bonnet, and the like.

  According to the present invention, in the opening and closing operation of the bonnet, the bonnet is rotated with the upper end position of the bonnet shield plate as a fulcrum, so that the bonnet can be greatly opened rearward. Accordingly, since the worker can easily access the engine room, not only the maintenance work is facilitated, but also the contact with the bonnet is prevented, and the safety of the worker can be ensured at the time of maintenance.

  According to the present invention, heat in the engine room under the hood is shielded by the hood shield plate, so that the control seat can be prevented from being heated by exhaust heat from the engine room. Therefore, the operator in the control seat can operate comfortably without being affected by the exhaust heat of the engine and the aftertreatment device. Further, since the control seat and the bonnet are separated from each other, the bonnet can be sufficiently opened even if the outer diameter of the bonnet is increased. Therefore, even if a heating element such as a post-processing device is provided in the engine room, the influence on the bonnet due to heat radiation from the post-processing device can be reduced by increasing the capacity of the bonnet.

It is a left view of a tractor. It is a top view of a tractor. It is a right view of a tractor. It is a front view of a tractor. It is left side explanatory drawing of a traveling body. It is right side explanatory drawing of a traveling body. It is the perspective view which looked at the traveling body from diagonally left rear. It is the perspective view which looked at the traveling machine body from diagonally right rear. It is a perspective view which shows the bonnet back surface structure seen from the cabin side. It is a left side enlarged view of a tractor. It is a perspective view which shows the structure of the engine room seen from diagonally left rear. It is a perspective view which shows the structure of the engine room frame seen from diagonally right back. It is a perspective view which shows the structure of the engine room frame seen from the diagonally lower left. It is a perspective view which shows the structure of the engine room seen from the diagonally right front. It is a perspective view which shows the structure of the engine room seen from diagonally left rear. It is a disassembled perspective view which shows the structure of the opening-and-closing support mechanism of a bonnet. It is a plane sectional view showing composition in a bonnet. It is side surface sectional drawing which shows the structure in a bonnet. It is a rear view of a bonnet. It is a bottom view of a bonnet. It is a left view of the tractor at the time of opening a bonnet. It is a figure which shows the support structure of a bonnet. It is a perspective view which shows the structure in the engine room at the time of opening a bonnet.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings, taking a tractor as a work vehicle as an example.

  First, an outline of the tractor 1 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 14 having a front bumper 12 and a front axle case 13, and left and right machine body frames 15 detachably fixed to a rear portion of the engine frame 14. 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 26 is attached to an engine output shaft (not shown) projecting rearward from the rear side surface of the engine 5. A main drive shaft 27 protruding backward from the flywheel 26 and a main transmission input shaft 28 protruding 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.

  Next, the internal structure of the cabin 7 will be described with reference to FIGS. A steering column 32 is disposed in front of the control seat 8 in the cabin 7. The steering column 32 is erected in a state of being embedded in the back side of the dashboard 33 disposed on the front side inside the cabin 7. A steering handle 9 having a substantially round shape in plan view is attached to the upper end side of the handle shaft that protrudes upward from the upper surface of the steering column 32.

  The diesel engine 5 has a cylinder head mounted on a cylinder block containing an engine output shaft and a piston. The intake manifold 203 is disposed on the right side of the cylinder head, and the exhaust manifold 204 is disposed on the left side of the cylinder head. . That is, the intake manifold 203 and the exhaust manifold 204 are distributed and arranged on both side surfaces along the engine output shaft in the engine 5. The cooling fan 206 is disposed on the front surface of the cylinder block in the diesel engine 5, while the flywheel 26 is disposed on the rear surface of the cylinder block. That is, the flywheel 26 and the cooling fan 206 are arranged separately on both side surfaces intersecting the engine output shaft in the engine 5.

  The diesel engine 5 includes a fuel supply pump 207 for supplying fuel, a cylindrical common rail 208 for pumping fuel to the injector, a fuel filter 209 for removing foreign matter from the fuel from the fuel tank 11, an intake manifold 203, A connected EGR device 210 is provided on the right side surface thereof. The fuel in the fuel tank 11 is supplied to the fuel supply pump 207 by the fuel pressure pump 213 via the fuel filter 209, and then pumped to the common rail 208 from the fuel supply pump 207. Accordingly, since the high-pressure fuel is stored in the common rail 208, the high-pressure fuel in the common rail 208 is injected into each cylinder of the engine 5 from each injector by controlling the fuel injection valve of each injector.

  The diesel engine 5 includes a turbocharger 211 that compresses air using exhaust gas from the exhaust manifold 204, and an EGR cooler 212 that cools a part of the exhaust gas from the exhaust manifold 204 and recirculates it to the EGR device 210. Prepare on the left side. The turbocharger 211 includes a compressor case with a built-in blower wheel. The intake side of the compressor case is connected to the intake / exhaust side of the air cleaner 221 via the intake pipe 222, while the intake / exhaust side of the compressor case is connected. Is connected to the intake relay pipe (intake upstream side) 223. The turbocharger 211 includes a turbine case with a built-in turbine wheel. The exhaust intake side of the turbine case is connected to the exhaust gas outlet of the air manifold 204, while the intake / exhaust side of the turbine case is connected to an aftertreatment device. It is connected to an exhaust gas inlet of a certain exhaust gas purification device 224.

  In the diesel engine 5, the EGR cooler 212 and the EGR device 210 that are arranged on both side surfaces are connected by a recirculation exhaust gas pipe 214 that bypasses the rear surface of the engine 5 (on the flywheel 26 side) as a reflux line. The EGR device 210 is connected to an intake relay pipe (intake downstream side) 225 extending forward (on the cooling fan 206 side) on the right side of the engine 5. The intake relay pipes 223 and 225 are respectively arranged on both sides of the diesel engine 5, and are connected to an intercooler (not shown) installed in a frame frame 226 in front of the diesel engine 5. It extends toward the front upper side. Further, the air cleaner 221 is disposed on the upper front side of the frame frame 226, and the intake pipe 222 connected to the air cleaner 221 extends over the frame frame 226 and extends behind the left side of the diesel 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 of the turbocharger 211 via the intake pipe 222. The pressurized fresh air compressed in the compressor case of the turbocharger 211 is supplied to the EGR main body case of the EGR device 210 via the intake relay pipes 223 and 225 and the intercooler. On the other hand, a part of the exhaust gas (EGR gas) from the exhaust manifold 204 is cooled by the EGR cooler 212 and then supplied to the EGR main body case of the EGR device 210 via the recirculation exhaust gas pipe 214.

  The EGR device 210 mixes the pressurized fresh air from the turbocharger 211 and the EGR gas from the exhaust manifold 204, and then supplies the mixed gas to the intake manifold 203. That is, a part of the exhaust gas discharged from the diesel engine 5 to the exhaust manifold 204 is recirculated to the intake manifold 203, whereby the maximum combustion temperature during high load operation is lowered, and NOx (nitrogen oxidation from the diesel engine 5). Waste) will be reduced.

  The diesel engine 5 includes a continuous regeneration type exhaust gas purification device 224 (DPF). The exhaust gas purification device 224 removes particulate matter (PM) in the exhaust gas discharged from the engine 5 and reduces carbon monoxide (CO) and hydrocarbons (HC) in the exhaust gas. An exhaust gas purification device 224 is disposed above the exhaust manifold 204 on the upper surface side of the diesel engine 5. The exhaust gas purification device 224 has a substantially cylindrical shape extending long in the front-rear direction parallel to the output shaft (crankshaft) of the diesel engine 5, and both front and rear sides of the exhaust gas purification device 224 (upstream in the exhaust gas movement direction). And the downstream side) are provided with an exhaust gas inlet and an exhaust gas outlet.

  The exhaust gas purification device 224 has an exhaust gas inlet provided on the outer peripheral surface of the case on one end side (rear side) in the longitudinal direction, and the exhaust gas inlet is connected to the exhaust gas discharge side of the turbine case in the turbocharger 211. . The exhaust gas purification device 224 has an exhaust gas outlet provided on the outer peripheral surface of the case on the other end side (front side) in the longitudinal direction, and the exhaust gas outlet is connected to the exhaust pipe 227. In the exhaust gas purification device 224, the exhaust gas inlet opens downward, while the exhaust gas outlet opens upward on the right side. The exhaust pipe 227 is disposed so as to straddle the upper part of the diesel engine 5 from the front left side to the rear right side of the diesel engine 5.

  The lower end side of the exhaust relay bracket 215 constituting the support body (DPF support body) of the exhaust gas purification device 224 is bolted to the exhaust manifold 204. The exhaust relay bracket 215 forms an exhaust relay pipe as an exhaust relay path on the upper side thereof. The exhaust relay bracket 215 bolts the exhaust intake side of the exhaust relay pipe to the exhaust discharge side of the turbine case in the turbocharger 211, while the exhaust discharge side of the exhaust relay pipe 85 is connected to the exhaust gas purification device 224. It is fastened to the exhaust gas inlet. Therefore, the exhaust manifold 7 and the exhaust gas purification device 224 communicate with each other via the turbine case in the turbocharger 211 and the exhaust relay pipe of the exhaust relay bracket 215.

  The engine 5 includes an outlet side bracket body 216 and an inlet side bracket body 217 as a housing support body that supports and fixes the exhaust gas purification device 224. The outlet side bracket body 216 and the inlet side bracket body 217 are arranged upright on the front side and the rear side that intersect the engine output shaft in the cylinder head of the engine 5. The inlet side bracket body 217 is located on the rear surface side of the engine 5 and supports the exhaust intake side of the exhaust gas purification device 224. The outlet side bracket body 216 is located on the front side of the engine 5 and supports the exhaust discharge side of the exhaust gas purification device 224.

  The lower end side of the inlet side bracket body 217 is bolted to the rear surface of the cylinder head in the engine 5. The upper end side of the inlet side bracket body 217 is fastened to the inlet side lid body of the exhaust gas purifying device 224 via the relay bracket 219. In addition, a part of the rear surface on the lower end side of the inlet side bracket body 217 is protruded, and the support plate 218 is fastened to the protrusion portion. By arranging the inlet-side bracket body 217 and the support plate 218 in the front-rear direction and connecting them, the EGR device 210 is interposed between the inlet-side bracket body 217 and the support plate 218 without impairing the support strength of the exhaust gas purification device 224. And a recirculation exhaust gas 214 for connecting the EGR cooler 212 to each other can be provided.

  Above the diesel engine 5, the exhaust gas purifying device 224 and the exhaust pipe 227 are arranged side by side so as to be parallel to the output shaft of the diesel engine 5. That is, the exhaust gas purification device 224 and the exhaust pipe 227 are arranged side by side so that the exhaust gas purification device 224 covers the left side of the upper surface of the diesel engine 5 while the exhaust pipe 227 covers the right side of the upper surface of the diesel engine 5.

  The exhaust pipe 227 connected to the exhaust side of the exhaust gas purification device 224 is connected to the tail pipe 229 via a bellows pipe 228 erected on the rear right side of the diesel engine 5. The tail pipe 229 extends from the lower side to the upper side on the front right side of the cabin 7 and has a shape bent toward the diesel engine 5 on the lower side of the cabin 7. 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. Further, the tail pipe 229 is configured to be covered with a heat shield plate 230 except for the upper end portion thereof.

  Next, the configuration of the engine room frame under the hood 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 pair of left and right engine frames 14 have their front end side inner surfaces connected to the left and right outer surfaces of the axle case connecting member 295. The lower side of the axle case connecting portion 295 is provided with a connecting portion in which the positions of the four corners of the front, rear, left and right are protruded downward. The connecting portion is connected to the front axle case 13 and the front axle case 13 is suspended from the engine frame 14. I support it. The front bumper 12 is installed at a position in contact with the front end surface of the engine frame 14 by being connected to the front surface of the axle case connecting portion 295.

  A frame bottom plate 233 is installed on the upper edges of the left and right engine frames 14 and the upper surface of the front bumper 12 so as to cover the upper front side of the engine frame 14. The lower surface of the frame bottom plate 233 is connected to the side surfaces of the left and right engine frames 14 via a connection bracket 233a. Each of the connection brackets 233a arranged on the left and right sides has one end connected to the side surface of the engine frame 14 and the other end connected to the side edge side of the lower surface of the frame bottom plate 233. An under cover 296 that covers the lower front side of the engine 5 is disposed at the rear end of the frame bottom plate 233. The under cover 296 has a front end connected to the frame bottom plate 233 and a rear left and right side edge connected to the left and right engine frames 14. The under cover 296 includes a front part that extends from the rear end of the frame bottom plate 233 toward the lower end of the engine frame 14, and a rear part that extends forward and below the engine 5.

  A radiator 235 having a fan shroud 234 attached to the back side is erected on the frame bottom plate 233 so as to be positioned on the front side of the engine 5. The fan shroud 234 surrounds the outer peripheral side of the cooling fan 206 and allows the radiator 235 and the cooling fan 206 to communicate with each other. The fan shroud 234 has an upper shielding part 234a whose upper end has a T-shaped cross section, and a side shielding part 234b that protrudes from the left and right side surfaces. The upper shielding portion 234a is disposed so as to extend in the left-right direction over the entire upper surface of the fan shroud 234, and has a configuration in which the upper end thereof is brought close to the lower surface of the ceiling portion 259 of the bonnet 6 when the bonnet 6 is closed. The pair of left and right side shielding portions 234b are arranged so as to extend in the vertical direction over the entire left and right side surfaces of the fan shroud 234, and when the bonnet 6 is closed, the left and right ends thereof are side portions 273 of the bonnet 6. It has the structure made to adjoin with an inner surface.

  A rectangular frame-shaped frame 226 is erected on the frame plate 233 on the front side of the radiator 235. A frame frame 226, a radiator 235, and a fan shroud 234 are arranged in this order from the front above the axle case connecting portion 295 that bridges the left and right engine frames 14. The frame frame 226 is formed so that the rear surface is covered with the radiator 235, and the front surface and the left and right side surfaces thereof are covered with a mesh plate. In the frame frame 226, an oil cooler, a fuel cooler, and the like are installed in addition to the above intercooler. An air cleaner 221 is disposed above the front surface of the frame frame 226. As a result, the cooling air sucked from the front grille 231 flows toward the frame frame 226 behind the front grille 231, thereby cooling the air cleaner 221 and cooling the intercooler, oil cooler, and fuel cooler in the frame frame 226. To do. In addition, the cooling air from the front reaches the radiator 235 provided on the rear surface of the frame frame 226, thereby enhancing the cooling effect on the cooling water supplied to the diesel engine 5.

  The front end sides of the left and right fuselage frames 15 are connected to the rear end sides of the left and right engine frames 14 via spacers 297, and the left and right fuselage frames 15 are arranged so as to sandwich the left and right engine frames 14. Yes. The pair of left and right body frames 15 are connected to the front lower side of the floor plate 40 by support beam frames 236. The connection surface (outer surface) of the support beam frame 236 with the body frame 15 is the same surface as the connection surface (outer surface) of the spacer 297 with the body frame 15. The support beam frame 236 is bolted to the left and right airframe frames 15 to mount the left and right airframe frames 15, and the engine support frame 237 is mounted on the upper surface thereof. The engine support frame 237 has a shape that surrounds the flywheel 26 of the diesel engine 5 together with the support beam frame 236 by fastening the lower end surface of the engine support frame 237 with the upper surface of the support beam frame 236.

  The diesel engine 5 has an engine support in which an engine leg mounting portion (not shown) provided on the lower side of the left and right side surfaces is installed in the middle of the pair of left and right engine frames 14 via an engine leg 238 having a vibration isolating rubber 239. The bracket 298 is connected. In the diesel engine 5, an engine leg mounting portion (not shown) provided on the rear surface is connected to the upper surface of the engine support frame 237 via an engine leg body 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 239 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. The diesel engine 5 is supported on the traveling machine body 2 by the left and right front vibration isolation rubber 239 and the left and right rear vibration isolation rubber 241.

  A pair of left and right support columns 242 and 243 are erected on the upper surface of the engine support frame 237 so as to sandwich the engine leg 240 from the left and right. Specifically, the left column frame 242 is erected via the support bracket 242a at the left rear position of the engine leg 240, and the right column frame 243 is disposed via the support bracket 243a at the right front position of the engine leg 240. Stand up. The support bracket 242a is installed behind the left edge side of the engine support frame 237, and the support bracket 243a is installed ahead of the right edge side of the engine support frame 237. A bonnet shield plate (shield plate) 244 covering the rear of the bonnet 6 is connected to the pair of left and right support frames 242 and 243 so that the lower edge thereof is separated from the upper surface of the engine leg 240.

  The bonnet shield plate 244 has a bent shape in plan view. That is, the bonnet shield plate 244 includes a rear shield surface (first shield surface) 245 that extends from the outer side (left side) of the left column frame 242 to the right and substantially parallel to the front surface of the windshield 321, and the right side of the rear shield surface 245. Side shield surface (second shield surface) 246 bent toward the front at the edge, and connection surface bent toward the right at the front edge of the side shield surface 245 and connected to the right column frame 243 (Third shield surface) 247. The rear shield surface 245 is connected to the left column frame 242 and has a left edge projecting outward (left side) from the left column frame 242 and is disposed away from the front surface of the windshield 321. The side shield surface 246 is disposed on the right side of the upper surface of the engine leg 240. The connection surface 247 is connected to the right column frame 243 so that the right edge thereof is arranged to coincide with the front surface of the right column frame 243.

  Inside the bonnet 6, a bonnet shield plate 244 is disposed on the back side of the bonnet 6 to cover at least the back surfaces of the exhaust gas purification device 224 and the exhaust pipe 227. The bonnet shield plate 244 has a shape protruding to the left side of the left column frame 242 so as to cover at least the left side (exhaust manifold 204 side) rear surface of the diesel engine 5. The bonnet shield plate 244 covers the entire rear surface of the diesel engine 5 by connecting both edges to a pair of left and right support columns 242 and 243. On the back side of the bonnet 6, an area on the right side of the bonnet shield plate 244 is opened, and a bellows pipe 228 and a part of the tail pipe 229 connected to the exhaust pipe 227 are arranged in the area.

  By covering the back of the hood 6 with the hood shield plate 244, heat in the engine room under the hood 6 is shielded by the hood shield plate 244, and the cabin 7 side is heated by exhaust heat from the engine room. Can be prevented. Therefore, the operator in the cabin 7 can operate comfortably without being affected by the exhaust heat of the diesel engine 5 and the exhaust gas purification device 224. By disposing the bonnet shield plate 244 away from the front surface of the cabin 7, a heat insulating layer is formed between the cabin 7 disposed behind the bonnet 6 and the bonnet shield plate 244.

  Further, the bonnet shield plate 244 is provided with irregularities with a predetermined period on the rear shield surface 245 to block sound generated from the engine room under the bonnet 6. Specifically, the bonnet shield plate 244 is provided with rectangular convex portions 245a protruding rearward on the rear surface of the rear shield surface 245 at predetermined intervals in the vertical direction. By providing the bonnet shield plate 244 with unevenness, noise generated from the diesel engine 5 in the engine room below the bonnet 6 can be attenuated by the unevenness of the bonnet shield plate 244 to prevent noise propagation into the cabin 7. .

  A pair of left and right beam frames 248 and 249 are installed above the fan shroud 234 and the bonnet shield plate 244, respectively. One end (rear end) of the left beam frame 248 is connected to the left column frame 242 via the rear shield surface 245 of the bonnet shield plate 244. One end (rear end) of the right beam frame 249 shorter than the left beam frame 248 is connected to the right column frame 243 through the connection surface 247 of the bonnet shield plate 244. The other ends (rear ends) of the pair of left and right beam frames 248 and 249 are connected to the upper rear surface of the fan shroud 234 via a connection bracket 234c. Since the fan shroud 234 and the bonnet shield plate 244 that are stably supported by the traveling machine body 2 are erected and connected by a pair of beam frames 248 and 249, these members are integrated into a robust engine room frame body as a whole. Can be configured.

  A heat shield plate 250 having left and right edges fixed to a pair of left and right beam frames 248 and 249 is provided. The heat shield plate 250 has the beam frames 248 and 249 installed so as to cover the rear from the middle part of the beam frames 248 and 249 under the bonnet 6. The heat shield plate 250 is disposed so as to cover the exhaust gas purifying device 224 and the upper part of the exhaust pipe 227 above the diesel engine 5. Since the heat shield plate 250 is fixed so as to bridge the beam frames 248 and 249, the beam frames 248 and 249 are reinforced by the heat shield plate 250, and the engine room frame can be made more robust. Further, by disposing the heat shield plate 250 between the exhaust gas purifying device 224 and the exhaust pipe 227 and the bonnet 6, it is possible to prevent the bonnet 6 from being heated due to exhaust heat from the engine room.

  An exhaust gas purification device 224 mounted on the upper part of the diesel engine 5 is positioned behind the bonnet 6, and a heat shield plate 250 is disposed between the bonnet 6 and the exhaust gas purification device 224. By disposing the heat shield plate 250 on the exhaust gas purification device 224, it is possible to prevent the bonnet 6 from being heated by exhaust heat from the exhaust gas purification device 224 and the diesel engine 5. Further, a space can be formed between the bonnet 6 and the heat shield plate 250 to insulate the engine room below the heat shield plate 250 from the outside air, and the exhaust gas purification device 224 can be operated in a high temperature environment. .

  Further, in addition to the heat shield plate 250, a bonnet shield plate 244 that is disposed on the back side of the bonnet 6 and covers at least the exhaust gas purifying device 224 from the back side is provided. The heat in the engine room under the hood is shielded by the hood shield plate 244 together with the heat shield plate 250, so that the cabin 7 can be prevented from being heated by exhaust heat from the engine room. Further, by providing a gap between the bonnet shield plate 244 and the heat shield plate 250, it is difficult to trap hot air in the engine room under the bonnet 6, and heat damage to the exhaust gas purifying device 224 itself, the bonnet 6 and the like is prevented. Generation can be suppressed.

  A diesel engine 5 mounted on the front of the traveling machine body 2, an exhaust gas purification device 224 disposed on the diesel engine 5 to purify exhaust gas of the diesel engine 5, and a cooling fan 206 for air cooling of the diesel engine 5. Is provided. A cooling fan 206 is disposed on the front side of the diesel engine 5, a fan shroud 234 that covers the cooling fan 206 is fixed to the traveling machine body 2, and the cooling fan 206, the diesel engine 5, and the exhaust gas purification device 224 are covered with the bonnet 6. A bonnet shield plate 244 that covers the back of the diesel engine 5 is disposed on the back of the hood 6, and the bonnet shield plate 244 is fixed to the traveling machine body 2. A pair of left and right beam frames 248 and 249 are installed above the fan shroud 234 and the bonnet shield plate 244, respectively.

  A wiper 251 for removing water droplets on the windshield 321 is pivotally attached to the windshield 321. The wiper 251 has a drive shaft 252 inserted into the cabin 7 through the windshield 321 and rotates around the drive shaft 252. The front of the drive shaft 252 of the wiper 251 is covered with the rear shield surface 245 of the bonnet shield plate 244. That is, the drive shaft 252 of the wiper 251 that wipes off the windshield 321 that covers the front surface of the cabin 7 mounted on the traveling machine body 2 is covered with the rear upper surface of the bonnet 6 when viewed from the front. Thereby, it can suppress that rainwater falls directly on the drive shaft 252 of the wiper 251, and the drive mechanism of the wiper 251, and can improve the beauty | look.

  Further, a through hole 253 is provided in a part of the windshield 321, and the hydraulic pump 254 supported inside the cabin 7 is projected from the through hole 253 to the outside of the cabin 7. The through hole 253 is installed at a position facing the connection surface 247 of the bonnet shield plate 244. Therefore, when the hydraulic pump 254 is disposed so as to protrude from the through hole 253 to the outside of the cabin 7, it is possible to prevent the bonnet shield plate 244 from being buffered. Further, since the front surface of the hydraulic pump 254 is covered by the bonnet shield plate 244, heating due to heat radiation from the engine room in the bonnet 6 is prevented.

  The bonnet shield plate 244 is provided with a rear shield surface 245 that covers the rear of the exhaust gas purification device 224 serving as a high-temperature heat source, thereby providing an installation space for the exhaust gas purification device 224 and a rear portion of the exhaust pipe 227. By disposing behind the connecting surface 244 to cover, an installation space for the hydraulic pump 254 is provided behind the connecting surface 244. That is, by bending the bonnet shield plate 244 in a crank shape in plan view, a space in which the influence of exhaust heat from the engine room side is reduced can be expanded in front of the cabin 7 (control seat 8). 254 can be optimally arranged.

  A bonnet support bracket 255 is provided on the upper edge of the front surface of the bonnet shield plate 244 in order to turn and support the rear of the bonnet 6. The bonnet support bracket 255 has a shape in which both left and right edges are bent, and is fixed to the rear shield surface 245 and the side shield surface 246 of the bonnet shield plate 244. That is, the bonnet support bracket 255 connects the back surface to the rear shield surface 245 and connects the side surface bent at the right edge side to the side shield surface 246.

  Further, as shown in FIG. 16, the upper end side of the bonnet support bracket 255 is connected to and supported by a hinge member 263 that is connected to and supported by the rear portion of the bonnet 6. The side shield surface 246 of the bonnet shield plate 244 has a notch 246 a on the upper edge side, and a part of the right side surface of the bonnet support bracket 255 can be accessed from the outside of the bonnet shield plate 244. In the bonnet support bracket 255, a temporary fixing pin 255a for temporarily fixing the hinge member 263 connected to the bonnet 6 is protruded from each of the left and right outer surfaces. The bonnet support bracket 255 includes a nut 255b for connecting the hinge member 263 to a position above the temporary fixing pin 255a on each of the left and right inner surfaces.

  Stretchable gas springs (bonnet dampers) 256 and 256 are disposed on the left and right sides of the heat shield plate 250 below the bonnet 6. One end (rear end) of each of the pair of left and right gas springs 256, 256 is pivotally attached to the rear end side of each of the pair of left and right beam frames 248, 249, and the other end (front end) of each of the gas springs 256, 256 is The bonnet 6 is pivotally attached to the upper inner surface. Therefore, by lifting the front part of the bonnet 6, the bonnet 6 can be opened with the upper end position of the bonnet shield plate 244 as an axis fulcrum, and maintenance work of the diesel engine 5 can be performed.

  As shown in FIGS. 1 to 4 and 17 to 23, the bonnet 6 includes a front grille 231 at the center of the front surface, and front lights 257 and 258 are arranged vertically on the left and right sides of the front grille 231. Yes. The ceiling part 259 on the upper side of the bonnet 6 has a shape that is inclined obliquely upward from the front to the rear. The space behind the ceiling portion 259 is widened, and a space for accommodating the exhaust gas purifying device 224 can be formed in the engine room inside the bonnet 6. The bonnet 6 has an opening hole 268 in front of each of the left and right side surface portions 269, and takes in cooling air from the left and right sides of the bonnet 6 through the opening hole 268. Further, the bonnet 6 is provided with an opening hole 270 in front of the ceiling portion 259, and the cooling air is taken in from the upper front side of the bonnet 6 through the opening hole 270.

  By forming the space by sufficiently separating the heat shield plate 250 that covers the upper side of the exhaust gas purification device 224 and the ceiling portion 259 of the bonnet 6, the heat balance in the engine room can be maintained well. Further, by arranging the front grille 231 for taking in cooling air in a wide area in the center of the front surface of the bonnet 6, cooling air can be supplied moderately into the engine room, and accumulation of heat in the hood 6 can be prevented. Furthermore, since the opening holes 268 and 270 are provided also in the front side of the both sides 269 of the bonnet 6 and the ceiling part 259, the cooling structure in the engine room under the bonnet 6 can be optimized.

  Since the engine cover 232 having punch holes on the entire surface is disposed in a wide area on the lower left and right rear sides of the bonnet 6, the air heated by the diesel engine 5 and the exhaust gas purification device 224 can be discharged to the outside. On the other hand, by positioning the upper end position of the engine cover 232 below the exhaust gas purification device 224, the heat retention effect of the exhaust gas purification device 224 by the bonnet 6 is enhanced, and a regeneration operation at a high temperature is possible.

  As shown in FIGS. 16 to 23, the ceiling portion 259 of the bonnet 6 has a shape in which a notch portion 260 is provided at the rear edge thereof, and is arranged on the drive shaft 252 of the wiper 251 behind the notch portion 260. The drive shaft 252 is covered with the rear portion of the ceiling portion 259 of the bonnet 6 when the bonnet 6 is viewed from the front. The bonnet 6 is fixed to the rear surface of the ceiling portion 259 with a rear frame frame 261 that hangs the rear side of the ceiling portion 259 in the left-right direction and a midway frame frame 262 that lays the middle portion of the ceiling portion 259 in the left-right direction. Yes. The rear frame frame 261 and the midway frame frame 262 have a shape curved along the inner peripheral surface of the bonnet 6, and both end portions of the rear frame frame 261 and the midway frame frame 262 are connected to the bonnet 6. The left and right side surface portions 269 are fixed to the inner surface.

  On the back surface side of the ceiling portion 259, a bonnet side connecting member (support member) 264 that is externally fitted and fixed to the hinge member 263 of the bonnet support bracket 255 is provided at the center position of the rear frame frame 261. A vertical frame 271 extends forward and backward with respect to the ceiling portion 259 of the bonnet 6 to connect the left and right center position of the rear frame frame 261 and the left and right center position of the midway frame frame 262. The bonnet side connecting member 264 is also connected to a vertical frame 271 whose rear end is fixed to the rear frame frame 261.

  A left rear shielding member (shield plate) 266 that extends the upper side of the rear shield surface 245 of the bonnet shield plate 244 is provided on the rear surface side of the ceiling portion 259 on the left side of the rear end of the hinge member 263. A right rear shielding member (shield plate) 267 that extends the connection surface 246 of the bonnet shield plate 244 is provided at a position on the right side of the rear end of the bonnet side connecting member (support member) 264. The connecting plate member 272 is connected to the rear surface of the ceiling portion 259 at a position rearward of the rear frame frame 21 and is disposed at the left side position of the bonnet side connecting member 264. The left rear shielding member 266 is connected to the rear edge of the connecting plate member 272. The right rear shielding member 267 is connected to the rear edge of the rear frame frame 21.

  In the bonnet 6, a shielding protrusion (shielding plate) 273 protruding from the inner surface of the left and right side surface portions 269 extends in the vertical direction, and the tip of the shielding protrusion 273 is fitted with a seal member 274. The shielding protrusion 273 is disposed at a position corresponding to the vicinity of the left and right side portions of the radiator 235. More specifically, the shielding plate 273 protrudes from the opening 268 of the bonnet 6 so as to extend vertically along the rear edge of the opening 268. Therefore, when the bonnet 6 is closed, the shielding projection 273 comes into contact with the side shielding part 234b of the fan shroud 234 located on the back surface of the radiator 235.

  The midway frame 262 is provided with shafts 265 projecting inward at the upper positions of the left and right surfaces bent downward on the left and right sides of the ceiling 259, and the front ends of the pair of left and right gas springs 256 are respectively It is pivotally attached to the shaft 265. A rod 256a is inserted into the rear end of each of the left and right gas springs 256. Support portions 248a and 249a that pivotally support the rear end of the rod 256a of the gas spring 256 are provided on the rear ends of the beam frames 248 and 249, respectively. As shown in FIG. 22, when the bonnet 6 is opened, the gas spring 256 extends the rod 256a and simultaneously rotates with respect to the support portions 248a and 249 to support the front side of the bonnet 6 with the intermediate frame frame 262. To do.

  The hinge member 263 includes a rotating portion 275 fixed to the bonnet 6 and a fixing portion 276 fixed to the bonnet shield plate 244. The rotating portion 275 is pivotally attached to the fixing portion 276 so as to be rotatable. The configuration is as follows. The rotating part 275 is fastened to the bonnet side connecting member 264 fixed to the ceiling part 259 and is fixed to the back surface of the ceiling part 259. The fixing portion 276 has a substantially U-shape (U-shape) in plan view by bending both left and right edges. The left and right side surfaces of the fixing portion 276 have a notch groove 263a in which a part of the lower edge is notched upward and a bolt insertion hole 263b into which the bolt 255c is inserted. A shaft cylinder 277 extending in the left-right direction is provided at the rear end of the rotating portion 275, and the left and right ends of the core rod (rotating shaft) 278 inserted into the shaft cylinder 277 are pivoted at the upper ends of the left and right side surfaces of the fixing portion 276. I wear it.

  As shown in FIG. 16, the hinge member 263 has the fixed portion 276 fitted from above the bonnet support bracket 255 and the fixed portion 276 is disposed so as to cover the front of the bonnet support bracket 255. At this time, the temporary fixing pin 255a of the bonnet support bracket 255 is fitted into the notch groove 263a of the fixing portion 276, so that the hinge member 263 can be guided to the fixing position with respect to the bonnet support bracket 255. That is, the temporary fixing pin 255a is inserted into the notch groove 263a so that the inside of the left and right side surfaces of the fixing portion 276 is in contact with the outside of the left and right side surfaces of the bonnet support bracket 255. It fixes to 255.

  Then, the nut 255d is screwed to the temporary fixing pin 255a of the bonnet support bracket 255, and the bolt 255c is screwed to the nut 255b of the bonnet support bracket 255, and the hinge member 263 is fastened to the bonnet support bracket 255. That is, the nut 255d is fastened to the temporary fixing pin 255a inserted into the notch groove 263a of the fixing portion 276, and the bolt 255c inserted into the bolt insertion hole 263b of the fixing portion 276 is fastened to the nut 255b. 276 is fixed to the bonnet support bracket 255. At this time, since the fixed section 276 and the bonnet support bracket 255 form a rectangular cross section frame, the hinge member 263 can be supported with high rigidity with respect to the bonnet support bracket 255, and sufficient support strength when the hood 6 is opened. Can be obtained.

  A bonnet shield plate 244 covering the back of the diesel engine 5 is fixed to the traveling machine body 2 and disposed on the back of the bonnet 6, and a heat shield plate 230 is disposed between the bonnet 6 and the exhaust gas purification device (post-treatment device) 224. doing. In the opening / closing operation of the bonnet 6, the bonnet 6 is rotated with the upper end position of the bonnet shield plate 244 as a fulcrum.

  The bonnet shield plate 244 is disposed away from the front of the cabin 7 disposed behind the bonnet 6, and beam frames 248 and 249 that are parallel to the traveling machine body 2 are provided on both sides of the front surface of the bonnet shield plate 244. Yes. The bonnet 6 includes a hinge member 263 having a rotating portion 275 connected to the rear end position of the bonnet 6 and a damper (gas spring) 256 that extends and contracts with one end connected to the front side of the bonnet 6. The fixing portion 276 of the hinge member 263 is connected to a bonnet support portion (bonnet support bracket) 255 provided on the upper edge side of the bonnet shield plate 255, and the other end of the damper 256 is rotatably supported by the beam frames 248 and 249. ing.

  As shown in FIG. 17, with the hood 6 closed, the shielding projections 273 projecting on the inner sides of the side surfaces 269 of the bonnet 6 are brought into contact with the side shielding portions 234 b provided on the side surfaces of the fan shroud 234. The cooling air taken in from the opening 268 provided in front of the shielding protrusion 273 flows backward in the space outside the frame frame 226 and the radiator 235 in the bonnet 6 by the shielding protrusion 273 and the side shielding part 234b. Is cut off. Accordingly, the cooling air sucked from the opening 268 forcibly passes through the mesh of mesh plate materials on the front surface and the left and right side surfaces of the frame frame 226.

  As shown in FIG. 18, the back surface of the ceiling portion 259 of the bonnet 6 is brought close to the upper shielding portion 234a provided on the upper surface of the fan shroud 234 with the hood 6 closed. The cooling air taken in from the opening 270 located in front of the upper shielding part 234a is partially blocked by the upper shielding part 234a in the backward flow in the space outside the frame frame 226 and the radiator 235 in the bonnet 6. Is done. Therefore, most of the cooling air sucked from the opening 268 forcibly passes through the mesh of mesh-like plate material on the front surface and the left and right side surfaces of the frame frame 226.

  As described above, with the hood 6 closed, the shielding protrusion 273 and the side shielding part 234b are located behind the opening 268, and the upper shielding part 234a is located behind the opening 270. Can suck a large amount of cooling. Therefore, the cooling effect of various cooling members such as the radiator 235 and the intercooler provided in front of the engine room can be enhanced. Further, since a large amount of cooling air can be sucked by the cooling fan 206 surrounded by the fan shroud 234, the cooling air can be supplied to the engine 5 serving as a heating element, so that the heat balance in the engine room is good. it can.

  The bonnet 6 has opening holes 268 in the left and right side portions (side surface portions) 269, and a shielding plate (shielding projection portion) 273 is disposed at a position corresponding to the vicinity of the left and right side portions of the radiator 235. Therefore, the cooling air sucked from the opening hole 268 is sent to the front surface side of the radiator 235, the amount of cooling air passing through the radiator 235 is increased, and the radiator 235 can be efficiently air-cooled. Further, a radiator 235 is erected on the front portion of the traveling machine body 2, and a fan shroud 234 surrounding the cooling fan 206 is attached to the back side of the radiator 235, and a shielding plate provided on the bonnet 6 when the bonnet 6 is closed. 273 is brought into contact with the left and right sides of the fan shroud 234.

  The bonnet 6 further has an opening 270 formed in the ceiling portion 259, and the fan shroud 234 has an upper shielding portion 234a extended in the left-right direction on the upper surface and a pair of left and right sides extended in the up-down direction on the left and right side surfaces. And a side shield 234b. When the bonnet 6 is closed, the upper shielding part 234a is brought close to the back surface of the ceiling part 259 of the bonnet 6 and the side shielding part 234b is brought into contact with the shielding plate of the bonnet 6. The opening holes 270 and 268 of the ceiling part 259 and the left and right side parts 269 of the bonnet 6 are positioned in front of the fan shroud 234.

  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 Running body 3 Front wheel 4 Rear wheel 5 Engine 6 Bonnet 7 Cabin 10 Step 11 Fuel tank 12 Front bumper 14 Engine frame 15 Airframe frame 26 Flywheel 203 Intake manifold 204 Exhaust manifold 206 Cooling fan 209 Fuel filter 213 Fuel pressure feed pump 224 Exhaust gas purification device 227 Exhaust pipe 231 Front grill 232 Engine cover 236 Support beam frame 237 Engine support frame 242 Left column frame 243 Right column frame 244 Bonnet shield plate 245 Rear shield surface 246 Side shield surface 247 Connection surface 248 Beam frame 249 Beam frame 250 Heat shield 251 Wiper 252 Drive shaft 253 Through hole 254 Hydraulic pump 255 Bonnet support bracket 256 Gas Ring 259 ceiling 260 notch 261 rear frame frame 262 midway framework 263 hinge member 264 support member 265 shaft 266 shielding plate (left)
267 Shield plate (right)
268 Opening hole 269 Side surface part 270 Opening hole 271 Vertical frame 272 Connecting plate material 273 Shielding protrusion (shielding plate)
274 Seal member 275 Rotating part 276 Fixed part 277 Shaft cylinder 278 Core rod (rotating shaft)

Claims (1)

An engine mounted on the front part of the traveling machine body, and a post-treatment device for purifying exhaust gas of the engine,
The post-processing device mounted on the upper part of the engine is located on the rear inner side of the bonnet ,
A hood shield plate disposed on the back side of the bonnet and covering at least the post-processing device from the back ;
A shielding plate is disposed between the bonnet and the post-processing device;
A cooling fan is arranged on the front side of the engine,
The support bracket upper end side that supports the bonnet is connected to and supported by a hinge member that is connected to and supported by the rear portion of the bonnet,
The hinge member includes a rotating part fixed to the bonnet side and a fixing part fixed to the bonnet shield plate side, and the rotating part is configured to be rotatable with respect to the fixing part,
A pair of expandable left and right gas springs are disposed on the left and right sides of the shielding plate below the bonnet, and one end of each of the pair of left and right gas springs is pivotally attached to a beam frame that supports the shielding plate. The other ends of the pair of left and right gas springs are pivotally attached to the inner surface of the bonnet upper part,
A tractor characterized in that the bonnet is rotated by lifting the front part of the bonnet with the upper end position of the bonnet shield plate as an axis fulcrum.

Images