JP2016180354A - Work vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent various components in an engine room from being influenced by exhaust heat of a diesel engine or an exhaust emission control device in a work vehicle.SOLUTION: A work vehicle of this invention includes an engine 8 mounted on a travel machine body 1, and an exhaust emission control device 54 for purifying exhaust gas of the engine 8. A power take-out part 20 for taking out power of the engine 8 through a flywheel 72 in a flywheel housing 71 is provided in the engine 8. The power take-out part 20 is positioned in a rear part side of the travel machine body 1, and the exhaust emission control device 54 is disposed on an upper side of the power take-out part 20. An air cleaner 109 for purifying air introduced into the engine 8 is disposed on either right or left side of the engine 8. A lateral heat shielding plate body 112 for shielding heat from the exhaust emission control device 54 is arranged between the exhaust emission control device 54 and the air cleaner 109.SELECTED DRAWING: Figure 12

Description

  The present invention relates to a work vehicle such as a speed sprayer for spraying a chemical solution in an orchard or the like, a tractor for agricultural work, or a wheel loader for civil engineering work.

  Conventionally, a diesel particulate filter or a selective catalytic reduction denitration device as an exhaust gas purification device (post-processing device) is provided in the exhaust path of the diesel engine, and the diesel engine is provided by the diesel particulate collection filter or the selective catalyst reduction denitration device. A technique for purifying an air pollutant in exhaust gas discharged from a gas is well known (see Patent Documents 1 to 3, etc.).

JP 2000-145430 A Japanese Patent Laid-Open No. 2003-27922 JP 2008-82201 A

  By the way, when the exhaust gas purifying device and the diesel engine described above are applied to a work vehicle such as a speed sprayer, not only the diesel engine and the exhaust gas purifying device are disposed in a limited mounting space but also an air cleaner. Various parts such as radiators, oil coolers, etc. must be packed. For example, a speed sprayer has to have a compact body (especially a vehicle height) in order to prevent contact with trees and fruits in an orchard, and has extremely limited mounting space.

  However, in the work vehicle mounting space (engine room), not only the diesel engine being driven, but also the exhaust gas purification device becomes very hot. For this reason, it is important to adjust the temperature in the engine room so that various parts in the engine room are not affected by the exhaust heat of the diesel engine or exhaust gas purification device. It is necessary to consider.

  The present invention has been made as a technical problem to provide a work vehicle which has been improved by examining the above-described present situation.

  The invention of claim 1 includes an engine mounted on a traveling machine body and an exhaust gas purification device that purifies exhaust gas of the engine, and the engine is powered by a flywheel in a flywheel housing. In a work vehicle provided with a power take-out portion for taking out the engine, the power take-out portion is positioned on the rear side of the traveling machine body, the exhaust gas purifying device is disposed above the power take-out portion, and the left and right sides of the engine On the other hand, an air cleaner that cleans the air introduced into the engine is disposed, and a first heat shield plate that blocks heat from the exhaust gas purification device between the exhaust gas purification device and the air cleaner. Is arranged.

  According to a second aspect of the present invention, in the work vehicle according to the first aspect, a radiator for cooling engine cooling water is disposed on the left and right sides of the engine, and on the left and right outer sides of the radiator, the radiator after passing the radiator is disposed. A wind exhaust fan that exhausts air to the outside is disposed, and a second heat shield plate that blocks heat from the exhaust gas purification device is disposed between the exhaust gas purification device and the power take-out unit. It is that.

  According to a third aspect of the present invention, in the work vehicle according to the first or second aspect, a tail pipe extends downward from a portion of the exhaust gas purifying device near the air cleaner, and an outer peripheral side of the tail pipe is the tail pipe. It is surrounded by a heat shield cylinder that blocks heat from the pipe.

  According to the present invention, the engine includes an engine mounted on a traveling machine body and an exhaust gas purification device that purifies the exhaust gas of the engine, and the engine has a power take-out portion that extracts the power of the engine via a flywheel housing. In the work vehicle provided, the power take-out part is positioned on the rear side of the traveling machine body, the exhaust gas purification device is disposed above the power take-out part, and the engine An air cleaner that cleans the air to be introduced is disposed, and a first heat shield plate that blocks heat from the exhaust gas purification device is disposed between the exhaust gas purification device and the air cleaner. Even if the exhaust gas purifying device and the air cleaner are arranged adjacent to each other, the ambient temperature around the air cleaner is insulated by the heat insulating action of the first heat shield plate. Rise can easily be suppressed, thereby reducing the possibility of capturing the air cleaner has been warmed by the engine and the exhaust gas purifying device hot.

  According to invention of Claim 2, the radiator which cools engine cooling water is arrange | positioned in the right-and-left other side of the said engine, and the exhaust fan which discharges the air after passing the said radiator outside on the right-and-left outer side of the said radiator And a second heat shield plate that blocks heat from the exhaust gas purification device is disposed between the exhaust gas purification device and the power take-out unit. Even if the power take-out portion is disposed adjacent to the power take-out portion, an increase in the ambient temperature around the power take-out portion can be easily suppressed by the heat insulating action of the second heat shield plate. By driving the exhaust fan, air around the exhaust gas purification device (hot air) is discharged from the inner space of the heat shield plates to the outside, and the periphery of the exhaust gas purification devices (of the heat shield plates). The inner space can be ventilated smoothly.

  According to the invention of claim 3, the tail pipe extends downward from a portion near the air cleaner in the exhaust gas purifying device, and the outer peripheral side of the tail pipe is a heat shield cylinder that blocks heat from the tail pipe. Therefore, it is possible to suppress the heat from the tail pipe from reaching the air cleaner by the heat insulating action of the heat shield cylinder and to further reduce the possibility that the air cleaner takes in hot air.

It is a left view of the speed sprayer in an embodiment. It is a top view of a speed sprayer. It is a top view inside a cabin. It is a schematic plan view of a steering system. It is a power transmission system diagram of a speed sprayer. It is a schematic explanatory drawing of an engine and a pressure accumulation type fuel injection device. It is a top view in an engine room. It is a left view in an engine room. It is a left view in the engine room which abbreviate | omitted the radiator. It is a rear view in an engine room. It is a rear view in the engine room which omitted the portal frame. It is an expansion perspective view explaining the attachment structure of a heat shield board. It is an expansion perspective view explaining the attachment structure of a heat insulation cylinder.

  Hereinafter, an embodiment embodying the present invention will be described with reference to the drawings when applied to a speed sprayer as a work vehicle.

  First, the outline of the speed sprayer will be described with reference to FIGS. The traveling machine body 1 of the speed sprayer 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. A cabin 5 is arranged in the front part of the traveling machine body 1. A chemical solution tank 6 for storing a chemical solution is disposed behind the cabin 5 in the traveling machine body 1 (a front and rear halfway part of the traveling machine body 1). An engine room 7 is arranged behind the chemical tank 6 in the traveling machine body 1. A diesel engine 8 (hereinafter simply referred to as an engine) and a power spray pump 9 are mounted in the engine room 7. A PTO transmission case 20 for transmitting power from the engine 8 to the power spray pump 9 and the like is attached to the rear portion of the engine 8. A chemical solution spraying part 10 and a blower fan 11 are arranged at the rear part of the traveling machine body 1 (behind the engine room 7). A traveling mission case 12 for shifting the power from the engine 8 is mounted below the chemical tank 6. The power spray pump 9 and the blower fan 11 are driven by the power of the engine 8, the chemical liquid is sucked from the chemical liquid tank 6 by the power spray pump 9, and the chemical liquid is sprayed from the chemical liquid spraying unit 10. The sprayed chemical liquid is diffused in a field such as an orchard by the air blown from the blower fan 11 and is sprayed on the fruit tree or the like.

  A front axle case 13 is provided at the front lower part of the substantially frame-shaped body frame 2 constituting the traveling body 1. Front wheels 3 are rotatably attached to the left and right sides of the front axle case 13. A rear axle case 14 is provided at the rear lower part of the body frame 2. The rear wheels 4 are rotatably attached to the left and right sides of the rear axle case 14. The traveling mission case 12 is connected to the front axle case 13 via a front wheel transmission shaft 15 extending forward and capable of transmitting power, and is connected to the rear axle case 14 via a rear wheel transmission shaft 16 extending rearward. doing. Power from the engine 8 via the PTO transmission case 20 is changed in the traveling transmission case 12, and the left and right front wheels 3 are driven via the front wheel transmission shaft 15 and the front axle case 13 by the transmission output, and the rear wheel transmission shaft 16 and The left and right rear wheels 4 are configured to be driven via the rear axle case 14 (configured to be capable of four-wheel drive).

  As shown in FIGS. 2 and 3, a control seat 21 on which an operator is seated and a control handle 22 for steering the left and right front wheels 3 or the front and rear four wheels 3 and 4 are arranged inside the cabin 5. . An instrument panel 24 for displaying an engine tachometer, a fuel gauge, and the like is disposed on the upper rear side of the dashboard 23 disposed in front of the steering handle 22. On the rear right side of the dashboard 23, a two-wheel steering mode switch 25 and a four-wheel steering mode switch 26 for switching the left and right front wheels 3 and the left and right rear wheels 4 between a two-wheel steering mode and a four-wheel steering mode, and an engine speed And a throttle lever 29 for setting and holding the. Each mode switch 25, 26 is a switch with a lamp. In the following description, for convenience, the two-wheel steering mode is referred to as a 2WS mode, and the four-wheel steering mode is referred to as a 4WS mode.

  Below the dashboard 23, an accelerator pedal 30 that increases and decreases the engine speed based on the set rotational speed of the throttle lever 29, a brake pedal 31 that brakes the traveling machine body 1, and traveling for power interruption A clutch pedal 32 for disengaging the clutch 84 (see FIG. 5) is disposed. A side column 33 provided on the left side of the control seat 21 switches between a parking brake lever 34 for maintaining the left and right rear wheels 4 in a braking state, and a driving method for the front wheels 3 and the rear wheels 4 between two-wheel drive and four-wheel drive. A drive switching lever 35 to be operated, a main transmission lever 36 for operating forward, stop, reverse, and vehicle speed of the traveling machine body 1 and a sub-transmission operating tool as an auxiliary transmission operating tool for switching the output of the traveling mission case 12 between low speed and high speed. A shift lever 37 is disposed.

  As shown in FIGS. 2 and 4, the front axle case 13 is provided with a front wheel steering cylinder 41 for changing the direction of the left and right front wheels 3. Regardless of whether the 2WS mode or the 4WS mode is executed, the front wheel steering cylinder 41 is expanded and contracted according to the turning operation of the steering handle 22, so that the left and right front wheels 3 are connected to the kingpin 44 via the tie rod 42 and the knuckle arm 43. Change direction (turn) in the same direction around. That is, the steering angle (steering angle) of the left and right front wheels 3 is changed in proportion to the steering angle (rotation operation amount) of the steering handle 22.

  The rear axle case 14 is provided with a rear wheel steering cylinder 45 for changing the direction of the left and right rear wheels 4. When executing the 4WS mode, the left and right rear wheels 4 are moved around the kingpin 48 through the tie rod 46 and the knuckle arm 47 by extending and retracting the rear wheel steering cylinder 45 according to the turning operation of the steering handle 22. Change direction (turn). That is, the steering angle (steering angle) of the left and right rear wheels 4 is changed in proportion to the steering angle (rotation operation amount) of the steering handle 22. In this case, the steering angles of the left and right rear wheels 4 are opposite in phase to the steering angles of the left and right front wheels 3.

  Next, the power transmission system of the speed sprayer will be described mainly with reference to FIG. A flywheel housing 71 is fixed to the rear surface side of the cylinder block 50 (see FIGS. 8 and 10 to 12). A flywheel 72 is disposed in the flywheel housing 71. A flywheel 72 is directly connected to the rear end side of the engine output shaft 70 protruding forward and backward from the engine 8. The power of the engine 8 is taken out through the flywheel 72. The PTO mission case 20 is detachably attached to the rear side of the flywheel housing 71. A flywheel 72 is connected to a mission input shaft 73 in the PTO mission case 20. The PTO mission case 20 of the embodiment protrudes from the engine 8 downward to the right. From the overhanging portion of the PTO mission case 20, a main shaft 74 that transmits power to the traveling mission case 12 and a pump PTO shaft 75 that drives the power spray pump 9 protrude forward. Further, from the PTO mission case 20, a fan PTO shaft 76 that drives the blower fan 11 protrudes backward. The PTO mission case 20 constitutes a power take-out unit that takes out the power of the engine 8 via the flywheel 72.

  In the PTO mission case 20, the transmission input shaft 73, the main transmission gear mechanism 77 that transmits the power transmitted to the mission input shaft 73 to the main driving shaft 74 and the pump PTO shaft 75, and the transmission input shaft 73 are transmitted. A sub-transmission gear mechanism 78 that transmits the power to the fan PTO shaft 76 via the fan clutch mechanism 79 is disposed. The power from the engine 8 is branched and transmitted to a system from the mission input shaft 73 to the main transmission gear mechanism 77 and a system from the mission input shaft 73 to the sub-transmission gear mechanism 78. The power transmitted to the main transmission gear mechanism 77 is further branched and transmitted to a system directed to the main drive shaft 74 and a system directed to the pump PTO shaft 75. The power transmitted from the main transmission gear mechanism 77 to the pump PTO shaft 75 is transmitted to the pump shaft (not shown) of the power spray pump 9 via the pulley and belt transmission system 80 to drive the power spray pump 9. The sub-transmission gear mechanism 78 can be switched between two stages of high speed and low speed. The power transmitted from the mission input shaft 73 to the sub-transmission gear mechanism 78 via the fan clutch mechanism 79 is appropriately shifted by the sub-transmission gear mechanism 78 and then transmitted to the fan PTO shaft 76 to drive the blower fan 11.

  The traveling mission case 12 located in front of the engine 8 and below the chemical tank 6 has a main transmission input shaft 82 that receives power from the main driving shaft 74 via a transmission shaft 81 having universal shaft joints at both ends, A stirring PTO shaft 83 for driving a stirring blade (not shown) and a traveling output shaft 17 for transmitting power to the front wheel transmission shaft 15 and the rear wheel transmission shaft 16 are provided. The main transmission input shaft 82 projects rearward from the traveling mission case 12, and the main driving shaft 74 projecting forward from the overhanging portion of the PTO mission case 20 transmits power to the main transmission input shaft 82 via the transmission shaft 81. The stirring PTO shaft 83 protrudes forward from the traveling mission case 12. The travel output shaft 17 protrudes from both front and rear sides of the travel mission case 12. A front wheel transmission shaft 15 is connected to the front end side of the travel output shaft 17 via a universal shaft joint, and a rear wheel transmission shaft 16 is connected to the rear end side of the travel output shaft 17 via a universal shaft joint.

  In the traveling mission case 12, a power transmission traveling clutch 84, and a main transmission transmission shaft 85 connected to the front end side of the main transmission input shaft 82 (part in the traveling mission case 12) via the traveling clutch 84. The main transmission gear mechanism 86 and the auxiliary transmission gear mechanism 87 for shifting the power via the PTO mission case 20, the agitating PTO shaft 83 and the traveling output shaft 17 are arranged. The power transmitted from the main transmission input shaft 82 to the main transmission transmission shaft 85 via the travel clutch 84 is branched and transmitted to a system toward the stirring PTO shaft 83 and a system toward the main transmission gear mechanism 86. The power transmitted from the main transmission transmission shaft 85 to the stirring PTO shaft 83 is transmitted to the stirring shaft (not shown) of the stirring blade in the chemical liquid tank 6 via the pulley and the belt transmission system 88 to drive the stirring blade. . The power directed from the main transmission transmission shaft 85 to the main transmission gear mechanism 86 is appropriately shifted by the main transmission gear mechanism 86 and the auxiliary transmission gear mechanism 87 and then transmitted to the travel output shaft 17. Then, the transmission power transmitted to the travel output shaft 17 is transmitted to the front wheel differential gear mechanism 18 in the front axle case 13 via the front wheel transmission shaft 15 to drive the left and right front wheels 3 and the rear wheel transmission shaft 16. To the rear wheel differential gear mechanism 19 in the rear axle case 14 to drive both the left and right rear wheels 4.

  Next, the engine 8 and its peripheral structure will be described with reference to FIGS. The engine 8 mounted on the traveling machine body 1 includes a cylinder block 50 with a cylinder head 51 fastened on the upper surface. An exhaust manifold 52 is provided on one side surface of the cylinder head 51. The exhaust pipe 53 connected to the exhaust port side of the exhaust manifold 52 is connected to a diesel particulate filter 54 (hereinafter referred to as a collection filter) which is a post-processing device. The collection filter 54 collects particulate matter (PM) and the like in the exhaust gas. Although not shown, the collection filter 54 of the embodiment has a structure in which an oxidation catalyst such as platinum and a honeycomb structure are arranged in series in a substantially cylindrical filter case in a casing made of a heat-resistant metal material. It has become. Exhaust gas discharged from each cylinder of the engine 8 to the exhaust manifold 52 is purified through the collection filter 54 and then released to the outside of the machine.

  As shown in FIG. 6 and the like, the engine 8 is provided with a pressure accumulation type fuel injection device 55 (common rail type fuel injection device) as fuel supply means. The accumulator fuel injector 55 includes a plurality of injectors 56 (fuel injection valves) that inject high-pressure fuel into each cylinder of the engine 8, a common rail 57 (accumulation chamber) that accumulates high-pressure fuel and distributes the fuel to each injector 56, A supply pump 60 that pressurizes the fuel sucked from the fuel tank 58 mounted on the traveling machine body 1 through the fuel filter 59 to a high pressure and feeds the fuel to the common rail 57 is provided.

  Each injector 56 is connected to a common rail 57 via an individual high-pressure pipe 61. While each injector 56 is opening and operating, high-pressure fuel pumped from the common rail 57 is configured to be injected toward the combustion chamber of each cylinder. A pressure sensor 62 that detects internal pressure (fuel pressure in the common rail 57) is attached to the common rail 57. The supply pump 60 is driven by the power of the engine 8 and has a pressure control electromagnetic valve 63 that adjusts the amount of fuel pumped to the common rail 57. The pressure control solenoid valve 63 controls the common rail internal pressure by adjusting the fuel pumping amount to the common rail 57 by increasing or decreasing the fuel return amount from the supply pump 60 to the fuel tank 58. The fuel injection pressure of each injector 56 is substantially equal to the common rail internal pressure. For this reason, the injection pressure of each injector 56 is indirectly controlled by the control of the common rail internal pressure by the pressure control electromagnetic valve 63.

  Each injector 56, common rail 57 and supply pump 60 are connected to a fuel tank 58 via a return pipe 64. A pressure limiter valve 65 is provided between the common rail 57 and the return pipe 64 to prevent the common rail internal pressure from increasing more than necessary. A pressure control electromagnetic valve 63 is provided between the supply pump 60 and the return pipe 64. Excess fuel in each injector 56, common rail 57 and supply pump 60 is returned to the fuel tank 58 through a return pipe 64.

  The accumulator fuel injection device 55 performs main injection near the top dead center (TDC). In addition to the main injection, the accumulator type fuel injection device 55 performs a small amount of pilot injection for the purpose of reducing NOx and noise at a time approximately 60 ° before the top dead center, or for the purpose of reducing noise. Pre-injection is performed at a time immediately before top dead center, or after injection and post-injection for the purpose of reducing particulate matter and promoting exhaust gas purification are performed at a time after top dead center.

  As shown in FIGS. 7 to 11, the bonnet 91 forming the engine room 7 has a substantially arc shape for the purpose of preventing the bonnet from being caught by the branch at the time of farming work under the branch as much as possible. The bonnet 91 of the embodiment is divided into left and right parts, and both the left and right bonnets 91 can be turned up and turned around the center of the left and right. That is, the left and right bonnets 91 are so-called gull-wing doors. An air discharge port 92 is formed in one of the left and right bonnets 91 (the left bonnet 91 in the embodiment). A dustproof net 93 is attached to the air discharge port 92 (see FIGS. 1, 7 and 8).

  As shown in FIGS. 8 to 11, at the rear part of the body frame 2, left and right front support bases 94 that support the front side of the engine 8 and left and right rear support bases 95 that support the rear side of the engine 8 are provided. Provided. The front portion of the engine 8 is connected to the upper surface side of each front support base 94 via a front leg body 96 having vibration-proof rubber. An upper surface of each rear support 95 is connected to a PTO mission case 20 attached to the rear part of the engine 8 via a rear leg body 97 having vibration-proof rubber. That is, the engine 8 and the PTO transmission case 20 are supported in an anti-vibration manner at the rear of the body frame 2 via the four front and rear support bases 94 and 95. A support plate base 98 is provided on the rear right side of the machine body frame 2. The power spray pump 9 is mounted on the support plate base 98.

  In the engine 8 of the embodiment, the direction in which the engine output shaft 70 extends is set in parallel with the front-rear direction of the traveling machine body 1 (the engine output shaft 70 is set in the front-rear direction). The PTO transmission case 20 that is a power take-out part is positioned on the rear side of the engine room 7 (the traveling machine body 1). The exhaust manifold 52 is located on the left side surface of the cylinder head 51. An intake manifold (not shown) is provided on the right side surface of the cylinder head 51. As shown in FIGS. 7 to 11, a filter mounting portion 100 is formed on the upper surface of the flywheel housing 71. A collection filter 54 is attached to the filter attachment portion 100 via a bracket leg 99. The collection filter 54 is supported on the upper side of the flywheel housing 71 which is a highly rigid part. A PTO mission case 20 attached to the rear side of the flywheel housing 71 is located below the collection filter 54. That is, the collection filter 54 is positioned above the PTO mission case 20 while being supported on the upper side of the flywheel housing 71. Needless to say, the collection filter 54 is located on the rear side of the engine room 7 (the traveling machine body 1) similarly to the PTO mission case 20.

  The collection filter 54 extends in the left-right direction intersecting with the engine output shaft 70 direction (front-rear direction) (the longitudinal direction of the collection filter 54 intersects with the engine output shaft 70 direction). The exhaust inlet side (left side) of the collection filter 54 is connected to the exhaust outlet side of the exhaust manifold 52 via the exhaust pipe 53. A tail pipe 101 extending downward is connected to the exhaust outlet side (right side) of the collection filter 54. The exhaust gas of the engine 8 is purified from the exhaust manifold 51 via the collection filter 54 and then moves to the tail pipe 101 and is discharged from the exhaust port of the tail pipe 101 to the outside of the machine. Particulate matter (PM) in the exhaust gas discharged outside the machine via the tail pipe 101 is removed by the collection filter 54 disposed in the exhaust path of the engine 8, and carbon monoxide (CO in the exhaust gas) ) And hydrocarbons (HC). As described above, since the PTO mission case 20 protrudes from the engine 8 downward to the right, the middle portion of the tail pipe 101 is curved outwardly to the left and right to bypass the extension portion of the PTO mission case 20.

  According to the above configuration, the flywheel housing 71 that is a high-rigidity part of the engine 8 can be used to support the collection filter 54 that is a heavy object with high rigidity and stability, and damage to the collection filter 54 due to vibration or the like can be prevented. Can be prevented. The space above the PTO mission case 20, which is a dead space, can be effectively used as an arrangement space for the collection filter 54, and the PTO mission case 20 and the collection filter 54 can be made compact together with the engine 8 in the engine room 7 in which the engine 8 is arranged. Can be accommodated. The collection filter 54 belongs to the same vibration system as that of the engine 8, so that it is possible to simplify the anti-vibration measures and reduce the cost.

  A radiator 102 for cooling the engine coolant is disposed in the engine room 7 on one side of the engine 8 on the left and right sides (left side in the embodiment). In this case, a radiator mounting base 103 is provided separately from the left front support base 94 at the rear left side of the body frame 2 and in front of the left front support base 94 (see FIGS. 7 and 8). The radiator 102 is bolted to the rectangular frame-shaped mounting frame frame 104. By connecting the lower end side of the mounting frame 104 across the radiator mounting base 103 and the left rear support base 95 with the wide left and right wide surfaces of the radiator 102 facing the left side of the engine 8, the radiator 102 is connected. It is located on the left side of the engine 8.

  The radiator 102 is set to a size that covers the engine 8 and a part of the collection filter 54 in a side view. The radiator 102 of the embodiment has a size that occupies a wide range of the left bonnet 91 in a side view, and the longitudinal length of the radiator 102 is slightly shorter than the longitudinal length of the left bonnet 91 (see FIG. 8). Therefore, in the engine room 7, the radiator 102 and the collection filter 54 surround the left side and the rear side of the engine 8 near the center in plan view. For this reason, although the collection filter 54 and the radiator 102 are compactly arranged around the engine 8 (the left side and the rear side), the radiator 102 can be enlarged without being obstructed by the collection filter 54, and the radiator The cooling performance of 102 is improved. As a result, the heat balance in the engine room 7 can be maintained satisfactorily.

  On the left and right outer sides of the radiator 102, an exhaust fan 105 that discharges air after passing through the radiator 102 (air in the engine room 7) to the outside is disposed. In the embodiment, a front and rear longitudinal transmission pipe 106 that supports a power relay shaft and an exhaust fan shaft (not shown) so as to be able to transmit power is attached to the attachment frame frame 104. Although details are omitted, the power relay shaft extends along the longitudinal direction of the transmission pipe 106, and the exhaust fan shaft extends in a direction orthogonal to the power relay shaft. An exhaust fan shaft is linked to the front end side of the power relay shaft via a bevel gear mechanism. The base end side of the power relay shaft is connected to the front end side of the engine output shaft 70 through a pulley and a belt transmission system so that power can be transmitted. The power of the engine 8 is transmitted to the exhaust fan shaft from the front end side of the engine output shaft 70 through the pulley and belt transmission system and the power relay shaft in the transmission pipe 106 to drive the exhaust fan 105 to rotate.

  The radiator 102 and the exhaust fan 105 face the air outlet 92 of the left bonnet 91. An exhaust fan 105 is located between the air outlet 92 of the left bonnet 91 and the radiator 102. An oil cooler 107 for cooling the hydraulic oil and a condenser 108 for liquefying a refrigerant for an air conditioner (not shown) for managing the air conditioning in the cabin 5 are arranged on the left and right inner sides of the radiator 102. The oil cooler 107 and the condenser 108 are positioned side by side in the front-rear direction, and both are attached to the attachment frame frame 104. By the rotational drive of the exhaust fan 105, the air in the engine room 7 is discharged from the air discharge port 92 through the oil cooler 107, the condenser 108 and the radiator 102 to the outside of the machine. As a result, the engine 8, the oil cooler 107, the condenser 108, and the radiator 102 are air-cooled.

  As shown in FIGS. 7, 10, and 11, an air cleaner 109 that cleans the air introduced into the engine 8 is disposed in the engine room 7 on the left and right other sides (right side in the embodiment) of the engine 8. ing. In the embodiment, a portal frame 110, which has a substantially portal shape and has a size that can be accommodated in the engine room 7 when viewed from the advancing direction, is erected on the rear side of the engine 8 in the body frame 2. The pair of legs of the portal frame 110 are bolted to the corresponding left and right rear support bases 95, respectively. An air cleaner 109 is attached to the front right corner of the portal frame 110. The air cleaner 109 is located side by side with the collection filter 54 on the rear side in the engine room 7. A power spray pump 9 is located in front of the air cleaner 109. An intake pipe 111 extending from the air cleaner 109 is connected to an intake manifold (not shown) of the engine 8.

  With this configuration, the air cleaner 109 may take in the hot air warmed by the engine 8 or the collection filter 54 while the collection filter 54, the radiator 102, and the air cleaner 109 are compactly arranged around the engine 8. Can be reduced. In particular, by driving the exhaust fan 105, the air around the collection filter 54 (hot air) is discharged outside the apparatus, and the vicinity of the collection filter 54 can be smoothly ventilated, so that the air cleaner 109 may further take in hot air. Can be reduced.

  As shown in FIGS. 7 and 9 to 11, the sensor bracket 125 is bolted to the rear surface side of the cylinder head 51 in the engine 8. On the upper surface side of the sensor bracket 125, a differential pressure sensor 126 and a harness connector 127a for a temperature sensor (not shown) are attached. The differential pressure sensor 126 detects a difference (exhaust gas differential pressure) between the exhaust gas pressure on the inflow side and the exhaust gas pressure on the outflow side of the honeycomb structure. One end side of the upstream sensor pipe 126a and the downstream sensor pipe 126b is connected to the differential pressure sensor 126, respectively. The other end sides of the sensor pipe bodies 126a and 126b are inserted into the collection filter 54 and fixed so as to sandwich the honeycomb structure (soot filter) in the collection filter 54. The temperature sensor harness connector 127a is connected to a temperature sensor fixed by being inserted into the collection filter 54 via the sensor harness 127b. The differential pressure sensor 126 and the temperature sensor harness connector 127a are supported on the engine 8 side, not the collection filter 54 side, via the sensor bracket 125 so as not to interfere with the inner surface side of the bonnet 91. In the embodiment, the height positions of the upper ends of the differential pressure sensor 126 and the temperature sensor harness connector 127 a are set lower than the upper ends of the radiator 102 and the intake pipe 111.

  As shown in FIGS. 7 and 10 to 13, a horizontal heat shield plate 112 as a first heat shield plate that blocks heat from the collection filter 54 between the collection filter 54 and the air cleaner 109. Is arranged. The horizontal heat shield plate 112 has a substantially rectangular shape, and the arrangement space of the collection filter 54 and the arrangement space of the air cleaner 109 are partitioned by the horizontal heat shield plate 112 in plan view. In the embodiment, the bracket plate 113 is attached to the lower side of the right corner portion of the portal frame 110. A horizontal heat shield plate 112 is attached to the left end side of the bracket plate 113 so as to protrude forward. For this reason, even if the collection filter 54 and the air cleaner 109 are disposed adjacent to each other, an increase in the ambient temperature around the air cleaner 109 can be easily suppressed by the heat insulating action of the lateral heat shield plate 112, and the air cleaner 109 The possibility of taking in hot air warmed by the collecting filter 54 can be reduced.

  As shown in FIGS. 10 to 12, a lower heat shield plate 114 as a second heat shield plate that blocks heat from the collection filter 54 is provided between the collection filter 54 and the PTO mission case 20. It is arranged. The lower heat shield plate 114 has a horizontally long rectangular shape, and the arrangement space of the collection filter 54 and the arrangement space of the PTO mission case 20 are partitioned by the lower heat shield plate 114 in the rear view. In the embodiment, a pair of front and rear plate plates 118 are bolted to the upper surface side of the PTO mission case 20. The lower heat shield plates 114 are placed on the front and rear plate plates 118 from above, and the lower heat shield plates 114 are attached to the front and rear plate plates 118. The right and lower sides of the collection filter 54 are surrounded by both heat shield plates 112 and 114. In other words, the collection filter 54 is disposed in the inner space of the heat shield plates 112 and 114. The inner space of both heat shield plates 112 and 114 is open toward the exhaust fan 105 side (right side).

  According to said structure, even if the collection filter 54 and PTO mission case 20 are arrange | positioned adjacently, the raise of the atmospheric temperature around PTO mission case 20 can be easily suppressed by the heat insulation effect | action of the lower thermal-insulation board 114. FIG. By driving the exhaust fan 105, the air (hot air) around the collection filter 54 is exhausted from the inner space of the heat shield plates 112, 114 to the outside, and the periphery of the collection filter 54 (both heat shield plates 112, 114). 114 inner space) can be smoothly ventilated.

  As shown in FIGS. 10 and 11, the oil cooler 107 on the left and right inner sides of the radiator 102 is connected to the back side of the PTO mission case 20 via a hydraulic pipe 115. The hydraulic pipe 115 passes through the lower side of the lower heat shield plate 114. On the left side of the PTO mission case 20, a fan clutch motor 116 for disengaging the fan clutch mechanism 79 (see FIG. 5) in the PTO mission case 20 is disposed. Accordingly, the fan clutch motor 116 is also located below the lower heat shield plate 114. The heat insulating action of the lower heat shield plate 114 can suppress the heat from the collecting filter 54 from reaching the hydraulic pipe 115 (and thus the internal hydraulic oil) and the fan clutch motor 116. A controller 117 that controls the operation of the speed sprayer is disposed on the left leg of the portal frame 110. The controller 117 is disposed behind the radiator 102 and is away from the engine 8 and the collection filter 54. For this reason, the influence of the heat from the collection filter 54 or the like hardly reaches the controller 117, and contributes to the stabilization of the control and long life of the controller 117.

  As shown in FIGS. 10 and 13, the outer peripheral side of the tail pipe 101 is surrounded by a heat shield cylinder 120 that blocks heat from the tail pipe 101. In the embodiment, the tail pipe 101 is separated into an upstream pipe body 101a and a downstream pipe body 101b. An exhaust inlet side of the upstream pipe body 101 a is connected to an exhaust outlet side (right side) of the collection filter 54. An exhaust inlet side of the downstream pipe body 101b is connected to an exhaust outlet side of the upstream pipe body 101a via a bellows-like connecting pipe 101c which is a flexible pipe. The upper side of the downstream pipe body 101b is attached to the right rear support base 95 via a pipe bracket (not shown). The vibration transmitted from the engine 8 to the collection filter 54 and the upstream pipe body 101a is blocked by the bellows-like connection pipe 101c and is not transmitted to the downstream pipe body 101b. Vibration caused by driving of the engine 8 is absorbed by the bellows-like connecting pipe 101c.

  As shown in FIG. 13, the front side of the upstream pipe body 101a and the bellows-like connecting pipe 101c is covered with a substantially L-shaped upper front cover body 121. The upper front cover body 121 is connected to the lower end side of the bracket plate 113 attached to the portal frame 110 and the lower end side of the horizontal heat shield plate body 112. The rear surface side of the upstream pipe body 101a is covered with an upper rear cover body 122. The upper rear cover body 122 is directly bolted to the upstream pipe body 101a. The outer peripheral side of the bellows-like connecting pipe 101 c is covered with a cylindrical heat insulating cover body 123. The upper rear side of the downstream pipe body 101b is covered with a lower rear cover body 124 attached to the right rear support base 95. The upper front cover body 121, the upper rear cover body 122, the heat insulating cover body 123, and the lower rear cover body 124 constitute the heat shield cylinder 120.

  According to the above configuration, heat from the tail pipe 101 can be prevented from reaching the air cleaner 109 due to the heat insulating action of the heat shield cylinder 120 (particularly the upper front cover body 121), and the risk of the air cleaner 109 taking in hot air is further reduced. it can.

  As is clear from the above description and FIGS. 10 and 11, the engine 8 mounted on the traveling machine body 1 and an exhaust gas purification device 54 that purifies the exhaust gas of the engine 8 are provided. In a work vehicle provided with a power take-out unit 20 for taking out the power of the engine 8 via a flywheel 72 in the wheel housing 71, the exhaust gas purification device 54 is supported on the upper side of the flywheel housing 71, Since the exhaust gas purification device 54 is positioned above the power take-out unit 20, the exhaust gas purification device 54, which is a heavy object, is used by using the flywheel housing 71 that is a highly rigid part of the engine 8. It can be supported with high rigidity and stability, and the exhaust gas purification device 54 can be prevented from being damaged due to vibration or the like. A space above the power take-out unit 20 that is a dead space can be effectively used as a placement space for the exhaust gas purification device 54, and the power take-out unit 20 and the engine 8 together with the engine 8 are placed in the engine room 7 in which the engine 8 is placed. The exhaust gas purification device 54 can be accommodated in a compact manner. Since the exhaust gas purifying device 54 belongs to the same vibration system as the engine 8, it is possible to simplify the anti-vibration measures and reduce the cost.

  Further, the power take-out unit 20 and the exhaust gas purification device 54 are positioned on the rear side of the traveling machine body 1, and a radiator 102 for cooling engine cooling water is disposed on one side of the left and right sides of the engine 8, Since the radiator 102 is set to a size that covers the engine 8 and a part of the exhaust gas purification device 54 in a side view, the exhaust gas purification device 54 and the radiator 102 are placed around the engine 8. The radiator 102 can be increased in size without being obstructed by the exhaust gas purification device 54 while being arranged in a compact manner, and the cooling performance of the radiator 102 is improved. As a result, the heat balance in the engine room 7 can be favorably maintained.

  Further, an exhaust fan 105 for discharging the air after passing through the radiator 102 to the outside is disposed on the left and right outer sides of the radiator 102, and air to be introduced into the engine 8 is disposed on the other left and right sides of the engine 8. Since the air cleaner 109 to be cleaned is disposed, the exhaust gas purifying device 54, the radiator 102, and the air cleaner 109 are compactly disposed around the engine 8. Further, it is possible to reduce the risk of taking in hot air warmed by the exhaust gas purification device 54.

  As is clear from the above description and FIG. 7 and FIGS. 10 to 12, the engine 8 includes the engine 8 mounted on the traveling machine body 1, and the exhaust gas purification device 54 that purifies the exhaust gas of the engine 8. In a work vehicle provided with a power take-out part 20 for taking out the power of the engine 8 via a flywheel housing 72, the power take-out part 20 is positioned on the rear side of the traveling machine body 1, and the exhaust gas purification device 54 is disposed above the power take-out unit 20, and an air cleaner 109 for cleaning air introduced into the engine 8 is disposed on one side of the left and right sides of the engine 8, and the exhaust gas purification device 54 and the air cleaner are disposed. 109 is disposed with a lateral heat shield plate 112 that cuts off heat from the exhaust gas purification device 54, and therefore the exhaust gas purification device 54. Even if the air cleaner 109 is disposed adjacent to the air cleaner 109, the heat insulating action of the lateral heat shield plate 112 can easily suppress an increase in the ambient temperature around the air cleaner 109, and the air cleaner 109 can control the engine 8 and the exhaust gas purification. The possibility of taking in hot air warmed by the device 54 can be reduced.

  A radiator 102 for cooling the engine coolant is disposed on the left and right sides of the engine 8, and an exhaust fan 105 for discharging the air after passing through the radiator 102 to the outside is disposed on the left and right outside of the radiator 102. Since a lower heat shield plate 114 that blocks heat from the exhaust gas purification device 54 is disposed between the exhaust gas purification device 54 and the power take-out unit 20, the exhaust gas purification device Even if the device 54 and the power take-out unit 20 are disposed adjacent to each other, an increase in the ambient temperature around the power take-out unit 20 can be easily suppressed by the heat insulating action of the lower heat shield plate 114. By driving the exhaust fan 105, air (hot air) around the exhaust gas purification device 54 is discharged from the inner space of the heat shield plates 112 and 114 to the outside, and the periphery of the exhaust gas purification device 54 (the above-mentioned The inside space of the heat shield plates 112 and 114 can be smoothly ventilated.

  Further, the tail pipe 101 extends downward from a portion of the exhaust gas purification device 54 near the air cleaner 109, and the outer peripheral side of the tail pipe 101 is a heat shield cylinder 120 that blocks heat from the tail pipe 101. Therefore, it is possible to suppress the heat from the tail pipe 101 from reaching the air cleaner 109 by the heat insulating action of the heat shield cylinder 120, and to further reduce the possibility that the air cleaner 109 takes in hot air.

  The present invention is not limited to the above-described embodiment, and can be embodied in various forms. The configuration of each other part is not limited to the illustrated embodiment, and various modifications can be made without departing from the spirit of the present invention.

1 traveling machine body 2 machine body frame 3 front wheel 4 rear wheel 8 engine 20 PTO transmission case 54 diesel particulate filter 70 engine output shaft 71 flywheel housing 72 flywheel 91 bonnet 101 tail pipe 102 radiator 105 exhaust fan 109 air cleaner 112 side shield Heat plate 114 Lower heat shield plate 120 Heat shield cylinder

Claims (3)

An engine mounted on a traveling machine body and an exhaust gas purification device for purifying exhaust gas of the engine are provided, and the engine is provided with a power take-out portion for taking out the power of the engine via a flywheel in a flywheel housing Working vehicle
The power take-out part is positioned on the rear side of the traveling machine body, the exhaust gas purification device is disposed above the power take-out part, and the air introduced into the engine is purified on one side of the left and right sides of the engine. An air cleaner is disposed, and a first heat shield plate that blocks heat from the exhaust gas purification device is disposed between the exhaust gas purification device and the air cleaner.
Work vehicle. A radiator for cooling engine cooling water is disposed on the left and right sides of the engine, and an exhaust fan for discharging the air that has passed through the radiator to the outside is disposed on the left and right outside of the radiator. Between the device and the power take-out portion, a second heat shield plate that blocks heat from the exhaust gas purification device is disposed,
The work vehicle according to claim 1. A tail pipe extends downward from a portion near the air cleaner in the exhaust gas purification device, and the outer peripheral side of the tail pipe is surrounded by a heat shield cylinder that blocks heat from the tail pipe.
The work vehicle according to claim 1 or 2.

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