JP2015085861A - Work vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a work vehicle that can transfer hot air exhaled from an exhaust gas purifier to a hot air storage space.SOLUTION: The work vehicle is configured to exhaust an exhaust gas to the outside of an engine room from an engine arranged in the engine room through an exhaust pipe having an exhaust gas purifier provided in the middle part thereof. The exhaust gas purifier is arranged at a front part in the engine room, while a hot air storage space is arranged at a rear upper part in the engine room. Between the exhaust gas purifier and the hot air storage space, a hot air transfer path is formed, and in the engine room, hot air transfer means that transfers hot air exhaled from the exhaust gas purifier through the hot air transfer path to the hot air storage space is arranged.

Description

  The present invention relates to a work vehicle, and more particularly to a work vehicle including an exhaust gas purification device.

  There exists what was disclosed by patent document 1 as one form of a working vehicle. That is, Patent Document 1 discloses a structure in which an engine is stored in an engine room, and exhaust gas from the engine is exhausted outside the engine room (outside the machine) through an exhaust pipe provided with an exhaust gas purification device in the middle. ing. The engine room is partitioned by a partition wall. The partition wall is provided with an exhaust air outlet provided with an intercooler, a radiator, and the like. Cooling air from a cooling fan linked to the engine is generated in the engine room. A structure is disclosed in which the intercooler and the radiator are cooled and then discharged to the outside of the engine room (outside the machine) through the exhaust outlet → the exhaust duct → the exhaust outlet. Further, the exhaust gas passing through the exhaust pipe is exhausted to the outside through the exhaust port.

  The exhaust gas purifier is configured to keep the inside at a high temperature in order to burn and remove particulate matter discharged from the engine with a high temperature exhaust gas. Therefore, the exhaust gas purifying device is disposed in the exhaust duct separated from the engine room by the partition wall so that the hot air emitted from the surface does not adversely affect the engine room, and the interior thereof is It is arrange | positioned above the exhaust outlet in the exhaust duct which is a place where exhaust wind does not hit so much so that it may be kept at high temperature.

JP 2012-246771 A

  However, in the above-described Patent Document 1, the exhaust gas purification device is disposed above the exhaust air outlet in the exhaust duct, which is a place where the exhaust air does not hit very much. The diffused hot air may remain around the exhaust gas purification device, causing problems such as malfunction of control components attached to the outer periphery of the exhaust gas purification device.

  Therefore, the present invention provides a work vehicle capable of transferring hot air emitted from the exhaust gas purification device to the hot air storage space and suppressing the temperature around the exhaust gas purification device from becoming high. With the goal.

  The invention according to claim 1 is a work vehicle configured to exhaust exhaust gas outside the engine room from an engine disposed in the engine room through an exhaust pipe provided with an exhaust gas purification device in the middle. An exhaust gas purification device is disposed at the front of the engine room, while a hot air storage space is disposed at the rear upper part of the engine room, and a hot air transfer path is formed between the exhaust gas purification device and the hot air storage space. In the engine room, hot air transfer means for transferring hot air emitted from the exhaust gas purification device through the hot air transfer path to the hot air storage space is provided.

  Invention of Claim 2 is invention of Claim 1, Comprising: The hot air accommodation space was connected with the exterior through the hot air discharge port, and the hot air in the hot air storage space was discharged from the hot air discharge port It is characterized by that.

  Invention of Claim 3 is invention of Claim 1 or 2, Comprising: A hot-air transfer means is a hot-air transfer cover body which coat | covers the front of an exhaust-gas purification apparatus, the left-right side, and upper direction, and hot-air transfer Between the front wall and the upper surface wall of the cover body, an inclined surface wall in a rearward inclined state is formed so that the hot air emitted from the exhaust gas purifier is transferred to the hot air transfer path along the front wall, the inclined surface wall, and the upper surface wall. It is transferred, and is further transferred from the hot air transfer path to the hot air accommodating space.

  The invention according to claim 4 is the invention according to claim 1 or 2, wherein the hot air transfer means is a hot air transfer fan disposed immediately in front of the exhaust gas purifying device, and the pumping force of the hot air transfer fan is used. The hot air emitted from the exhaust gas purification device is transferred to the hot air accommodation space through the hot air transfer path.

  The invention according to claim 5 is the invention according to claim 4, wherein temperature detecting means for detecting the temperature in the hot air transfer path is provided, and the temperature detecting means is equal to or higher than a predetermined upper limit threshold value. The hot air transfer fan is controlled to operate when the temperature is detected, while the hot air transfer fan is controlled to stop when the temperature detecting means detects a temperature below a predetermined lower threshold. And

  According to the present invention, since the hot air emitted from the exhaust gas purification device can be transferred to the hot air storage space through the hot air transfer path by the hot air transfer means, the temperature around the exhaust gas purification device is increased. Can be suppressed. Therefore, it is possible to suppress an adverse effect caused by an increase in the oil temperature in the engine room, an increase in the intake air temperature, and hot air from the control components disposed in the engine room.

The side view of the work vehicle as 1st Embodiment. Side surface explanatory drawing of the rear part as 1st Embodiment. Plane explanatory drawing of the rear part as a 1st embodiment. The back surface explanatory view of the rear part as a 1st embodiment. Cross-sectional side explanatory drawing of the engine room as 1st Embodiment. Explanatory drawing of hot air transfer by a hot air transfer cover body. Side surface explanatory drawing of the rear part as 2nd Embodiment. Plane explanatory drawing of the rear part as 2nd Embodiment. The back surface explanatory view of the rear part as a 2nd embodiment. Cross-sectional side explanatory drawing of the engine room as 2nd Embodiment. Side surface explanatory drawing of the rear part as 3rd Embodiment. Plane explanatory drawing of the rear part as 3rd Embodiment. The back surface explanatory view of the rear part as a 3rd embodiment. Cross-sectional side explanatory drawing of the engine room as 3rd Embodiment. Explanatory drawing of hot air transfer by a hot air transfer fan. Control block diagram.

  Embodiments of the present invention will be described below with reference to the drawings. That is, A shown in FIG. 1 is a work vehicle according to the present invention, and the work vehicle A is an articulated wheel loader that performs excavation work or loading work such as earth and sand.

[Outline of overall configuration of work vehicle A]
As shown in FIG. 1, the work vehicle A pivots the rear end portion of the front frame 1 of the front portion A1 and the front end portion of the rear frame 2 of the rear portion A2 by a pivot shaft 3 whose axis is directed in the vertical direction. The front part A1 and the rear part A2 are bent in a "<" shape in a plan view around the pivot shaft 3 so as to be articulated. In other words, the work vehicle A can be turned by appropriately turning the vehicle body into a folded state.

  The front part A1 is equipped with a loader 5 on the front frame 1 supported by a pair of left and right front wheels 4,4. The loader 5 is attached to upper ends of a pair of left and right arm columns 6 and 6 formed by standing up from the front frame 1 so that the base ends of the pair of left and right lift arms 7 and 7 can be pivoted up and down respectively. A bucket 8 is attached to the front end portions of 7 and 7 in a horizontal manner and freely rotatable up and down. Lift cylinders 9 and 9 are interposed between the middle portions of the lift arms 7 and 7 and the middle portions of the arm struts 6 and 6, respectively. A bell crank 11 extending in the vertical direction is attached to a bell crank support piece 10 interposed between the middle portions of the lift arms 7 and 7 so as to freely swing back and forth. A cylinder support piece 12 protrudes from the front frame 1 toward the front upper side between the arm struts 6 and 6, and a bucket cylinder is provided between the tip of the cylinder support piece 12 and the upper end of the bell crank 11. On the other hand, an interlocking link 14 is interposed between the lower end portion of the bell crank 11 and the bucket 8.

  The rear part A2 has a cabin 21 and a bonnet 22 mounted on the rear frame 2 supported by a pair of left and right rear wheels 20 and 20 adjacent to each other in the front-rear direction.

  As shown in FIGS. 2 and 5, the rear frame 2 has a pair of left and right plate-like frame forming pieces 2a, 2a extending in the front-rear direction and arranged in a face-to-face state with a certain distance in the left-right direction. A plurality of horizontal frame forming pieces (not shown) are horizontally mounted between the forming pieces 2a and 2a to form a frame in plan view.

  The cabin 21 is formed in a box shape and surrounds the operation unit 23. As shown in FIGS. 2 and 3, the operation unit 23 is formed with a flat surface floor 30 stretched between a pair of left and right frame forming pieces 2 a, 2 a to form a front half and a step. A convex sheet mount cover 31 is provided to form the latter half. A cylindrical steering column 32 extending in the vertical direction is erected on the front portion of the floor portion 30. An instrument panel 33 is disposed on the upper surface of the steering column 32, and a steering handle 35 is attached to the upper end portion of the steering shaft 34 that protrudes upward from the rear part of the instrument panel 33. Reference numeral 36 denotes an operation pedal group disposed on the floor 30.

  As shown in FIGS. 2, 3 and 6, the seat mount cover 31 includes a rectangular plate-shaped front wall surface portion 40 formed so as to rise upward from the floor portion 30, and an upper edge of the front wall surface portion 40. A quadrangular plate-like upper surface portion 41 formed horizontally extending rearward, and quadrangular plate-like left and right surface portions 42, 42 formed contiguously to the left and right end portions of these surface portions 40, 41. Forming.

  As shown in FIGS. 2 and 3, a seat 43 is disposed on the seat mount cover 31 immediately after the steering handle 35, and an operation lever 44 is disposed on the right side of the seat 43. . The seat mount cover 31 forms a front upper portion of the engine room 45. In the front upper part of the engine room 45, the front upper part of the engine 46 mounted on the rear part of the rear frame 2 is arranged. The engine 46 is an internal combustion engine constituted by, for example, a diesel engine. Reference numeral 48 denotes a foothold, and 49 denotes a rear fender.

  A flat partition wall 50 is erected on the rear frame 2 located behind the seat mount cover 31. The partition wall 50 has a lower half portion formed in a rear view portal shape and opens the back surface (rear surface) of the seat mount cover 31 in the front-rear direction, while the upper half portion is higher than the upper surface portion 41 of the seat mount cover 31. The front surface of the bonnet 22 is closed by being stretched.

  The engine room 45 includes a rear portion of the rear frame 2, a seat mount cover 31 disposed at the front upper portion thereof, a bonnet 22 disposed at the rear upper portion of the rear portion of the rear frame 2, and a rear end portion of the rear frame 2. And a counterweight 51 arranged horizontally.

  In the engine room 45, a bonnet support frame 52 is erected so as to be located behind the partition wall 50, and a pivotal support portion 53 is provided at the upper end portion of the bonnet support frame 52. By pivotally connecting, the bonnet 22 can be freely opened and closed with the pivotal portion 53 as the center.

  As shown in FIGS. 2 to 5, the bonnet 22 includes a pair of left and right side wall forming pieces 22 a, 22 a formed in a quarter arc plate shape, and a ceiling wall forming piece 22 b laid between upper end edges thereof. And formed from. In the rear lower part of the ceiling wall forming piece 22b, a horizontally long trapezoidal upper air outlet 54 is formed to open in the front-rear direction, and a cylindrical downstream side projecting forward at the peripheral edge of the upper air outlet 54 A wind guide piece 22c is formed.

  The counterweight 51 is formed in a U-shape in plan view using a casting or the like, and is laid horizontally between the rear ends of the frame forming pieces 2a and 2a. And while forming the lower exhaust port 55 in the center upper half part, the opening part 56 is formed in the center lower half part.

[Description in engine room 45]
Next, the components disposed in the engine room 45 will be described with reference to FIG. The engine 46 is disposed in the center of the engine room 45 by being mounted on the rear part between the frame forming pieces 2 a and 2 a forming the rear frame 2 via the engine mount 60.

  An exhaust gas purification device 47 is attached to the front upper part of the engine 46 via a pair of left and right stays 61, 61. The exhaust gas purification device 47 is formed in a cylindrical box shape extending in the left-right direction, and is formed to be shorter than the left-right width of the engine 46. An inflow port portion formed on the right side of the exhaust gas purifying device 47 is connected to the exhaust port for discharging the exhaust gas of the engine 46 via the upstream side exhaust pipe 62. The outlet portion 63 formed at the lower left portion of the exhaust gas purification device 47 is connected to the proximal end portion of the downstream exhaust pipe 64 so that the front half 64a of the downstream exhaust pipe 64 extends downward to the right and the latter half. 64b is extended rearward along the right side wall of the engine 46 from the lower right side, and the tip opening 64c is opened rearward from the opening 56 of the counterweight 51. Then, the exhaust gas discharged from the engine 46 flows into the exhaust gas purification device 47 through the upstream side exhaust pipe 62 and is purified by the exhaust gas purification device 47, and then the front end opening through the downstream side exhaust pipe 64. 64c is discharged to the rear of the aircraft. The exhaust gas purifying device 47 also functions as a silencer (silencer) that silences exhaust noise of the exhaust gas.

  The engine 46 has a fan shaft 65 protruding rearward, and a cooling fan 66 is interlocked and connected to the fan shaft 65, and a radiator 67 is disposed immediately behind the cooling fan 66. 68 is a cool air guide shroud interposed between the radiator 67 and the cooling fan 66, 69 is a cylindrical upstream exhaust guide piece for guiding exhaust air exhausted rearward through the radiator 67, and 70 is an upstream exhaust air. It is a sealing material provided at the peripheral edge of the rear end of the guide piece 69, and the downstream side exhaust guide piece 22 c of the closed bonnet 22 abuts against the seal material 70 in the pressed state, and the upper and downstream side exhaust guide pieces 69 and 22c are communicated with each other so that a wind guide function is achieved. 71 is a feed pipe for feeding the radiator liquid from the engine 46 to the radiator 67, and 72 is a return pipe for returning the radiator liquid from the radiator 67 to the engine 46.

  An air cleaner 73 extending in the left-right direction is disposed in the bonnet 22, and outside air is sucked into the air cleaner 73 through the intake pipe 74, the outside air is purified in the air cleaner 73, and then the intake port of the engine 46 through the air supply pipe 75. I am trying to air. An ECU (engine control unit) 76 and the like are disposed immediately before the air cleaner 73.

  With this configuration, when the engine 46 is driven, the cooling fan 66 interlocked with the engine 46 is rotated via the fan shaft 65 so that cooling air is generated by the cooling fan 66. The cooling air generated by the cooling fan 66 cools the radiator 67 through the cold air guide shroud 68 and then passes from the upper exhaust port 54 and the lower exhaust port 55 to the outside of the engine room 45 through the upper / downstream exhaust guide pieces 69 and 22c ( The air is discharged to the outside of the machine).

  In the work vehicle A configured as described above, in the present embodiment, as shown in FIGS. 2 to 15, the exhaust gas purifying device 47 is disposed at the front portion in the engine room 45, while A hot air storage space 80 is disposed in the rear upper portion, that is, the hot air storage space 80 is formed in the closed hood 22, and a hot air transfer path 81 is provided between the exhaust gas purification device 47 and the hot air storage space 80. In the engine room 45, the hot air transfer means for transferring the hot air emitted from the exhaust gas purification device 47 through the hot air transfer path 81 to the hot air storage space 80 is provided in the engine room 45. The hot air storage space 80 can be communicated with the outside through the hot air discharge port 82 so that the hot air in the hot air storage space 80 is discharged from the hot air discharge port 82.

  The hot air transfer means is a hot air transfer cover body 83 that covers the front, left and right sides, and the upper side of the exhaust gas purification device 47, and the rear wall between the front wall 84 and the upper surface wall 86 of the hot air transfer cover body 83 The inclined surface wall 85 in the inclined state is formed, and hot air emitted from the exhaust gas purification device 47 is transferred through the hot air transfer path 81 along the front wall 84, the inclined surface wall 85, and the upper surface wall 86. To the hot air accommodating space 80. Further, the hot air transfer means is the hot air transfer fan 100 disposed immediately before the exhaust gas purification device 47, and the hot air diffused from the exhaust gas purification device 47 by the pressure feeding force of the hot air transfer fan 100 is the hot air transfer path 81. It can be made to be transferred to the hot air accommodating space 80 through. In the hot air transfer path 81, a temperature sensor 112 is disposed as a temperature detecting means for detecting the temperature in the hot air transfer path 81, and the temperature sensor 112 detects a temperature equal to or higher than a predetermined upper limit side threshold value. In this case, the operation of the hot air transfer fan 100 is controlled. On the other hand, when the temperature sensor 112 detects a temperature equal to or lower than a predetermined lower threshold, the hot air transfer fan 100 can be controlled to stop. .

  In the following, a configuration in which hot air emitted from the exhaust gas purifying device 47 is transferred to the hot air accommodating space 80 through the hot air transfer path 81 by arranging the hot air transfer means as the hot air transfer cover body 83 is shown in FIG. The first embodiment shown in FIG. 6 is used, and the configuration in which the hot air accommodating space 80 communicates with the outside through the hot air discharge port 82 is the second embodiment shown in FIGS. 7 to 10, and the hot air transfer means is hot air transfer. FIG. 11 to FIG. 15 show a configuration in which the hot air emitted from the exhaust gas purification device 47 through the hot air transfer path 81 communicates with the outside through the hot air accommodating space 80 and the hot air outlet 82 by being arranged as the fan 100. This will be described in detail as a third embodiment.

[Description of First Embodiment]
In the first embodiment, as shown in FIGS. 2 to 6, a hot air transfer cover 83 as hot air transfer means is disposed in the engine room 45. That is, the hot air transfer cover body 83 is attached to the front portion in the seat mount cover 31, and the front, left and right sides, and the upper side of the exhaust gas purification device 47 are covered with the hot air transfer cover body 83. The hot air transfer cover body 83 has a lower end edge of an inclined surface wall 85 formed in a horizontally long rectangular plate shape in the left-right direction connected to an upper end edge of a front wall 84 formed in a horizontally long rectangular plate shape in the left and right direction, A front end edge of an upper surface wall 86 formed in the shape of a rectangular plate that is horizontally long is connected to the upper end edge of the inclined surface wall 85, and a pentagon is formed on each of the left and right end edges of these surface walls 84, 85, 86 The left and right side walls 87, 87 formed in a plate shape are connected to each other.

  The hot air transfer cover body 83 is disposed with a space between the inner surface of the seat mount cover 31 and forms a heat insulating space S between the inner surface of the seat mount cover 31 and the outer surface of the hot air transfer cover body 83. Yes. That is, the front wall 84 of the hot air transfer cover body 83 is arranged on the front wall surface portion 40 of the seat mount cover 31 with a gap in a facing state, and the front wall 84 is attached to the front wall surface portion 40 via the lower bracket 90 with the mounting bolts. 91 is attached. The upper surface wall 86 of the hot air transfer cover body 83 is disposed on the upper surface portion 41 of the seat mount cover 31 with a gap in a facing state, and the upper surface wall 86 is attached to the upper surface portion 41 via the upper bracket 92 with mounting bolts 93. Yes.

  Further, the hot air transfer cover body 83 is arranged with a space between the exhaust gas purification device 47 and a hot air transfer path 81 is provided between the inner surface of the hot air transfer cover body 83 and the surface of the exhaust gas purification device 47. Forming. a is a hot air transfer direction in which hot air is transferred in the hot air transfer path 81. The upper half of the hot air accommodating space 80 formed in the closed bonnet 22 is disposed at a higher position than the rear end (terminal) of the hot air transfer path 81.

  With such a configuration, the hot air emitted from the exhaust gas purifying device 47 is lightweight, so that it is transferred rearward and upward along the front wall 84, the inclined wall 85, and the upper wall 86 in the hot air transfer path 81. . At this time, when the hot air is transferred along the inclined wall 85, it is firmly guided rearward and upward and transferred from the hot air transfer path 81 toward the hot air accommodating space 80 to generate a flow of hot air flow. That is, since the hot air emitted from the exhaust gas purification device 47 is transferred to the hot air accommodating space 80, the ambient temperature around the exhaust gas purification device 47 is reduced to a predetermined upper threshold (for example, 60 ° C.) or less. Retained. As a result, the heat insulation effect of the seat mount cover 31 by the heat insulation space S can be secured satisfactorily, and the working environment of the operator who sits on and operates the seat 43 placed on the seat mount cover 31 is improved. Can be secured. In addition, it is possible to suppress an adverse effect caused by a rise in oil temperature in the engine room 45, a rise in intake air temperature, and hot air of control components disposed in the engine room 45.

[Description of Second Embodiment]
In the second embodiment, as shown in FIGS. 7 to 10, a hot air transfer cover body 83 as hot air transfer means is disposed in the engine room 45, and the basic structure is configured in the same manner as in the first embodiment. However, it differs in that the hot air accommodating space 80 communicates with the outside through the hot air outlet 82.

  That is, the bonnet 22 according to the second embodiment forms a bulging portion 22d having a flat trapezoidal cross section that bulges outward slightly in the center of the ceiling wall forming piece 22b and extending in the vertical direction. A hot air discharge port 82 is opened downward at the lower end of 22d. A hot air discharge path 94 extending in the vertical direction is formed inside the bulging portion 22 d, and the end of the hot air discharge path 94 communicates with the hot air discharge port 82. b is the hot air discharge direction.

  With this configuration, in the second embodiment, the hot air stored in the hot air storage space 80 is discharged from the hot air discharge port 82 to the outside (outside the machine) through the hot air discharge path 94. That is, the hot air diffused from the exhaust gas purification device 47 can be discharged outside the apparatus, and the ambient temperature around the exhaust gas purification device 47 can be steadily reduced. Therefore, the effect obtained in the first embodiment can be further ensured.

[Description of Third Embodiment]
In the third embodiment, as shown in FIGS. 10 to 13, a hot air transfer path forming body 102 is attached to the front portion in the seat mount cover 31, and the hot air transfer path forming body 102 is connected to the front of the exhaust gas purification device 47. The left side and upper side are covered. A hot air transfer fan 100 as hot air transfer means is attached to the hot air transfer path forming body 102.

  The hot air transfer path forming body 102 is provided with a front end edge of an upper surface wall 104 formed in a horizontally-long rectangular plate shape in the left-right direction, and an upper end edge of a front wall 103 formed in a horizontally-long rectangular plate shape in the left-right direction. The left and right side walls 105, 105 formed in a square plate shape are connected to the left and right end edges of the face walls 103, 104, respectively.

  The hot air transfer path forming body 102 is disposed with a space between the inner surface of the seat mount cover 31 and forms a heat insulating space S between the inner surface of the seat mount cover 31 and the outer surface of the hot air transfer path forming body 102. doing. In other words, the front wall 103 of the hot air transfer path forming body 102 is disposed on the front wall surface portion 40 of the seat mount cover 31 with a gap in a facing state, and the front wall 103 is attached to the front wall surface portion 40 via the lower bracket 107. It is attached with bolts 108. The upper surface wall 104 of the hot air transfer path forming body 102 is arranged in a face-to-face state on the upper surface portion 41 of the seat mount cover 31 with a space therebetween, and the upper surface wall 104 is attached to the upper surface portion 41 via the upper bracket 109 with mounting bolts 110. ing. Reference numeral 111 denotes a lower end opening of the heat insulating space S.

  Further, the hot air transfer path forming body 102 is disposed with a space between the surface of the exhaust gas purification device 47 and the hot air transfer path forming body 102 is heated between the inner surface of the hot air transfer path forming body 102 and the surface of the exhaust gas purification device 47. A transfer path 81 is formed.

  An intake port 106 that opens in the front-rear direction is formed in the upper left portion of the front wall 103 of the hot air transfer path forming body 102, and the hot air transfer fan 100 is attached to the rear surface of the upper left portion of the front wall 103 in alignment with the intake port 106. Yes.

  The bonnet 22 of the third embodiment is formed in the same manner as the bonnet 22 of the second embodiment having the bulging portion 22d, and the hot air stored in the hot air storage space 80 is externally passed through the hot air discharge passage 94 from the hot air discharge port 82. It is discharged to (outside the machine).

  In the hot air transfer path 81, a temperature sensor 112 is disposed as temperature detecting means for detecting the temperature in the path. In other words, in the present embodiment, the temperature sensor 112 is disposed at the rear corner formed by the upper surface wall 104 and the right side wall 105 of the hot air transfer path forming body 102 in the hot air transfer path 81. As shown in FIG. 16, when the temperature sensor 112 detects a temperature not lower than a predetermined upper limit side threshold (for example, 60 ° C.) as the temperature in the hot air transfer path 81, the hot air transfer fan 100 is driven. When the temperature sensor 112 detects a temperature lower than a predetermined lower limit side threshold value (for example, 50 ° C.) as the temperature in the hot air transfer path 81, the control unit 113 controls the hot air transfer fan 100 to stop. Yes. Here, the control unit 113 is disposed at an appropriate position of the rear portion A2 such as the operation unit 23, and includes a CPU (Central Processing Unit), a RAM, a ROM, and the like, and a temperature sensor at an input side interface thereof. While connecting 112, the hot air transfer fan 100 is connected to the output side interface.

  With this configuration, when the hot air transfer fan 100 is driven, outside air is sucked from the lower end opening 111 of the heat insulating space S through the rear frame 2 by the suction force generated behind the hot air transfer fan 100. The air is sucked into the hot air transfer fan 100 through the air inlet 106 and is pumped backward by the hot air transfer fan 100. If it does so, the hot air in the hot air transfer path 81 diverged from the exhaust-gas purification apparatus 47 will be forcedly transferred toward the hot air accommodation space 80 of the back. In this way, the flow of hot air in the hot air transfer path 81 is generated smoothly and steadily. Then, the hot air stored in the hot air storage space 80 is discharged from the hot air discharge port 82 to the outside (outside the machine) through the hot air discharge path 94.

  In the third embodiment configured as described above, the hot air transfer fan 100 is driven when the temperature sensor 112 detects a temperature equal to or higher than a predetermined upper threshold value, while the temperature sensor 112 is equal to or lower than a predetermined lower threshold value. Since the hot-air transfer fan 100 is stopped when the temperature is detected, the temperature in the hood 22 can be kept within a predetermined temperature range. That is, when the engine 46 is stopped while the exhaust gas purifying device 47 is self-regenerating, or when the engine 46 is stopped after self-regeneration, the cooling fan 66 linked to the engine 46 is also stopped. However, if the engine 46 is stopped within 10 minutes after self-regeneration, for example, the hot air transfer fan 100 for 3 minutes after the engine stops. By driving, it is possible to reliably discharge the bulk heat (residual heat) in the hot air transfer path 81. Here, for example, the reason why the hot air transfer fan 100 is driven for a short time of 3 minutes is to prevent the battery from running out due to the operation of the hot air transfer fan (particularly, the long time operation).

  The exhaust gas purification device 47 purifies the exhaust gas by allowing the exhaust gas discharged from the engine 46 to pass inside. Here, the exhaust gas purification device 47 collects and burns particulate matter (hereinafter also referred to as “PM”) mainly composed of black smoke in the exhaust gas discharged from the engine and filters it. Is. If the exhaust gas temperature passing through the exhaust gas purification device 47 exceeds a self-renewable temperature (for example, 250 ° C.), the PM deposited in the exhaust gas purification device 47 can be oxidized and removed, and the exhaust gas The PM collection ability of the purification device 47 is restored. That is, in the present embodiment, the exhaust gas purification device 47 is a continuous regeneration type that burns and removes by the heat of the exhaust gas, so that the exhaust gas purification device 47 is prevented from being clogged.

  Further, as the fourth embodiment, the bonnet 22 of the first embodiment can be adopted instead of the bonnet 22 of the third embodiment. In the fourth embodiment, the hot air pumped by the hot air transfer fan 100 is not discharged outside (outside the machine) from the hot air discharge port 82 through the hot air discharge path 94, but the upper and lower air discharge ports 54, 55 and It is forcibly discharged to the outside (outside the machine) through the opening 56.

45 Engine room 46 Engine 47 Exhaust gas purification device 80 Hot air storage space 81 Hot air transfer path 100 Hot air transfer fan 112 Temperature sensor

Claims (5)

A working vehicle that exhausts exhaust gas out of the engine room through an exhaust pipe provided with an exhaust gas purification device in the middle from an engine disposed in the engine room,
An exhaust gas purification device is disposed at the front of the engine room, while a hot air storage space is disposed at the rear upper part of the engine room, and a hot air transfer path is formed between the exhaust gas purification device and the hot air storage space. do it,
A working vehicle characterized in that hot air transfer means for transferring hot air emitted from the exhaust gas purification device through a hot air transfer path to a hot air storage space is disposed in the engine room.   The work vehicle according to claim 1, wherein the hot air storage space communicates with the outside through a hot air discharge port so that the hot air in the hot air storage space is discharged from the hot air discharge port.   The hot air transfer means is a hot air transfer cover body that covers the front, left and right sides, and the upper side of the exhaust gas purifying device, and an inclined surface wall that is tilted backward between the front wall and the upper surface wall of the hot air transfer cover body. The hot air emanating from the exhaust gas purification device is transferred to the hot air transfer path along the front wall, the inclined surface wall, and the upper surface wall, and further transferred from the hot air transfer path to the hot air storage space. The work vehicle according to claim 1 or 2.   The hot air transfer means is a hot air transfer fan disposed immediately before the exhaust gas purification device, and hot air emitted from the exhaust gas purification device is transferred to the hot air accommodation space through the hot air transfer path by the pressure feeding force of the hot air transfer fan. The work vehicle according to claim 1, wherein the work vehicle is configured as described above.   In the hot air transfer path, temperature detecting means for detecting the temperature in the path is disposed, and when the temperature detecting means detects a temperature equal to or higher than a predetermined upper limit side threshold value, the hot air transfer fan is controlled in operation, 5. The work vehicle according to claim 4, wherein the hot air transfer fan is controlled to stop when the temperature detecting means detects a temperature equal to or lower than a predetermined lower threshold.

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