JP6224749B2 - Work vehicle - Google Patents

Description

  The present invention relates to a work vehicle including a filter device that captures and removes particulate matter contained in exhaust gas from a diesel engine.

  Patent Document 1 in which a filter device that captures and removes particulate matter contained in exhaust gas from a diesel engine is disposed on the upper side of the engine, and a radiator that cools the engine is provided on the front side of the engine A work vehicle shown in FIG.

JP 2008-31955 A

In the work vehicle of the above document, in order to prevent the heat on the filter device side that should be kept at a high temperature in order to maintain the efficiency of filter regeneration from being transmitted to members such as the engine and the bonnet arranged on the upper side of the filter device, In addition to providing a separate heat insulating material on a member such as a bonnet, the filter device disposed on the upper side of the engine may hinder the flow of air from the radiator side, which may reduce the cooling efficiency of the engine or the like.
The present invention provides a work vehicle in which a filter device that captures and removes particulate matter contained in exhaust gas is disposed on the upper side of the engine without interfering with the flow of air from the radiator side that cools the engine. It is an object of the present invention to provide a work vehicle in which heat on the filter device side is prevented from being conducted to various members on the upper side.

In order to solve the above problems, first, a filter device 34 that captures and removes particulate matter contained in exhaust gas from the diesel engine 4 is disposed above the engine 4, and the engine 4 A work vehicle provided with a radiator 28 for cooling the front side of the engine 4, wherein the filter device 34 is horizontally placed so as to face in the left-right direction, and the upper part in the left-right direction center in the rear part of the engine 4. The air that is locked in an inverted L shape in a side view so as to cover the upper and rear sides of the filter device 34 and flows from the radiator 28 side to the filter device 34 side through the cooling fan 29 provided with a heat shielding cover 38 for guiding the rear and downwards, and bent front end portion of the shielding heat cover 38 upward, exhaust Manihoru that plumbed from the engine 4 39 to bypass the outside of the heat insulating cover 38 in a side view the is characterized in that connected to the filter device 34.

  Secondly, the cooling fan 29 for sucking the air on the front side toward the radiator 28 and the fan shroud 31 of the cooling fan 29 are arranged behind the radiator 28, and the control unit 27 for controlling the operation of the engine 4 is provided. The fan shroud 31 is provided on the side portion.

  A filter device 34 that captures and removes particulate matter contained in exhaust gas from the diesel engine 4 is disposed above the engine 4, and a radiator 28 that cools the engine 4 is disposed in front of the engine 4. A working vehicle provided on the side, wherein the filter device 34 is disposed horizontally above the left side of the engine 4 in a state where the filter device 34 is horizontally oriented. A heat shield cover 38 that is locked in an inverted L shape in a side view so as to cover the rear side and guides the air flowing from the radiator 28 side to the filter device 34 side through the cooling fan 29 backward and downward. The exhaust manifold piped from the front engine is detoured to the outside of the heat shield cover 38 in a side view and connected to the filter device 34 Therefore, it is necessary to provide heat insulating material on the inner surface side of the bonnet that covers the upper side of the engine and the heat on the filter device side that is kept at a higher temperature for efficiency of filter regeneration is suppressed from being conducted to the upper side. Since air that has flowed from the front side to the filter device side is guided rearward and downward, it is possible to efficiently prevent a decrease in cooling efficiency due to air retention.

  Further, if a cooling fan that sucks air on the front side to the radiator side and a fan shroud of the cooling fan are arranged behind the radiator, and a control unit that controls the operation of the engine is provided on the side of the fan shroud. Thus, it becomes easy to stably operate the control unit provided on the side of the fan shroud where the temperature is relatively difficult to rise.

It is a front view of the agricultural tractor to which the work vehicle of the present invention is applied. It is a top view of the agricultural tractor to which the work vehicle of this invention is applied. It is a side view of the agricultural tractor to which the work vehicle of the present invention is applied. It is a side view which shows the structure of the engine room of a closed state. It is a side view which shows the structure of the engine room of the state which abbreviate | omitted the bonnet. It is an enlarged side view of DPF and its periphery. It is a top view which shows the arrangement configuration of ECU. It is a side view which shows the arrangement configuration of ECU.

  1 to 3 are a front view, a plan view, and a side view of an agricultural tractor to which the work vehicle of the present invention is applied. In this tractor, an engine room 6 in which an engine 4 for driving each part is housed is formed in a front half portion on a chassis frame 3 supported by a pair of left and right front wheels 1 and 1 and rear wheels 2 and 2 (see FIG. 4, see FIG. 5 and the like), the engine room 6 is openably and closably covered by a bonnet 7, and a traveling unit body 9 is configured by installing a control unit 8 behind the bonnet 7. A work machine (not shown) such as a rotary tiller is connected to the rear part of the traveling machine body 9 via a lift link 11 so as to be lifted and lowered.

  The bonnet 7 includes a top plate 12 that covers the upper side of the engine room 6, a pair of left and right side covers 13 and 13 that cover the left and right sides of the engine room 6, and a front grille 14 that covers the front of the engine room 6. It is comprised by making it join. The front grill 14 has an upper portion and a lower portion, which are provided with ventilation portions 14a each having a large number of perforated holes. Between the upper ventilation portion 14a and the lower left and right ventilation portions 14a, 14a, respectively. A pair of left and right headlamps 16 are provided.

  The bonnet 7 is supported on the traveling machine body 9 side so as to be rotatable up and down around a horizontal axis on its rear end side and upper end side. When the bonnet 7 is rotated upward to the uppermost position facing diagonally upward, the engine room 6 is opened, while the bonnet 7 is rotated downward to the lowermost position facing the horizontal direction. As a result, the engine room 6 is closed.

  The steering unit 8 is disposed between the seat 18 located between the left and right rear fenders 17 and 17 in plan view, the front operation panel 19 in front of the seat 18, and between the seat 18 and the left and right fenders 17 and 17. Side operation panels 21 and 21 and a floor step 22 which is a floor formed between the seat 18 and the front operation panel 19. The front operation panel 19 is provided with a steering handle 23, and a lift lever 24 for lifting and lowering the work implement is supported on one side of the left and right side operation panels 21 and 21, and a traveling shift operation is performed on the other side. A transmission lever 26 and the like are arranged.

  An operator seated on the seat 18 of the steering unit 8 of the tractor performs a tilling operation on a farm field or the like by causing the traveling machine body 9 to travel forward while driving the lowered working machine.

  FIG. 4 is a side view showing the configuration of the engine room in the closed state, and FIG. 5 is a side view showing the configuration of the engine room in a state where the hood is omitted. The engine 4 is disposed in a rear portion of the engine room 6 in a state of being firmly attached and supported on the upper surface side of the chassis frame 3. The engine 4 is a common rail diesel engine that appropriately controls the injection timing of the high-pressure fuel by an ECU 27 (see FIGS. 7 and 8) that is a control unit configured by a microcomputer.

  A radiator 28 having a front-view shape and a thickness in the front-rear direction is disposed in front of the engine 4. A cooling fan 29 that is rotationally driven by engine power is disposed behind the radiator 28 and in front of the engine 4. A fan shroud 31 which is a wind guide body surrounding the left and right and upper and lower sides of the cooling fan 29 is provided, and the rear end portion of the radiator 28 partitions the engine room 6 back and forth to block heat conduction. A partition plate 32 is disposed.

  The air flowing into the engine room 6 from the ventilation portion 14a of the front grille 14 is sucked from the front side of the radiator 28 by the cooling fan 29 that is driven to rotate, and is discharged from the rear side of the radiator 28, Cooling water in the radiator 28 is cooled.

  For this reason, the cooling water that has cooled the engine 4 to a high temperature is sent to the upper side of the radiator 28. The cooling water sent to the upper portion of the radiator 28 is cooled by the air blow-off in the process of moving to the lower portion of the radiator 28, and is returned to the engine 4 side again to cool the engine 4 again. This cooling circulation cycle is repeated.

  A cylindrical air cleaner 33 for purifying air sent to the engine 4 side is installed in front of the radiator 28 in a posture directed in the left-right direction, and above the engine 4 in a close state, A DPF (registered trademark) 34 which is a filter device for capturing particulates (particulate matter, fine solids) such as soot and graphite contained in the exhaust gas from the engine 4 is provided.

The air purified by the air cleaner 33 is sent to the engine 4 side through an intake manifold 36 piped from the air cleaner 33 toward the engine 4 and used for fuel combustion. Incidentally, a fuel tank (not shown) in which fuel is stored is provided in the engine room 6.
And in the space between the control unit 8 and the control unit 8.

  FIG. 6 is an enlarged side view of the DPF and its surroundings. As shown in FIGS. 4 to 6, the DPF 34 formed in a cylindrical shape is installed in the center in the left-right direction in the rear part on the upper surface side of the engine 4 in a state of being horizontally placed so as to extend in the left-right direction.

  The case of the cylindrical DPF 34 extending in the left-right direction is divided into left and right parts, and flange portions 37a are integrally formed at the joint ends of the left and right divided cases 37, and the flange portions 37a are bolted together. By doing so, both the split cases 37 are connected and fixed. A heat shield plate (heat shield cover) 38 to be described later is fastened and fixed to the flange portion 37a.

  An oxidation catalyst and a filter (not shown) are provided in the DPF 34, the terminal end portion of the exhaust manifold 39 is connected to a position near the left and right ends (inflow ends) of the DPF 34, and the tail pipe 41 is positioned near the left and right ends (outflow ends). The start end is connected.

  The exhaust manifold 39 is piped from the side surface (left side surface in the illustrated example) closer to the above-described inflow end in the engine 4 toward the DPF 34 side. The tail type 41 from the position close to the outflow end of the DPF 34 passes through the front side of the DPF 34 on the upper surface side of the engine 4 to reach the side surface of the engine 4 near the above-described inflow end, and then along the side surface of the shear type 41. The pipe extends downward to the sea frame 3 side and then extends forward.

  In the engine 4, the exhaust gas generated when the fuel is burned in the purified air is sent to the DPF 34 through the exhaust manifold 39 through a short path. The exhaust gas flowing into the DPF 34 is purified in the process of flowing in the order of oxidation catalyst → filter, and the particulates in the exhaust gas described above are captured on the upstream surface of the filter. The exhaust gas thus purified by removing the particulates is exhausted to the outside through the tail pipe 41. Incidentally, the DPF 34 also has a certain level of mute function.

  By the way, in this DPF 34, as time passes, foreign matters such as particulates adhere to and accumulate on the filter, and air permeability, removal performance and the like deteriorate. For this reason, a regeneration means for removing the foreign matter adhering to the filter and regenerating the purification function of the DPF 34 is provided. By the way, the amount of foreign matter adhering to the filter can be detected by a pressure sensor or the like that detects the pressure difference between the upstream side and the downstream side of the filter. The DPF is regenerated by the regenerating means.

  The regeneration means increases the temperature in the DPF 34 by a predetermined level or more by driving the engine 4 at a high rotational speed and increasing the temperature inside the DPF 34 by direct combustion of fuel, etc. Configured to remove.

Further, the above-described heat shield plate 38 is reverse to the side view L so as to cover the upper side and the rear side of the DPF 34.
Extending in the lateral direction and curved in shape, the front end portion of the heat shield plate 38 by being bent upward direction, and functions as a guide portion 38a. This guide part 38a branches the air which flows backward toward the DPF 34 side up and down. The branched air is guided rearward and downward along the side view DPF 34 by the heat shield plate 38.

  In addition, mounting seats 38b projecting toward the flange portion 37a are integrally extended at a plurality of locations (three locations in the illustrated example) on the surface of the heat shield plate 38 that faces the flange portion 37a. The plurality of mounting seats 38b are fastened and fixed to the pair of flange portions 37a described above so that a predetermined gap is formed between the heat shield plate 38 and the peripheral surface of the DPF 34. A hot plate 38 is attached and fixed.

  7 and 8 are a plan view and a side view showing the arrangement configuration of the ECU. The ECU 27 is formed in a rectangular plate shape, and is attached and supported on the side surface side of the fan shroud 31. Specifically, the fan shroud 31 is attached and supported on the back side of the partition plate 32 and is disposed near the engine 4, but is held at a low temperature by the cooling fan 29. An ECU 27 is installed along the side surface of the fan shroud 31 in a vertically placed state.

  For this reason, the ECU 27 is kept at an appropriate temperature, and it is not necessary to provide a separate cooling device, and the ECU 27 is disposed behind the partition plate 32 close to the engine 4, so that the wiring from the ECU 27 to the engine 4 can be simply configured. .

  According to the tractor configured as described above, since the DPF 34 is disposed at the rear part on the upper surface side of the engine 4, it is not necessary to increase the ground height of the middle part and the front part of the bonnet 7. In addition to preventing the front view of the operator seated on the seat 18 of the section 8 from being obstructed, the DPF 34 is positioned at the rear part of the upper surface side of the engine 4 and the central part in the left-right direction, so that the weight balance is also good. Become.

  In addition, since the high-temperature DPF 34 is disposed in a horizontally placed state on the rear side of the engine 4 away from the radiator 28, it is possible to prevent cooling of the engine 4 and prevent the DPF 34 from Since the temperature can be maintained at a predetermined level or more, adhesion of particulates to the filter can be suppressed to the minimum, and the regeneration work of the DPF 34 that is in a high temperature state can be performed smoothly. By the way, the DPF 34 is connected to the engine 4 at a short distance via the exhaust manifold 39, and the exhaust gas from the engine 4 reaches the DPF 34 without becoming low temperature. This also prevents clogging of the filter. In addition, the DPF 34 can be efficiently regenerated.

  Further, since heat conduction to the bonnet 7 side is suppressed by the heat shield plate 38 covering the range from the upper side to the rear side of the DPF 34, it is not necessary to provide a heat insulating material on the bonnet 7 itself. It also functions to guide air, and the air from the radiator 28 side moves downward along the front and back surfaces of the heat shield 38 after passing over the DPF 34, resulting in disturbance of the air flow. It is difficult to adversely affect the cooling performance on the radiator 28 side.

4 Engine 27 ECU (control unit, microcomputer)
28 Radiator 29 Cooling fan 31 Fan sheroud (wind guide plate)
34 DPF (filter device)
38 Heat shield (heat shield cover)

Claims (2)

A filter device (34) that captures and removes particulate matter contained in the exhaust gas from the diesel engine (4) is disposed above the engine (4) to cool the engine (4). A work vehicle in which a radiator (28) is provided on the front side of the engine (4), and the filter device (34) is placed sideways so as to face in the left-right direction, and the rear side of the engine (4) Arranged above the central part in the left-right direction, locked in an inverted L shape in side view so as to cover the upper and rear sides of the filter device (34), and from the radiator (28) side through the cooling fan (29) The heat shield cover (38) for guiding the air flowing toward the filter device (34) side backward and downward is provided, and the front end portion of the heat shield cover (38) is bent upward to form the engine (4). ) Work vehicle, characterized in that said al pipe has been exhaust manifold (39) in side view, bypassing the outer heat shield (38) is connected to a filter device (34). The cooling fan (29) for sucking the air on the front side toward the radiator (28) and the fan shroud (31) of the cooling fan (29) are arranged at the rear of the radiator (28) to operate the engine (4). The work vehicle according to claim 1, wherein a control unit (27) for controlling the operation is provided on a side portion of the fan shroud (31).

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