JP2021000061A - Working machine - Google Patents

Abstract

To configure a working machine capable of favorably cooling an exhaust treatment device without enlarging an engine room.SOLUTION: A working machine comprises: an engine room S in which a cooling air is supplied by a cooling fan 21 from one end side to the inside thereof and in which an engine 4 is disposed; an exhaust treatment device 25 disposed in the engine room S on an upper side of the engine 4 for cleaning exhaust gas of the engine 4; and a guide plate 40 whose projection end has such an attitude as to head for downward toward a position separating from an exhaust port Se, for guiding the cooling air exhausted from the exhaust port Se of the engine room to the lower side.SELECTED DRAWING: Figure 3

Description

The present invention relates to a working machine that performs work by the driving force of an engine.

In Patent Document 1 as a working machine configured as described above, an engine is covered with an engine cover, a driver's seat is provided on the upper surface of the engine cover, and a radiator and a cooling fan are arranged on the outer end side of the engine cover. A combine with an exhaust treatment device placed in the engine room inside the engine cover is shown.

In the working device configured in this way, the exhaust treatment device can be cooled by the air flowing from the cooling fan to the air passage.

Japanese Unexamined Patent Publication No. 2017-9297

Diesel engines are often used in work machines for harvesting crops, and many are equipped with an exhaust treatment device that reduces particulate matter contained in exhaust gas. In this type of working machine, harvesting may be performed in an environment where many leaf and stem fragments generated during harvesting are scattered. For example, scattered matter including leaf and stem fragments adheres to the exhaust treatment device. In some cases, it could be imagined that the scattered matter would become hot and the scattered matter would ignite.

From this point of view, it is desirable that the exhaust treatment device is positively cooled by the cooling air, and it is also desirable that the adhesion of scattered matter including leaf and stem debris is suppressed. Although it is conceivable to increase the volume of the engine room in response to such a problem, there is a limit to the expansion of the volume of the engine room in the working machine for harvesting work from the viewpoint of suppressing the increase in size of the entire body. In addition, although it is desirable to actively cool the exhaust treatment device and smooth the flow of cooling air in the engine room from the viewpoint of suppressing the adhesion of scattered matter, in the working machine, the cooling air is emitted from the engine room. There was room for improvement in many cases where the equipment necessary for work was placed at the discharged part.

For this reason, a working machine capable of satisfactorily cooling the exhaust treatment device without expanding the engine room is required.

The characteristic configuration of the working machine according to the present invention is an engine, a cooling fan for cooling the engine, and an engine in which cooling air is supplied from one end side to the inside by the cooling fan and the engine is arranged inside. A room, an exhaust treatment device arranged above the engine in the engine room to purify the exhaust gas of the engine, and cooling air are blown to the other end side of the engine room opposite to the cooling fan. An exhaust port for discharging is formed, and a guide plate for guiding the cooling air discharged from the discharging port is provided on the upper side of the discharging port in a posture in which the protruding end faces downward as the distance from the discharging port increases. It is in the point that it is.

According to this characteristic configuration, the cooling air sucked into the engine room by the cooling fan comes into contact with the outer surface of the engine and the outer surface of the exhaust treatment device, and then is discharged from the discharge port. The cooling air discharged in this way is guided downward by coming into contact with the guide plate provided at the discharge port, and is discharged to the outside. By providing the guide plate in this way, even if the outer wall of the mission case is arranged outside the discharge port, the cooling air is sent downward without being obstructed by the outer wall or the like, and the engine room. It does not reduce the flow velocity of the cooling air that comes into contact with the outer surface of the exhaust treatment device inside.
Therefore, a working machine capable of satisfactorily cooling the exhaust treatment device without expanding the engine room was constructed. In particular, in this configuration, for example, the phenomenon that scattered substances such as fine leaves and stems cut during harvesting adhere to the outer surface of the scattered exhaust treatment device is also suppressed.

As a configuration in addition to the above configuration, a plurality of the discharge ports may be provided in a state of being arranged vertically, and the guide plate may be provided for each of the discharge ports.

According to this, the cooling air discharged from each of the plurality of discharge ports arranged vertically is guided downward by the guide plate provided for each discharge, so that the flow velocity of the cooling air discharged from the plurality of discharge ports It is possible to send out without lowering.

As a configuration in addition to the above configuration, a part of the exhaust treatment device may enter below the guide plate.

According to this, since the guide plate and the exhaust treatment device overlap each other in a plan view, the cooling air guided by the guide plate is flowed near the outer periphery of the exhaust treatment device to make the exhaust treatment device more efficient. Allows cooling. In addition, since the overlapping position ventilation is provided in this way, it is possible to reduce the size of the airframe in the direction in which the cooling air flows.

As a configuration in addition to the above configuration, a transport device for transporting the harvested material harvested at the harvesting section in the front part of the machine body upward and rearward is provided, and the engine is arranged below the rear part of the transport device, and the transport device is provided. The lower surface of the rear portion may be provided with a blower for supplying the selected wind to the harvested product transported by the transfer device, and the exhaust treatment device may be arranged below the blower and above the engine.

According to this, the lower surface of the blower is used as a part of the upper wall of the engine room by arranging the exhaust treatment device above the engine below the blower case provided on the lower surface of the rear part of the transport device. For example, as compared with the configuration in which the upper wall of the engine room is arranged under the blower portion, it is possible to suppress the increase in size of the engine room.

As a configuration in addition to the above configuration, the guide plate may be supported by the case of the transport device.

According to this, since the transport device is arranged above the engine, it is not necessary to specially provide a frame, a bracket, or the like for supporting the guide plate by supporting the guide plate in the case of the transport device.

As a configuration in addition to the above configuration, a drive case accommodating an endless rotating band that transmits a driving force to the blower portion is arranged at a position outside the discharge port of the engine room, and the vertical wall of the drive case is said. The guide plate may be arranged between the vertical wall and the discharge port so as to face the discharge port, and a gap may be formed between the guide plate and the vertical wall.

According to this, for example, even if the transmission case is arranged at a position close to the outside of the discharge port of the engine room, since the guide plate is provided between the vertical wall of the transmission case and the discharge port, the guide plate is lowered. The cooling air guided by the above can be discharged outward from the lower end of the vertical wall of the transmission case. Further, the cooling air flowing downward along the inner surface of the vertical wall can pass through the gap between the vertical wall and the guide plate, and the flow is not suppressed by the guide plate.

As a configuration added to the above configuration, the guide plate may be formed with a notch portion through which the endless rotating band passes.

According to this, since a part of the guide member enters a part of the space where the endless rotating band arranged inside the transmission case is arranged, the guide member is not miniaturized. The cooling air can be guided on a large surface.

It is a side view of a corn harvester. It is a top view of a corn harvester. It is sectional drawing which shows the engine room. It is a side view which shows the arrangement of a transport device and a drive case. It is a perspective view which shows the drive case and a guide plate. FIG. 5 is a sectional view taken along line VI-VI of FIG. FIG. 5 is a sectional view taken along line VII-VII of FIG. It is sectional drawing which shows the positional relationship between a guide plate and an exhaust treatment apparatus.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 shows the side surface of the corn harvester A as a working machine, FIG. 2 shows the plane of the corn harvester A, and the arrow F shown in these figures is “front” and the arrow B is “rear”. , The arrow L is "left" and the arrow R is "right". In the following description, the front-back direction and the left-right direction are similar to this.

〔overall structure〕
As shown in FIGS. 1 and 2, the corn harvester A is provided with an engine 4 on an airframe 3 capable of traveling with a pair of left and right front wheels 1 and a pair of left and right rear wheels 2, and a driving unit at the front end of the airframe 3. 5 is arranged, and the harvesting portion 6 is supported at the front end of the machine body 3. The machine body 3 is provided with a transport device 7 for transporting the corn tufts harvested by the harvesting unit 6 to the rear and upper part of the machine body 3, and a bract for removing bracts from the corn tufts transported by the transport device 7 in the center of the machine body 3. A leaf removing portion 8 is provided, and a storage tank 9 is provided at the rear end of the machine body 3. Further, a chopper-type culm processing unit 10 is provided between the front wheels 1 and the rear wheels 2 at the lower part of the machine body 3. A diesel engine is used as the engine 4.

The transport device 7 has a structure in which a conveyor is provided inside a cylindrical case having a linear shape and a rectangular cross-sectional shape, and a blower portion 11 for supplying sorting air to the rear end portion of the transport device 7 is a rear portion of the transport device 7. It is provided on the underside of the. Further, a duct 12 for discharging leaf and stem debris blown off by the sorting wind is provided in a region extending laterally from the terminal portion of the transport device 7.

When the harvesting operation is performed by the corn harvester A, the harvesting unit 6 separates and harvests the corn tufts from the stem to be planted so as to pull out the corn tufts, and the harvested corn tufts are transported to the transport device 7. Is supplied to the corn leaf removing unit 8. In the bract removing section 8, the bracts of the corn tufts are removed and collected in the storage tank 9.

During the harvesting operation, leaf and stem fragments are generated, and these are transported by the transport device 7 in a state of being mixed with the corn tufts. In order to blow off the leaf and stem fragments transported in this way, a blower portion 11 is provided at the rear end of the transport device 7, and the blown leaf and stem strips are discharged to the outside through the duct 12. Further, at the time of harvesting work, the stem portion left in the field is shredded by the residual culm processing portion 10 and diffused to the ground.

〔engine room〕
As shown in FIGS. 1 to 4, the engine 4 is housed in the engine room S with the crankshaft in a posture along the left-right direction of the body 3. The engine room S is formed in a region extending from the outer end side on the right side of the airframe 3 to near the center of the airframe 3, and the opening portion of the engine room S at the inner end near the center of the airframe 3 is the cooling air discharge port Se. Become. As shown in FIGS. 3 and 8, two outlets Se are formed so as to be arranged vertically. Further, the airframe 3 is configured by connecting an airframe frame in a posture along the front-rear direction and an airframe frame along the left-right direction in a grid pattern in a plan view, and a gap portion of the frame is a part of air in the engine room S. Can be distributed.

The engine room S is configured as a space surrounded by a front wall 15, a rear wall 16, and an upper wall 17. As shown in FIGS. 3 and 4, the rear portion of the transport device 7 is arranged above the inner end side of the engine room S.

Further, a part of the transport device 7 and a blower portion 11 provided on the lower surface of the rear portion of the transport device 7 are arranged at positions where they enter the engine room S. That is, a part of the front wall 15, the rear wall 16, and the upper wall 17 is cut out so as not to interfere with the transport device 7.

As shown in FIGS. 1 to 3, a dustproof case 18 is provided at the right outer end of the front wall 15, the rear wall 16, and the upper wall 17 forming the engine room S. As shown in FIG. 3, a radiator 19 is provided inside the body 3 of the dustproof case 18 (on the left side in FIG. 3), and a shroud 20 and a cooling fan 21 are provided inside the body from the radiator 19. A dustproof net 18a is stretched on the outer surface of the dustproof case 18. The cooling fan 21 is driven by the hydraulic motor 21M.

As shown in FIGS. 3 and 4, the exhaust treatment device 25 has a columnar shape as a whole, and in a posture in which the axis direction is set in the front-rear direction of the machine body 3, the cooling air flows to the downstream side of the engine 4. Have been placed. Further, the exhaust treatment device 25 is arranged below the blower case 11a of the blower portion 11 and above the engine 4. Since the position of the exhaust treatment device 25 arranged in this way is higher than the upper end portion of the engine 4, it is possible to directly make the cooling air from the cooling fan 21. Moreover, since the blower case 11a is arranged in the vicinity above the exhaust treatment device 25, the cooling air is guided to the exhaust treatment device 25 in the form of being guided to the lower surface of the blower case 11a, and as a result. , The cooling efficiency of the exhaust treatment device 25 is improved.

That is, the outside air sucked through the dustproof case 18 by the driving rotation of the cooling fan 21 is supplied to the radiator 19 as cooling air, and the cooling water of the engine 4 can be dissipated. Further, the cooling air that has passed through the radiator 19 comes into contact with the outer surfaces of the engine 4 and the exhaust treatment device 25 to cool the engine, and is discharged to the outside from the discharge port Se. The guide plate 40 shown in FIGS. 3 to 5 is provided in order to promote the discharge of the cooling air from the discharge port Se. The guide plate 40 will be described later.

The exhaust treatment device 25 functions as a DPF (Diesel particulate filter) that reduces particulate matter contained in the exhaust gas. The exhaust treatment device 25 is not limited to the DPF, and SCR (Selective catalytic reduction), DOC (Diesel Oxidation Catalyst), or the like can be used, and these can be used in combination.

As shown in FIG. 3, the exhaust treatment device 25 is supplied with exhaust gas from the engine 4 via the upstream exhaust pipe 26. Further, the exhaust gas processed by the exhaust treatment device 25 is discharged to the outside through the downstream exhaust pipe 27.

In particular, the downstream exhaust pipe 27 is composed of three pipes, a first pipe 27a, a second pipe 27b, and a third pipe 27c, between the end of the first pipe 27a and the tip of the second pipe 27b, and , The ejector portion E is provided at the end of the second pipe 27b and the tip of the third pipe 27c. The downstream exhaust pipe 27 is housed in the engine room S except for the terminal portion of the third pipe 27c.

In the ejector portion E, an enlarged diameter portion 27x is formed at the tip of the second pipe 27b and the tip of the third pipe 27c so that the diameter becomes larger toward the upstream side in the direction in which the exhaust gas flows, and the end of the first pipe 27a. And, the end of the second pipe 27b forms a diameter-reduced portion 27y whose diameter becomes smaller toward the downstream side in the direction in which the exhaust gas flows. That is, a configuration in which the diameter of the end of the first pipe 27a and the end of the second pipe 27b is not reduced leads to an increase in the diameter of the entire pipeline, but by forming the reduced diameter portion 27y in this way, it is downstream. The overall diameter of the side exhaust pipe 27 is suppressed from increasing.

As shown in FIGS. 1 and 2, a pre-cleaner 28 outside the engine room S, a strut-shaped external intake pipe 29 communicating with the pre-cleaner 28, and a main air cleaner 30 communicating with the lower end of the external intake pipe 29. The internal intake pipe 31 connecting the main air cleaner 30 and the engine 4 is provided at a position to be inserted into the front wall 15, and outside air is supplied to the engine 4 from the internal intake pipe 31.

[Blower and guide body]
As shown in FIG. 3, the blower portion 11 includes a wall insert 11c that rotates integrally with the blower drive shaft 11b in a sideways posture inside the blower case 11a. By arranging the blower case 11a so as to fit into the space formed on the inner end side of the upper wall 17 of the engine room S, the blower case 11a is arranged at a position covering the upper part of the engine room S. .. Further, the exhaust treatment device 25 described above is arranged below the blower case 11a of the blower portion 11.

The conveyor device 7 exposes a conveyor drive shaft (not shown) for driving an internal conveyor on the left side surface at the rear end. As shown in FIG. 3, a drive unit cover 33 is provided on the left side surface of the rear end of the transport device 7, and a drive case 34 is provided on the lower side of the drive unit cover 33. Further, a triangular auxiliary drive case 34a is provided on the front side of the drive case 34 so as to be connected to the transfer device 7.

As shown in FIG. 3, a blower pulley 11p is provided at the end of the blower drive shaft 11b, and an endless rotation band extends over the blower pulley 11p and an output pulley (not shown) that is driven and rotated by the driving force of the engine 4. The drive belt 35 is wound around. A part of the drive belt 35 is housed in the drive case 34. Although not shown in the drawing, a transmission system for transmitting the driving force from the drive belt 35 to the transport drive shaft (not shown) is provided at a position covered by the drive unit cover 33.

As shown in FIGS. 3 to 8, the drive case 34 has a flat vertical wall 34W, and bent portions 34T protruding from both front and rear ends of the vertical wall 34W to the right side of the machine body are formed. In addition, in FIGS. 5 and 7, the auxiliary drive case 34a is also designated by the vertical wall 34W and the bent portion 34T.

As shown in FIG. 4, in the side view, the lower end positions of the drive case 34 and the auxiliary drive case 34a are set so that the lower ends of the drive case 34 and the auxiliary drive case 34a overlap with the exhaust treatment device 25. There is. As a result, the cooling air discharged from the discharge port Se can be discharged to the outside from the lower end positions of the drive case 34 and the auxiliary drive case 34a.

In this configuration, since the vertical wall 34W of the drive case 34 and the auxiliary drive case 34a is arranged at a position that blocks the cooling air, the cooling air is smoothly discharged from the engine room S. A pair of guide plates 40 for guiding the cooling air discharged from the discharge port Se downward are provided on the inner surface (the surface facing the engine room S) of the vertical wall 34W.

As shown in FIGS. 3 and 8, the corn harvester A has a structure in which two discharge ports Se are provided in a state of being arranged vertically, and guide plates 40 are provided in each of the upper and lower discharge ports Se. ing.

As shown in FIGS. 5 and 7, a main bracket 41 is integrally formed on the lower guide plate 40 of the pair of guide plates 40, and the end portion of the main bracket 41 is bent to form the main bracket 41. The fixed piece 41a is connected to the lower surface of the case of the transport device 7. Further, as shown in FIGS. 5 and 6, a sub bracket 42 is integrally formed on the upper guide plate 40 of the main pair of guide plates 40, and the sub bracket 42 is mounted on the side surface of the case of the transport device 7. It is connected.

As shown in FIGS. 3 and 8, the positional relationship is set so that a part of the exhaust treatment device 25 enters below the lower guide plate 40. As a result, the cooling air guided by the guide plate 40 flows along the outer circumference of the exhaust treatment device 25, and efficient cooling of the exhaust treatment device 25 is realized. Further, this configuration also leads to miniaturization of the engine room S in the left-right direction of the airframe 3.

By being supported by the transport device 7 in this way, each of the guide plates 40 is set to an oblique posture toward the outside from the discharge port Se toward the lower side (oblique posture when viewed in the front-rear direction), and is discharged from the discharge port Se. The cooling air to be generated can be guided downward. The guide plate 40 may be configured to support the inner surface of the drive case 34.

The area where the lower guide plate 40 receives the cooling air is set to be larger than the area where the upper guide plate 40 receives the cooling air. Further, as shown in FIG. 8, the pair of guide plates 40 are arranged in a positional relationship in which they are separated by a predetermined interval M in the vertical direction. Further, as shown in FIGS. 6 to 8, a gap G is formed between each protruding end of the pair of guide plates 40 and the inner surface (the surface facing the engine room S) of the vertical wall 34W of the drive case 34. ing. By forming the gap G in this way, it is configured so as not to suppress the flow of the cooling air downward along the inner surface of the vertical wall 34W.

As described above, the drive belt 35 is arranged inside the drive case 34, and in order to avoid interference between the drive belt 35 and the lower guide plate 40, the lower guide plate 40 is used as shown in FIG. Is formed with a notch 40a through which the drive belt 35 passes. Further, as shown in FIG. 5, a guide body 43 guided by the drive belt 35 is attached to the inner surface of the vertical wall 34W.

[Action and effect of the embodiment]
From this configuration, the cooling air sucked into the engine room S from the outside by the cooling fan 21 comes into contact with the outer surface of the engine 4 and the outer surface of the exhaust treatment device 25 to cool the engine, and then the discharge port of the engine room S. It is discharged from Se in the direction of the drive case 34. The cooling air discharged in this way is guided downward by coming into contact with the pair of guide plates 40, and is discharged to the outside from the lower end of the drive case 34. As a result, the flow velocity of the cooling air flowing through the engine room S is not reduced, and the cooling effect on the engine 4 and the exhaust treatment device 25 is not reduced.

The cooling fan 21 is arranged at a high position in the engine room S, and the cooling air supplied from the cooling fan 21 can be brought into direct contact with the exhaust treatment device 25, so that good cooling is possible.

By arranging the two guide plates 40 at predetermined intervals M above and below, the efficiency of guiding the cooling air is improved, and the flow velocity of the cooling air inside the engine room S is maintained high. For example, the upper guide plate 40 The inconvenience of disturbing the air flow can be suppressed by the cooling air guided downward in contact with the lower guide plate 40. Further, since the gap G is formed between the guide plate 40 and the inner surface of the vertical wall 34W of the drive case 34, the gap G is cooled when the cooling air flows downward along the inner surface of the vertical wall 34W. The wind will pass through, and the guide plate 40 will not block the flow of the cooling air.

Since the engine room S is fitted into the transport device 7 on the upper side of the inner end portion near the center of the machine body 3, a part of the transport device 7 and a case portion of the blower portion 11 provided on the lower surface of the transport device 7. It is possible to form a part of the above as the inner wall of the engine room S, and for example, the plate material used as the front wall 15 and the upper wall 17 of the engine room S can be miniaturized.

By arranging a part of the exhaust treatment device 25 so as to overlap the lower side of the lower guide plate 40, the cooling air guided by the guide plate 40 flows along the outer circumference of the exhaust treatment device 25 and is exhausted. The processing device 25 can be cooled efficiently. Further, since the exhaust treatment device 25 is arranged below the blower case 11a, the blower case 11a can be used as a case for covering the upper part of the engine room S.

Further, since the cutout portion 40a is formed in the lower guide plate 40, it is not necessary to arrange the guide plate 40 at a position avoiding the drive belt 35 arranged inside the drive case 34. Further, since the guide body 43 is formed in the drive case 34, the guide body 43 can regulate the vibration when the drive belt 35 vibrates.

[Another Embodiment]
The present invention may be configured as follows in addition to the above-described embodiment (those having the same functions as those in the embodiment are designated by the same number and reference numeral as those in the embodiment).

(A) The present invention is not limited to the work machine in which the drive case 34 is arranged outside the discharge port Se of the engine room S, for example, a mission case, a threshing device, or a work machine in which a grain tank is arranged. In, a guide plate 40 can be provided to guide the cooling air discharged from the discharge port Se downward.

(B) The discharge port Se may be single or may be formed in three or more. Therefore, one or three or more guide plates 40 may be provided. Further, it is possible to provide a plurality of guide plates 40 for one discharge port Se, and the shape and size of the guide plates 40 may be arbitrarily set.

(C) As a member for forming the engine room S, a simple wall body may be used without using the transport device 7 or the blower portion 11.

(D) A dedicated cooling fan 21 may be used to supply cooling air to the engine room S, or the cooling fan 21 may be used in combination with the cooling fan 21 for cooling the radiator 19.

The present invention can be used for a working machine that performs work by the driving force of an engine.

4 Engine 6 Harvesting part 7 Conveying device 11 Blower part 11a Blower part Case 21 Cooling fan 25 Exhaust processing device 34 Drive case 34W Vertical wall 35 Drive belt (endless rotation band)
40 Guide plate 40a Notch G Gap S Engine room Se Outlet

Claims (7)

With the engine
A cooling fan that cools the engine,
An engine room in which cooling air is supplied from one end side to the inside by the cooling fan and the engine is arranged inside.
An exhaust treatment device arranged above the engine in the engine room to purify the exhaust gas of the engine.
An outlet for discharging cooling air is formed in the other end side of the engine room, which is opposite to the cooling fan.
A working machine provided with a guide plate on the upper side of the discharge port for guiding the cooling air discharged from the discharge port in a posture in which the protruding end faces downward as the position becomes farther from the discharge port. The work machine according to claim 1, wherein a plurality of the discharge ports are provided vertically, and the guide plate is provided for each of the discharge ports. The working machine according to claim 1 or 2, wherein a part of the exhaust treatment device is inserted below the guide plate. It is equipped with a transport device that transports the harvested products harvested at the harvesting section at the front of the aircraft upward and backward.
The engine is located below the rear of the transport device.
On the lower surface of the rear portion of the transport device, a blower section for supplying sorting air to the harvested products transported by the transport device is provided.
The work machine according to any one of claims 1 to 3, wherein the exhaust treatment device is arranged below the blower portion and above the engine. The working machine according to claim 4, wherein the guide plate is supported by a case of the transport device. A drive case accommodating an endless rotating band that transmits a driving force to the blower portion is arranged at a position outside the discharge port of the engine room.
The vertical wall of the drive case faces the outlet,
The working machine according to claim 4 or 5, wherein the guide plate is arranged between the vertical wall and the discharge port, and a gap is formed between the guide plate and the vertical wall. The working machine according to claim 6, wherein a cutout portion through which the endless rotating band passes is formed in the guide plate.

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