JP2016188549A - Working machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a working machine capable of satisfactorily mounting an engine control unit.SOLUTION: The working machine includes: a machine body; an engine which is mounted in a rear part of the machine body; a radiator which is disposed at the side of the engine; a hydraulic oil tank which is disposed in front of the radiator; an inner cover which covers the hydraulic oil tank at the inner side of the machine body; an outer cover which covers the hydraulic oil tank at the outer side of the machine body; an upper cover which covers the hydraulic oil tank thereabove in an openable/closable manner; and an engine control unit which is disposed between the hydraulic oil tank and the inner cover.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a work machine such as a backhoe.

Conventionally, the technique disclosed in Patent Document 1 is known as a working machine.
The working machine disclosed in Patent Document 1 has a machine body that is supported on a traveling body so as to be rotatable about a vertical axis. An engine is mounted on the rear of the aircraft. A driver's seat is mounted in front of the aircraft engine. Control devices are provided on the right and left sides of the driver's seat. An engine control unit for controlling the engine is provided in front of the right control device.

JP 2014-31688 A

In the conventional working machine, the harness connecting the engine control unit and the engine is routed from the engine control unit to the engine through the driver's seat. However, the space under the driver's seat is narrow, and a hydraulic hose and the like pass through, so there is a problem that the harness cannot be easily passed.
Further, in order to facilitate the wiring of the harness, the engine control unit may be attached to the engine. However, the engine control unit is vulnerable to vibration and is difficult to attach to the engine.

  Then, an object of this invention is to provide the working machine which can mount an engine control unit favorably in view of the said problem.

The technical means taken by the present invention to solve the technical problems are characterized by the following points.
A work machine according to a first aspect of the present invention includes an airframe, an engine mounted on a rear portion of the airframe, a radiator disposed on a side of the engine, and a hydraulic oil tank disposed on a front side of the radiator. An inner cover for covering the inside of the hydraulic oil tank, an outer cover for covering the outer side of the hydraulic oil tank, an upper cover for opening and closing the upper portion of the hydraulic oil tank, the hydraulic oil tank, An engine control unit provided between the inner cover and the inner cover.

The work machine of the invention according to claim 2 includes a cooling fan that is provided between the engine and the radiator and generates cooling air toward the engine.
A cooling passage for flowing air sucked by the cooling fan is provided between the hydraulic oil tank and the engine control unit.
According to a third aspect of the present invention, there is provided a work machine according to a third aspect of the present invention, wherein a first slope that is inclined rearward toward the machine body is provided on the rear surface of the engine control unit on the surface of the hydraulic oil tank.

According to a fourth aspect of the present invention, there is provided a second slope which is a rear portion of the hydraulic oil tank and is inclined to the outer side of the machine body toward the rear side on the surface on the engine control unit side.
In the working machine of the invention according to claim 5, the engine control unit is attached to the hydraulic oil tank.

The working machine according to the present invention includes an engine, a radiator disposed on the side of the engine, and a hydraulic oil tank disposed on the front side of the radiator, the hydraulic oil tank, and the hydraulic oil tank An engine control unit is provided between the inner cover that covers the inside of the aircraft.
That is, a gap in which the engine control unit can be arranged is provided between the hydraulic oil tank and the inner cover, and the engine control unit is arranged in this gap. Therefore, it is possible to secure an installation place of the engine control unit in a place where the wiring of the harness from the engine control unit to the engine can be easily performed. Further, the space between the hydraulic oil tank and the inner cover can be effectively used. In addition, since the space between the hydraulic oil tank and the inner cover is less susceptible to the vibration of the fuselage compared to the case where the engine control unit is installed in the engine, vibration transmission to the engine control unit can be suppressed. it can.

Further, by providing a cooling passage for flowing air sucked by the cooling fan between the hydraulic oil tank and the engine control unit, the engine control unit is cooled by effectively using the air flow generated by the cooling fan. be able to.
In addition, a first slope that is rearward of the engine control unit and is inclined rearward toward the body side is provided on the surface of the hydraulic oil tank. By this first inclined surface, the flow of the airflow flowing between the hydraulic oil tank and the engine control unit becomes smooth, and the engine control unit can be efficiently cooled.

In addition, a second inclined surface that is inclined toward the rear side of the machine body is provided on the surface on the engine control unit side, which is the rear portion of the hydraulic oil tank. By this second inclined surface, the flow of airflow flowing between the hydraulic oil tank and the engine control unit becomes smooth, and the engine control unit can be efficiently cooled.
Further, by attaching the engine control unit to the hydraulic oil tank, the engine control unit can be attached before the inner cover is attached. As a result, the engine control unit can be mounted in a wide work space, and the engine control unit can be easily mounted.

It is a plane sectional view of an installation part of an engine control unit. It is a right view of an airframe. It is a top view of an airframe. It is a right view inside an airframe. It is a front view inside an airframe. It is a top view inside an airframe. It is a perspective view of the installation part of an engine control unit. It is a disassembled perspective view of an engine control unit. It is a side view of a working machine. It is a front view of a working machine.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
9 and 10 are schematic views showing the overall configuration of a working machine (swivel working machine) 1 according to the present invention, and an ultra-small turning type backhoe is illustrated.
The work machine 1 includes a machine body (swivel base) 2, a cabin 3, a travel device 4, and a work device 5.

  Hereinafter, the front side (left side in FIG. 9) of the driver seated in the driver's seat 7 of the cabin 3 is forward, the rear side (right side in FIG. 9) is rearward, and the left side of the driver (front side in FIG. 9) is The left side and the right side of the driver (the back side in FIG. 9) are described as the right side. Further, the horizontal direction, which is a direction orthogonal to the front-rear direction K1 (see FIG. 9), will be described as the body width direction (see FIG. 10). In addition, the direction from the central part of the airframe 2 toward the right part or the left part will be described as the outside of the airframe. In other words, the outward direction of the airframe refers to the direction away from the airframe 2 in the width direction of the airframe. The direction opposite to the outside of the aircraft will be described as the inside of the aircraft. In other words, the in-machine direction is the direction of the body width and the direction approaching the body 2.

As shown in FIGS. 9 and 10, the airframe 2 is supported on the frame of the traveling device 4. The body 6 is supported so as to be rotatable about a vertical axis (vertical axis) via a bearing.
A work device 5 is attached to the right front portion of the machine body 6.
The cabin 3 is mounted on the left front part on the body 2. A driver's seat 7 is provided inside the cabin 3.

The traveling device 4 is a crawler-type traveling device, and is provided below the right side and the left side of the body 2. A dozer 29 is provided at the front of the traveling device 4.
The work device 5 includes a first boom 8, a second boom 9, a third boom 10, an arm 11, and a work tool 12. Further, the work device 5 includes a boom cylinder 13, an offset cylinder 14, an offset link 15, an arm cylinder 16, and a work tool cylinder 17 as a drive mechanism (actuator or the like) such as a boom.

The boom cylinder 13, the offset cylinder 14, the arm cylinder 16, and the work tool cylinder 17 are constituted by double-acting hydraulic cylinders.
The base end portion of the first boom 8 is pivotally supported by the body 6 on the right side of the cabin 3. A base end portion of the second boom 9 is pivotally supported at the distal end portion of the first boom 8 so as to be rotatable about the vertical axis. A base end portion of the third boom 10 is pivotally supported at the distal end portion of the second boom 9 so as to be rotatable around the vertical axis. A base end portion of the arm 11 is pivotally supported at the distal end portion of the third boom 10 so as to be rotatable about a horizontal axis (axis in the body width direction). A work tool 12 is attached to the tip of the arm 11. In this embodiment, the bucket 12 is mounted as a work tool. However, instead of or in addition to the bucket 12, another work tool (hereinafter referred to as another work tool) can be mounted. . Examples of other work tools include a hydraulic breaker, a hydraulic crusher, an angle bloom, an earth auger, a pallet fork, a sweeper, a mower, and a snow blower.

The base end portion of the boom cylinder 13 is pivotally supported by the airframe 6 on the right side of the cabin 3. The tip of the boom cylinder 13 is pivotally supported near the tip of the first boom 8. The first boom 8 swings up and down by the expansion and contraction of the boom cylinder 13.
An offset cylinder 14 is provided between the first boom 8 and the second boom 9. The tip end portion of the offset cylinder 14 is pivotally supported by a midway portion in the longitudinal direction of the second boom 9. The base end portion of the offset cylinder 14 is pivotally supported on one side surface (left side surface) of the distal end portion of the first boom 8. The second boom 9 swings in the body width direction due to the expansion and contraction of the offset cylinder 14.

An offset link 15 is provided between the first boom 8 and the third boom 10. One end of the offset link 15 is pivotally supported on one side surface (left side surface) of the third boom 10. The other end portion of the offset link 15 is pivotally supported on one side surface (left side surface) of the distal end portion of the first boom 8.
The offset link 15 is disposed substantially parallel to the second boom 9. The offset cylinder 14 and the offset link 15 are disposed on one side (left side) of the second boom 9. The third boom 10 swings in the width direction of the machine body due to the expansion and contraction of the offset cylinder 14.

An arm cylinder 16 is provided between the third boom 10 and the arm 11. As the arm cylinder 16 expands and contracts, the arm 11 swings up and down.
A work tool cylinder 17 is provided between the arm 11 and the bucket 12. As the work tool cylinder 17 extends and contracts, the bucket 12 performs a squeeze operation and a dump operation.
The machine body 6 includes a swivel board 24, a protector (counterweight) 25, and a swivel cover 26.

The swivel board 24 is formed from a metal thick plate and constitutes the bottom of the machine body 6. The swivel board 24 is supported on the frame of the traveling device 4 so as to be rotatable around a vertical axis via a bearing.
The protector 25 is attached to the rear part of the turning substrate 24. The protector 25 constitutes the rear part of the machine body 6 and has a function of a balance weight for balancing the weight with the work device 5.

The swivel cover 7 is fixed to the swivel substrate 24. As shown in FIGS. 2, 9, and 10, the turning cover 26 has a left side portion 26a, a right side portion 26b, a left front portion 26c, and a right front portion 26d. The left side portion 26 a and the right side portion 26 b constitute the side surface of the body 6. Left front part 26c
The right front part 26d constitutes the front surface of the body 6.
As shown in FIG. 3, devices such as an engine 32, a hydraulic oil tank 31, a valve unit 18, an engine control unit 27, a radiator 34, an oil cooler 36, and a hydraulic pump 35 are mounted on the turning substrate 24.

  The engine 32 is configured by a common rail type diesel engine. The hydraulic oil tank 31 is a tank that stores hydraulic oil for operating hydraulic equipment (hydraulic cylinder, hydraulic motor, etc.) installed in the work machine 1. The valve unit 18 is a unit formed by collecting control valves that control the hydraulic equipment installed in the work machine 1. The engine control unit 27 is a device that controls the engine 32. The engine control unit 27 is connected to the engine 32 via a harness. The radiator 34 is a device that radiates heat from the cooling water of the engine 32. The oil cooler 36 is a device that radiates the heat of the hydraulic oil. The hydraulic pump 35 is a pump that sucks the hydraulic oil in the hydraulic oil tank 31 and sends it to the valve unit 18 as pressure oil.

The engine 32 is arranged at the rear part on the turning board 24. Further, the engine 32 is disposed horizontally so that the crankshaft substantially coincides with the body width direction. A hydraulic pump 35 is disposed on the left side of the engine 32. The hydraulic pump 35 is driven by the engine 32.
The radiator 34, the oil cooler 36, the hydraulic oil tank 31, the engine control unit 27, and the valve unit 18 are provided on the right part on the turning substrate 24.

The radiator 34 is disposed on the right side of the engine 32. A cooling fan 33 is provided between the engine 32 and the radiator 34.
As shown in FIG. 6, the arrangement portion of the radiator 32 and the arrangement portion of the engine 32 are partitioned by a shroud 40, a partition member 41, and the like. In the shroud 40, an opening 42 is formed at a portion corresponding to the core of the radiator 34, and the cooling fan 33 is disposed in the opening 42. The cooling fan 33 is driven by the engine 32. Further, the cooling fan 33 generates cooling air toward the engine 32. Therefore, the cooling fan 33 sucks air on the right side of the radiator 34 and blows it to the engine 32 side. An oil cooler 36 is disposed on the right side of the radiator 34.

  The engine control unit 27, the hydraulic oil tank 31, and the valve unit 18 are disposed on the front side of the radiator 34 and the oil cooler 36. There is no partition between the arrangement part of the radiator 34 and the oil cooler 36 and the arrangement part of the engine control unit 27 and the hydraulic oil tank 31. In other words, the arrangement part of the radiator 34 and the oil cooler 36 and the arrangement part of the engine control unit 27 and the hydraulic oil tank 31 communicate with each other.

The engine control unit 27 is disposed in front of the radiator 34. The hydraulic oil tank 31 is disposed on the right side of the engine control unit 27. The valve unit 18 is disposed in front of the hydraulic oil tank 31.
As shown in FIG. 3, a rear cover 28 is provided on the rear portion of the body 6. The rear cover 28 is disposed above the protector 25 and covers the engine 32, the cooling fan 33, and the hydraulic pump 35. The rear cover 28 includes a front cover 28a, a bonnet cover 28b, and a left side cover 28c. The front cover 28 a is disposed behind and to the left of the driver's seat 7 and covers the front and top of the engine 32. The bonnet cover 28 b covers the rear of the engine 32. The bonnet cover 28b has a left end supported on a frame member attached to the turning board 24 so as to be swingable about a vertical axis via a hinge. The left side cover 28 c covers the left side of the engine 32.

As shown in FIGS. 2, 3, and 6, a side cover (cover body) 30 is provided on the right side of the machine body 6. The side cover 30 covers the radiator 34, the oil cooler 36, the hydraulic oil tank 31, the engine control unit 27, and the valve unit 18.
As shown in FIG. 3, a support portion 80 that supports the first boom 8 is provided between the cabin 3 and the side cover 30. The support portion 80 includes a pair of vertical plates 81R and 81L and a bottom plate 82. The vertical plates 81R and 81L are composed of a right vertical plate 81R and a left vertical plate 81L. The right vertical plate 81R and the left vertical plate 81L are provided vertically on the revolving substrate 24, and are arranged to face each other so that the plate surfaces face the body width direction. The right vertical plate 81 </ b> R and the left vertical plate 81 </ b> L are fixed by welding on the turning substrate 24.

A pivot 84 that supports the base end portion of the first boom 8 is provided between the right vertical plate 81R and the left vertical plate 81L. A cylinder bracket 86 that supports the base end portion of the boom cylinder 13 is provided on the bottom plate 82.
As shown in FIGS. 2, 3, 5, and 6, the side cover 30 includes an inner cover 46, an outer cover 47, and an upper cover 48. The inner cover 46 covers the inside (left side) of the hydraulic oil tank 31, the engine control unit 27, and the valve unit 18. The outer cover 47 covers the outside (right side) of the radiator 34, the oil cooler 36, the hydraulic oil tank 31, the engine control unit 27, and the valve unit 18. The upper cover 48 covers the radiator 34, the oil cooler 36, the hydraulic oil tank 31, the engine control unit 27, the valve unit 18 and the front of the valve unit 18.

  As shown in FIG. 4, the inner cover 46 is disposed above the right vertical plate 81 </ b> R and on the front side of the radiator 34. The upper edge and the front edge of the inner cover 46 are bent toward the outside of the body (see FIG. 5). As shown in FIGS. 1 and 4, a reinforcing plate 91 is provided at the rear end of the inner cover 46. The reinforcing plate 91 extends toward the outside of the machine body and is provided along the rear end of the inner cover 46.

  As shown in FIG. 4, the inner cover 46 is fixed to the right vertical plate 81 </ b> R and the turning substrate 24 by the first support member 49 and the second support member 50. The first support member 49 is disposed on the right side of the right vertical plate 81 </ b> R and the inner cover 46 (inside the side cover 30) and at the rear of the inner cover 46. The first support member 49 is disposed vertically and is provided across the right vertical plate 81 </ b> R and the inner cover 46. The lower part of the first support member 49 is fixed to the right vertical plate 81R with bolts and nuts. A nut 51 is fixed to the upper part of the right side surface of the first support member 49. A bolt that penetrates the inner cover 46 from the inside (left side) of the machine body is screwed into the nut 51. Accordingly, the inner cover 46 is fixed to the first support member 49.

  The second support member 50 is disposed on the right side of the right vertical plate 81 </ b> R and the inner cover 46 (inside the side cover 30) and in front of the first support member 49. The second support member 50 includes a first member 52 and a second member 53. The first member 52 is formed of a band plate material and is disposed sideways along the front-rear direction. The rear part of the first member 52 is fixed to the right vertical plate 81R with bolts and nuts. The front portion of the first member 52 is located on the side of the inner cover 46. A nut 54 is fixed to the right side surface of the front portion of the first member 52. The nut 54 is screwed with a bolt that penetrates the inner cover 46 from the body side (left side). As a result, the inner cover 46 is fixed to the first member 52. The second member 53 is formed by bending a pipe material, and one end 53 a is fixed to the rear portion of the first member 52. The middle part 53b of the second member is fixed to the front part of the first member. The other end 53c of the second member 53 is fixed to a mounting base 55 fixed to the turning board. A nut 56 is fixed to the other end side of the second member 53. A bolt that penetrates the inner cover 46 from the inside (left side) of the machine body is screwed into the nut 56. As a result, the inner cover 46 is fixed to the second member 53.

From the above, the inner cover 46 is attached to the first support member 49 and the second support member 50 from the body side (left side).
As shown in FIG. 2, the outer cover 47 includes a first cover 57 and a second cover 58. The first cover 57 is disposed on the right side of the hydraulic oil tank 31 and the valve unit 18 and above the left side portion 26 a of the swivel cover 26. The second cover 58 is disposed behind the first cover 57 and on the right side of the radiator 34 and the oil cooler 36. A first opening 59 and a second opening 60 are formed in the second cover 58. Outside air is taken into the side cover 30 from the first opening 59 and the second opening 60. A third opening 61 is formed on the right side of the protector 25, and outside air can be taken in through the third opening. The first opening 59, the second opening 60, and the third opening 61 are closed by a reticulated mesh member.

The upper cover 48 is supported by the revolving substrate 24 so that the front and lower portions are rotatable about the horizontal axis. Therefore, the upper cover 48 can be opened and closed with its rear portion swinging up and down.
As shown in FIG. 5, the hydraulic oil tank 31 is vertically arranged on the right side of the right vertical plate 81 </ b> R and the inner cover 46. The bottom of the hydraulic oil tank 31 is fixed to a support base 37 fixed on the revolving substrate 24 by bolts. A gap 62 is provided between the hydraulic oil tank 31 and the inner cover 46. The engine control unit 27 is disposed in the gap 62. In other words, a gap 62 in which the engine control unit 27 can be disposed is provided between the hydraulic oil tank 31 and the inner cover 46.

  As shown in FIG. 1, the left side wall 77 (side wall on the engine control unit 27 side) of the hydraulic oil tank 31 has a front first portion 77a and a rear second portion 77b. The first portion 77 a is a wall portion along the front-rear direction of the body 2. The second portion 77b is an inclined wall that is slightly inclined outward (rightward) toward the rear. A corner wall 79 between the left side wall 77 and the rear wall 78 of the hydraulic oil tank 31 is an inclined wall that is inclined outward (to the right) toward the rear, and has an inclination angle greater than that of the second portion 77b. It is considered as a large inclined wall. Therefore, the outer surface of the corner wall 79 is an inclined surface (second inclined surface 92) that is inclined rearwardly toward the aircraft body. An outer surface of the corner wall 79 is a rear portion of the hydraulic oil tank 31 and is a surface on the engine control unit 27 side. In other words, the outer surface of the corner wall 79 is a surface on the outer side of the hydraulic oil tank 31.

  As shown in FIG. 5, the engine control unit 27 is disposed on the upper side of the hydraulic oil tank 31 so that the upper portion protrudes upward from the hydraulic oil tank 31. Further, as shown in FIG. 4, the engine control unit 27 is disposed on the rear side of the first support member 49. Further, as shown in FIG. 1, the engine control unit 27 is disposed on the left side of the rear portion of the hydraulic oil tank 31. Further, the rear end side of the engine control unit 27 projects rearward from the rear wall 78 of the hydraulic oil tank 31. As shown in FIGS. 5 and 7, the engine control unit 27 is attached to the upper part of the hydraulic oil tank 31. The engine control unit 27 may be attached to the inner cover 46.

  An L-shaped first stay 65 is provided at the upper part of the right side surface (side surface on the hydraulic oil tank 31 side) of the engine control unit 27, and an L-shaped second stay 66 is provided at the lower part of the front surface of the engine control unit 27. Yes. A block-shaped first mounting member 67 is fixed to the upper surface of the hydraulic oil tank 31. An L-shaped second attachment member 68 is fixed to the left side surface (side surface on the engine control unit 27 side) of the hydraulic oil tank 31. A nut member 70 is fixed to the second mounting member 68.

The first stay 65 is placed on the first mounting member 67 and fixed by a bolt 69 that passes through the first stay 65 from above and is screwed to the first mounting member 67. The second stay 66 is placed on the second mounting member 68 and fixed by a bolt 71 that passes through the second stay 66 and the second mounting member 68 from above and is screwed into the nut member 70.
As shown in FIG. 8, the engine control unit 27 includes a unit main body 63 and a case 64. The unit main body 63 is provided with a connector portion 72 at the bottom. A harness for connecting the engine control unit 27 and the engine 32 is connected to the connector portion 72. The engine control unit 27 is accommodated in the case 64. The lower end of the case 64 is open toward the bottom, and the connector portion 72 of the unit main body 63 protrudes from the open portion.

The case 64 includes a case main body 73 and a lid member 74. The case body 73 includes a first wall 73a, a second wall 73b, a third wall 73c, and a fourth wall 73d. The first wall 73a constitutes the left side wall of the engine control unit 27 (case 64). The second wall 73b constitutes the upper wall of the engine control unit 27 (case 64). The third wall 73c constitutes the front wall of the engine control unit 27 (case 64). The fourth wall 73d constitutes the rear wall of the engine control unit 27 (case 64). The unit main body 63 is attached to the first wall 73a. A second stay 66 is fixed to the lower part of the front surface of the third wall 73c. A fixed stay 93 is attached to the lower part of the rear surface of the third wall 73c.

  The lid member 74 includes a fifth wall 74a, a sixth wall 74b, a seventh wall 74c, and an eighth wall 74d. The fifth wall 74a constitutes the right side wall of the engine control unit 27 (case 64). The sixth wall 74b constitutes the upper wall of the engine control unit 27 (case 64). The seventh wall 74c constitutes a corner portion between the right side wall and the rear wall of the engine control unit 27 (case 64). The eighth wall 74d constitutes the rear wall of the engine control unit 27 (case 64). The fifth wall 74 a is attached to the fixed stay 93. The sixth wall 74b is overlapped with the upper surface of the third wall 73c and fixed to the third wall 73c. The eighth wall 74d is overlapped with the rear surface of the fourth wall 73d and fixed to the fourth wall 73d.

  As shown in FIG. 1, the engine control unit 27 is attached so as to incline outward from the aircraft toward the rear. Further, the fifth wall 74 a of the engine control unit 27 faces the second portion 77 b of the hydraulic oil tank 31. A gap is provided between the fifth wall 74a and the second portion 77b. This gap serves as a cooling passage 94 for flowing air sucked by the cooling fan 33. In other words, a cooling passage 94 for flowing air sucked by the cooling fan 33 is provided between the hydraulic oil tank 31 and the engine control unit 27.

  Further, the seventh wall 74c is inclined toward the rear (left side) toward the rear. Therefore, the outer surface of the seventh wall 74c is an inclined surface (first inclined surface 75) that is inclined rearward toward the aircraft body. The outer surface of the seventh wall 74 c is a rear portion of the engine control unit 27 and is a surface on the hydraulic oil tank 31 side, in other words, a surface on the outer side of the case 64. In addition, the first slope 75 is displaced rearward from the second slope 92.

  In the working machine 1 having the above configuration, a gap 62 in which the engine control unit 27 can be disposed is provided between the hydraulic oil tank 31 and the inner cover 46, and the engine control unit 27 is provided in the gap 62. Thereby, the installation place of the engine control unit 27 can be secured in a place where the wiring of the harness from the engine control unit 27 to the engine can be easily performed. Further, the space between the hydraulic oil tank 31 and the inner cover 46 can be used effectively. Further, the space between the hydraulic oil tank 31 and the inner cover 46 is a place where the engine control unit 27 is less susceptible to the vibration of the airframe 2 than the case where the engine control unit 27 is provided in the engine 32. Transmission can be suppressed.

Further, by providing a cooling passage 94 for flowing the air sucked by the cooling fan 33 between the hydraulic oil tank 31 and the engine control unit 27, the airflow 95 generated by the intake air of the cooling fan 33 can be effectively used. The control unit 27 can be cooled.
In addition, a first slope 75 is provided on the surface of the hydraulic oil tank 31 side, which is a rear portion of the engine control unit 27, and is inclined rearwardly toward the body. Since the first inclined surface 75 smoothens the flow of airflow between the hydraulic oil tank 31 and the engine control unit, the engine control unit 27 can be efficiently cooled (providing the first inclined surface 75). Thus, separation of the airflow flowing along the surface of the engine control unit 27 on the hydraulic oil tank 31 side can be prevented.)

In addition, a second slope 92 is provided at the rear of the hydraulic oil tank 31 and on the surface of the engine control unit 27 so as to incline toward the rear of the machine body.
As a result, the airflow smoothly flows between the hydraulic oil tank and the engine control unit, and the engine control unit can be cooled efficiently (by providing the second inclined surface 92, the engine control unit 27 of the hydraulic oil tank 31 is provided. The separation of the airflow flowing along the side surface can be prevented.)

Further, by attaching the engine control unit 27 to the hydraulic oil tank 31, the engine control unit 27 can be attached before the inner cover 46 is attached. As a result, the engine control unit 27 can be mounted in a wide working space, and the engine control unit 27 can be easily mounted.
Although the present invention has been described above, it should be understood that the embodiments disclosed herein are illustrative and non-restrictive in every respect. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

2 Airframe 27 Engine control unit 32 Engine 33 Cooling fan 34 Radiator 31 Hydraulic oil tank 46 Inner cover 47 Outer cover 48 Upper cover 75 First slope 92 Second slope 94 Cooling passage

Claims (5)

The aircraft,
An engine mounted on the rear of the aircraft;
A radiator disposed on a side of the engine;
A hydraulic oil tank disposed on the front side of the radiator;
An inner cover that covers the inside of the hydraulic oil tank;
An outer cover that covers the outside of the machine body of the hydraulic oil tank;
An upper cover covering the hydraulic oil tank so as to be openable and closable;
An engine control unit disposed between the hydraulic oil tank and the inner cover;
Work machine equipped with. A cooling fan provided between the engine and the radiator to generate cooling air toward the engine;
The work machine according to claim 1, wherein a cooling passage is provided between the hydraulic oil tank and the engine control unit for flowing air sucked by the cooling fan.   The working machine according to claim 2, wherein a first slope that is rearward of the engine control unit and is inclined rearward toward the body is provided on a surface on the hydraulic oil tank side.   4. The work machine according to claim 2, wherein a second inclined surface is provided at a rear portion of the hydraulic oil tank and inclined toward an outer side of the machine body toward a rear side on a surface on the engine control unit side.   The work machine according to claim 1, wherein the engine control unit is attached to the hydraulic oil tank.

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