Work Machine

Abstract

To provide a work machine in which affection of heat of an engine to a hydraulic oil tank is reduced.SOLUTION: A work machine comprises: a vehicle body; a building attached to the vehicle body; an engine driving the vehicle body; a hydraulic oil tank storing hydraulic oil; and a cooling device cooling the engine and the hydraulic oil. The building is constituted of a building frame and an exterior cover. In the building, the engine, the cooling device and the hydraulic oil tank are stored. In an inside space of the building, an engine room storing the engine, a cooling system room storing the cooling device, and a hydraulic oil tank room storing the hydraulic oil tank are partitioned by the building frame. The engine room and the cooling system room are covered with the exterior cover. The hydraulic oil tank room is disposed to be adjacent to the engine room and at least a part of the engine room is open to an outside of the building. The building frame is constituted to have a heat insulation wall separating the engine room and the hydraulic oil tank room.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to a work machine having a heat countermeasure applied inside a building. [Background technology]

[0002] 2. Description of the Related Art Conventionally, work machines such as hydraulic excavators and wheel loaders have a front work unit and a building that houses components that operate the front work unit (e.g., an engine, an aftertreatment device, a cooling device, a hydraulic oil tank, etc.).

[0003] In such a work machine, the engine in particular becomes very hot, so heat countermeasures are necessary inside the building. Patent Document 1 discloses a technique for preventing the heat of the engine from being transmitted to the hydraulic oil tank by placing a heat shield between the engine and the hydraulic oil tank. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2007-308965 A Summary of the Invention [Problem to be solved by the invention]

[0005] However, the heat shield in Patent Document 1 only partially separates the engine from the hydraulic oil tank. In addition, the hydraulic oil tank in Patent Document 1 is covered with a cover material. Therefore, the heat of the engine significantly affects the hydraulic oil tank, and further measures such as enlarging the hydraulic oil cooler are required.

[0006] The present invention has been made in consideration of the above-mentioned circumstances, and an object of the present invention is to provide a work machine in which the effect of engine heat on a hydraulic oil tank is reduced. [Means for solving the problem]

[0007] In order to achieve the above object, the present invention provides a working machine comprising a vehicle body, a building attached to the vehicle body, an engine for driving the vehicle body, a hydraulic oil tank for storing hydraulic oil, and a cooling device for cooling the engine and the hydraulic oil, the building being composed of a building frame and an exterior cover, the engine, the cooling device, and the hydraulic oil tank being housed in the building, the building frame defining an engine room for housing the engine, a cooling system room for housing the cooling device, and a hydraulic oil tank room for housing the hydraulic oil tank in an internal space of the building, the engine room and the cooling system room being covered by the exterior cover, the hydraulic oil tank room being disposed adjacent to the engine room and at least a portion of which is open to the outside of the building, the building frame comprising a heat insulating wall separating the engine room and the hydraulic oil tank room, A pair of side walls protruding from both ends of the heat shield wall in the vehicle width direction toward the front of the work machine, and a base provided at the lower part of the pair of side walls. The present invention is configured to include The hydraulic oil tank room is defined by the heat insulating wall and the pair of side walls, and the upper surface is open to the outside of the building, the upper part of the rear surface of the hydraulic oil tank is supported by the heat insulating wall via a first vibration isolating member, and the lower surface of the hydraulic oil tank is supported by the base via a second vibration isolating member. It is characterized by: Effect of the Invention

[0008] According to the present invention, it is possible to obtain a work machine in which the effect of heat from the engine on the hydraulic oil tank is reduced. Note that problems, configurations and effects other than those described above will become apparent from the description of the following embodiments. [Brief description of the drawings]

[0009] [Figure 1] FIG. 1 is a side view of a wheel loader according to an embodiment of the present invention. [Diagram 2] FIG. 2 is a perspective view of the engine building with the side cover removed, viewed from above and in front. [Diagram 3] FIG. 2 is a perspective view of the engine building with the side cover removed, viewed from above and behind. [Figure 4] This is an oblique view of the building frame from above and in front. [Diagram 5] This is an oblique view of the building frame from above and rear. [Figure 6] FIG. 1 is a diagram showing each room defined by a building frame. [Figure 7] FIG. 4 is a right side view of the rear frame and the building frame. [Figure 8] FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] An embodiment of a wheel loader 10 according to the present invention will be described below with reference to the drawings. In this specification, unless otherwise specified, front, rear, left and right are based on the viewpoint of an operator who rides on and operates the wheel loader 10. Specific examples of the work machine are not limited to the wheel loader 10, and may be a hydraulic excavator, a dump truck, a crane, etc.

[0011] Fig. 1 is a side view of a wheel loader 10 according to this embodiment. As shown in Fig. 1, the wheel loader 10 has a vehicle body made up of a front frame 11 and a rear frame 12. The front frame 11 and the rear frame 12 are connected by a center pin 13 so as to be rotatable in the left-right direction. The front frame 11 and the rear frame 12 are also connected by a pair of left and right steering cylinders 14L, 14R. The pair of steering cylinders 14L, 14R extend and retract when supplied with hydraulic oil from a hydraulic pump (not shown).

[0012] By extending one of the pair of steering cylinders 14L, 14R and retracting the other, the front frame 11 bends left and right relative to the rear frame 12 about the center pin 13. This changes the relative mounting angle between the front frame 11 and the rear frame 12, causing the vehicle body to bend and change direction. In other words, this wheel loader 10 is an articulate type in which the front frame 11 and the rear frame 12 bend about the center pin 13.

[0013] The front frame 11 supports a pair of left and right front tires 15L, 15R and a front working mechanism 16 (working device). The front working mechanism 16 is composed of a lift arm 17, a bucket 18, a pair of lift arm cylinders (not shown), a bucket cylinder 19, and a bell crank 20.

[0014] The lift arm 17 is attached to the front frame 11. The lift arm 17 extends in the front-rear direction. More specifically, the front end of the lift arm 17 is rotatably connected to the bucket 18, and the rear end of the lift arm 17 is rotatably connected to the front frame 11. The lift arm 17 rotates in the up-down direction (moves up and down) by the extension and contraction of a pair of lift arm cylinders.

[0015] The bucket 18 has a concave space capable of accommodating cargo (such as soil and sand). The bucket 18 is supported rotatably (tiltably or dumpably) at the front end of the lift arm 17. More specifically, the bucket 18 rotates in the vertical direction as a bell crank 20 rotates in conjunction with the extension and contraction of a bucket cylinder 19.

[0016] The rear frame 12 supports a pair of left and right rear tires 21L, 21R, a cab 22 (driver's cab), and an engine building 23 (building).

[0017] The cab 22 is attached to the rear frame 12 in front of the engine building 23. An internal space is formed in the cab 22 for an operator to operate the wheel loader 10. Inside the cab 22, there is a seat (not shown) on which the operator sits, and an operation device (not shown) operated by the operator seated in the seat. The wheel loader 10 travels and the front work implement 16 operates when the operator in the cab 22 operates the operation device.

[0018] The engine building 23 is attached to the rear frame 12 behind the cab 22. The engine building 23 is composed of an exterior cover and a building frame 40 (see FIGS. 4 and 5). The exterior cover includes a pair of side covers 24L, 24R, a top cover 25, and a rear cover 26. The engine building 23 has an internal space surrounded by the pair of side covers 24L, 24R, the top cover 25, and the rear cover 26.

[0019] The pair of side covers 24L, 24R are erected at a distance from each other in the left-right direction and define the left-right ends of the engine building 23. The top cover 25 is hung across the upper ends of the pair of side covers 24L, 24R and defines the upper end of the engine building 23. The rear cover 26 is hung across the rear end of the pair of side covers 24L, 24R and the top cover 25 and defines the rear end of the engine building 23. In addition, the side covers 24L, 24R and the rear cover 26 are provided with openings for ventilation.

[0020] The wheel loader 10 also includes a pair of left and right handrails 27L, 27R. One end of the handrails 27L, 27R is fixed to both side surfaces of the wheel loader 10. More specifically, the handrails 27L, 27R are fixed to handrail support members provided on both side surfaces of the rear frame 12. The other ends of the handrails 27L, 27R are fixed to the outer surface of the front end of the engine building 23. One end of the pair of left and right handrails 27L, 27R is fixed at a position in front of the vehicle body based on the fixing position of the other end, and is fixed at a position on the side of the vehicle body based on the fixing position of the other end. The handrails 27L, 27R are used to stabilize the posture by being grasped by an operator who is about to get into the cab 22 or an operator who is about to perform maintenance such as filter replacement of the hydraulic oil tank 31.

[0021] Fig. 2 is a perspective view of the engine building 23 with the side covers 24L, 24R removed, as viewed from above the front. Fig. 3 is a perspective view of the engine building 23 with the side covers 24L, 24R removed, as viewed from above the rear. As shown in Figs. 2 and 3, the internal space of the engine building 23 accommodates an engine 28, an aftertreatment device 29, a heat exchanger 30, a cooling fan (not shown), a hydraulic oil tank 31, a hydraulic circuit (not shown, for example, a hydraulic pump, a valve), and a building frame 40.

[0022] The engine 28 generates a driving force for operating the wheel loader 10. The driving force of the engine 28 is transmitted to rotate the front tires 15L, 15R and the rear tires 21L, 21R. This causes the wheel loader 10 to travel. The engine 28 may also be equipped with a turbocharger. The aftertreatment device 29 purifies and discharges exhaust gas discharged from the engine 28. The aftertreatment device 29 removes, for example, Nox, NO, CO, HC, and the like from the exhaust gas. The engine 28 also drives a hydraulic pump. The hydraulic pump supplies hydraulic oil to a hydraulic motor to rotate the hydraulic motor. The hydraulic motor is connected to a cooling fan, which will be described later, and rotates the cooling fan.

[0023] The heat exchanger 30 cools various liquids (for example, cooling water, hydraulic oil, transmission oil, etc.) by exchanging heat with cooling air. The heat exchanger 30 includes, for example, a radiator that cools the cooling water of the engine 28, an intercooler that cools the cooling water of the turbocharger, a hydraulic oil cooler that cools the hydraulic oil stored in the hydraulic oil tank 31, and a mission oil cooler that cools the transmission mission oil. The cooling fan is rotated by the driving force of the engine 28 via a hydraulic motor and a hydraulic pump, and supplies cooling air to the heat exchanger 30. The heat exchanger 30 and the cooling fan are examples of a cooling device.

[0024] The hydraulic oil tank 31 stores hydraulic oil. The hydraulic circuit supplies the hydraulic oil stored in the hydraulic oil tank 31 to hydraulic actuators (for example, the steering cylinders 14L, 14R, the lift arm cylinder, and the bucket cylinder 19). As a result, the wheel loader 10 turns and the front work implement 16 operates.

[0025] Fig. 4 is a perspective view of the building frame 40 as viewed from above the front. Fig. 5 is a perspective view of the building frame 40 as viewed from above the rear. As shown in Figs. 4 and 5, the building frame 40 mainly includes a front panel 41, a rear panel 42, a pair of left and right column members 43L, 43R, a pair of left and right beam members 44L, 44R, and an upper panel 45.

[0026] The front panel 41 is composed of a heat shielding wall 46 and a pair of left and right side walls 47L, 47R. The heat shielding wall 46 is a plate-shaped member that extends in the up-down and left-right directions. The heat shielding wall 46 extends over the entire height of the building frame 40. The heat shielding wall 46 is further formed with a through hole 46a that penetrates the wall in the thickness direction at the lower end, and a through hole 46b that penetrates the wall in the thickness direction above the through hole 46a.

[0027] The side walls 47L, 47R protrude forward from the left and right ends (both ends in the vehicle width direction) of the heat shield wall 46 and extend in the vertical direction. In addition, pedestals 48L, 48R for supporting the hydraulic oil tank 31 are provided at the lower parts of the side walls 47L, 47R, respectively. In addition, the lower end of the front panel 41 is supported by the rear frame 12.

[0028] The rear panel 42 is disposed at a position spaced rearward from the front panel 41. The rear panel 42 is a plate-shaped member extending in the up-down and left-right directions. The rear panel 42 extends across the lower half of the building frame 40 in the height direction. A lower end of the rear panel 42 is supported by the rear frame 12. The rear panel 42 defines the rear end of the building frame 40.

[0029] The pillar members 43L, 43R are rod-shaped members extending in the up-down direction at positions spaced apart in the left-right direction. The pillar members 43L, 43R are fixed to the outer surfaces of the front ends of the side walls 47L, 47R. The lower ends of the pillar members 43L, 43R are supported by the rear frame 12. More specifically, front panel support members 57L, 57R connected to the lower end of the front panel 41 and the pair of left and right pillar members 43L, 43R are supported by the rear frame 12 in front of and behind the pair of left and right pillar members 43L, 43R.

[0030] The beam members 44L, 44R are rod-shaped members extending in the front-rear direction at positions spaced apart in the left-right direction. The front ends of the beam members 44L, 44R are connected to the center in the up-down direction of the back surface of the front panel 41 via a bracket 49. The rear ends of the beam members 44L, 44R are connected to the upper end of the rear panel 42. The beam members 44L, 44R define the left and right ends of the building frame 40. Furthermore, the beam members 44L, 44R are connected to each other by a reinforcing member 50 extending in the left-right direction behind the front panel 41 and in front of the rear panel 42 and the upper panel 45.

[0031] The upper panel 45 is disposed rearward of the front panel 41 and forward of the rear panel 42. The upper panel 45 is erected on the beam members 44L, 44R and extends in the left-right direction. The upper ends of the front panel 41 and the upper panel 45 define the upper end of the building frame 40.

[0032] Fig. 6 is a diagram showing each of the chambers 51 to 54 defined by the building frame 40. As shown in Fig. 6, in the internal space of the engine building 23, the building frame 40 defines an engine compartment 51 that houses the engine 28, an aftertreatment chamber 52 that houses the aftertreatment device 29, a cooling system chamber 53 that houses the heat exchanger 30 and the cooling fan, and a hydraulic oil tank chamber 54 that houses the hydraulic oil tank 31.

[0033] The engine compartment 51 is a space surrounded by the heat shield wall 46, the rear panel 42, the beam members 44L and 44R, and the reinforcing member 50. More specifically, the engine compartment 51 is a space rearward of the heat shield wall 46, forward of the rear panel 42, and below the beam members 44L and 44R, and the reinforcing member 50. The engine compartment 51 is located in the internal space of the engine building 23, below the aftertreatment chamber 52, forward of the cooling system chamber 53, and rearward of the hydraulic oil tank chamber 54. The engine compartment 51 is also covered by an exterior cover.

[0034] The post-treatment chamber 52 is a space surrounded by the heat shield wall 46, the upper panel 45, the beam members 44L and 44R, and the reinforcing member 50. More specifically, the post-treatment chamber 52 is a space rearward of the heat shield wall 46, forward of the upper panel 45, and above the beam members 44L and 44R, and the reinforcing member 50. The post-treatment chamber 52 is located in the internal space of the engine building 23, above the engine compartment 51, forward of the cooling system compartment 53, and rearward of the hydraulic oil tank compartment 54. The post-treatment chamber 52 is covered by an exterior cover.

[0035] The cooling system chamber 53 is a space behind the rear panel 42 and the upper panel 45. That is, the cooling system chamber 53 is located behind the engine chamber 51 and the after-treatment chamber 52 in the internal space of the engine building 23. In addition, the after-treatment chamber 52 is covered with an exterior cover.

[0036] The hydraulic oil tank chamber 54 is a space surrounded by the heat shield wall 46 and the pair of side walls 47L, 47R. More specifically, the hydraulic oil tank chamber 54 is a space in front of the heat shield wall 46, to the right of the side wall 47L, and to the left of the side wall 47R. The hydraulic oil tank chamber 54 is located in front of the engine chamber 51 and the post-treatment chamber 52 in the internal space of the engine building 23. At least a portion of the hydraulic oil tank chamber 54 (the upper surface in this embodiment) is open to the outside of the engine building 23.

[0037] The engine chamber 51 and the post-treatment chamber 52 are adjacent to each other in the vertical direction. Moreover, the engine chamber 51, the post-treatment chamber 52 and the cooling system chamber 53 are adjacent to each other in the front-rear direction. Furthermore, the engine chamber 51, the post-treatment chamber 52 and the hydraulic oil tank chamber 54 are adjacent to each other in the front-rear direction. The heat insulating wall 46 is disposed between the engine chamber 51, the post-treatment chamber 52 and the hydraulic oil tank chamber 54, and is formed to straddle the engine chamber 51 and the post-treatment chamber 52 in the vertical direction.

[0038] Furthermore, the hydraulic oil tank 31 is supported on the building frame 40 within the hydraulic oil tank chamber 54 via vibration-isolating rubbers 55, 56 (vibration-isolating members). The vibration-isolating rubber 55 is disposed at the upper end of the front surface of the heat insulating wall 46. The vibration-isolating rubber 56 is disposed on the upper surfaces of the pedestals 48L, 48R. That is, the hydraulic oil tank 31 is supported at its back surface by the heat insulating wall 46 via the vibration-isolating rubber 55, and at its bottom surface by the pedestals 48L, 48R via the vibration-isolating rubber 56.

[0039] Among the components housed in the engine building 23, the engine 28 and the after-treatment device 29 have high temperatures. Therefore, the heat insulating wall 46 separates the engine compartment 51 and the after-treatment device 52 from the hydraulic oil tank compartment 54. In addition, the rear panel 42 and the upper panel 45 separate the engine compartment 51 and the after-treatment device 52 from the cooling system compartment 53. The heat insulating wall 46, the rear panel 42, and the upper panel 45 suppress the heat generated from the engine 28 and the after-treatment device 29 from being transmitted to the hydraulic oil tank 31 and the heat exchanger 30.

[0040] Fig. 7 is a right side view of the rear frame 12 and the building frame 40. As shown in Fig. 7, the heat exchanger 30 (particularly the hydraulic oil cooler) is disposed at the rear end of the engine building 23, and the hydraulic oil tank 31 is disposed at the front end of the engine building 23. Thus, the wheel loader 10 has a pair of hoses 32a, 32b for circulating hydraulic oil between the heat exchanger 30 and the hydraulic oil tank 31.

[0041] One end of the hoses 32a, 32b is connected to the heat exchanger 30, and the other end is connected to the hydraulic oil tank 31. The hoses 32a, 32b extend in the front-rear direction along the right surface of the rear frame 12. The hoses 32a, 32b are disposed below the engine compartment 51. The hoses 32a, 32b enter the hydraulic oil tank chamber 54 through the through hole 46a. A remaining amount sensor (not shown) that detects the amount of hydraulic oil stored in the hydraulic oil tank 31 is attached to the through hole 46b. The remaining amount sensor is, for example, a level sensor.

[0042] 8 is a perspective view of a main part of the rear frame 12. As shown in FIG. 8, the top cover 25 is supported by the upper end of the front panel 41 (more specifically, the heat shield wall 46) and the upper end of the upper panel 45. That is, the top cover 25 covers the upper parts of the post-treatment chamber 52 and the cooling system chamber 53. On the other hand, the top cover 25 extends rearward from the heat shield wall 46. That is, the top cover 25 does not cover the upper part of the hydraulic oil tank chamber 54. In other words, the upper surface of the hydraulic oil tank chamber 54 is open to the outside of the engine building 23.

[0043] The side cover 24L is supported by the pillar member 43L (the front end of the side wall 47L) via hinges 33a and 33b so as to be openable and closable. More specifically, the side cover 24L is configured to be rotatable around a rotation axis extending in the vertical direction. In other words, the side cover 24L is configured to be rotatable on a horizontal plane with the front end as the rotation base end and the rear end as the rotation tip end. The side cover 24L rotates between a closed position and an open position. The same applies to the side cover 24R.

[0044] 8, the closed position is a position of the side covers 24L, 24R that closes the side surfaces of the internal space of the engine building 23. More specifically, the closed position is a position of the side covers 24L, 24R that covers the side surfaces of the engine compartment 51, the aftertreatment compartment 52, and the cooling system compartment 53. In other words, when the side covers 24L, 24R are in the closed position, the operator cannot access the engine 28, the aftertreatment device 29, and the heat exchanger 30.

[0045] The open position is a position of the side covers 24L, 24R that opens the side surfaces of the internal space of the engine building 23. More specifically, the open position is a position of the side covers 24L, 24R that exposes the side surfaces of the engine compartment 51, the aftertreatment compartment 52, and the cooling system compartment 53. That is, an operator can access (for example, perform maintenance on) the engine 28, the aftertreatment device 29, and the heat exchanger 30 by moving the side covers 24L, 24R from the closed position to the open position.

[0046] According to the above embodiment, by separating the engine chamber 51 and the post-treatment chamber 52 from the hydraulic oil tank chamber 54 by the heat insulating wall 46, the influence of heat from the engine 28 and the post-treatment device 29 on the hydraulic oil tank 31 can be reduced. As a result, the hydraulic oil cooler can be made smaller. Note that the positional relationship between the engine chamber 51, the post-treatment chamber 52, the cooling system chamber 53, and the hydraulic oil tank chamber 54 is not limited to the example in FIG. 6. Also, it is sufficient that the heat insulating wall 46 separates at least the engine chamber 51 and the hydraulic oil tank chamber 54.

[0047] Furthermore, according to the above embodiment, a portion of the hydraulic oil tank chamber 54 is open to the outside of the engine building 23, so that it is possible to prevent heat transmitted from the engine chamber 51 and the post-treatment chamber 52 from being trapped in the hydraulic oil tank chamber 54. As a result, it is possible to further suppress the temperature rise in the hydraulic oil tank chamber 54. Note that the portion that is open is not limited to the upper surface of the hydraulic oil tank chamber 54. However, since a filler port for refilling hydraulic oil is generally provided on the upper surface of the hydraulic oil tank 31, opening the upper surface of the hydraulic oil tank chamber 54 can also simplify the work of refilling hydraulic oil.

[0048] Furthermore, according to the above embodiment, the hydraulic oil tank 31 is supported on the building frame 40 via the vibration isolating rubbers 55, 56, so it is possible to suppress the vibrations generated by the wheel loader 10 from being propagated to the hydraulic oil tank 31 via the rear frame 12. In particular, in the above embodiment, the hydraulic oil tank 31 is not connected to other vehicle body structures without the vibration isolating rubbers 55, 56, so it is possible to suppress the vibrations generated by the wheel loader 10 from being propagated to the hydraulic oil tank 31. For example, the handrails 27L, 27R are supported by the building frame 40, not by the hydraulic oil tank 31.

[0049] Furthermore, according to the above embodiment, one end of the pair of left and right handrails 27L, 27R is fixed at a position on the vehicle body further forward than the other end fixed to the side surface of the front end of the building frame 40, and is fixed at a position on the vehicle body further to the side than the other end. In other words, the pair of left and right handrails 27L, 27R are formed so as to reinforce the building frame 40 in the front-rear direction and the vehicle width direction. In other words, the pair of left and right handrails 27L, 27R reduce the influence of the vibration generated by the wheel loader 10 on the building frame 40, and further reduce the influence of the vibration generated by the wheel loader 10 on the parts mounted on the building frame 40, including the hydraulic oil tank 31.

[0050] Furthermore, according to the above embodiment, since the side covers 24L, 24R are supported by the pillar members 43L, 43R (i.e., the front ends of the building frame 40), a larger area is exposed when the side covers 24L, 24R are moved to the open position. As a result, maintenance work on the components housed in the engine building 23 becomes easier.

[0051] According to the above embodiment, the heat shielding wall 46 extends over the entire height and width of the building frame 40, so that deformation of the building frame 40 caused by vibrations generated by the wheel loader 10 and external loads can be suppressed. For example, when a load is generated on one side of the vehicle body due to the unevenness of the road surface on which the wheel loader 10 runs, the relative deformation of the building frame 40 between the left and right sides can be suppressed. Furthermore, since the heat shielding wall 46 faces the pedestals 48L and 48R for supporting the hydraulic oil tank 31, the relative displacement between the left pedestal 48L and the right pedestal 48R in particular can be suppressed. Accordingly, the twisting of the hydraulic oil tank 31 supported by the pedestals 48L and 48R via the vibration isolating rubber 56 is suppressed, and the hydraulic oil tank 31 can be prevented from being damaged.

[0052] The above-described embodiments are illustrative examples of the present invention, and are not intended to limit the scope of the present invention to these embodiments. Those skilled in the art can implement the present invention in various other forms without departing from the gist of the present invention. [Explanation of symbols]

[0053] 10. Wheel Loader 11 Previous Frame 12 Rear frame 13 Center pin 14L, 14R steering cylinder 15L, 15R front tires 16 Front work equipment 17 Lift arm 18 Bucket 19 Bucket cylinder 20 Bell crank 21L, 21R rear tires 22 Cab (operator's compartment) 23 Engine Building 24L, 24R Side cover (exterior cover) 25 Top cover (exterior cover) 26 Rear cover (exterior cover) 27L, 27R Handrails 28 Engine 29 Aftertreatment device 30 heat exchanger 31 Hydraulic Oil Tank 32a, 32b Hose 33a, 33b hinge 40 Building Frame 41 Front Panel 42 Rear Panel 43L,43R Column members 44L, 44R Beam member 45 Upper Panel 46 Heat shield wall 46a,46b through hole 47L, 47R side wall 48L, 48R Pedestal 49 Bracket 50 Reinforcement member 51 Engine Room 52 Post-processing room 53 Cooling system room 54 Hydraulic oil tank room 55,56 Anti-vibration rubber (anti-vibration material)

Claims

1. The car body and A building attached to the vehicle body; An engine that drives the vehicle body; A hydraulic oil tank for storing hydraulic oil; A cooling device for cooling the engine and hydraulic oil; Equipped with The building is composed of a building frame and an exterior cover, In the work machine, the building accommodates the engine, the cooling device, and the hydraulic oil tank, an engine room for accommodating the engine, a cooling system room for accommodating the cooling device, and a hydraulic oil tank room for accommodating the hydraulic oil tank are defined in an internal space of the building by the building frame; the engine compartment and the cooling system compartment are covered by the exterior cover, the hydraulic oil tank room is disposed adjacent to the engine room and at least a portion of the hydraulic oil tank room is open to the outside of the building; the building frame is configured to include a heat insulating wall that separates the engine room and the hydraulic oil tank room, a pair of side walls that protrude toward the front of the work machine from both ends of the heat insulating wall in a vehicle width direction, and bases provided on lower parts of the pair of side walls, the hydraulic oil tank chamber is defined by the heat insulating wall and the pair of side walls, and an upper surface of the hydraulic oil tank chamber is open to the outside of the building, an upper portion of a rear surface of the hydraulic oil tank is supported by the heat insulating wall via a first vibration isolating member; The lower surface of the hydraulic oil tank is supported by the base via a second vibration isolating member. A working machine characterized by:

2. 2. The work machine according to claim 1, A cab located in a front portion of the building and attached to the vehicle body; A handrail is located on a side of the driver's cab in a vehicle width direction, one end of which is attached to the vehicle body and the other end of which is supported by the side wall of the building frame; Equipped A working machine characterized by:

3. 2. The work machine according to claim 1, The exterior cover includes a side cover supported on a front end of the side wall of the building frame via a hinge so as to be rotatable between a closing position for closing a side surface of the building and an opening position for opening the side surface of the building. A working machine characterized by:

4. 2. The work machine according to claim 1, an aftertreatment device for treating exhaust gas discharged from the engine; a post-treatment chamber for accommodating the post-treatment device is defined in an internal space of the building by the building frame, the post-treatment chamber is covered by the exterior cover, The hydraulic oil tank chamber is disposed at a front end of the building frame, The engine chamber and the aftertreatment chamber are disposed adjacent to each other in the vertical direction behind the hydraulic oil tank chamber, the cooling system chamber is disposed rearward of the engine chamber and the aftertreatment chamber, The heat shield wall is formed across the engine chamber and the after-treatment chamber in the vertical direction and separates the engine chamber and the after-treatment chamber from the hydraulic oil tank chamber. A working machine characterized by:

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