Work machine

Abstract

To provide a work machine that enables reduction of a temperature in an engine room after an engine is stopped, while preventing infiltration of an external substance into the engine room.SOLUTION: A wheel loader 1 includes: an engine room 31; a cooler room 32 having a ventilation port part 132A through which outside air is allowed to come in and out; and a partition wall 130 that partitions the engine room 31 and the cooler room 32 in a longitudinal direction of a vehicle body. The wheel loader 1 includes: an opening 41 formed in the partition wall 130 so as to allow communication between the inside of the engine room 31 and the inside of the cooler room 32; an opening / closing door 42 provided so as to be changeable between an open state in which the opening 41 is opened and a closed state in which the opening 41 is closed; a drive device 6 that switches the opening / closing state of the opening / closing door 42; and a controller 7 that controls the drive device 6. The controller 7 outputs a close instruction signal to the drive device 6 to bring the opening / closing door 42 into the closed state when the engine 311 is started, and outputs an open instruction signal to the drive device 6 to bring the opening / closing door 42 into the open state when the engine 311 is stopped.SELECTED DRAWING: Figure 10

Description

Technical Field

[0001] The present invention relates to a working machine including an engine room in which an engine is housed.

Background Art

[0002] A working machine may operate under severe conditions for an engine as a drive source, such as operating in a high-temperature environment or continuously operating at maximum output within a range where it does not become overloaded. In such a case, since the inside of the engine room remains at a high temperature even after the engine stops, a technique for efficiently reducing the temperature inside the engine room has been conventionally demanded.

[0003] For example, Patent Document 1 discloses a technique for reducing the temperature of the engine room by opening an opening / closing cover on the upper surface of the engine room when the temperature inside the engine room is high at a predetermined temperature or higher when the engine stops.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] However, in the technique described in Patent Document 1, since the vehicle body stops with the opening / closing cover on the upper surface of the engine room open, there is a risk that, for example, rainwater, dust, etc. may enter the engine room.

[0006] Therefore, an object of the present invention is to provide a working machine capable of reducing the temperature inside the engine room after the engine stops while preventing the intrusion of external substances into the engine room.

Means for Solving the Problems

[0007] In order to achieve the above object, the present invention provides a working machine including a vehicle body, an engine room provided in the vehicle body and housing an engine therein, a cooler room provided in the vehicle body and housing a heat exchanger therein and having a vent portion through which outside air enters and exits, and a partition wall that separates the engine room and the cooler room in the front-rear direction of the vehicle body. In the working machine, an opening formed in the partition wall and communicating the inside of the engine room and the inside of the cooler room, an opening / closing member provided so as to be changeable between an open state in which the opening is opened and a closed state in which the opening is closed, a driving device that switches the opening / closing state of the opening / closing member, and a controller that controls the driving device. The controller outputs a close command signal for closing the opening / closing member to the driving device when the engine starts, and outputs an open command signal for opening the opening / closing member to the driving device when the engine stops.

Advantages of the Invention

[0008] According to the present invention, it is possible to prevent the intrusion of external substances into the engine room and reduce the temperature in the engine room after the engine stops. Problems, configurations, and effects other than those described above will be clarified by the following description of the embodiments.

Brief Description of the Drawings

[0009]

Figure 1

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Figure 11

Figure 12

Embodiments for Carrying Out the Invention

[0010] Hereinafter, as an aspect of a working machine according to an embodiment of the present invention, a wheel loader, which is a wheel-type working machine, will be described as an example.

[0011] <Overall Configuration of Wheel Loader 1> First, the overall configuration of the wheel loader 1 will be described with reference to FIGS. 1 to 5.

[0012] FIG. 1 is an external side view showing a configuration example of the wheel loader 1 according to an embodiment of the present invention. FIG. 2 is a left side view showing a configuration example of the building 13. FIG. 3 is a left side view showing the state inside the building 13. FIG. 4 is a perspective view showing a configuration example of the rear end portion of the building 13. FIG. 5 is a diagram showing the air flow inside the building 13 when the engine 311 is operating.

[0013] As shown in FIG. 1, the wheel loader 1 is an articulated work vehicle that is steered by the body being bent in the vicinity of the center, and a front frame 1A that is the front part of the body and a rear frame 1B that is the rear part of the body are rotatably connected in the left-right direction by a center joint 10, and the front frame 1A bends in the left-right direction with respect to the rear frame 1B. In the following description, among the left-right direction (vehicle width direction) of the vehicle body, the direction on the left side with respect to the forward direction is referred to as the "left direction", and the direction on the right side with respect to the forward direction is referred to as the "right direction".

[0014] The vehicle body is provided with four wheels 11, with two wheels 11 serving as front wheels 11A provided on both the left and right sides of the front frame 1A, and the remaining two wheels 11 serving as rear wheels 11B provided on both the left and right sides of the rear frame 1B, respectively. In FIG. 1, only the front wheel 11A and the rear wheel 11B provided on the left side among the four wheels 11 are shown.

[0015] At the front part of the front frame 1A, a working device 2 for performing a loading operation of excavating a work object such as earth and sand or minerals and loading it into a loading destination such as a dump truck or a hopper is attached.

[0016] The working device 2 includes a lift arm 21 rotatably attached to the front frame 1A in the vertical direction, two lift arm cylinders 22 for driving the lift arm 21, a bucket 23 rotatably attached to the tip of the lift arm 21 in the vertical direction, a bucket cylinder 24 for driving the bucket 23, and a bell crank 25 rotatably connected to the lift arm 21 to form a link mechanism between the bucket 23 and the bucket cylinder 24.

[0017] The two lift arm cylinders 22 are arranged side by side at a predetermined interval in the left - right direction of the vehicle body. In FIG. 1, only the left lift arm cylinder 22 is shown by a dashed line.

[0018] The lift arm 21 rotates upward with respect to the front frame 1A (lifting operation) when the rods 220 of the two lift arm cylinders 22 extend, and rotates downward with respect to the front frame 1A (lowering operation) when the rods 220 of the two lift arm cylinders 22 contract.

[0019] The bucket 23 rotates upward with respect to the lift arm 21 and tilts backward (tilting operation) as the rod 240 of the bucket cylinder 24 extends, and rotates downward with respect to the lift arm 21 and tilts forward (dumping operation) as the rod 240 of the bucket cylinder 24 contracts. Thereby, the bucket 23 can scoop up and discharge (excavate and dump) work objects such as earth and sand and minerals.

[0020] Note that the bucket 23 can be replaced with various attachments such as a blade or a plow. In addition to the cargo handling work using the bucket 23, the wheel loader 1 can also perform various operations such as snow removal work and earth pressing work.

[0021] The rear frame 1B is provided with a cab 12 on which an operator rides, a building 13 that defines an accommodation room inside for accommodating various devices necessary for driving the wheel loader 1, and a counterweight 14 for maintaining the balance with the working device 2 so that the vehicle body does not tip over. In the rear frame 1B, the cab 12 is arranged at the front, the counterweight 14 is arranged at the rear, and the building 13 is arranged between the cab 12 and the counterweight 14.

[0022] As shown in FIG. 2, the building 13 includes a ceiling cover 131 that is arranged to face the rear frame 1B and covers the upper part of the accommodation room, a pair of side covers 132 that cover the accommodation room from both sides in the left - right direction of the vehicle body between the frame 1B and the ceiling cover 131, and a rear cover 133 that covers the accommodation room from the rear of the vehicle body between the frame 1B and the ceiling cover 131.

[0023] As shown in FIGS. 2 and 3, the accommodation room of the building 13 is partitioned by a partition wall 130 provided to face the rear cover 133 into a front - side engine room 31 and a rear - side cooler room 32. In other words, the engine room 31 and the cooler room 32 are separated in the front - rear direction of the vehicle body by the partition wall 130. Note that the partition wall 130 is shown by a dashed line in FIG. 2 and by hatching in FIG. 3, respectively.

[0024] Inside the engine compartment 31, an engine 311 and a post-treatment device 312 for purifying the exhaust gas discharged from the engine 311 are accommodated. As shown in FIG. 3, the post-treatment device 312 is disposed above the engine 311 and is supported by a support bracket 313 as a support member from below. Therefore, the vertical positions of the engine 311, the post-treatment device 312, and the support bracket 313 in the engine compartment 31 are in the order of the engine 311, the support bracket 313, and the post-treatment device 312 from the lower side to the upper side.

[0025] Also, from a portion of the ceiling cover 131 corresponding to the upper part of the rear end side of the engine compartment 31, a tail pipe 314 for discharging the exhaust gas purified through the post-treatment device 312 to the outside protrudes toward the rear of the vehicle body.

[0026] Inside the cooler compartment 32, as shown in FIGS. 3 and 4, there is a heat exchanger unit 321 composed of a plurality of heat exchangers such as a radiator for cooling the cooling water of the engine 311, an oil cooler for cooling the hydraulic oil, and an intercooler for cooling the air pressurized by the supercharger of the engine 311, and a cooling fan 322 for generating cooling air for cooling the heat exchanger unit 321.

[0027] The cooling fan 322 is disposed at the rear end of the cooler compartment 32 such that the axial direction of the rotation axis is along the front-rear direction of the vehicle body, in other words, such that the intake and exhaust surfaces face the partition wall 130. The heat exchanger unit 321 is disposed adjacent to the front side of the cooling fan 322.

[0028] Also, as shown in FIGS. 2 and 3, a grill 133A attached to the rear cover 133 is disposed opposite to the intake and exhaust surfaces of the cooling fan 322 on the rear side of the cooling fan 322.

[0029] Furthermore, as shown in FIGS. 2, 4, and 5, vent holes 132A for taking in air (outside air) into the cooler chamber 32 are provided in portions of a pair of side covers 132 corresponding to both left and right sides of the cooler chamber 32 in the lateral direction. Therefore, outside air enters and exits the cooler chamber 32 through each vent hole 132A. Note that in FIGS. 2 and 4, only the left side cover 132 of the pair of side covers 132 is shown.

[0030] The radiator, oil cooler, and intercooler of the heat exchanger unit 321, as well as the cooling fan 322, each operate when the engine 311 operates. In other words, while the engine 311 is stopped, the radiator, oil cooler, and intercooler of the heat exchanger unit 321, as well as the cooling fan 322, are also stopped.

[0031] The engine 311 is started and stopped by the operator operating an engine key 120 (shown in FIG. 11) as an engine operating device provided in the cab 12. Specifically, when the operator operates the engine key 120 to the on side, the engine 311 starts, and when the operator operates the engine key 120 to the off side, the engine 311 stops.

[0032] As shown in FIG. 5, when the cooling fan 322 rotates, air flows into the cooler chamber 32 from each vent hole 132A of the pair of side covers 132, and the heat exchanger unit 321 is cooled. The air that has flowed into the cooler chamber 32 is then discharged to the outside of the cooler chamber 32 through the grill 133A.

[0033] In the present embodiment, as shown in FIG. 4, a vent hole 131A is also provided in a portion of the ceiling cover 131 corresponding to the upper part of the cooler chamber 32. Therefore, when the cooling fan 322 rotates, in addition to each vent hole 132A of the pair of side covers 132, air also flows into the cooler chamber 32 from the vent hole 131A of the ceiling cover 131. Thereby, in the wheel loader 1, it is possible to efficiently cool the heat exchanger unit 321.

[0034] Note that the ventilation port for taking in air into the cooler chamber 32 does not necessarily have to be provided in each of the pair of side covers 132 and the ceiling cover 131, and it may be provided in either one of the pair of side covers 132.

[0035] <Structure of partition wall 130> Next, the structure of the partition wall 130 will be described with reference to FIGS. 6 to 10.

[0036] FIG. 6 is a perspective view of the partition wall 130 with the opening / closing door 42 closed, as viewed from the cooler chamber 32 side. FIG. 7 is a plan view showing the state where the opening / closing door 42 is closed. FIG. 8 is a perspective view of the partition wall 130 with the opening / closing door 42 open, as viewed from the cooler chamber 32 side. FIG. 9 is a plan view showing the state where the opening / closing door 42 is open. FIG. 10 is a diagram showing the air flow in the building 13 after the engine 311 stops.

[0037] As shown in FIGS. 8 and 9, an opening 41 that communicates the inside of the engine chamber 31 and the inside of the cooler chamber 32 is provided in the partition wall 130. In the present embodiment, the opening 41 is formed in a rectangular shape having a long side in the left-right direction of the vehicle body and a short side in the up-down direction of the vehicle body.

[0038] As indicated by the arrow in FIG. 10, after the engine 311 stops, the opening 41 guides the high-temperature air in the engine chamber 31 to the cooler chamber 32 side. The high-temperature air that has flowed into the cooler chamber 32 side through the opening 41 is discharged from the ventilation port 131A of the ceiling cover 131 and each ventilation port 132A of the pair of side covers 132.

[0039] Since high-temperature air tends to rise and the aftertreatment device 312 tends to become high in temperature, in the present embodiment, the opening 41 is disposed above the central portion in the left-right direction of the partition wall 130 so as to be located above the support bracket 313 (see FIG. 3).

[0040] Further, in this way, since the opening 41 is disposed at the central portion in the left - right direction in the partition wall 130, that is, at a position away from each ventilation port 132A of the side cover 132, it is possible to suppress rainwater, dust, etc. that enter the cooler chamber 32 from each ventilation port 132A of the side cover 132 from reaching the engine chamber 31.

[0041] In addition, in FIG. 3, although the entire opening 41 (shown by a broken line) is located above the support bracket 313, it is not limited to this. As long as at least the upper end portion 41A of the opening 41 is located above the support bracket 313.

[0042] Also, in the present embodiment, as shown in FIG. 10, the lower end 41B of the opening 41 is located below the uppermost end of each ventilation port 132A of the pair of side covers 132. That is, the opening 41 and each ventilation port 132A partially overlap in the vertical direction of the vehicle body. Thereby, since a part of each ventilation port 132A is arranged on the air conduction line of the high - temperature air passing through the opening 41, it is possible to discharge the high - temperature air that is likely to stay upward to the outside of the cooler chamber 32 as soon as possible.

[0043] As shown in FIGS. 6 - 9, the partition wall 130 is provided with an opening - closing door 42 as an opening - closing member that can be changed between an open state for opening the opening 41 and a closed state for closing the opening 41. As particularly shown in FIG. 7, the opening - closing door 42 is formed in a rectangular shape with a size that closes the opening 41. In FIG. 7, the opening 41 is shown by a broken line.

[0044] The opening / closing door 42 is in a closed state (closed state) when the engine 311 is operating, and in an open state (open state) when the engine 311 is stopped. As described above, since the opening 41 guides the high-temperature air in the engine compartment 31 to the cooler compartment 32 after the engine 311 stops, it is blocked by the opening / closing door 42 while the engine 311 is operating. Also, when the engine 311 is operating, in the cooler compartment 32, since the heat exchanger unit 321 is being cooled, it is not preferable for the high-temperature air in the engine compartment 31 to flow into the cooler compartment 32 through the opening 41.

[0045] In this embodiment, as shown in FIGS. 8 and 9, the opening / closing door 42 opens and closes in the vertical direction with respect to the opening 41. Specifically, as shown in FIGS. 6 and 7, when the opening / closing door 42 in the closed state (the state where the opening 41 is blocked) moves downward with respect to the opening 41, it becomes the "open state" and the opening 41 is exposed. When the opening / closing door 42 in the open state shown in FIGS. 8 and 9 moves upward, it becomes the "closed state" and the opening 41 is blocked.

[0046] The opening / closing door 42 does not necessarily have to open and close in the vertical direction with respect to the opening 41. However, as shown in FIGS. 6 and 8, since various pipes are routed through the peripheral portion of the partition wall 130 and penetrate the partition wall 130, by adopting a structure that opens and closes in the vertical direction with respect to the opening 41, it is possible to provide the opening / closing door 42 to the partition wall 130 without changing the routing layout of the various pipes.

[0047] The various pipes include, for example, a radiator pipe 51 connecting the engine 311 and the radiator, an engine air bleed pipe 52, an oil cooler pipe 53 connecting the oil cooler and the hydraulic oil tank, an intercooler pipe 54 connecting the engine 311 and the intercooler, an air conditioner pipe 55 connecting the air conditioner in the driver's cab 12 and the air conditioner condenser, and a urea pipe 56 connecting the aftertreatment device 312 and the urea pump.

[0048] In particular, the intercooler pipe 54 penetrates through the right side of the opening 41 and the opening and closing door 42 in the upper region of the partition wall 130, and the urea pipe 56 penetrates through the left side of the opening 41 and the opening and closing door 42 in the upper region of the partition wall 130. Therefore, the opening and closing door 42 is provided so as not to contact these pipes 54 and 56. Accordingly, the size of the opening 41 is set to be the largest between the intercooler pipe 54 and the urea pipe 56.

[0049] The opening and closing door 42 is driven by the driving device 6 to switch between the open and closed states. This driving device 6 is controlled by a controller 7 described later. Specifically, the driving device 6 includes a pair of slide rails 61 attached to both sides in the left-right direction of the opening 41 in the partition wall 130, an electric cylinder 62 provided adjacent to the left side of the left slide rail 61 in the partition wall 130, and a connecting bracket 63 that connects the electric cylinder 62 and the opening and closing door 42.

[0050] Each of the pair of slide rails 61 extends in the vertical direction of the partition wall 130, and both end portions in the left-right direction of the opening and closing door 42 are slidably fitted.

[0051] The electric cylinder 62 has a rod 62A that expands and contracts in the vertical direction of the partition wall 130 based on a command signal output from the controller 7. The rod 62A extends downward with respect to the electric cylinder 62 and contracts upward with respect to the electric cylinder 62.

[0052] The connecting bracket 63 is formed by bending an elongated plate member. One end of the bent portion of the connecting bracket 63 is fixed to the tip of the rod 62A of the electric cylinder 62. Also, the other end of the bent portion of the connecting bracket 63 is fixed to the lower end of the opening and closing door 42.

[0053] When the rod 62A of the electric cylinder 62 extends, the opening / closing door 42 is pulled downward by the connecting bracket 63 to the partition wall 130 and enters the "open state". On the other hand, when the rod 62A of the electric cylinder 62 contracts, the opening / closing door 42 is pushed upward by the connecting bracket 63 to the partition wall 130 and enters the "closed state".

[0054] Note that the drive device 6 does not necessarily have to be composed of a pair of slide rails 61, an electric cylinder 62, and a connecting bracket 63, and there are no particular restrictions on the configuration as long as it is an electric device that can be controlled by the controller 7.

[0055] <Configuration of Controller 7> Next, the configuration of the controller 7 will be described with reference to FIG. 11.

[0056] FIG. 11 is a functional block diagram showing the functions of the controller 7.

[0057] The controller 7 is configured such that a CPU, a RAM, a ROM, an HDD, an input I / F, and an output I / F are connected to each other via a bus. The engine key 120 is connected to the input I / F, and the electric cylinder 62 is connected to the output I / F.

[0058] In such a hardware configuration, the CPU reads out a control program (software) stored in a recording medium such as a ROM, an HDD, or an optical disk and expands it onto the RAM, and by executing the expanded control program, the control program and the hardware cooperate to realize the functions of the controller 7.

[0059] In this embodiment, the controller 7 is described as a computer configured by a combination of software and hardware. However, the present invention is not limited to this, and for example, as an example of the configuration of another computer, an integrated circuit that realizes the functions of the control program executed on the side of the wheel loader 1 may be used.

[0060] As shown in FIG. 11, the controller 7 includes a storage unit 70, a data acquisition unit 71, an opening / closing door state determination unit 72, an operation time measurement unit 73, an operation time determination unit 74, and a signal output unit 75.

[0061] The data acquisition unit 71 acquires operation signals (engine key ON signal and engine key OFF signal) output from the engine key 120.

[0062] When the data acquisition unit 71 acquires the engine key ON signal, that is, when the engine 311 starts, the opening / closing door state determination unit 72 determines the open / closed state of the opening / closing door 42. The determination of the open / closed state of the opening / closing door 42 in the opening / closing door state determination unit 72 is performed based on the command signal output by the signal output unit 75 last time (immediately before). The content of the command by the signal output unit 75 is stored in the storage unit 70.

[0063] When the data acquisition unit 71 acquires the engine key ON signal, the operation time measurement unit 73 starts measuring the operation time T of the engine 311. Then, when the data acquisition unit 71 acquires the engine key OFF signal, that is, when the engine 311 stops, the operation time measurement unit 73 ends the measurement of the operation time T of the engine 311.

[0064] The operation time determination unit 74 determines whether the operation time T of the engine 311 measured by the operation time measurement unit 73 is equal to or greater than a predetermined threshold value Tth. Here, the "predetermined threshold value Tth" is set to about 20 minutes, for example, and corresponds to a time that can be used to determine that the wheel loader 1 has operated to perform work. The predetermined threshold value Tth is set in advance and stored in the storage unit 70.

[0065] Therefore, if the operation time T is equal to or greater than the predetermined threshold value Tth, it can be determined that the wheel loader 1 has performed work. In this case, since heat is generated from the engine 311 and the inside of the engine room 31 becomes high temperature, it is necessary to open the opening / closing door 42 to expose the opening 41.

[0066] On the other hand, if the operating time T is less than a predetermined threshold value Tth, it can be determined that the wheel loader 1 was not in a working state. This applies, for example, when the operator accidentally turns on the engine key 120 and then hurriedly turns it off, or when work is scheduled on the wheel loader 1 and the operator turns on the engine key 120, but the work schedule is changed and the operator turns off the engine key 120 in a short time. In this case, since less heat is generated from the engine 311 as the temperature inside the engine room 31 rises, there is no need to open the opening 41 by opening the opening / closing door 42.

[0067] When the data acquisition unit 71 acquires the engine key ON signal and the opening / closing door state determination unit 72 determines that the opening / closing door 42 is open, the signal output unit 75 outputs a closing command signal for closing the opening / closing door 42 to the electric cylinder 62 (drive device 6).

[0068] Also, when the data acquisition unit 71 acquires the engine key OFF signal and the operating time determination unit 74 determines that the operating time T is equal to or greater than a predetermined threshold value Tth (T≧Tth), the signal output unit 75 outputs an opening command signal for opening the opening / closing door 42 to the electric cylinder 62 (drive device 6).

[0069] In this embodiment, the controller 7 includes the operating time measurement unit 73 and the operating time determination unit 74, but these functions are not necessarily required. As long as the signal output unit 75 outputs an opening command signal to the electric cylinder 62 at least when the data acquisition unit 71 acquires the engine key OFF signal.

[0070] <Processing executed by the controller 7> Next, the flow of the process executed in the controller 7 will be described with reference to FIG. 12.

[0071] FIG. 12 is a flowchart showing the flow of the process executed by the controller 7.

[0072] In the controller 7, first, when the data acquisition unit 71 acquires the engine key ON signal output from the engine key 120 (step S701), the operation time measurement unit 73 starts measuring the operation time T of the engine 311 (step S702).

[0073] Subsequently, the opening / closing door state determination unit 72 determines whether or not the opening / closing door 42 is in a closed state based on the opening / closing state of the opening / closing door 42 stored in the storage unit 70 (step S703).

[0074] If it is determined in step S703 that the opening / closing door 42 is in a closed state (step S703 / YES), and when the data acquisition unit 71 acquires the engine key OFF signal output from the engine key 120 (step S704), the operation time measurement unit 73 ends the measurement of the operation time T of the engine 311 (step S705).

[0075] On the other hand, if it is determined in step S703 that the opening / closing door 42 is in an open state (step S703 / NO), the signal output unit 75 outputs a closing command signal to the electric cylinder 62 (step S703A), and proceeds to step S704.

[0076] Next, the operation time determination unit 74 determines whether or not the operation time T measured in step S705 is equal to or greater than a predetermined threshold value Tth (step S706).

[0077] If it is determined in step S706 that the operation time T is equal to or greater than the predetermined threshold value Tth (T≧Tth) (step S706 / YES), the signal output unit 75 outputs an opening command signal to the electric cylinder 62 (step S707), and the processing in the controller 7 ends.

[0078] On the other hand, if it is determined in step S706 that the operation time T is less than the predetermined threshold value Tth (T<Tth) (step S706 / NO), the processing in the controller 7 ends with the opening / closing door 42 remaining in the closed state.

[0079] In this way, by the controller 7 controlling the opening and closing of the opening / closing door 42 according to the operating state of the engine 311, the temperature in the engine room 31 can be efficiently reduced. Further, for the opening / closing control of the opening / closing door 42, for example, it is conceivable to provide a temperature sensor in the engine room 31 and perform the control according to the ambient temperature in the engine room 31. However, according to the present embodiment, it is not necessary to provide a temperature sensor in the engine room 31. Thereby, an increase in the number of components to be mounted on the wheel loader 1 can be suppressed, and a failure of the temperature sensor due to providing the temperature sensor in the engine room 31 that becomes high temperature during the operation of the engine 311 and a malfunction of the opening / closing door 42 due to the failure of the temperature sensor can be avoided.

[0080] Furthermore, the engine room 31 communicates with the cooler room 32 through the opening 41 provided in the partition wall 130 installed in the building 13, and the building 13 is opened to the outside through each ventilation port 132A of the cooler room 32. Since the engine room 31 is not directly opened to the outside, external substances such as rainwater and dust can be prevented from entering the engine room 31, and the temperature in the engine room 31 can be reduced after the engine 311 stops.

[0081] The embodiments of the present invention have been described above. It should be noted that the present invention is not limited to the above-described embodiments and includes various other modifications. For example, the above-described embodiments have been described in detail for easy understanding of the present invention, and are not necessarily limited to those having all the configurations described. Also, a part of the configuration of the above-described embodiment can be replaced with the configuration of another embodiment, and the configuration of another embodiment can be added to the configuration of the above-described embodiment. Furthermore, for a part of the configuration of the above-described embodiment, addition, deletion, or replacement with other configurations is possible.

[0082] For example, in the above embodiment, the wheel loader 1 is cited as an example of one aspect of the working machine, but it is not limited thereto, and other working machines such as a hydraulic excavator may be used.

Explanation of Reference Numerals

[0083] 1: Wheel loader (working machine) 1A: Front frame (vehicle body) 1B: Rear frame (vehicle body) 6: Drive device 7: Controller 31: Engine room 32: Cooler room 41: Opening 42: Opening / closing door (opening / closing member) 130: Partition wall 131: Ceiling cover 132: Side cover 132A: Ventilation port part 133: Rear cover 311: Engine 312: Aftertreatment device 313: Support bracket (support member) T: Operating time Tth: Predetermined threshold value

Claims

1. A vehicle body, An engine room provided in the vehicle body and housing an engine therein, A cooler room provided in the vehicle body, housing a heat exchanger therein, and having a ventilation port through which outside air enters and exits, A partition wall that separates the engine room and the cooler room in the front-rear direction of the vehicle body, In a working machine equipped with, An opening formed in the partition wall that communicates the inside of the engine room and the inside of the cooler room, An opening / closing member provided so as to be changeable between an open state in which the opening is opened and a closed state in which the opening is closed, A drive device that switches the opening / closing state of the opening / closing member, A controller that controls the drive device, and has, The controller, When the engine is started, outputs a closing command signal for setting the opening / closing member to the closed state to the drive device, When the engine stops, outputs an opening command signal for setting the opening / closing member to the open state to the drive device A working machine characterized by this.

2. In the working machine according to Claim 1, Inside the engine room, A post-treatment device for purifying the exhaust gas discharged from the engine is further housed, The post-treatment device, Is supported by a support member from below above the engine, The upper end of the opening, Is located above the support member A working machine characterized by this.

3. In the working machine according to Claim 1, The opening / closing member, Opens and closes in the vertical direction with respect to the opening A working machine characterized by this.

4. In the working machine according to Claim 1, The cooler room, The partition wall, A rear cover that is arranged opposite to the partition wall and covers the rear, A ceiling cover that covers the upper part, Is defined by a pair of side covers that cover both sides in the left-right direction of the vehicle body, The ventilation port is formed in at least one of the pair of side covers, The lower end of the opening, Is located below the uppermost end of the ventilation port A working machine characterized by this.

5. In the working machine according to Claim 1, The controller, Measures the operating time of the engine from when the engine is started until it stops, When the engine stops and the measured operating time is equal to or greater than a predetermined threshold value, outputs the opening command signal to the drive device A working machine characterized by this.

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