JP7272944B2 - work vehicle - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a working vehicle that is equipped with an engine and is driven and driven.

As an example of a work vehicle, a power shovel is conventionally known that includes a traveling device having a pair of left and right crawlers, a vehicle body that is rotatably provided on the traveling device, and a shovel device that is provided at the front of the vehicle body. ing. A typical power shovel is provided with a hydraulic pump that is driven by an engine or an electric motor as a drive source, and a plurality of hydraulic cylinders that are operated by receiving hydraulic oil delivered from the hydraulic pump. A driving device such as a shovel is operated by the hydraulic cylinder to perform excavation work and the like.

Here, there is a problem that it is more difficult to secure a sufficient space for arranging equipment, especially as the work vehicle is smaller. As a result, the cooling performance is degraded due to the dense arrangement of equipment around the engine cooler, which hinders the passage of the cooling air, and the arrangement in which the cooling air heated by the engine passes through the cooler. As a result, there is a problem that the cooling performance deteriorates due to deterioration of the heat exchange efficiency. On the other hand, if an attempt is made to improve the cooling performance, another problem may occur, such as an increase in the size of the cooler and an increase in noise due to an increase in the number of revolutions of the fan.

In order to solve such problems, a working vehicle provided with a cooler and a ventilation structure is disclosed in Patent Document 1 (Japanese Patent Application Laid-Open No. 2004-169518). More specifically, the technical idea is to improve the cooling performance by reducing the ventilation resistance by making the flow path of the cooling air linear.

JP 2004-169518 A

Among working vehicles, particularly small power shovels and the like, there is a need for a configuration in which the rear end portion of the vehicle body protrudes less in order to improve workability in narrow places such as urban areas. Therefore, it is a challenge to achieve both a more efficient equipment arrangement and excellent cooling performance.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and aims to provide a work vehicle that can improve the efficiency of equipment arrangement, improve cooling performance, reduce the size of a cooler, and reduce fan noise. aim.

The present invention solves the above problems by means of solutions as described below.

In the work vehicle according to the present invention, the control device is mounted in the engine room directly above the engine mounting room in which the engine is mounted via the first partition plate whose plate surface is arranged along the horizontal direction. A control device mounting chamber is provided, and the control device mounting chamber guides the cooling air, which is the outside air, to the cooler through an intake opening formed in the peripheral wall of the engine room so as to communicate with the outside. One or a plurality of the intake ports are provided, and all or part of them are at the same height as the engine compartment at the rear door that opens and closes the rear part of the engine compartment. A second partition plate having a plate surface arranged along the vertical direction is provided between the rear door and the engine mounting chamber, and the second partition plate has a stay. It is fixed to the rear door via the rear door and moves with the opening and closing of the rear door, and the upper end is in close contact with the rear end of the first partition plate without a gap when the rear door is closed. Alternatively, it is required that they are arranged so as to be close to each other with a minute gap .

According to the present invention, it is possible to increase the density of the equipment arrangement and save the space. It is possible to solve the problem that the heat exchange efficiency deteriorates due to the cooling air passing through the cooler, and to achieve both the miniaturization of the vehicle and the improvement of the cooling performance of the cooler.

1 is a perspective view showing an example of a working vehicle according to an embodiment of the present invention; FIG. 1 is an enlarged view showing an example of an engine room of a working vehicle according to an embodiment of the present invention; FIG. It is an explanatory view for explaining the composition of the 1st partition plate of the work vehicle concerning the embodiment of the present invention. 1 is a side cross-sectional view showing an example of an engine room of a working vehicle according to an embodiment of the present invention; FIG.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a schematic diagram (perspective view from above the rear portion) showing an example of a work vehicle 1 according to the present embodiment. FIG. 2 is an enlarged view mainly showing the engine room 20 portion of the work vehicle 1 shown in FIG. 1 (the rear door 40 is "open"). It should be noted that some of the constituent elements may be omitted in order to make the drawings easier to understand. For convenience of explanation, the arrows in the drawings may indicate the up-down, left-right, and front-rear directions of the work vehicle 1 . Further, in all the drawings for explaining the embodiments, members having the same functions are denoted by the same reference numerals, and repeated description thereof may be omitted.

First, the overall configuration of the working vehicle 1 will be described. Here, a power shovel that travels with crawlers (endless crawler belts) will be described as an example, but the invention is not limited to this.

As shown in FIG. 1 , the work vehicle 1 includes a traveling device 12 having a pair of left and right crawlers 30 , a vehicle body 10 provided on the traveling device 12 so as to be able to turn, and a It is configured to include a driving device (shovel device 16, blade device 18, etc.). However, the traveling device 12 is not limited to a pair of left and right crawlers, and may be configured to include a pair of left and right tires (not shown). It should be noted that the configuration may be such that the engine and the battery are used together to drive the traveling device or the like (not shown).

An operator control room 14 (a closed cabin is illustrated, but an open canopy (not shown) may be used) in which an operator (worker) rides in the center of the vehicle body 10 to operate the vehicle. is provided, and an engine room 20 in which an engine 8 for driving the traveling device and the like is mounted is provided in the rear portion. More specifically, as shown in FIG. 2, an engine mounting room 6 in which the engine 8 is mounted is provided within the engine room 20 . In this engine mounting chamber 6, for example, the engine 8 is mounted with the crankshaft extending in the left-right direction, and a cooler 42 for cooling the engine 8 (here, cooling is performed by circulating coolant between the engine 8 and the engine 8). radiator) is disposed at the right end of the vehicle body 10 . Here, in the present embodiment, a fan 44 for the cooler 42 that blows air for cooling the cooler 42 (coolant) is arranged between the engine 8 and the cooler 42. By rotating the fan 44, the cooling air led from the intake port 50 to the fan 44 is made to pass through while hitting the cooler 42, and is exhausted from the exhaust port 58 to the outside of the vehicle. At this time, the cooler 42 performs heat exchange, that is, cooling of the coolant. The driving force of the fan 44 may be obtained either from the engine or from a battery (that is, an electric fan).

Next, the operator control room 14 displays a seat on which the operator sits, various operation levers and operation switches for operating the traveling device 12 and the drive devices 16 and 18, and various vehicle information. It is configured with a display device and the like that

Next, driving devices such as the shovel device 16 and the blade device 18 will be described. First, the shovel device 16 includes a boom 22 pivotally connected to the front part of the vehicle body 10 so as to be able to swing vertically, an arm 24 pivotally connected to the tip of the boom 22 so as to be able to swing vertically, and the tip of the arm 24. and a bucket 26 that is pivotally connected to the . A hydraulically driven boom cylinder (not shown) is provided across the front portion of the vehicle body 10 and the boom 22, and the boom 22 is swung by the boom cylinder. A hydraulically driven arm cylinder 34 is provided across the boom 22 and the arm 24 , and the arm 24 is swung by the arm cylinder 34 . A hydraulically driven bucket cylinder 36 is provided across the arm 24 and the bucket 26 , and the bucket 26 is swung by the bucket cylinder 36 .

On the other hand, the blade device 18 includes a blade 28 pivotally connected to the front portion of the traveling device 12 so as to be vertically swingable. A hydraulically driven blade cylinder 38 is provided across the front portion of the travel device 12 and the blade 28 , and the blade 28 is swung by the blade cylinder 38 .

A mechanism for driving each cylinder described above is composed of, for example, a hydraulic pump driven by the engine 8, a control valve, and the like (none of which is shown). Control valves are operated according to the operation of the operator, and control is performed to supply hydraulic oil sent from the hydraulic pump to each cylinder. As a result, the bucket 26 and the blades 28 can operate as desired to perform work such as excavation. In addition, a turning hydraulic motor (not shown) that turns the vehicle body 10 is provided as a driving device driven by hydraulic oil sent from a hydraulic pump, and the vehicle body 10 turns horizontally according to the operation of the operator. A device is provided.

In the work vehicle 1 having such a configuration, control is performed using the control device 46 when traveling and driving. However, since this 46 incorporates heat-sensitive components, it is preferable to mount it in a place where it is not damaged by heat from the engine 8. Therefore, especially in a small working vehicle 1, Problems such as difficulty in finding mounting space and an increase in the size of the vehicle structure have arisen.

The work vehicle 1 according to the present embodiment has the following characteristic configuration to solve this problem. Specifically, an engine room 6 in which the engine 8 is mounted is provided inside an engine room 20 whose basic structure is configured as one space. is provided in the control device mounting chamber 4 (this also includes a configuration in which part of the mechanism of the control device 46 is distributed to another location). Here, between the engine mounting chamber 6 and the control device mounting chamber 4, there is a first partition plate 48 whose plate surface is arranged along the horizontal direction (the meaning is not limited to strictly "horizontal"). is provided. In addition, the first partition plate 48 is configured using a plate material made of a metal material.

Further, the control device mounting chamber 4 is also configured to serve as a cooling air flow path for guiding the cooling air taken in from an intake port 50 formed in the peripheral wall portion of the engine room 20 so as to communicate with the outside, to the cooler 42 . It's becoming

As described above, since the control device 46 is vulnerable to heat, a configuration in which it is arranged directly above the engine mounting compartment 6 , that is, the engine 8 has not been conventionally adopted. However, according to the above configuration according to the present embodiment, the heat from the engine 8 can be shielded by the first partition plate 48, and the control device mounting chamber 4 itself is used as a cooling air flow path to flow the cooling air. Therefore, it is possible to reduce the room temperature of the control device mounting room 4 and cool the control device 46 . These synergistic actions make it possible to provide the control device mounting room 4 directly above the engine mounting room 6 and to mount the control device 46 in the control device mounting room 4 without suffering heat damage.

Furthermore, since it is possible to use the space immediately above the engine 8 in the engine room 20, which tends to be dead space, as a control device mounting room 4 and as a cooling air flow path, the efficiency of equipment arrangement (specifically In particular, in a small working vehicle 1, it is possible to realize a configuration in which the rear end portion of the vehicle body 10 protrudes less.

Until now, there has been a problem that the smaller the working vehicle, the more difficult it is to secure a sufficient space for arranging equipment. As a result, the cooling performance is degraded due to the dense arrangement of equipment around the engine cooler, which hinders the passage of the cooling air, and the arrangement in which the cooling air heated by the engine passes through the cooler. As a result, the cooling performance deteriorates due to deterioration in heat exchange efficiency. On the other hand, according to the work vehicle 1 according to the present embodiment, by providing the above-described configuration, it is possible to realize equipment arrangement that has been difficult to adopt so far, and increase the density of equipment and save space. It is possible to plan In addition, it is possible to prevent the occurrence of situations where cooling air flow is blocked or the cooling air is heated by the heat of the engine, which can occur as a demerit of concentrating equipment and saving space, thereby preventing a decline in cooling performance. becomes. As a result, compared with conventional work vehicles, it is possible to reduce the size of the cooler without changing the number of revolutions of the fan, thereby reducing costs and saving space. Alternatively, without changing the size of the cooler, it is possible to lower the number of revolutions of the fan to reduce noise. Of course, it is also possible to obtain both functions and effects in a well-balanced manner.

Here, the detailed configuration of the first partition plate 48 according to this embodiment will be described. As shown in FIG. 2 , the first partition plate 48 is provided with an opening 52 that communicates the engine mounting chamber 6 and the control device mounting chamber 4 . As an example, one opening 52 is provided, but the present invention is not limited to this, and a plurality of openings 52 may be provided.

This opening 52 is configured to allow cooling air to flow from the control device mounting chamber 4 to the engine mounting chamber 6. In addition, the high temperature side coolant hose 54 is inserted from the engine mounting chamber 6 to the control device mounting chamber 4. It is configured to let In this embodiment, the high-temperature side coolant hose 54 that is arranged from the engine mounting chamber 6 to the control device mounting chamber 4 is connected to the upper portion of the cooler 42 via the control device mounting chamber 4. It is connected to a connection port 56 provided, and configured to allow coolant to flow from the engine 8 to the cooler 42 .

According to this, it is possible to construct a flow path for passing the cooling air from the control device mounting chamber 4 which also serves as a cooling air flow path to the fan 44 for the cooler 42 disposed in the engine mounting chamber 6 . Further, by inserting the high-temperature side coolant hose 54 of the coolant hoses that are connected to the engine 8 and the cooler 42 through the opening 52, the cooling air flowing through the coolant hoses causes a high temperature. Since the heat absorption effect from the outer surface of the side coolant hose 54 can be generated, the cooling effect (cooling effect of the coolant) in the cooler 42 can be improved.

Next, the intake port 50 for taking in cooling air (that is, outside air) into the engine room 20 will be described. One or a plurality of intake ports 50 are provided, and all or part of them are provided at the same height as the engine mounting room 6 in the rear door 40 that opens and closes the rear part of the engine room 20 . In this embodiment, a case in which a plurality of intake ports 50 are provided is illustrated. Specifically, the rear door 40 is provided with two air inlets 50 (50A) and two air inlets 50 (50B). Here, the lower intake port 50 (50B) is about the same height as the engine mounting chamber 6, and the upper intake port 50 (50A) is about the same height as the engine mounting chamber 6, or the engine mounting chamber 6 and the control device It is arranged at about the same height as the boundary position with the loading chamber 4 . Furthermore, one intake port 50 (50C) is provided on the left side surface of the engine room 20. As shown in FIG. The intake port 50 (50C) is arranged at about the same height as the control device mounting chamber 4. As shown in FIG.

Here, as a characteristic configuration of the present embodiment, the plate surface is arranged along the vertical direction (the meaning is not limited to strictly "vertical") between the rear door 40 and the engine mounting room 6. A second partition plate 60 is provided (see FIG. 4). More specifically, the second partition plate 60 is fixed to the rear door 40 via a rod-shaped or plate-shaped stay 62 and is configured to move as the rear door 40 is opened and closed. In addition, when the rear door 40 is closed, the upper end portion 60a of the second partition plate 60 and the rear end portion 48a of the first partition plate 48 are in close contact with each other without a gap or close to each other with a minute gap. configured as follows. In the present embodiment, an adhesion improving member (not shown) such as a spacer or packing is interposed to further enhance adhesion. In addition, the second partition plate 60 is configured using a plate material made of a metal material.

According to the above configuration, it is possible to provide the intake port 50 (here, 50A and 50B) also in the rear door 40 where opening and closing operations are performed. Since a large amount of cooling air can be taken in compared to the case where (here, 50C) is not provided, it is possible to prevent a decrease in cooling performance due to an insufficient amount of cooling air.

In addition, a second partition plate 60 is provided between the intake port 50 of the rear door 40 and the engine 8 and is in close contact with or in proximity to the first partition plate 48 . Cooling air can be guided from the port 50 to the control device mounting chamber 4 which also serves as a cooling air flow path.

By the way, in order to perform maintenance on the engine 8, for example, the rear door 40 for opening and closing the engine room 20 as described above is required. In such a case, since it is impossible or difficult to support and fix the rear end portion 48a of the first partition plate 48 by the rear door 40, the problem is how to support and fix it. In addition to this, since the first partition plate 48 is arranged directly above the engine 8, it is necessary to configure the first partition plate 48 itself to be removable when maintenance of the engine 8 is performed.

To solve such a problem, the present embodiment has the following configuration. Specifically, the rear end portion 48a of the first partition plate 48 passes through the engine room 20 along the vertical direction (the meaning is not limited to strict "vertical" only) for supporting the operator cockpit 14 and the like. It is fixed to the floor frame 64 provided so as to be detachable by bolting (see FIG. 2). A front end portion 48b of the first partition plate 48 is detachably fixed by bolting to a partition wall 66 provided at the boundary between the operator cockpit 14 and the engine room 20 (see FIG. 3). . Here, FIG. 3 is a view for explaining the fixing structure of the front end portion 48b of the first partition plate 48, and is a perspective view of the partition wall 66 as viewed from the inside of the operator cockpit 14. As shown in FIG. be. In order to make the drawing easier to understand, some of the constituent elements are omitted.

According to this, the structure which supports and fixes the 1st partition plate 48 in the position directly above the engine 8 can be implement|achieved, without using the rear door 40. FIG. Therefore, the rear door 40 can be provided so as to be capable of being opened and closed.

Further, since the first partition plate 48 can be detachably fixed by the floor frame 64 and the partition wall 66, it can be easily removed during maintenance of the engine 8. FIG. Further, since the rear end portion 48a and the front end portion 48b are respectively fixed to the strength members (floor frame 64 and partition wall 66), heavy objects can be placed. As an example, a configuration in which a battery (not shown) is mounted and fixed on the first partition plate 48, that is, a configuration in which the battery is mounted in the controller mounting chamber 4 that also serves as the cooling air flow path can be realized. This makes it possible to further improve the efficiency of equipment arrangement.

So far, the description has focused on the main configuration of the work vehicle 1 according to the present embodiment. Other mechanisms (driving mechanism, control mechanism, etc.) for traveling and working are the same as those of a known working vehicle (here, power shovel), so detailed description thereof will be omitted.

As described above, according to the work vehicle according to the present invention, the arrangement of equipment can be made denser and space-saving, and at the same time, the equipment can be densely arranged around the engine and the cooler so that the cooling air can pass through. and to solve the problem that the cooling air heated by the engine passes through the cooler, which deteriorates the heat exchange efficiency. becomes possible.

It should be noted that the present invention is not limited to the embodiments described above, and can be modified in various ways without departing from the scope of the present invention. In particular, a power shovel has been described as an example of a work vehicle, but the present invention is not limited to this, and can be similarly applied to other work vehicles such as skid steer loaders and crawler carriers. It goes without saying that we can.

1 work vehicle 4 control device installation room/cooling air flow path 6 engine installation room 8 engine 10 vehicle body 12 travel device 14 operator cockpit 16 excavator device 18 blade device 20 engine room 40 rear door 42 cooler 44 fan 46 control device 48 1 partition plate 50, 50A, 50B, 50C intake port 52 opening 54 high temperature side coolant hose 56 connection port 58 exhaust port 60 second partition plate 62 stay 64 floor frame 66 partition wall

Claims (3)

In the engine room, directly above the engine mounting chamber in which the engine is mounted, a control device mounting chamber in which the control device is mounted is provided via a first partition plate whose plate surface is arranged along the horizontal direction,
The control device mounting chamber is configured to be also used as a cooling air flow path for guiding cooling air , which is outside air, taken in from an intake opening formed in the peripheral wall portion of the engine room so as to communicate with the outside, to a cooler. ,
One or a plurality of the air intake ports are provided, and all or part of them are provided at the same height as the engine mounting room in a rear door that opens and closes the rear part of the engine room,
A second partition plate having a plate surface arranged along a vertical direction is provided between the rear door and the engine mounting chamber,
The second partition plate is fixed to the rear door via a stay and is configured to move as the rear door is opened and closed, and an upper end portion of the second partition plate separates the first partition when the rear door is closed. It must be placed in close contact with the rear end of the plate without any gap or close to it with a small gap.
A work vehicle characterized by: The first partition plate has an opening that communicates the engine mounting chamber and the control device mounting chamber,
The opening is configured to allow the cooling air to flow from the control device mounting chamber to the engine mounting chamber, and to allow the high temperature side coolant hose to pass from the engine mounting chamber to the control device mounting chamber. A working vehicle according to claim 1. The rear end of the first partition plate is detachably fixed by bolting to a floor frame provided for supporting the operator's cockpit and passing through the engine room along the vertical direction, Further, the front end portion is detachably fixed by bolting to a partition wall provided at the boundary between the operator's cockpit and the engine room. Work vehicle as described.

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