JP2021102858A - Working vehicle - Google Patents

Abstract

To provide a working vehicle allowing improvement of equipment arrangement efficiency and cooling capacity to realize downsizing of a cooler and noise reduction of a fan.SOLUTION: A working vehicle 1 in accordance with the present invention has a control device placing room 4 in which a control device 46 is placed, the control device placing room 4 disposed right above an engine placing room 6 in which an engine 8 is placed, in an engine room 20, through a first partition plate 48 with its plate surface along a horizontal direction. The control device placing room 4 is also used as a cooling wind passage that guides cooling wind taken from an intake port 50 opened in the engine room 20 to a cooler 42.SELECTED DRAWING: Figure 2

Description

The present invention relates to a work vehicle equipped with an engine and driven and driven.

As an example of a work vehicle, a power shovel having a traveling device having a pair of left and right crawlers, a vehicle body provided on the traveling device so as to be able to turn, and an excavator device provided on the front portion of the vehicle body has been conventionally known. ing. A general power excavator is provided with a hydraulic pump driven by an engine or an electric motor as a drive source, and a plurality of hydraulic cylinders that operate by receiving hydraulic oil sent from the hydraulic pump. The hydraulic cylinder operates a drive device such as a shovel device to perform excavation work and the like.

Here, there is a problem that it is difficult to secure a sufficient space for arranging the equipment, particularly as the work vehicle is smaller. In addition, along with this, equipment is densely arranged around the engine cooler, which hinders the passage of cooling air, which reduces the cooling performance. Also, the arrangement is such that the cooling air heated by the engine passes through the cooler. There is a problem that the cooling performance is lowered due to the deterioration of the heat exchange efficiency. On the other hand, if an attempt is made to improve the cooling performance, another problem such as an increase in the size of the cooler and an increase in noise due to an increase in the fan rotation speed may occur.

For the purpose of solving such a problem, a work vehicle provided with a cooler and a ventilation structure described in Patent Document 1 (Japanese Unexamined Patent Publication No. 2004-169518) is disclosed. More specifically, it is a technical idea to reduce the ventilation resistance and improve the cooling performance by making the flow path of the cooling air linear.

Japanese Unexamined Patent Publication No. 2004-169518

Among work vehicles, particularly small power shovels and the like are required to have a configuration in which the amount of protrusion at the rear end of the vehicle body is small in order to improve workability in a narrow place such as an urban area. Therefore, it is an issue to achieve both more efficient equipment arrangement and excellent cooling performance.

The present invention has been made in view of the above circumstances, and provides a work vehicle capable of improving the efficiency of equipment arrangement and cooling performance, and realizing miniaturization of a cooler and reduction of fan noise. The purpose.

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 a first partition plate whose plate surface is arranged along the horizontal direction. The control device mounting room is provided, and the control device mounting room is required to have a configuration that is also used as a cooling air flow path for guiding the cooling air taken in from the intake port formed in the engine room to the cooler. To do.

According to the present invention, while realizing the denseness and space saving of the equipment arrangement, at the same time, the equipment is arranged densely around the engine and the cooler, which hinders the passage of the cooling air and is heated by the engine. It is possible to solve the problem that the heat exchange efficiency deteriorates because the cooling air passes through the cooler, and it is possible to achieve both the miniaturization of the vehicle and the improvement of the cooling performance of the cooler.

It is a perspective view which shows the example of the work vehicle which concerns on embodiment of this invention. It is an enlarged view which shows the example of the engine room of the work vehicle which concerns on embodiment of this invention. It is explanatory drawing for demonstrating the structure of the 1st partition plate of the work vehicle which concerns on embodiment of this invention. It is a side sectional view which shows the example of the engine room of the work vehicle which concerns on embodiment of this invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a schematic view (a perspective view from above the rear portion) showing an example of the work vehicle 1 according to the present embodiment. Further, FIG. 2 is an enlarged view centering on the engine room 20 portion of the work vehicle 1 shown in FIG. 1 (the rear door 40 is in the “open” state). In addition, in order to make the figure easy to understand, some of the components may be omitted. Further, for convenience of explanation, arrows in the drawings may indicate the vertical, horizontal, and front-rear directions of the work vehicle 1. Further, in all the drawings for explaining the embodiment, members having the same function may be designated by the same reference numerals, and the repeated description thereof may be omitted.

First, the overall configuration of the work vehicle 1 will be described. Here, a power shovel that runs with a crawler (trackless track) will be described as an example, but the present invention is not limited to this.

As shown in FIG. 1, the work vehicle 1 is fixed to a traveling device 12 having a pair of left and right crawlers 30, a vehicle body 10 provided so as to be able to turn on the traveling device 12, and the vehicle body 10 and the traveling device 12. It is configured to include a drive device (excavator 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 engine and the battery may be used in combination to drive the traveling device or the like (not shown).

Further, in the vehicle body 10, an operator (operator) rides in the center of the vehicle body 10 to operate the operator cockpit 14 (although it is illustrated as a closed cabin, it may be an open canopy (not shown)). Is provided, and an engine room 20 in which an engine 8 for driving a traveling device or the like is mounted is provided at the rear portion. More specifically, as shown in FIG. 2, an engine mounting room 6 in which the engine 8 is mounted is provided in the engine room 20. In the engine mounting chamber 6, for example, the engine 8 is mounted in an arrangement in which the crankshafts are aligned in the left-right direction, and a cooler 42 for cooling the engine 8 (here, a coolant is circulated with the engine 8 for cooling). A radiator) is arranged at the right end of the vehicle body 10. Here, in the present embodiment, the fan 44 for the cooler 42 that blows air for cooling the cooler 42 (cooling liquid) is arranged between the engine 8 and the cooler 42. By rotating the fan 44, the cooling air guided from the intake port 50 to the fan 44 is passed through the cooler 42 while being applied to the cooler 42, and is exhausted from the exhaust port 58 to the outside of the vehicle. At this time, heat exchange, that is, cooling of the coolant is performed in the cooler 42. The driving force of the fan 44 may be either a configuration obtained from an engine or a configuration obtained 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 for operating the operation of the traveling device 12, the driving devices 16, 18 and the like, operation switches, and various vehicle information. It is configured to be equipped with a display device or the like.

Next, drive devices such as the excavator device 16 and the blade device 18 will be described. First, the excavator device 16 includes a boom 22 pivotally connected to the front portion of the vehicle body 10 so as to be vertically swingable, an arm 24 pivotally connected to the tip portion of the boom 22 so as to be vertically swingable, and a tip portion of the arm 24. It is configured to include a bucket 26 that is pivotally connected so as to swing up and down. Further, a hydraulically driven boom cylinder (not shown) is provided straddling the front portion of the vehicle body 10 and the boom 22, and the boom 22 is oscillated by the boom cylinder. Further, a hydraulically driven arm cylinder 34 is provided straddling the boom 22 and the arm 24, and the arm 24 is oscillated by the arm cylinder 34. Further, a hydraulically driven bucket cylinder 36 is provided straddling the arm 24 and the bucket 26, and the bucket 26 is oscillated by the bucket cylinder 36.

On the other hand, the blade device 18 is configured to include a blade 28 pivotally connected to the front portion of the traveling device 12 so as to be vertically swingable. Further, a hydraulically driven blade cylinder 38 is provided straddling the front portion of the traveling device 12 and the blade 28, and the blade 28 is oscillated by the blade cylinder 38.

The mechanism for driving each of the above cylinders includes, for example, a hydraulic pump driven by the engine 8, a control valve, and the like (all not shown). The control valves are operated according to the operation of the operator, and the hydraulic oil delivered from the hydraulic pump is controlled to be supplied to each cylinder. As a result, the bucket 26 and the blade 28 can operate as desired to perform work such as excavation. In addition, as a drive device driven by hydraulic oil sent from a hydraulic pump, a swivel hydraulic motor (not shown) that swivels and drives the vehicle body 10 is provided, and the vehicle body 10 is swiveled horizontally according to an operator's operation. A device is provided.

In the work vehicle 1 having such a configuration, control is performed by using the control device 46 when traveling and driving. However, since it is preferable to mount the 46 in a place where it is not damaged by heat by the engine 8 because components that are sensitive to heat are incorporated, the 46 is particularly used in a small work vehicle 1. There have been problems such as difficulty in finding a mounting space or an increase in the size of the vehicle structure.

The work vehicle 1 according to the present embodiment has the following characteristic configurations to solve this problem. Specifically, an engine mounting chamber 6 in which the engine 8 is mounted is provided inside the engine room 20 in which the basic structure is configured as one space, and the control device 46 is directly above the engine mounting chamber 6. Is provided (note that a configuration in which a part of the mechanism of the control device 46 is distributed and arranged in another place is also included). Here, between the engine mounting chamber 6 and the control device mounting chamber 4, there is a first partition plate 48 in which the plate surface is arranged along the horizontal direction (which is not limited to the strict “horizontal”). It is provided. The first partition plate 48 is made of a plate material made of a metal material.

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

As described above, since the control device 46 is sensitive to heat, conventionally, a configuration in which the control device 46 is arranged directly above the engine mounting chamber 6, that is, the engine 8 has not been 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 allow cooling air to flow. Therefore, it is possible to reduce the indoor temperature of the control device mounting chamber 4 and cool the control device 46. Due to these synergistic actions, the control device mounting chamber 4 can be provided directly above the engine mounting chamber 6, and the control device 46 can be mounted in the control device mounting chamber 4 without being damaged by heat.

Further, since the space directly above the engine 8 in the engine room 20, which tends to be a dead space, can be used as the control device mounting room 4 and the cooling air flow path, the efficiency of equipment arrangement can be improved (specifically). It is possible to increase the density of equipment arrangement, reduce dead space, etc.), and it is possible to realize a configuration in which the amount of protrusion of the rear end portion of the vehicle body 10 is small, particularly in a small work vehicle 1.

Until now, there has been a problem that the smaller the work vehicle, the more difficult it is to secure a sufficient space for arranging the equipment. In addition, along with this, equipment is densely arranged around the engine cooler, which hinders the passage of cooling air, which reduces the cooling performance. Also, the arrangement is such that the cooling air heated by the engine passes through the cooler. Therefore, there is a problem that the cooling performance is lowered due to the deterioration of the heat exchange efficiency. On the other hand, according to the work vehicle 1 according to the present embodiment, by providing the above configuration, it is possible to realize the equipment arrangement that has been difficult to adopt, and to condense the equipment and save space. It becomes possible to plan. Furthermore, it is possible to prevent the occurrence of a state in which the passage of cooling air is obstructed or a state in which the cooling air is heated by the heat of the engine, which may occur as disadvantages of dense equipment and space saving, and prevent deterioration of cooling performance. It becomes. As a result, it is possible to reduce the size of the cooler and reduce the cost and space without changing the fan rotation speed as compared with the conventional work vehicle. Alternatively, it is possible to reduce the noise by lowering the fan rotation speed without changing the size of the cooler. Of course, it is also possible to obtain both effects in a well-balanced manner.

Here, the detailed configuration of the first partition plate 48 according to the present 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.

The opening 52 is configured to allow cooling air to flow from the control device mounting chamber 4 to the engine mounting chamber 6, and 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 you. In the present embodiment, the high temperature side coolant hose 54 arranged from the engine mounting chamber 6 to the control device mounting chamber 4 passes through the inside of the control device mounting chamber 4 and is located above the cooler 42. It is connected to the connection port 56 provided and is configured to allow the coolant to flow from the engine 8 to the cooler 42.

According to this, it is possible to form a flow path for passing the cooling air from the control device mounting chamber 4 which also serves as the cooling air flow path to the fan 44 for the cooler 42 arranged in the engine mounting chamber 6. Further, the high temperature side coolant hose 54 of the coolant hoses connected by communicating the engine 8 and the cooler 42 is inserted into the opening 52, so that the temperature is high due to the cooling air flowing through the opening 52. Since the heat absorbing action from the outer surface of the side coolant hose 54 can be generated, the cooling action (cooling action of the coolant) in the cooler 42 can be improved.

Next, the intake port 50 for taking in the cooling air (that is, the outside air) into the engine room 20 will be described. One or a plurality of intake ports 50 are provided, and all or a part thereof is provided at the same height as the engine mounting chamber 6 at the rear door 40 that opens and closes the rear portion of the engine room 20. In this embodiment, a case where a plurality of intake ports 50 are provided will be illustrated. Specifically, the rear door 40 is provided with two intake ports 50 (50A) and an intake port 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 also about the same height as the engine mounting chamber 6, or the engine mounting chamber 6 and the control device. It is arranged at the same height as the boundary position with the mounting chamber 4. Further, one intake port 50 (50C) is provided on the left side surface of the engine room 20. The intake port 50 (50C) is arranged at about the same height as the control device mounting chamber 4.

Here, as a characteristic configuration of the present embodiment, the plate surface is arranged between the rear door 40 and the engine mounting chamber 6 along the vertical direction (which is not limited to the strict "vertical"). 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 moves as the rear door 40 opens and closes. Further, 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 provided in a shape and arrangement so as to be in close contact with each other or close to each other with a minute gap. It is composed of. In the present embodiment, an adhesion improving member (not shown) such as a spacer and packing is interposed to further enhance the adhesion. The second partition plate 60 is made of a plate material made of a metal material.

According to the above configuration, the intake port 50 (here, 50A, 50B) can also be provided in the rear door 40 where the opening / closing operation is performed. Therefore, for example, the intake port 50 is provided only on one side wall of the engine room 20. Since a large amount of cooling air can be taken in as compared with the case where (50C in this case) is not provided, it is possible to prevent deterioration of cooling performance due to insufficient cooling air volume.

Further, at the position between the intake port 50 of the rear door 40 and the engine 8, the second partition plate 60 which is in close contact with or is close to the first partition plate 48 is provided, so that the intake air is taken in a state where the engine 8 does not heat the intake air. Cooling air can be guided from the port 50 to the control device mounting chamber 4 that also serves as a cooling air flow path.

By the way, in order to perform maintenance on the engine 8, for example, a 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 48a of the first partition plate 48 by the rear door 40, how to support and fix the first partition plate 48 becomes an issue. In addition to this, since the first partition plate 48 is arranged at a position directly above the engine 8, it is an issue to configure the first partition plate 48 so that it can be removed when performing maintenance on the engine 8.

In this embodiment, such a problem is solved by the following configuration. Specifically, the rear end portion 48a of the first partition plate 48 passes through the engine room 20 in the vertical direction (meaning that it is not limited to strictly "vertical") for supporting the operator cockpit 14 and the like. It is fixed to the floor frame 64 so as to be engaged and disengaged by fastening bolts (see FIG. 2). Further, the front end portion 48b of the first partition plate 48 is fixed to the partition wall 66 provided at the boundary between the operator control room 14 and the engine room 20 so as to be engaged and disengaged by fastening bolts (see FIG. 3). .. Here, FIG. 3 is a view for explaining a fixed structure of the front end portion 48b of the first partition plate 48, and is a perspective view of a portion of the partition wall 66 as viewed from the indoor side of the operator cockpit 14. is there. In addition, some of the components are omitted in order to make the figure easier to understand.

According to this, it is possible to realize a configuration in which the first partition plate 48 is supported and fixed at a position directly above the engine 8 without using the rear door 40. Therefore, the rear door 40 can be provided so as to be able to open and close.

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. Further, since the rear end portion 48a and the front end portion 48b are fixed to the strength members (floor frame 64 and partition wall 66), respectively, heavy objects can be placed. As an example, a configuration in which a battery (not shown) is placed and fixed on the first partition plate 48, that is, a configuration in which the battery is mounted in the control device mounting chamber 4 that also serves as a cooling air flow path can be realized. As a result, the efficiency of device arrangement can be further improved.

Up to this point, the main configuration of the work vehicle 1 according to the present embodiment has been mainly described. Since other mechanisms (drive mechanism, control mechanism, etc.) for traveling and work are the same as those of a known work vehicle (here, a power shovel), detailed description thereof will be omitted.

As described above, according to the work vehicle according to the present invention, the equipment is densely arranged and the space is saved, and at the same time, the equipment is densely arranged around the engine and the cooler, and the cooling air passes through. We will try to solve the problem that the heat exchange efficiency deteriorates because the cooling air heated by the engine passes through the cooler, and to achieve both the miniaturization of the vehicle and the improvement of the cooling performance in the cooler. It becomes possible.

The present invention is not limited to the examples described above, and various modifications can be made without departing from the present invention. In particular, the explanation has been given by taking a power shovel as an example of a work vehicle, but the description is not limited to this, and the same applies to other work vehicles such as a skid steer loader and a crawler carrier. Needless to say, you can do it.

1 Work vehicle 4 Control device mounting room / cooling air flow path 6 Engine mounting room 8 Engine 10 Body 12 Traveling device 14 Operator control room 16 Excavator device 18 Blade device 20 Engine room 40 Rear door 42 Cooler 44 Fan 46 Control device 48 No. 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 (4)

In the engine room, a control device mounting room in which the control device is mounted is provided directly above the engine mounting room in which the engine is mounted via a first partition plate whose plate surface is arranged along the horizontal direction.
The control device mounting room is a work vehicle having a configuration that is also used as a cooling air flow path for guiding cooling air taken in from an intake port formed in the engine room to a cooler. The first partition plate has an opening for communicating the engine mounting chamber and the control device mounting chamber.
The opening has a configuration in which the cooling air is allowed to flow from the control device mounting chamber to the engine mounting chamber, and the high temperature side coolant hose is inserted from the engine mounting chamber to the control device mounting chamber. The work vehicle according to claim 1, which is characterized. One or a plurality of the intake ports are provided, and all or a part thereof is provided at the same height as the engine mounting room at the rear door that opens and closes the rear part of the engine room.
A second partition plate whose plate surface is arranged along the 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 moves as the rear door opens and closes, and the upper end portion of the second partition plate is in a state where the rear door is closed. The work vehicle according to claim 1 or 2, wherein the work vehicle is arranged so as to be in close contact with the rear end portion of the plate or close to the rear end portion with a minute gap. The first partition plate is fixed to a floor frame whose rear end is provided so as to pass through the engine room in the vertical direction for supporting the operator's cockpit by fastening bolts. Moreover, any one of claims 1 to 3 characterized in that the front end portion is fixed to the partition wall provided at the boundary between the operator control room and the engine room so as to be engaged and disengaged by fastening bolts. The work vehicle described in item 1.

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