JP2018172862A - Work machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a work machine capable of confirming a clear image of a camera in an driver's cab by suppressing dirt on an objective surface of a camera for monitoring the surroundings of a vehicle body. A hydraulic pump in which an engine 13, a hydraulic pump driven by the engine 13, a heat exchanger 15 for cooling engine cooling water, a fan 17 for generating cooling air for cooling the heat exchanger 15, and the like are housed in a power chamber 7. The camera device 20 is installed on the vehicle body of the excavator 1 to form an air flow path in which the inlet faces the space downstream of the fan 17 in the power chamber 7 and the outlet faces the objective surface of the camera device 20. Since the downstream side of the heat exchanger 15 and the like in the power chamber 7 becomes positive pressure by the action of the fan 17, air flows from the positive pressure region into the air flow path and is injected onto the objective surface of the camera device 20 to form an air curtain. NS. [Selection diagram] Fig. 5

Description

  The present invention relates to a work machine having a work machine attached to a vehicle body, and particularly to a work machine provided with a camera for monitoring the periphery of the vehicle body.

  There may be equipment, dismantled items, work tools, etc. around the work machine such as a hydraulic excavator that operates at the site, and there may be workers. For example, the operator moves the work machine backward or turns it. In addition, it is necessary to grasp the situation around the work machine. On the other hand, there is a work machine in which a camera is installed above the counterweight at the rear end of the revolving unit, and the camera image can be confirmed backward by viewing the image of the camera on a monitor in the cab (see Patent Document 1).

International Publication No. 2014/065211

  For example, hydraulic excavators are used for earth and sand excavation work and building demolition work, so that the operating environment often contains a lot of dust. If dust that flies around adheres to the objective surface of the camera (for example, the objective lens or its cover) or obstructs the camera's field of view, a clear image of the camera cannot be confirmed. As described above, the camera is installed at the upper part of the counterweight having a good view and is located at a very high position, and it requires labor to access and clean from the ground.

  An object of the present invention is to provide a work machine capable of suppressing the contamination of the objective surface of a camera that monitors the surroundings of a vehicle body and confirming a clear image of the camera in a cab.

  In order to achieve the above object, the present invention provides a vehicle body having a driver's cab and a power chamber disposed on the rear side of the driver's cab, a work machine provided at a front portion of the vehicle body, and a surrounding installed in the vehicle body. A monitoring camera is provided, and a prime mover, a hydraulic pump driven by the prime mover, a heat exchanger that cools the cooling water of the prime mover, and a fan that generates cooling air that cools the heat exchanger are accommodated in the power chamber. In the working machine, an entrance faces the downstream space of the fan in the power chamber, an exit faces the objective surface of the surrounding monitoring camera, and the downstream side of the heat exchanger inside the power chamber by the function of the fan. And an air flow path formed so that air flows from the positive pressure region and is jetted onto the object plane of the surrounding monitoring camera.

  According to the present invention, air flows into the air flow path from the inside of the power chamber that becomes positive pressure, and is ejected to the front surface of the objective surface of the surrounding monitoring camera to form an air curtain. As a result, contamination of the objective surface of the surrounding monitoring camera can be suppressed, and a clear image of the camera can be confirmed in the cab.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a side view illustrating an external configuration of a crawler hydraulic excavator that is a representative example of a work machine according to the present invention. It is the perspective view which looked at the power chamber of the working machine which concerns on 1st Embodiment of this invention, and the element of the vicinity from the left back. It is a top view showing the power chamber of the working machine which concerns on 1st Embodiment of this invention, and the element of the vicinity. It is the perspective view which removed the engine cover of the working machine which concerns on 1st Embodiment of this invention, and looked at the inside of a motive power chamber from the right front. It is sectional drawing of the rear part of the turning body of the working machine which concerns on 1st Embodiment of this invention. It is a top view showing the power chamber of the working machine which concerns on 2nd Embodiment of this invention, and the element of the vicinity. It is a top view showing the power chamber of the working machine which concerns on 3rd Embodiment of this invention, and the element of the vicinity.

  Embodiments of the present invention will be described below with reference to the drawings.

(First embodiment)
Work Machine FIG. 1 is a side view showing an external configuration of a crawler hydraulic excavator that is a typical example of a work machine according to the present invention. When there is no notice in the following description, the front of the driver's seat (the left direction in the figure) is the front of the aircraft. However, the illustration of the crawler type excavator is not intended to limit the application target of the present invention, and any other type of machine such as a crane, a wheel loader, a wheel type excavator can be used as long as it is a work machine with a work machine attached to the vehicle body. The present invention can also be applied to a work machine.

  A hydraulic excavator 1 shown in FIG. 1 includes a vehicle body having a traveling body 2 and a revolving body 3, and a work machine (front work machine) 4. The traveling body 2 is a lower structure for allowing the work machine to travel on its own, and is of a crawler type having left and right crawler belts. The swivel body 3 includes a swivel frame 5, a driver's cab 6, a power cab (building cover) 7, a counterweight 9, and the like that form a support structure. The turning frame 5 is provided on the upper part of the traveling body 2 via a turning wheel so as to be turnable. The cab 6 is disposed on the upper left part of the front part of the revolving frame 5. Although not shown, a driver's seat where an operator sits, various operation devices operated by the operator, a monitor device, and the like are arranged in the cab 6. The counterweight 9 is a weight that balances the weight of the work machine 4 and is provided at the rear end of the upper part of the revolving frame 5. A power chamber 7 is disposed between the counterweight 9 and the cab 6. The work machine 4 is an articulated work arm for performing excavation work of earth and sand, and is attached to the front part of the swivel frame 5 (on the right side of the cab 6). The work machine 4 includes a boom connected to the revolving frame 5, an arm connected to the tip of the boom, and a bucket connected to the tip of the arm. The boom, arm, and bucket rotate via a shaft extending in the left-right direction, and the work implement 4 operates along a vertical plane extending in the front-rear direction.

Power chamber FIG. 2 is a perspective view of the power chamber of the revolving structure and the elements in the vicinity thereof, as viewed from the left rear, FIG. 3 is a plan view thereof, and FIG. 4 is a plan view of the engine. FIG. FIG. 4 shows a state where the engine 13, the hydraulic pump, the fan 17 and the like are removed.

  Inside the power chamber 7, devices such as an engine 13, a hydraulic pump, a heat exchanger 14-16, and a fan 17 are accommodated. The engine 13 is a prime mover, and is disposed in the center of the power chamber 7 with a posture in which the rotation shaft extends to the left and right. An electric motor may be used as a prime mover instead of the engine 13. The hydraulic pump is driven by the engine 13 and discharges the pressure oil that drives the hydraulic actuator. In this embodiment, the hydraulic pump is disposed on the right side of the engine 13 and below the muffler 18 of the engine 13. The heat exchanger 14 is an oil cooler that cools hydraulic oil, the heat exchanger 15 is a radiator that cools engine coolant, and the heat exchanger 16 is an intercooler that lowers the combustion temperature of exhaust gas to reduce nitrogen oxides. In the present embodiment, the heat exchangers 14-17 are arranged side by side in a posture with their wide surfaces facing left and right, and are arranged in parallel with the flow of cooling air in the power chamber 7. The fan 17 is driven by the engine 13 to generate cooling air that cools the heat exchanger 14-16. In this embodiment, the fan 17 is disposed between the engine 13 and the heat exchanger 14-16 on the left side of the engine 13. ing. The fan 17 and the heat exchanger 14-16 are connected by a duct 17a. The cooling air generated by the fan 17 flows from the left side to the right side in FIG. A filter 19 is disposed on the upstream side (the left side in FIG. 3) of the heat exchanger 14-16, and dust accompanying the air sucked into the power chamber 7 is collected by the filter 19.

  The power chamber 7 includes left and right side plates 7a and a top plate 7b. The side plate 7a stands along a vertical plane extending in the front-rear direction, and the top plate 7b extends between the upper portions of the left and right side plates 7a. As shown in FIG. 3 and the like, the left side plate 7a is provided with a plurality of air inlets (slits in this example) for taking outside air into the power chamber 7. The upper surface plate 7b has a large opening at the center, and an engine cover 8 is provided in the opening so as to be opened and closed. When the engine cover 8 is removed, devices that require regular maintenance such as the engine 13 and the heat exchanger 14-16 can be accessed from the opening of the upper surface plate 7b. A valve chamber containing a control valve or the like is disposed on the front side of the power chamber 7, and the valve chamber is partitioned by a cover 7c. The rear side of the power chamber 7 is closed by the front surface 9 a of the counterweight 9.

Camera FIG. 5 is a cross-sectional view of the rear part of the revolving unit cut along a vertical plane extending back and forth through the revolving center. As can be seen with reference to FIGS. 1 to 4, the camera device 20 is installed on the vehicle body (in this embodiment, the upper part of the counterweight 9 which is the rear end of the vehicle body). The camera device 20 is a surrounding monitoring camera that photographs the surroundings of the vehicle body. The camera device 20 of the present embodiment is particularly a rear monitoring camera, which captures the rear of the revolving structure 3 and outputs an image to a monitor device inside the cab 6.

  Here, as shown in FIG. 5 and the like, the counterweight 9 is formed with a recess 9b at the center in the left-right direction at the top. The recess 9b extends in the front-rear direction, and the upper side and the front side are open. The front opening of the recess 9 b opens to the front surface 9 a of the counterweight 9 and faces the internal space of the power chamber 7. The cross section of the recessed part 9b cut | disconnected by the vertical surface extended right and left is a rectangular shape. The upper opening of the recess 9 b is closed by a camera bracket 10 attached to the upper surface of the counterweight 9.

  The camera device 20 includes a base frame 21, a camera housing 22, and a camera body 23, and is installed at a position corresponding to the concave portion 9 b, that is, a central position in the left-right direction on the upper surface of the counterweight 9.

  The base frame 21 is a fixing plate for fixing to the counterweight 9 (strictly speaking, the camera bracket 10). The front portion of the base frame 21 is covered with the engine cover 8, and the base frame 21 is sandwiched between the upper surface plate 7 b of the power chamber 7 and the engine cover 8. The base frame 21 cannot be removed or tilted unless the engine cover 8 is removed. The base frame 21 is provided with a vent 21a (FIG. 5). The vent 10a (FIG. 5) is also provided at a position corresponding to the vent 21a of the camera bracket 10. In addition, the base frame 21 is provided with a through hole (not shown) for passing a harness 23 a (FIG. 5) extending from the camera body 23. The harness 23a is connected to a monitor device (not shown) in the cab 6 or a control device that controls display output of the monitor device through the through hole or the like and the recess 9b. The camera body 23 is, for example, a CCD camera.

  The camera housing 22 is formed in a hollow box shape by a lower housing 22a and an upper housing 22b. The lower housing 22a is fixed to the base frame 21 with bolts or the like, and supports the camera body 23. A window (not shown) is opened at the rear of the lower housing 22a, and the objective surface (objective lens or its cover) of the camera body 23 faces the window. The camera body 23 is arranged so as to take a picture of the rear of the revolving unit 3 from the window. The space between the objective surface of the camera body 23 and the window is sealed. The upper housing 22b is mounted on the upper part of the lower housing 22a and covers the upper part of the camera body 23.

  A vent 22c is provided at the front of the lower housing 22a at a position corresponding to the vents 21a and 10a. Furthermore, a minute opening 22d is provided on the mating surface of the lower housing 22a and the upper housing 22b. Except for the minute opening 22d, the upper housing 22b and the lower housing 22a are sealed. In the present embodiment, the minute opening 22d is located above the objective surface of the camera body 23 and opens in the direction toward or along the objective surface. However, the minute opening 22d may be on the left side, the right side, or the lower side of the objective surface of the camera body 23 as long as it opens in the direction toward or along the objective surface. The minute opening 22d may be a slit-like opening extending in the left-right direction, or a plurality of openings arranged in the left-right direction. Thus, the internal space of the camera housing 22 defined by the lower housing 22a and the upper housing 22b is connected to the internal space of the power chamber 7 through the vent holes 22c, 21a, 10a and the recess 9b, and the vehicle body through the minute opening 22d. Connected to external space. The recess 9b, the vents 10a, 21a, 22c, the internal space of the camera housing 22, and the minute opening 22d are air in which the inlet faces the space downstream of the fan 17 in the power chamber 7 and the outlet faces the objective surface of the camera device 20, respectively. A flow path is formed. As will be described later, the downstream side of the fan 17 and the heat exchanger 14-16 in the power unit 7 becomes a positive pressure region, and air flows into the air flow path from the positive pressure region in the power chamber 7 so that the camera Injected onto the object plane of the apparatus 20.

(Operation)
When operating the excavator 1, the operator gets into the cab 6 and sits in the driver's seat. By operating the lever of the traveling operation device in this state, the traveling body 2 is driven and the excavator 1 moves forward or backward. Further, by operating the lever of the operating device corresponding to the operation of the work machine 4 and the turning operation of the swivel body 3, the work machine 4 and the swivel body 3 can be driven to perform excavation work of earth and sand.

  During the traveling operation, the turning operation, and the like, the rear of the turning body 3 that is the blind spot of the operator in the cab 6 is photographed by the camera device 20. The video image | photographed with the camera apparatus 20 is displayed on the monitor apparatus arrange | positioned in the cab 6 in real time. The operator can operate the hydraulic excavator 1 while appropriately confirming the rear of the revolving structure 3 based on the image displayed on the monitor device.

  At this time, outside air is sucked into the power chamber 7 by the fan 17 driven by the engine 13 through the intake port of the left side plate 7a as cooling air. The cooling air passes through the filter 19 to remove dust and the like, then flows rightward inside the power chamber 7 and cools the heat exchanger 14-16, the engine 13, the hydraulic pump, the muffler 18 and the like, and then the power chamber 7 It is discharged from the exhaust port. During operation of the engine 13, the inside of the power chamber 7 becomes positive pressure by the action of the fan 17, and an air flow is generated in the air flow path described above, and a part of the air inside the power chamber 7 is formed in the recess 9 b or the camera housing 22. It ejects from the minute opening 22d through the internal space. The compressed air ejected from the minute opening 22d flows toward or along the objective surface of the camera body 23.

(effect)
Many work machines such as hydraulic excavators have a self-propelled function, but because traveling is not the main purpose, cooling air cannot be taken into the engine room by traveling like an automobile. In addition, since the engine of the work machine is driven around the rated speed, the calorific value is larger than that of the automobile engine. Therefore, a large amount of cooling air must be taken into the power chamber by the fan. As a result, the power chamber has a considerably high pressure (positive pressure) compared to the external pressure. In the present embodiment, this can be utilized to generate an air flow in the air flow path, and a compressed air flow, that is, an air curtain can be formed along the objective surface of the camera body 23. A compressor for forming the air curtain is not necessary. As a result, contamination of the objective surface of the camera device 20 can be suppressed, and as a result, a clear image of the camera device 20 can be confirmed in the cab 6.

  Further, since the air taken into the power chamber 7 passes through the filter 19, the air forming the air curtain is cleaner than the outside air. Therefore, the object surface of the camera apparatus 20 is not contaminated by injecting the air inside the power chamber 7, and the effect of suppressing the object surface of the camera apparatus 20 is highly effective.

  Further, in the present embodiment, air is taken into the internal space of the camera housing 22 using the recess 9b or the like that is a space through which the harness of the camera device 20 passes, and the air is ejected from the minute opening 22d provided in the camera housing 22. A curtain is formed. If only an air curtain is to be formed, an air hose, a nozzle, or the like may be separately piped to blow air onto the objective surface of the camera device 20, but in this embodiment, the appearance is greater than that. Simple and aesthetic. An increase in the number of parts can also be suppressed.

(Second Embodiment)
FIG. 6 is a plan view showing a power chamber of a working machine according to a second embodiment of the present invention and elements in the vicinity thereof. In the figure, elements similar to those in the first embodiment are denoted by the same reference numerals as those in the previous drawings. This embodiment is different from the first embodiment in that it includes a fan 17 that is a positive pressure region inside the power chamber 7 and a duct 25 that connects the downstream portion of the heat exchanger 14-16 and the air flow path. It is a point.

  The duct 25 includes a hood 25a, a duct body 25b, and a flange 25c. The hood 25a is an inlet portion of the duct 25 and opens wider than the duct body 25b toward the fan 17, and contacts or is close to a wind outlet portion of the fan case, which is an outer shell of the fan 17, for example, a fan case It is fixed to. The cooling air is efficiently collected by the hood 25 a and guided to the duct 25. The flange 25c is an outlet portion of the duct 25, and is fixed to the base frame 21 of the camera device 20 or the like so as to maintain a certain airtightness with respect to the inlet (recess 9b) of the air flow path. The duct body 25b connects the hood 25a and the flange 25c. The connection between the duct body 25b and the hood 25a and the connection between the duct body 25b and the flange 25c are kept airtight. Of course, the hood 25a, the duct body 25b, and the flange 25c themselves are also airtight. Except for the addition of the duct 25, the working machine according to the present embodiment is the same as the working machine according to the first embodiment with respect to the other configurations.

  In the present embodiment, the same effect as in the first embodiment can be obtained, but in particular, since the duct 25 is provided, the air flow inlet is located in the highest pressure area immediately downstream of the fan 17. The wind of the curtain is increased, and further improvement of the dirt suppression effect of the camera device 20 can be expected.

(Third embodiment)
FIG. 7 is a plan view showing a power chamber of a work machine according to a third embodiment of the present invention and elements in the vicinity thereof. In the figure, elements similar to those in the first embodiment are denoted by the same reference numerals as those in the previous drawings. This embodiment is different from the first embodiment in that the present invention is applied to a camera device 26 that is a surrounding monitoring camera (side monitoring camera) provided on a side portion of a vehicle body. Although the rear camera device 20 coexists in the present embodiment, the application of the invention to the camera device 20 or the camera device 20 itself may be omitted if unnecessary.

  The structure of the camera device 26 is the same as that of the camera device 20, and is connected to a monitor device in the cab 6 or a control device that controls display of the monitor device via a harness (not shown). In the present embodiment, it is located on the right side (opposite side of the cab 6) of the revolving structure 3 and on the front side of the power chamber 7. In the case of this example, tanks (fuel tank, oil tank, etc.) are arranged at this position, and a hollow case 27 having a certain airtightness is installed in the upper part of the tanks. The camera device 26 fixes the base frame 21 to the upper part of the case 27 and is arranged so that the right side of the swivel body 3 can be seen from above. And the vent 22c (FIG. 5) of the camera housing 22 of the camera apparatus 26 is connected to the internal space of the power chamber 7 via the duct 28 which is an air flow path in this embodiment. The duct 28 has the same structure as the duct 25 of the previous embodiment, and includes a hood 28a, a duct body 28b, and a flange (not shown). The hood 28a opens in a region downstream of the fan 17 in the internal space of the power chamber 7, and is fixed to, for example, a cover 7c that partitions the power chamber 7 and the valve chamber 29 on the front side thereof. The flange is disposed inside the case 27 and is fixed to the case 27, for example. The duct body 28b extends from the hood 28a, passes through the valve chamber 29 on the front side of the power chamber 7, and then comes out above the valve chamber 29 and is inserted into the case 27 and connected to the flange. About another structure, the working machine which concerns on this embodiment, and the working machine which concerns on 1st Embodiment are the same.

  In the present embodiment, when the fan 17 is driven and the inside of the power chamber 7 becomes positive pressure, an air flow is generated in the duct 28, air flows into the camera housing 22 from the vent 22c, and air is ejected from the minute opening 22d. An air curtain is formed along the object plane of the device 26. Needless to say, an air curtain is formed in the camera device 20 as described in the first embodiment. Thus, the present invention can also be applied to the camera device 26 which is a side monitoring camera, and the same effect can be obtained.

DESCRIPTION OF SYMBOLS 1 ... Hydraulic excavator (work machine), 4 ... Work machine, 6 ... Driver's cab, 7 ... Power room, 9b ... Recess (air flow path), 10a ... Vent (air flow path), 13 ... Engine (prime mover), 14-16 ... Heat exchanger, 17 ... Fan, 20 ... Camera device (Ambient monitoring camera, Rear monitoring camera), 21a ... Vent (air channel), 22 ... Camera housing (air channel), 22c ... Vent (Air flow path), 22d ... minute opening (air flow path), 23 ... camera body, 23a ... harness, 25 ... duct, 26 ... camera device (ambient monitoring camera, side monitoring camera), 28 ... duct (air flow) Road)

Claims (5)

A vehicle body having a cab and a power chamber disposed on the rear side of the cab, a working machine provided in a front portion of the vehicle body, and a surrounding monitoring camera installed on the vehicle body, inside the power chamber, In a working machine containing a prime mover, a hydraulic pump driven by the prime mover, a heat exchanger that cools cooling water of the prime mover, and a fan that generates cooling air that cools the heat exchanger,
A positive pressure region that is downstream of the heat exchanger in the power chamber by the action of the fan, with an inlet facing a space downstream of the fan in the power chamber and an outlet facing the objective surface of the surrounding monitoring camera. A work machine comprising an air flow path formed so that air flows from the air and is jetted onto the object plane of the surrounding monitoring camera. The work machine according to claim 1,
The ambient monitoring camera includes a camera body and a camera housing that covers the camera body,
The space through which the harness of the surrounding surveillance camera passes through the positive pressure region inside the power chamber and the internal space of the camera housing form the air flow path, and from the minute opening formed in the camera housing toward the objective surface. A working machine characterized in that air is jetted along or along.   The work machine according to claim 1, further comprising a duct connecting the downstream portion of the fan that is the positive pressure region and the air flow path.   2. The work machine according to claim 1, wherein the surrounding monitoring camera is a rear monitoring camera provided at a rear end of the vehicle body.   2. The work machine according to claim 1, wherein the surrounding monitoring camera is a side monitoring camera provided on a side portion of the vehicle body.

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