JP2007239364A - Construction machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a construction machine which can enhance the cooling efficiency of a cooler, while keeping the slewing radius of a super structure small. <P>SOLUTION: This construction machinery comprises a counterweight 47 which is erected on a revolving frame 10 in the rear position of the cooler 16, so as to cover the revolving frame 10 in cooperation with a bonnet 11, and a partition plate 26 which is provided between the revolving frame 10 and the bonnet 11, so as to separate the cooler 16 from an engine 14; and the revolving frame 10 is covered with the bonnet 11. Thus, a channel 46, which can introduce outside air toward the rear cooler 16 from between a cab 5 and the engine 14, is formed between the revolving frame 10 and the bonnet 11. The counterweight 47 is provided with a vent hole 47a for discharging the air, guided in the downward direction of the cooler 16 by the operation of a fan 43, in the downward direction of the super structure 3. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a construction machine such as a hydraulic excavator.

  Conventionally, a lower traveling body, an upper swing body that is turnably mounted on the lower traveling body, an attachment that is supported at a substantially central position of a front portion of the upper swing body, and a position where the attachment is supported There is known a construction machine including a cab provided on the upper swing body on the side.

  The upper swing body is provided with an engine and a cooler for cooling the engine coolant, engine oil, and the like at the attachment support position or behind the cab.

  In this type of construction machine, since the engine and the cooler are laid out at the rear of the upper swing body, there is a problem that the upper swing body becomes longer rearward and the swing radius of the rear portion becomes larger.

  Therefore, there is also known a construction machine in which the layout of the engine and the cooler is adjusted to reduce the turning radius of the upper turning body.

  For example, a construction machine is known in which an engine and a cooler are laid out side by side on the side opposite to the cab with respect to the position where the attachment is supported.

  By laying out in this way, the engine and the cooler can be laid out in front of the upper swing body by effectively utilizing the lateral range of the position where the attachment is supported. The turning radius of the rear part of the body can be reduced.

  And the layout like the wheel type excavator of patent document 1 is also known for the purpose of making the turning radius of the rear part of an upper turning body still smaller.

  Specifically, in the wheel-type excavator of Patent Document 1, the radiator is separated from the engine and disposed behind the attachment support position.

  In this wheeled excavator, by arranging the radiator on the side of the engine (behind the attachment support position), the front-rear range when the engine and the radiator are arranged side by side can be reduced by the amount of the radiator. Therefore, the front-rear length of the upper swing body can be further shortened.

In other words, in the layout of Patent Document 1, the engine is disposed forward using the space on the side of the attachment support position, and the radiator is disposed in the space behind the attachment support position, whereby the upper swing body The front and rear length of the can be shortened.
Japanese Utility Model Publication No. 2-54725

  However, in the layout of Patent Document 1, the air heated by the heat of the engine provided in front of the radiator is guided to the rear of the engine when the construction machine is traveling, and part of the air also flows to the radiator. Therefore, even if such a warm air is used as it is to cool the radiator, a sufficient cooling effect cannot be obtained.

  This invention is made | formed in view of the said subject, and it aims at providing the construction machine which can improve the cooling efficiency of a cooler, maintaining the turning radius of an upper turning body small.

  In order to solve the above-mentioned problems, the present invention provides a self-propelled lower traveling body, a revolving frame that is turnably mounted on the lower traveling body, and an upper revolving body including a bonnet that covers the revolving frame, A construction machine comprising an attachment supported in a undulating manner at a substantially central position of a front portion of the swivel frame, and a cab provided on the swivel frame at a side of the position where the attachment is supported, An engine held on the swivel frame on a side opposite to the cab with respect to the attachment support position, and a radiator for cooling cooling water of the engine; and on the swivel frame behind the attachment support position. A retained cooler, a fan capable of forming a flow of air blowing through the radiator from the front to the rear, and a rear position of the cooler A counterweight standing on the swivel frame and covering the swivel frame in cooperation with the bonnet; and an isolation member provided between the swirl frame and the bonnet to isolate the cooler from the engine. The swirl frame is covered with a bonnet so that a flow path is formed between the swirl frame and the bonnet so that outside air can be introduced from between the cab and the engine toward the rear cooler. In addition, the counterweight is provided with a construction machine that is formed with a vent hole for discharging the air guided to the rear of the cooler by the operation of the fan to the rear of the upper swing body. .

  According to the present invention, the flow path through which the outside air can be introduced from between the cab and the engine toward the rear cooler is formed between the swivel frame and the bonnet, and the outside air thus introduced is Since the counterweight is formed with a vent opening that discharges to the rear of the upper swing body, air flowing from the front to the rear according to the operation of the fan is provided between the swing frame and the bonnet (that is, inside the upper swing body). A flow can be formed.

  And in this invention, since the isolation member which isolate | separates a cooler from an engine is provided, even if the construction machine is driving | running, it suppresses that the air warmed by the engine flows into the cooler side. It is possible to prevent the warmed air from being mixed into the air flow in the front-rear direction described above.

  Therefore, according to the present invention, the outside air can be supplied to the cooler without destroying the layout in which the engine is disposed on the side of the attachment support position and the cooler is disposed behind the attachment support position. The cooling efficiency of the cooler can be improved while maintaining the layout advantage of reducing the rear turning radius of the upper turning body.

  Specifically, the isolation member includes a partition plate standing on a swivel frame between the engine and the cooler, and the partition plate is covered from above by the bonnet, so that the engine and the cooler are covered. It is possible to configure so that the gas flow between the two is hindered.

  By comprising in this way, it can prevent that the gas warmed by the engine mixes in the flow of the air formed by the fan.

  The swivel frame is provided with a pair of left and right vertical plates erected between the engine and the cab, and a hoisting shaft for pivotally supporting the attachment so as to be hoisted between the vertical plates. Is extended in the left-right direction, and is preferably constructed such that air behind the undulation shaft and between the vertical plates is introduced into the flow path in accordance with the operation of the fan.

  In other words, in the range behind the undulation axis, there is an empty space that excludes a configuration that interferes with the attachment in the standing posture so that the attachment can take a predetermined standing posture around the undulation axis. Therefore, if the air in this empty space is guided into the flow path, the air can be smoothly taken in from a range where there is little configuration that becomes an obstacle to the air flow.

  Therefore, according to this configuration, the cooling efficiency of the cooler can be further improved.

  ADVANTAGE OF THE INVENTION According to this invention, the cooling efficiency of a cooler can be improved, keeping the turning radius of an upper turning body small.

  Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.

  1A and 1B show a wheeled excavator according to an embodiment of the present invention. FIG. 1A is a rear view, and FIG. 1B is a right side view. FIG. 2 shows a plan view of the wheeled excavator of FIG.

  1 and 2, a wheeled excavator 1 as an example of a construction machine includes a lower traveling body 2 having a tire 2a, an upper revolving body 3 that is turnably mounted on the lower traveling body, An attachment 4 is supported at a substantially central position at the front portion of the upper swing body 3 so as to be raised and lowered, and a cab 5 provided on the upper swing body 3 on the left side of the position where the attachment 4 is supported. . In addition, suppose that the up-down and left-right direction of the wheeled shovel 1 is demonstrated using the direction seen from the passenger | crew in the cab 5. FIG.

  The attachment 4 includes a boom 6 and an arm 7 connected to the distal end portion of the boom 6. A bucket 8 is swingably attached to the distal end portion of the arm 7. The part is supported by the upper swing body 3 so as to be able to undulate around the undulation axis 9.

  The upper swing body 3 includes a swing frame 10 that is rotatably held on the lower traveling body 2, a hood 11 that covers the upper portion of the swing frame 10, and an engine provided between the swing frame 10 and the hood 11. 14 (refer FIG. 5), the air cleaner 15, the connection piping 34, the cooler 16, and the fan 43 (refer FIG. 3 each).

  FIG. 3 is a rear perspective view in which the bonnet of the upper swing body in FIG. 1 is omitted. FIG. 4 is a front perspective view in which the bonnet of the upper swing body in FIG. 1 is omitted. FIG. 5 is a partial schematic plan view of the upper swing body of FIG. 1 with the bonnet omitted.

  With reference to FIGS. 3 to 5, a pair of left and right vertical plates 17 and 18 extending in the front-rear direction at a substantially central position on the left and right are respectively provided upright on the revolving frame 10.

  A undulation shaft 9 that supports the attachment 4 is suspended in the left-right direction at the front portions of the vertical plates 17 and 18. Although not shown in the drawings, the attachment 4 is configured to be able to rise and fall between a lying down posture and a standing upright posture around the hoisting axis 9, and the attachment 4 (boom 6) in the upright posture is attached to the attachment 4. In order to avoid interference, an empty space in which the tall structure is eliminated is formed in the range behind the undulation shaft 9.

  An engine 14 is provided on the right side of the vertical plate 17 on the right side of the vertical plates 17 and 18. The engine 14 is held on the turning frame 10 in a posture in which its output shaft (not shown) is aligned in the front-rear direction. In the example of FIG. 5, a hydraulic pump (see FIG. (Not shown) shows a state in which the front portion of the engine 14 is integrated.

  An engine room 19 surrounding the engine 14 is formed in the turning frame 10.

  Specifically, the revolving frame 10 includes a pair of front and rear front struts 20 and a rear strut 21 erected on the right side of the engine 14, a vertical strut 22 that connects the upper portions of the struts 20 and 21, and the vertical struts. A partition plate 26 (see FIG. 5) provided along the right side surface of the plate 17, three horizontal front columns 23, a horizontal middle column 24, and a horizontal rear column that connect the vertical columns 22 and the upper portions of the partition plate 26 to each other. A support column 25 is provided, and each of the support columns 20 to 25 and the partition plate 26 form an outline of the engine room 19.

  As shown in FIG. 5, the front plate 27, the horizontal front column 23, and the partition plate 26 have a front plate 27, the front and rear columns 20, 21 and the vertical column 22 have a right side plate 28, and the rear column 21 and the rear column. A rear plate 29 is provided on each of the horizontal columns, and an engine room 19 surrounding the engine 14 is formed by these plates 26 to 29. The upper part of the engine room 19 is closed by the bonnet 11.

  6A and 6B show the air cleaner held on the swivel frame of FIG. 3, wherein FIG. 6A shows a rear view, and FIG. 6B shows a rear sectional view.

  With reference to FIGS. 3, 5, and 6, the air cleaner 15 is held on the revolving frame 10 at the rear portion of the engine room 19. Specifically, since the rear edge portion of the revolving frame 10 is formed in an arc shape centering on the revolving axis J1, a narrow, substantially triangular shape is required to dispose a cooler 16 described later at the rear portion of the engine room 19. A free space is formed, and the air cleaner 15 is arranged using this space.

  The air cleaner 15 includes a cleaner body 30, a supply pipe 31 that passes from the cleaner body 30 through the rear plate 29 of the engine room 19 and is connected to the intake port of the engine 14, and an introduction pipe 32 that extends upward from the cleaner body 30. , And a discharge port 33 for removing water and foreign matter remaining in the cleaner body 30.

  The air cleaner 15 is held on the revolving frame 10 in a posture in which the discharge port 33 is disposed on the lower right side and in a posture inclined rightward so that the discharge port 33 faces downward. Therefore, as shown in FIG. 6B, water, foreign matter, etc. staying in the cleaner body 30 can be collected near the discharge port 33. Therefore, these water, foreign matter, etc. can be easily passed through the discharge port 33. Can be discarded.

  The introduction pipe 32 extends upward along the partition plate 26, and its upper end is connected to the connection pipe 34.

  7 is a cross-sectional view taken along line VII-VII in FIG.

  With reference to FIGS. 3, 4, and 7, the connecting pipe 34 is disposed on the partition plate 26 so as to straddle the partition plate 26. Specifically, the connecting pipe 34 includes a substrate 35 fixed on the partition plate 26 and the horizontal rear column 25, and a duct member 36 that forms a closed cross section with the substrate 35.

  The substrate 35 is formed in a range from the partition plate 26 to above the air cleaner 15. A hole 35a penetrating in the vertical direction is formed in the substrate 35, and the upper end of the introduction pipe 32 and the substrate 35 are connected through the hole 35a so that air can be introduced.

  The pipe member 36 includes a box 37 that surrounds the left and right, rear, and upper sides of the hole 35a of the substrate 35 and opens forward, an L-shaped body 38 that extends forward from the box 37 and bends to the left, and these boxes. A filter 39 (see FIG. 7) provided between the body 37 and the L-shaped body 38 is provided.

  The L-shaped body 38 includes an L-shaped top plate 38a in plan view, and a side plate 38b that is folded downward from an edge of the top plate 38a and is fixed to the upper surface of the substrate 35. While being connected to the opening of the body 37, the left terminal opens to the left side of the partition plate 26 through the introduction port 38c. The introduction port 38c is disposed in front of the cooler 16 described later (see FIG. 7).

  Therefore, a passage capable of guiding the gas introduced from the introduction port 38c to the introduction pipe 32 through the hole 35a is formed between the substrate 35 and the pipe member 36.

  A filter 39 is provided between the substrate 35 and the pipe line member 36 so as to block this passage. The filter 39 is formed of a relatively coarse metal net, and removes foreign matters contained in the passing air.

  The cooler 16 is provided at the rear of the revolving frame 10 and between the vertical plates 17 and 18. That is, the cooler 16 is disposed behind the undulation shaft 9 that supports the attachment 4.

  The cooler 16 includes an oil cooler 40 that cools the oil of the engine 14, a radiator 41 that cools the coolant of the engine 14, and a storage box 42 that houses the oil cooler 40 and the radiator 41.

  As shown in FIG. 4, the cooler 16 and the connecting pipe 34 are covered with a cover 44 that is a part of the bonnet 11. The cover 44 includes a plate-like main body 44a and a protrusion 44b protruding upward from the main body 44a. The upper end of the cooler 16 is placed in a recess 44c surrounded by the inner surface of the protrusion 44b. And the connecting pipe 34 are accommodated.

  Then, the cover 44 (bonnet 11) covers the swivel frame 10 so that the undulation shaft 9 and the cooler 16 are interposed between the cover 44 and the swivel frame 10, as shown in FIG. As shown in FIG. 7, an introduction portion 45 that opens forward is formed, and a flow path 46 that guides outside air introduced from the introduction portion 45 to the cooler 16 side is formed.

  That is, the introduction portion 45 is an opening formed between the front edge portion of the cover 44 and the turning frame 10 at a position between the cab 5 and the engine 14, and the flow path 46 is formed between the cover 44 and the turning frame. 10, especially the gap between the vertical plates 17 and 18.

  The fan 43 is provided at the rear portion of the storage box 42 and can form a flow of wind that blows through the storage box 42 in the front-rear direction.

  Accordingly, when the fan 43 is operated, outside air is introduced from the introduction portion 45 as indicated by an arrow Y1 in FIG. 2, and this outside air moves the storage box 42 forward as indicated by an arrow Y2 in FIG. Will blow through backwards. Then, the wind blown rearward is discharged to the outside of the bonnet 11 through the ventilation opening 47a (see FIG. 1) of the counterweight 47 provided upright at the rear edge of the revolving frame 10. The counterweight 47 is erected along the rear edge portion of the revolving frame 10 and holds the bonnet 11 at the upper portion thereof.

  In this manner, a flow of air that blows back and forth through the cooler 16 according to the operation of the fan 43 can be formed between the revolving frame 10 and the hood 11 as indicated by arrows Y1 and Y2. Here, since the partition plate 26 is provided between the engine 14 and the cooler 16, it is possible to suppress the air warmed by the engine 14 from being mixed into the wind flow.

  Further, part of the outside air introduced from the introduction part 45 is led into the introduction port 38c of the connection pipe 34 as shown by an arrow Y3 in FIG. The outside air thus led into the introduction port 38c is led to the cleaner body 30 via the introduction pipe 32 as shown by an arrow Y4 in FIG. 5A, and this cleaner body as shown by an arrow Y5. 30 is led to the engine 14 through the supply pipe 31.

  In this way, since the outside air introduced from the introduction part 45 can be guided to the engine 14, the combustion efficiency of the engine 14 can be improved by guiding the air at a lower temperature than the case where the air warmed by the engine 14 is used. Can be improved.

  As described above, according to the wheeled excavator 1, the flow path 46 into which the outside air can be introduced turns from the space between the cab 5 and the engine 14 toward the rear cooler 16 as indicated by the arrow Y1 in FIG. Since the counterweight 47 is formed between the frame 10 and the bonnet 11, the vent weight 47 a (see FIG. 1) for discharging the outside air introduced in this way to the rear of the upper swing body 3 is formed. An air flow from the front to the rear can be formed between the revolving frame 10 and the bonnet 11 in accordance with the operation of the fan 43.

  Since the wheel excavator 1 is provided with the partition plate 26 that isolates the cooler 16 from the engine 14, even when the wheel excavator 1 is running, the air warmed by the engine 14 is cooled by the cooler 16. Therefore, it is possible to prevent the warmed air from being mixed into the air flow in the front-rear direction described above.

  Therefore, according to the wheel-type excavator 1, the engine 14 is disposed on the side of the undulation shaft 9 (supporting position of the attachment 4), and the layout in which the cooler 16 is disposed behind the undulation shaft 9 is not disturbed. Therefore, the cooling efficiency of the cooler 16 can be improved while maintaining the layout advantage of reducing the rear turning radius of the upper swing body 3.

  Further, as in the above-described embodiment, the partition plate 26 is provided between the engine 14 and the cooler 16 so as to stand on the revolving frame 10. It is possible to prevent the air from being mixed into the air flow.

  In particular, the wheel-type excavator 1 is capable of high-speed traveling as compared with a crawler-type excavator or the like, and thus a large amount of gas warmed by the engine 14 may flow toward the cooler 16 (rear) during the traveling. However, even in such a case, since the outside air introduced from the introduction portion 45 is introduced into the cooler 16 through the flow path 46, the cooling efficiency of the cooler 16 is prevented from being lowered. be able to.

  Further, as in the above-described embodiment, the structure is such that air is introduced behind the undulation shaft 9 and between the vertical plates 17 and 18 to prevent interference with the undulation operation of the attachment 4. Since the outside air can be introduced into the introduction portion 45 from the empty space behind the undulation shaft 9 excluding the configuration, the outside air can be smoothly taken in from a range with a small configuration that becomes an obstacle to the air flow.

The wheel type shovel which concerns on embodiment of this invention is shown, (a) is a rear view, (b) has shown the right view. The top view of the wheel type shovel of FIG. 1 is shown. It is a back perspective view which abbreviate | omits and shows the bonnet of the upper revolving body of FIG. It is a front perspective view which abbreviate | omits and shows the bonnet of the upper revolving body of FIG. FIG. 2 is a partial plan view schematically showing the upper swing body of FIG. 1 with the bonnet omitted. The air cleaner hold | maintained on the turning frame of FIG. 3 is shown, (a) is a rear view, (b) has shown the back sectional drawing. It is the VII-VII sectional view taken on the line of FIG.

Explanation of symbols

1 Wheeled excavator (construction machine)
2 Lower traveling body 3 Upper revolving body 4 Attachment 5 Cab 9 Elevating shaft (attachment support position)
DESCRIPTION OF SYMBOLS 10 Revolving frame 11 Bonnet 14 Engine 15 Air cleaner 16 Cooler 26 Partition plate 34 Connection pipe 35 Substrate 35a Hole 36 Pipe line member 38c Inlet 39 Filter 43 Fan 44 Cover (part of bonnet)
45 Introduction part 46 Flow path

Claims (3)

A self-propelled lower traveling body, a revolving frame mounted on the lower traveling body, and an upper revolving body including a bonnet that covers the revolving frame, and a undulation at a substantially central position of a front portion of the revolving frame A construction machine comprising an attachment supported in a possible manner and a cab provided on the swivel frame at a side of a position where the attachment is supported,
An engine held on the swivel frame on the side opposite the cab relative to the attachment support position;
A cooler that includes a radiator that cools cooling water of the engine, and that is held on the swivel frame behind a support position of the attachment;
A fan capable of forming a flow of wind through the radiator from the front to the rear;
A counterweight standing on the swivel frame at a rear position of the cooler and covering the swivel frame in cooperation with the bonnet;
An isolation member provided between the swivel frame and the bonnet and separating the cooler from the engine;
When the swivel frame is covered with a bonnet, a flow path capable of introducing outside air from between the cab and the engine toward the rear cooler is formed between the swirl frame and the bonnet. The construction machine is characterized in that the counterweight is formed with a vent hole for discharging the air guided to the rear of the cooler by the operation of the fan to the rear of the upper swing body.   The isolation member includes a partition plate erected on a swivel frame between the engine and the cooler, and the partition plate is covered from above by the bonnet, so that the partition between the engine and the cooler is provided. The construction machine according to claim 1, wherein gas flow is hindered.   The swivel frame is provided with a pair of left and right vertical plates that are erected between the engine and the cab, and a undulation shaft that supports the attachment so as to be able to undulate is provided between the vertical plates. 3. The air according to claim 1, wherein the air extends between the vertical axis and the air between the vertical plates and between the vertical plates is introduced into the flow path according to the operation of the fan. Construction machinery.

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