JP4591388B2 - Construction machinery - Google Patents

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 or behind the cab.

In this wheeled excavator, by arranging the radiator on the side of the engine (attachment support position or behind the cab), the front and rear range when arranging the engine and the radiator side by side is reduced by the amount of the radiator. Therefore, the longitudinal length of the upper swing body can be further shortened.
Japanese Utility Model Publication No. 2-54725

  By the way, for the purpose of making the turning radius as small as possible, the rear edge portion of the upper turning body may be formed in an arc shape around the turning axis.

  In the case of adopting the layout as disclosed in Patent Document 1 in such an upper swing body, there is a small space for disposing a cooler such as the radiator between the engine and the rear edge of the upper swing body. Since a space is generated, an air cleaner connected to the intake port of the engine is arranged using this space.

  However, when such a layout is adopted, since an air cleaner is disposed behind the engine, it is difficult to improve the combustion efficiency of the engine.

  In other words, when air at the installation position is introduced into the air cleaner as it is, the air warmed by the engine flows to the rear of the engine when the construction machine is running. The combustion was performed using a gas having a high temperature, that is, a low air density, and the engine efficiency was poor.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a construction machine that can improve engine efficiency while maintaining a small turning radius of the upper-part turning body.

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 wind through the radiator from the front to the rear, and a rear of the engine An air cleaner that is held on the revolving frame and that can introduce air introduced from the intake portion thereof to the engine, and an inlet that opens in front of the cooler and that introduces air introduced from the inlet. The connecting pipe connected to the air cleaner so as to be able to be introduced into the intake portion, and provided between the swivel frame and the bonnet, and cooled with the engine so as to isolate the inlet of the connecting pipe from the engine And a partition plate standing on the swivel frame between the swivel frame and the bonnet, so that the cooler is located between the swivel frame and the bonnet from the attachment support position. A flow path capable of directing outside air is formed, and when the fan operates, outside air is introduced into the flow path. Is with blows back and forth the cooler, inlet port of the connection pipe is provided in a position that is as acceptable part of the outside air flowing through the flow path, the connecting pipe, the partition on the partition plate The construction is characterized in that the bonnet covers the partition plate and the connecting pipe from above so as to prevent the gas from flowing between the engine and the cooler while being arranged so as to straddle the plate. Provide machines .

  According to the present invention, the flow path capable of guiding the outside air backward from the attachment support position toward the cooler is formed between the swivel frame and the bonnet. The cooler can be cooled by outside air flowing through the path.

  And in this invention, since the connection piping which has the inlet port arrange | positioned ahead of the cooler is provided, a part of outside air which flows through the said flow path is taken in in an inlet port, and this outside air is guide | induced to an air cleaner. Can do.

  In other words, in the present invention, the outside air introduced from the attachment support position is used to cool the cooler, and a part of the outside air flowing through the flow path is led into the connecting pipe on the way to the cooler. It can also be used as combustion air.

  Therefore, compared with the conventional technology that sucks the air behind the engine as it is, more outside air introduced from the attachment support position can be guided to the engine even when the construction machine is running. Combustion efficiency can be improved.

  Therefore, according to the present invention, the engine and the air cleaner are arranged side by side on the side of the support position of the attachment, and outside air is supplied to the air cleaner without destroying the layout of arranging the cooler behind the support position of the attachment. Therefore, the combustion efficiency of the engine can be improved while maintaining the layout advantage of reducing the rear turning radius of the upper turning body.

In addition, even if it is the structure which provided the connection piping, since there exists a possibility that the air warmed by the engine may be led into the inlet when the construction machine is traveling, in the present invention, the engine is interposed between the swivel frame and the bonnet. It is set to be provided with isolation member for isolating the inlet from.

Thus, since the separating member for isolating the introduction port from the engine is provided, it is possible to reliably prevent the air heated by the engine from being guided into the introduction port.

Therefore, according to the present invention , the outside air introduced from the attachment support position can be reliably guided to the connecting pipe without being mixed with the gas warmed by the engine, thereby further improving the combustion efficiency of the engine. be able to.

Furthermore, the isolating member comprises a partition plate provided upright on the revolving frame between the engine and the cooler, by which the partition plate is covered from above by the hood, and the engine and the cooler gas communication between has been configured to be disturbed.

  By comprising in this way, mixing with the gas warmed by the engine and the external air introduced from the support position of the attachment can be prevented.

Further, in the present invention, in terms of providing the partition plate, the connection pipe, by arranging so as to straddle the partition plate on the partition plate, disposing the connection pipe so as to penetrate the partition plate Compared to the case, the connecting pipes can be arranged without occupying a space near the surface of the swivel frame, so that the degree of freedom of layout of other devices and the like held on the swivel frame can be increased.

In the construction machine, a rear edge portion of the revolving frame is formed in an arc shape, and the air cleaner is held on the revolving frame in an inclined posture so that a lower portion is closer to the cooler than an upper portion of the air cleaner. It is preferable that

In the construction machine, the air cleaner includes a cleaner body and a discharge port for removing foreign substances staying in the cleaner body, and the swivel is performed with the cleaner body inclined so that the discharge port faces downward. Preferably it is held on a frame.

  Specifically, the connecting pipe has a board provided on the partition plate and a pipe member provided on the board and forming a closed cross section with the board. it can.

  If it does in this way, since a closed section can be constituted between both by a substrate and a pipe line member, the composition of connection piping can be simplified.

  The substrate is formed with a hole penetrating in the vertical direction and capable of supplying air to the air cleaner intake portion, and the pipe member extends over the substrate with one end covering the hole, The other end is opened to the side to form the introduction port, so that the air introduced from the side through the introduction port formed in the duct member is lowered through the hole formed in the substrate. This air can be led to the air cleaner.

  By the way, although foreign matter contained in the air supplied to the engine is removed by the air cleaner, a filter that removes foreign matter contained in the air guided in the connection pipe is provided in the connection pipe, thereby introducing the foreign substance into the air cleaner. Prior to being removed, foreign matters contained in the outside air can be removed in the connecting pipe, so that the frequency of removing foreign matters can be reduced by the air cleaner, and the effectiveness of the air cleaner can be maintained for a long period of time.

  ADVANTAGE OF THE INVENTION According to this invention, the construction machine which can improve engine efficiency can be provided, maintaining 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.

  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 passing from the cleaner body 30 through the rear plate 29 of the engine room 19 to the intake port of the engine 14, and an introduction pipe (intake air) extending upward from the cleaner body 30. Part) 32 and a discharge port 33 for removing water, foreign matter and the like 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 revolving frame 10, and the flow path 46 is between the cover 44 and the revolving frame 10, particularly between the vertical plates 17, It is a gap between 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. Note that 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 at the rear portion of the turning frame 10.

  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 capable of guiding the outside air from the support position (introduction portion 45) of the attachment 4 toward the cooler 16 is provided in the swivel frame 10 and the bonnet 11. Therefore, the cooler 16 can be cooled by the outside air (see arrow Y2 in FIG. 7) flowing through the flow path 46 in accordance with the operation of the fan 43.

  In the wheeled excavator 1, since the connection pipe 34 having the introduction port 38 c disposed in front of the cooler 16 is provided, a part of the outside air flowing through the flow path 46 is taken into the introduction port 38 c. Outside air can be guided to the air cleaner 15.

  That is, in the wheeled excavator 1, a part of the outside air flowing through the flow path 46 is transferred to the cooler 16 while the outside air introduced from the support position (introducing portion 45) of the attachment 4 is used to cool the cooler 16. In the middle of the flow, it can be led into the connecting pipe 34 and used as engine combustion air.

  Therefore, as compared with the conventional technique in which the air behind the engine 14 is directly taken in, even when the wheeled excavator 1 is traveling, more outside air is introduced from the attachment support position (introduction portion 45). Therefore, the combustion efficiency of the engine 14 can be improved.

  Therefore, according to the wheel type excavator 1, the engine 14 and the air cleaner 15 are arranged side by side on the side of the support position (the undulation shaft 9) of the attachment 4, and the cooler 16 is disposed behind the support position of the attachment 4. Since the outside air can be supplied to the air cleaner 15 without breaking the layout, the combustion efficiency of the engine 14 can be improved while maintaining the layout advantage of reducing the rear turning radius of the upper swing body 3. .

  Furthermore, since the wheel excavator 1 includes the partition plate 26 erected on the revolving frame 10 between the engine 14 and the cooler 16, the air warmed by the engine 14 enters the introduction port 38c. It can be surely prevented from being guided.

  Therefore, since the outside air introduced from the introduction part 45 can be reliably guided to the connecting pipe 34 without being mixed with the gas warmed by the engine, the combustion efficiency of the engine 14 can be further improved.

  In particular, since the wheel type excavator 1 is capable of high-speed traveling as compared with a crawler type excavator or the like, a large amount of gas warmed by the engine 14 during the traveling may flow to the air cleaner 15 side (rear). However, even in such a case, since the outside air introduced from the introduction portion 45 is introduced into the air cleaner 15 through the connection pipe 34, it is possible to prevent the efficiency of the engine 14 from decreasing.

  The connecting pipe 34 is disposed on the partition plate 26 so as to straddle the partition plate 26, so that the swivel frame 10 is compared with the case where the connecting pipe 34 is provided so as to penetrate the partition plate 26. Since the connecting pipe 34 can be arranged without occupying a space near the surface of the other, it is possible to increase the degree of freedom in the layout of other devices and the like held on the turning frame 10.

  According to the configuration in which the connecting pipe 34 includes the substrate 35 and the conduit member 36 provided on the substrate 35, the substrate 35 and the conduit member 36 can form a closed cross section between them. The configuration of the connecting pipe 34 can be simplified.

  And in the said embodiment, the air introduced from the side through the inlet 38c formed in the pipe line member 36 is led out downward through the hole 35a formed in the board | substrate 35, and this air is led out. It can be guided to the air cleaner 15.

  Further, since the connection pipe 34 is provided with a filter for removing foreign matters contained in the air guided through the connection pipe 34, the filter is included in the outside air in the connection pipe 34 before being guided to the air cleaner. Foreign matter can be removed, and the frequency of foreign matter removal can be reduced by the air cleaner 15 so that the utility of the air cleaner can be maintained for a long time.

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.

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 Turning 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 (6)

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;
An air cleaner that is held on the swivel frame behind the engine and that can introduce air introduced from an intake portion thereof to the engine;
A connecting pipe having an inlet opening in front of the cooler and connected to the air cleaner so that the air introduced from the inlet can be introduced into the intake section ;
A partition plate provided between the swivel frame and the bonnet, and standing on the swivel frame between the engine and the cooler so as to isolate the inlet of the connection pipe from the engine;
By covering the swivel frame with a bonnet, a flow path is formed between the swirl frame and the bonnet so that outside air can be guided from the attachment support position toward the cooler. By operating, outside air is introduced into the flow path and blows through the cooler back and forth, and the inlet of the connection pipe is provided at a position where a part of the outside air flowing through the flow path can be received. ,
The connection pipe is disposed on the partition plate so as to straddle the partition plate, and the bonnet is configured to prevent the gas from flowing between the engine and the cooler. A construction machine that covers the connecting pipe from above. The rear edge of the swivel frame is formed in an arc shape,
2. The construction machine according to claim 1, wherein the air cleaner is held on the revolving frame in an inclined posture so that a lower portion of the air cleaner is closer to the cooler than an upper portion of the air cleaner. The air cleaner includes a cleaner body and a discharge port for removing foreign matter staying in the cleaner body, and the cleaner body is held on the swivel frame in an inclined posture so that the discharge port faces downward. The construction machine according to claim 2, wherein The connection pipe includes a board provided on the partition plate and a pipe member provided on the board and forming a closed cross section with the board. The construction machine of any one of -3. The substrate is formed with a hole penetrating in the vertical direction and capable of supplying air to the intake portion of the air cleaner, and the pipe member has one end extending over the hole and extending onto the substrate. The construction machine according to claim 4, wherein a side opening is formed to form the introduction port. The construction machine according to any one of claims 1 to 5, wherein the connection pipe is provided with a filter for removing foreign substances contained in the air guided through the connection pipe.

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