JP2010007525A - Construction machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To attach an exhaust gas treatment device to a member different from an engine. <P>SOLUTION: A building member 16 is provided to surround a hydraulic pump 11, and a shielding cover 17 for shielding between the engine 9 and the hydraulic pump 11 is provided to the building member 16. The shielding cover 17 is provided with a treatment device mounting portion 17A for mounting the exhaust gas treatment device 18, and a thusly assembled sub assembly 15 is attached to a turning frame 5. Thereby, it is possible to disconnect the exhaust gas treatment device 18 from the vibration system of the engine 9 and prevent vibration transmission of the engine 9. Since the shielding cover 17 is attached before the exhaust gas treatment device 18 is connected to the engine 9, there is no necessity to pass the shielding cover through a narrow gap between the hydraulic pump 11 and the exhaust gas treatment device 18 and the shielding cover is arranged by a simple work. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a construction machine such as a hydraulic excavator, and more particularly to a construction machine provided with an exhaust gas processing device for processing exhaust gas of an engine.

  In general, a hydraulic excavator as a representative example of a construction machine is a self-propelled lower traveling body, an upper revolving body that is swingably mounted on the lower traveling body, and can be raised and raised on the front side of the upper revolving body. And a working device provided.

  The upper revolving structure includes a revolving frame that forms a support structure, a cab that is provided on the front side of the revolving frame, on which an operator rides, an engine that is mounted on the rear side of the revolving frame, and a length of the engine. A hydraulic pump provided on one side of the direction, an exhaust gas treatment device connected to the exhaust manifold of the engine via an exhaust pipe, and a building cover provided on the revolving frame so as to cover these devices It is roughly constituted by.

  Here, as an exhaust gas treatment device connected to an engine, a silencer for reducing noise of exhaust gas, an exhaust gas purification device for removing harmful substances in the exhaust gas, and the like are known. Since this exhaust gas treatment device is connected to the engine, it is attached to the engine having the same vibration system using a bracket (for example, see Patent Document 1).

JP 2003-104071 A

  In addition, in hydraulic excavators, even if a situation in which oil liquid is ejected from a hydraulic pump or the like occurs, a shield that blocks between the engine and the hydraulic pump in the building cover is provided so that the oil liquid does not scatter to the hot engine side. A cover (firewall) is provided (for example, see Patent Document 2).

JP 2004-293495 A

  The shield cover extends from the side of the exhaust gas processing device to cover the lower side and extends to the mounting position of the hydraulic pump with respect to the engine, and then closes the periphery of the hydraulic pump with respect to the engine. It extends to. Therefore, the general shape of the shielding cover is such that it extends from the side of the exhaust gas processing device to the engine side below the processing device and extends downward at the mounting position of the hydraulic pump with respect to the engine. This shielding cover is configured to be attached to, for example, a structure forming a revolving frame, a part of a building cover, or the like.

  Here, in the hydraulic excavator according to Patent Document 1 described above, the exhaust gas treatment device is attached to the engine using a bracket. For this reason, the exhaust gas processing device has the same vibration system as the engine, and the high frequency vibration of the engine is directly transmitted. Therefore, there is a problem that the exhaust gas processing member constituting the exhaust gas processing device is damaged by this vibration. is there.

  Further, in the hydraulic excavator according to Patent Document 2, since a shielding cover is disposed so as to shield between the engine, the exhaust gas processing device and the hydraulic pump, the shielding cover is disposed from the side of the exhaust gas processing device. The lower part of the apparatus extends to the engine side, and has a complicated shape extending downward at the mounting position of the hydraulic pump with respect to the engine. For this reason, it is difficult to install the shielding cover in a narrow place between the exhaust gas processing device and the hydraulic pump, and it takes time and effort for the installation work. Furthermore, depending on the shielding cover, it may not be attached unless it is divided into a plurality of parts, and there is a problem that assembly workability is poor.

  The present invention has been made in view of the above-described problems of the prior art, and an object of the present invention is to easily attach the shielding cover to a member different from the engine and to block between the engine and the hydraulic pump. It is to provide a construction machine that can be installed by simple work.

  A construction machine according to the present invention is connected to a self-propelled vehicle body, an engine mounted on the vehicle body, a hydraulic pump provided on one side in the longitudinal direction of the engine, and the engine via an exhaust pipe. And an exhaust gas processing device for processing the exhaust gas.

  In order to solve the above-described problem, the invention adopts the feature that the invention according to claim 1 is characterized in that the vehicle body is erected with the hydraulic pump interposed therebetween so as to form a pump chamber surrounding the hydraulic pump. A building member comprising two vertical plates and a connecting plate for connecting the vertical plates is provided, and the building member is provided with a shielding cover that shields between the engine and the hydraulic pump. The processing apparatus mounting portion for mounting the exhaust gas processing apparatus is provided on the upper side of the exhaust gas processing apparatus.

  According to a second aspect of the present invention, the exhaust gas processing device is attached to the processing device mounting portion of the shielding cover, and a vibration isolating member is provided between the processing device mounting portion and the exhaust gas processing device. .

  According to a third aspect of the present invention, a processing apparatus subassembly is formed by pre-assembling the shielding cover and the exhaust gas processing device to the building member with the building member as a main material. The configuration is such that it is attached to the vehicle body as a single component.

  According to a fourth aspect of the present invention, the shielding cover includes the processing device mounting portion formed flat, a rising plate extending upward from an end of the processing device mounting portion opposite to the engine, and the processing device mounting. This is a firewall formed by a falling plate extending downward from the end of the engine on the engine side.

  According to a fifth aspect of the present invention, a flexible pipe is provided in the middle of the exhaust pipe connecting the engine and the exhaust gas treatment device.

  According to the invention of claim 1, the two vertical plates are erected on the vehicle body so as to sandwich the hydraulic pump, and the hydraulic pump is surrounded by the building member by connecting the two vertical plates using the connecting plate. A pump chamber can be formed. Further, by providing the shielding cover on the building member, it is possible to block between the engine and the hydraulic pump. And if a shielding cover is provided in a building member, an exhaust-gas processing apparatus can be attached to the processing apparatus attaching part provided above this shielding cover.

  Therefore, the exhaust gas treatment device can be attached to a building member different from the vibration system of the engine via the shielding cover. As a result, the vibration of the engine that constantly vibrates at a high frequency can be prevented from being transmitted to the exhaust gas treatment device, and the equipment constituting the exhaust gas treatment device can be protected from engine vibration. Can be improved.

  Further, since the shielding cover can be provided on the building member before the exhaust gas treatment device is arranged, it is not necessary to arrange the shielding cover in a narrow gap between the hydraulic pump and the exhaust gas treatment device. Thereby, the shielding cover can be reliably provided by a simple operation at a position that shields between the engine and the hydraulic pump, and the assembling workability, reliability, and the like can be improved.

  According to the second aspect of the present invention, when the exhaust gas processing device is attached to the processing device mounting portion of the shielding cover, the exhaust gas processing device can be supported in a vibration-proof manner by using the vibration isolating member in the processing device mounting portion. Thereby, for example, various filters, catalysts, sensors, and the like built in the exhaust gas treatment device can be protected from vibrations during travel and work.

  According to the invention of claim 3, the processing device sub-assembly can be formed by assembling the shielding cover and the exhaust gas processing device in advance to a building member composed of two vertical plates and a connecting plate. The assembled processing apparatus subassembly can be easily attached to the vehicle body as a single component in a short time.

  According to the invention of claim 4, the shielding cover includes a flat processing device mounting portion, a rising plate extending upward from the processing device mounting portion, and a falling plate extending downward from the processing device mounting portion. Therefore, a shielding cover can be arranged according to the arrangement relationship between the exhaust gas treatment device and the hydraulic pump, and this shielding cover allows the engine, the exhaust gas treatment device, and the hydraulic pump to be connected to each other. Can be reliably blocked.

  According to the invention of claim 5, since the flexible pipe is provided in the middle of the exhaust pipe of the engine, the vibration generated relatively between the engine side and the vehicle body side can be absorbed by the flexible pipe. The durability of the exhaust pipe, engine, exhaust gas treatment device, etc. can be improved.

  Hereinafter, as a construction machine according to an embodiment of the present invention, a crawler hydraulic excavator will be described as an example, and will be described in detail with reference to FIGS.

  In FIG. 1, reference numeral 1 denotes a crawler hydraulic excavator as a construction machine. The hydraulic excavator 1 is mounted on a self-propelled lower traveling body 2 and on the lower traveling body 2 so as to be turnable. 2 is constituted roughly by an upper swing body 3 constituting a vehicle body, and a work device 4 provided on the front side of the upper swing body 3 so as to be able to move up and down and performing excavation work of earth and sand. The lower traveling body 2 and the upper swing body 3 are specific examples of the vehicle body according to the present invention.

  Here, the upper swing body 3 constituting the excavator 1 will be described in detail. Reference numeral 5 denotes a swing frame of the upper swing body 3, and the swing frame 5 is configured as a support structure. As shown in FIGS. 2 and 3, the revolving frame 5 is provided with a bottom plate 5A made of a thick steel plate or the like extending in the front and rear directions, and standing on the bottom plate 5A, with a predetermined interval in the left and right directions. Left and right vertical plates 5B and 5C extending in the front and rear directions, and left and right side frames 5D and right extending in the front and rear directions. A side frame 5E and a plurality of extended beams 5F that extend from the bottom plate 5A and the vertical plates 5B and 5C in the left and right directions and support the left and right side frames 5D and 5E at the leading ends thereof. ing. A working device 4 is mounted on the front side of each of the vertical plates 5B and 5C in the center of the left and right directions so as to be able to move up and down. A solid 15 or the like is provided.

  Reference numeral 6 denotes a cab (see FIG. 1) mounted on the left front side of the revolving frame 5 (left side of the foot part of the working device 4). The cab 6 is carried by an operator, and the operator sits inside the cab 6 A seat, an operation lever for traveling, an operation lever for work, and the like (all not shown) are provided.

  Reference numeral 7 denotes a counterweight attached to the rear end portion of the revolving frame 5, and this counterweight 7 balances the weight with the work device 4. Moreover, as shown in FIG. 2, the counterweight 7 is formed so that the front surface is flat and the rear surface side is curved.

  Here, a plurality of chambers are provided on the swivel frame 5 on the front side of the counterweight 7. For example, an engine chamber 8A in which the engine 9 is disposed at the center in the left and right directions, a heat exchanger chamber 8B on the left side of the engine chamber 8A, and a building member 16 described later on the right side of the engine chamber 8A. A defined pump chamber 8C is provided.

  Reference numeral 9 denotes an engine provided on the rear side of the turning frame 5, and the engine 9 is mounted in the engine room 8A in a horizontally placed state extending in the left and right directions. Further, as shown in FIG. 4, a cooling fan 9 </ b> A for supplying cooling air to a heat exchanger 10 to be described later is provided on the left side of the engine 9.

  On the other hand, the right side of the engine 9 is a pump mounting portion 9B for mounting a hydraulic pump 11 described later. In addition, a turbocharger 9C (see FIG. 2) such as a turbocharger that increases the flow rate of intake air is connected to the exhaust manifold 9D at the front upper portion of the engine 9, and the supercharger 9C is described later. An exhaust pipe 20 is connected. The engine 9 is supported on the revolving frame 5 in a vibration-proof state via, for example, four vibration-proof members 9E (only two are shown in FIG. 4).

  Here, the vibration isolator 9E for the engine that supports the engine 9 on the revolving frame 5 (see FIG. 4) will be described. Since the vibration isolating member 9E supports the engine 9 which is a heavy object, the vibration isolating member 9E is formed using an elastic body having a desired strength with respect to the weight.

  Reference numeral 10 denotes a heat exchanger disposed in the heat exchanger chamber 8B on the left side of the engine 9, and the heat exchanger 10 is provided facing the cooling fan 9A. The heat exchanger 10 includes, for example, a radiator that cools engine cooling water, an oil cooler that cools hydraulic oil, an intercooler that cools air taken in by the engine 9, and the like.

  Reference numeral 11 denotes a hydraulic pump disposed in a pump chamber 8C on the right side of the engine 9, and the hydraulic pump 11 is driven by the engine 9 so that hydraulic oil supplied from a hydraulic oil tank 12, which will be described later, is pressurized oil. Are discharged. The base end side of the hydraulic pump 11 is a flange portion 11A, and is bolted to the pump mounting portion 9B of the engine 9 by the flange portion 11A.

  Reference numeral 12 denotes a hydraulic oil tank (see FIG. 2) which is located on the front side of the hydraulic pump 11 and is provided on the right side of the revolving frame 5. The hydraulic oil tank 12 drives the lower traveling body 2, work device 4 and the like. The hydraulic oil is stored. Reference numeral 13 denotes a fuel tank provided on the front side of the hydraulic oil tank 12.

  A building cover 14 closes the engine 9, the heat exchanger 10, the exhaust gas treatment device 18, and the like from above. The building cover 14 is provided between the cab 6 and the counterweight 7 on the swivel frame 5. It has been. Then, as shown in FIG. 4, the building cover 14 is positioned so as to cover the left side plate 14A, the right side plate 14B, the engine 9 and the like, which are located on both the left and right sides of the revolving frame 5 and extend forward and rearward. The upper surface plate 14C extending in the horizontal direction between the upper end portions of the side plates 14A and 14B is roughly configured. Further, an engine cover 14D is provided on the upper surface plate 14C so as to be openable and closable so as to close the maintenance opening. The building cover 14 is mounted on the revolving frame 5 using a building member 16 described later and another building member (supporting beam) (not shown).

  Next, the processing apparatus subassembly 15 according to the present embodiment provided separately from the engine 9 on the right side of the engine 9 will be described.

  That is, 15 is a processing device subassembly disposed on the right side of the engine 9 for processing exhaust gas. The sub-assembly 15 can be assembled in advance at a location different from the assembly line for assembling the upper swing body 3 and can be assembled to the swing frame 5 as one part. The processing device subassembly 15 includes a building member 16, a shielding cover 17, an exhaust gas processing device 18 and the like, which will be described later, as shown in FIGS.

  Reference numeral 16 denotes a building member which is located on the right side of the engine 9 and is provided on the revolving frame 5, and this building member 16 forms a part of the beam structure of the revolving frame 5. The building member 16 supports the top plate 14C and the like of the building cover 14 and defines the pump chamber 8C surrounding the hydraulic pump 11, and constitutes the main material of the processing device subassembly 15. Yes. The building member 16 includes a front vertical plate 16A erected on the front side of the hydraulic pump 11, and a rear vertical plate 16B erected facing each other with the hydraulic pump 11 sandwiched in the front and rear directions. This is generally constituted by a connecting plate 16C connecting the upper right side of the front vertical plate 16A and the upper right side of the rear vertical plate 16B.

  Here, the front vertical plate 16 </ b> A constituting the building member 16 is composed of a substantially rectangular plate body extending leftward and rightward so as to face the rear surface of the hydraulic oil tank 12, for example, and a lower portion thereof is the revolving frame 5. Installed. In a similar manner, the rear vertical plate 16 </ b> B is formed of a substantially rectangular plate body extending in the left and right directions so as to face the front surface of the counterweight 7, and a lower portion thereof is attached to the revolving frame 5. On the other hand, the connecting plate 16C is formed of a plate body that is long in the front and rear directions, and its end portions are integrally bolted to the upper surface portions of the front vertical plate 16A and the rear vertical plate 16B.

  Reference numeral 17 denotes a shielding cover provided on the building member 16. The shielding cover 17 shields between the engine 9 and the hydraulic pump 11, and is generally called a firewall. The shielding cover 17 can prevent the oil liquid from being scattered on the high-temperature engine 9 side even if the oil liquid is ejected from the hydraulic pump 11 or the like.

  Further, the shielding cover 17 according to the present embodiment is formed as a stepped plate by bending a single steel plate cut into a predetermined shape, for example. Specifically, as shown in FIGS. 9 and 10, a wide and flat rectangular processing apparatus mounting portion 17A, and a rising extending upward from the front end (end opposite to the engine 9) of the processing apparatus mounting portion 17A. The plate 17B and a falling plate 17C extending downward from the rear end (end portion on the engine 9 side) of the processing device mounting portion 17A. Further, the falling plate 17C is formed with a notch portion 17D into which the hydraulic pump 11 enters, and the falling plate 17C disposes the hydraulic pump 11 to the engine 9 by arranging the hydraulic pump 11 in the notch portion 17D. Can be effectively shielded against.

  On the other hand, for example, the rising plate 17B and the falling plate 17C are provided with brackets 17E for attaching the shielding cover 17 to the front vertical plate 16A and the rear vertical plate 16B of the building member 16. The bracket 17E can be provided not only on the rising plate 17B and the falling plate 17C but also on the processing apparatus mounting portion 17A.

  Further, the processing device mounting portion 17A of the shielding cover 17 is for mounting an exhaust gas processing device 18 described later, and is formed as a substantially horizontal and flat plate. Accordingly, the processing apparatus mounting portion 17A can stably dispose the exhaust gas processing apparatus 18 above the hydraulic pump 11.

  The shielding cover 17 as a firewall is disposed between the front vertical plate 16A and the rear vertical plate 16B so that the rising plate 17B is positioned directly below the connecting plate 16C of the building member 16, and each bracket 17E is disposed on the front vertical plate. 16A and bolt to the rear vertical plate 16B. The attaching operation of the shielding cover 17 can be performed in a state where the building member 16 is arranged in a wide working place, and it is not necessary to divide the shielding cover 17, so that it is simpler than the attaching operation on the assembly line. And can be mounted accurately. Further, by attaching the step-shaped shielding cover 17 between the front vertical plate 16A and the rear vertical plate 16B of the building member 16, the shielding cover 17 can increase the rigidity of the building member 16.

  Reference numeral 18 denotes an exhaust gas processing device (see FIGS. 6, 8, etc.) provided on the shielding cover 17. Is attached via. The exhaust gas processing device 18 processes exhaust gas discharged from the engine 9. The exhaust gas treatment device 18 includes a tubular case 18A formed as a circular tubular container extending in the front and rear directions, and an inflow side connecting pipe 18B protruding from the front side (upstream side) of the tubular case 18A toward the engine 9 side. A tail pipe 18C serving as an exhaust port extending upward from the rear side (downstream side) of the tubular case 18A, a processing apparatus main body (not shown) accommodated in the tubular case 18A, and the tubular case 18A The four mounting brackets 18D are provided so as to protrude in the left and right directions.

  Here, the processing apparatus main body accommodated in the tubular case 18A will be described. As the processing apparatus main body, a silencer (exhaust muffler) for reducing the noise of exhaust gas, and particulate matter (PM) contained in the exhaust gas are used. Known are particulate matter removing devices composed of oxidation catalysts and filters for collecting and removing, NOx purifying devices for purifying nitrogen oxides (NOx) contained in exhaust gas using urea aqueous solution, and the like. . These processing apparatus main bodies can be used alone or in combination.

  Then, the exhaust gas processing device 18 attaches a vibration isolating member 19 for the processing device to each mounting bracket 18D, and attaches the vibration isolating member 19 to the processing device mounting portion 17A of the shielding cover 17, whereby the processing device mounting portion. It can be mounted on 17A in a vibration-proof state.

  As a result, the exhaust gas treatment device 18 is attached to the building member 16 that forms a part of the revolving frame 5 and is vibration-proofed to the shielding cover 17, unlike the vibration system of the engine 9 via the shielding cover 17. Anti-vibration is supported via the member 19. Therefore, the vibration of the engine 9 is not transmitted to the exhaust gas treatment device 18 and vibrations generated by the upper swing body 3 during traveling and work are alleviated. Therefore, the catalyst, filter, and sensor built in the exhaust gas treatment device 18 are reduced. Etc. can be protected from vibration.

  Reference numeral 19 denotes an anti-vibration member for, for example, four processing apparatuses provided between the shielding cover 17 and the exhaust gas processing apparatus 18. As shown in FIG. 11, the four vibration isolating members 19 are constituted by an upper mounting portion 19A, a lower mounting portion 19B, and an elastic body 19C provided by connecting the mounting portions 19A and 19B. . Further, as shown in FIG. 8, the upper mounting portion 19A is screwed to the mounting bracket 18D of the exhaust gas processing device 18, and the lower mounting portion 19B is screwed to the processing device mounting portion 17A of the shielding cover 17. . Further, as the vibration isolating member 19 for the processing apparatus, since the exhaust gas processing apparatus 18 is attached to the revolving frame 5 side, a member that is softer and has higher vibration isolating performance than the engine vibration isolating member 9E is used. Yes.

  The processing apparatus subassembly 15 according to the present embodiment configured as described above assembles the building member 16 and attaches the shielding cover 17 to the building member 16. Next, the exhaust gas processing device 18 can be assembled on the processing device mounting portion 17A of the shielding cover 17 via the vibration isolating member 19 to be assembled as a single component. The assembly operation of the processing device subassembly 15 can be performed in a wide place different from the assembly line.

  Then, the processing device subassembly 15 assembled as one part is suspended from the upper side of the hydraulic pump 11 and placed on the revolving frame 5, and the lower part of the building member 16 is placed on the revolving frame 5 in this state. By attaching, the shielding cover 17 and the exhaust gas treatment device 18 can be attached together by a simple operation.

  An exhaust pipe 20 connects the engine 9 and the exhaust gas processing device 18. One end of the exhaust pipe 20 is connected to the supercharger 9 </ b> C of the engine 9 and the other end is a connection pipe of the exhaust gas processing device 18. 18B.

  Reference numeral 21 denotes a flexible pipe provided in the middle of the exhaust pipe 20, and the flexible pipe 21 is a relative displacement between the supercharger 9C of the engine 9 and the exhaust gas processing device 18 (positional deviation between the two). ) And is formed as a flexible material, for example, a bellows-shaped metal cylinder. The flexible tube 21 is integrally fixed to the exhaust pipe 20 using welding means.

  Here, in FIG. 5, FIG. 6, etc., the exhaust pipe 20 and the flexible pipe 21 are illustrated as being assembled as a part of the processing apparatus subassembly 15, but the exhaust pipe 20 and the flexible pipe 21 are connected to the engine 9. It is good also as a structure assembled | attached beforehand to the side.

  The hydraulic excavator 1 according to the present embodiment has the above-described configuration. Next, the operation of the hydraulic excavator 1 will be described.

  First, the operator gets on the cab 6 and sits on the driver's seat. By operating the operating lever in this state, the lower traveling body 2 can be driven to move the hydraulic excavator 1 forward or backward. Further, the operator seated in the driver's seat can perform the excavation work of earth and sand, etc. by operating the operation lever for work to move the working device 4 up and down.

  During operation of the hydraulic excavator 1, the engine 9 vibrates, but the exhaust gas processing device 18 is attached to the revolving frame 5 side via the shielding cover 17 and the building member 16, and the flexible tube 21 is provided in the middle of the exhaust tube 20. By providing, it is separated from the engine 9. Thereby, the exhaust gas treatment device 18 can be protected from vibration of the engine 9.

  Further, the exhaust gas processing device 18 is supported in a vibration-proof manner on the shielding cover 17 via a vibration-proof member 19. As a result, vibrations transmitted to the exhaust gas processing device 18 during traveling of the lower traveling body 2 or working by the working device 4 can be mitigated and can be protected from these vibrations.

  Thus, according to the present embodiment, the two vertical plates 16A and 16B are erected on the revolving frame 5 so as to sandwich the hydraulic pump 11, and the two vertical plates 16A and 16B are The building member 16 can form a pump chamber 8 </ b> C surrounding the hydraulic pump 11 by being connected using the connecting plate 16 </ b> C. Further, the building member 16 can be shielded from the engine 9 and the hydraulic pump 11 by providing a shielding cover 17. In addition, since the shielding cover 17 is provided with the processing device mounting portion 17A, the exhaust gas processing device 18 can be mounted on the processing device mounting portion 17A.

  Therefore, the exhaust gas treatment device 18 can be attached to the building member 16 different from the vibration system of the engine 9 via the shielding cover 17. As a result, the vibration of the engine 9 can be prevented from being transmitted to the exhaust gas treatment device 18, and the devices such as the catalyst, the filter, and the sensor incorporated in the exhaust gas treatment device 18 can be protected from the vibration of the engine 9. And the life can be improved.

  Further, the exhaust gas processing device 18 can be supported in a vibration-proof manner by using a vibration isolation member 19 for the processing device on the processing device mounting portion 17 </ b> A of the shielding cover 17. As a result, it is possible to protect the devices incorporated in the exhaust gas processing device 18 from vibration during traveling and work, and to improve durability and reliability.

  On the other hand, the processing device subassembly 15 can be formed by assembling the shielding cover 17 and the exhaust gas processing device 18 in advance to the building member 16 with the building member 16 as a main material. The processing device subassembly 15 can be attached to the revolving frame 5 as a single component. Therefore, the shielding cover 17 can be easily attached to the revolving frame 5 in a short time without requiring labor for attaching work or dividing into a plurality of members.

  Further, since the shielding cover 17 forms a firewall made of a stepped plate by the processing device mounting portion 17A, the rising plate 17B, and the falling plate 17C, the engine 9 is formed while forming a flat processing device mounting portion 17A. And the hydraulic pump 11 can be shielded.

  Further, since the flexible pipe 21 is provided in the middle of the exhaust pipe 20 of the engine 9, vibrations generated relatively on the engine 9 side and the turning frame 5 side can be absorbed by the deformation of the flexible pipe 21. It is possible to reliably prevent the vibration of the engine 9 from being transmitted to the exhaust gas processing device 18 and improve the durability.

  In the embodiment, the case where the exhaust gas processing device 18 is attached to the processing device mounting portion 17A of the shielding cover 17 via the vibration isolation member 19 in a vibration-proof state has been described as an example. However, the present invention is not limited to this. For example, the exhaust gas processing device 18 may be fixedly attached to the processing device mounting portion 17A of the shielding cover 17 using U bolts, bolts, nuts, or the like.

  In the embodiment, the case where the shielding cover 17 is formed as a stepped plate by bending a single plate has been described as an example. However, the present invention is not limited to this, and the shielding cover may be formed as a stepped plate using a plurality of plate bodies using fixing means such as welding and bolting.

  Further, in the embodiment, the hydraulic excavator 1 including the crawler type lower traveling body 2 is described as an example of the construction machine. However, the present invention is not limited to this, and may be applied to, for example, a hydraulic excavator provided with a wheel-type lower traveling body. Besides, it can be widely applied to other construction machines such as wheel loaders, dump trucks, lift trucks and the like.

It is a front view which shows the hydraulic excavator applied to this Embodiment of this invention. FIG. 2 is an enlarged plan view showing the upper swing body in FIG. 1 with the cab and the like omitted. It is a top view which shows the turning frame in FIG. 2 alone. It is an expanded sectional view which looked at the upper revolving structure from the direction of arrows IV-IV in FIG. It is a top view which expands and shows the processing apparatus subassembly in FIG. It is the external appearance perspective view of the partial fracture | rupture which looked at the processing apparatus subassembly from the left front side. It is the external appearance perspective view of the partial fracture | rupture which looked at the processing apparatus subassembly from the front right side. It is a disassembled perspective view which decomposes | disassembles and shows a processing apparatus subassembly. It is an external appearance perspective view which shows a shielding cover by itself from the left front side. It is an external appearance perspective view which shows a shielding cover by itself from the right front side. It is an external appearance perspective view which expands and shows the vibration isolator for processing apparatuses independently.

Explanation of symbols

1 Excavator (construction machine)
2 Lower traveling body (car body)
3 Upper swing body (car body)
4 working device 5 swivel frame 8A engine room 8B heat exchanger room 8C pump room 9 engine 11 hydraulic pump 15 processing device subassembly 16 building member 16A front vertical plate 16B rear vertical plate 16C connecting plate 17 shielding cover 17A processing device mounting portion 17B Rising plate 17C Falling plate 18 Exhaust gas treatment device 19 Anti-vibration member 20 Exhaust pipe 21 Flexible pipe

Claims (5)

A self-propelled vehicle body, an engine mounted on the vehicle body, a hydraulic pump provided on one side in the longitudinal direction of the engine, and an exhaust gas that is connected to the engine via an exhaust pipe and processes exhaust gas In a construction machine comprising a processing device,
In the vehicle body, in order to form a pump chamber surrounding the hydraulic pump, a building member comprising two vertical plates standing between the hydraulic pumps and a connecting plate connecting the vertical plates is provided. Provided,
The building member is provided with a shielding cover that shields between the engine and the hydraulic pump,
A construction machine characterized in that a processing device mounting portion for mounting the exhaust gas processing device is provided on an upper side of the shielding cover.   The construction machine according to claim 1, wherein the exhaust gas processing device is attached to a processing device mounting portion of the shielding cover, and a vibration isolating member is provided between the processing device mounting portion and the exhaust gas processing device.   A processing device subassembly is formed by assembling the shielding member and the exhaust gas processing device in advance to the building member with the building member as a main material, and the vehicle body as the processing device subassembly as one component. The construction machine according to claim 1, wherein the construction machine is configured to be attached to the machine.   The shielding cover includes the processing device mounting portion formed flat, a rising plate extending upward from an end of the processing device mounting portion opposite to the engine, and an end portion on the engine side of the processing device mounting portion. The construction machine according to claim 1, 2 or 3, which is a firewall formed by a falling plate extending downward from the wall.   The construction machine according to claim 1, 2, 3, or 4, wherein a flexible pipe is provided in the middle of the exhaust pipe connecting the engine and the exhaust gas treatment device.

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