JP2014202024A - Construction machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To mount an exhaust gas after-treatment device on a vehicle body in a state that the device is made into the vibration system same as an engine.SOLUTION: An engine 9 is elastically supported with respect to a revolving frame 5 by providing a vibration-proof member 14 between each of vehicle body side brackets 5H, 5J, 5K, 5L provided on the revolving frame 5 of a revolving super structure 3 and an engine side bracket 12 provided on the engine 9. A screw seat 12D is provided on the engine side bracket 12, each leg 22A of a support table 22 is mounted to the screw seat 12D by using bolts 23, and an exhaust gas after-treatment device 17 is mounted on an upper face part 22B of the support table 22 by using bolts 24. Thereby, the engine 9 and the exhaust gas after-treatment device 17 can be supported on the revolving frame 5 via the common vibration-proof member 14, and the engine 9 and the exhaust gas after-treatment device 17 can be mounted as the same vibration systems on the revolving frame 5.

Description

  The present invention relates to a construction machine such as a hydraulic excavator and a wheel loader, and more particularly to a construction machine provided with an exhaust gas aftertreatment device that performs an aftertreatment on exhaust gas from an engine.

  In general, a hydraulic excavator, which is a typical example of a construction machine, has a vehicle body composed of a self-propelled lower traveling body and an upper revolving body that is turnably mounted on the lower traveling body. Further, a working device for performing excavation work or the like is provided so as to be able to move up and down.

  The upper revolving structure includes a revolving frame forming a support structure, a cab provided on the front side of the revolving frame, an engine mounted on the rear side of the revolving frame, and a length direction of the engine. The hydraulic pump provided on the side of the engine, the exhaust gas aftertreatment device connected to the exhaust side of the engine via an exhaust pipe, and a building cover provided on the swivel frame covering these devices. ing.

  Here, as exhaust gas aftertreatment devices, exhaust gas purification devices that remove harmful substances contained in exhaust gas, silencers (exhaust mufflers) that reduce exhaust gas noise, and the like are known. Exhaust gas purification devices include particulate matter removal devices that remove particulate matter (PM), NOx purification devices that purify nitrogen oxides (NOx), etc., which are used alone or in appropriate combination. can do.

  In recent years, as the size of the engine has increased, the size of the exhaust gas aftertreatment device has also increased. Therefore, a configuration has been adopted in which a heavy exhaust gas aftertreatment device is attached to a structure other than the engine, such as a swivel frame. (See Patent Document 1 and Patent Document 2).

JP 2010-121562 A JP 2010-127094 A

  By the way, when the excavator travels on rough terrain, or when excavation work is performed using the work device, the swing frame of the excavator generates vibration due to vertical movement caused by unevenness of the ground or excavation reaction force of the work device. The engine itself vibrates regardless of the operation of the excavator. For this reason, the swing frame and the engine have different vibration systems (vibration systems).

  Therefore, when the exhaust gas aftertreatment device is attached to the swivel frame, an exhaust pipe that connects the engine and the exhaust gas aftertreatment device to absorb different vibrations between the exhaust gas aftertreatment device and the engine. It is necessary to provide a shock-absorbing joint such as a bellows having flexibility.

  However, as in the prior art described above, when a buffer joint is provided in the middle of the exhaust pipe connecting the engine having different vibration system and the exhaust gas aftertreatment device, the excavator can run or excavate. Occasionally, the vehicle body vibrates greatly, and the shock-absorbing joint repeatedly undergoes large deformation. As a result, the durability of the shock-absorbing joint is affected, and there is a possibility that breakage will occur early.

  The present invention has been made in view of the above-described problems of the prior art, and can be mounted on a vehicle body in a state where the exhaust gas aftertreatment device has the same vibration system as the engine. The reliability and durability of the exhaust gas aftertreatment device can be achieved. It aims at providing the construction machine which can raise.

  In order to solve the above-described problems, the present invention provides a self-propelled vehicle body, an engine mounted on the vehicle body, and a vibration isolating member that is provided between the vehicle body and the engine and elastically supports the engine. And an exhaust gas aftertreatment device that is connected to the engine via an exhaust pipe and performs an aftertreatment on the exhaust gas from the engine.

  A feature of the configuration adopted by the invention of claim 1 is that a support member that is elastically supported by the vibration isolating member together with the engine in a state where the engine is covered from above is provided, and the exhaust gas aftertreatment device includes: , Located on the upper side of the engine and attached to the support member.

  According to a second aspect of the present invention, the support member includes a plurality of legs that are supported on the lower end side by the anti-vibration member and extend upward and downward, and an upper surface that is disposed on the upper end side of each leg and covers the engine from above. The exhaust gas aftertreatment device is configured to be attached to the upper surface portion of the support member.

  According to a third aspect of the present invention, the vibration isolation member is provided between a vehicle body side bracket fixed to the vehicle body and an engine side bracket fixed to the engine, and the support member is The structure is such that it is attached to the engine side bracket.

  According to a fourth aspect of the present invention, the vibration isolation member is provided between a vehicle body side bracket fixed to the vehicle body and an engine side bracket fixed to the engine, and the support member is The structure is such that the vibration-proof member is fastened together with the engine-side bracket.

  According to the first aspect of the present invention, the engine and the exhaust gas aftertreatment device are vibrated in the same manner by elastically supporting the support member to which the exhaust gas aftertreatment device is attached and the engine by the common vibration isolating member. System. Therefore, there is no need to provide a buffer joint for absorbing vibration generated between the engine and the exhaust gas aftertreatment device in the middle of the exhaust pipe.

  On the other hand, since the exhaust gas aftertreatment device is attached to a support member supported by the vibration isolation member independently of the engine, even if the exhaust gas aftertreatment device is increased in size and weight, the exhaust gas aftertreatment device The weight of the device does not adversely affect the engine, and the life of the engine can be extended.

  According to invention of Claim 2, the upper surface part of a support member is arrange | positioned in the position which covers an engine from upper direction in the state which supported the lower end side of each leg part which comprises a Yakura-shaped support member by the vibration proof member. For this reason, by attaching the exhaust gas aftertreatment device to the upper surface of the support member, the exhaust gas aftertreatment device can be elastically supported by the support member directly above the engine. As a result, in a state where the exhaust gas aftertreatment device is disposed in the vicinity of the center of gravity of the engine, the engine and the exhaust gas aftertreatment device can be stably supported by the common vibration isolating member.

  According to the invention of claim 3, the vibration isolating member is disposed between the engine side bracket and the vehicle body, and the support member is attached to the engine side bracket in a state where the engine is elastically supported by the vibration isolating member. it can. Thereby, the engine and the exhaust gas aftertreatment device can be made the same vibration system elastically supported by the common vibration isolating member. In addition, since the weight of the exhaust gas aftertreatment device attached to the support member does not act on the engine, the weight of the exhaust gas aftertreatment device can be prevented from adversely affecting the engine, and the life of the engine can be extended.

  According to the invention of claim 4, the engine and the exhaust gas aftertreatment device are commonly used by fastening the engine and the support member together to the vibration isolation member and attaching the exhaust gas aftertreatment device to the support member. The same vibration system elastically supported by the vibration isolating member can be used. In this case, since the engine and the support member can be simultaneously attached (co-fastened) to the vibration isolation member, workability when the support member is attached can be improved.

It is a front view which shows the hydraulic shovel applied to the 1st Embodiment of this invention. It is a top view which shows the turning frame of a hydraulic shovel alone. It is a perspective view which shows a turning frame, an engine, a vibration isolator, a support stand, an exhaust gas aftertreatment device, and the like. It is a top view which shows the state which attached the engine, the support stand, and the exhaust-gas aftertreatment apparatus to the turning frame. It is the side view which looked at the turning frame, the engine, the vibration isolating member, the support base, the exhaust gas aftertreatment device from the direction of arrows VV in FIG. It is a disassembled perspective view which shows an engine side bracket, a vibration isolator, etc. It is the front view which looked at the turning frame, the engine, the vibration isolator, the support stand, the exhaust gas aftertreatment device from the direction of arrows VII-VII in FIG. FIG. 8 is an exploded view showing the swivel frame, the engine, the vibration isolating member, the support base, and the exhaust gas aftertreatment device in FIG. 7 in an exploded state. FIG. 8 is a front view similar to FIG. 7 showing a turning frame, an engine, a vibration isolating member, a support base, an exhaust gas aftertreatment device, and the like according to a second embodiment. FIG. 10 is an exploded view showing the swivel frame, the engine, the vibration isolation member, the support base, and the exhaust gas aftertreatment device in FIG. 9 in an exploded state. It is a side view similar to FIG. 5 which shows the modification of this invention.

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

  1 to 8 show a first embodiment of the present invention. In FIG. 1, reference numeral 1 denotes a hydraulic excavator as a typical example of a construction machine. The hydraulic excavator 1 includes a crawler-type lower traveling body 2 that can be self-propelled and an upper revolving body 3 that is rotatably mounted on the lower traveling body 2. A working device 4 is provided on the front side of the upper swing body 3 so as to be able to move up and down. The working device 4 performs excavation work of earth and sand.

  The upper swing body 3 is a swing frame 5 serving as a base mounted on the lower traveling body 2 so as to be swingable, and a counterweight 6 provided on the rear end side of the swing frame 5 to balance the weight with the work device 4. And a cab 7 on the left side of the front part of the swivel frame 5 on which an operator gets on, a front side of the counterweight 6, and an engine 9, an exhaust gas aftertreatment device 17, a support base 22 and the like, which will be described later, are accommodated therein. The building cover 8 is generally configured.

  As shown in FIG. 2, the swivel frame 5 has a thick bottom plate 5A extending in the front and rear directions, and is erected on the bottom plate 5A while facing the left and right directions in the front and rear directions. A left vertical plate 5B, a right vertical plate 5C, a plurality of left extending beams 5D extending to the left from the bottom plate 5A and the left vertical plate 5B, and a plurality of right extending beams 5E extending to the right from the bottom plate 5A and the right vertical plate 5C. And a left side frame 5F extending forward and rearward attached to the front end side of each left extending beam 5D, and a right side frame 5G extending frontward and rearward attached to the front end side of each right extending beam 5E. Has been.

  The working device 4 is attached to the front end sides of the left and right vertical plates 5B and 5C, and the counterweight 6 is attached to the rear end sides of the left and right vertical plates 5B and 5C. In addition, on the rear side of the left and right vertical plates 5B and 5C, four vehicle body side brackets 5H, 5J, 5K, and 5L are provided between the vertical plates 5B and 5C for mounting an engine 9 described later. Is provided.

  Reference numeral 9 denotes an engine provided on the rear side of the turning frame 5. The engine 9 is constituted by a diesel engine and is mounted on the turning frame 5 with a crankshaft (not shown) extending horizontally in the left and right directions. Has been. A cooling fan 9A driven by the engine 9 is provided on the left side of the engine 9, and a heat exchanger such as a radiator and an oil cooler (both shown in the figure) is cooled by the cooling air sucked into the building cover 8 by the rotation of the cooling fan 9A. (Not shown) can be cooled. On the other hand, a hydraulic pump 10 is provided on the right side of the engine 9, and the hydraulic pump 10 is driven by the engine 9, so that operating hydraulic oil is directed toward various hydraulic devices mounted on the hydraulic excavator 1. To be discharged.

  Here, the exhaust gas discharged from the engine 9 is discharged to the outside through the exhaust pipe 11 connected to the exhaust side of the engine 9, but the exhaust gas of the engine 9, which is a diesel engine, includes nitrogen oxide (NOx). ) And other harmful substances. For this reason, an exhaust gas aftertreatment device 17 to be described later is connected to the exhaust pipe 11 of the engine 9 and the exhaust gas aftertreatment device 17 is configured to remove harmful substances.

  Reference numeral 12 denotes a plurality of engine side brackets provided on the engine 9, and these engine side brackets 12 correspond to the four vehicle body side brackets 5 H, 5 J, 5 K, and 5 L provided on the turning frame 5 in total. Is provided. Each of the engine side brackets 12 is attached to the vehicle body side brackets 5H, 5J, 5K, and 5L of the revolving frame 5 via a vibration isolation member 14 described later.

  Here, as shown in FIG. 6, the engine-side bracket 12 is formed in an approximately L-shape by a rectangular side plate 12A extending upward and downward and a lower plate 12B extending horizontally from the lower end side of the side plate 12A. The side plate 12A and the lower plate 12B are connected by a pair of triangular reinforcing plates 12C. The engine side bracket 12 is provided integrally with the engine 9 by fixing the side plate 12A to the outer wall surface of the engine 9 using four bolts 13.

  One bolt insertion hole 12B1 is drilled upward and downward in the center of the lower plate 12B of the engine side bracket 12. The bolt insertion hole 12B1 has an upper mounting bolt for an anti-vibration member 14 to be described later. 14B is inserted. On the other hand, a screw seat 12D having a rectangular parallelepiped block shape is fixed to the upper and lower intermediate portions of the side plate 12A by means of welding or the like. For example, two female screw holes 12D1 are formed in the screw seat 12D. Is screwed.

  Reference numeral 14 denotes four vibration isolation members provided between the respective vehicle body side brackets 5H, 5J, 5K, and 5L provided on the turning frame 5 and the respective engine side brackets 12 provided on the engine 9. This anti-vibration member 14 is also called an anti-vibration mount. Each of these vibration isolation members 14 elastically supports the engine 9 with respect to the revolving frame 5.

  Here, the vibration isolating member 14 is formed in a cylindrical shape using an elastic body such as rubber, and is elastically deformed by receiving a load and elastically deforming, and upwards upward of the elastically deforming portion 14A. The upper mounting bolt 14B projecting downward and the lower mounting bolt 14C projecting downward from the lower portion of the elastically deforming portion 14A.

  The lower mounting bolts 14 </ b> C of the vibration isolation member 14 are inserted into the vehicle body side brackets 5 </ b> H, 5 </ b> J, 5 </ b> K, and 5 </ b> L of the revolving frame 5 and are fixed using nuts 15. On the other hand, the upper mounting bolt 14 </ b> B of the vibration isolation member 14 is inserted into a bolt insertion hole 12 </ b> B <b> 1 provided in the lower plate 12 </ b> B of the engine side bracket 12 and is fixed to the engine side bracket 12 using a nut 16.

  In this way, each vibration isolation member 14 is provided between each vehicle body side bracket 5H, 5J, 5K, 5L of the turning frame 5 and each engine side bracket 12 of the engine 9, and excavation is performed when the excavator 1 travels. The vibration transmitted from the upper swing body 3 to the engine 9 during work is reduced by elastically deforming the elastic deformation portion 14A.

  Next, reference numeral 17 denotes an exhaust gas aftertreatment device connected to the exhaust side of the engine 9 via the exhaust pipe 11. The exhaust gas aftertreatment device 17 is disposed on the upper side of the engine 9 by being attached to a support base 22 described later, and performs an aftertreatment on the exhaust gas discharged from the engine 9.

  Here, the exhaust gas aftertreatment device 17 includes a first aftertreatment device 18 having a cylindrical shape extending in the left and right directions and a rear side of the first aftertreatment device 18 having a cylindrical shape extending in the left and right directions. Are substantially constituted by a second post-processing device 19 arranged in parallel with each other and a connecting pipe 20 connecting the first post-processing device 18 and the second post-processing device 19.

  The first post-processing device 18 includes, for example, a particulate matter removing device, and has a cylindrical case 18A extending in the left and right directions, and a particulate matter removing filter (see FIG. 5) disposed in the cylindrical case 18A. (Not shown). The outlet of the exhaust pipe 11 is connected to one side (right side) of the cylindrical case 18A in the length direction, and the inlet of the connection pipe 20 is connected to the other side (left side) of the cylindrical case 18A in the length direction. Is connected. The first aftertreatment device 18 removes particulate matter (PM) in the exhaust gas flowing into the cylindrical case 18A through the exhaust pipe 11 by collecting and burning the particulate matter with a particulate matter removal filter. To do.

  The second aftertreatment device 19 is composed of, for example, a NOx purification device and a silencer, and has a cylindrical case 19A extending in the left and right directions, a urea selective reduction catalyst disposed in the cylindrical case 19A, an oxidation It comprises a catalyst and an exhaust muffler (both not shown). The outlet of the connecting pipe 20 is connected to one side (right side) of the cylindrical case 19A in the length direction, and the exhaust gas from which the particulate matter has been removed by the first aftertreatment device 18 passes through the connecting pipe 20. It flows into the cylindrical case 19A of the second post-processing device 19. Further, on the other side (left side) in the length direction of the cylindrical case 19A, a tail pipe 19B that discharges the exhaust gas after-treatment into the atmosphere is projected upward.

  The urea selective reduction catalyst arranged in the cylindrical case 19A of the second aftertreatment device 19 selectively reduces nitrogen oxide contained in the exhaust gas by ammonia hydrolyzed from urea water. And nitrogen oxides are removed from the exhaust gas by decomposition into water. In addition, the oxidation catalyst oxidizes and decomposes excess ammonia that cannot react with nitrogen oxides. Further, the exhaust muffler leads to the tail pipe 19B after suppressing the noise of the exhaust gas from which nitrogen oxides have been removed.

  Reference numeral 21 denotes a mounting substrate provided in the exhaust gas aftertreatment device 17, which is a cylindrical case 18 A constituting the first aftertreatment device 18 and a cylindrical shape constituting the second aftertreatment device 19. It is provided integrally with the case 19A. As shown in FIG. 5, the lower end side of the mounting substrate 21 is bolted to a screw seat 22 </ b> D of a support base 22 to be described later, whereby the exhaust gas aftertreatment device 17 is mounted on the support base 22. Yes.

  Next, a support base used in the present embodiment for disposing the exhaust gas aftertreatment device 17 above the engine 9 will be described.

  Reference numeral 22 denotes a support base as a support member to which the exhaust gas aftertreatment device 17 is attached. The support base 22 is elastically supported by the vibration isolation members 14 together with the engine 9 in a state where the engine 9 is covered from above. Here, the support base 22 is disposed at a position corresponding to each engine-side bracket 12 of the engine 9, and has four flat leg portions 22 </ b> A extending upward and downward, and the four leg portions 22 </ b> A. A flat upper surface portion 22B which is disposed on the upper end side and extends in the horizontal direction and covers the engine 9 from above is formed in an arrow shape across the engine 9 as a whole.

  At the lower end side of each leg portion 22A, two bolt insertion holes 22C corresponding to the two female screw holes 12D1 screwed into the screw seat 12D of the engine side bracket 12 are formed. The inserted bolts 23 are screwed into the female screw holes 12 </ b> D <b> 1 of the engine side bracket 12, whereby each leg 22 </ b> A is fixed to the engine side bracket 12. Therefore, the support base 22 is configured to be elastically supported by the vibration isolation member 14 via the engine side bracket 12 in a state where the engine 9 is covered from above by the upper surface portion 22B.

  On the other hand, a plurality of screw seats 22D having a block shape are fixed to the upper surface side of the upper surface portion 22B by means such as welding. Therefore, the exhaust gas aftertreatment device 17 is attached to the upper surface portion 22B of the support base 22 by attaching the lower end side of the mounting substrate 21 provided in the exhaust gas aftertreatment device 17 to each screw seat 22D using the bolts 24. be able to.

  Thus, the engine 9 and the exhaust gas aftertreatment device are attached by attaching each leg portion 22A of the support base 22 to the engine side bracket 12 and attaching the exhaust gas aftertreatment device 17 to the upper surface side of the upper surface portion 22B of the support base 22. 17 can be elastically supported via a common vibration isolating member 14, and both can be mounted on the turning frame 5 as the same vibration system.

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

  First, the operator gets on the cab 7 and operates the engine 9. The operator can drive the hydraulic excavator 1 by operating a travel operation lever (not shown) disposed in the cab 7 and operate a work operation lever (not shown). By doing so, excavation work of earth and sand can be performed using the work device 4.

  During the operation of the engine 9, exhaust gas containing particulate matter (PM) and nitrogen oxides (NOx), which are harmful substances, is discharged, and the exhaust gas passes through the exhaust pipe 11 and is in the cylindrical shape of the first aftertreatment device 18. It flows into the case 18A. On the other hand, a particulate matter removing filter (not shown) arranged in the cylindrical case 18A collects particulate matter contained in the exhaust gas and burns and removes it.

  The exhaust gas from which the particulate matter has been removed by the first aftertreatment device 18 is guided to the second aftertreatment device 19 through the connecting pipe 20, and urea water is injected from a urea water injection valve (not shown). As a result, the ammonia water exhausted from urea water or ammonia hydrolyzed from urea water is mixed and discharged into the cylindrical case 19A.

  A urea selective reduction catalyst (not shown) arranged in the cylindrical case 19A of the second aftertreatment device 19 selectively converts nitrogen oxides contained in the exhaust gas by ammonia hydrolyzed from urea water. Nitrogen oxides are removed from the exhaust gas by reducing it to nitrogen and water. The exhaust gas from which nitrogen oxides have been removed is discharged to the outside through the tail pipe 19B after noise is suppressed by the exhaust muffler. Thus, the exhaust gas aftertreatment device 17 can reduce the discharge amount of particulate matter and nitrogen oxides contained in the exhaust gas.

  By the way, when the excavator 1 travels on rough terrain, or when excavation work is performed using the work device 4, the swing frame 5 of the upper swing body 3 moves up and down the lower travel body 2 due to the unevenness of the ground and the work device. 4 generates vibration due to the excavation reaction force, and the engine 9 itself generates vibration regardless of the operation of the hydraulic excavator 1. Therefore, the swing frame 5 and the engine 9 have different vibration systems (vibration systems).

  On the other hand, in the present embodiment, each leg portion 22A of the support base 22 is attached to the engine side bracket 12 provided in the engine 9, thereby preventing the engine 9 and the support base 22 from being against the turning frame 5. The structure is configured such that the exhaust gas aftertreatment device 17 is attached to the upper surface portion 22B of the support base 22 by elastically supporting the vibration member 14.

  As a result, the engine 9 and the exhaust gas aftertreatment device 17 can be supported on the revolving frame 5 via the common vibration isolating member 14, and the engine 9 and the exhaust gas aftertreatment device 17 have the same vibration system. can do. Therefore, it is necessary to provide a buffer joint for absorbing vibration generated between the engine 9 and the exhaust gas aftertreatment device 17 in the middle of the exhaust pipe 11 connecting the engine 9 and the exhaust gas aftertreatment device 17. Therefore, the leakage of the exhaust gas due to the damage of the buffer joint can be suppressed. As a result, harmful substances contained in the exhaust gas can be appropriately removed by the exhaust gas aftertreatment device 17, and the reliability of the exhaust gas aftertreatment device 17 can be improved.

  Moreover, since the exhaust gas aftertreatment device 17 is attached to the support base 22 supported by the vibration isolation member 14 independently of the engine 9, even if the exhaust gas aftertreatment device 17 is increased in size and weight is increased, The weight of the exhaust gas aftertreatment device 17 does not adversely affect the engine 9 and the life of the engine 9 can be extended.

  Further, the support base 22 is formed in an arrow shape by four leg portions 22A corresponding to the four engine side brackets 12 and an upper surface portion 22B provided on the upper end side of each leg portion 22A across the engine 9. The exhaust gas aftertreatment device 17 can be elastically supported directly above the engine 9 by attaching the exhaust gas aftertreatment device 17 to the upper surface portion 22B of the support base 22. As a result, the engine 9 and the exhaust gas aftertreatment device 17 can be stably supported by the common vibration isolation member 14 in a state where the exhaust gas aftertreatment device 17 is disposed in the vicinity of the center of gravity of the engine 9. .

  Furthermore, each leg portion 22A of the support base 22 is configured to be attached to the screw seat 12D of the engine side bracket 12 by using the bolt 23, so that the engine 9 is attached to the revolving frame 5 via the vibration isolation member 14. The operation of attaching the support base 22 to the engine side bracket 12 can be performed separately.

  Next, FIGS. 9 and 10 show a second embodiment of the present invention. The feature of this embodiment is that a support member for supporting an exhaust gas aftertreatment device is attached to a vibration isolating member together with an engine side bracket. It is in the structure which tightens together. In the present embodiment, the same components as those in the first embodiment described above are denoted by the same reference numerals, and the description thereof is omitted.

  In the figure, reference numeral 31 denotes four engine side brackets provided on the engine 9, and these engine side brackets 31 are used in this embodiment in place of the engine side bracket 12 according to the first embodiment. is there.

  Here, the engine side bracket 31 includes a side plate 31A extending in the upward and downward direction, a lower plate 31B projecting in the horizontal direction from the lower end side of the side plate 31A, and the side plate in substantially the same manner as in the first embodiment. This is roughly constituted by a pair of reinforcing plates 31C that connect between 31A and the lower plate 31B. However, the engine side bracket 31 is different from the engine side bracket 12 according to the first embodiment in that a screw seat is not provided on the side plate 31A.

  The engine side bracket 31 is provided integrally with the engine 9 by fixing the side plate 31 </ b> A to the outer wall surface of the engine 9 using the four bolts 13. A bolt insertion hole 31B1 through which the upper mounting bolt 14B of the vibration isolation member 14 is inserted is formed in the lower plate 31B of the engine side bracket 31.

  Reference numeral 32 denotes a support base for supporting the exhaust gas aftertreatment device 17, and the support base 32 is used in this embodiment in place of the support base 22 according to the first embodiment. Here, the support base 32 has four leg portions 32A arranged at positions corresponding to the four engine-side brackets 31 and these four, almost like the support base 22 according to the first embodiment. A flat upper surface portion 32B disposed on the upper end side of the leg portion 32A and covering the engine 9 from above is formed in an arrow shape across the engine 9 as a whole.

  The lower end side of each leg portion 32A is a bent portion 32C that is bent in the horizontal direction so as to face the lower plate 31B of the engine-side bracket 31. The bent portion 32C includes a lower plate of the engine-side bracket 31. One bolt insertion hole 32D corresponding to the bolt insertion hole 31B1 provided in 31B is provided.

  Then, the upper mounting bolt 14B of the vibration isolation member 14 attached to each of the vehicle body side brackets 5H, 5J, 5K, and 5L using the nut 15 is supported by a bolt insertion hole 31B1 provided in the lower plate 31B of the engine side bracket 31 and By inserting the nut 16 into the upper mounting bolt 14 </ b> B through the bolt insertion hole 32 </ b> D provided in the bent portion 32 </ b> C of the base 32, the support base 32 and the engine side bracket 31 are attached to the vibration isolating member 14. Can be fastened together. Accordingly, the support base 32 is configured to be elastically supported through the common vibration isolation member 14 together with the engine side bracket 31 in a state where the engine 9 is covered from above by the upper surface portion 32B.

  On the other hand, a plurality of screw seats 32E having a block shape are fixed to the upper surface side of the upper surface portion 32B of the support base 32 using means such as welding. Therefore, the exhaust gas aftertreatment device 17 is attached to the upper surface portion 32B of the support base 32 by attaching the lower end side of the mounting substrate 21 provided in the exhaust gas aftertreatment device 17 to each screw seat 32E using the bolt 24. be able to.

  In this way, the bent portions 32C of the leg portions 32A constituting the support base 32 are attached to the vibration isolation member 14 together with the engine side bracket 31, and the exhaust gas post-processing is performed on the upper surface side of the upper surface portion 32B of the support base 32. By attaching the device 17, the engine 9 and the exhaust gas aftertreatment device 17 can be elastically supported via the common vibration isolation member 14, and both are mounted on the revolving frame 5 as the same vibration system. It has a configuration that can.

  The hydraulic excavator according to the present embodiment has the above-described configuration. Also in this embodiment, the engine 9 and the exhaust gas aftertreatment device 17 are placed on the swivel frame 5 via the common vibration isolation member 14. The engine 9 and the exhaust gas aftertreatment device 17 can be made the same vibration system. Therefore, there is no need to provide a buffer joint in the middle of the exhaust pipe 11 connecting the engine 9 and the exhaust gas aftertreatment device 17, and leakage of exhaust gas due to breakage of the buffer joint can be suppressed. As a result, harmful substances contained in the exhaust gas can be appropriately removed by the exhaust gas aftertreatment device 17, and the reliability of the exhaust gas aftertreatment device 17 can be improved.

  Moreover, according to the present embodiment, the support base is inserted by inserting the bolt insertion hole 31B1 of the engine side bracket 31 and the bolt insertion hole 32D of the support base 32 into the upper mounting bolt 14B of the vibration isolating member 14. 32 can be fastened together with the vibration isolation member 14 together with the engine side bracket 31. As a result, the work for attaching the engine 9 to the revolving frame 5 via the vibration isolating member 14 and the work for attaching the support base 32 via the vibration isolating member 14 can be performed at the same time, thereby improving the workability. Can do.

  In the first embodiment described above, a case where only the exhaust gas aftertreatment device 17 is attached to the support base 22 that covers the engine 9 from above is illustrated. However, the present invention is not limited to this. For example, as in a modification shown in FIG. 11, a fan guard 33 that covers the cooling fan 9 </ b> A of the engine 9 from the front side is attached to the support base 22 via the bracket 34. Also good. The same applies to the support base 32 according to the second embodiment.

  In the above-described embodiment, the exhaust gas aftertreatment device 17 includes the first aftertreatment device 18 in which the particulate matter removing filter is disposed in the cylindrical case 18A, and the urea selective reduction catalyst in the cylindrical case 19A. In this example, a second post-treatment device 19 provided with an oxidation catalyst and an exhaust muffler is connected via a connecting pipe 20. However, the present invention is not limited to this. For example, an exhaust gas aftertreatment device in which a particulate matter removal filter, a urea selective reduction catalyst, an oxidation catalyst, and an exhaust muffler are arranged in a single cylindrical case is used as the support base 22 (32 It is good also as a structure attached to ().

  Further, in each of the above-described embodiments, the crawler hydraulic excavator 1 is described as an example of the construction machine. However, the present invention is not limited to this, and can be widely applied to other construction machines such as a wheel-type hydraulic excavator, a wheel loader, and a hydraulic crane.

2 Lower traveling body (car body)
3 Upper swing body (car body)
DESCRIPTION OF SYMBOLS 5 Turning frame 5H, 5J, 5K, 5L Car body side bracket 9 Engine 11 Exhaust pipe 12, 31 Engine side bracket 14 Anti-vibration member 17 Exhaust gas aftertreatment device 18 1st aftertreatment device 19 2nd aftertreatment device 22, 32 Support stand (support member)
22A, 32A Leg 22B, 32B Top surface

Claims (4)

A self-propelled vehicle body, an engine mounted on the vehicle body, a vibration isolating member provided between the vehicle body and the engine and elastically supporting the engine, and connected to the engine via an exhaust pipe In a construction machine comprising an exhaust gas aftertreatment device that performs an aftertreatment on exhaust gas from the engine,
A support member that is elastically supported by the vibration isolation member together with the engine in a state of covering the engine from above is provided.
The exhaust gas aftertreatment device is located on the upper side of the engine and is attached to the support member. The support member is shaped like an arrow having a plurality of legs that are supported on the lower end side by the vibration isolation member and extending upward and downward, and an upper surface part that is disposed on the upper end side of each leg and covers the engine from above. Forming,
The construction machine according to claim 1, wherein the exhaust gas aftertreatment device is configured to be attached to an upper surface portion of the support member. The vibration isolating member is configured to be provided between a vehicle body side bracket fixed to the vehicle body and an engine side bracket fixed to the engine,
The construction machine according to claim 1, wherein the support member is configured to be attached to the engine side bracket. The vibration isolating member is configured to be provided between a vehicle body side bracket fixed to the vehicle body and an engine side bracket fixed to the engine,
The construction machine according to claim 1, wherein the support member is configured to be fastened together with the vibration isolation member together with the engine side bracket.

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