JP6371691B2 - Construction machinery - Google Patents

Description

  The present invention relates to a construction machine such as a hydraulic excavator provided with an exhaust gas aftertreatment device in an exhaust pipe of an engine, for example.

  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. Is provided with a working device for excavating work and the like so as to be able to move up and down.

  The upper swing body includes a swing frame forming a support structure, a cab provided on the front side of the swing frame, on which an operator gets on, an engine mounted on the rear side of the swing frame, and a hydraulic pump attached to the engine And an exhaust gas after-treatment device connected to the exhaust side of the engine via an exhaust pipe, and a building cover provided on the swivel frame so as to cover these devices.

  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, exhaust gas after-treatment devices tend to be larger in order to comply with exhaust gas regulations. Therefore, a configuration is adopted in which a heavy exhaust gas aftertreatment device is attached to a structure other than the engine, for example, a structure such as a turning frame (see, for example, Patent Document 1).

JP 2014-148858 A

  By the way, in the above-mentioned prior art, since the exhaust gas aftertreatment device is attached to the swivel frame via the mounting frame, there is a possibility that an mounting error occurs between the mounting frame and the engine. As a result, when the engine and the exhaust gas aftertreatment device are connected by an exhaust pipe, there is a problem that positional displacement occurs and it is difficult to connect the exhaust pipe.

  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 provide a construction machine that can improve the accuracy of attaching an exhaust pipe that connects between an engine and an exhaust gas aftertreatment device. There is.

  In order to solve the above-described problems, the present invention provides a vehicle body frame that forms a support structure for a vehicle body, an engine mounted on the vehicle body frame in a laterally extending manner in the left and right directions, and the left and right sides of the engine. A hydraulic pump located on one side of the direction and attached to the engine; an exhaust gas aftertreatment device connected to the engine via an exhaust pipe for treating exhaust gas from the engine; and the vehicle body frame. A post-processing device mounting base to which the exhaust gas post-processing device is mounted, and the vehicle body frame has a bottom plate and left and right vertical plates standing on the bottom plate and extends in the front and rear directions And the left and right side frames disposed on both the left and right sides of the center frame and extending in the front and rear directions, and the left and right side frames and the center frame are connected to each other. In the construction machine comprising a plurality of projecting beams extending in the left and right directions at intervals in the rearward direction and a plurality of engine support brackets provided on the center frame and supporting the engine via vibration isolation members, The processing apparatus mounting stand includes a frame-side front support leg attached to a front extension beam located on the front side of the hydraulic pump among the extension beams, and a rear extension located on the rear side of the hydraulic pump among the extension beams. A frame-side rear support leg attached to the beam, an engine-side support leg attached to the front extension beam and attached to any one of the engine support brackets, the frame-side front support leg, Frame side rear support leg, and exhaust gas aftertreatment device fixed to engine side support leg It is characterized by being configured by the mounting base to be mounted.

  ADVANTAGE OF THE INVENTION According to this invention, the attachment precision of the exhaust pipe which connects between an engine and an exhaust-gas aftertreatment apparatus can be improved.

1 is a front view showing a hydraulic excavator to which an embodiment of the present invention is applied. It is a top view which shows an upper revolving body in the state where a cab, a building cover, etc. were omitted. It is an enlarged plan view showing an engine, an exhaust pipe, an exhaust gas aftertreatment device, and the like. It is a perspective view which shows a revolving frame, an engine, an aftertreatment device mounting stand, and an exhaust gas aftertreatment device. It is sectional drawing which looked at the turning frame, the engine, the aftertreatment device mounting stand, and the exhaust gas aftertreatment device from the arrow VV direction in FIG. FIG. 5 is an enlarged front view of the swivel frame, the hydraulic pump, the post-processing device mounting base, and the exhaust gas post-processing device as viewed from the direction of arrows VI-VI in FIG. 4. It is the perspective view which looked at the turning frame and the post-processing apparatus attachment stand from the diagonally right rear. It is the perspective view which looked at the turning frame and the post-processing apparatus attachment stand from the diagonally right front. It is a disassembled perspective view which shows the state which removed the post-processing apparatus attachment stand from the turning frame. It is a perspective view which shows a post-processing apparatus attachment stand alone. It is sectional drawing which shows roughly the internal structure of an exhaust-gas aftertreatment apparatus.

  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. In the present embodiment described below, in the excavator 1 described later, the front and rear directions are defined with the cab 7 side of the revolving frame 5 being the front (front side) and the counterweight 6 side being the rear (rear side). The width direction in the revolving frame 5 is defined as the left and right directions, the cab 7 side is defined as the left side, and the opposite side to the cab 7 is defined as the right side.

  In FIG. 1, a 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. The 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, and the working device 4 can perform excavation work of earth and sand.

  The upper swing body 3 is provided on the rear end side of the swing frame 5 as a body frame that is mounted on the lower traveling body 2 so as to be swingable, and a counterweight that balances the weight with the work device 4. 6, a cab 7 provided on the left side of the front portion of the swivel frame 5, and provided on the front side of the counterweight 6. An engine 9, an exhaust gas aftertreatment device 14, and an aftertreatment device mounting base 25, which will be described later. And a building cover 8 that accommodates the like.

  As shown in FIG. 4, the swivel frame 5 is disposed at the center in the left and right directions and extends in the front and rear directions, and the center frame 5A is disposed on both the left and right sides of the center frame 5A. The left side frame 5 </ b> B and the right side frame 5 </ b> C extending in the direction are roughly configured. Here, the center frame 5A includes a thick bottom plate 5A1, and a left vertical plate 5A2 and a right vertical plate 5A3 which are erected on the bottom plate 5A1 and extend in the front and rear directions while facing in the left and right directions. It consists of

  Between the center frame 5A and the left side frame 5B, a plurality of left extending beams 5D1, 5D2, 5D3, 5D4, 5D5 extending in the left and right directions are provided at intervals in the front and rear directions. The left side frame 5B is attached to the center frame 5A via 5D1, 5D2, 5D3, 5D4, and 5D5. On the other hand, between the center frame 5A and the right side frame 5C, a plurality of right extending beams 5E1, 5E2, 5E3, 5E4 extending in the left and right directions are provided at intervals in the front and rear directions. The right side frame 5C is attached to the center frame 5A via 5E1, 5E2, 5E3, 5E4.

  Here, as shown in FIG. 9, the right front extension beam 5E3 located in the vicinity of the right front engine support bracket 5L described later has four bolt insertion holes 5F penetrating upward and downward on the right side frame 5C side. It has been drilled. The bolt insertion hole 5F is for attaching a frame-side front support leg 26 described later to the right front extension beam 5E3. The right front extending beam 5E3 is provided with two female screw holes 5G penetrating upward and downward on the front side of the right front engine support bracket 5L. This female screw hole 5G is for attaching an engine side support leg 31 to be described later to the right front extending beam 5E3.

  Further, in the right rear overhanging beam 5E4 located in the vicinity of the right rear engine support bracket 5M described later, three bolt insertion holes 5H penetrating upward and downward are formed to be spaced apart in the left and right directions. Yes. The bolt insertion hole 5H is for attaching a frame side rear support leg 29 described later to the right rear extension beam 5E4.

  On the rear side of the center frame 5A, a left front engine support bracket 5J and a left rear engine support bracket 5K disposed near the left vertical plate 5A2 between the left vertical plate 5A2 and the right vertical plate 5A3 are forward and rearward. Are spaced apart from each other. Further, between the right vertical plate 5A3 and the right side frame 5C, a right front engine support bracket 5L and a right rear engine support bracket 5M are provided spaced apart in the front and rear directions near the right vertical plate 5A3. . These four engine support brackets 5J, 5K, 5L, and 5M support the engine 9 via a vibration isolation member 10 described later.

  Here, as shown in FIGS. 7 and 9, the right front engine support bracket 5L includes a substantially L-shaped front plate 5L1 extending from the right vertical plate 5A3 toward the right side and bending upward, and the front plate. 5L1, the rear plate 5L2 facing the front and rear directions, and the upper plate 5L3 connecting the upper ends of the front plate 5L1 and the rear plate 5L2. The front plate 5L1 is provided with a screw seat 5N protruding toward the front side. In the screw seat 5N, two female screw holes 5N1 penetrating in the front and rear directions are formed so as to be spaced apart in the upward and downward directions. The female screw hole 5N1 is for attaching an engine side support leg 31 described later to the right front engine support bracket 5L.

  The engine 9 is provided on the rear side of the turning frame 5. The engine 9 is a diesel engine. The engine 9 elastically supports the left front engine support bracket 5J, the left rear engine support bracket 5K, the right front engine support bracket 5L, and the right rear engine support bracket 5M provided on the revolving frame 5 via vibration isolation members 10, respectively. A crankshaft (not shown) is supported and is mounted on the revolving frame 5 in a horizontally placed state extending in the left and right directions.

  Here, a hydraulic pump 11 is attached to one side (right side) of the engine 9 in the left and right directions. The hydraulic pump 11 is driven by the engine 9 to discharge pressure oil for operation toward various hydraulic devices mounted on the hydraulic excavator 1. Further, a cooling fan 9A driven by the engine 9 is provided on the other side (left side) of the engine 9 in the left and right directions, and the radiator is driven by the cooling air sucked into the building cover 8 by the rotation of the cooling fan 9A. The heat exchanger 12 such as an oil cooler can be cooled (see FIG. 2).

  Here, the exhaust gas discharged from the engine 9 is discharged to the outside through the exhaust pipe 13 connected to the exhaust side of the engine 9. Specifically, the exhaust pipe 13 is connected to the engine 9 at the base end side, extends in the left and right directions on the front side of the engine 9, and has a horizontal pipe line portion 13 </ b> A whose middle part is inclined upward, A bent pipe that is connected to the horizontal pipe section 13A on the front side of the first exhaust gas aftertreatment device 15 and above the second exhaust gas aftertreatment device 20 and the connecting pipe 18 and bent in a U-shape toward the rear. It is comprised by the part 13B. The distal end side of the bent duct portion 13B is connected to the first exhaust gas aftertreatment device 15.

  Thereby, harmful substances such as nitrogen oxides (NOx) contained in the exhaust gas of the engine 9 are discharged to the exhaust gas aftertreatment device 14 through the exhaust pipe 13, and the exhaust gas aftertreatment device 14 causes the harmful substances. Is removed.

  The exhaust gas aftertreatment device 14 is connected to the engine 9 via the exhaust pipe 13. The exhaust gas aftertreatment device 14 treats exhaust gas from the engine 9. Here, the exhaust gas aftertreatment device 14 includes a first exhaust gas aftertreatment device 15 and a second exhaust gas aftertreatment device 20 which will be described later, via an aftertreatment device mounting base 25 which will be described later. It is configured to be mounted on the swivel frame 5.

  The first exhaust gas aftertreatment device 15 is connected to the outlet side of the exhaust pipe 13. The first exhaust gas aftertreatment device 15 is disposed above the hydraulic pump 11 together with the second exhaust gas aftertreatment device 20 described later. Further, the first exhaust gas post-treatment device 15 is mounted on a mounting base 34 described later, positioned above the second exhaust gas post-treatment device 20. The first exhaust gas aftertreatment device 15 includes a cylindrical body 16 extending in the front and rear directions.

  The cylinder 16 is formed as a sealed container with both ends closed. A tubular inflow port 16A that protrudes radially outward (right side) of the cylinder body 16 is provided at a front side portion that is an upstream side of the cylinder body 16, and a bent pipe portion 13B of the exhaust pipe 13 is provided at the inflow port 16A. It is connected. On the other hand, two brackets 16B are fixed to the outer peripheral side of the cylindrical body 16 with an interval in the axial direction. The first exhaust gas aftertreatment device 15 is mounted on the mounting base 38 by screwing a bolt inserted into each bracket 16B into an upper surface 38A of the mounting base 38, which will be described later, and screwing into a screw hole 38B. It has become.

  An oxidation catalyst 17 is disposed in the cylindrical body 16 (see FIG. 11). The oxidation catalyst 17 constitutes one of the processing members for purifying the exhaust gas. The oxidation catalyst 17 is made of, for example, a ceramic cell-like cylinder, and has a large number of through holes formed in the axial direction thereof. Is coated. The oxidation catalyst 17 oxidizes and removes carbon monoxide (CO), hydrocarbons (HC), etc. contained in the exhaust gas by circulating the exhaust gas through each through hole at a predetermined temperature. It is. Further, the particulate matter (PM) is also burned and removed as necessary.

  The connection pipe 18 connects between the first exhaust gas aftertreatment device 15 and the second exhaust gas aftertreatment device 20. The connecting pipe 18 is disposed in parallel to the cylindrical body 16 below the cylindrical body 16 constituting the first exhaust gas aftertreatment device 15. A urea water injection nozzle 19 is attached to the rear end side of the connection pipe 18. The urea water injection nozzle 19 is connected to a urea water tank that stores a urea aqueous solution via a pump (both not shown). The urea water injection nozzle 19 constitutes one of the processing members that purify the exhaust gas, and injects the urea aqueous solution toward the exhaust gas flowing through the connection pipe 18.

  The second exhaust gas aftertreatment device 20 is disposed on the diagonally lower right side of the first exhaust gas aftertreatment device 15. The second exhaust gas aftertreatment device 20 is disposed on the upper side of the hydraulic pump 11 in a state where the second exhaust gas aftertreatment device 20 is attached to a right surface 38C of a mounting base 38 to be described later. The second exhaust gas aftertreatment device 20 is connected to the outlet side of the connection pipe 18 and extends in the front and rear directions in parallel with the cylinder 16 of the first exhaust gas aftertreatment device 15. 21 and a tail tube 24 projecting upward from the cylindrical body 21.

  The cylindrical body 21 is formed as a sealed container whose both ends are closed, and two brackets 21A are fixed to the outer peripheral side of the cylindrical body 21 at intervals in the axial direction. The second exhaust gas aftertreatment device 20 is configured to be attached to the mounting base 38 by screwing the bolt inserted into each bracket 21A into the screw hole 38D because it is provided on the right surface 38C of the mounting base 38 to be described later. It has become. As shown in FIG. 3, the first exhaust gas aftertreatment device 15 and the second exhaust gas aftertreatment device 20 are arranged so that a part thereof overlaps in the upward and downward directions in plan view (viewed from above). Has been.

  A selective reduction catalyst 22 and an oxidation catalyst 23 are disposed in the cylinder 21 (see FIG. 11). The selective reduction catalyst 22 is made of, for example, a ceramic cell-shaped cylinder, and has a large number of through holes formed in the axial direction thereof, and the inner surface is coated with a noble metal. This selective reduction catalyst 22 is a catalyst that selectively reduces nitrogen oxide (NOx) contained in exhaust gas discharged from the engine 9 with ammonia generated from an aqueous urea solution, and decomposes it into nitrogen and water. It is.

  Further, the oxidation catalyst 23 is formed of a ceramic cell-like cylindrical body in substantially the same manner as the oxidation catalyst 17 described above. A large number of through holes are formed in the axial direction, and the inner surface is coated with a noble metal. Thereby, the oxidation catalyst 23 oxidizes the residual ammonia remaining after reducing the nitrogen oxides by the selective reduction catalyst 22 and separates it into nitrogen and water.

  The tail tube 24 is located in a rear portion on the downstream side of the cylindrical body 21, and one end (lower end) in the length direction is inserted into the cylindrical body 21, and the other end protrudes radially upward from the cylindrical body 21. Yes. Therefore, the exhaust gas discharged from the engine 9 is guided to the exhaust gas aftertreatment device 14 by the exhaust pipe 13 and purified, and then discharged to the outside through the tail pipe 24.

  Next, in order to mount the exhaust gas aftertreatment device 14 on the revolving frame 5, the aftertreatment device mounting base 25 used in the present embodiment will be described.

  The post-processing device mounting base 25 is provided on the revolving frame 5. The aftertreatment device mounting base 25 supports the exhaust gas aftertreatment device 14. Here, the post-processing device mounting base 25 is roughly configured by four members including a frame-side front support leg 26, a frame-side rear support leg 29, an engine-side support leg 31, and a mounting base 34.

  The frame-side front support leg 26 is attached to the right front extension beam 5E3 located on the front side of the hydraulic pump 11. The frame-side front support leg 26 has sufficient strength to support the weight of the exhaust gas aftertreatment device 14. The frame-side front support leg 26 includes a lower plate 26A that contacts the upper surface of the right front extending beam 5E3, a vertical plate 26B that extends upward from the lower plate 26A, and an upper plate that is fixed to the upper end side of the vertical plate 26B. 26C.

  The lower plate 26A is formed as a polygonal plate material extending in the left and right directions. The lower plate 26A is provided with female screw holes 26D at positions corresponding to the four bolt insertion holes 5F provided in the right front extending beam 5E3. As shown in FIGS. 8 and 9, the frame-side front support leg 26 is inserted into the right front overhanging beam 5E3 by inserting the bolt 27 through the bolt insertion hole 5F of the right front overhanging beam 5E3 and screwing into the female screw hole 26D. Mounted.

  The vertical plate 26B includes a front plate 26B1 extending left and right on the front end side of the lower plate 26A, a rear plate 26B2 extending left and right on the rear end side of the lower plate 26A, and a right end and a rear plate of the front plate 26B1. It is formed in a substantially crank shape extending in the front and rear directions by an intermediate plate 26B3 connecting the left end of 26B2.

  The lower end of the vertical plate 26B is fixed to the central portion in the left and right directions of the lower plate 26A and extends upward. In this case, the height dimension of the vertical plate 26B is set larger than the height dimension of the hydraulic pump 11, and the upper plate 26C is fixed to the upper end of the vertical plate 26B. That is, the height dimension of the frame-side front support leg 26 is larger than the height dimension of the hydraulic pump 11.

  Further, a protruding plate portion 28 is provided on the upper end side of the rear plate 26B2 so as to extend upward and the upper end side protrudes from a floor plate portion 37 described later. The upper end side of the protruding plate portion 28 is curved in a concave shape. Thereby, the protrusion board part 28 is supporting the cylinder 21 of the 2nd exhaust gas aftertreatment apparatus 20 attached to the below-mentioned attachment base 38 from the lower side.

  The frame side rear support leg 29 is attached to the right rear extension beam 5E4 located on the rear side of the hydraulic pump 11. This frame side rear support leg 29 has sufficient strength to support the weight of the exhaust gas aftertreatment device 14 together with the frame side front support leg 26. The frame-side rear support leg 29 has a lower plate 29A that is in contact with the upper surface of the right rear extended beam 5E4, a vertical plate 29B that is fixed to the lower plate 29A and extends upward, and an upper end side of the vertical plate 29B. The upper plate 29C is fixed.

  The lower plate 29A is formed as a substantially rectangular plate material extending in the left and right directions. The lower plate 29A is provided with female screw holes 29D at positions corresponding to the three bolt insertion holes 5H provided in the right rear extending beam 5E4. As shown in FIGS. 8 and 9, the frame-side rear support leg 29 is inserted into the bolt insertion hole 5H of the right rear extension beam 5E4 and screwed into the female screw hole 29D. It is attached to 5E4.

  The vertical plate 29B is connected to the left plate 29B1 extending forward and rearward on the left end side of the lower plate 29A, the rear plate 29B2 connected to the rear end of the left plate 29B1 and extending rightward, and the right end of the rear plate 29B2. The right plate 29B3 extending toward the front side is formed in a substantially U-shaped cross section. The height dimension of the vertical plate 29B is set to be larger than the height dimension of the hydraulic pump 11, and the upper plate 29C is fixed to the upper end of the vertical plate 29B. That is, the height dimension of the frame side rear support leg 29 is larger than the height dimension of the hydraulic pump 11.

  The upper plate 29C is formed in a substantially L shape by an upper surface plate portion 29C1 fixed to the upper end of the vertical plate 29B and extending in the left and right directions, and a front surface plate portion 29C2 falling from the front end side of the upper surface plate portion 29C1. . The left end side of the front plate portion 29C2 is fixed to the front end side of the left plate 29B1, and the right end side of the front plate portion 29C2 is fixed to the front end side of the right plate 29B3.

  The engine-side support leg 31 is attached to the right front overhanging beam 5E3 located on the front side of the hydraulic pump 11 and attached to the right front engine support bracket 5L. The engine-side support legs 31 position the post-processing device mounting base 25 in order to reduce the mounting error between the post-processing device mounting base 25 and the engine 9 as much as possible. The engine-side support legs 31 provide strength assistance for the frame-side front support legs 26 and the frame-side rear support legs 29.

  The engine-side support leg 31 includes a lower plate 31A that contacts the upper surface of the right front extending beam 5E3, a vertical plate 31B that extends upward from the lower plate 31A, and an upper plate 31C that is fixed to the upper end side of the vertical plate 31B. It is comprised by.

  The lower plate 31A is formed as a substantially rectangular plate material extending in the left and right directions. The lower plate 31A is provided with bolt insertion holes 31D at positions corresponding to the two female screw holes 5G provided in the right front extending beam 5E3. As shown in FIGS. 8 and 9, the engine-side support leg 31 is attached to the right front extending beam 5E3 by inserting the bolt 32 into the bolt insertion hole 31D of the lower plate 31A and screwing it into the female screw hole 5G. .

  The vertical plate 31B is connected to the left plate 31B1 extending forward and rearward on the left end side of the lower plate 31A, the rear plate 31B2 connected to the rear end of the left plate 31B1 and extending toward the right side, and the right end of the rear plate 31B2. A right plate 31B3 extending toward the front side is formed in a substantially U-shaped cross section. The height dimension of the vertical plate 31B is set larger than the height dimension of the hydraulic pump 11, and the upper plate 31C is fixed to the upper end of the vertical plate 31B. That is, the height dimension of the engine side support leg 31 is larger than the height dimension of the hydraulic pump 11.

  At the lower end side of the rear plate 31B2, bolt insertion holes 31E penetrating in the front and rear directions are provided at positions corresponding to the two female screw holes 5N1 of the screw seat 5N provided in the right front engine support bracket 5L. ing. As shown in FIGS. 8 and 9, the engine-side support leg 31 is attached to the right front engine support bracket 5L by inserting a bolt 33 through the bolt insertion hole 31E and screwing it into the female screw hole 5N1.

  As described above, since the engine-side support leg 31 is attached to the right front engine support bracket 5L that directly supports the engine 9 via the vibration isolation member 10, an attachment error between the post-processing device mounting base 25 and the engine 9 is provided. Can be made as small as possible. Thereby, the attachment precision of the exhaust pipe 13 which connects between the engine 9 and the 1st exhaust gas aftertreatment apparatus 15 can be improved.

  The frame side front support leg 26 and the frame side rear support leg 29 have sufficient strength to support the exhaust gas aftertreatment device 14. Therefore, the engine side support leg 31 can be reduced in weight. Thereby, the burden on the right front engine support bracket 5L can be reduced.

  The mounting base 34 is fixed to the frame-side front support leg 26, the frame-side rear support leg 29, and the engine-side support leg 31. In order to mount the exhaust gas aftertreatment device 14 above the hydraulic pump 11, the mounting base 34 is provided so as to extend in the front and rear directions above the hydraulic pump 11. The mounting base 34 includes a front plate portion 35 that connects between the frame-side front support leg 26 and the engine-side support leg 31, and a rear plate portion 36 that is fixed to the upper plate 29 </ b> C of the frame-side rear support leg 29. The floor plate portion 37 connects the front plate portion 35 and the rear plate portion 36, and the mounting base 38 is fixed to the upper surface 37 </ b> A of the floor plate portion 37.

  The front plate portion 35 has a right end fixed to the upper plate 26C of the frame-side front support leg 26 and a left end fixed to the upper plate 31C of the engine-side support leg 31 from the front end of the lower plate 35A. It is comprised by the vertical board 35B extended toward upper direction.

  The rear plate portion 36 includes a horizontal plate 36A fixed to the front end side of the upper surface plate portion 29C1 of the upper plate 29C of the frame side rear support leg 29, and a front plate portion 29C2 of the upper plate 29C extending downward from the front end of the horizontal plate 36A. Are formed in a crank shape extending upward and downward by a front plate 36B fixed to the rear plate 36 and a rear plate 36C extending upward from the rear end of the horizontal plate 36A.

  The floor plate portion 37 has a front end fixed to the lower end side of the front plate portion 35 and a rear end fixed to the lower end side of the front plate 36 </ b> B of the rear plate portion 36. Here, since the height dimension of the frame side front support leg 26, the frame side rear support leg 29, and the engine side support leg 31 is larger than the height dimension of the hydraulic pump 11, the floor plate portion 37 is It is provided so as to cover the upper part of the hydraulic pump 11. The upper end side of the protruding plate portion 28 protrudes upward from the upper surface 37 </ b> A of the floor plate portion 37 on the front plate portion 35 side of the floor plate portion 37.

  The mounting base 38 is formed in a box shape, the lower end is fixed to the upper surface 37A on the left end side of the floor plate portion 37, the front end is fixed to the vertical plate 35B of the front plate portion 35, and the rear end is fixed to the rear plate portion 36. It is fixed to the horizontal plate 36A and the front plate 36B. On the upper surface 38A of the mounting base 38, a plurality of female screw holes 38B are provided penetrating in the upward and downward directions so as to be spaced apart in the forward and backward directions. These female screw holes 38B are for fixing the first exhaust gas aftertreatment device 15 and the connecting pipe 18 to the mounting base 38. That is, the first exhaust gas aftertreatment device 15 is attached to the mounting base 38 by screwing the bolts inserted into the bracket 16B of the first exhaust gas aftertreatment device 15 into these female screw holes 38B.

  The right surface 38C of the mounting base 38 is provided with a plurality of female screw holes 38D penetrating in the left and right directions so as to be separated in the front and rear directions. These female screw holes 38D are for fixing the second exhaust gas aftertreatment device 20 to the mounting base 38. That is, the second exhaust gas aftertreatment device 20 is attached to the mounting base 38 by screwing the bolt inserted into the bracket 21A of the second exhaust gas aftertreatment device 20 into these female screw holes 38D.

  In this case, as shown in FIG. 3, the center of gravity G of the exhaust gas aftertreatment device 14 is configured to be within the range of the mounting table 34 in plan view (viewed from above). As a result, it is possible to suppress an uneven load from being applied to the frame-side front support leg 26, the frame-side rear support leg 29, and the engine-side support leg 31. Therefore, the exhaust gas aftertreatment device 14 is stably mounted on the aftertreatment device mounting base 25.

  The frame member 39 is formed in a frame shape extending in the front and rear directions so as to straddle the second exhaust gas aftertreatment device 20, and the front end side is attached to the right end side of the vertical plate 35 </ b> B of the front plate portion 35 with a bolt. The rear end side is attached to the upper end side of the mounting bracket 40 fixed to the rear plate portion 36 by bolts. The bent member 13B of the exhaust pipe 13 and various wirings (not shown) are attached to the frame member 39.

  The hydraulic excavator 1 according to the present embodiment has the above-described configuration, and the operation thereof will be described next.

  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.

  Here, during operation of the engine 9, exhaust gas discharged from the engine 9 is introduced into the first exhaust gas aftertreatment device 15 via the exhaust pipe 13. Then, the exhaust gas passes through the connection pipe 18 and the second exhaust gas aftertreatment device 20 from the first exhaust gas aftertreatment device 15 and is discharged into the atmosphere through the tail tube 24.

  As described above, in the present embodiment, in order to sufficiently purify the exhaust gas from the engine 9, the exhaust gas aftertreatment device 14 having a large weight composed of the first and second exhaust gas aftertreatment devices 15 and 20 is provided. The post-processing device mounting base 25 is mounted on the revolving frame 5.

  By the way, in the prior art, when the post-processing device mounting base is disposed on the swivel frame, there is a possibility that an mounting error occurs between the engine and the post-processing device mounting base. In this case, when the exhaust gas aftertreatment device mounted on the aftertreatment device mounting base and the engine are connected by the exhaust pipe, there is a problem that positional displacement occurs and the accuracy of attaching the exhaust pipe is lowered. is there.

  Therefore, in the present embodiment, the engine side support legs 31 constituting the post-processing device mounting base 25 are attached to the right front extending beam 5E3 and attached to the right front engine support bracket 5L. The right front engine support bracket 5L supports the engine 9 directly (at a close position) via the vibration isolation member 10, so that there is little error with the engine 9. Accordingly, by attaching the engine-side support leg 31 of the post-processing device mounting base 25 to the right front engine support bracket 5L, a relationship can be established between the engine 9 and the post-processing device mounting base 25, and consequently the engine 9 A mounting error with the post-processing device mounting base 25 can be reduced.

  Thus, according to the present embodiment, the mounting error between the engine 9 and the exhaust gas aftertreatment device 14 can be made as small as possible. The mounting accuracy of the exhaust pipe 13 connecting the two can be improved.

  Further, since the frame side front support leg 26 and the frame side rear support leg 29 have sufficient strength to support the exhaust gas aftertreatment device 14, the engine side support leg 31 can be reduced in weight. Can do. Thereby, the burden on the right front engine support bracket 5L can be reduced.

  Further, the mounting base 34 of the post-processing device mounting base 25 is fixed to the upper end side of the frame-side front support leg 26, the frame-side rear support leg 29, and the engine-side support leg 31, thereby straddling the hydraulic pump 11. , Extends backwards. Thus, the post-processing device mounting base 25 can be disposed on the turning frame 5 without interfering with the hydraulic pump 11. The exhaust gas aftertreatment device 14 is attached to the mounting table 34. Thereby, the exhaust gas aftertreatment device 14 can be disposed in a wide space above the hydraulic pump 11.

  Further, the center of gravity G of the exhaust gas aftertreatment device 14 is within the range of the mounting table 34 in plan view. As a result, it is possible to reduce the load on the frame-side front support legs 26, the frame-side rear support legs 29, and the engine-side support legs 31, so that the exhaust gas aftertreatment device 14 can be replaced with the aftertreatment device mounting base 25. It can be mounted stably.

  In the above-described embodiment, the case where the engine side support leg 31 is attached to the right front engine support bracket 5L has been described as an example. However, the present invention is not limited to this. For example, the engine side support legs may be disposed on the frame side rear support leg side and attached to the right rear engine support bracket.

  In the above-described embodiment, the case where the first exhaust gas aftertreatment device 15 is disposed above the second exhaust gas aftertreatment device 20 has been described as an example. However, the present invention is not limited to this. For example, the first exhaust gas aftertreatment device may be disposed below the second exhaust gas aftertreatment device.

  In the above-described 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, hydraulic cranes and the like.

1 Excavator (construction machine)
2 Lower traveling body (car body)
3 Upper swing body (car body)
5 Turning frame (body frame)
5A Center frame 5A1 Bottom plate 5A2 Left vertical plate 5A3 Right vertical plate 5B Left side frame 5C Right side frame 5D1, 5D2, 5D3, 5D4, 5D5 Left extended beam 5E1, 5E2, 5E3, 5E4 Right extended beam 5J Left front engine support bracket 5K Left Rear engine support bracket 5L Right front engine support bracket 5M Right rear engine support bracket 9 Engine 10 Anti-vibration member 11 Hydraulic pump 13 Exhaust pipe 14 Exhaust gas aftertreatment device 25 Post treatment device mounting base 26 Frame side front support leg 29 Frame side rear support Leg 31 Engine side support leg 34 Mounting base

Claims (3)

A vehicle body frame that forms a support structure for the vehicle body, an engine mounted on the vehicle body frame in a horizontal direction extending left and right, and attached to the engine on one side of the left and right sides of the engine A hydraulic pump, an exhaust gas post-processing device connected to the engine via an exhaust pipe for processing exhaust gas from the engine, and a post-processing device attached to the exhaust gas post-processing device provided on the vehicle body frame With a mounting base,
The vehicle body frame has a bottom plate and left and right vertical plates erected on the bottom plate, and a center frame extending in the front and rear directions, and disposed on both the left and right sides with the center frame interposed therebetween. Left and right side frames extending in the direction, and a plurality of overhanging beams extending in the left and right directions with an interval in the front and rear directions to connect between the left and right side frames and the center frame; In a construction machine comprising a plurality of engine support brackets provided on the center frame and supporting the engine via vibration isolation members,
The post-processing device mounting base is located on a frame-side front support leg attached to a front extension beam positioned on the front side of the hydraulic pump among the extension beams, and on a rear side of the hydraulic pump among the extension beams. A frame-side rear support leg attached to the rear extension beam; an engine-side support leg attached to the front extension beam and attached to any one of the engine support brackets; and the frame-side front support leg. A construction machine comprising: the frame-side rear support leg; and a mounting base that is fixed to the engine-side support leg and on which the exhaust gas aftertreatment device is mounted. The frame-side front support leg, the frame-side rear support leg, and the engine-side support leg extend above the hydraulic pump,
The mounting base is configured to extend forward and rearward across the hydraulic pump by being fixed to an upper end side of the frame-side front support leg, the frame-side rear support leg, and the engine-side support leg. The construction machine according to claim 1.   The center of gravity of the exhaust gas post-treatment device is configured to be within the range of the mounting base in a plan view when the exhaust gas post-treatment device is mounted on the mounting base of the post-treatment device mounting base. Or the construction machine of 2.

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