JP2010247553A - Revolving type construction machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To well maintain a working environment by discharging exhaust gas at a position apart from an operator's seat. <P>SOLUTION: An exhaust pipe storage groove 16 extending in the lateral direction is formed in the upper part of a counterweight 15, and the horizontal pipe part 13A of an exhaust pipe 13 is stored in the exhaust pipe storage groove 16. The discharge port 13C of the vertical pipe part 13B of the exhaust pipe which is positioned on the other end side of the exhaust pipe 13 is opened at a position apart from the operator's seat 7. Therefore, the exhaust gas muffled and purified in an exhaust emission control device 11 can be guided to the discharge port 13C through the vertical pipe part 13B, and discharged to the outside of a hydraulic shovel 1 through the discharge port 13C apart from the operator's seat 7. Consequently, even when the exhaust emission control device 11 is disposed on the rear side of the operator's seat 7, the working environment of the operator can be well maintained since the exposure of the operator sitting on the operator's seat 7 to the exhaust noise and odor of the exhaust gas. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a swivel construction machine such as a hydraulic excavator and a hydraulic crane, and more particularly to a swivel construction machine provided with an exhaust pipe that discharges exhaust gas from an engine to the outside.

  In general, a hydraulic excavator as a typical example of a swivel construction machine includes a self-propelled lower traveling body, an upper revolving body that is pivotably mounted on the lower traveling body, and a front side of the upper revolving body. A work apparatus provided so as to be able to move up and down is generally configured, and excavation work such as earth and sand is performed using the work apparatus.

  Here, the upper swing body of the hydraulic excavator is normally a counterweight that forms a support structure and has a work frame provided on the front side, and a counterweight that balances the weight of the work device provided on the rear side of the swing frame. A driver seat disposed on the left side of the front portion of the swivel frame, an engine mounted on the swivel frame located on the front side of the counterweight, an exhaust gas treatment device provided in the engine, and the exhaust gas treatment device And an exhaust pipe for exhausting exhaust gas from the engine to the outside.

  In this case, the exhaust gas processing device performs a silencing process for reducing the exhaust sound of the exhaust gas discharged from the engine, a purification process for removing harmful substances contained in the exhaust gas, and the exhaust gas from the engine is After the muffler process, the purification process, and the like are performed in the exhaust gas processing apparatus, the exhaust gas is exhausted to the outside of the hydraulic excavator through the exhaust pipe.

  By the way, as is generally called a mini excavator, a small hydraulic excavator with a small overall machine shape (dimensions) has a small length before and behind the swivel frame, so the counterweight attached to the rear side of the swivel frame The distance between the front and the rear of the driver seat mounted on the front side is reduced. For this reason, in a small hydraulic excavator, the engine is normally disposed in a narrow space formed between the counterweight and the driver's seat in a horizontally placed state extending leftward and rightward ( Patent Document 1).

JP 2001-3727 A

  Here, an engine mounted on a hydraulic excavator is usually provided with a hydraulic pump driven by the engine and a cooling fan for supplying cooling air toward the heat exchanger, and in the vicinity of the cooling fan Are arranged adjacent to each other. Therefore, when the engine is placed horizontally as described above and extending in the left and right directions, a hydraulic pump is disposed on one side of the engine in the left and right directions, and heat exchange is performed on the other side in the left and right directions. A container is arranged.

  In this case, since the heat exchanger is larger than the hydraulic pump, a large installation space is required. In a small hydraulic excavator in which the engine is placed horizontally, the heat exchanger is sandwiched between the left side of the engine, that is, between the driver's seat and the counterweight. The hydraulic pump is arranged in the narrow space, and the heat exchanger is arranged on the right side of the engine that can secure a relatively large space. And, when a hydraulic pump is arranged on the left side of the engine, a space is formed above the hydraulic pump with a small height dimension, so that the exhaust gas exhausted from the engine is silenced above the hydraulic pump, An exhaust gas treatment device that performs a purification process or the like can be arranged.

  However, when the exhaust gas processing device is arranged above the hydraulic pump, that is, behind the driver's seat, the exhaust gas from the exhaust pipe connected to the exhaust gas processing device is discharged near the driver's seat. Become. As a result, there is a problem that the operator seated in the driver's seat is exposed to exhaust noise and exhaust gas odor, and the working environment is deteriorated.

  The present invention has been made in view of the above-described problems of the prior art, and even when an exhaust gas treatment device is arranged behind the driver's seat, the exhaust gas can be discharged at a position away from the driver's seat, and the working environment The object is to provide a construction machine that can maintain a good condition.

  In order to solve the above-described problems, the present invention includes a self-propelled lower traveling body, an upper revolving body that is turnably mounted on the lower traveling body, and a work device provided on the upper revolving body. The upper revolving structure includes a revolving frame in which a supporting structure is formed and the working device is provided on the front side, a counterweight is provided on the rear side of the revolving frame and balances the weight of the working device, and the turning A driver's seat disposed on the revolving frame on the front side of the frame and shifted to the left in the left and right directions, and located between the driver's seat and the counterweight, left and right on the revolving frame Mounted in a horizontally extending state extending in a direction, a hydraulic pump is provided on the left side and a heat exchanger is arranged on the right side, and positioned behind the driver's seat and above the hydraulic pump. Before being established The present invention is applied to a swivel construction machine including an exhaust gas processing device that processes exhaust gas discharged from an engine, and an exhaust pipe that is connected to the exhaust gas processing device and exhausts exhaust gas from the engine to the outside. .

  The first aspect of the present invention is characterized in that the exhaust pipe has one end connected to the exhaust gas treatment device and the other end connected to the heat exchange in order to separate the exhaust port of the exhaust pipe from the driver's seat. The upper part of the counterweight is configured to extend leftward and rightward, and an exhaust pipe receiving groove extending leftward and rightward is provided on the upper side of the counterweight to accommodate the exhaust pipe. is there.

  According to a second aspect of the present invention, the counterweight is provided with an exhaust pipe lead-out portion for leading the other end side of the exhaust pipe from the exhaust pipe housing groove to above the counterweight.

  According to a third aspect of the present invention, the counterweight includes a base portion attached to the revolving frame, a peripheral wall portion that rises upward from the base portion and curves in a circular arc shape and extends in the left and right directions, and an upper end of the peripheral wall portion An upper thick part extending leftward and rightward with a larger wall thickness than the peripheral wall part, and a flange part protruding forward from the upper end side of the upper thick part and covering the rear side of the engine from above The exhaust pipe receiving groove is formed as an inverted L-shaped space formed on the lower side of the flange portion and on the front side of the upper thick portion.

  According to a fourth aspect of the present invention, the counterweight is provided with a maintenance port that is located below the exhaust pipe housing groove and opens forward and rearward to perform maintenance work of the engine. It is in.

  According to a fifth aspect of the present invention, a discharge pipe that discharges exhaust gas from the engine is integrally provided in the exhaust gas processing device, and the discharge pipe of the exhaust gas processing device is provided from an outer peripheral side at one end side of the exhaust pipe. It is in the structure which provided the flare part expanded in the cone shape which covers.

  According to the first aspect of the present invention, the other end of the exhaust pipe connected at one end to the exhaust gas treatment device is in the left and right direction toward the heat exchanger while being accommodated in the exhaust pipe accommodating groove of the counterweight. Therefore, the other end side of the exhaust pipe can be arranged at a position away from the driver's seat. Therefore, even when the exhaust gas treatment device is disposed behind the driver's seat, the operator can exhaust the exhaust gas and exhaust gas odor by discharging the exhaust gas from the other end of the exhaust pipe disposed at a location away from the driver's seat. Exposure can be suppressed, and the working environment of the operator can be kept good.

  Moreover, because the exhaust pipe storage groove is provided on the upper side of the counterweight, the counterweight exhaust pipe can be stored even in a small swivel construction machine that can ensure only a narrow space between the driver's seat and the counterweight. By accommodating the exhaust pipe in the groove, the other end of the exhaust pipe can be extended to the left and right, and the exhaust gas can be discharged at a position away from the driver's seat.

  According to the invention of claim 2, the other end side of the exhaust pipe accommodated in the exhaust pipe accommodation groove can be led out above the counterweight through the exhaust pipe lead-out portion of the counterweight. As a result, the exhaust gas can be discharged above the counterweight, so that the exhaust gas is prevented from being discharged toward the worker around the hydraulic excavator and the working environment around the hydraulic excavator is also good. Can be kept in.

  According to the invention of claim 3, by utilizing the inverted L-shaped space formed on the lower side of the collar portion constituting the counterweight and on the front side of the upper thick portion as the exhaust pipe accommodating groove, It is not necessary to newly form an exhaust pipe accommodation groove in the counterweight, and the configuration of the counterweight provided with the exhaust pipe accommodation groove can be simplified.

  According to the fourth aspect of the present invention, since the exhaust pipe accommodation groove is disposed above the maintenance port of the counterweight, the exhaust pipe that becomes high temperature due to the circulation of the exhaust gas is accommodated in the exhaust pipe at a position away from the maintenance port. It can be accommodated in the groove. As a result, an operator who performs maintenance on the engine or the like through the maintenance port can be prevented from inadvertently coming into contact with the exhaust pipe that has become hot, and the workability of the maintenance work can be improved.

  According to the invention of claim 5, a gap is formed between the discharge pipe and the flare part by covering the discharge pipe of the exhaust gas treatment device from the outer peripheral side by the flare part provided on one end side of the exhaust pipe. The Thereby, it is possible to prevent the vibration generated by the exhaust gas treatment device from being transmitted from the discharge pipe to the exhaust pipe. Further, by using the flow when the exhaust gas discharged from the discharge pipe is introduced into the exhaust pipe, the temperature rise of the exhaust pipe can be suppressed by sucking the outside air around the flare portion into the exhaust pipe.

1 is a front view showing a hydraulic excavator to which an embodiment of the present invention is applied. It is the top view which looked at the hydraulic excavator from the upper part. It is the rear view which looked at the hydraulic excavator from the counterweight side. FIG. 4 is a rear view similar to FIG. 3 showing a state where the engine cover is opened. It is a top view which shows the state which mounted the counterweight and the engine on the turning frame. It is the front view which looked at the turning frame, the exhaust pipe accommodating groove of the counterweight, the engine, the exhaust gas processing device, the exhaust pipe, etc. from the arrow VI-VI direction in FIG. FIG. 7 is a partially broken rear view of a turning frame, an engine, an exhaust gas processing device, an exhaust pipe, and the like when viewed from the direction of arrows VII-VII in FIG. 6. It is the rear view which looked at the counterweight from the rear side. It is the front view which looked at the counterweight from the arrow IX-IX direction in FIG. It is the top view which looked at the counterweight from the arrow XX direction in FIG. It is the left view which looked at the counterweight from the arrow XI-XI direction in FIG. It is a perspective view which shows a counterweight alone.

  Hereinafter, an embodiment of a swivel construction machine according to the present invention will be described in detail with reference to the accompanying drawings, taking as an example a case where the present invention is applied to a cab type small hydraulic excavator.

  In the figure, reference numeral 1 denotes a small hydraulic excavator as a typical example of a construction machine. The hydraulic excavator 1 includes a self-propelled crawler type lower traveling body 2 having left and right crawlers (tracks) 2A, and The upper swing body 3 that is turnably mounted on the lower traveling body 2 and a swing type work device 4 provided on the front side of the upper swing body 3 are roughly configured, and the work device 4 excavates earth and sand. The work is performed. The hydraulic excavator 1 shown in FIG. 1 has a body weight of, for example, about 3 to 7 tons and is usually called a mini excavator.

  Here, as shown in FIG. 2, the upper-part turning body 3 has a width dimension in the left and right directions substantially equal to the vehicle width of the lower traveling body 2 (interval between the left and right crawlers 2A). It is formed in a substantially circular shape. As a result, the excavator 1 is a small rear turning type in which the rear surface of the counterweight 15 described later is substantially within the vehicle width of the lower traveling body 2 when the upper revolving body 3 performs the turning operation on the lower traveling body 2. It is configured as a hydraulic excavator.

  The upper swing body 3 includes a swing frame 5, a cab 6, a driver's seat 7, an engine 8, an exhaust gas processing device 11, an exhaust pipe 13, a counterweight 15 and the like which will be described later.

  Reference numeral 5 denotes a revolving frame that serves as a base of the upper revolving structure 3. As shown in FIG. 5, the revolving frame 5 includes a thick flat plate-like bottom plate 5A that extends forward and rearward in the center in the left and right directions. The left and right vertical plates 5B and 5C standing on the upper surface side of the bottom plate 5A and extending in the front and rear directions, and the support bracket 5D provided at the front ends of the left and right vertical plates 5B and 5C, The arc-shaped left frame member 5E provided on the left side of the bottom plate 5A and the arc-shaped right frame member 5F provided on the right side of the bottom plate 5A are roughly configured to form a strong support structure.

  The working device 4 is attached to the support bracket 5D positioned on the front end side of the revolving frame 5, and a counter, which will be described later, balances the weight with the working device 4 on the rear end side of the bottom plate 5A constituting the revolving frame 5. The weight 15 is configured to be attached.

  Reference numeral 6 denotes a cab as a building disposed on the left side of the front part of the revolving frame 5, and the cab 6 defines a cab. A driver's seat 7 on which an operator who operates the excavator 1 is seated is disposed in the cab 6. In the cab 6, operating devices (not shown) such as a traveling lever / pedal, an operating lever and the like operated by an operator seated in the driver's seat 7 are arranged.

  Reference numeral 8 denotes an engine mounted on the turning frame 5 between the cab 6 (driver's seat 7) and a counterweight 15 to be described later. The engine 8 is arranged in a horizontally extending state extending in the left and right directions. ing. A hydraulic pump 9 is disposed on the left side of the engine 8, and the hydraulic pump 9 is driven by the engine 8 to supply operating hydraulic oil to various hydraulic actuators mounted on the hydraulic excavator 1. To do. On the other hand, a heat exchanger 10 such as a radiator or an oil cooler is disposed on the right side of the engine 8, and the heat exchanger 10 receives engine cooling water and hydraulic oil by cooling air sucked by a cooling fan 8 </ b> A of the engine 8. Etc. to cool the fluid.

  Next, reference numeral 11 denotes an exhaust gas processing device provided in the engine 8 that is located behind the cab 6 (driver's seat 7) and above the hydraulic pump 9. This exhaust gas treatment device 11 is a silence process for reducing the exhaust sound of the exhaust gas discharged from the engine 8, a purification process for removing harmful substances such as particulate matter and nitrogen oxides (NOx) contained in the exhaust gas, etc. Is to do.

  Here, as shown in FIGS. 5 and 6, the exhaust gas treatment device 11 is formed as a cylindrical body whose both ends in the axial direction (length direction) are closed, and a plurality of sound deadening walls and purification are formed in the inside thereof. A device (both not shown) and the like are provided. The exhaust gas processing device 11 is supported on the upper side of the hydraulic pump 9 by a bracket 12 fixed to the engine 8 with the axial direction aligned with the front and rear directions.

  The exhaust gas treatment device 11 is connected to the exhaust side of the engine 8 via the exhaust introduction pipe 11A, and reduces the exhaust noise of the exhaust gas discharged from the engine 8, for example, by a silencing wall or the like, and exhausts it by the purification device. It removes harmful substances in the gas. In addition, a discharge pipe 11B that discharges exhaust gas that has been subjected to a muffling process and a purification process is integrally provided on the rear side of the exhaust gas processing device 11, and an exhaust pipe that will be described later is disposed on the distal end side of the discharge pipe 11B. 13 is connected.

  Reference numeral 13 denotes an exhaust pipe connected to the exhaust gas processing device 11. The exhaust pipe 13 discharges the exhaust gas that has been silenced and purified by the exhaust gas processing device 11 to the outside of the excavator 1. Here, as shown in FIGS. 6 and 7, the exhaust pipe 13 is formed as a pipe body bent in an L shape as a whole, and has a horizontal pipe portion 13A extending linearly in the horizontal direction, and the horizontal pipe portion 13A. And a vertical pipe portion 13B that is bent upward and extends in the vertical direction.

  As shown in FIG. 7, the exhaust pipe 13 is supported by the engine 8 through the bracket 14 with the horizontal pipe portion 13A, so that one end side (left end side) in the left and right directions of the horizontal pipe portion 13A In a state where it is connected to the discharge pipe 11B of the exhaust gas processing device 11, the other end side (right end side) is arranged to extend left and right on the engine 8 toward the heat exchanger 10. In this case, the horizontal pipe portion 13A of the exhaust pipe 13 is housed in an exhaust pipe housing groove 16 of the counterweight 15 described later, and the front end side (upper end side) of the vertical pipe portion 13B faces upward from the upper surface of the counterweight 15. The exhaust port 13C protrudes and exhausts exhaust gas backward from the counterweight 15.

  Therefore, the exhaust gas discharged from the engine 8 is silenced and purified in the exhaust gas processing device 11 and then introduced into the exhaust pipe 13 from the discharge pipe 11B of the exhaust gas processing device 11. Then, the exhaust gas flows to the discharge port 13C through the horizontal pipe portion 13A and the vertical pipe portion 13B of the exhaust pipe 13, and is discharged to the outside of the hydraulic excavator 1 from the discharge port 13C. As a result, even when the exhaust gas processing device 11 is disposed behind the driver's seat 7, the exhaust gas that has been subjected to the silencing process in the exhaust gas processing device 11 is separated from the driver's seat 7 by the exhaust pipe 13. It becomes the composition which can discharge.

  On the other hand, a flare portion 13D whose diameter increases conically toward the exhaust gas processing device 11 is provided on one end side of the exhaust pipe 13 (horizontal tube portion 13A) on the exhaust gas processing device 11 side. Covers the tip of the discharge pipe 11B of the exhaust gas treatment device 11 from the outer peripheral side. As a result, a gap is formed between the distal end portion of the discharge pipe 11B and the flare portion 13D of the exhaust pipe 13, and vibration generated by the exhaust gas processing device 11 is transmitted to the exhaust pipe 13 via the discharge pipe 11B. It is the structure which can prevent. Further, by using the flow when the exhaust gas discharged from the discharge pipe 11B is introduced into the exhaust pipe 13, the temperature of the exhaust pipe 13 is increased by sucking the outside air around the flare portion 13D into the exhaust pipe 13. It is the structure which can suppress.

  Next, reference numeral 15 denotes a counterweight used in this embodiment. The counterweight 15 is made of a heavy object that is integrally formed using, for example, a casting means, and is attached to the rear end portion of the revolving frame 5 to balance the weight with the work device 4.

  Here, as shown in FIGS. 8 to 12, the counterweight 15 has a thick base portion 15A attached to the rear end portion of the swivel frame 5, and rises upward from the base portion 15A, and is curved in an arc shape. A peripheral wall portion 15B extending in the left and right directions, and a thick upper thick portion 15C extending in the left and right directions while facing the base portion 15A on the upper end side of the peripheral wall portion 15B. The upper thick portion 15C is roughly constituted by a thin flat plate-like flange portion 15D protruding forward from the upper end portion, and the lower side of the flange portion 15D is an exhaust pipe accommodating groove 16 described later.

  In this case, the peripheral wall portion 15B of the counterweight 15 rises upward from the rear end portion of the turning frame 5 to cover the engine 8, the hydraulic pump 9, the heat exchanger 10 and the like from the rear side. In addition, a rectangular maintenance port 15E is provided in the middle of the left and right sides of the peripheral wall portion 15B between the base portion 15A and the upper thick portion 15C so as to open in the front and rear directions. Yes. The maintenance port 15E is opened and closed by an engine cover 19 which will be described later, and the operator can perform maintenance work on the engine 8 and the like from the rear of the counterweight 15 through the maintenance port 15E. On the other hand, the flange portion 15D of the counterweight 15 constitutes the upper surface of the counterweight 15 and covers the rear side of the engine 8, the heat exchanger 10, the exhaust pipe 13, and the like from above (see FIG. 5).

  Reference numeral 16 denotes an exhaust pipe accommodation groove provided on the upper side of the counterweight 15. The exhaust pipe accommodation groove 16 accommodates the horizontal pipe portion 13 </ b> A of the exhaust pipe 13 described above. Here, the exhaust pipe accommodating groove 16 is formed using an inverted L-shaped space formed on the lower side of the flange portion 15D constituting the counterweight 15 and on the front side of the upper thick portion 15C. The upper side of 15E extends leftward and rightward.

  Thus, by forming the exhaust pipe accommodating groove 16 below the flange portion 15D of the counterweight 15 and on the front side of the upper thick portion 15C, there is only a narrow space between the counterweight 15 and the driver's seat 7. Even if it cannot be ensured, the other end side of the exhaust pipe 13 extends leftward and rightward through the exhaust pipe accommodating groove 16 and can be arranged at a position away from the driver's seat 7. Further, by forming the exhaust pipe accommodating groove 16 above the maintenance port 15E provided in the counterweight 15, the exhaust pipe accommodating groove 16 that becomes high temperature due to the circulation of the exhaust gas is disposed at a position away from the maintenance port 15E. 16 is configured to be housed in the interior.

  Reference numeral 17 denotes an exhaust pipe lead-out portion provided on the flange portion 15D of the counterweight 15. The exhaust pipe lead-out portion 17 leads the other end side of the exhaust pipe 13 from the exhaust pipe accommodating groove 16 to above the counterweight 15. It is. Here, the exhaust pipe lead-out part 17 is formed by cutting out the front end edge of the flange part 15D in a substantially semicircular shape, and the vertical pipe part 13B of the exhaust pipe 13 is inserted upward and downward. Yes.

  Therefore, as shown in FIG. 7, the exhaust pipe 13 is connected to the discharge pipe 11 </ b> B of the exhaust gas processing device 11 by the horizontal pipe portion 13 </ b> A being supported by the engine 8 via the bracket 14. Thus, it is housed in the exhaust pipe housing groove 16 as shown in FIG. The vertical pipe portion 13B of the exhaust pipe 13 projects from the exhaust pipe housing groove 16 through the exhaust pipe lead-out portion 17 to the upper side of the counterweight 15, and the discharge port 13C on the front end side of the vertical pipe portion 13B is located behind the counterweight 15. It is the structure which opens toward.

  An exterior cover 18 is provided on the revolving frame 5 continuously to the counterweight 15. The exterior cover 18 covers the mounted equipment such as the engine 8, the hydraulic pump 9, and the heat exchanger 10 together with the counterweight 15. is there. In this case, the upper surface of the outer cover 18 forms the same plane as the upper surface of the flange portion 15D of the counterweight 15, and the rear end edge of the outer cover 18 has a portion corresponding to the exhaust pipe lead-out portion 17 of the flange portion 15D. Similarly to the exhaust pipe lead-out part 17, a semicircular cutout part 18A through which the vertical pipe part 13B of the exhaust pipe 13 is inserted is formed (see FIG. 2).

  Reference numeral 19 denotes an engine cover attached to the counterweight 15. The engine cover 19 opens and closes a maintenance port 15E provided in the peripheral wall portion 15B of the counterweight 15. Here, the engine cover 19 is formed of a plate body that extends in the left and right directions while being curved in an arc shape, and is attached to the counterweight 15 via a link mechanism (not shown).

  The engine cover 19 is moved upward and downward between a closed position where the maintenance port 15E is closed as shown in FIG. 3 and an open position where the maintenance port 15E is opened as shown in FIG. Then, by moving the engine cover 19 to the open position, the maintenance work of the engine 8 and the like can be performed from behind the counterweight 15 through the maintenance port 15E of the counterweight 15.

  The hydraulic excavator 1 according to the present embodiment has the above-described configuration. When performing excavation work or the like using the hydraulic excavator 1, first, the hydraulic pump 9 is driven by operating the engine 8.

  In this state, an operator seated in the driver's seat 7 operates a traveling lever / pedal (not shown) disposed in the cab 6 to cause the lower traveling body 2 to self-propel and cause the hydraulic excavator 1 to work. To move. Then, after the excavator 1 moves to the work site, the operator can perform excavation work such as earth and sand by the work device 4 while turning the upper swing body 3 by operating an operation lever (not shown). it can.

  Here, exhaust gas generated during operation of the engine 8 is introduced into the exhaust gas processing device 11 through the exhaust introduction pipe 11A, and after being silenced and purified in the exhaust gas processing device 11, the exhaust gas processing device 11 is used. From the discharge pipe 11B to the exhaust pipe 13.

  In this case, a flare portion 13D that covers the distal end portion of the discharge pipe 11B from the outer peripheral side is provided on one end side of the exhaust pipe 13. As a result, a gap is formed between the distal end portion of the discharge pipe 11B and the flare portion 13D of the exhaust pipe 13, and vibration generated by the exhaust gas processing device 11 is transmitted to the exhaust pipe 13 via the discharge pipe 11B. Can be prevented. Further, by utilizing the flow when the exhaust gas discharged from the discharge pipe 11B is introduced into the exhaust pipe 13, the outside air around the flare portion 13D is sucked into the exhaust pipe 13 and heated by the exhaust gas. The temperature rise of the exhaust pipe 13 can be suppressed.

  The exhaust gas introduced into the exhaust pipe 13 flows to the vertical pipe part 13B through the horizontal pipe part 13A of the exhaust pipe 13, and the upper surface of the counterweight 15 through the discharge port 13C on the tip side of the vertical pipe part 13B. It is discharged toward the rear.

  Thus, even in a small hydraulic excavator 1 in which the distance between the driver's seat 7 and the counterweight 15 is narrow, the exhaust pipe 13 is accommodated in the exhaust pipe accommodating groove 16 provided in the counterweight 15, thereby The narrow space between the counterweight 15 and the counterweight 15 can be used effectively to guide the other end of the exhaust pipe 13 to a position away from the driver's seat 7. As a result, since the exhaust gas from the engine 8 can be discharged to the outside at a position away from the driver's seat 7 (cab 6), the operator seated in the driver's seat 7 can detect the exhaust sound of exhaust gas, the exhaust gas odor. The operator's work environment can be kept good.

  Thus, according to the present embodiment, in the small excavator 1 in which the front and rear distances between the driver's seat 7 and the counterweight 15 are set small, the exhaust gas processing device 11 is provided on the rear side of the driver's seat 7. Even in the case of the arrangement, the exhaust pipe accommodating groove 16 extending in the left and right directions is provided on the upper side of the counterweight 15, and the horizontal pipe portion 13 </ b> A of the exhaust pipe 13 is accommodated in the exhaust pipe accommodating groove 16. 13 is connected to the discharge pipe 11B of the exhaust gas treatment device 11, and the discharge port 13C of the vertical pipe portion 13B located on the other end side of the exhaust pipe 13 is opened at a position separated from the driver's seat 7. it can.

  As a result, the exhaust gas discharged from the engine 8 is silenced and purified in the exhaust gas processing device 11, and then discharged from the exhaust gas processing device 11 through the horizontal pipe portion 13A and the vertical pipe portion 13B of the exhaust pipe 13. 13C and can be discharged to the outside of the excavator 1 through the discharge port 13C away from the driver's seat 7. Therefore, the operator seated in the driver's seat 7 can be prevented from being exposed to the exhaust gas exhaust noise and the exhaust gas odor, and the operator's working environment can be kept good.

  Further, by providing the exhaust pipe lead-out portion 17 in the flange portion 15 </ b> D of the counterweight 15, the vertical pipe portion 13 </ b> B of the exhaust pipe 13 can be led out above the counterweight 15 through the exhaust pipe lead-out portion 17. As a result, exhaust gas can be discharged above the counterweight 15 through the discharge port 13C on the distal end side of the vertical pipe portion 13B, so that the exhaust gas is discharged toward the worker around the excavator 1. Even if it is a small hydraulic excavator 1, the surrounding work environment can be kept favorable.

  Further, since the exhaust pipe accommodating groove 16 is formed using an inverted L-shaped space formed on the lower side of the flange portion 15D constituting the counterweight 15 and on the front side of the upper thick portion 15C, It is not necessary to newly form only the exhaust pipe housing groove in the counterweight 15. As a result, the structure of the counterweight 15 provided with the exhaust pipe accommodating groove 16 can be simplified, and the manufacturing cost of the counterweight 15 can be reduced.

  Moreover, since the exhaust pipe accommodating groove 16 is disposed above the maintenance port 15E formed in the counterweight 15, the exhaust pipe 13 that becomes high temperature due to the circulation of the exhaust gas is disposed at a position away from the maintenance port 15E. It can be accommodated in the accommodation groove 16. As a result, when maintenance work is performed on the engine 8 or the like through the maintenance port 15E with the engine cover 19 in the open position as shown in FIG. 4, the operator inadvertently contacts the exhaust pipe 13 that has become hot. Can be suppressed, and the workability of the maintenance work can be improved.

  Further, a flare portion 13D that expands in a conical shape is provided on one end side of the exhaust pipe 13 connected to the discharge pipe 11B of the exhaust gas processing device 11, and the discharge pipe 11B is covered from the outer peripheral side by the flare portion 13D. A gap can be formed between the discharge pipe 11B and the flare portion 13D. Thereby, it is possible to prevent the vibration generated by the exhaust gas processing device 11 from being transmitted from the discharge pipe 11B to the exhaust pipe 13. Further, by utilizing the flow when the exhaust gas discharged from the discharge pipe 11B is introduced into the exhaust pipe 13, the outside air around the flare portion 13D can be sucked into the exhaust pipe 13 and heated by the exhaust gas. The temperature rise of the exhaust pipe 13 can be suppressed.

  In the embodiment described above, the excavator 1 in which the cab 6 is disposed on the front left side of the revolving frame 5 and the driver's seat 7 is disposed in the cab 6 is described as an example. However, the present invention is not limited to this, and may be applied to, for example, a hydraulic excavator provided with a canopy that covers the driver's seat from above instead of the cab 6.

  Moreover, in embodiment mentioned above, the hydraulic shovel 1 is illustrated as a turning type construction machine. However, the present invention is not limited to this, and can be widely applied to other swivel construction machines such as a hydraulic crane.

1 Hydraulic excavator (swivel construction machine)
DESCRIPTION OF SYMBOLS 2 Lower traveling body 3 Upper turning body 5 Turning frame 6 Cab 7 Driver's seat 8 Engine 9 Hydraulic pump 10 Heat exchanger 11 Exhaust gas treatment device 11B Discharge pipe 13 Exhaust pipe 13D Flare part 15 Counterweight 15A Base part 15B Perimeter wall part 15C Top Thick part 15D Fence part 15E Maintenance port 16 Exhaust pipe receiving groove 17 Exhaust pipe lead-out part

Claims (5)

A self-propelled lower traveling body, an upper revolving body mounted on the lower traveling body so as to be able to swivel, and a work device provided on the upper revolving body,
The upper swing body includes a swing frame that forms a support structure and the working device is provided on the front side, a counterweight that is provided on the rear side of the swing frame and balances the weight of the work device, and the swing frame A driver's seat disposed on the swivel frame, shifted to the left in the left and right directions, and positioned between the driver's seat and the counterweight in the left and right directions Mounted on the left side and a hydraulic pump on the left side and a heat exchanger on the right side, and installed on the engine behind the driver seat and above the hydraulic pump. And an exhaust gas processing device for processing exhaust gas exhausted from the engine, and an exhaust pipe connected to the exhaust gas processing device and exhausting exhaust gas from the engine to the outside. In times construction equipment,
In order to separate the exhaust port of the exhaust pipe from the driver's seat, the exhaust pipe has one end connected to the exhaust gas processing device and the other end extending leftward and rightward above the engine toward the heat exchanger. With configuration,
A swivel construction machine characterized in that an exhaust pipe receiving groove extending in the left and right directions is provided on the upper side of the counterweight in order to receive the exhaust pipe.   2. The swivel construction machine according to claim 1, wherein the counterweight is provided with an exhaust pipe lead-out portion that leads the other end side of the exhaust pipe from the exhaust pipe housing groove to above the counterweight. The counterweight is disposed on the upper end side of the peripheral wall portion, the base portion attached to the swivel frame, the peripheral wall portion rising upward from the base portion and curving in a circular arc shape and extending in the left and right directions. An upper thick portion extending leftward and rightward with a greater wall thickness, and a flange that extends forward from the upper end side of the upper thick portion and covers the rear side of the engine from above,
3. The swivel construction machine according to claim 1, wherein the exhaust pipe housing groove is an inverted L-shaped space formed below the flange and on the front side of the upper thick part.   4. The counterweight according to claim 1, 2, or 3, wherein the counterweight is provided with a maintenance port that is positioned below the exhaust pipe housing groove and opens forward and rearward to perform maintenance work of the engine. The described swivel construction machine. The exhaust gas processing device is integrally provided with a discharge pipe for discharging exhaust gas from the engine,
5. The swivel construction machine according to claim 1, 2, 3, or 4, wherein a flare portion having a conical diameter that covers a discharge pipe of the exhaust gas processing device from an outer peripheral side is provided on one end side of the exhaust pipe. .

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