JP5442672B2 - Construction machinery - Google Patents

Description

  The present invention relates to a construction machine such as a hydraulic excavator and a hydraulic crane, and more particularly to a construction machine provided with an exhaust gas purification device that purifies exhaust gas from an engine.

  In general, a hydraulic excavator as a typical example of a construction machine is a self-propelled lower traveling body, an upper revolving body that is turnably mounted on the lower traveling body, and an uplifting motion on the front side of the upper revolving body. It is roughly constituted by a work device provided so as to perform excavation work such as earth and sand using the work device.

  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's seat disposed on the left side of the front portion of the turning frame, an engine mounted on the turning frame located on the front side of the counterweight, and exhaust gas provided in connection with the engine and exhausted from the engine And an exhaust gas purifying device for purifying exhaust gas exhausted from the engine located in the middle of the exhaust pipe (see, for example, Patent Document 1) .

  In this case, the exhaust gas purification device performs a purification process for removing harmful substances contained in the exhaust gas, a silencing process for reducing the exhaust noise of the exhaust gas, and the exhaust gas from the engine is sent by the exhaust gas purification device. After the purification process, the muffling process, etc., the exhaust pipe is discharged to the outside of the hydraulic excavator.

  By the way, the exhaust gas purification device is provided in the casing, for example, a casing that forms an outer shell, an oxidation catalyst provided in the casing, and a downstream side of the oxidation catalyst in the flow direction of the exhaust gas. The PM collecting filter and a silencer provided in the casing are roughly configured.

  Here, the oxidation catalyst is for oxidizing and removing nitrogen monoxide (NO), carbon monoxide (CO), hydrocarbon (HC) and the like contained in the exhaust gas. The PM collection filter (DPF: Diesel Particulate Filter) collects particulate matter (PM) contained in exhaust gas and burns and removes the collected particulate matter. The silencer reduces the exhaust volume.

  The exhaust gas purification apparatus is provided with, for example, a temperature sensor that detects the temperature of the exhaust gas, a pressure sensor that detects the pressure of the exhaust gas, and the like. In the prior art according to Patent Document 1, a support member is provided in the casing of the exhaust gas purification device, and the support member and the pressure sensor are concentrated and supported by the support member.

  In addition, a small hydraulic excavator that is suitably used for excavation work in a narrow work site such as an urban area, for example, has a counterweight placed close to the turning center in order to keep the turning radius of the upper turning body small, and the upper turning The body is made as compact as possible (the rear end side is shortened).

  In this case, for example, on the rear side of the turning frame, a support frame (support member) whose upper end side is a driver seat support portion (pedestal) is arranged so as to straddle the engine, and the driver seat support portion of the support frame has a The rear side of the floor member provided with the driver's seat is supported (see, for example, Patent Document 2).

  By the way, 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 to the heat exchanger, and there is a heat exchanger in the vicinity of the cooling fan. Adjacent to each other. Therefore, for example, when the engine is placed in a horizontal state extending in the left and right directions, a hydraulic pump is provided on one side of the engine in the left and right directions, and a heat exchanger is provided on the other side in the left and right directions. It will be 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 left side of the engine, that is, the driver's seat and the counterweight, The hydraulic pump is arranged in a narrow space between the two, and the heat exchanger is arranged on the right side of the engine that can secure a relatively large space.

  When a hydraulic pump is arranged on the left side of the engine, a space is formed above the hydraulic pump having a small height, so that the exhaust gas exhausted from the engine is purified above the hydraulic pump. It is possible to arrange an exhaust gas purification device that performs the above.

JP 2010-43574 A JP 2007-56627 A

  By the way, in a general hydraulic excavator, a device accommodating chamber (engine room) for accommodating an engine or the like can be formed in a sufficiently large area on the rear side of the revolving frame. For this reason, when performing maintenance of the exhaust gas purification device arranged in the equipment storage chamber, specifically, for example, when performing repair, inspection, replacement, etc. of the temperature sensor connector or pressure sensor, the equipment storage chamber is formed. The upper cover is opened, and work such as repair, inspection, and replacement of the temperature sensor connector and the pressure sensor can be performed from the upper side of the device housing chamber.

  On the other hand, in the small hydraulic excavator, the rear side of the floor member provided with the driver's seat is supported on the upper end side (driver's seat support portion) of the support frame arranged so as to straddle the engine. For this reason, when performing maintenance on the exhaust gas purification device, for example, when repairing, checking, or replacing a temperature sensor connector or pressure sensor, the floor member is tilted upward with the front side of the floor member as a fulcrum. (Tilt up) is required.

  Thus, every time maintenance work of the exhaust gas purification device is performed, it is troublesome to tilt up the floor member, and there is a problem that repair, inspection, replacement, etc. of the exhaust gas purification device cannot be easily performed. .

  The present invention has been made in view of the above-described problems of the prior art, and an object thereof is to provide a construction machine that can easily perform maintenance work of an exhaust gas purification device.

  A construction machine according to 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, and the upper revolving body The body has a swivel frame provided with the working device on the front side, a counterweight provided on the rear side of the swivel frame to balance the weight of the work device, and the swivel located on the front side of the counterweight. An engine that is mounted horizontally on the frame and extends in the left and right direction, and has a hydraulic pump on one side and a heat exchanger on the other side, and is connected to the engine and discharged from the engine. An exhaust pipe that exhausts exhaust gas to the outside, a support frame in which a leg portion supported by the revolving frame straddles the engine and an upper end side is a driver seat support portion, and the air A floor member located on the swivel frame located on the front side of the gin and supported on the driver seat support portion of the support frame on the rear side; and the counter located on one side of the upper swivel body in the left and right directions A side cover is provided between the weight and the floor member and is opened and closed when maintaining the internal equipment including the engine.

  In order to solve the above-described problem, the feature of the configuration of the invention of claim 1 is that the feature is located in the middle of the exhaust pipe between the driver seat support portion of the support frame and the hydraulic pump. An exhaust gas purification device for purifying exhaust gas discharged from the engine is provided, and the exhaust gas purification device is provided with a bracket for attaching sensors, and the bracket is purified by the exhaust gas purification device. A temperature sensor connector for detecting the temperature of the exhaust gas and a pressure sensor for detecting the pressure of the exhaust gas, the connector of the temperature sensor and the pressure sensor when the side cover is opened, the support frame It can be installed and removed from the inside of the driver's seat support.

  The invention of claim 2 is that the connector of the temperature sensor and the pressure sensor are attached to an upper position of the exhaust gas purification device via the bracket.

  The invention of claim 3 is that the connector of the temperature sensor and the pressure sensor are attached to a lower position of the exhaust gas purification device via the bracket.

  According to a fourth aspect of the present invention, the connector of the temperature sensor and the pressure sensor are attached to the exhaust gas purification device via separate brackets.

  According to the first aspect of the present invention, the temperature sensor connector and the pressure sensor can be attached and removed from the inside of the driver seat support portion of the support frame when the side cover is opened. Without tilting up, the temperature sensor connector and pressure sensor can be repaired, inspected, and exchanged. For this reason, the maintenance work of the exhaust gas purification device can be easily performed.

  According to the second aspect of the present invention, since the temperature sensor connector and the pressure sensor are attached to the upper position of the exhaust gas purification apparatus via the bracket, the temperature sensor connector and the pressure sensor are installed from the upper position of the exhaust gas purification apparatus. Can be easily installed and removed. Thereby, the maintenance work of the exhaust gas purification device can be easily performed.

  According to the third aspect of the present invention, the temperature sensor connector and the pressure sensor are attached to the lower position of the exhaust gas purifying device via the bracket. Can be easily installed and removed. Thereby, the maintenance work of the exhaust gas purification device can be easily performed.

  According to the fourth aspect of the present invention, the temperature sensor connector and the pressure sensor are attached to the exhaust gas purifying device via separate brackets, so the degree of freedom of the temperature sensor connector and the pressure sensor attachment position is increased. be able to. Thereby, the connector and pressure sensor of a temperature sensor can be arrange | positioned in the position which can be attached and removed more easily.

1 is a front view showing a small hydraulic excavator according to a first embodiment of the present invention. It is a front view which expands and shows a lower traveling body and an upper turning body. It is a front view of the same position as Drawing 2 showing the state where the side cover was opened. It is a perspective view which shows a lower traveling body and an upper turning body in the state which tilted up the floor member. It is a front view which shows a turning frame, a support frame, an engine, an exhaust gas purification device, etc. It is a top view seen from the upper part of Drawing 5 which shows a turning frame, a support frame, an engine, an exhaust gas purification device, etc. It is a side view seen from the left of FIG. 5 which shows a turning frame, a support frame, an engine, an exhaust gas purification device, etc. It is a perspective view which shows a turning frame, a support frame, an engine, an exhaust gas purification device, etc. It is a front view seen from the same direction as FIG. 5 which shows an exhaust-gas purification apparatus, a bracket, sensors, etc. It is a perspective view which shows the support frame by the 2nd Embodiment of this invention, an exhaust-gas purification apparatus, a bracket, etc. FIG. 10 is a front view showing the exhaust gas purification device, the bracket, the sensors, and the like as viewed from the same direction as FIG. 9. It is a perspective view which shows the support frame by the 3rd Embodiment of this invention, an exhaust-gas purification apparatus, a bracket, etc. FIG. 10 is a front view showing the exhaust gas purification device, the bracket, the sensors, and the like as viewed from the same direction as FIG. 9.

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

  First, FIG. 1 thru | or FIG. 9 has shown the 1st Embodiment of this invention. In the figure, reference numeral 1 denotes a canopy-spec small hydraulic excavator as a construction machine. The hydraulic excavator 1 includes a crawler type lower traveling body 2 having left and right crawlers (crawler belts) 2A, and the lower portion. The upper swing body 3 that is turnably mounted on the traveling body 2 and a swing type work device 4 provided on the front side of the upper swing body 3 are roughly configured. Etc. 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, the upper swing body 3 has a width dimension in the left and right directions substantially equal to the vehicle width of the lower traveling body 2 (the distance between the left and right crawlers 2A), and is formed in a substantially circular shape when viewed from above. Yes. As a result, the excavator 1 is a small rear turning type in which the rear surface of the counterweight 6 (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 counter weight 6, an engine 7, an exhaust pipe 10, a support frame 11, a floor member 12, an exterior cover 17, 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. 6, 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. A left vertical plate 5B and a right vertical plate 5C which are erected on the upper surface side of the bottom plate 5A and extend in the front and rear directions, and a support bracket 5D provided at the front end of the left and right vertical plates 5B and 5C. A substantially arc-shaped left frame member 5E provided on the left side of the bottom plate 5A and a substantially 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 located on the front end side of the revolving frame 5, and a counterweight 6 described later is attached to the rear end side of the bottom plate 5A constituting the revolving frame 5.

  Reference numeral 6 denotes a counterweight provided on the rear side of the revolving frame 5, and the counterweight 6 is made of a heavy object integrally formed using, for example, a casting means, and balances the weight with the work device 4. The counterweight 6 extends in a substantially arc shape in the left and right directions at a position surrounding an engine 7 described later from the rear side.

  Reference numeral 7 denotes an engine mounted on the revolving frame 5 and positioned on the front side of the counterweight 6, and the engine 7 is arranged in a lateral state extending in the left and right directions. A hydraulic pump 8 is disposed on the left side of the engine 7, and the hydraulic pump 8 is driven by the engine 7 to supply operating hydraulic oil to various hydraulic actuators mounted on the hydraulic excavator 1. To do. On the other hand, a heat exchanger 9 such as a radiator or an oil cooler is disposed on the right side of the engine 7, and the heat exchanger 9 is driven by cooling air sucked by a cooling fan 7 </ b> A of the engine 7, thereby generating engine cooling water and hydraulic oil. Etc. to cool the fluid.

  An exhaust pipe 10 is provided connected to the engine 7, and the exhaust pipe 10 discharges exhaust gas discharged from the engine 7 to the outside. Here, an exhaust gas purifying device 19 to be described later is provided in the middle of the exhaust pipe 10. The exhaust gas discharged from the engine 7 is subjected to purification processing, silencing processing, and the like by the exhaust gas purification device 19 and then discharged to the outside of the hydraulic excavator 1.

  Reference numeral 11 denotes a support frame provided on the rear side of the turning frame 5. The support frame 11 is attached to the rear side of the turning frame 5 so as to straddle the engine 7 in order to support the rear side of a floor member 12 described later. ing. Here, the support frame 11 is arranged across the engine and supported by the revolving frame 5, for example, four legs 11 </ b> A, and provided on the upper end side of each leg 11 </ b> A and above the engine 7. A driver seat support portion 11B extending in the left and right directions is roughly configured. And the rear part side of the below-mentioned floor member 12 is supported by the upper surface of the driver's seat support part 11B.

  Reference numeral 12 denotes a floor member located on the revolving frame 5 located on the front side of the engine. The floor member 12 is rotatably attached to the revolving frame 5 at the front side, and the rear side of the floor member 12 is tilted up and down (tilt up and tilt down) with the front side as a fulcrum. It has become. Here, the floor member 12 is provided with a footrest plate 12 </ b> A on which an operator's feet seated in a driver seat 13, which will be described later, are placed, and a driver seat that stands up from the rear side of the footrest plate 12 </ b> A and supports the driver seat 13 It is comprised by the base 12B. The driver seat pedestal 12B is formed in a step shape in which the rear side becomes higher so that an engine 7 and the like to be described below can enter the driver seat pedestal 12B, and the rear side of the driver seat pedestal 12B is the driver seat support portion of the support frame 11. 11B.

  In the state in which the floor member 12 is tilted down, a later-described device housing chamber 18 is closed by the driver seat base 12B of the floor member 12. On the other hand, when the rear side of the floor member 12 is tilted up, as shown in FIG. 4, the equipment storage chamber 18 is open on the rear side of the floor member 12.

  Reference numeral 13 denotes a driver seat provided on the driver seat base 12B of the floor member 12, and the driver seat 13 is seated by an operator of the excavator 1. Further, work levers 14 for operating the work device 4 and the like are disposed on the left and right sides of the driver's seat 13. Further, a traveling lever / pedal 15 is provided on the front side of the driver's seat 13.

  Reference numeral 16 denotes a canopy provided on the floor member 12, and the canopy 16 covers the upper side of the driver's seat 13.

  Reference numeral 17 denotes an exterior cover provided on the revolving frame 5, and the exterior cover 17 constitutes a building of the upper revolving structure 3 together with the counterweight 6. Here, the exterior cover 17 includes a left side cover 17A as a side cover extending forward from the left end side of the counterweight 6, and a left side cover provided so as to cover the periphery of the revolving frame 5 from the tip of the left side cover 17A. A skirt cover 17B, a right side cover 17C (see FIG. 4) extending forward from the right end side of the counterweight 6, and a right skirt cover provided so as to cover the periphery of the revolving frame 5 from the tip of the right side cover 17C (Not shown) and an openable / closable tank cover 17D (see FIG. 4) which is located on the right side and covers the hydraulic oil tank or the like.

  Inside the upper swing body 3 is defined an equipment storage chamber 18 surrounded by the counterweight 6, the driver seat base 12B of the floor member 12, the left and right side covers 17A, 17C of the exterior cover 17, and the like. In the device storage chamber 18, internal devices such as the engine 7, the hydraulic pump 8, the heat exchanger 9, and an exhaust gas purification device 19 described later are stored.

  Here, as shown in FIGS. 2 and 3, the left side cover 17 </ b> A provided between the counterweight 6 and the floor member 12 can be opened and closed when maintaining internal equipment including the engine 7. It has become. For this purpose, the left side cover 17A is detachably attached to the revolving frame 5, the support frame 11 and the like by a fixture 17A1 (see FIG. 2).

  Next, the exhaust gas purification device 19 that purifies the exhaust gas discharged from the engine 7 will be described.

  Reference numeral 19 denotes an exhaust gas purification device 19 provided at an intermediate portion of the exhaust pipe 10. The exhaust gas purification device 19 purifies the exhaust gas discharged from the engine 7. Here, the exhaust gas purification device 19 is located between the driver seat support portion 11 </ b> B of the support frame 11 and the hydraulic pump 8. For this purpose, the exhaust gas purifying device 19 is supported on the upper side of the hydraulic pump 8 by a pair of support brackets 20 fixed to the engine 7 so that the axial direction coincides with the front and rear directions. The exhaust gas purifying device 19 is roughly constituted by a casing 21, which will be described later, an oxidation catalyst 25, and a PM collection filter 26.

  Reference numeral 21 denotes a casing that forms an outer shell of the exhaust gas purifying device 19, and the casing 21 fastens three cylinders of an upstream cylinder 21 </ b> A, an intermediate cylinder 21 </ b> B, and a downstream cylinder 21 </ b> C with bolts and nuts 22. It is comprised by.

  Here, the upstream cylinder 21A constitutes an inlet portion into which exhaust gas flows, and the upstream cylinder 21A includes a cylinder portion 21A1 and an opening on one end side of the cylinder portion 21A1 (an opening on the left end side in FIG. 9). ) And a flange provided on the other end side opening (opening on the right end side in FIG. 9) of the cylindrical portion 21A1. Part 21A4. An inflow pipe 23 having a silencing function is attached to the upstream cylinder 21A so as to extend in the lateral direction, and an oxidation catalyst 25 described later is accommodated in the upstream cylinder 21A.

  The upstream cylinder 21A is provided with a first temperature sensor mounting portion 21A5 located on the upstream side of the oxidation catalyst 25. A detection portion 27A of the first temperature sensor 27 described later is attached to the first temperature sensor attachment portion 21A5. Further, the upstream cylindrical body 21A is provided with a pressure extraction portion 21A6 located on the upstream side of a PM collection filter 26 described later. This pressure extraction portion 21A6 extracts the pressure upstream of the PM collection filter 26 from the pressure of the exhaust gas flowing in the exhaust gas purification device 19, and is connected to the pressure sensor 30 described later via the upstream conduit 31. It is connected.

  Further, a bracket 33 described later is attached to the closing plate portion 21A3 and the flange portion 21A4 of the upstream cylindrical body 21A so as to bridge between them.

  On the other hand, the intermediate cylinder 21B is configured to include a cylinder part 21B1 and flange parts 21B2 and 21B3 provided at both ends of the cylinder part 21B1, respectively. A collection filter 26 is accommodated. The intermediate cylinder 21B is provided with a second temperature sensor attachment portion 21B4 located on the upstream side of the PM collection filter 26. A detection portion 28A of a second temperature sensor 28 described later is attached to the second temperature sensor attachment portion 21B4.

  The downstream cylinder 21C constitutes an outlet part through which exhaust gas flows out. The downstream cylinder 21C includes a bottomed cylinder part 21C1 and a flange part 21C2 provided on the opening side of the bottomed cylinder part 21C1. It is comprised including. A tail pipe 24 having a silencing function is attached to the downstream cylinder 21C so as to extend in the vertical direction.

  The downstream cylinder 21C is provided with a third temperature sensor attachment portion 21C3 located on the downstream side of the PM collection filter 26. A detection portion 29A of a third temperature sensor 29 described later is attached to the third temperature sensor attachment portion 21C3. Further, the downstream cylinder 21C is provided with a pressure extraction portion 21C4 located on the downstream side of the PM collection filter 26. This pressure extraction part 21C4 extracts the pressure on the downstream side of the PM collection filter 26 from the pressure due to the exhaust gas flowing in the exhaust gas purification device 19, and is connected to the pressure sensor 30 described later via the downstream side conduit 32. It is connected.

  Reference numeral 25 denotes an oxidation catalyst provided in the upstream cylinder 21A. The oxidation catalyst 25 oxidizes and removes nitrogen monoxide (NO), carbon monoxide (CO), hydrocarbon (HC), etc. contained in the exhaust gas. To do.

  Reference numeral 26 denotes a PM collection filter (particulate matter removal filter) called DPF (Diesel Particulate Filter) provided in the intermediate cylinder 21B. The PM collection filter 26 includes particulate matter (PM) contained in the exhaust gas. ) Is collected to purify the exhaust gas. Further, the PM collection filter 26 detects the upstream (front) pressure and the downstream (rear) pressure by a pressure sensor 30 to be described later, and when the pressure difference reaches a predetermined value, It is configured to burn and remove substances.

  Next, the temperature sensors 27, 28, 29, the pressure sensor 30 and the like provided for detecting whether the exhaust gas purifying device 19 is functioning normally will be described.

  Reference numeral 27 denotes a first temperature sensor attached to the upstream cylinder 21 </ b> A. The first temperature sensor 27 detects the temperature of the exhaust gas flowing from the inflow pipe 23 toward the oxidation catalyst 25. As shown in FIG. 9, the first temperature sensor 27 includes a detection portion 27A attached to the first temperature sensor attachment portion 21A5 of the upstream cylinder 21A and a harness 27B having one end connected to the detection portion 27A. And a connector 27C provided at the other end of the harness 27B.

  Here, the connector 27C is fitted with a harness (not shown) connected to a controller provided on the vehicle body side so that it can be attached and detached. Further, the connector 27C is detachably attached to a bracket 33 described later using a bolt 27D. And the 1st temperature sensor 27 detects the temperature of the exhaust gas which distribute | circulates toward the oxidation catalyst 25, in order to confirm whether it is the temperature which the oxidation catalyst 25 can produce an appropriate oxidation reaction. .

  Reference numeral 28 denotes a second temperature sensor attached to the intermediate cylinder 21B. The second temperature sensor 28 detects the temperature of the exhaust gas that passes through the oxidation catalyst 25 and flows toward the PM collection filter 26. It is. The second temperature sensor 28 includes a detection portion 28A attached to the second temperature sensor attachment portion 21B4 of the intermediate cylinder 21B, and one end of the detection portion 28A, in substantially the same manner as the first temperature sensor 27 described above. And a connector 28C provided at the other end of the harness 28B.

  Here, the connector 28C is detachably attached to the bracket 33 using a bolt 28D so as to be adjacent to the connector 27C of the first temperature sensor 27, and a harness extending from the controller is fitted. And the 2nd temperature sensor 28 distribute | circulates toward the PM collection filter 26, in order to confirm whether it is the temperature which can burn the particulate matter collected by PM collection filter 26 (regeneration). The temperature of the exhaust gas is detected.

  Reference numeral 29 denotes a third temperature sensor attached to the downstream cylinder 21C. The third temperature sensor 29 detects the temperature of exhaust gas passing through the PM collection filter 26 and flowing toward the tail tube 24. It is. The third temperature sensor 29 includes a detection portion 29A attached to the third temperature sensor attachment portion 21C3 of the downstream cylindrical body 21C and one end substantially the same as the first and second temperature sensors 27 and 28 described above. Is roughly constituted by a harness 29B connected to the detection unit 29A and a connector 29C provided at the other end of the harness 29B.

  Here, the connector 29C is attached to the bracket 33 using the bolt 29D so as to be adjacent to the connector 28C of the second temperature sensor 28, and a harness extending from the controller is fitted. The third temperature sensor 29 detects the temperature of the exhaust gas that has passed through the PM collection filter 26.

  30 is a pressure sensor for detecting the accumulation state (clogged state) of the particulate matter on the PM collection filter 26, and the pressure sensor 30 includes connectors 27C, 28C, 28C of the temperature sensors 27, 28, 29 described above. It is attached to a bracket 33 described later together with 29C. Here, the pressure sensor 30 detects a pressure difference (differential pressure) before and after the PM collection filter 26.

  For this purpose, an upstream conduit 31 is provided between the pressure sensor 30 and the pressure extraction part 21A6 of the upstream cylinder 21A to guide the pressure upstream of the PM collection filter 26 to the pressure sensor 30. A downstream conduit 32 is provided between the pressure sensor 30 and the pressure extraction part 21C4 of the downstream cylinder 21C to guide the downstream pressure of the PM collection filter 26 to the pressure sensor 30.

  The pressure sensor 30 is roughly configured by a detection unit 30A to which the upstream conduit 31 and the downstream conduit 32 are connected, and a main body 30B that houses the detection unit 30A and is connected to a harness from the controller. Further, the collar portion 30C is integrally fixed to the main body portion 30B, and the collar portion 30C is attached to the bracket 33 by using a bolt 30D.

  Next, the bracket 33 for supporting the connectors 27C, 28C, 29C of the temperature sensors 27, 28, 29 and the pressure sensor 30 on the exhaust gas purification device 19 will be described.

  Reference numeral 33 denotes a bracket provided in the exhaust gas purification device 19, and the bracket 33 is for detachably attaching sensors to an upper position of the exhaust gas purification device 19. That is, the bracket 33 includes connectors 27C, 28C, 29C of the first, second, and third temperature sensors 27, 28, 29 for detecting the temperature of the exhaust gas purified by the exhaust gas purifying device 19, and the exhaust gas. The pressure sensor 30 for detecting the pressure (pressure difference before and after the PM collection filter 26) is detachably provided (attached) using bolts 27D, 28D, 29D, and 30D, respectively.

  Here, the bracket 33 is formed by bending a metal plate such as a steel plate, for example, and extends in the length direction of the exhaust gas purifying device 19 with the connectors 27C, 28C, 29C and the pressure. A horizontal plate portion 33A to which the sensor 30 is attached, and a direction approaching the exhaust gas purification device 19 from one end side of the horizontal plate portion 33A (front of the upper swing body 3, rearward front side, left side of FIG. 9, left side of the right side). An inclined plate portion 33B extending obliquely in front, a front vertical plate 33C extending vertically downward from one end side of the inclined plate portion 33B, and the other end side of the horizontal plate portion 33A (in front of the upper swing body 3, rearward in the rear direction). Side, left and right side in FIG. 9) and rear vertical plate 33 </ b> D extending downward in the vertical direction.

  The bracket 33 attaches (fastens) the front vertical plate 33C to the closing plate portion 21A3 of the upstream cylindrical body 21A using bolts and nuts 21A2, and also attaches the rear vertical plate 33D to the flange portion 21A4 of the upstream cylindrical body 21A. By attaching (fastening together) using bolts and nuts 22, the exhaust gas purification device 19 is positioned above and at one end in the length direction (front of the upper swing body 3, front of the rear, left side of FIG. 9, It is provided at a position closer to the left side in the right direction. As a result, the connectors 27C, 28C, 29C of the temperature sensors 27, 28, 29 and the pressure sensor 30 allow the driver seat of the support frame 11 when the left side cover 17A of the exterior cover 17 is opened as shown in FIG. It is configured so that it can be attached and detached from the inside of the support portion 11B.

  Accordingly, the exhaust gas purifying device 19 performs maintenance with the left side cover 17A of the exterior cover 17 as shown in FIG. 3 opened, without the floor member 12 being tilted up as shown in FIG. It can be carried out. For this reason, the maintenance work of the exhaust gas purification device 19 can be easily performed.

  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, the engine 7 is first operated to drive the hydraulic pump 8.

  In this state, an operator seated in the driver's seat 13 operates the traveling lever / pedal 15 to cause the lower traveling body 2 to self-propel and move the hydraulic excavator 1 to the work site. 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 the work lever 14.

  During operation of the hydraulic excavator 1, exhaust gas discharged from the engine 7 is introduced into the exhaust gas purification device 19 through the exhaust pipe 10. Then, the exhaust gas introduced into the exhaust gas purification device 19 is oxidized and removed by the oxidation catalyst 25, such as nitrogen monoxide (NO), carbon monoxide (CO), hydrocarbon (HC), etc. in the exhaust gas. The particulate matter (PM) in the exhaust gas is collected by the collecting filter 26 and then discharged to the outside of the excavator 1 through the tail tube 24.

  Next, the maintenance work of the exhaust gas purification device 19 will be described.

  When performing maintenance of the exhaust gas purification device 19, the left side cover 17A of the exterior cover 17 is opened (removed) as shown in FIG. Then, through the opening formed between the left end portion of the counterweight 6 and the left skirt cover 17B, maintenance work such as repair, inspection and replacement of the exhaust gas purification device 19 can be performed.

  At this time, for example, when exchanging the temperature sensors 27, 28, 29, the inside of the driver seat support portion 11B of the support frame 11, that is, from between the driver seat support portion 11B of the support frame 11 and the leg portion 11A. Hands and tools are inserted, and the detection portions 27A, 28A, 29A are removed from the sensor attachment portions 21A5, 21B4, 21C3, and bolts 27D, 28D, 29D for fixing the connectors 27C, 28C, 29C to the bracket 33 are removed. Thereby, the temperature sensors 27, 28, and 29 can be taken out between the driver seat support portion 11B and the leg portion 11A of the support frame 11.

  When the temperature sensors 27, 28, 29 are attached to the exhaust gas purification device 19, the connectors 27 C, 28 C, 29 C are connected to the bracket 33 with bolts 27 D, 28 D between the driver seat support part 11 B and the leg part 11 A of the support frame 11. , 29D, and the detection portions 27A, 28A, 29A can be attached to the sensor attachment portions 21A5, 21B4, 21C3. The pressure sensor 30 is also connected to the bracket 33 through the space between the driver seat support portion 11B and the leg portion 11A of the support frame 11 in the same manner as the attachment and removal of the connectors 27C, 28C, 29C of the temperature sensors 27, 28, 29. On the other hand, it can be installed and removed.

  According to the present embodiment, the connectors 27C, 28C, 29C of the temperature sensors 27, 28, 29 and the pressure sensor 30 are connected from the inside of the driver seat support portion 11B of the support frame 11 when the left side cover 17A is opened. It is configured so that it can be installed and removed. For this reason, even if the floor member 12 is not tilted up, operations such as repair, inspection, and replacement of the temperature sensors 27, 28, and 29 and the pressure sensor 30 can be performed. Thereby, the maintenance work of the exhaust gas purification device 19 can be easily performed.

  Moreover, according to the present embodiment, the connectors 27C, 28C, 29C of the temperature sensors 27, 28, 29 and the pressure sensor 30 are attached to the upper position of the exhaust gas purification device 19 via the bracket 33. Therefore, the connectors 27C, 28C, 29C of the temperature sensors 27, 28, 29 and the pressure sensor 30 can be easily attached and detached from the upper position of the exhaust gas purifying device 19. For this reason, also from this aspect, the maintenance work of the exhaust gas purifying device 19 can be easily performed.

  Next, FIG. 10 and FIG. 11 show a second embodiment of the present invention. The feature of the present embodiment is that the connector of the temperature sensor and the pressure sensor are attached to the exhaust gas purification device via separate brackets. 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 41 denotes a first bracket provided in the exhaust gas purification device 19, and the first bracket 41 is located above the exhaust gas purification device 19 in the first, second and third temperature sensors 27. 28, 29 for detachably attaching the connectors 27C, 28C, 29C.

  Here, the first bracket 41 is substantially the same as the bracket 33 of the first embodiment described above, and extends in the length direction of the exhaust gas purification device 19 and is attached to the connectors 27C, 28C, 29C. Portion 41A and an inclined plate portion 41B extending obliquely in a direction approaching the exhaust gas purifying device 19 from one end side of the horizontal plate portion 41A (front of the upper revolving structure 3, rearward front side, left side of FIG. And a front vertical plate 41C extending downward in the vertical direction from one end side of the inclined plate portion 41B, and the other end side of the horizontal plate portion 41A (in front of the upper swing body 3, rearward in the rear direction, left and right in FIG. 11) And a rear vertical plate 41D extending downward in the vertical direction from the right side in the direction).

  The first bracket 41 attaches (fastens together) the front vertical plate 41C to the closing plate portion 21A3 of the upstream cylindrical body 21A using bolts and nuts 21A2, and also attaches the rear vertical plate 41D to the flange of the upstream cylindrical body 21A. By attaching (fastening together) the bolts and nuts 22 to the portion 21A4, they are provided at a position above the exhaust gas purification device 19 and closer to one end in the length direction. Thus, the connectors 27C, 28C, 29C of the temperature sensors 27, 28, 29 can be attached and removed from the inside of the driver seat support portion 11B of the support frame 11 when the left side cover 17A of the exterior cover 17 is opened. It is configured.

  Reference numeral 42 denotes a second bracket provided in the exhaust gas purification device 19, and the second bracket 42 is for detachably attaching the pressure sensor 30 to a position below the exhaust gas purification device 19.

  Here, the second bracket 42 extends in the length direction of the exhaust gas purifying device 19 and has a horizontal plate portion 42A to which the pressure sensor 30 is attached, and one end side of the horizontal plate portion 42A (front and rear of the upper swing body 3). It is generally constituted by a vertical plate 42B extending from the front side in the direction, the left side in FIG. 11 and the left side in the right direction) to the upper side in the vertical direction.

  The second bracket 42 is attached to the closing plate portion 21A3 of the upstream cylindrical body 21A using the bolt / nut 21A2 (fastened together) at the lower position of the exhaust gas purifying device 19 and It is provided at a position closer to one end in the length direction. Accordingly, the pressure sensor 30 is configured to be attached and detached from the inside of the driver seat support portion 11B of the support frame 11 when the left side cover 17A of the exterior cover 17 is opened.

  Reference numeral 43 denotes an upstream conduit provided between the pressure sensor 30 and the pressure take-out portion 21A6 of the upstream cylinder 21A, and 44 denotes a pressure take-out portion 21C4 between the pressure sensor 30 and the downstream cylinder 21C. A downstream conduit is shown.

  In the present embodiment, the connectors 27C, 28C, 29C of the temperature sensors 27, 28, 29 and the pressure sensor 30 are separately provided in the upward and downward directions using the first bracket 41 and the second bracket 42 as described above. The basic action is not different from that according to the first embodiment described above.

  In particular, in the case of the present embodiment, the connectors 27C, 28C, 29C of the temperature sensors 27, 28, 29 and the pressure sensor 30 are attached to the exhaust gas purification device 19 via separate brackets 41, 42, respectively. Therefore, the freedom degree of the attachment position of connector 27C, 28C, 29C and the pressure sensor 30 can be raised. As a result, the connectors 27C, 28C, 29C and the pressure sensor 30 can be disposed at positions where attachment and removal can be performed more easily.

  Next, FIG. 12 and FIG. 13 show a third embodiment of the present invention. A feature of the present embodiment is that the connector of the temperature sensor and the pressure sensor are attached to the lower position of the exhaust gas purification device. 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.

  Reference numeral 51 denotes a bracket provided in the exhaust gas purification device 19, and the bracket 51 can attach and detach the connectors 27 </ b> C, 28 </ b> C, 29 </ b> C of the temperature sensors 27, 28, 29 and the pressure sensor 30 to a position below the exhaust gas purification device 19. It is for mounting on.

  Here, the bracket 51 includes a horizontal plate portion 51A that extends in the length direction of the exhaust gas purification device 19 and to which the pressure sensor 30 is attached, and one end side of the horizontal plate portion 51A (in front of the upper swing body 3, the front side in the rear direction, The vertical plate 51B is attached to the connectors 27C, 28C, and 29C of the temperature sensors 27, 28, and 29 that extend vertically upward from the left and right sides in FIG.

  The bracket 51 is attached to the closing plate portion 21A3 of the upstream cylindrical body 21A using a bolt / nut 21A2 (fastened together), so that the bracket 51 is positioned below the exhaust gas purification device 19 and has a length. It is provided at a position closer to one end in the direction. Thus, the connectors 27C, 28C, 29C of the temperature sensors 27, 28, 29 and the pressure sensor 30 are attached from the inside of the driver seat support portion 11B of the support frame 11 when the left side cover 17A of the exterior cover 17 is opened. , It is configured to be removable.

  Reference numeral 52 denotes an upstream conduit provided between the pressure sensor 30 and the pressure extraction part 21A6 of the upstream cylinder 21A, and 53 denotes between the pressure sensor 30 and the pressure extraction part 21C4 of the downstream cylinder 21C. A downstream conduit is shown.

  In the present embodiment, the brackets 51 as described above are used to support the connectors 27C, 28C, 29C of the temperature sensors 27, 28, 29 and the pressure sensor 30, and the basic operation of the first embodiment is described above. There is no particular difference from the embodiment.

  In particular, in the case of the present embodiment, the connectors 27C, 28C, 29C of the temperature sensors 27, 28, 29 and the pressure sensor 30 are attached to the lower position of the exhaust gas purification device 19 via the bracket 51. Therefore, the connectors 27C, 28C, and 29C of the temperature sensors 27, 28, and 29 and the pressure sensor 30 can be easily attached and detached from the lower position of the exhaust gas purification device 19.

  In each of the above-described embodiments, the canopy-type hydraulic excavator 1 including the canopy 16 that covers the driver's seat 13 from above is described as an example. However, the present invention is not limited to this. For example, the present invention may be applied to a cab-type hydraulic excavator in which a cab is provided on a floor member and a driver's seat is disposed in the cab.

  Furthermore, in each embodiment mentioned above, the hydraulic excavator 1 provided with the crawler type lower traveling body 2 is described as an example as a construction machine. However, the present invention is not limited to this, and can also be applied to other construction machines such as a hydraulic excavator provided with a wheel-type lower traveling body and a hydraulic crane.

1 Excavator (construction machine)
DESCRIPTION OF SYMBOLS 2 Lower traveling body 3 Upper revolving body 4 Working apparatus 5 Turning frame 6 Counterweight 7 Engine 8 Hydraulic pump 9 Heat exchanger 10 Exhaust pipe 11 Support frame 11A Leg part 11B Driver's seat support part 12 Floor member 17 Exterior cover 17A Left side cover (Side cover)
DESCRIPTION OF SYMBOLS 19 Exhaust gas purification device 27 1st temperature sensor 27C connector 28 2nd temperature sensor 28C connector 29 3rd temperature sensor 29C connector 30 Pressure sensor 33,51 Bracket 41 1st bracket 42 2nd bracket

Claims (4)

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 in which the working device is provided on the front side;
A counterweight provided on the rear side of the swivel frame to balance the weight with the working device;
An engine that is positioned in front of the counterweight and is mounted horizontally on the swivel frame in a left-right direction, a hydraulic pump is provided on one side, and a heat exchanger is disposed on the other side;
An exhaust pipe connected to the engine and exhausting exhaust gas discharged from the engine to the outside;
A support frame in which a leg supported by the swivel frame is arranged so as to straddle the engine, and an upper end side is a driver seat support;
A floor member that is positioned on the front side of the engine and disposed on the revolving frame and whose rear side is supported by a driver seat support portion of the support frame;
A side cover is provided between the counterweight and the floor member, located on one side of the upper revolving unit in the left and right directions, and is opened and closed when maintaining the internal equipment including the engine. In construction machinery
Provided between the driver seat support part of the support frame and the hydraulic pump is an exhaust gas purification device that purifies exhaust gas exhausted from the engine located in the middle of the exhaust pipe,
The exhaust gas purification device is provided with a bracket for mounting sensors,
The bracket is provided with a temperature sensor connector for detecting the temperature of the exhaust gas purified by the exhaust gas purification device and a pressure sensor for detecting the pressure of the exhaust gas,
The construction machine characterized in that the connector of the temperature sensor and the pressure sensor can be attached and detached from the inside of the driver seat support portion of the support frame when the side cover is opened.   The construction machine according to claim 1, wherein the connector of the temperature sensor and the pressure sensor are attached to an upper position of the exhaust gas purification device via the bracket.   The construction machine according to claim 1, wherein the connector of the temperature sensor and the pressure sensor are attached to a lower position of the exhaust gas purification device via the bracket.   The construction machine according to claim 1, wherein the connector of the temperature sensor and the pressure sensor are configured to be attached to the exhaust gas purification device via different brackets.

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