DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described with reference to the drawings.
First, the configuration of a hydraulic excavator to which the spirit of the present invention is applicable will be described.
1 is a side view showing a configuration of a hydraulic excavator according to an embodiment of the present invention. 1, the hydraulic excavator 1 according to the present embodiment includes a lower traveling body 2, an upper revolving body 3, a working machine 4, a counterweight 5, an engine (not shown) 7, and a cap 10 are mainly provided. The hydraulic excavator main body is mainly composed of the lower traveling body 2 and the upper revolving structure 3. [
The lower cruising body 2 has a pair of infinite orbits P wound on both left and right ends in the traveling direction. The lower cruising body 2 is configured to be capable of self-running by rotating a pair of endless paths P.
The upper swing body 3 is provided so as to be pivotable in an arbitrary direction with respect to the lower traveling body 2. [ The upper revolving structure 3 includes a cap 10 serving as a cab for the operator of the hydraulic excavator 1 to ride on the front left side. The upper revolving structure 3 includes an engine room for accommodating the engine 7 and a counterweight 5 on the rear side.
In the present embodiment, the front side (front side) of the driver is set to the front side of the upper swing body 3 while the driver is seated in the cab 10, and the rear side of the driver is set to the front side of the upper swing body 3, The left side of the driver in the seating state is set to the left side of the upper swivel body 3 and the right side of the driver in the seating state is set to the right side of the upper swivel body 3. [ In the following description, the front and rear left and right portions of the upper revolving structure 3 and the front and rear right and left sides of the hydraulic excavator 1 coincide with each other. The side closer to the center of the upper swing body 3 is set to the inner side and the side remote from the center of the upper swing body 3 is set to the outer side. In the following drawings, the forward and backward directions are indicated by the arrow X in the drawing, the left and right direction is indicated by the arrow Y, and the vertical direction is indicated by the arrow Z in the figure.
The working machine 4 that performs the work such as excavation of the gravel is pivotally supported by the upper revolving structure 3 so as to be operable in the vertical direction. The working machine 4 is provided with a boom 4a operatively attached in the vertical direction at a substantially central portion on the front side of the upper revolving structure 3 and an arm 4b operatively attached to the front end portion of the boom 4a 4b and a bucket 4c operatively attached to the distal end of the arm 4b in the forward and backward directions. The boom 4a, the arm 4b and the bucket 4c are configured to be driven by the hydraulic cylinder 58, respectively.
The operator 4 is provided on the right side of one side of the cap 10 with respect to the cap 10 so that an operator aboard the cap 10 can view the front end of the working machine 4. In the cap 10, the working machine 4 is disposed on the side of the attachment portion.
The counterweight 5 is a weight disposed on the rear portion of the upper revolving structure 3 for balancing the vehicle body during mining or the like. The hydraulic excavator 1 is formed as a rear small-sized hydraulic excavator in which the turning radius of the rear surface of the counterweight 5 is reduced. Therefore, the rear surface of the counterweight 5 is formed in an arc shape centered on the turning center of the upper revolving structure 3 as viewed from above. The engine 7 is housed in the engine compartment at the rear portion of the upper revolving structure 3.
2 is a perspective view showing a part of the structure of the upper revolving structure 3 of the hydraulic excavator 1 of Fig. Fig. 2 shows a part of the configuration of the upper revolving structure 3 of the hydraulic excavator 1 shown in Fig. 1 viewed from the left front. As shown in FIG. 2, the upper revolving structure 3 has a revolving frame 31. The revolving frame 31 is contained in the hydraulic excavator main body. The revolving frame 31 is disposed above the lower traveling body 2 shown in Fig. 1 and is provided so as to be pivotable in an arbitrary direction with respect to the lower traveling body 2. As shown in Fig.
On the upper surface of the revolving frame 31, a pair of floor frames 32, 32 are arranged with an interval in the longitudinal direction. The cap 10 is disposed on the floor frames 32, The cap 10 is mounted on the revolving frame 31 through the floor frame 32.
A center bracket 33 is provided at the front end of the center portion in the left-right direction of the revolving frame 31. [ The base end portion of the working machine 4 shown in Fig. 1 is attached to the center bracket 33. Fig. The center bracket 33 supports the working machine 4 of the hydraulic excavator 1 and constitutes an attaching portion of the working machine 4. [
On the front right side of the revolving frame 31, a front cover 60 is disposed. Tank covers 36A and 38A are disposed on the rear side with respect to the front cover 60. [ 3 is a perspective view showing the configuration of the front cover 60 and the tank covers 36A and 38A. In the front cover 60, a tank room 92 and a valve room 97 described later are formed. A fuel tank 36 to be described later is accommodated in the tank cover 36A. An oil supply port 36B for supplying fuel to the fuel tank 36 is provided on the upper surface of the tank cover 36A. Inside the tank cover 38A, an operation oil tank 38 to be described later is accommodated.
The front cover (60) has an opening / closing cover (61) and a left side face plate (62). The opening / closing cover 61 constitutes a right side surface of the front cover 60 and constitutes a part of a side surface of the hydraulic excavator main body. The opening / closing cover 61 extends from the front end of the tank cover 36A toward the front end of the upper revolving structure 3. [ The opening and closing cover 61 is provided so as to be openable and closable. The opening / closing cover 61 has a handle 61A. The worker can open the cover 61 in the closed state by holding the handle 61A and rotating the opening / closing cover 61. [
The left side face plate 62 shown in Fig. 2 constitutes the left side face of the front cover 60. Fig. The left side face plate 62 is opposed to the opening / closing cover 61 via a reducing agent tank 20, a main valve 57 and the like to be described later. The left side face plate 62 is opposed to the right side face of the cap 10 with the center bracket 33 interposed therebetween. The left side face plate (62) extends in the front and rear direction of the upper revolving body (3). A vent hole 69 is formed in the left side face plate 62. The vent hole 69 communicates with the outer space of the front cover 60 and the tank room 92 formed inside the front cover 60.
The front cover 60 also has a front end plate 63, a bottom step plate 64, a vertical plate 65, an upper step plate 66, a vertical plate 67, and a top plate 68. The front cover 60 is provided between the front ends of the tank covers 36A and 38A and the upper swivel body 3. [
The front end plate (63) extends in the vertical direction at the front end of the upper revolving body (3). The lower step plate 64 extends rearward from the upper edge of the front end plate 63. The vertical plate (65) extends upward from the rear edge of the lower step plate (64). The upper step plate 66 extends rearward from the upper edge of the vertical plate 65. The vertical plate 67 extends upward from the rear edge of the upper step plate 66. The ceiling plate 68 extends rearward from the upper edge of the vertical plate 67. The top plate 68 is disposed on substantially the same plane as the top surface of the tank cover 38A.
And a step 34 is provided so as to protrude forward from the front end plate 63. The front stage plate 63, the bottom stage plate 64, the vertical plate 65, the upper step plate 66, the vertical plate 67, and the top plate 68 constitute a stepped shape. The lower step plate 64 and the upper step plate 66 of the front cover 60 are stepped in order from the step 34 so that access to the ceiling plate 68 is facilitated. Thereby, the operator can easily and safely perform operations such as replenishment of fuel to the fuel tank 36, lubrication to the working oil tank 38, and maintenance of the engine 7.
Next, the path of the reducing agent pipe from the reducing agent tank to the exhaust gas processing unit in the hydraulic excavator 1 of the present embodiment will be described with reference to Fig. Fig. 4 is a schematic plan view showing the arrangement of each device on the revolving frame 31. Fig. The lower side in Fig. 4 shows the front of the upper revolving structure 3, and the upper side in Fig. 4 shows the rear side of the upper revolving structure 3. Fig. 4 shows a hydraulic excavator 1 shown in Fig. 1 in which piping for supplying a reducing agent from the reducing agent tank 20 to the exhaust treatment unit (the conveying piping 21 and the pressure conveying piping 25) are shown.
The engine 7, which is a power source for driving the lower traveling body 2 and the working machine 4 shown in Fig. 1, is mounted on the revolving frame 31. Fig. The engine 7 is mounted on the rear portion of the center frame of the center of the revolving frame 31 in the left and right direction. The heavy engine 7 is separated from the center bracket 33 that supports the working machine 4 and the counter weight 5 is provided in consideration of the weight balance with the working machine 4 attached to the front of the hydraulic excavator main body. At the rear end of the hydraulic excavator main body. An engine room for housing the engine 7 is provided at the rear portion of the upper revolving structure 3.
A cooling unit (6) and a fan (8) are accommodated in the engine compartment. The cooling unit 6, the fan 8, and the engine 7 are arranged in this order from the left to the right in the engine compartment. The fan 8 is rotationally driven by the engine 7 to generate a flow of air passing through the engine compartment. The fan (8) generates a flow of air from the left side to the right side of the hydraulic excavator main body. The cooling unit 6 is disposed on the left side with respect to the fan 8, which is the upstream side of the flow of air generated by the fan 8. The engine 7 is disposed on the right side with respect to the fan 8, which is the downstream side of the air flow generated by the fan 8.
The cooling unit 6 includes a radiator 16 (FIG. 5) described later, an intercooler, and an oil cooler. The radiator 16 is a cooling device for cooling the cooling water of the engine 7. [ The intercooler is a cooling device for cooling the compressed air supplied to the engine 7. The oil cooler is a cooling device for cooling hydraulic oil supplied to various hydraulic actuators mounted on the hydraulic excavator 1, such as a hydraulic cylinder 58 (Fig. 1).
The hydraulic excavator 1 also has an exhaust processing unit for treating and purifying the exhaust gas discharged from the engine 7 in the engine room. The exhaust treatment unit is mainly provided with exhaust treatment devices 12 and 14, a relay connection pipe 13, an exhaust pipe 15, and a reducing agent injection nozzle 28. 4, the exhaust processing unit is disposed on the right side with respect to the engine 7. [ The engine 7 is directly connected to a hydraulic pump 56 which is driven by the engine 7 to transfer the hydraulic oil. The hydraulic pump 56 is disposed on the right side of the engine 7 and the exhaust processing unit is disposed above the hydraulic pump 56.
The exhaust treatment device 12 is connected to the engine 7 by an exhaust pipe 11 (Fig. 5) described later. The exhaust treatment device 14 is connected to the exhaust treatment device 12 by the relay connection pipe 13. The exhaust gas discharged from the engine 7 passes through the exhaust treatment devices 12 and 14 in order and is discharged to the atmosphere from the exhaust chamber 15. [ The exhaust treatment device 12 is disposed on the downstream side of the engine 7 and the exhaust treatment device 14 is disposed on the downstream side of the exhaust treatment device 12 Respectively.
The exhaust treatment device 12 oxidizes unburned gases such as carbon monoxide and hydrocarbons contained in the exhaust gas discharged from the engine 7 to lower the concentration of the unburned gas in the exhaust gas. The exhaust treatment device 12 is, for example, a diesel oxidation catalyst device. The exhaust treatment device 14 reduces the nitrogen oxide contained in the exhaust gas by the reaction with the reducing agent and chemically changes the nitrogen oxide into a harmless nitrogen gas to lower the nitrogen oxide concentration in the exhaust gas. The exhaust treatment device 14 is, for example, a selective catalytic reduction type denitration device. The relay connection pipe (13) is provided with a spray nozzle (28) for spraying a reducing agent into the relay connection pipe (13). The relay connection pipe 13 has a function as a mixing pipe for injecting and mixing a reducing agent into the exhaust gas.
The hydraulic excavator 1 further includes a reducing agent supply unit for supplying a reducing agent to the exhaust treatment unit. The reducing agent supply unit includes a reducing agent tank 20 and a reducing agent pump 22. The reducing agent tank (20) stores the reducing agent used in the exhaust treatment device (14). As the reducing agent, for example, urea water is suitably used, but it is not limited thereto.
The reducing agent tank 20 and the reducing agent pump 22 are mounted on the right side of the revolving frame 31. The reducing agent pump 22 is disposed in front of the engine compartment. The reducing agent tank 20 is disposed forward of the reducing agent pump 22. The reducing agent tank 20 is disposed apart from the engine 7 which is a high-temperature apparatus and is disposed, for example, at the front end of the revolving frame 31 in order to prevent the reducing agent from deteriorating due to temperature rise.
The reducing agent tank 20 and the reducing agent pump 22 are connected to each other by the transfer pipe 21 and the return pipe 23. The transfer pipe 21 is a pipe for sending the reducing agent from the reducing agent tank 20 to the reducing agent pump 22. The return pipe 23 is a pipe for returning the reducing agent from the reducing agent pump 22 to the reducing agent tank 20. The reducing agent pump 22 and the injection nozzle 28 are connected to each other by a press-feeding pipe 25. The pressure feeding pipe 25 is a pipe for feeding the reducing agent from the reducing agent pump 22 to the jetting nozzle 28.
The reducing agent transferred from the reducing agent tank 20 to the reducing agent pump 22 via the transfer pipe 21 is branched into two branches by the reducing agent pump 22. The reducing agent which is not used for the exhaust treatment is returned to the reducing agent tank 20 via the return pipe 23 from the reducing agent pump 22. The reducing agent used in the exhaust process reaches the injection nozzle 28 from the reducing agent pump 22 via the pressure feed pipe 25 and is sprayed into the relay connection pipe 13 from the injection nozzle 28.
The exhaust gas from the engine 7 flows into the exhaust treatment device 14 via the relay connection pipe 13. The relay connection pipe 13 is provided on the upstream side of the exhaust gas treatment device 14 in the flow of the exhaust gas. The reducing agent sucked from the reducing agent tank 20 is injected into the exhaust gas flowing through the relay connection pipe 13 via the injection nozzle 28 attached to the relay connection pipe 13. The reducing agent is injected to the exhaust treatment device 14 on the upstream side of the flow of the exhaust gas. The amount of the reducing agent injected into the exhaust gas is controlled based on the temperature of the exhaust gas passing through the exhaust gas treatment device 14 and the concentration of nitrogen oxide in the exhaust gas.
The reducing agent tank 20 is disposed at the front end on the revolving frame 31 and the exhaust treatment apparatus 14 is disposed at the rear end of the revolving frame 31. [ Because of this arrangement, the transfer pipe 21 and the press-feed pipe 25 for transferring the reducing agent extend in the front-rear direction of the hydraulic excavator main body and extend from the front end to the rear end of the revolving frame 31.
A fuel tank 36, a working oil tank 38 and a main valve 57 are also mounted on the right side side frame of the revolving frame 31. The fuel tank 36 accumulates the fuel supplied to the engine 7. The working oil tank 38 accumulates operating oil supplied to the hydraulic actuator such as the hydraulic cylinder 58 (Fig. 1).
The revolving frame 31 has side edges 31e which are side edge portions. The fuel tank 36 has a side surface 36s. The right side surface 36s of the fuel tank 36 protrudes outward beyond the lateral edge 31e of the revolving frame 31. [ As a result, the volume of the fuel tank 36 is increased, and it becomes possible to accumulate more fuel in the fuel tank 36.
The fuel tank 36 and the working oil tank 38 are disposed at a position in front of the exhaust processing unit in consideration of the weight balance on the revolving frame 31 because the weight is large. The fuel tank 36 is arranged nearer to the side edge 31e of the revolving frame 31 than the working oil tank 38 in consideration of the workability of replenishing the fuel to the fuel tank 36. [ The fuel tank 36 and the working oil tank 38 are formed as a rectangular parallelepiped type pressure-resistant tank. The front surfaces of the fuel tank 36 and the hydraulic oil tank 38 are configured as a rear wall of the valve room 97 that houses the main valve 57. [
The main valve 57 is configured as an aggregate of a plurality of control valves, pilot valves, and the like. The main valve 57 distributes the hydraulic oil drawn from the hydraulic oil tank 38 and conveyed by the hydraulic pump to a hydraulic actuator such as a hydraulic cylinder 58 shown in Fig. 1, a traveling motor and a swing motor, not shown. The main valve 57 operates the vehicle body of the hydraulic excavator 1 and the working machine 4 in accordance with the operation of the operator.
The weight of the main valve 57 is smaller than that of the fuel tank 36 and the hydraulic oil tank 38. Therefore, Respectively. The main valve 57 is disposed rearward with respect to the reducing agent tank 20.
The valve chamber 97 for accommodating the main valve 57 and the tank chamber 92 for accommodating the reducing agent tank 20 are partitioned by the partition plate 80. The partition plate 80 is disposed behind the reducing agent tank 20 and in front of the main valve 57 and disposed between the reducing agent tank 20 and the main valve 57. The partition plate 80 is interposed between the reducing agent tank 20 and the main valve 57 in the front-rear direction of the upper revolving structure 3.
The partition plate 80 is configured as a front wall of the valve chamber 97. The partition plate 80 is configured as a rear wall of the tank room 92. The front wall of the tank room 92 is constituted by a front end plate 63 shown in Figs. The right side wall of the tank room 92 is constituted by the opening / closing cover 61 in the closed state shown in Fig. The left side wall of the tank room 92 is constituted by a left side face plate 62 shown in Fig.
The opening and closing cover 61, the left side face plate 62, the front end plate 63 and the partition plate 80 constitute a wall portion defining the tank room 92. Of the wall portions defining the tank chamber 92, only the partition plate 80, which is the wall portion behind, is interposed between the main valve 57 and the reducing agent tank 20. A vent hole 69 (FIG. 2) is formed in the left side face plate 62, which is a wall portion on the left side, of the wall portion defining the tank room 92. The vent hole (69) is configured as a communication hole communicating the inside and the outside of the tank room (92).
The reducing agent tank 20 is disposed in a corner portion of the tank room 92 in a plan view in front of the tank room 92. The reducing agent tank 20 is formed in a substantially rectangular parallelepiped shape. The front face of the reducing agent tank 20 faces the front end plate 63 with a slight gap between the front end plate 63 and the front face. The left side face of the reducing agent tank 20 faces the left side face plate 62 with a slight gap between the left side face plate 62 and the left face side face. The reducing agent tank 20 is disposed at a position closer to the front wall than the front wall and the rear wall of the tank room 92.
A reducing agent tank 20 is disposed at each corner portion formed by the front end plate 63 and the left side face plate 62. As shown in Figs. 2 and 3, the front end portion of the opening / closing cover 61 is curved. Therefore, by arranging the rectangular reducing agent tank 20 adjacent to the left side face plate 62 in a plan view, it is possible to arrange the reducing agent tank 20 closer to the wall portion defining the tank chamber 92 .
5 is a functional diagram schematically showing the path of the reducing agent, the path of the heat exchange medium, and the exhaust path of the exhaust gas from the engine 7 in the hydraulic excavator 1 of the present embodiment. 5, the exhaust gas discharged from the engine 7 passes through the exhaust pipe 11, the exhaust gas treatment device 12, the relay connection pipe 13 and the exhaust gas treatment device 14 in this order, To the outside of the vehicle. An injection nozzle 28 is provided in the relay connection pipe 13 on the upstream side of the flow of the exhaust gas to the exhaust treatment device 14.
A reducing agent (90) is stored in the reducing agent tank (20). A draft tube (24) through which the reducing agent (90) flowing out of the reducing agent tank (20) flows is arranged inside the reducing agent tank (20). A strainer (strainer) 26 is connected to the tip of the draft tube 24. The draft tube (24) is connected to the transfer tube (21). The reducing agent 90 sucked from the reducing agent tank 20 is fed by the reducing agent pump 22 and reaches the injection nozzle 28 via the feed pipe 21 and the press feed pipe 25 in this order. The reducing agent 90 not used for the exhaust treatment is returned to the reducing agent tank 20 via the return pipe 23 from the reducing agent pump 22.
The injection nozzle 28 has a function as a reducing agent injector that injects the reducing agent 90 sucked from the reducing agent tank 20 to the exhaust treatment device 14 on the upstream side of the exhaust gas. The reducing agent (90) is supplied to the exhaust gas flowing through the relay connection pipe (13) by the injection nozzle (28). In the exhaust treatment device 14, the nitrogen oxide contained in the exhaust gas reacts with the reducing agent 90, so that the concentration of the nitrogen oxide in the exhaust gas decreases. When the reducing agent 90 is urea water, the urea water is decomposed into ammonia in the relay connecting pipe 13, and the nitrogen oxide is decomposed into harmless nitrogen and oxygen by the reaction between the nitrogen oxide and ammonia. The exhaust gas whose amount of nitrogen oxides has been reduced to an appropriate value is discharged from the exhaust box 15.
Inside the reducing agent tank 20, there is disposed a heat exchanger 40 through which a medium (heat exchange medium) for heat exchange with the reducing agent 90 flows. As the heat exchange medium, cooling water of the engine 7 is used. The heat exchanger 40 has a first conduit for guiding the heat exchange medium into the reducing agent tank 20 and a second conduit for discharging the heat exchange medium from the reducing agent tank 20. [ The first conduit is connected to the cooling water pipe (17). The second conduit is connected to the cooling water pipe (18). In the cooling water pipe 18, a radiator 16 and a cooling water pump 19 are provided.
The cooling water of the engine 7 flows circulatingly through the engine 7, the heat exchanger 40, the radiator 16, and the cooling water pump 19 by driving the cooling water pump 19. The cooling water heated by the engine 7 is cooled by heat exchange with the reducing agent 90 in the heat exchanger 40. On the other hand, the reducing agent (90) is heated by receiving heat from the cooling water. The radiator 16 is a heat exchanger for performing heat exchange between cooling water and air to cool the cooling water. The cooled cooling water in the radiator 16 flows to the water jacket of the engine 7, so that the engine 7 is appropriately cooled.
The reducing agent tank 20 is disposed at the front end of the revolving frame 31. The cooling unit 6 including the engine 7 and the radiator 16 is disposed on the rear side of the revolving frame 31. [ Because of this arrangement, the cooling water pipe 17 connecting the reducing agent tank 20 and the engine 7 and the cooling water pipe 18 connecting the reducing agent tank 20 and the radiator 16 are arranged in the forward and backward directions And extends between the tank room 92 at the front end of the revolving frame 31 and the rear engine room.
6 is a perspective view of the hydraulic excavator 1 shown in Fig. 1, viewed from the left front, with the outer cover 150 (Figs. 2 and 3) and a reinforcing plate to be described later removed. As shown in Fig. 6, on the revolving frame 31, a mount member 130 is provided. The fuel tank 36 is mounted on the mount member 130. The mount member 130 is interposed between the fuel tank 36 and the revolving frame 31 to support the fuel tank 36. The mount member 130 has a plurality of columnar members which are separated from each other in the longitudinal direction of the hydraulic excavator main body. The fuel tank 36 can be more stably mounted on the mount member 130 by increasing the distance between the plurality of members as much as possible.
The fuel tank 36 is mounted on the revolving frame 31 via the mount member 130 and a space is formed between the lower surface of the fuel tank 36 and the revolving frame 31. In this space, a hydraulic pipe connecting the hydraulic pump directly connected to the engine and the main valve 57 is disposed.
4, the fuel tank 36 is arranged in front of the exhaust treatment device 14 and behind the reducing agent tank 20. The mounting member 130 on which the fuel tank 36 is mounted is also disposed in front of the exhaust treatment device 14 and also behind the reducing agent tank 20. [
The outer cover 150 covers the mount member 130 from the side. In a state in which the outer cover 150 is mounted, the mount member 130 can not be viewed from the outside. As shown in Fig. 6, by removing the outer cover 150, the mount member 130 can be viewed from the side of the hydraulic excavator 1. Fig.
As shown in Fig. 4, a part of the fuel tank 36 is projected laterally from the side edge 31e of the revolving frame 31. As shown in Fig. On the other hand, the mount member 130 is attached to the revolving frame 31. The lower surface of the fuel tank 36 extends to the outside of the mount member 130. There is a space facing the lower surface of the fuel tank 36 on the outer side of the mount member 130. [
A cooling water pipe 17 through which cooling water flows from the engine 7 toward the reducing agent tank 20 and a cooling water pipe 18 through which the cooling water flows from the reducing agent tank 20 toward the radiator 16 extend along each other . The cooling water pipes 17 and 18 extend in the longitudinal direction of the hydraulic excavator main body. The cooling water pipes 17 and 18 extend downward from the reducing agent tank 20 along the upper surface of the revolving frame 31. The cooling water pipes 17 and 18 extend along the side edge 31e of the revolving frame 31. [ The cooling water pipes 17 and 18 extend through the outside of the hydraulic excavator body with respect to the mount member 130.
7 is a left perspective view of the hydraulic excavator 1 of FIG. 1 with the outer cover 150 removed and a reinforcing plate 140 attached thereto. Fig. 7 shows a state in which the reinforcing plate 140 is additionally attached to the hydraulic excavator 1 viewed from the lower front at the same angle as Fig. In the hydraulic excavator 1 shown in Fig. 7, two reinforcing plates 140 and 140 are attached. The reinforcing plate 140 is provided outside the cooling water pipes 17 and 18. Therefore, a part of the cooling water pipes 17 and 18 is covered by the reinforcing plate 140, so that it can not be seen from the side.
The reinforcing plate 140 is disposed at a position overlapping with the mount member 130 in the longitudinal direction of the hydraulic excavator main body. 6, two mount members 130 are arranged in the front-rear direction in the vicinity of the lateral edge 31e of the revolving frame 31. As shown in Fig. The reinforcing plate 140 shown in Fig. 7 is disposed at a position overlapping the mount member 130 when viewed from the side of the hydraulic excavator main body. The mount member 130 is covered by the reinforcing plate 140, so that it can not be seen.
8 is a perspective view of the reinforcing plate. As shown in Fig. 8, the reinforcing plate 140 has a shape obtained by bending a thin plate-like member in two portions. The reinforcing plate 140 includes flat plate portions 141, 142 and 143 and bent portions 145 between the flat plate portion 141 and the flat plate portion 142 and flat portions 142 and 143 And a curved portion 146 between the curved portions. Since the reinforcing plate 140 is bent in two portions, the strength of the reinforcing plate 140 is improved.
The flat plate portion 141 and the flat plate portion 142 are bent with the bending portion 145 as a boundary and are formed at the bending portion 145 to form an obtuse angle. The flat plate portion 142 and the flat plate portion 143 are bent with the bent portion 146 as a boundary and are connected by forming an obtuse angle in the bent portion 146. The flat plate portion 141 and the flat plate portion 143 are perpendicular to each other.
A through hole 144 is formed in the flat plate portion 143 so as to penetrate the flat plate portion 143 in the thickness direction. The bolt is inserted into the through hole 144 so that the reinforcing plate 140 is fixed to the revolving frame 31.
9 is a sectional view showing the vicinity of the outer cover from the front. As described above, the revolving frame 31 has a side edge 31e. A mount member 130 is provided on the revolving frame 31 and the fuel tank 36 is mounted on the mount member 130.
The fuel tank 36 has a lower surface 36b opposed to the revolving frame 31 with a gap therebetween and a side surface 36s protruding outward beyond the side edges 31e of the revolving frame 31. The mount member 130 is covered from the side by the outer cover 150. The mount member 130 has an outer surface 130s facing the outside of the hydraulic excavator main body. The outer cover 150 has an inner surface 150s facing the inner side of the hydraulic excavator main body.
The cooling water pipes 17 and 18 for guiding the cooling water of the engine 7 to the reducing agent tank 20 are arranged in such a manner that the side edges 31e of the revolving frame 31 and the fuel tank 36, As shown in Fig. The cooling water pipes 17 and 18 are disposed below the fuel tank 36 and disposed on the outside of the hydraulic excavator main body with respect to the mount member 130. The cooling water pipes 17, Respectively. The cooling water pipes 17 and 18 are disposed in a hollow space formed between the mount member 130 and the outer cover 150. [ The cooling water pipes 17 and 18 are disposed below the fuel tank 36 via a space sandwiched between the mount member 130 and the outer cover 150. [
The cooling water pipes 17 and 18 are disposed at positions opposed to the lower surface 36b of the fuel tank 36, the outer surface 130s of the mount member 130 and the inner surface 150s of the outer cover 150 . The cooling water pipes 17 and 18 are disposed on the outer side of the hydraulic excavator main body from the side edge 31e of the revolving frame 31 and at a position inside the hydraulic excavator main body than the side surface 36s of the fuel tank 36 . The fuel tank 36 is present above the cooling water pipes 17 and 18 and the revolving frame 31 does not exist below the cooling water pipes 17 and 18. [
The cooling water pipes 17 and 18 are arranged in the vertical direction. The cooling water pipe 17 is disposed on the upper side and the cooling water pipe 18 is disposed on the lower side and the cooling water pipes 17 and 18 are supported by the clamp member 160 in two pieces. The clamp member 160 supports the cooling water pipes 17 and 18 and positions the cooling water pipes 17 and 18.
In the revolving frame 31, a reinforcing plate 140 is fixed. The reinforcing plate 140 is provided on the outside of the hydraulic excavator body with respect to the cooling water pipes 17 and 18 and inside the hydraulic excavator body with respect to the exterior cover 150. [ The cooling water pipes 17 and 18 are sandwiched between the mounting member 130 and the reinforcing plate 140 at positions where the reinforcing plate 140 is provided.
The reinforcing plate 140 has a bent portion 145. The bending portion 145 is disposed at a position adjacent to the cooling water pipes 17 and 18 in the vertical direction. The cooling water pipes 17 and 18 shown in Fig. 9 are overlapped with the mount member 130 when the hydraulic excavator body is viewed from the side. The bent portion 145 is provided between the upper end of the cooling water pipe 17 shown in FIG. 9 and the lower end of the cooling water pipe 18.
10 is a schematic view showing the arrangement of the reinforcing plate 140 with respect to the mount member 130. Fig. Fig. 10 shows a reinforcing plate 140 viewed from the side of the hydraulic excavator main body, with the outer cover 150 removed, as in the perspective view of Fig.
In Fig. 10, the mount member 130 is disposed on the inner side of the reinforcing plate 140, and can not be directly seen. Therefore, it is shown by a broken line. On the other hand, in the longitudinal direction of the hydraulic excavator main body, the dimension of the reinforcing plate 140 is a little larger than the dimension of the mount member 130. The dimension at which the reinforcing plate 140 is extended to the position where the mount member 130 does not exist in the forward and backward directions is smaller than the dimension of the mount member 130 as shown in Fig. By thus setting the dimension of the reinforcing plate 140, the reinforcing plate 140 is provided only at a position overlapping with the mount member 130 in the front-rear direction.
11 is a side view showing the configuration of the clamp member 160. Fig. 11, the vicinity of the mount member 130 is enlarged in a state in which the outer cover 150 and the reinforcing plate 140 are removed as in the perspective view of Fig.
11, the clamp member 160 has a clamp body 161, a connecting portion 162, and a fixing portion 164. The clamp main body 161 binds the cooling water pipes 17 and 18. The fixing portion 164 is fixed to the revolving frame 31 by a bolt 166. [ The connecting portion 162 is integrally connected to the fixing portion 164 and fixes the clamp main body 161 using the bolt 163. [
The clamp member 160 supports the cooling water pipes 17 and 18 with respect to the revolving frame 31. 11, the clamp member 160 is disposed in the vicinity of the mount member 130 in the longitudinal direction of the hydraulic excavator main body.
Next, the operation and effect of the present embodiment will be described.
The hydraulic excavator 1 of the present embodiment is provided with a mount member 130 provided on the revolving frame 31 and a fuel tank 36 mounted on the mount member 130 as shown in Fig. have. The fuel tank 36 has side surfaces 36s that protrude outward beyond the lateral edges 31e of the revolving frame 31. [ The hydraulic excavator 1 further includes an outer cover 150 for covering the mount member 130 from the side, cooling water pipes 17 and 18 for guiding the cooling water of the engine 7 to the reducing agent tank 20, (140). The cooling water pipes 17 and 18 are disposed below the fuel tank 36 via a space sandwiched between the mount member 130 and the outer cover 150. [ The reinforcing plate 140 is provided on the outer side with respect to the cooling water pipes 17 and 18 and on the inner side with respect to the outer cover 150.
By arranging the cooling water pipes 17 and 18 immediately inside the outer cover 150, access to the cooling water pipes 17 and 18 is facilitated and the maintenance of the cooling water pipes 17 and 18 is facilitated. On the other hand, in the case where the cooling water pipes 17 and 18 are arranged outside the side edge 31e of the revolving frame 31, for example, when the hydraulic excavator 1 hits the outer cover 150 at the time of turning When a shock is applied to the outer cover 150, a load is applied to the cooling water pipes 17 and 18 through the deformed outer cover 150 and the cooling water pipes 17 and 18 are inserted between the outer cover 150 and the mount member 130. [ 18 may be caught.
The outer cover 150 and the reinforcing plate 140 are provided on the outer side of the cooling water pipes 17 and 18 by arranging the reinforcing plate 140 between the cooling water pipes 17 and 18 and the outer cover 150, The stiffness of the structure outside the pipes 17 and 18 is improved. Therefore, even when an impact is applied to the outer cover 150, deformation of the structure outside the cooling water pipes 17 and 18 can be suppressed, and a space for accommodating the cooling water pipes 17 and 18 can be ensured , The load exerted on the cooling water pipes (17, 18) through the outer cover (150) can be reduced.
This makes it possible to suppress the situation in which the cooling water pipes 17 and 18 are sandwiched between the cooling water pipes 17 and 18 in the space sandwiched between the mount member 130 and the outer cover 150 below the fuel tank 36. [ (17, 18) can be disposed. Therefore, the cooling water pipes 17 and 18 can be arranged efficiently.
7 and 10, the reinforcing plate 140 is provided at a position overlapping with the mount member 130 as viewed from the side.
A space is formed between the lower surface 36b of the fuel tank 36 and the revolving frame 31 because the fuel tank 36 is mounted on the mount member 130. [ The cooling water pipes 17 and 18 are connected to the fuel tank 36 and the revolving frame 31 even when an external load is applied to the external cover 150 at a position where the mounting member 130 does not exist, So that no excessive load is applied to the cooling water pipes 17, 18.
The cooling water pipes 17 and 18 are located outside the cooling water pipes 17 and 18 at positions where the mounting member 130 is provided in order to prevent the cooling water pipes 17 and 18 from being caught between the outer cover 150 and the mount member 130. [ The stiffness of the structure of Fig. Even if the reinforcing plate 140 is disposed at a position where the mounting member 130 is not provided, the effect of reducing the load applied to the cooling water pipes 17 and 18 is small. Therefore, a reinforcing plate 140 is provided at a position overlapping with the mount member 130 as viewed from the side, and the reinforcing plate 140 is not disposed at a position not overlapping the mount member 130. By doing so, the reinforcing plate 140 can be downsized while securing the necessary strength for protecting the cooling water pipes 17 and 18.
As shown in Figs. 8 and 9, the reinforcing plate 140 has a bent portion 145. Fig. The bent portion 145 is formed between the upper and lower ends of the cooling water pipes 17 and 18 which overlap the reinforcing plate 140 when seen from the side.
The rigidity of the reinforcing plate 140 can be improved by forming the reinforcing plate 140 into a shape having the bent portion 145 instead of the flat plate. Particularly, at the position where the bent portion 145 is provided, the rigidity of the reinforcing plate 140 is higher. The bending section 145 is superimposed on the position where the cooling water pipes 17 and 18 are provided in the vertical direction so that the cooling water pipes 17 and 18 can be more reliably protected .
As shown in Figs. 9 and 11, the hydraulic excavator 1 further includes a clamp member 160. As shown in Fig. The clamp member 160 supports the cooling water pipes 17 and 18 with respect to the revolving frame 31.
The clamp member 160 supports the cooling water pipes 17 and 18 and has a function of positioning the cooling water pipes 17 and 18. It is possible to prevent interference between the cooling water pipes 17 and 18 and the mount member 130 by positioning the cooling water pipes 17 and 18 by disposing the clamp member 160 in the vicinity of the mount member 130. [
It should be understood that the embodiments disclosed herein are by no means intended to be limiting in all respects. The scope of the present invention is indicated by the appended claims rather than by the foregoing description, and it is intended that all modifications within the meaning and range of equivalency of the claims are included.
