backhoe

Abstract

A shovel is provided that improves the operability of fuel supply work. The shovel has a urea water tank disposed in a space formed in front of a fuel tank, and a fuel pump disposed at a position higher than the urea water tank in the space.

Description

Technical Field

[0001] This application claims priority based on Japanese Patent Application No. 2021-059889, filed on March 31, 2021. The entire contents of that Japanese application are incorporated herein by reference.

[0002] This invention relates to an excavator. Background Technology

[0003] An excavator is disclosed in which a space is formed in front of a urea tank inside a treatment agent tank, and an oil supply pump is housed in the space (see Patent Document 1).

[0004] Patent Document 1: Japanese Patent Application Publication No. 2016-125242

[0005] Patent Document 1 discloses an excavator with an opening / closing door on its fuel tank cover for accessing the fuel pump. Furthermore, the opening / closing door is located above or in front of the fuel pump. Therefore, when using the fuel pump to supply fuel to the fuel tank, the hose connected to the fuel pump is wrapped around the opening / closing door, thus lengthening the hose. Consequently, laying and retracting the hose during fuel supply takes time, leading to decreased operability. Summary of the Invention

[0006] Therefore, in view of the above issues, the objective is to provide an excavator that improves the operability of fuel supply operations.

[0007] To achieve the above objectives, in one embodiment of the present invention, an excavator is provided, comprising: a urea tank disposed in a space formed in front of a fuel tank; and a fuel pump disposed above the urea tank in the space.

[0008] The effects of the invention

[0009] According to the above embodiments, an excavator with improved fuel supply operation operability can be provided. Attached Figure Description

[0010] Figure 1 This is a left-side view of the excavator.

[0011] Figure 2 This is a right-side view of the excavator.

[0012] Figure 3 This is a top view of the upper rotating body of the excavator.

[0013] Figure 4 This is a 3D view of the excavator viewed from the front right side.

[0014] Figure 5It is a 3D diagram of an excavator illustrating the structure inside the treatment agent tank.

[0015] Explanation of symbols

[0016] 1-Lower traveling body, 2-Upper rotating body, 19-Fuel tank, 19a-Fuel inlet, 19b-Fuel pump, 19c, 19d-Fuel hoses, 19e-Nozzle, 20-Urea water tank, 20c-Water inlet, 22-Toolbox, 40-Treatment agent tank cover, 40a-Internal space, 41-Side door, 41a-Locking part, 42-Nozzle support frame, 43-Switch box, 45-Space (accommodation part), 50-Toolbox cover. Detailed Implementation

[0017] One embodiment of the present invention will be described with reference to the accompanying drawings.

[0018] Figure 1 This is a left-side view of an excavator, which is an example of a construction machine with one implementation method.

[0019] Figure 2 This is a right-side view of the excavator.

[0020] like Figure 1 and Figure 2 As shown, the excavator has a lower traveling body 1, an upper slewing body 2, an operator's cab 3, a boom 4, a stick 5, and a bucket 6. The upper slewing body 2 is mounted on the lower traveling body 1 via a slewing mechanism (not shown). The operator's cab 3 is located on the front left side of the upper slewing body 2. One end of the boom 4 is rotatably mounted to the center of the front part of the upper slewing body 2. The stick 5 is rotatably mounted to the front end of the boom 4. The bucket 6, as an end attachment, is rotatably mounted to the front end of the stick 5. Alternatively, instead of the bucket 6 as an excavation attachment, an end attachment such as a breaker or crusher can be mounted to the front end of the stick 5.

[0021] Figure 3 This is a top view showing the general structure of the upper rotating body 2. (For example...) Figure 3 As shown, an engine compartment 7 (indicated by a dashed line) is formed at the rear of the upper rotating body 2. A diesel engine 8 is installed inside the engine compartment 7. Figure 1 As shown, an SCR system 110 (Selective Catalytic Reduction system) is arranged above the diesel engine 8. The SCR system 110 includes an exhaust gas treatment device 10 for purifying the exhaust gas discharged from the diesel engine 8. A hydraulic pump 21 is arranged below the SCR system 110. A cooling fan 12 is provided in the diesel engine 8, and a heat exchanger unit 13 including a cooler is arranged in front of the cooling fan 12.

[0022] An air purifier 63 (air filter) is disposed on the side of the heat exchanger unit 13 (the front side for the excavator). The air purifier 63 is connected to the diesel engine 8 via an intake pipe 64. Air filtered by the air purifier 63 is supplied to the diesel engine 8 through the intake pipe 64.

[0023] An exhaust pipe 9 for releasing engine exhaust (hereinafter referred to as "exhaust gas") is connected to the diesel engine 8. An exhaust gas treatment device 10 for complying with high-level exhaust gas restriction regulations is provided at the downstream end of the exhaust pipe 9. In this embodiment, the exhaust gas treatment device 10 is a NOx treatment device using a urea selective reduction method that employs an aqueous urea solution (liquid reducing agent).

[0024] The operator's cab 3 is located on the left front part of the upper rotating body 2. Here, in this specification, the front part of the upper rotating body 2 refers to the portion on the side where the boom 4 is mounted when viewed from the center of the upper rotating body 2. Furthermore, "front" refers to the direction in which the boom 4 extends when viewed from the center of the upper rotating body 2. Furthermore, "left side" refers to the portion of the upper rotating body 2 that is on the left when facing forward (in the direction of boom 4 extension). Furthermore, "right side" refers to the portion of the upper rotating body 2 that is on the right when facing forward (in the direction of boom 4 extension).

[0025] A working oil tank 120 for storing the working oil used in the hydraulic system is located behind the control room 3. The aforementioned exhaust gas treatment device 10 is located behind the working oil tank 120.

[0026] On the other hand, a fuel tank 19 for storing diesel engine fuel such as light oil is disposed at the front of the engine compartment 7. The diesel engine fuel stored in the fuel tank 19 is supplied to the diesel engine 8 via a fuel supply pipe (not shown). A urea water tank (treatment agent tank) 20 for storing the treatment agent (urea aqueous solution (liquid reducing agent)) used by the exhaust gas treatment device 10 is disposed at the front of the fuel tank 19. The treatment agent stored in the urea water tank 20 is supplied to the exhaust gas treatment device 10 via a treatment agent pump 20b located midway in the treatment agent supply pipe 20a. In addition, urea aqueous solution (liquid reducing agent) is one example of the treatment agent, but other treatment agents or other treatment methods may also be used as liquid reducing agents. The urea water tank 20 is covered by a treatment agent tank cover 40 (see reference). Figure 2 A toolbox 22 for storing working tools and machinery is located on the front side of the urea tank 20. The toolbox 22 is covered by a toolbox cover 50 (see reference). Figure 2 The tank is covered. Furthermore, a fuel pump 19b (described later) is disposed within the treatment agent tank cover 40. Also, within the treatment agent tank cover 40, a space (accommodation portion) 45 (described later) is formed on the outer side (right side) of the urea water tank 20.

[0027] The boom 4 is rotatably supported by a boom support frame 17 that is firmly fixed to the center of the front side of the slewing frame 2a of the upper slewing body 2. More specifically, the boom 4 is supported by a boom foot pin 100 that passes through the right bracket 17R, the boom 4, and the left bracket 17L when it is clamped between the right bracket 17R and the left bracket 17L of the boom support frame 17.

[0028] Next, use Figure 4 and Figure 5 The configuration structure of fuel tank 19, urea water tank 20, toolbox 22 and fuel pump 19b is further described. Figure 4 This is a 3D view of the excavator viewed from the front right side.

[0029] A fuel inlet 19a for injecting fuel into the fuel tank 19 is provided on the upper surface of the fuel tank 19. Thus, fuel can be supplied to the fuel tank 19 from the fuel inlet 19a through a fuel supply device (not shown) outside the excavator.

[0030] A cover CV is provided in front of the fuel tank 19, and a treatment agent tank cover 40 is positioned further in front of it. The upper surface of the treatment agent tank cover 40 is partially lowered, creating a height difference. This height difference forms a ladder for workers to climb to the upper rotating body 2. Furthermore, a handrail GR and a guardrail HR are provided on the upper surface of the treatment agent tank cover 40. Workers can grasp the handrail GR and guardrail HR when climbing to the upper rotating body 2. A side door 41 that can be opened and closed is provided on the right side of the treatment agent tank cover 40. The side door 41 is configured to prevent over-opening via a guide rail RA and a support bar ST. One end of the support bar ST is rotatably mounted to a plate PL, and the other end is slidably mounted to the guide rail RA. The plate PL is fixed to the rotating frame 2a. Additionally, in Figure 5 For clarity, a cross symbol is marked on the PL board.

[0031] A toolbox cover 50 is disposed in front of the treatment agent tank cover 40. A toolbox 22 is disposed inside the toolbox cover 50. The upper surface of the toolbox cover 50 is also used as part of the steps for workers to climb onto the upper rotating body 2.

[0032] Figure 5 This is a 3D view of an excavator illustrating the structure of the 40mm interior of the treatment agent tank. Additionally, in... Figure 5 The diagram shows the side door 41 in an open state. It also shows the process agent tank cover 40, toolbox cover 50, toolbox 22, boom 4, and boom foot pin 100 removed. The location of the toolbox 22 is shown in dashed lines.

[0033] An internal space 40a, covered by a treatment agent tank cover 40, is formed in front of the fuel tank 19. A urea water tank 20 is disposed within this internal space 40a. Here, the treatment agent tank cover 40 and the toolbox cover 50 serve as part of a ladder used by workers to climb onto the upper rotating body 2; therefore, the upper surface plate of the treatment agent tank cover 40 is formed to be higher than the upper surface of the treatment agent tank cover 40. Thus, within the treatment agent tank cover 40, there is space on the urea water tank 20 for arranging the fuel pump 19b, which will be described later. Furthermore, a water inlet 20c for injecting urea water into the urea water tank 20 is formed to extend upwards from the urea water tank 20.

[0034] Furthermore, the fuel tank shroud 40 houses a fuel pump 19b, fuel hoses 19c and 19d, and a nozzle 19e. The nozzle 19e is equipped with a check valve and is configured to draw in fuel. A filter may also be provided in the nozzle 19e to prevent foreign objects from being drawn into the fuel pump 19b. One end of the fuel hose 19d is connected to the nozzle 19e. The other end of the fuel hose 19d is connected to the intake port of the fuel pump 19b. One end of the fuel hose 19c is connected to the discharge port of the fuel pump 19b. The other end of the fuel pump 19b is connected to the upper side of the front wall of the fuel tank 19. By connecting the nozzle 19e to a fuel tank (not shown, for example, a cylindrical tank containing fuel) located outside the excavator and operating the fuel pump 19b, fuel can be drawn from the fuel tank and supplied to the excavator's fuel tank 19.

[0035] Fuel pump 19b is positioned higher than urea tank 20 within the internal space 40a of the treatment agent tank cover 40. Fuel pump 19b is mounted to the front outer wall of fuel tank 19 via a mounting plate. Furthermore, fuel pump 19b is positioned so as not to interfere with boom foot pin 100 when performing maintenance by pulling out boom foot pin 100 through pin hole PH in the driven boom support bracket 17 (right bracket 17R and left bracket 17L). Additionally, pin hole PH is formed at a position higher than water inlet 20c.

[0036] Furthermore, the structure described is based on the connection via fuel hose 19c when connecting from the discharge port of fuel pump 19b to fuel tank 19, but it is not limited to this and may also be based on the connection via piping fitting.

[0037] Furthermore, within the internal space 40a of the treatment agent tank cover 40, a space 45 is located further outward (to the right) than the urea tank 20. Specifically, space 45 is located between the right side wall of the urea tank 20 and the side door 41 of the treatment agent tank cover 40. Space 45 accommodates the fuel hose 19d and nozzle 19e extending from the fuel pump 19b. Specifically, a baffle DP is disposed between the fuel hose 19d and the urea tank 20. The baffle DP is box-shaped to accommodate a portion of the fuel hose 19d. Figure 5 For clarity, the box-shaped partition DP is marked with diagonal lines, and a portion of the fuel hose 19d housed within the box-shaped partition DP is shown in dashed lines.

[0038] A nozzle support 42 is provided in space 45 to hold the nozzle 19e when the fuel hose 19d and nozzle 19e are housed within the treatment agent canister 40. Figure 5 In this example, the nozzle support 42 has an opening extending through in the vertical direction, and the nozzle 19e is held in place by inserting the nozzle 19e into the opening. Thus, for example, when the upper rotating body 2 rotates, movement of the nozzle 19e within the space 45 can be suppressed.

[0039] Space 45 contains a switch box (operation unit) 43 that indicates the operation of fuel pump 19b. The signal of switch box 43 is connected to the excavator's controller (not shown). For example, if switch box 43 is turned on, the controller causes fuel pump 19b to operate and begin fuel supply. The controller monitors the level gauge of fuel tank 19, and if the level gauge value exceeds a predetermined threshold, it can stop fuel pump 19b and terminate fuel supply.

[0040] A locking part 41a is provided on the side door 41. Furthermore, the locking part 41a can close the locking part (not shown) of the toolbox cover 50 to the side door 41.

[0041] According to the excavator of this embodiment, by arranging the fuel pump 19b inside the treatment agent tank cover 40 and above the urea water tank 20, the length of the fuel hose 19c can be shortened compared to a structure where the fuel pump is arranged in front of the urea water tank 20. This reduces the number of brackets and the like used to secure the fuel hose 19c. Furthermore, shortening the hose length helps suppress a decrease in fuel supply speed. Additionally, the volume of the toolbox 22 located in front of the urea water tank 20 can be increased.

[0042] Furthermore, according to the excavator of this embodiment, a side door 41 can be provided on the side of the treatment agent tank cover 40, and the fuel hose 19d and nozzle 19e can be housed in the space 45. Therefore, when refueling from a refueling tank (not shown), the operator can open the side door 41 while standing on the ground without climbing onto the excavator, remove the nozzle 19e from the nozzle support 42, and take the nozzle 19e and fuel hose 19d out of the internal space 40a of the treatment agent tank cover 40. Furthermore, the operator can operate the switch box 43 while standing on the ground without climbing onto the excavator. This improves the operability of fuel supply operations using the fuel pump 19b. Moreover, since the configuration can reduce bending and twisting of the fuel hose 19d during fuel supply, the decrease in fuel supply speed can be suppressed.

Claims

1. An excavator, comprising: The urea tank cover is located in front of the fuel tank; A urea tank is disposed within an internal space formed by the urea tank cover; A fuel pump is disposed within the internal space and positioned above the urea tank. A receiving section is disposed within the internal space and positioned further outward in the lateral direction than the urea tank, for accommodating the fuel hose connected to the fuel pump; A nozzle support bracket is disposed within the internal space and positioned further outward in the lateral direction than the urea tank, and maintains connection to the end of the fuel hose for the nozzle. as well as A side door is located on the outer side of the urea tank cover in the side direction, and is capable of being opened and closed. By opening the side door, the operator can remove the nozzle from the nozzle support while standing on the ground, and remove the nozzle and the fuel hose from the interior space of the urea tank cover.

2. The excavator according to claim 1, wherein, It also includes an operating unit disposed within the internal space, positioned further outward in the side direction than the urea tank, and instructing the fuel pump to operate. By opening the side door, the operator can operate the control unit while standing on the ground.

3. The excavator according to claim 1 or 2, wherein, It has a toolbox cover located in front of the urea tank cover. The side door has a locking part that engages with the toolbox cover.

4. The excavator according to any one of claims 1 to 3, wherein, The fuel pump is positioned so as not to interfere when the boom foot pin is pulled out of the pin hole.

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