Construction machinery

Abstract

To provide an electrically controlled construction machinery capable of simplifying the wiring of a wiring harness between a controller and a control valve.SOLUTION: On a swivel frame 7 of an excavation work machine 1, a hydraulic oil tank 48 is placed at the center of the right engine room 9a in a front-rear direction. A control valve 45 is placed in front of the hydraulic oil tank 48, and a battery 49 is placed in further front of the control valve 45. A cooling mechanism 60 is placed behind the hydraulic oil tank 48. A controller 51 that outputs signals for driving the control valve 45 is placed opposing the hydraulic oil tank 48.SELECTED DRAWING: Figure 4

Description

Technical Field

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[0001] The present invention relates to a construction machine for electrically controlling a control valve that controls the direction and flow rate of hydraulic oil supplied to, for example, a hydraulic actuator.

Background Art

[0002] Conventionally, for example, a construction machine such as an excavation work machine includes devices such as an engine, a work device, and a traveling device, and further includes a controller corresponding to each device in order to electrically control the operations of these devices. The controller operates each device by sending an output signal corresponding to an input signal from an operation unit to a power unit such as a control valve. Such a controller is equipped with electronic devices such as a processor that performs arithmetic processing. Therefore, the controller is arranged in a place where it is not affected by heat and can be protected from vibrations, impacts, etc. (see, for example, Patent Document 1).

[0003] Patent Document 1 discloses a configuration in which a controller is arranged on the back surface of a horizontal plate that reinforces a support bracket that supports the base end portion of a front work machine in a swing frame.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] Electrical components mounted on construction machinery, such as controllers, are interconnected with the power-operating mechanical parts via wire harnesses, which consist of power supply lines and signal communication lines. Furthermore, in construction machinery equipped with multiple hydraulic devices that operate hydraulically, electromagnetic control valves are used to adjust the flow direction and flow rate of the hydraulic fluid, and the operation of these control valves is electrically controlled by the controller. In such electrically controlled construction machinery, where the operation of hydraulic devices is electrically controlled, the routing of wire harnesses can be difficult due to the layout of each mechanical part in the slewing frame. For example, in the arrangement configuration disclosed in Patent Document 1, the area around where the controller is located is a space where control valves cannot be placed. Therefore, the control valves must be placed far from the controller, which increases the difficulty of routing the wire harnesses.

[0006] Furthermore, the controller that outputs an electrical signal to the control valve needs to receive a pressure signal from the hydraulic pump that discharges pressurized oil toward the control valve. Because the controller transmits and receives signals between multiple devices, multiple wire harnesses must be routed from a single controller, taking into account the relative positions of each device. Therefore, it is desirable that the controller be installed in a location that facilitates the routing of wire harnesses from multiple devices.

[0007] This invention has been made in view of the above-mentioned problems, and aims to provide a construction machine that can easily route the wire harness between the controller and the control valve. [Means for solving the problem]

[0008] The construction machine according to the present invention is characterized in that, on the vehicle frame, a hydraulic oil tank for storing hydraulic oil discharged by a hydraulic pump driven by a prime mover, and control valves for controlling the flow direction and flow rate of hydraulic oil to a plurality of hydraulic actuators operated by the hydraulic oil discharged from the hydraulic pump, the machine is further equipped with a controller that outputs signals to control the control valves, and the controller is positioned opposite the hydraulic oil tank.

[0009] Another aspect of the present invention relates to a construction machine in which the controller is positioned in front of the rear of the hydraulic oil tank.

[0010] Another aspect of the present invention relates to a construction machine in which the hydraulic oil tank is located on one side of the vehicle frame, and the controller is located inside the side of the hydraulic oil tank that faces outward from the vehicle frame.

[0011] Another aspect of the present invention relates to a construction machine in which the control valve is located in front of the hydraulic oil tank, and the controller is located between the control valve and the hydraulic oil tank.

[0012] Another aspect of the present invention relates to a construction machine in which the controller is located to the side of the hydraulic oil tank.

[0013] Another aspect of the present invention relates to a construction machine in which the controller is supported by the hydraulic oil tank.

[0014] In another aspect of the present invention, a construction machine is provided on the vehicle frame, wherein a partition plate is provided to separate the hydraulic oil tank from the control valve, and the controller is supported by the partition plate.

[0015] In a construction machine according to another aspect of the present invention, in the construction machine, a driver's seat is disposed on the other left and right side of the vehicle body frame, and the controller is supported by a wall portion on the driver's seat side facing the hydraulic oil tank.

Advantages of the Invention

[0016] According to the present invention, in an electrically controlled construction machine, it is possible to simplify the routing of the wire harness between the controller and the control valve.

Brief Description of the Drawings

[0017] [Figure 1] It is a right side view of an excavation work machine according to an embodiment of the present invention. [Figure 2] It is a block diagram for explaining a hydraulic system of an excavation work machine according to an embodiment of the present invention. [Figure 3] It is a perspective view from the right front showing the layout of each component on a swing frame according to an embodiment of the present invention. [Figure 4] It is a plan view showing the arrangement of a controller according to a first embodiment of the present invention. [Figure 5] It is a partial perspective view showing an enlarged view of the vicinity of a controller according to a first embodiment of the present invention. [Figure 6] It is a plan view showing the arrangement of a controller according to a second embodiment of the present invention. [Figure 7] It is a partial perspective view showing an enlarged view of the vicinity of a controller according to a second embodiment of the present invention. [Figure 8] It is a plan view showing the arrangement of a controller according to a third embodiment of the present invention. [Figure 9] It is a partial perspective view showing an enlarged view of the vicinity of a controller according to a third embodiment of the present invention.

Modes for Carrying Out the Invention

[0018] The present invention relates to a construction machine that controls the operation of a control valve for adjusting the flow direction and flow rate of hydraulic oil pumped toward each of a plurality of hydraulic actuators by an electric signal. By devising the arrangement of the controller, the wiring of the wire harness between the controller and the devices connected to the controller is facilitated. Hereinafter, embodiments of the present invention will be described with reference to the drawings.

[0019] In an embodiment of the present invention, as a construction machine according to the present invention, an excavation work machine (excavator) which is a swing work vehicle will be described as an example. However, the construction machine according to the present invention is not limited to an excavation work machine, and can be widely applied to other construction machines such as a bulldozer, a crane work machine, a compact track loader, a skid steer loader, a wheel loader, etc.

[0020] [Overall Configuration of Excavation Work Machine]<00001' >The overall configuration of the excavation work machine 1 according to the present embodiment will be described with reference to FIG. 1. Hereinafter, unless otherwise specified, based on the position of the operator seated in the driver's seat of the excavation work machine 1, it is referred to as "front side", "rear side", "left and right sides", "plane side" or "upper side", "bottom side" or "lower side". As shown in FIG. 1, the excavation work machine 1 is a so-called ultra-mini swing type excavator, and includes a self-propelled traveling vehicle body 2, an excavation device 3 and an earth discharge device 4 as a working part attached to the traveling vehicle body 2.

[0021] The excavation work machine 1 has a pair of left and right crawler type traveling parts 5, 5, a track frame 6 as a base for supporting the left and right traveling parts 5, 5, and a swing frame 7 provided on the track frame 6.

[0022] The traveling part 5 has a configuration in which a crawler is wound around a rotating body such as a plurality of sprockets supported by a predetermined frame part constituting the track frame 6. The traveling part 5 has a drive sprocket 5a as a rotating body at the rear end. The track frame 6 has a center frame part 6a located between the left and right traveling parts 5, 5, and side frame parts 6b provided on both the left and right sides of the center frame part 6a. It should be noted that there seems to be a small error in the number in the " " you provided. I translated it as "<00001' >" according to the original text. If this is not what you want, please correct it and let me know.

[0023] The left and right travel sections 5, 5 are driven by a pair of left and right hydraulic motors 44, 44. The hydraulic motors 44 are hydraulic actuators that are driven by the supply of hydraulic fluid. The hydraulic motors 44 are installed in each travel section 5, attached to predetermined locations such as the side frame section 6b of the track frame 6, and rotate the drive sprocket 5a. The left and right hydraulic motors 44, 44 each drive the travel section 5, enabling the excavator 1 to travel straight forward and backward, and to turn left and right.

[0024] A soil removal device 4 is attached to the front of the track frame 6. The soil removal device 4 has a pair of support frames 4a that extend in the front-rear direction between the left and right running sections 5, 5, and a blade 4b that serves as a soil removal plate provided at the tip of the support frames 4a. The soil removal device 4 is provided so as to be able to move up and down by a blade cylinder provided between the support frames 4a and the track frame 6.

[0025] The slewing frame 7 is configured to be approximately circular in plan view and is mounted relative to the track frame 6 so as to be able to slewing in either the left or right direction around its vertical axis. A slewing device is provided on the upper side of the track frame 6, which includes a slewing bearing 6c and a slewing hydraulic motor (not shown). The slewing hydraulic motor is a hydraulic actuator driven by the supply of hydraulic fluid, and rotates the slewing frame 7 via the slewing bearing 6c.

[0026] An operating section 11 is provided on the slewing frame 7. The operating section 11 is for operating the vehicle body 2, the excavation device 3, and the soil removal device 4, and is located inside a cabin 10 provided on the slewing frame 7. The cabin 10 has a frame that forms its outer shape and multiple window sections made of transparent material such as glass, and is generally constructed in a box shape. A door is provided on the left side of the cabin 10, which serves as an entrance and exit for the operator to the operating section 11.

[0027] In the driver's unit 11, a driver's seat support base 14, which is a seat mount, is provided on the rear side of the floor, and the driver's seat 15 is provided on the driver's seat support base 14 (see Figure 3). The driver's unit 11 is equipped with, for example, a pair of left and right travel levers extending upward from the floor, and operation pedals for work, etc., which are arranged on the floor. In addition, in the driver's unit 11, around the driver's seat 15, there is an operation panel section with various operation parts such as work operation levers and switches for operating the work unit (excavation device 3 or soil removal device 4). The work operation levers that make up the work unit are also called electric joysticks and output electrical signals according to the amount of operation by the operator.

[0028] Furthermore, an engine room 9, in which the engine and other components are covered by a bonnet, is provided on the slewing frame 7. The engine room 9 includes a right engine room 9a located on the right side of the slewing frame 7 and a rear engine room 9b located at the rear.

[0029] A counterweight 7a is provided at the lower rear of the slewing frame 7. The slewing frame 7 also includes a right bonnet 16 and a rear bonnet 17 as exterior covers.

[0030] The right bonnet 16 has a right front side cover portion 16a, a right rear side cover portion 16b, and a top cover portion 16c, and covers the right engine compartment 9a on the right side of the slewing frame 7. The right rear side cover portion 16b has a ventilation opening that allows air to circulate between the inside and outside of the engine compartment 9. The right front side cover portion 16a, the right rear side cover portion 16b, and the top cover portion 16c are connected via a connecting member. The left side of the top cover portion 16c is rotatably supported by a hinge portion, so that the right front side cover portion 16a, the right rear side cover portion 16b, and the top cover portion 16c can be opened and closed integrally in the vertical direction. The right bonnet 16 may also be configured so that the right front side cover portion 16a, the right rear side cover portion 16b, and the top cover portion 16c can be opened and closed or removed individually. Furthermore, a bulkhead 18 is provided on the left side of the right engine room 9a, and the space between the bulkhead 18 and the cabin 10 is the movement area of ​​the boom 21 of the excavation device 3, which will be described later.

[0031] The rear bonnet 17 is located above the counterweight 7a and, together with the counterweight 7a, covers the rear engine compartment 9b behind the slewing frame 7. The rear bonnet 17 is designed to be openable and closable by being rotatably supported on one side by a hinge.

[0032] The drilling device 3 is a front working device installed on the front side of the drilling machine 1. A boom support section 19 is provided on the front side of the slewing frame 7, between the right engine room 9a and the cabin 10, which rotatably supports the base of the drilling device 3.

[0033] The boom support section 19 includes a pivot shaft 19a that is installed between the bulkhead 18 on the right engine room 9a side and the wall 13 on the cabin 10 side and pivotally supports the base of the boom 21 (described later), and a cylinder bracket 19b that rotatably supports the cylinder-side end of the boom cylinder 26 (described later) (see Figure 4). The cylinder bracket 19b has a configuration in which a support shaft 19c parallel to the pivot shaft 19a is installed on a pair of support plates projecting upward from the slewing frame 7. The bulkhead 18 on the right engine room 9a side includes a plate member 18a that has the same height as the hydraulic oil tank 48 and constitutes the left side of the right engine room 9a, and a rib section 18b (see Figure 6) that extends in the front-rear direction with the left-right direction as the plate thickness direction and is also a reinforcing member of the slewing frame 7. The wall 13 on the cabin 10 side is also a reinforcing member of the slewing frame 7 that extends in the front-rear direction with the left-right direction as the plate thickness direction, similar to the rib section 18b.

[0034] The drilling device 3 comprises a boom 21 that forms the base portion of the drilling device 3, an arm 22 connected to the tip of the boom 21, and a bucket 23 attached to the tip of the arm 22. The boom 21 is composed of a first boom 21a, a second boom 21b, and a third boom 21c.

[0035] The first boom 21a has a shape in which the tip is bent forward at an obtuse angle when viewed from the side, and its base end is supported by a boom support portion 19 provided on the slewing frame 7 (see Figure 3). The base end of the first boom 21a is pivotally supported by a pivot shaft 19a (see Figure 4) whose axis is oriented in the left-right direction, so that the boom 21 is supported so that it can swing up and down relative to the slewing frame 7.

[0036] The second boom 21b is supported at its base so as to be able to swing from side to side at the tip of the first boom 21a.

[0037] The third boom 21c has a roughly triangular shape in side view and is supported at the tip of the second boom 21b so as to be able to swing from side to side. The first boom 21a and the third boom 21c are connected to each other by an offset link 24 provided parallel to the second boom 21b. The first boom 21a, the second boom 21b, the third boom 21c and the offset link 24 are connected to form a parallelogram linkage mechanism.

[0038] The excavation device 3 includes a boom cylinder 26 for rotating the first boom 21a, an offset cylinder 27 for rotating the second boom 21b and the offset link 24, an arm cylinder 28 for rotating the arm 22, and a work tool cylinder 29 for rotating the bucket 23. All of these cylinders are hydraulic cylinders. Depending on the work to be done, other devices such as a grapple or breaker may be attached to the excavation device 3 instead of the bucket 23.

[0039] The boom cylinder 26 is mounted on the front side of the first boom 21a along the length of the first boom 21a. The base end (cylinder-side end) of the boom cylinder 26 is rotatably supported on the support shaft 19c of the cylinder bracket 19b (see Figure 3). As the boom cylinder 26 extends and retracts, the first boom 21a swings around the pivot shaft 19a.

[0040] The offset cylinder 27 is positioned along the length of the left side of the second boom 21b. The rod end of the offset cylinder 27 is rotatably connected to the left side of the third boom 21c via a bracket. The cylinder end of the offset cylinder 27 is rotatably connected to a bracket protruding from the left side of the base end of the second boom 21b. As the offset cylinder 27 extends and retracts, the second boom 21b and the offset link 24 swing from side to side.

[0041] The arm cylinder 28 is rotatably supported on the third boom 21c at the cylinder side, and its rod end is rotatably supported on a bracket portion 37 provided on the base end side of the arm 22. The arm 22 swings around the connecting axis between the arm 22 and the third boom 21c, with the left-right direction being the axial direction, as the arm cylinder 28 extends and retracts.

[0042] The work tool cylinder 29 is provided along the length of the arm 22, with the cylinder side rotatably supported by a bracket portion 37 provided on the base end side of the arm 22, and the rod side end rotatably supported by a bracket portion 38 on the bucket 23 side. The bucket 23 swings around the connecting axis between the bucket 23 and the arm 22, with the left-right direction as the work tool cylinder 29 extends and retracts.

[0043] In the excavation machine 1 having the above configuration, the desired movements and operations are performed by an operator seated in the driver's seat 15, who appropriately operates the travel lever, work operation lever, etc. Specifically, for example, by operating the travel lever, the excavation machine 1 can travel straight forward and backward or turn left and right. In addition, by operating the work operation lever, excavation work is performed by the excavation device 3, or soil removal work and / or leveling work is performed by the soil removal device 4.

[0044] [Hydraulic System] The excavation work machine 1 according to this embodiment is a construction machine that controls the operation of multiple hydraulic actuators by electrical control. Figure 2 shows a block diagram of a part of the electrically controlled hydraulic system of the excavation work machine 1. In Figure 2, actuator 43 refers to any one of the various hydraulic actuators such as the blade cylinder, boom cylinder 26, offset cylinder 27, arm cylinder 28, work tool cylinder 29, travel hydraulic motor 44, and slewing hydraulic motor.

[0045] The engine 46 is configured, for example, as a diesel engine and is installed in the rear engine compartment 9b located at the rear of the swing frame 7, oriented transversely with the axial direction of the drive shaft roughly in the left-right direction. The engine 46 is the power source for the hydraulic pump 41 (main pump) and the pilot pump 42, and the hydraulic pump 41 and the pilot pump 42 are mechanically connected to the engine 46.

[0046] The hydraulic pump 41 supplies hydraulic fluid from the hydraulic fluid tank 48 to the actuator 43 via the directional control valve 45a of the control valve 45, which will be described later. The hydraulic pump 41 and the directional control valve 45a are connected by a supply pipe 61. The supply pipe 61 is equipped with a pressure sensor 63 for detecting the discharge pressure of the hydraulic fluid discharged from the hydraulic pump 41. The detection signal from the pressure sensor 63 is input to the controller 51 via a communication line.

[0047] The pilot pump 42 is for supplying pilot pressure to the directional control valve 45a via the solenoid proportional valve 45b of the control valve 45. The pilot pump 42 and the solenoid proportional valve 45b are connected by a pilot pressure supply pipe 62.

[0048] The control valve 45 is configured to control the flow direction and flow rate of the hydraulic fluid in the hydraulic system. In this embodiment, the control valve 45 selectively supplies hydraulic fluid discharged from the hydraulic pump 41 to one or more of the blade cylinder, boom cylinder 26, offset cylinder 27, arm cylinder 28, work tool cylinder 29, left and right travel hydraulic motors 44, and slewing hydraulic motor. For this reason, in an actual hydraulic system, the control valve 45 is configured as a valve unit including a directional control valve 45a and an electromagnetic proportional valve 45b corresponding to each of the multiple actuators 43.

[0049] The directional control valve 45a is a pilot-operated directional control valve, and is configured, for example, as a 4-port, 3-position hydraulic pilot-operated directional control valve. The directional control valve 45a is provided with multiple ports for connecting hydraulic piping consisting of tubes or the like. Each port is connected to a supply pipe 61, which is the discharge line of the hydraulic pump 41; a supply / discharge pipe 65, which is the supply line of hydraulics to the actuator 43 or the discharge line from the actuator 43; and a return pipe 66, which is the return line to the hydraulic oil tank 48.

[0050] A current corresponding to the amount of operation of the operating device 47 is output from the controller 51 to the electromagnetic proportional valve 45b, and the electromagnetic proportional valve 45b slides the spigot of the directional control valve 45a by outputting a pilot pressure proportional to the input current to the input port of the directional control valve 45a.

[0051] The operating device 47 refers to the operating device that corresponds to each actuator 43 among the various operating devices provided on the driver's unit 11, such as the travel lever, the operation pedal for work, and the operation lever for work.

[0052] The operation of the control valve 45 is controlled by the controller 51. The controller 51, also called an ECU (Electronic Control Unit), consists of a computer device including an arithmetic unit and memory, and a communication module, etc. The controller 51 receives an electrical signal corresponding to the operator's operation from one operating device 47 corresponding to one actuator 43, and outputs a command signal based on this signal to the electromagnetic proportional valve 45b. This adjusts the pilot pressure supplied from the electromagnetic proportional valve 45b to the directional control valve 45a, thereby controlling the flow direction and flow rate of the hydraulic fluid by the directional control valve 45a.

[0053] In a hydraulic system with the above configuration, the operation of the drilling device 3 and the rotation of the slewing frame 7 are controlled by the supply of hydraulic fluid to the actuator 43 via the control valve 45.

[0054] [Layout of each component on the swivel frame] Referring to Figure 3, the layout of each component on the slewing frame 7 will be explained in more detail, particularly the components located in the right engine compartment 9a. Note that Figure 3 shows the cabin 10 and exterior covers (right bonnet 16 and rear bonnet 17) removed.

[0055] The right engine room 9a is a compartment located on one side (right side) of the aircraft that houses the hydraulic oil tank 48, control valve 45, battery 49, and cooling mechanism 60. The cockpit 15 is located on the other side (left side) of the aircraft.

[0056] The hydraulic oil tank 48 has a roughly rectangular prism shape with a right side wall 48a, a left side wall 48b, a rear side wall 48c, and a front side wall 48d (see Figure 4). Because the hydraulic oil tank 48 is heavier than other components such as the control valve 45 and battery 49 due to the weight of the hydraulic oil it stores, it is positioned in the center in the front-rear direction of the right engine compartment 9a, taking into consideration the weight balance on the slewing frame 7. By being located in the right engine compartment 9a, the hydraulic oil tank 48 is positioned on one side (right side) of the slewing frame 7.

[0057] The cooling mechanism 60 includes a radiator for cooling the coolant of the engine 46, an oil cooler for cooling the hydraulic oil, and a cooling fan. In this embodiment, since the engine 46 is located at the rear of the swing frame 7, the cooling mechanism 60 is located near the engine 46, behind the hydraulic oil tank 48.

[0058] The control valve 45 is located in front of the hydraulic oil tank 48. The control valve 45 is supported vertically by a support member 52. The support member 52 consists of a bottom plate portion 52a and a back plate portion 52b erected on the bottom plate portion 52a. The bottom plate portion 52a and the back plate portion 52b are formed by bending sheet metal into a roughly L-shape when viewed from the side, and the back plate portion 52b covers the back side of the control valve 45.

[0059] In a plan view (see Figure 4), the control valve 45 is offset toward the partition wall 18 from the side opposite to the right front side cover portion 16a of the hydraulic oil tank 48 (right side wall portion 48a) (left side wall portion 48b). In other words, the control valve 45 is positioned further inward from the pivot frame 7 so that its entire body fits within the approximately circular outer shape of the pivot frame 7 in the left-right width direction of the hydraulic oil tank 48, and so that the supply and discharge piping 65 to each directional control valve 45a can be easily connected.

[0060] A battery 49 is positioned in front of the control valve 45. The battery 49 is fixed to the front portion of the bottom plate 52a of the support member 52.

[0061] As described above, in the right engine compartment 9a, which is covered by the right bonnet 16 on the right side of the slewing frame 7, the hydraulic oil tank 48 is located in the center in the front-to-rear direction. In the right engine compartment 9a, a control valve 45 is located in front of the hydraulic oil tank 48, a battery 49 is located in front of the control valve 45, and a cooling mechanism 60 is located behind the hydraulic oil tank 48.

[0062] Furthermore, this arrangement of the hydraulic oil tank 48, control valve 45, and battery 49 ensures that there is ample space in front of the control valve 45 and above the battery 49 for easy connection of hydraulic piping (supply piping 61, supply / discharge piping 65, return piping 66, etc.) to each directional control valve 45a. The multiple hydraulic pipes connected to the control valve 45 do not physically interfere with each other, and do not hinder maintenance work on the battery 49.

[0063] Next, we will further explain the placement of the controller 51.

[0064] The controller 51 supplies a control signal (a current of a predetermined magnitude) to the electromagnetic proportional valve 45b of the control valve 45 via a wire harness, and has a thin, roughly rectangular parallelepiped shape. In other words, the casing of the controller 51 has an outer shape that is roughly rectangular. The controller 51 and the control valve 45 are electrically connected by a wire harness (not shown) which is a power supply line and a signal communication line.

[0065] It is preferable to fix the controller 51 to a flat surface so that the controller itself does not move even if, for example, a tensile load is applied to the connected wire harness. Therefore, from the viewpoint of securing a mounting surface for the controller 51, it is positioned adjacent to the hydraulic oil tank 48, which has a box shape with a flat surface on its outer periphery wall, so as to face it.

[0066] Furthermore, the controller 51 is an electronic device and is required to be positioned in a location that is less susceptible to external shocks. In the right engine compartment 9a, the controller 51 is mounted in a position that is inside the side of the hydraulic oil tank 48 facing the right front side cover portion 16a of the right bonnet 16 (right side wall portion 48a), that is, in the area surrounding the adjacent hydraulic oil tank 48, and sufficiently far from the exterior cover. This makes it possible to avoid direct impact on the controller 51 even if, for example, the right bonnet 16 is subjected to a lateral impact.

[0067] Furthermore, the controller 51 may communicate with other equipment via a wire harness, such as obtaining the pressure value of the hydraulic fluid discharged from the hydraulic pump 41 from the pressure sensor 63 when generating control signals. For this reason, when routing the wire harness to the controller 51, the routing path is provided along the members that make up the frame structure of the slewing frame 7 inside the machine body, away from the outer cover. This prevents the wire harness from being damaged by external forces.

[0068] The specific arrangement of the controller 51 will be described below with reference to Figures 4 to 9.

[0069] [First Embodiment] The arrangement structure of the controller 51 according to the first embodiment will be described with reference to Figures 4 and 5.

[0070] In the first embodiment, as shown in the plan view of Figure 4, the controller 51 is positioned between the control valve 45 and the hydraulic oil tank 48. Specifically, the controller 51 is attached to the back plate portion 52b of the support member 52 that supports the control valve 45 (see Figure 5). By fixing the controller 51 to the rearward-facing back surface of the back plate portion 52b with screws or the like, the controller 51 is positioned between the control valve 45 and the hydraulic oil tank 48.

[0071] In the first embodiment, as shown in Figure 5, the controller 51 is positioned on the back plate portion 52b of the support member 52, close to the control valve 45, back to back with the control valve 45. The back plate portion 52b of the support member 52 is a partition plate that separates the area where the front control valve 45 is located from the area where the rear hydraulic oil tank 48 is located on the slewing frame 7, and is positioned between the hydraulic oil tank 48 and the control valve 45. In this embodiment, by positioning the controller 51 on the partition plate, the distance between the control valve 45 and the controller 51 can be reduced, simplifying the routing of the wire harness. Furthermore, by providing a hole in the back plate portion 52b of the support member 52 through which the wire harness can be inserted, it is also possible to shorten the routing path of the wire harness.

[0072] In this first embodiment, the controller 51 is attached to the back plate portion 52b of the support member 52 of the control valve 45, which is located in front of the hydraulic oil tank 48. However, the controller 51 may also be attached to the front wall portion 48d of the hydraulic oil tank 48, which faces the back plate portion 52b, via a mounting member such as a holder that holds the controller 51.

[0073] [Second Embodiment] The arrangement structure of the controller 51 according to the second embodiment will be described with reference to Figures 6 and 7.

[0074] In the second embodiment, as shown in the plan view of Figure 6, the controller 51 is positioned in the gap between the hydraulic oil tank 48 and the bulkhead 18. Specifically, the controller 51 is fixed to the plate member 18a of the bulkhead 18 by screw fastening or the like (see Figure 7). Here, the hydraulic oil tank 48 is positioned in the center of the right engine compartment 9a in the front-rear direction, and the controller 51 is attached to the bulkhead 18 adjacent to the left side of the hydraulic oil tank 48. In other words, the controller 51 is positioned midway between the control valve 45, which is in front of the hydraulic oil tank 48, and the engine 46, which is behind the hydraulic oil tank 48. Thus, in this embodiment, the controller 51 extends in the front-rear direction in a plan view, with the plate thickness direction being the left-right direction, so as to face the outer surface of the slewing frame 7 on the slewing frame 7. The controller 51 is supported by the bulkhead 18, which is a bulkhead that defines the area housing the hydraulic oil tank 48 and the control valve 45. This simplifies the routing of wire harnesses to both the control valve 45 and the engine 46 (pressure sensor 63).

[0075] Furthermore, the bulkhead 18 includes not only a plate member 18a that covers the area up to the height of one side end of the upper cover portion 16c of the right bonnet 16, but also a rib portion 18b that is a reinforcing member of the slewing frame 7. In other words, the controller 51 may be attached to the rib portion 18b. The controller 51 can be positioned on the left side of the right engine room 9a, with its height and fore-aft position changed, relative to the member that functions as a bulkhead separating the movement area of ​​the boom 21 from the right engine room 9a.

[0076] [Third Embodiment] The arrangement structure of the controller 51 according to the third embodiment will be described with reference to Figures 8 and 9. Note that in the partially enlarged view of Figure 9, the upper part of the plate member 18a in the partition wall 18 is omitted for the sake of explanation.

[0077] In the third embodiment, the controller 51 is positioned in the gap between the hydraulic oil tank 48 and the partition wall 18 in a plan view, which is the same as in the second embodiment. However, it differs from the second embodiment in that it is positioned on the left side wall portion 48b of the hydraulic oil tank 48.

[0078] The left side wall portion 48b of the hydraulic oil tank 48 is located in front of the rear side (rear side wall portion 48c) of the hydraulic oil tank 48, and its surface is flat. Furthermore, the left side wall portion 48b of the hydraulic oil tank 48 is located midway between the hydraulic oil tank 48 and the engine 46, which is located behind the hydraulic oil tank 48. In the third embodiment, by positioning the controller 51 on the side of the hydraulic oil tank 48 facing inward from the swing frame 7, it is possible to easily route the control valve 45 in front of the hydraulic oil tank 48 and the wire harness to the rear of the hydraulic oil tank 48 from the controller 51.

[0079] When positioning the controller 51 on the wall of the hydraulic oil tank 48, a mounting member (not shown) is interposed between the controller 51 and the wall of the hydraulic oil tank 48 to prevent the controller 51 from coming into close contact with the hydraulic oil tank 48. In other words, the controller 51 is positioned opposite the wall of the hydraulic oil tank 48 at a predetermined distance apart.

[0080] According to the excavation work machine 1 of this embodiment, which has the above configuration, the wiring harness between the controller 51 and the equipment electrically controlled by the controller 51 can be easily routed.

[0081] In the first to third embodiments, the excavation work machine 1 is equipped with a hydraulic system that controls the flow direction and flow rate of the hydraulic fluid in the control valve 45 based on an electrical signal input from the operating device 47, and the controller 51 is positioned opposite the hydraulic fluid tank 48. Here, "positioned opposite" means not only that the controller 51 is positioned opposite the hydraulic fluid tank 48 by being positioned on other components arranged around the hydraulic fluid tank 48 in an adjacent position (first and second embodiments), but also that the controller 51 is positioned at a predetermined distance from the hydraulic fluid tank 48 by mounting members including holders and spacers that allow the controller 51 to be attached to the hydraulic fluid tank 48 (third embodiment). With such a configuration, the routing of wire harnesses to the configuration that is communicatively connected to the controller 51 can be simplified.

[0082] Furthermore, in the first to third embodiments, the controller 51 is positioned in front of the rear wall portion 48c of the hydraulic oil tank 48 in the front-rear direction of the slewing frame 7. With this configuration, the wiring harness between the controller 51 and the control valve 45 can be easily routed in both the front and rear directions of the hydraulic oil tank 48.

[0083] Furthermore, in the first embodiment, the controller 51 is positioned between the hydraulic oil tank 48 and the control valve 45. With this configuration, the gaps between the members of the right engine compartment 9a can be effectively utilized, and the wiring harness between the controller 51 and the control valve 45 can be easily routed.

[0084] Furthermore, in the second embodiment, the right engine compartment 9a is provided on the right side of the vehicle body frame (swing frame 7), and the driver's seat 15 is located on the left side. The controller 51 is supported on the wall (bulkhead 18) on the driver's seat 15 side, which faces the hydraulic oil tank 53. This configuration allows for easy routing of the wire harness between the controller 51 and the control valve 45 while effectively utilizing the gaps between the members of the right engine compartment 9a.

[0085] Furthermore, in the second and third embodiments, the controller 51 is positioned to the side of the hydraulic oil tank 48. As shown in the plan views of Figures 6 and 8, the hydraulic oil tank 48 is positioned in the right engine compartment 9a, spaced apart from the bulkhead 18, creating a space between the left side wall 48b of the hydraulic oil tank 48 and the bulkhead 18. By making effective use of this space, the controller 51 can be positioned in a location that facilitates the routing of the wire harness to the control valve 45.

[0086] In the third embodiment, the controller 51 is supported by the hydraulic oil tank 48. The hydraulic oil tank 48 is made of sheet metal of a thickness that does not cause bending deformation due to the hydraulic pressure of the oil, due to its function of storing oil inside. In other words, the hydraulic oil tank 48 has sufficient strength to accommodate the mounting member of the controller 51. By using the side of the hydraulic oil tank 48 as the mounting location for the controller 51 in this way, it becomes possible to position the controller 51 in a location that facilitates the routing of the wire harness to the control valve 45.

[0087] Furthermore, in the first to third embodiments, a cooling mechanism 60 for cooling the hydraulic fluid is located behind the hydraulic fluid tank 48. This configuration facilitates the connection of piping between the cooling water path for cooling the engine 46 located behind the swing frame 7 and the cooling path for the hydraulic fluid stored in the hydraulic fluid tank 48.

[0088] The above-described embodiments are merely examples of the present invention, and the construction machinery according to the present invention is not limited to the above-described embodiments. Therefore, even in embodiments other than those described above, various modifications are possible depending on the design, etc., as long as they do not depart from the technical spirit of the present invention. Furthermore, the effects described in this disclosure are merely illustrative and not limiting, and other effects may also exist.

[0089] In the embodiment described above, the battery 49 was positioned in front of the control valve 45, but it may also be mounted, for example, at the bottom of the cooling mechanism 60 behind the hydraulic oil tank 48. In this case, it is preferable that the position does not block the vent of the right rear side cover portion 16b.

[0090] Furthermore, in the above-described embodiment, the hydraulic pump 41 is mechanically connected to the engine 46, but an electric motor to drive the hydraulic pump 41 may be provided separately from the engine 46, and the hydraulic pump 41 may be driven by the electric motor. Alternatively, a large-capacity rechargeable battery may be mounted on the swing frame 7 separately from the battery 49, and an electric motor that operates using power supplied from an external power source and the rechargeable battery may be used as the prime mover instead of the diesel engine 46.

[0091] Furthermore, in the above-described embodiment, the layout on the slewing frame 7 includes the cabin 10 on the left side and the engine room 9 on the right side and rear, but the left and right configurations may be reversed. Also, the control valve 45 may be located on the left side of the slewing frame 7, for example, below the cabin 10, relative to the hydraulic oil tank 48 which is located on the right side of the slewing frame 7, as long as it is in a position forward of the hydraulic oil tank 48 in the front-rear direction of the slewing frame 7. The orientation of the control valve 45 when it is positioned can be appropriately selected depending on the available space, such as vertical or horizontal orientation.

[0092] [Aspect] Furthermore, the present invention can take the following forms. (1) In a construction machine having a hydraulic oil tank for storing hydraulic oil discharged by a hydraulic pump driven by a prime mover, a plurality of hydraulic actuators operated by the hydraulic oil discharged from the hydraulic pump, and control valves for controlling the flow direction and flow rate of the hydraulic oil to the plurality of hydraulic actuators, The system includes a controller that outputs a signal to control the control valve, The controller is positioned opposite the hydraulic fluid tank. A construction machine characterized by the following features. (2) The controller is positioned in front of the rear of the hydraulic fluid tank. (1) Construction machinery as described above. (3) The hydraulic fluid tank is located on one side of the vehicle frame, The controller is positioned inward from the side of the hydraulic fluid tank that faces outward from the vehicle frame. (1) or (2) the construction machinery described above. (4) The control valve is positioned in front of the hydraulic fluid tank. The controller is located between the control valve and the hydraulic fluid tank. A construction machine as described in any of (1) to (3). (5) The controller is located to the side of the hydraulic fluid tank. A construction machine as described in any of (1) to (3). (6) The controller is supported by the hydraulic fluid tank. A construction machine as described in any of (1) to (5). (7) A partition plate is provided on the vehicle frame to separate the hydraulic oil tank and the control valve. The controller is supported by the partition plate, A construction machine as described in any of (1) to (4). (8) The driver's seat is located on the left and right sides of the aforementioned vehicle frame. The controller is supported by the wall on the driver's side facing the hydraulic fluid tank. (3) or (5) Construction machinery as described above. [Explanation of symbols]

[0093] 1. Excavation equipment (construction machinery) 2. Running vehicle 3. Drilling equipment 5. Running section 7. Swivel frame (vehicle frame) 9. Engine Room 9a Right engine room 10 cabins 11. Driver's Unit 14. Driver's seat support base 15. Driver's seat 16. Right hood (exterior cover) 18 Bulkhead (wall) 18a Plate member 18b Rib section 21 Boom 22 Arms 23 buckets 26. Boom Cylinder (Hydraulic Actuator) 27. Offset Cylinder (Hydraulic Actuator) 28. Arm Cylinder (Hydraulic Actuator) 29. Work tool cylinder (hydraulic actuator) 41 Hydraulic pump 42 Pilot pump 43 Hydraulic Actuator 44. Hydraulic motor (hydraulic actuator) for driving 45 Control valve 46 Engine (prime mover) 47 Operating device 48. Hydraulic oil tank 49 batteries 51 Controllers 52 Support member 52b Back panel (partition) 60 Cooling mechanism 61 Supply piping 66 Return piping

Claims

1. In a construction machine having a hydraulic oil tank for storing hydraulic oil discharged by a hydraulic pump driven by a prime mover, and control valves for controlling the flow direction and flow rate of hydraulic oil to a plurality of hydraulic actuators operated by the hydraulic oil discharged from the hydraulic pump, The system includes a controller that outputs a signal to control the control valve, The hydraulic fluid tank is located on one side of the vehicle frame, The control valve is positioned in front of the hydraulic fluid tank. The controller is positioned opposite the hydraulic fluid tank, forward of the rear of the hydraulic fluid tank, and inward of the side of the hydraulic fluid tank facing outward from the vehicle frame, and is located between the control valve and the hydraulic fluid tank. A construction machine characterized by the following features.

2. The controller is located to the side of the hydraulic fluid tank. The construction machine according to claim 1.

3. The controller is supported by the hydraulic fluid tank. The construction machine according to claim 1 or claim 2.

4. A construction machine having a hydraulic oil tank for storing hydraulic oil discharged by a hydraulic pump driven by a prime mover, and a control valve for controlling the flow direction and flow rate of hydraulic oil to a plurality of hydraulic actuators operated by the hydraulic oil discharged from the hydraulic pump, The system includes a controller that outputs a signal to control the control valve, The controller is positioned opposite the hydraulic fluid tank, A partition plate is provided on the vehicle frame to separate the hydraulic oil tank and the control valve. The controller is supported by the partition plate, A construction machine characterized by the following features.

5. The driver's seat is located on the left and right sides of the aforementioned vehicle frame. The controller is supported by the wall on the driver's side facing the hydraulic fluid tank. The construction machine according to claim 2.

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