EP4644617A1

EP4644617A1 - Work machine

Info

Publication number: EP4644617A1
Application number: EP23911971.2A
Authority: EP
Inventors: Takashi Miura; Yoshinori Torii; Hiroshi Kawanami; Junichi Fujiwara; Hajime Nomura
Original assignee: Kubota Corp
Current assignee: Kubota Corp
Priority date: 2022-12-26
Filing date: 2023-12-22
Publication date: 2025-11-05
Also published as: WO2024143191A1; US20250290280A1

Abstract

To enhance the durability of an electrical device (227) provided in a working machine (1).

A working machine (1) includes a machine body (2), a hood (14) to cover a prime mover (91) provided in the machine body (2), and an electrical device (227) provided inside the hood (14). The hood (14) includes an outside air intake port (89) to allow cooling air (F1) for cooling the prime mover (91) to pass into the hood. The electrical device (227) is located in the vicinity of the outside air intake port (89) such that the electrical device is covered with the hood (14).

Description

Technical Field

The present invention relates to a working machine such as a backhoe.

Background Art

Working machines disclosed in PTL 1 and PTL 2 are known.
The working machine disclosed in PTL 1 is provided with an auto-idle motor that automatically decreases the engine rotation speed to an idling state when a hydraulic actuator provided in the working machine is not actuated, that is, when no load is acting.
The working machine disclosed in PTL 2 includes a prime mover provided in a machine body and a hood covering the prime mover.

Citation List

Patent Literature

PTL 1: Japanese Unexamined Patent Application Publication No. 2001-271385
PTL 2: Japanese Unexamined Patent Application Publication No. 2021-183768

Summary of Invention

Technical Problem

In the known working machine, the auto-idle motor is provided on a swivel base plate defining a bottom portion of a swivel base swivelably provided on a traveling device. However, on the swivel base plate, devices that generate heat are arranged and the temperature tends to increase. When the auto-idle motor, which is an electrical device, is provided on the swivel base plate, there is a possibility that the durability of the auto-idle motor is deteriorated.
Meanwhile, a controller for controlling an electric device provided in a working machine is provided in the working machine, and the controller may be arranged inside a hood. When the controller is located inside the hood, it is desirable to arrange the controller at a position at which the cooling performances of coolers such as a radiator and an oil cooler arranged inside the hood are not impaired.
In view of the above-described problem, an object of the present invention is to provide a working machine capable of enhancing the durability of an electrical device provided in the working machine.
In view of the above-described problem, another object of the present invention is to provide a working machine capable of ensuring an installation location of a controller inside a hood without impairing the cooling performance of a cooler.

Solution to Problem

A working machine according to an example embodiment of the present invention includes a machine body, a hood to cover a prime mover provided in the machine body, and an electrical device provided inside the hood, wherein the hood includes an outside air intake port to allow cooling air for cooling the prime mover to pass into the hood, and the electrical device is located in a vicinity of the outside air intake port such that the electrical device is covered with the hood.
The working machine may include a cooling fan to generate the cooling air, and at least one cooler located upstream of the cooling fan in a direction of flow of the cooling air. The electrical device may be located between the outside air intake port and the cooling fan in plan view, and a half or more of a projected area of the electrical device may be located higher than an upper end portion of the outside air intake port in side view.
The electrical device may be positioned such that a half or more of the projected area of the electrical device is located higher than an upper end of a blade of the cooling fan.
The at least one cooler may include a radiator. The radiator may include an upper tank at an upper portion, a lower tank at a lower portion, and a core portion provided between the upper tank and the lower tank. The electrical device may be located upstream of the radiator in the direction of flow of the cooling air such that the electrical device faces the upper tank.
The at least one cooler may include a plurality of coolers. The plurality of coolers may include a first cooler and a second cooler arranged along the direction of flow of the cooling air. The second cooler may be located upstream of the first cooler in the direction of flow of the cooling air such that the second cooler is lower than an upper end of the first cooler. The electrical device may be located above the second cooler such that the electrical device faces an upper portion of the first cooler.
The first cooler may be a radiator. The second cooler may be an oil cooler.
The working machine may further include a rotation speed governor provided in or on the prime mover or in a vicinity of the prime mover to adjust a rotation speed of the prime mover, and a cable to operably connect the rotation speed governor and the electrical device to each other. The prime mover and the rotation speed governor may be located downstream of the cooling fan in the direction of flow of the cooling air. The electrical device may be located upstream of the at least one cooler in the direction of flow of the cooling air. The cable may be guided from the electrical device to the rotation speed governor through a space below the at least one cooler and the cooling fan.
The working machine may further include an intake pipe to supply air to the prime mover. The intake pipe may be located farther away from the outside air intake port than the electrical device in side view such that the intake pipe is covered with the hood.
The working machine may further include a cover to protect the electrical device.
The electrical device may be an auto-idle motor to automatically reduce a rotation speed of the prime mover toward an idling rotation speed when a hydraulic actuator provided in the working machine is not actuated.
The working machine may further include a manipulator located above the hood, and a controller located below the manipulator and inside the hood.
A working machine according to another aspect of the present invention includes a machine body, a prime mover provided in the machine body, a hood to cover the prime mover, a manipulator located above the hood, and a controller located below the manipulator and inside the hood.
The working machine may further include a cover member to cover an upper side of the controller.
The cover member may be located above the controller to receive an intrusion object intruding through a gap between the manipulator and the hood.
The cover member may be positioned such that the cover member is inclined downward toward a position deviated from the controller in a horizontal direction.
The working machine may further include an attachment portion to attach the cover member thereto, and an attachment tool to attach the cover member to the attachment portion. The attachment portion may include an abutting portion. The cover member may include an abutted portion. The abutted portion may be configured to abut on the abutting portion to restrict rotation of the cover member about the attachment tool and hold the cover member such that the cover member is inclined downward.
The working machine may further include a cooling fan to generate cooling air for cooling the prime mover, and a cooler located upstream of the prime mover in a direction of flow of the cooling air. The controller may be located downstream of the prime mover in the direction of flow of the cooling air.
The working machine may further include a hydraulic pump to be driven by the prime mover. The controller may be located above the hydraulic pump.
The working machine may further include a muffler to receive exhaust gas guided from the prime mover. The controller may be located above the muffler.
The working machine may further include a heat shield body to shield the controller from heat transferred from a side where the prime mover is present.
The working machine may further include an attachment bracket to attach the controller thereto. The attachment bracket may be located at a distance from the heat shield body.
The working machine may further include a support frame vertically provided on the machine body inside the hood to support the hood. The attachment bracket may be attached to the support frame.

Advantageous Effects of Invention

According to the above-described working machine, the electrical device is located at the position that is in the vicinity of the outside air intake port inside the hood and that is covered with the hood, and therefore the durability of the electrical device can be enhanced.
According to the above-described working machine, the controller is located below the manipulator, inside the hood, and therefore the installation location of the controller can be ensured inside the hood without the cooling performance of the cooler impaired.

Brief Description of Drawings

[FIG. 1] FIG. 1 is an overall side view of a working machine.
[FIG. 2] FIG. 2 is a left perspective view of a machine body and an operation unit.
[FIG. 3] FIG. 3 is a plan view of the machine body.
[FIG. 4] FIG. 4 is a right perspective view of the machine body and the operation unit.
[FIG. 5] FIG. 5 is a perspective view of a cover device as viewed from the rear.
[FIG. 6] FIG. 6 is a perspective view illustrating the interior of a prime mover room.
[FIG. 7] FIG. 7 is a perspective view illustrating a radiator and a frame member.
[FIG. 8] FIG. 8 is a rear sectional view of the prime mover room.
[FIG. 9] FIG. 9 is a front sectional view of the prime mover room.
[FIG. 10] FIG. 10 is an exploded perspective view of a third cover body.
[FIG. 11] FIG. 11 is a perspective view of a state in which the frame member has been attached to a support frame.
[FIG. 12] FIG. 12 is a perspective view of a state in which the frame member has been detached from the support frame.
[FIG. 13] FIG. 13 is a side view illustrating an arrangement of an electrical device, an angle detector, and an intake pipe.
[FIG. 14] FIG. 14 is a side view illustrating the arrangement of the electrical device, the angle detector, and the intake pipe.
[FIG. 15] FIG. 15 is a side view illustrating an arrangement relationship of an upper portion of the radiator, the electrical device, and the like.
[FIG. 16] FIG. 16 is a diagram of a system that controls the rotation speed of a prime mover.
[FIG. 17] FIG. 17 is a side view of the state in which the frame member has been attached to the support frame.
[FIG. 18] FIG. 18 is an exploded perspective view of an upper portion of the frame member.
[FIG. 19] FIG. 19 is an exploded perspective view of an AI motor, a drive body, and the angle detector.
[FIG. 20] FIG. 20 is a perspective view of an assembly of the AI motor, the drive body, and the angle detector.
[FIG. 21] FIG. 21 is a side view illustrating motions of the AI motor and the angle detector.
[FIG. 22] FIG. 22 is a perspective view of an assembly of a cover.
[FIG. 23] FIG. 23 is a side view of the assembly of the cover.
[FIG. 24] FIG. 24 is a perspective view of a state in which the cover has been detached.
[FIG. 25] FIG. 25 is a front view of the cover.
[FIG. 26] FIG. 26 is a side view illustrating a relationship between the AI motor and a cooling fan.
[FIG. 27] FIG. 27 is rear view, partly in section, illustrating the interior of a prime mover room.
[FIG. 28] FIG. 28 is a rear perspective view illustrating an installation location of a controller.
[FIG. 29] FIG. 29 is a perspective view illustrating a swivel base plate, a support frame, and the like.
[FIG. 30] FIG. 30 is a right side view illustrating the installation location of the controller.
[FIG. 31] FIG. 31 is a rear view illustrating the installation location of the controller.
[FIG. 32] FIG. 32 is an enlarged perspective view of an installation location of the controller.
[FIG. 33] FIG. 33 is an enlarged plan view of the installation location of the controller.
[FIG. 34] FIG. 34 is an exploded perspective view of the controller and an attachment bracket.
[FIG. 35 ] FIG. 35 is a rear perspective view illustrating a frame of a manipulator.
[FIG. 36] FIG. 36 is a right side view illustrating the frame of the manipulator.
[FIG. 37] FIG. 37 is a perspective view illustrating a rear portion of the frame of the manipulator.
[FIG. 38] FIG. 38 is a perspective view illustrating the frame of the manipulator.
[FIG. 39] FIG. 39 is a partially exploded perspective view illustrating the frame of the manipulator.
[FIG. 40] FIG. 40 is a perspective view illustrating a heat shield body.
[FIG. 41] FIG. 41 is a perspective view of the heat shield body as viewed from below.
[FIG. 42] FIG. 42 is an exploded perspective view of the heat shield body.
[FIG. 43] FIG. 43 is a perspective view of the heat shield body and a hydraulic fluid tank as viewed from the rear.
[FIG. 44] FIG. 44 is a perspective view of the heat shield body and the hydraulic fluid tank as viewed from the front.
[FIG. 45] FIG. 45 is a perspective view of the heat shield body and the hydraulic fluid tank as viewed from the left.
[FIG. 46] FIG. 46 is a side sectional view of the heat shield body with an enlarged view of a portion thereof.
[FIG. 47] FIG. 47 is a perspective view illustrating a seal portion between the heat shield body and a fourth cover body.
[FIG. 48] FIG. 48 is a side sectional view of the controller and the heat shield body.
[FIG. 49] FIG. 49 is a perspective view illustrating a seal portion between the heat shield body, and a first cover body and the fourth cover body.

Description of Embodiments

Hereinafter, embodiments of the present invention will be described with reference to the drawings as appropriate.
FIG. 1 is a schematic side view illustrating an overall configuration of a working machine 1 according to the present embodiment. In the present embodiment, a backhoe, which is a turning working machine, is exemplified as the working machine 1.
As illustrated in FIG. 1, the working machine 1 includes a machine body (swivel base) 2, a traveling device 3, and a working device 4. An operator's seat 6 on which an operator is seated and a four-pillar-type ROPS 15 are provided on the machine body 2. The operator's seat 6 includes a seat portion 6A and a back rest portion 6B. The seat portion 6A is a section on which the operator is seated (the hip and the thighs are placed). The back rest portion 6B is a section on which the seated operator leans his/her back, and is provided at a rear portion of the seat portion 6A so as to extend upward. The ROPS 15 has a canopy specification including a roof 19.
In the present embodiment, a direction toward the front of the operator seated on the operator's seat 6 of the working machine 1 (arrow A1 direction in FIG. 1) is described as a forward side (machine-body forward side), a direction toward the rear of the operator (arrow A2 direction in FIG. 1) is described as a rearward side (machine-body rearward side), and an arrow A3 direction in FIG. 1 is described as a front-rear direction (machine-body front-rear direction). Also, a direction toward the left of the operator (near side in FIG. 1) is described as a leftward side, and a direction toward the right of the operator (far side in FIG. 1) is described as a rightward side.
Also, a horizontal direction that is a direction orthogonal to the front-rear direction A3 is described as a machine-body width direction. A direction from a central portion to a right portion or a left portion in a width direction of the machine body 2 is described as an outward side in the machine-body width direction. That is, the outward side in the machine-body width direction is a direction away from the center in the width direction of the machine body 2 in the machine-body width direction. A direction opposite to the outward side in the machine-body width direction is described as an inward side in the machine-body width direction. That is, the inward side in the machine-body width direction is a direction toward the center in the width direction of the machine body 2 in the machine-body width direction.
As illustrated in FIG. 1, the traveling device 3 is a crawler type traveling device that supports the machine body 2 so as to be travelable, and includes a traveling frame 3A, a first traveling device 3L provided leftward of the traveling frame 3A, and a second traveling device 3R provided rightward of the traveling frame 3A. The first traveling device 3L and the second traveling device 3R are driven by a traveling motor M1 including a hydraulic motor (hydraulic actuator). In the present embodiment, the crawler type traveling device 3 is used, but this does not imply any limitation, and a wheel type traveling device or the like may be used. A dozer device 7 is attached to a front portion of the traveling device 3. The dozer device 7 can be driven by a dozer cylinder including a hydraulic cylinder (hydraulic actuator).
As illustrated in FIG. 1, the machine body 2 includes a swivel base plate 5 that is made of a thick plate member and defines a bottom portion of the machine body 2. The swivel base plate 5 is supported on the traveling frame 3A of the traveling device 3 via a turning bearing 8 so as to be turnable about a turning axis X1 that is an axis extending in an up-down direction. The swivel base plate 5 is driven to turn about the turning axis X1 by a turning motor 99 (see FIG. 3). Additionally, the machine body 2 includes, at a front portion thereof, a support bracket 9 and a swing bracket 10 that support the working device 4. The support bracket 9 is provided so as to protrude forward from the machine body 2. Specifically, the support bracket 9 is fixed to a front portion of the swivel base plate 5 and protrudes forward from the swivel base plate 5. The swing bracket 10 is attached to a front portion of the support bracket 9 so as to be swingable about a vertical axis (an axis extending in the up-down direction).
As illustrated in FIG. 1, the working device 4 includes a boom 11, an arm 12, and a bucket 13. A proximal portion of the boom 11 is pivotally attached to an upper portion of the swing bracket 10 so as to be rotatable about a horizontal axis (an axis extending in the machine-body width direction). The arm 12 is pivotally attached to a distal end portion of the boom 11 so as to be rotatable about a horizontal axis. The bucket 13 is provided at a distal end portion of the arm 12 so as to be capable of performing a shoveling motion and a dumping motion. The shoveling motion is a motion of swinging the bucket 13 in a direction toward the boom 11, and is, for example, a motion of shoveling earth and sand or the like. Also, the dumping motion is a motion of swinging the bucket 13 in a direction away from the boom 11, and is, for example, a motion of dropping (discharging) shoveled earth and sand or the like.
The swing bracket 10 is swingable by extension/contraction of a swing cylinder (not illustrated). The boom 11 is swingable by extension/contraction of a boom cylinder C2. The arm 12 is swingable by extension/contraction of an arm cylinder C3. The bucket 13 is capable of performing the shoveling motion and the dumping motion by extension/contraction of a bucket cylinder C4. The swing cylinder, the boom cylinder C2, the arm cylinder C3, and the bucket cylinder C4 include hydraulic cylinders (hydraulic actuators).
As illustrated in FIG. 2, an operation unit 18 is provided on the machine body 2. The operation unit 18 includes the operator's seat 6, a traveling lever 16 (see FIG. 1) arranged forward of the operator's seat 6, a manipulator (left manipulator) 17L arranged leftward of the operator's seat 6 and a manipulator (right manipulator) 17R arranged rightward of the operator's seat 6, and the like. The traveling lever 16 is an operation member that operates the traveling device 3. The manipulators 17L and 17R are devices that operate the working device 4, the machine body 2, and the like. Specifically, the manipulators 17L and 17R are devices that perform, for example, a swinging operation of the boom 11, a swinging operation of the arm 12, operations of the shoveling motion and the dumping motion of the bucket 13, a turning operation of the machine body 2, and the like. A floor portion 21 that is a portion on which the operator places his/her feet is provided on an upper surface of the machine body 2 and forward of the operator's seat 6. The floor portion 21 is provided by, for example, a floor mat being laid on a step plate that is located above the swivel base plate 5 with a space interposed and supported by the swivel base plate 5. A weight 25 that balances the weight with the working device 4 is located at a rear portion of the machine body 2. The working machine 1 of the present embodiment is a compact backhoe. As illustrated in FIG. 1, the operator's seat 6 is located above a prime mover 91 (a prime mover room that houses the prime mover 91).
The left manipulator 17L includes a console cover 22, a manipulating lever (left manipulating lever) 23L, a remote control valve (not illustrated), an armrest 26L, and an operation lock lever (unloading lever) 30.
The console cover 22 is a member that covers the remote control valve, a frame mechanism of the left manipulator 17L, and the like. The left manipulating lever 23L is located at a front and upper portion of the left manipulator 17L, and is operable to be tilted forward/rearward and leftward/rightward. The remote control valve is a pilot valve that is operated with the left manipulating lever 23L, and is located below the left manipulating lever 23L. The remote control valve is housed in the console cover 22. The armrest 26L is a member on which an elbow and the like of the operator is placed, and is located rearward of the left manipulating lever 23L. The operation lock lever 30 is a lever that switches a hydraulic actuator provided in the working machine 1 between an operable state and an inoperable state.
As illustrated in FIG. 2, the right manipulator 17R includes a console cover 34, a manipulating lever (right manipulating lever) 23R, a remote control valve 309 (see FIG. 18), an armrest 26R, a dozer lever 35, and a plurality of switches 36.
The console cover 34 is a cover that covers a frame of the right manipulator 17R. The frame of the right manipulator 17R is attached to the machine body 2. The right manipulating lever 23R is located at a front and upper portion of the right manipulator 17R, and is operable to be tilted forward/rearward and leftward/rightward. The remote control valve 309 is a pilot valve that is operated with the right manipulating lever 23R, and is located below the right manipulating lever 23R and covered with the console cover 34. The armrest 26R is a member on which an elbow and the like of the operator is placed, and is located rearward of the right manipulating lever 23R. The dozer lever 35 is a lever that operates the dozer device 7. The plurality of switches 36 are arranged at an upper surface of the console cover 34, and are switches that operate various devices provided in the working machine 1.
As illustrated in FIG. 3, mounted objects such as the prime mover 91, a radiator (first cooler) 92, an oil cooler (second cooler) 93, a battery 94, a hydraulic pump 95, a fuel tank 96, a hydraulic fluid tank 97, a control valve 98, and the turning motor 99 are provided in the machine body 2. The prime mover 91 is, for example, a diesel engine. The prime mover 91 may be a gasoline engine or an electric motor, or may be a hybrid type including an engine and an electric motor.
A cooling fan 100 is attached to one side in the machine-body width direction (left portion) of the prime mover 91. The cooling fan 100 is driven by the prime mover 91 and generates cooling air F1 flowing from the left to the right. In other words, the cooling fan 100 is a suction type fan that rotates about an axis (rotation axis 100a) extending in the machine-body width direction to suck air (outside air) from the left of the machine body 2 and causes the air to flow toward the prime mover 91. Specifically, the cooling fan 100 takes in the outside air from the outside of a hood 14 (described later) to the inside of the hood 14, and causes the outside air to flow to the prime mover 91, thereby cooling the prime mover 91. That is, the cooling fan 100 generates the cooling air F1 for cooling the prime mover 91 and the like. In other words, the cooling fan 100 generates the cooling air F1 for cooling the prime mover 91, the radiator 92, the oil cooler 93, and the like. The prime mover 91 is located downstream of the cooling fan 100 in a direction of flow of the cooling air F1 (a direction in which the cooling air F1 flows).
As illustrated in FIG. 26, the outside shape of the cooling fan 100 includes a columnar central portion 100A having an axis extending in the machine-body width direction, and a plurality of (for example, seven) blades 100B having proximal portions fixed to the outer periphery of the central portion 100A. The cooling fan 100 (central portion 100A) is attached to a fan drive body (not illustrated) that is driven with power of the prime mover 91. The plurality of blades 100B are provided on the outer periphery of the central portion 100A to be spaced apart from each other in the circumferential direction over the entire circumference.
Reference sign 100b in FIG. 26 denotes an outer circumferential circle 100b of the cooling fan 100. The outer circumferential circle 100b is an outer circumferential locus drawn by outer circumferential ends of the blades 100B (end portions farthest from the rotation axis 100a in a direction orthogonal to the rotation axis 100a) through rotation of the cooling fan 100.
The radiator 92 is a cooler that cools a coolant for cooling the prime mover 91.
As illustrated in FIG. 7, the radiator 92 includes an upper tank 92a at an upper portion, a lower tank 92b at a lower portion, and a core portion 92c provided between the upper tank 92a and the lower tank 92b. The coolant, which has taken heat of the prime mover 91 and increased in temperature, is sent to the upper tank 92a through a pipe such as a hose or a steel pipe. The coolant increased in temperature is stored in the upper tank 92a and sent from the upper tank 92a to the core portion 92c. The coolant sent to the core portion 92c is cooled while flowing through the core portion 92c from the upper side to the lower side. That is, the cooling air F1 generated by the cooling fan 100 passes through the core portion 92c, and the coolant is cooled with the cooling air F1 passing through the core portion 92c. The coolant at an appropriate temperature is stored in the lower tank 92b and sent to the prime mover 91.
The oil cooler 93 is a cooler that cools a return hydraulic fluid that returns from a hydraulic actuator such as a hydraulic cylinder or a hydraulic motor.
As illustrated in FIGS. 3 and 6, the radiator 92 and the oil cooler 93 are arranged upstream of the cooling fan 100 in the direction of flow of the cooling air F1 (leftward of the cooling fan 100), and cooled with the cooling air F1. Also, the radiator 92 and the oil cooler 93 are arranged in the machine-body width direction. In other words, the radiator 92 and the oil cooler 93 are arranged in the direction in which the cooling air F1 flows (the direction of the cooling air F1). Specifically, the radiator 92 is located downstream (leeward) of the oil cooler 93 in the direction of flow of the cooling air F1. Conversely, the oil cooler 93 is located upstream (windward) of the radiator 92 in the direction of flow of the cooling air F1. The oil cooler 93 is located at a position lower than an upper end of the radiator 92. It is sufficient that at least one cooler is located upstream of the cooling fan 100 in the direction of flow of the cooling air F1.
The battery 94 is a storage battery that supplies electric power to an electrical component provided in the working machine 1. The hydraulic pump 95 is driven with the power of the prime mover 91, and delivers a hydraulic fluid (pressure fluid) for driving a hydraulic actuator such as a hydraulic motor or a hydraulic cylinder provided in the working machine 1. Also, the hydraulic pump 95 delivers a pilot pressure for actuating a hydraulic valve and a pressure fluid for a signal. The fuel tank 96 is a tank that stores fuel for the prime mover 91. The hydraulic fluid tank 97 is a tank that stores the hydraulic fluid. The control valve 98 controls the flow rate of the hydraulic fluid that is supplied to the hydraulic actuator that is driven with the hydraulic fluid delivered from the hydraulic pump 95. The turning motor 99 includes a hydraulic motor (hydraulic actuator) and is a motor that turns (rotationally drives) the machine body 2 about the turning axis X1.
As illustrated in FIG. 3, the prime mover 91 is located in the rear portion of the machine body 2 and in a middle portion in the width direction of the machine body 2. Also, the prime mover 91 is located below the operator's seat 6. The radiator 92 is located leftward of the prime mover 91 and the cooling fan 100. The oil cooler 93 is located leftward of the radiator 92. The battery 94 is located leftward of the oil cooler 93 and lower than the oil cooler 93. The hydraulic pump 95 is attached to another side in the machine-body width direction (right portion) of the prime mover 91. The fuel tank 96 is located in a right portion of the machine body 2 and in the front portion of the machine body 2. In other words, the fuel tank 96 is located rightward and forward of the operator's seat 6. The hydraulic fluid tank 97 is located rearward of the fuel tank 96 and forward of the hydraulic pump 95. In other words, the hydraulic fluid tank 97 is located in the right portion and in a middle portion in the front-rear direction of the machine body 2. The control valve 98 is located in a front and left portion of the machine body 2. The turning motor 99 is located in the middle portion in the front-rear direction of the machine body 2 and in the middle portion in the width direction of the machine body 2. Also, the turning motor 99 is located forward of the operator's seat 6 and lower than the operator's seat 6.
As illustrated in FIG. 1, a cover device 101 is provided above the machine body 2, to cover mounted objects including mounted devices such as the prime mover 91 and mounted members such as the tanks provided in the machine body 2. As illustrated in FIG. 3, the cover device 101 covers the prime mover 91, the radiator 92, the oil cooler 93, the battery 94, the hydraulic pump 95, the fuel tank 96, and the hydraulic fluid tank 97. The control valve 98 and the turning motor 99 are arranged inside the machine body 2 (below the floor portion 21).
The cover device 101 includes a plurality of cover bodies 101A to 101D. The plurality of cover bodies 101A to 101D include a cover body (referred to as a first cover body) 101A arranged below the operator's seat 6. The first cover body 101A is provided in a fixed manner with respect to the machine body 2. Also, the first cover body 100A covers the upper side and the front of the prime mover 91. Specifically, the first cover body 100A includes a front wall 101Aa (see FIGS. 2 and 4) located forward of the prime mover 91, and an upper wall 101Ab (see FIGS. 5 and 27) located above the prime mover 91. Also, as illustrated in FIG. 5, the upper wall 101Ab includes a rear wall portion 101Ab1 that is placed on and fixed to a rear upper frame 147 of a support frame 142 (described later).
Also, the plurality of cover bodies 101A to 101D include a cover body (referred to as a second cover body) 101B arranged rearward of the first cover body 101A and the prime mover 91. The second cover body 101B openably/closably covers the rear of the prime mover 91. As indicated by a two-dot chain line in FIG. 5, a right end portion of the second cover body 101B is supported so as to be rotatable about an axis extending in the up-down direction with respect to the machine body 2, and therefore the second cover body 101B is openable/closable. Also, the plurality of cover bodies 101A to 101D include a cover body (referred to as a third cover body) 101C arranged leftward of the prime mover 91, the cooling fan 100, the radiator 92, the oil cooler 93, and a shroud 141 (described later). The third cover body 101C openably/closably covers the outer side in the machine-body width direction (left) of the prime mover 91, the cooling fan 100, the radiator 92, the oil cooler 93, the shroud 141, and the like.
As illustrated in FIGS. 3, 8, and 9, the third cover body 101C covers the radiator 92, the oil cooler 93, and the like from the left. As illustrated in FIGS. 1 and 2, the third cover body 101C is provided with an outside air intake port 89 for taking in the outside air (for taking in the cooling air F1) to the inner side (the inside of the hood 14). As indicated by a two-dot chain line in FIG. 5, a front end portion of the third cover body 101C is supported so as to be rotatable about an axis extending in the up-down direction with respect to the machine body 2, and therefore the third cover body 101C is openable/closable.
As illustrated in FIG. 10, the third cover body 101C includes a cover main body 221, an intake port defining body 222 in which the outside air intake port 89 is provided, and a covering member 157 that covers the outside air intake port 89. The cover main body 221 has an upper wall portion 221a, a side wall portion 221b, a front wall portion 221c, and a rear wall portion 221d. A portion of a front portion of the upper wall portion 221a corresponding to the left manipulator 17L is cut out (a cutout portion 221e is provided). An opening 223 is in the side wall portion 221b. The intake port defining body 222 is located at a position corresponding to the opening 223 and is attached to an attachment portion 221f provided at a peripheral edge portion of the opening 223. The covering member 157 is made of a member that allows air to pass therethrough, such as a perforated metal.
Also, the plurality of cover bodies 101A to 101D include a cover body (referred to as a fourth cover body) 101D arranged at the right portion of the machine body 2.
The first cover body 101A, the second cover body 101B, the third cover body 101C, and a rear portion of the fourth cover body 101D define a prime mover room (engine room) that houses the prime mover 91. In other words, the first cover body 101A, the second cover body 101B, the third cover body 101C, and the rear portion of the fourth cover body 101D define the hood 14 that defines the prime mover room. The hood 14 is openable/closable. Specifically, the hood 14 includes the openable/closable cover bodies (the second cover body 101B and the third cover body 101C), and therefore the hood 14 is openable/closable. While the hood 14 includes the plurality of openable/closable cover bodies in the present embodiment, the hood 14 may include one openable/closable cover body. Also, in the present embodiment, a portion of the hood 14 is openable/closable, but the entire hood 14 may be openable/closable. That is, the hood 14 being openable/closable means that a portion or the whole of the hood 14 is openable/closable. As illustrated in FIG. 6, a prime mover room 91A houses the radiator 92, the oil cooler 93, the battery 94, the hydraulic pump 95, and the like, in addition to the prime mover 91.
A lower portion of a rear surface of the prime mover room 91A is defined by the weight 25. Lower portions of left and right side surfaces of the prime mover room 91A include left and right portions of the weight 25 and a machine body cover 107 (see FIGS. 1, 2, and 4). The machine body cover 107 is a cover that defines the outer contours of a front surface, a left side surface, and a right side surface of the machine body 2. Also, a lower portion of a front surface of the prime mover room 91A includes a partition wall body 150 (described later).
A front portion of the fourth cover body 101D defines a tank room that houses the fuel tank 96 and the hydraulic fluid tank 97. In other words, the front portion of the fourth cover body 101D defines a tank cover portion 103 that defines the tank room (see FIG. 3). That is, it can be also said that the cover device 101 includes the hood 14 and the tank cover portion 103. The tank room communicates with the prime mover room 91A. The fourth cover body 101D is provided rightward of the operator's seat 6 so as to extend forward with respect to the operator's seat 6. That is, the front portion (tank cover portion 103) of the fourth cover body 101D extends forward with respect to the operator's seat 6 from a lateral side of the operator's seat 6.
As illustrated in FIG. 4, the fourth cover body 101D includes a main cover 104 and a side surface cover (side wall portion) 105. The main cover 104 and the side surface cover 105 are made of metal plate members (sheet metals). The main cover 104 and the side surface cover 105 may be made of plate members such as resin plates. The main cover 104 has an upper wall 104a, a side wall 104b, and a front wall 104c.
As illustrated in FIGS. 3 and 4, the side wall 104b defines a right side surface of the fourth cover body 101D. Specifically, the side wall 104b is provided from the front portion to the rear portion of the machine body 2, and defines a right side surface of the tank room and a right side surface of the prime mover room 91A.
As illustrated in FIGS. 5 and 27, a middle portion in the front-rear direction and a rear portion of an upper surface of the fourth cover body 101D are provided as a cutout portion 106 that is cut out from the middle portion to the rear portion. The right manipulator 17R is located above the cutout portion 106 (see FIGS. 4 and 27). A discharge port 88 for discharging the air taken into the hood 14 is in a rear portion of the side wall 104b (see FIG. 4). The discharge port 88 is covered with a covering member 157 that allows air to pass therethrough, such as a perforated metal (see FIG. 8).
As illustrated in FIG. 4, the fourth cover body 101D (tank cover portion 103) is provided with a fuel supply port cover 113 that openably closes an opening 108 to expose a fluid supply port of the fuel tank 96 and a fluid supply port of the hydraulic fluid tank 97.
As illustrated in FIG. 4, the side surface cover 105 defines an upper portion of a left side surface of the tank room. In other words, the side surface cover 105 defines a side wall portion near the operator's seat 6, of the front portion of the fourth cover body 101D.
As illustrated in FIG. 6, the working machine 1 includes the support frame 142 vertically provided on the machine body 2. The support frame 142 is located inside the hood 14 (inside the prime mover room 91A) together with the prime mover 91, the cooling fan 100, the radiator 92, the oil cooler 93, and the like, and vertically provided on the machine body 2 inside the hood 14. Also, the support frame 142 supports the hood 14 and the like.
As illustrated in FIGS. 6, 11, and 12, the support frame 142 includes a pair of front pillar portions 143, a pair of rear pillar portions 144, a pair of upper side frame portions 145, a front upper frame 146, a rear upper frame 147, a front attachment plate 148, and a pair of rear attachment plates 149. The configuration of the support frame 142 can be variously changed, and the number of components constituting the support frame 142 is not limited to the number of components in the embodiment.
The pair of front pillar portions 143 are arranged forward of the prime mover 91 with a space interposed therebetween in the machine-body width direction. The pair of front pillar portions 143 include a left front pillar portion (referred to as a first front pillar portion) 143L arranged at the left portion of the machine body 2 (swivel base plate 5), and a right front pillar portion (referred to as a second front pillar portion) 143R arranged at the right portion of the machine body 2 (swivel base plate 5). The pair of rear pillar portions 144 are arranged rearward of the prime mover 91 with a space interposed therebetween in the machine-body width direction. The pair of rear pillar portions 144 include a left rear pillar portion (referred to as a first rear pillar portion) 144L arranged rearward of the first front pillar portion 143L, and a right rear pillar portion (referred to as a second rear pillar portion) 144R arranged rearward of the second front pillar portion 143R.
The pair of upper side frame portions 145 include a left upper side frame portion (referred to as a first upper side frame portion) 145L integrally extending rearward from an upper portion of the first front pillar portion 143L, and a right upper side frame portion (referred to as a second upper side frame portion) 145R integrally extending rearward from an upper portion of the second front pillar portion 143R. A rear portion of the first upper side frame portion 145L abuts on an upper portion of the first rear pillar portion 144L and is fixed to the upper portion. A rear portion of the second upper side frame is located leftward of an upper portion of the second rear pillar portion 144R and fixed to the upper portion.
The front upper frame 146 couples the upper portion of the first front pillar portion 143L and a front portion of the first upper side frame portion 145L to the upper portion of the second front pillar portion 143R and a front portion of the second upper side frame portion 145R. The rear upper frame 147 couples the upper portion of the first rear pillar portion 144L and the rear portion of the first upper side frame portion 145L to the upper portion of the second rear pillar portion 144R and the rear portion of the second upper side frame portion 145R.
The front attachment plate 148 is provided to extend between a lower end portion of the first front pillar portion 143L and a lower end portion of the second front pillar portion 143R, and couples these lower end portions to each other. The front attachment plate 148 is fixed to an upper portion of the partition wall body 150 vertically provided on the swivel base plate 5, by a bolt or the like. The partition wall body 150 is a component constituting the machine body 2 together with the swivel base plate 5, and partitions the lower portion of the front surface of the prime mover room 91A. That is, the partition wall body 150 is a separation wall member that separates the prime mover room 91A from a space located forward of a lower portion of the prime mover room 91A. In the present embodiment, the first front pillar portion 143L and the second front pillar portion 143R are vertically provided on the partition wall body 150 constituting the machine body 2.
The pair of rear attachment plates 149 include a first rear attachment plate 149L fixed to a lower end portion of the first rear pillar portion 144L, and a second rear attachment plate 149R fixed to a lower end portion of the second rear pillar portion 144R. The first rear attachment plate 149L is attached to an upper portion of a first bracket member 151L vertically provided on the swivel base plate 5. The second rear attachment plate 149R is attached to an upper portion of a second bracket member 151R vertically provided on the swivel base plate 5. The first bracket member 151L and the second bracket member 151R are components constituting the machine body 2 together with the swivel base plate 5. In the present embodiment, the first rear pillar portion 144L and the second rear pillar portion 144R are vertically provided on the first bracket member 151L and the second bracket member 151R constituting the machine body 2.
As illustrated in FIG. 11, a pair of vertical ribs 224L and 224R extending rearward from the support bracket 9 are provided on the swivel base plate 5. A rear portion of the left vertical rib 224L is connected to the first bracket member 151L via a connection plate 225. A cutout portion 226 is in the rear portion of the left vertical rib 224L. A rear portion of the right vertical rib 224R is connected to the second bracket member 151R.
As illustrated in FIG. 29, a partition member 292 and a support member 293 are provided at the right of a front portion of the support frame 142. The partition member 292 and the support member 293 are made of plate members. The partition member 292 is a member that provides partition between the support frame 142 and the hydraulic fluid tank 97. The partition member 292 is provided from a lower surface of the front portion of the second upper side frame portion 145R to the upper portion of the partition wall body 150. The partition member 292 abuts on and is welded to the lower surface of the front portion of the second upper side frame portion 145R, the upper portion of the partition wall body 150, and a rear surface of the second front pillar portion 143R. The partition member 292 is provided so as to protrude rightward from the support frame 142, and a seal member 294 is attached to an upper portion of a portion of the partition member 292 protruding rightward from the support frame 142. The seal member 294 is located rightward of the front portion of the second upper side frame portion 145R (see FIG. 32).
The support member 293 is located rearward of an upper portion of the partition member 292. A front end of the support member 293 is fixed to the partition member 292 by welding or the like. Also, the support member 293 protrudes rightward from the lower surface of the second upper side frame portion 145R of the support frame 142. The support member 293 may be fixed to the second upper side frame portion 145R.
As illustrated in FIG. 29, an attachment member 295 is provided on the second upper side frame portion 145R at a position located forward of the rear upper frame 147 and rearward of the support member 293. The attachment member 295 is fixed to the lower surface of the second upper side frame portion 145R by welding or the like.
As illustrated in FIG. 8, the shroud 141 that covers the cooling fan 100 is located rightward of the radiator 92. The shroud 141 is attached to the radiator 92. The shroud 141 is a cover that covers the cooling fan 100 to form an air flow so that the cooling air F1 generated by the cooling fan 100 efficiently flows from the outer side in the machine-body width direction (a side where the radiator 92 and the oil cooler 93 are arranged) to the inner side in the machine-body width direction (a side where the prime mover 91 is located). An air-blowing opening 141a corresponding to the outer circumferential circle of the cooling fan 100 is in the shroud 141, to enhance the efficiency of the cooling fan 100, and the cooling air F1 generated by the cooling fan 100 is blown toward the prime mover 91 via the air-blowing opening 141a. In the present embodiment, the shroud 141 is made of resin. Alternatively, the shroud 141 may be made of metal or the like.
As illustrated in FIGS. 6, 8 and 9, the prime mover 91 includes a cylinder block 192 including a plurality of cylinders and housing a crankshaft, a cylinder head 193 attached to an upper portion of the cylinder block 192, a head cover 194 covering an upper surface of the cylinder head 193, a transmission case 195 assembled to the left of the cylinder block 192, and an oil pan 196 assembled to the bottom of the cylinder block 192.
An oil supply pipe 197 for supplying a prime mover oil (engine oil) is assembled to a substantially central portion in the machine-body width direction of an upper surface of the head cover 194. An air cleaner 172 is located above a right portion of the head cover 194. A flywheel housing 199 is assembled to the right of the cylinder block 192, and the hydraulic pump 95 is assembled to the flywheel housing 199. The hydraulic pump 95 is a pump unit including a plurality of pumps. A muffler 200 to which exhaust gas from the prime mover 91 is guided is located above the flywheel housing 199. The muffler 200 is a device having a role of purifying the exhaust gas discharged from the prime mover 91, adjusting sound volume and sound quality, and the like.
As illustrated in FIG. 9, an intake manifold 201 connected to the air cleaner 172 is assembled to the front of the cylinder head 193. As illustrated in FIG. 8, an exhaust manifold 202 connected to the muffler 200 is assembled to the rear of the cylinder head 193.
As illustrated in FIGS. 8 and 9, an electrical device 227 is located leftward of an upper portion (upstream in the direction of flow of the cooling air F1) of the radiator 92 inside the hood 14. In the present embodiment, the electrical device 227 is an auto-idle motor (control motor) including a geared motor or the like. The electrical device 227 is not limited to the auto-idle motor.
The auto-idle motor 227 is a motor that can rotate forward/backward to change the rotation speed of the prime mover 91, and is a motor that automatically decreases the rotation speed of the prime mover 91 to a predetermined idling rotation speed when a hydraulic actuator provided in the working machine 1 is not actuated, that is, when no load is acting. Alternatively, the rotation speed of the prime mover 91 may be decreased to a rotation speed close to the rotation speed of idling when no load is acting. That is, it is only necessary to use a configuration in which the rotation speed of the prime mover 91 is automatically reduced toward an idling rotation speed when the hydraulic actuator provided in the working machine 1 is not actuated. Hereinafter, the auto-idle motor 227 is referred to as an AI motor.
As illustrated in FIG. 13, the AI motor 227 is located at a position that is in the vicinity of the outside air intake port 89 and that is covered with the hood 14.
Meanwhile, the AI motor 227 should be arranged at a location where the temperature does not become a predetermined temperature (for example, 60°C) or higher to attain high durability. The vicinity of the outside air intake port 89 is maintained at the predetermined temperature or lower, and it is possible to prevent or reduce a deterioration in durability of the AI motor 227 due to the influence of temperature. That is, by arranging the AI motor 227 in the vicinity of the outside air intake port 89, it is possible to prevent or reduce a deterioration in durability of the AI motor 227. Also, by arranging the AI motor 227 at the position covered with the hood 14, it is possible to prevent or reduce that the AI motor 227 gets wet with washing water, rainwater, or the like.
As described above, the AI motor 227 is located at the position that is in the vicinity of the outside air intake port 89 and that is covered with the hood 14, and therefore it is possible to enhance the durability of the AI motor 227.
As illustrated in FIGS. 8 and 9, the AI motor 227 is located at a position at which the obstruction of the cooling air F1 passing through the coolers (the radiator 92 and the oil cooler 93) is prevented or reduced. Specifically, the AI motor 227 is located between the outside air intake port 89 and the cooling fan 100 in a plan view (as viewed from above), and as illustrated in FIG. 13, a half or more of the projected area of the AI motor 227 is located higher than an upper end portion of the outside air intake port 89 in a side view. Also, the AI motor 227 is located above the oil cooler 93. Specifically, the AI motor 227 is located above the oil cooler 93 at a position overlapping the oil cooler 93 as viewed from above. Also, the AI motor 227 is located upstream of the upper portion of the radiator 92 in the direction of flow of the cooling air F1 so as to face the upper portion in the machine-body width direction. Specifically, as illustrated in FIG. 15, the AI motor 227 is located upstream of the radiator 92 in the direction of flow of the cooling air F1 so as to face the upper tank 92a. Also, the AI motor 227 is located near a rear portion of the upper portion of the radiator 92. Also, as illustrated in FIG. 26, the AI motor 227 is located such that a half or more of the projected area of the AI motor 227 is located higher than an upper end of the blades 100B (an upper end of the outer circumferential circle 100b) of the cooling fan 100.
By arranging the AI motor 227 above the oil cooler 93 so as to face the upper portion of the radiator 92, the obstruction of the cooling air F1 passing through the radiator 92 and the oil cooler 93 (coolers) can be prevented or reduced (substantially avoided).
As illustrated in FIGS. 13 and 14, an intake pipe 173 made of a hose, a steel pipe, or the like for supplying air to the prime mover 91 is located rearward of the AI motor 227. As illustrated in FIG. 6, the intake pipe 173 has one end portion (intake side) located on the side where the radiator 92 and the oil cooler 93 (coolers) are arranged, and another end portion (discharge side) connected to the intake side of the air cleaner 172. If the one end portion of the intake pipe 173 is located near the outside air intake port 89, suction noise generated by the intake pipe 173 taking in air leaks to the outside of the hood 14 and becomes noise. In the present embodiment, as illustrated in FIG. 13, the intake pipe 173 is located so as to be covered with the hood 14 at a position farther away from the outside air intake port 89 than the AI motor 227 in a side view. Accordingly, the leakage of the suction noise to the outside of the hood 14 can be prevented or reduced.
As illustrated in FIG. 14, an angle detector 228 that detects the rotation angle of the AI motor 227 (the rotation angle of an output shaft 227a of the AI motor 227) is located leftward (upstream in the direction of flow of the cooling air F1) of the AI motor 227. The angle detector 228 and the AI motor 227 arranged in the machine-body width direction, and therefore, as illustrated in FIG. 13, the angle detector 228 is also arranged at a position that is in the vicinity of the outside air intake port 89 and that is covered with the hood 14, and it is possible to prevent or reduce a deterioration in durability of the angle detector 228 due to an external factor such as the temperature environment, water, or the like in the periphery of the angle detector 228. The angle detector 228 includes, for example, a potentiometer or the like.
As illustrated in FIG. 16, the AI motor 227 is operably connected to a rotation speed governor (governor) 229 provided in the prime mover 91 by a cable 230. Also, the AI motor 227 and the angle detector 228 are connected to a controller 231. The controller 231 includes, for example, a microcomputer including a central processing unit (CPU), an electrically erasable programmable read-only memory (EEPROM), and the like.
Alternatively, the rotation speed governor 229 may be provided in the vicinity of the prime mover 91. Also, the rotation speed governor 229 is located downstream of the cooling fan 100 in the direction of flow of the cooling air F1 together with the prime mover 91.
As illustrated in FIG. 16, an accelerator lever (accelerator operation actuator) 232 that adjusts and sets a rotation speed of the prime mover 91 by an operator's manual operation is connected to the controller 231. Specifically, the accelerator lever 232 includes a detection sensor 233 such as a potentiometer that detects an operation position of the accelerator lever 232, and the detection sensor 233 is connected to the controller 231. Thus, the controller 231 can acquire the operation position (operation amount) of the accelerator lever 232. Additionally, a detection switch (sensor) 234 that detects whether a hydraulic actuator provided in the working machine 1 is actuated is connected to the controller 231. The detection switch 234 includes, for example, a pressure sensor that detects a circuit pressure of a hydraulic circuit that drives the hydraulic actuator, and detects whether the hydraulic actuator is actuated by detecting the circuit pressure. Thus, the controller 231 can acquire a detection signal indicating whether the hydraulic actuator provided in the working machine 1 is actuated.
The cable 230 that operably connects the AI motor 227 and the rotation speed governor 229 to each other has one end portion coupled to a drive body 235 that is driven by the AI motor 227, and another end portion coupled to a lever (referred to as a governor lever) 236 of the rotation speed governor 229. Specifically, the cable 230 includes an inner cable and an outer cable, one end portion of the inner cable is coupled to the drive body 235, and another end portion of the inner cable is coupled to the governor lever 236. The inner cable may be indirectly or directly coupled to the drive body 235 and the governor lever 236. The rotation speed of the prime mover 91 is determined by the position of the governor lever 236.
In the system illustrated in FIG. 16, when work is performed by the working machine 1, the accelerator lever 232 is operated to set a rotation speed of the prime mover 91 in a working state (usually, the accelerator lever 232 is set to the maximum operation position (full operation position) in many cases). When the accelerator lever 232 is operated, the operation position (operation amount) of the accelerator lever 232 is input to the controller 231, and a command signal is output from the controller 231 to the AI motor 227 to actuate the AI motor 227. For example, the inner cable of the cable 230 is pulled by the AI motor 227, and therefore the governor lever 236 swings. Also, the rotation angle of the AI motor 227 is detected by the angle detector 228, and the detection value of the angle detector 228 is input (fed back) to the controller 231. Accordingly, the governor lever 236 is moved by an amount corresponding to the operation amount of the accelerator lever 232, and the rotation speed of the prime mover 91 becomes the rotation speed corresponding to the operation amount of the accelerator lever 232.
When the detection switch 234 detects that the hydraulic actuator is actuated, the rotation speed of the prime mover 91 is maintained at the rotation speed set by the accelerator lever 232. In contrast, when the detection switch 234 detects that the hydraulic actuator is not actuated (the working machine 1 is not operated), the detection signal is output to the controller 231. Then, a command signal is output from the controller 231 to the AI motor 227, the AI motor 227 is returned, the governor lever 236 is returned by a return spring or the like, and the rotation speed of the prime mover 91 is automatically decreased to the idling rotation speed. That is, when the detection switch 234 detects that the hydraulic actuator is not actuated, the rotation speed of the prime mover 91 is decreased to the idling rotation speed while the accelerator lever 232 is kept set in the set operation position (full operation position). That is, at the time of no working (at the time of no load), the rotation speed of the prime mover 91 is decreased to the idling rotation speed while the accelerator lever 232 is kept set in the set operation position.
Thereafter, when the working machine 1 is operated and it is detected that the hydraulic actuator is actuated, a detection signal is output from the detection switch 234 to the controller 231, and a command signal is output from the controller 231 to the AI motor 227, so that the rotation speed of the prime mover 91 is controlled to be instantaneously automatically increased to the rotation speed corresponding to the operation amount of the accelerator lever 232.
That is, the controller 231 performs control such that when the working machine 1 is not operated, the rotation speed of the prime mover 91 is automatically decreased to the idling rotation speed even though the accelerator lever 232 is operated, and when the working machine 1 is operated, the rotation speed of the prime mover 91 is instantaneously increased to the rotation speed corresponding to the operation amount of the accelerator lever 232.
In the above-described configuration, the inner cable of the cable 230 is pulled by the AI motor 227 to increase the rotation speed of the prime mover 91, and the inner cable of the cable 230 is returned to decrease the rotation speed of the prime mover 91 to the idling rotation speed. However, this does not imply any limitation, and a configuration in which the inner cable of the cable 230 may be pulled by the AI motor 227 to decrease the rotation speed of the prime mover 91 to the idling rotation speed may be used. That is, it is sufficient that the rotation speed governor 229 is operated by the cable 230 to change the rotation speed of the prime mover 91.
As illustrated in FIG. 9, the cable 230 is guided from the AI motor 227 to the rotation speed governor 229 through a space below the radiator 92 (cooler), the oil cooler 93 (cooler), and the cooling fan 100. Specifically, as illustrated in FIG. 14, the cable 230 is guided in an inclination direction (front-down inclination direction) in which the cable 230 shifts downward as extending forward from the AI motor 227, then guided to a space below the battery 94 via the front of the battery 94, then inserted through an insertion portion 237 provided in a support plate 171 that supports the battery 94, and guided to the side where the prime mover 91 is present. As illustrated in FIG. 9, the cable 230 inserted through the insertion portion 237 is guided to the side where the prime mover 91 is located through an insertion cutout 238 in a partition plate 170 and a cutout portion 226 provided in the rear portion of the left vertical rib 224L. The cable 230 guided to the side where the prime mover 91 is located is guided rightward in front of a lower portion of the prime mover 91, turned back in front of the flywheel housing 199, guided leftward, and coupled to the governor lever 236.
As illustrated in FIG. 9, the outer cable of the cable 230 has another end portion attached to a bracket plate 239. The bracket plate 239 is attached to an attachment portion 240 provided on the prime mover 91. In the present embodiment, the attachment portion 240 includes a right surface of an injection pump 241.
As illustrated in FIG. 14, the support plate 171 that supports the battery 94 is fixed to a placement member 167 that supports the radiator 92 by a bolt 270. A battery support base 242 on which the battery 94 is placed is fixed to the support plate 171. A guide member 243 that guides the cable 230 is fixed to a front lower portion of the battery support base 242. The insertion portion 237 includes a cutout 244 that is in a middle portion in the front-rear direction of a lower portion of the support plate 171 and that is open downward, and a grommet 245 attached to an edge portion of the cutout 244.
As illustrated in FIG. 7, the placement member 167 is located below the radiator 92 and provided to extend between the partition wall body 150 and the first bracket member 151L. The placement member 167 is attached to bracket members fixed to the partition wall body 150 and the first bracket member 151L. The radiator 92 is supported in a vibration isolating manner by a vibration isolation member 168 provided on the placement member 167. Also, the radiator 92 is supported by the support frame 142 via a frame member 169 that is attached to the support frame 142.
The partition plate 170 provides partition between the partition wall body 150 and the first bracket member 151L below the placement member 167. The insertion cutout 238 in the partition plate 170 is open downward in a middle portion in the front-rear direction of a lower portion of the partition plate 170. The support plate 171 and the partition plate 170 provide partition between the swivel base plate 5 and the placement member 167 and between the partition wall body 150 and the first bracket member 151L, and the flow of the cooling air F1 from the side where the battery 94 is present to the side where the prime mover 91 is present is blocked.
As illustrated in FIGS. 11, 12, and 17, the AI motor 227 and the angle detector 228 are attached to the frame member 169. The frame member 169 includes a first frame 246 and a second frame 247.
As illustrated in FIGS. 11, 12, and 17, the first frame 246 includes a pair of front and rear vertical members 248 arranged with a space interposed therebetween in the front-rear direction, and a plurality of lateral members 249 arranged between the front and rear vertical members 248. As illustrated in FIG. 7, an attachment plate 250 is fixed to a lower portion of each vertical member 248, and an attached portion 92d provided at a lower portion of the radiator 92 is attached to the attachment plate 250 via a bolt 92e.
As illustrated in FIGS. 11, 12, and 17, the plurality of lateral members 249 include an upper lateral member 249A, a lower lateral member 249B, and an intermediate lateral member 249C. The upper lateral member 249A is located between upper portions of the pair of vertical members 248 and couples the pair of vertical members 248 to each other. As illustrated in FIG. 7, attached portions 92f provided on the upper portion of the radiator 92 are attached to a front portion and a rear portion of the upper lateral member 249A via bolts 92g. As illustrated in FIG. 18, an attachment portion 251 extending upward is provided at a rear portion of the upper lateral member 249A.
As illustrated in FIGS. 11, 12, and 17, the lower lateral member 249B is located between the lower portions of the pair of vertical members 248 and couples the pair of vertical members 248 to each other. A cable guide 252 that guides the cable 230 is fixed to a front portion of the lower lateral member 249B. The intermediate lateral member 249C is located between the upper lateral member 249A and the lower lateral member 249B and close to the upper lateral member 249A, and couples the pair of vertical members 248 to each other. An attachment member 253 is fixed to the intermediate lateral member 249C. As illustrated in FIG. 14, the oil cooler 93 is attached to the upper lateral member 249A and the intermediate lateral member 249C.
As illustrated in FIG. 18, the second frame 247 is made of a plate member, and has an upper wall portion 247a, a side wall portion 247b, an attached portion 247c, a first coupling wall portion 247d, a second coupling wall portion 247e, a third coupling wall portion 247f, and a cover attachment portion 247g. The upper wall portion 247a is positioned such that plate surfaces thereof face in the up-down direction, and attached to the support frame 142. Specifically, as illustrated in FIG. 12, a stay member 254 is fixed to a side surface of the rear portion of the first upper side frame portion 145L of the support frame 142, and the upper wall portion 247a is placed on the stay member 254 and fixed thereto by a bolt.
As illustrated in FIG. 18, the side wall portion 247b is positioned such that plate surfaces thereof face in the machine-body width direction, and arranged leftward of the upper wall portion 247a. A front portion of the AI motor 227 is located on a right side surface of an upper portion of the side wall portion 247b, and the front portion of the AI motor 227 is fixed to the side wall portion 247b by a bolt. Specifically, as illustrated in FIGS. 15 and 19, the AI motor 227 includes a motor main body 227b at a rear portion, a gear case 227c at a front portion, a gear speed reduction mechanism (not illustrated) housed inside the gear case 227c, and the output shaft 227a provided in the gear case 227c and having an axis extending in the machine-body width direction, and the gear case 227c is fixed to the side wall portion 247b by a bolt. The output shaft 227a rotates forward/backward about the axis.
As illustrated in FIG. 18, an insertion hole 255 is provided through the side wall portion 247b at an attachment section for the AI motor 227, and the output shaft 227a can protrude leftward from the side wall portion 247b via the insertion hole 255. A pair of upper and lower boss members 256 are fixed to a left side surface of the side wall portion 247b, and an attachment plate 260 is fixed to the pair of boss members 256 by bolts. The angle detector 228 is attached to the attachment plate 260 from the left. An insertion hole 257 is provided through the attachment plate 260, and an actuator 228a (see FIG. 19) can be attached to a main body portion of the angle detector 228 from the right via the insertion hole 257.
As illustrated in FIG. 18, a cable attachment body 258 and an attachment hole 259 are provided at a lower portion of the side wall portion 247b. The attachment hole 259 is provided above the cable attachment body 258. As illustrated in FIG. 24, the cable attachment body 258 includes a support rod 258A and an attachment stay 258B. The support rod 258A is made of a rod member, and has a first rod portion 258Aa extending in the front-rear direction and fixed to the lower portion of the side wall portion 247b, and a second rod portion 258Ab extending leftward from a front end of the first rod portion 258Aa. The attachment stay 258B has a first wall portion 258Ba fixed to the second rod portion 258Ab, and a second wall portion 258Bb to which the outer cable of the cable 230 is attached. The first wall portion 258Ba extends from the second rod portion 258Ab in a front-down inclination direction, and the second wall portion 258Bb extends from a lower end of the first wall portion 258Ba in a front-up inclination direction. The attachment hole 259 is a long hole that is long in the up-down direction. A bolt for fixing the side wall portion 247b to the attachment member 253 is inserted through the attachment hole 259.
As illustrated in FIG. 18, the attached portion 247c extends downward from a middle portion in the front-rear direction of the upper wall portion 247a. The attached portion 247c is fixed to the attachment portion 251 of the upper lateral member 249A by a bolt. A bolt insertion hole 251a in the attachment portion 251 is a long hole that is long in the up-down direction.
As illustrated in FIG. 18, the first coupling wall portion 247d couples a left end of the upper wall portion 247a and an upper end of the side wall portion 247b at a position located forward of the attached portion 247c. The second coupling wall portion 247e couples the left end of the upper wall portion 247a and the upper end of the side wall portion 247b at a position located rearward of the attached portion 247c. The first coupling wall portion 247d and the second coupling wall portion 247e are provided in an inclined manner to shift downward as extending leftward from the left end of the upper wall portion 247a. The third coupling wall portion 247f couples the attached portion 247c and the side wall portion 247b to each other.
As illustrated in FIG. 18, the cover attachment portion 247g is made of a plate member, and has a first wall 247g1 whose plate surfaces face in the up-down direction, and a second wall 247g2 extending downward from a rear end of the first wall 247g1. The cover attachment portion 247g is fixed to a left surface of an upper and front portion of the side wall portion 247b so as to protrude leftward. The cover attachment portion 247g is located forward of the attached portion 247c and rearward of the upper boss member 256.
As illustrated in FIGS. 19, 20, and 21, the gear case 227c of the AI motor 227 is located to face the angle detector 228 in the machine-body width direction, and the drive body 235 is provided between the gear case 227c and the angle detector 228. The drive body 235 includes a drive tube 261, an arm body 262, and a pushing piece 263. The drive tube 261 is made of a tube member and fitted to the output shaft 227a of the AI motor 227 so as to be rotatable together. Thus, the drive body 235 is driven by the AI motor 227. The arm body 262 includes an arm piece 262A fixed to an outer peripheral surface of the drive tube 261 so as to protrude radially outward, and a pin member 262B fixed to a protruding end of the arm piece 262A so as to extend in the machine-body width direction.
As illustrated in FIG. 21, the pin member 262B is engaged with a forked coupling tool 264 (see FIG. 24) fixed to the one end portion of the inner cable of the cable 230. Specifically, the pin member 262B is inserted through a long hole 264a in the coupling tool 264. Accordingly, the one end portion of the cable 230 is coupled to the drive body 235 that is driven by the AI motor 227. When the output shaft 227a of the AI motor 227 rotates in an arrow Y1 direction in FIG. 21, the cable 230 is pulled, and when the output shaft 227a rotates in the direction opposite to the arrow Y1 direction, the cable 230 is returned.
The pushing piece 263 is fixed to the outer peripheral surface of the drive tube 261 so as to protrude radially outward of the drive tube 261. The pushing piece 263 abuts on a rear surface in the arrow Y1 direction of the actuator 228a of the angle detector 228. Thus, when the output shaft 227a rotates in the arrow Y1 direction, the pushing piece 263 pushes the actuator 228a in the same direction as the arrow Y1 direction, and therefore the rotation angle of the AI motor 227 is detected. In contrast, when the output shaft 227a rotates in the direction opposite to the arrow Y1 direction, the actuator 228a follows the pushing piece 263 by a return spring (not illustrated).
As illustrated in FIG. 10, the third cover body 101C has the cutout portion 221e in the portion corresponding to the left manipulator 17L, and the cutout portion 221e is covered with the left manipulator 17L, but as illustrated in FIG. 3, a gap 265 is provided between a rear edge portion of the cutout portion 221e and the left manipulator 17L, and there is a possibility that a foreign object such as dust or stones intrudes the inside of the hood 14 (third cover body 101C) from the gap 265. When the foreign object that has intruded accumulates between the AI motor 227 and the angle detector 228, there is a possibility that the AI motor 227 and the angle detector 228 are not actuated normally.
Thus, as illustrated in FIGS. 22, 23, 24, and 25, the working machine 1 includes a cover 266 that protects the AI motor 227, the drive body 235, and the angle detector 228 from an external factor such as a foreign object that intrudes the inside of the hood 14.
As illustrated in FIGS. 22, 23, and 24, the cover 266 is made of a plate member and includes a first cover portion 267 and a second cover portion 268. The first cover portion 267 has an upper wall 267a, a front wall 267b, an intermediate wall 267c, and a side wall 267d. The upper wall 267a has plate surfaces facing in the up-down direction and is located above the angle detector 228 and the drive body 235. A rear portion of the upper wall 267a is attached to the first wall 247g1 of the cover attachment portion 247g. Specifically, the rear portion of the upper wall 267a is placed on the first wall 247g1 and attached to the first wall 247g1 by a bolt 269 that penetrates the upper wall 267a and the first wall 247g1 from above and is screwed into a nut member (not illustrated) provided on a lower surface of the first wall 247g1.
The front wall 267b has plate surfaces facing in the front-rear direction and is located forward of the angle detector 228 and the drive body 235. The intermediate wall 267c extends in an inclination direction to shift downward as extending forward from a front end of the upper wall 267a, and is connected to an upper end of the front wall 267b. The upper wall 267a, the front wall 267b, and the intermediate wall 267c are integrally provided by bending a plate member. Additionally, the first cover portion 267 has an extension portion 267e extending integrally rightward from a front and right portion of the upper wall 267a and from right portions of the front wall 267b and the intermediate wall 267c so as to overlap the side wall portion 247b of the second frame 247.
The side wall 267d is provided from a left portion of a lower surface of the upper wall 267a to a left portion of a lower surface of the intermediate wall 267c and a left portion of a rear surface of the front wall 267b, and fixed to the upper wall 267a, the intermediate wall 267c, and the front wall 267b.
The second cover portion 268 has a first wall 268a, a second wall 268b, a third wall 268c, and a fourth wall 268d. The first wall 268a is located in a front-down inclined manner at a position located obliquely forward and upward of the gear case 227c of the AI motor 227. Plate surfaces of the first wall 268a face in the up-down direction, in a direction orthogonal to the inclination direction of the first wall 268a. The second wall 268b extends rearward from an upper end in the inclination direction of the first wall 268a. The third wall 268c extends upward from a left end of the first wall 268a in a direction orthogonal to the plate surfaces of the first wall 268a, and is fixed to the extension portion 267e. As illustrated in FIG. 25, the fourth wall 268d extends leftward from a lower portion in the inclination direction of the first wall 268a and overlaps the extension portion 267e.
In a case of a working machine 1 of a model without a possibility that a foreign object such as dust or stones intrudes the installation location of the AI motor 227 and the angle detector 228, the cover 266 does not have to be provided, and can be omitted.
Also, in the present embodiment, the cover 266 has a structure that is attached to the second frame 247 of the frame member 169, but this does not imply any limitation, and the cover 266 may be attached to the hood 14. Alternatively, a bracket provided separately from the frame member 169 may be attached to the support frame, and the cover 266 may be attached to the bracket. Also, the shape of the cover 266 is not limited to that of the present embodiment, and can be variously changed.
As illustrated in FIG. 27, a controller (electronic control unit, ECU) 291 is located inside the hood 14. The controller 291 is a device that controls an electric device provided in the working machine 1, and for example, controls the rotation of the prime mover 91, controls a solenoid valve that actuates a control valve provided in the working machine 1, and the like. Also, the controller 291 includes, for example, a microcomputer including a central processing unit (CPU), an electrically erasable programmable read-only memory (EEPROM), and the like. As illustrated in FIGS. 32 and 33, the controller 291 is installed such that a connector 296 to which a harness is connected faces rightward.
As illustrated in FIGS. 27 and 31, the controller 291 is located below the right manipulator (manipulator) 17R. Also, the controller 291 is located sideward (rightward) of the second upper side frame portion 145R of the support frame 142.
As illustrated in FIG. 27, the controller 291 is located downstream of the prime mover 91 in the direction of flow of the cooling air F1. In other words, the controller 291 is located opposite to the coolers (the radiator 92 and the oil cooler 93) with respect to the prime mover 91. By arranging the controller 291 downstream of the prime mover 91 in the direction of flow of the cooling air F1, that is, opposite to the side where the coolers such as the radiator 92 and the oil cooler 93 are arranged, the installation location of the controller 291 can be ensured inside the hood 14 without the cooling performances of the coolers impaired. Also, the controller 291 is located above the muffler 200, the flywheel housing 199, and the hydraulic pump 95.
As illustrated in FIG. 30, the controller 291 is located below a rear portion of the right manipulator 17R. As illustrated in FIG. 28, the hydraulic fluid tank 97 is located below a front portion of the right manipulator 17R. That is, the controller 291 is located rearward of the hydraulic fluid tank 97. Specifically, the controller 291 is located rearward of an upper portion of the hydraulic fluid tank 97.
As illustrated in FIGS. 30 to 33, the controller 291 is supported by the support frame 142 via an attachment bracket 297. Specifically, as illustrated in FIG. 34, the attachment bracket 297 is made of a plate member, and has a placement wall 297a, an attachment wall 297b, and a reinforcing wall 297c. The placement wall 297a is positioned such that plate surfaces thereof face in the up-down direction. The attachment wall 297b extends upward from a left end of the placement wall 297a. The reinforcing wall 297c extends upward from a left portion of a rear end portion of the placement wall 297a.
The controller 291 is placed on the placement wall 297a and attached to the placement wall 297a by a bolt 298 and a nut (not illustrated). The attachment wall 297b is attached to the attachment member 295 by a bolt 299 and a nut 300 fixed to a left surface of the attachment member 295, while being superposed on a right surface of the attachment member 295 (see FIG. 48). That is, the attachment bracket 297 is attached to the support frame 142 via the attachment member 295.
As illustrated in FIGS. 30, 31, and 33, a cover member 301 is located above the controller 291. The cover member 301 covers the upper side of the controller 291 and receives an intrusion object (foreign object), for example, water such as rainwater or washing water, or dust or the like that intrudes from between the right manipulator 17R and the hood 14. The cover member 301 is made of a plate member. Also, as illustrated in FIG. 33, the cover member 301 covers the upper side of the connector 296 of the controller 291. Thus, the cover member 301 also covers a connection terminal of a harness connected to the connector 296.
As illustrated in FIGS. 35 and 36, the cover member 301 has a cover main body 301a and an extension wall 301b extending upward from a left end of the cover main body 301a. The cover member 301 is located above the controller 291 such that a plate surface of the cover main body 301a faces upward. The cover main body 301a is located above the controller 291 and receives the intrusion object. An upper surface of the cover main body 301a is a receiving surface that receives the intrusion object. Also, the cover member 301 is located above the controller 291 such that the cover main body 301a is inclined downward toward a position deviated from the controller 291 in the horizontal direction. In the present embodiment, as illustrated in FIG. 30, the cover member 301 is positioned in an inclined manner such that the cover main body 301a shifts downward as extending forward, and a front end of the cover main body 301a is located at a position deviated forward from the controller 291. Thus, the cover member 301 can move the received intrusion object forward of the controller 291 and drop the intrusion object forward of the controller 291.
The cover member 301 is not limited to be front-down inclined. For example, the cover member 301 may be rear-down inclined, right-down inclined, or left-down inclined. In short, it is sufficient that the cover member 301 is positioned such that the receiving surface is inclined downward toward a position deviated from the controller 291 in the horizontal direction.
As illustrated in FIGS. 35 and 36, an attached portion 302 and an abutted portion 303 are provided at a rear portion of the extension wall 301b. The abutted portion 303 is provided rearward of the attached portion 302. The abutted portion 303 is provided such that a portion of the plate member providing the cover member 301 is cut and raised. Also, the abutted portion 303 is provided by being bent leftward such that plate surfaces thereof face in the front-rear direction.
As illustrated in FIGS. 35 and 36, the cover member 301 (extension wall 301b) is attached to a frame 304 of the right manipulator 17R.
Here, the frame 304 of the right manipulator 17R will be described first.
As illustrated in FIGS. 35 to 39, the frame 304 of the right manipulator 17R includes a first side plate 305L, a second side plate 305R, an attachment base 306, a coupling plate 307, and an attachment plate 308. The first side plate 305L and the second side plate 305R are arranged with a space interposed therebetween in the machine-body width direction. The second side plate 305R is located rightward of the first side plate 305L. The attachment base 306 is located in a front portion between the first side plate 305L and the second side plate 305R and couples the first side plate 305L and the second side plate 305R to each other. The coupling plate 307 is located in a rear portion between the first side plate 305L and the second side plate 305R and couples the first side plate 305L and the second side plate 305R to each other. The attachment plate 308 is made of a plate member that is long in the front-rear direction, is located below the first side plate 305L such that plate surfaces thereof face in the up-down direction, and has a right portion fixed to a lower end of the first side plate 305L.
As illustrated in FIG. 37, the attachment plate 308 is superposed on an upper surface of the second upper side frame portion 145R and attached to the second upper side frame portion 145R by a bolt or the like. That is, the frame 304 is attached to the support frame 142.
As illustrated in FIG. 39, the attachment base 306 has an upper wall 306a, a front wall 306b, and a rear wall 306c. The upper wall 306a is located higher than the first side plate 305L and the second side plate 305R and arranged in a front-down inclined manner. The remote control valve 309 that is operated with the right manipulating lever 23R is attached to the upper wall 306a. The front wall 306b extends downward from a front end in the inclination direction of the upper wall 306a and couples the first side plate 305L and the second side plate 305R to each other. The rear wall 306c extends in a rear-down inclined manner from a rear end in the inclination direction of the upper wall 306a and couples the first side plate 305L and the second side plate 305R to each other. A seal abutting portion 306d is provided at a lower end portion of the rear wall 306c. The seal abutting portion 306d is provided between a right surface of a front end portion of the attachment plate 308 and an extension portion 305Ra provided in a middle portion in the front-rear direction of the second side plate 305R and extending downward.
As illustrated in FIG. 35, a support tube 310 that supports the dozer lever 35 is supported on a left surface of a front portion of the second side plate 305R via a support shaft 311 so as to be rotatable about an axis extending in the machine-body width direction. One end portion of an operation cable 313 is coupled to an arm 312 fixed to the support tube 310. Another end portion of the operation cable 313 is coupled to a control valve that controls the hydraulic cylinder that drives the dozer device 7 via an interlock mechanism.
As illustrated in FIGS. 30 and 35, the cover member 301 is located outward in the machine-body width direction of the second side plate 305R of the frame 304. Specifically, the cover member 301 is located rightward of a rear and lower portion of the second side plate 305R.
As illustrated in FIG. 36, the attached portion 302 of the cover member 301 is attached to the second side plate 305R by one bolt (attachment tool) 314. The second side plate 305R of the frame 304 serves as an attachment portion to which the cover member 301 is attached.
As illustrated in FIG. 37, the abutted portion 303 abuts on a lower portion of a rear end of the second side plate 305R. Thus, the lower portion of the rear end of the second side plate 305R serves as an abutting portion 315 on which the abutted portion 303 is abutted. The abutted portion 303 abuts on the abutting portion 315, so that the cover member 301 is restricted from rotating downward about the bolt (attachment tool) 314. Accordingly, the cover member 301 (cover main body 301a) is held so as to be inclined downward. The cover member 301 is attached by the one bolt, and the abutted portion 303 abuts on the abutting portion 315 of the frame 304 to prevent rotation, so that the cover member 301 can be easily attached in a predetermined inclined posture.
As illustrated in FIGS. 30, 31, and 32, the working machine 1 includes a heat shield body 316 that shields the controller 291 from heat transferred from the side where the prime mover 91 (the prime mover 91, the muffler 200, the hydraulic pump 95, and the like) is present. The heat shield body 316 covers the controller 291 from below and shields the controller 291 from heat such as the cooling air F1 (hot air), convection heat, and radiant heat transferred from the side where the prime mover 91 is present.
As illustrated in FIGS. 33, 40, 41, and 42, the heat shield body 316 includes a first constituent body 317 and a second constituent body 318. The first constituent body 317 and the second constituent body 318 are made of plate members.
As illustrated in FIG. 42, the first constituent body 317 has a first member 319, a second member 320, and a third member 321. The first member 319 has a first section 319a and a second section 319b.
As illustrated in FIG. 48, the first section 319a is located below the controller 291 such that plate surfaces thereof face in the up-down direction. The second section 319b extends in an inclination direction to shift upward as extending leftward from a left end of the first section 319a. An upper end in the inclination direction of the second section 319b is located at a left end portion of the lower surface of the second upper side frame portion 145R. The second section 319b blocks the flow of heat (hot air) from the left of the heat shield body 316 to the side where the controller 291 is present. A seal member 322 is interposed between an upper portion in the inclination direction of the second section 319b and the lower surface of the second upper side frame portion 145R. Additionally, a seal member (not illustrated) is interposed between the second upper side frame portion 145R and the upper wall 101Ab of the first cover body 101A, and configured to block heat (hot air) on the side where the prime mover 91 is present flowing to the side where the controller 291 is located beyond the second upper side frame portion 145R.
As illustrated in FIGS. 40, 41, and 42, the first member 319 includes an elastic plate member 323 made of an elastic member such as rubber. As illustrated in FIG. 48, the elastic plate member 323 has a circumferential groove in an outer peripheral portion thereof, and the circumferential groove of the elastic plate member 323 is fitted to an opening edge portion of an opening 324 in the plate member constituting a main body of the first member 319, thereby providing the elastic plate member 323 in the first section 319a. However, the elastic plate member 323 may be omitted.
As illustrated in FIG. 42, a cutout portion 325 is in a front portion of the first member 319. The cutout portion 325 is provided from an upper end of the second section 319b to a right portion of the first section 319a. Also, the first member 319 is provided with at least one engagement piece (referred to as a first engagement piece) 326. In the present embodiment, the at least one first engagement piece 326 includes a first engagement piece 326 provided at a front portion of the first section 319a and a first engagement piece 326 provided at a front portion of the second section 319b. That is, a pair of first engagement pieces 326 are provided. Alternatively, one or three or more first engagement pieces 326 may be provided. That is, it is sufficient that at least one first engagement piece 326 is provided. The first engagement piece 326 is fixed to an upper surface of the first member 319 by welding or the like, and protrudes forward from an edge portion of the cutout portion 325.
As illustrated in FIGS. 41 and 42, the second member 320 is superposed on a lower surface of the front portion of the first member 319 and fixed thereto by welding or the like. As illustrated in FIG. 42, the second member 320 protrudes from the edge portion of the cutout portion 325. In other words, the second member 320 has a protruding portion (referred to as a first protruding portion) 320a protruding forward from the front portion of the first member 319. Additionally, the second member 320 has a protruding portion (referred to as a second protruding portion) 320b protruding rightward from the front portion of the first member 319.
As illustrated in FIG. 40, the first member 319 is located rearward of the support member 293, and the front portion of the first member 319 is supported by the support member 293. Specifically, as illustrated in FIG. 46, the front portion of the first member 319 is supported by the support member 293 by a rear portion of the support member 293 being fitted between the first protruding portion 320a and the first engagement piece 326.
As illustrated in FIG. 42, the third member 321 is provided at a rear end portion of the first member 319 from the first section 319a to the second section 319b. Also, the third member 321 is vertically provided on the rear end portion of the first member 319. As illustrated in FIG. 33, the third member 321 is provided by being bent such that plate surfaces of a left portion thereof face in the front-rear direction and plate surfaces of a right portion thereof face obliquely forward and rightward. As illustrated in FIG. 40, a stay member 327 is fixed to a front surface of the left portion of the third member 321. As illustrated in FIG. 32, the stay member 327 has an attachment piece 327a, and the attachment piece 327a is attached to the attachment member 295 by a bolt 328 or the like at the rear of the attachment bracket 297.
As described above, a front portion of the first constituent body 317 is attached to the support member 293, and a rear portion of the first constituent body 317 is attached to the attachment member 295 via the stay member 327. Accordingly, the first constituent body 317 (heat shield body 316) is attached to the support frame 142. The first constituent body 317 may have an attachment portion other than the above-described attachment portion. For example, the upper portion in the inclination direction of the second section 319b may be attached to a stay member fixed to the second upper side frame portion 145R.
As illustrated in FIG. 40, a grommet 329 is provided on the right portion of the third member 321. The grommet 329 allows a harness that is connected to the connector 296 of the controller 291 to pass therethrough. The grommet 329 is fitted into a cutout portion 330 (see FIG. 49) in the third member 321.
As illustrated in FIG. 42, a seal member 331 is attached to an upper portion of the third member 321. The seal member 331 is provided on a portion (referred to as a first portion) 321a located rightward of the attachment piece 327a of the stay member 327. A portion (referred to as a second portion) 321b of the third member 321 located leftward of the attachment piece 327a is lower than the first portion 321a. As illustrated in FIG. 41, the second portion 321b is located below the second upper side frame portion 145R and abuts on the lower surface of the second upper side frame portion 145R. As illustrated in FIG. 40, a left end of the first portion 321a abuts on a right surface of the second upper side frame portion 145R.
As illustrated in FIGS. 46 and 49, a left portion of the seal member 331 abuts on a lower surface of the rear wall portion 101Ab1 of the upper wall 101Ab of the first cover body 101A. As illustrated in FIG. 46, the seal member 331 abuts from the lower surface of the rear wall portion 101Ab1 to an inner surface of the fourth cover body 101D.
As illustrated in FIG. 42, the second constituent body 318 has a first member 332, a second member 333, and a third member 334. As illustrated in FIG. 48, the first member 332 is located below the controller 291 and rightward of the first section 319a of the first constituent body 317 such that plate surfaces thereof face in the up-down direction.
As illustrated in FIGS. 40 and 42, the first member 332 is provided with at least one engagement piece (referred to as a second engagement piece) 335. In the present embodiment, the at least one second engagement piece 335 includes second engagement pieces 335 provided at a front portion and a rear portion of a left portion of the first member 332. That is, a pair of second engagement pieces 335 are provided. Alternatively, one or three or more second engagement pieces 335 may be provided. That is, it is sufficient that at least one second engagement piece 335 is provided.
The second engagement piece 335 is fixed to an upper surface of the first member 332 by welding or the like. Also, the second engagement piece 335 protrudes leftward from a left end edge portion of the first member 332. The first member 332 is placed on the second protruding portion 320b of the first constituent body 317, and the second engagement piece 335 is placed on the first section 319a of the first constituent body 317.
As illustrated in FIGS. 41 and 48, the first member 332 of the second constituent body 318 is joined to the first member 319 of the first constituent body 317 by at least one joining tool 336. The at least one joining tool 336 includes a pair of front and rear joining tools 336. Each joining tool 336 includes a first joining tool 336A, a second joining tool 336B, and a fastening tool 336C. The first joining tool 336A is fixed to a lower surface of the first section 319a of the first constituent body 317. The second joining tool 336B is fixed to a lower surface of the first member 332 of the second constituent body 318. The first joining tool 336A and the second joining tool 336B are superposed in the machine-body width direction and fastened by the fastening tool 336C including a bolt and a nut.
The first section 319a of the first constituent body 317 and the first member 332 of the second constituent body 318 block the flow of heat (hot air) from below the heat shield body 316 to the side where the controller 291 is present.
As illustrated in FIG. 48, the first section 319a of the first constituent body 317 and the first member 332 of the second constituent body 318 are arranged below the attachment bracket 297 with a space interposed in the up-down direction. In other words, the attachment bracket 297 is located at a distance from the heat shield body 316. Accordingly, heat can be prevented from being transferred from the heat shield body 316 to the attachment bracket 297 by thermal conduction, and therefore heat can be prevented from being transferred to the controller 291.
As illustrated in FIG. 40, a grommet 337 is provided at a front and left portion of the first member 332 of the second constituent body 318. The grommet 337 allows the operation cable 313, which is located from the side where the dozer lever 35 is present, to pass through a space below the heat shield body 316.
As illustrated in FIGS. 42 and 47, the first member 332 of the second constituent body 318 has an extension portion 332a extending upward at a left portion of a rear end portion thereof. The grommet 329 is prevented from being detached by the extension portion 332a. Also, a seal member 338 is attached to an upper portion of the extension portion 332a.
As illustrated in FIGS. 33 and 42, the second member 333 is provided from a front portion of a left end portion of the first member 332 to the extension portion 332a, and vertically provided on the first member 332. The second member 333 is provided along an inner surface shape of a rear and upper portion of the fourth cover body 101D. A seal member 339 is attached to an upper portion of the second member 333.
As illustrated in FIGS. 47 and 48, the seal member 338 attached to the extension portion 332a of the first member 332 and the seal member 339 attached to the upper portion of the second member 333 abut on the inner surface of the fourth cover body 101D.
The second member 333 and the seal member 339 block the flow of heat (hot air) from the right of the heat shield body 316 to the side where the controller 291 is present.
Also, a rear portion of the second member 333, the seal member 339, the extension portion 332a, the seal member 338, the third member 321, and the seal member 331 block the flow of heat (hot air) from the rear of the heat shield body 316 to the side where the controller 291 is present.
As illustrated in FIGS. 40 and 42, the third member 334 is made of a plate member that is long in the machine-body width direction, and vertically provided on a front end of the first member 332. A right end portion of the third member 334 abuts on a front end portion of the second member 333 and is fixed to the second member 333 by welding or the like.
As illustrated in FIGS. 28, 43, and 44, the third member 334 is located at a position corresponding to an upper portion of a rear surface of the hydraulic fluid tank 97. A rectangular plate-shaped seal member 340 is provided on the upper portion of the rear surface of the hydraulic fluid tank 97. The third member 334 abuts on the seal member 340 from the rear in a surface contact manner. Accordingly, heat from the side where the prime mover 91 is present is prevented from flowing from the front of the second constituent body 318 to the side where the controller 291 is present. Also, a seal member 341 is provided on a right side surface of the hydraulic fluid tank 97 so as to be interposed between the right side surface and the inner surface of the fourth cover body 101D. The seal member 341 prevents heat (hot air) from the side where the prime mover 91 is present from passing through between the right side surface of the hydraulic fluid tank 97 and the inner surface of the fourth cover body 101D and flowing upward of the hydraulic fluid tank 97.
As illustrated in FIG. 45, a seal structural body 342 is provided at a front portion of a left side surface of the hydraulic fluid tank 97. The seal structural body 342 includes a plurality of seal members 342A, 342B, 342C, and 342D. The seal member 342A abuts on a right end portion of the partition member 292. The seal member 342B and the seal member 342C abut on an upper portion of a right end portion of the partition wall body 150. Also, the seal member 342C is located on an upper portion of a hose clamp 343 attached to the partition member 292, and the seal member 342D abuts on a front portion of the hose clamp 343.
As illustrated in FIG. 32, the seal member 294 attached to the upper portion of the partition member 292 is located rightward of the front portion of the second upper side frame portion 145R, and as illustrated in FIG. 39, the seal member 294 abuts on a left surface of the extension portion 305Ra of the second side plate 305R of the frame 304 and a lower surface of the seal abutting portion 306d of the attachment base 306. Thus, the seal member 294 abuts on the lower surface of the seal abutting portion 306d of the attachment base 306 between the second upper side frame portion 145R and the extension portion 305Ra of the second side plate 305R.
The hydraulic fluid tank 97, the seal structural body 342, the partition member 292, the seal member 294, the frame 304, and the like block the flow of heat (hot air) from the front of the heat shield body 316 to the side where the controller 291 is present.
As described above, it is possible to block the heat (hot air) on the side where the prime mover 91 is present flowing to the side where the controller 291 is present from the periphery of the heat shield body 316.
A heat insulating member (not illustrated) is attached to surfaces of the heat shield body 316 that face the prime mover 91, such as a lower surface, a rear surface, a left surface, and the like, of the heat shield body 316.
Example embodiments of the present invention provide working machines 1 described in the following items.
(Item 1) A working machine 1 including a machine body 2, a hood 14 to cover a prime mover 91 provided in the machine body 2, and an electrical device 227 provided inside the hood 14, wherein the hood 14 includes an outside air intake port 89 to allow cooling air F1 for cooling the prime mover 91 to pass into the hood 14, and the electrical device 227 is located in a vicinity of the outside air intake port 89 such that the electrical device 227 is covered with the hood 14.
With the working machine 1 according to item 1, the electrical device 227 is located in the vicinity of the outside air intake port 89 inside the hood 14 such that the electrical device 227 is covered with the hood 14, and therefore the durability of the electrical device 227 can be enhanced.
(Item 2) The working machine 1 according to item 1, further including a cooling fan 100 to generate the cooling air F1, and at least one cooler (radiator 92, oil cooler 93) located upstream of the cooling fan 100 in a direction of flow of the cooling air F1, wherein the electrical device 227 is located between the outside air intake port 89 and the cooling fan 100 in plan view, and a half or more of a projected area of the electrical device 227 is located higher than an upper end portion of the outside air intake port 89 in side view.
With the working machine 1 according to item 2, even when the electrical device 227 is provided in the vicinity of the outside air intake port 89, it is possible to eliminate or reduce the likelihood that the cooling air F1 will be blocked from passing through the cooler.
(Item 3) The working machine 1 according to item 2, wherein the electrical device 227 is positioned such that a half or more of the projected area of the electrical device 227 is located higher than an upper end of a blade 100B of the cooling fan 100.
With the working machine 1 according to item 3, it is possible to eliminate or reduce the likelihood that the cooling air F1 will be stopped from passing through the cooler (radiator 92).
(Item 4) The working machine 1 according to item 2 or 3, wherein the at least one cooler includes a radiator 92, the radiator 92 includes an upper tank 92a at an upper portion, a lower tank 92b at a lower portion, and a core portion 92c provided between the upper tank 92a and the lower tank 92b, and the electrical device 227 is located upstream of the radiator 92 in the direction of flow of the cooling air F1 such that the electrical device 227 faces the upper tank 92a.
With the working machine 1 according to item 4, it is possible to eliminate or reduce the likelihood that the electrical device 227 will block the cooling air F1 from passing through the radiator 92.
(Item 5) The working machine 1 according to any one of items 2 to 4, wherein the at least one cooler includes a plurality of coolers, the plurality of coolers include a first cooler (radiator 92) and a second cooler (oil cooler 93) arranged along the direction of flow of the cooling air F1, the second cooler 93 is located upstream of the first cooler 92 in the direction of flow of the cooling air F1 such that the second cooler 93 is lower than an upper end of the first cooler 92, and the electrical device 227 is located above the second cooler 93 such that the electrical device 227 faces an upper portion of the first cooler 92.
With the working machine 1 according to item 5, in the working machine 1 including the first cooler 92 and the second cooler 93 arranged in the direction of the cooling air F1, it is possible to eliminate or reduce the likelihood that the cooling air F1 will be blocked from passing through the first cooler 92 and the second cooler 93.
(Item 6) The working machine 1 according to item 5, wherein the first cooler is a radiator 92, and the second cooler is an oil cooler 93.
With the working machine 1 according to item 6, it is possible to eliminate or reduce the likelihood that the cooling air F1 will be blocked from passing through the radiator 92 and the oil cooler 93.
(Item 7) The working machine 1 according to any one of items 2 to 6, further including a rotation speed governor 229 provided in or on the prime mover 91 or in a vicinity of the prime mover 91 to adjust a rotation speed of the prime mover 91, and a cable 230 to operably connect the rotation speed governor 229 and the electrical device 227 to each other, wherein the prime mover 91 and the rotation speed governor 229 are located downstream of the cooling fan 100 in the direction of flow of the cooling air F1, the electrical device 227 is located upstream of the at least one cooler in the direction of flow of the cooling air F1, and the cable 230 is guided from the electrical device 227 to the rotation speed governor 229 through a space below the at least one cooler and the cooling fan 100.
With the working machine 1 according to item 7, the cable 230 can be guided without hindering the assembly of other members.
(Item 8) The working machine 1 according to any one of items 1 to 7, further including an intake pipe 173 to supply air to the prime mover 91, wherein the intake pipe 173 is located farther away from the outside air intake port 89 than the electrical device 227 in side view such that the intake pipe 173 is covered with the hood 14.
With the working machine 1 according to item 8, the leakage of suction noise generated by the intake pipe 173 to the outside of the hood 14 can be prevented or reduced.
(Item 9) The working machine 1 according to any one of items 1 to 8, further including a cover 266 to protect the electrical device 227.
With the working machine 1 according to item 9, the electrical device 227 can be protected from external factors.
(Item 10) The working machine 1 according to any one of items 1 to 9, wherein the electrical device 227 is an auto-idle motor to automatically reduce a rotation speed of the prime mover 91 toward an idling rotation speed when a hydraulic actuator provided in the working machine 1 is not actuated.
With the working machine 1 according to item 10, the auto-idle motor 227 can be properly positioned inside the hood 14.
(Item 11) The working machine 1 according to any one of items 1 to 10, further including a manipulator 17R located above the hood 14, and a controller 291 located below the manipulator 17R and inside the hood 14.
With the working machine 1 according to item 11, the controller 291 is located below the manipulator 17R and inside the hood 14, and therefore the installation location of the controller 291 can be ensured inside the hood 14 without impairing the cooling performance of the cooler.
(Item 12) A working machine 1 comprising a machine body 2, a prime mover 91 provided in the machine body 2, a hood 14 to cover the prime mover 91, a manipulator 17R located above the hood 14, and a controller 191 located below the manipulator 17R and inside the hood 14.
With the working machine 1 according to item 12, the controller 291 is located below the manipulator 17R and inside the hood 14, and therefore the installation location of the controller 291 can be ensured inside the hood 14 without impairing the cooling performance of the cooler.
(Item 13) The working machine 1 according to item 11 or 12, further including a cover member 301 to cover an upper side of the controller 291.
With the working machine 1 according to item 13, the controller 291 can be protected from external factors from above.
(Item 14) The working machine 1 according to item 13, wherein the cover member 301 is located above the controller 291 to receive an intrusion object intruding through a gap between the manipulator 17R and the hood 14.
With the working machine 1 according to item 14, the controller 291 can be protected from an intrusion object intruding through a gap between the manipulator 17R and the hood 14.
(Item 15) The working machine 1 according to item 13 or 14, wherein the cover member 301 is positioned such that the cover member 301 is inclined downward toward a position deviated from the controller 291 in a horizontal direction.
With the working machine 1 according to item 15, a foreign object on the cover member 301 can be removed to a position deviated from the controller 291.
(Item 16) The working machine 1 according to item 15, further including an attachment portion (second side plate 305R) to attach the cover member 301 thereto, and an attachment tool (bolt 314) to attach the cover member 301 to the attachment portion 305R, wherein the attachment portion 305R includes an abutting portion 315, the cover member 301 includes an abutted portion 303, and the abutted portion 303 is configured to abut on the abutting portion 315 to restrict rotation of the cover member 301 about the attachment tool 314 and hold the cover member 301 such that the cover member 301 is inclined downward.
With the working machine 1 according to item 16, the cover member 301 can be easily attached in a downward inclined manner.
(Item 17) The working machine 1 according to any one of items 11 to 16, further including a cooling fan 100 to generate cooling air F1 for cooling the prime mover 91, and a cooler (radiator 92, oil cooler 93) located upstream of the prime mover 91 in a direction of flow of the cooling air F1, wherein the controller 291 is located downstream of the prime mover 91 in the direction of flow of the cooling air F1.
With the working machine 1 according to item 17, the cooling performance of the cooler can be prevented from being impaired by the controller 291.
(Item 18) The working machine 1 according to item 17, further including a hydraulic pump 95 to be driven by the prime mover 91, wherein the controller 291 is located above the hydraulic pump 95.
With the working machine 1 according to item 18, the cooling performance of the cooler can be prevented from being impaired by the controller 291.
(Item 19) The working machine 1 according to item 17, further including a muffler 200 to receive exhaust gas guided from the prime mover 91, and the controller 291 is located above the muffler 200.
With the working machine 1 according to item 19, the cooling performance of the cooler can be prevented from being impaired by the controller 291.
(Item 20) The working machine 1 according to any one of items 11 to 19, further including a heat shield body 316 to shield the controller 291 from heat transferred from a side where the prime mover 91 is present.
With the working machine 1 according to item 20, it is possible to prevent or reduce the influence of the heat from the side where the prime mover 91 is present on the controller 291.
(Item 21) The working machine 1 according to item 20, further including an attachment bracket 297 to attach the controller 291 thereto, wherein the attachment bracket 297 is located at a distance from the heat shield body 316.
With the working machine 1 according to item 21, heat can be prevented from being transferred from the heat shield body 316 to the attachment bracket 297 by thermal conduction, and therefore heat can be prevented from being transferred to the controller 291.
(Item 22) The working machine 1 according to item 21, further including a support frame 142 vertically provided on the machine body 2 inside the hood 14 to support the hood 14, wherein the attachment bracket 297 is attached to the support frame 142.
With the working machine 1 according to item 22, the controller 291 can be firmly supported.
While embodiments of the present invention have been described above, it is to be understood that the embodiments disclosed herein are considered as examples in all aspects and are not considered as limitations. The scope of the present invention is to be determined not by the foregoing description but by the claims, and is intended to include all variations and modifications within the scope of the claims and their equivalents.

Reference Signs List

1: working machine
2: machine body
14: hood
17R: manipulator
89: outside air intake port
91: prime mover
92: cooler (radiator)
92a: upper tank
92b: lower tank
92c: core portion
93: cooler (oil cooler)
100: cooling fan
100B: blade
142: support frame
173: intake pipe
227: electrical device (auto-idle motor)
229: rotation speed governor
230: cable
266: cover
291: controller
297: attachment bracket
301: cover member
303: abutted portion
305R: attachment portion (second side plate)
314: attachment tool (bolt)
315: abutting portion
316: heat shield body
F1: cooling air

Claims

A working machine comprising:
a machine body;

a hood to cover a prime mover provided in the machine body; and

an electrical device provided inside the hood; wherein

the hood includes an outside air intake port to allow cooling air for cooling the prime mover to pass into the hood; and

the electrical device is located in a vicinity of the outside air intake port such that the electrical device is covered with the hood.
The working machine according to claim 1, further comprising:
a cooling fan to generate the cooling air; and

at least one cooler located upstream of the cooling fan in a direction of flow of the cooling air; wherein

the electrical device is located between the outside air intake port and the cooling fan in plan view, and a half or more of a projected area of the electrical device is located higher than an upper end portion of the outside air intake port in side view.
The working machine according to claim 2, wherein the electrical device is positioned such that a half or more of the projected area of the electrical device is located higher than an upper end of a blade of the cooling fan.
The working machine according to claim 2 or 3, wherein
the at least one cooler includes a radiator;

the radiator includes an upper tank at an upper portion, a lower tank at a lower portion, and a core portion provided between the upper tank and the lower tank; and

the electrical device is located upstream of the radiator in the direction of flow of the cooling air such that the electrical device faces the upper tank.
The working machine according to any one of claims 2 to 4, wherein
the at least one cooler includes a plurality of coolers;

the plurality of coolers include a first cooler and a second cooler arranged along the direction of flow of the cooling air;

the second cooler is located upstream of the first cooler in the direction of flow of the cooling air such that the second cooler is lower than an upper end of the first cooler; and

the electrical device is located above the second cooler such that the electrical device faces an upper portion of the first cooler.
The working machine according to claim 5, wherein
the first cooler is a radiator; and

the second cooler is an oil cooler.
The working machine according to any one of claims 2 to 6, further comprising:
a rotation speed governor provided in or on the prime mover or in a vicinity of the prime mover to adjust a rotation speed of the prime mover; and

a cable to operably connect the rotation speed governor and the electrical device to each other; wherein

the prime mover and the rotation speed governor are located downstream of the cooling fan in the direction of flow of the cooling air;

the electrical device is located upstream of the at least one cooler in the direction of flow of the cooling air; and

the cable is guided from the electrical device to the rotation speed governor through a space below the at least one cooler and the cooling fan.
The working machine according to any one of claims 1 to 7, further comprising:
an intake pipe to supply air to the prime mover; wherein

the intake pipe is located farther away from the outside air intake port than the electrical device in side view such that the intake pipe is covered with the hood.
The working machine according to any one of claims 1 to 8, further comprising a cover to protect the electrical device.
The working machine according to any one of claims 1 to 9, wherein the electrical device is an auto-idle motor to automatically reduce a rotation speed of the prime mover toward an idling rotation speed when a hydraulic actuator provided in the working machine is not actuated.
The working machine according to any one of claims 1 to 10, further comprising:
a manipulator located above the hood; and

a controller located below the manipulator and inside the hood.
A working machine comprising:
a machine body;

a prime mover provided in the machine body;

a hood to cover the prime mover;

a manipulator located above the hood; and

a controller located below the manipulator and inside the hood.
The working machine according to claim 11 or 12, further comprising a cover member to cover an upper side of the controller.
The working machine according to claim 13, wherein the cover member is located above the controller to receive an intrusion object intruding through a gap between the manipulator and the hood.
The working machine according to claim 13 or 14, wherein the cover member is positioned such that the cover member is inclined downward toward a position deviated from the controller in a horizontal direction.
The working machine according to claim 15, further comprising:
an attachment portion to attach the cover member thereto; and

an attachment tool to attach the cover member to the attachment portion; wherein

the attachment portion includes an abutting portion;

the cover member includes an abutted portion; and

the abutted portion is configured to abut on the abutting portion to restrict rotation of the cover member about the attachment tool and hold the cover member such that the cover member is inclined downward.
The working machine according to any one of claims 11 to 16, further comprising:
a cooling fan to generate cooling air for cooling the prime mover; and

a cooler located upstream of the prime mover in a direction of flow of the cooling air; wherein

the controller is located downstream of the prime mover in the direction of flow of the cooling air.
The working machine according to claim 17, further comprising:
a hydraulic pump to be driven by the prime mover; wherein

the controller is located above the hydraulic pump.
The working machine according to claim 17, further comprising:
a muffler to receive exhaust gas guided from the prime mover; wherein

the controller is located above the muffler.
The working machine according to any one of claims 11 to 19, further comprising a heat shield body to shield the controller from heat transferred from a side where the prime mover is present.
The working machine according to claim 20, further comprising:
an attachment bracket to attach the controller thereto; wherein

the attachment bracket is located at a distance from the heat shield body.
The working machine according to claim 21, further comprising:
a support frame vertically provided on the machine body inside the hood to support the hood; wherein

the attachment bracket is attached to the support frame.