Working machine

Abstract

To provide a work machine allowing a plurality of electric parts to be efficiently placed using the fewer number of parts in a limited space in an engine room.SOLUTION: A hydraulic shovel as a work machine is provided with an engine room and an electric part mount substrate placed in the engine room, on which at least a first electric part and a second electric part are mounted. The first electric part is mounted on either one of a front surface and a rear surface of the electric part mount substrate. The second electric part is mounted on the other of the front surface and the rear surface of the electric part mount substrate.SELECTED DRAWING: Figure 3

Description

Technical Field

[0001] The present invention relates to a work machine provided with an engine room.

Background Art

[0002] Conventionally, a technique of arranging a plurality of controllers in an engine room of a hydraulic excavator has been proposed. For example, in Patent Document 1, a plurality of controllers are fixed to a mounting plate, the mounting plate is fixed to a housing to form a controller housing device, and this controller housing device is arranged in the engine room.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In the technique of Patent Document 1, when arranging a plurality of controllers, which are electrical components, in the engine room, it is necessary to use a mounting plate and a housing, and the number of parts is large. Therefore, in the case of a small hydraulic excavator or the like where the engine room is a particularly narrow space, it is impossible to efficiently arrange a plurality of electrical components in the limited space.

[0005] The present invention has been made to solve the above problems, and an object thereof is to provide a work machine capable of efficiently arranging a plurality of electrical components with a small number of parts in a limited space in the engine room.

Means for Solving the Problems

[0006] A work machine according to one aspect of the present invention is a work machine including an engine room, and includes an electrical component mounting board disposed in the engine room and having at least a first electrical component and a second electrical component mounted thereon. The first electrical component is mounted on either the front or back surface of the electrical component mounting board, and the second electrical component is mounted on the other of the front and back surfaces of the electrical component mounting board.

Effect of the Invention

[0007] According to the above configuration, a plurality of electrical components can be efficiently arranged with a small number of component parts in the limited space in the engine room.

Brief Description of the Drawings

[0008]

Figure 1

Figure 2

Figure 3

Figure 4

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Figure 6

Figure 7

Figure 8

Figure 9

Figure 10

Figure 11

Figure 12

Figure 13

Embodiments for Carrying out the Invention

[0009] The embodiments of the present invention will be described as follows with reference to the drawings.

[0010] 〔1. Working Machine〕 FIG. 1 is a side view showing a schematic configuration of a hydraulic excavator 1 which is an example of the working machine of the present embodiment. The hydraulic excavator 1 includes a lower traveling body 2, a working device 3, and an upper revolving body 4.

[0011] Here, in FIG. 1, the directions are defined as follows. First, the direction in which the lower traveling body 2 travels straight is defined as the front-rear direction, and one side thereof is defined as "front" and the other side is defined as "rear". In FIG. 1, as an example, the side of the blade 23 with respect to the travel motor 22 is shown as "front". Also, the lateral direction perpendicular to the front-rear direction is defined as the left-right direction. At this time, the left side is defined as "left" and the right side is defined as "right" when viewed from the operator sitting on the operator's seat 41a. Further, the direction of gravity perpendicular to the front-rear direction and the left-right direction is defined as the up-down direction, the upstream side in the direction of gravity is defined as "up", and the downstream side is defined as "down".

[0012] The lower traveling body 2 is driven by receiving power from the engine 40 and makes the hydraulic excavator 1 travel. The lower traveling body 2 includes a pair of left and right crawlers 21 and a pair of left and right traveling motors 22. Each traveling motor 22 is a hydraulic motor. By driving the left and right crawlers 21 with the left and right traveling motors 22 respectively, the hydraulic excavator 1 can move forward and backward. A blade 23 for performing leveling work is provided on the lower traveling body 2. The blade 23 is driven by a blade cylinder (not shown). The blade cylinder is a hydraulic cylinder that rotates the blade 23 in the vertical direction.

[0013] The working machine 3 is driven by receiving power from the engine 40 and performs excavation work such as digging earth and sand. The working machine 3 includes a boom 31, an arm 32, and a bucket 33. By driving the boom 31, the arm 32, and the bucket 33 independently, excavation work can be performed.

[0014] The boom 31 is rotated by a boom cylinder 31a. The base end of the boom cylinder 31a is supported by the front part of the upper slewing body 4 and is movable in a telescopic manner. The arm 32 is rotated by an arm cylinder 32a. The base end of the arm cylinder 32a is supported by the tip of the boom 31 and is movable in a telescopic manner. The bucket 33 is rotated by a bucket cylinder 33a. The base end of the bucket cylinder 33a is supported by the tip of the arm 32 and is movable in a telescopic manner. The boom cylinder 31a, the arm cylinder 32a, and the bucket cylinder 33a are constituted by hydraulic cylinders.

[0015] The upper slewing body 4 is configured to be slewing - capable with respect to the lower traveling body 2 via a slewing bearing (not shown). In the upper slewing body 4, a cab 41, a slewing frame 42, a slewing motor 43, an engine room 44, etc. are arranged. That is, the hydraulic excavator 1 includes at least the engine room 44. The upper slewing body 4 slews via the slewing bearing by the drive of the slewing motor 43 which is a hydraulic motor. At the rear of the upper slewing body 4, in addition to the engine 40 that provides power to each part, a plurality of hydraulic pumps (not shown) driven by the engine 40 are arranged.

[0016] Each hydraulic pump supplies hydraulic oil (pressure oil) to hydraulic motors (for example, left and right travel motors 22 and swing motor 43) and hydraulic cylinders (for example, blade cylinder 23a, boom cylinder 31a, arm cylinder 32a, bucket cylinder 33a). Hydraulic motors and hydraulic cylinders that are driven by the supply of hydraulic oil from an arbitrary hydraulic pump are collectively referred to as hydraulic actuators.

[0017] A cab 41 on which an operator rides is provided with a driver's seat 41a. An operation unit 41b is arranged around the driver's seat 41a (especially in the front, left, and right).

[0018] The operation unit 41b is composed of operation levers, switches, buttons, etc. for driving the hydraulic actuator. When the operator sits on the driver's seat 41a and operates the operation unit 41b, the hydraulic actuator is driven. Thereby, the lower traveling body 2 can travel, the blade 23 can perform leveling work, the work implement 3 can perform excavation work, crane work, the upper swing body 4 can swing, and so on.

[0019] FIG. 2 is a perspective view of the hydraulic excavator 1 from the rear. A counterweight 45 is provided at the lower rear of the upper swing body 4. The counterweight 45 is positioned adjacent to the side frame 46 in the swing direction. The side frame 46 stands up from the left and right side portions of the swing frame 42 (see FIG. 1). A bonnet 47 is positioned on the upper portions of the counterweight 45 and the side frame 46. The bonnet 47 includes a left bonnet 47L and a right bonnet 47R positioned on the left and right sides of the upper swing body 4, and a rear bonnet 47B positioned at the rear of the upper swing body 4. That is, the hydraulic excavator 1 includes a bonnet 47 (for example, left bonnet 47L) positioned at the side portion of (at least) the engine room 44. Each bonnet 47 is detachably provided with respect to the frame of the upper swing body 4.

[0020] Figure 3 is a perspective view showing the inside of the engine room 44 of the upper revolving body 4. The engine room 44 is composed of a space surrounded by the slewing frame 42 and the seat mount 48, and the counterweight 45, the side frame 46, and the bonnet 47 shown in Figure 2. The slewing frame 42 is located at the bottom of the engine room 44. The seat mount 48 is a base on which the seat of the driver's seat 41a (see Figure 1) is installed and is located above the slewing frame 42. That is, the hydraulic excavator 1 includes the slewing frame 42 located at the bottom of the engine room 44 and the seat mount 48 located above the slewing frame 42 and forming part of the outer wall of the engine room 44.

[0021] The above-described engine 40 is installed as a prime mover in the engine room 44. That is, the hydraulic excavator 1 includes a prime mover (engine 40) installed in the engine room 44. Note that the prime mover is not limited to the engine 40 and may be, for example, an electric motor. Further, the prime mover may be composed of both the engine 40 and an electric motor.

[0022] [2. Regarding the electrical component mounting board] As shown in Figure 3, an electrical component mounting board 100 is arranged in the engine room 44. In particular, in the present embodiment, the electrical component mounting board 100 is arranged facing the left bonnet 47L (see Figure 2) located on the side of the engine room 44. Electrical components are mounted on the electrical component mounting board 100. Examples of the above-described electrical components include an integrated controller (integrated ECU) that controls the entire hydraulic excavator 1, a controller (engine ECU) that controls the engine 40, and electrical components such as relays. Note that an ECU is a controller called an Electronic Control Unit.

[0023] Here, for the purpose of distinguishing each electrical component, the integrated ECU is referred to as the first electrical component 101 (see Figure 3), and the engine ECU is referred to as the second electrical component 102 (see Figure 6). In this case, it can be said that the hydraulic excavator 1 includes the electrical component mounting board 100 on which at least the first electrical component 101 and the second electrical component 102 are mounted.

[0024] FIG. 4 is a perspective view of the electrical component mounting substrate 100 as viewed from the mounting side of the first electrical component 101. FIG. 5 is a perspective view of the electrical component mounting substrate 100 alone. FIG. 6 is a perspective view of the electrical component mounting substrate 100 as viewed from the mounting side of the second electrical component 102. As shown in these figures, the first electrical component 101 is mounted on the surface 100a, which is one surface of the electrical component mounting substrate 100, using bolts 101a and nuts (not shown). The bolt 101a is inserted into the mounting hole 100c1 (see FIG. 5) provided in the electrical component mounting substrate 100 from the surface 100a side and screwed into the inner peripheral surface of the nut located on the back surface 100b side.

[0025] The second electrical component 102 is mounted on the back surface 100b, which is the other surface of the electrical component mounting substrate 100, using bolts 102a and nuts (not shown). The bolt 102a is inserted into the mounting hole 100c2 (see FIG. 5) provided in the electrical component mounting substrate 100 from the back surface 100b side and screwed into the inner peripheral surface of the nut located on the surface 100a side. Although not shown, the first electrical component 101 may be mounted on the back surface 100b of the electrical component mounting substrate 100 using bolts or the like, and the second electrical component 102 may be mounted on the surface 100a of the electrical component mounting substrate 100 using bolts or the like.

[0026] Therefore, in the present embodiment, it can be said that the first electrical component 101 is mounted on either one of the surface 100a and the back surface 100b of the electrical component mounting substrate 100, and the second electrical component 102 is mounted on the other one of the surface 100a and the back surface 100b of the electrical component mounting substrate 100.

[0027] In this configuration, a plurality of electrical components (first electrical component 101, second electrical component 102) are collectively mounted on a single electrical component mounting board 100. Therefore, even if the engine room 44 is a narrow space, a plurality of electrical components can be efficiently arranged in the limited narrow space with a small number of components using one electrical component mounting board 100. Therefore, the configuration using the electrical component mounting board 100 described above is very effective when arranging a plurality of electrical components in the engine room 44, particularly in a hydraulic excavator 1, which is a small work machine with a narrow internal space in the engine room 44.

[0028] Also, as shown in FIG. 3, the first electrical component 101 mounted on the electrical component mounting board 100 is located in the engine room 44 between the left bonnet 47L (see FIG. 2) located on the side of the engine room 44 and the electrical component mounting board 100. Although not shown, the second electrical component 102 mounted on the electrical component mounting board 100 may be located between the left bonnet 47L and the electrical component mounting board 100 in the engine room 44.

[0029] Therefore, in the present embodiment, it can be said that either the first electrical component 101 or the second electrical component 102 is located between the left bonnet 47L located on the side of the engine room 44 and the electrical component mounting board 100 in the engine room 44.

[0030] FIG. 7 is a perspective view from the rear of the hydraulic excavator 1 with the left bonnet 47L removed. FIG. 8 is a perspective view from the rear of the hydraulic excavator 1 with the cover member 104 (details will be described later) removed from the electrical component mounting board 100. For example, when the first electrical component 101 is located between the left bonnet 47L and the electrical component mounting board 100 in the engine room 44, by removing the left bonnet 47L (see FIG. 7) and then removing the exposed cover member 104, an operator (maintenance person) can easily access the first electrical component 101 (see FIG. 8). Even when the second electrical component 102 is located between the left bonnet 47L and the electrical component mounting board 100 in the engine room 44, the operator can easily access the second electrical component 102 by the same process as described above.

[0031] Therefore, the operator can perform inspections, confirmations, etc. of the electrical components located on the left bonnet 47L side (with the electrical component mounting substrate 100 installed in the engine room 44) just by removing the left bonnet 47L, that is, without taking out the electrical component mounting substrate 100 from the engine room 44. As a result, maintenance of the above electrical components can be easily performed.

[0032] Also, in the configuration where the electrical component mounting substrate 100 is arranged facing the left bonnet 47L in the engine room 44, the electrical component mounting substrate 100 is arranged vertically in the engine room 44. That is, the front surface 100a and the back surface 100b of the electrical component mounting substrate 100 are parallel in the vertical direction. With such a vertical arrangement of the electrical component mounting substrate 100, the vertically long and narrow space near the left bonnet 47L in the engine room 44 can be effectively utilized. That is, the first electrical component 101 and the second electrical component 102 can be efficiently arranged together with the electrical component mounting substrate 100 in the above narrow space in the engine room 44.

[0033] Also, in the present embodiment, as described above, the first electrical component 101 is an integrated ECU, and the second electrical component 102 is an engine ECU. The first electrical component 101 is located on the left bonnet 47L side with respect to the electrical component mounting substrate 100, and the second electrical component 102 is located on the side opposite to the left bonnet 47L with respect to the electrical component mounting substrate 100. That is, among the first electrical component 101 and the second electrical component 102, the electrical component located on the side opposite to the left bonnet 47L with respect to the electrical component mounting substrate 100 is a controller (engine ECU) that controls the engine 40 as a prime mover.

[0034] In this arrangement, the distance between the engine 40 as a prime mover arranged inside the engine room 44 and the second electrical component 102 which is a controller for controlling the engine 40 becomes shorter, for example, compared to the configuration where the second electrical component 102 is located on the left bonnet 47L side with respect to the electrical component mounting substrate 100. Thereby, the wiring (harness) drawn from the second electrical component 102 toward the engine 40 can be shortened, and thereby the routing of the wiring can be made easier.

[0035] [3. Mounting Method of Electrical Component Mounting Substrate] As shown in FIGS. 4 to 6, through holes 100h are formed in the peripheral portion of the electrical component mounting substrate 100. In these figures, three through holes 100h are formed along the edge of the electrical component mounting substrate 100, but the number of through holes 100h is not particularly limited.

[0036] On the other hand, FIG. 9 is a perspective view showing an enlarged view of the inside of the engine room 44 with the electrical component mounting substrate 100 installed. FIG. 10 is a perspective view showing an enlarged view of the inside of the engine room 44 with the electrical component mounting substrate 100 removed. As shown in FIG. 10, a bracket 49 is fixed to the engine room 44 side of the seat mount 48 by welding or the like. The bracket 49 is formed in a shape (for example, an L shape) along the unevenness of the seat mount 48 that constitutes the upper wall and the front wall of the engine room 44, and is fixed to the back side of the seat mount 48 (the side opposite to the seat mounting side). In the bracket 49, an insertion hole 49a is formed at a position corresponding to the through hole 100h of the electrical component mounting substrate 100.

[0037] The through hole 100h of the electrical component mounting substrate 100 with the first electrical component 101 and the second electrical component 102 mounted on the front and back is overlapped with the insertion hole 49a of the bracket 49, and a bolt 50 (see FIG. 9) as a fastening member is inserted into the through hole 100h and the insertion hole 49a in order, and screwed into the inner peripheral surface of a nut (not shown) located at the exit of the insertion hole 49a. Thereby, the electrical component mounting substrate 100 is fixed to the back side of the seat mount 48 via the bracket 49. As a result, the electrical component mounting substrate 100 is positioned closer to the seat mount 48 between the swivel frame 42 (see FIG. 3) and the seat mount 48. That is, the electrical component mounting substrate 100 is located at the upper part in the engine room 44. When removing the electrical component mounting substrate 100, the electrical component mounting substrate 100 can be easily removed from the seat mount 48 (bracket 49) by loosening the bolt 50 and releasing the connection with the nut.

[0038] Incidentally, when rainwater during rainy days and washing water during car washing (hereinafter referred to as rainwater, etc.) enters the interior of the engine room 44 from the gaps in the outer wall of the engine room 44 (for example, the gap between the left bonnet 47L and the rear bonnet 47B), the rainwater, etc. flows downward inside the engine room 44. As described above, in the configuration where the electrical component mounting board 100 is located closer to the seat mount 48 inside the engine room 44, that is, in the configuration where the electrical component mounting board 100 is located at the upper part inside the engine room 44, it is possible to reduce the risk that rainwater, etc. entering the engine room 44 from below (for example, from the side) above the electrical component mounting board 100 will have an adverse effect on the plurality of electrical components mounted on the electrical component mounting board 100. For example, it is possible to reduce the risk that the plurality of electrical components will be damaged (malfunction) by the above rainwater, etc.

[0039] Note that the fixing position of the electrical component mounting board 100 on the seat mount 48 may be only the part of the seat mount 48 that constitutes the upper wall of the engine room 44, or may be only the part of the seat mount 48 that constitutes the front wall of the engine room 44. That is, the electrical component mounting board 100 may be supported from above, from the front (sideways), or from both above and the front inside the engine room 44.

[0040] In any case, it is desirable that the electrical component mounting board 100 is arranged in a vertical direction with respect to the horizontal portion 48a (see FIGS. 9 and 10) that constitutes a part of the ceiling of the engine room 44 on the seat mount 48. In this configuration, even if rainwater, etc. enters the engine room 44 and touches the electrical component mounting board 100, the rainwater, etc. will fall along the electrical component mounting board 100. For this reason, it is possible to suppress the accumulation of rainwater, etc. on the electrical component mounting board 100, and it is possible to surely reduce the risk that the plurality of electrical components will be damaged by the rainwater, etc.

[0041] Further, the hydraulic excavator 1 includes a bracket 49 fixed to the seat mount 48. And the electrical component mounting board 100 is detachably fixed to the bracket 49 (using bolts 50 and nuts).

[0042] Since the electrical component mounting substrate 100 is fixed to the seat mount 48 via the bracket 49, it becomes easy to fix the electrical component mounting substrate 100 to the back side (engine room 44 side) of the seat mount 48 regardless of the uneven shape of the seat mount 48. Also, if the operator removes the left bonnet 47L, the operator can release the fixing of the electrical component mounting substrate 100 to the bracket 49 and take out the electrical component mounting substrate 100 from the engine room 44. As a result, the operator can access an electrical component (for example, the second electrical component 102) that was located farther from the left bonnet 47L with respect to the electrical component mounting substrate 100 among the first electrical component 101 and the second electrical component 102, and it becomes possible to perform maintenance on the above electrical component. In addition, it is of course possible for the operator to perform maintenance on the other electrical component (the first electrical component 101) after taking out the electrical component mounting substrate 100 from the engine room 44.

[0043] [4. Configuration Considering Cooling Efficiency of Electrical Components] As shown in FIGS. 4 to 6, the electrical component mounting substrate 100 has a substrate opening 100p. The substrate opening 100p is an opening formed to penetrate the electrical component mounting substrate 100 in the thickness direction. The substrate opening 100p is formed, for example, in a rectangular shape in plan view, but may be formed in a polygonal shape other than a rectangle, or may be formed in a shape such as a circle or an ellipse.

[0044] The first electrical component 101 and the second electrical component 102 are each mounted on the electrical component mounting substrate 100 so as to cover a part of the substrate opening 100p. That is, a part of the substrate opening 100p is located between the first electrical component 101 and the second electrical component 102.

[0045] In this configuration, air (e.g., cooling air) in the engine room 44 can be directed at both the first electrical component 101 and the second electrical component 102 mounted on the electrical component mounting substrate 100 from the mounting side of the electrical components (the electrical component mounting substrate 100 side) through the substrate opening 100p. Also, the heat generated by both the first electrical component 101 and the second electrical component 102 can be released to the outside through the substrate opening 100p. As a result, the cooling efficiency (heat dissipation efficiency) of both the first electrical component 101 and the second electrical component 102 can be increased.

[0046] FIG. 11 is a side view of the electrical component mounting substrate 100 with the first electrical component 101 and the second electrical component 102 mounted thereon. In the present embodiment, the second electrical component 102 is mounted on the electrical component mounting substrate 100 via a pillar 103. The pillar 103 is constituted by, for example, a nut. A bolt 102a for attaching the second electrical component 102 is inserted into the pillar 103, inserted into the mounting hole 100c2 (see FIG. 5) of the electrical component mounting substrate 100, and screwed into the inner peripheral surface of a nut (not shown) located on the first electrical component 101 side with respect to the electrical component mounting substrate 100, whereby the second electrical component 102 is fixed to the electrical component mounting substrate 100 via the pillar 103.

[0047] Note that the first electrical component 101 may be mounted on the electrical component mounting substrate 100 via a pillar (not shown). In this case, a bolt 101a (see FIG. 4) for attaching the first electrical component 101 is inserted into the above pillar, inserted into the mounting hole 100c1 (see FIG. 5) of the electrical component mounting substrate 100, and screwed into the inner peripheral surface of a nut (not shown) located on the second electrical component 102 side with respect to the electrical component mounting substrate 100, whereby the first electrical component 101 is fixed to the electrical component mounting substrate 100 via the above pillar.

[0048] Therefore, in the present embodiment, it can be said that at least one of the first electrical component 101 and the second electrical component 102 may be mounted on the electrical component mounting substrate 100 via a pillar (e.g., pillar 103).

[0049] In this configuration, a gap corresponding to the height of the pillar (for example, pillar 103) can be secured between the electrical component mounting substrate 100 and the electrical component (for example, the second electrical component 102). Then, cooling air can be applied to the electrical component through the gap. Also, the heat generated in the electrical component can be released to the outside through the gap. As a result, the cooling efficiency of the electrical component can be enhanced.

[0050] Note that the height of the pillar defines the gap between the electrical component mounting substrate 100 and the electrical component. The higher the height of the pillar, the larger the gap, and as a result, the cooling efficiency improves. As the nut constituting the pillar, nuts of any height can be used, but from the viewpoint of the above-described improvement in cooling efficiency, it is desirable to use a tall nut (high nut) as the nut.

[0051] It is desirable that a vibration-proof member such as a vibration-proof rubber be provided between the pillar 103 and the electrical component (for example, the second electrical component 102). In this case, the vibration generated in the hydraulic excavator 1 and transmitted to the electrical component through the electrical component mounting member 100 and the pillar 103 can be absorbed by the vibration-proof member. Thereby, damage to the electrical component due to the vibration can be reduced.

[0052] 〔5. Regarding the cover member〕 FIG. 12 is a perspective view of the cover member 104 in a state of being attached to the electrical component mounting substrate 100. Further, FIG. 13 is a perspective view of the cover member 104 in a state of being separated from the electrical component mounting substrate 100. The cover member 104 protects the first electrical component 101 by covering the first electrical component 101 with respect to the electrical component mounting substrate 100.

[0053] The cover member 104 is attached to the electrical component mounting substrate 100 using the spacer 105. The spacer 105 is, for example, a hollow member. A hole portion 104a into which a bolt (not shown) is inserted is formed at a predetermined position in the cover member 104. Also, a hole portion (not shown) is formed in the electrical component mounting substrate 100 corresponding to the position of the hole portion 104a of the cover member 104. By inserting the bolt into the hole portion 104a of the cover member 104, the spacer 105, and the hole portion of the electrical component mounting substrate 100 in this order and screwing it into the inner peripheral surface of a nut (not shown) located on the side of the second electrical component 102 of the electrical component mounting substrate 100, the cover member 104 is attached to the electrical component mounting substrate 100.

[0054] Note that another cover member that covers the second electrical component 102 may be provided on the electrical component mounting substrate 100. Therefore, it can be said that the hydraulic excavator 1 of the present embodiment may include a cover member (for example, the cover member 104) that individually covers at least one of the first electrical component 101 and the second electrical component 102 with respect to the electrical component mounting substrate 100. Hereinafter, the details of the cover member 104 that covers the first electrical component 101 will be described, but the configuration of the cover member 104 is also applicable to the cover member that covers the second electrical component 102.

[0055] The cover member 104 has a first flat plate portion 111 and a second flat plate portion 112. The first flat plate portion 111 and the second flat plate portion 112 are located on the same plane and are connected in the vertical direction. Note that the first flat plate portion 111 is located above the second flat plate portion 112. The first flat plate portion 111 and the second flat plate portion 112 are located facing the electrical component mounting substrate 100.

[0056] The first flat plate portion 111 has an upper end portion 111a and side end portions 111b. The upper end portion 111a and the side end portions 111b are connected to a side wall 113. The end portion of the side wall 113 on the side opposite to the first flat plate portion 111 can be in contact with the electrical component mounting substrate 100.

[0057] The second flat part 112 has a lower end part 112a and side end parts 112b. However, side walls corresponding to the side wall 113 of the above-described first flat part 111 are not connected to the lower end part 112a and the side end parts 112b. For this reason, when the cover member 104 is attached to the electrical component mounting substrate 101, a gap S (see FIG. 12) corresponding to the height of the side wall 113 of the first flat part 111 (the height in the direction in which the first flat part 111 and the electrical component mounting substrate 100 face each other) is formed between the lower end part 112a and the side end parts 112b of the second flat part 112 and the electrical component mounting substrate 100.

[0058] Note that side walls corresponding to the side wall 113 of the first flat part 111 may be formed on the side end parts 112b of the second flat part 112 and connected to the side wall 113. In this case, when the cover member 104 is attached to the electrical component mounting substrate 101, a gap S corresponding to the height of the side wall 113 of the first flat part 111 is formed between the lower end part 112a of the second flat part 112 and the electrical component mounting substrate 100.

[0059] In any case, it can be said that the cover member 104 has a lower end part 112a facing the electrical component mounting substrate 100 with the gap S therebetween.

[0060] In the above configuration of the cover member 104, even when rainwater or the like enters the engine room 44, the rainwater or the like flows downward through the gap S between the lower end part 112a of the cover member 104 and the electrical component mounting substrate 100. Thereby, it is possible to avoid a situation where rainwater or the like accumulates inside the cover member 104 and the electrical component (for example, the first electrical component 101) is damaged. That is, the electrical component can be protected from rainwater or the like. Further, cooling air can be applied to the electrical component covered by the cover member 104 through the gap S, and the heat generated by the electrical component can be released to the outside through the gap S. Thereby, the cooling efficiency of the electrical component can also be increased.

[0061] 〔6. Others〕 In this embodiment, an example in which the electrical component mounting board 100 is arranged vertically in the engine room 44 has been described, but it may be arranged horizontally. Even in this case, there is no change in that a plurality of electrical components can be collectively mounted on one electrical component mounting board 100 and arranged in the engine room 44. Therefore, the same effect as that of this embodiment, that is, a plurality of electrical components can be efficiently arranged in the engine room 44 with a small number of parts using one electrical component mounting board 100, can be obtained.

[0062] In this embodiment, as a working machine, the hydraulic excavator 1 which is a construction machine has been described as an example, but the working machine is not limited to the hydraulic excavator 1, and may be other construction machines such as a wheel loader, or may be agricultural machines such as a combine and a tractor.

[0063] As described above, the embodiments of the present invention have been described, but the scope of the present invention is not limited thereto, and it can be implemented with expansion or modification without departing from the gist of the invention.

Industrial Applicability

[0064] The present invention can be used for working machines such as construction machines and agricultural machines.

Explanation of Signs

[0065] 1 Hydraulic excavator (working machine) 40 Engine (prime mover) 42 Swing frame 44 Engine room 48 Seat mount 48a Horizontal part 49 Bracket 74L Left bonnet (bonnet) 100 Electrical component mounting board 100a Surface 100b Back surface 100p Board opening 101 First electrical component 102 Second electrical component 103 Pillar 104 Cover member The lower end of 112a S gap

Claims

1. A work machine comprising an upper wall and a front wall that cover the engine in the engine room from above, a seat mount on which a driver's seat is installed, a bonnet that covers the cutout side of the seat mount to form the side portion of the engine room, and an electrical component mounting board that is disposed in the engine room and to which at least a first electrical component and a second electrical component are mounted. The work machine, wherein the electrical component mounting board faces the engine, faces the bonnet, and is disposed on the back side of the seat mount.

2. The work machine according to claim 1, wherein the electrical component mounting board is disposed along the outer edge of the cutout side of the seat mount covered by the bonnet.

3. The work machine according to claim 1 or 2, wherein the electrical component mounting board is disposed on the back side of the upper wall via a bracket fixed to the back side of the seat mount.

4. The work machine according to any one of claims 1 to 3, wherein the electrical component mounting board is disposed in a direction perpendicular to a horizontal portion that forms a part of the ceiling of the engine room in the seat mount.

5. The work machine further comprising an operation lever disposed above the seat mount on the side of the driver's seat, wherein the electrical component mounting board is disposed behind the operation lever.

6. A work machine including an engine room, comprising an electrical component mounting board that is disposed in the engine room and to which at least a first electrical component and a second electrical component are mounted, wherein the first electrical component is mounted on either the front surface or the back surface of the electrical component mounting board, the second electrical component is mounted on the other of the front surface or the back surface of the electrical component mounting board, and the work machine further comprising a bonnet located at the side portion of the engine room, a swing frame located at the bottom of the engine room, and a seat mount located above the swing frame and forming a part of the outer wall of the engine room, wherein the electrical component mounting board is supported by the seat mount from above and in front and is disposed facing the bonnet.

7. The work machine according to claim 6, wherein an edge of the electrical component mounting board is fixed to the seat mount via a bracket.

8. The work machine according to claim 7, wherein the bracket is formed in a shape that follows the unevenness on the back side of the seat mount and is fixed to the back side of the seat mount.

9. In the seat mount, below the horizontal portion constituting a part of the ceiling of the engine room, the electrical component mounting board is disposed behind the seat mount and faces the bonnet, the working machine according to any one of claims 6 to 8.

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