Work machine

Abstract

To provide a working machine in which a casing can be interposed between a battery and a rear protective member even if the battery size is increased.SOLUTION: The counter weight 20 has the facing surface 32f that is the front surface 32 facing the box 30 in the front-rear direction, at least one of the end portion 32f and the 36R at the left end and the right end of the facing surface 36L is located forward of the central portion 32f in the left-right direction of the facing surface 36M, and at least one of the thickness THl in the front-rear direction at the left end of the box 30 and the thickness THr in the front-rear direction at the right end of the box 30 is smaller than the thickness THm of the central portion.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to a work machine powered by electric power supplied from a battery. [Background technology]

[0002] There are known work machines that use electricity supplied from a battery as a power source. The electric construction machine described in Patent Document 1 is an example of such a machine. In the technology described in Patent Document 1, the battery is mounted rearward of the center of the vehicle body in the longitudinal direction, and a sensor box (housing) is sandwiched in the space between the battery and a rear cover (rear protective member) located at the rear end of the vehicle body. The sensor box houses various electrical components. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 7156878 Summary of the Invention [Problem to be solved by the invention]

[0004] In Patent Document 1, if an attempt is made to ensure battery capacity, the battery size increases, and the proportion of the space occupied by the battery in the rear of the vehicle increases. Furthermore, in the construction machine of Patent Document 1, the left and right ends of the rear cover are located further forward than the center, further limiting the space between the battery and the rear cover. As a result, it may be difficult to interpose a sensor box (housing) between the battery and the rear protection member.

[0005] The present disclosure has been made to solve the above-mentioned problems, and its purpose is to provide a work machine that can interpose a housing between the battery and the rear protective member even if the battery size is large. [Means for solving the problem]

[0006] A work machine according to a first aspect comprises a battery mounted on a vehicle body, a rear protective member disposed at the rear end of the vehicle body, and a housing interposed between the battery and the rear protective member, wherein the rear protective member has an opposing surface which is the front surface facing the housing in the fore-and-aft direction of the vehicle body, and at least one of the left and right ends of the opposing surface is located forward of the left-to-right center of the opposing surface, and at least one of the front-to-back thicknesses of the housing at the left end and the right end is thinner than the thickness of the left-to-right center.

[0007] According to the first aspect, the thickness of the housing in the front-to-rear direction is such that at least one of the thickness at the left end of the housing and the thickness at the right end of the housing is thinner than the thickness at the center in the left-to-right direction. Therefore, even if the battery size becomes large, the space formed between the battery and the rear protective member can be effectively utilized, and the housing can be interposed between the battery and the rear protective member.

[0008] It is desirable that the work machine according to the second aspect, in addition to the work machine according to the first aspect, further include the following feature: That is, in the work machine according to the second aspect, the opposing surface is positioned more forward as it moves from the central portion toward at least one of the ends. According to the second aspect, even if the opposing surface is formed so as to be positioned more forward as it moves from the central portion toward at least one of the ends, at least one of the front-to-rear thicknesses of the left end and the right end of the housing is thinner than the thickness of the central portion in the left-to-right direction, so that the housing can be interposed between the battery and the rear protection member.

[0009] It is desirable that the work machine according to the third aspect be the work machine according to the first aspect, further comprising the following feature: That is, in the work machine according to the third aspect, the opposing surface is positioned more forward from the center portion toward the left end, and more forward from the center portion toward the right end. According to the third aspect, even when the opposing surface is positioned more forward from the center portion toward both the left and right ends, at least one of the front-to-rear thicknesses of the left end and the right end of the housing is thinner than the thickness of the center portion in the left-to-right direction, so that the housing can be interposed between the battery and the rear protection member.

[0010] It is desirable that the work machine according to the fourth aspect be the work machine according to any one of the first to third aspects, further comprising the following feature: In other words, in the work machine according to the fourth aspect, the housing is supported by the battery or a support member interposed between the battery and the housing, and the rear wall of the housing is removable. According to the fourth aspect, by removing the rear wall while the housing is supported by the battery or the support member, maintenance on the inside of the housing can be easily performed.

[0011] A work machine according to a fifth aspect is preferably the work machine according to any one of the first to fourth aspects, further comprising the following feature: In other words, in the work machine according to the fifth aspect, the casing has a middle section located in the center in the left-right direction of the body, a left section located to the left of the middle section, and a right section located to the right of the middle section, and the left section decreases in thickness toward the left in the left-right direction of the body, and the right section decreases in thickness more than the middle section toward the right in the left-right direction of the body. According to the fifth aspect, even if both left and right ends of the opposing surface are located further forward from the center section toward the left and right ends, the casing can be interposed between the battery and the rear protection member.

[0012] The work machine according to the sixth aspect is preferably the work machine according to the fifth aspect, further comprising the following feature: In other words, in the work machine according to the sixth aspect, a plurality of electrical components are housed inside the casing, and the electrical component having the longest dimension in the front-to-rear direction among the plurality of electrical components is disposed in the intermediate section. According to the sixth aspect, by disposing the electrical component having the longest dimension in the front-to-rear direction among the electrical components in the intermediate section of the casing, even a component having a long dimension in the front-to-rear direction can be housed within the casing. [Effects of the Invention]

[0013] According to the present disclosure, a work machine can be provided in which a housing can be interposed between a battery and a rear protective member even if the battery size increases and the space between the battery and the rear protective member is limited. [Brief explanation of the drawings]

[0014] [Figure 1] 1 is a side view of a hydraulic excavator, which is a work machine according to an embodiment of the present invention. [Figure 2] FIG. 2 is a perspective view of the upper rotating body of the hydraulic excavator as viewed from the right rear. [Figure 3] FIG. 2 is a top view of the junction box as seen vertically from above. [Figure 4] FIG. 10 is a rear view showing the interior of the box with the rear wall of the box removed. [Figure 5] FIG. 10 is a rear view of the battery unit and the box seen from the rear. [Figure 6] FIG. 2 is a perspective view of the battery unit and the box as viewed from the right rear. [Figure 7] FIG. 2 is a perspective view of the battery unit and the box as viewed from the left rear. DETAILED DESCRIPTION OF THE INVENTION

[0015] Hereinafter, embodiments of the present disclosure will be described with reference to the drawings.

[0016] [Overall structure] 1 is a side view of a hydraulic excavator 1, which is a work machine according to one embodiment of the present disclosure. The hydraulic excavator 1 includes a lower traveling structure 10 capable of traveling on the ground G, an upper rotating structure 12 (vehicle body) mounted on the lower traveling structure 10 so as to be rotatable about a rotation center axis Cs extending in the vertical direction, and a work implement 14 mounted on the upper rotating structure 12.

[0017] The lower traveling body 10 includes a pair of right crawlers 11R and left crawlers 11L disposed on the right and left, respectively. The right crawlers 11R and left crawlers 11L operate so that the lower traveling body 10 travels on the ground G.

[0018] The upper rotating body 12 includes a rotating frame 16 and multiple elements mounted thereon. The multiple elements include a cab 18 serving as an operator's compartment, a battery unit 19 (battery) that supplies power to an electric motor (not shown) and the like, and a counterweight 20 disposed at the rear end of the upper rotating body 12. The counterweight 20 is an example of a rear protection member of the present disclosure.

[0019] The work implement 14 includes a boom 21, an arm 22, and a bucket 24. The boom 21 is supported at the front end of the swivel frame 16 so as to be able to be raised and lowered. The arm 22 is connected to the tip of the boom 21 so as to be able to rotate up and down relative to the boom 21. The bucket 24 is a tip attachment for performing excavation work and the like, and is attached to the tip of the arm 22 so as to be able to rotate up and down relative to the arm 22. The cab 18 is located at the front end of the upper rotating body 12, on the left side of the work implement 14. However, the cab 18 may also be located on the right side of the work implement 14.

[0020] The hydraulic excavator 1 further has a boom cylinder 26, an arm cylinder 27, and a bucket cylinder 28. The boom cylinder 26 extends and retracts to rotate the boom 21 in the hoisting direction. The arm cylinder 27 extends and retracts to rotate the arm 22. The bucket cylinder 28 extends and retracts to rotate the bucket 24 relative to the arm 22. These cylinders are composed of hydraulic cylinders.

[0021] Fig. 2 is a perspective view of the upper rotating body 12 as seen from the right rear, and Fig. 3 is a top view of a junction box 30 (described later) disposed at the rear of the battery unit 19 as seen from vertically above. In the following, the left-right direction refers to the left-right direction of the upper rotating body 12, and the front-rear direction refers to the front-rear direction of the upper rotating body 12. The junction box 30 is an example of a housing of the present disclosure.

[0022] The battery unit 19 is mounted on the upper rotating body 12. Specifically, the battery unit 19 is disposed in the center of the upper rotating body 12 in the left-right direction and at the rear in the front-rear direction.

[0023] The counterweight 20 is disposed at the rear end of the upper rotating body 12. The counterweight 20 may be formed substantially symmetrically about the center of the upper rotating body 12 in the left-right direction. Alternatively, the counterweight 20 may be formed in an arc shape centered on the central axis Cs of rotation of the upper rotating body 12. In this case, both the front surface 32 located at the front side in the fore-and-aft direction of the counterweight 20 and the rear surface 34 located at the rear side are formed in an arc shape when viewed vertically from above.

[0024] A space S is formed between the battery unit 19 and the counterweight 20. This space S houses a junction box 30, which is a housing for a relay that distributes power. In other words, the junction box 30 is interposed between the battery unit 19 and the counterweight 20 in the front-to-rear direction. The junction box 30 houses multiple electrical components, including a contactor 60, a fuse 62, and a bus bar 64 (see FIG. 4). Hereinafter, the junction box 30 will be abbreviated to box 30.

[0025] The box 30 is formed in a rectangular shape when viewed from the rear of the upper rotating body 12. Specifically, the longitudinal direction of the box 30 is aligned with the left-right direction of the upper rotating body 12, and the lateral direction is aligned with the up-down direction. The box 30 also has a predetermined thickness TH in the front-rear direction of the upper rotating body 12.

[0026] A portion 30U of the lower part of the box 30 is disposed below the upper surface 20a of the counterweight 20. In other words, when the box 30 and the counterweight 20 are viewed from the rear of the upper rotating body 12, a portion 30U of the box 30 overlaps with the counterweight 20 in the vertical direction.

[0027] Furthermore, the left end 36L and the right end 36R in the left-right direction of an opposing surface 32f of the front surface 32 of the counterweight 20 that faces the box 30 are located further forward than a central portion 36M in the left-right direction of the opposing surface 32f. Specifically, the opposing surface 32f is located further forward from the central portion 36M toward the left end 36L, and further forward from the central portion 36M toward the right end 36R.

[0028] The left end 36L is a portion of the front surface 32 that coincides with the left end of the box 30 in the left-right direction, and corresponds to the left end of the opposing surface 32f. Similarly, the right end 36R is a portion of the front surface 32 that coincides with the right end of the box 30 in the left-right direction, and corresponds to the right end of the opposing surface 32f. The central portion 36M corresponds to a portion of the front surface 32 that coincides with or approximately coincides with the center of the box 30 in the left-right direction. The opposing surface 32f corresponds to a surface of the front surface 32 that is in the range between the left end 36L and the right end 36R in the left-right direction.

[0029] When the opposing surface 32f is formed as described above, the dimension of the gap W in the front-to-rear direction in the space S between the battery unit 19 and the counterweight 20 becomes smaller from the central portion 36M to the left end portion 36L, and becomes smaller from the central portion 36M to the right end portion 36R. In relation to this, the dimension of the gap Wl at the left end portion 36L and the dimension of the gap Wr at the right end portion 36R are each smaller than the dimension of the gap Wm at the central portion 36M. The dimension of the gap Wl corresponds to the dimension in the front-to-rear direction between the left end portion 36L and the battery unit 19. The dimension of the gap Wr corresponds to the dimension in the front-to-rear direction between the right end portion 36R and the battery unit 19. The gap Wm corresponds to the dimension in the front-to-rear direction between the central portion 36M and the battery unit 19. As a result, if the size of the battery unit 19 becomes large, the rear end of the battery unit 19 will be positioned close to the counterweight 20, which will limit the space S and make it more likely that the box 30 will interfere with the counterweight 20, making it difficult to interpose the box 30 between the battery unit 19 and the counterweight 20.

[0030] On the other hand, with regard to the thickness TH of the box 30 in the front-to-rear direction, the thickness THl at the left end of the box 30 in the front-to-rear direction is made thinner than the thickness THm at the center in the left-to-right direction of the box 30. Furthermore, the thickness THr at the right end of the box 30 in the front-to-rear direction is made thinner than the thickness THm at the center in the left-to-right direction of the box 30.

[0031] [Junction box structure] 3, the box 30 is formed in a trapezoidal shape that is symmetrical when viewed vertically from above. Specifically, the box 30 has a middle section 30M located in the center in the left-right direction of the upper rotating body 12, a left section 30L located on the left side of the middle section 30M, and a right section 30R located on the right side of the middle section 30M.

[0032] The middle portion 30M is rectangular when viewed vertically from above. That is, the middle portion 30M has a constant thickness THm in the front-to-rear direction. The thickness THm of the middle portion 30M is the thickest in the box 30.

[0033] The left side portion 30L is inclined so that the surface facing the opposing surface 32f is positioned more forward as it moves leftward. As a result, the thickness THl of the left side portion 30L decreases as it moves leftward, based on the boundary point CRl with the middle portion 30M. Therefore, the thickness THl of the left side portion 30L is equal to or less than the thickness THm of the middle portion 30M at any point in the left-right direction. The thickness THl in the front-to-rear direction is thinnest at the left end of the left side portion 30L. The surface of the left side portion 30L facing the opposing surface 32f may be flat or curved, as long as the thickness THl is thin.

[0034] The right side portion 30R is inclined so that the surface facing the opposing surface 32f is positioned more forward toward the right. As a result, the thickness THr of the right side portion 30R decreases toward the right, based on the boundary point CRr with the intermediate portion 30M. Therefore, the thickness THr of the right side portion 30R is equal to or less than the thickness THm of the intermediate portion 30M at any point in the left-right direction. The thickness THr in the front-rear direction is thinnest at the right end of the right side portion 30R. The surface of the right side portion 30R facing the opposing surface 32f may be flat or curved, as long as the thickness TH is small.

[0035] As the size of the battery unit 19 increases, the gap W in the front-to-rear direction in the space S between the battery unit 19 and the counterweight 20 decreases. Furthermore, because the opposing surface 32f of the counterweight 20 is positioned further forward from the center portion 36M toward the left end 36L or the right end 36R, the gap W on both the left and right sides of the space S becomes even smaller. In contrast, by making the thickness THl of the left side 30L and the thickness THr of the right side 30R of the box 30 thinner than the thickness THm of the middle portion 30M, it is possible to interpose the box 30 between the battery unit 19 and the counterweight 20 while avoiding interference between the box 30 and the counterweight 20, even if the size of the battery unit 19 increases.

[0036] The box 30 has a removable rear wall 68 located at the rear end of the box 30. The box 30 includes a box body 67 fixed to a support frame 48 (described later) and the rear wall 68 that closes the opening of the box body 67. The box body 67 has a box shape with an open rear end.

[0037] FIG. 4 is a diagram showing the interior of the box 30, and is a rear view showing a state in which a rear wall 68 attached to the rear end of the box 30 has been removed. A bolt hole seat 72 is formed on the outer edge of the box body 67. A plurality of bolt holes 74 for fastening a plurality of bolts 70 (see FIGS. 5 to 7) are formed in the bolt hole seat 72. When removing the rear wall 68, the plurality of bolts 70 arranged along the outer edge of the box body 67 are removed. When attaching the rear wall 68, the plurality of bolts 70 are fastened with the outer edge of the rear wall 68 overlapping the bolt hole seat 72. The rear wall 68 has a curved shape that matches the trapezoidal shape of the box 30 when viewed vertically from above.

[0038] Furthermore, grooves 76 for filling with a sealing material may be formed in bolt hole seating surfaces 72. In this case, grooves 76 are formed along bolt hole seating surfaces 72. When rear wall 68 is attached, rear wall 68 is attached with grooves 76 filled with a sealing material such as liquid packing, thereby ensuring dustproofness and waterproofness of box 30.

[0039] As shown in FIG. 4 , the box 30 accommodates multiple electrical components, including a contactor 60, multiple fuses 62, and multiple bus bars 64. All of these electrical components are mounted on a switchboard 66. The contactor 60 is an electrical device that opens and closes contacts. Multiple fuses 62 are arranged adjacent to each other on the left side of the switchboard 66. Multiple bus bars 64 are made of conductors that conduct large amounts of current, and are arranged in the box 30. For example, the bus bars 64 include a first bus bar 64a and a second bus bar 64b. Maintenance and inspection of the box 30 can be easily performed by removing the rear wall 68.

[0040] Among the various electrical components housed within the box 30, the contactor 60 is the component that has the longest length from the switchboard 66, i.e., the longest dimension in the front-to-rear direction, compared to other electrical components (such as the fuse 62 and bus bar 64). Electrical components with the longest dimension in the front-to-rear direction, such as the contactor 60, are arranged in the middle section 30M of the box 30. By arranging components with a longer dimension in the front-to-rear direction compared to other electrical components, such as the contactor 60, in the middle section 30M, which has the largest thickness TH, the contactor 60 can be housed within the box 30 even if the thickness TH at both left and right ends of the box 30 is thin. Electrical components with a shorter dimension in the front-to-rear direction compared to the contactor 60, such as the fuse 62 and bus bar 64, may be arranged in the left section 30L or right section 30R, or may be arranged in the middle section 30M. The contactor 60 is an example of a component with the longest dimension in the front-to-rear direction in the present disclosure.

[0041] Box Fixed Structure Next, the fixing structure of the box 30 will be described. Fig. 5 is a rear view of the battery unit 19 and the box 30 as seen from the rear. Fig. 6 is a perspective view of the battery unit 19 and the box 30 as seen from the right rear. Fig. 7 is a perspective view of the battery unit 19 and the box 30 as seen from the left rear.

[0042] The battery unit 19 includes a battery body 40 having a rectangular parallelepiped shape and a support member 42 that supports the battery body 40. The support member 42 includes a lower plate 46 arranged below the battery body 40, a support frame 48 arranged to surround the battery body 40, and a battery fixing member 50 arranged further inward of the support frame 48 to fix the battery body 40. The lower plate 46 may be the rotating frame 16 of the upper rotating body 12.

[0043] The battery main body 40 has three battery packs 40a to 40c, which are stacked one on top of the other. The number of battery packs is not limited to three and may be changed as appropriate.

[0044] The support frame 48 includes a plurality of frame members arranged along each side of the rectangular parallelepiped shape of the battery main body 40. Specifically, the support frame 48 includes a pair of first frame members 48a located on the front side of the battery main body 40 and arranged along the up-down direction, a second frame member 48b having both left-right ends connected to the upper parts of the pair of first frame members 48a, a pair of third frame members 48c extending rearward from the upper ends of the pair of first frame members 48a, a fourth frame member 48d having both left-right ends connected to the rear ends of the pair of third frame members 48c, and a pair of fifth frame members 48e extending downward from the rear ends of the pair of third frame members 48c.

[0045] The three battery packs 40a to 40c are stacked and secured together by the battery fastening member 50. The battery fastening member 50 includes a first plate 50a interposed between the box 30 and the battery main body 40, a second plate (not shown) disposed on the opposite side of the battery main body 40 from the side on which the first plate 50a is disposed, and a connecting member 50b connecting the first plate 50a and the second plate.

[0046] The first plate 50a is formed in a rectangular shape and is disposed adjacent to the battery main body 40. A connecting member 50b is connected to the upper part of the first plate 50a. The connecting member 50b is disposed along the upper surface of the battery main body 40 in the front-to-rear direction. A second plate (not shown) is connected to the front end of the connecting member 50b. The second plate is formed in a rectangular shape and is disposed adjacent to the battery main body 40. The lower end of the second plate is connected to the lower plate 46. Therefore, the first plate 50a is connected to the lower plate 46 via the connecting member 50b and the second plate.

[0047] The box 30 is fixed to the first plate 50a. The right side of the box 30 is fixed to the first plate 50a via an L-shaped metal fitting 56. Specifically, one surface of the L-shaped metal fitting 56 is fixed to the first plate 50a with a plurality of bolts 84, and the other surface of the L-shaped metal fitting 56 is fixed to the right side of the box 30 with a plurality of bolts 86. In addition, a vertically bent portion 58 is formed at the left end of the first plate 50a, and the left side of the box 30 is directly fixed to the bent portion 58 with a plurality of bolts 88. As a result, the box 30 is supported by the first plate 50a, and the first plate 50a also functions as a mounting bracket for the box 30.

[0048] A standing plate 54 is disposed below the box 30. The standing plate 54 stands perpendicular to the lower plate 46. When viewed from the rear, the standing plate 54 is formed in a U-shape so as to avoid interference with the box 30. Furthermore, the upper ends of portions extending upward from both the left and right ends of the standing plate 54 are connected to a pair of fifth frame members 48e by bolts 80, respectively.

[0049] [Variations] In the above embodiment, the box 30 is formed in a trapezoidal shape when viewed vertically from above, but the present disclosure is not necessarily limited to a trapezoidal shape. For example, the rear part of the box 30 may be formed in an arc shape when viewed vertically from above, in accordance with the arc shape of the counterweight 20.

[0050] In the above embodiment, the opposing surface 32f of the counterweight 20 is formed so as to be positioned further forward from the center portion 36M toward the left and right end portions 36L, 36R, but it may be formed so as to be positioned further forward toward only one of the left and right ends. In addition, one of the thickness THl in the front-to-rear direction at the left end of the box 30 and the thickness THr in the front-to-rear direction at the right end of the box 30 may be thinner than the thickness THm of the center of the box 30.

[0051] In the above embodiment, the opposing surface 32f is formed so as to be positioned more forward from the center portion 36M toward the left and right end portions 36L, 36R throughout the entire range, but the present disclosure is not limited to this. For example, the opposing surface 32f may be positioned more forward from a position a predetermined distance to the left of the center portion 36M toward the left end portion 36L, or the opposing surface 32f may be positioned more forward from a position a predetermined distance to the right of the center portion 36M toward the right end portion 36R.

[0052] In the above embodiment, the box 30 is formed symmetrically, but it may be formed asymmetrically. For example, if the opposing surface 32f of the counterweight 20 is formed asymmetrically, the box 30 may also be formed asymmetrically in accordance with the shape of the opposing surface 32f.

[0053] In the above embodiment, the box 30 is a housing that houses multiple electrical components, but the present disclosure is not limited to this. For example, the housing may be a case for a charger, a case for a DC-DC converter, a case for an inverter, or the like.

[0054] In the above embodiment, the counterweight 20 is provided as a rear protective member at the rear end of the upper rotating body 12, but the rear protective member of the present disclosure is not limited to the counterweight 20. For example, a guard panel for protecting the rear end of the upper rotating body 12 may be provided as a rear protective member at the rear end of the upper rotating body 12.

[0055] In the above embodiment, the hydraulic excavator 1 is described as an example of a work machine, but the present disclosure is not limited to a hydraulic excavator. The work machine may be in another form, such as a crane. Furthermore, the undercarriage 10 is not limited to a crawler type, and may be a travel device having tires.

[0056] In the above embodiment, the box 30 is supported by the first plate 50a of the battery fixing member 50, but the present disclosure is not limited to this. For example, the box 30 may be supported by the support frame 48.

[0057] In the above embodiment, the contactor 60 is the component with the highest height in the front-to-rear direction among the multiple electrical components, but the present disclosure is not limited to this. That is, the component with the highest height in the front-to-rear direction can be changed as appropriate depending on the components housed in the box 30. [Explanation of symbols]

[0058] 12: Upper rotating body (car body) 19: Battery unit (battery) 20: Counterweight (rear protection member) 30: Junction box (enclosure) 30L: Left side 30R: Right side 30M: Middle part 32:Front 32f: Opposite surface 36L: Left end (end) 36R: Right end (end) 36M: Central part 42: Support member 60: Contactor (electrical component, longest component in the front-to-rear direction) 62: Fuse (electrical part) 64: Busbar (electrical component) 68: Back wall

Claims

1. A battery mounted on the vehicle body; a rear protection member disposed at a rear end of the vehicle body; a housing interposed between the battery and the rear protection member, the rear protection member has an opposing surface that is a front surface that faces the housing in the front-rear direction of the vehicle body, At least one of the left and right ends of the opposing surface is located forward of a center portion of the opposing surface in the left-right direction, A work machine wherein at least one of the front-to-rear thickness of the casing at the left end and the front-to-rear thickness of the casing at the right end is thinner than the thickness of the casing at the center in the left-to-right direction.

2. The work machine according to claim 1 , wherein the opposing surface is positioned further forward from the central portion toward the at least one end portion.

3. The work machine according to claim 1 , wherein the opposing surface is positioned further forward from the central portion toward the left end and further forward from the central portion toward the right end.

4. the housing is supported by the battery or a support member interposed between the battery and the housing, The work machine according to claim 1 , wherein the rear wall of the housing is removable.

5. the housing has a middle portion located at the center in the left-right direction of the vehicle body, a left portion located on the left side of the middle portion, and a right portion located on the right side of the middle portion, the thickness of the left side portion decreases toward the left in the left-right direction of the vehicle body, The work machine according to claim 1 , wherein the right side portion has a thickness that decreases toward the right side in the left-right direction of the vehicle body.

6. A plurality of electrical components are housed inside the housing, The work machine according to claim 5 , wherein the component having the longest dimension in the front-to-rear direction among the plurality of electrical components is disposed in the intermediate portion.

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