Work machine

Abstract

The present invention provides a work machine capable of enhancing the comfort of a driver's seat.　The present invention comprises a prime mover (5), a driver's seat (DS) spaced apart from the prime mover (5), and a partition wall (7) disposed between the prime mover (5) and the driver's seat (DS). The partition wall (7) includes a hollow partition wall body (70) and a foam member (71) filled in the partition wall body (70).

Description

Work machine

[0001] The present invention relates to a work machine including a prime mover and an operator's cab.

[0002] Conventionally, a work machine including a prime mover room in which a prime mover is housed, an operator's cab disposed in front of the prime mover room, and a partition wall made of a metal plate disposed between the prime mover room and the operator's cab is known (for example, see Patent Document 1).

[0003] Japanese Patent Publication "JP-A-2019-116174"

[0004] In the work machine of Patent Document 1, a partition wall is disposed between the prime mover room and the operator's cab. That is, a partition wall is disposed between the prime mover and the operator's seat, and the driving noise of the prime mover generated in the prime mover room is suppressed from being transmitted to the operator's seat side, so that the quietness of the operator's seat can be obtained. However, in recent years, further improvement in the quietness and temperature retention of the operator's cab of the work machine, that is, further improvement in the comfort of the operator's cab of the work machine has been demanded.

[0005] Therefore, the present invention provides a work machine capable of enhancing the comfort of the operator's cab.

[0006] A work machine according to an aspect of the present invention includes a prime mover, an operator's seat disposed at an interval from the prime mover, and a partition wall disposed between the prime mover and the operator's seat. The partition wall includes a hollow partition wall body and a foaming member filled in the partition wall body.

[0007] A work machine according to another aspect of the present invention includes a prime mover, an operator's seat disposed at an interval from the prime mover, a first partition wall made of metal disposed between the prime mover and the operator's seat, and a second partition wall made of resin disposed opposite to the first partition wall.

[0008] According to the present invention, the comfort of the operator's cab can be enhanced.

[0009] Figure 1 is an overall perspective view of the work machine according to the first embodiment of the present invention, viewed from the front left. Figure 2 is an overall perspective view of the work machine according to the first embodiment, viewed from the rear right. Figure 3 is a cross-sectional view taken along line III-III of Figure 1. Figure 4 is a schematic plan view of the turntable (swivel base) of the work machine according to the first embodiment. Figure 5 is a partial perspective view for illustrating the configuration of the turntable (swivel base) and its surroundings of the work machine according to the first embodiment. Figure 6 is a schematic perspective view of the structure of the work machine according to the first embodiment. Figure 7 is a schematic perspective view of the structure of the work machine according to the first embodiment, viewed from the front left, showing the structure attached to the turntable. Figure 8 is a schematic perspective view of the structure of the work machine according to the first embodiment, viewed from the rear left, showing the structure attached to the turntable. Figure 9 is a partially exploded perspective view of the work machine according to the first embodiment, showing the relationship between the partition wall and the structure. Figure 10 is a schematic perspective view of the partition wall of the work machine according to the first embodiment. Figure 11 is a cross-sectional view taken along line XI-XI of Figure 10. Figure 12 is a cross-sectional view taken along line XII-XII of Figure 10. Figure 13 is a perspective view including a partial cross-section of the work machine of the first embodiment, and is a perspective view to explain the relationship between the partition wall and the structure. Figure 14 is an overall perspective view of the work machine of the second embodiment of the present invention, viewed from the left front. Figure 15 is an overall perspective view of the work machine of the second embodiment, viewed from the right rear. Figure 16 is a cross-sectional view taken along line XVI-XVI of Figure 14. Figure 17 is a partial perspective view including the structure of the work machine of the second embodiment, and is a partial perspective view taken from the front. Figure 18 is a partial perspective view including the structure of the work machine of the second embodiment, and is a partial perspective view taken from the rear. Figure 19 is a partial perspective view including the structure of the work machine of the second embodiment, and is a partial perspective view taken from the front in a partially disassembled state. Figure 20 is a cross-sectional view of the vibration isolation device (vibration isolation mechanism) of the work machine of the second embodiment. Figure 21 is a perspective view of the first partition wall of the work machine of the second embodiment, viewed from the front. Figure 22 is a cross-sectional view of the first partition wall of the work machine of the second embodiment, assembled into the structure. Figure 23 is a perspective view of the second bulkhead (cover) of the work machine according to the second embodiment, viewed from the front. Figure 24 is a cross-sectional view taken along line XXIV-XXIV of Figure 23. Figure 25 is a cross-sectional view taken along line XXV-XXV of Figure 23.Figure 26 is a cross-sectional view of the fixing part (first fixing part (lower fixing part)) of the work machine according to the second embodiment. Figure 27 is a cross-sectional view of the fixing part (second fixing part (upper fixing part)) of the work machine according to the second embodiment. Figure 28 is an exploded perspective view of the area around the first partition wall and the second partition wall (cover) of the work machine according to the second embodiment. Figure 29 is a perspective view including a cross-section of the area around the first partition wall and the second partition wall (cover) of the work machine according to the second embodiment.

[0010] The following description will explain a work machine according to one embodiment of the present invention, with appropriate reference to the drawings. The work machine of this embodiment is mobile. Accordingly, in the following description, the direction in which the work machine moves straight (forward and backward) will be referred to as the forward / backward direction, and the direction perpendicular to both the up / down direction and the forward / backward direction will be referred to as the lateral direction.

[0011] As shown in Figures 1 to 3, the work machine 1 is equipped with work devices 2 (2a, 2b) for performing predetermined tasks and performs functions according to the purpose of the work. In this embodiment, a backhoe, which is a type of construction machine, will be described as an example of the work machine 1.

[0012] The work machine 1 is equipped with a traveling device 3. That is, as shown in Figures 1 and 2, the work machine 1 is equipped with a work device 2 (2a, 2b) that performs a predetermined work and a traveling device 3 that is capable of moving. Accordingly, the work machine 1 is equipped with a body 4 that is supported by the traveling device 3 and supports the work devices 2 (2a, 2b).

[0013] As described above, the work machine 1 of this embodiment is a backhoe, and the work device 2 includes a shovel device 2a and a bulldozer device 2b.

[0014] The shovel device 2a and the dozer device 2b are hydraulic. Specifically, the work machine 1 is equipped with hydraulic cylinders HS1, HS2, and HS3 for operating the shovel device 2a, and hydraulic cylinder HS4 for operating the dozer device 2b.

[0015] The travel device 3 is driven by the prime mover 5, either directly or indirectly. The work machine 1 of this embodiment includes a pair of travel devices 3, 3 arranged on both sides of the machine body 4 in the lateral direction. Each of the pair of travel devices 3, 3 employs a crawler-type travel device, but a tire-type travel device may also be used. The travel device 3 includes a travel motor HM1 as a drive source (see Figure 3). In this embodiment, the travel motor HM1 is a hydraulic motor.

[0016] In the work machine 1 of this embodiment, the work device 2 (shovel device 2a and dozer device 2b) and the travel device 3 are hydraulically driven as described above. Accordingly, as shown in Figure 3, the work machine 1 includes a hydraulic system HS that includes a hydraulic pump P for discharging hydraulic fluid, and the hydraulic system HS supplies hydraulic fluid to the hydraulic cylinders HS1, HS2, HS3, HS4 of the work device 2 (shovel device 2a, dozer device 2b) and the hydraulic motor HM1 (travel motor HM1) of the travel device 3.

[0017] In this embodiment, the work machine 1 also rotates the turntable 41 by hydraulic drive. Specifically, the work machine 1 includes hydraulic motors HM1 and HM2 for driving the traveling device 3 and the turntable 41, and hydraulic cylinders HS1, HS2, HS3, and HS4 for operating the work devices 2 (shovel device 2a and dozer device 2b).

[0018] Accordingly, the work machine 1 is equipped with a hydraulic system HS including a hydraulic pump P that supplies hydraulic fluid to hydraulic motors HM1, HM2 and hydraulic cylinders HS1, HS2, HS3, and HS4. The prime mover 5 drives the hydraulic pump P to circulate the hydraulic fluid in the hydraulic system HS and supplies the hydraulic fluid to the hydraulic motors HM1, HM2 and hydraulic cylinders HS1, HS2, HS3, and HS4.

[0019] The prime mover 5 is supported by the turntable 41 and is located behind the driver's cab DR (driver's seat DS). In this embodiment, a diesel engine is used as the prime mover 5, but it is not limited to this, and other internal combustion engines such as a gasoline engine, LPG engine, or hydrogen engine may also be used. Furthermore, the prime mover 5 is not limited to an internal combustion engine, but may also be an electric motor.

[0020] In this embodiment, the prime mover 5 drives the hydraulic pump P of the hydraulic system HS, and the hydraulic fluid discharged from the hydraulic pump P drives each part of the work machine 1 (travel motor HM1, slewing motor HM2, swing cylinder, boom cylinder HS1, arm cylinder HS2, bucket cylinder HS3, dozer lifting cylinder HS4, etc.). In other words, the prime mover 5 indirectly drives the work device 2 and the travel device 3.

[0021] The work machine 1 (body 4) is equipped with a turntable (also called a turntable base) 41 supported by a traveling device 3. More specifically, the work machine 1 (body 4) includes a traveling base 40 connected to a pair of left and right traveling devices 3, 3, and a turntable 41 positioned above the traveling base 40, which is capable of rotating around an axis CL extending in the vertical direction.

[0022] The work machine 1 (body 4) comprises a prime mover 5, a driver's seat DS positioned at a distance from the prime mover 5, and a bulkhead 7 positioned between the prime mover 5 and the driver's seat DS. The work machine 1 (body 4) also comprises a structure 8 as a support 8 for the bulkhead 7. The work machine 1 (body 4) also comprises an elastic sealing member 85 interposed between the bulkhead 7 and the structure 8.

[0023] The work machine 1 (machine body 4) of this embodiment is equipped with a driver's seat protection device 42 that protects the driver's seat DS. That is, the machine body 4 is positioned on a turntable 41 and includes a driver's seat protection device 42 that defines the driver's cab DR (riding space). The work machine 1 is equipped with an exterior body 46 that protects equipment such as the prime mover 5.

[0024] A pair of traveling devices 3, 3 are attached to the traveling base 40. The traveling base 40 is positioned between the pair of traveling devices 3, 3. A dozer device 2b, which is a work device 2b, is also connected to the traveling base 40. The dozer device 2b is located between the pair of traveling devices 3, 3 and extends forward of the traveling base 40.

[0025] The driver's cab DS, the prime mover 5, and the structural elements 8 are supported by the turntable 41. In other words, the turntable 41 supports the driver's cab DS, the prime mover 5, the driver's cab protection device 42, etc. The turntable 41 also supports the shovel device 2a, which is the working device 2a.

[0026] Specifically, the turntable 41 is supported by the travel base 40 via a slewing bearing 43. That is, the turntable 41 is indirectly supported by the travel devices 3,3 via the slewing bearing 43 and the travel base 40. As a result, the turntable 41 can rotate around an axis CL that extends in the vertical direction. The turntable 41 is formed in a plate shape and has thickness in the vertical direction. The prime mover 5, driver's seat DS, structure 8, driver's seat protection device 42, and bonnet 46 are arranged on the upper surface of the turntable 41. A counterweight 48 is attached to the rear end of the turntable 41.

[0027] More specifically, the turntable 41 includes a base plate 410 that supports the driver's cab protection device 42 and the prime mover 5, and a device support 411 that is attached to the base plate 410 and supports the work device (shovel device) 2a.

[0028] The base plate 410 is a metal plate and is connected to the travel base 40 via a swivel bearing 43. As shown in Figure 4, of the overall area A of the base plate 410 according to this embodiment (overall area A as viewed from above), the area on the front side in the front-rear direction is set as the area where the driver's seat DS and driver's seat protection device 42 are arranged (hereinafter referred to as the first arrangement area A1), and the area on the rear side in the front-rear direction is set as the area where the prime mover 5 is arranged (hereinafter referred to as the second arrangement area A2). In this embodiment, in addition to the prime mover 5, the second arrangement area A2 also includes a fuel tank T1 for storing fuel for the internal combustion engine (prime mover 5), a hydraulic oil tank T2 for storing hydraulic oil for the hydraulic system HS, and the like.

[0029] Returning to Figure 3, the first placement area A1 of the base plate 410 is where the step 49, which constitutes the floor slab, is placed. The step 49 is a metal plate and is positioned above the upper surface of the base plate 410. Accordingly, as shown in Figure 5, a plurality of support members 413 and 414 are erected on the base plate 410 to support the step 49.

[0030] The support members 413 and 414 are erected at multiple locations on the base plate 410, but their shapes differ depending on their placement. As shown in Figure 3, step 49 is fixed to the upper ends of the support members 413 and 414 fixed to the base plate 410, and faces the base plate 410 with a gap above it. In other words, step 49 is positioned with a gap in the vertical direction relative to the base plate 410. As a result, step 49 forms a structure that is integrated with the base plate 410 via the support members 413 and 414.

[0031] The device support 411 is connected to the front end of the base plate 410. Consequently, the shovel device 2a connected to the device support 411 extends outward (forward) relative to the turntable 41 (base plate 410). In this embodiment of the work machine 1 (backhoe), the orientation (position) of the device support 411 (work device 2a) changes as the turntable 41 rotates, but the standard state (posture) is when the device support 411 (shovel device 2a) is positioned on the front side in the front-rear direction.

[0032] The driver's seat DS is positioned on the step 49. In this embodiment, the driver's seat protection device 42 is a cabin 42 that covers the entire driver's seat DS. That is, the driver's seat protection device 42 is a cabin 42 that covers the driver's seat DS and defines the driver's cabin DR where the worker stays. The driver's seat protection device 42 may also be a canopy including a roof that covers the top of the driver's seat DS and pillars that support the roof.

[0033] The driver's cab (DR) houses the operating unit (OS) used by the operator. Specifically, the operating unit (OS) in the driver's cab (DR) contains various devices such as the work operation unit 44 (operating lever) for operating the work devices 2a and 2b, and the travel operation unit 45 (operating lever) for operating the travel device 3.

[0034] The driver's cab DR is a space enclosed by the step 49 on which the driver's seat DS and the like are placed, and the driver's seat protection device 42. That is, the cabin 42 covers the entire first placement area A1 of the base plate 410 and defines the driver's cab DR, including the driver's seat DS. In this embodiment, the driver's cab DR (worker's accommodation space) is defined by the step 49 which constitutes the floor (floor plate) on which the driver's seat DS (seat) is placed, the bulkhead 7, and the cabin 42 which covers the driver's seat DS on the step 49.

[0035] In this embodiment, the lower end of the rear side of the cabin 42 is located above the lower end of the front side of the cabin 42. The front end of the cabin 42 is supported by the front end of the step 49. In contrast, the rear end of the cabin 42 is supported by the structure 8 at a higher position than the front end. That is, the cabin 42 is formed to protrude behind the rear end of the step 49 (hereinafter, the protruding portion is referred to as the rear region). The lower end of the rear region of the cabin 42 is formed in accordance with the shape of the exterior body (bonnet) 46.

[0036] Specifically, the front end (forward end) FE of the cabin 42 is positioned along the front end (front end) of the step 49. In contrast, the rear end (rear end) BE of the cabin 42 is positioned beyond the boundary between the first placement area A1 and the second placement area A2, towards the second placement area A2. In this embodiment, the rear end BE of the cabin 42 is supported by a support structure 8. Consequently, the front end FE and the rear end BE of the cabin 42 are located at different vertical positions. That is, the rear end BE of the cabin 42 is positioned higher than the front end FE.

[0037] More specifically, the cabin 42 has a peripheral wall portion 420 surrounding the driver's seat DS, and a roof 421 that closes the upper end opening of the peripheral wall portion 420. The peripheral wall portion 420 includes a front portion 420a and a rear portion 420b arranged at intervals in the front-rear direction, and a pair of side portions 420c, 420c arranged at intervals in the lateral direction. The lower end of the rear portion 420b is higher than the lower end of the front portion 420a and is positioned on a leg connecting portion 81 of the structure (structure) 8, which will be described later.

[0038] Each of the pair of side sections 420c, 420c includes a front lower end along the lateral side edge of the step 49 and a lower end extending rearward from the step 49. The rear lower ends of each of the pair of side sections 420c, 420c are formed to rise toward the lower end of the rear section 420b. As a result, both sides of the cabin 42 (the pair of side sections 420c, 420c) form a region into which the side section 461 of the exterior body (bonnet) 46, described later, fits (see Figures 1 and 2).

[0039] In this embodiment, step 49 is positioned above the turntable 41, spaced apart from it. Between step 49 and the turntable 41, a first machine room M1 is formed to house equipment included in the hydraulic system HS (for example, the hydraulic motor HM2 that rotates the turntable 41 and the control valve unit VU). That is, as step 49 is positioned above the base plate 410, a space is formed between step 49 and the base plate 410 in the first arrangement area A1, and various equipment of the hydraulic system HS (for example, the control valve unit VU) is arranged in this space (first machine room M1).

[0040] The work machine 1 is equipped with a bonnet 46 as an exterior body 46 that covers the equipment placed on the base plate 410. The bonnet 46 is positioned behind the rear portion 420b of the cabin 42. In other words, the second placement area A2 is covered by the exterior body (bonnet) 46.

[0041] The longitudinal length of step 49 is set to be shorter than the longitudinal length of the turntable 41. In contrast, the lateral lengths of step 49 and the turntable 41 are set to be the same or approximately the same. Step 49 is positioned such that its front end in the longitudinal direction corresponds to (matches or approximately matches) the front end in the longitudinal direction of the turntable 41 in the vertical direction. Consequently, step 49 faces a region of the turntable 41 that is offset to the front in the longitudinal direction.

[0042] Therefore, the rear end side (second arrangement region A2) of the turntable 41 protrudes rearward of the rear end in the front-rear direction of the step 49 when viewed from the vertical direction (upward). Along with this, a second machine room M2 for housing devices such as the prime mover 5, radiator, oil cooler, etc. is formed in the rear region protruding from the rear end of the step 49 of the turntable 41. Thereby, the first machine room M1 and the second machine room M2 are arranged (formed) side by side in the front-rear direction on the turntable 41.

[0043] In the present embodiment, the bonnet (outer body) 46 covers devices such as the prime mover 5, heat exchangers (radiator, oil cooler), fuel tank T1, hydraulic oil tank T2, etc. arranged in the second arrangement region A2.

[0044] In the present embodiment, as shown in FIG. 5, a partition plate 414a for partitioning the first machine room M1 and the second machine room M2 is arranged between the first machine room M1 and the second machine room M2. In the present embodiment, the partition plate 414a stands on the turntable 41 and is arranged along the rear end of the step 49. A support block 414c for supporting the structure 8 is attached to the partition plate 414a.

[0045] Specifically, the support block 414c is attached to the surface of the partition plate 414a facing the second machine room M2 side. The support block 414c may be formed to extend horizontally so as to support the structure 8, but in the present embodiment, two support blocks 414c are provided at intervals corresponding to the arrangement of a pair of first support legs 80a, 80a (also referred to as front legs) of the structure 8 described later.

[0046] As shown in FIGS. 6 to 8, the structure 8 includes a pair of first support legs 80a, 80a which are a pair of support legs 80a, 80a arranged at intervals in the horizontal direction, and a leg connecting portion 81 for connecting the pair of first support legs 80a, 80a, the leg connecting portion 81 extending in the horizontal direction. The structure 8 of the present embodiment includes, in addition to the pair of first support legs 80a, 80a and the leg connecting portion 81, second support legs (also referred to as rear legs) 80b, 80b which are connected to the leg connecting portion 81 and extend downward from the leg connecting portion 81 toward the rear side.

[0047] Each of the pair of first support legs 80a, 80a is supported by a support block 414c (see FIGS. 7 and 8). The pair of first support legs 80a, 80a includes a first portion 800a extending upward in the vertical direction from the support block 414c, and a second portion 800b inclined rearward from the upper end of the first portion 800a. At the upper end of the second portion 800b, a third portion 800c extends upward, and a leg connecting portion 81 is connected to the third portion 800c. As a result, the leg connecting portion 81 is disposed rearward of the first portion 800a and above the step 49.

[0048] The leg connecting portion 81 has a longitudinal direction in the lateral direction and is formed in a strip plate shape. The leg connecting portion 81 is formed in accordance with the shape of the partition wall 7 (the second wall 702b of the rearward extending portion 702 described later) in a plan view. As described above, the leg connecting portion 81 supports the lower end (the rear end portion of the cabin 42) of the rear surface portion 420b of the cabin 42. Accordingly, vibration isolators 9, 9 capable of supporting the cabin 42 are attached to the leg connecting portion 81 (see FIG. 3). In the present embodiment, the two vibration isolators 9, 9 are attached at intervals in the lateral direction.

[0049] The second support legs 80b, 80b are directly or indirectly supported by the rear end portion of the swivel base 41. The structure 8 of the present embodiment includes a pair of second support legs 80b, 80b. The pair of second support legs 80b, 80b are arranged at intervals in the lateral direction.

[0050] As shown in FIG. 8, the lower end of each of the pair of second support legs 80b, 80b is supported by the rear end portion 52 of the swivel base 41. In the present embodiment, the rear end portion 52 of the swivel base 41 is bent so as to stand up. The pair of second support legs 80b, 80b are directly or indirectly connected and supported to the rear end portion 47 (rear end support member 47) of the swivel base 41 formed in a bracket shape.

[0051] In the working machine 1 of the present embodiment, the partition wall 7 disposed between the prime mover 5 and the driver's seat DS is a single one. That is, the partition wall disposed between the prime mover 5 and the driver's seat DS may include a plurality (two or more) of partition walls, but in the present embodiment, it is constituted by a single partition wall 7.

[0052] The bulkhead 7 is made of resin. In this embodiment, as shown in Figures 3 and 9, the bulkhead 7 is positioned to cover the structure 8 from the driver's cab DR side (driver's seat DS side). That is, the bulkhead 7 is positioned to overlap the structure 8 from the driver's seat DS side. In this state, the bulkhead 7 separates (blocks) the driver's cab DR and the second machine room M2 (see Figure 3).

[0053] More specifically, as shown in Figure 3, the bulkhead 7 is assumed to be positioned on the driver's seat DS side of the structure 8. As shown in Figures 9 to 12, the bulkhead 7 includes a central bulkhead section 700 located behind the driver's seat DS, a pair of side bulkhead sections 701, 701 extending forward from both lateral ends of the central bulkhead section 700, and a rear extension section 702 extending rearward from the upper end of the central bulkhead section 700. The central bulkhead section 700 and the rear extension section 702 are superimposed on the structure 8, as shown in Figures 3 and 9. As a result, the bulkhead 7 covers the structure 8 from the driver's cab DR side (driver's seat DS side).

[0054] As shown in Figures 11 and 12, the partition wall 7 of this embodiment includes a hollow partition wall body 70 and a foamed material 71 filled inside the partition wall body 70. The partition wall body 70 includes a central partition wall portion 700, a pair of side partition wall portions 701, 701, and a rear extension portion 702. That is, the central partition wall portion 700, the pair of side partition wall portions 701, 701, and the rear extension portion 702 are integrally formed to create the partition wall body 70.

[0055] A hollow section HO is formed throughout or almost entirely of the partition wall body 70. Specifically, the partition wall body 70 includes opposing wall sections 700a, 700b, 701a, 701b, 702a, and 702b that are spaced apart and facing each other throughout or almost entirely of the partition wall body 700a, 700b, 701a, 701b, 702a, and 702b. As a result, a hollow section HO is formed between the opposing wall sections 700a, 700b, 701a, 701b, 702a, and 702b. The partition wall body 70 is a resin molded body. The partition wall 7 (partition wall body 70) is molded into a predetermined shape by blow molding. However, the material of the partition wall body 70 is not limited to resin; for example, it may be made of metal.

[0056] The partition wall body 70 of this embodiment includes opposing wall sections 700a, 700b, 701a, 701b, 702a, and second walls 700b, 701b, 702b, which are opposed to each other. That is, each of the central partition wall section 700, the pair of side partition wall sections 701, 701, and the rear extension section 702 has first walls 700a, 701a, 702a and second walls 700b, 701b, 702b.

[0057] More specifically, the partition wall body 70 includes first walls 700a, 701a, and 702a that constitute the side opposite to the prime mover 5 side, and second walls 700b, 701b, and 702b that are positioned closer to the prime mover 5 than the first walls 700a, 701a, and 702a.

[0058] The second walls 700b, 701b, and 702b are positioned at intervals from the first walls 700a, 701a, and 702a. As a result, a space HO is formed between the first walls 700a, 701a, and 702a and the second walls 700b, 701b, and 702b in each of the central partition wall section 700, the pair of side partition wall sections 701, 701, and the rear extension section 702.

[0059] The partition wall body 70 includes (has) outer peripheral wall portions 700c, 701c, and 702c that connect the outer edges of the first walls 700a, 701a, and 702a to the outer edges of the second walls 700b, 701b, and 702b.

[0060] The outer periphery walls 700c, 701c, and 702c maintain the distance between the first walls 700a, 701a, and 702a and the second walls 700b, 701b, and 702b. This creates a hollow space HO between the first walls 700a, 701a, and 702a and the second walls 700b, 701b, and 702b.

[0061] The first walls 700a, 701a, and 702a of the central partition wall 700, the pair of side partition walls 701, 701, and the rear extension 702 are formed continuously with respect to each other. Furthermore, the second walls 700b, 701b, and 702b of the central partition wall 700, the pair of side partition walls 701, 701, and the rear extension 702 are formed continuously with respect to each other. As a result, the hollow portion HO of the central partition wall 700, the pair of side partition walls 701, 701, and the rear extension 702 is formed as a continuous space.

[0062] In each of the central partition wall section 700, the pair of side partition wall sections 701, 701, and the rear extension section 702, the first walls 700a, 701a, 702a and the second walls 700b, 701b, 702b are arranged facing each other. The first walls 700a, 701a, 702a and the second walls 700b, 701b, 702b are formed in shapes (planar shapes or concave shapes) according to their respective arrangements. The outer peripheral wall sections 700c, 701c, 702c connect the outer edges of the first walls 700a, 701a, 702a and the outer edges of the second walls 700b, 701b, 702b. The central partition wall 700, the pair of side partition wall sections 701, 701, and the outer peripheral wall sections 700c, 701c, 702c of the rear extension 702 are formed in accordance with the shape of the outer edges of the first walls 700a, 701a, 702a and the second walls 700b, 701b, 702b.

[0063] The central bulkhead section 700 and the first walls 700a, 701a of the pair of side bulkhead sections 701, 701 are positioned on the driver's seat DS side (driver's cab DR side). Therefore, the central bulkhead section 700 and the first walls 700a, 701a of the pair of side bulkhead sections 701, 701 are shaped to match the arrangement of the driver's seat DS, the operating unit OS (see Figure 3), and various devices (equipment) located within the driver's cab DR. Furthermore, as shown in Figure 13, the central bulkhead section 700 is superimposed on the structure 8, so at least the region of the second wall 700b of the central bulkhead section 700 that faces the structure 8 (the pair of first support legs 80a, 80a) is formed to follow the structure 8 (the pair of first support legs 80a, 80a).

[0064] As shown in Figures 9 and 10, the bulkhead body 70 has inspection openings 72a and 72b that penetrate from the driver's seat DS side (driver's cab DR side) to the engine 5 side (engine 5 chamber side). Accordingly, as shown in Figure 9, the bulkhead 7 includes lid members 73a and 73b that close the inspection openings 72a and 72b.

[0065] In this embodiment, the inspection openings 72a and 72b are provided in the central partition wall 700. More specifically, the central partition wall 700 of the partition wall 7 (partition wall body 70) in this embodiment is provided with two inspection openings 72a and 72b. These two inspection openings 72a and 72b differ in size and shape. Accordingly, the two cover members 73a and 73b also differ in size and shape according to the corresponding inspection openings 72a and 72b. However, the manner in which the cover members 73a and 73b close the inspection openings 72a and 72b (the structure of mounting the cover members 73a and 73b) is the same.

[0066] Specifically, as described above, the partition wall body 70 is composed of a pair of opposing wall sections 700a, 700b, 701a, 701b, 702a, 702b (first wall 700a, 701a, 702a and second wall 700b, 701b, 702b) that are spaced apart and facing each other. In other words, the partition wall body 70 is a double wall. For this reason, as shown in Figure 12, each of the pair of opposing wall sections 700a, 700b (first wall 700a and second wall 700b) of the central partition wall section 700 is provided with an opening for forming inspection hatches 72a, 72b.

[0067] The central partition wall 700 is provided with an inner circumference connecting portion 700d that connects the inner circumferences of the openings of the pair of opposing wall sections 700a and 700b (the first wall 700a and the second wall 700b). This closes the periphery of the openings of the pair of opposing wall sections 700a and 700b (the first wall 700a and the second wall 700b). In this embodiment, for convenience, the inner circumference connecting portion 700d is described as a configuration independent of the first wall 700a and the second wall 700b, but since the partition wall body 70 is formed by blow molding, these are a seamless and continuous configuration.

[0068] In this embodiment, the periphery of the opening in the first wall 700a on the driver's cab DR side is offset towards the second wall 700b side, and recesses 704 are formed that can be fitted with lid members 73a and 73b that close the openings (inspection ports 72a and 72b).

[0069] As will be described in more detail later, the lid members 73a and 73b are screw-fixed to the bulkhead body 70. The bulkhead body 70 is provided with screw holes into which bolts are screwed. The screw holes in the bulkhead body 70, which are provided in various places for screw fixing, are provided by molding female screw members (nuts: not numbered) onto the bulkhead body 70 (first wall 700a), or by fitting (driving in) female screw members (nuts) into recesses 704 provided in the first wall 700a.

[0070] Each of the pair of side bulkheads 701, 701 is formed in accordance with the shape of the lower rear end of the cabin 42 (see Figures 1 and 2). That is, the outer edges of the pair of side bulkheads 701, 701 that face the lower end of the cabin 42 are formed to follow the lower rear end of the cabin 42. In this embodiment, as shown in Figure 10, a bulge 705 is formed in a predetermined range on the outer edge side of the second wall 701b of each of the pair of side bulkheads 701, 701, and in a predetermined range along the outer edge, bulging laterally outward. The bulge 705 has an inner edge that faces the opposite side of the outer edge. The inner edge of the bulge 705 is formed corresponding to the outer edge of the bonnet 46 (side portion 461).

[0071] As a result, in the bulkhead 7 (bulkhead body 70) of this embodiment, as shown in Figures 1 and 2, the bulging portions 705 of the pair of side bulkhead portions 701, 701 are positioned between the cabin 42 and the bonnet 46. As will be described in detail later, the rear extension portion 702 is also positioned between the cabin 42 and the bonnet 46.

[0072] As shown in Figures 3 and 13, the rear extension 702 is positioned on the leg connecting portion 81, so the second wall 702b of the rear extension 702 is formed in accordance with the shape of the leg connecting portion 81, as shown in Figures 11 and 13. That is, since the leg connecting portion 81 is formed in the shape of a strip, at least the portion of the second wall 702b of the rear extension 702 that faces the leg connecting portion 81 is formed in the shape of a flat plate (planar shape).

[0073] Furthermore, since the lower end of the rear surface portion 420b of the cabin 42 overlaps with the rear extension portion 702, at least the portion of the first wall 702a of the rear extension portion 702 that overlaps with the rear surface portion 420b (lower end) of the cabin 42 is also formed in a flat (planar) shape. In this embodiment, at least the portion of the first wall 702a of the rear extension portion 702 that overlaps with the lower end of the cabin 42 is formed to be raised relative to its surroundings.

[0074] As described above, the vibration isolation devices 9,9 are attached to the leg connecting portion 81 in a state where they protrude upward from the upper surface. Accordingly, the rear extension portion 702 is provided with relief holes 706, 706 that run vertically through to accommodate (avoid) the vibration isolation devices 9,9. As described above, in this embodiment, the two vibration isolation devices 9,9 are arranged with a gap between them in the lateral direction, so the two relief holes 706, 706 are arranged with a gap between them in the lateral direction in the rear extension portion 702.

[0075] In this embodiment, the rear extension portion 702 is formed to extend rearward from the rear surface of the cabin 42, with the lower end of the rear surface portion 420b of the cabin 42 overlapping. A device storage box TB for housing devices such as a grease injector is attached to the portion of the rear extension portion 702 that extends from the rear surface of the cabin 42 (see Figure 13). The rear edge of the rear extension portion 702 is formed to follow the upper edge of the bonnet 46.

[0076] In this embodiment, the outer edge of the bulkhead 7 is positioned between the cabin 42 and the bonnet 46. Specifically, as shown in Figure 10, the bulkhead 7 (bulkhead body 70) is formed such that the bulging portions 705 of the pair of side bulkhead portions 701, 701 and the outer peripheral wall portion 702c of the rear extension portion 702, which constitutes the outer edge of the rear end of the rear extension portion 702, are continuous. That is, the bulging portions 705 are formed to extend with respect to the outer edge of the rear extension portion 702. As a result, the bulging portions 705 of the pair of side bulkhead portions 701, 701 and the outer edge 702c of the rear extension portion 702 are continuously connected to constitute the outer edge of the bulkhead 7. In this embodiment, the outer peripheral wall portion 701c of the pair of side bulkhead portions 701, 701 is formed continuously with the first wall 702a of the rear extension portion 702.

[0077] In this embodiment, the bulging portions 705 of the pair of side bulkhead portions 701, 701 are located between the lower rear end of the cabin 42 and the side portion 461 of the bonnet 46, which will be described later. In addition, the rear extension portion 702 is located between the rear surface portion 420b of the cabin 42 and the back portion 460 of the bonnet 46, which will be described later.

[0078] As shown in Figures 1 and 2, the bulging portions 705 of the pair of side bulkheads 701, 701 are sandwiched between the lower rear end of the cabin 42 and the side portion 461 of the bonnet 46, and are exposed outward in the lateral direction. In contrast, the rear extension 702 is located between the rear surface portion 420b of the cabin 42 and the back portion 460 of the bonnet 46, and the rear end portion 702c of the rear extension 702 is exposed to the rear in both the lateral and longitudinal directions. As described above, since the equipment housing box TB is placed on the upper surface of the portion of the rear extension 702 that protrudes from the cabin 42, most of the rear extension 702 is concealed by the equipment housing box TB, and only the rear end portion 702c of the rear extension 702 is exposed to the outside. The rear end portion 702c of the rear extension 702 and the bulging portion 705 of the side wall form a continuous line, improving the design.

[0079] As described above, the rear extension 702 is formed by a pair of opposing wall portions 702a and 702b (first wall 702a and second wall 702b) that are spaced apart. Therefore, as shown in Figure 11, the relief holes 706, 706 are formed by providing concentric and identically diameter through holes in each of the pair of opposing wall portions 702a and 702b (first wall 702a and second wall 702b).

[0080] If through holes are provided in each of the pair of opposing wall sections 702a and 702b (first wall 702a and second wall 702b), the internal space will be opened up. To prevent this, a cylindrical connecting section 702d is provided that connects the inner circumferences of the through holes in each of the pair of opposing wall sections 702a and 702b (first wall 702a and second wall 702b). As a result, relief holes 706, 706 are formed in the partition wall 7 (rear extension 702) with the interior closed. As shown in Figure 13, by positioning the vibration isolation devices 9, 9 in the relief holes 706, 706, the partition wall 7 presses against a sealing member (not shown) positioned on the leg connecting section 81 without interfering with the vibration isolation devices 9, 9.

[0081] In this embodiment, the bulkhead 7 is fixed to the step 49 and the leg connecting portion 81 of the structure 8. Specifically, the lower end of the bulkhead body 70 is provided with a first fixing portion (lower fixing portion) 707a that protrudes forward or laterally (towards the driver's cab DR side), and the first fixing portion (lower fixing portion) 707a is positioned on the step 49. In this embodiment, as shown in Figure 10, the first fixing portion (lower fixing portion) 707a is provided at the lower end of the central bulkhead portion 700 and the pair of side bulkhead portions 701, 701. Each first fixing portion (lower fixing portion) 707a is formed so that a male screw member protruding upward from the step 49 can be inserted through it. As a result, the bulkhead 7 (bulkhead body 70) is firmly fixed on the step 49 by inserting the male screw member through the first fixing portion (lower fixing portion) 707a and then screwing a nut onto the male screw member (see Figure 13).

[0082] In this state, as shown in Figure 13, the rear extension 702 rests on the leg connecting portion 81. Accordingly, the rear extension 702 is screw-fixed to the leg connecting portion 81.

[0083] The foamed material 71 is a porous material and has closed or open cells. It is filled inside the partition wall body 70 (hollow section HO). That is, the foamed material 71 fills the inside (hollow section HO) of the partition wall body 70 (central partition wall section 700, a pair of side sections 461, 461, and rear extension section 702).

[0084] In this embodiment, the foamed member 71 is made of foamed polypropylene. The foamed member 71 is made by placing the material to be foamed into the molded partition body 70 and foaming it within the partition body 70. In this embodiment, beads (polypropylene beads (PP beads)) are placed inside the partition body 70 and then heated to cause the beads to foam. Due to the foaming of the beads, the beads expand in the hollow portion HO and adhere closely to the inner surface of the partition body 70 (the inner surface defining the hollow portion HO). As a result, the foamed member 71 (beads) fills the hollow portion HO of the partition body 70 without any gaps or with almost no gaps.

[0085] Here, the foamed material 71 may be expanded polystyrene, expanded polyethylene, expanded urethane foam, or the like, in addition to expanded polypropylene.

[0086] Returning to Figure 9, the lid members 73a and 73b are formed in a plate shape. The lid members 73a and 73b are made of a material with a large mass to enhance sound insulation. In this embodiment, the lid members 73a and 73b are made of metal plates. The lid members 73a and 73b overlap the periphery of the inspection openings 72a and 72b on the driver's seat DS side and close the inspection openings 72a and 72b. Note that the lid members 73a and 73b are not limited to metal plates; for example, similar to the partition wall 7, they may be made of a hollow lid body made of resin or metal filled with a foamed material.

[0087] The lid members 73a and 73b are set to be larger than the inspection openings 72a and 72b. A recess 704 is formed around the openings (inspection openings 72a and 72b) of the first walls 700a, 701a, and 702a of the partition wall member 7, recessed towards the second wall side. Accordingly, the lid members 73a and 73b are formed so that their outer peripheral ends overlap with the area around the inspection openings 72a and 72b when fitted into the recess 704.

[0088] The lid members 73a and 73b are provided with through holes (not numbered) for inserting bolts that are screwed into the screw holes of the partition wall body 70. The through holes in the lid members 73a and 73b are positioned to correspond to the screw holes (not numbered) of the partition wall body 70.

[0089] In this embodiment, the partition wall body 70 has two inspection openings 72a and 72b of different sizes, as described above. Accordingly, the partition wall 7 is equipped with lid members 73a and 73b to close each inspection opening 72a and 72b, but the two inspection openings 72a and 72b and the lid members 73a and 73b have the same basic structure except for differences in size and shape.

[0090] Furthermore, the lower end of the lid member 73a that closes the large inspection opening 72a is fixed by a fixing bracket 77 which is fixed to the lower end of the bulkhead body 70 (central bulkhead section 700). In other words, the lower end of the lid member 73a that closes the large inspection opening 72a is fixed in place, sandwiched between the fixing bracket 77 and the bulkhead body 70.

[0091] The sealing member 85 has elasticity (cushioning properties). As shown in Figure 13, the sealing member 85 is interposed between the second wall 700b of the partition wall 7 and the first support leg 80a. In this embodiment, the sealing member 85 is also interposed between the central partition wall portion 700 and the first support leg 80a. Although not shown, in this embodiment, the sealing member 85 is also interposed between the central partition wall portion 700 and the leg connecting portion 81.

[0092] As shown in Figures 1 to 3, the bonnet 46 covers the equipment located in the rear area extending backward from the rear end of the step 49 of the turntable 41 from a direction perpendicular to the vertical direction. The bonnet 46 covers at least the prime mover 5 and defines the second machine room M2. In this embodiment, the second machine room M2 houses equipment such as a radiator and an oil cooler in addition to the prime mover 5 (see Figure 3).

[0093] More specifically, the bonnet 46 includes a back portion 460 and a pair of side portions 461, 461 extending forward from both lateral ends of the back portion 460.

[0094] The back portion 460 is formed to follow the rear end of the turntable 41 (in this embodiment, the outer edge of the counterweight 48). Generally, part or all of the back portion 460 is openable and closable.

[0095] The pair of side sections 461, 461 are located between the rear of the cabin 42 and the turntable 41. That is, the pair of side sections 461, 461 of the bonnet 46 are positioned along the lateral side edges of the turntable 41. In this embodiment, the pair of side sections 461, 461, together with the lower end of the cabin 42, sandwich the outer edge of the bulkhead 7. As a result, the bonnet 46 covers the prime mover 5 and other equipment from the lateral and rear directions, and together with the bulkhead 7 defines the second machine room M2 that houses this equipment.

[0096] As shown in Figure 9, the work machine 1 of this embodiment is equipped with sound-absorbing material SA. The sound-absorbing material SA is attached to the surface of the central partition wall 700 facing the second machine room M2 (second wall 700b). In this embodiment, the sound-absorbing material SA is also attached to the surface of the lid member 73a facing the second machine room M2. The sound-absorbing material SA is made of a porous material. Specifically, the sound-absorbing material SA is a foamed resin material. The sound-absorbing material SA may be made of a material other than foamed resin that has sound-absorbing or sound-insulating properties, but in this embodiment, it is made of foamed polypropylene. It is preferable that the sound-absorbing material SA has heat-insulating properties that reduce the transfer of heat from the prime mover 5 chamber to the driver's cab DR.

[0097] As described above, the work machine 1 of this embodiment has a partition wall 7 positioned between the driver's seat DS and the prime mover 5, thereby suppressing the transmission of sound and heat from the prime mover 5 to the driver's seat DS. In particular, the partition wall 7 of this embodiment includes a hollow partition wall body 70 and a foamed material 71 filled inside the partition wall body 70, so a multi-layered partition is positioned between the driver's cab DR and the prime mover 5, and the foamed material 71 blocks sound and heat. Furthermore, because the foamed material 71 is filled inside the hollow partition wall body 70, the partition wall body 70 and the foamed material 71 become integrated, increasing the rigidity of the entire partition wall 7 and providing sufficient strength.

[0098] Next, a working machine according to a second embodiment of the present invention will be described.

[0099] As shown in Figures 14 and 15, the work machine 1 of this embodiment has a configuration common to the work machine 1 of the first embodiment. Accordingly, in the following description, the same names and reference numerals will be used for components that are the same as or equivalent to those described in the first embodiment. Furthermore, this section will describe components that differ from the work machine 1 of the first embodiment, and components that were not mentioned in detail in the first embodiment. Components that are the same as (common) the work machine 1 of the first embodiment will be referred to in the description of the first embodiment, and will not be described here. Components that are common to the first embodiment and are mentioned here may be referred to in the description of the first embodiment.

[0100] The difference between the work machine 1 of this embodiment and the work machine 1 of the first embodiment lies in the partition wall and the configuration associated with the partition wall. Specifically, the work machine 1 of the first embodiment had one partition wall 7 positioned between the prime mover 5 and the driver's seat DS, but the work machine 1 of this embodiment, as shown in Figure 16, has a first metal partition wall 6 positioned between the prime mover 5 and the driver's seat DS, and a second resin partition wall 7 positioned opposite the first partition wall 6. That is, between the second machine room (prime mover room) M2 where the prime mover 5 is located and the driver's cab DR where the driver's seat DS is located, a first partition wall 6 and a second resin partition wall (cover) 7 that covers the first partition wall 6 from the driver's seat DS side are provided as partition walls separating the second machine room (prime mover room) M2 and the driver's cab DR. The first partition wall 6 and the second partition wall 7 are supported by a structure (support) 8. Accordingly, in this embodiment, in addition to the first partition wall 6 and the second partition wall 7, only the supporting structure (support) 8 and related configurations will be described.

[0101] The first bulkhead 6 is supported (fixed) to a structure 8 which is fixed to the turntable 41 (base plate 410), and the second bulkhead 7 covers the first bulkhead 6, which is supported by the structure 8, from the driver's cab DR side.

[0102] As shown in Figures 17 to 19, the structure 8 comprises a pair of front legs (hereinafter referred to as first support legs) 80a, 80a arranged at intervals in the lateral direction, and a leg connecting portion 81 that connects the pair of first support legs 80a, 80a.

[0103] The structure 8 includes a pair of first support legs 80a, 80a and a leg connecting portion 81, as well as a pair of rear leg portions (hereinafter referred to as second support legs) 80b, 80b connected to the leg connecting portion 81 and extending downward and rearward from the leg connecting portion 81. Furthermore, the structure 8 includes a connecting piece portion 80c that extends in the front-rear direction and connects the first support leg 80a (front leg portion 80a) and the second support leg 80b (rear leg portion 80b).

[0104] The lower end of the first support leg 80a (front leg portion 80a) is connected to a support member 414 erected on the base plate 410. Specifically, the work machine 1 is equipped with a support member (hereinafter referred to as a common support member) 414 that supports the step 49 and the structure 8. The common support member 414 includes a plate-shaped plate leg 414a erected along the boundary between the first arrangement area A1 and the second arrangement area A2 of the base plate 410, a first receiving portion 414b that receives the rear end of the step 49 and protrudes forward from the plate leg 414a, and a second receiving portion 414c that is a support block 414c that receives the front leg portion 80a of the structure 8 and protrudes rearward from the plate leg 414a. In this embodiment, the plate leg 414a is also used as a partition plate 414a that separates (divides) the first machine room M1 and the second machine room M2.

[0105] The shared support member 414 includes two second receiving portions 414c, and the two second receiving portions 414c, 414c are spaced laterally apart to correspond to the spacing between the pair of first support legs 80a, 80a. In this embodiment, the first receiving portion 414b and the second receiving portion 414c are connected to the upper ends of the plate legs 414a, supporting the step 49 and the first support legs 80a (front leg portions 80a) at a position above the base plate 410. Accordingly, the pair of first support legs 80a, 80a (front leg portions 80a) supported by the support member 413 are positioned along the boundary between the first arrangement area A1 and the second arrangement area A2.

[0106] In this embodiment, each of the pair of first support legs 80a, 80a (front leg portion 80a) includes a first portion (upright portion) 800a that stands upright in the vertical direction, and a second portion (inclined portion) 800b connected to the upper end of the first portion 800a and inclined towards the rear as it extends upward. In this embodiment, each of the pair of first support legs 80a, 80a further includes a third portion (upper upright portion) 800c connected to the upper end of the second portion 800b and standing upright in the vertical direction. The first partition wall 6 is positioned in close contact with the front-facing surfaces of the first portion 800a and the second portion 800b. In contrast, the first partition wall 6 is positioned at a distance from the front-facing surface of the third portion 800c. Accordingly, the third portion 800c is provided with a forward-projecting protrusion (hereinafter referred to as the position-determining protrusion) 800d (see Figures 17 and 19), and the first partition wall 6 comes into contact with the position-determining protrusion 800d, thereby maintaining a constant distance between the first partition wall 6 and the third portion 800c.

[0107] The lower end of the first support leg 80a (front leg portion 80a) (first portion 800a) is connected to and supported by a support member 414 that supports the rear end of step 49. That is, the first support leg 80a, 80a (front leg portion 80a) (first portion 800a) is supported by a support member 414 positioned along the boundary between the first placement area A1 and the second placement area A2.

[0108] The lower end of the second support leg 80b (rear leg portion 80b) is directly or indirectly supported by the rear end of the base plate 410 and extends in the vertical direction (approximately perpendicular to the turntable 41 (base plate 410)). In this embodiment, the lower end of the second support leg 80b (rear leg portion 80b) is connected and supported by a rear end support member 47 erected on the rear end of the base plate 410. The rear end support member 47 is a leg portion 47a erected along the rear end of the base plate 410, and includes a leg portion 47a that includes a rear leg connecting portion 470a that connects one of the second support legs 80b, and a receiving portion 47b that is positioned laterally apart from the rear leg connecting portion 470a and receives the other second support leg 80b, and is connected to the leg portion 47a. In this embodiment, one second support leg 80b is directly screw-fixed to the rear leg connecting portion 470a of the leg portion 47a, but another receiving portion 47b may be connected to the leg portion 47a and supported by the receiving portion 47b in the same way as the other second support leg 80b.

[0109] The front end of the connecting piece 80c is connected to the upper end of the third portion 800c. The connecting piece 80c extends to the rear, and its rear end in the front-rear direction is connected to the upper end of the second support leg (rear leg portion) 80b. In this embodiment, the connecting piece 80c connected to one of the second support legs 80b is inclined downwards towards the rear (rear leg portion 80b side), while the connecting piece 80c connected to the other second support leg 80b is formed in a plate shape.

[0110] The pair of connecting pieces 80c, 80c are set to the same or approximately the same height (maximum height). While the pair of connecting pieces 80c, 80c may of the same form, in this embodiment they are of different forms. Specifically, in this embodiment, one of the pair of connecting pieces 80c, 80c is a dedicated member for supporting the first partition wall 6, while the other connecting piece 80c, 80c has the function of supporting equipment located in the second machine room M2 in addition to supporting the first partition wall 6. Accordingly, as described above, the forms of the pair of connecting pieces 80c, 80c are different. Furthermore, one second support leg 80b and one connecting piece 80c are integrally formed, while the other second support leg 80b and the other connecting piece 80c are constructed by combining multiple parts.

[0111] The leg connecting portion 81 has one end connected to a connecting piece 80c that is connected to one of the second support legs 80b, and extends horizontally so that the other end is connected to a connecting piece 80c that is connected to the other second support leg 80b.

[0112] The rear end portion BE of the cabin 42 is connected to the leg connection portion 81 of the structure 8 via a vibration isolation device (vibration isolation mechanism) 9. In this embodiment, two laterally spaced locations on the rear end portion of the cabin 42 are supported by the leg connection portion 81, which will be described later, via the vibration isolation device (vibration isolation mechanism) 9 (see Figure 13). The vibration isolation device (vibration isolation mechanism) 9 has the same configuration as the vibration isolation device 9 of the first embodiment.

[0113] Specifically, each vibration isolation device (vibration isolation mechanism) 9 includes an elastic member 90 positioned on the leg connecting portion 81, and a stud bolt 91 that is screwed into the leg connecting portion 81 so as to stand vertically or substantially vertically with respect to the upper surface (positioning surface) of the leg connecting portion 81, and the stud bolt 91 penetrates the elastic member 90 on the leg connecting portion 81 and the rear end BE of the cabin 42. The rear end BE of the cabin 42 is positioned on the elastic member 90, and the stud bolt 91 penetrates the rear end BE of the cabin 42.

[0114] Accordingly, the female threaded member 92 is screwed onto the stud bolt 91, restricting the upward movement (lifting) of the cabin 42, and the vertical movement (vibration) is absorbed by the elastic deformation of the elastic member 90. The vibration isolation device (vibration isolation mechanism) 9 shown in Figure 20 includes a pair of elastic members 90, 90 that sandwich the rear end BE of the cabin 42 from above and below, each formed in a flange shape, a cylindrical vibration isolation collar 93 positioned between the pair of elastic members 90, 90 and loosely fitted into a hole formed in the rear end BE of the cabin 42, and a pair of washer members 94, 94 that sandwich the pair of elastic members 90, 90, each formed in a flange shape, and the female threaded member 92 is screwed onto these with the stud bolt 91 inserted through them. As described above, the vibration-damping collar 93 is interposed between the pair of elastic members 90, 90, preventing each elastic member 90, 90 from being excessively compressed.

[0115] The first bulkhead 6 is made of metal and is a soundproof wall designed to suppress the propagation of sound from inside the second machine room (prime motor room) M2 (such as the driving noise of the prime mover 5) into the driver's cab DR. In this embodiment, as shown in Figure 21, the first bulkhead 6 has a first opening 60 that penetrates from the driver's seat DS side (driver's cab DR side) to the prime mover 5 side (second machine room (prime motor room) M2 side).

[0116] The first partition wall 6 is positioned to close (block) the space between the pair of first support legs 80a, 80a (front leg portions 80a, 80a) that constitute the structure 8, and is attached to the pair of first support legs 80a, 80a (front leg portions 80a, 80a).

[0117] Specifically, the first partition wall 6 of this embodiment includes an upright partition wall portion 61 covering the region between the first portions 800a of a pair of first support legs 80a, 80a, an inclined partition wall portion 62 covering the region between the second portions 800b of a pair of first support legs 80a, 80a, and an upper upright partition wall portion 63 covering the region between the third portions 800c of a pair of first support legs 80a, 80a. Thus, the first partition wall 6 of this embodiment includes multiple regions with different orientations (upright partition wall portion 61, inclined partition wall portion 62, and upper upright partition wall portion 63), and is formed by bending a single metal plate.

[0118] Furthermore, since the first partition wall 6 of this embodiment includes multiple regions with different orientations (upright partition wall portion 61, inclined partition wall portion 62, and upper upright partition wall portion 63), the first partition wall 6 of this embodiment is provided with a first opening 60, which is a first large opening 60a formed across the upright partition wall portion 61 and the inclined partition wall portion 62, and a first small opening 60b formed in the inclined partition wall portion 62. In the first partition wall 6 with the above configuration, as shown in Figure 22, the upright partition wall portion 61 is aligned with the front surface of the first portion 800a, and the inclined partition wall portion 62 is aligned with the front surface of the second portion 800b. In this state, the upper upright partition wall portion 63 is in close contact with the positional protrusion 800d and maintains a parallel or substantially parallel orientation with respect to the front surface of the third portion 800c, with a gap between them.

[0119] As shown in Figure 23, the second bulkhead 7 has a second opening 72 that penetrates from the driver's seat DS side (driver's cab DR side) to the prime mover 5 side (second machine room (prime mover room) M2 side), and the second opening 72 is formed at a position corresponding to the first opening 60 (60a, 60b) formed in the first bulkhead 6. The second bulkhead 7 is formed in a hollow shape. Specifically, as shown in Figures 24 and 25, the second bulkhead 7 includes opposing wall portions 70a, 70b that are spaced apart and face each other, and has a hollow portion HO between the opposing wall portions 70a, 70b.

[0120] The second bulkhead 7 includes, as opposing wall portions 70a and 70b facing each other, a second wall 70b (700b, 702b, 703b) facing the first bulkhead 6, and a first wall 70a (700a, 702a, 703a) positioned on the driver's seat DS side of the second wall 70b (700b, 702b, 703b), which is positioned at a distance from the second wall 70b (700b, 702b, 703b). Furthermore, the second partition wall 7 includes peripheral wall portions 700c, 701c, and 702c that connect the peripheral edges of the first wall 70a (700a, 702a, 703a) and the peripheral edges of the second wall 70b (700b, 702b, 703b) (connecting the peripheral edges of the opposing wall portions 70a and 70b) in order to maintain the distance between the first wall 70a (700a, 702a, 703a) and the second wall 70b (700b, 702b, 703b) (forming a hollow portion HO). Accordingly, the outer surfaces of the first walls 700a, 702a, and 703a include a design surface D that has been shaped by irregularities. The second partition wall 7 is a resin molded product. Specifically, the second partition wall 7 may be formed by injection molding or the like, but in this embodiment, it is formed into a predetermined shape by blow molding.

[0121] Since the second partition wall 7 covers the first partition wall 6, in this embodiment, at least the surface of the second partition wall 7 facing the first partition wall 6 (the outer surface of the second wall 70b (700b, 702b, 703b)) is formed in accordance with the shape of the first partition wall 6. Specifically, the second partition wall 7 includes a first portion 7a facing the upright partition wall portion 61, a second portion 7b corresponding to the inclined partition wall portion 62, and a third portion 7c facing the upper upright partition wall portion 63. In addition, in this embodiment, the second partition wall 7 includes a fourth portion 7d facing the leg connecting portion 81.

[0122] Furthermore, the second partition wall 7 is a pair of fifth parts 7e connected to the lateral ends of the first part 7a and the second part 7b, and further includes a pair of fifth parts 7e, 7e each extending forward from the first part 7a and the second part 7b. As is clear from Figures 24 and 25, the first part 7a, the second part 7b, and the third part 7c, when integrated, constitute the central partition wall 700. The fourth part 7d constitutes the rearward extension 702, and the pair of fifth parts 7e constitute the pair of side partition wall parts 701, 701.

[0123] In this embodiment 7, as described above, the second partition wall 7 is formed by blow molding, so the hollow portion HO of the first portion 7a, the hollow portion HO of the second portion 7b, the hollow portion HO of the third portion 7c, the hollow portion HO of the fourth portion 7d, and the hollow portion HO of the fifth portion 7e are continuous. That is, the first portion 7a, the second portion 7b, the third portion 7c, and the fourth portion 7d are each formed continuously, although in different orientations. In this embodiment, the pair of fifth portions 7e, 7e are also formed continuously with respect to the first portion 7a and the second portion 7b. As a result, the entire second partition wall 7 is integrally molded.

[0124] In other words, in each of the first portion 7a, second portion 7b, third portion 7c, and fourth portion 7d, the second partition wall 7 includes opposing wall portions 70a, 70b (700a, 700b, 701a, 701b, 702a, 702b) that are spaced apart and facing each other, and a hollow portion HO is formed between the opposing wall portions 70a, 70b (700a, 700b, 701a, 701b, 702a, 702b), and the hollow portion HO in the first portion 7a, second portion 7b, third portion 7c, and fourth portion 7d is a continuous space.

[0125] Furthermore, since the second partition wall 7 includes multiple regions with different orientations (first portion 7a, second portion 7b, and third portion 7c), the second partition wall 7 in this embodiment is provided with a second opening 72, which is a second large opening 72a formed across the first portion 7a and the second portion 7b, and a second small opening 72b formed in the second portion 7b.

[0126] The second large opening 72a is formed in correspondence with the first large opening 60a of the first bulkhead 6. In this embodiment, the second large opening 72a is also provided in a position facing the back of the driver's seat DS, which is fixed on the step 49. That is, the second large opening 72a is used as an inspection port when performing maintenance, and under normal conditions, the second large opening 72a (the first cover member 73a, described later) is concealed by the driver's seat DS. In other words, the second bulkhead 7 has a design surface D in the area that avoids the second large opening 72a and is exposed inside the driver's cab DR, on which a predetermined design is expressed by irregularities. As described above, since the second large opening 72a (the first cover member 73a, described later) is concealed by the driver's seat DS, when performing maintenance, the driver's seat DS is removed to expose the second large opening 72a (the first cover member 73a, described later).

[0127] The second partition wall 7 has a fixing portion 707. In this embodiment, the second partition wall 7 is fixed to the step 49 and the structure 8 (leg connecting portion 81), which is the structure 8.

[0128] Specifically, the work machine 1 comprises support members 49, 8 (81) that support the second bulkhead 7, a cylindrical collar 10, and a male screw member 11 including a threaded portion 11a and a head 11b, wherein the threaded portion 11a is inserted through the collar 10 and screwed into the structure.

[0129] In this embodiment, the area of ​​the surface of the second partition wall 7 facing the first partition wall 6 is set to be larger than the area of ​​the surface of the first partition wall 6 facing the second partition wall 7. As a result, a non-facing portion is formed at the periphery of the second partition wall 7 that does not face the first partition wall 6. That is, a non-facing portion is formed at the periphery of the second partition wall 7 that extends beyond the first partition wall 6. Accordingly, the fixing portion 707 is provided at the non-facing portion of the second partition wall 7.

[0130] In this embodiment, the second partition wall 7 includes a fixing portion 707, which is a first fixing portion 707a provided at the lower end and a second fixing portion 707b provided at the upper end. Specifically, the second partition wall 7 includes a first fixing portion 707a connected to the lower ends of the first portion 7a and the fifth portion 7e, and a second fixing portion 707b provided at the third portion 7c.

[0131] As shown in Figures 26 and 27, the first fixing portion 707a and the second fixing portion 707b are positioned to overlap the upper surface of the structure (step 49 or leg connecting portion 81). Specifically, the first fixing portion 707a is provided projecting forward from the lower end of the first portion 7a so as to overlap the step 49 in the vertical direction, and the second fixing portion 707b is provided on the fourth portion 7d so as to overlap the leg connecting portion 81 in the vertical direction.

[0132] As described above, since the entire second partition wall 7 is formed by blow molding, the first fixing portion 707a and the second fixing portion 707b each include opposing wall portions 70a and 70b that face each other. Specifically, the first fixing portion 707a includes opposing wall portions 70a and 70b that are spaced apart in the vertical direction. In contrast, the second fixing portion 707b is formed in part of the fourth portion 7d, and accordingly, the second fixing portion 707b also includes opposing wall portions 70a and 70b that are spaced apart in the vertical direction.

[0133] Step 49 has a screw hole 49a formed at a position corresponding to the first fixing part 707a. Similarly, the leg connecting part 81 has a screw hole 81a formed at a position corresponding to the second fixing part 707b. The screw hole 49a of step 49 is the screw hole of the back nut fixed to step 49. Accordingly, step 49 is provided with through holes (not numbered) corresponding to the screw holes 49a and 49b of the back nut. In contrast, the screw hole 81a of the leg connecting part 81 is a tapped hole.

[0134] Based on this premise, the fixing portion 707 is provided with through holes formed by holes 75a, 75b provided in the first walls 700a, 702a and the second walls 700b, 702b, and hole wall portions 76a, 76b connecting the peripheral edges of each hole 75a, 75b, and the second partition wall 7 is fixed to the structure 8 by screw members 11 inserted through the through holes. Specifically, each of the first fixing portion 707a and the second fixing portion 707b has holes 75a and 75b provided concentrically in the opposing opposing wall portions 70a and 70b, respectively, and cylindrical hole wall portions 76a and 76b having an inner hole, which connect the opposing opposing wall portions 70a and 70b with the holes 75a and 75b and the inner hole in communication, and a through hole for inserting the screw member 11 is formed by the holes 75a and 75b and the inner hole of the hole wall portions 76a and 76b.

[0135] In both the first fixing portion 707a and the second fixing portion 707b, the collar 10 is inserted through the inner holes 75a, 75b and hole wall portions 76a, 76b of the opposing wall portions 70a, 70b, and the threaded portion 11a of the male screw member 11 inserted through the collar 10 is screwed into the support members 49, 8 (81), while the head 11b is positioned away from the second partition wall 7. As a result, even when the threaded portion 11a of the male screw member 11 is screwed into the threaded holes 49a, 49b of the support members 49, 8 (81) (tightened), the head 11b of the male screw member 11 does not directly tighten (press) the hollow second partition wall 7, thereby preventing deformation of the second partition wall 7. An elastic cushion member 12 is interposed between the step 49 and the first fixing portion 707a (see Figure 26). As a result, the first fixing portion 707a is pushed (pushed up) toward the head 11b side of the male screw member 11 by the elasticity of the cushioning member 12.

[0136] As shown in Figures 23 and 28, a relief hole 706 is formed in the fourth portion 7d of the second bulkhead 7, into which a vibration damping device (vibration damping mechanism) 9 can be installed. In other words, a relief hole 706 is formed in the fourth portion 7d of the second bulkhead 7, into which the elastic member 90 of the vibration damping device (vibration damping mechanism) 9 can be loosely fitted. As a result, even when the rear end of the cabin 42 is positioned on the fourth portion 7d, the rear end of the cabin 42 is supported by the elastic member 90 of the vibration damping device (vibration damping mechanism) 9, preventing the load of the cabin 42 from acting on the second bulkhead 7 (third portion 7c).

[0137] Based on the above arrangement, the work machine 1 is equipped with a sealing member 85 to fill the gap, as shown in Figure 28. Specifically, the sealing member 85 is interposed between the first partition wall 6 and the second partition wall 7. Furthermore, the work machine 1 is equipped with a metal lid member 73 that overlaps the second partition wall 7. That is, the work machine 1 is equipped with a metal lid member 73 that overlaps the second partition wall 7 when the second opening 72 is closed.

[0138] The sealing member 85 is in close contact with the first partition wall 6 and the second partition wall 7. That is, the sealing member 85 fills the gap formed between the first partition wall 6 (metal plate) and the second partition wall 7. Specifically, the sealing member 85 is an elastically deformable (cushioning) foamed resin material, and by restoring through elastic deformation, it comes into close contact with the first partition wall 6 and the second partition wall 7. As a result, the sealing member 85 fills the gap between the first partition wall 6 and the second partition wall 7, preventing sound leakage.

[0139] In this embodiment, a first opening 60 is formed in the first partition wall 6, and a second opening 72 is formed in the second partition wall 7. Therefore, the sealing member 85 is positioned to surround the entire or partial outside of the first opening 60 and the entire or partial outside of the second opening 72. In this embodiment, as described above, the first partition wall 6 has a first large opening 60a and a first small opening 60b as the first opening 60, and the second partition wall 7 has a second large opening 72a and a second small opening 72b as the second opening 72. Accordingly, the sealing member 85 is positioned to surround the first large opening 60a and the first small opening 60b together, and to surround the second large opening 72a and the second small opening 72b together. As a result, the sealing member 85 fills the gap between the outside of the first opening 60 (first large opening 60a and first small opening 60b) and the outside of the second opening 72 (second large opening 72a and second small opening 72b), preventing sound from the second machine room (prime motor room) M2 side, which is propagated around the first bulkhead 6, from leaking out to the driver's seat DS side (through the second opening 72).

[0140] The cover member 73 closes the second opening 72 by overlapping the peripheral edge of the second opening 72 with the driver's seat DS side surface. The cover member 73 is made of a metal plate. That is, like the first partition wall 6, the cover member 73 is made of a material with a large mass, thereby increasing the sound reflection efficiency.

[0141] In this embodiment, as described above, the second partition wall 7 has a second large opening 72a and a second small opening 72b as the second opening 72, so the work machine 1 is equipped with a lid member 73 which includes a first lid member 73a that closes the second large opening 72a and a second lid member 73b that closes the second small opening 72b.

[0142] Each of the first lid member 73a and the second lid member 73b is made of a material with high mass. In this embodiment, each of the first lid member 73a and the second lid member 73b is made of a metal plate, similar to the first partition wall 6. That is, in this embodiment, each of the first lid member 73a and the second lid member 73b is screw-fixed to the second partition wall 7. That is, each of the first lid member 73a and the second lid member 73b is provided with a through hole H for inserting a bolt B. Accordingly, the second partition wall 7 has a screw hole SH into which the bolt B is screwed. Specifically, the second partition wall 7 has a female screw member (nut) integrally incorporated. Specifically, the second partition wall 7 is blow-molded as described above, but during this blow molding process, the female screw member (nut: not numbered) is mold-molded to be integrally incorporated. The arrangement of the screw holes SH in the female screw member (nut) corresponds to the arrangement of the through holes H in the first cover member 73a and the through holes H in the second cover member 73b.

[0143] More specifically, the first lid member 73a is set to be larger than the second large opening 72a. This ensures that when the first lid member 73a closes the second large opening 72a, the outer peripheral end of the first lid member 73a overlaps the outside of the second large opening 72a of the second partition wall 7. Accordingly, the outer peripheral end of the first lid member 73a is provided with multiple through holes H... for inserting bolts B, and around the second large opening 72a of the second partition wall 7, female threaded members (nuts) are embedded (molded) in a state corresponding to the arrangement of the multiple through holes H.... This ensures that the first lid member 73a is fixed in a closed state when the bolts B inserted through the through holes H of the first lid member 73a are screwed into the threaded holes SH (female threaded members (nuts)) of the second partition wall 7.

[0144] The second lid member 73b is set to be larger than the second small opening 72b. This ensures that when the second lid member 73b closes the second small opening 72b, the outer peripheral end of the second lid member 73b overlaps the outside of the second small opening 72b of the second partition wall 7. Accordingly, the outer peripheral end of the second lid member 73b is provided with multiple through holes H... for inserting bolts B, and around the second small opening 72b of the second partition wall 7, female threaded members (nuts) are embedded (molded) in a state corresponding to the arrangement of the multiple through holes H.... This ensures that the second lid member 73b is fixed in a closed state when the bolts B inserted through the through holes H of the second lid member 73b are screwed into the threaded holes SH (female threaded members (nuts)) of the second partition wall 7.

[0145] In this embodiment, the lower end of the first lid member 73a is fixed by a fixing bracket 77. The fixing bracket 77 is a plate-shaped bracket and is connected to the first partition wall 6 when superimposed on the lower end of the first lid member 73a. Specifically, the fixing bracket 77 has a through hole H1 through which a bolt B is inserted, and the second partition wall 7 (first portion 7a) has a through hole H2 through which the bolt B that has passed through the fixing bracket 77 is inserted. In addition, the lower end of the first partition wall 6 (first portion 800a) is provided with a screw hole (tapped hole) SH corresponding to the through hole H2 of the second partition wall 7.

[0146] In this embodiment, a cylindrical spacer 88 is positioned between the fixing bracket 77 and the first partition wall 6. That is, the work machine 1 has a spacer 88 that is inserted into the through hole H2 of the second partition wall 7. This keeps the distance between the fixing bracket 77 and the first partition wall 6, which are positioned on either side of the second partition wall 7 (first portion 7a), constant, and prevents the second partition wall 7 from being tightened and deformed even when the bolt B is tightened to fix the fixing bracket 77. The first lid member 73a is provided with a notch 730a at a position that avoids the fixing bracket 77, for passing wiring or piping through. A grommet (not shown) made of rubber or resin is fitted into the notch 730a to reduce sound leakage.

[0147] The work machine 1 of this embodiment is equipped with sound-absorbing material 65. The sound-absorbing material 65 is attached to the surface of the first partition wall 6 facing the second machine room (prime motor room) M2. In this embodiment, since the first partition wall 6 has a first opening 60 (first large opening 60a, first small opening 60b) corresponding to the second opening 72 (second large opening 72a, second small opening 72b), sound-absorbing material 66 is also attached to the surface of the lid members 73 (first lid member 73a, second lid member 73b) that close the second opening 72 (second large opening 72a, second small opening 72b) facing the second machine room (prime motor room) M2. Note that Figure 28 shows sound-absorbing material 66 applied only to the first lid member 73a of the lid member 73. The sound-absorbing material 66 attached to the lid member 73 is formed in a shape similar to the first opening 60 of the first partition wall 6, and as shown in Figure 29, it fits into the first opening 60, and together with the sound-absorbing material 65 attached to the first partition wall 6, blocks sound from the second machine room (prime motor room) M2 side.

[0148] The sound-absorbing materials 65 and 66 are made of porous material. Specifically, the sound-absorbing material 65 is a foamed resin material. In this embodiment, the sound-absorbing materials 65 and 66 are foamed urethane foam and are in close contact with the first partition wall 6. However, the material of the sound-absorbing materials 65 and 66 is not limited to this, and may be other foamed resins, or other materials that have sound-absorbing or sound-insulating properties. Furthermore, it is preferable that the sound-absorbing materials 65 and 66 have heat-insulating properties that reduce heat transfer from the second machine room (prime motor room) M2 to the driver's cab DR.

[0149] In the work machine 1 of this embodiment, the second bulkhead 7 is arranged as described above, so that the design surface D constitutes (forms) the design on the driver's seat DS side (inside the driver's cab DR). Furthermore, in the work machine 1 of this embodiment, as shown in Figures 1 and 2, parts 705, 705, and 702c of the second bulkhead 7 are exposed on the outer surface of the machine body 4 and form part of the exterior design of the machine body 4. Specifically, parts 705, 705, and 702c of the second bulkhead 7 are formed to be exposed to the outside from between the cabin 42 and the exterior body (bonnet) 46. That is, the cabin 42 and the exterior body 46 are configured so that a gap G of a predetermined design (shape) is formed between them, and parts 705, 705, and 702c of the second bulkhead 7 (parts of the outer peripheral end that constitutes the outline of the second bulkhead 7) fit into the gap G between the cabin 42 and the exterior body 46, becoming one with the exterior body 46 and forming the exterior design. In this embodiment, the gap G between the cabin 42 and the exterior body 46 is fitted into the fourth portion 7d and the continuous outer edges of the pair of fifth portions 7e, 7e of the second bulkhead 7, and the fourth portion 7d and the continuous outer edges of the pair of fifth portions 7e, 7e of the second bulkhead 7 are integrated with the exterior body (bonnet) 46 to form the exterior design.

[0150] The work machine 1 of this embodiment is as described above, and since the first bulkhead 6 supported by the structure 8 is covered by the hollow second bulkhead 7, a multi-layered partition is arranged between the driver's cab DR and the second machine room (prime motor room) M2. Furthermore, the first bulkhead 6, which is positioned between the driver's seat DS and the prime mover 5, is made of metal (metal plate) and has a large mass, so it reflects sound from the prime mover 5 side. This ensures quietness (comfort) on the driver's seat DS side.

[0151] Furthermore, in the work machine 1 of this embodiment, sound-absorbing materials 65 and 66 are attached to the first bulkhead 6, so that sound is absorbed (sound is attenuated) by the sound-absorbing materials 65 and 66 before it propagates to the first bulkhead 6, resulting in higher quietness compared to the case where only the first bulkhead 6 is present. In addition, since the second bulkhead 7 covering the first bulkhead 6 is made of resin, it can be designed more flexibly than metal or other materials that have processing limitations, resulting in a more aesthetically pleasing design on the driver's seat DS (driver's cab DR) side.

[0152] Furthermore, because the second partition wall 7 is formed in a hollow shape, a hollow section HO (air layer) is created within the second partition wall 7, making it possible to reduce weight while maintaining an aesthetically pleasing design. In other words, when irregularities are formed, the protruding parts become thicker. Therefore, if the design surface D is constructed with irregularities to enhance the aesthetic appeal, the second partition wall 7 tends to become heavier. However, the second partition wall 7 of the work machine 1 in this embodiment is formed in a hollow shape, thus achieving a high level of aesthetic appeal while reducing weight. In addition, because the second partition wall 7 is formed in a hollow shape, the hollow section HO becomes an air layer, improving heat insulation and suppressing the transfer of heat from the prime mover 5 to the driver's seat DS side.

[0153] It should be noted that the present invention is not limited to the embodiments described above, and can be modified as appropriate without departing from the spirit of the invention.

[0154] For example, in each of the above embodiments, a backhoe was described as an example of the work machine 1, but the work machine 1 is not limited to a backhoe. The work machine 1 may be other construction machinery, agricultural machinery, a UV (utility vehicle), etc. More specifically, the work machine 1 may be a tractor, skid steer loader, wheel loader, etc.

[0155] In the embodiments described above, the partition wall 7 and the second partition wall 7 were fixed with screws, but this is not the only way. For example, the partition wall 7 and the second partition wall 7 may be made positionable and then fixed via metal fittings (fixed by pressing).

[0156] Furthermore, the structure 8 supporting the partition wall 7, and the structure 8 supporting the first partition wall 6 and the second partition wall 7, are not limited to those described in the above embodiment, but may be of a different form (appearance).

[0157] In the first embodiment described above, the work machine 1 is equipped with a single partition wall 7 as a partition wall positioned between the prime mover 5 and the driver's seat DS. However, for example, the partition wall positioned between the prime mover 5 and the driver's seat DS may be equipped with (or include) multiple partition walls, and the partition wall positioned between the prime mover 5 and the driver's seat DS may be equipped with a single resin partition wall 7, as well as a resin partition wall, a metal partition wall 6, etc. That is, in addition to the partition wall 7 of the first embodiment, the first partition wall 6 of the second embodiment may also be provided.

[0158] In the first embodiment described above, the first fixing portion 707 was mentioned in relation to the fixing of the partition wall 7. However, the partition wall 7 may, of course, also include a first fixing portion (lower fixing portion) 707a and a second fixing portion (upper fixing portion) 707b as the fixing portion 707, similar to the second embodiment.

[0159] In the first embodiment described above, the partition wall 7 (partition wall body 70) was manufactured by blow molding, and in the second embodiment, the second partition wall 7 (partition wall body 70) was manufactured by blow molding; however, the invention is not limited to these methods. For example, the partition wall 7 and the second partition wall 7 may be manufactured by other molding methods such as injection molding. Furthermore, the partition wall 7 and the second partition wall 7 are not limited to being integrally molded parts, but may also be made by combining multiple resin-molded parts.

[0160] Inspection openings 72a and 72b are provided in the partition wall 7 (partition wall body 70), but the invention is not limited to this. Whether or not to include inspection openings 72a and 72b may be determined as appropriate, taking into consideration aesthetics and ease of operation.

[0161] In the two embodiments described above, openings 60 and 72 (first opening 60, second opening 72) that serve as inspection ports are provided in the first partition wall 6 and the second partition wall 7, but the invention is not limited thereto. Whether or not to include the openings 60 and 72 (first opening 60, second opening 72) can be determined as appropriate, taking into consideration aesthetics and workability.

[0162] In the two embodiments described above, the first partition wall 6 was made of a single metal plate, but it is not limited to this. For example, the first partition wall 6 may be made of two or more metal plates. That is, assuming that the first partition wall 6 is made of metal, it may be a double wall, a triple wall, or the like.

[0163] In the second embodiment described above, the second partition wall 7 (partition wall body 70) is hollow, but as in the first embodiment, the foamed material 71 may be filled inside the partition wall body 70 (hollow portion HO).

[0164] The above embodiments are as described above, and the present invention (preferred embodiments thereof) provides the work machine 1 described in the following items.

[0165] (Item 1-1) A work machine 1 comprising a prime mover 5, a driver's seat DS positioned at a distance from the prime mover 5, and a partition wall 7 positioned between the prime mover 5 and the driver's seat DS, wherein the partition wall 7 includes a hollow partition wall body 70 and a foamed material 71 filled inside the partition wall body 70.

[0166] According to the work machine 1 of item 1-1, the partition wall 7 separates the driver's seat DS side from the engine 5 side. The partition wall 7 includes a hollow partition wall body 70 and a foamed material 71 filled inside the partition wall body 70, and therefore exhibits heat insulation and sound insulation properties, suppressing or preventing the transmission of heat and sound from the engine 5 to the driver's seat DS side.

[0167] Furthermore, since the foamed material 71 is filled into the hollow partition wall body 70, the partition wall 7 becomes solid, resulting in a highly rigid partition wall 7. In other words, even if an external force (for example, a force applied by a worker pushing or stepping on it) is applied to the partition wall 7, the presence of the foamed material 71 inside the partition wall body 70 prevents the partition wall body 70 from freely deforming, resulting in increased rigidity of the entire partition wall 7. In particular, because the foamed material 71 has shock-absorbing and elastic properties, it can absorb external forces and impact forces applied to the partition wall 7, and can also restore itself even if deformation occurs. As a result, deformation and damage to the partition wall 7 are suppressed or prevented.

[0168] (Item 1-2) The partition wall body 70 is a resin molded body, as described in Item 1-1 of the work machine 1.

[0169] According to the work machine 1 of item 1-2, since the bulkhead body 70 is made of a resin molded body, the bulkhead 7 can be made lighter.

[0170] (Item 1-3) The work machine 1 according to any one of Items 1-1 to 1-4, comprising a structure 8 that supports the bulkhead 7, wherein the bulkhead 7 covers the structure 8 on the driver's seat DS side.

[0171] In the work machine 1 of item 1-3, the bulkhead 7 is supported by the structure 8, allowing the bulkhead 7 to be positioned stably. Furthermore, since the bulkhead 7 covers the structure 8 from the driver's seat DS side, the structure 8 is not exposed on the driver's seat DS side (for example, the driver's cab DR). In other words, the structure 8 is hidden by the bulkhead 7, improving the appearance on the driver's seat DS side.

[0172] (Item 1-4) The work machine 1 according to Item 1-3, further comprising an elastic sealing member 85 interposed between the partition wall 7 and the structure 8.

[0173] According to the work machine 1 of item 1-4, an elastic sealing member 85 is interposed between the partition wall 7 and the structure 8, thereby reducing vibrations and heat transmitted from the structure 8 to the partition wall 7.

[0174] (Item 1-5) The work machine 1 according to Item 1-3 or Item 1-4, comprising a traveling device 3 and a turntable 41 supported by the traveling device 3, the turntable 41 which is capable of rotating around an axis CL extending in the vertical direction, wherein the driver's seat DS, the prime mover 5, and the structure 8 are supported by the turntable 41.

[0175] According to the work machine 1 of item 1-5, the driver's cab DS, prime mover 5, and structure 8 are supported on the turntable 41 supported by the traveling device 3, so the relative positional relationship of the driver's cab DS, prime mover 5, and structure 8 is constant. Therefore, by having the structure 8 support the bulkhead 7, the arrangement of the bulkhead 7 is also constant in relation to the driver's cab DS, prime mover 5, and structure 8, so the bulkhead 7 is positioned in the appropriate location.

[0176] (Item 1-6) A work machine 1 according to any one of Items 1-1 to 1-7, comprising a cabin 42 that covers the driver's seat DS and defines the driver's cab DR, and a bonnet 46 that covers the prime mover 5 and defines the machine room, wherein the bulkhead 7 separates the driver's cab DR and the machine room.

[0177] According to the work equipment 1 of item 1-6, the bulkhead 7 separates the driver's cab DR from the machine room, thereby improving sound insulation and heat insulation inside the driver's cab DR (on the driver's seat DS side).

[0178] (Item 1-7) The outer edge of the bulkhead 7 is the work machine 1 described in Item 1-7, which is positioned between the cabin 42 and the bonnet 46.

[0179] According to the work machine 1 of item 1-7, the outer edge of the bulkhead 7 is positioned between the cabin 42 and the bonnet 46, so that the bulkhead 7 is adequately positioned in the entire area between the driver's cab DR and the machine room. This further enhances the sound insulation and heat insulation inside the driver's cab DR (driver's seat DS side).

[0180] (Item 1-8) The bulkhead body 70 includes first walls 700a, 701a, 702a arranged on the driver's seat DS side, and second walls 700b, 701b, 702b arranged on the prime mover 5 side, the second walls 700b, 701b, 702b facing the first walls 700a, 701a, 702a at a distance from each other, and the foam member 71 is filled between the first walls 700a, 701a, 702a and the second walls 700b, 701b, 702b. The work machine 1 according to any one of Items 1-1 to 1-9.

[0181] According to the work machine 1 of item 1-8, the first walls 700a, 701a, 702a and the second walls 700b, 701b, 702b of the partition wall body 70 are arranged in the direction in which the driver's cab DS and the prime mover 5 are aligned, and the foam material 71 is filled in between them. That is, in the direction in which the driver's cab DS and the prime mover 5 are aligned, the first walls 700a, 701a, 702a, the foam material 71, and the second walls 700b, 701b, 702b are arranged in that order, so that sound (sound waves) traveling from the prime mover 5 to the driver's cab DS can be properly and reliably attenuated.

[0182] (Item 1-9) The work machine 1 according to any one of Items 1-1 to 1-8, wherein the bulkhead body 70 has inspection openings 72a, 72b that penetrate from the driver's seat DS side to the prime mover 5 side, and the bulkhead 7 includes lid members 73a, 73b that close the inspection openings 72a, 72b.

[0183] According to the work machine 1 of item 1-9, even if inspection openings 72a and 72b are provided in the bulkhead body 70, when the inspection openings 72a and 72b are closed with the cover members 73a and 73b, the driver's seat DS side and the engine 5 side are separated (partitioned). As a result, the cover members 73a and 73b prevent the transmission of sound and heat from the engine 5 side. Furthermore, by removing the cover members 73a and 73b, the inspection openings 72a and 72b are opened, allowing access from the driver's seat DS side to the engine 5 side, and enabling maintenance and inspection of the engine 5 side.

[0184] (Item 1-10) The lid members 73a and 73b are formed in the shape of plates, as described in Item 1-9 of the work machine 1.

[0185] According to the work machine 1 of item 1-10, since the lid members 73a and 73b are formed in a plate shape, the inspection openings 72a and 72b can be closed despite the simple configuration.

[0186] (Item 1-11) The work machine 1 according to any one of Items 1-1 to 1-10, wherein the partition wall comprises a first partition wall 6 made of metal and a second partition wall 7 made of resin positioned opposite the first partition wall 6.

[0187] According to the work machine 1 of item 1-11, since the first bulkhead 6 is made of metal, the mass of the first bulkhead 6 is large, which contributes to the quietness on the driver's seat DS side. Furthermore, according to the work machine 1 of item 1-11, since the second bulkhead 7 made of resin is positioned opposite the first bulkhead 6, multiple walls are arranged between the prime mover 5 and the driver's seat DS, which can further enhance the quietness on the driver's seat DS side.

[0188] (Item 2-1) A work machine 1 comprising a prime mover 5, a driver's seat DS positioned at a distance from the prime mover 5, a first metal partition wall 6 positioned between the prime mover 5 and the driver's seat DS, and a second resin partition wall 7 positioned opposite the first partition wall 6.

[0189] According to the work machine 1 of item 2-1, the first bulkhead 6 positioned between the prime mover 5 and the driver's seat DS is made of metal, so the mass of the first bulkhead 6 is large, which contributes to the quietness on the driver's seat DS side. Furthermore, according to the work machine 1 of item 2-1, a second bulkhead 7 made of resin is positioned opposite the first bulkhead 6, so multiple walls are positioned between the prime mover 5 and the driver's seat DS, which can further enhance the quietness on the driver's seat DS side.

[0190] (Item 2-2) The work machine 1 according to Item 1-11 or Item 2-1, further comprising a sealing member 85 (85a) interposed between the first partition wall 6 and the second partition wall 7.

[0191] According to the work machine 1 of item 2-2, the gap G between the first partition wall 6 and the second partition wall 7 is filled by the sealing member 85 (85a), so sound leakage from the gap G is prevented and the sound insulation (soundproofing) effect is enhanced.

[0192] (Item 2-3) The work machine 1 according to any one of items 1-11, 2-1, or 2-2, wherein the first bulkhead 6 has a first opening 60 that penetrates from the driver's seat DS side to the engine 5 side, and the second bulkhead 7 has a second opening 72 that penetrates from the driver's seat DS side to the engine 5 side and is formed in a position that communicates with the first opening 60, and the work machine 1 according to any one of items 1-11, 2-1, or 2-2, wherein the first bulkhead 6 has a first opening 60 that penetrates from the driver's seat DS side to the engine 5 side, and the second bulkhead 7 has a second opening 72 that penetrates from the driver's seat DS side to the engine 5 side, and the second opening 72 is formed in a position that communicates with the first opening 60, and the work machine 1 according to any one of items 1-11, 2-1, or 2-2.

[0193] According to the work device 1 of item 2-3, access to the engine 5 side from the driver's seat DS side is possible through the first opening 60 and the second opening 72, allowing for efficient maintenance. In addition, since the cover member 73 that closes the second opening 72 closes the second opening 72, sound leakage from the first opening 60 and the second opening 72 is prevented, ensuring quietness on the driver's seat DS side.

[0194] (Item 2-4) The structure 8 supports the second partition wall 7, and the screw member 11 fixes the second partition wall 7 to the structure 8, wherein the second partition wall 7 comprises first walls 700a, 701a, 702a positioned opposite the first partition wall 6, second walls 700b, 701b, 702b positioned opposite the first walls 700a, 701a, 702a at a distance from each other, and the peripheral edges of the first walls 700a, 701a, 702a and the peripheral edges of the second walls 700b, 701b, 702b are connected, and a middle section is provided between the first walls 700a, 701a, 702a and the second walls 700b, 701b, 702b. The work machine 1 according to any one of items 1-11, 2-1 to 2-3, having a peripheral wall portion 71c that forms a void HO and a fixing portion 707 that is fixed to the structure 8 by the screw member 11, the fixing portion 707 having through holes formed by holes 75a, 75b provided in the first wall 700a, 702a and the second wall 700b, 702b and hole wall portions 76a, 76b that connect the peripheral edges of each of the holes 75a, 75b, and the second partition wall 7 is fixed to the structure 8 by the screw member 11 inserted through the through holes.

[0195] According to the work machine 1 of item 2-4, since the hole walls 76a and 76b are interposed between the head of the screw member 11 and the structure 8, the head of the screw member 11 is prevented from tightening and deforming the first walls 700a and 702a and the second walls 700b and 702b.

[0196] (Item 2-5) The working machine 1 according to Item 2-6, wherein the area of ​​the surface of the second partition wall 7 facing the first partition wall 6 is larger than the area of ​​the surface of the first partition wall 6 facing the second partition wall 7, and a non-facing portion that does not face the first partition wall 6 is formed on the periphery of the second partition wall 7, and the fixing portion 707 is provided on the non-facing portion.

[0197] According to the work machine 1 of item 2-5, the non-opposing portion of the second bulkhead 7 protrudes from the first bulkhead 6, and a fixing portion 707 is provided on this protruding portion, so the fixing position of the second bulkhead 7 by the screw member 11 is a position away from the first bulkhead 6.

[0198] (Item 2-6) The work machine 1 according to Item 2-4 or Item 2-5, wherein the structure 8 supports the first partition wall 6 and the second partition wall 7.

[0199] According to the work machine 1 of item 2-6, the first bulkhead 6 and the second bulkhead 7 are supported by a common structure 8, so they can be made into a single integrated structure.

[0200] (Item 2-7) The work machine 1 according to any one of Items 1-11, 2-1 to 2-6, comprising a machine body 4 on which the prime mover 5 and the driver's seat DS are mounted, wherein a part of the second bulkhead 7 is exposed on the outer surface of the machine body 4 and forms part of the exterior design of the machine body 4.

[0201] According to the work machine 1 of item 2-7, a portion of the second bulkhead 7 is exposed on the outer surface of the machine body 4 and forms part of the exterior design of the machine body 4, thus enhancing the exterior design without having to prepare separate parts to enhance the design.

[0202] (Item 2-8) The work machine 1 according to any one of items 1-11, 2-1 to 2-7, wherein at least a portion of the surface of the second bulkhead 7 on the driver's seat DS side forms a design surface visible from the driver's seat DS.

[0203] According to the work equipment 1 in item 2-8, the design aesthetics of the driver's seat DS side (for example, the interior of the driver's cab DR) are enhanced.

[0204] (Item 2-9) The first partition wall 6 is made of a metal plate, as described in any one of Items 1-11, 2-1 to 2-8.

[0205] According to the work machine 1 in item 2-9, the first bulkhead 6 is made of metal plates, and therefore, despite its simple structure, it exhibits effective sound insulation performance.

[0206] (Item 2-10) The second partition wall 7 is formed in a hollow shape, as described in any one of Items 2-1 to 2-9.

[0207] According to the work machine 1 of item 2-10, the second bulkhead 7 is formed in a hollow shape, which creates an air layer inside the second bulkhead 7. As a result, the air layer inside the second bulkhead 7 suppresses heat transfer from the prime mover 5, and an insulating effect is obtained on the driver's seat DS side. In addition, because there is an air layer inside the second bulkhead 7, the weight of the second bulkhead 7 can be reduced.

[0208] 1: Work machine 3: Traveling device 4: Body 5: Prime mover 6: First bulkhead 7: Bulkhead, second bulkhead 8: Structure (support) 41: Turntable (turning base) 42: Cabin (driver's seat protection device) 60: Opening (first opening) 70: Bulkhead body 70a: First wall 70b: Second wall 71: Foam member 72: Opening (second opening) 72a: Inspection port 72b: Inspection port 73: Cover member 73a: Cover member (first cover member) 73b: Cover member (second cover member) 85: Seal member 700a: First wall 700b: Second wall 701a: First wall 701b: Second wall 702a: First wall 702b : Second wall 703a : First wall 703b : Second wall 707 : Fixing part 707a : First fixing part 707b : Second fixing part CL : Axle line D : Design surface DR : Driver's cab DS : Driver's seat HO : Hollow part

Claims

1. A work machine comprising: a prime mover; a driver's seat positioned at a distance from the prime mover; and a partition wall positioned between the prime mover and the driver's seat, wherein the partition wall includes a hollow partition wall body and a foamed material filled within the partition wall body.

2. The work machine according to claim 1, wherein the partition wall body is a resin molded body.

3. The work machine according to claim 1, comprising a structure that supports the bulkhead, wherein the bulkhead covers the structure on the driver's seat side.

4. The work machine according to claim 3, further comprising an elastic sealing member interposed between the partition wall and the structure.

5. The work machine according to claim 3, comprising a traveling device and a turntable supported by the traveling device, the turntable being capable of rotating around an axis extending in the vertical direction, wherein the driver's seat, the prime mover, and the structure are supported by the turntable.

6. The work machine according to claim 1, comprising a cabin that covers the driver's seat and defines the driver's compartment, and a bonnet that covers the prime mover and defines the machine room, wherein the bulkhead separates the driver's compartment and the machine room.

7. The work machine according to claim 6, wherein the outer edge of the bulkhead is positioned between the cabin and the bonnet.

8. The work machine according to claim 1, wherein the partition wall body includes a first wall located on the driver's seat side and a second wall located on the prime mover side, the second wall being spaced apart from and facing the first wall, and the foam member is filled between the first wall and the second wall.

9. The work machine according to claim 1, wherein the bulkhead body has an inspection opening that penetrates from the driver's seat side to the engine side, and the bulkhead includes a cover member for closing the inspection opening.

10. The work machine according to claim 9, wherein the lid member is formed in the shape of a plate.

11. The work machine according to claim 1, wherein the partition wall comprises a first partition wall made of metal and a second partition wall which is the partition wall body and is positioned opposite the first partition wall.

12. A work machine comprising: a prime mover; a driver's seat positioned at a distance from the prime mover; a first metal bulkhead positioned between the prime mover and the driver's seat; and a second resin bulkhead positioned opposite the first bulkhead.

13. The work machine according to claim 11 or claim 12, further comprising a sealing member interposed between the first partition wall and the second partition wall.

14. The work machine according to any one of claims 11 to 13, wherein the first bulkhead has a first opening that penetrates from the driver's seat side to the engine side, the second bulkhead has a second opening that penetrates from the driver's seat side to the engine side and is formed at a position communicating with the first opening, and the work machine is provided with a cover member that closes the second opening while overlapping the surface from the driver's seat side.

15. A work machine according to any one of claims 11 to 14, comprising a structure for supporting the second partition wall, and a screw member for fixing the second partition wall to the structure, wherein the second partition wall has a first wall positioned opposite to the first partition wall, a second wall positioned opposite to the first wall at a distance from it, a peripheral wall portion connecting the peripheral edge of the first wall and the peripheral edge of the second wall to form a hollow portion between the first wall and the second wall, and a fixing portion fixed to the structure by the screw member, the fixing portion having a through hole formed by holes provided in the first wall and the second wall and a hole wall portion connecting the peripheral edges of each hole, and the second partition wall being fixed to the structure by the screw member inserted through the through hole.

16. The work machine according to claim 15, wherein the area of ​​the surface of the second partition wall facing the first partition wall is larger than the area of ​​the surface of the first partition wall facing the second partition wall, a non-facing portion that does not face the first partition wall is formed at the periphery of the second partition wall, and the fixing portion is provided at the non-facing portion.

17. The work machine according to claim 15, wherein the structure supports the first partition wall and the second partition wall.

18. The work machine according to any one of claims 11 to 17, comprising a machine body on which the prime mover and the driver's seat are mounted, wherein a part of the second bulkhead is exposed on the outer surface of the machine body and forms part of the exterior design of the machine body.

19. The work machine according to any one of claims 11 to 18, wherein at least a portion of the driver's seat side surface of the second bulkhead forms a design surface visible from the driver's seat.

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