Work equipment

Abstract

The present invention provides a work machine that can further enhance the quietness of the driver's seat. [Solution] The present invention comprises 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.

Description

Technical Field

[0001] The present invention relates to a working machine including a prime mover and a driver's seat on which an operator sits.

Background Art

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

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In the technology of Patent Document 1, by arranging a partition wall between the prime mover chamber and the driver's seat, the sound leaking from the prime mover chamber to the driver's seat side can be shielded, and the quietness of the driver's seat can be improved. However, in recent years, further improvement in the comfort of the driver's seat of the working machine has been demanded, and further improvement in the quietness of the driver's seat has been required.

[0005] Therefore, an object of the present invention is to provide a working machine capable of further enhancing the quietness of the driver's seat.

Means for Solving the Problems

[0006] The working machine of the present invention includes a prime mover, a driver's seat arranged at an interval from the prime mover, a first partition wall made of metal arranged between the prime mover and the driver's seat, and a second partition wall made of resin arranged opposite to the first partition wall.

Effects of the Invention

[0007] According to the present invention, the quietness of the driver's seat can be further enhanced. [Brief explanation of the drawing]

[0008] [Figure 1] Figure 1 is an overall perspective view of a work machine according to one embodiment of the present invention, as seen from the front. [Figure 2] Figure 2 is an overall perspective view of the work machine according to the same embodiment, seen from the rear. [Figure 3] Figure 3 is a cross-sectional view taken along line III-III in Figure 1. [Figure 4] Figure 4 is a schematic plan view of the slewing base of the work machine according to the same embodiment. [Figure 5] Figure 5 is a partial perspective view illustrating the configuration of the slewing base and its surroundings in the work machine according to the same embodiment. [Figure 6] Figure 6 is a partial perspective view including the support for the work machine according to the same embodiment, and is a partial perspective view taken from the front. [Figure 7] Figure 7 is a partial perspective view including the support for the work machine according to the same embodiment, and is a partial perspective view taken from the rear. [Figure 8] Figure 8 is a partial perspective view including the support body of the work machine according to the same embodiment, and is a partial perspective view taken from the front in a partially disassembled state. [Figure 9] Figure 9 is a cross-sectional view of the vibration isolation mechanism of the work machine according to the same embodiment. [Figure 10] Figure 10 is a perspective view of the bulkhead of the work machine according to the same embodiment, seen from the front. [Figure 11] Figure 11 is a cross-sectional view showing the bulkhead of the work machine according to the same embodiment incorporated into the support. [Figure 12] Figure 12 is a perspective view of the cover of the work machine according to the same embodiment, seen from the front. [Figure 13] Figure 13 is a cross-sectional view taken along line XIII-XIII in Figure 12. [Figure 14] Figure 14 is a cross-sectional view of Figure 12 from line XIV to XIV. [Figure 15]FIG. 15 is a cross-sectional view of a fixing portion (first fixing portion) of a working machine according to this embodiment. [Figure 16] FIG. 16 is a cross-sectional view of a fixing portion (second fixing portion) of a working machine according to this embodiment. [Figure 17] FIG. 17 is an exploded perspective view of the periphery of a partition wall and a cover of a working machine according to this embodiment. [Figure 18] FIG. 18 is a perspective view including a cross-section of the periphery of a partition wall and a cover of a working machine according to this embodiment.

MODE FOR CARRYING OUT THE INVENTION

[0009] Hereinafter, a working machine according to an embodiment of the present invention will be described with appropriate reference to the drawings. Since the working machine of this embodiment is capable of traveling, in the following description, the direction in which the working machine travels straight (the directions of forward and backward travel) will be referred to as the front-rear direction, and the direction orthogonal to the front-rear direction will be referred to as the lateral direction.

[0010] Specifically, as shown in FIGS. 1 and 2, the working machine 1 of this embodiment includes a travel device 2 capable of traveling, working devices 3a and 3b that perform predetermined work, and a machine body 4 supported by the travel device 2, and the machine body 4 supports the working devices 3a and 3b.

[0011] The working machine 1 of this embodiment includes a pair of travel devices 2 and 2 arranged on both lateral sides of the machine body 4. In this embodiment, a crawler-type travel device is adopted for each of the pair of travel devices 2 and 2, but a tire-type travel device may also be used. The travel device 2 includes a travel motor M as a drive source (see FIG. 3). In this embodiment, the travel motor M is a hydraulic motor.

[0012] The working machine 1 according to this embodiment is a backhoe, and as the working devices 3a and 3b, it includes a shovel device 3a (excavation device) and a dozer device 3b.

[0013] The excavator device 3a and the dozer device 3b are hydraulic. That is, the working machine 1 includes hydraulic cylinders S1, S2, S3 for operating the excavator device 3a and a hydraulic cylinder S4 for operating the dozer device 3b. Accordingly, as shown in FIG. 3, the working machine 1 is a hydraulic system including a hydraulic pump P that discharges hydraulic oil, and supplies hydraulic oil to the hydraulic cylinders S1, S2, S3 of the working devices 3a, 3b (excavator device 3a, dozer device 3b) and the hydraulic motor (travel motor) M of the traveling device 2.

[0014] The machine body 4 includes a traveling base 40 connected to a pair of left and right traveling devices 2, 2, and a swing base 41 disposed above the traveling base 40 and swingable about an axis CL extending in the vertical direction. The machine body 4 also includes an operator's seat protection device 42 disposed on the swing base 41 and defining an operator's cab DR (riding base).

[0015] A pair of traveling devices 2, 2 are attached to the traveling base 40. Thereby, the traveling base 40 is disposed between the pair of traveling devices 2, 2. Further, a dozer device 3b, which is a working device 3b, is connected to the traveling base 40. The dozer device 3b is located between the pair of traveling devices 2, 2 and extends forward of the traveling base 40.

[0016] The swing base 41 supports the operator's seat S, the prime mover 5, the operator's seat protection device 42, etc. The swing base 41 also supports an excavator device 3a, which is a working device 3a.

[0017] More specifically, the swing base 41 has a base plate 410 that supports the operator's seat protection device 42 and the prime mover 5, and a device support 411 that is attached to the base plate 410 and supports the working device (excavator device) 3a. ースプレート410と、ベースプレート410に取り付けられ、作業装置(ショベル装置)3aを支持する装置支持体411と、を有している。

[0018] <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 S 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, and the like.

[0019] Returning to Figure 3, the step 412, which constitutes the floor slab, is placed in the first placement area A1 of the base plate 410. The step 412 is a metal plate and is positioned above the upper surface of the base plate 410. Accordingly, as shown in Figure 5, multiple support members 413 and 414 are erected on the base plate 410 to support the step 412. The support members 413 and 414 are erected at multiple locations on the base plate 410, but their forms differ depending on where they are placed. As shown in Figure 3, the step 412 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, the step 412 is positioned with a gap in the vertical direction relative to the base plate 410. As a result, the step 412 forms a structure integrated with the base plate 410 via the support members 413 and 414.

[0020] The device support 411 is connected to the front end of the base plate 410. Consequently, the shovel device 3a connected to the device support 411 extends outward (forward) relative to the slewing base 41 (base plate 410). In this embodiment of the work machine 1 (backhoe), the orientation (position) of the device support 411 (work device 3a) changes as the slewing base 41 rotates, but the state in which the device support 411 (shovel device 3a) is positioned on the front side in the front-rear direction is the standard state (posture).

[0021] In this embodiment, the prime mover 5 drives the hydraulic pump P of the hydraulic system, and the hydraulic fluid discharged from the hydraulic pump P drives each part of the work machine 1 (travel motor M, slewing motor, swing cylinder, boom cylinder S1, arm cylinder S2, bucket cylinder S3, dozer lifting cylinder S4, etc.). The prime mover 5 is supported by the slewing base 41 and is located behind the driver's cab DR (driver's seat S). 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.

[0022] The driver's seat S is positioned on the step 412. In this embodiment, the driver's seat protection device 42 is a cabin 42 that covers the entire driver's seat S. Alternatively, the driver's seat protection device 42 may be a canopy including a roof that covers the top of the driver's seat S and support columns that support the roof.

[0023] The cabin 42 covers the entire first placement area A1 of the base plate 410 and defines the driver's cab DR, which includes the driver's seat S. The driver's cab DR (worker's living space) is defined by the step 412 which constitutes the floor (floorboard) on which the driver's seat S (seat) is placed, the second bulkhead 7 made of resin, and the cabin 42 which covers the driver's seat S on the step 412. Various devices are arranged inside the driver's cab DR, such as the work operation unit 44 (operating lever) for operating the work devices 3a and 3b, and the travel operation unit 45 (operating lever) for operating the travel device 2.

[0024] In this embodiment, the front end (forward end) FE of the cabin 42 is positioned along the front end (front end) of the step 412. 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 8, which will be described later. 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.

[0025] The second placement area A2 is covered by the exterior body 46. That is, the work machine 1 is equipped with an exterior body (bonnet) 46 that covers the equipment placed on the base plate 410. In this embodiment, the exterior body 46 covers equipment such as the prime mover 5, heat exchangers (radiator, oil cooler), fuel tank T1, and hydraulic oil tank T2, which are placed in the second placement area A2. As described above, as the step 412 is placed above the base plate 410, a space is formed between the step 412 and the base plate 410 in the first placement area A1, and various hydraulic system equipment (for example, the control valve unit CV) is placed in this space.

[0026] The work machine 1 of this embodiment includes a first metal partition wall 6 positioned between the prime mover 5 and the driver's seat S, and a second resin partition wall 7 positioned opposite the first partition wall 6. That is, between the prime mover chamber ER where the prime mover 5 is located and the driver's seat DR where the driver's seat S is located, there is a first partition wall 6 that separates the prime mover chamber ER and the driver's seat DR, and a second resin partition wall (cover) 7 that covers the first partition wall 6 from the driver's seat S side. The first partition wall 6 and the second partition wall 7 are supported by a support (structure) 8.

[0027] The first bulkhead 6 is supported (fixed) to a support 8 which is fixed to the slewing base 41 (base plate 410), and the second bulkhead 7 covers the first bulkhead 6, which is supported by the support 8, from the driver's cab DR side.

[0028] As shown in Figures 6 to 8, the support body 8 comprises a pair of support legs 80, 80 arranged at intervals in the lateral direction, and a leg connecting portion 81 that connects the pair of support legs 80, 80.

[0029] Each of the pair of support legs 80, 80 is provided with a front leg portion 80a positioned on the front side. Furthermore, each pair of support legs 80, 80 is provided with a rear leg portion 80b positioned behind the front leg portion 80a, and a connecting piece portion 80c extending in the front-rear direction and connecting the front leg portion 80a and the rear leg portion 80b.

[0030] The lower end of the front leg portion 80a is connected to a support member 414 erected on the base plate 410. Specifically, the work machine 1 includes a support member (hereinafter referred to as a common support member) 414 that supports the step 412 and the support body 8. The common support member 414 includes a plate-shaped plate leg 414a erected along the boundary between the first placement area A1 and the second placement area A2 of the base plate 410, a first receiving portion 414b that receives the rear end of the step 412 and protrudes forward from the plate leg 414a, and a second receiving portion 414c that receives the front leg portion 80a of the support body 8 and protrudes rearward from the plate leg 414a.

[0031] The common 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 a pair of support legs 80, 80. In this embodiment, the first receiving portion 414b and the second receiving portion 414c are connected to the upper end of the plate leg 414a, and the step 412 and the support leg 80 (front leg portion 80a) are connected The support is located above the base plate 410. Accordingly, the front legs 80a of the pair of support legs 80, 80 supported by the support member 413 are positioned along the boundary between the first placement area A1 and the second placement area A2.

[0032] In this embodiment, each of the pair of support legs 80, 80 has a front leg portion 80a which is upright in the vertical direction and an inclined portion 800b which is connected to the upper end of the upright portion 800a and slopes backward as it extends upward. In this embodiment, each of the pair of support legs 80, 80 further includes an upper upright portion 800c which is upright in the vertical direction and is connected to the upper end of the inclined portion 800b. The first partition wall 6 is positioned in close contact with the front-facing surfaces of the upright portion 800a and the inclined portion 800b. In contrast, the first partition wall 6 is positioned at a distance from the front-facing surface of the upper upright portion 800c. Accordingly, the upper upright portion 800c is provided with a forward-projecting protrusion (hereinafter referred to as the position-determining protrusion) 800d (see Figures 6 and 8), 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 upper upright portion 800c.

[0033] The lower end of the front leg portion 80a (upright portion 800a) is connected to and supported by a support member 413 that supports the rear end of the step 412. In other words, the front leg portion 80a (upright portion 800a) is supported by a support member 413 positioned along the boundary between the first placement area A1 and the second placement area A2.

[0034] The lower end of the 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 swivel base 41 (base plate 410)). In this embodiment, the lower end of the 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 the rear leg portion 80b of one support leg 80, and a receiving portion 47b that is positioned laterally apart from the rear leg connecting portion 470a and receives the rear leg portion 80b of the other support leg 80, and is connected to the leg portion 47a. In this embodiment, the rear leg portion 80b of one support leg 80 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 support leg 80.

[0035] The front end of the connecting piece 80c is connected to the upper end of the upper upright 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 rear leg portion 80b. In this embodiment, the connecting piece 80c slopes downward towards the rear (towards the rear leg portion 80b).

[0036] The connecting pieces 80c of the pair of support legs 80, 80 are set to the same or approximately the same height (maximum height). While the pair of support legs 80, 80 could of any form, in this embodiment they are different in form (appearance). Specifically, in this embodiment, one of the pair of support legs 80, 80 has its front leg portion 80a, rear leg portion 80b, and connecting piece portion 80c dedicated to supporting the first bulkhead 6. However, the other support leg 80, in addition to supporting the first bulkhead 6, also has the function of supporting equipment located within the engine room ER. Accordingly, the rear leg portion 80b and connecting piece portion 80c of the pair of support legs 80, 80 are different in form. Furthermore, one support leg 80 is formed integrally, while the other support leg 80 is constructed from a combination of multiple parts.

[0037] The leg connecting portion 81 has one end connected to the connecting piece 80c of one support leg 80, extends horizontally, and its other end is connected to the connecting piece 80c of the other support leg 80.

[0038] As shown in Figure 9, the rear end portion BE of the cabin 42 is connected to the leg connection portion 81 of the support 8 via the vibration isolation mechanism 9. In this embodiment, two points on the rear end portion of the cabin 42, spaced apart laterally, are supported by the leg connection portion 81 via the vibration isolation mechanism 9 (see Figure 17).

[0039] Each 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.

[0040] Accordingly, the female threaded member 92 is screwed onto the stud bolt 91, restricting the upward movement (lifting) of the cabin 42, and absorbing vertical movement (vibration) through the elastic deformation of the elastic member 90. The vibration damping mechanism 9 shown in Figure 9 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 damping collar 93 positioned between the pair of elastic members 90, 90, which is 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. 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.

[0041] The first bulkhead 6 is made of metal and is a soundproof wall designed to suppress the propagation of sound from the engine room ER (such as the driving noise of the engine 5) into the driver's cab DR. In this embodiment, as shown in Figure 10, the first bulkhead 6 has a first opening 60 that penetrates from the driver's seat S side (driver's cab DR side) to the engine 5 side (engine room ER side).

[0042] The first partition wall 6 is positioned to close (block) the space between the pair of support legs 80, 80 that constitute the support body 8, and is attached to the pair of support legs 80, 80.

[0043] Specifically, the first partition wall 6 of this embodiment includes an upright partition wall portion 61 that covers the area between the upright portions 800a of a pair of support legs 80, 80, an inclined partition wall portion 62 that covers the area between the inclined portions 800b of a pair of support legs 80, 80, and an upper upright partition wall portion 63 that covers the area between the upper upright portions 800c of a pair of support legs 80, 80. Thus, because the first partition wall 6 of this embodiment includes multiple areas with different orientations (upright partition wall portion 61, inclined partition wall portion 62, and upper upright partition wall portion 63), it is formed by bending a single metal plate.

[0044] Furthermore, since the first partition wall 6 of this embodiment includes multiple regions with different orientations (upright partition wall section 61, inclined partition wall section 62, and upper upright partition wall section 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 section 61 and the inclined partition wall section 62, and a first small opening 60b formed in the inclined partition wall section 62. In the first partition wall 6 with the above configuration, as shown in Figure 11, the upright partition wall section 61 is aligned with the front surface of the upright section 800a, and the inclined partition wall section 62 is aligned with the front surface of the inclined section 800b. In this state, the upper upright partition wall section 63 is in close contact with the positional convex section 800d and maintains a parallel or substantially parallel orientation with respect to the front surface of the upper upright section 800c, with a gap between them.

[0045] As shown in Figure 12, the second bulkhead 7 is a second opening 70 that penetrates from the driver's seat S side (driver's cab DR side) to the engine 5 side (engine room ER side), and has a second opening 70 formed at a position corresponding to the first opening 60. The second bulkhead 7 is formed in a hollow shape. Specifically, the second bulkhead As shown in Figures 13 and 14, 7 includes opposing wall portions 71, 71 that are spaced apart from each other and have a hollow portion 72 between the opposing wall portions 71, 71.

[0046] The second partition wall 7 includes, as opposing wall portions 71, 71 facing each other, a first wall 71a facing the first partition wall 6, and a second wall 71b positioned closer to the driver's seat S than the first wall 71a, and spaced apart from the first wall 71a. The second partition wall 7 also includes a peripheral wall portion 71c that connects the peripheral edge of the first wall 71a and the peripheral edge of the second wall 71b (connecting the peripheral edges of the opposing wall portions 71, 71) in order to maintain the gap between the first wall 71a and the second wall 71b (forming a hollow portion 72). Accordingly, the outer surface of the second wall 71b includes a design surface DS that has been given a predetermined shape by irregularities. The second partition wall 7 is a resin molded product. Specifically, the second partition wall 7 may be molded by injection molding or the like, but in this embodiment, it is molded into a predetermined shape by blow molding.

[0047] 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 first wall 71a) 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. 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.

[0048] As described above, in this embodiment 7, the second partition wall 7 is formed by blow molding, so the hollow portions 72 of the first portion 7a, the second portion 7b, the third portion 7c, the fourth portion 7d, and 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.

[0049] In other words, in this embodiment, the second partition wall 7 includes opposing wall portions 71, 71 that are spaced apart from each other in each of the first portion 7a, second portion 7b, third portion 7c, and fourth portion 7d, with a hollow portion 72 formed between the opposing wall portions, and the hollow portions 72 in the first portion 7a, second portion 7b, third portion 7c, and fourth portion 7d are continuous spaces.

[0050] Furthermore, since the second partition wall 7 includes multiple regions with different orientations (first section 7a, second section 7b, and third section 7c), the second partition wall 7 in this embodiment is provided with a second opening 70, which is a second large opening 70a formed across the first section 7a and the second section 7b, and a second small opening 70b formed in the second section 7b.

[0051] The second large opening 70a is formed in correspondence with the first large opening 60a of the first bulkhead 6. In this embodiment, the second large opening 70a is also provided at a position opposite to the back of the driver's seat S, which is fixed on the step 412. That is, the second large opening 70a is used as an inspection port when performing maintenance, and under normal conditions, the second large opening 70a (the first cover member 86a, described later) is concealed by the driver's seat S. In other words, the second bulkhead 7 has a design surface DS in the area that avoids the second large opening 70a 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 70a (the first cover member 86a, described later) is concealed by the driver's seat S, when performing maintenance, the driver's seat S is removed to expose the second large opening 70a (the first cover member 86a, described later).

[0052] The second partition wall 7 has a fixing portion 73 that is fixed to the structure. In this embodiment, the second partition wall 7 is fixed to the step 412, which is a structure, and to the support 8 (leg connecting portion 81), which is a structure.

[0053] Specifically, the work machine 1 comprises a structure 412,8(81) that supports 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.

[0054] 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 73 is provided at the non-facing portion of the second partition wall 7. In this embodiment, the second partition wall 7 includes a fixing portion 73, which is a first fixing portion 73a provided at the lower end and a second fixing portion 73b provided at the upper end. Specifically, the second partition wall 7 includes a first fixing portion 73a connected to the lower ends of the first portion 7a and the fifth portion 7e, and a second fixing portion 73b provided at the third portion 7c.

[0055] As shown in Figures 15 and 16, the first fixing part 73a and the second fixing part 73b are positioned to overlap the upper surface of the structure (step 412 or leg connecting part 81). Specifically, the first fixing part 73a is provided projecting forward from the lower end of the first part 7a so as to overlap the step 412 in the vertical direction, and the second fixing part 73b is provided on the fourth part 7d so as to overlap the leg connecting part 81 in the vertical direction.

[0056] As described above, since the entire second partition wall 7 is formed by blow molding, each of the first fixing portion 73a and the second fixing portion 73b includes opposing wall portions 71, 71 that face each other. Specifically, the first fixing portion 73a includes opposing wall portions 71, 71 that are spaced apart in the vertical direction. In contrast, the second fixing portion 73b is formed as part of the fourth portion 7d, and accordingly, the second fixing portion 73b also includes opposing wall portions 71, 71 that are spaced apart in the vertical direction.

[0057] Step 412 has a screw hole 412a formed at a position corresponding to the first fixing part 73a. Similarly, leg connecting part 81 has a screw hole 412b formed at a position corresponding to the second fixing part 73b. The screw holes 412a and 412b of step 412 are screw holes for the back nut fixed to step 412. Accordingly, step 412 is provided with through holes (not numbered) corresponding to the screw holes 412a and 412b of the back nut. In contrast, the screw holes 412a and 412b of leg connecting part 81 are tapped holes.

[0058] Based on this, the fixing portion 73 is provided with through holes formed by holes 75, 75 provided in the first wall 71a and the second wall 71b, and a hole wall portion 76 connecting the peripheral edges of each hole 75, 75, and the second partition wall 7 is fixed to the structure by screw members 11 inserted through the through holes. Specifically, each of the first fixing portion 73a and the second fixing portion 73b has holes 75, 75 provided concentrically in each of the opposing opposing wall portions 71, 71, and a cylindrical hole wall portion 76 having an inner hole, which connects the opposing opposing wall portions 71, 71 with the holes 75, 75 and the inner hole in communication, and a through hole for inserting the screw member 11 is formed by the holes 75, 75 and the inner hole of the hole wall portion 76.

[0059] In each of the first fixing portion 73a and the second fixing portion 73b, the collar 10 is inserted through the holes 75, 75 of the opposing wall portions 71, 71 and the inner holes of the hole wall portion 76, and the collar 10 is inserted With the threaded portion 11a of the inserted male screw member 11 screwed into the structure 412,8(81), the head 11b is restricted to a position spaced apart from the second partition wall 7. As a result, even when the threaded portion 11a of the male screw member 11 is screwed into (tightened) the threaded holes 412a,412b of the structure 412,8(81), the head 11b of the male screw member 11 does not directly tighten (press) against 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 412 and the first fixing portion 73a (see Figure 15). As a result, the first fixing portion 73a is pushed (pushed up) towards the head 11b of the male screw member 11 by the elasticity of the cushion member 12.

[0060] As shown in Figures 12 and 17, a relief hole 77 is formed in the fourth portion 7d of the second bulkhead 7, into which the vibration isolation mechanism 9 can be installed. In other words, a relief hole 77 is formed in the fourth portion 7d of the second bulkhead 7, into which the elastic member 90 of the vibration isolation 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 isolation mechanism 9, preventing the load of the cabin 42 from acting on the second bulkhead 7 (third portion 7c).

[0061] Based on the above arrangement, the work machine 1 is equipped with a sealing member 85 to fill the gap, as shown in Figure 17. 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 86 that overlaps the second partition wall 7. That is, the work machine 1 is equipped with a metal lid member 86 that overlaps the second partition wall 7 when the second opening 70 is closed.

[0062] 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.

[0063] In this embodiment, a first opening 60 is formed in the first partition wall 6, and a second opening 70 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 70. 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 70a and a second small opening 70b as the second opening 70. Accordingly, the sealing member 85 is positioned to surround the first large opening 60a and the first small opening 60b together, and is also positioned to surround the second large opening 70a and the second small opening 70b 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 70 (second large opening 70a and second small opening 70b), preventing sound from the engine room ER side that propagates around the first bulkhead 6 from leaking out to the driver's seat S side (through the second opening 70).

[0064] The cover member 86 closes the second opening 70 by overlapping the peripheral edge of the second opening 70 with the driver's seat S side surface. The cover member 86 is made of a metal plate. That is, like the first partition wall 6, the cover member 86 is made of a material with a large mass, thereby increasing the sound reflection efficiency.

[0065] In this embodiment, as described above, the second partition wall 7 has a second large opening 70a and a second small opening 70b as the second opening 70, so the work machine 1 is equipped with a lid member 86 which includes a first lid member 86a that closes the second large opening 70a and a second lid member 86b that closes the second small opening 70b.

[0066] Each of the first lid member 86a and the second lid member 86b is made of a material with high mass. In this embodiment, each of the first lid member 86a and the second lid member 86b is made of a metal plate, similar to the first partition wall 6. That is, in this embodiment, each of the first lid member 86a and the second lid member 86b is screw-fixed to the second partition wall 7. That is, each of the first lid member 86a and the second lid member 86b 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 86a and the through holes H in the second cover member 86b.

[0067] More specifically, the first lid member 86a is set to be larger than the second large opening 70a. This ensures that when the first lid member 86a closes the second large opening 70a, its outer peripheral end overlaps the outside of the second large opening 70a of the second partition wall 7. Accordingly, the outer peripheral end of the first lid member 86a is provided with multiple through holes H... for inserting bolts B, and around the second large opening 70a 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 allows the first lid member 86a to be fixed in a closed state by screwing the bolts B inserted through the through holes H of the first lid member 86a into the threaded holes SH (female threaded members (nuts)) of the second partition wall 7.

[0068] The second lid member 86b is set to be larger than the second small opening 70b. This ensures that when the second lid member 86b closes the second small opening 70b, its outer peripheral end overlaps the outside of the second small opening 70b of the second partition wall 7. Accordingly, the outer peripheral end of the second lid member 86b is provided with multiple through holes H... for inserting bolts B, and around the second small opening 70b 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 allows the second lid member 86b to be fixed in a closed state by screwing the bolts B inserted through the through holes H of the second lid member 86b into the threaded holes SH (female threaded members (nuts)) of the second partition wall 7.

[0069] In this embodiment, the lower end of the first lid member 86a is fixed by a fixing bracket 87. The fixing bracket 87 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 86a. Specifically, the fixing bracket 87 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 87 is inserted. In addition, the lower end (upright portion 800a) of the first partition wall 6 is provided with a screw hole (tapped hole) SH corresponding to the through hole H2 of the second partition wall 7.

[0070] In this embodiment, a cylindrical spacer 88 is positioned between the fixing bracket 87 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 87 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 87. The first cover member 86a is provided with a notch 860a at a position that avoids the fixing bracket 87, for passing wiring or piping through. A grommet (not shown) made of rubber or resin is fitted into the notch 860a to reduce sound leakage.

[0071] The work machine 1 of this embodiment is equipped with sound-absorbing material 65. The sound-absorbing material 65 is located in the prime mover compartment of the first bulkhead 6. It is attached to the surface facing the ER side. In this embodiment, the first partition wall 6 has a first opening 60 (first large opening 60a, first small opening 60b) that corresponds to the second opening 70 (second large opening 70a, second small opening 70b), so sound-absorbing material 66 is also attached to the surface of the lid members 86 (first lid member 86a, second lid member 86b) that close the second opening 70 (second large opening 70a, second small opening 70b) and face the engine room ER side. Note that Figure 17 shows sound-absorbing material 66 applied only to the first lid member 86a of the lid member 86. The sound-absorbing material 66 attached to the lid member 86 is formed in a shape similar to the first opening 60 of the first partition wall 6, and as shown in Figure 18, it fits into the first opening 60, blocking sound from the engine room ER side together with the sound-absorbing material 65 attached to the first partition wall 6.

[0072] 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 engine room ER to the driver's cab DR.

[0073] In the work machine 1 of this embodiment, the second bulkhead 7 is arranged as described above, so that the design surface DS constitutes (forms) the design on the driver's seat S side (inside the driver's cab DR). Furthermore, in the work machine 1 of this embodiment, as shown in Figures 1 and 2, parts 70e, 70e, and 70d 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 70e, 70e, and 70d 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 70e, 70e, and 70d 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 continuous outer edges of the fourth portion 7d and the pair of fifth portions 7e, 7e of the second bulkhead 7, and the continuous outer edges of the fourth portion 7d and 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.

[0074] The work machine 1 of this embodiment is as described above, and since the first bulkhead 6 supported by the support 8 is covered by the hollow second bulkhead 7, a multi-layered partition is placed between the driver's cab DR and the engine room ER. Furthermore, since the first bulkhead 6 placed between the driver's seat S and the engine 5 is made of metal (metal plate) and has a large mass, it reflects sound from the engine 5 side. This ensures quietness on the driver's seat S side.

[0075] 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 (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 S (driver's cab DR) side.

[0076] Furthermore, because the second bulkhead 7 is formed in a hollow shape, a hollow section 72 (air layer) is created within the second bulkhead 7, making it possible to reduce weight while maintaining an aesthetically pleasing design. In other words, when uneven surfaces are formed, the protruding parts become thicker. Therefore, if the design surface DS is constructed with uneven surfaces to enhance the aesthetic appeal, the second bulkhead 7 tends to become heavier. However, the second bulkhead 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 bulkhead 7 is formed in a hollow shape, the hollow section 72 becomes an air layer, improving heat insulation and suppressing the transfer of heat from the prime mover 5 to the driver's seat S.

[0077] 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.

[0078] For example, in the above embodiment, a backhoe was described as an example of the implement 1, but the implement 1 is not limited to a backhoe. The implement 1 may be other construction machinery, agricultural machinery, a UV (utility vehicle), etc. More specifically, the implement 1 may be a tractor, skid steer loader, wheel loader, etc.

[0079] In the above embodiment, the second partition wall 7 was made by blow molding, but it is not limited to this. For example, the second partition wall 7 may be molded by other molding methods such as injection molding. Also, in the above embodiment, the entire second partition wall 7 was molded as one piece, but the second partition wall 7 may be made by combining multiple resin-molded parts.

[0080] In the above embodiment, openings 60 and 70 (first opening 60 and second opening 70) that serve as inspection ports are provided in the first partition wall 6 and the second partition wall 7, but the embodiment is not limited to this. Whether or not to include the openings 60 and 70 (first opening 60 and second opening 70) can be determined as appropriate, taking into consideration aesthetics and workability.

[0081] In the above embodiment, the first partition wall 6 is 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.

[0082] In the above embodiment, the second partition wall 7 was fixed with screws, but the embodiment is not limited to this. For example, the second partition wall 7 may be made positionable and then fixed via a metal fitting (fixed by pressing).

[0083] Furthermore, the support 8 that supports the first partition wall 6 is not limited to the one described in the above embodiment, but may be of a different form (appearance).

[0084] The above embodiments are as described above, and the present invention (preferred embodiments thereof) provides the work machine 1 described in the following items.

[0085] (Item 1) A work machine 1 comprising a prime mover 5, a driver's seat S 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 S, and a second resin partition wall 7 positioned opposite the first partition wall 6.

[0086] According to the work machine 1 of item 1, the first bulkhead 6 positioned between the prime mover 5 and the driver's seat S is made of metal, so the mass of the first bulkhead 6 is large, which contributes to the quietness on the driver's seat S side. Furthermore, according to the work machine 1 of item 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 S, which can further enhance the quietness on the driver's seat S side.

[0087] (Item 2) The first partition wall 6 is made of metal plates and is the work machine 1 described in item 1.

[0088] According to the work machine 1 of item 2, the first bulkhead 6 is made of metal plates, so despite its simple structure, it exhibits effective sound insulation performance.

[0089] (Item 3) The second partition wall 7 is formed in a hollow shape, as described in item 1 or item 2 of the work machine 1.

[0090] According to the work machine 1 of item 3, 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 S side. Furthermore, because there is an air layer inside the second bulkhead 7, the second bulkhead 7 can be made lighter.

[0091] (Item 4) The work machine 1 according to any one of items 1 to 5, comprising a sealing member 85 (85a) interposed between the first partition wall 6 and the second partition wall 7.

[0092] According to the work machine 1 of item 4, the gap G between the first partition wall 6 and the second partition wall 7 is filled by the sealing member 85 (85a), so that sound leakage from the gap G is prevented and the sound insulation (soundproofing) effect is enhanced.

[0093] (Item 5) The work machine 1 according to any one of items 1 to 6, wherein the first bulkhead 6 has a first opening 60 that penetrates from the driver's seat S side to the engine 5 side, and the second bulkhead 7 has a second opening 70 that penetrates from the driver's seat S side to the engine 5 side and is formed in a position that communicates with the first opening 60, and the work machine 1 is provided with a cover member 86 that closes the second opening 70 while overlapping with the surface from the driver's seat S side.

[0094] According to the work device 1 of item 7, access to the engine 5 side from the driver's seat S side is possible through the first opening 60 and the second opening 70, allowing for efficient maintenance. In addition, since the cover member 86 that closes the second opening 70 closes the second opening 70, sound leakage from the first opening 60 and the second opening 70 is prevented, ensuring quietness on the driver's seat S side.

[0095] (Item 6) The structure 412 supports the second partition wall 7, and the screw member 11 fixes the second partition wall 7 to the structure 412. The second partition wall 7 comprises a first wall 71a positioned opposite the first partition wall 6, a second wall 71b positioned opposite the first wall 71a at a distance, a peripheral wall portion 71c connecting the peripheral edge of the first wall 71a and the peripheral edge of the second wall 71b to form a hollow portion 72 between the first wall 71a and the second wall 71b, and the screw member 11. The work machine 1 according to any one of items 1 to 5, having a fixing part 73 fixed to the structure 412 by 1, the fixing part 73 having through holes formed by holes 75, 75 provided in the first wall 71a and the second wall 71b and hole wall portion 76 connecting the peripheral edges of each of the holes 75, 75, and the second partition wall 7 being fixed to the structure 412 by the screw member 11 inserted through the through hole.

[0096] According to the work machine 1 of item 6, since the hole wall portion 76 is interposed between the head of the screw member 11 and the structure 412, the head of the screw member 11 is prevented from tightening and deforming the first wall 71a and the second wall 71b.

[0097] (Item 7) 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 at the periphery of the second partition wall 7, and the fixing portion 73 is provided at the non-facing portion, as described in item 6 of the work machine 1.

[0098] According to the work machine 1 of item 7, the non-opposing portion of the second bulkhead 7 protrudes from the first bulkhead 6, and a fixing portion 73 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.

[0099] (Item 8) The structure 412 supports the first partition wall 6 and the second partition wall 7 in the work machine 1 described in item 6.

[0100] According to the work machine 1 of item 8, the first bulkhead 6 and the second bulkhead 7 are supported by a common structure 412, so they can be made into a single integrated structure.

[0101] (Item 9) A work machine 1 according to any one of items 1 to 8, comprising a body 4 on which the prime mover 5 and the driver's seat S are mounted, wherein a part of the second bulkhead 7 is exposed on the outer surface of the body 4 and forms part of the exterior design of the body 4.

[0102] According to the work machine 1 of item 9, a portion of the second bulkhead 7 is exposed on the outer surface of the aircraft body 4 and forms part of the exterior design of the aircraft body 4, thus enhancing the exterior design without having to prepare separate parts to enhance the design.

[0103] (Item 10) The work machine 1 according to any one of items 1 to 9, wherein at least a portion of the surface of the second bulkhead 7 on the driver's seat S side forms a design surface visible from the driver's seat S.

[0104] According to work equipment 1 of item 10, the design aesthetics of the driver's seat S side (for example, the interior of the driver's cab DR) are enhanced. [Explanation of Symbols]

[0105] 1: Work machine 5: Prime Engine 6: Bulkhead 7: Cover 8:Structure (support) 10: Color 11: Male screw member 11a: Screw part 11b:Head 60: First opening 60a: First large opening 60b: 1st small opening 70: Second opening 70a: 2nd large opening 70b: 2nd small opening 71: Opposing wall section 71a: 1st wall 71b: 2nd wall 71c: Peripheral wall part 72:Hollow part 73:Fixed part 73a: 1st fixed part 73b:Second fixed part 75: Hole 76: Hole wall 85: Sealing material 86: Lid component 86a: First lid member 86b: Second lid member 412: Structure (Step) DS: Design surface S: Driver's seat

Claims

1. The prime mover and A driver's seat positioned at a distance from the aforementioned prime mover, A first metal bulkhead is positioned between the prime mover and the driver's seat, A work machine comprising a second resin partition wall positioned opposite the first partition wall.

2. The work machine according to claim 1, wherein the first partition wall is made of a metal plate.

3. The work machine according to claim 1, wherein the second partition wall is formed in a hollow shape.

4. The work machine according to claim 1, further comprising a sealing member interposed between the first partition wall and the second partition wall.

5. 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 in a position that communicates with the first opening. The work machine according to claim 1, further comprising a lid member that closes the second opening while overlapping the surface from the driver's seat side.

6. The structure supporting the second partition wall, The second partition wall is fixed to the structure by a screw member, The second partition wall comprises a first wall positioned opposite the first partition wall, a second wall positioned opposite the first wall at a distance, 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 includes through holes formed by holes provided in the first wall and the second wall, and hole wall portions connecting the peripheral edges of each hole. The work machine according to claim 1, wherein the second partition wall is fixed to the structure by the screw member inserted through the through hole.

7. The work machine according to claim 6, 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.

8. The work machine according to claim 6, wherein the structure supports the first partition wall and the second partition wall.

9. The aircraft comprises the aforementioned prime mover and the aforementioned driver's cab, The work machine according to claim 1, wherein a part of the second bulkhead is exposed on the outer surface of the machine and forms part of the exterior design of the machine.

10. The work machine according to claim 1, 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.

Images