Construction machinery cabs and work vehicles equipped with construction machinery cabs

Abstract

To improve visibility in the cab of construction machinery and in work vehicles equipped with a cab of construction machinery. [Solution] A cab for a construction machine and a work vehicle equipped with a cab for a construction machine include a floor, a ceiling, and a rear pillar connecting the rear of the floor and the rear of the ceiling, wherein the rear pillar is connected to at least one of the central part of the ceiling in the left-right direction or the central part of the floor in the left-right direction.

Description

Technical Field

[0001] The present disclosure relates to a cab for construction machinery and a work vehicle provided with the cab for construction machinery.

Background Art

[0002] Patent Document 1 discloses a frame structure of a cab provided with a driver's seat in work vehicles such as construction machinery including hydraulic excavators, agricultural machinery including tractors, and other industrial machinery.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] Incidentally, in the work vehicle as described above, an operator performs driving operation of the work vehicle while visually confirming the surroundings such as the front and rear through the front window, side windows, rear window and the like from the driver's cabin of the cab. In a cab where work is performed while visually confirming the outside from the driver's cabin as described above, expansion of the visual field range at the height of the eye point of the operator seated on the driver's seat is desired, and there is room for improvement in terms of visibility.

[0005] On the other hand, in the work vehicle as described above, demands for improving safety for operators are increasing, and in order to ensure the safety of the operator in the unlikely event that the work vehicle overturns or the like, it has been required to equip a cab provided with a driver protective structure called ROPS (Roll-over Protective Structure). Further, ROPS is required to satisfy strength standards and material standards specified by ISO standards and the like.

[0006] This disclosure is made in view of the above circumstances and aims to provide a cab for construction machinery and a work vehicle equipped with a cab for construction machinery that can improve visibility. [Means for solving the problem]

[0007] The cab of the construction machine according to the first embodiment comprises a floor, a ceiling, and a rear pillar connecting the rear of the floor and the rear of the ceiling, wherein the rear pillar is connected to at least one of the central part of the ceiling in the left-right direction and the central part of the floor in the left-right direction.

[0008] The work vehicle according to the second embodiment is equipped with the cab of the construction machine according to the first embodiment. [Effects of the Invention]

[0009] According to this disclosure, visibility can be improved in the cab of a construction machine and in a work vehicle equipped with a cab of a construction machine. [Brief explanation of the drawing]

[0010] [Figure 1] This is a schematic side view showing an example of a work vehicle according to one embodiment of the present disclosure. [Figure 2] Figure 1 is a perspective view of the cab mounted on the work vehicle, seen from the front left. [Figure 3] Figure 1 is a perspective view of the cab mounted on the work vehicle, seen from the right rear. [Figure 4] This is a schematic perspective view showing an example of a cab's skeletal structure. [Figure 5] Figure 4 is a rear view of the skeletal structure, showing the back member as seen from the rear. [Figure 6] This is a front view of the vehicle as seen from inside the driver's cab. [Figure 7] This is a schematic cross-sectional view showing the arrangement of pillars in the driver's cab. [Figure 8] This is an illustrative diagram showing the approach used by work vehicles when handling excavated soil. [Modes for carrying out the invention]

[0011] A work vehicle 10 to which a cab 20 of a construction machine according to one embodiment of the present disclosure is applied will be described below with reference to the drawings. In this specification and the drawings, components having substantially the same functional configuration are denoted by the same reference numerals, and redundant explanations will be omitted. Also, in each figure, the arrow FR indicates the front side in the longitudinal direction of the vehicle, the arrow UP indicates the upper side in the vertical direction of the vehicle, and the arrow LH indicates the left side in the vehicle width direction. In the following description, when the longitudinal, vertical, and left-right directions are used without special specification, they refer to the longitudinal direction of the vehicle, the vertical direction of the vehicle, and the left-right direction in the vehicle width direction, respectively.

[0012] <Work Vehicle 10> Figure 1 is a schematic side view showing an example of a work vehicle according to one embodiment of the present disclosure. As shown in Figure 1, the work vehicle 10 according to this embodiment includes, for example, a front vehicle section 11 including a cab 20, a rear vehicle section 12 including a dump body 30, and a flexible connecting section 13 that flexibly connects the front vehicle section 11 and the rear vehicle section 12.

[0013] The front vehicle section 11 comprises a cab 20, a lateral platform 22 located to the side of the cab 20, and left and right front wheels 24 located below the cab 20. The cab 20 has a driver's compartment 27 inside which a driver's seat 26 (see Figure 5) is located, and is constructed as a box-shaped structure. The cab 20 will be described in detail later.

[0014] The lateral platforms 22 are provided on the right and left sides of the cab 20, respectively. The lateral platforms 22 are equipped with handrails 23 provided on the platforms 22. The handrails 23 are provided at appropriate positions on the outer, front, and rear sides in the vehicle width direction for workers standing on the lateral platforms 22.

[0015] The rear vehicle portion 12 includes a dump body 30, and left and right rear wheels 32, 33 located on the lower side of the dump body 30. The rear wheels 32, 33 include a first rear wheel 32 and a second rear wheel 33 located further to the rear side than the first rear wheel 32.

[0016] The dump body 30 is supported so as to be tiltable relative to the frame 14 of the articulated connection portion 13. The dump body 30 is formed in a box shape with an open upper side. The dump body 30 is provided with a tailgate 34. The tailgate 34 is provided to be able to open and close the rear end of the dump body 30, and has a role of controlling retention and discharge of loaded materials. The tailgate 34 prevents loaded materials in the dump body 30 from falling during travel of the work vehicle 10, and is opened when the dump body 30 is tilted to smoothly discharge the loaded materials.

[0017] <Cab 20> Figure 2 is a perspective view of the cab 20 mounted on the work vehicle 10 of Figure 1, viewed from the diagonally front left side, and Figure 3 is a perspective view of the cab 20 mounted on the work vehicle 10 of Figure 1, viewed from the diagonally rear right side. As shown in Figure 2 and Figure 3, the cab 20 includes a cab main body portion 40, and a skeleton body 50 that forms the skeleton of the cab main body portion 40.

[0018] As shown in Figure 2 and Figure 3, the cab main body portion 40 is formed in a box shape having a front surface 42, a back surface 43, a left side surface 44, a right side surface 45, a floor surface 46, and a ceiling surface 47. In the present embodiment, as an example, the left side surface 44 and the right side surface 45 are inclined by about 2 degrees such that the upper portion is positioned more inward than the lower portion when viewed from the front-rear direction. Each surface of the cab main body portion 40 is supported by the skeleton body 50. In the present embodiment, as an example, the skeleton body 50 is formed of a hollow member (pipe-shaped member), that is, a member having a closed cross-sectional shape. Here, the skeleton body 50 will be described. Figure 4 is a perspective view schematically showing an example of the skeleton body 50. Figure 4 is a perspective view viewed from the diagonally rear right side.

[0019] As shown in FIG. 4, the skeleton body 50 includes a floor beam 52 that supports the floor surface 46. The floor beam 52 includes a pair of floor side beams 52A, a floor rear beam 52B, a floor front beam 52C, a floor oblique beam 52D, a front central floor beam 52E, a rear central floor beam 52F, and a pair of floor longitudinal beams 52G.

[0020] The pair of floor side beams 52A are respectively disposed on both sides in the left-right direction, and extend in the vehicle front-rear direction. In the present embodiment, as an example, of the pair of floor side beams 52A, the left floor side beam 52AL is formed to be longer than the right floor side beam 52AR. The floor rear beam 52B connects the rear ends of the pair of floor side beams 52A in the left-right direction.

[0021] The floor front beam 52C extends in the left-right direction from the front end of the left floor side beam 52AL. The floor oblique beam 52D obliquely connects the right end of the floor front beam 52C and the front end of the right floor side beam 52AR.

[0022] The front central floor beam 52E is disposed at an interval on the rear side of the floor front beam 52C, and connects the pair of floor side beams 52A in the left-right direction. The rear central floor beam 52F is disposed at an interval on the rear side of the front central floor beam 52E, and connects the pair of floor side beams 52A in the left-right direction.

[0023] The pair of floor longitudinal beams 52G are respectively disposed at intervals inward in the left-right direction relative to the pair of floor side beams 52A, and connect the front central floor beam 52E and the rear central floor beam 52F in the vehicle front-rear direction.

[0024] In the present embodiment, the floor 20A is constituted by the floor beam 52 and the floor surface 46. In other words, the floor 20A includes the floor beam 52 and the floor surface 46.

[0025] Furthermore, the skeletal structure 50 includes ceiling beams 53 that support the ceiling surface 47. The ceiling beams 53 comprise a pair of lateral ceiling beams 53A, a rear ceiling beam 53B, a front ceiling beam 53C, and a central ceiling beam 53D. In this embodiment, as an example, the width of the ceiling surface 47 in the vehicle longitudinal direction is formed to be narrower than the width of the floor surface 46 in the vehicle longitudinal direction.

[0026] Specifically, as an example, the rear ceiling beam 53B is positioned to overlap with the rear floor beam 52B in the vehicle's longitudinal direction when viewed from above. The front ceiling beam 53C is positioned between the front floor beam 52C and the center front floor beam 52E in the vehicle's longitudinal direction when viewed from above. In this embodiment, as an example, the front ceiling beam 53C is positioned slightly closer to the center front floor beam 52E than the front floor beam 52C in the vehicle's longitudinal direction. Furthermore, the front ceiling beam 53C is positioned to overlap with the front end of the right side floor beam 52AR in the vehicle's longitudinal direction when viewed from above.

[0027] A pair of ceiling lateral beams 53A are arranged on both sides in the left-right direction and extend in the front-rear direction of the vehicle. The ceiling rear beam 53B connects the rear ends of the pair of ceiling lateral beams 53A in the left-right direction. The ceiling front beam 53C connects the front ends of the pair of ceiling lateral beams 53A in the left-right direction. As described above, the left side 44 and the right side 45 are tilted by about 2 degrees such that the upper part is located inward from the lower part when viewed from the front-rear direction. Therefore, the width of the ceiling surface 47 in the left-right direction is narrower than the width of the floor surface 46 in the left-right direction.

[0028] Specifically, as an example, the widths in the left-right direction of the rear ceiling beam 53B, front ceiling beam 53C, and central ceiling beam 53D that support the ceiling surface 47 are formed to be narrower than the widths in the left-right direction of the rear floor beam 52B, front central floor beam 52E, and rear central floor beam 52F that support the floor surface 46.

[0029] In this embodiment, the ceiling 20B is composed of the ceiling beam 53 and the ceiling surface 47. In other words, the ceiling 20B includes the ceiling beam 53 and the ceiling surface 47.

[0030] Furthermore, the skeletal structure 50 includes side pillars 54 that support the left side 44 and the right side 45. The side pillars 54 consist of a left front pillar 54A and a right front pillar 54B, which are a pair of first pillars. The left front pillar 54A and the right front pillar 54B correspond to the A pillars of the cab 20. The left front pillar 54A and the right front pillar 54B are front pillars that connect the front of the floor 20A and the front of the ceiling 20B, respectively. Here, "front" refers to the part in front of the center in the longitudinal direction of the vehicle.

[0031] The left front pillar 54A connects the left front corner of the ceiling beam 53 and the left floor lateral beam 52AL in the vertical direction. Specifically, the upper end of the left front pillar 54A is connected to both the ceiling lateral beam 53A and the ceiling front beam 53C. The lower end of the left front pillar 54A is connected to the upper surface of the left floor lateral beam 52AL, which is slightly forward of the floor center front beam 52E.

[0032] The right front pillar 54B connects the right front corner of the ceiling beam 53 and the right floor lateral beam 52AR in the vertical direction. Specifically, the upper end of the right front pillar 54B is connected to both the ceiling lateral beam 53A and the ceiling front beam 53C. The lower end of the right front pillar 54B is connected to the upper surface of the left floor lateral beam 52AL, which is slightly forward of the floor center front beam 52E. The lower end of the right front pillar 54B is positioned behind the front ends of the floor inclined beam 52D and the left floor lateral beam 52AL. The pair of left and right first pillars, namely the left front pillar 54A and the right front pillar 54B, are positioned opposite each other in the left-right direction.

[0033] Furthermore, the side pillar 54 includes a left center pillar 54C and a right center pillar 54D, which act as a pair of second pillars. The left center pillar 54C and the right center pillar 54D correspond to the B pillars of the cab 20.

[0034] The left central pillar 54C connects the central part of the ceiling beam 53 in the vehicle's longitudinal direction to the left floor lateral beam 52AL in the vertical direction. Specifically, the upper end of the left central pillar 54C is connected to the lower surface of the ceiling lateral beam 53A at a position corresponding to the ceiling central beam 53D in the vehicle's longitudinal direction. The lower end of the left central pillar 54C is connected to the upper surface of the left floor lateral beam 52AL at a position corresponding to the floor central rear beam 52F in the vehicle's longitudinal direction.

[0035] The right central pillar 54D connects the central part of the ceiling beam 53 in the vehicle's longitudinal direction to the right floor lateral beam 52AR in the vertical direction. Specifically, the upper end of the right central pillar 54D is connected to the lower surface of the ceiling lateral beam 53A at a position corresponding to the ceiling central beam 53D in the vehicle's longitudinal direction. The lower end of the right central pillar 54D is connected to the upper surface of the right floor lateral beam 52AR at a position corresponding to the floor central rear beam 52F in the vehicle's longitudinal direction.

[0036] Furthermore, the side pillars 54 are provided with a pair of rear side pillars 54E on the vehicle rear side of the left center pillar 54C and the right center pillar 54D. The pair of rear side pillars 54E are provided so as to extend upward from the left and right rear corners of the floor beam 52. Specifically, the pair of rear side pillars 54E are erected upward from the upper rear ends of the left floor side beam 52AL and the right floor side beam 52AR, respectively. As an example, the pair of rear side pillars 54E extend below the center in the vertical direction between the floor 46 and the ceiling 47. More specifically, the upper end of the left rear side pillar 54EL of the pair of rear side pillars 54E is formed slightly lower than the upper end of the right rear side pillar 54ER of the pair of rear side pillars 54E.

[0037] Furthermore, the side pillar 54 is equipped with a pair of lateral rear horizontal members 54F above a pair of floor side beams 52A. The pair of lateral rear horizontal members 54F connect the upper ends of the pair of rear side pillars 54E to the left center pillar 54C and the right center pillar 54D in the longitudinal direction of the vehicle. Of the pair of lateral rear horizontal members 54F, the left lateral rear horizontal member 54FL is positioned slightly lower than the right lateral rear horizontal member 54FR of the pair of lateral rear horizontal members 54F.

[0038] Furthermore, the side pillar 54 is equipped with a right-side central horizontal member 54G above the right floor side beam 52AR. The right-side central horizontal member 54G connects the right central pillar 54D and the right front pillar 54B in the longitudinal direction of the vehicle. The right-side central horizontal member 54G is positioned at the same height as the right-side rear horizontal member 54FR of the pair of side rear horizontal members 54F.

[0039] Furthermore, the skeletal structure 50 includes a front pillar 55 that supports the front surface 42. The front pillar 55 comprises a left front end pillar 55A, a left front horizontal member 55B, a right front horizontal member 55C, and a front end horizontal member 55D.

[0040] The left front pillar 55A extends upward from the upper surface of the front end of the left floor lateral beam 52AL. Specifically, the left front pillar 55A is erected from the upper surface of the left floor lateral beam 52AL at a position corresponding to the floor front beam 52C in the vehicle's longitudinal direction. The upper end of the left front pillar 55A extends, for example, to a height equivalent to that of the right central horizontal member 54G.

[0041] The left front horizontal member 55B connects the left front pillar 54A and the upper end of the left front end pillar 55A in the longitudinal direction of the vehicle. As an example, the left front horizontal member 55B is positioned at the same height as the right central horizontal member 54G.

[0042] The right front horizontal member 55C extends from the right front pillar 54B toward the front of the vehicle. For example, the right front horizontal member 55C is positioned at the same height as the right central horizontal member 54G.

[0043] The front horizontal member 55D connects the front end of the left front horizontal member 55B and the front end of the right front horizontal member 55C in the left-right direction. The left end of the front horizontal member 55D is connected to the front end of the left front horizontal member 55B and the upper end of the left front pillar 55A. In a plan view, the front horizontal member 55D is positioned in front of the ceiling surface front beam 53C. The front horizontal member 55D supports the lower end of the front glass 42CF, which will be described later.

[0044] Furthermore, the skeletal structure 50 includes a rear member 57 that supports the rear surface 43. Figure 5 is a rear view of the rear member 57 of the skeletal structure 50 in Figure 4, viewed from the rear. In addition, Figure 5 also shows the rear floor beam 52B that supports the floor surface 46 and the rear ceiling beam 53B that supports the ceiling surface 47.

[0045] As shown in Figure 5, the rear member 57 comprises a pair of rear pillars 57A and an auxiliary beam 57B. The auxiliary beam 57B connects the pair of rear pillars 57A in the left-right direction. In this embodiment, as an example, the auxiliary beam 57B comprises an upper auxiliary beam 57BU and a lower auxiliary beam 57BD. Note that there may be one or two auxiliary beams 57B. The number of auxiliary beams 57B is not limited.

[0046] The rear pillar 57A is located on the rear 43 behind the driver's seat 26 (see Figure 7) and corresponds to the center C-pillar of the cab 20. The rear pillar 57A connects the rear of the floor 20A and the rear of the ceiling 20B. Specifically, the rear pillar 57A connects the rear floor beam 52B and the rear ceiling beam 53B in the vertical direction. In this embodiment, the rear pillar 57A is connected to the central part of the ceiling 20B in the left-right direction and to the central part of the floor 20A in the left-right direction. Specifically, one end (upper end) of the rear pillar 57A is connected to the central part of the ceiling 20B in the left-right direction, and the other end (lower end) is connected to the central part of the floor 20A in the left-right direction.

[0047] In this embodiment, the rear pillar 57A includes, as an example, a left rear pillar 57AL positioned to the left of the center of the rear surface 43, and a right rear pillar 57AR positioned to the right of the center of the rear surface 43, spaced apart from the left rear pillar 57AL. The left rear pillar 57AL and the right rear pillar 57AR are formed from hollow members and are formed in a straight shape. In a rear view, the left rear pillar 57AL and the right rear pillar 57AR move further apart from each other from the upper end to the lower end.

[0048] In other words, the left rear pillar 57AL and the right rear pillar 57AR are arranged to be tilted with respect to the floor 20A. Specifically, they are arranged to be tilted inward with respect to the floor 20A at an angle R1. Here, the angle R1 with respect to the floor 20A, which is the outward angle R1 in the left-right direction, is preferably greater than 90 degrees and 95 degrees or less. In this embodiment, as an example, the left rear pillar 57AL and the right rear pillar 57AR are arranged to be tilted in accordance with the tilt of the left side 44 and the right side 45, which are the sides closest to each other. That is, the angle R1 is 92 degrees. In other words, the left rear pillar 57AL and the right rear pillar 57AR are tilted by about 2 degrees such that, when viewed from the front-rear direction, the upper part is located inward from the lower part.

[0049] The upper auxiliary beam 57BU is positioned between the floor rear beam 52B and the ceiling rear beam 53B, connecting the left rear pillar 57AL and the right rear pillar 57AR in the left-right direction. As an example, the upper auxiliary beam 57BU is positioned above the center in the vertical direction between the floor rear beam 52B and the ceiling rear beam 53B, and is positioned closer to the ceiling surface 47 than the center. Preferably, the upper auxiliary beam 57BU has a vertical width A1 of 60 mm or more and a left-right width A2 of 230 mm or more.

[0050] The lower auxiliary beam 57BD is positioned below the upper auxiliary beam 57BU, spaced apart from it. The lower auxiliary beam 57BD connects the left rear pillar 57AL and the right rear pillar 57AR in the left-right direction. As an example, the lower auxiliary beam 57BD is positioned at the same height as the right rear horizontal member 54FR. Preferably, the lower auxiliary beam 57BD has a vertical width A3 of 60 mm or more and a left-right width A4 of 280 mm or more.

[0051] Furthermore, the width A2 of the upper auxiliary beam 57BU in the left-right direction is preferably formed in a ratio of 0.80 to 0.9, and more preferably in a ratio of 0.82, relative to the width A4 of the lower auxiliary beam 57BD in the left-right direction.

[0052] In this embodiment, as an example, the first distance H1 between the ceiling 20B and the upper auxiliary beam 57BU is shorter than the second distance H2 between the floor 20A and the lower auxiliary beam 57BD. Specifically, it is preferable that the distance H1 is 130 mm or more and the distance H2 is 510 mm or more.

[0053] Furthermore, the third distance H3 between the floor 20A and the upper auxiliary beam 57BU is preferably set at a ratio of 0.8 to 0.9, and more preferably at a ratio of 0.86, with respect to the fourth distance H4 between the floor 20A and the ceiling 20B.

[0054] Furthermore, the second distance H2 between the floor 20A and the lower auxiliary beam 57BD is preferably set at a ratio of 0.3 to 0.4, and more preferably at a ratio of 0.35, with respect to the fourth distance H4 between the floor 20A and the ceiling 20B.

[0055] The rear member 57 includes a first auxiliary member that connects the rear pillar 57A to the floor 20A, and a second auxiliary member that connects the rear pillar 57A to the floor 20A. Specifically, the rear member 57 includes a left auxiliary member 58L as a first auxiliary member that connects the floor 20A to the left rear pillar 57AL, and a right auxiliary member 58R as a second auxiliary member that connects the floor 20A to the right rear pillar 57AR. In other words, the left rear pillar 57AL and the right rear pillar 57AR, i.e., the rear pillars 57, are located between the left auxiliary member 58L and the right auxiliary member 58R in the left-right direction. In this embodiment, the left auxiliary member 58L is located closer to the auxiliary seat 26A (see Figure 7), which will be described later, than the right auxiliary member 58R.

[0056] The left auxiliary member 58L and the right auxiliary member 58R have different shapes. Specifically, the auxiliary member further away from the auxiliary seat 26A (see Figure 7) is formed with a higher strength than the auxiliary member closer to the auxiliary seat 26A. In other words, in this embodiment, the right auxiliary member 58R is formed with a higher strength than the left auxiliary member 58L.

[0057] Specifically, the right auxiliary member 58R is formed to have a larger area in a rear view than the left auxiliary member 58L. In other words, the contact area between the right auxiliary member 58R and the floor 20A is formed to be larger than the contact area between the left auxiliary member 58L and the floor 20A. Furthermore, the contact area between the right auxiliary member 58R and the right rear pillar 57AR is formed to be larger than the contact area between the left auxiliary member 58L and the left rear pillar 57AL.

[0058] Furthermore, in this embodiment, as an example, an upper auxiliary member 59A is provided that connects the upper auxiliary beam 57BU to the left rear pillar 57AL and the right rear pillar 57AR, respectively, and a lower auxiliary member 59B is provided that connects the lower auxiliary beam 57BD to the left rear pillar 57AL and the right rear pillar 57AR, respectively.

[0059] Such a skeletal structure 50 is formed integrally by welding each component at the joint position, for example. The cab 20 is supported on each side, namely the front 42, rear 43, left side 44, right side 45, floor 46, and ceiling 47, by the skeletal structure 50, thereby forming the driver's compartment 27.

[0060] As shown in Figures 2 and 3, the front surface 42 is provided with a front panel 42A. The front panel 42A covers the area enclosed by the floor front beam 52C, the floor inclined beam 52D, the left front pillar 55A, and the front horizontal member 55D, and is fixed to each member. In other words, the front panel 42A is bent at the location corresponding to the floor inclined beam 52D. Specifically, it is bent such that the diagonal line connecting the right end of the floor front beam 52C and the right end of the front horizontal member 55D forms a mountain fold 42AM.

[0061] Furthermore, the front surface 42 is equipped with a front glass panel 42CF. The left side glass panel 44CS and the right side glass panel 45CS, which will be described later, are joined to the left and right ends of the front glass panel 42CF, respectively. In this embodiment, as an example, the front glass panel 42CF is formed in a rectangular shape. The upper end of the front glass panel 42CF is supported by the front ceiling beam 53C, and the lower end is supported by the front end horizontal member 55D, so the lower end is positioned further forward than the upper end. That is, as shown in Figure 2, the front glass panel 42CF is positioned diagonally such that the lower end is located further forward than the upper end.

[0062] The front front glass 42CF and the left and right side glass 44CS and right side glass 45CS are joined at the front left and right ends of the cab 20, so the front left and right ends of the cab 20 form a visible area from which the outside can be seen from inside the cab 20.

[0063] As shown in Figure 2, the left side 44 is provided with a door section 44A. The upper end, lower end, front end, and rear end of the door section 44A are supported by the ceiling side beam 53A, the left floor side beam 52AL, the left front pillar 54A, and the left center pillar 54C, respectively. The door section 44A comprises a door frame 44AF and a door panel 44AD that can be opened and closed around the left center pillar 54C side of the door frame 44AF. The door panel 44AD is provided with a handle 44AT. The door panel 44AD has three window sections 44AG at the top.

[0064] Furthermore, the left side surface 44 is an example of a side wall, and is provided with a left front side panel 44B and a left rear side panel 44C below the left front horizontal member 55B and the left rear horizontal member 54FL, respectively. The left front side panel 44B is rectangular in shape and covers the area enclosed by the left floor side beam 52AL, the left front pillar 54A, the left front end pillar 55A, and the left front horizontal member 55B, and is fixed to each member.

[0065] The left rear side panel 44C is rectangular in shape and covers the area enclosed by the left floor lateral beam 52AL, the left central pillar 54C, the left rear horizontal member 54FL, and the left rear side pillar 54EL, and is fixed to each of these members.

[0066] Furthermore, the left side 44 is equipped with a left side glass 44CS joined to the upper side of the left front horizontal member 55B, extending from the left end of the front glass 42CF toward the rear. The left side glass 44CS is an example of a side glass. The left side glass 44CS is formed in a roughly triangular shape with the end on the front glass 42CF side as the hypotenuse. The rear end of the left side glass 44CS is supported by the left front pillar 54A. The lower end of the left side glass 44CS is supported by the left front horizontal member 55B.

[0067] Furthermore, the left side surface 44 is equipped with a rear left side glass 44G above the left rear horizontal member 54FL. The rear left side glass 44G extends forward from the left end of the left rear glass 43GL, which will be described later. The rear left side glass 44G is rectangular in shape, and its upper end, lower end, front end, and rear end are supported by the ceiling side beam 53A, the left rear horizontal member 54FL, the left central pillar 54C, and the left rear glass 43GL, respectively.

[0068] As shown in Figure 3, the right side surface 45 is an example of a side wall, and is equipped with a right front side panel 45A, a right center side panel 45B, and a right rear side panel 45C below the right front horizontal member 55C, the right central horizontal member 54G, and the right rear horizontal member 54FR, respectively. The right front side panel 45A is substantially triangular in shape and is fixed to the right floor side beam 52AR, the right front pillar 54B, and the right front horizontal member 55C.

[0069] The right central side panel 45B is rectangular in shape and covers the area enclosed by the right floor lateral beam 52AR, the right central pillar 54D, the right central horizontal member 54G, and the right front pillar 54B, and is fixed to each of these members.

[0070] The right rear side panel 45C is rectangular in shape and covers the area enclosed by the right floor lateral beam 52AR, the right central pillar 54D, the right rear horizontal member 54FR, and the right rear side pillar 54ER, and is fixed to each of these members.

[0071] Furthermore, the right side 45 is provided with a right side glass 45CS joined to the upper side of the right front horizontal member 55C from the right end of the front glass 42CF toward the rear. The right side glass 45CS is an example of a side glass. The right side glass 45CS is formed in a roughly triangular shape with the end on the front glass 42CF side as the hypotenuse. The rear end of the right side glass 45CS is supported by the right front pillar 54B. The lower end of the right side glass 45CS is also supported by the right front horizontal member 55C.

[0072] Furthermore, the right side surface 45 is equipped with a rear right side glass 45G above the right rear horizontal member 54FR. The rear right side glass 45G extends forward from the right end of the right rear glass 43GR, which will be described later. The rear right side glass 45G is rectangular in shape, and its upper end, lower end, front end, and rear end are supported by the ceiling side beam 53A, the right rear horizontal member 54FR, the right central pillar 54D, and the right rear glass 43GR, respectively.

[0073] Furthermore, the right side surface 45 is equipped with two front right side glass panels 45GF arranged in the front-to-back direction above the right central horizontal member 54G. Each of the two front right side glass panels 45GF is a vertically elongated rectangle, and its upper end, lower end, front end, and rear end are supported by the ceiling side beam 53A, the right central horizontal member 54G, the right central pillar 54D, and the right front pillar 54B, respectively.

[0074] Here, Figure 6 shows a front view of the rear 43 as seen from inside the driver's cab 27. As shown in Figures 3 and 6, the rear 43 comprises a left rear panel 43A, a right rear panel 43B, and a central rear panel 43C. The left rear panel 43A and the right rear panel 43B are examples of rear panels and are formed from plate-like members. The left rear panel 43A and the right rear panel 43B connect to the side walls, i.e., the left side 44 and the right side 45, and to the rear pillar 57A, respectively. The left rear panel 43A and the right rear panel 43B are formed with lower strength than the rear pillar.

[0075] Specifically, the left rear panel 43A is formed in a roughly rectangular shape and is fixed from the rear to the floor rear beam 52B, the left rear pillar 57AL, and the left rear side pillar 54EL. The right rear panel 43B is formed in a rectangular shape and is fixed from the rear to the floor rear beam 52B, the right rear pillar 57AR, and the right rear side pillar 54ER.

[0076] Here, the upper end of the left rear pillar 54EL is formed slightly lower than the upper end of the right rear pillar 54ER, so the upper end of the left rear panel 43A has a slope that is lower on the left side. As a result, the right rear panel 43B has a larger area when viewed from the front-to-back direction than the left rear panel 43A. Consequently, the strength of the right rear panel 43B is higher than that of the left rear panel 43A.

[0077] Furthermore, the left rear panel 43A and the right rear panel 43B are designed to collapse without reinforcing the panel itself, by minimizing the use of ribs, pipe members, etc. In other words, when a lateral force is applied to the center C pillar, i.e., the rear pillars 57A (left rear pillar 57AL, right rear pillar 57AR), during ROPS testing of the cab 20, the energy is absorbed by collapsing the left rear panel 43A and the right rear panel 43B, causing the rear pillars 57A to tilt.

[0078] Furthermore, the left rear panel 43A and the right rear panel 43B are joined by welding or other means to the components for which wiring and other parts for the wiper and motor are attached, respectively.

[0079] The central rear panel 43C is formed in an elongated shape with an extended vertical dimension. The central rear panel 43C covers the area enclosed by the rear ceiling beam 53B, the rear floor beam 52B, and the pair of rear pillars 57A. The central rear panel 43C is fixed to the rear ceiling beam 53B, the rear floor beam 52B, and the pair of rear pillars 57A.

[0080] Furthermore, the rear panel 43 has the left rear glass 43GL and the right rear glass 43GR attached to the upper sides of the left rear panel 43A and the right rear panel 43B, respectively. The left rear panel 43A and the right rear panel 43B have sufficient strength to support the left rear glass 43GL and the right rear glass 43GR, respectively.

[0081] The left rear glass panel 43GL is formed in a roughly rectangular shape and extends to the right in the left-right direction from the rear end of the rear left side glass panel 44G (see Figure 2) described above. The upper, right, and lower ends of the left rear glass panel 43GL are supported by the rear ceiling beam 53B, the left rear pillar 57AL, and the left rear panel 43A, respectively. In other words, the left rear glass panel 43GL connects the left rear panel 43A, which is a rear panel, to the ceiling 20B.

[0082] The right rear glass panel 43GR is formed in a roughly rectangular shape and extends to the left in the left-right direction from the rear end of the rear right side glass panel 45G described above. The upper, left, and lower ends of the right rear glass panel 43GR are supported by the rear ceiling beam 53B, the right rear pillar 57AR, and the right rear panel 43B, respectively. In other words, the right rear glass panel 43GR connects the rear panel, the right rear panel 43B, to the ceiling 20B.

[0083] Thus, the rear left side glass 44G and the left rear glass 43GL, and the rear right side glass 45G and the right rear glass 43GR are joined at the left and right rear ends of the cab 20, so that the left and right rear ends of the cab 20 are visible areas from which the outside can be seen from inside the cab 20.

[0084] <Pillar arrangement in driver's cab 27> Next, the arrangement of the pillars (left front pillar 54A, right front pillar 54B, left center pillar 54C, right center pillar 54D, and a pair of rear pillars 57A) in the driver's compartment 27 of the cab 20 will be described. Figure 7 is a schematic cross-sectional view showing the arrangement of the pillars in the driver's compartment 27 of the cab 20. Note that Figure 7 is a cross-sectional view taken at the eye level of an operator seated in the driver's seat 26 as an example.

[0085] As shown in Figure 7, a driver's seat 26 is provided in the driver's compartment 27 of the cab 20 where the operator sits. In this embodiment, as an example, the driver's seat 26 is positioned slightly to the right of the center in the left-right direction. An auxiliary seat 26A is provided adjacent to the left side of the driver's seat 26. As described above, in this embodiment, a pair of left and right first pillars (A pillars), a pair of left and right second pillars (B pillars), and a third pillar (C pillar) are provided from front to rear. The pair of left and right first pillars (A pillars) are the left front pillar 54A and the right front pillar 54B. The pair of left and right second pillars (B pillars) are the left center pillar 54C and the right center pillar 54D. The third pillar (C pillar) is the rear pillar 57A, that is, the left rear pillar 57AL and the right rear pillar 57AR. In Figure 7, the areas where each pillar is installed are indicated by shading.

[0086] In this embodiment, the central part of the ceiling 20B is the portion that overlaps with the driver's seat 26 in the left-right direction when viewed from the rear, and the central part of the floor 20A is the portion that overlaps with the driver's seat 26 in the left-right direction when viewed from the rear (see Figure 5). In this embodiment, the ceiling 20B includes lateral portions of the ceiling 20B that are located outside the central part of the ceiling 20B in the left-right direction, and the width of the central part of the ceiling 20B in the left-right direction is narrower than the width of one or the other lateral portion of the ceiling 20B. Specifically, in the ceiling 20B, the width of the driver's seat 26 in the left-right direction when viewed from above is narrower than the width of the left side of the driver's seat 26 (on the auxiliary seat 26A side).

[0087] In Figure 7, the field of view from the eye point EP of an operator (not shown) seated in the driver's seat 26 to each pillar is indicated by a dashed line. In a plan view, the horizontal line in the front-to-back direction passing through the eye point EP, i.e., the line of sight from the eye point EP to the front, is defined as the reference line D0. Here, "operator's eye point EP" refers to the position of the operator's eyes when an operator of standard build is seated in the driver's seat, and may be determined based on a predetermined standard, for example, or it may be statistically determined from the eye positions of multiple operators seated in the driver's seat.

[0088] As shown in Figure 7, the left front pillar 54A is positioned behind the angle αL range from the reference line D0 to the first line D1 in a plan view. The right front pillar 54B is positioned behind the angle αR range from the reference line D0 to the second line D2 in a plan view. The left front pillar 54A is positioned within the angle βL range from the first line D1 to the third line D3 in a plan view. The right front pillar 54B is positioned within the angle βR range from the second line D2 to the fourth line D4 in a plan view.

[0089] In this embodiment, as an example, angle αL is 45 degrees or more and 55 degrees or less, more preferably 52 degrees. Angle αR is 45 degrees or more and 55 degrees or less, more preferably 47 degrees. Also, angle βL is 3 degrees or more and 8 degrees or less, more preferably 4 degrees. Angle βR is 3 degrees or more and 8 degrees or less, more preferably 4 degrees.

[0090] The left central pillar 54C is positioned behind the angle γL range from the third line D3 to the fifth line D5 in a plan view. In other words, the left central pillar 54C is positioned behind the angle σL range from the reference line D0 to the fifth line D5 in a plan view. Also, the right central pillar 54D is positioned behind the angle γR range from the fourth line D4 to the sixth line D6 in a plan view. In other words, the right central pillar 54D is positioned behind the angle σR range from the reference line D0 to the sixth line D6 in a plan view. Furthermore, the left central pillar 54C is positioned within the angle δL range from the fifth line D5 to the seventh line D7 in a plan view. The right central pillar 54D is positioned within the angle δR range from the sixth line D6 to the eighth line D8 in a plan view.

[0091] In this embodiment, as an example, angle γL is 35 degrees or more and 45 degrees or less, more preferably 37 degrees. Angles γR are 35 degrees or more and 45 degrees or less, more preferably 42 degrees. Also, angle σL is 90 degrees or more and 95 degrees or less, more preferably 93 degrees. Angles σR are 90 degrees or more and 95 degrees or less, more preferably 93 degrees. Also, angle δL is 9 degrees or more and 14 degrees or less, more preferably 10 degrees. Angles δR are 9 degrees or more and 14 degrees or less, more preferably 11 degrees.

[0092] The rear pillar 57A is located behind the angle εL range from the 7th line D7 to the 9th line D9 in a plan view, and behind the angle εR range from the 8th line D8 to the 10th line D10. The rear pillar 57A is positioned within the angle ζ range from the 9th line D9 to the 10th line D10 in a plan view. In other words, the rear pillar 57A is positioned within the angle ζ range behind (rear of) the driver's seat 26. In this embodiment, as an example, the angle ζ is 30 degrees or more and 40 degrees or less, and more preferably 34 degrees.

[0093] <Effects and Effects> Next, the effects and advantages of this embodiment will be described.

[0094] Figure 8 is an illustrative diagram of the approach to the waste soil area using the work vehicle 10. As shown in Figure 8, when transporting soil to the waste soil area 100 using the work vehicle 10, the operator first visually confirms the waste soil area 100 from a position where it is viewed diagonally to the right and in front of the operator, as shown in (1).

[0095] Then, as shown in (2), the operator visually confirms the waste disposal site 100 at a position to the right and slightly behind, i.e., the turning point, and then begins approaching the waste disposal site 100 as shown in (3). Then, as shown in (4), the operator stops at a position where soil can be disposed of into the waste disposal site 100 and disposes of the soil.

[0096] Thus, the operator wants to visually confirm the waste soil area 100 at the point indicated in (2). However, if the C-pillar is located at the rear corner of the cab, as in conventional designs, there may be areas that are difficult for the operator to see from the desired angle, indicated by the dashed line, due to the C-pillar.

[0097] In the cab 20 according to this embodiment, as shown in Figure 7, the rear pillars 57A, which serve as the third pillar (center C pillar), namely the left rear pillar 57AL and the right rear pillar 57AR, are located on the rear surface 43 behind the driver's seat 26. That is, the left rear pillar 57AL and the right rear pillar 57AR are offset from the rear corner of the cab body 40 toward the center of the rear surface 43, and are therefore located behind the driver's seat 26, which has a relatively low priority in terms of surrounding visibility. In this way, since the third pillar is not located at the rear corner of the driver's seat 26, the field of view of the rear corner can be secured. In other words, at point (2) in Figure 8, the operator can visually see the waste soil yard 100 diagonally behind. Thus, the cab 20 according to this embodiment can improve visibility to the rear.

[0098] Furthermore, in the cab 20 according to this embodiment, a pair of rear pillars 57A, namely the left rear pillar 57AL and the right rear pillar 57AR, are provided on the rear 43, which increases the strength compared to the case where only one rear pillar is provided. In the cab 20 according to this embodiment, visibility is improved and the operator can be protected in the event that the cab tips over.

[0099] On the other hand, in a cab where the upper auxiliary beam 57BU and lower auxiliary beam 57BD are not provided, there is a slight possibility that the strength may be reduced during ROPS testing due to the distortion of the central rear panel 43C, causing the cross-section of the left rear pillar 57AL and the right rear pillar 57AR, i.e., the entire center C pillar, to collapse or twist. In the cab 20 according to this embodiment, the upper auxiliary beam 57BU and the lower auxiliary beam 57BD are provided between the left rear pillar 57AL and the right rear pillar 57AR. Therefore, the strength of the cab 20 can be made stronger compared to the case where the upper auxiliary beam 57BU and the lower auxiliary beam 57BD are not provided.

[0100] Furthermore, this embodiment includes a pair of rear pillars 57A and an auxiliary beam 57B that connects the pair of rear pillars 57A in the left-right direction. By connecting the pair of rear pillars 57A with the auxiliary beam 57B, the pair of rear pillars 57A can be made into a single unit. This makes it possible to make the shape of each pillar thinner while ensuring strength. As a result, the pillars can be made lighter compared to when the rear pillars 57A are made of a single pillar.

[0101] Furthermore, in this embodiment, the cab 20 is equipped with a left auxiliary member 58L and a right auxiliary member 58R. The left auxiliary member 58L and the right auxiliary member 58R are members that maintain strength when the center C pillar, i.e., the pair of rear pillars 57A, is tilted toward the driver's seat 26, i.e., to the right, or toward the opposite side of the driver's seat 26, i.e., to the left, during a ROPS test. This protects the operator seated in the driver's seat 26 when the cab 20 tips over. In addition, the right auxiliary member 58R, which is closer to the driver's seat 26 (see Figure 7), is formed with higher strength than the left auxiliary member 58L. Therefore, when the center C pillar, i.e., the pair of rear pillars 57A, is tilted toward the driver's seat 26, i.e., to the right, during a ROPS test, the tilt of the left central pillar 54C can be suppressed, protecting the trainer seated in the auxiliary seat 26A. Note that the shape and arrangement of the left auxiliary member 58L and the right auxiliary member 58R in this embodiment are merely examples and are not limited to these. For example, if the strength of the cab 20 can be sufficiently ensured, the arrangement of the left auxiliary member 58L and the right auxiliary member 58R may be reversed.

[0102] Furthermore, this embodiment includes a right rear panel 43B and a left rear panel 43A. In ROPS testing, when a force is applied to the center C-pillar, i.e., the pair of rear pillars 57A, in the direction toward the driver's seat 26, i.e., to the right, the right rear panel 43B located on the right side collapses, causing the center C-pillar, i.e., the rear pillar 57A, to tilt to the right while maintaining its shape. Alternatively, when a force is applied in the direction opposite to the driver's seat 26, i.e., to the left, the left rear panel 43A located on the left side collapses, causing the center C-pillar, i.e., the rear pillar 57A, to tilt to the left while maintaining its shape. This protects the operator seated in the driver's seat 26 in the event that the cab 20 tips over.

[0103] Furthermore, in this embodiment, the first distance H1 between the rear ceiling beam 53B and the upper auxiliary beam 57BU is set to be shorter than the second distance H2 between the rear floor beam 52B and the lower auxiliary beam 57BD. Also, the third distance H3 between the rear floor beam 52B and the upper auxiliary beam 57BU is set at a ratio of 0.85 to 0.87 with respect to the fourth distance H4 between the rear floor beam 52B and the rear ceiling beam 53B. Also, the second distance H2 between the rear floor beam 52B and the lower auxiliary beam 57BD is set at a ratio of 0.34 to 0.36 with respect to the fourth distance H4 between the rear floor beam 52B and the rear ceiling beam 53B. Also, the second distance H2 between the rear floor beam 52B and the lower auxiliary beam 57BD is set at a ratio of 0.34 to 0.36 with respect to the fourth distance H4 between the rear floor beam 52B and the rear ceiling beam 53B. These figures are examples only and are not exhaustive.

[0104] These settings were determined based on the analysis results of a skeletal structure in which the rear ceiling beam 53B and the upper auxiliary beam 57BU were arranged with multiple settings, and the values ​​adopted were those that best preserved the overall cross-section of the center C-pillar without distortion or twisting.

[0105] By setting the positions of the upper auxiliary beam 57BU and the lower auxiliary beam 57BD in this way, the operator seated in the driver's seat 26 can be better protected in the event that the cab 20 overturns or otherwise.

[0106] Furthermore, a work vehicle 10 equipped with the cab 20 according to this embodiment can obtain the effects of the cab 20 described above.

[0107] 〔supplementary explanation〕 In the above embodiment, the work vehicle 10 includes a dump body 30 in its rear vehicle section 12, but this disclosure is not limited thereto. For example, the rear vehicle section 12 does not have to include a dump body 30. In other words, the work vehicle 10 may be a work vehicle other than an articulated dump truck.

[0108] Furthermore, in the above embodiment, the rear pillar 57A is composed of two pillars, the left rear pillar 57AL and the right rear pillar 57AR, but the disclosure is not limited thereto, and it may be composed of a single pillar.

[0109] Furthermore, in the above embodiment, the rear pillar 57A has its upper end connected to the left-right central part of the ceiling 20B and its lower end connected to the left-right central part of the floor 20A, but the disclosure is not limited thereto. For example, the rear pillar only needs to be connected to at least one of the left-right central part of the ceiling 20B and the left-right central part of the floor 20A.

[0110] Although one embodiment of the present disclosure has been described above, the present disclosure is not limited to the above, and it is of course possible to implement it in various other forms without departing from its spirit.

[0111] [Note] <First aspect> The floor and, The ceiling and A rear pillar connecting the rear of the floor and the rear of the ceiling, Equipped with, The rear pillar is connected to at least one of the central part of the ceiling in the left-right direction, or the central part of the floor in the left-right direction. The cab of a construction machine. <Second aspect> In the cab of a construction machine according to the configuration of the first embodiment, The rear pillar has one end connected to the center of the ceiling in the left-right direction, and the other end connected to the center of the floor in the left-right direction. <Third aspect> In the cab of a construction machine having the configuration of the first or second embodiment, Equipped with a driver's seat, The central part of the ceiling is the portion that overlaps with the driver's seat in the left-right direction when viewed from the rear. The central part of the floor is the portion that overlaps with the driver's seat in the front-left-right direction when viewed from the rear. <Fourth aspect> In the cab of a construction machine having any of the configurations of the first to third embodiments, The ceiling comprises a lateral portion of the ceiling located outward in the left-right direction relative to the central portion of the ceiling, The width in the left-right direction of the central part of the ceiling is narrower than the width in the left-right direction of one or the other side of the ceiling. <Fifth aspect> In the cab of a construction machine having any of the configurations of the first to fourth embodiments, Equipped with an auxiliary beam, The rear pillar includes a pair of pillars spaced apart in the left-right direction, The auxiliary beam connects the pair of pillars in the left-right direction. <Sixth aspect> In the cab of a construction machine according to the configuration of the fifth embodiment, The aforementioned auxiliary beam is Upper auxiliary beam and It includes a lower auxiliary beam, The upper auxiliary beam connects the pair of pillars in the left-right direction, The lower auxiliary beam connects the pair of pillars in the left-right direction below the upper auxiliary beam. <Seventh aspect> In a cab of a construction machine having a configuration relating to the sixth aspect, The first distance between the ceiling and the upper auxiliary beam is shorter than the second distance between the floor and the lower auxiliary beam. <Eighth aspect> In a cab of a construction machine having a configuration relating to the sixth or seventh aspect, The third distance between the floor and the upper auxiliary beam is such that the ratio to the fourth distance between the floor and the ceiling is 0.8 or more and 0.9 or less. The second distance between the floor and the lower auxiliary beam is such that its ratio to the fourth distance is 0.3 or more and 0.4 or less. <Ninth aspect> In the cab of a construction machine having any of the configurations of the 6th to 8th aspects, The width of the upper auxiliary beam is such that its ratio to the width of the lower auxiliary beam is 0.8 or more and 0.9 or less. <Tenth aspect> In a cab of a construction machine having any of the configurations from the first to the ninth embodiment, A first auxiliary member that connects the rear pillar and the floor, It comprises a second auxiliary member that connects the rear pillar and the floor, The rear pillar is located between the first auxiliary member and the second auxiliary member in the left-right direction. <11th aspect> In the cab of a construction machine according to the configuration of the 10th embodiment, The second auxiliary member has higher strength than the first auxiliary member. <Twelfth aspect> In the cab of a construction machine according to the 11th embodiment, The contact area between the second auxiliary member and the rear pillar is larger than the contact area between the first auxiliary member and the rear pillar. The contact area between the second auxiliary member and the floor is larger than the contact area between the first auxiliary member and the floor. <The 13th aspect> In the cab of a construction machine having a configuration according to the 11th or 12th embodiment, The driver's seat and, The vehicle comprises an auxiliary seat located on either the left or right side of the driver's seat, The first auxiliary member is located closer to the auxiliary seat than the second auxiliary member. <Aspect 14> In the cab of a construction machine having any of the configurations of the 10th to 13th embodiments, The rear pillar includes a pair of pillars spaced apart in the left-right direction, The first auxiliary member connects one of the pair of pillars to the floor, The second auxiliary member connects the other of the pair of pillars to the floor. <Aspect 15> In a cab of a construction machine having any of the configurations from the 1st to the 14th embodiment, Side walls and, It comprises a rear panel connecting the side wall and the rear pillar, The rear panel is less strong than the rear pillar mentioned above. <Pattern 16> In the cab of a construction machine according to the configuration of the 15th embodiment, The aforementioned rear pillar is a hollow member, The aforementioned rear panel is a plate-shaped member. <Pattern 17> In the cab of a construction machine having a configuration according to the 15th or 16th aspect, The rear panel is connected to the ceiling by a rear glass panel. <Aspect 18> In the cab of a construction machine having any of the configurations from the 1st to the 17th embodiment, The rear pillar includes a pair of pillars spaced apart in the left-right direction, The pair of pillars move further apart from each other as you move from the top to the bottom when viewed from the rear. <Pattern 19> In a cab of a construction machine having any of the configurations from the 1st to the 18th embodiment, The rear pillar includes a pair of pillars spaced apart in the left-right direction, The pair of pillars are It has a linear shape, The angle with respect to the floor, where the outward angle in the left-right direction is greater than 90 degrees and 95 degrees or less. <20th aspect> A work vehicle equipped with a cab of construction machinery in any configuration from the 1st to the 19th embodiment. [Explanation of Symbols]

[0112] 10 Work vehicle, 20 Cab, 20A Floor, 20B Ceiling, 26 Driver's seat, 26A Auxiliary seat, 40 Cab body, 43A Left rear panel (rear panel), 43B Right rear panel (rear panel), 43GL Left rear glass (rear glass), 43GR Right rear glass (rear glass), 44 Left side (side wall), 45 Right side (side wall), 46 Floor, 47 Ceiling, 52B Rear beam of the floor, 53B Rear ceiling beam, 57A Rear pillar, 57AL Left rear pillar (rear pillar), 57AR Left rear pillar (rear pillar), 57B Auxiliary beam, 57BU Upper auxiliary beam, 57BD Lower auxiliary beam, 58L Left auxiliary member (first auxiliary member), 58R Right auxiliary member (second auxiliary member), A1-A4: Width in the horizontal direction, H1-H4: Width in the vertical direction

Claims

1. The floor and, The ceiling and A rear pillar connecting the rear of the floor and the rear of the ceiling, Equipped with, The rear pillar is connected to at least one of the central part of the ceiling in the left-right direction and the central part of the floor in the left-right direction. The cab of a construction machine.

2. The rear pillar has one end connected to the center of the ceiling in the left-right direction, and the other end connected to the center of the floor in the left-right direction. The cab of the construction machine according to claim 1.

3. Equipped with a driver's seat, The central part of the ceiling is the portion that overlaps with the driver's seat in the left-right direction when viewed from the rear. The central part of the floor is the portion that overlaps with the driver's seat in the left-right direction when viewed from the rear. A cab for a construction machine according to claim 1 or claim 2.

4. The ceiling comprises a lateral portion of the ceiling located outward in the left-right direction relative to the central portion of the ceiling, The width in the left-right direction of the central part of the ceiling is narrower than the width in the left-right direction of one or the other side of the ceiling. A cab for a construction machine according to claim 1 or claim 2.

5. Equipped with an auxiliary beam, The rear pillar includes a pair of pillars spaced apart in the left-right direction, The auxiliary beam connects the pair of pillars in the left-right direction. The cab of the construction machine according to claim 1.

6. The aforementioned auxiliary beam is Upper auxiliary beam and It includes a lower auxiliary beam, The upper auxiliary beam connects the pair of pillars in the left-right direction, The lower auxiliary beam connects the pair of pillars in the left-right direction below the upper auxiliary beam. The cab of the construction machine according to claim 5.

7. The first distance between the ceiling and the upper auxiliary beam is shorter than the second distance between the floor and the lower auxiliary beam. The cab of the construction machine according to claim 6.

8. The third distance between the floor and the upper auxiliary beam is such that the ratio to the fourth distance between the floor and the ceiling is 0.8 or more and 0.9 or less. The second distance between the floor and the lower auxiliary beam is such that its ratio to the fourth distance is 0.3 or more and 0.4 or less. The cab of the construction machine according to claim 6.

9. The cab of a construction machine according to claim 6, wherein the width of the upper auxiliary beam is in ratio to the width of the lower auxiliary beam of 0.8 or more and 0.9 or less.

10. A first auxiliary member that connects the rear pillar and the floor, It includes a second auxiliary member that connects the rear pillar and the floor, The rear pillar is located between the first auxiliary member and the second auxiliary member in the left-right direction. The cab of the construction machine according to claim 1.

11. The second auxiliary member has higher strength than the first auxiliary member. The cab of a construction machine according to claim 10.

12. The contact area between the second auxiliary member and the rear pillar is larger than the contact area between the first auxiliary member and the rear pillar. The contact area between the second auxiliary member and the floor is larger than the contact area between the first auxiliary member and the floor. The cab of a construction machine according to claim 11.

13. The driver's seat and, The vehicle comprises an auxiliary seat located on either the left or right side of the driver's seat, The first auxiliary member is located closer to the auxiliary seat than the second auxiliary member. The cab of a construction machine according to claim 11.

14. The rear pillar includes a pair of pillars spaced apart in the left-right direction, The first auxiliary member connects one of the pair of pillars to the floor, The second auxiliary member connects the other of the pair of pillars to the floor. A cab for a construction machine according to any one of claims 10 to 13.

15. Side walls and, It comprises a rear panel connecting the side wall and the rear pillar, The rear panel has lower strength than the rear pillar mentioned above. The cab of the construction machine according to claim 1.

16. The aforementioned rear pillar is a hollow member, The aforementioned rear panel is a plate-shaped member. The cab of a construction machine according to claim 15.

17. The rear panel and the ceiling are connected by a rear glass panel. The cab of a construction machine according to claim 16.

18. The rear pillar includes a pair of pillars spaced apart in the left-right direction, The pair of pillars move further apart from each other as you move from the top to the bottom when viewed from the rear. The cab of the construction machine according to claim 1.

19. The rear pillar includes a pair of pillars spaced apart in the left-right direction, The pair of pillars are It has a linear shape, The angle with respect to the floor, where the outward angle in the left-right direction is greater than 90 degrees and less than or equal to 95 degrees. The cab of the construction machine according to claim 1.

20. A construction machine work vehicle equipped with the cab of the construction machine described in claim 1.

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