Construction machinery cabs and work vehicles equipped with construction machinery cabs

Abstract

The objective is 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, a front panel, a front glass connecting the front panel and the ceiling, a first pillar connecting the front of the floor and the front of the ceiling, a third pillar connecting the rear of the floor and the rear of the ceiling, and a side glass connecting the front glass and the first pillar.

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 for 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

Problem to be Solved by the Invention

[0004] Incidentally, in the work vehicles as described above, an operator operates the work implement while visually checking the surroundings such as the front and rear through the front window, side windows, rear window, and the like from inside the driver's cabin of the cab. For cabs where work is performed while visually checking the outside from inside the driver's cabin as such, it is desired to expand the visual field range at the eye point height of the operator seated in the driver's seat, and there is room for improvement in terms of visibility.

[0005] The present disclosure has been made in view of the above circumstances, and an object thereof is to obtain a cab for construction machinery and a work vehicle provided with the cab for construction machinery that can improve visibility.

Means for Solving the Problem

[0006] The cab of the construction machine according to the first embodiment comprises a floor, a ceiling, a front panel, a front glass connecting the front panel and the ceiling, a first pillar connecting the front of the floor and the front of the ceiling, a third pillar connecting the rear of the floor and the rear of the ceiling, and a side glass connecting the front glass and the first pillar.

[0007] The work vehicle of the construction machine according to the second embodiment is equipped with the cab of the construction machine according to the first embodiment. [Effects of the Invention]

[0008] 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]

[0009] [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] This is a schematic cross-sectional view showing the arrangement of pillars in the driver's cab. [Figure 6] Figure 4 is a schematic cross-sectional view showing the cross-section of the right anterior pillar in the skeletal structure. [Figure 7] Figure 4 is a schematic cross-sectional view showing the left anterior pillar of the skeletal structure. [Modes for carrying out the invention]

[0010] 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.

[0011] <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.

[0012] 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.

[0013] 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.

[0014] The rear vehicle section 12 comprises a dump body 30 and left and right rear wheels 32, 33 located below the dump body 30. The rear wheels 32, 33 include a first rear wheel 32 and a second rear wheel 33 located behind the first rear wheel 32.

[0015] The dump body 30 is supported so as to be tiltable relative to the frame 14 of the articulated coupling portion 13. The dump body 30 is formed in a box shape with an open top. The dump body 30 includes a tailgate 34. The tailgate 34 is provided to be capable of opening and closing the rear end of the dump body 30, and has a role of controlling retention and discharge of loaded materials. The tailgate 34 prevents the loaded materials in the dump body 30 from falling when the work vehicle 10 travels, and is opened to smoothly discharge the loaded materials when the dump body 30 is tilted.

[0016] <Cab 20> FIG. 2 is a perspective view of the cab 20 mounted on the work vehicle 10 of FIG. 1 as viewed from the diagonally forward left, and FIG. 3 is a perspective view of the cab 20 mounted on the work vehicle 10 of FIG. 1 as viewed from the diagonally rearward right. As shown in FIG. 2 and FIG. 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.

[0017] As shown in FIG. 2 and FIG. 3, the cab main body portion 40 is formed in a box shape including 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. 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. FIG. 4 is a perspective view schematically showing an example of the skeleton body 50. FIG. 4 is a perspective view as viewed from the diagonally rearward right.

[0018] 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 floor center front beam 52E, a floor center rear beam 52F, and a pair of floor front-rear beams 52G.

[0019] A 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 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.

[0020] 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.

[0021] The front floor center beam 52E is disposed rearward of the floor front beam 52C at an interval, and connects the pair of floor side beams 52A in the left-right direction. The rear floor center beam 52F is disposed rearward of the front floor center beam 52E at an interval, and connects the pair of floor side beams 52A in the left-right direction.

[0022] A pair of floor front-rear beams 52G are respectively disposed inward in the left-right direction at intervals from the pair of floor side beams 52A, and connect the front floor center beam 52E and the rear floor center beam 52F in the vehicle front-rear direction.

[0023] In the present embodiment, the floor 20A is configured 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.

[0024] Moreover, the skeleton body 50 includes a ceiling surface beam 53 that supports the ceiling surface 47. The ceiling surface beam 53 includes a pair of ceiling surface side beams 53A, a ceiling surface rear beam 53B, a ceiling surface front beam 53C, and a ceiling surface center beam 53D. In the present embodiment, as an example, the width of the ceiling surface 47 in the vehicle front-rear direction is formed to be narrower than the width of the floor surface 46 in the vehicle front-rear direction.

[0025] 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.

[0026] 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.

[0027] 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.

[0028] Furthermore, the skeletal structure 50 includes side pillars 54 that support the left side 44 and the right side 45. The side pillars 54 include a first pillar, which comprises a pair of left front pillars 54A and right front pillars 54B. The left front pillars 54A and right front pillars 54B correspond to the A pillars of the cab 20. The left front pillars 54A and right front pillars 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 of the cab body 40 that is in front of the center in the longitudinal direction of the vehicle.

[0029] 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.

[0030] 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 right floor lateral beam 52AR, 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 right floor lateral beam 52AR. 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.

[0031] Furthermore, the side pillar 54 includes a second pillar, which comprises a pair of left-side pillars 54C and right-side pillars 54D spaced apart in the left-right direction. The left-side pillar 54C and right-side pillars 54D correspond to the B-pillars of the cab 20.

[0032] The left-side pillar 54C connects the floor 20A and the ceiling 20B, and is located between the left front pillar 54A and the left rear pillar 57AL, which will be described later. Specifically, the left-side pillar 54C connects the central part of the ceiling beam 53 in the vehicle's longitudinal direction to the left floor beam 52AL in the vertical direction. More specifically, the upper end of the left-side pillar 54C is connected to the lower surface of the ceiling beam 53A at a position corresponding to the central ceiling beam 53D in the vehicle's longitudinal direction. The lower end of the left-side pillar 54C is connected to the upper surface of the left floor beam 52AL at a position corresponding to the central rear floor beam 52F in the vehicle's longitudinal direction.

[0033] The right-side pillar 54D connects the floor 20A and the ceiling 20B, and is located between the right front pillar 54B and the right rear pillar 57AR, which will be described later. Specifically, the right-side pillar 54D connects the central part of the ceiling beam 53 in the vehicle's longitudinal direction to the right floor side beam 52AR in the vertical direction. More specifically, the upper end of the right-side pillar 54D is connected to the lower surface of the ceiling side beam 53A at a position corresponding to the central ceiling beam 53D in the vehicle's longitudinal direction. The lower end of the right-side pillar 54D is connected to the upper surface of the right floor side beam 52AR at a position corresponding to the central rear floor beam 52F in the vehicle's longitudinal direction.

[0034] Furthermore, the side pillars 54 are provided with a pair of rear side pillars 54E on the vehicle rear side of the left side pillar 54C and the right side 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.

[0035] 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 a pair of rear side pillars 54E to the left side pillar 54C and the right side pillar 54D, respectively, in the longitudinal direction of the vehicle. Of the pair of lateral rear horizontal members 54F, the left rear horizontal member 54FL is positioned slightly lower than the right rear horizontal member 54FR of the pair of lateral rear horizontal members 54F.

[0036] 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-side 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.

[0037] 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.

[0038] 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.

[0039] 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.

[0040] 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.

[0041] 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.

[0042] Furthermore, the skeletal structure 50 includes a rear member 57 that supports the rear surface 43. The rear member 57 includes a third pillar, which is comprised of a rear pillar 57A. The rear member 57 also includes an upper auxiliary beam 57B and a lower auxiliary beam 57C.

[0043] The rear pillar 57A is located on the rear 43 behind the driver's seat 26 (see Figure 5) 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.

[0044] 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.

[0045] The upper auxiliary beam 57B 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 57B 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.

[0046] The lower auxiliary beam 57C is positioned below the upper auxiliary beam 57B, spaced apart from it. The lower auxiliary beam 57C connects the left rear pillar 57AL and the right rear pillar 57AR in the left-right direction. As an example, the lower auxiliary beam 57C is positioned at the same height as the right rear horizontal member 54FR.

[0047] 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.

[0048] 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. The front panel 42A is fixed to the floor front beam 52C, the floor inclined beam 52D, the left front pillar 55A, and the front horizontal member 55D. 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.

[0049] 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 front glass panel 42CF connects the front panel 42A and the ceiling 20B. Specifically, 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 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.

[0050] 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.

[0051] 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 side 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 side pillar 54C 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 its top.

[0052] Furthermore, the left side surface 44 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 lateral beam 52AL, the left front pillar 54A, the left front end pillar 55A, and the left front horizontal member 55B. The left front side panel 44B is fixed to the left floor lateral beam 52AL, the left front pillar 54A, the left front end pillar 55A, and the left front horizontal member 55B. The left front side panel 44B corresponds to a side panel and connects the left side glass 44CS (described later) to the floor 20A.

[0053] The left rear side panel 44C is rectangular in shape and covers the area enclosed by the left floor lateral beam 52AL, the left lateral pillar 54C, the left lateral rear horizontal member 54FL, and the left rear side pillar 54EL. The left rear side panel 44C is fixed to the left floor lateral beam 52AL, the left lateral pillar 54C, the left lateral rear horizontal member 54FL, and the left rear side pillar 54EL.

[0054] 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 and connects the front glass 42CF and the left front pillar 54A. 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.

[0055] 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 pillar 54C, and the left rear glass 43GL, respectively.

[0056] As shown in Figure 3, the right side surface 45 is provided 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 roughly 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. The right front side panel 45A corresponds to a side panel and connects the right side glass 45CS (described later) to the floor 20A.

[0057] The right central side panel 45B is rectangular in shape and covers the area enclosed by the right floor lateral beam 52AR, the right side pillar 54D, the right central horizontal member 54G, and the right front pillar 54B. The right central side panel 45B is fixed to the right floor lateral beam 52AR, the right side pillar 54D, the right central horizontal member 54G, and the right front pillar 54B.

[0058] The right rear side panel 45C is rectangular in shape and covers the area enclosed by the right floor lateral beam 52AR, the right side pillar 54D, the right side rear horizontal member 54FR, and the right rear side pillar 54ER. The right rear side panel 45C is fixed to the right floor lateral beam 52AR, the right side pillar 54D, the right side rear horizontal member 54FR, and the right rear side pillar 54ER.

[0059] Furthermore, the right side 45 is equipped with a right side glass 45CS joined to the upper side of the right front horizontal member 55C, extending from the right end of the front glass 42CF toward the rear. The right side glass 45CS is an example of a side glass and connects the front glass 42CF and the right front pillar 54B. 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 supported by the right front horizontal member 55C.

[0060] 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 pillar 54D, and the right rear glass 43GR, respectively.

[0061] 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 pillar 54D, and the right front pillar 54B, respectively.

[0062] As shown in Figure 3, the rear section 43 comprises a left rear panel 43A, a right rear panel 43B, and a central rear panel 43C. The left rear panel 43A is formed in a substantially rectangular shape and is fixed to the floor rear beam 52B, the left rear pillar 57AL, and the left rear side pillar 54EL.

[0063] The right rear panel 43B is rectangular in shape and is fixed to the floor rear beam 52B, the right rear pillar 57AR, and the right rear side pillar 54ER. Here, the upper end of the left rear side pillar 54EL is formed slightly lower than the upper end of the right rear side pillar 54ER, so the upper end of the left rear panel 43A has a slope that is lower on the left side.

[0064] 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.

[0065] 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.

[0066] 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.

[0067] The right rear glass panel 43GR is formed in a roughly rectangular shape and extends to the left in the leftward 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.

[0068] 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.

[0069] <Pillar arrangement in driver's cab 27> Next, the arrangement of pillars (left front pillar 54A, right front pillar 54B, left side pillar 54C, right side pillar 54D, and a pair of rear pillars 57A) in the driver's compartment 27 of the cab 20 will be described. Figure 5 is a schematic cross-sectional view showing the arrangement of pillars in the driver's compartment 27 of the cab 20. Note that Figure 5 is a cross-sectional view taken at the eye level of an operator seated in the driver's seat 26 as an example.

[0070] As shown in Figure 5, 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 side pillar 54C and the right side 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 5, the areas where each pillar is installed are indicated by shading.

[0071] 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. 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).

[0072] In Figure 5, 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-rear 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.

[0073] As shown in Figure 5, 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. Furthermore, 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.

[0074] 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.

[0075] The left lateral 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 lateral 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 lateral 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 lateral 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 lateral 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 lateral pillar 54D is positioned within the angle δR range from the sixth line D6 to the eighth line D8 in a plan view.

[0076] 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.

[0077] 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.

[0078] In this embodiment, as an example, the left front pillar 54A and the right front pillar 54B, which are a pair of left and right first pillars (A pillars), are formed from pipe-shaped members with an irregular cross-section. Figure 6 is a schematic plan view showing the cross-section of the right front pillar 54B, and Figure 7 is a schematic plan view showing the cross-section of the left front pillar 54A.

[0079] As shown in Figure 6, the right front pillar 54B has a closed cross-sectional shape. For example, the right front pillar 54B has a slanted side 54B1, a recess 54B2 that is concave relative to the slanted side 54B1, and protrusions 54B3 on both sides of the recess 54B2 that are convex relative to the slanted side 54B1. In this embodiment, the slanted side 54B1 of the right front pillar 54B is located on the front side and extends along the second line D2, which is the line of sight from the eye point EP. In other words, the right front pillar 54B is arranged such that the slanted side 54B1 extends along the second line D2. In this embodiment, the second line D2 corresponds to the first straight line.

[0080] Furthermore, the right front pillar 54B has a width H in the direction perpendicular to the slanted edge 54B1 in a plan view that is narrower than the operator's standard interpupillary distance. The width H is the widest width within the direction perpendicular to the slanted edge 54B1. In this embodiment, the width H is the width between the slanted edge 54B1 and the rearward protrusion 54B3. That is, the width H is set to fall within the range of the angle βR in Figure 5.

[0081] As shown in Figure 7, the left front pillar 54A has a closed cross-sectional shape, and as an example, it has the same shape as the right front pillar 54B described above. That is, the left front pillar 54A has a slanted side portion 54A1, a recess 54A2, and two protrusions 54A3. The slanted side portion 54A1 of the left front pillar 54A is located on the front side and extends along the first line D1, which is the line of sight from the eye point EP. In other words, the left front pillar 54A is arranged such that the slanted side portion 54A1 extends along the first line D1. In this embodiment, the first line D1 corresponds to a second straight line.

[0082] In other words, in a plan view, the angle α between the first line (second line D2) and the second line (first line D1) is between 90 degrees and 110 degrees. Also, the left front pillar 54A and the left front pillar 54B are, in a plan view, included in the regions of angles βL and βR, which are angles around the intersection point of the first line (second line D2) and the second line (first line D1) (corresponding to the eye point EP in this embodiment). The rear pillar 57A is included in the region of angle ζ, which is the angle around the intersection point of the first line (second line D2) and the second line (first line D1) (corresponding to the eye point EP in this embodiment) in a plan view. Furthermore, the left side pillar 54C and the right side pillar 54D are located behind the intersection point of the first line (second line D2) and the second line (first line D1) (corresponding to the eye point EP in this embodiment) in a plan view.

[0083] In this embodiment, as an example, the left front pillar 54A and the right front pillar 54B are arranged in a symmetrical orientation with respect to the front-rear direction. As shown in Figure 7, the left front pillar 54A is arranged such that the open side of the recess 54A2 faces the left rear (outer) side in the left-right direction. The recess 54A2 is a concave shape that matches the shape of the door frame 44AF of the door section 44A. Specifically, the recess 54A2 is formed in a roughly rectangular shape, similar to the right corner of the front side of the door frame 44AF, and is arranged so as not to interfere with the door frame 44AF. In addition, the width H of the left front pillar 54A is set to fall within the range of the angle βL in Figure 5.

[0084] <Effects and Effects> Next, the effects and advantages of this embodiment will be described.

[0085] In the cab 20 according to this embodiment, as shown in Figure 5, the left side glass 44CS and the right side glass 45CS are joined to the left and right ends of the front glass 42CF, which is disposed on the front surface 42 of the cab body 40, respectively. Therefore, the left front pillar 54A and the right front pillar 54B, which form the frame of the cab body 40 and are a pair of left and right first pillars (A pillars) disposed on the left and right sides in front of the driver's seat 26, are disposed between the left side glass 44CS and the right side glass 45CS and the driver's seat 26, respectively.

[0086] In other words, since the left front pillar 54A and the right front pillar 54B are offset to the rearward side from the front corner of the cab body 40, the forward field of view, i.e., angle α (angle αL + angle αR), can be made wider compared to when there is no rearward offset.

[0087] Furthermore, the left-side pillar 54C and the right-side pillar 54D, which form a pair of second pillars (B-pillars), are positioned behind the left-front pillar 54A and the right-front pillar 54B, respectively, and behind the eye point EP (the intersection of the first and second lines). In addition, the pair of second pillars (B-pillars) are positioned at an angle of 90 degrees or more from the line of sight (reference line D0) straight ahead from the eye point EP (the intersection of the first and second lines). This allows for the widest possible forward field of view, i.e., angle α (angle σL + angle σR), while maintaining the strength necessary to protect the operator in the event of a fall or tipping over of the cab 20.

[0088] Furthermore, the rear pillars 57A, which function as the third pillar (center C-pillar), namely the left rear pillar 57AL and the right rear pillar 57AR, are positioned 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 positioned 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 positioned at the rear corner of the driver's seat 26, the field of view at the rear corner can be secured. Thus, visibility can be improved in the cab 20 according to this embodiment.

[0089] Furthermore, in the cab 20 according to this embodiment, the left front pillar 54A and the right front pillar 54B, which are a pair of left and right first pillars (A pillars), are made of pipe-shaped members. In a closed cross-sectional view, the left front pillar 54A and the right front pillar 54B have slanted edges 54A1 and 54B1 on the front end side of the cab body portion 40 of the pipe-shaped member that extend along the line of sight (first line D1 (second straight line), second line D2 (first straight line)) from the eye point EP of the operator seated in the driver's seat 26.

[0090] Therefore, the obstruction of the operator's line of sight by the left front pillar 54A and the right front pillar 54B in front of the operator's eye point EP when seated in the driver's seat 26 can be suppressed. This improves visibility to the left and right front. In addition, by providing the slanted sections 54A1 and 54B1, the width of the left front pillar 54A and the right front pillar 54B can be made to appear narrower to the operator seated in the driver's seat 26, thereby promoting an expansion of the operator's field of vision.

[0091] Furthermore, in the cab 20 according to this embodiment, the left front pillar 54A has a recess 54A2 on the side corresponding to the slanted edge 54A1 that matches the shape of the door frame 44AF. Therefore, this recess 54A2 can suppress interference between the left front pillar 54A and the door frame 44AF. As a result, while maintaining the strength necessary to protect the operator in the event of a fall or tipping over of the cab 20, the left front pillar 54A can be offset to the rearward side to a position closer to the door frame 44AF, thereby widening the forward field of view (angle αL).

[0092] Furthermore, in the cab 20 according to this embodiment, the width H in the direction substantially perpendicular to the slanted edges 54A1 and 54B1 of the left front pillar 54A and the right front pillar 54B is set to be narrower than the standard interpupillary distance of the operator. As a result, the back (outer) portions of the left front pillar 54A and the right front pillar 54B can be made more visible, thereby improving the blind spots of the left front pillar 54A and the right front pillar 54B.

[0093] Furthermore, a work vehicle 10 equipped with the cab 20 according to this embodiment can obtain the effects of the cab 20 described above.

[0094] 〔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.

[0095] Furthermore, in the above embodiment, a pair of left and right rear pillars 57A, namely the left rear pillar 57AL and the right rear pillar 57AR, are used as the third pillar, but the disclosure is not limited thereto. A single rear pillar 57A may be used as long as it can maintain sufficient strength to protect the operator in the event that the cab 20 falls or tips over.

[0096] Furthermore, in the above embodiment, the left front pillar 54A and the right front pillar 54B have the same shape, but this disclosure is not limited thereto. For example, a recess may be provided only on the side where the door frame 44AF is located. However, from the viewpoint of productivity, it is preferable that the left front pillar 54A and the right front pillar 54B have the same shape.

[0097] 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.

[0098] 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.

[0099] [Note] <First aspect> The floor and, The ceiling and Front panel and A front glass panel connecting the aforementioned front panel and the aforementioned ceiling, A first pillar connecting the front part of the floor and the front part of the ceiling, A third pillar connecting the rear of the floor and the rear of the ceiling, A side glass connecting the front glass and the first pillar, A cab for construction machinery equipped with this feature. <Second aspect> In the cab of a construction machine according to the configuration of the first embodiment, The system includes a side panel that connects the side glass and the floor, The side panel is connected to the first pillar. <Third aspect> In the cab of a construction machine having the configuration of the first or second embodiment, The third 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. <Fourth aspect> In the cab of a construction machine having any of the configurations of the first to third embodiments, The third 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. <Fifth aspect> In the cab of a construction machine having any of the configurations of the first to fourth embodiments, 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. <Sixth aspect> In the cab of a construction machine having any of the configurations of the first to fifth 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. <Seventh aspect> In a cab of a construction machine having any of the configurations of the first to sixth embodiments, The first pillar includes a pair of front pillars spaced apart in the left-right direction. Each of the pair of front pillars has a slanted side facing forward, and the angle between a first straight line along the slanted side of one of the pair of front pillars and a second straight line along the slanted side of the other of the pair of front pillars is 90 degrees or more and 110 degrees or less. <Eighth aspect> In the cab of a construction machine according to the seventh embodiment, The aforementioned front pillar is located in a region where, in a plan view, the angle around the intersection of the first line and the second line is between 3 and 8 degrees. <Ninth aspect> In the cab of a construction machine having a configuration according to the 7th or 8th aspect, The third pillar is located in a region where, in a plan view, the angle around the intersection of the first line and the second line is between 30 and 40 degrees. <Tenth aspect> In the cab of a construction machine having any of the configurations of the 7th to 9th aspects, It comprises a second pillar located between the first pillar and the third pillar, and connecting the floor and the ceiling. The second pillar includes a pair of lateral pillars spaced apart in the left-right direction, The aforementioned lateral pillar is located behind the intersection of the first straight line and the second straight line in a plan view. <11th aspect> In the cab of a construction machine having any of the configurations of the 7th to 10th embodiments, The aforementioned front pillar has a recess on the side facing the slanted edge when viewed from above. <Twelfth aspect> In the cab of a construction machine having any of the configurations of the 7th to 11th aspects, The front pillar has a recess that is concave relative to the slanted side, and on both sides of the recess there are protrusions that are convex relative to the slanted side. <The 13th aspect> In the cab of a construction machine having any of the configurations of the 7th to 12th aspects, The front pillar is set so that, in a plan view, the width in the direction perpendicular to the slanted edge is narrower than the operator's standard interpupillary distance. <Aspect 14> A construction machine work vehicle equipped with a cab of a construction machine having one of the configurations of the 1st to 13th embodiments. [Explanation of symbols]

[0100] 10 Construction machinery work vehicle, 20 Construction machinery cab, 20A Floor, 20B Ceiling, 26 Driver's seat, 40 Cab body, 42A Front panel, 42CF Front window, 44B Left front side panel (side panel), 44CS Left side glass (side glass), 45A Right front side panel (side panel), 45CS Right side glass (side glass) 50 Skeleton (skeleton), 54A Left front pillar (first pillar), 54A1 Hypotenuse, 54A2 recess, 54A3 protrusion, 54B right front pillar (first pillar), 54B1 Hypotenuse, 54B2 Recess, 54B3 Convex, 5 4C Left side pillar (2nd pillar), 54D Right side pillar (2nd pillar), 57A Rear pillar (3rd pillar), 57AL Left rear pillar (3rd pillar) 57AR Left rear pillar (3rd pillar), H width

Claims

1. The floor and, The ceiling and Front panel and A front glass panel connecting the aforementioned front panel and the aforementioned ceiling, A first pillar connecting the front part of the floor and the front part of the ceiling, A third pillar connecting the rear of the floor and the rear of the ceiling, A side glass connecting the front glass and the first pillar, A cab for construction machinery equipped with this feature.

2. The system includes a side panel that connects the side glass and the floor, The side panel is connected to the first pillar. The cab of the construction machine according to claim 1.

3. The third 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 the construction machine according to claim 1.

4. The third 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.

5. 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 3 or claim 4.

6. 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 3 or 4.

7. The first pillar includes a pair of front pillars spaced apart in the left-right direction, Each of the pair of front pillars has a slanted side facing forward, and the angle between a first straight line along the slanted side of one of the pair of front pillars and a second straight line along the slanted side of the other of the pair of front pillars is 90 degrees or more and 110 degrees or less. The cab of the construction machine according to claim 1.

8. The aforementioned front pillar is located in a region where, in a plan view, the angle around the intersection of the first line and the second line is between 3 and 8 degrees. The cab of the construction machine according to claim 7.

9. The third pillar is located in a region where, in a plan view, the angle around the intersection of the first line and the second line is between 30 and 40 degrees. The cab of the construction machine according to claim 7.

10. It comprises a second pillar located between the first pillar and the third pillar, and connecting the floor and the ceiling. The second pillar includes a pair of lateral pillars spaced apart in the left-right direction. The aforementioned lateral pillar is located behind the intersection of the first and second lines in a plan view. The cab of the construction machine according to claim 7.

11. The aforementioned front pillar has a recess on the side facing the slanted edge in a plan view. The cab of the construction machine according to claim 7.

12. The front pillar has a recess that is concave relative to the slanted side, and on both sides of the recess there are protrusions that are convex relative to the slanted side. The cab of the construction machine according to claim 7.

13. The front pillar is set so that, in a plan view, the width in the direction perpendicular to the slanted edge is narrower than the operator's standard interpupillary distance. The cab of the construction machine according to claim 7.

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

Images