Construction machine

Abstract

The load transmission member (60) of the construction machine (10) of the present application has an upper column portion (64), an intermediate portion (62) extending from a position above a lower corner portion (C1) of a window frame of a window (53) and outside a wall width direction (W1) to a position below the lower corner portion (C1) and inside the wall width direction (W1) in such a manner as to avoid the window (53), and a beam portion (65) extending below the window (53) in such a manner as to be away from a wall portion side edge (E1). The upper column portion, the intermediate portion, and the beam portion are continuous in this order so as to be able to transmit a load (F) applied to an upper portion of a cab (30) to an upper frame, and at least the intermediate portion of the load transmission member is formed by a single member. Thus, even in the case where a load is applied to the upper portion of the cab, it is possible to suppress a fracture at a portion near the lower corner portion of the window frame of the window, that is, a corner portion near portion, and thus to suppress a decrease in rigidity of the cab.

Description

Technical Field

[0001] This invention relates to engineering machinery. Background Technology

[0002] A hydraulic excavator, as an example of construction machinery, includes: a lower traveling body; an upper frame rotatably supported by the lower traveling body; a working device including a boom that is supported by the upper frame; and a cab, consisting of a box-like structure with internal space, and supported by the upper frame on the sides of the boom. The cab has multiple walls that surround the front, rear, left, and right sides of the internal space. These walls include, for example, a rear wall forming the rear of the cab, and left and right walls forming the left and right sides of the cab. The rear wall sometimes has a sill defining a rear window, and the left and right walls sometimes have sills defining side windows. The rear and side windows are provided to ensure the operator's visibility.

[0003] For example, when construction machinery overturns or tipes over, a significant load is applied to the upper part of the cab. Therefore, from the perspective of ensuring operator safety, the cab of construction machinery must have the rigidity to ensure the internal space of the cab in the event of an overturn or tipping over.

[0004] Japanese Patent Publication No. 2007-46396 (Patent Document 1) describes a construction machine that, in order to improve the effect of suppressing deformation in the left and right directions of the cab, includes a load transfer beam that transfers the lateral load applied to the left rear pillar from the left side to the right rear pillar. Japanese Patent Publication No. 2004-42739 (Patent Document 2) describes a construction machine that includes a transverse member that connects the left and right rear pillars at the midpoint in the vertical direction.

[0005] However, in the engineering machinery described in Patent Documents 1 and 2, when a large load is applied to the upper part of the cab, the portion near the lower corner of the window edge in the cab wall is prone to breakage. Specifically, the rear window edge includes the left longitudinal edge, the lower lower edge, and the corner connecting these edges. When the engineering machinery rolls over and a lateral load, for example, is applied to the upper part of the cab from the left, the portion near the lower corner (corner near edge) is prone to breakage. When the corner near edge breaks, the rigidity of the cab decreases. Furthermore, Japanese Patent Publication Nos. 2010-270557 (Patent Document 3), 2010-255215 (Patent Document 4), and 2020-169454 (Patent Document 5) disclose the structure of the engineering machinery cab, but do not consider preventing breakage of the portion near the lower corner of the window edge. Summary of the Invention

[0006] The present invention was made in view of the aforementioned problems, and its object is to provide an engineering machine that can ensure visibility through the window and can suppress breakage near the lower corner of the window edge, i.e., near the corner, even when a load is applied to the upper part of the cab, thereby suppressing a decrease in the rigidity of the cab.

[0007] The provided engineering machinery includes: an upper frame supported by a lower walking body; and a cab, a box having a defined interior space and supported by the upper frame; wherein the cab includes: a plurality of walls surrounding the interior space front-to-back and left-to-right; and a load-transfer member disposed along any one of the plurality of walls, i.e., a specific wall, the specific wall having: a wall side edge, which is a longitudinally extending side edge located at the end of the width direction of the specific wall; and a window edge defining a window disposed on the inner side of the wall side edge in the width direction, the window edge comprising: a longitudinal edge extending in the direction along the wall side edge; a lower edge extending in a direction intersecting the extension direction of the longitudinal edge; and a lower corner portion, which... The load-transferring member, connected to the longitudinal side and the lower side, comprises: an upper column portion extending downward from the upper part of the specific wall portion along the longitudinal side on the outer side of the longitudinal side of the window edge in the wall width direction; a middle portion extending from above the lower corner portion and on the outer side of the lower corner portion in the wall width direction, avoiding the window, to below the lower corner portion and on the inner side of the lower corner portion in the wall width direction; and a beam portion extending below the window from the middle portion away from the side edge of the wall portion, the upper column portion, the middle portion, and the beam portion being continuous in this order so as to transfer the load applied to the upper part of the cab in the direction along the specific wall portion to the upper frame, wherein at least the middle portion of the load-transferring member is formed by a single component.

[0008] According to the present invention, visibility can be ensured through the window, and even when a load is applied to the upper part of the cab, breakage can be suppressed at the lower corner of the window edge, i.e., the corner-near part, thereby suppressing a decrease in the rigidity of the cab. Attached Figure Description

[0009] Figure 1 This is a side view showing the engineering machinery according to the first embodiment of the present invention.

[0010] Figure 2 This is a top view showing the upper frame and driver's cab of the engineering machinery.

[0011] Figure 3 This is a perspective view of the driver's cab.

[0012] Figure 4 This is a diagram with some components of the cab omitted to illustrate the structure of the cab.

[0013] Figure 5 It is a perspective view showing the multiple columns, multiple beams, multiple lower frames and load transfer components in the cab, as well as the main frame and frame components in the upper frame.

[0014] Figure 6 This is a front view showing the rear wall (back side) of the cab and the load transfer components.

[0015] Figure 7 This is a front view showing the rear wall of the cab and the load transfer component in the engineering machinery according to the modified example 1 of the first embodiment.

[0016] Figure 8 This is a front view showing the rear wall of the cab and the load transfer components of the engineering machinery involved in the modified example 2 of the first embodiment.

[0017] Figure 9 This is a front view showing the rear wall of the cab and the load transfer components of the engineering machinery involved in the modified example 3 of the first embodiment.

[0018] Figure 10 This is a perspective view showing a portion of the cab and upper frame of the engineering machinery involved in the modified example 4 of the first embodiment.

[0019] Figure 11 yes Figure 10 A cross-sectional view along line XI-XI.

[0020] Figure 12 This is a perspective view showing a portion of the cab and upper frame of the engineering machinery involved in the modified example 5 of the first embodiment.

[0021] Figure 13 yes Figure 12 A cross-sectional view of line XIII-XIII.

[0022] Figure 14 This is a front view showing the rear wall of the cab and the load transfer components of the engineering machinery involved in the modified example 6 of the first embodiment.

[0023] Figure 15 This is a perspective view showing a portion of the cab and upper frame of the engineering machinery involved in the modified example 7 of the first embodiment.

[0024] Figure 16 This is a perspective view showing a portion of the cab and upper frame of the engineering machinery involved in the modified example 8 of the first embodiment.

[0025] Figure 17 This is a perspective view showing a portion of the cab and upper frame of the engineering machinery involved in the second embodiment.

[0026] Figure 18 This is a side view showing the right wall of the cab and the load transmission components of the engineering machinery according to the second embodiment.

[0027] Figure 19 This is a perspective view showing the left wall of the cab and the load transmission components of the engineering machinery according to the second embodiment.

[0028] Figure 20 This is a side view showing the left wall of the cab and the load transfer components of the engineering machinery according to the second embodiment. Detailed Implementation

[0029] The engineering machinery involved in the embodiments of the present invention will be described below with reference to the accompanying drawings.

[0030] [First Embodiment]

[0031] Figure 1 This is a side view showing the hydraulic excavator 10 according to the first embodiment of the present invention. The hydraulic excavator 10 is an example of construction machinery. Figure 1 As shown, the hydraulic excavator 10 includes a lower traveling body 11, an upper slewing body 12 rotatably supported by the lower traveling body 11, a working device 13, and a plurality of hydraulic actuators.

[0032] The upper rotating body 12 includes an upper frame 20 rotatably supported by a lower traveling body 11, a cab 30 supported by the upper frame 20, and a counterweight 29 disposed behind the cab 30.

[0033] The working device 13 includes a boom 14 that is undulatingly supported by an upper frame 20, a stick 15 that is swingably supported by the distal end of the boom 14, and a bucket 16 that is swingably supported by the distal end of the stick 15.

[0034] Multiple hydraulic actuators include: a boom cylinder 17, which operates by receiving a supply of working oil from a hydraulic pump (not shown) to cause the boom 14 to move up and down; a stick cylinder 18, which operates by receiving a supply of working oil from the hydraulic pump to cause the stick 15 to move oscillating; a bucket cylinder 19, which operates by receiving a supply of working oil from the hydraulic pump to cause the bucket 16 to move oscillating; and a swing motor (not shown), which operates by receiving a supply of working oil from the hydraulic pump to cause the upper frame 20 to move oscillating.

[0035] Figure 2 This is a top view showing the upper frame 20 and the cab 30 of the hydraulic excavator 10. Figure 3 This is a three-dimensional view showing the driver's cab 30. Figure 4 This is a diagram with some components of the cab 30 omitted in order to illustrate the structure of the cab 30. Figure 5 This is a three-dimensional view showing the frame of the driver's cab 30.

[0036] like Figure 2 and Figure 5 As shown, the upper frame 20 includes a frame body 23 having an upper side for mounting the cab 30 and a boom support 21 disposed on the upper side of the frame body 23. The frame body 23 includes a central portion 23A and a side platform 23B. The side platform 23B is disposed to the left of the central portion 23A and is supported by the central portion 23A. Although not shown in the figure, a side platform is also disposed to the right of the central portion 23A. The boom support 21 is the portion for mounting the base end of the boom 14, which supports the boom 14 in an undulating manner. The boom support 21 includes a pair of vertical plates 21A and 21B. The pair of vertical plates 21A and 21B are spaced apart from each other in the left-right direction, are plate-shaped members extending in the front-rear direction, and rise upward from the upper side of the central portion 23A of the frame body 23. The boom support 21 is located on the left side of the central portion 23A. Figure 2 The upper frame 20 shown is positioned near the center of the frame body 23 in the width direction W (width direction W of the frame body 23). The width direction W of the upper frame 20 is the left-right direction. The left vertical plate 21A of the boom support 21 is positioned adjacent to the cab 30 on its inner side in the width direction W (right side in the embodiment).

[0037] like Figure 2 As shown, the cab 30 is supported by the frame body 23 of the upper frame 20 at a position offset from the center of the upper frame in the width direction W (left side in this embodiment). Specifically, the cab 30 is disposed on the side platform 23B of the frame body 23. The cab 30 has a box that defines the interior space. The driver's seat, control lever, control pedals, etc. (not shown) are arranged in the interior space of the cab 30.

[0038] like Figure 3As shown, the cab 30 has: a front wall portion 30F, located at the front of the interior space, with a front window 51; a rear wall portion 30B, located at the rear of the interior space, with a rear window 53; a left wall portion 30L, located on the left side of the interior space, with an opening / closing door 50; a right wall portion 30R, located on the right side of the interior space, with a right window; an upper wall portion 30T, located on the upper side of the interior space; and a lower wall portion 30U, located on the lower side of the interior space, having the floor surface of the cab 30. The opening / closing door 50 has a left window 52. The cab 30 has multiple columns, multiple beams, multiple lower frame members, and load transfer members 60. The rear wall portion 30B is an example of a specific wall portion. The front wall portion 30F, the rear wall portion 30B, the left wall portion 30L, and the right wall portion 30R are examples of a plurality of walls surrounding the interior space at the front, rear, left, and right.

[0039] like Figure 5 As shown, the multiple columns include a left front column 35, a right front column 36, a left rear column 37, a first right rear column 38, a second right rear column 39, and a left middle column 44. The multiple lower frame structures include a front lower frame 31, a rear lower frame 32, a left lower frame 33, and a right lower frame 34. The multiple beams include a front upper beam 40, a rear upper beam 41, a left upper beam 42, and a right upper beam 43. The front lower frame 31, rear lower frame 32, front upper beam 40, and rear upper beam 41 are structural members extending in the left-right direction (width direction W). The left lower frame 33, right lower frame 34, left upper beam 42, and right upper beam 43 are structural members extending in the front-back direction. Each of the multiple columns is a structural member extending in the vertical direction or in a direction inclined relative to the vertical direction.

[0040] The rear wall portion 30B is configured to rise upwards from the side platform 23B of the main frame body 23 of the upper frame 20, forming the rear of the cab 30. (As...) Figure 6 As shown, the rear wall portion 30B has a rectangular shape when viewed from the front. The rear wall portion 30B includes a rear plate 54. The rear plate 54 has: a left end connected to the left rear pillar 37; a right end connected to the first right rear pillar 38; a lower end connected to the rear lower frame 32; and an upper end connected to the rear upper beam 41.

[0041] like Figure 4 and Figure 6 As shown, the rear plate 54 of the rear wall portion 30B has a width direction, i.e., the wall width direction W1, located in the width direction of the rear wall portion 30B (refer to...). Figure 2 and Figure 6The left end of the wall portion and the left edge extending longitudinally is the wall side edge E1. In the first embodiment, the wall width direction W1 is the left-right direction. The extending direction of the wall side edge E1, i.e., the longitudinal direction, can be the up-down direction or a direction inclined relative to the up-down direction. Furthermore, the wall side edge E1 can be as follows: Figure 4 As shown, the longitudinal direction extends from the upper end to the lower end of the rear wall portion 30B while changing the direction of extension of the side edge E1 of the wall portion. The longitudinal direction also includes the concept of such a shape.

[0042] The left rear pillar 37 is an example of a rear pillar in this invention. The left rear pillar 37 extends downwards along the side edge E1 of the wall portion from the upper end of the rear wall portion 30B to the lower end of the rear wall portion 30B. The left rear pillar 37 extends downwards from the rear end of the left upper beam 42 to the rear end of the left lower frame 33. The first right rear pillar 38 extends downwards along the right side edge of the rear plate 54 located at the right end in the wall width direction W1 from the upper end of the rear wall portion 30B to the lower end of the rear wall portion 30B. The first right rear pillar 38 extends downwards from the rear end of the right upper beam 43 to the rear end of the right lower frame 34. The rear upper beam 41 extends along the wall width direction W1 to connect the upper end of the left rear pillar 37 to the upper end of the first right rear pillar 38. The rear lower frame 32 extends along the wall width direction W1 to connect the lower end of the left rear pillar 37 to the lower end of the first right rear pillar 38. The second right rear pillar 39 is positioned adjacent to the first right rear pillar 38 on the front side of the first right rear pillar 38, extending downward from the rear end of the upper right beam 43 to the rear end of the lower right frame 34.

[0043] like Figure 4 and Figure 6 As shown, the rear panel 54 has an opening at its upper part. This opening in the rear panel 54 constitutes a rear window 53. The rear panel 54 has a window rim defining the rear window 53 (the opening). A window pane is installed on this window rim.

[0044] The window edge of the rear panel 54 includes an upper edge S1, a lower edge S2, an inner edge S3 (right edge S3), and an outer edge S4 (left edge S4). The outer edge S4 is an example of a longitudinal edge. The outer edge S4 is an edge extending in the direction along the wall side edge E1 of the rear wall portion 30B, and the lower edge S2 is an edge extending in the direction intersecting the extending direction of the outer edge S4. Specifically, the upper edge S1 and the lower edge S2 extend at intervals in the vertical direction in the wall width direction W1 (width direction W of the upper frame 20) of the rear wall portion 30B. The inner edge S3 is located inside the width direction W (right side in this embodiment) relative to the upper edge S1 and the lower edge S2, and extends in the vertical direction. The outer edge S4 is located outside the width direction W (left side in this embodiment) relative to the upper edge S1 and the lower edge S2, and extends in the vertical direction. The window edge further includes: an outer lower corner portion C1 connecting the outer edge S4 and the lower edge S2; an inner lower corner portion C2 connecting the inner edge S3 and the lower edge S2; an outer upper corner portion C3 connecting the outer edge S4 and the upper edge S1; and an inner upper corner portion C4 connecting the inner edge S3 and the upper edge S1. The outer lower corner portion C1 is an example of a lower corner portion.

[0045] In this embodiment, the outer lower corner portion C1 has a shape that shifts to the right (inner side of the width direction W) as it extends downward from the lower end of the outer edge S4. On the other hand, the outer edge S4 has a shape that extends in the vertical direction, and the lower edge S2 has a shape that extends in the horizontal direction (width direction W). Specifically, the outer lower corner portion C1 has a curved shape that smoothly connects the lower end of the outer edge S4 and the left end of the lower edge S2. The inner lower corner portion C2 has a shape that shifts to the left (outer side of the width direction W) as it extends downward from the lower end of the inner edge S3. However, both the outer lower corner portion C1 and the inner lower corner portion C2 may be formed by, for example, approximately right angles. In this embodiment, the upper edge S1, the lower edge S2, the inner edge S3, and the outer edge S4 may each extend in a straight line, and at least one of the upper edge S1, the lower edge S2, the inner edge S3, and the outer edge S4 may also include a curved portion.

[0046] The load transfer member 60 is fixed to at least one of the rear plate 54, the left rear pillar 37, and the first right rear pillar 38 of the rear wall portion 30B. The load transfer member 60 has an upper pillar portion 64, a middle portion 62, and a beam portion 65. The upper pillar portion 64 is the portion extending downward from the upper part of the rear wall portion 30B along the outer side of the outer edge S4 in the wall width direction W1, i.e., on the left side (outer side of the width direction W), i.e., at the upper outer position, avoiding the rear window 53, to the lower outer corner C1, and to the inner side of the outer lower corner C1 in the wall width direction W1, i.e., on the right side (inner side of the width direction W), i.e., at the lower inner position. The beam portion 65 is the portion extending from the middle portion 62 away from the side edge E1 of the wall portion. Specifically, the beam 65 is the part that extends from the right end (inner end in the width direction W) of the middle part 62 toward the right side (inner side in the width direction W) of the skeleton component that constitutes the part of the upper skeleton 20 below the rear window 53.

[0047] In this embodiment, the load transfer member 60 is formed entirely from a single component. In other words, the load transfer member 60 is not formed by connecting multiple components through welding. Therefore, the load transfer member 60 does not have a welded portion on the middle portion 62 near the outer lower corner C1, i.e., near the corner. The welded portion referred to here is a welded portion for forming the load transfer member 60, not a welded portion for fixing the load transfer member 60 to, for example, the rear wall portion 30B. The load transfer member 60 can be manufactured using forming methods such as extrusion molding, but the forming method is not limited to extrusion molding. The load transfer member 60 has a closed cross-section with a cross-sectional shape such as a quadrilateral, but the shape of the closed cross-section can also be, for example, circular or elliptical. These points also apply to the left and right load transfer members 70R and 70L involved in the second embodiment described later.

[0048] The upper column 64, the middle section 62, and the beam section 65 are arranged in this sequence to transfer the lateral load F applied to the upper part of the cab 30 from the left side (outer side in the width direction W) to the frame components. In this embodiment, the frame components include a left vertical plate 21A of the boom support 21 and a connecting member 22 mounted on the left vertical plate 21A. The left vertical plate 21A and the connecting member 22 constitute a part of the upper frame 20.

[0049] The upper end portion 61 of the upper column portion 64, which is also the upper end portion 61 of the load transfer member 60, is connected to the rear upper beam 41. The height position of the upper end portion 61 of the load transfer member 60 coincides with or is near the height position of the lateral load F borne by the upper part of the cab 30 from the left side when the hydraulic excavator 10 rolls to the left. The upper column portion 64 is located inside the left rear column 37 in the wall width direction W1, that is, on the right side (inside the width direction W), and extends downward along the upper part of the left rear column 37 when adjacent to the left rear column 37. The upper column portion 64 is positioned between the left rear column 37 and the outer edge S4 of the window sill when viewed from the front. In this embodiment, the upper end portion 61 of the load transfer member 60 is located above the outer upper corner portion C3, but it may also be located below the outer upper corner portion C3. The upper end portion 61 of the load transfer member 60 is located outside the wall width direction W1, that is, on the left side (outside the width direction W), relative to the outer upper corner portion C3.

[0050] In this embodiment, the middle portion 62 has a portion that curves downwards away from the side edge E1 of the wall portion. When viewed directly, the middle portion 62 has a portion that curves and extends outwards from the outer lower corner C1, avoiding the curved shape. When viewed directly, the middle portion 62 has a portion that curves to cover the outer side of the outer lower corner C1.

[0051] The beam portion 65 has a shape that extends in a straight line toward the left vertical plate 21A of the boom support portion 21 as it moves downward away from the side edge E1 of the wall portion. In other words, the beam portion 65 has a shape that extends in a straight line toward the frame component as it moves downward toward the right side (inside the width direction W) from the inner end of the middle portion 62. By having a straight shape that slopes downward to the right, the radius of curvature of the curved portion of the middle portion 62 can be reduced to a smaller size, and the middle portion 62 can be formed into a gently curved shape.

[0052] The right end 63 (the inner end on the inside of the width direction W) of the beam 65, which is also the right end 63 (lower end 63) of the load transfer member 60, is connected to the first right rear pillar 38. The right end 63 of the load transfer member 60 is arranged continuously with the left vertical plate 21A of the upper frame 20 via the first right rear pillar 38 and the connecting member 22. Thus, the load transfer member 60 can transfer the lateral load F applied to the upper part of the cab 30 from the left to the left vertical plate 21A. Alternatively, the connecting member 22 can be omitted, and the right rear pillar 38 can be directly connected to the left vertical plate 21A.

[0053] In the hydraulic excavator 10 according to this embodiment, the upper column portion 64 extends downward along the outer edge S4 of the window, the middle portion 62 extends in a manner that avoids the rear window 53, and the beam portion 65 extends below the rear window 53. Therefore, the load transfer member 60 does not overlap with the rear window 53, ensuring visibility and escape route through the rear window 53 while also transferring lateral loads F to the frame components. Moreover, since the middle portion 62 of the load transfer member 60 is formed by a single component, even when a lateral load F is applied to the upper part of the cab 30, it is possible to prevent the middle portion 62 from breaking, thereby preventing a decrease in the rigidity of the cab 30.

[0054] Specifically, the load transfer member 60 does not have a welded portion near the corner. Therefore, when a lateral load F is applied to the upper part of the cab, the load transfer member 60 can prevent breakage at the middle portion 62 located near the corner, thereby preventing a decrease in the rigidity of the cab 30, and can transfer the lateral load F to the frame components of the upper frame 20 via the upper pillar portion 64, the middle portion 62, and the beam portion 65. Due to the high strength of the upper frame 20, the left vertical plate 21A constituting a part of the upper frame 20 can withstand the lateral load F transferred via the load transfer member 60.

[0055] Therefore, when a lateral load F is applied to the upper part of the cab 30, the load transfer member 60 is supported by the left vertical plate 21A, and the middle part 62 of the load transfer member 60 located near the corner is prevented from breaking. Furthermore, the load transfer member 60 is configured not to overlap with the rear window 53. Thus, the hydraulic excavator 10 can both ensure visibility and escape route through the rear window 53 and prevent breakage near the corner, thereby suppressing a decrease in cab rigidity.

[0056] On the other hand, the engineering machinery disclosed in Patent Documents 1 and 2 each have a structure near the center of the left rear pillar (left support) extending vertically in the vertical direction, connecting the left end of a beam (transverse member) extending in a generally horizontal direction. Therefore, the welded portion connecting the left end to the left rear pillar is located near the lower left corner of the window edge, i.e., near the corner. Therefore, when a lateral load is applied to the upper part of the cab, causing the window edge to deform around the lower left corner and with the longitudinal edge of the window edge approaching the lower edge, breakage is likely to occur at the welded portion near the corner.

[0057] In this embodiment, not only the intermediate part 62 but also the entire load transfer member 60 is formed from a single member, rather than being formed by connecting multiple members by welding. Therefore, it is possible to suppress the occurrence of fracture caused by welding points as a whole in the load transfer member 60.

[0058] In this embodiment, the middle portion 62 has a portion that bends in a manner that extends downward from the lower end of the upper pillar portion 64 and shifts inward in the wall width direction W1, i.e., to the right (inward in the width direction W). Therefore, a spring effect can be obtained in this middle portion 62. As a result, when a lateral load F is applied to the upper part of the cab 30, the load transmission member 60 can effectively absorb a portion of the energy of the lateral load F. Therefore, it is possible to further suppress breakage at the middle portion 62 located near the corner.

[0059] In this embodiment, the beam portion 65 has a shape that extends linearly toward the frame member as it extends downward toward the right (inside the width direction W) from the inner end of the intermediate portion 62. Therefore, even when the frame member is positioned below the inner end of the intermediate portion 62, the lateral load F can be linearly and efficiently transmitted to the frame member by means of the beam portion 65, which extends linearly and in a downward inclination toward the frame member from the inner end of the intermediate portion 62.

[0060] In this embodiment, the upper column portion 64 of the load transfer member 60 is located on the inner side (i.e., the right side, in the width direction W) of the left rear column 37 (outer column) in the wall width direction W1, and extends downward along the left rear column 37 when adjacent to it. In this way, the load transfer member 60 is provided as a different member from the left rear column 37, so the rigidity of the cab 30 against lateral load F can be further improved, and the lateral load F applied to the upper part of the cab 30 is efficiently transferred via the left rear column 37 to the upper column portion 64 of the load transfer member 60, which is adjacent to the left rear column 37 and extends downward along the left rear column 37.

[0061] [Modifications of the first embodiment]

[0062] The above describes the engineering machinery according to the first embodiment of the present invention. However, the present invention is not limited to the above-described solution and includes, for example, the following modifications.

[0063] Figure 7 This is a front view showing the rear wall 30B of the cab 30 and the load transmission member 60 of the hydraulic excavator 10 according to a variation 1 of the first embodiment. Figure 7As shown, the load-transferring member 60 involved in Modification 1 is formed by connecting the upper column 64, the middle section 62, and the beam section 65 using a connection method such as welding. Specifically, the lower end of the upper column 64 and the upper end 62A of the middle section 62 are connected at the connection 601, and the right end 62B of the middle section 62 and the left end of the beam section 65 are connected at the connection 602. The connection method is not limited to welding, but can also be other methods such as bolt fastening. The middle section 62 is formed by a single member. The middle section 62 extends from above the lower outer corner C1 and to the lower outer corner C1 and to the lower outer corner C1 and to the right outer corner C1 and to the right outer corner C1, i.e., the inner side of the wall width direction W1, i.e., the inner lower position, in a manner that avoids the rear window 53.

[0064] like Figure 7 As shown, the upper end portion 62A of the middle portion 62 extends in the same direction as the extending direction of the upper column portion 64 (vertical direction in Variation 1). Furthermore, the right end portion 62B of the middle portion 62 extends in the same direction as the extending direction of the beam portion 65 (slanting downwards to the right in Variation 1). Specifically, the middle portion 62 includes: an upper straight portion, which includes the upper end portion 62A and extends in the same direction as the extending direction of the upper column portion 64; a lower straight portion, which includes the right end portion 62B and extends in the same direction as the extending direction of the beam portion 65; and a curved portion connecting the upper and lower straight portions. Furthermore, Figure 6 The middle part 62 shown and described later Figures 8 to 16 The middle part 62 shown can also be combined with Figure 7 The intermediate portion 62 shown also includes: an upper straight portion, which extends in the same direction as the upper column portion 64; a lower straight portion, which extends in the same direction as the beam portion 65; and a curved portion connecting the upper and lower straight portions. (To be described later...) Figures 17 to 20 The intermediate portions 74R and 74L shown may each include: an upper straight portion, which extends in the same direction as the extension direction of the upper column portion 64; a lower straight portion, which extends in the same direction as the extension direction of the beam portion 65; and a curved portion that connects the upper straight portion and the lower straight portion.

[0065] Other structures and references of the hydraulic excavator 10 involved in Modification Example 1 Figures 1 to 6 The same applies to the hydraulic excavator 10 described in the first embodiment.

[0066] Figure 8This is a front view showing the rear wall 30B of the cab 30 and the load transmission member 60 of the hydraulic excavator 10 according to a modified example 2 of the first embodiment. Figure 8 As shown, the load transfer member 60 may also have a lower column portion 66 extending downward from the right end 63 (the inner end on the inside of the width direction W) of the beam portion 65. In this modified example 2, the load transfer member 60 further has a lower column portion 66, which further improves the rigidity of the load transfer member 60, and thus, further improves the rigidity of the cab 30. The lower column portion 66 extends from the inner end of the beam portion 65 to the lower end of the rear wall portion 30B. However, the lower column portion 66 may not necessarily extend to the lower end of the rear wall portion 30B; it may also be shaped such that it extends to a height position between the inner end of the beam portion 65 and the lower end of the rear wall portion 30B. Furthermore, it is preferable that the lower column portion 66 has a lower end that contacts the rear lower frame 32 or the lower wall portion 30U of the rear wall portion 30B. Therefore, the load transfer member 60 can not only transfer the lateral load F to the left vertical plate 21A of the upper frame 20, but also transfer the lateral load F to the side platform 23B of the upper frame 20 via the rear lower frame 32 or the lower wall 30U of the rear wall portion 30B. Furthermore, in Figure 8 In the modified example 2 shown, the lower column 66 extends downward from the right end 63 of the beam 65. However, it may also extend downward from the middle part of the beam 65, that is, the part between the right end 63 of the beam 65 and the left end of the beam 65.

[0067] The connection between the right end 63 of the beam 65 and the upper end of the lower column 66 has a curved shape. Therefore, this connection smoothly undergoes elastic deformation in the bending direction, thus achieving a spring effect. Consequently, when a lateral load is applied to the upper part of the cab, the load-transferring member can more effectively absorb a portion of the lateral load's energy.

[0068] The lower pillar portion 66 has a right side surface that contacts the first right rear pillar 38, and this right side surface can be welded to the right rear pillar 38. In addition, the lower pillar portion 66 has a lower end that contacts the rear lower frame 32 or the lower wall portion 30U, and this lower end can be welded to the rear lower frame 32 or the lower wall portion 30U.

[0069] Other structures and references of the hydraulic excavator 10 involved in Modification Example 2 Figures 1 to 6 The same applies to the hydraulic excavator 10 described in the first embodiment.

[0070] Figure 9 This is a front view showing the rear wall 30B of the cab 30 and the load transmission member 60 of the hydraulic excavator 10 according to a variation 3 of the first embodiment. Figure 9As shown, the beam 65 involved in Modification 3 has a shape that extends in a generally horizontal straight line from the inner end of the middle portion 62 toward the inner side, i.e., the right side (inner side of the width direction W), in the wall width direction W1. Other structures of the hydraulic excavator 10 involved in Modification 3 are similar to those in the reference section. Figures 1 to 6 The same applies to the hydraulic excavator 10 described in the first embodiment.

[0071] Furthermore, although the illustration is omitted, the beam portion of the load-transferring member may also have a shape that extends in a straight or curved manner toward the frame component as it extends upward from the right end (inner end) of the middle portion toward the inside in the width direction W. Even in this case, the beam portion has a shape that extends toward the frame component toward the inside in the width direction W of the middle portion, i.e., the inner end, toward the frame component below the rear window.

[0072] In the first embodiment, the frame components are the left vertical plate 21A and the connecting member 22 of the boom support 21. However, the frame components in this invention can be any components that form part of the upper frame 20 and can bear the transmitted load through the load transfer member 60 when the cab 30 rolls over or overturns. They can also be components other than the left vertical plate 21A and the connecting member 22. Examples of such frame components include, for instance, variations 4 to 8 described later. Figures 10 to 16 The side platform 23B of the upper frame 20.

[0073] In the first embodiment, the cab 30 has a left rear pillar 37 (outer pillar), however, if the construction machinery is a relatively small type, the outer pillar may be omitted.

[0074] The technology involved in this invention can also be applied to engineering machinery other than hydraulic excavators 10.

[0075] In the first embodiment, the upper column portion 64, the middle portion 62, and the beam portion 65 of the load transfer member 60 contact the rear wall portion 30B. However, at least one of the middle portion 62 and the beam portion 65 of the load transfer member 60 may not contact the rear wall portion 30B.

[0076] In the first embodiment, by connecting the inner end (right end 63, the right end 63 of the beam portion 65) of the load transfer member 60 in the width direction W to the first right rear pillar 38, the load transfer member 60 can transfer the lateral load F applied to the upper part of the cab 30 from the left to the left vertical plate 21A of the frame component. However, this is not a limitation. The right end 63 of the load transfer member 60 can also be directly connected to the frame component. In this case, the first right rear pillar 38 can be configured with an upper pillar portion and a lower pillar portion, and the beam portion 65 of the load transfer member 60 is located between the upper pillar portion and the lower pillar portion. Even in this case, the load transfer member 60 can still transfer the lateral load F applied to the upper part of the cab 30 from the left to the left vertical plate 21A of the frame component.

[0077] Furthermore, the first right rear column 38 can also be a component consisting of an upper column, a lower column, and an intermediate column located between these columns, with these columns continuously connected in the vertical direction. The right end 63 of the load-transfer member 60 can also be connected to the intermediate column of the first right rear column 38. In this case, it is ideal that the rigidity of the intermediate column is higher than that of the upper and lower columns.

[0078] It can also be omitted Figures 6 to 9 The connecting member 22 is shown in the figure. In this case, the right end 63 of the load transfer member 60 can be directly connected to the left vertical plate 21A of the frame component as described above, or the first right rear column 38 can be directly connected to the left vertical plate 21A of the frame component. Furthermore, if the connecting member 22 is omitted, the cab 30 may not be connected to the left vertical plate 21A, and the cab 30 may be arranged at a distance from the left vertical plate 21A in the width direction W (left-right direction). Even in this case, since the left vertical plate 21A is arranged adjacent to the cab 30 on the inside of the width direction W, i.e., on the right side, it is possible to achieve the desired effect. Figures 6 to 9 When the lateral load F, as represented by the symbol, is applied to the upper part of the cab 30, the cab 30 deforms to a certain extent to the right (inside the width direction W), and the right side of the cab 30 comes into contact with the left vertical plate 21A. As a result, the load transfer member 60 can transfer the lateral load F to the left vertical plate 21A, which is a structural member of the frame.

[0079] Figure 10 This is a perspective view showing a portion of the cab 30 and upper frame 20 of the hydraulic excavator 10 according to Modification 4 of the first embodiment. Figure 11 yes Figure 10 A cross-sectional view along line XI-XI.

[0080] In variation 4, the hydraulic excavator 10 has a beam 65 of the load transmission member 60 extending in the direction of the support described later. Figures 1 to 6 The hydraulic excavator 10 described in the first embodiment differs from that in the modified example 4. Other structural features of the hydraulic excavator 10 are also different. Figures 1 to 6 The first embodiment shown is the same.

[0081] exist Figure 10 The hydraulic excavator 10 involved in the modified example 4 shown is similar to... Figure 5 Similarly, the hydraulic excavator 10 shown also has an upper frame 20 comprising a frame body 23 and a boom support 21. The frame body 23 includes a central section 23A and side platforms 23B. Figure 10 and Figure 11 As shown, the side platform 23B includes a platform body 231 and multiple supports 232 (e.g., four supports 232). The platform body 231 is supported by a central portion 23A and is positioned directly below the lower wall portion 30U of the cab 30. The platform body 231 has, for example, a size and shape that covers the lower wall portion 30U of the cab 30 from below. The four supports 232 are vibration damping supports provided to suppress vibrations of the cab 30. The four supports 232 are as follows: Figure 10 As shown by the four dashed circles, they are positioned at the four corners of the lower wall 30U of the cab 30, between the lower wall 30U of the cab 30 and the platform body 231, thereby supporting the cab 30. Figure 11 As shown, the four supports 232 are supported by the main body of the table 231.

[0082] The lower end 63 (right end 63) of the load transfer member 60 is located directly above the right rear support 232, which is positioned at the right rear of the four supports 232, and is connected to the lower part of the cab 30. In top view, the lower end 63 of the load transfer member 60 is connected to the lower part of the cab 30 at a position overlapping with the right rear support 232. Figure 10 In the specific example shown, the lower part of the cab 30 connected to the lower end 63 of the load transfer member 60 is the portion including the boundary between the first right rear pillar 38 and the rear lower frame 32. However, the lower end 63 of the load transfer member 60 may be connected only to the rear lower frame 32, or only to the lower wall portion 30U. The right rear support 232 is an example of a specific support.

[0083] In the hydraulic excavator 10 involved in this variation 4, since the lower end 63 of the load transfer member 60 is positioned directly above the right rear support 232 of the upper frame 20, the load transfer member 60 can efficiently transfer the lateral load F applied to the upper part of the cab 30 from the left to the right rear support 232 of the upper frame 20.

[0084] Figure 12 This is a perspective view showing a portion of the cab 30 and upper frame 20 of the hydraulic excavator 10 according to Modification 5 of the first embodiment. Figure 13 yes Figure 12 A cross-sectional view of line XIII-XIII.

[0085] In Modification 5, the hydraulic excavator 10 has a beam 65 of the load transmission member 60 extending in a direction toward the lower end of the first right rear column 38, which is consistent with... Figures 1 to 6 The hydraulic excavator 10 described in the first embodiment differs from that in the modified example 5. Other structural features of the hydraulic excavator 10 are also different. Figures 1 to 6 The first embodiment shown is the same.

[0086] In the hydraulic excavator 10 involved in this variation 5, since the lower end 63 of the load transfer member 60 is connected to the lower end of the first right rear column 38, the load transfer member 60 can transfer the lateral load F applied to the upper part of the cab 30 from the left side to the side platform 23B of the upper frame 20 via the first right rear column 38. Furthermore, the extension direction of the beam portion 65 of the load transfer member 60 can also be towards the lower end of the second right rear column 39; in this case, the lower end 63 of the load transfer member 60 is connected to the lower end of the second right rear column 39.

[0087] Figure 14 This is a front view showing the rear wall 30B of the cab 30 and the load transmission member 60 of the hydraulic excavator 10 according to the modified example 6 of the first embodiment.

[0088] In Modification 6, the hydraulic excavator 10 has a portion of the load transfer member 60 whose extension direction is towards the lower part of the cab 30, relative to the first right rear pillar 38, and located on the left side. Figures 1 to 6 The hydraulic excavator 10 described in the first embodiment differs from that in the modified embodiment 6. Other structural features of the hydraulic excavator 10 in the modified embodiment 6 are also different. Figures 1 to 6 The first embodiment shown is the same.

[0089] In the hydraulic excavator 10 of this variation 6, the lower end 63 of the load transfer member 60 is connected to the rear lower frame 32. Specifically, the lower end 63 of the load transfer member 60 is connected to a portion of the rear lower frame 32 that is closer to the lower end of the first right rear column 38 than the lower end of the left rear column 37. In this variation 6, the load transfer member 60 can transfer the lateral load F applied to the upper part of the cab 30 from the left side to the side platform 23B of the upper frame 20 via the rear lower frame 32.

[0090] Figure 15 This is a perspective view showing a portion of the cab 30 and upper frame 20 of the hydraulic excavator 10 according to the modified example 7 of the first embodiment.

[0091] In Modification 7, the hydraulic excavator 10 has a portion of the load transfer member 60 whose beam 65 extends towards the lower part of the cab 30 and is located in front of the right rear pillars 38 and 39. Figures 1 to 6 The hydraulic excavator 10 described in the first embodiment differs from that in the modified example 7. Other structural features of the hydraulic excavator 10 are also different. Figures 1 to 6 The first embodiment shown is the same.

[0092] In the hydraulic excavator 10 of this variation 7, the lower end 63 of the load transfer member 60 is connected to the portion of the lower part of the cab 30 located in front of the second right rear pillar 39. Specifically, the lower end 63 of the load transfer member 60 is connected to the lower right frame 34 in front of the second right rear pillar 39. More specifically, the lower end 63 of the load transfer member 60 is connected to the lower right frame 34 in a manner adjacent to the lower end of the second right rear pillar 39 front and rear. In this variation 7, the load transfer member 60 can transfer the lateral load F applied to the upper part of the cab 30 from the left side to the side platform 23B of the upper frame 20 via the lower right frame 34.

[0093] Figure 16 This is a perspective view showing a portion of the cab 30 and upper frame 20 of the hydraulic excavator 10 according to a variation 8 of the first embodiment.

[0094] In Modification 8, the hydraulic excavator 10 has a beam 65 of the load transmission member 60 extending in a direction toward the lower wall 30U (the floor surface of the lower wall 30U), which is consistent with... Figures 1 to 6 The hydraulic excavator 10 described in the first embodiment differs from that in the modified example 8. Other structural features of the hydraulic excavator 10 are also different. Figures 1 to 6 The first embodiment shown is the same.

[0095] In the hydraulic excavator 10 of this modified example 8, the lower end 63 of the load transfer member 60 is connected to the lower wall portion 30U on the front side of the rear lower frame 32. Specifically, the lower end 63 of the load transfer member 60 is connected to a portion of the lower wall portion 30U that is closer to the lower end of the first right rear column 38 than the lower end of the left rear column 37. In this modified example 8, the load transfer member 60 can transfer the lateral load F applied to the upper part of the cab 30 from the left side to the side platform 23B of the upper frame 20 via the lower wall portion 30U.

[0096] In variations 4 to 8, the side platform 23B, which includes the platform body 231 and multiple supports 232, is an example of a partial skeletal component constituting the upper frame 20. In variations 4 to 8, the side platform 23B may also be omitted. Figures 6 to 9 The connectors 22 are represented respectively.

[0097] [Second Embodiment]

[0098] Figure 17 This is a perspective view showing a portion of the cab 30 and upper frame 20 of the hydraulic excavator 10 according to the second embodiment. Figure 18 This is a side view showing the right wall portion 30R of the cab 30 and the load transfer member 70R. Figure 19 This is a perspective view showing the left wall portion 30L of the cab 30 and the load transfer component 70L. Figure 20 This is a side view showing the left wall portion 30L and the load transfer member 70L.

[0099] The hydraulic excavator 10 according to the second embodiment has load transmission components 70R and 70L in the cab 30, which is consistent with... Figures 1 to 6 The hydraulic excavator 10 described in the first embodiment differs from the hydraulic excavator 10 described in the second embodiment. Other structural features of the hydraulic excavator 10 in the second embodiment are also different. Figures 1 to 6 The first embodiment shown is the same.

[0100] like Figure 18 As shown, the right wall portion 30R is located on the right side of the interior space and is arranged to rise upwards from the side platform 23B of the frame body 23 of the upper frame 20, thereby forming the right side of the cab 30. The right wall portion 30R is an example of a specific wall portion. The right wall portion 30R has a right panel 56. The right panel 56 is arranged to cover at least a portion of the area surrounded by the right front pillar 36, the right upper beam 43, the right rear pillar 38, and the right lower frame 34. The right panel 56 has an opening in its upper part. This opening of the right panel 56 constitutes a right window 55. The right panel 56 has a window sill defining the right window 55. Window glass is installed on this window sill. The right window 55 is an example of a side window.

[0101] The right plate 56 of the right wall portion 30R has a side edge, namely the wall side edge E2, located at the rear end of the right wall portion 30R in the width direction, i.e., the wall width direction W2, and extending longitudinally. The wall width direction W2 of the right wall portion 30R is the front-to-back direction. The extending direction of the wall side edge E2, i.e., the longitudinal direction, can be the vertical direction or an inclined direction relative to the vertical direction. Furthermore, the wall side edge E2 can extend from the upper end to the lower end of the right wall portion 30R while changing the extending direction of the wall side edge E2, and the longitudinal direction also includes such a concept.

[0102] The window edge of the right wall portion 30R includes an upper edge S11, a lower edge S12, a front edge S13, and a rear edge S14. The rear edge S14 is an example of a longitudinal edge. The rear edge S14 is an edge extending in the direction along the side edge E2 of the right wall portion 30R, and the lower edge S12 is an edge extending in the direction intersecting the extending direction of the rear edge S14. The window edge of the right wall portion 30R also includes: a lower rear corner C11 connecting the rear edge S14 and the lower edge S12; a lower front corner C12 connecting the front edge S13 and the lower edge S12; a higher rear corner C13 connecting the rear edge S14 and the upper edge S11; and a higher front corner C14 connecting the front edge S13 and the upper edge S11. The lower rear corner C11 is an example of a lower corner.

[0103] The upper part S11 and the lower part S12 are arranged at intervals in the vertical direction. The upper part S11 extends in the front-to-back direction. Figure 18 In the specific example shown, the lower edge S12 has a concave-convex shape that extends forward while its position varies vertically between the rear lower corner C11 and the front lower corner C12. However, the shape of the lower edge S12 is not limited to this specific example; it can also be, for example, a shape that extends in a straight line both front and back. The front edge S13 is located on the front side relative to the upper edge S11 and the lower edge S12 and extends longitudinally. The rear edge S14 is located on the rear side relative to the upper edge S11 and the lower edge S12 and extends longitudinally. Figure 18 In the specific example shown, the longitudinal direction of the extension of the front S13 is inclined relative to the vertical direction, and the longitudinal direction of the extension of the rear S14 is vertical. However, the longitudinal direction of the extension of the front S13 can also be vertical, and the longitudinal direction of the extension of the rear S14 can also be inclined relative to the vertical direction.

[0104] like Figure 20 As shown, the left wall portion 30L is located on the left side of the interior space and is arranged to rise upwards from the side platform 23B of the frame body 23 of the upper frame 20, thereby forming the left side of the cab 30. The left wall portion 30L is an example of a specific wall portion. The left wall portion 30L has an opening and closing door 50 and a left rear panel 57. The opening and closing door 50 is arranged to cover the area between the left front pillar 35 and the left center pillar 44, i.e., the front area. The left rear panel 57 is arranged to cover at least a portion of the area between the left center pillar 44 and the left rear pillar 37, i.e., the rear area. The left rear panel 57 has an opening in its upper part. This opening in the left rear panel 57 constitutes a left rear window 58 (left window). The left rear panel 57 has a window sill defining the left rear window 58. Window glass is installed on this window sill. The left rear window 58 is an example of a side window.

[0105] The left rear plate 57 of the left wall portion 30L has a width direction, i.e., the wall width direction W3, located in the width direction of the left wall portion 30L (see reference). Figure 20The rear end of the left wall portion 30L and the longitudinally extending side edge, namely the wall side edge E3. The wall width direction W3 of the left wall portion 30L is the front-to-back direction. The extending direction of the wall side edge E3, that is, the longitudinal direction, can be the vertical direction or a direction inclined relative to the vertical direction. In addition, the wall side edge E3 can extend from the upper end to the lower end of the left wall portion 30L while changing the extending direction of the wall side edge E3, and the longitudinal direction also includes such a concept.

[0106] The window edge of the left rear panel 57 includes an upper edge S11, a lower edge S12, a front edge S13, and a rear edge S14. The rear edge S14 is an example of a longitudinal edge. The rear edge S14 extends in the direction of the side edge E3 of the left wall portion 30L, and the lower edge S12 extends in the direction intersecting the extending direction of the rear edge S14. The window edge of the left wall portion 30L also includes: a lower rear corner C11 connecting the rear edge S14 and the lower edge S12; a lower front corner C12 connecting the front edge S13 and the lower edge S12; a higher rear corner C13 connecting the rear edge S14 and the upper edge S11; and a higher front corner C14 connecting the front edge S13 and the upper edge S11. The lower rear corner C11 is an example of a lower corner.

[0107] The upper part S11 and the lower part S12 are arranged at intervals in the vertical direction. The upper part S11 extends in the front-to-back direction. Figure 20 In the specific example shown, the lower edge S12 extends from the rear lower corner C11 to the front lower corner C12 in a posture that is lower at the front and higher at the back. That is, the lower edge S12 is inclined relative to the horizontal plane in a way that it shifts downward as it extends from the rear lower corner C11 to the front lower corner C12. However, the shape of the lower edge S12 is not limited to this specific example; it can also be, for example, a shape that extends horizontally in a straight line at both ends, or as shown in the example. Figure 18 The lower edge S12 of the window edge on the right wall portion 30R shown has a concave-convex shape. The front edge S13 is located at the front relative to the upper edge S11 and the lower edge S12 and extends longitudinally. The rear edge S14 is located at the rear relative to the upper edge S11 and the lower edge S12 and extends longitudinally. Figure 20 In the specific example shown, the longitudinal extensions of the front S13 and the rear S14 are in the vertical direction. However, these longitudinal extensions can also be in a direction inclined relative to the vertical direction.

[0108] The load transfer member 70R on the right side is fixed to at least one of the right plate 56 of the right wall portion 30R, the first right rear pillar 38, the second right rear pillar 39, and the lower part of the cab 30. The load transfer member 70L on the left side is fixed to at least one of the left rear plate 57 of the left wall portion 30L, the left rear pillar 37, and the lower part of the cab 30. The load transfer member 70R on the right side has an upper pillar portion 74R, a middle portion 72R, and a beam portion 75R. The load transfer member 70L on the left side has an upper pillar portion 74L, a middle portion 72L, and a beam portion 75L.

[0109] like Figure 18 As shown, the upper column portion 74R of the load-transferring member 70R on the right side is the portion extending downward from the upper part of the right wall portion 30R along the rear side S14 (outer side in the wall width direction W2) of the window edge of the right wall portion 30R. The middle portion 72R extends from above the rear lower corner portion C11 and to below the rear lower corner portion C11 and to the front side of the rear lower corner portion C11 (inner side in the wall width direction W2), i.e., the upper rear position, avoiding the right window 55. The beam portion 75R extends from the middle portion 72R away from the side edge E2 of the wall portion. Specifically, the beam portion 75R extends from the front end of the middle portion 72R towards the side platform 23B that constitutes part of the upper frame 20, below the right window 55, with a lower front and higher rear. The side platform 23B is an example of a partial skeletal component that forms part of the upper frame 20.

[0110] like Figure 19 and Figure 20 As shown, the upper column portion 74L of the load-transferring member 70L on the left side is the portion extending downward from the upper part of the left wall portion 30L along the rear side S14 (outer side in the wall width direction W3) of the window edge of the left wall portion 30L. The middle portion 72L is the portion extending from above the lower rear corner portion C11 and behind the lower rear corner portion C11 (outer side in the wall width direction W3), i.e., the upper rear position, to below the lower rear corner portion C11 and in front of the lower rear corner portion C11 (inner side in the wall width direction W3), i.e., the lower front position, in a manner that avoids the left rear window 58. The beam portion 75L is the portion extending from the middle portion 72L away from the side edge E3 of the wall portion. Specifically, the beam portion 75L is the portion extending from the front end of the middle portion 72L, i.e., the front end, toward the side platform 23B that constitutes part of the upper frame 20, below the left rear window 58, with a lower front and higher rear. The side platform 23B is an example of a partial skeletal component that forms part of the upper frame 20.

[0111] In this embodiment, the load transfer member 70R on the right is formed entirely of a single component, and the load transfer member 70L on the left is also formed entirely of a single component. In other words, the load transfer members 70R and 70L are not formed by connecting multiple components through welding. Therefore, the load transfer member 70R on the right has no welded portion on the middle portion 72R of the lower rear corner C11 near the window edge of the right wall portion 30R. Similarly, the load transfer member 70L on the left has no welded portion on the middle portion 72L of the lower rear corner C11 near the window edge of the left wall portion 30L.

[0112] The upper column portion 74R, the middle portion 72R, and the beam portion 75R of the load transfer member 70R are sequentially arranged so that the rear load F1 applied to the upper part of the cab 30 from the rear can be transferred to the side platform 23B of the upper frame 20. Similarly, the upper column portion 74L, the middle portion 72L, and the beam portion 75L of the load transfer member 70L are sequentially arranged so that the rear load F1 applied to the upper part of the cab 30 from the rear can be transferred to the side platform 23B of the upper frame 20.

[0113] The upper end 71R of the load transfer member 70R (the upper end 71R of the upper column 74R) is connected to at least one of the upper ends of the right upper beam 43 and the right rear column 38. The height position of the upper end 71R of the load transfer member 70R coincides with or is near the height position of the rear load F1 borne by the upper part of the cab 30 from the rear side when the hydraulic excavator 10, for example, rolls over.

[0114] The upper pillar portion 74R is located in front of the right rear pillar 38 and extends downward along the right rear pillar 38 when adjacent to it. In a side view, the upper pillar portion 74R is positioned between the right rear pillar 38 and the rear edge S14 of the window frame. In this embodiment, the upper end portion 71R of the load transfer member 70R is positioned above the rear upper corner portion C13, but it may also be positioned below the rear upper corner portion C13. The upper end portion 71R of the load transfer member 70R is positioned rearward relative to the rear upper corner portion C13. Furthermore, in the second embodiment, the second right rear pillar 39 of the first embodiment may be omitted or may be included.

[0115] The intermediate portion 72R of the load transfer member 70R has a portion that bends away from the side edge E2 of the wall as it extends downward. In a side view, the intermediate portion 72R has a portion that bends and extends outward from the rear lower corner C11 in a manner that avoids the rear lower corner C11. In a side view, the intermediate portion 72R has a portion that bends to cover the outer side of the rear lower corner C11.

[0116] The beam portion 75R of the load transfer member 70R has a shape that extends linearly toward the side platform 23B of the upper frame 20 as it moves downward away from the side edge E2 of the wall portion. In other words, the beam portion 75R has a shape that extends linearly toward the lower part of the cab 30 as it moves downward as it extends forward from the front end (lower end) of the middle portion 72R. By having a linear shape with the beam portion 75R sloping downward at the front and upward at the rear, the radius of curvature of the curved portion of the middle portion 72R can be reduced to a smaller size, allowing the middle portion 72R to be formed into a gently curved shape.

[0117] The lower end 73R of the beam 75R, which is also the lower end 73R of the load transfer member 70R, is connected to the lower part of the cab 30, specifically the lower right frame 34. Thus, the load transfer member 70R can transfer the rear load F1 applied to the upper part of the cab 30 from the rear to the side platform 23B via the lower right frame 34.

[0118] The structure of the load transfer member 70L on the left side is the same as that of the load transfer member 70R on the right side described above. Specifically, the upper end 71L (the upper end 71L of the upper column 74L) of the load transfer member 70L is connected to at least one of the upper ends of the left upper beam 42 and the left rear column 37. The height of the upper end 71L of the load transfer member 70L coincides with or is near the height of the rear load F1 borne by the upper part of the cab 30 from the rear when the hydraulic excavator 10, for example, rolls over.

[0119] The upper pillar portion 74L is located in front of the left rear pillar 37, extending downward along the upper part of the left rear pillar 37 when adjacent to it. In a side view, the upper pillar portion 74L is positioned between the left rear pillar 37 and the rear edge S14 of the window sill. In this embodiment, the upper end portion 71L of the load transfer member 70L is positioned above the rear upper corner portion C13, but it may also be positioned below the rear upper corner portion C13. The upper end portion 71L of the load transfer member 70L is positioned rearward relative to the rear upper corner portion C13.

[0120] The intermediate portion 72L of the load transfer member 70L has a portion that bends away from the side edge E3 of the wall as it extends downward. In a side view, the intermediate portion 72L has a portion that bends and extends outward from the rear lower corner C11 in a manner that avoids the rear lower corner C11. In a side view, the intermediate portion 72L has a portion that bends to cover the outer side of the rear lower corner C11.

[0121] The beam portion 75L of the load-transfer member 70L has a shape that extends linearly toward the side platform 23B of the upper frame 20 as it moves downward away from the side edge E3 of the wall portion. In other words, the beam portion 75L has a shape that extends linearly toward the lower part of the cab 30 as it moves downward as it extends forward from the front end (lower end) of the middle portion 72L. By having a linear shape with the beam portion 75L sloping downward at the front and upward at the rear, the radius of curvature of the curved portion of the middle portion 72L can be reduced to a smaller size, allowing the middle portion 72L to be formed into a gently curved shape.

[0122] The lower end 73L of the beam 75L, which is also the lower end 73L of the load transfer member 70L, is connected to the lower part of the cab 30, specifically the lower left frame 33. Thus, the load transfer member 70L can transfer the rear load F1 applied to the upper part of the cab 30 from the rear to the side platform 23B via the lower left frame 33.

[0123] like Figure 19 and Figure 20 As shown, the lower end 73L of the load transfer member 70L is connected to the lower left frame 33 at the front side of the left center column 44. In the second embodiment, the left center column 44 includes a column body 44A and a lower column portion 44B. The column body 44A extends downward from the upper left beam 42 to the beam portion 75L of the load transfer member 70L, and the lower column portion 44B extends downward from the beam portion 75L of the load transfer member 70L to the lower left frame 33. The lower end of the column body 44A is connected to the upper side of the beam portion 75L of the load transfer member 70L by, for example, welding, and the upper end of the lower column portion 44B is connected to the lower side of the beam portion 75L of the load transfer member 70L by, for example, welding.

[0124] [Modifications of the second embodiment]

[0125] The above describes the engineering machinery according to the second embodiment of the present invention. However, the present invention is not limited to the above-described solution and includes, for example, the following variations.

[0126] In the second embodiment, one of the load transfer member 70R on the right and the load transfer member 70L on the left can be omitted.

[0127] like Figure 17 and Figure 19 As shown, the hydraulic excavator according to the second embodiment has the same load transmission member 60 as the load transmission member 60 in the first embodiment. However, in this second embodiment, the load transmission member 60 may be omitted.

[0128] The lower end 73L of the load transfer member 70L on the left can also be connected to the lower left frame 33 at the rear of the left middle column 44.

[0129] Alternatively, at least one of the lower end 73R of the load transfer member 70R and the lower end 73L of the load transfer member 70L can be connected to the lower wall portion 30U (the floor surface of the lower wall portion 30U).

[0130] The column body 44A and the column lower part 44B can also be omitted. That is, the left middle column 44 can also include the column body 44A of the beam 75L extending from the upper left beam 42 to the load transfer member 70L, but not the column lower part 44B.

[0131] In addition, the left center column 44 can also be a component that extends uninterruptedly from the left upper beam 42 to the left lower frame 33. In this case, the beam portion 75L of the load transfer component 70L can also include a portion extending from the middle portion 72L to the rear side of the left center column 44 and a portion extending from the front side of the left center column 44 to the left lower frame 33 or the lower wall portion 30U.

[0132] Furthermore, the left center column 44 can also be a member that extends uninterruptedly from the upper left beam 42 to the lower left frame 33, and the beam portion 75L of the load transfer member 70L can also extend uninterruptedly from the middle portion 72L to the lower left frame 33 or the lower wall portion 30U. In this case, the beam portion 75L of the load transfer member 70L is positioned offset to the right or left relative to the left center column 44.

[0133] In the first embodiment, the upper column portion 64 of the load transfer member 60 is located inside (on the right side) of the left rear column 37 (an example of a rear column) in the wall width direction W1, and extends downward along the rear column 37 when adjacent to it, but is not limited to this arrangement. The upper column portion 64 of the load transfer member 60 may also be located, for example, on the front side of the rear column 37, and extend downward along the rear column 37 when adjacent to it.

[0134] In the second embodiment, the upper column portion 74R of the load transfer member 70R is located in front of the right rear column 38 (an example of a rear column), and extends downward along the right rear column 38 when adjacent to it, but is not limited to this arrangement. The upper column portion 74R of the load transfer member 70R may also be located, for example, to the left or right of the right rear column 38, and extends downward along the right rear column 38 when adjacent to it. Furthermore, in the second embodiment, the upper column portion 74L of the load transfer member 70L is located in front of the left rear column 37 (an example of a rear column), and extends downward along the left rear column 37 when adjacent to it, but is not limited to this arrangement. The upper column portion 74L of the load transfer member 70L may also be located to the right or left of the left rear column 37, and extends downward along the upper part of the left rear column 37 when adjacent to it.

[0135] According to the present invention, it is possible to provide an engineering machine that can both ensure visibility through the windows in the wall and suppress breakage near the corner, thereby suppressing the decrease in rigidity of the cab.

[0136] The provided engineering machinery includes: an upper frame supported by a lower walking body; and a cab, a box having a defined interior space and supported by the upper frame; wherein the cab includes: a plurality of walls surrounding the interior space front-to-back and left-to-right; and a load-transfer member disposed along any one of the plurality of walls, i.e., a specific wall, the specific wall having: a wall side edge, which is a longitudinally extending side edge located at the end of the width direction of the specific wall; and a window edge defining a window disposed on the inner side of the wall side edge in the width direction, the window edge comprising: a longitudinal edge extending in the direction along the wall side edge; a lower edge extending in a direction intersecting the extension direction of the longitudinal edge; and a lower corner portion, which... The load-transferring member, connected to the longitudinal side and the lower side, comprises: an upper column portion extending downward from the upper part of the specific wall portion along the longitudinal side on the outer side of the longitudinal side of the window edge in the wall width direction; a middle portion extending from above the lower corner portion and on the outer side of the lower corner portion in the wall width direction, avoiding the window, to below the lower corner portion and on the inner side of the lower corner portion in the wall width direction; and a beam portion extending below the window from the middle portion away from the side edge of the wall portion, the upper column portion, the middle portion, and the beam portion being continuous in this order so as to transfer the load applied to the upper part of the cab in the direction along the specific wall portion to the upper frame, wherein at least the middle portion of the load-transferring member is formed by a single component.

[0137] In this construction machinery, the upper column, middle section, and beam section of the load transfer member are arranged to avoid the window as described above, thus ensuring the operator's visibility through the window during operation. The beam section of the load transfer member extends from the middle section away from the side edge of the wall, thus allowing the load to be transferred directly or indirectly to the upper frame at a position away from the upper part of the cab where the load is applied, in the wall width direction. The load transfer member including such a beam section acts like a support rod that effectively suppresses deformation of a specific wall section caused by the load. The middle section of the load transfer member extends from above the lower corner and outward in the wall width direction (i.e., the outer upper position) to below the lower corner and inward in the wall width direction (i.e., the inner lower position), thus located near the lower corner edge of the window (corner proximal position). At least the middle section of the load transfer member is formed by a single component. That is, the load transfer member does not have welded parts at the corner proximal position. Therefore, even when a load is applied to the upper part of the cab along a specific wall direction, the load transfer member can prevent breakage at the middle section near the corner, and can transfer the load to the upper frame in the order of upper column, middle section, and beam section. Due to the high strength of the upper frame, it can withstand the load transferred via the load transfer member and support it. Thus, in this construction machinery, when the machinery is in operation, visibility can be ensured through the windows, and even when a load is applied to the upper part of the cab, breakage at the corner near the window edge can be prevented, thereby suppressing a decrease in cab rigidity. Furthermore, the middle section only needs to be continuous from the outer upper position to the inner lower position and formed by a single component; therefore, the present invention does not preclude the possibility of installing other auxiliary components on the middle section formed by such a single component by, for example, welding.

[0138] Ideally, in the aforementioned engineering machinery, the load-transfer component, including the upper column, the intermediate section, and the beam, is formed entirely from a single component. In this design, not only the intermediate section but also the entire load-transfer component is formed from a single component, rather than being formed by connecting multiple components through welding. Therefore, it is possible to suppress the occurrence of fractures caused by welded joints in the entire load-transfer component.

[0139] Ideally, the intermediate section of the construction machinery has a portion that curves downwards away from the side edge of the wall. In this configuration, the intermediate section with the curved portion undergoes smooth elastic deformation in the bending direction, thus achieving a spring effect. Consequently, when a load is applied to the upper part of the cab along a specific wall direction, the load-transferring member can effectively absorb a portion of the load's energy. Therefore, in this configuration, breakage at the intermediate section located near the corner can be further suppressed.

[0140] Ideally, in the construction machinery, the beam has a shape that extends linearly toward the upper frame as it shifts downward away from the side edge of the wall. In this design, the load can be transferred linearly and efficiently to the upper frame via the linearly extending beam.

[0141] In the aforementioned construction machinery, the load-transfer member may further include a lower column extending downward from the beam. In this embodiment, the rigidity of the load-transfer member is further enhanced by the addition of the lower column, thereby further improving the rigidity of the cab.

[0142] Ideally, the cab of the construction machinery further includes a rear pillar extending downward from the upper end of the specific wall portion along the side edge of the wall portion to the lower end of the specific wall portion, and the upper pillar portion of the load-transfer member extending downward along the rear pillar when adjacent to the rear pillar. In this embodiment, the load-transfer member configured along the specific wall portion is provided as a separate component from the rear pillar. Therefore, even when a load is applied to the upper part of the cab in the direction of the specific wall portion, the load-transfer member and the rear pillar can effectively suppress the deformation of the specific wall portion, thereby further improving the cab's rigidity against such load.

[0143] Ideally, in the construction machinery, the plurality of walls includes a rear wall located at the rear of the interior space, the specific wall being the rear wall, the window being the rear window, and the load-transfer member being arranged along the rear wall. In this configuration, even when a lateral load along the rear wall is applied to the upper part of the side of the cab where the upper column of the load-transfer member is located on the left and right sides, fracture at the middle part near the corner can be suppressed, thereby preventing a decrease in cab rigidity. An escape route is pre-set that allows the operator to escape from the cab via a path other than the side door in the event of a rollover. This escape route is, for example, set via the rear window of the cab. Since the upper column, middle part, and beam of the load-transfer member are arranged to avoid the rear window, an escape route can be ensured via the rear window even in the event of a rollover.

[0144] Ideally, the cab further includes a rear pillar extending downward from the upper end of the rear wall portion along the side edge of the wall portion to the lower end of the rear wall portion. The upper pillar portion of the load transfer member is located inside the rear pillar in the wall width direction and extends downward along the rear pillar when adjacent to it. In this configuration, the load transfer member, arranged along the rear wall portion, is provided as a separate component from the rear pillar. Therefore, even when a lateral load in the direction of the rear wall portion is applied to the upper part of the cab, the load transfer member and the rear pillar can effectively suppress deformation of a specific wall portion, thereby further improving the cab's lateral load resistance rigidity. Moreover, since the upper pillar portion of the load transfer member extends downward along the rear pillar when adjacent to it, inside the wall width direction of the rear pillar, the lateral load is efficiently transferred to the upper pillar portion of the load transfer member via the rear pillar.

[0145] Ideally, the upper frame has a side platform supporting the cab. The side platform includes a platform body and multiple supports supported by the platform body. These supports dampen the cab's vibrations. The lower end of the load-transfer member, viewed from above, is connected to the lower part of the cab at a position overlapping a pre-defined support among the multiple supports. In this configuration, because the lower end of the load-transfer member is positioned directly above the specific support of the upper frame, the load-transfer member can efficiently transfer the lateral load applied to the upper part of the cab to the specific support of the upper frame.

[0146] In the construction machinery, the plurality of walls may include a left wall located on the left side of the interior space and a right wall located on the right side of the interior space. A specific wall may be one of the left or right walls. The window may be a side window. The side edge of the wall may be a rear edge located at the rear end of the specific wall and extending longitudinally. The load-transferring member may be disposed along one of the wall sections. In this design, even when a rear load is applied to the upper part of the cab, fracture can be suppressed at the middle section near the corner, thereby suppressing a decrease in cab rigidity.

[0147] Ideally, the cab further includes a rear pillar extending downward from the upper end of the specific wall portion along the side edge of the wall portion to the lower end of the specific wall portion, with the upper pillar portion of the load transfer member located in front of the rear pillar and extending downward along the rear pillar when adjacent to it. In this configuration, the load transfer member, configured along one of the left and right wall portions, is provided as a different member from the rear pillar. Therefore, even when a rearward load is applied to the upper part of the cab along the direction of one of these wall portions, the load transfer member and the rear pillar can effectively suppress the deformation of one of the wall portions (the specific wall portion), thus further improving the cab's rearward load resistance rigidity. Moreover, since the upper pillar portion of the load transfer member extends downward along the rear pillar when adjacent to it in front of the rear pillar, the rearward load is efficiently transferred to the upper pillar portion of the load transfer member via the rear pillar.

[0148] Ideally, the cab further includes: a front pillar located in front of the side window and extending downward from the upper end of the specific wall portion to the lower end of the specific wall portion; and a center pillar located between the front pillar and the rear pillar and extending downward from the upper end of the specific wall portion, with the lower end of the load-transferring member connected to the lower part of the cab at a position in front of the center pillar. In this configuration, compared to the case where the lower end of the load-transferring member is connected to the lower part of the cab at a position behind the lower end of the center pillar, the load can be directly or indirectly transferred to the upper frame at a position further forward relative to the upper part of the cab to which a rearward load is applied. This further improves the cab's rigidity against rearward loads.

Claims

1. An engineering machinery, characterized in that... include: The upper skeleton is supported by the lower walking body; as well as, The driver's cab has a box-like structure defining its interior space and is supported by the aforementioned upper frame; wherein, The cab includes: a plurality of walls that surround the interior space front-to-back and side-to-side; a load-transfer member disposed along any one of the plurality of walls, i.e., a specific wall; and a rear pillar that extends downward from the upper end of the specific wall along the side edge of the wall to the lower end of the specific wall. The specific wall portion has: a wall portion side edge, which is a side edge extending longitudinally and located at the end of the specific wall portion in the width direction, i.e., the wall width direction; and a window edge, which is a window edge of the specific wall portion, defining a window disposed on the inner side of the wall portion side edge in the wall width direction. The window edge includes: a longitudinal edge extending along the side edge of the wall; a lower edge extending in a direction intersecting the extending direction of the longitudinal edge; and a lower corner connecting the longitudinal edge and the lower edge. The load-transferring member has: an upper column portion extending downward from the upper part of a specific wall portion along the longitudinal side of the window edge in the wall-width direction, and extending along the rear column when adjacent to it; a middle portion extending from above the lower corner portion and outside the lower corner portion in the wall-width direction, avoiding the window, to below the lower corner portion and inside the lower corner portion in the wall-width direction; and a beam portion extending below the window from the middle portion away from the side edge of the wall portion. The middle portion of the load transfer member has a portion that extends outward beyond the lower corner portion to avoid the lower corner portion of the window edge, and the upper column portion, the middle portion, and the beam portion are sequentially arranged in this order so as to transfer the load applied to the upper part of the cab in the direction along the particular wall portion to the upper frame, and at least the middle portion of the load transfer member is formed by a single component.

2. The engineering machinery according to claim 1, characterized in that: The load-transferring component, including the upper column, the middle section, and the beam, is formed entirely from a single component.

3. The engineering machinery according to claim 1 or 2, characterized in that: The middle portion has a portion that curves away from the side edge of the wall as it extends downwards.

4. The engineering machinery according to claim 1, characterized in that: The beam has a shape that extends in a straight line toward the upper frame as it moves downward away from the side edge of the wall.

5. The engineering machinery according to claim 1, characterized in that: The load-transferring member further includes a lower column portion extending downward from the beam portion.

6. The engineering machinery according to claim 1, characterized in that: The plurality of wall portions includes a rear wall portion located on the rear side of the interior space. The specific wall portion is the rear wall portion, and the window is the rear window. The load-transferring member is disposed along the rear wall portion.

7. The engineering machinery according to claim 6, characterized in that: The cab also includes a rear pillar extending downward from the upper end of the rear wall portion along the side edge of the wall portion to the lower end of the rear wall portion. The upper column portion of the load transfer member is located inside the rear column in the wall width direction and extends downward along the rear column when adjacent to it.

8. The engineering machinery according to claim 6 or 7, characterized in that: The upper frame has a side platform that supports the cab. The side platform includes a platform body and multiple supports supported by the platform body. The plurality of supports support the cab in a manner that can suppress vibrations in the cab. The lower end of the load transfer member, viewed from above, is connected to the lower part of the cab at a position overlapping with a pre-set support, i.e. a specific support, among the plurality of supports.

9. The engineering machinery according to claim 1, characterized in that: The plurality of wall portions include a left wall portion located on the left side of the interior space and a right wall portion located on the right side of the interior space. The specific wall portion is one of the left wall portion and the right wall portion, the window is a side window, and the side edge of the wall portion is a rear edge located at the rear end of the specific wall portion and extending along the longitudinal direction. The load-transferring member is disposed along one of the wall portions.

10. The engineering machinery according to claim 9, characterized in that: The cab further includes a rear pillar extending downward from the upper end of the specific wall portion along the side edge of the wall portion to the lower end of the specific wall portion. The upper column portion of the load transfer member is located in front of the rear column and extends downward along the rear column when adjacent to it.

11. The engineering machinery according to claim 10, characterized in that: The cab further includes: a front pillar located in front of the side window and extending downward from the upper end of the specific wall portion to the lower end of the specific wall portion; and a center pillar located between the front pillar and the rear pillar and extending downward from the upper end of the specific wall portion. The lower end of the load transfer component is connected to the lower part of the cab at the position in front of the center column.

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