JP2006015985A - Cabin of construction machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cabin of a construction machine capable of expanding the visibility from the inside of the cabin while suppressing deformation of the cabin when the construction machine is turned over, and reducing the weight. <P>SOLUTION: A center pillar 26, a left rear pillar 27 and a right rear pillar 28 are provided as components of a frame 21 forming a framework of a cabin. By integrally connecting upper ends of the pillars 26-28 to each other by a roof member 29 and first and second cross members 30, 31, a portal structure A having the overall shape of a substantially isosceles triangle in plan view is constituted at a rear part of the cabin. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a cabin of a construction machine such as a hydraulic excavator.

  An explanation will be given taking the cabin of a hydraulic excavator as an example.

  As shown in FIG. 17, the hydraulic excavator includes a crawler type lower traveling body 1, an upper swing body 2 mounted on the lower traveling body 1, and a work attachment 3 attached to the upper swing body 2. Then, the cabin 4 is provided on the upper swing body 2.

  Here, generally, the work attachment 3 is provided on the right side of the upper swing body 2 (the right side as viewed from the operator seated in the cabin 4; the same applies to the left and right and front and rear directions described below), and the cabin 4 is provided on the left side. On the left side surface of the cabin 4, an entrance that is opened and closed by the door 5 is provided.

  The cabin 4 is configured by attaching an exterior material (a plate material or a window glass) to a frame 6 as a framework shown in FIG.

  The frame 6 of the conventional cabin 4 includes front pillars 7 and 8 erected on the left and right sides of the front part, rear pillars 9 and 10 erected on the left and right sides of the rear part, and the front and rear pillars 7 and 9 on the left side. The center pillar 11 erected on the left side, the left roof member 12 spanned between the upper ends of the left front and rear pillars 7 and 9, and the span between the upper ends of the right front and rear pillars 8 and 10. Right roof member 13, upper front cross member 14 spanned between the upper ends of left and right front pillars 7, 8, lower front cross member 15 spanned between the lower ends, and left and right rear pillars 9, 10 and an upper rear cross member 16 that is bridged between the upper ends, and the joints of these constituent members are integrated by welding.

In general, the cabin frame
(A) The safety of the operator during a fall (rollover) is ensured (the operator's space is secured even if it is deformed by the left side load during the fall),
(B) It is required to satisfy the two conditions that the operator's field of view (especially forward field of view) is sufficiently secured during work.

  Here, in order to satisfy the condition (A), the frame needs to have sufficient strength and rigidity.

  On the other hand, in order to satisfy the condition (B), the amount of the structural member (especially the amount of the structural member on the front side) should be as small as possible and the cross-sectional size should be small so that the frame structural member does not hinder the field of view. It is desirable to do.

  In this respect, the strength / rigidity and visibility required for the frame are contradictory requirements.

  In response to such demands, in the conventional frame 6, the front-side portal structure is formed by the left and right front pillars 7 and 8 and the upper front cross member 14, and the rear side is formed by the left and right rear pillars 9 and 10 and the rear cross member 16. The front and rear portal structures are connected by the left and right roof members 12 and 13.

  Further, as shown in Patent Document 1, as a technique based on the same technical idea, there is also proposed a technique in which a connecting member is provided to disperse a load applied to the roof portion widely over the entire frame. .

  On the other hand, as another frame configuration, as shown in Patent Document 2, a structure in which a wide main pillar extending rearward and upward from an intermediate portion in the front-rear direction is provided on both left and right side surfaces, and Patent Document 3 shows. As described above, there has been proposed a configuration in which the gate-like structures on both the front and rear sides of the conventional frame 6 are connected to each other with a plate-like roof material.

Furthermore, as shown in Patent Document 4, a technique is also known in which center pillars are provided on both the left and right sides and the upper ends thereof are connected to form a portal structure at the center of the frame.
JP 2004-42739 A JP 2000-327462 A JP 2001-123482 A JP 2001-140283 A

  In the conventional frame configuration shown in FIG. 18 and the frame configuration of Patent Document 1, a lateral load applied to the left side surface portion during a fall or the like is transmitted to the front and rear portal structures and dispersed throughout the entire frame. It will be received evenly by the member.

  However, according to the frame configuration in which all the constituent members function as load supporting members in this way, uniform strength and rigidity are required for all the constituent members. Accordingly, the left and right front pillars 7 and 8 and the upper front cross member 14 positioned in the front field of view must have the same cross-sectional size as the other components, which is sufficient for the demand to improve the front field of view. I can't respond.

  Further, according to the technique of Patent Document 2, although the side field of view expands because the main pillar is tilted backward, the lateral load applied to the intermediate portion in the front-rear direction of the roof portion concentrates on the roof member, which greatly deforms. Since it becomes easy, there is a problem in terms of ensuring the safety of the operator.

  On the other hand, in the technique of Patent Document 3, although the lateral load resistance of the roof portion is increased, the frame weight is increased as an adverse effect, which is contrary to another request for weight reduction.

  Furthermore, according to the technique of Patent Document 4, since the cross-sectional sizes of the left and right center pillars constituting the portal structure are increased, the left and right side fields of view are greatly narrowed.

  Therefore, the present invention provides a construction machine cabin that simultaneously satisfies the two contradictory requirements of expanding the field of view while suppressing deformation during a fall or the like, and that can also achieve weight reduction.

  According to the first aspect of the present invention, as a structural element of a frame that is a framework, at least a center pillar that is positioned at an intermediate portion in the front-rear direction on one of the left and right sides, and a first side that is positioned at an interval between the front and rear sides of the center pillar A pillar and a second side pillar located on the opposite side to the first side pillar are provided in a state of being located at each vertex of the triangle in plan view, and the center pillar, both the first and second sides By connecting the upper ends of the pillars integrally with a connecting member, a gate-shaped structure whose outer shape is substantially triangular in plan view is configured.

  According to a second aspect of the present invention, in the configuration of the first aspect, as a connection member, a roof member between the upper ends of the center pillar and the first side pillar, a first cross member between the upper ends of the center pillar and the second side pillar, A second cross member is bridged between the upper ends of both side pillars in an integrated state.

  According to a third aspect of the present invention, in the configuration of the first aspect, a substantially triangular plate-like connecting member is provided integrally between the upper ends of the center pillar and the first and second side pillars. is there.

  According to a fourth aspect of the present invention, in the configuration of the first aspect, a flat box-shaped connecting member having a substantially triangular shape in plan view is provided in an integrated state across the upper ends of the center pillar and the first and second side pillars. It is what was done.

  According to a fifth aspect of the present invention, in the configuration according to any one of the first to fourth aspects, a center pillar and a first side pillar are provided on the entrance / exit side, and a second side pillar is provided on the opposite side.

  The invention of claim 6 is the structure according to any one of claims 1 to 5, wherein the second side pillar is provided on the opposite side of the center pillar and the first side pillar at an intermediate position in the front-rear direction. is there.

  According to a seventh aspect of the present invention, in the configuration of the sixth aspect, the second side pillar is located between the center pillar and the first side pillar so that the planar shape of the gate-shaped structure is substantially an isosceles triangle. It is provided on the opposite side.

  The invention according to claim 8 is the structure according to any one of claims 1 to 5, wherein the second side pillar is provided on the opposite side to the center pillar at the same position in the front-rear direction.

  According to a ninth aspect of the present invention, in the configuration of any of the first to fifth aspects, the second side pillar is provided on the opposite side of the first side pillar at the same position in the front-rear direction.

  According to a tenth aspect of the present invention, in the configuration according to any one of the first to ninth aspects, the left and right rear pillars as the first side pillars are located behind the center pillar, and the other as the second side pillar is located at the rear side opposite to the left and right sides. The rear pillars are respectively provided, and these form a portal structure at the rear of the cabin.

  According to an eleventh aspect of the present invention, in the configuration of any one of the first to ninth aspects, a front pillar as a first side pillar is disposed in front of the center pillar, and a second side pillar is disposed on the opposite side to the rear side of the front pillar. The rear pillars are respectively provided, and a portal structure is constituted by these.

  According to a twelfth aspect of the present invention, in the configuration of any one of the first to eleventh aspects, a third side pillar is provided on the left and right sides of the first side pillar or the second side pillar, and the third side pillar and the center pillar are Two portal structures whose outer shapes are substantially triangular in plan view are adjacent to each other by connecting the upper ends and the upper ends of the third side pillar and the second side pillar integrally with each other by an additional connecting member. It is configured as follows.

  According to the present invention, the side load applied to the frame due to falling or the like is concentratedly received by the portal structure formed in the front part or the rear part of the cabin, so other parts are required to have high strength and high rigidity. Not.

  Accordingly, it is possible to reduce the amount of the constituent material in other portions and reduce the cross-sectional size.

  In addition, this portal structure is formed in a substantially triangular shape in plan view by connecting the upper ends of the three pillars arranged asymmetrically with connecting members, so that the entire structure has high strength and high rigidity. Thus, it exhibits high load bearing performance and is particularly excellent in terms of torsional load resistance.

  In other words, it is possible to obtain a gate-shaped structure that has sufficient load bearing capacity and is difficult to deform. By receiving loads intensively with this portal-shaped structure, the basic purpose of protecting the driver by suppressing the deformation of the cabin While achieving the above, it is possible to widen the field of view and reduce the weight.

  Further, as shown in the case where a center pillar having a large cross-sectional size is provided on both the left and right sides and the upper ends thereof are connected to form a portal structure at the center of the frame (the technology of Patent Literature 4), Since this does not appear, it is advantageous in terms of design.

  In this case, according to the invention of claim 2, since the roof member and the cross member, which are frame members, are used as the connecting members, the entire structure can be lightened, which is particularly advantageous in terms of reducing the weight of the cabin.

  On the other hand, according to the inventions of claims 3 and 4, since the substantially triangular plate-shaped or flat box-shaped connecting member is used, the integral strength of the gate-shaped structure can be increased and the assembly is easy. It becomes. In particular, according to the invention of claim 4, since the connecting member can be made in a box shape, its rigidity and strength can be further increased, so that the deformation of the connecting member itself is suppressed and the integral strength of the portal structure is further increased. Can do.

  In the present invention, the portal structure is formed by disposing the center pillar, the first and second side pillars at the apexes of the triangle in plan view, and connecting these upper ends with connecting members. What is necessary is just to comprise so that a shape may become a substantially triangle by planar view. In other words, the ceiling portion itself of the gate-shaped structure formed by the connecting members does not necessarily have a substantially triangular shape in plan view. For example, when a frame material is used as the connecting member, some connecting members are bent into a U-shape or the like. The planar shape of the ceiling portion may be a non-triangle.

  By the way, when the machine falls down, the side surface portion on the entrance / exit side is down, and there is a high possibility that the lower side surface portion receives a direct load.

  In this respect, according to the invention of claim 5, the center pillar is arranged on the entrance / exit side, so that the load can be reliably transmitted to the entire gate-shaped structure and the deformation suppressing action can be secured.

  According to the inventions of claims 6 and 7, since the planar shape of the portal structure is a non-right triangle, the torsional rigidity is increased and the deformation suppressing effect is high as compared with the case of a right triangle.

  In particular, according to the invention of claim 7 in which the planar shape is a substantially isosceles triangle, the torsional rigidity is the largest among the triangles, and the portal structure is most difficult to deform. For this reason, the objective of driver | operator protection can be achieved more reliably.

  Even when the components are arranged so that the planar shape of the portal structure is a substantially triangular shape other than a substantially isosceles triangle (claims 8 and 9), the load is basically transmitted by a substantially triangular shape. Features that are easy and difficult to deform are utilized.

  On the other hand, according to the invention of claim 10, since the gate-shaped structure having a substantially triangular shape in a plan view is formed at the rear part of the cabin, it is possible to widen the forward field of view which is important at the time of work, and there is a great benefit in improving visibility.

  On the other hand, according to the invention of claim 11, since the portal structure is formed in front of the case of claim 10, the cabin configuration in which it is desired to secure a space in the front half of the cabin (emphasizing driver's protection) is provided. While advantageous when taking, it is easy to secure a living space in the rear half of the cabin. In addition, the visibility of the rear can be improved.

  Further, according to the invention of claim 12, since the two gate-shaped structures having a substantially triangular shape in plan view are formed adjacent to each other, it is advantageous when importance is attached to the load supporting performance (deformation suppressing effect).

1st Embodiment (refer FIGS. 1-5)
The cabin frame 21 according to the first embodiment includes left and right front pillars 22 and 23, upper and lower front cross members 24 and 25, and a center pillar 26 erected in the middle in the front-rear direction on the doorway side (left side). And rear pillars (first and second side pillars) 27 and 28 erected on both the left and right sides of the rear part.

  In addition, the center pillar 26 may be provided in the center part of the front-back direction of the left side, and may be provided in the position shifted | deviated to either front or back rather than the center part.

  The center pillar 26 and the left and right rear pillars 27 and 28 are provided in a state of being positioned at each vertex of the triangle in plan view, and a left rear roof member 29 as a connecting member is provided between the center pillar 26 and the upper end of the left rear pillar 27. In addition, the first and second cross members 30 and 31 as connecting members are bridged in an integrated state between the upper ends of the center and the rear pillars 26, 27 and 28 in a V-shaped arrangement.

  In this way, the portal structure A is formed in which the outer shape of the pillars 26 to 28 arranged in an asymmetrical manner at the rear end of the cabin is connected and integrated with each other at the upper ends of each of the cabins, and the outer shape is substantially triangular in plan view. .

  Here, the right rear pillar 28 is arranged at the center position in the front-rear direction between the center pillar 26 and the left rear pillar 27, and the planar shape of the gate structure A is an isosceles triangle (see FIG. 2).

  Note that a left front roof member 32 is bridged between the upper ends of the left rear roof member 29 and the left front pillar 22, and a right roof member 33 is bridged between the upper ends of the right rear pillar 28 and the right front pillar 23.

  In addition, the members constituting the frame 21 including the constituent members of the gate-shaped structure A are integrated by welding at the joint portions.

  According to this frame configuration, a lateral load (indicated by a double arrow in FIG. 2) applied to the left side intermediate portion of the frame 21 due to a fall or the like is transmitted to the center pillar 26, and from here through the first cross member 30. The information is transmitted to the right rear pillar 28 and further to the left rear pillar 27 through the second cross member 31.

  That is, a side load is received intensively by the portal structure A, and the entire structure A is deformed.

  Therefore, the front structural members (left front and right roof members 32 and 33, left and right front pillars 22 and 23, and upper and lower front cross members 24 and 25) unrelated to the portal structure A almost share the load. Without high strength and high rigidity.

  For this reason, the front-side components can be minimized as shown in the drawing, and the cross-sectional size thereof can be small.

  Thereby, as shown in FIG. 2, it becomes possible to maximize the front view and the side view required at the time of work.

  In FIG. 2, the viewing area that can be seen by the operator in the cabin without being obstructed by the constituent members is indicated by hatching. In the figure, reference numeral 3 denotes a work attachment (see FIG. 17) attached to the right side of the cabin.

  In addition, the entire frame 21 can be reduced in weight by reducing the amount of each front-side component member and reducing the cross-sectional size.

  Regarding the weight reduction, FIG. 3 shows a weight comparison between the conventional cabin (frame 6) shown in FIG. 18 and the cabin (frame 21) according to the first embodiment.

  As can be seen from the figure, according to the cabin of the first embodiment, the weight can be reduced to about 20% of the conventional cabin.

  4 (a) to 4 (c) show other examples of the arrangement of the front constituent members. FIG. 4 (a) shows an example in which the right front pillar 23 and the lower front cross member 25 of the first embodiment are omitted. ) Is an example in which the left front pillar 22 and the lower front cross member 25 are omitted, and (c) is an example in which the upper front cross member 24 is omitted.

  Thus, it becomes possible to select the arrangement pattern of each front-side component member from a wide range of options from the viewpoint of expanding the view and reducing the weight.

  Moreover, the gate-shaped structure A that receives loads intensively has three pillars (center and left and right rear pillars 26 to 28) arranged asymmetrically on the left and right at the upper ends of the left rear roof and both cross members 29 to 31. Therefore, the load transmission performance is good and the strength of each member is utilized to the maximum, so that high load supporting performance (particularly torsional rigidity) can be obtained as a whole.

  In particular, in the first embodiment, the planar shape of the gate-shaped structure A is a substantially isosceles triangle, so that the torsional rigidity is the largest among the triangles and is most difficult to deform.

  Regarding the load support performance of the portal structure A according to the first embodiment, the amount of deformation when a lateral load is applied to the central portion of the left side surface portion as shown by the double line arrow in FIG. 2 was obtained by analysis. The results are shown in FIG.

  The figure shows the case where the deformed state of the gate-shaped structure A is viewed from the back, and each structural member (center and left and right rear pillars 26 to 28) of the gate-shaped structure A is deformed equally, The left and right front pillars 22 and 23 that are not constituent elements of the body A are hardly deformed, that is, the load is concentrated on the portal structure A, and the load is transmitted to each component of the portal structure A. It can be seen that the entire structure is deformed as a unit. In the figure, O indicates an operator in the cabin.

  In addition, according to the above-described frame configuration, the side pillars are conspicuous as compared to the case where center pillars having a large cross section are provided on both left and right sides to form a portal structure at the center of the frame as described in Patent Document 4. Since the protruding portion does not appear, it is advantageous in terms of design.

  In the first embodiment, the gate-shaped structure A includes a center pillar 26 and rear pillars (first and second side pillars) 27 and 28 arranged at respective vertex portions of a triangle in plan view, and upper end portions thereof. What is necessary is just to comprise so that an outer shape may become a substantially triangle by planar view by connecting each with each member 29,30,31 as a connection member. That is, the ceiling portion itself formed by the members 29 to 31 does not necessarily have a substantially triangular shape in a plan view. For example, the first cross member 30 or the second cross member 31 is bent not in a straight line but in the shape of a letter. As the shape, the outer shape of the ceiling portion may be formed in a non-triangular shape in plan view. This point is the same in other embodiments described below.

Other Embodiments Only differences from the first embodiment will be described.

  6 and 7 show two examples when the position of the right rear pillar 28 is changed in the front-rear direction.

  In the second embodiment of FIG. 6, the right rear pillar 28 is arranged at the same front-rear direction position as the center pillar 26 (intermediate portion of the cabin front-rear direction = front position when the right rear pillar position of the first embodiment is the center position). ing.

  On the other hand, in the third embodiment of FIG. 7, the right rear pillar 28 is disposed at the same front-rear direction position as the left rear pillar 27 (cabin rear end portion = same rear position).

  And in FIG. 8, the comparison result of the load support performance of the portal structure A concerning each 1st-3rd embodiment is shown.

  This is an analysis of the amount of displacement to the right side of the portal structure A when a lateral load is applied to the upper end of the center pillar 26. The first embodiment in which the right rear pillar 28 is provided at the center position. In this case, the amount of deformation can be minimized.

  However, it was simultaneously confirmed that both the second and third embodiments can exhibit high load performance close to that of the first embodiment.

  In the fourth embodiment shown in FIGS. 9 and 10, the back wall 34 is provided in the substantially lower half between the left and right rear pillars 27 and 28 on the premise of the frame configuration of the third embodiment in FIG.

  The back wall 34 may be formed only of a plate material, or reinforcing beam members 35 may be fixed to a plurality of upper and lower (or left and right) portions on the inner surface side as shown in the figure.

  By providing the back wall 34 in this manner, the load transmission performance between the left and right rear pillars 27 and 28 can be enhanced.

  FIG. 11 shows a fifth embodiment relating to the structure of the portal structure. In the fifth embodiment, when the left front pillar 22 and the left front roof member 32 can be configured as strength members, the upper ends of the right rear pillar 28 and the left front pillar 22 are the third cross members 36 as additional connecting members. By connecting together, another gate-shaped structure B is formed adjacent to the front of the gate-shaped structure A.

  According to the fifth embodiment, it is disadvantageous in terms of the forward field of view as compared with the case of the first embodiment, but since the load supporting force is strengthened, it is suitable when safety is important.

  In the sixth embodiment shown in FIG. 12, the left rear pillar 27 of the first embodiment is eliminated, while the left front pillar 22 is configured as a strength member, and the left front pillar 22 and the center pillar 26 are arranged between the upper end portions thereof. The first cross member 38 and the second cross member 39 are bridged between the upper ends of the roof member 37, the left front pillar 22 and the right rear pillar 28 in an integral manner between the upper ends of the center pillar 26 and the right rear pillar 28, respectively. The structure A is formed.

  According to the sixth embodiment, it is disadvantageous in terms of the forward field of view compared to the first to fourth embodiments, but it is desired to secure the space in the first half of the cabin when falling or the like (emphasizing the protection of the driver). While it is advantageous when the cabin configuration is adopted, it is easy to secure a living space in the rear half of the cabin. In addition, the visibility of the rear can be improved.

  Next, in the seventh embodiment shown in FIG. 13, straddling between the upper ends of the pillars 26 to 28 constituting the gate-shaped structure A while taking basically the same frame configuration as that of the first embodiment. A substantially triangular plate-shaped connecting member 40 is provided in an integrated state.

  According to this configuration, it is possible to increase the integrated strength of the portal structure A, and it is easy to assemble.

  In the eighth embodiment shown in FIGS. 14 and 15, a connecting member 41 formed in a flat box shape is provided instead of the plate-like connecting member 40 of the seventh embodiment.

  In this way, by using the box-shaped connecting member 41, the rigidity and strength thereof can be higher than in the case of a simple plate-like shape. The integral strength can be further increased.

  In the eighth embodiment, the planar shape of the connecting member 41 may be a substantially triangular shape, or a shape other than a substantially triangular shape, such as a shape close to a trapezoid having a side substantially parallel to the rear side on the front side as shown in the figure. It is good. This is the same as in the seventh embodiment.

  In the eighth embodiment, as a means for effectively increasing the rigidity and strength of the connecting member 41, a plurality of partition-like ribs 42 may be provided in the inner space of the connecting member 41 as shown in FIG. .

  In the ninth embodiment shown in FIG. 16, the left and right frame structure is opposite to that of the first embodiment. That is, the center pillar 26 is arranged on the right side, and the right rear roof member 43 and the first and second cross members 30, 31 are provided between the upper ends of the three pillars 26, 27, 28 including the center pillar 26. Structure A is configured. Reference numeral 44 denotes a right front roof member.

  This frame configuration is suitable when the cabin is arranged on the right side, the work attachment is arranged on the left side, and the cabin entrance is provided on the right side.

It is a perspective view which shows the frame structure of the cabin concerning 1st Embodiment of this invention. It is the same top view. It is a figure which shows the comparison result of the weight by the same embodiment and the conventional frame structure. (a) (b) (c) is a perspective view which shows the other example of arrangement | positioning of structural members other than the portal structure in the case of taking the frame structure of 1st Embodiment. It is the figure which looked at the deformation | transformation state by a side load in the frame structure of 1st Embodiment from the back. It is a perspective view which shows the frame structure of the cabin concerning 2nd Embodiment of this invention. It is a perspective view which shows the frame structure of the cabin concerning 3rd Embodiment of this invention. It is a figure which shows the displacement ratio by the flame | frame structure of each 1st-3rd embodiment of this invention. It is a perspective view which shows the frame structure of the cabin concerning 4th Embodiment of this invention. FIG. 10 is an enlarged sectional view taken along line XX in FIG. 9. It is a perspective view which shows the frame structure of the cabin concerning 5th Embodiment of this invention. It is a perspective view which shows the frame structure of the cabin concerning 6th Embodiment of this invention. It is a perspective view which shows the frame structure of the cabin concerning 7th Embodiment of this invention. It is a perspective view which shows the frame structure of the cabin concerning 8th Embodiment of this invention. It is the XV-XV line expanded sectional view of FIG. It is a perspective view which shows the frame structure of the cabin concerning 9th Embodiment of this invention. 1 is a schematic side view of a hydraulic excavator to which the present invention is applied. It is a perspective view which shows the frame structure of the conventional cabin.

Explanation of symbols

21 Frame A Gate-shaped structure 27 Left rear pillar as the first side pillar constituting the gate-shaped structure 28 Right rear pillar as the second side pillar 29 Left rear roof member 30, 31 Same cross member 32 Front left Roof member 33 Right roof member B Another gate-shaped structure 23 Right front pillar as a third side pillar 36 Third cross member as an additional connecting member 37 Left roof member as a connecting member 38,39 First as a connecting member First and second cross members 40 Triangular plate-like connecting member 41 Flat box-like connecting member having a substantially triangular shape in plan view 43 Right rear roof member as a connecting member when the gate-shaped structure is disposed upside down

Claims (12)

  As structural elements of the frame to be a framework, at least a center pillar positioned in the middle in the front-rear direction on one side of the left and right sides, a first side pillar positioned at an interval in the front-rear side of the center pillar, and the first side A second side pillar located on the opposite side to the pillar is provided in a state of being located at each vertex of the triangle in plan view, and the upper ends of the center pillar and the first and second side pillars are connected to each other. A cabin of a construction machine, characterized in that a gate-shaped structure whose outer shape is substantially triangular in plan view is configured by being integrally connected by members.   2. The cabin of a construction machine according to claim 1, wherein the connecting member includes a roof member between the upper ends of the center pillar and the first side pillar, a first cross member between the upper ends of the center pillar and the second side pillar, and both side pillars. A construction machine cabin characterized in that a second cross member is bridged in an integrated state between the upper ends of the two.   The cabin of a construction machine according to claim 1, wherein a substantially triangular plate-like connecting member is provided in an integrated state across the upper ends of the center pillar and the first and second side pillars. Construction machinery cabin.   The cabin of the construction machine according to claim 1, wherein a flat box-like connecting member having a substantially triangular shape in plan view is provided in an integrated state across the upper ends of the center pillar and the first and second side pillars. Construction machine cabin characterized by.   The construction machine cabin according to any one of claims 1 to 4, wherein a center pillar and a first side pillar are provided on the entrance / exit side, and a second side pillar is provided on the opposite side. cabin.   The cabin of a construction machine according to any one of claims 1 to 5, wherein the second side pillar is provided on the opposite side of the center pillar and the first side pillar at an intermediate position in the front-rear direction. Features a construction machine cabin.   The cabin of a construction machine according to claim 6, wherein the second side pillar is located at a center position in the front-rear direction between the center pillar and the first side pillar so that the planar shape of the portal structure is substantially an isosceles triangle. A construction machine cabin characterized by being provided on the opposite side.   The cabin according to any one of claims 1 to 5, wherein the second side pillar is provided on the opposite side to the center pillar at the same position in the front-rear direction.   The cabin of a construction machine according to any one of claims 1 to 5, wherein the second side pillar is provided on the opposite side of the first side pillar at the same position in the front-rear direction. cabin.   The cabin of a construction machine according to any one of claims 1 to 9, wherein one rear pillar as a first side pillar is provided behind the center pillar, and the other is provided as a second side pillar at a rear part opposite to the left and right sides. Each of the rear pillars is provided with a portal structure at the rear of the cabin.   The cabin of a construction machine according to any one of claims 1 to 9, wherein a front pillar serving as a first side pillar is disposed in front of the center pillar, and a second side pillar is disposed on the opposite side to the rear side of the front pillar. As a construction machine cabin, the rear pillars are respectively provided, and a portal structure is formed by these.   The cabin of a construction machine according to any one of claims 1 to 11, wherein a third side pillar is provided on the same left and right side as the first side pillar or the second side pillar, and the third side pillar and the center pillar Two portal structures whose outer shapes are substantially triangular in plan view are adjacent to each other by connecting the upper ends and the upper ends of the third side pillar and the second side pillar integrally with each other by an additional connecting member. Construction machine cabin characterized by being constructed as

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