JP6966946B2 - Cab structure of construction machinery - Google Patents

Description

The present invention relates to the cab structure of a construction machine such as a hydraulic excavator or a hydraulic crane, and in particular, the cab can be reinforced without sacrificing a living space for occupants, and the cab rigidity when the vehicle body rolls over is increased. Regarding the cab structure.

The cab structure of the construction machine must satisfy the "earthwork machine fall protection structure" (JISA8910) called ROPS (Roll Over Protective Structure) specified in ISO. ROPS is a standard for securing a living space for the driver in the cab when the construction machine rolls over and the cab is deformed. It simulates the load applied to the cab when the construction machine rolls over and the cab. A predetermined load is applied to the vehicle in the lateral direction (vehicle width direction), the vertical direction, and the front-rear direction, respectively, and it is inspected whether or not a living space is secured in the deformed cab.

In order to increase the rigidity of the cab so as to satisfy the ROPS, as shown in FIG. 8, as a cab structure of a conventional construction machine, a space is provided between the roof portion r and the floor portion f of the cab c in the vehicle width direction. It is known that a pillar (side pillar) p is bridged and a triangular plate-shaped reinforcing material (gusset plate) g is provided at the corner between the pillar p and the roof portion r and at the corner between the pillar p and the floor portion f. (See FIGS. 2 and 4 of Patent Document 1). The gusset plate g is provided at the four corners of the frame frame w composed of the roof portion r, the left and right pillars p, p, and the floor portion f when the cab c is viewed from the front.

Japanese Unexamined Patent Publication No. 10-266267

According to the conventional cab structure shown in FIG. 8, when a force F in the vehicle width direction is applied to the roof portion r of the cab c during the ROPS test, or the construction machine rolls over and the vehicle width is applied to the roof portion r of the cab c. When a force F in the direction is applied, the gusset plate g can suppress the situation where the frame frame w is crushed (squashed) into a parallel quadrilateral shape, that is, the matchbox deformation of the cab c can be suppressed. As a result, the deformation of the frame frame w of the cab c is suppressed to a range where it does not come into contact with the occupant D, and the safety of the occupant D is ensured.

However, since the triangular plate-shaped gusset plate g is attached to the inside of the four corners of the frame frame w of the cab c, the living space for the occupant D is narrowed by these gusset plates g, and a feeling of oppression is generated. It causes a decrease in comfort. In particular, the gusset plate g attached to the upper two corners (the corners of the roof portion r and the left and right pillars p) enters the viewing angle of the occupant D who looks around while driving or working, which is annoying and has a visibility. It can also be a hindrance, and it is also possible that it interferes with occupant D during the matchboxing transformation of cab c.

An object of the present invention, which was created in consideration of the above circumstances, is to provide a cab structure for a construction machine that can reinforce the cab without sacrificing a living space for occupants and increase the rigidity of the cab when the vehicle rolls over. To provide.

According to the present invention, which was devised to achieve the above-mentioned object, it is a cab structure of a construction machine in which a plurality of pillars are bridged between a roof portion and a floor portion of the cab, and among the plurality of pillars. , The lower ends of at least a pair of pillars spaced apart in the vehicle width direction are extended below the floor portion, and the construction machine rolls over to the extension portion below the floor portion of those pillars in the vehicle width direction. A reinforcing member is provided to prevent the pillar from tilting with respect to the floor portion when the force of the above is applied. A cab structure for construction machinery is provided characterized by having at least one of the reinforcing crossmembers to be bridged.

In the cab structure of the construction machine according to the present invention, the pillar having the extension portion may be a center pillar that bridges the middle of the roof portion in the front-rear direction of the vehicle body and the middle of the floor portion in the front-rear direction of the vehicle body.

In the cab structure of the construction machine according to the present invention, a floor cross member may be provided on the floor portion of the cab so as to bridge pillars having an extension portion.

In the cab structure of the construction machine according to the present invention, a roof cross member may be provided on the roof portion of the cab so as to bridge pillars having an extension portion.

According to the cab structure of the construction machine according to the present invention, at least a pair of pillars spaced apart in the vehicle width direction are extended below the floor portion, and the reinforcing members provided in the extended portions allow the pillars to roll over. The cab rigidity is increased by suppressing the inclination with respect to the floor part. In this way, the pillars are extended downward to the outside of the cab's living space, and the reinforcing member provided in the extended portion enhances the cab rigidity when the vehicle rolls over, so that the living space for the occupants is sacrificed. The cab can be reinforced without any need, and the rigidity of the cab can be increased when the vehicle rolls over.

It is explanatory drawing of the cab structure of the construction machine which shows 1st Embodiment of this invention, (a) is the perspective view which looked at the cab frame from diagonally rearward, (b) is the perspective view which looked up at the cab frame from below. .. FIG. 1 (a) is a view taken along the line II-II (front view of the cab frame). It is a perspective view which put the cab frame shown in FIG. 1 on the body frame. It is a perspective view from the diagonal rear of the cab equipped with the cab frame shown in FIG. 1. It is explanatory drawing of the cab structure of the construction machine which shows the 2nd Embodiment of this invention. (Front view of the cab frame). It is explanatory drawing of the cab structure of the construction machine which shows the 3rd Embodiment of this invention, (a) is the perspective view which looked at the cab frame from diagonally rearward, (b) is the perspective view which looked up at the cab frame from below. .. FIG. 6A is a view taken along the line VII-VII of FIG. 6A (front view of the cab frame). It is a front view of the cab structure of the construction machine which shows the conventional example.

Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings. The dimensions, materials, other specific numerical values, etc. shown in the embodiment are merely examples for facilitating the understanding of the invention, and do not limit the present invention unless otherwise specified. In the present specification and the drawings, elements having substantially the same function and configuration are designated by the same reference numerals to omit duplicate explanations, and elements not directly related to the present invention are not shown. do.

(Outline of cab structure of construction machine: 1st embodiment)
FIG. 1A shows a perspective view of a frame (cab frame) of a cab structure of a construction machine according to a first embodiment of the present invention as viewed diagonally from the rear, and FIG. 1B shows a cab frame from below. A perspective view looking up is shown, and FIG. 2 shows a view taken along the line II-II of FIG. 1 (a) (front view of the cab frame). In FIG. 1 (a), the diagonally upper left is the front in the traveling direction of the construction machine, and the diagonally lower right is the rear in the traveling direction.

As shown in FIGS. 1A and 1B, the cab structure of the construction machine according to the present embodiment has a plurality of pillars 4a and 4b between the roof portion 2 and the floor portion 3 of the cab 1. In the cab structure of a construction machine over which 4c is bridged, the lower ends of at least a pair of pillars 4b spaced apart from each other in the vehicle width direction among the plurality of pillars 4a, 4b, and 4c are extended below the floor portion 3. , The reinforcing member 5 is provided in the extended portion 4bx below the floor portion 3 of the pillars 4b. The reinforcing member 5 is a member for suppressing the pillar 4b from tilting with respect to the floor portion 3 when the construction machine rolls over and a force F (see FIG. 3) in the vehicle width direction is applied to the pillar 4b. A gusset plate 6 for connecting the extension portion 4bx and the floor portion 3 is provided. Hereinafter, each component will be described.

(Roof part 2, floor part 3)
As shown in FIGS. 1A and 1B, the roof portion 2 of the cab 1 bridges a pair of roof rails 2a spaced apart in the vehicle width direction and the front portions of the roof rails 2a. It includes a front header 2b provided and a rear header 2c provided so as to bridge the rear portions of the roof rail 2a. The floor portion 3 of the cab 1 includes a pair of floor rails 3a spaced apart in the vehicle width direction, a front cross member 3b provided so as to bridge the front portions of the floor rails 3a, and a rear portion of the floor rail 3a. It includes a rear cross member 3c provided so as to bridge each other, and a rectangular floor panel 3d provided inside these members 3a, 3b, and 3c.

(Pillars 4a, 4b, 4c)
As shown in FIGS. 1A and 1B, a plurality of pillars 4a, 4b, and 4c are bridged between the roof portion 2 and the floor portion 3 of the cab 1. Specifically, the front pillar 4a is laid between the front part of the floor rail 3a and the front part of the roof rail 2a, and the center pillar 4b is hung between the middle of the floor rail 3a and the middle of the roof rail 2a. Has been passed. The front pillar 4a and the roof rail 2a may have an integral structure in which a pipe is bent.

Further, although the rear pillar 4c is erected at the rear portion of the floor rail 3a, the rear pillar 4c extends only to the middle of the height to the rear portion of the roof rail 2a. A cross member 7 is bridged over the upper parts of the left and right rear pillars 4c, and a side member 8 is bridged between the upper part of the rear pillars 4c and the center pillar 4b. A space 10 for mounting the wind glass 9 (see FIG. 4) is formed between the side member 8 and the roof rail 2a, and between the cross member 7 and the rear header 2c. Since the rear pillar 4c does not exist in this space 10, the field of view diagonally behind the occupant (driver) D is widened.

In the present embodiment, the triangular mounting plate 11 is attached to the rear pillar 4c and the rear cross member 3c of the floor portion 3 by welding or the like, and the cab mount bracket (not shown, the cab 1 is mounted on the vehicle body) is attached to the mounting plate 11. Although the bracket for attaching to the frame) is attached, the cab mount bracket may be attached to the lower surface of the floor portion 3 of the cab 1.

(Reinforcing member 5, gusset plate 6)
As shown in FIGS. 1A, 1B, and 2), the pillar 4b having the stretched portion 4bx to which the above-mentioned reinforcing member 5 (gusset plate 6) is attached is the center pillar 4b. That is, the lower ends of the pair of center pillars 4b are extended below the floor portion 3, and the construction machine rolls over to the extended portion 4bx below the floor portion 3 of the center pillars 4b in the vehicle width direction. As a reinforcing member 5 for suppressing the center pillar 4b from tilting with respect to the floor portion 3 when a force F is applied, a gusset plate 6 connecting the extended portion 4bx and the floor portion 3 is attached. The gusset plate 6 is made of a right-angled triangular plate, and is fixed to the extended portion 4bx of the center pillar 4b and the floor portion 3 of the cab 1 by welding, bolts and nuts, or the like.

Even if the center pillar 4b is extended below the floor portion 3 of the cab 1, it does not interfere with the lower vehicle body frame. Explaining this point, as shown in FIG. 3, four mounting bases 13 are arranged in a square shape on the upper surface of the vehicle body frame 12 on which the cab 1 is mounted, with intervals in the vehicle length direction and the vehicle width direction. The four corners of the floor portion 3 of the cab 1 can be mounted on these mounting bases 13. Therefore, a clearance 14 corresponding to the height of the mounting base 13 is formed between the middle of the floor portion 3 (floor rail 3a) of the cab 1 and the upper surface of the vehicle body frame 12. Therefore, even if the center pillar 4b is extended below the floor portion 3 of the cab 1, it does not interfere with the vehicle body frame 12 within the range of the clearance 14, and the reinforcing member 5 (gusset plate 6) is attached to the extended portion 4bx. Can be provided appropriately.

(Floor cross member 3e, roof cross member 2d)
As shown in FIGS. 1A, 1B, and 2, the floor portion 3 of the cab 1 is provided with a floor cross member 3e so as to bridge the center pillars 4b having the extension portions 4bx. ing. Further, the roof portion 2 of the cab 1 is provided with a roof cross member 2d so as to bridge the center pillars 4b having the extended portions 4bx. As a result, as shown in FIG. 2, when the cab 1 is viewed from the front, the pair of center pillars 4b and 4b, the floor cross member 3e and the roof cross member 2d form a frame body 15 that surrounds the occupant D. NS. The gusset plate 6 as the reinforcing member 5 is fixed to the floor cross member 3e of the floor portion 3 and the extended portion 4bx of the center pillar 4b by welding or the like.

As shown in FIG. 2, a reinforcing member 5 (gusset plate 6) is provided at a corner between the extended portion 4bx of the center pillar 4b extended downward from the frame body 15 and the floor cross member 3e of the floor portion 3. Therefore, when a force F in the vehicle width direction is applied to the roof portion 2 of the cab 1 during the ROPS test, or when the construction machine rolls over and a force F in the vehicle width direction is applied to the roof portion 2 of the cab 1, the frame The situation in which the body 15 is crushed (squashed) into a parallel quadrilateral shape, that is, the matchbox deformation of the cab 1 can be appropriately suppressed. Further, since the gusset plate 6 which is the reinforcing member 5 is provided below the floor portion 3 of the cab 1, the living space for the occupant D is not sacrificed at all, and the visibility of the occupant D is obstructed. It never becomes.

(Action / effect)
According to the cab structure of the construction machine according to the present embodiment, as shown in FIGS. 1A, 1B, and 2, a pair of center pillars 4b spaced apart in the vehicle width direction are floor portions. Reinforcing members 5 (gusset plates 6) that are stretched below 3 and provided on the stretched portions 4bx increase the coupling rigidity between the stretched portion 4bx of the center pillar 4b and the floor portion 3 of the cab 1, and are centered when the vehicle rolls over. The pillar 4b is prevented from tilting with respect to the floor portion 3. In this way, the center pillar 4b is extended downward to the outside of the living space of the cab 1, and the reinforcing member 5 (gusset plate 6) provided in the extended portion 4bx enhances the cab rigidity when the vehicle body rolls over. The cab 1 can be reinforced without sacrificing any living space for the occupant D, and the cab rigidity with respect to the force F applied to the cab 1 when the vehicle rolls over can be increased.

As shown in FIG. 3, in the cab 1, the four corners of the floor portion 3 are mounted on the four mounting bases 13 provided on the vehicle body frame 12. Therefore, as shown in FIG. 4, even if the center pillar 4b is stretched below the floor portion 3 of the cab 1, the stretched portion 4bx is within the range of the clearance 14 corresponding to the height of the mounting table 13. It does not interfere with the vehicle body frame 12. Therefore, the center pillar 4b can be stretched below the floor portion 3 of the cab 1 by the length required for reinforcement within the range of the clearance 14, and the reinforcing member 5 (gusset plate 6) provided in the stretched portion 4bx allows the center pillar 4b to be stretched. , The cab rigidity can be increased accurately.

As shown in FIG. 1A, the floor portion 3 of the cab 1 is provided with a floor cross member 3e that bridges the center pillars 4b to each other, and the roof portion 2 is provided with a roof cross member 2d that bridges the center pillars 4b to each other. Therefore, as shown in FIG. 2, the frame 15 is configured by the left and right center pillars 4b and 4b, the floor cross member 3e and the roof cross member 2d so as to surround and protect the occupant D.

Since the reinforcing member 5 (gusset plate 6) is provided at the corner between the extended portion 4bx of the center pillar 4b extended downward from the frame body 15 and the floor cross member 3e of the floor portion 3, the occupant D can use the reinforcing member 5. The cab 1 can be reinforced without sacrificing any living space for the vehicle, and the rigidity of the frame 15 with respect to the force F applied to the cab 1 when the vehicle body rolls over can be increased. Therefore, when the vehicle body rolls over, the frame 15 that surrounds and protects the occupant D is crushed into a parallel four-sided shape, that is, the matchboxing deformation of the cab 1 can be appropriately suppressed, and a living space can be secured in the deformed cab 1.

As shown in FIG. 1A, the rear pillar 4c extends only to the middle of the height to the rear of the roof rail 2a, and the cross member 7 and the rear header 2c spanning the upper parts of the left and right rear pillars 4c. A space 10 for mounting the wind glass 9 (side glass, back glass) shown in FIG. 4 is formed between the side member 8 that bridges the upper portion of the rear pillar 4c and the center pillar 4b and the roof rail 2a. ing. Therefore, the view diagonally behind the occupant D (driver) is not obstructed by the rear pillar 4c, and the rear view is widened.

(Second Embodiment)
A second embodiment of the present invention is shown in FIGS. 5 (a) and 5 (b). The cab structure of the construction machine according to the second embodiment has basically the same configuration as that of the first embodiment, and is a second gusset having a triangular plate shape at a corner of the cab 1 of the center pillar 4b and the floor portion 3. The point that the plate 16 is added is different from the first embodiment. Since the other components have the same configuration, the same components are designated by the same reference numerals and the description thereof will be omitted.

According to the second embodiment, since the second gusset plate 16 is added, the rigidity of the frame body 15 with respect to the force F applied to the cab 1 when the vehicle body rolls over can be increased as compared with the first embodiment. Therefore, when the vehicle body rolls over, the matchboxing deformation of the cab 1 can be further suppressed, and a living space can be secured in the deformed cab 1. Since the second gusset plate 16 is provided at the corner between the center pillar 4b and the floor portion 3, it has almost no effect on the occupancy of the occupant D in the cab 1, and the visibility of the occupant D during driving is not affected. Does not interfere with. The basic action and effect of the second embodiment are the same as those of the first embodiment.

(Third Embodiment)
A third embodiment of the present invention is shown in FIGS. 6 (a), 6 (b), and 7. The cab structure of the construction machine according to the third embodiment has basically the same configuration as that of the first embodiment, and the reinforcing member 5 has a reinforcing cross member 17 that bridges the lower portions of the extended portion 4bx of the center pillar 4b. It is different from the first embodiment in that it is provided. Since the other components have the same configuration, the same components are designated by the same reference numerals and the description thereof will be omitted.

According to the third embodiment, since the reinforcing cross member 17 for connecting the lower portions of the extended portion 4bx of the center pillar 4b is provided, the rigidity of the frame body 15 with respect to the force F applied to the cab 1 when the vehicle body rolls over can be increased. .. That is, as shown in FIG. 7, when the cab 1 is viewed from the front, the left and right center pillars 4b, the roof cross member 2d, the floor cross member 3e, and the reinforcing cross member 17 form a frame 15 having a so-called Japanese character structure. Therefore, the rigidity of the frame body with respect to the force F applied to the cab 1 when the vehicle body rolls over is increased. Further, wiring pipes 18 such as various electric wires (wire harnesses) and air conditioning ducts may be arranged between the floor portion 3 (floor cross member 3e) of the cab 1 and the reinforcing cross member 17.

As shown in FIG. 7, between the floor cross member 3e of the cab 1 and the reinforcing cross member 17, the extension portion 4bx of the center pillar 4b, the floor portion 3 of the cab 1 (floor cross member 3e), and the reinforcing cross member 17 A square plate-shaped gusset plate 19 fixed to the gusset plate 19 may be added. Further, a triangular plate-shaped gusset plate 20 fixed to a corner portion in the cab 1 of the center pillar 4b and the floor portion 3 may be added. By adding these gusset plates 19 and 20, the rigidity of the frame body 15 with respect to the force applied to the cab 1 when the vehicle body rolls over is further increased without affecting the comfort of the occupant D in the cab 1. The basic action and effect of the third embodiment are the same as those of the first embodiment.

Although the preferred embodiments of the present invention have been described above with reference to the accompanying drawings, the present invention is not limited to the above-described embodiments, and various modifications in the scope of claims are described. It goes without saying that the modified examples also belong to the technical scope of the present invention. For example, the pillar having the stretched portion 4bx is not limited to the center pillar 4b, but may be a front pillar 4a or a rear pillar 4c, all of these pillars 4a, 4b, 4c, or any two of the pillars 4a, 4b, and 4c. The construction machinery includes a hydraulic excavator, a hydraulic crane, and an arculated dump truck.

INDUSTRIAL APPLICABILITY The present invention can be used for a cab structure of a construction machine in which the cab can be reinforced without sacrificing a living space for occupants and the cab rigidity when the vehicle rolls over is increased.

1 Cab 2 Roof part 2d Roof cross member 3 Floor part 3e Floor cross member 4a, 4b, 4c Multiple pillars 4b At least a pair of pillars (center pillar)
4bx Extension 5 Reinforcing member 6 Gusset plate 17 Reinforcing cross member 19 Gusset plate F Force in vehicle width direction

Claims (4)

It is a cab structure of construction machinery in which multiple pillars are laid between the roof part and the floor part of the cab.
Among the plurality of pillars, the lower ends of at least a pair of pillars spaced apart from each other in the vehicle width direction are extended below the floor portion, and the construction machine is formed at the extending portion below the floor portion of those pillars. A reinforcing member is provided to prevent the pillar from tilting with respect to the floor portion when the pillar rolls over and a force in the vehicle width direction is applied to the pillar.
The cab structure of a construction machine is characterized in that the reinforcing member includes at least one of a gusset plate connecting the stretched portion and the floor portion and a reinforcing cross member for connecting the lower portions of the stretched portion to each other. .. The construction according to claim 1, wherein the pillar having the extended portion is a center pillar that bridges the middle of the roof portion in the front-rear direction of the vehicle body and the middle of the floor portion in the front-rear direction of the vehicle body. Machine cab structure. The cab structure of a construction machine according to claim 1 or 2, wherein a floor cross member is provided on the floor portion of the cab so as to bridge the pillars having the extension portions. The cab of a construction machine according to any one of claims 1 to 3, wherein a roof cross member is provided on the roof portion of the cab so as to bridge the pillars having the extending portions. structure.

Images