JP2005170332A - Cab for construction machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To heighten the strength against the load acting on the root part of a center pillar and the load acting so as to twist the center pillar and enhance the stiffness of a cab box. <P>SOLUTION: A cab 11 includes a reinforcing device 28 consisting of a floor plate reinforcing member 29 extending to the left and right on the floor plate 27 of the cab 11 and heightening the strength of the floor plate 27 and a coupling member 31 to couple the left end of the floor plate reinforcing member 29 with the center pillar 20 of the cab box 12. Accordingly the reinforcing device 28 can strengthen the root part of the center pillar 20 upon reinforcement of the floor plate 27, the strength of the cab box 12 can be heightened both for the load F acting from the left on the center pillar 20 and the load R acting so as to twist the center pillar 20. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a cab for construction machines provided in, for example, a hydraulic excavator, and more particularly to a cab for construction machines in which a center pillar is provided on a side surface portion of a cab box.

  In general, a hydraulic excavator as a construction machine is provided with a self-propelled lower traveling body, an upper revolving body that is turnably mounted on the lower traveling body, and a front-rear side of the upper revolving body that can be raised and lowered. And a work device.

  Further, on the turning frame constituting the upper turning body, a cab is provided which is positioned on the left front side and on which the operator gets on. The cab of this excavator includes a cab box having a front surface portion, a rear surface portion, a left side surface portion, a right side surface portion, and a top surface portion, a floor plate that covers the cab box from the lower side, and an operator seated on the floor plate. With seats.

  Moreover, the floor board is formed from the substantially flat board, for example. On the other hand, the driver's seat is provided on the floor board via a pedestal or the like, and operation levers for operating the work device are disposed on the left and right sides thereof. In addition, a traveling lever / pedal is provided on the front side of the driver's seat, which is located in the front portion of the floor board and travels the lower traveling body.

  On the other hand, the left side surface portion of the cab box is provided with a center pillar that is located in the middle of the front and rear directions and extends upward and downward, and serves as a loading / unloading opening that opens and closes from the center pillar by a door.

  Here, since the cab is for the operator to work inside, the cab needs to be strong enough to withstand an impact such as a fall or an obstacle collision in order to protect the operator. The center pillar also functions as a support column that can withstand these loads and suppress damage (deformation) of the cab.

  Furthermore, the cab of the excavator is provided with a reinforcing plate which is positioned from the middle in the front and rear directions to the rear side and is bent in an L shape, and the front portion of the plate is fixed to the reinforcing plate. There is one in which the strength of the cab is increased by fixing the rear portion of the plate to the rear surface portion of the cab box (see, for example, Patent Document 1).

JP-A-11-165660

  By the way, in the thing by the patent document 1 mentioned above, the intensity | strength of a cab is raised by connecting a floor board and the rear surface part of a cab box with a reinforcement. However, when a situation occurs in which the excavator falls, the load at this time greatly acts on the left side surface portion of the cab box. In particular, the load acting on the cab box concentrates on the root portion of the center pillar or the like that forms the left side surface portion, and acts to tilt the center pillar. In addition, the load at the time of the fall hardly acts on the left side surface portion, and acts so as to twist the center pillar around the center pillar forming the support column.

  For this reason, in the configuration in which the floor plate and the rear surface portion of the cab box are connected by a reinforcing body as in Patent Document 1, the cab box is caused by the load concentrated on the center portion of the center pillar and the load acting to twist the center pillar. There is a problem that there is a risk of significant deformation.

  The present invention has been made in view of the above-described problems of the prior art, and the object of the present invention is to increase the strength against the load acting on the root portion of the center pillar and the load acting to twist the center pillar, An object of the present invention is to provide a cab for construction machinery that can improve the rigidity of the cab box.

  A construction machine according to the invention of claim 1 is provided on a frame of the construction machine, a cab box having a front surface portion, a rear surface portion, a left side surface portion, a right side surface portion and a top surface portion, and a floor board that covers the cab box from below. And a driver's seat on which the operator sits, and one of the left and right side portions of the cab box is located in the middle of the front and rear directions and extends upward and downward. A center pillar is provided.

  In order to solve the above-described problem, the feature of the configuration adopted by the invention of claim 1 is that the floorboard is located in the middle of the front and rear directions and extends in the left and right directions. The reinforcing means for supporting the center pillar of the cab box is provided at one end.

  According to the second aspect of the present invention, the reinforcing means includes a floor plate reinforcing member provided to extend left and right on the floor plate, and a connection for connecting one end of the floor plate reinforcing member and the center pillar of the cab box. This is because it is composed of members.

  According to the invention of claim 3, the floor plate reinforcing member of the reinforcing means has the front and rear vertical surfaces and the upper horizontal surface and is formed to extend in the left and right directions, and the connecting member is the front of the floor plate reinforcing member. The configuration is such that it is fixed to at least two of the vertical surface, the rear vertical surface, and the upper horizontal surface.

  According to the invention of claim 4, the floor plate reinforcing member of the reinforcing means is configured such that one end portion is disposed with a gap from the center pillar of the cab box.

  According to the invention of claim 5, the connecting member of the reinforcing means extends in the left and right directions and is attached to the floor plate reinforcing member, and the cab box extends upward from one end of the reinforcing member mounting plate portion. The pillar mounting plate portion attached to the center pillar, the edge of the reinforcing member mounting plate portion, and the edge of the pillar mounting plate portion are fixed and are different from the reinforcing member mounting plate portion with respect to the floor plate reinforcing member. And a side plate portion attached to the surface.

  According to the invention of claim 6, the pedestal is provided on the floor plate on the front side of the reinforcing means, and the driver's seat is supported by the reinforcing means and the pedestal.

  According to the invention of claim 1, the reinforcing means provided on the floor board can support the root portion of the center pillar of the cab box at one end portion in the left and right directions. Thereby, for example, even when a large load is applied to one side surface portion of the cab box, the deformation of the center pillar, that is, the deformation of the cab box can be suppressed to be small. As a result, the rigidity of the cab can be increased, and the reliability and safety can be improved.

  According to the invention of claim 2, the center pillar can be supported via the connecting member after the strength of the floor plate is increased by the floor plate reinforcing member of the reinforcing means, and the support strength of the center pillar is further increased. Can do. Further, by forming the reinforcing means from the floor plate reinforcing member and the connecting member, it is possible to easily cope with cabs having different shapes and sizes.

  Further, in order to increase productivity, the cab is assembled with the floor board assembly and the cab box after assembling the driver's seat, lever, and the like to the floor board. Even in such a case, the reinforcing means can attach the driver's seat, lever, etc. to the floor board in a state where the floor board reinforcing member is attached to the floor board. After the floor board assembly and the cab box are assembled, the floor board reinforcing member And the center pillar can be integrally connected by the connecting member. As a result, the rigidity of the cab can be increased without impairing productivity.

  According to invention of Claim 3, the connection member of a reinforcement means can be fixed to the vertical surface and horizontal surface of a floor board reinforcement member. As a result, the reinforcing means can increase the strength against both the load acting on the center pillar in the left and right directions and the load acting to twist the center pillar. In addition, the floorboard reinforcing member composed of the front and rear vertical surfaces and the upper horizontal surface and extending in the left and right directions does not get in the way just across the floorboard. Thereby, various levers, pedals, electric parts, air conditioners and the like can be efficiently arranged in the cab, and the working environment can be improved.

  According to the invention of claim 4, when the floor board is assembled to the lower side of the cab box, it is possible to prevent the floor board reinforcing member from interfering with the cab box by the gap, thereby improving the assembly workability and the yield. be able to.

  According to the invention of claim 5, since the connecting member can be three-dimensionally formed by the reinforcing member mounting plate portion, the pillar mounting plate portion, and the side plate portion, the load can be applied from various directions without increasing the plate thickness. On the other hand, a high strength can be obtained, and the handleability can be improved and the cost can be reduced. Then, the connecting member and the floor board reinforcing member are attached by attaching the reinforcing member attaching plate part to the floor board reinforcing member, attaching the pillar attaching plate part to the center pillar, and attaching the side plate part to a surface different from the reinforcing member attaching plate part of the floor board reinforcing member. Thus, the rigidity of the cab can be increased.

  According to the invention of claim 6, since the reinforcing means supports the driver's seat together with the pedestal, it is not necessary to provide a dedicated space for installing the reinforcing means on the floor board. It can be widened and the strength of the cab can be increased.

  Hereinafter, a cab mounted on a crawler hydraulic excavator will be described as an example of a cab for a construction machine according to an embodiment of the present invention, and will be described in detail with reference to FIGS.

  In FIG. 1, reference numeral 1 denotes a crawler hydraulic excavator as a construction machine. The hydraulic excavator 1 is mounted on a self-propelled lower traveling body 2 and on the lower traveling body 2 so as to be turnable. 2 is constituted roughly by an upper swing body 3 constituting a vehicle body and a work device 4 provided on the front side of the upper swing body 3 so as to be able to move up and down and performing excavation work of earth and sand.

  The upper swing body 3 includes a swing frame 5, a cab 11 described later mounted on the left side of the front portion of the swing frame 5, a counterweight 6 attached to a rear end portion of the swing frame 5, and the cab. 11, an engine (not shown) mounted on the swivel frame 5 located on the rear side of the cab 11, and an exterior that is provided on the swivel frame 5 from the right side to the rear side of the cab 11 and defines a machine room The cover 7 is generally constituted.

  Reference numeral 11 denotes a cab mounted on the left side of the front portion of the revolving frame 5, and the cab 11 defines a cab in which an operator gets on. As shown in FIGS. 2 and 3, the cab 11 is roughly configured by a cab box 12, a floor plate 27, a reinforcing device 28, a driver seat 35, and the like which will be described later.

  A cab box 12 is provided on the revolving frame 5, and the cab box 12 constitutes the outer shape of the cab 11. The cab box 12 is formed as a box-like body by a front surface portion 12A, a rear surface portion 12B, a left surface portion 12C, a right surface portion 12D, and a top surface portion 12E provided on a base frame 13 described later. Further, a front window (not shown) is attached to the front surface portion 12A, and a door 23 described later is attached to the left side surface portion 12C.

  Reference numeral 13 denotes a base frame that serves as a base of the cab box 12, and the base frame 13 is formed by connecting a front frame 13A, a rear frame 13B, a left frame 13C, and a right frame 13D made of, for example, a steel material having an L-shaped cross section. It is formed as a rectangular frame that is long in the front and rear directions. Further, a floor plate 27 described later can be attached to the base frame 13 from below.

  Reference numeral 14 denotes a left front pillar that extends upward at corners of the front frame 13A and the left frame 13C of the base frame 13, and the left front pillar 14 is formed between the front surface portion 12A and the left side surface portion 12C of the cab box 12. The ridgeline between them is formed. Reference numeral 15 denotes a right front pillar that extends upward at the corners of the front frame 13A and the right frame 13D of the base frame 13, and the right front pillar 15 includes the front surface portion 12A and the right side surface portion 12D of the cab box 12. A ridgeline between the two is formed.

  On the other hand, 16 is a left rear pillar that extends upward at the corners of the rear frame 13B and the left frame 13C of the base frame 13, and the left rear pillar 16 is formed on the left side of the cab box 12 with the rear surface portion 12B. A ridgeline between the surface portion 12C is formed. Reference numeral 17 denotes a right rear pillar that extends upward at the corners of the rear frame 13B and the right frame 13D of the base frame body 13, and the right rear pillar 17 includes the rear surface portion 12B and the right side of the cab box 12. A ridgeline between the surface portion 12D is formed.

  Further, 18 is a left roof pillar that extends in the front and rear direction over the upper part of the left front pillar 14 and the upper part of the left rear pillar 16, and the left roof pillar 18 includes a left side part 12C and a top face part 12E of the cab box 12. A ridgeline between the two is formed. Reference numeral 19 denotes a right roof pillar that extends in the front and rear direction over the upper part of the right front pillar 15 and the upper part of the right rear pillar 17, and the right roof pillar 19 includes a right side part 12D and a top face part 12E of the cab box 12. A ridgeline between the two is formed. The roof pillars 18 and 19 are connected by a plurality of connecting frames (not shown) extending in the left and right directions.

  And each pillar 14-19 consists of a deformed steel pipe etc. which have the cross-sectional shape according to each, a bending shape, etc., for example, and is being fixed to the member used as object using fixing means, such as welding.

  Reference numeral 20 denotes a center pillar provided on the left side surface portion 12C of the cab box 12. The center pillar 20 includes an inner panel 21 and an outer panel 22 which are pressed into a substantially L shape as shown in FIGS. It is formed as a hollow plate by being fixed by welding means. The center pillar 20 includes a pillar portion 20A that extends upward and downward, and a side panel portion 20B that is integrally provided on the lower side of the pillar portion 20A.

  Here, the pillar portion 20A is formed as a rectangular tube body, such as a rectangular tube body, a long cylindrical body, an elliptical cylinder body, and the like that is located in the middle of the front and rear directions of the left side surface portion 12C and extends upward and downward. . Further, the pillar portion 20 </ b> A has a lower end portion fixed to the left frame 13 </ b> C of the base frame body 13 by welding or the like, and an upper end portion fixed to the left roof pillar 18. Accordingly, the pillar portion 20A functions as a support column that suppresses damage (deformation) of the cab 11 when the excavator 1 falls or a heavy object collides, for example.

  Further, as shown in FIGS. 5 and 7, the inner surface 21 </ b> A of the inner panel 21 that forms the pillar 20 </ b> A has two bolt insertion holes 21 </ b> B at a lower position, which is a base portion, with an interval between the upper side and the lower side. Is provided. Furthermore, a nut 21C used as a screw hole is fixed to the back surface of the inner panel 21 corresponding to each bolt insertion hole 21B.

  On the other hand, the side panel portion 20B of the center pillar 20 is formed as a rectangular hollow structure extending rearward from the lower side of the pillar portion 20A, and the lower end portion is fixed to the left frame 13C of the base frame 13 by welding or the like. The rear end is fixed to the left rear pillar 16.

  Reference numeral 23 denotes a door (shown in FIGS. 1 and 2) provided between the center pillar 20 and the left front pillar 14, and the rear side of the door 23 is attached to the pillar portion 20 </ b> A of the center pillar 20 so as to be openable and closable. Yes.

  Reference numeral 24 denotes a rear panel that forms the rear surface portion 12B of the cab box 12. The rear panel 24 is welded to the rear frame 13B of the base frame 13, the left rear pillar 16, the right rear pillar 17, and the rear connecting frame at the edge. It is fixed by means.

  Reference numeral 25 denotes a side panel that forms the right side surface portion 12D of the cab box 12. The side panel 25 has end edges fixed to the right frame 13D, the right front pillar 15, and the right rear pillar 17 of the base frame 13 by welding means. Yes.

  Reference numeral 26 denotes a roof panel forming the top surface portion 12E of the cab box 12. The roof panel 26 is fixed to the left roof pillar 18, the right roof pillar 19, each connecting frame, and the like by welding means.

  Reference numeral 27 denotes a floor plate that covers the cab box 12 from below, and the floor plate 27 is formed as a substantially rectangular plate that is long in the front and rear directions so as to be accommodated in the base frame body 13. The floor plate 27 is attached to the base frame 13 using a plurality of bolts or the like. The floor plate 27 is formed with a plurality of screw holes 27A at substantially the same front and rear positions as the pillar portion 20A of the center pillar 20, and each screw hole 27A fixes a floor plate reinforcing member 29 described later. Thus, for example, four rows are provided in a row, and two rows are provided before and after.

  Reference numeral 28 denotes a reinforcing device provided as a reinforcing means provided on the floor plate 27. The reinforcing device 28 increases the strength of the floor plate 27 and supports the center pillar 20 constituting the cab box 12 from the room, thereby 11 is increased. The reinforcing device 28 also serves as a support base that supports the driver's seat 35 together with a pedestal 32 described later. The reinforcing device 28 is roughly constituted by a floor plate reinforcing member 29 and a connecting member 31 to be described later, and is located in the middle of the front and rear directions of the floor plate 27 and extends left and right.

  Reference numeral 29 denotes a floor plate reinforcing member provided on the floor plate 27. The floor plate reinforcing member 29 is located in the middle of the front and rear directions substantially the same as the pillar portion 20A of the center pillar 20, as shown in FIGS. Left and right. Further, the floor board reinforcing member 29 includes a front vertical surface portion 29A and a rear vertical surface portion 29B which are arranged in parallel in a separated manner in the front and rear directions, and an upper horizontal portion provided over the upper portions of the vertical surface portions 29A and 29B. The surface 29C is formed as a rigid body having a U-shaped cross section. Thereby, the floor board reinforcement member 29 has high rigidity with respect to a bending, a twist, etc.

  Further, each vertical surface portion 29A, 29B of the floor plate reinforcing member 29 is provided with a flange portion 29D extending from the lower portion in the front and rear directions, and each flange portion 29D has a floor plate 27 as shown in FIG. Four bolt insertion holes 29E are formed in the upward and downward directions corresponding to the screw holes 27A. Further, two screw holes 29F are formed in the front and rear vertical surface portions 29A and 29B so as to be located on the left side which is the center pillar 20 side. Further, two screw holes 29G are formed in the upper horizontal surface portion 29C on the left side.

  Then, the floor plate reinforcing member 29 is inserted into each bolt insertion hole 29E provided in each flange portion 29D, and the bolt 30 is screwed into the screw hole 27A of the floor plate 27, whereby the floor plate 27 is attached to the floor plate 27. Can be installed integrally. Further, in a state in which the floor board reinforcing member 29 is mounted on the floor board 27, the rigid floor board reinforcing member 29 can suppress the bending, twisting, and the like of the floor board 27 and increase the strength of the floor board 27.

  Here, the left end portion of the floor board reinforcing member 29 is disposed on the floor board 27 with a gap G1 from the pillar portion 20A of the center pillar 20. The gap G1 is dimensioned so that the floor plate reinforcing member 29 does not interfere with the cab box 12 (base frame 13 or the like) when the floor plate 27 having the floor plate reinforcing member 29 or the like attached to the lower side of the cab box 12 is assembled. Is set.

  The floor board reinforcing member 29 has a gap G2 between its right end and the right side panel 25. This gap G2 is formed wider than the gap G1 in consideration of the low possibility of a load acting on the right side of the cab 11 and the arrangement of an air duct (not shown) of the air conditioner. Yes.

  31 is a connecting member provided between the floor board reinforcing member 29 and the center pillar 20 of the cab box 12, and the connecting member 31 is below the left end part of the floor board reinforcing member 29 and the pillar part 20 </ b> A forming the center pillar 20. The side portions are connected with high strength.

  Further, the connecting member 31 forms the center pillar 20 from the reinforcing member mounting plate portion 31A extending left and right along the upper lateral surface portion 29C of the floor plate reinforcing member 29 and the left end portion of the reinforcing member mounting plate portion 31A. The pillar mounting plate portion 31B extending upward along the inner surface portion 21A of the inner panel 21, and the front end edge portion of the reinforcing member mounting plate portion 31A and the front end edge portion of the pillar mounting plate portion 31B are fixed. 31 C of front side plate parts, and the rear side plate part fixed over the rear end edge part of 31 A of said reinforcement member and the rear end edge part of pillar mounting plate part 31B so that it may become parallel to this front side plate part 31C 31D.

  Further, two bolt insertion holes 31E corresponding to the two screw holes 29G provided in the upper lateral surface portion 29C of the floor plate reinforcing member 29 are formed in the reinforcing member attaching plate portion 31A. The pillar mounting plate 31B is formed with two bolt insertion holes 21B provided on the inner surface 21A of the inner panel 21 constituting the center pillar 20 and two bolt insertion holes 31F corresponding to the nuts 21C. ing.

  Further, the front and rear side plate portions 31C, 31D are formed to extend below the reinforcing member mounting plate portion 31A, and are provided with two screw holes 29F provided in the vertical surface portions 29A, 29B of the floor plate reinforcing member 29. Two bolt insertion holes 31G corresponding to are respectively formed. Further, arc-shaped cutouts 31C1 and 31D1 are formed on upper portions of the front and rear side plate portions 31C and 31D so as to avoid a console 37 described later.

  Here, the connecting member 31 has a front and rear interval W between the front side plate portion 31C and the rear side plate portion 31D so that the front vertical surface portion 29A and the rear vertical surface portion 29B of the floor plate reinforcing member 29 are tightly sandwiched, The dimensions are set so as not to rattle. Further, it is desirable that the length D in the left and right directions of the connecting member 31 is set to a maximum dimension within a range that does not interfere with a seat stand 33 described later. Further, the height H in the upward and downward directions is desirably set to a maximum dimension within a range that does not interfere with the operator's lever operation without interfering with the console 37 described later.

  Then, the connecting member 31 presses the reinforcing member mounting plate portion 31A against the upper horizontal surface portion 29C of the floor plate reinforcing member 29, and in this state, the bolt 30 passed through the bolt insertion hole 31E is formed on the upper horizontal surface portion 29C of the floor plate reinforcing member 29. Screwed into the screw hole 29G. Further, the bolts 30 passed through the bolt insertion holes 31G of the front and rear side plate portions 31C and 31D are screwed into the screw holes 29F of the front and rear vertical surface portions 29A and 29B of the floor plate reinforcing member 29. Accordingly, the connecting member 31 can be fixed to the three surfaces of the vertical surface portions 29A and 29B and the upper horizontal surface portion 29C before and after the floor plate reinforcing member 29 is formed, and is firmly attached to the floor plate reinforcing member 29. be able to.

  Further, the connecting member 31 is pressed against the inner surface portion 21A of the inner panel 21 forming the center pillar 20, and in this state, the bolt 30 passed through the bolt insertion hole 31F is screwed to the nut 21C of the inner panel 21. Thereby, the connecting member 31 can be attached to the pillar portion 20 </ b> A of the center pillar 20.

  As described above, in a state where the floor board reinforcing member 29 and the center pillar 20 of the cab box 12 are connected by the connecting member 31, the reinforcing device 28 is subjected to a large load in the direction indicated by the arrow F shown in FIG. Even when a load acts in the direction of the arrow R so as to twist 20, it is possible to support the root portion of the center pillar 20 and suppress deformation of the center pillar 20, that is, deformation of the cab box 12.

  Reference numeral 32 denotes a pedestal provided on the floor plate 27 so as to be located on the front side of the floor plate reinforcing member 29. The pedestal 32 has, for example, substantially the same shape as the floor plate reinforcing member 29. Thereby, the base 32 can raise the intensity | strength of the floor board 27 similarly to the floor board reinforcement member 29. FIG.

  A seat stand 33 is disposed above the floor plate reinforcing member 29 and the pedestal 32 via a front / rear direction adjusting mechanism 34. The seat stand 33 is moved forward by a front / rear direction adjusting mechanism 34 together with a driver's seat 35, which will be described later. , You can adjust the position in the backward direction.

  Reference numeral 35 denotes a driver seat mounted on the upper side of the seat stand 33 via a vertical adjustment mechanism 36 (both are shown by a two-dot chain line). The driver seat 35 is seated by an operator, and the seating position is moved up and down. The height can be adjusted by the direction adjusting mechanism 36. Further, as shown in FIG. 4, consoles 37 are provided on both the left and right sides of the driver seat 35, and each console 37 is provided with an operation lever 38 for operating the work device 4. Further, on the front side of the driver's seat 35, a traveling lever / pedal 39 that is disposed in front of the floor plate 27 and travels the lower traveling body 2 is provided.

  The cab 11 of the hydraulic excavator 1 according to the present embodiment has the above-described configuration. Next, a procedure for assembling the cab 11 will be described.

  In order to increase the productivity of the cab 11, for example, after the parts are assembled to the floor board 27, the floor board 27 and the cab box 12 are assembled. That is, on the floor plate 27 side, the floor plate reinforcing member 29 and the pedestal 32 of the reinforcing device 28 are attached to the floor plate 27, and the seat stand 33, the driver's seat 35, the console 37, and the like are mounted on the floor plate reinforcing member 29 and the pedestal 32. Further, by attaching a traveling lever / pedal 39 or the like to the front portion of the floor plate 27, a floor plate assembly is formed.

  Next, when the floor board assembly is formed, as shown in FIG. 8, the driver's seat 35 and the like are passed from the lower side of the cab box 12, and the floor board 27 is bolted to the base frame body 13. At this time, the floor board reinforcing member 29 attached to the floor board 27 has a gap G1 between the left end portion and the center pillar 20, so that the floor board reinforcing member 29 is not brought into contact with the cab box 12 and assembled. Can be attached.

  When the floor plate 27 is attached to the lower side of the cab box 12, the connecting member 31 is bolted to the floor plate reinforcing member 29 and the center pillar 20 as shown in FIG. 5. Accordingly, the reinforcing device 28 can increase the strength of the floor plate 27 by the floor plate reinforcing member 29 and the like, and can support the base portion of the center pillar 20 from the room by the connecting member 31 attached to the floor plate reinforcing member 29. The rigidity of the cab box 12 can be increased.

  Next, the operator who has boarded the cab 11 assembled as described above can sit in the driver's seat 35 and operate the traveling lever / pedal 39 to move the lower traveling body 2 forward and backward, for example. Further, by operating the operation lever 38, excavation work of earth and sand can be performed.

  Thus, according to the present embodiment, the floor plate 27 of the cab 11 is provided with the reinforcing device 28 that supports the center pillar 20 of the cab box 12. For example, the excavator 1 falls and the cab box 12 Even when a large load is applied to the left side surface portion 12C, the deformation of the center pillar 20, that is, the deformation of the cab box 12 can be kept small. As a result, the rigidity of the cab box 12 can be increased, and the reliability and safety of the cab 11 can be improved.

  Further, the reinforcing device 28 is located on the floor plate 27 side and is provided on the floor plate 27 so as to extend left and right, and the left end of the floor plate reinforcing member 29 and the center pillar of the cab box 12. 20 and a connecting member 31 that connects the two. Accordingly, the reinforcing device 28 can support the center pillar 20 via the connecting member 31 after the floor plate 27 is reinforced by the floor plate reinforcing member 29, so that the rigidity of the cab 11 can be further increased. In addition, by preparing a plurality of types of floor plate reinforcing members 29 and connecting members 31, it is possible to easily cope with cabs 11 having different shapes and sizes.

  Further, the cab 11 can be assembled with the seat stand 33, the driver's seat 35, the operation lever 38 and the like on the floor plate 27 in a state where the floor plate reinforcing member 29 is attached to the floor plate 27. In addition, the floor board reinforcing member 29 and the center pillar 20 can be integrally connected by the connecting member 31. Thereby, the rigidity of the cab 11 can be improved without impairing productivity.

  Further, since the connecting member 31 is configured to be fixed to the three surfaces of the front and rear vertical surface portions 29A and 29B and the upper horizontal surface portion 29C of the floor plate reinforcing member 29, the connecting member 31 and the floor plate reinforcing member 29 are firmly connected. Can be linked to. Accordingly, the reinforcing device 28 can increase the strength with respect to both the load F acting on the center pillar 20 from the left direction and the load R acting so as to twist the center pillar 20. Further, the floor plate reinforcing member 29 composed of the front and rear vertical surface portions 29A and 29B and the upper horizontal surface portion 29C does not get in the way only by crossing the floor plate 27. As a result, the operation lever 38, the travel lever / pedal 39, the electrical parts, the air conditioner (not shown), etc. can be efficiently arranged in the cab 11, and the working environment can be improved.

  On the other hand, since the gap G1 is provided between the left end portion of the floor plate reinforcing member 29 and the pillar portion 20A of the center pillar 20, when the floor plate 27 is assembled to the lower side of the cab box 12, the floor plate reinforcing member 29 is Interference with the cab box 12 can be prevented. Thereby, the assembly workability | operativity at the time of assembling the cab 11 and a yield can be improved.

  Further, the connecting member 31 can be three-dimensionally formed by the reinforcing member attachment plate portion 31A, the pillar attachment plate portion 31B, and the front and rear side plate portions 31C and 31D. Therefore, the connecting member 31 can obtain high strength against loads from various directions without increasing the plate thickness, and can improve handling, reduce costs, and the like. Moreover, the connecting member 31 can be firmly attached to the floor board reinforcing member 29, and the rigidity of the cab box 12 can be further enhanced by the reinforcing device 28.

  Furthermore, since the floor board reinforcing member 29 is configured to support the driver's seat 35 together with the pedestal 32, the floor board 27 does not need to be provided with a dedicated space for installing the reinforcing device 28. Thereby, the space in the cab 11 can be widened, and the strength of the cab 11 can be increased.

  In the embodiment, the connecting member 31 of the reinforcing device 28 has been described as an example in which the connecting member 31 is attached to the pillar portion 20A of the center pillar 20 in a surface contact state. However, the present invention is not limited to this. For example, as in the reinforcing device 41 according to the first modification shown in FIG. The member 43 is good also as a structure attached so that the pillar part 20A of the center pillar 20 may be pinched | interposed by front and back side board part 43C, 43D. In this case, the attachment strength of the connecting member 43 to the center pillar 20 can be increased.

  In the embodiment, the connecting member 31 of the reinforcing device 28 is configured to be attached to the three surfaces of the floor plate reinforcing member 29 so that the floor plate reinforcing member 29 is sandwiched between the front and rear side plate portions 31C and 31D. Explained with an example. However, the present invention is not limited to this. For example, like the reinforcing device 51 according to the second modification shown in FIG. 10, the rear side plate portion is omitted, and the reinforcing member mounting plate portion 52A and the front side plate portion 52C of the connecting member 52 are provided. It is good also as a structure attached to two surfaces of the floor board reinforcement member 29 by.

  In the embodiment, the connecting member 31 of the reinforcing device 28 is an example in which the reinforcing member attaching plate portion 31A and the pillar attaching plate portion 31B are fixed to the front and rear side plate portions 31C and 31D by welding means. And explained. However, the present invention is not limited to this. For example, the connecting member may be integrally formed using a means such as casting.

  In the embodiment, the reinforcing device 28 is configured to connect the floor plate reinforcing member 29 and the connecting member 31 with the bolt 30. However, this invention is not restricted to this, For example, it is good also as a structure which forms a floor board reinforcement member and a connection member integrally.

  In the embodiments, the cab 11 of the crawler excavator 1 is described as an example of the cab for construction machinery. However, the present invention is not limited to this. For example, the cab 11 according to this embodiment may be applied to a hydraulic excavator provided with a wheel-type lower traveling body. Furthermore, it can be widely applied to cabs of other construction machines such as hydraulic cranes, wheel loaders, tractors, and the like.

1 is a front view showing a hydraulic excavator to which a cab for construction equipment according to an embodiment of the present invention is applied. It is an enlarged front view which expands and shows the cab in FIG. It is a partially broken external perspective view showing a reinforcing device provided between a floor plate and a center pillar by breaking a cab. FIG. 4 is an enlarged cross-sectional view of the cab as seen from the direction of arrows IV-IV in FIG. 2. FIG. 5 is an enlarged longitudinal sectional view of the cab as seen from the direction of arrows V-V in FIG. 3 when the reinforcing device is attached to the floor plate and the center pillar. It is a perspective view of the principal part expansion which shows the state which attached the reinforcement apparatus to the floor board and the center pillar. It is a disassembled perspective view of the principal part expansion shown in the state which decomposed | disassembled the floor board, the center pillar, the floor board reinforcement member, and the connection member. FIG. 6 is an enlarged vertical cross-sectional view of a state in which a floor board with a floor board reinforcing member or the like attached to a cab box is viewed from the same position as in FIG. 5. It is a principal part expansion perspective view which shows the reinforcement apparatus by the 1st modification of this invention. It is a principal part expansion perspective view which shows the reinforcement apparatus by the 2nd modification of this invention.

Explanation of symbols

1 Excavator (construction machine)
DESCRIPTION OF SYMBOLS 5 Revolving frame 11 Cab 12 Cab box 12A Front surface part 12B Rear surface part 12C Left side surface part 12D Right side surface part 12E Top surface part 20 Center pillar 20A Pillar part 27 Floor board 28, 41, 51 Reinforcing device (reinforcing means)
29, 42 Floor plate reinforcing member 29A Front vertical surface portion 29B Rear vertical surface portion 29C Upper horizontal surface portion 30 Bolt 31, 43, 52 Connecting member 31A, 43A, 52A Reinforcing member mounting plate portion 31B, 43B, 52B Pillar mounting plate portion 31C, 43C, 52C Front plate portion 31D, 43D Rear plate portion 32 Base 35 Driver's seat G1 Gap between the left end of the floor plate reinforcing member and the center pillar

Claims (6)

A cab box provided on a frame of a construction machine and having a front surface portion, a rear surface portion, a left side surface portion, a right side surface portion, and a top surface portion, a floor plate covering the cab box from below, and an operator seated on the floor plate With a driver seat,
In the cab for a construction machine configured to provide a center pillar that is located in the middle of the front and rear directions on one of the left and right side portions of the cab box and extends upward and downward,
The floor board is provided with reinforcing means for supporting the center pillar of the cab box at one end of the left and right directions, located in the middle of the front and rear directions and extending in the left and right directions. Features a cab for construction machinery.   The reinforcing means includes a floor board reinforcing member provided on the floor board so as to extend left and right, and a connecting member that connects the one end of the floor board reinforcing member and the center pillar of the cab box. The cab for construction machinery according to claim 1 formed.   The floor plate reinforcing member of the reinforcing means has a front and rear vertical surface and an upper horizontal surface and is formed to extend in the left and right directions, and the connecting member is a front vertical surface and a rear vertical surface of the floor plate reinforcing member. The cab for construction machinery according to claim 2, wherein the cab is fixed to at least two of the upper lateral surfaces.   4. The cab for construction machinery according to claim 2, wherein the floor plate reinforcing member of the reinforcing means is configured such that the one end is disposed with a gap from the center pillar of the cab box.   The connecting member of the reinforcing means includes a reinforcing member mounting plate portion that extends in the left and right directions and is attached to the floor plate reinforcing member, and a pillar that extends upward from one end of the reinforcing member mounting plate portion and is attached to the center pillar of the cab box. A side plate portion fixed to a mounting plate portion, an end edge portion of the reinforcing member mounting plate portion, and an end edge portion of the pillar mounting plate portion, and attached to the floor plate reinforcing member on a different surface from the reinforcing member mounting plate portion. The cab for construction machines according to claim 2, 3 or 4, comprising:   The construction machine according to claim 1, 2, 3, 4 or 5, wherein a pedestal is provided on the floor plate in front of the reinforcing means, and the driver's seat is supported by the reinforcing means and the pedestal. Cab.

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