JP2007216957A - Cab for construction machinery - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To enhance mounting strength when fixing right and left front pillars and rear pillars to a base frame. <P>SOLUTION: Front mount bases 14, 15 at lower corner portions under a cab 11 are constituted by base plates 14A, 15A and fitting joint projections 14B, 15B, and rear mount bases 16, 17 are constituted by base plates 16A, 17A and fitting joint projections 16B, 17B. In contrast, the front pillars 22, 23 are provided with notched portions 22B, 23B to which the fitting joint projections 14B, 15B are fitted. The rear pillars 24, 25 are provided with notched portions 24A, 25A to which the fitting joint projections 16B, 17B are fitted. Accordingly, a weld can be formed along and between the fitting joint projections 14B, 15B, 16B, 17B and notched portions 22B, 23B, 24A, 25A, so as to increase the welding distance and to enhance the mounting strength. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a cab for construction machinery that is suitably used for, for example, a hydraulic excavator, a hydraulic crane, and the like.

  Generally, a hydraulic excavator as a construction machine includes a lower traveling body, an upper revolving body that is turnably mounted on the lower traveling body, and a working device that is provided so as to be able to move up and down at a front portion of the upper revolving body. It is roughly constituted by. Further, a cab serving as a driver's cab in which an operator gets in is provided on the turning frame of the upper turning body.

  For this reason, this type of excavator cab is formed in a box shape to protect the operator. As one of these excavator cabs, there are a mounting base having fitting protrusions arranged at the front, rear, left, and right corners and projecting upward, and each mounting base is moved to the front, rear, and left. , Connecting frame to connect to the right, left and right front pillars attached to the left front and right front mounting bases, left and right rear pillars attached to the left rear and right rear mounting bases, and the front pillars And left and right roof pillars that connect the upper part of the rear pillar in the front and rear directions, the left and right front pillars are connected to the left and the front connection frame that connects the right and left directions, and the left and right rear pillars are connected to the left. A box-like shape is known which is formed by a rear connection frame connected in the right direction (see, for example, Patent Document 1).

JP 2000-198469 A

  When assembling the cab according to the prior art, the lower ends of the left and right front pillars and the rear pillar are put on the fitting protrusions of the mounting base, and in this state, the periphery of the lower end of the pillar is fixed to the mounting base by welding means. The front pillars and rear pillars are erected on the mounting base.

  By the way, in the construction machine cab according to the above-described prior art, a fitting projection is provided on the mounting base, and the fitting projection is covered with the lower ends of the front pillar and the rear pillar, and welding is performed around the lower end of each pillar. By applying, the pillar is erected on the mounting base.

  However, when welding the lower end of the pillar against the mounting base, welding can only be performed around the lower end of the pillar, so the distance that can be welded is limited and the strength against welding is increased. There is a problem that can not be. Further, since the stress is concentrated at the base portion of the pillar that is erected, the welded portion formed around the lower end portion of the pillar may be damaged by the stress concentration, leading to a problem of reduced reliability. is there.

  The present invention has been made in view of the above-described problems of the prior art, and an object of the present invention is to facilitate positioning work when attaching left and right front pillars and rear pillars to a mounting base, and to improve mounting strength. An object of the present invention is to provide a cab for construction machinery that can be increased.

  The construction machine cab according to the invention of claim 1 includes a mounting base having fitting protrusions arranged at the front, rear, left, and right corners and projecting upward, and each mounting base is moved to the front, rear, and left, Connection frame that connects to the right, left and right front pillars attached to the left front and right front mounting bases, left and right rear pillars attached to the left rear and right rear mounting bases, and the front pillars Left and right roof pillars that connect the upper part of the rear pillar in the front and rear directions, left and right front pillars that are connected to the left and right front connection frames, and left and right rear pillars that are connected to the left and right And a rear connection frame connected in the direction.

  In order to solve the above-described problem, the invention adopts the feature of the first aspect of the invention in that a front pillar and a lower pillar of the rear pillar are provided with a notch portion into which a fitting projection of the mounting base is fitted. A structure in which the front pillar and the rear pillar are fixed to the mounting base by performing welding along the notch portion and the fitting protrusion in a state where the lower end side of the pillar and the rear pillar is fitted to the fitting protrusion of the mounting base. It is to have done.

  With this configuration, the front pillars and the rear pillars can be easily and accurately positioned by fitting the front pillars and the rear pillars with the fitting protrusions of the mounting base. Moreover, since welding can be performed between the fitting protrusion and the notch portion, that is, along the contact portions, the welding distance at this time can be increased, and the root portion where stress is concentrated It is possible to perform welding at a position apart from the mounting position, and it is possible to increase the attachment strength by welding.

  According to the invention of claim 2, the notches of the front pillar and the rear pillar are formed as inverted U-shaped openings having shapes corresponding to the fitting protrusions of the mounting base.

  With this configuration, when the pillar is attached to the fitting protrusion of the mounting base, the fitting protrusion fits into the notch portion of the pillar, so welding is performed between the notch portion and the fitting protrusion. As a result, the welding distance can be increased.

  According to the invention of claim 3, the mounting base is constituted by a board attached to the vehicle body side and a fitting protrusion extending upward from the board so as to cover the notch portion of the pillar.

  With this configuration, when the lower end of the pillar is fitted to the fitting protrusion of the mounting base, the fitting protrusion is fitted so as to cover the notch, so that the gap between the fitting protrusion and the notch High strength welding can be easily performed.

  According to the first aspect of the present invention, the lower ends of the front pillar and the rear pillar are provided with notches into which the fitting projections of the mounting base are fitted, and the lower ends of the front pillar and the rear pillar are fitted into the fitting projections of the mounting base. The front pillar and the rear pillar are fixed to the mounting base by welding along the notched portion and the fitting protrusion in the combined state.

  Therefore, each front pillar and rear pillar can be easily and accurately positioned by fitting with the fitting protrusions of the mounting base, so that workability and productivity during assembly work can be improved. Can be improved. Moreover, since welding can be performed between the fitting protrusion and the notch portion, that is, along the mutual contact portions, the welding distance at this time can be increased, and further, the root portion where stress is concentrated It is possible to perform welding at a position apart from the mounting position, and it is possible to increase the attachment strength by welding.

  According to the second aspect of the present invention, the cutout portions of the front pillar and the rear pillar are formed as an inverted U-shaped opening having a shape corresponding to the fitting projection of the mounting base. When the pillar is attached, the fitting protrusion can be fitted into the notch portion of the pillar, and welding is performed between the notch portion and the fitting protrusion to increase the welding distance and increase the attachment strength. be able to.

  According to the invention of claim 3, since the mounting base is constituted by the board attached to the vehicle body side and the fitting projection extending upward from the board so as to cover the notch portion of the pillar, When the lower end of the pillar is fitted to the fitting protrusion, the fitting protrusion is fitted so as to cover the notch, so that high-strength welding can be easily performed between the fitting protrusion and the notch. , Can increase the rigidity of the cab.

  Hereinafter, a construction machine cab according to an embodiment of the present invention will be described in detail with reference to FIGS.

  Reference numeral 1 denotes a lower traveling body of a hydraulic excavator, and 2 denotes an upper revolving body mounted on the lower traveling body 1 so as to be able to swivel. 3 is provided to be able to move up and down.

  The upper swing body 2 includes a swing frame 4, a cab 11 described later mounted on the left side of the front portion of the swing frame 4, and a right side to a rear side of the cab 11 as shown in FIGS. 2 and 3. The outer cover 5 provided on the revolving frame 4, the counterweight 6 attached to the rear end portion of the revolving frame 4, and the left and right directions on the revolving frame 4 located on the rear side of the cab 11. The engine 7 or the like mounted in a horizontally placed state extending in a straight line is generally configured.

  Reference numeral 11 denotes a cab mounted on the left side of the front part of the revolving frame 4. The cab 11 defines a driver's cab in which an operator gets in, and has a driver's seat and various levers (all not shown). Etc. are arranged. 4 to 6, the cab 11 includes a cab frame 12, a front window 38, a door 39, a rear panel 41, a side panel 43, a roof panel 44, a front glass 45, a rear glass 46, a left side glass 47, which will be described later. It is generally constituted by the right side glass 48 and the like.

  Reference numeral 12 denotes a cab frame that forms a framework structure of the cab 11, and as shown in FIGS. 7 and 8, the cab frame 12 includes a base frame 13, front pillars 22, 23, rear pillars 24, 25, a roof pillar 26, which will be described later. 27, front connection members 28 and 29, rear connection members 30 and 31, a front connection frame 32, a rear connection frame 33, a center pillar 35, and the like. In addition, regarding the detailed shapes of the front pillar, rear pillar, roof pillar, front connecting member, rear connecting member and the like that are symmetrical to the left and right, the respective members arranged on the right side are illustrated, and the reference numerals of the left side members are in parentheses It is described.

  Reference numeral 13 denotes a base frame of the cab 11, which is connected to left and right front mounting bases 14 and 15, left and right rear mounting bases 16 and 17, and left and right connections as shown in FIG. The frames 18 and 19 and the front and rear connection frames 20 and 21 are formed in a frame shape.

  Reference numeral 14 denotes a left front mounting base located at the front corner of the base frame 13 and arranged at the left corner, and 15 denotes a right front mounting base located at the front side of the base frame 13 and arranged at the right corner. The left front mounting base 14 and the right front mounting base 15 are formed as cast products formed by casting a steel material into a mold, for example. As shown in FIGS. 10 and 11, the front mounting bases 14 and 15 include substrates 14A and 15A formed in a substantially triangular shape, and fitting protrusions 14B and 15B protruding upward from the substrates 14A and 15A. And is integrally cast.

  Here, bolt insertion holes 14C and 15C are formed in the boards 14A and 15A, and the mounting bases 14 and 15 are attached to the vibration isolation mount that supports the cab 11 on the revolving frame 4 in the bolt insertion holes 14C and 15C. Bolts (both not shown) for fixing are inserted.

  Further, the fitting protrusions 14B and 15B are substantially rectangular vertical plate portions 14B1 and 15B1 extending upward in the front and rear directions from the substrates 14A and 15A, and front pillars described later from the vertical plate portions 14B1 and 15B1. The protrusions 14B2 and 15B2 projecting outward in the left and right directions toward the cutout portions 22B and 23B of 22, 23, and located on the opposite side to the protrusions 14B2 and 15B2, that is, inward in the left and right directions. The vertical plate portions 14B1 and 15B1 and the substrate 14A and 15A are provided with substantially triangular reinforcing ribs 14B3 and 15B3. Further, the fitting protrusions 14B and 15B need to be fitted to the lower ends of the front pillars 22 and 23. For this reason, the fitting protrusions 14B and 15B are formed as protrusions that are inclined forward and have protrusions 14B2 and 15B2 outward in the left and right directions so as to correspond to the lower side shape of the front pillars 22 and 23. Has been.

  Accordingly, the fitting protrusions 14B and 15B cover the vertical plate portions 14B1 and 15B1 so as to close the notches 22B and 23B when the lower ends of the front pillars 22 and 23 are fitted. Further, the projecting portions 14B2 and 15B2 are fitted into the notches 22B and 23B. Thereby, when welding is performed between the vertical plate portions 14B1 and 15B1, the projecting portions 14B2 and 15B2, and the cutout portions 22B and 23B, the welding distance can be increased, and the mounting bases 14 and 15 and the front pillar 22 can be increased. , 23 can be fixed by high-strength welding. Furthermore, the reinforcing ribs 14B3 and 15B3 enhance the strength against the vertical plate portions 14B1 and 15B1, the projecting portions 14B2 and 15B2, and the front pillars 22 and 23 falling down.

  16 is a left rear mounting base located at the rear corner of the base frame 13 and disposed at the left corner, and 17 is a right rear mounting base located at the rear corner of the base frame 13 and disposed at the right corner. Each of the left rear mounting base 16 and the right rear mounting base 17 is formed as a cast product, for example, like the front mounting bases 14 and 15. As shown in FIGS. 12 and 13, each of the rear mounting bases 16 and 17 includes substrates 16A and 17A formed in a substantially triangular shape, and fitting protrusions 16B and 17B protruding upward from the substrates 16A and 17A. And is integrally cast.

  Here, the board 16A, 17A is provided with bolt insertion holes 16C, 17C through which bolts (both not shown) for fixing the mounting bases 16, 17 to the vibration isolation mount on the revolving frame 4 side are inserted. Has been. The fitting protrusions 16B and 17B are fitted so as to cover notches 24A and 25A of rear pillars 24 and 25, which will be described later, and are formed as protrusions having a semicircular cross section extending substantially straight upward and downward. Has been.

  Reference numeral 18 denotes a left connection frame, and the left connection frame 18 is connected to the board 14A of the left front mounting base 14 and the board 16A of the left rear mounting base 16. Reference numeral 19 denotes a right connection frame. The right connection frame 19 is connected to the board 15A of the right front mounting base 15 and the board 17A of the right rear mounting base 17. Reference numeral 20 denotes a front connection frame, and the front connection frame 20 is connected to the board 14A of the left front mounting base 14 and the board 15A of the right front mounting base 15. A rear connection frame 21 is connected to the board 16A of the left rear mounting base 16 and the board 17A of the right rear mounting base 17. Each of the connection frames 18, 19, 20, and 21 is formed by bending the plate body into an L shape along the length direction.

  Reference numeral 22 denotes a left front pillar located at the front corner of the base frame 13 and arranged at the left corner, and reference numeral 23 denotes a right front pillar located at the front side of the base frame 13 and arranged at the right corner. Here, the left front pillar 22 and the right front pillar 23 use, for example, a cylindrical steel pipe, and the deformed steel pipe formed by drawing the steel pipe is curved in a substantially convex curve shape toward the front side. It is formed by. Each of the front pillars 22 and 23 is integrally formed with roller grooves 22A and 23A for guiding a front window 38, which will be described later, on the inner surfaces in the left and right directions when assembled.

  Further, as shown in FIGS. 10 and 11, notches 22B and 23B into which the fitting protrusions 14B and 15B of the front mounting bases 14 and 15 are fitted are formed at the lower ends of the front pillars 22 and 23, respectively. Yes. Here, the notch 22B is formed on the right side of the left front pillar 22 and the notch 23B is formed on the left side of the right front pillar 23 so as to face each other. Further, the notches 22B and 23B have a substantially inverted U shape with the lower side opened so as to correspond to the fitting protrusions 14B and 15B, and more specifically, the fitting protrusions 14B and 15B constituting the front mounting bases 14 and 15 are formed. The protrusions 14B2 and 15B2 are fitted and formed as substantially rectangular cutouts closed by the vertical plate portions 14B1 and 15B1.

  Of the left and right front pillars 22 and 23 configured as described above, for example, the right front pillar 23 is attached at its lower end to the fitting protrusion 15B of the right front mounting base 15. At this time, since the fitting protrusion 15B is fitted to the notch 23B so as to be closed, both are fixed by welding means in this state. Here, when the right front pillar 23 and the right front mounting base 15 are fixed by welding means, the lower end portion of the right front pillar 23 and the substrate 15A of the right front mounting base 15 are welded, and the notch portion 23B and Welding is performed between the fitting protrusions 15B (vertical plate portions 15B1 and protruding portions 15B2), that is, along the contact portions. Thereby, the concentration of stress on the welded portion can be avoided, the welding distance can be increased, and the strength by welding can be increased. The mounting structure of the left front pillar 22 and the left front mounting base 14 is the same.

  Reference numeral 24 denotes a left rear pillar located at the rear corner of the base frame 13 and arranged at the left corner, and reference numeral 25 denotes a right rear pillar located at the rear side of the base frame 13 and arranged at the right corner. Here, as with the front pillars 22 and 23, the left rear pillar 24 and the right rear pillar 25 are each formed of a deformed steel pipe using, for example, a cylindrical steel pipe and drawing the steel pipe. .

  Further, as shown in FIGS. 12 and 13, notches 24A and 25A into which the fitting protrusions 16B and 17B of the rear mounting bases 16 and 17 are fitted are formed at the lower ends of the rear pillars 24 and 25, respectively. . Here, the notch 24A is formed on the right side of the left rear pillar 24, and the notch 25A is formed on the left side of the right rear pillar 25 so as to face each other. Further, the notches 24A and 25A have a substantially inverted U shape with the lower side opened so as to correspond to the fitting protrusions 16B and 17B, and the fitting protrusions 16B and 17B of the rear mounting bases 16 and 17 are fitted. It is formed as a substantially rectangular cutout that is closed.

  Of the left and right rear pillars 24 and 25 configured as described above, for example, the right rear pillar 25 is fitted with the notch 25A to the fitting protrusion 17B of the right rear mounting base 17, and is fixed by welding means in this state. ing. Here, when the right rear pillar 25 and the right rear mounting base 17 are fixed by welding means, the lower end portion of the right rear pillar 25 and the substrate 17A of the right rear mounting base 17 are welded and fitted to the notch portion 25A. Welding is performed between the protrusions 17B, that is, along the contact portions. Thereby, the concentration of stress on the welded portion can be avoided, the welding distance can be increased, and the strength by welding can be increased. The mounting structure of the left rear pillar 24 and the left rear mounting base 16 is the same.

  26 is a left roof pillar that extends forward and rearward from the upper part of the left front pillar 22 and left rear pillar 24, and 27 is a right that extends forward and rearward from the upper part of the right front pillar 23 and the right rear pillar 25. Each of the roof pillars is shown, and the left roof pillar 26 and the right roof pillar 27 are gently curved so that the middle portion in the length direction protrudes upward. The left roof pillar 26 and the right roof pillar 27 are integrally formed with roller grooves 26A and 27A on the inner surfaces in the left and right directions.

  Here, the left roof pillar 26 and the right roof pillar 27 use deformed steel pipes similar to the left front pillar 22 and the right front pillar 23 described above, and are formed by bending the deformed steel pipes and bending them. . The front end of the left roof pillar 26 is attached to the upper end of the left front pillar 22 via a left front connecting member 28 described later, and the rear end of the left roof pillar 26 is connected to the upper end of the left rear pillar 24 via a left rear connecting member 30 described later. Attached to the part. On the other hand, the front end of the right roof pillar 27 is attached to the upper end of the right front pillar 23 via a right front connecting member 29 described later, and the rear end is connected to the upper end of the right rear pillar 25 via a right rear connecting member 31 described later. Attached to the part.

  28 denotes a left front connecting member provided between the left front pillar 22 and the left roof pillar 26, and 29 denotes a right front connecting member provided between the right front pillar 23 and the right roof pillar 27. The connecting member 28 and the right front connecting member 29 have a rectangular tube shape that is curved in an arc shape.

  Here, the left front connecting member 28 is formed with a roller groove 28A continuous with the roller groove 22A of the left front pillar 22 and the roller groove 26A of the left roof pillar 26 on the inner surface in the left and right directions. On the other hand, the right front connecting member 29 is formed with a roller groove 29A continuous with the roller groove 23A of the right front pillar 23 and the roller groove 27A of the right roof pillar 27 on the inner surface in the left and right directions.

  The left front connecting member 28 has one end fitted to the upper end of the left front pillar 22 and fixed by welding means, and the other end fitted to the front end of the left roof pillar 26 and fixed by welding means. Thus, the left front pillar 22 and the left roof pillar 26 can be connected using the left front connecting member 28. On the other hand, one end side of the right front connecting member 29 is fitted to the upper end of the right front pillar 23 and fixed by welding means, and the other end side is fitted to the front end of the right roof pillar 27 and fixed by welding means. Accordingly, the right front pillar 23 and the right roof pillar 27 can be connected using the right front connecting member 29.

  Next, 30 is a left rear connecting member provided between the left rear pillar 24 and the left roof pillar 26, and 31 is a right rear connecting member provided between the right rear pillar 25 and the right roof pillar 27. The rear connecting member 30 and the right rear connecting member 31 are formed in a box shape having a hollow inside.

  The left rear connecting member 30 is fitted to the rear end of the left roof pillar 26 by the front side and fixed by welding means, and the lower surface side is fitted to the upper end of the left rear pillar 24 and fixed by welding means. Thereby, the left rear pillar 24 and the left roof pillar 26 can be connected by using the left rear connecting member 30. On the other hand, the right rear connecting member 31 is fitted to the rear end of the right roof pillar 27 by the front side and fixed by welding means, and the lower surface side is fitted to the upper end of the right rear pillar 25 and fixed by welding means. Thus, the right rear pillar 25 and the right roof pillar 27 can be connected using the right rear connecting member 31.

  Reference numeral 32 denotes a front connection frame (shown in FIG. 7) provided on the upper front side of the cab frame 12, and the front connection frame 32 is formed of a long plate extending in the left and right directions. The front connection frame 32 is fixed to the left and right front connection members 28 and 29 by welding means at attachment portions at both ends. Thus, the front connection frame 32 connects the upper sides of the front pillars 22 and 23 in the left and right directions via the front connection members 28 and 29.

  Reference numeral 33 denotes a rear connection frame provided on the upper rear portion of the cab frame 12, and the rear connection frame 33 has, for example, a long rectangular tube shape extending in the left and right directions. The rear connection frame 33 is secured to the left and right rear connection members 30 and 31 by welding means at the both ends. Thus, the rear connection frame 33 connects the upper sides of the rear pillars 24 and 25 in the left and right directions via the rear connection members 30 and 31.

  Reference numeral 34 denotes an intermediate rear connection frame positioned at the rear of the cab frame 12 and spaced apart from the lower side of the rear connection frame 33. The intermediate rear connection frame 34 folds a plate body extending leftward and rightward. It is formed in a rod shape by bending. The intermediate rear connecting frame 34 is fixed to the upper and lower intermediate portions of the left and right rear pillars 24 and 25 by welding means at both ends, whereby the intermediate portions of the rear pillars 24 and 25 are moved to the left and right directions. It is linked to.

  Reference numeral 35 denotes a center pillar provided on the left side surface side of the cab frame 12. The center pillar 35 is hollow by fixing an inner panel 36 and an outer panel 37, which are pressed into a substantially L shape, by welding means. It is formed as a plate. The center pillar 35 includes a pillar portion 35A that extends upward and downward, and a side panel portion 35B that extends rearward from the lower side of the pillar portion 35A.

  In the center pillar 35 configured as described above, the pillar portion 35A is disposed at an intermediate position in the front and rear directions, and the lower ends of the pillar portion 35A and the side panel portion 35B are welded to the left connection frame 18 of the base frame 13. The upper end of the pillar portion 35A is fixed to the left roof pillar 26 by welding means.

  Reference numeral 38 denotes a front window provided on the front side of the cab frame 12. The front window 38 includes roller grooves 23A of the front pillars 22 and 23, roller grooves 27A of the roof pillars 26 and 27, and rollers of the front connecting members 28 and 29. It is provided so as to be movable along the groove 29A. Thus, the front window 38 is normally disposed between the left and right front pillars 22 and 23 as shown in FIG. 6 and covers the front side. On the other hand, when it is lifted upward and opened, it is accommodated between the left and right roof pillars 26 and 27, that is, below the roof panel 44 described later.

  Reference numeral 39 denotes a door provided between the center pillar 35 and the left front pillar 22. As shown in FIG. 4, the door 39 is hinged to the center pillar 35 so that it can be opened and closed via hinges 40 and 40. ing.

  Reference numeral 41 denotes a rear panel made of a metal plate. The rear panel 41 is provided across the left and right rear pillars 24 and 25 so as to cover the rear surface side of the cab frame 12. Reference numeral 42 denotes a corner panel made of a metal plate, and the corner panel 42 is provided so as to cover the left rear pillar 24. Reference numeral 43 denotes a side panel made of a metal plate. The side panel 43 is fixed to the right connection frame 19, the right front pillar 23, and the right rear pillar 25 so as to cover the right side surface side of the cab frame 12. Reference numeral 44 denotes a roof panel made of a metal plate. The roof panel 44 is fixed to the left and right roof pillars 26 and 27, the front connection frame 32, and the rear connection frame 33.

  Reference numeral 45 denotes a lower windshield. The lower windshield 45 is located on the lower side of the front window 38 and is attached to the front connection frame 20 and the left and right front pillars 22 and 23. 46 is a rear glass, and the rear glass 46 is located between the rear connecting frame 33 and the rear panel 41 and is attached to the left and right rear pillars 24 and 25. The left side glass 47 is provided between the center pillar 35 and the corner panel 42. Reference numeral 48 denotes a right side glass, and the right side glass 48 is provided between the right front pillar 23 and the right rear pillar 25.

  The hydraulic excavator according to the present embodiment has the above-described configuration, and the operation thereof will be described next.

  First, at a work site or the like, for example, the lower traveling body 1 is moved forward and backward by an operator tilting the traveling lever in the cab 11. When performing excavation work or the like of earth and sand, the working device 3 is operated by tilting the working lever, or the upper swing body 2 is swung.

  Next, as a procedure for assembling the cab 11, first, an operation procedure for attaching the front pillars 22 and 23 to the front mounting bases 14 and 15 of the base frame 13 will be described.

  First, as shown by the arrows in FIG. 11, the front pillars 22 and 23 are attached so that the fitting protrusions 14B and 15B of the front mounting bases 14 and 15 are fitted into the notches 22B and 23B. At this time, the front pillars 22 and 23 can be easily and accurately positioned with respect to the front mounting bases 14 and 15 by fitting the notches 22B and 23B into the fitting protrusions 14B and 15B.

  When the front pillars 22 and 23 are assembled to the front mounting bases 14 and 15, as shown in FIG. 10, the contact portions between the lower ends of the front pillars 22 and 23 and the substrates 14 A and 15 A of the front mounting bases 14 and 15. Weld each. Further, the front pillars 22 and 23 are fixed to the front mounting bases 14 and 15 by welding between the notches 22B and 23B and the fitting protrusions 14B and 15B, that is, along the contact portions.

  In this way, welding is also performed on the abutting portions between the cutout portions 22B and 23B and the fitting protrusions 14B and 15B, so that a portion where stress is likely to be concentrated can be avoided, and the welding distance can be applied. Therefore, it is possible to increase the mounting strength by welding.

  On the other hand, in the operation of attaching the rear pillars 24 and 25 to the rear mounting bases 16 and 17, the fitting protrusions 16B and 17B of the rear mounting bases 16 and 17 are fitted into the notches 24A and 25A as shown by arrows in FIG. Install the rear pillars 24 and 25 as shown. At this time, the notches 24A and 25A are fitted into the fitting protrusions 16B and 17B, so that the rear pillars 24 and 25 can be easily and accurately positioned with respect to the rear mounting bases 16 and 17.

  When the rear pillars 24 and 25 are assembled to the rear mounting bases 16 and 17, as shown in FIG. 12, the abutting portions between the lower ends of the rear pillars 24 and 25 and the substrates 16A and 17A of the rear mounting bases 16 and 17 are welded. To do. Further, the rear pillars 24 and 25 are fixed to the rear mounting bases 16 and 17 by welding along the contact portions between the notches 24A and 25A and the fitting protrusions 16B and 17B.

  In this way, welding is also performed on the contact portions between the cutout portions 24A and 25A and the fitting protrusions 16B and 17B, so that the welding operation between the front mounting bases 14 and 15 and the front pillars 22 and 23 is performed. The mounting strength by welding can be increased.

  Next, the roof pillars 26 and 27 are attached to the upper ends of the front pillars 22 and 23 and the rear pillars 24 and 25 via the front connecting members 28 and 29 and the rear connecting members 30 and 31, respectively. The front connecting members 28 and 29 are connected by a front connecting frame 32, and the rear connecting members 30 and 31 are connected by a rear connecting frame 33. Further, the cab frame 12 is assembled by attaching a center pillar 35 to the left connecting frame 18 and the left roof pillar 26 of the base frame 13.

  When the cab frame 12 is assembled in this way, the front frame 38, door 39, rear panel 41, corner panel 42, side panel 43, roof panel 44, windshield 45, rear glass 46, left side glass 47, right The cab 11 can be assembled by sequentially attaching the side glass 48 and the like.

  Thus, according to the present embodiment, each of the mounting bases 14, 15, 16, 17 is formed by integrally casting the substrates 14A, 15A, 16A, 17A and the fitting protrusions 14B, 15B, 16B, 17B. Since they are formed, the pillars 22, 23, 24, 25 can be attached to the attachment bases 14, 15, 16, 17 by fitting them into the fitting protrusions 14B, 15B, 16B, 17B. Accordingly, the fitting protrusions 14B, 15B, 16B, and 17B can easily and accurately position the pillars 22, 23, 24, and 25 at predetermined positions on the base frame 13, so that the workability and production during assembly work are improved. Can be improved.

  Moreover, since the notches 22B, 23B, 24A, 25A are provided at the lower ends of the pillars 22, 23, 24, 25, the notches 22B, 23B, 24A, 25A and the mounting bases 14, 15, 16 are provided. , 17 fitting protrusions 14B, 15B, 16B, 17B can be fixed by welding means. Therefore, the lower ends of the pillars 22, 23, 24, 25 are welded at the positions of the contact portions between the notches 22B, 23B, 24A, 25A and the fitting protrusions 14B, 15B, 16B, 17B. Can do.

  As a result, welding can be performed while avoiding the base portions of the pillars 22, 23, 24, and 25 where stress tends to concentrate, and the welding distance can be increased along the notches 22B, 23B, 24A, and 25A. Therefore, the mounting strength by welding can be increased and the reliability can be improved.

  Moreover, since the bolt insertion holes 14C, 15C, 16C, and 17C are provided in the mounting bases 14, 15, 16, and 17, the bolts are inserted into the bolt insertion holes 14C, 15C, 16C, and 17C, and the bolts are turned. By attaching the anti-vibration mount on the frame 4, the cab 11 can be supported on the revolving frame 4.

  On the other hand, since the front mounting bases 14 and 15 and the rear mounting bases 16 and 17 are formed as cast products obtained by casting a steel material into a mold, the mounting bases 14, 15, 16 and 17 are formed on the substrate 14A. , 15A, 16A, 17A and the fitting protrusions 14B, 15B, 16B, 17B can be integrally cast, and can be manufactured at low cost.

  Further, the left and right front pillars 22 and 23, the rear pillars 24 and 25, and the like are formed by using hollow steel pipes that are formed as deformed steel pipes by drawing, so that the front pillars 22, 23, The rear pillars 24 and 25 can be formed inexpensively and easily.

  In the embodiment, when the cab 11 is assembled, after the base frame 13 is formed by the mounting bases 14, 15, 16, 17 and the connection frames 18, 19, 20, 21, the front pillar is attached to the base frame 13. The case where 22, 23, rear pillars 24, 25, etc. are attached has been described as an example. However, the present embodiment is not limited to this, and may be assembled as in the modification shown in FIG. 14, for example. That is, the left portion of the cab 11 is assembled by the left mounting bases 14 and 16, the connection frame 18, the front pillar 22, the rear pillar 24, the roof pillar 26, the center pillar 35, and the like, and the right portion of the cab 11 is the right mounting base 15. , 17, connection frame 19, front pillar 23, rear pillar 25, roof pillar 27, etc. Thereafter, these assemblies may be connected by the connection frames 20 and 21, the front connection frame 32, the rear connection frames 33 and 34, the rear panel 41, the roof panel 44, and the like.

  In the embodiment, the front pillars 22 and 23 and the roof pillars 26 and 27 are connected via the front connecting members 28 and 29, and the rear pillars 24 and 25 and the roof pillars 26 and 27 are connected via the rear connecting members 30 and 31. However, the present invention is not limited to this. For example, the front pillar and the roof pillar, or the rear pillar and the roof pillar may be directly fixed by welding means or the like.

  Further, in the embodiment, the front mounting bases 14 and 15 and the rear mounting bases 16 and 17 are described as being formed as cast products obtained by casting a steel material into a mold, but the present invention is not limited to this, The mounting bases 14, 15, 16, and 17 may be formed by forging, cutting, or the like.

  Furthermore, in the embodiment, the cab 11 of the hydraulic excavator has been described as an example of the cab for the construction machine. However, the present invention is not limited thereto, and may be applied to another cab for a construction machine such as a hydraulic crane. Can do.

It is a front view which shows the hydraulic excavator applied to embodiment of this invention. It is a left view which expands and shows a hydraulic excavator in the state which omitted the working device. FIG. 3 is a plan view of the hydraulic excavator shown in FIG. 2. It is a front view which expands and shows the cab in FIG. It is a left view of the cab shown in FIG. It is sectional drawing of the cab seen from the arrow VI-VI direction in FIG. It is an external appearance perspective view which shows a cab frame. It is a disassembled perspective view which shows a cab frame. It is an external appearance perspective view which expands and shows a base frame alone. It is an external appearance perspective view which expands and shows the state which attached the front pillar to the front attachment base. It is a disassembled perspective view which expands and shows a front mounting base and a front pillar in a disassembled state. It is an external appearance perspective view which expands and shows the state which attached the rear pillar to the rear mounting base. It is a disassembled perspective view which expands and shows a rear mounting base and a rear pillar in an exploded state. It is a disassembled perspective view of the cab frame which shows the assembly order of the cab by the modification of this invention.

Explanation of symbols

11 cab 13 base frame 14 left front mounting base 14A, 15A, 16A, 17A board 14B, 15B, 16B, 17B fitting protrusion 14B1, 15B1 vertical plate portion 14B2, 15B2 protruding portion 14B3, 15B3 reinforcing ribs 14C, 15C, 16C , 17C Bolt insertion hole 15 Right front mounting base 16 Left rear mounting base 17 Right rear mounting base 18 Left connection frame 19 Right connection frame 20 Front connection frame 21 Rear connection frame 22 Left front pillar 22B, 23B, 24A, 25A Notch 23 Right front pillar 24 Left rear pillar 25 Right rear pillar 26 Left roof pillar 27 Right roof pillar 32 Front connection frame 33 Rear connection frame

Claims (3)

Mounting bases with fitting projections that are arranged at the front, rear, left, and right corners and project upward, connecting frames that connect the mounting bases to the front, rear, left, and right, and front left, front right Left and right front pillars attached to the mounting base, left and right rear pillars attached to the left rear and right rear mounting bases, and left connecting the front and rear pillars in the front and rear directions. , Construction with a right roof pillar, a front connection frame that connects the upper side of the left and right front pillars in the left and right directions, and a rear connection frame that connects the upper side of the left and right rear pillars in the left and right directions In the machine cab,
At the lower end of the front pillar and the rear pillar, a notch for fitting the fitting projection of the mounting base is provided,
The front pillar and the rear pillar are attached to the mounting base by performing welding along the notch and the fitting protrusion in a state where the lower ends of the front pillar and the rear pillar are fitted to the fitting protrusion of the mounting base. A construction machine cab characterized by being configured to adhere.   The cab for construction machines according to claim 1, wherein the notches of the front pillar and the rear pillar are formed as an inverted U-shaped opening having a shape corresponding to the fitting protrusion of the mounting base.   3. The construction machine according to claim 1, wherein the attachment base is configured by a board attached to a vehicle body side and the fitting protrusion extending upward from the board so as to cover a notch portion of the pillar. Cab.

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