JP2007083786A - Cab and working machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cab enhancing strength relative to side load while suppressing cost. <P>SOLUTION: Freedom of molding of a front header 28 is enhanced as compared with the case where the front header is formed, for example, by a panel structure or the like by forming the front header 28 by forging or casting. By forming the front header 28 to a desired shape, strength of the front header 28 is enhanced, strength relative to the side load of the cab 6 is also enhanced and cost is suppressed as compared with, for example, the case where a reinforcement member or the like is separately mounted to the front header. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a box-shaped cab that is adjacent to a work device and opens a front window portion in a front side surface portion and opens an upper window portion in a ceiling portion, and a work machine including the same.

  Conventionally, for example, a box-shaped cab mounted on a machine body of a work machine such as a hydraulic excavator is provided with a front cross member between lower portions of left and right front pillars rising from both sides of a front portion of a floor surface portion and between upper portions. A front header is provided, and a front window is formed in the front side surface by the front pillar, the front cross member, and the front header.

  Further, the upper ends of the front pillars are bent rearward to form left and right side portions, and the rear end portions of these side portions are connected to the upper end portions of the left and right rear pillars rising from both sides of the rear portion of the floor surface portion, A roof panel is integrally provided at the rear of each front pillar, and a skylight opening is formed between the rear part of the front header and the front part of the roof panel (see, for example, Patent Document 1). .

  By the way, a hydraulic excavator or the like may inevitably work on rough terrain or an inclined land. When working on such a place, the hydraulic excavator may fall down due to some accident.

  In order to protect the operator against such a fall, it is necessary to reinforce a cab such as a hydraulic excavator or improve the rigidity of the cab.

  However, the cab described in Patent Document 1 described above is a combination of a plate-like inner panel formed by press molding or the like and a plate-like outer panel that becomes a decorative plate, and these panels are only combined. The strength against the lateral load applied to the cab is not sufficient.

  Furthermore, in the case of a cab such as a hydraulic excavator, it is desirable to make the area of each window as large as possible in consideration of the operator's field of view. Therefore, if the front window and the skylight are large, the space between the front window and the skylight There is a risk that the strength of the front header located in the lower position will decrease.

Accordingly, a configuration in which a reinforcing member is attached to the cab to improve the strength of the cab is also known. In such a reinforcing member, both end portions of a rod-shaped reinforcing member main body are fixed to the front pillar at both side portions of the front header (see, for example, Patent Document 2).
JP 2002-88812 A (page 5-6, FIG. 10) JP 2001-279721 A (page 4-6, FIG. 3)

  However, in the cab described in the above-mentioned Patent Document 2, it is not easy to suppress the cost because the reinforcement member is necessary, and the reinforcement member must be further attached to the cab, so that the productivity is not good. Has a problem.

  As a result, further improvement in the strength of the cab with respect to the lateral load is desired.

  This invention is made | formed in view of such a point, and it aims at providing the working machine provided with the cab which can improve the intensity | strength with respect to a side load, suppressing cost.

  The invention according to claim 1 is a box-shaped cab that is adjacent to the working device and opens a front window portion in a front side surface portion and opens an upper window portion in a ceiling portion, and includes both sides and a ceiling of the front side surface portion. A pair of front pillars that form both sides of the part, and a horizontal frame part that is formed by either forging or casting and that is disposed between the front pillars to partition the front window part and the upper window part It is.

  According to a second aspect of the present invention, in the cab according to the first aspect, the horizontal frame portion is fixed to each of the front pillars, and the fixed portions are connected to each other. And a connecting portion provided integrally therewith.

  According to a third aspect of the present invention, there is provided a machine main body, a working device operatively provided on the machine main body, and the cab according to the first or second aspect mounted on the machine main body adjacent to the working device. Work machine.

  According to the first aspect of the present invention, for example, the horizontal frame is formed by forming the horizontal frame portion disposed between the front pillars and defining the front window portion and the upper window portion by either forging or casting. Compared with the case where the part is formed with a panel structure or the like, the degree of freedom in forming the horizontal frame part is improved. By forming this horizontal frame part into a desired shape, the strength of the horizontal frame part can be improved. The strength against the load can be improved, and for example, the cost can be suppressed as compared with the case where the reinforcing member is separately attached to the horizontal frame portion.

  According to the invention of claim 2, by fixing the fixed parts that are integrally connected to each other at the connecting part to each of the front pillars, the strength in the vicinity of the horizontal frame part including the horizontal frame part can be improved, The cab can be reinforced more reliably against side loads.

  According to the invention described in claim 3, by providing the cab that is reinforced with respect to the lateral load while suppressing the cost, the entire cost can be suppressed and the workable area can be expanded.

  Hereinafter, an embodiment of the present invention will be described in detail with reference to FIGS.

  FIG. 5 shows a hydraulic excavator 1 as a working machine. The hydraulic excavator 1 has a machine main body 5 in which an upper swing body 4 is turnably provided on an upper portion of a lower traveling body 2 via a swing portion 3. A cab 6 that surrounds the operator's operating space is mounted on the upper left side of the upper side of the upper swing body 4, and a work device 7 projects from the center of the front portion of the upper swing body 4 so as to be operable. That is, the cab 6 is located on the side of the work device 7.

  As shown in FIG. 1, the cab 6 has a substantially rectangular floor surface portion 15 that is long before and after being mounted on a revolving frame of the upper revolving structure 4 (FIG. 5) via a mount member (not shown). The left side surface portion 16 and the right side surface portion 17 rising upward from the left and right side portions of the floor surface portion 15, the front side surface portion 18 and the rear side surface portion 19 rising upward from both front and rear end portions of the floor surface portion 15, and the side surface portions 16 , 17, 18, 19 and a ceiling portion 20 provided on the top.

  The cab 6 includes a left front pillar 22 and a right front pillar 23 which are columnar bodies as front pillars provided at four corners of the floor 15, and a left rear pillar 24 and a right rear pillar 25 which are columnar bodies as rear pillars. And each. Furthermore, the upper end portion of the left front pillar 22 is bent to the upper end portion of the left rear pillar 24 to form the left side portion 26, and the upper end portion of the right front pillar 23 is bent to the upper end portion of the right rear pillar 25. A right side portion 27 is formed, the upper ends of both front pillars 22 and 23 are connected by a front header 28 as a horizontal frame portion, and the upper ends of both rear pillars 24 and 25 are connected by a rear header 29, and The lower ends of both front pillars 22 and 23 are connected by a front cross member 30, and the lower ends of both rear pillars 24 and 25 are connected by a rear cross member 31.

  On the floor 15, although not shown, a seat on which the operator sits, a console operated by the operator, and the like are appropriately arranged. The floor 15 is provided with a hole (not shown) through which various wires and pipes connected to a console and the like are led out to the lower outside of the cab 6.

  The left side surface portion 16 is defined by a left front pillar 22, a left side portion 26, and a left rear pillar 24, and a columnar body having an upper end connected to the left side portion 26 between the left front pillar 22 and the left rear pillar 24. A door mounting pillar 32 is disposed, and a door 33 that is opened and closed when the operator gets in and out of the cab 6 is provided between the door mounting pillar 32 and the left front pillar 22. In addition, a left side panel 34 is integrally provided between the door mounting pillar 32 and the left rear pillar 24. A left window 35 adjacent to the rear of the door 33 is formed in the upper part of the left side panel 34. The left window 35 is closed by a translucent member not shown.

  The right side portion 17 is partitioned by a right front pillar 23, a right side portion 27, and a right rear pillar 25, and a right side panel 36 is integrally provided between the lower portions of the right front pillar 23 and the right rear pillar 25. In the upper part of the panel 36, a right window 37 is formed. The right window 37 is closed by a translucent member (not shown).

  The front side surface portion 18 is partitioned by the front pillars 22 and 23, the front header 28, and the front cross member 30, and a front window 41 serving as a front side window portion is formed as an opening, and the front window 41 is not illustrated. It is blocked by a light member.

  The rear side surface portion 19 is partitioned by both rear pillars 24, 25 and a rear header 29, and a rear panel 43 formed of, for example, a single plate is integrally provided between the lower portions of the rear pillars 24, 25 and the upper portion of the rear cross member 31. A rear window 44 is formed in the upper portion of the rear panel 43. The rear window 44 is formed in a quadrangular shape and can be opened and closed by a translucent member (not shown).

  Here, a hat member H, which is a steel material as a mounting member, is welded to the inside of the front cross member 30 and the lower end portions of the panels 34, 36, 43, and these hat members H are bolts not shown on the floor portion 15. The side surface portions 16, 17, 18, and 19 are integrated with the floor surface portion 15 by being fixed via the.

  The ceiling portion 20 is partitioned by both headers 28 and 29 and both side portions 26 and 27, and a roof panel 47 formed of, for example, a single plate is fitted to the rear side, and the rear side is formed in a substantially flat shape. In addition, a skylight 48 as an upper window is formed in front of the roof panel 47. The skylight 48 is formed in a rectangular shape and can be opened and closed by a door body (not shown).

  The front pillars 22 and 23 are also called A pillars, the door mounting pillars 32 are also called B pillars, and the rear pillars 24 and 25 are also called C pillars. 22, 23, 24, 25, 32 are each a deformed steel pipe formed of a steel plate.

  As shown in FIG. 4, the front header 28 divides the front window 41 and the skylight 48 and deforms the cab 6 as indicated by an imaginary line C when a lateral load F is applied to the cab 6. As shown in FIGS. 1 to 3, the fixed portions 51, 52 fixed to the front pillars 22, 23 by bolting or welding, and the fixed portions 51, 52 are connected to each other. It is formed in a substantially H shape having a connecting portion 53 that is connected linearly in the left-right direction, and is integrally formed by casting or forging. Further, the front header 28 has a connecting portion between a line of sight 56 emitted from the eye point (not shown) of the operator located in the cab 6 to the upper end of the front window 41 and a line of sight 57 emitted from the front end of the skylight 48. The thickness direction of 53 is formed to be large.

  The fixed portion 51 includes an upper left plate portion 61 located on the upper side and a lower left plate portion 62 located on the lower side, and in a side view, a curved portion to the left side portion 26 of the upper end portion of the left front pillar 22 Curved so as to follow.

  The upper left plate part 61 is attached from the vicinity of the upper end of the left front pillar 22 to the left side part 26 to define the left front part of the skylight 48, and the fixed part 52 side that is the inner side is the outer side toward the upper side. It is formed so as to incline toward. For this reason, the upper left plate part 61 has a tapered shape. Furthermore, holes 64 and 65 for fixing the front header 28 to the left front pillar 22 are formed in the upper left plate 61, respectively.

  The hole 64 is cut out at one side near the upper end of the upper left plate 61 and is provided for alignment when the front header 28 is assembled to the cab 6. Further, the hole 65 is formed in a round hole shape in the vicinity of the connecting portion 53 of the upper left plate portion 61, and a bolt (not shown) is inserted and tightened.

  The lower left plate portion 62 is attached downward from the vicinity of the upper end portion of the left front pillar 22 and defines the upper left portion of the front window 41. The fixed portion 52 side that is the inner side faces outward toward the lower side. It is formed so as to be inclined. For this reason, the lower left plate portion 62 has a tapered shape.

  Similarly, the fixed portion 52 includes an upper right plate portion 71 located on the upper side and a lower right plate portion 72 located on the lower side, and to the right side portion 27 at the upper end portion of the right front pillar 23 in a side view. The curved portion is formed along the curved portion.

  The upper right plate portion 71 is attached from the vicinity of the upper end portion of the right front pillar 23 to the right side portion 27 to partition the right front portion of the skylight 48, and the fixed portion 51 side, which is the inner side, faces the upper side outward. It is formed so as to incline toward. For this reason, the upper right plate portion 71 has a tapered shape. Furthermore, holes 74 and 75 for fixing the front header 28 to the right front pillar 23 are formed in the upper right plate portion 71, respectively.

  The hole 74 is notched at one side near the upper end of the upper right plate 71 and is provided for alignment when the front header 28 is assembled to the cab 6. The hole 75 is formed in the shape of a round hole in the vicinity of the connecting portion 53 of the upper right plate 71, and a bolt (not shown) is inserted and tightened when the front header 28 is assembled to the cab 6.

  The lower right plate portion 72 is attached downward from the vicinity of the upper end portion of the right front pillar 23 to define the upper right portion of the front window 41, and the fixed portion 51 side that is the inner side faces the lower side toward the lower side. It is formed so as to incline toward. For this reason, the lower right plate part 72 has a tapered shape.

  The connecting portion 53 is continuously formed from an intermediate portion between the upper left plate portion 61 and the lower left plate portion 62 of the fixed portion 51 to an intermediate portion between the upper right plate portion 71 and the lower right plate portion 72 of the fixed portion 52. ing.

  Further, as shown in FIG. 3, the connecting portion 53 protrudes from the connecting portion main body 81, the projecting portions 82 and 83 protruding above and below the connecting portion main body 81, and the rear portion of the connecting portion main body 81. And a rear projecting portion 84 having a substantially T-shaped cross section.

  The front side of the connecting portion main body 81 forms a planar front side surface 81a.

  The projecting portions 82 and 83 project substantially symmetrically with respect to the connecting portion main body 81 in the vertical direction. In addition, an engaging portion 86 for engaging with a door body that opens and closes the skylight 48 is provided at the center of the protruding portion 82 in the left-right direction. Further, on the rear side of the whole of the projecting portions 82 and 83, concave portions 82a and 83a are formed for connecting to the rear projecting portion 84 in a curved shape. These concave portions 82a and 83a are each curved in a convex shape on the front side, and are continuously formed over the entire longitudinal direction of each of the projecting portions 82 and 83.

  The rear protruding portion 84 reinforces the connecting portion main body 81 and is continuously formed in the entire longitudinal direction across both side portions of the connecting portion main body 81 as a whole.

  Next, the function and effect of the embodiment will be described.

  When the front header 28 is assembled when the cab 6 is assembled, the hole 64 of the upper left plate 61 and the hole 74 of the upper right plate 71 are respectively connected to the side portions 26, 27 from the upper ends of the front pillars 22, 23, respectively. The front header 28 is fixed by inserting and tightening bolts into the holes 65 and 75, respectively, between the front pillars 22 and 23 and the front cross member 30. A front window 41 is defined, and a skylight 48 is defined between the side portions 26 and 27 and the roof panel 47.

  By forming the front header 28 by forging or casting, for example, the degree of freedom in forming the front header 28 is improved as compared with the case where the front header is formed by a panel structure or the like. By forming 28 in a desired shape, the strength of the front header 28 can be improved, the strength against the side load F (FIG. 4) can be improved, and the reliability of the cab 6 can be improved.

  For example, in the above-described embodiment, the concave portions 82a and 83a are provided at the rear portions of the projecting portions 82 and 83 of the coupling portion 53, so that an increase in the weight of the front header 28 is suppressed to a minimum, and the coupling portion body 81 By providing the rear projecting portion 84 at the rear portion, the connecting portion 53 can be efficiently given strength.

  For this reason, by mounting the cab 6 on the excavator 1 (FIG. 5), for example, when the excavator 1 (FIG. 5) inevitably works on rough terrain, sloping ground, etc., the hydraulic excavator is caused by some accident, for example. Even when 1 (FIG. 5) falls down (rolls over), the operator can be reliably protected and the workable area can be expanded.

  In addition, by improving the degree of freedom in forming the front header 28, the design of the cab 6 can be improved and various cabs 6 can be handled.

  In addition, the cab 6 can be reduced in cost without the need for mounting compared to the case where, for example, a reinforcing member or the like is separately mounted on the front header, and by mounting the cab 6, The overall cost can also be suppressed.

  Further, since the front header 28 is formed with a large thickness of the connecting portion 53 at a position between the line of sight 56 and 57 of the operator, the field of view of the operator is not narrowed.

  Then, by fixing the fixed portions 51 and 52 that are integrally connected to each other by the connecting portion 53 to the front pillars 22 and 23, the strength in the vicinity of the front header 28 including the front header 28 can be improved. The cab 6 can be more reliably reinforced against the side load F (FIG. 4).

  In the above-described embodiment, the cross-sectional shape of the connecting portion 53 of the front header 28 can be an arbitrary shape as long as it does not block the view from the operator.

  Further, if the front header 28 is configured such that the connecting portion 53 partitions the front window 41 and the skylight 48, the shapes of the fixed portions 51 and 52, the cross-sectional shape of the connecting portion 53, and the like can be arbitrarily set. .

  Further, the cab 6 can be applied to any work machine other than the hydraulic excavator 1.

1 is a perspective view showing an embodiment of a cab according to the present invention. It is a perspective view which shows a horizontal frame part same as the above. It is a longitudinal cross-sectional view which shows the principal part of a cab same as the above. It is a front view which shows a cab same as the above. It is a side view which shows the working machine provided with the cab same as the above.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Excavator as a working machine 5 Machine main body 6 Cab 7 Working device
18 Front side
20 Ceiling
22 Left front pillar as front pillar
23 Right front pillar as front pillar
28 Front header as horizontal frame
41 Front window as front window
48 Skylight as upper window
51, 52 Fixed part
53 Connection

Claims (3)

A box-shaped cab that is adjacent to the working device and opens the front window on the front side and the upper window on the ceiling,
A pair of front pillars forming both sides of the front side and both sides of the ceiling;
A cab formed by either one of forging and casting, and provided with a lateral frame portion disposed between the front pillars and defining a front window portion and an upper window portion. The horizontal frame is
A fixed part fixed to each front pillar,
The cab according to claim 1, further comprising a connecting portion that connects the fixed portions and is provided integrally with each of the fixed portions. The machine body,
A working device operably provided in the machine body;
A work machine comprising: the cab according to claim 1 or 2 mounted on a machine main body adjacent to the work device.

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