JP2009035198A - Cab structure for construction machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cab structure for a construction machine which suppresses the deformation of a cab when the construction machine topples over. <P>SOLUTION: The mounting position of a roof panel 13 is made to be higher by folding respective flanges 12 of roof rails 6, 7 in a diagonally upward direction, so that the cross section of a roof reinforcement 17 arranged between the roof panel 13 and a roof pad 25 is made to be larger. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a construction machine cab structure for a construction machine such as a power shovel.

  As shown in FIGS. 6, 7, and 8, there is a construction machine cab 30 in which left and right front pillars 31 and 32 and roof rails 33 and 34 are integrally formed of deformed steel pipes.

  The deformed steel pipe is formed by drawing a steel pipe into an irregular cross-section, and has a flange 35 extending laterally. The flange 35 functions as a weather strip mounting flange that seals the closed front window 36 at the position of the front pillars 31 and 32, and functions as a mounting flange for mounting the roof panel 37 at the positions of the roof rails 33 and 34. .

  Further, between the roof rails 33 and 34 below the roof panel 37, one or a plurality of roof reinforcements 38 for receiving a lateral force acting on the roof rails 33 and 34 are provided. A roof pad 39 forming a ceiling is provided between the roof rails 33, 34 below the force 38.

JP 2001-207479 A

  By the way, in the case of the construction machine cab structure which comprises the front pillars 31 and 32 and the roof rails 33 and 34 using a deformed steel pipe, the front pillars 31 and 32 and the roof rails 33 and 34 have the same cross section, and the shape of the flange 35 is the front window 36. Therefore, there is a problem that the roof reinforcement 38 that receives a lateral load when the cab falls is difficult to lay out.

  For this reason, when the construction machine cab 30 falls, the roof reinforcement 38 may not function sufficiently. In this case, the lateral load 41 acting on the roof 40 is supported only by the front and rear headers 42, 43, and the front header 42 having a smaller cross section than the rear header 43 may buckle, and the construction machine cab 30 may be significantly deformed.

  Then, the objective of this invention is providing the construction machine cab structure which can suppress the deformation | transformation of a construction machine cab even if the construction machine falls over and solves the said subject.

  In order to solve the above-described problems, the present invention forms each front pillar with a deformed steel pipe having a flange for attaching a front window weather strip to attach a front window weather strip between a pair of left and right front pillars. The deformed steel pipes are respectively extended rearward from the upper ends of the front pillars to form roof rails, roof panels are provided between the flanges of the roof rails, and roof reinforcements extending in the left-right direction are provided between the roof rails below the roof panels. In a construction machine cab provided with a plurality of bridges, and a roof pad provided between the roof rails below the roof reinforcement to form a ceiling, the roof rail flanges are bent obliquely upward to remove the roof panel. Increasing the only position, it is to increase the cross-sectional area of the roof reinforcement that is disposed between the roof panel and the roof Pat.

  The roof reinforcement includes a main body portion having a U-shaped cross section and a mounting portion that is formed to extend outward in the horizontal direction from each upper end of the main body portion and is welded to the roof panel. By doing so, it is good to have a closed cross section.

  The front part of the roof rail is preferably formed in the same cross section as the front pillar, and a roof window is formed on the roof panel between the front parts of the roof rail.

  A sunshade for covering the roof window may be slidably provided on the lower surface of the roof reinforcement via a sunshade rail.

  The sunshade rail may have a guide groove for slidably inserting a side end of the sunshade, and the roof pad may be attached to the lower surface of the sunshade rail.

  According to the present invention, the strength of the roof can be increased, and deformation of the cab can be suppressed even when the construction machine falls.

  Preferred embodiments of the present invention will be described with reference to the accompanying drawings. 1 shows the upper part of the construction equipment cab, FIG. 2 shows a cross section taken along line AA in FIG. 1, FIG. 3 shows a cross section taken along line BB in FIG. 1, and FIG. It shows the details.

  As shown in FIG. 1, the construction machine cab 1 forms an operator room of a construction machine such as a power shovel, and is formed in a box shape. The construction machine cab 1 has a frame structure in which glass or a steel plate is attached to the framework 2.

  The frame 2 of the construction machine cab 1 includes a pedestal frame (not shown) formed in a rectangular frame shape extending in the front-rear and left-right directions, and a pair of front pillars 4 provided upright on the left and right of the front portion of the pedestal frame, 5, roof rails 6, 7 formed extending rearward from the upper ends of the front pillars 4, 5, and standing upright on the left and right of the rear part of the pedestal frame, with the upper ends connected to the rear ends of the roof rails 6, 7. A pair of left and right rear pillars 8, a front header 9 provided between the upper ends of the pair of front pillars 4 and 5, and a rear header 10 provided between the upper ends of the pair of rear pillars 8. Configured.

  As shown in FIGS. 1 and 2, the pair of left and right front pillars 4, 5 are each formed of a deformed steel pipe having a flange 12 for attaching a weather strip 28 for the front window 11. The flange 12 is formed by drawing one side of a deformed steel pipe into a plate shape, and is formed along the axial direction while extending outward in the radial direction of the deformed steel pipe. The right front pillar 5 and the left front pillar 4 are formed symmetrically so that the front ends of the flanges 12 face each other, and a weather strip 28 for the front window 11 is attached to each flange 12. ing.

  The roof rails 6, 7 are formed by extending the respective shaped steel pipes constituting the front pillars 4, 5 rearward from the upper ends of the front pillars 4, 5, and are formed integrally with the front pillars 4, 5. The front portions of the left and right roof rails 6 and 7 are formed in the same cross section as the front pillars 4 and 5, respectively. Is formed. As shown in FIGS. 3 and 4, the rear flanges 12 of the roof rails 6 and 7 are formed to be bent so that the front ends are inclined upward. A roof panel 13 that constitutes the roof of the construction machine cab 1 is provided between the flanges 12 of the roof rails 6 and 7. The roof panel 13 is made of a steel plate formed into a predetermined shape by press working, and the left and right sides are welded to the flange 12 respectively. The roof panel 13 is formed to bend so that the rear portion is raised, and the left and right sides of the roof panel 13 are overlapped with the end of the flange 12. A sealer 15 that covers the welded portion 14 in a watertight manner is provided on the upper surface of the welded portion 14 between the flange 12 and the roof panel 13.

  As shown in FIGS. 1 and 3, a roof window 16 is formed at the front portion of the roof panel 13, and a roof reinforcement that extends in the left-right direction between the roof rails 6 and 7 below the rear portion of the roof panel 13. One or a plurality of ment 17 are provided. As shown in FIG. 5, the roof reinforcement 17 is formed by extending a body portion 18 having a U-shaped cross section and extending outward from each upper end of the body portion 18 in the horizontal direction, and is welded to the roof panel 13. Mounting portion 19. The main body 18 is in contact with the roof rails 6 and 7 at both ends in the left-right direction, and receives a lateral load (external force in the left-right direction) 27 that acts on the roof rails 6 and 7 when it falls. The attachment portion 19 is welded to the lower surface of the roof panel 13 so that the roof reinforcement 17 has a closed cross section integrated with the roof panel 13, and the strength of the roof reinforcement 17 against the lateral load 27 is improved. Yes.

  As shown in FIG. 4, the roof reinforcement 17 is inclined so that both left and right ends are aligned with the inclination of the flange 12, and the cross-sectional area of the central portion 20 is the cross-sectional area of both end portions 21, that is, the conventional roof rain. It is formed larger than the cross-sectional area of the force. Moreover, the height of the both ends 21 of the roof reinforcement 17 is formed at substantially the same height as that of the conventional roof reinforcement, so that the living space in the construction machine cab 1 is not lowered.

  A sun shade 22 for covering the roof window 16 is slidably provided on the lower surface of the roof reinforcement 17 via a sun shade rail 23. The sunshade 22 is made of a plate material having a size slightly larger than that of the roof window 16. The sunshade rail 23 supports both sides of the sunshade 22 so as to be slidable in the front-rear direction. The sunshade rails 23 are formed so as to extend in the front-rear direction, and have guide grooves 24 into which the side ends of the sunshade 22 are slidably inserted.

  A roof pad 25 that constitutes the ceiling of the operator room is attached to the lower surface of each sunshade rail 23.

  Next, the operation of this embodiment will be described.

  When a construction machine (not shown) having the construction machine cab 1 falls and a lateral load 27 acts on the roof rails 6 and 7 of the construction machine cab 1, this external force is transmitted to the front header 9 and the rear header 10, and roof rain It is transmitted to the Force 17. At this time, the roof reinforcement 17 is formed in a closed section larger than the conventional one and has a high strength. Therefore, the roof reinforcement 17 can receive an external force with almost no deformation, and a force acting on the front header 9 and the rear header 10. And the deformation of the front header 9 and the rear header 10 can be suppressed.

  Further, since the roof panel 13 is increased in height to increase the cross-sectional area of the roof reinforcement 17, it is possible to prevent the ceiling position of the construction machine cab 1 (the position of the roof pad 25) from being lowered. It is possible to prevent the habitability from being impaired.

  In this way, the flanges 12 of the roof rails 6 and 7 are bent obliquely upward to raise the mounting position of the roof panel 13, and the roof reinforcement 17 disposed between the roof panel 13 and the roof pad 25 is cut off. Since the area is increased, the installation space for the roof reinforcement 17 can be easily increased with a simple additional work by bending the flange 12 of the deformed steel pipe constituting the roof rails 6 and 7, and the cab falls. The roof reinforcement 17 that receives the lateral load 27 can be easily laid out. And the intensity | strength of the roof 26 with respect to the lateral load 27 can be raised easily, and the safety | security of the construction machine cab 1 can be improved.

  The roof reinforcement 17 includes a main body portion 18 having a U-shaped cross section, and a mounting portion 19 formed to extend outward in the horizontal direction from each upper end of the main body portion 18 and welded to the roof panel 13. Since the structure has a closed cross-section by being welded to the roof panel 13, the roof panel 13 can be used as a part of the strength material, and the strength of the roof 26 can be increased efficiently.

  The front portions of the roof rails 6 and 7 are respectively formed in the same cross section as the front pillars 4 and 5, and the roof window 16 is formed in the roof panel 13 between the front portions of the roof rails 6 and 7. A wide field of view can be ensured while the lateral load 27 can be received.

  Since the sun shade 22 for covering the roof window 16 is slidably provided on the lower surface of the roof reinforcement 17 via the sun shade rail 23, the roof window 16 can be opened and closed with a simple structure.

  Since the sunshade rail 23 has the guide groove 24 into which the side end of the sunshade 22 is slidably inserted and the roof pad 25 is attached to the lower surface of the sunshade rail 23, the sunshade 22 and the ceiling can be simplified.

  In addition, although the roof reinforcement 17 shall be provided in the rear part of the roof 26, it is not restricted to this. When the roof window 16 is not provided at the front portion of the roof 26, it may be provided on the entire roof 26.

It is a top perspective view of a construction machine cab showing a preferred embodiment of the present invention. It is AA arrow sectional drawing of FIG. It is a BB arrow directional cross-sectional view of FIG. It is a principal part enlarged view of FIG. It is CC sectional view taken on the line of FIG. It is a top perspective view of the conventional construction machine cab. It is DD sectional view taken on the line in FIG. FIG. 7 is a cross-sectional view taken along line EE in FIG. 6.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Construction machinery cab 4 Front pillar 5 Front pillar 6 Roof rail 7 Roof rail 11 Front window 12 Flange 13 Roof panel 16 Roof window 17 Roof reinforcement 18 Main part 19 Mounting part 22 Sun shade 23 Sun shade rail 24 Guide groove 25 Roof pad 28 Front window Weather strip

Claims (5)

  Each front pillar is formed by a deformed steel pipe having a flange for attaching the front window weather strip to attach the front window weather strip between the pair of left and right front pillars, and each of the deformed steel pipes is formed from the upper end of the front pillar. A roof rail is formed by extending rearward, a roof panel is provided between the flanges of the roof rail, and a plurality of roof reinforcements extending in the left-right direction are provided between the roof rails below the roof panel. In the construction machine cab structure in which a roof pad is provided between the lower roof rails to form a ceiling, the roof rail flanges are bent obliquely upward to raise the mounting position of the roof panel. Construction equipment cab structure, characterized in that to increase the cross-sectional area of the roof reinforcement that is disposed between the roof Pat.   The roof reinforcement includes a main body portion having a U-shaped cross section and a mounting portion that is formed to extend outward in the horizontal direction from each upper end of the main body portion and is welded to the roof panel. The construction machine cab structure according to claim 1, wherein the construction machine has a closed cross section.   The construction machine cab structure according to claim 1 or 2, wherein a front portion of the roof rail is formed in the same cross section as the front pillar, and a roof window is formed in a roof panel between the front portions of the roof rail.   The construction machine cab structure according to claim 3, wherein a sunshade for covering the roof window is slidably provided on a lower surface of the roof reinforcement via a sunshade rail.   The construction machine cab structure according to claim 4, wherein the sunshade rail has a guide groove for slidably inserting a side end of the sunshade, and the roof pad is attached to a lower surface of the sunshade rail.

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