JP4484546B2 - Work machine cab structure - Google Patents

Description

  The present invention relates to a driver's cab in a work vehicle such as a construction machine such as a hydraulic excavator, an agricultural machine such as a tractor, and other industrial machines, and more particularly has a structure capable of enhancing the rigidity of the frame structure and improving the productivity. The present invention relates to a cab structure of a work machine.

  There are various types of work vehicles such as construction machines, agricultural machines, and other cargo handling machines. For example, hydraulic excavators in construction machines are widely used for civil engineering work, building foundation work, and building demolition. ing. In these operations, the operator operates the work implement while visually checking the front through the front window from the driver's cab. In this way, the cab of a work vehicle that works while visually checking the front from the cab can not be structured to have a wide space due to the structure of the vehicle on which the work implement is mounted, but has a wide field of view during work. Therefore, there is a demand for visibility that can be secured.

  Further, in a work vehicle such as a hydraulic excavator, the rigidity of the operator's cab, in particular, the skeleton constituent member is improved from the viewpoint of protection of the operator, and the pipe material having an irregular cross section is rationally used to improve the functionality. Such a technique is known from Patent Document 1 or Patent Document 2, for example. In the technique disclosed by Patent Document 1, a slide rail for opening and closing the front glass window of the cab is formed by recessing the opposing side surface portion of the front support column, and the other part is folded so as to overlap. It is disclosed that a skeleton member to which functionality is added by forming a pipe material is used, and that the skeleton member in other portions is also formed from a pipe material that is similarly formed.

  Moreover, in what is known by the said patent document 2, the thing which uses the steel pipe of an irregular cross section for the rear part support | pillar of a cab, and bends the intermediate part so that the lower part may match the shape of a cab is used. Is disclosed.

JP 2000-198468 A Japanese Patent Laid-Open No. 2002-161552

  In the above-described prior art, the skeleton member of the cab according to the above-mentioned Patent Document 1 includes a groove portion that forms a guide rail of a front window and a rib for reinforcement by forming a pipe material as left and right front columns and roof side frames. It is effective in improving functionality, but when adding additional parts, it is often attached by welding, and this skeleton member is formed by forming pipe material Since it is made into the required shape, there is a problem that the strength is lowered by locally adding heat by welding to the one that has been hardened and increased in strength at the time of molding. Therefore, if the strength of these pillars and frames is increased, the cross section becomes large, which impairs the improvement of visibility.

  On the other hand, in the rear pillar (rear strut) of the operator's cab disclosed by the above-mentioned Patent Document 2, as with the front pillar, a bent pipe material is used to form the pipe. When an additional part is attached by welding when constructing the skeleton of the operator's cab, the strength that has been increased by work hardening of the pipe material due to heating applied locally as described above partially reduces the strength. In the unlikely event of a fall, there is a risk of damage due to failure to retain shape. Further, since these members are formed by forming a pipe from a pipe material into a deformed cross section, there is a problem that the forming is limited by the production limit of the deformed pipe and the shape limitation coming from the uniform meat pipe and is difficult to reinforce. Further, if the rear pillar is bent using a uniform-thick pipe material, it is not preferable because the structure is weak against torsional load when a falling load acts.

  The present invention has been made to solve such problems, and has a high workability and a simple structure without using a pipe material having a cross-sectional structure by secondary processing as a skeleton member. An object of the present invention is to provide a cab structure for a work machine that can be enhanced.

In order to achieve the above object, the cab structure of the work machine according to the present invention includes:
As the frame material constituting the operator's cab, the front pillar and the roof side frame in the front-rear direction are formed of unequal thick rolled steel materials having uneven portions that serve as receiving groove portions and window frame forming portions of sliding members on the outer surface, The outer surface of the cab after the assembly of the unequal thickness rolled steel material forming the front pillar and the roof side frame is an arc curved surface, and the thickness of the arc curved surface is the arc at the front of the cab. It has the thinnest part in the curved surface and is formed so as to gradually increase from the part to the side surface (first invention).

  The front pillar and the roof side frame are preferably integrally formed by bending (second invention).

  The front pillar and the roof side frame may be configured to be welded together by a joint member (third invention).

In the present invention, a hollow box shape re Apira preferably comprises a reinforcing rib inside the bent portion (the fourth invention).

Further, in the first to fourth inventions, the unequal thick rolled steel material having the recesses and projections on the outer surface serving as receiving groove portions and window frame forming portions of the sliding member preferably has a hollow structure ( fifth invention). ).

Further, in the first to fourth inventions, the unequal thick rolled steel material having the concave and convex portions serving as the receiving groove portion and the window frame forming portion of the sliding member on the outer surface is an inner portion in which one of the major axes of the cross section is opened. It may be of a cross sectional structure formed a space (the sixth invention).

  According to the first invention, as a front pillar in the cab, the guide rail portion of the front window (the receiving groove portion of the sliding member) and the attachment portion of the side window glass (window frame forming portion) are not formed in a cross-sectional shape. By using an equal-thick rolled steel material, it is possible to most efficiently ensure the strength at the time of falling with a dimension within a restricted range that does not impair the forward visibility. And since rolled steel materials can be used, the components of the material are adjusted at the time of rolling. Therefore, even if post-processing such as welding is performed, the strength is not lowered and the processing is easy, and the workability is impaired. There is an effect that there is nothing.

  By adopting the configuration of the second invention, a curved surface portion corresponding to the outer shape of the operator cab can be formed by bending, and the strength of the member is reduced even if bending is performed by applying heat. There is an effect that it is possible to secure a high strength and finish it with a beautiful appearance. In addition, the number of parts and the number of processing steps can be reduced, and the cost can be reduced.

  In addition, by adopting the configuration of the third aspect of the invention, even if a joint formed at the bent portion is used, the strength is not lowered by welding, and the workability is facilitated and the strength at the time of falling can be secured. There are advantages. Moreover, when using a joint member, it can join firmly by fitting the connection edge part of a joint member to the hollow part of a pillar member (rolled steel material).

According to the fourth aspect of the present invention, the frame constituting the cab has a roof side frame, a torsional strength, and a front pillar made of unequal thick rolled steel that has a high strength at the time of falling and can maintain a good front visibility as described above. As a work vehicle, it is possible to ensure the protection of the inside of the cab when traveling and working. Further, there is an advantage that the workability at the time of manufacture can be facilitated and the cost can be reduced.

Further, according to the fifth invention, it is formed in accordance with the function of the location where the outer shape is used as the pillar member or the roof side frame, and increases the cross-sectional strength, so that it can be used as it is without particularly installing the parts on the outer surface. This can be achieved, and if a part that does not require a protruding portion is scraped off, the object can be achieved, and there is an advantage that processing can be performed arbitrarily. In addition, the use of unequal thick rolled steel for the skeletal member means that it is rolled using a material whose components have been adjusted in advance, even when a joint is used or when bending is performed by applying heat. There is no problem with performance. Moreover, the inside can be made hollow to reduce the weight, and a member having high cross-sectional strength can be obtained.

According to the sixth aspect of the invention, unlike the member of the fifth aspect of the present invention, the cross-sectional shape has a space part inside which is partially opened, but the same effect as the unequal thick rolled steel material having the hollow cross section can be obtained.

  Next, a specific embodiment of the cab structure of the working machine of the present invention will be described with reference to the drawings.

  FIG. 1 is a perspective view showing a skeleton of a cab mounted on the work vehicle of the present embodiment. FIG. 2 is a perspective view (a) of a member obtained by integrally bending a roof pillar from a front pillar and a sectional view (b) taken along the line AA of FIG. 3, and FIG. FIG. 4 shows a perspective view (a) representing one rear pillar and an exploded view (b) thereof.

  The cab structure of the present embodiment will be described for a hydraulic excavator in a construction machine.

  The driver's cab 1 of this embodiment includes a front pillar (front column) 2 and a roof side frame (longitudinal members arranged in the front-rear direction of the driver's cab) 3 as the main skeleton constituting the same. It is made of thick rolled steel, and the rear pillar (rear strut) 10 is made of a flat hollow box-shaped member. Well-known plate materials and shaped steel are used for the members that connect these to the left and right, and the members of the surface structure. Is configured.

  The material for forming the front pillar 2 and the roof side frame 3 is a hollow non-uniformly thick rolled steel material 20 having a cross-sectional structure as shown in FIG. 2 (b). In this case, the outer edge of the roof portion is curved from the front side edge of the cab 1 as it is, and the design effect is exhibited. In addition, two shallow grooves 22 and 23 are formed on the side surface facing inward during use, and a high protrusion 24 is provided adjacent to one of the grooves 23. The groove portions 22 and 23 are formed so as to be slightly wider, and the groove 23 adjacent to the protrusion 24 is formed as a guide rail (see FIG. 3) for sliding the front window 30 (receiving the sliding member of the present invention). The inner surface 24 ′ of the ridge 24 becomes the seal receiving surface of the front window 30. Further, an oblong hollow hole 25 is formed inside to reduce the weight. Furthermore, a flat step portion 26 is formed through an inclined surface 26 ′ connected to the circular arc surface 21, and a mounting surface (see FIG. 3) of the side window glass 31 using the step portion 26 (see the present invention). Equivalent to the window frame forming portion). Further, the corner portion 27 at the end of the step portion 26 is chamfered. The unequal thick rolled steel material 20 having such a cross-sectional shape is a steel material whose components are adjusted at the time of the steel making and has less thermal influence. Reference numerals 22 'and 23' in the figure are protrusions forming grooves.

  The cab 1 constructed using such a steel material is formed by bending the main part of the cab 1 from the front pillar 2 to the roof side frame 3 with one of the above-mentioned members. It is arranged symmetrically so as to be an edge. In this state, the base member 4 is welded to the lower end portions of the left and right members 2 and 2, and connected to each other at a predetermined interval by the lateral connecting members 5 and 5 'to constitute a frame. It should be noted that a roller (not shown) is removed from the guide rail so that the front window can be opened as a guide rail of the front window as a guide rail for the front window. The parts to be removed and the places where the horizontal connecting members 5 and 5 'are attached are scraped off before use.

  When bending the member (steel material 20), for example, it is heated to a high frequency and bent into a required shape. When welding the longitudinal connecting members 6, 6 ', etc., for example, as shown in FIG. 3, since the inclined surface 27 is formed in advance to be a chamfered portion, it is surely possible without post-processing. Can be welded.

  Next, as illustrated in FIGS. 4 (a) and 4 (b), the rear pillar 10 is constituted by a member having a hollow box cross section, so that an installation space for equipment mounted on the vehicle side can be secured. In the case where the rear lower side of 1 is formed in a contracted shape, when the pillar 10 is bent, the cross-section strength is increased by integrally welding the bent end surface portion 11 with the flat pieces as reinforcing ribs 12 and 12a. Has been. The rear pillar 10 is a flat box that is bent by combining pieces 13, 14, 15, 16 formed in a shape necessary to form a rear pillar with a required cross section such as an L shape or a U shape. Are formed in the vertical direction. By adopting such a structure, a planar member is interposed as the reinforcing ribs 12 and 12a for each bent portion, and can be formed firmly against torsional external force by being configured just like a node in bamboo. .

  Further, in the rear pillar 10 having the above-described structure, a member that is connected horizontally by providing an extended portion 17 and a protruding portion 12 ′ of the reinforcing rib 12 in a required shape from a portion in which a part of the constituent member is formed in a box shape. It can be used as a part of or a mounting seat, and the structure can be simplified and finished with high strength.

  In the configuration of the cab 1, as illustrated in FIG. 1, the cab 1 is mounted on a vehicle body (not shown) and the outside without any trouble is used as the upright pillar 10 '. However, the strength can be increased by forming the pillar 10 ′ in a hollow box shape and providing a reinforcing rib (not shown) that crosses the cross section inside if necessary.

  Next, FIG. 5 is a side view (a) of a main part showing an aspect in the case where a joint is used for a bent part connecting the front pillar and the roof side frame, and a sectional view (b) taken along the line BB in the part. It is shown.

  In this embodiment, the hollow unequal thick rolled steel material 20 is used, the front pillar 2 and the roof side frame 3 are separated, and the two are connected by interposing a joint 35 at a portion that becomes a bent portion as a frame. It is what you do. As the joint 35 in this case, the outer shape of the joint 35 is the same as the outer shape of the hollow unequal thickness rolled steel material 20, and the side surface corresponding to the attachment portion of the laterally connecting member 5 '(in this case, the protrusions). 24) is formed flat, and the connecting portion 36 is formed so that both ends of the joint 35 can be inserted into the hollow hole 25 of the hollow unequal thick rolled steel material 20. The connecting portions 36, 36 are inserted into the hollow holes 25 of the member (20) to be the front pillar 2 and the roof side frame 3, and welded at the notch 36 'provided in the joining surface portion. Connect to.

  If such a joint 35 is used, the front pillar 2 and the roof side frame 3 can be connected without performing the bending process as described above, and can be finished beautifully without performing local bending. it can. In addition, in this portion, the horizontal connecting member 5 ′ may be welded to the side portion of the joint 35 without cutting the hollow unequal thick rolled steel material 20 that forms the front pillar 2 and the roof side frame 3. Workability can be improved.

  Further, FIG. 6 shows a perspective view (a) representing an embodiment of a driver's cab using a material having another cross-sectional structure and a diagram (b) representing a cross-section CC thereof. In addition, this unequal thick rolled steel material 20 'is basically the same as the embodiment described above, and has a part of the structure different from that of the embodiment described above. The same reference numerals as those in the above embodiment are given, and the description is omitted.

  In this embodiment, the front pillar 2 ′ and the roof side frame 3 ′ are similar in shape to the hollow unequal thick rolled steel material 20, and the hollow hole 28 is opened on the opposite side to the arc curved surface 21 part. The cab 1 is formed of a rolled steel material 20 ′ having a cross-sectional shape and is configured in the same embodiment as that shown in FIG. 1. The rolled steel material 20 'having such a cross-sectional shape is also bent in the same manner as in the above embodiment to form the front pillar 2' and the roof side frame 3 'in a series of bent structures, and functions in the same manner as described above. Can be made. The rolled steel material 20 'is inferior in strength to the rolled steel material 20 because the hollow hole 28 portion is open, but a sound absorbing material (not shown) can be easily provided in the hollow hole 28 portion, and is operated from the outside. Noise entering the interior of the chamber 1 can be reduced.

  Although the above-described cab structure has been described as being mounted on a hydraulic excavator, the cab structure can also be employed in cabs in other working machines in accordance with the spirit of the present invention.

The perspective view showing the framework of the cab mounted in the work vehicle of this embodiment Perspective view (a) and AA cross-sectional view (b) of a member obtained by bending the roof pillar integrally from the front pillar The figure showing the section of the principal part at the time of use A perspective view showing one rear pillar and an exploded view thereof (b) Side view (a) of the main part showing an aspect in the case where a joint is used at a bent part connecting the front pillar and the roof side frame, and a cross-sectional view taken along the line B-B in the part (b). The perspective view (a) showing the embodiment of the cab using the material of other section structures, and the figure showing the section CC

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Driver's cab 2, 2 'Front pillar 3, 3' Roof side frame 5, 5 'Horizontal connecting member 6, 6' Vertical connecting member 10, 10 'Rear pillar 11 Bending end surface 12, 12' Reinforcement rib 20, 20 'Hollow Unequal thickness rolled steel 21 Arc curved surface 22, 23 Groove 24 Projection 25 Hollow hole 30 Front window 35 Joint 36 Connection part

Claims (6)

As the frame material constituting the operator's cab, the front pillar and the roof side frame in the front-rear direction are formed of unequal thick rolled steel materials having uneven portions that serve as receiving groove portions and window frame forming portions of sliding members on the outer surface, The outer surface of the cab after the assembly of the unequal thickness rolled steel material forming the front pillar and the roof side frame is an arc curved surface, and the thickness of the arc curved surface is the arc at the front of the cab. A cab structure for a working machine having a thinnest portion in a curved surface and formed so as to gradually increase from the portion to a side surface.   The cab structure of the working machine according to claim 1, wherein the front pillar and the roof side frame are integrally formed by bending.   The cab structure of the working machine according to claim 1, wherein the front pillar and the roof side frame are welded and joined by a joint member.   The cab structure of the working machine according to claim 1, wherein the rear pillar has a hollow box shape and includes a reinforcing rib inside the bent portion.   The cab structure of the working machine according to any one of claims 1 to 4, wherein the unequal thick rolled steel material having a concave and convex portion serving as a receiving groove portion and a window frame forming portion of the sliding member on the outer surface has a hollow structure. .   The unequal thick rolled steel material having the concave and convex portions that become the receiving groove portion of the sliding member and the window frame forming portion on the outer surface has a cross-sectional structure in which a space is formed inside one of the long axes of the cross section. The cab structure of the working machine according to any one of claims 1 to 4.

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