JP2004076383A - Service car - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a service car, capable of conducting an operation feeling easy without narrowing the visual field of an observation, in which a space for ensuring a protective device may be reduced and which can relax an impulse from the outside to a driver's cab. <P>SOLUTION: The service car has a revolving superstructure 2, with the driver's cab arranged on a frame 3. A floor frame 14 for the driver's cab 4 is supported to the frame 3 through a damper 31. A protective member 40 for relaxing the impulse from the outside to the driver's cab 4 is disposed upright from the frame 3 apart from the driver's cab 4 at a place as a dead angle section by a rear observation by an operator in the driver's cab 4. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a work vehicle (for example, a construction machine such as a hydraulic shovel), and more particularly to a work vehicle provided with a protection device for mitigating an external impact on a driver's cab.
[0002]
[Prior art]
2. Description of the Related Art In recent years, construction machines such as hydraulic shovels have often been used in narrow and obstructed sites. That is, there is a case where there is an obstacle such as a beam below the ceiling of the driver's cab, and in such a place, there is a possibility that the driver's cab will collide with this obstacle during the work. For this reason, conventionally, a work vehicle in which a protection device is arranged near a cab has been developed. A work vehicle equipped with this protection device is described in Japanese Patent Application Laid-Open No. 8-151665.
[0003]
That is, as shown in FIGS. 9 and 10, the protection device includes a pair of columns 83 and 84 erected from the frame 82 of the upper swing body 81, and a protection member 85 connecting the upper ends of the columns 83 and 84. It is provided with. The protection member 85 is made of a strip material and is separated from the rear surface of the cab 86 by a predetermined dimension. That is, the protection member 85 is composed of a main body portion 85a surrounding the upper portion on the rear side of the cab 86 and hanging portions 85b and 85b hanging from the main body portion 85a. It is located at substantially the same height as the upper edge of the rear window 87 of the cab 86. Further, a transparent protective plate 88 is attached to the columns 83 and 84 below the protective member 85, corresponding to the rear window 87 of the cab 86.
[0004]
[Problems to be solved by the invention]
Therefore, in the conventional protection device as shown in FIGS. 9 and 10, when the operator in the operator's cab 86 observes the rear through the rear window 87, the field of view (field of view) may be narrowed by the protection member 85 or the like. . That is, the upper limit of the field of view for observation by the rear window 87 when the protective device is not mounted is along the upper edge of the rear window 87 and is S in FIG. On the other hand, if the protective device is mounted, the upper limit of the field of view for observation is S1 due to the protective device, and the field of view becomes narrow. Further, supporting columns 83 and 84 are erected near the operator's cab, and a protective member 85 and the like are mounted on the columns 83 and 84. A protective device as a separate member is added to the upper swing body 81. As a result, the appearance is not very favorable and the design is inferior. Further, it is necessary to secure a space for the protection device behind the operator's cab 86, and it has been difficult to achieve the overall compactness and simplification.
[0005]
SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned conventional disadvantages, and has as its object to be able to carry out work with a sense of security without narrowing the field of view for observation, and to secure a protective device. An object of the present invention is to provide a work vehicle that requires a small space and that can reduce an external impact on a driver's cab.
[0006]
Means and effects for solving the problem
Therefore, a work vehicle according to claim 1 is a work vehicle provided with an upper revolving structure having a driver's cab arranged on a frame, wherein a floor frame of the driver's cab is supported on the frame via a vibration damping device, In addition, a protection member for reducing impact from the outside to the operator's cab is provided independently from the operator's cab at a position that becomes a blind spot in a rearward observation by an operator in the operator's cab, and is erected from the frame. Features.
[0007]
According to the work vehicle of the first aspect, the floor frame of the cab is supported by the frame via the vibration damping device, so that the operator of the cab has a comfortable ride. In addition, since the protection member is provided at a position serving as a blind spot in the rearward observation by the operator in the driver's cab, the field of view (field of view) of the rearward observation is not narrowed, and the rear safety confirmation can be stably performed. In addition, the protection member can mitigate an external impact on the rear side of the operator's cab, and prevent the driver's cab from being deformed or damaged due to the external impact. Further, since the protection member is erected from the frame of the upper swing body independently of the cab, sufficient rigidity can be obtained as a mounting structure. For this reason, the protective member can exhibit an excellent function as the protective member.
[0008]
The work vehicle according to claim 2 is characterized in that the protection member and the cab are opposed to each other with a small gap, and the outer surface of the protection member and the outer surface of the cab are substantially continuous or curved.
[0009]
According to the work vehicle of the second aspect, the protection member and the driver's cab are opposed to each other with a small gap, and the outer surface of the protection member and the outer surface of the driver's cab are formed as a substantially continuous plane or curved surface. The member and the cab have a shape as if they were integrated. For this reason, the appearance is similar to that of a normal work vehicle having no protective member, and the design is excellent. Moreover, the space for securing the protection member can be small.
[0010]
According to a third aspect of the present invention, there is provided a work vehicle, wherein a recess opening outward is formed in a corner portion on a rear side of a cab, and the protection member is fitted into the recess.
[0011]
According to the work vehicle of the third aspect, since the protection member is fitted into the recessed portion of the corner portion on the rear side of the cab, the protection member at the corner portion on the rear side of the cab is provided. The amount of protrusion can be minimized. As a result, the overall size and size can be reduced, and the external shape can be more beautifully finished.
[0012]
In the work vehicle according to the fourth aspect, the protection member is disposed above a pair of vertical hollow frames disposed at a rear corner of the cab and an upper edge of a rear window portion of the cab. A first horizontal hollow frame, a second horizontal hollow frame disposed below a lower edge of a rear window of the cab, and a third horizontal frame mounted on the frame of the upper swing body. And a hollow frame.
[0013]
According to the work vehicle of the fourth aspect, the protection member has a pair of vertical hollow frames, a first horizontal hollow frame, a second horizontal hollow frame, and a third horizontal hollow frame. is there. Therefore, the overall strength of the protection member is excellent, and the protection function can be sufficiently exhibited.
[0014]
In the work vehicle according to claim 5, the protection member has a plate wall portion that forms a double wall structure with a rear panel of the cab between the second horizontal hollow frame and the third horizontal hollow frame. It is characterized by:
[0015]
The work vehicle according to claim 5 is provided with a plate wall portion forming a double wall structure with the rear panel of the cab between the second horizontal hollow frame and the third horizontal hollow. It has a soundproofing effect against noise from the engine room and the like arranged behind the room. For this reason, transmission of noise to the cab can be reduced, and workability of the operator in the cab can be improved.
[0016]
BEST MODE FOR CARRYING OUT THE INVENTION
Next, specific embodiments of the work vehicle according to the present invention will be described in detail with reference to the drawings. FIG. 3 shows a simplified diagram of a hydraulic shovel as a construction machine that is a working vehicle. The hydraulic excavator includes a lower traveling structure 1 and an upper revolving structure 2 disposed thereon, and the upper revolving structure 2 has a cab (cab) 4 provided on a frame 3 thereof. Further, the upper swing body 2 is provided with a working machine 8 having a boom 5, an arm 6, and a bucket 7, and the like. The boom 5 is swung by a boom cylinder 10, the arm 6 is swung by an arm cylinder 11, and the bucket 7 is swung by a bucket cylinder 12.
[0017]
As shown in FIGS. 1 and 2, the cab 4 includes a cab body 13 and a floor frame 14 that closes a lower opening of the cab body 13. The cab body 13 includes a door-side panel 17, an opposite door-side panel 18, a front panel 19, a rear panel 20 (see FIG. 4), and a ceiling panel 21, and the door-side panel 17 has an opening. That is, an entrance 22 is provided, and a door 23 (see FIG. 3) is attached to the entrance 22. Further, the door side panel 17, the non-door side panel 18, the front panel 19, and the rear panel 20 are provided with window openings 25, respectively. As shown in FIGS. 4 and 5, a glass plate 26 is mounted, and side windows 27, 27, a front window 28, and a rear window 29 are configured. In addition, the glass plate 26 is fitted into a support frame 30 (in this case, the illustration is omitted for simplicity in FIG. 4) whose outer peripheral portion is formed on the peripheral edge of the window opening 25. Then, it is attached to the window opening 25. As shown in FIG. 3, the door 23 is also provided with a window opening 25, and a glass plate 26 is attached to the window opening 25 to form a door window 24.
[0018]
As shown in FIG. 4, the rear panel 20 includes an upper portion 20a in which a window opening 25 is formed, a lower portion 20b recessed from the upper portion 20a to the inside of the cab 4, and a concave portion 50 described later. And an intermediate connecting portion 20c having Accordingly, the opposite door side panel 18 has a notch 15 on the rear panel 20 side, as shown in FIG.
[0019]
The operator's cab 4 is arranged on the frame 3 via a vibration damping device 31 shown in FIG. The vibration damping device 31 includes, for example, a silicone oil sealing portion 34 sealed in the casing 32, an elastic member 35 disposed above the silicone oil sealing portion 34, a support member 36 for supporting the elastic member 35, and the like. A plurality of dampers 33 can be provided. In this case, the dampers 33 are attached to the floor frame 14 by screwing a bolt member 37 inserted through the through hole of the floor frame 14 to the support member 36. Therefore, the floor frame 14 is attached to the frame 3 via the vibration damping device 31, so that vibration from the frame 3 to the floor frame 14 can be reduced. (See FIG. 8), the improvement in ride comfort can be achieved.
[0020]
By the way, a protection member 40 is arranged behind the cab 4. As shown in FIGS. 1, 2, 4, 5, and 6, the protection member 40 includes a pair of vertical hollow frames 41 and 42 disposed in a corner portion on the rear side of the cab 4, A first horizontal hollow frame 43 disposed above the upper edge of the rear window 29 of the cabin 4, and a second horizontal frame disposed below the lower edge of the rear window 29 of the cab 4. It has a horizontal hollow frame 44 and a third horizontal hollow frame 45 mounted on the frame 3 of the upper swing body 2. Each of the hollow frames 41, 42, 43, 44, 45 can be made of a steel material or the like excellent in strength.
[0021]
In this case, a concave portion 46 that opens outward is formed in a corner portion on the rear side of the cab 4, and the protective member 40 is fitted into the concave portion 46. That is, the concave portions 47, 48, and 49 are formed at the corners of the door-side panel 17 and the rear panel 20, the corners of the opposite door-side panel 18 and the rear panel 20, and the corners of the ceiling panel 21 and the rear panel 20, respectively. 4, and concave portions 50 and 51 are provided between the upper portion 20a and the lower portion 20b of the rear panel 20 and at the lower end of the lower portion 20b of the rear panel 20, respectively. Therefore, the concave portions 47, 48, 49, 50, 51 are continuously formed to form the above-mentioned concave portion 46 having a character shape of "day" when viewed from the rear side.
[0022]
Specifically, as shown in FIG. 5, one of the vertical hollow frames 41 (on the side of the door-side panel 17) is made of a pipe material having a substantially trapezoidal cross section, and fits into the concave recess 47 of the recess 46. The other (the side opposite to the door-side panel 18), the vertical hollow frame 42 is made of a pipe material having a substantially rectangular cross section, and fits into the concave portion 48 of the concave portion 46. The vertical hollow frame 42 on the side opposite to the door side panel 18 has an upper first vertical portion 42a and a lower second vertical portion 42 corresponding to the rear end shape of the rear panel 20, as shown in FIG. A portion 42b and an inclined portion 42c connecting the first and second vertical portions 42a and 42b, and the concave portion 48 corresponds to the vertical hollow frame 42 as shown in FIG. The upper vertical part 48a, the lower second vertical part 48b, and the inclined part 48c connecting the first and second vertical parts 48a and 48b.
[0023]
As shown in FIG. 4, the first, second, and third horizontal hollow frames 43, 44, and 45 are each made of a pipe material having a substantially rectangular cross section. The second horizontal hollow frame 44 is fitted into the concave portion 50 of the recess 46, and the third horizontal hollow frame 45 is fitted into the concave portion 51 of the recess 46. To fit.
[0024]
The vertical hollow frame 41 and the first horizontal hollow frame 43 are connected via a corner member 52, and the vertical hollow frame 42 and the first horizontal hollow frame 43 are connected via a corner member 53. I have. The second horizontal hollow frame 44 and the third horizontal hollow frame 45 are fixed to the vertical hollow frames 41 and 42, respectively. The corner members 52 and 53 can be made of, for example, a cast article, a forged article, or the like. The connection between the corner members 52, 53 and the frames 41, 42, 43 and the connection (fixation) between the frames 41, 42, 44, 45 can be performed by fixing means such as welding.
[0025]
Further, as shown in FIGS. 4 and 5 and the like, a plate wall forming a double wall structure with the rear panel 20 of the cab 4 between the second horizontal hollow frame 44 and the third horizontal hollow frame 45. A part 57 is provided. In this case, the plate wall portion 57 is made of, for example, an iron steel plate and has an inclined portion 57a and a vertical portion 57b corresponding to the rear panel 20, and is hung down from the lower surface of the second horizontal hollow frame 44, The lower edge is attached to the third horizontal hollow frame 45 by fixing means such as welding.
[0026]
In the protective member 40 configured as described above, the third horizontal hollow frame 45 is fixed to the frame 3 of the upper swing body 2 via a bolt member (not shown), and the protective member 40 is erected on the frame 3. Is done. At this time, the protection member 40 is fitted into the recess 46 of the cab 4 as described above, but with a small gap with respect to the cab 4 as shown in FIGS. The cab 4 is attached to the frame 3 independently of the cab 4. In addition, the outer surface of the protection member 40 and the outer surface of the cab 4 are formed as substantially continuous or curved surfaces. That is, as shown in FIG. 5, since the outer surface 17a of the door-side panel 17 is a convex curved surface, the outer surface 54 of the vertical hollow frame 41 is substantially the same as the radius of curvature of the outer surface 17a of the door-side panel 17. It has a curved surface. Also, since the outer surface 18a of the non-door side panel 18 and the outer surface (upper surface) 21a of the ceiling panel 21 are flat, the outer surface 55 of the other vertical hollow frame 42, the upper surface 56 of the first horizontal hollow frame 43, etc. Are flat.
[0027]
By the way, the field of view (field of view) of the rear observation by the rear window 29 is in a range H shown in FIG. The field of view (field of view) for side observation is H1, H2, H3. That is, the range D between the windows 24 is a so-called blind spot, and the operator O who normally sits in the driver's seat of the cab 4 cannot observe the range D. . For this reason, in the protection member 40 of this embodiment, the longitudinal frames 41 and 42 are arranged within the range D of the blind spot portion in the rearward observation to prevent the view from becoming narrow. The first horizontal frame 43 is disposed above the upper edge of the rear window 29, and the second horizontal frame 44 is disposed below the lower edge of the rear window 29. The blind spot (not shown) on the upper side of the rear window 29 and the blind spot (not shown) on the lower side of the rear window 29 do not narrow the field of view.
[0028]
According to the work vehicle, the floor frame 14 of the driver's cab 4 is supported in a floating state with respect to the frame 3 via the vibration damping device 31, so that the operator of the driver's cab 4 has a comfortable ride. Become. Further, since the protection member 40 is provided at a position in the driver's cab 4 which is a blind spot in the rear observation by the operator, the field of view (field of view) of the rear observation is not narrowed, and the rear safety confirmation is stably performed. Can be. In addition, the protection member 40 can reduce the external impact on the rear side of the operator's cab, and can prevent the driver's cab 4 from being deformed or damaged due to the external impact. Further, since the protection member 40 is erected from the frame 3 of the upper revolving unit 2 independently of the cab 4, it is not necessary to float the protection member 40 from the frame 3 via the vibration damping device 31, and the mounting thereof can be performed. Easy. In addition, since the protection member 40 is erected directly on the frame 3 of the upper swing body 2, sufficient rigidity can be obtained as a mounting structure. For this reason, the protection member 40 can exhibit an excellent function as a protection member. Further, by forming the different protection members 40, the strength as the protection members 40 can be adjusted, and various types of vehicles can be configured by combining the common driver's cab 4 and the protection members 40. Can be. Therefore, when manufacturing various types of vehicles, the driver's cab 4 can be shared, and the manufacturing cost can be reduced.
[0029]
Further, since the protection member 40 and the cab 4 are opposed to each other with a small gap, and the outer surface of the protection member 40 and the outer surface of the cab 4 are substantially continuous planes or curved surfaces, the protection member 40 and the cab 4 are formed. 4 has a shape as if integrated. For this reason, the appearance is similar to that of a normal work vehicle without the protection member 40, and the design is excellent. Moreover, the space for securing the protection member 40 can be reduced. Furthermore, since the protection member 40 is fitted into the recess 46 that opens at the corner on the rear side of the cab 4, the amount of protrusion of the protection member 40 at the corner on the rear side of the cab 4 is reduced. It can be reduced as much as possible. As a result, the overall size and size can be reduced, and the external shape can be more beautifully finished.
[0030]
The protection member 40 includes a pair of vertical hollow frames 41 and 42, a first horizontal hollow frame 43, a second horizontal hollow frame 44, and a third horizontal hollow frame 45. Therefore, the overall strength of the protection member 40 is excellent, and the protection function can be sufficiently exhibited. Further, a plate wall portion 57 that forms a double wall structure with the rear panel 20 of the cab 4 is provided between the second horizontal hollow frame 44 and the third horizontal hollow frame 45, so that the cab 4 has a soundproofing effect against noise from an engine room or the like arranged on the rear side of the vehicle. Therefore, transmission of noise to the cab 4 can be reduced, and the workability of the operator O in the cab 4 can be improved.
[0031]
Although the specific embodiment of the work vehicle according to the present invention has been described above, the present invention is not limited to the above embodiment, and can be implemented with various modifications within the scope of the present invention. is there. For example, in the embodiment, the notch 15 is formed at the rear edge of the panel 18 on the side opposite to the door 18 of the driver's cab 4, and the lower part of the rear panel 20 is recessed inward of the driver's cab 4. Even if the retracted shape is not used, or if the retracted shape is used, a notch is formed at the rear edge of the door-side panel 17 of the operator cab 4 so that The frame 41 may have the same shape as the other vertical frame 42. In the embodiment, the outer surface of each frame 41 of the protection member 40 does not protrude from the outer surface of the driver's cab 4, but may protrude slightly so as not to impair the external design. May not have the recess 46 on the driver's cab 4 side. Further, the gap between the cab 4 and the protection member 40 is such that the cab 4 and the protection member 40 do not come into contact with each other due to vibration during running or various operations, and It can be set arbitrarily within a range that does not impair.
[Brief description of the drawings]
FIG. 1 is a perspective view of a main part showing an embodiment of a work vehicle according to the present invention.
FIG. 2 is a simplified perspective view of a cab of the work vehicle.
FIG. 3 is a simplified diagram of the work vehicle.
FIG. 4 is a sectional view taken along line AA of FIG. 1;
FIG. 5 is a sectional view taken along line BB of FIG. 1;
FIG. 6 is a sectional view taken along line CC of FIG. 1;
FIG. 7 is a cross-sectional view showing a vibration damping device for a driver's cab of the work vehicle.
FIG. 8 is an explanatory view of a field of view of an operator in a cab of the work vehicle.
FIG. 9 is a side view of a conventional work vehicle.
FIG. 10 is a rear view of a conventional work vehicle.
[Explanation of symbols]
2 Upper Revolving Structure 3 Frame 4 Operator's Cab 14 Floor Frame 20 Rear Panel 31 Damper 40 Protective Member 41 Vertical Hollow Frame 42 Vertical Hollow Frame 43 First Horizontal Hollow Frame 44 Second Horizontal Hollow Frame 45 Third Horizontal Direction hollow frame 46 recess 57 plate wall

Claims (5)

In a work vehicle provided with an upper revolving superstructure having a driver's cab arranged on a frame, a floor frame of the driver's cab is supported by the frame via a vibration damping device, and furthermore, a shock from outside to the driver's cab is applied. A work vehicle characterized in that a protection member for alleviating the above is erected from the frame independently of the driver's cab at a position serving as a blind spot in a rearward observation by an operator in the driver's cab. 2. The work vehicle according to claim 1, wherein the protection member and the cab are opposed to each other with a small gap, and the outer surface of the protection member and the outer surface of the cab are substantially continuous or curved. The work vehicle according to claim 1 or 2, wherein a concave portion that opens outward is formed in a corner portion on the rear side of the cab, and the protective member is fitted into the concave portion. The protection member includes a pair of vertical hollow frames disposed in a rear corner of the cab, and a first horizontal hollow frame disposed above an upper edge of a rear window of the cab. A second horizontal hollow frame disposed below a lower edge of a rear window portion of the cab, and a third horizontal hollow frame mounted on a frame of the upper swing body. The work vehicle according to any one of claims 1 to 3, wherein: The said protection member has a plate wall part which comprises a double wall structure with the rear panel of the said driver's cab between the 2nd horizontal hollow frame and the 3rd horizontal hollow. The work vehicle according to claim 4.

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