JP4197072B2 - Large vehicle for work - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to various tractor excavators, work vehicles for construction work such as burr tosa, etc., and particularly to large work vehicles. Specifically, the driving position of the vehicle driver can be maintained and the required rigidity is ensured. The present invention relates to a working vehicle having a protective column at the time of falling, having a simple mounting structure.
[0002]
[Prior art]
Due to the recent demands for reducing the price of social construction structures, each construction enterprise has to reduce construction costs even further. On the other hand, the construction work is drastically reviewed to thoroughly shorten the construction period.
[0003]
Specifically, the shortening of the work period is carried out by carrying out thorough man-hours and process management for each work site or by arranging appropriate personnel, and a considerable shortening of the work period is realized compared to the conventional method. .
[0004]
For this reason, in each construction enterprise, a large truck is adopted on the other hand because of the necessity to cope with the carrying-in / out ability of earth and sand, construction materials or construction waste materials in the shortened construction period. In order to load earth and sand, etc., larger work vehicles such as a tractor excavator and a bulltozer are often used.
[0005]
Since the work vehicle is large in size, it is usually not able to travel on public roads, and the vehicle body is usually divided into a front part and a rear part, or a cab having a driver's seat or a driver when the vehicle falls over. The protection pillars on the left and right sides of the cab provided for protection are manufactured separately from the vehicle body, and the equipment divided on the construction site is transported by truck and assembled at the construction site. Yes.
[0006]
FIG. 4 is a top view of a vehicle body frame having a typical structure of a large tractor excavator in the prior art, FIG. 5 is a side view around the driver's seat, and FIG. 6 is a rear view thereof. The vehicle body frame corresponds to this and is divided into the front vehicle body frame 1 and the rear vehicle body frame 2.
[0007]
The rear body frame 1 has a rear end portion and a front end portion of the rear body frame 2 having vehicle body connecting portions 3 and 4, and a coupling hole is formed at a substantially central portion of each of the vehicle body connecting portions 3 and 4. Is formed. The front and rear frames 1 and 2 are hinge-coupled by inserting the hinge pin 5 in a state where the centers of the coupling holes of the coupling members 3 and 4 are aligned.
[0008]
In the case of a large work vehicle, the cab 6 inevitably expands in the width direction and in the front-rear direction, and the blind spot area resulting from the positional relationship between the vehicle body and the driver increases. If the cab is simply installed on the upper surface of the vehicle, the field of view necessary for the driver is extremely limited. Therefore, conventionally, four support pillars 7a to 7d for front and rear and right and left for the cab are erected on the upper surface of the body frame 2, and the cab 6 is attached to the mounting seats 8a to 8d provided on the upper surfaces of the support pillars 7a to 7d. The mounting position of the cab 6, in other words, the height of the driver's seat is increased by the height of the support pillars 7 a to 7 d, and the driver's view is ensured. The cab 6 is attached by attaching the substantially central portion of the attachment portions 9a to 9d protruding downward from the floor surface of the cab 6 and the substantially central portion of the attachment seats 8a to 8d by appropriate fixing means such as bolts or welding. Fixed.
[0009]
At this time, the protective pillars 10a and 10b on the left and right side portions of the cab 6 may be provided in a range necessary and sufficient for protecting the driver, that is, protecting the cab 6 when the vehicle falls. As with the cab 6, the protective columns 10 a and 11 b are also provided with protective column support columns 11 a and 11 b on the upper surface of the rear body frame 2, and the upper surfaces of the support columns 11 a and 11 b are the floor surface of the cab 6. Are attached to the mounting seats 12a and 12b.
[0010]
  The protective pillars 10a and 10bThe support pillars 11a and 11bThe mounting seats 12a and 12b of the support pillars 11a and 11b have flange surfaces having a plurality of bolt holes,InThe flange surfaces 13a and 13b are provided at the lower ends of the protective pillars 10a and 10b and have substantially the same shape as the flange surfaces.TheThis is done by placing and bolting.
[0011]
  By the way, since the protective pillars 10a and 10b are installed on the side of the cab 6,Flange surface 13a, 13bNaturally, the distance between the two is affected by the width dimension of the cab 6. The cab 6 has a sufficient size in order to ensure sufficient space around the driver's seat and ensure a comfortable and safe driving operation for the driver, and tends to be relatively widened.
[0012]
  Moreover, since the protective pillars 10a and 10b have a structure that can withstand a large impact when the vehicle falls, the cross-sectional area must be increased as the vehicle becomes larger.Of support pillars 11a and 11b for protective pillarsThe distance between the mounting seats 12a and 12b is further increased by increasing the size of the vehicle.
[0013]
On the other hand, the vehicle body frames 1 and 2 at the front and rear portions expand in the width direction and the front and rear direction if the vehicle is simply scaled up to enlarge the blind spot region resulting from the relationship between the driver and the vehicle body. Therefore, it is considered that the rear body frame 2 does not expand in the width direction and the front-rear direction as much as possible.
[0014]
  For this reason, in a large working vehicle such as the prior art, the distance between the outer surfaces of the left and right protective pillars 10a, 10b is often larger than the width of the rear body frame 2. Moreover, as mentioned above, the protectionSupport for pillarThe positions of the column mounting seats 12a and 12b are higher than the upper surface of the rear body frame 2, and the protective column support columns 11a and 11b are reversely opened from the upper left and right side surfaces of the rear body frame 2 to the left and right upwards. It is erected in a C shape.
[0015]
[Problems to be solved by the invention]
As described above, in the prior art, the left and right protective pillars 10a and 10b are mounted on the rear vehicle body via the left and right protective pillar support pillars 11a and 11b that rise obliquely in the shape of an inverted C on the upper and left sides of the frame 2. Since the support structure to be supported by the frame 2 is adopted, when the protection pillars 10a and 10b are erected, the protection pillar support pillars 11a and 11b are attached to the upper surface portion of the frame 2, and further, the protection pillar support is provided. Since it is necessary to attach the protective pillars 10a and 10b to the pillars 11a and 11b on the frame 2, the production process and work process increase, leading to not only inferior productivity but also an increase in production cost.
[0016]
By the way, the upper surfaces of the protective column support columns 11a and 11b that are erected obliquely upward from the horizontal surface of the rear body frame 2 and the upper surface of the frame 2 that supports the support columns 11a and 11b are positioned on the same vertical line. Therefore, the protective column support columns 11a and 11b receive a shearing force due to the load of the protective columns 10a and 10b. For this reason, if the same steel material is used, the mounting structure of the protective support columns 11a and 11b and the rear body frame 2 is complicated, and the cross-sectional shape and size of the protective support columns 11a and 11b are inevitably required. Complicated and increased in size, the protective support pillars 11a and 11b are increased in the amount and weight.
[0017]
The present invention has been made to solve such conventional problems, and its specific object is to ensure the rigidity of the protective column, to ensure the safety of the vehicle driver, and to assemble with a simple mounting structure. An object of the present invention is to provide a large work vehicle having a protective column that is excellent in performance.
[0018]
[Means for solving the problems and effects]
The object is achieved by the inventions described in claims 1 to 3 of the present application.
The designer of this type of large work vehicle naturally takes care not to spread the vehicle body in the width direction or the front-rear direction as much as possible in order to secure the driver's field of view, but the vehicle body is inevitably more than a general model. It is forced to spread in the width direction or the front-back direction.
[0019]
On the other hand, a cab having a driver's seat is sufficient if a sufficient and sufficient space is ensured to ensure a comfortable and safe driving operation for the driver, and even if the vehicle is enlarged, the dimensions of the cab Is not much different from that of ordinary vehicles. As a result, the increase in the distance between the protection columns arranged on the left and right side portions of the cab also remains a relatively small increase, such as an increase in the cross-sectional area of the protection column itself due to an increase in impact at the time of falling due to an increase in size of the vehicle.
[0020]
Therefore, when the vehicle is further increased in size, the distance between the outer surfaces of the protective pillars is wider than the width of the vehicle body frame, but the difference between the two is smaller than that of the conventional model. For this reason, when the said protection pillar is extended further below the floor surface of a cab and is extended to the upper surface of a vehicle body frame, a considerable part of the base end of a protection pillar will be mounted in a vehicle body frame.
[0021]
Based on the above considerations, the present inventors have provided a mounting surface for placing a portion of the base end of the protective column that protrudes outside the vehicle body frame on the vehicle body frame, without using the support column for the protective column. Both considered that it would be possible to attach the protective column directly to the upper surface of the body frame.
[0022]
  That is, in the invention according to claim 1 of the present invention, a work machine, a body frame, a cab that is installed above the body frame and has a driver's seat, and a pair of left and right driving disposed on the left and right sides of the cab. A large-sized vehicle for construction and civil engineering provided with a person protection pillar, between the cab and the body frameHave a certain heightA cab support column is interposed, and the base ends of the pair of left and right driver protection columns are fixed to the upper surface of the vehicle body frame, and the rigidity that connects both columns between the pair of left and right driver protection columns is provided. A holding member is installed, and the rigid holding member is, Substantially the same height as the cab support pillar,A large working vehicle characterized by being disposed between an upper surface of the vehicle body frame and a substantially floor surface of the cab.
[0023]
According to such a configuration, the upper surface of the vehicle body frame is provided with a mounting surface that is wide enough to secure the protective pillars arranged on the left and right sides of the cab, and the base end of the protective pillar is the vehicle body Since it is directly fixed to the upper surface of the frame, it is not necessary to attach the support column support column to the upper surface of the vehicle body frame as in the prior art. For this reason, the structure for attaching the protective pillar to the vehicle body frame is simplified, the work of attaching the protective pillar support pillar is facilitated, and the productivity can be improved.
[0024]
In addition, since a considerable portion of the attachment surface of the protective pillar provided on the upper surface of the body frame is originally the upper surface of the vehicle body frame, there are not so many portions newly provided as the attachment surface. Therefore, even if the mounting surface of the protection pillar is installed on the body frame, the protection pillar can be strongly supported without extremely increasing the amount of the body frame member.
[0025]
By the way, even when the supporting column for the protective column is eliminated and the base end of the protective column is directly fixed to the upper surface of the vehicle body frame, the height of the driver's seat has been conventionally increased to ensure the driver's view. Therefore, the mounting height of the cab can hardly be changed. Therefore, the upper end position of the protective column arranged on the left and right sides of the cab is not changed. For this reason, the height of the protective column from the upper surface of the vehicle body frame to the cab floor surface is longer than that of the conventional case because the protective column support column is omitted.
[0026]
In such a case, if the cross-sectional structure of the protective column is the same as that of the conventional case and the length of the protective column is simply increased, when the vehicle falls and a shear load is applied to the protective column, the protective column A bending moment corresponding to the length of the protective column is further applied in the vicinity of the base end portion of. For this reason, when an external force exceeding the allowable stress of the protective column acts on the vicinity of the base end portion of the protective column due to the increase in the bending moment, the protective column is bent or broken.
[0027]
However, as a countermeasure, for example, if the plate material of the protective column is simply thickened, its cross-sectional shape is changed, or its cross-sectional area is increased, the manufacturing equipment for the protective column is changed, or the members of the protective column The volume will increase significantly, and the vehicle price will be greatly affected.
[0028]
Therefore, in the present invention, in order to solve such a problem, a rigid holding member for connecting the protective column is provided between the pair of left and right protective columns.
With this configuration, the guard column is supported by the base end portion thereof and the construction part of the rigid holding member. Therefore, when a shear load is applied to the guard column, the guard column directly affects the magnitude of the bending moment. The length is substantially shortened, and the other guard column receives a part of the shear load via the rigid holding member, so that the bending moment of the guard column to which the shear load is directly applied is reduced. Can be made. The rigid holding member may be a relatively simple member such as a thin steel plate or a steel beam as long as it functions to reduce the bending moment by firmly connecting the protective columns. Without increasing the amount of members, it is possible to ensure the proof strength of the protective column against the shear load.
[0029]
  The rigid holding member needs to be installed at a position where the bending moment of the protective column when the vehicle receives a shear load when the vehicle falls as described above is sufficiently small. It must be installed in a position where it will not be obstructed.
[0030]
  The yield strength of the protective column against the shear load may be the same as before, and the bending moment changes in proportion to the length of the protective column, so the length from the construction part of the rigid holding member to the upper end of the protective column However, it is sufficient that the rigid holding member is installed at a position where the length of the protection column is equivalent to the length of the protection column when the protection column is attached to the support column protruding from the upper surface of the conventional body frame.
[0031]
  For this reason, in this configuration, the rigidity holding member is provided at a position where the protective column extends below the lower part than the conventional case, that is, below the floor surface of the driver's seat. It can be ensured equally, and the construction of the rigid holding member does not impair the safety of operation.
[0032]
  According to the second aspect of the present invention, a cab floor support column mounting portion is installed at an upper end of the cab support column, and a pair of left and right driver protection column mounting seats are installed on the upper surface of the vehicle body frame. The large work vehicle.
  In such a configuration, a protective column mounting seat made of a steel plate having a plurality of bolt holes is installed on the upper surface of the body frame as a fixed portion of the protective column. On the other hand, a seat having a bolt hole formed at a position corresponding to the mounting seat is also fixed to the base end of the guard post, and the base of the guard post is fixed to the upper surface of the body frame. It is placed directly on the seat and fixed by a fixing member such as a bolt.
[0033]
  Therefore, since the protection column is directly attached to the upper surface of the vehicle body frame without using the support column support column for the upper surface of the vehicle body frame, it is possible to simplify the mounting operation of the protection column as compared with the conventional case. Since the protective column can be freely removed from the vehicle body frame, if the protective column is damaged when the vehicle falls, the protective column can be easily replaced or repaired, and the vehicle can be maintained more easily than before. Needless to say, it can be secured.
[0034]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.
FIG. 1 is a top view of a vehicle body frame of a large working vehicle according to a typical embodiment of the present invention, and FIG. 2 is a side view of the periphery of a driver's seat of a vehicle directly provided with a driver protection column on the top surface of the vehicle body frame. FIG. 3 shows a rear view of the same. In these drawings, the same members and the like as those of the prior art shown in FIGS. 4 to 6 are denoted by the same reference numerals.
[0035]
In a large work vehicle, when the vehicle is manufactured as one body, the height and weight of the public road are often restricted during transportation. For this reason, it is common practice to divide and manufacture the vehicle body and vehicle accessory equipment, divide and transport to the work site as height and weight to avoid restrictions on the public road surface, and assemble at the work site. The trend is becoming more pronounced with the recent increase in the size of work vehicles.
[0036]
Also in this embodiment, the vehicle main body is divided into a front part and a rear part. Therefore, as shown in FIG. 1, the vehicle body frame also corresponds to the vehicle main body and corresponds to the front vehicle body frame 1 and the rear vehicle body. It is manufactured separately from frame 2. At the rear end of the front body frame 1 and the front end of the rear body frame 2, vehicle body connecting portions 3, 4 are respectively provided so that the vehicle can be easily assembled at a transportation destination such as a construction site. It has been. A coupling hole is formed in a substantially central portion of each vehicle body connecting portion 3, 4. By inserting the hinge pin 5 in a state where the centers of the coupling holes of the respective connecting portions 3, 4 are aligned, The frames 1 and 2 are hinged.
[0037]
Vehicle accessories are often attached to the front and rear body frames 1 and 2, and the rear body frame 2 has a driver seat as one of the accessory equipments as shown in FIGS. A cab 6 is provided. The cab 6 is installed upright on the upper surface of the vehicle body frame 2 so that the visibility of the driver is not impaired by the spread in the width direction and the front-rear direction of the vehicle body due to the increase in size of the vehicle. In addition, the height of the driver's seat in the cab 6 is considered to be a height suitable for the driver's safety work by being attached to the four cab support pillars 7a to 7d on the front, rear, left and right sides.
[0038]
Specifically, the installation of the cab 6 is carried out by installing seats 9a to 9d protruding downward from the floor surface of the cab 6 and mounting seats 8a to 8a provided on the upper surfaces of the cab support columns 7a to 7b. This is performed by fixing the substantially central portion of 8d with a fixing member such as a bolt.
[0039]
Here, when the work vehicle is used in an environment where there are many irregularities on the ground, such as mines for earth and sand and rocks, the vehicle falls and the cab 6 is damaged, in other words, the driver is damaged. For this reason, the right and left side portions of the cab 6 are provided with driver cylinders 10a and 10b having a substantially rectangular tube shape, so that the driver is protected from an impact when the vehicle falls. ing.
[0040]
The interval between the left and right protection columns 10a and 10b is inevitably because the protection columns 10a and 10b are arranged on the left and right sides of the cab 6 and have a substantial cross-sectional area so that they can withstand a shear load when the vehicle falls. Therefore, the distance between the outer surfaces of the protective pillars 10a and 10b is increased. On the other hand, in designing the vehicle body frame 2, consideration is given so as not to widen in the width direction or the front-rear direction as much as possible in order to secure a view below the driver.
[0041]
For this reason, in the conventional model, the interval between the protective columns 10a and 10b is often wider than the width of the vehicle body frame 2. In order to attach the protective columns 10a and 10b, for example, as described, the vehicle body frame 2 It was forced to set up the support pillars for reverse pillars on the upper and left sides.
[0042]
On the other hand, even in the working vehicle of the present embodiment shown in FIGS. 1 to 3, the distance between the protective columns 10a and 10b is directly influenced by the size of the cab 6, and the size of the cab 6 is determined by the driver. Since it is sufficient to secure a necessary and sufficient space for guaranteeing comfortable and safe driving work, the left and right width dimensions of the cab 6 do not vary so much even when the working vehicle is enlarged, and the protective column The increase in the distance between the outer surfaces of 10a and 10b is limited to a relatively small increase, that is, an increase in the cross-sectional area of the protective columns 10a and 10b itself due to an increase in impact at the time of falling due to an increase in the size of the vehicle.
[0043]
However, an increase in the size of the vehicle necessarily entails an increase in the size of the body frame. In this embodiment, although the interval between the outer surfaces of the protective columns 10a and 10b is wider than the width interval of the body frame 2, the interval between the inner surfaces of the protective columns 10a and 10b is the conventional model. There is no change as much as the difference. For this reason, when the protection pillars 10 a and 10 b are extended to the upper surface of the vehicle body frame 2, a considerable portion of the base ends of the protection pillars 10 a and 10 b is placed on the vehicle body frame 2.
[0044]
Although part of the base ends of the protective pillars 10a and 10b will still protrude outside the body frame 2, the protruding part of the protective pillars 10a and 10b is supported on the side of the upper surface of the body frame 2. If the attachment surface for making it provide is provided, it is possible to attach the said protection pillars 10a and 10b directly to the upper surface of the vehicle body frame 2, without passing through the support pillar support pillar for protection like the past.
[0045]
The protection pillars 10a and 10b are attached to the vehicle body frame 2 with protection pillar attachment seats 14a and 14b on the upper surface of the vehicle body frame 2 having a plurality of bolt holes, and attachment seats 15a and 15b at the lower ends of the protection pillars 10a and 10b. Is performed by bolting.
[0046]
As described above, in this embodiment, the protective pillars 10a and 10b and the vehicle body frame 2 are directly coupled to each other, so that the mounting structure between the two is simplified and the conventional protection to the upper surface of the vehicle body frame 2 is required. Since the step of attaching the pillar support pillars is omitted, the number of steps for attaching the protective pillars 10a and 10b is reduced, leading to an improvement in vehicle productivity.
[0047]
Since the protective pillars 10a and 10b and the vehicle body frame 2 are fixed via the mounting seats 14a and 14b; 15a and 15b, the protective pillars 10a and 10b can be easily detached from the vehicle body frame 2. Furthermore, the assembly can be easily performed. In addition, even when the protective pillars 10a and 10b are damaged due to the fall of the vehicle, the protective pillars 10a and 10b can be easily replaced, so that maintainability higher than that of the conventional can be ensured.
[0048]
Incidentally, even when the base ends of the protective pillars 10a and 10b are directly attached to the upper surface of the vehicle body frame 2, the cab 6 does not change its height in order to secure the driver's field of view. The lengths of the pillars 10a and 10b are longer than the conventional model because the protective pillar support pillar is omitted, in other words, the height from the upper surface of the body frame 2 to the floor surface of the cab 6 becomes longer.
[0049]
Then, when the vehicle falls and a shear load is applied to the protective pillars 10a and 10b, a bending moment corresponding to the extension of the protective pillars 10a and 10b extends near the fulcrum of the protective pillars 10a and 10b. If the thickness or column cross-sectional area is the same as that of the conventional protective columns 10a and 10b, the proof strength against the shear load is reduced.
[0050]
However, if the members of the protective pillars 10a and 10b are simply made thicker or the cross-sectional area of the pillars is increased, the number of members of the vehicle body frame 2 can be reduced by eliminating the folding pillars and the supporting pillars for the protective pillars 10a and 10b. Since the amount of members of the entire vehicle is almost the same as that of the conventional vehicle or may increase in some cases, the cost of the material does not mean that the structure of the body frame 2 is simplified.
[0051]
Therefore, in the present embodiment, the left and right protective columns 10a are provided in order to ensure the necessary proof strength against the shear load without increasing the thickness of the protective columns 10a, 10b or changing the cross-sectional structure thereof. A rigid holding member 16 for connecting the protective pillars 10a and 10b is installed between 10b and 10b.
[0052]
Since the rigid holding member 16 is installed, the base end portions of the protection columns 10a and 10b and the installation portion of the rigidity holding member 16 serve as fulcrums of the protection columns 10a and 10b, so that a shear load is applied to the protection columns 10a and 10b. The bending moment generated in the vicinity of the fulcrum when applied can be reduced. For this reason, it is possible to ensure the proof strength against the shear load without increasing the amount of the protective columns 10a and 10b.
[0053]
In the present embodiment, the rigid holding member 16 employs a horizontal plate-shaped steel plate. For example, instead of the steel plate, two beam-shaped steel members are bridged between the left and right protective columns. Or other shapes and forms, such as hollowing the central portion of the steel plate that does not directly contribute to the reduction of the bending moment of the protective pillars 10a and 10b, or further laying a plurality of the steel plates. Even when the shear load is applied, it is sufficient that the construction part of the rigid holding member 16 acts as a fulcrum of the protective pillars 10a and 10b. I can't.
[0054]
In addition, when installing the rigidity holding member 16 on the protection columns 10a and 10b, the rigidity holding member 16 is installed at a position that appropriately secures the resistance against the shear load of the protection columns 10a and 10b. It must be in a position that does not obstruct the person's view.
[0055]
Here, the strength of the protective columns 10a and 10b against the shear load when the rigid holding member 16 is installed is the same as that when the protective columns 10a and 10b are attached by a support column erected from the upper surface of a conventional vehicle body frame. It is sufficient if the protective pillars 10a and 10b have the same resistance to the shear load.
[0056]
That is, since the bending moment when the shear load is applied changes in proportion to the length of the protective columns 10a and 10b, the length from the construction part of the rigid holding member 16 to the upper ends of the protective columns 10a and 10b. However, when the protective pillars 10a and 10b are attached to the support pillars protruding from the upper surface of the conventional body frame 2, the rigid holding member 16 may be installed so as to be equivalent to the length of the protective pillars 10a and 10b. Become. For this purpose, the rigid holding member 16 may be installed under the protective pillars 10a and 10b corresponding to the installation positions of the conventional support pillars.
[0057]
If the rigid holding member 16 is installed in this way, the rigid holding member 16 is provided below the floor surface of the cab 6 that is a blind spot of the driver, that is, below the floor surface of the driver seat. The installation of the rigid holding member 16 does not hinder the driver's view.
[Brief description of the drawings]
FIG. 1 is a structural explanatory view showing an upper surface of a body frame of a working vehicle according to the present invention.
FIG. 2 is a structural explanatory view showing a side surface around a driver's seat of a working vehicle provided with a protective column on the upper surface of the body frame.
FIG. 3 is a structural explanatory view showing a rear surface around the driver's seat of the working vehicle.
FIG. 4 is a structural explanatory view showing an upper surface of a body frame of a conventional working vehicle.
FIG. 5 is a structural explanatory view showing a side surface around a driver's seat of the working vehicle.
FIG. 6 is a structural explanatory view showing a rear surface around the driver's seat of the working vehicle.
[Explanation of symbols]
      1 Front body frame
      2 Rear body frame
      3 Front body frame connecting part
      4 Rear body frame connecting part
      5 Hinge pin
      6 Cab
      7a-7b Support pillar of cab
      8a to 8d Cab support column Cab mounting seat
      9a-9d Cab floor support column mounting part
      10a, 10b Driver protection pillar
      11a, 11b Guard pillar support pillar
      12a, 12b Guard pillar support pillar mounting seat for guard pillar
      13a, 13b Guard column lower end support column mounting part
      14a, 14b Body frame upper surface protection column mounting seat
      15a, 15b Guard column bottomMounting seat
      16 Rigidity holding member

Claims (2)

For construction and civil engineering, etc., comprising a work machine, a body frame, a cab having a driver's seat installed above the body frame, and a pair of left and right driver protection pillars arranged on the left and right sides of the cab Large work vehicle,
A cab supporting column having a certain height is interposed between the cab and the vehicle body frame,
The base ends of the pair of left and right driver protection pillars are fixed on the upper surface of the body frame,
Between the pair of left and right driver protection columns, a rigid holding member that connects both columns is installed,
The rigid holding member has substantially the same height as the cab support pillar, and is arranged between the upper surface of the body frame and the substantially floor surface of the cab.
A large work vehicle characterized by the above. The work floor according to claim 1, wherein a cab floor support column mounting portion is installed at an upper end of the cab support column, and a mounting seat for the pair of left and right driver protection columns is installed on an upper surface of the vehicle body frame. Large vehicle.

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