JP2004142730A - Work vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a work vehicle provided with an ROPS canopy having a simple structure and capable of reducing manufacturing cost and improving maintenance property. <P>SOLUTION: This work vehicle is provided with a counterweight 1 provided with extension parts 11, 12 extending to the front and side and having lower part mounting seats 11a, 12a on the left and right sides in a lower part and a canopy mounting seat 16 formed in an upper part. The counterweight 1 is attached to a frame 5 by the lower part mounting seats 11a, 12a, and the canopy 2 is attached to the counterweight 1 through the canopy mounting seat 16. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a work vehicle.
[0002]
[Prior art]
FIG. 7 shows an example of a small excavation work vehicle frequently used in urban civil engineering and the like. The small excavation work vehicle has a canopy 200 at the same time as disposing a counterweight 100 for balancing the vehicle against the load applied to the work device on the side opposite to the mounting position of the work device 90. However, in recent years, as the demand for improved safety has increased, in order to ensure the safety of the operator when the vehicle falls, a driver protection structure that meets the strength standard defined by the ISO standard or the like, that is, ROPS (Roll-over Protective Structure). ) Is increasingly required.
[0003]
FIG. 8 is an exploded perspective view showing an example of a conventional ROPS canopy mounted on a small excavator. As shown in FIG. 8, a ROPS canopy is constructed by attaching a ROPS canopy support member 110 having a sheet metal structure to a frame 150 and attaching a canopy 210 having a sheet metal structure to the ROPS canopy support member 110 to have a specified strength. (For example, see Non-Patent Document 1).
[0004]
For example, as shown in FIG. 9, the counterweight 120 extends upward, and a support member 221 that supports the canopy 220 is provided at the upper end of the counterweight 120 to support the canopy 220. Some are also known (for example, see Patent Document 1).
[0005]
[Non-patent document 1]
"Bobcat, Model 56 Hydraulic Excavator Parts Manual," Melloe Company, November 1986, p. A3
[Patent Document 1]
JP-A-10-140607 (pages 2-5, FIG. 1-6)
[Problems to be solved by the invention]
However, since the conventional ROPS canopy support member 110 as shown in FIG. 8 has a sheet metal configuration, the structure for supporting the ROPS canopy 210 has a complicated structure in order to secure a specified strength, and There is a problem in that the increase in weight significantly increases the manufacturing cost.
[0006]
Further, an engine (not shown) is provided at a rear portion of the ROPS canopy support member 110 shown in FIG. 8, but the ROPS canopy support member 110 obstructs work for performing inspection, maintenance, and the like of the engine. And there is a problem with the maintainability of the engine.
[0007]
Further, the counterweight 120 as shown in FIG. 9 has the counterweight 120 extending upward, so that the center of gravity of the counterweight 120 can be moved toward the rear end side, and the stability during operation is improved. However, since the counterweight supporting the ROPS canopy is not a structure that satisfies the specified strength, the canopy 220 cannot form the ROPS canopy.
[0008]
The present invention has been made in view of the problems of the conventional structure described above, and has as its object to provide a work vehicle having a ROPS canopy with a simple structure and capable of reducing manufacturing costs and having improved maintainability. I have.
[0009]
Means for Solving the Problems, Functions and Effects
In order to achieve the above object, a first invention according to the present invention provides:
An extension portion extending forward and laterally to the left and right of the lower portion and having a lower mounting seat, and a counter weight including a canopy mounting seat formed on the upper portion,
A work vehicle, wherein the counterweight is attached to the frame by the lower attachment seat, and a canopy is attached to the counterweight via the canopy attachment seat.
[0010]
According to the first aspect of the present invention, the counterweight of the work vehicle is formed with an extended portion extending leftward and rightward forward and laterally at the lower portion, and the lower mounting seat is provided at the extended portion. The lower mounting seat can be attached to the frame.
[0011]
Therefore, since the counterweight is firmly fixed against external force by the extension portions extending forward and sideways, it is possible to secure a specified strength required as a pedestal of the ROPS canopy attached to the upper surface of the counterweight.
[0012]
Therefore, a two-post ROPS canopy having a better front view than a four-post can be manufactured with a lightweight and simple configuration.
[0013]
In a second aspect, in the first aspect,
The counterweight is characterized in that a rear outer surface is formed in a substantially arcuate surface around a vertical axis positioned forward.
[0014]
In a third aspect, in the first aspect,
The counterweight is characterized in that a maintenance opening is provided at a central portion.
[0015]
According to the third aspect of the present invention, since the maintenance opening is provided at the center of the counterweight, the oil level of the engine disposed in the engine room at the front of the counterweight is checked, and the filter is replaced. Can be easily performed.
[0016]
A fourth invention is the invention according to any one of the first invention to the third invention,
The counterweight is made of casting.
[0017]
According to the fourth aspect, since the counterweight is made of casting, it can be formed into a smooth shape that reduces stress concentration.
[0018]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of a work vehicle according to the present invention will be described in detail with reference to the drawings.
[0019]
FIG. 1 shows a side view of the appearance of a small excavating vehicle, which is an example of a work vehicle according to the present invention. As shown in FIG. 1, a counterweight 1 is provided at a rear end of a frame (not shown), and the counterweight 1 is provided with a load applied to a working device 9 provided at a front end of the frame. Plays a balancing function.
[0020]
FIG. 2 is a perspective view showing the configuration of the counterweight 1 and the canopy 2 placed on the counterweight 1. The counterweight 1 is made of a casting and the outer surface thereof is formed in a substantially arc shape, and an extension 11 extending to the left and an extension 12 extending to the right in a substantially arc are formed at a lower portion. A left lower mounting seat 11a, a right lower mounting seat 12a, and a central lower mounting seat 13a are formed at the distal end portion of the extension portion 12 and the lower portion 13 at the central portion, respectively. The counter weight 1 is mounted on the lower mounting seat 11a, the lower mounting seat 12a, and the lower mounting seat 13a, which are provided at positions substantially arcuately separated from each other, by the bolt 14, the bolt 15, and the bolt 16 by the frame 5 (two-dot chain line). ), So that it can be firmly fixed to the frame 5. Thus, when the vehicle falls, the force applied to the counter weight 1 and the ROPS canopy 2 attached to the upper surface of the counter weight 1 can be sufficiently received.
[0021]
The canopy 2 has a plurality of bolts 28 in a plurality of bolt holes 17 formed in the upper surface 16 of the counterweight 1 shown in FIG. 3 and a bolt hole 23A of the lower mounting bracket 23 of the canopy 2 shown in FIG. It is attached to the upper surface of the counterweight 1 by being inserted and tightened by a nut (not shown). And since the lower mounting bracket 23 is made of casting, the respective mounting portions 24a and 24b of the left column 21a and the right column 21b supporting the roof 22 are formed into a smooth shape for reducing stress concentration. Since the struts 21a and the struts 21b use straight, thick pipes, the canopy 2 can sufficiently secure the prescribed strength required for the ROPS canopy.
[0022]
In addition, as shown in FIG. 2, an inspection hole 18 is provided in the center of the counterweight 1. This facilitates operations such as checking the oil level of an engine (not shown) disposed in the engine room in front of the counterweight 1 and replacing the filter.
[0023]
Further, as shown in FIG. 4, the canopy 2 may be placed on the counterweight 1 via the spacer 3. That is, as shown in the partial cross-sectional view of FIG. 5, the spacer 3 is provided with a tap hole 31 for attaching a canopy and a tap hole 32 for attaching to a counter weight. The spacer 3 is attached to the counterweight 1 by a plurality of bolts 34. For this reason, the width of the abutment portion of the canopy 2 with the lower mounting bracket 23 can be increased by increasing the width of the spacer 3 without increasing the width of the canopy mounting seat 16 on the upper surface of the counterweight 1. It is possible to secure sufficient strength, and it is not necessary to increase the width of the canopy mounting seat 16 on the upper surface of the counterweight, so that the space 35 in the engine room is not narrowed.
[0024]
As shown in FIG. 4, the left and right ends of the spacer 3 are provided with a left-side mounting portion 3a and a right-side mounting portion 3b of the floor 4 to be described later. In FIG. 5, the floor 4 is provided at the front end as shown in FIG. 6, which shows a state in which the floor 4 is tilted by removing the bolts 34 which are screwed into the mounting tap holes 32 which attach the spacer 3 to the counterweight 1. With the hinge pin 41 of the tilt hinge set as a center, the tilt can be performed while being fixed integrally with the canopy 2. As a result, the space above the engine 36 is widely opened, so that inspection and maintenance work becomes very easy.
[Brief description of the drawings]
FIG. 1 is a side view showing an example of a work vehicle according to the present invention.
FIG. 2 is a perspective view showing a configuration of a counterweight and a canopy.
FIG. 3 is a perspective view of a counterweight.
FIG. 4 is a perspective view showing a configuration of a counterweight, a spacer, and a canopy.
FIG. 5 is a partial cross-sectional view showing a mounting portion for mounting a canopy on a counter weight via a spacer.
FIG. 6 is a diagram showing a state where the floor is tilted.
FIG. 7 is a side view showing an example of a work vehicle having a canopy.
FIG. 8 is an exploded view showing a configuration of a conventional ROPS canopy, a counterweight, and a frame.
FIG. 9 is a side view showing an example of a conventional work vehicle.
[Explanation of symbols]
1. . . 1. counter weight; . . 3. canopy; . . Floor, 5. . . Frame, 11, 12,. . . Extensions, 11a, 12a. . . Lower mounting seat, 16. . . 17. canopy mounting seat; . . Inspection hole (opening)

Claims (4)

An extension portion extending forward and laterally to the left and right of the lower portion and having a lower mounting seat, and a counter weight including a canopy mounting seat formed on the upper portion,
A work vehicle, wherein the counterweight is attached to the frame by the lower attachment seat, and a canopy is attached to the counterweight via the canopy attachment seat. 2. The work vehicle according to claim 1, wherein the counterweight is formed in a substantially arc-shaped surface around a vertical axis whose outer surface on the rear side is located forward. 3. The work vehicle according to claim 1, wherein the counterweight has an opening for maintenance at a central portion. The work vehicle according to any one of claims 1 to 3, wherein the counterweight is made of casting.

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