JPS6111328Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a working arm mounting structure for a working vehicle in which an excavating work arm is attached to the body of the machine by a fluid pressure cylinder so as to be swingable around a vertical axis.

In the case of the above-mentioned work vehicle, generally, due to the digging reaction force, a large force is applied to the work arm in the direction of twisting it around the axis in the longitudinal direction of the machine,
There is a problem in that a large tensile or compressive force acts on the cylinder, and a large stress acts on the arm pivot part and cylinder connection part of the fuselage, easily causing damage. The purpose is to increase the strength of the connection between the arm and cylinder.

Next, embodiments of the present invention will be described based on the drawings.

A turning stand 2 is attached to a crawler type traveling machine stand 1 so as to be able to perform full turning operation, and a driving part 3 and a control part 4 are mounted on the turning stand 2, and a backhoe working arm 5 is mounted by a hydraulic cylinder 6. The dozer 7 is attached to be operable to swing around the vertical axis P, and the dozer 7 is attached to the traveling machine base 1 so that it can be operated up and down, thereby configuring a work vehicle that can perform excavation work and soil removal work alternatively. be.

The turning table 2 is constructed as follows.

That is, as shown in FIGS. 2 and 3, plate-shaped reinforcing ribs 9 in the longitudinal direction of the fuselage are provided on the front end sides of the left and right main frames 8, 8, respectively, in the longitudinal direction of the fuselage.
a, 9b are connected in such a manner that the opposing distance becomes larger toward the rear end of the fuselage, and both the left and right ribs 9
The front and rear intermediate parts of a and 9b are connected by a frame 10, and both the main frames 8,
8. A bottom plate 11 is provided across the lower surfaces of both the ribs 9a, 9b and the connecting frame 10, and a top plate 12 is provided across the upper surfaces of both the ribs 9a, 9b and the connecting frame 10. , which constitutes the main body, and which also serves as a sub-frame and front side wall forming member 1
3, and a flat plate member 14 forming a subframe
a, 14b and a channel member 14c attached to the main body, and a member 15 forming a lateral side wall.
a or 15b is connected to the subframe 13 or 14a, 14b, 14c.

A cylindrical member 16 for forming a pivot portion for the arm bracket 5a constituting the working arm 5 is connected by welding to the front end portions of the bottom plate 11, the top plate 12, and both reinforcing ribs 9a, 9b. Thus, even if a large torsional force is applied to the working arm 5 around the axis in the longitudinal direction of the machine body, the connection and support by the rotating table 2 are firmly performed.

Moreover, one side 9a of the ribs 9a, 9b and the bottom plate 11
A bending reinforcing member 17, which forms a hollow frame in cooperation with them, is connected by welding over almost its entire length, and the other end of the cylinder 6, whose one end side is pivotally supported by the arm bracket 5a. As shown in FIG. 4, the side is pivotally connected across the rear end of the reinforcing member 17 and the mounting member 18 attached to the rib 9a, so that large compressive or tensile forces are not applied to the cylinder 6. The structure is such that the rotation table 2 and the cylinder 6 are firmly connected even if the rotation force is applied.

The present invention is applicable to work vehicles equipped with work arms whose excavation form is different from the backhoe work arm, such as the face shovel type, and work where the work arm is attached to the traveling machine base 1 so that it cannot be rotated. It can also be applied to a car, and the arm 5 for backhoe work will be referred to as the arm 5 for excavation work, and the excavation work arm 5 will be referred to as the machine body 2.

In summary, the present invention, in the above-mentioned working arm mounting structure for a working vehicle, allows the pivot portion 16 for the working arm 5 to be placed between the bottom plate 11 and the top plate 12 of the body 2 toward the side of the body 2. A pair of left and right reinforcing ribs 9 installed with a large relative spacing
a, 9b and the bottom plate 11, a bending reinforcing member 17 which cooperates with them to form a hollow frame extending substantially over the entire length of the rib 9a is connected by welding over substantially the entire length thereof, and One end of the cylinder 6 is connected to the rib 9a.
A mounting member 18 attached to the reinforcing member 17 is pivotally connected to the reinforcing member 17.

In other words, according to the above configuration, even if a large torsional force as described above acts on the working arm 5, the pair of reinforcing ribs 9a and 9b whose facing distance becomes wider as the distance from the pivot portion 16 increases. As a result, the arm 5 can now be firmly supported by the fuselage 2, and even if a large tensile or compressive force is applied to the cylinder 6, the long reinforcing member 17 can be welded over almost its entire length. By doing so, it has become possible to avoid the inconvenience of cracks or disconnection occurring due to stress concentration at the cylinder connection part of the fuselage 2, and in turn, the strength of the connection between the arm 5 and the cylinder 6 to the fuselage 2 can be increased. This makes it possible to excavate hard ground and dig up large amounts of earth and sand at once.
Ivy helps you work more efficiently.

Furthermore, since the reinforcing member 17 forms a hollow frame between the reinforcing ribs 9a and the bottom plate 11, the bottom plate has a hollow frame shape, thereby making the bottom plate itself thin and lightweight. It has the advantage of being easy to understand.

Moreover, a pair of reinforcing ribs 9a, 9b, and
A simple modification of simply providing the reinforcing member 17 in the above-mentioned arrangement or welding state is sufficient, which is advantageous in terms of cost and manufacturing.

[Brief explanation of the drawing]

The drawings show an embodiment of the working arm attachment structure of a working vehicle according to the present invention, and FIG. 1 is an overall side view of the working vehicle, FIG. 2 is a plan view of the front part of the rotating platform, and FIG. Figure 2 is a cross-sectional view taken in the direction of the arrow, and Figure 4 is a - cross-sectional view of Figure 3.
FIG. 2...Body, 5...Arm, 6...Cylinder,
9a, 9b...rib, 11...bottom plate, 12...top plate, 16...pivotal support, 17...reinforcement member, 18...
...Mounting member, P...Axis core.

Claims (1)

[Scope of utility model registration request] A working arm attachment structure for a working vehicle in which an excavating working arm 5 is attached to a body 2 so as to be swingable around a vertical axis P by a fluid pressure cylinder 6, in which a pivot support 16 for the working arm 5 is provided. The reinforcing ribs 9a, 9b are attached to the tips of a pair of left and right reinforcing ribs 9a, 9b, which are attached between the bottom plate 11 and the top plate 12 of the fuselage 2, with the relative spacing increasing toward the fuselage 2. A bending reinforcing member 17 that cooperates with one side and the bottom plate 11 to form a hollow frame spanning almost the entire length of the rib 9a,
A working vehicle characterized in that the cylinders 6 are connected by welding over almost their entire length, and one end side of the cylinder 6 is pivotally connected to the reinforcing member 17 and a mounting member 18 attached to the rib 9a. Work arm attachment structure.