JPS5830848Y2 - Mounting structure of arm drive device for excavation work on excavation work vehicle - Google Patents

Description

[Detailed description of the invention] This invention is based on a swivel platform that is installed on the vehicle body so that it can be rotated and fixed freely around the vertical axis, and an arm for excavation work that can swing vertically and freely bend and extend. The present invention relates to an excavation work vehicle that is swingably and fixedly provided by a pressure cylinder, and specifically relates to an improvement in the mounting structure of an excavation work arm drive device in the excavation work vehicle.

In the conventional mounting structure of this kind, the base end side shaft of the fluid pressure cylinder was provided on a reinforcing member erected on the swivel base in order to attach the arm to the swivel base, so it was difficult to drive the swivel base. Along with this, the reinforcing members are likely to be deformed or damaged due to the strong rocking inertia of the working arm that acts on the fluid pressure cylinder, and if the reinforcing members are to have sufficient strength, it is necessary to have a strong structure or structural members. As a result, the structure becomes complicated and the manufacturing cost increases, and the vertical axis for swinging the excavation work arm by this hydraulic cylinder has to be changed. A structure that is supported by a member separate from the swivel table also has the same problems in terms of strength and economy as described above.

In view of the above-mentioned circumstances, the present invention has been proposed to improve the mounting structure of the arm drive device for excavation work with an extremely simple structure that effectively utilizes the strength members inherent in the excavation work vehicle. The purpose is to rub it so that it can be obtained.

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

A swivel base 3 is provided on a vehicle body equipped with a crawler-type traveling device 1, which can be fully rotated and fixed around the vertical axis by a hydraulic motor 2 and a slewing race 22, and this swivel base 3 is equipped with a hydraulic boom cylinder 4 and a hydraulic arm. A working arm 7 consisting of a boom portion 7a and an arm portion 7b, which can swing up and down and bend and extend around a horizontal axis by a cylinder 5, and can swing and fix around a vertical axis 13 by a hydraulic swing cylinder 6. A bucket) 10, which can be vertically swung and fixed around a horizontal axis, is attached to the tip of the arm 7 using a hydraulic tilt cylinder 8 and a link mechanism 9.
By setting a fixed angle around the vertical axis relative to the vehicle body, it is possible to dig side ditches, and a soil removal plate 25 is attached to the tip of an arm 24 that can swing vertically by a hydraulic lift cylinder 23 extending from the vehicle body. This is an excavation work vehicle that is equipped with a

In order to make the working arm 7 swingable around the vertical axis with respect to the swivel base 3, the base end of the boom portion 7a is aligned with the horizontal axis 1.
A boom bracket 11 is pivotally connected to the swivel base 3 and an upright bracket 26 from the swivel base 3 via a vertical axis 13 inserted through the swivel base 3, thereby increasing the strength of this structural part. I have to.

To erect the swing cylinder 6, on the working arm side, the distal end boss 14 is supported by a vertical support shaft 16 that is inserted through and locked into two bearing brackets 15 and 15 attached to the boom bracket 11. On the swivel base side, a bearing portion 2 that directly connects the proximal boss 18 to the swivel base 3
0 and a vertical shaft support shaft 19 inserted through a bearing bracket 17 attached to an upright bracket 26 from the swivel base 3, thereby reducing the force acting on the cylinder 6 when the swivel base 3 is operated. It is configured so that it is received by the swivel table 3, which is inherently strong, so that the support structure on the base end side of the cylinder 6 can be simplified and costs can be reduced.

In the figure, reference numeral 21 denotes a reinforcing knob for the bearing bracket 17, which is provided between the bearing bracket 17 and the swivel base 3.

In addition, as the swing cylinder 6, various types of cylinders such as a pneumatic type as well as a hydraulic type may be used.
These are collectively referred to as a fluid pressure cylinder 6.

The bracket 17 for the base end side of the cylinder 6 may be attached only to the swivel base 3 without being connected to the arm 7 attachment bracket 26.

In short, the mounting structure of the arm driving device for excavation work according to the present invention is such that in the excavation work vehicle described at the beginning, the vertical axis is supported by a swivel base and an erected bracket from the swivel base, and The base end side pivot shaft of the fluid pressure cylinder is attached by a bearing portion directly connected to the swivel base and a bearing bracket that is either directly attached to the swivel base or attached to an erected bracket from the swivel base. characterized by things.

In other words, the base end side shaft of the fluid pressure cylinder is supported by a bearing part and a bearing bracket that are directly connected to the swivel table, and the vertical axis of the working arm swing is also connected to the swivel table and the seven vertical rackets. The arm drive device for excavation work can be installed without deformation or damage, since the force acting on the cylinder and the swinging of the arm can be dealt with with the inherent strength of the swivel table. In addition, the supporting structure can be made simple and inexpensive.

[Brief explanation of the drawing]

The drawings show an embodiment of the mounting structure of the excavation work arm drive device in the excavation work vehicle according to the present invention, FIG. 1 is an overall side view of the work vehicle, FIG. 2 is a side view showing the main parts, and FIG. 3 FIG. 2 is a plan view showing main parts. 3...Swivel base, 6...Fluid pressure cylinder, 7...Work arm, 13...Vertical axis, 17... Bearing bracket, 19...
... Proximal side shaft support shaft, 20 ... Bearing part, 26 ...
...Standing bracket.

Claims (1)

[Scope of utility model registration request] An excavation work arm 7 that can swing up and down and bend freely is swung and fixed around a vertical axis 13 by a hydraulic cylinder 6 on a swivel table 3 that is installed on the vehicle body so that it can be driven, rotated, and fixed around a vertical axis. The excavation work vehicle is freely provided with the vertical axis center 13
is supported by the swivel base 3 and an erected bracket 26 from the swivel base 3, and the base end side shaft support shaft 19 of the fluid pressure cylinder 6 is a bearing portion directly connected to the swivel base 3. 20, and a bearing bracket 17 that is directly attached to the swivel base 3 or attached to an upright bracket 26 from the swivel base 3. Mounting structure.