JP4519990B2 - Rotary joint rotation prevention structure - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention belongs to the technical field of rotary joints for construction machines.
[0002]
[Prior art]
Conventionally, a rotary joint is used between a lower traveling body and an upper swing body in a construction machine. This is because the hydraulic pump is provided on the upper swing body, and the hydraulic motor that rotates the drive wheels is provided on the lower travel body. Therefore, it is necessary to send hydraulic oil from the upper swing body to the lower travel body. This is to prevent twisting in the piping for sending.
The rotary joint is composed of an upper rotating portion and a lower rotating portion, and is a joint that allows fluid such as hydraulic oil to communicate even if both of them rotate together. However, if mutual rotation occurs between the upper rotating part and the upper rotating body or between the lower rotating part and the lower traveling body, the pipe is twisted. Therefore, a method in which the upper rotating part is fixed to the upper rotating body and the lower rotating part is fixed to the lower traveling body has been conventionally employed.
[0003]
A conventional rotary joint rotation prevention structure will be described below with reference to the drawings. FIG. 3 is a view showing a lower traveling body and a rotary joint of a construction machine using a conventional anti-rotation structure. FIG. 4 is a view showing a conventional rotary joint, and FIGS. 5A to 5C are views showing a conventional rotation prevention structure. In FIG. 3, crawlers 52 are provided on both sides of the lower traveling body 51. The crawler 52 is driven by a hydraulic motor (not shown) and travels. An upper turning body 54 is rotatably mounted on a fixed table 53 of the lower traveling body 51 via a bearing 55. The upper turning body 54 is turned by a turning motor (not shown).
[0004]
A rotary joint 56 is disposed between the upper swing body 54 and the lower traveling body. As shown in FIG. 4, the rotary joint 56 is composed of an upper rotating portion 56 a and a lower rotating portion 56 b, and a plurality of upper and lower oil passages not shown are provided inside. A pipe 57 is connected to the upper rotating part 56a, and a pipe 58 is connected to the lower rotating body. The lower rotating portion 56 b is fixed to a bracket 61 fixed to the fixed table 53. The upper rotating portion 56a is prevented from rotating with the upper swing body 54 by the rotation preventing structure 62 shown in FIG.
[0005]
FIG. 5 shows a conventional anti-rotation structure 62, (A) is a plan view, (B) is a side view, and (C) is a front view. In the figure, an angle-shaped bracket 65 is fixed by a bolt 66 so that the inner surface is in contact with the side surface circumferential portion of the upper rotating portion 56a. A rod-shaped member 67 is fixed to the outer convex portion of the bracket 65 by welding or the like. The rod-shaped member 67 is inserted into an opening 68 a provided inside the stopper 68, and the stopper 68 is fixed to the upper swing body 54. Therefore, the upper rotating portion 56a cannot rotate independently, and rotates simultaneously with the upper swing body 54. With the above configuration, the pipes 57 and 58 connected to the rotary joint 56 are not twisted.
[0006]
[Problems to be solved by the invention]
In the above conventional structure, since the bracket fixed to the rotary joint is inserted into the frame of the upper swing body, it is necessary to remove and re-fix the bracket 65 for repair or replacement. there were. For this reason, there has been a problem that the maintenance work of the rotary joint is complicated and troublesome.
The present invention has been made under the background as described above, and it is an object of the present invention to provide a rotary joint rotation prevention structure that is simple in structure and easy in maintenance work.
[0007]
In order to solve the above problems, the present invention employs the following means. That is, the invention described in claim 1 is a rotary joint of a construction machine in which a rotary joint is provided between the lower traveling body and the upper swing body, and torsion of piping accompanying the swing of the upper swing body is prevented. The lower rotating part of the upper rotating part is fixed to the lower traveling body, and a cutout hole is provided in the frame of the upper rotating body so that the upper rotating part of the rotary joint can penetrate in the axial direction. A bracket made of an angle-shaped member is arranged at the vertical position so that the inner side is in contact with the outer peripheral surface of the upper rotating part, and the bracket is fixed with a bolt at the height position, and the edge of the notch hole A locking portion for locking with the outer convex portion of the angle-shaped member and an adjustment space are provided at the portion, the rotation of the upper rotating portion and the rotation of the upper swing body are synchronized, and the angle shape The contact surface between the inner side and the upper rotating part of the member interdigitated shims is characterized in that the adjustable locking of the notch hole.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
1 and 2 show an embodiment of the present invention. Embodiments of the present invention will be described below with reference to the drawings. The same constituent elements as those of the conventional apparatus are denoted by the same reference numerals, and detailed description thereof is omitted. 1A shows a plan view, and FIG. 1B shows a side view. In FIG. 1, the lower rotating portion (not shown) of the rotary joint is fixed to the lower traveling body 51. An angle-shaped bracket 11 is fixed to the upper rotating portion 56 a by bolts 12. The frame 13 of the upper swing body 54 is provided with a notch hole 14. A part edge 15 of the cutout hole 14 is provided in a similar shape and close to the outer convex portion 16 of the bracket 11, and the bracket 12 collides with the rotation of the upper rotating portion 56a so that the bracket 12 cannot rotate. However, the partial edge 15 is formed so as to be freely movable in the rotation axis direction (vertical direction) while the bracket 11 is fixed to the upper rotation portion 56a.
[0011]
Spaces 17 for adjustment work for tightening or loosening the bolts 12 are provided on both sides of the edge 15 of the cutout hole 14. The gap between the outer convex portion 16 and the partial edge 15 of the bracket 11 can be freely adjusted by sandwiching a shim 21 as shown in FIG. The shim 21 is provided with a cut 22 as shown in FIG. 2B so that the shim 21 can be inserted with the bracket 11 attached.
[0012]
In the present embodiment, with the above-described configuration, the rotary joint 56 can be removed and attached while the bracket 11 is fixed to the upper rotating portion 56a, so that the work such as repair and replacement of the rotary joint 56 is facilitated. Is obtained. Further, since the space 17 is provided, it is easy to attach and detach the shim, so that the effect of preventing the rotation can be sufficiently obtained.
[0013]
Instead of providing the partial edge 15 on the frame, a steel piece having the same function may be fixed to the frame by welding or the like. Further, the bracket 11 is not limited to an angle, and may have another shape.
[0014]
The embodiments and examples of the present invention have been described in detail with reference to the drawings. However, the specific configuration is not limited to the examples, and there are design changes and the like without departing from the gist of the present invention. Are also included in the present invention. For example, although the embodiment using a bolt as a fixing means for the bracket has been described, the present invention is not limited to this and may be fixed by other means. Further, although the lower rotating part is fixed, the upper rotating part may be fixed.
[0015]
【The invention's effect】
As described above, according to the configuration of the present invention, since the bracket can be removed and attached while being fixed to the rotary joint, the effect of facilitating the repair and replacement of the rotary joint can be obtained. . Moreover, the effect that the function of preventing rotation can be sufficiently exhibited by interposing shims is also obtained.
[Brief description of the drawings]
FIG. 1 shows the overall configuration of the present embodiment. (A) is a plan view and (B) is a side view.
FIG. 2 shows a gap adjusting means of the present embodiment.
FIG. 3 shows a lower traveling body and an upper swing body of a conventional construction machine using a rotary joint.
FIG. 4 shows an entire conventional rotation prevention structure.
FIGS. 5A to 5C show details of a conventional anti-rotation structure.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 11 Bracket 12 Bolt 13 Upper revolving body frame 14 Notch hole 15 Partial edge 16 Outer convex part 17 Adjustment space 56 Rotary joint 56a Upper rotation part 56b Lower rotation part

Claims (1)

In a rotary joint of a construction machine in which a rotary joint is provided between the lower traveling body and the upper swinging body to prevent the twisting of the piping accompanying the turning of the upper swinging body, the lower rotating part of the rotary joint is fixed to the lower traveling body. A bracket formed of an angle-shaped member at the same height as the notch hole of the upper rotating part, provided with a notch hole through which the upper rotating part of the rotary joint can penetrate in the axial direction in the frame of the upper rotating body Is arranged so that the inner side is in contact with the outer peripheral surface of the upper rotating part, the bracket is fixed with a bolt at the height position, and the outer convex part of the angle-shaped member is formed on the edge of the notch hole. A locking portion for locking and a space for adjustment are provided, the rotation of the upper rotating portion and the rotation of the upper rotating body are synchronized, and the inner side of the angle-shaped member and the upper rotating portion Anti-rotation structure of a rotary joint, characterized in interdigitated shim that has adjustable locking of the notch hole on the contact surface.

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