JP2001323509A - Detent structure of rotary joint - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rotary-joint detent structure in which maintenance works are also facilitated by simplifying the structure. SOLUTION: In construction machinery in which the rotary joint is installed between a lower traveling body and a revolving super structure and the torsion of a piping is prevented, one is fixed onto the lower traveling body or the revolving super structure and a bracket is fixed onto the other in the upper rotary section and lower rotary section of the rotary joint, and a notched hole, which prevents free revolution by retaining to the bracket and into which the rotary joint is penetrated freely in the axial direction, is formed to the other of the lower traveling body or the revolving super structure.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention belongs to the technical field of rotary joints for construction machines.

[0002]

2. Description of the Related Art Conventionally, in a construction machine, a rotary joint has been used between a lower traveling structure and an upper revolving structure.
This is because it is necessary to send hydraulic oil from the upper revolving unit to the lower traveling unit because the hydraulic pump is provided on the upper revolving unit and the hydraulic motor that rotates the drive wheels is provided on the lower traveling unit. This is to prevent twisting of the pipe for sending. The rotary joint is composed of an upper rotating part and a lower rotating part, and is a joint that can communicate a liquid such as hydraulic oil even when both of them rotate mutually. 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 piping is twisted. Therefore, a method in which the upper rotating unit is fixed to the upper revolving unit and the lower rotating unit is fixed to the lower traveling unit has been conventionally adopted.

Hereinafter, a conventional structure for preventing rotation of a rotary joint will be described with reference to the drawings. FIG. 3 is a diagram 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 rotary joint having a conventional structure, and FIGS. 5A to 5C are views showing a conventional rotation preventing structure. In FIG. 3, crawlers 52 are provided on both sides of the lower traveling body 51. The crawler 52 is driven and driven by a hydraulic motor (not shown). An upper revolving unit 54 is rotatably mounted on a fixed table 53 of the lower traveling unit 51 via a bearing 55. The upper swing body 54 is swung by a swing motor (not shown).

A rotary joint 56 is arranged between the upper revolving unit 54 and the lower traveling unit. As shown in FIG. 4, the rotary joint 56 includes an upper rotating portion 56a and a lower rotating portion 56b, and is provided with a plurality of vertically communicating oil passages (not shown). Also,
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 part 56b is fixed to a bracket 61 fixed to the fixed table 53. The upper rotation part 56a is a rotation prevention structure 6 shown in FIG.
2 prevents mutual rotation with the upper swing body 54.

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 bolts 66 so that the inner surface is in contact with the side circumferential portion of the upper rotating portion 56a. A bar-shaped member 67 is fixed to the outer convex portion of the bracket 65 by welding or the like. The rod-shaped member 67 has an opening 68a 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 rotating body 54. With the above configuration, the pipes 57, 5 connected to the rotary joint 56
8 does not cause twisting.

[0006]

In the above-mentioned conventional structure, the bracket fixed to the rotary joint is inserted into the frame of the upper revolving unit. And remove
And it was necessary to fix it again. For this reason, there has been a problem that maintenance work of the rotary joint is complicated and troublesome. SUMMARY OF THE INVENTION The present invention has been made in view of the above background, and has as its object to provide a rotary joint rotation preventing structure that has a simple structure and is easy to maintain.

[0007]

The present invention employs the following means to solve the above-mentioned problems. That is, claim 1
The invention described above is directed to a construction machine in which a rotary joint is provided between a lower traveling structure and an upper revolving structure to prevent torsion of a pipe, wherein one of an upper rotating portion and a lower rotating portion of the rotary joint is a lower traveling structure. Or, a bracket is fixed to the upper revolving structure, and a bracket is fixed to the other, and is locked with the bracket to prevent free rotation, and a cutout hole through which the rotary joint can freely penetrate in the axial direction is formed in the lower traveling structure or the upper revolving structure. Is provided on the other side.

According to a second aspect of the present invention, in the first aspect of the invention, the bracket fixes the angle-shaped member with bolts such that an inner side of the bracket is in contact with an outer peripheral surface of the upper rotating portion. A notch hole is provided in the frame of the upper revolving structure, and a part of the notch hole is engaged with the outer convex portion of the angle member to synchronize the rotation of the upper rotating portion and the rotation of the upper revolving structure. Features.

According to a third aspect of the present invention, in the invention according to any one of the first to second aspects, a shim is inserted into a contact surface between the fixing portion of the bracket and the upper rotating portion, and the cutting is performed. It is characterized in that the locking of the notch can be adjusted.

[0010]

1 and 2 show an embodiment of the present invention. Hereinafter, embodiments of the present invention will be described with reference to the drawings. The same components as those of the conventional device are denoted by the same reference numerals, and the detailed description will be omitted. FIG. 1A shows a plan view, and FIG. 1B shows a side view. In FIG. 1, the lower rotating part (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 56a with bolts 12. A notch hole 14 is provided in the frame 13 of the upper swing body 54. Part of the edge 15 of the notch 14 is the bracket 11
The bracket 12 is provided so as to be non-rotatable when the upper rotating portion 56a rotates and the bracket 12 collides with the outer rotating portion 56a. However, the partial edge 15 is formed so that it can freely move in the direction of the rotation axis (vertical direction) while the bracket 11 is fixed to the upper rotating portion 56a.

A space 17 for adjusting work for tightening and loosening the bolt 12 is provided on both sides of a part edge 15 of the cutout hole 14. As shown in FIG. 2A, the gap between the outer convex portion 16 of the bracket 11 and the partial edge 15 can be freely adjusted by sandwiching the shim 21. Also, the shim 21 can be inserted with the bracket 11 attached as shown in FIG.
2 are provided.

According to the present embodiment, the rotary joint 56 can be removed and attached while the bracket 11 is fixed to the upper rotating portion 56a by the above-described structure, so that the repair and replacement of the rotary joint 56 can be easily performed. Is obtained. In addition, since the space 17 is provided, the operation of attaching and detaching the shim is easy, so that the effect of sufficiently preventing rotation can be obtained.

Instead of providing the partial edge 15 on the frame, a steel piece having a similar function may be fixed to the frame by welding or the like. Further, the bracket 11 is not limited to the angle, and may adopt another shape.

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 changes in design and the like may be made without departing from the gist of the present invention. Even if there is, it is included in the present invention. For example, although the embodiment using the bolt as the fixing means of the bracket is described, the present invention is not limited to this, and the fixing may be performed by other means. Although the lower rotating part is fixed, the upper rotating part may be fixed.

[0015]

As described above, according to the structure of the present invention, since the bracket can be removed and attached while the bracket is fixed to the rotary joint, repair and replacement of the rotary joint can be easily performed. The effect is obtained. In addition, an effect that the function of preventing rotation can be sufficiently exhibited by inserting the shim can be obtained.

[Brief description of the drawings]

FIG. 1 shows the entire configuration of the present embodiment. (A) is a plan view, and (B) is a side view.

FIG. 2 shows a gap adjusting unit of the embodiment.

FIG. 3 shows a lower traveling body and an upper rotating body of a conventional construction machine using a rotary joint.

FIG. 4 shows an entire conventional rotation preventing structure.

5 (A) to 5 (C) 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 rotating part 56b Lower rotating part

Claims (3)

[Claims] 1. A construction machine in which a rotary joint is provided between a lower traveling structure and an upper revolving structure to prevent torsion of piping, one of an upper rotating portion and a lower rotating portion of the rotary joint is connected to a lower traveling structure. Alternatively, a bracket is fixed to the upper revolving superstructure, and a bracket is fixed to the other, and is locked with the bracket to prevent free rotation, and the rotary joint is provided with a cutout hole which can penetrate in the axial direction. A structure for preventing rotation of a rotary joint, which is provided on the other side. 2. The bracket has an angle-shaped member fixed with bolts such that an inner side thereof comes into contact with an outer peripheral surface of the upper rotating portion, and the notch hole is provided in a frame of the upper revolving body. 2. The structure for preventing rotation of a rotary joint according to claim 1, wherein a part of the hole is engaged with an outer convex part of the angle member to synchronize the rotation of the upper rotating part and the rotation of the upper rotating body. . 3. The locking of the notch hole can be adjusted by inserting a shim into a contact surface between the fixing portion of the bracket and the upper rotating portion.
The structure for preventing rotation of a rotary joint according to any one of the above.