JP2000204586A - Linkage section grease supply structure for operating tool of construction machinery - Google Patents

Abstract

PROBLEM TO BE SOLVED: To permit to prevent damages to grease piping and permit remote central grease supply to the bearing section of power link by simple operation. SOLUTION: For the bottom surface of a coupling portion 10 of a power link 1, a plate 15 covering the gap between bars 13, 14 respectively coupling to bearing portions 12, 11 of journal portions A, B at idler link side and bucket side is adhered to he bottom surface of bars 13, 14; for the top surface, a plate 16 covering the gap between the bars 13, 14 is fastened to the top surface of the bars 13, 14 with a bolt 19 in a detachable manner, and the coupling portion 10 is formed to a box-shaped cross section. A notch is made in an upper plate 16, a pipe body 5 is inserted inside of the coupling portion 10 from a gap 18 formed between a cylinder rod 3 and a bearing portion 30 and is connected to a distribution valve 6 placed on a bottom plate 15. Grease supplied from the pipe body 5 is injected to each of bearing portions 11, 12, 30 through the distribution valve 6 and a branch pipe 50.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a grease lubrication structure in a working tool linkage of a construction machine.

[0002]

2. Description of the Related Art As shown in FIG. 2, a construction machine such as a hydraulic shovel comprises a lower traveling unit 7, an upper revolving unit 8, and a working unit 9 for excavating and loading earth and sand. The unit 9 includes a working tool such as a bucket 4 at the tip, a boom 20, an arm 21, a hydraulic cylinder 22, and the like for freely operating the working tool.

[0003] The work implement 9 such as the bucket 4 is operatively connected to the tip of an arm 21 by a hydraulic cylinder 22 in order to directly dig in soil and the like. This connecting part is called a linkage part. This linkage part will be described in more detail with reference to FIG. 3 in which the bucket 4 is attached as a working tool. At the same time, connect the tip of the arm 21 with the bracket 4
The power link 1 is laterally connected to the other side of the bracket 40 and the tip of the cylinder rod 3, and the ends of the power link 1 are axially mounted via pins 23. By this connection, power link 1, idler link 2, arm
21. A link mechanism is formed with each connecting portion of the bucket bracket 40 (in the figure, a pin 23 shaft attachment portion) as a node, and a hydraulic cylinder is formed.
By the extension and contraction operation of 22, the rotation operation of the bucket 4 around the shaft attachment portion at the tip of the arm 21 is enabled.

[0004] As shown in FIG. 4, the power link 1 has bearing portions 11 and 12 for receiving the pins 23,
A connecting portion 10 for connecting the bearing portions 11 and 12 at both ends is provided.In the related art, the bearing portions 11 and 12 are provided with an inlet 17 for grease lubrication, and a grease nipple 24 is attached thereto. Was. Therefore, in the power link 10 having such a structure, the grease gun 25 is directly connected to the grease nipple 24.
And grease lubrication was performed.

[0005] However, in this case, it is troublesome to bring the grease gun 25 to the bearing portions 11 and 12 one by one, and it is extremely complicated when performing the greasing work in other places. Therefore, recently, as shown in FIGS. 3 and 5,
A greasing pipe 5 (piping such as a thin steel pipe or a vinyl pipe) is arranged along the outer surfaces of the idler link 2 and the power link 1 and the pipe 5 is filled with the grease inlets of the bearing portions 11 and 12.
17 and a method of performing greasing from a construction machine body side to a plurality of greasing locations including other greasing locations (hereinafter, simply referred to as a remote greasing method).

[0006]

In such a recent structure, since the tube 5 is exposed on the surface of each member, the tube 5 may interfere with the outside during operation of the working tool and be damaged. Particularly, there is a high possibility that the pipe body 5 is arranged along the idler link 2 exposed on the distal end side.

However, the tube 5 on the idler link 2 side
With regard to, the pipes arranged on the power link 1 that are not likely to be damaged due to the operator's careful operation so that the work implement does not come into contact with the outside, and rather have no risk of contact with the outside 5 had been damaged. This is because soil and the like spilled from the working tool such as the bucket 4 enter the gap X formed by the power link 1, the bucket bracket 40, the tip of the arm 21, and the idler link 2 as shown in FIG. The gap X fluctuates in a series of operations, and soil and the like during that time are pressed,
The pressing damages the tube 5 on the surface of the power link 1.

On the other hand, as shown in FIG. 5, although it is conceivable to protect the tube body 5 by using a cover 26 made of a channel material or the like, such a structure increases the weight and cost, and the space is limited. It was difficult because of the restrictions.

Therefore, even in a construction machine having a structure in which remote centralized greasing is employed, only the bearing portion of the power link has a structure in which an operator manually grates with a grease gun as shown in FIG. This was the actual situation, and the greasing work was twice as troublesome, and the complication was not eliminated at all.

[0010] The present invention has been made in view of the above problems of the prior art, and solves the problem of damage to the greasing tube.
An object of the present invention is to provide a technique capable of performing a remote lubrication method with a simple operation without any problem.

[0011]

As a result, the inventor of the present invention has studied various structures for solving the above-mentioned problems. As a result, the connecting portion of the power link has a housing-shaped cross section, and the inside of the connecting portion is used. In the case where the greasing tube extending from the construction machine body is inserted, the tube is not exposed on the power link surface, the tube is not lost, and the remote concentrated greasing method is used. It was found that the method could also be applied to the power link and the bearings in the vicinity of the power link. I faced the problem of getting tougher.

That is, if a pipe is connected to each bearing in the power link connection portion, at least the number of bearings (for example, in FIG.
Including four places, only four places) are required. The thickness of the connecting portion of the power link is 30 to 40 mm, while the diameter of the vinyl tube or the metal tube as the tube is about 10 mm, and the tube inside the connecting portion is in a rather obscene state.
In particular, since the protection of the pipe body is provided for protection, the thickness of the pipe body is increased, and the condition is further deteriorated. Further, when the link members are tilted relative to each other, the pipe body to be inserted needs a margin to absorb the angle, but it is also difficult to secure a space with such a margin.

[0013] For this reason, the present inventor has a configuration that solves such a problem by disposing a distribution valve inside the connection portion of the bearing and connecting the greasing tube to the distribution valve.
The invention has been devised to provide a configuration in which lubrication is supplied to each bearing portion via a distribution valve.

According to such a configuration, not only is the pipe inside the connecting portion arranged, but also an arbitrary amount of grease can be stably supplied to each bearing portion, and the working tool linkage portion has A remarkable effect of improving the operation is also recognized.

[0015]

FIG. 1 shows an example in which the present invention is applied to a hydraulic shovel, and particularly shows a bucket linkage. In the figure, 1 is a power link, 2 is an idler link, 3
Is a cylinder rod, 4 is a bucket, 10 is a power link connecting portion, 11, 12, and 30 are bearing portions of each member, 40 is a bucket bracket, A is an idler link side shaft support portion,
B indicates each of the bucket-side journals. Also, in the bearing portions 11 and 12 of the power link 1 of the present embodiment, it is premised that the remote lubrication method is adopted, and for this reason, the tube 5 extending from the arm side is arranged.

The connecting portion 10 of the power link 1 has a side surface formed by two bars 13 and 14 for connecting each bearing portion 12 of the idler link side shaft supporting portion A and the bearing portion 11 of the bucket side shaft supporting portion B, respectively. It is formed. Also, the connecting part 10
The bottom surface is formed by attaching a plate 15 covering the gap between the two bars 13 and 14 to the bottom surfaces of both bars 13 and 14. On the other hand, a plate 16 covering the gap between the two bars 13 and 14
It is detachably fastened to the upper surfaces of the bolts 3 and 14 by bolts 19. Therefore, the connecting portion 10 is formed in a box-shaped cross section by the bars 13 and 14, the attached bottom plate 15, and the fastened upper plate 16. A cutout is formed at the center of the upper plate 16 on the idler link side, and the cutout allows a predetermined gap between the upper plate 16 and the bearing portion 30 of the cylinder rod 3 when the upper plate 16 is fastened. The tube 5 is inserted into the connecting portion 10 from the gap 18. Also, on the bottom plate 15 between the two bars 13 and 14,
The distribution valve 6 is placed, and the inserted pipe 5 is connected to the distribution valve 6. From the distribution valve 6, each bearing part 11, 12, 3
A branch 50 towards 0 extends.

On the other hand, in each of the bearing portions 11, 12, and 30, an injection port 17 communicating from the inner wall surface to the inside of the connecting portion 10 is formed in an outer wall surface facing the distribution valve 6 side. Branches 50 are connected to their inlets 17.

Therefore, the grease from the tube 5 first flows into the distribution valve 6 in the power link connection portion 10, and from there, through each branch pipe 50, from each injection port 17 to each bearing portion 11, 1.
Injected into 2,30.

As described above, in the present embodiment, the connecting portion 10 of the power link has a cross section of a box shape, and the tube 5 is inserted into the inside thereof. It is not necessary to extend to the side of the branch B.
And the power link that occurred in the conventional structure shown in FIG.
1. The problem that the pipe body 5 is damaged by soil or the like entering the gap X formed by the bucket bracket 40, the arm tip, and the idler link 2 has been solved. Moreover,
In the present embodiment, the grease is supplied to four places. Since the grease supplied to these parts flows from the distribution valve 6, respectively, the grease flow passage 5 and the branch pipe 50 are provided.
Not only can be easily and orderly arranged, but also an arbitrary amount of grease can be stably supplied to each of the bearing portions 11, 12, and 30, and the operation of the working tool linkage portion becomes extremely good. Further, the upper plate 16 of the power link connecting portion 10 is detachable by bolts 19, and the distribution valve 6 and the pipe member
The maintainability of 5,50 is also good.

[0020]

As described above, according to the power link according to the present invention, the problem of tube damage can be solved, and a remote lubrication method that can be easily operated even at the bearing portion of the power link. It can be implemented without any problems.

[0021] For this reason, since the centralized lubrication operation can be performed at once including the other grease supply units, the grease lubrication operation can be streamlined as compared with the conventional case.

Further, by distributing the distribution valve, not only can the pipe inside the connecting portion be easily and orderly arranged, but also it is possible to stably supply an arbitrary amount of grease to each bearing portion. The operation of the working tool linkage becomes extremely good.

[Brief description of the drawings]

FIGS. 1A and 1B show a specific embodiment according to the present invention, wherein FIG. 1A is a plan view, and FIG.

FIG. 2 is a plan view showing a general structure of a construction machine (hydraulic shovel).

FIGS. 3A and 3B are side views showing a connecting portion at a tip end of a working unit of the construction machine, wherein FIG. 3A is a diagram illustrating a state in which a gap X between the connecting portions is wide, and FIG. FIG.

4 (a) is a perspective view, FIG. 4 (b) is a side sectional view, and FIG. 4 (c) is a rear view (partial cross section) of a state in which a pin is inserted through the shaft.

FIGS. 5A and 5B show a structure of a power link that has been used recently. FIG. 5A is a perspective view, and FIG. 5B is a side sectional view.

[Explanation of symbols]

 1 Power link 2 Idler link 3 Cylinder rod 4 Bucket 5 Pipe 6 Distribution valve 10 Connecting part 11,12 Bearing part 13,14 Bar

Claims (1)

[Claims] 1. A connecting portion of a power link having a box-shaped cross section, a greasing tube extending from a construction machine body is inserted into the connecting portion, and a distribution valve is disposed. A greasing structure for a working tool linkage of a construction machine, wherein the greasing pipe is connected to the distribution valve, and the bearings are lubricated via the distribution valve.