JP2581899B2 - Work machine greasing equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lubricating apparatus for a pin connecting portion which is rotatably connected by a pin in a working machine of a truck or wheel type construction machine such as a hydraulic shovel or a loader. .

[0002]

2. Description of the Related Art As shown in FIG. 4, in a hydraulic shovel, respective parts are rotatably connected by a pin connecting part 4 by a front working machine comprising a boom 1, an arm 2 and a bucket 3, and this front working is performed. Hydraulic cylinders such as a boom cylinder 5, an arm cylinder 6, and a bucket cylinder 7 for operating each part of the machine and a bucket linkage 8 are rotatably connected by a pin connecting portion 9. Grease is lubricated into the bearings of the pin connection portion 4 and the pin connection portion 9, respectively.

For example, when supplying grease to a dangerous place at a high place or a place hard to reach, such as a pin connection part of an arm cylinder 6 or a bucket linkage 8, the arm 2
Grease nipple 11 in a safe and accessible location such as the side of
Is installed, the grease pump 12 connected to the grease nipple 11 is operated, the grease nipple 11 passes through a greasing pipe such as a straight pipe 13 and a flexible hose 14, and the internal grease reservoir of the bearing portion at the required pin connection portion 9 The part is greased.

[0004] One end of the flexible hose 14 is connected to the straight pipe 13 by a pipe joint 15 attached to the arm 2, and the other end of the flexible hose 14 is screwed into a bearing at the rod end of the arm cylinder 6. Connected to the pipe joint 16.

[0005]

In the case of such a conventional greasing pipe structure, as shown in FIG.
When the operation changes from the bent state (A) to the extended state (B) of the arm 2, an extra convex state occurs in the flexible hose 14, and this convex part 14 a is formed, for example, by a tree branch or a narrow part. The flexible hose 14 may be damaged by hitting or hooking on an upper obstacle at a place (closed place).
In such a case, the greasing becomes impossible, and the construction machine must be stopped and repaired.

The present invention has been made in view of the above points, and uses a flexible tube permanently deformed by bending as a greasing tube, and the greasing easily occurs in conjunction with the rotation of the working machine. An object of the present invention is to eliminate slack from a working machine surface of a pipe and to prevent a suspension due to breakage of a greasing pipe.

[0007]

According to the present invention, there is provided a greasing apparatus in which grease is supplied through a greasing pipe to a pin connecting portion rotatably connected by a pin in a working machine of a construction machine. A greasing device for a working machine having a configuration in which a flexible tube, which is permanently deformed in a meandering shape by bending , is disposed in a flat shape along a working machine surface as a greasing tube connected to a pin joint.

[0008]

[0009]

According to the present invention, a meander disposed flat along the work machine surface even when the length or angle between both ends of the flexible tube changes.
The flexible tube expands and contracts along the surface of the work machine , and
Absorbs changes in length or angle and does not protrude from the work equipment surface.

[0010]

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the embodiments shown in FIGS. The same parts as those in the conventional example shown in FIGS. 4 and 5 are denoted by the same reference numerals, and description thereof will be omitted.

As shown in FIG. 1B, an arm 2 is attached to the tip of a boom 1 in a front working machine of a hydraulic shovel.
Are rotatably connected by a pin connecting portion 4a, and
A rod end of an arm cylinder 6 is rotatably connected to a base end of the arm 2 by a pin connecting portion 9a.

As shown in FIG. 1A, at the pin connecting portion 9a, between a pair of brackets 21 welded to the base end of the arm 2, a cylindrical shape welded to the rod end of the arm cylinder 6 is provided. The bearing portion 22 is fitted and rotatably connected by a pin 23, and a grease injection pipe joint portion 16 is screwed into the bearing portion 22.

A grease nipple 11 (FIG. 4) provided on the side surface of the arm 2 connects a greasing pipe composed of a straight pipe 13 and a flexible pipe 24 connected to the straight pipe 13 via a pipe joint 15. Through the pipe joint 16 and the bearing
Grease is supplied to the grease reservoir on the inner peripheral surface of 22.

The flexible tube 24 connected to the pin connecting portion 9a is made of a resin-based flexible hose (commonly called nylon hose) which is permanently deformed in a meandering shape by heat.
Alternatively, a flexible metal tube such as a copper tube, which is bent in a meandering shape as shown in FIG. 1A and permanently deformed, is used, and this flexible tube 24 is shown in FIG. 1B. It is arranged flat along the arm surface of the working machine so that

The meandering flexible tube 24 expands and contracts so that the spring expands and contracts even if the distance and angle between the bases 25 and 26 at both ends change within a certain range. It is possible to absorb.

The flexible tube 24 may be bent into a cylindrical coil shape. However, as shown in FIGS. 1A and 2A, a flat (flat) meandering shape (flat shape) is used. Forming in a zigzag shape is superior in reducing the amount of protrusion from the arm surface.

Next, the operation of the embodiment shown in FIGS. 1 and 2 will be described.

As shown in FIG. 1B, when the arm 2 is bent with respect to the boom 1, the pipe joint 15 on the arm side is separated from the pipe joint 16 on the rod side.
As shown in FIG. 1A, a meandering flexible tube 24 has a shape in which a spring is relatively elongated.

On the other hand, as shown in FIG. 2B, when the arm 2 is extended with respect to the boom 1, the pipe joint 15 on the arm side approaches the pipe joint 16 on the rod side. Therefore, as shown in FIG. 2A, the meandering flexible tube 24 is in a state where the spring is relatively compressed.

The flexible tube 24 formed in a meandering plane by bending as described above expands and contracts along the surface of the working machine even if the length between the bases 25 and 26 at both ends changes. Thus, the change can be absorbed.

Next, an example in which the greasing device according to the present invention is applied to a bucket connecting portion will be described with reference to FIG.

The bucket 3 is rotatably supported at the lower end of the arm 2 via a pin connecting part (not shown in FIG. 3), and the bucket linkage 8 is connected to the tip of a rod 7a of the bucket cylinder 7 via a pin connecting part 9b. And the upper ends of a pair of levers 27 pivotally supported on the side surfaces of the arm 2 are rotatably connected. The lower end of the bucket linkage 8 is rotatably connected to the back surface of the bucket 3 via a pin connecting portion 9c.

The pin connecting portion 9b is provided in the bucket cylinder 7
A pin 34 is inserted into a bearing portion 31 welded to the tip of the rod 7a, a pair of bearing portions 32 welded to the upper end portion of the bucket linkage 8, and a bearing portion 33 welded to the upper end portion of the lever 27. Thus, it is possible to freely rotate between the bearing portions. Similarly, the pin connecting portion 9c is rotatable by inserting a pin 38 into a bearing portion 35 welded to a lower end portion of the bucket linkage 8 and a bearing portion 37 welded to a rear bracket 36 of the bucket 3. It is what it was.

A flexible tube 41, which is permanently deformed in a meandering shape by bending, is provided along the back surface of the bucket linkage 8. The base 42 at one end of the meandering flexible tube 41 is
The tip end bearing part 31 of the rod 7 a of the bucket cylinder 7 is connected via a pipe joint part 43, and a base part 44 at the other end of the flexible tube 41.
The bearing 35 welded to the lower end of the bucket linkage 8
Are connected via a pipe joint 45.

A grease supply pipe 46 for supplying grease is also connected to the pipe joint 45, and grease supplied from the grease supply pipe 46 is supplied to the inside of the lower bearing 35 and the upper bearing 31. The grease reservoir is filled.

When the rod 7a of the bucket cylinder 7 expands and contracts, the angle between the rod 7a and the bucket linkage 8 changes, so that the meandering flexible tube 41 also expands and contracts and its bases 42 and 44. Absorb changes in length or angle between them.

For example, when the rod 7a of the bucket cylinder 7 contracts, as shown in FIG. 3, the rod 7a and the bucket linkage 8 open at almost 180 degrees, so that the meandering flexible tube 41 is opened.
When the rod 7a of the bucket cylinder 7 extends, the bucket linkage 8 moves in the closing direction with respect to the rod 7a as shown in FIG.
Shrinks to absorb the change in length or angle between the bases 42, 44.

As described above, even if the length or angle between both ends of the flexible tubes 24 and 41 changes, the flexible tube which is permanently deformed in a meandering shape by bending and disposed along the surface of the working machine. 24,41
Since the above-mentioned change is absorbed by expanding and contracting along the work machine surface, there is no possibility that the flexible tubes 24 and 41 protrude from the work machine surface.

The flexible tube according to the first aspect includes a flexible tube bent into a cylindrical coil shape.

[0031]

According to the present invention, a meandering shape is formed by bending.
Since the flexible tube that has been permanently deformed is arranged flat along the working machine surface, even if the length or angle between both ends of the flexible tube changes, the change is caused by expansion and contraction of the flexible tube, etc. and Ru can be absorbed
In both cases, the flexible tube expands and contracts along the work machine surface,
Projection from the machine surface can be completely prevented , and breakage of the flexible tube due to slackness from the work machine surface can be prevented, so that the construction machine can be stopped.

[0032]

[Brief description of the drawings]

FIG. 1 shows an embodiment of a greasing device in a state in which an arm of a working machine according to the present invention is bent, (A) is a front view thereof, and (B) is a side view thereof.

FIG. 2 shows an embodiment of a greasing device in a state where an arm of the working machine is extended, wherein (A) is a plan view thereof, and (B).
Is a side view thereof.

FIG. 3 is a perspective view showing a greasing device provided in a bucket connecting portion of the working machine from the inside.

FIG. 4 is a front view showing a grease lubrication method in the hydraulic excavator.

5A and 5B show a conventional greasing device for a pin connection portion of a rod tip of a working machine arm cylinder, wherein FIG. 5A is a side view showing a state in which the arm is bent, and FIG. FIG.

[Explanation of symbols]

 9a Pin joint 13 Greasing tube 24, 41 Flexible tube

Claims (1)

(57) [Claims] 1. A greasing device in which grease is supplied through a greasing pipe to a pin connecting portion rotatably connected by a pin in a working machine of a construction machine, wherein a grease connected to the pin connecting portion is provided. A flexible tube that has been permanently deformed into a meandering shape by bending as an oil tube
A greasing device for a working machine, which is disposed in a flat shape .