KR100244097B1 - Asymmetry substructures of a construction mechanics - Google Patents

Abstract

The present invention relates to a construction machine consisting of a lower portion and an upper structure and coupled so that the upper portion can be pivoted relative to the lower portion, as the lower portion is characterized in that it is asymmetrical and symmetrical with respect to the pivot center of the upper portion. The maximum digging force and maximum lifting load can be increased without increasing the total weight or increasing the overall weight, resulting in a more robust and stable working capacity.

Description

Lower asymmetric construction machinery

1 is a schematic diagram showing a conventional construction machine structure.

2 and 3 are schematic diagrams showing the state of the construction machine of FIG. 1 during forward and back digging, respectively.

4 and 5 are schematic diagrams showing the state of the construction machine of FIG. 1 at the time of forward lifting and rear lifting, respectively.

6A, 6B, 7A, and 7B are schematic diagrams for explaining the geometrical definition of construction machinery according to the present invention, respectively.

8 is a schematic diagram of a construction machine for explaining the effects of the present invention.

* Explanation of symbols for main parts of the drawings

1: lower running body 2: upper turning body

3; Bucket 4: Arm

5: pour

The present invention relates to a construction machine consisting of a lower portion and an upper structure and coupled so that the upper portion can pivot about the lower portion.

Excavator, one of the above types of construction machinery, as shown in Figure 1, consists of a lower running body 1 and the upper swing body 2, the upper swing structure 2 is a lower running body (1) It is coupled so as to make a relative swing movement with respect to), and as a work device for performing various operations on the upper swing body 2, a bucket 3, an arm 4 and a buoy 5 are installed.

On the other hand, if the work of the excavator is largely divided into two, the excavation work and the lifting operation can be mentioned. The excavation operation is a digging operation by touching the bucket 3 to the ground as shown in FIGS. 2 and 3, and the lifting operation is a bucket 3 as shown in FIGS. 4 and 5. This is to lift the soil contained in).

Since the excavator can pivot about the lower traveling body 1 as described above, the excavation can be carried out in the forward digging as shown in FIG. 2 and the back digging as shown in FIG. (Excavation with the upper pivot pivoted 180 degrees with respect to the lower pivot). In the case of forward digging, L2, the shortest distance from the pivot center point 0 to the rear end of the lower travel body, determines the maximum digging load, and in the case of back excavation, from the pivot center point 0 to the rear end of the lower travel body. The shortest distance of L1 is the factor that determines the maximum digging load.

On the other hand, during the lifting operation, both the front lifting as shown in FIG. 4 and the rear lifting as shown in FIG. 5 are possible, L1 for forward lifting and L2 for rear lifting respectively determine the maximum lifting load. Since it becomes an element, it is completely opposite to the case of the above-mentioned excavation work. This is because the direction of the force acting on the lower traveling body in the excavation work and the lifting work is opposite. In consideration of these conflicting conditions, L1 = L2 is determined to equalize the front maximum digging load and the rear maximum digging load and the front maximum lifting load and the rear maximum lifting load in the conventional construction machine. That is, in the conventional construction machine, the lower traveling body is designed to be symmetric in the front-rear direction with respect to the turning center point of the upper swinging body.

Therefore, in view of the design conditions of the conventional construction machine, in order to increase the maximum digging load and the maximum lifting load, there was no way except to extend the total length of the undercarriage or increase the total weight, so that the cost aspect, design It was extremely restrictive in many respects, including the enemy. In the actual construction site where the maximum digging load and the maximum lifting load are often neglected, there is a concern that serious accidents may occur due to forward and rearward conduction of the construction machine.

SUMMARY OF THE INVENTION An object of the present invention is to provide a construction machine capable of securing a more powerful and stable work capacity by increasing the maximum digging load and the maximum lifting load without extending the total length of the undercarriage or increasing the total weight. It is in doing it.

The above object is a construction machine having a lower traveling body and an upper swinging body coupled to be pivotable with respect to the lower traveling body, wherein the lower traveling body is asymmetrical and symmetrical with respect to the pivot center of the upper swinging body. It is achieved by providing a construction machine characterized in that.

The features of the construction machine of the present invention as described above, specifically can be defined as satisfying the following relationship.

Where L1 is the shortest distance from the pivot center point to the lower running body front end, L2 is the shortest distance from the pivot center point to the lower travel body rear end, L3 is the shortest distance from the pivot center point to the lateral end, L4 Is the distance from the undercarriage front end to the rear end.

The construction machine having the above characteristics is the maximum digging load by changing only the geometric design conditions because the lower running body is asymmetrical with respect to the turning center point of the upper turning body while the total length L4 and the total weight of the lower running body remain the same. And maximum lifting load can be increased. Therefore, more stable work is possible in the work requiring the same digging force and lifting force, and the total weight can be lighter while having the same maximum digging force and the maximum lifting load.

Hereinafter, the present invention will be described in more detail with reference to the accompanying drawings.

The construction machine according to the present invention is characterized in that the lower traveling body is asymmetrical and symmetrical with respect to the pivot center of the upper swinging body.

6 and 7 schematically show the construction machine of the present invention, wherein 1,2,3,4 and 5 are the same as in FIGS. 1 to 5, respectively, lower running body and upper turning. Sieves, buckets, arms and booleans.

The construction machine of the present invention, as shown in Figures 6a, 6b and 7a and 7b, on the basis of the pivot center (0), the front end of the lower traveling body (1) from the pivot center (0) The shortest distance to (A) is L1, the shortest distance from the pivot center point (0) to the rear end body (B) rear end B is called L2, and the shortest distance from the pivot center point (0) to the lateral end part. If L3, the sum of L1 and L2 is equal to L4, which is the distance from the front end portion A to the rear end portion B of the lower traveling body 1, and L1 is not equal to L2. As a result, L1 <L2 (in case of FIG. 6: the pivot center of the upper swing body is shifted forward from the front and rear center of the lower vehicle), or L1> L2 (in case of FIG. 7: the pivot center of the upper swing body is lower Rearward from the fore and aft center of the traveling body).

On the other hand, in the construction machine of the present invention, in order to prevent side conduction, L1 and L2 cannot be designed smaller than L3. That is, L3 is the minimum safety length of L1 and L2 determined to prevent side conduction.

Features of the present invention as described above can be defined by the following two relations.

Hereinafter, the effect of this invention which has the above characteristics based on FIG. 8 is demonstrated.

In FIG. 8, L1, L2, L3 and L4 and O, A and B, etc. are the same as defined in FIGS.

L5 is the shortest distance from the front end (A) of the lower running body (1) to the end of the bucket (3) where the force acts, G is the total weight of the construction machine, the lower running body (1), the upper turning body (2) ), The sum of the weights of the bucket (3), arm (4) and pour (5). X is the shortest distance from the center of gravity of the whole construction machine to the center of revolution (0). Herein, the X value is expressed as a left side effect in the positive direction with respect to the turning center point (0).

When L1 and L2 are the same, that is, in the conventional construction machine, the two points where the excavation load acts are B and C, and the maximum excavation load (W1) is the moment of the moment when the machine is stopped based on the point B. Since it can be expressed in total, the maximum digging load W1 is calculated by the following equation.

Here, if G, the gross weight of the machine, is constant and L3 is also constant, the value of W1 is proportional to the increase of L2. Under the condition of the lower asymmetry like the present invention, since L1 + L2 = L4 (Equation 1) and L2> L1> = L3 (Equation 2),

Becomes Therefore, the value of L2 for the maximum value of W1 is, under the condition of Equation 2,

Becomes

Therefore, the maximum value (W1 _MAX ) of the maximum digging load is

Where W1 _MAX > W1,

Therefore, the maximum excavation load of ΔW1 may be afforded by the effect of front and rear asymmetry (L2> L1) of the lower traveling body.

On the other hand, the maximum lifting load W2 can also be obtained by similar logic as described above. The only difference is that the direction of force is reversed and the point of action is A and C. In other words,

L1 = L4 -L2 and L1> L2> = L3 under the condition of lower asymmetry,

That is, the maximum lifting load (W2 _MAX ) is

Where W2 _MAX > W2,

Therefore, the maximum lifting load of ΔW2 may be afforded by the effect of the front and rear asymmetry (L1> L2) of the lower traveling body.

As described above, according to the present invention, since the lower traveling body is asymmetrical with respect to the pivot center of the upper swinging body while the total length and the total weight of the lower running body remain the same, the maximum excavation load and the maximum only by changing the geometric design conditions. The lifting load can be increased. Therefore, the maximum digging load and the maximum lifting load can be made larger while having the same total weight, and the total weight can be lighter.

Claims (2)

A construction machine having a lower running body and an upper swinging body coupled to be pivotable about the lower running body, wherein the lower running body is asymmetrical and symmetrical with respect to the pivot center of the upper swinging body. Construction machinery. The construction machine according to claim 1, wherein the construction machine satisfies the following equation. (Wherein L1 is the shortest distance from the pivot center point to the lower travel body front end, L2 is the shortest distance from the pivot center point to the lower travel body rear end, L3 is the shortest distance from the pivot center point to the lateral end, L4S is the distance from the undercarriage front end to the rear end).