KR20020001316A - front idler - Google Patents

Abstract

PURPOSE: A front idler is provided to allow for a mass production of front idlers by improving the structure of front idler, while reducing resonance noise caused by the friction with the track. CONSTITUTION: A front idler(50) has a circumferential rim(51) contacting a track, wherein the circumferential rim is constituted by two or more unit members divided into an equal size and coupled through a welding process. A vibration absorber(54) made up of a light weight material fills the space which is formed between the circumferential rim and a boss(55) and sealed by a flange(53). The flange has an injection port formed at a surface of the flange so as to inject the vibration absorbing material into the front idler, and a sealing member(56) for closing the injection port after completion of the injection.

Description

Front idler of underdrive for driving heavy construction equipment

The present invention relates to a lower driving device for driving heavy construction equipment, more specifically, to improve the structure of the front idler (front idler) to be produced in a small casting factory without specialized equipment, due to friction with the track It is to provide a front idler that can greatly reduce resonance noise.

In general, heavy construction equipment is widely used as a high-productivity equipment as a labor force in civil construction works such as highways, ports, dams, and urban development.

As an example, the heavy construction equipment 10 proceeds by rotating a track 30 in which the sprocket 20 of the lower drive acts as a wheel when the engine, which is the main power source, starts, as shown in FIG. 1. It is configured to travel along a direction.

At this time, the front idler 40 which induces the traveling direction of the track 30 is tensioned in the horizontal direction of the equipment with respect to the sprocket 20 which is the driving shaft in order to improve contact with the ground when the track is moved forward and backward. It is to push and idle.

Therefore, the front idler 40 is easy to mount and has a certain mechanical stiffness, the material is required to reduce the wear when contacting the track 30, the hardness after heat treatment, and the like.

The front idler 40 is a relatively simplified machine product with no technical added value. The front idler 40 is produced with simple castings, forgings, and welds, and thus has a competitive price, and is mostly bulky and heavy. Hard work due to the nature of the facility.

In particular, the work site is very poor due to noise, vibration, dust, high temperature, harmful gases, etc., due to the forging work, the operator tends to avoid.

Conventionally, as shown in FIG. 2, a forged rim type front idler 40a having a configuration in which castings and forgings (circumferential rim 41, flange 42, boss rim 43) are joined by welding, respectively, and in FIG. As shown, a cast-integrated front idler 40b in which the circumference, the flange, the boss rim and the like are integrally formed is used.

However, the conventional front idler 40 has a disadvantage in that a casting and forging facility or a factory scale becomes large because of specificity such as size, weight, and rim.

In particular, in the case of the integral cast front idler 40b, the heat treatment hardness of the track contact portion and the depth of hardness must be deeply formed to increase the durability life, but the material weight is high and there are many constraints due to economic efficiency in high efficiency materials or production process. have.

Moreover, the specificity of the casting method is not precise, and thus the productivity is low, and the integrated cast front idler 40b forms a space therein to reduce the weight of the material, but during casting, a separate core or sand is filled in the space. There were many difficulties in removing the sand after casting.

In addition, the forged rim type front idler 40a has a disadvantage in that the manufacturing facilities of the rim (Wonju) are expensive, and the special facilities are reserved only by a few specialized companies.

In addition, the conventional front idler 40 forms a space inside thereof in order to reduce weight, which may cause resonance noise due to contact with the track 30.

In order to solve the above-mentioned problems, the present invention changes the molding structure of the front idler to make the operation more convenient, improving the working environment of the worker, and can be produced in a small casting factory without special specialized equipment. It aims to increase production by making it have a purpose.

In another aspect, the present invention provides a front idler that can minimize the vibration noise caused by friction with the track during the operation of the equipment to achieve low noise, and the weight of the product and the wide selection of materials can be greatly improved the endurance life. It is.

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

1 is an exemplary view of heavy equipment under construction.

2 and 3 are exemplary views of a front idler showing a conventional configuration,

4 is a half sectional view of a front idler showing the configuration of the present invention;

5 is an exemplary view showing a structure of a circumference applied to the present invention,

* Explanation of symbols on the main parts of the drawings *

10: heavy construction equipment

20: Sprocket

30: track

40: 40a, 40b, 50: front idler

51: Wonjurim

52: unit member

53: Hurenji

54: dustproof agent

55: boss

Figure 4 shows a half cross-sectional view of the front idler according to the present invention, Figure 5 is an exemplary view showing the configuration of the circumference to be in contact with the track.

In shaping the front idler of the lower driving device for driving heavy construction equipment which guides the traveling direction of the track 30, at least two circumferential rims 51 of the front idler 50 brought into contact with the track 30 are at least two. It is composed of unit members 52, 52, 52 that are equally divided into, and these unit members (52, 52, 52) are coupled through the canned welding.

And one side of the flange 53 is joined to one side of the circumference 51 is formed with a curved surface to have a curved slope, the inside of the front idler 50 in accordance with the present invention is a separate dustproof material made of a lightweight material 54 is filled.

An injection hole for injecting a filler is formed on one side of the flange 53, and the injection hole is provided with a sealing member 56 such as a prag bolt configured to intercept it.

According to the present invention configured as described above, the front is formed by a circumferential rim 51 having a structure in which a plurality of unit members 52, 52, and 52 formed by dividing are joined together, and a boss 55 and a flange 53 fitted inwardly thereof. It will construct an idler.

It is assembled as shown in Figure 5, a certain unit member 52 to form a circumferential rim, such that the unit member is integrally joined through the cannical welding to be fixed.

The boss 55 is installed on the inner side of the circumferential rim 51 to which the unit member 52 is bonded, and then the flange 53 is fixedly bonded to both sides of the boss 55 and the circumferential rim 51.

After filling the dustproof material 54 to the inside of the front idler 50 through the injection hole installed in the flange 53, and using the sealing member 56 to interrupt the injection hole after filling the dustproof material 54. To close the injection port.

As described above, the present invention is composed of a prefabricated structure in which a circumferential rim forming the outer circumferential surface of the front idler to be in contact with the track is combined with two or more unit members. If not, it can be produced easily through small forging facilities.

In addition, in the material selection, it is possible to reduce the dependence on the forging method by not using a conventional single material.

Therefore, it is possible to easily manage the dimensions as well as the endurance life fundamentally satisfactory result by the diversification of the material selection or heat treatment selection method.

According to the present invention, the flanges joined between the circumference and the boss can be prevented from accumulating dirt or dust on the side surface of the front idler by forming a curved surface of one end face pressed by a pressing member such as a press.

In addition, the inside of the flange joined between the circumference and the boss is not left in an empty space, and the inside of the flange is filled with a dustproof material made of a lightweight material, thereby preventing the occurrence of resonance noise.

As described above, according to the present invention, the circumferential rim of the front idler in contact with the track of the lower drive device of the heavy machinery is composed of unit members having a predetermined size, and these are formed by forming into the same shape as the existing circumferential rim through the pipe welding. As the dependence on large forging facilities such as this decreases, the working environment is greatly improved, and mass production is possible at a low price.

In addition, the inner space of the front idler is filled with a separate dustproof material to close the space there is no resonant noise generated during the operation of the equipment there is an effect such as significantly reduced noise.

Claims (2)

In constructing the front idler of the lower driving device for driving heavy construction equipment, the circumferential rim 51 of the front idler 50, which is in contact with the track, is divided into at least two unit members 52, 52, 52 which are equally divided. Combining split type, the space is sealed with a flange 53 between the circumference and the boss 55 is filled with a separate dust-proof agent 54 made of a lightweight material, the lower part for running of construction equipment Front idler of the drive. The front idler of claim 1, wherein the cross-sectional shape of the flange 53 joined to one side of the front idler 50 is formed in a curved surface.