KR100800077B1 - Track roller sealing device of caterpiller - Google Patents

Abstract

The elastic pressure of the plural O-rings mounted between the roller shell of the track roller and the roller support maintains the surface pressure on the sealing contact surface of the inner and outer floating seals as an initial state to prevent leakage of lubricating oil and prevent the inflow of foreign substances such as earth and sand. In the sealing device of a tracked track roller having a sealing O-ring mounted on the inclined surface of the floating seal mounted between the roller shell and the roller support, the O-ring is mounted on the inclined surface of the floating seal The first O-ring is brought into close contact with the mutually sealing contact surfaces of the floating seal by the elastic restoring force, and the second O-ring is mounted on the upper part of the floating seal to form a surface pressure at the upper end of the sealing contact surface.

Caterpillar, Floating Seal, Track Roller, Sealed, O-Ring

Description

Track roller sealing device of caterpiller

1 is a schematic view of a sealing device for a tracked track roller according to the prior art,

Figure 2 is an enlarged view of the excerpts of the "A" site shown in Figure 1,

Figure 3 is an enlarged view of the main portion extract of the sealing device of the tracked track roller according to the present invention,

Figure 4 is a state of use of the sealing device of the tracked track roller according to the present invention.

* Explanation of symbols used in the main part of the drawing

One; Roller shell

2; bushing

3; Roller shaft

4; incline

6; Internal floating seal

7; Roller support

9; Outer floating seals

11; incline

12; First O-Ring

13; 2nd O-Ring

The present invention maintains the surface pressure at the sealing contact surface of the inner and outer floating seals as an initial state by the elastic restoring force of a plurality of O-rings mounted between the roller sshell of the track roller and the roller support, thereby lubricating oil leakage. It relates to a sealing device of the tracked track roller to prevent the, and to prevent the inflow of foreign matter such as soil.

More specifically, due to the reaction force caused by the elastic deformation of the O-ring, which is additionally mounted to the floating seal, the surface pressure is also maintained at the end of the sealing contact surface of the floating seal to prevent leakage of lubricant due to the gap at the sealing contact surface. A sealing device for an orbital track roller.

In general, several track tracks are installed on the track track of heavy equipment having a tracked traveling device to prevent the track from sagging, and the weight of the heavy equipment is evenly distributed on the ground through the track and the rotation is smooth. There are a plurality of lower track rollers to make it easy

The track roller rotates at a high speed about the central axis according to the speed of the equipment and continuously receives an irregular and excessive impact depending on the road surface of the workplace. Therefore, the performance of the track roller can be evaluated by lubricity, strength and durability against high speed rotation and excessive external impact load.                         

Among these characteristics, strength and durability can be overcome by the selection of structural optimal shape and wear-resistant material, while the lubrication is difficult to design the sealing device in that it must ensure the smooth lubrication action of the internal lubricant and at the same time have a sealing property. This exists.

As shown in FIGS. 1 and 2, in the track roller of the crawler type traveling apparatus according to the prior art, the roller shell 1 is fitted to the bushing 2, and the bushing 2 has a roller shaft 3. Is coupled through, and an annular inner floating seal 6 equipped with a sealing annular O-ring 5 is coupled to the inclined surface 4 machined at both ends of the roller shell 1, and the roller shaft 3 An annular outer floating seal 9 having the o-ring 8 mounted on the inclined surface 11 on the inner side of the roller support 7 fitted to the inner ring seal 6 by the elastic restoring force of the o-rings 5, 8. Surface contact with a sealing function by the mutual sealing contact surface (10).

Due to this, when the roller shell 1 is rotated at a high speed with respect to the roller shaft 3 which is the central axis in the state of receiving the center load, the roller shell 1 and the bushing 2 and the roller shaft 3 Sliding contact generates considerable heat. Lubricant is injected to cool and lubricate this heat.

At this time, the inner floating seal 6 and the outer floating seal 9 uses forged chrome steel or cast chrome steel in consideration of durability and corrosion resistance, and the inclined surfaces 4 and 11 on which the O-rings 5 and 8 are mounted. Is precisely processed to have a constant surface roughness and inclined surface, which maintains a constant surface pressure between the sealing contact surfaces 10 processed with high precision by the elastic restoring force of the O-rings 5 and 8, thereby injecting into the gaps of the internal parts. Lubricants such as grease are not leaked to the outside, and foreign substances such as soil and sand can be prevented from flowing from the outside.

However, heavy construction equipment such as excavators are mainly used in outdoor construction sites where the working environment is poor due to the characteristics of the equipment. O-rings are always exposed to the outside, resulting in natural aging of the O-rings, which shortens the service life. As the rust occurs due to corrosion on the inclined surface, it is difficult to maintain the surface roughness of the inclined surface as an initial state, so that lubricants, etc. leak through the gap, and the corresponding parts are worn down, which shortens the service life.

For example, according to the results of overhaul of the 35 ton 5000 hour durability test equipment, all 18 track rollers mounted on one heavy equipment were rusted on the slopes on which the O-ring and O-ring were mounted. It was confirmed that the estimated 5-7% permanent deformation occurred.

In addition, O-ring's elastic restoring force makes it difficult to maintain a constant surface pressure on the sealed contact surface processed with high precision of the inner and outer floating seals. It could be confirmed that a gap is generated due to rust. The presumed reason is that the elastic restoring force of the O-ring generated from the O-ring mounting surface does not reach the outer end of the sealing contact surface at a considerable distance.

An object of the present invention is to prevent the leakage of lubricant due to the gap in the sealing contact surface by maintaining the surface pressure at the end of the sealing contact surface of the floating seal due to the reaction force caused by the elastic deformation of the O-ring additionally mounted to the floating seal It is to provide a sealing device of a tracked track roller.

It is another object of the present invention to prevent the inflow of foreign matter such as soil and sand from the outside to the inclined surface of the floating seal on which the O-ring is mounted, and to provide a sealing device for an endless track roller to prevent surface roughness and rust generation of the inclined surface. To provide.

The object of the present invention described above is a sealing device for an endless track roller having a sealing O-ring mounted on an inclined surface of a floating seal mounted between a roller shell and a roller support, wherein the O-ring is mounted on an inclined surface of the floating seal. And a second O-ring mounted to closely contact the mutually sealing contact surfaces of the floating seal by elastic restoring force, and a second O-ring mounted on the upper portion of the floating seal to form surface pressure at the upper end of the sealing contact surface. By providing a sealing device.

DETAILED DESCRIPTION Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings, which are intended to explain in detail enough to enable those skilled in the art to easily practice the present invention. This does not mean that the technical spirit and scope of the present invention is limited.

As shown in FIGS. 3 and 4, the present invention provides a roller shell 1 rotatably mounted to a bushing 2 coupled to a roller shaft 3, a roller shell 1 and a roller support 7. The inner and outer floating seals (6,9) mounted between the and the inclined surfaces (4,11) of the floating seals (6,9) to be in close contact with the sealing contact surface (10) inclined surface (4,11) It is applied to the sealing device of the tracked track roller having a sealing O-ring to prevent the inflow of foreign substances such as earth and sand, and to prevent the leakage of lubricating oil through the gap of the sealing contact surface 10, these are shown in FIG. Since it is substantially the same as the track roller according to the prior art, the same components are denoted by the same reference numerals, and detailed descriptions thereof will be omitted.

Accordingly, in the sealing device for the tracked track roller according to the present invention, the O-ring is mounted on the inclined surfaces 4 and 11 of the inner and outer floating seals 6 and 9 so that the floating seal 6 is formed by its elastic restoring force. And the first o-ring 12 for closely contacting the mutually sealing contact surface 10 of the second and second o-rings 13 mounted on the floating seals 6 and 9 to form a surface pressure at the upper end of the sealing contact surface 10. )

Hereinafter, the operation of the sealing device of the tracked track roller according to the present invention will be described in detail with reference to the accompanying drawings.

As shown in FIG. 4, the floating seals 6, 9 are provided by a plurality of sealing O-rings mounted on the inner and outer floating seals 6, 9 mounted between the roller shell 1 and the roller support 7. It is possible to prevent the lubricating oil leakage through the mutual sealing contact surface (10) of.

That is, floating by the elastic restoring force (acting in the direction perpendicular to the inclined surfaces 4, 11) of the first O-ring 12 mounted on the inclined surfaces 4, 11 of the inner and outer floating seals 6, 9, respectively. It is possible to form a surface pressure for bringing the sealing contact surface 10 of the seals 6 and 9 into close contact.

On the other hand, due to the reaction force caused by the elastic deformation of the second O-ring 13 mounted on the upper portion of the floating seal (6, 9) by forming a surface pressure on the upper end of the sealing contact surface 10, the floating seal (6, 9) Since the mutual adhesion of the improved, it is possible to prevent the leakage of the lubricating oil through the gap of the sealing contact surface (10).

In addition, from the outside to the inclined surface (4, 11) of the floating seal (6, 9) on which the first O-ring 12 is mounted by the second O-ring 13 mounted above the first O-ring (12) It is possible to block the inflow of foreign matter, and to prevent the surface roughness of the inclined surfaces (4, 11) to be broken.

As mentioned above, this invention has the following advantages.

Due to the reaction force caused by the elastic deformation of the O-ring, which is additionally attached to the floating seal, the surface pressure is stably maintained at the end of the sealing contact surface of the floating seal, thereby preventing leakage of lubricant due to gaps in the sealing contact surface. Can be prevented.

In addition, it prevents the inflow of foreign matter such as soil and sand from the outside to the inclined surface of the floating seal on which the O-ring is mounted, and maintains the surface roughness on the inclined surface as an initial state and prevents the occurrence of rust.

Claims (1)

In the sealing device of a tracked track roller having a sealing O-ring mounted on an inclined surface of a floating seal mounted between a roller shell and a roller support: The O-ring; A first o-ring mounted on an inclined surface of the floating seal to closely contact the mutual sealing contact surfaces of the floating seal by an elastic restoring force; And And a second O-ring mounted on an upper portion of the floating seal to form a surface pressure at an upper end of the sealing contact surface.

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