JPH02186166A - Floating seal device - Google Patents

Abstract

PURPOSE:To prevent the generation of the unstable revolution and oil leak by springily press attaching each sealing surface of a pair of sealing rings through sliding by an elastic ring and arranging a ceramic member onto each sealing surface. CONSTITUTION:A rotary body 7 revolves on an axle 8 through the lubricating action of oil, and in this case, sealing surfaces 19b and 20b are elastically attached in sliding by the elastic rings 21 and 22, and one sealing surface 19b revolves, and the other sealing surface 20b is fixed, and the sealing surfaces 19b and 20b are revolution attached in sliding. Since ceramic members 30 and 31 are arranged onto the sealing surfaces 19b and 20b, the abrasion resistance, heat resistance. corrosion resistance, and galling resistance, and the seizureproofness of the sealing surfaces 19b and 20b are superior. Therefore, the deterioration of sealing performance due to the use under the severe working condition and the use for a long period is suppressed, and the oil leak is prevented, and the long service life can be secured.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a floating seal device used, for example, in a carrier roller of a track-type construction machine.

[Conventional technology]

Generally, as shown in FIG. 1, a crawler type construction machine has a running section 1 equipped with a track roller 2, a carrier roller 3, a front idler 4, and a sprocket 5, and a crawler belt 6 is wound around these.

Conventionally, floating seal devices used for these carrier rollers 3 and the like are known as disclosed in Japanese Utility Model Application Laid-open No. 120453/1982 and Japanese Patent Application Laid-open No. 91064/1983.

This conventional structure consists of a pair of seal rings whose respective seal surfaces are in elastic sliding contact with an elastic ring, and a ring groove is carved into each of the seal surfaces. It is constructed to prevent galling or seizure of the sealing surface that is in rotational contact under pressure.

[Problem to be solved by the invention]

However, in the case of the above conventional structure, although the pair of seal rings is made of special cast iron, with long-term use, galling, seizure, abnormal wear, and heat generation occur, resulting in a decrease in sealing performance, resulting in unstable rotation and oil leakage. This has the disadvantage that it may occur.

[Means to solve the problem]

The present invention aims to solve these disadvantages, and the gist thereof is to have a pair of seal rings in which the respective seal surfaces are pressed into sliding contact with each other by an elastic ring, and a ceramic material is arranged on each of the seal surfaces. A floating seal device is characterized in that it is configured by:

[Effect]

A sealing effect is obtained by the elastic sliding contact of each ceramic.

〔Example〕

2 to 5 show embodiments of the present invention, and 2.3
The figure shows the first embodiment, FIG. 4 shows the second embodiment, and FIG. 5 shows the third embodiment.

In the first embodiment shown in FIG. 2.3, the rotating body 7, which in this case is the carrier roller 3, is used, and 8 is an axle, and a flange portion 9 is formed in the center of the axle 8. A bearing body 11 having cylindrical bushings 10 on both left and right sides of the bearing body 11
, and the cylindrical bush 10 is attached to the bearing body 11 by Mr. Bin.
The rotating body 7 is fixed to the left and right bearing bodies 11 by bolts 13, and the cover unit 14 is mounted facing the outside of the left and right bearing bodies 11. Insert into 1118 and cover integrated I
4 is prevented from being pulled out with a C-shaped groove 5, a cutout surface 16 is formed on the axle 8 and the cover assembly 14, a bracket 17 is attached to the cutout surface 16 with bolts, and the bracket 17 is attached to the frame of the moeki running section 1. It is installed.

19. Summer is a pair of seal rings, in this case made of special cast steel, and the outer peripheral surfaces of each seal ring 19. The inner circumferential surfaces of the bearing body 11 and the cover assembly 14 facing 19 a - 20 a are also formed into tapered surfaces 11 a and 14 a that mutually form a V-shape, and the tapered surface 1
A pair of elastic rings 21.〃 made of rubber are interposed between 1 a, 14 a, L9 a and 20a, and the seal surfaces 19 b and 20 b of the seal rings 19 and 20 are brought into elastic sliding contact by the elastic rings 21 and n. , oil is sealed in the center hole n1 communication hole S in the axle 8, the gap 6, the communication groove, the recess τ, the communication passage public, and the communication hole 64, and this oil creates a gap between the cylindrical blank unit 0 and the axle 8. A pair of elastic rings 21 and 20b are connected between the sealing surfaces 19b and 20b of the seal ring 19, which rotates while providing lubrication, and the seal ring 20, which is in a fixed state.
22 provides a sealing effect and prevents oil leakage.

Reference numerals 30 and 31 are ceramic materials, and in this case, annular grooves 19c and 20c are formed on the sealing surfaces 19b and 20b.
, fill the concave grooves 1.9 c and 20 c with powdered ceramic material 30 and 31, and fix by pressurizing and heating.
After that, the sealing surfaces 19b and 20b are wrapped.

Since this first embodiment has the above-mentioned configuration, the rotating body 7 rotates on the axle 8 with the lubricating effect of oil, and at this time, the respective seal surfaces 19 b are secured by the elastic rings 21 and n.
・20 b are brought into pressure sliding contact with each other, and the side sealing surfaces 19 b
When rotates, the other seal surface 20b is fixed, the seal surfaces 19b and 20b are in rotational sliding contact, and the seal surfaces 19b and 20b are covered with ceramic materials 30 and 30, respectively.
31, the seal surfaces 19b-20b have good abrasion resistance, heat resistance, corrosion resistance, galling resistance, and seizure resistance, and have good sealing performance under harsh working conditions and long-term use. It is possible to suppress the decrease in the oil pressure, thereby preventing oil leakage and extending the service life.

The second embodiment shown in FIG. 4 and the third embodiment shown in FIG.
Ceramic materials 30 and 31 are coated on the entire surface of 9b-20b and formed by thermal spraying.

This 2nd and 3rd embodiment also obtains the same effects as the first embodiment.

Incidentally, as the ceramic materials 30 and 31, a mixture of alumina, titanium, zirconia, etc. is used.

〔Effect of the invention〕

As described above, in the present invention, since a ceramic material is provided on each sealing surface, the sealing surface has good wear resistance, heat resistance, corrosion resistance, galling resistance, and seizure resistance, and can be used under harsh working conditions. It is possible to suppress the deterioration of sealing performance due to long-term use, prevent oil leakage, and extend the service life.

As described above, the intended purpose can be fully achieved.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention; FIG. 1 is a usage state diagram, FIG. 2 is a sectional view of the first embodiment, FIG. 3 is an enlarged sectional view thereof, and FIG. 4 is a second embodiment. FIG. 5 is an enlarged sectional view of the third embodiment. 19.20... Seal ring, 19 b, 20
b... Seal surface, 21... Elastic ring, 30, 3
1...Ceramic material. January 11, 1999

Claims (1)

[Claims] 1. A floating seal device comprising a pair of seal rings whose respective seal surfaces are in elastic sliding contact with each other by an elastic ring, and a ceramic material is disposed on each of the seal surfaces.