JPH0210381Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] The invention is particularly used as an external seal.
This invention relates to a floating seal that seals muddy water etc. from the outside space in the caterpillars, idler wheels, etc. of civil engineering and construction machinery.

[Conventional technology]

Conventionally, this type of floating seal
The one shown in FIG. 2 is widely used.
In the figure, reference numerals 1 and 6 are a pair of floating rings made of cast iron and loosely fitted around the outer periphery of the fixed shaft 2, and the cross-sectional shape is approximately L-shaped. The other floating ring 6 is supported on the inner periphery of the circumferential step 4 of the non-rotating flange 3 via a packing 5 made of nitrile rubber (NBR), and the other floating ring 6 is supported on the inner periphery of the circumferential step 4 of the non-rotating flange 3. It is supported on the inner periphery of the portion 8 via a packing 9 similar to the packing 5 on the non-rotating side. Both packings 5 and 9 maintain airtightness between the flange 3 and the floating ring 1 on the non-rotating side and between the housing 7 and the floating ring 6 on the rotating side due to their elastic properties. Since the shape is inclined inward from the fitting parts 5a and 9a with the housing 7 to the fitting parts 5b and 9b with the floating ring 1 or 6, the two floating rings 1 and 6 are attached to both sides in the axial direction. They are pressed and biased to bring them into sliding contact with each other and to restrict displacement in the radial direction.

[Problem that the invention attempts to solve]

However, according to the above configuration, since both floating rings 1 and 6 are made of cast iron, the outer diameter surfaces 1a and 6a as well as the sliding rings are in direct contact with muddy water etc. that enter through the gap 10 between the flange 3 and the housing 7. Rust is likely to occur on the sliding surfaces 1b, 6b, and since the surface pressure of the sliding surfaces 1b, 6b is set to be relatively large, there is a problem in that the sliding torque is high.

The present invention was devised in view of the above-mentioned problems with the purpose of preventing the floating ring from rusting and providing smooth sliding characteristics.

[Means for solving problems]

As a means to achieve this objective, the floating seal of the present invention has a coating material made of tetrafluoroethylene resin applied to the entire surface of the floating ring, and a rough surface is formed on the surface of the coating material that fits into the packing. It has been processed.

[Effect]

In other words, the entire surface of the floating ring is 4
Because it is coated with fluorinated ethylene resin material,
The cast iron material, which is the main material of the floating ring, is not directly exposed to the muddy water, etc., and the resin material has excellent lubricity, so the sliding torque is reduced, and the packing is made using this resin material. Since the ring is fitted with the roughened surface of the ring, the packing and floating ring will not slip against each other due to the sliding torque.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings. In each embodiment, the same reference numerals are used for parts having the same configuration as the conventional floating seal shown in FIG. 2 described above to avoid duplication of explanation.

That is, in the embodiment shown in FIG. 1, coating materials 13 and 14 made of tetrafluoroethylene resin are applied to the entire surfaces of both floating rings 11 and 12, and the packing materials 5 and 14 in the coating materials 13 and 14 are The fitting surfaces 13' and 14' with the packings 5 and 9 are roughened (not shown) for the purpose of preventing relative sliding (rotation) with the packings 5 and 9.

According to the above embodiment, the flange 3 on the non-rotating side
Mud water, etc. that enters from the gap 10 between the housing 7 and the rotating side housing 7 can leak into the floating rings 11, 1.
Not only do they not come into contact with the cast iron parts of rings 11 and 12, but also the sliding torque of both rings 11 and 12 is reduced due to the lubricating properties of the coating materials 13 and 14.

[Effect of idea]

As is clear from the above explanation, the floating seal of the present invention has a coating material made of tetrafluoroethylene resin applied to the entire surface of the floating ring whose sliding material is cast iron, etc., which prevents rust. The sliding torque on the sliding surface is reduced, and the packing does not slip even though the floating ring is coated with a lubricating coating material, resulting in excellent seal durability. It is something that demonstrates the.

[Brief explanation of drawings]

FIG. 1 is a half-cut side sectional view showing an embodiment of the floating seal of the present invention, and FIG. 2 is a half-cut side sectional view showing a conventional floating seal. 2... Fixed shaft, 3... Flange, 5, 9... Packing, 7... Housing, 11, 12... Floating ring, 13, 14... Coating material.

Claims (1)

[Scope of utility model registration request] It is loosely fitted onto the outer periphery of the fixed shaft and is airtightly supported through packings on the rotating side and fixed side, respectively, and is elastically pressed by both packings and slides closely against each other, thereby preventing muddy water from outside. A coating material made of tetrafluoroethylene resin is applied to the entire surface of a pair of floating rings made of cast iron or the like to prevent the infiltration of foreign matter, and the surface of the coating material that fits into the packing is roughened. A floating seal characterized by being subjected to.