JPH0524867Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a floating seal device, and in particular, to a floating seal device suitable for sealing bearings in endless track sections of construction machines and the like.

[Conventional technology]

2. Description of the Related Art Generally, floating seals are used in rotating parts of endless track sections of construction machines and the like to prevent the intrusion of earth, sand, muddy water, and the like.

And, as this type of conventional sealing device,
For example, the one shown in Japanese Utility Model Publication No. 48-266 and shown in FIG. 8 is known.

The device shown in FIG. 8 has a fixed collar 51 arranged around the end of the shaft 50, and
A fixed-side seal ring 53 is inserted into the inner peripheral side of the shaft 50 via a fixed-side O-ring 52, and a rotating-side housing 54 that makes sliding contact with this seal ring 53 is arranged around the shaft 50.
4 is pressed against a rotating roller 56 via a rotating O-ring 55, and the rotating roller 56 is connected to the shaft 50 via a bearing 57.

In this device, as the rotating roller 56 rotates, the rotating O-ring 55 and the rotating housing 5
4 rotates, at which time the rotating housing 54 and the stationary seal ring 53 come into sliding contact with each other to prevent earth and sand from entering the bearing 57 side.

[The problem that the idea aims to solve]

However, in the case of the device shown in FIG. 8, the surfaces of the seal ring 53 and the housing 54 must be formed into a tapered shape, which requires time and the seal ring 53 and the housing 54 are attached to the shaft 50. Since the seal portion is arranged along the axial direction, the size of the seal portion cannot be reduced.

Furthermore, a seal ring 53, a housing 54,
When assembling the O-rings 52 and 55, there was a problem in that these parts tended to fall off.

An object of the present invention is to provide a floating seal device that can simplify the structure of the seal portion and facilitate assembly.

[Means to solve the problem]

In order to achieve the above object, the present invention provides a fixed seal ring having a substantially U-shaped groove formed on the outer circumferential side and attached to the outer circumferential surface of a rotating shaft, and a fixed seal ring that is inserted into the U-shaped groove of the fixed seal ring. The rotary seal ring is in sliding contact with the side facing away from the bearing among both sides of the groove, and the U-shaped groove of the stationary seal ring is approximately accommodated in a region extending in the radial direction of the rotary shaft, and the outer periphery of the rotary seal ring is a rotating housing abutting the surface via an annular sealing member, the stationary seal ring being fixed to the stationary housing disposed around the end of the rotating shaft, and the rotating housing being connected to the rotating shaft via a bearing. This is a floating seal device that is crimped onto a connected rotating body.

[Effect]

By adopting the above-mentioned means, the present invention allows the fixed seal ring, rotating seal ring, and rotating housing to be arranged along the radial direction of the rotating shaft, making it possible to shorten the dimensions of the seal portion. . Furthermore, since the rotary seal and the rotary housing are accommodated in the area of the U-shaped groove of the stationary seal ring, the parts can be assembled without falling out or tilting.

〔Example〕

Hereinafter, one embodiment of the present invention will be described based on the drawings.

In FIG. 1, a fixed housing 11 is disposed around the end of the rotating shaft 10, and the end of the fixed housing 11 is formed with a substantially U-shaped cross section so that the outer peripheral surface of the rotating shaft 10 has a substantially U-shaped cross section. The inserted fixed seal ring 12 is fixed, and an O-ring 13 is inserted between the fixed seal ring 12 and the rotating shaft 10.

A rotary seal ring 16 is inserted into a U-shaped groove 15 on the outer peripheral side of the fixed seal ring 12 .

This rotary seal ring 16 is arranged so as to be in sliding contact with a side surface 15A of the U-shaped groove 15 that is remote from the bearing 18. Furthermore, a rotating O-ring 19 as a sealing member is inserted into the outer peripheral side of the rotating seal ring 16.

The rotary seal ring 16 is in contact with the rotary housing 20 via a rotary O-ring 19. The rotating housing 20 has a substantially L-shaped cross section, and has a groove 2 formed at the end of the rotating roller 14.
1 through an O-ring 17.

A fitting notch 23 is formed in the side wall 22 of the rotating housing 20 on the bearing 18 side, as shown in FIGS. 2 and 3.

As shown in FIGS. 4 and 5, this notch 23 is formed so that a protrusion 24 formed on the bearing 18 side of the fixed seal ring 12 can be inserted therethrough.

That is, when the rotary housing 20 is accommodated in the area of the U-shaped groove 15, the protrusion 24 is inserted into the side wall 22.
It is designed so that it can be inserted through the notch 23 of.

Furthermore, the side surface 15A of the stationary seal ring 12 is subjected to treatments such as hardening, thermal spraying, and plating, so that the hardness and corrosion resistance can be improved by sliding contact with the rotating seal ring 16. There is.

In the above configuration, when the rotary roller 14 rotates, the rotary housing 20, the rotary ring 19, and the rotary seal ring 16 rotate with this rotation.

At this time, the rotating seal ring 16 rotates while slidingly contacting the stationary seal ring 12. This prevents dirt and the like from entering the bearing 18 side.

In this embodiment, one side of the bearing 18 is sealed, but the same seal is arranged on the other side of the bearing 18.

Further, the rotating shaft 10 and the rotating roller 14
As a way to seal between the
I explained about the one with ring 17 inserted,
As shown in FIG.
Seal members 25 and 26 made of rubber, resin, etc. are provided on the mounting surface side of the rotating shaft 10 and on the mounting surface side of the rotating housing 20 and the rotating roller 14.
Sealing performance can also be ensured by baking or coating.

Moreover, it is also possible to use a packing type rubber ring instead of the rotating ring 19.

In addition, when polishing the side surface 15A of the fixed seal ring 12, if the side surface 15A is ramped along the circumferential side, distortion will not occur on the side surface 15A even if caulking is performed on the side surface 15A. It is.

When performing this lapping, the lapping plate 27 is swung while the fixed seal ring 12 is rotated, as shown in FIG. Note that there is no need to swing if accuracy can be obtained only by rotation during the lap.

[Effect of idea]

As explained above, according to the present invention, the fixed seal ring, the rotary seal ring, and the rotary housing are arranged along the radial direction of the rotary shaft, and the rotary housing and the rotary seal ring are arranged in the U-shaped groove of the fixed seal ring. Since it is accommodated within the area, the dimensions of the seal portion can be reduced and the structure of the device can be simplified.

Furthermore, when assembling each member, it is possible to easily assemble the parts without causing them to fall off or incline, and it has excellent effects such as contributing to the improvement of the assembling work.

[Brief explanation of the drawing]

Fig. 1 is a vertical sectional view of the main part showing one embodiment of the present invention, Fig. 2 is a side view of the main part of the rotating housing, and Fig. 3 is a side view of the main part of the rotating housing.
The figure is a sectional view of the main part along the - line in Fig. 2, Fig. 4 is a side view of the main part of the fixed seal ring, and Fig. 5 is a sectional view of the main part of the fixed seal ring.
Fig. 6 is a longitudinal sectional view of the main part showing another embodiment of the present invention, Fig. 7 is a sectional view for explaining the lapping process, and Fig. 8 is the conventional example. FIG. 10... Rotating shaft, 11... Fixed housing, 12... Fixed seal ring, 14... Rotating roller, 15... U-shaped groove, 18... Bearing,
19... Rotating O-ring, 20... Rotating housing.

Claims (1)

[Scope of utility model registration request] A fixed seal ring that has a substantially U-shaped groove formed on its outer circumferential side and is attached to the outer circumferential surface of the rotating shaft, and a fixed seal ring that is inserted into the U-shaped groove of the fixed seal ring and that side that is away from the bearing among both sides of the groove. a rotary seal ring that is in sliding contact with the rotary seal ring; and a rotary housing that is substantially accommodated within a region in which the U-shaped groove of the fixed seal ring is extended in the radial direction of the rotary shaft, and that abuts the outer circumferential surface of the rotary seal ring via an annular seal member. and the fixed seal ring is fixed to a fixed housing disposed around an end of the rotating shaft, and the rotating housing is crimped to a rotating body connected to the rotating shaft via a bearing. Floating seal device.