JP2000161498A - Sealing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sealing device which suppresses entrance of foreign materials such as dusts, thereby keeps and improves sealability. SOLUTION: A first sealing member 5 having a main lip 5c and a sub-lip 5d is assembled with a second sealing member 6 having a dust lip 6b on the side of the sub-lip 5d of the first sealing member 5. The main lip 5c of the first sealing member 5 does not perfectly seal a sealed object to the side of a sealing side M. The sealing of the object depends upon the sub-lip 5d to the extent that lubricancy of the sub-lip 5d can be kept.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sealing device and a technique for preventing dust from entering.

[0002]

2. Description of the Related Art Conventionally, various types of dust seals have been employed to prevent foreign substances such as dust from entering a bearing portion of a roller guide.

FIG. 4 shows a bearing 1 of a roller guide 100.
FIG. 2 is a view for explaining an example of a cross-sectional structure of the roller guide 100. An end shaft portion 102 of a roller guide 100 is rotatably supported by a mounting housing 104 via a bearing 103.

The mounting housing 104 is provided with a surface 104a facing the end shaft 102 on the roller 105 side of the roller guide 100, and two sealing devices 106 and 107 are provided on the surface 104a. Sealing device 106, 1
07 is a sliding sleeve 1 fitted in the end shaft 102.
08 is in sliding contact with the outer peripheral surface.

[0005] An annular end member 109 is mounted on the end shaft 102 side of the roller 105 of the mounting housing 104, and a sealing device 110 is provided on the facing surface 109 a of the end member 109. Part 102
The sliding sleeve 111 is in sliding contact with the outer peripheral surface of the sliding sleeve 111 fitted into the sliding sleeve 111.

Thus, the sealing devices 106, 107, 1
10 prevents foreign substances such as dust from entering the bearing 103 and protects the bearing 103.

As a specific application example of the roller guide 100, for example, as shown in FIG. 5, a large number of long guides 202 cast from a mold 201 of a continuous casting machine 200 are arranged in a large number on both sides of a conveyance path. , Long castings 202
Some functions as a means for changing the direction and conveying means.

In such an application, the roller guide 100
A large load is applied, and the rotation accuracy of the roller guide 100 (it is desirable that the occurrence of eccentricity and backlash is small).
This may affect the dimensional accuracy (thickness, flatness, etc.) of the long casting 202 by the roller guide 1.
Therefore, high-precision rotation by the bearing 103 provided for the motor 00 is required.

In order to protect the bearing 103, sealing devices 106, 107, 110 and the like are provided.

FIG. 2 is an explanatory sectional view of a conventional sealing device 106 used for the roller guide 100. In the drawing, the sealing device 106 fits into a mounting portion 104b provided on a facing surface portion 104a of a housing 104. And
The mounting position in the axial direction is regulated by the flange portion 104c.

The sealing device 106 includes a reinforcing ring 1 having an L-shaped cross section.
06a, a fitting portion 106b made of a rubber-like elastic body formed so as to cover the periphery of the reinforcing ring 106a (particularly, the outer peripheral side of the reinforcing ring 106a), and a radial portion 10 of the reinforcing ring 106a.
6a1 includes a seal portion 106c extending from the inner diameter side.

The seal portion 106c has a main lip 106c1 on the sealing side M where a sealing fluid (for example, lubricating oil such as oil or grease) exists, and a dust lip 106c2 on the outer side O for preventing intrusion of dust or the like. Are located.

The main lip 106c1 is provided with a spring ring 106 for increasing the tightening force of the lip tip 106c3.
d is provided on the back side of the lip. And the sealing side M
Lip tip 10
6c, the tip R is set small, and the oil level angle α on the sealed side M is set.
101 is set large, and the oil level angle β101 on the outer side O is set small.

With such a configuration, dust (fine foreign matter and the like) from the outside O is prevented from entering by the dust lip 106c2, and leakage of the sealed fluid on the sealed side M is prevented by the main lip 106c1.

Furthermore, the sealing device 151 shown in FIG.
The main seal portion 152 having a main lip and the dust seal portion 153 having a dust lip are constituted by independent components, and a fixing portion of the dust seal portion 153 is provided on an outer periphery of a fitting portion 152a of the main seal portion 152. 153a is an assembly type fitted.

In the sealing device 151, the housing 16
0 fixed portion 15 of the dust seal portion 153 with respect to the inner circumferential surface.
3a and a fitting portion 152a of the main seal portion 152
(Particularly, the outer peripheral rib portion 152b made of a rubber-like elastic body) is fitted.

[0017]

However, when the sealing device 106 is used for the roller guide 100 used in the above-described continuous casting machine 200 and the like, the sealing device 106 is used in an environment where there is much dust such as metal powder. As a result, a large amount of dust penetrates (a large amount of dust such as water, scale, powder, etc., as in the roller guide 100 near the continuous casting machine 200), and the main lip cannot be prevented by the dust lip 106c2. Dust penetrates into the 106c1 side, promoting wear of the dust and the main lip and abrasion of the shaft, and there is a concern that sealing performance and durability may be reduced.

In the sealing device 151 of the type in which the main lip and the dust lip are combined, the fitting portion 152a and the fixing portion 153a are fitted and combined with each other, and the main seal portion 152 and the dust seal portion 153 are combined. Since both are fitted on the inner peripheral surface of the housing 160, strong fitting and fixing can be achieved. However, workability at the time of mounting and removing is low, and a sealing device with better incorporation is desired. Was rare.

The present invention has been made to solve the above-mentioned problems of the prior art. It is an object of the present invention to suppress the invasion of foreign substances such as dust and maintain the sealing performance and improve the durability. Another object of the present invention is to provide a sealing device with good incorporation.

[0020]

In order to achieve the above object, according to the present invention, there is provided a cylindrical fitting portion fixed to one of two opposing surfaces forming an annular gap, and a cylindrical fitting portion. A first seal member having a main lip and a sub lip extending radially from the fitting portion and abutting on the other surface; and a cylindrical shape of the first seal member on a sub lip side of the first seal member. A second seal member having a fixed ring portion attached to the fitting surface side of the fitting portion and a dust lip extending radially from the fixed ring portion and abutting against the other surface; The main lip of the first sealing member has a radius at the tip of the lip, and the oil surface angle on the sealing side is set smaller than the oil surface angle on the anti-sealing side, so that the object to be sealed is lubricated on the sub lip side. On the sub lip side to maintain the performance Characterized in that to allow feeding.

According to this, since the object to be sealed is appropriately supplied from the main lip to the sub lip side, lubricity between the main lip and the sub lip and the other surface with which these lips abut is maintained, and wear is reduced. In addition to suppressing the dust, the flow of the object to be sealed from the main lip to the sub lip side and further to the dust lip side can be expected to have an effect of suppressing dust intrusion.

In addition, dust is prevented from entering by two steps of dust lip of the second seal member and sub-lip of the first seal member, so that dust resistance is improved.

The cylindrical fitting portion of the first seal member has a metal ring having a sub-lip exposed and a rubber-like elastic portion covering the main lip of the metal ring. The fixed portion of the seal member has a metal ring fitted and assembled to the exposed portion of the metal ring of the first seal member, and has one of the two opposing surfaces forming the annular gap and the second surface.
It is also preferable that a gap is provided between the metal ring of the sealing member and the cylindrical fitting portion is fixed to one of two opposing surfaces forming an annular gap by the rubber-like elastic body portion. is there.

According to this, the first seal member and the second seal member are connected by fitting between the metal rings.
Both can be firmly combined. Further, when the sealing device is fixed to one of the two opposing surfaces such as the inner peripheral surface of the housing, only the rubber-like elastic body portion of the first metal ring is fitted to the one surface. And the detachability is improved. According to this, since the object to be sealed is appropriately supplied from the main lip to the sub lip side, the main lip and the sub lip are in contact with the lip and the second lip member. Lubricity between the surface is maintained, it is possible to suppress wear,
The flow of the object to be sealed from the main lip to the sub lip side and further to the dust lip side can also be expected to have an effect of suppressing intrusion of dust.

In addition, dust is prevented from entering by two steps of dust lip of the second seal member and sub-lip of the first seal member, so that dust resistance is improved.

Further, the second seal member is assembled to the cylindrical fitting portion of the first seal member, so that the assembling and mounting of the sealing device are improved.

The main lip of the first seal member is
It is also preferable that a radius is provided at the tip of the lip so that the oil level angle on the sealed side is set smaller than the oil level angle on the non-sealed side.

With such a main lip, an object to be sealed can be appropriately supplied from the main lip to the sub lip side.

The fixed portion of the second seal member is mounted on the outer peripheral side of the cylindrical fitting portion of the first seal member, and forms an annular gap with the fixed portion of the second seal member. It is also preferable to provide a gap between one of the opposing surfaces.

By doing so, it is possible to eliminate the contact between the second seal member and one of the two opposing surfaces, and to improve the mounting and detachability of the sealing device.

[0031]

(Embodiment 1) FIG. 1 is a view for explaining the configuration of a sealing device 1 according to a first embodiment. The sealing device 1 seals an annular gap 4 between a shaft hole 2a of the housing 2 as an opposing surface and an outer peripheral surface 3a of the shaft 3.

The sealing device 1 includes a first sealing member 5 and a second sealing member 5.
The seal member 6 is composed of two seal members.

The first seal member 5 includes a reinforcing ring 5a having an L-shaped cross section, comprising a cylindrical portion 5a1 and a radial portion 5a2 bent inward from one end of the cylindrical portion 5a1, and a reinforcing ring 5a.
And a cylindrical fitting portion 5b, a main lip 5c, and a sub lip 5d made of a rubber-like elastic body integrally formed around the periphery. The fitting portion 5b is the housing 2
Is fixed to the shaft hole 2a.

The main lip 5c and the sub lip 5d are
The main lip 5c extends from the radial portion 5a2 of the reinforcing ring 5a, and the main lip 5c is disposed on the sealing side M where an object to be sealed (lubricant such as oil or grease) is present. 5d are arranged.

The main lip 5c has a lip tip 5c1.
By setting the oil level angle α1 on the sealing side M smaller than the oil level angle β1 on the outer side O, which is the anti-sealing side, the sealing object is not completely sealed on the sealing side M, and the sub lip 5d Can be supplied to the sub-lip 5d to the extent that the lubricity of the sub-lip 5d can be maintained.

The sub lip 5d is a scraper type lip inclined toward the outer side O and functions as a dust lip.

The second seal member 6 includes a fixing portion 6a which is assembled to the outer peripheral side of the cylindrical portion 5a1 of the reinforcing ring 5a having a reduced diameter by one step at the cylindrical fitting portion 5b of the first seal member 5. And a dust lip 6b extending inward from the fixing portion 6a and abutting against the outer peripheral surface 3a of the shaft 3.

The fixing portion 6a of the second seal member 6
Is provided with a gap between it and the shaft hole 2a of the housing 2 so that the sealing device 1 can be easily attached and detached with the second sealing member 6 fixed to the first sealing member 5. Becomes possible.

According to the sealing device 1 having such a configuration, an object to be sealed is appropriately supplied from the main lip 5c to the sub lip 5d side, so that the outer periphery of the main lip 5c and the sub lip 5d and the shaft 3 where these lips abut. Lubricity between the surface 3a is maintained, wear can be suppressed, and the flow of an object to be sealed from the main lip 5c to the sub lip 5d and further to the dust lip 6b suppresses dust from entering. Can also be expected.

In addition, dust can be prevented from entering by two steps of the dust lip 6b of the second seal member 6 and the sub lip 5d of the first seal member 5.
Dust resistance is improved.

Further, the second seal member 6 is assembled to the cylindrical fitting portion 5b of the first seal member 5, so that the assembling and mounting of the sealing device 1 are improved.

[0042]

As described above, according to the sealing device to which the present invention is applied, it is possible to suppress the invasion of foreign substances such as dust, to maintain the sealing performance and to improve the durability, and to assemble and mount. Improve the performance.

[Brief description of the drawings]

FIG. 1 is an explanatory view of a cross-sectional configuration of a sealing device according to an embodiment.

FIG. 2 is an explanatory view of a cross-sectional configuration of a conventional sealing device.

FIG. 3 is an explanatory view of a cross-sectional configuration of a conventional sealing device.

FIG. 4 is a view for explaining a usage form of a conventional sealing device.

FIG. 5 is a perspective view of a continuous casting machine in which a sealing device is used.

[Explanation of symbols]

 Reference Signs List 1 sealing device 2 housing 2a shaft hole 2b annular groove 3 shaft 3a outer peripheral surface 4 annular gap 5 first seal member 5a reinforcing ring 5b fitting portion 5c main lip 5d sub lip 6 second seal member 6a fixing portion 6b dust lip M Sealed side O External side

Claims (2)

[Claims] 1. A cylindrical fitting portion fixed to one of two opposing surfaces forming an annular gap, and a main lip extending radially from the cylindrical fitting portion and in contact with the other surface. A first seal member having a first seal member and a sub-lip; a fixed ring portion attached to a sub-lip side of the first seal member on a fitting surface side of a cylindrical fitting portion of the first seal member; A second seal member having a dust lip extending radially from the ring portion and abutting on the other surface, wherein the main lip of the first seal member has a radius at a lip tip, and has a seal. By setting the oil level angle on the side to be smaller than the oil level angle on the non-sealing side, the object to be sealed can be supplied to the sub lip side to the extent that the lubricity on the sub lip side can be maintained. Sealing device. 2. The cylindrical fitting portion of the first seal member includes a metal ring having a sub lip exposed and a rubber-like elastic body covering the main lip of the metal ring. The fixing portion of the second seal member has a metal ring fitted and assembled to the exposed portion of the metal ring of the first seal member, and one of the two opposing surfaces forming the annular gap and the second surface. A gap is provided between the seal member and the metal ring of the second seal member, and the cylindrical fitting portion is fixed to one of two opposed surfaces forming an annular gap by the rubber-like elastic body portion. The sealing device according to claim 1, wherein