JP2605197Y2 - Sealing device - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sealing device applied to, for example, a bearing of a continuous casting machine.

[0002]

2. Description of the Related Art As a conventional sealing device of this kind, for example, there is one as shown in FIG.

In FIG. 4, a shaft 101 is
Annular housing 10 provided to surround the outer periphery of
The bearing 106 is rotatably supported via a bearing 106. Oil seals 103, which are sealing devices, are provided at two places on both sides of the bearing 106 to prevent dust and the like from entering the inside of the bearing 106. I have. In addition, a roll 1 is
04 is attached.

The oil seals 10 provided at the two locations
Reference numeral 3 denotes a seal lip 131 whose outer periphery is fitted to two mounting portions 105 formed on the housing 102 and which is slidably and sealingly contacted with the shaft 101 on the inner peripheral side.
The direction of the lulip 131 is directed to the atmosphere side to prevent dust and water from entering the bearing 106 side. In addition,
A spring 132 for increasing the tightening force is mounted on the outer peripheral side of the rulip 131.

On the other hand, a lubricant B is injected into the bearing 106 in order to lubricate the rolling elements.
Of the seal lip 131 is circulated in a state of being dripped to the atmosphere side through a contact surface portion of the seal lip 131 with the shaft 101.

[0006] The reason why the lubricant B is made to run down is that there is no sealing device that can cope with the case where the lubricant B is sealed because the environmental conditions are poor in a continuous casting machine or the like.

[0007]

However, in the above-described conventional sealing device, the seal contacting the shaft 101 is not provided.
Since the lulip 103 is formed of a rubber-like elastic material, the sliding surface between the seal lip 103 and the shaft 101 is easily worn. Due to the progress of abrasion of the sliding surface, even when the lubricant B is dripped, the seal surface pressure is reduced at an early stage, and there is a problem that intrusion of dust and water from the atmosphere side cannot be avoided. On the other hand, if the surface pressure is increased, abrasion of the sliding surfaces of the seal lip 103 and the shaft 101 will be promoted.

Further, since the frictional resistance between the seal lip 131 and the shaft 101 is large, there is a problem that torque loss during rotation increases.

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 use a resin material having low friction and high abrasion resistance as a seal member, and to use a seal member. It is an object of the present invention to provide a sealing device having high performance and a function of discharging a liquid to be sealed.

[0010]

In order to achieve the above object, the present invention seals an annular gap between two rotating members which are mounted concentrically and relatively rotatably. A resin seal member and an elastic seal member made of a rubber-like elastic material are combined, and the elastic seal member is mounted on the inner side of an annular groove provided on one of the two rotating members, and the resin seal member is made of a resin. A seal member is mounted on the open end side of the annular groove, and the resin seal member is pressed against the surface of the other rotating member by the elastic force of the elastic seal member to make slidable sealing contact with the other rotating member. A passage for discharging the liquid to be sealed to the atmosphere side is formed in the resin seal member and the elastic seal member mounted in the annular groove,
In the middle of the passage formed in the sealing member, the liquid to be sealed
When the pressure difference between the air and the atmosphere exceeds a predetermined pressure,
It is characterized by having a projection serving as a lube mechanism .

Further, the elastic seal member is provided with an undercut to reduce the pressing force on the resin seal member.

[0012]

In the sealing device constructed as described above, the sealing member made of resin is slidably and slidably in contact with the sliding surface, so that the liquid to be sealed leaks to the atmosphere side and dust and water from the atmosphere side. , Etc., is prevented from entering. Since the resin material is smoother and harder than the rubber-like elastic material, the sliding resistance is reduced and the wear is reduced. Further, the liquid to be sealed is discharged to the atmosphere through the passage. In addition, the elastic
In the middle of the passage formed in the sealing member,
Valve that opens the passage when the pressure difference with the air side exceeds a predetermined pressure
Since a projection is provided as a mechanism,
Discharge to the atmosphere side due to the pressure difference between the liquid to be sealed and the atmosphere side
More control is possible.

Further, if the elastic seal member is provided with a fleshy portion for reducing the pressing force on the resin seal member, the tightening force of the resin seal member on the sliding portion is reduced.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the illustrated embodiment.

(First Embodiment) FIG. 1 shows a sealing device according to a first embodiment which is a basic technique for explaining the present invention.

That is, the sealing device of the present embodiment is a dust seal 3 for preventing dust and water from entering the inside of a device to which bearings and the like are attached. The dust seal 3 covers the shaft 1 and the outer periphery of the shaft 1. In order to seal a gap between the shaft 1 and a housing 2 provided concentrically and rotatably relative to each other so as to surround it, in this embodiment, a rectangular cross section provided on the inner periphery of the housing 2 is provided. It is mounted in an annular groove 5 having a shape.

The dust seal 3 includes a resin seal member 31 on the inner peripheral side and a rubber seal member 32 formed of a rubber-like elastic material as an elastic seal member on the outer peripheral side.
The outer peripheral surface of the resin seal member 31 on the inner peripheral side and the inner peripheral surface of the rubber seal member 32 on the outer peripheral side are liquid-tightly adhered to each other. In this embodiment, the resin seal member 31 and the rubber seal member 32 move integrally in the annular groove 5 in the axial direction.

That is, the rubber seal member 32 is mounted on the inner side of the annular groove 5 provided in the housing 2 in a state of being crushed in the radial direction, and the resin seal member 31 is mounted.
Is mounted on the open end side of the annular groove 5, and the rubber seal member 3
The resin sealing member 31 is pressed against the surface of the shaft 1 by a radial elastic force of No. 2 to slidably and sealingly contact.

That is, as a member on the sliding side with the shaft 1,
A resin seal member 31 having a small sliding resistance and high abrasion resistance is used, and a sealing function by a tension force cannot be obtained only with the resin seal seat 31. The seal member 32 is mounted.

In particular, in this embodiment, a recessed groove 34 is provided on the outer peripheral surface of the rubber seal member 32 in the circumferential direction, and the resin seal member 31 abuts on the shaft 1 which is a sliding member. When the tension is reduced.

The resin seal member 31 and the rubber seal member 32 are provided with a passage 38 for discharging the liquid to be sealed to the atmosphere.

That is, slits 33 extending in the radial direction are equally arranged radially on both end surfaces in the axial direction of the resin seal member 31, and the outer peripheral surface of the rubber seal member 32 is formed on the outer peripheral surface of the rubber seal member 32. Slits 35 extending in the axial direction are equally arranged in the circumferential direction. Further, on both end surfaces of the rubber seal member 32 in the axial direction, projections 36 that contact the groove wall surfaces of the annular groove 5 are arranged in the circumferential direction. Are arranged.

The resin sealing member 31 is in the shape of a square ring, and its axial length is longer than the length of the rubber sealing member 32 by the height of the columnar projections 36 provided on both end faces. . That is, both the resin seal member 31 and the rubber seal member 32 are set to have a length slightly smaller than the annular groove 5, and the length of the resin seal member 31 in the axial direction and the cylindrical shape provided on both end surfaces. The length of the rubber seal member 32 including the height of the projection 36 is substantially equal to the length of the rubber seal member 32.

Also, the depth of the undercut groove 34 provided along the circumferential direction on the outer peripheral surface of the rubber seal member 32 and the depth of the slit 35 provided along the axial direction are substantially equal.

As described above, the slits 33 provided on both side surfaces of the resin seal member 31 and the rubber seal member 32
The annular groove 5 is formed by cylindrical projections 36 provided on both end surfaces of the annular groove 5.
A gap formed between the groove wall and both end surfaces of the rubber seal member 32 and a slit 35 provided on the outer peripheral surface communicate with each other to communicate from the liquid side O to be sealed to the atmosphere side A. 38.

In the dust seal having the above structure, the resin seal member 31 is slidably and sealingly contacted with the outer periphery of the shaft 1.
In this sliding portion, intrusion of dust, water, and the like from the atmosphere side A to the liquid side O to be sealed is prevented, and the leakage of the liquid to be sealed from the liquid side O to the sealing side to the atmosphere side A is prevented. .

On the other hand, the outer peripheral side of the resin seal member 31 is sealed by a rubber seal member 32 mounted between the resin seal member 31 and the inner periphery of the housing 2. . That is, the inner periphery of the rubber seal member 32 is formed of a resin seal.
The rubber seal member 32 and the resin seal member 31 are sealed by making sealing contact with the outer periphery of the seal member 31. Further, the outer periphery of the rubber seal member 32 is in close contact with the bottom surface of the annular groove 5 so that the rubber seal member 31 and the bottom surface of the annular groove 5 are sealed.

When the dust seal 3 of this embodiment is used as a dust seal of a conventional continuous casting machine, FIG.
Instead of the oil seal shown in FIG.
Attach le 3 A lubricant such as grease for lubrication inside the bearing is injected, and the injected lubricant is constantly discharged from the inside of the bearing, which is the liquid side O to be sealed, to the atmosphere side A from the discharge passage 38 described above. As a result, lubrication of the bearing can be ensured.

Since the resin seal member 31 having low frictional resistance and high wear resistance is disposed on the sliding portion which comes into contact with the shaft 1, torque loss is small, wear is reduced, and long life is achieved. Can be achieved.

In particular, since the rubber seal member 32 is provided with a groove to reduce the pressing force against the resin seal member 31, the tightening force on the sliding portion of the resin seal member 31 is reduced, so that torque loss and torque loss are reduced. Wear can be reduced.

(Second Embodiment) FIG. 2 shows a sealing device according to a second embodiment of the present invention.

The second embodiment has the same configuration as the first embodiment, and only the differences will be described. In this second embodiment,
In the middle of the passage 38, a valve mechanism that closes the passage 38 when the pressure of the liquid to be sealed such as a lubricant becomes higher than the atmospheric pressure and the pressure difference is equal to or less than a predetermined pressure, and opens the passage when the pressure difference exceeds the predetermined pressure. It is provided.

That is, also in the second embodiment, the outer peripheral surface of the rubber seal member 32 is provided on the outer peripheral surface in the same manner as the first embodiment.
A plurality of slits 35 extending in the axial direction are equally arranged in the circumferential direction.

In the middle of the slit 35, FIG.
As shown in (b), a thin projection 37 having a triangular cross section is provided, and the height of the triangular projection 37 is set at the same position as the outer peripheral surface of the rubber seal member 32.
Therefore, the slit 35 is always kept closed. Then, when the liquid to be sealed on the bearing side expands in volume and generates a small pressure, the triangular projection 37 is distorted and the slit 35 is opened to function as a valve mechanism for discharging the liquid to be sealed.

Of course, the shape of the protrusion 37 is not limited to a triangular shape, but may be another sectional shape.

FIGS. 3A to 3C show various modifications of the passage configuration of the above embodiment. In each modification, only parts different from the first embodiment will be described, and the same components will be denoted by the same reference numerals and description thereof will be omitted.

FIG. 3 (a) shows that both ends of the resin seal member 31 abutting against the groove wall of the annular groove 5 and the rubber seal member 32 are not provided with protrusions or slits. The slits 33 and 39 are provided on the outer peripheral surface of the resin seal member 31 in which the inner periphery of the seal member 32 is in close contact.

FIG. 3 (b) shows a configuration in which a slit 40 extending in the axial direction is provided on the inner peripheral surface of a rubber seal member 32 which is in close contact with the outer periphery of a resin seal member 31.

When the slits 39 and 40 are provided on the contact surface between the resin seal member 31 and the rubber seal member 32 as shown in FIGS. Therefore, it is preferable to provide a non-slip surface between the contact surfaces, for example, with unevenness or a rough surface.

FIG. 3 (c) shows a projection 36 on both axial end surfaces of the rubber seal member 32 which abuts against the groove wall surface of the annular groove 5.
Instead, a radial slit 41 extending in the radial direction is provided.

In each of the above embodiments, the case where the lubricant of the bearing portion of the continuous casting machine is discharged as the liquid to be sealed has been described as an example. However, the present invention is not limited to the discharge of the lubricant, and is not limited to the discharge of the lubricant. It may be used for discharging the coolant. Further, the present invention is not limited to the sealing of the bearing portion for continuous casting. In short, it prevents dust and water from entering the inside of the apparatus from the atmosphere side, and prevents the liquid and the liquid inside the apparatus from entering.
For example, it can be widely used for discharging oil, water, various chemicals, and the like.

[0042]

The present invention has the above configuration and operation. The sealing device is a combination type of a resin seal member and an elastic seal member, and a resin seal member is provided on the mating sliding surface. The contact makes it possible to reduce the rotational torque loss, reduce wear, and provide a long-life sealing device.

In addition, by providing a passage for discharging a liquid to be sealed such as a lubricant to the atmosphere side, it is possible to prevent dust and water from entering the sealing sliding surface and at the same time to provide a protrusion provided in the passage.
Ki acts as a valve mechanism to convert the liquid to be sealed
It can be controlled and discharged by the pressure difference between the body side and the atmosphere side .

Further, if the elastic seal member is provided with a dullness for reducing the pressing force on the resin seal member,
The tightening force of the resin sealing member against the sliding portion can be reduced, the torque loss can be further reduced, and the life can be prolonged.

[Brief description of the drawings]

1 shows a sealing device according to a first embodiment of the present invention; FIG. 1 (a) is a perspective view, and FIG. 1 (b) is FIG.
1A is a cross-sectional view at the slit position, and FIG. 1C is a view as viewed in the direction of arrow C in FIG.

FIGS. 2A and 2B show a sealing device according to a second embodiment of the present invention. FIG. 2A is a perspective view, and FIG.
It is sectional drawing in the slit position of the sealing device of (a).

FIGS. 3A to 3C are cross-sectional views of a main part showing various modifications of a passage configuration.

FIG. 4 is a sectional view of a conventional sealing device.

[Explanation of symbols]

 B grease (lubricant) 1, 101 shaft 2, 102 housing 3 dust seal (sealing device main body) 5, 105 seal groove (annular groove) 31 resin seal member 32 rubber seal member 33 side slit 34 groove (thickness) 35 Slit on outer peripheral surface 36 Circular protrusion 37 Triangular protrusion 38 Passage 39, 40, 41 Slit

Continuation of the front page (56) References JP-A-60-84478 (JP, A) JP-A-3-79868 (JP, A) JP-A-4-44565 (JP, U) JP-A-4-114178 (JP , U) (58) Field surveyed (Int.Cl. ⁷ , DB name) F16J 15/16-15/30 F16C 33/76

Claims (2)

(57) [Scope of request for utility model registration] 1. A seal for sealing an annular gap between two rotating members which are mounted concentrically and relatively rotatably. An annular resin seal member and an elastic seal member made of rubber-like elastic material are combined. configured Te, both when mounting the elastic sealing member on the inner side of the annular groove provided in one of the two rotary members, and attaching the resin seal member to the open end side of the annular groove, the elastic seal The resin sealing member is pressed against the surface of the other rotating member by a resilient force of the member to make slidable sealing contact with the surface of the other rotating member, and further, the resin sealing member and the elastic sealing member mounted on the annular groove, A passage for discharging the liquid to be sealed to the atmosphere side is formed , and a sealing pair is formed in the middle of the passage formed in the elastic seal member.
When the pressure difference between the elephant liquid side and the atmosphere side exceeds a predetermined pressure, the passage
A sealing device comprising a projection serving as a valve mechanism for opening the valve . 2. The sealing device according to claim 1, wherein the elastic sealing member is provided with a recess for reducing a pressing force on the resin sealing member.