JPH089491Y2 - Integrated sealing device with sleeve - Google Patents

Description

TECHNICAL FIELD The present invention relates to a sealing device, and more particularly to an integrated sealing device with a sleeve for sealing a sealing fluid.

(Prior Art) Conventionally, as such a sealing device, there is a sealing device A as shown in FIG. The sealing device A is fixed to the housing 106. A rubber seal member 105 containing a metal ring 110 is arranged on the inner circumference of the housing 106. The seal member 105 has a seal end surface 102 protruding from the seal member 105.
Is provided. The seal member 105 is provided with a seal lip 116 and a dust lip 107. The seal lip 116 seals the sealing fluid, and the dust lip 107 prevents dust from entering from the outside.

On the other hand, a sleeve 108 with which the dust lip 107 and the seal lip 116 are in sliding contact is provided. A bake-molded sleeve member 100 is formed on the inner peripheral side of the sleeve 108.

As another conventional example, an integrated product that covers the opening between the seal member and the sleeve member (for example, USP 4,448,42
No. 6 bulletin) etc.

[Problems to be solved by the device]

However, the above-mentioned conventional technique has the following problems.

That is, according to the conventional sealing device, the sealing member 10
5 and the sleeve 100 are not integrated, the seal member 105
Since the sleeve and the sleeve 100 can be separated from each other, a gap is generated between the seal end surface 102 and the outer peripheral surface of the sleeve 108 due to looseness of the bearing or movement of the shaft portion to the right in FIG. Dust, muddy water, etc. easily enter the space of the interior 103, and the dust lip and the main lip are worn in a short time, resulting in a decrease in durability performance.

Further, since the gap between the seal end surface 104 and the outer peripheral surface of the sleeve 108 is opened, external dust, muddy water, etc. come directly to the site of the seal end surface 102, so that the sliding portion is worn in a short time and there is a gap and the sealing fluid However, there is a problem that the water will infiltrate inside.

Next, for the integrated product that covers the open part, the protective ring is completely fixed, so the shaft is eccentric, the shaft is eccentric during mounting, or the axial thrust causes rotation of the fixing member and rotation. The members come into contact with each other, and the rubber material is deteriorated due to overheating due to heat generation, resulting in a problem that the life is remarkably reduced.

Therefore, although the gap between the two members is set large, there is a problem that the sealability against dust and muddy water from the outside is insufficient because the gap is large.

The present invention has been made in view of the above-mentioned problems of the prior art. The purpose of the present invention is to improve the dust sealing property to remarkably improve the durability and to prevent deformation, damage, and excessive heat generation when the relative motion members come into contact with each other. Is to significantly improve durability.

(Means for Solving the Problem) The present invention having the above-mentioned object is to provide an outer peripheral cylindrical portion covered with an outer peripheral rubber portion made of a rubber elastic body and having a large diameter portion fitted into a housing, and the outer peripheral cylindrical portion. A metal ring having an end extending radially inward from one end, a seal member having a rubber elastic seal lip provided on the inner circumference of the end, and a shaft that makes relative movement with respect to the housing. An integrated sealing device with a sleeve, comprising: a lip sliding portion to be fitted; and a sleeve member that extends radially outward from an end portion side of the metal ring of the lip sliding portion to form a tip portion, It is supported by the outer peripheral rubber portion on the outer periphery on the end side of the outer peripheral cylindrical portion so as to be movable in the axial direction, and covers the end portion of the metal ring and the distal end portion of the sleeve member, and between the distal end portion of the sleeve member. A protective ring that forms a minute gap is provided An annular groove is provided on the outer peripheral rubber portion, an arcuate portion provided on the inner periphery of the protective ring is engaged with the annular groove, and the annular groove has a width that allows axial movement of the arcuate portion. By having it, it is possible to axially move and swing the protection ring even after the protection ring is engaged with the annular groove.

(Operation) Thus, according to the sealing device of the present invention, one end is fitted on the seal member on the outer peripheral inner cylindrical portion formed in the step of the metal ring, and the other end is the flange of the lip and the sleeve member. Since a protective ring formed so that there is a slight gap at the end covers the opening between the seal member and the sleeve to the outside air, it is possible to prevent external dust, muddy water, etc. from splashing, and to prevent dust. The property is improved. In addition, a slight gap between the inner end of the protective ring, the outer end of the sleeve, and the lip has a function as a labyrinth seal and improves dust resistance.

Further, depending on the mounting state of the protective ring, the protective metal ring is adjusted so as to swing in the radial direction between the rotating member and the fixed member and move in the thrust direction so as not to wear due to excessive load.

(Embodiment) Hereinafter, the present invention will be described based on an illustrated embodiment.

 FIG. 1 shows an overall view A of the sealing device of the present invention.

The sealing device A has a metal ring 1. The metal ring 1 has a cylindrical shape, is formed in a step shape, has a large diameter portion 2 and a small diameter portion 3, has a side surface portion 4 extending in the radial direction, and is further curved from the side surface portion 4. It has a bent portion 5. Metal ring 1
A rubber elastic body is formed by baking on the inner and outer peripheral parts, and a rubber part 7 fitted to the mating housing on the outer diameter part,
It has a concave portion 9 and a convex portion 10 as annular grooves for fixing a protective ring 22 described later. Further, it has an annular projection 11 along the side surface 4 of the metal ring 1, a dust lip 12 for preventing dust from entering from the outside, and a seal lip 13 for sealing a sealing fluid.
The seal lip 13 has a garter spring 14 on the outer peripheral side for pressing the seal lip 13 against the shaft 51. Sleeve 30 with which seal lip 13 and dust lip 12 slide
Has a lip sliding portion 31 and an annular convex portion 15, and has a tip portion 16 extending from the annular convex portion 15 in the radial direction. A rubber member 17 that is fitted to the mating shaft is baked on the inner periphery of the sleeve 30. The rubber member 17 has a guide taper 18, and the guide taper 18 allows the sealing device A to be installed at a predetermined location. It is formed to guide when attaching to. Further, a concave portion 21 and a lip portion 20 adjacent to the concave portion 21 are formed on the outer end surface of the rubber member 17.

In addition, the tip portion 16 of the sleeve 30 is continuous with the lip portion 20.
A flange end 19 is formed so as to cover it.

On the other hand, a protective ring 22 is provided on the outer periphery of the concave portion 9 and the convex portion 10 of the rubber portion 7.
Are fitted.

The outer end portion (arcuate portion) 27 of the protection ring 22 is curved and has a convex portion.
The curved portion 22a extending in the radial direction so as to surround 10 and the end surface portion 2
3 and further has an extension portion 24 extending axially from the end face portion 23. From the extension 24, the flange end 19 and the stepped lip 20 have a bent end 25 close to the stepped lip 20 with a slight clearance, the end 25 formed to cover the flange end 19. Has been done.

Thus, the protective ring 22 is attached to the concave portion 9 and the convex portion 10 by the outer end portion 27 so as to be movable in the axial direction, and further, the flange end 19 has a slight clearance on the stepped lip 20. It has a bent end 25. Therefore, when a load is applied to the protection ring 22 in the radial direction and the axial direction, the protection ring 22 can swing.

Also, a labyrinth is formed between the extension 24, the end 25, the flange end 19 and the lip 20 of the protective ring 22.

The mounting state of the sealing device A having such a structure is shown in FIG. As can be seen from this figure, the sealing device A is attached to the housing 50.
The protective ring 22 is press-fitted, then the shaft 51 is inserted along the inner diameter of the inner race 52 of the bearing, and is press-fitted to the inner circumference of the sleeve member 17. With such a configuration, the housing 50
Alternatively, either of the shafts 51 may rotate. As described above, in the unitized seal type sealing device in which the sleeve member 17 and the seal member are integrated, it is not necessary to manage the surface condition of the shaft 51 that influences the sealing property of the seal, and the mounting is easy. In particular, since the inner and outer peripheral rubber elastic bodies are fitted to the housing 50 and the shaft 51, it is possible to assemble by hand crimping without using a jig or press. Further, the seal lip 13 is protected by the sleeve 31, and it is possible to prevent the lip damage harmful to the sealing property, the adhesion of dust foreign matter, and the deterioration of the state of the grease applied in advance.

On the other hand, the protective ring 22 on the rubber surface of the outer peripheral concave portion 9 of the rubber portion 7
Since the fixing is performed at two points, that is, the fixing by the outer end portion 27 of the rubber portion and the fixing of the convex portion 10 of the rubber portion 7 which is relatively thick, Or, when a thrust direction movement occurs and an unreasonable load is applied to the two members that are relatively rotating, the protective ring 22 swings in the radial direction,
It moves in the thrust direction and acts to adjust so that friction does not occur due to excessive load or deformation / damage due to contact does not occur.

This will be described with reference to the drawings. FIG. 3 (a) shows the state in which the swing adjustment can be performed by the contact with the flange end 19 and the force F _r, and FIG. 3 (b) shows the state in which the swing can be adjusted by the contact with the flange end 19 and the force F _s. Show.

(Effect of the Invention) According to the present invention, one end is fitted on the seal member on the outer peripheral inner cylinder formed in a stepped shape of the metal ring, and the other end is provided with the protective ring having a slight gap in the lip. Since the opening between the seal member and the sleeve member to the outside air is covered, it is possible to prevent external dust, muddy water, and the like from splashing, and the dust resistance is significantly improved.

Further, the extension portion, the end portion, the flange end and the lip portion of the protective ring have a function as a labyrinth seal to further improve the dust resistance and the interference resistance between both members can be minimized.

Further, since the protective ring is supported by the outer peripheral rubber part, it is elastically supported, and the annular groove has a width that allows the arcuate part to move in the axial direction. Therefore, even if eccentricity occurs between the shaft and the housing, it can be dealt with. When swinging, the portion that engages with the annular groove is an arcuate portion, and it is easy to maintain the engaged state.

Furthermore, the movement of the arcuate portion is restricted at the end of the annular groove, and the protective ring does not come off from the outer peripheral rubber portion, so that it does not come off. As a result, the seal member and the sleeve member can be reliably integrated. Further, it is possible to give the protection ring a degree of freedom in the radial direction and the axial direction.

In other words, when the shaft eccentricity, the mounting eccentricity between the shaft and the housing, or the movement in the thrust direction occurs and an unreasonable load is applied to the two members that are relatively rotating, the protective ring swings in the radial direction or thrust. It moves in the direction of pulling out in order to prevent friction due to excessive load, or deformation or contact
It acts as a control to prevent damage. Therefore, there is an effect that deformation / damage due to sliding / contact of the two members, excessive heat generation can be prevented, and long-term sealing performance can be obtained.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of the sealing device of the present invention, FIG. 2 is a vertical sectional view showing a mounting state of the sealing device of the present invention, FIG. 3 is an operation explanatory diagram, and (a) is a force F. FIG. 4 is an operation explanatory view of the protective ring when _r is applied, (b) is an operational explanatory view of the protective ring when a force F _s is applied, and FIG. 4 is a vertical cross-sectional view of a conventional sealing device. Explanation of symbols A ... Sealing device, 1 ... Metal ring 2 ... Large diameter part, 3 ... Small diameter part, 4 ... Side part, 5 ... Bending part, 7 ... Rubber part, 9 ... Recessed part ... Convex part, 11 …… Annular protrusion 12 …… Dustrip, 13 …… Seal lip 14 …… Garter spring, 15 …… Annular convex part 16 …… Tip part, 17 …… Rubber member 18 …… Guide taper, 19… … Flange end 20 …… Lip, 21 …… Concave 22 …… Protective ring

Claims (1)

[Scope of utility model registration request] 1. An outer peripheral cylindrical portion covered with an outer peripheral rubber portion made of a rubber elastic body and having a large diameter portion fitted into a housing, and an end portion extending inward in a radial direction from one end of the outer peripheral cylindrical portion. A seal member including a metal ring and a rubber elastic seal lip provided on the inner circumference of the end, a lip sliding portion fitted to a shaft that makes relative movement with respect to the housing, and the lip. An integrated sealing device with a sleeve, comprising: a sleeve member that extends radially outward from the end side of the metal ring of the sliding portion to form a tip, the outer periphery of the outer periphery of the outer peripheral cylindrical portion on the end side. A protective ring, which is movably supported in the axial direction by a rubber portion, covers the end of the metal ring and the tip of the sleeve member, and forms a minute gap between the tip of the sleeve and the outer periphery. An annular groove is provided in the rubber part, and the annular groove is After engaging the arcuate portion provided on the inner circumference of the protective ring, and the annular groove having a width that allows the arcuate portion to move in the axial direction, after the protective ring engages with the annular groove. Also in the above, an integrated sealing device with a sleeve capable of axially moving and swinging the protection ring.