JP2003083346A - Seal device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a seal device having good seal performance even in an inferior environment. SOLUTION: In this seal device for a sealed bearing, comprising an outer ring having an outer ring track in an internal peripheral surface, an inner ring having an inner ring track in an external peripheral surface, a plurality of rolling units provided to freely roll between the outer/inner ring tracks, and a seal device closing an axially opening part of a space providing the rolling unit between an internal peripheral surface of the outer ring and an external peripheral surface of the inner ring, the seal device is characterized by having a core metal, a seal consisting of elastic material to be formed with a lip, and a slinger coming into slide contact with at least the lip, in the seal device, further with Vickers hardness (Hv) of 500 or more in a part coming into slide contact with at least the lip of the slinger.

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automobile, for example.
Rolling bearings for wheels used to support wheels, water cooling for automobiles
Supports the rotation axis of the water pump used for engines, etc.
To prevent leakage of encapsulated grease like bearings
Both are in the bearing of dust, water, steam, mud, etc. from outside
Shaft with sealing device to prevent intrusion into parts
The present invention relates to a receiving seal device. 2. Description of the Related Art For example, for wheels supporting automobile wheels
Rolling bearings are exposed to wind, rain, car wash water, dust, etc.
Conventionally, for example, a sealing structure as shown in FIG.
Has been adopted. Fixed in the illustrated rolling bearing O
The outer ring-equivalent member 1 as a ring is mounted on the outer peripheral surface thereof.
The part 2 supports and is fixed to a suspension device (not shown).
Therefore, the outer ring equivalent member 1 does not rotate during use.
Inside such an outer ring equivalent member 1 is an inner wheel phase which is a rotating wheel.
This member 3 is provided concentrically with the outer ring equivalent member 1 and is used when
This inner ring-equivalent member 3 rotates. This inner ring equivalent member 3
Comprises a hub 4 and an inner ring 5. Of these hubs 4
A spline groove 6 is provided on the outer surface.
The outer end in the width direction is referred to as the left end in FIG.
Each has a mounting flange 7 formed therein. To the vehicle
At the time of assembling, the spline groove 6 has a constant velocity joint
The drive shaft that is driven to rotate via the
Wheels are fixed to the flange 7. The outer peripheral member 1 has a double-row
The ring raceways 8, 8 are formed by the outer peripheral surface of the intermediate portion of the hub 4 and the inner race.
Inner ring tracks 9 and 9 are formed on the outer peripheral surface of
ing. Each of these outer raceways 8, 8 and the inner raceway
Rolling elements 10 and 10 are provided between the outer ring phases
The inner ring-equivalent member 3 can be freely rotated inside the member 1
I have. Further, the rolling elements 10 and 10 are rotatably held.
For this purpose, retainers 11, 11 are provided. In addition, the illustration
In the example, balls are used as the rolling elements 10 and 10,
In the case of a hub unit for a large vehicle, the rolling element
In some cases, a tapered roller is used. Furthermore, the outer race
Between the outer end of the member 1 and the outer peripheral surface of the intermediate portion of the hub 4
Is provided with sealing devices 12a and 12b,
Between the inner peripheral surface of the member 1 and the outer peripheral surface of the inner ring equivalent member 3
Outside of the space 13 where the rolling elements 10 and 10 are installed.
The end opening is closed. FIG. 2 is an enlarged view of the sealing device 12a.
So that the metal core 105, the slinger 106, and the elastic portion
And material 107. The core 105 of these is
Punching process such as press working on metal plate such as low carbon steel plate
In addition, they are integrally formed by plastic working. This
Is equivalent to the outer ring constituting the rolling bearing O.
Outer diameter side cylindrical portion 10 which can be fitted and fixed on the inner peripheral surface of the end of member 1
9 and the inner edge in the axial direction of the outer diameter side cylindrical portion 109 (see FIG. 2).
Inner ring part 1 bent inward in the diameter direction from the left edge)
10 and is formed in an annular shape with a substantially L-shaped cross section.
You. Further, the slinger 106 is made of a stainless steel plate or the like.
For metal plates with excellent corrosion resistance,
Punched and plastically processed to form
Have been. Such a slinger 106 is provided with the above-mentioned rolling bearing.
O which can be externally fitted and fixed to the outer peripheral surface of the outer end of the inner ring 5 constituting O
Radial-side cylindrical portion 112 and axial direction of this radial-side cylindrical portion 112
Bent diametrically outward from the outer edge (right edge in FIG. 2)
With an outer annular portion 113, which is annular in an L-shaped cross section.
Is formed. The elastic member 107 is made of rubber or elastic material.
It is made of an elastic material such as a tomer.
The seal lip 114, 115, 116
The base end is fixedly connected to the gold 105. And
The leading edge of the outermost outer seal lip 114
Inside of outer ring portion 113 constituting slinger 106
Surface, and the middle seal, the remaining two seal lips
Tip edges of lulip 115 and inner seal lip 116
To the inner diameter side cylindrical portion 112 constituting the slinger 106.
Grease leakage due to sliding contact with the outer peripheral surface of
To prevent dust, water, muddy water, etc. from outside
Prevents intrusion into the receiver. FIG. 3 is an enlarged view of the sealing device 12b.
Core bars 216 each formed in an annular shape so that
And an elastic member 217. Core 2 of these
An outer end 16 of the outer ring equivalent member 1 is made of a metal plate.
It is fixed inside the part. The elastic member 217 is
The core 2 is made of an elastic material such as rubber or elastomer.
16 and fixed by bonding or the like. Also,
The elastic member 217 has an outer diameter side, an inner diameter side, and two side faces.
Seal lips 218, 219 and one radial seal
And a lip 220. Then, the above two side panels
Lip 218, 219 at the leading edge (left edge in FIG. 3)
Toward the diametrical direction (upward in FIG. 3)
By inclining, a function to prevent foreign matter from entering the space 13
Is secured. The radial seal lip 22
0 toward the leading edge (lower right edge in FIG. 3).
By tilting it toward the inside (right side of FIG. 3).
The grease leakage prevention function is secured. More specifically, the sealing device 12b
Is a core metal 216 and an elastic portion, each of which is formed in a ring shape.
217. Core of sealing device 12b
The gold 216 is formed by pressing a metal plate such as a low carbon steel plate by pressing.
By performing punching and plastic working,
Have been. This core metal 216 constitutes the rolling bearing O.
An outer diameter side circle which can be fitted and fixed on the inner peripheral surface of the end of the outer ring equivalent member 1.
The cylindrical portion 222 and the outer edge of the outer diameter side cylindrical portion 222 (FIG. 3)
Support plate 2 bent inward in the diametric direction from the left edge of the
23. The outer cylindrical portion 222 of the inner
The large-diameter portion 224 near the end (rightward in FIG. 3) and the elastic member 21
7, the outside of the support plate portion 223 constituting the metal core 216
This elastic member covers the entire side surface (the left side surface in FIG. 3).
217 is continuous from the fitting cylinder 222.
Outer peripheral surface of inclined portion 227 and inner periphery of open end of outer ring equivalent member 1
It is sandwiched between surfaces. And with this configuration,
The fitting portion between the core metal 216 and the outer ring equivalent member 1 is sealed.
You. The outer diameter of the large diameter portion 224 in a free state.
Is slightly larger than the inner diameter of the outer end opening of the outer ring equivalent member 1.
The large-diameter portion 224 is an outer ring equivalent portion.
The inner end of the material 1 can be fixed inside by an interference fit.
ing. The support plate portion 223 has a substantially S-shaped cross section.
It has a shape, and the more it goes inward in the diametric direction (downward in FIG. 3),
Direction approaching the rolling elements 10 and 10 installed in the space 13 (FIG.
3 to the right). On the other hand, together with the core 216, the sealing device
The elastic member 217 constituting the arrangement 12b is
Insert molded into and fixed by bonding etc.
ing. The outer peripheral edge of such an elastic member 217 is inclined as described above.
The outer peripheral surface of the portion 227 is covered. Also, such an elastic part
Part that covers the outer peripheral surface of the inclined part 227 with a part of the material 217
In the free state, the outer diameter of the outer ring equivalent member 1 is
It is set slightly larger than the inner diameter of the mouth,
In a state where the portion 224 is internally fitted and fixed to the outer end opening,
A part of the elastic member 217 covers the outer peripheral surface of the inclined portion 227.
Is the outer peripheral surface of the inclined portion 227 and the outer end opening.
It is elastically pressed between the inner peripheral surface of the mouth and
To ensure good security. Further, the base 226 of the elastic member 217
The outer surface (the left side surface in FIG. 3) of the support plate portion 223 is
It is completely covered all around. In addition, the base 226
Outer side, inner side, two sides
Seal lips 218, 219 and one radial seal
A lip 220 is formed, and two side seams are formed.
Rip 218, 219 at the leading edge (left edge in FIG. 3)
As it moves, it tilts in the direction toward diametrically outward (upward in FIG. 3).
By tilting, the function to prevent foreign matter from entering the space 13
Have secured. The radial seal lip 220
Of the space 13 toward the leading edge (lower right edge in FIG. 3).
By inclining in the direction toward the inside (right side in FIG. 3)
The grease leakage prevention function is secured. FIG. 4 shows a water pump of an automobile.
As an example, the water pump 50 is generally
The rotating shaft 52 to which the stud 51 is fixed is spaced apart in the axial direction.
Of the casing 5 by the plurality of rolling bearings 55
6. Cooling water is supplied to impeller 51
The mechanical seal 57 arranged between the bearing 55
Sealed. The rotating shaft 51 is directly connected to the pulley 58.
And rotate with the rotation of the engine. Here, the rotating shaft 5 of the mechanical seal 57
2 is in a lubricated condition with water,
Steam or the like leaks into the rolling bearing 55 side, and the rolling bearing 55
55 grease is deteriorated. So, steam
Prevents intrusion of grease and leakage of sealed grease
Rubber bearings on the impeller 51 side of the rolling bearing 55
A rule device is provided. The pulley of the rolling bearing 55
The 31 side also prevents dust from entering from outside and
A rubber seal device is used to prevent leakage of encapsulated grease.
Is provided. FIG. 5 is a side view of the rolling bearing 55 on the impeller 51 side.
FIG. 3 is an axial sectional view showing the structure of FIG. As shown,
The rolling bearing 55 is composed of an outer ring 55a and a rotation forming an inner ring.
The shaft 59 is sandwiched between the outer ring 55a and the rotating shaft 59.
Ball 55b and retainer 55c for holding ball 55b
Consists of The sealing device 60 includes a sealing plate 61 and a slinger 6.
5 Seal groove 5 at both axial ends of outer ring 55a
One end of the seal body 62 is fixed to 5d. Ma
The sealing plate 61 has a core metal (reinforcing member) 61 having an inverted L-shaped cross section.
a and a seal body 62 made of an elastic material such as rubber.
Become. As shown in the figure, the seal main body 62
The main side is divided into two forks on the 9 side, forming one of them.
The tap portion 62a extends diagonally to the lower right and forms the other side.
The sub lip portion 62b extends obliquely to the lower left. Also,
At an intermediate position of the core 61a, the seal body 62
A third cylindrical lip portion 6 extending to the middle right
2c is formed. The rotating shaft 59 is made of stainless steel.
Are disposed. Slinger 65
A small cylinder 65c that is tightly fitted to the rotation shaft 59 and is coaxial
The large cylinder 65a contained in the
And a flange portion 65b. And seal
The third lip portion 62c of the main body 62 is a large cylinder of the slinger 65.
65a, the main lip portion 62a is in contact with the outer periphery of the small cylinder 65a.
c, and the auxiliary lip portion 62b is
It comes into contact with the peripheral surface to achieve a sealed structure. In the sealing device 60, cooling from outside
If steam or water droplets are splashing,
65 receives this on the outer peripheral surface, and the cooling water is directly supplied to the sealing plate 61.
It does not get off. This allows the sealing plate
61 (especially, the third lip member 62c) is reduced in deformation and expansion.
Can be reduced. On the other hand, it is sealed in the rolling bearing 55
The grease or the like is applied to the sub lip 62b of the sealing plate 61 and the main lip.
Sealed by lip 62a to prevent leakage to the outside
It is supposed to be. [0015] The above-mentioned wheel axle
The receiving seal device 12a is less likely to be splashed with water,
Grease in a relatively clean environment with little dust
It shows sufficient sealing performance even under lubrication. But Zhou
As you know, automotive wheel bearings are used outdoors,
Is exposed to a large amount of dust, and rainwater, car wash water,
Inhibitors or worst case immersed in muddy water
In such poor conditions.
In some cases, an inadequate sealing performance may not be obtained. Especially recently,
Vehicles for extending the life of wheel bearings and improving fuel efficiency of automobiles
While lower torque is required for wheel bearings,
In bad environments, in extreme cases, lip 114 and slinger 1
Grease in the sliding contact area with 06 softened and emulsified,
The lubrication occurs and lubrication cannot be maintained sufficiently. The slinger 114 has corrosion resistance.
It is generally formed of stainless steel material,
Stainless steel is a soft material, so hard dust
When entering the sliding contact portion, the lip 11
Not only No. 4, but also the slinger 106
It will help you. And the slinger 106 which is originally smooth
The surface of the lip 114 is worn due to wear and surface roughness.
Wear is further promoted, and the sealing performance of the sealing device 12a is improved early.
descend. Also, the water pump seal device 60
The same thing happens. That is, the sealing device 6
0 indicates that the mechanical seal 57 functions effectively and the cooling water
Good seal when no vapors or droplets enter the bearing
Show performance. However, when the temperature exceeds the mechanical seal 57,
When the inundation water enters, the third lip portion 62 of the seal body 62
The grease in the sliding part between c and slinger 65 softens and emulsifies
Causes grease to run out and added to cooling water
Silicates, etc., are used to remove water or glycols as solvents.
The third lip portion 6 is precipitated by volatilization and becomes hard particles.
2c and the slinger 65 are polished. As a result, the sealing device
The sealability of 60 decreases early. In such a sliding contact portion between the lip and the slinger,
Increase the interference in order to suppress the deterioration of sealing performance due to
However, the torque increases,
The seal may be deteriorated due to wear of the pump.
Increases the frictional heat, causing the grease to deteriorate,
The service life may be shortened. As described above, the conventional sealing device is
Under severe operating conditions as described above, and dust and hard particles
In environments where abrasive particles are present, sufficient sealing performance cannot be obtained.
Not necessarily. Therefore, the present invention provides such an inferiority.
To provide a sealing device having good sealing performance even in a bad environment
The porpose is to do. [0020] To achieve the above object,
For example, the present invention provides an outer race having an outer raceway on an inner peripheral surface,
An inner race having an inner raceway on a peripheral surface, the outer raceway and the inner raceway;
A plurality of rolling elements provided to be able to roll between wheel raceways
Between the inner peripheral surface of the outer race and the outer peripheral surface of the inner race.
A sealing device for closing an axial opening of a space provided with rolling elements;
A sealing device for a sealed bearing comprising:
The lip is made of an elastic material
And at least a slinger that is in sliding contact with the lip.
And has a sliding contact with at least the lip of the slinger.
Part to be Vickers hardness (Hv) is 500 or more
A sealing device is provided. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail.
I do. In the present invention, the configuration itself of the sealing device
Is a sealing part comprising a metal core and a lip made of an elastic material.
And a slinger that slides into contact with the lip
It is not limited, but the so-called sealing device with slinger
General can be targeted. Of course, as shown in FIGS.
Such a sealing device may be used. The material of the slinger is not particularly limited.
Examples include cold rolled steel sheets such as SPCC and stainless steel sheets.
However, a stainless steel plate is preferable in terms of corrosion resistance. Departure
At least the lip and slide of this slinger
Make the contacting part 500 or more in Vickers hardness (Hv)
You. Vickers hardness (Hv) is set to 500 or more.
There is no particular limitation on the method of
Hard metal plating such as metal and electroless nickel plating, silicon nitride
Ceramic coating such as silicon, TiN, TiC, Ti
CN, SiC, TiAlN, Al _Two O _Three , TiAl _Two N,
Diamond, DLC, cBN, CrN, ZrN, Hf
Method of forming a film such as N by PVD method or CVD method
Is possible. In addition, depending on the type of steel,
Partial hardening heat treatment such as charcoal, carbonitriding and nitriding may be performed.
No. Among these hardening treatments, carburizing, carbonitriding, nitriding
Heat treatment such as hardening, hard metal plating film, PVD
Slinger shaft or shaft equivalent member, such as film and CVD film
The slinger deforms when mated with
There is no danger of abrading the lip
It is preferable because the production cost is low. The method of the partial curing heat treatment is not particularly limited.
Instead of the conventionally known gas nitriding, gas carburizing, gas
Carbonitriding, vacuum ion carburizing, salt bath nitriding (taftride method
And plasma nitriding. However, nitriding
In the case of
Of passivation film mainly composed of chromium oxide
Before nitriding, it is reduced and removed with active hydrogen gas.
Or by pickling with concentrated nitric acid
Perform gas nitriding by removing more oxides, or plasma nitriding
Is adopted. A more preferred nitriding method is disclosed in
It is possible to use the method described in US Pat.
it can. Here, first, the surface of the stainless steel plate was nitrided.
Prior to forming the layer, a fluorine compound or fluorine
To purify the surface by heating and holding in a gas atmosphere containing
The reaction between the surface oxide film of stainless steel and fluorine
To form a fluoride film and protect it with this fluoride film
In this state, fluoride is decomposed by nitriding to erase the film.
And thereby activate the surface of the stainless steel plate
You. Next, this activity is performed by performing a normal nitriding treatment.
Nitrogen atoms easily penetrate, diffuse and homogenize the surface
A nitride layer is formed. Further, an austenitic stainless steel plate is used.
When used, it is described in Japanese Patent No. 3005952.
As mentioned, prior to carburizing,
Austenitic stainless steel plate is heated and held under ambient atmosphere
And then carburizing at a lower temperature than usual
This is preferable because the reduction in corrosion resistance due to charcoal can be suppressed. The thickness of the hard film obtained by the above hardening treatment
The layer thickness (depth) of the hard layer is not particularly limited.
However, in any case, the range is 0.2 to 50 μm.
Is preferred. When the hard film or hard layer is less than 0.2 μm
Can not expect sufficient wear resistance over a long period of time
Rather, technically, such thin films and layers are formed uniformly.
It is difficult to do. On the other hand, a hard film or a hard layer
If it exceeds, it is excessive in general use and hard
In addition to the long time required for the quality treatment,
When fitting the slinger to the shaft or shaft equivalent
And hard layers are easily deformed, damaged and peeled off,
The risk of abrasion of the lip, which is a hand material, is also increased. The upper limit of the Vickers hardness (Hv) is limited.
It is not abrasion resistance if it is less than 2000
No significant difference is observed. Effect of the above hardening treatment
When fitting slingers to shafts or shaft equivalents
Considering the ease of mating, etc., Vickers hardness (H
The upper limit of v) is suitably about 1000. On the other hand, a lip and a seal member are formed.
The elastic material is formed from a rubber composition. Base
As the rubber, for example, styrene butadiene rubber, pig
Diene rubber, isoprene rubber, butyl rubber, halogenated
Butyl rubber, acrylonitrile butadiene rubber, chloro
Prene rubber, ethylene / propylene rubber, chlorosulfo
Polyethylene rubber, acrylic rubber, epichlorohydrin
Examples include phosphorus rubber, fluorine rubber, silicone rubber, etc.
You. Hydrogenated rubbers obtained by hydrogenating these rubbers (for example,
For example, hydrogenated nitrile rubber) or modified with carboxyl groups
Modified rubber (eg, carboxylated acrylonitrile)
Rubutadiene rubber, carboxylated styrene butadiene
Rubber) can also be used. These rubbers are a mixture of two or more
It can also be used. [0031] Among the above rubbers, there is an influence of grease and the like.
Acrylonitrile butadiene is a difficult oil resistant rubber
Rubber, acrylic rubber, fluorine rubber, silicone rubber, hydrogen
Nitrile rubber, carboxylated acrylonitrile pig
Diene rubber and the like are preferred. Various additives are compounded in the rubber composition.
It may be. The additives are not particularly limited.
What is used can be used. For example, carbon
Rack, silica, clay, talc, mica, diatomaceous earth, cork
Orastonite, aluminum oxide, zinc oxide, potassium carbonate
Lucium, magnesium carbonate, aluminum hydroxide, water
Magnesium oxide, aluminum sulfate, barium sulfate,
Calcium sulfate, silicon carbide, graphite, glass powder
Powder, carbon powder, glass fiber, aramid fiber, boron
Examples of fiber, bentonite, shirasu, cellulose powder, etc.
Can be shown. Above all, the reinforcing property to rubber is large, and
Carbon black, which is a water-repellent filler, is preferred. [0033] Two or more fillers should be used as a mixture.
And the amount is based on 100 parts by weight of the base rubber.
The amount is usually in the range of 5 to 200 parts by weight. Additive
If the amount is less than 5 parts by weight, a sufficient reinforcing effect cannot be obtained,
Even more than 200 parts by weight, further improvement of reinforcement
Not recognizable, but extremely deteriorated in moldability
In addition to the fact that it is substantially difficult to manufacture,
It becomes too elongate and the elongation is small, and the inherent rubber elasticity
Will drop. Further, a vulcanizing agent for molding is added to the rubber composition.
Is blended. Vulcanizing agents include sulfur, zinc oxide, and oxidized
Magnesium, sulfur-containing organic compound, dithiocarbamic acid
Salt, oxime vulcanizing agent, quinoid vulcanizing agent, nitrosation
Compounds, peroxide-based vulcanizing agents, organic peroxide-based vulcanizing agents,
Vulcanizing agent, ammonium benzoate, isocyanurate
Examples of acids, metal soaps, resin vulcanizing agents, etc.
Use according to. The amount of the vulcanizing agent is usually
0.1 to 10 parts by weight based on 100 parts by weight of base rubber
You. The rubber composition may be vulcanized together with a vulcanizing agent.
Auxiliaries, activators, vulcanization accelerators and the like may be blended. Vulcanization aid
As an agent and activator, for example, zinc oxide, magnesium oxide
, Lead monoxide, lead tetroxide, zinc carbonate, basic carbonate
Organic acids such as lead, calcium hydroxide, stearic acid,
And glycols. These vulcanization aids,
Activators may be used as a mixture of two or more, and are usually used as a base.
0.1 to 10 parts by weight per 100 parts by weight of rubber
You. As a vulcanization accelerator, for example, guanidine compounds,
Aldehyde-ammonia compound, aldehyde-amine
Compounds, thiazole compounds, thiourea compounds,
Sulfenamide compounds, thiuram compounds, dithio
Examples of carbamate compounds, xanthate compounds, etc.
Can be used alone or in combination of two or more.
Can be used. In addition, crosslinking is performed with an organic peroxide-based vulcanizing agent.
Auxiliaries (coagents) can also be used. Cross-linking aid
Examples of agents include tetrahydrofurfuryl methacrylate
G, ethylene dimethacrylate, 1,3-butylene dimetha
Acrylate, 1,4-methylene dimethacrylate, 1,
6-hexanediol dimethacrylate, polyethylene
Glycol dimethacrylate, 1,4-butanediol
Diacrylate, 1,6-hexanediol diacryle
2,2'-bis (4-methacryloxydiethoxy)
Phenyl) propane, 2,2′-bis (4-acryloxy)
Sidiethoxyphenyl) propane, trimethylolpro
Pan triacrylate, trimethylol propane trim
Tacrylate, pentaerythritol triac relay
G, 3-chloro-2-hydroxypropyl methacrylate
, Oligoester acrylate, aluminum (meth
TA) acrylate, zinc (meth) acrylate, mug
Nesium (meth) acrylate, calcium (meth) a
Acrylate, triallyl isocyanurate, triallyl
Cyanurate, triallyl trimellitate, diallylph
Tallate, diallylchlorendate, divinylbenze
, 2-vinylpyridine, N, N'-methylenebisac
Lilamide, p-quinonedioxime, p, p'-diben
Zoylquinone dioxime, 1,2-polybutadiene, etc.
No. The amount of these crosslinking aids is usually based on
It is 1 to 10 parts by weight based on 100 parts by weight of rubber. Further, the rubber composition prevents oxidative deterioration.
For this purpose, an antioxidant may be added. As an anti-aging agent
Are, for example, amine-ketone condensation products, aromatic secondary
Amines, monophenol derivatives, bis or polypheno
Phenol derivatives, hydroquinone derivatives, sulfur-based antioxidants,
And a phosphorus-based antioxidant. Of these, amines
2,2,4-trimethyl-1,2 of ketone condensation product system
-Dihydroquinoline polymer diphenylamine and aceto
Condensation products with aromatic secondary amine N, N'-
Di-β-naphthyl-p-phenylenediamine, 4,4 ′
-Bis- (α, α-dimethylbenzyl) diphenylamido
, N-phenyl-N '-(3-methacryloyloxy
-2-hydroxypropyl) -p-phenylenediamine
Etc. can be exemplified. In addition, thermal decomposition is prevented to improve heat resistance.
Therefore, a secondary antioxidant is used together with the above antioxidant.
Is more preferable. Examples of secondary aging inhibitors
For example, sulfur-based 2-mercaptobenzimidazole, 2
-Mercaptomethylbenzimidazole and its sub-
Lead salts and the like can be exemplified. In addition, the effects of sunlight or ozone
As a sun crack inhibitor to suppress cracks caused by
Waxes of about 55 to 70 ° C. and 100 weights of base rubber
About 0.5 to 10 parts by weight per part may be added. It is necessary to further improve the moldability.
In some cases, in addition to the above additives, as a processing aid
A plasticizer is appropriately added. However, there is no particular problem with molding.
If not, it is not necessary to add it. When adding
3 to 40 parts by weight based on 100 parts by weight of base rubber,
If added more than necessary, the rubber composition softens at the same time
Bleed-out without complete mixing and sealing
Adhesion between the core metal and the elastic member
You. Specific examples of the plasticizer include dioctyl phthalate and the like.
Phthalic acid diester, polyester plasticizer, polyether
-Tel plasticizer, polyetherester plasticizer, liquid
Nitrile rubber and the like can be mentioned. In terms of physical properties, the hardness of the rubber composition
Is affected by the amount of the various fillers listed above, etc.
However, when applied to sealing devices for rolling bearings for wheels
Because of the tightness and followability of
Pulling hardness A scale, preferably in the range of 50 to 90
No. If the hardness is less than 50, the friction of the sealing device
Abrasion resistance decreases with increasing resistance. Also,
When the hardness exceeds 90, the rubber elasticity is low as described above.
The sealing performance and followability of the lip of the sealing device
In a dusty environment or muddy water
Doing so may shorten the life of the rolling bearing.
You. A rubber composition was obtained using each of the above components.
Although there is no particular limitation on the method for adding
Additive and rubber kneading roll, pressure kneader, Banbury
Using a conventionally known rubber kneading device such as a mixer,
It is possible to knead them all at once. Kneading conditions are particularly limited
Although not specified, usually at a temperature of 30 to 150 ° C., 5 to 6
By kneading for 0 minutes, sufficient amounts of various additives can be obtained.
You can measure the scatter. Further, the above rubber composition is elastically sealed with a sealing device.
Although the method for forming the member is not particularly limited, it is not vulcanized.
What is necessary is just to heat the rubber composition while pressing it in a mold,
Known molding methods such as compression molding, transfer molding, and injection molding
It can be manufactured by a rubber molding method. For example, compression
In the case of molding, a core metal (a
(To form the core of the tool), and manufacture it by the method described above.
A sheet of the unvulcanized rubber composition thus prepared is placed on the sheet, usually 120 to
It is manufactured by pressure vulcanization at 250 ° C for about 3 minutes to 2 hours.
Can be The present invention will be further described below with reference to examples.
You. However, the present invention is not limited at all by the examples.
There is no. (First experiment) Wheels of the automobile shown in FIG.
It has the same shape as the sealing device 12a of the supporting rolling bearing,
A 60 mm sealing device was prepared. When manufacturing, seal
Cold rolling, pre-washed in a mold, coated with adhesive and baked
Insert a metal core 105 made of steel plate and insert HAF grade carbon
Sheet made of unvulcanized nitrile rubber containing black
Is placed at 180 ° C. for 5 minutes under a pressure of 30 kgf / cm. ^Two The load
Then, vulcanization molding was performed. As shown in Table 1,
Hardened steel sheet (Examples 1 to 8, Comparative Example 5)
Or steel sheet not subjected to hardening treatment (Comparative Examples 1-4)
A slinger 106 was attached to obtain a sealing device.
The Vickers hardness (Hv) of the slinger 106 is shown in Table 1.
Also described. Then, using a seal rotation tester shown in FIG.
The sealability test was performed assuming that it was immersed in muddy water.
gave. It should be noted that the illustrated seal rotation tester has a shaft 101.
And a sealing device 12a equipped with a slinger 106
While immersing in muddy water 102 stored inside
It is configured to rotate at a rotation speed. Also seal
When the muddy water 102 invades the muddy water side by breaking the
The detection is performed by the sensor 103. Prior to the test, each seal device 12a was
Thus, the incorporation into the shaft 101 was evaluated. The results are shown in Table 1.
Noted. The test was conducted under the following conditions to detect the infiltration of muddy water.
The time until notice (leakage time) was measured. Measurement result
Is shown in FIG.・ Rotation speed: 1000rpm ・ Test time: 100 hours or intrusion of muddy water is detected
Time to axis / axis eccentricity: 0.5mm TIR ・ Muddy water composition: JIS Class 8 dust 20%, salt 10% ・ Grease: lithium soap, mineral oil ・ Grease application amount: outer seal lip and middle seal lip
0.3g between the intermediate seal lip and the inner seal lip.
0.1 g during the test.
Abrasion amount of slinger 106 in sliding contact with lulip 114
Was measured, and the wear resistance of the slinger 106 was evaluated. the same
100 hours after the start of the test, generation of rust on the slinger 106
The situation is described in Examples 1 to 3 where films such as plating were further formed.
Then, the film was examined for damage. The occurrence of rust
About the outside of the outer annular portion 113 of the slinger 106
Measures the rate of rust on the surface, excellent when there is no rust at all
When the rusting ratio is 10% or less,
Good is indicated by "O" and the rust ratio is 10 to 40%
Is indicated as “不良” as slightly defective, and the rusting ratio is 40
% Is indicated as “bad” as a defect.
Also described in 1. [Table 1] As apparent from the results shown in Table 1 and FIG.
The Vickers hardness (Hv) within the range of the present invention is 5
Slinger of 00 or more has excellent abrasion resistance even under foreign matter contamination
As well as the sealing device incorporating this slinger.
The properties are also good. In particular, pretreatment with a fluorine compound
Examples 5 to 8 show good results,
Example 7 and Example in which carburizing treatment was performed after pretreatment with the compound
8 shows the best result. Also Vickers hardness
Example 2 and Example 4 in which (Hv) is 1000 or less
Example 5, Example 7 and Example 8 show the incorporation of a slinger.
Was also good. (Second experiment) Water cooling of the vehicle shown in FIG.
The shaft for supporting the rotating shaft of the water pump used in the engine
A water resistance test was performed using the seal device of the receiver. First,
In the metal mold, it was washed beforehand, coated with adhesive and baked
Insert a cored bar 61a made of a cold-rolled steel plate and insert MT carbon into it.
Place a sheet made of unvulcanized fluoro rubber containing
180 ° C for 10 minutes, pressure 30kgf / cm ^Two Loading and vulcanizing
After molding, remove it from the mold and put it in the oven,
Secondary vulcanization was carried out by holding at 200 ° C. for 4 hours.
The member was subjected to a curing treatment as shown in Table 1 and the shape shown in FIG.
A slinger 65 formed in a shape is attached to form a sealing device,
A test bearing was fabricated by incorporating the same. And in FIG.
Assembled in the test equipment 80 shown, seal life under the following conditions
Was measured. The test apparatus 80 shown in FIG.
1 through a housing 83.
Heating by the heater 84 and
The sealing device (shown in FIG.
) Is configured to supply a fixed amount of cooling water W.
Then, under the following conditions, the rotating shaft 8 is driven by the driving pulley 85.
1 is rotated at a constant rotational speed, and the rotating shaft 81 and the test bearing are rotated.
82 and continuously measure the resistance.
The time to reach 1/3 of the beginning was measured. The sign
86 is a thermocouple for temperature control.・ Rotation speed: 8000 rpm ・ Test time: Until the electric resistance reaches 1/3 of that before the test
Time / axis eccentricity: 0.1mm TIR or less ・ Cooling water composition: Equivalent mixture of CCI LLC and water
Compound / water injection amount: 50 ml / min Bearing temperature: 150 ° C. The results are shown in FIG.
v) 500 or more slinger,
It can be seen that the tool life is greatly improved. As described above, the sealing device of the present invention
The slinger has a Vickers hardness (Hv) of 500 or more.
Because it was formed of steel sheet,
Excellent even when used in environments where hard particles are present
Has excellent sealing performance and maintains the desired performance for a long time
be able to.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a sectional view showing an example of a rolling bearing for supporting a wheel of an automobile. FIG. 2 is an enlarged view of one sealing device (12a) of the rolling bearing shown in FIG. FIG. 3 is an enlarged view of the other sealing device (12b) of the rolling bearing shown in FIG. FIG. 4 is a sectional view showing an example of a water pump. FIG. 5 is an enlarged view showing a sealing device for a bearing for supporting a rotating shaft of the water pump shown in FIG. 4; FIG. 6 is a schematic sectional view showing a test apparatus used for a sealing test (test-1). FIG. 7 is a graph showing the results of a sealing test. FIG. 8 is a schematic sectional view showing a test apparatus used for a water resistance test (test-2). FIG. 9 is a graph showing the results of a water resistance test. [Description of Signs] O Rolling bearing 1 Outer ring equivalent member 4 Inner ring equivalent member 10 Rolling element 11 Cage 12a Sealing device 12b Sealing device 50 Water pump 51 Impeller 52 Rotating shaft 55 Rolling bearing 60 Sealing device 61 Sealing plate 62 Sealing body 65 Slinger 105 core metal 106 slinger 107 elastic member

   ────────────────────────────────────────────────── ─── Continuation of front page    (72) Inventor Toru Takehara             Kanagawa Prefecture Fujisawa City Kugenuma Shinmei 1-chome 5-50             Nippon Seiko Co., Ltd. (72) Inventor Toshiki Takagi             Kanagawa Prefecture Fujisawa City Kugenuma Shinmei 1-chome 5-50             Nippon Seiko Co., Ltd. (72) Inventor Kenji Yamamura             Kanagawa Prefecture Fujisawa City Kugenuma Shinmei 1-chome 5-50             Nippon Seiko Co., Ltd. F term (reference) 3J016 AA01 AA02 AA03 BB02 BB03                       BB16 CA02                 3J101 AA02 AA32 AA43 AA54 AA62                       CA12 DA02 EA06 EA78 FA13                       FA31 GA01 GA29

Claims (1)

Claims: 1. An outer race having an outer raceway on an inner peripheral surface, an inner racer having an inner raceway on an outer peripheral surface, and rollingly provided between the outer raceway and the inner raceway. A plurality of rolling elements,
A sealing device for a sealed bearing, comprising: a sealing device for closing an axial opening of a space in which the rolling element is provided between an inner peripheral surface of the outer ring and an outer peripheral surface of the inner ring. And a seal made of an elastic material and having a lip formed thereon, and at least a slinger slidingly contacting the lip, and at least a portion of the slinger slidingly contacting the lip has a Vickers hardness (Hv) of 50.
A sealing device characterized by being 0 or more.