CN101175974B

CN101175974B - Magnetic encoder and rolling bearing unit comprising magnetic encoder

Info

Publication number: CN101175974B
Application number: CN2006800163322A
Authority: CN
Inventors: 矢部俊一; 村上豪; 相原成明
Original assignee: NSK Ltd
Current assignee: NSK Ltd
Priority date: 2005-05-10
Filing date: 2006-05-09
Publication date: 2011-03-30
Anticipated expiration: 2026-05-09
Also published as: CN101175974A

Abstract

Disclosed is a magnetic encoder which is produced by integrally bonding a magnet part, which is obtained by forming a magnetic material containing a magnetic powder and a binder for the magnetic powder into an annular shape, with a slinger. The binder contains at least a thermoplastic resin and an impact strength modifier.

Description

Magnetic coder and roller bearing with magnetic coder

Technical field

The present invention relates to be used to detect rotating member rotation number magnetic coder and have the roller bearing of magnetic coder.

Background technology

So far, often use the equipment that constitutes by detecting sensor, as the rotation number checkout equipment that is used to stop the anti-skidding of automobile slip or is used for driving force effectively is passed to the traction control on road surface by the magnetic coder of magnetic production burst and the magnetic-pulse that detects magnetic coder.Usually using is equipped with the sealing of rotation number checkout equipment as the rotation number checkout equipment.This equipment is arranged this magnetic coder by companion to the water-tight equipment that bearing seals, thereby constitutes (for example referring to patent documentation 1) to make the combination of packoff and rotation number pick-up unit.

Be equipped with an embodiment of the sealing of rotation number checkout equipment to be shown among Figure 13, sealing by the containment member 202 that is attached to outer shroud 201a, be mounted in the oil scraper ring (slinger) 203, the sensor 205 that is used to detect magnetic-pulse that is used to generate the magnetic coder 204 of magnetic-pulse and be adjacent to that magnetic coder 204 arranges that is attached to the lateral surface of oil scraper ring 203 of ring 201b constitute.According to the bearing unit that adheres to Packed rotation number checkout equipment, prevent foreign matters intrusion bearing inside such as dust, water by containment member 202 and oil scraper ring 203, and prevent that the lubricant that is seated in bearing inside from leaking to the bearing outside.In addition, magnetic coder 204 produces the magnetic-pulse number that is equivalent to number of electrodes during the interior ring 201b rotation time cycle once, and by utilizing sensor 205 to detect the rotation number that magnetic-pulse detects interior ring 201b.

In addition, in magnetic coder 204, the magnet part that is formed by flexible magnetic material is bonded to the flange portion 203a of oil scraper ring 203, wherein this flexible magnetic material obtains by mixing with Magnaglo with such as the resilient material of rubber or resin, wherein adhesive is applied to this oil scraper ring 203 in mould (die) by pressing mold.Usually the nitrile rubber that uses contain ferrite is as flexible magnetic material, and this Magnaglo is in the mechanical orientation state, and this mechanical orientation state is realized by utilizing roller to mediate this powder.

Patent documentation 1: Japanese uncensored patent is announced JP-A-2001-255337

Summary of the invention

Recently, in order more accurately to detect the rotation number of wheel, there is the trend of the number of electrodes (multipole structure) that along the circumferential direction increases magnetic coder 204.Yet according to the magnetic coder 204 of the rubber magnet with the contain ferrite that adopts traditional mechanical orientation method, the magnetic flux density of each electrode becomes too little.Therefore, in order accurately to detect rotation number, must reduce the gap (being the clearance) between sensor 205 and the magnetic coder 204.In addition, because when improving the performance of automobile, magnetic coder 204 is used in the bottom of automobile, may be exposed to about 120 ℃ hot environment and about-40 ℃ low temperature environment so infer this magnetic coder, and slime water, Snow Agent, oil and may be attached to the surface of this magnetic coder such as the fat of grease.

As the countermeasure of this problem,, must improve the magnetic characteristic of magnet part in order to increase this clearance.Yet, because the rare-earth magnetic powder as the magnetic material with high magnetic characteristic is expensive usually, and compare with the ferrite Magnaglo and to show low oxidative resistance, so worry that when the rare-earth magnetic powder is used for above-mentioned environment the rare-earth magnetic powder is oxidized and rotten, thereby cause reducing more greatly of magnetic characteristic.In addition, with by utilizing the plastic magnet formed by ferrite Magnaglo and plastics to compare with the situation of the rubber magnet (rubber magnet) that improves magnetic characteristic, this magnet part can comprise a large amount of Magnaglos, yet, in this case, magnet part becomes fragility, and extension property and bending property reduction.Therefore, when supposition in the magnet part repeated exposure under the situations such as automobile during in hot environment/low temperature environment, the distortion of magnet part can not be got caught up in the distortion (change in size) of oil scraper ring 203, and in worst case, there is following danger, promptly begins to produce crack etc. in the magnet portion office from the tender spots of magnet part.In addition, when magnet part is exposed to high temperature,, cause the extension property of magnet part and the further reduction of bending property with take place constituting the oxidative degradation of resin material of the joint portion of magnet part.Therefore, when magnet part repeated exposure during, be easy to further produce the crack in the magnet portion office in hot environment/low temperature environment.

Produce the present invention in order to address the above problem, the purpose of this invention is to provide a kind of highly reliable magnetic coder, even can not produce the crack when this magnetic coder uses under the mal-condition jumpy such as temperature in the magnet portion office yet, and have high magnetic characteristic, and can highly precisely detect rotation number; And provide a kind of high-performance and highly reliable roller bearing unit with magnetic coder.

The method of dealing with problems

To achieve these goals, the present inventor has specialized in the plastic magnet material that can comprise a large amount of Magnaglos and have good magnetic characteristic.Because the broad research of the bond material being carried out in order to improve elasticity, it is effectively that the inventor finds to use the bond that comprises thermoplastic resin and impact resistance improver, and therefore realizes the present invention.

That is to say, the invention provides following magnetic coder and roller bearing unit.

(1) a kind of magnetic coder, it constitutes by magnet part integral body is bonded to oil scraper ring, this magnet part can form annular by the magnetic material that will comprise Magnaglo and be used for the bond of Magnaglo and obtain, and wherein bond comprises thermoplastic resin and impact resistance improver at least.

(2) according to the magnetic coder of (1), wherein thermoplastic resin is a polyamide, and the impact resistance improver is at least a in the polyamide of vulcanized rubber particle and modification.

(3) according to the magnetic coder of (1), wherein thermoplastic resin is a polyester-based resin, and the impact resistance improver is at least a in the polyamide of vulcanized rubber particle and modification.

(4) according to the magnetic coder of (1), wherein thermoplastic resin is a polyphenylene sulfide, and the impact resistance improver is the vulcanized rubber particle.

(5) according to the magnetic coder of (2), wherein thermoplastic resin is the low water absorbable polyamide.

(6) according to the magnetic coder of (1), wherein thermoplastic resin is a polyamide, and bond also comprises the aromatic amino antioxidant.

(7) a kind of roller bearing unit, it has: set collar; Swivel eye; Along the circumferential direction be arranged in a plurality of rolling elements between set collar and the swivel eye in rotary manner; With according to each the magnetic coder in the claim (1) to (6), wherein magnet part utilizes adhesive to be fixed to the oil scraper ring of being made up of magnetic material, and oil scraper ring is fixed to swivel eye.

Advantage of the present invention

According to magnetic coder of the present invention, described magnet part comprises a large amount of Magnaglos, and therefore has good magnetic characteristic, and comprises having good fatigue resistence and stable on heating thermoplastic resin and impact resistance improver.Therefore, because the amount of bow that increases, so even even be exposed to high temperature or low temperature and, also can keep better elastic when magnet part when this magnet part repeated exposure during in high temperature and low temperature.Therefore, the degree of accuracy that detects rotation is higher, and reliability is also higher.In addition, the roller bearing unit with magnetic coder also has high-performance and high reliability.

Description of drawings

Fig. 1 is the cut-open view of an embodiment that expression has the roller bearing unit of magnetic coder.

Fig. 2 is near the cut-open view of the scrambler of presentation graphs 1.

Fig. 3 represents the synoptic diagram of the embodiment of the magnetized magnet part of multipolar system along the circumferential direction.

Fig. 4 is the skeleton view of expression oil scraper ring after pressing mold.

Fig. 5 is the cut-open view of the state of expression oil scraper ring during pressing mold.

Fig. 6 is the cut-open view of another embodiment that expression has the roller bearing of magnetic coder.

Fig. 7 is the cut-open view of another embodiment that expression has the roller bearing unit of magnetic coder.

Fig. 8 is near the cut-open view of the magnetic coder of presentation graphs 7.

Fig. 9 is the cut-open view of major part of another embodiment of the roller bearing unit of expression with magnetic coder.

Figure 10 is the synoptic diagram of another embodiment of the magnetic pole in the expression magnet part.

Figure 11 is the synoptic diagram of another embodiment of the magnetic pole in the expression magnet part.

Figure 12 is the synoptic diagram of other embodiment of the magnetic pole in the expression magnet part.

Figure 13 is the cut-open view that expression has the roller bearing unit of traditional magnetic coder.

Reference numeral

10 roller bearing unit

11 outer shrouds

Ring in 12

13 balls

14 steady arms (retainer)

15 water-tight equipments

16 containment members

17 oil scraper rings

17d sunk part and outshot

Embodiment

Describe the present invention in detail below with reference to accompanying drawing.

Magnetic coder of the present invention has magnet part, and this magnet part has the magnetic material of Magnaglo and following particular combination agent forms by arranging circumferentially.

For the material of oil scraper ring, most preferably do not make the magnetic characteristic deterioration of magnet material and magnetic material, such as ferritic stainless steel (SUS430 etc.) or martensitic stain less steel (SUS410 etc.) with corrosion resistance of the common degree of the environment for use of being equal to or higher than.At this moment,, then do not require corrosion resistance like this, can use cold-rolled steel sheet (SPCC) etc. according to cost thus when bearing unit has sender unit cap when (with reference to the 3rd embodiment).

On the other hand, for the Magnaglo that constitutes magnetic material, consider magnetic characteristic and anti-weather effect, can preferably use the ferrite Magnaglo, such as strontium ferrite or barium ferrite, the perhaps rare-earth magnetic powder of samarium-iron-nitrogen, samarium-cobalt or neodymium-iron-boron.These Magnaglos can be used singly or in combination.At this moment, when the groundwork environment be hot environment (for example, about 150 ℃) time, when the high magnetic characteristic of needs (BHmax surpass 2.0MGOe), use the rare-earth magnetic powder, preferably comprise the prescription of ferrite Magnaglo in view of cost when enough as principal ingredient in low magnetic characteristic (BHmax be 1.6 to 2.0MGOe).In addition, the content of the Magnaglo in the magnetic material depends on the kind of Magnaglo, but can not occur the problem put into practice when content drops in 70 to 92wt% the scope.Yet, because magnet part is in the temperature lower mould of the thermoplastic resin that is equal to or higher than bond, so magnetic may reduce when utilizing samarium-iron-nitrogen, so preferred higher Magnaglo content.

In addition, about Magnaglo, in order to improve the interaction of degree of separation and improvement and bond, the silane coupling agent that preferably will have such as the organo-functional group of amino or epoxy radicals adds in the magnetic material.

This bond is that the impact resistance improver is added into material at least a thermoplastic resin.Adopt at least a in polyphenylene sulfide, polyester-based resin and the polyamide as thermoplastic resin.

About polyphenylene sulfide, can use any in linear resins and the crosslinked branching resin, but in view of toughness and preferred linear resins.In addition, it can be mixed and in extruder etc. during granulation, this polyphenylene sulfide is preferably powder-product with Magnaglo when the dispersiveness of material and homogenieity.

Polyester-based resin is to have good fatigue resistence and stable on heating resin, and has the effect of the heat shock resistance that improves magnet part.Preferred polyethylene terephthalate, polybutylene terephthalate, PEN, PBN, poly terephthalic acid-1,4-cyclohexanedimethanol and poly terephthalic acid-1,4 cyclohexane dimethanol/pet copolymer is as polyester-based resin.In these, preferred high polybutylene terephthalate and the PBN of crystallization rate.These polyester-based resin can be used separately or suitably be used in combination.

Polyamide also is to have good fatigue resistence and stable on heating resin, and has the effect of the heat shock resistance that improves magnet part.In polyamide, polyamide 6, polyamide 66 and polyamide 46 are preferred, and can use separately or suitably be used in combination.

On the other hand, because polyamide 6 (PA6), polyamide 66 (PA66) and polyamide 46 (PA46) have high water absorptivity (seeing Table 1), the preferred polyamide of low water absorbable that uses is as polyamide, it is used in combination, so that deal with very moistening environment with polyamide 6, polyamide 66 or polyamide 46.

When preferably reaching 24 hours in immersing 23 ℃ water, water-intake rate (weight increase than) is that 0.7wt% or littler polyamide are as the low water absorbable polyamide.Particularly, can adopt polyamide 12 (PA12), polyamide 11 (PA11), polyamide 6 12 (PA612), the polyamide 6 T (PA6T) of polyamide 6 10 (PA610) modification, polyamide 9T (PA9T), polyamide MXD6 (PAMXD6) etc.

Here, the polyamide 6 T of modification is:

As the part terephthalic acids of the polyamide 6 T of the polycondensation product of hexamethylenediamine and terephthalic acids change at least a polycondensation product in hexane diacid and the isophathalic acid (particularly, PA6T/66, PA6T/6I, PA6T/6I/66),

The part hexamethylenediamine of polyamide 6 T changes the polycondensation product (PA6T/M-5T) of methylpent diamines into,

Utilize polyamide 6 T and epsilon-caprolactams as polycondensation product (PA6T/6) of repetitive etc.

In addition, polyamide MXD6 is the polycondensation product of m-xylene diamine (metaxylylenediamine) and hexane diacid.

The water-intake rate (measured value under the foregoing description condition) of the above-mentioned polyamide of table 1 expression, the fusing point of the above-mentioned polyamide of table 2 expression.In the polyamide of low water absorbable, the polyamide 6 T of preferred modification, polyamide 9T and polyamide MXD6, it is former because these polyamides have low water absorbable and have thermotolerance.

[table 1]

Water-intake rate (wt%)

PA12

PA11

PAMXD6

The PA6T of modification

?PA9T

?PA610

?PA612

?PA66

PA6

0.25

0.30

0.31

0.3-0.68

?0.17

?0.50

?0.25

?1.30

1.80

[table 2] fusing point (℃)

PA12	PA11	PAMXD6	Modified Pa 6 T	PA9T	PA610	PA612	PA66	PA6
									176	187	243	290-320	317	213- 225	212- 219	260- 265	220- 228

About the polyamide of low water absorbable, when considering polyamide with after Magnaglo mixes when the dispersiveness in the granulation in the extruder etc. and homogenieity of the material in the gained magnet part or the like, preferred powdered product.

The impact resistance improver is to have vibrating and impact the resilient material that carries out alleviating function.In the present invention, can suitably adopt resin and rubber as follows according to thermoplastic resin.

When thermoplastic resin is polyphenylene sulfide, use elastomeric material.In these elastomeric materials since with the highly compatible of polyphenylene sulfide, so preferably by styrene-butadiene rubber, acrylic rubber, butyronitrile-rubber, carboxy-modified nitrile rubber, silicon rubber, neoprene, hydrogenated nitrile-butadiene rubber, carboxy-modified hydrogenated nitrile-butadiene rubber, carboxy-modified styrene-butadiene rubber, or the vulcanized rubber particle of the unconjugated diene rubber composition of ethylene-propylene, these vulcanized rubber particles can be used singly or in combination.In these vulcanized rubber particles, the preferred particle of forming by acrylic rubber or carboxy-modified hydrogenated nitrile-butadiene rubber, this acrylic rubber or carboxy-modified hydrogenated nitrile-butadiene rubber have in molecule with polyphenylene sulfide and carry out functional group than strong interaction, such as carboxyl or ester group.

In order to prevent because the degeneration that heat and oxygen cause, can with such as 4,4 '-the hexichol amido antiaging agent of (α, α-Er Jiajibianji) diphenylamine, add in these rubber particles such as the auxiliary antiaging agent of 2-mercaptobenzimidazole etc.

It is 30 to 300nm minuteness particle that these rubber particles are preferably mean grain size.When mean grain size during, except it expensive, and, particle tends to easy degeneration, so this situation is not preferred owing to becoming too little less than 30nm.When mean grain size during, be difficult to improve uniformly impact resistance because dispersiveness reduces and particle becomes, so this situation is not preferred greater than 300nm.

In addition, according to the total amount of impact resistance improver and polyphenylene sulfide, the addition of impact resistance improver is preferably 5 to 30wt%, and more preferably 10 to 20wt%.When addition during less than 5wt%, improvement effect is because the amount of impact resistance improver is too little and less, so this situation is not preferred.When addition during greater than 30wt%, improved impact resistance, less but the quantitative change of polyphenylene sulfide gets, therefore reduced tensile strength etc., thereby made the practicality step-down.

When thermoplastic resin was vibrin, the polyester-based resin that can use modification was as the impact resistance improver.The polyester-based resin of modification is to comprise the hard segment of above-mentioned polyester-based resin and the segmented copolymer of at least a soft chain segment in polyester composition and the polyether components.In the polyester-based resin of these modifications, preferably comprise polyethylene terephthalate or PBN polyester-based resin as the modification of hard segment.In addition, when considering with polyester-based resin to be mixed compatible, the polyester-based resin of the modification that preferred hard segment is identical with the hard segment line of polyester-based resin.In addition, about the polyester-based resin of modification, powdered product is suitable.

As the concrete example of the polyester-based resin of modification, can mention and comprising by the polybutylene terephthalate of following general formula (1) expression as hard segment and polyether components polyester-based resin as the polybutylene terephthalate base modification of soft chain segment

[Chemical formula 1]

Comprise by the polybutylene terephthalate of following general formula (2) expression as hard segment and polyester composition polyester-based resin as the polybutylene terephthalate base modification of soft chain segment.

[Chemical formula 2]

Comprise by the PBN of following general formula (3) expression as hard segment and polyether components polyester-based resin as the PBN base modification of soft chain segment.

[chemical formula 3]

In these concrete examples, preferably have the polyester-based resin of the modification of the hard segment of representing by general formula (2) or (3), it has good thermotolerance.When also needing ozone resistants, when water resisting property and oil resistance, preferably has the polyester-based resin of the modification of the hard segment of representing by general formula (3).

In addition, when thermoplastic resin is vibrin, preferred styrene-butadiene rubber, acrylic rubber, nitrile rubber, carboxy-modified nitrile rubber, silicon rubber, neoprene, hydrogenated nitrile-butadiene rubber, carboxy-modified hydrogenated nitrile-butadiene rubber, or the vulcanized rubber particle of carboxy-modified styrene-butadiene rubber is as elastomeric material, and these vulcanized rubber particles can be used singly or in combination.In these vulcanized rubber particles, when the granulation of magnet part and molded in when considering deterioration, preferred acrylic rubber, nitrile rubber, carboxy-modified nitrile rubber, silicon rubber, hydrogenated nitrile-butadiene rubber, or the particle of carboxy-modified hydrogenated nitrile-butadiene rubber.In addition, in these particles, preferred acrylic rubber, carboxy-modified nitrile rubber, or the particle of carboxy-modified hydrogenated nitrile-butadiene rubber, this acrylic rubber, carboxy-modified nitrile rubber or carboxy-modified hydrogenated nitrile-butadiene rubber have in molecule with polyester-based resin and carry out functional group than strong interaction, such as carboxyl or ester group.

In order to prevent because the deterioration that heat and oxygen cause, such as 4,4 '-the hexichol amido antiaging agent of (α, α-Er Jiajibianji) diphenylamine, can be added in these rubber particles such as the auxiliary antiaging agent of 2-mercaptobenzimidazole etc.

It is 30 to 300nm minuteness particle that these rubber particles are preferably mean grain size.When mean grain size during less than 30nm, since expensive and make its easy deterioration owing to particle is too little, so this situation is not preferred.When mean grain size during, be difficult to improve equably impact resistance because dispersiveness reduces and particle becomes, so this situation is not preferred greater than 300nm.

In addition, also can use ethylene, propylene non-conjugated diene rubber (EPDM), maleic anhydride-modified ethylene-propylene non-conjugated diene rubber (EPDM), ethene/acidylate multipolymer, ionomers etc. are as the impact resistance improver.This impact resistance improver adopts globular form, but its preparation during magnetic material when in extruder, mediating be with Magnaglo, polyester-based resin etc. fluidisation and differential be dissipated in the polyester-based resin.

According to the total amount of impact resistance improver and polyester-based resin, the addition of impact resistance improver is preferably 5 to 50wt%, and more preferably 10 to 40wt%.When addition during less than 5wt%, improvement effect is because the amount of impact resistance improver is too little and less, so this situation is not preferred.When addition during greater than 50wt%, improved impact resistance, less but the quantitative change of polyester-based resin gets, therefore reduced tensile strength etc., thereby made the practicality step-down.

In order to prevent polyester-based resin and impact resistance improver because heating and deterioration, so except originally being added into those of this material, also be suitable for adding separately antioxidant.The hindered phenol based compound, such as 2, two [(octyl group sulphur) the methyl]-o-cresols of 4-, triethylene glycol two [3-(the 3-tert-butyl group-5-methyl-4-hydroxyphenyl) propionate], [3-(3 for pentaerythrite four, 5-two-tert-butyl group-4-hydroxyphenyl) propionate], 1,3,5-trimethyl-2,4,6-three (3,5-two-tertiary butyl-4-hydroxy benzene) benzene, and N, N '-hexamethylene two (3,5-two-tertiary butyl-4-hydroxy-hydrocinnamamide, hydroquinone derivative, such as 2,5-two-TBHQ, sulfur-based compound is such as two [2-methyl-4-{3-n-alkyl (C ₁₂Or C ₁₄) the sulfo-propionyloxy-the 5-tert-butyl-phenyl] sulfide, phosphite ester based compound and diphenylamine based compound are such as 4,4 ' (α, α-Er Jiajibianji) diphenylamine and 4,4 '-dioctyl diphenylamine, the p-phenylenediamine (PPD) based compound, such as N, N '-biphenyl-p-phenylenediamine (PPD), N-isopropyl-N '-phenyl-p-phenylenediamine (PPD), N, N '-two-2-naphthyl-p-phenylenediamine (PPD), N, N '-two (1-methylheptyl)-p-phenylenediamine (PPD), N, N '-two (1,4-dimethyl amyl group)-p-phenylenediamine (PPD), and N-(1, the 3-dimethylbutyl)-N '-phenyl-p-phenylenediamine (PPD) is suitably as antioxidant.In above-claimed cpd, diphenylamine based compound and p-phenylenediamine (PPD) based compound have big oxidative resistance effect, and are only.

The addition of these antioxidants be preferably the bond total amount 0.05 to 1.0wt%, more preferably 0.1 to 0.5wt%.When the addition of antioxidant during less than 0.05wt%, the improvement effect of oxidative resistance is less, so this situation is not preferred.When addition during greater than 1.0wt%, therefore the effect of oxidative resistance does not change, and magnetic characteristic and physical strength reduce to reduce owing to the growing amount of Magnaglo and bond, so this situation is not preferred.

In addition, when thermoplastic resin was polyamide, the polyamide that can use modification was as the impact resistance improver.The polyamide of modification is to have the hard segment be made up of polyamide and by the segmented copolymer of at least a soft chain segment of forming in polyester composition and the polyether components, and as at commercially available product, the known polyamide 6 that comprises, polyamide 11 or polyamide 12 are as the polyamide of the modification of hard segment.In the polyamide of these modifications, in view of the polyamide of the preferred hard segment of the compatibility modification identical with the polyamide that constitutes bond.In addition, about the polyamide of modification, powdered product is suitable.

In addition, when plastic material is polyamide, preferred styrene-butadiene rubber, acrylic rubber, nitrile rubber, carboxy-modified nitrile rubber, silicon rubber, neoprene, hydrogenated nitrile-butadiene rubber, carboxy-modified hydrogenated nitrile-butadiene rubber, or the vulcanized rubber particle of carboxy-modified styrene-butadiene rubber is as elastomeric material, and these vulcanized rubber particles can be used singly or in combination.In these vulcanized rubber particles, when consider the granulation of magnet part and molded in deterioration the time, preferably by acrylic rubber; nitrile rubber, carboxy-modified nitrile rubber, silicon rubber; hydrogenated nitrile-butadiene rubber, or the particle of carboxy-modified hydrogenated nitrile-butadiene rubber formation.In addition, in these particles, preferred acrylic rubber, carboxy-modified nitrile rubber, or the particle of carboxy-modified hydrogenated nitrile-butadiene rubber, this acrylic rubber, carboxy-modified nitrile rubber, or carboxy-modified hydrogenated nitrile-butadiene rubber has in molecule with polyamide and carries out functional group than strong interaction, such as carboxyl or ester group.

In order to prevent because the deterioration that heat and oxygen cause, can with such as 4,4 '-the hexichol amido antiaging agent of (α, α-Er Jiajibianji) diphenylamine, add in these rubber particles such as the auxiliary antiaging agent of 2-mercaptobenzimidazole etc.

In addition, also can use ethylene, propylene non-conjugated diene rubber (EPDM), maleic anhydride-modified ethylene-propylene non-conjugated diene rubber (EPDM), ethene-acidylate multipolymer, ionomers etc. are as the impact resistance improver.This impact resistance improver adopts the form of coccoid (pellet), but its when the preparation magnetic material when in extruder, mediating with granulation with Magnaglo, polyester-based resin etc., for fluidisation and differential be dissipated in the polyamide.

According to the total amount of impact resistance improver and polyamide, the addition of impact resistance improver is preferably 5 to 60wt%, and more preferably 5 to 50wt%, and more preferably 10 to 40wt%.When addition during less than 5wt%, improvement effect is because the amount of impact resistance improver is too little and less, so this situation is not preferred.When addition during greater than 60wt%, improved impact resistance, less but the quantitative change of polyamide gets, therefore reduced tensile strength etc., thereby made the practicality step-down.

In order to prevent polyamide and impact resistance improver because heating and deterioration, so except originally being added into those of this material, also be suitable for adding separately antioxidant.The hindered phenol based compound, such as 2, two [(octyl group sulphur) the methyl]-o-cresols of 4-, triethylene glycol two [3-(the 3-tert-butyl group-5-methyl-4-hydroxyphenyl) propionate], [3-(3 for pentaerythrite four, 5-two-tert-butyl group-4-hydroxyphenyl) propionate], 1,3,5-trimethyl-2,4,6-three (3,5-two-tertiary butyl-4-hydroxy benzene) benzene, and N, N '-hexamethylene two (3,5-two-tertiary butyl-4-hydroxy-hydrocinnamamide, hydroquinone derivative, such as 2,5-two-TBHQ, sulfur-based compound is such as two [2-methyl-4-{3-n-alkyl (C ₁₂Or C ₁₄) sulfo-propiono oxygen-the 5-tert-butyl-phenyl] sulfide, phosphite ester based compound and diphenylamine based compound; such as 4; 4 ' (α, α dimethyl benzyl) diphenylamine and 4,4 '-the dioctyl diphenylamine; the p-phenylenediamine (PPD) based compound; such as N, N '-biphenyl-p-phenylenediamine (PPD), N-isopropyl-N '-phenyl-p-phenylenediamine (PPD); N; N '-two-2-naphthyl-p-phenylenediamine (PPD), N, N '-two (1-methylheptyl)-p-phenylenediamine (PPD); N; N '-two (1,4-dimethyl amyl group)-p-phenylenediamine (PPD), and N-(1; the 3-dimethylbutyl)-N '-phenyl-p-phenylenediamine (PPD) and can be suitable for as antioxidant such as the aromatic diaminodithiol compound of naphthylamine base compound.In above-claimed cpd, diphenylamine based compound and p-phenylenediamine (PPD) based compound have big oxidative resistance effect, and are only.

The addition of these antioxidants be preferably the bond total amount 0.05 to 2.0wt%, more preferably 0.05 to 1.0wt%, more preferably 0.1 to 0.5wt%.When the addition of antioxidant during less than 0.05wt%, the improvement effect of oxidative resistance is less, so this situation is not preferred.When addition during greater than 2.0wt%, therefore the effect of oxidative resistance does not change, and magnetic characteristic and physical strength reduce to reduce owing to the growing amount of Magnaglo and bond, so this situation is not preferred.

When thermoplastic resin was the low water absorbable polyamide, the low water absorbable polyamide that can use modification was as the impact resistance improver.The low water absorbable polyamide of modification is to have the hard segment be made up of above-mentioned low water absorbable polyamide and by the segmented copolymer of at least a soft chain segment of forming in polyester composition and the polyether components, and as at commercially available product, the known polyamide that comprises polyamide 11 or polyamide 12 as the modification of hard segment.In addition, in view of compatibility, the low water absorbable polyamide of the modification that preferred hard segment is identical with the low water absorbable polyamide that is used as bond.In addition, can use the polyamide 12 of modification.In addition, about the low water absorbable polyamide of modification, powdered product is suitable.

In addition, be in the situation of low water absorbable polyamide at thermoplastic resin, preferred styrene-butadiene rubber, acrylic rubber, nitrile rubber, carboxy-modified nitrile rubber, silicon rubber, neoprene, hydrogenated nitrile-butadiene rubber, carboxy-modified hydrogenated nitrile-butadiene rubber, or carboxy-modified styrene-butadiene rubber, perhaps the vulcanized rubber particle of ethylene-propylene non-conjugated diene rubber (EPDM) formation is as elastomeric material, and these vulcanized rubber particles can be used singly or in combination.In these vulcanized rubber particles, when the granulation of magnet part and molded in when considering deterioration, preferred acrylic rubber, nitrile rubber, carboxy-modified nitrile rubber, silicon rubber, hydrogenated nitrile-butadiene rubber, or the particle that constitutes of carboxy-modified hydrogenated nitrile-butadiene rubber.In addition, in these particles, preferred acrylic rubber, carboxy-modified nitrile rubber, or the particle of carboxy-modified hydrogenated nitrile-butadiene rubber formation, this acrylic rubber, carboxy-modified nitrile rubber, or carboxy-modified hydrogenated nitrile-butadiene rubber has in molecule with the low water absorbable polyamide and carries out functional group than strong interaction, such as carboxyl or ester group.

In order to prevent because the deterioration that heat and oxygen cause, such as 4,4 '-the hexichol amido antiaging agent of (α, α-Er Jiajibianji) diphenylamine, can add in these rubber particles such as the auxiliary antiaging agent of 2-mercaptobenzimidazole etc.

According to the total amount of impact resistance improver and low water absorbable polyamide, the addition of impact resistance improver is preferably 5 to 60wt%, and more preferably 10 to 40wt%.When addition during less than 5wt%, improvement effect is because the amount of impact resistance improver is too little and less, so this situation is not preferred.When addition during greater than 60wt%, improved impact resistance, less but the quantitative change of low water absorbable polyamide gets, therefore reduced tensile strength etc., thereby made the practicality step-down.

In order to prevent low water absorbable polyamide and impact resistance improver because heating and deterioration, so except originally being added into those of this material, also be suitable for adding amido antioxidant with high antioxidant effect.In the amido antioxidant, aromatic diaminodithiol compound is as the diphenylamine based compound, such as 4,4 ' (α, α-Er Jiajibianji) diphenylamine and 4,4 '-the dioctyl diphenylamine, the p-phenylenediamine (PPD) based compound, such as N, N '-biphenyl-p-phenylenediamine (PPD), N-isopropyl-N '-phenyl-p-phenylenediamine (PPD), N, N '-two-2-naphthyl-p-phenylenediamine (PPD), N, N '-two (1-methylheptyl)-p-phenylenediamine (PPD), N, N '-two (1,4-dimethyl amyl group)-p-phenylenediamine (PPD), and N-(1, the 3-dimethylbutyl)-N '-phenyl-p-phenylenediamine (PPD) is suitable.

The addition of amido antioxidant be preferably the bond total amount 0.5 to 2.0wt%.When the addition of amido antioxidant during less than 0.5wt%, the improvement effect of oxidative resistance is less, so this situation is not preferred.When addition during greater than 2.0wt%, therefore the effect of oxidative resistance does not change, and magnetic characteristic and physical strength reduce to reduce owing to the growing amount of Magnaglo and bond, so this situation is not preferred.

For the magnetic material that comprises bond, amount of bow (t=3.0mm, ASTMD790 under 23 ℃; Span is 50mm) in 2 to 15mm scope.Because material has good flexural property, so this material has high cracking resistance, even and when this material repeatedly is exposed to high temperature and low temperature, also be difficult to the destruction in generation such as crack in magnet part.

When making magnetic coder, at first utilize oil scraper ring that magnetic material is carried out embedded mold pressing, wherein bonding agent cures to this oil scraper ring as core in advance.At this moment, preferably use plate-like gate type injector.The fusion magnetic material is expanded with disc shaped, flows into then in the mould corresponding to the thick portion of internal diameter, and the Magnaglo that is included in squamous shape wherein thus is parallel to surface orientation.Particularly, the inner-diameter portion whose and the part between the outer radius portion of thick the vicinity of being detected by rotation sensor of internal diameter have higher orientation, and on thickness direction very near axial anisotropy orientation.When magnetic field in molded when thickness direction is applied to mould (magnetic field is molded), anisotropy further becomes near anisotropy fully.On the other hand; even when carrying out magnetic field when molded; when adopting side gate type injector; in the viscosity that increases the fusion magnetic material gradually to the process of solidifying; also be difficult to make fully the anisotropy that is orientated of welding portion; therefore have following possibility, promptly the magnetic characteristic deterioration and in physical strength owing to use the generation crack, weld part office that reduces etc. for a long time, so this situation is not preferred.

Preferably can be and approximately be cured the alkyd resin based adhesive, epoxy resin-matrix adhesive etc. of reaction as the adhesive that can be used for curing to oil scraper ring therein with two stages by solvent dilution.These adhesives have following advantage, promptly have good thermotolerance, chemical resistance, operating performance etc.

The alkyd resin based adhesive that is used as the sulfuration adhesive of rubber is preferred, though and the composition of alkyd resin based adhesive is not specifically limited, but can use novolac resin or resol formula phenolics and be dissolved in methyl alcohol or methyl ethyl ketone etc. in the hardening agent of hexamethyl tetramine etc.In addition, in order to improve bonding agent, this bonding agent can mix mutually with thermoplastic epoxy.

For the epoxy resin-matrix adhesive, a kind of solution-type epoxy radicals adhesive that preferably can be diluted to solvent is as raw material liq.The magnet material that this solution-type epoxy radicals adhesive is on the oil scraper ring surface by appropriate temperature and time after this solvent of evaporation under the high temperature and high pressure of embedded mold pressing by molten plastic reaches the semi-cured state that does not flow away, and owing to the heat and the auxiliary heating of the fusion magnetic material in the embedded mold pressing reaches the full solidification state.

A kind of solution-type epoxy radicals adhesive comprises epoxy resin and hardening agent at least.About this hardening agent, curing reaction takes place near being difficult in room temperature, but hardening agent for example is issued to semi-cured state at about 80 to 120 ℃, and by heating under 120 to 180 ℃ high temperature complete heat curing reaction takes place.Adhesive can with as other epoxy compound of reaction diluent, be used to increase heat curing speed curing accelerator, realize improving thermotolerance or anti-ly solidify the inorganic noggin piece of the effect of strain, the flexible cross-linked rubber minuteness particle of distortion when improving stress application adds.

In view of forming the fact that can realize enough stable on heating cross-linked structures etc., comprise the epoxy resin of two or more epoxy radicals in the preferred molecule.In addition,, preferably have four or still less in view of the fact with low viscous resin combination can be provided, and the epoxy resin with three or epoxy radicals still less.When the epoxy radix in being included in molecule was too small, the thermotolerance of cured product was tended to deterioration, and its intensity is tended to die down.On the other hand, when the epoxy radix was excessive, the viscosity of resin combination was tended to increase, and will be tended to increase by the contraction that curing causes.

In addition, in view of the balance of physical characteristics, the number-average molecular weight of epoxy resin is preferably 200 to 5500, especially is 200 to 1000.When number-average molecular weight was too small, the intensity of cured product was tended to die down, and humidity resistance is tended to reduce.On the other hand, when number-average molecular weight was excessive, the viscosity of resin combination was tended to increase, and the using tendency of reaction diluent that is used to regulate operability is in increase.

In addition, in view of the combined amount of hardening agent reaches the fact of OK range etc., the equivalents of epoxy resin is preferably 100 to 2800, and more preferably 100 to 500.When epoxide equivalent was too small, the combined amount of hardening agent was tended to excessive, and the physical characteristics of cured product is tended to deterioration.On the other hand, when epoxide equivalent was excessive, the combined amount of hardening agent was tended to reduce, and the viscosity of resinous principle is owing to the increase of the molecular weight of epoxy resin itself is tended to increase.

As epoxy resin, for example can mention the multipolymer with other polymkeric substance, such as bisphenol A type epoxy resin, bisphenol f type epoxy resin, bisphenol-A D type epoxy resin, naphthalene type epoxy resin, biphenyl type epoxy resin, glycidyl amine type epoxy resin, cycloaliphatic epoxy resin, dicyclopentadiene type epoxy resin, phenol thermoplastics type epoxy resin, the epoxy resin of polyester modification, the epoxy resin of silicones modification.In these multipolymers, preferred bisphenol A type epoxy resin, bisphenol f type epoxy resin, bisphenol-A D type epoxy resin, naphthalene type epoxy resin, phenol thermoplastics type epoxy resin etc., it is former because these resin viscosity are lower, and the cured product of this resin has good thermotolerance and moisture resistance.

Can use the amido hardening agent, the polyamide-based hardening agent, the anhydride group hardening agent, latent curing agents etc. are as this hardening agent.

The amido hardening agent is an amines, and obstructed overcuring reaction forms ester bond, so this amido hardening agent has good moisture resistance than the situation of utilizing acid anhydride base hardening agent, and therefore this situation is preferred.Though amines can be a fatty amine, any in aliphatic cyclic amine and the aromatic amine, aromatic amine most preferably, it is former because aromatic amine has high room storage stability and high cured product thermotolerance.Aromatic amine specifically be exemplified as 3,3 '-diethyl-4,4 '-diaminodiphenylmethane, 3,5-diethyl-2, the 6-toluene diamine, 3,5-diethyl-2,4-toluene diamine, 3,5-diethyl-2,6-toluene diamine and 3,5-diethyl-2, the potpourri of 4-toluene diamine etc.

The polyamide-based hardening agent also can be described as daiamid, and the compound for having a plurality of active amines and have one or more similar amide group in molecule.Because the imidazolidine ring forms by auxiliary heating, and compatibility and mechanical property with epoxy resin have been improved, so the preferred polyamide-based hardening agent that synthesizes by polyethylene polyamine.The polyamide-based hardening agent can be in advance the adduct type that reacts with a small amount of epoxy resin, and because the polyamide-based hardening agent is the adduct type, event has the good compatibility with epoxy resin, and improves curing performance and waterproof/chemical resistance, and therefore this situation is preferred.By utilizing the polyamide-based hardening agent, flexible king-sized tough and tensile cured resin is by making with the crosslinked of epoxy resin, so resin has the required good resistance to sudden heating of magnetic coder of the present invention, and therefore this situation is preferred.

At high temperature have good thermotolerance and good mechanical property and electrical properties by solidifying the cured product that constitutes by the anhydride group hardening agent.On the other hand, described cured product tends to slightly fragile, and this can improve by combining with curing accelerator of tertiary amine etc.The example of anhydride group hardening agent can be acid phthalic anhydride, methyl tetrahydro phthalic anhydride, end-methylene THPA, methylene-end-methylene hydrogenation phthalic anhydride, methyl hexahydrophthalic anhydride, trimellitic anhydride etc.

Latent curing agent has good storage stability at normal temperatures, and with system that epoxy resin mixes in be equal to or higher than under the condition of constant temperature and solidifying fast.Embodiment as reality, the latent curing agent that is activated when to exist in neutral salt maybe can be the compound heating of the acidity of epoxy curing agent or alkali compounds, by crystalline material heating and dissolving, have high-melting-point and at room temperature not with the compatible mutually latent curing agent of epoxy resin etc.The concrete example of latent curing agent can be 1, two (diazanyl carbon the ethyl)-5-isopropyl hydantoins of 3-, eicosane diacid two hydrazides, AH, dicyandiamide, 7,11-octadecane diene-1,18-two carbohydrazides etc.In these latent curing agents, 7,11-octadecane diene-1,18-two carbohydrazides are by becoming flexible king-sized tough and tensile cured resin with epoxy resin is mutually crosslinked, by this latent curing agent is used as hardening agent, thereby described resin has the required good resistance to sudden heating of magnetic coder of the present invention, and therefore this situation is preferred.

The tert-butyl-phenyl glycidol ether, 2-ethylhexyl glycidol ether, allyl glycidyl ether, phenyl glycidyl ethers etc. can be used as reaction diluent, and can be by adding reaction diluent provide appropriate flexible for cured product.Yet when using reaction diluent in large quantities, the moisture resistance of cured product or thermotolerance be deterioration, so reaction diluent is preferably 30wt% or littler with respect to the adding rate of the epoxy resin that constitutes main matter, more preferably 20wt% or littler.

Preferred this curing accelerator has enough storage stabilities, and at normal temperatures not as curing accelerator, and is cured reaction fast when temperature becomes 100 ℃ or higher high temperature.For example, the compound that in molecule, has one or more ester bonds that the reaction by 1-alkoxyethanol and carboxylic acid etc. forms.This compound is for example represented by general formula (4):

R ²[COO-CH(OR ¹)-CH ₃] _n (4)

R wherein ²Be to have 2 to 10 carbon atoms and comprise one or more n valency alkyl in nitrogen-atoms, the oxygen atom etc., R ¹Be to have 1 to 6 carbon atom and comprise one or more monovalence alkyl in nitrogen-atoms, the oxygen atom etc., n is 1 to 6 integer.The compound that specifically is exemplified as following general formula (5) expression of this compound:

[chemical formula 4]

R wherein ²Be divalence phenyl and R ¹Be the compound of propyl group, R ²Be phenenyl and R ¹Be the compound of propyl group, R ²Be tetravalence phenyl and R ¹It is compound of propyl group etc.Above-claimed cpd can use separately or two or more compounds are used in combination.In these compounds, in view of the balance between solidification reactivity and the storage stability, the compound of general formula (5) expression most preferably.

Except that above-claimed cpd, such as glyoxal ethyline, 2-ethyl-4-methylimidazole, the 2-undecyl imidazole, the imidazolium compounds of 2-phenylimidazole etc. can be used as curing accelerator.

In addition, for curing accelerator, can be used as such as the carboxylic acid of hexane diacid and to have reactive hydrogen and react to produce the compound of ring-opening reaction with epoxy radicals.When using hexane diacid, the epoxy radicals of hexane diacid and epoxy resin and the amino of hardening agent react, and the flexible addition with hexane diacid of the cured product of gained increases.Flexible in order to represent, the addition of hexane diacid is 10 to 40wt% with respect to the total amount of adhesive, and more preferably 20 to 30wt%.When addition less than 10wt%, do not have enough flexible.On the contrary, when addition surpassed 40wt%, the total amount of the epoxy resin in the adhesive was owing to addition reduces, Gu adhesion and physical strength reduce, therefore this situation is not preferred.

In addition, can add tertiary amine such as dimethyl benzyl amine as the catalyzer of the ring-opening reaction of quickening epoxy radicals, such as the quaternary ammonium salt of tetrabutylammonium bromide, such as 3-(3 ', 4 '-dichlorophenyl)-1, the ureine of 1-dimethyl urea is as curing accelerator.

The OH base that ring-opening reaction forms that passes through that comprises above-mentioned amine etc. forms hydrogen bond with hydroxyl on the surface of oil scraper ring, and amido link that can be by acting on the low water absorbable polyamide that constitutes bond material etc. is kept firm coherent condition.

For inorganic filler, can use any inorganic filler and be not specifically limited, as long as being tradition, this inorganic filler uses.Inorganic filler specifically be exemplified as fused quartz powder, quartz glass powder, glass ceramics powder/glass fibre, alumina powder, talcum, aluminium powder, titania etc.

The cross-linked rubber minuteness particle is preferably those with the functional group that can react with epoxy radicals, particularly, most preferably has the sulfurized nitrile rubber of carboxyl in strand.Dispersed and stable flexible for showing, more preferably smaller particle size, and most preferably mean grain size is about ultrafine particle of 30 to 200nm.

For above-mentioned single solution-type epoxy adhesive, be difficult to be cured at normal temperatures reaction, adhesive for example is issued to semi-cured state at about 80 to 120 ℃, carries out the heat curing reaction fully by heating under 120 to 180 ℃ high temperature.The adhesive that can adhere to most preferably by the high-frequency heating under about 180 ℃.

About the cured product after the heat curing of above-mentioned alkyd resin based adhesive or epoxy resin-matrix adhesive, for physical characteristics, the modulus of elasticity in static bending or Young modulus in 0.02 to 5GPa scope, more preferably in 0.03 to 4GPa scope, perhaps hardness (duarometer D level; HDD) in 40 to 90 scope, more preferably in 60 to 85 scope.When the modulus of elasticity in static bending or Young modulus less than 0.02GPa or hardness (HDD) less than 40 the time, adhesive itself is crossed soft and because the vibration that produces during the automobilism etc. etc. and easy deformation, so magnet part is moved easily.Therefore, worry that the degree of accuracy that detects rotation number reduces, so this situation is not preferred.On the other hand, when the modulus of elasticity in static bending or Young modulus greater than 5GPa or hardness (HDD) greater than 90 the time, adhesive is really up to the mark, this adhesive is difficult to be out of shape to absorb the difference of the linear expansion coefficient between magnet part and the oil scraper ring, and exist in the magnet part danger that produces crack etc. in the worst case, therefore this situation is not preferred.When automobile was used in supposition, adhesive of the present invention needed resistance to sudden heating, more preferably had the adhesive of flexible (when stress application time produce distortion) at solid state.

Except above-mentioned alkyd resin based adhesive and epoxy resin-matrix adhesive, can consider that selections such as employed environment, adhesion are used to adhere to the adhesive of magnet part and oil scraper ring.Other adhesives specifically be exemplified as resorcinol resin base adhesive, polyurethane resin-based adhesive, polyimide-based adhesive, polyetherimide amido adhesive, polyetheramide groups adhesive, Polyimidesiloxane base adhesive, polybenzimidazoles base adhesive, the silicon resin base adhesive, alpha-cyanoacrylate ester group adhesive, acrylic resin-based adhesive, the polyester-based adhesive, polyamide base adhesive, nitrile rubber base adhesive, neoprene base adhesive etc.

After being filled to magnetic material in the mould as described above, carry out demagnetization by the magnetic field of the edge direction opposite when in mould, cooling off with direction of magnetization.Next, after removing gate portions, the adhesive full solidification, utilize then demagnetizer such as oil condenser type demagnetizer with the further demagnetization of this material to 2mT or littler magnetic flux density, more preferably 1mT or littler magnetic flux density.

Next, excise this cast gate, for this adhesive of full solidification, the constant time of the described material of heated at constant temperature in thermostatic bath.Also can at high temperature advance to add short-term row heat according to environment by high-frequency heating etc.

Thereafter, this material overlaps on the magnetization hub carrying out the magnetization (see figure 3) of multipolar system, thereby obtains magnetic coder.Number of magnetic poles is about 70 to 130 magnetic poles, is preferably 90 to 120 magnetic poles.When number of magnetic poles during less than 70 magnetic poles, number of magnetic poles is too small and therefore be difficult to accurately detect rotation number.On the contrary, when number of magnetic poles during greater than 130 magnetic poles, corresponding spacing becomes too small, so this magnetic coder is difficult to suppress single interval error less, and practicality is lower.

At this, illustrate in an embodiment by utilizing oil scraper ring magnetic material to be carried out embedded mold pressing and make this magnetic coder, but oil scraper ring and magnet part can be made separately and utilize adhesive to combine as core.Consider thermotolerance and water resisting property, above-mentioned single solution-type epoxy radicals adhesive is suitable as the adhesive that uses this moment most, but the adhesive that adhesive not necessarily can utilize solvent to dilute.

In addition, when magnetic coder is used for hot and humid environment, preferably on the exposure of magnet part, form damp-proof membrane, so as to prevent Magnaglo because the suction and deterioration.When utilizing the rare-earth magnetic powder, this magnetic coder is especially effective.At this moment, noncrystalline fluorocarbon resin, the curable polyurethane resin, curable acrylic resin, curable epoxy, Parylene derivant etc. is suitable as the material of damp-proof membrane.Yet, in resin itself, have hydrophobic noncrystalline fluorocarbon resin and Parylene derivant and have the good effect that suppresses moisture immersion resin, especially preferred thus this noncrystalline fluorocarbon resin and Parylene derivant.

Noncrystalline fluorocarbon resin is the polymkeric substance that has fluorine-containing aliphatic ether ring structure in main chain, and especially by cyclopolymerization by the monomer of forming such as perfluoro (allyl vinethene) or perfluoro (butenyl group vinethene), perhaps by (a plurality of) monomer and such as tetrafluoroethene, chlorotrifluoroethylene, or the interpolymerization of the free radical polymerizable monomer of perfluoro (methyl vinyl ether) and obtaining.In order to improve the adhesiveness (adhesion property) to magnet part, noncrystalline fluorocarbon resin preferably has the structure of the functional group such as carboxyl being introduced end etc.In addition, noncrystalline fluorocarbon resin is dissolved in the perfluoro solvent such as perfluoro (2-butyl tetrahydrofuran), therefore be in about solution of 1 to 10wt% by immersing the meltage of noncrystalline fluorocarbon resin in the perfluoro solvent, and carry out drying subsequently, thereby suitably form this film.At this moment, thickness depends on the concentration of submergence solution, regulates this concentration suitably so that realize required thickness.In order to keep enough moisture resistances, thickness is preferably 0.1 to 10 μ m, more preferably 0.3 to 2 μ m.When thickness during, be difficult to stably form this thin film, and be difficult to the moisture resistance of guaranteeing that this film is enough less than 0.1 μ m.On the other hand, when thickness during greater than 10 μ m, moisture resistance does not change, and be difficult to be formed uniformly this thick film equally and cost higher, therefore this situation is not preferred.In order further to improve adhesiveness to magnet part, more effectively, after forming, film under about 100 to 120 ℃, carries out 0.5 to 2 hour thermal treatment, and perhaps carry out primary coat in advance and handle.

Curable polyurethane resin, curable acrylic resin and curable epoxy have in structure can be by the functional group of heat or ultraviolet curing.Thickness approximately equates with noncrystalline fluorocarbon resin.Because the curable polyurethane resin, itself does not have hydrophobicity curable acrylic resin and curable epoxy, and does not have good water proofing property, is inserted in structure between the film of being made up of these resins so have the metal deposited film.Aluminium, chromium, nickel etc. are suitable for this metalloid deposited film.Thickness is preferably 0.008 to 0.1 μ m, more preferably 0.01 to 0.05 μ m.When thickness during, be difficult to stably form this thin film, and be difficult to guarantee enough moisture resistances less than 0.008 μ m.When thickness during greater than 0.1 μ m, moisture resistance does not change on the other hand, and cost and weight will increase, and therefore this situation is not preferred.Yet, owing to be difficult to obtain enough film strengths and adhesiveness by direct formation metal deposited film, thus the preferable alloy deposited film between curable polyurethane resin, curable acrylic resin or curable epoxy as basal layer.

The Parylene derivant is by following chemical formula (6) expression, and by by (2,2) of chemical formula (7) expression the chemogenic deposit of paracyclophane compound being formed.

[chemical formula 5]

At this moment, in chemical formula (6) and (7), X ₁And X ₂All be hydrogen atom, low alkyl group, or halogen atom, and each other can be identical or different.In addition, the concrete example of the Parylene derivant of chemical formula (6) expression has Parylene, a poly-chloro P-xylene, poly-dichloro-P-xylene etc.The chlorine substituent of compound is many more, and thermotolerance is just high more.When supposing, more preferably have a poly-chloro P-xylene of about 120 ℃ maximum operating temperature commonly used and poly-dichloro-P-xylene with about 150 ℃ temperature in the following time of working temperature of magnetic coder.

In addition, wherein the compound of being fluoridized by the part hydrogen atom of the Parylene derivant of chemical formula (6) expression by following general formula (8) expression has about 250 ℃ very high maximum operating temperature commonly used, so this compound is preferred waterproof membrane.

[chemical formula 6]

The thickness of the film of being made up of the Parylene derivant is preferably 0.5 to 5 μ m.When thickness is difficult to guarantee enough moisture resistances during less than 0.5 μ m, even and when thickness during greater than 5 μ m, moisture resistance do not change and cost higher, therefore this situation is not preferred.

Below description is had as mentioned above the embodiment of the roller bearing unit of the magnetic coder that constitutes.

(first embodiment)

Fig. 1 is the cut-open view of an embodiment that expression has the roller bearing of magnetic coder, and Fig. 2 is near the zoomed-in view of presentation code device.Roller bearing 10 shown in the drawings has the outer shroud 11 that constitutes set collar; Constitute the interior ring 12 of swivel eye (rotating member); Constitute the ball 13 of a plurality of rolling elements, this rolling element is arranged in rotary manner by along the circumferential direction keeping equidistant between the annular gap of

outer shroud

11 and 12 separations of interior ring and by steady arm 14; Be arranged in annular gap the open end place water-tight equipment 15 and detect in the magnetic coder 20 of rotation number of ring 12.

Water-tight equipment 15 comprises the containment member 16 of the inner peripheral surface that is mounted to outer shroud 11 and is arranged on the outside of the open end outside the containment member 16 and the oil scraper ring 17 of the outer peripheral face of ring 12 in being fixed to.Water-tight equipment 15 is closed the open end of annular gap by the sliding contact between containment member 16 and the oil scraper ring 17, thereby prevents that foreign matter such as dust from invading bearing inside, and prevents that the lubricant that is seated in bearing inside from leaking.At this moment, containment member 16 utilizes core metal 18 reinforcement rubber seals 19 usually and constitutes, this rubber seal 19 forms with the toroidal that the cross section is essentially L shape shape, this core metal similarly is essentially the toroidal formation of L shape shape with the cross section, the leading section branch of rubber seal 19 becomes a plurality of sealing

lip

19a, 19b and 19c, the surperficial sliding contact of sealing lip and oil scraper ring 17.

Magnetic coder 20 forms ring 21 by oil scraper ring 17 and lateral surface (magnet faying face) magnetic pole that is attached to oil scraper ring 17 and constitutes, and is made up of magnet material, and magnetic pole forms ring 21 and utilizes oil scraper ring 17 to be fixed to interior ring 12 as fixed component.

Oil scraper ring 17 is by the formations such as thin plate of ferritic stainless steel (SUS430 etc.)/martensite (martensitic) stainless steel (SUS410 etc.), and have the column part 17a of ring 12 in outwards being engaged to and flange shape flange portion 17c, this flange portion 17c axially is attached to end and radially extension by sweep 17b along column part 17a's.It is multi-pole magnet shown in Figure 3 that magnetic pole forms ring 21, and the S utmost point and the N utmost point alternately form along the circumferencial direction that magnetic pole forms ring 21.The number of magnetic poles that magnetic pole forms ring 21 is about 70 to 130 magnetic poles, is preferably 90 to 120 magnetic poles.In addition, magnetic sensor (not shown in the accompanying drawings) forms ring 21 layouts with respect to magnetic pole.

In addition, small depression shown in Figure 4 and the outshot 17d magnet faying face place that is arranged on oil scraper ring 17.The small depression and the outshot 17d that exist on the magnet faying face form by the following method, only transcribe to press to the small recess that is arranged on the punch die surface and outstanding when the thin plate of magnet material is crushed between the punch die.Particularly, as shown in Figure 5, press 30 has: base portion 32, this base portion 32 has leader 31, this leader 31 be shaped as the cylinder that external diameter and the internal diameter of the column part 17a of oil scraper ring 17 equate substantially; Surface accuracy roughing punch die 33, this punch die 33 adopts the ring-type of the leader 31 that outwards is engaged to base portion 32 tops; With pressing mold 34, this pressing mold 34 adopts the ring-type that can move along the vertical direction above roughing punch die 33, and has the internal diameter that equates substantially with the external diameter of column part 17a.Small recess and outstanding 33a are arranged on the surface of roughing punch die 33.Preferred chemical corrosion, electrodischarge machining forms rod, and conducts such as processing type embossing processing are provided with the method for small recess and outstanding 33a.In addition, can handle as the method that forms recess and outstanding 33a by the roughening that shot blast etc. is carried out.

In addition, by downward driving pressing mold 34 pushing the thin plate that is arranged on the magnet material between roughing punch die 33 and the pressing mold 34, thereby between the inner peripheral surface of the outer peripheral face of leader 31 and pressing mold 34, form column part 17a.At this moment, the faying face of the thin plate by will forming oil scraper ring 17 is pressed to recess and the outstanding 33a that is arranged on the roughing punch die 33, in fact, higher outstanding part among main stamped recess and the outstanding 33a, depression and outshot 17d are formed on flat, the smooth part of recess and outstanding 33a.

The degree of depth of the sunk part of depression and outshot 17d is about 1 to 20 μ m, more preferably about 2 to 10 μ m.When the degree of depth of sunk part during less than 1 μ m, in order to make adhesive sunk part is produced anchorage effect, so this degree of depth is shallow excessively, not observing bounding force thus increases too much, so practicality is lower.When the degree of depth of recess part during greater than 20 μ m, must deepen to be arranged on the outshot on the punch die 33, when during pressing transcribing this outshot, worry exerts an influence to the tabular surface on the back side thus, so this situation is not preferred.

In addition, in oil scraper ring 17, though be not specifically limited the surface working state of the tabular surface except that the magnet faying face, but consider the sealing lip 19a of sliding contact with it, the erosion performance of 19b and 19c, the BA (Ra is about 0.06) of preferred BA No.2, the tabular surface of processing such as BA No.5 (Ra is approximately 0.03), the perhaps tabular surface of the AP of No.2B (Ra is about 0.06) processing, perhaps Ra is equal to or less than the tabular surface of 0.1 μ m.

Adhesive is applied to the magnet faying face of the oil scraper ring 17 of above-mentioned formation, and this adhesive arrives depression and outshot 17d, so the bounding force between magnet part 21 and the oil scraper ring 17 is strengthened by anchorage effect.

(second embodiment)

Fig. 6 is that expression is used to support the partial sectional view of Application Example that engaged wheel is in the wheel supporting roller bearing unit 100 of independent suspension.

The interior ring 107 of roller bearing unit 100 outwards is engaged to the minor diameter step part 106 at the inner end place that is formed on hub 103, and connect and be fixed to hub 103 by ca(u)lk part 109, this ca(u)lk part 109 becomes inner end with hub 103 to be widened to the outside along diametric(al) by ca(u)lk to form.Hub 103 and interior ring 107 constitute swivel eye (rotating member).In addition, this is taken turns by with predetermined space stud bolt 105 along the circumferential direction, thereby freely connects and be fixed to the connecting flange 104 at the place, outer end that is formed on hub 103 and from the outstanding part in outer end of the outer shroud 101 that constitutes set collar.On the contrary, outer shroud 101 is by being formed on freely connecting in conjunction with flange 111 and being fixed to the unshowned hook of accompanying drawing that constitutes suspension equipment etc. of its outer peripheral face place.A plurality of balls 112 by steady arm 113 guiding are arranged between outer shroud 101 and hub 103 and the interior ring 107 along peripheral direction in rotary manner.

In addition, each water-tight equipment 15,115 is separately positioned between the outer peripheral face of inner end of the outer peripheral face at middle part of the inner peripheral surface of two ends of outer shroud 101 and hub 103 and interior ring 106.Each water-tight equipment 15,115 blocks the space with corresponding ball 112 from the space outerpace between the outer peripheral face of the outer peripheral face of the inner peripheral surface of outer shroud 101 and hub 103 and interior ring 107.Magnetic pole forms ring 21 and is attached to the lateral surface of the oil scraper ring 17 that constitutes water-tight equipment 15 to constitute magnetic coder 20, embodiment as shown in Figure 1.In addition, magnetic sensor 114 is along the axial positioned opposite of the magnetic coder 20 of facing magnetic coder 20 outsides, the variation of sensor magnetic flux density, thereby the rotational speed of detection wheel.

(the 3rd embodiment)

Fig. 7 also is that expression is used to support the partial sectional view of Application Example that engaged wheel is in the wheel supporting roller bearing unit 100 of independent suspension, and Fig. 8 is near the enlarged drawing the expression magnetic coder.At this moment, the part that is equivalent to wheel supporting roller bearing unit 100 shown in Figure 6 has identical Reference numeral, and will not be described.

The supporting roller bearing unit 100 of taking turns shown in the drawings has following structure, promptly removes water-tight equipment 15 from wheel supporting roller bearing unit 100 shown in Figure 6, and should be sealed by sender unit cap 115 by wheel supporting roller bearing unit 100.Sender unit cap 115 is lid members that resin is made, and it cooperates for opening part so that center on outer shroud 101 coverings, and sensor 114 is fixed to sender unit cap 115.

(the 4th embodiment)

Fig. 9 has magnetic coder 20 and sensor 114 structure radially respect to one another.Magnetic coder 20 according to present embodiment, the circular oil scraper ring 17 that constitutes retaining element to fit on be fixed in the peripheral part of inner end of ring 107, the magnetic pole that constitutes magnet part forms and encircles 21 inner peripheral surfaces that are attached to the oil scraper ring 17 that extends vertically from interior ring 107.In addition, the outer peripheral face of outer shroud 101 is fixed with the covering member 115 that constitutes static component, is formed on the part of opening that hides member 115 places and is connected with radially with magnetic pole and forms the relative sensors 114 of ring 21.

According to this structure, than above-mentioned magnetic coder on the other side vertically, can increase the diameter of detection faces for identical space, therefore when the spacing number keeps identical, spacing width will increase accordingly, will make magnetic coder easily.

In addition, in the embodiment shown in the figures, magnetic coder 20 is arranged in axle head, but magnetic coder 20 can be arranged in (between two balls 112,112) between the circuit.When being arranged between the circuit, can consider that thermotolerance selects the material that will use suitably.In addition, when being arranged in a spool bridge place, can consider that water resisting property selects the material that will use suitably.In addition, in the embodiment shown in the figures, sensor 114 is arranged in the inside of magnetic coder 20, but sensor 114 can be arranged in the outside of magnetic coder 20.

The present invention is not limited to the foregoing description, and can carry out appropriate change or improvement.For example, as shown in figure 10, magnetic pole forms the radially type magnetization relatively that ring 21 can be into the V shape.At this moment, in V shape magnetic pole, left and (α β) can be identical, and the border of V shape magnetic pole is not limited to linear line, and can be sweep or wavy line at inclination angle to the right.In addition, Magnitizing method can be to repeat magnetized one pole magnetization at each electrode or a plurality of magnetic poles place or simultaneously all magnetic poles are carried out magnetized any in multipole magnetized.

In addition, as shown in figure 11, the shape of magnetic pole can be trapezoidal shape.In addition, in the 4th embodiment, as shown in figure 12, can use magnetized magnet part with trapezoidal shape.

Example

Below with reference to further limiting the present invention with comparative example.At this moment, in each test, make magnetic coder by following method.Made corresponding 10 magnetic encoders are placed the thermal shock test device, and repeat 30 minutes 120 ℃ and 30 minutes-40 ℃ cycle is heated this magnetic encoder, observe this magnet part to confirm whether there is the crack when per 50 cycles.

(test-1)

As shown in table 3, mediate Magnaglo and bond with the preparation magnetic material, this magnetic material forms toroidal to make magnet part, and the internal diameter of this toroidal is 66mm, and external diameter is 76mm, and thickness is 0.9mm.In addition, by ferritic stainless steel (SUS430) make and thickness be the plate-shaped of 0.7mm to become internal diameter be that 66mm and external diameter are the toroidal of 76mm, many degree of depth are that the sunk part of 10 to 20 μ m is formed on the magnet faying face to make the oil scraper ring (see figure 4).Then, magnet part and oil scraper ring utilize solution-type epoxy resin-matrix adhesive (Cemedine Co., Ltd. the Super X2 of Zhi Zaoing) adhering to each other, and place this magnet part and whole 24 hours of oil scraper ring so that the adhesive full solidification, thus make magnetic coder.The results are shown in the table 3 of thermal shock test.

[table 3]

	Example 1	Example 2	Comparative example 1
				Sr ferrite (wt%)	90	0	90
Nd-Fe-B(wt％)	0	80	0
				PPS(wt％)	7.0	15	9.7
Allyl sulfides acid rubber ultrafine particle (wt%)	2.7	4.7	0
				Silane coupling agent	0.3	0.3	0.3
Amount of bow (ASTM D790; T=3.2, room temperature)	6.0	7.5	1.5
				BHmax[KJ/m ³](MGOe)	15.1(1.9)	38.0(4.8)	15.1(1.9)
-40 ℃ of 30min of thermal shock test result (120 ℃ of 30min＜=〉)	1000 cycles do not have the crack	1000 cycles do not have the crack	There is the crack in 50 to 100 cycles

Sr ferrite: be used for the anisotropy Sr ferrite of field orientation, FERO TOPFM-201 (Toda Kogyo manufacturing)

Nd-Fe-B:Nd ₂Fe ₁₄(Magnequench makes the B/MQ powder, USA)

The pure toner W-220A of PPS:PPS (Kureha Chemical Industry Co., Ltd. makes)

Allyl sulfides acid rubber ultrafine particle: (mean grain size is 100 to 150nm to Narpow VP-301; Sanyo Trading Co., the Ltd. import)

Silane coupling agent: gamma-aminopropyl-triethoxy-silane, A-1100 (Nippon Unicar Co., Ltd. makes)

Shown in table 3 is clear, will be appreciated that, than the situation of only using polyphenylene sulfide, use bond to increase the amount of bow of material itself and improved splitting resistance by mixing vulcanized rubber ultrafine particle and polyphenylene sulfide gained, therefore improved resistance to sudden heating significantly.

(test-2)

Then, as shown in table 4, mediate Magnaglo and bond with the preparation magnetic material.In addition, utilize methyl ethyl ketone that alkyd resin based adhesive (the metalock N-15 that Toyo Kagaku Kenkyusho makes) is diluted three times with preparation adhesive solution, this alkyd resin based adhesive comprises 30% solid state component, and the principal ingredient of this solid state component is made of the thermal plastic phenolic resin.Oil scraper ring is immersed in the adhesive solution, and this oil scraper ring is that 66mm and external diameter are the toroidal of 76mm and by shot-peening the uneven surface that the roughening of magnet faying face turns to Ra1.2 are formed by being become internal diameter by the plate-shaped that ferritic stainless steel (SUS430) makes.After at room temperature dry 30 minutes, oil scraper ring was placed in 120 ℃ the hothouse 30 minutes, so that therefore curing this adhesive is in semi-cured state.

Thereafter, the oil scraper ring that utilizes core and adhesive to be cured to semi-cured state carries out embedded mold pressing (the plate-like cast gate of interior circumferential portion) to magnetic material.After molded, excise this cast gate immediately, subsequently 150 ℃ of following auxiliary heating 1 hour with this adhesive of full solidification, therefore obtaining internal diameter is that 66mm, external diameter are that 76mm, magnet part thickness are the magnetic coder of 0.9mm.The results are shown in the table 4 of thermal shock test.

[table 4]

	Example 3	Example 4	Example 5	Example 6	Comparative example 2
						The Sr ferrite	89.5	0	89.5	0	90
Nd-Fe-B	0	80	0	80	0
						PBT	7	15	0	0	9.7
PBN	0	0	7	15	0
						The PBT of modification	3	0	0	0	0
The PBN of modification	0	0	3	0	0
						Sulfuration ACM ultrafine particle	0	4.5	0	0	0
The acid modified EPDM	0	0	0	4.5	0
						Silane coupling agent	0.3	0.3	0.3	0.3	0.3
Antioxidant	0.2	0.2	0.2	0.2	0
						(ASTMD 790 for amount of bow; T=3.2, room temperature)	5.2	7.2	5.5	6.7	1.3
BHmax[KJ/m ³](MGOe)	14.8(1.9)	38.0(4.8)	14.8(1.9)	37.9(4.8)	15.1(1.9)

-40 ℃ of 30min of thermal shock test result (120 ℃ of 30min＜=〉)

1000 cycles do not have the crack

There is the crack in 50 to 100 cycles

The note combined amount is based on the quantity (wt%) of magnetic material total amount

Nd-Fe-B:Nd ₂Fe ₁₄B, MQ powder (Magnequench, USA makes)

PBT: contain the polybutylene terephthalate of thermal stabilizer, Duranex2020U (Polyplastics Co., Ltd. makes)

PBN: PBN, TQB-OT (Teijin Chemicals Ltd. manufacturing)

Acid modified EPDM: maleic anhydride-modified EPDM, Royal Tough498 (Shiraishi Calcium Kaisha Ltd. manufacturing)

Silane coupling agent: gamma-aminopropyl-triethoxy-silane, A-1100 (NipponUnicarCo., Ltd. makes)

Antioxidant: N, N '-biphenyl-p-phenylenediamine (PPD), Nocrack DP (Ouchi ShinkoChemical Industrial Co., Ltd. makes)

Shown in table 4 is clear, will be appreciated that, use has increased the amount of bow of material itself and has improved splitting resistance as the polyester-based resin of the modification of impact resistance improver or the bond of rubber particles and polyester-based fat gained by mixing, has therefore improved resistance to sudden heating significantly.

(test-3)

Then, as shown in table 5, mediate Magnaglo and bond with the preparation magnetic material.In addition, utilize methyl ethyl ketone that alkyd resin based adhesive (the metalock N-15 that Toyo KagakuKenkyusho makes) is diluted three times with preparation adhesive solution, this alkyd resin based adhesive comprises 30% solid state component, and the principal ingredient of this solid state component is made of the thermal plastic phenolic resin.Oil scraper ring is immersed in the adhesive solution, and this oil scraper ring will be by being made and thickness is that to become internal diameter be that 66mm and external diameter are the toroidal of 76mm and form by the uneven surface of shot-peening with the coarse Ra1.2 of turning to of magnet faying face for the plate-shaped of 0.6mm by ferritic stainless steel (SUS430).After at room temperature dry 30 minutes, oil scraper ring was placed in 120 ℃ the hothouse 30 minutes, is in semi-cured state thereby cure adhesive.

Utilize core magnetic material and adhesive cured to the oil scraper ring of semi-cured state and carry out embedded mold pressing (the plate-like cast gate of interior circumferential portion) thereafter.After molded, excise this cast gate immediately, subsequently 150 ℃ of following auxiliary heating 1 hour with this adhesive of full solidification, therefore obtaining internal diameter is that 66mm, external diameter are that 76mm, magnet part thickness are the magnetic coder of 0.9mm.The results are shown in the table 5 of thermal shock test

[table 5]

	Example 7	Example 8	Example 9	Example 10	Comparative example 3
						The Sr ferrite	89.5	0	89.5	0	90
Nd-Fe-B	0	80	0	80	0
						PA6	7.0	0	7.0	0	9.7
PA66	0	15	0	0	0
						PA46	0	0	0	10	0
PA612	0	5	0	0	0
						The PA6T of modification	0	0	0	5	0
The PA6 of modification	3.0	0	0	0	0
						Sulfuration X-NBR ultrafine particle	0	4.5	0	0	0
Sulfuration ACM ultrafine particle	0	0	0	4.5	0
						The acid modified EPDM	0	0	3.0	0	0
Silane coupling agent	0.3	0.3	0.3	0.3	0.3
						Antioxidant	0.2	0.2	0.2	0.2	0
Amount of bow (AsTM D790; T=3.2, room temperature)	5.8	8.2	6.5	7.8	1.5

BHmax[KJ/m ³](MGOe )	14.8(1.9)	38.0(4.8)	14.8(1.9)	37.9(4.8)	15.1(1.9)
						-40 ℃ of 3.0min of thermal shock test result (120 ℃ of 30min＜=〉)	1000 cycles do not have the crack	1000 cycles do not have the crack	1000 cycles do not have the crack	1000 cycles do not have the crack	There is the crack in 50 to 100 cycles

Nd-Fe-B:Nd ₂Fe ₁₄B, MQ powder (Magnequench, USA makes)

PA6:UBE nylon P1013 (Ltd. makes for powdered product, Ube Industries)

PA66:UBE nylon P2020 (Ltd. makes for powdered product, Ube Industries)

PA46:Stanyl TW341 (comprise the amido antioxidant, DJEP makes)

PA612:Zaitel 153HSL (comprise the phenol-based anti-oxidants of being obstructed, DuPont makes)

The PA6T:PA6T/66 of modification, Arrene AE4200 (Mitsui Chemicals Inc. manufacturing)

The PA6 of modification: have the PA6 of soft chain segment, glyron EXL ELX50HNZ (EmsShowa Denko, KK makes)

Sulfuration X-NBR ultrafine particle: vulcanize carboxyl acid modified NBR,

(mean grain size is 50 to 100nm to Narpow VP-301; Sanyo Trading Co., the Ltd. import)

Acid modified EPDM: maleic anhydride-modified EPDM, Royal Tough 498 (ShiraishiCalcium Kaisha Ltd. manufacturing)

Shown in table 5 is clear, will be appreciated that, use has increased the amount of bow of material itself and has improved splitting resistance as the polyamide of the modification of impact resistance improver or the bond of rubber particles and polyamide gained by mixing, has therefore improved resistance to sudden heating significantly.

(test-4)

Then, as shown in Figure 6, mediate Magnaglo and bond with the preparation magnetic material.In addition, utilize methyl ethyl ketone that alkyd resin based adhesive (the metalock N-15 that Toyo Kagaku Kenkyusho makes) is diluted three times with preparation adhesive solution, this alkyd resin based adhesive comprises 30% solid state component, and the principal ingredient of this solid state component is made of the thermal plastic phenolic resin.The oil scraper ring (see figure 4) is immersed in the adhesive solution, and this oil scraper ring will be by being made and thickness is that to become internal diameter be that 66mm and external diameter are the toroidal of 76mm and further to suppress this plate be that the sunk part of 10 to 20 μ m forms to form a plurality of degree of depth on the faying face of magnet for the plate-shaped of 0.6mm by ferritic stainless steel (SUS430).After at room temperature dry 30 minutes, oil scraper ring was placed in 120 ℃ the hothouse 30 minutes, thereby adhesive is cured to semi-cured state.

Thereafter, the oil scraper ring that utilizes core and adhesive to be cured to semi-cured state carries out embedded mold pressing (the plate-like cast gate of interior circumferential portion) to magnetic material.After molded, excise this cast gate immediately, subsequently 150 ℃ of following auxiliary heating 1 hour with this adhesive of full solidification, be that 76mm, magnet part thickness are the magnetic coder of 0.9mm thereby the acquisition internal diameter is 66mm, external diameter.The results are shown in the table 6 of thermal shock test.

[table 6]

	Example 11	Example 12	Example 13	Example 14	Comparative example 4
						The Sr ferrite	89.5	0	89.5	0	90
Nd-Fe-B	0	80	0	80	0
						PA12	7.0	0	0	0	9.7
PA612	0	15	0	0	0
						PAMXD6	0	0	7.0	0	0
The PA6T of modification	0	0	0	15	0
						The PA12 of modification	3.0	0	0	0	0
Sulfuration X-NBR ultrafine particle	0	0	3.0	0	0
						Sulfuration ACM ultrafine particle	0	4.5	0	4.5	0
Silane coupling agent	0.3	0.3	0.3	0.3	0.3
						Antioxidant	0.2	0.2	0.2	0.2	0
Amount of bow (ASTM D790; T=3.2, room temperature)	6.0	8.0	5.5	7.5	1.5
						BHmax[KJ/m ³](MGOe)	14.8(1.9)	38.0(4.8)	14.8(1.9)	37.9(4.8)	15.1(1.9)

-40 ℃ of 3.0min of thermal shock test result (120 ℃ of 30min＜=〉)

1000 cycles do not have the crack

There is the crack in 50 to 100 cycles

Nd-Fe-B:Nd ₂Fe ₁₄B, MQ powder (Magnequench, USA makes)

PA12:PA12 powder P3012U (comprise the phenol-based anti-oxidants of being obstructed, UbeIndustries, Ltd. makes)

PAMXD6:Reny NX5001 (Mitsubishi Engineering-PlasticsCorporation manufacturing)

The PA12:UBEPAE 1210U of modification (comprise the phenol-based anti-oxidants of being obstructed, UbeIndustries, Ltd. makes)

Sulfuration X-NBR ultrafine particle: vulcanize carboxyl acid modified NBR, (mean grain size is 50 to 100nm to Narpow VP-301; Sanyo Trading Co., the Ltd. import)

Shown in table 6 is clear, will be appreciated that, use has increased the amount of bow of material itself and has improved splitting resistance as the polyamide of the modification of impact resistance improver or the bond of rubber particles and polyamide gained by mixing, has therefore improved resistance to sudden heating significantly.

(test-5)

Then, as shown in Figure 7, mediate Magnaglo and bond with the preparation magnetic material.In addition, utilize methyl ethyl ketone that alkyd resin based adhesive (the metalock N-15 that Toyo Kagaku Kenkyusho makes) is diluted three times with preparation adhesive solution, this alkyd resin based adhesive comprises 30% solid state component, and the principal ingredient of this solid state component is made of the thermal plastic phenolic resin.Oil scraper ring is immersed in the adhesive solution, and this oil scraper ring will be by being made and thickness is that to become internal diameter be that 66mm and external diameter are the toroidal of 76mm and further form by the uneven surface (material roughness is the seal sliding surface side of Ra0.08) of shot-peening with the coarse Ra0.8 of turning to of magnet faying face for the plate-shaped of 0.6mm by ferritic stainless steel (SUS430).After at room temperature dry 30 minutes, oil scraper ring was placed in 120 ℃ the hothouse 30 minutes, is in semi-cured state thereby cure adhesive.

Thereafter, the oil scraper ring that utilizes core and adhesive to be cured to semi-cured state carries out embedded mold pressing (the plate-like cast gate of interior circumferential portion) to magnetic material.After molded, excise this cast gate immediately, subsequently 150 ℃ of following auxiliary heating 1 hour with this adhesive of full solidification, therefore obtaining internal diameter is that 66mm, external diameter are that 76mm, magnet part thickness are the magnetic coder of 0.9mm.The results are shown in the table 7 of thermal shock test.

[table 7]

	Example 15	Example 16	Example 17	Example 18	Comparative example 5	Reference example 1	Reference example 2
								The Sr ferrite	89.5	0	89.5	0	90	89.5	89.5
Nd-Fe-B	0	80	0	80	0	0	0
								PA12	7	0	0	0	9.7	7.1	7
PA612	0	15	0	0	0	0	0

PAMXD6	0	0	7	0	0	0	0
								The PA6T of modification	0	0	0	15	0	0	0
The PA12 of modification	3	0	0	0	0	3.1	3
								Sulfuration X-NBR ultrafine particle	0	0	3	0	0	0	0
Sulfuration ACM ultrafine particle	0	4.5	0	4.5	0	0	0
								Silane coupling agent	0.3	0.3	0.3	0.3	0.3	0.3	0.3
The amido antioxidant	0.2	0.2	0.2	0.2	0	0	0
								The phenylol antioxidant	0	0	0	0	0	0	0.2
Amount of bow (ASTM D790; T=3.2, room temperature)	6.0	8.0	5.5	7.5	1.5	6.1	6.0
								BHmax[KJ/m ³](MGOe)	14.8(1.9)	38.0(4.8)	14.8(1.9)	37.9(4.8)	15.1(1.9)	14.8(1.9)	14.8(1.9)
-40 ℃ of 30min of thermal shock test result (120 ℃ of 30 min＜=〉)	1000 cycles do not have the crack	1000 cycles do not have the crack	1000 cycles do not have the crack	1000 cycles do not have the crack	There is the crack in 50 to 100 cycles	There is the crack in 200 to 300 cycles	There is the crack in 600 to 800 cycles

Nd-Fe-B:Nd ₂Fe ₁₄B, MQ powder (Magnequench, USA makes)

PA12:P3012U (powdered product comprises the phenol-based anti-oxidants of being obstructed, UbeIndustries, Ltd. makes)

PAMXD6:Reny NX5001 (Mitsubishi Engineering-PlasticsCorporation manufacturing)

Sulfuration ACM rubber ultrafine particle: allyl sulfides acid rubber, (mean grain size is 100 to 150nm to Narpow VP-301; Sanyo Trading Co., the Ltd. import)

Amido antioxidant: N, N '-biphenyl-p-phenylenediamine (PPD), Nocrack DP (Ouchi ShinkoChemical Industrial Co., Ltd. makes)

Phenylol antioxidant: triethylene glycol-two [3-(the 3-tert-butyl group-5-methyl-4-hydroxyphenyl) propionate], IRGANOX245 (Chiba Specialty Chemicals manufacturing)

Shown in table 7 is clear, situation for example, will be appreciated that, use by mixing impact resistance improver (polyamide of modification or rubber particles) and bond with amido antioxidant gained of low water absorbable polyamide to have increased the amount of bow of material itself and improved splitting resistance, thereby improved resistance to sudden heating significantly.

Especially in example 15 to 18, even when using the polyamide of low water absorbable, than the comparative example 5 that does not mix the impact resistance improver, or the reference example 1 of not mixing the amido antioxidant, or the reference example 2 of mixing the antioxidant (phenol-based anti-oxidants) except the amido antioxidant, improved resistance to sudden heating greatly.

The Japanese patent application No.2005-137307 that the application submitted to based on May 10th, 2005, the Japanese patent application No.2005-151395 that on May 24th, 2005 submitted to, the Japanese patent application No.2005-180669 that on June 21st, 2005 submitted to, the content of above-mentioned patented claim is hereby incorporated by.

Claims

1. magnetic coder, it comprises:

Magnet part, this magnet part comprises that by circumferential ground layout Magnaglo and the magnetic material that is used for the bond of described Magnaglo form, wherein

Described bond comprises

The thermoplastic resin that constitutes by polyamide; With

By the impact resistance improver that segmented copolymer is made, this segmented copolymer is the polyamide with modification of the hard segment that is made of polyamide and at least a soft chain segment that constitutes in polyethers and the polyester, and

The addition of described impact resistance improver is 5 to 60wt% with respect to the total amount of impact resistance improver and thermoplastic resin.

2. magnetic coder comprises:

Magnet part, this magnet part arranges that by circumferential ground comprising Magnaglo forms with the magnetic material that is used for the bond of this Magnaglo,

Wherein said bond comprises:

The thermoplastic resin that constitutes by polyamide;

By the impact resistance improver that the vulcanized rubber particle constitutes, this vulcanized rubber particle is made of at least a in acrylic rubber, nitrile rubber, carboxy-modified nitrile rubber, silicon rubber, hydrogenated nitrile-butadiene rubber and the carboxy-modified hydrogenated nitrile-butadiene rubber,

The mean grain size of wherein said rubber particles is 30 to 300nm,

Wherein, the addition of described impact resistance improver is 5 to 60wt% with respect to the total amount of impact resistance improver and thermoplastic resin.

3. magnetic coder according to claim 1 and 2,

The polyamide of wherein said thermoplastic resin is at least a in the polyamide of polyamide 6, polyamide 66 and polyamide 46.

4. magnetic coder according to claim 1 and 2,

The polyamide of wherein said thermoplastic resin is at least a among polyamide 6 T (PA6T), polyamide 9T (PA9T), the polyamide MXD6 (PAMXD6) of polyamide 12 (PA12), polyamide 11 (PA11), polyamide 6 12 (PA612), polyamide 6 10 (PA610), modification.

5. magnetic coder as claimed in claim 1 or 2, wherein

Described bond also comprises the aromatic amino antioxidant.

6. magnetic coder comprises:

Wherein said bond comprises:

The thermoplastic resin that constitutes by polyphenylene sulfide;

The impact resistance improver that constitutes by the vulcanized rubber particle, this vulcanized rubber particle is made of at least a in styrene-butadiene rubber, acrylic rubber, nitrile rubber, carboxy-modified nitrile rubber, silicon rubber, neoprene, hydrogenated nitrile-butadiene rubber, carboxy-modified hydrogenated nitrile-butadiene rubber and the carboxy-modified styrene-butadiene rubber

The mean grain size of wherein said rubber particles is 30 to 300nm,

Wherein, the addition of described impact resistance improver is 5 to 30wt% with respect to the total amount of impact resistance improver and thermoplastic resin.

7. magnetic coder comprises:

Wherein said bond comprises:

The thermoplastic resin that constitutes by vibrin;

By the impact resistance improver that segmented copolymer constitutes, this segmented copolymer is the polyester-based resin with modification of the hard segment that is made of polyester-based resin and at least a soft chain segment that constitutes in polyethers and the polyester,

The addition of described impact resistance improver is 5 to 50wt% with respect to the total amount of impact resistance improver and thermoplastic resin.

8. magnetic coder comprises:

Wherein said bond comprises:

The thermoplastic resin that constitutes by vibrin;

The mean grain size of wherein said rubber particles is 30 to 300nm,

9. roller bearing unit, it comprises:

Set collar;

Swivel eye;

Along the circumferential direction be arranged in a plurality of rolling elements between described set collar and the described swivel eye in rotary manner; With

According to claim 1, the magnetic coder of each in 2,6,7 and 8, wherein

Described magnet part utilizes adhesive to be fixed to the oil scraper ring of being made up of magnetic material, and

Described oil scraper ring is fixed to described swivel eye.