JP2021008941A - Protective cover having sensor holder part, bearing device having the protective cover, manufacturing method of protective cover having sensor holder part - Google Patents

Protective cover having sensor holder part, bearing device having the protective cover, manufacturing method of protective cover having sensor holder part Download PDF

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JP2021008941A
JP2021008941A JP2019123937A JP2019123937A JP2021008941A JP 2021008941 A JP2021008941 A JP 2021008941A JP 2019123937 A JP2019123937 A JP 2019123937A JP 2019123937 A JP2019123937 A JP 2019123937A JP 2021008941 A JP2021008941 A JP 2021008941A
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protective cover
sensor
magnetic
bearing
partition wall
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豊 上願
Yutaka JOGAN
豊 上願
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Nakanishi Metal Works Co Ltd
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Abstract

To fulfill a required specification on a thermal shock resistance and a calcium chloride resistance while suppressing increase of a manufacturing cost in a protective cover having a sensor holder section provided with a partition wall between a magnetic encoder and a magnetic sensor.SOLUTION: A cup shaped protective cover is attached to an outer ring of a bearing so as to seal an inner right side end of the bearing. The protective cover includes a synthetic resin disk part 2 and a synthetic resin sensor holder part 4 projecting from the disk part 2 inwardly. A partition wall 5 separating the magnetic encoder and the magnetic sensor is formed to the disk part 2. A protective film layer 10 is provided to a surface 5A, facing the magnetic sensor, of the partition wall 5. The protective film layer 10 protects the partition wall 5 having a thin thickness being a weak point of the calcium chloride resistance.SELECTED DRAWING: Figure 3A

Description

本発明は、軸受の外輪に取り付けて磁気エンコーダを被うカップ状の保護カバーにおいて、特に磁気センサを保持するセンサホルダ部を有する保護カバーに関わり、さらに詳しくは、磁気エンコーダ及び磁気センサ間に仕切壁を設けた保護カバーに関する。 The present invention relates to a cup-shaped protective cover that is attached to the outer ring of a bearing and covers a magnetic encoder, particularly relating to a protective cover having a sensor holder portion that holds a magnetic sensor, and more particularly, a partition between the magnetic encoder and the magnetic sensor. Regarding protective covers with walls.

自動車において、車輪のロックを無くして効率良く安全に制動するアンチロックブレーキシステムが広く普及している。前記アンチロックブレーキシステムは、例えば、回転速度検出装置（車輪速センサ）により各車輪の回転速度を検出し、制御装置により加速度及び減速度を演算するとともに車体速度とスリップ率を推定し、その結果に基づいてアクチュエータを駆動してブレーキ液圧の制御を行うものである。 In automobiles, an anti-lock braking system that eliminates wheel locks and brakes efficiently and safely is widely used. In the anti-lock braking system, for example, the rotation speed detection device (wheel speed sensor) detects the rotation speed of each wheel, the control device calculates acceleration and deceleration, and estimates the vehicle body speed and slip ratio. The brake hydraulic pressure is controlled by driving the actuator based on the above.

前記回転速度検出装置を自動車のホイール支持用の転がり軸受（ハブベアリング）に備えた軸受装置も広く用いられている。このような軸受装置において、Ｎ極とＳ極を一定間隔で周方向に交互に並べた磁気エンコーダを軸受の軸方向の一端部の内輪に取り付け、カップ状の保護カバーを軸受の軸方向の一端部の外輪に取り付けて密封するものがある（例えば、特許文献１〜３参照）。 Bearing devices equipped with the rotational speed detection device in rolling bearings (hub bearings) for supporting wheels of automobiles are also widely used. In such a bearing device, a magnetic encoder in which N poles and S poles are alternately arranged at regular intervals in the circumferential direction is attached to the inner ring of one end in the axial direction of the bearing, and a cup-shaped protective cover is attached to one end in the axial direction of the bearing. Some are attached to the outer ring of the portion and sealed (see, for example, Patent Documents 1 to 3).

特許文献１〜３の保護カバーは、磁気エンコーダに対向する磁気センサを保持するセンサホルダ部を有し、前記センサホルダ部を含む本体部分は合成樹脂製である。これらの保護カバーは射出成形により製造される。 The protective covers of Patent Documents 1 to 3 have a sensor holder portion for holding a magnetic sensor facing the magnetic encoder, and a main body portion including the sensor holder portion is made of synthetic resin. These protective covers are manufactured by injection molding.

前記センサホルダ部を含む本体部分の合成樹脂について、特許文献１には、ＰＰＳ（ポリフェニレンサルファイド）、ＰＡ（ポリアミド）６６、ＰＡ６・１２、ＰＰＡ（ポリフタルアミド）、ＰＢＴ（ポリブチレンテレフタレート）の例示がある。 Regarding the synthetic resin of the main body including the sensor holder, Patent Document 1 exemplifies PPS (polyphenylene sulfide), PA (polyamide) 66, PA6.12, PPA (polyphthalamide), and PBT (polybutylene terephthalate). There is.

同様に、特許文献２には、ポリアミド（ナイロン６，ナイロン６６，ナイロン６１２等）、ＰＰＳ、ＰＢＴの例示がある。 Similarly, Patent Document 2 exemplifies polyamides (nylon 6, nylon 66, nylon 612, etc.), PPS, and PBT.

特許文献３は、前記センサホルダ部を含む本体部分の合成樹脂として、低吸水性に加えて塩化カルシウムに対する耐性にも優れ、降雪地方での使用にも十分に耐え得るようにするために、数平均分子量で１３０００〜３００００であるポリアミド４１０樹脂を用いている。 Patent Document 3 describes a number of synthetic resins for the main body including the sensor holder, in order to have low water absorption, excellent resistance to calcium chloride, and sufficient resistance to use in snowy regions. A polyamide 410 resin having an average molecular weight of 13,000 to 30,000 is used.

特許文献１〜３の保護カバーは、磁気エンコーダ及び磁気センサ間に、仕切壁（特許文献１の底部２２ａ、特許文献２の仕切壁Ｂ、特許文献３の図３の凹部１４ｂにセンサ１３の先端部を収容した例を参照）を設けている。 The protective cover of Patent Documents 1 to 3 has a partition wall (bottom 22a of Patent Document 1, partition wall B of Patent Document 2, and a recess 14b of FIG. 3 of Patent Document 3 at the tip of the sensor 13) between the magnetic encoder and the magnetic sensor. (See the example of accommodating the part) is provided.

特開２０１６−１７０００１号公報Japanese Unexamined Patent Publication No. 2016-170001 特開２０１７−０１５２４６号公報JP-A-2017-015246 特開２０１５−０４５３５０号公報JP 2015-045350

自動車のホイールを支持する軸受装置の保護カバーは、風雪や風雨、炎天下等にも晒され、−４０℃〜１２０℃程度の温度変化が大きい環境で使用されるとともに、塩化カルシウムを主成分とする融雪剤等が付着することもある。
よって、前記保護カバーには、熱衝撃耐性及び融雪剤（塩化カルシウム）耐性が要求される。 The protective cover of the bearing device that supports the wheels of an automobile is exposed to wind and snow, wind and rain, and under the scorching sun, and is used in an environment where the temperature changes greatly from -40 ° C to 120 ° C, and calcium chloride is the main component. A snow melting agent or the like may adhere to it.
Therefore, the protective cover is required to have thermal shock resistance and snow melting agent (calcium chloride) resistance.

塩化カルシウム耐性試験において、ナイロン６６等のポリアミド樹脂を塩化カルシウム水溶液に浸漬すると、カルシウムイオンがナイロン分子内に浸入して、アミド基間の水素結合部を阻害する。その後、前記試験で乾燥・吸水を繰り返すと、前記ポリアミド樹脂にケミカルクラックが発生することが知られている。 In the calcium chloride resistance test, when a polyamide resin such as nylon 66 is immersed in an aqueous calcium chloride solution, calcium ions infiltrate into the nylon molecules and inhibit hydrogen bonds between amide groups. After that, it is known that chemical cracks occur in the polyamide resin when drying and water absorption are repeated in the test.

そこで、ナイロン６６等に替えてナイロン６１２等の塩化カルシウム耐性が高い材料を用いることが考えられる。しかしながら、ナイロン６１２等の塩化カルシウム耐性が高い材料を用いた場合、熱衝撃耐性が低下するとともに材料コストが大幅に上昇する。
このような現状から、前記保護カバーにおいて、製造コストの上昇を抑えながら、熱衝撃耐性及び塩化カルシウム耐性の要求仕様を満足するのは困難である。 Therefore, it is conceivable to use a material having high calcium chloride resistance such as nylon 612 instead of nylon 66 or the like. However, when a material having high calcium chloride resistance such as nylon 612 is used, the thermal shock resistance is lowered and the material cost is significantly increased.
Under these circumstances, it is difficult for the protective cover to satisfy the required specifications of thermal shock resistance and calcium chloride resistance while suppressing an increase in manufacturing cost.

そこで、本発明は、磁気エンコーダ及び磁気センサ間に仕切壁を設けた、センサホルダ部を有する保護カバーにおいて、製造コストの上昇を抑えながら、熱衝撃耐性及び塩化カルシウム耐性の要求仕様を満足することを目的とする。 Therefore, the present invention satisfies the required specifications of thermal shock resistance and calcium chloride resistance in a protective cover having a sensor holder portion provided with a partition wall between a magnetic encoder and a magnetic sensor, while suppressing an increase in manufacturing cost. With the goal.

本願の発明者は、磁気エンコーダ及び磁気センサ間に仕切壁を設けた合成樹脂製の保護カバーにおいて、仕切壁の厚みは、磁気センサの検出精度及び射出成形時の成形性を考慮して０．３〜１．０ｍｍ程度に設定されること、及びこのような薄肉の仕切壁が塩化カルシウム耐性のウィークポイントであることに着目した。 According to the inventor of the present application, in a protective cover made of synthetic resin in which a partition wall is provided between a magnetic encoder and a magnetic sensor, the thickness of the partition wall is set to 0 in consideration of the detection accuracy of the magnetic sensor and the moldability at the time of injection molding. It was noted that the setting was about 3 to 1.0 mm, and that such a thin partition wall was a weak point of calcium chloride resistance.

そして、本願の発明者は、熱衝撃耐性及び塩化カルシウム耐性の要求仕様を満足するために、高価な材料を用いずに、塩化カルシウム耐性のウィークポイントである薄肉の仕切壁を適切に保護することを想到し、本発明を完成するに至った。 Then, the inventor of the present application appropriately protects the thin partition wall, which is the weak point of calcium chloride resistance, without using expensive materials in order to satisfy the required specifications of heat shock resistance and calcium chloride resistance. We came up with the idea and completed the present invention.

本発明の要旨は以下の通りである。
〔１〕外周面に内輪軌道面が形成された内輪、及び内周面に外輪軌道面が形成された外輪、並びに、前記内輪軌道面及び前記外輪軌道面間を転動する転動体を有する軸受と、
前記軸受の内方側端部に位置して前記内輪に固定された、Ｎ極とＳ極を一定間隔で周方向に交互に並べてなる磁気エンコーダと、
前記磁気エンコーダの磁極に対向して前記磁気エンコーダの回転を検知するための磁気センサと
を含む軸受装置に用いる、
前記軸受の内方側端部を密封するように前記外輪に取り付ける、カップ状の保護カバーであって、
前記保護カバーは、
合成樹脂製の円盤部と、
前記円盤部から内方へ突出する、合成樹脂製のセンサホルダ部と
を含み、
前記円盤部には、前記磁気エンコーダ及び前記磁気センサ間を仕切る仕切壁が形成されており、
前記仕切壁の前記磁気センサに対向する面に保護被膜層を備える、
センサホルダ部を有する保護カバー。 The gist of the present invention is as follows.
[1] A bearing having an inner ring having an inner ring raceway surface formed on an outer peripheral surface, an outer ring having an outer ring raceway surface formed on an inner peripheral surface, and a rolling element that rolls between the inner ring raceway surface and the outer ring raceway surface. When,
A magnetic encoder located at the inner end of the bearing and fixed to the inner ring, in which N poles and S poles are alternately arranged in the circumferential direction at regular intervals.
Used in a bearing device including a magnetic sensor for detecting the rotation of the magnetic encoder facing the magnetic pole of the magnetic encoder.
A cup-shaped protective cover that is attached to the outer ring so as to seal the inner end of the bearing.
The protective cover is
With a synthetic resin disk
Including a sensor holder portion made of synthetic resin that protrudes inward from the disk portion.
A partition wall for partitioning between the magnetic encoder and the magnetic sensor is formed in the disk portion.
A protective coating layer is provided on the surface of the partition wall facing the magnetic sensor.
A protective cover with a sensor holder.

〔２〕前記保護被膜層は、
フッ素樹脂層、シリコーンの硬化被膜層、又は接着剤層である、
前記〔１〕に記載のセンサホルダ部を有する保護カバー。 [2] The protective coating layer is
Fluororesin layer, silicone cured film layer, or adhesive layer,
A protective cover having the sensor holder portion according to the above [1].

〔３〕前記〔１〕又は前記〔２〕に記載のセンサホルダ部を有する保護カバーを備えた軸受装置。 [3] A bearing device provided with a protective cover having the sensor holder portion according to the above [1] or the above [2].

〔４〕外周面に内輪軌道面が形成された内輪、及び内周面に外輪軌道面が形成された外輪、並びに、前記内輪軌道面及び前記外輪軌道面間を転動する転動体を有する軸受と、
前記軸受の内方側端部に位置して前記内輪に固定された、Ｎ極とＳ極を一定間隔で周方向に交互に並べてなる磁気エンコーダと、
前記磁気エンコーダの磁極に対向して前記磁気エンコーダの回転を検知するための磁気センサと
を含む軸受装置に用いる、
前記軸受の内方側端部を密封するように前記外輪に取り付ける、カップ状の保護カバーの製造方法であって、
前記保護カバーは、
合成樹脂製の円盤部と、
前記円盤部から内方へ突出する、合成樹脂製のセンサホルダ部と
を含み、
前記円盤部には、前記磁気エンコーダ及び前記磁気センサ間を仕切る仕切壁が形成されており、
前記仕切壁の前記磁気センサに対向する面に保護被膜層を備え、
前記保護カバーの製造方法は、
前記保護カバーを射出成形金型内で成形する射出成形工程と、
成形された前記保護カバーに対し、前記仕切壁の前記磁気センサに対向する面に保護被膜材料をコーティングして前記保護被膜層を形成する保護被膜形成工程と
を含む、
センサホルダ部を有する保護カバーの製造方法。 [4] An inner ring having an inner ring raceway surface formed on the outer peripheral surface, an outer ring having an outer ring raceway surface formed on the inner peripheral surface, and a bearing having a rolling element that rolls between the inner ring raceway surface and the outer ring raceway surface. When,
A magnetic encoder located at the inner end of the bearing and fixed to the inner ring, in which N poles and S poles are alternately arranged in the circumferential direction at regular intervals.
Used in a bearing device including a magnetic sensor for detecting the rotation of the magnetic encoder facing the magnetic pole of the magnetic encoder.
A method for manufacturing a cup-shaped protective cover, which is attached to the outer ring so as to seal the inner end of the bearing.
The protective cover is
With a synthetic resin disk
Including a sensor holder portion made of synthetic resin that protrudes inward from the disk portion.
A partition wall for partitioning between the magnetic encoder and the magnetic sensor is formed in the disk portion.
A protective coating layer is provided on the surface of the partition wall facing the magnetic sensor.
The method for manufacturing the protective cover is as follows.
An injection molding process in which the protective cover is molded in an injection molding die,
A protective film forming step of coating the surface of the partition wall facing the magnetic sensor with the molded protective cover to form the protective film layer is included.
A method for manufacturing a protective cover having a sensor holder portion.

〔５〕前記保護被膜材料は、
フッ素樹脂、シリコーン、又は接着剤である、
前記〔４〕に記載のセンサホルダ部を有する保護カバーの製造方法。 [5] The protective coating material is
Fluororesin, silicone, or adhesive,
The method for manufacturing a protective cover having the sensor holder portion according to the above [4].

以上のような本発明に係るセンサホルダ部を有する保護カバー、及び前記保護カバーを備えた軸受装置、並びにセンサホルダ部を有する保護カバーの製造方法によれば、主に以下に示す作用効果を奏する。 According to the method for manufacturing the protective cover having the sensor holder portion according to the present invention, the bearing device provided with the protective cover, and the protective cover having the sensor holder portion as described above, the following actions and effects are mainly exhibited. ..

（１）薄肉の仕切壁のセンサ対向面に、保護被膜材料をコーティングしてなる保護被膜層を備えているので、塩化カルシウム耐性のウィークポイントである前記仕切壁を、塩化カルシウム水溶液に対して効果的に保護できる。
（２）それにより、前記仕切壁を設けたセンサホルダ部を有する保護カバーの樹脂材料として、高価な材料を用いることなく、熱衝撃耐性及び塩化カルシウム耐性の要求仕様を満足できるので、製造コストの上昇を抑えることができる。 (1) Since a protective coating layer formed by coating a protective coating material is provided on the sensor facing surface of the thin partition wall, the partition wall, which is a weak point of calcium chloride resistance, is effective against the calcium chloride aqueous solution. Can be protected.
(2) As a result, the required specifications of thermal shock resistance and calcium chloride resistance can be satisfied without using an expensive material as the resin material of the protective cover having the sensor holder portion provided with the partition wall, so that the manufacturing cost can be reduced. The rise can be suppressed.

本発明の実施の形態に係るセンサホルダ部を有する保護カバーを備えた軸受装置の部分縦断面図である。It is a partial vertical sectional view of the bearing apparatus provided with the protective cover which has the sensor holder part which concerns on embodiment of this invention. 本発明の実施の形態に係るセンサホルダ部を有する保護カバーを内方から見た斜視図である。It is a perspective view which looked at the protective cover which has the sensor holder part which concerns on embodiment of this invention from the inside. 本発明の実施の形態に係るセンサホルダ部を有する保護カバーを外方から見た斜視図である。It is a perspective view which looked at the protection cover which has the sensor holder part which concerns on embodiment of this invention from the outside. 本発明の実施の形態に係るセンサホルダ部を有する保護カバーの要部拡大縦断面図であり、仕切壁のセンサ対向面に保護被膜層を形成した例を示している。FIG. 5 is an enlarged vertical cross-sectional view of a main part of a protective cover having a sensor holder portion according to an embodiment of the present invention, showing an example in which a protective coating layer is formed on a sensor facing surface of a partition wall. 本発明の実施の形態に係るセンサホルダ部を有する保護カバーの要部拡大縦断面図であり、仕切壁のセンサ対向面とともに、センサ取付穴の内周面にも保護被膜層を形成した例を示している。FIG. 5 is an enlarged vertical cross-sectional view of a main part of a protective cover having a sensor holder portion according to an embodiment of the present invention, and is an example in which a protective coating layer is formed on the inner peripheral surface of the sensor mounting hole as well as the sensor facing surface of the partition wall. Shown. 保護被膜形成工程の例を示す要部拡大部分縦断面概略図である。It is schematic cross-sectional view of the main part enlarged part which shows the example of the protective film forming process.

次に、添付図面に示した実施形態に基づき、本発明を更に詳細に説明する。
なお、本明細書において、軸受装置Ａの回転軸の方向を「軸方向」、軸方向に直交する方向を「径方向」という。
また、軸受１１及び保護カバー１について、保護カバー１を軸受１１に装着した状態で、自動車の車体から車輪側に向かう軸方向に平行な方向（アウトボード）を「外方」（図１の矢印ＯＢ参照）、自動車の車輪から車体側に向かう軸方向に平行な方向（インボード）を「内方」（図１の矢印ＩＢ参照）という。 Next, the present invention will be described in more detail based on the embodiments shown in the accompanying drawings.
In the present specification, the direction of the rotation axis of the bearing device A is referred to as "axial direction", and the direction orthogonal to the axial direction is referred to as "diametrical direction".
Further, with respect to the bearing 11 and the protective cover 1, with the protective cover 1 mounted on the bearing 11, the direction (outboard) parallel to the axial direction from the vehicle body to the wheel side is "outward" (arrow in FIG. 1). (Refer to OB), the direction (inboard) parallel to the axial direction from the wheel of the automobile toward the vehicle body side is referred to as "inward" (see the arrow IB in FIG. 1).

＜軸受装置＞
図１の部分縦断面図に示すように、本発明の実施の形態に係る軸受装置Ａは、外輪１３に対して内輪１２が回転する軸受１１の他に、磁気エンコーダ８、保護カバー１、及び磁気センサ６、並びに軸受１１の外方（矢印ＯＢ参照）側端部に配置したシール部材１５等を備える。 <Bearing device>
As shown in the partial longitudinal sectional view of FIG. 1, the bearing device A according to the embodiment of the present invention includes a magnetic encoder 8, a protective cover 1, and a bearing 11 in which the inner ring 12 rotates with respect to the outer ring 13. It includes a magnetic sensor 6, a seal member 15 and the like arranged at the outer (see arrow OB) side end of the bearing 11.

軸受１１は、外周面に内輪軌道面１２Ａが形成された内輪１２、及び内周面に外輪軌道面１３Ａが形成された外輪１３、並びに、内輪軌道面１２Ａ及び外輪軌道面１３Ａ間を転動する転動体１４，１４，…等を有する。 The bearing 11 rolls between the inner ring 12 having the inner ring raceway surface 12A formed on the outer peripheral surface, the outer ring 13 having the outer ring raceway surface 13A formed on the inner peripheral surface, and the inner ring raceway surface 12A and the outer ring raceway surface 13A. It has rolling elements 14, 14, ..., Etc.

磁気エンコーダ８は、Ｎ極とＳ極を一定間隔で周方向に交互に並べたものであり、軸受１１の内方（矢印ＩＢ参照）側端部に位置する支持部材９により内輪１２に固定される。 The magnetic encoder 8 has N poles and S poles arranged alternately in the circumferential direction at regular intervals, and is fixed to the inner ring 12 by a support member 9 located at the inner (see arrow IB) side end of the bearing 11. Ru.

保護カバー１は、カップ状であり、軸受１１の内方側端部を密封するように外輪１３に取り付けられ、磁気センサ６を保持するセンサホルダ部４を有する。
保護カバー１のセンサホルダ部４に装着された磁気センサ６は、例えば厚みが０．３〜１．０ｍｍ程度である仕切壁５を隔てて磁気エンコーダ８に対向し、磁気エンコーダ８の回転を検知する。 The protective cover 1 has a cup shape, is attached to the outer ring 13 so as to seal the inner end portion of the bearing 11, and has a sensor holder portion 4 for holding the magnetic sensor 6.
The magnetic sensor 6 mounted on the sensor holder portion 4 of the protective cover 1 faces the magnetic encoder 8 with a partition wall 5 having a thickness of about 0.3 to 1.0 mm, for example, and detects the rotation of the magnetic encoder 8. To do.

保護カバー１には仕切壁５があり、厚み方向に貫通する貫通穴がないので、Ｏリング等のシール部材を組み込む必要がない。
また、保護カバー１により軸受１１の内方側端部が密封されるので、磁気エンコーダ８に小石や泥水等が当たらないことから磁気エンコーダ８の破損を防止できる。 Since the protective cover 1 has a partition wall 5 and does not have a through hole penetrating in the thickness direction, it is not necessary to incorporate a sealing member such as an O-ring.
Further, since the inner end portion of the bearing 11 is sealed by the protective cover 1, damage to the magnetic encoder 8 can be prevented because pebbles, muddy water, or the like do not hit the magnetic encoder 8.

さらに、保護カバー１により軸受１１の内方側端部が密封されるので、磁気エンコーダ８の内方側のシール部材が不要になるため、摺動抵抗の低減により軸受１１の回転トルクを低減できる。
さらにまた、保護カバー１がセンサホルダ部４を備えているので、磁気エンコーダ８と磁気センサ６とのエアギャップ調整作業の煩雑さを解消できる。 Further, since the inner end of the bearing 11 is sealed by the protective cover 1, the inner sealing member of the magnetic encoder 8 is not required, so that the rotational torque of the bearing 11 can be reduced by reducing the sliding resistance. ..
Furthermore, since the protective cover 1 includes the sensor holder portion 4, it is possible to eliminate the complexity of the air gap adjusting work between the magnetic encoder 8 and the magnetic sensor 6.

＜保護カバー＞
図１の部分縦断面図、並びに図２Ａ及び図２Ｂの斜視図に示す本発明の実施の形態に係る保護カバー１は、繊維強化合成樹脂製本体１Ａ及び金属製環体１Ｂからなる。 <Protective cover>
The protective cover 1 according to the embodiment of the present invention shown in the partial vertical sectional view of FIG. 1 and the perspective views of FIGS. 2A and 2B comprises a fiber-reinforced synthetic resin main body 1A and a metal ring body 1B.

ここで、本体１Ａを成形する繊維強化合成樹脂としては、例えば、ポリアミド（ナイロン６、ナイロン６６等）、ポリフェニレンサルファイド（ＰＰＳ）、又はポリブチレンテレフタレート（ＰＢＴ）等の合成樹脂に、ガラス繊維を２０〜７０重量％含有したものを用いる。
また、金属製環体１Ｂは、低炭素鋼であるＳＰＣＣ等の冷間圧延鋼板を使用するのが望ましい。 Here, as the fiber-reinforced synthetic resin for molding the main body 1A, for example, 20 glass fibers are added to a synthetic resin such as polyamide (nylon 6, nylon 66, etc.), polyphenylene sulfide (PPS), or polybutylene terephthalate (PBT). Use one containing ~ 70% by weight.
Further, it is desirable to use a cold-rolled steel plate such as SPCC, which is a low carbon steel, for the metal ring 1B.

本体１Ａは、カップ状を成す円盤部２及び円筒部３、並びに円盤部２から内方へ突出するセンサホルダ部４からなる。 The main body 1A includes a cup-shaped disk portion 2 and a cylindrical portion 3, and a sensor holder portion 4 protruding inward from the disk portion 2.

センサホルダ部４は、磁気センサ６を取り付けるための取付ボルトＢが螺合する、例えば真鍮であるナット７を保持するとともに、磁気センサ６を挿入するセンサ取付穴４Ａを有する。 The sensor holder portion 4 holds a nut 7 to which a mounting bolt B for mounting the magnetic sensor 6 is screwed, for example, brass, and has a sensor mounting hole 4A into which the magnetic sensor 6 is inserted.

円盤部２には、磁気エンコーダ８及び磁気センサ６間を仕切る、他の部分よりも薄肉の仕切壁５が形成されており、図３Ａ及び図３Ｂの要部拡大縦断面図に示すように、仕切壁５の磁気センサ６（図１）に対向するセンサ対向面５Ａに、保護被膜層１０を備える。
保護被膜層１０は、例えば、フッ素樹脂層、シリコーン（シリコーン樹脂も含む）の硬化被膜層、又は接着剤層である。
例えば、フッ素樹脂層の厚みは０．１μｍ〜５μｍ程度であり、接着剤層の厚みは５μｍ〜５０μｍ程度である。
保護被膜層１０の厚みは、磁気センサ６の検出精度が低下しないように、１００μｍ以下にする。 The disk portion 2 is formed with a partition wall 5 that is thinner than the other portions that partitions the magnetic encoder 8 and the magnetic sensor 6. As shown in the enlarged vertical sectional views of the main parts of FIGS. 3A and 3B. The protective coating layer 10 is provided on the sensor facing surface 5A facing the magnetic sensor 6 (FIG. 1) of the partition wall 5.
The protective coating layer 10 is, for example, a fluororesin layer, a cured coating layer of silicone (including silicone resin), or an adhesive layer.
For example, the thickness of the fluororesin layer is about 0.1 μm to 5 μm, and the thickness of the adhesive layer is about 5 μm to 50 μm.
The thickness of the protective coating layer 10 is set to 100 μm or less so that the detection accuracy of the magnetic sensor 6 does not deteriorate.

＜保護カバーの製造方法＞
次に、図２Ａ及び図２Ｂに示すセンサホルダ部４を有する保護カバー１の製造方法について説明する。 <Manufacturing method of protective cover>
Next, a method of manufacturing the protective cover 1 having the sensor holder portion 4 shown in FIGS. 2A and 2B will be described.

（射出成形工程）
図示しない射出成形金型を開いて、インサート品であるナット７及びインサート品である金属製環体１Ｂをセットし、射出成形機に取り付けられた前記射出成形金型を型締めする。
次に、前記射出成形金型のゲートから溶融樹脂材料を前記射出成形金型のキャビティ内に充填する。
それにより、前記射出成形金型内で、金属（ナット７、金属製環体１Ｂ）と樹脂とを一体化したインサート成形品である保護カバー１を成形する。 (Injection molding process)
An injection molding die (not shown) is opened, a nut 7 as an insert product and a metal ring 1B as an insert product are set, and the injection molding die attached to the injection molding machine is molded.
Next, the molten resin material is filled into the cavity of the injection molding die from the gate of the injection molding die.
As a result, the protective cover 1 which is an insert molded product in which the metal (nut 7, metal ring 1B) and the resin are integrated is molded in the injection molding die.

（成形品取出し工程）
次に、前記射出成形金型のキャビティ内の溶融樹脂材料を冷却・固化させた後、前記射出成形金型を開き、エジェクタピンにより突き出すことにより、インサート成形品である保護カバー１を取り出す。 (Molded product removal process)
Next, after cooling and solidifying the molten resin material in the cavity of the injection molding die, the injection molding die is opened and projected by an ejector pin to take out the protective cover 1 which is an insert molded product.

以上のような射出成形工程及び成形品取出し工程を経て製造されたセンサホルダ部４を有する保護カバー１において、ナット７の周溝７Ａに合成樹脂が入り込んでいるので、ナット７の抜け止めがされる。
また、金属製環体１Ｂの外方（図１の矢印ＯＢ参照）側端部に円筒部３が回り込んでいるので（図３Ａ及び図３Ｂも参照）、金属製環体１Ｂと繊維強化合成樹脂製本体１Ａは機械的に結合する。 In the protective cover 1 having the sensor holder portion 4 manufactured through the injection molding step and the molded product taking-out step as described above, since the synthetic resin has entered the peripheral groove 7A of the nut 7, the nut 7 is prevented from coming off. To.
Further, since the cylindrical portion 3 wraps around the outer side end of the metal ring 1B (see the arrow OB in FIG. 1) (see also FIGS. 3A and 3B), the metal ring 1B and the fiber reinforced plastic are synthesized. The resin main body 1A is mechanically bonded.

（保護被膜形成工程）
前記射出成形金型から取り出した保護カバー１に対して、図４の要部拡大部分縦断面概略図に示すように、センサ取付穴４Ａから、仕切壁５のセンサ対向面５Ａに向かって、例えばスプレー装置Ｄにより保護被膜材料Ｃを噴霧する。 (Protective film forming process)
With respect to the protective cover 1 taken out from the injection molding die, for example, from the sensor mounting hole 4A toward the sensor facing surface 5A of the partition wall 5, as shown in the schematic vertical cross-sectional view of the enlarged portion of the main part of FIG. The protective coating material C is sprayed by the spray device D.

保護被膜材料Ｃは、耐薬品性（塩化カルシウム耐性）、撥水性が高い、フッ素樹脂、シリコーン（シリコーン樹脂も含む）、接着剤等を使用する。すなわち、保護被膜材料Ｃは、例えば、フッ素樹脂、シリコーン（シリコーン樹脂も含む）、又は接着剤であり、液状のものである。
接着剤としては、例えば、フェノール樹脂系接着剤又はエポキシ樹脂系接着剤等の熱硬化性樹脂接着剤を用いる。 As the protective coating material C, a fluororesin, silicone (including silicone resin), an adhesive or the like having high chemical resistance (calcium chloride resistance) and high water repellency is used. That is, the protective coating material C is, for example, a fluororesin, a silicone (including a silicone resin), or an adhesive, and is a liquid material.
As the adhesive, for example, a thermosetting resin adhesive such as a phenol resin adhesive or an epoxy resin adhesive is used.

スプレー装置Ｄ等により、仕切壁５のセンサ対向面５Ａには保護被膜材料Ｃをコーティングし、それにより図３Ａ又は図３Ｂの要部拡大縦断面図のように、センサ対向面５Ａに保護被膜層１０を設ける。なお、図３Ａ及び図３Ｂにおいて、保護被膜層１０の厚みは、実際の厚みよりも厚く、拡大して示している。 The sensor facing surface 5A of the partition wall 5 is coated with the protective coating material C by a spray device D or the like, whereby the protective coating layer is coated on the sensor facing surface 5A as shown in the enlarged vertical cross-sectional view of the main part in FIG. 3A or FIG. 3B. 10 is provided. In addition, in FIG. 3A and FIG. 3B, the thickness of the protective coating layer 10 is thicker than the actual thickness and is shown enlarged.

スプレー装置Ｄにより保護被膜材料Ｃとしてフッ素樹脂を噴霧することにより、センサ対向面５Ａに、保護被膜層１０としてフッ素樹脂層を形成できる。
スプレー装置Ｄにより保護被膜材料Ｃとしてシリコーン（シリコーン樹脂も含む）を噴霧することにより、センサ対向面５Ａに、保護被膜層１０としてシリコーン（シリコーン樹脂も含む）の硬化被膜層を形成できる。
スプレー装置Ｄではなく、ディスペンサ等により保護被膜材料Ｃとして接着剤を塗布することにより、センサ対向面５Ａに、保護被膜層１０として接着剤層を形成できる。 By spraying the fluororesin as the protective coating material C with the spray device D, the fluororesin layer can be formed as the protective coating layer 10 on the sensor facing surface 5A.
By spraying silicone (including silicone resin) as the protective coating material C by the spray device D, a cured coating layer of silicone (including silicone resin) can be formed as the protective coating layer 10 on the sensor facing surface 5A.
By applying the adhesive as the protective coating material C with a dispenser or the like instead of the spray device D, the adhesive layer can be formed as the protective coating layer 10 on the sensor facing surface 5A.

なお、センサ対向面５Ａに保護被膜材料Ｃをコーティングした後、所要の乾燥処理又は熱硬化処理を行うことにより、保護被膜層１０とする。
保護被膜層１０がフッ素樹脂層である場合、例えば、自然乾燥又は強制乾燥させる。
保護被膜層１０がシリコーン（シリコーン樹脂も含む）の硬化被膜層である場合、例えば、自然乾燥若しくは強制乾燥、又は熱硬化処理を行う。
保護被膜層１０が熱硬化性樹脂接着剤である場合、架橋反応開始温度以上の温度で所定時間以上加熱する熱硬化処理を行って、例えば完全硬化させる。 After coating the sensor facing surface 5A with the protective coating material C, the protective coating layer 10 is formed by performing a necessary drying treatment or thermosetting treatment.
When the protective coating layer 10 is a fluororesin layer, for example, it is naturally dried or forcibly dried.
When the protective coating layer 10 is a cured coating layer of silicone (including a silicone resin), for example, natural drying, forced drying, or thermosetting treatment is performed.
When the protective coating layer 10 is a thermosetting resin adhesive, it is subjected to a thermosetting treatment of heating at a temperature equal to or higher than the cross-linking reaction start temperature for a predetermined time or longer to, for example, completely cure.

インサート成形品である保護カバー１に対して、本体１Ａの残留応力を取り除くアニール処理を行う場合は、アニール処理を行う前にセンサ対向面５Ａに保護被膜材料Ｃをコーティングしておき、アニール処理により保護被膜層１０の熱硬化処理を行うようにしてもよい。 When the protective cover 1 which is an insert molded product is subjected to an annealing treatment for removing the residual stress of the main body 1A, the sensor facing surface 5A is coated with the protective coating material C before the annealing treatment, and the protective coating material C is coated by the annealing treatment. The protective coating layer 10 may be heat-cured.

保護被膜層１０は、図３Ａのように少なくともセンサ対向面５Ａの全面に形成すればよい。保護被膜層１０を、図３Ｂのように、センサ対向面５Ａとともに、センサ取付穴４Ａの内周面に形成してもよい。 The protective coating layer 10 may be formed on at least the entire surface of the sensor facing surface 5A as shown in FIG. 3A. As shown in FIG. 3B, the protective coating layer 10 may be formed on the inner peripheral surface of the sensor mounting hole 4A together with the sensor facing surface 5A.

センサ対向面５Ａに保護被膜層１０を設けるために、センサ対向面５Ａに保護被膜材料Ｃを付着させる方法は、スプレー装置Ｄに限定されるものではなく、ディスペンサ、又は所要形状の刷毛若しくはローラー等を用いてもよい。 The method of adhering the protective coating material C to the sensor facing surface 5A in order to provide the protective coating layer 10 on the sensor facing surface 5A is not limited to the spray device D, and is not limited to the spray device D, such as a dispenser, a brush or a roller having a required shape, or the like. May be used.

＜塩化カルシウム耐性試験＞
保護カバー１の本体１Ａを成形する合成樹脂をナイロン６６とし、本体１Ａの仕切壁５のセンサ対向面５Ａに形成した保護被膜層１０の有無及び種類による塩化カルシウム耐性を比較する実験を行った。
保護カバー１の仕切壁５のセンサ対向面５Ａに、保護被膜材料Ｃを噴霧又は塗布し、センサ対向面５Ａの全面に保護被膜層１０を形成した。すなわち、保護被膜材料Ｃが、フッ素樹脂、シリコーンゴム、又は自動車の下廻り防錆剤である場合は、スプレー装置Ｄにより噴霧し、保護被膜材料Ｃが接着剤である場合は塗布した。 <Calcium chloride resistance test>
Nylon 66 was used as the synthetic resin for molding the main body 1A of the protective cover 1, and an experiment was conducted to compare the calcium chloride resistance depending on the presence and type of the protective coating layer 10 formed on the sensor facing surface 5A of the partition wall 5 of the main body 1A.
The protective coating material C was sprayed or applied to the sensor facing surface 5A of the partition wall 5 of the protective cover 1, and the protective coating layer 10 was formed on the entire surface of the sensor facing surface 5A. That is, when the protective coating material C was a fluororesin, silicone rubber, or an undercarriage rust preventive for automobiles, it was sprayed by the spray device D, and when the protective coating material C was an adhesive, it was applied.

（実施例及び比較例）
保護被膜材料Ｃを、フッ素樹脂、シリコーンゴム、接着剤、自動車の下廻り防錆剤の４種類とし、Ｎ＝２とした。フッ素樹脂、シリコーンゴム、接着剤を実施例、自動車の下廻り防錆剤を比較例とした。
実施例のシリコーンゴムは、空気中の湿気（水分）と反応し、ゴム状弾性体に硬化する１成分形ＲＴＶシリコーンゴムとした。 (Examples and comparative examples)
The protective coating material C was set to 4 types of fluororesin, silicone rubber, adhesive, and undercarriage rust preventive for automobiles, and N = 2. Fluororesin, silicone rubber, and adhesive were used as examples, and an automobile undercarriage rust preventive was used as a comparative example.
The silicone rubber of the example was a one-component RTV silicone rubber that reacts with moisture (moisture) in the air and cures into a rubber-like elastic body.

フッ素樹脂、及びシリコーンゴムは、センサ対向面５Ａにコーティングした後に自然乾燥させた。
接着剤は、フェノール樹脂系接着剤とし、センサ対向面５Ａにコーティングした後に１５０℃で３時間の熱硬化処理を行い完全硬化させた。
自動車の下廻り防錆剤は、塩化カルシウムと化学反応して防錆被膜を作る反応型防錆剤であり、センサ対向面５Ａにコーティングした後に自然乾燥させた。 The fluororesin and the silicone rubber were coated on the sensor facing surface 5A and then naturally dried.
The adhesive was a phenolic resin adhesive, and after coating the sensor facing surface 5A, it was heat-cured at 150 ° C. for 3 hours to completely cure it.
The undercarriage rust preventive for automobiles is a reactive rust preventive that chemically reacts with calcium chloride to form a rust preventive film, and is naturally dried after being coated on the sensor facing surface 5A.

実施例１ないし６、及び比較例１ないし４の保護カバーは、センサ対向面５Ａにコーティングする保護被膜材料Ｃの有無、及び種類を以下のとおりとした。
（１）実施例１、２：保護被膜材料Ｃがフッ素樹脂
（２）実施例３、４：保護被膜材料Ｃがシリコーンゴム
（３）実施例５、６：保護被膜材料Ｃが接着剤（フェノール樹脂系接着剤）
（４）比較例１、２：保護被膜材料Ｃ無し（保護被膜層１０無し）
（５）比較例３、４：保護被膜材料Ｃが自動車の下廻り防錆剤 For the protective covers of Examples 1 to 6 and Comparative Examples 1 to 4, the presence / absence and type of the protective coating material C to be coated on the sensor facing surface 5A are as follows.
(1) Examples 1 and 2: Protective coating material C is fluororesin (2) Examples 3 and 4: Protective coating material C is silicone rubber (3) Examples 5 and 6: Protective coating material C is adhesive (phenol) Resin-based adhesive)
(4) Comparative Examples 1 and 2: Without protective coating material C (without protective coating layer 10)
(5) Comparative Examples 3 and 4: Protective coating material C is below the automobile and is a rust preventive.

（試験方法）
図１の部分縦断面図の軸受１１の外輪１３を模した模擬外輪に、実施例１ないし６、及び比較例１ないし４の保護カバ−１を圧入したものを試験対象とした。
それらの試験対象を、（１）９０℃、９５％ＲＨの雰囲気に１時間放置、（２）飽和塩化カルシウム水溶液に浸漬、（３）１００℃で１時間乾燥、（４）１時間室温で冷却、の（１）ないし（４）の工程を１サイクルとし、４サイクル終了後、８サイクル終了後、１２サイクル終了後、及び１４サイクル終了後に、エアー漏れの有無を確認する試験を行った。塩化カルシウムにより仕切壁５にケミカルクラックが発生すると、エアー漏れが生じる。 (Test method)
A simulated outer ring imitating the outer ring 13 of the bearing 11 in the partial vertical cross-sectional view of FIG. 1 was press-fitted with the protective covers-1 of Examples 1 to 6 and Comparative Examples 1 to 4 as test targets.
The test objects were (1) left in an atmosphere of 90 ° C. and 95% RH for 1 hour, (2) immersed in a saturated aqueous calcium chloride solution, (3) dried at 100 ° C. for 1 hour, and (4) cooled at room temperature for 1 hour. The steps (1) to (4) of the above were set as one cycle, and a test was conducted to confirm the presence or absence of air leakage after the end of 4 cycles, the end of 8 cycles, the end of 12 cycles, and the end of 14 cycles. When chemical cracks occur in the partition wall 5 due to calcium chloride, air leakage occurs.

（試験結果）
表１のとおり、比較例１（保護被膜層１０無し）は、８サイクル終了後又は１２サイクル終了後にエアー漏れが有った。
また、比較例２（保護被膜材料Ｃが自動車の下廻り防錆剤）は、１２サイクル終了後にエアー漏れが有った。 (Test results)
As shown in Table 1, Comparative Example 1 (without the protective coating layer 10) had an air leak after the end of 8 cycles or the end of 12 cycles.
Further, in Comparative Example 2 (the protective coating material C is a rust preventive agent under the automobile), there was an air leak after the end of 12 cycles.

Figure 2021008941
Figure 2021008941

それに対して、実施例１ないし６（保護被膜材料Ｃが、フッ素樹脂、シリコーンゴム、接着剤）は、何れも、前記（１）ないし（４）の工程を１４サイクル終了した後であっても、エアー漏れは無かった。
よって、仕切壁５のセンサ対向面５Ａに、保護被膜材料Ｃにより保護被膜層１０（フッ素樹脂層、シリコーンゴムの硬化被膜層、又は接着剤層）を設けることにより、塩化カルシウム水溶液に対して仕切壁５を効果的に保護できることが分かる。 On the other hand, in Examples 1 to 6 (the protective coating material C is a fluororesin, a silicone rubber, and an adhesive), even after 14 cycles of the steps (1) to (4) have been completed. , There was no air leak.
Therefore, by providing the protective coating layer 10 (fluororesin layer, silicone rubber cured coating layer, or adhesive layer) with the protective coating material C on the sensor facing surface 5A of the partition wall 5, the partition wall 5 is partitioned from the calcium chloride aqueous solution. It can be seen that the wall 5 can be effectively protected.

なお、比較例２の保護被膜材料Ｃが自動車の下廻り防錆剤である場合に、保護被膜層１０による塩化カルシウム耐性の向上が小さいのは、自動車の下廻り防錆剤が自動車の下廻り等の金属へのコーティングを目的として開発されたものであることから、樹脂である仕切壁５のセンサ対向面５Ａへの凝着力が低いためであると考えられる。 When the protective coating material C of Comparative Example 2 is a rust preventive under the automobile, the improvement in calcium chloride resistance by the protective coating layer 10 is small because the rust preventive under the automobile is a metal such as under the automobile. It is considered that this is because the partition wall 5 which is a resin has a low adhesive force to the sensor facing surface 5A because it was developed for the purpose of coating the rust.

以上のような保護カバー１によれば、薄肉の仕切壁５のセンサ対向面５Ａに、保護被膜材料Ｃ（フッ素樹脂、シリコーン（シリコーン樹脂も含む）、接着剤）をコーティングしてなる保護被膜層１０を備えているので、塩化カルシウム耐性のウィークポイントである仕切壁５を、塩化カルシウム水溶液に対して効果的に保護できる。
それにより、仕切壁５を設けたセンサホルダ部４を有する保護カバー１の樹脂材料として、高価な材料を用いることなく、熱衝撃耐性及び塩化カルシウム耐性の要求仕様を満足できるので、製造コストの上昇を抑えることができる。 According to the protective cover 1 as described above, the protective coating layer formed by coating the sensor facing surface 5A of the thin partition wall 5 with the protective coating material C (fluororesin, silicone (including silicone resin), adhesive). Since the 10 is provided, the partition wall 5, which is a weak point of calcium chloride resistance, can be effectively protected against the calcium chloride aqueous solution.
As a result, the required specifications of thermal shock resistance and calcium chloride resistance can be satisfied without using an expensive material as the resin material of the protective cover 1 having the sensor holder portion 4 provided with the partition wall 5, so that the manufacturing cost increases. Can be suppressed.

特に、保護被膜材料Ｃをフッ素樹脂にすることにより、速乾性があるので量産性に優れ、高温特性にも優れる。また、保護被膜材料Ｃをシリコーンゴムにすることにより、ゴム弾性があるので低温特性に優れ、高温特性も保護カバーの要求仕様を十分に満足する。 In particular, by using a fluororesin as the protective coating material C, it dries quickly, so that it is excellent in mass productivity and excellent in high temperature characteristics. Further, by using silicone rubber as the protective coating material C, since it has rubber elasticity, it is excellent in low temperature characteristics, and the high temperature characteristics also fully satisfy the required specifications of the protective cover.

以上の実施の形態の記載はすべて例示であり、これに制限されるものではない。本発明の範囲から逸脱することなく種々の改良及び変更を施すことができる。 All the descriptions of the above embodiments are examples, and the present invention is not limited thereto. Various improvements and modifications can be made without departing from the scope of the present invention.

１ 保護カバー １Ａ 繊維強化合成樹脂製本体
１Ｂ 金属製環体 ２ 円盤部
３ 円筒部 ４ センサホルダ部
４Ａ センサ取付穴 ５ 仕切壁
５Ａ センサ対向面 ６ 磁気センサ
７ ナット ７Ａ 周溝
８ 磁気エンコーダ ９ 支持部材
１０ 保護被膜層 １１ 軸受
１２ 内輪 １２Ａ 内輪軌道面
１３ 外輪 １３Ａ 外輪駆動面
１４ 転動体 １５ シール部材
Ａ 軸受装置 Ｂ 取付ボルト
Ｃ 保護被膜材料 Ｄ スプレー装置
ＩＢ 内方 ＯＢ 外方 1 Protective cover 1A Fiber reinforced synthetic resin body 1B Metal ring 2 Disc 3 Cylindrical 4 Sensor holder 4A Sensor mounting hole 5 Partition wall 5A Sensor facing surface 6 Magnetic sensor 7 Nut 7A Circumferential groove 8 Magnetic encoder 9 Support member 10 Protective coating layer 11 Bearing 12 Inner ring 12A Inner ring raceway surface 13 Outer ring 13A Outer ring drive surface 14 Rolling element 15 Sealing member A Bearing device B Mounting bolt C Protective coating material D Spray device IB Inner OB Outer

Claims (5)

外周面に内輪軌道面が形成された内輪、及び内周面に外輪軌道面が形成された外輪、並びに、前記内輪軌道面及び前記外輪軌道面間を転動する転動体を有する軸受と、
前記軸受の内方側端部に位置して前記内輪に固定された、Ｎ極とＳ極を一定間隔で周方向に交互に並べてなる磁気エンコーダと、
前記磁気エンコーダの磁極に対向して前記磁気エンコーダの回転を検知するための磁気センサと
を含む軸受装置に用いる、
前記軸受の内方側端部を密封するように前記外輪に取り付ける、カップ状の保護カバーであって、
前記保護カバーは、
合成樹脂製の円盤部と、
前記円盤部から内方へ突出する、合成樹脂製のセンサホルダ部と
を含み、
前記円盤部には、前記磁気エンコーダ及び前記磁気センサ間を仕切る仕切壁が形成されており、
前記仕切壁の前記磁気センサに対向する面に保護被膜層を備える、
センサホルダ部を有する保護カバー。 An inner ring having an inner ring raceway surface formed on the outer peripheral surface, an outer ring having an outer ring raceway surface formed on the inner peripheral surface, and a bearing having a rolling element that rolls between the inner ring raceway surface and the outer ring raceway surface.
A magnetic encoder located at the inner end of the bearing and fixed to the inner ring, in which N poles and S poles are alternately arranged in the circumferential direction at regular intervals.
Used in a bearing device including a magnetic sensor for detecting the rotation of the magnetic encoder facing the magnetic pole of the magnetic encoder.
A cup-shaped protective cover that is attached to the outer ring so as to seal the inner end of the bearing.
The protective cover is
With a synthetic resin disk
Including a sensor holder portion made of synthetic resin that protrudes inward from the disk portion.
A partition wall for partitioning between the magnetic encoder and the magnetic sensor is formed in the disk portion.
A protective coating layer is provided on the surface of the partition wall facing the magnetic sensor.
A protective cover with a sensor holder. 前記保護被膜層は、
フッ素樹脂層、シリコーンの硬化被膜層、又は接着剤層である、
請求項１に記載のセンサホルダ部を有する保護カバー。 The protective coating layer is
Fluororesin layer, silicone cured film layer, or adhesive layer,
A protective cover having the sensor holder portion according to claim 1. 請求項１又は２に記載のセンサホルダ部を有する保護カバーを備えた軸受装置。 A bearing device provided with a protective cover having the sensor holder portion according to claim 1 or 2. 外周面に内輪軌道面が形成された内輪、及び内周面に外輪軌道面が形成された外輪、並びに、前記内輪軌道面及び前記外輪軌道面間を転動する転動体を有する軸受と、
前記軸受の内方側端部に位置して前記内輪に固定された、Ｎ極とＳ極を一定間隔で周方向に交互に並べてなる磁気エンコーダと、
前記磁気エンコーダの磁極に対向して前記磁気エンコーダの回転を検知するための磁気センサと
を含む軸受装置に用いる、
前記軸受の内方側端部を密封するように前記外輪に取り付ける、カップ状の保護カバーの製造方法であって、
前記保護カバーは、
合成樹脂製の円盤部と、
前記円盤部から内方へ突出する、合成樹脂製のセンサホルダ部と
を含み、
前記円盤部には、前記磁気エンコーダ及び前記磁気センサ間を仕切る仕切壁が形成されており、
前記仕切壁の前記磁気センサに対向する面に保護被膜層を備え、
前記保護カバーの製造方法は、
前記保護カバーを射出成形金型内で成形する射出成形工程と、
成形された前記保護カバーに対し、前記仕切壁の前記磁気センサに対向する面に保護被膜材料をコーティングして前記保護被膜層を形成する保護被膜形成工程と
を含む、
センサホルダ部を有する保護カバーの製造方法。 An inner ring having an inner ring raceway surface formed on the outer peripheral surface, an outer ring having an outer ring raceway surface formed on the inner peripheral surface, and a bearing having a rolling element that rolls between the inner ring raceway surface and the outer ring raceway surface.
A magnetic encoder located at the inner end of the bearing and fixed to the inner ring, in which N poles and S poles are alternately arranged in the circumferential direction at regular intervals.
Used in a bearing device including a magnetic sensor for detecting the rotation of the magnetic encoder facing the magnetic pole of the magnetic encoder.
A method for manufacturing a cup-shaped protective cover, which is attached to the outer ring so as to seal the inner end of the bearing.
The protective cover is
With a synthetic resin disk
Including a sensor holder portion made of synthetic resin that protrudes inward from the disk portion.
A partition wall for partitioning between the magnetic encoder and the magnetic sensor is formed in the disk portion.
A protective coating layer is provided on the surface of the partition wall facing the magnetic sensor.
The method for manufacturing the protective cover is as follows.
An injection molding process in which the protective cover is molded in an injection molding die,
A protective film forming step of coating the surface of the partition wall facing the magnetic sensor with the molded protective cover to form the protective film layer is included.
A method for manufacturing a protective cover having a sensor holder portion. 前記保護被膜材料は、
フッ素樹脂、シリコーン、又は接着剤である、
請求項４に記載のセンサホルダ部を有する保護カバーの製造方法。 The protective coating material is
Fluororesin, silicone, or adhesive,
The method for manufacturing a protective cover having the sensor holder portion according to claim 4.
JP2019123937A 2019-07-02 2019-07-02 Protective cover having sensor holder part, bearing device having the protective cover, manufacturing method of protective cover having sensor holder part Pending JP2021008941A (en)

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007177827A (en) * 2005-12-27 2007-07-12 Tokai Rubber Ind Ltd Vibration isolation device
JP2007225206A (en) * 2006-02-24 2007-09-06 Mitsubishi Motors Corp Radiator
JP2015094436A (en) * 2013-11-13 2015-05-18 日本精工株式会社 Bearing device
JP2016170001A (en) * 2015-03-12 2016-09-23 Ntn株式会社 Bearing apparatus for wheel with rotation speed detection device

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007177827A (en) * 2005-12-27 2007-07-12 Tokai Rubber Ind Ltd Vibration isolation device
JP2007225206A (en) * 2006-02-24 2007-09-06 Mitsubishi Motors Corp Radiator
JP2015094436A (en) * 2013-11-13 2015-05-18 日本精工株式会社 Bearing device
JP2016170001A (en) * 2015-03-12 2016-09-23 Ntn株式会社 Bearing apparatus for wheel with rotation speed detection device

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