JP2009197969A - Sealing device for rolling bearing - Google Patents

Sealing device for rolling bearing Download PDF

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JP2009197969A
JP2009197969A JP2008042815A JP2008042815A JP2009197969A JP 2009197969 A JP2009197969 A JP 2009197969A JP 2008042815 A JP2008042815 A JP 2008042815A JP 2008042815 A JP2008042815 A JP 2008042815A JP 2009197969 A JP2009197969 A JP 2009197969A
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Prior art keywords
seal
slinger
rolling bearing
bearing
flat surface
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Japanese (ja)
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Tetsuro Inoue
哲朗 井上
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JTEKT Corp
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JTEKT Corp
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
    • F16C33/72—Sealings
    • F16C33/76—Sealings of ball or roller bearings
    • F16C33/78—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members
    • F16C33/784—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members mounted to a groove in the inner surface of the outer race and extending toward the inner race
    • F16C33/7859—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members mounted to a groove in the inner surface of the outer race and extending toward the inner race with a further sealing element
    • F16C33/7863—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members mounted to a groove in the inner surface of the outer race and extending toward the inner race with a further sealing element mounted to the inner race, e.g. a flinger to use centrifugal effect
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
    • F16C33/72—Sealings
    • F16C33/76—Sealings of ball or roller bearings
    • F16C33/78—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members
    • F16C33/7816—Details of the sealing or parts thereof, e.g. geometry, material
    • F16C33/782—Details of the sealing or parts thereof, e.g. geometry, material of the sealing region
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C19/00—Bearings with rolling contact, for exclusively rotary movement
    • F16C19/02—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows
    • F16C19/04—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for radial load mainly
    • F16C19/08—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for radial load mainly with two or more rows of balls
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C2361/00—Apparatus or articles in engineering in general
    • F16C2361/63—Gears with belts and pulleys

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To enhance reliability of a rolling bearing by providing a sealing device for an rolling bearing which can effectively exhaust foreign matter such as water and dust entering a gap between a seal and an slinger to enhance further sealing performance. <P>SOLUTION: The sealing device for the rolling bearing is provided with the seal 20 which is fixed to an outer ring 14 and rotates with the outer ring 14 and the slinger 30 which is arranged outside the seal 20. Furthermore, an outer side surface of the bearing of the seal 20 is configured as a flat surface 28 and a radial protuberance 29 is formed on the flat surface 28 with an inclination with respect to the radial direction. In addition, the protuberance 29 is positioned forward in the rotating direction of the seal 20 on the inside diameter side of the seal 20 and rearward in the rotating direction of the seal 20 on the outside diameter side of the seal 20. The protuberance 29 can exhaust the foreign matter entering the gap between the seal 20 and the slinger 30 by rotation of the seal 20. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

この発明は転がり軸受用密封装置に関する。具体的には内輪と外輪の間をシールで覆い、シールの外側にスリンガを設けた転がり軸受用密封装置に関する。   The present invention relates to a rolling bearing sealing device. Specifically, the present invention relates to a rolling bearing sealing device in which a space between an inner ring and an outer ring is covered with a seal, and a slinger is provided outside the seal.

自動車のエンジン周辺補機、例えばプーリには、密封形のグリース封入玉軸受けが使用されている。この種の転がり軸受は、円環状のシールで外輪と内輪の間を覆う密封装置を備えている。そして、この種の転がり軸受に組み付けられるシールに必要な密封性能は、軸受内部のグリースの漏れ防止及び外部からの水や塵の軸受内部への侵入防止である。
ここで、軸受は内輪と外輪が相対回転するため、例えば、シールの外周を外輪に固定しシールの内周にシールリップを設けて内輪に摺接させて、内輪と外輪の相対的な回転を許容する必要がある。そして、この種の軸受は高速回転で使用されるので、シールの摺接部の発熱を防ぐために、シールリップは少量のしめしろを有する軽接触タイプとする必要がある。
そのため、シールだけでは外部からの水や塵に対する密封性が不足しており、水や塵がシールリップと内輪の間から軸受内部に進入することを防止することが困難である。
そこで、シールの外側にスリンガと呼ばれる遮蔽板を設けて水や塵がシールに直接当たらない構成とした密封装置が提案されている。 Sealed grease-filled ball bearings are used in auxiliary accessories for automobile engines, such as pulleys. This type of rolling bearing is provided with a sealing device that covers an outer ring and an inner ring with an annular seal. The sealing performance necessary for the seal assembled in this type of rolling bearing is to prevent grease from leaking inside the bearing and to prevent water and dust from entering the bearing from the outside.
Here, since the inner ring and the outer ring rotate relative to each other in the bearing, for example, the outer periphery of the seal is fixed to the outer ring, a seal lip is provided on the inner periphery of the seal, and the inner ring and the outer ring are slidably contacted, so Need to be tolerated. Since this type of bearing is used at high speed rotation, the seal lip needs to be a light contact type having a small amount of interference to prevent heat generation at the sliding contact portion of the seal.
For this reason, the seal alone is insufficient in sealing performance against water and dust from the outside, and it is difficult to prevent water and dust from entering the inside of the bearing from between the seal lip and the inner ring.
Therefore, a sealing device has been proposed in which a shielding plate called a slinger is provided outside the seal so that water and dust do not directly hit the seal.

例えば、特開平１１−２３０１７９号公報（特許文献１）には、従来技術のシールとスリンガを備えた転がり軸受が記載されている（特許文献１の図１参照）。図５に特許文献１の図１に第一実施形態として記載されたものとほぼ同一の転がり軸受を示す。特許文献１の第一実施形態に記載された転がり軸受１は、内輪２と外輪３の間にわたって装着されたシール５が、外輪の内径面に設けられたシール溝３ａに一方側が装着され、内輪２の外径面に設けられたシール溝２ａに他方側が接触する構造とされている。そして、シール５の軸方向外方にスリンガタイプのシールド板６が内輪２と止め輪９の間に挟持装着されている（特許文献１の段落０００７，段落０００８参照）。
そして、特許文献１には、転がり軸受１にはシール５を覆ったシールド板６が装着されているためシール５自体が直接水や異物等と衝突することがないこと、シール５とシールド板６の間にラビリンスが形成されて防水および防塵性が向上すること、シール５が外輪３と共に回転するためシール５の遠心力により軸受外部へ水と異物がとばされること、が記載されている（特許文献１の段落０００９参照）。
特開平１１−２３０２７９号公報 For example, Japanese Patent Application Laid-Open No. 11-230179 (Patent Document 1) describes a rolling bearing provided with a conventional seal and slinger (see FIG. 1 of Patent Document 1). FIG. 5 shows a rolling bearing substantially the same as that described in FIG. 1 of Patent Document 1 as the first embodiment. In the rolling bearing 1 described in the first embodiment of Patent Document 1, a seal 5 mounted between an inner ring 2 and an outer ring 3 is mounted on one side in a seal groove 3a provided on an inner diameter surface of the outer ring. 2 has a structure in which the other side is in contact with a seal groove 2a provided on the outer diameter surface of No. 2. A slinger type shield plate 6 is sandwiched and attached between the inner ring 2 and the retaining ring 9 outside the seal 5 in the axial direction (see paragraphs 0007 and 0008 of Patent Document 1).
In Patent Document 1, a shield plate 6 covering the seal 5 is attached to the rolling bearing 1, so that the seal 5 itself does not directly collide with water, foreign matter, etc., and the seal 5 and the shield plate 6. A labyrinth is formed between the outer ring 3 and the seal 5 is rotated together with the outer ring 3, so that water and foreign matter are blown out of the bearing by the centrifugal force of the seal 5 (patent). (See paragraph 0009 of document 1).
Japanese Patent Laid-Open No. 11-230279

確かに、従来技術による、シール、スリンガ、シールとスリンガのラビリンス構造はそれぞれに転がり軸受の密封構造として効果が期待できる。よって、これらの組み合わせの相乗効果により転がり軸受の密封性を向上させることができる。
しかしながら、転がり軸受は高い信頼性の要求される部品であり、更なる信頼性の向上のために、より一層の密封性の向上が求められている。 Certainly, the labyrinth structure of the seal, the slinger, and the seal and the slinger according to the prior art can be expected to be effective as the seal structure of the rolling bearing. Therefore, the sealing performance of the rolling bearing can be improved by a synergistic effect of these combinations.
However, the rolling bearing is a component that requires high reliability, and in order to further improve the reliability, further improvement in sealing performance is required.

そして、従来技術の課題の１つとして、一度シールとスリンガの間に入り込んでしまった水や塵等の異物はこれを軸受の外部へ排除する適当な手段が無いことがあげられる。そして、シールとスリンガの間に入り込んだ異物がシールと内輪との摺接部に達すると、異物がシールと内輪の摺接部を通って軸受内部に侵入するおそれがある。
ここで、特許文献１の段落０００９には、上述の通り、シール５が外輪３と共に回転するためシール５の遠心力により軸受外部へ水と異物がとばされることが記載されている。確かに、シール５に付着した水や異物はシール５の回転による遠心力によってシール５の外径側にとばすことができる。しかし、シール５は図５に示されるように平板的であると解されるため、シール５の回転によってはシール５とシールド板６の間の空気はほとんど撹拌されない。よって、シール５とシールド板６の間に入り込んでシール５に付着していない異物には、シール５の回転はほとんど影響が無く、シール５の回転により異物を軸受の外部へ飛ばす効果は限られたものであると考えられる。 One of the problems of the prior art is that there is no appropriate means for excluding foreign matters such as water and dust once entering between the seal and the slinger. When the foreign matter that has entered between the seal and the slinger reaches the sliding contact portion between the seal and the inner ring, the foreign matter may enter the bearing through the sliding contact portion between the seal and the inner ring.
Here, paragraph 0009 of Patent Document 1 describes that, as described above, since the seal 5 rotates together with the outer ring 3, the centrifugal force of the seal 5 causes water and foreign matter to be discharged to the outside of the bearing. Certainly, water and foreign matter adhering to the seal 5 can be skipped to the outer diameter side of the seal 5 by the centrifugal force generated by the rotation of the seal 5. However, since the seal 5 is understood to be flat as shown in FIG. 5, the air between the seal 5 and the shield plate 6 is hardly agitated by the rotation of the seal 5. Therefore, the foreign matter that enters between the seal 5 and the shield plate 6 and does not adhere to the seal 5 has little effect on the rotation of the seal 5, and the effect of flying the foreign matter to the outside of the bearing by the rotation of the seal 5 is limited. It is thought that

そこで、本発明が解決しようとする課題は、シールとスリンガの間に侵入した水や塵等の異物を効果的に排出できる、より一層密封性が向上した転がり軸受用密封装置を提供し、転がり軸受の信頼性を更に向上させることである。   Therefore, the problem to be solved by the present invention is to provide a rolling bearing sealing device that can effectively discharge foreign matters such as water and dust that have entered between the seal and the slinger, and has further improved sealing performance. This is to further improve the reliability of the bearing.

上記課題を解決するため、本発明に係る転がり軸受用密封装置は、外輪に固定され外輪と共に回転するシールと、該シールの外側に配設されたスリンガとを備え、該シールと該スリンガとの間に形成される隙間が前記スリンガの外径側で軸受の外部に開口されてラビリンスを構成する転がり軸受用密封装置であって、
前記シールの軸受の外側の側面は平坦面とされており、該平坦面には放射状の突起が径方向に対して傾斜して形成され、該突起はシールの内径側でシールの回転方向前方とされシールの外径側でシールの回転方向後方とされており、
該シールの回転により該突起がシールとスリンガの間に入り込んだ異物を排出することを特徴とする。 In order to solve the above-described problems, a rolling bearing sealing device according to the present invention includes a seal fixed to an outer ring and rotating together with the outer ring, and a slinger disposed on the outer side of the seal, and the seal and the slinger A rolling bearing sealing device in which a gap formed therebetween is opened to the outside of the bearing on the outer diameter side of the slinger and constitutes a labyrinth,
The outer side surface of the bearing of the seal is a flat surface, and radial protrusions are formed on the flat surface so as to be inclined with respect to the radial direction. The outer diameter side of the seal is the rear of the seal rotation direction,
By the rotation of the seal, the protrusion discharges foreign matter that has entered between the seal and the slinger.

この発明によれば、シールは外輪に固定され外輪と共に回転するので、シールの軸受外方の平坦面に形成された突起が回転する。そこで、突起がシールとスリンガの間に浮遊している水や塵等の異物に当たることで、突起に異物を付着させて異物を捕集することができる。また、突起の回転により空気が撹拌されるので、水や塵等の異物がシールの平坦面や突起に付着しやすくなり、異物の捕集が促進される。
そして、シールの平坦面に付着した水や塵等の異物は遠心力により平坦面上をシールの回転方向とは逆方向に外径側へと移動する。そして、異物は平坦面上に放射状に形成された突起に当たる。ここで、突起が異物の移動方向で平坦面の内径側から外径側に延びているため、異物は突起に沿って平坦面上で外径側への移動が確実となり、外径側への移動が促進される。また、突起に当たった異物は凝集し粒径が大きくなるので、遠心力による異物の平坦面の外径側への移動が促進される。
よって、シールとスリンガの間に侵入した水や塵等の異物を効果的に排出することができるため、転がり軸受の密封性を向上させることができ、転がり軸受の信頼性を更に向上させることができる。 According to this invention, since the seal is fixed to the outer ring and rotates together with the outer ring, the protrusion formed on the flat surface outside the bearing of the seal rotates. Therefore, the foreign matter can be collected by attaching the foreign matter to the projection when the projection hits the foreign matter such as water or dust floating between the seal and the slinger. In addition, since the air is agitated by the rotation of the protrusion, foreign matters such as water and dust are likely to adhere to the flat surface of the seal and the protrusion, and the collection of the foreign matter is promoted.
Then, foreign matters such as water and dust adhering to the flat surface of the seal move to the outer diameter side in the direction opposite to the rotation direction of the seal on the flat surface by centrifugal force. And a foreign material hits the processus | protrusion formed radially on the flat surface. Here, since the protrusion extends from the inner diameter side of the flat surface to the outer diameter side in the movement direction of the foreign matter, the foreign matter is reliably moved along the protrusion on the flat surface to the outer diameter side, Movement is promoted. In addition, since the foreign matter that hits the projections aggregates and increases in particle size, the movement of the foreign matter toward the outer diameter side of the flat surface by centrifugal force is promoted.
Therefore, foreign matters such as water and dust that have entered between the seal and the slinger can be effectively discharged, so that the sealing performance of the rolling bearing can be improved, and the reliability of the rolling bearing can be further improved. it can.

この発明によれば、シールの軸受外方の平坦面に形成された突起の回転により、突起がシールとスリンガの間に浮遊している水や塵等の異物に当たり、また、突起の回転により空気が撹拌されることで、水や塵等の異物のシールの平坦面への付着が促進され、異物の捕集が促進される。
そして、シールの回転による遠心力と、突起の異物を凝集させて平坦面の外径側への移動を促進させる働きにより、平坦面に付着した異物を効果的に転がり軸受の外部へ排出することができる。よって、転がり軸受の密封性を向上させることができ、転がり軸受の信頼性を更に向上させることができる。 According to this invention, the protrusion hits a foreign matter such as water or dust floating between the seal and the slinger due to the rotation of the protrusion formed on the flat surface outside the bearing of the seal. Is agitated, the adhesion of foreign matters such as water and dust to the flat surface of the seal is promoted, and the collection of foreign matters is promoted.
And, by the action of aggregating the centrifugal force due to the rotation of the seal and the foreign matter of the protrusions to promote the movement of the flat surface to the outer diameter side, the foreign matter adhering to the flat surface can be effectively discharged to the outside of the rolling bearing. Can do. Therefore, the sealing performance of the rolling bearing can be improved, and the reliability of the rolling bearing can be further improved.

以下、本発明を実施するための最良の形態について説明する。
図１に本発明の一実施例における転がり軸受用密封装置を備えた転がり軸受１０を使用するプーリ４０の部分断面図を示す。そして、図２に図１における転がり軸受用密封装置に関する部分の拡大図を示す。
図１および図２に示すように、転がり軸受１０はプーリ４０に使用される外輪回転タイプの複列玉軸受であって、内輪１２、外輪１４、複列の球１６、球１６を保持する保持器１８、内輪１２と外輪１４の間を覆うシール２０、シール２０の軸受外側に設けられたスリンガ３０から構成されている。そして、これらの構成要素のうちで、内輪１２、外輪１４、シール２０およびスリンガ３０が転がり軸受１０を密封する密封装置を形成している。 Hereinafter, the best mode for carrying out the present invention will be described.
FIG. 1 shows a partial sectional view of a pulley 40 using a rolling bearing 10 provided with a rolling bearing sealing device according to an embodiment of the present invention. FIG. 2 shows an enlarged view of a portion related to the rolling bearing sealing device in FIG.
As shown in FIGS. 1 and 2, the rolling bearing 10 is an outer ring rotation type double row ball bearing used for the pulley 40, and holds the inner ring 12, the outer ring 14, the double row ball 16, and the ball 16. 18, a seal 20 that covers the space between the inner ring 12 and the outer ring 14, and a slinger 30 that is provided outside the bearing of the seal 20. Among these components, the inner ring 12, the outer ring 14, the seal 20, and the slinger 30 form a sealing device that seals the rolling bearing 10.

シール２０は芯金２２をゴムシールで覆った円環状である。そして、シール２０の外周には固定部２４が形成され、固定部２４が外輪１４の内径面に設けられたシール溝１５に装着されて、シール２０が外輪１４の内径面に固定されている。そして、シール２０の内周にはシールリップ２６が形成され、シールリップ２６が内輪１２の外径側に設けられた摺接部１３に摺接している。そして、シール２０が外輪１４と共に高速回転すると、シールリップ２６が内輪１２の摺接部１３に摺接しながら高速回転する。そのため、シールリップ２６は摺接部１３に対して軽接触とされている。   The seal 20 has an annular shape in which a core metal 22 is covered with a rubber seal. A fixing portion 24 is formed on the outer periphery of the seal 20. The fixing portion 24 is attached to a seal groove 15 provided on the inner diameter surface of the outer ring 14, and the seal 20 is fixed to the inner diameter surface of the outer ring 14. A seal lip 26 is formed on the inner periphery of the seal 20, and the seal lip 26 is in sliding contact with a sliding contact portion 13 provided on the outer diameter side of the inner ring 12. When the seal 20 rotates at a high speed together with the outer ring 14, the seal lip 26 rotates at a high speed while being in sliding contact with the sliding contact portion 13 of the inner ring 12. Therefore, the seal lip 26 is in light contact with the sliding contact portion 13.

スリンガ３０は円環状の金属板であって、内周の端が転がり軸受１０の内側向きに円筒状に曲げられて円筒部３２が形成されており、円筒部３２が内輪１２の外径側に圧入されて、スリンガ３０が内輪１２に固定されている。そして、スリンガ３０の外周の端の先端部３４はプーリ４０の鍔４２の端面との間に隙間を形成している。   The slinger 30 is an annular metal plate, and an inner peripheral end is bent in a cylindrical shape toward the inside of the rolling bearing 10 to form a cylindrical portion 32, and the cylindrical portion 32 is formed on the outer diameter side of the inner ring 12. The slinger 30 is fixed to the inner ring 12 by being press-fitted. And the front-end | tip part 34 of the outer periphery end of the slinger 30 forms the clearance gap between the end surfaces of the collar 42 of the pulley 40. FIG.

図３にシール２０の軸受外側の面の外観図を示す。前述の通りシール２０の外周には固定部２４が形成され、内周にはシールリップ２６が形成されている。そして、シール２０の径方向の中央部には軸受の外側に軸受の回転軸に垂直な円環状の平坦面２８が形成されている。そして、図３に示すように、平坦面２８には放射状の突起２９が放射方向に対して傾斜して形成されており、突起２９はシール２０の内径側でシール２０の回転方向前方とされシール２０の外径側でシール２０の回転方向後方とされている。なお、突起２９は外径側の端では放射方向にほぼ平行とされている。図４に図３のＡ−Ａ位置における断面図を示す。図４に示すように突起２９は回転方向前方の側の傾斜が回転方向後方の側の傾斜よりも急な山型とされている。なお、突起２９の平坦面２８からの高さは突起２９の長さ方向で一定とされている。   FIG. 3 shows an external view of the outer surface of the bearing of the seal 20. As described above, the fixing portion 24 is formed on the outer periphery of the seal 20, and the seal lip 26 is formed on the inner periphery. An annular flat surface 28 perpendicular to the rotation axis of the bearing is formed outside the bearing at the radial center of the seal 20. As shown in FIG. 3, radial protrusions 29 are formed on the flat surface 28 so as to be inclined with respect to the radial direction, and the protrusions 29 are positioned on the inner diameter side of the seal 20 in front of the seal 20 in the rotation direction. The outer diameter side of 20 is the rear of the seal 20 in the rotational direction. The protrusion 29 is substantially parallel to the radial direction at the end on the outer diameter side. FIG. 4 shows a cross-sectional view at the position AA in FIG. As shown in FIG. 4, the protrusion 29 has a mountain shape in which the inclination on the front side in the rotation direction is steeper than the inclination on the rear side in the rotation direction. Note that the height of the protrusion 29 from the flat surface 28 is constant in the length direction of the protrusion 29.

そして、図２に示すように、スリンガ３０の径方向の中央部には軸受の内側に軸受の回転軸に垂直な円環状の平坦部３６がシール２０の平坦面２８に近接して形成されている。そして、スリンガ３０の外径側で軸受の外部に開口されて、スリンガ３０の平坦部３６とシール２０の平坦面２８でラビリンスを構成している。
なお、シール２０の平坦面２８上の突起２９とスリンガ３０の平坦部３６は非接触とされている。 As shown in FIG. 2, an annular flat portion 36 perpendicular to the rotation axis of the bearing is formed in the central portion in the radial direction of the slinger 30 in the vicinity of the flat surface 28 of the seal 20. Yes. A labyrinth is formed by the flat portion 36 of the slinger 30 and the flat surface 28 of the seal 20, which is opened to the outside of the bearing on the outer diameter side of the slinger 30.
The protrusion 29 on the flat surface 28 of the seal 20 and the flat portion 36 of the slinger 30 are not in contact with each other.

転がり軸受１０では、外輪１４が回転すると外輪１４に固定されたシール２０は外輪１４と共に回転する。すると、シール２０の回転に伴って平坦面２８に形成された突起２９が回転する。そこで、突起２９がシール２０の平坦面２８とスリンガ３０の平坦部３６の間に入り込んで浮遊している水や塵等の異物に当たることで突起２９により異物を捕集することができる。また、突起２９の回転により空気が撹拌されるので、水や塵等の異物のシール２０の平坦面２８への付着が促進される。   In the rolling bearing 10, when the outer ring 14 rotates, the seal 20 fixed to the outer ring 14 rotates together with the outer ring 14. Then, as the seal 20 rotates, the projection 29 formed on the flat surface 28 rotates. Accordingly, the protrusion 29 enters between the flat surface 28 of the seal 20 and the flat portion 36 of the slinger 30 and hits a foreign substance such as water or dust that is floating, so that the foreign substance can be collected by the protrusion 29. Further, since the air is agitated by the rotation of the protrusion 29, adhesion of foreign matters such as water and dust to the flat surface 28 of the seal 20 is promoted.

そして、シール２０の平坦面２８に付着した水や塵等の異物は遠心力により平坦面２８上をシール２０の回転方向とは逆方向に外径側へと移動する。そして、異物は平坦面２８上に放射状に形成された突起２９に当たる。ここで、突起２９が異物の移動方向で平坦面２８の内径側から外径側に延びているため、異物は突起２９に沿って平坦面２８上で外径側への移動が確実となり、外径側への移動が促進される。また、突起２９に当たった異物は凝集し粒径が大きくなるので、遠心力による異物の平坦面２８の外径側への移動が促進される。よって、シール２０とスリンガ３０の間に侵入した水や塵等の異物を効果的に排出することができる。   Then, foreign matters such as water and dust adhering to the flat surface 28 of the seal 20 move on the flat surface 28 to the outer diameter side in the direction opposite to the rotation direction of the seal 20 by centrifugal force. The foreign matter hits the protrusions 29 formed radially on the flat surface 28. Here, since the projection 29 extends from the inner diameter side of the flat surface 28 to the outer diameter side in the movement direction of the foreign matter, the foreign matter is surely moved along the projection 29 on the flat surface 28 to the outer diameter side. Movement to the radial side is promoted. In addition, since the foreign matter that hits the protrusion 29 aggregates and increases in particle size, the movement of the foreign matter toward the outer diameter side of the flat surface 28 by centrifugal force is promoted. Therefore, foreign matters such as water and dust that have entered between the seal 20 and the slinger 30 can be effectively discharged.

そして、シール２０の平坦面２８に突起２９を設けることにより、スリンガ３０の平坦部３６との隙間を絞ることができるため、この隙間から水や塵等の異物がシール２０のシールリップ２６側へ侵入することを防止する効果がある。また、隙間を絞ることにより、スリンガ３０の平坦部３６に付着した異物をシール２０の平坦面２８の突起２９で掻き取って排出することができる。   Further, by providing the projection 29 on the flat surface 28 of the seal 20, the gap with the flat portion 36 of the slinger 30 can be narrowed, so that foreign matters such as water and dust can pass from this gap to the seal lip 26 side of the seal 20. There is an effect to prevent intrusion. Further, by narrowing the gap, the foreign matter adhering to the flat portion 36 of the slinger 30 can be scraped and discharged by the protrusion 29 on the flat surface 28 of the seal 20.

このように、転がり軸受１０では、シール２０とスリンガ３０の間に侵入した水や塵等の異物を効果的に排出することができ、転がり軸受１０の密封性を向上させることができる。そのため、グリースの乳化防止、軌道面及び球１６が錆びることによる異音の発生や軌道面及び球１６の剥離の防止が図られる。また、異物によるシールリップ２６の摩耗が防止され、内輪１２の摺接部１３での錆の発生が防止される。よって、転がり軸受１０の信頼性を更に向上させることができる。   Thus, in the rolling bearing 10, foreign matters such as water and dust that have entered between the seal 20 and the slinger 30 can be effectively discharged, and the sealing performance of the rolling bearing 10 can be improved. For this reason, it is possible to prevent the emulsification of grease, the generation of abnormal noise due to the rubbing of the raceway surface and the ball 16 and the separation of the raceway surface and the ball 16. Further, wear of the seal lip 26 due to foreign matters is prevented, and the occurrence of rust at the sliding contact portion 13 of the inner ring 12 is prevented. Therefore, the reliability of the rolling bearing 10 can be further improved.

上記の実施例では、スリンガ３０の先端部３４がプーリ４０の鍔４２との間で隙間を形成する構成としているが、外輪１４を内輪１２とほぼ等幅とし、スリンガ３０の先端部３４が外輪１４の内径面との間で隙間を形成する構成としても良い。
また、上記の実施例ではスリンガ３０を内輪１２に圧入して内輪１２に固定する構成としているが、スリンガ３０の内輪１２側の端を内輪１２の側面と軸に固定された止め輪で挟持する構成としても良い。 In the above embodiment, the tip 34 of the slinger 30 forms a gap with the flange 42 of the pulley 40. However, the outer ring 14 is substantially equal in width to the inner ring 12, and the tip 34 of the slinger 30 is the outer ring. It is good also as a structure which forms a clearance gap between 14 inner diameter surfaces.
In the above embodiment, the slinger 30 is press-fitted into the inner ring 12 and fixed to the inner ring 12. However, the end of the slinger 30 on the inner ring 12 side is sandwiched between the side surface of the inner ring 12 and a retaining ring fixed to the shaft. It is good also as a structure.

上記の実施例ではプーリに使用する外輪回転タイプの複列玉軸受の例を示したが、本発明に係る転がり軸受用密封装置の用途はプーリ用に限られない。また、転がり軸受は複列玉軸受に限られない。本発明に係る転がり軸受用密封装置は外輪回転タイプの転がり軸受一般に適用できるものである。
その他、本発明に係る転がり軸受用密封装置はその発明の思想の範囲で、各種の形態で実施できるものである。 In the above embodiment, an example of a double row ball bearing of the outer ring rotation type used for the pulley is shown, but the application of the rolling bearing sealing device according to the present invention is not limited to the pulley. Further, the rolling bearing is not limited to a double row ball bearing. The sealing device for a rolling bearing according to the present invention can be applied to an outer ring rotating type rolling bearing in general.
In addition, the rolling bearing sealing device according to the present invention can be implemented in various forms within the scope of the concept of the invention.

一実施例における転がり軸受用密封装置を備えた軸受を使用したプーリの部分断面図である。It is a fragmentary sectional view of the pulley using the bearing provided with the sealing device for rolling bearings in one Example. 図１における転がり軸受用密封装置に関する部分の拡大図である。It is an enlarged view of the part regarding the sealing device for rolling bearings in FIG. 一実施例におけるシールの軸受外側の面の外観図である。It is an external view of the surface outside the bearing of the seal in one example. 図３のＡ−Ａ位置にける断面を示す図である。It is a figure which shows the cross section in the AA position of FIG. 従来技術を示す図である。It is a figure which shows a prior art.

符号の説明Explanation of symbols

１０ 転がり軸受
１２ 内輪
１３ 摺接部
１４ 外輪
１５ シール溝
１６ 球
１８ 保持器
２０ シール
２２ 芯金
２４ 固定部
２６ シールリップ
２８ 平坦面
２９ 突起
３０ スリンガ
３２ 円筒部
３４ 先端部
３６ 平坦部
４０ プーリ
４２ 鍔


DESCRIPTION OF SYMBOLS 10 Rolling bearing 12 Inner ring 13 Sliding contact part 14 Outer ring 15 Seal groove 16 Ball 18 Cage 20 Seal 22 Core metal 24 Fixing part 26 Seal lip 28 Flat surface 29 Projection 30 Slinger 32 Cylindrical part 34 Tip part 36 Flat part 40 Pulley 42 鍔

Claims (1)

外輪に固定され外輪と共に回転するシールと、該シールの外側に配設されたスリンガとを備え、該シールと該スリンガとの間に形成される隙間が前記スリンガの外径側で軸受の外部に開口されてラビリンスを構成する転がり軸受用密封装置であって、
前記シールの軸受の外側の側面は平坦面とされており、該平坦面には放射状の突起が径方向に対して傾斜して形成されており、
該突起の傾斜方向は該シールの回転に対してシールとスリンガの間に入り込んだ異物が軸受の径方向の外方へ排出される方向とされていることを特徴とする転がり軸受用密閉装置。

A seal fixed to the outer ring and rotating together with the outer ring; and a slinger disposed outside the seal, and a gap formed between the seal and the slinger is outside the bearing on the outer diameter side of the slinger. A rolling bearing sealing device that is opened to form a labyrinth,
The outer side surface of the bearing of the seal is a flat surface, and radial protrusions are formed on the flat surface so as to be inclined with respect to the radial direction.
2. A rolling bearing sealing device according to claim 1, wherein the inclination direction of the protrusion is a direction in which foreign matter that has entered between the seal and the slinger with respect to the rotation of the seal is discharged outward in the radial direction of the bearing.

JP2008042815A 2008-02-25 2008-02-25 Sealing device for rolling bearing Pending JP2009197969A (en)

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Application Number Priority Date Filing Date Title
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Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
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Publication Number Publication Date
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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2012052101A1 (en) * 2010-10-18 2012-04-26 Schaeffler Technologies AG & Co. KG Rolling bearing arrangement
CN102996651A (en) * 2012-12-10 2013-03-27 中山市盈科轴承制造有限公司 Three-lip sealed bearing with protective ring
CN103629246A (en) * 2013-09-27 2014-03-12 浙江蓝翔轴承有限公司 Double-sealing bearing
WO2019110035A1 (en) * 2017-12-07 2019-06-13 Schaeffler Technologies AG & Co. KG Sealed rolling bearing and method for operating a rolling bearing

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2012052101A1 (en) * 2010-10-18 2012-04-26 Schaeffler Technologies AG & Co. KG Rolling bearing arrangement
CN102996651A (en) * 2012-12-10 2013-03-27 中山市盈科轴承制造有限公司 Three-lip sealed bearing with protective ring
CN103629246A (en) * 2013-09-27 2014-03-12 浙江蓝翔轴承有限公司 Double-sealing bearing
CN103629246B (en) * 2013-09-27 2016-01-20 浙江蓝翔轴承有限公司 Double sealed bearing
WO2019110035A1 (en) * 2017-12-07 2019-06-13 Schaeffler Technologies AG & Co. KG Sealed rolling bearing and method for operating a rolling bearing

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