JP5636819B2 - Rolling bearing - Google Patents

Rolling bearing Download PDF

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JP5636819B2
JP5636819B2 JP2010189244A JP2010189244A JP5636819B2 JP 5636819 B2 JP5636819 B2 JP 5636819B2 JP 2010189244 A JP2010189244 A JP 2010189244A JP 2010189244 A JP2010189244 A JP 2010189244A JP 5636819 B2 JP5636819 B2 JP 5636819B2
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inner ring
seal
bearing
rolling bearing
bottom wall
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JP2012047248A (en
JP2012047248A5 (en
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乃一 北川
乃一 北川
渡邊　聡
聡 渡邊
圭司 安永
圭司 安永
石和田　博
博 石和田
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NSK Ltd
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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
    • F16C33/7843—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 single annular sealing disc
    • F16C33/7846—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 single annular sealing disc with a gap between the annular disc and the inner race
    • 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
    • F16C19/06—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 a single row or 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
    • F16C2380/00—Electrical apparatus
    • F16C2380/26—Dynamo-electric machines or combinations therewith, e.g. electro-motors and generators

Description

本発明は、非接触シールを採用した転がり軸受、特に長時間の軸受回転が必要となる場所、例えば住宅の居室、寝室、台所やトイレ等に設置される換気モータに適する転がり軸受に関するものである。   The present invention relates to a rolling bearing employing a non-contact seal, and more particularly to a rolling bearing suitable for a ventilation motor installed in a place where a long-time bearing rotation is required, such as a residential room, bedroom, kitchen or toilet. .

従来、換気モータの運転に伴って周囲に浮遊している塵埃等がモータ内部に侵入する。この塵埃等が換気モータ用転がり軸受のシールド板の内周縁と内輪外周面のシール溝との間に存在するラビリンス隙間を通じて空間内に入り込むと、転がり軸受の音響性能が悪くなり、また、この空間内に充填しているグリースが劣化し、転がり軸受の寿命が低下する場合がある。   Conventionally, dust or the like floating around the motor enters the motor as the ventilation motor is operated. If this dust enters the space through the labyrinth gap that exists between the inner peripheral edge of the shield plate of the ventilation motor rolling bearing and the outer peripheral surface of the inner ring, the acoustic performance of the rolling bearing deteriorates. The grease filled inside may deteriorate and the life of the rolling bearing may be reduced.

上記空間の両端開口部を塞ぐ密封部材として、非接触型のシールド板に代えて、接触型のシール板を使用すれば、上記グリースの劣化を抑え、転がり軸受の寿命延長を図れる。但し、接触型のシール板を組み込んだ転がり軸受は回転トルクが大きくなる為、この転がり軸受を組み込んだモータを回転させるための消費電力が多くなる。従って、防塵と摩擦抵抗低減の両立性を解決することは、課題であった。   If a contact-type seal plate is used instead of a non-contact type shield plate as a sealing member for closing both end openings of the space, the deterioration of the grease can be suppressed and the life of the rolling bearing can be extended. However, since the rolling bearing incorporating the contact type seal plate has a large rotational torque, the power consumption for rotating the motor incorporating the rolling bearing increases. Therefore, it has been a problem to solve the compatibility of dust prevention and frictional resistance reduction.

そこで、特許文献１には、リング状の金属板を曲げ加工した密封シールを備えるファンモータ用転がり軸受が開示されている。この転がり軸受は、内輪外周面と内輪シール溝の底部との間隔が０．１〜０．２ｍｍとした内輪非接触タイプシールを有するので、シールと内輪外周面との摩擦をなくすと共に、一定な防塵性能を確保できる。   Thus, Patent Document 1 discloses a fan motor rolling bearing provided with a hermetic seal obtained by bending a ring-shaped metal plate. Since this rolling bearing has an inner ring non-contact type seal in which the distance between the outer peripheral surface of the inner ring and the bottom of the inner ring seal groove is 0.1 to 0.2 mm, friction between the seal and the outer peripheral surface of the inner ring is eliminated, and a constant Dustproof performance can be secured.

また、特許文献２には、ＯＡ機器の冷却ファンモータに組み込まれる転がり軸受が開示されている。該転がり軸受は、内輪外周面とシール内径部との間隔を０．０８ｍｍ以下、シールの軸方向厚さが０．３０ｍｍ以上と規定されているので、一定な防塵効果を有する。   Patent Document 2 discloses a rolling bearing incorporated in a cooling fan motor of an OA device. The rolling bearing has a certain dustproof effect because the distance between the outer peripheral surface of the inner ring and the inner diameter portion of the seal is specified to be 0.08 mm or less and the axial thickness of the seal is 0.30 mm or more.

特開２００４−２１８７８９号公報JP 2004-218789 A 特開２００４−２５７５１９号公報JP 2004-257519 A

近年建築基準法の改正により、住宅内では２４時間の室内換気が義務付けられ、これに伴い、住宅用室内換気扇の需要が高まり、住宅用室内換気扇の夜間運転の為の低騒音化や長時間稼動の為の低消費電力が要求されている。従って、室内換気用モータは、その軸受の静音性や低摩擦抵抗が要求され、そのほか、浴室やトイレなどの湿度高い場所にも使用可能なことが要求される。   In recent years, due to the revision of the Building Standard Law, indoor ventilation for 24 hours has become mandatory in the house. As a result, the demand for indoor ventilation fans for houses has increased, resulting in low noise and long-time operation of residential indoor ventilation fans. Therefore, low power consumption is required. Accordingly, the indoor ventilation motor is required to have low noise and low frictional resistance of its bearing, and in addition, it must be usable in places with high humidity such as bathrooms and toilets.

又、最近非喫煙者の受動喫煙を防止する対策への関心が高まり、公衆喫煙所の数が増えたことで、喫煙所に設置される分煙機の需要が増加している。分煙機のブロアファンモータは、タバコの煙が侵入しやすい環境で長時間稼動の為、ブロアファンモータ用軸受の防塵性能や低摩擦抵抗が要求される。   Recently, interest in measures to prevent passive smoking by non-smokers has increased, and the number of public smoking areas has increased, increasing the demand for smoke machines installed in smoking areas. Since the blower fan motor of the smoke separator operates for a long time in an environment where tobacco smoke is likely to enter, the dustproof performance and low frictional resistance of the blower fan motor bearing are required.

しかしながら、特許文献１の密封シールは金属板で作られている為、内径側の設計自由度が無いため内輪シール溝との間隔を狭めるのに限界がある。又、特許文献２の密封シールは、射出成形で成形された樹脂成形品であるので、軸受へ挿入する際に、位置決め精度が出にくく、内輪シール溝との間隔をコントロールするのが困難である。   However, since the hermetic seal of Patent Document 1 is made of a metal plate, there is no design freedom on the inner diameter side, so there is a limit to narrowing the distance from the inner ring seal groove. Further, since the hermetic seal of Patent Document 2 is a resin molded product molded by injection molding, positioning accuracy is difficult to obtain when inserted into the bearing, and it is difficult to control the distance from the inner ring seal groove. .

従って、シールと内輪外周面との間隔を如何に安定に維持し、非接触シールを採用する軸受の防塵性能をさらに向上することについては、検討の余地がある。   Accordingly, there is room for study on how to stably maintain the distance between the seal and the outer peripheral surface of the inner ring and further improve the dustproof performance of the bearing that employs the non-contact seal.

上記の課題を解決するために、本発明の請求項１に係る発明は、
軸受の内輪と外輪の間を封止し、芯金と弾性体とからなる環状のシール部材を備える転がり軸受であって、
前記弾性体は、前記芯金より径方向に沿って前記芯金の本体部分と同じ方向へ延出する延出部分を有し、
前記内輪は、内輪内径が１０ｍｍ以下であり、内輪外周面の軸線方向両端部に内輪溝部が形成され、
前記外輪は、外輪内周面の軸線方向両端部にシール嵌合溝が形成され、該シール嵌合溝に前記シール部材の外周部が嵌合され、
前記延出部分の内周部の先端に形成されたリップ部が、前記内輪溝部と接触せず、
前記内輪溝部は、前記内輪の軸線方向両端面から軸線方向に沿って、平坦な底壁と、該底壁から凸設された内側壁とが形成され、
前記リップ部は、軸受内部に向かって折り曲げられ、前記内輪の前記底壁及び前記内側壁と対向している部分が断面円弧状となっていることを特徴とする。
また、本発明の請求項２に係る発明は、シール部材のリップ部と該内側壁との軸方向隙間Δａ１若しくは最小隙間Δａ２が０．１４ｍｍ〜０．２６ｍｍであることを特徴とする。 In order to solve the above problem, the invention according to claim 1 of the present invention provides:
Sealing between the inner ring and the outer ring of the bearing, a rolling bearing comprising an annular sealing member ing from a metal core and an elastic body,
The elastic body, have a extended portion extending along said radial direction from the metal core in the same direction as the body portion of the core metal,
The inner ring has an inner ring inner diameter of 10 mm or less, and inner ring groove portions are formed at both axial ends of the outer peripheral surface of the inner ring,
In the outer ring, seal fitting grooves are formed at both axial ends of the inner peripheral surface of the outer ring, and the outer periphery of the seal member is fitted into the seal fitting groove,
The lip portion formed at the tip of the inner peripheral portion of the extending portion does not contact the inner ring groove portion,
The inner ring groove portion is formed with a flat bottom wall and an inner wall projecting from the bottom wall along the axial direction from both axial end surfaces of the inner ring.
The lip portion is bent toward the inside of the bearing , and a portion of the inner ring facing the bottom wall and the inner wall has an arcuate cross section .
The invention according to claim 2 of the present invention is characterized in that the axial gap Δa 1 or the minimum gap Δa 2 between the lip portion of the seal member and the inner wall is 0.14 mm to 0.26 mm.

本発明の請求項３に係る転がり軸受は、内輪溝部には底壁が形成され、前記シール部材のリップ部と前記内輪との径方向隙間Δｒが０．０５ｍｍ〜０．１５ｍｍであることを特徴とする。 In the rolling bearing according to claim 3 of the present invention, a bottom wall is formed in the inner ring groove portion, and a radial clearance Δr between the lip portion of the seal member and the inner ring is 0.05 mm to 0.15 mm. And

本発明の請求項４に係る転がり軸受は、転がり軸受はファンモータ用玉軸受であることを特徴とする。 The rolling bearing according to claim 4 of the present invention is characterized in that the rolling bearing is a ball bearing for a fan motor.

本発明の転がり軸受は、２４時間使用しても静かに回転可能となり、かつ防塵性能と低トルク性能を兼備えている。   The rolling bearing of the present invention can rotate silently even if it is used for 24 hours, and has both dustproof performance and low torque performance.

本発明の第1の実施形態に係るシール付き転がり軸受の断面図である。1 is a cross-sectional view of a rolling bearing with a seal according to a first embodiment of the present invention. 本発明の第２の実施形態に係るシール付き転がり軸受の断面図である。It is sectional drawing of the rolling bearing with a seal | sticker which concerns on the 2nd Embodiment of this invention.

[第１の実施形態]
図１は、本発明の第１の実施形態を示している。本例のシールリング付転がり軸受Ａは、内径Φ５ｍｍ，外径Φ１３ｍｍの玉軸受であり、互いに同心に配置された外輪１及び内輪２と、転動体である玉３と、保持器４とを備える。そして、玉軸受Ａの軸線方向両側端には、内外輪間にグリース等の潤滑剤を封入すると共に、水や粉塵等の侵入を防止するシール構造を構成するためのシール部材である１対のシールリング５が装着されている。 [First embodiment]
FIG. 1 shows a first embodiment of the present invention. The rolling bearing A with a seal ring of this example is a ball bearing having an inner diameter of Φ5 mm and an outer diameter of Φ13 mm, and includes an outer ring 1 and an inner ring 2 that are arranged concentrically with each other, a ball 3 that is a rolling element, and a cage 4. . A pair of seal members that constitute a seal structure that encloses a lubricant such as grease between the inner and outer rings and prevents intrusion of water, dust and the like at both ends in the axial direction of the ball bearing A. A seal ring 5 is attached.

これら各シールリング５は、それぞれ円輪状の芯金５０とゴムの如きエラストマー等の弾性材５１とにより、全体を円輪状に構成している。この様な各シールリング５は、それぞれの弾性材の外周縁部５２を上記外輪１の内周面の軸方向両端部に形成した係止溝１１、１１に係止して、上記外輪１の両端部内周面に支持固定している。   Each of the seal rings 5 is formed in an annular shape by an annular cored bar 50 and an elastic material 51 such as an elastomer such as rubber. Each of such seal rings 5 is configured such that the outer peripheral edge 52 of each elastic material is locked in locking grooves 11 and 11 formed at both axial ends of the inner peripheral surface of the outer ring 1, It is supported and fixed to the inner peripheral surface of both ends.

又、内輪２の外周面の軸方向両端部にシール溝２１が形成され、該シール溝２１は、斜めになっている内側壁２１１と底壁２１２とを備える。各シールリング５には、シール溝２１と接触しないシールリップ部５３が形成され、該シールリップ部５３は、シールリング５の内周縁から内輪２外周面のシール溝２１内に向かって突出されている。   Further, seal grooves 21 are formed at both axial ends of the outer peripheral surface of the inner ring 2, and the seal grooves 21 include an inner wall 211 and a bottom wall 212 that are inclined. Each seal ring 5 is formed with a seal lip portion 53 that does not come into contact with the seal groove 21, and the seal lip portion 53 projects from the inner peripheral edge of the seal ring 5 into the seal groove 21 on the outer peripheral surface of the inner ring 2. Yes.

シールリップ部５３と内輪２の底壁２１２との間には、０．０５ｍｍ〜０．１５ｍｍの径方向隙間Δｒが設けられている。また、シールリップ部５３と内側壁２１１の間には、０．１４ｍｍ〜０．２６ｍｍの軸方向隙間Δａ１が設けられている。尚、軸方向隙間Δａ１は、シールリップ部５３の先端と底壁２１２の上述先端に対応する位置との間の軸方向隙間である。これにより、玉軸受Ａは、僅かな隙間しか有しない為、空気中の塵埃が軸受の内部へ侵入するリスクを低減できる。従って、煙の多い喫煙所での使用等に適する。 A radial clearance Δr of 0.05 mm to 0.15 mm is provided between the seal lip 53 and the bottom wall 212 of the inner ring 2. An axial clearance Δa 1 of 0.14 mm to 0.26 mm is provided between the seal lip portion 53 and the inner wall 211. The axial gap Δa 1 is an axial gap between the tip of the seal lip portion 53 and a position corresponding to the tip of the bottom wall 212. Thereby, since the ball bearing A has only a slight gap, the risk of dust in the air entering the inside of the bearing can be reduced. Therefore, it is suitable for use in smoking areas where there is a lot of smoke.

又、軸受Ａを安定に回転させる為に、軸受Ａをファンモータに取込んだ後、軸受Ａにアキシャル方向の予圧を付与すると、軸方向隙間Δａ１を更に狭くすることが可能である。 In order to stably rotate the bearing A, the axial clearance Δa 1 can be further reduced by applying a preload in the axial direction to the bearing A after the bearing A is taken into the fan motor.

本実施形態の軸受は、シールと内輪が接触しないタイプのシールを採用することで、摩擦抵抗がなくファンモータの電気消費量を低減でき、排気・吸気扇の省エネを実現できる。   The bearing of the present embodiment employs a type of seal in which the seal and the inner ring do not come into contact with each other, so that there is no frictional resistance, the electric consumption of the fan motor can be reduced, and energy saving of the exhaust / intake fan can be realized.

[第２の実施形態]
第２の実施形態に係る軸受Ａ’を、図２を参照しながら説明する。また、本実施形態の軸受Ａ’は、第１の実施形態と同様な構成については、同じ符号を付与し、説明を省略する。 [Second Embodiment]
A bearing A ′ according to a second embodiment will be described with reference to FIG. Further, the bearing A ′ of the present embodiment is given the same reference numeral for the same configuration as that of the first embodiment, and the description thereof is omitted.

シールリップ部５３と内輪２の底壁２１２との間の径方向隙間Δｒが０．０５ｍｍ〜０．１５ｍｍであるのは、第１の実施形態と同様であるが、シールリップ部５３と内側壁２１１の間の最小隙間Δａ２が０．１４ｍｍ〜０．２６ｍｍである。尚、Δａ２はシールリップの突部の曲面から内側壁２１１までの最短距離を意味している。これにより、第１の実施形態の玉軸受Ａと同様に、シールと内輪が接触しないタイプのシールを採用し、摩擦抵抗がなくファンモータの電気消費量を低減でき、排気・吸気扇の省エネに適しているととともに、優れた防塵性を有している。 The radial clearance Δr between the seal lip 53 and the bottom wall 212 of the inner ring 2 is 0.05 mm to 0.15 mm, as in the first embodiment, but the seal lip 53 and the inner wall The minimum gap Δa 2 between 211 is 0.14 mm to 0.26 mm. Δa 2 means the shortest distance from the curved surface of the seal lip protrusion to the inner wall 211. Thus, like the ball bearing A of the first embodiment, a seal of a type in which the seal and the inner ring do not come into contact is adopted, there is no frictional resistance, the electric consumption of the fan motor can be reduced, and the exhaust / intake fan is energy-saving. It is suitable and has excellent dust resistance.

１ 外輪
２ 内輪
２１１ 内側壁
２１２ 底壁
３ 転動体
４ 保持器
５ シールリング
５０ 芯金
５１ 弾性体
５２ 外周縁部
５３ シールリップ部
Δｒ 径方向隙間
Δａ１ 軸方向隙間
Δａ２ 最小隙間 1 outer ring 2 inner ring 211 inner wall 212 bottom wall 3 rolling element 4 cage 5 seal ring
50 cored bar
51 Elastic body 52 Outer peripheral edge 53 Seal lip part Δr Radial gap Δa1 Axial gap Δa2 Minimum gap

Claims (4)

軸受の内輪と外輪の間を封止し、芯金と弾性体とからなる環状のシール部材を備える転がり軸受であって、
前記弾性体は、前記芯金より径方向に沿って前記芯金の本体部分と同じ方向へ延出する延出部分を有し、
前記内輪は、内輪内径が１０ｍｍ以下であり、内輪外周面の軸線方向両端部に内輪溝部が形成され、
前記外輪は、外輪内周面の軸線方向両端部にシール嵌合溝が形成され、該シール嵌合溝に前記シール部材の外周部が嵌合され、
前記延出部分の内周部の先端に形成されたリップ部が、前記内輪溝部と接触せず、
前記内輪溝部は、前記内輪の軸線方向両端面から軸線方向に沿って、平坦な底壁と、該底壁から凸設された内側壁とが形成され、
前記リップ部は、軸受内部に向かって折り曲げられ、前記内輪の前記底壁及び前記内側壁と対向している部分が断面円弧状となっていることを特徴とする転がり軸受。 Sealing between the inner ring and the outer ring of the bearing, a rolling bearing comprising an annular sealing member ing from a metal core and an elastic body,
The elastic body, have a extended portion extending along said radial direction from the metal core in the same direction as the body portion of the core metal,
The inner ring has an inner ring inner diameter of 10 mm or less, and inner ring groove portions are formed at both axial ends of the outer peripheral surface of the inner ring,
In the outer ring, seal fitting grooves are formed at both axial ends of the inner peripheral surface of the outer ring, and the outer periphery of the seal member is fitted into the seal fitting groove,
The lip portion formed at the tip of the inner peripheral portion of the extending portion does not contact the inner ring groove portion,
The inner ring groove portion is formed with a flat bottom wall and an inner wall projecting from the bottom wall along the axial direction from both axial end surfaces of the inner ring.
The lip portion is bent toward the inside of the bearing , and a portion of the inner ring facing the bottom wall and the inner wall has an arcuate cross section . 前記シール部材のリップ部と前記内側壁との軸方向隙間Δａ１若しくは最小隙間Δａ２が０．１４ｍｍ〜０．２６ｍｍであることを特徴とする請求項１に記載の転がり軸受。 2. The rolling bearing according to claim 1 , wherein an axial gap Δa 1 or a minimum gap Δa 2 between the lip portion of the seal member and the inner wall is 0.14 mm to 0.26 mm. 前記内輪溝部には底壁が形成され、前記シール部材のリップ部と前記内輪との径方向隙間Δｒが０．０５ｍｍ〜０．１５ｍｍであることを特徴とする請求項１又は２に記載の転がり軸受。 The rolling according to claim 1 or 2 , wherein a bottom wall is formed in the inner ring groove, and a radial clearance Δr between the lip portion of the seal member and the inner ring is 0.05 mm to 0.15 mm. bearing. 前記転がり軸受はファンモータ用玉軸受であることを特徴とする請求項１〜３の何れか１項に記載の転がり軸受。 The rolling bearing according to claim 1 , wherein the rolling bearing is a ball bearing for a fan motor.
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US10260561B2 (en) 2017-03-22 2019-04-16 Jtekt Corporation Rolling bearing
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US10174790B2 (en) * 2016-01-26 2019-01-08 Jtekt Corporation Rolling bearing
US10253813B2 (en) 2016-01-26 2019-04-09 Jtekt Corporation Rolling bearing
US10260561B2 (en) 2017-03-22 2019-04-16 Jtekt Corporation Rolling bearing
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US10788075B2 (en) 2017-10-04 2020-09-29 Jtekt Corporation Ball bearing

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