JP3919120B2 - Rolling bearing sealing device - Google Patents

Rolling bearing sealing device Download PDF

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Publication number
JP3919120B2
JP3919120B2 JP2005125044A JP2005125044A JP3919120B2 JP 3919120 B2 JP3919120 B2 JP 3919120B2 JP 2005125044 A JP2005125044 A JP 2005125044A JP 2005125044 A JP2005125044 A JP 2005125044A JP 3919120 B2 JP3919120 B2 JP 3919120B2
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Japan
Prior art keywords
lip
peripheral
rolling bearing
step portion
seal
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JP2005214426A (en
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剛史 奥村
義崇 中川
実弦 若林
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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
    • F16C33/7843—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
    • F16C33/7853—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 one or more sealing lips to contact 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
    • F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
    • F16C33/72—Sealings
    • F16C33/76—Sealings of ball or roller bearings
    • F16C33/80—Labyrinth sealings
    • F16C33/805—Labyrinth sealings in addition to other sealings, e.g. dirt guards to protect sealings with sealing lips
    • 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
    • F16C2300/00—Application independent of particular apparatuses
    • F16C2300/02—General use or purpose, i.e. no use, purpose, special adaptation or modification indicated or a wide variety of uses mentioned

Description

この発明は、転がり軸受の密封装置に関する。   The present invention relates to a rolling bearing sealing device.

従来、転がり軸受の軸受装置としては、例えば実公昭５５−９７１７号公報（特許文献１）のものが知られている。この構造を図４に示す。この従来の転がり軸受の密封装置は、転がり軸受の内輪４０の肩部４１に周段部４２を設け、外輪４３に固着したシール環体４４に上記周段部４２の側面４７に沿って径方向に延びる柔軟な内周シールリップ４５を設けるとともにこの先端部に内側リップ４６を形成し、この内側リップ４６を周段部４２の側面４７に接触させて軸受を密封する構造を有している。   Conventionally, as a bearing device of a rolling bearing, for example, the one disclosed in Japanese Utility Model Publication No. 55-9717 (Patent Document 1) is known. This structure is shown in FIG. In this conventional rolling bearing sealing device, a circumferential step portion 42 is provided on the shoulder portion 41 of the inner ring 40 of the rolling bearing, and the seal ring 44 fixed to the outer ring 43 is radially provided along the side surface 47 of the circumferential step portion 42. The inner lip 46 is formed at the tip of the inner peripheral lip 45 extending in the direction, and the inner lip 46 is brought into contact with the side surface 47 of the peripheral step portion 42 to seal the bearing.

しかしながら、上記の転がり軸受の密封装置においては、内周シールリップ４５の内側リップ４６の周段部側面４７に対するしめしろが、内側リップ４６の寸法ばらつきや内輪変位の関係から過大になった場合、内側リップ４６の摩耗が早期に発生し、内側リップ４６のみの接触ではなく内周シールリップ４５の内側面での面接触となりリップ摺動面圧が低下して軸受外部より軸受内部に水等の異物が侵入する恐れが考えられる。従って、内側リップ４６のしめしろ管理は十分に厳格に行う必要があり、管理工数がかかるという問題がある。
実公昭５５−９７１７号公報 However, in the rolling bearing sealing device described above, when the interference between the inner peripheral seal lip 45 and the inner step lip 46 on the peripheral step portion side surface 47 becomes excessive due to the dimensional variation of the inner lip 46 and the inner ring displacement, Wear of the inner lip 46 occurs at an early stage, and not contact with only the inner lip 46 but surface contact with the inner surface of the inner peripheral seal lip 45, and the lip sliding surface pressure decreases, so that water or the like is introduced into the bearing from the outside of the bearing. There is a possibility that foreign matter may enter. Therefore, it is necessary to manage the interference of the inner lip 46 sufficiently and strictly, and there is a problem that it takes a management man-hour.
Japanese Utility Model Publication No. 55-9717

そこで、この発明の目的は、しめしろ過大によるリップの摩耗が発生しても長期的に密封性を確保できる転がり軸受の密封装置を提供することを目的とする。 SUMMARY OF THE INVENTION An object of the present invention is to provide a rolling bearing sealing device capable of ensuring long-term sealing performance even if lip wear due to large size of squeezing occurs.

上記課題を解決するための手段として、転がり軸受の内輪の肩部に周段部を設け、外輪に固着したシール環体の内周部から上記周段部の側面に沿って径方向に延びる内周シールリップの一部を上記周段部の側面に接触させた転がり軸受の密封装置において、上記シール環体の内周シールリップを、上記周段部の側面方向に延びる複数の内側リップから形成するとともに、上記シール環体の内周部と内側リップ間及び各内側リップ間の各連結部を軸方向斜め外方に互いに平行に延びるように形成し、かつ、上記各内側リップのうち先端内側リップのみが常時上記周段部の側面に接触しながら各連結部が順次軸方向にたわむことができるとともに他の内側リップは先端内側リップの所定量の摩耗後に初めて上記周段部の側面に接触するように形成したことを特徴とする。 As means for solving the above-mentioned problem, a circumferential step portion is provided on the shoulder portion of the inner ring of the rolling bearing, and an inner portion extending radially from the inner peripheral portion of the seal ring fixed to the outer ring along the side surface of the peripheral step portion. In a rolling bearing sealing device in which a part of a peripheral seal lip is brought into contact with a side surface of the peripheral step portion, an inner peripheral seal lip of the seal ring is formed from a plurality of inner lips extending in a side direction of the peripheral step portion. And connecting portions between the inner peripheral portion of the seal ring body and the inner lips and between the inner lips so as to extend parallel to each other in the axially oblique outer direction, and the inner end of the inner lip. Each connecting portion can bend in the axial direction sequentially while only the lip is always in contact with the side surface of the peripheral step portion, and the other inner lip contacts the side surface of the peripheral step portion for the first time after a predetermined amount of wear of the tip inner lip. Formed to Characterized in that was.

また、上記各内側リップのうち、先端内側リップを除く他の内側リップは、当初は上記周段部の側面との間でラビリンス密封部を形成することを特徴とする。 Of the inner lips, the other inner lips except the tip inner lip initially form a labyrinth sealing portion with the side surface of the peripheral step portion .

さらにまた、上記シール環体の内周部から上記周段部の側面とは反対方向に延びる外側リップを形成して、該外側リップは軸受に対する併設部材との間でラビリンス密封部を形成することを特徴とする。 Furthermore, an outer lip extending from the inner peripheral portion of the seal ring body in the direction opposite to the side surface of the peripheral step portion is formed, and the outer lip forms a labyrinth sealing portion with a side member for the bearing. It is characterized by.

この発明は、内周シールリップが複数の基点により内周シールリップ先端部で軸方向のたわみ量を大きくすることが可能となり、内輪の軸方向変位等に起因するしめしろ過大による先端内側リップの磨耗が発生しにくく、また摩耗が発生しても所定量の摩耗後は他の内側リップが周段部の側面に接触して密封性を維持する。   In the present invention, the inner peripheral seal lip can increase the amount of axial deflection at the distal end portion of the inner peripheral seal lip by a plurality of base points, and the inner lip of the distal end inner lip due to the large amount of crimp filtration caused by the axial displacement of the inner ring, etc. Wear does not easily occur, and even if wear occurs, after a predetermined amount of wear, the other inner lip contacts the side surface of the peripheral step portion to maintain the sealing performance.

以下、この発明の具体的実施例について図面を参照して説明する。   Specific embodiments of the present invention will be described below with reference to the drawings.

図１及び図２は、この発明にかかる一実施例である。内輪１と外輪２間には玉３が保持器４を介して転動可能に配置されている．内輪１の肩部５には、軸線に直交するよう径方向に延びる内側の側面７と、軸線に平行な底面８と、内輪１の端面側に向かって径を増大するテーパ面９とからなる断面略Ｊ形状の周段部６を形成している。外輪２の内周面端部には周溝１０を形成しシール環体１１の外周部１１ｂを固着している．このシール環体１１はゴム等の弾性体よりなり、金属性の径方向に延びる芯金２１が埋設されている。このシール環体１１の内周部１１ａには、軸受内方に延びて内輪１の外周面１ａとラビリンス密封部を形成する軸方向リップ１９と、上記周段部６の側面７に沿って径方向に延びる弾性体よりなる柔軟な内周シールリップ１２を形成し、この内周シールリップ１２に形成した後述するリップと周段部６の側面との間で密封を行う。   1 and 2 show an embodiment according to the present invention. A ball 3 is arranged between the inner ring 1 and the outer ring 2 via a cage 4 so as to be able to roll. The shoulder portion 5 of the inner ring 1 includes an inner side surface 7 that extends in the radial direction so as to be orthogonal to the axis, a bottom surface 8 that is parallel to the axis, and a tapered surface 9 that increases in diameter toward the end surface of the inner ring 1. A circumferential step portion 6 having a substantially J-shaped cross section is formed. A circumferential groove 10 is formed at an end portion of the inner peripheral surface of the outer ring 2, and an outer peripheral portion 11 b of the seal ring 11 is fixed. The seal ring 11 is made of an elastic body such as rubber and has a metal core 21 extending in the radial direction. An inner circumferential portion 11 a of the seal ring 11 has an axial lip 19 extending inward of the bearing to form a labyrinth sealing portion with the outer circumferential surface 1 a of the inner ring 1, and a diameter along the side surface 7 of the circumferential step portion 6. A flexible inner peripheral seal lip 12 made of an elastic body extending in the direction is formed, and sealing is performed between a later-described lip formed on the inner peripheral seal lip 12 and a side surface of the peripheral step portion 6.

上記シール環体１１の内周シールリップ１２には、その先端部および中間部にそれぞれ上記周段部６の側面７方向に延びる２個の第１内側リップ１３及び第２内側リップ１４と、この第１内側リップ１３及び第２内側リップ１４のそれぞれの基部から上記周段部６の側面７とは反対方向に延びる２個の第１外側リップ１５及び第２外側リップ１６とを形成している。また、上記シール環体１１の内周部１１ｂと第２内側リップ１４間、及び第２内側リップ１４と第１内側リップ１３間のそれぞれの連結部１７，１８は薄肉とするとともに軸方向斜め外方に延びるように形成している。上記各内側リップのうち先端の第１内側リップ１３のみが常時上記周段部６の側面７に接触して密封するとともに他の第２内側リップ１４は当初は上記周段部６の側面７と非接触とし、第１内側リップ１３の所定量の摩耗後に初めて上記周段部６の側面７に接触するように形成している。   The inner peripheral seal lip 12 of the seal ring 11 has two first inner lips 13 and second inner lips 14 extending in the direction of the side surface 7 of the peripheral step 6 at the tip and intermediate portions, Two first outer lips 15 and second outer lips 16 extending from the respective base portions of the first inner lip 13 and the second inner lip 14 in the direction opposite to the side surface 7 of the circumferential step portion 6 are formed. . In addition, the connecting portions 17 and 18 between the inner peripheral portion 11b of the seal ring body 11 and the second inner lip 14 and between the second inner lip 14 and the first inner lip 13 are made thin and are axially inclined outward. It is formed to extend in the direction. Of the inner lips, only the first inner lip 13 at the tip always contacts and seals the side surface 7 of the peripheral step portion 6 and the other second inner lip 14 is initially connected to the side surface 7 of the peripheral step portion 6. The first inner lip 13 is not contacted and is formed so as to contact the side surface 7 of the circumferential step 6 only after a predetermined amount of wear.

すなわち、第１内側リップ１３の摩耗が進行してリップ摺動面圧が低下してきたときに第２内側リップ１４が周段部６の側面７と接触して密封性を維持するように考慮している。この第２内側リップ１４は断面円弧形状とし周段部６の側面７接触し始めるときの急激なトルク変動につながらないようにしてある。なお、上記第２内側リップ１４は、周段部６の側面７と壊触するまではこの側面７との間でラビリンス密封部を形成して密封性の向上に寄与している。   That is, when the wear of the first inner lip 13 progresses and the lip sliding surface pressure decreases, the second inner lip 14 comes into contact with the side surface 7 of the peripheral step portion 6 to maintain the sealing performance. ing. The second inner lip 14 has an arc shape in cross section so that it does not lead to a sudden torque fluctuation when the side surface 7 of the circumferential step portion 6 starts to contact. The second inner lip 14 forms a labyrinth sealing portion between the side surface 7 and the side surface 7 until it breaks, thereby contributing to an improvement in sealing performance.

また、各リップ間は軸方向斜め外方に傾斜した薄肉の連結部１７，１８にて連結しているため、各リップ１３，１４の寸法ばらつきや内輪１の軸方向変位があった場合、シール環体１１の内周部１１ａと、第２内側リップ１４と第２外側リップ１６間の厚肉部Ａとが基点となって各連結部１７，１８が、順次容易に軸受外側にたわむことができるため、結果的に第１内側リップ１３の軸方向のたわみ量が大きくとれ、内輪１の軸方向変位に対応できる。これは図３の模式図にてよく理解できる。すなわち、内周シールリップ１２は、基点１１ａ，Ａの箇所にて角度θ１，θ２をもってたわむため、第１内側リップ１３の軸方向たわみ量Ｌが容易に大きくとれる。こゝで図３の実線は内周シールリップのもとの位置で、破線はたわみ位置である。 Further, since the lips are connected by thin connecting portions 17 and 18 that are inclined obliquely outward in the axial direction, if there is a variation in the dimensions of the lips 13 and 14 or an axial displacement of the inner ring 1, a seal is provided. The inner peripheral portion 11a of the ring body 11 and the thick portion A between the second inner lip 14 and the second outer lip 16 serve as a starting point so that the connecting portions 17 and 18 can be easily bent to the outside of the bearing sequentially. As a result, the amount of axial deflection of the first inner lip 13 can be increased as a result, and the axial displacement of the inner ring 1 can be accommodated. This can be easily understood from the schematic diagram of FIG. That is, since the inner peripheral seal lip 12 bends at the angles θ 1 and θ2 at the base points 11a and A, the amount of axial deflection L of the first inner lip 13 can be easily increased. Here, the solid line in FIG. 3 is the original position of the inner peripheral seal lip, and the broken line is the deflection position.

従って、第１内側リップ１３の周段部６の側面７に対応するしめしろの適正値の維持が容易に行える。上記各連結部１７，１８は平行に形成することにより、より安定して内輪１の軸方向変位等に対応できるようにしてある。   Accordingly, it is possible to easily maintain an appropriate value of the interference corresponding to the side surface 7 of the circumferential step portion 6 of the first inner lip 13. By forming the connecting portions 17 and 18 in parallel, the connecting portions 17 and 18 can handle the axial displacement of the inner ring 1 more stably.

さらに、第１内側リップ１３の内周面は周段部６のテーパ面９と対向するテーーパ面２０に形成して両テーパ面９，２０間にラビリンス密封部を形成すれば密封性はさらに向上する。   Further, if the inner peripheral surface of the first inner lip 13 is formed on the taper surface 20 facing the tapered surface 9 of the peripheral step portion 6 and a labyrinth sealing portion is formed between the tapered surfaces 9, 20, the sealing performance is further improved. To do.

また、上記第１及び第２外側リップ１５，１６と、内輪１に併設した軸２２に圧入固定したスリンガ２０等の部材が配置される場合には、その部材２０と各外側リップ１５，１６との間にラビリンス密封部を形成すれば、より密封効果が上がる。 When the first and second outer lips 15 and 16 and members such as the slinger 20 press-fitted and fixed to the shaft 22 provided along with the inner ring 1 are disposed, the member 20 and the outer lips 15 and 16 If a labyrinth sealing part is formed between the two, the sealing effect is further increased.

なお、上記内周シールリップ１２の内側リップ１３，１４及び外側リップ１５，１６は２個ずつに限定する必要はなく、複数あればよい。   The inner lip 13 and 14 and the outer lips 15 and 16 of the inner peripheral seal lip 12 do not have to be limited to two, but may be plural.

この発明にかかる一実施例である転がり軸受の密封装置の要部縦断面図であるIt is a principal part longitudinal cross-sectional view of the sealing device of the rolling bearing which is one Example concerning this invention. 図１の要部拡大図である。It is a principal part enlarged view of FIG. 図１の内周シールリップのたわみ模式図である。It is a deflection | deviation schematic diagram of the inner peripheral seal lip of FIG. 従来の転がり軸受の密封装置の縦断面図である。It is a longitudinal cross-sectional view of the sealing device of the conventional rolling bearing.

符号の説明Explanation of symbols

１ 内輪
２ 外輪
６ 周段部
７ 側面
１１ シール環体
１２ 内周シールリップ
１３ 第１内側リップ
１４ 第２内側リップ
１５ 第１外側リップ
１６ 第２外側リップ
１７ 連結部
１８ 連結部 DESCRIPTION OF SYMBOLS 1 Inner ring 2 Outer ring 6 Circumferential step part 7 Side surface 11 Seal ring 12 Inner peripheral seal lip 13 1st inner lip 14 2nd inner lip 15 1st outer lip 16 2nd outer lip 17 Connection part 18 Connection part

Claims (3)

転がり軸受の内輪の肩部に周段部を設け、外輪に固着したシール環体の内周部から上記周段部の側面に沿って径方向に延びる内周シールリップの一部を上記周段部の側面に接触させた転がり軸受の密封装置において、上記シール環体の内周シールリップを、上記周段部の側面方向に延びる複数の内側リップから形成するとともに、上記シール環体の内周部と内側リップ間及び各内側リップ間の各連結部を軸方向斜め外方に互いに平行に延びるように形成し、かつ、上記各内側リップのうち先端内側リップのみが常時上記周段部の側面に接触しながら各連結部が順次軸方向にたわむことができるとともに他の内側リップは先端内側リップの所定量の摩耗後に初めて上記周段部の側面に接触するように形成したことを特徴とする転がり軸受の密封装置。   A peripheral step is provided on the shoulder of the inner ring of the rolling bearing, and a part of the inner peripheral seal lip extending in the radial direction along the side surface of the peripheral step is provided from the inner peripheral part of the seal ring fixed to the outer ring. In the rolling bearing sealing device brought into contact with the side surface of the part, the inner peripheral seal lip of the seal ring is formed from a plurality of inner lips extending in the side direction of the peripheral step part, and the inner periphery of the seal ring The connecting portions between the inner lip and the inner lip are formed so as to extend parallel to each other obliquely outward in the axial direction, and only the tip inner lip of the inner lips is always the side surface of the circumferential step portion. Each of the connecting portions can be sequentially bent in the axial direction while being in contact with each other, and the other inner lip is formed so as to contact the side surface of the circumferential step portion only after a predetermined amount of wear of the inner tip lip. Rolling bearing sealing Location. 上記各内側リップのうち、先端内側リップを除く他の内側リップは、当初は上記周段部の側面との間でラビリンス密封部を形成することを特徴とする請求項１に記載の転がり軸受の密封装置。   2. The rolling bearing according to claim 1, wherein among the inner lips, the other inner lips other than the tip inner lip initially form a labyrinth sealing portion with a side surface of the circumferential step portion. Sealing device. 上記シール環体の内周部から上記周段部の側面とは反対方向に延びる外側リップを形成して、該外側リップは軸受に対する併設部材との間でラビリンス密封部を形成することを特徴とする請求項１または２に記載の転がり軸受の密封装置。 The side surface of the circumferential step portion from the inner periphery of the seal ring body to form an outer lip extending in the opposite direction, the outer lip and wherein forming a labyrinth seal between the hotel member with respect to the bearing The rolling bearing sealing device according to claim 1 or 2.
JP2005125044A 2005-04-22 2005-04-22 Rolling bearing sealing device Expired - Fee Related JP3919120B2 (en)

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JP2005125044A JP3919120B2 (en) 2005-04-22 2005-04-22 Rolling bearing sealing device

Related Parent Applications (1)

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JP19529896A Division JP3740219B2 (en) 1996-07-05 1996-07-05 Rolling bearing sealing device

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JP2007005847A Division JP4428719B2 (en) 2007-01-15 2007-01-15 Rolling bearing sealing device

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JP2005214426A JP2005214426A (en) 2005-08-11
JP3919120B2 true JP3919120B2 (en) 2007-05-23

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