JP2008082351A - Sealing device - Google Patents

Sealing device Download PDF

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Publication number
JP2008082351A
JP2008082351A JP2006259691A JP2006259691A JP2008082351A JP 2008082351 A JP2008082351 A JP 2008082351A JP 2006259691 A JP2006259691 A JP 2006259691A JP 2006259691 A JP2006259691 A JP 2006259691A JP 2008082351 A JP2008082351 A JP 2008082351A
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Prior art keywords
ring
sealing device
fixed
outer ring
lip
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JP2006259691A
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Japanese (ja)
Inventor
Choshin Kan
長シン 干
Yoichi Tsuzaki
洋一 津崎
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JTEKT Corp
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JTEKT Corp
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Priority to JP2006259691A priority Critical patent/JP2008082351A/en
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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
    • F16C33/7869—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members mounted with a cylindrical portion to the inner surface of the outer race and having a radial portion extending inward
    • F16C33/7879—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members mounted with a cylindrical portion to the inner surface of the outer race and having a radial portion extending inward with a further sealing ring
    • 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
    • F16C19/14—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for both radial and axial load
    • F16C19/18—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for both radial and axial load with two or more rows of balls
    • F16C19/181—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for both radial and axial load with two or more rows of balls with angular contact
    • F16C19/183—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for both radial and axial load with two or more rows of balls with angular contact with two rows at opposite angles
    • F16C19/184—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for both radial and axial load with two or more rows of balls with angular contact with two rows at opposite angles in O-arrangement
    • F16C19/185—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for both radial and axial load with two or more rows of balls with angular contact with two rows at opposite angles in O-arrangement with two raceways provided integrally on a part other than a race ring, e.g. a shaft or housing
    • 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
    • F16C2326/00—Articles relating to transporting
    • F16C2326/01—Parts of vehicles in general
    • F16C2326/02—Wheel hubs or castors

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Sealing With Elastic Sealing Lips (AREA)
  • Sealing Of Bearings (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To provide a sealing device capable of improving sealing performance in a rolling bearing wherein an outer ring is fixed to a rotating member. <P>SOLUTION: The sealing device 50 is composed of a slinger 51, a core bar 52, a first seal ring 53, and a second seal ring 54. The slinger 51 is provided with a first cylindrical part 51a, and a first flange part 51b extending toward an inner ring 20 side, and the first cylindrical part 51a is fixed to an inner circumference face of an outer ring 30. The core bar 52 is provided with a second cylindrical part 52a, and a second flange part 52b extending toward an outer ring 30 side, and a second cylindrical part 52a is fixed to an outer circumference face of the inner ring 20. The first seal ring 53 is attached to the slinger 51, and the second seal ring 54 is attached to the core bar 52. The first seal ring 53 has an axial lip 53a sliding on the second flange part 52b in a state with a tip facing an inner ring side, and the second seal ring 54 has a radial lip 54a sliding on the first cylindrical part 51a. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

本発明は、転がり軸受における、外輪の内周面と内輪の外周面とにより形成される空間の軸方向端部の開口を密封する密封装置に関する。   The present invention relates to a sealing device for sealing an opening at an axial end portion of a space formed by an inner peripheral surface of an outer ring and an outer peripheral surface of an inner ring in a rolling bearing.

一般に、外輪と内輪とを備えた転がり軸受においては、転がり軸受の内部に泥水等の異物が侵入すること、及び転がり軸受の内部に封入した潤滑グリースが外部に飛散することを防止するための密封装置が設けられている。こうした密封装置としては、特許文献１に示されるように、外輪の内周面と内輪の外周面とにより形成される空間の軸方向端部の開口を密封するようにしたものが広く知られている。   In general, in a rolling bearing having an outer ring and an inner ring, sealing is performed to prevent foreign matter such as muddy water from entering the rolling bearing and scattering of the lubricating grease enclosed in the rolling bearing to the outside. A device is provided. As such a sealing device, as shown in Patent Document 1, a device that seals the opening at the axial end of the space formed by the inner peripheral surface of the outer ring and the outer peripheral surface of the inner ring is widely known. Yes.

図３は、特許文献１に示される密封装置を示したものである。この密封装置１３０は、スリンガ１３１と芯金１３２とシールリング１３３とから構成される。スリンガ１３１は、内輪１１０の外周面に固定される円筒部１３１ａと、軸方向外側（内輪１１０と外輪１２０とにより形成される空間が開口する側）端部において外輪１２０側へ延びる環状板部１３１ｂとを備えている。芯金１３２は、スリンガ１３１に対向する外輪１２０の内周面に固定される円筒部１３２ａと、軸方向内側（軸方向外側の反対側）端部において内輪１１０側へ延びる環状板部１３２ｂとを備えている。シールリング１３３は、ラジアルリップ１３３ａとアキシャルリップ１３３ｂとが形成された弾性ゴムからなり、芯金１３２に対して加硫接着されている。そして、ラジアルリップ１３３ａは、所定の締め代をもってスリンガ１３１の円筒部１３１ａと当接するように配置される。一方、アキシャルリップ１３３ｂは、所定の締め代をもってスリンガ１３１の環状板部１３１ｂと当接し、その先端が外輪１２０側を向くように配置される。これにより、ラジアルリップ１３３ａ及びアキシャルリップ１３３ｂは、内輪１１０と外輪１２０との相対回転時に、スリンガ１３１に対する密封性を確保しながら摺接する。このように、上記の密封装置１３０では、ラジアルリップ１３３ａ及びアキシャルリップ１３３ｂの摺接によって、転がり軸受内部への異物の浸入、及び転がり軸受外部への潤滑グリースの飛散を抑えるようにしている。ここで、本明細書において軸方向とは図の左右方向である。
特開２００２−２５０４４９号公報 FIG. 3 shows a sealing device shown in Patent Document 1. As shown in FIG. The sealing device 130 includes a slinger 131, a core bar 132, and a seal ring 133. The slinger 131 includes a cylindrical portion 131a that is fixed to the outer peripheral surface of the inner ring 110, and an annular plate portion 131b that extends toward the outer ring 120 at the axially outer end (the side where the space formed by the inner ring 110 and the outer ring 120 opens). And. The cored bar 132 includes a cylindrical portion 132a that is fixed to the inner peripheral surface of the outer ring 120 that faces the slinger 131, and an annular plate portion 132b that extends toward the inner ring 110 at the axially inner side (opposite side in the axial direction) end. I have. The seal ring 133 is made of an elastic rubber having a radial lip 133a and an axial lip 133b, and is vulcanized and bonded to the core metal 132. And the radial lip 133a is arrange | positioned so that it may contact | abut with the cylindrical part 131a of the slinger 131 with a predetermined interference. On the other hand, the axial lip 133b is disposed so as to abut the annular plate portion 131b of the slinger 131 with a predetermined tightening margin and the tip thereof faces the outer ring 120 side. As a result, the radial lip 133a and the axial lip 133b are in sliding contact with each other while ensuring the sealing performance against the slinger 131 when the inner ring 110 and the outer ring 120 are rotated relative to each other. As described above, in the sealing device 130 described above, the sliding of the radial lip 133a and the axial lip 133b prevents the entry of foreign matter into the rolling bearing and the scattering of the lubricating grease to the outside of the rolling bearing. Here, in this specification, the axial direction is the horizontal direction in the figure.
JP 2002-250449 A

ところで、上記のような密封装置を、外輪が回転部材に固定される転がり軸受に適用した場合、外輪が回転部材に固定されると、外輪の回転によって外輪に取付けられている芯金が回転するため、芯金に接着されたシールリングに対して遠心力が加わることになる。このとき、シールリングのラジアルリップには、スリンガの円筒部とは逆の方向に遠心力が加わるので、ラジアルリップとスリンガの円筒部との締め代が減少する可能性がある。さらに、シールリングのアキシャルリップにも外輪側への遠心力が加わるため、先端が外輪側を向いているアキシャルリップとスリンガの環状板部との締め代も減少する可能性がある。このため、ラジアルリップ及びアキシャルリップの摺接による密封性の確保が困難となるおそれがある。   By the way, when the sealing device as described above is applied to a rolling bearing in which the outer ring is fixed to the rotating member, when the outer ring is fixed to the rotating member, the core metal attached to the outer ring is rotated by the rotation of the outer ring. Therefore, a centrifugal force is applied to the seal ring bonded to the core metal. At this time, since the centrifugal force is applied to the radial lip of the seal ring in the direction opposite to the cylindrical portion of the slinger, the interference between the radial lip and the cylindrical portion of the slinger may be reduced. Further, since centrifugal force to the outer ring side is also applied to the axial lip of the seal ring, there is a possibility that the tightening margin between the axial lip whose tip is directed to the outer ring side and the annular plate portion of the slinger is reduced. For this reason, there exists a possibility that securing of the sealing performance by the sliding contact of a radial lip and an axial lip may become difficult.

本発明は、外輪が回転部材に固定される転がり軸受において、密封性を向上することができる密封装置を提供することにある。   An object of the present invention is to provide a sealing device capable of improving sealing performance in a rolling bearing in which an outer ring is fixed to a rotating member.

請求項１に記載の発明は、回転部材に固定される外輪と静止部材に固定される内輪とを備える転がり軸受に適用され、外輪の内周面と内輪の外周面とにより形成される空間の軸方向端部の開口を密封する密封装置において、スリンガと芯金と第１シールリングと第２シールリングとを備えるものである。スリンガは外輪の内周面に固定される第１円筒部と、第１円筒部の軸方向外側端部から内輪側へ延びる第１フランジ部とを備える。芯金は第１円筒部と対向する内輪の外周面に固定される第２円筒部と、第２円筒部の軸方向内側端部から外輪側へ延びる第２フランジ部とを備える。また、第１シールリングは、スリンガに固着され、先端が内輪側へ向いた状態で第２フランジ部に摺接するアキシャルリップを有する。一方、第２シールリングは芯金に固着され、第１円筒部に摺接するラジアルリップを有する。   The invention according to claim 1 is applied to a rolling bearing including an outer ring fixed to the rotating member and an inner ring fixed to the stationary member, and a space formed by the inner peripheral surface of the outer ring and the outer peripheral surface of the inner ring. A sealing device that seals an opening at an axial end portion includes a slinger, a cored bar, a first seal ring, and a second seal ring. The slinger includes a first cylindrical portion fixed to the inner peripheral surface of the outer ring, and a first flange portion extending from the axially outer end of the first cylindrical portion toward the inner ring. The metal core includes a second cylindrical portion fixed to the outer peripheral surface of the inner ring facing the first cylindrical portion, and a second flange portion extending from the axially inner end of the second cylindrical portion toward the outer ring. The first seal ring has an axial lip that is fixed to the slinger and slidably contacts the second flange portion in a state in which the tip is directed to the inner ring side. On the other hand, the second seal ring is fixed to the core metal and has a radial lip that is in sliding contact with the first cylindrical portion.

同構成の特徴を備えた密封装置によれば、転がり軸受の外輪の回転によって、外輪に対して取付けられている第１シールリングのアキシャルリップには、外輪側への遠心力が加わるため、先端が内輪側を向いているアキシャルリップは、より一層第２フランジ部側に付勢され、アキシャルリップと第２フランジ部との締め代が増加する。一方、回転しない内輪に対して取付けられている第２シールリングのラジアルリップには、遠心力が加わらないため、ラジアルリップとスリンガの第１円筒部との締め代は変化しない。このため、第１シールリングに加わる遠心力によって、アキシャルリップの密封性を向上させることができるとともに、第２シールリングに遠心力が加わらないようにして、ラジアルリップの密封性に対する悪影響を排除することができる。従って、遠心力により各リップの密封性が低下してしまうことを抑えることができる。   According to the sealing device having the characteristics of the same configuration, the centrifugal force to the outer ring side is applied to the axial lip of the first seal ring attached to the outer ring by the rotation of the outer ring of the rolling bearing. The axial lip facing toward the inner ring is further urged toward the second flange portion, and the tightening margin between the axial lip and the second flange portion increases. On the other hand, since the centrifugal force is not applied to the radial lip of the second seal ring attached to the non-rotating inner ring, the interference between the radial lip and the first cylindrical portion of the slinger does not change. For this reason, the sealing force of the axial lip can be improved by the centrifugal force applied to the first seal ring, and the adverse effect on the sealing property of the radial lip is eliminated by preventing the centrifugal force from being applied to the second seal ring. be able to. Therefore, it can suppress that the sealing performance of each lip falls by centrifugal force.

請求項２に記載の発明は、請求項１に記載の密封装置において、アキシャルリップは、第１フランジ部の内周先端から、略直線状に延びて第２フランジ部に摺接していることを特徴とする。   According to a second aspect of the present invention, in the sealing device according to the first aspect, the axial lip extends substantially linearly from the inner peripheral tip of the first flange portion and is in sliding contact with the second flange portion. Features.

同構成によれば、アキシャルリップは、第１フランジ部の内周先端と第２フランジ部とを略直線状に繋ぐように配置される。このため、第１フランジ部の内周先端と第２円筒部とによって形成される開口部から侵入する異物は、回転するアキシャルリップに弾かれて、開口部の外側へ排出され易くなる。従って、転がり軸受内部への異物の混入を好適に抑制することができる。   According to this configuration, the axial lip is disposed so as to connect the inner peripheral tip of the first flange portion and the second flange portion in a substantially straight line. For this reason, the foreign matter which invades from the opening formed by the inner peripheral tip of the first flange portion and the second cylindrical portion is easily repelled by the rotating axial lip and discharged to the outside of the opening. Therefore, it is possible to suitably suppress the entry of foreign matter into the rolling bearing.

本発明によれば、外輪の回転による遠心力によって、アキシャルリップ及びラジアルリップの密封性が低下してしまうことを抑えることができる。   According to this invention, it can suppress that the sealing performance of an axial lip and a radial lip falls by the centrifugal force by rotation of an outer ring | wheel.

以下、図１〜２を参照して、本発明に係る密封装置を車輪用転がり軸受に搭載した一実施形態について説明する。図１は、車輪用転がり軸受の構造を示す一部断面図である。
車輪用転がり軸受は、図１に示すように、固定部材としての車軸１０に取り付けられる一対の内輪２０と、回転部材としての車輪に取り付けられる外輪３０と、転動体としての玉４０と、密封装置５０とを備える。 Hereinafter, with reference to FIGS. 1-2, one Embodiment which mounted the sealing device based on this invention in the rolling bearing for wheels is described. FIG. 1 is a partial cross-sectional view showing the structure of a wheel rolling bearing.
As shown in FIG. 1, the wheel rolling bearing includes a pair of inner rings 20 attached to an axle 10 as a fixed member, an outer ring 30 attached to a wheel as a rotating member, a ball 40 as a rolling element, and a sealing device. 50.

内輪２０は、中心に貫通孔を有して環状に形成され、その貫通孔には車両に固定された車軸１０の小径部１１が挿通されている。一対の内輪２０は、車軸１０の先端に設けられるねじ部１３にナット１４が螺合されることにより、ナット１４と大径部１２の軸方向端部とで狭持され、車軸１０に対して固定される。また、内輪２０の外周には、複列の玉４０が転動する転動面２１が形成されている。   The inner ring 20 is formed in an annular shape with a through hole at the center, and the small diameter portion 11 of the axle 10 fixed to the vehicle is inserted through the through hole. The pair of inner rings 20 is held between the nut 14 and the axial end portion of the large diameter portion 12 by screwing the nut 14 into the screw portion 13 provided at the tip of the axle 10, so that the Fixed. A rolling surface 21 on which the double row balls 40 roll is formed on the outer periphery of the inner ring 20.

外輪３０は、内輪２０の外周よりも大きい内周を有するように環状に形成されている。外輪３０の外周面にはフランジ部３１が形成されており、このフランジ部３１に図示しない車輪がボルト３２を介して固定される。また、外輪３０の内周には、複列の玉４０が転動する転動面３３が形成されている。   The outer ring 30 is formed in an annular shape so as to have an inner circumference larger than the outer circumference of the inner ring 20. A flange portion 31 is formed on the outer peripheral surface of the outer ring 30, and a wheel (not shown) is fixed to the flange portion 31 via a bolt 32. A rolling surface 33 on which the double row balls 40 roll is formed on the inner circumference of the outer ring 30.

玉４０は、内輪２０の転動面２１と外輪３０の転動面３３とに対応する位置に周方向に沿って２列配置されている。
密封装置５０は、内輪２０の外周面と外輪３０の内周面とにより形成される空間を密封するように軸方向両端部の開口に配置されている。密封装置５０は、泥水等が内輪２０と外輪３０との隙間から車輪用転がり軸受の内部に侵入することを抑制するとともに、車輪用転がり軸受の内部に封入された潤滑グリースが外部に飛散することを抑制している。 The balls 40 are arranged in two rows along the circumferential direction at positions corresponding to the rolling surface 21 of the inner ring 20 and the rolling surface 33 of the outer ring 30.
The sealing device 50 is disposed in the openings at both ends in the axial direction so as to seal a space formed by the outer peripheral surface of the inner ring 20 and the inner peripheral surface of the outer ring 30. The sealing device 50 prevents muddy water and the like from entering the inside of the wheel rolling bearing through the gap between the inner ring 20 and the outer ring 30 and also causes the lubricating grease enclosed in the wheel rolling bearing to scatter to the outside. Is suppressed.

図２は、図１の平面右上の密封装置５０を拡大した断面図である。密封装置５０は、スリンガ５１と芯金５２と第１シールリング５３と第２シールリング５４とを備えるものである。スリンガ５１は第１円筒部５１ａと、第１円筒部５１ａの軸方向外側（すなわち、車輪用転がり軸受の内部側の反対側）端部から内輪２０側へ延びる第１フランジ部５１ｂとを備え、外輪３０の内周面に第１円筒部５１ａが固定されている。芯金５２は第２円筒部５２ａと、第２円筒部５２ａの軸方向内側（すなわち、車輪用転がり軸受の内部側）端部から外輪３０側へ延びる第２フランジ部５２ｂとを備え、第１円筒部５１ａと対向する内輪２０の外周面に第２円筒部５２ａが固定されている。スリンガ５１には第１シールリング５３が固着されるとともに、芯金５２には第２シールリング５４が固着されている。   FIG. 2 is an enlarged cross-sectional view of the sealing device 50 at the upper right of the plane of FIG. The sealing device 50 includes a slinger 51, a cored bar 52, a first seal ring 53, and a second seal ring 54. The slinger 51 includes a first cylindrical portion 51a, and a first flange portion 51b extending from the axially outer end of the first cylindrical portion 51a (that is, the opposite side to the inner side of the wheel rolling bearing) to the inner ring 20 side. A first cylindrical portion 51 a is fixed to the inner peripheral surface of the outer ring 30. The cored bar 52 includes a second cylindrical portion 52a and a second flange portion 52b extending from the axially inner end of the second cylindrical portion 52a (that is, the inner side of the wheel rolling bearing) to the outer ring 30 side. A second cylindrical portion 52a is fixed to the outer peripheral surface of the inner ring 20 facing the cylindrical portion 51a. A first seal ring 53 is fixed to the slinger 51, and a second seal ring 54 is fixed to the cored bar 52.

第１シールリング５３は弾性部材から形成されており、先端５３ｂが内輪側へ向いた状態で第２フランジ部５２ｂに摺接するアキシャルリップ５３ａを有している。このアキシャルリップ５３ａは、第１フランジ部５１ｂの内周先端から略直線状に延びて、第２フランジ部５２ｂに摺接している。すなわち、アキシャルリップ５３ａは、その内側面５３ｃが第２フランジ部５２ｂとの間で所定の締め代をもって当接するように配置されている。   The first seal ring 53 is formed of an elastic member, and has an axial lip 53a that is in sliding contact with the second flange portion 52b with the tip 53b facing the inner ring. The axial lip 53a extends substantially linearly from the inner peripheral tip of the first flange portion 51b and is in sliding contact with the second flange portion 52b. In other words, the axial lip 53a is disposed such that the inner side surface 53c abuts with the second flange portion 52b with a predetermined tightening margin.

一方、第２シールリング５４は弾性部材から形成されており、第１円筒部５１ａに摺接するラジアルリップ５４ａを有している。このラジアルリップ５４ａは二股状に形成されており、主リップ５４ｂと補助リップ５４ｃとを有し、第１円筒部５１ａに摺接している。すなわち、主リップ５４ｂと補助リップ５４ｃとは、それらの先端が第１円筒部５１ａとの間で所定の締め代をもって当接するように配置されている。   On the other hand, the second seal ring 54 is formed of an elastic member and has a radial lip 54a that is in sliding contact with the first cylindrical portion 51a. The radial lip 54a is formed in a bifurcated shape, has a main lip 54b and an auxiliary lip 54c, and is in sliding contact with the first cylindrical portion 51a. That is, the main lip 54b and the auxiliary lip 54c are arranged so that their tips abut against the first cylindrical portion 51a with a predetermined tightening margin.

次に、車輪用転がり軸受の外輪３０が回転した場合における密封装置５０の作用について説明する。
車両の走行に伴って車輪が回転すると、外輪３０が車軸１０を中心に回転する。従って、スリンガ５１及び第１シールリング５３は外輪３０と一体的に回転し、アキシャルリップ５３ａには外輪３０側への遠心力が加わる。このため、先端５３ｂが内輪２０側を向いているアキシャルリップ５３ａの内側面５３ｃは、より一層第２フランジ部５２ｂに付勢される。この結果、締め代が増加し、アキシャルリップ５３ａと第２フランジ部５２ｂとの間の密封性が向上する。 Next, the operation of the sealing device 50 when the outer ring 30 of the wheel rolling bearing is rotated will be described.
When the wheel rotates as the vehicle travels, the outer ring 30 rotates around the axle 10. Accordingly, the slinger 51 and the first seal ring 53 rotate integrally with the outer ring 30, and a centrifugal force toward the outer ring 30 is applied to the axial lip 53a. For this reason, the inner side surface 53c of the axial lip 53a with the tip 53b facing the inner ring 20 is further urged by the second flange portion 52b. As a result, the tightening margin increases, and the sealing performance between the axial lip 53a and the second flange portion 52b is improved.

また、アキシャルリップ５３ａは、第１フランジ部５１ｂの内周先端から内輪２０側へ斜め方向に略直線状に延びて配置されている。このように構成されているため、第１フランジ部５１ｂの内周先端と第２円筒部５２ａとによって形成される開口部から侵入する泥水等の異物は、回転するアキシャルリップ５３ａに弾かれて外部へ排出される。   Further, the axial lip 53a is disposed so as to extend in a substantially straight line in an oblique direction from the inner peripheral tip of the first flange portion 51b to the inner ring 20 side. Due to such a configuration, foreign matter such as muddy water entering from the opening formed by the inner peripheral tip of the first flange portion 51b and the second cylindrical portion 52a is bounced by the rotating axial lip 53a and externally. Is discharged.

一方、内輪２０は車軸１０に対して固定されているため、外輪の回転によっても、芯金５２と第２シールリング５４とに遠心力が加わらない。従って、ラジアルリップ５４ａには遠心力が加わらないため、ラジアルリップ５４ａと第１円筒部５１ａとの締め代が維持される。   On the other hand, since the inner ring 20 is fixed to the axle 10, no centrifugal force is applied to the cored bar 52 and the second seal ring 54 even when the outer ring rotates. Therefore, since centrifugal force is not applied to the radial lip 54a, the tightening margin between the radial lip 54a and the first cylindrical portion 51a is maintained.

このようにして、密封装置５０は外輪３０の回転に起因する遠心力により、アキシャルリップ５３ａと第２フランジ部５２ｂとの締め代、及びラジアルリップ５４ａと第１円筒部５１ａとの締め代が減少することを抑制し、各リップによる密封性の低下を抑えている。   In this way, the sealing device 50 reduces the tightening allowance between the axial lip 53a and the second flange portion 52b and the tightening allowance between the radial lip 54a and the first cylindrical portion 51a due to the centrifugal force caused by the rotation of the outer ring 30. This prevents the deterioration of the sealing performance caused by each lip.

上記実施形態の密封装置によれば、以下のような効果を得ることができる。
（１）上記実施形態では、外輪３０の回転によって、第１シールリング５３のアキシャルリップ５３ａには、外輪３０側への遠心力が加わるため、先端５３ｂが内輪２０側を向いているアキシャルリップ５３ａは、より一層第２フランジ部５２ｂ側に付勢され、アキシャルリップ５３ａと第２フランジ部５２ｂとの締め代が増加する。従って、遠心力によってアキシャルリップ５３ａの密封性を向上させることができ、遠心力によってアキシャルリップ５３ａの密封性が低下してしまうことを抑えることができる。 According to the sealing device of the above embodiment, the following effects can be obtained.
(1) In the above embodiment, since the centrifugal force toward the outer ring 30 is applied to the axial lip 53a of the first seal ring 53 by the rotation of the outer ring 30, the axial lip 53a in which the tip 53b faces the inner ring 20 side. Is further biased toward the second flange portion 52b, and the tightening allowance between the axial lip 53a and the second flange portion 52b increases. Therefore, the sealing performance of the axial lip 53a can be improved by the centrifugal force, and the sealing performance of the axial lip 53a can be prevented from being lowered by the centrifugal force.

（２）上記実施形態では、第２シールリング５４のラジアルリップ５４ａには遠心力が加わらないため、ラジアルリップ５４ａと第１円筒部５１ａとの締め代が変化しない。従って、ラジアルリップ５４ａの密封性に対する遠心力の悪影響を排除することができ、遠心力によってラジアルリップ５４ａの密封性が低下してしまうことを抑えることができる。   (2) In the above embodiment, since centrifugal force is not applied to the radial lip 54a of the second seal ring 54, the tightening allowance between the radial lip 54a and the first cylindrical portion 51a does not change. Therefore, the adverse effect of the centrifugal force on the sealing performance of the radial lip 54a can be eliminated, and the sealing performance of the radial lip 54a can be prevented from being lowered by the centrifugal force.

（３）上記実施形態では、アキシャルリップ５３ａは第１フランジ部５１ｂの内周先端と第２フランジ部５２ｂとを略直線状に繋ぐように配置されているため、第１フランジ部５１ｂの内周先端と第２円筒部５２ａとによって形成される開口部から進入する異物が回転するアキシャルリップ５３ａに弾かれて、開口部の外側へ排出され易くなる。従って、車輪用転がり軸受内部への異物の侵入を好適に抑制することができる。   (3) In the above embodiment, the axial lip 53a is disposed so as to connect the inner peripheral tip of the first flange portion 51b and the second flange portion 52b in a substantially straight line, and therefore the inner periphery of the first flange portion 51b. Foreign matter entering from the opening formed by the tip and the second cylindrical portion 52a is bounced by the rotating axial lip 53a and is easily discharged to the outside of the opening. Accordingly, it is possible to suitably suppress the entry of foreign matter into the wheel rolling bearing.

なお、上記実施形態は以下のように変更してもよい。
・上記実施形態では、玉４０が周方向に沿って２列配置された複列の車輪用転がり軸受に本発明を適用しているが、玉４０が単列の車輪用転がり軸受に本発明を適用してもよい。 In addition, you may change the said embodiment as follows.
In the above embodiment, the present invention is applied to a double row wheel rolling bearing in which the balls 40 are arranged in two rows along the circumferential direction. However, the present invention is applied to a wheel rolling bearing in which the balls 40 are a single row. You may apply.

・上記実施形態では、転動体として玉４０を用いたが、円筒状のころを用いてもよい。
・上記実施形態では、密封装置５０を車輪用転がり軸受に適用したが、外輪が回転する転がり軸受であれば車輪用以外の転がり軸受に適用してもよい。 -In above-mentioned embodiment, although the ball | bowl 40 was used as a rolling element, you may use a cylindrical roller.
In the above embodiment, the sealing device 50 is applied to the wheel rolling bearing. However, the sealing device 50 may be applied to a rolling bearing other than the wheel as long as the outer ring rotates.

・上記実施形態では、外輪３０に車輪を固定するフランジ部３１を一体的に形成していたが、フランジ部を有する環状のハウジングを別個に設けて、このハウジングの内周に外輪を固定するようにしてもよい。   In the above embodiment, the flange portion 31 for fixing the wheel to the outer ring 30 is integrally formed. However, an annular housing having a flange portion is separately provided, and the outer ring is fixed to the inner periphery of the housing. It may be.

・上記実施形態では、ラジアルリップ５４ａは二股状に形成され、主リップ５４ｂと補助リップ５４ｃとを有し、第１円筒部５１ａに摺接しているが、二股状に形成せずに第１円筒部５１ａと摺接させてもよい。   In the above embodiment, the radial lip 54a is formed in a bifurcated shape, has a main lip 54b and an auxiliary lip 54c, and is in sliding contact with the first cylindrical portion 51a. You may make it slidably contact with the part 51a.

・上記実施形態では、アキシャルリップ５３ａは第１フランジ部５１ｂの内周先端から第２フランジ部５２ｂへ略直線状に延びて摺接しているが、第１フランジ部５１ｂの内周先端ではない部分から第２フランジ部５２ｂへ延びて摺接するようにしてもよい。   In the above embodiment, the axial lip 53a extends substantially linearly from the inner peripheral tip of the first flange portion 51b to the second flange portion 52b and is in sliding contact, but is not the inner peripheral tip of the first flange portion 51b. The second flange portion 52b may be slidably contacted with the second flange portion 52b.

本発明の密封装置を用いた車輪用転がり軸受を示す一部断面図である。It is a partial cross section figure which shows the rolling bearing for wheels using the sealing device of this invention. 本発明の密封装置を示す断面図である。It is sectional drawing which shows the sealing device of this invention. 従来の密封装置を示す断面図である。It is sectional drawing which shows the conventional sealing device.

符号の説明Explanation of symbols

１０…固定部材としての車軸、２０…内輪、３０…外輪、４０…転動体としての玉、５０…密封装置、５１…スリンガ、５１ａ…第１円筒部、５１ｂ…第１フランジ部、５２…芯金、５２ａ…第２円筒部、５２ｂ…第２フランジ部、５３…第１シールリング、５３ａ…アキシャルリップ、５３ｂ…先端、５４…第２シールリング、５４ａ…ラジアルリップ。 DESCRIPTION OF SYMBOLS 10 ... Axle as fixing member, 20 ... Inner ring, 30 ... Outer ring, 40 ... Ball as rolling element, 50 ... Sealing device, 51 ... Slinger, 51a ... First cylindrical part, 51b ... First flange part, 52 ... Core Gold, 52a ... 2nd cylindrical part, 52b ... 2nd flange part, 53 ... 1st seal ring, 53a ... Axial lip, 53b ... Tip, 54 ... 2nd seal ring, 54a ... Radial lip.

Claims (2)

回転部材に固定される外輪と静止部材に固定される内輪とを備える転がり軸受に適用され、外輪の内周面と内輪の外周面とにより形成される空間の軸方向端部の開口を密封する密封装置において、
外輪の内周面に固定される第１円筒部と、第１円筒部の軸方向外側端部から内輪側へ延びる第１フランジ部とを備えたスリンガと、
前記第１円筒部と対向する内輪の外周面に固定される第２円筒部と、第２円筒部の軸方向内側端部から外輪側へ延びる第２フランジ部とを備えた芯金と、
前記スリンガに固着され、先端が内輪側へ向いた状態で前記第２フランジ部に摺接するアキシャルリップを有する第１シールリングと、
前記芯金に固着され、前記第１円筒部に摺接するラジアルリップを有する第２シールリングと
を備えることを特徴とする密封装置。 This is applied to a rolling bearing having an outer ring fixed to the rotating member and an inner ring fixed to the stationary member, and seals the opening at the axial end of the space formed by the inner peripheral surface of the outer ring and the outer peripheral surface of the inner ring. In the sealing device,
A slinger comprising a first cylindrical portion fixed to the inner peripheral surface of the outer ring, and a first flange portion extending from the axially outer end of the first cylindrical portion toward the inner ring side;
A metal core comprising a second cylindrical portion fixed to the outer peripheral surface of the inner ring facing the first cylindrical portion, and a second flange portion extending from the axially inner end of the second cylindrical portion to the outer ring side;
A first seal ring fixed to the slinger and having an axial lip that is in sliding contact with the second flange portion in a state where the tip is directed to the inner ring side;
A sealing device comprising: a second seal ring having a radial lip fixed to the core metal and in sliding contact with the first cylindrical portion. 請求項１に記載の密封装置において、
前記アキシャルリップは、前記第１フランジ部の内周先端から、略直線状に延びて前記第２フランジ部に摺接していることを特徴とする密封装置。 The sealing device according to claim 1,
The sealing device according to claim 1, wherein the axial lip extends substantially linearly from an inner peripheral tip of the first flange portion and is in sliding contact with the second flange portion.
JP2006259691A 2006-09-25 2006-09-25 Sealing device Pending JP2008082351A (en)

Priority Applications (1)

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JP2008082351A true JP2008082351A (en) 2008-04-10

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101366143B1 (en) * 2012-06-08 2014-02-24 주식회사 일진글로벌 Sealing apparatus of wheel bearing
CN116771801A (en) * 2023-08-17 2023-09-19 河北亚超轴承集团有限公司 Hub bearing

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101366143B1 (en) * 2012-06-08 2014-02-24 주식회사 일진글로벌 Sealing apparatus of wheel bearing
CN116771801A (en) * 2023-08-17 2023-09-19 河北亚超轴承集团有限公司 Hub bearing
CN116771801B (en) * 2023-08-17 2023-10-20 河北亚超轴承集团有限公司 Hub bearing

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