JPH1113770A - Sealing device for rolling bearing - Google Patents
Sealing device for rolling bearingInfo
- Publication number
- JPH1113770A JPH1113770A JP18767997A JP18767997A JPH1113770A JP H1113770 A JPH1113770 A JP H1113770A JP 18767997 A JP18767997 A JP 18767997A JP 18767997 A JP18767997 A JP 18767997A JP H1113770 A JPH1113770 A JP H1113770A
- Authority
- JP
- Japan
- Prior art keywords
- seal
- core
- ring
- rolling bearing
- sealing device
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Abstract
Description
【0001】[0001]
【発明の属する技術分野】この発明は、転がり軸受の密
封装置、特に圧力が作用するエンジンのクランク軸の転
がり軸受の密封装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sealing device for a rolling bearing, and more particularly to a sealing device for a rolling bearing of a crankshaft of an engine on which pressure is applied.
【0002】[0002]
【従来の技術】従来の転がり軸受の密封装置は、内輪
と、外輪と、内外輪間に介装した転動体と、外輪の端部
内周面に形成した周溝に嵌合固定され、内輪との間に密
封部を形成するリップが形成されたシール板とからな
り、上記シール板にはゴムのシール本体に金属製芯金が
耐圧向上のために埋設されている。上記リップは内輪の
端部外周面に形成したシール溝の側壁に軽く接触してい
る。そして、外圧がシール板に作用して特に芯金にて圧
力を受ける耐圧構造であるため、リップの接触圧はほぼ
変化しないようにされている。2. Description of the Related Art A conventional rolling bearing sealing device includes an inner ring, an outer ring, a rolling element interposed between the inner and outer rings, and a circumferential groove formed on an inner circumferential surface at an end of the outer ring. A sealing plate having a lip forming a sealing portion between them, and a metal core is embedded in a rubber sealing body in the sealing plate to improve pressure resistance. The lip is in light contact with the side wall of the seal groove formed on the outer peripheral surface of the end of the inner ring. The contact pressure of the lip hardly changes because of a pressure-resistant structure in which an external pressure acts on the seal plate to receive the pressure, particularly at the core.
【0003】[0003]
【発明が解決しようとする課題】従来、エンジンのクラ
ンク軸のように外圧が比較的大きい部位に使用された場
合、上記転がり軸受の密封装置におけるシール板は芯金
で耐圧性をもたせているものゝ、どうしてもシール板の
変形が大きくなってリップの内輪に対する接触圧が高く
なり、リップ摩耗が大きくなる問題が発生しやすい。さ
らに、このシール板の変形を防止するため芯金の板厚を
大きくすることが行われるが、板厚を大きくすると設計
的にシール板の軸方向寸法の増加につながるため、軸受
によってはリップを固定する外輪のシール嵌合溝の形状
を特殊形状にしなければならないことがあり、加工が面
倒となる。Conventionally, when used in a part where the external pressure is relatively large, such as a crankshaft of an engine, a seal plate in the sealing device of the rolling bearing is made of a metal core and has pressure resistance. (4) The deformation of the seal plate is inevitably increased, the contact pressure of the lip against the inner ring is increased, and the problem of increased lip wear is likely to occur. Furthermore, in order to prevent the deformation of the sealing plate, the thickness of the core metal is increased.However, if the thickness is increased, the dimension of the sealing plate in the axial direction is increased by design. In some cases, the shape of the seal fitting groove of the outer ring to be fixed must be made a special shape, which makes the processing complicated.
【0004】そこで、この発明の目的は、シール板の芯
金の板厚を大きくすることなく剛性を向上させることの
できる転がり軸受の密封装置を提供することにある。SUMMARY OF THE INVENTION It is an object of the present invention to provide a rolling bearing sealing device capable of improving rigidity without increasing the thickness of a core of a sealing plate.
【0005】[0005]
【課題を解決するための手段】上記課題を解決するため
の手段として、内輪と、外輪と、内外輪間に介装した転
動体と、一方の軌道輪に固定するとともに他方の軌道輪
との間に形成する密封部にて内外輪間を密封したシール
板とを有する転がり軸受の密封装置において、上記シー
ル板は、金属製芯金とこの芯金を覆いかつ上記密封部を
形成するリップを有するゴムのシール本体とから形成
し、上記芯金に軟窒化処理を施したことを特徴とする。Means for Solving the Problems As means for solving the above-mentioned problems, an inner race, an outer race, a rolling element interposed between the inner and outer races, and one of the races fixed to one race and the other race. In a sealing device for a rolling bearing having a sealing plate that seals between inner and outer rings with a sealing portion formed therebetween, the sealing plate includes a metal core and a lip that covers the core and forms the sealing portion. And a soft nitriding treatment of the core metal.
【0006】[0006]
【発明の実施の形態】以下、この発明の具体的実施形態
について図面を参照して説明する。図1は、この発明に
かかる一実施例であり、内輪1と外輪2間に保持器3に
て保持された玉4が介装されている。外輪2の一端部内
周面2aには後述するシール板7嵌合用の周溝5が形成
され、またこの外輪2の周溝5に対応する側の内輪1の
一端部外周面1aには、周段部6が形成されている。上
記シール板7は、図2のように断面略三角形の外周突部
8aと内周リップ8bを有するゴムからなるシール本体
8と、シール本体8に埋設され外周円筒部9aと半径方
向フランジ9bからなる炭素鋼板(例えば、SPCC)
の断面略L形の金属製芯金9とから構成されている。上
記シール板7の外周突部8aは外輪2の周溝5に圧入嵌
合されてシール板7が外輪2に嵌合固定される。また、
上記リップ8bは芯金9のフランジ9bの軸受内部側の
側面に突設されており、内輪1の周段部6の側面6aに
軽く接触させられている。Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows an embodiment according to the present invention, in which a ball 4 held by a retainer 3 is interposed between an inner ring 1 and an outer ring 2. A peripheral groove 5 for fitting a seal plate 7 to be described later is formed on an inner peripheral surface 2 a of one end of the outer ring 2, and an outer peripheral surface 1 a of one end of the inner ring 1 on a side corresponding to the peripheral groove 5 of the outer ring 2 has a peripheral surface. A step 6 is formed. As shown in FIG. 2, the seal plate 7 is composed of a seal body 8 made of rubber having an outer peripheral projection 8a having a substantially triangular cross section and an inner peripheral lip 8b, an outer cylindrical portion 9a embedded in the seal body 8, and a radial flange 9b. Carbon steel plate (for example, SPCC)
And a metal core 9 having a substantially L-shaped cross section. The outer peripheral projection 8a of the seal plate 7 is press-fitted into the peripheral groove 5 of the outer ring 2 so that the seal plate 7 is fitted and fixed to the outer ring 2. Also,
The lip 8b protrudes from a side surface of the flange 9b of the metal core 9 on the inner side of the bearing, and is lightly brought into contact with the side surface 6a of the peripheral step portion 6 of the inner ring 1.
【0007】なお、芯金はフランジ9bの軸受内部側の
一部が露出するようにシール本体に埋設されている。さ
らに、芯金9の材料は炭素鋼板以外に例えばステンレス
材を使用してもよい。また、シール板7は内外輪1,2
の一端部に配置された場合について説明したが、内外輪
1,2の他端部にも同様構造のシール板を配置してもよ
いものである。The core metal is embedded in the seal body so that a part of the flange 9b on the inner side of the bearing is exposed. Further, the material of the core metal 9 may be, for example, a stainless steel material other than the carbon steel plate. Further, the seal plate 7 includes inner and outer rings 1 and 2.
Although the case where the seal plate is disposed at one end is described, a seal plate having the same structure may be disposed at the other end of the inner and outer rings 1 and 2.
【0008】上記金属製芯金9は、表面の硬度を高くし
て剛性を向上させるため、タフトライド処理あるいはガ
ス軟窒化処理等にて軟窒化処理を施している。これによ
り、芯金9は表面のみ硬度が高くされている。The metal core 9 is subjected to a soft nitriding treatment such as a tuftride treatment or a gas nitrocarburizing treatment in order to increase the surface hardness and improve the rigidity. Thereby, the hardness of the core metal 9 is increased only on the surface.
【0009】[0009]
【発明の効果】以上詳述したように、シール板の金属製
芯金に軟窒化処理を施すことにより、シール板の芯金の
板厚を大きくすることなく剛性を向上させることができ
るため、外圧が作用してもシール板の変形量が少なくリ
ップの摩耗が小さくすることができるとともに、従来の
シール嵌合用周溝が使用できシール板嵌合用周溝の特殊
な加工が不要となる。As described above in detail, the stiffness can be improved without increasing the thickness of the core metal of the seal plate by subjecting the metal core of the seal plate to the soft nitriding treatment. Even when external pressure acts, the amount of deformation of the seal plate is small and the wear of the lip can be reduced, and the conventional circumferential groove for fitting the seal can be used, so that special processing of the circumferential groove for fitting the seal plate becomes unnecessary.
【図1】この発明の転がり軸受の密封装置の断面図であ
る。FIG. 1 is a cross-sectional view of a rolling bearing sealing device of the present invention.
【図2】この発明のシール体の断面図である。FIG. 2 is a sectional view of the seal body of the present invention.
1 内輪 2 外輪 4 転動体 5 周溝 6 周段部 7 シール板 8 シール本体 9 芯金 DESCRIPTION OF SYMBOLS 1 Inner ring 2 Outer ring 4 Rolling element 5 Peripheral groove 6 Peripheral step part 7 Seal plate 8 Seal body 9 Core metal
Claims (1)
動体と、一方の軌道輪に固定するとともに他方の軌道輪
との間に形成する密封部にて内外輪間を密封したシール
板とを有する転がり軸受の密封装置において、上記シー
ル板は、金属製芯金とこの芯金を覆いかつ上記密封部を
形成するリップを有するゴムのシール本体とから形成
し、上記芯金に軟窒化処理を施したことを特徴とする転
がり軸受の密封装置。An inner ring, an outer ring, a rolling element interposed between the inner and outer rings, and a sealing portion formed between the inner ring and the inner ring and a rolling element fixed to one of the ring rings and sealed between the inner and outer rings. In a sealing device for a rolling bearing having a seal plate, the seal plate is formed of a metal core and a rubber seal body having a lip that covers the core and forms the sealing portion. A sealing device for a rolling bearing, which is subjected to a soft nitriding treatment.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP18767997A JPH1113770A (en) | 1997-06-27 | 1997-06-27 | Sealing device for rolling bearing |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP18767997A JPH1113770A (en) | 1997-06-27 | 1997-06-27 | Sealing device for rolling bearing |
Publications (1)
Publication Number | Publication Date |
---|---|
JPH1113770A true JPH1113770A (en) | 1999-01-22 |
Family
ID=16210251
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP18767997A Pending JPH1113770A (en) | 1997-06-27 | 1997-06-27 | Sealing device for rolling bearing |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH1113770A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2002188651A (en) * | 2000-12-22 | 2002-07-05 | Koyo Seiko Co Ltd | Sealing device and roller bearing |
-
1997
- 1997-06-27 JP JP18767997A patent/JPH1113770A/en active Pending
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2002188651A (en) * | 2000-12-22 | 2002-07-05 | Koyo Seiko Co Ltd | Sealing device and roller bearing |
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Legal Events
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Effective date: 20050621 Free format text: JAPANESE INTERMEDIATE CODE: A131 |
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A911 | Transfer of reconsideration by examiner before appeal (zenchi) |
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A912 | Removal of reconsideration by examiner before appeal (zenchi) |
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