JP2007092889A

JP2007092889A - Rolling bearing

Info

Publication number: JP2007092889A
Application number: JP2005283550A
Authority: JP
Inventors: Takahiro Wakuta; 貴裕和久田
Original assignee: NTN Corp; NTN Toyo Bearing Co Ltd
Current assignee: NTN Corp
Priority date: 2005-09-29
Filing date: 2005-09-29
Publication date: 2007-04-12

Abstract

<P>PROBLEM TO BE SOLVED: To increase corrosion resistance of a metallic plate forming a sealing member by an inexpensive means. <P>SOLUTION: Corrosion resistance of the metallic plate 5a of a contact seal 5 as the sealing member formed by the metallic plate 5a and rubber 5b is increased by forming the metallic plate 5a by a hot dipping steel plate having a plated layer A formed by Zn-6%Al-3%Mg alloy by the inexpensive means. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

本発明は、内輪と外輪間の軸受空間の少なくとも片側をシール部材でシールした転がり軸受に関する。 The present invention relates to a rolling bearing in which at least one side of a bearing space between an inner ring and an outer ring is sealed with a seal member.

ダストや水等が飛散する環境で使用される転がり軸受には、これらが内輪と外輪間の軸受空間へ侵入するのを防止するために、軸受空間の片側または両側をシール部材でシールしたものがある。このシール部材には、シールド板やスリンガのように金属板のみで形成されたものと、接触シールやパックシールのように金属板とゴム等の弾性体で形成されたものとがある。また、これらのシール部材を２重や３重に設けたものもある。 Rolling bearings used in an environment where dust, water, etc. scatters have seals on one or both sides of the bearing space sealed with a sealing member to prevent them from entering the bearing space between the inner and outer rings. is there. This seal member includes a member formed of only a metal plate such as a shield plate and a slinger, and a member formed of an elastic body such as a metal plate and rubber such as a contact seal and a pack seal. Some of these sealing members are provided in double or triple.

上述したシール部材を形成する金属板には、加工性の優れた鋼板が多く用いられ、打ち抜き加工後にプレス加工によって様々の形状に成形される。めっき層が薄くて加工性のよい電気めっき鋼板を用いることもある。 Steel plates having excellent workability are often used for the metal plate forming the sealing member described above, and are formed into various shapes by press working after punching. An electroplated steel sheet having a thin plating layer and good workability may be used.

上述した金属板に鋼板を用いたシール部材は、泥水等が飛散する環境で使用されると、錆が発生しやすく耐食性を確保できない問題がある。電気めっき鋼板を用いる場合も、めっき層のない打ち抜き切断面から錆が発生するとともに、電気めっきの薄いめっき層では十分な耐食性を確保できない問題がある。 When the sealing member using a steel plate as the metal plate described above is used in an environment where muddy water or the like scatters, there is a problem that rust is likely to occur and corrosion resistance cannot be secured. Even when an electroplated steel sheet is used, rust is generated from a punched and cut surface without a plating layer, and there is a problem that sufficient corrosion resistance cannot be ensured with a thin electroplating layer.

このようなシール部材を形成する金属板の耐食性を高めるためには、金属板にステンレス鋼板を用いたり、成形後の部品にバレルめっき等でめっきを施すことが考えられる。しかしながら、ステンレス鋼板を用いる方法は、素材コストが高くなるとともに、変形強度の高いステンレス鋼板のプレス加工が難しい問題がある。また、バレルめっき等でめっきを施す方法は、別途のめっき工程を必要とするので、製造コストが高くなる。 In order to improve the corrosion resistance of the metal plate forming such a seal member, it is conceivable to use a stainless steel plate for the metal plate or to plate the molded part by barrel plating or the like. However, the method using a stainless steel plate has a problem that it is difficult to press the stainless steel plate having a high deformation strength as the material cost increases. Moreover, since the method of plating by barrel plating or the like requires a separate plating step, the manufacturing cost increases.

そこで、本発明の課題は、安価な手段でシール部材を形成する金属板の耐食性を高めることである。 Then, the subject of this invention is improving the corrosion resistance of the metal plate which forms a sealing member by an inexpensive means.

上記の課題を解決するために、本発明は、内輪と外輪間の軸受空間の少なくとも片側を、金属板、または金属板と弾性体で形成されたシール部材でシールした転がり軸受において、前記金属板をＺｎ−６％Ａｌ−３％Ｍｇ合金で形成されためっき層を有する溶融めっき鋼板で形成した構成を採用した。 In order to solve the above problems, the present invention provides a rolling bearing in which at least one side of a bearing space between an inner ring and an outer ring is sealed with a metal plate or a seal member formed of a metal plate and an elastic body. The structure which formed with the hot dip plated steel plate which has a plating layer formed with Zn-6% Al-3% Mg alloy was employ | adopted.

前記Ｚｎ−６％Ａｌ−３％Ｍｇ合金で形成されためっき層は、優れた加工性を有するとともに、時間の経過によって、下層のＡｌとＭｇを含むＺｎ系保護皮膜と、上層のＭｇを含むＺｎ系保護皮膜とから成る緻密で付着性の強い２層構造の保護皮膜が表面に形成され、めっき層の腐食を抑制して非常に優れた耐食性を発揮する。また、このめっき層は、裸の切断面が生じると、めっき層から溶け出すＡｌとＭｇを含む緻密なＺｎ系保護皮膜が切断面を覆い、切断面の耐食性を確保する。したがって、前記金属板をＺｎ−６％Ａｌ−３％Ｍｇ合金で形成されためっき層を有する溶融めっき鋼板で形成することにより、安価な手段でシール部材を形成する金属板の耐食性を高めることができる。 The plating layer formed of the Zn-6% Al-3% Mg alloy has excellent workability, and as time passes, includes a Zn-based protective film containing lower Al and Mg, and upper Mg. A two-layered protective film having a dense and strong adhesion composed of a Zn-based protective film is formed on the surface, and the corrosion of the plating layer is suppressed and very excellent corrosion resistance is exhibited. In addition, when a bare cut surface is generated in this plating layer, a dense Zn-based protective film containing Al and Mg that dissolves from the plating layer covers the cut surface, and ensures corrosion resistance of the cut surface. Therefore, by forming the metal plate with a hot-dip plated steel plate having a plating layer formed of a Zn-6% Al-3% Mg alloy, the corrosion resistance of the metal plate forming the seal member can be improved by inexpensive means. it can.

本発明の転がり軸受は、シール部材を形成する金属板を、Ｚｎ−６％Ａｌ−３％Ｍｇ合金で形成されためっき層を有する溶融めっき鋼板で形成したので、安価な手段でその耐食性を高めることができる。 In the rolling bearing of the present invention, the metal plate forming the seal member is formed of a hot-dip plated steel plate having a plating layer formed of a Zn-6% Al-3% Mg alloy, so that its corrosion resistance is improved by inexpensive means. be able to.

以下、図面に基づき、本発明の実施形態を説明する。図１（ａ）、（ｂ）は、第１の実施形態を示す。この転がり軸受は、図１（ａ）に示すように、内輪１と外輪２の間でボール３が保持器４に保持された軸受空間の両側を、芯金の金属板５ａと弾性体としてのゴム５ｂとで形成されたシール部材としての接触シール５でシールした玉軸受であり、図１（ｂ）に示すように、金属板５ａはＺｎ−６％Ａｌ−３％Ｍｇ合金で形成されためっき層Ａを有する溶融めっき鋼板で形成されている。 Hereinafter, embodiments of the present invention will be described with reference to the drawings. 1A and 1B show a first embodiment. As shown in FIG. 1 (a), this rolling bearing has a metal core 5a and an elastic body on both sides of a bearing space where a ball 3 is held by a cage 4 between an inner ring 1 and an outer ring 2. It is a ball bearing sealed with a contact seal 5 as a seal member formed with rubber 5b, and as shown in FIG. 1 (b), the metal plate 5a is formed of a Zn-6% Al-3% Mg alloy. It is formed of a hot-dip plated steel sheet having a plating layer A.

図２は、第２の実施形態を示す。この転がり軸受も玉軸受であり、内輪１と外輪２の間でボール３が保持器４に保持された軸受空間の両側が、金属板６ａのみで形成されたシール部材としてのシールド板６でシールされている。図示は省略するが、この金属板６ａもＺｎ−６％Ａｌ−３％Ｍｇ合金で形成されためっき層Ａを有する溶融めっき鋼板で形成されている。 FIG. 2 shows a second embodiment. This rolling bearing is also a ball bearing, and both sides of the bearing space in which the ball 3 is held by the cage 4 between the inner ring 1 and the outer ring 2 are sealed with a shield plate 6 as a sealing member formed only of the metal plate 6a. Has been. Although illustration is omitted, this metal plate 6a is also formed of a hot dip plated steel plate having a plating layer A formed of a Zn-6% Al-3% Mg alloy.

図３は、第３の実施形態を示す。この転がり軸受も玉軸受であり、内輪１と外輪２の間でボール３が保持器４に保持された軸受空間の両側が、第１の実施形態と同様の接触シール５と、金属板７ａのみで形成されたシール部材としてのスリンガ７とで、内外２重にシールされている。図示は省略するが、この金属板７ａもＺｎ−６％Ａｌ−３％Ｍｇ合金で形成されためっき層Ａを有する溶融めっき鋼板で形成されている。 FIG. 3 shows a third embodiment. This rolling bearing is also a ball bearing, and both sides of the bearing space in which the ball 3 is held by the cage 4 between the inner ring 1 and the outer ring 2 are only the contact seal 5 and the metal plate 7a as in the first embodiment. And the slinger 7 as a sealing member formed in (2) and (2) inside and outside. Although illustration is omitted, the metal plate 7a is also formed of a hot-dip plated steel plate having a plating layer A formed of a Zn-6% Al-3% Mg alloy.

図４は、第４の実施形態を示す。この転がり軸受は、内輪１と外輪２の間の軸受空間で、２列のボール３が保持器４に保持された複列玉軸受であり、軸受空間の片側が第１の実施形態と同様の接触シール５でシールされ、これと反対側が、外環の金属板８ａと内環の金属板８ｂと弾性体としてのゴム８ｃとで形成されたシール部材としてのパックシール８でシールされている。図示は省略するが、パックシール８の各金属板８ａ、８ｂも、Ｚｎ−６％Ａｌ−３％Ｍｇ合金で形成されためっき層Ａを有する溶融めっき鋼板で形成されている。 FIG. 4 shows a fourth embodiment. This rolling bearing is a double-row ball bearing in which two rows of balls 3 are held by a cage 4 in a bearing space between the inner ring 1 and the outer ring 2, and one side of the bearing space is the same as that of the first embodiment. It is sealed with a contact seal 5, and the opposite side is sealed with a pack seal 8 as a seal member formed by an outer ring metal plate 8a, an inner ring metal plate 8b and rubber 8c as an elastic body. Although illustration is omitted, each of the metal plates 8a and 8b of the pack seal 8 is also formed of a hot dip plated steel plate having a plating layer A formed of a Zn-6% Al-3% Mg alloy.

上述した各実施形態では、転がり軸受を単列と複列の玉軸受としたが、本発明に係る転がり軸受は、ころ軸受等の他の種類の転がり軸受にも採用することができる。さらに、シール部材も各実施形態のものに限定されることはなく、シール部材は金属板を有するものであればよい。 In each of the above-described embodiments, the rolling bearing is a single-row and double-row ball bearing. However, the rolling bearing according to the present invention can also be used for other types of rolling bearings such as a roller bearing. Furthermore, the sealing member is not limited to that of each embodiment, and the sealing member only needs to have a metal plate.

ａは第１の実施形態の転がり軸受を示す縦断面図、ｂはａの金属板を拡大して示す断面図a is a longitudinal sectional view showing the rolling bearing of the first embodiment, and b is an enlarged sectional view showing a metal plate of a. 第２の実施形態の転がり軸受を示す縦断面図The longitudinal cross-sectional view which shows the rolling bearing of 2nd Embodiment 第３の実施形態の転がり軸受を示す縦断面図The longitudinal cross-sectional view which shows the rolling bearing of 3rd Embodiment 第４の実施形態の転がり軸受を示す縦断面図The longitudinal cross-sectional view which shows the rolling bearing of 4th Embodiment

符号の説明Explanation of symbols

Ａめっき層
１内輪
２外輪
３ボール
４保持器
５接触シール
５ａ金属板
５ｂゴム
６シールド板
６ａ金属板
７スリンガ
７ａ金属板
８パックシール
８ａ、８ｂ金属板
８ｃゴム A plating layer 1 inner ring 2 outer ring 3 ball 4 cage 5 contact seal 5a metal plate 5b rubber 6 shield plate 6a metal plate 7 slinger 7a metal plate 8 pack seals 8a and 8b metal plate 8c rubber

Claims

内輪と外輪間の軸受空間の少なくとも片側を、金属板、または金属板と弾性体で形成されたシール部材でシールした転がり軸受において、前記金属板をＺｎ−６％Ａｌ−３％Ｍｇ合金で形成されためっき層を有する溶融めっき鋼板で形成したことを特徴とする転がり軸受。 In a rolling bearing in which at least one side of a bearing space between an inner ring and an outer ring is sealed with a metal plate or a seal member formed of a metal plate and an elastic body, the metal plate is formed of a Zn-6% Al-3% Mg alloy. A rolling bearing characterized by being formed of a hot-dip plated steel sheet having a plated layer.