JP2005264960A - Ball bearing - Google Patents

Ball bearing Download PDF

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JP2005264960A
JP2005264960A JP2004073937A JP2004073937A JP2005264960A JP 2005264960 A JP2005264960 A JP 2005264960A JP 2004073937 A JP2004073937 A JP 2004073937A JP 2004073937 A JP2004073937 A JP 2004073937A JP 2005264960 A JP2005264960 A JP 2005264960A
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Prior art keywords
inner ring
cylindrical portion
outer ring
seal
ring
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JP2004073937A
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Japanese (ja)
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Yoshitaka Nakagawa
義崇 中川
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Koyo Seiko Co Ltd
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Koyo Seiko Co 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
    • F16C33/7886—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members mounted outside the gap between the inner and outer races, e.g. sealing rings mounted to an end face or outer surface of a 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
    • F16C33/30—Parts of ball or roller bearings
    • F16C33/58—Raceways; Race rings
    • F16C33/588—Races of sheet metal
    • 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

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Rolling Contact Bearings (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To provide a ball bearing of press molding, for exerting a function of a thrust bearing against both of an axial inward force and an axial outward force, and surely preventing the entering of muddy water or the like adhered to an outer race. <P>SOLUTION: An inner race 1 has an inner race cylinder part 11 having an outer circumference with an inner raceway groove 11a, and an inner race flange part 12. The outer race 2 is disposed concentrically with the inner ring cylinder part 11 to have an inner circumference with outer raceway groove 13a. The outer race 2 includes: an outer ring cylinder part 13 whose right end faces the inner ring flange part 12 from the left side; and an outer race flange part 14 extending from a left end part of the outer race cylinder part 13 in an outer diameter direction. A seal 6 between flanges is formed of a cylinder part 18 fitted onto an outer diameter of the outer race 2, and a seal lip 19 disposed to the cylinder part 18 to be in slide-contact with the inner race flange part 12. A weir part 20 is disposed to an outer diameter of the cylinder part 18 of the seal 6 to prevent movement of the muddy water or the like on a seal lip 19 side. <P>COPYRIGHT: (C)2005,JPO&amp;NCIPI

Description

この発明は、玉軸受に関し、特に、内輪および外輪がプレス成形により形成されている玉軸受に関する。   The present invention relates to a ball bearing, and more particularly to a ball bearing in which an inner ring and an outer ring are formed by press molding.

プレス製の玉軸受としては、例えば、特許文献１に記載されているように、２つ１対のプレス製環状板からなるレースの間に複数の玉が配置された構成とされてスラスト玉軸受として使用されるものが知られている。   As a ball bearing made of a press, for example, as described in Patent Document 1, a thrust ball bearing having a configuration in which a plurality of balls are arranged between races made of two pairs of press-made annular plates. What is used as is known.

この玉軸受は、例えば、いずれか一方の環状板がケーシングに支持され、他方が回転体に一体化されることにより、回転体にかかる軸方向の力を受けるスラスト軸受とされる。この場合、軸方向内向きの力に対しては、スラスト軸受の機能を発揮することができるが、軸方向外向きの力に対しては、スラスト軸受の機能を発揮することができないため、軸方向外向きの力がかかる条件下での使用には問題があった。   The ball bearing is, for example, a thrust bearing that receives an axial force applied to the rotating body by supporting one of the annular plates on the casing and integrating the other with the rotating body. In this case, the thrust bearing function can be exerted with respect to the axially inward force, but the axial bearing function cannot be exerted with respect to the axially outward force. There was a problem in use under conditions where an outward force was applied.

そこで、本出願人は、特願２００３−３０２３４９において、外周に内輪軌道溝が形成された内輪円筒部および内輪円筒部の一端部から外径方向にのびる内輪フランジ部を有するプレス製内輪と、内輪円筒部と同心でかつ内周に外輪軌道溝が形成されるとともに一端部が内輪フランジ部に軸方向内方から対向する外輪円筒部および外輪円筒部の他端部から外径方向にのびる外輪フランジ部を有するプレス製外輪と、内輪円筒部と外輪円筒部との間に配置された複数の玉と、玉を保持する保持器とを備えており、軸方向内向きの力および軸方向外向きの力の両方に対して、スラスト軸受の機能を発揮することができる玉軸受を提案した。
特開２００２−２２７８６１号公報 In view of this, the present applicant, in Japanese Patent Application No. 2003-302349, has a press-made inner ring having an inner ring cylindrical portion having an inner ring raceway groove formed on the outer periphery and an inner ring flange portion extending from one end of the inner ring cylindrical portion in the outer diameter direction, and an inner ring. An outer ring raceway groove that is concentric with the cylindrical part and has an outer ring raceway groove formed on the inner periphery and one end of which is opposed to the inner ring flange part from the inside in the axial direction, and an outer ring flange that extends in the outer diameter direction from the other end of the outer ring cylindrical part A press outer ring having a portion, a plurality of balls disposed between the inner ring cylindrical portion and the outer ring cylindrical portion, and a cage for holding the ball, and an axially inward force and an axially outward direction We proposed a ball bearing capable of exerting the function of a thrust bearing against both of these forces.
JP 2002-227861 A

ところで、この種の玉軸受は、内輪回転でも外輪回転でも使用可能であるが、この玉軸受を内輪回転で使用する場合には、外輪に付着した泥水等の浸入を防止することが重要となってくる。   By the way, this type of ball bearing can be used for both inner ring rotation and outer ring rotation. However, when this ball bearing is used for inner ring rotation, it is important to prevent intrusion of muddy water or the like adhering to the outer ring. Come.

この発明の目的は、軸方向内向きの力および軸方向外向きの力の両方に対して、スラスト軸受の機能を発揮することができ、しかも、内輪回転で使用した場合に、外輪に付着した泥水等の浸入をより確実に防止することができるプレス成形製の玉軸受を提供することにある。   The object of the present invention is to exert the function of a thrust bearing with respect to both an axially inward force and an axially outward force, and adheres to the outer ring when used in inner ring rotation. An object of the present invention is to provide a press-molded ball bearing that can more reliably prevent the intrusion of muddy water or the like.

この発明による玉軸受は、外周に内輪軌道溝が形成された内輪円筒部および内輪円筒部の一端部から外径方向にのびる内輪フランジ部を有するプレス製内輪と、内輪円筒部と同心でかつ内周に外輪軌道溝が形成されるとともに一端部が内輪フランジ部に軸方向内方から対向する外輪円筒部および外輪円筒部の他端部から外径方向にのびる外輪フランジ部を有するプレス製外輪と、内輪円筒部と外輪円筒部との間に配置された複数の玉と、玉を保持する保持器と、外輪外径に嵌められた円筒部および円筒部に設けられて内輪フランジ部に摺接しているシールリップからなるフランジ間シールとを備えており、フランジ間シールの円筒部外径に、泥水等がシールリップ側に移動することを防止するせき止め部が設けられていることを特徴とするものである。   A ball bearing according to the present invention includes an inner ring cylindrical portion having an inner ring raceway groove formed on an outer periphery, an inner ring made of a press having an inner ring flange portion extending in an outer diameter direction from one end portion of the inner ring cylindrical portion, a concentric inner ring and an inner ring cylindrical portion. A press outer ring having an outer ring raceway groove formed on the circumference and having an outer ring cylindrical portion whose one end is opposed to the inner ring flange portion from the inside in the axial direction and an outer ring flange portion extending from the other end of the outer ring cylindrical portion in the outer radial direction; A plurality of balls disposed between the inner ring cylindrical portion and the outer ring cylindrical portion, a cage for holding the balls, a cylindrical portion fitted to the outer diameter of the outer ring, and a cylindrical portion provided in sliding contact with the inner ring flange portion. And a seal part that prevents muddy water from moving to the seal lip side on the outer diameter of the cylindrical part of the seal between the flanges. Also It is.

フランジ間シールは、樹脂製とされることがあり、また、ゴム製とされることがある。シールリップと内輪フランジ部との接触の程度は、高速回転での使用に適するように、いわゆる軽接触とされる。軽接触の場合、泥水等がシールリップを通過して軸受内部に浸入しやすいことから、泥水等がシールリップ側に移動することを防止することがより重要となる。フランジ間シールの円筒部の反シールリップ側端部は、外輪フランジ部に当接させられることが好ましい。   The flange-to-flange seal may be made of resin or rubber. The degree of contact between the seal lip and the inner ring flange portion is so-called light contact so as to be suitable for use at high speed rotation. In the case of light contact, since muddy water or the like easily passes through the seal lip and enters the bearing, it is more important to prevent muddy water or the like from moving to the seal lip side. The end portion on the side opposite to the seal lip of the cylindrical portion of the flange-to-flange seal is preferably brought into contact with the outer ring flange portion.

例えば、内輪回転で使用される場合、フランジ間シールは、固定輪となる外輪に設けられていることから、常に固定状態であり、フランジ間シールの円筒部に付着した水、泥水、ダスト等は、せき止め部によってシールリップ側に移動することが防止され、その自重によって下方に排出される。   For example, when used in inner ring rotation, since the seal between flanges is provided on the outer ring which is a fixed ring, it is always fixed, and water, muddy water, dust, etc. adhering to the cylindrical part of the seal between flanges It is prevented from moving to the seal lip side by the damming portion and discharged downward by its own weight.

せき止め部は、１または複数の環状突出部、１または複数の環状溝、傾斜面などとされるが、シールの加工性および軸受への組み込みやすさの点から、環状溝（１つ）とされていることが好ましい。   The damming portion is one or a plurality of annular protrusions, one or a plurality of annular grooves, an inclined surface, etc., but from the viewpoint of workability of the seal and ease of incorporation into the bearing, it is a single annular groove. It is preferable.

上記の玉軸受において、フランジ間シールとは別に、内輪円筒部の他端部と外輪円筒部の他端部との間に設けられた円筒部間シールがさらに設けられていることが好ましい。円筒部間シールは、外輪円筒部内周に固定されてそのシールリップが内輪円筒部外周に対向させられる。   In the ball bearing described above, it is preferable that a seal between the cylindrical portions provided between the other end portion of the inner ring cylindrical portion and the other end portion of the outer ring cylindrical portion is further provided separately from the seal between the flanges. The seal between the cylindrical portions is fixed to the inner periphery of the outer ring cylindrical portion, and the seal lip is opposed to the outer periphery of the inner ring cylindrical portion.

この発明の玉軸受によると、外周に軌道溝が形成された内輪円筒部および内輪円筒部の一端部から外径方向にのびる内輪フランジ部を有するプレス製内輪と、内輪円筒部と同心でかつ内周に軌道溝が形成されるとともに一端部が内輪フランジ部に対向する外輪円筒部および外輪円筒部の他端部から外径方向にのびる外輪フランジ部を有するプレス製外輪と、両輪円筒部間に配置された複数の玉とを備えているので、軸方向内向きの力および軸方向外向きの力の両方に対して、スラスト軸受の機能を発揮することができる。また、外輪外径に嵌められた円筒部および円筒部に設けられて内輪フランジ部に摺接しているシールリップからなるフランジ間シールをさらに備えているとともに、フランジ間シールの円筒部外径に、泥水等がシールリップ側に移動することを防止するせき止め部が設けられているので、内輪が回転輪とされた場合に、外輪に付着した水、泥水、ダスト等の浸入をより確実に防止することができ、内輪回転で使用するのに極めて優れたものとなる。   According to the ball bearing of the present invention, an inner ring cylindrical portion having a raceway groove formed on the outer periphery, a press-made inner ring having an inner ring flange portion extending in an outer diameter direction from one end of the inner ring cylindrical portion, a concentric inner ring and an inner ring cylindrical portion A raceway groove is formed in the circumference and an outer ring cylindrical portion having one end portion facing the inner ring flange portion and an outer ring flange portion extending in an outer diameter direction from the other end portion of the outer ring cylindrical portion, Since the plurality of balls are arranged, the function of the thrust bearing can be exhibited with respect to both the axially inward force and the axially outward force. In addition, a cylindrical portion fitted to the outer diameter of the outer ring and a flange-to-flange seal that is provided in the cylindrical portion and is in sliding contact with the inner ring flange portion are further provided. As the muddy water is prevented from moving to the seal lip side, the intrusion of water, muddy water, dust, etc. adhering to the outer ring is more reliably prevented when the inner ring is a rotating ring. And is extremely excellent for use in inner ring rotation.

この発明の実施の形態を、以下図面を参照して説明する。   Embodiments of the present invention will be described below with reference to the drawings.

図１は、この発明の玉軸受の１実施形態を示している。以下の説明において、左右とは、図の左右をいうものとする。   FIG. 1 shows an embodiment of a ball bearing of the present invention. In the following description, the left and right refer to the left and right in the figure.

玉軸受は、内輪(1)、外輪(2)、両輪(1)(2)の中央部間に配置された複数の玉(3)、玉(3)を保持する保持器(4)、および両輪(1)(2)間に配置された２つの樹脂製シール(5)(6)を備えている。   The ball bearing includes an inner ring (1), an outer ring (2), a plurality of balls (3) disposed between the central portions of both wheels (1) and (2), a cage (4) that holds the balls (3), and Two resin seals (5) and (6) disposed between the two wheels (1) and (2) are provided.

内輪(1)は、例えば、軸方向の両方向に移動可能とされたギヤなどの回転体と一体化され、外輪(2)は、ケーシングなどに支持される。   For example, the inner ring (1) is integrated with a rotating body such as a gear that is movable in both axial directions, and the outer ring (2) is supported by a casing or the like.

内輪(1)および外輪(2)は、いずれもプレス成形により形成されている。   Both the inner ring (1) and the outer ring (2) are formed by press molding.

内輪(1)は、外周に内輪軌道溝(11a)が形成された内輪円筒部(11)と、内輪円筒部(11)の右端部から外径方向にのびる内輪フランジ部(12)とを有している。   The inner ring (1) has an inner ring cylindrical portion (11) having an inner ring raceway groove (11a) formed on the outer periphery and an inner ring flange portion (12) extending from the right end of the inner ring cylindrical portion (11) in the outer diameter direction. doing.

外輪(2)は、内輪円筒部(11)と同心でかつ内周に外輪軌道溝(13a)が形成されるとともに右端部が内輪フランジ部(12)に左方（軸方向内方）から対向する外輪円筒部(13)と、外輪円筒部(13)の左端部から外径方向にのびる外輪フランジ部(14)とを有している。   The outer ring (2) is concentric with the inner ring cylindrical section (11) and has an outer ring raceway groove (13a) formed on the inner circumference, and the right end faces the inner ring flange section (12) from the left (inward in the axial direction). The outer ring cylindrical portion (13) and the outer ring flange portion (14) extending in the outer diameter direction from the left end portion of the outer ring cylindrical portion (13).

玉(3)は、内輪円筒部(11)と外輪円筒部(13)とによって、深溝タイプの玉軸受と同様に支持されている。   The ball (3) is supported by the inner ring cylindrical portion (11) and the outer ring cylindrical portion (13) in the same manner as the deep groove type ball bearing.

２つのシール(5)(6)のうちの一方は、内輪円筒部(11)の左端部と外輪円筒部(13)の左端部との間に設けられた円筒部間シール(5)であり、他方は、外輪フランジ部(14)と内輪フランジ部(12)との間に設けられたフランジ間シール(6)である。   One of the two seals (5) and (6) is an inter-cylindrical seal (5) provided between the left end of the inner ring cylindrical portion (11) and the left end of the outer ring cylindrical portion (13). The other is an inter-flange seal (6) provided between the outer ring flange portion (14) and the inner ring flange portion (12).

円筒部間シール(5)は、孔あきの円板部(15)と、孔あき円板部(15)の外周縁部から右方（軸方向内方）にのびる短円筒部(16)とからなる。短円筒部(16)の外径は、外輪円筒部(13)の内径よりも大きくされている。そして、外輪円筒部(13)の左端部に、これより右にある部分よりも大径のシール嵌め合わせ部(17)が形成されており、このシール嵌め合わせ部(17)の内周に、円筒部間シール(5)の短円筒部(16)の外周部が嵌め入れられて接着されている。シール嵌め合わせ部(17)には、さらに、径方向外方に行くにしたがって細くなる三角形断面の環状溝(17a)が形成されており、円筒部間シール(5)の短円筒部(16)の外周には、この環状溝(17a)にきつく嵌め入れられている環状突起(16a)が形成されている。孔あきの円板部(15)の内周縁部(15a)は、内輪円筒部(11)の外周に若干の径方向間隙をおいて対向させられているシールリップとされており、これにより、内輪円筒部(11)の左端部と外輪円筒部(13)の左端部との間に、非接触シールとしての円筒部間シール(5)が形成されている。   The seal between cylinders (5) consists of a perforated disc (15) and a short cylindrical part (16) extending rightward (inward in the axial direction) from the outer periphery of the perforated disc (15). Become. The outer diameter of the short cylindrical portion (16) is larger than the inner diameter of the outer ring cylindrical portion (13). Then, a seal fitting portion (17) having a larger diameter than the portion on the right side is formed on the left end portion of the outer ring cylindrical portion (13), and on the inner periphery of the seal fitting portion (17), The outer peripheral portion of the short cylindrical portion (16) of the seal between cylindrical portions (5) is fitted and bonded. The seal fitting portion (17) is further formed with an annular groove (17a) having a triangular cross section that becomes thinner as going radially outward, and the short cylindrical portion (16) of the seal between the cylindrical portions (5) An annular protrusion (16a) that is tightly fitted in the annular groove (17a) is formed on the outer periphery of the ring. The inner peripheral edge portion (15a) of the perforated disc portion (15) is a seal lip that is opposed to the outer periphery of the inner ring cylindrical portion (11) with a slight radial gap therebetween. Between the left end portion of the cylindrical portion (11) and the left end portion of the outer ring cylindrical portion (13), an inter-cylindrical seal (5) is formed as a non-contact seal.

フランジ間シール(6)は、内径が外輪円筒部(13)の外径にほぼ等しい円筒部(18)と、円筒部(18)の右端部に設けられて内輪フランジ部(12)の左面に摺接しているシールリップ(19)とからなる。フランジ間シール(6)は、その円筒部(18)が外輪円筒部(13)の外径にきつく嵌め合わされるとともに、円筒部(18)の左端部が外輪フランジ部(14)の立上り基部に当接させられて接着されている。   The flange-to-flange seal (6) is provided on the left side of the inner ring flange portion (12) provided at the cylindrical portion (18) whose inner diameter is substantially equal to the outer diameter of the outer ring cylindrical portion (13) and at the right end of the cylindrical portion (18). The seal lip (19) is in sliding contact. The seal (6) between the flanges has a cylindrical portion (18) that is tightly fitted to the outer diameter of the outer ring cylindrical portion (13), and the left end of the cylindrical portion (18) is at the rising base of the outer ring flange portion (14). It is abutted and bonded.

この実施形態の玉軸受は、内輪回転でかつ高速回転での使用に適するように、フランジ間シール(6)の内輪フランジ部(12)への接触が軽接触とされており、フランジ間シール(6)の円筒部(18)外径には、水、泥水、ダスト等がシールリップ(19)側に移動することを防止するせき止め部としての環状溝(20)が設けられている。環状溝(20)は、断面三角形とされ、円筒部(18)の軸方向長さの略半分の軸方向長さを有している。外輪フランジ部(14)に付着した水、泥水、ダスト等は、この環状溝(20)によって、シールリップ(19)側への移動が阻止されるとともに、その自重によって、環状溝(20)を伝って下方に移動し、排出される。こうして、軸受内部への水、泥水、ダスト等の浸入がより確実に防止される。なお、環状溝(20)の断面形状は、三角形に限られるものでなく、また、図示省略したが、環状溝(20)に代えて、環状突出部からなるせき止め部とすることもできる。   In the ball bearing of this embodiment, the contact between the inner ring flange (12) and the inner ring flange portion (12) of the inter-flange seal (6) is light contact so as to be suitable for use at inner ring rotation and high-speed rotation. The outer diameter of the cylindrical portion (18) of 6) is provided with an annular groove (20) as a damming portion for preventing water, muddy water, dust and the like from moving to the seal lip (19) side. The annular groove (20) has a triangular cross section, and has an axial length that is substantially half the axial length of the cylindrical portion (18). Water, muddy water, dust, etc. adhering to the outer ring flange (14) are prevented from moving toward the seal lip (19) by the annular groove (20), and the weight of the annular groove (20) is reduced by its own weight. It travels down and is discharged. Thus, intrusion of water, muddy water, dust and the like into the bearing is prevented more reliably. The cross-sectional shape of the annular groove (20) is not limited to a triangular shape, and although not shown in the figure, it can be replaced with an annular groove (20) and can be a damming portion comprising an annular protrusion.

内輪軌道溝(11a)および外輪軌道溝(13a)の曲率は、いずれも、玉径の５３〜５６％とされている。上記軸受（深溝タイプの玉軸受）を両方向のアキシアル荷重やモーメント荷重が作用する条件でしかも高速回転で使用すると、これらの荷重により、肩乗り上げが発生し、これに伴う発熱によって早期に故障する可能性がある。そこで、内輪軌道溝(11a)および外輪軌道溝(13a)の曲率をいずれも玉径の５３％以上とすることにより、肩乗り上げが防止され、したがって、高速回転時の内部発熱が抑制され、軸受の損傷を防止することができる。なお、内輪軌道溝(11a)および外輪軌道溝(13a)の曲率を大きくし過ぎると、面圧が大きくなることによって剥離が起こる可能性があるので、内輪軌道溝(11a)および外輪軌道溝(13a)の曲率は、いずれも、玉径の５６％以下とされている。   The curvatures of the inner ring raceway groove (11a) and the outer ring raceway groove (13a) are all 53 to 56% of the ball diameter. When the above bearings (deep groove type ball bearings) are used under conditions where both axial load and moment load are applied in both directions and at high speed, these loads can cause shoulder climbing and premature failure due to the heat generated by this. There is sex. Therefore, by setting the curvatures of the inner ring raceway groove (11a) and the outer ring raceway groove (13a) to be 53% or more of the ball diameter, it is possible to prevent the shoulder from climbing, and therefore, internal heat generation during high-speed rotation is suppressed, and the bearing Can prevent damage. Note that if the curvature of the inner ring raceway groove (11a) and the outer ring raceway groove (13a) is excessively increased, peeling may occur due to an increase in surface pressure, so the inner ring raceway groove (11a) and the outer ring raceway groove ( The curvatures of 13a) are all 56% or less of the ball diameter.

保持器(4)は、樹脂製で冠型とされている。そして、図にＡで示している保持器(4)の背面側の最小肉厚は、玉径の１８〜４０％とされている。この軸受は、プレス製であることから、軌道精度の悪さにより局部的な隙間詰まりが生じる可能性があるので、初期隙間が大きく設定されている。この場合、軸受にモーメント荷重が作用すると、内輪(1)と外輪(2)との相対的な傾きが大きくなり、これに伴って、玉(3)の進み遅れが大きくなって、樹脂製の保持器(4)からの玉(3)の抜けや保持器(4)の破損が発生する可能性がある。そこで、保持器(4)の背面側の最小肉厚Ａは、通常、玉径の１５％程度とされているところ、玉径の１８〜４０％とされており、これにより、保持器(4)からの玉(3)の抜けや保持器(4)の破損が防止されている。   The cage (4) is made of resin and has a crown shape. And the minimum thickness of the back side of the holder | retainer (4) shown by A in the figure is 18 to 40% of a ball diameter. Since this bearing is made of a press, there is a possibility that local gap clogging may occur due to poor track accuracy, so the initial gap is set large. In this case, when a moment load is applied to the bearing, the relative inclination between the inner ring (1) and the outer ring (2) increases, and accordingly, the advance and delay of the ball (3) increases, and the resin-made The ball (3) may come off from the cage (4) or the cage (4) may be damaged. Therefore, the minimum thickness A on the back side of the cage (4) is usually about 15% of the ball diameter, but is 18 to 40% of the ball diameter. ) Is prevented from falling out of the ball (3) and the cage (4).

なお、上記の軸受において、内輪フランジ部(12)および外輪フランジ部(14)は、同じ外径を有するように図示されているが、各フランジ部(12)(14)は、これらが取り付けられる部材に応じて、これをさらに外径方向に延長した外径方向延長部やフランジ部の外周縁部を軸方向に折り曲げた折曲げ縁部などを有するようにしてもよい。   In the above bearing, the inner ring flange portion (12) and the outer ring flange portion (14) are shown to have the same outer diameter, but the flange portions (12) and (14) are attached thereto. Depending on the member, there may be provided an outer diameter direction extension portion which is further extended in the outer diameter direction, a bent edge portion where the outer peripheral edge portion of the flange portion is bent in the axial direction, and the like.

図１は、この発明による玉軸受の１実施形態を示す縦断面図である。FIG. 1 is a longitudinal sectional view showing an embodiment of a ball bearing according to the present invention.

符号の説明Explanation of symbols

(1) 内輪
(2) 外輪
(3) 玉（転動体）
(4) 保持器
(11) 内輪円筒部
(11a) 内輪軌道溝
(12) 内輪フランジ部
(13) 外輪円筒部
(13a) 外輪軌道溝
(14) 外輪フランジ部
(20) 環状溝（せき止め部） (1) Inner ring
(2) Outer ring
(3) Ball (rolling element)
(4) Cage
(11) Inner ring cylinder
(11a) Inner ring raceway groove
(12) Inner ring flange
(13) Outer ring cylindrical part
(13a) Outer ring raceway groove
(14) Outer ring flange
(20) Annular groove (damping part)

Claims (3)

外周に内輪軌道溝が形成された内輪円筒部および内輪円筒部の一端部から外径方向にのびる内輪フランジ部を有するプレス製内輪と、内輪円筒部と同心でかつ内周に外輪軌道溝が形成されるとともに一端部が内輪フランジ部に軸方向内方から対向する外輪円筒部および外輪円筒部の他端部から外径方向にのびる外輪フランジ部を有するプレス製外輪と、内輪円筒部と外輪円筒部との間に配置された複数の玉と、玉を保持する保持器と、外輪外径に嵌められた円筒部および円筒部に設けられて内輪フランジ部に摺接しているシールリップからなるフランジ間シールとを備えており、フランジ間シールの円筒部外径に、泥水等がシールリップ側に移動することを防止するせき止め部が設けられていることを特徴とする玉軸受。   An inner ring cylindrical part with an inner ring raceway groove formed on the outer periphery and a press inner ring having an inner ring flange extending from one end of the inner ring cylindrical part in the outer diameter direction, and an outer ring raceway groove formed concentrically with the inner ring cylindrical part and on the inner circumference A press outer ring having an outer ring cylindrical portion whose one end faces the inner ring flange portion from the inner side in the axial direction and an outer ring flange portion extending in the outer radial direction from the other end portion of the outer ring cylindrical portion, and an inner ring cylindrical portion and an outer ring cylinder A flange comprising a plurality of balls arranged between the outer ring, a cage for holding the balls, a cylindrical portion fitted to the outer diameter of the outer ring, and a seal lip provided on the cylindrical portion and in sliding contact with the inner ring flange portion A ball bearing characterized in that a clogging portion is provided on the outer diameter of the cylindrical portion of the seal between the flanges to prevent muddy water or the like from moving to the seal lip side. せき止め部が環状溝とされている請求項１の玉軸受。   The ball bearing according to claim 1, wherein the damming portion is an annular groove. 内輪回転である請求項１または２の玉軸受。   The ball bearing according to claim 1, wherein the ball bearing is an inner ring rotation.
JP2004073937A 2004-03-16 2004-03-16 Ball bearing Withdrawn JP2005264960A (en)

Priority Applications (1)

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Country Link
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7911765B2 (en) 2005-04-08 2011-03-22 Panasonic Corporation Metalized film capacitor, case mold type capacitor using the same, inverter circuit, and vehicle drive motor drive circuit

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7911765B2 (en) 2005-04-08 2011-03-22 Panasonic Corporation Metalized film capacitor, case mold type capacitor using the same, inverter circuit, and vehicle drive motor drive circuit

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