JP4207589B2 - Oblique contact ball bearing - Google Patents

Oblique contact ball bearing Download PDF

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Publication number
JP4207589B2
JP4207589B2 JP2003026568A JP2003026568A JP4207589B2 JP 4207589 B2 JP4207589 B2 JP 4207589B2 JP 2003026568 A JP2003026568 A JP 2003026568A JP 2003026568 A JP2003026568 A JP 2003026568A JP 4207589 B2 JP4207589 B2 JP 4207589B2
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Japan
Prior art keywords
shoulder
ring
outer ring
ball
ball bearing
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Expired - Fee Related
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JP2003026568A
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Japanese (ja)
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JP2004239298A (en
Inventor
福光 北内
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JTEKT Corp
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JTEKT Corp
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Description

【0001】
【発明の属する技術分野】
この発明は、二輪自動車のステアリングステムとヘッドパイプとの間に介在されるステアリング用転がり軸受等に好適な斜接玉軸受に関する。
【0002】
【従来の技術】
従来、大型の二輪自動車で使用されるステアリング用転がり軸受として、ステアリングステムに固定される内輪と、ヘッドパイプに固定される外輪と、両輪間に配置された円錐ころと、円錐ころを保持する保持器とを備えているものが知られている。
【0003】
この円錐ころ軸受では、操舵フィーリングの向上や寿命の延長などの観点から、トルク低減の要望があり、玉軸受への変更が課題となっている。二輪自動車のステアリング用転がり軸受として玉軸受を使用する場合、大きな予圧を与えたときに疑似圧痕または圧痕が発生するという問題があることから、保持器をなくして転動体の数を増やすことにより、作用面圧を減少することが提案されている(特許文献1)。保持器を省略した転がり軸受は、特許文献2にも記載されている。
【0004】
【特許文献1】
特開平8−74861号公報
【0005】
【特許文献2】
特開平11−62995号公報
【0006】
【発明が解決しようとする課題】
保持器を省略したステアリング用転がり軸受の場合には、ステアリングの組立時に転動体がばらけるという問題を解消する必要があるほか、強度や振動吸収性を確保することなどが新たな課題として挙げられる。
【0007】
この発明の目的は、転動体がばらけることを防止して保持器を省略し、これにより、転動体の数を増加して、軸受を大きくすることなく容量を上げることを可能とするとともに、強度や振動吸収性も向上させた斜接玉軸受を提供することにある。
【0008】
【課題を解決するための手段および発明の効果】
この発明による斜接玉軸受は、軌道溝およびこれに連なる肩部を有する内輪と、軌道溝およびこれに連なる肩部を有する外輪と、両輪間に配置されたと、の周りの内外輪間の間隙に封入された固形潤滑材とを備えている斜接玉軸受であって内輪の反肩部側の端 面は、外輪の肩部側端面よりも軸方向内方に位置させられ、外輪の反肩部側の端面は、内輪の肩部側端面よりも軸方向内方に位置させられており、固形潤滑材は、外輪の反肩部側に配置されて玉の外側部分を覆う外側部と、内輪の反肩部側に配置されて玉の内側部分を覆う内側部とを有し、外側部に、内輪の肩部の外周に対向する内輪肩ガイド部が設けられ、内側部に、外輪の肩部の内周に対向する外輪肩ガイド部が設けられ、外側部および内側部の少なくとも一方に、内外輪の反肩部側の端面に対向する端ガイド部が設けられていることを特徴とするものである。
【0009】
固形潤滑材は、樹脂と潤滑成分との混合物が固形化されたもので、樹脂成分は、例えば、ポリエチレン等の熱可塑性樹脂、ポリウレタン等の熱硬化性樹脂とされ、潤滑成分は、潤滑油(ポリαオレフィン、ジエステル、パーフロロポリエーテル等の合成油または鉱物油等)、グリースなどとされる。
【0010】
固形潤滑材は、内輪の肩部の外周面および外輪の反肩部側(カウンタボア側)の端面によって区画された円筒状領域に配置されて玉の外側部分を覆う外側部と、外輪の肩部の内周面および内輪の反肩部側(カウンタボア側)の端面によって区画された円筒状領域に配置されて玉の内側部分を覆う内側部からなるものとされ、外側部に、内輪の肩部の外周にわずかの間隙をおいて対向する内輪肩ガイド部が設けられ、内側部に、外輪の肩部の内周にわずかの間隙をおいて対向する輪肩ガイド部が設けられる。さらに、外側部には、外輪の反肩部側の端面にわずかの間隙をおいて対向する外輪端ガイド部が設けられ、内側部には、内輪の反肩部側の端面にわずかの間隙をおいて対向する内輪端ガイド部が設けられる。外輪端ガイド部および内輪端ガイド部については、内輪の反肩部側の端面が玉の中心よりも軸方向の外方に位置させられている場合には、内輪端ガイド部を省略することができ、外輪の反肩部側の端面が玉の中心よりも軸方向の外方に位置させられている場合には、外輪端ガイド部を省略することができる。
【0011】
この発明の斜接玉軸受によると、の周りの内外輪間の間隙に固形潤滑材が封入されているので、保持器を使用しなくても、がばらけることはなく、保持器を使用しない分だけ、の数を例えば2個程度増やすことができ、この結果、軸受を大きくすることなく容量を上げることができる。また、固形潤滑材が、内外輪の肩部に対向する肩ガイド部と、少なくとも一方の軌道輪の端部に対向する端ガイド部とを有しているので、斜接玉軸受の強度が固形潤滑材によって増強され、タイヤから伝わってくる振動を軌道輪と固形潤滑材とによって吸収することができ、しかも、水の侵入を防止するラビリンスとしての機能が付与される。また、固形潤滑材が自己潤滑性を有していることから、疑似圧痕が防止されるとともに、グリスの封入作業を不要とすることができるので、この斜接玉軸受が使用されるステアリング部等の組立作業を手を汚さずにしかも簡単にかつ早く行うことができる。
【0012】
【発明の実施の形態】
この発明の実施の形態を、以下図面を参照して説明する。以下の説明において、上下および左右は、図の上下および左右をいうものとする。
【0013】
図1は、この発明による斜接玉軸受が使用される一例である二輪自動車のステアリング部を示し、図2および図3は、この発明による斜接玉軸受の実施形態を示している。
【0014】
二輪自動車のステアリング部は、フロントフォーク(1)が上端部に取り付けられているステアリングステム(2)と、ステアリングステム(2)に外挿されたヘッドパイプ(3)と、ステアリングステム(2)とヘッドパイプ(3)の下端部間に設けられた下側の斜接玉軸受(4)と、同上端部間に設けられた上側の斜接玉軸受(5)と、ステアリングステム(2)の上端部に設けられたおねじ部にねじ合わされてヘッドパイプ(3)を上側の斜接玉軸受(5)を介してステアリングステム(2)に固定する二重ナット(6)(7)と、フロントフォーク(1)をステアリングステム(2)に固定しているナット(8)とを備えている。
【0015】
下側の斜接玉軸受(4)および上側の斜接玉軸受(5)は、同じ形状の斜接玉軸受で、上下を逆にして使用されており、それぞれ、内輪(11)、外輪(12)、両輪(11)(12)間に配置された玉(13)、および玉(13)の周りの内外輪(11)(12)間の間隙に封入された固形潤滑材(14)を備えている。
【0016】
図2は、この発明による斜接玉軸受の第1実施形態である上側の斜接玉軸受(5)の左半部を拡大して示している。同図に示すように、内輪(11)は、軌道溝(15)およびこれの上方に連なる肩部(16)を有し、外輪(12)は、軌道溝(17)およびこれの下方に連なる肩部(18)を有している。内輪(11)の下端面(反肩部側端面すなわちカウンタボア側端面)(11a)と外輪(12)の上端面(反肩部側端面すなわちカウンタボア側端面)(12a)とは、いずれも軸方向ほぼ玉中心位置に位置させられている。
【0017】
固形潤滑材(14)は、高密度ポリエチレンとオイルとの混合物が加熱されて固形化したもので、玉(13)の上半部の外側部分を覆う外側部(19)と、玉(13)の下半部の内側部分を覆う内側部(20)とを有している。
【0018】
固形潤滑材(14)の外側部(19)は、玉(13)に接触する断面円弧状の環状接触面(19a)と、接触面(19a)の下端から径方向外向きにのびる環状下面(19b)と、接触面(19a)の上端から上方にのびる円筒状内面(19c)と、下面(19b)の外端から上方にのびる円筒状外面(19d)と、内面(19c)上端から径方向外向きにのびる環状上面(19e)と、外面(19d)および上面(19e)にわたって形成された環状凹所(19f)を有している。外側部(19)の下面(19b)は、外輪(12)の上端面(12a)にわずかの間隙をおいて対向する外輪端ガイド部とされており、外側部(19)の内面(19c)は、内輪(11)の肩部(16)の外周面にわずかの間隙をおいて対向する内輪肩ガイド部とされている。また、外側部(19)の外面(19d)は、ヘッドパイプ(3)の内周面に接触するパイプ側シール部とされている。外側部(19)の上面(19e)は、内輪(11)の上端面から所定間隙をおいて下方に位置させられている。
【0019】
固形潤滑材(14)の内側部(20)は、玉(13)に接触する断面円弧状の環状接触面(20a)と、接触面(20a)の下端から下向きにのびる円筒状外面(20b)と、接触面(20a)の上端から径方向内向きにのびる上面(20c)と、上面(20c)の外端から下方にのびる円筒状内面(20d)と、外面(20b)および内面(20d)の下端同士をつなぐ環状下面(20e)とを有している。内側部(20)の上面(20c)は、内輪(11)の下端面(11a)にわずかの間隙をおいて対向する内輪端ガイド部とされており、内側部(20)の外面(20b)は、外輪(12)の肩部(18)内周面にわずかの間隙をおいて対向する外輪肩ガイド部とされている。また、内側部(20)の内面(20d)は、ステアリングステム(2)の外周に接触するステム側シール部とされている。内側部(20)の下面(20e)は、外輪(12)の下端面よりわずかに上方に位置させられている。
【0020】
図3は、この発明による斜接玉軸受の第2実施形態を示すもので、図2と同様に、二輪自動車のステアリング部で使用されている上側の斜接玉軸受(5)の左半部を拡大して示している。同図に示すように、斜接玉軸受(5)は、内輪(21)、外輪(22)、両輪(21)(22)間に配置された玉(23)、および玉(23)の周りの内外輪(21)(22)間の間隙に封入された固形潤滑材(24)を備えている。内輪(21)は、軌道溝(25)およびこれの上方に連なる肩部(26)を有し、外輪(22)は、軌道溝(27)およびこれの下方に連なる肩部(28)を有している。外輪(22)の上端面(反肩部側端面すなわちカウンタボア側端面)(22a)は、軸方向ほぼ玉中心位置に位置させられており、内輪(21)の下端面(反肩部側端面すなわちカウンタボア側端面)(21a)は、外輪(22)の上端面(22a)よりも軸方向下方に位置させられている。
【0021】
固形潤滑材(24)は、高密度ポリエチレンとオイルとの混合物が加熱されて固形化したもので、玉(23)の上半部の外側部分を覆う外側部(29)と、玉(23)の下半部の内側部分を覆う内側部(30)とを有している。
【0022】
固形潤滑材(24)の外側部(29)は、玉(23)に接触する断面円弧状の環状接触面(29a)と、接触面(29a)の下端から径方向外向きにのびる環状下面(29b)と、接触面(29a)の上端から上方にのびる円筒状内面(29c)と、下面(29b)の外端から上方にのびる円筒状外面(29d)と、内面(29c)上端から径方向外向きにのびる環状上面(29e)と、外面(29d)および上面(29e)にわたって形成された環状凹所(29f)を有している。外側部(29)の下面(29b)は、外輪(22)の上端面(22a)にわずかの間隙をおいて対向する外輪端ガイド部とされており、外側部(29)の内面(29c)は、内輪(21)の肩部(26)の外周面にわずかの間隙をおいて対向する内輪肩ガイド部とされている。また、外側部(29)の外面(29d)は、ヘッドパイプ(3)の内周面にわずかな間隙をおいて対向するパイプ側シール部とされている。外側部(29)の上面(29e)は、内輪(21)の上端面から所定間隙をおいて下方に位置させられている。
【0023】
固形潤滑材(24)の内側部(30)は、玉(23)に接触する断面円弧状の環状接触面(30a)と、接触面(30a)の下端から下向きにのびる円筒状外面(30b)と、接触面(30a)の上端から下方にのびる円筒状内面(30c)と、外面(30b)および内面(30c)の下端同士をつなぐ環状下面(30d)とを有している。内側部(30)の外面(30b)は、外輪(22)の肩部(28)内周面にわずかの間隙をおいて対向する外輪肩ガイド部とされている。また、内側部(30)の内面(30c)の径は、内輪(21)のカウンタボアの外径より大きくなされ、内側部(30)の下面(30d)は、外輪(22)の下端面より下方に位置させられている。
【0024】
この斜接玉軸受を製造するには、図4に示す型が使用される。図4は、図2に示した斜接玉軸受(5)の固形潤滑材(14)を得るためのもので、その上下については、便宜的に図2の上下に対応させて描いている。この型は、固形潤滑材注入用孔(32)を有する上型(31)と、3分割された下型(33)(34)(35)とからなり、上型(31)に固形潤滑材(14)の外側部(19)となる凹所(36)が形成され、固形潤滑材(14)の内側部(20)となる凹所(37)は、その外面(37a)を規定する下型の外側部分(33)と、その下面(37b)を規定する下型の中間部分(34)と、その内面(37c)を規定する下型の内側部分(35)とによって形成されている。上型(31)および下型(33)(34)(35)とによって玉(13)を保持した状態で、固形潤滑材注入用孔(32)から高密度ポリエチレンとオイルとの混合物を注入した後、加熱しさらに冷却することにより、この混合物は、固形化して潤滑材となる。こうして得られた玉(13)と固形潤滑材(14)との一体物を内外輪(11)(12)間に組み込むことにより、上記斜接玉軸受(5)を得ることができる。
【図面の簡単な説明】
【図1】 この発明による斜接玉軸受が使用される一例である二輪自動車のステアリング部を示す縦断面図である。
【図2】 この発明による斜接玉軸受の第1実施形態を示す縦断面図である。
【図3】 この発明による斜接玉軸受の第2実施形態を示す縦断面図である。
【図4】 この発明による斜接玉軸受の製造過程の一部を示す縦断面図である。
【符号の説明】
(4)(5) 斜接玉軸受
(11)(21) 内輪
(12)(22) 外輪
(13)(23)
(14)(24) 固形潤滑材
(15)(25) 軌道溝
(16)(26) 肩部
(17)(27) 軌道溝
(18)(28) 肩部
(19)(29) 外側部
(19b)(29b) 下面(端ガイド部)
(19c)(29c) 内面(肩ガイド部)
(20)(30) 内側部
(20b)(30b) 外面(肩ガイド部)
(20c) 下面(端ガイド部)
[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an oblique contact ball bearing suitable for a rolling bearing for steering interposed between a steering stem and a head pipe of a motorcycle.
[0002]
[Prior art]
Conventionally, as a rolling bearing for steering used in a large two-wheeled vehicle, an inner ring fixed to a steering stem, an outer ring fixed to a head pipe, a tapered roller disposed between both wheels, and a holding for holding a tapered roller What is equipped with a vessel is known.
[0003]
In this tapered roller bearing, there is a demand for torque reduction from the viewpoint of improving the steering feeling and extending the life, and changing to a ball bearing has become a problem. When using ball bearings as rolling bearings for steering of motorcycles, there is a problem that pseudo indentation or indentation occurs when a large preload is applied, so by eliminating the cage and increasing the number of rolling elements, It has been proposed to reduce the working surface pressure (Patent Document 1). A rolling bearing in which the cage is omitted is also described in Patent Document 2.
[0004]
[Patent Document 1]
Japanese Patent Application Laid-Open No. 8-74861
[Patent Document 2]
JP-A-11-62995 [0006]
[Problems to be solved by the invention]
In the case of a rolling bearing for a steering without a cage, it is necessary to solve the problem that rolling elements are scattered during the assembly of the steering, as well as ensuring strength and vibration absorption. .
[0007]
The object of the present invention is to prevent the rolling elements from being scattered and to omit the cage, thereby increasing the number of rolling elements and increasing the capacity without increasing the bearing, and An object of the present invention is to provide an oblique contact ball bearing with improved strength and vibration absorption.
[0008]
[Means for Solving the Problems and Effects of the Invention]
An oblique contact ball bearing according to the present invention includes an inner ring having a raceway groove and a shoulder portion connected thereto, an outer ring having a raceway groove and a shoulder portion connected thereto, a ball disposed between both wheels, and an inner and outer race around the ball. a angular contact ball bearings and a solid lubricant enclosed in the gap between the end face of the inner ring of the anti-shoulder side, is is positioned axially inwardly than the shoulder-side end surface of the outer ring The end surface on the side opposite to the shoulder of the outer ring is positioned axially inward from the end surface on the shoulder side of the inner ring, and the solid lubricant is disposed on the side opposite to the shoulder of the outer ring so that the outer portion of the ball is covered. The inner ring shoulder guide part is provided on the outer side, the inner ring shoulder guide part facing the outer periphery of the inner ring shoulder part is provided on the outer shoulder part of the inner ring. in part, the outer ring shoulder guide portion facing the inner periphery of the shoulder portion of the outer ring is provided on at least one of the outer portion and the inner portion, the inner and outer rings Is characterized in that the end guide portion facing an end face of Hankata portion side.
[0009]
The solid lubricant is obtained by solidifying a mixture of a resin and a lubrication component. The resin component is, for example, a thermoplastic resin such as polyethylene, or a thermosetting resin such as polyurethane. Synthetic oils or mineral oils such as polyalphaolefins, diesters, perfluoropolyethers, etc.), greases and the like.
[0010]
The solid lubricant is disposed in a cylindrical region defined by the outer peripheral surface of the shoulder portion of the inner ring and the end surface on the opposite shoulder side (counter bore side) of the outer ring, and covers the outer portion of the ball and the shoulder of the outer ring. It is arranged in a cylindrical area defined by the inner peripheral surface of the inner ring and the end surface of the inner ring on the side opposite to the shoulder (counter bore side) and covers the inner part of the ball. inner shoulder guide portion is provided to face at a slight gap on the outer periphery of the shoulder portion, the inner portion, the outer Wakata guide portion is provided facing at a slight gap to the inner periphery of the shoulder portion of the outer ring. Furthermore, the outer ring is provided with an outer ring end guide portion facing the end surface of the outer ring on the side opposite to the shoulder of the outer ring with a slight gap, and the inner side has a slight gap on the end surface of the inner ring on the side opposite to the shoulder. An inner ring end guide portion that is opposed to each other is provided. For the outer ring end guide part and the inner ring end guide part, the inner ring end guide part may be omitted when the end face on the opposite shoulder side of the inner ring is positioned outward in the axial direction from the center of the ball. The outer ring end guide portion can be omitted when the end surface of the outer ring on the side opposite the shoulder is positioned axially outward from the center of the ball.
[0011]
According to the angular contact ball bearing of the present invention, since the gap in the solid lubricant between the inner and outer rings around the ball is sealed, without using the retainer, the ball Gabala kicking it not, the retainer The number of balls can be increased by, for example, about two by the amount not used, and as a result, the capacity can be increased without increasing the size of the bearing. Further, since the solid lubricant has a shoulder guide portion facing the shoulder portion of the inner and outer rings and an end guide portion facing the end portion of at least one of the race rings, the strength of the oblique contact ball bearing is solid. The vibration enhanced by the lubricant and absorbed from the tire can be absorbed by the race and the solid lubricant, and a function as a labyrinth for preventing water from entering is provided. Further, since the solid lubricant has a self-lubricating, with pseudo indentation is prevented, since the encapsulation work grease can be eliminated, a steering unit such that the angular contact ball bearing is used Assembling work can be performed easily and quickly without getting the hands dirty.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings. In the following description, “upper and lower” and “left and right” refer to the upper and lower and left and right in the drawing.
[0013]
FIG. 1 shows a steering part of a two-wheeled vehicle which is an example in which the oblique contact ball bearing according to the present invention is used, and FIGS. 2 and 3 show an embodiment of the oblique contact ball bearing according to the present invention.
[0014]
The steering part of a motorcycle includes a steering stem (2) with a front fork (1) attached to the upper end, a head pipe (3) externally attached to the steering stem (2), and a steering stem (2). The lower oblique contact ball bearing (4) provided between the lower ends of the head pipe (3), the upper oblique contact ball bearing (5) provided between the upper ends, and the steering stem (2). A double nut (6) (7) screwed to a male thread provided at the upper end and fixing the head pipe (3) to the steering stem (2) via the upper oblique contact ball bearing (5); And a nut (8) for fixing the front fork (1) to the steering stem (2).
[0015]
The lower oblique contact ball bearing (4) and the upper oblique contact ball bearing (5) are oblique contact ball bearings of the same shape and are used upside down.The inner ring (11) and outer ring ( 12), a ball (13) disposed between both wheels (11) and (12), and a solid lubricant (14) sealed in a gap between the inner and outer rings (11) and (12) around the ball (13). I have.
[0016]
FIG. 2 is an enlarged view of the left half of the upper contact ball bearing (5) which is the first embodiment of the contact ball bearing according to the present invention. As shown in the figure, the inner ring (11) has a raceway groove (15) and a shoulder (16) continuous above the raceway groove (15), and the outer ring (12) continues to the raceway groove (17) and the lower side thereof. Has a shoulder (18). The lower end surface of the inner ring (11) (the end face on the side opposite to the shoulder, that is, the end face on the counter bore) (11a) and the upper end face of the outer ring (12) (the end face on the side opposite to the shoulder, that is, the end face on the counter bore) (12a) It is located at the ball center position in the axial direction.
[0017]
The solid lubricant (14) is a mixture of high-density polyethylene and oil heated to solidify, the outer part (19) covering the outer part of the upper half of the ball (13), and the ball (13) And an inner part (20) covering the inner part of the lower half of the lower half.
[0018]
The outer part (19) of the solid lubricant (14) includes an annular contact surface (19a) having an arcuate cross section in contact with the ball (13) and an annular lower surface extending radially outward from the lower end of the contact surface (19a) ( 19b), a cylindrical inner surface (19c) extending upward from the upper end of the contact surface (19a), a cylindrical outer surface (19d) extending upward from the outer end of the lower surface (19b), and a radial direction from the upper end of the inner surface (19c) It has an annular upper surface (19e) extending outward and an annular recess (19f) formed over the outer surface (19d) and the upper surface (19e). The lower surface (19b) of the outer portion (19) is an outer ring end guide portion facing the upper end surface (12a) of the outer ring (12) with a slight gap, and the inner surface (19c) of the outer portion (19). The inner ring shoulder guide portion is opposed to the outer peripheral surface of the shoulder portion (16) of the inner ring (11) with a slight gap. Further, the outer surface (19d) of the outer portion (19) is a pipe-side seal portion that comes into contact with the inner peripheral surface of the head pipe (3). The upper surface (19e) of the outer portion (19) is positioned below a predetermined gap from the upper end surface of the inner ring (11).
[0019]
The inner part (20) of the solid lubricant (14) includes an annular contact surface (20a) having a circular arc cross section that contacts the ball (13) and a cylindrical outer surface (20b) extending downward from the lower end of the contact surface (20a). An upper surface (20c) extending radially inward from the upper end of the contact surface (20a), a cylindrical inner surface (20d) extending downward from the outer end of the upper surface (20c), an outer surface (20b) and an inner surface (20d) And an annular lower surface (20e) connecting the lower ends of the two. The upper surface (20c) of the inner portion (20) is an inner ring end guide portion facing the lower end surface (11a) of the inner ring (11) with a slight gap, and the outer surface (20b) of the inner portion (20). The outer ring shoulder guide portion is opposed to the inner peripheral surface of the shoulder portion (18) of the outer ring (12) with a slight gap. The inner surface (20d) of the inner portion (20) is a stem-side seal portion that contacts the outer periphery of the steering stem (2). The lower surface (20e) of the inner part (20) is positioned slightly above the lower end surface of the outer ring (12).
[0020]
FIG. 3 shows a second embodiment of the oblique contact ball bearing according to the present invention. As in FIG. 2, the left half of the upper oblique contact ball bearing (5) used in the steering portion of a two-wheeled vehicle. Is shown enlarged. As shown in the figure, the angular contact ball bearing (5), the inner wheel (21), an outer ring (22), two wheels (21) (22) arranged balls between (23), and balls (23) A solid lubricant (24) enclosed in a gap between the inner and outer rings (21) and (22) is provided. The inner ring (21) has a raceway groove (25) and a shoulder portion (26) continuous above it, and the outer ring (22) has a raceway groove (27) and a shoulder portion (28) continuous below it. is doing. The upper end surface of the outer ring (22) (the end surface on the side opposite to the shoulder, that is, the end surface on the counter bore side) (22a) is positioned approximately at the center of the ball in the axial direction, and the lower end surface (the end surface on the side opposite to the shoulder) of the inner ring (21) That is, the counterbore side end surface (21a) is positioned below the upper end surface (22a) of the outer ring (22) in the axial direction.
[0021]
The solid lubricant (24) is a mixture of high-density polyethylene and oil heated to solidify, and the outer part (29) covering the outer part of the upper half of the ball (23), and the ball (23) And an inner part (30) covering the inner part of the lower half of the first half.
[0022]
The outer portion (29) of the solid lubricant (24) includes an annular contact surface (29a) having an arcuate cross section that contacts the ball (23), and an annular lower surface extending radially outward from the lower end of the contact surface (29a) ( 29b), a cylindrical inner surface (29c) extending upward from the upper end of the contact surface (29a), a cylindrical outer surface (29d) extending upward from the outer end of the lower surface (29b), and a radial direction from the upper end of the inner surface (29c) It has an annular upper surface (29e) extending outward, and an annular recess (29f) formed over the outer surface (29d) and the upper surface (29e). The lower surface (29b) of the outer portion (29) is an outer ring end guide portion facing the upper end surface (22a) of the outer ring (22) with a slight gap, and the inner surface (29c) of the outer portion (29). The inner ring shoulder guide portion is opposed to the outer peripheral surface of the shoulder portion (26) of the inner ring (21) with a slight gap. Further, the outer surface (29d) of the outer portion (29) is a pipe-side seal portion facing the inner peripheral surface of the head pipe (3) with a slight gap. The upper surface (29e) of the outer portion (29) is positioned below the upper end surface of the inner ring (21) with a predetermined gap.
[0023]
The inner part (30) of the solid lubricant (24) includes an annular contact surface (30a) having an arcuate cross section that contacts the ball (23) and a cylindrical outer surface (30b) extending downward from the lower end of the contact surface (30a). And a cylindrical inner surface (30c) extending downward from the upper end of the contact surface (30a), and an annular lower surface (30d) connecting the lower ends of the outer surface (30b) and the inner surface (30c). The outer surface (30b) of the inner portion (30) is an outer ring shoulder guide portion facing the inner peripheral surface of the shoulder portion (28) of the outer ring (22) with a slight gap. Further, the inner surface (30) has an inner surface (30c) having a diameter larger than the outer diameter of the counter bore of the inner ring (21), and the lower surface (30d) of the inner section (30) is smaller than the lower end surface of the outer ring (22). It is located below.
[0024]
In order to manufacture this oblique contact ball bearing, a mold shown in FIG. 4 is used. FIG. 4 is for obtaining the solid lubricant (14) of the oblique contact ball bearing (5) shown in FIG. 2, and the top and bottom thereof are drawn corresponding to the top and bottom of FIG. 2 for convenience. This mold comprises an upper mold (31) having a solid lubricant injection hole (32) and a lower mold (33) (34) (35) divided into three parts. A recess (36) serving as the outer portion (19) of (14) is formed, and the recess (37) serving as the inner portion (20) of the solid lubricant (14) is a lower surface defining the outer surface (37a). It is formed by an outer part (33) of the mold, an intermediate part (34) of the lower mold that defines the lower surface (37b), and an inner part (35) of the lower mold that defines the inner surface (37c). A mixture of high-density polyethylene and oil was injected from the solid lubricant injection hole (32) with the ball (13) held by the upper mold (31) and the lower mold (33) (34) (35). Thereafter, by heating and further cooling, the mixture is solidified to become a lubricant. The oblique contact ball bearing (5) can be obtained by incorporating the ball (13) and the solid lubricant (14) obtained in this way between the inner and outer rings (11) and (12).
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view showing a steering part of a two-wheeled vehicle which is an example in which an oblique contact ball bearing according to the present invention is used.
FIG. 2 is a longitudinal sectional view showing a first embodiment of the oblique contact ball bearing according to the present invention.
FIG. 3 is a longitudinal sectional view showing a second embodiment of the oblique contact ball bearing according to the present invention.
FIG. 4 is a longitudinal sectional view showing a part of the manufacturing process of the oblique contact ball bearing according to the present invention.
[Explanation of symbols]
(4) (5) Angle contact ball bearing
(11) (21) Inner ring
(12) (22) Outer ring
(13) (23) ball
(14) (24) Solid lubricant
(15) (25) Track groove
(16) (26) Shoulder
(17) (27) Track groove
(18) (28) Shoulder
(19) (29) Outer part
(19b) (29b) Bottom surface (edge guide)
(19c) (29c) Inner surface (shoulder guide)
(20) (30) Inside part
(20b) (30b) External surface (shoulder guide)
(20c) Bottom surface (edge guide)

Claims (1)

軌道溝およびこれに連なる肩部を有する内輪と、軌道溝およびこれに連なる肩部を有する外輪と、両輪間に配置されたと、の周りの内外輪間の間隙に封入された固形潤滑材とを備えている斜接玉軸受であって
内輪の反肩部側の端面は、外輪の肩部側端面よりも軸方向内方に位置させられ、外輪の反肩部側の端面は、内輪の肩部側端面よりも軸方向内方に位置させられており、
固形潤滑材は、外輪の反肩部側に配置されて玉の外側部分を覆う外側部と、内輪の反肩部側に配置されて玉の内側部分を覆う内側部とを有し、外側部に、内輪の肩部の外周に対向する内輪肩ガイド部が設けられ、内側部に、外輪の肩部の内周に対向する外輪肩ガイド部が設けられ、外側部および内側部の少なくとも一方に、内外輪の反肩部側の端面に対向する端ガイド部が設けられていることを特徴とする斜接玉軸受。
Solid lubrication sealed in a gap between an inner ring having a raceway groove and a shoulder connected thereto, an outer ring having a raceway groove and a shoulder connected thereto, a ball disposed between both wheels, and the inner and outer rings around the ball a angular contact ball bearings and a timber,
The end surface on the side opposite to the shoulder of the inner ring is positioned axially inward from the end surface on the shoulder side of the outer ring, and the end surface on the side opposite to the shoulder of the outer ring is axially inward from the end surface on the shoulder side of the inner ring. Is located,
The solid lubricant has an outer part that is disposed on the opposite shoulder side of the outer ring and covers the outer part of the ball, and an inner part that is disposed on the opposite shoulder side of the inner ring and covers the inner part of the ball. An inner ring shoulder guide portion that is opposed to the outer periphery of the shoulder portion of the inner ring, and an outer ring shoulder guide portion that is opposed to the inner periphery of the shoulder portion of the outer ring is provided on the inner side portion, and at least one of the outer side portion and the inner side portion is provided. An oblique contact ball bearing, characterized in that an end guide portion is provided opposite to the end surface of the inner and outer rings on the opposite shoulder side .
JP2003026568A 2003-02-04 2003-02-04 Oblique contact ball bearing Expired - Fee Related JP4207589B2 (en)

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