JP3892213B2 - 4-point contact ball bearing - Google Patents

4-point contact ball bearing Download PDF

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Publication number
JP3892213B2
JP3892213B2 JP2000204977A JP2000204977A JP3892213B2 JP 3892213 B2 JP3892213 B2 JP 3892213B2 JP 2000204977 A JP2000204977 A JP 2000204977A JP 2000204977 A JP2000204977 A JP 2000204977A JP 3892213 B2 JP3892213 B2 JP 3892213B2
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Japan
Prior art keywords
raceway surface
bearing
ring raceway
ball
point contact
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Expired - Fee Related
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JP2000204977A
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JP2002021855A (en
Inventor
義崇 中川
孝 岩田
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JTEKT Corp
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JTEKT Corp
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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
    • 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
    • F16C19/16—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 a single row of balls
    • F16C19/163—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 a single row of balls with angular contact
    • F16C19/166—Four-point-contact ball bearings
    • 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
    • F16C33/583—Details of specific parts of races
    • F16C33/585—Details of specific parts of races of raceways, e.g. ribs to guide the rollers
    • 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
    • F16C2240/00—Specified values or numerical ranges of parameters; Relations between them
    • F16C2240/40—Linear dimensions, e.g. length, radius, thickness, gap
    • F16C2240/70—Diameters; Radii
    • F16C2240/76—Osculation, i.e. relation between radii of balls and raceway groove

Description

【０００１】
【発明の属する技術分野】
本発明は４点接触玉軸受に関する。
【０００２】
【従来の技術】
従来、４点接触玉軸受は、内外輪の軌道溝を構成する曲面の曲率、および、その曲面とボールとの接触角を、軸受中心を境界にして対称にしている。
【０００３】
上記構成の４点接触玉軸受によれば、ラジアル方向のいわゆる純ラジアル荷重以外の外部荷重が加わるとボールは軌道溝上で転がり運動をしながら横方向に回転するスピン運動をする。このスピン運動によって、内輪と外輪との間に充填された潤滑剤が、軌道溝とボールとの間に引っ張り込まれて、軌道溝とボールとの接触部を潤滑する。
【０００４】
【発明が解決しようとする課題】
ところで、上記４点接触玉軸受では、純ラジアル荷重を受けた場合、または、モーメント荷重が小さい場合、ボールは転がり運動のみし、スピン運動しないために、軌道溝とボールとの接触部にグリースが供給されず、部分的にグリースの供給不良が生じて、早期の焼付に到ってしまうという問題がある。
【０００５】
そこで、本発明の目的は、純ラジアル荷重だけが働いた場合でもボールにスピン運動を常に起こして、潤滑不良を防止できる４点接触玉軸受を提供することにある。
【０００６】
【課題を解決するための手段】
上記目的を達成するため、請求項１の発明の４点接触玉軸受は、ボールが内輪軌道面に２点で接触すると共に、外輪軌道面に２点で接触する４点接触玉軸受であって、上記内輪軌道面および外輪軌道面において、軸受中心に関して、軸方向両側の軌道面の曲率半径が異なり、上記内輪軌道面の上記軸方向一方側の上記軌道面と、上記内輪軌道面の上記軸方向他方側の上記軌道面と、上記外輪軌道面の上記軸方向一方側の上記軌道面と、上記外輪軌道面の上記軸方向他方側の上記軌道面とは、曲率半径が互いに異なることを特徴としている。
【０００７】
上記請求項１の発明の４点接触玉軸受によれば、上記軸受中心に関して、軸方向両側の軌道面の曲率半径が異なり、上記軸受中心に関して内輪軌道面の軸方向一方側の軌道面と、軸受中心に関して内輪軌道面の軸方向他方側の軌道面と、軸受中心に関して外輪軌道面の軸方向一方側の軌道面と、軸受中心に関して外輪軌道面の軸方向他方側の軌道面とは、曲率半径が互いに異なるから、接触楕円の大きさが異なる。そのため、純ラジアル荷重のみが働いた場合でも、荷重バランスが崩れ、ボールがスピン運動する。その結果、軸受内部に充填された潤滑剤でボールの接触部が潤滑され、ボール全体が十分に潤滑されて、早期の焼付を防げ、軸受寿命を長くできる。
【０００８】
また、請求項２の発明の４点接触玉軸受は、請求項１に記載の４点接触玉軸受において、上記軸方向両側の上記軌道面は、異なる円弧面であることを特徴としている。
【０００９】
上記請求項２の発明の４点接触玉軸受によれば、上記軸方向両側の軌道面は、異なる円弧面であるから、軌道面の設計が容易になる。
【００１０】
また、請求項３の発明の４点接触玉軸受は、請求項１または２に記載の４点接触玉軸受において、上記内輪軌道面または外輪軌道面の少なくとも一方において、軸受中心に関して、軸方向両側の軌道面とボールとの接触角が互いに異なることを特徴としている。
【００１１】
上記請求項３の発明の４点接触玉軸受によれば、上記軸受中心に関して、軸方向両側の軌道面とボールとの接触角が互いに異なるから、純ラジアル荷重のみが働いた場合でも、荷重バランスが崩れ、ボールがスピン運動する。その結果、軸受内部の潤滑剤でボールの接触部が潤滑され、ボール全体が十分に潤滑されて、早期の焼付を防げ、軸受寿命を延ばせる。
【００１２】
また、請求項４の発明の４点接触玉軸受は、上記軌道面両側の上記軌道面は、上記軸受中心において、滑らかに連なっていることを特徴としている。
【００１３】
上記請求項４の発明の４点接触玉軸受によれば、上記軸方向両側の軌道面は、軸受中心において、滑らかに連なっているから、軸受中心の軌道面上をボールが転がっても、ボールの損傷を防止でき、かつ、その軌道面で生じる剥離を防止できる。
【００１４】
【発明の実施の形態】
以下、本発明の第１,第２の実施の形態の４点接触玉軸受を図１を用いて説明する。この４点接触玉軸受は、図１に示すように、内輪軌道面５が形成された内輪１と、外輪軌道面６が形成された外輪２と、内輪１と外輪２との間に配置された複数のボール３(図１では１つのみ示す)とを備えている。上記ボール３は、内輪軌道面５に２点で接触すると共に、外輪軌道面６に２点で接触している。なお、図示しないが、上記内輪１と外輪２との間にはシールを設けて、内部間に水や埃などが入り込むのを防止し、また、複数のボール３を保持器で周方向に一定間隔をあけて保持している。
【００１５】
(第１の実施の形態)
本発明の第１の実施の形態の４点接触玉軸受によれば、内輪軌道面５は、軸受中心Ｃに関して、軸方向両側の異なる円弧面７,８からなる。また、上記外輪軌道面６も、軸受向中心Ｃに関して、軸方向両側の異なる円弧面９,１０からなっている。つまり、上記円弧面７と円弧面８とは互いに異なる曲率半径を有すると共に、円弧面９と円弧面１０とは互いに異なる曲率半径を有する。すなわち、上記円弧面７,８,９,１０では、ボール３との接触点Ｐ１,Ｐ２において曲率半径は互いに異なり、ボール３との接触点Ｐ３,Ｐ４においても曲率半径は互いに異なっている。
【００１６】
上記構成の４点接触玉軸受によれば、接触点Ｐ１,Ｐ２,Ｐ３,Ｐ４において、曲率半径が異なるから、接触楕円の大きさが異なる。そのため、純ラジアル荷重のみが働いた場合でも、荷重バランスが崩れ、ボール３がスピン運動する。その結果、上記内輪１と外輪２との間に充填された潤滑剤でボール３の接触部が潤滑され、ボール３の全体が十分に潤滑されて、早期の焼付を防げ、軸受寿命を長くできる。
【００１７】
また、上記内輪軌道面５,外輪軌道面６は、軸受中心Ｃに関して、軸方向両側の異なる円弧面７,８,円弧面９,１０であるから、内輪軌道面５,外輪軌道面６の設計が容易である。
【００１８】
上記第１の実施の形態では、接触点Ｐ１,Ｐ２,Ｐ３,Ｐ４において曲率半径は異なっていたが、接触点Ｐ１,Ｐ２の曲率半径が互いに異なっているだけでもよく、または、接触点Ｐ３,Ｐ４の曲率半径が互いに異なっているだけでもよい。要するに、上記内輪軌道面５と外輪軌道面６の少なくとも一方において、接触点Ｐ１,Ｐ２,Ｐ３,Ｐ４の曲率半径が互いに異なっていればよい。
【００１９】
また、上記第１の実施の形態では、内輪軌道面５は異なる円弧面７,８からなり、外輪軌道面６も異なる円弧面９,１０からなっていたが、内輪軌道面５および外輪軌道面６は、断面が異なる楕円、双曲線または放物線からなってもよい。また、上記内輪軌道面５および外輪軌道面６は、断面が１つの楕円、双曲線または放物線であってもよい。
【００２０】
(第２の実施の形態)
本発明の第２の実施の形態の４点接触玉軸受によれば、内輪軌道面５は、軸受中心Ｃに関して、軸方向両側の軌道面７,８とボール３との接触角Ａ１,Ａ２が互いに異なり、また、外輪軌道面６は、軸受中心Ｃに関して、軸方向両側の軌道面９,１０とボール３との接触角Ａ３,Ａ４が互いに異なる。また、上記接触角Ａ１と接触角Ａ４とが等しく、上記接触角Ａ２と接触角Ａ３とが等しくなっている。
【００２１】
上記構成の４点接触玉軸受によれば、接触角Ａ１と接触角Ａ２とが異なり、接触角Ａ３と接触角Ａ４とが異なるから、純ラジアル荷重のみが働いた場合でも、荷重バランスが崩れ、ボール３がスピン運動する。その結果、上記内輪１と外輪２との間に充填された潤滑剤でボール３の接触部が潤滑され、ボール３の全体が十分に潤滑されて、早期の焼付を防げ、軸受寿命を長くできる。
【００２２】
上記第２の実施の形態では、接触角Ａ１と接触角Ａ２とが異なり、かつ、接触角Ａ３と接触角Ａ４とが異なっていたが、接触角Ａ１と接触角Ａ２とが異なるか、または、接触角Ａ３と接触角Ａ４とが異なればよい。要するに、上記内輪軌道面５と外輪軌道面６との少なくとも一方において、２つの接触角Ａ１,Ａ２(Ａ３,Ａ４)が互いに異なっていればよい。
【００２３】
また、上記第２の実施の形態でも、第１の実施の形態と同様に、内輪軌道面５および外輪軌道面６は、断面が異なる楕円、双曲線または放物線、または、１つの楕円、双曲線または放物線であってもよい。言うまでもないが、内輪軌道面５は、軸受中心Ｃに関して、軸方向両側の異なる円弧面７,８からなってもよいし、外輪軌道面６も、軸受中心Ｃに関して、軸方向両側の異なる円弧面９,１０からなってもよい。
【００２４】
また、例えば、上記円弧面７の曲率半径をボール径の５２．５％、円弧面８の曲率半径をボール径の５２％、円弧面９の曲率半径をボール径の５４．５％、円弧面１０の曲率半径をボール径の５５．５％、接触角Ａ１と接触角Ａ４を２３°、接触角Ａ２と接触角Ａ３を２５．５°に設定すれば、軸方向両側の円弧面７,８,９,１０は、軸受中心Ｃにおいて、滑らかに連なっている。その結果、上記軸受中心Ｃの内輪軌道面５,外輪軌道面６上をボール３が転がっても、ボール３が損傷せず、かつ、その内輪軌道面５,外輪軌道面６で剥離も発生しない。
【００２５】
【発明の効果】
以上より明らかなように、請求項１の発明の４点接触玉軸受は、軸受中心に関して、軸方向両側の軌道面におけるボールとの接触点において、曲率半径が異なり、上記内輪軌道面の上記軸方向一方側の上記軌道面と、上記内輪軌道面の上記軸方向他方側の上記軌道面と、上記外輪軌道面の上記軸方向一方側の上記軌道面と、上記外輪軌道面の上記軸方向他方側の上記軌道面とは、曲率半径が互いに異なるから、接触楕円の大きさが異なり、荷重バランスが崩れ、ボールがスピン運動する。その結果、軸受内部の潤滑剤でボールの接触部が潤滑され、ボール全体が十分に潤滑されて、早期の焼付を防げ、軸受寿命を長くできる。
【００２６】
請求項２の発明の４点接触玉軸受は、上記軸方向両側の軌道面は、異なる円弧面であるから、軌道面の設計が容易になる。
【００２７】
請求項３の発明の４点接触玉軸受は、軸受中心に関して、軸方向両側の軌道面とボールとの接触角が互いに異なるから、純ラジアル荷重のみが働いた場合でも、荷重バランスが崩れ、ボールがスピン運動し、ボール全体が潤滑剤で十分に潤滑されて、早期の焼付を防げ、軸受寿命を延ばせる。
【００２８】
請求項４の発明の４点接触玉軸受は、上記軸方向両側の軌道面は、軸受中心において、滑らかに連なっているから、軸受中心の軌道面上をボールが転がっても、ボールの損傷を防止でき、かつ、その軌道面で生じる剥離を防止できる。
【図面の簡単な説明】
【図１】 図１は本発明の第１,第２の実施の形態の４点接触玉軸受の要部の概略断面図である。
【符号の説明】
１ 内輪
２ 外輪
３ ボール
５ 内輪軌道面
６ 外輪軌道面
７,８,９,１０ 円弧面
Ａ１,Ａ２,Ａ３,Ａ４ 接触角
Ｃ 軸受中心
Ｐ１,Ｐ２,Ｐ３,Ｐ４ 接触点[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a four-point contact ball bearing.
[0002]
[Prior art]
Conventionally, in the four-point contact ball bearing, the curvature of the curved surface constituting the raceway groove of the inner and outer rings and the contact angle between the curved surface and the ball are made symmetric with respect to the bearing center.
[0003]
According to the four-point contact ball bearing configured as described above, when an external load other than a so-called pure radial load in the radial direction is applied, the ball performs a spin motion that rotates in the lateral direction while rolling on the raceway groove. By this spin motion, the lubricant filled between the inner ring and the outer ring is pulled between the raceway groove and the ball, and lubricates the contact portion between the raceway groove and the ball.
[0004]
[Problems to be solved by the invention]
By the way, in the above four-point contact ball bearing, when a pure radial load is applied, or when the moment load is small, the ball only rolls and does not spin, so that grease is applied to the contact portion between the raceway groove and the ball. There is a problem that the grease is not supplied and a supply failure of the grease partially occurs, leading to early seizure.
[0005]
SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a four-point contact ball bearing that can always cause a spin motion in a ball even when only a pure radial load is applied, thereby preventing poor lubrication.
[0006]
[Means for Solving the Problems]
In order to achieve the above object, the four-point contact ball bearing of the invention of claim 1 is a four-point contact ball bearing in which the ball contacts the inner ring raceway surface at two points and contacts the outer ring raceway surface at two points. In the inner ring raceway surface and the outer ring raceway surface, the radius of curvature of the raceway surfaces on both axial sides differs with respect to the bearing center, the raceway surface on the one axial side of the inner ring raceway surface, and the axis of the inner ring raceway surface. and the raceway surface of the direction other side, and the axial direction one side of the raceway surface of the outer ring raceway surface, and the axial direction other side of the raceway surface of the outer ring raceway surface, that the radii of curvature are different from each other It is a feature.
[0007]
According to the four-point contact ball bearing of the first aspect of the invention, with respect to the bearing center, the radius of curvature of the raceway surfaces on both sides in the axial direction is different, and the raceway surface on one axial side of the inner ring raceway surface with respect to the bearing center; and the other axial side of the raceway surface of the inner ring raceway surface with respect to the bearing center, and the raceway surface of the one axial side of the outer ring raceway surface with respect to the bearing center, and the other axial side of the raceway surface of the outer ring raceway surface with respect to the bearing center, songs Since the radius of radii are different from each other, the size of the contact ellipse is different. Therefore, even when only a pure radial load is applied, the load balance is lost and the ball spins. As a result, the contact portion of the ball is lubricated with the lubricant filled in the bearing, and the entire ball is sufficiently lubricated to prevent premature seizure and extend the life of the bearing.
[0008]
A four-point contact ball bearing according to a second aspect of the invention is the four-point contact ball bearing according to the first aspect, wherein the raceway surfaces on both sides in the axial direction are different circular arc surfaces.
[0009]
According to the four-point contact ball bearing of the second aspect of the present invention, the raceway surfaces on both sides in the axial direction are different arc surfaces, so that the design of the raceway surface becomes easy.
[0010]
A four-point contact ball bearing according to a third aspect of the invention is the four-point contact ball bearing according to the first or second aspect, wherein at least one of the inner ring raceway surface and the outer ring raceway surface is provided on both axial sides with respect to the bearing center. The contact angle between the raceway surface and the ball is different from each other.
[0011]
According to the four-point contact ball bearing of the invention of claim 3 above, the contact angle between the raceway surface on both axial sides and the ball is different from each other with respect to the center of the bearing, so that even when only a pure radial load is applied, the load balance Collapses and the ball spins. As a result, the contact portion of the ball is lubricated by the lubricant inside the bearing, and the entire ball is sufficiently lubricated to prevent premature seizure and extend the bearing life.
[0012]
The four-point contact ball bearing according to the invention of claim 4 is characterized in that the raceway surfaces on both sides of the raceway surface are smoothly connected at the center of the bearing.
[0013]
According to the four-point contact ball bearing of the invention of claim 4, the raceway surfaces on both axial sides are smoothly connected at the center of the bearing, so that even if the ball rolls on the raceway surface of the bearing center, Can be prevented, and peeling that occurs on the raceway surface can be prevented.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the four-point contact ball bearing of the first and second embodiments of the present invention will be described with reference to FIG. As shown in FIG. 1, the four-point contact ball bearing is disposed between an inner ring 1 having an inner ring raceway surface 5, an outer ring 2 having an outer ring raceway surface 6, and an inner ring 1 and an outer ring 2. And a plurality of balls 3 (only one is shown in FIG. 1). The ball 3 is in contact with the inner ring raceway surface 5 at two points and is in contact with the outer ring raceway surface 6 at two points. Although not shown, a seal is provided between the inner ring 1 and the outer ring 2 to prevent water and dust from entering between the insides, and the plurality of balls 3 are fixed in the circumferential direction by a cage. Hold at intervals.
[0015]
(First embodiment)
According to the four-point contact ball bearing of the first embodiment of the present invention, the inner ring raceway surface 5 is composed of different circular arc surfaces 7 and 8 on both sides in the axial direction with respect to the bearing center C. The outer ring raceway surface 6 is also composed of different arcuate surfaces 9 and 10 on both sides in the axial direction with respect to the bearing center C. That is, the circular arc surface 7 and the circular arc surface 8 have different radii of curvature, and the circular arc surface 9 and the circular arc surface 10 have different radii of curvature. That is, in the circular arc surfaces 7, 8, 9, and 10, the radii of curvature are different from each other at the contact points P1 and P2 with the ball 3, and the radii of curvature are also different from each other at the contact points P3 and P4 with the ball 3.
[0016]
According to the four-point contact ball bearing having the above-described configuration, the radius of curvature is different at the contact points P1, P2, P3, and P4, and therefore the size of the contact ellipse is different. Therefore, even when only a pure radial load is applied, the load balance is lost, and the ball 3 spins. As a result, the contact portion of the ball 3 is lubricated with the lubricant filled between the inner ring 1 and the outer ring 2, and the entire ball 3 is sufficiently lubricated to prevent premature seizure and extend the bearing life. .
[0017]
Further, since the inner ring raceway surface 5 and the outer ring raceway surface 6 are different arc surfaces 7, 8 and arc surfaces 9, 10 on both sides in the axial direction with respect to the bearing center C, the inner ring raceway surface 5 and the outer ring raceway surface 6 are designed. Is easy.
[0018]
In the first embodiment, the curvature radii are different at the contact points P1, P2, P3, and P4. However, the curvature radii of the contact points P1 and P2 may be different from each other, or the contact points P3, P2, The curvature radii of P4 may be different from each other. In short, it is only necessary that at least one of the inner ring raceway surface 5 and the outer ring raceway surface 6 have different curvature radii at the contact points P1, P2, P3, and P4.
[0019]
In the first embodiment, the inner ring raceway surface 5 is composed of different arc surfaces 7 and 8, and the outer ring raceway surface 6 is also composed of different arc surfaces 9 and 10. However, the inner ring raceway surface 5 and the outer ring raceway surface are the same. 6 may consist of an ellipse, hyperbola or parabola with different cross sections. Further, the inner ring raceway surface 5 and the outer ring raceway surface 6 may be an ellipse, a hyperbola, or a parabola having a cross section.
[0020]
(Second embodiment)
According to the four-point contact ball bearing of the second embodiment of the present invention, the inner ring raceway surface 5 has contact angles A1 and A2 between the raceways 7 and 8 on both sides in the axial direction and the balls 3 with respect to the bearing center C. The outer ring raceway surfaces 6 are different from each other in contact angles A3 and A4 between the raceways 9 and 10 on both sides in the axial direction and the balls 3 with respect to the bearing center C. Further, the contact angle A1 and the contact angle A4 are equal, and the contact angle A2 and the contact angle A3 are equal.
[0021]
According to the four-point contact ball bearing configured as described above, the contact angle A1 is different from the contact angle A2, and the contact angle A3 is different from the contact angle A4. Therefore, even when only a pure radial load is applied, the load balance is lost. The ball 3 spins. As a result, the contact portion of the ball 3 is lubricated with the lubricant filled between the inner ring 1 and the outer ring 2, and the entire ball 3 is sufficiently lubricated to prevent premature seizure and extend the bearing life. .
[0022]
In the second embodiment, the contact angle A1 is different from the contact angle A2, and the contact angle A3 is different from the contact angle A4. However, the contact angle A1 is different from the contact angle A2, or It is sufficient that the contact angle A3 and the contact angle A4 are different. In short, it is only necessary that at least one of the inner ring raceway surface 5 and the outer ring raceway surface 6 has two contact angles A1, A2 (A3, A4) different from each other.
[0023]
Also in the second embodiment, as in the first embodiment, the inner ring raceway surface 5 and the outer ring raceway surface 6 have an ellipse, a hyperbola, or a parabola with different cross sections, or one ellipse, hyperbola, or parabola. It may be. Needless to say, the inner ring raceway surface 5 may be composed of different arcuate surfaces 7 and 8 on both sides in the axial direction with respect to the bearing center C, and the outer ring raceway surface 6 may also be different arcuate surfaces on both sides in the axial direction with respect to the bearing center C. It may consist of 9,10.
[0024]
Further, for example, the radius of curvature of the arc surface 7 is 52.5% of the ball diameter, the radius of curvature of the arc surface 8 is 52% of the ball diameter, the radius of curvature of the arc surface 9 is 54.5% of the ball diameter, and the arc surface If the radius of curvature of 10 is set to 55.5% of the ball diameter, the contact angle A1 and the contact angle A4 are set to 23 °, and the contact angle A2 and the contact angle A3 are set to 25.5 °, the circular arc surfaces 7, 8 on both sides in the axial direction , 9, 10 are connected smoothly at the bearing center C. As a result, even if the ball 3 rolls on the inner ring raceway surface 5 and the outer ring raceway surface 6 of the bearing center C, the ball 3 is not damaged, and the inner ring raceway surface 5 and the outer ring raceway surface 6 are not separated. .
[0025]
【The invention's effect】
As is clear from the above, the four-point contact ball bearing of the invention of claim 1 has different radii of curvature at the contact points with the balls on the raceway surfaces on both sides in the axial direction with respect to the bearing center, and the shaft of the inner ring raceway surface. The raceway surface on one side in the direction, the raceway surface on the other axial side of the inner ring raceway surface, the raceway surface on the one axial side of the outer ring raceway surface, and the other axial direction of the outer ring raceway surface. the above raceway surface side, since the radius of curvature are different from each other, different sizes of the contact ellipse, unbalances the load, the ball is spinning motion. As a result, the contact portion of the ball is lubricated by the lubricant inside the bearing, and the entire ball is sufficiently lubricated to prevent premature seizure and extend the bearing life.
[0026]
In the four-point contact ball bearing according to the second aspect of the invention, the raceway surfaces on both sides in the axial direction are different circular arc surfaces, so that the raceway surface can be easily designed.
[0027]
In the four-point contact ball bearing of the invention of claim 3, the contact angle between the raceway surface on both sides in the axial direction and the ball is different from each other with respect to the bearing center, so even when only a pure radial load is applied, the load balance is lost. Spins and the entire ball is sufficiently lubricated with a lubricant to prevent premature seizure and extend bearing life.
[0028]
In the four-point contact ball bearing of the invention of claim 4, the raceway surfaces on both axial sides are smoothly connected at the center of the bearing. Therefore, even if the ball rolls on the raceway surface of the bearing center, the ball is damaged. It is possible to prevent the peeling that occurs on the raceway surface.
[Brief description of the drawings]
FIG. 1 is a schematic cross-sectional view of a main part of a four-point contact ball bearing according to first and second embodiments of the present invention.
[Explanation of symbols]
1 Inner ring 2 Outer ring 3 Ball 5 Inner ring raceway surface 6 Outer ring raceway surface 7, 8, 9, 10 Arc surface A1, A2, A3, A4 Contact angle C Bearing center P1, P2, P3, P4 Contact point

Claims (4)

ボールが内輪軌道面に２点で接触すると共に、外輪軌道面に２点で接触する４点接触玉軸受であって、
上記内輪軌道面および外輪軌道面において、軸受中心に関して、軸方向両側の軌道面の曲率半径が異なり、
上記軸受中心に関して上記内輪軌道面の軸方向一方側の軌道面と、上記軸受中心に関して上記内輪軌道面の軸方向他方側の軌道面と、上記軸受中心に関して上記外輪軌道面の軸方向一方側の軌道面と、上記軸受中心に関して上記外輪軌道面の軸方向他方側の軌道面とは、曲率半径が互いに異なることを特徴とする４点接触玉軸受。A four-point contact ball bearing in which the ball contacts the inner ring raceway surface at two points and contacts the outer ring raceway surface at two points,
In the inner ring raceway surface and the outer ring raceway surface, the radius of curvature of the raceway surfaces on both axial sides differs with respect to the bearing center.
The raceway surface on one axial side of the inner ring raceway surface with respect to the bearing center, the raceway surface on the other axial side of the inner ring raceway surface with respect to the bearing center, and the axially one side of the outer ring raceway surface with respect to the bearing center. A four-point contact ball bearing , wherein the raceway surface and the raceway surface on the other axial side of the outer ring raceway surface with respect to the bearing center have different radii of curvature. 請求項１に記載の４点接触玉軸受において、
上記軸方向両側の上記軌道面は、異なる円弧面であることを特徴とする４点接触玉軸受。The four-point contact ball bearing according to claim 1,
The four-point contact ball bearing, wherein the raceway surfaces on both sides in the axial direction are different circular arc surfaces. 請求項１または２に記載の４点接触玉軸受において、
上記内輪軌道面または外輪軌道面の少なくとも一方において、軸受中心に関して、軸方向両側の軌道面とボールとの接触角が互いに異なることを特徴とする４点接触玉軸受。The four-point contact ball bearing according to claim 1 or 2,
A four-point contact ball bearing, wherein at least one of the inner ring raceway surface and the outer ring raceway surface has different contact angles between the raceway surfaces on both axial sides and the ball with respect to the bearing center. 請求項１乃至３のいずれか１つに記載の４点接触玉軸受において、
上記軸方向両側の上記軌道面は、上記軸受中心において、滑らかに連なっていることを特徴とする４点接触玉軸受。In the four-point contact ball bearing according to any one of claims 1 to 3,
The four-point contact ball bearing, wherein the raceway surfaces on both sides in the axial direction are smoothly continuous at the center of the bearing.
JP2000204977A 2000-07-06 2000-07-06 4-point contact ball bearing Expired - Fee Related JP3892213B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2000204977A JP3892213B2 (en) 2000-07-06 2000-07-06 4-point contact ball bearing

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2000204977A JP3892213B2 (en) 2000-07-06 2000-07-06 4-point contact ball bearing

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JP3892213B2 true JP3892213B2 (en) 2007-03-14

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Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6827496B2 (en) * 2001-08-28 2004-12-07 Koyo Seiko Co., Ltd. Four-point contact ball bearing
CN103527625A (en) * 2013-10-31 2014-01-22 大连交通大学 Integrated ferrule four-point contact ball bearing
JP6561539B2 (en) * 2015-04-01 2019-08-21 日本精工株式会社 Single row ball bearing
CN111120520A (en) * 2019-12-23 2020-05-08 宁波市海曙凯大机械有限公司 Ball bearing raceway with heart-shaped curvature
CN114087283A (en) * 2021-11-29 2022-02-25 中国航发哈尔滨轴承有限公司 Double-half inner ring angular contact ball bearing with radial load larger than axial load

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