JP2011112084A - Ball bearing - Google Patents

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JP2011112084A
JP2011112084A JP2009266611A JP2009266611A JP2011112084A JP 2011112084 A JP2011112084 A JP 2011112084A JP 2009266611 A JP2009266611 A JP 2009266611A JP 2009266611 A JP2009266611 A JP 2009266611A JP 2011112084 A JP2011112084 A JP 2011112084A
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Prior art keywords
ball
ball bearing
width direction
raceway
arc
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Tomonari Nishiyama
知成 西山
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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
    • 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
    • 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
    • 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

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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 compact ball bearing including a load capacity capable of withstanding a higher load. <P>SOLUTION: A raceway in the case of viewing a raceway ring in a cross section of a plane including a center axis of a ball bearing includes: an outer part Ao; a central part Ac; and an inner part Ai. The central part Ac is in a central part in the cross direction of the raceway ring, and formed of an arc. The outer part Ao is outside of the central part Ac in the cross direction, and formed of a smooth line increasing a gap G between a ball 3 as it comes more outside in the cross direction so as to form a logarithmic crowning curve relative to an outer circumferential circle of the ball 3. The inner part Ai is formed of a smooth line increasing the gap G between the ball 3 as it comes more inside in the cross direction so as to form a logarithmic crowning curve relative to the outer circumferential circle of the ball 3. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

本発明は、玉軸受に関し、特に、内外輪の軌道の形状に関する。   The present invention relates to a ball bearing, and more particularly to the shape of a raceway for inner and outer rings.

図６は、従来の玉軸受の一部を示す断面図である。図において、内輪１０１及び外輪１０２の間には転動体としての玉１０３が設けられている。玉１０３は、内輪１０１の軌道１０１ａ上、及び、外輪１０２の軌道１０２ａ上を、転動する。玉１０３の円滑な転動を妨げないように、軌道の１０１ａ，１０２ａの曲率半径は、玉１０３の半径よりも大きく作られている（例えば、特許文献１参照。）。   FIG. 6 is a cross-sectional view showing a part of a conventional ball bearing. In the figure, a ball 103 as a rolling element is provided between an inner ring 101 and an outer ring 102. The ball 103 rolls on the track 101 a of the inner ring 101 and on the track 102 a of the outer ring 102. The radius of curvature of the trajectories 101a and 102a is made larger than the radius of the ball 103 so as not to hinder the smooth rolling of the ball 103 (see, for example, Patent Document 1).

内輪１０１及び外輪１０２の一方が他方に対して回転するとき、玉１０３は、転がりながら周方向に移動する。玉１０３と例えば内輪１０１の軌道１０１ａとは、図の断面で言えば、点接触の状態となる。但し、現実には点ではなく、若干の拡がりを持つ接触楕円となるが、その面積は非常に小さい。従って、玉１０３の接触荷重による圧力分布は、例えば図中の縦縞線で示すように、一点集中的な形状となり、中央にピークが発生する。   When one of the inner ring 101 and the outer ring 102 rotates with respect to the other, the ball 103 moves in the circumferential direction while rolling. The ball 103 and the track 101a of the inner ring 101, for example, are in a point contact state in the cross section of the figure. However, in reality, it is not a point but a contact ellipse having a slight spread, but its area is very small. Therefore, the pressure distribution due to the contact load of the ball 103 has a one-point concentration shape as shown by vertical stripes in the figure, for example, and a peak is generated at the center.

特開２００１−２０８０８０号公報Japanese Patent Laid-Open No. 2001-208080

近年、ハイブリッド車の普及や電気自動車の開発で、ころ軸受よりも低回転トルクな玉軸受の需要が高まっている。しかし、高荷重で使用されるスラストころ軸受の代わりに上記のような玉軸受を使用すると、一点集中的な圧力分布により、衝撃荷重に対して軌道１０１ａ，１０２ａに圧痕が付き易い。この弱点は、より高い荷重にも耐え得る負荷容量を備えた玉軸受を選定することにより克服できるが、かかる玉軸受はサイズが大きくなるので、小型軽量化の要請に反する。すなわち、玉軸受のサイズを大きくすることなく、圧痕が付き易いという弱点を如何にして解消するか、という課題がある。
そこで、本発明は、コンパクトで、より高い荷重にも耐え得る負荷容量を備えた玉軸受を提供することを目的とする。 In recent years, with the spread of hybrid vehicles and the development of electric vehicles, the demand for ball bearings with lower rotational torque than roller bearings has increased. However, when a ball bearing such as that described above is used instead of a thrust roller bearing that is used with a high load, the tracks 101a and 102a are likely to be indented with respect to an impact load due to a one-point concentrated pressure distribution. This weak point can be overcome by selecting a ball bearing having a load capacity capable of withstanding a higher load, but such a ball bearing is increased in size, which is contrary to the demand for reduction in size and weight. That is, there is a problem of how to solve the weak point that an indentation is easily formed without increasing the size of the ball bearing.
Accordingly, an object of the present invention is to provide a ball bearing that is compact and has a load capacity that can withstand a higher load.

本発明の玉軸受は、中心軸を含む平面の断面で軌道輪を見た場合の軌道が、（ａ）前記軌道輪の幅方向への中央にあって、円弧で形成された中央部と、（ｂ）前記中央部の幅方向外方にあって、玉の外周円に対して相対的に対数クラウニング曲線となるように、幅方向外方ほど当該玉との隙間が増加する滑らかな線で形成された外方部と、（ｃ）前記中央部の幅方向内方にあって、前記玉の外周円に対して相対的に対数クラウニング曲線となるように、幅方向内方ほど前記玉との隙間が増加する滑らかな線で形成された内方部と、によって構成されるものである。   In the ball bearing of the present invention, the raceway when the raceway is viewed in a cross section of a plane including the central axis is (a) the center in the width direction of the raceway, and a center portion formed by an arc; (B) A smooth line that is outward in the width direction of the central portion and has a gap that increases toward the outer side in the width direction so as to be a logarithmic crowning curve relative to the outer circumference of the ball. The outer part formed, and (c) the inner part in the width direction of the center part, and the ball inward in the width direction so as to have a logarithmic crowning curve relative to the outer circumference of the ball. And an inner part formed by a smooth line in which the gap increases.

上記のような玉軸受では、外方部及び内方部の各々と玉との隙間が対数クラウニング曲線を成すことにより、軌道に対する玉の接触圧力を均一に分布させることができる。また、中央部は円弧とすることで、中央部と外方部又は内方部とを、互いに滑らかに、かつ、容易に繋ぐことができる。   In the ball bearing as described above, the contact pressure of the ball with respect to the raceway can be uniformly distributed by forming a logarithmic crowning curve between the outer part and the inner part and the ball. In addition, by making the central portion an arc, the central portion and the outer portion or the inner portion can be smoothly and easily connected to each other.

また、上記玉軸受において、中央部の円弧の曲率半径は、玉の半径と同一であることが好ましい。
この場合、軌道輪の断面で見た玉は、中央部と点接触ではなく円弧に沿って線接触することになるので、接触圧力の集中を緩和することができる。 In the ball bearing, the radius of curvature of the arc at the center is preferably the same as the radius of the ball.
In this case, since the ball viewed in the cross section of the raceway is in line contact with the central portion along the arc instead of point contact, concentration of contact pressure can be reduced.

また、上記玉軸受において、滑らかな線は、円弧又は直線によって近似的に構成されるものであってもよい。
この場合、対数クラウニングに基づく曲線を、円弧又は直線の近似によって容易に作製することができる。 In the ball bearing, the smooth line may be approximately constituted by an arc or a straight line.
In this case, a curve based on logarithmic crowning can be easily created by approximation of an arc or a straight line.

本発明の玉軸受によれば、サイズを大きくせずに、回転トルクを低減し、より高い荷重にも耐え得る負荷容量を備えることができる。このことは、逆に言えば、負荷容量が従来と同じでよい場合には、従来よりもサイズダウンして、より小型軽量化できる、ということになる。   According to the ball bearing of the present invention, it is possible to provide a load capacity capable of reducing rotational torque and withstanding a higher load without increasing the size. In other words, if the load capacity may be the same as the conventional one, the size can be reduced more than the conventional one and the size and weight can be reduced.

本発明の一実施形態に係る玉軸受の一部を示す断面図である。It is sectional drawing which shows a part of ball bearing which concerns on one Embodiment of this invention. 図１における軌道の詳細を示す断面図である。It is sectional drawing which shows the detail of the track | orbit in FIG. 対数クラウニング曲線の一例を示すグラフである。It is a graph which shows an example of a logarithmic crowning curve. （ａ）は、ｘ＝０を中心とした左右対称の対数クラウニング曲線を示すグラフである。（ｂ）は、玉の曲線及び軌道の曲線を示すグラフである。（ｃ）は、軌道のクラウニング量を示すグラフである。(A) is a graph showing a symmetrical logarithmic crowning curve centered on x = 0. (B) is a graph showing a ball curve and a trajectory curve. (C) is a graph which shows the crowning amount of an orbit. 圧力分布を示す図である。It is a figure which shows pressure distribution. 従来の玉軸受の一部を示す断面図である。It is sectional drawing which shows a part of conventional ball bearing.

図１は、本発明の一実施形態に係る玉軸受の一部を示す断面図である。
図において、内輪１及び外輪２の間には転動体としての玉３が設けられている。内輪１及び外輪２の一方が他方に対して回転するとき、玉３は、内輪１の軌道１ａ上、及び、外輪２の軌道２ａ上を、周方向に転動する。 FIG. 1 is a cross-sectional view showing a part of a ball bearing according to an embodiment of the present invention.
In the figure, a ball 3 as a rolling element is provided between an inner ring 1 and an outer ring 2. When one of the inner ring 1 and the outer ring 2 rotates with respect to the other, the balls 3 roll on the track 1a of the inner ring 1 and the track 2a of the outer ring 2 in the circumferential direction.

図２は、図１における軌道１ａ，２ａの詳細を示す断面図である。図において、玉軸受の中心軸（図示せず。）を含む平面の断面（すなわち図示の断面）で軌道輪（内輪１，外輪２）を見た場合の例えば軌道１ａは、図の右方を「外」、左方を「内」とすると、外方部Ａｏ、中央部Ａｃ、及び、内方部Ａｉの３部分を備えたものとなっている。なお、外輪２の軌道２ａについても同様であり、以下、代表として内輪１の軌道１ａについてのみ説明する。   FIG. 2 is a cross-sectional view showing details of the tracks 1a and 2a in FIG. In the figure, for example, the raceway 1a when the raceway rings (inner ring 1, outer ring 2) are viewed on a plane cross section (that is, the cross section shown) including the central axis (not shown) of the ball bearing is shown on the right side of the figure. Assuming that “outer” and the left side are “inner”, the outer portion Ao, the central portion Ac, and the inner portion Ai are provided. The same applies to the track 2a of the outer ring 2. Hereinafter, only the track 1a of the inner ring 1 will be described as a representative.

中央部Ａｃは、内輪１の幅方向（図の左右方向）への中央にあり、円弧で形成されている。円弧は、玉の中心Ｏを中心として、角度θの範囲に形成されている。外方部Ａｏは、中央部Ａｃの幅方向外方にあって、玉３の外周円に対して相対的に対数クラウニング曲線となるように、幅方向外方ほど玉３との隙間Ｇが増加する滑らかな線で形成されている。また、内方部Ａｉは、中央部Ａｃの幅方向内方にあって、玉３の外周円に対して相対的に対数クラウニング曲線となるように、幅方向内側ほど玉３との隙間Ｇが増加する滑らかな線で形成されている。なお、図示しているＧは、特定点を示しているのではなく、玉３と軌道１ａとの接触中心１ｂからの距離ｘに対する関数として示している。   The center portion Ac is in the center in the width direction (the left-right direction in the figure) of the inner ring 1 and is formed by an arc. The arc is formed in the range of the angle θ with the center O of the ball as the center. The outer portion Ao is outward in the width direction of the central portion Ac, and the gap G with the ball 3 increases toward the outer side in the width direction so as to form a logarithmic crowning curve relative to the outer circumferential circle of the ball 3. It is formed with smooth lines. Further, the inner portion Ai is inward in the width direction of the central portion Ac, and the gap G between the inner portion Ai and the ball 3 is closer to the inner side in the width direction so as to form a logarithmic crowning curve relative to the outer circumferential circle of the ball 3. Formed with increasing smooth lines. In addition, G shown in the figure does not show a specific point, but shows it as a function with respect to the distance x from the contact center 1b between the ball 3 and the track 1a.

上記中央部Ａｃの円弧の半径をＲ、玉３の半径をｒとすると、Ｒはｒと「同一」である（Ｒ＝ｒ）。但し、製造上の誤差や温度上昇による体膨張によって、厳密には、Ｒ＞ｒとなることも考えられる。そこで、上記の「同一」とは、使用温度範囲においてｒ≦Ｒ≦１．１ｒの関係を維持することを言うものとする。   When the radius of the arc of the central portion Ac is R and the radius of the ball 3 is r, R is “same” as r (R = r). However, strictly speaking, it is possible that R> r due to manufacturing errors and body expansion due to temperature rise. Therefore, the above “same” means that the relationship r ≦ R ≦ 1.1r is maintained in the operating temperature range.

次に、対数クラウニングについて説明する。クラウニング深さＺは、接触圧力を均一に分布させるための以下の式（Johnson_Gohar の式）により決定することができる。   Next, logarithmic crowning will be described. The crowning depth Z can be determined by the following formula (Johnson_Gohar formula) for uniformly distributing the contact pressure.

Figure 2011112084
Figure 2011112084

式（１）において、各記号は以下のものを表す。
Ｑ：荷重、ν：ポアソン比、Ｅ：ヤング率、Ｌeff：有効接触長さ、ａ0：接触楕円短半径、ｂ：接触楕円長半径（有効接触長さの１／２）、ｘ：接触中心からの距離
ここで例えば、Ｑ＝２０００［Ｎ］、ν＝０．３、Ｅ＝２０６９０１［ＭＰａ］、Ｌeff＝７．５３７６［ｍｍ］、ａ0＝０．１４６２［ｍｍ］、ｂ＝３．７６８８［ｍｍ］として、ｘに対するＺの値を求めると、図３のグラフに示す対数クラウニング曲線が得られる。グラフの横軸は、ｘ：接触中心からの距離［ｍ］、縦軸は、Ｚ：クラウニング深さ［ｍ］である。図示のように、接触中心からの距離ｘが大きくなると、クラウニング深さＺが増大し、かつ、増加率が大きくなり、最終的には無限大になる。 In formula (1), each symbol represents the following.
Q: load, ν: Poisson's ratio, E: Young's modulus, L eff : effective contact length, a 0 : contact ellipse short radius, b: contact ellipse long radius (1/2 of effective contact length), x: contact Here, for example, Q = 2000 [N], ν = 0.3, E = 206901 [MPa], L eff = 7.5376 [mm], a 0 = 0.1462 [mm], b = When the value of Z with respect to x is determined as 3.7688 [mm], a logarithmic crowning curve shown in the graph of FIG. 3 is obtained. The horizontal axis of the graph is x: distance from the contact center [m], and the vertical axis is Z: crowning depth [m]. As shown in the figure, as the distance x from the contact center increases, the crowning depth Z increases, the increase rate increases, and eventually becomes infinite.

図４の（ａ）は、ｘ＝０を中心とした左右対称の対数クラウニング曲線ｆ（ｘ）を示すグラフである。この対数クラウニング曲線ｆ（ｘ）から、軌道に施すべきクラウニング曲線を求めるには、（ｂ）に示す玉の外周円の曲線Ｊにおいて、（ａ）のクラウニング量Ｃｒに等しい隙間Ｇとなるような、軌道の曲線Ｋを求める。そして、（ｃ）に示すような、軌道に施すべきクラウニング量Ｃｒ’を得る。
すなわち、軌道（Ｋ）には、玉の外周円（Ｊ）に対して相対的に対数クラウニング（Ｃｒ＝Ｇ＝Ｊ−Ｋ）が形成されていることになる。これにより、軌道に対する玉の接触圧力を均一に分布させることができる。 FIG. 4A is a graph showing a symmetrical logarithmic crowning curve f (x) with x = 0 as the center. In order to obtain a crowning curve to be applied to the trajectory from this logarithmic crowning curve f (x), a gap G equal to the crowning amount Cr in FIG. The trajectory curve K is obtained. Then, a crowning amount Cr ′ to be applied to the track as shown in (c) is obtained.
That is, logarithmic crowning (Cr = G = J−K) is formed on the trajectory (K) relative to the outer circumference circle (J) of the ball. Thereby, the contact pressure of the ball | bowl with respect to a track | orbit can be distributed uniformly.

図２に戻り、上記のような対数クラウニングが、外方部Ａｏ及び内方部Ａｉの各々と玉３との隙間Ｇとして形成されることにより、エッジロードの発生を回避して、軌道１ａに対する玉３の接触圧力を均一に分布させることができる。これによって、回転トルクも低減することができる。また、中央部Ａｃを円弧とすることで、中央部Ａｃと外方部Ａｏ又は内方部Ａｉとを、互いに滑らかに、かつ、容易に繋ぐことができる。従って、このような玉軸受は、サイズを大きくすることなく、低回転トルクで、より高荷重にも耐え得る負荷容量を備えることができる。このことは、逆に言えば、負荷容量が従来と同じでよい場合には、従来よりもサイズダウンして、より小型軽量化できる、ということになる。   Returning to FIG. 2, the logarithmic crowning as described above is formed as a gap G between each of the outer part Ao and the inner part Ai and the ball 3, thereby avoiding the occurrence of an edge load, and with respect to the track 1 a. The contact pressure of the balls 3 can be evenly distributed. Thereby, rotational torque can also be reduced. Further, by making the central portion Ac an arc, the central portion Ac and the outer portion Ao or the inner portion Ai can be smoothly and easily connected to each other. Therefore, such a ball bearing can be provided with a load capacity that can withstand a higher load with a low rotational torque without increasing the size. In other words, if the load capacity may be the same as the conventional one, the size can be reduced more than the conventional one and the size and weight can be reduced.

また、中央部Ａｃの半径Ｒが、玉３の半径ｒと同一であることによって、軌道輪の断面で見た玉３は、中央部Ａｃと点接触ではなく円弧に沿って線接触することになるので、接触圧力の集中を緩和することができる。
図５は、圧力分布を示す図である。縦縞線で示すように、圧力分布は均一化され、ピーク値が低減される。 Further, since the radius R of the central portion Ac is the same as the radius r of the ball 3, the ball 3 seen in the cross section of the raceway is in line contact with the central portion Ac along the arc instead of point contact. Therefore, the concentration of contact pressure can be reduced.
FIG. 5 is a diagram showing the pressure distribution. As indicated by the vertical stripes, the pressure distribution is made uniform and the peak value is reduced.

なお、実際には、外方部Ａｏ及び内方部Ａｉの輪郭線は、円弧又は直線によって近似的に構成してもよい。すなわちこの場合、作製が必ずしも容易ではない対数クラウニングに基づく曲線を、円弧又は直線の近似によって容易に作製することができる。また、外方部Ａｏ及び内方部Ａｉの輪郭線を、複数の円弧や直線の組み合わせによって近似的に構成することも可能である。
また、図２に示す中央部Ａｃの範囲（角度θ）は、軌道１ａの範囲内で、かつ、外方部Ａｏ及び内方部Ａｉも確保することを条件に、増減可能である。 In practice, the contour lines of the outer part Ao and the inner part Ai may be approximately constituted by an arc or a straight line. That is, in this case, a curve based on logarithmic crowning, which is not always easy to produce, can be easily produced by approximation of an arc or a straight line. It is also possible to approximately configure the contour lines of the outer part Ao and the inner part Ai by a combination of a plurality of arcs and straight lines.
Further, the range (angle θ) of the central portion Ac shown in FIG. 2 can be increased / decreased on the condition that the outer portion Ao and the inner portion Ai are secured within the range of the track 1a.

なお、上記の実施形態は、基本的な構成の玉軸受で説明したが、上記のような軌道の構成（外方部・中央部・内方部）は、各種の玉軸受（例えば、多点接触玉軸受や、スラスト玉軸受）に同様に適用可能である。   In addition, although said embodiment demonstrated the ball bearing of the basic composition, the structure (outer part, center part, inner part) as mentioned above has various ball bearings (for example, multipoints). It can be similarly applied to contact ball bearings and thrust ball bearings.

１：内輪、１ａ：軌道、２：外輪、２ａ：軌道、３：玉、Ａｏ：外方部、Ａｃ：中央部、Ａｉ：内方部、Ｇ：隙間   1: Inner ring, 1a: Track, 2: Outer ring, 2a: Track, 3: Ball, Ao: Outer part, Ac: Center part, Ai: Inner part, G: Gap

Claims (3)

玉軸受において、中心軸を含む平面の断面で軌道輪を見た場合の軌道が、
前記軌道輪の幅方向への中央にあって、円弧で形成された中央部と、
前記中央部の幅方向外方にあって、玉の外周円に対して相対的に対数クラウニング曲線となるように、幅方向外方ほど当該玉との隙間が増加する滑らかな線で形成された外方部と、
前記中央部の幅方向内方にあって、前記玉の外周円に対して相対的に対数クラウニング曲線となるように、幅方向内方ほど前記玉との隙間が増加する滑らかな線で形成された内方部と
によって構成されることを特徴とする玉軸受。 In the ball bearing, the raceway when the raceway is viewed in a plane cross section including the central axis is
A central portion formed in an arc in the center in the width direction of the raceway, and
It was formed in a smooth line in which the gap with the ball increased toward the outer side in the width direction so as to be a logarithmic crowning curve relative to the outer circumference circle of the ball at the outer side in the width direction of the central portion. The outside,
It is formed in a smooth line in which the gap with the ball increases toward the inner side in the width direction so as to be a logarithmic crowning curve relative to the outer circumference circle of the ball at the inner side in the width direction of the center portion. A ball bearing characterized by comprising an inner part and an inner part. 前記中央部の円弧の曲率半径は、前記玉の半径と同一である請求項１記載の玉軸受。   The ball bearing according to claim 1, wherein a radius of curvature of the arc of the central portion is the same as a radius of the ball. 前記滑らかな線は、円弧又は直線によって近似的に構成される請求項１記載の玉軸受。   The ball bearing according to claim 1, wherein the smooth line is approximately constituted by an arc or a straight line.
JP2009266611A 2009-11-24 2009-11-24 Ball bearing Pending JP2011112084A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2018066453A (en) * 2016-10-21 2018-04-26 株式会社ジェイテクト Rolling bearing
CN114738377A (en) * 2022-05-12 2022-07-12 镇江沃尔夫重工部件有限公司 High-bearing ball bearing, design forming method and processing equipment thereof

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2018066453A (en) * 2016-10-21 2018-04-26 株式会社ジェイテクト Rolling bearing
CN114738377A (en) * 2022-05-12 2022-07-12 镇江沃尔夫重工部件有限公司 High-bearing ball bearing, design forming method and processing equipment thereof
CN114738377B (en) * 2022-05-12 2024-01-23 镇江沃尔夫重工部件有限公司 High-load ball bearing, design forming method and processing equipment thereof

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