WO2023135667A1 - Roulement à billes - Google Patents

Roulement à billes Download PDF

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Publication number
WO2023135667A1
WO2023135667A1 PCT/JP2022/000639 JP2022000639W WO2023135667A1 WO 2023135667 A1 WO2023135667 A1 WO 2023135667A1 JP 2022000639 W JP2022000639 W JP 2022000639W WO 2023135667 A1 WO2023135667 A1 WO 2023135667A1
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WO
WIPO (PCT)
Prior art keywords
outer ring
balls
inner ring
raceway
diameter
Prior art date
Application number
PCT/JP2022/000639
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English (en)
Japanese (ja)
Inventor
清兼 岩本
勇泰 久保山
知博 石井
Original Assignee
株式会社ジェイテクト
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 株式会社ジェイテクト filed Critical 株式会社ジェイテクト
Priority to PCT/JP2022/000639 priority Critical patent/WO2023135667A1/fr
Publication of WO2023135667A1 publication Critical patent/WO2023135667A1/fr

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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
    • F16C19/18—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 two or more rows of 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
    • F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
    • F16C33/30—Parts of ball or roller bearings
    • F16C33/32—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
    • 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
    • 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
    • F16C43/00—Assembling bearings
    • F16C43/04—Assembling rolling-contact bearings

Definitions

  • This disclosure relates to ball bearings.
  • angular contact ball bearings of double-row ball bearings have the minor angle between the bearing central axis and the line of action of each row of balls arranged in the same direction, and the pitch diameter of the ball set of each row of balls is made different, and the single-row A ball bearing is known that can bear a greater axial load than an angular contact ball bearing.
  • Such ball bearings are called tandem type.
  • FIG. 13 is a sectional view showing a conventional ball bearing.
  • a conventional ball bearing 210 comprises an inner ring assembly 235 and an outer ring 220 .
  • the inner ring assembly 235 includes an inner ring 230 , a plurality of first balls 241 , a plurality of second balls 242 , a first retainer 251 and a second retainer 252 .
  • the diameter of the plurality of first balls 241 and the diameter of the plurality of second balls 242 are the same.
  • the inner ring 230 has a first inner ring raceway 231 on the first side in the axial direction and a second inner ring raceway 232 on the second side in the axial direction of the first inner ring raceway 231 on the outer peripheral surface.
  • the raceway contact diameter of the first inner ring raceway 231 is smaller than the raceway contact diameter of the second inner ring raceway 232 .
  • a plurality of first balls 241 are arranged to roll on the first inner ring raceway 231 .
  • the first retainer 251 has multiple pockets.
  • a plurality of first balls 241 are slidably disposed in a plurality of pockets of the first retainer 251 . Since the diameter of the inscribed circle of the radially outer openings of the plurality of pockets of the first retainer 251 is smaller than the diameter of the first balls 241, the plurality of first balls 241 are each held in the first holding state.
  • the inner ring 230, the plurality of first balls 241 and the first retainer 251 are not separated.
  • a plurality of second balls 242 are arranged to roll on the second inner ring raceway 232 .
  • the second retainer 252 has multiple pockets.
  • a plurality of second balls 242 are slidably disposed in a plurality of pockets of the second retainer 252 . Since the diameter of the inscribed circle of the radially outer openings of the plurality of pockets of the second retainer 252 is smaller than the diameter of the second balls 242, the plurality of second balls 242 are each held in the second holding state.
  • the inner ring 230, the plurality of second balls 242, and the second retainer 252 do not separate when placed in each pocket of the container 252 and placed on the second inner ring raceway 232.
  • the inner ring assembly 235 is assembled so that the inner ring 230, the plurality of first balls 241, the plurality of second balls 242, the first retainer 251, and the second retainer 252 are not separated. It is
  • the pitch diameter of the ball set in the row of the first balls 241 formed by the plurality of first balls 241 of the inner ring assembly 235 is the same as the pitch diameter of the balls in the row of the second balls 242 formed by the plurality of second balls 242. Smaller than the pitch diameter of the set.
  • the outer ring 220 has a first outer ring raceway 221 on the first side in the axial direction and a second outer ring raceway 222 on the second side in the axial direction of the first outer ring raceway 221 on its inner peripheral surface.
  • the raceway contact diameter of the first outer ring raceway 221 is smaller than the raceway contact diameter of the second outer ring raceway 222 .
  • Ball bearing 210 is formed by combining inner ring assembly 235 and outer ring 220 .
  • the plurality of first balls 241 are rollably arranged on the first outer ring raceway 221, and the plurality of second balls 242 are rollably arranged on the second outer ring raceway 222.
  • the nominal contact point of the first inner ring raceway 231 is located on the second axial side of the nominal contact point of the first outer ring raceway 221 .
  • the nominal contact point of the second inner ring raceway 232 is located on the second axial side of the nominal contact point of the second outer ring raceway 222 .
  • the side surface on the first axial side of the inner ring 230 is the front surface of the inner ring 230
  • the side surface on the second axial side is the rear surface of the inner ring 230 .
  • the side surface of the outer ring 220 on the first side in the axial direction is the rear surface of the outer ring 220
  • the side surface on the second side in the axial direction is the front surface of the outer ring 220 . Since the ball bearing 210 has two rows of balls, the axial load that the ball bearing 210 can bear is larger than the axial load that a single-row angular contact ball bearing can bear (see, for example, Patent Document 1).
  • the diameter of the first ball 241 and the diameter of the second ball 242 are the same.
  • the life of the first row of balls 241, the first inner ring raceway 231, and the first outer ring raceway 221, the life of the second row of balls 242, the second inner ring raceway 232, and the second outer ring raceway 222 It may be greatly different from the life related to.
  • a ball bearing of the present disclosure comprises an inner ring assembly, an outer ring, the inner ring assembly comprising an inner ring, a plurality of first balls, a plurality of second balls, a first cage, and a second retainer, the inner ring having a first inner ring raceway on a first axial side and a second inner ring raceway on a second axial side of the first inner ring raceway; , on the outer peripheral surface, the raceway contact diameter of the first inner ring raceway is smaller than the raceway contact diameter of the second inner ring raceway, and the plurality of first balls are arranged on the first inner ring raceway.
  • the first retainer has a plurality of first pockets, the plurality of first balls are slidably arranged in the first pockets, the plurality of A second ball is rotatably disposed on the second inner ring raceway, the second retainer has a plurality of second pockets, the plurality of second balls are arranged in the second The inner ring, the plurality of first balls, the plurality of second balls, the first retainer, and the second retainer are separated from each other. and the pitch diameter of the ball set in the first row of balls formed by the plurality of first balls of the inner ring assembly is equal to the pitch diameter of the second ball formed by the plurality of second balls.
  • the outer ring has a first outer ring raceway, a first inclined surface and a second having an inclined surface and a second outer ring raceway on the inner peripheral surface, the inner peripheral surface of the outer ring expanding without decreasing in diameter from the first outer ring raceway to the second outer ring raceway;
  • the raceway contact diameter of the first outer ring raceway is smaller than the raceway contact diameter of the second outer ring raceway, the diameter of the plurality of first balls is smaller than the diameter of the plurality of second balls;
  • the plurality of first balls are rollably arranged on the first outer ring raceway, the plurality of second balls are rollably arranged on the second outer ring raceway, and the first ball is arranged to roll on the second outer ring raceway.
  • the nominal contact point of the inner ring raceway is located on the second side in the axial direction from the nominal contact point of the first outer ring raceway, and the nominal contact point of the second inner ring raceway is the nominal contact point of the second outer ring raceway.
  • the first inclined surface is formed on the second side in the axial direction of the first outer ring raceway on the inner peripheral surface of the outer ring. It is an inclined surface that expands in diameter from a first side toward a second side, and the second inclined surface is on the second side in the axial direction of the first inclined surface on the inner peripheral surface of the outer ring.
  • a first minor angle formed by the first inclined surface and the central axis of the outer ring in a cross section is equal to a second minor angle formed by the second inclined surface and the central axis of the outer ring in a cross section including the central axis of the outer ring.
  • a first minor radius which is the radius of the first minor circle, is half the diameter of the first ball on the great circle, and half the pitch diameter of the ball set in the first row of balls is the first minor radius.
  • a torus with a first major radius that is the radius of one great circle is defined as a first virtual torus, and when the plurality of second balls are arranged and brought into contact with the second inner ring raceway, the The center of each second ball of the plurality of second balls is on the second great circle, and half the diameter of the second ball is the second minor radius, which is the radius of the second small circle;
  • a second virtual torus is defined as a torus having a second major radius, which is the radius of the second great circle, which is half the pitch diameter of the ball set of the second row of balls, and includes the bearing center axis.
  • a radial first side and a radial second side that is 180° circumferentially opposite the radial first side are defined, and the radial second side
  • a second end point is defined as an intersection point of the first virtual torus on the first side with the surface of the first side in the radial direction, and a line segment connecting the first end point and the second end point is defined as the first end point.
  • a line segment a line segment connecting the first end point and the third end point, with a third end point on the second side in the axial direction of the first inclined surface on the first side in the radial direction; is a second line segment, a point on the first inclined surface on the first side in the radial direction and the shortest distance from the first end point is the fourth end point, and the first end point and the A line segment connecting the fourth end point is defined as a third line segment, and the length of the first line segment is greater than the length of the second line segment, or the length of the first line segment is is smaller than the length of the second line segment and smaller than the length of the third line segment.
  • the outer ring has the first outer ring raceway, the first inclined surface, and the second radial direction on the inner peripheral surface from the first side in the axial direction toward the second side. , the second outer ring raceway, and a third inclined surface, and the inner peripheral surface of the outer ring is reduced in diameter from the first outer ring raceway to the third inclined surface.
  • the first minor angle is smaller than the third minor angle formed by the third inclined surface and the central axis of the outer ring in a cross section including the central axis of the outer ring.
  • the plurality of second balls and an imaginary plane including the front surface of the second axial side of the outer ring and perpendicular to the central axis of the outer ring overlap in the axial direction.
  • FIG. 3 is a schematic diagram showing an outline of a first virtual torus and a second virtual torus; It is a sectional view showing an outer race concerning a 1st embodiment.
  • FIG. 4 is a cross-sectional view showing each inclined surface formed on the inner peripheral surface of the outer ring;
  • FIG. 3 is a cross-sectional view showing how the outer ring is assembled to the inner ring assembly of the ball bearing according to the first embodiment;
  • FIG. 3 is a schematic diagram showing an outline of a first virtual torus and a second virtual torus; It is a sectional view showing an outer race concerning a 1st embodiment.
  • FIG. 4 is a cross-sectional view showing each inclined surface formed on the inner peripheral surface of the outer ring;
  • FIG. 3 is a cross-sectional view showing how the outer ring is assembled to the inner ring assembly
  • FIG. 7 is a cross-sectional view showing how the outer ring is assembled to the inner ring assembly of the ball bearing according to the second embodiment; It is a sectional view showing the whole ball bearing composition concerning a comparative example.
  • FIG. 3 is a cross-sectional view showing an outer ring according to a comparative example;
  • FIG. 5 is a cross-sectional view showing how an outer ring is attached to an inner ring assembly of a ball bearing according to a comparative example;
  • FIG. 10 is a cross-sectional view showing a conventional ball bearing;
  • FIG. 4 is a cross-sectional view showing how an outer ring is attached to an inner ring assembly in a ball bearing of a comparative example;
  • FIG. 14 is a cross-sectional view showing how the outer ring is attached to the inner ring assembly in the ball bearing of the comparative example.
  • the second balls 242 of the conventional double-row ball bearing 210 shown in FIG. It is a configuration that converts A double-row ball bearing 110 of the comparative example includes an inner ring assembly 135 and an outer ring 120 .
  • the inner ring assembly 135 includes an inner ring 130 , a plurality of first balls 141 , a plurality of second balls 142 , a first retainer 151 and a second retainer 152 .
  • the inner ring 130 has a first inner ring raceway 131 on the first side in the axial direction and a second inner ring raceway 132 on the second side in the axial direction of the first inner ring raceway 131 on the outer peripheral surface.
  • the raceway contact diameter of the first inner ring raceway 131 is smaller than the raceway contact diameter of the second inner ring raceway 132 .
  • a plurality of first balls 141 are arranged to roll on the first inner ring raceway 131 .
  • the first retainer 151 has multiple pockets. The plurality of first balls 141 are slidably arranged in the plurality of pockets of the first retainer 151 .
  • the plurality of first balls 141 are respectively attached to the first retainer. 151 and placed on the first inner ring raceway 131, the inner ring 130, the plurality of first balls 141 and the first retainer 151 are not separated.
  • a plurality of second balls 142 are arranged to roll on the second inner ring raceway 132 .
  • the second retainer 152 has multiple pockets.
  • a plurality of second balls 142 are slidably disposed in a plurality of pockets of the second retainer 152 .
  • the plurality of second balls 142 are respectively attached to the second retainer.
  • the inner ring 130, the plurality of second balls 142 and the second retainer 152 do not separate.
  • the inner ring 130, the plurality of first balls 141, the plurality of second balls 142, the first retainer 151, and the second retainer 152 are configured so as not to separate.
  • the pitch diameter of the ball set in the row of the first balls 141 formed by the plurality of first balls 141 of the inner ring assembly 135 is the same as the pitch diameter of the balls in the row of the second balls 142 formed by the plurality of second balls 142. Smaller than the pitch diameter of the set.
  • the diameter of the plurality of first balls 141 is smaller than the diameter of the plurality of second balls 142 .
  • the outer ring 120 has a first outer ring raceway 121, a first inclined surface 123, a second inclined surface 124, and a second outer ring raceway 122 from the first side in the axial direction to the second side. and a third inclined surface 125 on the inner peripheral surface.
  • the inner peripheral surface of the outer ring 120 expands from the first outer ring raceway 121 to the third inclined surface 125 without decreasing in diameter.
  • the raceway contact diameter of the first outer ring raceway 121 is smaller than the raceway contact diameter of the second outer ring raceway 122 .
  • Ball bearing 110 is formed by combining inner ring assembly 135 and outer ring 120 .
  • a plurality of first balls 141 are arranged to roll on the first outer ring raceway 121 .
  • a plurality of second balls 142 are arranged to roll on the second outer ring raceway 122 .
  • the nominal contact point of the first inner ring raceway 131 is located on the second axial side of the nominal contact point of the first outer ring raceway 121 .
  • the nominal contact point of the second inner ring raceway 132 is located on the second axial side of the nominal contact point of the second outer ring raceway 122 .
  • the first inclined surface 123 is formed on the inner peripheral surface of the outer ring 120 on the second side in the axial direction of the first outer ring raceway 121 and has a diameter that increases from the first side in the axial direction toward the second side. It is a conical surface that
  • the second inclined surface 124 is formed on the second axial side of the first inclined surface 123 on the inner peripheral surface of the outer ring 120 and on the first axial side of the second outer ring raceway 122, It is a conical surface that expands in diameter from a first axial side toward a second axial side.
  • a third inclined surface 125 is formed on the inner peripheral surface of the outer ring 120 on the axial second side of the second outer ring raceway 122 , adjoins the front surface of the outer ring 120 , and extends from the axial first side to the third axial side. It is a conical surface that expands toward the side of 2.
  • An object of the present disclosure is to improve the assembling property of the outer ring to the inner ring assembly and to suppress damage to the ball bearing in the ball bearing.
  • a ball bearing of the present disclosure comprises an inner ring assembly and an outer ring, the inner ring assembly comprising an inner ring, a plurality of first balls, a plurality of second balls, and a first retainer. and a second retainer, wherein the inner ring has a first inner ring raceway on a first axial side and a second inner ring raceway on a second axial side of the first inner ring raceway.
  • the raceway contact diameter of the first inner ring raceway being smaller than the raceway contact diameter of the second inner ring raceway, and the plurality of first balls rollingly disposed on an inner ring raceway
  • the first retainer having a plurality of first pockets, the plurality of first balls slidably disposed in the first pockets;
  • the plurality of second balls are arranged to be able to roll on the second inner ring raceway, the second retainer has a plurality of second pockets, and the plurality of second balls are: slidably disposed in the second pocket, the inner ring, the plurality of first balls, the plurality of second balls, the first retainer, and the second retainer; are configured not to separate, and the pitch diameter of the ball set in the first row of balls formed by the plurality of first balls of the inner ring assembly is equal to the pitch diameter of the ball set formed by the plurality of second balls.
  • the outer ring has, from the first side in the axial direction toward the second side, a first outer ring raceway, a first inclined surface;
  • the inner peripheral surface of the outer ring has a second inclined surface and a second outer ring raceway, and the inner peripheral surface of the outer ring does not decrease in diameter from the first outer ring raceway to the second outer ring raceway.
  • the raceway contact diameter of the first outer ring raceway is smaller than the raceway contact diameter of the second outer ring raceway, and the diameter of the plurality of first balls is smaller than the diameter of the plurality of second balls.
  • the plurality of first balls are arranged so as to be able to roll on the first outer ring raceway; the plurality of second balls are arranged so as to be able to roll on the second outer ring raceway;
  • the nominal contact point of the first inner ring raceway is located on the second side in the axial direction from the nominal contact point of the first outer ring raceway, and the nominal contact point of the second inner ring raceway is located on the second outer ring.
  • the first inclined surface being formed on the second side in the axial direction of the first outer ring raceway on the inner peripheral surface of the outer ring, It is an inclined surface that expands in diameter from a first side toward a second side in the axial direction, and the second inclined surface is the second inclined surface in the axial direction of the first inclined surface on the inner peripheral surface of the outer ring.
  • a first minor angle formed by the first inclined surface and the central axis of the outer ring in a cross section containing the axis is equal to a first minor angle formed by the second inclined surface and the central axis of the outer ring in a cross section containing the central axis of the outer ring.
  • the center of each first ball of the plurality of first balls is smaller than the second minor angle formed and when the plurality of first balls are arranged on the first inner ring raceway and brought into contact with each other.
  • half the diameter of the first ball is the radius of the first minor circle, the first minor radius being the radius of the first minor circle, and half the pitch diameter of the ball set of the first row of balls.
  • the radius of the first great circle is the radius of the first great circle
  • the torus is defined as the first virtual torus
  • the plurality of second balls are arranged and brought into contact with the second inner ring raceway
  • the center of each second ball of said plurality of second balls is on a second great circle
  • half the diameter of said second ball is the radius of a second minor circle.
  • a second virtual torus is defined as a torus having a radius and a half of the pitch diameter of the ball set of the second ball row as the second major radius, which is the radius of the second great circle, and the bearing center
  • a radial first side and a radial second side that is 180° circumferentially opposite the radial first side are defined, and a radial second side
  • the outer ring has the first outer ring raceway and the first inclined surface extending from the first side in the axial direction to the second side on the inner peripheral surface.
  • the second inclined surface, the second outer ring raceway, and a third inclined surface, and the inner peripheral surface of the outer ring extends from the first outer ring raceway to the third inclined surface.
  • the diameter is enlarged without being reduced, and the first minor angle is smaller than the third minor angle formed by the third inclined surface and the central axis of the outer ring in a cross section including the central axis of the outer ring.
  • FIG. 1 is a cross-sectional view showing the overall configuration of a ball bearing according to the first embodiment.
  • the ball bearing 10 shown in FIG. 1 is a double-row angular contact ball bearing in which the minor angles between the bearing central axis and the line of action of each row of balls are set in the same direction, and the pitches of the ball sets of each row of balls are equal to each other.
  • This is a ball bearing with different diameters that can handle a greater axial load than a single-row angular contact ball bearing.
  • Such ball bearings are called tandem type.
  • the ball bearing 10 is used, for example, to rotatably support a pinion shaft constituting a differential mechanism (gear mechanism), which is a bearing device used in a differential gear device mounted on an automobile or the like, with respect to a case. .
  • the ball bearing 10 has an inner ring assembly 35 and an outer ring 20 .
  • the central axis of the ball bearing 10 will be referred to as central axis C1.
  • the central axis of the outer ring 20 is called central axis C2
  • the central axis of the inner ring 30 is called central axis C3.
  • the central axis C2 of the outer ring 20 and the central axis C3 of the inner ring 30 coincide with the central axis C1 of the ball bearing 10 in which the inner ring assembly 35 and the outer ring 20 are combined.
  • one direction along the central axis C1 of the ball bearing 10 is referred to as a first axial side, and is 180° opposite to the first axial side along the central axis of the ball bearing 10.
  • the side direction is referred to as the axial second side.
  • one direction perpendicular to the central axis C1 is referred to as a radial first side.
  • the direction 180° opposite to the side of is referred to as a second side in the radial direction.
  • FIG. 2 is a cross-sectional view showing the inner ring assembly.
  • the inner ring assembly 35 includes an inner ring 30 , a plurality of first balls 41 , a plurality of second balls 42 , a first retainer 51 and a second retainer 52 .
  • the inner ring 30 shown in FIG. 2 is made of steel such as high-carbon chromium bearing steel, carbon steel, or alloy steel.
  • the inner ring 30 is cylindrical.
  • the inner ring 30 has a first shoulder, a first inner ring raceway 31, a second shoulder, a second inner ring raceway 32, a third inner ring raceway 32, and a third inner ring raceway 31 from the first side in the axial direction toward the second side. and a shoulder on the outer peripheral surface.
  • the first shoulder has a cylindrical outer peripheral surface.
  • the first inner ring raceway 31 is a raceway groove having a groove radius slightly larger than half the diameter of a first ball 41 to be described later.
  • the second shoulder is a conical surface followed by a cylindrical surface whose outer peripheral surface increases in diameter from the first axial side to the second axial side.
  • the second inner ring raceway 32 is a raceway groove having a groove radius slightly larger than half the diameter of a second ball 42 to be described later.
  • the third shoulder has a cylindrical outer peripheral surface.
  • the raceway contact diameter of the first inner ring raceway 31 is smaller than the raceway contact diameter of the second inner ring raceway 32 .
  • the diameter of the first shoulder is larger than the raceway contact diameter of the first inner ring raceway 31 and smaller than the diameter of the second shoulder.
  • the diameter of the second shoulder is larger than the diameter of the second inner ring raceway 32 and smaller than the diameter of the third shoulder.
  • the first ball 41 is made of steel such as high carbon chromium bearing steel.
  • the second ball 42 is made of steel such as high carbon chromium bearing steel.
  • the diameter of the first ball 41 is smaller than the diameter of the second ball 42 .
  • the first retainer 51 is formed in an annular shape.
  • the first retainer 51 has a first annular body 51a, a second annular body 51b, and a plurality of first pillars 51c.
  • the first annular body 51a is on the first axial side of the plurality of first posts 51c.
  • the second annular body 51b is on the second axial side of the plurality of first posts 51c.
  • a plurality of first posts 51c connect to the first annular body 51a on a second axial side of the first annular body 51a.
  • a plurality of first posts 51c connect to the second annular body 51b on a first axial side of the second annular body 51b.
  • the plurality of first columns 51c are arranged at regular intervals in the circumferential direction of the first annular body 51a.
  • the diameter of the outer peripheral surface of the first annular body 51a is smaller than the diameter of the outer peripheral surface of the second annular body 51b.
  • the diameter of the inner peripheral surface of the first annular body 51a is smaller than the diameter of the inner peripheral surface of the second annular body 51b.
  • a region surrounded by the first annular body 51a, the second annular body 51b, and the first pillars 51c adjacent in the circumferential direction forms a plurality of first pockets 53 that hold the first balls 41. do.
  • the diameter of the inscribed circle of the radially outer openings of the plurality of first pockets 53 of the first retainer 51 is smaller than the diameter of the first balls 41 .
  • the first retainer 51 is made of synthetic resin such as polyamide resin, polyphenylene sulfide resin, or phenol resin.
  • the second retainer 52 is formed in an annular shape.
  • the second retainer 52 has a third annular body 52b, a fourth annular body 52a, and a plurality of second posts 52c.
  • the third annular body 52b is on the first axial side of the plurality of second posts 52c.
  • the fourth annular body 52a is on the second axial side of the plurality of second posts 52c.
  • a plurality of second posts 52c connect to the third annular body 52b on a second axial side of the third annular body 52b.
  • a plurality of second posts 52c connect to the fourth annular body 52a on a first axial side of the fourth annular body 52a.
  • the plurality of second columns 52c are arranged at regular intervals in the circumferential direction of the third annular body 52b.
  • the diameter of the outer peripheral surface of the third annular body 52b is smaller than the diameter of the outer peripheral surface of the fourth annular body 52a.
  • the diameter of the inner peripheral surface of the third annular body 52b is smaller than the diameter of the inner peripheral surface of the fourth annular body 52a.
  • a region surrounded by the third annular body 52b, the fourth annular body 52a, and the second pillars 52c adjacent in the circumferential direction forms a plurality of second pockets 54 that hold the second balls 42. do.
  • the diameter of the inscribed circle of the radially outer openings of the plurality of second pockets 54 of the second retainer 52 is smaller than the diameter of the second balls 42 .
  • the second retainer 52 is made of synthetic resin such as polyamide resin, polyphenylene sulfide resin, or phenol resin.
  • the plurality of first balls 41 forming the row of the first balls 41 are arranged to roll on the first inner ring raceway 31 of the inner ring 30 .
  • the plurality of first balls 41 are slidably arranged in the plurality of first pockets 53 of the first retainer 51 .
  • a plurality of first pockets 53 are formed along the circumferential direction so that the first retainer 51 can hold the plurality of first balls 41 at regular intervals along the circumferential direction. . Since the diameter of the inscribed circle of the radially outer openings of the plurality of first pockets 53 of the first retainer 51 is smaller than the diameter of the first balls 41, the first balls 41 do not drop radially outward from the first pocket 53 of the retainer 51 of the .
  • the diameter of the cylindrical surface of the outer peripheral surface of the first shoulder is larger than the raceway contact diameter of the first inner ring raceway 31 .
  • the minimum diameter of the conical surface of the outer peripheral surface of the second shoulder is larger than the raceway contact diameter of the first inner ring raceway 31 . Therefore, when the plurality of first balls 41 are arranged in the respective first pockets 53 of the first retainer 51 and arranged on the first inner ring raceway 31, the inner ring 30 and the plurality of first balls 41 and the first retainer 51 are not separated.
  • a plurality of second balls 42 forming a row of second balls 42 are arranged to roll on the second inner ring raceway 32 of the inner ring 30 .
  • a plurality of second balls 42 are slidably disposed in a plurality of second pockets 54 of the second retainer 52 .
  • a plurality of second pockets 54 are formed along the circumferential direction so that the second retainer 52 can hold the plurality of second balls 42 at regular intervals along the circumferential direction. . Since the diameter of the inscribed circle of the radially outer openings of the plurality of second pockets 54 of the second retainer 52 is smaller than the diameter of the second balls 42, the second balls 42 from the second pocket 54 of the retainer 52 in the radial direction.
  • the diameter of the cylindrical surface of the outer peripheral surface of the second shoulder is larger than the raceway contact diameter of the second inner ring raceway 32 .
  • the diameter of the cylindrical surface of the outer peripheral surface of the third shoulder is larger than the raceway contact diameter of the second inner ring raceway 32 . Therefore, when the plurality of second balls 42 are arranged in the respective second pockets 54 of the second retainer 52 and arranged on the second inner ring raceway 32, the inner ring 30 and the plurality of second balls 42 and the second retainer 52 are not separated.
  • the inner ring assembly 35 includes an inner ring 30, a plurality of first balls 41, a plurality of second balls 42, a first retainer 51, and a second retainer 52. , are configured so that they do not separate. In other words, the inner ring assembly 35 is obtained by removing the outer ring 20 from the ball bearing 10 .
  • the pitch diameter of the ball set in the row of the first balls 41 formed by the plurality of first balls 41 of the inner ring assembly 35 is the same as the pitch diameter of the balls in the row of the second balls 42 formed by the plurality of second balls 42. Smaller than the pitch diameter of the set.
  • the first virtual torus T1 is a virtual three-dimensional shape that represents the rolling area of the plurality of first balls 41 that are rotatably arranged on the first inner ring raceway 31 .
  • the first virtual torus T1 is the position of each first ball 41 when each first ball 41 is arranged and contacted with the first inner ring raceway 31 when the inner ring assembly 35 and the outer ring 20 are assembled.
  • the radius of the first small circle SC1, which is the outer shape of the cross section including the center, is defined as the first small radius Sr1
  • the radius of the first large circle BC1 which is the imaginary circle connecting the centers of the first balls 41
  • the first small radius Sr1 is the radius of the first balls 41 and is half the diameter of the first balls 41
  • the first large radius Br1 is composed of the plurality of first balls 41. It is half the pitch diameter of the set of balls in the row of the first balls 41 that are set.
  • the center of each first ball 41 of the plurality of first balls 41 is positioned on the first great circle BC1.
  • the first virtual torus T1 is defined with reference to the first balls 41 arranged on the first inner ring raceway 31, but the first virtual torus T1 is the inner ring assembly 35 and The first balls 41 when the first balls 41 are arranged and contacted with the first outer ring raceway 21 when the outer ring 20 is assembled may be defined as a reference.
  • the second virtual torus T2 is a virtual three-dimensional shape that represents the rolling area of the plurality of second balls 42 that are rollably arranged on the second inner ring raceway 32 .
  • the second virtual torus T2 is the position of each second ball 42 when each second ball 42 is arranged and comes into contact with the second inner ring raceway 32 when the inner ring assembly 35 and the outer ring 20 are assembled.
  • the radius of the second small circle SC2, which is the outer shape of the cross section including the center, is defined as the second small radius Sr2
  • the radius of the second large circle BC2 which is the imaginary circle connecting the centers of the second balls 42, is defined as the second small radius Sr2.
  • the second minor radius Sr2 is the radius of the second balls 42 and is half the diameter of the second balls 42
  • the second major radius Br2 is composed of the plurality of second balls 42. It is half the pitch diameter of the set of balls in the second row of balls 42 being set.
  • the center of each second ball 42 of the plurality of second balls 42 is positioned on the second great circle BC2.
  • the second virtual torus T2 is defined with reference to the second balls 42 arranged on the second inner ring raceway 32.
  • the second virtual torus T2 is the inner ring assembly 35.
  • the second balls 42 may be defined as a reference when the second balls 42 are arranged and contacted with the second outer ring raceway 22 when the outer ring 20 is assembled.
  • a first straight line L1 is defined for convenience of explanation.
  • the first straight line L1 extends across the central axis C3, the first great circle BC1 on the first radial side, and the second great circle BC1 on the second radial side in a cross section including the central axis C3 of the inner ring 30. It is a straight line that intersects with the great circle BC2.
  • the first radial side is one radial direction in a cross section including the central axis C3 of the inner ring 30, and the second radial side is the second radial direction in a cross section including the central axis C3 of the inner ring 30.
  • the 1 side is the radial direction opposite to the center axis C3 of the inner ring 30 by 180° in the circumferential direction.
  • a point a (first end point) is the intersection of the first straight line L1 and the second great circle BC2 on the second side in the radial direction in a cross section including the center axis C3 of the inner ring 30 .
  • a point a (first end point) is the center of the second ball 42 when the center of the second ball 42 is shown on the cross section including this central axis C3.
  • the point b (second end point) is the first straight line L1 and the first radial side of the first imaginary torus T1 on the cross section including the central axis C3 of the inner ring 30.
  • first line segment ab is a portion of the first straight line L1.
  • points a and b are out of phase by 180°.
  • FIG. 4 is a cross-sectional view showing the outer ring according to the first embodiment.
  • FIG. 5 is a cross-sectional view showing each inclined surface formed on the inner peripheral surface of the outer ring 20.
  • the outer ring 20 is made of steel such as high-carbon chromium bearing steel, carbon steel, or alloy steel.
  • the outer ring 20 has, from the axial first side to the second side, a fourth shoulder, a first outer ring raceway 21, a first inclined surface 23, a second inclined surface 24, It has a second outer ring raceway 22 and a third inclined surface 25 on the inner peripheral surface.
  • the inner peripheral surface of the outer ring 20 expands from the first outer ring raceway 21 to the third inclined surface 25 without decreasing in diameter.
  • the raceway contact diameter of the first outer ring raceway 21 is smaller than the raceway contact diameter of the second outer ring raceway 22 .
  • the first inclined surface 23 is formed on the inner peripheral surface of the outer ring 20 on the second side in the axial direction of the first outer ring raceway 21 and has a diameter that increases from the first side in the axial direction toward the second side. It is a conical surface that The second inclined surface 24 is formed on the second axial side of the first inclined surface 23 on the inner peripheral surface of the outer ring 20 and on the first axial side of the second outer ring raceway 22, It is a conical surface that expands in diameter from a first axial side toward a second axial side.
  • the third inclined surface 25 is formed on the inner peripheral surface of the outer ring 20 on the axial second side of the second outer ring raceway 22 , adjoins the front surface of the outer ring 20 , and extends from the axial first side to the third axial side. It is a conical surface that expands toward the side of 2.
  • the axial length of the second inclined surface 24 is preferably 1/10 to 1/2 of the axial length of the first inclined surface 23 .
  • the axial length of the third inclined surface 25 is preferably 1/10 to 1/2 of the axial length of the first inclined surface 23 .
  • a first inferiority plane formed by the first inclined surface 23 and the central axis C2 of the outer ring 20 in FIG. 5, a cylindrical surface centered on the central axis C2 of the outer ring 20.
  • the angle ⁇ 1 is the angle between the second inclined surface 24 and the central axis C2 of the outer ring 20 (in FIG. 5, a cylindrical surface centered on the central axis C2 of the outer ring 20) in a cross section including the central axis C2 of the outer ring 20. less than the minor angle ⁇ 2 of 2.
  • the first minor angle ⁇ 1 is between the third inclined surface 25 and the central axis C2 of the outer ring 20 (in FIG. ) is smaller than the third minor angle ⁇ 3 formed by
  • the first minor angle ⁇ 1 is preferably 12° or less.
  • the second minor angle ⁇ 2 is preferably 25° or more and 75° or less.
  • the third minor angle ⁇ 3 is preferably 25° or more and 75° or less.
  • a second straight line L2 is defined for convenience of explanation.
  • a first virtual torus T1 and a second virtual torus T2 are arranged on the outer ring 20 .
  • the centers of the plurality of first balls 41 arranged on the first outer ring raceway 21 when the inner ring assembly 35 and the outer ring 20 are assembled are aligned on the first great circle BC1.
  • the centers of the plurality of second balls 42 arranged on the second outer ring raceway 22 when the inner ring assembly 35 and the outer ring 20 are assembled are aligned on the second great circle BC2.
  • the second straight line L2 is defined in a cross section including the central axis C2 of the outer ring 20, along the central axis C2, the second great circle BC2 on the second radial side, and the first great circle BC2 on the first radial side. It is a straight line that intersects the most axial second side of the inclined surface 23 .
  • a point c is a point where the second straight line L2 and the second great circle BC2 (see FIG. 3) on the second side in the radial direction intersect in a cross section including the central axis C2 of the outer ring 20 .
  • a point c is the center of the second ball 42 when the center of the second ball 42 is shown on the cross section including the central axis C2. Note that the point c coincides with the point a in a cross section including the central axis C1 (C2, C3) of the ball bearing 10. As shown in FIG. Therefore, in this description, the point c is referred to as the "first end point" as well as the point a.
  • a point d is a point at which the second straight line L2 intersects the second most axial side of the first inclined surface 23 in a cross section including the central axis C2 of the outer ring 20.
  • a line segment whose endpoints are point c (first endpoint) and point d (third endpoint) will be referred to as a second line segment cd.
  • the second line segment cd is part of the second straight line L2.
  • the points c and d are out of phase by 180°.
  • the phase of point c is the same as the phase of point a
  • the phase of point d is the same as the phase of point b.
  • the ball bearing 10 is formed by combining an inner ring assembly 35 and an outer ring 20 .
  • a plurality of first balls 41 are arranged to roll on the first outer ring raceway 21 .
  • a plurality of second balls 42 are arranged to roll on the second outer ring raceway 22 .
  • the nominal contact point of the first inner ring raceway 31 is located on the second axial side of the nominal contact point of the first outer ring raceway 21 .
  • the nominal contact point of the second inner ring raceway 32 is located on the second axial side of the nominal contact point of the second outer ring raceway 22 .
  • the side surface on the first axial side of the inner ring 30 is the front surface of the inner ring 30
  • the side surface on the second axial side of the inner ring 30 is the rear surface of the inner ring 30
  • the side surface of the outer ring 20 on the first side in the axial direction is the back side of the outer ring 20
  • the side surface on the second side in the axial direction of the outer ring 20 is the front side of the outer ring 20 .
  • FIG. 6 is a cross-sectional view showing how the outer ring is assembled to the inner ring assembly of the ball bearing according to the first embodiment.
  • FIG. 6 shows a first ball bearing 10A, which is the ball bearing 10 according to the first embodiment.
  • the first ball bearing 10A has a first outer ring 20A which is the outer ring 20 according to the first embodiment.
  • the first outer ring raceway 21 in the first outer ring 20A is referred to as the first outer ring raceway 21A
  • the second outer ring raceway 22 as the second outer ring raceway 22A
  • the first inclined surface 23 as the first outer ring raceway 21A.
  • the inclined surface 23A and the second inclined surface 24 are called a second inclined surface 24A, and the third inclined surface 25 is called a third inclined surface 25A, respectively.
  • 10 A of 1st ball bearings are also simply called 10 A of ball bearings
  • 20 A of 1st outer rings are also simply called 20 A of outer rings.
  • the length of line segment ab is greater than the length of line segment cd.
  • the first outer ring 20A and inner ring assembly 35 shown in FIG. 6 have a point a (first end point) and a point c (second 1) are aligned with each other.
  • the inner ring assembly 35 is rotated about the tangent line of the second great circle BC2 passing through the point a (first end point) from this state, the length of the first line segment ab becomes the length of the line segment cd.
  • the first ball 41 on the first side in the radial direction cannot enter the first inclined surface 23A.
  • the first outer ring 20A and the inner ring assembly 35 are combined in a state where the central axis C3 of the inner ring 30 is inclined with respect to the central axis C2 of the first outer ring 20A. difficult to attach. Therefore, when assembling the first outer ring 20A to the inner ring assembly 35, there is a low possibility that the first ball 41 will come into contact with the first inclined surface 23A and be caught. That is, in the first ball bearing 10A having such a configuration, when the central axis C3 of the inner ring 30 is inclined with respect to the central axis C2 of the first outer ring 20A, the first outer ring 20A and the inner ring group Assembling the solid 35 is difficult.
  • FIG. 7 is a cross-sectional view showing the overall configuration of a ball bearing according to the second embodiment.
  • FIG. 8 is a cross-sectional view showing an outer ring according to the second embodiment.
  • FIG. 9 is a cross-sectional view showing how the outer ring is attached to the inner ring assembly of the ball bearing according to the second embodiment.
  • FIG. 7 shows a second ball bearing 10B, which is the ball bearing 10 according to the second embodiment.
  • the second ball bearing 10B differs from the first ball bearing 10A in that it has a second outer ring 20B (see FIG. 8) which is the outer ring 20 according to the second embodiment.
  • the first outer ring raceway 21 of the second outer ring 20B is referred to as the first outer ring raceway 21B
  • the second outer ring raceway 22 is referred to as the second outer ring raceway 22B
  • the first inclined surface 23 is referred to as the first outer ring raceway 21B
  • the inclined surface 23B and the second inclined surface 24 are called a second inclined surface 24B
  • the third inclined surface 25 is called a third inclined surface 25B.
  • the second ball bearing 10B is also simply called the ball bearing 10B
  • the first outer ring 20A is also simply called the outer ring 20B.
  • a point e is defined for convenience of explanation (see FIG. 8).
  • a point e (fourth end point) is a point located on the first inclined surface 23 on the first side in the radial direction in a cross section including the central axis C2 of the second outer ring 20B. 1st end point) is the shortest point.
  • a line segment having point c (first end point) and point e (fourth end point) as end points will be referred to as a third line segment ce.
  • the points c and e are out of phase by 180°.
  • the phase of point e is the same as the phase of point d.
  • the length of the first line segment ab is shorter than the length of the second line segment cd and shorter than the length of the third line segment ce.
  • the second outer ring 20B and inner ring assembly 35 shown in FIG. 9 have a point a (first end point) and a point c (second 1) are aligned with each other.
  • the inner ring assembly 35 is rotated about the tangent line of the second great circle BC2 passing through the point a (first end point) from this state, the first ball 41 enters the first inclined surface 23B. and can enter the first outer ring raceway 21B beyond the first inclined surface 23B. That is, in the second ball bearing 10B, when the second outer ring 20B is assembled to the inner ring assembly 35, the first balls 41 are less likely to be caught in contact with the first inclined surface 23B.
  • the second outer ring 20B and the inner ring assembly are arranged in a state in which the central axis C3 of the inner ring 30 is inclined with respect to the central axis C2 of the second outer ring 20B. Even if the three-dimensional body 35 is assembled, it can be easily assembled without being caught. In addition, since the possibility that the second outer ring 20B is caught by the inner ring assembly 35 is low, it is difficult to force the second outer ring 20B into the inner ring assembly 35. It is possible to reduce the possibility of being scratched by rubbing against 23B. Therefore, it can be evaluated that the second ball bearing 10B is excellent in assembling performance.
  • FIG. 10 is a cross-sectional view showing the overall configuration of a ball bearing according to a comparative example.
  • FIG. 11 is a cross-sectional view showing an outer ring according to a comparative example.
  • FIG. 12 is a cross-sectional view showing how the outer ring is attached to the inner ring assembly of the ball bearing according to the comparative example.
  • a ball bearing 60 shown in FIG. 10 differs from the ball bearing 10 of the present disclosure in that it has an outer ring 70 .
  • the ball bearing 60 includes an inner ring assembly 35 in common with the ball bearing 10 of the present disclosure.
  • the central axis of the ball bearing 60 will be referred to as central axis C4.
  • the central axis of the outer ring 70 is called central axis C5
  • the central axis of the inner ring 30 is called central axis C3.
  • the central axis C5 of the outer ring 70 and the central axis C3 of the inner ring 30 coincide with the central axis C4 of the ball bearing 60 in which the inner ring assembly 35 and the outer ring 70 are combined.
  • the inner peripheral surface of the outer ring 70 has a first inclined surface 73, a second inclined surface 74, a first inclined surface 73, a second inclined surface 74, a first outer ring raceway 71 and a second outer ring raceway 72. and a third inclined surface 75 are formed.
  • the first inclined surface 73 is formed on the inner peripheral surface of the outer ring 70 on the second side in the axial direction of the first outer ring raceway 71 and has a diameter that increases from the first side in the axial direction toward the second side. It is a conical surface that The second inclined surface 74 is formed on the second axial side of the first inclined surface 73 on the inner peripheral surface of the outer ring 70 and on the first axial side of the second outer ring raceway 72, It is a conical surface that expands in diameter from a first axial side toward a second axial side.
  • the third inclined surface 75 is formed on the inner peripheral surface of the outer ring 70 on the axial second side of the second outer ring raceway 72 , adjoins the front surface of the outer ring 70 , and extends from the axial first side to the third axial side. It is a conical surface that expands toward the side of 2.
  • a first minor angle ⁇ 101 formed between the first inclined surface 73 and the central axis C5 of the outer ring 70 in the cross section including the central axis C5 of the outer ring 70 is the second inclined surface in the cross section including the central axis C5 of the outer ring 70. 74 and the central axis C5 of the outer ring 70 is smaller than the second minor angle ⁇ 102.
  • first minor angle ⁇ 101 is smaller than third minor angle ⁇ 103 formed by third inclined surface 75 and central axis C5 of outer ring 70 .
  • points d and e similar to those of the second outer ring 20B (see FIG. 8) are defined (see FIG. 11).
  • the length of the first line segment ab is shorter than the length of the second line segment cd and longer than the length of the third line segment ce.
  • the ball bearing 60 differs from the ball bearing 10 (the first ball bearing 10A and the second ball bearing 10B) of the present disclosure in that it has such a dimensional relationship.
  • a ball bearing 60 according to a comparative example is not included in the ball bearing 10 of the present disclosure.
  • the outer ring 70 and the inner ring assembly 35 shown in FIG. 12 have a point a (first end point) and a point c (first end point) in a cross section including the central axis C5 of the outer ring 70 and the central axis C3 of the inner ring 30. are placed in a matching manner.
  • the inner ring assembly 35 is rotated about the tangent line of the second great circle BC2 passing through the point a (first end point) from this state, the first ball 41 on the first side in the radial direction Although it can enter the first inclined surface 73 , it cannot go over the first inclined surface 73 and enter the first outer ring raceway 71 .
  • the ball bearing 60 when the outer ring 70 is assembled to the inner ring assembly 35, the first ball 41 may come into contact with the first inclined surface 73 and be caught. Further, if the outer ring 70 in the hooked state is forcibly pushed into the inner ring assembly 35, the first ball 41 may rub against the first inclined surface 73 and be damaged. For this reason, the ball bearing 60 can be evaluated as having poor assembling properties.
  • the ball bearings 10A, 10B in the embodiments described above include an inner ring assembly 35 and outer rings 20A, 20B.
  • the inner ring assembly 35 includes an inner ring 30 , a plurality of first balls 41 , a plurality of second balls 42 , a first retainer 51 and a second retainer 52 .
  • the inner ring 30 has a first inner ring raceway 31 on the first side in the axial direction and a second inner ring raceway 32 on the second side in the axial direction of the first inner ring raceway 31 on its outer peripheral surface. There is The raceway contact diameter of the first inner ring raceway 31 is smaller than the raceway contact diameter of the second inner ring raceway 32 .
  • a plurality of first balls 41 are arranged to roll on the first inner ring raceway 31 .
  • the first retainer 51 has a plurality of first pockets 53 .
  • the plurality of first balls 41 are slidably arranged in the first pocket 53 .
  • a plurality of second balls 42 are arranged to roll on the second inner ring raceway 32 .
  • the second retainer 52 has a plurality of second pockets 54 .
  • a plurality of second balls 42 are slidably disposed in the second pocket 54 .
  • the inner ring 30, the plurality of first balls 41, the plurality of second balls 42, the first retainer 51, and the second retainer 52 are configured so as not to separate.
  • the pitch diameter of the ball set in the row of the first balls 41 formed by the plurality of first balls 41 of the inner ring assembly 35 is the same as the pitch diameter of the balls in the row of the second balls 42 formed by the plurality of second balls 42. Smaller than the pitch diameter of the set.
  • the outer rings 20A, 20B have first outer ring raceways 21A, 21B, first inclined surfaces 23A, 23B, and second inclined surfaces 24A, 24B from the first side in the axial direction to the second side. , and second outer ring raceways 22A and 22B on the inner peripheral surface.
  • the inner peripheral surfaces of the outer rings 20A, 20B expand from the first outer ring raceways 21A, 21B to the second outer ring raceways 22A, 22B without decreasing in diameter, and the raceway contact diameters of the first outer ring raceways 21A, 21B are , is smaller than the raceway contact diameter of the second outer ring raceway 22A, 22B.
  • the diameter of the plurality of first balls 41 is smaller than the diameter of the plurality of second balls 42 .
  • a plurality of first balls 41 are arranged so as to be able to roll on the first outer ring raceways 21A and 21B.
  • a plurality of second balls 42 are arranged so as to be able to roll on the second outer ring raceways 22A and 22B.
  • the nominal contact point of the first inner ring raceway 31 is located on the second side in the axial direction from the nominal contact point of the first outer ring raceways 21A, 21B.
  • the nominal contact point of the second inner ring raceway 32 is located on the second side in the axial direction from the nominal contact point of the second outer ring raceways 22A, 22B.
  • the first inclined surfaces 23A, 23B are formed on the second side in the axial direction of the first outer ring raceways 21A, 21B on the inner peripheral surfaces of the outer rings 20A, 20B. It is an inclined surface that expands in diameter toward the side.
  • the second inclined surfaces 24A, 24B are located on the second side in the axial direction of the first inclined surfaces 23A, 23B on the inner peripheral surfaces of the outer rings 20A, 20B and in the axial direction of the second outer ring raceways 22A, 22B. It is an inclined surface formed on the first side and increasing in diameter from the first side toward the second side in the axial direction.
  • a first minor angle ⁇ 1 formed by the first inclined surfaces 23A, 23B and the central axis C2 of the outer rings 20A, 20B in a cross section including the central axis C2 of the outer rings 20A, 20B includes the central axis C2 of the outer rings 20A, 20B.
  • the center of each first ball 41 of the plurality of first balls 41 is on the first great circle BC1
  • the half of the diameter of the first ball 41 is defined as the first small radius Sr1, which is the radius of the first small circle SC1
  • the half of the pitch diameter of the ball set in the row of the first balls 41 is defined as the diameter of the first great circle BC1.
  • a torus having a first major radius Br1, which is a radius, is defined as a first virtual torus T1.
  • the second small radius Sr2 which is the radius of the second small circle SC2 is half the diameter of the second ball 42, and the half of the pitch diameter of the ball set in the row of the second balls 42 is the second great circle BC2.
  • a torus having a second large radius Br2, which is a radius, is defined as a second virtual torus T2. In a cross section including the bearing central axis C1, a radial first side and a radial second side opposite to the radial first side by 180° in the circumferential direction are defined.
  • a second great circle BC2 on the second side as the first end points a, c, a first great circle BC1 on the first radial side and a second great circle BC2 on the second radial side and the surface of the first imaginary torus T1 on the first side in the radial direction.
  • the line segment connecting c and the second end point b is defined as a first line segment ab
  • the second most axial side of the first inclined surfaces 23A and 23B on the first side in the radial direction is defined as the third side.
  • a line segment connecting the first end points a and c and the third end point d is defined as a second line segment cd, which lies on the first inclined surfaces 23A and 23B on the first side in the radial direction.
  • a point closest to the first end points a and c is defined as a fourth end point e
  • a line segment connecting the first end points a and c and the fourth end point e is defined as a third line segment ce.
  • the length of the first line segment ab is greater than the length of the second line segment cd (in the case of the outer ring 20A), or the length of the first line segment ab is greater than the length of the second line segment cd. It is smaller than the length of the line segment cd, and the length of the first line segment ab is smaller than the length of the third line segment ce (in the case of the outer ring 20B).
  • the ball bearings 10A and 10B having such a configuration, when the outer ring 20 is assembled to the inner ring assembly 35, the first balls 41 do not come into contact with the first inclined surface 23 of the outer ring 20. It is possible to prevent the outer ring 20 from being caught and stopped in a state where the first ball 41 is in contact with the inclined surface 23 of . Therefore, according to the ball bearings 10A and 10B shown in the above embodiment, it is possible to improve the assembling property of the outer ring 20 to the inner ring assembly 35 .
  • the outer rings 20A and 20B are provided with first outer ring raceways 21A and 21B and first inclined surfaces on the inner peripheral surface from the first side toward the second side in the axial direction. 23A, 23B, second inclined surfaces 24A, 24B, second outer ring raceways 22A, 22B, and third inclined surfaces 25A, 25B.
  • the inner peripheral surfaces of the outer rings 20A, 20B expand without decreasing in diameter from the first outer ring raceways 21A, 21B to the third inclined surfaces 25A, 25B.
  • the first minor angle ⁇ 1 is the third angle between the third inclined surfaces 25A, 25B and the central axes C2 of the outer rings 20A, 20B in the cross section containing the central axes C2 of the outer rings 20A, 20B. It is smaller than the minor angle ⁇ 3. According to the ball bearings 10A and 10B having such a configuration, it is possible to improve the assembling property of the outer ring 20 to the inner ring assembly 35 .
  • the plurality of second balls 42 and a virtual plane including the front surfaces of the second sides of the outer rings 20A and 20B in the axial direction and perpendicular to the central axes of the outer rings 20A and 20B are: They overlap in the axial direction.
  • the assembly of the outer rings 20A and 20B to the inner ring assembly 35 can be improved. can.

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

Abstract

Roulement à billes (10) dans lequel, dans une section transversale comprenant un axe central (C2), un premier angle inférieur (θ1) formé par une première surface inclinée (23) et l'axe central (C2) est inférieur à un second angle inférieur (θ2) formé par une seconde surface inclinée (24) et l'axe central (C2) et, dans une section transversale comprenant un axe central (C1), lorsqu'un second grand cercle (BC2) sur un second côté dans la direction radiale est un premier point d'extrémité (a, c), une intersection entre une première ligne droite (L1) passant à travers un premier grand cercle (BC1) sur le premier côté dans la direction radiale et le second grand cercle (BC2) sur le second côté dans la direction radiale et une surface d'un premier tore imaginaire (T1) sur un premier côté dans la direction radiale est un deuxième point d'extrémité (b), la première surface inclinée (23) sur le premier côté dans la direction radiale la plus proche d'un deuxième côté dans la direction axiale est un troisième point d'extrémité (d), et un point qui est sur la première surface inclinée (23) sur le premier côté dans la direction radiale et a la distance la plus courte du premier point d'extrémité (a) est un quatrième point d'extrémité (e), la longueur d'un premier segment de ligne (ab) est plus longue que la longueur d'un deuxième segment de ligne (cd) ou la longueur du premier segment de ligne (ab) est plus courte que la longueur d'un deuxième segment de ligne (cd) et la longueur du premier segment de ligne (ab) est plus courte que la longueur d'un troisième segment de ligne (ce).
PCT/JP2022/000639 2022-01-12 2022-01-12 Roulement à billes WO2023135667A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/JP2022/000639 WO2023135667A1 (fr) 2022-01-12 2022-01-12 Roulement à billes

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007278324A (ja) * 2006-04-03 2007-10-25 Jtekt Corp ピニオン軸支持用複列転がり軸受およびこれを備えた転がり軸受装置
JP2014040870A (ja) * 2012-08-23 2014-03-06 Nsk Ltd タンデム型複列アンギュラ玉軸受
KR20170131975A (ko) * 2016-05-23 2017-12-01 주식회사 베어링아트 텐덤 앵귤러 콘택트 볼 베어링 및 그 조립 방법

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007278324A (ja) * 2006-04-03 2007-10-25 Jtekt Corp ピニオン軸支持用複列転がり軸受およびこれを備えた転がり軸受装置
JP2014040870A (ja) * 2012-08-23 2014-03-06 Nsk Ltd タンデム型複列アンギュラ玉軸受
KR20170131975A (ko) * 2016-05-23 2017-12-01 주식회사 베어링아트 텐덤 앵귤러 콘택트 볼 베어링 및 그 조립 방법

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