WO2024018576A1 - Dispositif de palier et procédé de fabrication associé - Google Patents

Dispositif de palier et procédé de fabrication associé Download PDF

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Publication number
WO2024018576A1
WO2024018576A1 PCT/JP2022/028290 JP2022028290W WO2024018576A1 WO 2024018576 A1 WO2024018576 A1 WO 2024018576A1 JP 2022028290 W JP2022028290 W JP 2022028290W WO 2024018576 A1 WO2024018576 A1 WO 2024018576A1
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WO
WIPO (PCT)
Prior art keywords
outer ring
balls
raceway
bearing device
shaft
Prior art date
Application number
PCT/JP2022/028290
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English (en)
Japanese (ja)
Inventor
義孝 早稲田
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/JP2022/028290 priority Critical patent/WO2024018576A1/fr
Publication of WO2024018576A1 publication Critical patent/WO2024018576A1/fr

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Classifications

    • 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
    • F16C25/00—Bearings for exclusively rotary movement adjustable for wear or play
    • F16C25/06—Ball or roller bearings
    • F16C25/08—Ball or roller bearings self-adjusting
    • 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
    • F16C35/00—Rigid support of bearing units; Housings, e.g. caps, covers
    • F16C35/04—Rigid support of bearing units; Housings, e.g. caps, covers in the case of ball or roller bearings
    • F16C35/06—Mounting or dismounting of ball or roller bearings; Fixing them onto shaft or in housing
    • F16C35/063—Fixing them on the shaft
    • 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

  • the present invention relates to a technology for a bearing device and a method for manufacturing the same.
  • the bearing device includes a shaft having a first inner raceway, a gear (power transmission section), a second inner raceway, and a plurality of shafts, from a first axial side to a second axial side. It includes a first rolling element, a plurality of second rolling elements, a first outer ring having a first outer ring raceway, and a second outer ring having a second outer ring raceway.
  • a first rolling element is arranged between a first inner ring raceway and a first outer ring raceway
  • a second rolling element is arranged between a second inner ring raceway and a second outer ring raceway. Placed.
  • the bearing device is delivered to a user (as parts) without assembling the shaft, each rolling element, and each outer ring, and is assembled by the user.
  • the bearing device is assembled and then attached to the housing.
  • Such a bearing device is sometimes used with a preload applied thereto.
  • the user measures the assembly width after assembling the bearing device.
  • the "assembly width" here refers to the distance between the back surface of the first outer ring located on the first axial side and the back surface of the second outer ring located on the second axial side.
  • the assembly width is the sum of the axial dimensions and axial clearances of the shaft, each rolling element, and each outer ring. Since the axial dimension includes tolerances, the assembly width differs for each individual. Therefore, the user needs to measure the assembly width of each individual bearing device. It takes time for the user to assemble the bearing device and measure the assembly width.
  • the present disclosure includes a shaft including a first inner raceway, a power transmission section, and a second inner raceway from a first side to a second side in the axial direction; a plurality of first balls; It is an object of the present invention to reduce a user's effort in a bearing device including a plurality of second balls, a first outer ring, and a second outer ring.
  • the bearing device of the present disclosure includes a shaft, a plurality of first balls, a plurality of second balls, a first outer ring, and a second outer ring, and the shaft has a first from the side toward the second side in the axial direction: a first shoulder, a first inner raceway, a second shoulder, a power transmission section, a third shoulder, a second inner raceway, and a fourth shoulder.
  • the first outer ring has a first front surface and a first back surface at the axial end, and a first outer ring raceway on the radially inner side
  • the second outer ring has a first outer ring raceway on the inner side in the radial direction.
  • the plurality of first balls are arranged between the first inner ring raceway and the second outer ring raceway.
  • the plurality of second balls are rollably arranged between the second inner ring raceway and the second outer ring raceway, and the plurality of second balls are rollably arranged between the second inner ring raceway and the second outer ring raceway.
  • the shaft, the plurality of first balls, and the first outer ring are assembled so as not to separate, and the shaft, the plurality of second balls, and the second outer ring are assembled so as not to separate.
  • the first front surface is located on a second axial side opposite to the power transmission section, and the first back surface is located on a second axial side opposite to the power transmission section. 1 side, the second front is located on the first side in the axial direction opposite to the power transmission section, and the second back surface is located on the opposite side to the power transmission section. Located on the second axial side.
  • FIG. 1 is a schematic cross-sectional view showing a first embodiment of a bearing device of the present disclosure.
  • FIG. 3 is a schematic cross-sectional view showing the bearing device in a state where it is attached to a housing and a preload is applied. It is a cross-sectional schematic diagram showing an axis.
  • FIG. 3 is a schematic cross-sectional view showing the first outer ring.
  • FIG. 3 is a schematic cross-sectional view showing the second outer ring.
  • FIG. 3 is a schematic cross-sectional view showing a second embodiment of the bearing device of the present disclosure. It is a cross-sectional schematic diagram which shows the modification of an outer ring and a cage.
  • FIG. 3 is a schematic cross-sectional view showing the modification of an outer ring and a cage.
  • FIG. 2 is a schematic cross-sectional view of a bearing device having an outer ring in which a resin member is arranged.
  • FIG. 2 is a block diagram of a calculation device.
  • FIG. 2 is a flow diagram illustrating a method for manufacturing a bearing device according to the present disclosure.
  • FIG. 3 is an explanatory diagram of a recording section and a recording medium in the bearing device of the present disclosure.
  • the bearing device of the present disclosure includes a shaft including a first inner raceway, a power transmission section, a second inner raceway, and a plurality of shafts arranged from a first axial side to a second axial side.
  • the first rolling element, the plurality of second rolling elements, the first outer ring, and the second outer ring can be delivered to a user in an assembled state. Therefore, in the bearing device of the present disclosure, the user does not need to assemble the bearing device, which can reduce the user's effort.
  • the bearing device 10 of the present disclosure includes a shaft 20, a plurality of first balls 31, a plurality of second balls 32, a first outer ring 41, and a second outer ring 42.
  • the shaft 20 has a first shoulder 21, a first inner ring raceway 22, a second shoulder 23, a power transmission section 24, and a third shoulder 21, from a first axial side to a second axial side. It has a shoulder 25, a second inner raceway 26, and a fourth shoulder 27.
  • the first outer ring 41 has a first front face 41a and a first back face 41b at the ends in the axial direction, and a first outer ring raceway 43 on the inner side in the radial direction.
  • the second outer ring 42 has a second front face 42a and a second back face 42b at the ends in the axial direction, and a second outer ring raceway 44 on the inner side in the radial direction.
  • the plurality of first balls 31 are rotatably arranged between the first inner raceway 22 and the first outer raceway 43.
  • the plurality of second balls 32 are rotatably arranged between the second inner raceway 26 and the second outer raceway 44 .
  • the bearing device 10 is assembled so that the shaft 20, the plurality of first balls 31, and the first outer ring 41 are not separated.
  • the bearing device 10 is assembled so that the shaft 20, the plurality of second balls 32, and the second outer ring 42 are not separated.
  • the first front face 41a is located on the second axial side facing the power transmission unit 24, and the first back face 41b is located on the first axial side opposite to the power transmission unit 24.
  • the second front face 42a is located on a first axial side facing the power transmission unit 24, and the second back face 42b is located on a second axial side opposite to the power transmission unit 24.
  • the bearing device 10 of the present disclosure includes a shaft 20 including a first inner raceway 22, a power transmission section 24, and a second inner raceway 26 from a first side to a second side in the axial direction;
  • the plurality of first balls 31, the plurality of second balls 32, the first outer ring 41, and the second outer ring 42 are delivered to the user in an assembled state. Therefore, the user does not need to assemble the bearing device 10, and the user's effort can be reduced.
  • the bearing device 10 of the present disclosure preferably further includes the first back surface 41b and the second back surface 42b when a predetermined preload F is applied between the first back surface 41b and the second back surface 42b.
  • a recording unit 61 or a recording medium 62 is provided on which the second assembly width LY, which is the value of the distance to the back surface 42b, is recorded.
  • the method for manufacturing the bearing device 10 of the present disclosure provides a method for manufacturing the first outer ring 41 with respect to the axial distance between the first reference point P1 of the first outer ring raceway 43 and the first back surface 41b.
  • a fifth step S5 is to grasp the relationship between the second outer ring raceway 44 and the second The first assembled width LX, which is the distance between the first back surface 41b and the second back surface 42b when the plurality of second balls 32 are arranged between the inner ring raceway 26, is included in the predetermined distance range.
  • the first outer ring 41 and the second outer ring 42 are , a sixth step S6 of selecting at least one of the plurality of first balls 31, the plurality of second balls 32, and the shaft 20, and the selected first outer ring 41 and second outer ring 42, A seventh step S7 of assembling the plurality of first balls 31, the plurality of second balls 32, and the shaft 20 is included.
  • FIG. 1 is a schematic cross-sectional view showing a first embodiment of a bearing device of the present disclosure.
  • FIG. 2 is a schematic cross-sectional view showing the bearing device in a state where it is attached to a housing and a preload is applied.
  • the bearing device 10 shown in FIGS. 1 and 2 is a first embodiment of the bearing device of the present disclosure.
  • the bearing device 10 according to the first embodiment is also referred to as a first bearing device 11.
  • the term "bearing device 10" when the term "bearing device 10" is simply referred to, it refers to the first bearing device 11 and the bearing device 10 (second bearing device 12, see FIG. 6) according to a second embodiment, which will be described later. This is an explanation of the common configuration.
  • the bearing device 10 of the present disclosure includes a shaft 20, a plurality of first balls 31, a plurality of second balls 32, a first retainer 33, a second retainer 34, a first outer ring 41, and a second An outer ring 42 is provided.
  • the central axis of the shaft 20 is the central axis C
  • one side of the central axis C in the axial direction is a first side
  • the other side in the axial direction is a second side.
  • the central axis of the bearing device 10 coincides with the central axis C of the shaft 20.
  • the direction perpendicular to the central axis C is the radial direction. Note that FIGS. 1 and 2 show cross sections taken along a plane passing through the central axis C (the same applies to FIGS. 3, 6 to 8, and 11, which will be described later).
  • FIG. 3 is a schematic cross-sectional view showing the axis.
  • the shaft 20 shown in FIGS. 1 to 3 is made of a mechanical structural alloy steel material such as chromium molybdenum steel, and has a cylindrical shape.
  • the shaft 20 has a first shoulder 21, a first inner ring raceway 22, a second shoulder 23, a first shaft portion 28, a power It has a transmission part 24, a second shaft part 29, a third shoulder 25, a second inner raceway 26, and a fourth shoulder 27.
  • the shape of the shaft 20 shown in the present disclosure is two-fold symmetrical about a specific line perpendicular to the axial center on the central axis C of the shaft 20.
  • the first shoulder 21 is a part of the outer peripheral surface of the shaft 20.
  • the first shoulder 21 is a cylindrical surface centered on the central axis C.
  • the first shoulder 21 extends from the first axial end of the shaft 20 to the second axial side.
  • the first inner raceway 22 is a raceway groove extending from the end of the first shoulder 21 on the second axial side to the second axial side.
  • the first inner raceway 22 extends radially inward from the first shoulder 21 and reaches a second shoulder 23 radially outwardly.
  • the first inner ring raceway 22 has a circular arc in a cross section including the central axis C of the shaft 20.
  • the second shoulder 23 is part of the outer peripheral surface of the shaft 20.
  • the second shoulder 23 is a cylindrical surface centered on the central axis C.
  • the second shoulder 23 extends from the end of the first inner ring raceway 22 on the second axial side to the second axial side.
  • the first shaft portion 28 extends from the second axial end of the second shoulder 23 to the second axial side.
  • the first shaft portion 28 is a part of the outer peripheral surface of the shaft 20.
  • the first shaft portion 28 is a cylindrical surface centered on the central axis C. The diameter of the first shank 28 is smaller than the diameter of the second shoulder 23.
  • the power transmission section 24 plays the role of transmitting power between the shaft 20 and elements other than the shaft 20. As shown in FIGS. 1 and 2, the power transmission section 24 is arranged on the shaft 20 on the second axial side of the second shoulder 23. As shown in FIGS. The power transmission section 24 in the first bearing device 11 is a gear 24a. The gear 24a meshes with another gear arranged on a shaft (not shown). The gear 24a transmits power to the other gear, or receives power from the other gear.
  • the bearing device 10 of the present disclosure exemplifies a bearing device having one power transmission section 24 (gear 24a in FIGS. 1 and 2) on the shaft 20; The bearing device may have a plurality of power transmission sections 24 on the bearing device 20 .
  • the bearing device 10 of the present disclosure exemplifies a bearing device having a power transmission section 24 (gear 24a) that is integrated with the shaft 20; It may have. In this case, it is preferable that the shaft 20 and the power transmission section 24 (gear 24a) are fitted onto separate shafts using splines.
  • the second shaft portion 29 extends from the end of the power transmission portion 24 on the second axial side to the second axial side.
  • the second shaft portion 29 is a part of the outer peripheral surface of the shaft 20.
  • the second shaft portion 29 is a cylindrical surface centered on the central axis C.
  • the diameter of the second shank 29 is smaller than the diameter of the third shoulder 25.
  • the third shoulder 25 is a part of the outer peripheral surface of the shaft 20.
  • the third shoulder 25 is a cylindrical surface centered on the central axis C.
  • the third shoulder 25 extends from the power transmission section 24 to the second side in the axial direction.
  • the second inner raceway 26 is a raceway groove extending from the end of the third shoulder 25 on the second axial side to the second axial side.
  • the second inner raceway 26 extends radially inward from the third shoulder 25 and reaches a fourth shoulder 27 radially outward.
  • the second inner ring raceway 26 has a circular arc in a cross section including the central axis C of the shaft 20.
  • the fourth shoulder 27 is part of the outer peripheral surface of the shaft 20.
  • the fourth shoulder 27 is a cylindrical surface centered on the central axis C.
  • the fourth shoulder 27 extends from the end of the second inner ring raceway 26 on the second axial side to the second axial side.
  • the fourth shoulder 27 extends from the second axial end of
  • the center of the raceway groove of the first inner ring raceway 22 is a third reference point P3 located on the outside of the shaft 20 in the radial direction.
  • the raceway groove radius of the first inner raceway 22 is radius R3.
  • the center of the raceway groove of the second inner ring raceway 26 is a fourth reference point P4 located on the outside of the shaft 20 in the radial direction.
  • the raceway groove radius of the second inner raceway 26 is radius R4.
  • the third distance L3 is the distance in the axial direction between the third reference point P3 and the fourth reference point P4.
  • the diameter of the first shaft portion 28 and the second shaft portion 29 of the shaft 20 is the diameter D3.
  • the first shaft portion 28 and the second shaft portion 29 are the portions of the shaft 20 that have the smallest diameters.
  • FIG. 4 is a schematic cross-sectional view showing the first outer ring. Note that FIG. 4 partially shows a cross section taken along a plane passing through the central axis C1 of the first outer ring 41.
  • the first outer ring 41 shown in FIG. 4 is made of a steel material such as high carbon chromium bearing steel, carbon steel, or alloy steel, and has a cylindrical shape.
  • the first outer ring 41 has a first front surface 41a and a first back surface 41b at the ends in the axial direction.
  • the first front surface 41a of the first outer ring 41 is arranged on the second axial side, and the first back surface 41b of the first outer ring 41 is arranged on the first axial side. Placed.
  • the inner circumferential surface of the first outer ring 41 has a second cylindrical surface 41e, a first outer ring raceway 43, and a first cylindrical surface from the first axial side to the second axial side. It has a surface 41d and a first inclined surface 41c.
  • the outer peripheral surface of the first outer ring 41 is a bearing outer diameter surface.
  • the first side in the axial direction is the first back surface 41b side of the first outer ring 41.
  • the second side in the axial direction is the first front surface 41a side of the first outer ring 41.
  • the second cylindrical surface 41e is a cylindrical surface extending from the first back surface 41b to the second side in the axial direction.
  • the second cylindrical surface 41e is a shoulder of the first outer raceway 43.
  • the first outer ring raceway 43 is a raceway groove extending from the end of the second axial side of the second cylindrical surface 41e to the second axial side.
  • the first outer ring raceway 43 extends from the second cylindrical surface 41e toward the outside in the radial direction and then toward the inside in the radial direction to reach the first cylindrical surface 41d.
  • the first outer ring raceway 43 is a combination of circular arcs in a cross section including the central axis C of the shaft 20.
  • the first cylindrical surface 41d is a cylindrical surface extending from the end of the first outer ring raceway 43 on the second axial side to the second axial side.
  • the first cylindrical surface 41d is a shoulder drop.
  • the first inclined surface 41c is a conical surface extending from the end of the first cylindrical surface 41d on the second axial side to the second axial side. The diameter of the first inclined surface 41c increases from the first cylindrical surface 41d toward the second side in the axial direction.
  • the first cylindrical surface 41d is connected to the first front surface 41a.
  • the first outer ring raceway 43 has a first portion 43a and a second portion 43b.
  • the first portion 43a is a circular arc having a raceway groove radius R1 in a cross section including the central axis C.
  • the second portion 43b is an arc having a raceway groove radius R2 in a cross section including the central axis C.
  • the raceway groove radius R1 of the first portion 43a is different from the raceway groove radius R2 of the second portion 43b.
  • the tangent at the intersection P5 of the first portion 43a with the second portion 43b and the tangent at the intersection P5 of the second portion 43b with the first portion 43a are the same straight line. It is above.
  • An intersection point P5 between the first portion 43a and the second portion 43b is on the circle with the largest diameter of the first outer ring raceway 43.
  • the first portion 43a extends from the end of the first axial side of the first cylindrical surface 41d to the first axial side and the outer side in the radial direction.
  • the second portion 43b extends from the intersection P5 with the first portion 43a toward the first side in the axial direction and inward in the radial direction to the second cylindrical surface 41e.
  • the radius R1 of the first portion 43a is larger than the radius R2 of the second portion 43b. Note that the radius of curvature R1 of the first portion 43a does not need to be constant, and may increase as it goes from the first side to the second side in the axial direction.
  • the first bearing outer diameter Dr1 is the diameter of the bearing outer diameter surface of the first outer ring 41.
  • the first reference point P1 is the center of the arc of the second portion 43b.
  • the first distance L1 is the distance in the axial direction between the first back surface 41b of the first outer ring 41 and the first reference point P1.
  • FIG. 5 is a schematic cross-sectional view showing the second outer ring. Note that FIG. 5 partially shows a cross section taken along a plane passing through the central axis C2 of the second outer ring 42.
  • the second outer ring 42 shown in FIG. 5 has the same shape as the first outer ring 41, and is used in an attitude in which the axial direction is opposite to that of the first outer ring 41.
  • the second outer ring 42 is made of a steel material such as high carbon chromium bearing steel, carbon steel, or alloy steel, and has a cylindrical shape.
  • the second outer ring 42 has a second front surface 42a and a second back surface 42b at the ends in the axial direction.
  • the second front surface 42a of the second outer ring 42 is arranged on the first axial side, and the second back surface 42b of the second outer ring 42 is arranged on the second axial side. Placed.
  • the inner circumferential surface of the second outer ring 42 has, from the first axial side toward the second axial side, a second inclined surface 42c, a third cylindrical surface 42d, and a second outer ring. It has a track 44 and a fourth cylindrical surface 42e.
  • the outer peripheral surface of the second outer ring 42 is a bearing outer diameter surface.
  • the first side in the axial direction is the second front 42a side of the second outer ring 42.
  • the second side in the axial direction is the second back surface 42b side of the second outer ring 42.
  • the second inclined surface 42c is a conical surface extending from the second front surface 42a to the first side in the axial direction.
  • the diameter of the second inclined surface 42c decreases from the second front surface 42a toward the second side in the axial direction.
  • the third cylindrical surface 42d is a cylindrical surface extending from the second end of the second inclined surface 42c to the second side in the axial direction.
  • the third cylindrical surface 42d is a shoulder drop.
  • the second outer ring raceway 44 extends from the third cylindrical surface 42d radially outward and radially inward to reach the fourth cylindrical surface 42e.
  • the second outer ring raceway 44 is a combination of circular arcs in a cross section including the central axis C of the shaft 20.
  • the fourth cylindrical surface 42e is a cylindrical surface extending from the end of the second outer ring raceway 44 on the second axial side to the second axial side.
  • the fourth cylindrical surface 42e is a shoulder of the second outer raceway 44.
  • the fourth cylindrical surface 42e is connected to the second back surface 42b.
  • the second outer ring raceway 44 has a third portion 44a and a fourth portion 44b.
  • the third portion 44a is an arc having a raceway groove radius R3 in a cross section including the central axis C.
  • the fourth portion 44b is a circular arc having a raceway groove radius R4 in a cross section including the central axis C.
  • the raceway groove radius R3 of the third portion 44a is different from the raceway groove radius R4 of the fourth portion 44b.
  • the tangent at the intersection P6 of the third portion 44a with the fourth portion 44b and the tangent at the intersection P6 of the fourth portion 44b with the third portion 44a are the same straight line. It is above.
  • An intersection point P6 between the third portion 44a and the fourth portion 44b is on the circle with the largest diameter of the second outer ring raceway 44.
  • the third portion 44a extends from the end of the second axial side of the third cylindrical surface 42d to the second axial side and to the outside in the radial direction.
  • the fourth portion 44b extends from the intersection P6 with the third portion 44a to the second axial side and radially inward to the fourth cylindrical surface 42e.
  • the radius R3 of the third portion 44a is larger than the radius R4 of the fourth portion 44b. Note that the radius of curvature R3 of the third portion 44a does not need to be constant, and may increase as it goes from the second side to the first side in the axial direction.
  • the second bearing outer diameter Dr2 is the diameter of the bearing outer diameter surface of the second outer ring 42.
  • the second reference point P2 is the center of the arc of the fourth portion 44b.
  • the first distance L1 is the distance in the axial direction between the second back surface 42b of the second outer ring 42 and the second reference point P2.
  • the first ball 31 shown in FIGS. 1 and 2 is made of a steel material such as high carbon chromium bearing steel. As shown in FIGS. 1 and 2, the plurality of first balls 31 are rotatably held in a toroidal space formed between the first inner raceway 22 and the first outer raceway 43. .
  • the diameter Db1 of the first ball is the diameter of the first ball 31.
  • the first cylindrical surface 41d of the first outer ring 41 has the first It is located radially inside compared to the outermost end of the ball 31.
  • the first portion 43a of the first outer ring raceway 43 contacts the first ball 31, so that the first outer ring 41 is displaced in the axial direction. displacement to the first side is restricted. Therefore, the first outer ring 41 does not fall off toward the first side in the axial direction due to the plurality of first balls 31.
  • the second ball 32 is made of steel such as high carbon chromium bearing steel. As shown in FIGS. 1 and 2, the plurality of second balls 32 are rotatably held in a toroidal space formed between the second inner raceway 26 and the second outer raceway 44. . In the following description, the diameter Db2 of the second ball is the diameter of the second ball 32.
  • the third cylindrical surface 42d of the second outer ring 42 The ball 32 is located radially inward compared to the outermost end of the ball 32.
  • the third portion 44a of the second outer ring raceway 44 contacts the second ball 32, so that the second outer ring 42 is displaced in the axial direction. displacement to the second side is restricted. Therefore, the second outer ring 42 is prevented from falling off to the second side in the axial direction due to the plurality of second balls 32.
  • the first cage 33 shown in FIGS. 1 and 2 is a crown-shaped cage.
  • the first retainer 33 is made of synthetic resin such as polyamide resin, polyphenylene sulfide resin, or phenol resin.
  • the first retainer 33 has an annular body 33a and a plurality of rings 33b.
  • the annular body 33a is located on the first side of the first ball 31 in the axial direction.
  • the two 33b are provided extending from the annular body 33a to the second side in the axial direction.
  • the plurality of pieces 33b are arranged at equal intervals in the circumferential direction of the annular body 33a.
  • the area between the circumferentially adjacent pairs 33b, 33b is a plurality of pockets that hold the first balls 31.
  • the second cage 34 shown in FIGS. 1 and 2 is a crown-shaped cage.
  • the second retainer 34 is made of synthetic resin such as polyamide resin, polyphenylene sulfide resin, or phenol resin.
  • the second retainer 34 has an annular body 34a and a plurality of rings 34b.
  • the annular body 34a is located on the second side of the second ball 32 in the axial direction.
  • the two 34b are provided extending from the annular body 34a to the first side in the axial direction.
  • the plurality of pieces 34b are arranged at equal intervals in the circumferential direction of the annular body 34a.
  • the area between the circumferentially adjacent ones 34b, 34b is a plurality of pockets that hold the second balls 32.
  • the bearing device 10 includes a plurality of first balls 31, a plurality of second balls 32, a first outer ring 41, and a second outer ring 42 with respect to the shaft 20. It has an assembled and integrated state.
  • the bearing device 10 is assembled and integrally configured as shown in FIG. 1, and is delivered to a user.
  • the first assembly width LX is the distance between the first back surface 41b of the first outer ring 41 and the second back surface 42b of the second outer ring It is.
  • the first assembly width LX is a distance at a determined temperature.
  • the first assembly width LX is such that the first back surface 41b and the second back surface 42b are pushed in the axial direction, the second portion 43b and the first balls 31 come into contact, and the first inner raceway 22 and the first ball 31 contact, the second inner raceway 26 and the second ball 32 contact, the fourth portion 44b and the second ball 32 contact, and the second portion 43b, the first ball 31, the first inner raceway 22, the second inner raceway 26, the second ball 32, and the fourth portion 44b are not substantially elastically deformed, and a preload is applied to the bearing device 10. This is the inter-plane distance between the first back surface 41b and the second back surface 42b in a state in which they are not in contact with each other.
  • the bearing device 10 has a first outer ring 41 fixed to a first housing 81, a second outer ring 42 fixed to a second housing 82, and a preload F applied thereto. used in the state.
  • the first housing 81 is fixed to the second housing 82 by, for example, screwing.
  • the second assembly width LY is defined as the width between the first back surface 41b of the first outer ring 41 and the second back surface 42b of the second outer ring 42 of the bearing device 10 in the used state shown in FIG. It is distance.
  • the second assembly width LY is the distance at a determined temperature.
  • the second assembly width LY is such that the first back surface 41b and the second back surface 42b are pushed in the axial direction, the second portion 43b and the first balls 31 come into contact, and the first inner raceway 22 and the first ball 31 contact, the second inner raceway 26 and the second ball 32 contact, the fourth portion 44b and the second ball 32 contact, and the second portion 43b, the first ball 31, the first inner raceway 22, the second inner raceway 26, the second ball 32, and the fourth portion 44b are elastically deformed, and a preload is applied to the bearing device 10. This is the inter-plane distance between the first back surface 41b and the second back surface 42b in the state.
  • FIG. 6 is a schematic cross-sectional view showing a second embodiment of the bearing device of the present disclosure. Note that FIG. 6 shows a cross section taken on a plane passing through the central axis C. For convenience of explanation, only the end face shapes of the first outer ring 41 and the second outer ring 42 shown in FIG. 6 are shown.
  • the bearing device 10 shown in FIG. 6 is a second embodiment of the bearing device of the present disclosure.
  • the bearing device 10 according to the second embodiment is also referred to as a second bearing device 12.
  • the power transmission section 24 is a pulley 24b.
  • a V-belt is wound between the pulley 24b and another pulley provided on a shaft (not shown), and power is transmitted between the pulley 24b and the other pulley.
  • the power transmission section 24 is not limited to the gear 24a (see FIGS. 1 and 2), but may be the pulley 24b.
  • FIG. 7 is a schematic cross-sectional view showing a modification of the outer ring and cage.
  • the bearing device 10 of the present disclosure may use a first outer ring 41 shown in FIG. 7 .
  • the shape of the first outer ring raceway 43 is different from the shape of the first outer ring 41 shown in FIG. 3.
  • the first outer ring raceway 43 shown in FIG. 7 does not have the first portion 43a, and the first cylindrical surface 41d extends in the axial direction from the end on the second side in the axial direction of the second portion 43b. extending to the second side of the.
  • the first cylindrical surface 41d is located on a tangent to the second portion 43b.
  • the first cylindrical surface 41d is Compared to the position of the outermost end of the first ball 31 in the radial direction, it is located on the outside in the radial direction or at the same position in the radial direction. Therefore, in the bearing device 10 using the first outer ring 41 shown in FIG. 7, the displacement of the first outer ring 41 toward the first side in the axial direction is not restricted by the first balls 31.
  • the first retainer 33 When using the first outer ring 41 shown in FIG. 7, it is preferable to use the first retainer 33 having a convex portion 33c.
  • the first outer ring 41 and the first retainer 33 having the convex portion 33c shown in FIG. In the state in which the second cylindrical surface 41e of the first outer ring 41 is held between the first outer ring 41 and the second outer ring 41, the second cylindrical surface 41e of the first outer ring 41 is located on the inner side in the radial direction compared to the position of the outermost end of the convex portion 33c in the radial direction.
  • the first retainer 33 is a crown retainer.
  • the plurality of first balls 31 are each placed in a pocket of the first holder 33.
  • the first ball 31 does not come out of the pocket of the first retainer 33.
  • the first retainer 33 is not separated on the first axial side with respect to the shaft 20 .
  • the first outer ring 41 is restricted from being displaced toward the first side in the axial direction with respect to the shaft 20 by the convex portion 33c. Therefore, the first outer ring 41 in this case does not fall off toward the first side in the axial direction with respect to the shaft 20 due to the convex portion 33c of the first retainer 33.
  • the first outer ring 41 further includes a step surface 41f and a fifth cylindrical surface 41g.
  • the step surface 41f extends in an annular shape from the end of the second cylindrical surface 41e on the first side in the axial direction to the outside in the radial direction.
  • the fifth cylindrical surface 41g extends in a cylindrical shape from the radially outer end of the step surface 41f to the first side in the axial direction.
  • the first outer ring 41 shown in FIG. 7 has a recess surrounded by a step surface 41f and a fifth cylindrical surface 41g at the end on the first back surface 41b side.
  • the first outer ring 41 shown in FIG. 7 can accommodate the convex portion 33c in the recess. In this case, even if the first retainer 33 having the first outer ring 41 and the convex portion 33c is used, the first retainer 33 does not protrude from the first back surface 41b toward the first side in the axial direction. .
  • the shape of the second outer ring raceway 44 is different from the shape of the second outer ring 42 shown in FIG.
  • the second outer ring raceway 44 shown in FIG. 7 does not have the third portion 44a, and the third cylindrical surface 42d extends in the axial direction from the end on the first side in the axial direction of the fourth portion 44b. extending to a first side of the.
  • the third cylindrical surface 42d is located on a tangent to the fourth portion 44b.
  • the second balls 32 are held between the second inner ring raceway 26 and the second outer ring raceway 44, the third cylindrical surface 42d is Compared to the outermost position of the second ball 32 in the radial direction, it is located on the outer side in the radial direction or at the same position in the radial direction. Therefore, in the bearing device 10 using the second outer ring 42 shown in FIG. 7, the displacement of the second outer ring 42 toward the second side in the axial direction is not restricted by the second balls 32.
  • the second retainer 34 When using the second outer ring 42 shown in FIG. 7, it is preferable to use the second retainer 34 having a convex portion 34c.
  • the fourth cylindrical surface 42e of the second outer ring 42 In the state in which the second outer ring 42 is held in between, the fourth cylindrical surface 42e of the second outer ring 42 is located radially inward compared to the outermost end position of the convex portion 34c in the radial direction.
  • the second retainer 34 is a crown retainer.
  • the plurality of second balls 32 are each placed in a pocket of the second holder 34. The second ball 32 does not come out of the pocket of the second retainer 34.
  • the second retainer 34 is not separated on the second axial side with respect to the shaft 20 .
  • the second outer ring 42 is restricted from being displaced toward the second side in the axial direction with respect to the shaft 20 by the convex portion 34c. Therefore, the second outer ring 42 in this case does not fall off toward the second side in the axial direction with respect to the shaft 20 due to the convex portion 34c of the second retainer 34.
  • the second outer ring 42 further includes a stepped surface 42f and a sixth cylindrical surface 42g.
  • the step surface 42f extends in an annular shape from the second axial end of the fourth cylindrical surface 42e to the outside in the radial direction.
  • the sixth cylindrical surface 42g extends in a cylindrical shape from the radially outer end of the step surface 42f to the axially second side.
  • the second outer ring 42 shown in FIG. 7 has a recess surrounded by a step surface 42f and a sixth cylindrical surface 42g at the end on the second back surface 42b side.
  • the second outer ring 42 shown in FIG. 7 can accommodate the convex portion 34c in the recess. In this case, even if the second retainer 34 having the second outer ring 42 and the convex portion 34c is used, the second retainer 34 does not protrude from the second back surface 42b to the second side in the axial direction. .
  • the bearing device 10 of the present disclosure has a structure in which the outer rings 41 and 42 do not separate naturally, the user can easily assemble the bearing device 10 of the present disclosure to the housings 81 and 82. .
  • each outer ring 41, 42 is aligned with the center axis C. It is unnecessary to eccentrically center the balls 31 and 32, and it is unnecessary to create a gap for gathering the balls 31, 32 together in the circumferential direction. Therefore, in the bearing device 10 having the outer rings 41 and 42 shown in FIG. 7, the number of first balls 31 and second balls 32 can be increased compared to a general deep groove ball bearing.
  • the bearing device 10 having the outer rings 41 and 42 shown in FIG. 7 can thereby have a larger load capacity than a bearing device having a general deep groove ball bearing.
  • FIG. 8 is a schematic cross-sectional view of a bearing device having an outer ring in which a resin member is arranged.
  • the bearing device 10 of the present disclosure may use a first outer ring 41 shown in FIG. 8 .
  • the first outer ring 41 shown in FIG. 8 has a groove 45 on the first back surface 41b, and a resin member 46 is fitted into the groove 45.
  • the groove portion 45 is an annular groove extending in the circumferential direction around the central axis C.
  • the groove portion 45 does not have to be annular, and may be, for example, a circle divided into a plurality of parts in the circumferential direction.
  • the resin member 46 has an annular shape that can be inserted into the groove 45.
  • the resin member 46 is made of resin having a higher coefficient of thermal expansion than the first outer ring 41 and the first housing 81. When the first outer ring 41 is not fitted into the first housing 81, the resin member 46 protrudes toward the first side in the axial direction from the first back surface 41b.
  • the second outer ring 42 shown in FIG. 8 has a groove 47 on the second back surface 42b, and a resin member 48 is fitted into the groove 47.
  • the groove portion 47 is an annular groove extending in the circumferential direction around the central axis C.
  • the groove portion 47 does not have to be annular, and may be, for example, a circle divided into a plurality of parts in the circumferential direction.
  • the resin member 48 has an annular shape that can be inserted into the groove 47.
  • the resin member 48 is made of resin having a higher coefficient of thermal expansion than the second outer ring 42 and the second housing 82. When the second outer ring 42 is not fitted into the second housing 82, the resin member 48 protrudes toward the first side in the axial direction from the second back surface 42b.
  • the temperature of the bearing device 10 including the shaft 20, the balls 31, 32, and the outer rings 41, 42 and the housings 81, 82 increases.
  • the shaft 20, each ball 31, 32, and each outer ring 41, 42 of the bearing device 10 are made of steel, and the housing 81, 82 is made of aluminum alloy
  • the shaft 20, each ball 31, 32, each outer ring 41, 42 is smaller than that of each housing 81, 82, when the temperature of the shaft 20, each ball 31, 32, each outer ring 41, 42, and each housing 81, 82 increases, the shaft 20.
  • the increase in the axial length of each ball 31, 32 and each outer ring 41, 42 is smaller than the increase in the length of the housing 81, 82.
  • the distance between the first back surface 41b and the second back surface 42b of the bearing device 10 increases, and the distance between the second portion 43b, the first ball 31, the first inner raceway 22, the second inner raceway 26, and the second portion 43b increases.
  • the strain due to the elastic deformation of the second ball 32 and the fourth portion 44b becomes smaller, and the preload F (see FIG. 2) decreases (a so-called preload release state occurs).
  • the linear expansion coefficients of the resin members 46 and 48 when the temperature rises are larger than those of steel or aluminum alloy.
  • the sum of the increase in the axial strain of the resin member 46 and the increase in the axial strain of the resin member 48 when the temperature rises is equal to and the contact portion with the second back surface 42b of the second housing 82, and the difference between the increase in axial strain of the shaft 20, each ball 31, 32, and each outer ring 41, 42. , so that it does not become smaller than the value obtained by subtracting the second assembly width LY from the first assembly width LX.
  • the bearing device 10 including the resin members 46 and 48 can prevent the preload F from decreasing or disappearing when the temperature of the bearing device 10 increases.
  • FIG. 9 is a flow diagram illustrating a method for manufacturing a bearing device according to the present disclosure.
  • FIG. 10 is a block diagram of the arithmetic device.
  • the bearing device 10 of the present disclosure is manufactured along the flow shown in FIG.
  • the bearing device 10 of the present disclosure includes a shaft 20, a first outer ring 41, a second outer ring 42, a plurality of first balls 31, and a plurality of second balls 32 selected by a calculation device 50 shown in FIG. Manufactured using
  • the arithmetic device 50 shown in FIG. 10 is composed of a computer.
  • This computer includes an arithmetic processing section 51 constituted by a CPU, a storage section 52 that inputs and stores various information (data), and an output section 53 that outputs various information.
  • the arithmetic processing unit 51 performs arithmetic processing on input data according to a stored computer program.
  • the method for manufacturing the bearing device 10 of the present disclosure executes the first step (S1) to the seventh step (S7).
  • the order from the first step (S1) to the fifth step (S5) may be random.
  • the method for manufacturing the bearing device 10 of the present disclosure executes a first step (S1).
  • the first step (S1) is a step of understanding the first relationship regarding the distance of the first outer ring 41.
  • the arithmetic device 50 calculates a first relationship, which is the axial distance between the first back surface 41b and the first reference point P1 of the first outer ring raceway 43, as the first relationship. Understand the distance L1.
  • the first reference point P1 is the center of the arc of the second portion 43b.
  • the intersection P5 is on the circle with the largest diameter of the first outer ring raceway 43. The axial position of the first reference point P1 and the axial position of the intersection P5 are equal.
  • the first distance L1 is determined by determining the axial position of the first back surface 41b and the axial position of the intersection P5 with reference to the first back surface 41b of the first outer ring 41.
  • the distance at a given temperature is calculated from the coefficient of linear expansion.
  • the radius R2 of the arc of the second portion 43b is understood as the radius at the temperature determined from the linear expansion coefficient of the first outer ring 41.
  • the diameter of the intersection point P5 is grasped as the diameter at a temperature determined from the coefficient of linear expansion of the first outer ring 41.
  • the first distance L1, the radius R2, and the diameter of the intersection P5 are determined using known image processing based on an image of each individual first outer ring 41 using a known image processing device. technology or using a laser displacement meter.
  • the calculation device 50 grasps the first relationship by storing in the storage unit 52 the first distance L1, the radius R2, and the diameter of the intersection P5 of all the first outer rings 41 used for manufacturing the bearing device 10. do.
  • the first relationship in the manufacturing method of the present disclosure is not limited to the first distance L1, and may be, for example, the ratio (L1/Dr1) of the first distance L1 to the first bearing outer diameter Dr1. good.
  • the computing device 50 When grasping the first relationship, the computing device 50 assigns an identification number to each individual of the first outer ring 41, and calculates the identification number and the first relationship (for example, first distance L1, radius R2, intersection P5 diameter) is stored in the storage unit 52 (see FIG. 10).
  • the method for manufacturing the bearing device 10 of the present disclosure executes the second step (S2).
  • the second step (S2) is a step of determining the second relationship regarding the distance of the second outer ring 42.
  • the arithmetic device 50 calculates a second relationship, which is the axial distance between the second back surface 42b and the second reference point P2 of the second outer raceway 44. Understand the distance L2.
  • the second reference point P2 is the center of the arc of the fourth portion 44b.
  • the intersection P6 is on the circle with the largest diameter of the second outer ring raceway 44. The axial position of the second reference point P2 and the axial position of the intersection P6 are equal.
  • the second distance L2 is determined by determining the axial position of the second back surface 42b and the axial position of the intersection P6 with reference to the second back surface 42b of the second outer ring 42.
  • the distance at a given temperature is calculated from the coefficient of linear expansion.
  • the radius R4 of the arc of the fourth portion 44b is understood as the radius at the temperature determined from the linear expansion coefficient of the second outer ring 42.
  • the diameter of the intersection point P6 is grasped as the diameter at a temperature determined from the coefficient of linear expansion of the second outer ring 42.
  • the second distance L2, the radius R4, and the diameter of the intersection P6 are determined using known image processing based on images of the first outer ring 41 taken individually using a known image processing device. technology or using a laser displacement meter.
  • the calculation device 50 grasps the second relationship by storing in the storage unit 52 the second distance L2, radius R4, and diameter of the intersection P6 of all the second outer rings 42 used in manufacturing the bearing device 10. do.
  • the second relationship in the manufacturing method of the present disclosure is not limited to the second distance L2, and may be, for example, the ratio (L2/Dr2) of the second distance L2 to the second bearing outer diameter Dr2. good.
  • the computing device 50 When grasping the second relationship, the computing device 50 assigns an identification number to each individual of the second outer ring 42, and calculates the identification number and the second relationship (for example, second distance L2, radius R4, intersection P6 diameter) is stored in the storage unit 52 (see FIG. 10).
  • the method for manufacturing the bearing device 10 of the present disclosure executes a third step (S3).
  • the third step (S3) is a step of determining the diameter Db1 of the first ball 31.
  • the arithmetic device 50 determines the diameter Db1 of the first ball.
  • the diameter Db1 of the first ball is measured using a known image processing technique from an image of each individual first ball 31 using a known image processing device. .
  • the calculation device 50 calculates the diameter Db1 of the first ball 31 at a determined temperature from the measurement result of the diameter Db1 of the first ball 31 and the coefficient of linear expansion of the first ball 31, and calculates the diameter Db1 of the first ball 31. Classify into multiple levels.
  • the calculation device 50 stores information regarding the first ball diameter Db1 of the first ball 31 belonging to each level (average value, maximum value, minimum value, etc. of the first ball diameter Db1) in the storage unit 52. , Thereby, the diameter Db1 of the first ball is grasped.
  • the calculation device 50 assigns an identification number to each individual first ball 31 when measuring the diameter Db1 of the first ball, links the identification number and the diameter Db1 of the first ball, and performs calculation.
  • the diameter Db1 of the first ball may be known by storing it in the storage unit 52 (see FIG. 10) of the device 50.
  • the method for manufacturing the bearing device 10 of the present disclosure executes a fourth step (S4).
  • the fourth step (S4) is a step of determining the diameter Db2 of the second ball 32.
  • the arithmetic device 50 determines the diameter Db2 of the second ball.
  • the diameter Db2 of the second ball is measured using a known image processing technique from an image of each individual second ball 32 using a known image processing device. .
  • the calculation device 50 calculates the diameter Db2 of the second ball at a determined temperature from the measurement result of the diameter Db2 of the second ball 32 and the coefficient of linear expansion of the second ball 32, and calculates the diameter Db2 of the second ball 32.
  • the second balls 32 are classified into a plurality of levels based on the measurement results of the diameter Db2.
  • the calculation device 50 stores information regarding the second ball diameter Db2 of the second ball 32 belonging to each level (average value, maximum value, minimum value, etc. of the second ball diameter Db2) in the storage unit 52. , thereby grasping the diameter Db2 of the second ball.
  • the calculation device 50 assigns an identification number to each individual second ball 32 when measuring the diameter Db2 of the second ball, links the identification number and the diameter Db2 of the second ball, and performs calculation.
  • the diameter Db2 of the second ball may be known by storing it in the storage unit 52 (see FIG. 10) of the device 50.
  • the method for manufacturing the bearing device 10 of the present disclosure executes a fifth step (S5).
  • the fifth step (S5) is a step of determining the third relationship regarding the distance of the axis 20.
  • the arithmetic device 50 grasps a third distance, which is the distance in the axial direction between the first inner raceway 22 and the second inner raceway 26, as the third relationship.
  • the third reference point P3 is the center of the raceway groove radius of the first inner raceway 22.
  • Point P7 is on the circle with the smallest diameter of the first inner raceway 22.
  • the axial position of the third reference point P3 and the axial position of the point P7 are equal.
  • the fourth reference point P4 is the center of the raceway groove radius of the second inner raceway 26.
  • Point P8 is on the circle with the smallest diameter of the second inner raceway 26.
  • the axial position of the fourth reference point P4 and the axial position of the point P8 are equal. Therefore, the third distance L3 is calculated by determining the axial position of point P7 and the axial position of point P8 with reference to the central axis C, and calculating the distance at a determined temperature from the linear expansion coefficient of the shaft 20. be sought after.
  • the raceway groove radius R5 of the first inner raceway 22 is understood as the radius at a temperature determined from the linear expansion coefficient of the shaft 20.
  • the diameter at point P7 is grasped as the diameter at a temperature determined from the linear expansion coefficient of shaft 20.
  • raceway groove radius R6 of the second inner raceway 26 is understood as the radius at a temperature determined from the linear expansion coefficient of the shaft 20. Further, the diameter at point P8 is grasped as the diameter at a temperature determined from the coefficient of linear expansion of the shaft 20.
  • the third distance L3, the radius R5, the diameter of the intersection P7, the radius R6, and the diameter of the intersection P8 are determined by photographing the shaft 20 for each individual using a known image processing device. It is measured using a known image processing technique or a laser displacement meter from the captured image.
  • the arithmetic device 50 stores the third distance L3, radius R5, diameter of the intersection P7, radius R6, and diameter of the intersection P8 of all the shafts 20 used in manufacturing the bearing device 10 in the storage unit 52, thereby calculating the third distance Understand the relationship between 3.
  • the third relationship in the manufacturing method of the present disclosure is not limited to the third distance L3, and may be, for example, the ratio of the third distance L3 to the diameter D3 of the shaft 20 (L3/D3).
  • the computing device 50 When grasping the third relationship, the computing device 50 assigns an identification number to each individual shaft 20, and calculates the identification number and the third relationship (for example, third distance L3, radius R5, diameter of intersection P7, radius R6 and diameter of intersection P8) are stored in the storage unit 52 (see FIG. 10) in association with each other.
  • the identification number and the third relationship for example, third distance L3, radius R5, diameter of intersection P7, radius R6 and diameter of intersection P8 are stored in the storage unit 52 (see FIG. 10) in association with each other.
  • the bearing device 10 of the present disclosure includes a first outer ring 41 for which a first relationship (first distance L1, radius R2, diameter at intersection P5) has been determined through a first step (S1), and a second The second outer ring 42 whose second relationship (second distance L2, radius R4, diameter of intersection P6) has been determined through step (S2), and the first ball through third step (S3)
  • 3 third distance L3, radius R5, diameter of intersection P7, radius R6, diameter of intersection P8.
  • the method for manufacturing the bearing device 10 of the present disclosure next executes the sixth step (S6).
  • the sixth step (S6) is to assemble a first outer ring 41, a second outer ring 42, a plurality of first balls 31, a plurality of second balls 32, and a shaft 20 used for assembling one bearing device 10. This is the step of selecting each individual.
  • the arithmetic device 50 selects the first outer ring 41, the second outer ring 42, the plurality of first balls 31, and the plurality of first balls 31 according to the computer program stored in the arithmetic device 50.
  • the individual balls 32 and shaft 20 of No. 2 are selected.
  • the selection of each individual is performed by the arithmetic processing unit 51 of the arithmetic device 50.
  • the arithmetic processing unit 51 uses the computer program to calculate the first relationship, the second relationship, the first ball diameter Db1, the second ball diameter Db2, and the third relationship stored in the storage unit 52. Based on this, a plurality of first balls 31 are arranged between the first outer ring raceway 43 and the first inner ring raceway 22, and a plurality of first balls 31 are arranged between the second outer ring raceway 44 and the second inner ring raceway 26.
  • the value of the distance between the first back surface 41b and the second back surface 42b that is, the first assembly width LX) when the second ball 32 is arranged is calculated.
  • the calculation processing unit 51 calculates the first outer ring 41, the second outer ring 42, the plurality of first balls 31, and the like, in which the calculated value of the first assembly width LX is included in a predetermined distance range. A combination of a plurality of second balls 32 and each individual shaft 20 is searched.
  • the "predetermined distance range" here is a range that is greater than or equal to the minimum value of the first assembly width LX in the specifications required for the bearing device 10 and less than or equal to the maximum value. Then, the calculation processing unit 51 selects each individual of the first outer ring 41, the second outer ring 42, the plurality of first balls 31, the plurality of second balls 32, and the shaft 20 based on the search result. do.
  • Each of the first outer ring 41, the second outer ring 42, and the shaft 20 is identified by an identification number assigned to each individual.
  • the first balls 31 and the second balls 32 are balls of a level suitable for each of the first outer ring 41, the second outer ring 42, and the shaft 20, and are selected by the arithmetic processing unit 51.
  • the bearing device 10 is manufactured using each individual of the first outer ring 41, the second outer ring 42, the plurality of first balls 31, the plurality of second balls 32, and the shaft 20 selected by the calculation processing unit 51.
  • the value of the first assembly width LX is included in the predetermined distance range.
  • the calculation processing unit 51 selects one of the first outer ring 41, the second outer ring 42, the plurality of first balls 31, the plurality of second balls 32, and the shaft 20. You may select at least one of the following. For example, regarding the first outer ring 41, the second outer ring 42, the plurality of first balls 31, and the plurality of second balls 32, the value of the first assembly width LX is a predetermined value regardless of which individual pieces are combined. If the distance is within the distance range, the arithmetic processing unit 51 only has to select the axis 20.
  • the arithmetic processing unit 51 uses the computer program to extract the selected first outer ring 41, second outer ring 42, plurality of first balls 31, plurality of second balls 32, and each individual of the shaft 20.
  • the value of the distance between the first back surface 41b and the second back surface 42b (ie, the second assembly width LY) when a predetermined preload F is applied to the assembled bearing device 10 is calculated.
  • the arithmetic processing unit 51 only needs to calculate the second assembly width LY after executing the sixth step (S6), and does not necessarily calculate the second assembly width LY when executing the sixth step (S6). It is not necessary to calculate.
  • the output unit 53 outputs the value of the second assembly width LY calculated by the arithmetic processing unit 51 to the outside.
  • the output unit 53 is preferably a laser engraving device, for example. In this case, the output unit 53 stamps the value of the second assembly width LY on a part of the bearing device 10.
  • the output unit 53 may be, for example, a printing device (printer). In this case, the output unit 53 prints the value of the second assembly width LY on a paper medium such as a tag or a data sheet.
  • the output unit 53 may be, for example, a device that records data on an electromagnetic recording medium (cloud storage, CD-ROM, USB memory, etc.). In this case, the output unit 53 records the value of the second assembly width LY on the electromagnetic recording medium.
  • the method for manufacturing the bearing device 10 of the present disclosure executes the seventh step (S7).
  • the seventh step is to assemble the first outer ring 41, the second outer ring 42, the plurality of first balls 31, the plurality of second balls 32, and the shaft 20 selected by the calculation device 50, This is a step of manufacturing the bearing device 10.
  • the assembly work of the bearing device 10 in the seventh step (S7) may be performed by an assembly device (not shown) whose operation is controlled by the computing device 50, or may be performed manually by an operator. .
  • the bearing device 10 is manufactured by the manufacturing method of the present disclosure including implementation of the first step (S1) to the seventh step (S7).
  • the bearing device 10 manufactured by the manufacturing method of the present disclosure is a bearing device in which the value of the first assembly width LX is included in a predetermined distance range.
  • the bearing device 10 manufactured in this manner is delivered to a user in an assembled state. Therefore, the bearing device 10 does not need to be assembled by the user, which can reduce the user's effort. Furthermore, the bearing device 10 can reduce the tolerance of the assembly width (first assembly width LX) after assembly compared to the conventional bearing device. Therefore, in the bearing device 10, it is possible to reduce the types of shims prepared by the user or eliminate shims prepared by the user.
  • FIG. 11 is an explanatory diagram of a recording section and a recording medium in the bearing device of the present disclosure.
  • the bearing device 10 of the present disclosure preferably includes a recording unit 61 or a recording medium 62 that records the second assembly width LY calculated by the arithmetic processing unit 51.
  • the recording unit 61 and the recording medium 62 record the first back surface 41b and the second back surface 42b when a predetermined preload F is applied between the first back surface 41b and the second back surface 42b in the bearing device 10. It has information about the value of the distance (second assembly width LY) between.
  • the bearing device 10 has both a recording section 61 and a recording medium 62.
  • the recording portion 61 in FIG. 11 is a mark on the shaft 20.
  • the recording medium 62 in FIG. 11 is a tag attached to the shaft 20.
  • the bearing device 10 of the present disclosure includes at least one of the recording section 61 and the recording medium 62.
  • the recording unit 61 and the recording medium 62 in the bearing device 10 of the present disclosure have information about the value of the second assembly width LY; may further include information other than that (for example, first assembly width LX, etc.).
  • the recording portion 61 is, for example, a portion where the value of the second assembly width LY is laser engraved on the outer peripheral surface of the shaft 20.
  • the bearing device 10 is delivered to a user with a recording section 61 attached to a part of the outer peripheral surface of the shaft 20.
  • the location where the recording part 61 (laser marking) is attached in the bearing device 10 is not limited to the outer circumferential surface of the shaft 20, but may be attached to the end surface of the shaft 20 in the axial direction, or it may be attached to a member other than the shaft 20 ( (a first outer ring 41, a second outer ring, etc.).
  • the recording medium 62 is, for example, a paper medium (a tag, a data sheet, etc.) on which the value of the second assembly width LY is recorded (printed).
  • the recording medium 62 may be an electromagnetic recording medium (cloud storage, CD-ROM, USB memory, etc.) on which the value of the second assembly width LY is recorded.
  • the recording medium 62 is delivered to the user together with the bearing device 10.
  • the user of the bearing device 10 can grasp the second assembled width LY of the bearing device 10 using the recording unit 61 or the recording medium 62 without actually measuring the second assembled width LY. Based on the information on the second assembly width LY provided by the recording unit 61 or the recording medium 62, the user selects the shims required when mounting the bearing device 10 to the housings 81, 82 (see FIG. 2). can do. Alternatively, the user can design the housings 81 and 82 (see FIG. 2) so that the shims are not required based on the information on the second assembly width LY provided by the recording unit 61 or the recording medium 62. . By adopting such a bearing device 10, the user can reduce the effort required to select a shim.
  • Bearing device 20 Shaft 21 First shoulder 22 First inner raceway 23 Second shoulder 24 Power transmission section 25 Third shoulder 26 Second inner raceway 27 Fourth shoulder 31 First ball 32 Second Ball 41 First outer ring 41a First front 41b First back 42 Second outer ring 42a Second front 42b Second back 43 First outer ring raceway 44 Second outer ring raceway 61 Recording section 62 Recording medium L1 First distance L2 Second distance L3 Third distance LX First assembly width LY Second assembly width Db1 First ball diameter (first diameter) Db2 Second ball diameter (second diameter)

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

Abstract

Un dispositif de palier (10) comprend : un arbre (20) ayant un premier épaulement (21), un premier chemin de roulement de bague interne (22), un deuxième épaulement (23), une partie de transmission de puissance (24), un troisième épaulement (25), un deuxième chemin de roulement de bague interne (26) et un quatrième épaulement (27) ; une pluralité de premières billes (31) ; une pluralité de deuxièmes billes (32) ; une première bague externe (41) ; et une deuxième bague externe (42). La première bague externe (41) comporte une première face avant (41a), une première face arrière (41b) et un premier chemin de roulement de bague externe (43). La deuxième bague externe (42) comporte une deuxième face avant (42a), une deuxième face arrière (42b) et un deuxième chemin de bague externe (44). Le dispositif de palier (10) est assemblé de telle sorte que l'arbre (20), la pluralité de premières billes (31), la pluralité de deuxièmes billes (32), la première bague externe (41) et la deuxième bague externe (42) ne se séparent pas. La première face avant (41a) est située sur un deuxième côté dans une direction axiale, faisant face à la partie de transmission de puissance (24), et la première face arrière (41b) est située sur un premier côté dans la direction axiale opposée à la partie de transmission de puissance (24). La deuxième face avant (42a) est située sur le premier côté dans la direction axiale, faisant face à la partie de transmission de puissance (24), et la deuxième face arrière (42b) est située sur le deuxième côté dans la direction axiale opposée à la partie de transmission de puissance (24).
PCT/JP2022/028290 2022-07-21 2022-07-21 Dispositif de palier et procédé de fabrication associé WO2024018576A1 (fr)

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PCT/JP2022/028290 WO2024018576A1 (fr) 2022-07-21 2022-07-21 Dispositif de palier et procédé de fabrication associé

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PCT/JP2022/028290 WO2024018576A1 (fr) 2022-07-21 2022-07-21 Dispositif de palier et procédé de fabrication associé

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5983832A (ja) * 1982-11-02 1984-05-15 Tokyo Seimitsu Co Ltd ボ−ルベアリングの組合せ方法および装置
JP2001330032A (ja) * 2000-05-22 2001-11-30 Nsk Ltd 複列玉軸受装置
JP2003112637A (ja) * 2001-10-03 2003-04-15 Koyo Seiko Co Ltd ウォーム減速装置及びこれを用いる電動式動力舵取装置
WO2006088149A1 (fr) * 2005-02-17 2006-08-24 Jtekt Corporation Dispositif d'arbre a cames et son procede d'assemblage
JP2006226328A (ja) * 2005-02-15 2006-08-31 Jtekt Corp 可変径プーリおよびこれを用いた無段変速機

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5983832A (ja) * 1982-11-02 1984-05-15 Tokyo Seimitsu Co Ltd ボ−ルベアリングの組合せ方法および装置
JP2001330032A (ja) * 2000-05-22 2001-11-30 Nsk Ltd 複列玉軸受装置
JP2003112637A (ja) * 2001-10-03 2003-04-15 Koyo Seiko Co Ltd ウォーム減速装置及びこれを用いる電動式動力舵取装置
JP2006226328A (ja) * 2005-02-15 2006-08-31 Jtekt Corp 可変径プーリおよびこれを用いた無段変速機
WO2006088149A1 (fr) * 2005-02-17 2006-08-24 Jtekt Corporation Dispositif d'arbre a cames et son procede d'assemblage

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