WO2023238364A1 - 軸受用ころの製造方法 - Google Patents

軸受用ころの製造方法 Download PDF

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Publication number
WO2023238364A1
WO2023238364A1 PCT/JP2022/023407 JP2022023407W WO2023238364A1 WO 2023238364 A1 WO2023238364 A1 WO 2023238364A1 JP 2022023407 W JP2022023407 W JP 2022023407W WO 2023238364 A1 WO2023238364 A1 WO 2023238364A1
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WO
WIPO (PCT)
Prior art keywords
boundary
crowning
circle
inclined surface
boundary circle
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Ceased
Application number
PCT/JP2022/023407
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English (en)
French (fr)
Japanese (ja)
Inventor
大和 岡田
陽一 沼田
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JTEKT Corp
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JTEKT Corp
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Filing date
Publication date
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Priority to PCT/JP2022/023407 priority Critical patent/WO2023238364A1/ja
Priority to JP2024526185A priority patent/JP7798192B2/ja
Publication of WO2023238364A1 publication Critical patent/WO2023238364A1/ja
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
    • F16C33/30—Parts of ball or roller bearings
    • F16C33/34—Rollers; Needles
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
    • F16C33/30—Parts of ball or roller bearings
    • F16C33/58—Raceways; Race rings
    • F16C33/64—Special methods of manufacture

Definitions

  • the present invention relates to a method for manufacturing bearing rollers.
  • the outer diameter surface of the bearing roller is sometimes provided with a crowning in order to relieve the excessive stress load that occurs at the axial end. Crowning is to provide a slight curvature or inclination to the entire region of the generatrix of the outer diameter surface or to both ends in the axial direction (see, for example, Patent Document 1).
  • the crowning portion 106 is formed by bringing the processed surface 202 of the grindstone 200 into contact with the outer circumferential surface 110a of the rough-shaped product 110 and polishing it.
  • the roughly shaped product 110 is a raw material for the bearing roller 100, and becomes the bearing roller 100 by providing the crowning portion 106 and the cylindrical portion 108.
  • the outer peripheral surface 110a of the rough-shaped product 110 has a chamfered portion 112 and a surface to be polished 114.
  • the chamfered portion 112 remains as the chamfered portion 102 of the bearing roller 100.
  • the processed surface 202 has an inclined surface 202a for forming the crowning portion 106 and a cylindrical surface 202b for forming the cylindrical portion 108. Both surfaces 202a and 202b are formed (dressed) into a shape that matches the shapes of the crowning part 106 and the cylindrical part 108.
  • the dressed grindstone 200 is repeatedly used to polish the bearing rollers 100. Both surfaces 202a and 202b of the grindstone 200 gradually deform due to wear due to repeated use. Due to this deformation, the dimensional accuracy of the crowning portion 106 that is formed also gradually decreases. Therefore, after the grindstone 200 has been used a predetermined number of times, it is dressed again and reshaped into a shape that matches the shapes of the crowning part 106 and the cylindrical part 108.
  • the bearing roller 100 is polished by the grindstone 200, as shown in the partial cross-sectional view shown in the broken line circle in FIG. This may occur near the boundary B with the section 106.
  • the height of the protrusion 120 in the radial direction is approximately several ⁇ m.
  • This protrusion 120 is generated due to partial wear occurring on the inclined surface 202a of the grindstone 200. That is, the area near the boundary B has the largest amount of polishing, and the applied load and surface pressure are greater than in other areas. Therefore, wear becomes noticeable in the portion of the inclined surface 202a corresponding to the boundary B. Such partial wear on the inclined surface 202a causes a protrusion 120 near the boundary B.
  • the protrusions 120 come into contact with the bearing ring. Contact between the protrusion 120 and the raceway may reduce the life of the bearing. Further, the protrusion 120 is inevitably generated when the crowning portion 106 is formed by polishing. Therefore, even if the above-mentioned protrusion occurs, a measure is desired to suppress the reduction in bearing life.
  • This embodiment is a method for manufacturing bearing rollers.
  • the outer circumferential surface of the rough-formed product of the bearing roller includes a first rough-formed product chamfer and a surface to be polished, which are arranged in order from the first side to the second side in the axial direction of the rough-formed product.
  • the outer circumferential surface of the bearing roller includes a first chamfered portion, a first crowning portion, and a second crowning portion that are arranged in order from the first side to the second side in the axial direction of the bearing roller.
  • a grindstone is brought into contact with the surface to be polished, and the first crowning part and the second crowning part are removed from the surface while leaving the first chamfered part as the first chamfered part.
  • the method includes a polishing step of forming the bearing roller on a polished surface and obtaining the bearing roller from the rough-shaped product.
  • the grinding wheel has a contact surface that contacts the rough article and a first non-contact surface that is adjacent to the contact surface on the first side of the rough article.
  • the contact surface has a first inclined surface adjacent to the first non-contact surface and for forming the first crowning part, and a second inclined surface for forming the second crowning part.
  • a boundary between the first non-contact surface and the first sloped surface is a first boundary circle, a virtual plane including the first boundary circle is a first boundary surface, and the first slope and the second slope Let the boundary be the second boundary circle.
  • a tangent to the second inclined surface on the second boundary circle is a first tangent
  • the second inclined surface is a first tangent in the axial direction than the second boundary circle.
  • a first intersection where the first boundary surface and the first conical surface intersect, when the virtual conical surface extending toward the side and whose generating line is along the first tangent line is the first conical surface.
  • the difference between the radius of the circle and the radius of the first boundary circle is 3 ⁇ m or more and 20 ⁇ m or less.
  • rollers for bearings that can suppress reduction in bearing life.
  • FIG. 1 is a front view of a cylindrical roller.
  • FIG. 2A is an enlarged view of the main part of FIG.
  • FIG. 2B is a further enlarged view of the main part of FIG. 2A.
  • FIG. 3 is a diagram showing a method for manufacturing a cylindrical roller.
  • FIG. 4 is a diagram showing a cross section of the grindstone.
  • FIG. 5 is a diagram showing a cross section of the grindstone.
  • FIG. 6 is a cross-sectional view of a cylindrical roller bearing in which the cylindrical rollers of this embodiment are used.
  • FIG. 7A is a diagram showing a main part of the outer circumferential surface of a conventional bearing roller.
  • FIG. 7B is a diagram showing a grindstone used for a conventional bearing roller.
  • This embodiment is a method for manufacturing bearing rollers.
  • the outer circumferential surface of the rough-formed product of the bearing roller includes a first rough-formed product chamfer and a surface to be polished, which are arranged in order from the first side to the second side in the axial direction of the rough-formed product.
  • the outer circumferential surface of the bearing roller includes a first chamfered portion, a first crowning portion, and a second crowning portion that are arranged in order from the first side to the second side in the axial direction of the bearing roller.
  • the method includes a polishing step of forming the bearing roller on a polished surface and obtaining the bearing roller from the rough-shaped product.
  • the grinding wheel has a contact surface that contacts the rough article and a first non-contact surface that is adjacent to the contact surface on the first side of the rough article.
  • the contact surface has a first inclined surface adjacent to the first non-contact surface and for forming the first crowning part, and a second inclined surface for forming the second crowning part.
  • a boundary between the first non-contact surface and the first sloped surface is a first boundary circle
  • a virtual plane including the first boundary circle is a first boundary surface
  • the first slope and the second slope Let the boundary be the second boundary circle.
  • a tangent to the second inclined surface on the second boundary circle is a first tangent
  • the second inclined surface is a first tangent in the axial direction than the second boundary circle.
  • a first intersection where the first boundary surface and the first conical surface intersect, when the virtual conical surface extending toward the side and whose generating line is along the first tangent line is the first conical surface.
  • the difference between the radius of the circle and the radius of the first boundary circle is 3 ⁇ m or more and 20 ⁇ m or less.
  • the radial position of the boundary between the first chamfered portion and the first crowning portion of the bearing roller obtained by the above manufacturing method is the same as that of the first chamfered portion when only the second crowning portion is provided on the outer peripheral surface of the bearing roller. It is closer to the center axis of the bearing roller than the radial position of the boundary with the second crowning part.
  • the bearing roller obtained by the above embodiment has a diameter smaller than the virtual extension surface of the second crowning part. This can prevent the protrusion from contacting the bearing ring and shortening the life of the bearing.
  • the protrusion may protrude radially outward beyond the virtual extension surface of the second crowning portion. Further, if the difference between the radius of the first intersecting circle and the radius of the first boundary circle is larger than 20 ⁇ m, the amount of polishing of the surface to be polished becomes larger than necessary. An increase in the amount of polishing may lead to an increase in cost. In the above manufacturing method, by setting the difference between the radius of the first intersecting circle and the radius of the first boundary circle to 3 ⁇ m or more and 20 ⁇ m or less, it is possible to obtain a bearing roller that can suppress a decrease in bearing life.
  • the outer circumferential surface of the rough-formed product of the bearing roller further includes a second rough-formed product chamfered portion adjacent to the second side in the axial direction of the surface to be polished.
  • the outer circumferential surface of the bearing roller includes a second chamfered portion, a third crowning portion, and a third crowning portion arranged in order from the second side to the first side in the axial direction of the bearing roller.
  • the difference between the radius of the second intersecting circle and the radius of the third boundary circle is less than 3 ⁇ m, the protrusion that occurs near the boundary between the second chamfer and the third crowning part has a diameter larger than that of the virtual extension surface of the fourth crowning part. There is a risk of it protruding outward. Further, if the difference between the radius of the second intersecting circle and the radius of the third boundary circle is larger than 20 ⁇ m, the amount of polishing of the surface to be polished becomes larger than necessary. An increase in the amount of polishing may lead to an increase in cost. In the above manufacturing method, by setting the difference between the radius of the second intersecting circle and the radius of the third boundary circle to 3 ⁇ m or more and 20 ⁇ m or less, it is possible to more reliably obtain bearing rollers that can suppress reduction in bearing life. can.
  • Setting the ratio of the first spacing to the second spacing to be smaller than 1/20 may lead to the inability to secure the desired axial length of the first crowning portion, depending on the diameter of the bearing rollers. .
  • Making the ratio of the first interval to the second interval larger than 1/2 leads to the desired length of the first crowning portion in the axial direction becoming larger than necessary, and the amount of polishing increases. An increase in the amount of polishing may lead to an increase in cost.
  • Setting the ratio of the first interval to the second interval to be 1/20 or more and 1/2 or less allows the first crowning portion to be provided in a suitable range in the axial direction.
  • FIG. 1 is a front view of a cylindrical roller.
  • cylindrical rollers 1 are bearing rollers, and are used as rolling elements of cylindrical roller bearings and thrust roller bearings.
  • the cylindrical roller 1 is a cylindrical member made of bearing steel or the like.
  • the axial direction also includes a direction parallel to the central axis C1 of the cylindrical roller 1. Further, the direction along the diameter of the cylindrical roller 1 is referred to as the "radial direction”.
  • FIG. 2A is an enlarged view of the main part of FIG. FIG. 2A shows an end portion of the cylindrical roller 1 including the first roller end surface 1b.
  • the first chamfered portion 2 As shown in FIG. 2A, on the outer peripheral surface 1a of the cylindrical roller 1, the first chamfered portion 2, the first crowned portion 10, the second crowned portion 12, and the cylindrical portion 14 are arranged on the first roller end surface 1b ( The rollers are arranged in order along the axial direction from the first roller end face 1c (first side) to the second roller end face 1c (second side).
  • the first crowning part 10 is connected to the first chamfered part 2.
  • the second crowning part 12 is provided between the first crowning part 10 and the cylindrical part 14.
  • the second crowning part 12 is located on the opposite side of the central axis C1 of the cylindrical roller 1 from a virtual straight line connecting any two points on the cross-sectional contour line of the second crowning part 12 in a cross section including the central axis C1 of the cylindrical roller 1.
  • the second crowning portion 12 has a circular shape in an arbitrary plane perpendicular to the central axis C1 of the cylindrical roller 1.
  • the angle formed by the tangent at any position of the first crowning part 10 and the central axis C1 of the cylindrical roller 1 is equal to any angle of the second crowning part 12 excluding the boundary circle K2. It is larger than the angle between the tangent at the position and the central axis C1 of the cylindrical roller 1.
  • FIG. 2B is a further enlarged view of the main part of FIG. 2A.
  • the angle between the tangent at any position of the first crowning portion 10 and the central axis C1 of the cylindrical roller 1 is the same as that of the second crowning excluding the boundary circle K2. It is larger than the angle between the tangent at any position of the portion 12 and the central axis C1 of the cylindrical roller 1. Therefore, the first crowning part 10 is inclined so as to gradually move away from the first roller extended conical surface E1 as it goes from the second crowning part 12 to the first chamfered part 2.
  • the intersecting circle P1 is a circle where the first roller extension conical surface E1 and the first boundary surface L1 intersect.
  • the first boundary surface L1 is a virtual plane including the boundary circle K1.
  • the intersection circle P1 is a virtual boundary between the first chamfered part 2 and the second crowned part 12 when it is assumed that the first chamfered part 2 and the second crowned part 12 are connected without providing the first crowned part 10. It is a yen.
  • the difference D1 between the radius of the boundary circle K1 and the radius of the intersecting circle P1 is set to be 3 ⁇ m or more and 20 ⁇ m or less.
  • the third crowning part 16 and the fourth crowning part 18 have the same configuration as the first crowning part 10 and the second crowning part 12 which are reversed by 180 degrees with respect to the center in the axial direction.
  • FIG. 3 is a diagram showing a method of manufacturing the cylindrical roller 1.
  • FIG. 3 shows a polishing process for obtaining the cylindrical roller 1 from the rough-shaped product 20.
  • the rough-shaped product 20 is the material of the cylindrical roller 1.
  • the rough-shaped product 20 becomes the cylindrical roller 1 by providing the crowning parts 10, 12, 16, 18 and the cylindrical part 14.
  • the rough-shaped product 20 has an outer peripheral surface 20a, a first rough-shaped product end face 20b that is the first side of the coarse-shaped product in the axial direction, and a second rough-shaped product end face that is the second side of the coarse-shaped product in the axial direction. 20c.
  • the grindstone 30 is brought into contact with the surface to be polished 24 .
  • each crowning part 10, 12, 16, 18 and the cylindrical part 14 are provided on the surface to be polished 24.
  • the whetstone 30 is, for example, a whetstone using abrasive grains containing alumina as a main component.
  • the grindstone 30 is formed into a substantially cylindrical shape.
  • the grindstone 30 is rotatable around the central axis C2 of the grindstone 30 by a rotating device (not shown).
  • the contact surface 32b has a plurality of surfaces for forming each crowning portion 10, 12, 16, 18 and the cylindrical portion 14.
  • the surface to be polished 24 is polished by the contact surface 32b.
  • the shape of the contact surface 32b is transferred to the surface to be polished 24.
  • each crowning part 10, 12, 16, 18 and the cylindrical part 14 are formed on the surface to be polished 24.
  • the rough-shaped product 20 becomes the cylindrical roller 1 by forming the crowning parts 10, 12, 16, 18 and the cylindrical part 14 on the surface to be polished 24.
  • FIG. 4 is a diagram showing a cross section of the grindstone 30. Note that although FIG. 4 shows a cross section, the following description will mainly describe each part of the external shape that appears in the cross section.
  • the contact surface 32b has a first inclined surface 40, a second inclined surface 42, and a cylindrical surface (flat surface) 44.
  • the first inclined surface 40, the second inclined surface 42, and the cylindrical surface 44 extend from the first grinding wheel end surface 30a (first side) of the grinding wheel 30 to the second grinding wheel end surface 30b (second side) (Fig. 3) are lined up in order along the axial direction.
  • the cylindrical surface 44 is a surface for forming the cylindrical portion 14.
  • the cylindrical surface 44 is provided at the axial center of the contact surface 32b.
  • the first inclined surface 40 and the second inclined surface 42 are provided between the first non-contact surface 32a and the cylindrical surface 44.
  • the first inclined surface 40 is connected to the first non-contact surface 32a.
  • the first inclined surface 40 is a surface for forming the first crowning part 10.
  • the first inclined surface 40 has a curved surface.
  • the first inclined surface 40 has two arbitrary points on the central axis C2 side of the grinding wheel 30 from a virtual straight line connecting arbitrary two points on the cross-sectional contour line of the first inclined surface 40 in a cross section including the central axis C2 of the grinding wheel 30.
  • the first inclined surface 40 has a circular shape in any cross section perpendicular to the central axis C2 of the grindstone 30.
  • the second inclined line portion PL2 is a curved line having the same curvature as the curvature of the curved line in the cross section including the central axis C1 of the second crowning portion 12.
  • the straight line portion PL5 is a contour line corresponding to the cylindrical surface 44.
  • the straight line portion PL5 is a straight line parallel to the central axis C2.
  • the first boundary circle B1 is the boundary between the first non-contact surface 32a and the first inclined surface 40.
  • the first boundary circle B1 is in contact with the boundary circle K1 between the first chamfered part 2 and the first crowning part 10.
  • the second boundary circle B2 is the boundary between the first inclined surface 40 and the second inclined surface 42.
  • the second boundary circle B2 touches the boundary circle K2 between the first crowning part 10 and the second crowning part 12.
  • the first boundary surface L1 is a virtual plane including the first boundary circle B1 (boundary circle K1). Therefore, when the boundary circle K1 and the first boundary circle B1 coincide at the end of the polishing process, the first roller extension conical surface E1 and the first conical surface E10 overlap.
  • the first intersecting circle P10 is a circle where the first boundary surface L1 and the first conical surface E10 intersect.
  • the difference D10 between the radius of the first intersecting circle P10 and the radius of the first boundary circle B1 is 3 ⁇ m or more and 20 ⁇ m or less.
  • the radial position of the boundary circle K1 of the cylindrical roller 1 obtained by the above configuration is the difference between the first chamfered part 2 and the second crowned part 12 when only the second crowned part 12 is provided on the outer peripheral surface 1a of the cylindrical roller 1. It is closer to the center axis C1 of the cylindrical roller 1 than the radial position of the boundary (crossing circle P1).
  • the first roller can be placed radially inward from the extended conical surface E1 (FIG.
  • the lower limit of the difference D10 is preferably 5 ⁇ m or more. By setting the lower limit to 5 ⁇ m or more, the manufacturing method described above can more reliably accommodate the protrusion that occurs near the boundary circle K1 on the radially inward side of the first roller extension conical surface E1. Further, the upper limit of the difference D10 is preferably 10 ⁇ m or less. By setting the upper limit to 10 ⁇ m or less, the above manufacturing method can reliably suppress an increase in cost.
  • the distance in the axial direction between the second boundary circle B2 and the first boundary circle B1 is the first interval W1
  • the distance between the boundary circle B10 and the first boundary circle B1 is When the distance in the axial direction is defined as the second interval W2, the ratio of the first interval W1 to the second interval W2 is preferably 1/20 or more and 1/2 or less.
  • the boundary circle B10 (fifth boundary circle) is the boundary between the second inclined surface 42 and the cylindrical surface 44.
  • the first crowning part 10 formed by the first inclined surface 40 may have a narrower axial range. If the first crowning part 10 becomes smaller, there is a possibility that the necessary range for the first crowning part 10 cannot be secured. If the ratio of the first interval to the second interval is larger than 1/2, the first crowning portion 10 formed by the first inclined surface 40 will have a larger axial range than necessary, and the amount of polishing will increase. This may lead to an increase in costs.
  • the ratio of the first interval W1 to the second interval W2 can be 1/20 or more and 1/2 or less, the above manufacturing method can provide the first crowning portion 10 in a suitable axial range.
  • the lower limit of the ratio of the first interval W1 to the second interval W2 is preferably 1/7 or more.
  • the manufacturing method described above can more reliably provide the first crowning portion 10 in a suitable axial range.
  • the axial width of the first crowning part 10 of the cylindrical roller 1 formed by the grindstone 30 is the first crowning width CW1, and the entire crowning part including the first crowning part 10 and the second crowning part 12
  • the first crowning width CW1 relative to the overall crowning width CW can be set as follows. That is, when the overall crowning width CW is 1.5 mm or more and less than 3 mm, it is preferable that the first crowning width CW1 is 0.5 mm. Further, when the overall crowning width CW is 3 mm or more and less than 6 mm, it is preferable that the first crowning width CW1 is 1.0 mm. Further, when the overall crowning width CW is 6 mm or more, it is preferable that the first crowning width CW1 is 2 mm.
  • FIG. 5 is a diagram showing a cross section of the grindstone 30.
  • FIG. 5 shows a cross section of the grindstone 30 including the second grindstone end surface 30b. Note that although FIG. 5 shows a cross section, the following description will mainly describe each part of the external shape that appears in the cross section.
  • the outer circumferential surface 1a of the cylindrical roller 1 has the second chamfered portion 6, the third crowned portion 16, and the fourth crowned portion 18.
  • the second chamfered portion 6, the third crowned portion 16, and the fourth crowned portion 18 extend in the axial direction from the second roller end surface 1c (second side) of the cylindrical roller 1 toward the first roller end surface 1b (first side). are lined up in order along.
  • the third crowning portion 16 is connected to the second chamfered portion 6.
  • the fourth crowning part 18 is provided between the third crowning part 16 and the cylindrical part 14.
  • the third crowning part 16 has a similar shape to the first crowning part 10.
  • the fourth crowning part 18 has a similar shape to the second crowning part 12. Therefore, description of the third crowning part 16 and the fourth crowning part 18 will be omitted.
  • the contact surface 32b further includes a third inclined surface 50 and a fourth inclined surface 52.
  • the third inclined surface 50, the fourth inclined surface 52, and the cylindrical surface 44 are connected from the second grinding wheel end surface 30b (second side) of the grinding wheel 30 to the first grinding wheel end surface 30a (first side) (Fig. 3) are lined up in order along the axial direction.
  • the third inclined surface 50 and the fourth inclined surface 52 are provided between the second non-contact surface 32c and the cylindrical surface 44.
  • the third inclined surface 50 is connected to the second non-contact surface 32c.
  • the third inclined surface 50 is a surface for forming the third crowning portion 16.
  • the third inclined surface 50 has a curved surface.
  • the third boundary circle B3 is the boundary between the second non-contact surface 32c and the third inclined surface 50.
  • the third boundary circle B3 touches the boundary circle K4 between the second chamfered portion 6 and the third crowning portion 16.
  • the fourth boundary circle B4 is the boundary between the third inclined surface 50 and the fourth inclined surface 52.
  • the fourth boundary circle B4 touches the boundary circle K5 between the third crowning part 16 and the fourth crowning part 18.
  • the second boundary surface L2 is a virtual plane including the third boundary circle B3 (boundary circle K4). Therefore, when the boundary circle K4 and the third boundary circle B3 coincide at the end of the polishing process, the second roller extended conical surface E2 and the second virtual extended conical surface E12 overlap.
  • the second roller extended conical surface E2 is a virtual conical surface whose generatrix is a tangent to the fourth crowning portion 18 in the boundary circle K5 in a cross section including the central axis C1 of the cylindrical roller 1.
  • the second roller extension conical surface E2 is a virtual extension surface of the fourth crowning portion 18.
  • the second intersecting circle P12 is a circle where the second boundary surface L2 and the second conical surface E12 intersect.
  • the embodiments disclosed herein are illustrative in all respects and are not restrictive.
  • the first crowning part 10 and the third crowning part 16 are convex curved surfaces having a predetermined curvature, and the first inclined line part PL1 and the third inclined line part PL3 of the contour line PL of the grindstone 30 are , the curves correspond to the first crowning part 10 and the third crowning part 16.
  • the first crowning part 10 and the third crowning part 16 may be conical surfaces, and the first inclined line part PL1 and the third inclined line part PL3 may be straight lines.
  • the second crowning part 12 and the fourth crowning part 18 are convex curved surfaces having a predetermined curvature, and the second slope line part PL2 and the fourth slope line part PL4 of the contour line PL of the grindstone 30 are , the curves correspond to the second crowning part 12 and the fourth crowning part 18.
  • the second crowning part 12 and the fourth crowning part 18 may be conical surfaces, and the second inclined line part PL2 and the fourth inclined line part PL4 may be straight lines.
  • rollers used in cylindrical roller bearings
  • the method for manufacturing rollers disclosed in this embodiment is applicable to rollers other than cylindrical rollers, such as tapered rollers, bar rollers, needle rollers, etc. It is also applicable.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Rolling Contact Bearings (AREA)
PCT/JP2022/023407 2022-06-10 2022-06-10 軸受用ころの製造方法 Ceased WO2023238364A1 (ja)

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WO2010001706A1 (ja) * 2008-07-01 2010-01-07 Ntn株式会社 軸受用ころ、軸受、および軸受用ころ加工方法
WO2016133211A1 (ja) * 2015-02-20 2016-08-25 Ntn株式会社 窒化珪素ころ、窒化珪素ころの製造方法、および窒化珪素ころの検査方法
WO2017086120A1 (ja) * 2015-11-18 2017-05-26 Ntn株式会社 軸受用ころの超仕上げ加工方法および超仕上げ加工装置
JP2021105451A (ja) * 2017-03-28 2021-07-26 Ntn株式会社 円錐ころ軸受

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0312015U (https=) * 1988-08-10 1991-02-07

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2010001706A1 (ja) * 2008-07-01 2010-01-07 Ntn株式会社 軸受用ころ、軸受、および軸受用ころ加工方法
WO2016133211A1 (ja) * 2015-02-20 2016-08-25 Ntn株式会社 窒化珪素ころ、窒化珪素ころの製造方法、および窒化珪素ころの検査方法
WO2017086120A1 (ja) * 2015-11-18 2017-05-26 Ntn株式会社 軸受用ころの超仕上げ加工方法および超仕上げ加工装置
JP2021105451A (ja) * 2017-03-28 2021-07-26 Ntn株式会社 円錐ころ軸受

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