WO2022249723A1 - スラストころ軸受 - Google Patents

スラストころ軸受 Download PDF

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Publication number
WO2022249723A1
WO2022249723A1 PCT/JP2022/014995 JP2022014995W WO2022249723A1 WO 2022249723 A1 WO2022249723 A1 WO 2022249723A1 JP 2022014995 W JP2022014995 W JP 2022014995W WO 2022249723 A1 WO2022249723 A1 WO 2022249723A1
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WO
WIPO (PCT)
Prior art keywords
race
roller bearing
thrust roller
race surface
main body
Prior art date
Legal status (The legal status 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 status listed.)
Ceased
Application number
PCT/JP2022/014995
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English (en)
French (fr)
Japanese (ja)
Inventor
晃典 岡本
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
NSK Ltd
Original Assignee
NSK Ltd
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 NSK Ltd filed Critical NSK Ltd
Priority to JP2023524051A priority Critical patent/JPWO2022249723A1/ja
Publication of WO2022249723A1 publication Critical patent/WO2022249723A1/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
    • F16C19/00—Bearings with rolling contact, for exclusively rotary movement
    • F16C19/22—Bearings with rolling contact, for exclusively rotary movement with bearing rollers essentially of the same size in one or more circular rows, e.g. needle bearings
    • F16C19/30—Bearings with rolling contact, for exclusively rotary movement with bearing rollers essentially of the same size in one or more circular rows, e.g. needle bearings for axial load mainly
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C19/00—Bearings with rolling contact, for exclusively rotary movement
    • F16C19/52—Bearings with rolling contact, for exclusively rotary movement with devices affected by abnormal or undesired conditions
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
    • F16C33/30—Parts of ball or roller bearings
    • F16C33/58—Raceways; Race rings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • 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
    • F16C33/62—Selection of substances
    • 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 thrust roller bearings.
  • Patent Document 1 As a thrust roller bearing, in Patent Document 1, a bearing ring is integrated with an insulating resin to cut off current flow to the thrust roller bearing and prevent electrolytic corrosion. .
  • a resin bearing ring resin insulating portion
  • an iron bearing ring steel race body portion
  • abrasion of the resin bearing ring is prevented and electrical current is cut off by the resin bearing ring to suppress the occurrence of electrolytic corrosion on the raceway surfaces of the rollers and the iron bearing ring.
  • Patent Document 2 in a radial bearing, grooves are formed on the outer peripheral surface and both left and right end surfaces of the outer ring, respectively, and an insulating film of a predetermined thickness is continuously adhered to both end surfaces from the outer peripheral surface of the outer ring by injection molding.
  • An anti-galvanic corrosion rolling bearing is described.
  • the thrust roller bearing of Patent Document 1 in order to structurally and mechanically integrate the iron bearing ring and the resin bearing ring, which are different materials, the iron bearing ring and the resin bearing ring are processed.
  • the iron bearing ring and the resin bearing ring may separate due to impact, external force, or the like, before the stage of assembling the bearing.
  • the present invention has been made in view of the above-mentioned problems, and its object is to provide an electrolytic corrosion-resistant function and to prevent separation between a steel race main body and a resin insulating part by a simple mechanism. It is an object of the present invention to provide a thrust roller bearing capable of
  • a plurality of radially arranged rollers a retainer having a plurality of pockets which are formed in an annular shape as a whole and hold the plurality of rollers in a rollable manner; at least one race comprising a race surface on which the plurality of rollers roll;
  • a thrust roller bearing comprising: The race comprises the race surface and includes a steel race main body portion having a hardness of HRC 58 or higher, a resin insulating portion provided at least on the anti-race surface opposite to the race surface, A thrust roller bearing that is an insert-molded product integrated with
  • the thrust roller bearing of this invention has an electrolytic corrosion-resistant function by a simple mechanism, Separation of the steel race body and the resin insulation can be prevented.
  • FIG. 1 is a cross-sectional view of a thrust roller bearing according to a first embodiment of the invention.
  • 2(a) is a perspective view of the thrust roller bearing shown in FIG. 1
  • FIG. 2(b) is a perspective view showing the thrust roller bearing shown in FIG. 2(a) with the first race removed.
  • 3(a) is a perspective view of a second race of the thrust roller bearing shown in FIG. 1
  • FIG. 3(b) is a front view of the second race.
  • FIG. 4 is a sectional view taken along line IV-IV of FIG. 3(b).
  • FIG. 5(a) is a perspective view of a second race of a thrust roller bearing according to a second embodiment of the invention
  • FIG. 5(b) is a front view of the second race.
  • FIG. 6 is a sectional view taken along line VI-VI in FIG. 5(b).
  • FIG. 7(a) is a perspective view of a second race of a thrust roller bearing according to a third embodiment of the invention, and FIG. 7(b) is a front view of the second race.
  • 8(a) is a cross-sectional view taken along line VIII-VIII in FIG. 7(b), and FIG. 8(b) is a cross-sectional view taken along line VIII'-VIII' in FIG. 7(b).
  • FIG. 9(a) is a perspective view of a second race of a thrust roller bearing according to a fourth embodiment of the invention, and FIG. 9(b) is a front view of the second race.
  • FIG. 10(a) is a cross-sectional view taken along line XX of FIG. 9(b), and FIG. 10(b) is a cross-sectional view taken along line X'-X' of FIG. 9(b).
  • FIG. 11 is a cross-sectional view of a thrust roller bearing according to a fifth embodiment of the invention.
  • 12(a) is a perspective view of the thrust roller bearing shown in FIG. 11, and
  • FIG. 12(b) is a perspective view showing the thrust roller bearing shown in FIG. 12(a) with the first race removed.
  • 13(a) is a perspective view of a second race of the thrust roller bearing shown in FIG. 11, and FIG. 13(b) is a front view of the second race.
  • FIG. 14 is a cross-sectional view taken along line XIV-XIV of FIG. 13(b).
  • FIG. 15 is a cross-sectional view of a thrust roller bearing according to a sixth embodiment of the invention.
  • 16(a) is a perspective view of the thrust roller bearing shown in FIG. 15, and
  • FIG. 16(b) is a perspective view showing the thrust roller bearing shown in FIG. 16(a) with the first race removed.
  • 17(a) is a perspective view of a second race of the thrust roller bearing shown in FIG. 15, and
  • FIG. 17(b) is a front view of the second race.
  • FIG. 18 is a cross-sectional view taken along line XVIII-XVIII in FIG. 17(b).
  • the thrust roller bearing 10 of the present embodiment has a plurality of radially arranged rollers 11 and a ring-like shape as a whole to hold the plurality of rollers 11 so that they can roll freely. It includes a retainer 15 having a plurality of pockets 15a, and a first race 20 and a second race 30 that sandwich the plurality of rollers 11 from the axial direction. Therefore, the plurality of pockets 15 a of the retainer 15 are radially formed so that the axes of the plurality of rollers 11 are directed in the radial direction of the thrust roller bearing 10 .
  • the first race 20 is formed by pressing a metal disk with a hole, and has a circular ring portion 23 provided with a race surface 22 on which a plurality of rollers 11 roll, and an outer peripheral edge of the metal disk that is bent in the axial direction.
  • An outer cylindrical portion 24 is formed and is continuous with the annular portion 23 on the outer diameter side.
  • the second race 30 is an insert-molded product in which a steel race main body 40 and a resin insulating part 50 are integrated.
  • the race main body portion 40 is formed by pressing a metal disk with a hole, and includes a circular ring portion 42 provided with a race surface 41 on which a plurality of rollers 11 roll, and an inner peripheral edge of the metal disk that is bent in the axial direction.
  • An inner cylindrical portion 43 is formed and is continuous with the annular portion 42 on the inner diameter side.
  • a plurality of (four in this embodiment) tabs 44 are formed at the axial tip of the inner cylindrical portion 43 by plastic deformation in the radial direction toward the race surface 41 (outer diameter side in this embodiment). ing. As a result, a recessed portion 45 recessed toward the outer diameter side is formed on the inner diameter side of the tab 44 .
  • the tabs 44 are engaged with the retainer 15 to prevent the retainer 15 from being separated from the second race 30 in order to improve the handleability of the thrust roller bearing 10 .
  • the race bodies 40 of the first race 20 and the second race 30 may have a hardness of HRC 58 or more, and may be made of case-hardened steel subjected to carbonitriding or high-carbon steel that has been quenched and tempered. can be used.
  • the insulating portion 50 is made of a resin material having electrical insulation performance and resistance to the operating temperature of the bearing, typified by PPS (polyphenylene sulfide) resin, polyamide 66, and polyamide 46.
  • PPS polyphenylene sulfide
  • the insulating portion 50 includes a resin-side annular portion 51 formed in a flat plate shape in contact with the anti-race surface 46 of the race body portion 40 opposite to the race surface 41, and an inner diameter of the resin-side annular portion 51 and the resin-side annular portion 51. It has a resin-side cylindrical portion 52 formed in contact with the inner peripheral surface 47 of the inner cylindrical portion 43, and is formed by integrating a resin material by insert molding.
  • the outer diameter of the resin-side annular portion 51 is substantially equal to the outer diameter of the annular portion 42
  • the axial end portion of the resin-side cylindrical portion 52 is the axial end portion of the inner cylindrical portion 43 . is formed to be approximately equal to
  • part of the resin material covering the inner peripheral surface 47 of the inner cylindrical portion 43 enters the plurality of recessed portions 45 formed by the tabs 44 to form a plurality of (four in this embodiment) convex portions 53 .
  • the race main body portion 40 and the insulating portion 50 are configured such that the resin side cylindrical portion 52 having the convex portion 53 is formed by the inner peripheral surface 47 (race surface 41 and the peripheral surface on the opposite side in the radial direction) suppresses relative axial, radial and circumferential movement, resulting in axial separation from each other and radial and rotational movement. Displacement is suppressed.
  • the recessed portion 45 is always formed when the tab 44 is processed, there is no need to apply special processing to the race body portion 40 when integrally molding the insulating portion 50 with the race body portion 40 . Moreover, since it is not a mechanical engagement, there is no need to provide a shape for engagement on the race main body 40 side, and there are no dimensional restrictions.
  • a plurality of through-holes 54 extending axially through the resin-side annular portion 51 of the insulating portion 50 are provided at regular intervals in the circumferential direction so as to face the anti-race surface 46 .
  • the race main body 40 is formed by heat-treating a thin plate material after press-working it. For this reason, the race surface 41 of the race main body 40 is inevitably warped and undulated due to heat treatment strain. This warping and waviness are premised on how to obtain a flat race surface 41 by applying a constant load to the thrust roller bearing 10 to correct it. However, if the insulating portion 50 is integrally molded with the warp and undulation remaining, the thickness of the resin-side annular portion 51 will vary, and the warp and undulation will remain on the race surface 41 . The warping and waviness of the race surface 41 are factors that locally concentrate the load on the rolling elements, and there is concern that early flaking or the like may occur due to excessive contact pressure.
  • a plurality of pins (not shown) are implanted in one of the molds, and the mold is closed. When closed, the pin presses the anti-race surface 46, and the resin is integrally molded between the race surface and the opposing flat surface of the other mold while correcting warpage and undulation.
  • a plurality of through holes 54 formed in the resin-side annular portion 51 of the insulating portion 50 are traces of pins during this molding.
  • the diameter d of the through-holes 54 is 1 mm or more and 5 mm or less, and the pitch p between the centers of the adjacent through-holes 54 is set to be 5 mm or more and 20 mm or less.
  • the ratio t1/t2 between the plate thickness t1 of the annular portion 42 provided with the race surface 41 and the thickness t2 of the resin-side annular portion 51 formed on the opposite race surface 46 of the annular portion 42 is the insulating portion It can be set arbitrarily as long as it ensures the injection moldability of 50 and the insulation for preventing electrolytic corrosion.
  • the thickness of the entire race is can suppress the increase in sag.
  • the thickness t2 of the resin-side annular portion 51 is preferably 0.1 mm or more in consideration of injection moldability and insulation.
  • the tabs 44 i.e., the protrusions 53
  • the tabs 44 are formed at four locations in the circumferential direction at regular intervals. Moreover, it does not matter if it is more than that. Moreover, the convex portions 53 may not be evenly spaced in the circumferential direction.
  • the insulating portion 50 electrically insulates the thrust roller bearing 10 from the mating member (housing) (not shown). It is possible to prevent electrolytic corrosion from occurring in the race bodies 40 of the first race 20 and the second race 30 .
  • the insulating portion 50 has the convex portion 53 that fits into the recessed portion 45 of the tab 44, it is possible to prevent the race body portion 40 and the insulating portion 50 from being separated in the axial direction and from being displaced in the radial direction and the rotational direction. As a result, wear of the race body portion 40 and the insulating portion 50 can be prevented.
  • the insulating portion 50 By integrally molding the insulating portion 50 with the race body portion 40 , the insulating portion 50 enters the resin filling hole 65 to form the projection 56 .
  • the protrusion 56 prevents the race main body 40 and the insulating portion 50 from being displaced in the radial direction and in the rotational direction.
  • the resin filling hole 65 is formed in a tapered shape with a smaller diameter toward the opposite race surface 46 at the opening on the race surface side.
  • the protrusion 56 is formed in a tapered shape with a larger diameter toward the race surface side, and axial separation of the race body portion 40 and the insulating portion 50 can also be prevented.
  • the resin filling hole 65 can be formed when the race main body 40 is press worked, in which case special processing of the race main body 40 is not required.
  • the insulating portion 50 also has the convex portion 53 formed in the concave portion 45 of the tab 44 described in the first embodiment.
  • Other configurations and actions are the same as those of the first embodiment.
  • FIG. 7 a thrust roller bearing 10 of a third embodiment will be described with reference to FIGS. 7 and 8.
  • FIG. In the second race 30B of the present embodiment, when the insulating portion 50 is integrally formed with the race main body portion 40, the annular portion covering the outer diameter side peripheral surface 71 of the race main body portion 40 from the outer diameter side over the entire circumference is formed. 57 is formed.
  • the outer diameter side peripheral surface 71 of the race body portion 40 is formed by press working, and has a fractured surface with rougher surface roughness than the race surface 41 and the like.
  • the annular portion 57 of the insulating portion 50 covers the outer peripheral surface 71 of the race main body portion 40, so that the resin material enters the irregularities of the outer peripheral surface 71, thereby Relative axial, radial and circumferential movement of 40 and insulating portion 50 is suppressed, and as a result, axial separation and radial and rotational misalignment from each other is suppressed.
  • the edge 72 of the outer diameter side peripheral surface 71 on the side of the race surface 41 is formed on the side opposite to the race surface 46 of the outer diameter side peripheral surface 71 due to the fractured surface at the time of cutting. It is slanted so as to be closer to the inner diameter side (closer to the race surface) than the edge portion 73 . Therefore, the annular portion 57 can more reliably prevent axial separation between the race body portion 40 and the insulating portion 50 .
  • a plurality of (two in this embodiment) radial grooves are provided on the outer peripheral surface 71 of the race main body 40 so as to be spaced apart in the circumferential direction.
  • a notch 74 is formed.
  • the edge of the opening on the race surface side of the radial cutout portion 74 is tapered so that the opening on the race surface side is wider than the opening on the anti-race surface side.
  • the radial cutout portion 74 is provided on the outer diameter side of the race surface 41 in the same manner as the resin filling hole 65 of the second embodiment.
  • the resin material forming the insulating portion 50 enters and fills the radial cutout portion 74 to form the radial convex portion 58 projecting radially inward from the annular portion 57 .
  • the race main body portion 40 and the insulating portion 50 are prevented from being separated from each other in the axial direction and from being displaced in the radial direction and the rotational direction.
  • the insulating portion 50 has the convex portion 53 formed in the concave portion 45 of the tab 44 described in the first embodiment.
  • Other configurations and actions are the same as those of the first embodiment.
  • FIG. 10 In the second race 30C of the present embodiment, instead of the tabs 44 of the above-described embodiment, a plurality (two in this embodiment) of generally arc-shaped plastic deformations radially outward are provided on the axial end face of the inner cylindrical portion 43. ) is formed. As a result, a substantially arc-shaped recessed portion 76 recessed toward the outer diameter side is formed on the inner diameter side of the curl 75 .
  • the curl 75 prevents the cage 15 from being separated from the thrust roller bearing 10 by the curl 75 engaging with the cage 15 when the thrust roller bearing 10 is assembled.
  • the resin-side cylindrical portion 52 covers the inner circumferential surface 47 (the circumferential surface opposite to the race surface 41 in the radial direction) of the inner cylindrical portion 43.
  • a convex portion 59 is formed in the concave portion 76 of the curl 75 to prevent axial separation of the race main body portion 40 and the insulating portion 50 and radial and rotational displacement.
  • the curl 75 may be formed over the entire circumference of the axial end surface of the inner cylindrical portion 43 , and in that case, the convex portion 59 is also formed over the entire circumference of the concave portion 76 .
  • a plurality of (two in the present embodiment) spherical protrusions 77 protruding toward the inner diameter side are provided in the axially intermediate portion of the inner cylindrical portion 43 .
  • the spherical projections 77 are formed at the intermediate portions of the curl 75 in the circumferential direction, they may be formed at different positions from the curl 75 in the circumferential direction.
  • a spherical concave portion 60 covering the spherical convex portion 77 is formed in the resin-side cylindrical portion 52 of the insulating portion 50 . It is possible to prevent axial separation of the insulating portion 50 and displacement in the radial direction and the rotational direction. Even if the concave-convex relation between the spherical convex portion 77 and the spherical concave portion 60 is reversed, the same effect as described above can be obtained.
  • the inner cylindrical portion 43 has a plurality of (two in this embodiment) axial grooves 78 recessed on the inner diameter surface of the inner cylindrical portion 43. They are spaced apart in the circumferential direction.
  • the insulating portion 50 integrally with the race main body portion 40, the insulating portion 50 enters the inner diameter side of the axial groove 78 to form the ridge 61 extending in the axial direction.
  • the ridges 61 can further prevent radial and rotational shifts between the race main body 40 and the insulating portion 50 at circumferential positions where the curls 75 are not formed. Even if the relationship between the axial grooves 78 and the ridges 61 is reversed, the same effect as described above can be obtained.
  • the race main body 40 has a fractured surface 71 on the outer diameter side peripheral surface 71 of the race main body 40, as in the third embodiment.
  • an annular portion 57 covering the outer peripheral surface 71 is formed in the insulating portion 50 .
  • FIG. 11 a thrust roller bearing 10 of a fifth embodiment
  • FIG. 11 uses a second race 30D that is not integrated with the retainer 15, unlike that of the above embodiment.
  • the race main body portion 40 of the second race 30D has an axial cutout portion (axial cutout portion) 62 for lubrication at the tip portion of the inner cylindrical portion 43 in the circumferential direction.
  • a plurality (four in this embodiment) are provided at regular intervals.
  • the resin-side cylindrical portion 52 covers the inner peripheral surface 47 (the peripheral surface on the opposite side of the race surface 41 in the radial direction) of the inner cylindrical portion 43 of the race body portion 40, By covering the axial side surface of the cutout portion 62 for lubrication with the radially outer convex portion 55 projecting radially outwardly from the tip portion of the resin-side cylindrical portion 52, the axial direction of the race body portion 40 and the insulating portion 50 is reduced. separation and radial and rotational misalignment can be prevented.
  • the notch 62 for lubrication can be formed during punching by pressing, and no special processing for forming the notch 62 is required. Furthermore, since the race main body 40 and the insulating part 50 are not mechanically engaged, the race main body 40 is free from shape and size restrictions.
  • the second race 30D which is not integrated with the retainer 15, has an electrolytic corrosion resistance function and prevents separation between the steel race body portion 40 and the resin insulating portion 50 by a simple mechanism. be able to.
  • the resin-side annular portion 51 of the insulating portion 50 is formed with a plurality of through-holes 54, which are traces of pins for preventing the race surface 41 from warping or undulating, as in the above-described embodiment.
  • Other configurations and actions are the same as those of the first embodiment.
  • the race body portion 40 does not include the inner cylindrical portion 43 (see FIG. 1), and is a pressed flat disc on which the plurality of rollers 11 roll. It comprises an annular portion 42 provided with a race surface 41 .
  • the outer diameter side peripheral surface 71 of the race main body portion 40 is a fractured surface formed by press working, similarly to the third embodiment, and the surface roughness of the surface is rough.
  • the edge 72 of the outer peripheral surface 71 on the side of the race surface 41 is arranged to be on the inner diameter side of the edge 73 of the outer peripheral surface 71 on the side opposite to the race surface 46 due to the fracture surface at the time of cutting. formed with an inclination to
  • the insulating portion 50 has the annular portion 57 that covers the outer diameter side peripheral surface 71 of the race body portion 40 from the outer diameter side over the entire circumference, so that the race body portion 40 and the insulating portion Axial separation of 50 and radial and rotational misalignment can be prevented.
  • the insulating portion 50 can prevent electrolytic corrosion occurring in the race body portion 40 of the rollers 11, the first steel race 20, and the second race 30E. It is possible to prevent axial separation and radial and rotational displacement between the portion 40 and the insulating portion 50 .
  • the resin-side annular portion 51 of the insulating portion 50 is also formed with a plurality of through-holes 54, which are traces of pins for preventing the race surface 41 from warping or undulating, as in the above-described embodiment. Other configurations and actions are the same as those of the first embodiment.
  • the present invention is not limited to the above-described embodiments, and can be modified, improved, etc. as appropriate. That is, in the thrust roller bearing of the present invention, the race has an electrolytic corrosion resistance function, and the race main body and the insulating portion are integrally formed so as to prevent separation between the steel race main body and the resin insulating portion. It is sufficient if it is an insert-molded product that has been modified. Therefore, for example, the projection 56 of the insulating portion 50 of the second embodiment, the radial convex portion 58 of the insulating portion 50 of the third embodiment, the spherical concave portion 60 and the convex strip 61 of the insulating portion 50 of the fourth embodiment, It can also be applied to other embodiments.
  • the race main body portion has a plurality of race-side through holes provided at positions radially offset from the race surface in the annular portion, and the insulating portion has a plurality of through holes.
  • a configuration having a plurality of protrusions that enter the race-side through holes may be provided.
  • the race-side through-hole is preferably formed on the side opposite to the race surface in the radial direction from the side where the cylindrical portion is formed.
  • the race main body portion including the inner cylindrical portion and the flat race main body portion have been described, but the present invention only requires that the insulating portion be arranged in the portion that makes metal contact with the mating member.
  • the first race 20, etc. may be applied to a race main body portion having an outer cylindrical portion formed by bending the outer peripheral edge of a circular portion in the axial direction, and further including both an inner cylindrical portion and an outer cylindrical portion. can be applied in the same way. Further, for example, even if the race main body has the inner cylindrical portion and the outer cylindrical portion, the insulating portion may not have the resin cylindrical portion if the insulating function is not affected.
  • a plurality of radially arranged rollers a retainer having a pocket formed entirely in an annular shape and holding the plurality of rollers in a rollable manner; at least one race comprising a race surface on which the plurality of rollers roll;
  • a thrust roller bearing comprising: The race comprises the race surface, and is integrated with a steel race body portion having a hardness of HRC 58 or more and a resin insulating portion provided at least on the anti-race surface opposite to the race surface.
  • Thrust roller bearings which are insert-molded products with According to this configuration, it is possible to prevent separation between the steel race main body and the resin insulation part while having an electrolytic corrosion-resistant function with a simple mechanism.
  • the race main body portion includes a circular ring-shaped portion provided with the race surface, and a cylindrical portion continuous with the circular ring-shaped portion on the inner diameter side or the outer diameter side, A tip portion of the cylindrical portion is provided with a tab or curl that is bent radially toward the race surface to prevent separation of the retainer,
  • the insulating portion covers a circumferential surface of the cylindrical portion radially opposite the race surface, including the tabs or curls, to provide at least axial separation and radial displacement with respect to the race body portion.
  • the thrust roller bearing according to (1) which suppresses According to this configuration, since the tabs or curls for engaging the retainer are formed at the tip of the cylindrical portion, the insulating portion is formed integrally with the race body portion without special processing. By doing so, it is possible to suppress at least axial separation and radial displacement between the race main body portion and the insulating portion.
  • the race main body portion includes a circular ring-shaped portion provided with the race surface, and a cylindrical portion continuous with the circular ring-shaped portion on the inner diameter side or the outer diameter side, An axially notched portion that is notched in the axial direction is formed in a part of the circumferential direction of the distal end portion of the cylindrical portion,
  • the insulating portion covers the circumferential surface of the cylindrical portion on the side opposite to the race surface in the radial direction and the axial side surface of the axial notch portion, thereby providing at least axial separation and radial separation from the race body portion.
  • the thrust roller bearing according to (1) which suppresses directional displacement.
  • the insulating portion can be integrally formed with the race main body portion without special processing. It is possible to suppress at least axial separation and radial displacement between the insulating portion and the insulating portion.
  • the race main body includes an annular portion provided with the race surface, A radial cutout portion that is cut in the radial direction toward the race surface is formed in a part of the circumferential direction of the radial end portion of the annular portion, The edge of the race surface side opening of the radial cutout is formed in a tapered shape so that the race surface side opening is wider than the race surface side opening, Any one of (1) to (5), wherein the insulating portion is filled in the radial cutout portion to suppress at least axial separation and radial displacement with respect to the race body portion. 1.
  • the insulating portion is formed integrally with the race main body portion without performing any special processing. It is possible to suppress at least axial separation and radial displacement between the insulating portion and the insulating portion.
  • the race main body includes an annular portion provided with the race surface, At least one of the inner peripheral surface and the outer peripheral surface of the annular portion provided with the race surface has an edge with the race surface closer to the race surface than an edge with the anti-race surface.
  • the race main body portion has a plurality of race-side through holes provided at positions radially offset from the race surface in the annular portion;
  • the diameter of the through-hole is 1 mm or more and 5 mm or less, and The thrust roller bearing according to (10), wherein the pitch between the centers of the adjacent through holes is 5 mm or more and 20 mm or less. According to this configuration, it is possible to correct warpage and undulation of the race surface over the entire surface while ensuring injection moldability.
  • Thrust roller bearing 11 Roller 15 Cage 15a Pockets 30, 30A, 30B, 30C, 30D, 30E Second race 40 Race body 41 Race surface 42 Annular portion 43 Inner cylindrical portion 44 Tab 46 Anti-race surface 50 Insulating portion 51 Resin-side annular portions 53, 59 Protruding portion 55 Outer diameter side protruding portion 56 Protrusion 57 Annular portion 58 Radial direction protruding portion 60 Spherical concave portion 61 Protruding streak 54 Through hole 62 Notch portion for lubrication (axial direction notch portion) 65 resin filling hole (race side through hole) 72 Edge with race surface 73 Edge with anti-race surface 74 Radial notch 75 Curl d Diameter of through-hole p Pitch between centers of adjacent through-holes t1 Plate thickness of annular portion t1/t2 Circular shape Plate thickness ratio t2 between the part and the resin-side circular ring-shaped part Thickness of the resin-side circular ring-shaped part

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Rolling Contact Bearings (AREA)
PCT/JP2022/014995 2021-05-25 2022-03-28 スラストころ軸受 Ceased WO2022249723A1 (ja)

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01124423U (https=) * 1988-02-18 1989-08-24
JP2013194292A (ja) * 2012-03-21 2013-09-30 Ntn Corp 軌道盤、スラストニードルころ軸受およびこれらの製造方法
WO2016195107A1 (ja) * 2015-06-03 2016-12-08 日本精工株式会社 スラストころ軸受及び軸受装置
JP2020063826A (ja) * 2018-10-19 2020-04-23 日本精工株式会社 転がり軸受

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01124423U (https=) * 1988-02-18 1989-08-24
JP2013194292A (ja) * 2012-03-21 2013-09-30 Ntn Corp 軌道盤、スラストニードルころ軸受およびこれらの製造方法
WO2016195107A1 (ja) * 2015-06-03 2016-12-08 日本精工株式会社 スラストころ軸受及び軸受装置
JP2020063826A (ja) * 2018-10-19 2020-04-23 日本精工株式会社 転がり軸受

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