WO2016017629A1 - スラスト軸受及びその製造方法 - Google Patents
スラスト軸受及びその製造方法 Download PDFInfo
- Publication number
- WO2016017629A1 WO2016017629A1 PCT/JP2015/071356 JP2015071356W WO2016017629A1 WO 2016017629 A1 WO2016017629 A1 WO 2016017629A1 JP 2015071356 W JP2015071356 W JP 2015071356W WO 2016017629 A1 WO2016017629 A1 WO 2016017629A1
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- WIPO (PCT)
- Prior art keywords
- race
- cage
- peripheral surface
- hook curl
- thrust bearing
- Prior art date
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Classifications
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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
- F16C19/305—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 consisting of rollers held in a cage
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C19/00—Bearings with rolling contact, for exclusively rotary movement
- F16C19/02—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows
- F16C19/10—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for axial load mainly
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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
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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
- F16C33/46—Cages for rollers or needles
- F16C33/4605—Details of interaction of cage and race, e.g. retention or centring
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
- F16C33/30—Parts of ball or roller bearings
- F16C33/58—Raceways; Race rings
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
- F16C33/30—Parts of ball or roller bearings
- F16C33/58—Raceways; Race rings
- F16C33/588—Races of sheet metal
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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
- F16C43/00—Assembling bearings
- F16C43/04—Assembling rolling-contact bearings
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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
- F16C2361/00—Apparatus or articles in engineering in general
- F16C2361/61—Toothed gear systems, e.g. support of pinion shafts
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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
- F16C33/38—Ball cages
- F16C33/3806—Details of interaction of cage and race, e.g. retention, centring
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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
- F16C33/38—Ball cages
- F16C33/42—Ball cages made from wire or sheet metal strips
- F16C33/422—Ball cages made from wire or sheet metal strips made from sheet metal
- F16C33/425—Ball cages made from wire or sheet metal strips made from sheet metal from a single part, e.g. ribbon cages with one corrugated annular part
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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
- F16C33/46—Cages for rollers or needles
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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
- F16C33/46—Cages for rollers or needles
- F16C33/54—Cages for rollers or needles made from wire, strips, or sheet metal
- F16C33/542—Cages for rollers or needles made from wire, strips, or sheet metal made from sheet metal
- F16C33/543—Cages for rollers or needles made from wire, strips, or sheet metal made from sheet metal from a single part
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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
- F16C33/46—Cages for rollers or needles
- F16C33/54—Cages for rollers or needles made from wire, strips, or sheet metal
- F16C33/542—Cages for rollers or needles made from wire, strips, or sheet metal made from sheet metal
- F16C33/547—Cages for rollers or needles made from wire, strips, or sheet metal made from sheet metal from two parts, e.g. two discs or rings joined together
Definitions
- the present invention relates to a thrust bearing and a manufacturing method thereof, and more particularly, to a thrust bearing for supporting a thrust load applied to a rotating shaft of an automobile transmission, a compressor, etc., and a manufacturing method thereof.
- a guide body for preventing interference is provided (see, for example, Patent Document 1).
- the guide body protrudes in a cylindrical shape from the inner diameter edge of the race ring member in the axial direction and has an outer diameter side cylindrical portion whose outer peripheral surface is a first guide surface, and a center from an edge of the outer diameter side cylindrical portion.
- An annular portion bent toward the side and having one side surface as a second guide surface, the cage of the thrust roller bearing is guided by the first guide surface, and the radial roller bearing of the radial roller bearing is guided by the second guide surface Guides the cage.
- a thrust roller bearing in which the outer peripheral edge of the synthetic resin cage is formed as a convex curved surface over the entire circumference so that the cage does not hit the inner circumferential surface of the folded wall of the race. (For example, see Patent Document 2).
- a retainer 102 that holds a rolling element 101 is accommodated in an annular lip portion 104 of a race 103 and an end portion of the lip portion 104.
- the engaging portion 105 provided by the staking tab is engaged with the end portion of the cage 102 so as to be assembled with the race 103 in a non-separable manner.
- chamfering 102b, 102c is provided in order to prevent interference between the cage 102 and the locking portion 105 of the race 103 and the curved portion 104b of the lip portion 104.
- the present invention has been made in view of the above-described problems, and an object of the present invention is to provide an integrated thrust bearing that can be thinned while suppressing wear of a sliding contact portion between a cage and a race. There is to do. Another object of the present invention is to provide a method of manufacturing a thrust bearing capable of improving the assembling property of the cage while securely holding the cage.
- a race bearing comprising a hook curl portion formed by bending from the outer peripheral side periphery of the race portion toward the radially inner diameter side, and the outer peripheral surface of the cage includes a hook curl. It has a conical surface formed substantially parallel to the inner peripheral surface of the portion, and the inner peripheral surface of the hook curl portion is in sliding contact with the outer peripheral surface of the retainer to hold the retainer in a non-separable manner Thrust bearing.
- a race bearing wherein the race includes a hook curl portion that is bent from the inner periphery of the race portion toward the radially outer diameter side, and the inner peripheral surface of the cage is a hook. It has a conical surface formed substantially parallel to the outer peripheral surface of the curled portion, and the outer peripheral surface of the hook curled portion is in sliding contact with the inner peripheral surface of the retainer to hold the retainer inseparably. Thrust bearing.
- the thrust bearing according to (1) or (2), wherein the thrust bearing is a thrust roller bearing in which a rolling element is a roller.
- the thrust bearing is a thrust ball bearing whose rolling elements are balls.
- a race, and the race includes a hook curl portion that is bent from the outer periphery of the race portion toward the radially inner diameter side, and the outer peripheral surface of the cage is the inner peripheral surface of the hook curl portion.
- a method for manufacturing a thrust bearing comprising: (6) At least one having a cage having a plurality of radially arranged pockets, a plurality of rolling elements rotatably arranged in the plurality of pockets, and an annular race portion to which the plurality of rolling elements transfer.
- a race, and the race includes a hook curl portion that is bent from the inner periphery of the race portion toward the radially outer side, and the inner peripheral surface of the cage is the outer peripheral surface of the hook curl portion.
- a thrust bearing having a conical surface formed substantially parallel to the outer peripheral surface of the hook curl portion and in sliding contact with the inner peripheral surface of the cage to hold the cage inseparably,
- a cage in which a plurality of rolling elements are arranged in a plurality of pockets, a step of providing an annular race material, and a cage and a race material so that the plurality of rolling elements abut against the race portion of the race material.
- a method for manufacturing a thrust bearing comprising: (7) At least one having a cage having a plurality of radially arranged pockets, a plurality of rolling elements rotatably arranged in the plurality of pockets, and an annular race portion to which the plurality of rolling elements transfer.
- a plurality of hook curl portions that are bent from the outer peripheral side periphery of the race portion toward the radially inner diameter side by a plurality of cutout portions, respectively.
- the outer peripheral surfaces respectively have conical surfaces formed substantially parallel to the inner peripheral surfaces of the plurality of hook curl portions at the plurality of protrusions protruding radially outward, and the inner peripheral surfaces of the plurality of hook curl portions Is a method of manufacturing a thrust bearing that slidably contacts the outer peripheral surface of the cage and holds the cage inseparably,
- the cage is incorporated into the race, the step of arranging the cage and the race so that the plurality of rolling elements abut the race portion of the race, and the conical surface of the cage is the plurality of races.
- a method for manufacturing a thrust bearing comprising: (8) At least one having a cage having a plurality of radially arranged pockets, a plurality of rolling elements rotatably disposed in the plurality of pockets, and an annular race portion to which the plurality of rolling elements transfer.
- a plurality of hook curl portions that are bent from the inner peripheral edge of the race portion toward the radially outer diameter side by a plurality of notches, respectively.
- the inner peripheral surface has conical surfaces formed substantially parallel to the outer peripheral surface of the plurality of hook curl portions in the plurality of protrusions protruding radially inward, and the outer peripheral surfaces of the plurality of hook curl portions are ,
- a method of manufacturing a thrust bearing for slidingly contacting the inner peripheral surface of the cage and holding the cage inseparably A step including a cage in which a plurality of rolling elements are respectively disposed in a plurality of pockets, a race in which a plurality of hook curl portions and a plurality of notches are formed, a plurality of protrusions and a plurality of notches In a state where the phases are matched, the cage is incorporated into the race, the step of arranging the cage and the race so that the plurality of rolling elements abut the race portion of the race, and the conical surface of the cage is the plurality of races. Rotating the cage relative to the race so as to face the hook curl portion in the radial direction;
- a method for manufacturing a thrust bearing
- the race includes the hook curl portion that is bent from the outer periphery on the outer diameter side of the race portion toward the radially inner diameter side, and the outer peripheral surface of the cage is the inner surface of the hook curl portion. It has a conical surface formed substantially parallel to the peripheral surface. And since the inner peripheral surface of the hook curl portion is in sliding contact with the outer peripheral surface of the retainer to hold the retainer in an inseparable manner, the hook curl portion has a retainer retaining function and a radial load or radial direction on the thrust bearing. It has both functions of guiding function when displacement is applied.
- the race includes the hook curl portion that is bent from the inner diameter side periphery of the race portion toward the radially outer diameter side, and the inner peripheral surface of the cage is the hook curl.
- a conical surface formed substantially parallel to the outer peripheral surface of the portion.
- the thrust bearing is made thinner, the area of the sliding contact portion between the outer peripheral surface of the hook curl portion and the inner peripheral surface of the cage can be secured, and the surface pressure of the sliding contact portion is reduced to suppress wear. be able to. As a result, a non-separable and thin thrust bearing guided on the inner peripheral side of the cage can be manufactured.
- the outer diameter side portion of the race material is reduced in diameter while the cage is arranged on the annular race material. Since the hook curl portion is formed by bending toward the inner diameter side, the assembling property of the retainer can be improved while the retainer is securely held by the hook curl portion.
- the hook curl is bent by bending the inner diameter side portion of the race material toward the diagonally outer diameter side in a state where the cage is arranged on the annular race material. Since the portion is formed, the assembling property of the cage can be improved while the cage is securely held by the hook curl portion.
- a thrust bearing of the present invention in any case where the cage is guided on the outer diameter side or the inner diameter side of the race, the plurality of protrusions of the cage and the plurality of cuts of the race After arranging the cage and the race with the phases of the notches aligned, rotate the cage with respect to the race so that the conical surface of the cage is radially opposed to the hook curl portions of the race. .
- retainer can be improved, hold
- FIG. (A) is a perspective view of the race of the modification which has an arc-shaped cutout part
- (b) is a perspective view of the race of the other modification which has a trapezoidal cutout part.
- FIG. (B) is a perspective view of the race of the other modification which has a trapezoidal cutout part.
- the thrust roller bearing 10 of the present embodiment includes a first race 11, a second race 12, a cage 13 disposed between the first race 11 and the second race 12, and a cage. 13 and a plurality of rollers 14 which are rolling elements arranged rotatably in a plurality of pockets 13a.
- the first race 11 includes a disc-shaped first race portion 11a and an annular hook formed into a truncated cone shape by being bent at an acute angle toward the radially inner side from the outer diameter side peripheral edge 11d of the first race portion 11a. And a curled portion 11b.
- the second race 12 has a disc-shaped second race portion 12a that faces the first race portion 11a in the axial direction.
- the retainer 13 is formed in a thin disc shape with a synthetic resin.
- a plurality of rollers 14 are rotatably held in a plurality of pockets 13a arranged radially of the cage 13 so that the rotation axis thereof extends in the radial direction.
- the outer peripheral surface 13b of the cage 13 has a conical surface 13b1 that is inclined at substantially the same angle ⁇ as the inclination angle ⁇ of the inner peripheral surface 11c of the hook curl portion 11b, and is adjacent to the large-diameter side portion of the conical surface 13b1.
- a cylindrical surface 13b2 for preventing interference with the outer diameter side peripheral edge 11d.
- it is not limited to the cylindrical surface 13b2, and may be a curved shape.
- the first race 11 and the cage 13 are assembled inseparably. That is, the maximum diameter of the outer peripheral surface 13b of the cage 13 is larger than the minimum diameter of the inner peripheral surface 11c of the hook curl portion 11b, and sufficient contact surface pressure (for example, contact at half or more of the area of the conical surface 13b1). Is overlapped when viewed from the axial direction.
- the plurality of rollers 14 held in the pocket 13a of the cage 13 are arranged to roll freely between the first race portion 11a of the first race 11 and the second race portion 12a of the second race 12, A thrust load acting on the thrust roller bearing 10 is supported.
- the hook curl portion 11b of the first race 11 holds the guide function for guiding the retainer 102 included in the lip portion 104 in the conventional thrust roller bearing 100 and the retainer 102 included in the locking portion 105 in an inseparable manner. It has both functions of holding function at the same time. Therefore, in the thrust roller bearing 10 of the present embodiment, the hook curl portion 11b has a lip portion 104 and a locking portion 105 that are aligned with each other in the axial direction (thickness direction of the thrust roller bearing 100). Thinning can be easily achieved.
- the contact area between the hook curl portion 11b of the first race 11 and the outer peripheral surface 13b of the retainer 13 can be reliably ensured.
- the surface pressure at the sliding contact surface between the hook curl portion 11b of the race 11 and the outer peripheral surface 13b of the retainer 13 can be reduced to suppress wear. Therefore, it can be suitably used even in a usage environment in which a radial load such as eccentricity or centrifugal force acts on the thrust roller bearing 100, which is difficult to use with the conventional thin thrust roller bearing 100.
- a radial load such as eccentricity or centrifugal force acts on the thrust roller bearing 100, which is difficult to use with the conventional thin thrust roller bearing 100.
- first race 11 and the cage 13 are assembled in a non-separable manner, for example, the assembly to a bearing portion such as a vehicle is facilitated.
- the hook curl portion 11b of the first race portion 11a is not only formed by bending from the entire peripheral edge on the outer diameter side of the first race portion 11a toward the radially inner side, as shown in FIG.
- a plurality of cutout portions 15 are formed by cutting out a part of the annular hook curl portion 11b in a circular arc shape (FIG. 3A) or a trapezoidal shape (FIG. 3B). It may be formed. Note that the number, size, and interval of the notches 15 can be arbitrarily set, and are appropriately selected in consideration of oil permeability and the like.
- the first race 11 has the hook curl portion formed by bending from the outer diameter side periphery of the first race portion 11a toward the radially inner diameter side. 11b, and the outer peripheral surface 13b of the cage 13 has a conical surface 13b1 formed substantially parallel to the inner peripheral surface 11c of the hook curl portion 11b.
- the hook curl portion 11b since the inner peripheral surface 11c of the hook curl portion 11b is in sliding contact with the outer peripheral surface 13b of the retainer 13 to hold the retainer 13 in a non-separable manner, the hook curl portion 11b has the holding function of the retainer 13 and the thrust.
- the thrust roller bearing 10 ⁇ / b> A of the present embodiment includes a first race 11, a second race 12, a cage 13 disposed between the first race 11 and the second race 12, and a cage. 13 and a plurality of rollers 14 which are rolling elements arranged rotatably in a plurality of pockets 13a.
- the first race 11 includes a disc-shaped first race portion 11a and an annular hook curl formed into a truncated cone shape by being bent at an acute angle from the inner peripheral edge 11g of the first race portion 11a toward the radially outer side. Part 11e.
- the second race 12 has a disc-shaped second race portion 12a that faces the first race portion 11a in the axial direction.
- the retainer 13 is formed in a thin disk shape with a synthetic resin.
- a plurality of rollers 14 are rotatably held in a plurality of pockets 13a arranged radially of the cage 13 so that the rotation axis thereof extends in the radial direction.
- the inner peripheral surface 13d of the cage 13 has a conical surface 13d1 that is inclined at substantially the same angle ⁇ as the inclination angle ⁇ of the outer peripheral surface 11f of the hook curl portion 11e, and is adjacent to the small-diameter side portion of the conical surface 13d1.
- a cylindrical surface 13d2 for preventing interference with the inner peripheral edge 11g.
- the shape is not limited to the cylindrical surface 13d2 as long as it is a shape that prevents interference with the inner diameter side peripheral edge 11g, and may be a curved surface shape.
- the outer peripheral surface 11f of the hook curl portion 11e and the inner peripheral surface 13d of the retainer 13, that is, the conical surface 13d1 slide.
- the first race 11 and the cage 13 are assembled inseparably. That is, the minimum diameter of the inner peripheral surface 13d of the cage 13 is smaller than the maximum diameter of the outer peripheral surface 11f of the hook curl portion 11e, and sufficient contact surface pressure (for example, contact at half or more of the area of the conical surface 13d1). Is overlapped when viewed from the axial direction.
- the thrust roller bearing 10A of the present embodiment can be used also in a portion where a slide bearing such as a washer has been conventionally used, and the rotational resistance can be reduced.
- the first race 11 has the hook curl portion formed by bending from the inner periphery of the first race portion 11a toward the radially outer diameter side. 11e, and the inner peripheral surface 13d of the cage 13 has a conical surface 13d1 formed substantially parallel to the outer peripheral surface 11f of the hook curl portion 11e. Since the outer peripheral surface 11f of the hook curl portion 11e is in sliding contact with the inner peripheral surface 13d of the retainer 13 to hold the retainer 13 in an inseparable manner, the hook curl portion 11e It has both functions of a guide function when a radial load or radial displacement is applied to the roller bearing 10A.
- the thrust roller bearing 10A is made thinner, the area of the sliding contact portion between the outer peripheral surface 11f of the hook curl portion 11e and the inner peripheral surface 13d of the cage 13 can be secured, and the surface pressure of the sliding contact portion is reduced. Thus, wear can be suppressed. Thereby, the non-separable and thin thrust roller bearing 10A in which the cage 13 is guided on the inner peripheral side can be manufactured.
- the retainer 13 is pushed into the first race 11 in which the hook curl portion 11b is bent while pushing the outer diameter side portion of the retainer 13 while being elastically deformed. It is incorporated inside the curled portion 11b.
- the cage 13 is bent and formed in the state where the retainer 13 is set on the race material forming the first race 11, so that the retainer 13 hooks the hook curl portion of the first race 11. It is incorporated inside 11b.
- the manufacturing method of the present embodiment includes a cage 13 in which a plurality of rollers 14 are respectively disposed in a plurality of pockets 13 a of the cage 13 and an annular race material 1.
- the race material 1 is provided with an annular first race portion 11a, and an outer diameter side portion 1b forming a hook curl portion 11b is provided on the outer side in the radial direction than the first race portion 11a.
- the first race portion 11a and the outer diameter side portion 1b may be continuously flat, or the outer diameter side portion 1b is made thinner than the first race portion 11a.
- step difference between the 1st race part 11a and the outer diameter side part 1b may be sufficient.
- the cage 13 is placed on the lace material 1, and the cage 13 and the lace material 1 are arranged so that the plurality of rollers 14 come into contact with the first race portion 11a of the lace material 1.
- the outer diameter side portion 1b of the race material 1 is bent toward the radially inner diameter side so as to be substantially parallel to the conical surface 13b1 of the cage 13, thereby forming the first race 11 having the hook curl portion 11b. The Thereby, the assembly of the cage 13 holding the plurality of rollers 14 and the first race 11 is completed.
- the retainer 13 is incorporated inside the hook curl portion 11b of the first race 11 by bending a plurality of hook curl portions 11b while being set on the race material 1A, as in the present embodiment. It is. At this time, by providing the groove portion 5 in the race material 1A, it is possible to suppress sagging of the material that may occur when the hook curl portion 11b is bent. In addition, the number of the notch parts 15 should just be able to suppress the sagging of material, and should just be provided with at least one.
- the manufacturing method of this embodiment is applicable also to 10 A of thrust bearings of 2nd Embodiment. It can. That is, when the cage 13 is guided on the inner diameter side of the first race 11, the inner diameter side portion of the race material is directed to the radially outer diameter side in a state where the cage 13 is disposed on the annular race material.
- the hook curl portion 11b can be formed by bending. Also in this case, as in the modification of the present embodiment, at least one notch portion is formed on the circumferential surface on which the hook curl portion of the first race is formed by providing a groove portion in at least one place of the race material. May be provided.
- the first race 11 includes hook curl portions 11b and 11e on both sides of the inner diameter side portion and the outer diameter side portion, and the cage 13 is guided on both radial sides of the first race 11. This can also be applied.
- the first race 11 includes a plurality of (four in the present embodiment) formed by bending from the outer peripheral side periphery of the first race portion 11 a toward the radially inner diameter side.
- the hook curl portions 11b are provided by a plurality of (four in this embodiment) notch portions 15, respectively.
- the plurality of notches 15 are formed at predetermined intervals in the circumferential direction.
- the retainer 13x is provided with a plurality of four protruding portions 13e projecting radially outward at predetermined intervals in the circumferential direction, and a plurality of hook curls on the outer peripheral surface of the plurality of protruding portions 13e.
- Conical surfaces 13b1 that are formed substantially parallel to the inner peripheral surface of the portion 11b are formed. Therefore, the inner peripheral surfaces of the plurality of hook curl portions 11b are in sliding contact with the conical surface 13b1 of the protrusion 13e, which is the outer peripheral surface of the retainer, and retain the retainer 13 inseparably.
- the plurality of protrusions 13e and the plurality of notches 15 of the first race 11 are formed so as to correspond to the phases in the circumferential direction, and the circumferential length of the notches 15 is The protrusion 13e is formed longer than the circumferential length.
- the cage 13x is incorporated in the first race 11, and the plurality of rollers 14 are in contact with the first race portion 11a of the first race 11.
- the cage 13x and the first race 11 are arranged so as to contact each other.
- the retainer 13x is rotated with respect to the first race 11 so that the conical surface 13b1 of the retainer 13x is opposed to the plurality of hook curl portions 11b of the first race 11 in the radial direction. Is assembled with the cage 13x.
- the assembly of the cage 13x to the first race 11 can be improved, and the hook curl portion 11b of the first race 11 and the cage 13x can be improved.
- the length L (see FIG. 1) that overlaps the conical surface 13b1 in the radial direction can be lengthened to prevent the retainer 13x from coming off the first race 11.
- retainer 13x, and the some roller 14 are integrated, and handleability improves.
- the plurality of notches 15 of the first race 11 and the plurality of protrusions 13e of the cage 13x are spaced at equal intervals in the circumferential direction and have the same circumferential length. Is formed.
- the plurality of notches 15 of the first race 11 and the plurality of protrusions 13e of the retainer 13x may have different circumferential lengths. Good. That is, a plurality of notches 15a and 15b having different circumferential lengths and a plurality of protrusions 13e1 and 13e2 having different circumferential lengths are alternately formed in the circumferential direction.
- FIG. 8A the plurality of notches 15a and 15b having different circumferential lengths and a plurality of protrusions 13e1 and 13e2 having different circumferential lengths are alternately formed in the circumferential direction.
- the plurality of notches 15 of the first race 11 and the plurality of protrusions 13e of the retainer 13x have unequal circumferential phases. It may be an interval.
- the manufacturing method of the thrust bearing of the modified example of FIG. 8A and the manufacturing method of the thrust bearing of another modified example of FIG. It is the same as that.
- the manufacturing method of the thrust bearing 10 in which the cage 13x is guided on the outer diameter side of the first race 11 has been described.
- the cage is on the inner diameter side of the first race 11. It can also be applied to thrust bearings guided by
- the first race is provided with a plurality of hook curl portions that are formed by bending from the inner periphery of the first race portion toward the radially outer diameter side by the plurality of notches.
- the inner peripheral surface of the cage has conical surfaces formed substantially parallel to the outer peripheral surfaces of the plurality of hook curl portions at the plurality of protrusions protruding radially inward.
- the outer peripheral surface of a some hook curl part is slidably contacted with the inner peripheral surface of a holder
- the conical surface of the cage has a plurality of hook curl portions of the race.
- the first race, the cage, and the plurality of rollers can be integrally assembled by rotating the cage with respect to the race so as to face each other in the radial direction.
- the manufacturing method of the present embodiment is also applicable when the first race 11 includes hook curl portions on both sides of the inner diameter side portion and the outer diameter side portion, and the cage is guided on both radial sides of the first race 11. Can be applied.
- the thrust roller bearing having the roller 14 as the rolling element has been described.
- the thrust bearing of the present invention is a thrust ball bearing 10B having the ball 16 as the rolling element. May be.
- the cage 13 is guided on the outer diameter side of the first race 11 as in the first embodiment, but the cage 13 is in the first race as in the second embodiment. 11 may be guided on the inner diameter side.
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Abstract
Description
また、スラスト軸受100を薄型化した場合、レース103にリップ部104と係止部105とを軸方向に連続して形成することもさらに困難となる。
(1) 放射状に配置された複数のポケットを備える保持器と、複数のポケット内に回動自在に配置される複数の転動体と、複数の転動体が転送する環状のレース部を有する少なくとも一つのレースと、を備えるスラスト軸受であって、レースは、レース部の外径側周縁から径方向斜め内径側に向けて折り曲げ形成されたフックカール部を備え、保持器の外周面は、フックカール部の内周面に対して略平行に形成された円錐面を有し、フックカール部の内周面が、保持器の外周面に摺接して保持器を不分離に保持することを特徴とするスラスト軸受。
(2) 放射状に配置された複数のポケットを備える保持器と、複数のポケット内に回動自在に配置される複数の転動体と、複数の転動体が転送する環状のレース部を有する少なくとも一つのレースと、を備えるスラスト軸受であって、レースは、レース部の内径側周縁から径方向斜め外径側に向けて折り曲げ形成されたフックカール部を備え、保持器の内周面は、フックカール部の外周面に対して略平行に形成された円錐面を有し、フックカール部の外周面が、保持器の内周面に摺接して保持器を不分離に保持することを特徴とするスラスト軸受。
(3) スラスト軸受は、転動体がころであるスラストころ軸受であることを特徴とする(1)又は(2)に記載のスラスト軸受。
(4) スラスト軸受は、転動体が玉であるスラスト玉軸受であることを特徴とする(1)又は(2)に記載のスラスト軸受。
(5) 放射状に配置された複数のポケットを備える保持器と、複数のポケット内に回動自在に配置される複数の転動体と、複数の転動体が転送する環状のレース部を有する少なくとも一つのレースと、を備え、レースは、レース部の外径側周縁から径方向斜め内径側に向けて折り曲げ形成されたフックカール部を備え、保持器の外周面は、フックカール部の内周面に対して略平行に形成された円錐面を有し、フックカール部の内周面が、保持器の外周面に摺接して保持器を不分離に保持するスラスト軸受の製造方法であって、
複数のポケット内に複数の転動体がそれぞれ配置された保持器と、環状のレース素材を備える工程と、複数の転動体がレース素材のレース部と当接するように、保持器とレース素材とを配置する工程と、レース素材の外径側部分を保持器の円錐面と略平行となるように径方向斜め内径側に向けて折り曲げてフックカール部を形成する工程と、
を備えることを特徴とするスラスト軸受の製造方法。
(6) 放射状に配置された複数のポケットを備える保持器と、複数のポケット内に回動自在に配置される複数の転動体と、複数の転動体が転送する環状のレース部を有する少なくとも一つのレースと、を備え、レースは、レース部の内径側周縁から径方向斜め外径側に向けて折り曲げ形成されたフックカール部を備え、保持器の内周面は、フックカール部の外周面に対して略平行に形成された円錐面を有し、フックカール部の外周面が、保持器の内周面に摺接して保持器を不分離に保持するスラスト軸受の製造方法であって、
複数のポケット内に複数の転動体がそれぞれ配置された保持器と、環状のレース素材を備える工程と、複数の転動体がレース素材のレース部と当接するように、保持器とレース素材とを配置する工程と、レース素材の内径側部分を保持器の円錐面と略平行となるように径方向斜め外径側に向けて折り曲げてフックカール部を形成する工程と、
を備えることを特徴とするスラスト軸受の製造方法。
(7) 放射状に配置された複数のポケットを備える保持器と、複数のポケット内に回動自在に配置される複数の転動体と、複数の転動体が転送する環状のレース部を有する少なくとも一つのレースと、を備え、レースには、レース部の外径側周縁から径方向斜め内径側に向けて折り曲げ形成された複数のフックカール部が複数の切欠き部によってそれぞれ設けられ、保持器の外周面は、径方向外側に突出する複数の突起部において、複数のフックカール部の内周面に対して略平行に形成された円錐面をそれぞれ有し、複数のフックカール部の内周面が、保持器の外周面に摺接して保持器を不分離に保持するスラスト軸受の製造方法であって、
複数のポケット内に複数の転動体がそれぞれ配置された保持器と、複数のフックカール部と複数の切欠き部が形成されたレースを備える工程と、複数の突起部と複数の切欠き部の位相を合わせた状態で、保持器をレースに組み込み、複数の転動体がレースのレース部と当接するように、保持器とレースとを配置する工程と、保持器の円錐面がレースの複数のフックカール部と径方向で対向するように、保持器をレースに対して回転させる工程と、
を備えることを特徴とするスラスト軸受の製造方法。
(8) 放射状に配置された複数のポケットを備える保持器と、複数のポケット内に回動自在に配置される複数の転動体と、複数の転動体が転送する環状のレース部を有する少なくとも一つのレースと、を備え、レースには、レース部の内径側周縁から径方向斜め外径側に向けて折り曲げ形成された複数のフックカール部が複数の切欠き部によってそれぞれ設けられ、保持器の内周面は、径方向内側に突出する複数の突起部において、複数のフックカール部の外周面に対して略平行に形成された円錐面をそれぞれ有し、複数のフックカール部の外周面が、保持器の内周面に摺接して保持器を不分離に保持するスラスト軸受の製造方法であって、
複数のポケット内に複数の転動体がそれぞれ配置された保持器と、複数のフックカール部と複数の切欠き部が形成されたレースを備える工程と、複数の突起部と複数の切欠き部の位相を合わせた状態で、保持器をレースに組み込み、複数の転動体がレースのレース部と当接するように、保持器とレースとを配置する工程と、保持器の円錐面がレースの複数のフックカール部と径方向で対向するように、保持器をレースに対して回転させる工程と、
を備えることを特徴とするスラスト軸受の製造方法。
また、保持器がレースの内径側で案内される場合には、環状のレース素材に保持器を配置した状態で、レース素材の内径側部分を径方向斜め外径側に向けて折り曲げてフックカール部を形成するので、フックカール部によって保持器を確実に保持しつつ、保持器の組み付け性を向上することができる。
まず、図1を参照して、本発明の第1実施形態に係るスラスト軸受について説明する。
次に、図4を参照して、本発明の第2実施形態に係るスラスト軸受について説明する。なお、第1実施形態と同一又は同等部分については、図面に同一符号を付してその説明を省略或いは簡略化する。
次に、図5を参照して、本発明の第3実施形態に係るスラスト軸受の製造方法について説明する。なお、第1実施形態のスラスト軸受と同一又は同等部分については、図面に同一符号を付してその説明を省略或いは簡略化する。
なお、切欠き部15の数は、材料のたるみを抑制できればよく、少なくとも1つ設けられていれば良い。
即ち、保持器13が第1レース11の内径側で案内される場合には、環状のレース素材に保持器13を配置した状態で、レース素材の内径側部分を径方向斜め外径側に向けて折り曲げてフックカール部11bを形成することができる。
また、この場合にも、本実施形態の変形例のように、レース素材の少なくとも一箇所に溝部を設けることで、第1レースのフックカール部が形成される周面に少なくとも一つの切欠き部が設けられてもよい。
次に、図7を参照して、本発明の第4実施形態に係るスラスト軸受の製造方法について説明する。なお、第1実施形態のスラスト軸受と同一又は同等部分については、図面に同一符号を付してその説明を省略或いは簡略化する。
しかしながら、図8(a)の変形例に示すように、第1レース11の複数の切欠き部15、及び保持器13xの複数の突起部13eは、円周方向長さがそれぞれ異なっていてもよい。即ち、異なる円周方向長さの複数の切欠き部15a、15b、及び異なる円周方向長さの複数の突起部13e1、13e2が、円周方向に交互に形成されている。
或いは、図8(b)の他の変形例に示すように、第1レース11の複数の切欠き部15、及び保持器13xの複数の突起部13eは、円周方向の位相がそれぞれ不等間隔であってもよい。
なお、図9及び図10に示すように、図8(a)の変形例のスラスト軸受の製造方法、及び図8(b)の他の変形例のスラスト軸受の製造方法は、上記実施形態のものと同様である。
なお、上記実施形態では、転動体としてころ14を有するスラストころ軸受について説明したが、本発明のスラスト軸受としては、図11に示すように、転動体として玉16を有するスラスト玉軸受10Bであってもよい。また、図11では、第1実施形態と同様に、保持器13が第1レース11の外径側で案内される構成としているが、第2実施形態と同様に、保持器13が第1レース11の内径側で案内される構成であってもよい。
10,10A スラストころ軸受(スラスト軸受)
10B スラスト玉軸受(スラスト軸受)
11 第1レース
11a 第1レース部
11b,11e フックカール部
11c フックカール部の内周面
11f フックカール部の外周面
12 第2レース
12a 第2レース部
13,13x 保持器
13a ポケット
13b 保持器の外周面
13b1 円錐面
13d 保持器の内周面
13e 突起部
14 ころ(転動体)
15 切欠き部
16 玉(転動体)
Claims (8)
- 放射状に配置された複数のポケットを備える保持器と、
前記複数のポケット内に回動自在に配置される複数の転動体と、
前記複数の転動体が転送する環状のレース部を有する少なくとも一つのレースと、
を備えるスラスト軸受であって、
前記レースは、前記レース部の外径側周縁から径方向斜め内径側に向けて折り曲げ形成されたフックカール部を備え、
前記保持器の外周面は、前記フックカール部の内周面に対して略平行に形成された円錐面を有し、
前記フックカール部の内周面が、前記保持器の外周面に摺接して前記保持器を不分離に保持することを特徴とするスラスト軸受。 - 放射状に配置された複数のポケットを備える保持器と、
前記複数のポケット内に回動自在に配置される複数の転動体と、
前記複数の転動体が転送する環状のレース部を有する少なくとも一つのレースと、
を備えるスラスト軸受であって、
前記レースは、前記レース部の内径側周縁から径方向斜め外径側に向けて折り曲げ形成されたフックカール部を備え、
前記保持器の内周面は、前記フックカール部の外周面に対して略平行に形成された円錐面を有し、
前記フックカール部の外周面が、前記保持器の内周面に摺接して前記保持器を不分離に保持することを特徴とするスラスト軸受。 - 前記スラスト軸受は、前記転動体がころであるスラストころ軸受であることを特徴とする請求項1又は2に記載のスラスト軸受。
- 前記スラスト軸受は、前記転動体が玉であるスラスト玉軸受であることを特徴とする請求項1又は2に記載のスラスト軸受。
- 放射状に配置された複数のポケットを備える保持器と、前記複数のポケット内に回動自在に配置される複数の転動体と、前記複数の転動体が転送する環状のレース部を有する少なくとも一つのレースと、を備え、
前記レースは、前記レース部の外径側周縁から径方向斜め内径側に向けて折り曲げ形成されたフックカール部を備え、
前記保持器の外周面は、前記フックカール部の内周面に対して略平行に形成された円錐面を有し、
前記フックカール部の内周面が、前記保持器の外周面に摺接して前記保持器を不分離に保持するスラスト軸受の製造方法であって、
前記複数のポケット内に前記複数の転動体がそれぞれ配置された前記保持器と、環状のレース素材を備える工程と、
前記複数の転動体が前記レース素材のレース部と当接するように、前記保持器と前記レース素材とを配置する工程と、
前記レース素材の外径側部分を前記保持器の円錐面と略平行となるように径方向斜め内径側に向けて折り曲げてフックカール部を形成する工程と、
を備えることを特徴とするスラスト軸受の製造方法。 - 放射状に配置された複数のポケットを備える保持器と、前記複数のポケット内に回動自在に配置される複数の転動体と、前記複数の転動体が転送する環状のレース部を有する少なくとも一つのレースと、を備え、
前記レースは、前記レース部の内径側周縁から径方向斜め外径側に向けて折り曲げ形成されたフックカール部を備え、
前記保持器の内周面は、前記フックカール部の外周面に対して略平行に形成された円錐面を有し、
前記フックカール部の外周面が、前記保持器の内周面に摺接して前記保持器を不分離に保持するスラスト軸受の製造方法であって、
前記複数のポケット内に前記複数の転動体がそれぞれ配置された前記保持器と、環状のレース素材を備える工程と、
前記複数の転動体が前記レース素材のレース部と当接するように、前記保持器と前記レース素材とを配置する工程と、
前記レース素材の内径側部分を前記保持器の円錐面と略平行となるように径方向斜め外径側に向けて折り曲げてフックカール部を形成する工程と、
を備えることを特徴とするスラスト軸受の製造方法。 - 放射状に配置された複数のポケットを備える保持器と、前記複数のポケット内に回動自在に配置される複数の転動体と、前記複数の転動体が転送する環状のレース部を有する少なくとも一つのレースと、を備え、
前記レースには、前記レース部の外径側周縁から径方向斜め内径側に向けて折り曲げ形成された複数のフックカール部が複数の切欠き部によってそれぞれ設けられ、
前記保持器の外周面は、径方向外側に突出する複数の突起部において、前記複数のフックカール部の内周面に対して略平行に形成された円錐面をそれぞれ有し、
前記複数のフックカール部の内周面が、前記保持器の外周面に摺接して前記保持器を不分離に保持するスラスト軸受の製造方法であって、
前記複数のポケット内に前記複数の転動体がそれぞれ配置された前記保持器と、前記複数のフックカール部が形成された前記レースを備える工程と、
前記複数の突起部と前記複数の切欠き部の位相を合わせた状態で、前記保持器を前記レースに組み込み、前記複数の転動体が前記レースの前記レース部と当接するように、前記保持器と前記レースとを配置する工程と、
前記保持器の円錐面が前記レースの複数のフックカール部と径方向で対向するように、前記保持器を前記レースに対して回転させる工程と、
を備えることを特徴とするスラスト軸受の製造方法。 - 放射状に配置された複数のポケットを備える保持器と、前記複数のポケット内に回動自在に配置される複数の転動体と、前記複数の転動体が転送する環状のレース部を有する少なくとも一つのレースと、を備え、
前記レースには、前記レース部の内径側周縁から径方向斜め外径側に向けて折り曲げ形成された複数のフックカール部が複数の切欠き部によってそれぞれ設けられ、
前記保持器の内周面は、径方向内側に突出する複数の突起部において、前記複数のフックカール部の外周面に対して略平行に形成された円錐面をそれぞれ有し、
前記複数のフックカール部の外周面が、前記保持器の内周面に摺接して前記保持器を不分離に保持するスラスト軸受の製造方法であって、
前記複数のポケット内に前記複数の転動体がそれぞれ配置された前記保持器と、前記複数のフックカール部が形成された前記レースを備える工程と、
前記複数の突起部と前記複数の切欠き部の位相を合わせた状態で、前記保持器を前記レースに組み込み、前記複数の転動体が前記レースの前記レース部と当接するように、前記保持器と前記レースとを配置する工程と、
前記保持器の円錐面が前記レースの複数のフックカール部と径方向で対向するように、前記保持器を前記レースに対して回転させる工程と、
を備えることを特徴とするスラスト軸受の製造方法。
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KR102361997B1 (ko) * | 2017-07-21 | 2022-02-14 | 코요 베어링즈 노쓰 아메리카 엘엘씨 | 단축된 플랜지를 갖는 스러스트 베어링 케이지 |
JP7147257B2 (ja) | 2018-05-14 | 2022-10-05 | 株式会社ジェイテクト | スラストころ軸受 |
DE102021123377A1 (de) | 2021-09-09 | 2023-03-09 | Schaeffler Technologies AG & Co. KG | Axialwälzlagereinheit, umfassend mindestens eine flach oder abgewinkelt aus einem Blechmaterial umgeformte Axiallagerscheibe |
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CN106662146B (zh) | 2020-06-19 |
KR20170021346A (ko) | 2017-02-27 |
US10036420B2 (en) | 2018-07-31 |
EP3176449B1 (en) | 2020-04-22 |
JP2016033420A (ja) | 2016-03-10 |
KR101920577B1 (ko) | 2018-11-20 |
EP3176449A1 (en) | 2017-06-07 |
EP3176449A4 (en) | 2017-08-16 |
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