WO2016163527A1 - 円すいころ軸受 - Google Patents
円すいころ軸受 Download PDFInfo
- Publication number
- WO2016163527A1 WO2016163527A1 PCT/JP2016/061575 JP2016061575W WO2016163527A1 WO 2016163527 A1 WO2016163527 A1 WO 2016163527A1 JP 2016061575 W JP2016061575 W JP 2016061575W WO 2016163527 A1 WO2016163527 A1 WO 2016163527A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- cage
- tapered roller
- diameter side
- ring
- roller 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
- F16C19/34—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 both radial and axial load
- F16C19/36—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 both radial and axial load with a single row of rollers
- F16C19/364—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 both radial and axial load with a single row of rollers with tapered rollers, i.e. rollers having essentially the shape of a truncated cone
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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
- F16C33/4617—Massive or moulded cages having cage pockets surrounding the rollers, e.g. machined window cages
- F16C33/4623—Massive or moulded cages having cage pockets surrounding the rollers, e.g. machined window cages formed as one-piece cages, i.e. monoblock cages
- F16C33/4635—Massive or moulded cages having cage pockets surrounding the rollers, e.g. machined window cages formed as one-piece cages, i.e. monoblock cages made from plastic, e.g. injection moulded window cages
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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
- F16C33/467—Details of individual pockets, e.g. shape or roller retaining means
- F16C33/4676—Details of individual pockets, e.g. shape or roller retaining means of the stays separating adjacent cage pockets, e.g. guide means for the bearing-surface of the rollers
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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
- F16C33/66—Special parts or details in view of lubrication
- F16C33/6637—Special parts or details in view of lubrication with liquid lubricant
- F16C33/6681—Details of distribution or circulation inside the bearing, e.g. grooves on the cage or passages in the rolling elements
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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
- F16C2208/00—Plastics; Synthetic resins, e.g. rubbers
- F16C2208/20—Thermoplastic resins
- F16C2208/60—Polyamides [PA]
-
- 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
- F16C2322/00—Apparatus used in shaping articles
- F16C2322/50—Hand tools, workshop equipment or manipulators
- F16C2322/59—Manipulators, e.g. robot arms
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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
Definitions
- the present invention relates to tapered roller bearings used in industrial robots and reduction gears for construction machinery.
- the present invention relates to a tapered roller bearing having a structure in which a tapered roller and a cage are integrated in order to prevent the tapered roller from falling off and to have a shape without an inner ring.
- the tapered roller bearing 11 includes an inner ring 12 having a tapered raceway surface 12 a on the outer peripheral surface, an outer ring 13 having a tapered raceway surface 13 a on the inner peripheral surface, and a raceway surface 12 a of the inner ring 12. And a plurality of tapered rollers 14 that roll between the raceway surface 13a of the outer ring 13 and a retainer 15 that holds each tapered roller 14 in a pocket portion so that it can roll freely.
- the cage 15 is formed by connecting a large-diameter ring portion 15a and a small-diameter ring portion 15b with a plurality of column portions 15c, and houses the tapered rollers 14 in a pocket portion 16 between the column portions 15c.
- a large collar 12b and a small collar 12c are integrally formed at the large-diameter side end of the inner ring 12, so that the tapered roller 14 and the retainer 15 do not fall off the inner ring 12.
- the inner ring in the tapered roller bearing has a tapered raceway surface, so that it has a small diameter side and a large diameter side when viewed in the axial direction, and the “small collar” is a collar provided at the end of the small diameter side.
- the “cradle” is a scissor provided at the end on the large diameter side.
- Patent Document 1 proposes a structure in which the raceway surface is secured by continuing the raceway surface of the inner ring to the end surface on the small diameter side of the inner ring.
- Patent Document 1 when the inner ring raceway surface is continued to the end surface on the small diameter side of the inner ring, the tapered roller, the inner ring, and the cage are separated, but the tapered roller and the cage are integrated by devising the shape of the cage. It describes what you can do.
- patent document 1 and patent document 2 as a manufacturing method of the retainer which integrated the tapered roller and the retainer, it is described that injection molding is performed using two dies in the axial direction (axial draw). ing.
- the cage 21 holds a tapered roller (not shown) in the pocket portion 22.
- Conical surfaces 24 and 25 are provided on the inner diameter side and the outer diameter side of the column part 23 for the purpose of preventing the tapered roller from falling off the pocket part 22 during assembly.
- the conical surface 24 on the inner diameter side and the conical surface 25 on the outer diameter side are formed diagonally on one side of the column portion 23.
- the grooves 26 are formed along the mold parting line, and even if burrs are generated between the molds after molding, interference of the burrs with the tapered rollers is prevented.
- the dividing pillar part becomes thin and there exists a possibility that the mechanical strength of a pillar part may fall.
- the column portion is thin although the diameter of the cage is large, so that the ring rigidity of the entire cage is likely to decrease.
- the guide surface that is the contact surface with the tapered roller is widened in order to stably hold the tapered roller, the actual contact area increases, and it is difficult for the lubricant to enter this portion, which may result in poor lubricity. .
- the present invention has been made to cope with such a problem, and can stably hold the tapered roller when integrating the tapered roller and the cage while enabling molding with a simple mold.
- the tapered roller bearing according to the present invention includes an inner ring having a tapered raceway surface on an outer peripheral surface, an outer ring having a tapered raceway surface on an inner peripheral surface, and a raceway surface between the inner ring and the outer raceway surface.
- a tapered roller bearing comprising a plurality of tapered rollers that roll, and a cage that holds the tapered rollers in a pocketable manner in a pocket portion
- the cage is an injection-molded body formed by injection molding a resin composition
- the cage is (A) It has a large-diameter ring part, a small-diameter ring part, and a plurality of pillar parts connecting them, and the pocket part is formed between adjacent pillar parts, or (B)
- the adjacent column portions each including a plurality of column portions and a ring portion that is provided on either the small diameter side or the large diameter side of the cage and supports the column portions at equal intervals in the circumferential direction.
- the pocket portion is formed between the two, and at the opposite end of the column portion on the ring portion side, the pocket portion has a protrusion that protrudes toward the pocket portion and supports one end surface of the tapered roller,
- the cage is (1)
- the mold parting line by the injection molding along the axial direction is formed in the column part, and the circumferential direction of the pocket part opening is smaller than the parting line in the pillar part and on the outer diameter side of the cage.
- a mold parting line by the injection molding along the axial direction is formed in the column part, and the circumferential direction of the pocket part opening is larger than the parting line in the pillar part and on the inner diameter side of the cage. It has a guide portion for the tapered roller having a surface formed in the direction of narrowing the width, and is used for preventing the tapered roller from falling off on the larger diameter side and the outer diameter side of the cage than the dividing line in the column portion. It has a nail
- the cage satisfies the above (B), and the ring portion is provided on the large diameter side of the cage.
- This is a structure in which the ring portion on the small diameter side is omitted.
- the inner ring has a structure that does not have a small wrinkle at a small-diameter side end, or a structure that does not have a small wrinkle at a small-diameter side end and a large-diameter side end.
- the width of the guide portion in the taper direction is 51% or more of the width of the column portion in the taper direction.
- the guide part and the drop-off preventing claw part are formed by the same mold, and the claw part is formed without excessive force.
- the height h of the claw portion, h / t 1 with respect to the claw portion width t 1 of the taper direction of the pillar portion is 0.02 or more, and, h against the cage axial direction of the claw portion width t 2 / T 2 is 0.02 or more.
- the guide portion has a groove penetrating at both axial end portions thereof.
- the cage satisfies the above (1), and the groove has a shape in which the groove width increases from the axial end on the outer diameter side of the cage toward the opposite end in the axial direction, or
- the cage satisfies the above (2), and the groove has a shape in which the groove width narrows from the axial end on the inner diameter side of the cage toward the opposite end in the axial direction.
- a mold parting line is formed along the axial direction in the column part of the cage that is an injection-molded product, and the parting line in the column part
- the guide portion and the drop-off preventing claw portion can be formed by the same side die, and the die structure can be simplified.
- the tapered roller and the cage can be integrated by the claw portion for preventing the dropout, the structure can be eliminated, and the length of the tapered roller can be extended to increase the load capacity and reduce the size. Become.
- a mold parting line along the axial direction is formed in a column part of the cage that is an injection molded body, and the parting line in the column part Has a tapered roller guide portion on the larger diameter side and the inner diameter side of the cage, and a claw portion for preventing the tapered roller from falling off on the larger diameter side and the outer diameter side of the cage from the dividing line in the column portion. Therefore, both the guide portion on the inner diameter side and the claw portion on the outer diameter side are on the larger diameter side than the dividing line, and the taper roller retainability is excellent.
- the guide portion and the drop-off preventing claw portion can be formed by the same side die, and the die structure can be simplified.
- the tapered roller and the cage can be integrated by the claw portion for preventing the dropout, the structure can be eliminated, and the length of the tapered roller can be extended to increase the load capacity and reduce the size. Become.
- the tapered roller bearing of the present invention in which the cage satisfies (B) has the cage provided on a plurality of column portions and either the small-diameter side or the large-diameter side of the cage to surround the column portion.
- the ring portion is provided on the large diameter side of the cage and the ring portion on the small diameter side is omitted, the amount of cage drawing from the outer ring end face can be greatly increased.
- the inner ring width can be reduced.
- the column part has a guide part of a tapered roller having a surface formed in a direction to narrow the circumferential width of the opening of the pocket part and a claw part for preventing the tapered roller from falling off, these and the above-mentioned protrusion
- the tapered roller and the cage can be integrated with each other while the small-diameter ring portion is omitted. As a result, it is possible to obtain a structure in which a small wrinkle is eliminated, and it is possible to increase the load capacity and reduce the size by extending the length of the tapered roller.
- the cage is an injection-molded body of a resin composition
- the guide portion, the claw portion, and the projection portion having the predetermined shape can be easily formed integrally with the cage body.
- the guide part and the claw part are on the same side (small diameter side or large diameter side) with respect to the mold parting line at the time of injection molding in the column part, molding with two dies by axial draw
- the guide part and the claw part can be formed by a mold on the same side, and the mold structure can be simplified.
- the width of the guide portion in the taper direction is 51% or more of the width of the column portion in the taper direction
- the mold dividing surface is larger in diameter than the center of the column portion of the cage.
- the mold dividing surface is shifted to the smaller diameter side from the center of the pillar portion of the cage, and the tapered rollers can be held more stably.
- the height h of the claw portion for preventing the drop-off is such that h / t 1 is 0.02 or more with respect to the claw portion width t 1 in the taper direction of the column portion, and the claw portion width t 2 in the cage shaft direction.
- h / t 2 is 0.02 or more, cracking and whitening can be prevented even when the nail portion is formed without force.
- the guide portion Since the guide portion has predetermined grooves penetrating at both axial end portions thereof, lubricity on the guide surface of the guide portion is improved.
- the tapered roller bearing according to the present invention includes an inner ring having a tapered raceway surface on an outer peripheral surface, an outer ring having a tapered raceway surface on an inner peripheral surface, and a raceway surface between the inner ring and the outer raceway surface.
- a tapered roller bearing comprising a plurality of tapered rollers that roll, and a cage that holds the tapered rollers in a pocketable manner in a pocket portion
- the cage is an injection-molded body formed by injection molding a resin composition
- the cage is (A) It has a large-diameter ring part, a small-diameter ring part, and a plurality of pillar parts connecting them, and the pocket part is formed between adjacent pillar parts, or (B)
- the adjacent column portions each including a plurality of column portions and a ring portion that is provided on either the small diameter side or the large diameter side of the cage and supports the column portions at equal intervals in the circumferential direction.
- the pocket portion is formed between the two, and at the opposite end of the column portion on the ring portion side, the pocket portion has a protrusion that protrudes toward the pocket portion and supports one end surface of the tapered roller,
- the cage is (1)
- the mold parting line by the injection molding along the axial direction is formed in the column part, and the circumferential direction of the pocket part opening is smaller than the parting line in the pillar part and on the outer diameter side of the cage.
- a mold parting line by the injection molding along the axial direction is formed in the column part, and the circumferential direction of the pocket part opening is larger than the parting line in the pillar part and on the inner diameter side of the cage. It has a guide portion for the tapered roller having a surface formed in the direction of narrowing the width, and is used for preventing the tapered roller from falling off on the larger diameter side and the outer diameter side of the cage than the dividing line in the column portion. It has a nail part.
- tapered roller bearing of the present invention in which the cage satisfies (A) and (1) will be described with reference to FIGS.
- the term “taper roller bearing of the present invention” simply means the tapered roller bearing of the present invention in which the cage satisfies (A) and (1).
- FIG. 1 is an axial sectional view and an exploded view of a tapered roller bearing having no inner ring gavel
- FIG. 2 (a) is an axial sectional view of the cage
- FIG. 2 (b) is a cage. It is sectional drawing along the axis
- the tapered roller bearing 1 includes an inner ring 2 having a tapered raceway surface 2 a on an outer peripheral surface, an outer ring 3 having a tapered raceway surface 3 a on an inner peripheral surface, and a raceway surface 2 a of the inner ring 2.
- Each raceway surface has a tapered shape in which the diameter constituting the raceway surface increases and decreases along the axial direction.
- the taper angle is not particularly limited, but is usually about 15 ° to 60 ° with respect to the axial direction.
- a small flange is not formed at the small diameter side end portion of the inner ring 2
- a large flange 2 b is integrally formed at the large diameter side end portion of the inner ring 2.
- the tapered roller bearing according to the present invention may have a structure that eliminates at least the small wrinkles, and may have a structure that eliminates both the small and large wrinkles as necessary.
- the tapered roller bearing 1 is an integrated product 7 in which a cage 5 and a tapered roller 4 are integrated, and the integrated product 7, the inner ring 2, and the outer ring 3 are combined. Used by incorporating into the site. As described above, when the cage and the tapered roller are integrated, the tapered roller 4 does not fall off from the cage 5 (maintains integration) at the time of assembling. .
- the pocket portion of the cage has a claw portion that serves as a tapered roller fall-off preventing portion, and the tapered roller is incorporated into the pocket portion through elastic deformation of the claw portion and integrated with the cage. Has been.
- the cage 5 is formed by connecting a large-diameter ring portion 5a and a small-diameter ring portion 5b, which are rib portions, by a plurality of column portions 5c.
- the tapered roller 4 is accommodated in the pocket part 6 between the parts 5c.
- the cage 5 is an injection-molded body formed by injection molding a resin composition described later.
- a mold parting line X is formed on the column portion 5c by injection molding along the axial direction of the cage (also the axial direction of the bearing). The mold parting line X is shifted to the larger diameter side from the center of the column part 5c.
- This injection mold consists of two dies with an axial draw, one of which is a mold on the larger diameter side (upper side in the figure) than the mold parting line X and the other is on the smaller side of the mold parting line X.
- This is a mold (lower side in the figure).
- both molds one is a fixed mold and the other is a movable mold.
- the mold on the larger diameter side (upper side in the figure) than the mold parting line X Moves to the left in the figure, and the smaller diameter side (the lower side in the figure) from the mold parting line X moves to the right in the figure.
- the mold parting line X can be varied between the large-diameter ring portion 5a and the small-diameter ring portion 5b within a range that does not reach these ring portions.
- the cage 5 has a tapered roller guide portion 5d on the smaller diameter side than the mold dividing line X in the column portion 5c and on the outer diameter side of the cage, and is held on the smaller diameter side than the mold dividing line X in the column portion 5c.
- a claw portion 5e for preventing the tapered roller from falling off is provided on the inner diameter side of the vessel.
- the guide portion 5d is composed of a surface (guide surface) formed in a direction to narrow the circumferential width of the pocket portion opening.
- the tapered roller 4 rolls while contacting a part of the guide surface of the guide portion 5d.
- the shape of the guide surface may be a curved surface along a tapered roller or a flat surface (straight surface).
- the guide part 5d forms the taper-shaped opening along the generatrix of the tapered roller when it sees from the pocket opening part surface.
- the guide portion 5d can prevent the tapered roller 4 from coming off from the side where the guide portion 5d of the cage 5 is formed.
- the tapered roller 4 is inserted into the pocket portion 6 of the cage 5 while being elastically deformed from the inner diameter side of the cage 5 while the hook portion 5e is elastically deformed. It is surrounded and held by the guide part 5d and the claw part 5e.
- the width t 3 in the taper direction of the guide part 5d is preferably 51% or more of the width b (same as the width of the pocket part) in the taper direction of the column part 5c. Thereby, the tapered roller can be held more stably. More preferably, it is 55% or more, more preferably 60% or more, and most preferably 65% or more.
- the guide portion 5d is formed from the small diameter ring portion 5b to just before the mold parting line X. With such a configuration, while the smaller diameter side than the mold parting line X, can be secured width t 3 as long as possible.
- claw part 5e can be formed in arbitrary places if it is a small diameter side and the cage
- FIG. In relation to the position of the guide portion 5d, it is preferable to form the tapered roller at a position where the tapered roller can be easily held. In the form shown in FIG. 2A, two of the same shape are formed apart from each other near the mold parting line X within the width range of the guide portion 5d in the taper direction.
- the number of the claw portions is not limited to this, and it is sufficient that there are at least one claw portion, and three or more claw portions may be formed when more stable holding of the tapered rollers is required.
- both the guide portion 5d and the claw portion 5e are disposed on the smaller diameter side than the mold parting line X, they are molded by the mold on the same side.
- a claw portion 5e is also formed by a mold for forming the guide portion 5d, and the claw portion 5e is forcibly removed. In this case, stress is generated in the nail portion, and there is a possibility that the tip is cracked or the root is whitened.
- the cage material is made of PA66 resin (containing 30% by volume of glass fiber), and “ ⁇ ” in the table indicates that neither cracking nor whitening is observed, “ ⁇ ” indicates that there is no cracking but whitening is recognized, “X” indicates a case where cracks are observed.
- h / t 1 is 0.02 or more with respect to the claw width t 1 in the columnar taper direction, and the claw width t 2 in the cage axial direction.
- h / t 2 is 0.02 or more, it can be seen that cracking and whitening during forced injection molding can be prevented.
- the tip of the claw portion 5e in the thickness direction has an R shape. Thereby, a crack and whitening can be prevented more. In addition, burrs are unlikely to occur.
- Table 2 shows the verification results of the relationship between the radius R and the height h of the claw, the relationship between cracking and whitening when the injection molding is forcibly removed, and the retainability of the tapered rollers.
- “ ⁇ ” for the retainability of the tapered roller indicates that there is no problem in retainability and injection molding
- “ ⁇ ” indicates that injection molding can be performed but whitening is observed
- “-” indicates that it has not been evaluated. It is.
- c is preferably 81% to 120% with respect to a.
- the ring rigidity of the cage can be improved. More preferably, it is 84 to 100%.
- the gate 8 which is a resin insertion port at the time of injection molding on the inner diameter side of the small diameter ring portion 5b.
- the weld position 9 can be set between the pillar parts of the large diameter ring part 5a, and the strength reduction of the cage can be suppressed.
- the thickness of the small diameter ring portion 5b is preferably 1.6 to 4 times the gate diameter. Thereby, it can shape
- the guide portion is wide, and the tapered roller can be stably held.
- a groove 5f penetrating at both axial end portions thereof is provided to promote the inflow of the lubricant to the guide surface.
- the guide portion 5d is discontinuous by the groove 5f.
- one groove 5f parallel to the axial direction is provided in the approximate center of the guide portion 5d.
- FIG. 4A one groove 5f parallel to the axial direction is provided in the approximate center of the guide portion 5d.
- the groove 5f of the guide portion 5d has a wedge shape, and the convex tip is disposed on the outer diameter side. That is, the width of the groove 5f increases from the axial end on the outer diameter side of the cage toward the opposite end in the axial direction.
- the groove 5f can be easily formed simultaneously with the injection molding of the guide portion 5d.
- the retainer in the tapered roller bearing of the present invention is a resin molded body using a resin composition.
- Any resin composition can be used as long as it can be injection-molded and has sufficient heat resistance and mechanical strength as a cage material.
- these resins are fibers such as glass fibers, aramid fibers, carbon fibers, and various mineral fibers (whiskers) as long as they do not impair the injection moldability. It is preferable to mix a shape reinforcing material.
- inorganic fillers such as calcium silicate, clay, talc and mica, solid lubricants such as graphite, molybdenum disulfide, tungsten disulfide and polytetrafluoroethylene resin powder
- an antistatic agent, a conductive material, a pigment, a release material, and the like may be blended.
- tapered roller bearing of this invention with which a cage satisfy
- Tapered roller bearings are not limited to these.
- tapered roller bearing of the present invention in which the cage satisfies (A) and (2) will be described with reference to FIGS.
- the term “tapered roller bearing of the present invention” simply means the tapered roller bearing of the present invention in which the cage satisfies (A) and (2).
- FIG. 7 is an axial sectional view and an exploded view of a tapered roller bearing having no inner ring gavel
- FIG. 8 (a) is an axial sectional view of the cage
- FIG. 8 (b) is a cage. It is sectional drawing along the axis
- the tapered roller bearing 101 includes an inner ring 102 having a tapered raceway surface 102 a on the outer peripheral surface, an outer ring 103 having a tapered raceway surface 103 a on the inner peripheral surface, and a raceway surface 102 a of the inner ring 102.
- each raceway surface has a tapered shape in which the diameter constituting the raceway surface increases and decreases along the axial direction.
- the taper angle is not particularly limited, but is usually about 15 ° to 60 ° with respect to the axial direction.
- the inner ring 102 does not have a small flange on the small diameter side end, and the large ring 102 b is integrally formed on the large diameter side end of the inner ring 102.
- the tapered roller bearing according to the present invention may have a structure that eliminates at least the small wrinkles, and may have a structure that eliminates both the small and large wrinkles as necessary.
- the tapered roller bearing 101 is an integrated product 107 in which the cage 105 and the tapered roller 104 are integrated, and the integrated product 107, the inner ring 102, and the outer ring 103 are combined. Used by incorporating into the site. As described above, when the cage and the tapered roller are integrated, the tapered roller 104 does not fall off from the cage 105 during assembling (maintains integration). .
- the pocket portion of the cage has a claw portion that serves as a tapered roller fall-off preventing portion, and the tapered roller is incorporated into the pocket portion through elastic deformation of the claw portion and integrated with the cage. Has been.
- the cage 105 is formed by connecting a large-diameter ring portion 105a and a small-diameter ring portion 105b, which are rib portions, by a plurality of column portions 105c. Tapered rollers 104 are accommodated in the pocket portions 106 between the portions 105c.
- the cage 105 is an injection molded body formed by injection molding of a resin composition to be described later.
- a mold parting line X is formed on the column portion 105c by injection molding along the axial direction of the cage (also the axial direction of the bearing). The mold parting line X is shifted to the smaller diameter side from the center of the column part 105c.
- This injection mold consists of two dies with an axial draw, one of which is a mold on the larger diameter side (upper side in the figure) than the mold parting line X and the other is on the smaller side of the mold parting line X.
- This is a mold (lower side in the figure).
- both molds one is a fixed mold and the other is a movable mold.
- the mold on the larger diameter side (upper side in the figure) than the mold parting line X Moves to the left in the figure, and the smaller diameter side (the lower side in the figure) from the mold parting line X moves to the right in the figure.
- the mold parting line X can be varied between the large-diameter ring portion 105a and the small-diameter ring portion 105b in a range that does not reach these ring portions.
- the cage 105 has a tapered roller guide portion 105d on the larger diameter side than the mold dividing line X in the column portion 105c and on the inner diameter side of the cage, and has a larger diameter side than the mold dividing line X in the column portion 105c.
- a claw portion 105e for preventing the tapered roller from falling off is provided on the outer diameter side of the cage.
- the guide portion 105d is formed of a surface (guide surface) formed in a direction that narrows the circumferential width of the pocket opening. During operation, the tapered roller 104 rolls while contacting a part of the guide surface of the guide portion 105d.
- the shape of the guide surface may be a curved surface along a tapered roller or a flat surface (straight surface). Further, the guide part 105d forms a tapered opening along the generatrix of the tapered roller when viewed from the surface of the pocket opening.
- the guide portion 105d can prevent the tapered roller 104 from being detached from the side of the cage 105 where the guide portion 105d is formed.
- the tapered roller 104 is inserted into the pocket portion 106 of the cage 105 while the tapered portion 104 of the cage 105 is elastically deformed from the outer diameter side of the cage 105 while being elastically deformed.
- the guide portion 105d and the claw portion 105e are surrounded and held.
- Width t 3 of the taper direction of the guide portion 105d is preferably equal to or greater than 51% of the width of the taper direction of the pillar portion 105c b (equal to the width of the pocket). Thereby, the tapered roller can be held more stably. More preferably, it is 55% or more, more preferably 60% or more, and most preferably 65% or more.
- the guide portion 105d is formed continuously from the large-diameter ring portion 105a side to just before the mold parting line X. By adopting such a configuration, the width t 3 can be ensured as long as possible while keeping the diameter side larger than the mold parting line X.
- claw part 105e can be formed in arbitrary places if it is a larger diameter side from the metal mold
- the tapered roller is formed at a position where it can be easily held.
- two pieces of the same shape are formed apart within the width range of the guide portion 105d in the taper direction.
- the number of the claw portions is not limited to this, and it is sufficient that there are at least one claw portion, and three or more claw portions may be formed when more stable holding of the tapered rollers is required.
- both the guide part 105d and the claw part 105e are arranged on the larger diameter side from the mold parting line X, they are molded by the mold on the same side.
- a claw portion 105e is also formed by a mold for forming the guide portion 105d, and the claw portion 105e is forcibly removed. In this case, stress is generated in the nail portion, and there is a possibility that the tip is cracked or the root is whitened.
- the height of the claw part is h
- the claw part width in the columnar taper direction is t 1
- the claw part width in the cage axial direction is t 2 (see FIG. 8A)
- these values and injection molding Table 3 shows the results of verification of the relationship with cracking and whitening when forced.
- the cage material is made of PA66 resin (containing 30% by volume of glass fiber), and “ ⁇ ” in the table indicates that neither cracking nor whitening is observed, “ ⁇ ” indicates that there is no cracking but whitening is recognized, “X” indicates a case where cracks are observed.
- h / t 1 is 0.02 or more with respect to the claw width t 1 in the columnar taper direction, and the claw width t 2 in the cage axial direction.
- h / t 2 is 0.02 or more, it can be seen that cracking and whitening during forced injection molding can be prevented.
- the tip of the claw portion 105e in the thickness direction has an R shape. Thereby, a crack and whitening can be prevented more. In addition, burrs are unlikely to occur.
- Table 4 shows the results of verification of the relationship between the radius R and the height h of the claw, the relationship between cracking and whitening during forced injection molding, and the retainability of the tapered rollers.
- “ ⁇ ” for the retainability of the tapered roller indicates that there is no problem in retainability and injection molding
- “ ⁇ ” indicates that injection molding can be performed but whitening is observed
- “-” indicates that it has not been evaluated. It is.
- c is preferably 81% to 120% with respect to a.
- the ring rigidity of the cage can be improved. More preferably, it is 84 to 100%.
- a gate 108 which is a resin insertion port at the time of injection molding on the inner diameter side of the small-diameter ring portion 105b.
- a weld position can be set between the pillar parts of the large diameter ring part 105a, and the strength reduction of a holder
- the thickness of the small diameter ring portion 105b is 1.6 to 4 times the gate diameter. Thereby, it can shape
- the guide portion is wide, and the tapered roller can be stably held.
- the grooves 105f penetrating at both axial end portions are provided to promote the inflow of the lubricant to the guide surface.
- the guide 105d is discontinuous by the groove 105f.
- one groove 105f parallel to the axial direction is provided in the approximate center of the guide portion 105d.
- FIG. 9A one groove 105f parallel to the axial direction is provided in the approximate center of the guide portion 105d.
- the groove 105f of the guide portion 105d is formed in a wedge shape, and the side where the convex is widened is arranged on the inner diameter side. That is, the width of the groove 105f narrows from the axial end on the inner diameter side of the cage toward the opposite end in the axial direction.
- the groove 105f can be easily formed simultaneously with the injection molding of the guide portion 105d.
- the retainer in the tapered roller bearing of the present invention is a resin molded body using a resin composition.
- the resin composition is the same as that of the tapered roller bearing of the present invention in which the above-described cage satisfies (A) and (1).
- Japanese Patent Application Laid-Open No. 2007-32679 describes a shape in which the inner ring raceway is eliminated to increase the load capacity, and the raceway surface is secured by continuing the inner raceway surface to the end surface on the smaller diameter side of the inner ring.
- the tapered roller, the inner ring, and the cage are separated.
- JP 2007-32679 A and JP 2014-202284 A the shape of the cage is devised. Therefore, the tapered roller and the cage are integrated.
- conical surfaces are provided on the inner diameter side and the outer diameter side of the column part for the purpose of preventing the tapered roller from dropping off from the pocket part during assembly.
- the conical surface on the inner diameter side and the conical surface on the outer diameter side are formed diagonally on one side of the column portion.
- Japanese Patent Application Laid-Open No. 2014-202284 describes injection molding using two dies in the axial direction (axial draw) as a method of manufacturing a cage in which a tapered roller and a cage are integrated. ing.
- the tapered roller bearing 211 includes an inner ring 212 having a tapered raceway surface 212a on the outer peripheral surface, an outer ring 213 having a tapered raceway surface 213a on the inner peripheral surface, and a raceway surface 212a of the inner ring 212.
- the cage 215 is formed by connecting a large-diameter ring portion 215a and a small-diameter ring portion 215c with a plurality of column portions 215b, and houses a tapered roller 214 in a pocket portion between the column portions 215b. Further, the small collar at the small diameter side end of the inner ring 212 is omitted, and the large collar 212b is integrally formed at the large diameter side end of the inner ring 212.
- the inner ring in the tapered roller bearing has a tapered raceway surface, so that it has a small diameter side and a large diameter side when viewed in the axial direction, and the “small collar” is a collar provided at the end of the small diameter side.
- the “cradle” is a scissor provided at the end on the large diameter side.
- the conventional tapered roller bearing retainer has a structure including a small-diameter ring portion, a large-diameter ring portion, and a column portion.
- a bearing design that increases the dimension from the outer ring end surface to the cage end surface (the cage pull-in amount L 2 in FIG. 12) as much as possible, and there is a problem of interference with the small-diameter ring portion of the cage. Therefore, there was a limit to the expansion range.
- the tapered roller bearing of the present invention in which the cage satisfies (B) is to cope with such a problem, and the cage retracting amount can be increased without reducing the width of the large collar. Integration with the cage is possible.
- the tapered roller bearing of the present invention in which the cage satisfies (B) has the cage provided on a plurality of column portions and either the small-diameter side or the large-diameter side of the cage to surround the column portion.
- the cage when the ring portion is provided on the large-diameter side of the cage and the ring portion on the small-diameter side is omitted, the cage pull-in amount from the outer ring end surface can be greatly increased. . In addition, it is not necessary to forcefully reduce the width of the inner ring collar, and strength reduction can be prevented. Furthermore, the inner ring width can be reduced.
- the column part has a guide part of a tapered roller having a surface formed in a direction to narrow the circumferential width of the opening of the pocket part and a claw part for preventing the tapered roller from falling off, these and the above-mentioned protrusion
- the tapered roller and the cage can be integrated with each other while the small-diameter ring portion is omitted. As a result, it is possible to obtain a structure in which a small wrinkle is eliminated, and it is possible to increase the load capacity and reduce the size by extending the length of the tapered roller.
- the cage is an injection-molded body of a resin composition
- the guide portion, the claw portion, and the projection portion having the predetermined shape can be easily formed integrally with the cage body.
- the guide part and the claw part are on the same side (small diameter side or large diameter side) with respect to the mold parting line at the time of injection molding in the column part, molding with two dies by axial draw
- the guide part and the claw part can be formed by a mold on the same side, and the mold structure can be simplified.
- tapered roller bearing of the present invention in which the cage satisfies (B) will be described with reference to FIGS.
- the term “tapered roller bearing of the present invention” means the tapered roller bearing of the present invention in which the cage satisfies (B).
- FIG. 10 is an axial sectional view of a tapered roller bearing provided with a cage in which the small diameter side ring portion is omitted
- FIG. 11 is an axial sectional view of the cage (FIG. 11A) and an arrow A direction. It is a figure (FIG.11 (b)).
- the tapered roller bearing 201 includes an inner ring 202 having a tapered raceway surface 202 a on the outer peripheral surface, an outer ring 203 having a tapered raceway surface 203 a on the inner peripheral surface, and a raceway surface 202 a of the inner ring 202.
- Each raceway surface has a tapered shape in which the diameter constituting the raceway surface increases and decreases along the axial direction.
- the taper angle is not particularly limited, but is usually about 15 ° to 60 ° with respect to the axial direction. When the angle is steep, the moment rigidity becomes high.
- the retainer 205 includes a large-diameter ring portion 205a serving as a rib portion, and a plurality of column portions 205b connected to the large-diameter ring portion 205a.
- the plurality of column portions 205b are supported at equal intervals in the circumferential direction by the ring portion 205a.
- a pocket portion 206 is formed between adjacent column portions 205b, and protrudes toward the pocket portion side at the opposite end portion (small diameter side end portion) on the ring portion side of the column portion 205b.
- One end surface (small diameter end surface) of the tapered roller ) To support the protrusions 205c.
- the protrusion 205c is arranged so that its tapered roller support surface is flush with the small-diameter side pocket plane of the conventional product. Note that the position and shape of the protrusion 205c are not particularly limited as long as they can prevent the tapered roller from falling off. As shown in FIG. 10, in the tapered roller bearing 201 of the present invention, the tapered roller 204 is accommodated in the pocket portion 206.
- a large-diameter ring portion and a small-diameter ring portion are connected by a column portion to form a pocket portion, but the tapered roller bearing retainer of the present invention shown in FIG. Then, it is set as the structure (comb-type holder) which abbreviate
- the retainer of the tapered roller bearing of the present invention can prevent the tapered roller from falling off from the small diameter side while forming the above-described protrusion 205c without a small diameter ring portion.
- the small-diameter ring portion is omitted.
- the present invention is not limited to this, and the large-diameter ring portion is omitted, and the small-diameter ring portion and the column portion are included. It is good also as a structure.
- the small-diameter ring portion is omitted.
- the tapered roller bearing 201 is an integrated product in which the cage 205 and the tapered roller 204 are integrated, and the integrated product, the inner ring 202, and the outer ring 203 are combined and used in the target portion. In this way, when the cage and the tapered roller are integrated, the tapered roller 204 does not fall off from the cage 205 during the assembly (maintains integration), and thus a roller fall-off preventing structure is required.
- the pocket portion of the cage has the projection 205c and the drop-off preventing claw portion 205e (see FIG. 11A), and the tapered roller causes elastic deformation of the claw portion. After that, it is incorporated into the pocket and integrated with the cage.
- the tapered roller bearing 201 of the form shown in FIG. 10 does not have a small flange at the small diameter side end portion of the inner ring 202, and a large flange 202 b is integrally formed at the large diameter side end portion of the inner ring 202. Moreover, it is good also as a structure which lost both the small and large ridges.
- the cage is an injection-molded body formed by injection molding of a resin composition.
- the resin composition is the same as that of the tapered roller bearing of the present invention in which the above-described cage satisfies (A) and (1).
- the mold is divided by injection molding along the axial direction of the cage (also the axial direction of the bearing) on the column portion 205b.
- a line X is formed.
- the mold parting line X is shifted to the larger diameter side from the center of the column part 205b.
- This injection mold consists of two dies with an axial draw, one of which is a mold on the larger diameter side (upper side in the figure) than the mold parting line X and the other is on the smaller side of the mold parting line X. This is a mold (lower side in the figure).
- both molds one is a fixed mold and the other is a movable mold.
- the cage 205 in the form shown in FIG. 11 has a tapered roller guide portion 205d on the smaller diameter side than the mold dividing line X in the column portion 205b and on the outer diameter side of the cage, and the mold dividing line X in the column portion 205b.
- a claw portion 205e is provided on the smaller diameter side and the cage inner diameter side.
- the guide portion 205d is formed of a surface (guide surface) formed in a direction that narrows the circumferential width of the pocket opening. During operation, the tapered roller rolls while contacting a part of the guide surface of the guide portion 205d.
- the shape of the guide surface may be a curved surface along a tapered roller or a flat surface (straight surface).
- the guide part 205d forms a tapered opening along the generatrix of the tapered roller when viewed from the pocket opening surface.
- the guide portion 205d can prevent the tapered roller from coming off from the side of the cage 205 where the guide portion 205d is formed.
- the tapered roller is inserted into the pocket portion 206 of the cage 205 while being elastically deformed from the inner diameter side of the cage 205 while the hook portion 205e is elastically deformed. It is surrounded and held by the part 205a, the column part 205b, the guide part 205d, the claw part 205e, and the protrusion part 205c.
- the width in the taper direction of the guide portion 205d is preferably 51% or more of the width in the taper direction of the column portion 205b (same as the width of the pocket portion). Thereby, the tapered roller can be held more stably.
- the guide portion 205d is formed from the end on the small diameter side to the portion immediately before the mold dividing line X. Further, the claw portion 205e can be formed at any location as long as it is smaller than the mold parting line X and closer to the inner diameter of the cage. In view of the position of the guide portion 205d, it is preferable to form the tapered roller at a position where it can be easily held. In the form shown in FIG. 11A, two pieces of the same shape are formed apart from each other near the mold parting line X within the width range of the guide portion 205d in the taper direction.
- both the guide part 205d and the claw part 205e are arranged on the smaller diameter side with respect to the mold parting line X, they can be formed by a mold on the same side.
- the claw portion 205e is also formed by a mold for forming the guide portion 205d. Note that the claw portion 205e is not forcibly removed.
- the positional relationship among the guide portion, the claw portion, and the mold parting line X may be opposite to the case shown in FIG. That is, the cage has a tapered roller guide portion 205d on the larger diameter side than the mold dividing line X in the column portion 205b and on the inner diameter side of the cage, and has a larger diameter than the mold dividing line X in the column portion 205b. It is good also as a structure which has the nail
- the guide part 205d and the claw part 205e are both arranged on the larger diameter side than the mold parting line X, they are arranged on the same side (large diameter side) as in the case shown in FIG. Can be molded with a mold.
- Japanese Patent Application Laid-Open No. 2007-32679 describes a shape in which the inner ring raceway is eliminated to increase the load capacity, and the raceway surface is secured by continuing the inner ring raceway surface to the end surface on the smaller diameter side of the inner ring. .
- the tapered roller, the inner ring and the cage are separated.
- the tapered roller and the cage are devised by devising the shape of the cage. Are integrated.
- Japanese Patent Laid-Open No. 2014-202284 conical surfaces are provided on the inner diameter side and the outer diameter side of the column part for the purpose of preventing the tapered roller from falling off from the pocket part during assembly. Furthermore, Japanese Patent Application Laid-Open No. 2014-202284 describes injection molding using two dies in the axial direction (axial draw) as a method of manufacturing a cage in which a tapered roller and a cage are integrated. ing.
- the guide type of the cage is rolling element guidance, judging from the drawings and the like.
- the minimum size of the cage thickness of the resin cage used for the tapered roller bearing is determined from the production limit in the injection molding.
- a clearance between the cage outer circumferential surface and the outer ring raceway surface (hereinafter also simply referred to as “clearance”) is provided so that the cage outer circumferential surface does not contact the outer ring raceway surface during operation. It is necessary to provide it. If the bearing size is reduced, the cage thickness must also be reduced in order to ensure clearance.
- the thickness of the resin cage has a dimensional limit in manufacturing, and the clearance cannot be satisfactorily secured from a certain size or less, and considering the cage runout during operation, Some contact with the outer ring. This contact may cause wear on the outer peripheral surface of the cage and the raceway surface of the outer ring, and may cause problems such as breakage of the cage from an excessive load due to local contact.
- the tapered roller bearing Z is made in order to cope with such a problem. In a tapered roller bearing using a resin cage, even if the bearing size is small, the tapered roller bearing Z is localized to the cage.
- An object of the present invention is to provide a tapered roller bearing capable of suppressing wear of the outer ring raceway surface and cracking of the cage due to contact.
- the tapered roller bearing Z has the following features [1] to [6]. That is, [1] The tapered roller bearing Z includes an inner ring having a tapered raceway surface on an outer peripheral surface, an outer ring having a tapered raceway surface on an inner peripheral surface, and a raceway surface of the inner ring and a raceway surface of the outer ring. A tapered roller bearing, and the tapered roller bearing has a raceway surface of the outer ring and a bearing central axis.
- the angle formed is 30 ° to 50 °
- the retainer has a large-diameter ring portion, a small-diameter ring portion, and a plurality of column portions that connect the large-diameter ring portion, and the pocket between the adjacent column portions.
- a portion is formed and is guided by the outer ring, the inner ring, or another member disposed on the outer diameter side of the outer ring.
- the cage has a tapered outer peripheral surface formed by the surface of the column part, and the outer peripheral surface is in contact with the raceway surface of the outer ring to guide the outer ring.
- the inclination angle of the outer peripheral surface of the cage and the inclination angle of the raceway surface of the outer ring are the same angle.
- the cage is characterized in that the outer peripheral surface of the large-diameter ring portion contacts the other member and is guided to the other member.
- the cage is characterized in that the inner peripheral surface of the large-diameter ring portion is in contact with the inner ring and guided to the inner ring.
- the tapered roller bearing has a radial thickness of 13.5 mm or less.
- the inner ring has a structure that does not have a small wrinkle at a small-diameter side end, or a structure that does not have a small wrinkle at a small-diameter side end and a large-diameter side end.
- the retainer has a drop-off preventing portion for the tapered roller in the pocket portion, and the tapered roller is held in the pocket portion by the drop-out preventing portion.
- the tapered roller bearing Z is a tapered roller bearing with a steep contact angle (the angle between the outer ring raceway surface and the bearing center axis is 30 ° to 50 °), and includes a large-diameter ring portion, a small-diameter ring portion, and In a configuration using a resin cage having a plurality of column portions to be connected and having pocket portions formed between adjacent column portions, the cage is not a rolling element guide but an outer ring, an inner ring Or other members arranged on the outer diameter side of the outer ring, so that even if the bearing size is small (for example, the radial thickness is 13.5 mm or less), it is localized with the cage. It is possible to suppress wear of the outer ring raceway surface and cracking of the cage due to contact.
- the cage has a tapered outer circumferential surface formed of the surface of the column portion, the outer circumferential surface is in contact with the raceway surface of the outer ring and guided to the outer ring, and the outer circumference of the cage is Since the inclination angle of the surface and the inclination angle of the raceway surface of the outer ring are the same angle, even if the clearance between the outer peripheral surface of the cage and the raceway surface of the outer ring is small, these both surfaces are in local contact with each other on the small diameter side of the cage Can be prevented, wear of the contact surface can be prevented, and the load on the cage can be reduced.
- the outer peripheral surface of the large-diameter ring part comes into contact with the other member and is guided by the other member, or as the third cage guide form, the inner peripheral surface of the large-diameter ring part Since the inner ring contacts with the inner ring and is guided to the inner ring, the cage does not directly contact the outer ring raceway surface, and wear and scratches on the raceway surface can be prevented.
- the inner ring has a structure that does not have a small edge at the small diameter side end, or a structure that does not have a small edge at the small diameter side end and does not have a large flange at the large diameter side end.
- the pocket part has a drop-off prevention part for the tapered roller, and the tapered part is held in the pocket part by the drop-off prevention part.
- the tapered roller can be prevented from falling off from the cage during assembly with a predetermined integrated structure while increasing the size and reducing the size.
- tapered roller bearing Z (radial tapered roller bearings) are applied in the case of (1) a steep gradient (contact angle: 30 ° to 50 °) and (2) a resin cage.
- the contact angle is an angle formed by the raceway surface of the outer ring and the bearing central axis.
- the thickness of the resin cage has a dimensional limit in the production of injection molding.
- Conventional resin cages are guided by rolling elements, but in the case of the steep gradient as described above, if the radial thickness of the bearing is thin, a clearance (clearance) between the outer circumferential surface of the cage and the outer ring raceway surface can be secured. There is a risk of contact.
- Table 5 shows the results of verifying the relationship between the radial thickness and the clearance (presence / absence of contact between the outer ring and the cage) when a resin cage having a contact angle of 45 ° is used.
- Table 5 shows the results of verifying the relationship between the radial thickness and the clearance (presence / absence of contact between the outer ring and the cage) when a resin cage having a contact angle of 45 ° is used.
- the radial thickness is 13.5 mm or less
- the outer ring raceway surface and the cage outer peripheral surface come into contact with each other due to the swing of the cage during operation.
- the relationship is almost the same in the contact angle range of 30 ° to 50 °.
- the tapered roller bearing Z is particularly suitable for a cage in which the radial thickness of the tapered roller bearing is 13.5 mm or less.
- the bearing inner diameter is about 170 mm or less.
- FIG. 13 is a partial cross-sectional view in the axial direction of the tapered roller bearing.
- the tapered roller bearing 301 includes an inner ring 302 having a tapered raceway surface 302 a on the outer peripheral surface, an outer ring 303 having a tapered raceway surface 303 a on the inner peripheral surface, and a raceway surface 302 a of the inner ring 302.
- each raceway surface has a tapered shape in which the diameter constituting the raceway surface increases and decreases along the axial direction.
- the contact angle of the tapered roller bearing raceways 303a of the outer ring 303 is an angle formed between the bearing center axis, theta 1 in the drawing corresponds to this.
- the tapered roller bearing Z is a tapered roller bearing having a contact angle of 30 ° to 50 °.
- the cage 305 is formed by connecting a large-diameter ring portion 305a and a small-diameter ring portion 305b, which are rib portions, by a plurality of column portions 305c, and stores the tapered rollers 304 in pocket portions 306 between the column portions 305c. ing.
- the cage 305 is a resin cage made by injection molding of a resin composition.
- the cage 305 has a tapered outer peripheral surface 305d made of the surface of the column portion 305c.
- a clearance A is provided between the outer peripheral surface 305 d and the raceway surface 303 a of the outer ring 303.
- the outer peripheral surface 305d comes into contact with the raceway surface 303a of the outer ring 303, whereby the cage 305 is guided to the outer ring 303 (outer ring side guide 1).
- the inclination angle ⁇ 2 of the outer peripheral surface 305 d of the cage 305 and the inclination angle ⁇ 1 of the raceway surface 303 a of the outer ring 303 are the same angle. That is, both surfaces are parallel, and the cage 305 is guided to the raceway surface 303a of the outer ring 303 over the entire outer peripheral surface 305d.
- Each inclination angle is an angle with respect to the bearing central axis (center in the radial direction).
- FIG. 14 is a partial cross-sectional view in the axial direction of the tapered roller bearing.
- a sliding member 307 is provided on the outer peripheral surface of the large-diameter ring portion 305 a in the cage 305.
- reference numeral 308 denotes an outer member arranged on the outer ring outer diameter side such as a housing.
- the other overall configuration is the same as that of the tapered roller bearing shown in FIG.
- a clearance B between the outer peripheral surface of the large-diameter ring portion 305 a and the outer member 308 is set to be smaller than a clearance A between the outer peripheral surface 305 d of the cage 305 and the raceway surface 303 a of the outer ring 303. Therefore, during operation, the outer peripheral surface of the large-diameter ring portion 305a comes into contact with the surface of the outer member 308, so that the cage 305 is guided to the outer member 308 (outer ring side guide 2).
- the outer peripheral surface 305d of the cage 305 and the raceway surface 303a of the outer ring 303 need not be parallel. If they are not parallel, the clearance A varies depending on the position, but if the minimum value is larger than the clearance B, the guide is provided by the large-diameter ring portion 305a.
- the sliding member 307 is not particularly limited as long as it has wear resistance and slidability, and a member made of a known sliding material such as a resin material (including a coating) or a ceramic material can be applied.
- a member made of a known sliding material such as a resin material (including a coating) or a ceramic material can be applied.
- the cage 305 does not directly contact the raceway surface 303a of the outer ring 303, and wear and scratches on the raceway surface 303a can be prevented.
- the sliding member 307 excellent in wear resistance and sliding property is provided on the outer peripheral surface of the large-diameter ring portion 305a, the bearing torque can be reduced by reducing the frictional force, and the cage load can be reduced.
- FIG. 15 is a partial cross-sectional view in the axial direction of the tapered roller bearing.
- a sliding member 307 is provided on the inner peripheral surface of the large-diameter ring portion 305 a in the cage 305.
- the other overall configuration is the same as that of the tapered roller bearing shown in FIG.
- the clearance C between the inner peripheral surface of the large-diameter ring portion 305a and the inner ring 302 is set to be smaller than the clearance A between the outer peripheral surface 305d of the cage 305 and the raceway surface 303a of the outer ring 303.
- the cage 305 is guided to the inner ring 302 (inner ring side guide) by the inner peripheral surface of the large diameter ring portion 305a coming into contact with the surface of the inner ring 302 (the outer diameter portion of the large collar 302b).
- the outer peripheral surface 305d of the cage 305 and the raceway surface 303a of the outer ring 303 may not be parallel.
- the retainer 305 is not in direct contact with the raceway surface 303a of the outer ring 303, and wear and scratches on the raceway surface 303a can be prevented, as in the embodiment of FIG. Further, since the sliding member 307 having excellent wear resistance and sliding property is provided on the inner peripheral surface of the large-diameter ring portion 305a, the bearing torque can be reduced by reducing the frictional force, and the cage load can be reduced.
- the material of the sliding member 307 is the same as that in the case of FIG.
- the tapered roller bearing Z is preferably an integrated product in which a resin cage and a tapered roller are integrated, and this integrated product, an inner ring, and an outer ring are combined and used in a target part.
- the tapered roller does not fall off from the cage during assembling (maintains integration), and thus a roller fall-off preventing structure is required.
- a taper roller drop-off preventing portion is provided in the pocket portion of the cage, and the tapered roller is incorporated into the pocket portion through elastic deformation of the drop-off preventing portion and integrated with the cage.
- the inner ring gavel can be omitted.
- 13 to 15 is formed by integrating a cage and a tapered roller, and does not have a small flange at the small-diameter side end of the inner ring 302, and has a large-diameter side end of the inner ring 302.
- a large spear 302b is integrally formed on the part. Moreover, it is good also as a structure which lost both the small and large ridges.
- a concave portion (bump) is provided on each end face of the tapered roller, and a convex portion (protrusion) engaged with the concave portion through elastic deformation as a drop-off preventing portion in the pocket portion of the cage. ) Is provided.
- the tapered roller is inserted into (inserted into) the pocket of the retainer while elastically deforming the catching amount of these uneven portions, so that the recess of the tapered roller and the convex of the retainer are engaged.
- the retainer and the tapered roller are integrated.
- the tapered rollers are left as they are and a claw portion serving as a tapered roller falling-off preventing portion is provided in the pocket portion of the cage.
- the tapered roller is incorporated into the pocket portion through elastic deformation of the claw portion, and is integrated with the cage.
- the cage is preferably an injection-molded body obtained by injection-molding a resin composition.
- the resin composition is the same as that of the tapered roller bearing of the present invention in which the above-described cage satisfies (A) and (1).
- the type guided on the outer peripheral surface of the cage (the above-mentioned outer ring side guide 1), it is preferable to blend a filler or additive excellent in wear resistance and sliding property.
- tapered roller bearing Z is not limited to these.
- the tapered roller bearing of the present invention includes a resin cage that can stably hold the tapered roller when integrating the tapered roller and the cage, while enabling molding with a simple mold. Tapered rollers can be prevented from falling off when assembled in a structure that does not have a small wrinkle, and can be suitably used as industrial tapered roller bearings that are loaded with a high moment load and require a high rigidity function, such as for industrial robots.
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- Rolling Contact Bearings (AREA)
Abstract
Description
上記保持器は、樹脂組成物を射出成形してなる射出成形体であり、
上記保持器は、
(A)大径リング部と、小径リング部と、これらを連結する複数の柱部とを有し、隣接する柱部同士の間に上記ポケット部が形成されているか、または、
(B)複数の柱部と、該保持器の小径側および大径側のいずれか一方に設けられて上記柱部を周方向等間隔で支持するリング部とから構成され、隣接する上記柱部同士の間に上記ポケット部が形成され、上記柱部の上記リング部側の反対側端部に、上記ポケット部側に突出し、上記円すいころの一端面を支持する突起部を有し、
上記保持器は、
(1)上記柱部に軸方向に沿った上記射出成形による金型分割線が形成され、該柱部における上記分割線よりも小径側かつ保持器外径側に、上記ポケット部開口の周方向幅を狭くする方向に形成された面からなる上記円すいころの案内部を有し、該柱部における上記分割線よりも小径側かつ保持器内径側に、上記円すいころの脱落防止用の爪部を有するか、または、
(2)上記柱部に軸方向に沿った上記射出成形による金型分割線が形成され、該柱部における上記分割線よりも大径側かつ保持器内径側に、上記ポケット部開口の周方向幅を狭くする方向に形成された面からなる上記円すいころの案内部を有し、該柱部における上記分割線よりも大径側かつ保持器外径側に、上記円すいころの脱落防止用の爪部を有することを特徴とする。
上記保持器は、樹脂組成物を射出成形してなる射出成形体であり、
上記保持器は、
(A)大径リング部と、小径リング部と、これらを連結する複数の柱部とを有し、隣接する柱部同士の間に上記ポケット部が形成されているか、または、
(B)複数の柱部と、該保持器の小径側および大径側のいずれか一方に設けられて上記柱部を周方向等間隔で支持するリング部とから構成され、隣接する上記柱部同士の間に上記ポケット部が形成され、上記柱部の上記リング部側の反対側端部に、上記ポケット部側に突出し、上記円すいころの一端面を支持する突起部を有し、
上記保持器は、
(1)上記柱部に軸方向に沿った上記射出成形による金型分割線が形成され、該柱部における上記分割線よりも小径側かつ保持器外径側に、上記ポケット部開口の周方向幅を狭くする方向に形成された面からなる上記円すいころの案内部を有し、該柱部における上記分割線よりも小径側かつ保持器内径側に、上記円すいころの脱落防止用の爪部を有するか、または、
(2)上記柱部に軸方向に沿った上記射出成形による金型分割線が形成され、該柱部における上記分割線よりも大径側かつ保持器内径側に、上記ポケット部開口の周方向幅を狭くする方向に形成された面からなる上記円すいころの案内部を有し、該柱部における上記分割線よりも大径側かつ保持器外径側に、上記円すいころの脱落防止用の爪部を有する。
[1]円すいころ軸受Zは、外周面にテーパ状の軌道面を有する内輪と、内周面にテーパ状の軌道面を有する外輪と、上記内輪の軌道面と上記外輪の軌道面との間を転動する複数の円すいころと、上記円すいころをポケット部で転動自在に保持する樹脂製の保持器とを備えてなり、該円すいころ軸受は、上記外輪の軌道面が軸受中心軸となす角度が30°~50°であり、上記保持器は、大径リング部と、小径リング部と、これらを連結する複数の柱部とを有し、隣接する柱部同士の間に上記ポケット部が形成され、上記外輪、上記内輪、または上記外輪外径側に配置される他部材で案内されることを特徴とする。
円すいころ軸受Z(ラジアル円すいころ軸受)は、(1)接触角が急こう配(接触角:30°~50°)であり、かつ、(2)樹脂製保持器の場合に適用される。なお、接触角は、外輪の軌道面が軸受中心軸となす角度である。樹脂製保持器の肉厚は射出成形製造上の寸法限界がある。従来の樹脂製保持器は転動体案内されるが、上記のような急こう配の場合、軸受の径方向肉厚が薄いと、保持器外周面と外輪軌道面との隙間(クリアランス)が確保できずに、接触するおそれがある。この関係を図16により具体的に説明する。軸受の径方向肉厚がH1からH2に薄くなると、保持器肉厚は一定以下とできないため、クリアランスもD1からD2に小さくなる。従来の保持器の外周面角度と外輪軌道面の角度は、コーンセンタが一致するように設計されており、両面は平行にはなっていない。このため、上記のようにクリアランスが小さくなると保持器外周面の小径側Xで外輪との接触が起こり得る。この接触により、外輪軌道面に傷や摩耗が生じるおそれや、樹脂製保持器の外周面に摩耗や局部的な接触による過大な負荷が生じるおそれがある。
2 内輪
3 外輪
4 円すいころ
5 保持器
6 ポケット部
7 一体品
8 ゲート
9 ウェルド位置
101 円すいころ軸受
102 内輪
103 外輪
104 円すいころ
105 保持器
106 ポケット部
107 一体品
108 ゲート
201 円すいころ軸受
202 内輪
203 外輪
204 円すいころ
205 保持器
206 ポケット部
301 円すいころ軸受
302 内輪
303 外輪
304 円すいころ
305 保持器
306 ポケット部
307 摺動部材
308 外方部材
Claims (9)
- 外周面にテーパ状の軌道面を有する内輪と、内周面にテーパ状の軌道面を有する外輪と、前記内輪の軌道面と前記外輪の軌道面との間を転動する複数の円すいころと、前記円すいころをポケット部で転動自在に保持する保持器とを備えてなる円すいころ軸受であって、
前記保持器は、樹脂組成物を射出成形してなる射出成形体であり、
前記保持器は、
(A)大径リング部と、小径リング部と、これらを連結する複数の柱部とを有し、隣接する柱部同士の間に前記ポケット部が形成されているか、または、
(B)複数の柱部と、該保持器の小径側および大径側のいずれか一方に設けられて前記柱部を周方向等間隔で支持するリング部とから構成され、隣接する前記柱部同士の間に前記ポケット部が形成され、前記柱部の前記リング部側の反対側端部に、前記ポケット部側に突出し、前記円すいころの一端面を支持する突起部を有し、
前記保持器は、
(1)前記柱部に軸方向に沿った前記射出成形による金型分割線が形成され、該柱部における前記分割線よりも小径側かつ保持器外径側に、前記ポケット部開口の周方向幅を狭くする方向に形成された面からなる前記円すいころの案内部を有し、該柱部における前記分割線よりも小径側かつ保持器内径側に、前記円すいころの脱落防止用の爪部を有するか、または、
(2)前記柱部に軸方向に沿った前記射出成形による金型分割線が形成され、該柱部における前記分割線よりも大径側かつ保持器内径側に、前記ポケット部開口の周方向幅を狭くする方向に形成された面からなる前記円すいころの案内部を有し、該柱部における前記分割線よりも大径側かつ保持器外径側に、前記円すいころの脱落防止用の爪部を有することを特徴とする円すいころ軸受。 - 前記保持器が前記(B)を満たし、前記リング部が該保持器の大径側に設けられていることを特徴とする請求項1記載の円すいころ軸受。
- 前記内輪は、小径側端部に小鍔を有さない構造、または、小径側端部に小鍔を有さず、かつ大径側端部に大鍔を有さない構造であることを特徴とする請求項1記載の円すいころ軸受。
- 前記案内部のテーパ方向の幅が、前記柱部のテーパ方向の幅の51%以上であることを特徴とする請求項1記載の円すいころ軸受。
- 前記案内部と前記脱落防止用の爪部とが同一の金型により成形され、前記爪部が無理抜きにて成形されたことを特徴とする請求項1記載の円すいころ軸受。
- 前記爪部の高さhは、前記柱部のテーパ方向の爪部幅t1に対してh/t1が0.02以上、かつ、保持器軸方向の爪部幅t2に対して h/t2が0.02以上であることを特徴とする請求項1記載の円すいころ軸受。
- 前記案内部において、その軸方向両端部に貫通する溝を有することを特徴とする請求項1記載の円すいころ軸受。
- 前記保持器は前記(1)を満たし、前記溝が、保持器外径側の軸方向端部から、軸方向反対端部に向けて、溝幅が広がる形状であることを特徴とする請求項7記載の円すいころ軸受。
- 前記保持器は前記(2)を満たし、前記溝が、保持器内径側の軸方向端部から、軸方向反対端部に向けて、溝幅が狭まる形状であることを特徴とする請求項7記載の円すいころ軸受。
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US15/565,676 US10378580B2 (en) | 2015-04-10 | 2016-04-08 | Tapered roller bearing |
DE112016001671.9T DE112016001671T5 (de) | 2015-04-10 | 2016-04-08 | Kegelrollenlager |
KR1020177032310A KR102544828B1 (ko) | 2015-04-10 | 2016-04-08 | 테이퍼 롤러 베어링 |
CN201680021019.1A CN107532650B (zh) | 2015-04-10 | 2016-04-08 | 圆锥滚子轴承 |
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JP2015-081122 | 2015-04-10 | ||
JP2015081122A JP6595791B2 (ja) | 2015-04-10 | 2015-04-10 | 円すいころ軸受 |
JP2015-121277 | 2015-06-16 | ||
JP2015121277A JP2017008952A (ja) | 2015-06-16 | 2015-06-16 | 円すいころ軸受 |
JP2015163348A JP2017040329A (ja) | 2015-08-21 | 2015-08-21 | 円すいころ軸受 |
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JP6556454B2 (ja) * | 2014-09-30 | 2019-08-07 | Ntn株式会社 | 玉軸受用保持器 |
US10520017B2 (en) * | 2017-12-26 | 2019-12-31 | Jtekt Corporation | Tapered roller bearing |
JP7271087B2 (ja) * | 2018-03-28 | 2023-05-11 | Ntn株式会社 | 円すいころ軸受 |
JP6778310B2 (ja) * | 2018-12-07 | 2020-10-28 | Ntn株式会社 | 円すいころ軸受 |
US11460071B2 (en) | 2018-12-07 | 2022-10-04 | Ntn Corporation | Tapered roller bearing |
JP7381894B2 (ja) * | 2020-04-15 | 2023-11-16 | 中西金属工業株式会社 | ストラットベアリングの上側ケースの製造方法、及びストラットベアリング |
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