WO2018092707A1 - 転がり軸受用保持器、及び転がり軸受 - Google Patents
転がり軸受用保持器、及び転がり軸受 Download PDFInfo
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- WO2018092707A1 WO2018092707A1 PCT/JP2017/040711 JP2017040711W WO2018092707A1 WO 2018092707 A1 WO2018092707 A1 WO 2018092707A1 JP 2017040711 W JP2017040711 W JP 2017040711W WO 2018092707 A1 WO2018092707 A1 WO 2018092707A1
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- Prior art keywords
- cage
- rolling
- rolling element
- ball
- rolling bearing
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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
- F16C33/3837—Massive or moulded cages having cage pockets surrounding the balls, e.g. machined window cages
- F16C33/3843—Massive or moulded cages having cage pockets surrounding the balls, e.g. machined window cages formed as one-piece cages, i.e. monoblock cages
- F16C33/3856—Massive or moulded cages having cage pockets surrounding the balls, 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
- 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
- F16C19/04—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for radial load mainly
- F16C19/06—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for radial load mainly with a single row or balls
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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
- F16C19/14—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for both radial and axial load
- F16C19/16—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for both radial and axial load with a single row of balls
- F16C19/163—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for both radial and axial load with a single row of balls with angular contact
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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
- F16C33/41—Ball cages comb-shaped
- F16C33/412—Massive or moulded comb cages, e.g. snap ball cages
- F16C33/414—Massive or moulded comb cages, e.g. snap ball cages formed as one-piece cages, i.e. monoblock comb cages
- F16C33/416—Massive or moulded comb cages, e.g. snap ball cages formed as one-piece cages, i.e. monoblock comb cages made from plastic, e.g. injection moulded comb 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
- F16C33/38—Ball cages
- F16C33/44—Selection of substances
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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
- F16C2240/00—Specified values or numerical ranges of parameters; Relations between them
- F16C2240/30—Angles, e.g. inclinations
- F16C2240/34—Contact angles
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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
- F16C2322/00—Apparatus used in shaping articles
- F16C2322/39—General buildup of machine tools, e.g. spindles, slides, actuators
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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
- F16C33/3887—Details of individual pockets, e.g. shape or ball retaining means
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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
- F16C33/41—Ball cages comb-shaped
- F16C33/418—Details of individual pockets, e.g. shape or ball retaining means
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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
Definitions
- the present invention relates to a rolling bearing retainer and a rolling bearing, and more specifically, general industrial machines and machine tools such as rolling bearings for machine tool spindles and ball screw support bearings, and other vehicles such as railways and aviation.
- the present invention relates to a rolling bearing cage and a rolling bearing that are applied to a portion that rotates at a high speed.
- a cage for a rolling bearing is usually used for the purpose of causing the bearing to rotate smoothly without causing any competition between the cage and other members, and suppressing the rampage of the cage. And an appropriate gap amount is set between the other members.
- the cage used for the rolling bearing is roughly classified into two types: a bearing ring guide type cage that is guided to rotate by the bearing ring and a rolling element guide type cage that is guided to rotate by the rolling element.
- a rolling element guide type cage is often used for the driving motor bearing mainly for cost reasons, and in particular, one of the pockets of the cage is used for reasons of bearing assembly. Often an open crown holder is selected.
- the crown type cage Because of its shape, the crown type cage has a characteristic that the amount of cage deformation due to centrifugal force, particularly the increase in the circumferential length of the pocket, is large compared to other types of cages. Since it is very difficult to maintain the gap amount with respect to the increase in the speed, improvement is particularly required.
- the present invention has been made in view of the above-described problems, and an object of the present invention is to suppress an increase in the gap amount between the cage and the rolling element due to the centrifugal force of the cage, and to maintain the cage in a wide rotational speed range. It is to propose a rolling element guide type rolling bearing cage and a rolling bearing that can maintain an appropriate gap amount between the rolling element and the cage, thereby suppressing cage noise.
- a rolling element guide type rolling bearing retainer having a plurality of pockets provided at predetermined intervals in the circumferential direction and each holding a plurality of rolling elements,
- the cage pocket has a straight surface parallel to a straight line connecting the center of the rolling element and the rotation axis at a neutral position where the revolution axis of the rolling element and the rotation axis of the cage coincide with each other.
- a taper surface connected to the straight surface on the inner diameter side of the straight surface, and extending toward the straight line as it is radially away from the straight surface; The tapered surface is formed so as to be in surface contact with the rolling element when the rolling element and the cage are relatively moved along the straight line.
- the connecting point between the straight surface and the tapered surface passes through the center of the rolling element and is closer to the inner diameter side than the intersection of the extension surface of the rolling element equatorial plane and the wall surface of the pocket that is perpendicular to the straight line. Formed, In a two-dimensional section passing through the centers of the plurality of rolling elements, at the neutral position, the distance between the rolling elements and the wall surface of the pocket in the extended surface of the rolling element equatorial plane is the taper in a direction perpendicular to the straight line.
- the angle formed between the line connecting the contact point and the center of the rolling element and the extended surface of the rolling element equatorial plane is the intersection of the shoulder outer maximum diameter of the inner ring and the contour of the rolling element
- the rolling bearing retainer according to (1), which is large.
- the cage is a crown type cage having an annular part and a plurality of pillars extending in the axial direction from the annular part (1) or (2) Roller bearing retainer as described in 1.
- the center position of the rolling element is offset from the center positions of the inner ring and the outer ring so as to be separated from the annular portion. Roller bearing cage.
- the cage pocket has a straight surface and a tapered surface with which the rolling element comes into surface contact.
- the connecting point between the straight surface and the tapered surface is formed on the inner diameter side of the intersection of the extended surface of the rolling element equatorial surface and the wall surface of the pocket, and in a two-dimensional section passing through the centers of the plurality of rolling elements.
- the distance between the rolling element and the wall surface of the pocket in the extended surface of the rolling element equatorial plane is smaller than the shortest distance between the tapered surface and the rolling element in the direction perpendicular to the radial direction.
- the rolling elements and the cage are relatively moved in the radial direction, and the contact points formed when the tapered surface and the rolling elements are brought into contact with the rolling points.
- the angle between the line connecting the center of the moving body and the extended surface of the rolling body equatorial plane is the line connecting the intersection of the maximum outer diameter of the shoulder of the inner ring and the contour of the rolling body and the center of the rolling body, It is smaller than the angle formed with the extended surface of the rolling element equatorial plane.
- FIG. 2 is a cross-sectional view taken along the line II-II in FIG. 1, showing a state in which the ball and the cage of the first embodiment are in a neutral position. It is the figure which looked at the ball and cage of Drawing 2 from the radial direction. It is a figure which shows the state which the ball
- (A) is a figure which shows the state which the ball
- (b) It is a figure which shows the state where the ball
- (A) is a figure which shows the state in which the cage
- (A) is a figure which shows the state which has the cage
- (b) is a ball
- (A) is sectional drawing of a deep groove ball bearing provided with the cage for rolling bearings concerning 2nd Embodiment of this invention
- (b) is the figure which looked at the ball
- (A)-(d) is sectional drawing of the deep groove ball bearing provided with each modification of the rolling bearing retainer which changed the shape of the internal-diameter side convex part, respectively.
- (A)-(c) is the figure which looked at each modification of the rolling bearing retainer which changed the axial direction position of the internal diameter side convex part from the radial direction.
- (A) And (b) is the figure seen from the radial direction which shows each modification of the cage for rolling bearings.
- the deep groove ball bearing 1 having the crown type cage 11 according to the first embodiment of the present invention includes an outer ring 3 having an outer ring raceway surface 3a on an inner peripheral surface, an inner ring 5 having an inner ring raceway surface 5a on an outer peripheral surface, an outer ring raceway surface 3a and an inner ring raceway surface 5a.
- grease as a lubricant is enclosed in the internal space of the deep groove ball bearing 1.
- the lubricant may be oil.
- shoulder portions 3b are formed on both axial sides of the outer ring raceway surface 3a, and on the outer peripheral surface of the inner ring 5, shoulder portions 5b are formed on both axial sides of the inner ring raceway surface 5a. ing.
- the crown type cage 11 is a ball guide type cage made of synthetic resin, and the annular portion 15 and the axial direction at predetermined intervals in the circumferential direction from the annular portion 15.
- a plurality of pockets 9 that hold the ball 7 in a rollable manner are formed by the annular portion 15 and the adjacent column portions 17 and 17. Therefore, the pocket 9 is opened on both sides in the radial direction and is opened on one axial side (the right side in FIG. 1).
- Synthetic resin materials for the crown-shaped cage 11 are made of synthetic resin materials such as polyamide, polyacetal, polyether ether ketone, polyimide, polyphenylene sulfide, etc., and if necessary, the resin may be glass fiber, carbon fiber, aramid fiber. A reinforcing material such as may be added.
- the pocket 9 of the crown-shaped cage 11 rotates with the center O of the ball 7 at a neutral position where the revolution axis X1 of the ball 7 and the rotation axis X2 of the crown-shaped cage 11 coincide.
- the straight surface 9a is formed in a cylindrical shape with the straight line L as the central axis
- the tapered surface 9b is formed in a conical shape with the straight line L as the central axis.
- inner diameter side convex part 19 which protrudes in the axial direction intermediate part of the crown type holder
- Inner diameter side convex portions 19 and 19 are formed symmetrically with respect to the axial center, and as shown in FIG. 1, inclined surfaces are formed on both axial sides so that the axial width becomes narrower toward the radially inner side. 19a. Further, as shown in FIG.
- the inner diameter side convex portions 19, 19 when viewed from the radially outer side, have other inclined surfaces 19 b on both sides in the axial direction so that the axial width becomes narrower toward the center of the pocket 9.
- the minimum inner diameter ⁇ d of the inner diameter side convex portion 19 is larger than at least one of the maximum outer diameters ⁇ D of the shoulder portions 5 b of the inner ring 5.
- the inner diameter side convex part 19 which forms the taper surface 9b is not provided in the other axial side in the pocket 9 (left side in FIG. 1, FIG. 3), there is a gap between the pocket 9 and the ball 7. And the lubricant can be supplied from the gap.
- the crown type cage 11 of the present embodiment as described above, an increase in the gap amount between the cage 11 and the balls 7 due to the centrifugal force of the cage 11 is suppressed, and the crown type cage 11 is held in a wide rotational speed range. An appropriate gap amount between the container 11 and the ball 7 is maintained to suppress the cage sound. Therefore, among the gaps of the crown-shaped cage 11, the clearance in the rotational direction of the cage 11 formed between the pocket 9 of the cage 11 and the balls 7 (hereinafter referred to as pocket gap (2 ⁇ P)), It is important to define a radial clearance (hereinafter referred to as “cage radial movement amount (2 ⁇ R))” of the cage 11 formed between the pocket 9 of the cage 11 and the ball 7.
- the pair of tapered surfaces 9b are in surface contact with the balls 7 when the balls 7 and the cage 11 are relatively moved along the straight line L (that is, in the radial direction). Formed as follows. Further, as shown in FIG. 5A, the crown-shaped cage 11 is in surface contact with the ball 7 even when the pocket circumferential direction length of the cage 11 increases due to centrifugal force and moves in the radial direction. Formed as follows. Further, in this case, the contact position of the ball 7 with the tapered surface 9b does not change before and after the crown type cage 11 is deformed.
- connection point 9 c between the straight surface 9 a and the tapered surface 9 b passes through the center O of the ball 7 and is perpendicular to the straight line L. It forms in the inner diameter side rather than the cross
- FIG. 1 in a two-dimensional cross section passing through the center O of the plurality of balls 7, at the neutral position shown in FIG.
- the distance ⁇ P between the ball 7 and the wall surface of the pocket 9 on the extended surface F of the rolling body equatorial plane is It is designed to be smaller than the shortest distance ⁇ T between the tapered surface 9b and the ball 7 in the direction perpendicular to L (direction F ′ parallel to the extended surface F of the rolling element equatorial plane).
- the pocket clearance (2 ⁇ P) can be determined by only the ball 7 and the straight surface 9a without receiving interference from the tapered surface 9b. That is, when the cage 11 moves in parallel with the ball 7 on the revolution axis X1 of the ball 7 and comes into contact with the ball 7, the cage 11 reacts in the direction opposite to the moving direction. Rampage can be suppressed. That is, it can be suppressed that the ball 7 comes into contact with the tapered surface 9b first, and a reaction force is generated in the radial direction of the cage 11 to cause the cage 11 to be violated. Further, the friction between the pocket 9 and the ball 7 is also reduced, and it is possible to suppress an increase in torque, heat generation, and the like.
- the balls 7 and the cage 11 are relatively moved along the straight line L to form a tapered surface.
- the angle ⁇ formed between the line a connecting the contact point P 1 formed when the ball 9 b and the ball 7 are brought into contact with the center O of the ball 7 and the extended surface F of the rolling body equatorial plane is determined by the inner ring 5.
- the minimum inner diameter ⁇ d of the cage 11 must be larger than at least one of the shoulder outer maximum diameters ⁇ D of the inner ring 5 in order to secure the bearing assembly.
- the angle ⁇ needs to be smaller than the angle ⁇ under the condition that the cage 11 is in contact with the ball 7. .
- FIG. 4 shows the relationship between ⁇ and ⁇ when the taper gradient angle ⁇ ′ is changed under the condition that ⁇ P and ⁇ R are constant and the tapered contact is established. Show. That is, FIG. 4 satisfies all the first to third conditions of the present embodiment including ⁇ ⁇ .
- FIG. 6 when ⁇ ′ is too small, the second condition described above is not satisfied, and the ball 7 comes into contact with the tapered surface 9 b of the cage 11.
- the minimum inner diameter ⁇ d of the retainer 11 is smaller than the maximum shoulder outer diameter ⁇ D of the inner ring 5, and Assembling of the cage 11 from the shoulder side becomes impossible.
- the pocket 9 of the cage 11 has the straight surface 9a and the tapered surface 9b with which the ball 7 comes into surface contact.
- the connection point 9c between the straight surface 9a and the tapered surface 9b is formed on the inner diameter side of the intersection I between the extension surface F of the rolling element equatorial surface and the wall surface of the pocket 9, and the center of the plurality of balls 7
- the distance ⁇ P between the ball 7 and the wall surface of the pocket 9 on the extended surface F of the rolling body equatorial plane is the shortest distance between the tapered surface 9b and the ball 7 in the direction perpendicular to the straight line L.
- the angle ⁇ formed between the line a connecting the contact point P 1 and the center O of the ball 7 and the extended surface F of the rolling body equatorial plane is the difference between the shoulder outer maximum diameter of the inner ring 5 and the contour of the ball 7. and a line b connecting the center O of intersection P 2 and ball 7, less than the angle ⁇ between the extension surface F of the rolling element equatorial plane.
- FIG.8 (a) is sectional drawing of the deep groove ball bearing provided with the cage for rolling bearings concerning 2nd Embodiment of this invention
- FIG.8 (b) is the figure which looked at the ball and the cage from radial direction. It is.
- the axial thickness of the annular portion 15 is increased to increase the rigidity of the annular portion 15.
- the center position L1 of the ball 7 is offset from the center position L2 of the outer ring 3 and the inner ring 5 to the opposite side to the annular portion 15.
- the part 15 can be made as thick as possible in the axial direction.
- Other configurations and operations are the same as those in the first embodiment.
- FIG. 9 is a cross-sectional view of a deep groove ball bearing including a rolling bearing cage according to the third embodiment of the present invention.
- the shape of the inner diameter side of the crown-shaped cage 11 is different from that of the first embodiment, and the inner diameter ⁇ db of the distal end portion is increased so that the thickness of the distal end portion of the column portion 17 is reduced. .
- the inclined surface 19 a of the inner diameter side convex portion 19 is longer than the inclined surface 19 a on the annular portion side and is continuously formed up to the column portion 17.
- the crown type cage 11 of the present embodiment is configured such that at least one of the shoulder portion maximum outer diameters ⁇ D of the inner ring 5 ⁇ the minimum inner diameter ⁇ d of the cage 11 and the annular portion side cage inner diameter ⁇ da ⁇ the cage 11. Is formed so as to satisfy both of the relations of the inner diameter ⁇ db of the tip portion.
- ⁇ D ⁇ d is a condition for establishing the assembly as described above.
- ⁇ da ⁇ db is a condition for improving the assemblability in inserting the ball 7 into the cage 11 while maintaining the rigidity of the annular portion 15.
- Other configurations and operations are the same as those in the first embodiment. Also in this embodiment, as shown in FIG. 10, the axial thickness of the annular portion 15 may be increased as in the second embodiment.
- the contour shape of the pocket surface of the crown-shaped cage 11 is not limited to that of the present embodiment as long as it has a straight surface and a tapered surface, and can be arbitrarily formed.
- the crown-shaped cage 11 may have a rectangular-shaped inner diameter side convex portion 19, and as shown in FIG. You may have the internal diameter side convex part 19.
- FIG. 11 (a) the crown-shaped cage 11 may have a rectangular-shaped inner diameter side convex portion 19, and as shown in FIG. You may have the internal diameter side convex part 19.
- retainer 11 may have the curvilinear inner diameter side convex part 19, or as shown in FIG.11 (d), a crown type holder
- the axial position of the inner diameter side convex portion 19 is the center position of the ball 7 in the axial direction so that the tapered surface 9b can hold the ball 7. It is preferable to overlap with L1.
- the tip portion 19c of the ball 7 is formed. It is preferable to overlap with the center position L1.
- the tip end portion of the pillar portion 17 of the crown-shaped cage 11 may be configured to have a claw portion 21, and in this case as well, FIG. ),
- the axial thickness of the annular portion 15 may be increased.
- the inner diameter of the annular portion 15 is the same as that of the claw portion 21 as in the third embodiment. By making it smaller than the inner diameter, the rigidity of the annular portion 15 can be ensured and the assemblability of the balls 7 can be improved.
- the rolling bearing of the present invention may be suitably used to support the main shaft in a main shaft device such as a machine tool, or may be applied to support the motor shaft of a high-speed motor. .
- the rolling bearing of the present invention is not limited to the deep groove ball bearing of the present embodiment, but may be another type of rolling bearing such as an angular ball bearing or a cylindrical roller bearing. Therefore, the rolling elements are not limited to balls.
- the rolling bearing retainer is not limited to the crown retainer of the present embodiment as long as it is a rolling element guide system, and may be, for example, a shape having annular portions at both axial end portions.
- the minimum inner diameter of the shoulder portion of the inner ring of the present invention refers to the inner diameter of the lower shoulder portion on both sides in the axial direction of the raceway surface, for example, in an angular ball bearing.
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Abstract
Description
(1) 円周方向に所定の間隔で設けられ、複数の転動体をそれぞれ保持する複数のポケットを有する転動体案内方式の転がり軸受用保持器であって、
前記保持器のポケットは、前記転動体の公転軸と、前記保持器の自転軸とを一致させた中立位置において、前記転動体の中心と前記自転軸とを結ぶ直線に平行なストレート面と、該ストレート面の内径側で前記ストレート面と接続し、前記ストレート面から径方向に離れるに従って前記直線に向かって延びるテーパ面と、を有し、
前記テーパ面は、前記転動体と前記保持器とが前記直線に沿って相対的に移動したときに前記転動体と面接触するように形成され、
前記ストレート面と前記テーパ面との接続点は、前記転動体の中心を通り、前記直線に対して垂直となる転動体赤道面の延長面と前記ポケットの壁面との交差部よりも内径側に形成され、
前記複数の転動体の中心を通る2次元断面において、前記中立位置では、前記転動体赤道面の延長面における前記転動体と前記ポケットの壁面との距離は、前記直線に垂直な方向における前記テーパ面と前記転動体との最短距離よりも小さく、
前記複数の転動体の中心を通る2次元断面において、前記転動体と前記保持器とを前記直線に沿って相対的に移動させ、前記テーパ面と前記転動体とを接触させた際に形成される接触点と前記転動体の中心とを結ぶ線と、前記転動体赤道面の延長面との間のなす角度は、前記内輪の肩部最大外径と前記転動体の輪郭との交点と前記転動体の中心とを結ぶ線と、前記転動体赤道面の延長面との間のなす角度よりも小さいことを特徴とする転がり軸受用保持器。
(2) 前記保持器の軸方向中間部には、内径側に突出する内径側凸部を有し、前記内径側凸部の最小内径は、前記内輪の各肩部最大外径の少なくとも一方より大きいことを特徴とする(1)に記載の転がり軸受用保持器。
(3) 前記保持器は、円環部と、該円環部から軸方向に延出する複数の柱部と、を有する冠型保持器であることを特徴とする(1)または(2)に記載の転がり軸受用保持器。
(4) 前記転がり軸受の軸方向において、前記転動体の中心位置は、前記円環部から離間するように、前記内輪及び外輪の中心位置からオフセットすることを特徴とする請求項3に記載の転がり軸受用保持器。
(5) 前記円環部の内径は、前記柱部の先端部の内径よりも小さいことを特徴とする請求項3または4に記載の転がり軸受用保持器。
(6) 前記保持器は、合成樹脂からなることを特徴とする請求項1~5の何れか1項に記載の転がり軸受用保持器。
(7) 前記転動体は、玉であることを特徴とする請求項1~6の何れか1項に記載の転がり軸受用保持器。
(8) 請求項1~7の何れか1項に記載の転がり軸受用保持器を有することを特徴とする転がり軸受。
先ず、本発明の第1実施形態に係る冠型保持器11を有する深溝玉軸受1について説明する。図1に示すように、深溝玉軸受1は、内周面に外輪軌道面3aを有する外輪3と、外周面に内輪軌道面5aを有する内輪5と、外輪軌道面3aと内輪軌道面5aとの間に転動自在に配設された複数の玉7と、玉7をポケット9内に転動自在に保持して外輪3と内輪5との間に配置された冠型保持器11と、を有する。また、深溝玉軸受1の内部空間には、潤滑剤としてのグリースが封入されている。なお、潤滑剤としては、オイルであってもよい。
一方、図5(b)に示す従来の冠型保持器では、テーパ面9bと玉7とがエッジ当たりしていることから、冠型保持器11の変形前後において、テーパ面9bと玉7との接触点が移動する(上記角度αが変わってしまう)。したがって、従来の冠型保持器では、保持器の半径方向変化量が保持器11のラジアル方向増加量となる。
なお、ΔTは、保持器のラジアル動き量ΔRと、角度αとの関係で与えられる(ΔT=ΔR×tanα)。
図8(a)は、本発明の第2実施形態に係る転がり軸受用保持器を備える深溝玉軸受の断面図であり、図8(b)は、玉と保持器を半径方向から見た図である。
本実施形態では、円環部15の軸方向厚さを増加させ、円環部15の剛性の増大を図っている。これにより、遠心力によるポケット周方向長さの増大を抑制し、ポケット隙間および保持器ラジアル動き量の増大の抑制が可能となる。このため、本実施形態では、深溝玉軸受1の軸方向において、玉7の中心位置L1を、外輪3及び内輪5の中心位置L2から円環部15と反対側にオフセットすることで、円環部15を軸方向に可能な限り厚くすることができる。
なお、その他の構成及び作用については、第1実施形態のものと同様である。
図9は、本発明の第3実施形態に係る転がり軸受用保持器を備える深溝玉軸受の断面図である。
本実施形態では、冠型保持器11の内径側の形状が第1実施形態のものと異なり、柱部17の先端部の肉厚が薄くなるように、先端部の内径φdbを大きくしている。このため、柱部17の先端部側では、内径側凸部19の傾斜面19aが円環部側の傾斜面19aよりも長く、柱部17まで連続して形成されている。
これにより、本実施形態の冠型保持器11は、内輪5の各肩部最大外径φDの少なくとも一方<保持器11の最小内径φd、及び、円環部側保持器内径φda<保持器11の先端部の内径φdbの関係の両方を満たすように形成される。
その他の構成及び作用については、第1実施形態のものと同様である。
なお、本実施形態においても、図10に示すように、第2実施形態と同様、円環部15の軸方向肉厚を厚くしてもよい。
例えば、冠型保持器11のポケット面の輪郭形状は、ストレート面とテーパ面を有するものであれば、本実施形態のものに限らず、任意に形成可能である。具体的に、図11(a)に示すように、冠型保持器11は、矩形形状の内径側凸部19を有してもよく、図11(b)に示すように、アリ溝形状の内径側凸部19を有してもよい。また、図11(c)に示すように、冠型保持器11は、曲線形状の内径側凸部19を有してもよく、或いは、図11(d)に示すように、冠型保持器11は、内径側凸部19を有しない形状であってもよい。
また、図13(a)及び(b)に示すように、柱部の先端部に爪部21を有する場合も、第3実施形態のように、円環部15の内径は、爪部21の内径よりも小さくすることで、円環部15の剛性を確保でき、且つ、玉7の組付け性を向上できる。
また、転がり軸受用保持器は、転動体案内方式であれば、本実施形態の冠型保持器に限定されず、例えば、軸方向両端部に円環部を有する形状であってもよい。
さらに、本発明の内輪の肩部最小内径とは、例えば、アンギュラ玉軸受などにおいては、軌道面の軸方向両側において、高さが低い側の肩部の内径を指す。
3 外輪
5 内輪
7 玉(転動体)
9 ポケット
9a ストレート面
9b テーパ面
9c 接続点
11 冠型保持器(転がり軸受用保持器)
19 内径側凸部
F 転動体赤道面の延長面
ΔP 転動体とポケットの壁面との距離
ΔT テーパ面9bと玉7との最短距離
Claims (8)
- 円周方向に所定の間隔で設けられ、複数の転動体をそれぞれ保持する複数のポケットを有する転動体案内方式の転がり軸受用保持器であって、
前記保持器のポケットは、前記転動体の公転軸と、前記保持器の自転軸とを一致させた中立位置において、前記転動体の中心と前記自転軸とを結ぶ直線に平行なストレート面と、該ストレート面の内径側で前記ストレート面と接続し、前記ストレート面から径方向に離れるに従って前記直線に向かって延びるテーパ面と、を有し、
前記テーパ面は、前記転動体と前記保持器とが前記直線に沿って相対的に移動したときに前記転動体と面接触するように形成され、
前記ストレート面と前記テーパ面との接続点は、前記転動体の中心を通り、前記直線に対して垂直となる転動体赤道面の延長面と前記ポケットの壁面との交差部よりも内径側に形成され、
前記複数の転動体の中心を通る2次元断面において、前記中立位置では、前記転動体赤道面の延長面における前記転動体と前記ポケットの壁面との距離は、前記直線に垂直な方向における前記テーパ面と前記転動体との最短距離よりも小さく、
前記複数の転動体の中心を通る2次元断面において、前記転動体と前記保持器とを前記直線に沿って相対的に移動させ、前記テーパ面と前記転動体とを接触させた際に形成される接触点と前記転動体の中心とを結ぶ線と、前記転動体赤道面の延長面との間のなす角度は、前記内輪の肩部最大外径と前記転動体の輪郭との交点と前記転動体の中心とを結ぶ線と、前記転動体赤道面の延長面との間のなす角度よりも小さいことを特徴とする転がり軸受用保持器。 - 前記保持器の軸方向中間部には、内径側に突出する内径側凸部を有し、前記内径側凸部の最小内径は、前記内輪の各肩部最大外径の少なくとも一方より大きいことを特徴とする請求項1に記載の転がり軸受用保持器。
- 前記保持器は、円環部と、該円環部から軸方向に延出する複数の柱部と、を有する冠型保持器であることを特徴とする請求項1または2に記載の転がり軸受用保持器。
- 前記転がり軸受の軸方向において、前記転動体の中心位置は、前記円環部から離間するように、前記内輪及び外輪の中心位置からオフセットすることを特徴とする請求項3に記載の転がり軸受用保持器。
- 前記円環部の内径は、前記柱部の先端部の内径よりも小さいことを特徴とする請求項3または4に記載の転がり軸受用保持器。
- 前記保持器は、合成樹脂からなることを特徴とする請求項1~5の何れか1項に記載の転がり軸受用保持器。
- 前記転動体は、玉であることを特徴とする請求項1~6の何れか1項に記載の転がり軸受用保持器。
- 請求項1~7の何れか1項に記載の転がり軸受用保持器を有することを特徴とする転がり軸受。
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| US16/461,174 US20190368540A1 (en) | 2016-11-16 | 2017-11-13 | Rolling bearing cage and rolling bearing |
| JP2018551608A JP6922928B2 (ja) | 2016-11-16 | 2017-11-13 | 転がり軸受用保持器、及び転がり軸受 |
| CN201780071021.4A CN109964055A (zh) | 2016-11-16 | 2017-11-13 | 滚动轴承用保持架以及滚动轴承 |
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| FR3098264A1 (fr) * | 2019-07-03 | 2021-01-08 | Ntn-Snr Roulements | cage de roulement, assemblage associÉ et procédés de montAge et de démontage associÉs |
| CN113614398A (zh) * | 2019-03-22 | 2021-11-05 | Ntn株式会社 | 深沟球轴承 |
| US11286987B2 (en) | 2019-07-03 | 2022-03-29 | Ntn-Snr Roulements | Bearing cage, associated assembly and associated mounting and dismantling methods |
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| CN112240347B (zh) * | 2019-07-17 | 2024-10-15 | 斯凯孚公司 | 轴承保持架及其应用 |
| TWI707094B (zh) * | 2019-09-12 | 2020-10-11 | 台灣添佶軸承科技有限公司 | 角接觸軸承保持架 |
| CN111022486B (zh) * | 2019-12-16 | 2021-11-26 | 中国航发哈尔滨轴承有限公司 | 一种不易散套且可灵活拆卸的双半内圈角接触球轴承 |
| CN111765171A (zh) * | 2020-07-16 | 2020-10-13 | 河南科技大学 | 一种圆柱滚子轴承及其保持架 |
| JP2022024610A (ja) * | 2020-07-28 | 2022-02-09 | Ntn株式会社 | アンギュラ玉軸受 |
| CN111894986B (zh) * | 2020-07-31 | 2021-11-09 | 中车大连机车研究所有限公司 | 一种偏心圆弧结构的滚动轴承保持架和深沟球轴承 |
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| US11286987B2 (en) | 2019-07-03 | 2022-03-29 | Ntn-Snr Roulements | Bearing cage, associated assembly and associated mounting and dismantling methods |
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| Publication number | Publication date |
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| US20190368540A1 (en) | 2019-12-05 |
| TW201819790A (zh) | 2018-06-01 |
| JP6922928B2 (ja) | 2021-08-18 |
| KR20190062571A (ko) | 2019-06-05 |
| CN109964055A (zh) | 2019-07-02 |
| EP3543553B1 (en) | 2020-12-30 |
| EP3543553A1 (en) | 2019-09-25 |
| EP3543553A4 (en) | 2019-10-09 |
| JPWO2018092707A1 (ja) | 2019-10-17 |
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