KR101826197B1 - Cage for ball bearing - Google Patents

Cage for ball bearing Download PDF

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Publication number
KR101826197B1
KR101826197B1 KR1020160030329A KR20160030329A KR101826197B1 KR 101826197 B1 KR101826197 B1 KR 101826197B1 KR 1020160030329 A KR1020160030329 A KR 1020160030329A KR 20160030329 A KR20160030329 A KR 20160030329A KR 101826197 B1 KR101826197 B1 KR 101826197B1
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KR
South Korea
Prior art keywords
partition wall
ball rolling
dividing line
cage
lower partition
Prior art date
Application number
KR1020160030329A
Other languages
Korean (ko)
Other versions
KR20170106779A (en
Inventor
현준수
이운주
정진호
박상묵
Original Assignee
주식회사 베어링아트
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
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Application filed by 주식회사 베어링아트 filed Critical 주식회사 베어링아트
Priority to KR1020160030329A priority Critical patent/KR101826197B1/en
Publication of KR20170106779A publication Critical patent/KR20170106779A/en
Application granted granted Critical
Publication of KR101826197B1 publication Critical patent/KR101826197B1/en

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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
    • F16C33/3812—Ball cages formed of interconnected segments, e.g. chains
    • 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
    • F16C33/32—Balls
    • 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
    • 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
    • F16C2220/00—Shaping
    • F16C2220/02—Shaping by casting
    • F16C2220/04—Shaping by casting by injection-moulding

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ball bearing cage, and more particularly, to a ball bearing cage which includes a plurality of partition walls which are formed to protrude in the axial direction and are spaced apart from each other by a predetermined distance in the circumferential direction and a plurality of support legs Bearing cage. Wherein the barrier ribs are formed on an outer side of a radial direction with respect to a predetermined dividing line; And a lower partition wall formed radially inward of the dividing line, wherein a pair of seating vanes protruding axially to support the ball rolling body is formed on the lower partition wall, It is possible to prevent cracks or breakage caused in the seat wing when it is separated.

Description

Ball Bearing Cage {CAGE FOR BALL BEARING}

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a ball bearing cage, and more particularly, to a ball bearing cage in which breakage thereof is minimized when manufactured by an injection mold.

In general, a bearing is a mechanical element mounted between a rotating element and a non-rotating element to facilitate rotation of the rotating element while supporting the axis of the rotating element.

These bearings are divided into sliding bearings and rolling bearings depending on the state of contact with the shaft, and can be classified into a radial bearing and a thrust bearing according to the direction in which the load is applied.

The rolling bearing has a structure in which a rotating shaft is supported by a rolling body such as a ball or a roller and has a merit that the frictional resistance is smaller than that of a sliding bearing which directly contacts a part of the shaft. Rolling bearings are classified into ball bearings, tapered roller bearings, and needle bearings according to the shape of the rolling elements, and the utilization of the rolling bearings is improved due to the above structural advantages .

 On the other hand, a ball bearing, which is a kind of rolling bearing, is formed in a generally spherical shape of a rolling member, and the contact area with the rotating shaft is relatively small, so that the ball bearing rotates at a high speed effectively. These ball bearings are classified into deep groove ball bearings and angular ball bearings that support the drive shaft rotating at high speed by forming a raceway surface having a constant contact angle with the inner and outer rings, do.

The deep groove ball bearings are the most common type of rolling bearings, and have a cylindrical inner ring, an outer ring spaced radially outward from the inner ring, a plurality of rolling members provided in the grooves of the arcs formed on the inner and outer rings, And a cage which fixes the plurality of rolling elements so as to be held at predetermined intervals along the circumferential direction.

The upper cage is generally in the form of a ring, and the seat blades accommodating the rolling elements are spaced apart in the circumferential direction. The seat blade is formed in an obtuse-arcuate shape so that the rolling elements are not displaced in the axial direction.

As shown in Fig. 7, the cage 300 is injection-molded by the mold 350. As shown in Fig. That is, the molten resin is injected into the mold 350 to cure the mold 350 into the shape of the cage 300, and the mold 350 is separated from the cage 300. The mold 350 is formed with a protrusion 360 whose cross section is generally circular in shape corresponding to the rolling member. The molten resin is filled along the outer circumferential surface of the protrusion 360, . The seat wing 310 is formed in an arc shape having a central angle of an obtuse angle, thereby restricting the movement of the rolling elements accommodated in the seat.

Since the upper seating wing 310 is formed to surround the protrusion 360 of the mold 350, in the process step of demolding the upper mold 350 in the direction indicated by the arrow, (360). As a result, cracks may occur on the side of the seat wing 310 where stress is concentrated, or the material may be damaged.

Particularly, when a thin ball bearing requiring high-speed rotation is manufactured, since the width of the cage 300 is small, breakage of the seat wing 310 may frequently occur. Failure of the seat blade 310 deteriorates the function of the cage 300, which may result in the rolling elements not supporting the rotary shaft properly, and may deteriorate the performance of the entire ball bearing.

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a ball-and-bay cage having a seat wing that is not damaged by a metal mold in its manufacturing stage.

In order to accomplish the above object, a ball bearing cage according to an embodiment of the present invention includes a plurality of partition walls protruding in the axial direction and spaced at a predetermined distance in the circumferential direction, and a plurality of And may include a support leg.

Wherein the barrier ribs are formed on an outer side of a radial direction with respect to a predetermined dividing line; And a lower partition wall formed radially inward with respect to the dividing line, wherein the lower partition wall is formed with a pair of seating vanes protruding axially to support the ball rolling body.

And the support legs are disposed between the upper partition walls facing each other.

Wherein each of the side surfaces of the upper partition wall facing each other, the front surface of the support leg, and the inner surface of the seat vane are formed as curved surfaces facing the center of the ball rolling element to receive the ball rolling element have.

And the upper partition wall may have a wider circumferential width toward a radially outer side.

And corners protruding radially outwardly are formed at both side ends of the upper partition to support the ball rolling body.

And both side surfaces of the lower partition wall are not in contact with the ball rolling element.

Both side surfaces of the lower partition wall are formed in a rectangular plane so as to facilitate the injection process of the metal mold.

And an empty space is formed between the circumferential direction of the lower partition wall facing each other to emit heat generated from the ball rolling element.

And the seat blade is formed in a shape that its thickness becomes narrower in the axial direction.

And the dividing line may be located radially inward of the center of the ball rolling member.

And the dividing line is set to pass through the center of the ball rolling member.

According to an embodiment of the present invention, there is provided a deep groove ball bearing comprising: a cylindrical inner ring; an outer ring spaced radially outwardly from the inner ring; a plurality of ball rolling members installed in grooves of an arc formed in the inner ring and the outer ring; And a ball bearing cage provided to maintain the ball rolling element at a predetermined interval in a circumferential direction, wherein the ball bearing cage is formed to protrude in an axial direction and is spaced apart from the ball bearing cage by a predetermined distance in the circumferential direction; And a plurality of support legs connecting the plurality of partitions, wherein the partition walls are formed on an outer side of a radial outer side with respect to a predetermined dividing line; And a lower partition wall formed radially inward with respect to the dividing line, wherein a pair of seating vanes protruding in the axial direction to support the ball rolling body is formed on the lower partition wall.

The ball bearing cage may be formed of a plastic material by a die process.

As described above, according to the embodiment of the present invention, when the cage is separated from the mold, it is possible to prevent cracks or breakage generated in the seat blade. Therefore, the rolling elements interposed between the inner ring and the outer ring are stably received in the cage, while the cage can be prevented from being dislodged from the ball bearing due to the breakage.

1 is a front perspective view of a cage according to an embodiment of the present invention.
2 is an enlarged view of a portion A in Fig.
3 is an inner perspective view showing a state in which a rolling element is housed in a cage according to an embodiment of the present invention.
4 is an external perspective view showing a state in which a rolling element is housed in a cage according to an embodiment of the present invention.
5 is an inner perspective view showing a cage injection process according to an embodiment of the present invention.
6 is an outer perspective view showing an injection process of the cage according to the embodiment of the present invention.
7 is a schematic view showing a cage injection process according to the prior art.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

Throughout the specification, when an element is referred to as "comprising ", it means that it can include other elements as well, without excluding other elements unless specifically stated otherwise.

For convenience of explanation, the left side of the drawing is referred to as 'one side', 'one side', 'one side', and the like name, and the right side of the drawing is referred to as 'other side', 'other side' Quot;

The parts denoted by the same reference numerals throughout the specification mean the same or similar components.

FIG. 1 is a front perspective view of a cage according to an embodiment of the present invention, and FIG. 2 is an enlarged view of a portion A of FIG.

The cage 10 according to an embodiment of the present invention is generally formed in a circular ring shape. The direction perpendicular to the plane on which the cage 10 is placed is defined as "axial direction ", and the portion near the radial outside of the cage 10 is defined as" And a portion near the inside of the radius of the cage 10 is defined as "lower side ".

The cage 10 includes a plurality of columnar partition walls 20 protruding in the axial direction and a support leg 30 connecting between the adjacent partition walls 20.

As shown in FIG. 2, the plurality of barrier ribs 20 include an upper barrier rib 21 formed outside the radius on the basis of the dividing line P, which is an arbitrary virtual line, and an upper barrier rib 21 formed inside the radius of the upper barrier rib 21 And a lower partition 23. The upper barrier ribs 21 may be formed in a column shape having an upper light-narrowing width that becomes wider in the circumferential direction toward the outside of the radius, and the lower barrier ribs 23 may be formed in a rectangular column shape. Both side surfaces 121 of the upper partition 21 may be formed as curved surfaces having a constant curvature and both sides 123 of the lower partition 23 may be formed as a rectangular surface.

Due to the structure of the partition 20 as described above, the rolling members are inserted between the both sides 123 of the lower partition 23, and the inserted rolling members are fixed between the upper partition 21 and deviated radially outward . Particularly, since both side surfaces 123 of the lower partition 23 are formed in a flat surface, it is possible to demold the mold easily during injection molding.

On both side portions in the circumferential direction of the lower partition wall 23 facing each other, a pair of seating vanes 50 protruding in the axial direction are formed. One of the pair of seating wings 50 formed on the lower partition 23 and one of the seating wings 50 of the adjacent lower partition 23 are formed in a curved shape facing each other. More specifically, the upper seating blade 50 is formed so as to project further forward from the side front surface of the lower partition wall 23, and the inner side surface 51 thereof is formed to be curved so as to correspond to the outer surface of the spherical rolling element .

The inner side surface 51 may naturally extend axially from both side surfaces 123 of the lower partition wall 23 and the upper seating blade 50 may be formed to have a shape becoming narrower in the axial direction. That is, the width d1 of the portion where the seat wing 50 starts is larger than the width d2 of the end portion of the seat wing 50. Accordingly, when the mold is removed in the step of injecting the seat vane 50, it is possible to suppress the generation of cracks in the portion where the seat vane 50 starts due to the interference between the upper mold and the seat vane 50 have.

The support legs 30 connect between the adjacent upper partition walls 21 and the front surface 31 is formed in a concave shape radially inward. Thus, the support legs 30 are formed only between the upper partition walls 21, thereby reducing the cost of the cage 10 and reducing the total weight. An empty space (S) is formed between the lower partition walls (23). Due to the empty space S, heat generated in the rolling member rotating at a high speed can be easily diverged.

The seat blades 50 formed on the upper lower partition wall 23 and the front surface 31 of the support leg 30 define ball pockets 60 for accommodating the rolling elements. The state in which the rolling body is mounted on the ball pocket 60 will be described in more detail with reference to Figs. 3 to 4. Fig.

3 is an enlarged view of a radially inner portion of the cage 10 in a state where the ball rolling member 70 is housed in the cage 10. Figure 4 is a cross sectional view of the ball rolling member 70, Fig. 8 is an enlarged view of a radially outer portion of the cage 10 in the state of Fig.

The ball rolling body 70 is inserted from the inside of the radius of the cage 10 to be seated in the ball pocket 60 and the radially inner portion of the ball rolling body 70 is fitted to the seating blade 50 formed in the lower partition 23 So that movement in the radial and circumferential directions is limited. At this time, the ball rolling body 70 contacts the inner side surface 51 of the seating blade 50 having a curved surface, but does not contact the both side surfaces 123 of the lower partition wall 23.

4, the radially outer portion of the ball rolling body 70 is supported by the support leg 30 at the rear side thereof. Edges 27 are formed at both ends of the upper partition wall 21 so that the ball rolling member 70 is brought into contact with the edge 27 and is restricted from moving in the radial direction and the circumferential direction.

FIG. 5 is an inner perspective view illustrating an injection process of a cage according to an embodiment of the present invention, and FIG. 6 is an outer perspective view illustrating an injection process of a cage according to an embodiment of the present invention.

Figs. 5 and 6 illustrate radially inner and radially outer portions when the cage 10 is injection molded. The cage 10 according to the embodiment of the present invention is injection-molded by a mold 80. [ That is, the molten resin is injected into the inside of the mold 80 to be hardened into the shape of the cage 10, and the mold 80 is separated again from the cage 10 formed by solidification.

According to the prior art, the seating blade extends in the radial direction with a width equal to the radial width of the partition wall 20, while the support leg connecting the partition walls 20 has the same width as the radial thickness of the partition wall 20 In the circumferential direction. The cage 10 having such a structure has a problem in that its weight is increased and the heat generated from the ball rolling member 70 can not be effectively discharged. Further, when the mold 80 is separated from the cage 10 in the process of injection molding the cage 10, the width of the upper seating wing is formed to be equal to the width of the partition wall 20, The molds 80 interfere with each other. Therefore, cracks or breakage may occur in the seat blade.

However, according to the embodiment of the present invention, the partition wall 20 is separated into the upper partition wall 21 and the lower partition wall 23 with respect to the dividing line P, and the seating vane 50 is separated from the partition line P And is formed in a shape protruding in the axial direction from both side portions of the lower partition wall 23 formed inside the radius. As such, the upper dividing line P can be regarded as a reference line with respect to the radial extension length (width) of the seating blade 50. That is, along the upper dividing line P, the width of the seating blade 50 is determined.

Therefore, when the upper mold 80 is separated from the seat vane 50, the contact area of the seat vane 50, which interferes with the metal mold 80, becomes smaller and the stress becomes smaller. Therefore, at the time of injection molding of the cage 10, breakage of the seat blades 50 can be remarkably reduced.

At this time, the upper dividing line P can be set so as to pass through the center O of the ball rolling member 70. If the dividing line P is set so as to pass radially outward beyond the center O of the ball rolling member 70, the width occupied by the stowing blade 50 in the injection molding process of the cage 10 becomes large There is a risk of being damaged. On the other hand, if the dividing line P is set to be radially inward of the center O of the ball rolling member 70, the width of the seating blade 50 becomes small and the ball rolling member 70 can not be properly supported , The rigidity thereof can not be maintained. Therefore, it is appropriate to set the upper dividing line P so as to have the optimum width in a state of maintaining the rigidity of the seating vane 50. [ For this purpose, the upper dividing line P can be set so as to pass through the center O of the ball rolling member 70. However, the present invention is not limited to this, and the upper dividing line P may be set to be radially inward or outward beyond the upper center O in the extent that the stiffness of the seat wing 50 is maintained.

Further, both side surfaces 123 of the lower partition wall 23 are formed in a rectangular plane, so that the metal mold 80 does not interfere with injection, thereby enabling more advantageous injection molding.

As described above, the upper partition wall 21 is connected by the support leg 30, and the void space S is formed between the lower partition walls 21. Accordingly, the cost and weight of the cage 10 can be reduced, and a structure advantageous to heat radiation can be provided.

An essential function of the upper seating blade 50 is to support the ball rolling body 70. Even if the seating blade 50 is formed only on the lower partition wall 23 as described above, It is possible to effectively support the ball rolling member 70 by the front face 31 of the support leg 30.

The cage 10 having such a structure can be applied to a deep groove ball bearing. That is, although not shown in the drawings, a deep groove (not shown) including a cylindrical inner ring, an outer ring spaced apart from the inner ring by a predetermined distance from the inner ring, and a plurality of ball rolling members 70 provided in the groove of an arc formed in the inner ring and the outer ring In the groove ball bearing, the upper cage 10 may be provided so as to keep the ball rolling member 70 at a predetermined interval along the circumferential direction. By providing the cage 10 with improved durability in the injection process, it is possible to drive the groove ball bearing in a more stable manner, while the cage 10 ) Can be applied to improve the function of the deep groove ball bearing.

However, the cage 10 according to the embodiment of the present invention is applicable not only to the deep groove ball bearing but also to various bearings.

While the present invention has been described in connection with what is presently considered to be practical exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, And all changes to the scope that are deemed to be valid.

Claims (15)

A ring-shaped ball bearing cage protruding in the axial direction and having a plurality of partition walls spaced at a predetermined distance in the circumferential direction, and a plurality of support legs connecting the plurality of partition walls,
The partition wall
An upper partition wall formed outside the radius based on the set dividing line; And
A lower partition wall formed radially inward of the dividing line;
/ RTI >
A pair of seat blades protruding in the axial direction to support the ball rolling body is formed on the lower partition wall,
Wherein the support legs form an empty space between the lower partition walls, connect the upper partition walls to each other, and support the ball rolling bodies together with the pair of seat wings.
delete The method according to claim 1,
Wherein each of the side surfaces of the upper partition wall facing each other, the front surface of the support leg, and the inner surface of the seat blade are formed as curved surfaces facing the center of the ball rolling element to receive the ball rolling element. Bearing cage.
The method according to claim 1,
And the upper partition wall has a larger circumferential width toward the outside of the radius.
The method according to claim 1,
And a corner protruding outward in the radial direction is formed at both side ends of the upper partition to support the ball rolling body.
The method according to claim 1,
And both side surfaces of the lower partition wall are not in contact with the ball rolling body.
The method according to claim 1,
Wherein both side surfaces of the lower partition wall are formed in a rectangular plane so as to facilitate a mold injection process.
The method according to claim 1,
And heat generated from the ball rolling member is discharged through the empty space.
The method according to claim 1,
Wherein the seating blade is formed in a shape that its thickness becomes narrower in the axial direction.
The method according to claim 1,
Wherein the dividing line is located radially outward of the center of the ball rolling member.
The method according to claim 1,
Wherein the dividing line is set to pass through the center of the ball rolling member.
A ring-shaped ball bearing cage protruding in the axial direction and having a plurality of partition walls spaced at a predetermined distance in the circumferential direction, and a plurality of support legs connecting the plurality of partition walls,
The partition wall
An upper partition wall formed outside the radius based on the set dividing line; And
A lower partition wall formed radially inward of the dividing line;
/ RTI >
A pair of seat blades protruding in the axial direction to support the ball rolling body is formed on the lower partition wall,
The support leg is disposed between the upper partition walls facing each other and supports the ball rolling element together with the pair of seat wings,
And both side surfaces of the lower partition wall are not in contact with the ball rolling body. delete delete delete
KR1020160030329A 2016-03-14 2016-03-14 Cage for ball bearing KR101826197B1 (en)

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Application Number Priority Date Filing Date Title
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KR101826197B1 true KR101826197B1 (en) 2018-02-06

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Publication number Priority date Publication date Assignee Title
KR102457930B1 (en) * 2022-04-11 2022-10-24 위아코퍼레이션 주식회사 Bearing retainer

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2013142424A (en) * 2012-01-10 2013-07-22 Jtekt Corp Resin retainer

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2013142424A (en) * 2012-01-10 2013-07-22 Jtekt Corp Resin retainer

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