KR20220166441A - Retainer member, bearing retainer and rolling-element bearing having the same - Google Patents

Abstract

Disclosed are a retainer member, a bearing retainer and a rolling-element bearing having the same, wherein a rolling-element bearing capable of supporting a member rotating at high speed to be able to rotate can be assembled. The retainer member according to an aspect of the present invention, which is a ring-shaped retainer member forming a circular space configured to pass a shaft member extending in an axial direction, may comprise: a plurality of insertion parts having a groove formed in a shape corresponding to part of a rolling element on one side to define part of an accommodation space for accommodating the rolling element and arranged at designed intervals; a plurality of first combination parts including a flat surface on one side and arranged at designed intervals; and combination protrusions protruding from one side of the first combination parts in the axial direction. The combination protrusions may include: a circular protrusion head; and a protrusion neck extending between the protrusion head and the first combination part. A distance from the center of the circular shape of the protrusion head to the first combination part can correspond to half the width of the first combination part.

Description

Retainer member, bearing retainer and rotating bearing having the same {RETAINER MEMBER, BEARING RETAINER AND ROLLING-ELEMENT BEARING HAVING THE SAME}

The present invention relates to a rotary bearing, and more specifically, to a retainer member for assembling a rotary bearing capable of rotatably supporting a member rotating at high speed, a bearing retainer, and a rotary bearing having the same.

Bearing refers to a structure for supporting moving members of a mechanical device with respect to each other and transmitting driving force in the right direction with minimal loss. Bearings can be used, for example, to minimize friction, applied where a rotating shaft is supported by another non-rotating member.

Bearings used to support a rotating shaft include sliding bearings and rotary bearings. Sliding bearings rely only on materials with low frictional force, and the rotating shaft is placed inside a member that does not cause large frictional force, such as a metal sleeve. is supported on Here, the shaft and the bearing have a limit in reducing the frictional force by contacting over the entire area of the outer circumferential surface of the shaft. Therefore, when the shaft requires high-speed rotation or high durability, a rotating bearing that can further reduce the frictional force is used. .

In the rotary bearing, a rotating body such as a ball or roller is disposed between the outer ring and the inner ring, but a retainer is provided between the outer ring and the inner ring to maintain a predetermined distance between the rotating bodies. The retainer according to the prior art is composed of one retainer member, and spaces in which the rotating body is accommodated are open in one direction along the axial direction, and the rotating body is inserted into the retainer member through the open portion when installing the bearing.

On the other hand, since the rotary bearing is related to a shaft member that rotates around a rotational axis, force is applied mainly in the rotational and radial directions, but also to some extent in the axial direction. That is, apart from the case where an external force is applied to the shaft or bearing in the axial direction, when the shaft rotates at high speed and the rotating bodies rotate together at high speed, deformation of parts due to centrifugal force, manufacturing tolerance of parts, etc. They impinge on the surfaces of the outer ring, inner ring and retainer at various angles, and thus axial forces may be applied. When an axial force is applied, the rotating body may cause a jamming phenomenon in the open portion of the retainer, increasing friction of the bearing or causing malfunction.

Therefore, the present invention has been derived to solve the above problems, and one aspect of the present invention is a retainer member that can maintain integrity even in a situation where axial force is applied due to high-speed rotation and external force, a bearing retainer and a rotating bearing is intended to provide

Other objects of the present invention will become clearer through the examples described below.

A retainer member according to one aspect of the present invention is an annular retainer member forming a circular space configured to pass a shaft member extending in the axial direction, and a groove having a shape corresponding to a part of a rotating body is formed on one side to A plurality of insertion parts arranged spaced apart at designed intervals and defining a part of the accommodation space for accommodating the whole; A plurality of first coupling parts including a flat surface on one side and spaced apart from each other at designed intervals; and a coupling protrusion protruding along the axial direction from one side of the first coupling portion, wherein the coupling protrusion includes a protruding head having a circular shape; and a protruding neck extending between the protruding head and the first coupling portion, wherein a distance from a center of the circular shape of the protruding head to the first coupling portion may correspond to half of a width of the first coupling portion. there is.

A retainer member according to the present invention may have one or more of the following embodiments. For example, the length of the portion where the protruding neck meets the first coupling part is equal to the diameter of the protruding head, and the length of the portion where the protruding neck meets the protruding head is smaller than the diameter of the protruding head, so that the coupling protrusion A keyhole shape may be formed. In this case, both sides of the protruding neck may form an angle of 65 to 75 degrees with respect to one surface of the first coupling part, respectively.

The retainer member includes a plurality of second coupling portions including a flat surface on one side and disposed between the first coupling portions and alternately disposed with the first coupling portions; and a coupling groove formed on one surface of the second coupling portion in a concave shape corresponding to the coupling projection and configured to engage with the coupling projection, wherein the insertion portion is located between the adjacent first coupling portion and the second coupling portion. can be located in In this case, the plurality of first coupling portions and the plurality of second coupling portions have the same length and the same width and are arranged at equal intervals so that the retainer member is left-right symmetrical.

According to another aspect of the present invention, there is provided a bearing retainer formed by combining the above two retainer members.

A rotary bearing according to another aspect of the present invention is a rotary bearing for rotatably supporting a shaft member extending in an axial direction, comprising: an outer ring having an annular shape and having an outer race formed on an inner circumferential surface; a bearing retainer disposed inside the outer ring and having a plurality of receiving spaces penetrating in a radial direction at designed intervals along an outer circumferential surface thereof; a plurality of rotating bodies respectively disposed in the plurality of accommodating spaces and formed to contact the outer race and the inner race; It may include an inner ring disposed inside the bearing retainer and having the inner race formed on an outer circumferential surface thereof, wherein the first retainer member and the second retainer member are coupled by engagement of a plurality of coupling protrusions and a plurality of coupling grooves, It may be formed, at least one of the first retainer member and the second retainer member, a groove having a shape corresponding to a part of the rotating body is formed on one side to define a portion of the receiving space for accommodating the rotating body, A plurality of insertion parts disposed spaced apart at designed intervals; A plurality of first coupling parts including a flat surface on one side and spaced apart from each other at designed intervals; and a coupling protrusion protruding along the axial direction from one side of the first coupling portion, wherein the coupling protrusion includes a protruding head having a circular shape; and a protruding neck extending between the protruding head and the first coupling portion, wherein a distance from a center of the circular shape of the protruding head to the first coupling portion may correspond to half of a width of the first coupling portion. there is.

In the rotating bearing according to an embodiment of the present invention, the rotating body may be a roller having a cylindrical shape, and at least one of the outer race and the inner race includes a tread recessed to a first depth; and grooves recessed to a second depth greater than the first depth on both sides of the tread.

According to the problem solving means of the present invention as described above, various effects including the following can be expected. However, the present invention is not established when all of the following effects are exerted.

According to one embodiment of the present invention, it is possible to prevent unintended release of engagement between retainer members by distributing stress in the axial direction over the entire retainer member.

According to one embodiment of the present invention, manufacturing of the bearing retainer can be simplified by allowing the bearing retainer to be composed of retainer members having the same shape as each other.

According to one embodiment of the present invention, it is possible to reduce the possibility of defects by maintaining the correct position of the rotating body.

1 is a perspective view showing a rotary bearing according to a first embodiment of the present invention.
2 is a cross-sectional view showing a rotary bearing according to a first embodiment of the present invention.
3 is a cross-sectional view showing an outer ring, a bearing retainer, and an inner ring of a rotary bearing according to a first embodiment of the present invention.
4 is a perspective view showing the retainer member according to the first embodiment of the present invention.
5 is a perspective view showing a rotary bearing according to a second embodiment of the present invention.
6 is a cross-sectional view showing a rotating body bearing according to a second embodiment of the present invention.
7 is a cross-sectional view showing an outer ring, a bearing retainer, and an inner ring of a rotary bearing according to a second embodiment of the present invention.
8 is a perspective view showing a retainer member according to a second embodiment of the present invention.

Since the present invention can apply various transformations and have various embodiments, specific embodiments will be illustrated in the drawings and described in detail in the detailed description. However, it should be understood that this is not intended to limit the present invention to specific embodiments, and includes all transformations, equivalents, and substitutes included in the spirit and scope of the present invention. In describing the present invention, if it is determined that a detailed description of related known technologies may obscure the gist of the present invention, the detailed description will be omitted.

Terms used in this application are only used to describe specific embodiments, and are not intended to limit the present invention. Singular expressions include plural expressions unless the context clearly dictates otherwise. In this application, the terms "include" or "have" are intended to designate that there is a feature, number, step, operation, component, part, or combination thereof described in the specification, but one or more other features It should be understood that the presence or addition of numbers, steps, operations, components, parts, or combinations thereof is not precluded.

Terms such as first and second may be used to describe various components, but the components should not be limited by the terms. These terms are only used for the purpose of distinguishing one component from another.

Hereinafter, embodiments according to the present invention will be described in detail with reference to the accompanying drawings. description is omitted.

1 is a perspective view showing a rotary bearing 10 according to a first embodiment of the present invention, and FIG. 2 is a cross-sectional view showing a rotary bearing 10 according to a first embodiment of the present invention. 3 is a cross-sectional view showing the outer ring 150, the bearing retainer 100, and the inner ring 170 of the rotary bearing 10 according to the first embodiment of the present invention. 4 is a perspective view showing the retainer member 101 according to the first embodiment of the present invention.

1 to 4, the rotating body bearing 10 according to the first embodiment of the present invention largely includes an outer ring 150, a bearing retainer 100, a rotating body 140, and an inner ring 170 can do. In Figure 1, the outer ring 150 is represented by dotted lines to better see the remaining components.

The outer ring 150 is a member having an annular shape, and an outer race 160 may be formed on an inner circumferential surface of the annular shape. The outer race 160 is a race, that is, a part where the rotating body 140 contacts and moves, and may be recessed to a predetermined depth compared to the rest of the inner circumferential surface of the outer ring 150. As the material of the outer ring 150, a material that provides low frictional force and has high durability may be used. For example, a metal such as stainless steel or a synthetic resin such as polyether ether ketone (PEEK) may be used.

The bearing retainer 100 is a member disposed inside the outer ring 150 and has an annular shape and includes a plurality of accommodating spaces 130 along an outer circumferential surface. The shape of the accommodating space 130 may be formed in a shape corresponding to a cross section of the rotating body 140 on the outer surface of the bearing retainer 100 at the corresponding position. As depicted in FIGS. 1 and 3 , the bearing retainer 100 may be formed by combining two retainer members 101 and 102 .

The rotating body 140 is a member disposed in the accommodating space 130 of the bearing retainer 100 and mediates between the outer ring 150 and the inner ring 170 . Low frictional force and particularly high durability may be required for the rotating body 140 . The rotating body 140 may be implemented with a material such as PEEK or ceramic containing ZrO2.

As confirmed in FIG. 1 , in the first embodiment of the present invention, the rotating body 140 may have a spherical shape, and accordingly, the rotating body bearing 10 may be regarded as corresponding to a ball bearing. Since the rotating body 140 has a spherical shape, the accommodating space 130 may be formed in a circular shape. Since the rotating body 140 according to the first embodiment has a spherical shape and makes point contact with the outer ring 150 and the inner ring 170, respectively, it can provide very low frictional force between parts.

The inner ring 170 is a member disposed inside the bearing retainer 100 and has an annular shape, and an inner race 180 may be formed on an outer circumferential surface thereof. The inner race 180 is a part that the rotating body 140 contacts and moves, and may be recessed to a predetermined depth compared to the rest of the outer circumferential surface of the inner ring 170 . As the material of the inner ring 150, a material similarly providing low frictional force and strong durability may be used, and for example, a metal such as stainless steel or a synthetic resin such as PEEK may be used.

Referring to FIG. 2 , the diameter of the rotating body 140 is greater than the distance between the outer ring 150 and the inner ring 170. However, the rotating body 140 may be inserted into an expanded space due to the outer race 160 and the inner race 180 .

When the rotating body 140 is a sphere as in the first embodiment of the present invention, the outer race 160 may be formed in a curved shape so that its cross section forms an arc shape as depicted in FIGS. 2 and 3 . The radius of curvature of the arc shape of the outer race 160 may be equal to or greater than the radius of the rotating body 140 . As the radius of curvature of the outer race 160 is closer to the radius of the rotating body 140, the effect of maintaining the correct position of the rotating body 140 due to the restriction of the outer race 160 may increase, whereas the outer race ( As the radius of curvature of 160 is greater than that of the rotating body 140, the frictional force between the rotating body 140 and the outer ring 150 may be reduced.

Similarly, the inner race 180 may also be curved to form an arcuate cross section as depicted in FIGS. 2 and 3 . The radius of curvature of the arc shape of the inner race 180 may be equal to or greater than the radius of the rotating body 140 . As the radius of curvature of the inner race 180 is closer to the radius of the rotating body 140, the effect of maintaining the correct position of the rotating body 140 due to the restriction of the inner race 180 may increase, while the inner race ( As the radius of curvature of 180 is greater than that of the rotating body 140, the frictional force between the rotating body 140 and the outer ring 150 may be reduced.

Of course, only one of the outer race 160 and the inner race 180 may have an arc-shaped cross section, and even when the rotating body 140 has a spherical shape, the outer race 160 and the inner race 180 All can be configured with polygonal grooves.

Hereinafter, the bearing retainer 100 according to the first embodiment of the present invention and the retainer members 101 and 102 constituting the bearing retainer 100 according to the first embodiment of the present invention will be described in more detail with reference to FIGS. 3 and 4 .

As described above, the bearing retainer 100 may be formed by coupling two retainer members 101 and 102 together. That is, in a state where the rotating body 140 is disposed between the outer ring 150 and the inner ring 170 (specifically, between the outer race 160 and the inner race 180), the rotating body 140 Assembly of the rotary bearing 10 may be completed by combining the first retainer member 101 and the second retainer member 102 from both sides of the rotary body 140 interposed therebetween.

It may be advantageous for the retainer members 101 and 102 to be formed of a material capable of slight elastic deformation for smooth assembly, and for example, a material such as high-density polyethylene (HDPE) may be used.

1 to 3, the first retainer member 101 and the second retainer member 102 may have the same shape, but the present invention is not limited thereto, and in some embodiments not shown, the first retainer member ( 101) and the second retainer member 102 may have different shapes. The following description of the retainer member 101 can be applied to either the first retainer member 101 or the second retainer member 102 .

3 and 4, the retainer member 101 according to the first embodiment of the present invention includes an insertion portion 105, a first coupling portion 110, a coupling protrusion 112, and a second coupling portion 120. ) And may include a coupling groove (122). In particular, the annular retainer member 101 includes the insertion portion 105 and the coupling portion in the order of the insertion portion 105, the first coupling portion 110, the insertion portion 105, and the second coupling portion 120 ( 110 and 120 may be alternately arranged, and the insertion part 105 may be positioned between the first coupling part 110 and the second coupling part 120. The annular retainer member 101 forms a circular space therein, and this circular space corresponds to a space in which the inner ring 170 is disposed during assembly.

The insertion part 105 is a part in which a groove 131 having a shape corresponding to a part of the rotating body 140 is formed on one side, and the groove 131 is a part of the receiving space 130 for accommodating the rotating body 140. some can be defined. That is, when the accommodating space 130 is formed in a circular shape as shown in FIG. 3 , an arcuate groove 131 may be formed on one side of the retainer member 101 in the insertion portion 105 . The size of the groove 131 does not necessarily correspond to half (ie, a semicircle) of the receiving space 130, but when the retainer member 101 engages with the corresponding other retainer member 102, the two grooves 131 ) may be connected to form a complete circle of the receiving space 130.

The first coupling part 110 and the second coupling part 120 may be positioned between the insertion parts 105 . In embodiments of the present invention, the first coupling portion 110 corresponds to a portion where the coupling protrusion 112 is formed, and the second coupling portion 120 corresponds to a portion where the coupling groove 122 is formed. The first coupling part 110 and the second coupling part 120 may be alternately disposed, but the present invention is not limited thereto. For example, a configuration in which a plurality of first coupling portions 110 are continuously disposed through the insertion portion 105 and then a plurality of second coupling portions 120 are continuously disposed through the insertion portion 105. It is also possible, in the case where the first retainer member 101 and the second retainer member 102 have different shapes in the bearing retainer 100, one retainer member 101 has the first coupling part 110 without the first 2. Only the coupling part 120 is continuously arranged with the insertion part 105 interposed therebetween, and only the first coupling part 110 without the second coupling part 120 in the other retainer member 101 connects the insertion part 105. It is also possible to arrange continuously with interposition. As described above, when the bearing retainer 100 is composed of the first retainer member 101 and the second retainer member 102 having the same shape, in each of the first and second retainer members 101 and 102, the first It may be preferable that the coupling part 110 and the second coupling part 120 are alternately disposed.

Each of the first coupling portion 110 and the second coupling portion 120 has a groove 131 defining a part of the accommodation space 130 between them since the insertion portion 105 is disposed therebetween. you can also see The first coupling part 110 and the second coupling part 120 may have substantially the same shape except that the coupling protrusion 112 and the coupling groove 122 are formed. That is, the first coupling portion 110 and the second coupling portion 120 may have the same length and the same width and may be disposed at equal intervals. This causes the retainer member 101 to be left-right symmetrical, and even if the first and second retainer members 101 and 102 have the same shape, the first retainer member 101 is slightly biased relative to the second retainer member 102. By arranging the first and second retainer members 101 and 102 at an angle difference, the first coupling portion 110 and the second coupling portion 120 of each of the first and second retainer members 101 and 102 may be engaged with each other.

A coupling protrusion 112 is formed on one side of the first coupling portion 110 . The coupling protrusion 112 may protrude along the axial direction from one surface of the first coupling portion 110 . The first coupling portion 110 and the coupling protrusion 112 may form left and right layers. That is, each of the first coupling part 110 and the coupling protrusion 112 may have a left-right symmetrical shape, and the coupling protrusion 112 may also be positioned in the middle relative to the first coupling portion 110 .

A coupling groove 122 is formed in the second coupling portion 120 . The second coupling part 120 may include a flat surface on one side, and the coupling groove 122 may be formed in a concave shape corresponding to the coupling protrusion 112 on the flat surface. The second coupling portion 120 and the coupling groove 122 may be formed to form left and right layers.

When the first retainer member 101 and the second retainer member 102 are coupled to each other to form the bearing retainer 100, the engaging protrusion 112 of the first retainer member 101 is attached to the second retainer member 102. The coupling protrusion 112 of the second retainer member 102 may be inserted into the coupling groove 122 of the first retainer member 101 .

The coupling protrusion 112 may form a keyhole shape. That is, the coupling protrusion 112 may include a protruding head 114 and a protruding neck 116, the protruding head 114 may have a circular shape, and the protruding neck 116 may have a protruding head 114 and The first coupling part 110 may be connected. The coupling groove 122 having a shape corresponding to the coupling protrusion 112 also has a circular groove 124 corresponding to the protruding head 114 and an intermediate groove 126 corresponding to the protruding neck 116 to form a keyhole shape. can

Looking more specifically, the center of the protruding head 114 having a substantially circular shape may be located in the middle of the first coupling part 110 . That is, the distance from the center of the circular shape of the protruding head 114 to the first coupling portion 110 may correspond to approximately half of the width of the first coupling portion 110 . In this specification, the width of each portion of the retainer members 101 and 102 refers to a dimension in the axial direction, and the length of each portion of the retainer members 101 and 102 refers to a dimension in the circumferential direction. .

Since the center of the protruding head 114 corresponds to half the width of the first coupling portion 110, when the coupling protrusion 112 is inserted into the coupling groove 122, the coupling protrusion 112 extends to the corresponding retainer member 102. It is located at the center of the second coupling part 120, and stress applied to the retainer members 101 and 102 can be uniformly distributed in all directions. This has the advantage of preventing stress from being concentrated on a small portion and causing a weak link, and allowing all of the retainer members 101 and 102 to effectively bear the force.

In order to maximize the above advantages, any part of the first and second coupling parts 110 and 120 including the coupling protrusion 112 may not have an excessively small size. For example, when the width of the first and second coupling portions 110 and 120 is set to about 5 mm and the diameter of the protruding head 114 is set to about 3 mm, the first and second coupling portions 110, 120) may have a length or width of at least 1 mm.

The protruding neck 116 connects the protruding head 114 and the first coupling part 110, but the length of the portion where the protruding neck 116 meets the protruding head 114 is such that the protruding neck 116 is the first coupling part. It may be smaller than the length of the part where it meets (110). A length of a portion where the protruding neck 116 meets the first coupling portion 110 may be substantially the same as a diameter of the protruding head 114 . In this case, both sides 117 of the protruding neck 116 may each form an angle of 65 to 75 degrees with respect to one surface of the first coupling part 110 .

As the retainer member 101 formed of a material capable of slight elastic deformation has the above configuration, it is necessary to press the coupling protrusion 112 into the coupling groove 122 to couple the retainer members 101 and 102 to each other. it becomes possible When the coupling protrusion 112 is press-fitted into the coupling groove 122, the coupling protrusion 112 can be inserted into the circular groove 124 via the intermediate groove 126, and in the above configuration, the coupling protrusion 112 After the coupling protrusion 112 is inserted into the coupling groove 122 while ensuring that excessive force is not required during the process of inserting into the coupling groove 122, the coupling protrusion 112 is not easily separated, so that a strong coupling can be maintained.

In the retainer member 101, the bearing retainer 100, and the rotary bearing 10 according to the first embodiment of the present invention as described above, an axial force is applied to the rotary bearing 10 due to a driving force, a centrifugal force, or an external force. Even if the retainer members 101 and 102 are coupled to each other, they can be dispersed over the entire member to prevent the coupling from being released or the rotating body 140 from moving out of the correct position.

The structures of the outer and inner races 160 and 170 of the rotational body bearing 10 may help prevent the rotational body 140 from moving out of the correct position. That is, as the outer and inner races 160 and 170 are formed in a curved arc shape, the outer and inner races 160 and 170 move toward the rotor 140 as the spherical rotating body 140 deviate from the center. The angle of contact is inclined so that the rotating body 140 can be moved back to the center. This makes it possible to prevent defects and increase durability of not only the rotary bearing 10 but also the entire equipment such as a drive motor to which the rotary bearing 10 is applied.

In addition, according to the first embodiment of the present invention, since the bearing retainer 100 can be formed by combining the retainer members 101 and 102 molded into the same shape, manufacturing can be simplified and cost can be saved. can do.

Hereinafter, the rotating bearing 20 according to the second embodiment of the present invention will be described, and differences from the first embodiment will be mainly described. Unless otherwise stated, the features of the rotary bearing 10 according to the first embodiment are also applicable to the rotary bearing 20 according to the second embodiment.

5 is a perspective view showing a rotary bearing 20 according to a second embodiment of the present invention, and FIG. 6 is a cross-sectional view showing the rotary bearing 20 according to a second embodiment of the present invention. 7 is a cross-sectional view showing the outer ring 250, the bearing retainer 200, and the inner ring 270 of the rotary bearing 20 according to the second embodiment of the present invention. 8 is a perspective view showing a retainer member 201 according to a second embodiment of the present invention.

5 to 8, the rotating bearing 20 according to the second embodiment of the present invention largely includes an outer ring 250, a bearing retainer 200, a rotating body 240, and an inner ring 270 can do. In FIG. 5 , the outer ring 250 is represented by dotted lines so that the remaining components are more visible.

The outer ring 250 is a member having an annular shape, and an outer race 260 may be formed on an inner circumferential surface of the annular shape. As the material of the outer ring 250, a material that provides low frictional force and has high durability may be used, and for example, a metal such as stainless steel or a synthetic resin such as PEEK may be used.

The bearing retainer 200 is a member disposed inside the outer ring 250, has an annular shape, and includes a plurality of accommodating spaces 230 along the outer circumferential surface. The shape of the accommodating space 230 may be formed in a shape corresponding to a cross section of the rotating body 240 on the outer surface of the bearing retainer 200 at the corresponding position. As depicted in FIGS. 5 and 7 , the bearing retainer 200 may be formed by combining two retainer members 201 and 202 .

The rotating body 240 is a member disposed in the accommodating space 230 of the bearing retainer 200 and mediates between the outer ring 250 and the inner ring 270 . Low frictional force and particularly high durability may be required for the rotating body 240 . The rotating body 240 may be implemented with a material such as PEEK, for example.

As confirmed in FIG. 5 , in the second embodiment of the present invention, the rotating body 240 may have a cylindrical or cylindrical shape, and accordingly, the rotating body bearing 20 may be regarded as corresponding to a roller bearing. Since the rotating body 240 has a cylindrical shape, the accommodating space 230 may be formed in a quadrangular shape. Since the rotating body 240 according to the second embodiment has a cylindrical shape and makes line contact with the outer ring 250 and the inner ring 270, respectively, it can provide very low frictional force between parts.

The inner ring 270 is a member disposed inside the bearing retainer 200 and has an annular shape, and an inner race 280 may be formed on an outer circumferential surface thereof. The inner race 280 is a part that the rotating body 240 contacts and moves, and may be recessed to a predetermined depth compared to the rest of the outer circumferential surface of the inner ring 270 . As the material of the inner ring 250, a material similarly providing low frictional force and strong durability may be used, and for example, a metal such as stainless steel or a synthetic resin such as PEEK may be used.

Referring to FIG. 6 , the diameter of the rotating body 240 is greater than the distance between the outer ring 250 and the inner ring 270 . However, the rotating body 240 may be inserted into an expanded space due to the outer race 260 and the inner race 280 .

In this embodiment, the outer race 260 formed on the outer ring 250 may include a tread 262 and a groove 264 . The tread 262 is a portion recessed to a first depth, and the groove 264 is a portion recessed at both sides of the tread 262 to a second depth greater than the first depth. Similarly, inner race 280 formed on inner ring 270 may also include tread 282 and groove 284 .

When the grooves 264 and 284 are not provided on both sides of the treads 262 and 282, an axial force is applied to the rotating body 240 so that the rotating body 240 moves between the outer race 260 and the inner race 280. When the side wall is pressed, this part is deformed, and at the same time, the inner surfaces of the outer race 260 and the inner race 280 (that is, the inner circumferential surfaces of the annular groove) can be deformed together, which makes the rotating body 240 more eccentric. It may increase friction or cause jamming by pressing in the direction of However, as in the present embodiment, as the grooves 264 and 284 are provided on both sides of the treads 262 and 282, even if the rotating body 240 presses the sidewalls of the outer race 260 and the inner race 280, the tread ( 262 and 282 do not undergo deformation, and the rotating body 240 can move back to the central position by the elastic restoring force of the sidewalls of the outer race 260 and the inner race 280 . Even when only one of the outer race 260 and the inner race 280 includes the grooves 264 and 284, the above effect can be obtained to some extent.

Hereinafter, the bearing retainer 200 according to the second embodiment of the present invention and the retainer members 201 and 202 constituting the bearing retainer 200 according to the second embodiment of the present invention will be described in more detail with reference to FIGS. 7 and 8 .

As described above, the bearing retainer 200 may be formed by coupling two retainer members 201 and 202 together. That is, in a state in which the rotating body 240 is disposed between the outer ring 250 and the inner ring 270 (specifically, between the outer race 260 and the inner race 280), the rotating body 240 Assembly of the rotary bearing 20 may be completed by combining the first retainer member 201 and the second retainer member 202 from both sides of the rotary body 240 interposed therebetween.

It may be advantageous for the retainer members 201 and 202 to be formed of a material capable of slight elastic deformation for smooth assembly, and for example, a material such as high density polyethylene (HDPE) may be used.

5 to 7, the first retainer member 201 and the second retainer member 202 may have the same shape, but the present invention is not limited thereto, and in some embodiments not shown, the first retainer member ( 201) and the second retainer member 202 may have different shapes. The following description of the retainer member 201 can be applied to either the first retainer member 201 or the second retainer member 202 .

7 and 8, the retainer member 201 according to the second embodiment of the present invention includes an insertion portion 205, a first coupling portion 210, a coupling protrusion 212, and a second coupling portion 220. ) and a coupling groove 222 may be included. In particular, the annular retainer member 201 includes the insertion portion 205 and the coupling portion in the order of the insertion portion 205, the first coupling portion 210, the insertion portion 205, and the second coupling portion 220 ( 210 and 220 may be alternately arranged, and the insertion part 205 may be positioned between the first coupling part 210 and the second coupling part 220 . The annular retainer member 201 forms a circular space therein, and this circular space corresponds to a space in which the inner ring 270 is disposed during assembly.

The insertion part 205 is a part in which a groove 231 having a shape corresponding to a part of the rotating body 240 is formed on one side, and the groove 231 is a part of the receiving space 230 for accommodating the rotating body 240. some can be defined. That is, when the accommodating space 230 is formed in a rectangular shape as shown in FIG. 7 , the insert 205 may have a rectangular groove 231 formed on one side of the retainer member 201 . The size of the groove 231 does not necessarily correspond to half of the accommodating space 230, but when the retainer member 201 is coupled with the corresponding other retainer member 202, the two grooves 231 are connected and accommodated It can form a full rectangle of space 230 .

The first and second coupling parts 210 and 220, the coupling protrusion 212, the coupling groove 222, the protrusion head 214, and the protrusion neck 216 of the retainer member 201 according to the second embodiment of the present invention ) And descriptions of both sides 217, circular grooves 224, and intermediate grooves 226 are similar to those provided in relation to the retainer member 101 according to the first embodiment of the present invention, so duplicate descriptions will be omitted.

In the retainer member 201, the bearing retainer 200, and the rotary bearing 20 according to the second embodiment of the present invention as described above, an axial force is applied to the rotary bearing 20 due to a driving force, a centrifugal force, or an external force. Even if the retainer members 201 and 202 are coupled to each other, they may be dispersed over the entire member to prevent the coupling from being released or the rotating body 240 from moving out of the correct position.

The structures of the outer and inner races 260 and 270 of the rotating body bearing 20 may help prevent the rotating body 240 from being out of the correct position. That is, as the outer and inner races 260 and 270 include the grooves 264 and 284 on both sides of the treads 262 and 282, the cylindrical rotating body 240 is out of the center and the outer and inner races 260, 270), the treads 262 and 282 are prevented from being deformed together, and the rotating body 240 can move back to the center by the elastic restoring force of the sidewalls of the outer and inner races 260 and 270. there is. This makes it possible to prevent defects and increase durability of not only the rotary bearing 20 but also the entire equipment such as a drive motor to which the rotary bearing 20 is applied.

In addition, according to the second embodiment of the present invention, since the bearing retainer 200 can be formed by combining the retainer members 201 and 202 molded into the same shape, manufacturing can be simplified and cost can be saved. can do.

Although the above has been described with reference to some embodiments of the present invention, those skilled in the art can make various modifications to the present invention within the scope not departing from the spirit and scope of the present invention described in the claims below. It will be appreciated that modifications and changes may be made.

10, 20: rotating bearing 100, 200: bearing retainer
101, 102, 201, 202: retainer member 105, 205: insertion portion
112, 212: coupling protrusion 122, 222: coupling groove
150, 250: outer ring 170, 270: inner ring

Claims (8)

An annularly shaped retainer member defining a circular space configured to pass an axially extending shaft member,
A plurality of insertion units spaced apart from each other at designed intervals and defining a portion of a receiving space for accommodating the rotating body by forming a groove on one side corresponding to a part of the rotating body;
A plurality of first coupling parts including a flat surface on one side and spaced apart from each other at designed intervals; and
Including a coupling protrusion protruding along the axial direction from one side of the first coupling portion,
The coupling protrusion,
a circular protruding head; and
And a protruding neck extending between the protruding head and the first coupling part,
A retainer member, characterized in that a distance from the center of the circular shape of the protruding head to the first coupling portion corresponds to half of the width of the first coupling portion.
According to claim 1,
The length of the portion where the protruding neck meets the first coupling part is equal to the diameter of the protruding head, and the length of the portion where the protruding neck meets the protruding head is smaller than the diameter of the protruding head, so that the coupling protrusion forms a keyhole. shape, and the engaging protrusion is located in the middle in a direction along the outer circumferential surface of the first engaging portion, so that the shapes formed by the engaging protrusion and the first engaging portion form left-right symmetry.
According to claim 2,
The retainer member, characterized in that both sides of the protruding neck form an angle of 65 to 75 degrees with respect to one surface of the first coupling portion, respectively.
According to claim 1,
a plurality of second coupling portions including a flat surface on one side and disposed between the first coupling portions and alternately disposed with the first coupling portions; and
Further comprising a coupling groove formed in a concave shape corresponding to the coupling protrusion on one surface of the second coupling portion and configured to engage with the coupling protrusion,
The retainer member according to claim 1 , wherein the insertion portion is located between the first coupling portion and the second coupling portion adjacent to each other.
According to claim 4,
The retainer member, characterized in that the plurality of first coupling portions and the plurality of second coupling portions have the same length and the same width and are arranged at equal intervals so that the retainer member is symmetrical.
A bearing retainer formed by combining two retainer members according to any one of claims 1 to 5.
As a rotating bearing for rotatably supporting a shaft member extending in the axial direction,
an outer ring having an annular shape and an outer race formed on an inner circumferential surface;
a bearing retainer disposed inside the outer ring and having a plurality of receiving spaces penetrating in a radial direction at designed intervals along an outer circumferential surface thereof;
a plurality of rotating bodies respectively disposed in the plurality of accommodating spaces and formed to contact the outer race and the inner race;
Including an inner ring disposed inside the bearing retainer and having the inner race formed on an outer circumferential surface,
The bearing retainer is formed by coupling a first retainer member and a second retainer member by engagement of a plurality of coupling protrusions and a plurality of coupling grooves,
At least one of the first retainer member and the second retainer member,
A plurality of insertion units spaced apart from each other at designed intervals and defining a portion of a receiving space for accommodating the rotating body by forming a groove on one side corresponding to a part of the rotating body;
A plurality of first coupling parts including a flat surface on one side and spaced apart from each other at designed intervals; and
And a coupling protrusion protruding along the axial direction from one side of the first coupling portion,
The coupling protrusion,
a circular protruding head; and
And a protruding neck extending between the protruding head and the first coupling part,
The rotational bearing, characterized in that the distance from the center of the circular shape of the protruding head to the first coupling portion corresponds to half the width of the first coupling portion.
According to claim 7,
The rotating body is a roller having a cylindrical shape,
At least one of the outer race and the inner race,
a tread recessed to a first depth; and
Rotating bearing characterized in that it comprises a groove recessed to a second depth greater than the first depth on both sides of the tread.

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