CN114810842B

CN114810842B - Crossed bearing device

Info

Publication number: CN114810842B
Application number: CN202210738019.0A
Authority: CN
Inventors: 尹利; 张宇
Original assignee: Tianjin Dewar Intelligent Technology Co ltd
Current assignee: Tianjin Dewar Intelligent Technology Co ltd
Priority date: 2022-06-28
Filing date: 2022-06-28
Publication date: 2022-09-23
Anticipated expiration: 2042-06-28
Also published as: CN114810842A

Abstract

The application provides a crossed bearing device which comprises an inner rotor, a radial bearing, an upper cover, a lower cover and a position sensor, wherein the inner rotor is provided with a plurality of quadrant slits and a plurality of angle slits, and a first boss and a second boss extend out of the axis of the inner rotor to two sides; the radial bearings are respectively arranged on the first boss and the second boss; the upper cover and the lower cover are respectively provided with a first accommodating cavity for accommodating the radial bearing, and the upper cover is connected with the lower cover; the signal emitter and the signal receiver of the position sensor are respectively arranged on the upper cover and the lower cover, the inner rotor is positioned between the signal emitter and the signal receiver and rotates, and an optical signal transmitted between the signal emitter and the signal receiver simultaneously passes through the quadrant slit and the corresponding angle slit and is used for feeding back the rotation quadrant position of the inner rotor and the angle position in the corresponding quadrant. The technical scheme of this application has improved the life of bearing and can feed back the functioning speed and the rotation angle of bearing, has improved work efficiency.

Description

Crossed bearing device

Technical Field

The application relates to the technical field of bearings, in particular to a crossed bearing device.

Background

The cross roller bearing is most suitable for use in a joint part or a rotating part of an industrial robot, a rotating table of a machining center, a robot rotating part, a precision rotating table, a medical instrument, a gauge, an IC manufacturing apparatus, and the like because it is miniaturized to the minimum and has a very thin type, particularly a small size close to the limit and has high rigidity.

The crossed roller bearing is a new structure bearing for replacing a part requiring both centripetal force and thrust in recent years.

When the existing crossed bearing is used, the stability and the load performance of the crossed bearing are required to be improved, and meanwhile, the position and the rotating angle of the bearing cannot be fed back, so that the service life is prolonged, and the working efficiency is improved.

The statements in this background section merely disclose technology known to the inventors and do not, of course, represent prior art in the art.

Disclosure of Invention

The application aims at providing a crossed bearing device, and solves the problems that when an existing crossed bearing is used, the stability and the load performance are poor, and the number of rotation turns and the rotation angle of the bearing cannot be fed back accurately.

According to one aspect of the application, a crossed bearing device is provided, which comprises an inner rotor, a radial bearing, an upper cover, a lower cover and a position sensor, wherein the inner rotor is provided with a plurality of quadrant slits and a plurality of angle slits, a first boss and a second boss extend out of the axis of the inner rotor towards two sides, and the centers of the first boss and the second boss are provided with shaft holes; the radial bearings are respectively arranged on the first boss and the second boss; the upper cover and the lower cover are respectively provided with a first accommodating cavity for accommodating the radial bearing, and the upper cover is connected with the lower cover; the signal emitter and the signal receiver of the position sensor are respectively arranged on the upper cover and the lower cover, the inner rotor is positioned between the signal emitter and the signal receiver to rotate, and an optical signal transmitted between the signal emitter and the signal receiver simultaneously passes through a quadrant slit and a corresponding angle slit and is used for feeding back the rotation quadrant position of the inner rotor and the angle position in the corresponding quadrant.

According to some embodiments, the upper cover and the lower cover each further have a second accommodation chamber outside the first accommodation chamber.

According to some embodiments, the cross bearing device further includes horizontal bearings respectively disposed in the second accommodating cavities of the upper cover and the lower cover, and when the upper cover is connected to the lower cover, the horizontal bearings of the upper cover and the horizontal bearings of the lower cover abut against two sides of the inner rotor.

According to some embodiments, the inner rotor further has an origin hole through which an optical signal emitted by the signal emitter of the position sensor passes during rotation of the inner rotor, and the number of times the optical signal passes through the origin hole reflects the number of rotations of the inner rotor.

According to some embodiments, the origin hole has a pore diameter in the range of 0.01 to 0.4 mm.

According to some embodiments, the inner rotor is provided with 8 quadrant slits around the axis, so as to form 8 quadrants, and the angle of each quadrant is 45 ︒.

According to some embodiments, the 8-segment quadrant slit is a first quadrant slit, a second quadrant slit, a third quadrant slit, a fourth quadrant slit, a fifth quadrant slit, a sixth quadrant slit, a seventh quadrant slit, and an eighth quadrant slit;

the radius of each quadrant slit from the second quadrant slit to the eighth quadrant slit is increased by 0.01-0.8 mm compared with the radius of the slit in the previous quadrant.

According to some embodiments, the inner rotor has 8 angular slits, the 8 angular slits are respectively located in the 8 quadrants, and a start point or an end point of the quadrant slit and the angular slit in the same quadrant is located on a straight line with the axis of the inner rotor.

According to some embodiments, the angular slit in the same quadrant is perpendicular to a straight line between the start point of the quadrant slit and the angular slit and the axis of the inner rotor.

According to some embodiments, the starting point of each segment of angular slit is at the same distance from the axis of the inner rotor, the angular slit being located outside the quadrant slit.

Based on the crossed bearing device, the optical signal transmitted between the signal transmitter and the signal receiver simultaneously passes through the quadrant slit and the corresponding angle slit, and the quadrant position to which the inner rotor rotates and the angle position in the corresponding quadrant are fed back, so that the running speed and the rotation angle of the bearing are obtained, the service life of the bearing is prolonged, and the working efficiency of the bearing is improved.

For a better understanding of the nature and technical content of the present application, reference should be made to the following detailed description and accompanying drawings, which are provided to illustrate the present application and are not intended to limit the scope of the present application in any way.

Drawings

Embodiments of the present disclosure are described in detail below with reference to the accompanying drawings. The accompanying drawings, which are incorporated herein and constitute part of this disclosure, serve to provide a further understanding of the disclosure. The exemplary embodiments of the present disclosure and their description are provided to explain the present disclosure and not to limit the present disclosure. In the drawings:

fig. 1 shows an exploded view of a cross bearing according to an exemplary embodiment of the present application.

Fig. 2 shows a schematic structural view of an inner rotor according to an exemplary embodiment of the present application.

Fig. 3 shows a first schematic diagram of a position sensor in relation to the position of an inner rotor according to an example embodiment of the present application.

Fig. 4 shows a second schematic diagram of a position sensor and inner rotor position relationship according to an example embodiment of the present application.

Fig. 5 shows a third schematic diagram of a position sensor in relation to the position of the inner rotor according to an example embodiment of the present application.

Fig. 6 shows a schematic diagram of the relationship between quadrant slits and angle slits feeding back the rotation angle of the inner rotor according to an exemplary embodiment of the present application.

Detailed Description

In the following, only certain exemplary embodiments are briefly described. As those skilled in the art will recognize, the described embodiments may be modified in various different ways, all without departing from the spirit or scope of the present invention. Accordingly, the drawings and description are to be regarded as illustrative in nature, and not as restrictive.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like, indicate orientations and positional relationships based on those shown in the drawings, and are used only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be considered as limiting the present invention. Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", may explicitly or implicitly include one or more of the described features. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.

In the description of the present invention, it should be noted that unless otherwise explicitly stated or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection, either mechanically, electrically, or in communication with each other; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the present invention, unless expressly stated or limited otherwise, the recitation of a first feature "on" or "under" a second feature may include the recitation of the first and second features being in direct contact, and may also include the recitation that the first and second features are not in direct contact, but are in contact via another feature between them. Also, the first feature "on," "above" and "over" the second feature may include the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly above and obliquely above the second feature, or simply meaning that the first feature is at a lesser level than the second feature.

The following disclosure provides many different embodiments or examples for implementing different features of the invention. To simplify the disclosure of the present invention, the components and arrangements of specific examples are described below. Of course, they are merely examples and are not intended to limit the present invention. Furthermore, the present invention may repeat reference numerals and/or letters in the various examples, such repetition is for the purpose of simplicity and clarity and does not in itself dictate a relationship between the various embodiments and/or configurations discussed. In addition, the present invention provides examples of various specific processes and materials, but one of ordinary skill in the art may recognize applications of other processes and/or uses of other materials.

The preferred embodiments of the present invention will be described below with reference to the accompanying drawings, and it should be understood that the preferred embodiments described herein are merely for purposes of illustrating and explaining the present invention and are not intended to limit the present application.

As shown in fig. 1, according to an exemplary embodiment of the present application, the present application discloses a crossed bearing apparatus 10 including an inner rotor 105, a radial bearing 103, an upper cover 101, a lower cover 107, and a position sensor 110.

The inner rotor 105 is provided with a plurality of quadrant slits 1051 and a plurality of angle slits 1052, a first boss 1054 and a second boss 1055 extend out of the axis of the inner rotor 105 to two sides, and the centers of the first boss 1054 and the second boss 1055 are provided with shaft holes; the radial bearings 103 are respectively disposed on the first boss 1054 and the second boss 1055; the upper cover 101 and the lower cover 107 are respectively provided with a first accommodating cavity for accommodating the radial bearing 103, and the upper cover 101 is connected with the lower cover 107; the signal emitter 106 and the signal receiver 102 of the position sensor 110 are respectively arranged on the upper cover 101 and the lower cover 107, the inner rotor 105 is positioned between the signal emitter 106 and the signal receiver 102 for rotation, and an optical signal transmitted between the signal emitter 106 and the signal receiver 102 simultaneously passes through the quadrant slits and the corresponding angle slits for feeding back the quadrant position of the rotation of the inner rotor 105 and the angle position in the corresponding quadrant.

According to the embodiment of the application, after the upper cover 101 and the lower cover 107 are assembled, the outer rotor of the crossed bearing can be used for being connected to a fixed part of mechanical equipment, and the inner rotor 105 can be connected to a rotating part of the mechanical equipment, so that the mechanical equipment can accurately acquire information such as the rotating speed and the rotating angle of the bearing.

The upper cover 101 and the lower cover 107 are made of TPU materials, certain weight can be reduced relative to a bearing made of all-steel materials, so that the running speed and the rotation accuracy of the bearing are guaranteed, the working efficiency is improved, and meanwhile, the cost is effectively reduced under the condition that the precision is not lost.

The inner rotor 105 may have a disk-shaped structure, and radial bearings 103 at both sides of the inner rotor 105 rotatably mount the inner rotor 105 between the upper cover 101 and the lower cover 107, and feed back the rotation angle and rotation speed of the inner rotor 105 by using quadrant slits and angle slits on the inner rotor 105, which will be described in detail below.

The structure capable of installing the position sensor 110 is arranged at the corresponding position of the upper cover 101 and the lower cover 107, the signal emitter 106 of the position sensor 110 can be a laser emitter, the structure for installing the signal receiver 102 of the upper cover 101 is fixedly connected with the signal receiver 102, the signal emitter is arranged on the inner side of the upper cover 101 and positioned between the inner rotor 105 and the upper cover 101, and a binding post of the signal emitter is led to the outer side of the upper cover 101, namely, the signal receiver 102 is installed, similarly, the signal emitter 106 is fixed on the inner side of the lower cover 107 and positioned between the lower cover 107 and the inner rotor 105, and the binding post of the signal emitter is led to the outer side of the lower cover 107, namely, the signal emitter 106 is installed completely, and the signal emitter 106 and the signal receiver 102 are arranged oppositely. The signal transmitter 106 is used for transmitting signals, and the signal receiver 102 is used for receiving the signals transmitted by the signal transmitter 106.

This application has realized that its rotation angle and speed are fed back to the crossed bearing, can control its operating mode that uses accurately to can its life that improves. When the use condition of the bearing needs to be accurately obtained, the crossed bearing can be easily obtained.

According to the embodiment of the present application, the upper cover 101 and the lower cover 107 each further have a second accommodation chamber outside the first accommodation chamber.

The first accommodating cavity is a circular groove and is positioned at the central position of the cross bearing, and the second accommodating cavity is an annular groove and is positioned at the edge position close to the cross bearing.

The diameter of the first accommodating cavity can be matched with the outer ring of the radial bearing 103, the first boss 1054 and the second boss 1055 are matched with the inner ring of the radial bearing 103, so that the inner rotor 105 can be firmly arranged between the upper cover 101 and the lower cover 107, the depth of the first accommodating cavity can be matched with the thickness of the radial bearing 103, of course, the size of the first accommodating cavity is not limited in the application, the size of the radial bearing 103 can be selected according to the size of the cross bearing required in practice, and the size of the first accommodating cavity is finally determined.

According to the embodiment of the present application, the cross bearing device 10 further includes the horizontal bearings 104 respectively disposed in the second accommodating cavities of the upper cover 101 and the lower cover 107, and when the upper cover 101 is connected to the lower cover 107, the horizontal bearings 104 of the upper cover 101 and the horizontal bearings 104 of the lower cover 107 abut against both sides of the inner rotor 105.

The diameter of the second accommodating cavity can be matched with the outer ring of the horizontal bearing 104, the depth of the second accommodating cavity can be matched with the thickness of the horizontal bearing 104, of course, the size of the second accommodating cavity is not limited in the application, the size of the horizontal bearing 104 can be selected according to the size of the cross bearing required in practice, and the size of the second accommodating cavity is finally determined.

Being close to inner rotor 105 edge, the horizontal bearing 104 of inner rotor 105 both sides firmly abuts it, under the common effect of radial bearing 103 and horizontal bearing 104, can not only strengthen inner rotor 105's rotational stability, also can increase cross bearing's load simultaneously to ensured whole cross bearing's operation, improved life, avoided the change of multifrequency.

Fig. 2 shows a schematic structural view of an inner rotor according to an exemplary embodiment of the present application. Fig. 3 shows a first schematic diagram of a position sensor in relation to the position of an inner rotor according to an example embodiment of the present application. Fig. 4 shows a second schematic diagram of a position sensor and inner rotor position relationship according to an example embodiment of the present application. Fig. 5 shows a third schematic diagram of a position sensor in relation to the position of the inner rotor according to an example embodiment of the present application.

As shown in fig. 2 to 5, according to the embodiment of the present application, the inner rotor 105 further has an origin hole 1053, during the rotation of the inner rotor 105, the optical signal emitted from the signal emitter 106 of the position sensor 110 passes through the origin hole 1053 to be received by the signal receiver 102, and the number of times the optical signal passes through the origin hole 1053 reflects the number of rotations of the inner rotor 105.

The origin hole 1053 is provided in the inner rotor 105 to record the number of rotations of the inner rotor 105.

According to the embodiment of the application, the aperture range of the origin hole 1053 is 0.01-0.4 mm. The aperture of the origin hole 1053 can be 0.1 mm.

According to the embodiment of the application, the inner rotor 105 is distributed with 8 sections of quadrant slits by taking the axis as the center of a circle, the quadrant slits are arc slits with the same radius, 8 quadrants are formed, and the angle of each quadrant is 45 ︒.

The 8 sections of quadrant slits are a first quadrant slit, a second quadrant slit, a third quadrant slit, a fourth quadrant slit, a fifth quadrant slit, a sixth quadrant slit, a seventh quadrant slit and an eighth quadrant slit; the 8 segments of quadrant slits are connected end to end, starting from the starting point of the first quadrant slit, rotating by a radius a of 45 ︒, at which time the first quadrant slit ends, forming a first quadrant, immediately after the end point of the first quadrant slit, increasing b based on the radius of the first quadrant slit, forming the starting point of the second quadrant slit, rotating by a radius a + b of 45 ︒, forming a first quadrant slit, namely a second quadrant, immediately after the end point of the second quadrant slit, increasing 2b based on the radius of the first quadrant slit, forming the starting point of the third quadrant slit, rotating by a radius a +2b of 45 ︒, forming a third quadrant slit, namely a third quadrant, and so on, forming 8 quadrants.

The radius of each quadrant slit from the second quadrant slit to the eighth quadrant slit is increased by 0.01-0.8 mm compared with the radius of the slit in the previous quadrant. The radius of the rear quadrant slit can be 0.4mm larger than that of the front quadrant slit.

According to the embodiment of the application, the slit width of each quadrant slit and each angle slit is 0.01-0.2 mm.

According to the embodiment of the application, the inner rotor 105 is provided with 8 sections of angle slits, the angle slits are linear slits, the 8 sections of angle slits are respectively positioned in 8 quadrants, and the starting point or the ending point of the quadrant slits and the angle slits in the same quadrant and the axis of the inner rotor 105 are positioned on the same straight line. It can be understood that, taking the first quadrant as an example, the starting point of the first quadrant slit and the starting point of the first angle slit are located on a straight line with the axis of the inner rotor 105. Of course, the end point of the first quadrant slit and the end point of the first angle slit are also located on the same straight line with the axial center of the inner rotor 105. Similarly, the quadrant slits and angle slits for the other quadrants are also the same.

The origin hole 1053 is located on a line connecting the starting points of the first quadrant slit and the first angle slit and the axis of the inner rotor 105. The origin hole 1053 is located between the start points of the first quadrant slits and the first angle slits.

According to an embodiment of the present application, the angle slit in the same quadrant is perpendicular to a straight line between the start point of the quadrant slit and the angle slit and the axis of the inner rotor 105. It is understood that the first angle slit is perpendicular to the line connecting the start of the first quadrant slit, the start of the first angle slit and the axis of the inner rotor 105, and the same applies to the other angle slits.

According to the embodiment of the application, the distance from the starting point of each section of angle slit to the axle center of the inner rotor 105 is the same, and the angle slit is positioned on the outer side of the quadrant slit. The starting point of the first angle slit is counted from the outer side of the end point of the 8 th quadrant slit. That is, the distance from the start point of the first angle slit to the axis of the inner rotor 105 is greater than the distance from the end point of the 8 th quadrant slit to the axis of the inner rotor 105.

Referring to fig. 6, the process of feeding back the rotation angle of the inner rotor 105:

when the inner rotor 105 rotates clockwise, the optical signal of the position sensor 110 passes through the origin hole 1053, the start point of the first quadrant slit, and the start point of the first angle slit, the cross bearing is fed back to start working, and the working state of the cross bearing is determined by the data fed back by the position sensor 110.

The number of times the optical signal of the position sensor 110 passes through the origin hole 1053 is the number of rotations of the inner rotor 105.

When the rotation angle of the inner rotor 105 is in the first quadrant, only the rotation angle in the first quadrant, which is smaller than 45 ︒, can be obtained through the slit of the first quadrant, and the rotation angle of the inner rotor 105 in the first quadrant cannot be known.

At this time, the angle of rotation of the inner rotor 105 in the first quadrant needs to be fed back through the first angle slit.

The distance OO ' from the starting point O ' of the first quadrant slit to the axis O of the inner rotor 105 is a fixed value, and OO ' =29mm may be used in this application.

The starting point of the first angle slit in fig. 6 is a and the end point is B, and further, when the inner rotor 105 rotates, the point B may be the end point of the first angle slit that crosses the position of the position sensor 110, and two straight lines OA and AB are perpendicular to each other. Of course, the starting point and the end point of the other angle slits are the same as the first angle slit.

When the inner rotor 105 rotates clockwise, the optical signal of the position sensor 110 moves in the direction from OA to OB of the inner rotor 105, the angle AOB =45 °, the angle range of the first quadrant is 0-45 °, the position of the first angle slit crossing the position sensor 110 is 0-45 °, the specific angle of the angle AOB can be obtained by feeding back the distance AB crossing the first angle slit through the position sensor 110, and the angle AOB = arctan (c/OA) can be obtained by assuming that the distance crossing the first angle slit is c, i.e., the distance AB, fed back by the position sensor 110, so that the angle of the inner rotor 105 rotating in the first quadrant can be obtained. By analogy, the position indicated by the slit of the next angle quadrant is the second quadrant, the angle range is 45-90 °, the position where the angle slit crosses the position sensor 110 is 45-90 °, the specific angle of ═ AOB can be obtained by feeding back the distance crossing the second angle slit by the position sensor 110, and assuming that the distance where the position sensor 110 feeds back the second angle slit is c, that is, the distance AB, the angle AOB = arctan (c/OA) can be obtained, and the angle of rotation of the inner rotor 105 in the second quadrant can be obtained. By analogy, the method for calculating the rotation angle of the inner rotor 105 by the third angle slit, the fourth angle slit, the fifth angle slit, the sixth angle slit, the seventh angle slit and the eighth angle slit is similar to the method for calculating the first angle slit, and is not described herein again.

Therefore, when the cross bearing of the application runs, the 8 quadrant slits are used for feeding back the quadrant position to which the inner rotor 105 rotates, the 8 angle slits specifically feed back the rotated angle in each quadrant, the absolute position of the bearing movement can be fed back, and the defect that the previous similar bearing does not have position feedback is overcome.

Finally, it should be noted that: although the present disclosure has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that changes may be made in the embodiments and/or equivalents thereof without departing from the spirit and scope of the disclosure. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present disclosure should be included in the protection scope of the present disclosure.

Claims

1. A crossed bearing apparatus, comprising:

the inner rotor is provided with a plurality of quadrant slits and a plurality of angle slits, a first boss and a second boss extend from the axis of the inner rotor to two sides, shaft holes are formed in the centers of the first boss and the second boss, the angle slits are located on the outer side of the quadrant slits, the angle slits in the same quadrant are perpendicular to a straight line between the starting point of the quadrant slits and the angle slits and the axis of the inner rotor, the starting point of the quadrant slits and the angle slits in the same quadrant and the axis of the inner rotor are located on the same straight line, and the ending point of the quadrant slits and the angle slits in the same quadrant and the axis of the inner rotor are located on the same straight line;

the radial bearings are respectively arranged on the first boss and the second boss;

the upper cover and the lower cover are respectively provided with a first accommodating cavity for accommodating the radial bearing, and the upper cover is connected with the lower cover;

the inner rotor is positioned between the signal emitter and the signal receiver and rotates, and an optical signal transmitted between the signal emitter and the signal receiver simultaneously passes through a quadrant slit and a corresponding angle slit and is used for feeding back the quadrant position of the rotation of the inner rotor and the angle position in the corresponding quadrant.

2. The cross bearing apparatus of claim 1, wherein the upper cover and the lower cover each further have a second housing chamber outside the first housing chamber.

3. The crossed bearing apparatus according to claim 2, further comprising horizontal bearings respectively disposed in the second housing cavities of the upper cover and the lower cover, wherein when the upper cover is connected to the lower cover, the horizontal bearings of the upper cover and the horizontal bearings of the lower cover abut against both sides of the inner rotor.

4. The crossed bearing apparatus in accordance with claim 1 wherein the inner rotor further has origin holes through which optical signals emitted by the signal emitter of the position sensor pass during rotation of the inner rotor, and the number of times the optical signals pass through the origin holes reflects the number of rotations of the inner rotor.

5. The crossed bearing device according to claim 4, wherein the diameter of the origin hole is in the range of 0.01 to 0.4 mm.

6. The crossed bearing assembly of claim 4, wherein the inner rotor has 8 quadrant slits centered around the shaft center, forming 8 quadrants, each quadrant having an angle of 45 ︒.

7. The crossed bearing assembly of claim 6, wherein the 8-segment quadrant slit is a first quadrant slit, a second quadrant slit, a third quadrant slit, a fourth quadrant slit, a fifth quadrant slit, a sixth quadrant slit, a seventh quadrant slit, and an eighth quadrant slit;

8. The crossed bearing apparatus according to claim 7, wherein the inner rotor has 8 segments of angular slits thereon, the 8 segments of angular slits being located in the 8 quadrants, respectively.

9. The crossed bearing apparatus according to claim 8, wherein the distance from the starting point of each segment of angular slit to the axial center of the inner rotor is the same.