CN218416030U - BLDC motor bearing - Google Patents

Abstract

The utility model discloses a BLDC motor bearing, including bearing inner race, bearing inner race and a plurality of globular rolling element, the bearing inner race sets up in the outside of bearing inner race, and the roll connection has globular rolling element between bearing inner race and the bearing inner race, and the bearing inner race is provided with the outer lane channel towards surrounding on the internal perisporium of bearing inner race, and the bearing inner race is provided with the inner circle channel corresponding with the outer lane channel towards surrounding on the periphery wall of bearing outer race; the outer ring channel and the inner ring channel are matched to form a rolling track for the spherical rolling body to roll; the diameter of the spherical rolling body is 2.778mm; the flange coefficient of the bearing outer ring is 0.32, and the flange coefficient of the bearing inner ring is 0.296. The utility model discloses its noise that can effectively reduce BLDC motor bearing when operation has improved the rated static load of BLDC bearing simultaneously, can bear bigger equivalent load, prolongs the life of BLDC bearing.

Description

BLDC motor bearing

Technical Field

The utility model belongs to the technical field of the bearing design and specifically relates to a BLDC motor bearing.

Background

The BLDC motor is widely used in various products, such as a BLDC outer rotor motor for an air cleaner.

The problem that the noise is poor after the bearing is installed due to the poor concentricity of a motor support (a bearing chamber), the poor positioning verticality of a press-mounting tool and the like is solved; the core shaft of the BLDC motor is typically made to mate loosely with the inner bore of the BLDC motor bearing, and the outer bearing diameter is made to mate loosely with the motor bracket (bearing housing).

The existing BLDC motor bearing adopts a steel ball with the diameter of 2.381mm, a bearing outer ring with the flange coefficient of 0.2 and a bearing inner ring with the flange coefficient of 0.245, the BLDC motor bearing is loosely matched with a bearing chamber and a mandrel of a BLDC motor, the BLDC bearing can slightly swing in the starting process of the BLDS motor, the bearing steel ball runs in an S shape under the stress of a channel, so that the steel ball is easy to run on the groove edges of an outer ring channel and an inner ring channel, and the roughness of the groove edges of the outer ring channel and the inner ring channel during grinding and channel superfinishing is different from the difference between the groove bottom and the groove waist of the outer ring channel and the groove edge of the inner ring channel, so that the ball can generate larger noise and has large friction force during the running of the groove edges of the outer ring channel and the inner ring channel.

SUMMERY OF THE UTILITY MODEL

In order to overcome the defects in the prior art, the utility model provides a BLDC bearing, the diameter of a spherical rolling body is 2.778mm, the flange coefficient of a bearing outer ring is 0.32, and the flange coefficient of a bearing inner ring is 0.296; when the BLDC motor bearing runs, the spherical rolling bodies move at the groove bottoms and the groove waist parts of the outer ring groove and the inner ring groove, so that the spherical rolling bodies are prevented from running at the groove edges of the outer ring groove and the inner ring groove; the noise of BLDC motor bearing during operation can be effectively reduced, the rated static load of BLDC bearing is improved simultaneously, larger equivalent load can be born, and the service life of BLDC bearing is prolonged.

In order to achieve the purpose, the utility model adopts the following technical scheme:

a BLDC motor bearing comprises a bearing inner ring, a bearing outer ring and a plurality of spherical rolling bodies, wherein the bearing outer ring is arranged on the outer side of the bearing inner ring, the spherical rolling bodies are connected between the bearing outer ring and the bearing inner ring in a rolling mode, an outer ring channel is arranged on the inner peripheral wall, facing the bearing inner ring, of the bearing outer ring in a surrounding mode, and an inner ring channel corresponding to the outer ring channel is arranged on the outer peripheral wall, facing the bearing outer ring, of the bearing inner ring in a surrounding mode; the outer ring channel and the inner ring channel are matched to form a rolling track for the spherical rolling bodies to roll;

the diameter of the spherical rolling body is 2.778mm;

the flange coefficient of the bearing outer ring is 0.32, and the flange coefficient of the bearing inner ring is 0.296.

The flange coefficient of the bearing outer ring can be understood as follows: the ratio of the difference between the diameter of the circle where the lowest position of the outer ring channel is located and the inner diameter of the bearing outer ring to the diameter of the spherical rolling body; the lowest point of the outer ring channel can be understood as: and along the depth direction of the recess of the outer ring channel, the position, farthest away from the inner peripheral wall of the bearing outer ring, in the outer ring channel.

The flange coefficient of the bearing inner ring can be understood as follows: the ratio of the diameter difference between the outer diameter of the bearing outer ring and the diameter of the circle where the lowest part of the inner ring channel is located to the diameter of the spherical rolling body; the lowest point of the inner ring channel can be understood as: and along the depth direction of the depression of the inner ring channel, the inner ring channel is farthest away from the outer peripheral wall of the bearing inner ring.

By adopting the structure, compared with the existing BLDC motor bearing, the flange coefficient of the bearing outer ring, the flange coefficient of the bearing inner ring and the diameter of the spherical rolling body are adjusted, so that when the BLDC motor bearing runs, the spherical rolling body moves at the groove bottom and the groove waist of the outer ring channel and the inner ring channel, and the spherical rolling body is prevented from running on the groove edges of the outer ring channel and the inner ring channel;

the roughness of the groove edges of the outer ring groove and the inner ring groove is relative to the groove bottom and the groove waist position difference of the outer ring groove and the inner ring groove during grinding and channel superfinishing, so that the structure can effectively reduce the noise of the BLDC motor bearing during operation, simultaneously improve the rated static load of the BLDC bearing, bear larger equivalent load and prolong the service life of the BLDC bearing.

Further, the axial play of the BLDC motor bearing is 0.01mm.

The axial play can be understood as: when the bearing inner ring or one of the bearing inner rings is fixed and the other is moved relative to the bearing inner ring from one extreme position to the other extreme position along the axial direction when the bearing inner ring or the bearing inner ring is not loaded.

Further, the number of the spherical rolling elements is 7.

Further, a retainer is arranged in the circumferential direction between the bearing inner ring and the bearing outer ring, ball mounting grooves matched with the spherical rolling bodies are formed in the retainer in the circumferential direction, the number of the ball mounting grooves is matched with the number of the spherical rolling bodies, and the ball mounting grooves face the two sides of the bearing inner ring and the bearing outer ring and penetrate through the retainer to form a first opening and a second opening respectively.

By adopting the structure, the spherical rolling body is arranged in the ball body mounting groove and is respectively in rolling fit with the inner ring channel of the bearing inner ring and the outer ring channel of the bearing outer ring through the first opening and the second opening;

the retainer can be used for spacing the plurality of spherical rolling bodies, so that the spherical rolling bodies are prevented from colliding and rubbing with each other when the BLDC motor bearing works.

Further, a plurality of the ball mounting grooves are equidistantly arranged along the circumferential direction of the retainer.

Adopt above-mentioned structure, the spheroid mounting groove along holder circumference equidistance sets up and is a plurality of the globular rolling element is along holder circumference equidistance sets up for load average distribution, so that BLDC motor bearing operation is more stable.

Furthermore, one side of the ball mounting groove in the axial direction of the retainer is provided with a third opening, two ends of the third opening are respectively protruded to form a first limiting part and a second limiting part, the first limiting part and the second limiting part extend towards the side of the axis of the third opening in an inclined manner so as to limit the spherical rolling element in the ball mounting groove, and the first limiting part and the second limiting part can deform along the direction away from the axis of the third opening.

With the above configuration, the spherical rolling elements are fitted into or taken out from the sphere mounting groove through the third opening; in the installation process, the spherical rolling body is contacted with the first limiting part and the second limiting part, and the first limiting part and the second limiting part deform towards the direction far away from the axis of the third opening so that the spherical rolling body enters the spherical mounting groove, and at the moment, the first limiting part and the second limiting part restore towards the direction close to the axis of the third opening so as to limit the spherical rolling body in the spherical mounting groove and prevent the spherical rolling body from separating from the spherical mounting groove; in the taking-out process, the spherical rolling body is in contact with the first limiting part and the second limiting part, so that the first limiting part and the second limiting part deform in the direction away from the axial direction of the third opening, so that the spherical rolling body is taken out from the spherical mounting groove, and after the spherical rolling body is taken out from the spherical mounting groove, the first limiting part and the second limiting part restore in the direction close to the axial direction of the third opening.

Specifically, the retainer is made of a nylon material.

Further, the BLDC motor bearing includes cover plates disposed at both sides of the rolling rail to prevent foreign materials from entering the rolling rail.

By adopting the structure, the cover plate can prevent impurities such as dust from entering the rolling track to influence the stability and reliability of the BLDC motor bearing, and the service life of the BLDC motor bearing can be effectively prolonged.

Furthermore, one end of the cover plate is arranged on the bearing outer ring, the other end of the cover plate extends towards the bearing inner ring, and a gap exists between one end of the cover plate extending towards the bearing inner ring and the bearing inner ring.

By adopting the structure, because the bearing inner ring and the bearing outer ring rotate relatively, one end of the cover plate is arranged on the bearing outer ring to realize the fixation of the cover plate, the other end of the cover plate extends towards the bearing outer ring to prevent sundries from entering the rolling track, and a gap is formed between the cover plate and the bearing inner ring to prevent the cover plate from influencing the movement of the bearing inner ring relative to the bearing outer ring.

Furthermore, the position of the bearing outer ring where the cover plate is installed is inwards recessed to form an installation groove, and a clamping part matched and clamped with the installation groove is arranged at one end of the cover plate, which is used for being connected with the bearing outer ring; specifically, the clamping portion is formed by flanging the cover plate and one end of the bearing outer ring, wherein the end of the cover plate is connected with the bearing outer ring.

Furthermore, the cover plate comprises a cover plate body and a clamping part arranged at one end of the cover plate body and used for being connected with the bearing outer ring, the cover plate body comprises a first plane, one end of the first plane is connected with the clamping part, the other end of the first plane is connected with one end of a first inclined plane, the other end of the first inclined plane extends towards the side far away from the rolling track in an inclined mode and is connected with one end of a second plane, the other end of the second plane bends towards the rolling track in a side bending mode to form a first folding edge, and the first plane is parallel to the second plane;

the clamping part comprises a third plane with one end connected with the first plane, an included angle is formed between the third plane and the first plane, and the first plane and the third plane are in arc transition connection; the other end of the third plane is provided with a first arc, the central angle of the first arc is 180 degrees, and specifically, the third plane is perpendicular to the first plane.

By adopting the structure, the cover plate is not easy to fall off from the bearing outer ring.

Further, the curvature coefficient of the outer ring channel is 0.56, and the curvature coefficient of the inner ring channel is 0.5.

The curvature coefficient of the outer ring channel can be understood as: the ratio of the radius of the outer race channel to the diameter of the spherical rolling elements;

the curvature coefficient of the inner ring channel can be understood as: a ratio of a radius of the inner race channel to a diameter of the spherical rolling element;

by adopting the structure, the curvature coefficient of the outer ring channel and the curvature coefficient of the inner ring channel are selected, so that the spherical rolling bodies further move at the groove bottoms and the groove waist parts of the outer ring channel and the inner ring channel, and the spherical rolling bodies are prevented from running at the groove edges of the outer ring channel and the inner ring channel.

Compared with the prior art, the utility model discloses following beneficial effect has: the BLDC bearing of the utility model has the diameter of the spherical rolling body of 2.778mm, the flange coefficient of the outer ring of the bearing of 0.32 and the flange coefficient of the inner ring of the bearing of 0.296; when the BLDC motor bearing runs, the spherical rolling bodies move at the groove bottoms and the groove waist parts of the outer ring groove and the inner ring groove, so that the spherical rolling bodies are prevented from running at the groove edges of the outer ring groove and the inner ring groove; the noise of BLDC motor bearing during operation can be effectively reduced, the rated static load of BLDC bearing is improved simultaneously, larger equivalent load can be born, and the service life of BLDC bearing is prolonged.

Drawings

Fig. 1 is a schematic structural diagram of the BLDC motor bearing of the present invention;

fig. 2 is a schematic structural view of a bearing outer ring in the BLDC motor bearing of the present invention;

fig. 3 is a schematic structural view of the inner race of the BLDC motor bearing of the present invention;

fig. 4 is a schematic structural view of a retainer in the BLDC motor bearing of the present invention;

FIG. 5 is an expanded cross-sectional view taken along section E-E of FIG. 4;

fig. 6 is a schematic structural view of the cover plate in the BLDC motor bearing of the present invention;

fig. 7 is a schematic view of the area division of the inner ring groove or the outer ring groove in the BLDC motor bearing of the present invention;

reference numerals are as follows: 1, bearing inner ring; 101 an inner ring channel; 2 bearing outer ring; 201 outer ring channel; 202 installing a groove; 3 a spherical rolling body; 4, rolling a track; 5 a cage; 501, mounting a sphere in a groove; 5011 a first opening; 5012 a second opening; 5013 a third opening; 5014 a first limiting part; 5015 a second limiting part; 6, covering a plate; 601 a clamping part; 6011 a third plane; 6012 a first arc; 602 a cover plate body; 6021 a first plane; 6022 a second plane; 6023 a first inclined surface; 6024 first folding edge.

Detailed Description

The following detailed description of the embodiments of the present invention is made with reference to the accompanying drawings and examples. The following examples are intended to illustrate the invention, but are not intended to limit the scope of the invention.

As shown in fig. 1 to 7, a BLDC motor bearing includes a bearing inner ring 1, a bearing outer ring 2, and a plurality of spherical rolling elements 3, wherein the bearing outer ring 2 is disposed outside the bearing inner ring 1, the spherical rolling elements 3 are connected between the bearing outer ring 2 and the bearing inner ring 1 in a rolling manner, an outer ring channel 201 is disposed around the bearing outer ring 2 toward an inner peripheral wall of the bearing inner ring 1, and an inner ring channel 101 corresponding to the outer ring channel 201 is disposed around the bearing inner ring 1 toward an outer peripheral wall of the bearing outer ring 2; the outer ring channel 201 and the inner ring channel 101 cooperate to form a rolling track 4 for the spherical rolling elements 3 to roll;

the diameter of the spherical rolling body 3 is 2.778mm;

the flange coefficient of the bearing outer ring 2 is 0.32, and the flange coefficient of the bearing inner ring 1 is 0.296.

As shown in fig. 2, the flange coefficient of the bearing outer ring 2 can be understood as: the ratio of the difference between the diameter phi 2 of the circle where the lowest part of the outer ring channel 201 is located and the inner diameter phi 1 of the bearing outer ring 2 to the diameter of the spherical rolling body 3; the lowest point of the outer ring channel 201 can be understood as: in the recess depth direction of the outer ring channel 201, the outer ring channel 201 is located farthest from the inner circumferential wall of the bearing outer ring 2.

As shown in fig. 3, the flange coefficient of the bearing inner ring 1 can be understood as: the ratio of the diameter of the spherical rolling body 3 to the difference between the outer diameter phi 3 of the bearing outer ring 2 and the diameter phi 4 of the circle where the lowest part of the inner ring channel 101 is located; the lowest point of the inner ring channel 101 can be understood as: along the depth direction of the recess of the inner ring channel 101, the inner ring channel 101 is farthest from the outer peripheral wall of the bearing inner ring 1.

As shown in fig. 7, regions 0 and 7 are groove edge regions of the inner ring channel 101 and the outer ring channel 201, regions 1, 2, 5 and 6 are groove waist region regions of the inner ring channel 101 and the outer ring channel 201, and regions 3 and 4 are groove bottom regions of the inner ring channel 101 and the outer ring channel 201.

By adopting the structure, compared with the existing BLDC motor bearing, the flange coefficient of the bearing outer ring 2, the flange coefficient of the bearing inner ring 1 and the diameter of the spherical rolling body 3 are adjusted, so that when the BLDC motor bearing runs, the spherical rolling body 3 moves at the groove bottom and the groove waist of the outer ring channel 201 and the inner ring channel 101, and the spherical rolling body 3 is prevented from running at the groove edges of the outer ring channel 201 and the inner ring channel 101;

the roughness of the groove edges of the outer ring channel 201 and the inner ring channel 101 during grinding and channel superfinishing is relative to the difference between the groove bottoms and the groove waist parts of the outer ring channel 201 and the inner ring channel 101, so that the structure can effectively reduce the noise of the BLDC motor bearing during operation, improve the rated static load of the BLDC bearing, bear larger equivalent load and prolong the service life of the BLDC bearing.

Further, the axial play of the BLDC motor bearing is 0.01mm.

The axial play can be understood as: when the bearing inner ring 1 or the bearing inner ring 1 is fixed, the other one moves relative to the bearing inner ring from one extreme position to the other extreme position along the axial direction.

Further, 7 spherical rolling elements 3 are provided.

Further, be provided with the holder 5 on the circumferencial direction between bearing inner race 1 and the bearing outer race 2, the holder 5 along its week upwards be provided with ball mounting groove 501 of ball 3 assorted, just the quantity of ball mounting groove 501 with ball 3 quantity phase-match, ball mounting groove 501 orientation the both sides of bearing inner race 1 and bearing outer race 2 are run through the holder 5 is in order to form first opening 5011 and second opening 5012 respectively.

With the above structure, the spherical rolling elements 3 are mounted in the ball mounting groove 501 and are respectively in rolling engagement with the inner race groove 101 of the bearing inner race 1 and the outer race groove 201 of the bearing outer race 2 through the first opening 5011 and the second opening 5012;

the retainer 5 is arranged to space the plurality of ball rolling elements 3 apart from each other, so that the ball rolling elements 3 are prevented from colliding with each other and rubbing against each other when the BLDC motor bearing is in operation.

Further, a plurality of the ball mounting grooves 501 are provided at equal intervals along the circumference of the cage 5.

With the structure, the ball mounting groove 501 is arranged along the circumferential equal distance of the retainer 5, namely, a plurality of the ball rolling bodies 3 are arranged along the circumferential equal distance of the retainer 5, so that the load is evenly distributed, and the BLDC motor bearing runs more stably.

Further, the ball mounting groove 501 is provided with a third opening 5013 at one side in the axial direction of the cage 5, both ends of the third opening 5013 are formed with a first stopper portion 5014 and a second stopper portion 5015 in a protruding manner, respectively, the first stopper portion 5014 and the second stopper portion 5015 extend obliquely toward the axial side of the third opening 5013 to restrict the spherical rolling elements 3 located in the ball mounting groove 501, and the first stopper portion 5014 and the second stopper portion 5015 are deformable in the axial direction away from the third opening 5013.

With the above-described structure, the spherical rolling elements 3 are fitted into the ball mounting groove 501 through the third openings 5013 or taken out from the ball mounting groove 501; during the mounting process, the spherical rolling elements 3 are in contact with the first and second stopper portions 5014 and 5015 and the first and second stopper portions 5014 and 5015 are deformed in the direction away from the axis of the third opening 5013 to allow the spherical rolling elements 3 to enter the ball mounting groove 501, and at this time, the first and second stopper portions 5014 and 5015 are restored in the direction toward the axis of the third opening 5013 to retain the spherical rolling elements 3 in the ball mounting groove 501, preventing the spherical rolling elements 3 from coming out of the ball mounting groove 501; in the taking out process, the spherical rolling elements 3 are brought into contact with the first and second stopper portions 5014 and 5015, and the first and second stopper portions 5014 and 5015 are deformed in the direction away from the axis of the third opening 5013 so that the spherical rolling elements 3 are taken out from the ball mounting groove 501, and after the spherical rolling elements 3 are taken out from the ball mounting groove 501, the first and second stopper portions 5014 and 5015 are restored to their original state in the direction toward the axis of the third opening 5013.

Specifically, the retainer 5 is made of nylon.

Further, the BLDC motor bearing includes cover plates 6 disposed at both sides of the rolling rail 4 to prevent foreign materials from entering the rolling rail 4.

By adopting the structure, the cover plate 6 can prevent impurities such as dust from entering the rolling track 4 to influence the stability and reliability of the BLDC motor bearing, and the service life of the BLDC motor bearing can be effectively prolonged.

Furthermore, one end of the cover plate 6 is arranged on the bearing outer ring 2, the other end of the cover plate extends towards the bearing inner ring 1, and a gap exists between one end of the cover plate 6 extending towards the bearing inner ring 1 and the bearing inner ring 1.

By adopting the structure, because the bearing inner ring 1 and the bearing outer ring 2 rotate relatively, one end of the cover plate 6 is arranged on the bearing outer ring 2 to realize the fixation of the bearing outer ring, the other end of the cover plate 6 extends towards the bearing outer ring 2 to prevent sundries from entering the rolling track 4, and a gap is formed between the cover plate 6 and the bearing inner ring 1 to prevent the cover plate 6 from influencing the movement of the bearing inner ring 1 relative to the bearing outer ring 2.

Furthermore, the position of the bearing outer ring 2 where the cover plate 6 is installed is recessed inwards to form an installation groove 202, and a clamping portion 601 matched and clamped with the installation groove 202 is arranged at one end of the cover plate 6, which is used for being connected with the bearing outer ring 2; specifically, the clamping portion 601 is formed by flanging one end of the cover plate 6 connected with the bearing outer ring 2.

Further, the cover plate 6 includes a cover plate body 602 and a snap-in portion 601 provided at one end of the cover plate body 602 for connecting with the bearing outer ring 2, the cover plate body 602 includes a first flat surface 6021 having one end connected with the snap-in portion 601, the other end of the first flat surface 6021 is connected with one end of a first inclined surface 6023, the other end of the first inclined surface 6023 extends obliquely away from the rolling rail 4 and is connected with one end of a second flat surface 6022, the other end of the second flat surface 6022 is bent toward the rolling rail 4 to form a first folded edge 6024, and the first flat surface 6021 is parallel to the second flat surface 6022;

the clamping part 601 comprises a third plane 6011 with one end connected with the first plane 6021, an included angle is arranged between the third plane 6011 and the first plane 6021, and the first plane 6021 is in arc transition connection with the third plane 6011; a first arc 6012 is disposed at the other end of the third plane 6011, a central angle of the first arc 6012 is 180 degrees, and specifically, the third plane 6011 is perpendicular to the first plane 6021.

By adopting the structure, the cover plate 6 is not easy to fall off from the bearing outer ring 2.

Further, the curvature coefficient of the outer race channel 201 is 0.56, and the curvature coefficient of the inner race channel 101 is 0.5.

The curvature coefficient of the outer ring channel 201 can be understood as: the ratio of the radius of the outer race channel 201 to the diameter of the spherical rolling elements 3;

the curvature coefficient of the inner ring channel 101 can be understood as: the ratio of the radius of the inner race channel 101 to the diameter of the spherical rolling elements 3;

with the adoption of the structure, the curvature coefficient of the outer ring channel 201 and the curvature coefficient of the inner ring channel 101 are selected, so that the spherical rolling bodies 3 further move at the groove bottoms and the groove waist parts of the outer ring channel 201 and the inner ring channel 101, and the spherical rolling bodies 3 are prevented from running at the groove edges of the outer ring channel 201 and the inner ring channel 101.

The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of improvements and decorations can be made without departing from the technical principle of the present invention, and these improvements and decorations should also be regarded as the protection scope of the present invention.

Claims (10)

1. A BLDC motor bearing, comprising: the bearing comprises a bearing inner ring (1), a bearing outer ring (2) and a plurality of spherical rolling bodies (3), wherein the bearing outer ring (2) is arranged on the outer side of the bearing inner ring (1), the spherical rolling bodies (3) are connected between the bearing outer ring (2) and the bearing inner ring (1) in a rolling manner, an outer ring channel (201) is arranged on the inner peripheral wall of the bearing outer ring (2) facing the bearing inner ring (1) in a surrounding manner, and an inner ring channel (101) corresponding to the outer ring channel (201) is arranged on the outer peripheral wall of the bearing inner ring (1) facing the bearing outer ring (2) in a surrounding manner; the outer ring channel (201) and the inner ring channel (101) are matched to form a rolling track (4) for the spherical rolling bodies (3) to roll;

the diameter of the spherical rolling body (3) is 2.778mm;

the flange coefficient of the bearing outer ring (2) is 0.32, and the flange coefficient of the bearing inner ring (1) is 0.296.

2. The BLDC motor bearing of claim 1, wherein: the number of the spherical rolling bodies (3) is 7.

3. The BLDC motor bearing of claim 1, wherein: be provided with holder (5) on the circumferencial direction between bearing inner race (1) and bearing outer ring (2), holder (5) along its circumference be provided with ball rolling element (3) assorted spheroid mounting groove (501), just the quantity of spheroid mounting groove (501) with ball rolling element (3) quantity phase-match, spheroid mounting groove (501) orientation the both sides of bearing inner race (1) and bearing outer ring (2) are run through holder (5) are in order to form first opening (5011) and second opening (5012) respectively.

4. A BLDC motor bearing according to claim 3, characterised in that: the ball mounting grooves (501) are arranged at equal intervals along the circumferential direction of the retainer (5).

5. The BLDC motor bearing of claim 3, wherein: ball mounting groove (501) is in one side on the axial direction of holder (5) is provided with third opening (5013), the both ends of third opening (5013) are protruding respectively and are formed first spacing portion (5014) and second spacing portion (5015), first spacing portion (5014) and second spacing portion (5015) to third opening (5013) axis side slope extend with the position in order to be located ball rolling element (3) is spacing in ball mounting groove (501), just first spacing portion (5014) and second spacing portion (5015) can be along keeping away from third opening (5013) axis direction deformation.

6. The BLDC motor bearing of claim 1, wherein: the BLDC motor bearing comprises cover plates (6) which are arranged on two sides of the rolling rail (4) to prevent sundries from entering the rolling rail (4).

7. The BLDC motor bearing of claim 6, wherein: one end of the cover plate (6) is arranged on the bearing outer ring (2), the other end of the cover plate extends towards the bearing inner ring (1), and a gap exists between one end, extending towards the bearing inner ring (1), of the cover plate (6) and the bearing inner ring (1).

8. The BLDC motor bearing of claim 7, wherein: bearing inner race (2) installation apron (6) department is inwards sunken to form mounting groove (202), apron (6) be used for with the one end that bearing inner race (2) are connected be provided with mounting groove (202) phase-match joint's joint portion (601).

9. The BLDC motor bearing of claim 6, wherein: the cover plate (6) comprises a cover plate body (602) and a clamping part (601) arranged at one end of the cover plate body (602) and used for being connected with the bearing outer ring (2), the cover plate body (602) comprises a first plane (6021) with one end connected with the clamping part (601), the other end of the first plane (6021) is connected with one end of a first inclined plane (6023), the other end of the first inclined plane (6023) extends obliquely towards the side far away from the rolling track (4) and is connected with one end of a second plane (6022), the other end of the second plane (6022) is bent towards the rolling track (4) to form a first flange (6024), and the first plane (6021) is parallel to the second plane (6022);

the clamping portion (601) comprises a third plane (6011) with one end connected with the first plane (6021), an included angle is formed between the third plane (6011) and the first plane (6021), and the first plane (6021) is in arc transition connection with the third plane (6011); the other end of the third plane (6011) is provided with a first arc (6012), and the central angle of the first arc (6012) is 180 degrees.

10. The BLDC motor bearing of claim 1, wherein: the curvature coefficient of the outer ring channel (201) is 0.56, and the curvature coefficient of the inner ring channel (101) is 0.5.

Images