CN105545961B

CN105545961B - Low-noise deep groove ball bearing

Info

Publication number: CN105545961B
Application number: CN201510626493.4A
Authority: CN
Inventors: 周明海; 黄列; 郑长根; 陆镇桥; 卢利军; 黄玉仁; 徐群慧
Original assignee: NINGBO WANFENG BEARING CO Ltd
Current assignee: NINGBO WANFENG BEARING CO Ltd
Priority date: 2015-09-24
Filing date: 2015-09-24
Publication date: 2020-05-29
Anticipated expiration: 2035-09-24
Also published as: CN105545961A

Abstract

The invention provides a low-noise deep groove ball bearing, wherein a cavity between a bearing outer ring and a bearing inner ring is distributed with a bearing retainer (6) which is formed by buckling two parts, the bearing retainer (6) adopts a tenon and groove combination mode at the combination position between bearing balls (3), the bearing retainer (6) is axially arranged between the bearing outer ring (1) and the bearing inner ring (2), two side parts of a spherical cavity are formed into two annular grooves (6.2, 6.4), and openings of the two grooves are opened towards a bearing ball raceway and are diverged.

Description

Low-noise deep groove ball bearing

Technical Field

The invention relates to a deep groove ball bearing, in particular to a low-noise deep groove ball bearing.

Background

Deep groove ball bearings are the most common rolling bearings, are suitable for high speed operation, and are durable and maintenance free. The deep groove ball bearing is generally required to have small friction coefficient, high limit rotating speed and low manufacturing cost. The size and the shape of the motor are various, and the motor is suitable for industries such as precision instruments, low-noise motors, automobiles and the like.

The deep groove ball bearing is composed of an inner bearing ring, an outer bearing ring and a plurality of bearing balls arranged between the bearing rings, the bearing balls are arranged in groove-shaped roller paths in the inner surfaces of the inner bearing ring and the outer bearing ring, and the deep groove ball bearing is difficult to be fully lubricated due to the fact that the annular roller paths of the inner ring and the outer ring of the deep groove ball bearing are closed with the balls. The sealing rings are arranged at two ends or one end of the bearing to prevent the grease filled in advance from leaking, but the bearing can be filled once when being delivered from a factory, and has the defects of solidification and agglomeration of the grease, difficulty in replacement and the like after being used for a long time.

Meanwhile, the bearing needs to adopt the sealing cover due to the sealing requirement, but the sealing cover is not reliably riveted due to the heat treatment deformation of the outer ring tooth socket, and the cover falling phenomenon often occurs in the bearing moving process. As in german patent DE4214655a1, providing a sealing cap on a deep groove ball bearing and then overlapping the inner and outer bearing rings results in an increase in the volume of the circumferential cavity, but the sealing cap is prone to wear in use, so that grease leakage occurs.

In addition, the single-row deep groove ball bearing is a rigid radial rolling bearing, the radial axial bearing capacity is required to be the same, and the friction is small, so that the bearing can bear high rotating speed. As in DE168499a1, the two bearing rings are arranged eccentrically to one another and are filled with balls. However, the bearing capacity is limited due to the small bearing balls.

As in japanese patent publication 2002-. However, when the circumferential width of the bearing inner groove is large, the center position of the retainer is largely displaced, and the retainer may be abnormally vibrated during the operation of the bearing, thereby causing interference between the cavity of the retainer and the bearing ball and noise between the retainer and the retainer.

At present, the requirements for noise, life and bearing of the bearings used in the motors are higher and higher, so that research on the structure of the bearings is needed to provide a low-noise deep groove ball bearing.

Disclosure of Invention

In order to overcome the defects in the prior art, the invention aims to provide a low-noise deep groove ball bearing, so that the bearing has the advantages of good silencing effect, easiness in manufacturing, higher bearing capacity and long service life.

The invention provides a low-noise deep groove ball bearing, which comprises a bearing outer ring and a bearing inner ring which is coaxially arranged in the bearing outer ring with the bearing outer ring, wherein a plurality of bearing balls are arranged between the bearing outer ring and the bearing inner ring, and the bearing balls roll in an outer ring raceway on the inner surface of the bearing outer ring and an outer ring raceway on the outer surface of the bearing inner ring; the inner chamber between bearing inner race and the bearing inner race is sealed by two annular seal ring that set up face to face each other axially, fills its characterized in that with bearing lubricant in the inner chamber between bearing inner race and the bearing outer race:

a bearing retainer which is formed by mutually buckling two parts is distributed in a cavity between the bearing outer ring and the bearing inner ring, and the joint position of the bearing retainer between bearing balls adopts a tenon and groove joint mode;

the half edge of the bearing retainer, which is positioned at one side of the bearing ball, comprises a partially spherical cavity, and the two half edge parts form a spherical cavity for containing and retaining the bearing ball;

the bearing retainer is axially arranged between the bearing outer ring and the bearing inner ring, two side parts of the spherical cavity are formed into two annular grooves, and openings of the two grooves are opened towards the bearing ball raceway and are diverged.

Preferably, each side half of the bearing cage has two circumferential ridges at the locations where the bearing cage contacts the bearing outer race and the bearing inner race.

Further, the invention aims to provide a deep groove ball bearing with low noise, and the bearing has a good dustproof effect, and the dustproof cover is not easy to fall off in the using process.

The annular cross-section of the seal ring has a multilayer structure comprising: the radial sealing edge of the outermost layer is inserted into and fixed on the dustproof cover in the radial sealing edge slot of the sealing ring, and the axial sealing lip is attached to the dustproof cover;

the axial sealing lip is provided with a trapezoidal outline with the tail end protruding towards an inner cavity between the bearing outer ring and the bearing inner ring;

the sealing ring on at least one side is located the bearing inner race alveolus, and outer lane alveolus and sealing ring outer lip axial interference fit exist radial clearance simultaneously between the sealing ring and the bearing inner race of this side, and the bearing inner race of this side has the width that subtracts the thickness of sealing ring in the axial direction than the bearing outer lane.

Preferably, the bearing inner ring has a width on one side of the seal ring, which is smaller than the width of the bearing outer ring by the thickness of the seal ring in the axial direction.

Preferably, the inner surface of the bearing inner ring is in scraping contact with a sealing lip formed at the tail end of the radial sealing edge of the sealing ring, and a circumferential inverted tooth groove is formed on the inner surface of the bearing inner ring and matched with a tooth part and a concave part formed by the sealing lip.

The invention has the following beneficial effects:

1. the half-cage on each side has two circumferential ridges at the locations where the bearing cage contacts the bearing outer race and the bearing inner race. On one hand, the ridge part has a labyrinth sealing effect on a closed space between the bearing outer ring and the bearing inner ring; in the second aspect, the structure provides certain flexibility for the edge of the bearing retainer, so that the bearing retainer is easier to be installed in the bearing inner ring and the bearing outer ring in a matching way; in the third aspect, the bearing inner ring and the bearing outer ring which are arranged in a matched manner are provided with the concave parts, and when the bearing rotates, a discontinuous cloth distribution surface on the centrifugal force is formed, so that the lubricant is difficult to diffuse out easily; in the fourth aspect, the central position of the retainer is limited through the matching action of the ridge part and the concave part, the abnormal vibration of the retainer in the bearing operation process is avoided, and the noise generated by the vibration due to the deviation of the central position of the retainer is obviously reduced.

2. The bearing retainer is in the form of a buckling piece at the joint position between the bearing balls, and preferably adopts the combination form of a tenon and a groove, so that two half sides of the bearing retainer are buckled without arranging other connection modes.

3. The axial sealing lip has a trapezoidal profile with the end projecting into the cavity between the bearing outer race and the bearing inner race, the trapezoidal profile helping to prevent lubricant substances from entering directly into the radial gap existing between the sealing ring and the bearing outer race or the bearing inner race when the bearing rotates.

4. The inner surface of the bearing inner ring is provided with the annular inverted tooth groove, on one hand, the inner surface of the inverted tooth groove and the surface of the tooth protruding part form a chamfer, the contact surface between the sealing lip and the bearing inner ring is reduced, on the other hand, the multi-linear sealing surface is formed, the sealing effect of the sealing ring is improved, meanwhile, the shape of the inverted tooth groove is beneficial to forming a fit with the tooth part and the concave part formed by the sealing lip, and the dust cover is prevented from falling off in operation.

5. The bearing retainer is formed into two annular grooves at two side parts of the spherical cavity, the openings of the two grooves are opened to the bearing ball race and are diverged, the two grooves can be symmetrical or asymmetrical, the annular grooves can be used as extra grooves for storing lubricant, the lubricant is temporarily accumulated and prevented from being diffused outwards the bearing retainer during the operation of the bearing, and the lubricant is further redistributed to the ball race through the diverged openings.

Drawings

FIG. 1 is an enlarged cross-sectional view of a deep groove ball bearing of the present invention.

FIG. 2 is an enlarged cross-sectional view of the outer race of the deep groove ball bearing of the present invention.

FIG. 3 is an enlarged cross-sectional view of the inner race of the deep groove ball bearing of the present invention.

FIG. 4 is an enlarged gasket view of the deep groove ball bearing of the present invention.

FIG. 5 is an enlarged cross-sectional view of the cage of the deep groove ball bearing of the present invention.

FIG. 6 is a partial schematic view of an enlarged cage fastener for a deep groove ball bearing of the present invention.

Detailed Description

The present invention is further illustrated by the following examples, which are not intended to limit the invention to these embodiments. It will be appreciated by those skilled in the art that the present invention encompasses all alternatives, modifications and equivalents as may be included within the scope of the claims.

Example 1

The invention provides a low-noise deep groove ball bearing, which comprises a bearing outer ring 1 and a bearing inner ring 2 coaxially arranged with the bearing outer ring in the bearing outer ring as shown in figure 1, wherein a plurality of bearing balls 3 are arranged between the bearing outer ring 1 and the bearing inner ring 2, and the bearing balls 3 can roll in an outer ring raceway on the inner surface of the bearing outer ring 1 and an outer ring raceway on the outer surface of the bearing inner ring 2.

The inner space between the outer bearing ring 1 and the inner bearing ring 2 of the deep groove ball bearing is sealed by two annular sealing rings 5 arranged axially opposite one another, while the inner space between the outer bearing ring 1 and the inner bearing ring 2 is filled with a bearing lubricant.

As shown in fig. 4, the ring-shaped cross section of the seal ring 5 has a multi-layer structure, including an outermost radial sealing edge 5.4, a dust cap 5.5 inserted and fixed in a slot of the radial sealing edge 5.4 of the seal ring 5, and an axial sealing lip 5.6 attached to the dust cap.

The axial sealing lip has a trapezoidal profile with the ends protruding towards the inner cavity between the bearing outer ring 1 and the bearing inner ring 2, which helps to prevent lubricant substances from entering directly into the radial gap existing between the sealing ring 5 and the bearing outer ring 1 or the bearing inner ring 2 when the bearing is rotating.

As shown in fig. 1 to 4, the seal ring 5 on one side is located in the tooth groove 1.8 of the bearing outer ring 1, the outer ring tooth groove 1.8 is in axial interference fit with the seal ring outer lip 5.1, and a radial gap is present between the seal ring 5 on the one side and the bearing inner ring 2, and the bearing inner ring 2 on the one side has a width of the thickness of the seal ring 5 subtracted in the axial direction from the bearing outer ring 1.

The inner surface of the bearing inner ring 2 keeps scraping contact with a sealing lip 5.8 formed at the tail end of a radial sealing edge 5.4 of the sealing ring 5, a surrounding type inverted tooth groove 2.3 is formed on the inner surface of the bearing inner ring 2, on one hand, a chamfer is formed on the inner surface 2.1 of the inverted tooth groove 2.3 and the surface of a tooth protruding part 2.2, the contact surface of the sealing lip 5.8 and the bearing inner ring 2 is reduced, on the other hand, a multi-linear sealing surface is formed, the sealing effect of the sealing ring is improved, meanwhile, the shape of the inverted tooth groove is beneficial to forming matching with a tooth part 5.3 and a concave part 5.7 formed by the sealing lip 5.8, and the dust cap is prevented from.

Further preferably, a lubricant storage groove surrounding the circumferential direction can be arranged in the raceways of the bearing outer ring 1 and the bearing inner ring 2 to contain more lubricant and prolong the service life of the bearing.

The opposite sealing ring 5 on the other side is positioned in a tooth groove 2.8 of the bearing inner ring 2, the tooth groove 2.8 of the inner ring is in axial interference fit with an outer lip 5.1 of the sealing ring, meanwhile, a radial gap exists between the sealing ring 5 on the side and the bearing outer ring 1, and the bearing outer ring 1 on the side has a width which is obtained by subtracting the thickness of the sealing ring 5 in the axial direction compared with the bearing inner ring 2.

The outer surface of the bearing outer ring 1 keeps scraping contact with a seal lip 5.8 formed at the tail end of a radial seal edge 5.4 of the seal ring 5, a surrounding type inverted tooth groove 1.3 is formed on the outer surface of the bearing outer ring 1, the shape of the inverted tooth groove is beneficial to forming matching with a tooth part 5.3 and a concave part 5.7 formed by the seal lip 5.8, and the dust cover is prevented from falling off in operation.

The present embodiment describes a manner in which the bearings and the seal rings on both sides are asymmetrically configured, but the present invention does not exclude a manner in which the bearings and the seal rings on both sides are symmetrically configured, that is, the bearings and the seal rings may be configured symmetrically about the center of the bearing ball.

Example 2

Further preferably, a bearing retainer 6 which is formed by mutually buckling two parts is distributed in a cavity between the bearing outer ring 1 and the bearing inner ring 2 of the deep groove ball bearing, so that a plurality of bearing balls 3 are distributed and maintained at uniform intervals in the circumferential direction.

As shown in fig. 5, the half of the bearing cage 6 on the side of the bearing ball 3 includes a partially spherical cavity 6.7, the two half portions are formed as spherical cavities for accommodating and holding the bearing ball, and both side portions of the spherical cavities are formed as two annular grooves 6.2 and 6.4 in the axial direction between the bearing outer race 1 and the bearing inner race 2, the openings of the two grooves are open to and divergent from the bearing ball raceway, the two grooves may be symmetrical or asymmetrical, and the annular groove may serve as an additional groove for storing lubricant, temporarily accumulating the lubricant during the bearing operation and preventing it from being dispersed to the outside of the bearing cage, and further redistributing the lubricant to the ball raceway through the divergent openings.

At the location where the bearing cage 6 is in contact with the bearing inner ring 2 and the bearing outer ring 1, the half-cage on each side has two circumferential ridges 6.1 and 6.3. On one hand, the ridge part generates a labyrinth sealing effect on a closed space between the bearing outer ring 1 and the bearing inner ring 2; in the second aspect, the structure provides certain flexibility for the edge of the bearing retainer, so that the bearing retainer is easier to be installed in the bearing inner ring and the bearing outer ring in a matching way; in the third aspect, when the bearing rotates, the bearing inner ring 2 and the bearing outer ring 1 are matched with the ridge to be installed, and the concave parts 1.5, 1.9 and 2.5, 2.9 on the bearing outer ring 1 form a discontinuous cloth distribution surface on centrifugal force, so that the lubricant is difficult to diffuse out easily; in the fourth aspect, the central position of the retainer is limited through the matching action of the ridge part and the concave part, the abnormal vibration of the retainer in the bearing operation process is avoided, and the noise generated by the vibration due to the deviation of the central position of the retainer is obviously reduced.

Example 3

Further preferably, as shown in fig. 6, the bearing retainer 6 is formed by using a snap-fit component at the joint position between the bearing balls 3, preferably a tongue-and-groove joint, and the two half sides of the bearing retainer are buckled without providing other connection means.

A further preferred tongue and groove is selected in the shape of a hollow truncated cone with a hole and this hole communicates the bearing cage with the central annular spaces 6.5 and 6.6 of the outer side so that the space between the cages is in fluid communication with the space between the outer and inner rings of the bearing.

The cage and the radial sealing edge can be made of plastic materials, such as polyamide 66 and polyhexamethylene amide, which have good wear resistance under high load, small friction coefficient and good aging resistance. But may of course also be made of conventional materials such as steel.

It will be appreciated by persons skilled in the art that the embodiments of the invention described above and shown in the drawings are given by way of example only and are not limiting of the invention. The functional and structural principles of the present invention may be modified at will without departing from the principles set forth above.

Claims

1. A low-noise deep groove ball bearing comprises a bearing outer ring (1), a bearing inner ring (2) coaxially arranged with the bearing outer ring in the bearing outer ring, a plurality of bearing balls (3) arranged between the bearing outer ring (1) and the bearing inner ring (2), and the bearing balls (3) rolling in an outer ring raceway on the inner surface of the bearing outer ring (1) and an outer ring raceway on the outer surface of the bearing inner ring (2); the inner chamber between bearing inner race (2) and bearing outer race (1) is sealed by two ring seal (5) that set up face to face each other axially each other, fills with bearing lubricant in the inner chamber between bearing inner race (2) and bearing outer race (1), sets up around the lubricant storage groove (1.4) of circumference in the outer lane raceway of the internal surface of bearing inner race (1) and the outer lane raceway of the surface of bearing inner race (2), its characterized in that:

a bearing retainer (6) which is formed by buckling two parts is distributed in a cavity between the bearing outer ring (1) and the bearing inner ring (2), and the combination position of the bearing retainer (6) between the bearing balls (3) adopts a combination form of a tenon and a groove;

the half edge of the bearing retainer (6) positioned at one side of the bearing ball (3) comprises a partial spherical cavity (6.7), and the two half edge parts form a spherical cavity for containing and retaining the bearing ball;

the bearing retainer (6) is arranged between the bearing outer ring (1) and the bearing inner ring (2) in the axial direction, two side parts of the spherical cavity are formed into two annular grooves (6.2, 6.4), and the openings of the two grooves are opened towards the bearing ball raceway and are diverged;

at the position where the bearing retainer (6) is contacted with the bearing outer ring (1) and the bearing inner ring (2), the half retainer on each side is provided with two encircling ridges (6.1, 6.3);

corresponding concave parts (1.5, 1.9, 2.5, 2.9) are arranged on the bearing inner ring (2) and the bearing outer ring (1) which are matched with the ridge parts;

the ring-shaped cross-section of the sealing ring (5) has a multilayer structure comprising: the radial sealing edge (5.4) of the outermost layer, a dustproof cover (5.5) inserted and fixed in the slot of the radial sealing edge (5.4) of the sealing ring (5), and an axial sealing lip (5.6) attached to the dustproof cover;

the axial sealing lip (5.6) has a trapezoidal contour with the end protruding towards the inner cavity between the bearing outer ring (1) and the bearing inner ring (2)

The inner surface of the bearing inner ring (2) keeps scraping contact with a sealing lip (5.8) formed at the tail end of a radial sealing edge (5.4) of the sealing ring (5), a surrounding type inverted tooth groove (2.3) is formed on the inner surface of the bearing inner ring (2), and the inner surface of the bearing inner ring is matched with a tooth part (5.3) and a concave part (5.7) formed by the sealing lip (5.8).