CN112815011A

CN112815011A - Bearing sealing structure

Info

Publication number: CN112815011A
Application number: CN202011625378.2A
Authority: CN
Inventors: 陈庆熙; 王冰; 赵荣多; 陈太平; 刘双喜
Original assignee: Tcb Bearing Manufacturing Co ltd
Current assignee: Tcb Bearing Manufacturing Co ltd
Priority date: 2017-06-30
Filing date: 2017-06-30
Publication date: 2021-05-18
Also published as: CN107152461A

Abstract

This application is a divisional application with application number 201710523058.8. The embodiment of the invention discloses a bearing sealing structure, which at least comprises an outer ring, an inner ring and a row of steel balls, wherein the steel balls are positioned between the inner surface of the outer ring and the outer surface of the inner ring, the right end surface of the bearing is sequentially provided with a first sealing ring and a retaining ring from inside to outside, the retaining ring and the first sealing ring are both arranged between the inner surface of the outer ring and the outer surface of the inner ring, the first sealing ring comprises a first base part and a first head part, the first base part, the retaining ring, the outer surface of the inner ring and the inner surface of the outer ring surround to form a cavity, the first head part at least comprises a first outer lip, a first middle lip and a first inner lip, and the first outer lip, the first middle lip and the first inner lip are used for partitioning the cavity into at least a first. According to the embodiment of the invention, the sealing performance of the bearing is greatly improved, and the service life of the bearing is prolonged.

Description

Bearing sealing structure

The application is a divisional application, the application number of the original application is 201710523058.8, the application date is 2017, 06 and 30, and the invention name is 'nonstandard four-point contact ball bearing'.

The technical field is as follows:

the invention relates to the technical field of bearing sealing, in particular to a three-lip bearing sealing structure.

Background art:

the bearing is a precision mechanical part and is widely applied to various mechanical equipment. The sealed bearing is provided with a sealed structure and has certain dustproof and waterproof functions. The bearing is pre-filled with a certain amount of lubricating grease before leaving the factory, and the supplementary lubrication is not needed in the service life. The existing sealing bearing can meet the requirements of general industrial application, but for severe application working conditions such as mud, dust, broken stone and the like, the bearing is often out of work early due to the fact that grease overflows or water enters and dust enters, and the sealing structure is damaged, so that the operation and use of a host machine are influenced.

The invention content is as follows:

the invention provides a three-lip bearing sealing structure with good sealing effect and strong working condition adaptability, aiming at solving the problems that the existing bearing sealing working condition is narrow in applicability, and the bearing is damaged early due to the fact that grease overflows or water and dust enter frequently during operation, and the operation and use of a main machine are influenced.

The bearing sealing structure comprises at least an outer ring, an inner ring and a row of steel balls, wherein the steel balls are located between the inner surface of the outer ring and the outer surface of the inner ring, a first sealing ring and a retaining ring are sequentially arranged on the right end face of the bearing from inside to outside, the retaining ring and the first sealing ring are arranged between the inner surface of the outer ring and the outer surface of the inner ring, the first sealing ring comprises a first base part and a first head part, the first base part, the retaining ring and the outer surface of the inner ring and the inner surface of the outer ring surround to form a cavity channel, the first head part at least comprises a first outer lip, a first middle lip and a first inner lip, and the first outer lip, the first middle lip and the first inner lip are used for partitioning the cavity channel into at least a.

According to the embodiment of the invention, the first sealing ring comprising the first base part and the first head part is provided, the first head part adopts a three-lip sealing structure comprising the first outer lip, the first middle lip and the first inner lip, so that the bearing sequentially forms a multi-layer dustproof structure comprising the check ring, the first closed cavity and the second closed cavity from outside to inside, and as the first closed cavity and the second closed cavity are both independent structures with good sealing performance, external dust has a probability of entering the bearing only when entering the first closed cavity and the second closed cavity in sequence, the sealing performance of the bearing is greatly improved, and the service life of the bearing is prolonged.

Description of the drawings:

in order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

FIG. 1 is a structural schematic diagram of a cross section of a bearing seal structure of an embodiment of the invention;

FIG. 2 is a schematic view of the upper enlarged view of FIG. 1 with the first header hidden;

FIG. 3 is a structural schematic diagram of a cross section of a first seal ring;

fig. 4 is a structural diagram of a cross section of the second seal ring.

The specific implementation mode is as follows:

in order to make the technical problems, technical solutions and advantageous effects solved by the present invention more clearly apparent, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

When embodiments of the present invention refer to the ordinal numbers "first", "second", etc., it should be understood that the words are used for distinguishing between them unless the context clearly dictates otherwise.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified 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; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

As shown in fig. 1 to 4, an embodiment of the present invention provides a bearing sealing structure, where the bearing at least includes an outer ring 1, an inner ring 2, and a row of steel balls 3, where the steel balls 3 are located between an inner surface of the outer ring 1 and an outer surface of the inner ring 2, a first sealing ring 4 and a retainer ring 5 are sequentially arranged on a right end surface of the bearing from inside to outside, a second sealing ring 6 is further arranged on a left end surface of the bearing, the retainer ring 5, the first sealing ring 4, and the second sealing ring 6 are all arranged between the inner surface of the outer ring 1 and the outer surface of the inner ring 2, the first sealing ring 4 includes a first base portion 41 and a first head portion 42, the first base portion 41, the retainer ring 5, the outer surface of the inner ring 2, and the inner surface of the outer ring 1 surround to form a cavity channel 7, the first head portion 42 includes at least a first outer lip 421, a first middle lip 422, and a, The first middle lip 422 and the first inner lip 423 are used for separating the cavity 7 into at least a first closed cavity 71 and a second closed cavity 72.

In this embodiment, the cavity 7 is a main passage through which external dust enters the inside of the bearing, and the first outer lip 421, the first middle lip 422 and the first inner lip 423 are arranged in the cavity 7 to partition the cavity 7 into at least a first sealed cavity 71 and a second sealed cavity 72, so that the dustproof sealing performance of the bearing is improved.

As a specific embodiment, but not limiting, the first outer lip 421 and the first middle lip 422 are tightly abutted against the inner wall surface of the retaining ring 5, and the first inner lip 423 is tightly abutted against the outer surface of the inner ring 2. The ends of the first outer lip 421 and the first middle lip 422 are radially outward along the bearing direction, so that dust can slide down to the root parts of the first outer lip 421 and the first middle lip 422 under the action of gravity and be stopped by the root parts when contacting the first outer lip 421 and the first middle lip 422, and further dust infiltration into the bearing is avoided.

The retainer ring 5 includes a coupling portion 51 and a standing wall 52, the coupling portion 51 is in close contact with the outer surface of the inner ring 2, and the inner wall surface of the retainer ring 5 is located on the standing wall 52. In the embodiment, the combining portion 51 is arranged along the axial direction of the bearing, and since the combining portion 51 is in close contact with the outer surface of the inner ring 2, the probability of dust entering the bearing from the combining portion 51 is reduced, and meanwhile, the vertical wall 52 extends from the outer surface close to the inner ring 2 to the outer ring 1, and the vertical wall 52 and the inner surface of the outer ring 1 form a tiny opening, so that the cavity channel 7 is in a roundabout structure as a whole, and the probability of dust entering the bearing is further reduced.

Illustratively, in the present embodiment, the standing wall 52, the first outer lip 421 and the first middle lip 422 surround to form the first sealed cavity 71, and the standing wall 52, the outer surface of the inner ring 2, the first middle lip 422 and the first inner lip 423 surround to form the second sealed cavity 72.

An annular clamping groove 21 is formed in the outer surface of the inner ring 2 in the circumferential direction of the bearing, and a clamping block 511 for extending into the clamping groove 21 is formed at a position of the combining portion 51 corresponding to the clamping groove 21. Through setting up draw-in groove 21 at the surface of inner circle 2 to set up the fixture block 511 that stretches into draw-in groove 21 in the corresponding position of joint portion 51, thoroughly avoided the possibility that the dust got into the bearing by joint portion 51 on the one hand, on the other hand is owing to fixture block 511 and draw-in groove 21's mating reaction, more does benefit to retaining ring 5's overall positioning, has strengthened retaining ring 5 and inner circle 2's joint strength, reduces the risk that the retaining ring pine takes off.

As a specific embodiment, but not limiting, the second sealing ring 6 includes a second base 61 and a second head 62, the second head 62 includes at least a second inner lip 621 and a second outer lip 622, and the second inner lip 621 and the second outer lip 622 tightly abut against the outer surface of the inner ring 2, so that the second inner lip 621, the second outer lip 622 and the outer surface of the inner ring 2 surround to form a third sealed cavity 8. The third closed cavity 8 can effectively prevent dust at the rear part of the steel ball 3 from entering the bearing, and the sealing performance of the bearing is comprehensively guaranteed.

The outer surface of the inner ring 2 is provided with a first protruding ring 22 and a first groove 23 adjacent to the first protruding ring 22, the second outer lip 622 tightly contacts with the first protruding ring 22, and the second inner lip 621 tightly contacts with the inner side of the first groove 23. The first convex ring 22 plays a certain role in stopping dust, and in addition, the first groove 23 is accommodated in the third closed cavity 8 due to the structure, and the third closed cavity 8 with the polygonal cross section has better dust-proof performance compared with a plane structure.

The inner surface of the outer ring 1 is formed with a second groove 11 and a third groove 12, the second base portion 61 is fixed to the second groove 11, and the first base portion 41 is fixed to the third groove 12. In this embodiment, the first base 41 has a "P" shaped base, specifically, the "P" shaped base is fixed to the third groove 12, and the straight edge of the "P" shaped base is in close contact with the side wall surface of the second groove 11 or the third groove 12.

As a preferred embodiment, the second outer lip 622, the second base 61 and the outer surface of the inner ring 2 surround to form a fourth sealed cavity (not shown in the drawings). The end of the second base 61 may extend to form a sealing baffle (not shown in the drawings), the sealing baffle is close to the outer surface of the inner ring 2 to form the fourth sealed cavity, and the fourth sealed cavity is located outside the third sealed cavity 8, so that the dustproof sealing performance of the bearing can be further enhanced.

As a specific embodiment and not limitation, the first head 42 is inserted into the end of the first base 41, and the second head 62 is attached to the inner wall surface of the second base 61. The first base portion 41, the second base portion 61 and the retainer ring 5 are made of steel, and the first head portion 42, the second head portion 62 and the seal retainer are made of nitrile rubber.

The embodiment of the invention provides the first sealing ring comprising the first base part and the first head part, the first head part adopts a three-lip sealing structure comprising the first outer lip, the first middle lip and the first inner lip, so that the bearing sequentially forms a multi-layer dustproof structure comprising the check ring, the first closed cavity and the second closed cavity from outside to inside, and because the first closed cavity and the second closed cavity are independent structures with good sealing performance, external dust has a probability of entering the bearing only when sequentially entering the first closed cavity and the second closed cavity, the sealing performance of the sealing structure of the bearing is greatly improved, and the service life of the sealing bearing is prolonged.

The foregoing is illustrative of one or more embodiments provided in connection with the detailed description and is not intended to limit the practice of the invention to the particular forms disclosed. If the first head part is not limited to a three-lip structure, the first head part can also be a four-lip or five-lip structure; the first outer lip, the first middle lip and the first inner lip are not limited to partition the cavity into a first closed cavity and a second closed cavity, and can partition more closed cavities and the like. Similar or identical methods, structures and the like as those of the present invention or several technical deductions or substitutions made on the premise of the conception of the present invention should be considered as the protection scope of the present invention.

Claims

1. The utility model provides a bearing seal structure, the bearing includes the outer lane at least, the inner circle, and a row of steel ball, the steel ball is located between the internal surface of outer lane and the surface of inner circle, bearing right-hand member face is equipped with first sealing washer and retaining ring from inside to outside in proper order, the retaining ring, first sealing washer is all located between the internal surface of outer lane and the surface of inner circle, a serial communication port, first sealing washer includes first basal portion and first head, first basal portion, the retaining ring, the surface of inner circle and the internal surface of outer lane surround and form the chamber way, first head includes first outer lip at least, first well lip and first inner lip, first outer lip, first well lip and first inner lip are used for cutting off the chamber way and are first airtight cavity and the airtight cavity of second at least.

2. The bearing seal structure according to claim 1, wherein at least the first outer lip abuts closely against an inner wall surface of the retainer ring, at least the first inner lip abuts closely against an outer surface of the inner ring, and the first middle lip abuts against the inner wall surface of the retainer ring or the outer surface of the inner ring.

3. The bearing seal structure according to claim 2, wherein the retainer ring includes a joint portion and a standing wall, the joint portion being in close contact with an outer surface of the inner race, an inner wall surface of the retainer ring being located on the standing wall.

4. The bearing seal structure according to any one of claims 1 to 3, wherein an annular notch is formed in an outer surface of the inner ring in a circumferential direction of the bearing, and a stopper extending into the notch is formed at a position of the joint portion corresponding to the notch.

5. The bearing seal structure according to claim 4, wherein a third groove is formed on the inner surface of the outer ring at a position closer to the right side, and the first base is fixed to the third groove.

6. The bearing seal structure of claim 5, wherein the first head is inserted through an end of the first base.

7. The bearing seal structure of claim 6, wherein the left end face of the bearing is further provided with a second seal ring between the inner surface of the outer ring and the outer surface of the inner ring, the second seal ring comprises a second base portion and a second head portion, the second head portion at least comprises a second inner lip and a second outer lip, and the second inner lip and the second outer lip are tightly abutted against the outer surface of the inner ring, so that the second inner lip, the second outer lip and the outer surface of the inner ring surround to form a third sealed cavity.

8. The bearing seal structure according to claim 7, wherein the inner ring has an outer surface provided with a first projecting ring and a first groove adjacent to the first projecting ring, the second outer lip closely abutting against the first projecting ring, and the second inner lip closely abutting against an inner side edge of the first groove.

9. The bearing seal structure of claim 8, wherein the first base portion, the second base portion, and the retainer ring are made of steel, and the first head portion and the second head portion are made of nitrile rubber.