Sealing structure for slewing bearing

Abstract

The utility model relates to the technical field of slewing bearing sealing, in particular to a sealing structure for a slewing bearing, which comprises a sealing belt and a sealing strip, the sealing belt and the sealing strip are both arranged between a bearing inner ring and a bearing outer ring, and the sealing belt and the sealing strip are respectively arranged at two ends of the bearing inner ring. The sealing belt is provided with anti-falling inverted teeth, the bearing inner ring is provided with a sealing groove, and the anti-falling inverted teeth and the sealing groove are in interference fit; an outer sealing lip and an inner sealing lip are arranged on the sealing belt, the inner sealing lip is arranged close to the bearing inner ring, and the outer sealing lip and the inner sealing lip tightly press the bearing outer ring in an interference mode. According to the utility model, long-term and efficient sealing protection requirements can be provided for the slewing bearing, various impurities can be effectively prevented from invading the raceway, and meanwhile, lubricating grease in the raceway of the slewing bearing can be better prevented from leaking.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of slewing bearing seal, especially to a sealing structure for slewing bearing. BACKGROUND

[0002] Slewing bearing is a kind of large slewing bearing capable of bearing comprehensive load, and it is an important transmission component necessary for the mechanical that two objects need relative slewing motion and simultaneously bear axial force, radial force and overturning moment.

[0003] Slewing bearing generally includes bearing outer ring, bearing inner ring, rolling body and sealing band, and the rolling body moves in the raceway of bearing outer ring and bearing inner ring. The effective direct relationship of sealing performance of sealing band is the service life of slewing bearing, and better sealing performance can greatly prolong the service life of slewing bearing.

[0004] However, the existing slewing bearing for engineering machinery has poor working environment, and there are a lot of sand, water and other impurities in the environment, which may cause the sealing performance of the sealing band to decrease, the sealing band to fall off due to external objects and oxidation, and even cause the sealing band to lose sealing performance, thereby causing various impurities to invade the raceway of the slewing bearing, causing abnormal wear or corrosion of the raceway of the slewing bearing, and seriously affecting the service life of the slewing bearing. INVENTION CONTENTS

[0005] The utility model provides a sealing structure for slewing bearing in view of the deficiency of prior art, can provide long-term efficient sealing protection requirements for slewing bearing, can effectively prevent various impurities from invading the raceway, and also can better prevent the leakage of grease in the raceway of the slewing bearing.

[0006] The technical scheme for solving the above technical problems is as follows:

[0007] A sealing structure for slewing bearing, comprising a sealing band and a sealing strip, the sealing band and the sealing strip are arranged between the bearing inner ring and the bearing outer ring, and the sealing band and the sealing strip are arranged at both ends of the bearing inner ring, the sealing band is provided with anti-falling teeth, the bearing inner ring is provided with a sealing groove, and the anti-falling teeth are assembled with the sealing groove in interference, the sealing band is provided with an outer sealing lip and an inner sealing lip, the inner sealing lip is arranged close to the bearing inner ring, and the outer sealing lip and the inner sealing lip are interference-pressed against the bearing outer ring.

[0008] By adopting the technical scheme, the anti-falling tooth on the sealing band is interference assembled with the sealing groove of the bearing inner ring, the anti-falling tooth can provide greater anti-falling force to prevent the sealing band from falling out in the later use process; the outer sealing lip and the inner sealing lip are both interference pressed against the bearing outer ring, the outer sealing lip outside plays the first protection to block the invasion of large-particle pollutants and water, the inner sealing lip inside plays the second protection to mainly block the invasion of water to cause rust, corrosion and the like, and prevent the lubricating grease in the bearing from leaking; meanwhile, the outer sealing lip outside is exposed for a long time, and is likely to be oxidized and worn, the sealing performance of the outer sealing lip outside will decrease in long-term use, the inner sealing lip inside has lower oxidation degree and is not likely to be worn outside, and can keep the sealing performance for a long time, the cooperation of the two sealing lips can long-term guarantee the reliability of the sealing.

[0009] Further, the anti-falling tooth is inclined to the side of the bearing inner ring close to the bearing outer ring.

[0010] By adopting the technical scheme, the connection process of the sealing band and the bearing inner ring is easier, and the separation process of the sealing band and the bearing inner ring is more difficult, which is beneficial to improve the smoothness of the connection of the sealing band and the bearing inner ring, and makes the anti-falling tooth on the sealing band not easy to fall out of the sealing groove on the bearing inner ring.

[0011] Further, the anti-falling tooth is provided with multiple turns.

[0012] By adopting the technical scheme, it is further ensured that the anti-falling tooth on the sealing band is not easy to fall out of the sealing groove on the bearing inner ring.

[0013] Further, the outer part of the sealing band is provided with a fixing rope.

[0014] Further, the outer part of the sealing band is provided with a fixing groove, and the fixing rope is fastened in the fixing groove.

[0015] By adopting the technical scheme, the fixing rope is circumferentially fastened in the fixing groove of the sealing band, which further plays a role in preventing the sealing band from falling off, and cooperates with the fixing capacity of the anti-falling tooth to play a double anti-falling capacity.

[0016] Further, the fixing rope is a stainless steel wire rope or a nylon rope.

[0017] Further, one end of the sealing strip is connected with the bearing outer ring, and the other end is abutted with the bearing inner ring.

[0018] Further, the bearing outer ring is provided with a mounting groove, and the one end of the sealing strip connected with the bearing outer ring is embedded in the mounting groove.

[0019] By adopting the technical scheme, one end of the sealing strip is embedded in the mounting groove of the bearing outer ring through compression deformation to realize the connection of the sealing strip and the bearing outer ring.

[0020] Further, the bearing outer ring is provided with a mounting hole, an elastic pin is embedded in the mounting hole, the elastic pin is in interference fit with the mounting hole, and the end of the elastic pin abuts against one end of the sealing strip connected with the bearing outer ring.

[0021] By adopting the technical scheme, the elastic pin can generate an axial force for compression sealing, preventing the sealing strip from being pulled out of the mounting groove.

[0022] Further, the sealing strip gradually thins from the bearing outer ring to the bearing inner ring.

[0023] By adopting the technical scheme, the abutting end (one end abutting against the bearing inner ring) of the sealing strip is deformed under the pressure of the lubricating grease, so that the excess lubricating grease is discharged from the raceway through the sealing strip via the axial oil storage groove.

[0024] In summary, compared with the prior art, the beneficial effects of the technical scheme are:

[0025] (1) The anti-falling teeth on the sealing strip are in interference fit with the sealing groove of the bearing inner ring, so that the design of the anti-falling teeth can provide greater anti-falling force to prevent the sealing strip from falling out in the later use process.

[0026] (2) The utility model innovates the working mode of the traditional sealing strip, modifies the traditional single-lip sealing into a double-lip sealing structure with internal and external compression, and has better sealing performance.

[0027] (3) The sealing strip of the utility model is easy to maintain. The traditional single-lip sealing has poor sealing performance, and the lubricating grease in the raceway can easily leak from the sealing strip position, causing environmental pollution. Users need to constantly supplement the lubricating grease for long-term normal use, increasing the use cost. The sealing strip structure of the utility model can effectively prevent the lubricating grease in the raceway from leaking, and the user does not need to frequently supplement the lubricating grease for the slewing bearing.

[0028] (4) The utility model has a compact structure, can be seamlessly switched without changing the original slewing bearing size, and does not need additional cost.

[0029] (5) The utility model has high anti-falling performance, increases the mechanical binding in the circumferential direction of the fixing rope, and can effectively prevent the sealing strip from falling off.

[0030] (6) The utility model adopts a compression mechanical fixing mode in which the elastic pin in the bearing outer ring directly contacts the sealing strip, preventing the sealing strip from falling off. BRIEF DESCRIPTION OF DRAWINGS

[0031] Figure 1 It is a whole structure schematic view of the utility model.

[0032] Reference signs: 1, sealing band; 2, sealing strip; 3, bearing inner ring; 4, bearing outer ring; 5, anti-falling tooth; 6, sealing groove; 7, outer sealing lip; 8, inner sealing lip; 9, fixing rope; 10, fixing groove; 11, mounting groove; 12, mounting hole; 13, elastic pin. DETAILED DESCRIPTION

[0033] The principles and characteristics of the utility model are described, and the examples are only used to explain the utility model and are not used to limit the scope of the utility model. Figure 1 The principles and characteristics of the utility model are described, and the examples are only used to explain the utility model and are not used to limit the scope of the utility model.

[0034] The utility model embodiment discloses a sealing structure for slewing bearing.

[0035] Reference Figure 1 A sealing structure for slewing bearing, including sealing band 1 and sealing strip 2, sealing band 1 and sealing strip 2 are all arranged between bearing inner ring 3 and bearing outer ring 4, and sealing band 1 is arranged at the lower end of bearing inner ring 3 and bearing outer ring 4 and is used for sealing lower oil storage groove and lower raceway, sealing strip 2 is arranged at the upper end of bearing inner ring 3 and bearing outer ring 4 and is used for sealing upper oil storage groove and upper raceway.

[0036] Sealing band 1 is made of butyronitrile rubber material or other material resistant to aging, wear and deformation, anti-falling tooth 5 is integrally arranged on sealing band 1, sealing groove 6 is arranged on bearing inner ring 3, and anti-falling tooth 5 is assembled with sealing groove 6 in interference, so that anti-falling tooth 5 can provide greater anti-falling force to prevent sealing band 1 from falling out in the later use process.

[0037] Further, anti-falling tooth 5 is arranged on the side of bearing inner ring 3 close to bearing outer ring 4, which is inclined, and is beneficial to improve the smoothness of the connection between sealing band 1 and bearing inner ring 3, and simultaneously makes anti-falling tooth 5 on sealing band 1 not easy to fall out of sealing groove 6 on bearing inner ring 3, anti-falling tooth 5 is arranged in multiple circles, specifically three circles, so as to further ensure that anti-falling tooth 5 on sealing band 1 is not easy to fall out of sealing groove 6 on bearing inner ring 3.

[0038] The outer part of sealing band 1 is provided with a fixing rope 9, and the outer part of sealing band 1 is provided with a fixing groove 10, the fixing rope 9 is fastened in the fixing groove 10, specifically, the fixing rope 9 is circumferentially fastened in the fixing groove 10 of the sealing band 1, which can further prevent the sealing band 1 from falling off, and cooperates with the fixing capacity of the anti-falling tooth 5 to have double anti-falling capacity.

[0039] Further, the fixing rope 9 is a stainless steel wire rope or a nylon rope, and other products with high strength can also be used instead.

[0040] Because the sealing effect of traditional single-lip seal form is poor, foreign matter invasion and lubricating grease leakage cannot be effectively prevented, the utility model discloses a double-lip seal structure of inside and outside pressure, and specifically, the outer sealing lip 7 and the inner sealing lip 8 are integrally arranged on the sealing band 1, and the inner sealing lip 8 is arranged close to the bearing inner ring 3.

[0041] The outer sealing lip 7 and the inner sealing lip 8 are both arranged obliquely away from the bearing inner ring 3 on the side of the bearing outer ring 4, and the outer sealing lip 7 and the inner sealing lip 8 are both pressed tightly on the bearing outer ring 4 in an interference manner. The outer sealing lip 7 on the outside plays the first protection, blocks the invasion of large-particle contaminants and water, the inner sealing lip 8 on the inside plays the second protection, mainly blocks the invasion of water, causes rust, corrosion and the like, and prevents the lubricating grease in the bearing from leaking, and the cooperation of the two sealing lips can ensure the reliability of the sealing for a long time.

[0042] One end of the sealing strip 2 is fixedly connected with the bearing outer ring 4, and the other end is abutted with the bearing inner ring 3, and specifically, the bearing outer ring 4 is provided with a mounting groove 11, and one end of the sealing strip 2 connected with the bearing outer ring 4 is embedded in the mounting groove 11. One end of the sealing strip 2 is embedded in the mounting groove 11 of the bearing outer ring 4 through compression deformation, so that the connection between the sealing strip 2 and the bearing outer ring 4 can be realized.

[0043] The sealing strip 2 gradually thins from the bearing outer ring 4 to the bearing inner ring 3, so that the abutted end (the end abutted with the bearing inner ring 3) of the sealing strip 2 can be deformed under the pressure of the lubricating grease, so that the excess lubricating grease is discharged from the raceway through the sealing strip 2 through the axial oil storage groove.

[0044] The top of the bearing outer ring 4 is provided with a mounting hole 12, the mounting hole 12 is embedded with an elastic pin 13, the elastic pin 13 is in interference fit with the mounting hole 12, the bottom of the elastic pin 13 is abutted with one end of the sealing strip 2 connected with the bearing outer ring 4, so that the elastic pin 13 can generate a compression sealing axial force, realizing the compression mechanical fixing mode of the elastic pin 13 and the sealing strip 2 in direct contact, preventing the sealing strip 2 from being pulled out of the mounting groove 11.

[0045] The implementation principle of the sealing structure for the rotary support is that: first, the anti-falling tooth 5 on the sealing band 1 is interference assembled in the sealing groove 6 of the bearing inner ring 3, so that the outer sealing lip 7 and the inner sealing lip 8 are interference pressed against the bearing outer ring 4, then the fixing rope 9 is circumferentially tightly fixed in the fixing groove 10 of the sealing band 1, so that the fixing, sealing and anti-falling of the sealing band 1 can be realized; first, one end of the sealing strip 2 is embedded in the mounting groove 11 of the bearing outer ring 4 through compression deformation, the other end is abutted against the bearing inner ring 3, then the elastic pin 13 is interference embedded in the mounting hole 12 from the top of the bearing outer ring 4, so that the bottom of the elastic pin 13 is abutted against one end of the sealing strip 2 connected with the bearing outer ring 4, so that the connection of the sealing strip 2 and the bearing outer ring 4, and the sealing and anti-falling of the sealing strip 2 can be realized.

[0046] The above only describes the preferred embodiments of the utility model, and is not used to limit the utility model, and any modification, equivalent replacement, improvement and the like made within the spirit and principle of the utility model should be included in the protection scope of the utility model.

Claims

1. A sealing structure for a slewing bearing, characterized in that: The bearing includes a sealing strip (1) and a sealing bar (2), both of which are located between the inner ring (3) and the outer ring (4) of the bearing, and are located at both ends of the inner ring (3); the sealing strip (1) is provided with anti-disengagement teeth (5), and the inner ring (3) of the bearing is provided with a sealing groove (6), and the anti-disengagement teeth (5) and the sealing groove (6) are press-fitted together; the sealing strip (1) is provided with an outer sealing lip (7) and an inner sealing lip (8), the inner sealing lip (8) is located close to the inner ring (3), and both the outer sealing lip (7) and the inner sealing lip (8) are press-fitted together with the outer ring (4).

2. The sealing structure for a slewing bearing according to claim 1, characterized in that: The anti-detachment tooth (5) is inclined toward the side of the inner ring (3) of the bearing that is close to the outer ring (4).

3. A sealing structure for a slewing bearing according to claim 1 or 2, characterized in that: The anti-detachment teeth (5) have multiple rings.

4. A sealing structure for a slewing bearing according to claim 1, characterized in that: The sealing strip (1) is provided with a fixing rope (9) on the outside.

5. A sealing structure for a slewing bearing according to claim 4, characterized in that: The sealing strip (1) has a fixing groove (10) on its outside, and the fixing rope (9) is fastened in the fixing groove (10).

6. A sealing structure for a slewing bearing according to claim 5, characterized in that: The fixing rope (9) is a stainless steel wire rope or a nylon rope.

7. A sealing structure for a slewing bearing according to claim 1, characterized in that: One end of the sealing strip (2) is connected to the outer ring (4) of the bearing, and the other end abuts against the inner ring (3) of the bearing.

8. A sealing structure for a slewing bearing according to claim 7, characterized in that: The bearing outer ring (4) has an installation groove (11), and the end of the sealing strip (2) connected to the bearing outer ring (4) is embedded in the installation groove (11).

9. A sealing structure for a slewing bearing according to claim 8, characterized in that: The bearing outer ring (4) has a mounting hole (12), and an elastic pin (13) is embedded in the mounting hole (12). The elastic pin (13) is interference-fitted with the mounting hole (12), and the end of the elastic pin (13) abuts against the end of the sealing strip (2) connected to the bearing outer ring (4).

10. A sealing structure for a slewing bearing according to claim 7, characterized in that: The sealing strip (2) gradually becomes thinner from the outer ring (4) of the bearing to the inner ring (3).

Images