Sealing structure for end cover of sliding bearing

Abstract

The sealing structure for the end cover of the sliding bearing comprises the bearing end cover, an annular groove is formed in the inner side wall of the middle of the bearing end cover, an elastic sealing ring is clamped in the annular groove, and a connecting sealing ring is inserted in the elastic sealing ring in a sleeved mode. A plurality of annular oil storage grooves are formed in the inner side wall of the connecting sealing ring; a plurality of arc-shaped limiting parts are formed on the inner side wall of the elastic sealing ring, annular positioning grooves are formed in the front portion and the rear portion of the outer side wall of the connecting sealing ring, and the inner side edge portions of the arc-shaped limiting parts are inserted into the corresponding annular positioning grooves in a sleeved mode. The sealing effect is good, the position of the connecting sealing ring can be adjusted along with the rotating shaft according to the rotating condition of the rotating shaft, the sealing effect is guaranteed, abrasion caused by eccentric rotation is reduced, and the service life is prolonged.

Description

Technical field:

[0001] The utility model relates to the technical field of sliding bearings, and more specifically to a sealing structure for an end cover of a sliding bearing. Background technology:

[0002] Sealing end caps are provided at both ends of the sliding bearing to prevent internal lubricating oil from leaking and external impurities from entering the interior. The commonly used sealing method for sliding bearings is to embed a sealing ring in the sealing groove on the inner wall to seal in this way. However, when in use, the shaft will be in an eccentric position when it rotates, that is, when it rotates, there will be deviations, which will make the compression state between the sealing ring and the shaft inconsistent, and the pressure between the inner wall surface of some sealing rings and the corresponding outer wall of the shaft will be small, while some parts will be too tight. Due to the small deformation range of the sealing ring, the wall surface where the sealing ring presses the shaft is severely worn, so that in the later stage, some inner wall surfaces of the sealing ring cannot be close to the outer wall surface of the shaft, that is, there is a gap between a part of the inner wall surface of the sealing ring and the outer wall surface of the shaft, resulting in oil leakage, and the sealing cannot be achieved, affecting the use effect. Utility model content:

[0003] The purpose of the utility model is to overcome the deficiencies of the prior art and provide a sealing structure for an end cover of a sliding bearing, which has a good sealing effect. Its connecting sealing ring can be adjusted in position along with the rotating shaft according to the rotation of the rotating shaft, thereby ensuring the sealing effect, reducing the wear caused by eccentric rotation, and increasing the service life.

[0004] The solution of the utility model to solve the technical problem is:

[0005] A sealing structure for an end cover of a sliding bearing comprises a bearing end cover, wherein an annular groove is formed on the inner side wall of the middle part of the bearing end cover, an elastic sealing ring is clamped in the annular groove, and a connecting sealing ring is inserted into the elastic sealing ring;

[0006] A plurality of annular oil storage grooves are formed on the inner side wall of the connecting sealing ring;

[0007] A plurality of arc-shaped limiting parts are formed on the inner side wall of the elastic sealing ring, and annular positioning grooves are formed on the front and rear parts of the outer side wall connected to the sealing ring, and the inner side edges of the arc-shaped limiting parts are inserted into the corresponding annular positioning grooves.

[0008] The outer side wall of the elastic sealing ring is pressed against the inner side wall of the annular groove, and radially extending annular wall panels are formed on the inner side walls of the front end and rear end of the elastic sealing ring, and the outer end surface of the annular wall panel is pressed against the front end surface or the rear end surface of the annular groove. An annular raised ring is formed on the front end surface of the connecting sealing ring, and the front end of the annular raised ring is pressed against the rear wall surface of the front annular wall panel. The cross section of the annular raised ring is semicircular, and its arc-shaped wall surface is pressed against the rear wall surface of the front annular wall panel. A plurality of hemispherical convex points are formed on the rear wall surface of the connecting sealing ring, and the spherical surface of the hemispherical convex points is pressed against the front wall surface of the annular wall panel at the rear end.

[0009] The annular raised ring and the hemispherical raised point further improve the axial positioning of the connecting sealing ring.

[0010] The outstanding effects of the utility model are:

[0011] The arc-shaped limiting part cooperates with the annular positioning groove of the connecting sealing ring, thereby realizing the axial positioning of the connecting sealing ring, and the two annular raised rings are pressed against the annular wall plate at the front end to realize sealing. Description of the drawings:

[0012] Figure 1 It is a partial structural schematic diagram of the utility model;

[0013] Figure 2 It is a schematic diagram of the local structure between the elastic sealing ring and the connecting sealing ring of the utility model;

[0014] Figure 3 It is a schematic diagram of the local structure at the front end surface connected to the sealing ring;

[0015] Figure 4 It is a schematic diagram of the local structure at the rear end face connected to the sealing ring. Specific implementation method:

[0016] For example, see Figures 1 to 4 As shown, a sealing structure for an end cover of a sliding bearing comprises a bearing end cover 10, an annular groove 11 is formed on the inner side wall of the middle part of the bearing end cover 10, an elastic sealing ring 20 is clamped in the annular groove 11, and a connecting sealing ring 30 is inserted into the elastic sealing ring 20;

[0017] A plurality of annular oil storage grooves 31 (three annular oil storage grooves 31 in this embodiment) are formed on the inner side wall of the connecting sealing ring 30;

[0018] A plurality of arc-shaped limiting parts 21 are formed on the inner side wall of the elastic sealing ring 20, and the inner side wall of the arc-shaped limiting part 21 is an arc-shaped wall surface. All the arc-shaped limiting parts 21 are evenly distributed on the inner side wall of the elastic density ring 20 with the central axis of the elastic sealing ring 20 as the center. The front and rear parts of the outer side wall of the connecting sealing ring 30 are formed with an annular positioning groove 32, and the inner side edge of the arc-shaped limiting part 21 is inserted into the corresponding annular positioning groove 32. This arc-shaped limiting part 21 can axially position the connecting sealing ring 30 to prevent it from moving forward and backward. However, there is a distance between the inner side wall of the arc-shaped limiting part 21 and the inner side wall surface of the annular positioning groove 32, so that the connecting sealing ring 30 can be radially adjusted.

[0019] Furthermore, the outer wall of the elastic sealing ring 30 is pressed against the inner wall of the annular groove 11, and the inner walls of the front and rear ends of the elastic sealing ring 20 are both formed with radially extending annular wall panels 22. The outer end surface of the annular wall panel 22 is pressed against the front end surface or the rear end surface of the annular groove 11, and an annular raised ring 33 is formed on the front end surface of the connecting sealing ring 30. In this embodiment, two annular raised rings 33 are formed thereon, and the front end surface of the annular raised ring 33 is an arc-shaped wall surface, and the arc-shaped wall surface is pressed against the rear wall surface of the front annular wall panel 22. Since it is an arc-shaped wall surface, its contact with the rear wall surface of the front annular wall panel 22 is actually a line contact, and two annular raised rings 33 are provided to further improve the sealing effect.

[0020] Furthermore, a plurality of hemispherical protrusions 1 are formed on the rear wall surface of the connecting sealing ring 30, and the spherical surface of the hemispherical protrusions 1 is pressed against the front wall surface of the annular wall plate 22 at the rear end, which is point contact. The hemispherical protrusions 1 and the annular raised ring 33 further improve the axial position of the connecting sealing ring 30.

[0021] Furthermore, a radially extending oil return hole 311 is formed in the middle of the annular oil storage groove 31 in the middle of the inner side wall of the connecting sealing ring 30 , and the outer end of the oil return hole 311 extends out of the outer side wall of the connecting density ring 30 .

[0022] At least one annular positioning groove 12 is formed on the inner wall at the front end of the bearing end cover 10, and in the present embodiment, there are two annular positioning grooves 12. The outer edge of the annular first sealing ring 2 is nested in the corresponding annular positioning groove 12, and the side wall of the middle through hole of the first sealing ring 2 is the inner edge, which extends out of the inner wall of the bearing end cover 10. The inner wall of the middle through hole of the first sealing ring 2 is aligned and corresponds to the inner wall of the connecting sealing ring 30 front and back.

[0023] When the present embodiment is in operation, when the shaft rotates, its connecting sealing ring 30 will be offset as the shaft rotates eccentrically to ensure floating seal, and its lubricating oil portion will be in the annular oil storage groove 31 to lubricate the outer wall surface of the shaft to reduce wear, and some excess oil will flow back from the oil return hole 311 to the bearing.

Claims

1. A sealing structure for an end cover of a sliding bearing, comprising a bearing end cover (10), characterized in that: An annular groove (11) is formed on the inner side wall of the middle part of the bearing end cover (10), an elastic sealing ring (20) is clamped in the annular groove (11), and a connecting sealing ring (30) is inserted into the elastic sealing ring (20); A plurality of annular oil storage grooves (31) are formed on the inner side wall of the connecting sealing ring (30); A plurality of arc-shaped limiting portions (21) are formed on the inner side wall of the elastic sealing ring (20), and annular positioning grooves (32) are formed on the front and rear parts of the outer side wall connected to the sealing ring (30), and the inner side edges of the arc-shaped limiting portions (21) are inserted into the corresponding annular positioning grooves (32).

2. The sealing structure for an end cover of a sliding bearing according to claim 1, characterized in that: The outer wall of the elastic sealing ring (20) is pressed against the inner wall of the annular groove (11), and radially extending annular wall plates (22) are formed on the inner walls of the front and rear ends of the elastic sealing ring (20), and the outer end surface of the annular wall plate (22) is pressed against the front end surface or the rear end surface of the annular groove (11). An annular raised ring (33) is formed on the front end surface of the connecting sealing ring (30), and the front end of the annular raised ring (33) is pressed against the rear wall surface of the front annular wall plate (22).

3. The sealing structure for an end cover of a sliding bearing according to claim 2, characterized in that: The front end surface of the annular raised ring (33) is an arc-shaped wall surface, and the arc-shaped wall surface is pressed against the rear wall surface of the front annular wall plate (22).

4. The sealing structure for an end cover of a sliding bearing according to claim 2, characterized in that: A plurality of hemispherical convex points (1) are formed on the rear wall surface of the connecting sealing ring (30), and the spherical surfaces of the hemispherical convex points (1) are pressed against the front wall surface of the annular wall plate (22) at the rear end.

5. The sealing structure for an end cover of a sliding bearing according to claim 1, characterized in that: A radially extending oil return through hole (311) is formed in the middle of the annular oil storage groove (31) in the middle of the inner side wall of the connecting sealing ring (30), and the outer end of the oil return through hole (311) extends out of the outer side wall of the connecting sealing ring (30).

6. The sealing structure for an end cover of a sliding bearing according to claim 1, characterized in that: At least one annular positioning groove (12) is formed on the inner side wall at the front end of the bearing end cover (10); the outer side edge of the annular first sealing ring (2) is nested in the corresponding annular positioning groove (12); the side wall of the middle through hole of the first sealing ring (2) is the inner side edge, which extends out of the inner side wall of the bearing end cover (10); the inner side wall of the middle through hole of the first sealing ring (2) is aligned and corresponds to the inner side wall of the connecting sealing ring (30) in front and back.

7. The sealing structure for an end cover of a sliding bearing according to claim 1, characterized in that: Two annular raised rings (33) are formed on the front end surface of the connecting sealing ring (30).

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