Combined oil seal

Abstract

The utility model discloses a combined type oil seal, which belongs to the field of bearing oil seals and comprises an outer oil seal, the outer oil seal is of an annular structure, an extrusion convex surface is arranged on the outer curved surface of the outer oil seal, the extrusion convex surface abuts against the inner wall of an outer ring of a bearing, the section of the outer oil seal is L-shaped, and a limiting part is arranged on the inner side of the outer oil seal. An annular inner ring cavity is formed between the limiting part and the outer oil seal, two C-shaped extrusion rings are symmetrically placed in the inner ring cavity, the annular limiting part is arranged on the inner side edge of the oil seal so that an annular cavity can be formed between the annular limiting part and an oil seal body, and the two C-shaped extrusion rings are arranged in the cavity. The two C-shaped extrusion rings can be controlled to move outwards, and outward expansion force is applied to the oil seal through the C-shaped extrusion rings, so that the matching tightness of the oil seal and a bearing steel ball is improved, and looseness is prevented.

Description

TECHNICAL FIELD

[0001] The utility model relates to bearing oil seal field, more specifically, relate to a combined oil seal. BACKGROUND

[0002] Bearing oil seal is a kind of mechanical element for sealing bearing part, it plays an important role in preventing lubricating oil leakage, preventing external impurities from entering bearing and keeping good lubrication and working environment inside bearing etc., bearing oil seal is installed between the inner and outer rings of bearing, and is contacted with bearing steel ring through inclined lip, to still ensure sealing when bearing inner ring rotates, prevent lubricating leakage.The installation of traditional oil seal can only be realized by the cooperation of rubber deformation and bearing steel ring inner groove, and the installation strength is limited, and the phenomenon of looseness is prone to occur when using. SUMMARY

[0003] 1. Technical problem to be solved

[0004] In view of the problems in the prior art, the purpose of the utility model is to provide a combined oil seal, which can realize the outward extrusion force applied to the bearing oil seal to ensure the stability of the bearing installation.

[0005] 2. Technical scheme

[0006] To solve the above problems, the utility model adopts the following technical scheme.

[0007] A combined oil seal, comprising an outer oil seal, the outer oil seal is annular structure, the outer oil seal outer curved surface is provided with extrusion convex surface, the extrusion convex surface is abutted in the inner wall of bearing outer ring, the outer oil seal cross section is L type, the inner side of the outer oil seal is provided with a limiting portion, the limiting portion and the outer oil seal form annular inner ring cavity, two C type extrusion rings are placed symmetrically inside the inner ring cavity.

[0008] Further, two screw rods are symmetrically penetrated on the surface of the outer oil seal, the screw rod is placed between the two C type extrusion rings, the end of the screw rod is provided with a inner hexagonal screw head, and the inner hexagonal screw head is flush with the front surface of the outer oil seal.

[0009] Further, the end of the two C type extrusion rings is hingedly connected with a connecting plate.

[0010] Further, a moving block is screwed on the surface of the screw rod, a fixed bolt is arranged on one side surface of the moving block, and the end of the two connecting plates away from the C type extrusion ring is hingedly connected with the fixed bolt.

[0011] Further, a metal bone plate is embedded in the inner part of the outer oil seal, and the cross section of the metal bone plate is L type.

[0012] Furthermore, a first lip is provided on the inner side surface of the outer oil seal, and a second lip is provided on the inner ring surface of the outer oil seal.

[0013] 3. Beneficial effects

[0014] Compared with the prior art, the advantages of the present invention are: the present invention provides a combined oil seal, an annular limiting portion is provided on the inner side of the oil seal to form an annular cavity between it and the oil seal body, and two C-shaped extrusion rings are provided inside the cavity. When the oil seal and the bearing are installed in place, the two C-shaped extrusion rings can be controlled to move outward, and an outward expansion force can be applied to the oil seal through the C-shaped extrusion ring to improve the tightness of its fit with the bearing steel ball and prevent loosening. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic diagram of the three-dimensional structure of the oil seal of the utility model;

[0016] Figure 2 This is a schematic diagram of the cross-sectional structure of the oil seal of the present utility model;

[0017] Figure 3 For the utility model Figure 2 Schematic diagram of the enlarged structure of area A;

[0018] Figure 4 This is a schematic diagram of the C-type extrusion ring connection structure of the utility model.

[0019] Explanation of the numbers in the figure: 1. External oil seal; 2. Metal bone plate; 3. Limiting part; 4. First lip; 5. Second lip; 6. Inner ring cavity; 7. C-type extrusion ring; 8. Screw; 81. Hexagon socket screw head; 9. Connecting plate; 10. Moving block; 11. Extrusion convex surface; 12. Fixing bolt. DETAILED DESCRIPTION

[0020] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention; it is obvious that the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0021] Example:

[0022] See also Figure 1-Figure 3As shown, a combined oil seal includes an outer oil seal 1, which has an annular structure. The outer curved surface of the outer oil seal 1 is provided with an extrusion convex surface 11, and the inner wall of the bearing outer steel ring is provided with a groove corresponding to the extrusion convex surface 11, so as to improve the stability of the oil seal installation through the concave-convex matching structure. The cross-section of the outer oil seal 1 is L-shaped, and a limiting portion 3 is provided on the inner side of the outer oil seal 1. The limiting portion 3 and the L-shaped outer oil seal 1 form an inwardly open U-shaped structure, and an annular inner ring cavity 6 is formed between the limiting portion 3 and the outer oil seal 1. Two C-shaped extrusion rings 7 are symmetrically placed inside the inner ring cavity 6. The two C-shaped extrusion rings 7 are supported by metal steel sheets and can be deformed to a certain extent.

[0023] Please refer to Figure 2 and Figure 4 As shown, two screws 8 are symmetrically passed through the surface of the outer oil seal 1. The screw 8 is placed between two C-shaped extrusion rings 7. The distance between the two C-shaped extrusion rings 7 is small to increase the expansion area of ​​the outer oil seal 1. The end of the screw 8 is provided with an inner hexagonal screw head 81, which is convenient for control by an external hexagonal wrench. The inner hexagonal screw head 81 is flush with the front surface of the outer oil seal 1 to prevent the protrusion from affecting the use of the bearing.

[0024] Among them, the ends of the two C-type extrusion rings 7 are hinged with connecting plates 9, and a moving block 10 is screwed on the surface of the screw 8. A fixing bolt 12 is provided on one side surface of the moving block 10. The ends of the two connecting plates 9 on the same side facing away from the C-type extrusion ring 7 are hinged on the fixing bolt 12. The screwing of the screw 8 can control the moving block 10 to move along the axis of the screw 8 to adjust the distance, and then control the inclination structure of the two connecting plates 9 to push and expand the two C-type extrusion rings 7, and squeeze the contact force between the convex surface 11 and the outer ring of the bearing to improve the installation strength of the entire oil seal.

[0025] Please refer to Figure 2 and Figure 3 As shown, a metal bone plate 2 is embedded in the outer oil seal 1 , and the cross section of the metal bone plate 2 is L-shaped to improve the overall strength of the outer oil seal 1 .

[0026] Among them, a first lip 4 is provided on the inner side surface of the outer oil seal 1, and a second lip 5 is provided on the inner ring surface of the outer oil seal 1. The first lip 4 and the second lip 5 both abut against the outer curved surface of the inner steel ring of the bearing to ensure that the inner ring of the bearing rotates while maintaining the seal.

[0027] Working principle: Place the outer oil seal 1 between the inner and outer rings of the bearing and allow it to enter the interior of the bearing. The first lip 4 and the second lip 5 are in contact with the inner ring of the bearing, and the inner hexagonal screw head 81 is in contact with the inner surface of the outer ring of the bearing to maintain the seal. The metal bone plate 2 embedded inside can improve the overall strength. During installation, keep the side of the outer oil seal 1 flush with the side of the bearing, and then rotate the inner hexagonal screw head 81 separately to drive the screw 8 to rotate, and then drive the moving block 10 to move along the axis of the screw 8. When the screw 8 moves, the two connecting plates 9 can drive the two C-type extrusion rings 7 to separate. Due to the limitation of the inner ring cavity 6, the C-type extrusion ring 7 can only move inside the inner ring cavity 6. The separation of the two C-type extrusion rings 7 can support the outer oil seal 1, and then increase the extrusion force between the extrusion convex surface 11 and the inner ring surface of the bearing outer steel ring, so as to improve the strength of the entire bearing installation.

[0028] The above description is merely a preferred embodiment of the present invention; however, the scope of protection of the present invention is not limited thereto. Any person skilled in the art who, within the technical scope disclosed in the present invention, makes equivalent substitutions or modifications based on the technical solutions and improved concepts of the present invention shall be covered by the scope of protection of the present invention.

Claims

1. A combined oil seal, comprising an outer oil seal (1), characterized in that: The outer oil seal (1) is an annular structure. The outer curved surface of the outer oil seal (1) is provided with an extrusion convex surface (11). The extrusion convex surface (11) abuts against the inner wall of the bearing outer ring. The cross section of the outer oil seal (1) is L-shaped. A limiting portion (3) is provided on the inner side of the outer oil seal (1). An annular inner ring cavity (6) is formed between the limiting portion (3) and the outer oil seal (1). Two C-shaped extrusion rings (7) are symmetrically placed inside the inner ring cavity (6).

2. A combined oil seal according to claim 1, characterized in that: Two screws (8) are symmetrically passed through the surface of the outer oil seal (1). The screws (8) are placed between the two C-shaped extrusion rings (7). The ends of the screws (8) are provided with inner hexagonal screw heads (81), and the inner hexagonal screw heads (81) are flush with the front surface of the outer oil seal (1).

3. A combined oil seal according to claim 2, characterized in that: The ends of the two C-shaped extrusion rings (7) are both hinged with connecting plates (9).

4. A combined oil seal according to claim 3, characterized in that: A moving block (10) is screwed onto the surface of the screw (8), and a fixing bolt (12) is provided on one side of the moving block (10). The ends of the two connecting plates (9) on the same side facing away from the C-shaped extrusion ring (7) are both hinged on the fixing bolt (12).

5. The combined oil seal according to claim 1, characterized in that: A metal bone plate (2) is embedded in the outer oil seal (1), and the cross section of the metal bone plate (2) is L-shaped.

6. The combined oil seal according to claim 1, characterized in that: A first lip (4) is provided on the inner side surface of the outer oil seal (1), and a second lip (5) is provided on the inner ring surface of the outer oil seal (1).

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