Labyrinth sealing type axle box bearing for urban rail train

Abstract

The utility model discloses a labyrinth sealed axle box bearing for urban rail trains, which comprises an outer ring, a first inner ring and a second inner ring, the first inner ring and the second inner ring are arranged side by side, and rolling bodies are respectively arranged between the first inner ring and the outer ring and between the second inner ring and the outer ring. The edge positions of the first inner ring and the second inner ring are respectively provided with a positioning step, the positioning steps are connected with a first framework, the first framework is bent to form a limiting groove, the edge of the outer ring is provided with a blocking lip, the blocking lip comprises a connecting part and a shielding part, the connecting part is connected with the outer ring, and the shielding part is connected with the outer ring. One end of the shielding part is connected with the connecting part, and the other end is in clearance fit with the limiting groove. The bearing is simple in structure and has good sealing and waterproof effects, and the use reliability of the bearing is effectively improved.

Description

Technical Field

[0001] The utility model relates to a labyrinth sealed axle box bearing for an urban rail train. Background Art

[0002] With the development of urban rail trains, axle box bearings, as important components of urban rail trains, are in urgent need of localization. With the advancement of processing technology, the quality of domestic axle box bearings is also getting higher and higher. However, there are still the following problems with domestic axle box bearings: the existing axle box bearings generate a lot of heat at high speeds, which increases the operating temperature, the overall precision is not high, the sealing structure and processing capability are poor, and non-contact sealing dust prevention is used, resulting in weak waterproof ability, which is the key to limiting the high-speed performance of the bearings. As a result, the existing bearings must be returned to the factory for repair when the mileage reaches 1.2 million kilometers, and the repair cost is high and time-consuming. Utility Model Content

[0003] In view of the deficiencies in the prior art, the utility model provides a labyrinth sealed axle box bearing for urban rail trains, which has a simple structure, good sealing and waterproofing effects, and effectively improves the reliability of the bearing.

[0004] To achieve the above-mentioned purpose, the utility model provides a labyrinth-sealed axle box bearing for an urban rail train, comprising an outer ring, a first inner ring and a second inner ring, the first inner ring and the second inner ring being arranged side by side, rolling bodies being respectively arranged between the first inner ring and the outer ring and between the second inner ring and the outer ring, the first inner ring and the second inner ring being respectively provided with positioning steps at the edge positions, the positioning steps being connected to a first frame, the first frame being bent to form a limiting groove, a retaining lip being provided at the edge of the outer ring, the retaining lip comprising a connecting portion and a shielding portion, the connecting portion being connected to the outer ring, one end of the shielding portion being connected to the connecting portion, and the other end being clearance-matched with the limiting groove.

[0005] The beneficial effect of such arrangement is that, through the cooperation of the limit groove and the retaining lip, a non-contact labyrinth seal is formed, no friction is generated in the sealing system, and it has good waterproof and dustproof effects. At the same time, it has a simple structure, a smooth operation process, and good reliability in use.

[0006] As a further configuration of the utility model, a plurality of second frames are arranged at intervals on the barrier lip, and the second frames include a positioning portion and a bending portion connected to each other, the positioning portion is embedded in the connecting portion, the bending portion is attached to the shielding portion, and a cutting groove is arranged on the shielding portion corresponding to the edge of the bending portion of the second frame.

[0007] The beneficial effect of such a setting is: through such a setting, such a skeleton structure, the second skeleton here adopts a memory alloy. When the bearing is running, the temperature rises. When the temperature reaches 40°C, that is, a "transformation temperature" or transition temperature of the nickel-titanium memory alloy, when this specific transition temperature changes up and down, the second skeleton will show contraction or expansion, thereby realizing a change in shape. At this temperature, the bending portion of the second skeleton will slightly deform toward the outside of the bearing, so that the cutting groove position exposes a gap, thereby promoting the heat dissipation of the overall bearing structure and reducing the temperature rise of the structure. At the same time, the structure is simple, easy to implement, and has a good use effect.

[0008] As a further configuration of the utility model, a connecting groove is provided at the edge of the outer ring corresponding to the position of the retaining lip, and the connecting portion is clamped in the connecting groove.

[0009] The beneficial effect of such arrangement is that the positioning effect of the retaining lip is ensured, loosening is avoided, and the stability of the structural operation is ensured.

[0010] As a further configuration of the utility model, a grease injection hole is provided on the outer ring, and a sealing bolt is matched on the grease injection hole.

[0011] The beneficial effect of such arrangement is that, through such arrangement, online filling of grease can be realized, and the service life can be extended. At the same time, the structure is simple, the operation is convenient, and the use effect is good. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a schematic diagram of the structure of an embodiment of the utility model;

[0013] Figure 2 For the utility model embodiment Figure 1 A partial enlarged view of the middle part;

[0014] Figure 3 It is a cross-sectional view of the retaining lip in the embodiment of the utility model. DETAILED DESCRIPTION

[0015] The utility model is used for the labyrinth sealed axle box bearing of urban rail trains. Figures 1 to 3As shown: it includes an outer ring 1, a first inner ring 21 and a second inner ring 22, the first inner ring 21 and the second inner ring 22 are arranged side by side, rolling bodies 3 are respectively arranged between the first inner ring 21 and the outer ring 1 and between the second inner ring 22 and the outer ring 1, the first inner ring 21 and the second inner ring 22 are respectively provided with positioning steps at the edge positions, the positioning steps are connected with a first skeleton 5, the first skeleton 5 is bent to form a limiting groove, the edge of the outer ring 1 is provided with a retaining lip 4, the retaining lip 4 includes a connecting portion 41 and a shielding portion 42, the connecting portion 41 is connected to the outer ring 1, one end of the shielding portion 42 is connected to the connecting portion 41, and the other end is matched with the limiting groove gap. The beneficial effect of such arrangement is that such arrangement forms a non-contact labyrinth seal through the cooperation of the limiting groove and the retaining lip 4, no friction is generated in the sealing system, and it has a good waterproof and dustproof effect, and at the same time, the structure is simple, the operation process is smooth, and it has good reliability in use.

[0016] As a further configuration of this embodiment, a plurality of second skeletons 6 are arranged at intervals on the barrier lip 4, and the second skeleton 6 includes a positioning portion 61 and a bending portion 62 connected to each other, the positioning portion 61 is embedded in the connecting portion 41, the bending portion 62 is attached to the shielding portion 42, and a cutting groove is arranged on the shielding portion 42 corresponding to the edge of the bending portion 62 of the second skeleton 6. The beneficial effect of such a configuration is that through such a configuration, such a skeleton structure, the second skeleton 6 here adopts a memory alloy, when the bearing is running, due to the increase in temperature, when the temperature reaches 40°C, that is, a "transformation temperature" or transition temperature of the nickel-titanium memory alloy, when the temperature changes up and down at this specific transition temperature, the second skeleton 6 will show contraction or expansion, thereby realizing a change in shape, at this temperature, the bending portion 62 of the second skeleton 6 will slightly deform toward the outside of the bearing, so that the position of the cutting groove exposes a gap, thereby promoting the heat dissipation of the overall bearing structure, reducing the temperature rise of the structure, and at the same time, the structure is simple, easy to implement, and has a good use effect.

[0017] As a further configuration of this embodiment, a connection groove 11 is provided at the edge of the outer ring 1 corresponding to the position of the retaining lip 4, and the connection portion 41 is clamped in the connection groove 11. The beneficial effect of this configuration is that the positioning effect of the retaining lip 4 is ensured, loosening is avoided, and the stability of the structural operation is ensured.

[0018] As a further configuration of this embodiment, a grease injection hole 12 is provided on the outer ring 1, and a sealing bolt is provided on the grease injection hole 12. The beneficial effect of this configuration is that the grease can be filled online, the service life can be extended, and the structure is simple, the operation is convenient, and the use effect is good.

[0019] The above example is only one preferred specific example of the present invention. The common changes and substitutions made by those skilled in the art within the technical solution of the present invention are all included in the protection scope of the present invention.

Claims

1. A labyrinth sealed axle box bearing for an urban rail train, comprising an outer ring, a first inner ring and a second inner ring, wherein the first inner ring and the second inner ring are arranged side by side, and rolling bodies are respectively arranged between the first inner ring and the outer ring and between the second inner ring and the outer ring, wherein: The first inner ring and the second inner ring are respectively provided with positioning steps at the edge positions, the positioning steps are connected with a first frame, the first frame is bent to form a limiting groove, a stop lip is provided at the edge of the outer ring, the stop lip includes a connecting portion and a shielding portion, the connecting portion is connected to the outer ring, one end of the shielding portion is connected to the connecting portion, and the other end is clearance-matched with the limiting groove.

2. The labyrinth sealed axle box bearing for urban rail trains according to claim 1, characterized in that: A plurality of second frames are arranged at intervals on the barrier lip, and the second frames include a positioning portion and a bending portion connected to each other, the positioning portion is embedded in the connecting portion, the bending portion is attached to the shielding portion, and a cutting groove is arranged on the shielding portion corresponding to the edge of the bending portion of the second frame.

3. The labyrinth sealed axle box bearing for urban rail train according to claim 1, characterized in that: A connecting groove is arranged at the edge of the outer ring corresponding to the position of the retaining lip, and the connecting portion is clamped in the connecting groove.

4. The labyrinth sealed axle box bearing for urban rail trains according to claim 1, 2 or 3, characterized in that: The outer ring is provided with a grease injection hole, and the grease injection hole is matched with a sealing bolt.

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