Long-acting conductive box type sealing ring

Abstract

The long-acting conductive box type sealing ring comprises an outer framework, an inner framework and conductive rubber, the conductive rubber is installed on the outer side face of the outer framework, and the upper side face of the outer framework is used for being in interference fit with a tooth opening of a bearing outer ring; the conductive rubber comprises a main lip, the main lip comprises a lip waist part and a lip tip part, the lip waist part is wider than the lip tip part, the section of the main lip is conical, the lip tip part abuts against the upper side face of the inner framework, and the lower side face of the inner framework is used for being in interference fit with an inner ring of the bearing. According to the long-acting conductive box type sealing ring provided by the utility model, the box type sealing ring has a long-acting conductive function, and electric corrosion in a bearing is effectively avoided.

Description

Technical Field

[0001] This utility model relates to the field of sealing ring technology, and more specifically, to a long-lasting conductive box-type sealing ring. Background Technology

[0002] Box-type seals are widely used in railway bearings. When locomotives and rolling stock are running on electrified railways, in the absence of a grounding device or with poor grounding, there is a momentary voltage between the inner and outer rings of the bearing. This can easily cause current to flow directly through the bearing. When the voltage is high enough, bearings using traditional box-type seals will break down. The breakdown current will burn the grease and raceway, leading to bearing failure and affecting transportation safety.

[0003] The main lip of the conductive rubber must be a contact type. However, after the seal rotates for a period of time, the lip will inevitably wear down, resulting in a smaller interference fit. Eventually, the end face of the main lip and the inner skeleton will become a quasi-contact type, greatly reducing the contact area, drastically increasing the contact resistance, and reducing the sealing conductivity.

[0004] Therefore, it is necessary to solve the above-mentioned technical problems. Utility Model Content

[0005] In view of this, the purpose of this utility model is to propose a long-lasting conductive box-type sealing ring, so that the box-type sealing ring has a long-lasting conductive function and effectively avoids electrolytic corrosion inside the bearing.

[0006] To achieve the above objectives, this utility model provides a long-lasting conductive box-type sealing ring, comprising an outer skeleton, an inner skeleton, and conductive rubber, wherein: the conductive rubber is installed on the outer side of the outer skeleton, and the upper side of the outer skeleton is used for interference fit with the outer ring thread of the bearing; the conductive rubber includes a main lip, the main lip including a lip waist and a lip tip, the width of the lip waist being greater than the width of the lip tip, the cross-section of the main lip being tapered, the lip tip abutting against the upper side of the inner skeleton, and the lower side of the inner skeleton being used for interference fit with the inner ring of the bearing.

[0007] Optionally, the lip tip includes an abutting surface, on which multiple arc surfaces and multiple groove surfaces are provided, with the multiple arc surfaces and multiple groove surfaces arranged sequentially at intervals.

[0008] Optionally, a conductive patch is provided on the contact surface, and the conductive patch is adapted to be attached to the plurality of arc surfaces and the plurality of groove surfaces.

[0009] Optionally, the conductive patch is made of polytetrafluoroethylene.

[0010] Optionally, the conductive patch is bonded to multiple arc surfaces and multiple groove surfaces via a vulcanization process.

[0011] This utility model provides a long-lasting conductive box-type sealing ring, comprising an outer skeleton, an inner skeleton, and conductive rubber. First, the conductive rubber is installed on the outer side of the outer skeleton. Then, the tip of the tapered main lip abuts against the upper side of the inner skeleton. Finally, the lower side of the inner skeleton is interference-fitted with the inner ring of the bearing, and the upper side of the outer skeleton is interference-fitted with the thread of the outer ring of the bearing. Because the waist of the tapered main lip is thicker, the waist is less prone to deformation and can adapt to larger radial runout. When the bearing is subjected to accidental impact, the conductive rubber is less likely to be torn. Furthermore, the thinner tip of the lip reduces the radial force of the main lip, thus reducing the frictional torque of the main lip and decreasing the contact resistance between the main lip and the inner skeleton. This gives the box-type sealing ring a long-lasting conductive function, effectively preventing electrolytic corrosion inside the bearing. Attached Figure Description

[0012] The preferred embodiments of this utility model will be described in detail below with reference to the accompanying drawings, which will help to understand the purpose and advantages of this utility model, wherein:

[0013] Figure 1 This is a schematic diagram of the structure of a long-lasting conductive box-type sealing ring according to an embodiment of the present invention;

[0014] Figure 2 This is a partial schematic diagram of a long-lasting conductive box-type sealing ring according to an embodiment of the present invention.

[0015] Explanation of reference numerals in the attached figures:

[0016] 1: Outer skeleton; 2: Inner skeleton; 3: Conductive rubber; 4: Main lip; 5: Lip waist; 6: Lip tip; 7: Rounded surface; 8: Groove surface; 9: Conductive patch. Detailed Implementation

[0017] The present invention will now be described in detail with reference to the embodiments. Identical components are indicated by the same reference numerals. It should be noted that the terms "front," "rear," "left," "right," "up," and "down" used in the following description refer to directions in the accompanying drawings, while the terms "inner" and "outer" refer to directions toward or away from the geometric center of a specific component, respectively.

[0018] like Figure 1 and Figure 2 As shown, the long-lasting conductive box-type sealing ring provided by this utility model includes an outer skeleton 1, an inner skeleton 2, and conductive rubber 3. The conductive rubber 3 is installed on the outer side of the outer skeleton 1, and the upper side of the outer skeleton 1 is used for interference fit with the outer ring of the bearing. The conductive rubber 3 includes a main lip 4, which includes a lip waist 5 and a lip tip 6. The width of the lip waist 5 is greater than the width of the lip tip 6. The cross-section of the main lip 4 is conical. The lip tip 6 abuts against the upper side of the inner skeleton 2, and the lower side of the inner skeleton 2 is used for interference fit with the inner ring of the bearing.

[0019] It should be noted that the cone-shaped main lip 4 has a thicker waist 5 and a thinner tip 6.

[0020] The long-lasting conductive box-type seal ring provided by this utility model includes an outer skeleton 1, an inner skeleton 2, and conductive rubber 3. First, the conductive rubber 3 is installed on the outer side of the outer skeleton 1. Then, the lip tip 6 on the conical main lip 4 abuts against the upper side of the inner skeleton 2. Finally, the lower side of the inner skeleton 2 is interference-fitted with the inner ring of the bearing, and the upper side of the outer skeleton 1 is interference-fitted with the thread of the outer ring of the bearing. Because the lip waist 5 of the conical main lip 4 is relatively thick, the lip waist 5 is not easily deformed and can adapt to large radial runout. When the bearing is subjected to accidental impact, the conductive rubber 3 is not easily torn. Moreover, the lip tip 6 is relatively thin, which can reduce the radial force of the main lip 4. In this way, the frictional torque of the main lip 4 will also be reduced, and the contact resistance between the main lip 4 and the inner skeleton 2 will be reduced. Thus, the box-type seal ring has a long-lasting conductive function, effectively preventing electrolytic corrosion inside the bearing.

[0021] like Figure 1 and Figure 2 As shown, the lip tip 6 includes an abutment surface, on which multiple arc surfaces 7 and multiple groove surfaces 8 are provided, arranged sequentially at intervals. In this embodiment, the multiple arc surfaces 7 and multiple groove surfaces 8 facilitate the deformation of the lip tip 6 when it abuts against the inner skeleton 2. The easy deformation of the lip tip 6 helps the main lip 4 maintain a long-lasting clamping force, thereby making the entire main lip 4 and the inner skeleton 2 present a surface contact in the axial direction. This results in low contact resistance, which is beneficial for sealing and conductivity. The large interference fit between the main lip 4 and the inner skeleton 2 ensures a large clamping force of the main lip 4. The clamping force is applied to these outer arc surfaces 7. The strong contact pressure on the arc surfaces 7 results in low contact resistance, which is beneficial for sealing and conductivity, and improves the long-term conductivity of the box-type sealing ring. At the same time, a small amount of grease can be stored in the multiple grooves to lubricate the main lip 4 and reduce friction, which helps to extend the service life of the main lip 4 and improves the service life of the long-term conductive box-type sealing ring.

[0022] like Figure 1 and Figure 2 As shown, a conductive patch 9 is provided on the contact surface, and the conductive patch 9 is adapted to be attached to multiple arc surfaces 7 and multiple groove surfaces 8. In this embodiment, the conductive patch 9 can effectively reduce the friction of the main lip 4, thereby enabling the main lip 4 to maintain a long-term contact state with the inner skeleton 2, that is, to maintain conductivity for a long time.

[0023] In one embodiment of this invention, the conductive patch 9 is made of polytetrafluoroethylene (PTFE). PTFE is relatively wear-resistant, which increases the service life of the conductive patch 9, thereby increasing the service life of the long-lasting conductive box-type sealing ring.

[0024] In one embodiment of this utility model, the conductive patch 9 is bonded to multiple arc surfaces 7 and multiple groove surfaces 8 through a vulcanization process. The polytetrafluoroethylene conductive patch is bonded together with the conductive rubber 3 through a vulcanization process, thereby giving the two a higher interface bonding strength and further increasing the service life of the long-lasting conductive box-type sealing ring.

[0025] In one embodiment of this invention, the outer skeleton 1 can be phosphated and impregnated with rubber first, and then vulcanized together with the conductive rubber 3. This allows the current introduced from the outer ring of the bearing to be conducted first through the conductive rubber 3 and the inner skeleton 2, and then flow from the inner skeleton 2 to the inner ring of the bearing that it contacts, thus preventing the current from passing through the bearing raceway. This effectively avoids electrolytic corrosion inside the bearing and protects the bearing. Figure 1 The direction of the middle arrow indicates the direction of the current.

[0026] The long-lasting conductive box-type seal ring provided by this utility model includes an outer skeleton 1, an inner skeleton 2, and conductive rubber 3. First, the conductive rubber 3 is installed on the outer side of the outer skeleton 1. Then, the lip tip 6 on the conical main lip 4 abuts against the upper side of the inner skeleton 2. Finally, the lower side of the inner skeleton 2 is interference-fitted with the inner ring of the bearing, and the upper side of the outer skeleton 1 is interference-fitted with the thread of the outer ring of the bearing. Because the lip waist 5 of the conical main lip 4 is relatively thick, the lip waist 5 is not easily deformed and can adapt to large radial runout. When the bearing is subjected to accidental impact, the conductive rubber 3 is not easily torn. Moreover, the lip tip 6 is relatively thin, which can reduce the radial force of the main lip 4. In this way, the frictional torque of the main lip 4 will also be reduced, and the contact resistance between the main lip 4 and the inner skeleton 2 will be reduced. Thus, the box-type seal ring has a long-lasting conductive function, effectively preventing electrolytic corrosion inside the bearing.

[0027] It should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. A long-lasting conductive box-type sealing ring, characterized in that, Includes an outer skeleton, an inner skeleton, and conductive rubber, wherein: The conductive rubber is installed on the outer side of the outer frame, and the upper side of the outer frame is used for interference fit with the outer ring of the bearing. The conductive rubber includes a main lip, which includes a lip waist and a lip tip. The width of the lip waist is greater than the width of the lip tip. The main lip has a tapered cross-section. The lip tip abuts against the upper side of the inner skeleton. The lower side of the inner skeleton is used for interference fit with the inner ring of the bearing.

2. The long-lasting conductive box-type sealing ring according to claim 1, characterized in that, The lip tip includes an abutting surface, on which multiple arc surfaces and multiple groove surfaces are provided, with the multiple arc surfaces and multiple groove surfaces arranged sequentially at intervals.

3. The long-lasting conductive box-type sealing ring according to claim 2, characterized in that, A conductive patch is provided on the contact surface, and the conductive patch is adapted to be attached to multiple arc surfaces and multiple groove surfaces.

4. The long-lasting conductive box-type sealing ring according to claim 3, characterized in that, The conductive patch is made of polytetrafluoroethylene.

5. The long-lasting conductive box-type sealing ring according to claim 4, characterized in that, The conductive patch is bonded to multiple arc surfaces and multiple groove surfaces through a vulcanization process.

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