A bearing ventilation and pressure relief device

Abstract

The present invention discloses a bearing ventilation and pressure relief device, which includes a valve body and a sealing ball; the valve body is installed on the outer ring of the bearing, and a pressure relief part, a sealing ball accommodating part and a ventilation part are sequentially arranged in the valve body along the radial direction of the bearing from the outside to the inside of the outer ring of the bearing; a pressure relief groove is provided on the inner wall of the pressure relief part, the sealing ball is placed in the sealing ball accommodating part, and when a certain pressure difference is generated between the inside and outside of the outer ring of the bearing, the sealing ball can move in the sealing ball accommodating part, the ventilation part communicates the inside of the outer ring of the bearing with the sealing ball accommodating part, and the pressure relief part and the ventilation part limit the sealing ball in the sealing ball accommodating part. This device realizes the internal and external pressure balance of the bearing, thereby ensuring the normal operation of the bearing.

Description

Technical Field

[0001] The present invention relates to the technical field of bearing accessories, and particularly relates to a bearing ventilation and pressure relief device. Background Art

[0002] In the vehicle bearings used in the rail transit industry, self-sealing double-row cylindrical and tapered roller bearings have been mass-produced and applied in the vehicle axle box bearings of the rail transit industry. Since the self-sealing bearings generate heat during operation, the air pressure inside the bearings increases, which will affect the sealing form of the rubber seal. When the micro-contact seal is under increased internal pressure, the rubber of the seal structure contacts and rubs against the metal, resulting in an increase in the bearing temperature rise and affecting the application of the bearings. How to ensure that the internal and external pressures of the bearings are the same after the temperature rise during the operation of the bearings is an urgent problem to be solved. Summary of the Invention

[0003] The present invention provides a bearing ventilation and pressure relief device, which solves the problem of different internal and external pressures of the bearings caused by temperature rise.

[0004] The technical means adopted by the present invention are as follows:

[0005] A bearing ventilation and pressure relief device includes a valve body and a sealing ball;

[0006] The valve body is installed on the outer ring of the bearing. Along the radial direction of the bearing from the outside to the inside of the outer ring of the bearing, a pressure relief part, a sealing ball accommodating part, and a ventilation part are sequentially arranged in the valve body;

[0007] A pressure relief groove is arranged on the inner wall of the pressure relief part. The sealing ball is placed in the sealing ball accommodating part, and when there is a certain pressure difference between the inside and outside of the outer ring of the bearing, the sealing ball can move in the sealing ball accommodating part. The ventilation part communicates the inside of the outer ring of the bearing with the sealing ball accommodating part, and the pressure relief part and the ventilation part limit the sealing ball in the sealing ball accommodating part.

[0008] Further, an annular groove is also arranged between the pressure relief part and the sealing ball accommodating part. The inner diameter of the annular groove is larger than the diameter of the sealing ball, and the annular groove communicates with the pressure relief groove.

[0009] Further, the sealing ball is a rubber ball.

[0010] Further, the sealing ball accommodating part is filled with grease.

[0011] Further, the pressure relief part is a regular polygon hole. The diameter of the inscribed circle of the regular polygon hole is smaller than the diameter of the sealing ball, and the diameter of the circumscribed circle is larger than the diameter of the sealing ball.

[0012] Further, the pressure relief part is a regular polygon hole, the diameter of the inscribed circle of the regular polygon hole is smaller than the diameter of the sealing ball, and the diameter of the circumscribed circle is larger than the diameter of the sealing ball. When the sealing ball enters the annular groove from the sealing ball accommodating part, the sealing ball is in line contact with both the edge of the pressure relief part and the edge of the sealing ball accommodating cavity.

[0013] Further, the pressure relief part is a regular hexagon hole.

[0014] Further, the valve body is threadedly connected to the outer ring of the bearing.

[0015] Compared with the prior art, the bearing ventilation and pressure relief device of the present invention has the following advantages. Since a bearing ventilation and pressure relief device is provided on the outer ring of the bearing, the ventilation and pressure relief device includes a valve body and a sealing ball disposed inside the valve body. When the temperature inside the bearing rises during operation, the sealing ball can move inside the valve body, thereby releasing the pressure inside the bearing, ensuring the same pressure inside and outside the bearing, and thus ensuring the normal operation of the bearing. At the same time, the device has the advantages of simple structure, convenient processing and installation. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 Structural diagram of a bearing with the ventilation and pressure relief device disclosed in the present invention;

[0017] Figure 2 Structural diagram of the first embodiment of the bearing sealing device;

[0018] Figure 3 Structural diagram of the ventilation and pressure relief device disclosed in the present invention in a sealed state;

[0019] Figure 4 is Figure 3 left view of;

[0020] Figure 5 Structural diagram of the ventilation and pressure relief device disclosed in the present invention in a pressure relief state;

[0021] Figure 6 is Figure 5 left view of;

[0022] Figure 7 Structural diagram of the second embodiment of the ventilation and pressure relief device disclosed in the present invention.

[0023] In the figure: 1. Valve body; 10. Pressure relief part; 100. Pressure relief groove; 10a. Outline of the inscribed circle of the pressure relief part; 10b. Outline of the circumscribed circle of the pressure relief part; 10c. Outline of the sealing ball; 11. Sealing ball accommodating part; 12. Ventilation part; 13. Annular groove; 2. Sealing ball; 3. Rolling element; 4. Outer ring; 40. Pressure relief device mounting hole; 5. Cage; 6. Sealing device; 60. Sealing lip; 61. Metal skeleton; 7. Inner ring; 8. Retaining ring. Detailed implementation mode

[0024] Embodiment 1

[0025] As Figure 1 shown, the bearing with the ventilation and pressure relief device disclosed in the present invention includes an outer ring 4, two inner rings 7, two rows of rolling elements 3, two cages 5, two sets of sealing devices 6 and a retaining ring 8. Inner raceways are provided on the inner wall of the outer ring 4, and outer raceways are provided on the outer wall of the inner ring 7. The two rows of rolling elements 3 are placed in the raceways of the outer ring and the inner ring and separated by the cage 5. Retaining rings 8 and sealing devices 6 are provided at both ends of the bearing. As Figure 2 shown, the sealing device 6 includes a metal skeleton 61, a sealing lip 60 and other structures, and the sealing device can achieve dynamic sealing inside the bearing. When the self-sealing bearing works, heat is generated by the friction of internal parts. The temperature inside the bearing is higher than the external environment temperature. The gas in the internal cavity expands when heated, generating pressure on the sealing lip of the bearing sealing device, thus affecting the sealing gap. The contact seal will increase the interference of the sealing lip. In the extreme case, the non-contact seal may be compressed into a contact seal. The above situations will cause an increase in friction force, and then the bearing temperature rise will be too high, affecting the normal operation of the bearing.

[0026] A bearing ventilation and pressure relief device is provided on the outer ring of the bearing device disclosed in the present invention. As Figure 3 and Figure 4 shown, the bearing ventilation and pressure relief device includes a valve body 1 and a sealing ball 2;

[0027] The valve body 1 is installed on the outer ring 4 of the bearing. In this embodiment, a plurality of pressure relief device mounting holes 40 communicating with the outside and inside of the bearing outer ring are circumferentially machined in the middle part of the outer ring 4 of the bearing. Internal threads are machined on the inner wall of the pressure relief device mounting hole 40, and external threads are machined on the outer wall of the valve body. The valve body is fixed in the pressure relief device mounting hole of the bearing outer ring by threads. On the valve body along the radial direction of the bearing from the outside to the inside of the bearing outer ring, a pressure relief part 10, a sealing ball accommodating part 11 and a ventilation part 12 are sequentially provided;

[0028] A pressure relief groove 100 is provided on the inner wall of the pressure relief part 10. The sealing ball 2 is placed in the sealing ball accommodating part 11. When a certain pressure difference is generated between the inside and outside of the outer ring of the bearing, the sealing ball 2 can move in the sealing ball accommodating part 11. The ventilation part 12 communicates the inner side of the outer ring of the bearing with the sealing ball accommodating part 11. The pressure relief part 10 and the ventilation part 12 limit the sealing ball 2 in the sealing ball accommodating part 11.

[0029] Since the valve body 1 includes a pressure relief part 10, a sealing ball accommodating part 11, and a ventilation part 12, and the sealing ball is placed in the sealing ball accommodating part. Usually, before the bearing is installed on the locomotive, a small amount of grease is injected into the valve body, and then the sealing ball is pushed to the bottom of the sealing ball accommodating cavity. Preferably, the sealing ball is a rubber ball. Due to its certain elasticity, it can be easily installed in the sealing ball accommodating cavity. And due to its elastic properties, when the pressure is relatively large, it can deform to release the pressure. When the bearing is working normally, the internal and external pressures of the outer ring of the bearing are less than the set pressure difference. The sealing ball is placed in the sealing ball accommodating part to achieve the sealing of the pressure relief device, so as to prevent foreign objects from entering the bearing body during the normal operation of the bearing and causing pollution of the grease inside the bearing. When the temperature inside the bearing rises due to friction or other reasons during the operation of the bearing, causing the air inside the bearing to expand, and then resulting in an increase in the pressure inside the bearing, the pressure inside the bearing is greater than the external pressure. As Figure 5 and Figure 6 shown, the pressure inside the bearing pushes the sealing ball to move towards the pressure relief part side in the sealing ball accommodating cavity. The diameter of the inscribed circle 10a of the pressure relief part is smaller than the diameter 10c of the sealing ball, and the diameter 10c of the sealing ball is smaller than the diameter of the circumscribed circle 10b of the pressure relief part. So that when the sealing ball moves to the pressure relief part, it is limited in the sealing ball accommodating part and will not completely move out of the sealing ball accommodating part. Part of the sealing ball enters the pressure relief part, and part remains in the sealing ball accommodating cavity. At this time, the pressure relief groove provided on the pressure relief part communicates the sealing ball accommodating part and the outside of the outer ring. The pressure inside the bearing is released through the pressure relief groove. When the bearing stops running or the temperature inside the bearing decreases, the internal temperature drops, the volume of the gas in the internal cavity shrinks, and the sealing ball returns to the sealing ball accommodating cavity under the action of the external air pressure to achieve sealing again. In this embodiment, the ventilation part is a circular hole, and the inner diameter of the ventilation part is smaller than the diameter of the sealing ball, so that the sealing ball is limited at one end of the ventilation part in the sealing ball accommodating cavity.

[0030] The pressure relief part can be a circular hole with a diameter smaller than the diameter of the sealing ball. A pressure relief groove is machined on the inner wall of the circular hole in the axial direction. Preferably, the pressure relief part is a regular polygon hole, the diameter of the inscribed circle of the polygon hole is smaller than the diameter of the sealing ball, and the included angle between two adjacent sides of the regular polygon forms the pressure relief groove.

[0031] Further, the relief portion has a regular hexagon hole. The relief portion is a regular hexagon hole, and the included angle between two adjacent sides of the regular hexagon forms a relief groove. Since the relief portion is a regular hexagon hole, on the basis of ensuring the balance of the internal and external pressures of the bearing, it is convenient to install the relief device in the relief device installation hole on the outer ring of the bearing through tools such as a hex wrench.

[0032] Embodiment 2

[0033] As Figure 7 Shown is the second embodiment of the bearing ventilation and pressure relief device disclosed in the present invention. The difference between this embodiment and Embodiment 1 is that there is also an annular groove 13 between the relief portion 10 and the sealing ball receiving portion 11. The inner diameter of the annular groove 13 is greater than the diameter of the sealing ball 2, and the annular groove communicates with the relief groove. In this embodiment, the relief portion 10 is a regular polygon hole. The diameter of the inscribed circle (the contour line labeled 10a in the figure is the inscribed circle) of the regular polygon hole is less than the diameter of the sealing ball, and the diameter of the circumscribed circle (the contour line labeled 10b in the figure is the circumscribed circle) is greater than the diameter of the sealing ball. When the sealing ball 2 enters the annular groove 13 from the sealing ball receiving portion 11, the sealing ball 2 is in line contact with the edge of the relief portion 10 and the edge of the sealing ball receiving cavity. Point C in the figure represents the contact position of the sealing ball with the sealing ball receiving cavity, and point B in the figure represents the contact position of the sealing ball with the inscribed circle of the relief portion. With this structure, when the internal pressure of the bearing increases, the internal pressure can push the sealing ball to move towards the relief portion side in the sealing ball receiving cavity and enter the annular groove. One side of the sealing ball abuts against the relief portion, and the other side abuts against the sealing ball receiving portion. Since the sealing ball is a rubber ball, it can have a certain elastic deformation. Therefore, when the internal pressure of the bearing increases, the gas can enter the annular groove from the contact point C and be discharged through the relief portion. When the internal pressure of the bearing decreases, the sealing ball is in airtight contact with the edge of the sealing ball receiving cavity at the contact point C, and thus can be retracted into the sealing ball receiving cavity under the push of the external pressure, realizing the sealing of the inside of the bearing. This structure can effectively ensure the working performance of the ventilation and pressure relief device.

[0034] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution of the present invention and its inventive concept, makes equivalent substitutions or changes, and should be covered by the protection scope of the present invention.

Claims

1. A bearing ventilation and pressure relief device, characterized in that: It includes a valve body and a sealing ball; The valve body is installed on the outer ring of the bearing. Along the radial direction of the bearing from the outside to the inside of the outer ring of the bearing, a pressure relief part, a sealing ball accommodating part, and a ventilation part are sequentially arranged in the valve body; A pressure relief groove is provided on the inner wall of the pressure relief part. The sealing ball is placed in the sealing ball accommodating part. When a certain pressure difference is generated between the inside and outside of the outer ring of the bearing, the sealing ball can move in the sealing ball accommodating part. The ventilation part communicates the inside of the outer ring of the bearing with the sealing ball accommodating part. The pressure relief part and the ventilation part restrict the sealing ball in the sealing ball accommodating part; An annular groove is further provided between the pressure relief part and the sealing ball accommodating part. The inner diameter of the annular groove is larger than the diameter of the sealing ball, and the annular groove communicates with the pressure relief groove; The sealing ball is a rubber ball; the inner diameter of the sealing ball accommodating part is smaller than the outer diameter of the sealing ball; When the pressure difference between the inside and outside of the outer ring of the bearing is less than the set pressure difference, the sealing ball enters the sealing ball accommodating part under the action of the pressure difference to seal the pressure relief device; When the pressure difference between the inside and outside of the outer ring of the bearing is greater than the set pressure difference, the sealing ball enters the annular groove under the action of the pressure difference to relieve the pressure of the pressure relief device; The pressure relief part is a regular polygon hole. The diameter of the inscribed circle of the regular polygon hole is smaller than the diameter of the sealing ball, and the diameter of the circumscribed circle is larger than the diameter of the sealing ball. When the sealing ball enters the annular groove from the sealing ball accommodating part, the sealing ball is in line contact with the edge of the pressure relief part and the edge of the sealing ball accommodating cavity. When the internal pressure of the bearing decreases, the sealing ball is in airtight contact with the edge of the sealing ball accommodating cavity, and the sealing ball can retract into the sealing ball accommodating cavity under the action of the external pressure.

2. The bearing ventilation and pressure relief device according to claim 1, wherein: The sealing ball accommodating part is filled with grease.

3. The bearing ventilation and pressure relief device according to claim 1, characterized in that: The pressure relief part is a regular hexagon hole.

4. The bearing ventilation and pressure relief device according to claim 1, characterized in that: The valve body is threadedly connected to the outer ring of the bearing.

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