CN103133544B - Bearing breather plug and high ferro bearing - Google Patents

Abstract

The invention relates to the field of bearing accessories, in particular to a ventilation plug for a bearing and a high-speed rail bearing. The vent plug for the bearing includes a screw and a sealing device. The screw has an external thread for screw fit with the threaded hole on the outer ring of the bearing. The screw is correspondingly provided with a vent hole for communicating with the inside of the bearing along the axial direction. The device includes an elastic diaphragm sealing the vent hole, and an elastic exhaust slot for discharging high-pressure gas in the bearing is arranged on the elastic diaphragm or between the edge of the elastic diaphragm and the screw rod. The ventilation plug for bearings of the present invention can reduce the internal temperature and pressure of the bearing, effectively avoid the failure of the lubricating grease of the bearing, and at the same time avoid the fatigue damage caused by the reduction of the hardness of the inner and outer rings of the bearing due to the high temperature of the bearing, and greatly extend the speed of the high-speed railway. The service life of bearings for passenger cars improves the safety and reliability of high-speed railway passenger cars.

Description

Vent plugs for bearings and high-speed rail bearings

technical field

The invention relates to the field of bearing accessories, in particular to a ventilation plug for a bearing and a high-speed rail bearing.

Background technique

The high-speed railway passenger wheel set adopts double-row tapered roller bearings with seals on both sides. Due to the high speed of high-speed railway passenger vehicles (generally greater than 250km/h), the friction and heat of the bearings are relatively large during the operation of high-speed railway passenger vehicles, and the internal temperature of the bearings At the same time, because the bearing adopts a double-sided seal structure, the internal temperature and pressure of the bearing will increase rapidly during the operation of the high-speed railway passenger car, which will cause the grease in the bearing to lose its lubricating effect and accelerate the bearing damage.

Contents of the invention

The object of the present invention is to provide a vent plug for bearings that can effectively reduce the internal pressure and temperature of the bearing. The present invention also provides a high-speed rail bearing using the above-mentioned ventilation plug for the bearing.

In order to achieve the above object, the ventilation plug for bearings of the present invention adopts the following technical scheme: the ventilation plug for bearings includes a screw and a sealing device, and the screw has an external thread for screwing with the threaded hole on the outer ring of the bearing. The screw rod is correspondingly provided with a vent hole penetrating in the axial direction for communicating with the inside of the bearing, and the sealing device includes an elastic diaphragm for sealing the vent hole, on the elastic diaphragm or between the edge of the elastic diaphragm and the screw rod There is an elastic exhaust slot for discharging high-pressure gas in the bearing.

The outer periphery of the elastic diaphragm has a fixed part fixedly connected with the screw rod and a movable part gapped with the screw rod, and the gap formed between the movable part and the screw rod is the elastic air vent.

The screw is provided with a screw head, and the screw head is provided with a through hole communicating with the air hole of the screw, the sealing device is a cover set on the screw head, and the elastic diaphragm forms the cover of the cover. At the top, the cover body also includes an elastic flanging which is arranged at the lower part of the elastic diaphragm and turned downwards in the axial direction, and the elastic flanging has an inner peripheral surface closely fitted with the outer peripheral surface of the screw head; the elastic air vent It is arranged on the end surface of the elastic diaphragm, and the cross section of the elastic air vent is inverted V-shaped.

A support frame is provided in the cover body, and the support frame includes an annular end cover at the top and an annular protrusion integrally fixed at the bottom of the annular end cover.

The upper end surface of the screw head is provided with an installation process groove or the outer circumference of the screw head is provided with a tightening surface for matching with a wrench.

The beneficial effect of the ventilation plug for bearings of the present invention is that the screw rod can be fixedly connected with the corresponding threaded hole on the outer ring of the bearing through threads, the ventilation hole provided on the screw rod can communicate with the inside of the corresponding bearing, and the seal provided on the screw head The device can seal the air hole, and there is an elastic exhaust seam on the elastic diaphragm or between the edge of the elastic diaphragm and the screw to discharge the high-pressure gas in the bearing. When the high-speed railway passenger car is running at high speed, the internal temperature of the bearing is too high, If the pressure is too high, the gas inside the bearing can be discharged through the vent hole and the elastic exhaust seam in turn, which can reduce the internal temperature and pressure of the bearing, effectively avoiding the failure of the bearing grease, and avoiding the failure of the bearing due to the high temperature of the bearing. Fatigue damage caused by reduced hardness of inner and outer rings. The invention can greatly prolong the service life of the bearing for the high-speed railway passenger car, and improve the safety and reliability of the high-speed railway passenger car running. Since the elastic diaphragm is an elastic sealing structure, it is sealed when it is not exhausted, so it can effectively prevent the leakage of grease inside the bearing.

Further, the inverted V-shaped structure of the cross-section of the elastic exhaust slit facilitates the discharge of the gas inside the bearing from the elastic exhaust slit.

Further, the upper end surface of the screw head is provided with an installation process groove, which can facilitate the installation of the screw rod on the outer ring of the bearing with a screwdriver; on the outer ring.

In order to achieve the above object, the high-speed rail bearing of the present invention adopts the following technical scheme: the high-speed rail bearing includes an outer ring, and a threaded hole is opened on the outer ring, and a ventilation bolt for the bearing is installed in the threaded hole, and a ventilation bolt for the bearing It includes a screw and a sealing device, the screw has an external thread for screw fit with the threaded hole on the outer ring of the bearing, the screw is correspondingly provided with a vent hole for communicating with the inside of the bearing in the axial direction, the The sealing device includes an elastic diaphragm for sealing the vent hole, and an elastic exhaust slit for discharging high-pressure gas in the bearing is arranged on the elastic diaphragm or between the edge of the elastic diaphragm and the screw rod.

The outer periphery of the elastic diaphragm has a fixed part fixedly connected with the screw rod and a movable part gapped with the screw rod, and the gap formed between the movable part and the screw rod is the elastic air vent.

The screw is provided with a screw head, and the screw head is provided with a through hole communicating with the air hole of the screw, the sealing device is a cover set on the screw head, and the elastic diaphragm forms the cover of the cover. At the top, the cover body also includes an elastic flanging which is arranged at the lower part of the elastic diaphragm and turned downwards in the axial direction, and the elastic flanging has an inner peripheral surface closely fitted with the outer peripheral surface of the screw head; the elastic air vent It is arranged on the end surface of the elastic diaphragm, and the cross section of the elastic air vent is inverted V-shaped.

A support frame is provided in the cover body, and the support frame includes an annular end cover at the top and an annular protrusion integrally fixed at the bottom of the annular end cover.

The upper end surface of the screw head is provided with an installation process groove or the outer circumference of the screw head is provided with a tightening surface for matching with a wrench.

The beneficial effect of the high-speed rail bearing of the present invention: the screw rod can be fixedly connected with the corresponding threaded hole on the outer ring of the bearing through threads, the vent hole provided on the screw rod can communicate with the inside of the corresponding bearing, and the sealing device provided on the screw head can Seal the air hole, and there is an elastic exhaust seam on the elastic diaphragm or between the edge of the elastic diaphragm and the screw to discharge the high-pressure gas in the bearing. When the high-speed railway passenger car runs at high speed, the internal temperature of the bearing is too high and the pressure is too high. Large, the gas inside the bearing can be discharged through the vent hole and the elastic exhaust seam in turn, which can reduce the internal temperature and pressure of the bearing, effectively avoid the failure of the bearing grease, and avoid the inner and outer shell of the bearing due to the high temperature of the bearing. Fatigue damage caused by ring hardness reduction. The invention can greatly prolong the service life of the bearing for the high-speed railway passenger car, and improve the safety and reliability of the high-speed railway passenger car running. Since the elastic diaphragm is an elastic sealing structure, it is sealed when it is not exhausted, so it can effectively prevent the leakage of grease inside the bearing.

Further, the inverted V-shaped structure of the cross-section of the elastic exhaust slit facilitates the discharge of the gas inside the bearing from the elastic exhaust slit.

Further, the upper end surface of the screw head is provided with an installation process groove, which can facilitate the installation of the screw rod on the outer ring of the bearing with a screwdriver; on the outer ring.

Description of drawings

Fig. 1 is the schematic structural view of Embodiment 1 of the ventilation plug for bearings of the present invention;

Fig. 2 is the top view of Fig. 1;

Fig. 3 is the structural representation of screw rod among Fig. 1;

Fig. 4 is the top view of Fig. 3;

Fig. 5 is a schematic structural view of the sealing device in Fig. 1;

Fig. 6 is a schematic structural diagram of the skeleton in Fig. 5;

Fig. 7 is a schematic structural view of Embodiment 1 of the high-speed rail bearing of the present invention;

Fig. 8 is a partial enlarged view of A in Fig. 7 .

Detailed ways

Embodiment 1 of the ventilation plug for bearings of the present invention, as shown in Figures 1-6: the ventilation plug for bearings includes a screw 1 and a sealing device, the sealing device is arranged on the end face of the screw 1, and the screw 1 is made of 20 steel , the screw is provided with a screw head 11, the screw 1 has an external thread 10 for screw fit with the threaded hole on the outer ring of the bearing, and the screw is correspondingly provided with a vent hole penetrating in the axial direction for communicating with the inside of the bearing 12. The screw head is provided with a through hole communicating with the air hole of the screw rod. The sealing device is a cover body 2 sleeved on the screw head. The cover body 2 includes a cover for sealing the air hole on the upper end surface of the screw head The elastic diaphragm 21 and the elastic flange 22 which is arranged at the bottom of the elastic diaphragm and turned downwards in the axial direction, the elastic diaphragm 21 constitutes the top of the cover body 2, and the elastic flange 22 has a connection with the screw head 11 The outer peripheral surface fits tightly against the mating inner peripheral surface. The elastic diaphragm 21 is provided with an elastic exhaust slit 211 for discharging the high-pressure gas in the bearing. The cross section of the elastic air vent 211 is an inverted V shape. The cover body 2 is provided with a supporting frame 23, and the supporting frame 23 includes an annular end cap 231 at the top and an annular protrusion 232 integrally fixed at the bottom of the annular end cap. An installation process groove 111 is opened on the upper end surface of the screw head 11 . The elastic diaphragm adopts fluorine rubber.

Example 1 of the bearing vent plug is assembled and used: after the bearing is assembled, use a screwdriver to screw the screw of the bearing vent plug into the threaded hole of the outer ring of the bearing; then press the cover body into the screw head by hand, The cover body and the screw head are in an interference fit, so that the elastic diaphragm and the screw head are integrated.

In addition to the above-mentioned embodiment of the venting plug for bearings of the present invention, the sealing device in other embodiments of the venting plug for bearings of the present invention can also only be made of an elastic diaphragm, and the elastic diaphragm can be bonded on the end surface of the screw rod, or The seal is embedded in the groove opened on the end face of the screw or the hole wall of the vent hole.

In addition to the above-mentioned embodiments of the venting plug for bearings of the present invention, in other embodiments of the venting plug for bearings of the present invention, the outer periphery of the elastic diaphragm has a fixed part that is fixedly connected with the bolt and a movable part that cooperates with the bolt. The gap formed between the part and the bolt is the elastic air vent.

In addition to the above embodiments of the vent plug for bearings of the present invention, in other embodiments of the vent plug for bearings of the present invention, the sealing device can also be arranged in the vent hole of the screw.

In addition to the above-mentioned implementation of the ventilation plug for bearings of the present invention, in other embodiments of the ventilation plug for bearings of the present invention, a tightening surface for cooperating with a wrench is provided on the outer circumference of the screw head, such as a hexagonal head, and the upper end surface of the screw head There is no installation process slot.

Embodiment 1 of the high-speed rail bearing of the present invention, as shown in FIGS. The structure of the plug 41 is the same as that of Embodiment 1 of the above-mentioned bearing ventilation plug of the present invention, and will not be repeated here.

Other embodiments of the high-speed rail bearing of the present invention include an outer ring, and a threaded hole is provided on the outer ring, and a vent plug for a bearing is assembled in the threaded hole. The structures of the embodiments are the same, and will not be repeated here.

Claims (10)

1. The ventilation plug for the bearing is characterized in that it comprises a screw rod and a sealing device arranged on the end face of the screw rod, the screw rod has an external thread for screw fit with the threaded hole on the outer ring of the bearing, and the corresponding There is a vent hole penetrating in the axial direction for communicating with the inside of the bearing, and the sealing device includes an elastic diaphragm that seals the vent hole, on the elastic diaphragm or between the edge of the elastic diaphragm and the screw rod Elastic venting slot for discharging high-pressure gas inside the bearing. 2. The ventilation plug for bearing according to claim 1, characterized in that, the outer periphery of the elastic diaphragm has a fixed connection part fixedly connected with the screw rod and a movable part which cooperates with the screw rod in a gap, and the gap between the movable part and the screw rod is A gap is formed as the elastic air vent. 3. The ventilation plug for bearing according to claim 1, characterized in that, the screw is provided with a screw head, and the screw head is provided with a through hole communicating with the ventilation hole of the screw, and the sealing device is a sleeve The cover body arranged on the screw head, the elastic membrane constitutes the top of the cover body, and the cover body also includes an elastic flange which is arranged on the lower part of the elastic membrane and is turned down in the axial direction, and the elastic flange has a The outer peripheral surface of the head is closely matched with the inner peripheral surface; the elastic air venting seam is arranged on the end surface of the elastic diaphragm, and the cross section of the elastic air venting seam is an inverted V shape. 4. The ventilation plug for bearings according to claim 3, characterized in that, a support frame is provided in the cover body, and the support frame includes an annular end cover at the top and an annular protrusion integrally fixed at the bottom of the annular end cover. rise. 5. The ventilation plug for bearing according to claim 3 or 4, characterized in that, the upper end surface of the screw head is provided with an installation process groove or the outer circumference of the screw head is provided with a tightening surface for matching with a wrench. 6. High-speed rail bearings, including an outer ring, characterized in that: the outer ring is provided with a threaded hole, and the threaded hole is equipped with a ventilation plug for the bearing, and the ventilation plug for the bearing includes a screw and is arranged on the end surface of the screw. The sealing device, the screw rod has an external thread for screw fit with the threaded hole on the outer ring of the bearing, the screw rod is correspondingly provided with a vent hole penetrating in the axial direction for communicating with the inside of the bearing, the sealing device It includes an elastic diaphragm sealing the vent hole, and an elastic exhaust slot for discharging high-pressure gas in the bearing is arranged on the elastic diaphragm or between the edge of the elastic diaphragm and the screw rod. 7. The high-speed rail bearing according to claim 6, characterized in that, the outer circumference of the elastic diaphragm has a fixed part fixedly connected with the screw rod and a movable part which cooperates with the screw rod in a gap, and the gap formed between the movable part and the screw rod Slit for the elastic vent. 8. The high-speed rail bearing according to claim 6, characterized in that, the screw is provided with a screw head, and the screw head is provided with a through hole communicating with the air hole of the screw, and the sealing device is sleeved on the The cover body on the screw head, the elastic diaphragm constitutes the top of the cover body, and the cover body also includes an elastic flange that is located at the bottom of the elastic diaphragm and is turned down in the axial direction, and the elastic flange has a connection with the screw head The outer peripheral surface is closely matched with the inner peripheral surface; the elastic air venting seam is arranged on the end surface of the elastic diaphragm, and the cross section of the elastic air venting seam is inverted V-shaped. 9. The high-speed rail bearing according to claim 8, wherein a support frame is provided in the cover, and the support frame includes an annular end cover at the top and an annular protrusion integrally fixed at the bottom of the annular end cover. 10. The high-speed rail bearing according to claim 8 or 9, characterized in that, the upper end surface of the screw head is provided with an installation process groove or the outer circumference of the screw head is provided with a tightening surface for matching with a wrench.