Bearing for rail vehicle, axle box device, rail vehicle and control method

Abstract

The present disclosure provides a bearing, an axle box device, a rail vehicle and a control method for a rail vehicle, wherein the bearing comprises: a bearing body, adapted to connect the axle of the rail vehicle to the bearing box; a detection portion, mounted at a sealing position of the bearing body, configured to detect the internal pressure of the bearing body; a first vent valve, mounted on the bearing body, adapted to connect the interior of the bearing body with the external environment to release the internal pressure of the bearing body when the internal pressure of the bearing body exceeds a first preset pressure; and a second vent valve, mounted on the bearing body, adapted to open to release the internal pressure of the bearing body when the internal pressure of the bearing body exceeds a second preset pressure for a continuous first preset time, or when the internal pressure of the bearing body exceeds the second preset pressure for a preset number of times within the second preset time, and to close when the internal pressure of the bearing body drops below the second preset pressure.

Description

Technical Field

[0001] At least one embodiment of the present disclosure relates to the technical field of rail vehicle bearings, and more particularly, to a bearing, an axle box device, a rail vehicle, and a control method for a rail vehicle. Background Art

[0002] Bearings are important transmission components of rail vehicles, and their reliability is crucial to the safe operation of rail vehicles.

[0003] Existing bearings used in rail vehicles, especially contact sealed bearings used in high-speed EMUs, are usually equipped with a vent valve on the bearing body to release the internal pressure of the bearing, thereby reducing the bearing temperature and ensuring normal operation of the rail vehicle.

[0004] However, when the vent valve of existing bearings used in rail vehicles is blocked, the internal pressure of the bearing increases, the contact pressure of the sealing part increases, and the heat generated by the seal increases, which can easily cause the bearing temperature to rise abnormally. In addition, the vent valve blockage is difficult to detect. Summary of the Invention

[0005] In view of this, the present disclosure provides a bearing for a rail vehicle to avoid an abnormal increase in bearing temperature caused by an increase in internal pressure of the bearing due to a blockage of a vent valve.

[0006] According to a first aspect of the present disclosure, a bearing for a rail vehicle is provided, comprising: a bearing body adapted to connect an axle of the rail vehicle to a bearing box; a detection portion installed at a sealing position of the bearing body and configured to detect the internal pressure of the bearing body; a first vent valve installed on the bearing body and adapted to connect the interior of the bearing body with the external environment to release the internal pressure of the bearing body when the internal pressure of the bearing body exceeds a first preset pressure; and a second vent valve installed on the bearing body, the second vent valve being opened to release the internal pressure of the bearing body when the internal pressure of the bearing body exceeds a second preset pressure for a continuous first preset time, or when the internal pressure of the bearing body exceeds the second preset pressure a preset number of times within a second preset time, and the second vent valve being closed when the internal pressure of the bearing body drops below the second preset pressure; wherein the second preset pressure is greater than the first preset pressure.

[0007] According to an embodiment of the present disclosure, a first accommodating cavity that is recessed downward is formed inside the outer ring of the bearing body; the second vent valve is installed inside the first accommodating cavity, and one end is movably extended from the bottom of the first accommodating cavity, and is configured to abut against or disengage from the vent of the bearing body to seal or release the vent.

[0008] According to an embodiment of the present disclosure, the second vent valve includes: a drive assembly installed inside the first accommodating chamber; and a valve body, a first end of the valve body being connected to the drive assembly, and a second end of the valve body being movably extended from the bottom of the first accommodating chamber, and being driven by the drive assembly to approach or move away from the vent.

[0009] According to an embodiment of the present disclosure, the drive assembly includes: a base, installed inside the first accommodating cavity; a spring, one end of which is connected to the base; an iron core, both ends of which are respectively connected to the other end of the spring and the first end of the valve body; and a coil, installed on the outside of the iron core; wherein, when the coil is energized, under the action of the current of the coil, the iron core overcomes the elastic force of the spring and moves away from the vent to drive the valve body to detach from the vent; when the coil is de-energized, under the action of the elastic force of the spring, the iron core moves toward the vent to drive the valve body to abut against the vent.

[0010] According to an embodiment of the present disclosure, the detection part includes: a support frame installed in the sealing position of the bearing body; and a diaphragm installed inside the support frame, and both sides of the diaphragm are in contact with the interior of the bearing body and the external environment respectively; wherein, when there is a pressure difference between the interior of the bearing body and the external environment, the diaphragm deforms, resulting in a change in resistance value to detect the internal pressure of the bearing body.

[0011] According to an embodiment of the present disclosure, a second accommodating cavity that is recessed downward is formed inside the outer ring of the bearing body; the first vent valve includes: a vent plug that is installed inside the second accommodating cavity, one end of which extends from the bottom of the second accommodating cavity and extends into the interior of the bearing body. When the pressure inside the bearing body exceeds the first preset pressure, the vent plug is pushed outward to release the pressure inside the bearing body.

[0012] A second aspect of the present disclosure provides an axle box device for a rail vehicle, comprising: a bearing box; and the bearing for a rail vehicle described in the above embodiment, installed inside the bearing box.

[0013] According to an embodiment of the present disclosure, the bearing box includes an axle box body, and an axle box front cover and an axle box rear cover installed at both ends of the axle box body extending in the axial direction; wherein a through hole is formed on the axle box rear cover to allow the axle to extend into.

[0014] A third aspect of the present disclosure provides a rail vehicle, comprising: the axle box device for a rail vehicle described in the above embodiment; and an axle, one end of which extends into the interior of the bearing box and is mounted on the bearing box through the bearing.

[0015] A fourth aspect of the present disclosure provides a method for controlling the internal pressure of a bearing for a rail vehicle applicable to the above-mentioned embodiment, comprising: a detection unit acquiring the internal pressure of a bearing body; connecting the interior of the bearing body with the external environment to release the internal pressure of the bearing body when the internal pressure of the bearing body exceeds a first preset pressure; controlling the second vent valve to open to release the internal pressure of the bearing body when the internal pressure of the bearing body exceeds a second preset pressure for a continuous first preset time, or when the internal pressure of the bearing body exceeds the second preset pressure a preset number of times within a second preset time; and controlling the second vent valve to close when the internal pressure of the bearing body drops below the second preset pressure; wherein the second preset pressure is greater than the first preset pressure.

[0016] According to an embodiment of the present disclosure, the method for controlling the internal pressure of a bearing of a rail vehicle further includes: after the second vent valve is opened for a third preset time, if the internal pressure of the bearing body still exceeds the second preset pressure, reducing the traveling speed of the rail vehicle to reduce the rate of increase of the internal pressure of the bearing body.

[0017] According to the above-described embodiment of the present disclosure, a bearing for a rail vehicle is provided with a second vent valve installed on the bearing body. This allows the second vent valve to open and release pressure from the bearing body if the internal pressure of the bearing body exceeds a second preset pressure for a sustained period of time exceeding a first preset pressure, or if the internal pressure of the bearing body exceeds the second preset pressure a preset number of times within the second preset time. In other words, if the internal pressure of the bearing body exceeds the second preset pressure, the first vent valve will malfunction, and the second vent valve will open to release pressure from the bearing body. This prevents the situation in which, when the first vent valve becomes clogged, the pressure within the bearing body increases, the contact pressure at the sealing area increases, and the heat generated by the seal increases, which can easily cause an abnormal increase in bearing temperature and makes it difficult to detect the blockage of the first vent valve.

[0018] Furthermore, if the pressure inside the bearing body drops below a second preset pressure, the second vent valve closes. In other words, under normal circumstances, the pressure inside the bearing body is released by the first vent valve, while the second vent valve remains closed. The second vent valve is only opened when the pressure inside the bearing body exceeds the second preset pressure to prevent frequent opening of the second vent valve, which could lead to grease accumulation and blockage. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is a cross-sectional view of an axle box device for a rail vehicle according to an embodiment of the present disclosure;

[0020] Figure 21 is a schematic diagram of the installation between a second vent valve, a detection unit and a bearing body of a bearing for a rail vehicle according to an embodiment of the present disclosure;

[0021] Figure 3 is a side view of a bearing for a rail vehicle according to an embodiment of the present disclosure;

[0022] Figure 4 1 is a schematic diagram of the installation of a second vent valve and a bearing body for a rail vehicle bearing according to an embodiment of the present disclosure;

[0023] Figure 5 is a schematic plan view of a first vent valve for a bearing of a rail vehicle according to an embodiment of the present disclosure;

[0024] Figure 6 yes Figure 2 A partial enlarged view of part A; and

[0025] Figure 7 is a flow chart of a method for controlling the internal pressure of a bearing of a rail vehicle according to an embodiment of the disclosure.

[0026] In the picture:

[0027] 1-bearing body;

[0028] 11-outer ring; 111-first accommodating cavity; 112-second accommodating cavity;

[0029] 12- vent;

[0030] 2- axle;

[0031] 3-bearing box;

[0032] 31-axle box body;

[0033] 32-axle box front cover;

[0034] 33- axle box rear cover; 331- through hole;

[0035] 4-first vent valve; 41-vent plug;

[0036] 5-detection part; 51-support frame; 52-diaphragm;

[0037] 6- Second vent valve;

[0038] 61-driving assembly; 611-base; 612-spring; 613-iron core; 614-coil;

[0039] 62-valve body; 621-first end; 622-second end;

[0040] 7-Bearing. DETAILED DESCRIPTION

[0041] In order to make the objectives, technical solutions and advantages of the present disclosure more clearly understood, the present disclosure is further described in detail below in conjunction with specific embodiments and with reference to the accompanying drawings.

[0042] However, it should be understood that these descriptions are exemplary only and are not intended to limit the scope of the present disclosure. In the detailed description below, for ease of explanation, many specific details are set forth to provide a comprehensive understanding of the embodiments of the present disclosure. However, it is obvious that one or more embodiments can also be implemented without these specific details. In addition, in the following description, descriptions of well-known structures and technologies are omitted to avoid unnecessary confusion of the concepts of the present disclosure.

[0043] The terms used herein are only for describing specific embodiments and are not intended to limit the present disclosure. The terms "comprise," "include," etc. used herein indicate the presence of the features, steps, operations, and / or components, but do not exclude the presence or addition of one or more other features, steps, operations, or components.

[0044] All terms used herein (including technical and scientific terms) have the meanings commonly understood by those skilled in the art unless otherwise defined. It should be noted that the terms used herein should be interpreted as having a meaning consistent with the context of this specification and should not be interpreted in an idealized or overly rigid manner.

[0045] According to the inventive concept of one aspect of the present disclosure, there is provided a bearing for a rail vehicle, comprising: a bearing body, adapted to connect an axle of a rail vehicle to a bearing box; a detection portion, mounted at a sealing position of the bearing body, configured to detect the internal pressure of the bearing body; a first vent valve, mounted on the bearing body, adapted to connect the interior of the bearing body with the external environment to release the internal pressure of the bearing body when the internal pressure of the bearing body exceeds a first preset pressure; and a second vent valve, mounted on the bearing body, adapted to open to release the internal pressure of the bearing body when the internal pressure of the bearing body exceeds a second preset pressure for a continuous first preset time, or when the internal pressure of the bearing body exceeds the second preset pressure for a preset number of times within the second preset time, and to close when the internal pressure of the bearing body drops below the second preset pressure; wherein the second preset pressure is greater than the first preset pressure.

[0046] Figure 1 is a cross-sectional view of an axle box device for a rail vehicle according to an embodiment of the present disclosure; Figure 2 1 is a schematic diagram of the installation between a second vent valve, a detection unit and a bearing body of a bearing for a rail vehicle according to an embodiment of the present disclosure; Figure 3 is a side view of a bearing for a rail vehicle according to an embodiment of the present disclosure.

[0047] According to an exemplary embodiment of the present disclosure, please refer to Figure 1-Figure 3 , provides a bearing for a rail vehicle, comprising a bearing body 1, a detection portion 5, a first vent valve 4, and a second vent valve 6. The bearing body 1 is suitable for connecting the axle 2 of the rail vehicle to the bearing box 3. The detection portion 5 is installed in a sealing position of the bearing body 1 and is configured to detect the internal pressure of the bearing body 1. The first vent valve 4 is installed on the bearing body 1 and is suitable for connecting the interior of the bearing body 1 with the external environment to release the internal pressure of the bearing body 1 when the internal pressure of the bearing body 1 exceeds a first preset pressure. The second vent valve 6 is installed on the bearing body 1. When the internal pressure of the bearing body 1 exceeds the second preset pressure for a first preset time, or when the internal pressure of the bearing body 1 exceeds the second preset pressure for a preset number of times within the second preset time, the second vent valve 6 opens to release the internal pressure of the bearing body 1, and when the internal pressure of the bearing body 1 drops below the second preset pressure, the second vent valve 6 closes. The second preset pressure is greater than the first preset pressure.

[0048] By installing a second vent valve 6 on the bearing body 1, if the internal pressure of the bearing body 1 exceeds the second preset pressure for a first preset time, or if the internal pressure of the bearing body 1 exceeds the second preset pressure a preset number of times within the second preset time, the second vent valve 6 opens to release the pressure within the bearing body 1. In other words, if the internal pressure of the bearing body 1 exceeds the second preset pressure, the first vent valve 4 will malfunction, and the second vent valve 6 will open to release the pressure within the bearing body 1. This prevents the situation where, when the first vent valve 4 becomes clogged, the pressure inside the bearing 1 increases, the contact pressure at the sealing part increases, and the heat generated by the seal increases, which can easily cause an abnormal increase in the bearing temperature and is difficult to detect when the first vent valve 4 is clogged. Furthermore, the internal pressure of the bearing body 1 can be detected, and the abnormal increase in the bearing temperature caused by the bleed air due to the increased pressure inside the bearing 1 can be avoided.

[0049] Furthermore, if the pressure inside the bearing body 1 drops below a second preset pressure, the second vent valve 6 is closed. In other words, under normal circumstances, the pressure inside the bearing body 1 is released by the first vent valve 4, and the second vent valve 6 is closed. The second vent valve 6 is opened only when the pressure inside the bearing body 1 exceeds the second preset pressure to prevent frequent opening of the second vent valve 6, which could lead to grease accumulation and blockage.

[0050] It should be noted that in this embodiment, failure of the first vent valve 4 is primarily caused by grease clogging the vent plug 41. After the vent plug 41 becomes clogged, the grease will gradually release from the vent plug 41 due to its own weight. Once the grease releases from the vent plug 41, the first vent valve 4 resumes normal operation. If the vent plug 41 is severely clogged and the grease cannot release from the vent plug 41 due to its own weight, the first vent valve 4 needs to be replaced.

[0051] Figure 4 Schematic diagram of the installation of a second vent valve and a bearing body for a rail vehicle bearing according to an embodiment of the present disclosure.

[0052] In some exemplary embodiments, referring to Figures 1-4 A first accommodating cavity 111 which is recessed downward is formed inside the outer ring 11 of the bearing body 1; the second vent valve 6 is installed inside the first accommodating cavity 111, and one end of the second vent valve 6 is movably extended from the bottom of the first accommodating cavity 111, and is configured to abut against or disengage from the vent 12 of the bearing body 1 to block or release the vent 12.

[0053] Through the above-mentioned arrangement, one end of the second vent valve 6 installed in the first accommodating cavity 111 abuts against or disengages from the vent 12 to block or release the vent 12, thereby isolating or connecting the interior of the bearing body 1 with the external environment. Furthermore, when the pressure inside the bearing body 1 exceeds the second preset pressure for a first preset time, or when the pressure inside the bearing body 1 exceeds the second preset pressure a preset number of times within the second preset time, the second vent valve 6 opens to release the pressure inside the bearing body 1. Furthermore, when the pressure inside the bearing body 1 drops below the second preset pressure, the second vent valve 6 closes.

[0054] In some exemplary embodiments, referring to Figure 4 The second vent valve 6 includes a drive assembly 61 and a valve body 62. The drive assembly 61 is mounted within the first accommodating chamber 111. A first end 621 of the valve body 62 is connected to the drive assembly 61, and a second end 622 of the valve body 62 is movably extended from the bottom of the first accommodating chamber 111. Driven by the drive assembly 61, the valve body 62 moves toward or away from the vent 12.

[0055] Through the above arrangement, driven by the drive assembly 61, the valve body 62 can be movably extended or retracted from the bottom of the first accommodating chamber 111, so that the second end 622 of the valve body 62 approaches or moves away from the vent 12, thereby blocking or releasing the vent 12. Thus, the technical requirements are met for opening the second vent valve 6 to release the pressure inside the bearing body 1 when the pressure inside the bearing body 1 exceeds the second preset pressure for a continuous first preset time, or when the pressure inside the bearing body 1 exceeds the second preset pressure a preset number of times within the second preset time, and for closing the second vent valve 6 when the pressure inside the bearing body 1 drops below the second preset pressure.

[0056] In some exemplary embodiments, referring to Figure 4 The driving assembly 61 includes: a base 611, a spring 612, an iron core 613 and a coil 614. The base 611 is installed inside the first accommodating chamber 111. One end of the spring 612 is connected to the base 611. The two ends of the iron core 613 are respectively connected to the other end of the spring 612 and the first end 621 of the valve body 62. The coil 614 is installed on the outside of the iron core 613. When the coil 614 is energized, under the action of the current of the coil 614, the iron core 613 overcomes the elastic force of the spring 612 and moves away from the vent 12 to drive the valve body 62 to detach from the vent 12; when the coil 614 is de-energized, under the action of the elastic force of the spring 612, the iron core 613 moves toward the vent 12 to drive the valve body 62 to abut against the vent 12. Thus, the vent 12 is blocked or released to meet the technical needs of opening the second vent valve 6 to release the internal pressure of the bearing body 1 when the internal pressure of the bearing body 1 exceeds the second preset pressure for a first preset time, or when the internal pressure of the bearing body 1 exceeds the second preset pressure for a preset number of times within the second preset time, and closing the second vent valve 6 when the internal pressure of the bearing body 1 drops below the second preset pressure.

[0057] Figure 6 yes Figure 2 A partial enlarged view of part A.

[0058] In some exemplary embodiments, referring to Figure 1-Figure 2 as well as Figure 6 The detection unit 5 includes a support frame 51 and a diaphragm 52. The support frame 51 is mounted in a sealed position within the bearing body 1. The diaphragm 52 is mounted within the support frame 51, with its two sides in contact with the interior of the bearing body 1 and the external environment, respectively. When a pressure difference exists between the interior of the bearing body 1 and the external environment, the diaphragm 52 deforms, causing a change in resistance to detect the internal pressure of the bearing body 1.

[0059] In this embodiment, the internal pressure of the bearing body 1 is detected by the detection unit 5. When a pressure difference occurs between the inside of the bearing body 1 and the external environment, the two sides of the diaphragm 52 sense the difference in pressure on both sides, deform, and produce a change in resistance value. Based on the deformation amount of the diaphragm 52 and the change in resistance value, the internal pressure of the bearing body 1 is detected with the external environment atmospheric pressure as the standard value.

[0060] When the deformation of the diaphragm 52 reaches a first preset deformation, it indicates that the pressure inside the bearing body 1 has reached the first preset pressure. At this time, the first vent valve 4 is opened to release the pressure inside the bearing body 1. When the deformation of the diaphragm 52 reaches a second preset deformation, it indicates that the pressure inside the bearing body 1 has reached the second preset pressure. At this time, the first vent valve 4 has failed, and the second vent valve 6 is opened to release the pressure inside the bearing body 1.

[0061] Figure 5 4 is a schematic plan view of a first vent valve for a bearing of a rail vehicle according to an embodiment of the present disclosure.

[0062] In some exemplary embodiments, referring to Figure 3 as well as Figure 5 A second, downwardly recessed accommodating cavity 112 is formed within the outer ring 11 of the bearing body 1. The first vent valve 4 includes a vent plug 41. The vent plug 41 is mounted within the second accommodating cavity 112, with one end extending from the bottom of the second accommodating cavity 112 and into the interior of the bearing body 1. When the pressure within the bearing body 1 exceeds a first predetermined pressure, the vent plug 41 is pushed outward to release the pressure within the bearing body 1.

[0063] Through the above arrangement, when the detection unit 5 detects that the pressure inside the bearing body 1 exceeds the first preset pressure, the vent plug 41 is pushed outward to release the pressure inside the bearing body 1. In other words, when the deformation of the diaphragm 52 reaches the first preset deformation, indicating that the pressure inside the bearing body 1 has reached the first preset pressure, the vent plug 41 is pushed outward to release the pressure inside the bearing body 1. In other words, when the pressure inside the bearing body 1 exceeds the first preset pressure but does not exceed the second preset pressure, the first vent valve 4 operates normally, and the pressure inside the bearing body 1 is released by the first vent valve 4.

[0064] According to an exemplary embodiment of the present disclosure, please refer to Figure 1 , provides an axle box device for a rail vehicle, comprising a bearing box 3 and a bearing for a rail vehicle according to any one of the above embodiments. The bearing for a rail vehicle according to the above embodiment is installed inside the bearing box 3.

[0065] The above-mentioned arrangement avoids the situation in which the first vent valve 4 is clogged with grease. In this case, the first vent valve 4 fails, the pressure inside the bearing increases, the contact pressure at the sealing part increases, and the heat generated by the seal increases, which can easily cause the bearing temperature to rise abnormally, thereby improving the driving safety of the rail vehicle.

[0066] In some exemplary embodiments, referring to Figure 1 The bearing box 3 includes an axle box body 31 and an axle box front cover 32 and an axle box rear cover 33 installed at both ends of the axle box body 31 extending in the axial direction. A through hole 331 is formed on the axle box rear cover 33 to allow the axle 2 to extend into.

[0067] According to an exemplary embodiment of the present disclosure, a rail vehicle is provided, comprising: the axle box device for rail vehicles described in the above embodiment and an axle 2. One end of the axle 2 extends into the interior of the bearing box 3 and is mounted on the bearing box 3 via a bearing 7.

[0068] In this embodiment, by detecting the internal pressure of the bearing body 1 of the axle box device and under the action of the second vent valve 6, it is avoided that in the event of a failure of the first vent valve 4, the internal pressure of the bearing body 1 increases, the contact pressure of the sealing part increases, and the heat generation of the seal increases, which may easily cause the temperature of the bearing 7 to rise abnormally and affect the operating order of the rail vehicle.

[0069] Figure 7 is a flow chart of a method for controlling the internal pressure of a bearing of a rail vehicle according to an embodiment of the disclosure.

[0070] According to an exemplary embodiment of the present disclosure, please refer to Figure 7 , provides a method for controlling the internal pressure of a bearing for a rail vehicle described in the above embodiment, comprising: a detection unit 5 obtains the internal pressure of the bearing body 1. When the internal pressure of the bearing body 1 exceeds a first preset pressure, the interior of the bearing body 1 is connected to the external environment to release the internal pressure of the bearing body 1. When the internal pressure of the bearing body 1 exceeds a second preset pressure for a first preset time, or when the internal pressure of the bearing body 1 exceeds the second preset pressure for a preset number of times within the second preset time, the second vent valve 6 is controlled to open to release the internal pressure of the bearing body 1. And when the internal pressure of the bearing body 1 drops below the second preset pressure, the second vent valve 6 is controlled to close. The second preset pressure is greater than the first preset pressure.

[0071] The internal pressure of the bearing body 1 is obtained through the detection unit 5, so that if the internal pressure of the bearing body 1 exceeds the second preset pressure for a first preset time, or if the internal pressure of the bearing body 1 exceeds the second preset pressure a preset number of times within the second preset time, the second vent valve 6 opens to release the internal pressure of the bearing body 1. In other words, if the internal pressure of the bearing body 1 exceeds the second preset pressure, it is considered that the first vent valve 4 has failed, and the second vent valve 6 opens to release the internal pressure of the bearing body 1. This prevents the first vent valve 4 from clogging, which would cause the pressure inside the bearing 1 to increase, the contact pressure at the sealing part to increase, and the heat generation of the seal to increase, which could easily cause an abnormal increase in the bearing temperature. This would also make the blockage of the first vent valve 4 difficult to detect.

[0072] Furthermore, if the pressure inside the bearing body 1 drops below a second preset pressure, the second vent valve 6 is closed. In other words, under normal circumstances, the pressure inside the bearing body 1 is released by the first vent valve 4, and the second vent valve 6 is closed. The second vent valve 6 is opened only when the pressure inside the bearing body 1 exceeds the second preset pressure to prevent frequent opening of the second vent valve 6, which could lead to grease accumulation and blockage.

[0073] In some exemplary embodiments, referring to Figure 7 The method for controlling the internal pressure of a bearing of a rail vehicle further includes: after the second vent valve 6 is opened for a third preset time, if the internal pressure of the bearing body 1 still exceeds the second preset pressure, reducing the running speed of the rail vehicle to reduce the rising speed of the internal pressure of the bearing body 1.

[0074] Through the above-mentioned setting method, when the internal pressure of the bearing body 1 still exceeds the second preset pressure after the second vent valve 6 is opened for the third preset time, the running speed of the rail vehicle is reduced to reduce the rising speed of the internal pressure of the bearing body 1, thereby further improving the driving safety of the rail vehicle.

[0075] The embodiments of the present disclosure have been described in detail with reference to the accompanying drawings. It should be noted that any implementations not depicted or described in the drawings or the main text of the specification are known to those skilled in the art and are not described in detail. Furthermore, the definitions of the various components described above are not limited to the specific structures, shapes, or methods described in the embodiments; those skilled in the art may easily modify or replace them.

[0076] Those skilled in the art will appreciate that various combinations and / or combinations of features described in the various embodiments and / or claims of this disclosure may be made, even if such combinations or combinations are not explicitly described in this disclosure. In particular, various combinations and / or combinations of features described in the various embodiments and / or claims of this disclosure may be made, without departing from the spirit and teachings of this disclosure. All such combinations and / or combinations fall within the scope of this disclosure.

[0077] The specific embodiments described above further illustrate the purpose, technical solutions and beneficial effects of the present disclosure. It should be understood that the above are only specific embodiments of the present disclosure and are not intended to limit the present disclosure. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present disclosure should be included in the scope of protection of the present disclosure.

Claims

1. A bearing for a rail vehicle, comprising: A bearing body (1) adapted to connect an axle (2) of the rail vehicle to a bearing housing (3); A detection portion (5) is installed at a sealing position of the bearing body (1) and is configured to detect the internal pressure of the bearing body (1); a first vent valve (4), mounted on the bearing body (1), adapted to connect the interior of the bearing body (1) with the external environment when the internal pressure of the bearing body (1) exceeds a first preset pressure, so as to release the internal pressure of the bearing body (1); as well as a second vent valve (6) mounted on the bearing body (1); when the internal pressure of the bearing body (1) exceeds the second preset pressure for a first preset time or the internal pressure of the bearing body (1) exceeds the second preset pressure for a preset number of times within the second preset time, the second vent valve (6) opens to release the internal pressure of the bearing body (1); and when the internal pressure of the bearing body (1) drops below the second preset pressure, the second vent valve (6) closes; The second preset pressure is greater than the first preset pressure.

2. The bearing for a rail vehicle according to claim 1, wherein: A first accommodating cavity (111) that is recessed downward is formed inside the outer ring (11) of the bearing body (1); the second vent valve (6) is installed inside the first accommodating cavity (111), and one end of the second vent valve (6) is movably extended from the bottom of the first accommodating cavity (111), and is configured to abut against or disengage from the vent (12) of the bearing body (1) to block or release the vent (12).

3. The bearing for a rail vehicle according to claim 2, wherein: The second vent valve (6) comprises: a drive assembly (61), installed inside the first accommodating chamber (111); and A valve body (62), wherein a first end (621) of the valve body (62) is connected to the drive assembly (61), and a second end (622) of the valve body (62) is movably extended from the bottom of the first accommodating chamber (111) and, under the drive of the drive assembly (61), approaches or moves away from the vent (12).

4. The bearing for a rail vehicle according to claim 3, wherein: The drive assembly (61) comprises: A base (611) is installed inside the first accommodating cavity (111); a spring (612), one end of which is connected to the base (611); An iron core (613), two ends of which are respectively connected to the other end of the spring (612) and the first end (621) of the valve body (62); and A coil (614) is mounted outside the iron core (613); When the coil (614) is energized, under the action of the current of the coil (614), the iron core (613) overcomes the elastic force of the spring (612) and moves away from the vent (12), thereby driving the valve body (62) to separate from the vent (12); when the coil (614) is de-energized, under the action of the elastic force of the spring (612), the iron core (613) moves toward the vent (12), thereby driving the valve body (62) to abut against the vent (12).

5. The bearing for a rail vehicle according to claim 1, wherein: The detection unit (5) includes: a support frame (51) mounted at a sealing position of the bearing body (1); and A diaphragm (52) is installed inside the support frame (51), and two sides of the diaphragm (52) are in contact with the inside of the bearing body (1) and the external environment respectively; Wherein, when there is a pressure difference between the interior of the bearing body (1) and the external environment, the diaphragm (52) is deformed, resulting in a change in resistance value, so as to detect the internal pressure of the bearing body (1).

6. The bearing for a rail vehicle according to claim 1, wherein: A second accommodating cavity (112) that is recessed downward is formed inside the outer ring (11) of the bearing body (1); the first vent valve (4) comprises: A vent plug (41) is installed inside the second accommodating cavity (112), with one end extending from the bottom of the second accommodating cavity (112) and extending into the interior of the bearing body (1). When the pressure inside the bearing body (1) exceeds the first preset pressure, the vent plug (41) is pushed outward to release the pressure inside the bearing body (1).

7. An axle box device for a railway vehicle, comprising: Bearing box (3); as well as The bearing for a rail vehicle according to any one of claims 1 to 6 is installed inside the bearing box (3).

8. The axle box device for a railway vehicle according to claim 7, wherein: The bearing box (3) comprises an axle box body (31), and an axle box front cover (32) and an axle box rear cover (33) installed at both ends of the axle box body (31) extending in the axial direction; Wherein, a through hole (331) is formed on the axle box rear cover (33) to allow the axle (2) to extend therein.

9. A rail vehicle comprising: An axle box device for a rail vehicle according to any one of claims 7 to 8; as well as One end of the axle (2) extends into the interior of the bearing box (3) and is mounted on the bearing box (3) through the bearing (7).

10. A method for controlling the internal pressure of a bearing for a rail vehicle applicable to any one of claims 1 to 6, comprising: S1: The detection unit (5) obtains the internal pressure of the bearing body (1); S2: when the internal pressure of the bearing body (1) exceeds a first preset pressure, connecting the interior of the bearing body (1) with the external environment to release the internal pressure of the bearing body (1); S3: when the internal pressure of the bearing body (1) exceeds the second preset pressure for a first preset time continuously, or when the internal pressure of the bearing body (1) exceeds the second preset pressure for a preset number of times within the second preset time, controlling the second vent valve (6) to open, so as to release the internal pressure of the bearing body (1); and S4: when the internal pressure of the bearing body (1) drops below the second preset pressure, controlling the second vent valve (6) to close; The second preset pressure is greater than the first preset pressure.

11. The method for controlling the internal pressure of a bearing for a rail vehicle according to claim 10, further comprising: S5: After the second vent valve (6) is opened for a third preset time, if the internal pressure of the bearing body (1) still exceeds the second preset pressure, the running speed of the rail vehicle is reduced to reduce the rate of increase of the internal pressure of the bearing body (1).

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