Elastic device and buffer having the same

Abstract

The present invention provides an elastic device and a buffer having the same. The elastic device is used in a buffer of a rail vehicle, and the elastic device includes: a cylinder body, including a first accommodating chamber and a second accommodating chamber, the first accommodating chamber and the second accommodating chamber being sealed; a piston rod, at least partially arranged in the first accommodating chamber and the second accommodating chamber; wherein elastic putty is provided in both the first accommodating chamber and the second accommodating chamber, and the piston rod is movably arranged in the first accommodating chamber and the second accommodating chamber to provide elastic force to the rail vehicle by compressing or releasing the elastic putty. The technical solution of the present invention can solve the problem that the elastic device of the buffer in the prior art is complex in structure and has low reliability.

Description

Technical Field

[0001] The present invention relates to the technical field of rail vehicles, and in particular to an elastic device and a buffer having the same. Background Art

[0002] The buffer is one of the key components of the railway coupler system. It is a key component for alleviating the longitudinal impulse of the train and protecting the safe operation of goods.

[0003] Buffers with elastic devices as elastic elements are the preferred elastic elements for passenger cars and express trucks because of their stable performance, easy realization of nonlinearity, and long service life.

[0004] At present, the core of the cement is mainly composed of a piston rod, a sealing system, an elastic cement, and a cylinder. When the buffer is compressed, the piston rod will enter the cylinder and compress the elastic cement in the cylinder and the gap between the piston rod pressure head and the cylinder, thereby generating a certain impedance.

[0005] The existing structure mainly adopts a single chamber. Considering the low-temperature shrinkage performance of the cement core, the elastic cement in the cylinder must ensure a sufficiently large initial pressure to achieve full recovery at low temperatures. However, excessive initial pressure directly leads to excessive initial pressure of the buffer, which deteriorates the performance of the buffer. Therefore, other elastic elements are usually connected in series to achieve the purpose of reducing the initial pressure. The introduction of other elastic elements not only complicates the structure of the buffer, but also greatly reduces the reliability of the buffer. Summary of the invention

[0006] The main purpose of the present invention is to provide an elastic device and a buffer having the same, so as to solve the problem that the elastic device of the buffer in the prior art has a complex structure and low reliability.

[0007] In order to achieve the above-mentioned purpose, according to one aspect of the present invention, there is provided an elastic device for use in a buffer of a rail vehicle, the elastic device comprising: a cylinder body, comprising a first accommodating chamber and a second accommodating chamber, the first accommodating chamber and the second accommodating chamber being sealed; a piston rod, at least partially disposed in the first accommodating chamber and the second accommodating chamber; wherein elastic putty is disposed in both the first accommodating chamber and the second accommodating chamber, the piston rod being movably disposed in the first accommodating chamber and the second accommodating chamber to provide elastic force to the rail vehicle by compressing or releasing the elastic putty.

[0008] Further, the cylinder body includes: a first cylinder body, the inner wall surface of the first cylinder body encloses at least part of a first accommodating chamber, and the initial pressure generated by the elastic putty filled in the first accommodating chamber is P1; a second cylinder body, connected to the first cylinder body, the inner wall surface of the second cylinder body encloses at least part of a second accommodating chamber, the piston rod extends from the first accommodating chamber into the second accommodating chamber, and the initial pressure generated by the elastic putty filled in the second accommodating chamber is P2; wherein, P1 is greater than P2.

[0009] Furthermore, the piston rod includes: a main rod body; a first piston, the first piston is sleeved on the main rod body to divide the main rod body into a first rod section and a second rod section, and one end of the second rod section away from the first rod section extends into the second accommodating chamber; wherein the outer diameter of the second rod section is smaller than the outer diameter of the first rod section.

[0010] Further, the cross-sectional area of ​​the cross section of the first cylinder body is greater than the cross-sectional area of ​​the cross section of the second cylinder body.

[0011] Further, the first rod segment, the first piston and at least a portion of the second rod segment are located in the first cylinder body.

[0012] Furthermore, the first rod segment, the first piston and the second rod segment are an integrally formed structure.

[0013] Furthermore, the cylinder body includes: a first sealing member connected to the first cylinder body; a second sealing member connected to the second cylinder body, one end face of the second sealing member and the inner wall surface of the second cylinder body form a second accommodating chamber, and the other end face of the second sealing member, the first sealing member and the inner wall surface of the first cylinder body form a first accommodating chamber.

[0014] Further, the first sealing member is threadedly connected to the first cylinder body, and / or the second sealing member is threadedly connected to the second cylinder body.

[0015] Furthermore, a through hole is provided on the first sealing member, and the piston rod is inserted into the through hole, so that the piston rod is movably arranged in the cylinder body.

[0016] Furthermore, the piston rod also includes a second piston, which is located in the second accommodating chamber and is movably arranged in the second accommodating chamber to compress or release the elastic putty.

[0017] Furthermore, the second piston is threadedly connected to the main rod body, or the second piston is welded to the main rod body.

[0018] According to another aspect of the present invention, a buffer is provided, comprising a buffer body and an elastic device arranged in the buffer body, wherein the elastic device is the elastic device mentioned above.

[0019] By applying the technical solution of the present invention, since the cylinder body includes a first accommodating chamber and a second accommodating chamber, and the first accommodating chamber and the second accommodating chamber are sealed, elastic cement is respectively arranged in the first accommodating chamber and the second accommodating chamber as required, so that the elastic cement in the two accommodating chambers can respectively meet the requirements of low initial impedance and low initial pressure of the buffer, thereby improving the performance of the buffer and simplifying the structure of the buffer. Compared with the elastic device in the prior art that has only one accommodating chamber and needs to connect other elastic elements in series to achieve low initial pressure, the elastic device of the present application has a simple structure, high reliability, and can simultaneously meet the requirements of low initial impedance and low initial pressure. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The drawings constituting a part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0021] Figure 1 It shows a schematic structural diagram of the first embodiment of the elastic device according to the present invention;

[0022] Figure 2 Shows Figure 1 A schematic structural diagram of a cylinder body of an elastic device (wherein the first sealing member and the second sealing member are not shown);

[0023] Figure 3 Shows Figure 1 A schematic diagram of the structure of the piston rod of the elastic device;

[0024] Figure 4 A schematic structural diagram showing a second embodiment of the elastic device according to the present invention; and

[0025] Figure 5 Shows Figure 4 Schematic diagram of the structure of the piston rod of the elastic device.

[0026] The above drawings include the following reference numerals:

[0027] 10. Cylinder body; 11. First cylinder body; 12. Second cylinder body; 13. First sealing member; 14. Second sealing member; 20. Piston rod; 21. First rod section; 22. Second rod section; 23. First piston; 24. Second piston. DETAILED DESCRIPTION

[0028] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0029] Embodiment 1

[0030] like Figure 1 As shown, the first embodiment provides an elastic device for use in a buffer of a rail vehicle, and the elastic device includes a cylinder body 10 and a piston rod 20. The cylinder body 10 includes a first accommodating chamber and a second accommodating chamber, and the first accommodating chamber and the second accommodating chamber are sealed; the piston rod 20 is at least partially arranged in the first accommodating chamber and the second accommodating chamber; elastic cement is provided in both the first accommodating chamber and the second accommodating chamber, and the piston rod 20 is movably arranged in the first accommodating chamber and the second accommodating chamber to provide elastic force to the rail vehicle by compressing or releasing the elastic cement.

[0031] In this embodiment, since the cylinder body 10 includes a first accommodating chamber and a second accommodating chamber, and the first accommodating chamber and the second accommodating chamber are sealed, elastic cement is respectively arranged in the first accommodating chamber and the second accommodating chamber as required, so that the elastic cement in the two accommodating chambers can respectively meet the requirements of low initial impedance and low initial pressure of the buffer, thereby improving the performance of the buffer and simplifying the structure of the buffer. Compared with the elastic device in the prior art that has only one accommodating chamber and needs to connect other elastic elements in series to achieve low initial pressure, the elastic device of this embodiment has a simple structure, high reliability, and can simultaneously meet the requirements of low initial impedance and low initial pressure.

[0032] like Figure 1 and Figure 2 As shown, in the first embodiment, the cylinder body 10 includes a first cylinder body 11 and a second cylinder body 12. The inner wall surface of the first cylinder body 11 encloses at least part of a first accommodating chamber, and the initial pressure generated by the elastic putty filled in the first accommodating chamber is P1; the second cylinder body 12 is connected to the first cylinder body 11, and the inner wall surface of the second cylinder body 12 encloses at least part of a second accommodating chamber, and the piston rod 20 extends from the first accommodating chamber into the second accommodating chamber, and the initial pressure generated by the elastic putty filled in the second accommodating chamber is P2; wherein, P1 is greater than P2.

[0033] Specifically, since the initial pressure generated by the elastic cement in the first accommodation chamber is relatively large, the low-temperature recovery performance of the elastic device can be met; since the initial pressure generated by the elastic cement in the second accommodation chamber is relatively small, the second accommodation chamber does not provide initial pressure. As the amount of compression of the elastic cement in the second accommodation chamber by the piston rod 20 increases, the pressure generated in the second accommodation chamber increases, and a larger impedance force is output for the elastic device. Therefore, through the above arrangement, the cylinder body 10 is divided into the first accommodation chamber and the second accommodation chamber, which can simultaneously meet the requirements of the low-temperature recovery performance and low initial pressure of the buffer.

[0034] Preferably, the pressure value of the elastic cement filled in the first accommodating chamber and the second accommodating chamber can be filled according to the elastic conditions required by the buffer.

[0035] like Figure 1 and Figure 3 As shown, in the first embodiment, the piston rod 20 includes a main rod body and a first piston 23. The first piston 23 is sleeved on the main rod body to divide the main rod body into a first rod segment 21 and a second rod segment 22, and one end of the second rod segment 22 away from the first rod segment 21 extends into the second accommodating cavity; wherein the outer diameter of the second rod segment 22 is smaller than the outer diameter of the first rod segment 21.

[0036] Specifically, since the outer diameter of the second rod segment 22 is smaller than the outer diameter of the first rod segment 21, the cross-sectional area of ​​the second rod segment 22 is smaller than the cross-sectional area of ​​the first rod segment 21. The initial pressure generated by the piston rod 20 in the first accommodation chamber is equal to the difference between the cross-sectional areas of the first rod segment 21 and the second rod segment 22 multiplied by the pressure generated by the elastic cement in the first accommodation chamber. Although the pressure generated by the elastic cement in the first accommodation chamber is relatively large, since the difference between the cross-sectional areas of the first rod segment 21 and the second rod segment 22 is relatively small, the contribution of the first accommodation chamber to the initial pressure is also relatively small, so that the initial pressure impedance of the elastic device is relatively small, meeting the initial impedance requirement of the buffer.

[0037] Furthermore, since the initial pressure generated by the elastic putty in the second accommodating chamber is relatively small, the cross-sectional area of ​​the second rod segment 22 is much larger than the difference between the cross-sectional areas of the first rod segment 21 and the second rod segment 22 relative to the cross-sectional area generated by the piston rod 20 in the first accommodating chamber. As a result, when the piston rod 20 is pressed into the second accommodating chamber, the impedance force generated in the second accommodating chamber increases significantly, so that when the buffer stroke is large, the elastic device can provide sufficient impedance force.

[0038] Preferably, the diameters of the first rod segment 21 and the second rod segment 22 and the difference between the cross-sectional areas of the first rod segment 21 and the second rod segment 22 can be set according to the impedance force that the buffer needs to be provided by the elastic device.

[0039] like Figure 2 As shown, in the first embodiment, the cross-sectional area of ​​the first cylinder body 11 is greater than the cross-sectional area of ​​the second cylinder body 12 .

[0040] In this embodiment, both the first cylinder body 11 and the second cylinder body 12 are hollow cylindrical structures, and the inner diameter of the first cylinder body 11 is greater than the inner diameter of the second cylinder body 12 .

[0041] Through the above arrangement, elastic cement is filled into the first cylinder 11 to generate an initial pressure greater than the initial pressure of the elastic cement filled into the second cylinder 12, so as to meet the low-temperature recovery performance of the elastic cement, and facilitate the movably arrangement of the first piston 23 in the first accommodating chamber.

[0042] Preferably, at least part of the first rod segment 21 , the first piston 23 and the second rod segment 22 are located in the first cylinder body 11 .

[0043] The above arrangement enables the first piston 23 to be movably arranged in the first accommodating chamber, thereby compressing or releasing the elastic putty in the first accommodating chamber, thereby providing elastic force and realizing the damping function of the buffer.

[0044] Preferably, the first rod segment 21, the first piston 23 and the second rod segment 22 are an integrally formed structure.

[0045] The above arrangement ensures the overall strength of the piston rod 20, so that the elastic device can effectively provide elastic force, thereby ensuring the reliability of the elastic device.

[0046] like Figure 1 and Figure 2 As shown, in this embodiment, the cylinder body 10 includes a first sealing member 13 and a second sealing member 14. The first sealing member 13 is connected to the first cylinder body 11; the second sealing member 14 is connected to the second cylinder body 12, one end surface of the second sealing member 14 and the inner wall surface of the second cylinder body 12 form a second accommodating cavity, and the other end surface of the second sealing member 14, the first sealing member 13 and the inner wall surface of the first cylinder body 11 form a first accommodating cavity.

[0047] Through the above arrangement, the first sealing member 13 and the second sealing member 14 isolate the first accommodating chamber from the second accommodating chamber, so that the two accommodating chambers are respectively filled with elastic glues with different initial pressures, so that the two accommodating chambers do not interfere with each other.

[0048] Preferably, the first sealing member 13 is threadedly connected to the first cylinder body 11 , and the second sealing member 14 is threadedly connected to the second cylinder body 12 .

[0049] The above arrangement is convenient for processing and assembly and has a good sealing effect.

[0050] Of course, in alternative embodiments not shown in the drawings, other connection methods may also be used, such as welding, riveting, etc.

[0051] Preferably, a through hole is provided on the first sealing member 13 , and the piston rod 20 is inserted into the through hole, so that the piston rod 20 is movably arranged in the cylinder body 10 .

[0052] Furthermore, the diameter of the through hole on the first sealing member 13 matches the outer diameter of the first rod segment 21, and the second sealing member 14 is provided with a through hole matching the outer diameter of the second rod segment 22. The above arrangement ensures that the piston rod 20 can be movably arranged in the first accommodating chamber and the second accommodating chamber.

[0053] This embodiment further provides a buffer, including a buffer body and an elastic device arranged in the buffer body, and the elastic device is the elastic device mentioned above.

[0054] In this embodiment, since the cylinder body 10 includes a first accommodating chamber and a second accommodating chamber, and the first accommodating chamber and the second accommodating chamber are sealed, elastic putty is respectively arranged in the first accommodating chamber and the second accommodating chamber as needed, so that the elastic putty in the two accommodating chambers can respectively meet the requirements of low initial impedance and low initial pressure of the buffer, thereby improving the performance of the buffer and simplifying the structure of the buffer.

[0055] Therefore, the buffer having the above elastic device also has the above advantages.

[0056] Embodiment 2

[0057] The difference between the second embodiment and the first embodiment is that:

[0058] like Figure 4 and Figure 5 As shown, in the second embodiment, the piston rod 20 further includes a second piston 24, which is located in the second accommodating chamber. The second piston 24 is movably arranged in the second accommodating chamber to compress or release the elastic putty.

[0059] Preferably, the outer diameter of the second piston 24 is smaller than the inner diameter of the second cylinder 12. Through the above arrangement, due to the effect of the gap flow, the dynamic impedance of the elastic cement will be greatly increased when the piston rod 20 moves, and the capacity of the elastic device will be increased, while the low initial pressure and low temperature recovery performance of the elastic device will not be affected.

[0060] Preferably, the second piston 24 is threadedly connected to the second rod section 22 .

[0061] The upper structure is simple and convenient for disassembly and installation of the second piston 24 .

[0062] Of course, in an alternative embodiment not shown in the drawings, welding may also be used between the second piston 24 and the second rod segment 22 .

[0063] In addition, if Figure 4 and Figure 5 As shown, in the second embodiment, a reduced diameter section is provided at one end of the second rod section 22 where the second piston 24 is mounted, so that the second rod section 22 can be installed into the second accommodating chamber through the through hole on the second sealing member 14 .

[0064] The other structures of the second embodiment are the same as those of the first embodiment and will not be described again here.

[0065] The technical solution of this application is achieved by the following methods:

[0066] The elastic device is changed from a traditional single-chamber structure to a two-chamber structure. The elastic device of this solution is mainly composed of a cylinder body 10 and a piston rod 20, and the traditional one-chamber structure is divided into a first accommodating chamber and a second accommodating chamber.

[0067] The initial pressure generated by the elastic cement in the first accommodating chamber is relatively high, so as to ensure that the elastic device can still generate relatively high pressure under low temperature conditions to restore the elastic cement. However, since the diameter of the first rod segment 21 is similar to the diameter of the second rod segment 22, that is, the difference in cross-sectional area is relatively small, the initial pressure impedance of the elastic device is relatively low.

[0068] The initial pressure generated by the elastic cement in the second accommodating chamber is relatively low. As the piston rod 20 is continuously pressed in, the pressure gradually increases. In addition, the diameter of the piston rod 20 is relatively large, and the pressure rises rapidly, providing sufficient impedance when the compression stroke of the buffer is relatively large.

[0069] The entire cylinder body 10 has a stepped structure. The diameter of the second cylinder body 12 is smaller than that of the first cylinder body 11 . Threads are provided at the positions of the first seal 13 and the second seal 14 for installing the first seal 13 and the second seal 14 .

[0070] The piston rod 20 is mainly composed of a first rod section 21, a second rod section 22 and a first piston 23. The diameter difference between the first rod section 21 and the second rod section 22 is small, so that although the initial pressure in the first accommodating chamber is high, the initial pressure of the buffer is still low.

[0071] Through the above configuration, the elastic device of the present application has the following advantages:

[0072] 1. Meet the requirements of low temperature recovery and low initial impedance of elastic devices at the same time;

[0073] 2. The basic structure of the buffer is simplified. The buffer only needs to use this one elastic device to meet the requirements for the buffer capacity, and no other auxiliary elastic elements are required.

[0074] From the above description, it can be seen that the above embodiments of the present invention achieve the following technical effects:

[0075] Since the cylinder body includes a first accommodating chamber and a second accommodating chamber, and the first accommodating chamber and the second accommodating chamber are sealed, elastic putty can be respectively arranged in the first accommodating chamber and the second accommodating chamber as required, so that the elastic putty in the two accommodating chambers can respectively meet the requirements of low initial impedance and low initial pressure of the buffer, thereby improving the performance of the buffer and simplifying the structure of the buffer. Compared with the elastic device in the prior art that has only one accommodating chamber and needs to connect other elastic elements in series to achieve low initial pressure, the elastic device of the present application has a simple structure, high reliability, and can simultaneously meet the requirements of low initial impedance and low initial pressure.

[0076] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An elastic device for use in a buffer of a rail vehicle, characterized in that: The elastic device comprises: A cylinder body (10) comprises a first accommodating chamber and a second accommodating chamber, wherein the first accommodating chamber and the second accommodating chamber are sealed; A piston rod (20) is at least partially disposed in the first accommodating chamber and the second accommodating chamber; Wherein, elastic cement is provided in both the first accommodating chamber and the second accommodating chamber, and the piston rod (20) is movably arranged in the first accommodating chamber and the second accommodating chamber to provide elastic force to the rail vehicle by compressing or releasing the elastic cement; The cylinder body (10) comprises: a first cylinder body (11), the inner wall surface of the first cylinder body (11) enclosing at least a portion of a first accommodating chamber, the initial pressure generated by the elastic putty filled in the first accommodating chamber being P1; a second cylinder body (12), connected to the first cylinder body (11), the inner wall surface of the second cylinder body (12) enclosing at least a portion of a second accommodating chamber, the piston rod (20) extending from the first accommodating chamber into the second accommodating chamber, the initial pressure generated by the elastic putty filled in the second accommodating chamber being P2; wherein P1 is greater than P2; The piston rod (20) comprises: a main rod body; a first piston (23), wherein the first piston (23) is sleeved on the main rod body to divide the main rod body into a first rod section (21) and a second rod section (22), wherein an end of the second rod section (22) away from the first rod section (21) extends into the second accommodating cavity; wherein the outer diameter of the second rod section (22) is smaller than the outer diameter of the first rod section (21); The cross-sectional area of ​​the second rod segment (22) is greater than the difference between the cross-sectional areas of the first rod segment (21) and the second rod segment (22).

2. The elastic device according to claim 1, characterized in that: The cross-sectional area of ​​the cross section of the first cylinder (11) is greater than the cross-sectional area of ​​the cross section of the second cylinder (12).

3. The elastic device according to claim 1, characterized in that: At least parts of the first rod section (21), the first piston (23) and the second rod section (22) are located in the first cylinder body (11).

4. The elastic device according to claim 1, characterized in that The first rod segment (21), the first piston (23) and the second rod segment (22) are an integrally formed structure.

5. The elastic device according to claim 1, characterized in that: The cylinder body (10) comprises: A first sealing member (13) connected to the first cylinder body (11); A second sealing member (14) is connected to the second cylinder body (12); one end surface of the second sealing member (14) and the inner wall surface of the second cylinder body (12) form the second accommodating chamber; the other end surface of the second sealing member (14), the first sealing member (13) and the inner wall surface of the first cylinder body (11) form the first accommodating chamber.

6. The elastic device according to claim 5, characterized in that The first sealing member (13) is threadedly connected to the first cylinder body (11), and / or the second sealing member (14) is threadedly connected to the second cylinder body (12).

7. The elastic device according to claim 5, characterized in that: The first sealing member (13) is provided with a through hole, and the piston rod (20) is inserted into the through hole, so that the piston rod (20) can be movably arranged in the cylinder body (10).

8. The elastic device according to claim 1, characterized in that: The piston rod (20) further comprises a second piston (24), wherein the second piston (24) is located in the second accommodating chamber, and the second piston (24) is movably arranged in the second accommodating chamber to compress or release the elastic putty.

9. The elastic device according to claim 8, characterized in that The piston rod (20) comprises a main rod body, and the second piston (24) is threadedly connected to the main rod body, or the second piston (24) is welded to the main rod body.

10. A buffer, comprising a buffer body and an elastic device arranged in the buffer body, characterized in that: The elastic device is the elastic device according to any one of claims 1 to 9.

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