Railway wagon bogie lower center plate and center plate abrasion plate

Abstract

The invention belongs to the technical field of railway wagon bogies, and particularly relates to a railway wagon bogie lower center plate and a center plate abrasion plate, the railway wagon bogie lower center plate comprises a lower plate body, a plurality of pits are formed in the friction surface of the lower plate body and an upper center plate, and the area of the cross section of each pit is gradually increased from bottom to top. Strength compensation can be carried out after the lower center plate or the abrasion plate is thinned, the stage abrasion loss of the abrasion material can be effectively controlled, and the friction coefficient between the upper center plate and the lower center plate can be changed.

Description

Technical Field

[0001] The invention belongs to the technical field of railway freight car bogies, and in particular relates to a lower center plate and a center plate wear plate of a railway freight car bogie. Background Art

[0002] The connection between the bogie body and the bogie of a railway freight car is mainly through the center plate and the side bearing. Because of the different loads, it is also divided into a center plate-bearing bogie, a side bearing-bearing bogie, and a center plate and side bearing-bearing bogie. Railway freight cars are mainly center plate bogies and center plate side bearings that jointly bear bogies. The upper and lower center plates are directly matched, and the upper and lower center plates are matched with a center plate wear plate between them.

[0003] The friction resistance between the upper center plate and the lower center plate and the side bearings jointly constrain the resistance between the car body and the bogie. The friction coefficient between the upper center plate and the lower center plate affects the magnitude of the turning torque between the bogie and the car body, thereby affecting the critical speed and running stability of the vehicle, thereby affecting the dynamic performance of the vehicle. Generally, when the upper center plate and the lower center plate are directly matched, the contact surface of the two is a metal contact surface, and the range of the friction coefficient between the upper center plate and the lower center plate is basically fixed and cannot be changed according to actual requirements. Usually, a center plate wear plate made of non-metallic materials is placed between the upper center plate and the lower center plate. The upper center plate and the lower center plate are respectively connected to the center plate wear plate. The friction coefficient of the upper center plate and the lower center plate is related to the material of the center plate wear plate, thereby changing the friction coefficient of the upper center plate and the lower center plate. However, the center plate wear plate made of non-metallic materials is easily worn and has a short service life, and the friction coefficient between the upper center plate and the lower center plate cannot be changed without using the center plate wear plate. Summary of the invention

[0004] The purpose of the present invention is to provide a lower center plate and a center plate wear plate of a railway freight car bogie, which can compensate for the strength of the lower center plate or the wear plate after being worn thin, and can effectively control the staged wear amount of the wear material and change the friction coefficient between the upper center plate and the lower center plate.

[0005] To achieve the above-mentioned objectives, in a first aspect, the present invention provides a lower center plate of a railway freight car bogie, comprising a lower plate body, wherein a plurality of pits are provided on the friction surfaces between the lower plate body and the upper center plate; abrasive materials are fixedly arranged in the pits, and the abrasive materials will be ground into powder during the friction between the lower plate body and the upper center plate, and filled between the lower plate body and the upper center plate.

[0006] In some embodiments, the cross-sectional area of ​​the pit gradually increases from the bottom to the top.

[0007] Furthermore, the pit includes a plurality of equal-section segments and a plurality of variable-section segments, the equal-section segments and the variable-section segments are arranged alternately, and the cross-sectional area of ​​the variable-section segments gradually increases from the bottom to the top.

[0008] Furthermore, the abrasive material is a non-metallic material.

[0009] Furthermore, the wear material is a composite material containing polytetrafluoroethylene.

[0010] Furthermore, the abrasive material is fixed in the pit by sintering.

[0011] In some embodiments, the recess is circular or polygonal.

[0012] In a second aspect, the present invention provides a railway freight car bogie center plate wear plate, comprising a wear plate body, the wear plate body being made of a metal material, a plurality of pits being provided on the friction surface between the wear plate body and the upper center plate; wear material is fixedly arranged in the pits, the wear material will be ground into powder during the friction between the lower plate body and the upper center plate, and will be filled between the lower plate body and the upper center plate.

[0013] In some embodiments, the cross-sectional area of ​​the pit gradually increases from the bottom to the top.

[0014] Furthermore, the pit includes a plurality of equal-section segments and a plurality of variable-section segments from bottom to top, the equal-section segments and the variable-section segments are arranged alternately, and the cross-sectional area of ​​the variable-section segments gradually increases from bottom to top.

[0015] Compared with the prior art, the present invention can achieve the following beneficial effects:

[0016] 1. The present invention arranges abrasive materials in the pits. During the wear process of the lower plate body, the abrasive materials in the pits are also worn together and form powder to be filled between the lower plate body and the upper core plate, so that the friction coefficient between the lower plate body and the upper core plate changes. The friction coefficient is related to the material of the abrasive materials. Therefore, the present invention can change the friction coefficient between the upper core plate and the lower core plate without using a core plate wear plate.

[0017] 2. In the present invention, there is no need to arrange a center plate wear plate between the lower center plate and the upper center plate, and the thickness of the lower center plate can be designed to be thicker, which is beneficial to improving the service life of the lower center plate.

[0018] 3. Since the pits of the present invention are arranged with variable cross-sections, the staged wear amount of the abrasive material can be effectively controlled. As the wear increases, the cross-section of the pits becomes smaller, and the wear area of ​​the abrasive material decreases, so that the wear rate of the abrasive material decreases and reaches an approximately balanced state, that is, the abrasive material is almost no longer worn, and the friction coefficient between the upper center plate and the lower center plate remains constant.

[0019] 4. The pits of the present invention are arranged alternately with equal-section sections and variable-section sections, which can prevent the wear material from loosening and falling off, and can appropriately increase the sintering surface of the wear material to make the structure more stable.

[0020] 5. The present invention designs the wear plate body to be made of metal material and provides pits and wear materials, thereby increasing its service life and changing the friction coefficient. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a structural schematic diagram of the lower center plate of the railway freight car bogie of the present invention;

[0022] Figure 2 is a longitudinal cross-sectional view of a pit of the present invention;

[0023] Figure 3 The present invention is a schematic structural diagram of a wear plate of a center plate of a railway freight car bogie.

[0024] Reference numerals: lower disc body 1; pit 2; variable cross-section section 21; constant cross-section section 22; friction surface 3; wear disc body 4. DETAILED DESCRIPTION

[0025] The present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments, but the embodiments should not be construed as limiting the present invention.

[0026] like Figure 1 As shown, the present invention provides a lower center plate of a railway freight car bogie, comprising a lower plate body 1, a plurality of pits 2 are provided on the friction surface 3 between the lower plate body 1 and the upper center plate, the plurality of pits 2 are evenly distributed on the friction surface 3, and abrasive materials are fixedly arranged in the pits 2. The abrasive materials are ground into powder during the friction between the lower plate body 1 and the upper center plate, and are filled between the lower plate body 1 and the upper center plate. The abrasive materials can be a composite material containing polytetrafluoroethylene.

[0027] It can be understood that since abrasive material is provided in the pit 2, the abrasive material in the pit 2 is also worn together during the wear of the lower disk body 1, and forms powder and is filled between the lower disk body 1 and the upper core disk, so that the friction coefficient between the lower disk body 1 and the upper core disk changes. The friction coefficient is related to the material of the abrasive material. Therefore, the present invention can change the friction coefficient between the upper core disk and the lower core disk without using a core disk wear disk.

[0028] In some embodiments, the cross-sectional area of ​​the pit 2 increases gradually from the bottom to the top.

[0029] It should be noted that the friction resistance between the upper center plate and the lower center plate and the side bearings jointly constrain the resistance between the car body and the bogie. The friction coefficient between the upper center plate and the lower center plate affects the magnitude of the turning moment between the bogie and the car body, thereby affecting the critical speed and running stability of the vehicle, thereby affecting the dynamic performance of the vehicle. Generally, when the upper center plate and the lower center plate are directly matched, the contact surface between the two is a metal contact surface, and the range of the friction coefficient between the upper center plate and the lower center plate is basically fixed and cannot be changed according to actual requirements.

[0030] The lower center plate of the present invention is provided with abrasive materials fixed in the pit 2. During the friction between the upper center plate and the lower center plate, the abrasive materials will be worn along with the friction surface 3 of the upper center plate. During this process, the abrasive materials will be ground into powder and filled between the upper center plate and the lower center plate. When the lower center plate is worn to a certain thickness, more and more powder will be filled between the upper center plate and the lower center plate. Moreover, since the cross section of the pit 2 becomes smaller, the wear area of ​​the abrasive materials is reduced. The increasing amount of powder and the decreasing wear area will greatly reduce the wear speed of the abrasive materials, and reach a state of approximate equilibrium, that is, the abrasive materials are almost no longer worn, and the friction coefficient between the upper center plate and the lower center plate remains constant. Therefore, the present invention can change the friction coefficient between the upper center plate and the lower center plate through different abrasive materials to meet the requirements of the friction coefficient in various situations.

[0031] It should be further explained that the friction coefficient between the upper center plate and the lower center plate can be freely set by padding the non-metallic center plate wear plate, but after adding the center plate wear plate, the upper center plate and the lower center plate are in contact with the center plate wear plate respectively, and the contact area between the upper center plate and the lower center plate will become smaller. In the case of limited design space for some export wide-gauge and narrow-gauge bogies, there are requirements for both the center plate diameter and the friction coefficient, and there may be a problem that they cannot be met at the same time. The present invention can change the friction coefficient between the upper center plate and the lower center plate by setting pits and wear materials, so the friction coefficient can be set without setting the center plate wear plate, avoiding the situation where the contact area between the upper center plate and the lower center plate will become smaller, and without the center plate wear plate, the thickness of the lower center plate can be designed to be thicker, which is beneficial to improving the service life of the lower center plate.

[0032] In some embodiments, the abrasive material is fixed in the recess 2 by sintering.

[0033] In some embodiments, the pit 2 is circular or polygonal.

[0034] In some embodiments, Figure 2As shown, the pit 2 is circular, and the pit 2 includes a plurality of equal cross-section segments 22 and a plurality of variable cross-section segments 21 from the bottom to the top. The equal cross-section segments 22 and the variable cross-section segments 21 are arranged alternately, that is, from bottom to top, the first segment of the pit 2 is a variable cross-section segment 21, the second segment is a equal cross-section segment 22, the third segment is a variable cross-section segment 21, the fourth segment is a equal cross-section segment 22, and the fifth segment is a variable cross-section segment 21. The diameters of the connecting parts of two adjacent cross-section segments are equal. The cross-sectional area of ​​the variable cross-section segment 21 gradually increases from the bottom to the top, and increases linearly.

[0035] It can be understood that the alternating arrangement of the equal-section segments 22 and the variable-section segments 21 can not only prevent the wear material from loosening and falling off, but also appropriately increase the sintering surface of the wear material to make the structure more stable.

[0036] In addition, the pit 2 may also have a plurality of variable diameter sections with different diameter change rates.

[0037] Furthermore, the wear material is a non-metallic material.

[0038] The present invention also provides a railway freight car bogie center plate wear plate, and similarly, the above-mentioned pit 2 structure can also be applied to the center plate wear plate, such as Figure 3 As shown, the railway freight car bogie center plate wear plate includes a wear plate body 4, which is made of metal material. A plurality of pits 2 are provided on the friction surface 3 between the wear plate body 4 and the upper center plate, and the cross-sectional area of ​​the pits 2 gradually increases from the bottom to the top. The center plate wear plate can be made less prone to damage by providing the pits 2.

[0039] Abrasive materials are fixedly arranged in the pit 2. The abrasive materials are ground into powder during the friction between the lower plate body 1 and the upper center plate, and are filled between the lower plate body 1 and the upper center plate. The pit 2 includes a plurality of equal-section segments 22 and a plurality of variable-section segments 21 from the bottom to the top. The equal-section segments 22 and the variable-section segments 21 are arranged alternately. The cross-sectional area of ​​the variable-section segments 21 gradually increases from the bottom to the top.

[0040] In the prior art, non-metal core disk wear disks are generally made of nylon material and have a short service life.

[0041] The wear plate body 4 of the core wear plate of the present invention is made of metal and is provided with pits 2 and abrasive materials, which can improve its service life and change the friction coefficient.

[0042] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A lower center plate of a railway freight car bogie, characterized in that: The invention comprises a lower plate body (1), wherein a plurality of recesses (2) are provided on the friction surface (3) between the lower plate body (1) and the upper center plate, wherein abrasive materials are fixedly arranged in the recesses (2), and the abrasive materials are ground into powder during the friction between the lower plate body (1) and the upper center plate, and are filled between the lower plate body (1) and the upper center plate.

2. The lower center plate of a railway freight car bogie according to claim 1, characterized in that: The cross-sectional area of ​​the pit (2) gradually increases from the bottom to the top.

3. The lower center plate of a railway freight car bogie according to claim 2, characterized in that: The pit (2) comprises a plurality of equal-section segments (22) and a plurality of variable-section segments (21), wherein the equal-section segments (22) and the variable-section segments (21) are arranged alternately, and the cross-sectional area of ​​the variable-section segments (21) gradually increases from the bottom to the top.

4. A railway freight car bogie lower center plate according to any one of claims 1 to 3, characterized in that: The wear material is a non-metallic material.

5. The lower center plate of a railway freight car bogie according to claim 4, characterized in that: The wear material is a composite material containing polytetrafluoroethylene.

6. The lower center plate of a railway freight car bogie according to claim 5, characterized in that: The wear material is fixed in the recess (2) by sintering.

7. A railway freight car bogie lower center plate according to claim 1 or 2, characterized in that: The pit (2) is circular or polygonal.

8. A railway freight car bogie center plate wear plate, characterized in that: The invention comprises a wear plate body (4), wherein the wear plate body (4) is made of a metal material, and a plurality of recesses (2) are provided on the friction surface (3) between the wear plate body (4) and the upper center plate, wherein wear material is fixedly arranged in the recesses (2), and the wear material is ground into powder during the friction between the lower plate body (1) and the upper center plate, and is filled between the lower plate body (1) and the upper center plate.

9. A railway freight car bogie center plate wear plate according to claim 8, characterized in that: The cross-sectional area of ​​the pit (2) gradually increases from the bottom to the top.

10. A railway freight car bogie center plate wear plate according to claim 9, characterized in that: The pit (2) comprises a plurality of equal-section segments (22) and a plurality of variable-section segments (21) from bottom to top, wherein the equal-section segments (22) and the variable-section segments (21) are arranged alternately, and the cross-sectional area of ​​the variable-section segments (21) gradually increases from bottom to top.

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