CN111692254A - Powder metallurgy brake pad for high-cold high-temperature motor train unit - Google Patents
Powder metallurgy brake pad for high-cold high-temperature motor train unit Download PDFInfo
- Publication number
- CN111692254A CN111692254A CN202010727804.7A CN202010727804A CN111692254A CN 111692254 A CN111692254 A CN 111692254A CN 202010727804 A CN202010727804 A CN 202010727804A CN 111692254 A CN111692254 A CN 111692254A
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- CN
- China
- Prior art keywords
- brake pad
- powder metallurgy
- motor train
- train unit
- friction
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D69/00—Friction linings; Attachment thereof; Selection of coacting friction substances or surfaces
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D65/00—Parts or details
- F16D65/0031—Devices for retaining friction material debris, e.g. dust collectors or filters
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D65/00—Parts or details
- F16D65/78—Features relating to cooling
- F16D65/84—Features relating to cooling for disc brakes
- F16D65/847—Features relating to cooling for disc brakes with open cooling system, e.g. cooled by air
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D69/00—Friction linings; Attachment thereof; Selection of coacting friction substances or surfaces
- F16D69/04—Attachment of linings
- F16D69/0408—Attachment of linings specially adapted for plane linings
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F1/00—Springs
- F16F1/02—Springs made of steel or other material having low internal friction; Wound, torsion, leaf, cup, ring or the like springs, the material of the spring not being relevant
- F16F1/021—Springs made of steel or other material having low internal friction; Wound, torsion, leaf, cup, ring or the like springs, the material of the spring not being relevant characterised by their composition, e.g. comprising materials providing for particular spring properties
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F1/00—Springs
- F16F1/02—Springs made of steel or other material having low internal friction; Wound, torsion, leaf, cup, ring or the like springs, the material of the spring not being relevant
- F16F1/18—Leaf springs
- F16F1/185—Leaf springs characterised by shape or design of individual leaves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D69/00—Friction linings; Attachment thereof; Selection of coacting friction substances or surfaces
- F16D2069/004—Profiled friction surfaces, e.g. grooves, dimples
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D69/00—Friction linings; Attachment thereof; Selection of coacting friction substances or surfaces
- F16D69/04—Attachment of linings
- F16D2069/0425—Attachment methods or devices
- F16D2069/0433—Connecting elements not integral with the braking member, e.g. bolts, rivets
Abstract
The invention discloses a powder metallurgy brake pad for a high-cold high-temperature motor train unit, which comprises a steel backing (1) and a plurality of brake pad assemblies; the steel backing (1) is sequentially provided with a plurality of mounting holes from inside to outside along the radial direction, and each mounting hole is internally provided with a set of brake pad assembly; dish spring (2) are located in locating hole (11), and locating hole (11) one side of steel backing (1) is located in clutch block (3), and clutch block (3) pass dish spring (2) and the middle through-hole of mounting hole, through locating jump ring (4) fixed connection in the recess (13) of opposite side. The existing powder metallurgy brake pad structure is optimized, the friction surface area and the heat dissipation and chip removal channels of the brake pad are increased, the friction surface temperature and the mixing of abrasive dust and foreign matters are reduced, the friction coefficient stability under the high-temperature and high-speed working condition is ensured, the abnormal abrasion of the brake pad and the brake disc under the abnormal weather of ice, snow, wind, sand and the like is avoided, and the braking requirement of the high-speed motor train unit is met.
Description
Technical Field
The invention belongs to the technical field of mechanical structures, particularly relates to the technical field of disc braking, and particularly relates to a powder metallurgy brake pad for a high-cold high-temperature motor train unit.
Background
At present, the high-speed railway of China is rapidly developed, and parts of the high-speed railway are required to keep good stability under complex meteorological conditions, such as ice, snow, damp and hot weather, wind and sand and the like. As a key core component of train braking, the brake pads of the motor train unit realize braking, speed regulation and parking of the train through friction with the brake disc, and the performance of the brake pads of the motor train unit is directly related to the running safety of the train. The existing powder metallurgy brake pad is limited by the design structure, the channels for heat dissipation, chip removal and the like are not smooth, the heat dissipation and chip removal effects are poor, the stable friction coefficient and the good brake disc and sheet state are difficult to ensure, and the application of the powder metallurgy brake pad in a motor train unit with the speed per hour of 400 kilometers or more is limited; the mainstream C/C composite material applied to the aircraft has low friction coefficient under wet working conditions, is easy to oxidize, influences the driving safety of trains, has high cost and is difficult to be widely applied to high-speed motor train units; the carbon-ceramic composite material is a C/C composite material modified by ceramic, so that the problems that the C/C composite material is low in friction coefficient and easy to oxidize under a wet working condition are basically solved, but the defects that the ceramic material is poor in thermal shock resistance, weak in impact resistance, large in abrasion, mismatched in thermal expansion coefficient, uneven in tissue structure and the like of the carbon-ceramic composite material are not fully solved, and large-scale mass production cannot be realized in a short period.
Disclosure of Invention
The invention aims to provide a powder metallurgy brake pad for a high-cold high-temperature motor train unit, which optimizes the structure of the existing powder metallurgy brake pad, increases the friction surface area and a heat dissipation and chip removal channel of the brake pad, reduces the friction surface temperature and the inclusion and accumulation of abrasive dust and external foreign matters, ensures the stability of the friction coefficient under high-temperature and high-speed working conditions, avoids the abnormal abrasion of the brake pad and a brake disc under abnormal weather such as ice, snow, wind, sand and the like, and meets the braking requirement of the high-speed motor train unit.
The technical scheme provided by the invention is as follows:
a powder metallurgy brake pad for a high-cold high-temperature motor train unit comprises a steel backing 1 and a plurality of brake pad assemblies; the steel back 1 is of a fan-shaped split structure and comprises two pieces which are in mirror symmetry with each other; the steel back 1 is sequentially provided with a plurality of mounting holes from inside to outside along the radial direction, and each mounting hole is provided with a set of brake pad assembly;
the brake pad component comprises a disc spring 2, a friction block 3 and a clamp spring 4; the mounting hole is provided with a positioning hole 11 at the assembling side of the steel backing 1, a groove 13 at the other side, and the middle through holes are communicated; the disc spring 2 is arranged in the positioning hole 11, the friction block 3 is arranged on one side of the positioning hole 11 of the steel backing 1, and the friction block 3 penetrates through the disc spring 2 and a middle through hole of the mounting hole and is fixedly connected with the disc spring 2 through a clamp spring 4 arranged in a groove 13 on the other side;
the cross section of the friction blocks 3 is hexagonal, and a plurality of anti-rotation bosses 12 for preventing the friction blocks 3 from rotating are arranged on the steel back 1 between the friction blocks 3.
The friction block 3 comprises a friction body 31 and a back plate 32, and the friction body 31 and the back plate 32 are of an integral sintering structure; the cross section of the back plate 32 is larger than that of the friction body 31.
The back plate 32 comprises a back plate spherical surface 321, and the back plate spherical surface 321 is in contact with the disc spring 2.
The back plate 32 comprises a center pin 322, a T-shaped groove 3221 is arranged at the top end of the center pin 322, and the clamp spring 4 is clamped in the T-shaped groove 3221.
The cross section of the friction block 3 is a non-equilateral hexagon.
The clearance between the friction blocks 3 is not less than 3 mm.
The clearance between the back plate 32 of the friction block 3 and the steel back 1 is not less than 1mm, and is not less than 0.5mm under the maximum braking pressure.
The disc spring 2 is a single disc spring without a supporting surface, the cross section of the disc spring is trapezoidal, the material is precipitation hardening stainless steel, the thickness of the disc spring is 1-1.5 mm, the free height is pressed down by 0.5mm, and the pressure is not lower than 1.0 kN.
According to the technical scheme provided by the invention, the powder metallurgy brake pad for the high-cold high-temperature motor train unit optimizes the existing powder metallurgy brake pad structure, increases the friction surface area and the heat dissipation and chip removal channels of the brake pad, reduces the friction surface temperature and the inclusion and accumulation of abrasive dust and external foreign matters, ensures the friction coefficient stability under high-temperature and high-speed working conditions, avoids the abnormal abrasion of the brake pad and the brake disc under the abnormal weather of ice, snow, wind, sand and the like, and meets the braking requirement of the high-speed motor train unit.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on the drawings without creative efforts.
FIG. 1 is a three-dimensional structure diagram of a powder metallurgy brake pad of a high and cold high-temperature motor train unit provided by an embodiment of the invention;
FIG. 2 is a schematic structural diagram of a powder metallurgy brake pad of the high and cold high-temperature motor train unit provided by the embodiment of the invention in a front view;
FIG. 3 is a schematic sectional view A-A of FIG. 2;
FIG. 4 is a schematic structural diagram of a steel backing of a powder metallurgy brake pad of the high and cold high-temperature motor train unit according to the embodiment of the invention in a front view;
FIG. 5 is a left side view structural schematic diagram of a steel backing of a powder metallurgy brake pad of the high and cold high-temperature motor train unit provided by the embodiment of the invention;
FIG. 6 is a schematic rear view structure diagram of a steel backing of a powder metallurgy brake pad of the high and cold high-temperature motor train unit provided by the embodiment of the invention;
FIG. 7 is a schematic structural diagram of a disc spring of a powder metallurgy brake pad of the high and cold high-temperature motor train unit according to the embodiment of the invention;
FIG. 8 is a schematic structural diagram of a friction block of the powder metallurgy brake pad of the high and cold high-temperature motor train unit according to the embodiment of the invention in a front view;
FIG. 9 is a schematic left-side sectional structure view of a friction block of a powder metallurgy brake pad of the alpine high-temperature motor train unit provided by the embodiment of the invention;
fig. 10 is a schematic structural view of a clamp spring of the powder metallurgy brake pad of the high-cold high-temperature motor train unit provided by the embodiment of the invention.
Detailed Description
The technical solutions in the embodiments of the present invention are clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without making any creative effort, shall fall within the protection scope of the present invention.
Embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.
As shown in fig. 1 to 3, a powder metallurgy brake pad for an alpine high-temperature motor train unit comprises a steel backing 1 and a plurality of brake pad assemblies; as shown in fig. 4 to 6, the steel back 1 is a fan-shaped split structure, and comprises two pieces which are mirror-symmetrical left and right; the steel back 1 is sequentially provided with a plurality of mounting holes from inside to outside along the radial direction, and each mounting hole is provided with a set of brake pad assembly; because the steel backing 1 is fan-shaped and is a part of a circular surface, the radial direction refers to the direction from the center of a circle to the outside. One of the steel backs 1 comprises 9 mounting holes, namely 2, 3 and 4 mounting holes from inside to outside.
The brake pad component comprises a disc spring 2, a friction block 3 and a clamp spring 4; the mounting hole is provided with a positioning hole 11 at the assembling side of the steel backing 1, a groove 13 at the other side, and the middle through holes are communicated; meanwhile, the other side is also provided with a dovetail block for mounting the powder metallurgy brake pad of the high-cold high-temperature motor train unit.
The disc spring 2 is arranged in the positioning hole 11 and is of a structure of the disc spring 2 as shown in fig. 7, the disc spring 2 is a single disc spring without a supporting surface, the cross section of the disc spring is trapezoidal, the disc spring is made of precipitation hardening stainless steel, the thickness of the disc spring is 1-1.5 mm, and the free height is not less than 1.0kN when the disc spring is pressed by 0.5 mm. The bottom circle 21 of the disc spring 2 contacts with the bottom of the positioning hole 11. The friction block 3 is arranged on one side of the positioning hole 11 of the steel back 1, and the friction block 3 penetrates through the disc spring 2 and a middle through hole of the mounting hole and is fixedly connected with the disc spring through a clamp spring 4 arranged in a groove 13 on the other side; the top circle 22 of the disc spring 2 contacts the friction block 3.
As shown in fig. 8 and 9, the cross section of the friction blocks 3 is hexagonal, and a plurality of anti-rotation bosses 12 for preventing the friction blocks 3 from rotating are arranged on the steel back 1 between the friction blocks 3. Ensure that adjacent friction blocks 3 have certain clearance and limit the friction blocks 3 to have certain rotation angle. Specifically, the cross section of the friction block 3 is a non-equilateral hexagon. Specifically, the friction block 3 comprises a friction body 31 and a back plate 32, and the friction body 31 and the back plate 32 are of an integral sintering structure; the cross section of the back plate 32 is larger than that of the friction body 31. The back plate 32 includes a back plate spherical surface 321, and the back plate spherical surface 321 contacts with the disc spring 2, that is, the top circle 22 of the disc spring 2 contacts with the back plate spherical surface 321 of the friction block 3. The back plate 32 includes a center pin 322, a T-shaped groove 3221 is disposed at a top end of the center pin 322, the snap spring 4 is clamped in the T-shaped groove 3221, and specifically, as shown in fig. 10, the center closed hole 41 of the snap spring 4 is clamped in the T-shaped groove 3221 for fixing. The clamp spring 4 is butterfly-shaped and made of stainless steel, the central closed hole 41 is circular or nearly circular, and the wire diameter is not less than 1.5 mm.
And after the assembly is finished, the clearance between the friction blocks 3 is not less than 3 mm. The clearance between the back plate 32 of the friction block 3 and the steel back 1 is not less than 1mm, and is not less than 0.5mm under the maximum braking pressure.
The example is assembled as follows:
placing the disc springs 2 into the positioning holes 11 of the steel backing 1, enabling bottom circles 21 of the disc springs 2 to be overlapped with the positioning holes 11 of the steel backing 1, and repeating the operation until all the disc springs 2 are placed into the positioning holes 11 of the steel backing 1;
the central pin 322 of the friction block 3 sequentially passes through the positioning holes 11 of the disc spring 2 and the steel backing 1 until the spherical surface 321 of the friction block 3 is coincided with the top circle 22 of the disc spring 2, the long edge of the friction block 3 is parallel to the long edge of the anti-rotation boss 12, and the operation is repeated until all the friction blocks 3 are placed at the designated positions;
and pressing the central closed hole 41 of the clamp spring 4 into the T-shaped groove 3221 to fix the friction block 3 on the steel back 1, sinking the T-shaped groove 3221 and the clamp spring 4 into the groove 13 of the steel back 1, and repeating the operations until all the clamp springs 4 are installed.
Its advantages are as follows:
the friction block is of a solid non-equilateral hexagonal structure, so that abrasive dust, rainwater, ice, snow and the like are prevented from being accumulated in the center hole of the friction block, the long side direction of the friction block is consistent with the length direction of the brake pad, the space of the brake pad in the length direction is fully utilized, and a larger friction area is obtained;
the positions of the friction blocks on the steel back are reasonably arranged, gaps of more than 3mm are formed between adjacent friction blocks, the friction area is sequentially increased from inside to outside along the radial direction and is in direct proportion to the square of the friction radius, the temperature of the friction surface of the brake pad and the accumulation of abrasive dust, external foreign matters and the like on the friction surface are reduced, the uniform abrasion of friction materials in the inner edge and the outer edge of the brake pad is ensured, the eccentric abrasion and abnormal abrasion of the brake pad and the brake disc are avoided, the back plate of the friction block is larger than the friction body, the back plate is in contact with an anti-rotation boss of the steel back during rotation;
the friction block is fixed with the steel backing through the disc spring, the clamp spring is connected, elastic contact of the friction block, the steel backing and the disc spring is achieved, the clearance between the friction block backing surface and the steel backing assembling surface is not smaller than 1mm in a free state, the clearance is not smaller than 0.5mm under the maximum braking pressure, the heat dissipation channel of the brake pad and the actual contact area during braking are increased, and the impact force of the brake pad in the moment of braking is reduced.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (8)
1. A powder metallurgy brake pad for a high-cold high-temperature motor train unit is characterized by comprising a steel backing (1) and a plurality of brake pad assemblies; the steel back (1) is of a fan-shaped split structure and comprises two pieces which are in mirror symmetry; the steel backing (1) is sequentially provided with a plurality of mounting holes from inside to outside in the radial direction, and each mounting hole is provided with a set of brake pad assembly;
the brake pad component comprises a disc spring (2), a friction block (3) and a clamp spring (4); the mounting hole is provided with a positioning hole (11) at the assembling side of the steel backing (1), the other side of the mounting hole is provided with a groove (13), and the middle through holes are communicated; the disc spring (2) is arranged in the positioning hole (11), the friction block (3) is arranged on one side of the positioning hole (11) of the steel back (1), and the friction block (3) penetrates through the disc spring (2) and a middle through hole of the mounting hole and is fixedly connected with the disc spring through a clamp spring (4) arranged in a groove (13) on the other side;
the cross section of the friction blocks (3) is hexagonal, and a plurality of anti-rotation bosses (12) for preventing the friction blocks (3) from rotating are arranged on the steel back (1) between the friction blocks (3).
2. The powder metallurgy brake lining for the high-cold high-temperature motor train unit according to claim 1, wherein the friction block (3) comprises a friction body (31) and a back plate (32), and the friction body (31) and the back plate (32) are of an integral sintered structure; the cross section of the back plate (32) is larger than that of the friction body (31).
3. The powder metallurgy brake lining for the high-cold high-temperature motor train unit according to claim 2, wherein the back plate (32) comprises a back plate spherical surface (321), and the back plate spherical surface (321) is in contact with the disc spring (2).
4. The powder metallurgy brake lining for the high and cold high-temperature motor train unit as claimed in claim 2, wherein the back plate (32) comprises a center pin (322), a T-shaped groove (3221) is formed in the top end of the center pin (322), and the clamp spring (4) is clamped in the T-shaped groove (3221).
5. The powder metallurgy brake lining for the high-cold high-temperature motor train unit according to claim 1, wherein the cross section of the friction block (3) is a non-equilateral hexagon.
6. The powder metallurgy brake lining for the high and cold high-temperature motor train unit according to claim 1, 2, 3, 4 or 5, wherein the clearance between the friction blocks (3) is not less than 3 mm.
7. The powder metallurgy brake lining for the high and cold high temperature motor train unit according to claim 1, 2, 3, 4 or 5, wherein the clearance between the back plate (32) of the friction block (3) and the steel backing (1) is not less than 1mm, and is not less than 0.5mm under the maximum braking pressure.
8. The powder metallurgy brake lining of the high and cold high-temperature motor train unit according to claim 1, 2, 3, 4 or 5, wherein the disc spring (2) is a single disc spring without a supporting surface, the cross section of the disc spring is trapezoidal, the material is precipitation hardening stainless steel, the thickness of the disc spring is 1-1.5 mm, the free height is pressed down by 0.5mm, and the pressure is not lower than 1.0 kN.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010727804.7A CN111692254A (en) | 2020-07-24 | 2020-07-24 | Powder metallurgy brake pad for high-cold high-temperature motor train unit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010727804.7A CN111692254A (en) | 2020-07-24 | 2020-07-24 | Powder metallurgy brake pad for high-cold high-temperature motor train unit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111692254A true CN111692254A (en) | 2020-09-22 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010727804.7A Pending CN111692254A (en) | 2020-07-24 | 2020-07-24 | Powder metallurgy brake pad for high-cold high-temperature motor train unit |
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| Country | Link |
|---|---|
| CN (1) | CN111692254A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113048172A (en) * | 2021-03-25 | 2021-06-29 | 博深股份有限公司 | Motor train unit brake lining with large gap |
-
2020
- 2020-07-24 CN CN202010727804.7A patent/CN111692254A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113048172A (en) * | 2021-03-25 | 2021-06-29 | 博深股份有限公司 | Motor train unit brake lining with large gap |
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