CN111075871A - A powder metallurgy brake pad for train - Google Patents
A powder metallurgy brake pad for train Download PDFInfo
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- CN111075871A CN111075871A CN202010015209.0A CN202010015209A CN111075871A CN 111075871 A CN111075871 A CN 111075871A CN 202010015209 A CN202010015209 A CN 202010015209A CN 111075871 A CN111075871 A CN 111075871A
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- brake pad
- steel back
- dovetail
- powder metallurgy
- plate
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- 238000004663 powder metallurgy Methods 0.000 title claims abstract description 22
- 241000357293 Leptobrama muelleri Species 0.000 claims abstract description 65
- 229910000831 Steel Inorganic materials 0.000 claims description 34
- 239000010959 steel Substances 0.000 claims description 34
- 239000002184 metal Substances 0.000 claims description 20
- 238000000034 method Methods 0.000 claims description 14
- 238000010276 construction Methods 0.000 claims 1
- 238000003754 machining Methods 0.000 description 11
- 238000005242 forging Methods 0.000 description 6
- 238000003466 welding Methods 0.000 description 4
- 238000009434 installation Methods 0.000 description 3
- 238000005266 casting Methods 0.000 description 2
- 230000005484 gravity Effects 0.000 description 2
- 230000007774 longterm Effects 0.000 description 2
- 238000005245 sintering Methods 0.000 description 2
- 101100346177 Arabidopsis thaliana MORC5 gene Proteins 0.000 description 1
- 241000271559 Dromaiidae Species 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
Images
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
- 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
- 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
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Braking Arrangements (AREA)
Abstract
一种列车用粉末冶金制动闸片，包括左钢背、右钢背、N个摩擦块、N个弹簧卡扣；所述左钢背上设置有左燕尾板，所述右钢背上设置有右燕尾板；所述摩擦块包括背板和摩擦体；N个所述摩擦块分别安装在所述左钢背和所述右钢背的无燕尾侧平面上；所述左钢背和所述右钢背的无燕尾侧平面上共设置有N个限位凸台，每个所述摩擦块的所述背板上设置有限位凹槽；每个所述限位凹槽嵌装入每个所述限位凸台上并呈间隙配合。本发明制动闸片在列车制动使用过程中，摩擦块受限位凸台约束，只有微小转动,可靠性高，摩擦块磨耗到限后，摩擦块拆卸比较方便。
A powder metallurgy brake pad for trains comprises a left steel back, a right steel back, N friction blocks and N spring clips; a left dovetail plate is arranged on the left steel back, and a left dovetail plate is arranged on the right steel back There is a right dovetail plate; the friction block includes a back plate and a friction body; N pieces of the friction block are respectively installed on the dovetail-free side planes of the left steel back and the right steel back; the left steel back and all A total of N limit bosses are arranged on the dovetail-free side plane of the right steel back, and a limit groove is arranged on the back plate of each of the friction blocks; each of the limit grooves is embedded in each Each of the limiting bosses is in clearance fit. When the brake pad of the invention is used for train braking, the friction block is restricted by the limited position boss, only rotates slightly, and has high reliability. After the friction block is worn to the limit, the friction block is easy to disassemble.
Description
Technical Field
The invention relates to a brake pad for a train, in particular to a powder metallurgy brake pad for a train with the speed per hour of 160 and 250 kilometers.
Background
In the existing powder metallurgy brake pad for 160-inch 250km motor train unit vehicles, the dovetails and the steel backs are mostly in split structures and are connected together by adopting a riveting process or a welding process; the connection of the brake friction block and the steel backing also adopts a riveting process. The process is complex, and the brake friction block is inconvenient to disassemble after the abrasion reaches the limit. The brake pad in the connection mode has the potential risk of rivet or welding seam breakage failure, and the dovetail plate and the steel backing are easily peeled off and fall off in the running process of the train, so that potential safety hazards are caused to the train.
CN201310460684.9 discloses a powder metallurgy brake lining that CRH5 type EMUs were used, steel backing plate and forked tail piece adopt the riveting method to connect, stop through 15 split pins simultaneously, and it has following problem:
1. the thickness of the dovetail block is single and thin (about 3mm) and no reinforcing rib is arranged, so that the dovetail block is easy to deform in the use process, and the brake lining falls off from the clamp; in addition, the dimensional accuracy of the dovetail plate subjected to the press working cannot be ensured.
2. The steel back plate and the dovetail block as well as the steel back plate and the brake pad friction body are connected by riveting, the riveting times are more, the process is complex, the efficiency is low, and the riveting is easy to lose efficacy.
3. The cotter pin is easy to lose efficacy.
CN201621478794.3 discloses a dovetail steel backing integrated powder metallurgy brake pad for a motor train unit with a speed per hour of 160-250 kilometers, which comprises a dovetail steel backing, N brake pad friction plates and N butterfly-shaped snap springs; each brake pad friction plate is of a triangular structure, a positioning pin is arranged at a position close to each vertex, the length of two positioning pins is consistent with the thickness of the dovetail-shaped steel back, the length of the other positioning pin is greater than the thickness of the dovetail-shaped steel back, and a groove is further formed in the exceeding part of the positioning pin; the dovetail-shaped steel back is provided with 3N positioning holes, the brake pad friction plates are distributed on the dovetail-shaped steel back in a staggered mode, the positioning pin of each brake pad friction plate extends into the corresponding positioning hole in the dovetail-shaped steel back, and the positioning pin with the groove is matched and clamped with the butterfly clamp spring. The two short positioning pins are used for stopping rotation, the two short positioning pins are arranged on the back plate, the thickness of the back plate is thinner (about 3mm), the matching surface of the short positioning pins and the back plate is smaller, and the short positioning pins and the back plate are easy to fatigue and lose efficacy and are loosened in the long-term braking use process of the brake pad; in addition, the long positioning pin is arranged at the vertex position of the triangular back plate, belongs to offset installation, and is easy to fall off due to the fact that the friction block can be subjected to large impact vibration due to uneven stress in the long-term driving process.
Disclosure of Invention
The invention aims to solve the technical problem of overcoming the defects in the prior art and provide the powder metallurgy brake pad for the train, which has high rotation stopping reliability and convenient disassembly of a friction block after the friction block is worn to the limit.
The technical scheme adopted by the invention for solving the technical problems is as follows: a powder metallurgy brake pad for a train comprises a left steel backing, a right steel backing, N friction blocks and N spring buckles; the left steel back is provided with a left dovetail plate, and the right steel back is provided with a right dovetail plate; the friction block comprises a back plate and a friction body; the N friction blocks are respectively arranged on the dovetail-free side planes of the left steel back and the right steel back; n limiting bosses are arranged on dovetail-free side planes of the left steel back and the right steel back, and a limiting groove is arranged on the back plate of each friction block; each limiting groove is embedded into each limiting boss in a clearance fit mode.
Furthermore, the limiting groove is of a triangle-like structure, and the corresponding limiting boss is of a triangle-like structure.
Furthermore, the limiting groove is of a quadrilateral-like structure, and the corresponding limiting boss is of a quadrilateral-like structure; the limiting groove is preferably of a similar rectangular structure or a similar square structure, and the corresponding limiting boss is preferably of a similar rectangular structure or a similar square structure.
Further, the limiting groove is of a regular pentagon-like structure or a regular hexagon-like structure, and the limiting boss is preferably of a regular pentagon-like structure or a regular hexagon-like structure.
Further, the matching clearance between the limiting groove and the side part of the limiting boss is 0.1-2mm (preferably 0.2-1 mm).
Further, the depth of the limiting groove is larger than or equal to the height of the limiting boss, and the gap between the bottom of the limiting groove and the top of the limiting boss is 0-1mm (preferably 0.1-0.6 mm).
Furthermore, a pin shaft is arranged at the center of the back plate, and an annular clamping groove is formed in the end part of the pin shaft; the pin shaft extends into corresponding mounting holes in the left steel back and the right steel back respectively, and the friction block is fixed on the left steel back and the right steel back through the annular clamping groove and the spring fastener.
Furthermore, the back plate is of an integral structure, and is formed by integrally forming through hot forging and pressing and then machining the end part of the pin shaft and the annular clamping groove.
Further, the friction block is formed by integrally sintering the back plate and the friction body.
Further, the friction block is of a triangle-like structure, preferably an equilateral triangle-like structure.
Further, the value of N is one of 6, 8, 10, 12 and 14, and 8, 10 and 12 are preferred.
Further, the left steel backing and the left dovetail plate are of an integrated metal structure; the right steel back and the right dovetail plate are of an integrated metal structure.
Further, the left steel backing and the left dovetail plate may be cast or forged or steel plate machined into an integral metal structure; the right steel backing and the right dovetail plate may be cast or forged or machined from steel plate as a unitary metal structure.
Compared with the prior art, the invention has the following beneficial effects:
(1) the limiting groove of the brake pad is embedded into the limiting boss to form clearance fit, and the friction block is restrained by the limiting boss and cannot rotate greatly in the braking use process of a train; the rotation stopping structure has higher reliability than the rotation stopping of the split pin or the pin shaft.
(2) The left steel back and the left dovetail plate of the brake pad are of an integrated metal structure, and the right steel back and the right dovetail plate are of an integrated metal structure; the integrated metal structure design of the steel back and the dovetail plate is higher in reliability than the riveting structure or the welding structure design.
(3) A pin shaft is arranged at the central position of the back plate, and the spring buckle clamps the annular clamping groove of the pin shaft; the stress point of the spring buckle is positioned at the gravity center position of the friction block, and the spring buckle is uniformly stressed and is not easy to fall off in comparison with offset installation, so that the reliability is high. In addition, the friction block is more convenient to disassemble than a riveting structure after being worn to the limit.
Drawings
FIG. 1 is a front view of an embodiment 1 of a powder metallurgy brake pad for a train in accordance with the present invention;
FIG. 2 is a left side view of embodiment 1 shown in FIG. 1;
FIG. 3 is a sectional view taken along line I-I of FIG. 1;
FIG. 4 is a perspective view of embodiment 1 shown in FIG. 1;
FIG. 5 is a schematic view of the friction block structure of embodiment 1 shown in FIG. 1;
FIG. 6 is a schematic view of a back plate structure of embodiment 1 shown in FIG. 1;
FIG. 7 is a schematic view of the dovetail-free side plan structure of the left steel backing of example 1 shown in FIG. 1;
FIG. 8 is a schematic side view of the left steel backing dovetail of example 1 of FIG. 1;
FIG. 9 is a schematic view of the right steel backing dovetail-free side plan structure of example 1 shown in FIG. 1;
FIG. 10 is a side view of the right steel backing dovetail of example 1 of FIG. 1;
fig. 11 is a schematic structural view of the spring clip of embodiment 1 shown in fig. 1.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples.
Example 1
Referring to the attached drawings, the powder metallurgy brake pad for the train comprises a left steel back 1, a right steel back 2, 10 friction blocks 3 and 10 spring buckles 4; the left steel back 1 is provided with a left dovetail plate 11, and the right steel back 2 is provided with a right dovetail plate 21; the friction block 3 comprises a back plate 31 and a friction body 32; the 10 friction blocks 3 are respectively arranged on the dovetail-free side planes of the left steel back 1 and the right steel back 2; the dovetail-free side planes of the left steel back 1 and the right steel back 2 are provided with 10 limiting bosses 5, and the back plate 31 of each friction block 3 is provided with a limiting groove 311; each limiting groove 311 is embedded into each limiting boss 5 to be in clearance fit; the fit clearance between the limiting groove 311 and the side part of the limiting boss 5 is 0.5 mm; the depth of the limiting groove 311 is greater than or equal to the height of the limiting boss 5, and the gap between the bottom of the limiting groove 311 and the top of the limiting boss 5 is 0.4 mm.
The limiting groove 311 is of an equilateral triangle structure, and the corresponding limiting boss 5 is of an equilateral triangle structure.
A pin shaft 312 is arranged at the center of the back plate 31, and an annular clamping groove 313 is arranged at the end part of the pin shaft 312; the pin shaft 312 extends into the corresponding mounting holes 51 in the left steel back 1 and the right steel back 2 respectively, and the friction block 3 is fixed on the left steel back 1 and the right steel back 2 through the annular clamping groove 313 and the spring buckle 4.
The back plate 31 is of an integral structure and is manufactured by a method of integrally forming by hot forging and then machining the end of the pin shaft 312 and the annular clamping groove 313.
The friction block 3 is formed by integrally sintering the back plate 31 and the friction body 32, and the friction block has a 3-class equilateral triangle structure.
The left steel backing 1 and the left dovetail plate 11 are integrated metal structures formed by machining after casting; the right steel backing 2 and the right dovetail plate 21 are integrated metal structures machined and formed after casting.
In the embodiment, the limit groove 311 of the powder metallurgy brake pad for the train is embedded in the limit boss 5 to be in clearance fit, and the friction block 3 is restrained by the limit boss 5 and cannot rotate greatly in the braking use process of the train; the rotation stopping structure has higher reliability than the rotation stopping of the split pin or the pin shaft; the integrated metal structure of the steel back and the dovetail plate has higher reliability than a riveting structure or a welding structure.
In addition, the central position of the back plate 31 of the brake pad of this embodiment is provided with a pin shaft 312, and the annular clamping groove 313 is tightly matched and clamped with the spring buckle 4; the stress point of the spring buckle 4 is positioned at the gravity center position of the friction block 3, and the spring buckle is uniformly stressed and is not easy to fall off in comparison with offset installation, so that the reliability is high; after the friction block 3 is abraded to the limit, the friction block 3 is more convenient to disassemble than a riveting structure.
Example 2
The difference between the embodiment and the embodiment 1 is only that 8 friction blocks 3 and 8 spring buckles 4 are provided, and 8 limiting bosses 5 are provided on the dovetail-free side planes of the left steel back 1 and the right steel back 2. The fit clearance between the limiting groove 311 and the side part of the limiting boss 5 is 1.0 mm; the gap between the bottom of the limiting groove 311 and the top of the limiting boss 5 is 0.6 mm. The limiting groove 311 is of a similar rectangular structure, and corresponds to the limiting boss 5. The left steel backing 1 and the left dovetail plate 11 are of an integrated metal structure formed by machining after forging; the right steel backing 2 and the right dovetail plate 21 are of an integrated metal structure formed by machining after forging.
The rest is the same as example 1.
Example 3
The difference between the embodiment and the embodiment 1 is only that 12 friction blocks 3 and 12 spring buckles 4 are provided, and 12 limiting bosses 5 are provided on the dovetail-free side planes of the left steel back 1 and the right steel back 2. The matching clearance between the limiting groove 311 and the side part of the limiting boss 5 is 2.0 mm; the gap between the bottom of the limiting groove 311 and the top of the limiting boss 5 is 1.0 mm. The limiting groove 311 is of a square-like structure, and the corresponding limiting boss 5 is of a square-like structure. The left steel backing 1 and the left dovetail plate 11 are integrated metal structures formed by machining steel plates; the right steel backing 2 and the right dovetail plate 21 are integrated metal structures formed by machining steel plates.
The rest is the same as example 1.
Example 4
The difference between the embodiment and the embodiment 1 is only that 6 friction blocks 3 and 6 spring buckles 4 are provided, and 6 limiting bosses 5 are provided on the dovetail-free side planes of the left steel back 1 and the right steel back 2. The fit clearance between the limiting groove 311 and the side part of the limiting boss 5 is 1.5 mm; the gap between the bottom of the limiting groove 311 and the top of the limiting boss 5 is 0.8 mm. The limiting groove 311 is of a quasi-regular pentagon structure, and the corresponding limiting boss 5 is of a quasi-regular pentagon structure.
The rest is the same as example 1.
Example 5
The difference between the embodiment and the embodiment 1 is only that 14 friction blocks 3 and 14 spring buckles 4 are provided, and 14 limiting bosses 5 are provided on the dovetail-free side planes of the left steel back 1 and the right steel back 2. The fit clearance between the limiting groove 311 and the side part of the limiting boss 5 is 0.2 mm; the gap between the bottom of the limiting groove 311 and the top of the limiting boss 5 is 0.1 mm. The limiting groove 311 is of a regular hexagon-like structure, and the corresponding limiting boss 5 is of a regular hexagon-like structure. The left steel backing 1 and the left dovetail plate 11 are of an integrated metal structure formed by machining after forging; the right steel backing 2 and the right dovetail plate 21 are of an integrated metal structure formed by machining after forging.
The rest is the same as example 1.
Example 6
The difference between the embodiment and the embodiment 1 is only that 12 friction blocks 3 and 12 spring buckles 4 are provided, and 12 limiting bosses 5 are provided on the dovetail-free side planes of the left steel back 1 and the right steel back 2. The fit clearance between the limiting groove 311 and the side part of the limiting boss 5 is 0.1 mm; the gap between the bottom of the limiting groove 311 and the top of the limiting boss 5 is 0 mm. The limiting groove 311 is of a rhomboid structure, and the corresponding limiting boss 5 is of a rhomboid structure. The left steel backing 1 and the left dovetail plate 11 are integrated metal structures formed by machining steel plates; the right steel backing 2 and the right dovetail plate 21 are integrated metal structures formed by machining steel plates.
The rest is the same as example 1.
Example 7
The difference between this embodiment and embodiment 1 is only that the fitting clearance between the limiting groove 311 and the side of the limiting boss 5 is 0.8 mm; the gap between the bottom of the limiting groove 311 and the top of the limiting boss 5 is 0.5 mm. The limiting groove 311 is of an isosceles right triangle-like structure, and the corresponding limiting boss 5 is of an isosceles right triangle-like structure.
The rest is the same as example 1.
Example 8
The difference between the embodiment and the embodiment 1 is only that 12 friction blocks 3 and 12 spring buckles 4 are provided, and 12 limiting bosses 5 are provided on the dovetail-free side planes of the left steel back 1 and the right steel back 2. The matching clearance between the limiting groove 311 and the side part of the limiting boss 5 is 1.8 mm; the gap between the bottom of the limiting groove 311 and the top of the limiting boss 5 is 0.9 mm. The limiting groove 311 is of an isosceles triangle-like structure, and the corresponding limiting boss 5 is of an isosceles triangle-like structure.
The rest is the same as example 1.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and all modifications, alterations and equivalent structural changes made to the above embodiments according to the technical spirit of the present invention still belong to the protection scope of the technical solution of the present invention.
Claims (10)
1. A powder metallurgy brake pad for a train comprises a left steel backing (1), a right steel backing (2), N friction blocks (3) and N spring buckles (4); a left dovetail plate (11) is arranged on the left steel back (1), and a right dovetail plate (21) is arranged on the right steel back (2); the friction block (3) comprises a back plate (31) and a friction body (32); the N friction blocks (3) are respectively arranged on the dovetail-free side planes of the left steel back (1) and the right steel back (2); the method is characterized in that: n limiting bosses (5) are arranged on dovetail-free side planes of the left steel back (1) and the right steel back (2), and a limiting groove (311) is arranged on the back plate (31) of each friction block (3); each limiting groove (311) is embedded into the limiting boss (5) in a clearance fit mode.
2. The powder metallurgy brake pad for trains as claimed in claim 1, wherein the limiting groove (311) is of a triangle-like structure, and the limiting boss (5) is of a triangle-like structure.
3. The powder metallurgy brake pad for trains as claimed in claim 1, wherein the limiting groove (311) is of a quadrilateral-like structure, and the limiting boss (5) is of a quadrilateral-like structure.
4. The powder metallurgy brake pad for trains according to one of claims 1 to 3, wherein the side fitting clearance of the limiting groove (311) and the limiting boss (5) is 0.1-2 mm.
5. The powder metallurgy brake pad for trains according to one of claims 1 to 3, wherein the depth of the limiting groove (311) is greater than or equal to the height of the limiting boss (5), and the clearance between the bottom of the limiting groove (311) and the top of the limiting boss (5) is 0-1 mm.
6. The powder metallurgy brake pad for trains according to one of claims 1 to 5, wherein a pin (312) is arranged at the center of the back plate (31), and an annular clamping groove (313) is arranged at the end part of the pin (312); the pin shaft (312) extends into corresponding mounting holes (51) in the left steel back (1) and the right steel back (2) respectively, and the friction block (3) is fixed on the left steel back (1) and the right steel back (2) through the annular clamping groove (313) and the spring buckle (4).
7. Powder metallurgy brake pad for trains according to one of claims 1 to 5, characterized in that the friction block (3) is integrally sintered and formed by the back plate (31) and the friction body (32).
8. Powder metallurgy brake pad for trains according to one of claims 1 to 5, characterized in that the friction block (3) is of a triangle-like structure.
9. The powder metallurgy brake pad for trains according to one of claims 1 to 5, wherein N takes one of values of 6, 8, 10, 12 and 14.
10. Powder metallurgy brake pad for trains according to one of claims 1 to 5, characterized in that the left steel backing (1) and the left dovetail plate (11) are of one-piece metal construction; the right steel backing (2) and the right dovetail plate (21) are of an integrated metal structure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010015209.0A CN111075871A (en) | 2020-01-07 | 2020-01-07 | A powder metallurgy brake pad for train |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010015209.0A CN111075871A (en) | 2020-01-07 | 2020-01-07 | A powder metallurgy brake pad for train |
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| CN111075871A true CN111075871A (en) | 2020-04-28 |
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| CN202010015209.0A Withdrawn CN111075871A (en) | 2020-01-07 | 2020-01-07 | A powder metallurgy brake pad for train |
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| CN (1) | CN111075871A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112253661A (en) * | 2020-10-26 | 2021-01-22 | 山东菏泽德通新材料科技有限公司 | Novel swallow-tailed motor train unit powder metallurgy brake pad |
| CN113883190A (en) * | 2020-07-03 | 2022-01-04 | 克诺尔轨道车辆系统有限公司 | Brake shoe for rail vehicle and brake shoe device |
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| CN109322949A (en) * | 2018-10-10 | 2019-02-12 | 北京瑞斯福高新科技股份有限公司 | A powder metallurgy brake pad for a dovetail steel-back integrated standard EMU |
| CN110375018A (en) * | 2019-06-24 | 2019-10-25 | 中国科学院山西煤炭化学研究所 | A kind of bullet train brake pad and its installation method |
| CN211574115U (en) * | 2020-01-07 | 2020-09-25 | 湖南城际科技有限公司 | Powder metallurgy brake pad for train |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113883190A (en) * | 2020-07-03 | 2022-01-04 | 克诺尔轨道车辆系统有限公司 | Brake shoe for rail vehicle and brake shoe device |
| CN112253661A (en) * | 2020-10-26 | 2021-01-22 | 山东菏泽德通新材料科技有限公司 | Novel swallow-tailed motor train unit powder metallurgy brake pad |
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