CN203548663U - Powder metallurgy brake pad for CRH5 multiple unit trains - Google Patents

Powder metallurgy brake pad for CRH5 multiple unit trains Download PDF

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Publication number
CN203548663U
CN203548663U CN201320613312.0U CN201320613312U CN203548663U CN 203548663 U CN203548663 U CN 203548663U CN 201320613312 U CN201320613312 U CN 201320613312U CN 203548663 U CN203548663 U CN 203548663U
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CN
China
Prior art keywords
friction piece
hole
brake lining
backing plate
steel backing
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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.)
Withdrawn - After Issue
Application number
CN201320613312.0U
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Chinese (zh)
Inventor
冯友琴
黄启镇
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BEIJING PURAN RAILWAY TRANSPORTATION TECHNOLOGY Co Ltd
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BEIJING PURAN RAILWAY TRANSPORTATION TECHNOLOGY Co Ltd
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Priority to CN201320613312.0U priority Critical patent/CN203548663U/en
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Abstract

The utility model relates to a powder metallurgy brake pad for CRH5 multiple unit trains. The powder metallurgy brake pad is characterized in that the powder metallurgy brake pad comprises five brake pad friction bodies, a dovetail block, a steel back plate, five rivets, five big washers, five small washers, five butterfly elastic sheets, fifteen cotter pins and six flush head rivets. The five brake pad friction bodies are fixed on the front of the steel back plate, and each five brake pad friction body is composed of an equilateral triangle-shaped friction body skeleton with three arc-shaped chamfers and a friction body. The section of the dovetail block is shaped like a W-shaped long plate structure, the steel back plate is of an irregular hexagon-shaped plate structure, the back of the steel back plate is connected with the dovetail block, the five brake pad friction bodies are riveted at intervals on the front of the steel back plate through the big washers, the small washers and the butterfly elastic sheets, one end of each cotter pin is connected with one pin hole of the steel back plate by pin joint, and the other ends of the cotter pins are respectively correspondingly suspended in a guide hole of each friction body skeleton. The upper edge, the lower edge and the arc-shaped edge of the steel back plate are provided with auxiliary holes.

Description

The powder metallurgy brake pad that CRH5 EMUs are used
Technical field
The utility model relates to a kind of brake lining, particularly about a kind of, can meet the powder metallurgy brake pad that speed per hour is used at the CRH5 EMUs of 200-250km/h friction catch.
Background technique
At present, existing rail motor set vehicle is the powder metallurgy brake pad friction piece at 200~250km/h for speed per hour, to adopt the integral sintered technique of riveting on steel backing that is fitted on steel backing or friction piece mostly, steel backing all adopts welding technique to be connected with dovetails, its technique is fairly simple, has also saved cost.But because the thickness of steel backing is only 3mm, during welding, steel backing very easily produces thermal distortion, also have residual stress to exist simultaneously, the rubbing surface that directly has influence on thus brake lining and brake disc laminating is uneven, and between steel backing and friction piece, be not provided with again gap adjustment amount, when contact that brake lining is subject to rotating from brake disc, and then cause surface of contact discontinuity, and affect the stability of braking ability, cause guaranteeing the evenly diffusion in brake pad of fricative heat energy, the part overload that directly has influence on rubbing surface is overheated, thereby cause that brake lining surface produces hot crack, because contact surface is uneven, also wound that can accelerated wear test is hit motion and the wearing and tearing that increase material.
Summary of the invention
For the problems referred to above, it is smooth that the purpose of this utility model is to provide a kind of friction piece surface of contact, by regulating, can make frictional force reach balance, and it is even to bear pressure approximately constant, the powder metallurgy brake pad of using with the CRH5 EMUs of braking device matched swaps.
For achieving the above object, the utility model is taked following technological scheme:
The powder metallurgy brake pad that CRH5 EMUs are used, is characterized in that: it comprises 5 brake lining friction pieces, a dovetails, a Steel Backing Plate, 5 rivets, 5 large pads, 5 minipads, 5 butterfly shell fragments, 15 cotter pins and 6 flathead rivets;
5 described brake lining friction pieces are fastenedly connected the front portion at described Steel Backing Plate, described in each, brake lining friction piece comprises that one has the equilateral triangle friction piece skeleton of three arc anglings, and one is arranged on described friction piece skeleton upper surface and the friction piece identical with described friction piece frame configuration; The center of described friction piece skeleton is provided with a step hole, on three arc anglings of described friction piece skeleton, be provided with a pilot hole, described friction piece skeleton wherein described in one the bilateral symmetry of pilot hole and described step hole line be provided with a pair of recessed material grasping hole; The step hole of the center hole of described friction piece and described friction piece skeleton connects; Described dovetails is fastenedly connected the back at described Steel Backing Plate, described dovetails is the long slab structure that sectional shape is W type, described dovetails middle part is a trapezoid boss, bilateral symmetry is a trapezoidal groove, described in each, on low groove, be interval with three through holes, described in each, the outer wing limit of groove is all spaced apart is provided with two gap;
Described Steel Backing Plate is an irregular hexagonal plank frame, and the middle part correspondence of described Steel Backing Plate is provided with the two rows taper hole corresponding with the through hole of described dovetails; Periphery at the described taper hole of two rows is provided with 5 for being fixedly connected with the concave station hole of described brake lining friction piece according to the distribution correspondence between the form structure of brake lining friction piece described in each and 5 described brake lining friction pieces, and the periphery in concave station hole is provided with the pin joint hole corresponding with three described pilot holes on friction piece skeleton described in each described in each, the auxiliary hole that is provided with a mounting fixture location use at upper and lower edge and the curved edge of described Steel Backing Plate;
Described rivet, large pad, minipad, butterfly shell fragment are with cotter pin the link that is connected described brake lining friction piece, and the stage casing of described rivet is thick axle, and latter end is thin axle; Described butterfly shell fragment is cone barrel type structure, and its upper end is young, and lower end mouth is large; Described in each, the end of rivet is successively through after the center hole of described brake lining friction piece, large pad, minipad, butterfly shell fragment, respectively brake lining friction piece described in each is riveted on each concave station hole of described Steel Backing Plate, and described minipad is placed in the upper end-hole of described butterfly shell fragment, described large pad is placed in the lower end mouth of described butterfly shell fragment; Described cotter pin is a cylindrical structure, is all connected with one end of cotter pin described in each pin joint hole of described Steel Backing Plate, and the other end of described cotter pin is suspended in each pilot hole of friction piece skeleton described in each;
Described flathead rivet end cap is provided with the frustum coordinating with the taper hole of described Steel Backing Plate, and the end of described flathead rivet is radially provided with a shrinkage pool; Described in each, the end of flathead rivet, respectively through after the taper hole of described Steel Backing Plate and the through hole of described dovetails, is riveted on described Steel Backing Plate back by described dovetails.
The material grasping hole of described friction piece skeleton is at least more than two, the employing powder metallurgy integrated die-casting sinter molding of described friction piece.
Described dovetails adopts steel plate punched once-through.
Described Steel Backing Plate adopts steel plate to process, and described cotter pin adopts steel plate to roll and forms.
The lower end mouth of described butterfly shell fragment and described large pad abut on described friction piece skeleton, described large pad internal diameter is set on the thick axle of described rivet, the upper end-hole of described butterfly shell fragment and described minipad abut on described Steel Backing Plate, and described minipad internal diameter is set on the thin axle of described rivet.
The height of described dish-shaped shell fragment is 3mm, and described dish-shaped shell fragment adopts Steel Spring Plate to process.
Gap described in each between brake lining friction piece and described Steel Backing Plate is that the resiliently deformable by described dish-shaped shell fragment regulates, described in each, brake lining friction piece upper surface forms three face structures, the pilot hole degree of depth of described friction piece skeleton is 5mm, when brake lining friction piece is subject to external force, the cotter pin being suspended in the pilot hole of friction piece skeleton described in each is that leg supports, and described in each, cotter pin is again expansion pin simultaneously.
The utility model is owing to taking above technological scheme, it has the following advantages: the brake lining friction piece that 1, the utility model adopts is owing to mating completely with CRH5 EMUs braking system, therefore can meet CRH5 EMUs usage requirement, braking is completely reliable, it is convenient to change, and can also reduce user cost simultaneously.2, friction piece of the present utility model is owing to being by 5 triangle brake lining friction pieces independently, its brake lining friction piece adopts rivet through large pad, minipad, dish-shaped shell fragment and Steel Backing Plate, to rivet successively with being connected of steel backing, between brake lining friction piece and Steel Backing Plate owing to being provided with dish-shaped shell fragment, after riveted joint, be formed with the adjustable clearance of 3mm, therefore when brake lining friction piece is subject to external force, brake lining friction piece is vacant state after having riveted, and can be out of shape to regulate by dish-shaped shell fragment uniform stressed and the steadiness of brake lining friction piece.3, the utility model forms a face because each brake lining friction piece upper surface is at 3, the fixing of brake lining friction piece is to complete by rivet completely, its each brake lining friction piece space is all smaller, the other end correspondence of each cotter pin of riveting in the pin joint hole of Steel Backing Plate is suspended in the pilot hole of each brake lining friction piece, brake lining friction piece does not contact with cotter pin, when brake lining friction piece bears external force, be that leg supports, cotter pin is simultaneously again expansion pin, therefore in braking process, being conducive to braking force distribution ratio makes brake lining friction piece upper surface stressed evenly, can also effectively prevent the rotation of each brake lining friction piece and become flexible.4, because the connection in brake lining friction piece and dovetails all adopts, full riveting method connects Steel Backing Plate to the utility model, therefore the distortion that can avoid the thermal distortion that produces due to welding and thermal stress to cause, and then cause the uneven defect of brake lining friction piece upper surface, guarantee that traffic safety is reliable.The utility model can be widely used in the braking system of different kinds of railways vehicle and EMU.
Accompanying drawing explanation
Fig. 1 is structural representation of the present utility model
Fig. 2 is that schematic diagram is looked on the right side of Fig. 1
Fig. 3 is the schematic top plan view of Fig. 1
Fig. 4 is the schematic rear view of Fig. 1
Fig. 5 is the local connection diagram of Fig. 1
Fig. 6 is A-A sectional view of Fig. 5
Fig. 7 is B-B sectional view of Fig. 5
Fig. 8 is brake lining friction piece structural representation of the present utility model
Fig. 9 is C-C sectional view of Fig. 8
Figure 10 is rivet arrangement schematic diagram of the present utility model
Figure 11 is dish-shaped elastic piece structure schematic diagram of the present utility model
Figure 12 is flathead rivet structural representation of the present utility model
Embodiment
Below in conjunction with drawings and Examples, to of the present utility model, be described in detail.
As shown in Fig. 1~Fig. 7, the utility model comprises 5 brake lining friction pieces 1, a dovetails 2,7,15 cotter pins 8 of 6,5 butterfly shell fragments of 5,5 minipads of 4,5 large pads of 3,5 rivets of a Steel Backing Plate and 6 flathead rivets 9.
As shown in Fig. 5, Fig. 8, Fig. 9,5 brake lining friction pieces 1 of the present utility model are fastenedly connected the front portion at Steel Backing Plate 3, each brake lining friction piece 1 comprises that one has the equilateral triangle friction piece skeleton 11 of three arc anglings, and one is arranged on friction piece skeleton 11 upper surfaces and the friction piece 12 identical with friction piece skeleton 11 shapes.Friction piece skeleton 11 center is provided with a step hole 13, on three arc anglings of friction piece skeleton 11, be provided with a pilot hole 14, friction piece skeleton 11 wherein a pilot hole 14 be provided with a pair of recessed material grasping hole 15 with the bilateral symmetry of step hole 13 lines.The center hole 16 of friction piece 12 is provided with one and connects with the step hole 13 of friction piece skeleton 11.In the present embodiment, friction piece 12 is by powder metallurgy integrated die-casting sinter molding.
As shown in Fig. 4, Fig. 7, dovetails 2 of the present utility model is fastenedly connected the back at Steel Backing Plate 3, dovetails 2 is the long slab structure of W type for sectional shape, adopt steel plate punched once-through, its middle part is a trapezoid boss 21, bilateral symmetry is a trapezoidal groove 22,23, on each groove 22,23, is interval with three through holes 24, all spaced apartly on the outer wing limit of each groove 22,23 is provided with two gap 25.
As shown in Fig. 4, Fig. 5, Fig. 7, Steel Backing Plate 3 of the present utility model is an irregular hexagonal plank frame, adopts steel plate to process.At the middle part of Steel Backing Plate 3, be provided with the two rows taper hole corresponding with the through hole 24 of dovetails 2 31, in the periphery of two row's taper holes 31 according to the distribution between the form structure of each brake lining friction piece 1 and 5 brake lining friction pieces 1, correspondence is provided with 5 for being fixedly connected with the concave station hole 32 of brake lining friction piece 1, and in the periphery in each concave station hole 32, be provided with the pin joint hole 33 corresponding with three pilot holes 14 on each friction piece skeleton 11, the auxiliary hole 34,35,36 that is provided with mounting fixture location use at upper and lower edge and the curved edge of Steel Backing Plate 3.
As shown in Figure 6, Figure 7, rivet 4 of the present utility model, large pad 5, minipad 6, butterfly shell fragment 7 are with cotter pin 8 link that is connected brake lining friction piece 1, and rivet 4 stage casings are thick axle 41, latter end be thin axle 42(as shown in figure 10).Butterfly shell fragment 7 is cone barrel type structure, and its upper end-hole 71 is little, lower end mouth 72 large (as shown in figure 11).The end of each rivet 4 is successively through after the center hole 11 of brake lining friction piece 1, large pad 5, minipad 6, butterfly shell fragment 7, respectively each brake lining friction piece 1 is riveted on each concave station hole 32 of Steel Backing Plate 3, and minipad 6 is placed in the upper end-hole 71 of butterfly shell fragment 7, large pad 5 is placed in the lower end mouth 72 of butterfly shell fragment 7.In one end of interior equal pin joint one cotter pin 8 in each pin joint hole 33 of Steel Backing Plate 3, the other end of cotter pin 8 is suspended in each pilot hole 14 of each friction piece skeleton 11.In the present embodiment, cotter pin 8 is a cylindrical structure, adopts steel plate to roll and forms.
As shown in Fig. 7, Figure 12, flathead rivet 9 end caps of the present utility model are provided with the frustum 91 matching with the taper hole 31 of Steel Backing Plate 3, and its end is radially provided with a shrinkage pool 92.The end of each flathead rivet 9, respectively through the taper hole 31 of Steel Backing Plate 3 and the rear riveted joint of through hole 24 of dovetails 2 correspondences, is fixed on dovetails 2 at the back of Steel Backing Plate 3.
In above-described embodiment, the lower end mouth 72 of butterfly shell fragment 7 and large pad 5 abut on friction piece skeleton 11, large pad 5 internal diameters are set on the thick axle 41 of rivet 4, and the upper end-hole 71 of butterfly shell fragment 7 and minipad 6 abut on Steel Backing Plate 3, and minipad 6 internal diameters are set on the thin axle 42 of rivet 4.
In above-described embodiment, the height of dish-shaped shell fragment 7 is 3mm, and dish-shaped shell fragment 7 adopts Steel Spring Plate to process.Gap between each brake lining friction piece 1 and Steel Backing Plate 3 is that the resiliently deformable by dish-shaped shell fragment 7 regulates, each brake lining friction piece 1 upper surface forms three face structures, the degree of depth of the pilot hole 14 of friction piece skeleton 11 is 5mm, when brake lining friction piece 1 is subject to external force, being suspended in cotter pin 8 in the pilot hole 14 of each friction piece skeleton 11 supports for leg, each cotter pin 8 is simultaneously again expansion pin, make and then strengthened the flatness of brake lining friction piece 1 upper surface, in braking process, make braking force distribution ratio stress equalization, can also effectively prevent the rotation of each brake lining friction piece 1 and become flexible.
When the utility model is installed: as shown in Figure 9
1) in interior one end of selling respectively into a cotter pin 8, each pin joint hole 33 of Steel Backing Plate 3;
2) through hole of dovetails 2 24 is alignd with the taper hole 31 of Steel Backing Plate 3, in each hole of alignment, penetrate respectively a flathead rivet 9, the shrinkage pool 92 that knocks respectively each flathead rivet 9 by special tool makes its distortion riveted joint;
3) rivet 4 ends are penetrated after the center hole 16 of brake lining friction piece 1, again by the anti-protruding column that is arranged on riveting machine platform frock of the center hole of brake lining friction piece 1 16, make cylinder withstand the upper cap of rivet 4, again rivet 4 ends are inserted in successively to a large pad 5, a minipad 6 and a butterfly shell fragment 7, and butterfly shell fragment 7 large ports 71 and the large corresponding socket of pad 5, the socket corresponding to minipad 6 of the portlet 72 of butterfly shell fragment 7;
4) riveted joint is integrated to Steel Backing Plate 3 and dovetails 2 and is positioned over rivet 4 tops of putting on, and each concave station hole 32 correspondence of Steel Backing Plate 3 are inserted in to the end at each rivet 4, start riveting machine each brake lining friction piece 1 is completed to riveted joint one by one;
5) the utility model of having riveted is taken off, then the attachment hole of Steel Backing Plate 3 34,35,36 correspondences are connected on the brake calipers of car body.
The various embodiments described above are only for illustrating the utility model; wherein the structure of each parts, Placement etc. all can change to some extent; every equivalents of carrying out on the basis of technical solutions of the utility model and improvement, all should not get rid of outside protection domain of the present utility model.

Claims (9)

1. the powder metallurgy brake pad that CRH5 EMUs are used, is characterized in that: it comprises 5 brake lining friction pieces, a dovetails, a Steel Backing Plate, 5 rivets, 5 large pads, 5 minipads, 5 butterfly shell fragments, 15 cotter pins and 6 flathead rivets;
5 described brake lining friction pieces are fastenedly connected the front portion at described Steel Backing Plate, described in each, brake lining friction piece comprises that one has the equilateral triangle friction piece skeleton of three arc anglings, and one is arranged on described friction piece skeleton upper surface and the friction piece identical with described friction piece frame configuration; The center of described friction piece skeleton is provided with a step hole, on three arc anglings of described friction piece skeleton, be provided with a pilot hole, described friction piece skeleton wherein described in one the bilateral symmetry of pilot hole and described step hole line be provided with a pair of recessed material grasping hole; The step hole of the center hole of described friction piece and described friction piece skeleton connects; Described dovetails is fastenedly connected the back at described Steel Backing Plate, described dovetails is the long slab structure that sectional shape is W type, described dovetails middle part is a trapezoid boss, bilateral symmetry is a trapezoidal groove, described in each, on low groove, be interval with three through holes, described in each, the outer wing limit of groove is all spaced apart is provided with two gap;
Described Steel Backing Plate is an irregular hexagonal plank frame, and the middle part correspondence of described Steel Backing Plate is provided with the two rows taper hole corresponding with the through hole of described dovetails; Periphery at the described taper hole of two rows is provided with 5 for being fixedly connected with the concave station hole of described brake lining friction piece according to the distribution correspondence between the form structure of brake lining friction piece described in each and 5 described brake lining friction pieces, and the periphery in concave station hole is provided with the pin joint hole corresponding with three described pilot holes on friction piece skeleton described in each described in each, the auxiliary hole that is provided with a mounting fixture location use at upper and lower edge and the curved edge of described Steel Backing Plate;
Described rivet, large pad, minipad, butterfly shell fragment are with cotter pin the link that is connected described brake lining friction piece, and the stage casing of described rivet is thick axle, and latter end is thin axle; Described butterfly shell fragment is cone barrel type structure, and its upper end is young, and lower end mouth is large; Described in each, the end of rivet is successively through after the center hole of described brake lining friction piece, large pad, minipad, butterfly shell fragment, respectively brake lining friction piece described in each is riveted on each concave station hole of described Steel Backing Plate, and described minipad is placed in the upper end-hole of described butterfly shell fragment, described large pad is placed in the lower end mouth of described butterfly shell fragment; Described cotter pin is a cylindrical structure, is all connected with one end of cotter pin described in each pin joint hole of described Steel Backing Plate, and the other end of described cotter pin is suspended in each pilot hole of friction piece skeleton described in each;
Described flathead rivet end cap is provided with the frustum coordinating with the taper hole of described Steel Backing Plate, and the end of described flathead rivet is radially provided with a shrinkage pool; Described in each, the end of flathead rivet, respectively through after the taper hole of described Steel Backing Plate and the through hole of described dovetails, is riveted on described Steel Backing Plate back by described dovetails.
2. the powder metallurgy brake pad that CRH5 EMUs as claimed in claim 1 are used, is characterized in that: the material grasping hole of described friction piece skeleton is at least more than two, the employing powder metallurgy integrated die-casting sinter molding of described friction piece.
3. the powder metallurgy brake pad that CRH5 EMUs as claimed in claim 1 are used, is characterized in that: described dovetails adopts steel plate punched once-through.
4. the powder metallurgy brake pad that CRH5 EMUs as claimed in claim 1 are used, is characterized in that: described Steel Backing Plate adopts steel plate to process, and described cotter pin adopts steel plate to roll and forms.
5. the powder metallurgy brake pad that CRH5 EMUs are as claimed in claim 1 or 2 or 3 or 4 used, it is characterized in that: the lower end mouth of described butterfly shell fragment and described large pad abut on described friction piece skeleton, described large pad internal diameter is set on the thick axle of described rivet, the upper end-hole of described butterfly shell fragment and described minipad abut on described Steel Backing Plate, and described minipad internal diameter is set on the thin axle of described rivet.
6. the powder metallurgy brake pad that CRH5 EMUs are as claimed in claim 1 or 2 or 3 or 4 used, is characterized in that: the height of described dish-shaped shell fragment is 3mm, and described dish-shaped shell fragment adopts Steel Spring Plate to process.
7. the powder metallurgy brake pad that CRH5 EMUs are as claimed in claim 1 or 2 or 3 or 4 used, it is characterized in that: the gap described in each between brake lining friction piece and described Steel Backing Plate is that the resiliently deformable by described dish-shaped shell fragment regulates, described in each, brake lining friction piece upper surface forms three face structures, the pilot hole degree of depth of described friction piece skeleton is 5mm, when brake lining friction piece is subject to external force, the cotter pin being suspended in the pilot hole of friction piece skeleton described in each is that leg supports, and described in each, cotter pin is again expansion pin simultaneously.
8. the powder metallurgy brake pad that CRH5 EMUs as claimed in claim 5 are used, it is characterized in that: the gap described in each between brake lining friction piece and described Steel Backing Plate is that the resiliently deformable by described dish-shaped shell fragment regulates, described in each, brake lining friction piece upper surface forms three face structures, the pilot hole degree of depth of described friction piece skeleton is 5mm, when brake lining friction piece is subject to external force, the cotter pin being suspended in the pilot hole of friction piece skeleton described in each is that leg supports, and described in each, cotter pin is again expansion pin simultaneously.
9. the powder metallurgy brake pad that CRH5 EMUs as claimed in claim 6 are used, it is characterized in that: the gap described in each between brake lining friction piece and described Steel Backing Plate is that the resiliently deformable by described dish-shaped shell fragment regulates, described in each, brake lining friction piece upper surface forms three face structures, the pilot hole degree of depth of described friction piece skeleton is 5mm, when brake lining friction piece is subject to external force, the cotter pin being suspended in the pilot hole of friction piece skeleton described in each is that leg supports, and described in each, cotter pin is expansion pin simultaneously.
CN201320613312.0U 2013-09-30 2013-09-30 Powder metallurgy brake pad for CRH5 multiple unit trains Withdrawn - After Issue CN203548663U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201320613312.0U CN203548663U (en) 2013-09-30 2013-09-30 Powder metallurgy brake pad for CRH5 multiple unit trains

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Application Number Priority Date Filing Date Title
CN201320613312.0U CN203548663U (en) 2013-09-30 2013-09-30 Powder metallurgy brake pad for CRH5 multiple unit trains

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103470665A (en) * 2013-09-30 2013-12-25 北京浦然轨道交通科技有限公司 Powder metallurgy brake lining for CRH5 (China railway high-speed) motor train unit
CN104455103A (en) * 2014-12-10 2015-03-25 贵州新安航空机械有限责任公司 Brake pad

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103470665A (en) * 2013-09-30 2013-12-25 北京浦然轨道交通科技有限公司 Powder metallurgy brake lining for CRH5 (China railway high-speed) motor train unit
CN103470665B (en) * 2013-09-30 2016-02-24 北京浦然轨道交通科技有限公司 A kind of powder metallurgy brake pad of CRH5 EMUs
CN104455103A (en) * 2014-12-10 2015-03-25 贵州新安航空机械有限责任公司 Brake pad

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Granted publication date: 20140416

Effective date of abandoning: 20160224