CN109322949A - A kind of dovetail steel back integral type standard EMU powder metallurgy brake pad - Google Patents
A kind of dovetail steel back integral type standard EMU powder metallurgy brake pad Download PDFInfo
- Publication number
- CN109322949A CN109322949A CN201811178671.1A CN201811178671A CN109322949A CN 109322949 A CN109322949 A CN 109322949A CN 201811178671 A CN201811178671 A CN 201811178671A CN 109322949 A CN109322949 A CN 109322949A
- Authority
- CN
- China
- Prior art keywords
- steel back
- brake lining
- friction block
- dovetail
- dovetail steel
- Prior art date
- 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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- 241000357293 Leptobrama muelleri Species 0.000 title claims abstract description 71
- 238000004663 powder metallurgy Methods 0.000 title claims abstract description 16
- 230000001788 irregular Effects 0.000 claims description 4
- 238000003754 machining Methods 0.000 claims description 3
- 239000002184 metal Substances 0.000 claims description 3
- 239000000428 dust Substances 0.000 abstract description 10
- 238000005457 optimization Methods 0.000 abstract description 4
- 238000000034 method Methods 0.000 description 9
- 238000010586 diagram Methods 0.000 description 6
- 238000009826 distribution Methods 0.000 description 5
- 238000005299 abrasion Methods 0.000 description 3
- 230000002159 abnormal effect Effects 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 102000010970 Connexin Human genes 0.000 description 1
- 108050001175 Connexin Proteins 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000000747 cardiac effect Effects 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000007667 floating Methods 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000009987 spinning Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
-
- 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
-
- 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
- F16D65/02—Braking members; Mounting thereof
- F16D65/04—Bands, shoes or pads; Pivots or supporting members therefor
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Braking Arrangements (AREA)
Abstract
The invention discloses a kind of dovetail steel back integral type standard EMU powder metallurgy brake pads, including dovetail steel back, multiple brake lining friction blocks, multiple brake lining disk springs and multiple butterfly circlips；Each brake lining friction block is center convex surface hexagonal with the positive hexagonal structure with fillet surface, and center is equipped with a locking pin, and locking pin length is greater than the sum of disk spring and the thickness of dove-tail form steel back, and exceeds on part and be additionally provided with an annular groove；Dovetail steel back is equipped with multiple positioning socket bore, brake lining friction block is straggly to be distributed in dovetail steel back, the locking pin of each brake lining friction block passes through disk spring and protrudes into dovetail steel back to be positioned in socket bore accordingly, and the locking pin and butterfly circlip for being provided with annular groove cooperate clamping.By optimization dovetail steel back and friction block mounting structure and position, brake lining eccentric wear can be effectively avoided, makes the smooth discharge of abrasive dust, solves the phenomenon that friction block falls side.
Description
Technical field
The present invention relates to a kind of train braking technology more particularly to a kind of dovetail steel back integral type standard EMU powder
Metallurgical brake lining.
Background technique
Currently, high-speed train braking mainly relies on the phase mutual friction of brake pad and brake disc to realize, with column
The continuous improvement of vehicle speed, brake load is also increasing, and the requirement to brake pad is also higher and higher.However, existing brake lining
For standard EMU, the phenomenon that abnormal wear often occur, be mainly shown as: brake lining eccentric wear is serious, friction block falls side phenomenon
Friction block is unreasonable that abrasive dust is caused can not arranged for prominent, brake lining layout, occurs sticking to the pan phenomenon.Therefore, brake lining abnormal wear is solved
The phenomenon that, it is necessary to optimized to the brake lining that uses of brake disc pairing.
Summary of the invention
The object of the present invention is to provide a kind of dovetail steel back integral type standard EMU powder metallurgy brake pads.
The purpose of the present invention is what is be achieved through the following technical solutions:
Dovetail steel back integral type standard EMU powder metallurgy brake pad of the invention, including dovetail steel back, multiple brake linings
Friction block, multiple brake lining disk springs and multiple butterfly circlips；
Each brake lining friction block is center convex surface hexagonal with the positive hexagonal structure with fillet surface, and center is equipped with a locking
Pin, locking pin length are greater than the sum of disk spring and the thickness of dove-tail form steel back, and exceed on part and be additionally provided with an annular groove；
The dovetail steel back is equipped with multiple positioning socket bore, and brake lining friction block is straggly to be distributed in the dovetail steel back, often
The disk spring that the locking pin of one brake lining friction block passes through is protruded into the dovetail steel back and is positioned in socket bore accordingly, is provided with
The locking pin and butterfly circlip of annular groove cooperate clamping.
As seen from the above technical solution provided by the invention, dovetail steel back integral type mark provided in an embodiment of the present invention
Quasi- EMU powder metallurgy brake pad, uniform heat distribution when work, even wearing can effectively adjust brake lining deformation, reduce system
Efficient cause overcome deformation and caused by loss, and have the characteristics that convenient disassembly when replacement, and brake lining friction bulk strength is high, energy
Effectively inhibit to wear chip off-falling phenomenon in use.The present invention passes through optimization dovetail steel back and friction block mounting structure and position, energy
It is enough effectively to avoid brake lining eccentric wear, make the smooth discharge of abrasive dust, solves the phenomenon that friction block falls side.
Detailed description of the invention
Fig. 1 a, Fig. 1 b are respectively dovetail steel back integral type standard EMU powder metallurgy lock provided in an embodiment of the present invention
The front and back structural schematic diagram of piece；
Fig. 2 a, Fig. 2 b are respectively the front and back structural schematic diagram of the dovetail steel back in the embodiment of the present invention；
Fig. 3 is the structural schematic diagram of the disk spring in the embodiment of the present invention；
Fig. 4 a, Fig. 4 b are respectively the structural schematic diagram of the friction block and its locking pin in the embodiment of the present invention；
Fig. 5 is the structural schematic diagram of the backboard in the embodiment of the present invention；
Fig. 6 is the structural schematic diagram of the butterfly circlip in the embodiment of the present invention.
Appended drawing reference indicates in figure are as follows:
1, dovetail steel back；11, disk spring slot；12, socket bore is positioned；13, anti-rotation boss structure；14, inverted trapezoidal dovetail
Irregular pentagon plank frame；15, butterfly circlip card slot；2, friction block；21, locking pin；22, annular groove；23, middle cardiac prominence
Face；24, fillet surface；25, regular hexagon backboard；26, regular hexagon friction piece；27, through-hole；28, boss；3, disk spring；4,
Butterfly circlip；41, open end；42, round clasp；43, circlip exit passageway.
Specific embodiment
The embodiment of the present invention will be described in further detail below.What is be not described in detail in the embodiment of the present invention is interior
Appearance belongs to the prior art well known to professional and technical personnel in the field.
Dovetail steel back integral type standard EMU powder metallurgy brake pad of the invention, preferable specific embodiment
It is:
Including dovetail steel back, multiple brake lining friction blocks, multiple brake lining disk springs and multiple butterfly circlips.
Each brake lining friction block is center convex surface hexagonal with the positive hexagonal structure with fillet surface, and center is equipped with a locking
Pin, locking pin length are greater than the sum of disk spring and the thickness of dove-tail form steel back, and exceed on part and be additionally provided with an annular groove；
The dovetail steel back is equipped with multiple positioning socket bore, and brake lining friction block is straggly to be distributed in the dovetail steel back, often
The disk spring that the locking pin of one brake lining friction block passes through is protruded into the dovetail steel back and is positioned in socket bore accordingly, is provided with
The locking pin and butterfly circlip of annular groove cooperate clamping.
The dovetail steel back is the irregular pentagon plank frame that back connects an inverted trapezoidal dovetail, is dovetail and steel back one
Body formula metal machining part；
It is hollowed out in the middle part of dovetail steel back, and is equipped with multiple butterfly circlip card slots, in the plate surface of the dovetail steel back
On be provided with multiple disk spring slots, center is provided with positioning socket bore, and multiple dimple holes therein are located in butterfly circlip card slot
Heart position.
Anti- rotation boss structure, anti-rotation boss structure and friction block gap constraint are had on the plate surface of the dovetail steel back
Cooperation.
The brake lining friction block includes the consistent regular hexagon backboard of shape and regular hexagon friction piece；
The regular hexagon backboard includes positioning pin and connection backboard；
Several through-holes are additionally provided on the backboard, the corresponding position of friction piece is equipped with boss, is engaged by boss with through-hole
It connect backboard closely with friction piece.
Gap is all had between the brake lining friction block being arranged in dovetail steel back.
The butterfly circlip is rounded butterfly-like, and side is open end；
The inside of the butterfly circlip is equipped with a round clasp matched with the groove of locking pin, and round clasp outlet is logical
Road connects the open end.
Inner edge brake lining friction block distributed quantity is more than outer rim brake lining friction block distributed quantity, and inner edge brake lining friction block always rubs
Area and friction radius square product be greater than the total friction area of outer rim brake lining friction block and friction radius square product.
9 brake lining friction blocks are distributed in each brake pad, and four column are lined up from brake lining inner edge to outer rim, and the brake lining of each column rubs
Cleaning block distributed quantity is followed successively by 3,3,2,1.
Dovetail steel back integral type standard EMU powder metallurgy brake pad of the invention, according to brake lining eccentric wear is serious and lock
Chip layout friction block is unreasonable to cause abrasive dust can not arranged the phenomenon that sticking to the pan, and is laid out the distribution of friction block again, extends each
Gap between friction block, and keep Connexin smooth, dead angle is avoided the occurrence of, the smooth discharge of abrasive dust is made.Fall side according to friction block
Phenomenon distinct issues improve the floating connection mode of steel back and friction block, reduce the angle of friction block spinning, increase friction
Gap between block and friction block increases effective friction area between friction block and brake disc, reduces the intensity of impact.Energy
It is enough effectively to avoid brake lining eccentric wear, make the smooth discharge of abrasive dust, convenient disassembly when solving the phenomenon that friction block falls side, and there is replacement
The characteristics of.
The distribution straggly in the dovetail steel back of heretofore described brake lining friction block, brake lining friction is block-shaped to be arranged in block
It is equipped with certain gap between block, convenient for heat dissipation, reduces brake lining entirety in braking process because of the deflection of expanded by heating, also just
The abrasive dust of brake lining friction block is discharged in time when braking；Gap is smaller between brake lining friction block block and block, guarantees that friction block makes
With having self-locking function in the process, rotation is prevented.There is a certain amount of raised block above steel back, it is smaller with friction block gap,
Have the function of preventing friction block rotation.
The brake lining friction block in the dovetail steel back unit radius friction area and friction radius it is square directly proportional
Relationship, the braking energy that the brake lining friction block on guarantor unit's area is born is identical, ensure that the brake lining friction on unit area
The abrasion of block are identical, can effectively improve brake lining service life.
The brake lining friction block is equipped with smooth fillet, ensure that brake lining friction block in the edge of the friction block
The block edge that rubs will not fall off in high-speed friction braking process because edge effect is broken.
The brake lining friction block positioning and locking pin passes through the slot internal diameter of the disk spring, the positioning socket bore of steel back
Cooperate clamping with butterfly circlip.Automatic fine tuning may be implemented by disk spring and control dynamic plane, be flat and fit with brake disc, into
Row friction catch.
The uniform heat distribution when brake lining works, even wearing can effectively adjust brake lining deformation, reduce brake force because overcoming
Deformation and caused by lose, and have the characteristics that convenient disassembly when replacement, and brake lining friction bulk strength is high, can effectively inhibit to make
With middle abrasion chip off-falling phenomenon.The present invention can be avoided effectively by optimization dovetail steel back and friction block mounting structure and position
Brake lining eccentric wear makes the smooth discharge of abrasive dust, solves the phenomenon that friction block falls side.
Specific embodiment:
As shown in Figure 1 a, 1 b, dovetail steel back 1, brake lining friction block 2, disk spring 3 and butterfly circlip are specifically included that
4。
Wherein Fig. 1 a is front elevation, and Fig. 1 b is back view.In the present embodiment, the dovetail steel back 1 be back connect one fall ladder
The irregular pentagon plank frame 14 of shape dovetail is dovetail and steel back integral type slab metal machining part；Dovetail steel back 1
Middle part hollow out, and be equipped with N number of butterfly circlip card slot 15, dovetail side is there are two gap；
As shown in Fig. 2 a, Fig. 2 b, it is provided with N number of disk spring slot 11 on the plate surface of the dovetail steel back, and
Its center opens up positioning socket bore 12, and N number of positioning socket bore 12 therein is located at 4 card slot center of butterfly circlip.The dovetail steel
1 is carried on the back, anti-rotation boss structure 13 is had on plate surface, cooperates with 2 gap constraint of friction block, control friction block 2 can only be limited to
It is rotated in low-angle.
It will be understood by those skilled in the art that for the ease of indicating to which N is set as 9 in structure as shown in Figs. 1-2, but
Actually the specific value of N can determine according to demand.
As shown in figure 3, each brake lining disk spring 4 is disc structure, spherical surface is engaged with friction block upward.
As shown in Fig. 4 a, Fig. 4 b, each brake lining friction block 2 is 23 hexagonal of center convex surface with positive six with fillet surface 24
Square structure, center are equipped with a locking pin 21, and length is greater than the sum of disk spring 3 and the thickness of dovetail steel back 1, and beyond on part
It is additionally provided with an annular groove 22, center convex surface 23 and the disk spring 3 of friction block are engaged.
Brake lining friction block 2 is straggly to be distributed in the dove-tail form steel back 1, with reduce brake lining it is whole in braking process because by
The deflection of thermal expansion；The disk spring 3 that the locking pin 21 of each brake lining friction block both passes through protrudes into corresponding in the dovetail steel back 1
Positioning socket bore 12 in, clamping is cooperated by the annular groove 22 of locking pin 21 and butterfly circlip 4.
The brake lining friction block in the non-dove-tail form steel back plane unit radius friction area and friction radius it is flat
Side is proportional, and the braking energy that the brake lining friction block on guarantor unit's area is born is identical, ensure that on unit area
The abrasion of braking brake pad are identical, can effectively improve brake lining service life.
In the present embodiment, be mainly used to fix equipped with the locking pin 21 of annular groove 22 in brake lining friction block 2, with prevent from
It falls off in dovetail steel back 1, it also allows brake lining friction block 2 can pass through dish using 21 position of locking pin as rotation center
Shape spring 3 carries out small rotation above the dovetail steel back 1, and the position of the locking pin 21 can guarantee in braking process,
The torque relative to rotation center that unit area friction generates is cancelled out each other with the torque relative to disc centres.
In addition friction block 2 can pass through the elastic telescopic of disk spring 3 and butterfly circlip 4 under the pressure in train braking in brake lining,
So that it reaches being bonded for maximum area with brake disc.
As shown in Fig. 4 a, Fig. 4 b, the brake lining friction block 2 includes: the consistent regular hexagon backboard 25 of shape and positive six side
Shape friction piece 26；
As shown in figure 5, the regular hexagon backboard 25 includes positioning pin and connection backboard；If being additionally provided on the backboard 25
The corresponding position of dry through-hole 27, friction piece is equipped with boss 28, and being engaged by boss 28 with through-hole 27 makes backboard 25 and friction piece 26
Close connection；It ensure that the backboard 25 of the braking brake pad will not fall off in high-speed friction braking process with friction piece 26.
In the present embodiment, certain interval is all had between the brake lining friction block 2 that is arranged in dovetail steel back 1, reduces brake lining
Entirety is because of the deflection of expanded by heating in braking process, and the abrasive dust of brake lining friction block is discharged in time when being more convenient for braking.
As shown in fig. 6, the butterfly circlip 4 is rounded butterfly-like, side is open end 41；The inside of the butterfly circlip
The round clasp 42 matched equipped with one with the groove 22 of locking pin 21,42 exit passageway 43 of round clasp connect the open end
41。
In braking process, automatic adjustment brake lining may be implemented by disk spring 3 and butterfly circlip 4 and brake plane, with
Brake disc realizes being flat and fit for maximum area, carries out friction catch.
Uniform heat distribution when above-mentioned powder metallurgy brake pad provided in this embodiment has work, even wearing can be effective
Brake lining deformation is adjusted, loss caused by reducing brake force due to overcoming deformation, and have the characteristics that convenient disassembly when replacement, and should
Brake lining friction bulk strength is high, can effectively inhibit to wear chip off-falling phenomenon in use.The present invention passes through optimization dovetail steel back and friction
Block mounting structure and position can effectively avoid brake lining eccentric wear, make the smooth discharge of abrasive dust, solve the phenomenon that friction block falls side.
The foregoing is only a preferred embodiment of the present invention, but scope of protection of the present invention is not limited thereto,
Within the technical scope of the present disclosure, any changes or substitutions that can be easily thought of by anyone skilled in the art,
It should be covered by the protection scope of the present invention.Therefore, protection scope of the present invention should be with the protection model of claims
Subject to enclosing.
Claims (8)
1. a kind of dovetail steel back integral type standard EMU powder metallurgy brake pad, which is characterized in that including dovetail steel back (1),
Multiple brake lining friction blocks (2), multiple brake lining disk springs (3) and multiple butterfly circlips (4).
Each brake lining friction block (2) has the positive hexagonal structure with fillet surface (24) for center convex surface (23) hexagonal, and center is set
Have a locking pin (21), locking pin (21) length is greater than the sum of the thickness of disk spring (3) and dove-tail form steel back (1), and exceeds
An annular groove (22) are additionally provided on part；
The dovetail steel back (1) is equipped with multiple positioning socket bore (12), and brake lining friction block (2) is straggly to be distributed in the dovetail steel back
(1) on, the locking pin (21) of each brake lining friction block is protruded by disk spring (3) corresponding in the dovetail steel back (1)
It positions in socket bore (12), the locking pin (21) and butterfly circlip (4) for being provided with annular groove (22) cooperate clamping.
2. dovetail steel back integral type standard EMU powder metallurgy brake pad according to claim 1, which is characterized in that institute
Stating dovetail steel back (1) is the irregular pentagon plank frame (14) that back connects an inverted trapezoidal dovetail, is dovetail and steel back one
Formula metal machining part；
It is hollowed out in the middle part of dovetail steel back, and is equipped with multiple butterfly circlip card slots (15), in the plate-type flat of the dovetail steel back (1)
Multiple disk spring slots (11) are provided on face, center is provided with positioning socket bore (12), and multiple positioning socket bore (12) therein are located at
Butterfly circlip card slot center.
3. dovetail steel back integral type standard EMU powder metallurgy brake pad according to claim 1, which is characterized in that institute
It states on the plate surface of dovetail steel back (1) with anti-rotation boss structure (13), anti-rotation boss structure (13) and friction block (2) gap
Constraint cooperation.
4. a kind of dovetail steel back integral type standard EMU powder metallurgy brake pad according to claim 1, feature exist
In the brake lining friction block (2) includes the consistent regular hexagon backboard (25) of shape and regular hexagon friction piece (26)；
The regular hexagon backboard (25) includes positioning pin and connection backboard；
Be additionally provided on the backboard several through-holes (27), the corresponding position of friction piece is equipped with boss (28), by boss (28) with
Through-hole (27) engagement connect backboard (25) closely with friction piece (26).
5. dovetail steel back integral type standard EMU powder metallurgy brake pad according to claim 1, which is characterized in that set
It sets and all has gap between the brake lining friction block (2) on dovetail steel back (1).
6. a kind of dovetail steel back integral type standard EMU powder metallurgy brake pad according to claim 1, feature exist
In the butterfly circlip (4) is rounded butterfly-like, and side is open end (41)；
The inside of the butterfly circlip is equipped with a round clasp (42) matched with the groove (22) of locking pin (21), circular card
Ring (42) exit passageway (43) connects the open end (41).
7. train brake pad according to any one of claims 1 to 6, which is characterized in that inner edge brake lining friction block (2)
Distributed quantity is more than outer rim brake lining friction block (2) distributed quantity, the total friction area of inner edge brake lining friction block (2) and friction radius
Square product be greater than the total friction area of outer rim brake lining friction block (2) and friction radius square product.
8. train brake pad according to claim 7, which is characterized in that 9 brake linings are distributed in each brake pad
Friction block (2), four column are lined up from brake lining inner edge to outer rim, and brake lining friction block (2) distributed quantity of each column is followed successively by 3,3,2
It is a, 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811178671.1A CN109322949A (en) | 2018-10-10 | 2018-10-10 | A kind of dovetail steel back integral type standard EMU powder metallurgy brake pad |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811178671.1A CN109322949A (en) | 2018-10-10 | 2018-10-10 | A kind of dovetail steel back integral type standard EMU powder metallurgy brake pad |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109322949A true CN109322949A (en) | 2019-02-12 |
Family
ID=65261920
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811178671.1A Pending CN109322949A (en) | 2018-10-10 | 2018-10-10 | A kind of dovetail steel back integral type standard EMU powder metallurgy brake pad |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109322949A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110296167A (en) * | 2019-07-17 | 2019-10-01 | 中铁隆昌铁路器材有限公司 | A kind of high-speed EMUs powder metallurgy brake pad of spherical triangle shape |
| CN111677790A (en) * | 2020-06-18 | 2020-09-18 | 沈阳远程摩擦密封材料有限公司 | Power-concentrated motor car combined brake pad for 160KMh |
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| CN207935332U (en) * | 2017-12-18 | 2018-10-02 | 中车戚墅堰机车车辆工艺研究所有限公司 | A kind of elastic floating brake lining |
| CN209524020U (en) * | 2018-10-10 | 2019-10-22 | 北京瑞斯福高新科技股份有限公司 | A kind of dovetail steel back integral type standard EMU powder metallurgy brake pad |
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| CN205025982U (en) * | 2015-08-27 | 2016-02-10 | 北京浦然轨道交通科技有限公司 | Floating whole brake pad |
| US20180266508A1 (en) * | 2016-06-30 | 2018-09-20 | Beijing Bei Mo Gao Ke Friction Material Co. Ltd | Elastic adjustable brake pad for use in train |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110296167A (en) * | 2019-07-17 | 2019-10-01 | 中铁隆昌铁路器材有限公司 | A kind of high-speed EMUs powder metallurgy brake pad of spherical triangle shape |
| CN111677790A (en) * | 2020-06-18 | 2020-09-18 | 沈阳远程摩擦密封材料有限公司 | Power-concentrated motor car combined brake pad for 160KMh |
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