JPH07280010A - Friction body of brake device and manufacture thereof - Google Patents
Friction body of brake device and manufacture thereofInfo
- Publication number
- JPH07280010A JPH07280010A JP3233895A JP23389591A JPH07280010A JP H07280010 A JPH07280010 A JP H07280010A JP 3233895 A JP3233895 A JP 3233895A JP 23389591 A JP23389591 A JP 23389591A JP H07280010 A JPH07280010 A JP H07280010A
- Authority
- JP
- Japan
- Prior art keywords
- metal
- friction material
- brake
- friction
- alloy
- 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
Links
- 238000004519 manufacturing process Methods 0.000 title claims description 5
- 239000002783 friction material Substances 0.000 claims abstract description 34
- 229910052751 metal Inorganic materials 0.000 claims abstract description 31
- 239000002184 metal Substances 0.000 claims abstract description 31
- 239000000853 adhesive Substances 0.000 claims description 16
- 230000001070 adhesive effect Effects 0.000 claims description 16
- 229910045601 alloy Inorganic materials 0.000 claims description 12
- 239000000956 alloy Substances 0.000 claims description 12
- 238000005507 spraying Methods 0.000 claims description 8
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 6
- 238000000034 method Methods 0.000 claims description 5
- 229910018138 Al-Y Inorganic materials 0.000 claims description 4
- 239000011247 coating layer Substances 0.000 claims description 4
- 239000000463 material Substances 0.000 claims description 4
- 238000004140 cleaning Methods 0.000 claims description 3
- 229910052742 iron Inorganic materials 0.000 claims description 3
- 229910002061 Ni-Cr-Al alloy Inorganic materials 0.000 claims description 2
- 239000010410 layer Substances 0.000 claims 3
- 229910000838 Al alloy Inorganic materials 0.000 claims 1
- 229910018487 Ni—Cr Inorganic materials 0.000 claims 1
- 239000011248 coating agent Substances 0.000 abstract description 9
- 238000000576 coating method Methods 0.000 abstract description 9
- 230000006866 deterioration Effects 0.000 abstract 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 5
- 239000000843 powder Substances 0.000 description 5
- 239000005011 phenolic resin Substances 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- UOCLXMDMGBRAIB-UHFFFAOYSA-N 1,1,1-trichloroethane Chemical compound CC(Cl)(Cl)Cl UOCLXMDMGBRAIB-UHFFFAOYSA-N 0.000 description 2
- 229910003310 Ni-Al Inorganic materials 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 238000005422 blasting Methods 0.000 description 2
- 238000007796 conventional method Methods 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- 235000014593 oils and fats Nutrition 0.000 description 2
- 239000003960 organic solvent Substances 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 238000005498 polishing Methods 0.000 description 2
- 239000011148 porous material Substances 0.000 description 2
- 239000011347 resin Substances 0.000 description 2
- 229920005989 resin Polymers 0.000 description 2
- 238000005406 washing Methods 0.000 description 2
- 241000357293 Leptobrama muelleri Species 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 1
- 229910007570 Zn-Al Inorganic materials 0.000 description 1
- 238000010306 acid treatment Methods 0.000 description 1
- 239000012790 adhesive layer Substances 0.000 description 1
- HSFWRNGVRCDJHI-UHFFFAOYSA-N alpha-acetylene Natural products C#C HSFWRNGVRCDJHI-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 238000004873 anchoring Methods 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000000567 combustion gas Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 125000002534 ethynyl group Chemical group [H]C#C* 0.000 description 1
- 239000002657 fibrous material Substances 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 239000003365 glass fiber Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 239000011490 mineral wool Substances 0.000 description 1
- 239000011236 particulate material Substances 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 238000007788 roughening Methods 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 229920001187 thermosetting polymer Polymers 0.000 description 1
- 239000003981 vehicle Substances 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
- 239000011701 zinc Substances 0.000 description 1
Landscapes
- Braking Arrangements (AREA)
- Coating By Spraying Or Casting (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、ディスクブレーキやド
ラムブレーキの摩擦体に関するものであり、特に、摩擦
体を構成する摩擦材とそれを保持する保持板との接着性
の改善に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a friction body of a disc brake or a drum brake, and more particularly to improvement of adhesion between a friction material forming the friction body and a holding plate holding the friction material. .
【０００２】[0002]
【従来技術】例えば、ディスクブレーキの摩擦パッドＭ
は、図２に示すように摩擦材を保持すべき保持板として
の鋼製の裏板１０の、一方の面１２を、先ず、有機溶剤
によって油脂類等の汚れを除去し、更に、ショットブラ
ストによる研磨によって、清浄化と表面を粗くして接着
面を裏板の面１２と直角方向に拡大してから、金属粉、
セラミック粉、ガラス繊維、ロックウールなどの素材
を、耐熱性の高い樹脂、例えば、フェノール樹脂で、結
合して板状に成形して成る摩擦材１３を、裏板１０に接
着剤によって接着することにより、製造される。2. Description of the Related Art For example, a friction pad M for a disc brake.
As shown in FIG. 2, first, one surface 12 of a steel back plate 10 as a holding plate for holding a friction material is first cleaned of stains such as oils and fats by an organic solvent, and further shot blasted. After polishing and roughening the surface and expanding the adhesive surface in a direction perpendicular to the surface 12 of the back plate, the metal powder,
A friction material 13 formed by bonding materials such as ceramic powder, glass fiber, rock wool, etc., with a resin having high heat resistance, for example, phenol resin, and forming into a plate shape is adhered to the back plate 10 with an adhesive. Is manufactured by.
【０００３】裏板１０に摩擦材を一体的に形成する方法
としては、上述のように、先ず板状の摩擦材１３を成形
して、これを、裏板面に接着する方法と、粉体状の素材
を、成形型と裏板との間で、加圧及び加熱して、摩擦材
１３の成形と成形物の裏板への接着とを１工程で行う方
法も行なわれる。As a method for integrally forming the friction material on the back plate 10, as described above, first, the plate-shaped friction material 13 is formed and then adhered to the back plate surface, and the powder is used. There is also performed a method in which a material having a shape of a ring is pressed and heated between the molding die and the back plate to form the friction material 13 and adhere the molded product to the back plate in one step.
【０００４】[0004]
【問題点】一般に、摩擦材は、多種類の粒子状素材や繊
維状素材が、フェノール樹脂等によって接着結合された
ものから成るので、微細な孔隙を有しており、摩擦材と
裏板との接着面には、この孔隙を通して湿分や水分が到
達してしまい、それによって、裏板に錆が発生して摩擦
材と裏板との接着強度が損なわれる原因となっている。[Problem] Generally, since the friction material is composed of various kinds of particulate materials and fibrous materials that are adhesively bonded by a phenol resin or the like, it has fine pores, and the friction material and the back plate are Moisture and moisture reach the adhesive surface of the back plate through the pores, which causes rust on the back plate and reduces the adhesive strength between the friction material and the back plate.
【０００５】ブレーキ部品の欠陥は、車両の安全性、ひ
いては、人命に直接関わってくるので、ブレーキ部品の
接着強度には、かなりの安全率を見込まなければならな
いが、従来の摩擦体は、苛酷な使用条件下において、錆
が進行すると最悪の場合は、裏板から摩擦材が剥離して
しまうおそれもあった。このことは、ディスクブレーキ
だけでなく、ドラムブレーキにおいて、摩擦材の保持板
としてのブレーキシューと、摩擦材としてのブレーキラ
イニングとの間の接着についても全く同様の関係にあ
る。Since the defects of the brake parts are directly related to the safety of the vehicle and, in turn, the human life, a considerable safety factor must be taken into consideration in the adhesive strength of the brake parts, but the conventional friction body is harsh. If the rust progresses under various usage conditions, in the worst case, the friction material may peel off from the back plate. This applies not only to the disc brake but also to the drum brake, and the bond between the brake shoe as the holding plate of the friction material and the brake lining as the friction material has the same relationship.
【０００６】[0006]
【発明の構成】本発明は、このような、従来のブレーキ
装置の摩擦体の欠点を解消することを目的とするもので
あって、その要旨は、ブレーキディスク或はブレーキド
ラムに圧接して制動を行う摩擦材と、該摩擦材を一側の
面に一体的に保持する保持板とから成るブレーキ装置の
摩擦体において、前記摩擦材が、前記保持板の一側の面
に一体成形された金属溶射被膜上に接着されて一体的に
保持されていることを特徴とするブレーキ装置の摩擦体
と、摩擦材を保持すべき保持板表面を清浄化処理したの
ち、金属溶射処理を行うことにより、該保持板表面に、
金属被膜層を形成し、該金属被膜層上に、摩擦材を、接
着剤によって、保持板と一体的に設けることを特徴とす
るブレーキ装置の摩擦体の製造方法とにある。以下、主
として、ディスクブレーキ用摩擦体であるブレーキパッ
ドについて詳細に説明するが、これは、ドラムブレーキ
用のブレーキシュー(保持板)とブレーキライニング(摩
擦材)の一体化にも適用できるものであって、これらを
排除することを意味するものではない。SUMMARY OF THE INVENTION An object of the present invention is to eliminate such a drawback of the friction body of the conventional brake device, and the gist thereof is to press the brake disk or the brake drum to apply the brake. In a friction body of a brake device comprising a friction material for carrying out the above and a holding plate integrally holding the friction material on one surface, the friction material is integrally formed on one surface of the holding plate. By performing a metal spraying process after cleaning the friction body of the brake device, which is adhered and held integrally on the metal sprayed coating, and the surface of the holding plate that should hold the friction material. , On the surface of the holding plate,
A method of manufacturing a friction body for a brake device, comprising forming a metal coating layer and providing a friction material integrally with the holding plate on the metal coating layer with an adhesive. Hereinafter, the brake pad, which is a friction body for a disc brake, will be mainly described in detail, but this is also applicable to the integration of the brake shoe (holding plate) for the drum brake and the brake lining (friction material). It does not mean that these are excluded.
【０００７】上記において、裏板表面の清浄化処理とし
ては、トリクロルエタン等の有機溶剤による洗浄、或
は、酸処理による洗浄、又は、これら両者を併用しても
よく、更には、ショットブラスト加工によって、研磨及
び微細な凹凸を形成することも含まれる。特に、ショッ
トブラスト加工によって、粗くされた表面は、接着表面
が拡大すると共に凹部に接着剤がまわり込んで硬化する
ので、アンカー効果(投錨効果)によって、接着強度が増
す。In the above, as the cleaning treatment of the surface of the back plate, washing with an organic solvent such as trichloroethane, washing with an acid treatment, or both of them may be used in combination, and further shot blasting It also includes polishing and forming fine irregularities. In particular, the surface roughened by shot blasting expands the adhesive surface and at the same time the adhesive wraps around the recesses and hardens, so the adhesive strength increases due to the anchor effect (anchoring effect).
【０００８】金属溶射は、常法により、溶射ガンを用い
て、例えば、酸素とアセチレン、或は、酸素とプロバン
ガス等の燃焼ガス中に、粉末状若しくは針金状の被覆用
金属を供給し、溶融した被覆用金属を圧縮空気によって
噴霧状にして、裏板表面に吹き付けることにより行なわ
れる。In the metal spraying, a powder or wire-like coating metal is supplied to a combustion gas such as oxygen and acetylene or oxygen and Provan gas by a conventional method using a spray gun to melt the metal. The coating metal is atomized with compressed air and sprayed onto the surface of the back plate.
【０００９】被覆用金属としては、鉄よりもイオン化傾
向の高い金属であることが望ましくアルミニウム、亜
鉛、或は、これらの金属の合金が望ましい。このような
合金としては、例えば、ＺnーＡl合金、ＮiーＡl合金、
ＮiーＣrーＡl合金、ＮiーＣrーＡlーＹ合金、ＣoーＣr
ーＡl−Ｙ合金などを挙げることができる。被膜と保持
板との密着力は、すくなくとも、７０Ｋｇ／ｃｍ2以上
あることが望ましい。又被膜の厚さは、１０〜１００μ
の範囲で適宜選択される。The coating metal is preferably a metal having a higher ionization tendency than iron, and aluminum, zinc, or an alloy of these metals is desirable. Examples of such alloys include Zn-Al alloys, Ni-Al alloys,
Ni-Cr-Al alloy, Ni-Cr-Al-Y alloy, Co-Cr
-Al-Y alloy etc. can be mentioned. The adhesive force between the coating film and the holding plate is preferably at least 70 kg / cm 2 or more. The thickness of the coating is 10-100μ
Is appropriately selected within the range.
【００１０】このようにして得られる裏板の金属被覆面
に、予め、所定の形状に成型された摩擦材を、接着剤に
よって接着し一体化する。接着剤としては、フェノール
樹脂などのような耐熱性の高い熱硬化性樹脂が使用され
る。裏板と摩擦材との一体化工程は、前述のように、未
硬化の接着剤を含有する粉粒状摩擦素材を加熱型によっ
て裏板に圧接することにより、行うこともできる。A friction material molded in a predetermined shape in advance is bonded to the metal-coated surface of the back plate thus obtained by an adhesive to be integrated. As the adhesive, a thermosetting resin having high heat resistance such as phenol resin is used. The step of integrating the back plate and the friction material can be performed by pressing the powdery friction material containing the uncured adhesive to the back plate with a heating die as described above.
【００１１】[0011]
【効果】本発明に係る製法によって得られる摩擦体は、
金属溶射被膜の存在によって、後記試験例からも明らか
なように、錆の発生しやすい条件において長期にわたっ
て使用しても、摩擦材と保持板との接着強度の低下が殆
どなく、従来の製品に比べて、数倍の耐久性を有してお
り、ブレーキの信頼性を高めるのに効果が大きい。以下
に実施例及び試験例を掲げる。[Effect] The friction body obtained by the manufacturing method according to the present invention is
Due to the presence of the metal spray coating, as is clear from the test examples below, there is almost no decrease in the adhesive strength between the friction material and the holding plate even after long-term use under conditions where rust is likely to occur. Compared to this, it has several times the durability and is highly effective in increasing the reliability of the brake. Examples and test examples are listed below.
【００１２】[0012]
【実施例】鋼板から、プレス成型によって得られた一対
の透孔２を有する摩擦材保持板としての裏板１をトリク
ロルエタンによって洗浄して、油脂類を除去し、更に、
一側の面３に、ショットブラストをかけて、研磨し、微
細な凹凸を表面に形成する。ついで、溶射ガンによって
アセチレンガスと酸素の燃焼ガス中に、ＮiーＡl(９５:
５)パウダーを供給して、裏板の表面３に溶射すること
により、平均の厚さが２０μ前後の溶射被膜４を形成す
る。このようにして得られた金属被膜層が形成された裏
板に、フェノール樹脂系接着剤を塗布し、常法に基づい
て、予め成形しておいた摩擦材５を圧接すると共に加熱
して接着剤を硬化させることにより、ディスクブレーキ
用摩擦体としてのブレーキパッドＰを得る。Example A back plate 1 as a friction material holding plate having a pair of through holes 2 obtained by press molding from a steel plate is washed with trichloroethane to remove oils and fats, and
The surface 3 on one side is shot-blasted and polished to form fine irregularities on the surface. Then, a Ni-Al (95:
5) Powder is supplied and sprayed on the surface 3 of the back plate to form the sprayed coating 4 having an average thickness of about 20 μm. A phenol resin adhesive is applied to the back plate thus obtained on which the metal coating layer is formed, and the friction material 5 formed in advance is pressure-welded and heated to adhere according to a conventional method. By curing the agent, a brake pad P as a friction body for a disc brake is obtained.
【００１３】[0013]
【実験例】上記実施例で得られたブレーキパッドＰと、
上記実施例において金属溶射工程を省き、他は全く同一
の方法で得られたブレーキパッドＭ(図２)を、夫々１０
個づつ準備して、Ｐ群、Ｍ群とし、温度５０℃で、相対
湿度９８％ＲＨの恒温恒湿室中に３昼夜放置し、つい
で、２２０℃に保った高温室に１時間放置してから、取
り出して直ちに室温の水に投入し、２３時間そのまま水
中に浸し、ついで、水中から取り出して１時間室温で放
置する、延べ５日間の過程を１サイクルとして、夫々の
群について、１０サイクルを繰り返した。結果は、Ｍ群
に属するブレーキパッドは、例外なく、２サイクル終了
時において摩擦材１３と裏板１０との接着面に錆を生じ
た。それに対して、Ｐ群は１０サイクル終了時にも錆を
発生しなかった。[Experimental example] The brake pad P obtained in the above-mentioned example,
The brake pads M (FIG. 2) obtained by the same method except that the metal spraying step was omitted in the above-mentioned embodiment were used respectively.
Prepare them one by one, set them as P group, M group, and leave them in a constant temperature and humidity room at a temperature of 50 ° C. and a relative humidity of 98% RH for 3 days and then leave them in a high temperature room maintained at 220 ° C. for 1 hour. Then, immediately take it out and put it in water at room temperature, soak it in water as it is for 23 hours, then take it out from water and let it stand at room temperature for 1 hour. I repeated. As a result, the brake pads belonging to the group M were rusted on the bonding surface between the friction material 13 and the back plate 10 at the end of the two cycles without exception. On the other hand, P group did not generate rust even after 10 cycles.
【００１４】又、１０サイクル終了後におけるブレーキ
パッドを剥離試験に供したが、Ｍ群は、錆がブレーキパ
ッド側に付着して裏金の金属面が露出する状態で剥離し
たが、Ｐ群は裏板側に接着剤層が残存する状態で剥離し
た。Further, the brake pads after 10 cycles were subjected to a peeling test, and the M group peeled in a state where rust adhered to the brake pad side and the metal surface of the back metal was exposed, but the P group did not. It was peeled off with the adhesive layer remaining on the plate side.
【図１】本発明に係るブレーキパッドの一実施例を示す
断面図である。FIG. 1 is a sectional view showing an embodiment of a brake pad according to the present invention.
【図２】従来のブレーキパッドの一例を示す説明図であ
る。FIG. 2 is an explanatory diagram showing an example of a conventional brake pad.
１．１２ 裏板 ２． 透孔 ４． 溶射金属被膜 ５．１３． 摩擦材 1.12. Back plate 2. Through hole 4. Sprayed metal coating 5.13. Friction material
Claims (5)
接して制動を行う摩擦材と、該摩擦材を一側の面に一体
的に保持する保持板とから成るブレーキ装置の摩擦体に
おいて、前記摩擦材が、前記保持板の一側の面に形成さ
れた金属溶射被膜上に接着されて一体的に保持されてい
ることを特徴とするブレーキ装置の摩擦体。1. A friction body of a brake device, comprising a friction material that presses against a brake disc or a brake drum to perform braking, and a holding plate that integrally holds the friction material on one surface thereof. A friction body of a brake device, wherein a material is adhered and held integrally on a metal spray coating formed on one surface of the holding plate.
高い金属元素若しくは、該金属元素を含む合金によって
構成されている請求項１の摩擦材。2. The friction material according to claim 1, wherein the metal spray coating is made of a metal element having a higher ionization tendency than iron or an alloy containing the metal element.
l合金、ＮiーＣr合金、ＮiーＣrーＡl合金、ＮiーＣrー
ＡlーＹ合金又は、ＣoーＣrーＡlーＹ合金で構成されて
いる請求項１の摩擦体。3. The metal spray coating is a Zn--Al alloy, Ni--A
The friction body according to claim 1, which is made of an alloy, a Ni-Cr alloy, a Ni-Cr-Al alloy, a Ni-Cr-Al-Y alloy, or a Co-Cr-Al-Y alloy.
処理したのち、金属溶射処理を行うことにより、該保持
板表面に、金属被膜層を形成し、該金属被膜層上に、摩
擦材を、接着剤によって、保持板と一体的に設けること
を特徴とするブレーキ装置の摩擦体の製造方法。4. A metal plate layer is formed on the surface of the holding plate by cleaning the surface of the holding plate on which the friction material is to be held, and then performing a metal spraying treatment, and a friction layer is formed on the metal film layer. A method for manufacturing a friction body of a brake device, wherein the material is integrally provided with a holding plate by an adhesive.
い金属元素若しくは、該金属元素を含む合金によって構
成されている請求項４の摩擦体の製造方法。5. The method for producing a friction body according to claim 4, wherein the metal coating layer is made of a metal element having a higher ionization tendency than iron or an alloy containing the metal element.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3233895A JPH07280010A (en) | 1991-08-20 | 1991-08-20 | Friction body of brake device and manufacture thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3233895A JPH07280010A (en) | 1991-08-20 | 1991-08-20 | Friction body of brake device and manufacture thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH07280010A true JPH07280010A (en) | 1995-10-27 |
Family
ID=16962255
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3233895A Pending JPH07280010A (en) | 1991-08-20 | 1991-08-20 | Friction body of brake device and manufacture thereof |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH07280010A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008002653A (en) * | 2006-06-26 | 2008-01-10 | Akebono Brake Ind Co Ltd | Method for manufacturing friction member |
| KR100911576B1 (en) * | 2008-05-08 | 2009-08-10 | 현대자동차주식회사 | Vehicle brake drum and method of manufacturing the same |
-
1991
- 1991-08-20 JP JP3233895A patent/JPH07280010A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008002653A (en) * | 2006-06-26 | 2008-01-10 | Akebono Brake Ind Co Ltd | Method for manufacturing friction member |
| KR100911576B1 (en) * | 2008-05-08 | 2009-08-10 | 현대자동차주식회사 | Vehicle brake drum and method of manufacturing the same |
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