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EP0067230A1 - Sliding member - Google Patents

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Publication number
EP0067230A1
EP0067230A1 EP81903225A EP81903225A EP0067230A1 EP 0067230 A1 EP0067230 A1 EP 0067230A1 EP 81903225 A EP81903225 A EP 81903225A EP 81903225 A EP81903225 A EP 81903225A EP 0067230 A1 EP0067230 A1 EP 0067230A1
Authority
EP
European Patent Office
Prior art keywords
metallic material
sliding member
amorphous metallic
sliding
magnetic tape
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.)
Withdrawn
Application number
EP81903225A
Other languages
German (de)
French (fr)
Other versions
EP0067230A4 (en
Inventor
Shiro Takahashi
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sony Corp
Original Assignee
Sony Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Sony Corp filed Critical Sony Corp
Publication of EP0067230A1 publication Critical patent/EP0067230A1/en
Publication of EP0067230A4 publication Critical patent/EP0067230A4/en
Withdrawn legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B15/00—Driving, starting or stopping record carriers of filamentary or web form; Driving both such record carriers and heads; Guiding such record carriers or containers therefor; Control thereof; Control of operating function
    • G11B15/60—Guiding record carrier
    • G11B15/61—Guiding record carrier on drum, e.g. drum containing rotating heads
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C45/00—Amorphous alloys
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B15/00—Driving, starting or stopping record carriers of filamentary or web form; Driving both such record carriers and heads; Guiding such record carriers or containers therefor; Control thereof; Control of operating function
    • G11B15/60—Guiding record carrier
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/12—All metal or with adjacent metals
    • Y10T428/12993—Surface feature [e.g., rough, mirror]

Definitions

  • the present invention relates to a sliding member and, more particularly, to a sliding member in which a sliding surface is made of an amorphous metallic material.
  • the sliding member of the present invention may be for instance applied to a head drum, a tape guide and the like of a video tape recorder.
  • a sliding member such as a tape guide or a head drum for guiding magnetic tape must have a small coefficient of friction with magnetic tape and an excellent abrasion resistance.
  • Aluminum alloys widely adopted as conventional materials for the sliding members such as a head drum have drawbacks in that they are easy to wear because of their relatively great coefficients of friction and low hardnesses. Therefore, the magnetic tape adheres to the sliding members made of aluminum alloys and may not run smoothly for this reason, or the magnetic tape causes squeaking. These phenomena are notable especially when the magnetic tape is run under the condition of relatively high temperature and humidity.
  • the sliding surface is made of an amorphous metallic material, so that the coefficient of friction with magnetic tape is small; besides the hardness is high, and especially running characteristics of the tape are excellent.
  • any amorphous metallic material may be used in the present invention as long as it satisfies the purpose to be accomplished by the sliding member of the present invention.
  • Examples of such an amorphous metallic material may include those materials which contain transition metal elements such as Fe, Co or Ni or metal elements such as Cr in the atomic ratio of about 60 to 90%, or those materials which contain metalloids such as P, C, B or Si in the atomic ratio of about 40 to 10%.
  • the overall sliding member may be made of an amorphous metallic material.
  • the method for manufacturing only the sliding surface of the sliding member from an amorphous metallic material is not particularly limited; a conventional method may be adopted.
  • an amorphous metallic material is formed into a ribbon of a 20 to 30 p thickness and the ribbon then adheres to the surface of a sliding member main body, which was made of another material to provide a sliding surface.
  • the amorphous metallic material may be easily formed into a ribbon by a rolling rapid cooling apparatus which is disclosed, for example, in Japanese Patent Application No. 52-22936 (Japanese Laid-Open Patent Application No.
  • the amorphous metallic material may be easily formed into a ribbon by the double-roller method, the single-roller method, the liquid rapid cooling method or the like.
  • a sliding member of desired shape may be prepared by the conventional forming.
  • the amorphous metallic materials as described above are easy to work with as compared with ferrite or ceramic and are thus advantageous.
  • the amorphous metallic materials have smaller coefficients of friction and higher hardnesses than those of aluminum, Sendust and ferrite. Furthermore, if the surface roughness is less than about +2 , the amorphous metallic material has an extremely small coefficient of friction. Therefore, the amorphous metallic material provides a surface of an excellent quality without special finish.
  • the amorphous metallic material has magnetization lower than that of ferrite or the like and has electrification lower than that of ceramic.
  • the amorphous metallic material is particularly suitable for a material to make up the sliding surface of the sliding member.
  • a head drum of a video tape recorder shown in Fig. 1 is of three-layered structure including an upper stationary cylinder 1, a lower stationary cylinder 2 and a rotary head cylinder 3.
  • a pair of magnetic heads 4 are mounted on the rotary head cylinder.
  • An amorphous metallic material layer 5 is formed on the tape sliding surface of each cylinder. Referring to Fig. 1, the material layer is formed by having a ribbon of an amorphous metallic material adhere to that part of the main body which will become the tape sliding surface.
  • a lead 6 for guiding magnetic tape is mounted on the lower stationary cylinder 2
  • this lead may be formed by having the other amorphous metallic material layer 7 adhere to the outer surface of the amorphous metallic material layer 5 so that the upper end of the layer 7 may serve as a lead.
  • the amorphous metallic material is made into a ribbon whose shape has a lead
  • another method to form a lead may be offered by having such ribbon adhere to the main body of the sliding member.
  • a step corresponding to the lead is formed on a cooling roller for rapidly cooling a melted amorphous metallic material, and the amorphous metallic material is rapidly cooled thereon.
  • the amorphous metallic material layer may be formed on that part of the member which will be brought into sliding contact with magnetic tape and need not therefore be formed on the entire surfaces of the cylinders. If the sliding part or part of the sliding member alone is made of an amorphous metallic material, the rest of the member may be made of a conventional material such as a hard plastic or an aluminum alloy.
  • Fig. 2 shows an AC head (audio/control head) of a video tape recorder to which a sliding member of the present invention is applied.
  • Magnetic heads 10 and 11 for recording audio and control signals respectively are mounted on the upper and lower side edges of the AC head.
  • An amorphous metallic material layer 12 adheres to the sliding part between the magnetic heads.
  • Fig. 3 shows a guide pin to which a sliding member of the present invention is applied.
  • an amorphous metallic material layer 15 adheres to the tape sliding surface.
  • the coefficient of friction between the sliding surface and magnetic tape is small and the sliding surface has a high hardness. Therefore, adhesion of the magnetic tape to the sliding member may be prevented and excellent running characteristics of the magnetic tape may be guaranteed.
  • the amorphous metallic material is easy to work with and is effective to lower the manufacturing cost of the member.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Registering, Tensioning, Guiding Webs, And Rollers Therefor (AREA)
  • Magnetic Heads (AREA)

Abstract

A sliding member made with amorphous metallic material on the sliding surface. The sliding member has a small coefficient of friction with magnetic tape by constructing the member in this manner together with high hardness. Accordingly, it can prevent magnetic tape from adhering to the member and thus has excellent running characteristic.

Description

    Technical Field
  • The present invention relates to a sliding member and, more particularly, to a sliding member in which a sliding surface is made of an amorphous metallic material. The sliding member of the present invention may be for instance applied to a head drum, a tape guide and the like of a video tape recorder.
    • Background Art
  • In a video tape recorder or the like, a sliding member such as a tape guide or a head drum for guiding magnetic tape must have a small coefficient of friction with magnetic tape and an excellent abrasion resistance. Aluminum alloys widely adopted as conventional materials for the sliding members such as a head drum, have drawbacks in that they are easy to wear because of their relatively great coefficients of friction and low hardnesses. Therefore, the magnetic tape adheres to the sliding members made of aluminum alloys and may not run smoothly for this reason, or the magnetic tape causes squeaking. These phenomena are notable especially when the magnetic tape is run under the condition of relatively high temperature and humidity.
    • Disclosure of Invention
  • In a sliding member of the present invention, the sliding surface is made of an amorphous metallic material, so that the coefficient of friction with magnetic tape is small; besides the hardness is high, and especially running characteristics of the tape are excellent.
  • Brief Description of Drawings
    • Fig. 1 is a sectional view wherein a sliding member of the present invention is applied to a head drum of a video tape recorder.
    • Fig. 2 is an exploded perspective view wherein a sliding member of the present invention is applied to an AC head of a video tape recorder.
    • Fig. 3 is an exploded perspective view wherein a sliding member of the present invention is applied to a guide pin.
    Best Mode of Carrying Out the Invention
  • Any amorphous metallic material may be used in the present invention as long as it satisfies the purpose to be accomplished by the sliding member of the present invention. Examples of such an amorphous metallic material may include those materials which contain transition metal elements such as Fe, Co or Ni or metal elements such as Cr in the atomic ratio of about 60 to 90%, or those materials which contain metalloids such as P, C, B or Si in the atomic ratio of about 40 to 10%.
  • For the present invention, it suffices that only the sliding surface of the sliding member is made of an amorphous metallic material. However, the overall sliding member may be made of an amorphous metallic material. The method for manufacturing only the sliding surface of the sliding member from an amorphous metallic material is not particularly limited; a conventional method may be adopted. For instance, an amorphous metallic material is formed into a ribbon of a 20 to 30 p thickness and the ribbon then adheres to the surface of a sliding member main body, which was made of another material to provide a sliding surface. The amorphous metallic material may be easily formed into a ribbon by a rolling rapid cooling apparatus which is disclosed, for example, in Japanese Patent Application No. 52-22936 (Japanese Laid-Open Patent Application No. 53-106339) or in Japanese Patent Application No. 52-22937 (Japanese Laid-Open Patent Application No. 53-106340). Needless to say, the amorphous metallic material may be easily formed into a ribbon by the double-roller method, the single-roller method, the liquid rapid cooling method or the like. - If the overall sliding member is made of an amorphous metallic material, a sliding member of desired shape may be prepared by the conventional forming. The amorphous metallic materials as described above are easy to work with as compared with ferrite or ceramic and are thus advantageous.
  • A comparison of coefficients of friction and Vickers Hardness (Hv) between various types of materials and the amorphous metallic material will be shown in the table below:
    Figure imgb0001
  • As may be seen from the above table, the amorphous metallic materials have smaller coefficients of friction and higher hardnesses than those of aluminum, Sendust and ferrite. Furthermore, if the surface roughness is less than about +2 , the amorphous metallic material has an extremely small coefficient of friction. Therefore, the amorphous metallic material provides a surface of an excellent quality without special finish.
  • The amorphous metallic material has magnetization lower than that of ferrite or the like and has electrification lower than that of ceramic.
  • As has been described above, the amorphous metallic material is particularly suitable for a material to make up the sliding surface of the sliding member.
  • The present invention will further be described with reference to the accompanying drawings.
  • A head drum of a video tape recorder shown in Fig. 1 is of three-layered structure including an upper stationary cylinder 1, a lower stationary cylinder 2 and a rotary head cylinder 3. A pair of magnetic heads 4 are mounted on the rotary head cylinder. An amorphous metallic material layer 5 is formed on the tape sliding surface of each cylinder. Referring to Fig. 1, the material layer is formed by having a ribbon of an amorphous metallic material adhere to that part of the main body which will become the tape sliding surface.
  • Although a lead 6 for guiding magnetic tape is mounted on the lower stationary cylinder 2, this lead may be formed by having the other amorphous metallic material layer 7 adhere to the outer surface of the amorphous metallic material layer 5 so that the upper end of the layer 7 may serve as a lead. If the amorphous metallic material is made into a ribbon whose shape has a lead, another method to form a lead may be offered by having such ribbon adhere to the main body of the sliding member. In order to form a ribbon of such a shape with a rolling rapid cooling apparatus as described above, a step corresponding to the lead is formed on a cooling roller for rapidly cooling a melted amorphous metallic material, and the amorphous metallic material is rapidly cooled thereon.
  • According to the present invention, the amorphous metallic material layer may be formed on that part of the member which will be brought into sliding contact with magnetic tape and need not therefore be formed on the entire surfaces of the cylinders. If the sliding part or part of the sliding member alone is made of an amorphous metallic material, the rest of the member may be made of a conventional material such as a hard plastic or an aluminum alloy.
  • Fig. 2 shows an AC head (audio/control head) of a video tape recorder to which a sliding member of the present invention is applied. Magnetic heads 10 and 11 for recording audio and control signals respectively are mounted on the upper and lower side edges of the AC head. An amorphous metallic material layer 12 adheres to the sliding part between the magnetic heads.
  • Fig. 3 shows a guide pin to which a sliding member of the present invention is applied. In this guide pin, an amorphous metallic material layer 15 adheres to the tape sliding surface. Industrial Applicability
  • Since that part of the sliding member of the present invention which corresponds to the sliding surface is made of an amorphous metallic material, the coefficient of friction between the sliding surface and magnetic tape is small and the sliding surface has a high hardness. Therefore, adhesion of the magnetic tape to the sliding member may be prevented and excellent running characteristics of the magnetic tape may be guaranteed. The amorphous metallic material is easy to work with and is effective to lower the manufacturing cost of the member.

Claims (6)

1. A sliding member characterized in that a sliding surface is made of an amorphous metallic material.
2. A sliding member according to claim 1, characterized in that the amorphous metallic material is a metal element and a metalloid element.
3. A sliding member according to claim 2, characterized in that the metal element is transition metal elements such as Fe, Co and Ni, or Cr or the like.
4. A sliding member according to claim 2, characterized in that the metalloid element is P, C, B Si, or the like.
5. A sliding member according to any one of claims 2 to 4, characterized in that the metal element is contained in an atomic ratio of about 60% to about 90% and the metalloid element is contained in an atomic ratio of about 40% to about 10%.
6. A sliding member according to any one of claims 1 to 5, characterized in that the amorphous metallic material is of Fe-Co-Si-B type.
EP19810903225 1980-12-05 1981-12-04 Sliding member. Withdrawn EP0067230A4 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP1980174654U JPS606907Y2 (en) 1980-12-05 1980-12-05 sliding member
JP174654/80U 1980-12-05

Publications (2)

Publication Number Publication Date
EP0067230A1 true EP0067230A1 (en) 1982-12-22
EP0067230A4 EP0067230A4 (en) 1983-08-03

Family

ID=15982363

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19810903225 Withdrawn EP0067230A4 (en) 1980-12-05 1981-12-04 Sliding member.

Country Status (5)

Country Link
US (1) US4523245A (en)
EP (1) EP0067230A4 (en)
JP (1) JPS606907Y2 (en)
NL (1) NL8120452A (en)
WO (1) WO1982001896A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2010108869A1 (en) * 2009-03-21 2010-09-30 Schaeffler Technologies Gmbh & Co. Kg Metallic component, in particular rolling bearing, engine or transmission component

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4555186A (en) * 1984-02-10 1985-11-26 Dresser Industries, Inc. Amorphous alloy plain bearings
US6015627A (en) * 1990-08-03 2000-01-18 Sony Corporation Magnetic head drum and method of manufacturing same
US5321681A (en) * 1990-11-21 1994-06-14 Image Premastering Services, Ltd. Apparatus for recording, storing and electronically accessing images

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2605615A1 (en) * 1975-02-15 1976-09-02 Tdk Electronics Co Ltd MAGNETIC HEAD
GB2011149A (en) * 1977-12-20 1979-07-04 Bogen W Magnetic heads

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US3940293A (en) * 1972-12-20 1976-02-24 Allied Chemical Corporation Method of producing amorphous cutting blades
US3871836A (en) * 1972-12-20 1975-03-18 Allied Chem Cutting blades made of or coated with an amorphous metal
US4038073A (en) * 1976-03-01 1977-07-26 Allied Chemical Corporation Near-zero magnetostrictive glassy metal alloys with high saturation induction
JPS59582B2 (en) * 1976-03-23 1984-01-07 東北大学金属材料研究所長 Amorphous alloy for magnetic heads with low magnetostriction and high wear resistance and its manufacturing method
JPS5325409A (en) * 1976-08-20 1978-03-09 Sony Corp Magnetic head
US4152144A (en) * 1976-12-29 1979-05-01 Allied Chemical Corporation Metallic glasses having a combination of high permeability, low magnetostriction, low ac core loss and high thermal stability
JPS5393807A (en) * 1977-01-28 1978-08-17 Hitachi Ltd Guide drum for magnetic tape
JPS6037179B2 (en) * 1977-02-24 1985-08-24 ティーディーケイ株式会社 amorphous magnetic alloy
JPS6035420B2 (en) * 1977-02-18 1985-08-14 ティーディーケイ株式会社 Thermally stable amorphous magnetic alloy
DE2722509C2 (en) * 1977-05-18 1987-05-14 Basf Ag, 6700 Ludwigshafen Tape guide device for high-speed magnetic tape devices
JPS5420918A (en) * 1977-07-16 1979-02-16 Allied Chem Amorphous alloy with improved brittle resistance at heat treating
JPS54138411A (en) * 1978-04-19 1979-10-26 Matsushita Electric Ind Co Ltd Magnetic recorder-reproducer
SU830553A1 (en) * 1979-07-10 1981-05-15 Вильнюсское Отделение Всесоюзногонаучно-Исследовательскогопроектно-Конструкторского Итехнологического Института Малыхэлектрических Машин Magnetic tape guiding device
JPS5644752A (en) * 1979-09-21 1981-04-24 Hitachi Ltd Ferromagnetic amorphous alloy
JPS56156917A (en) * 1980-05-06 1981-12-03 Matsushita Electric Ind Co Ltd Magnetic head
JPS5754251A (en) * 1980-09-15 1982-03-31 Tdk Corp Amorphous magnetic alloy material
JPS5789450A (en) * 1980-11-21 1982-06-03 Matsushita Electric Ind Co Ltd Amorphous magnetic alloy
JP3261715B2 (en) * 1991-12-24 2002-03-04 日本電気株式会社 I / O data transfer processor
JP2924459B2 (en) * 1992-06-16 1999-07-26 富士電機株式会社 Pre-soldering method for lead frame

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DE2605615A1 (en) * 1975-02-15 1976-09-02 Tdk Electronics Co Ltd MAGNETIC HEAD
GB2011149A (en) * 1977-12-20 1979-07-04 Bogen W Magnetic heads

Non-Patent Citations (1)

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Title
See also references of WO8201896A1 *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2010108869A1 (en) * 2009-03-21 2010-09-30 Schaeffler Technologies Gmbh & Co. Kg Metallic component, in particular rolling bearing, engine or transmission component

Also Published As

Publication number Publication date
US4523245A (en) 1985-06-11
JPS5798566U (en) 1982-06-17
JPS606907Y2 (en) 1985-03-07
NL8120452A (en) 1982-11-01
EP0067230A4 (en) 1983-08-03
WO1982001896A1 (en) 1982-06-10

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PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

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Designated state(s): FR

17P Request for examination filed

Effective date: 19821203

STAA Information on the status of an ep patent application or granted ep patent

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18D Application deemed to be withdrawn

Effective date: 19850920

RIN1 Information on inventor provided before grant (corrected)

Inventor name: TAKAHASHI, SHIRO