Sliding member

Details Sliding member Sliding member

1982-08-04

1985-06-11

Skiff, Peter K.

Dynamic magnetic information storage or retrieval

Head

Head accessory

428687, 242179, 148403, G11B 510, G11B 540

Patent

active

045232458

DESCRIPTION:

BRIEF SUMMARY
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 mede 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.mu. 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:


TABLE ______________________________________ Coefficient Vickers Material of Friction Hardness _________________________________

REFERENCES:
patent: 3871836 (1975-03-01), Polk et al.
patent: 3940293 (1976-02-01), Polk et al.
patent: 4152144 (1979-05-01), Hasegawa et al.
patent: 4163266 (1979-07-01), Tamamura et al.
patent: 4276575 (1981-06-01), Schoettle et al.
patent: 4306908 (1981-12-01), Takayama et al.
patent: 4416709 (1983-11-01), Ohya et al.
patent: 4437912 (1984-03-01), Sakakima et al.

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