Brakes – Elements – Brake wheels
Reexamination Certificate
2000-02-10
2001-09-18
Butler, Douglas C. (Department: 3613)
Brakes
Elements
Brake wheels
C188S25100R
Reexamination Certificate
active
06290031
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a rotary brake part for a vehicle, and more particularly, to a rotary brake part which is rotated with the wheels of the vehicle and is brought into friction contact with a friction member during a braking operation of the vehicle. This type of the rotary brake part corresponds to a brake drum and a brake disk.
2. Description of the Prior Art
There is a conventionally known brake drum which is formed of an aluminum alloy composite material having excellent wear and heat resistances due to the demand for a reduction in weight of the brake drum.
However, when the brake drum formed of the aluminum alloy composite material is combined with a conventional friction member made of a cast iron for the drum, the problem arises in that the friction coefficient is reduced and for this reason, the brake effectiveness is reduced.
Therefore, it is a conventional practice to replace the friction member by a member having a strong attacking property to the friction contact surface forming section of the brake drum by inclusion of a large amount of an abrasive material or the like. However, if such a measure is employed, since the brake drum has a structure in which a worn powder containing the abrasive material and falling dispersions (e.g., SiC grains) are difficult to discharge out from the drum, there arises a new problem in that the worn powder and the like are liable to stay in the drum, and the wearing of the friction contact surface forming section of the brake drum and the friction member becomes excessive due to the abrading action of the worn powder and the like.
The abrading action of the worn powder and the like is varied in level, but causes a problem even in a brake disk having a good worn powder-discharging characteristic.
SUMMARY OF THE INVENTION
It is an object of the present invention to provide a rotary brake part, wherein the excessive wearing of the friction contact surface forming section and the friction member due to the abrading action of the worn powder and the like can be inhibited, and the friction contact surface forming section can be reinforced.
To achieve the above object, according to the present invention, there is provided a rotary brake part which is rotated with a wheel of the vehicle and brought into friction contact with a friction member during a braking operation of the vehicle. The rotary brake part comprises an annular friction contact surface forming section which is comprised of at least one composite portion disposed in a circumferential direction of the friction contact surface forming section and comprising a metal matrix and a large number of dispersions in the metal matrix. At least one metal portion is formed only of a metal.
If the rotary brake part is constructed as described above, it is possible to ensure wear and heat resistances of the friction contact surface forming section and to force worn powder and falling dispersions into the metal portion of the friction contact surface forming section by the urging force of the friction member during a braking operation and to thus retain them in the metal portion. Thus, it is possible to inhibit the excessive wearing in the friction contact surface forming section and the friction member due to the abrading action of the worn powder and the like and to reinforce the metal portion in a composite manner by the forced-in worn powder and the like.
REFERENCES:
patent: 1010787 (1911-12-01), Nilson
patent: 2070847 (1937-05-01), Sargent
patent: 2160598 (1939-05-01), Melrath
patent: 2806559 (1957-09-01), Kerr
patent: 2840195 (1958-06-01), Holton
patent: 2844229 (1958-07-01), Whitfield
patent: 3176804 (1965-04-01), Erickson
patent: 4806333 (1989-02-01), Egerton et al.
patent: 5198007 (1993-03-01), Moyer et al.
patent: 5360329 (1994-11-01), Lemelson
patent: 5660877 (1997-08-01), Venkataramani et al.
patent: 5878849 (1999-03-01), Prunier, Jr. et al.
Kitamura Katsuhiro
Nakamura Koji
Shibata Katsuhiro
Arent Fox Kintner Plotkin & Kahn
Burch Melody M.
Butler Douglas C.
Honda Giken Kogyo Kabushiki Kaisha
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