Ventilated disc brake rotor

Details Ventilated disc brake rotor Ventilated disc brake rotor

1999-06-04

2001-06-05

Oberleitner, Robert J. (Department: 3613)

Brakes

Wheel

Axially movable brake element or housing therefor

C188S2180XL, C188S2640AA

Reexamination Certificate

active

06241053

ABSTRACT:

BACKGROUND OF THE INVENTION
The present invention relates to disc brakes and more specifically ventilated rotors or discs for disc brakes.
The recent demand for better fuel efficiency and weight reduction of motor vehicles involves the demand for more light-weight brake units.
For reducing the weight of a ventilated rotor (or disc) having two parallel discs, the reduction of wall thicknesses of the discs is effective. However, thin wall discs may adversely influence the heat absorbing performance and braking performance. In particular, this tendency is strong in front disc brakes which must bear 60~80% of the braking load of a vehicle.
Japanese Patent Kokai Publication No. 6(1994)-129452 and Japanese Patent Kokai Publication No. 8(1996)-74900 disclose ventilated rotors having tapered inside surfaces designed to improve the cooling efficiency.
SUMMARY OF THE INVENTION
It is an object of the present invention to provide ventilated rotors having improved thermal properties to achieve the weight reduction without sacrificing the braking performance.
According to illustrated embodiments of the present invention, a ventilated disc brake rotor comprises first and second discs and a plurality of radial ribs.
The first disc comprises opposite outside and inside wall surfaces, and the outer wall surface comprises a first braking surface. The second disc comprises opposite outside and inside wall surfaces, and the inside wall surfaces of the first and second discs confront each other.
The radial ribs extend between the first and second discs and define cooling air passages between the inside wall surfaces of the first and second discs.
The first disc further comprises a raised portion which is raised from the inside wall surface of the first disc toward the second disc, by an amount to increase a wall thickness of the first disc preferably by 10%~40%, and which extends radially from an outer radial position at which an outer circumference of the first braking surface lies, to an intermediate radial position intermediate between the outer radial position and an inner radial position at which an inner circumference of the first braking surface lies. The radial dimension of the raised portion defined between the outer radial position and the intermediate radial position is equal to or greater than {fraction (1/10)} of the radial width of the first braking surface between the outer and inner radial positions, and equal to or less than ½ of the radial width of the first braking surface between the outer and inner radial positions.


REFERENCES:
patent: 5706915 (1998-01-01), Shimazu et al.
patent: 6032769 (2000-03-01), Daudi
patent: 4323782 (1994-01-01), None
patent: 5321959 (1993-12-01), None
patent: 6-129452 (1994-05-01), None
patent: 6249274 (1994-09-01), None
patent: 8074900 (1996-03-01), None
patent: 10-318302 (1998-12-01), None
patent: 11287268 (1999-10-01), None

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