Brakes – Vehicle – Hub or disk
Patent
1986-01-28
1987-10-20
Kashnikow, Andres
Brakes
Vehicle
Hub or disk
188 716, 188264AA, 301 6CS, B60T 106, F16D 5502, F16D 6578, A63C 1712
Patent
active
047008130
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a wheel assembly including a disc brake for vehicles, consisting of a cup-shaped disc carrier which has a base member secured to a wheel hub, and a drum-type member extending axially inwardly at a small radial spacing from a wheel rim and being firmly connected to the radially outer edge of a brake disc, a brake caliper supported at a stationary wheel bearing box, straddling the radially inner edge of the brake disc, supporting brake pads disposed at either side of the brake disc, and comprising an actuating device at least at one side of the brake disc, and vent passages radially within the wheel rim.
In the case of a known wheel assembly of this kind (GB-A 897 619) the cup-shaped disc carrier is designed to be totally separate from the corresponding wheel and its base member is clamped between the wheel hub and a central portion of a wheel web which is pressed in conventional manner of sheet metal and bolted to the hub of the wheel. The brake disc extends radially inwardly from the edge of the drum-type member, but it includes an annular arrangement of vent holes which is located outside of this edge and ventilation blades serving to produce a flow of air which is to pass between the wheel rim and the outside wall of the drum-type member and to leave the wheel assembly through holes formed in the outer area of the wheel web. Hereby part of the heat generated upon braking at the brake disc and taken up by the drum-type member is to be dissipated by the stream of air. However, it was found that an accumulation of heat at the cup-shaped disc carrier cannot be avoided by these measures upon extended and more vigorous braking so that there is a risk of undue heating occurring not only of the brake itself but, under adverse circumstances, also of the wheel rim and, by way of the wheel hub, of an adjoining wheel bearing.
It is, therefore, the object of the invention to develop a wheel assembly including a disc brake such that the risk of overheating is reduced.
This object is met, in accordance with the invention, in a wheel assembly of the kind specified initially in that the base member of the disc carrier is of double wall design and has an inner chamber which is subdivided into vent passages by ventilation blades which are at least approximately radial.
In this manner the heat transmitted from the brake disc to the drum-type member is dissipated so quickly to the ambient atmosphere by the well aerated base member that the entire disc carrier and consequently also the wheel hub and the wheel bearing are kept relatively cool. Also the disc brake which is arranged substantially within the annular space enclosed by these structural members is prevented from becoming overheated by the measures of the invention better than before. The same is true of the wheel rim to which the disc carrier, remaining relatively cool, transmits correspondingly less heat by radiation and conduction than before. Moreover, the base member of the disc carrier designed in accordance with the invention comprises a greater mass and, therefore, has greater thermal capacity than before so that it can accommodate great quantities of heat from the brake disc within a short time, upon vigorous braking, and dissipate and irradiate the same gradually to the surroundings.
An embodiment of the invention is characterized in that the base member proper of the disc carrier is designed as web of the wheel, that the wheel rim comprises a foot portion which is fixed to the radially outer edge of the base member, and that the vent passages in the base member begin in the range of the wheel hub and terminate near the foot portion.
In the case of a second embodiment of the invention the base member of the disc carrier is arranged axially within an independent wheel web, as with the state of the art assumed to be known. Further substantially radial vent passages are formed between the base member which is double-walled in accordance with the invention, and the wheel web. It is particularly convenient with this second embodiment if
REFERENCES:
patent: 2646862 (1953-07-01), Dodge
patent: 3051271 (1962-08-01), Spannagel et al.
patent: 3623774 (1971-11-01), Funke et al.
patent: 4226304 (1980-10-01), Erdmann
Kashnikow Andres
Lucas Industries Public Limited Company
Oberleitner Robert J.
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