Brakes – Vehicle – Hub or disk
Patent
1994-11-14
1996-07-30
Oberleitner, Robert J.
Brakes
Vehicle
Hub or disk
B60T 106
Patent
active
055403034
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a wheel hub and brake disc arrangement for heavy vehicles, bolted a hub portion rotatably carried by bearing means on a stub axle, said hub portion presenting a region to which a brake disc is non rotatably affixed, and a disc-shaped carrier affixed to the hub portion via a screw connection, to which carrier a wheel rim is intended to be bolted.
2. Description of Related Art
Disc brakes, which until now have almost without exception only been used on cars and lighter commercial vehicles, have recently been further developed for use in the heaviest category of trucks in which the braking moment can reach 2000 kpm. In the known disc brake type for this class of vehicle the brake disc and the "wheel disc", i.e. the disc-shaped carrier to which the wheel rim is intended to be bolted, is affixed to the wheel hub via a common screw connection. In such a construction, the entire braking moment acts through the screw connection. This implies that the connection must be dimensioned so as to accommodate very large forces. High demands are thus placed on the assembly work during, for example, replacement of brake discs, for example that the correct tightening torque is applied to the common screw connection, in order to eliminate the risk of failure attributable to too great stresses in the connection.
3. Objects and Summary
It is an object of the present invention to provide a wheel hub and brake disc arrangement of the above mentioned type in which the disadvantages of a common screw connection for the brake disc and the disc-shaped carrier can be eliminated.
The present invention relates to a wheel hub and brake disc arrangement for heavy vehicles, comprising a hub portion rotatably carried by bearing means on a stub axle, said hub portion presenting a region to which a brake disc is nonrotatably affixed, and a disc-shaped carrier affixed to the hub portion via a screw connection, to which carrier a wheel rim is intended to be bolted.
This is achieved in accordance with the invention by means of the disc-shaped carrier being integrally formed with a region located radially externally of said screw connection, said region having a non-circular external shaping onto which a brake disc having an opening which presents a corresponding internal shaping is non-rotatably affixed.
By forming an externally shaped disc carrying region integrally with the "wheel disc", an interlocking connection with the brake disc is created in the direction of rotation. The braking moment is thus transmitted through the interlocking connection without having to pass through the screw connection. This implies that the screw connection does not need to be dimensioned to accommodate the very high braking moments which arise during heavy braking of commercial vehicles of the heaviest category.
BRIEF DESCRIPTION OF THE DRAWINGS
The invention will be described in greater detail in the following with reference to the embodiments shown in the attached drawings in which
FIG. 1 shows a longitudinal sectional view through a portion of a previously known wheel hub and brake disc arrangement and
FIG. 2 shows a corresponding longitudinal sectional view through an embodiment of a wheel hub and brake disc arrangement according to the invention.
DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS
The wheel hub and brake disc arrangement in FIG. 1 comprises a stub axle 1 which supports a so called "unit bearing" denoted generally by 2, the outer race 3 of which is formed with a radial ring-shaped flange 4 and forms the actual wheel hub. The flange 4 is provided with a plurality of, for example ten, uniformally distributed threaded bores 5. A disc-shaped carrier 6, the so called wheel disc to which a wheel rim 7 is bolted, and the brake disc 8 are affixed to the flange 4 by means of screws 9 which extend through bores 10 in a radial flange 11 on the wheel disc 6 and bores 12 in a radial flange 13 on a hollow circular portion 14 integrally formed with the brake disc 8.
In
REFERENCES:
patent: 3941221 (1976-03-01), Pringle
patent: 4890699 (1990-01-01), Megginson
patent: 5137123 (1992-08-01), Setogawa
patent: 5255761 (1993-10-01), Zaremsky
patent: 5348122 (1994-09-01), Brundrett
Bodin Jan-Olof
Dagh Ingemar
AB Volvo
Bartz C. T.
Oberleitner Robert J.
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