Brakes – Vehicle – Hub or disk
Reexamination Certificate
2001-03-15
2001-12-18
Schwartz, Christopher P. (Department: 3613)
Brakes
Vehicle
Hub or disk
C188S2180XL, C301S006800
Reexamination Certificate
active
06330937
ABSTRACT:
The present invention relates to a wheel hub and brake disc device for a vehicle wheel, comprising a hub portion mounted via bearing means on an axle end, said hub portion having a cylindrical neck portion with alternating axial grooves and bars, a brake disc having a central opening with corresponding grooves and bars, engaging the bars and grooves in the neck portion to fix rotationally the brake disc on the hub portion, and an open retainer ring, held in a peripheral groove in the neck portion for axially fixing the brake disc in one direction on the hub portion.
SE-A-9201710-2 and SE-A-9602385-8 describe as known, wheel hub and brake disc devices, in which the neck portion of the hub is provided with external splines engaging internal splines in a central opening in the brake disc. The brake disc is fixed axially between outer and inner retainer rings disposed in grooves in the neck portion of the hub. The inner retainer ring fixes a resilient ring, which is in contact with the hub and the disc and permits limited axial movement between the disc and the hub, to compensate for tolerances and deformation occurring in the components when braking. The outer retainer ring is disposed in direct contact with a side surface of the brake disc and forms a rigid end abutment, which limits the outward axial movement of the disc.
As shown in the examples, retainer rings are used either with rectangular cross section (SE-A-9201710-2) or circular cross section (SE-A-9602385-8). Both are open rings with end portions, having end surfaces facing each other, and both have both advantages and disadvantages. The surface pressure of the rectangular ring against the brake disc is lower than that of the ring with circular cross section, but it can, on the other hand, under certain conditions, expand when there is relative movement between the hub and the disc, due to a sort of climbing effect between the retainer ring and the disc. This effect is avoided with a ring of circular cross section, but the surface pressure increases on the other hand. None of the retainer rings has fixation rings for preventing rotation relative to the hub and the disc, and this means that the increased surface pressure with the circular cross section results in increased wear.
The purpose of the present invention is in general to achieve a wheel hub and brake disc device of the type described by way of introduction, which has a retainer ring arrangement, which provides lower wear than the known solution described above with a retainer ring with circular cross section, at the same time as one eliminates the climbing effect with the risk that the ring will jump out of its position.
This is achieved according to the invention by virtue of the fact that the retainer ring has end portions facing each other, of which at least one is bent radially inwards and extends into a recess in the neck portion to fix rotationally the retainer ring on the neck portion.
A ring rotationally fixed in this manner eliminates wear caused by friction due to movement, and this means that despite the higher surface pressure, it is possible to use a ring of circular cross section and which does not have the tendency to climb of the ring having rectangular cross section.
In a further development of the device according to the invention, the brake disc has a peripheral groove in conjunction with its central opening, said peripheral groove having a profile adapted to the cross-sectional profile of the retainer ring, with a peripheral surface, which projects over and is disposed slightly spaced from the radially outer surface of the retainer ring to prevent the retainer ring from expanding radially. This permits the use of a ring with a flat surface in contact with the brake disc, which provides low surface pressure and minimum wear without any risk that its position relative to the hub and the brake disc will be changed.
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patent: 3860095 (1975-01-01), Morris
patent: 4186824 (1980-02-01), Preston et al.
patent: 5507367 (1996-04-01), Dagh et al.
patent: 5540303 (1996-07-01), Bodin et al.
patent: 5568846 (1996-10-01), Dagh et al.
patent: 0 875 433 (1998-11-01), None
patent: 2 194 288 (1988-03-01), None
Carlsson Anders
Dagh Ingemar
Schwartz Christopher P.
Torres Melanie
Volvo Lastvagnar AB
Young & Thompson
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