Spring devices – Bendable along flat surface – Ring or annular spider
Patent
1999-01-05
1999-11-23
Schwartz, Chris
Spring devices
Bendable along flat surface
Ring or annular spider
188 18A, 192 8922, 411536, 411544, F16F 134
Patent
active
059886137
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates to a wheel hub and brake disc arrangement for a vehicle wheel, comprising a hub mounted via bearing means on a stub axle, a brake disc non-rotatably mounted on a carrier portion of the hub, and a lock ring axially fixed at an end of the carrier portion, said lock ring having a first side surface lying in contact with a surface on the brake disc and a second side surface, located radially inwardly of the first side surface, said second side surface being in contact with a surface on the hub, and said lock ring permitting, during resilient movement upon axial loading of the brake disc, limited axial displacement of the brake disc relative to the carrier portion.
The invention relates also to a resilient lock ring which is particularly, but not exclusively, intended for a wheel hub and brake disc arrangement for a vehicle wheel.
SE-A-501 006, for example, reveals as previously known a wheel hub and brake disc arrangement, in which the carrier portion of the hub is provided with exterior splines engaging interior splines in a central opening in the brake disc. The brake disc is fixed axially by means of outer and inner lock rings held in grooves in the carrier portion of the hub, of which the inner lock ring axially fixes a resilient ring which has flat parallel opposing side surfaces, one of which having a radially outer portion in contact with a surface on the brake disc and a radially inner portion in contact with a surface of the hub. The resilient ring permits limited axial movement between the disc and the hub to compensate for tolerances and for deformation which occurs in the components involved in braking. The arrangement does not, however, allow for axial pretensioning of the disc, and the result is that. under unfavorable conditions, vibrations can occur during braking.
It is also known to screw a resilient lock ring securely to the wheel hub so that a portion of the side of the ring facing the hub and the brake disc is in contact with the hub and the rest against the disc. The spring distance of the lock ring, i.e. the radial extent of the area between the edge of the surface portion fixed against the hub and the outer edge of the ring, will in this case be relatively short, in a known example circa 3-5 mm. The short spring distance only permits a short axial spring movement which in turn increases the risk of crack formation in comparison to what is the case when there is a long spring distance. Due to the fact that the spring distance is short, the permissible degree of pretensioning is also relatively low.
SUMMARY OF THE INVENTION
The purpose of the present invention is to achieve a wheel hub and brake disc arrangement of the type described by way of introduction which dampens vibrations and reduces the risk of crack formation in a more effective manner than previously.
This is achieved according to the invention by virtue of the fact that the lock ring in the areas between said first and second side surfaces has surfaces which lack contact both with said surface on the brake disc and said surface on the hub.
The design according to the invention reduces the radial extent of the contact surfaces of the ring against the disc and the hub at the same time as the radial distance between the surfaces increases. The intermediate surface which lacks contact with the disc and the hub forms a surface on a resilient "bridge" between the contact surfaces. In this manner the spring distance can be increased approximately four times the spring distance of the known design described above. This in turn decreases the risk of crack formation and the lock ring can be pretensioned significantly more than what was previously possible, which reduces the vibrations.
A preferred embodiment of a resilient lock ring with opposing, at least substantially plane, radial side surfaces, which is particularly suited for use in the wheel hub and brake disc arrangement according to the invention, but which can also be used in other contexts, where one can make use o
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Dagh Ingemar
Fagergren Mats
Schwartz Chris
Volvo Lastvagnar AB
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