Brakes – Wheel – Continuous
Patent
1998-05-29
2000-09-19
Oberleitner, Robert J.
Brakes
Wheel
Continuous
188 727, F16D 5500
Patent
active
061198242
ABSTRACT:
A braked mechanical joint assembly is disclosed herein comprising: a) a first brake member; b) a second brake member rotatable relative to the first brake member; c) a friction member positioned between the first and second brake members; (d) means for pushing the first and second brake members together, thereby frictionally engaging them with the friction member so as to oppose relative rotation of the brake members. A resting braking torque is set at the resting position of the joint by initial adjustment of the pushing means.
A larger braking torque is produced at other joint positions by providing the joint assembly with a bearing assembly for varying the braking torque with movement of the joint. The bearing assembly may comprise mating bearing grooves or raceways provided on pushing means and at least one of the brake members. The depth of each groove varies over its course, having a deepest segment corresponding to each of several bearings (ball or roller bearings) in the groove. When the joint is in its resting position, a bearing is received in each of these deepest segments, the pushing force exerted by the pushing means is at its minimum (i.e., rest position) value, and the braking torque is at its minimum value. As the joint moves away from its resting position, relative rotation of the grooves of the brake member and pushing means causes the bearings to roll out of the deepest segments of the grooves and into shallower segments of the grooves. As the bearings roll into shallower portions of the groove, the cam action of the bearings in the grooves results in increasing pushing force exerted by the pushing means and therefore increased braking torque. By tailoring the depth profile of the groove as a function of joint position, any desired pushing force/brake torque vs. joint position behavior can be achieved.
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Alavi David S.
Oberleitner Robert J.
Williams Tom
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