Metal working – Method of mechanical manufacture – Process for making bearing or component thereof
Patent
1995-12-12
1999-12-21
Bryant, David P.
Metal working
Method of mechanical manufacture
Process for making bearing or component thereof
2989807, 2940702, 2940704, 2940705, 7386223, B23P 1500
Patent
active
060032294
ABSTRACT:
An apparatus and method of precisely preloading a bearing onto a shaft is disclosed. The apparatus includes a base plate and a support mounted to and extending upward from the base plate. The support is capable of supporting a shaft. The shaft has a shoulder, a tapered surface adjacent to the shoulder and a threaded portion adjacent to the tapered surface. A shim is positioned on the shaft adjacent to the shoulder and a bearing is positioned adjacent to the shim. The bearing has an inner race, an outer race and a plurality of roller elements positioned therebetween. The bearing is preloaded onto the shaft by a lock nut which is secured to the threaded portion of the shaft and which contacts the inner race of the bearing. The apparatus further includes a motor mounted to the base plate and an output shaft which is axially aligned with and connectable to the outer race of the bearing. The motor is capable of rotating the outer race of the bearing at a predetermined speed. A force sensor is attached to the motor which is capable of measuring the amount of torque required to rotate the outer race at a predetermined speed. The measured torque is then visually displayed on a display unit. When the measured torque is within the predetermined torque range, the bearing will be precisely loaded. The method includes sliding a first shim onto the support shaft until it abuts the shoulder. The first shim has a predetermined thickness. A bearing is then slid onto the tapered surface and a lock nut is tightened onto the threaded portion of the shaft. As the lock nut contacts the inner race of the bearing it causes the inner race to contact the first shim and also to radially expand outwardly, thereby preloading the bearing. The outer race of the bearing is then connected to a motor and the motor is operated at a predetermined, constant speed. The torque required to rotate the outer race of the bearing is measured and compared to a predetermine torque range to determine if the bearing is precisely preloaded.
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Beduhn Mark William
Howard, Jr. Jimmy Harrell
Bryant David P.
Butler Marc W.
Connelly Thomas J.
Glantz Douglas G.
Kimberly--Clark Worldwide, Inc.
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