Bearing clearance adjustment
Number of patents in Portfolio can not be more than 2000
United States of America Patent
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-
Sep 16, 1997
Grant Date -
N/A
app pub date -
Nov 13, 1995
filing date -
Nov 13, 1995
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
The comminution apparatus comprises a drive shaft having a roller bearing which is disposed in a housing. A temperature detector mounted in the housing monitors the temperature of the roller bearing. Hydraulic fluid is supplied to a circumferential groove in the housing to apply hydraulic pressure to the outer raceway. The hydraulic fluid pressure is monitored by a pressure detector and gage and may be vented by a manually operated relief valve. The drive shaft is rotated at normal operating speed and normal load with the bearing clearance at maximum until the bearing reaches an equilibrium temperature. Raising the hydraulic pressure develops a force on the rear surface of the outer raceway, biasing the outer raceway towards the shaft and reducing the bearing clearance. Reducing the bearing clearance reduces waste heat generated by skidding between the rollers and the raceway. When the bearing clearance is reduced to the optimum clearance, the skidding is eliminated and the bearing temperature reaches a minimum value. Further reduction of the bearing clearance imposes a preload on the rollers, increasing the friction between the rollers and the raceways and generating waste heat. The pressure is lowered to the pressure that correlates with the minimum temperature.
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