FLOATING SEAL FOR EARTH BORING BIT

An earth boring bit has a bearing seal that floats to accommodate angular and axial movement of the cutter 31 with respect to the shaft 15. The seal is located in an annular groove 17 formed in the shaft 15. A supporting ring 23 is located in the groove 17. The supporting ring 23 has an inner diamet...

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Bibliographic Details
Main Author ZAHRADNIK ANTON F
Format Patent
LanguageEnglish
Published 30.03.1983
Edition3
Subjects
BLASTING
CYLINDERS
EARTH DRILLING
EARTH DRILLING, e.g. DEEP DRILLING
ENGINEERING ELEMENTS AND UNITS
FIXED CONSTRUCTIONS
GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVEFUNCTIONING OF MACHINES OR INSTALLATIONS
HEATING
LIGHTING
MECHANICAL ENGINEERING
MINING
OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR ASLURRY OF MINERALS FROM WELLS
PISTONS
SEALINGS
THERMAL INSULATION IN GENERAL
WEAPONS
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Summary:An earth boring bit has a bearing seal that floats to accommodate angular and axial movement of the cutter 31 with respect to the shaft 15. The seal is located in an annular groove 17 formed in the shaft 15. A supporting ring 23 is located in the groove 17. The supporting ring 23 has an inner diameter larger than the inner diameter of the groove 17 to provide a clearance for allowing the supporting ring to float. An elastomeric ring 29 is located on the outer circumference of the supporting ring 23. The supporting ring 23 presses the elastomeric ring into sealing contact with the cutter. A backing ring 27 is provided between the elastomeric ring 29 and one wall of the groove 17, the back-up ring 27 preventing cuttings formed during boring operations from coming into contact with the elastomeric ring 29. The ring 29 is under compression between the back-up ring 27 and the opposing wall of the grooves.
Bibliography:Application Number: ZA19820003026