Seal for a joint or juncture – Seal between relatively movable parts – Relatively rotatable radially extending sealing face member
Patent
1985-07-08
1986-09-09
Ward, Robert S.
Seal for a joint or juncture
Seal between relatively movable parts
Relatively rotatable radially extending sealing face member
277 84, 277 92, 277 95, 277166, F16J 1534
Patent
active
046104526
ABSTRACT:
Sealed bearing rotary cone rock bits that utilize a standard belleville seal oftentimes require that the static side of the seal be secured to a junction formed between a shirttail portion and a journal of a leg of the rock bit. A metal ring on the static side of the belleville seal is secured to the junction between the journal and the shirttail portion of the leg and imposes a load on the inner diameter of an encapsulated belleville spring. By preloading the inner diameter of the belleville spring, the load on the spring continues to increase as the spring is deflected during use. The present invention utilizes an isolated encapsulated belleville spring such that the inner diameter of the belleville spring is not trapped between the metallic ring on the static side of the seal. The result is that as the deflection of the spring is increased under operating conditions, the load reaches a peak value and then begins to decrease. The belleville spring in the isolated state thus can endure large amounts of wear with little or no loss in load or contact pressure.
REFERENCES:
patent: 2294105 (1942-08-01), Wallgren
patent: 3075781 (1963-01-01), Atkinson et al.
patent: 3096835 (1963-07-01), Neilson
patent: 3489421 (1970-01-01), Neilson
patent: 3680873 (1972-08-01), Garner
patent: 4428588 (1984-01-01), Oelke
Smith International Inc.
Upton Robert G.
Ward Robert S.
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