A seal assembly for a shaft supporting a rotary element comprises a sealing ring having an inner radial surface in contact with a seal surface of the shaft. The sealing ring comprising a disc shaped integral radial lip normal to the inner radial surface. A disc shaped seal shield is assembled in sealing contact with a first surface of the integral disc shaped radial lip and also in sealing contact with a first radial surface of an annular seal groove. An energizer positioned in the annular seal groove is in contact with the bottom surface of the groove and a second radial surface of the groove. The energizer exerts a radial force on the outer radial surface of the sealing ring and a lateral force on the integral radial lip of the sealing ring.
1. A seal assembly for a shaft supporting a rotary element, comprising:
a sealing ring having an inner radial surface in contact with a seal gland surface of the shaft, the sealing ring comprising an integral radial lip;
a disc shaped seal shield in sealing contact with a first surface of the integral radial lip and also in sealing contact with a first radial surface of an annular seal groove of the rotary element; and
an energizer in the annular seal groove of the rotary element and in contact with a bottom surface of the seal groove and a radial surface of the seal groove, the energizer exerting a radial force on an outer radial surface of the sealing ring and a lateral force on the integral radial lip of the sealing ring.
2. The seal assembly as set forth in claim 1 wherein the force exerted by the energizer on the outer radial surface of the sealing ring and the integral radial lip minimizes movement between the sealing ring and the annular groove of the rotary element.
3. The seal assembly as set forth in claim 1 wherein the energizer comprises a material resistant to compression set, exhibits a high resilience, and has a high tensile strength.
4. A seal assembly as set forth in claim 1 wherein the sealing ring comprises a material having surface properties of lubricity, resistance to chemical attack, resistance to thermal degradation, and resistance to abrasive wear.
5. The seal assembly as set forth in claim 1 wherein the energizer comprises a hydrogenated nitrile rubber.
6. The seal assembly as set forth in claim 1 wherein the sealing ring comprises a PTFE compound reinforced with fibers for abrasive wear resistance.
7. A seal assembly for a shaft supporting a rotary element, comprising:
a sealing ring having an inner radial surface in contact with a seal gland surface of the shaft, the sealing ring comprising an integral disc-shaped radial lip;
a disc shaped seal shield in sealing contact with a first surface of the integral disc-shaped radial lip and also in sealing contact with a first radial surface of an annular seal groove of the rotary element; and
an energizer in the annular seal groove in contact with the bottom surface of the seal groove and a second radial surface of the seal groove, the second surface axially opposite from the first radial surface, the energizer further in contact with an outer radial surface of the sealing ring and a second surface of the integral disc shaped radial lip of the sealing ring.
8. The seal assembly as set forth in claim 7 wherein the energizer comprises a material resistant to compression set, exhibits a high resilience, and has a high tensile strength.
9. The seal assembly as set forth in claim 8 wherein the material of the energizer comprises a hydrogenated nitrile rubber.
10. The seal assembly as in claim 7 wherein the material of the sealing ring comprises a PTFE compound reinforced with fibers for abrasive wear resistance.
11. The seal assembly as in claim 7 wherein the energizer exerts a radial force on the outer radial surface of the sealing ring and a lateral surface on the second surface of the integral disc-shaped radial lip of the sealing ring.
12. The seal assembly as in claim 11 wherein the force exerted by the energizer on the sealing ring and the disc shaped seal shield minimizes movement between the sealing ring, the seal shield and the first radial surface of the annular groove.
13. A drill bit comprising:
a body having a cutter support pin and defining a sealing surface;
a cutter having cutter cutting structure thereon and defining a sealing surface;
a bearing assembly for rotatably supporting the cutter on the cutter support pin of the body;
a seal assembly comprising;
a sealing ring having an inner radial surface in contact with a seal gland surface of the cutter support pin, the sealing ring comprising an integral radial lip;
an energizer in an annular seal groove and in contact with a bottom surface of the seal groove and a second radial surface of the seal groove, the second radial surface axially opposite from a first radial surface in contact with the sealing ring; and
a disc shaped seal shield in sealing contact with a first surface of the integral radial lip and also in sealing contact with the first radial surface of the annular seal groove.
14. The drill bit as set forth in claim 13 wherein the energizer comprises a material resistant to compression set, exhibits a high resilience, and has a high tensile strength.
15. The drill bit as set forth in claim 13 wherein the sealing ring comprises a material having surface properties of: lubricity, resistance to chemical attack, resistance to thermal degradation, and resistance to abrasive wear.
16. A drill bit comprising:
a body having a cutter support pin and defining a sealing surface;
a cutter having cutting structure thereon and defining a sealing surface;
a bearing assembly for rotatably supporting the cutter on the cutter support pin of the body; and
a seal assembly comprising:
a sealing ring having an inner radial surface in contact with a seal surface of the cutter support pin, the sealing ring comprising an integral disc-shaped radial lip;
a disc shaped seal shield in sealing contact with a first surface of the integral disc-shaped radial lip and also in sealing contact with a first radial surface of an annular groove in the sealing surface of the cutter; and
an energizer assembled in the annular seal groove in contact with the bottom surface of the seal groove and a second radial surface of the seal groove, the second radial surface axially opposite from the first radial surface.
17. The drill bit as set forth in claim 16 wherein the energizer exerts a radial force on the outer radial surface of the sealing ring and a lateral force on a second surface of the integral disc-shaped radial lip of the sealing ring.
18. The drill bit as in claim 17 wherein the energizer comprises a material resistant to compression set, exhibits a high resiliency, and has a high tensile strength.
19. The drill bit as set forth in claim 18 wherein the sealing ring comprises a material having surface properties of: lubricity, resistance to chemical attack, resistance to thermal degradation, and resistance to abrasive wear.