Seal assembly for drill bit

1. A drill bit comprising

a floating journal bushing;

a seal;

a cutter comprising a seal gland for the seal and a cutter bearing surface proximate to the floating journal bushing, wherein the cutter bearing surface comprises a first cutter inner diameter, wherein the cutter bearing surface further comprises a cutter bearing surface extension, the cutter bearing surface extension comprises a lip positioned proximate to the seal gland, and wherein the seal comprises a seal cross section width and wherein a length of the cutter bearing surface extension is in a range from about 1% to about 50% of the seal cross section width;

a journal, wherein the cutter is rotatably coupled about the journal, wherein the floating journal bushing is rotatably coupled about the journal, wherein the journal comprises a seal boss having a first journal outer diameter, and a journal bearing surface having a second journal outer diameter, and wherein the first journal outer diameter is less than the first inner diameter; and

a bushing flange positioned between the journal bearing surface and seal boss, wherein a length of the bushing flange is in a range from about 25% to about 75% of a width of the floating journal bushing.

2. The drill bit of claim 1 , wherein the first journal outer diameter is less than the second journal outer diameter.

3. The drill bit of claim 1 , wherein a length of the bushing flange is in a range from about 0.015 inches to about 0.04 inches.

4. The drill bit of claim 1 , wherein the seal gland comprises a first cavity for the seal and a second cavity within a region of the cutter proximate to the cutter bearing surface.

5. The drill bit of claim 4 , wherein the second cavity provides the cutter bearing surface extension.

6. A drill bit comprising

a journal bearing, wherein the journal bearing is chosen from a non-bushing bearing and a floating journal bushing;

a seal;

a cutter comprising a seal gland for the seal and a cutter bearing surface proximate to the journal bearing, wherein the cutter bearing surface comprises a first cutter inner diameter;

a cutter bearing surface extension positioned adjacent to the cutter bearing surface and proximate to the journal bearing, wherein the cutter bearing surface extension comprises a lip positioned proximate to the seal gland, and the seal comprises a seal cross section width and wherein a length of the cutter bearing surface extension is in a range from about 1% to about 50% of the seal cross section width; and

a journal, wherein the cutter is rotatably coupled about the journal and wherein the journal bearing is rotatably coupled about the journal, wherein the journal comprises a seal boss having a first journal outer diameter, and a journal bearing surface having a second journal outer diameter, wherein the first journal outer diameter is less than the first cutter inner diameter.

7. The drill bit of claim 6 , wherein the seal gland comprises a first cavity for the seal and a second cavity within a region of the cutter proximate to the cutter bearing surface.

8. The drill bit of claim 7 , wherein the second cavity provides the cutter bearing surface extension.

9. The drill bit of claim 6 ,

wherein the journal bearing is a floating journal bushing; and

wherein the journal further comprises a bushing flange positioned between the journal bearing surface and seal boss.

10. The drill bit of claim 9 , wherein the first journal outer diameter is less than the second journal outer diameter.

11. The drill bit of claim 9 , wherein a length of the bushing flange is in a range from about 25% to about 75% of a width of the floating journal bushing.