Basic Theory of Sealing

Oil Seal Structure

• Oil Side
• Air Side
• Shaft
• Fit
• Metal Insert
• Rubber
• Spring
• Main Lip
• Lip Edge
• Dust Lip

Helix Transition

Parallel helix

NF helix

Sealing Theory of Rotating Axis Seal

Sealing Conditions

The peak of the distributed contact stress should be located on the sealing fluid side.

Unique pumping capacity due to shape and material and that due is to the screw shape