Glossary L

Glossary L

Lead, Shaft:
Spiral grooves on a shaft surface caused by relative axial movement of grinding wheel to shaft.

See Rate, Leakage.

Length, Deflected:
Refers to the working circumferential length (measured on spring centerline) of the garter spring with the seal lip assembled on a normal (designed) shaft diameter.

Length, Lip:
The axial distance between the thinnest part of the flex section and the contact line.

Length, Spring Free:
The total unconfined length of a spring. For a garter spring, it would not include the rib length.

Life, Flex:
The length of time to failure which indicates the relative ability of a material to withstand dynamic bending or flexing under specific test conditions.

Line, Contact:
The line of intersection between the outside and inside lip surfaces of a radial lip seal. In a cross-sectional view, this intersection is illustrated as a point.

Lip, Axial Dirt:
A nonsprung axial lip at the heel of the elastomeric lip that impinges upon a radial flange and is used

Lip, Auxiliary:
See Lip, Secondary Seal.

Lip, Dirt:
See Lip, Secondary Seal.

Lip, Dust:
See Lip, Secondary Seal.

Lip, Molded:
A type of seal lip which requires no trimming to form the contact line.

Lip, Primary:
The normally flexible elastomeric component of a lip seal assembly, which rides against the rotating surface and effects the seal.

Lip, Static:
The section of the helix seal lip incorporating the contact line.

Lip, Secondary:
A short, nonspring-loaded lip, located at the outside seal face of a radial lip seal to prevent ingress of atmospheric contaminants.

Lip, Spring Retaining:
The portion of the primary lip that restricts the axial movement of the extension spring from a predetermined position.

Load, Radial:
The total force (load) acting on the seal lip which tends to maintain contact of the lip on the shaft. It is the sum of the forces developed from seal interference and the garter spring.

See Pressure, Lip Opening.

Lubricant, Mold:
The substance used to coat the surfaces of a mold to prevent the elastomer from adhering to the mold cavity surface during vulcanization.

Lubricant Starvation:
Lack of proper lubrication at the seal interface which may cause premature wear and early failure.

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