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Oil Seals and Grease Seals Information

Oil Seals and Grease Seals information

Oil seals and grease seals have a flexible lip that rubs against a shaft or housing to prevent the leakage or ingress of fluids and dirt.

For proper installation, the seal lip should point towards the medium being contained. Some oil seals and grease seals have a spring to help keep the lip in contact with the shaft.

Oil and grease seals are used to retain or separate lubricants or fluids. These seals are primarily used for rotary applications only.

Types of Oil Seals and Grease Seals

The seal type for oil seals and grease seals can be oil seals or other types. An oil seal can also called flexible lip, radial lip, or rotary shaft seal. Common configurations include single lip, double lip, triple lip, and four or more lips.

Bearing Isolators

Oil seals and grease seals information Bearing isolators are dynamic seals designed to protect bearings from outside contaminants. They are comprised of a rotor (rotating) and stator (stationary) member. Some bearing isolators are of labyrinth construction while others use O-rings or other positive seals.

Other types of oil seals and grease seals include:

Single lip oil seals
Double lip oil seals
Metal cased
All rubber or polymer
Internal orientation
External orientation
Axial orientation
Spring-energized

Engine Crankshaft Oil Seal 9031683001

Specifications

Common specifications include sealing orientation, construction parameters, dimensions, service limits, and lip materials.

Sealing Orientation

The sealing orientation and direction is important to consider for oil seals and grease seals.

Rod seals, also referred to as shaft seals, are radial seals. The seal is press-fit into a housing bore with the sealing lip contacting the shaft.
Piston seals are radial seals. The seal is fit onto a shaft with the sealing lip contacting the housing bore. V-rings are considered external lip seals.
A symmetric seal is symmetrical and works equally well as a rod or a piston seal.
An axial seal seals axially against a housing or machine component.