- The primary function of these seals is to create an airtight barrier between the moving parts and the surrounding environment. In high-pressure scenarios, the integrity of the seal is paramount. A leak could lead to loss of lubrication, causing excessive wear and tear on machinery, or even catastrophic failure. Conversely, if contaminants ingress, they can damage sensitive components, reducing efficiency and lifespan.
Oil seals are typically classified based on their sealing capabilities, with common types including lip seals, mechanical seals, and hydraulic seals. Lip seals are the most basic type, consisting of a flexible lip that seals against the shaft. Mechanical seals use sliding or rotating components to create a seal, while hydraulic seals are designed for high-pressure applications.

crankshaft oil seal.
Rubber covered
Silicone
Wide temperature range
Commonly used in low temperature applications
Very prone to mechanical damage during fitting
(1) Shaft speed Due to design and structural reasons, high-speed shafts should use high-speed oil seals, low-speed shafts should use low-speed oil seals, and low-speed oil seals cannot be used on high-speed shafts, and vice versa.
Material Code ISO 1629


Lubricant can be retained in the space between the main lip and the minor lip.
Most oil seals consist of some basic elements that configure their structure, such as the sealing element, the metal case, and the spring: