One of the main principles of power transmission is consistent lubrication. Shaft seals play a hugely important role in this. Imagine a situation involving a shaft-mount reducer – electric motor prime mover, driven by belts, motion controlled by a torque arm – with an improperly seated seal. A blown-out input shaft seal is a nightmare situation, necessitating an entire breakdown and reassembly, not to mention re-aligning and re-tensioning the belts.
The spring shown in the figure is known as a garter spring, and it maintains tension on the sealing lip of the seal. Garter springs are closed coil springs used in the form of a ring, the ends of which are connected together as shown in Figure 2.10.

steering oil seal.
NBR
Spring
Since oil seals are versatile and multipurpose, they are suitable for all types of mechanical engineering situations, e.g., manufacturing units, automobiles, pumps, etc.
HID (High Intensity Discharge)


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Lubricant can be retained in the space between the main lip and the minor lip.

For more detailed information, please see the following:
Price of Oil Seals: Factors and Considerations
They are typically made from elastomers such as rubber or silicone and consist of an outer metal case with a sealing lip on the inner side.
Double metal cased