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Figure 4.11 Rubber cup with no metal backing or coiled spring in position
Both rubber, metal and a combination of both types of seals are used in conjunction with bearings. Te bearing allows movement and supports the shaſt while the seal prevents oil or other liquids from leaking and dirt getting in.
‘O’ rings are one of the simplest forms of plain rubber seals and can either act as a gasket to seal the joint between two pipes or to prevent liquid leaking in or out where a shaſt passes through a housing.
Compound oil seals are made of a rubber cup where the small diameter of the seal touches the shaſt all the way round while the outer diameter of the seal fits snugly into a housing.
Te outer edge of the seal is usually pressed into position in the housing just tight enough to prevent it from moving or rotating with the shaſt. Tis part of the seal is usually kept rigid by a metal backing.