[Part I: Skeleton Oil Seal – The Core of Rotary Power] As is widely known, “oil seal” is a broad term whose primary functions are to prevent the leakage of lubricating media and to block external contaminants. The most representative type is the Skeleton Oil Seal, composed of a metal frame, a rubber body, and a self-tensioning spring. Its sealing principle relies on the radial force exerted by the spring and the rubber lip against the shaft to form a precise sealing oil film. Common models, such as TC and SC, are extensively utilized in rotating components like engine crankshafts, gearboxes, and motor shaft ends.
[Part II: Floating Seal – Protection for Extreme Conditions] In high-wear environments such as mining or construction machinery where standard seals may fail, Floating Seals must be employed. This type consists of a pair of wear-resistant alloy rings and two rubber load rings. The sealing principle involves the rubber rings compressing the metal faces to create a precision-fit interface. Due to its “floating” characteristic, which automatically compensates for wear, it maintains exceptional sealing reliability even in harsh, high-vibration conditions involving heavy mud and sand—typical in excavator track rollers and undercarriage travel mechanisms.
[Part III: Hydraulic Seal – The Hub of Reciprocating Motion] For reciprocating linear motion, Hydraulic Seals are essential. Unlike the previous two types, these are primarily used within hydraulic cylinders and include components such as piston seals, rod seals, and wipers. Typically manufactured from high-modulus polyurethane or composite materials, they are designed to precisely control internal and external leakage through the interference fit of the sealing lips under high-pressure pulsation. They serve as critical pressure-retaining elements in hydraulic struts, injection molding machines, and various precision hydraulic systems.
Post time: Mar-27-2026