The floating oil seal is a type of mechanical seal developed to adapt to harsh working environments such as coal dust, sand, and moisture. The floating oil seal is a special form of mechanical seal device with dynamic end face sealing functionality. It has a simple structure and is resistant to contaminants, wear, vibration, displacement, swinging, and impacts. It isreliable, has a long service life, is easy to maintain, and provides good sealing performance. Floating oil seals are mainly used in low-speed and heavy-duty applications and have now been widely used in various engineering machinery and mining machinery. Examples include crawler hydraulic cranes, crawler hydraulic excavators, bulldozers, pavers, and other engineering machinery, as well as mining machinery, agricultural machinery, and construction machinery, such as the travel reducers of excavators and crawler cranes, and the load-bearing wheels of tracks.
The floating oil seal typically consists of a sealing system with six parts: a pair of floating seal rings (hereinafter referred to as "floating rings"), two rubber rings, and two floating seats, requiring a total of five sealing points. The floating ring is an axially saddle-shaped, floating end face seal ring made of iron alloy material. The rubber ring is a rubber ring with a circular cross-section and a relatively thick diameter. The floating seat contains an inner conical surface, which holds the rubber ring and the floating ring, maintaining a certain position in space.
The rubber ring is assembled between the back of the floating ring and the floating seat, precisely positioning the floating ring within the floating seat. The rubber ring not only serves as an auxiliary static sealing component but also exerts axial and radial forces on the floating ring. The radial force serves to transmit torque to the floating ring, while the axial force provides the necessary seal compensation force. Due to its large elasticity compensation range, it can maintain the effective fit of the metal ring sealing surface during vibration, displacement, and swinging of the equipment, achieving the floating sealing effect.
The sealing contact surface width of the floating ring is 0.2-0.3 mm, and the internal conical gap facilitates the entry of lubricating oil into the sealing surface. Lubricating oil enters the sealing gap through capillary action, centrifugal action during rotation, and the increased internal pressure due to temperature rise in the sealing chamber, forming a thin oil film that achieves sealing, lubrication, and cooling. It also prevents aging deformation and loss of elasticity of the rubber ring caused by excessive wear and heat of the contact end faces of the two floating rings. When the bright band of the floating ring wears out, the elasticity of the rubber ring can provide a certain degree of automatic compensation.
Floating Oil Seal: Floating Ring
Since the basic structure of cast iron is mainly sorbitic pearlite or fine flake pearlite, it has a relatively loose structure, which can absorb trace amounts of liquid, forming an oil-containing friction surface, improving lubrication conditions. The mechanical properties and wear resistance of cast iron are relatively good because its chemical composition (especially metallographic structure) can be adjusted to meet different performance requirements. Additionally, cast iron has advantages such as low cost, easy manufacturing, and high thermal conductivity, making it a common material for floating rings.
Floating Oil Seal: Rubber Ring
4364917 Bucket Cylinder Seal Kit Fits EX200-5 Excavator
KZT Anti-fouling Seal Fits Excavator
Transmission Seal Kit Fits Excavator
