German NILOS RING seals, NILOS RING models, NILOS RING prices

NILOS RING seals are typical representatives of oil seals; the term 'oil seal' generally refers to skeleton oil seals. The function of an oil seal is generally to isolate components requiring lubrication in transmission parts from the external environment, preventing lubricating oil leakage. The skeleton acts like reinforcing steel in concrete components, providing reinforcement and enabling the oil seal to maintain its shape and tension. According to structural form, they can be divided into single-lip skeleton oil seals and double-lip skeleton oil seals. The secondary lip of a double-lip skeleton oil seal serves a dust-proof function, preventing external dust, impurities, etc., from entering the machine interior. According to skeleton type, they can be divided into internally covered skeleton oil seals, externally exposed skeleton oil seals, and assembled oil seals. According to operating conditions, they can be divided into rotating skeleton oil seals and reciprocating skeleton oil seals. Used for gasoline engine crankshafts, diesel engine crankshafts, gearboxes, differentials, shock absorbers, engines, axles, and other parts.

NILOS RING seal types

1) Compression seals: Compression seals, especially O rings, have been widely used in sealing applications. Other forms such as X type, T type, D type, square, triangular, etc., are suitable for application in different occasions. The direction of improvement is to make their sealing performance stable and reliable, improve their pressure resistance, and reduce friction. They can also form combined seals with low-friction plastics such as PTFE and nylon slide rings and support rings. This improves pressure resistance and reduces friction. Some manufacturers' products are permitted to reach speeds of 7.5m/s and sealing pressures of 5.6MPa. 2) Reciprocating lip seals: Reciprocating lip seals, also known as lip gaskets or cups, are widely used for dynamic sealing in reciprocating hydraulic cylinders. The pressure-bearing surface of this seal is lip-shaped; during installation, there is a minimal interference fit, allowing the lip edge to fully contact the sealing surface to create a seal. When the cylinder operates, as pressure increases, the contact force and contact area increase, thereby improving sealing. During the cylinder return stroke, pressure decreases, and both contact area and friction are lower than during the working stroke, creating a breathing effect that lubricates the lip. There are many types of reciprocating seals; common ones include J type, L type, U type, V type, and Y type. There are also various combination and composite seals, such as bellows-type, bud-type, and multi-lip seals. Extrusion must be prevented under high pressure by selecting materials with sufficient tear strength, hardness, and modulus, or by using support rings for protection, or by employing reinforced elastomers. Seals used under high pressure, high speed, or high temperature often use composite combination seals. Their common feature is having two lips in contact with the cylinder wall. A groove is provided in the middle of the sealing area to store medium, improving lubricity, reducing lip wear, and ensuring reliable sealing. Lip seals used in pneumatic systems are required to operate without oil lubrication; contact pressure varies, and some integrate dust wipers with the seal structure. 3) Rotating shaft lip seals: There are no fewer than 200 varieties of similar structures. Examples include hydrodynamic type, internally covered skeleton, assembled type, externally exposed skeleton, bonded PTFE AF type, dual-modulus return-flow type, etc. The advantage of the externally exposed assembled type is accurate positioning, high concentricity, and good heat dissipation conditions. It remains stable under pressure and vibration, resulting in a longer service life while saving rubber material. The dual-modulus return-flow type applies wave seal theory; by adding a low-modulus, easily deformable material at the sealing contact point, a return-flow effect is achieved, simultaneously reducing product design and mold processing costs. Flexible sealing treatment should be properly applied at the joints between rigid waterproof layers and gable walls, parapet walls, and structures protruding from the roof.

NILOS RING seal influencing factors

Hydraulic seals play a crucial role in the integrity of hydraulic and pneumatic systems. If the seals of a hydraulic or pneumatic component are substandard, the component itself cannot be considered a good product. Many factors affect seals. First, pressure is a significant factor influencing seal quality; the magnitude of pressure and the duration of pressure cycles greatly impact seal damage (such as extrusion). The higher the pressure, the greater the influence of other factors on seal performance, such as temperature, speed, seal material, clearance between piston and cylinder barrel, and clearance between piston and cylinder head. Another factor is temperature and friction. It is difficult to describe the maximum and minimum operating temperatures for a seal material because this is the result of the combined influence of a series of factors. Operating temperatures for pistons and piston rods differ, so they must be selected accordingly. Another factor is the surface roughness of the seal product; surface characteristics, pressure, medium, temperature, seal material, seal type, and motion speed are all factors affecting seals. The last factor is surface treatment. Experience shows that the surface characteristics of cylinder pistons and piston rods have a significant impact on seal life. Surface characteristics are commonly defined by the RA value of surface roughness; RA is the arithmetic mean of the absolute values of surface profile deviations from the centerline. However, these values do not fully represent the impact of surface conditions on seals, because even at the same roughness, different surface shape characteristics can lead to varying degrees of seal wear.

NILOS RING seal specifications and applications

1) Standard single-lip: Generally used for sealing mineral oil, water, and other media in high- and low-speed rotating shafts and reciprocating motions. Standard oil seals are used in environments with less dust and impurities, resistant to media pressure<0.05MPa, maximum linear speed 15m/s, reciprocating motion speed<0.1m/s. 2) Standard double-lip: In addition to the usage characteristics of the aforementioned S type oil seals, they also provide dust protection. Standard oil seals with a dust lip can prevent dust ingress and are resistant to media pressure<0.05MPa, linear speed ≤15m/s. 3) Springless type: Springless single-lip internally covered skeleton rubber oil seal. Generally suitable for low-speed conditions where the sealing medium is lubricating grease. Linear speed ≤6m/s. 4) External skeleton single-lip: Single-lip externally exposed skeleton rubber oil seal with spring, featuring a thin waist, good followability, and good rigidity. Standard oil seals are used in environments with less dust and impurities, resistant to media pressure<0.05MPa. For cases where rotating shaft linear speed ≤15m/s. 5) External skeleton double-lip: Double-lip externally exposed skeleton rubber oil seal with secondary lip, featuring a thin waist, good followability, high rigidity, and good concentricity. Standard oil seals with a dust lip can prevent dust ingress and are resistant to media pressure<0.05MPa. Rotational speed ≤15m/s. 6) Assembled single-lip: Externally exposed skeleton oil seal formed by assembling inner and outer skeletons with rolled edges, featuring high installation precision, fast heat dissipation, and heavy-load characteristics. Suitable for heavy-load conditions under high temperature and high speed, media pressure ≤0.05MPa, maximum linear speed ≤15m/s. 7) Unidirectional return-flow type (right-hand, left-hand): Angled ribs are manufactured on the air side of the lip, utilizing fluid dynamics principles to generate a unidirectional pumping action with a return-flow effect. Related to the shaft's rotation direction, the radial force is smaller than that of standard oil seals due to the return-flow effect, reducing wear and heat generation, and extending service life. Suitable for media pressure<0.05MPa, rotational speed ≤20m/s. 8) Pressure-resistant type: Short lip and short, thick waist, providing pressure resistance, working pressure ≤3MPa. Suitable for applications with media pressure ≤3MPa, suitable for shaft end oil seals in high-pressure pumps. Generally, the PV value ≤8. Rotating shaft linear speed ≤15m/s.

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