German Pirelli seals Pirelli model Pirelli price

Pirelli seals can be divided into two main categories: static seals and dynamic seals. Static seals mainly include three types: gasket seals, sealant seals, and direct contact seals. According to working pressure, static seals can be further divided into medium-to-low pressure static seals and high-pressure static seals. Medium-to-low pressure static seals commonly use gasket seals made of softer materials with wider widths, while high-pressure static seals use metal gaskets made of harder materials with very narrow contact widths. Dynamic seals can be divided into two basic types: rotary seals and reciprocating seals. Others are classified as contact seals and non-contact seals based on whether the seal contacts the components moving relative to it; based on the seal and contact position, they can be divided into circumferential seals and face seals, with face seals also known as mechanical seals. Centrifugal seals and spiral seals in dynamic sealing achieve sealing by imparting energy to the medium during machine operation, hence they are sometimes referred to as hydrodynamic seals.

Pirelli seal principle

Due to the oil film controlled by the oil seal lip between the oil seal and the shaft, this oil film has fluid lubrication characteristics. Under the action of liquid surface tension, the stiffness of the oil film causes the end of the oil film in contact with air to form a meniscus, preventing leakage of the working medium and thereby achieving sealing of the rotating shaft. The sealing capability of an oil seal depends on the thickness of the oil film on the sealing surface; if the thickness is too great, the oil seal will leak; if the thickness is too small, dry friction may occur, causing wear on the oil seal and shaft; if there is no oil film between the sealing lip and the shaft, it is prone to heating and wear. Therefore, during installation, some oil must be applied to the sealing ring, and it must be ensured that the skeleton oil seal is perpendicular to the shaft axis; if not perpendicular, the sealing lip of the oil seal will wipe the lubricating oil off the shaft, leading to excessive wear of the sealing lip. During operation, it is ideal for a slight amount of lubricant to seep out from within the housing to achieve the formation of an oil film at the sealing surface.

Pirelli seal function

The general function of a skeleton oil seal is to isolate components requiring lubrication in transmission parts from output components, preventing lubricating oil leakage. It is typically used on rotating shafts and is a type of rotary shaft lip seal. The skeleton acts like reinforcement bars in concrete components, providing strengthening and enabling the oil seal to maintain its shape and tension. Based on the skeleton type, it can be divided into inner skeleton oil seals, outer skeleton oil seals, and exposed inner/outer skeleton oil seals. Skeleton oil seals are made of high-quality nitrile rubber and steel plates, offering stable quality and long service life. They are widely used in automobiles, motorcycles, crankshafts, camshafts, differentials, shock absorbers, engines, axles, front and rear wheels, and other locations. 1) Prevent sand, dust, water vapor, etc., from entering the bearing from the outside; 2) Restrict lubricating oil in the bearing from leaking out. Requirements for oil seals include dimensions (inner diameter, outer diameter, and thickness) complying with regulations; appropriate elasticity to properly grip the shaft and provide sealing; heat resistance, wear resistance, good strength, resistance to media (oil or water, etc.), and long service life.

Pirelli seal precautions

1) Obtain a fixed quantity of oil seals. 2) From receipt to assembly, the oil seals must be kept clean. 3) Before assembly, inspect the oil seals, measure whether the dimensions of each part of the skeleton oil seal match the shaft and housing dimensions. Before installing the skeleton oil seal, clearly compare the shaft diameter with the inner diameter of the oil seal to ensure they match. The internal dimensions of the housing must be suitable for the outer diameter width of the oil seal. Check whether the lip of the skeleton oil seal is damaged or deformed, and whether the spring has fallen off or rusted. Prevent the oil seal from being placed flat during transportation, which could affect its roundness due to external squeezing and impact. 4) Perform machining inspection procedures before assembly, measure whether the dimensions of the housing and shaft parts are correct, especially the inner chamfer, which must not have a slope. The end faces of the shaft and housing must be machined smoothly, with no damage or burrs on the chamfers. Clean the assembly area; there must be no burrs, sand, iron chips, or other debris at the shaft insertion area (chamfer), as these can cause irregular damage to the oil seal lip. It is recommended to use a r angle for the chamfer area. 5) Regarding operational technique, use your hand to feel whether it is smooth and truly round. 6) Do not tear open the packaging paper of the skeleton oil seal too early before installation to prevent debris from adhering to the seal surface and entering into operation. 7) Before mounting, apply an appropriate amount of lithium-based grease containing molybdenum disulfide between the lips of the skeleton oil seal to prevent dry grinding of the lip during instantaneous shaft startup, which affects the lip interference fit, and assemble as soon as possible. If the oil seal housing with the installed seal is not mounted immediately, it is recommended to cover it with a cloth to prevent foreign matter from adhering to the seal. Hands or tools applying the lithium-based grease must be clean. 8) The skeleton oil seal must be installed flat, without tilting. It is recommended to use hydraulic equipment or sleeve tools for installation. The pressure should not be too high, and the speed should be uniform and slow. 9) Mark the machine where the skeleton oil seal is installed for tracking purposes, and pay close attention to the entire process.

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