German JACOB seals JACOB models JACOB prices

JACOB seals are materials or components that prevent fluids or solid particles from leaking between adjacent mating surfaces and prevent external contaminants such as dust and moisture from entering machinery. The recommended storage temperature for seals is below 30 °C to avoid high-temperature aging. Seals can be divided into two main categories: static seals and dynamic seals. Their primary function is to prevent fluids or solid particles from leaking between adjacent mating surfaces and to prevent external contaminants such as dust and moisture from entering machinery. Static sealing refers to the tight closure of sealed chambers or containers, such as seals for letters and testamentary stamps.

JACOB seal operating principle

An oil film controlled by the sealing lip exists between the oil seal and the shaft, providing fluid lubrication characteristics. Under the action of liquid surface tension, the stiffness of the oil film causes it to form a meniscus at the air contact end, preventing leakage of the working medium and thereby achieving rotation shaft sealing. The sealing capability of an oil seal depends on the thickness of the oil film on the sealing surface. If the film is too thick, the oil seal will leak; if too thin, 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, overheating and wear are likely. Therefore, during installation, some oil must be applied to the sealing ring, and the skeleton oil seal must remain perpendicular to the shaft axis. If not perpendicular, the sealing lip will wipe the lubricating oil off the shaft, leading to excessive wear of the sealing lip. During operation, slight seepage of lubricant from the housing is ideal to maintain an oil film on the sealing surface.

JACOB seal functions

The general function of a skeleton oil seal is to isolate lubricated components in transmission systems from output components, preventing lubricating oil leakage. It is typically used on rotating shafts as a rotary shaft lip seal. The skeleton acts like rebar in concrete, providing reinforcement and allowing the oil seal to maintain its shape and tension. Based on skeleton type, they are classified as internal skeleton oil seals, external skeleton oil seals, and exposed internal/external skeleton oil seals. Skeleton oil seals are made from high-quality nitrile rubber and steel plates, offering stable quality and long service life. They are widely used in automobiles and motorcycles on crankshafts, camshafts, differentials, shock absorbers, engines, axles, front and rear wheels, etc. 1) Prevent sand, dust, water vapor, etc., from entering bearings from the outside; 2) Restrict lubricating oil leakage from bearings. Requirements for oil seals include dimensions (inner diameter, outer diameter, and thickness) complying with specifications; appropriate elasticity to grip the shaft for effective sealing; heat resistance, wear resistance, high strength, media resistance (to oil, water, etc.), and long service life.

JACOB seal installation precautions

1) Pay close attention during installation to avoid deviations. Tighten the pressure cover after aligning the coupling. Bolts should be tightened evenly to prevent tilting of the pressure cover face. Check all points with a feeler gauge; the error must not exceed 0.05 mm. Check the fit clearance (i.e., concentricity) between the pressure cover and the outer diameter of the shaft or shaft sleeve. It must be uniform around the circumference; check all points with a feeler gauge, ensuring the tolerance does not exceed 0.01 mm. 2) Compress the spring according to specifications. Excessive or insufficient compression is not allowed; the required error tolerance is 2.00 mm. Excessive compression increases specific face pressure, accelerating face wear. Insufficient compression results in inadequate specific pressure, failing to achieve sealing. 3) After installing the moving ring, it should automatically spring back when pressed against the spring. 4) Installation position requirements: To ensure stable operation, long service life, and low leakage of the mechanical seal, correct installation on the machine is crucial. Before installing the mechanical seal, carefully compare it with the general assembly drawing to confirm all parts are present. Check for abnormalities such as scratches or damage on the sealing faces of the friction pair and sealing rings. Also inspect the shaft or shaft sleeve surfaces and flanges contacting packing and sealing rings (O rings) for damage. If abnormalities are found, replace or repair before use. During actual installation, do not bring unnecessary parts to the site. If parts remain after installation, it indicates missing components; if parts are insufficient, it means unnecessary components were assembled, serving as a self-check during installation.

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