Germany OTT-JAKOB seals OTT-JAKOB models OTT-JAKOB prices

OTT-JAKOB seals are the customary term for general seals; simply put, they are seals for lubricating oil. They are mechanical components used to seal grease (oil is the most common liquid substance in transmission systems, and also refers to general liquid substances), isolating the parts requiring lubrication in the transmission assembly from the output parts to prevent lubricating oil leakage. Seals used for static sealing and dynamic sealing (generally reciprocating motion) are called oil seals. The representative form of oil seal is the TC oil seal, which is a double-lip oil seal with a self-tightening spring fully encapsulated in rubber; the term oil seal generally refers to this type of tc cased oil seal.

OTT-JAKOB 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 it to form a meniscus at the contact end with air, 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 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 cased 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 state of forming an oil film at the sealing surface.

OTT-JAKOB seal function

The function of a cased oil seal is generally to isolate the parts requiring lubrication in the transmission assembly from the output parts, preventing lubricating oil leakage; it is typically used on rotating shafts and is a type of rotating shaft lip seal. The case acts like reinforcement bars in concrete components, providing strengthening and allowing the oil seal to maintain its shape and tension. According to the case type, it can be divided into inner-case oil seals, outer-case oil seals, and exposed inner/outer case oil seals. Cased 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, motorcycle crankshafts, camshafts, differentials, shock absorbers, engines, axles, front and rear wheels, and other locations. 1) Prevent sand, dust, water vapor, etc., from invading the bearing from the outside; 2) Restrict the leakage of lubricating oil from the bearing. Requirements for oil seals include that dimensions (inner diameter, outer diameter, and thickness) must comply with regulations; appropriate elasticity is required to properly grip the shaft and achieve sealing; they must be heat-resistant, wear-resistant, have good strength, be resistant to media (oil or water, etc.), and have a long service life.

OTT-JAKOB seal installation precautions

1) During installation, pay close attention to avoiding installation deviations generated during the process. Tightening the pressure cover should be performed after coupling alignment; bolts should be tightened evenly to prevent skewing of the pressure cover end face. Check each point 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 each point with a feeler gauge; the permissible error must not exceed 0.01 mm. 2) Spring compression must be carried out according to regulations; excessive or insufficient compression is not allowed, with a required error of 2.00 mm. Excessive compression increases specific end-face pressure, accelerating end-face wear. Insufficient compression results in inadequate specific pressure, failing to achieve sealing. 3) After installing the moving ring, pressing it against the spring should allow it to spring back automatically. 4) Positional requirements during installation: To ensure stable operation, long life, and low leakage performance of the mechanical seal, correct installation on the machine is crucial. When installing the mechanical seal onto the machine, compare it carefully with the general assembly drawing before installation to confirm that all parts are ready. At this time, check for abnormalities such as scratches or damage on the sealing faces of the friction pair and sealing rings. Also check for scratches on the surfaces of the shaft or shaft sleeve contacting packing, sealing rings (O rings), flanges, and other components. If any abnormalities are found, they must be replaced or repaired before use. During actual installation, do not bring more parts than necessary to the site. Thus, if parts remain after installation, it indicates missing installations; if parts are insufficient, it means unnecessary parts were assembled, serving as a self-check during installation.

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