Germany HWS seals HWS model HWS price

HWS seals are devices that prevent fluid leakage, consisting of at least one pair of faces perpendicular to the rotation axis that remain in contact and slide relative to each other under the action of fluid pressure and the elastic force (or magnetic force) of the compensation mechanism, along with auxiliary seals. Mechanical seals where the elastic loading mechanism and auxiliary seal are metal bellows are called metal bellows seals. In light-duty seals, rubber bellows are also used as auxiliary seals; since the elastic force of rubber bellows is limited, springs are generally required to supplement the loading force. Mechanical seals are commonly referred to as "mech seals".

HWS seal principle

Since there is an 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 interface with air, preventing leakage of the working medium and thereby achieving sealing of the rotating shaft. The sealing capability of the 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 skeleton oil seal is perpendicular to the shaft centerline; 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 the housing to achieve the formation of an oil film at the sealing surface.

HWS seal function

The function of a skeleton oil seal is generally 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 rotating shaft lip seal. The skeleton acts like reinforcement bars in concrete components, providing strengthening and allowing the oil seal to maintain its shape and tension. Based on the skeleton type, they can be classified into inner skeleton oil seals, outer skeleton oil seals, and exposed inner/outer 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, and other parts. 1) Prevent sand, dust, water vapor, etc., from entering 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, high-strength, resistant to media (oil or water, etc.), and have a long service life.

HWS seal installation precautions

1) During installation, pay close attention to avoid installation deviations. Tightening the pressure cover should be performed after coupling alignment. 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 mating 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; the allowable error must not exceed 0.01 mm. 2) Spring compression must be carried out according to regulations; excessive or insufficient compression is not allowed. The required error is 2.00 mm. Excessive compression increases the specific pressure on the face, accelerating 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) Installation position requirements: To ensure stable operation, long service life, and low leakage performance of the mechanical seal, correct installation on the machine is crucial. When installing the mechanical seal on the machine, compare it carefully with the general assembly drawing before installation to confirm that all parts are ready. At this stage, 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 and flanges that come into contact with packing and sealing rings (O rings). 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 there are leftover parts after installation, it indicates missing components during installation; if parts are insufficient, it means unnecessary parts were assembled, serving as a self-check during installation.

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