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Metalwork 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 in transmission systems, and the term also refers to general liquids). They isolate lubricated parts in the transmission from 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 covered by rubber. The term "oil seal" generally refers to this type of tc skeleton oil seal.

Metalwork seal construction

The skeleton oil seal structure consists of three parts: the seal body, the reinforcing skeleton, and the self-tightening helical spring. The seal body is divided into the bottom, waist, cutting edge, and sealing lip according to different parts. Typically, in the free state, the inner diameter of the skeleton oil seal is smaller than the shaft diameter, meaning it has a certain "interference fit." Therefore, after the oil seal is installed in the seal housing and on the shaft, the pressure from the oil seal cutting edge and the contraction force of the self-tightening helical spring exert a certain radial tightening force on the shaft. After a period of operation, this pressure will rapidly decrease or even disappear; thus, the spring can compensate for the oil seal's self-tightening force at any time.

Metalwork seal usage guidelines

1) When the gearbox lubricating oil volume is ≤7 liters, the addition amount per liter of lubricating oil is 20‐30ml; 2) When 7‐15 liters, the addition amount is 15‐20ml per liter of lubricating oil; 3) When >15 liters, the addition amount is 10ml per liter of lubricating oil; 4) Oil seals not in temporary use should be stored properly to prevent contamination with oil stains, dust, or exposure to sunlight. 5) When the shaft diameter wears into a "V" shaped groove, causing the contact pressure between the new oil seal lip and the shaft to drop so that it cannot seal oil, the displacement method can be used to compensate.

Metalwork seal installation precautions

1) During installation, pay close attention to avoiding installation deviations. Tighten the pressure cover after aligning the coupling. Bolts should be tightened evenly to prevent tilting of the pressure cover end face. Check each point 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 each point with a feeler gauge; the permissible error must not exceed 0.01 mm. 2) The spring compression amount must be performed according to regulations. Excessive or insufficient compression is not allowed. The required error is 2.00 mm. Excessive compression increases the specific end-face pressure, accelerating end-face wear. Insufficient compression results in inadequate specific pressure, failing to achieve a seal. 3) After installing the rotating ring, press it against the spring; it should automatically spring back. 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 time, check for abnormalities such as scratches or damage on the sealing friction pair surfaces and sealing rings. Also, check for scratches on the shaft or shaft sleeve surfaces and flanges that contact packing, sealing rings (O rings), etc. If any abnormalities are found, replace or repair them before use. During actual installation, do not bring more parts than needed to the site. If there are leftover parts 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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