Germany INTERPRECISE seals INTERPRECISE model INTERPRECISE price

INTERPRECISE seals are typical representatives of oil seals. The term "oil seal" generally refers to skeleton oil seals. The function of an oil seal is generally to isolate components requiring lubrication in transmission parts from the external environment, preventing lubricating oil leakage. The skeleton acts like reinforcing steel in concrete components, providing reinforcement and enabling the oil seal to maintain its shape and tension. According to structural form, they can be divided into single-lip skeleton oil seals and double-lip skeleton oil seals. The secondary lip of a double-lip skeleton oil seal serves a dust-proof function, preventing external dust, impurities, etc., from entering the machine interior. According to skeleton type, they can be divided into internally covered skeleton oil seals, externally exposed skeleton oil seals, and assembled oil seals. According to operating conditions, they can be divided into rotating skeleton oil seals and reciprocating skeleton oil seals. Used for gasoline engine crankshafts, diesel engine crankshafts, gearboxes, differentials, shock absorbers, engines, axles, and other locations.

INTERPRECISE seal construction

The skeleton oil seal structure consists of three parts: the seal body, the reinforcing skeleton, and the self-tightening helical spring. The sealing body is further divided into the bottom, waist, cutting edge, and sealing lip according to different parts. Typically, in the free state, the inner diameter of a skeleton oil seal is smaller than the shaft diameter, meaning it has a certain "interference fit." Therefore, after the oil seal is installed into the seal housing and onto the shaft, the pressure of the oil seal cutting edge and the contraction force of the self-tightening helical spring generate 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.

INTERPRECISE seal usage instructions

1) When gearbox lubricating oil volume is ≤ 7 liters, the addition amount per liter of lubricating oil is 20‐30ml; 2) 7‐15 liters, the addition amount is 15‐20ml per liter of lubricating oil; 3) >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 such that it cannot seal oil, a displacement method can be used for compensation.

INTERPRECISE seal precautions

1) Collect a fixed quantity of oil seals. 2) From collection to assembly, oil seals must be kept clean. 3) Before assembly, perform oil seal inspection. Measure whether the dimensions of all parts of the skeleton oil seal match the shaft and housing dimensions. Before installing the skeleton oil seal, clearly compare the shaft diameter with the oil seal inner diameter; they must match. The internal dimensions of the housing must suit the oil seal outer diameter width. Check whether the skeleton oil seal lip is damaged or deformed, and whether the spring has fallen off or rusted. Prevent the oil seal from being placed flat during transport, 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 internal chamfer, which must not have a slope. The end face machining of the shaft and housing must be smooth. Chamfers must have no damage or burrs. Clean the assembly area. There must be no burrs, sand, iron chips, or other debris at the shaft insertion point (chamfer), as these will cause irregular damage to the oil seal lip. It is recommended to use an r angle for the chamfered part. 5) Regarding operational technique, you can feel with your hand whether it is smooth and truly round. 6) Do not tear open the packaging paper of skeleton oil seals too early before installation to prevent debris from adhering to the oil seal surface and entering into operation. 7) Before machine installation, 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. Assemble as soon as possible. If the oil seal housing with the installed oil seal is not immediately installed in the machine, it is recommended to cover it with a cloth to prevent foreign matter from adhering to the oil seal. Hands or tools applying lithium-based grease must be clean. 8) Skeleton oil seals must be installed flat; tilting is not allowed. It is recommended to use hydraulic equipment or sleeve tools for installation. Pressure should not be too high; speed must be uniform and slow. 9) Mark the machine where the skeleton oil seal is installed for tracking purposes. Pay close attention to the entire process.

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