Oil Seal Housing Recommendation |
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| Oil Seal Housing Recommendation Which type of oil seal, either covered seal or metal O.D. seal, is recommended depends upon the material of housing. The following are our recommendations: Housing material fit for metal cased seals - steel and cast iron. When applied to housing material of high thermal expansion, such as aluminum or other soft alloys, at temperature raising condition, metal cased seals occasionally back out of the bore due to expansion clearness. On the other hand, if we use rubber covered seals instead of metal cased ones, the clearness will vanish because of the higher thermal expansion rate of rubber itself. Bore Chamber To assist in installation of seals, a bore chamfer is necessary. If the bore chamber is improper or not existing, it will distort the seal case and require more assembly force. Surface Roughness Excessively rough bore finishes may allow paths for fluid to leak between seal O.D. and bore. Following is recommended maximum roughness. Shaft Recommendation Four main conditions make the seal and shaft more compatible and assist in providing optimal seal performance. Shaft Hardness Normally seal contact area of the shaft should be Rockwell C 45 minimum. It is and important factor to prevent excessive wear, deformation, scratches or nicks, and to control the roughness or machining surface easily. Shaft Surface Roughness The recommended shaft surface roughness is as follows: Rotating: 10 to 20 µ inch AA (.25 µm to .50 µm AA). Reciprocating: 5 to 10 µ inch AA (.13 µm to .25 µm AA). This is very critical as greatly influence the amount of lip heat, thus this finish not be overlooked. |
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