Trelleborg Sealing Solutions Germany Gmbh

Jean-Jacques Adolf

Holger Jordan

Joerg Peter

In a U-cup based seal of a rod, the basic body of the U-cupis recessed relative to a square cross-sectional shape in the region of a radially inner outer edgeon the low pressure side in order to obtain a spacebetween the U-cupand the opening, i.e. the passage openingof a sealing gapleading into a rectangular grooveguiding the U-cup. This spaceremains at least partially also upon pressurization such that the U-cupcomplete remains in the grooveupon pressurization and is not extruded into the sealing gapThis considerably reduces wear of the U-cup. An inner surfaceof the U-cup shows liquid dragging bore reliefs formed as recessesin the inner surfaceof the U-cupfor transferring hydraulic liquid, disposed on a surface of the translatory movable machine part, from a low-pressure sideof the U-cup to a high-pressure side H of the U-cupupon translatory movement of the movable machine part. The recesseseach extend in an axial direction from the low pressure side N of the U-cup towards the inner sealing lipand each recess is radially confined by side wallswhich converge in the direction of the inner sealing lip such as to form an imaginary intersection located beyond the inner sealing lipon the high-pressure side of the U-cup

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Cessy, France

Jean-Jacques Adolf