Freudenberg combines end seal and damping

ERJ staff report (DS)

Weinheim, Germany -- A new development in rubber from Freudenberg removes several steps from the assembly of pneumatic cylinders. The company has combined the static end seal and end-of-stroke dampinginto one unit instead of two to three seals and further damping washers.

Standardised VDMA and ISO pneumatic cylinders with pneumatic end-of-stroke damping generally come with a cylinder cover structure that is relatively difficult to manufacture and comprises between 2 and 3 seals. Additional damping washers are often used as well.

Freudenberg's new development, Damp & Seal damps the piston thrust, statically seals the cylinder cover, and dynamically seals the inner diameter of the damping pin that is connected to the piston. The company has filed a patent on the technology.

Damp & Seal features a buffer that faces the pressure chamber and damps the mechanical thrust of the piston at the end of the stroke, thereby reducing both acoustic emissions and impact loads in the cylinder. The disc-shaped design of Damp & Seal really simplifies the cover, allowing for a smooth and flush finish on the front face.

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Press release from Freudenberg