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Gears made from Evonik's PEEK used in automotive mass balancers

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Gears made from Evonik's PEEK used in automotive mass balancers 

Evonik has developed a PEEK molding compound with very good tribological properties and high durability for use in the harsh environment of an internal combustion engine to replace metal gears. The series component is manufactured by IMS Gear SE & Co KGaA and is used by Mercedes-Benz AG in various models.


Mass balancers ensure the smooth running of an internal combustion engine by reducing the vibrations caused by the pistons on surrounding structures. Mass balancer gears come into contact with engine oils and are therefore exposed to maximum temperatures of up to 130 °C. Until now, only metal gears have been used in this environment.


VESTAKEEP PEEK forms the outer low-wear gear rim of the plastic gear used in series production in a mass balancer.

With VESTAKEEP PEEK 5000 G, Evonik offers a suitable material with high resistance and high performance to replace these metal gears. In addition to the required vibration damping, plastic gears offer an additional advantage of high resistance to mechanical and tribological stress.


Compared to conventional metal gears, they have lower friction losses and are significantly quieter. The lower mass moment of inertia saves energy. Gears made of VESTAKEEP PEEK are manufactured cost-efficiently by injection molding and eliminate the extensive reworking that was previously necessary when using metal.


With the use of its own gear testing rig, Evonik supports development activities during close coordination with the customer. "We can generate specific material data that can be used to optimally design the gears made of our high-performance plastics," introduced Philipp Kilian, Head of Tribology Development High Performance Polymers at Evonik, describing the advantages. "We can test in a temperature range from -20 °C to 260 °C, both in dry and lubricated condition."

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