Evonik has recently developed a PEEK molding compound with high friction performance and high durability. Gears made of PEEK can meet the harsh application environment of internal combustion engines and replace metal gears.

It is understood that there is a component in the internal combustion engine called a mass balancer, which ensures the smooth operation of the internal combustion engine by reducing the vibration caused by the piston on the surrounding structure. The mass balancer gear is often in contact with the engine oil and exposed to high temperatures of up to 130 degrees Celsius, and is usually made of metal.

PEEK is now used to manufacture low-wear outer ring gears for plastic gears in mass balancers. This series of components is used by Mercedes-Benz in various vehicle models.

VESTAKEEP PEEK can be used to manufacture low-wear external ring gears for plastic gears in mass balancers. (Image from Evonik)

It is reported that VESTAKEEP PEEK 5000G is a wear-resistant, high-performance material. Plastic gears made of it have lower friction losses and are very quiet during operation compared to metal gears. These plastic gears can also save energy due to their light weight, and can be manufactured cost-effectively through injection molding, avoiding the need for major rework and adjustment when using metal.

Evonik has been working closely with customers to develop the material using its own gear testing platform. “We can generate specific material data that can be used to optimize the design of gears made of high-performance PEEK. We can also test in a temperature range of 20 to 260 degrees Celsius, both under dry and lubricated conditions.”