Spur Gears – Polyketone (PK)(S-Shock) – Module 3

Polyketone (PK), colour: natural. High-performance technopolymer with chemical resistance superior to POM. With a tensile strength of 65 MPa, an elastic modulus of 1,450 MPa and a melting temperature of 220 °C, this material combines good mechanical strength with high chemical and temperature resistance.

High chemical resistance and a strong barrier effect against engine fluids. It features impact toughness 2.5 times higher than POM and thermal stability superior to POM and PBT. High dimensional stability, combined with low hygroscopicity and hydrolysis resistance, ensures consistent performance. The sliding properties and optimised finish eliminate squeaking (stick-slip) in polymer-on-polymer contact. Compared with the other materials, polyketone offers strong chemical resistance, higher impact toughness and better dimensional stability in the presence of moisture, while retaining the same excellent lubrication-free sliding properties that characterise both materials. Technopolymer spur gears can mesh with a steel counterpart, with or without lubrication, maintaining reliable performance while reducing wear and transmission noise. The tooth profile complies with ISO 21771-1.

Injection moulding in polyketone (PK). The process ensures high dimensional repeatability and an optimised, uniform surface finish, with competitive costs compared with machining from solid. The as-moulded finish, together with the intrinsic properties of PK, eliminates squeaking (stick-slip) in polymer-on-polymer couplings. Bore reamed to H10 tolerance directly in production: ready to use. Further machining can be carried out on request.