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PEEK Pump Vanes


PEEK Pump Vanes

Vacuum pumps provide braking assistance (through a brake booster) and support the supercharging and exhaust gas recirculation. They contribute to the overall safety and efficiency of the braking system by reducing the amount of pedal effort required for braking. Since any failures or deterioration in the performance of a vacuum pump would have an adverse effect on the braking performance of an automobile and may even lead to accidents, auto makers have established stringent requirements for the reliability and performance of vacuum pumps prior to assembly. The vane type pumps supply brake boosters with negative pressure of 0.9 bar (1,880 lbs/sq ft) to reduce braking efforts for drivers.

In order to keep the pump vanes working efficiently, they require high wear resistance in the tip area, low coefficient of friction particularly for electrical pumps, tight dimensional tolerances, thermal expansion similar to or slightly greater than aluminum, and a high strength/weight ratio. In addition, driven by pedestrian safety legislation, the position of the pumps has moved nearer the oil sump, meaning that they experience increasing service temperatures up from 100 to 110°C and 120°C to 130°C (212 to 230°F and 248 to 266°F).

Selection of materials is critical to the performance and operating reliability of vacuum pumps. PEEK polymer has excellent resistance to automotive fluids and has demonstrated a very good compressive creep resistance at elevated temperatures. It is a unique material which maintains high mechanical strength at 150°C (302°F) for 5,000 hours or more and resists brittleness when stressed by mechanical and frictional loads. It withstands the forces generated during cold starting [-40°C (40°F)]) where the engine oil has a relative high viscosity. The material's excellent wear resistance results in a longer service life.

In recent years, the automotive industry has faced increasing pressure to maximize performance and safety while minimizing fuel consumption, weight and cost. As a result, high durability, low cost, driving comfort, and low environmental pollution have become the core measurements of R&D efforts. HONY Plastics 's materials and deep technical support are helping automotive part makers around the world boost product performance, improve design flexibility, and extend service part life while successfully meeting the industry's demanding material requirements.

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