Low Friction = Reduced Torque Loss

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Maryann Summers
5 years ago
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1 1 Low Friction = Reduced Torque Loss = Improved Vehicle Efficiency

2 Added Benefit from DuPont TM Vespel SP-2515: 2 The low coefficient of friction of Vespel SP-2515 can help designers improve component efficiency o C 23 o C Coefficient of friction Coefficient of Friction % Reduction 45% Reduction Mating material Sample ring Test equipment Thrust load ATF D-Ⅲ 0 Vespel SP PEEK Vespel Vespel SP PEEK SP-2515 SP-2515 Test conditions Thrust load: 0.4 MPa, Sliding speed: 1.67 m/sec Lubricant: ATF D-III Mating material: cold rolled steel; roughness (Rmax): 3.2μm; hardness: 105HV50 Revolution

Low friction materials improve efficiency by reducing torque loss (simulated transmission shaft and housing test, lubricated) Seal rings made of DuPont TM Vespel SP-2515 can reduce frictional torque

3 Low friction materials improve efficiency by reducing torque loss (simulated transmission shaft and housing test, lubricated) Seal rings made of DuPont TM Vespel SP-2515 can reduce frictional torque loss by 50% compared with PEEK seal rings. Frictional Torque Loss (N-m/ring) Competitive PEEK seal ring 50% Reduction DuPont TM Vespel seal ring using SP-2515 and proprietary oil groove design Seal Ring Tester Housing : Rotation (w/torque monitor) Seal rings Oil leakage Groove Surface Temperature ( o C) Test conditions: Oil Pressure: 1 MPa Speed: 6000 rpm Lubricant: ATF D-III Ring Dia.: 59 mm Mating material: carbon steel (AISI SAE:1045 or JIS: S45C) Housing & shaft roughness (Rmax): 3.2 μm Hardness: 250HV50 3 Oil in Oil out

4 DuPont TM Vespel SP-2515 can help remove heat from critical operating areas (bearing surfaces) Thrust washer test results Coefficient of Friction 0.16 0.14 0.12 0.1 0.08 0.06 0.04 0.02 0.

4 4 DuPont TM Vespel SP-2515 can help remove heat from critical operating areas (bearing surfaces) Thrust washer test results Coefficient of Friction * 195* 195* Coefficient of Friction Surface Temperature *safety interlock at 195 C > 30% lower surface temperatures Surface Temperature ( o C) Vespel SP-2515 has low coefficient of friction Vespel SP-2515 has high thermal conductivity Allows cooler running bearing surfaces 0 Bronze Mating Material: 4140 steel; 0.2Ra 0 P: 2MPa V: 11.5 m/s Oil: ATFD-VI PV: 23 MPa m/s Time: 60 min PEEK PEEK PAI low PAI+ Vespel Vespel Oil start temp: 90 C at 500 cc/min CF+PTFE 30%CF wear graphite SP-21 SP Graphite DuPont TM Vespel grade - delivering +PTFE big science part by part. Faster than ever before

5 5 Applications, Solutions and Opportunities Getting the Heat Out

6 6 DuPont TM Vespel SP-2515: High Thermal Conductivity Vespel SP-2515 offers high thermal conductivity which can help remove heat from critical bearing surfaces. Thermal Conductivity vs Common Bearing Materials Air Oil Plastics SP-21 SP-22 SP-2515 Stainless Bronze Carbon Steel Cast Iron Aluminum > 4 X Higher Conductivity Thermal Conductivity - Log Scale (W/(m-K)) Unique composition exhibits high thermal conductivity compared to other polymers Allows for: Cooler running surfaces and parts Higher Pressure x Velocity (PV) limits.

7 7 DuPont TM Vespel SP-2515 can help remove heat from critical operating areas (bearing surfaces) Getting the Heat Out Relative Heat In or Out (Joules) Oil SP-21 SP-22 SP X higher vs oil Temperature Differential (K) Heat transfer (J) = k(w/(m-k)) x A(m 2 ) x T(K) x t(s) / X(m) > 4 X higher vs SP-21 Vespel SP-2515 has > 4X more heat conductivity than Vespel SP-21 May help provide cooler running bearing surfaces

8 8 Opportunities for Innovation Lower friction materials can result in: Improved component efficiency (improved mileage, lower emissions) Faster and more consistent response time & reduced actuation force Where else can you put low friction materials and DuPont Vespel solutions to work for you? Talk to us About Fuel efficiency / emissions Performance New propulsion (hybrids) Increasing use of electronic controls For Variable valve timing & lift EGR technologies Turbochargers New transmission designs (6,7,8 speed; CVT; dual clutch; electric/hybrid) Actuators, DC drives, stability control systems, electric pumps (fuel, oil, etc.)

9 9 Delivering big science, part by part. Faster than ever before...

Science of Friction. DuPont Market Driven Innovation: Volker Plehn. Director Development & Sales. DuPont Kalrez & Vespel

Science of Friction. DuPont Market Driven Innovation: Volker Plehn. Director Development & Sales. DuPont Kalrez & Vespel DuPont Market Driven Innovation: Science of Friction Volker Plehn Director Development & Sales DuPont Kalrez & Vespel Science of Friction Increased Importance of Friction Friction from a Polymer Point