EV Tribology in Practice: Fluids, Bearing Currents & Surface Finishing — with Prof. Boris Zhmud скачать в хорошем качестве

EV Tribology in Practice: Fluids, Bearing Currents & Surface Finishing — with Prof. Boris Zhmud

In this TriboNet webinar, Professor Boris Zhmud unpacks the tribology of e-mobility—from high-speed e-motors and instant torque to bearing currents, gearbox scuffing, seal life, and thermal control. He explains why a total system approach (hardware + tolerances + surface finishing + fluids) beats any “silver bullet,” and shares data on mechano-chemical surface finishing that improves scuffing resistance and overall durability. Q&A topics include multi-speed EV transmissions, water-borne lubricants, PTFE replacements, and why cutting transmission losses has a small impact on range (~2–3%)—while bringing big wins in temperature, comfort, and lifetime reliability. 👉 Subscribe to TriboNet for expert content on tribology, contact mechanics, coatings, and lubrication science. Chapters 00:00 Intro & context: why EVs still need tribology 03:13 Moving parts = friction, wear, and noise 08:00 Single-speed is fading: multi-speed EV gearboxes trend 16:13 What fluids are in EVs today? (ATF/DCT/CVT realities) 22:00 Mechano-chemical finishing: roughness, compressive stress, tribofilm priming 28:15 FZG scuffing tests & additive-lean scenarios 35:40 Viscosity trade-offs: low-speed load vs. high-speed efficiency 37:20 Churning, heat, and oil management at high speed 44:30 Fluids, gear accuracy & mounting—interdependent 48:14 Why range gain is only ~2–3%, but durability/NVH gains are major 50:20 “Total system approach”: match hardware & lubricant 57:46 PTFE alternatives, 59:24 scaling tribo-conditioning, 1:05:18 water-borne lubes Key takeaways Total system design beats piecewise optimization—hardware, surfaces, and fluids must be co-engineered. Mechano-chemical finishing provides a “trio of effects”: improved roughness, compressive stress, and tribofilm priming → better scuffing margins, even with leaner additive packs. Many production EVs still use conventional ATF/DCT/CVT factory fills—engineers value proven specifications while “EV-specific” fluids evolve. Bearing currents add failure modes (fluting/pitting); mitigation includes insulation/grounding, hybrid bearings, and film-robust fluids. Transmission loss cuts add ~2–3% range—the real wins are lower temperatures, NVH comfort, and lifetime reliability. Water-borne lubricants offer exceptional cooling and potential super-lubricity but need advances in low-temp viscosity, corrosion control, and compatibility for fill-for-life use. Related reading on TriboNet Friction — Wiki: https://www.tribonet.org/wiki/friction/ Wear — Wiki: https://www.tribonet.org/wiki/wear/ Boundary Lubrication — Wiki: https://www.tribonet.org/wiki/boundar... Stribeck Curve — Wiki: https://www.tribonet.org/wiki/stribec... Lubricants in Electric Vehicles: https://www.tribonet.org/news/green-t... Tribology challenges in EVs (short): https://www.tribonet.org/news/tribolo... STLE e-mobility white paper – highlights: https://www.tribonet.org/news/new-stl... Who is this for? Powertrain engineers, tribologists, and reliability/NVH teams seeking practical, data-driven strategies for e-axles, gearboxes, bearings, seals, and fluids. 👍 Like, 🔔 subscribe, and share with your team. 💬 Drop your duty cycle, max shaft DN, target viscosity window, and surface finish—we’ll suggest test stacks and validation steps. #tribology #EV #gearbox #lubricants #bearings #NVH #Stribeck #waterborne #surfaces #TriboNet SEO keywords Boris Zhmud; EV tribology; electric vehicle gearbox; e-axle lubrication; bearing currents; fluting; mechano-chemical surface finishing; tribo-conditioning; FZG scuffing; multi-speed EV transmissions; water-borne lubricants; PAG-water; copper compatibility; PTFE replacement; thermal management; Stribeck curve; boundary lubrication; NVH; digital twin; total system approach; TriboNet wiki