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BorgWarner supplying wet friction technology for Volkswagen Group’s DQ 400e dual-clutch transmission for hybrids

Rendering of friction plate. Click to enlarge.

BorgWarner is supplying its high-performance wet friction technology for Volkswagen Group’s DQ 400e dual-clutch transmission (earlier post)—the Group’s main near-term gearbox for all hybrid and plug-in hybrid applications that are transverse. (Earlier post.) Current examples include the Golf GTE and Audi A3 e-tron.

This core transmission for hybrid vehicles with transversely mounted engines employs three clutches—two drive clutches (K1/K2) plus an engine-disconnect clutch (K0). An 80 kW, 330 N·m (243 lb-ft) three-phase permanently excited synchronous machine is located in the hybrid module on the input shaft, between the engine-disconnect clutch K0 and the drive clutches (K1/K2).

For all three clutches, BorgWarner’s wet friction technology significantly improves shift performance and noise, vibration and harshness (NVH) while improving fuel economy.

Today’s global transmission designs require reduced package size, improved shift quality and increased durability. Our advanced friction materials provide improved heat resistance, high torque capacity and reliable operation over the transmission’s lifetime. BorgWarner’s advanced friction technology is designed for a variety of applications, including wet starting clutches, torque converter lock-up clutches, torque transfer clutches and hybrid disconnecting clutches.

—Robin Kendrick, President and General Manager, BorgWarner Transmission Systems

For the hybrid disconnecting clutch in the DQ 400e transmission, BorgWarner’s friction plates enable smooth, quick shifts between the electric engine and the drivetrain. Even when modern low-viscosity oil is used, the friction material resists oil degradation and glazing.

The friction plate’s unique groove design helps fulfill the highest requirements in terms of stable friction coefficients and high temperature resistance. As a result of their surface characteristics, the friction linings rapidly absorb the oil and release it again during shifting processes involving high pressures.

Specially designed grooves on the friction material which are integrated into the friction lining for oil flow and cooling provide very low losses at the clutch in the open state, enable high transmission efficiency and smooth shifting capability while increasing fuel economy.


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