What does a 7-speed wet dual-clutch transmission mean in cars?
2 Answers
Automotive 7-speed wet dual-clutch refers to a dual-clutch transmission with 7 forward gears, utilizing wet-type clutches. Definition of Dual-Clutch: Dual-clutch, namely Dual-Clutch Transmission (DCT), differs from conventional automatic transmission systems. It belongs to both manual and automatic transmissions, combining the flexibility of manual transmissions with the comfort of automatic transmissions while providing uninterrupted power output. Working Principle of Dual-Clutch: The dual-clutch automatic transmission is based on the manual transmission. Simply put, this transmission type has two clutches: one controls gears 1, 3, 5, and 7, while the other controls gears 2, 4, and 6. When using first gear, second gear is already prepared, similarly reducing shift time significantly with no delay.
A 7-speed wet dual-clutch transmission means the vehicle's gearbox has 7 forward gears plus a wet dual-clutch structure. Simply put, the dual-clutch system involves two clutches working alternately—one managing odd-numbered gears like 1st, 3rd, 5th, and 7th, while the other handles even-numbered gears such as 2nd, 4th, and 6th. Gear shifts happen automatically without pressing a clutch pedal, delivering rapid acceleration without jerking. The 'wet' design means the clutch plates are bathed in oil for cooling, enhancing durability—ideal for high-power vehicles or stop-and-go traffic, unlike dry clutches prone to overheating. This setup excels in highway or mountain driving, offering fuel efficiency and agile response, favored by performance cars or family SUVs (e.g., Volkswagen Golf GTI). Though costlier and requiring specialized fluids for maintenance, it ensures smooth driving, though beginners may need to adapt to gentle throttle inputs.
