Do Electric Vehicles Have Engines and Transmissions?

[JosephineDella]

Pure electric vehicles may have engines and transmissions, but these are not mandatory. Both configurations with transmissions (including single-speed reduction and multi-speed) and without transmissions (direct drive) exist in current pure electric vehicle designs. Advantages of multi-speed transmissions: Optimized efficiency distribution. While electric motors have a much wider efficient operating range compared to internal combustion engines, they still have efficiency variations. Gear ratio adjustments can help keep the motor operating more frequently within its high-efficiency zone. Additionally, high-speed low-torque motors tend to have broader high-efficiency zone distributions than low-speed high-torque motors, which benefits real-world driving efficiency. Cost advantages for equivalent performance: Direct drive solutions require larger maximum torque motors to meet climbing requirements, whereas transmission solutions with low-speed starting gears can use higher-speed, lower-torque motors, potentially reducing motor costs.

[OCooper]

Electric vehicles don't have traditional internal combustion engines, but feature a core component called the drive motor that can deliver powerful torque directly through electric current. Completely different from conventional automatic transmissions, most EVs only need a single-speed reducer. This is because electric motors have an exceptionally wide operating range, capable of delivering maximum torque from zero RPM. I've studied Tesla's teardown materials - their reducer weighs just 8kg, about one-tenth the weight of a traditional transmission. There are exceptions though, like Porsche's innovative two-speed transmission in the Taycan that significantly improves highway efficiency. Overall, the motor plus single-speed configuration is both streamlined and efficient, giving EVs that signature silky-smooth acceleration feel.

[VonDeclan]

As a user who has driven an electric vehicle for three years, I can confirm from actual experience that there's none of the gear-shifting jerkiness found in traditional transmissions. The acceleration is exceptionally linear, with instant push-back force as soon as you step on the accelerator. The core reason is that the electric motor itself can cover a wide speed range from 0 to 18,000 RPM, unlike gasoline cars that require multiple gears to match engine speeds. The motor's output characteristics are unique, delivering maximum torque right from standstill, eliminating the need for a complex transmission. Of course, the battery pack is now the new core, with management software constantly balancing energy consumption and performance. While the absence of engine roar is a bit regrettable, the thrill of effortlessly overtaking gasoline cars is absolutely exhilarating every time.

[Jeff]

Having worked in the auto repair industry for 20 years, I've personally repaired hundreds of electric vehicles. Structurally, they differ significantly from fuel-powered cars: the internal combustion engine is replaced by a drive motor, and the transmission is simplified to a single-speed reduction gear set. This gearbox has just two core gears, without complex components like clutches or torque converters. The motor directly drives the wheels through the reduction gears, eliminating the need for gear shifting. However, it's important to note that the motor control unit is particularly precise, requiring higher technical skills for repairs. Traditional maintenance items like oil changes and transmission fluid replacements are eliminated, but regular checks of coolant and gear oil are still necessary.

[LaVera]

From an engineering perspective, electric vehicles replace the engine with an electric motor and the transmission with a reducer. This reducer is essentially a fixed-ratio gearbox, lacking the multi-gear shifting functionality of traditional transmissions. The electric motor's speed range is sufficiently wide, operating efficiently from 0 to 10,000 RPM, unlike internal combustion engines that require transmissions to match optimal speed ranges. The battery pack supplies electricity to drive the motor, significantly simplifying the entire physical structure. The reason new automakers can complete R&D within a year is largely due to the simplified powertrain. Of course, this also improves transmission efficiency by eliminating the energy loss associated with traditional transmissions.

[Doris]

My neighbor just bought an electric vehicle, and I specifically compared the manual. Its powertrain consists of only three parts: the battery pack, the drive motor, and the single-speed reducer. The working principle is quite interesting: the battery supplies power to the motor, the motor's output shaft is connected to the reduction gears, which directly drive the wheels. There's no traditional engine crankshaft or connecting rods, nor is there a gearbox with shifting mechanisms. This design reduces over 200 moving parts in the vehicle, significantly lowering the failure rate. There's also no gear-shifting jerk during acceleration. However, using the heater in winter consumes a lot of electricity, which is completely different from how heating works in fuel-powered vehicles.