Continuous Variable Transmission for Hybrids?

Question

Can anyone tell me where I can find an answer to the question - "Why do Hybrid electric vehicles need a Continuously Variable Transmission gearbox when BEVs do not"

davidwalker2 · Accepted Answer

I&rsquo;m not sure that I can give a definitive answer, but I can add to the information. An electric motor can have high torque from zero revs throughout the revs range so an all- EV does not need a gear box. 
 There are two types of hybrid, &ldquo;parallel&rdquo; or &ldquo;serial. In a parallel configuration the wheels can be driven by both an electric motor and a petrol motor, that also charges the battery. As the petrol motor drives the wheels directly it needs a gearbox to keep the engine revs within the acceptable torque range similar to a non-electric car. In a &ldquo;series&rdquo; hybrid, the electric motor drives the wheels directly so does not need a gearbox. The battery provides power to the electric motor and is charged by a petrol generator (the &ldquo;hybrid&rdquo; bit). This motor is constant revs for efficiency so does not need a variable gearbox. 
 David

Continuous Variable Transmission for Hybrids?

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