See the amazing hybrid transaxle used in the 2019-2022 Toyota RAV4 Hybrid. Learn how this incredible transaxle functions in all nine modes of operation to help its sophisticated 2.5L engine deliver almost 40% brake thermal efficiency (BTE) for maximum fuel economy. This transaxle is also used in the 2018 and above Camry Hybrid, Avalon Hybrid, Lexus ES300h hybrid, and 2021 Venza Hybrid.
Corrections and additions:
1. Addition: In EV mode, sling lubrication from gear movement is provided to drip channels that feed bearings, gears, and stator cooling. The RAV4 Prime uses an external electric oil pump for use in EV mode.
2. The 2021 Toyota Venza Hybrid also uses the P710 transaxle.
3. Correction: At 27 minutes: In overdrive with MG1 spinning backward, the ICE RPM should be less than when it is in direct drive. I incorrectly said the ICE RPM was higher.
4. Correction: The BTE chart at 23:06 is the wrong one for this ICE, it is for the non-hybrid ICE variant known as A25A-FKS (The related experiment is done by EPA, which provides all the details), while the engine for the Hybrid RAV4 is A25B-FKS with a slightly higher peak efficiency to 41%. The BTE plot of A25B is different from the A25A, with lower maximum torque, and a much larger high-efficiency area (it reaches 38% efficiency at 80 Nm until 2500 RPM), and the peak efficiency point/area is shifted to the left/downside.
Motor Age and PTEN are thrilled to partner with WeberAuto to bring videos on hybrid and electric technology to our readers. John D. Kelly is a professor of Automotive Technology at Weber State University in Layton, Utah. Learn more about the program here and click here to donate.
