That is great. Nothing is better that having a such fantastic class as detailed as possible deeply inside the transaxle. Thanks for sharing. You did great!
I always wondered why, when I cruise at 65mph, the traction battery doesn't charge much. Now I understand what's going on. It's not a fault! Thank-you John. Brilliant explanation 👍
How anyone could dislike your videos is beyond me. I think they’re fantastic! Thank you for doing them. I recently acquired a 2013 Lexus ES300H and have been very curious how it all works. I assume my powertrain is similar to maybe like a 3rd gen Prius maybe?
Thank you so much. I `ve understood not all because of my English skills, but it was one of the most epic and interesting video, which I`ve ever watched.
Very informative. Thank you very much as you must have put an incredible amount of time and effort into produces these well-organized and thoughtful videos.
Any two components at the same speed, with the same direction of inputing torque, or any two components connected together, the entire PSD lock into a whole part, and than the third component at the same speed, the same direction outputing torque. Like the THIRD GEAR(direct power mode) inside the 4AT. I do love your a series of videos!
Nice to see the continued reduction of complexity every generation. One less planetary gear assembly compared to last gen. I would think the reliability will be increased compared to last gen even though it was already super reliable.
Planetary gear sets are incredibly reliable. They are what automatic transmissions are based on and they are NOT the parts that fail in an auto. It's the clutches and bands that control those gear sets that wear and fail, but in the prius transaxles, those functions are performed by MG1. it seems to me the change may have been made for packaging (shorter casing?), simplicity of changing reduction gear ratios between models and of course, production cost.
Dear Professor Kelly, Your virtual classes are very informative and easy to follow (pause button has been very helpful). Keep up the great work in educating us! I watched this video multiple times, making my own sketches and notes... I think I understand this transaxle now. May I ask you one question? My remaining doubt: In the videos you used the expression that "MG1 sends power to MG2". Is this done always & only via the HV Battery? Or is there another way (in the power electronics) that the electric current generated by MG1 (acting as generator) goes directly via windings to MG2 (acting as e-motor)? I came across the Inverter Assembly diagram of HSD Gen 3 and I am not able to find any direct link from MG1 to MG2. Your kind reply will be highly appreciated. Thank you in advance. Regards from Finland
1. In 4th gen transaxle mg1 can also contribute to driving vehicle without starting the engine? 2. The one way spray clutch completely stop and will rotate the crankshaft and fly wheel in the opposite direction of rotation so that the, power split planet carrier will be held so that mg1 can assist mg2 through the counter drive and driven gears to drive the vehicle right?
I wonder if we can use the principal of differential gears to do the power split function? The engine is hooked up to the outside of a ring gear. A few spider gears are attached on the inside. The spider gears then split the power to two opposed side gears where two motor generators are mounted.
Dear Sir John, you had mentioned there's an one-way clutch preventing the carrier shaft to crank up the engine during reverse revolution of planet carrier. Here's the thing, if there's an one-way clutch between the carrier shaft and the flywheel. Once the engine cranked up and running, engine speed, RPM, won't out run the one-way clutch? Cause the flywheel to be freed from the carrier shaft, not transmitting torque to the planet carrier? Thanks and looking forward for your reply.
Fantastic & thank you very much, Professor! I have a question about the operation when shifter is in 'B' position. I wonder about what the transaxle does because I observe that once I drive downhill in 'B' position, the engine will rev up in proportion to the vehicle speed. Does the transaxle system lock up MG1 to achieve engine braking? My OBD2 showed up to >3000 RPM when I drove down the mountain decent. The OBD could not tell MG1 speed, so I can only guess. Many thanks in advance!
Thank you John. I always enjoy your videos! I have two 017 Prius’. One is a Prius 3 and the other is a Prime Premium. The Prime developed an ATF leak up front near the driver side wheel well and I discovered that it has a little electric oil pump that circulates the oil external to the transaxle which I believe is for extra cooling. Why doesn’t the Prius 3 use this and does the Prime also have the internal oil drive that the 3 has?
Thank you. The RAV4 uses the P314 which is a larger version of the P410. The RAV4 does use the Q211 electric rear axle. I will be doing a video on it soon. Thanks for your feedback.
@@alkekm313 The P314 is just a larger version of the P410 shown here: ua-cam.com/video/5lg6yC5_-Bs/v-deo.html the Q211 is here: ua-cam.com/video/KuR0cihFAvQ/v-deo.html Thank you!
at 22.52 If the internal gear of a ring gear is spinning in opposite direction, does then the car is going in reverse?Did not get that.... does the internal gear of ring gear spinns in same direction always?Best regards from Croatia.. got it, explaind in p710
At 22 minutes in the discussion of MG1 / ICE: if the ICE is supplying torque to the wheels the MG1 must act as a brake, otherwise MG1 would spin free and no torque would go to the wheels. I also imagine that the braking action by MG1 could be at any rpm and in either direction. Am I right or wrong?
Thank you Professor Kelly for an excellent instructional video 👌 I am about to buy a new Toyota C-HR 2024 with e-cvt drive 5th generation. Is there a big change from the 4th generation? I send you the warmest greetings from Poland 🇵🇱
Hello , I have a question for you. I have transmission where the outer cover has a little damage and I have donor transmission with good one . Is it practical to just replace that outer cover without tearing down whole transaxle ? I already removed cover from the donor transmission . I saw those phaser sensors and oil pump spline shaft and I played to place it back on than removed it again and figured it was not an issue as long as you take your time and align oil pump shaft before start going back together . So cover goes back on effortlessly . Please share your thought , what do you think about that . Thank you .
Why not connect MG2 to the rear axle making its replacement easier? MG2 is connect to the wheels anyway. I am assuming the front and rear wheels are spinning at the same speed. This would allow MG1 to be bolted on to the sun gear via a shaft so it can easier be replaced without disassembling the transmission.What say you Prof. Kelly?
Can someone explain to me why the first Lexus GS 450h has a “two stage” hybrid system? I know that the engine revs shift at around 60-70 MPH but my understanding is that it’s the same basic design as the normal hybrid synergy drive.
Hello, Professor Kelly. I have a question: if Prius Plug-In (and any other Prius too) moves in EV mode down the road, does gearbox get no lubrication? Because of oil pump is driven from combustion engine. Thanks a lot!
When I let go of the throttle in my 2013 Prius+ (PriusV) and start to coast (at a bit higher speed) and once the speed drops to around 47mph (75kph) I feel a little jolt - sort of like the engine starts. Why is that? It happens every time and at the same exact speed.
Thanks for the video. I was wondering about bearing life since the MG2 spins a lot faster now any concern about reliability? All the videos you did on all the generations of Toyota transaxles are really helpful to understand the concept I'm not a Toyota person but I have way more respect now that I know how it works could you do some day the Audi A3 E tron system it's more in my car line thanks it's a unique configuration until Kia came out with a similar Hybrid system I wonder what are the major difference between the two systems I think Honda has a pretty clever system in the latest accord system .
Thank you! The bearings seem to be holding up just fine. Ball bearings are used in devices that have much higher rotational speeds. The Audi A3 E-tron system is not unique. It appears to be patterned after the Honda Integrated Motor Assist (IMA) system used in Honda hybrids from 2000-2014. The Kia version adds a belt driven motor to the engine to help drive the crankshaft. The newer Honda two motor hybrid is totally unique.
That was pretty cool. I have seen, what looked like, gold plated ball bearings in the Chevrolet Volt transaxle. I suspect it is to alleviate a similar situation. The Nissan leaf transaxle has actual brushes on several shafts. I would love to have a Tesla powertrain at the school. Thanks again.
For older generations ice compulsory to turn at certain vehicle speed, how about this generation? And at what vehicle speed ice need to turn for this generation?
Toyota says 84 mph. The new motor rotors have a higher maximum rpm of 17000. At 100 mph, MG1 is at 12,161, MG2 is at 14,582. As you can see, neither motor is at it's maximum rpm. I suspect is is more of a power supply issue.
Dear professor Kelly, your video presentations are both interesting and educational! I’m following the description of this Prius transaxle , then I can’t follow how and when the ICE speed changes?
I like what I've seen in this video. This Prius transmission seems to be much more durable than a CVT with a belt drive. Are the rotors and stators for MG1 and MG2 in a different housing, not shown in this video, separate from the geared parts of the transaxle and I assume "dry", i.e. not filled with oil?
@@josephgriffin1065 - Thanks. I've seen a more detailed teardown video on the Toyota HSD transaxle, and in that video, it's clearly shown that transmission fluid is actually deliberately sprayed onto the stator coils to carry away excess heat. The fact that the oil is not only there for lubrication, but also for direct cooling of the stator, makes it very important to change out the oil at the proper intervals: dirty oil is less able to resist the formation of electrical shorts between the stator coils and the transaxle housing, or arcing between the three-phase power-supply cables (which are carrying 500 volts more or less). Electrical shorts inside the transaxle are really, really bad, not to mention expensive, like $3000 for parts and labor to replace the MG2 stator if it shorts out and gets damaged.
Great video. F1 seamless shift transmission is it a normal sequential gearbox or more advance type ? Can't really understand how seamless works. Any video about seamless from you ? Thanks.
i'm curious about how reliable these are and what is the expected life span of these....how many miles before problems become expected. ty and excellent presentation.
Thank you! This transaxle is only two years old in Toyota's but, the same design has been used since 2005 in Ford hybrids. They have been very reliable.
Great channel. Thank you for sharing your knowledge. Question....What damage occurs to the hybrid system when a Prius is towed with all 4 wheels on the ground?
Great video, even if still do not understand the transmission completely (Due to lack of know how and my english skills). Has the new Toyota Auris 2016 (tourings sports) the same transaxle? Thank you :)
Is it because the Prius Prime now uses MG1 to aid the MG2 in driving the vehicle at high speed that the gearing now is lower for MG2 vs. MG1? From what I understand MG2 is still the primary traction motor, but given its smaller size & power ratings vs. older P410 design that the Prime operating in EV mode would need the MG1 to help, and since the latter is geared higher (1 turn of MG1 = 1.2 turns of MG2) it contributes to greater efficiency at higher speeds while MG2 is better at lower speeds. At least, that's what I imagine Toyota was thinking. In contrast, Ford in the HF35 has almost geared its MG2 & MG1 to operate on almost a 1:1 fixed ratio - since the Fusion Energi doesn't use its MG1 for traction driving purposes the motor is geared mainly as a generator & to act as a "gearing" to allow the power-split device transaxle to pass engine torque to the wheels.
These videos are very educational and one question though where is that new pulley in the power transmission? In other words, what the difference between eCVT and normal CVT? Does that transaxel then go thru another transmission system or is it connected straight to the wheels?
Fascinating ! John I'm trying to understand the benefits of a Hybrid vehicle. Is it that you are recapturing energy when the vehicle is coasting ? Another words when the ICE is turning MG1 to charge the batteries, your still using energy or gasoline. Does the higher MPG come from recaptured energy that other wise would be lost ? Thanks ! Take Care !
Thank you! Yes, that is part of it. The high mpg comes from the combined electric motors and ICE propelling the vehicle rather than just an ICE. the motors at low speed and combined motors and ICE at higher speeds. A large part of your daily driving is coasting or braking. Hybrids capture part of that energy and use to charge the battery for the motors. Have a good day!
Awesome ! Thanks to you I now have a good understanding of how these Hybrids work ! Prior to watching this series of vids it was taboo to me ! Thanks !
I guess you would expect each generation of Prius to be more efficient than previous generation and get better MPG. This is how it's done, they invent lighter more efficient tech. I find nothing wrong with this evolution. I'm sure the tech in new motors is made from higher quality components to cope with higher rpm.
I am trying to understand why my car (a 2014 Geely Emgrand7) of nearly 4 years (bought new in 2013 Aug) has suddenly started to jerk violently when I start the car early in the morning. Today it was a violent one, it was really frightening. It died down after about few seconds, everything coming back to normal. I had about 50kms left of Petrol (not diesel) I believe - I monitor my millage very religiously. After filling the car at the pump, starting the incident did NOT occur, and also I stopped at the mechanic but did not find anything wrong while turning on the ignition. This time it was a bit more violent than previously I felt. What could this be? The car agency did not find anything wrong after the service (70,000 kms) (it wasn't a major checkup, though) Also while driving there is a perceptible rare knocking from underneath, from where I wouldn't know, but it is definitely there. This perceptible and rare knocking effect has become mild after the service. Can you Please advise me. Thank you
thank you for your precision in explaining everything. I have a question, Here in europe Toyota sells a small hybrid cas, called Yaris, I don't know whether is sold also in USA. The last model is 2017, do you know whether it features the same P610 transaxle, maybe in a smaller version? Thank you again
@@heathbauerle2787 I don't know, there ar many yaris around here, gasoline and hybrid modelsit's pretty common car but I don't know where are they made.
@@fabriziooldrini6888 I personally go online and see were the ones in my area are made used (and new) and plug their vins into Toyota website and I get the information needed. I have no idea if that works in in Europe or not.
This is kind of interesting. It's unfortunate I don't have the cognitive capabilities to learn such complex topics. I would have loved being an engineer. Maybe in another life...
I’m supposed to be studying for a pharmacology exam. Why am I here?
Great information like always. I really appreciate these videos being public.
That is great. Nothing is better that having a such fantastic class as detailed as possible deeply inside the transaxle. Thanks for sharing. You did great!
Thank you!
This is the best and deepest technical information about this kind of transaxles I've ever seen - thank you.
I have been following WebAuto Channel for over a year.Thanks Professor John D. Kelly brings us a lot useful videos.
Thank you!
@@WeberAuto No man, thank you!
Great vid....I own 2 Prius after training with Toyota 10 years ago. By far the best car's I've ever owned.
Thank you!
It's GREAT!!! The best video I have been watch for ever, regarding e-CVT transaxel. THANK YOU!
Although my mother language is not english I understand you very clearly!
Thank you
great compilation of all 4th genertion transaxle. thanks for sharing Mr Kelly
Thank you!
I always wondered why, when I cruise at 65mph, the traction battery doesn't charge much. Now I understand what's going on. It's not a fault! Thank-you John. Brilliant explanation 👍
Thank you for making sure the numbers are correct by reading the from written tables.
How anyone could dislike your videos is beyond me. I think they’re fantastic! Thank you for doing them. I recently acquired a 2013 Lexus ES300H and have been very curious how it all works. I assume my powertrain is similar to maybe like a 3rd gen Prius maybe?
Thank you so much. I `ve understood not all because of my English skills, but it was one of the most epic and interesting video, which I`ve ever watched.
Very informative. Thank you very much as you must have put an incredible amount of time and effort into produces these well-organized and thoughtful videos.
This man is awesome. Thanks for sharing your wealth of knowledge
I appreciate that!
Excelent work Mr. John Kelly !
Thank you!
Awesome video. I have a new admiration for the way the Prius works.
Thank you!
Great video lecture. Congratulation you are a true professional.
I love how UA-cam now let you play video at 2x
Great video thanks professor
Nailed it, as per usual.
Thank you!
Thanks a lot, I am happy to see the all video.
Very informative presentation. Big thanks!
Thank you!
Great video! Thanks for doing this.
Thank you!
Excellent explanation, congratulation!!!
Thanks for your time and efforts!
Elegant design and engineering
Thank you, sir!
Fantastic video. Thanks!
Thank you!
Thank you very much for this detailed explanation.
Admire you my best teacher ...! May Lord 🙏 always bless you.
Any two components at the same speed, with the same direction of inputing torque, or any two components connected together, the entire PSD lock into a whole part, and than the third component at the same speed, the same direction outputing torque. Like the THIRD GEAR(direct power mode) inside the 4AT.
I do love your a series of videos!
Yes, that is correct. Thank you!
Very interesting. I always like your videos. Many thanks.
Thank you!
"Let me press that out real quick" like it's no biggie :)
LOL, Thanks for watching
21:22 so if I want the best charge speed in charge mode I need to drive at that speed so the engine spins mg1 constantly?
Nice to see the continued reduction of complexity every generation. One less planetary gear assembly compared to last gen. I would think the reliability will be increased compared to last gen even though it was already super reliable.
Thank you!
Planetary gear sets are incredibly reliable. They are what automatic transmissions are based on and they are NOT the parts that fail in an auto. It's the clutches and bands that control those gear sets that wear and fail, but in the prius transaxles, those functions are performed by MG1. it seems to me the change may have been made for packaging (shorter casing?), simplicity of changing reduction gear ratios between models and of course, production cost.
Excellent Video
Thank you!
I would love to see you get your hands on the TH2A from the 2019-2020 Subaru Crosstrek PHEV.
Excellent teaching thanks .!
Thank you!
Awesome thanks 👍
Dear Professor Kelly,
Your virtual classes are very informative and easy to follow (pause button has been very helpful).
Keep up the great work in educating us!
I watched this video multiple times, making my own sketches and notes... I think I understand this transaxle now.
May I ask you one question? My remaining doubt:
In the videos you used the expression that "MG1 sends power to MG2".
Is this done always & only via the HV Battery?
Or is there another way (in the power electronics) that the electric current generated by MG1 (acting as generator) goes directly via windings to MG2 (acting as e-motor)?
I came across the Inverter Assembly diagram of HSD Gen 3 and I am not able to find any direct link from MG1 to MG2.
Your kind reply will be highly appreciated.
Thank you in advance.
Regards from Finland
MG2 always propels the vehicle. MG1 and the ICE can contribute torque to MG2 to help it.Thanks for your feedback
Wow. Thanx from german gen3 driver.
1. In 4th gen transaxle mg1 can also contribute to driving vehicle without starting the engine?
2. The one way spray clutch completely stop and will rotate the crankshaft and fly wheel in the opposite direction of rotation so that the, power split planet carrier will be held so that mg1 can assist mg2 through the counter drive and driven gears to drive the vehicle right?
I wonder if we can use the principal of differential gears to do the power split function? The engine is hooked up to the outside of a ring gear. A few spider gears are attached on the inside. The spider gears then split the power to two opposed side gears where two motor generators are mounted.
You could, but the rotational speeds can be better controlled with a planetary gear set. Thanks for your feedback
Great video, is this the same system what is in the 2016 toyota auris hybrid
Hi professor John Kelly, Thanks for the class. i am curious about how the transaxle put into Neutral gear?
Dear Sir John, you had mentioned there's an one-way clutch preventing the carrier shaft to crank up the engine during reverse revolution of planet carrier.
Here's the thing, if there's an one-way clutch between the carrier shaft and the flywheel. Once the engine cranked up and running, engine speed, RPM, won't out run the one-way clutch? Cause the flywheel to be freed from the carrier shaft, not transmitting torque to the planet carrier? Thanks and looking forward for your reply.
Fantastic & thank you very much, Professor! I have a question about the operation when shifter is in 'B' position. I wonder about what the transaxle does because I observe that once I drive downhill in 'B' position, the engine will rev up in proportion to the vehicle speed. Does the transaxle system lock up MG1 to achieve engine braking? My OBD2 showed up to >3000 RPM when I drove down the mountain decent. The OBD could not tell MG1 speed, so I can only guess.
Many thanks in advance!
Thank you John. I always enjoy your videos! I have two 017 Prius’. One is a Prius 3 and the other is a Prime Premium. The Prime developed an ATF leak up front near the driver side wheel well and I discovered that it has a little electric oil pump that circulates the oil external to the transaxle which I believe is for extra cooling. Why doesn’t the Prius 3 use this and does the Prime also have the internal oil drive that the 3 has?
Great info, what a fantastic tranny design so simple not much to go bad, still trying to wrap my head around it.
Thanks for watching!
Great video, only Toyota RAV4 Hybrid left for showing i suppose(if you have it). :)
Thank you. The RAV4 uses the P314 which is a larger version of the P410. The RAV4 does use the Q211 electric rear axle. I will be doing a video on it soon. Thanks for your feedback.
@@WeberAuto Love your video lessons. Did you ever get to make one on the Rav4 hybrid P314 and Q211? Thanks.
@@alkekm313 The P314 is just a larger version of the P410 shown here: ua-cam.com/video/5lg6yC5_-Bs/v-deo.html the Q211 is here: ua-cam.com/video/KuR0cihFAvQ/v-deo.html Thank you!
at 22.52 If the internal gear of a ring gear is spinning in opposite direction, does then the car is going in reverse?Did not get that.... does the internal gear of ring gear spinns in same direction always?Best regards from Croatia.. got it, explaind in p710
Thanks for watching
At 22 minutes in the discussion of MG1 / ICE: if the ICE is supplying torque to the wheels the MG1 must act as a brake, otherwise MG1 would spin free and no torque would go to the wheels. I also imagine that the braking action by MG1 could be at any rpm and in either direction. Am I right or wrong?
Dear sir, could please give us TOYOTA CAMRY 2018 -2020 HYBRID videos please.
Thank you Professor Kelly for an excellent instructional video 👌 I am about to buy a new Toyota C-HR 2024 with e-cvt drive 5th generation. Is there a big change from the 4th generation?
I send you the warmest greetings from Poland 🇵🇱
Hello , I have a question for you. I have transmission where the outer cover has a little damage and I have donor transmission with good one . Is it practical to just replace that outer cover without tearing down whole transaxle ? I already removed cover from the donor transmission . I saw those phaser sensors and oil pump spline shaft and I played to place it back on than removed it again and figured it was not an issue as long as you take your time and align oil pump shaft before start going back together . So cover goes back on effortlessly . Please share your thought , what do you think about that . Thank you .
Why not connect MG2 to the rear axle making its replacement easier? MG2 is connect to the wheels anyway. I am assuming the front and rear wheels are spinning at the same speed. This would allow MG1 to be bolted on to the sun gear via a shaft so it can easier be replaced without disassembling the transmission.What say you Prof. Kelly?
Can someone explain to me why the first Lexus GS 450h has a “two stage” hybrid system? I know that the engine revs shift at around 60-70 MPH but my understanding is that it’s the same basic design as the normal hybrid synergy drive.
Hello, Professor Kelly. I have a question: if Prius Plug-In (and any other Prius too) moves in EV mode down the road, does gearbox get no lubrication? Because of oil pump is driven from combustion engine.
Thanks a lot!
thanks for sharing ...
Thank you!
How does this transmission accomplish reverse? Are they just reversing the polarity on mg2? To make it spin backwards?
Yes, just reversing the motor
Ron Schul the original 1st gen Prius couldn’t go up steep inclines in reverse lol because the electric motor just wasn’t powerful enough.
When I let go of the throttle in my 2013 Prius+ (PriusV) and start to coast (at a bit higher speed) and once the speed drops to around 47mph (75kph) I feel a little jolt - sort of like the engine starts. Why is that? It happens every time and at the same exact speed.
Thanks for the video. I was wondering about bearing life since the MG2 spins a lot faster now any concern about reliability? All the videos you did on all the generations of Toyota transaxles are really helpful to understand the concept I'm not a Toyota person but I have way more respect now that I know how it works could you do some day the Audi A3 E tron system it's more in my car line thanks it's a unique configuration until Kia came out with a similar Hybrid system I wonder what are the major difference between the two systems I think Honda has a pretty clever system in the latest accord system .
Thank you! The bearings seem to be holding up just fine. Ball bearings are used in devices that have much higher rotational speeds. The Audi A3 E-tron system is not unique. It appears to be patterned after the Honda Integrated Motor Assist (IMA) system used in Honda hybrids from 2000-2014. The Kia version adds a belt driven motor to the engine to help drive the crankshaft. The newer Honda two motor hybrid is totally unique.
That was pretty cool. I have seen, what looked like, gold plated ball bearings in the Chevrolet Volt transaxle. I suspect it is to alleviate a similar situation. The Nissan leaf transaxle has actual brushes on several shafts. I would love to have a Tesla powertrain at the school. Thanks again.
For older generations ice compulsory to turn at certain vehicle speed, how about this generation? And at what vehicle speed ice need to turn for this generation?
Toyota says 84 mph. The new motor rotors have a higher maximum rpm of 17000. At 100 mph, MG1 is at 12,161, MG2 is at 14,582. As you can see, neither motor is at it's maximum rpm. I suspect is is more of a power supply issue.
Hi Sir ! Is the transmission for toyota fielder U341E-07A can be replace with transmission U341E-01A Thank you!
Dear professor Kelly, your video presentations are both interesting and educational!
I’m following the description of this Prius transaxle , then I can’t follow how and when the ICE speed changes?
I guess this is all automatic? Because there’s observation by other hybrids drivers saying about non linear engine noise when down the road!
Does the new (2019-) Corolla Hybrid also use the 4th generation Prius technology?
I like what I've seen in this video. This Prius transmission seems to be much more durable than a CVT with a belt drive. Are the rotors and stators for MG1 and MG2 in a different housing, not shown in this video, separate from the geared parts of the transaxle and I assume "dry", i.e. not filled with oil?
The stators are in the other half of this housing, and it does have oil in it.
@@josephgriffin1065 - Thanks. I've seen a more detailed teardown video on the Toyota HSD transaxle, and in that video, it's clearly shown that transmission fluid is actually deliberately sprayed onto the stator coils to carry away excess heat. The fact that the oil is not only there for lubrication, but also for direct cooling of the stator, makes it very important to change out the oil at the proper intervals: dirty oil is less able to resist the formation of electrical shorts between the stator coils and the transaxle housing, or arcing between the three-phase power-supply cables (which are carrying 500 volts more or less). Electrical shorts inside the transaxle are really, really bad, not to mention expensive, like $3000 for parts and labor to replace the MG2 stator if it shorts out and gets damaged.
@Laura-Ann-Charlott, yes, very accurate
Great video. F1 seamless shift transmission is it a normal sequential gearbox or more advance type ? Can't really understand how seamless works. Any video about seamless from you ? Thanks.
It is my understanding that type of transmission must upshift and downshift through each gear (No skipping gears)
i'm curious about how reliable these are and what is the expected life span of these....how many miles before problems become expected. ty and excellent presentation.
Thank you! This transaxle is only two years old in Toyota's but, the same design has been used since 2005 in Ford hybrids. They have been very reliable.
Great channel. Thank you for sharing your knowledge. Question....What damage occurs to the hybrid system when a Prius is towed with all 4 wheels on the ground?
What is the output voltage on MG1?
is this the same transmission used in the Lexus cars?
Great video, even if still do not understand the transmission completely (Due to lack of know how and my english skills).
Has the new Toyota Auris 2016 (tourings sports) the same transaxle? Thank you :)
Thank you!
Piloseb I think that the Auris TS has a P410. It’s the previous gen powerunit.
Oh the plosives
Puh, tuh, buh, so on
Is it because the Prius Prime now uses MG1 to aid the MG2 in driving the vehicle at high speed that the gearing now is lower for MG2 vs. MG1? From what I understand MG2 is still the primary traction motor, but given its smaller size & power ratings vs. older P410 design that the Prime operating in EV mode would need the MG1 to help, and since the latter is geared higher (1 turn of MG1 = 1.2 turns of MG2) it contributes to greater efficiency at higher speeds while MG2 is better at lower speeds. At least, that's what I imagine Toyota was thinking.
In contrast, Ford in the HF35 has almost geared its MG2 & MG1 to operate on almost a 1:1 fixed ratio - since the Fusion Energi doesn't use its MG1 for traction driving purposes the motor is geared mainly as a generator & to act as a "gearing" to allow the power-split device transaxle to pass engine torque to the wheels.
No, the smaller size is compensated for by higher rotational speeds. The P610 and P410 are almost identical in power, but the P610 is lighter weight
Great tutorial professor, like always! Is p610 the transaxle used in 2016 RAV4 hybrid? Thanks in advance.
These videos are very educational and one question though where is that new pulley in the power transmission?
In other words, what the difference between eCVT and normal CVT? Does that transaxel then go thru another transmission system or is it connected straight to the wheels?
why the planet carrier and the counter gear are just like a toy? they are smaller and smaller from generation to generation.
My good sir, does the 2018-present camry have the 3rd or 4th gen transaxle?
Fascinating ! John I'm trying to understand the benefits of a Hybrid vehicle. Is it that you are recapturing energy when the vehicle is coasting ? Another words when the ICE is turning MG1 to charge the batteries, your still using energy or gasoline. Does the higher MPG come from recaptured energy that other wise would be lost ? Thanks ! Take Care !
Thank you! Yes, that is part of it. The high mpg comes from the combined electric motors and ICE propelling the vehicle rather than just an ICE. the motors at low speed and combined motors and ICE at higher speeds. A large part of your daily driving is coasting or braking. Hybrids capture part of that energy and use to charge the battery for the motors. Have a good day!
Awesome ! Thanks to you I now have a good understanding of how these Hybrids work ! Prior to watching this series of vids it was taboo to me ! Thanks !
I love the attention to detail in this video so thank you. Do you know what frequency these motors run at to achieve such crazy rpm?
Thank you! I do not know, but MG1 has 4 poles and MG2 has 5 poles
Do you publish the full report with all the component sizing?
No, just these videos
Is it better for the motor lifespan to spin faster or spin slower? My impression is that I prefer the previous generation.
Good question, there are several factors besides rpm to consider. rotational mass is another factor. The older generation rotors were very heavy.
I guess you would expect each generation of Prius to be more efficient than previous generation and get better MPG. This is how it's done, they invent lighter more efficient tech. I find nothing wrong with this evolution. I'm sure the tech in new motors is made from higher quality components to cope with higher rpm.
I am trying to understand why my car (a 2014 Geely Emgrand7) of nearly 4 years (bought new in 2013 Aug) has suddenly started to jerk violently when I start the car early in the morning. Today it was a violent one, it was really frightening. It died down after about few seconds, everything coming back to normal. I had about 50kms left of Petrol (not diesel) I believe - I monitor my millage very religiously. After filling the car at the pump, starting the incident did NOT occur, and also I stopped at the mechanic but did not find anything wrong while turning on the ignition. This time it was a bit more violent than previously I felt. What could this be? The car agency did not find anything wrong after the service (70,000 kms) (it wasn't a major checkup, though) Also while driving there is a perceptible rare knocking from underneath, from where I wouldn't know, but it is definitely there. This perceptible and rare knocking effect has become mild after the service. Can you Please advise me. Thank you
It could be related to the transmission, best wishes
There is no issue on this transmission unlike fusion transmission
True
Does Ford use this set up now?
Which transaxal do you prefer?
The P410 was great, we will see how the P610 does.
Does the car only have one gear?
Yes, the MG2 motor is all that drives the vehicle down the road; no shifting.
Thanks for the video!
I've got one question,on this differential, has the number of planets changed from 4 (previous model) to 3?
Thank you. Yes, good observation! That typically means it can handle less torque.
Un video de la transmisión P711 de corolla híbrido, gracias
thank you for your precision in explaining everything. I have a question, Here in europe Toyota sells a small hybrid cas, called Yaris, I don't know whether is sold also in USA. The last model is 2017, do you know whether it features the same P610 transaxle, maybe in a smaller version? Thank you again
They sell a Yaris here in the states but in reality , it is a Mazda 2 from Mexico. Is the Euro Yaris a true Toyota or same boat as America?
@@heathbauerle2787 I don't know, there ar many yaris around here, gasoline and hybrid modelsit's pretty common car but I don't know where are they made.
@@fabriziooldrini6888 I personally go online and see were the ones in my area are made used (and new) and plug their vins into Toyota website and I get the information needed. I have no idea if that works in in Europe or not.
@@heathbauerle2787 I am not expert, what is vins?
@@fabriziooldrini6888 VIN Numbers, like JTEZU5JR4F5093019 is the VIN number of a 2015 4Runner.
This is kind of interesting. It's unfortunate I don't have the cognitive capabilities to learn such complex topics. I would have loved being an engineer. Maybe in another life...
motor and its construction will disassemble? prius 4th
Thanks for your suggestion!
God jaan ceare
Awesome video, thanks for doing it!
Thank you!