STEM-Multiple Speed Transmissions with Planetary Gears

Schedule time with Corey: mentoredengineer.com/consulting/
Planetary gear systems are commonly seen in power transmission to gain multiple speeds. We will look at two systems that accomplish this: bicycle gearboxes and car / truck automatic transmissions.

[@DerekMantei]

Amazing content buddy!

[@MentoredEngineer]

Glad you liked it!

[@josephschaefer9163]

I theorized a 31 speed trans with two ring, two planet sets, and two sun gears. Lots of shafts, hubs, and couplers to get all the outputs

[@MentoredEngineer]

That sounds incredible! What were the range of gear ratios between the input and output? I'd love to see a picture of the concept if you have one.

[@Eddingtonification]

Hi, I am Graeme John Eddington. Following is my CZcams post of my Multi-speed transmission I have called: "Opposing Torque Dynamic Clutch" which is a type of Infinitely Variable Transmission (IVT) which I believe is ideal for your current applications. Please log on to my CZcams video: czcams.com/video/SACDK89U7PM/video.html

[@josephschaefer9163]

@@MentoredEngineer I have a napkin sketch. Each ratio has a separate equation. I did not finish calculating them all. I don't know what the gear spacing will be. With 5-100 tooth count range it was like 300:1 to 0.2:1 ratios. Ratios very close to 1:1 are possible. One is 1:1 locked straight through, 10 are reverse and 20 are forwards. I'd like to make a model to play with, there's probably no practical use except lathes

[@mohammadfarzankia2636]

Good job 🎉

[@imadyousufzai2998]

Nice and informative videos sir

[@josephfiacchi5705]

Dose anyone make an industrial version of this?

[@leiladaquil6587]

May i know how many planetary gear sets in 4 speed automatic transmission?

[@MentoredEngineer]

I do not know specifically. I assume you want 4 + reverse. I think that it could be done with 4 sets.

[@timprussell]

You might find this interesting. Technically this is 2 gear sets and one of those is basically dividing the input in to two ratios and then using those in an Ravigneaux planetary gear set. czcams.com/video/QhIcVM9-F3I/video.html

[@BlackyBrownDestruction9337]

Bike cogs are easier to service and fix

[@fukuokainternationaldemocr1974]

A masterclass in dreadful explanations!

[@MentoredEngineer]

How could I make this better?

[@TekCroach]

Much explaining with words but less animation. 😢

[@MentoredEngineer]

Cool. Most people like the animations, but they take a lot of time to develop. I'll do less in the future.

[@bethoughtprovoking]

Too much explanation and not enough illustration.

[@MentoredEngineer]

Thank you for the feedback