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Old 06-26-2015, 12:20 AM   #1 (permalink)
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Film: 1950s Army planetary gear demonstration model

Learning about planetary gears by trying to visualize how they work, and I came across this neat old training film. Seems I'm not alone in needing animation to understand!



And here is a different and also excellent demonstration, using computer animation:


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Old 06-26-2015, 10:32 AM   #2 (permalink)
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I Love this stuff!!!

It amazes me how much advancements were made and discovered in the early 40's through the late 50's.

I think planetary gears transmissions auto type transmission are just the perfect package. Compact and strong as Hell.
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Old 06-26-2015, 02:54 PM   #3 (permalink)
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I've never been a big fan of planetary gear sets. But it's possible that's because I associate them with automatic transmissions, which I strongly dislike...

-soD
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Old 06-26-2015, 04:08 PM   #4 (permalink)
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Quote:
Originally Posted by some_other_dave View Post
I've never been a big fan of planetary gear sets. But it's possible that's because I associate them with automatic transmissions, which I strongly dislike...

-soD
Me too. Dislike. But my electric bike has a set in the hub motor, and I am trying to understand the mechanism to understand how to hack it.
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Old 06-26-2015, 07:00 PM   #5 (permalink)
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Quote:
Originally Posted by pgfpro View Post
I Love this stuff!!!

It amazes me how much advancements were made and discovered in the early 40's through the late 50's.

I think planetary gears transmissions auto type transmission are just the perfect package. Compact and strong as Hell.
Yes, quite so...

Did you notice that explanation of the two-input planetary gearsets used in tanks? That's exactly how Toyota's groundbreaking Hybrid Synergy Drive works (specifically the "Power Split Device").

Toyota Prius - Power Split Device
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Old 06-26-2015, 07:09 PM   #6 (permalink)
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Quote:
Originally Posted by some_other_dave View Post
I've never been a big fan of planetary gear sets. But it's possible that's because I associate them with automatic transmissions, which I strongly dislike...

-soD
Some of the most robust manual transmissions use planetary gearsets. In drag racing, Lenco transmissions are used on very high powered cars because conventional manuals won't handle the torque. The reason they can handle the torque are planetary gear sets.
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Old 06-26-2015, 08:33 PM   #7 (permalink)
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This is "how" the differential-gearset (left) is related to the planetary-gearset (right, ala' Prius):

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Old 06-26-2015, 08:41 PM   #8 (permalink)
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Quote:
Originally Posted by darcane View Post
Some of the most robust manual transmissions use planetary gearsets. In drag racing, Lenco transmissions are used on very high powered cars because conventional manuals won't handle the torque. The reason they can handle the torque are planetary gear sets.
That's a pretty cool detail. My "dislike" was only about the classic auto. CVTs attract me, a little. But I had no idea planetary gears were going into manual transmissions for drag racing. Here are a couple Lenco tranny images...




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See my car's mod & maintenance thread and my electric bicycle's thread for ongoing projects. I will rebuild Black and Green over decades as parts die, until it becomes a different car of roughly the same shape and color. My minimum fuel economy goal is 55 mpg while averaging posted speed limits. I generally top 60 mpg. See also my Honda manual transmission specs thread.



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