MTFCA Forum

Interesting. Some of the modern automatic transmissions use this type of planetary transmission. However the principles are similar, the T does not use the ring gear.
Norm

Thankyou Bob. I have puzzled over that so many times. Especially when I'm working on one. That makes it so easy to see and understand. I have tried to explain it to engineers before but not adequately. Quite a puzzle.
Rich

In addition, it helps me understand the Weston Mott differential my early Buick and other cars had. The axles are keyed to drums with internal teeth cut into them. 3 pinions run in each drum and their shafts ride in the center section which a drive sprocket is bolted to. I haven't found much about it in old books or on the internet except what I have posted in the past. I thought it might be interesting to others. The drums also had brake shoes mounted early on. These were abandoned and drums were placed on the wheel hubs. I assume grease escaped and made stopping poor. Even the "non-fluid" oil recommended could seep out of the close machine fit between the drums and center sections. Gaskets were not workable at that point.
I had to have new drums made as the teeth were badly worn. Fortunately the fellow who made them had just finished another pair and still had the setup for them. They were still expensive as you can imagine.