Look at it like this. Measure the circumference of the tire on your tractor. Now measure the circumference of the rim.
Using that thought as a reference, and my measurements for simplicity, it goes like this. If you rotate the tire alone one revolution it's going to go 48 inches. If you rotate the rim one complete revolution it's going to go 24 inches. If you push the tractor forward on the tire it will go 48 inches, on the rims it will go 24 inches, each distance in just one revolution.
Now, with nothing about the situation changed in regard to the diameter of the tire or rim, physically put the two together. Now, the tractor will move 48 inches forward for one complete revolution of both the rim, and the tire.
That said, the example you use is why a planetary gearbox works. Basically you can attach a 48 tooth gear to a 24 tooth gear. With the two gears together you then input power to the 48 tooth gear, and let the 24 tooth gear be the output, driving the device. The resulting output is 1/2 the input speed, with twice the torque.
The only way this could be possible is for the two gears to be attached together and to make one revolution TOGETHER while the actual circumference on one moves at twice/half the speed of the other one.
I really don't know how else to explain it, but really think about the two examples and you'll understand what I am saying.
We sell tractor parts! We have the parts you need to repair your tractor - the right parts. Our low prices and years of research make us your best choice when you need parts. Shop Online Today. [ About Us ]
Today's Featured Article - The 8N and the Fox - by Zane Sherman. Dec. 13 1998, Renfroe, Alabama. Last niht I dreamed about the day that I plowed the field of about 10 acres over on what Jimmy and Dandy called the Ledbetter field. I was driving the 1948 8N Ford tractor that Jimmy bought in 48 new This was prebably in about 1951 and maybe even befor the house was built. This would have made me to be about16 years old and I drove the tractor for nothing and would have paid to drive it if I had had any money which I didn't, but neit
... [Read Article]
Latest Ad:
Sell 1958 Hi-Altitude Massey Fergerson tractor, original condition. three point hitch pto engine, Runs well, photos available upon request
[More Ads]
All Rights Reserved. Reproduction of any part of this website, including design and content, without written permission is strictly prohibited. Trade Marks and Trade Names contained and used in this Website are those of others, and are used in this Website in a descriptive sense to refer to the products of others. Use of this Web site constitutes acceptance of our User Agreement and Privacy Policy
TRADEMARK DISCLAIMER: Tradenames and Trademarks referred to within Yesterday's Tractor Co. products and within the Yesterday's Tractor Co. websites are the property of their respective trademark holders. None of these trademark holders are affiliated with Yesterday's Tractor Co., our products, or our website nor are we sponsored by them. John Deere and its logos are the registered trademarks of the John Deere Corporation. Agco, Agco Allis, White, Massey Ferguson and their logos are the registered trademarks of AGCO Corporation. Case, Case-IH, Farmall, International Harvester, New Holland and their logos are registered trademarks of CNH Global N.V.