2006-07-18 14:14:25 · 8 answers · asked by saran s 1 in Science & Mathematics ➔ Physics
It's got nothing to do with torque. In fact, changing the diameter of a wheel has no effect on torque, since it is a measure of rotational force. It will however affect gear ratios.
The real reason is that a tractor is very heavy, and the soil on a farm can be very soft. They need the weight of the tractor spread over the greatest surface area possible, so it doesn't sink into the dirt (much like a snowshoe works).
Having a larger wheel also allows for deeper treads, which can grip the dirt better (since dirt is soft and easy to move).
2006-07-18 14:29:57 · answer #1 · answered by jsprplc2006 4 · 0⤊ 0⤋
enormous tires to diminish the floor rigidity. once you've distinctive rubber they don't sink into the floor and get stuck. you do not %. the floor down as a lot both. a wide diameter wheel also rolls over small stumbling blocks and holes like plough furrows quite. even as a tractor is operating authentic each and each and every of the burden is on the rear wheels. now and again even as a tractor is being worked too not basic you'll see the front wheels actual lifting off the floor
2016-12-01 21:21:12 · answer #2 · answered by ? 4 · 0⤊ 0⤋
it is a matter of torque
although bigger wheels do help with rough terrain, the front wheels of a tractor are not nearly so big and they would be subject to getting stuck in rough terrain
the big back wheel is like a low gear, it delivers high torque and low rpm's (think about how the front wheels must go around lots of times each time the back wheel goes around once)
a large back wheel means more push and pull power at the same shaft speed
2006-07-18 14:25:14 · answer #3 · answered by enginerd 6 · 0⤊ 0⤋
To help push it through the mud. Gotta remember, a lot of the work done in the fields during the spring is in mud. Not fun trying to get a tractor out when it's stuck.
2006-07-18 14:19:48 · answer #4 · answered by Dagblastit 4 · 0⤊ 0⤋
Torque and the convince of power to the ground, the smaller in diameter of a tire, the smaller the "sin", area of contact to the ground. This is the area of traction, the second advantage is gear reduction, the greater the reduction gear out of the engine, the more torque delivered to the rear axle, at a lower rpm. The third advantage is able to travel over irregularities in the ground. it is able to more easily travel over small humps and ditch's.
2006-07-18 14:24:30 · answer #5 · answered by brp_13 4 · 0⤊ 0⤋
mainly so they can go over rough terrain - small wheels get trapped more easily
2006-07-18 14:18:14 · answer #6 · answered by Ivanhoe Fats 6 · 0⤊ 0⤋
So it gets a lot of traction.
2006-07-18 14:18:38 · answer #7 · answered by Mojo Seeker Of Knowlege 7 · 0⤊ 0⤋
to have more power in the soft field where it is purposed to work
2006-07-18 14:34:48 · answer #8 · answered by phi071237 6 · 0⤊ 0⤋