why tractor will have bigger rear wheels & in front smaller wheels?

Question

What is the importance of design
Technical significance
And also in all vechicles(bikes) why we have disc bracks only on front the wheel.
1) Answer should be technically sound

Thank u

Answer 1

When a tractor (or drag racer) starts pulling, the torque of the rear wheels turning forward causes and equal and opposite reaction of twisting the tractor (or dragster) body in the opposite direction. You can clearly see this as the front end of the dragster raises up in the air as the rear wheels spin forward. Since weight is shifted off the front wheels to the rear, having big front wheels does not help the traction. So in both, they put big wheels on the rear and small wheels on the front. When it comes time to stop, the weight shifts to the front so having the better brakes on the front wheels is more efficient. You can see this as a car stops and the nose dives towards the ground. Disk brakes were originally only on the front of cars, but now many have four wheel disk brakes, but the front still most of the work.

Answer 2

This isn't always true, because there are many tractors (mostly 4WD) which their front wheels diameter is the same as the rear wheels (like most of Valtra tractors).
Mainly tractors are used for traction and traction needs torque and that torque is needed at the drive axis which is mostly the rear axis. So there's no need for the front wheels to be very big which has many disadvantages (like steering difficulties and soil compacting).

Answer 3

The tractor has large wheels on the back for traction and to carry the weight of heavy implements, plows, cultivators and a larger surface area which helps to prevent sinking in soft soil and mud. Small wheels on the front for steering.
Disc brakes can't be locked for parking, so they work really well on the front, but band brakes can be set by lever lock on inclines for parking. Also, about 90% of the braking power is on the front brakes, more weight and more tire traction.

Answer 4

A tractor is a device intended for drawing, towing, pushing or pulling something which cannot propel itself and, often, powering it too. Most commonly the word is used to describe a vehicle intended for pulling some other vehicle or object.

In Britain and India the word "tractor" usually means "farm tractor", and the use of the word "tractor" to mean other types of vehicles is familiar to the vehicle trade but unfamiliar to much of the general public. In Canada and the US the word is also used to refer to a road tractor .

The word comes from the Latin trahere "to pull". A conflicting history of the name suggests that steam tractors were originally referred to as traction engines, with the word "tractor" eventually deriving from a contraction of 'traction' and 'motor'.

Answer 5

The back wheels are larger on commercial vehicles because that's where the majority of the load is held. The wheels need to be largers to hold the payload.

Disc brakes are used because they offer better performance than drum brakes. They don't overheat as easily and they recover better from exposure to water. Wear is also even on disc brakes since the same pressure is applied to all of the pads.

Answer 6

Tractors have larger rear wheels because, a tractor motor creates high amounts of torque and weighs multiple tons. for the rear tires to spin at a steady speeds and not spin out and dig into the earth they have to have a much larger diameter. as for disk breaks they create an even amount of pressure to stop slower if you were to slam on your breaks you would not want your front tires to lock up. that would make you spin out and probably die. Drum breaks offer much more stopping power but do tend to lock up easily.

Answer 7

becuse when the forewheels were big then you couldnt sit in the tractor, you would fall backwards. So it is for safety reasons that the back wheels are bigger.

the breaks are on the frontwheels because that is easier to manufacture.

Answer 8

i think because of the conditions where they work, like loose soil, mud. Small wheels would be more efficient but they can get stucked easy in the mud.