Classification and principle of tractor


Tractor is a common vehicle in our life. It is mainly a self-propelled power machine used to pull and drive working machinery to complete various mobile operations. Tractors are generally used in agriculture. Of course, there are also industrial and special-purpose tractors. How are tractors classified? What is the principle of tractors? Today, MANHOPE Xiaobian will explain the knowledge of agricultural tractors.

Tractor principle and components:

The ability to drive depends on the power of the internal combustion engine through the transmission system, so that the driving wheel obtains the driving torque Mk, and the driving wheel that obtains the driving torque then gives the ground a small, backward horizontal force (tangential force) through the tire pattern and the tire surface, while the ground For the horizontal force Pk that is equal in magnitude and opposite in direction to the driving force, this Pk force is the driving force that pushes the tractor forward (also known as the propulsion force). When the driving force Pk is sufficient to overcome the forward rolling resistance of the front and rear wheels and the traction resistance of the agricultural implements, the tractor will move forward. It can be seen that the driving of wheeled tractors is realized by the interaction between the driving torque and the driving wheel and the ground, and the driving force is greater than the sum of rolling resistance and traction resistance.

Tractor Composition:

a. Engine: It is the device that generates power for the tractor. Its function is to convert the thermal energy of the fuel into mechanical energy and output power.

b. Chassis: It is the device for the tractor to transmit power. Its function is to transmit the power of the engine to the driving wheels and the working device to make the tractor drive, and complete the mobile operation or fixed action.

c. Electrical equipment: it is a device to ensure the power consumption of the tractor. Its role is to solve lighting, safety signals and engine starting.

Picture:MH-EN1054 Garden Tractor

Tractor classification:

1. Classified by purpose:

a. Industrial tractors: mainly used in road construction, mining, water conservancy, petroleum and construction projects, and can also be used for farmland capital construction operations.

b. Forestry tractor: It is mainly used for wood skidding in forest areas, that is, to collect and transport the felled wood to forest farms.

c. Agricultural tractor: Tractor is the main power machine in agricultural mechanized production. It can be equipped with different operating machines to complete plowing, harrowing, sowing, harvesting, intertillage, irrigation and drainage, fertilization, spraying, agricultural and sideline product processing, ditching, digging, Operations such as pushing and transporting.

2. Classified by walking device:

a. Crawler tractor [also called chain-track tractor]: the walking device of the belt-covered tractor is a crawler, which is mainly suitable for field operations in heavy soil and wet land, farmland water conservancy, earthwork and other farmland basic construction work

b. Walking tractor: It has only one walking axle. For example, a tractor with only one wheel on the axle is called a one-wheel tractor, and a tractor with two wheels is called a two-wheel tractor.

c. Wheeled tractor: It has two walking axles. If there are three wheels on the axle, it is called a three-wheel tractor. If it has four wheels, it is called a four-wheel tractor. The wheeled tractors we usually refer to refer to the two types of tractors with two axles and two wheels and four wheels.

3. Classification of agricultural tractors:

a. Ordinary tractor: mainly used for farmland mobile operations, fixed operations and transportation operations under general conditions

b. Cultivation tractor: It is characterized by a large tractor ground clearance (generally above 630 mm) and narrow tires.

c. Gardening tractor: It is characterized by small size, flexible maneuverability and low power, such as walking tractors and small four tractors.

d. Special-type tractors are suitable for working in special working environments or meeting certain special needs.

4. Classified by power:

a. Large tractors: with a power of 73.6kw (100hp) or more

b. Medium-sized tractor: power is 14.7 ~ 73.6 kW (20 ~ 100hp)

c. Small tractors: less than 14.7 kW (20 hp)

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