Low-tonnage medium-duty trucks can be matched with four-cylinder diesel engines, and the price advantage is obvious, and the price-performance ratio is obviously better than that of high-tonnage medium-duty the truck. Its flexibility, convenience, and economical cargo capacity and cargo space are very suitable for urban logistics. From the perspective of future development, low-tonnage medium-duty trucks will also obtain permits for urban operation at the right time, while high-tonnage medium-duty trucks are expected to be excluded.
This trend has started to show, mainly due to the inefficiency of trucking in these categories. The future outlet for these models will turn to the special-purpose vehicle sector, but there will be major changes in configuration, such as the power level of the engine will be increased, and the axles and gearbox will also be changed and adjusted accordingly.
Diesel engines above 11 liters will be the products of multinational brands in joint ventures and cooperation, and one of the main driving forces for heavy-duty trucks. Its market size depends on the market demand of high-end trucks, as well as its own cost level. The domestic 8-9 liter 6-cylinder diesel has the opportunity to achieve simultaneous growth with high-tonnage heavy-duty trucks, but the production capacity of each product is the biggest obstacle to its market development. Four-cylinder diesel engines below 200 horsepower, which are mainly matched with low-tonnage heavy-duty trucks, will also be rapidly developed. At the same time, the market for the 7-liter 6-cylinder diesel engine will gradually shrink, and its market dominance will cease to exist.
With the diversification of user needs, heavy truck products will develop in a multi-grade direction, which directly leads to an increase in the type and quantity of vehicle parts, and the self-weight of the vehicle will increase accordingly; Damage to the road, improving the technical content of heavy-duty trucks, etc.) will formulate heavy-duty truck standards, increase the number of axles of the vehicle, and apply new technologies or components, which also increases the weight of the vehicle.
operating principle
The truck consists of four parts: engine, chassis, body and electrical system. The operation of the truck is mainly driven by the engine and the chassis, where the chassis includes the drive train, the driving train, the steering train and the brake train.
Operating principle of the truck: When we start the car, the engine will generate power and transmit the power to the gearbox. The power passes through the gears in the gearbox to convert the high-speed and small-torque power into low-speed and high-torque power, and then transmit the power to the transmission through the transmission shaft. The rear axle is driven, and the driven rear axle drives the driven rear wheels to rotate, so a car moves.
The functions and main components of each part:
Transmission: The power of the engine is transmitted to the driving wheels, mainly including the clutch, gearbox, transmission shaft, and drive axle.
Driving system: connect the various assemblies and components of the car into a whole and support the whole car to ensure the normal driving of the car. Mainly including frame, front axle, wheels, suspension.
Steering system: To ensure that the car can drive in the direction selected by the driver during the driving process, mainly including steering control mechanism, steering gear, and steering transmission device.
Braking system: to decelerate, stop and ensure reliable parking of the car. It mainly includes brake control mechanism, brake and transmission device.
New car maintenance needs to be done. Most car owners will go to the special service station for maintenance in accordance with the manufacturer’s regulations when the first warranty period is reached, because most car manufacturers have implemented the first warranty free oil change discount for new cars. For example, Shanghai GM will provide 4 free oil and oil filter replacement services during the quality guarantee period. But there are also a small number of car owners who neither consult the staff nor read the “Maintenance Manual”, so there are also examples of missing the first insurance. Since it is a new car, if the owner misses the first insurance, it will only cause the oil to turn black and dirty, which will not cause any serious consequences. However, experts suggest that car owners should do the first insurance, because the truck is in a running-in state and the mechanical parts are running in, and the demand for lubricating oil will be relatively high. This is the meaning of first insurance.
4-60,000 kilometers to replace the brake pads is relatively speaking, the second guarantee is very important. The project involves the inspection and maintenance of up to 63 items in eight major parts, including engine, automatic transmission, air-conditioning system, steering system, braking system, suspension system, body part, and tires. In addition, it also includes quality inspection and test drive. It can be seen that after the car has undergone so many tests and maintenance, the entire car condition will obviously enter the best state, and the safety of driving can be best guaranteed.
(1) Brake pads
Generally speaking, the brake pads should be replaced when the vehicle travels to 40,000-60,000 kilometers. For owners with poor driving habits, the replacement trip will be shortened accordingly. If the car owner sees the red light ahead, instead of collecting fuel, refueling, and then adopting the method of dragging the brakes and waiting for the green light to release, it belongs to such a habit. In addition, if the main car is not maintained, it is impossible to detect in time that the brake pads are thin or completely worn. If the worn brake pads are not replaced in time, the braking force of the vehicle will gradually decrease, threatening the safety of the car owner, and the brake disc will also be worn out, and the maintenance cost of the car owner will increase accordingly. Taking Buick as an example, if the brake pads are replaced, the cost is only 563 yuan, but if even the brake disc is damaged, the overall cost will reach 1081 yuan.
(2) Tire rotation
Note that one of the tire maintenance items of the tire wear symbol is tire rotation. When using a spare tire in an emergency, the owner should replace it with a standard tire as soon as possible. Because of this particularity of the spare tire, Buick does not use the method of cyclic transposition between the spare tire and the tire of other models, but the four tires are transposed diagonally. The purpose is to make the tire wear more even and prolong its service life. In addition, tire maintenance items also include adjusting the air pressure. For tire pressure, car owners can not take it lightly. If the tire pressure is too high, it is easy to wear the middle of the tread. It is worth reminding that it is difficult for car owners to accurately measure the tire pressure without relying on the air pressure gauge. The daily use of tires also requires some details. For example, pay attention to the distance between the tread pattern and the wear mark. Generally speaking, if the distance is within 2-3mm, a new tire should be replaced. Another example, if the tire is punctured, if it is on the sidewall, the owner must not listen to the advice of the quick repair shop to repair the tire, but should change the tire immediately, otherwise the consequences will be very serious. Because the sidewall is very thin, it will not be able to withstand the weight of the car after repairing, and it is prone to blowout.
