Why do buses start in second gear, why medium and large buses, use second gear to start

Because the diesel engine is used and the gear ratio of the vehicle itself is designed, in order to ensure the safety of various working conditions (such as the bad road conditions such as the truck is full or even overloaded, or even overloaded, climbing and starting), a gear with more torque is reserved for starting.

Therefore, the first gear is also commonly known as the climbing gear, which ensures that the car can have enough power to start and ensure that it does not turn off in the case of full load or even overload.

First gear. The starting gear, the starting gear of the car. The performance is basically the same as that of the reverse gear, so it is not suitable for continuous high-speed operation. Generally, after the inertia of the vehicle movement, it can be shifted into second gear.

Second gear. Through the gear, it is mainly used to pass through complex road surfaces and deal with complex situations, such as through acute (right-angle) curves without special obstacles, **dense and prosperous road sections, road sections with large slopes, and pothole road sections.

Three gears. Transition gear, mainly used for low-speed driving in urban roads, depending on the situation, acceleration can be easily transitioned to fourth gear, deceleration can be easily reduced to second gear.

Fourth gear. Driving gear, mainly used for a long period of high-speed driving, economic driving, the most economical speed of most vehicles will appear in the low speed section of the fourth gear.

Fifth gear. High-speed gear, mainly used for long-distance driving on highways.

Medium and large vehicles, such as Iveco.

The slightly larger Jinbei, as well as most trucks, trucks and other vehicles, basically use 2nd gear when starting on flat ground and non-maximum load, because they use diesel engines.

As well as the design of the gear ratio of the vehicle itself, in order to ensure the safety of various working conditions (such as the truck is full or even overloaded, or even overloaded in the case of climbing and starting these bad road conditions), a gear with greater torque is reserved to start, so the first gear is also commonly known as the climbing gear, to ensure that in the case of full load or even overload, the car can have enough power to start and ensure that it does not turn off.

Generally, diesel vehicles start in second gear, especially buses and large trucks.

It is not necessary to start in second gear, mainly because drivers are used to starting in second gear, so that the speed can be faster if you change one gear.

The reason why the second gear starts is because the diesel engine has high power and low speed, so it can start at a high level. The rev speed is low, the start is slow, and you have to change to second gear just after the first gear, which is a bit troublesome.

Because the purpose of a motor bus is to carry passengers, it does not tend to accelerate like a trolley gearbox. It is necessary to reserve a gear for heavy load climbing, so the general flat road starts in second gear.

Large passenger cars refer to passenger cars that are longer than 6 meters, and the transportation distance of large buses is as much as hundreds of kilometers, and some compartments are all equipped with seats; Some of them all have bunks, so they are commonly known as "sleeper cars", and there are luggage for storing passengers' carry-on luggage.

In 2010, the cumulative sales of large and medium-sized buses reached 143372, a year-on-year increase; Large buses and medium-sized buses are growing.

Among them, the top 15 enterprises sold a total of 116008 large and medium-sized buses, accounting for the total sales of large and medium-sized buses, an increase of one percentage point over the same period last year; The sales volume of the top 15 large buses totaled 63,332 units, accounting for the proportion of total sales of large buses, and the sales volume of the top 15 medium-sized buses was 61,458 units, accounting for the proportion of total sales of medium-sized buses.

Technological development:

Diesel cars can start in second gear, because the diesel engine has a large torque, and the start is effortless.

This problem is very simple, your car starts in first gear, and the driver's car starts in second gear. My own 55-seat Yutong is a first-gear start.

Now the bus is a high-speed gearbox, can not use the second gear to start, can only use the first gear, otherwise the gearbox in the main shaft second gear teeth will often move the teeth, the clutch disc and clutch plate will also cause different degrees of damage.

Today's buses can start in second gear, but this will accelerate the wear of the clutch and reduce the service life. The advantage is that the labor intensity of the driver is reduced, and the starting speed of the vehicle is improved, so the drivers like to start in second gear. Due to the different uses of buses and highway buses, the speed ratio of the chassis transmission design is different, the speed ratio of the bus is large, the speed is slow, and the output torque is large, so there is no problem at all with the second gear.

In addition, the empty weight of 12-meter buses is basically about 12 tons.

That's an interesting title! There is no requirement that you must start in second gear, and if you drive a tourist bus, how many gears you use to start depends entirely on whether it is empty or the road environment when you start.

Now the bus is equipped with a high-speed gearbox, can not start with the second gear, can only use the first gear, otherwise the second gear of the spindle in the gearbox will often move the gear, the clutch disc and the clutch plate will also cause different degrees of damage. More than 10 years of experience in bus driving!

The low-speed engine gearbox only starts in second gear, and the old toothsticks that were driven in the driving school twenty years ago are all started in second gear, and now they are all high-speed engines with second-gear starting clutch plates.

Except for the ignition start, I started in first gear, and other times like stopping in traffic jams, traffic lights, etc., I started in second gear.

Answer: The body size of the bus is long, the bearing capacity is strong, the traction is strong, the body is heavy, the engine power is increased, and the gearbox gear is "double gear" from 2 gears to 4 gears, 6 gears, 8 gears, 10 gears, 12 gears

The engine and gearbox equipped with the tourist model and the commuter model are not the same, and the same six-gear 100 miles engine speed difference is five or six hundred rpm, and the high-speed car must be in one gear, and the idle start without refueling is all provincial

The large cargo has been driven through nine into one reverse, not counting half the front gear, are three gears, sometimes do not want to shift gears on five gears, heavy overload one gear, standard load two gears

The bus test is the second gear test, including the uphill start, and the first gear only has a full load steep slope.

Buses equipped with high-horsepower engines must start in first gear. Because of the high horsepower at high speed, in order to save fuel, the transmission ratio of the final reducer is very small, 1100 rpm is 100, and the second gear is very fast. Clutch plates can easily break.

Although many cars are equipped with imported saxophone clutches, they can't afford to toss. The 12-meter tourist car can drive more than 500,000 kilometers with the clutch plate in first gear. The transmission ratio of ordinary trucks is much larger, the second gear is not as fast as the first gear of the bus, the start is very easy, and the heavy vehicle is no problem on the flat road.

I drove a large cargo semi-trailer before overloading when pulling fifty or sixty tons when the first gear started, if the standard ton is less than thirty-two tons, it is the second gear start, unless the first gear is used on the muddy road. At that time, I drove a 336 horsepower Auman car.

In fact, no matter what the car, no matter what state, the next gear is the best, because when the starting force is large, the start is fast, the time is short, the linkage time is short, and the wear and tear on the clutch is smaller.

When to start in second gear depends on the situation. The large passenger car does not carry more than a third of the full load, and there is no problem with starting in second gear. But in the case of a full load, it must be in one gear. Reduces wear on clutch plates. The same goes for vans.

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