The automatic transmission is filled with oil, so why not let neutral coast?

When the automatic car is coasting in neutral gear, the transmission oil cannot be circulated and cooled by the oil pump, and the oil pump cannot supply oil normally. However, at this time the transmission continued to work, but the oil supply system lost the oil supply and forced lubrication to the transmission, and the transmission temperature would rise for a long time, which was caused by damage to the transmission. Automatic transmissions are forbidden to slide in neutral, because during high-speed idling, the "planetary gear set" will most likely not be able to get enough lubricating oil from the oil pump, resulting in insufficient lubrication capacity of the planetary gear set and the possibility of excessive wear!

But more often than not, tens of thousands of self-parking cars that often coast in neutral may not have this problem! Even when the automatic transmission is in neutral, the oil pump continues to work. Theoretically, the oil supply to the planetary gear set is completely sufficient, but "probably" is not enough.

Therefore, in order to avoid risks, manufacturers often indicate in the manual that "n-gear sliding is prohibited"! There are a number of factors that prevent an automatic transmission from sliding in neutral. The power transmission of the automatic transmission is provided by hydraulic oil.

Neutral slippage and prolonged traction can cause the drive shaft to transmit a reverse force to push the torque converter, which changes the direction of oil pressure (at which point the engine stops), resulting in damage to the torque converter blades and turbulence in the hydraulic oil, leading to valve body failure. In fact, as long as it's not a high load and long idle gliding, it's fine! If the slope is greater than or longer than the slope below, there is a small possibility that the planetary gear set will be underlubricated due to a long slippage in the nth gear, but the nth gear slides a few tens of meters before the medium signal in everyday life is completely harmless!

The small probability of the above fuel shortage** is only a small probability that will only occur when coasting in neutral at speeds above 120 km/h (km/h), so there will be no problems when taxiing at low speeds and short distances under normal conditions! Due to the use of automatic transmission, its structure is mainly composed of torque converter, planetary gears, clutch and brakes. Hydraulic control is done by combining and disengaging different clutches and brakes.

The gearbox generates a lot of heat during operation. At this point, the transmission oil will play the role of cooling the gearbox. An oil pump connected to the torque converter provides forced lubrication to the gearbox.

If the gearbox is switched to neutral at this point, the gearbox is still running, the engine is idling, and the parts connected to the gearbox are running at low speeds. At this time, the transmission oil pump is also in a low-speed operation state, and the oil pressure is insufficient or there is no oil pressure at all, which will slow down the transmission oil circulation and reduce the lubrication effect of the transmission.

This is due to the fact that coasting in neutral is a very dangerous behavior, and not being able to control the car in time may lead to traffic accidents.

Because the engine stops running in neutral, the air compressor does not work, which may cause brake failure.

The main reason is that the handling of the car will deteriorate when coasting in neutral gear, which is easy to cause accidents.

Summary. Hello, the automatic transmission will have a neutral gear during driving, what is the reason? This may not be the neutral you are talking about, it may be a problem caused by the slippage of the clutch plates, and it may be the idling caused by the slippage of the clutch plates inside the gearbox, which is caused by the failure.

Hello, I'm helping you sort out the answers to your questions, please wait a moment

Hello, what is the reason why the automatic transmission will have a wild and simple neutral gear during driving? It is possible that this is the neutral gear you are talking about, it may be a problem caused by the slippage of the clutch plates, and it may be the idling caused by the slippage of the clutch plates inside the gearbox, which is caused by the failure.

Suddenly it was out of gear, and the revs were very high.

That's right, this kind of situation in Duanzhou may be a problem caused by slippage in the grip of the finch fitter, here are all gearboxes, there are internal problems, and this gearbox needs to be repaired.

It's good to slow down.

So this is about repairing the gearbox.

There is no fault prompt, and the computer can't find out what the reason is.

This is going to repair the gearbox, be cautious, and don't Chang Zijing go directly into the gearbox system to see if there is a collapse fault? If there is no fault, you need to remove the gearbox and disassemble it to see how worn the clutch plates are inside.

Overtaking and stepping on the accelerator to slow down immediately, does it have anything to do with this in a few seconds?

The relationship is there, if you need to remove it to check it, or you can clean the throttle first, and look at the dirty throttle, Tong Qi, and it will also dismantle the wheel rock to have this kind of problem.

The throttle was cleaned, the oil, spark plugs, and ignition coils were replaced.

Then there are more problems with the gearbox. There are many internal problems.

What are the consequences if you don't lift the gearbox for the time being?

If you don't lift the gearbox for maintenance, such as the frequency of acorn failures is high, this will cause more and more damage to the gearbox, you can also check whether the gearbox beam is too dirty to replace the gearbox oil.

If I can help you, please give me a thumbs up Thank you!

There are many riders who know that the automatic transmission can't be attached to the N gear coasting, but few people know the reason why the automatic transmission can't be attached to the N gear coasting.

There is transmission oil and some hydraulic mechanisms in the automatic transmission, if the N gear is hung when driving, the oil pressure will be reduced, which will affect the circulation of transmission oil in the gearbox, which will lead to poor lubrication and poor heat dissipation problems in the gearbox.

If you coast in Nth gear for a long time, it may directly burn the gearbox.

There is transmission oil in the automatic transmission, and for the manual transmission, the transmission oil plays the role of lubrication and heat dissipation. For automatic transmissions, transmission oil plays a role in lubrication, heat dissipation, and power transmission.

There are shift control mechanisms in the automatic transmission, and these shift control mechanisms need to have transmission oil to work properly, otherwise the gearbox will not be able to shift normally.

If the gearbox is put into N gear while driving, the engine speed will return to the speed at idle, which is about 800 rpm when the engine is idling.

If there is a car in front of you that needs to be overtaken, then the speed of the engine does not match the current driving ignition speed, if the D gear is hung at this time, it will damage the gearbox, because the speed difference between the engine flywheel and the gearbox input shaft is too large, so that the gearbox will be subjected to a relatively large impact.

Coasting in N gear while driving will also affect driving safety.

It has been said above that the speed of the engine after the N gear is hooked is about the same as the speed at idling, if there is an emergency in front of you that you need power, then it takes a long time to increase the speed of the car when you step on the accelerator and wait for the engine to rise in D gear, which may cause a traffic accident.

Therefore, it is recommended that all riders do not slide in N gear when driving, which has no benefit to the gearbox and will also affect driving safety.

When driving, it is enough to engage in D gear. Beixun @2019

When the automatic transmission car slides in neutral gear, the transmission oil can not be cooled by the oil pump, and the oil pump can not supply oil normally, but the gearbox at this time still continues to run, but the oil supply system is lost to force the gearbox to lubricate the oil, and the temperature of the gearbox will rise for a long time, which is seriously caused by the damage to the gearbox.

The drive of the transmission oil pump is different from the transmission, the transmission energy comes from the torque converter, and the full torque output of the engine may not be obtained at low engine speedsThe oil pump is rigidly connected directly to the engineEven in the idle state, it can still ensure sufficient oil pump pressure supply to the transmission.

Almost all automatic transmissions are inseparable from the hydraulic mechanism when they are in gear. For example, the name of the automatic transmission, which is called "hydraulic automatic transmission", needs to be driven by hydraulic clutch and brake friction pads to switch and maintain gears. Moreover, the torque converter between the engine and the gearbox should also be transmitted when the gear is in the gear, and the torque converter is not locked when the speed is not high, and the oil inside participates in the transmission of relatively large strength, and the oil temperature of the gearbox rises faster than that in neutral gear.

Not to mention the CVT gearbox, where the two large conical wheels must be tightly clamped under the action of oil pressure, and the slightest negligence can be an instant lightning slippage.

Not to mention the dual-clutch gearbox, which requires a hydraulic actuation clutch when in gear, and frequent gear changes also increase the temperature of the clutch.

It can be seen that no matter what kind of automatic transmission, it must be switched and torque controlled accordingly when it is in gear, and its control without exception requires the transmission oil pump to provide enough oil pressure to drive, and these parts can take a breath when you hang in neutral, so from this aspect, hanging neutral is the most relaxed state of the gearbox.

Regardless of the form of energy, what cannot be efficiently converted will eventually be consumed in the form of heat (conduction, convection, radiation).

The main reason for the prohibition of coasting in neutral gear is that from high to low speed, from high to low, affected by inertia and potential energy, converted into kinetic energy, the vehicle can maintain or accelerate the movement with lower consumption. However, if you slide for a long time, through a single braking, the brake will overheat and affect the braking performance, resulting in a situation where you can't brake. When in D gear or low gear, the engine transmission can intervene to "drag the body" to avoid accidents caused by continuous acceleration and brake failure.

Especially in mountainous areas, it is strictly forbidden to slide in neutral.

I think the reason why a car with an automatic transmission and gearbox can't coast in neutral is because there is a high risk of some wear and tear on the interior parts of the body during the neutral coasting process.

The main reason is that in the process of high-speed driving, the temperature of the transmission oil will be very high, so the transmission oil pump needs to circulate the oil to reduce the oil temperature of the transmission, and when the high-speed driving neutral slide, the oil pump pressure is insufficient in the idle state, and the heat of the transmission oil can not be discharged in time, which may cause the problem of transmission damage.

Because of the lack of lubrication of the gearbox caused by neutral coasting, the gearbox is worn, and the life of the gearbox is overdrawn in advance, which is very bad for the use of the car.

Bad driving habits will affect the service life of the car, for the engine and gearbox will also cause certain damage, under normal circumstances, it is not possible to use n gear coasting, which can also reduce the probability of transmission damage, occasionally using neutral coasting will not have much problem, but high-load neutral coasting or long-distance neutral coasting, will be easy to damage the parts in the gearbox, do not choose to use neutral coasting downhill.

The automatic transmission neutral keeps coasting, and the gearbox will be affected, which will affect the heat dissipation of the gearbox, and in severe cases, it may cause the gearbox to burn out.

This behavior will definitely be affected, and this behavior will lead to a decrease in oil pressure, which will seriously affect the heat dissipation of the gearbox.

will be affected; Coasting in neutral will cause the oil pressure in the transmission to decrease, which will have a certain impact on the lubrication and heat dissipation of the transmission, and if it lasts too long, it will also cause the transmission to burn out.

Pacific Automobile Network] Yugao automatic transmission neutral gear coasting is harmful to the car, because when switching to neutral gear, the gearbox does not supply oil, but the gearbox is still moving, so in the absence of oil lubrication, it will accelerate the wear of the gearbox, so the automatic transmission prohibits neutral sliding.

Cars with automatic transmission cannot coast in neutral gear. Modern cars are computer-controlled fuel injection, if the car relaxes the accelerator pedal degree during the coasting process, the engine speed exceeds the idle speed, the computer will automatically cut off the fuel, and the car is as fuel-efficient. If the neutral coasting version, the engine is running at an idle foot speed, but it consumes fuel.

In addition, the automatic transmission car is lubricated by oil pressure. Neutral coasting is established without the right to start the oil pressure. The gearbox burns out easily.

Similarly, when the automatic transmission fails, it cannot be towed for long distances.

Neutral coasting refers to: in the motor vehicle driving, the driver puts the gear lever in the neutral position, so that the engine is separated from the recovery orange clutch of the driving wheel, and the operation method of using the vehicle inertia to drive. Neutral coasting must be carried out under the condition of ensuring safety and normal technical condition of the vehicle, and it is not allowed to turn off the ignition and slide, especially when descending a steep slope or a long slope, it is not allowed to turn off the ignition or slide in neutral.

Photo by Tang Yanyan of Pacific Automobile Network).

The neutral coasting transmission is still working. Neutral coasting refers to the operation method of using the inertia of the vehicle to drive the vehicle by placing the gear lever in the neutral position, separating the engine from the clutch of the driving wheel. Here are the drawbacks of coasting in neutral:

1. Coasting in neutral gear may damage the automatic transmission. When coasting in neutral gear, due to the difference between the driving speed of the car and the engine speed, the friction will be increased, the lubrication effect will be reduced, and the wear of the friction plate inside the automatic gearbox will also be accelerated. 2. Neutral sliding is not conducive to engine braking, and the vehicle may shift unevenly. The automatic transmission is basically computer-controlled, because when the transmission matches the data, the neutral coasting may cause rough gearing, resulting in uneven shifting; 3. Coasting in neutral gear is not necessarily fuel-efficient, but fuel-efficient, and vehicle skiddling may occur.

The neutral sliding wheels will continue to drive the turbine to agitate the automatic transmission oil at high speed, and the automatic transmission oil pump will stop working because of the gear, and all the components in the transmission will not get any heat dissipation, which will cause damage to the internal parts of the automatic transmission, and the vehicle will slip and other fault phenomena.