Why are some full time four wheel drive cars not equipped with a mid difference lock?

First of all, let me briefly tell you what is the differential lock, the differential lock is actually a locking mechanism installed on the differential, used in four-wheel drive models, its role is mainly to improve the passability of the car on the road, for example, when a drive axle of the car idles, it can quickly lock the differential, and transmit most of the twist to the drive wheel that does not idle, so that he can tow the car forward with the maximum power. We often see some SUVs or sedans on the road, although many of them are full-time four-wheel drive models, but they generally do not add differential locks, of course, it is not excluded that many models are equipped with differential locks.

Many people may have a bit of confusion about the understanding of this differential and differential lock, the differential refers to when the car turns, if the speed of the left and right wheels is inconsistent, at this time it must be the two wheels directly produce the speed difference, otherwise the car can not turn, the role of the differential is to make the two wheels produce a speed difference. The differential part also has shortcomings, for example, when a certain drive wheel of the car slips, even if the grip of other wheels is particularly good, it can not have enough power to get out of trouble to a large extent.

The main function of full-time four-wheel drive is to increase the stability of the car in high-speed driving, if there is a wheel slippage, the other wheels can operate independently, still push the car forward, keep the car has good passability and stability, the wheel slippage said by appeal will lose power significantly, largely because of the cost saving reasons, so some cars have added the function of electronic limited slip to help get out of trouble. Due to the poor durability and lack of strength of this function, this differential lock was developed to prevent the loss of power and enhance passability!

Therefore, the full-time four-wheel drive that often runs in the city generally does not have a differential lock, and some off-road full-time four-wheel drive models generally have it.

Although many of them are full-time four-wheel drive models, they generally do not have differential locks, and of course, it is not excluded that many models are equipped with differential locks.

The mid-difference lock is not necessary for full-time four-wheel drive cars, and this can mainly reduce costs.

Because some full-time four-wheel drive cars are not equipped with a mid-difference lock, it is not necessary to save costs.

The full-time four-wheel drive equipped with electronic limited slip is fully capable of most road conditions, so there is no need to add extra.

This full-time 4WD doesn't need such a setup, because it can be done with 4WD performance.

It should be designed like this, if you want to reduce costs, and the mid-difference lock is not necessary to be configured.

Because it does not require a neutral lock, it has another lock that replaces the neutral lock, which reduces the cost.

Maybe it's the design, but it's not configured. It may also be for cost savings.

Maybe it's to reduce the cost.

This is probably to save costs, but that's what I think anyway.

We often say that to see whether a car has real off-road performance, in addition to seeing whether it has four-wheel drive, is to see whether it has the best differential lock.

First, first of all, we all know that when the car is turning, the rotation trajectory of the front and rear wheels is different.

Therefore, we need to install differentials on both the front and rear wheels of the car, so that the wheels on each axle do not rotate each other.

Second, full-time four-wheel drive will generally be installed in the front, middle and rear three positions of the differential.

The aim is to enable the full-time four-wheel drive to overcome the speed difference caused by the speed difference between the front and rear axles when cornering. However, if the ** differential of full-time four-wheel drive does not have a locking function, the power cannot be fully transmitted to the driving wheel when passing through the cross shaft or when a single wheel is needed to get out of trouble, which greatly reduces the off-road and trouble-free ability of full-time four-wheel drive.

3. However, in real life, people who buy full-time four-wheel drive do not always drive to those rivers and ravines off-road, and many of the full-time four-wheel drive vehicles we buy are only load-bearing bodies.

Therefore, on the one hand, in order to save costs, on the other hand, in order to take care of the needs of driving in the city, manufacturers will install electronic limited slip to increase the ability of the vehicle to get out of trouble. Therefore, for an ordinary load-bearing full-time four-wheel drive SUV, even if it is equipped with a ** differential lock, its actual use significance is not great, because the load-bearing urban SUV actually does not have many basic elements of off-road vehicles, and whether it has a lock can not bring essential changes to its driving performance.

Personally, I think that the choice of four-wheel drive function requirements for car driving, not in all road sections, needed, when driving on urban roads, four-wheel drive mode, in fact, does not have much effect, but also will affect driving, fuel consumption will be higher。Therefore, for many models with urban road conditions as the main driving section, they are not equipped with four-wheel drive, not only considering the cost, but also considering the comfort of driving.

Mainly because the differential lock will lose part of the power, so the full-time four-wheel drive vehicle will cancel the differential.

Mainly because a full-time 4WD only needs a differential lock, so there is no need to add extra.

Full-timeThe difference between the four-wheel drive and the absence of a differential is that it will not be able to corner. Therefore, the power transmission of the full-time all-wheel drive model needs to be automatically adjusted to each wheel, and if it is locked to a certain ratio, there is no difference between the front and rear axles and it will be impossible to turn.

Therefore, full-time four-wheel drive** must have a differential to ensure that there can be a speed difference between the front and rear axles.

Key features:

Full-time four-wheel drive means that the vehicle has been maintained in the form of four-wheel drive throughout the driving process, and the engine output torque is distributed to the front and rear wheels in a fixed proportion, which can have better off-road and handling performance at any time, but can not make adjustments to torque distribution according to road conditions, and fuel consumption is higher.

In normal road surface, the vehicle is driven in two-wheel drive mode, and when encountering off-road roads or wheel slippage, the computer will detect and automatically distribute the power to the other two wheels. For the just-in-time four-wheel drive mode, the quality of the control program will affect the intelligence of the drive mode switching.

In addition, there is also a time-sharing four-wheel drive that is manually controlled by the driver to switch the drive form, and many SUVs and off-road vehicles now have two or more of the above four-wheel drive modes at the same time to complement each other's short and long.

The difference between one and three differential locks is mainly reflected in the vehicle's ability to get out of trouble and its off-road ability.

1. At present, civil vehicles with large power are equipped with up to three differential locks, and the number and form of differential locks determine the ability of the vehicle to get out of trouble. Models equipped with one and three differential locks vary greatly in off-road ability.

2. If the off-road vehicle only has one lock, it is usually equipped with a rear axle differential lock. The rear axle differential lock is suitable for situations where only one wheel has grip and it is basically impossible to get out of trouble on the cross-axle road.

If the vehicle is fitted with two locks, a ** differential lock and a rear axle differential lock are usually used. This off-road vehicle can handle all kinds of gravel roads and roads prone to single-wheel skidding, but cross-axle roads may not be passable.

If the vehicle is equipped with three locks, it will not only cope with all gravel roads and potholes, but also easily traverse cross-axle terrain.

How the differential lock works:

Take, for example, a force-lock differential lock. When the driver switches to low-speed four-wheel drive mode, the vehicle's differential connects the left and right half-axles into a single unit, so that the power of the vehicle's left and right wheels can be evenly distributed. At this time, as long as one wheel has grip, the vehicle can get out of trouble.

Summary. Hello, the four-wheel drive system is better than the rear-wheel drive with differential lock. The rear wheel drive with a differential lock can only ensure that the rear wheels have driving force, and once the two rear wheels slip at the same time, there is nothing that can be done.

The four-wheel drive system has a four-wheel drive system that exerts drive force to both the front and rear wheels, and when the front wheels slip or the rear wheels slip, there are other wheels that can provide the driving force. The four-wheel drive structure of the current model is generally equipped with electronic limited slip ability, when a wheel slips, the ABS system will apply braking to the wheel separately, so as not to cause the loss of power. It also plays the role of a differential lock.

Hello, don't worry, I can ask for your question, but wait a minute, I need text for about 2 minutes.

Hello, the four-wheel drive system is better than the rear-wheel drive with differential lock. The rear wheel drive with a differential lock can only ensure that the rear wheels have driving force, and once the two rear wheels slip at the same time, there is nothing that can be done. The four-wheel drive system has a four-wheel drive system that exerts drive force to both the front and rear wheels, and when the front wheels slip or the rear wheels slip, there are other wheels that can provide the driving force.

The four-wheel drive structure of the current model is generally equipped with electronic limited slip ability, when a wheel slips, the ABS system will apply braking to the wheel separately, so as not to cause the loss of power. It also plays the role of a differential lock.

That's still....Four-wheel drive is a little easier to use....

That's right, it's better to have 4 drives, with a differential lock, there will also be a big impact when the locking is combined, and the service life cannot be guaranteed. Once locked, the vehicle will not be able to turn, and forcing the turn will cause damage to the rear axle.

Okay....Okay, I wish you good health and success in your work.

There are two main types of four-wheel drive systems: parttime4wd and fulltime4wd.

The use of half-time four-wheel drive can be divided into two states:

One is two-wheel drive, where the car is powered by only two wheels, which is no different from a regular car.

The other is four-wheel drive, in which the front and rear axles of the car distribute power evenly in a 50:50 ratio. Half-time four-wheel drive has a long history, and its advantages are simple structure, high reliability, and more fuel-efficient after installing freewheelhubs.

Full-time four-wheel drive: It is a four-wheel drive system that keeps the four wheels of the car driving at all times.

If you want to subdivide the full-time four-wheel drive system, it can be divided into two categories: fixed torque distribution (front and rear 50:50 ratio distribution) and variable torque distribution (front and rear power distribution ratio variable).

Full-time all-wheel drive also has a long history and is more reliable, but it consumes more fuel.

Four-wheel drive systems are mainly divided into two categories, parttime4wd and fulltime4wd: 1. At present, most of the four-wheel drive vehicles we use are half-time four-wheel drive. As long as there is a special two-wheel drive and four-wheel drive switching lever or button in the car, then this is a four-wheel drive vehicle that uses half-time four-wheel drive.

Half-time four-wheel drive is the most commonly used four-wheel drive balance sock system for four-wheel drive vehicles;

2. The use of half-time four-slag blocking drive can be divided into two states: one is two-wheel drive, the car only has two wheels to get power, which is no different from ordinary cars; The other is four-wheel drive, in which the front and rear axles of the car distribute power evenly in a 50:50 ratio.

Half-time four-wheel drive has a long history, and its advantages are simple structure, high reliability, and more fuel-efficient after installing freewheelhubs. Full-time four-wheel drive: It is a four-wheel drive system that keeps the four wheels of the car driving at all times. If you want to subdivide the full-time all-wheel drive system, it can be divided into two categories: fixed torque distribution (front and rear 50:50 ratio such as attitude distribution) and variable torque distribution (front and rear power distribution ratio variable).

Full-time all-wheel drive also has a long history and is more reliable, but it consumes more fuel.

3. There are three differentials in the full-time four-wheel drive system: in addition to one differential on the front and rear axles, there is also a ** differential between the front and rear drive shafts. This allows full-time four-wheel drive to avoid the inherent problems of half-time four-wheel drive (the problem that four-wheel drive cannot be used on hard roads):

When the car is steering, the speed difference between the front and rear wheels will be absorbed by the ** differential. Therefore, full-time four-wheel drive has a more reliable four-wheel grip on hard roads (paved roads) and when it rains, which is superior to half-time four-wheel drive. But when it comes to snow and ice, the swamp must lock the ** differential (otherwise you may not be able to move forward); Back to the non-slippery hard road (paved road), immediately unhook the ** differential lock.

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