Sequent PPC Principle. Sequental gearbox: what it is. Sequental Transmission \u003d Robotic PPC

As we know, the evolution of the "boxes" of transmission in cars has led the world to the invention of automatic transmission, but the engineering mind did not stand in place, and the mechanical transmission was also not "removed into the closet" - engineers upgraded the gear shift mechanism, and created a sequential box. It switched only in series up or down.

Sequence - sequence

The principle of operation of this KP is simple as in conventional mechanics, however, it differs from the ordinary, habitual transmission, straightening gears, which are installed instead of osospheric, and the role of the clutch pedal is performed by a hydraulic mechanism. This mechanism allows to reduce the shift time, which is so important in the automotive sports. In addition to switching speed, such a box allows you to clearly switch the transfer at the time when the car is prone to vibrations and the use of the usual gearbox is difficult. Also one of the features of the sequential gearbox device is that the primary and secondary shaft in such a transmission is typical, that is, consists of several intermediate intermediate elements intermediate. Such a feature allows mechanics to quickly change gears on sports cars Right during races to choose the optimal gear ratios of gear wheels under the current contesting conditions. However, not only sports cars can boast a similar "box" - and on your "automatic" you can move the position of the selector in the side and get a sequential gearbox. You usually call it a "manual" mode.

There are 3 transmissions possible options WORK IN CAR:

• normal mechanical
• mechanical sports
• fully automatic

And how to live with it?

As we know, any gearbox can cause many disputes, have allies and opponents. It did not go around the party and sequential transmission. But let's in order: if you decide on a car with a similar transmission - you will be drawn by the absence of the coupling pedal and the speed of the "boxes", in addition, like any "mechanics", sequential transmission will save you fuel in comparison with the ACP. The second undoubted plus is to travel in several modes, about which we told above. Complements our series of advantages to switch gear directly on the steering wheel, if there are petals.

However, as we all understand, there are no ideal mechanisms, therefore, even in such an ideal box, there are problems. Since the clutch, as such, is missing - the hydraulic switching mechanism suffers, because it is extended more than the usual due to increased loads. Look at the competition in motor racing, for example on drift, where almost after the pair of three races of mechanics are ready to repair the gearbox. Serial cars, of course, allow you to enjoy the ride a little longer, because if you do not play in sport driver On the road, your gearbox will live happily and happily, but if you decide to play the rider - get ready for repairing such gearboxes is very and very consistent, but replaced with a new one more.

Myths and legends

It seems that the technical and financial parts tried to figure out, and now let's go through stereotypes associated with such boxes:

• "Sequent this robot." And here is not! Let the principles of operation in such transmissions are similar, however, the robotic transmissions are electric, against the hydraulic sequental.
• "Sequent tank and automatic are inseparable." - not guess again. If there were no wide distribution of sports modes on modern automatic transmissions, you would not know about the sequental box. Therefore, in civil versions there is a mixture of options, and sports cars with automatic transmission I have not met.
• "Only for sports cars, only for cars, only with the camps." - There is no definitely if used in a pair, your advantage will be cosmic, but also on serial cars such transmissions exist in more than a decade.

Did not scare away?

If the transfer of all the advantages and minuses did not scare away in a desire to take possession of such a type of transmission - I can only say one thing. This is the most promising type of "mechanics", which is relevant to powerful cars, And if such a box is also engaged, to refine it and improve - we can return to that ideal world in which cars on the mechanical transmission have a place in everyday use, and in most models from manufacturers.

Car shift box is one of the most progressive nodes. vehicle.

During the production of cars, fundamentally new gear shift systems were developed with characterized mechanisms. One of these devices is sequential gearbox.

Sequental gearbox: what it is

The concept of "sequental" happened from the English word sequenceWhat does "sequence" mean. The transmissions in such a box are switched sequentially, from the lowest to the highest, and vice versa. This principle of switching is used in motorcycles where control occurs. Indeed, managing gear shift, it is difficult to make complex manipulations. Therefore, they chose a simple algorithm: the movement of the lever up corresponds to increasing the transfer, down - the transition to a lower gear.

Video - clearly shown how quickly shifts on sequential gearbox:

There are still some vehicles where sequential gearboxes are traditionally applied, military equipment (self-propelled artillery machines, tanks). They have their own specificity. First, they manage unqualified drivers. Secondly, a quick transition to increased transmission with minimal "failures" by power during switching is carried out. The second quality (practical absence of failures in power and speed) causes the use of sequential transmission to high-speed sports cars.

Video - What does a sequential gearbox mean peugeot car 208:

Principle of operation of a sequential gearbox

The design of the sequental gearbox in appearance differs little from the traditional mechanical gearbox.

If you consider the gear mechanism closer, you can immediately notice that the teeth are strictly perpendicular to the side surface of the gear.

It is necessary to ensure their rectilinear movement during switching.

On the one hand, the boosted gears have less friction than cobbikes due to the complete matching of surfaces. On the other hand, the stubbread gears in the manual box are designed to increase the torque that maintains the gear gear. Therefore, many sequental boxes are installed gears of enlarged size in width. Thereby enhances the design of the teeth and their strength.

The design of the sequential gearbox is pretty easy to organize automatic mode switching. The following sequential checks are distinguished:

• with normal mechanical system shift gear;
• with sports switching system;
• with an automated switching system.

Hydraulics are used to increase the switching speed. Using hydraulic servo drives, the minimum switching time. During activation of the transition to another transmission, the hydroaccumulator is filled, which contributes to the creation of pressure in the hydraulic system. The transfer time is the tenth share of a second. This decisive fact determines the use of sequential gearbox in sports cars. Often, the controls of the CAT are carried out to the steering column area, which further simplifies the management of the modes.

What does it differ from robotic

Many motorists mistakenly believe that sequental gearbox is a close relative robotic. Their fundamental difference is to be used in a sevenual frame of the hydraulic system when switching gear. Robotic box uses for this electric drive. Also in robotic boxes, another gear gear mode is applied.

Video - shift gears on sequential gearbox car:

Their advantages and disadvantages

The main advantages of such boxes:

• minimum time to switch speed;
• minimal losses on the power of straightforward gears;
• fuel economy;
• the ability to move from manual to automatic mode;
• the ability to control the switching from the steering column;
• the use of the system without using the clutch pedal.

Disadvantages of sequential checkpoint:

• sequential gear shift sometimes shigns the driver in terms of applying extreme driving styles, the necessary transmission inclusions, for example, during the start of the engine "from the Tolkach";
• relatively high gearbox under similar power;
• reduced service life associated with the technical complexity of the mechanisms;
• the big cost of maintenance and repair.

In which passenger cars you can find a sequential gearbox

Of the most common passenger cars You can cite an example of the BMW 1996 release with the SMG box. SMG1 and SMG2 systems were installed on the BMW of the third series with an index S. Since 2004, such a transmission was installed on the BMW E60 M5. Also, sequential gearbox was installed on separate models of Toyota Corolla cars, Mercedes C-Class, BMW X5.

The location of the sequential gearbox and its elements is shown in Figure:

Figure: 1 - Sequential checkpoint control unit, 4 and 5 - indicator and mode switch, 7 - 6 step gear, 12 - hydraulic unit, 10 - hydraulic engineering, 11 - clutch.

Features of the installation of sequental gearbox on VAZ cars

Many car enthusiasts as the upgrade of their vase acquire sequential gearbox shift boxes with a cam mechanism. Them appearance Approximately such.

As for the significant effect, it is not necessary to count on it, as the dynamics of the car at the same time, judging by the reviews of the owners, increases slightly, although these boxes are referred to as "sports". In addition, the weight of such boxes is usually higher than traditional. There used wide massive gears with perpendicular tooth arrangement to compensate for their low load capacity.

In addition, the sprinkle teeth increase the noise of the PPC. The real life of the sequential gearbox handicraft production is small. This transmission can be installed if the car is involved in sports competitions, but not for everyday ride in the city.

conclusions

Summing up, it can be noted that the development and implementation of a certain technical progress in the development of automotive systems into the mass production of sequental gearboxes. Wide distribution such gearbox did not receive due to the presence of numerous flaws.

Read about and what it affects.

The thickness gauge of the car-painted car body cover and have various principles of work.

As the situation shows at the automotive forums, many motorists are very interested in the question of what is a sequential gearbox. Immediately answer that it is often mechanical box (although today is increasingly found and automatic options), the main feature of which is the ability to switch the transfer only with strict alternateness up or down.

Thanks to this driver, it is not necessary to think about what kind of transmission to activate - he simply increases it or lowers. But there is a gearbox and other features from this type, so we will describe in more detail in more detail what the sequenal gearbox means.

So, the main feature of the sequential gearbox is the absence of the possibility of free selection of gear and jumping immediately through several. The need for such a gearbox arose due to the fact that the driver does not always have time in order to choose the necessary transfer And brake for switching it. By the way, such improved mechanical gearboxes are used not only on vehicles, but also on the motor transport, where the switching between transmissions is often carried out by foot.

If we are talking about sequental boxes installed on carsHere they will be distinguished by the location of the control center. The lever (and sometimes even more convenient and responsive buttons) for convenience is located on the steering wheel of the vehicle, while it will be referred to as a special labeling "S", which indicates the presence of a sequential gearbox.

Important!On some cars with a sequential gearbox, switching between transmissions can be carried out not only manually, but also automatically.

Such a gearbox has three basic operation modes that can be activated in parallel with the main gears:

Standard mechanical.

Mechanical sports.

AutoWhen the driver does not need to switch the transfer at all.

The last feature of the sequential checkpoint is that when it is installed on the car, the need completely disappears in installing the clutch pedal. This not only facilitates driving, but also allows the engine to operate under standard conditions that do not depend on driving style and driver experience.

Where sequential automatic transmission applies

Sequential automatic transmissions today can be found primarily on racing cars, as they are quite expensive pleasure, and in their destination are fully adapted for such types of cars. Thanks to such a gearbox, the driver gets the opportunity to increase the speed and switching from transmission to the transmission without a slightest slowdown, which is especially important for the competition. If, in addition, such a box will work on the basis of hydraulics - it will further increase the responsiveness of the car.

As for the usual passenger cars, then the sequential gearboxes installed on them are referred to as "manual" mode of operation. automatic box Transmissions. Nevertheless, even in this version, the car is considered lightweight and does not require an accurate drive from the driver. Among serial cars on which such boxes were installed, it is worth name:

BMW M3.

Mercedes Benz. C-Class.

But in fact, the sequential checkpoint is more common than it may seem at first glance. As mentioned above, such boxes are installed on motorcycles, where there are usually only two transmissions. As for the neutral position of the CAT, it is usually fixed on the motorcycles between the first and second gears. The sequential box has received more distribution, when designing and creating agricultural tractors, on which the button or gear lever can be located both under the driver's feet and on the steering Wheel. Sequental gearboxes are found on heavy trucks.

Device and principle of operation of the sequential gearbox

The basis of such a gearbox is a familiar mechanical transmission that has been improved and equipped with straight gears instead of osostic. The essential constructive difference of the sequential gearbox is the absence of the clutch pedal, which is compensated for by installing the electronic control unit (it is automatically in the automatic operation of the CAT and is responsible for switching gear).

Turning the gear due to the hydraulic mechanism is obtained as fast as possible and does not require accuracy as on conventional checkpits. All that is required from the driver while driving a car with such a box, is an assessment of the complexity of the road and a load that is transmitted to car Engine. To make it easier for his work, it is necessary to gradually increase the programs. If you need to maneuvering at low speed, the transmissions are reduced taking into account the behavior of the car and the revocation of the engine.

Sequental or cam gearbox?

It is also worth mentioning the existence of cam flaps that in their structural features Have a lot of common with sequental. In particular, they are combined by the presence of spanleless and long gears with end protrusions (for which cams are cling to), thanks to which such gearboxes allow you to switch to the other as quickly as possible, without reducing the speed of movement.

However, determine which gearbox is better, almost impossible. For this reason, the designers simply combined them into one mechanism, which today is used on racing cars that participate in Formula 1. So the cam gearbox is more correct to call a good alternative to sequential gearbox.

Advantages of using such a box on cars and other types of transport

We have already figured out what sequential gearbox is. However, let's summarize about all the advantages of using such a gearbox on different types Transportation:

1. No clutch pedals. This feature is most relevant for those who only develop driving and can confuse pedals. In addition, the lack of clutch makes it easier to control the car in difficult racing conditions, when the driver is not important to concentrate on the power of the natiska on the pedal, but on the track.

2. Transfer switches as quickly as possible. In this, no other type of gearboxes will not be able to compare with sequental gearbox. This dignity should also be attributed to the fact that when the lever is pressed up or down, the driver does not have to think about what transmission to translate the lever. It just increases them or lowers.

3. Car designers also note that the lack of slowing during the transition from one transmission to another is also positively reflected on fuel economy.

4. Work on two modes - automation and mechanics. Despite the fact that the designers and so simply simplified the process of managing a car with a mechanical sequential gearbox, moved the button to the steering wheel, in some situations the driver can refuse to control the transmission and entrust this task exclusively by the electronic control unit.

Disadvantages of sequential gearbox

Sequental box The gear is not deprived of a number of deficiencies, and they are bounded mainly with the design of such a gearbox. The first thing you need to think when buying a car with such a gearbox is accelerated wear transmissions. Do not forget that in extreme and too harsh conditions of operation, the hydraulic mechanism is rapidly wears and may fail at a very inappropriate moment. For this reason, racing cars have to fully sort out and change the spare parts literally after each race.

It was also mentioned above that thanks to the installation of sequential gearboxes on serial cars, their power increases significantly.But there is here and your underwater stone: it is possible to achieve this one if it is possible to switch from the lower on top of the highest transmission on time. If the driver feels badly his car and its needs, it can again lead to the failure of all elements of the hydraulic transmission. At the same time, the restoration of such a system will cost the car owner very expensive.

In this regard, it is recommended to sit behind the wheel of the car with a sequental gearbox, only drivers with experience, which drove their own on the manual box, and on the machine. The lack of experience in driving a car can negatively affect its condition.

Translated from English sequental translated as a sequence. Therefore, a sequential gearbox means only a sequential speed switching. This principle of operation lies in the impact on managing the leg (a motorcycle can serve as an example), for quick switching - a sports car; In the case of a large number of gears, the choice of which by switching the lever is not very convenient - this is a tractor, trucks. Most often switching due to the displacement of the control organ from the neutral position. While the principle of work of the classic checkpoint is self-election Transmission.

Sequental gearbox

Development of sequential box

What are the transmissions boxes not been created in the history of the automotive industry. So the creation of a sequential transmission has not passed by. Most often, we hear, a manual transmission or automatic, but it is worth understanding that this is not limited to this, since there are still many options for switching speeds.

Between these gearbox, there is a difference that it is worth understanding. Take, for example, a conventional machine with a manual box. In this case, the driver independently makes the selection of speed transmission. That is, dispersion, he has the opportunity to switch from the third speed to the fifth or, on the contrary - when braking, go with the fifth to the third. This mechanism can still be called search, as the inclusion of speed transmission completely depends on the driver. Once again, I would like to note that the transmission can be any, most importantly, to match the mode of movement and load on the car.

But what concerns the owners of a sequential gearbox - they are such a possibility of free switching devoid. This action can only be carried out on one value or up, or down. That is, switching will look like this: two to three or four or seven or six or five, which is characteristic of BMW motorcycles and M1-M motorcycles. It is impossible to achieve another switching on such a box.

Sport type M.

A seven-step sequential gearbox was developed relatively recently. This is the first model of the 7-speed SMG gearbox in the global automotive industry. Due to its ultra-long time to switch speeds in combination with power power aggregate It allows its owner to make its own choice of sports or comfortable ride style.

Historical information

Such a box has already managed to become traditional for bMW cars. Already in 1996, SMG 1 began to be installed on the E36 M3 model. In 2001, the equipment of the E46 M3 models was carried out by SMG 2. And already in 2005, the E60 M5 model passed the SMG gearbox setting the gearbox (which began to distinguish this transmission from previous models, so this is a noticeable reduction in the time transmission time.

Seven-step sequential gearbox for BMW

This third-generation transmission model is equipped with individual shift drive throws, which made it possible to achieve a tangible loosening of thrust at the time of switching. How could this happen?

How does the switching process occurs

By comparing the usual gearbox with sequential SMG 3, you pay attention that in a conventional gearbox at the time of switching the shift drive drive pulls up, then rotated and pressed. In a compaable device, everything is different. It turns out that one thrust at the time of switching is tightened, and the other is pressed. That is, at the time of tightening the thrust of the first transmission of the second transmission traction is pressed. This made it possible to significantly reduce the time interval of switching in comparison with the usual gearbox.

Work sequential gearbox

So, a familiar mechanical gearbox has evolved and allowed to come to a new type of transmission, which should simplify the driver control by the car. And in such an important invention was the automatic transmission, which was upgraded and improved. And today, it gives the opportunity to the driver, in general, do not think about what and when to switch speed. But also mechanical equipment No one dropped to the side. She also continued to develop and here the result of these surveys was the sequential gearbox. The result of such a transmission was the inclusion of speed in a strict sequence.

Principle of operation

This type of checkpoint was developed on the basis of mechanics. The main difference between this transmission lies in the fact that instead of the osospheric, gears with straight teeth are installed here, and there is no clutch pedal (an electronic control unit has been taken on this role). Transmission in the box is carried out using hydraulic mechanismwhich leads to a significant reduction in speed switching.

Racing car with sequential gearbox

Special distribution installation of the gearbox with a sequental mechanism found in racing cars. Realizing that such a sequential gearbox will be particularly convenient to drivers drivers, it means that it was necessary to perform such an installation on racing autocars. This is explained by the fact that high speed contributes to the strong vibration of the car and in this case the driver is difficult to get into the required transmission, while the sequential gearbox is able to cope with such a task.

Advantages and disadvantages

Such a sequential transmission has its own characteristics. The advantages of this unit can be distinguished by the absence of a clutch pedal, which is especially convenient for beginner drivers. Following positive qualitycharacterizing this device model - speed switching speed, which exceeds classic automatic and mechanical transmissions. Another advantage is economy that occurs due to the abbreviated speed switching. It is also possible to select mode - mechanics or automatic.

The disadvantage of this device can be called its design. That is, this mechanism is not resistant to wear and with high load quickly fails. As an example, racing auto channels can be brought. After each check-in, the sequential gearbox is most often subjected to mandatory bulkhead. In principle, if you do not comply with the operational rules, then on the serial auto sequential gearbox may fail, which means it will entail expensive repairs.

How it works

We all know what is an automatic or adaptive and manual box. In the first case, the system does everything itself, relying on the current loads and speed of the machine. That is, adapts to the car. In the case of mechanics, you need to independently switch transmissions.

In the case of a sequential gearbox, it is important to notice that it is characterized by the ability to switch the speeds consistently. Roughly speaking, if on the mechanics you can "jump over" from 5 to 3 speed, then the sequentalka will not make this. There is a sequence of switching, to break the scrap cannot.

Initially, the SCPP was created for racing cars, Formula 1 chambers and cars that take part in professional racing. But I liked the idea to automakers, because of what many introduce such boxes in civil cars. And it pleases.

The mistake of many is that they consider the SCPP analogue of the automatic transmission. In fact, the source of inspiration to create a sequentalka served mechanics. Built it on the basis of the manual transmission.

Consider the principle of operation of this device and key features Scrap. So you will understand that this is and how the entire sequentalki system works.

1. SPPP has no clutch pedal. This is pleasantly pleased with those who do not have much driving experience. Management is simplified, no need to constantly squeeze the clutch. The electronics that receives signals from the sensors are responsible for it when reading the gas pedal and transmission pedal. The box, receiving a command from the control unit, the sensors transmits a speed signal on which the machine is moving now. The progressive unit is the last stage where the motion parameters are adjusted. It studies literally everything, from the rotor of the motor to the included or turned off the air conditioner.
2. In the sequentalki design, the gearboxes are used. Their efficiency is higher compared to the dososube designs on the mechanics. The latter have impressive losses for friction. Although the sprinkle transmits a smaller torque. To compensate for it, the gears put a large size.
3. Hydraulic type servo. Last distinctive trait. Such a device switches between speeds. Now many are sure that the hydroslove is the property robotic boxes. A common mistake, because electric devices use there.

The sequentalka works extremely simple. You can use the gearbox lever or stealing petals. This is a technology borrowed from racing chambers, which has taken root in the people. Especially in the company BMW and Toyota.

If you look at the box, you will see a lever that moves up and down. Plus there are additional modes, depending on the automaker.

Pressing up (where it costs +) raises one transmission upwards, and the movement to the side with the "minus" allows you to lower the box to 1 transmission.

That's what it means comfortable and convenient. It is not surprising that many are striving to put the scrap on their own car. Some craftsmen manage to shove the box on the VAZ 2108 and 2107. There are factory models that go paired with sequential.

But I will say honestly. This is relevant for sports cars, which are waiting for speed and minimal losses during acceleration. For a car, under the hood of which less than 150-200 horse powerAnd who serve for family trips, there is no need for SPPP.

Principle and device

The easiest way to compare a sevenual box with mechanics. Moreover, the base they have almost the same. The main difference is the gears. Here, instead of oblique teeth go straight. In the same design there is no clutch as unnecessary.

Attention! The control unit meets the control unit.

Switch itself occurs by hydraulics. Thanks to all these features, a sequental box is often installed on racing cars. The general denominator of all these modernization was the fact that the PPC ceased to depend on vibrations. More precisely, the rider does not need to spend time search for the right transmission.

When comparing, a conventional gearbox and a sequental box are necessary special attention Perform the torque switch. As soon as this happens, the drive pull is pulled, rotated and pressed. This happens in the standard system, but not in consistent.

It is interesting: Fuel filter Mazda 3.

In a sequential box, when switching, one traction pulls up, and the other is responsible for pressing. Due to this, the time interval is reduced. This technical innovation made it possible to reach a new level of performance.

What is a sequential gearbox:

Features of functioning

The switching lever in the machines on which the sequented box is installed on the steering wheel. In some modifications you can see the buttons. In this case, the system operates in such modes:

• sports;
• standard;
• automatic.

In the first two versions used mechanics. It is not surprising that many beginner drivers prefer to ride exactly on such a gearbox. Once, they will achieve the desired level of driver skill - for them the entire range of system capabilities will open.

Sequental gearbox

Sequental car gearbox

The difference between the sequential gearbox from the standard mechanical is that such boxes are only two-rolled, all gears in them are only straightforward and there are no synchronizers. Their role is performed by moving couplings, which include transmissions. In addition to constructive differences, there are also operational: in mechanical gearbox The transmission turns on after the clutch is turned off (Experienced drivers switch transmissions Selecting the necessary speeds and without clutch), and in the sevenual box when driving in a straight line or migrant, you can switch to clutch, which allows you to make their design. Also, the advantages of sequential gearbox can be attributed to:

• smaller dimensions box case;
• the ability to transmit greater torque;
• withstands variable loads;
• the switching speed is 0.1-0.2 sec;
• when changing gears do not fall engine speed;
• the power in the transmission is not lost, which is caused by heating parts;
• easy service.

In a sequential box, when driving in a straight line or migrant, you can switch to the clutch.

It is worth noting that the principle of operation of the sequential PPC is based only on a consistent change of gears in both the opposite and directly. Thus, the increase in gears is carried out stepwise, i.e. It is impossible to jump, for example from the second to the fourth, because this will prevent the design of the box.

Also one of the features of the sequential gearbox device is that the primary and secondary shaft in such a transmission is typical, i.e. Consists of several intermediate intermediate elements interconnected. Such a feature allows the mechanics to quickly change gears on sports cars right during racing, to select the optimal gear ratios of gear wheels under the current conditions of the contest.

Pros and cons

Now you know what SCPP is and what sequentality means. Not? Yes, this is the sequence translated. Here in general everything becomes in place.

After watching the video and studying the features of such a box, the question arises - whether to take the car with this checkpoint. A little help you, told about the strong and weak sides Sequent.

Let's start with advantages.

• High switch speed. The machine lives his own life, because sometimes it frankly tupit and does not do what you expect. Machine switch more difficult. The optimal speed gives the scrap. The electronic unit and hydraulics provide minimal costs for the transition to transmission. For professional motor racing, it is extremely important.
• Convenience. Squeeze the clutch pedal, get into the transmission, and even at speed when bad road - Pleasure dubious. SPPP guarantees accuracy and comfort when switching. This is indisputable fact.

• No speed loss. Yes, the sevental box switches quickly, there are no failures between transitions, from here and measured ride, fast speed set.
• Fuel consumption. All previous items affect the emergence of this advantage. SPPP carefully consumes fuel and helps save.
• Steal petals. Additional option, allowing you to feel like a rider. Convenient and unusual.
• Two modes. But here I will make amend. This automatic transition function has a manual mode with a sequential system. So it is rather plus automata.

But not everything is so perfect. SPPP has two essential drawbacks.

• Low stability to loads and wear. The system is complex, consists of a plurality of elements and requires accurate circulation. It is impossible to simply click the petals or lever. You should choose correctly for switching. If this is not done, the mechanisms will quickly fail. Not in vain spps are on cars of professional riders.
• Price. It is high on the car itself with spp and for servicing such a box. Although if you have money on a car with a sequentalka, the cost of its repair should not be a problem.

Historical information about sequential box

Sequental box is often used by BMW designers in their cars. The first implementation occurred in 1996. Then the E36 M3 model acquired a similar system.

Attention! The modification of the sequential box was called SMG 1.

For five years, drivers managed to evaluate all the advantages of a sequental box. As a result, in 2001, the line is replenished with SMG 2. E46 m3 cars are equipped with it.

The concept of E46 M3 became a real hit. Moreover, the reviews of motorists were about it more than positive. Finally, in 2005 SMG appears 3. In it, the time costs needed to switch are even less.

The mechanical gearbox today evolved. Different transmissions were invented. They significantly simplified the control of the machine. An important step in this direction is to create an automatic transmission. Later she changed and improved. Now the driver does not need to think at what point you need to go to a certain transfer.

But engineers did not leave without attention and mechanical transmission. It was improved and changed. New mechanisms appeared. The result of such active searches better option - Sequental gearbox. In this case, transmissions can only be included in a specific sequence. In order to increase the transmission, up to lower - down.

Translated from English sequental means "consistent". In such a box, you can switch transmissions only from the highest or lower to the highest. This principle is provided in the motorcycles with foot control. When switching gear, make complex manipulations problematic. That is why in this case is used by a simple algorithm: if the lever moves up, the transmission rises if down - drops. This option is very convenient.

Sequential gearbox differs from the standard in that it only happens to two. In this case, synchronizers are missing, and the gears are always only spoiled. They need them in order to promote coupling that directly include transmissions. The differences are not only in terms of design, but also exploitation. In order to enable transmission in the checkpoint, you need to turn off the clutch. In a sequental when lifting up a mountain or movement, direct is possible to switch gear, without turning off the clutch.

Advantages of sequential box

Sequental box has a lot of advantages:

• The case of the box is much smaller.
• You can transfer significantly greater torque.
• The design is able to easily withstand variable loads.
• Switching occurs at high speed.
• Transmission does not affect engine speed.
• In the transmission, the power caused by heating elements is preserved.
• There is a sufficiently small load on the bearings of the shafts.
• Maintenance is maximally simple.

The transmissions are changed only in direct or in the opposite direction. You can only raise the transfer. Throw from the first to the third, for example, it is impossible. This will not allow the design of this box. Another significant difference between the sequental box is the secondary and primary transmission shaft set. They consist of interrelated intermediate elements.

If a car is needed, which will quickly accelerate up to 100 km / h, have high dynamic and high-speed indicators, you should pay attention to the transport where the sequential type of gearbox will be installed.

What is a sequential gearbox?

Sequental gearbox in disassembled form

Sequential gearbox ensures the dynamism of the stroke, as well as the convenience of controlling the machine. Speed \u200b\u200bswitched in a strict sequence. This type of checkpoint received its distribution in the mid-1990s.

Principle of operation of a sequential gearbox. Using the selector is shown high-speed modes. The box makes a worthy competition to famous types of gearbox. Despite the fact that there is a clutch, control them is carried out thanks to the electronic unit.

Conceptual image of gearbox

It should be noted that the weight of the sequental gearbox is small. Despite this, a large moment of power is produced. It is based on the gears that have straight teeth, a servo, based on a hydraulic basis. This is the reason why speeds quickly switch. Existing activation couplings are a series of cams. Sequental box does not allow the motorist to carry out a free choice of gear, i.e. jump immediately through several.

Thus, the machines where this species Boxes, characterized by high speed switching speed. Since the box is based on the hydraulic system, there is a responsiveness of transport.

Sequental Box Machines

BMW M3 with sequential gearbox

Meet this box can on cars brands BMWwhere there are individual drive thrust that reduce the shift. In particular, on a BMW M5 E60 foreign car, this unit contributes to an increase in driving dynamism. The machine is equipped with two axes with disc ventilated brakes, control stability control. It should be noted the presence of two-disc clutch, two leading and slave disks, an intermediate disk. In addition to this version of the car, the specified box type can occur at BMW M3, Mercedes Benz C-Class. The listed machines belong to the category of sports.

Among domestic carsThis box meets on VAZ-2108. The unit is a simplified version of standard mechanics. The operation of this device allows you to effectively maneuver, quickly move from one transmission to another.

Strong and weak sides of cam gearbox

A number of high-speed vehicles are camps. Advantage this type The boxes are that it allows the machine to achieve high speed indicators. The components of this checkpoint allow to withstand high loads. Due to the fact that there are straight gears here, an increased efficiency is noted, a lesser extent is created axial loads on the shaft of the cam gearbox. The switching mechanism for this PPC is serial (sequential). Speed \u200b\u200bchanges occurs as a result of the shift of the lever forward or backward. As a rule, the camps no synchronizers have no synchronizers, which increased the speed of the box.

During movement, the gear shift is carried out without lifting the clutch, it is enough to release the accelerator pedal. When changing turns power plant Do not fall, as a result, acceleration is faster.

However, the cam box has a number of shortcomings:

• relatively small working resource;
• high price;
• from an economic point of view, the direct installation of the box on the car to the place of existing (automatic transmission or manual transmission) is not a profitable solution.

To extend the resource of this CAT, it should be diagnosed from the entire automotive system. In addition to this to replace the oil. Otherwise, with long-term operation, a large amount of metal particles will appear in a combustion. This helps to reduce the PPC resource.

Thus, sequential automatic gearbox You can meet on racing machines, motorcycles. This gearbox is characteristic not only for passenger, but also heavy trucks. Speeds can be switched through stealing petals, which is the advantage of the CAT. Easy to control is an additional aspect, why you can make a choice in favor of the car with this box.