Manual sequenal box. Sequental gearbox: device, myths and advantages. What machines installed sequenal gearbox

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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.

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.

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, the usual car with mechanical 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 supermarital time to switch the speeds in combination with the power of the power unit, 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 cars BMW. 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.

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 of this transmission lies in the fact that instead of the osospheric, gears with straight teeth are installed here, and there is no clutch pedal (accepted this role the electronic unit control). Switching gears in the box is carried out using a hydraulic mechanism, which leads to a significant reduction in speed switching.

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.

The mechanical gearbox today evolved. Different transmissions were invented. They significantly simplified the control of the machine. An important step in this direction is the creation automatic box Transmissions. 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.

Hello everyone! Imagine the situation. You have accumulated money and think about buying a car. Not the last question will be the choice of gearbox. And here there is a thought - buy an automatic machine or stop the choice on old good mechanics. After all, it would seem that there may be more. But no. There is also a sequential gearbox.

I did not come up with it and the device really is. Although practice and communication even with their friends proves that far from everyone knows a similar name. And even more so not everyone can say what it is and how it works.

In order, you did not fall into the mud face and were a real expert in the field of gearboxes, I propose to understand this topic. More details. Maybe someone will then want to take a car with a sequential gearbox.

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.

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.
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.
Hydraulic type servo. Last distinctive trait. Such a device switches between speeds. Now many are confident that the hydroslist is the heritage of 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.

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 time spending on 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.

That's all I wanted to tell you. Thanks for attention! I hope you enjoyed it.

But the non-trivial switching mechanism inherent in the transmission type caused the designers to work in search of alternative gear shift methods.

And their efforts were not in vain - the PPC family was replenished first with automatic boxes, and then with other varieties - robotic, variable, sequential.

But it so happened that the ordinary car enthusiast with confidence can only speak of mechanics and machine gun. A much smaller number of motorists know what a variator or robotic transmission is. And very few of those who know how the sequented box works and works. We decided to fill this gap of automotive education.

What is a sequential type checkp

A classic mechanical box, despite some disadvantages, still occupies the dominant position in the automotive transmission segment. This is an objective explanation - to master the switching skills simply simply, only a small practice is needed. But the main thing is that such a gearbox provides the driver freedom of action: moving at the right speed, it can switch to any transmission without restrictions. For example, disperse, switch to the third immediately to the fifth, to move from the scene from the second and even the third, if there is a sufficient bias, dramatically slow down and turn on the second transmission after the fourth.

Of course, it is impossible to name complete freedom - the selected gear must match the load on the car and the speed of movement.

Sequential gearbox does not allow this. Its main difference from mechanics is the need to consistently incorporate all transmissions, regardless of direction.

You ask, and what is the point in such a transmission? The answer will be very simple: in simplifying the car management. There is no contradictions in this - the machines with a sequental box do not have a clutch, so the driver does not need to think about what transmission is currently involved, and what should be included when the speed set or, on the contrary, when braking. As a result, the gear shift process is noticeably accelerated, which can be called the main advantage of the ScPP.

Strictly speaking gearboxes this type - An integral part of motorcycles, especially old generations, where switching is carried out with a foot pedal. But today, for example, BMW motorcycles are equipped with this type of transmission, which over time also evolves, becoming more perfect, reliable and comfortable. So, currently produced seven-step sequential gearboxes of the SMG model. The first generation of such checkpoint was established on bMW cars Since 1996, the E36 M3 since 1996, since 2001, SMG 2 became the main transmission of E46 M3, and the third generation was included in the E60 M5 bundle.

If, when using a manual transmission, an experienced and skillful driver, about 0.6 seconds is spent on switching gear (the average indicator is noticeably higher), the use of modern sequented boxes allows you to reduce this time gap approximately three times, to 0.2 seconds.

Of course, for an ordinary motorist, it is not critical, but for athletes such a time gain is very significant, considering that during the race it is necessary to switch very often.

It should be considered a misconception that the spp is more complicated by mechanics. Box automat - yes, it is really a very complex device, but the transmission design of the SMG type is simpler than that of the manual transmission. If only because there are no synchronizer here, but we will talk about the device of sequential boxes a little later.

Thus, the correct answer to the question means that the sequential gearbox means is as follows: this type of transmission in which the transmissions switches exceptionally sequentially (1-2-3-4, etc.), both up and down, but down, but But much faster, while the clutch pedal is absent, and its role is performed by electronics. At least in passenger cars.

Device, Features, Principle of SCPP

You already know the main features of the sequential transmission - it is the impossibility of switching transmissions in an arbitrary order (or rather, the lack of free choice is possible). But what is the meaning of such a box? The fact is that the driver does not always have the possibility of inclusion necessary transmission By braking (when switching from the highest transmission) of the car. Especially in cases where the number of gears is large (from six and higher), which is characteristic of agricultural machinery, tractors, heavy vehicles.

Since the clutch pedal (but not the clutch itself) is missing, this theoretically simplifies control vehicle - The need for synchronization of movements of the left and right leg when switching speeds is absent. Clutch management is carried out receiving all the information you need from sensors and sensors tracking the degree of pressing the accelerator pedal and attempt to turn on a certain transmission. The ECU, analyzing this data, sends the corresponding signal to the actuator - the progressive SCP unit, which also performs the adjustment of the velocity of the car.

To have an idea, how a sevental gearbox works, you also need to know that, unlike the mechanical analog, it is used here instead of conical gears. Such a mechanism has more high efficiency Due to the reduction of friction losses, however, the torque decreases. This disadvantage is compensated by the installation of a larger diameter gear. Note that the level of noise when the transmission with strait gears is much higher.

Finally, another feature of the sequental box is the use of hydraulic servo drives, the function of which is to facilitate and speed up the switch between speeds. True, servos are used in robotic boxesBut there instead of hydraulics use an electrical drive.

If the motorcycle shift is performed on the motorcycles, then in cars - the usual lever or buttons (which are even more convenient to use, although this is a matter of habit). The location of the lever is either standard, on the center console, or on the steering wheel, which is characteristic of the "Americans" and "Japanese". Denotes such a box of letter "s" (from the word

Sequence, which is translated from English as "sequence", "consistent").

In some sequential box variations, the speed switching can occur in automatic mode. Usually such spps can operate in three modes:

standard mechanical, with manual switching gears;
sports mechanical, allowing to speed up the switching process;
automatic, eliminating the driver from the need to switch transmissions (yes, there are analogies with a box-machine, but there are many differences).

The principle of operation of the sequential gearbox is based on the use that was upgraded, equipping gears with straight teeth. Due to the presence of a hydraulic mechanism of servo drives from the driver, high accuracy is required when changing the mode of movement of the vehicle, which further simplifies the control of the car. Everything that he needs to take care - follow the load on force aggregate, producing sequential switching when accelerating and braking without the participation of the clutch pedal.

How does a noticeable reduction in time spent on switching speeds? The thing is. What's on mechanical gearbox When translating the lever from one position to another thrust of the drive mechanism, it pulls up, then its turn occurs, and only after that it is pressed. In a sequential box, a completely different principle is used - here the operation includes two traction simultaneously, one of which is tightened, the other is immediately pressed. In other words, when switching from the third speed to the second at the time of switching, the third gear is tightened, and the second is pressed. As a result, the overall switching time is reduced from one second (averaged indicator) to 0.12 milliseconds.

Many motorists confuse sequential boxes with cam. Between them really have a lot of total (spanned gears of increased diameter and length, as well as the presence of end protrusions that serve as the basis for engaging with cams), thanks to which it is possible to significantly reduce the switching time. Cars with cam transmission are more dynamic, but in this case the driver requires a lot of experience to switch to the right time. Sequental transmissions there is no such disadvantage. It is for this reason that the box of cam type is put exclusively on sports carsAlthough no one forbids you to perform and on the usual serial car. The designers of the Bolids of some "Formula 1" teams combined the advantages of both types of transmissions in one device, but, of course, to compare the skill of driving the riders of this superserve with ordinary drivers at least inappropriate.

We have already considered the conceptual advantages of sequental boxes at the conceptual level. It's time to discuss the benefits of transmissions of this type in more detail. So, the main advantages of using such a gearbox are as follows:

no clutch pedal. It turns out that it is good not only for beginners who may experience difficulties with two legs when switching speeds (situations where instead of clutch is pressed the brake - ordinary, and this is a practically guaranteed engine stop). Participants of the racing competitions on cars equipped with sequential transmissions are able to concentrate on the highway, without being distracted by the need to coordinate the movements of the hands and legs when changing;
switching speeds occurs at least three times faster. If we consider that the automatic box, which also does not have a clutch pedal, much more thoughtful than the manual transmission, then the sequental transmissions in this respect there are no competitors. The switch itself here requires a lever from the lever moving when accelerating and down when the speed is reduced. It is extremely simple: twitching the handle up until they releave up to 4-5 transmission, or down until the complete stop. No need to think about which transmission is incorporated now, and what should be switched to;
the absence of a time delay when switching speeds to some extent contributes to fuel economy. And although this effect is insignificant, but it has a battery effect - it should always be considered;
modern sequential type transmissions and so simply controlled by the vehicle almost to a minimum, moved control keys to the steering wheel. But it turns out, they offer an even more efficient option - the automatic mode of operation, when the driver should not think about switching transmissions - the electronics and a set of sensors will make all the work.

A sophisticated reader will certainly arise a completely reasonable question: if the sequenal boxes are so good, why have they still not received mass distribution?

The answer is trivial: along with undoubted advantages of this type of transmission, there are also equally obvious disadvantages, in most cases outstanding benefits. We describe them:

low resistance to high loads, without which it is impossible to imagine the operation of the transmission. No matter how simply no switching occurs, even if there is a scrap, you need to do it, given the appropriate speed mode - If you switch to a third from a speed of 60-70 km / h, it will be clearly mockery over the box. Regardless of the type. Features of the design of the sequential gear shift mechanism (in particular, the presence of hydraulic servo) significantly reduce the ability of gearbox parts to resist wear. Suffice it to say that on racing cars such transmissions come into disrepair literally after each stage. And this is expensive pleasure: the cost of the scrap is much higher than that of mechanics. But for the sake of winning the speed of the team, participating in races, are forced to go to such spending. For a serial car it is unacceptable. And although here we are talking not only about the forgiveness of the car management, but also about increasing the power and reduce the consumption of fuel, it's not a gift. The driver, as mentioned above, is reported to switch correctly, feel your car, choose the desired speed for moving from the lowest transmission to the highest and vice versa. If you have a small experience - errors in the use of sequential transmission will inevitably lead to its premature breakdown, and repairing such a box will cost you in a significant amount. So it is not necessary to acquire a car equipped with scrap, if you have no many years of experience in driving a vehicle with a carton and manual transmission. It is worth considering and the factant that domestic motorists will not be easy to rebuild work to switching the gear, the box of which is located not on the central tunnel, but on stealing petals. But it is the little things compared to the fact that even with a careful use of the service life of sequental boxes at times less than mechanical and even automatic;
such a transmission is different and high cost in service, which is also due to constructive features. If we talk about the cost of spare parts / consumables, then the situation is not at all rosy. And if you think that you can repair it yourself, then they are deeply mistaken here. Moreover, if you do not live in a metropolis, you still have to search for auto service where you will take for the restoration of the scope.

We also describe the major misconception related to the reference to the gearbox of a sequential type:

many believe that robotic and sequental transmissions are synonymous concepts. In fact, this is, of course, far from reality. Although the principle of operation of the boxes of both types is really similar, the differences are also more than enough. As an example, you can cite a type of servo: in a robotic gearbox it is electric, and not based on the use of hydraulics. The robot box is equipped double clutch To exclude jerks when switching speeds, the sequental analogue does not need it;
it is believed that the automatic transmission and spps always work in a bundle. It is also wrong, although it is possible to explain such a stereotype with an increase in the popularity of automatic boxes equipped with a sports mode. In fact, not always a sequential box has an automatic mode of operation and, even more so mistaken to assert the identity of these types of transmission. The most vivid example is racing cars;
it also offers the opinion that the SCPP is the attribute of only racing chambers, and certainly in combination with a cam mechanism. Yes, such a bundle is characteristic of motor racing, but the serial cars are already produced for a long time, which successfully operates a sequential type box. And without a cam mechanism - it is indeed the prerogative of racing cars.

Scope of application of sequential automatic transmission

Initially, such boxes are in fact installed only on cars used in different dump trucks. However, today this type of transmission in auto racing does not have competitors, allowing you to switch gear as quickly as possible and without an intermediate drop of revolutions. Several tenths of a second (strictly speaking - at least half a second) are a lot there, where the winner from the winner is often separated by hundredths of a second. Add to this a hydraulic switching mechanism - and get a really high-speed transmission, let and expensive enough.

But for more than two decades, the spp is installed on serial cars. The pioneer here turned out to be a BMW autoconecern, currently equipped with such a box, for example, M3 / M5 models from BMW or Mercedes-Benz C-Class. Some confuse such a transmission with a machine gun, called it "manual" by the automatic transmission, which is in principle incorrect, and we have already spoken about it. Holders of auto equipped with sequential gearbox argue that the management of the vehicle has become much easier, and an accurate move to the transmission is not required depending on the movement mode.

Many motorcycles are installed boxes operating on the principle of sequential gear shift, and such technology has been more than 50 years. This is usually a lever, switchable with a foot having two positions: forward and back. Neutral is located between them.

Sequental gearbox is installed on agricultural machinery (tractor, crawler technique). Here the switch lever is also located under the legs, like motorcycles, but can be installed on the steering wheel.

Finally, SCPPs are equipped with many models of heavy trucks and other heavy special equipment, in which the number of gears may exceed a dozen - it would be very difficult to control such a manual box.

Translated from the English "Sequence" means "sequence". Unlike the classical "mechanics", where the driver has the right to switch, for example, with 4 transmissions by 2, bypassing the intermediate, or to touch CO 2, the sequenal gearbox does not allow this: in both sides, switching transmissions can only be sequentially. What are the advantages and differences of a sequential box, and why is it invented?

What is a sevental box

Sequental gearbox on the car implies that the driver chooses the transfer not arbitrarily, and in a clear sequence, moving the gearbox in one of the directions. This is the difference between this box from "Mechanics", where, after squeezing the clutch, the lever is allowed to translate to any of the positions.

Such a gearbox - the invention is relatively new, which appeared in the early 90s of the 20th century. Initially, racing cars were equipped with these units: for example, BMW 3-series sports cars from the Motorsport division of autoconecer. Selection of a sequential box for equipping sports cars is dictated by test results: studies have shown that the driver can better control the machine with the help of such a box, in comparison with the classic automatic transmission, while it remains the opportunity to influence the transmission process as efficiently as on " Mechanics. " Especially this advantage of the sequenal unit is manifested where it is necessary to change the speed of driving consistently.

The new box has found the love of car owners, although some complained about some "slowness" switching steps of the PPC. But the second generation of sequental boxes solved this problem.

Important: Sequental box, like the automatic transmission, there is no clutch pedal.

Appearance of the switching lever:

Up shift increases the transmission, "down" - lowers. Some cars can also be equipped with switches on the steering wheel, for the convenience of the driver. The role of the clutch pedal is performed by the hydraulic mechanism under control, the latter also takes over the switch if the box works in the "complete" automatic transmission mode.

Interesting: Wide distribution This type of gear shift received in racing sports, designing agricultural machinery, heavy vehicles and motorcycles with a small number of transmission steps.

Cutting or sequental

Creating sequental gearboxThe developers set a goal to reduce the interval between speeds. Thanks constructive features This transmission is achieved by simplifying the switching and lack of operations with the clutch pedal. This is especially important for beginners and inexperienced drivers who have difficulties with the correct execution of switching procedures. But professionals will appreciate the CAT for advantage, due to its convenience and the ability to finely feel and control the behavior of the car using the maximum of its capabilities.

The principle of operation of the checkpoint, as already mentioned earlier - consistent switching, that is, the driver cannot "jump over" from 5 to 2 transmissions, he needs to pass each in turn. The design gearbox is a slightly upgraded "mechanics" equipped with an electronic unit and hydraulic mechanism (or electrical servo drives).

Sequental checkpoint in the context:

It should be mentioned that the engineers are also developed and the so-called camps, structurally similar to mechanical. Differences from ordinary "mechanics" - in the CPP coupling device: instead of a crown with small teeth, there are several large cams (up to 7 pieces), engaging with similar cams on the gear. Such boxes are equipped with two switching mechanisms:

search - normal optionwhen you can arbitrarily include any transmission;
sequential control system.

A box of cam type is used for the most part in sports cars and prepared for racing machines, due to high speed and switching accuracy. For everyday ride, its advantages are leveled high cost, demanding consumables and rapid wear. In addition, the lack of synchronizers requires very accurate action from the driver, and for the "urban" ride on such a gearbox is needed a good skill.

Advantages and disadvantages of a sequential box

Features of the sequential box and its design lead to obvious advantages:

Ease of switching and high gear shift speed.

ECU and hydraulics make it possible to reduce the switching time to 150 ms, which is critical for professional riders. No one, even the most advanced, classical manual transmission manual or automatic transmission, cannot be achieved this result. In addition to speed, the sequential box eliminates the "slip" by the desired transfer, because the transition between them is carried out strictly sequentially.

The speed of the machine during switching is not lost.

When working with the "mechanics" when shifting the gear, the speed is somewhat reduced. This is relevant for turbocharged motors that have time for the time while the driver makes manipulation with transmission, fall into the turboyam.

Cost efficiency.
Establishment of management due to the possibility of using submissive petals.
The ability to select mode - manual and fully automatic switching.

This is relevant for sequented boxes that can work in automatic transmission. But this design is used not everywhere, the sequential transmission is not necessarily combined with automatic.

There are disadvantages of sequential gearbox:

Increased exposure to wear and loads.
The aggregates are very sensitive to the operating conditions.
Dorganiza box and its service.
Parts of the PPC are quite expensive, and repairing it will also cost an impressive amount.

Features

Sequental box have four main features:

Sequential speed switching.

The driver will not "miss" by the right transmission and can always set the step of the gearbox, which is currently needed, passing consistently through others.

The absence of a third pedal - clutch.

Its role performs an electronic unit controlled by signals from numerous sensors.

Use in the design of the styling gear.

These elements have a large efficiency, in comparison with conventional dososes from the classical manual transmission, although the smaller gear is set to compensate for this).

Gear shifts are carried out hydraulic servo drives.

For comparison: in robotic checkpoints used electric drives. Therefore, to call a sequential box "Robot" technically incorrectly.