The number of cars on streets grows before the eyes. No wonder that at a choice of "an iron horse" there is a mass of various questions. A transmission in a car – one of the most discussed points. It would seem, everything is simple – it is necessary to work at mechanics as hands and feet, and on the machine gun it is enough to move the selector in the mode D and quietly to go. But everything is not so simple.
are subdivided into some types:
- classical "machine gun";
- preselective transmission.
Each of them needs to be considered separately.
Mechanical transmission exists already more than one hundred years. During this time it underwent a set of changes. Thanks to it designers brought it practically to an ideal. MKPP allows to transmit a torque from the engine to wheels through a set of shaft and gears. As a rule, 2-valny boxes are used, but improvements are constantly brought in them and the device becomes complicated. Anyway, main are characteristics of a box, and also its merits and demerits.
- Simplicity of a design.
- Insignificant weight.
- Low fuel consumption.
- High efficiency.
- The car about such check point can be towed and started "from the pusher".
- High maintainability.
- It is necessary to switch transfers manually that is very tiresome in traffic jams.
- Experience of a driving is necessary for fast and correct switching.
- Periodically replacement of a disk of coupling is required.
- Always the probability of an overheat of the motor remains.
Such transmission is chosen most often by men who like "to feel" the car on the road, women can advise "machine gun".
Classical "machine gun"
This transmission in a car initially was urged to facilitate as much as possible life of drivers who on a mnoga of hours stood idle in traffic jams. And AKPP was created. Its distinctive feature is lack of the mechanisms transferring a torque to wheels. Their role carries out a stream of special transmission liquid which is formed by 2 turbines.
In process of development of technologies such by a check point it was improved all the time. Steps (for example, already 8-band AKPP are issued now) are constantly added to it, there are winter, sports and economic modes. Besides, everywhere already there is a function of manual switching (the tiptronic, a steptronik, avtostik etc.).
The main thing in this transmission – convenience.
- Convenience . Perfectly is suitable for the beginning drivers and women.
- Existence of the manual mode /
- Impossibility to overload the power unit.
- Big weight.
- High fuel consumption (in modern boxes this defect is almost eliminated).
- More sluggish dynamics in comparison with MKPP (on new cars it is almost not felt).
- High cost of service and repair.
- High price of a car with AKPP.
- Impossibility of long towage of a car.
Apparently, many shortcomings of such transmissions either are almost eliminated, or are not especially felt in big cities especially as nerves and health where it is more important than money.
This transmission is a compromise between "mechanics" and "machine gun". Its design is similar to MKPP, but the principle of management is borrowed from AKPP. This type of a transmission as well as possible is suitable for the female drivers as the comfortable driving on it is possible only at slow speed. Such the InfoAdvisor.net check point recommends to representatives of a fine half of mankind.
- Small weight.
- Democratic price.
- Low fuel consumption.
- Pushes when switchings (it is especially noticeable during sharp starts and dispersals therefore the robot does not suit most of men).
- Sluggish dynamics.
This type of transmissions is characteristic, first of all, for Japanese cars. The majority of models of a golf class of the Country of a rising sun are completed with it. On a design such transmission is remotely similar to the principle of work of the motorcycle. There are 2 disks which will throw with a belt. Due to change of diameter of disks also the transfer number changes. Feature of a variator is lack of transfers – all of them virtual. This box perfectly approaches both to men, and women, after all its main fad – smooth dispersal (it is similar to dispersal of the trolleybus). However the variator is established only on cars with a small engine displacement – as a rule, to 2 liters. All the matter is that the principle of action of this AKPP is based on friction and is not able to transfer a big torque.
A little independently there are German transmissions – a multitronik. It is development of Audi firm. Its distinctive feature is existence of a metal chain instead of a belt.
- Very smooth dispersal.
- Low fuel consumption.
- Riding comfort.
- Small weight.
- Noticeable noise background in salon.
- Very expensive repair.
- High cost of service.
- Not really big resource.
- Low reliability.
- Does not suffer an aggressive driving.
This transmission in a car is characteristic for the German cars, in particular, for production of Folksvagen concern. Characteristic feature of this kind of transmission is existence of 2 disks of coupling. One of them is intended for management of even transfers, and another – odd. This box differs in smoothness and profitability, but its cost can unpleasantly surprise.
- Comfortable driving.
- Very fast (almost imperceptible) gear shifting.
- Excellent indicators of profitability.
- Fast dispersal.
- High cost of the mechanism.
- Complexity of a design.
- Low maintainability and high price of repair.
- At a long driving of coupling breakthroughs when switchings overheat and are felt.
Let's sum up the result
Apparently, options of transmissions weight. Everyone can find that to it to liking. In general to the men preferring aggressive style of driving and liking to control completely a situation on the road, InfoAdvisor.net unambiguously recommends traditional "mechanics". And here classical AKPP for certain will please sedate drivers and women. A variator – a choice of for whom in a priority smoothness of the course and riding comfort. The preselective transmission perfectly will be suitable for judges of all new. And that who is not able to afford a car with "machine gun", but does not wish to work hands and feet in traffic jams, it is possible to advise alternative option – the robotized transmission.