Introduction
There is no doubt that the 9g Tronic automatic transmission is one of the best products to have been produced by Mercedes-Benz. The presence of the 9g automatic transmission ensures that drivers will drive more smoothly and even more fuel-efficiently. Having been synonymous with quality and innovation, there is little wonder that the company has created a gearbox system that improves comfort, performance, and efficiency. In this article, we look into the latest gearbox more closely and see how it compares to its predecessor, the 7g Tronic automatic transmission. Continue reading to learn more.
Is the 9G-Tronic dual-clutch?
The 9g Tronic automatic transmission sees individual gears engaged by three multi-disc brakes and three multi-disc clutches. Multi-disc clutches play a vital role in transferring the drive torque between 2 components as a friction connection. Thanks to the ratio configuration of gears 1-9, it is possible to allow the wide ratio spread.
How is the 7G Tronic Different from the 7G Tronic Plus?
Put simply, the 7G Tronic is what succeeded the 7G Tronic automatic transmission system. It was an upgrade of the 7G Tronic system and it improved fuel efficiency and also provided smoother shifting of gears. It is compatible with any Mercedes-Benz model provided it is fitted with a start-stop engine.
What is G Tronic Plus?
The simplest definition of the 7G Tronic Plus is that it is a type of automatic transmission containing seven gears that keep the speed of the engine as low as possible in all driving situations. Leaps in the revs are reduced when changing gear thanks to finely graduated gears and a wide gear ratio difference. The result is that you experience great comfort when shifting gears and also save fuel.
What does 7G Tronic mean?
The term is a trademark name that Mercedes-Benz uses to refer to the 7-speed automatic transmission gearbox. It starts with the W7A 700 to W7A 400. It is the system that was replaced by the 9G Tronic automatic transmission. Although it is not widely used these days, it is still present in some Mercedes-Benz models.
In What Ways is The 9G Tronic better than the 7G Tronic?
In a typical automatic transmission system, the hydrodynamic torque converter is the drive element. The 9G Tronic system sees an improved hydrodynamic circuit that’s in the torque converter while at the same time increasing fuel efficiency by a whopping 92%. This will be music to the ears of drivers as it means they can save a considerable amount of money on fuel. In other words, the 9G Tronic can convert a high fraction of engine power into tractive power. It is much better than the first generation 7G Tronic which had a considerable efficiency of only 85%.
The heat produced during its operation is nothing to worry about as it is reliably dispelled through the transmission oil cooler. Further, it should be noted that the 9G Tronic does not need an additional radiator to heat the transmission oil to a warmer temperature when you need to cold-start it in Arctic conditions.
Reliable oil supply using the power of two pumps
Another noticeable difference between the 9g Tronic and 7g Tronic is that the former has two pumps that ensure a reliable supply of engine oil. The main pump, which is significantly smaller, is installed off-axis and lies adjacent to the primary shaft. The mode of driving it is via a chain. In the older versions, for example, the 7G Tronic, the primary oil pump not only circled the transmission shaft but was also directly driven. The effect of this was that it prevented the pump diameter from being decreased in size as necessary. That is the reason the engineers now place the cell pump off-axis or alongside the main shaft. At the same time, there is a considerable reduction in the oil pump size to meet requirements.
The primary mechanical pump is backed up by a different electric auxiliary pump. The other benefit of this design is that it allows lubrication and coolant flow to be actively controlled on demand. At the same time, it also implies that the 9G-Tronic can take advantage of the start-stop system. The design is even more important in hybrid applications, where it allows “sailing”, which is where a constant speed is maintained even when the internal combustion engine is not used.
Switching off the engine causes the electric auxiliary pump to be actuated, something that ensures there is a definite basic pressure. Also, it guarantees that all the vital functions are on. When the driver powers on the engine, the delivery of oil to the electric pump after the starting of the engine guarantees not only immediate but also agile acceleration. In some operating states when the engine is on, the secondary pump helps the primary pump. Two instances are when the engine is at very low speeds or extremely high temperatures. In such cases, the oil flow is improved which ensures smoother gear shifts. Another instance is when higher oil flow may be needed where greater cooling is required.
This concept of innovative oil supply using both the primary and secondary pumps, plus demand-related control, leads to about 54% of the entire fuel efficiency of the 9G Tronic. The link is as clear as daylight: the less oil that needs moving within the transmission using more efficient pumps, the greater the overall efficiency. Another thing that contributes to this scenario is the presence of low-friction and fully synthetic fuel economy.
Conclusion
The introduction of the nine-speed gearbox disrupted the motor vehicle industry to levels never seen before. Part of the reason for this is the numerous advantages that the latest automatic transmission system brings. It offers improvements in nearly all aspects of its predecessor, the 7G Tronic. This gearbox is a lot better at conserving fuel and also shifts much more smoothly. Another thing worth noting is the dependable oil supply which uses two pumps. Whichever way you look at it, the 9g Tronic system outperforms its predecessor in almost all sectors.