The first thousand four hundred and thirty-eight chapters use the T-72 gearbox
Now, the mainstream internationally is a hydraulic transmission transmission. If you don’t have a hydraulic transmission system, you will be embarrassed to go out to see people. However, the structure of this transmission is complex and takes a long time to overcome it. Moreover, even if it is manufactured, it is a very difficult time to overcome it.
Once it comes out, in the early stage of use, it will also encounter various problems due to immaturity.
The mainstream domestically is still a fixed shaft transmission. This kind of transmission has a simple structure, with an input shaft and an output shaft. The two shafts are covered with different gears. Different speed ratios are obtained by choking between different gears.
, almost a method adopted since the car has a gearbox.
Simple structure, strong and durable are all its advantages, but large size, insufficient torque that can be transmitted, etc. are all its defects.
Tanks produced by major Eastern powers have always been improved from the technology of the 59 tank. Even the Type 85 tank uses this mechanical fixed shaft gearbox, which has a spur gear inside. After the power is output from the engine, it will be
Enter the gearbox and then pass through the secondary planetary steering clutch on both sides to complete the steering task.
The current third-generation tanks can no longer use the same method. This backward transmission cannot bear the power output of 1,200 horsepower. The stronger the torque, the larger the gears required, so it will cause
The size of the gearbox is too large. On the other hand, the gears become larger and larger, and the inertia will become stronger and stronger. This will cause strong teething results when shifting gears, affecting the life of the gearbox.
What should I do if I can’t use the hydraulic transmission system when I reach a power of 1,200 horsepower?
Qin Zhenhua gave a solution, and we might as well borrow the transmission device of the T-72 tank!
Over the years, tank engineers from major Eastern powers have thoroughly studied the T-72 tanks and have actually praised many of the designs above, including its double-sided planetary gearbox!
Soviet tanks, from T-54, T-55 to T-62 tanks, used fixed shaft transmissions, but when they developed to T-72 tanks, Kartsev realized that they could not continue to use them.
The same type of transmission system will simply enlarge, which will make the performance of the T-72 tank worse, so they developed this unique double-sided with functions such as speed change, steering, braking and cutting power.
Transmission structure.
As the name suggests, a double-sided transmission means that there is a transmission on both sides of the tank. What are the benefits of this? Of course, it greatly reduces the strength requirements for the transmission.
Take the T-72 as an example. It uses a 780-horsepower diesel engine. If you use a fixed shaft gearbox, all the power must be transmitted to this gearbox, but now it has become two.
Each unit only needs to share 390 horsepower, which greatly reduces the power demand of the gearbox. It can have a smaller size and better reliability!
This can be compared. Compared with the fixed shaft transmission used by tanks in the Soviet Union before, the transmission device has reduced weight, but it has transferred more power requirements of 50% and has greatly improved the transmission performance!
For the Eastern power, it is very difficult to build a gearbox that can transmit 1,200 horsepower. Even if it can be made, the volume is quite large. However, if you follow the example, you can use the T-
Take the -72 transmission and get two side gearboxes. On one side, you only need to bear 600 horsepower. In this way, the difficulty will be greatly reduced. It can be said that it is improved and
Just strengthen it.
Moreover, this kind of gearbox has another advantage. When steering, the two tracks can be switched to different gears.
In the past, there was only one gearbox, and the power output was determined. The tracks on which side were steering were controlled to slow down or stop, but it was impossible to reverse the tracks.
It's different now. There are gearboxes on both sides, so if you want to be in the limit, you can turn the tracks on both sides in reverse while placing the gears on both sides, and you can even realize the ability to turn the center.
Of course, this operation is too complicated. Even the T-72 is often used to hang gear on one side and completely brake on the other side. The steering radius is between half the center distance of the track to infinity
Change. It has seven forward gears. Except for the first gear and reverse gear, when steering the other second to seven gears, the gearbox on the steering side is generally lowered by one gear, and the steering side is opposite to maintain the original gear.
, this way, the steering is carried out through the speed difference.
In short, although it is not as good as the hydraulic transmission system, the T-72 tank's double-sided transmission is still remarkable. Its structure is also simple, and it belongs to the 3-degree-of-freedom planetary type, with 4 planetary rows.
The only problem with 6 operating parts is that when moving straight, you must ensure that the gearboxes on both sides are mounted at the same gear at the same time, so there must be no omissions, otherwise such tanks cannot go straight. Soviet engineers specially set it up.
A special valve core synchronization mechanism for the left and right control valves is implemented. The driver uses the manual hydraulic control system to keep the transmissions on both sides in the same gear at the same time.
In the past, Qin Zhenhua once made a suggestion that since the hydraulic transmission system was purchased from outside, in order to avoid being choked by foreigners, his side should have a backup plan. At that time, Qin Zhenhua suggested using the double-sided planet of T-72.
The transmission solution is, however, because the tank design is limited by time and is looking forward to the opportunity to be displayed in the 8910 project, so it was only a simple research and did not enter the practical stage in detail.
"I'm afraid there's something wrong with this." After hearing Qin Zhenhua's suggestion, a technician said: "The engine of the T-72 tank is horizontal, so there are output shafts on both sides, which are directly transmitted to the gearboxes on both sides, but,
Our engine is longitudinally positioned, and the transmission shaft is in the front and rear directions, so I am afraid it cannot be arranged."
It is inconvenient to borrow it directly. One is a transverse engine and the other is a longitudinal engine. How to do it?
"So you have to add a fixed gear box." Qin Zhenhua said: "At the back of the engine, add a fixed gear box, and you can use a bevel gear or a turbine inside. Turn the longitudinal power into a horizontal direction and then pass through
The transmission shafts on both sides can drive the planetary gearbox on both sides. This adds a fixed gearbox and can also reduce the speed in advance, eliminating the reduction mechanism from the gearbox to the track."