Planetary GearBox
The process of adopting a planetary Gear.
We adopted a newly designed Planetary GearBox for our new SYSTEMA TRAINING WEAPON product. Since this gear system enables speed reduction in the same shaft as the drive shaft, a greater reduction ratio is realized. This is often used for tools such as electrical drills
The reason why we selected the planetary gear is not simply for the purpose of fitting in the narrow space of the lower receiver of a real gun, but to realize the higher transmission efficiency, and firm BOX. We cut down the reduction mechanism gear as the first task.
That is, we realized the simple idea of creating higher transmission efficiency by reducing one of gears among the bevel gear, spur gear, and sector gear.
An examination of the picture will make this obvious. Compared with the conventional reduction mechanism with three shafts, the planetary gear has only two shafts, allowing for a more compact mechanism. The planetary gear, which originally had three gears, was redesigned to have four in order to provide higher durability for the thrust load when using a high-rate spring.
Due to this effort, we succeeded in reducing to the greatest possible limit the backlash caused by the gears biting each other, resulting in realizing the best in transmission efficiency.
Next, the details of each part are explained as follows:
Realizing a durable reduction mechanism with a small module.
I. Reversed Idea
The Planetary gear usually reduces speed between the planetary gear and sun gear, fixing the internal gear to the case. However, turning it over, we fixed the planetary gear, which reduced the speed between the sun gear and internal gear, which is cut as sector gear. Thus, we managed to achieve a higher reduction ratio with only one gear. Since this is a quite unconventional mechanism, it requires a high order of processing for each part.
II. Tally size of each part.
The tally size of the gear and shaft is the key to realizing extreme precision and a stable gear revolution inside of GearBox. We adopted an tally for all shafts and bearing holes in this GearBox. This tally is the ideal value for fitting in the clearance; however this requires extremely high precision, which may mean that many people will choose not to adopt it due to the cost. our motto to have a wide limitation as wide as possible for ideal, and this will be a typical example to prove it.
III. Module
The value of a module is the standard pitch divided by ƒÎ, which simply means the size of each gear tooth. That is, the greater the value, the bigger and the more durable the gear. Conventionally, the module value for transmission is 0.8mm, and the value for the rack gear and sector gear is 1mm for electric gun.
In the process of SYSTEMA gear production, we adapted a helical gear because it makes less noise and has a higher transmitting effect. Then, we succeeded in producing a high-durability gear set with 0.5 modules, as taking a helix angle of 45 degrees. The smaller module gear set is essential to realizing a compact GearBox. We took the advantage of the knowledge that we gained in the production of a helical gear set, and produced a gear set with 0.5mm of the standard module.
IV. Application of shifted gear
When producing a gear set with the gear ratio that is needed for the wheel-base of gears biting each other, as well as when it is a standard gear, the one tooth sometimes gets undercut, thinning out the base of the tooth and causing trouble in producing a durable gear. Utilizing advanced manufacturing skills, we have produced many gear sets in various gear ratios in what is called a shift in the same wheelbase. We adopted this skill and produced durable gears, decreasing the under cut to the limit. Since only we manufacture gears managing the value ( the addendum modification coefficient), if other companies try to produce them taking the same structure, manufacturing process, material, and hardening, they won't be able to produce items as precise and durable without the value. Of course, the same thing can be said of conventional SYSTEMA parts.
V. Choice of material
The best material for making gears is chrome molybdenum steel, as its hard surface and internal high viscosity is ideal for gears that should wear down. However, the material is quite difficult to mill and very expensive. Our ideal: That the GearBox never breaks. Because of the structure that a sector gear intermittently cuts the connection with a rack gear, avoid the timing lag is inevitable. However, since we claim our product to be a Training Weapon System, it must not be unusable or damage the whole GearBox, Then we specified a piston rack in the cylinder set as the part to be damaged, which realized a quick exchange.
Therefore, it was necessary to have highly durable structure in the GearBox. In this case also, the cost is secondary to us, and we had no hesitation in selecting the ideal material.
VI. Hardening
Hardening is a processing to make the material stronger by heating a metal, and is one of the methods used to produce electrical guns parts. All the more for the above stated chrome molybdenum steel, since it is impossible to apply carburizing and quenching for this material. Though we cannot give a specific value of hardening temperature here, the value that we solved with a continuous process of trial and error is strictly managed, and our effort to minimize the variation caused by production lot was tireless.
Even if it looks to be just another, our know-how is behind the production.
VII. Bearing plate
As mentioned above, the planetary gear is fixed to the GearBox. However the problem was that this fixing shaft is normally designed as what is called cantilever in that it must be designed to fix only on one side. Then, we strictly managed the circumference of sun gear, addendum circle, and inserted radial bearing. We also designed a fixing part around this bearing for a shaft that supports the planetary gear. This Bearing Plate part supports the bearing. Adding this part, both the GearBox and bearing plate support four planetary gears, with an effect that other gears take the thrust load to the sector gear. Even if the design is excellent, manufacturing skill is required to make the product, unless it remains nothing but pie in the sky. This part, called a shaft hole at the rate of 90.4 degrees, is extremely difficult to design, as is the design of a center hole for the press fitting bearing. In addition, this material is so difficult to cut that doing do may be considered a spectacular feat. Given the extreme difficulties in processing this part, the quantity of monthly production is limited.
Given our innovative approach, in addition to the high skills required to realize the concept as a product, this rare collaboration enables us to deliver our product into our customers' hands.
VIII. A motor with a short shank
We belive that transmission efficiency is the key for reduction mechanism of gears. The same thing can be said of the motors that we designed and produced for this series. I would like to introduce the motor shaft, and I will explain the details of motor property later.
In designing the motor, we decided to place the bevel gear and pinion gear as close as possible to the motor body. This is to avoid a lowering of transmission efficiency due to shaft distortion, caused by 30,000 revolutions per a minute.
Therefore we took into special consideration the design of an ejector size short, since it was impossible to widen the shaft's external size.
As a result, we managed to realize a stable high revolution, as well as achieving the secondary advantage of a sharp decrease in the noise of a bevel gear, a feat which was considered to be impossible.
IX. The most important thing (Production of the case)
Needless to say, the mesh precision of gears depends on the precision of the case, into which the gears are finally put. It is generally known that it’s more difficult to produce an extremely precise case than to produce an extremely precise gear. However, it was somewhat natural to unwillingly compromise in selecting die-casting as a production process for the case this time, because the precision limit of die-casting is universally 3/100.However, the manufacturing industry in Japan is so established that I could fortunately was able to find a master. As the master says, our design method was still artless in terms of precision management. The completed production that was produced was based on the master drawing, rather than the client, and as such was an artistic one. When I first saw every shaft press fitted as designed, and the gear revolving without any stagnation, I was very impressed with it.
Before long, this will be in your hands.
X. Selection of Gear ratio
We intentionally produced only one type of gear ratio for the following reason. The gear ratio is a little lower than the conventional Super Torque Up Gear set, and the necessary safety margin acquired. As a result, the revolution of gear set is almost the same as that of a real gun; however we fixed a 9.6V battery as standard in order to maintain the general revolving speed of a toy gun. While increasing the weight by establishing a high voltage battery as standard may be considered a drawback, the product was designed to have almost the same body balance as a real gun, and we guarantee that it won’t be trouble at all. Rather, we designed according to the merit of being free from complicated gear exchange as important, by taking only one gear ratio. In addition, there is no need to adjust shims in using this GearBox, which we had so many questions about when installing conventional SYSTEMA parts. Also, the grease exchange cycle became longer due to an internal gear and adopting concealed structure for inside the planetary gear. Since the viscosity of grease is a little firm at first, it needs to be revolved sometimes.
However you will greatly enjoy the ultra smooth revolution with a low gear ratio after the grease agitated inside the internal gear and spread as a lubricant.
You will feel the smoothness most when shooting semi-automatically, of which the starting moment is the most important.
Advance use (Spring rate and tuning of battery voltage)
We don’t ignore the possibility of advance use after purchasing of SYSTEMA parts. The conventional tuning diagram goes something like this: Since the safety margin must be maintained and the battery automatically selected due to space capacity, the result is that a specific gear set is automatically selected after once you select the spring that you need. However the above sketch has not been applied to this product.
The diagram for this product is that the battery capacity deals with the spring exchanging, with a fixed motor torque and gear ratio of GearBox. Just like the field strip of a real gun, you can exchange a spring by pushing and drawing the takedown pin. Be prepared with enough batteries and some types of cylinder units, and then it will meet any situation quickly. Therefore, this system has a very high completion rate with action use. How is the high completion of the new GearBox by SYSTEMA, recognized manufacturer of high-precision gears? We are confident that you will be completely satisfied.
* * *
მდაა.... მომინდა...
http://www.systema-ptw.com/Promo/ მაგრამ იმხელა ფასი აქვს..
* * *
რა მაინტერესებს, Systema M16A3 MAX და Systema M16A2 MAX-ს შორის რა სხვაობაა? საიტზე ფასი ერთნაირი აქვთ.
Racing is life. Anything that happens before or after is just waiting.