What are airsoft gearbox parts?
Gearbox parts are at the heart of your automatic electric airsoft gun (AEG). The parts work together in harmony to make a clean and hard shooting airsoft gun. The first gearbox was developed by Tokyo Marui in 1992. The original AEGs were only designed to shoot between 280 and 300 fps. When trying to stretch the velocity out of a gun, it required upgraded internal components to withstand the stress of increased loads. In today's market, most AEGs are shooting between 380 - 400 fps out of the box with good internal components. With the good components readily available today, they still do require replacement and maintenance over time. If you are considering upgrading or repairing your internal components, make sure you feel comfortable doing this type of work. If it isn't something you're comfortable attempting, talk to one of our expert techs at Fox Airsoft.
There are a variety of internal parts in your gearbox, and it's good to have an understanding of all of them so you can understand their purpose. The gearbox is leveraging an electrical motor in order to drive a piston back and forth. The piston then compresses the air rapidly to launch the BB out of the barrel at the desired velocity. If you follow the transfer of energy, the first step is having a power source, this comes from your airsoft battery. The battery then follows the wires to a breaking point where the trigger lives. Trigger switches are housed inside their respective gearboxes. Switches may be mechanical or electrical depending on the airsoft gun. Once the switch is triggered, this transfers electrical energy to your motor which begins to spin. As the motor spins, the energy is transferred through the gear set or drive train in the system. There are 3 gears in most airsoft gun gearboxes: Spur, Bevel, and Sector gear. The sector gear is the last gear in the chain and has gear teeth on only 1/2 of it's circumference. These teeth allow the piston to cock back and once the teeth run out, the piston is released forward. Behind the piston are a stiff spring that is rated to achieve the desired velocity. This spring is seated against a spring guide to ensure it doesn't move out of position. The piston has a head on it with an o-ring designed to seal for good compression. Many piston heads feature ports that allow the o-ring to expand when the piston moves forward creating a tighter seal and more pneumatic efficiency. As the piston head moves forward it is traveling through a cylinder and then stops at the cylinder head. The cylinder head has a cylindrical port that the nozzle seats on. The nozzle moves back and forth to load BBs into the Hop Up Chamber. The nozzle's movement is synced with the sector gear via a tappet plate. This is the basic operation on a standard gearbox.
Q & A
Q: Will changing my gears make my airsoft gun shoot at a higher velocity?
A: No. Changing gear ratios can affect the speed at which the airsoft gun fires, you can also buy increased strength gears that will withstand greater stresses if installing a larger spring.
Q: Do I need a new cylinder?
A: The cylinder is where your compression occurs. You need to look at a few components to maximize pneumatic efficiency: Nozzle, Cylinder Head, Cylinder and the piston head. The combination of these components done correctly can make a tremendous difference on the efficiency of the airsoft gun.