What is the appropriate oil level for a gearbox?

Specific operation steps

Check the oil level:
First, locate the oil dipstick or oil sight glass on the gearbox. The dipstick is typically found in the engine compartment, while the sight glass is a transparent window on the gearbox housing.
Pull out the dipstick, wipe it clean with a clean paper towel or cloth, then reinsert it and pull it out again to check whether the oil level is within the proper range.
For gearboxes equipped with an oil‑level sight glass, simply check whether the oil level is centered in the sight window.

Refueling procedure:
If the oil level is below the recommended range, lubricant must be added. When topping up, use only the lubricant grade specified for the gearbox and avoid mixing different types of lubricants.
Use appropriate refueling tools, such as a funnel, to prevent oil from splashing and air from entering the fuel tank.
During refueling, add the oil slowly while monitoring the oil level until it reaches the proper position.

Precautions

Avoid too much or too little:
When refueling, avoid overfilling or underfilling. Overfilling may cause oil to spill or foam, compromising lubrication; underfilling can lead to insufficient lubrication of gears and bearings, accelerating wear.

Regular inspection and replacement:
The reducer should have its oil level and oil quality checked regularly, with lubricant replenished or replaced as needed. For newly manufactured reducers, the oil should be changed after the first 100 hours of operation; thereafter, change the oil every six months (or in accordance with the operating manual).

Keep it clean:
Before refueling, ensure that both the fuel tank and the refueling equipment are clean to prevent dust and contaminants from entering the fuel. Such impurities can accelerate fuel degradation and may lead to malfunctions.
Principle of Explosion-Proof Functionality

Explosion-proof motor selection:
The reducer is equipped with an explosion-proof motor, such as an explosion‑proof type or an increased safety type. An explosion‑proof motor, with its specially designed enclosure and sealing structure, prevents sparks or thermal effects from igniting surrounding gases or vapors in explosive atmospheres. An increased safety motor, on the other hand, avoids igniting external explosive mixtures by limiting internal temperatures.

Sealing Design:
The design of the reducer incorporates robust sealing measures to prevent flammable substances from entering its interior. This includes the use of high‑quality sealing materials and structures, ensuring that all moving parts are effectively sealed and thereby minimizing the impact of external explosive atmospheres on the reducer’s internal components.

Explosion-proof rating:
Gear reducers and electric motors must comply with specific explosion-proof rating requirements, such as the ATEX Directive or IEC Ex standards. These standards take into account the presence, duration, and ignition energy of explosive atmospheres, as well as the equipment’s protection level, ensuring that the gear reducer can operate safely in the specified environment.

Material selection:
Select materials that are resistant to corrosion and chemicals to prevent internal corrosion and damage within the gearbox. This helps minimize potential sparks or heat sources, further reducing the risk of explosion.

Safety Emission System:
In certain cases, gearboxes may require a safety venting system, such as the installation of pressure relief valves. These systems can promptly release excess internal pressure when it exceeds safe limits, thereby preventing equipment damage or potential fires.

Principle of the power-off braking function

Electromagnetic de-energized brake:
Power‑off brakes typically employ electromagnetic de‑energized brakes, also known as safety brakes. When the electromagnetic coil is energized, an electromagnetic force pulls the armature, separating it from the brake disc and allowing the drive shaft to rotate or start normally. When the coil is de‑energized, a spring presses against the armature, generating a frictional torque between the brake disc, the armature, and the flange, thereby bringing the drive shaft to a rapid stop.

Working principle:
When energized, the electromagnetic force overcomes the spring force, keeping the brake released. When the power is cut or the drive system is disengaged, the electromagnetic force vanishes, and the spring force engages the brake, bringing it to a rapid stop.

Application scenarios:
Power‑off brakes are primarily used in applications requiring rapid braking and precise positioning, such as printing, light industry, lifting, textile, electric motor equipment, and automated control systems.

In summary, the explosion-proof and power‑off braking functions in gear reducers are achieved through specific design and technical measures, ensuring safe operation and reliable performance under particular environmental conditions.