Common Issues with RV Worm Gear Reducers

Release time:

2022-12-13

The RV worm gear reducer is a transmission mechanism characterized by its compact structure, large transmission ratio, and self-locking capability under certain conditions. It’s one of the commonly used types of reducers. Among them, the hollow-shaft worm gear reducer not only possesses the aforementioned features but also boasts convenient installation and a reasonably designed structure, making it increasingly widely adopted. When a hollow-shaft worm gear reducer is installed at the end of a worm gear reducer conveyor system alongside a bevel gear reducer, it can achieve extremely low output speeds. This combination of a bevel gear stage and a worm gear stage offers higher efficiency than a simple single-stage worm gear reducer. Moreover, it features low vibration, minimal noise, and reduced energy consumption. Next, I’ll introduce some common issues related to RV worm gear reducers!

　　1. Heating and oil leakage in RV worm gear reducers:

　　To improve efficiency, worm gear reducers typically use non-ferrous metals for the worm wheel and relatively hard steel for the worm. Since this is a sliding friction transmission, it generates significant heat during operation, causing thermal expansion differences between the reducer’s components and seals. This leads to gaps at various mating surfaces, making it easier for lubricant oil to leak as the temperature rises. The main reasons for these issues include: whether the material formulation is appropriate, the surface quality of the meshing friction surfaces, the selection of lubricating oil, and whether the amount of lubricant added is correct.

　　2. Wear of the worm gear in the RV worm gear reducer:

　　Worm gears typically use tin bronze, while paired worm shafts are generally made of 45 steel, hardened to an HRC of 45–155. Commonly, the worm shaft is made of 40C steel, which is hardened to an HRC of 50–155 and ground using a worm gear grinding machine to achieve a surface roughness of Ra 0.8 μm. During normal operation, the worm shaft continuously scrapes against the worm gear, much like a hard “gear,” thereby wearing down the worm gear. Generally, this type of wear is quite slow. For instance, some factory gearboxes can last over 10 years without significant wear. If wear occurs rapidly, it’s necessary to consider factors such as whether the gearbox was selected appropriately, whether it’s operating under overload conditions, the material of the worm gear, assembly quality, or the operating environment.

　　3. Wear of the small helical gears in the RV worm gear reducer:

　　This typically occurs in vertically mounted gear reducers and is primarily related to the amount of lubricant added and the type of lubricant selected. When installed vertically, the lubricant flow tends to be insufficient. When the reducer stops operating, gear oil can leak between the motor and the reducer, leaving the gears without adequate lubrication and protection. As a result, during startup or operation, the gears fail to receive effective lubrication, which can lead to mechanical wear or damage.

　　4. Damage to the worm gear bearing in the RV worm gear reducer:

　　When an RV worm gear reducer fails, even if the gearbox is well-sealed, the plant often finds that the gear oil inside the reducer has become emulsified, and the bearings have rusted, corroded, or been damaged. This is because, during periods of transportation downtime, moisture generated after the gear oil cools down from heat tends to accumulate. Of course, this issue is also closely related to the quality of the bearings and the assembly process techniques used. The above are common problems encountered with RV worm gear reducers. If you’d like to learn more, please feel free to contact me anytime!