How do lubrication methods differ between internal and external gear slewing drives?

Lubrication methods for vertical internal gear slewing drives differ from those used in external gear slewing drives due to variations in gear placement, load distribution, and exposure to environmental conditions.

1. Lubrication Accessibility & Containment

   • In vertical internal gear slewing drives, the internal gear is enclosed within the housing, providing better protection against contaminants such as dust, moisture, and debris. This design helps retain lubrication more effectively, reducing the frequency of maintenance.

   • In contrast, external gear slewing drives have exposed gears, making them more susceptible to dirt accumulation and requiring more frequent lubrication to prevent wear and corrosion.

2. Lubricant Distribution & Retention

   • The enclosed nature of vertical internal gear slewing drives allows for better oil or grease distribution, ensuring consistent lubrication across all gear contact surfaces. This reduces friction and enhances efficiency.

   • External gear slewing drives rely more on periodic lubrication, as the open structure can cause lubricant loss due to environmental exposure, leading to increased wear over time.

3. Lubrication Type & Application Method

   • Vertical internal gear slewing drives typically use grease lubrication with a high viscosity to ensure it remains within the gear enclosure for extended periods. Some applications may also utilize oil baths or automated lubrication systems to maintain optimal performance.

   • External gear slewing drives often require grease with additional anti-corrosion additives to withstand direct exposure to environmental conditions. The application process may involve manual greasing at regular intervals or the use of automatic grease dispensers.

4. Heat Dissipation & Performance Stability

   • The enclosed design of vertical internal gear slewing drives retains heat, which can affect lubricant viscosity over time. Proper selection of heat-resistant lubricants is essential to maintain long-term performance.

   • In external gear slewing drives, the open structure allows for better heat dissipation but may require lubricants with higher resistance to oxidation and evaporation due to constant exposure.

5. Maintenance Frequency & Service Life

   • Vertical internal gear slewing drives generally have longer maintenance intervals because their lubrication remains effective for an extended period, reducing the need for frequent reapplication.

   • External gear slewing drives, on the other hand, require more frequent inspections and lubrication replenishment to counteract the effects of environmental exposure and lubricant loss.