A device mounted on the elevator car frame that automatically applies a controlled film of lubricant to the guide rail running surfaces as the car travels, reducing friction and wear.
Full Definition
Rail lubricators (also called automatic rail oilers or guide rail lubricating devices) are fitted to the car guide shoe mounting on the car frame. As the car travels, a felt pad, roller, or brush applicator in contact with the rail face deposits a metered film of oil or grease. Lubricant types include mineral oil (ISO VG 68–100), semi-fluid grease, and dry PTFE-based lubricants for environments sensitive to oil contamination. EN 81-20 clause 5.7.2 prohibits the use of oil or grease on safety gear rail contact zones; lubricators must therefore not apply lubricant to the section of rail where the safety gear jaws engage. Maintenance includes checking the lubricant reservoir level and ensuring uniform distribution along the rail. Over-lubrication increases contamination risk; under-lubrication accelerates rail and guide shoe wear. Automatic lubricators reduce maintenance frequency and improve ride quality.
