In a compression type automatic grease cup, what mechanism forces the lubricant into the bearing?

In a compression type automatic grease cup, the mechanism that forces the lubricant into the bearing is based on spring force. The grease cup is typically designed with a spring that is compressed as lubricant is added or upon usage. When the lubricating mechanism needs to deliver grease, the spring releases its stored energy, pushing the lubricant out of the cup and into the bearing without requiring external force or manual intervention.

This design is efficient because it ensures a consistent and regulated delivery of grease to the bearing, which helps maintain proper lubrication and reduces wear and tear on the mechanical components. The use of spring force provides a reliable and effective method for ensuring that bearings receive the necessary lubrication at appropriate intervals, promoting smoother operation and longevity of the machinery.