Fuel Injection Valve Movable Core Collision Control

The patent introduces a damper member that creates a damper force to cushion the movable core's movement before it reaches the fixed core. The damper force increases as the movable core approaches the fixed core, reducing the collision speed and preventing damage while allowing rapid valve opening when needed.

The damper member acts as an intermediary between the movable core and the fixed core. It mediates the interaction by providing a controlled resistive force that manages the kinetic energy of the movable core, preventing direct high-speed collision while maintaining the magnetic attraction force's effectiveness.

The damper member provides beforehand cushioning by generating a damper force that increases as the movable core approaches the fixed core. This cushioning effect prevents the cores from colliding even when the gap is small, allowing the magnetic attraction force to be maximized without compromising reliability.

The patent changes the parameter of the gap distance between the attracting surface and attracted surface to an optimal small value to maximize magnetic attraction force, while simultaneously introducing the damper member to control the dynamic behavior and prevent contact damage, thus resolving the contradiction.

The damper member serves as an intermediary that does not significantly hinder the movable core's rapid movement during normal operation, but actively intervenes to reduce collision speed when the core approaches the fixed core. This maintains productivity while eliminating harmful collision wear.

The damper force parameter dynamically changes based on the position of the movable core. When the core is moving rapidly toward the fixed core, the damper force increases to reduce collision speed, while during normal operation the damper force remains minimal to maintain fast response.