Electromagnetic Actuator Integrally Molded Stopper for Vibration Damping
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Solution Overview
Problem
Existing active vibration damping devices with electromagnetic actuators face issues of excessive displacement leading to noise and damage due to lack of effective shock absorption and sealing, increasing the number of components and reducing productivity.
Innovation Solution
An electromagnetic actuator with an integrally molded stopper mechanism that combines sealing and displacement limiting functions using a rubber elastic body with a ring-shaped sealing unit, first stopper unit, and second stopper units, providing a compound stopper effect and fluid-tight sealing with fewer components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a rubber sheet for shock absorption is placed on the inner surface of the housing, then the movable member's striking against the housing is reduced, but the shock absorption is insufficient when large shock load is applied and the rubber sheet deteriorates due to repeated striking
Solution Approach 1:
The patent combines the sealing function and stopper function into a single integrated stopper component. The stopper includes a sealing portion with an O-ring for fluid-tight sealing and a stopper portion with a stopper protrusion that limits the displacement of the movable member. This integration eliminates the need for separate rubber sheets and sealing components, providing both sufficient shock absorption and durable sealing capability.
Solution Approach 2:
The stopper protrusion is pre-positioned to limit the displacement of the movable member before excessive striking can occur. By providing this preliminary displacement limitation, the system prevents the movable member from striking the housing with excessive force, thereby protecting the rubber sheet from deterioration while maintaining effective shock absorption.
2Reliability
If a separate O-ring sealing is installed at the adjustment hole, then fluid-tight sealing is achieved, but the number of components increases and productivity decreases
Solution Approach 1:
The patent integrates the sealing function into the stopper component itself. The sealing portion of the stopper includes an O-ring that provides fluid-tight sealing at the adjustment hole. By combining the sealing function and stopper function in one component, the number of parts is reduced and assembly is simplified, improving productivity while maintaining reliable sealing.
Solution Approach 2:
The stopper component serves multiple functions: it provides displacement limitation through the stopper protrusion, fluid-tight sealing through the O-ring at the sealing portion, and structural support. This multi-functionality eliminates the need for separate sealing components, reducing part count and assembly complexity while maintaining all required functions.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Effectively limits excessive displacement and prevents noise and damage, while improving operation stability and durability by using a single part for both sealing and stopper functions, reducing the number of components and maintaining productivity.
Implementation Method 1
an integrally molded stopper which is formed of a rubber elastic body
Implementation Method 2
Upon energizing the coil, drive force is generated in the axial direction between the stator and the movable member
Data Source
AI summary
An electromagnetic actuator having: a stator and a movable member disposed in a central hole of a coil member of the stator movable in an axial direction; a coupling rod fixed to the movable member; and an elastic stopper having a ring shaped sealing unit at its outer periphery part, a first stopper unit at its center part, a coupling unit that mutually couples the sealing unit and the first stopper unit, and second stopper units located radially between the sealing unit and the first stopper unit at respective circumferential positions. The sealing unit is compressed between the bottom wall of a housing and a lid member to form a sealing mechanism that fluid-tightly close an opening of an adjustment hole. The first stopper unit axially faces the coupling rod bottom with a first separation distance, and the second stopper units axially face the movable member bottom with a second separation distance greater than the first.