Solenoid Geometry for Stable Shock Absorber Thrust Force
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Solution Overview
Problem
Existing damping force adjustable hydraulic shock absorbers face challenges in securing stability and controllability of thrust force due to equal axial distances between convex portions of the stator and mover, leading to inconsistent force peaks during the stroke of the mover.
Innovation Solution
A solenoid with a coil wound into an annular shape and a stator featuring outer and inner peripheral convex portions is designed, where the axial distance between the outer peripheral convex portion and the mover is smaller than the inner peripheral convex portion when no current is applied, enhancing the stability and controllability of thrust force.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If equal axial distances are set between convex portions of stator and mover, then the structure is simple and manufacturing is easier, but the thrust force stability and controllability deteriorates due to inconsistent force peaks
Solution Approach 1:
The patent applies asymmetry by setting different axial distances between the outer peripheral convex portion and inner peripheral convex portion of the stator relative to the mover. Specifically, the axial distance from the outer peripheral convex portion to the outer peripheral portion of the mover is made smaller than the axial distance from the inner peripheral convex portion to the inner peripheral portion of the mover. This asymmetric configuration creates distinct force generation characteristics at different radial positions, enabling stable and controllable thrust force while maintaining manufacturing feasibility.
2Reliability
If axial distance between outer peripheral convex portion and mover is made smaller, then thrust force stability improves, but the structural design becomes more complex
Solution Approach 1:
The patent applies local quality by creating different axial distances at different radial positions of the stator. The outer peripheral region has a smaller axial distance between the outer peripheral convex portion and the mover, while the inner peripheral region maintains a larger axial distance. This localized variation in geometric parameters optimizes thrust force stability at critical regions without requiring complex overall structural changes.
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
This configuration ensures stable and controllable thrust force by adjusting the axial distances between convex portions, improving the performance of damping force adjustable shock absorbers.
Implementation Method 1
a coil wound into an annular shape and configured to generate magnetic force by being energized
Data Source
AI summary
A solenoid including a molded coil, an anchor, and an armature. In the anchor, an outer peripheral convex portion and an inner peripheral convex portion are formed. When no current is being applied, axial distance between the outer peripheral convex portion of the anchor and an outer peripheral portion of the armature which is radially closest to the outer peripheral convex portion is smaller than axial distance between the inner peripheral convex portion of the anchor and an inner peripheral portion of the armature which is radially closest to the inner peripheral convex portion. In other words, timing at which the outer peripheral convex portion of the anchor and the outer peripheral portion of the armature face each other in a radial direction is shifted from timing at which the inner peripheral convex portion of the anchor and the inner peripheral portion of the armature face each other in the radial direction.