Shock Absorber Movable Iron Core Segmentation
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Solution Overview
Problem
The existing electromagnetic damping force adjustment devices in shock absorbers face challenges in achieving excellent dynamic characteristics when the movable iron core is displaced, particularly in terms of damping force adjustment and fluid flow efficiency.
Innovation Solution
A damping force adjustable shock absorber is designed with a solenoid-driven damping force adjustment valve, featuring a movable iron core with a thick cylindrical portion and a taper cylindrical portion, along with a communication passage and recessed portions to facilitate fluid flow and magnetic flux transfer, ensuring efficient displacement and dynamic performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional electromagnetic damping force adjustment device is used, then the damping force can be adjusted, but the dynamic characteristic when the movable iron core is displaced is poor
Solution Approach 1:
The movable iron core is divided into two distinct portions: a thick cylindrical portion that axially faces the fixed iron core for magnetic flux transfer, and a taper cylindrical portion that axially extends toward the other end for fluid flow. This segmentation allows each portion to be optimized for its specific function, improving dynamic characteristics while maintaining structural efficiency.
Solution Approach 2:
Different portions of the movable iron core are given different geometries and properties: the thick cylindrical portion provides a larger cross-sectional area for effective magnetic flux transfer, while the taper cylindrical portion with its flared inner peripheral surface creates a flow passage for hydraulic fluid. This local differentiation of properties optimizes both magnetic and fluid functions simultaneously.
2Force
If the movable iron core is made thicker to improve magnetic flux transfer, then the magnetic force increases, but the displacement speed and dynamic response deteriorate
Solution Approach 1:
The iron core is segmented into thick and taper portions, allowing the thick portion to maximize magnetic flux transfer area while the taper portion with its flow passage minimizes fluid resistance during displacement, thereby maintaining both high magnetic force and fast response speed.
Solution Approach 2:
The hydraulic fluid acts as an intermediary that lubricates and facilitates the displacement of the movable iron core. The flow passage through the taper cylindrical portion ensures smooth fluid flow during displacement, reducing friction and enabling rapid movement despite the increased thickness of the magnetic portion.
3Productivity
If a flow passage is provided in the shaft portion, then the hydraulic fluid can flow smoothly, but the structural strength and precision may be compromised
Solution Approach 1:
The flow passage is localized to the taper cylindrical portion of the movable iron core, where it is least likely to interfere with the critical magnetic flux transfer path through the thick cylindrical portion. This localized approach maintains structural precision in the magnetic circuit while enabling smooth fluid flow where needed.
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 enhances the dynamic characteristic of the movable iron core by optimizing fluid flow and magnetic flux transfer, allowing for adjustable damping forces and improved shock absorption efficiency.
Implementation Method 1
a coil configured to generate a magnetic force by power supply
Implementation Method 2
a flow passage configured to cause the hydraulic fluid to flow therethrough due to extension and compression of the piston rod
Implementation Method 3
a damping force adjustment valve provided in the flow passage and configured to be driven by a solenoid
Data Source
AI summary
A damping force adjustable shock absorber in2cludes an electromagnetic damping force adjustment device (17) having a damping force adjustment valve (18), and a solenoid (33) configured to variably adjust the damping force. The solenoid includes a coil (39) configured to generate a magnetic force by power supply, a movable iron core (43) located on an inner peripheral side of the coil, an anchor member (40) configured to attract the movable iron core. The movable iron core includes a thick cylindrical portion (43A) and a taper cylindrical portion (43B). The thick cylindrical portion includes a fixation hole (43A1) in which a shaft portion (44) is fixed. The taper cylindrical portion has an inner peripheral surface flaring so as to define a taper shape. A recessed portion (43A2) is formed around the fixation hole. The recessed portion allows hydraulic fluid to flow in an axial direction of the movable iron core.