Electric Linear Actuator with Asymmetric Coupling Members
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Solution Overview
Problem
Conventional electric linear actuators used in output shaft vibration-type electric devices face inefficiencies due to uneven load distribution across magnetic blocks, leading to inappropriate spring constants and reduced driving efficiency.
Innovation Solution
The electric linear actuator incorporates a design with a fixed block, output movable block, counter movable block, projecting side coupling member, retracting side coupling member, and block coupling member, where the output movable block and counter movable block reciprocate in opposite phases, and the coupling members have different shapes and spring constants to balance loads, ensuring optimal electromagnetic force application.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional electric linear actuators use uniform coupling members for magnetic blocks, then the structure is simple, but the load distribution becomes uneven and driving efficiency decreases
Solution Approach 1:
The patent applies local quality by configuring different coupling members for different magnetic blocks based on their specific load requirements. The first and second magnetic blocks have different spring constants (K1 and K2) to match the uneven load distribution caused by the output functional member's position, optimizing driving efficiency for each location rather than using a uniform design
Solution Approach 2:
The coupling members are segmented into different types (first coupling member and second coupling member) with different spring constants to handle different load conditions. This segmentation allows each coupling member to be optimized for its specific position and load characteristics, resolving the contradiction between simplicity and efficiency
2Volume of moving object
If the output functional member is positioned asymmetrically relative to magnetic blocks, then the actuator can be more compact, but load distribution becomes uneven leading to inappropriate spring constants
Solution Approach 1:
The asymmetric positioning of the output functional member is compensated by applying local quality through different spring constants for different coupling members. The first magnetic block closer to the output functional member receives a coupling member with spring constant K1, while the second magnetic block receives a coupling member with spring constant K2, ensuring proper load distribution despite the asymmetric compact configuration
Solution Approach 2:
The uneven load caused by asymmetric positioning is counterbalanced by adjusting the spring constants of different coupling members. The coupling members with different stiffness values compensate for the asymmetric load distribution, maintaining reliability while allowing the compact asymmetric design
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 driving efficiency by balancing loads and reducing unwanted vibrations, resulting in improved performance of the electric linear actuator and output shaft vibration-type electric devices.
Implementation Method 1
supplying current to the coil 933 to reciprocate the two magnetic blocks 934 in opposite phases
Implementation Method 2
The projecting side coupling member and the retracting side coupling member have different shapes, wherein each of the projecting side coupling member and the retracting side coupling member has a spring constant
Data Source
Figure 1
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AI summary
This electric linear actuator (40) comprises a fixed block (50), an output movable block (60), a pair movable block (70), a projection-side connecting component (80), a retraction-side connecting component (90), a block coupling component (100), and an output functional component (200). By means of the electromagnetic force between the fixed block (50), the output movable block (60) and the pair movable block (70) reciprocate in the movable direction (DX) in mutually opposite phases. The projection-side connecting component (80) is coupled with the output movable block (60) and the pair movable block (70). The retraction-side connecting component (90) is coupled with the output movable block (60) and the pair movable block (70). The projection-side connecting component (80) and the retraction-side connecting component (90) have mutually different shapes.