Electric Actuator Radial Axial Dimension Reduction
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Solution Overview
Problem
Existing electric actuators for vehicle braking devices face challenges in miniaturization due to separate radial and axial dimension constraints, leading to increased size and reduced mountability in limited spaces.
Innovation Solution
The electric actuator integrates the screw mechanism and rotation-stop mechanism on the outer periphery of the output member, allowing for a compact design that reduces both radial and axial dimensions, enabling miniaturization while maintaining functionality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If the rotation-stop mechanism and screw mechanism are separately provided concentrically, then the radial dimension increases, but the axial dimension can be maintained
Solution Approach 1:
The patent merges the rotation-stop mechanism and screw mechanism into a single integrated structure where the output member simultaneously forms both the screw part for linear motion conversion and the rotation-stop part for rotational limitation. This consolidation eliminates the need for separate concentric mechanisms, reducing radial dimension while maintaining functional complexity through a unified design
2Length of stationary object
If the rotation-stop mechanism and screw mechanism are separately arranged on the center axis line, then the radial dimension is reduced, but the axial dimension increases
Solution Approach 1:
The patent repositions the rotation-stop mechanism not along the axial direction but on the radial outer periphery of the output member, utilizing the radial dimension differently. By placing the rotation-stop part on the outer periphery rather than arranging mechanisms sequentially along the axis, the design achieves compactness in both radial and axial directions simultaneously
3Reliability
If separate rotation-stop and screw mechanisms are used, then functionality is maintained, but the overall device size increases
Solution Approach 1:
The output member is designed as a multi-functional component that simultaneously performs screw mechanism functions (converting rotation to linear motion) and rotation-stop mechanism functions (limiting rotation through engagement with the input member). This universal design allows a single component to fulfill multiple roles, reducing overall device volume while ensuring reliable braking functionality through integrated mechanical actions
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 mountability in narrow spaces by reducing the overall size of the electric braking device, effectively converting rotational power into linear power for efficient braking without compromising performance.
Implementation Method 1
a first screw part (Na) on an outer periphery (Mg) of the output member (BO) and a linear motion member (BH) having a second screw part (Nb) engageable with the first screw part (Na)
Data Source
AI summary
An electric actuator includes an input member that is rotationally driven by the electric motor and includes a first rotation stop part on an inner periphery, an output member that includes a second rotation stop part engageable with the first rotation stop part, and a first screw part on an outer periphery, and a linear motion member that includes a second screw part engageable with the first screw part. Both the screw mechanism and the rotation-stop mechanism are formed on the outer periphery of the output member. Therefore, in the electric actuator, the radial and axial dimensions are shortened.