Electromagnetic Locking Device Line Contact Wear Reduction
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Solution Overview
Problem
Existing locking devices with electromagnetic retaining means suffer from premature wear of surfaces and reduced reliability due to inadequate contact geometry, leading to potential inadvertent blocking and sensitivity to external pollution.
Innovation Solution
The locking device employs a line contact between the locking nose and retaining element with inclined ramps, providing a larger contact area that maintains functionality even after wear, and eliminates the need for elastic return means, simplifying the mechanism and reducing wear-related issues.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional surface contact is used between locking nose and retaining element, then initial retention force is sufficient, but wear occurs prematurely reducing reliability
Solution Approach 1:
The patent transitions from conventional surface contact to line contact by changing the geometry of the contact interface. The locking nose and retaining element are designed with complementary line contact surfaces that extend along the longitudinal axis, distributing wear along a line rather than a point or small area, thereby significantly increasing service life and maintaining reliability throughout the operating cycle.
2Duration of action of moving object
If line contact is implemented between locking nose and retaining element, then wear resistance increases, but manufacturing complexity increases
Solution Approach 1:
The patent achieves line contact through careful selection and adjustment of geometric parameters of the locking nose and retaining element. By modifying angles, radii, and dimensional tolerances within standard manufacturing capabilities, the design attains line contact without requiring complex machining processes or specialized manufacturing techniques, thus balancing wear resistance with ease of manufacture.
3Ease of operation
If elastic return means are included in the locking mechanism, then automatic return to locking position is achieved, but device complexity and potential wear increase
Solution Approach 1:
The patent removes elastic return means from the locking mechanism, simplifying the device structure. Instead, the design relies on the line contact geometry between the locking nose and retaining element, which provides self-guiding and automatic return functionality through its inherent geometric constraints, eliminating the need for additional elastic components and reducing overall complexity.
Solution Approach 2:
The line contact interface itself acts as an intermediary that provides the automatic return function. The geometric configuration of the line contact surfaces creates mechanical guidance that automatically returns the locking mechanism to its proper position without requiring elastic return means, thus simplifying the overall device while maintaining ease of operation.
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
The solution enhances wear resistance, reliability, and safety by minimizing the risk of inadvertent retention and external pollution, while allowing for easy operation and reduced energy consumption.
Implementation Method 1
electromagnetic retaining means ensuring the selective retention of the movable part on the main part
Data Source
Figure 1
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AI summary
The device (1) has a main part (2) comprising a releasable locking unit (12). The locking unit is selectively retained or released with a movement in a first direction (II-II) by an electromagnetic retaining unit (6). A mechanical retaining unit (7) is slidably mounted in a second direction (III-III). A locking nose (11) and a retaining recess (5) are arranged into contact with each another by a linear bearing. The linear bearing is extended over a third direction in which a plane is defined by the second direction and by a longitudinal axis.