Electromagnetic Clutch Flat Spring Blocking Member
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Solution Overview
Problem
Existing electromagnetic clutches face challenges in preventing the intrusion of foreign objects into the gap between the armature and pulley due to overlapping through-holes, which can compromise the clutch's operational reliability and efficiency.
Innovation Solution
The introduction of a blocking member that closes at least a portion of the secondary through-hole in the flat spring, preventing foreign objects from entering the gap between the driven-side and driving-side rotatable bodies, thereby enhancing the clutch's sealing and operational reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If through-holes are formed in the flat spring to enable resilient deformation, then the ease of manufacture and operational flexibility is improved, but the reliability deteriorates due to foreign object intrusion through the through-holes
Solution Approach 1:
The through-hole is divided into two functional parts: an upper portion that remains open to allow resilient deformation of the flat spring, and a lower portion that is blocked by the blocking member to prevent foreign object intrusion. This segmentation enables the single structure to simultaneously achieve both ease of manufacture and reliability.
2Ease of operation
If through-holes are formed in both the flat spring and armature, then the ease of operation and magnetic flux partitioning is improved, but the reliability deteriorates due to overlapping through-holes creating intrusion pathways
Solution Approach 1:
The blocking member is positioned specifically at the lower portion of the through-hole where foreign object intrusion occurs, while leaving the upper portion open to maintain magnetic flux partitioning functionality. This local quality modification allows the structure to simultaneously achieve ease of operation and reliability by applying different properties to different locations of the same structure.
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 blocking member effectively reduces the likelihood of foreign object intrusion, improving the clutch's reliability and maintaining the integrity of the magnetic circuit, ensuring consistent performance and extended lifespan.
Implementation Method 1
when an electromagnetic coil is energized, an attractive force in a form of an electromagnetic force is exerted between the armature and the pulley
Implementation Method 2
an attractive force in a form of an electromagnetic force is exerted between the armature and the pulley
Implementation Method 3
the flat spring that is shaped into a plate form and is formed to be rotatable integrally with the rotatable shaft... switching between coupling and decoupling... is made through elastic deformation of the flat spring
Data Source
AI summary
An electromagnetic clutch includes: a driving-side rotatable body that is rotated about an axis of a rotatable shaft of a drive-subject device; and a driven-side rotatable body that is placed on one side of the driving-side rotatable body in an axial direction. The electromagnetic clutch includes a flat spring that is formed to be rotatable integrally with the rotatable shaft of the drive-subject device and is joined to the driven-side rotatable body. The electromagnetic clutch includes a blocking member that is installed to the flat spring. A primary through-hole is formed in the driven-side rotatable body. A secondary through-hole is formed in the flat spring. Switching between coupling and decoupling between driving-side rotatable body and the driven-side rotatable body is made through elastic deformation of the flat spring. The blocking member closes the secondary through-hole.