Magnetic Relay Fixing Frame for Stress-Free Shaft Positioning
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The complex structure of the base in magnetic latching relays leads to uneven injection molding, causing misalignment of the fixing frame, which results in stress between the rotating shaft and shaft hole, affecting the armature's swing and the electrical performance of the relay.
Innovation Solution
A fixing frame with longitudinal and transverse limit parts that ensure accurate positioning by clamping the yoke and fitting with the base without clearance, allowing smooth rotation of the rotating shaft and stable armature-yoke overlap.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the fixed post is inserted into the hole on the base to fix the permanent magnet, then the permanent magnet is secured to the base, but the injection molding unevenness causes misalignment and stress between the shaft hole and rotating shaft
Solution Approach 1:
The fixing frame is divided into multiple functional components: a body portion, a fixed post for base insertion, and a limit part with positioning protrusions. This segmentation allows each component to perform its specific function independently, with the limit part compensating for base manufacturing variations while the fixed post provides secure anchoring.
Solution Approach 2:
The limit part acts as an intermediary element between the fixing frame and the base. Its positioning protrusions engage with corresponding positioning structures on the base, serving as a mediator that absorbs manufacturing tolerances and ensures accurate positioning of the permanent magnet assembly regardless of injection molding unevenness.
2Manufacturing precision
If the shaft hole is made to fit the rotating shaft tightly to prevent dislocation, then positioning is improved, but rotation flexibility is reduced due to stress
Solution Approach 1:
The shaft hole is designed with a dynamic fit that balances positioning and rotation. The hole dimensions and shape are optimized to provide sufficient guidance for accurate positioning while maintaining clearance or interference characteristics that allow smooth rotation of the permanent magnet assembly without excessive stress.
Solution Approach 2:
Different regions of the shaft hole have different functional characteristics. The upper portion provides positioning constraint with tighter tolerance, while the lower portion allows rotation with appropriate clearance. This local differentiation of quality ensures both accurate positioning and rotation flexibility are achieved in different zones of the same component.
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 ensures flexible adjustment and accurate installation, preventing stress and improving the electrical performance of the magnetic latching relay by ensuring smooth rotation and stable armature-yoke overlap.
Implementation Method 1
The magnetic latching relay includes a base, a permanent magnet, an armature on both sides of the permanent magnet
Implementation Method 2
the rotating shaft of the permanent magnet rotates, driving the armature to swing
Data Source
Figure 1~2
Figure 3~4
Figure 5~6
AI summary
A fixing frame (100) for fixing at least a permanent magnet (300) of a magnetic latching relay includes a body (1) having shaft hole (13) for installing a rotating shaft (301) of a permanent magnet (300); at least one longitudinal limit part (2) arranged on the body (1) including two vertical limit column (21)s arranged oppositely along a longitudinal direction (Y), two vertical limit column (21)s clamp a yoke (400) of the magnetic latching relay and fit with the yoke (400) without clearance in the longitudinal direction (Y); and at least one transverse limit structure arranged on the body (1) and fitted with a transverse fit structure of the magnetic latching relay without clearance in a transverse direction (X); wherein the transverse direction (X) is perpendicular to the longitudinal direction (Y).