Power Source Circuit Shutoff Apparatus Lever Operability
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Solution Overview
Problem
The existing power source circuit shutoff apparatus for electric vehicles and hybrid electric vehicles faces challenges in operability due to the configuration of signal terminals, which increases the effort required to rotate the lever, potentially leading to reduced operability and increased risk of arc discharge during switching.
Innovation Solution
The power source circuit shutoff apparatus is redesigned with signal terminals disposed along a straight line perpendicular to the rotational spindle direction of the lever, allowing for dispersed force distribution during rotation and rapid switching, eliminating the need for bending and reducing production costs by aligning both signal and main terminals along the same line, thereby improving lever operability and suppressing arc discharge.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If signal terminals are disposed along the rotational spindle direction of the lever, then the lever can be easily manufactured and assembled, but the operability of the lever deteriorates due to increased rotational force requirements
Solution Approach 1:
The signal terminals are repositioned from the rotational spindle direction to a direction perpendicular to the rotational spindle direction. This dimensional change in terminal arrangement allows the lever to rotate more easily while still establishing reliable electrical contacts, as the terminals engage in a sequence that reduces rotational resistance.
Solution Approach 2:
The signal terminal contacts are segmented into a sequential engagement pattern rather than simultaneous contact. This segmentation allows the lever to rotate through discrete stages of contact establishment, reducing the peak rotational force required and improving overall operability.
2Device complexity
If signal terminals are disposed along the rotational spindle direction, then the structure is simplified, but the switching speed deteriorates due to prolonged contact time
Solution Approach 1:
By arranging signal terminals perpendicular to the rotational spindle direction, the patent creates a faster switching mechanism. The terminals engage and disengage in rapid succession during lever rotation, reducing the time the circuit remains in an intermediate state and improving switching speed.
3Reliability
If second signal terminals are bent to achieve proper contact alignment, then contact reliability is improved, but production costs increase
Solution Approach 1:
The patent eliminates the need for bending second signal terminals by changing their spatial arrangement to perpendicular alignment with the rotational spindle. This allows terminals to be manufactured in a straight configuration and installed without additional forming operations, reducing production complexity and cost while maintaining reliable contact.
Data Source
AI summary
In a power source circuit shutoff apparatus, with the lever rotated from a connector mating start position to a connector mating completion position, a pair of first signal terminals and a pair of second signal terminals are brought into on-state after a pair of first main terminals and a pair of second main terminals are brought into on-state. With the lever rotated from the connector mating completion position to the connector mating start position, a pair of first main terminals and a pair of second main terminal are brought into off-state after a pair of first signal terminals and a pair of second signal terminals are brought into off-state. The pair of first signal terminals and the pair of second signal terminals are each disposed along a straight line extending in a direction perpendicular to a rotational spindle direction of the lever.