Harness Connector Lock Restriction in Electric Work Vehicles
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Solution Overview
Problem
The lock member of an electric work vehicle's harness connector can be inadvertently operated to the release position due to contact with branches or vibrations during travel, leading to disconnection of the harness.
Innovation Solution
A restriction member is placed on the operation path of the lock member to prevent it from moving from the retaining to the release position, which is removable by a fixing member for maintenance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the lock member is provided for the connector of the harness to allow easy connection and disconnection, then the ease of operation is improved, but the reliability deteriorates because the lock member can be inadvertently operated to the release position due to contact with branches or vibrations during travel
Solution Approach 1:
The restriction member is installed on the operation path of the lock member before any accidental operation can occur. This preliminary protective measure blocks the lock member from moving to the release position, preventing harmful effects before they can happen while maintaining the normal locking and unlocking functions.
Solution Approach 2:
The restriction member acts as an intermediary element between the lock member and the release position. It physically intervenes in the operation path of the lock member, allowing intentional operation by the operator while blocking unintentional operation caused by external factors like branches or vibrations.
2Reliability
If the restriction member is permanently fixed to prevent lock member operation, then the reliability is improved, but the ease of repair deteriorates because the connector cannot be easily disconnected for maintenance
Solution Approach 1:
The restriction member is designed with dynamic characteristics - it can be in a blocking state during normal operation to prevent accidental disconnection, and can be easily removed when maintenance is needed. This dynamic adaptability allows the system to switch between protection mode and maintenance mode, resolving the contradiction between reliability and ease of repair.
Solution Approach 2:
The restriction member is designed to be temporarily discarded (removed) during maintenance operations and then recovered (reinstalled) after maintenance is complete. This temporary removal allows easy disconnection of the connector for maintenance, while reinstatement restores the protective function, balancing reliability and ease of repair.
Data Source
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AI summary
An electric work vehicle includes a harness 52 configured to supply power from a battery to a motor 15 and a connector 54 provided at an end portion of the harness 52 and connected to the motor 15. The electric work vehicle includes a lock member 59 artificially operable between a retaining position A1 at which the lock member retains connection between the connector 54 and the motor 15 and a release position A2 at which the lock member allows the connector 54 to be separated from the motor 15. The electric work vehicle includes a restriction member 60 provided on an operation path of the lock member 59 between the retaining position A1 and the release position A2 to hinder the lock member 59 from being operated from the retaining position A1 to the release position A2, and the restriction member 60 is removable. (Fig. 13)