Construction Machine Door Harness Routing to Prevent Bending
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Solution Overview
Problem
The lifespan of harnesses in construction machine doors is reduced due to repeated bending during door rotations, leading to potential disconnection.
Innovation Solution
A smart door apparatus with upper and lower clamps and covers that guide the harness in the axial direction of the hinge mechanism, allowing only torsion to be applied, preventing bending and disconnection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the harness is installed at the door to supply electricity to the actuator, then the smart door apparatus can be operated, but the harness is repeatedly bent by door rotations which reduces its lifespan
Solution Approach 1:
A guide structure comprising guide holes and guide grooves is introduced as an intermediary element between the door and the harness. The guide grooves constrain the harness to move only in the axial direction (opening/closing direction), preventing it from moving in the rotation direction. This intermediary structure protects the harness from bending damage while allowing the door to rotate freely for normal operation.
Solution Approach 2:
The guide structure is divided into multiple segments: upper and lower guide holes, upper and lower guide grooves, and positioning grooves. Each segment performs a specific function in constraining and protecting the harness at different locations along its path through the door, collectively preventing bending while maintaining operational flexibility.
2Reliability
If the harness is allowed to move freely with door rotation, then installation is simple, but the harness bends and disconnects reducing lifespan
Solution Approach 1:
The guide holes and guide grooves are pre-formed in the door structure before the harness is installed. The positioning grooves are also pre-formed to locate the harness at specific positions. This preliminary preparation ensures that when the harness is installed, it is automatically guided and constrained to the correct path, preventing bending before damage can occur, while keeping the installation process straightforward.
Data Source
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AI summary
A smart door apparatus includes an actuator and a harness (100). The actuator is installed at a door (D) rotatably connected with a cabin (C) of the construction machine via a hinge mechanism (UH, LH). The actuator may be configured to operate a locking apparatus of the door by signals of a smart key (99). The harness (100) is arranged in an axial direction (X) of the hinge mechanism (UH, LH) to supply electricity to the actuator. Thus, only torsion may be applied to the harness regardless of rotation angles of the door to increase a lifespan of the harness (100).