Electric Vehicle Swing Arm Harness Routing via Case Cover
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Solution Overview
Problem
Conventional swing arm drive devices for electric vehicles have a weakened pivot portion due to a through-hole, requiring increased thickness and weight to enhance strength, which complicates processing and increases weight.
Innovation Solution
A drive device with a pivot portion supported by a pivot shaft, featuring a box-shaped case with a case cover and elastic members to securely support the harness, allowing it to be pulled out through a harness supporting portion, reducing the need for reinforcement and processing complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a through-hole is formed at the joint portion of the first member and the third member to pull out the harness, then the harness can be extended from the motor to the power supply, but the strength of the pivot portion is weakened and the weight of the swing arm increases due to required reinforcement
Solution Approach 1:
The harness pulling function is extracted from the pivot portion joint and relocated to a dedicated harness support portion on the case cover. This separates the structural pivot function from the harness routing function, allowing the pivot portion to maintain full strength without through-holes while the harness is routed through a dedicated opening in the case cover.
Solution Approach 2:
The case cover acts as an intermediary component that provides a dedicated harness support portion with an opening for harness routing. This mediator component handles the harness extension function without compromising the structural integrity of the pivot portion, as the harness passes through the case cover rather than the pivot joint itself.
2Strength
If the thickness of the first member and the second member is increased to enhance the strength of the pivot portion, then the pivot portion can support the swing arm with the through-hole, but the weight of the swing arm increases
Solution Approach 1:
The harness routing function is extracted from the pivot portion, eliminating the need for reinforcement measures such as increased thickness. The pivot portion maintains its original thin-walled structure without additional material, thereby preventing weight increase while still providing the required strength for supporting the swing arm.
3Ease of manufacture
If the swing arm structure is simplified to reduce processing steps and weight, then the manufacturing complexity decreases, but the harness routing and support become more difficult
Solution Approach 1:
The case cover serves as an intermediary component that provides a dedicated harness support portion with an opening for easy harness routing. This allows the main swing arm structure to remain simple and easy to manufacture, while the case cover handles the harness routing function through its integrated opening and support features.
Solution Approach 2:
The swing arm is segmented into the main swing arm body and a separate case cover component. This segmentation allows the main body to be manufactured with simple processing steps, while the case cover is designed specifically to provide harness routing functionality through its opening and support portion, separating the manufacturing complexities.
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
This design simplifies the swing arm shape, reduces weight, and enhances harness durability by securely fixing and guiding it, protecting it from stress and environmental factors while maintaining structural integrity.
Implementation Method 1
the harness is supported by the case cover through an elastic member at the harness supporting portion
Data Source
AI summary
A swing arm (25) including a pivot portion (57) pivotally supported by a vehicle body frame (2) and an arm portion (100) extending from the pivot portion (57) towards a back side of a vehicle body. The arm portion (100) includes a box-shaped case (58) being integrally formed with the pivot portion (57) and having one side in a width direction of the vehicle body opened, and a case cover (59). A harness (64) pulled out from the motor (60) is fixedly supported on the case (58) side at a first position proximate to the motor (60), and extended to a control device (52) at a front side of the vehicle body from the arm portion (100) through a grommet (66, 67) arranged at a front wall (597) of the case cover (59) at a second position on the pivot portion (57) side.