Vehicle Motor Drive Casing Layout for Secure Signal Cable Routing
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Solution Overview
Problem
Existing motor drive devices for vehicles face challenges in ensuring the reliable wired state of signal cables, particularly due to the lack of effective positioning and fixing methods, which can lead to malfunctions during assembly and operation.
Innovation Solution
A motor drive device design that includes a casing with a partitioned structure, through holes for signal cables, and an anchoring unit to securely fix the cables, allowing for direct visual confirmation of the wired state and improved reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the power line is not positioned and fixed at the point of closing the housing, then the assembly process is simpler and faster, but the wired state of the power line cannot be directly confirmed and the cable may be pinched or damaged
Solution Approach 1:
The signal cable is preliminarily positioned and fixed to the first case portion before the second case portion is attached. This preliminary action allows the wired state to be confirmed before final assembly, resolving the contradiction by enabling reliability checking without sacrificing assembly efficiency.
2Reliability
If the signal cable is arranged in a radial direction along the inner end surface of the rear cover, then the cable is protected from pinching, but the wiring structure cannot be applied to sensors fixed to the motor casing or reducer unit casing
Solution Approach 1:
The patent provides a universal wiring structure where the signal cable can be fixed to the first case portion and extended to various locations depending on sensor placement. This universal approach allows the same basic structure to accommodate sensors fixed to the motor casing, reducer unit casing, or other positions, resolving the contradiction between cable protection and adaptability.
3Device complexity
If the signal cable is not anchored within the casing, then the device structure is simpler, but the cable may move or become pinched during assembly and operation
Solution Approach 1:
The first case portion is designed with an integrated anchoring structure that automatically secures the signal cable in place. This self-service approach provides cable fixation as an inherent function of the case portion, resolving the contradiction by maintaining structural simplicity while ensuring cable position stability through the built-in anchoring capability.
Data Source
AI summary
A casing (10) is divided into a cylindrical first case portion (51) integrally having a partition part (54), a second case portion (52) connected to one end of the first case portion in an axial direction and configured to cover a second space (S2), and a third case portion (53) connected to the other end of the first case portion in the axial direction and configured to cover a first space (S1). A signal cable passed through a through hole (54c) of the partition part extends from a sensor (72, 73) to an external connector (81) provided in the second case portion or the third case portion, and is anchored to the first case portion (51) in the vicinity of a through hole (54c) of the partition part.