Stepped Motor Housing Mounting for In-Wheel Motor Stability
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Solution Overview
Problem
Conventional in-wheel motor systems face inefficiencies in space utilization and stability due to the placement of components like reducers and disc brakes within the wheel, leading to potential damage from external shocks and uncertain fastening effectiveness against vibrations and shocks.
Innovation Solution
A mounting structure utilizing a torsion beam axle assembly with a stepped motor housing and ring-shaped fastening face, along with a trailing arm and fastening bolts, to securely attach the in-wheel motor system to the vehicle, optimizing space usage and enhancing stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the reducer and disc brake are installed inside the wheel, then the in-wheel motor system can be compactly arranged, but the system becomes vulnerable to damage from external shocks and space utilization becomes inefficient
Solution Approach 1:
The patent extracts the in-wheel motor system from the wheel interior and relocates it to the vehicle body (torsion beam axle assembly). The motor housing is mounted externally on the vehicle body, separating the motor system from the wheel structure. This extraction resolves the contradiction by providing both adequate protection space and shock resistance while maintaining compact integration through the TBA mounting structure.
2Volume of moving object
If the in-wheel motor protrudes outside the wheel, then space inside the wheel can be utilized, but the motor becomes vulnerable to damage from external shocks
Solution Approach 1:
The motor system is extracted from the wheel assembly and mounted on the vehicle body's torsion beam axle. This relocation removes the motor from the vulnerable external environment while maintaining efficient space utilization through integrated mounting on the existing vehicle structure.
Solution Approach 2:
The motor housing incorporates a stepped structure with a ring-shaped fastening face that provides inherent shock absorption and vibration resistance. The stepped design creates cushioning zones that protect the motor from external shocks before they can reach critical components.
3Device complexity
If a bracket with two bolt fastening holes is used to mount the in-wheel motor, then the mounting structure is simple, but the fastening effectiveness against vibrations and shocks is uncertain
Solution Approach 1:
The patent merges the mounting bracket functionality into the torsion beam axle assembly itself. The TBA structure integrates the mounting function with the existing suspension structure, eliminating the need for separate simple brackets while providing superior fastening effectiveness through the robust TBA construction and multiple fastening points.
Solution Approach 2:
The motor housing features a stepped structure with a ring-shaped fastening face that provides enhanced contact area and distribution of vibrational and shock loads. This curved/stepped geometry improves fastening effectiveness by distributing stresses across multiple surfaces rather than concentrated bolt holes.
Data Source
AI summary
A mounting structure for an in-wheel motor system is provided. The mounting structure includes the in-wheel motor system installed in a wheel of the vehicle, and a torsion beam axle (TBA) assembly to fix the in-wheel motor system to a vehicle body, wherein a rear portion of a motor housing includes a step portion formed in a stepped manner to have a decreased diameter, and a ring-shaped fastening face vertically arranged from the step portion, and the TBA assembly includes a trailing arm provided with a through hole to surround the step portion of the motor housing, a mount integrated with the trailing arm to fix the trailing arm to a vehicle body, and a plurality of fastening bolts to fix the motor housing to the trailing arm, wherein, when the step portion is fitted and coupled into the through hole, the fastening face closely contacts the trailing arm.