Motor Support Structure for Steering Device Using Single Fastener
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Solution Overview
Problem
Conventional motor supporting structures for electric power steering devices, such as the cantilever and fix-ended structures, are inefficient due to increased parts and manufacturing time, and they often result in noise and deformation issues.
Innovation Solution
A motor supporting structure that reduces the number of parts by using a single fastener to connect the motor and its peripheral parts to the rack housing, eliminating the need for additional fasteners and threaded holes, while also incorporating an elastic material to absorb vibrations and improve noise reduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a fix-ended structure with bolts is used to connect the motor to the rack housing, then the motor support strength is improved, but the number of parts and manufacturing complexity increases
Solution Approach 1:
The patent combines the motor support function with the rack housing itself by providing a support protrusion that extends from the rack housing to support the motor. This integration eliminates the need for separate support brackets or additional fastening components, thereby maintaining motor support strength while reducing the number of parts.
Solution Approach 2:
The rack housing is designed to serve multiple functions: it not only houses the rack bar but also provides structural support for the motor through its integrated support protrusion. This multi-functionality reduces the need for additional dedicated support components, simplifying the overall structure.
2Strength
If a fix-ended structure with bolts is used to connect the motor to the rack housing, then the motor support strength is improved, but the manufacturing time increases
Solution Approach 1:
By integrating the motor support function into the rack housing structure itself, the patent eliminates the need for separate fastening operations. The support protrusion is formed as part of the rack housing manufacturing process, reducing assembly time and eliminating the need for additional bolt installation steps.
3Device complexity
If a cantilever structure supporting only one end of the motor is used, then the number of parts is reduced, but the motor support strength becomes weak causing deformation and noise
Solution Approach 1:
The patent segments the support function by providing multiple support protrusions at different locations on the rack housing. These distributed support points work together to provide adequate motor support strength while maintaining a simple overall structure with fewer parts compared to traditional fix-ended structures.
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 configuration reduces manufacturing time and parts, enhances sealing, improves vibration absorption, and maintains accurate detection of magnetic fields, leading to a more efficient and reliable motor support system.
Implementation Method 1
a second elastic material 50B that is interposed between the tip portion 41 of the stay 40 and the cover member 16
Data Source
AI summary
A motor supporting structure for a steering device includes a motor one end of which has an output shaft extending along the axial direction of the rack bar, a motor peripheral part that is disposed on the other end of the motor, and a first fastener that includes a first bolt and that fastens the motor and the motor peripheral part in the axial direction. The rack housing includes a first support that supports one end of the power generator unit and a second support that supports the other end of the power generator unit. The second support has a tip portion connected to the other end of the power generator unit. The tip portion of the second support has a first hole through which the shaft of the first bolt passes, and is fastened by a first fastener, together with the motor and the motor peripheral part.