Steering Wheel Vibration Device Mounting Mass Compensation
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Solution Overview
Problem
Existing steering wheels with vibration devices attached to the core member of the ring portion experience a partial increase in mass, leading to a decrease in natural frequency and unnecessary vibration during vehicle travel, due to the recessed housing design which increases the mass at the connection area.
Innovation Solution
A steering wheel design featuring a thickness-reduced portion on the core member to house and attach the vibration device, with an attaching bracket and reinforcement member to maintain strength and adjust mass, preventing a substantial increase in mass at the connection area and thus maintaining the natural frequency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a recessed portion for housing the vibration device is provided in the core member, then the vibration device can be housed and attached to the core member, but the mass at the connection area increases greatly causing the natural frequency to decrease
Solution Approach 1:
The core member is designed with a thickness-reduced portion at the connection area where the vibration device is mounted. This local modification reduces the mass specifically at the connection area while maintaining the overall structural integrity of the core member, thereby counteracting the mass increase from the attached vibration device and preventing natural frequency decrease
2Reliability
If the mass at the connection area increases, then the vibration device can be securely attached, but the natural frequency of the steering wheel is lowered causing unnecessary vibration during traveling
Solution Approach 1:
A thickness-reduced portion is provided at the connection area to locally reduce mass and counteract the mass increase from the vibration device, maintaining natural frequency and preventing unnecessary vibration during vehicle traveling
Solution Approach 2:
The thickness-reduced portion acts as a counterweight by removing material to compensate for the mass added by the vibration device. This mass compensation maintains the original natural frequency of the steering wheel and prevents the generation of unnecessary vibrations during vehicle operation
Data Source
AI summary
A steering wheel, in which a vibration device including a vibration motor is attached, the steering wheel includes: a ring portion including a core member and a thickness-reduced portion, reducing mass, provided with the core member. The vibration device is housed in the thickness-reduced portion and attached to the core member.