Vehicle Sliding Door Driving Unit Vibration Damping
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Solution Overview
Problem
Conventional driving units for sliding doors in vehicles, equipped with a speed reduction mechanism using spur gears and low-speed motors, generate low-frequency vibrations that cause noise due to resonance with the vehicle body, leading to an unpleasant experience for occupants.
Innovation Solution
A driving unit incorporating a planetary gear speed reducer with a ring gear fixed to a casing via a buffering member, which reduces the size of the unit and suppresses low-frequency vibrations by absorbing them before they reach the vehicle body, preventing resonance and noise transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If a speed reduction mechanism using spur gears and low-speed motor is adopted, then the driving unit size is reduced, but low-frequency vibrations are generated causing noise
Solution Approach 1:
A buffering member is introduced as an intermediary component between the planetary gear speed reducer and the vehicle body. This buffering member absorbs low-frequency vibrations generated by the speed reducer before they are transmitted to the vehicle body, preventing resonance and noise generation while maintaining the compact driving unit design
2Volume of moving object
If a planetary gear speed reducer is used, then the driving unit is compact, but low-frequency vibrations are transmitted to the vehicle body causing resonance
Solution Approach 1:
The buffering member serves as a mediator that intercepts vibration transmission paths from the planetary gear speed reducer to the vehicle body. It selectively absorbs low-frequency vibrations that cause resonance while allowing the compact planetary gear design to be maintained
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
The solution effectively reduces noise and vibration transmission to the vehicle interior, enhancing the occupant experience by mitigating low-frequency vibrations and maintaining a compact unit size.
Implementation Method 1
a buffering member disposed between the casing and the fixed member... the buffering member... suppresses low-frequency vibrations which are transmitted from the planetary gear speed reducer to the vehicle
Data Source
AI summary
A ring gear (82) of a planetary gear speed reducer (80) is fixed to a casing (31) provided with a core metal (31) fixed to a vehicle panel via a rubber damper (92). Therefore, the driving unit can be reduced in size through adoption of a speed reducer (80) formed of gears (82) made of spur gears, and the rubber dumper (92) can suppress low frequency vibrations which are transmitted from the speed reducer (80) to the vehicle panel. Therefore, the vehicle body of the vehicle having a low characteristic frequency is prevented from resonating with the incoming low frequency vibrations to generate noises which are transmitted to the vehicle interior, and which give an occupant an unpleasant feeling.