Rotary apparatus
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Solution Overview
Problem
In quiet vehicle environments, existing rotary apparatuses for vehicle air conditioning systems generate excessive noise due to vibrations at the positions of the output gear, which are not adequately suppressed by current designs.
Innovation Solution
The rotary apparatus incorporates vibration damping parts, including projecting portions and attachment members with increased weight, strategically positioned around the output gear within the housing to dampen vibrations and reduce noise. These parts are formed from different materials, such as resin and metal, and are designed to increase the weight and thickness of specific surface portions, thereby reducing resonance and noise emission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the housing is made with a resin material, then the manufacturing cost is reduced and ease of manufacture is improved, but the vibration damping performance is insufficient leading to increased noise
Solution Approach 1:
The patent combines resin material for the housing with metal vibration damping parts to create a composite structure. The resin housing maintains ease of manufacture and cost-effectiveness, while the metal vibration damping parts provide superior vibration damping performance to reduce noise generated by the output gear.
2Object-generated harmful factors
If vibration damping parts are added to the housing, then noise is reduced, but the device complexity increases
Solution Approach 1:
Instead of making the entire housing complex, the patent applies vibration damping parts only at specific locations where noise is generated (around the output gear). This localized approach reduces noise effectively while minimizing the increase in overall device complexity.
3Object-generated harmful factors
If the surface portion thickness is increased to add weight, then vibration damping is improved and noise is reduced, but the manufacturing cost and device complexity increase
Solution Approach 1:
The patent increases the thickness of the surface portion only at specific locations where vibration damping is needed (facing the output gear), rather than uniformly throughout the housing. This localized thickening provides effective noise reduction while minimizing the impact on manufacturing complexity and cost.
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 implementation of vibration damping parts effectively reduces noise levels by damping vibrations and suppressing resonance, achieving a sound pressure drop of 1 dB or more in the frequency with the highest sound volume, enhancing the quietness of the vehicle interior.
Implementation Method 1
one of the first surface portion and the second surface portion includes a vibration damping part opposing the output gear
Implementation Method 2
the vibration damping part is a projecting portion projecting into the housing from the surface portion and increasing weight of the surface portion
Data Source
AI summary
A rotary apparatus includes a motor, a plurality of gears including an output gear, and a housing accommodating the plurality of gears and the motor. The housing includes a first surface portion, a second surface portion facing the first surface portion and spaced apart from the first surface portion, and a sidewall portion provided at an outer peripheral portion of the first surface portion and the second surface portion and supporting the first surface portion and the second surface portion. One of the first surface portion and the second surface portion includes a vibration damping part opposing the output gear.