Air-Conditioning Door Drive with Multi-Point Locking
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Solution Overview
Problem
Air-conditioning devices face challenges in distributing stress evenly across contact points between rotatable and stationary members, leading to potential deformation and damage due to concentrated stress, which can result in mechanical failures and reduced durability.
Innovation Solution
The implementation of a power transmission device with multiple lock mechanisms that distribute stress across multiple contacts at both ends of the rotatable member, preventing concentration of stress and ensuring even distribution, thereby reducing the risk of deformation and improving durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single lock mechanism is used to stop the rotatable member, then the structure is simple, but the stress concentrates on one contact part causing deformation and reduced durability
Solution Approach 1:
The single lock mechanism is divided into multiple lock mechanisms (first and second lock mechanisms) that are spaced apart around the rotatable member. Each lock mechanism has its own contact surface, so when the rotatable member stops, the stress is distributed across multiple contact points rather than concentrating on one, preventing deformation and improving durability.
2Reliability
If multiple lock mechanisms are used to distribute stress, then the reliability improves, but the device complexity increases
Solution Approach 1:
Multiple lock mechanisms are combined into a single integrated power transmission device structure. The first and second lock mechanisms share common components such as the stationary member housing and the rotatable member itself, allowing stress distribution across multiple contact points while avoiding the complexity of completely separate locking systems.
Data Source
AI summary
The present disclosure provides a power transmission device in which stress is reduced and a vehicle air-conditioning device. An air-conditioning device has an inside/outside air door. A power transmission device drives the inside/outside air door. The power transmission device has a motor, a gear train, and a cam mechanism. A first gear of the gear train provides a rotatable member. A plurality of lock mechanisms is provided, which stops a rotation of the first gear at one end and/or the other end in a rotation direction of the first gear. The plurality of lock mechanisms provide a plurality of contacts between the first gear and a stationary link cover.