Vehicle Air Conditioner Sliding Door Drive Without Gear-Rack Binding
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing sliding door assemblies in HVAC units face manufacturing challenges due to the need for high precision in geared shafts and toothed racks, leading to misalignment, binding, and noise issues.
Innovation Solution
A simplified sliding door assembly with a centrally located rotary drive mechanism, featuring a door structure with a channel for a rollably received drive body and an engagement feature that transfers rotational motion to linear translation, facilitating easier manufacturing through extrusion or pultrusion processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If geared shafts and toothed racks are used for sliding door actuation, then the door can be controlled to slide between flow paths, but manufacturing precision requirements become excessively high leading to misalignment and binding
Solution Approach 1:
The patent replaces the traditional gear-rack mechanical system with a rotary drive structure that converts rotational motion to linear motion through a different mechanism. The rotary drive structure includes a rotary drive member with an eccentric axis that rotates within a guide structure, creating linear motion without requiring precision-matched gear teeth. This substitution eliminates the need for high-precision gear and rack formation while maintaining reliable door sliding control.
2Manufacturing precision
If high precision gear and rack interfaces are manufactured, then proper door alignment is achieved, but manufacturing complexity and cost increase significantly
Solution Approach 1:
The patent substitutes the complex precision gear-rack interface with a simpler rotary drive mechanism consisting of a rotary drive member with an eccentric axis rotating within a guide structure. This mechanism achieves the same door positioning function without requiring precision-matched toothed interfaces, thereby reducing manufacturing process complexity while maintaining proper door alignment.
Solution Approach 2:
The patent changes the fundamental operating parameters from rotational gear engagement to eccentric rotational motion that generates linear displacement. By using an eccentric axis offset from the center of the rotary drive member, the system converts rotation into linear motion that directly actuates the door, eliminating the need for precision gear tooth engagement and simplifying manufacturing parameters.
3Ease of operation
If precise gear and rack engagement is maintained, then smooth door operation is achieved, but any manufacturing tolerance results in binding and seizure
Solution Approach 1:
The patent replaces the precision-dependent gear-rack system with a rotary drive system where an eccentrically positioned axis rotates within a guide structure. This substitution creates a more tolerant mechanism where manufacturing variations do not cause binding, as the eccentric rotation naturally accommodates tolerance variations while maintaining smooth door sliding operation.
4Ease of manufacture
If traditional gear shafts and toothed racks are used, then door actuation is achieved, but manufacturing simplicity is compromised
Solution Approach 1:
The patent substitutes the traditional two-component gear-rack system with a single integrated rotary drive structure. This rotary drive member incorporates the eccentric axis and guide structure as one assembly, reducing the number of parts and simplifying manufacturing while achieving the same door actuation function. The eccentric rotation mechanism provides a more manufacturable solution compared to precision gear and rack pairs.
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 addresses manufacturing precision issues, prevents misalignment and binding, reduces noise, and simplifies the manufacturing process, resulting in a more reliable and cost-effective sliding door assembly.
Implementation Method 1
An engagement feature is configured to transfer the selective rotation of the first rotary drive structure about the axis of rotation thereof to linear translation of the door structure along the axial direction thereof and relative to the axis of rotation of the first rotary drive structure
Data Source
AI summary
A sliding door assembly includes a door structure having a channel formed therein with the channel extending in an axial direction of the door structure. A first rotary drive structure is configured for selective rotation about an axis of rotation thereof. The first rotary drive structure includes a first drive body rollably received within the channel of the door structure. An engagement feature is configured to transfer the selective rotation of the first rotary drive structure about the axis of rotation thereof to linear translation of the door structure along the axial direction thereof and relative to the axis of rotation of the first rotary drive structure. The door structure may be formed by an extrusion or pultrusion manufacturing process.