Servo Locking Snap Feature for HVAC Actuator Service
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Solution Overview
Problem
In automotive HVAC systems, the tight space constraints within vehicles make it difficult to access and service the servo motor assembly without removing the entire HVAC assembly, as traditional fasteners are hard to reach, necessitating the removal of the entire assembly for maintenance.
Innovation Solution
The implementation of a fastener-less mounting system using a pivot pin and rotatable ears with deflectable locking tabs on the HVAC case, allowing the servo assembly to be securely attached and detached without additional fasteners, enabling service without removing the HVAC assembly from the vehicle.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional fasteners are used to attach the servo assembly to the HVAC case, then the attachment is secure and reliable, but the fasteners are difficult to access and service without removing the entire HVAC assembly due to tight space constraints
Solution Approach 1:
The mounting system is segmented into modular components: the HVAC case with integrated locking tabs, the servo assembly with corresponding ears, and a pivot pin connector. This segmentation allows the servo assembly to be independently attached and detached without removing the entire HVAC assembly, resolving the contradiction between secure attachment and ease of service.
Solution Approach 2:
The mounting system transitions from a static fastened state to a dynamic easily-detachable state through the pivot pin mechanism. The servo assembly can be quickly rotated and locked into place during installation, and just as easily removed by reversing the rotation, providing both reliability and serviceability.
2Ease of repair
If additional fasteners are added to enable serviceability, then the servo can be accessed more easily, but the device complexity increases and additional space is required for tool access
Solution Approach 1:
The fastening and locking functions are merged into a single integrated mechanism. The locking tabs on the HVAC case combine the fastening, locking, and alignment functions into one component that works with the servo ears and pivot pin, eliminating the need for separate fasteners and reducing overall system complexity.
Solution Approach 2:
The locking tab structure serves multiple functions simultaneously: it provides mechanical fastening, positional alignment, and rotational locking. This multi-functionality eliminates the need for additional specialized fasteners or tools, maintaining serviceability without increasing complexity.
3Volume of moving object
If the servo assembly is tightly integrated into the HVAC case, then space utilization is maximized, but the servo becomes difficult or impossible to service without removing the entire assembly
Solution Approach 1:
The tight integration is achieved through segmentation that allows for easy separation. The servo assembly is segmented as a distinct module that can be independently attached and detached via the pivot pin mechanism, maximizing space utilization while maintaining full accessibility for service operations.
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
This solution allows for easy installation, service, and replacement of the servo assembly within the vehicle, reducing the need for additional space and tools, and providing a secure attachment mechanism that prevents rotational, lateral, or vertical movement, while also offering an optional fastener-based attachment for added security.
Implementation Method 1
Each fastener-less attachment means comprises a ramp and deflectable locking tab located on the HVAC case
Implementation Method 2
Each fastener-less attachment means comprises a ramp and deflectable locking tab located on the HVAC case, and oriented in the similar direction of rotation around the pivot pin receiving recess
Data Source
AI summary
Disclosed is a vehicle HVAC system that provides for installation, serviceability, or replacement of at least one actuator servo without removal of the HVAC assembly from the vehicle. As due to the tight space limitations, the present invention provides for at least one fastener-less mounting element of the servo assembly to be attached to the HVAC assembly, without the need for additional fasteners which would require additional space to access with a tool.