HVAC Shutter Gear Retention Without Screws or Washers
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Solution Overview
Problem
Existing heating, ventilation, and air conditioning systems in motor vehicles require additional parts like screws and washers to secure pinions to racks, complicating the manufacturing process and increasing costs.
Innovation Solution
A control device with an axial retainer and a rack carried by opposite sides of an inner circumference, eliminating the need for additional parts by using an oblong hole to secure the gear in place, simplifying the manufacturing process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If additional parts like screws and washers are used to secure pinions to racks, then the connection reliability is improved, but the device complexity and manufacturing cost increase
Solution Approach 1:
The patent merges the pinion mounting function directly into the rack structure by forming a mounting recess and axial retention feature as integral parts of the rack body. This eliminates the need for separate screws and washers, reducing the number of parts while maintaining secure connection through the integrated geometric features that mechanically lock the pinion in place
Solution Approach 2:
The rack structure provides its own mounting and retention functions through self-contained geometric features - the mounting recess receives and positions the pinion, while the axial retention feature prevents displacement. The system serves its own fastening needs without requiring external fastening components
2Strength
If additional parts like screws and washers are used to secure pinions to racks, then the connection strength is improved, but the manufacturing cost increases
Solution Approach 1:
The mounting recess and axial retention feature are formed as integral portions of the rack during rack manufacturing, eliminating the need for separate fastening components. This integration reduces part count and assembly steps while maintaining connection strength through properly designed geometric interlocking features
Solution Approach 2:
The patent extracts the fastening function from separate components (screws and washers) and incorporates it directly into the rack structure itself. The retention feature is designed to provide equivalent or superior connection strength without requiring additional fastening hardware
3Stability of the object's composition
If additional parts like screws and washers are used to secure pinions to racks, then the axial security is improved, but the manufacturing process complexity increases
Solution Approach 1:
The rack structure provides its own axial retention capability through an integrated retention feature that is formed as part of the rack body. This self-contained approach eliminates the need for separate axial securing components and simplifies the manufacturing process by reducing the number of parts that need to be sourced, assembled, and fastened
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
Reduces the number of parts required, simplifying the manufacturing process and lowering costs by securing the gear without screws and washers.
Implementation Method 1
transmission systems are generally designed, comprising a rack in the form of a toothed bar that meshes with a pinion. The rotation of the pinion, driven by the rack, controls the pivoting of an associated flap
Data Source
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AI summary
The invention relates to a device for controlling an element, such as a shutter, for a motor vehicle heating, ventilation and/or air conditioning system, comprising: - an arm (31) comprising an opening (3) so as to define a ring the inner circumference (4) of which at least partially comprises a rack (5) and an axial retaining means (14), - a toothed wheel (11) intended to be rigidly connected to an axis and shaped to cooperate with the axial retaining means (14) and the rack (5) so as to cause the element to move.