Rotary Knob Radial Axial Guide Elements Play-Free Mounting
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing household appliance rotary knobs lack a play-free mounting solution with minimal installation space and effective haptic feedback, often requiring additional components and complex assembly processes.
Innovation Solution
A rotary knob design featuring radial and axial guide elements with sliding surfaces and latching hooks that allow for direct mounting on a control panel, providing radial and axial guidance with resilient deformation for easy installation and disassembly, and a receiving section for tolerancing actuating shafts, all made from cost-effective plastic injection molding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If traditional mounting methods are used for rotary knobs, then assembly is simpler, but mounting precision and haptic feedback are insufficient
Solution Approach 1:
The guidance structure is segmented into multiple radial guide elements and axial guide elements, each with specific functions. The radial guide elements provide radial guidance while axial guide elements provide axial positioning, allowing complex guidance requirements to be met through modular, distributed elements rather than a single complex structure
Solution Approach 2:
The guidance system operates in multiple dimensions simultaneously - radial guide elements constrain motion in the radial dimension while axial guide elements constrain motion in the axial dimension. This multi-dimensional guidance approach achieves precise mounting by addressing each dimensional constraint separately through dedicated guide elements
2Reliability
If additional components are used for mounting, then mounting stability is improved, but installation space increases
Solution Approach 1:
Multiple guidance functions are merged into the rotary knob itself through integrally formed guide elements. The radial guide elements and axial guide elements are built into the knob structure, eliminating the need for separate mounting components. This merging achieves mounting stability while minimizing installation space requirements
Solution Approach 2:
The rotary knob provides its own guidance and positioning functions through integrated guide elements, making the system self-sufficient. The guide elements work together to automatically ensure proper radial and axial positioning during installation without requiring external guidance components or complex assembly procedures
3Ease of operation
If guide elements are added for precise guidance, then haptic feedback is improved, but device complexity increases
Solution Approach 1:
Different regions of the rotary knob are given different local qualities - radial guide elements have sliding surfaces optimized for radial guidance while axial guide elements have latching hooks optimized for axial positioning. Each local region is specifically designed for its particular guidance function, providing excellent haptic feedback for each degree of freedom while keeping the overall design manageable through functional specialization
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 design achieves a compact, high-quality rotary knob with excellent haptic feedback and reduced installation space, allowing for precise guidance and easy assembly/disassembly without additional components, while accommodating tolerances in the actuating shafts.
Implementation Method 1
The axial guide elements are resiliently deformable. The locking hooks can be released again using a tool or without tools
Implementation Method 2
Each radial guide element has a sliding surface that is set up to slide on the outer wall of the opening
Data Source
Figure 1
Figure 2
Figure 3
AI summary
The invention relates to a household appliance (1) with a control panel (5) and a rotary knob (6) for actuating a control device of the household appliance (1), wherein the control panel (5) has an opening (21) into which a guide section (8) of the rotary knob (6) can be inserted, wherein the guide section (8) comprises radial guide elements (14) for radially guiding the guide section (8) on a cylindrical outer wall (22) of the opening (21) and axial guide elements (15) for axially guiding the rotary knob (6) on the control panel (5).