Elastic Cage Freewheel Assembly With Integrated Load-Bearing Rollers
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Solution Overview
Problem
Conventional sprag freewheels require an additional bearing due to lacking load capacity, and existing freewheel elements with cages and clamping elements have uneven elasticity, necessitating metallic springs for support.
Innovation Solution
A freewheel element with a cage having higher elasticity than clamping and rolling elements, incorporating rolling elements in equidistant pockets, and utilizing a polymer material like polyamide with fillers for enhanced elasticity, allowing snap-in connections for easy assembly and integration of load-bearing capacity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If conventional sprag freewheels are used, then the structure is simple, but additional bearings are required due to lacking load capacity
Solution Approach 1:
The patent combines the cage structure with load-bearing rolling elements into a single integrated component. The cage directly supports rolling elements that provide load capacity, eliminating the need for separate bearing components while maintaining structural simplicity.
Solution Approach 2:
The cage serves multiple functions: it holds the clamping elements, supports the rolling elements for load bearing, and provides structural framework. This multi-functionality allows the single component to replace what would traditionally require separate bearings.
2Reliability
If metallic springs are used for support, then the spring behavior is predictable, but the device complexity increases
Solution Approach 1:
The cage is designed with inherent elastic properties that provide the necessary spring behavior without requiring separate spring components. The material and geometric design of the cage itself generate the required elasticity and support characteristics.
Solution Approach 2:
The patent changes the material parameters of the cage (using elastomeric or polymeric materials with specific elasticity ranges) to achieve the desired spring behavior. By adjusting material properties and cage geometry, the elastic characteristics are optimized without adding separate spring elements.
3Ease of operation
If the cage has high elasticity for spring behavior, then the clamping elements can be secured, but the positional stability of rolling elements may be compromised
Solution Approach 1:
The cage is designed with different local properties: regions with higher elasticity for retaining clamping elements and regions with greater stiffness for positioning rolling elements. This spatial variation in material or structural properties allows both functions to be optimized simultaneously within the same component.
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 provides integrated load capacity without additional bearings, ensures secure mounting of rolling elements, and adjusts spring behavior for uniform support, enhancing the freewheel's load-bearing capability and operational stability.
Implementation Method 1
The cage has a higher elasticity than the clamping elements and the rolling elements. By utilizing the elastic properties of the cage material, the rolling element pocket can be elastically expanded to engage or snap the rolling element into the pocket.
Data Source
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Figure 5
AI summary
The invention relates to a freewheeling element (1) comprising a cage (10), a plurality of clamping bodies (20), each of the clamping bodies (20) being received in an associated clamping body pocket (11) formed in the cage (10), and a plurality of rolling bodies (30), each of the rolling bodies (30) being received in an associated rolling body pocket (12) formed in the cage (10), the cage (10) having a higher resilience than the clamping bodies (20) and the rolling bodies (30).