Modular Roller Freewheel Cage for Adjustable Torque Transmission
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Solution Overview
Problem
Existing roller freewheels require new calculations and designs when the maximum transmittable torque changes, leading to significant costs and reduced flexibility, as they are often commissioned early in the design phase with potential subsequent changes.
Innovation Solution
A roller freewheel design featuring a ramp ring with a ramp contour that houses multiple roll body rows, allowing for adjustable torque transmission by varying the number of roll body rows through separate partial cages, which can be connected loosely during assembly, reducing the need for redesign and increasing manufacturing tolerance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If roller freewheels are commissioned early in the design phase with fixed design, then design stability is improved, but adaptability to torque changes deteriorates
Solution Approach 1:
The roll body cage is divided into multiple separate partial cages, each containing a roll body row. This segmentation allows the number of roll body rows to be flexibly adjusted by adding or removing partial cages, enabling adaptation to different torque requirements while maintaining a stable base design structure.
Solution Approach 2:
The design transitions from a fixed, static configuration to a dynamic, adjustable configuration. The number of roll body rows can be changed based on torque requirements, making the system adaptable while maintaining structural stability through standardized partial cage modules.
2Power
If the number of roll body rows is increased to transmit higher torque, then torque transmission capability is improved, but device complexity increases
Solution Approach 1:
By segmenting the roll body cage into identical or similar partial cages, the system can increase torque capacity by simply adding more modules rather than redesigning the entire structure. This maintains relative simplicity while scaling power capability.
Solution Approach 2:
Multiple partial cages are combined within a single ramp ring structure, allowing the system to achieve higher torque transmission through aggregation of simpler components rather than through complex individual components.
3Reliability
If a single common ramp ring is used for multiple roll body rows, then synchronization of freewheeling function is improved, but manufacturing precision requirements worsen
Solution Approach 1:
The single ramp ring serves multiple functions by accommodating multiple roll body rows simultaneously. This universal component ensures synchronized operation of all roll body rows while distributing manufacturing tolerances across multiple identical partial cages rather than requiring high precision for a single complex 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
This design provides a cost-effective and flexible solution by allowing torque adjustment without requiring new calculations or designs, reducing production costs and assembly complexity, while maintaining high assembly safety and flexibility in torque transmission.
Implementation Method 1
The ramp ring has a ramp contour by means of which a respective roll body is held in a form-fitting manner in the first direction of rotation, for example as a result of an abrupt reduction in diameter
Implementation Method 2
The roll bodies are also pretensioned radially against the ramp ring by the roll body cage
Implementation Method 3
In the second direction of rotation, on the other hand, the respective roll body can be rotated relative to the ramp ring, for example as a result of a gentle reduction in diameter, which can thus be overcome against the pretensioning by means of the roll body cage
Data Source
AI summary
A roller freewheel includes a roll body cage, a plurality of roll bodies accommodated in the roll body cage, and a ramp ring having a ramp contour. The ramp contour blocks the roll bodies in a first direction of rotation and allows rotation of the roll bodies relative to the ramp ring in a second direction of rotation, opposite the first direction of rotation. The ramp contour is designed to accommodate a plurality of roll body rows. The roll body cage includes a plurality of separate partial cages, with each partial cage including at least one roll body row.