Frictional Roller Reducer With Elastic Surface Pressure Control
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Solution Overview
Problem
The frictional roller reducer experiences inefficiencies in torque transmission due to insufficient surface pressure at traction portions, leading to potential gross slipping and reduced durability, and existing solutions either increase rolling resistance or require complex actuation systems to adjust pressing forces.
Innovation Solution
Incorporating a sun roller, ring roller, intermediate rollers, and an elastic member that elastically urges the roller elements away from the rolling surfaces, reducing the need for external actuation and maintaining optimal surface pressure through the elastic member's deflection, thereby preventing excessive pressing force and skew-induced inefficiencies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a loading cam device is used to press roller elements to increase surface pressure, then torque transmission efficiency is improved, but device complexity and rolling resistance increase
Solution Approach 1:
The elastic member automatically adjusts the pressing force between roller elements based on its own elastic deformation, eliminating the need for external loading cam devices or actuators. The system serves itself by using the elastic member's inherent properties to maintain optimal surface pressure throughout the operating cycle.
Solution Approach 2:
The patent removes the complex loading cam device and external actuation systems from the frictional roller reducer, retaining only the essential elastic member that provides the necessary pressing force through its elastic properties, thereby simplifying the overall device structure.
2Stress or pressure
If external actuation systems are used to adjust pressing forces, then surface pressure control is improved, but energy loss and system complexity increase
Solution Approach 1:
The elastic member autonomously regulates surface pressure through its elastic deformation characteristics, eliminating the need for external energy sources or control systems. The pressing force is self-adjusting based on the elastic member's mechanical properties rather than requiring active energy input.
Solution Approach 2:
The elastic member undergoes periodic elastic deformation during the operating cycle, naturally creating periodic pressing force variations that maintain optimal surface pressure without requiring continuous external energy input or active control.
3Reliability
If pressing force is increased to prevent gross slipping, then torque transmission reliability is improved, but rolling resistance and energy loss increase
Solution Approach 1:
The elastic member's pressing force is dynamically adjusted through changes in its elastic deformation parameters, maintaining the minimum necessary force to prevent gross slipping without applying excessive pressing force that would increase rolling resistance and energy loss.
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 configuration ensures stable and efficient torque transmission by maintaining appropriate surface pressure and reducing the risk of gross slipping, while avoiding the complexity and energy loss associated with external actuation systems.
Implementation Method 1
an elastic member that elastically urges the roller elements away from the rolling surfaces
Implementation Method 2
a frictional roller reducer that is incorporated, for example, in a drive system of an electric vehicle for transmitting torque
Data Source
AI summary
A frictional roller reducer having a sun roller; a ring roller; a plurality of intermediate rollers having rolling surfaces coming in rolling contact with the sun roller and the ring roller; the sun roller or the ring roller having a pair of roller elements including inclined surface portions on a circumferential surface coming in rolling with rolling surfaces, the inclined surface portions inclined in directions going toward the intermediate rollers in a radial direction as going away from each other in the axial direction; a pressing device pressing the pair of roller elements in directions going closer to each other, and an elastic member arranged between the pair of roller elements, the elastic member urging the pair of roller elements in directions going away from the rolling surface of the intermediate rollers.