Four-Raceway Friction Transmission for Stable Planetary Support
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Solution Overview
Problem
Existing friction transmission devices are costly to manufacture due to the complex combination of numerous members required to support planetary assemblies, limiting their widespread application in robots and self-propelled bogies.
Innovation Solution
A friction transmission device design that reduces manufacturing costs by using a configuration with a planetary rolling element supported by four raceway rings, forming a stable quadrangle with extension lines of normal vectors at contact points, eliminating the need for additional shaft members and simplifying the support structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a complex combination of numerous members is used to support planetary assemblies, then the structural stability and rotational transmission efficiency are improved, but the manufacturing cost increases
Solution Approach 1:
The patent combines multiple support functions into a single integrated support structure that holds the planetary rolling element. Instead of using separate shaft members and multiple support components, the invention merges these functions into one unified structure that provides both radial and axial support, thereby reducing the number of parts and manufacturing cost while maintaining structural stability
Solution Approach 2:
The support structure is designed to perform multiple functions simultaneously: it supports the planetary rolling element radially, provides axial positioning, and enables rotational movement. This multi-functional design eliminates the need for separate components for each function, reducing manufacturing complexity and cost while ensuring reliable structural support
2Power
If numerous members are combined to support planetary assemblies, then the rotational transmission efficiency is improved, but the device complexity increases
Solution Approach 1:
The patent merges multiple support and transmission functions into a single integrated structure. The support structure simultaneously provides radial support, axial positioning, and rotational transmission capability, eliminating the need for multiple separate members and reducing device complexity while maintaining efficient power transmission
3Stability of the object's composition
If additional shaft members are used to support planetary rolling elements, then the stability of the rolling element posture is improved, but the manufacturing cost and device complexity increase
Solution Approach 1:
The patent combines the functions of multiple shaft members into a single integrated support structure that provides both radial and axial support for the planetary rolling element. This merged structure maintains the rolling element's posture stability while eliminating the need for separate shaft members, thereby reducing device complexity
Solution Approach 2:
The support structure is designed with multi-functionality to simultaneously provide radial support, axial positioning, and rotational movement capability. This universal design ensures the planetary rolling element maintains stable posture during operation without requiring additional specialized shaft members
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 device achieves cost reduction and stability of the planetary rolling element's posture, enabling broader applications while maintaining efficient rotational transmission.
Implementation Method 1
a planetary rolling element (20) that is disposed around a rotation axis of an input raceway ring (14) and comes into contact with the input raceway ring (14)... an output raceway ring (30) that comes into contact with the planetary rolling element (20)
Implementation Method 2
Friction transmission device... a first support raceway ring (26) and a second support raceway ring (28) that come into contact with the planetary rolling element (20)
Data Source
AI summary
Provided is a friction transmission device including an input raceway ring, a planetary rolling element that is disposed around a rotation axis of the input raceway ring and comes into contact with the input raceway ring; an output raceway ring that comes into contact with the planetary rolling element and is connected to an output shaft, and a first support raceway ring and a second support raceway ring that come into contact with the planetary rolling element. A quadrangle is formed by extension lines of normal vectors at contact points between the planetary rolling element and the respective raceway rings.