Automatic Speed Reduction Switching Apparatus Torque Stability
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Solution Overview
Problem
Existing automatic speed reduction ratio switching apparatuses using viscous resistance media, such as grease, face issues with torque characteristic variations due to temperature changes and potential leakage, affecting the precision and reliability of speed reduction ratio switching.
Innovation Solution
The apparatus employs a slide resistance member, like a packing member, between the internal gear and the carrier, which allows displacement of the internal gear when a predetermined thrust force is applied, maintaining a fixed torque characteristic and preventing fluctuations due to temperature changes, using a simple mechanical structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Extent of automation
If a viscous resistance medium (grease) is used to generate thrust force for speed reduction ratio switching, then the apparatus can achieve automatic switching based on output load changes, but the viscosity varies with temperature changes and leakage may occur, causing torque characteristic variations
Solution Approach 1:
The invention extracts and eliminates the viscous resistance medium (grease) from the system. Instead of using grease to generate thrust force, the patent employs a spring mechanism that directly generates elastic force. This removal of the viscous medium eliminates the problems of temperature-dependent viscosity changes and leakage, while maintaining the automatic switching function through the spring's elastic properties.
Solution Approach 2:
The invention substitutes the viscous resistance medium-based mechanical system with a spring-based elastic force generation system. The spring mechanism provides a more reliable and temperature-stable source of thrust force for actuating the speed reduction ratio switching, replacing the unreliable grease-based system while maintaining the same functional outcome.
2Force
If grease is used as the viscous resistance medium, then thrust force can be generated between the internal gear and planetary gears, but temperature changes cause viscosity variations and potential leakage
Solution Approach 1:
The invention changes the physical parameter basis for force generation from viscous resistance (temperature-dependent) to elastic force (temperature-stable). The spring mechanism generates thrust force through elastic deformation, which is not significantly affected by temperature changes. This parameter change from viscosity-based to elasticity-based force generation resolves the temperature stability issue while maintaining thrust force generation capability.
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 solution ensures high-precision automatic switching of the speed reduction ratio with a reliable, fixed torque characteristic, eliminating the issues of viscosity variations and leakage associated with viscous resistance media.
Implementation Method 1
a slide resistance member arranged between the internal gear and the carrier for regulating movement in the axial directions of the internal gear, and for enabling displacement of the internal gear in the axial directions when the thrust force is applied at or above a predetermined value
Data Source
AI summary
An automatic speed reduction ratio switching apparatus is equipped with a sun gear connected to an input shaft, first and second carriers connected to a feed screw shaft, planetary gears meshed with the sun gear and which are mounted rotatably in the first and second carriers, and an internal gear meshed with the planetary gears and which is capable of movement in an axial direction. A packing member is arranged between the internal gear and the second carrier, for regulating movement in the axial direction of the internal gear, while enabling movement of the internal gear in the axial direction when a thrust force is applied at or above a predetermined value.