Composite Main Bearing Structure for Lightweight Speed Reducers
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Solution Overview
Problem
Conventional eccentric oscillation speed reducers face challenges in achieving both weight reduction and rigidity enhancement, often resulting in compromised strength and increased temperature-related issues due to the use of resin parts, which can lead to deformation and malfunction.
Innovation Solution
The design incorporates an internal gear with outer pins and a carrier featuring a thermally conductive material for improved heat dissipation and rigidity, with one sliding surface made of resin and the other of a wear-resistant, thermally conductive material, and includes features like inclined sliding surfaces and grooves to prevent dust and grease ingress.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If resin parts are used to reduce weight, then weight reduction is achieved, but strength and heat dissipation deteriorate
Solution Approach 1:
The patent applies composite materials by combining resin and metal in the main bearing structure. Specifically, the inner sliding surface is made of resin while the outer sliding surface is made of metal, creating a composite bearing that leverages the weight advantages of resin and the strength/heat dissipation advantages of metal. This resolves the contradiction by achieving weight reduction through resin usage while maintaining mechanical strength through metal components in critical load-bearing areas.
2Weight of moving object
If resin parts are used to reduce weight, then weight reduction is achieved, but heat dissipation deteriorates
Solution Approach 1:
The composite main bearing structure with resin inner sliding surface and metal outer sliding surface addresses heat dissipation by positioning the thermally conductive metal material at the outer sliding surface that contacts the carrier. This configuration allows heat generated during operation to be effectively conducted away through the metal component, preventing temperature buildup while maintaining the overall weight reduction benefit of using resin for the casing and inner components.
3Weight of moving object
If many resin parts are used to achieve weight reduction, then weight reduction is achieved, but reliability deteriorates due to lack of strength
Solution Approach 1:
The patent improves reliability by strategically using metal material for the outer sliding surface of the main bearing, which is a critical component subject to wear and load. This metal component prevents wear-related failures and structural failures that would occur with pure resin construction, thereby reducing the defect rate while maintaining weight reduction through resin usage in non-critical areas like the casing.
4Weight of moving object
If resin parts are used, then weight reduction is achieved, but rigidity deteriorates
Solution Approach 1:
The composite main bearing structure enhances rigidity by incorporating the metal outer sliding surface that provides structural stiffness during operation. The metal component maintains the geometric stability and load-bearing rigidity of the bearing assembly, preventing the rigidity deterioration that would result from using resin alone, while the overall structure remains lightweight due to resin construction of the casing and other components.
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 effectively reduces weight and size while enhancing rigidity and heat dissipation, preventing failures and ensuring reliable operation by maintaining mechanical strength and preventing temperature-related issues.
Implementation Method 1
the other of the inner and outer sliding surfaces is made of a thermally conductive material that is more wear-resistant than the resin
Implementation Method 2
One of the inner and outer sliding surfaces is made of resin
Data Source
AI summary
A speed reducer relating to one aspect of the present disclosure includes: an internal gear having a casing and a plurality of outer pins, where the casing surrounds a main axis, and the outer pins are rotatably arranged in pin grooves provided on an inner periphery of the casing; an external gear meshing with the internal gear; an eccentric body for oscillating the external gear; a carrier rotatable relative to the casing; and a main bearing having an inner sliding surface and an outer sliding surface, where the inner sliding surface is rotatable integrally with the casing, and the outer sliding surface is rotatable integrally with the carrier. One of the inner and outer sliding surfaces is made of resin, and the other of the inner and outer sliding surfaces is made of a thermally conductive material that is more wear-resistant than the resin.