Two-Stage Worm Reducer Structure for Compact High-Ratio Transmission
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Solution Overview
Problem
Current transmission speed reduction devices for industrial robots, such as worm-worm wheel reducers and harmonic reducers, face issues like cumbersome structure, low efficiency, poor precision, and high costs, while planetary reducers require high material and manufacturing standards, making them expensive and unsuitable for precision heavy load applications.
Innovation Solution
A compact transmission speed reduction device incorporating a worm assembly, worm wheel assembly, and output axle with a cylindrical casing design, featuring helical worm teeth and disc-shaped rotary components for two-stage mesh transmission, which reduces friction and simplifies production, enabling high precision and large transmission ratios.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If worm-worm wheel reducer is used, then transmission ratio can be achieved, but structure becomes cumbersome and transmission efficiency decreases
Solution Approach 1:
The patent applies nesting by placing the worm wheel assembly inside the worm assembly, with multiple worm wheel assemblies nested within the spherical cavity formed by upper and lower casings. This nested configuration achieves high transmission ratio while maintaining a compact structure, directly resolving the contradiction between transmission ratio and structural complexity.
2Manufacturing precision
If harmonic reducer is used, then precision can be achieved, but core component deforms periodically and fatigue damage occurs
Solution Approach 1:
The patent divides the transmission system into multiple independent worm wheel assemblies (three evenly distributed around the output axle), each with its own intermediate rotary body and bearing support. This segmentation distributes the mechanical loads across multiple components, preventing periodic deformation and fatigue damage in any single core component, thereby improving reliability while maintaining precision.
3Reliability
If planetary reducer is used, then performance can be improved, but manufacturing precision requirements and cost increase
Solution Approach 1:
The patent introduces intermediate rotary bodies as mediators between the worm wheel teeth and the output axle. These intermediate rotary bodies with smooth grooves simplify the meshing requirements, reducing manufacturing precision demands while maintaining reliable power transmission. The intermediary components enable easier manufacturing compared to direct planetary gear meshing.
4Power
If worm-worm wheel reducer is used, then transmission ratio can be achieved, but running stability deteriorates
Solution Approach 1:
The patent applies local quality by providing dedicated bearing supports at critical locations: first angular contact ball bearings support the input axle, second angular contact ball bearings support the output axle, and deep groove ball bearings support the rotary shafts of worm wheel assemblies. This localized bearing support system enhances running stability at specific critical points while maintaining the overall transmission ratio 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
The device achieves a high-precision, compact, and cost-effective solution for industrial robots, with low friction wear and large load-bearing capacity, suitable for precision heavy load and large transmission ratio scenarios, while maintaining stability and efficiency.
Implementation Method 1
the worm assembly and the worm wheel assembly achieve primary stage mesh transmission there between by means of worm teeth which are provided on the worm assembly and a first worm wheel tooth which is provided on the worm wheel assembly
Implementation Method 2
The worm wheel assembly and the output axle achieve secondary stage mesh transmission by means of an intermediate rotary body which is provided on the worm wheel assembly and a rotary disc assembly which is fixed on the output axle
Implementation Method 3
The inner sides of the lower casing and the upper casing are provided with first worm teeth for meshing with the worm wheel assembly
Implementation Method 4
The circular boss is also centrally provided with a first angular contact ball bearing for supporting an input axle of the worm assembly
Data Source
AI summary
A transmission speed reduction device, comprising: a worm assembly (1) which is located within a container body (2), a worm wheel assembly (3) and an output axle (4); an input axle (11) is provided on the worm assembly (1), while the worm assembly (1) and the worm wheel assembly (3) achieve primary stage mesh transmission there between by means of worm teeth which are provided on the worm assembly (1) and a first worm wheel tooth (34) which is provided on the worm wheel assembly (3); the worm wheel assembly (3) and the output axle (4) achieve secondary stage mesh transmission by means of an intermediate rotary body (32) which is provided on the worm wheel assembly (3) and a rotary disc assembly (5) which is fixed on the output axle (4). The transmission speed reduction device has a compact structure, a large transmission ratio, is high precision, has low friction wear, and is easily applicable in the development of industrial production and manufacturing, while being low cost and being suitable for precision heavy load transmission scenarios having large transmission ratio requirements and volume restrictions, such as joints of industrial robots and the like.