Planetary Gear Motor with Nested Two-Stage Reduction
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Solution Overview
Problem
Conventional gear motors with high torque output face limitations in size and weight reduction due to strict assembly conditions and limited gear tooth combinations, restricting the freedom in designing reduction ratios.
Innovation Solution
A gear motor with a reduction mechanism featuring a planetary two-stage gear arrayed between the sun gear and internal gear, supported by ball bearings, allowing for flexible gear tooth combinations and adjustable reduction ratios, enabling size and weight reduction while maintaining high torque output.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a multistage planetary gear system is used to achieve high torque output, then torque output is improved, but size and weight reduction cannot be achieved
Solution Approach 1:
The patent applies nesting by placing the planetary two-stage gear inside the planetary gear mechanism, with the small gear or large gear positioned between the sun gear and internal gear. This nested configuration allows the reduction mechanism to achieve high torque output while minimizing size and weight, as the compact nested structure eliminates the need for separate multistage planetary gear assemblies.
2Weight of stationary object
If a compound planetary gear mechanism is used to reduce size, then size reduction is achieved, but design freedom is significantly limited by assembly conditions
Solution Approach 1:
The patent segments the gear mechanism by introducing a planetary two-stage gear with separable small gear and large gear components that can independently mesh with the sun gear and internal gear. This segmentation allows flexible selection of gear tooth combinations and reduction ratios without being constrained by strict assembly conditions, thereby maintaining design freedom while achieving size reduction.
Solution Approach 2:
The patent applies dynamics by allowing the planetary two-stage gear to be configured with variable tooth numbers and reduction ratios. The small gear and large gear can be designed with different tooth counts to achieve various reduction ratios, providing adaptability and versatility in design while maintaining a compact size.
3Manufacturing precision
If strict assembly conditions are applied to enable correct meshing, then meshing accuracy is improved, but the combinations of tooth numbers and reduction ratios are significantly limited
Solution Approach 1:
The patent segments the gear system into modular components (sun gear, planetary two-stage gear with small and large gears, internal gear) that can be independently designed with different tooth numbers. This modular segmentation maintains correct meshing accuracy while enabling a wide range of tooth number combinations and reduction ratios.
Solution Approach 2:
The patent changes the parameters of the gear system by allowing variable tooth numbers on the small gear, large gear, sun gear, and internal gear. By adjusting these parameters, the system achieves both high meshing accuracy and flexibility in selecting tooth number combinations and reduction ratios.
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 prevents shaft instability, achieves significant speed reduction and high torque output, allows for flexible gear ratio selection, and reduces size and weight, enhancing design freedom and cost-effectiveness.
Implementation Method 1
both end portions of the at least a single planetary two-stage gear are supported by ball bearings
Data Source
AI summary
The present invention provides a reduction mechanism in which high torque output can he achieved, thinness and size and weight reduction can be achieved, and the number of teeth of a gear and reduction ratio can be freely set. In a gear motor that includes a reduction mechanism in which a planetary two-stage gear is arrayed between a sun gear of a planetary gear mechanism and an internal gear of a planetary gear mechanism, the reduction mechanism has at least a single planetary two-stage gear arrayed such as to be positioned between the sun gear and the internal gear and including a small gear or a large gear that meshes together with a large gear or a small gear of the planetary two-stage gear, and both end portions of the at least a single planetary two-stage gear are supported by ball bearings.