Transmission System Using Nested Gears and Needle Bearings
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Solution Overview
Problem
Transmission systems require multiple stages to achieve a desired ratio, leading to increased weight and cost due to the need for multiple components and complex designs.
Innovation Solution
A transmission design utilizing single piece gear pairs with varying pitch diameters and needle bearings, along with PTFE washers and knurled shafts, to achieve high ratios while minimizing weight and cost, and allowing for a compact and efficient torque transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If multiple stages are used to achieve a desired transmission ratio, then the transmission ratio is improved, but the weight and cost increase
Solution Approach 1:
The patent combines multiple gear stages into a single integrated transmission unit. The housing contains multiple gear pairs (including planetary gears and spur gears) that are mechanically coupled together, allowing the system to achieve high transmission ratios through a unified structure rather than separate stages. This merging reduces the overall weight by eliminating redundant housing and mounting components that would be required for multiple discrete gearboxes.
2Power
If multiple stages are used to achieve a desired transmission ratio, then the transmission ratio is improved, but the manufacturing cost increases
Solution Approach 1:
The transmission housing serves multiple functions simultaneously: it acts as the structural container, the mounting frame for all gear components, the bearing support structure, and the sealed enclosure for lubrication. This multi-functionality reduces the total component count and simplifies manufacturing, as a single precision-cast housing replaces what would otherwise require multiple separate parts and assembly operations.
Solution Approach 2:
By integrating multiple gear stages into one unified transmission assembly, the patent reduces the number of separate manufacturing processes required. Instead of producing, transporting, and assembling multiple independent gearbox units, the system is manufactured as a single integrated unit, reducing labor costs, assembly complexity, and quality control requirements.
3Power
If multiple stages are used to achieve a desired transmission ratio, then the transmission ratio is improved, but the device complexity increases
Solution Approach 1:
The transmission employs a nested arrangement where planetary gear sets are positioned concentrically around a central sun gear, and additional spur gears are arranged in compact sequences within the same radial space. This nesting allows multiple gear stages to occupy minimal volume and be mechanically coupled through shared mounting points and common lubrication channels, simplifying the overall design while achieving high 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
The design achieves high transmission ratios with reduced weight and cost, enabling efficient torque transmission and compactness, while maintaining reliability and minimizing the risk of component failure.
Implementation Method 1
A needle bearing supports the double gear assembly
Implementation Method 2
PTFE washers and knurled shafts
Data Source
AI summary
A primary objective of the present embodiments is to provide a transmission that may be simple in design, low in weight, and have a reduced cost of manufacture while being capable of a relatively high ratio.