Star Gear Torquer Friction Reduction via Segmented Planetary Gears
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Solution Overview
Problem
Existing planetary gear mechanisms suffer from high energy loss due to friction and complex internal structures, limiting transmission efficiency.
Innovation Solution
A star gear torquer with an optimized internal transmission system, featuring a gear shaft with a driven plate between the planet gears, where the first planet gear is forced by the sun gear and the ring gear is supported by the second planet gear, reducing friction and energy loss through a lever mechanism.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a planetary gear mechanism is used, then transmission stability is improved, but device complexity increases and friction loss increases
Solution Approach 1:
The patent divides the planetary gear mechanism into two separate planetary gear sets (first and second planetary gear sets) with different reduction ratios. Each planetary gear set operates independently but works together to achieve the overall transmission function. This segmentation allows simplification of individual gear set structures while maintaining the stability benefits of planetary transmission, and enables optimized lubrication for each set separately.
Solution Approach 2:
The patent introduces a carrier component that serves as an intermediary between the two planetary gear sets. The carrier transmits motion and torque between the first and second planetary gear sets, coordinating their operations. This intermediary structure simplifies the overall system by providing a clear motion transmission path between the two gear sets, reducing structural complexity while maintaining transmission stability.
2Reliability
If a planetary gear mechanism is used, then transmission stability is improved, but energy loss increases
Solution Approach 1:
The patent introduces a lubrication system that uses lubricant (hydraulic medium) to reduce friction between gear teeth and other moving parts. The lubricant is supplied to specific lubrication points throughout the transmission system, forming a lubrication film that separates contacting surfaces. This hydraulic/lubrication approach significantly reduces friction loss while maintaining the transmission stability provided by the planetary gear mechanism.
Solution Approach 2:
The patent changes the physical parameters of the transmission system by introducing lubricant with specific viscosity characteristics. This parameter change (adding lubrication) fundamentally alters the friction characteristics of the system, reducing energy loss from friction while preserving the mechanical advantage and stability of the planetary gear transmission.
3Productivity
If dual planetary gear sets are used, then transmission efficiency is improved, but device complexity increases
Solution Approach 1:
The patent merges two planetary gear sets with different reduction ratios into a single integrated transmission system. Both planetary gear sets share common components (input shaft, carrier, lubrication system) and work together to achieve compounded reduction. This merging approach achieves high transmission efficiency through dual-stage reduction while avoiding the complexity of completely separate transmission systems, as the two gear sets are coordinated through their shared carrier and input/output connections.
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 design significantly improves transmission efficiency by reducing energy loss and stabilizing the gear train, resulting in a more reliable and efficient power transmission system.
Implementation Method 1
an internal transmission structure thereof is relatively complicated and greater friction occurs between gears, resulting in large energy loss
Implementation Method 2
The transmission system includes a first transmission component, a second transmission component, an input shaft, an output shaft, a sun gear, a rotary plate, a gear shaft, a first planet gear, a second planet gear, a driven plate, and a ring gear
Data Source
AI summary
The present invention provides a star gear torquer, including a base seat, a casing, a first end cover, a second end cover and a transmission system. The transmission system includes: a transmission component; an input shaft that is in sliding connection with the first end cover; an output shaft that is in sliding connection with the second end cover; a sun gear that is fixed to the input shaft; a rotary plate that is in sliding connection with the first end cover; a gear shaft that is in sliding connection with the rotary plate; a first planet gear that is engages with the sun gear; a second planet gear that is engages with a ring gear; the ring gear that is fixed on the casing; and a driven plate that is provided between the first planet gear and the second planet gear.