Planetary Clutch Torque Modulation via Sun Gear Control
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Solution Overview
Problem
Conventional clutching devices are large, costly, and inefficient, with limited modulating capacity and energy recovery capabilities, making them unsuitable for applications requiring smooth, repeatable torque and speed modulation over extended periods.
Innovation Solution
A clutching device utilizing a planetary gear set with a ring gear, planet carrier, and sun gear, where the modulating device connected to the sun gear controls speed modulation, allowing for energy recovery and efficient operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If conventional friction-based clutches are used for torque modulation, then torque transmission is achieved, but the device size becomes large and manufacturing cost increases
Solution Approach 1:
The clutch device is segmented into distinct functional components: a friction clutch assembly for torque modulation and a centrifugal clutch assembly for engagement control. This segmentation allows each component to be optimized independently, reducing overall size while maintaining torque transmission capability
Solution Approach 2:
The friction clutch assembly is nested within the centrifugal clutch assembly, with the friction plates positioned inside the centrifugal clutch housing. This nested configuration consolidates multiple torque transmission mechanisms into a compact integrated unit, significantly reducing the overall device volume
2Speed
If conventional friction-based clutches are used for speed modulation, then speed control is achieved, but manufacturing precision becomes difficult to maintain due to varying friction coefficients
Solution Approach 1:
A centrifugal governor mechanism serves as an intermediary between the drive shaft and friction clutch engagement. This governor uses centrifugal force to automatically control clutch engagement based on rotational speed, providing precise and repeatable speed modulation without requiring complex control systems or high manufacturing precision
Solution Approach 2:
The centrifugal governor automatically regulates clutch engagement based on the rotational speed of the drive shaft itself. The system uses its own operating parameters (rotational speed) to control its own engagement, eliminating the need for external control systems and improving modulation repeatability
3Duration of action of moving object
If hydraulic clutches are used for extended torque modulation, then modulation capacity is maintained, but energy efficiency decreases due to energy loss as heat
Solution Approach 1:
The patent replaces the hydraulic fluid coupling system with a direct mechanical friction clutch assembly. This mechanical system transmits torque more efficiently with minimal energy loss, while the centrifugal governor provides the necessary control for extended modulation operations without the energy inefficiencies of hydraulic systems
4Volume of moving object
If magnetic clutches are used for torque transmission, then compact size is achieved, but manufacturing cost increases
Solution Approach 1:
The patent changes the operating parameters and material selection from expensive magnetic materials to conventional friction materials and mechanical components. By operating in the friction-based regime rather than magnetic regime, the device achieves comparable compactness through optimized mechanical design while dramatically reducing manufacturing cost
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 solution enables a compact, cost-effective, and efficient clutching device capable of smooth, repeatable torque and speed modulation, with energy recovery, improving system efficiency and automatability.
Implementation Method 1
a planetary gear set connected to a prime mover. The planetary gear set includes a ring gear, a planet carrier with at least one planet and one sun gear disposed in the planet carrier the said planet gear engaged at one side with the ring gear, and at the other side with the sun gear
Data Source
AI summary
A clutching device that achieves torque modulation and/or speed trimming by manipulating only a fraction of torque transferred, but over a wider speed range, is provided. The clutching device has a planetary gear set connected to a prime mover. The planetary gear set includes a ring gear, a planet carrier with at least one planet and one sun gear disposed in the planet carrier the said planet gear engaged at one side with the ring gear, and at the other side with the sun gear. The device further includes a modulating device connected to the sun gear, and an output device connected to the planet carrier. Speed modulation between the prime mover and the output device is controlled by controlling the speed of rotation of the sun gear. Energy from the speed modulation is recoverable by the modulating device.