Planetary Transmission Two-Input Ram Speed Control
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Solution Overview
Problem
Conventional power transmission mechanisms in presses have limited control over ram movement and speed, leading to restricted shaping processes due to reliance on clutching and flywheel speed control, and existing solutions like servo presses are expensive and dimensionally large.
Innovation Solution
A compact power transmission mechanism utilizing two separate drive sources, including a flywheel rotated by one drive source and a sun gear rotated by another, with planet gears and a planet carrier to combine rotational energies and adjust output, allowing dynamic control of output revolution and speed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional clutch control and flywheel speed control are used, then the structure is simple, but the control over ram movement and speed is limited
Solution Approach 1:
The patent combines two drive sources (flywheel and sun gear) into a single planetary transmission system where their rotational energies are merged at the planet carrier. This allows versatile control of output revolution and speed while maintaining a compact integrated structure rather than separate control systems.
Solution Approach 2:
The planetary transmission mechanism enables dynamic adjustment of output characteristics by varying the rotation directions and speeds of the two input drive sources. The planet carrier's output can be dynamically controlled to achieve desired ram movement and speed profiles.
2Adaptability or versatility
If servo presses with powerful servo motors are used, then the movement and speed of the ram can be precisely controlled, but the machine becomes expensive and large in dimension
Solution Approach 1:
The patent merges the functions of a large servo motor with a smaller AC motor driving a flywheel into a compact planetary transmission system. The combined rotational energies of both inputs at the planet carrier achieve the required output torque and speed control in a much smaller footprint than a single large servo motor system.
Solution Approach 2:
The planetary transmission mechanism serves multiple functions: it combines power from two different drive sources, provides dynamic speed and torque control, and achieves precise position control of the output - replacing what would traditionally require a large, expensive servo motor system.
3Adaptability or versatility
If a single large servo motor is used to control ram movement, then precise control is achieved, but energy efficiency is reduced
Solution Approach 1:
The patent combines a smaller AC motor driving a flywheel with a smaller servo motor in a planetary transmission system. The flywheel stores kinetic energy and releases it during pressing operations, reducing the peak power demand on the servo motor and improving overall energy efficiency while maintaining precise control capability.
Solution Approach 2:
The flywheel is continuously accelerated by the AC motor to store kinetic energy in advance (pre-charging the flywheel). During the pressing stroke, this stored energy is released to supplement the servo motor's output, reducing energy consumption and improving efficiency while maintaining the required control precision.
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
Enables precise control of ram movement and speed with reduced dimensions and noise, achieving energy efficiency and cost savings by combining torques from both drive sources, such as using a 125 kW servo motor and a 30 kW AC motor to match the performance of a 250 kW servo press.
Implementation Method 1
at least one planet gear which is positioned between said circular gear and sun gear
Implementation Method 2
a flywheel (40) which is rotated by the first drive means (M2)
Implementation Method 3
a planetary gearing is arranged between the shaft sections
Data Source
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AI summary
The invention is a movement transmission mechanism where independent power transfer can be realized to the work spindle (60) from two separate drive sources (M1, M2), characterized by comprising a flywheel (40) rotated by the first drive source; a circular gear (30) fixed to the hub part (43) of said flywheel (40); a sun gear (10) rotated by means of a second drive source; at least one planet gear (20) which is positioned between said circular gear (30) and the sun gear (10); and a planet carrier (110) which carries said sun gear (10) and planet gear (20) and which is rotatably connected to the flywheel (40)