Multi-Stage Planetary Gear Train for High-Torque Stamping Presses
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Solution Overview
Problem
Existing gear train units with multiple planetary stages face excessive mechanical stress and high costs due to the need for rigid materials, limiting the transmission of high powers at low rotational speeds.
Innovation Solution
A gear train unit design where each planetary stage's sun gear is connected torsionally rigidly to the planet carrier of the preceding stage, with a driving element supported by roller bearings, allowing for compact, robust, and cost-effective transmission of high powers, and featuring a switchable transmission ratio for adaptable operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If traditional planetary gear train stages are used with rigid materials to withstand extreme mechanical stress, then the gear components can handle high torques, but the cost increases significantly and the power transmission capability is unnecessarily limited
Solution Approach 1:
The gear train is divided into multiple planetary stages connected in series, where each stage handles a portion of the torque multiplication. This segmentation allows each component to be optimized for its specific load conditions rather than requiring all components to withstand maximum stress, reducing material costs while maintaining strength where needed.
Solution Approach 2:
The planet carrier of one planetary stage is directly integrated with the sun gear of the next stage, creating a compact multi-stage configuration. This merging eliminates the need for additional intermediate components and reduces the overall structural complexity, allowing for cost-effective manufacturing while achieving high torque multiplication through the cascaded stages.
2Strength
If traditional planetary gear train stages are used with rigid materials, then the gear components can handle high torques, but the overall size and complexity of the gear unit increases
Solution Approach 1:
The planet carrier of each planetary stage is directly integrated with the sun gear of the subsequent stage, creating a compact cascaded configuration. This merging of components reduces the number of separate parts and simplifies the overall structure while achieving high torque multiplication through the series connection of multiple planetary stages.
Solution Approach 2:
Multiple planetary stages are nested within each other in a compact arrangement, with each stage contained within the structure of the previous stage. This nesting approach allows the gear train to achieve high torque multiplication in a compact package with reduced structural complexity compared to traditional distributed arrangements.
3Power
If multiple planetary gear train stages are connected one after the other, then high torques at low rotational speeds can be achieved, but the components are subjected to extreme mechanical stress
Solution Approach 1:
The total torque multiplication requirement is divided across multiple planetary stages, with each stage handling a manageable portion of the stress. This segmentation of the power transmission function allows each component to operate within reasonable stress limits while collectively achieving the required high torque output at low speeds.
Solution Approach 2:
The gear train incorporates elements that allow for dynamic load distribution across the planetary gears and carriers. The direct integration of planet carriers with subsequent sun gears creates a flexible structure that can dynamically adjust stress distribution, preventing any single component from being subjected to extreme mechanical stress while maintaining high torque capability.
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 enables efficient, cost-effective, and robust transmission of high powers while maintaining compactness and stability, allowing for operation at both high and low speeds with minimal energy loss, suitable for applications like punching presses.
Implementation Method 1
The driving element is supported in the region of its both ends in a rotatable manner about its longitudinal axis by means of first bearings according to the claims, which are preferably formed as roller bearings
Implementation Method 2
the sun gear of each following planetary gear train stage in force direction is formed by the planet carrier of the preceding planetary gear train stage or is connected or connectable with said planet carrier in a torsionally rigid manner in rotational direction of this planet carrier
Data Source
AI summary
The invention relates to a gear train unit, comprising a plurality of planetary gear train stages, which are connected one after the other and which each comprise a ring gear, a sun gear, and a plurality of planet gears supported on a planet carrier, wherein the sun gear of each following planetary gear train stage is formed by the planet carrier of the preceding planetary gear train stage. The gear train unit comprises a driving element, which forms the sun gear of the first planetary gear train stage, and an output element, which forms the planet carrier of the last of the gear planetary gear train stages connected one after the other. The driving element is supported by means of first bearings arranged in the region of ends of the driving element, in such a way that the driving element can rotate about a longitudinal axis of the driving element, and at least some of the planet carriers of the planetary gear train stages are supported on the driving element in the region between the first bearings by means of bearings. The invention makes it possible to provide a gear train unit having a plurality of planetary gear train stages connected one after the other that is economical, extremely robust, and very compact and that additionally can transmit very high power.