Multi-Speed Planetary Gear Unit for Food Processor Tool Optimization
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Solution Overview
Problem
Existing food processors face challenges in optimizing the speed and torque for inserted tools in mixing or kneading mechanisms, leading to high power consumption and noise emissions, as they often require a single coupling piece to meet diverse rotational speed and torque requirements.
Innovation Solution
A gear unit with a first and second gear stage, where the first gear stage includes a sun gear and planet gear, and the second gear stage provides a separate coupling piece that rotates with a different intrinsic rotation, allowing for different tools to be driven with specific rotational speeds and torques, reducing motor power requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a single coupling piece is used to drive tools in mixing or kneading mechanisms, then the device structure is simple, but the rotational speed and torque cannot be optimized for different tool requirements, leading to high power consumption
Solution Approach 1:
The gear unit is segmented into multiple independent gear stages (first gear stage with first sun gear and first planet gear, second gear stage with second sun gear and second planet gear), each capable of providing different transmission ratios. This segmentation allows the system to offer multiple rotational speed and torque options without requiring a completely redesign for each tool type, thus improving adaptability while controlling complexity.
Solution Approach 2:
The gear unit is designed as a universal drive system that can accommodate different tool requirements through multiple coupling pieces (first coupling piece and second coupling piece). Each coupling piece can be selectively engaged with different gear stages, allowing the same gear unit to serve multiple functions and drive various tools with optimal speed and torque characteristics.
2Adaptability or versatility
If high motor power is used to meet diverse rotational speed and torque requirements, then all tool requirements can be satisfied, but power consumption and noise emissions increase
Solution Approach 1:
The system changes transmission ratio parameters through different gear stage combinations. The first gear stage and second gear stage provide different transmission ratios, allowing the motor to operate at optimal power levels for each specific tool requirement. This parameter adjustment capability enables the motor to deliver appropriate power levels rather than consistently operating at high power, reducing overall energy consumption.
3Ease of operation
If a single gear ratio is used for all tools, then the gear unit structure is simple, but the rotational speed and torque are not optimized for specific tool requirements
Solution Approach 1:
The gear unit provides dynamic adaptability through multiple gear stages that can be selectively engaged. The first coupling piece and second coupling piece can be connected to different gear stages based on the specific tool requirements, allowing the system to dynamically adjust transmission ratios rather than being fixed. This dynamic capability improves operational efficiency while maintaining a relatively compact structure.
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 solution enables efficient operation of various tools with appropriate speed and torque, lowering overall motor power consumption and noise, as the gear unit can select the optimal transmission ratio for each tool, resulting in a more economical and quieter food processor.
Implementation Method 1
a planetary gear with bevel gearing, the planetary gear rotates with an inclined axis and intersects the axis of the central wheel with its axis. The planet wheel meshes with the teeth of the central wheel as well as with those of an internally toothed outer ring gear
Implementation Method 2
gear units for food processors fulfill the task of converting a rotational speed and torque provided by an input shaft into the respective rotational speeds and torques of one or more power take-off shafts
Data Source
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AI summary
A gear unit (4) for a food processor is described, which gear unit (4) comprises a first gear stage (7, 37, 46) with a first sun gear (20, 42, 47) and at least one first planetary gear (25, 43, 48) which is in engagement with the first sun gear and is mounted rotatably on a planetary carrier (23, 51), and a first coupling piece (24, 45, 50) for receiving a first shaft of a first tool, wherein the first coupling piece (24, 45, 50) is connected to a first planetary gear (25, 43, 48) of the first gear stage (7, 37, 46). In addition to the first coupling piece (24, 45, 50), a second coupling piece (22, 44, 53) for receiving a second shaft of a second tool is mounted rotatably on or in the planetary carrier (23, 51), wherein the gear unit (4) is designed to drive the second coupling piece (22, 44, 53) in such a way that the second coupling piece (22, 44, 53) corotates with the planetary carrier (23, 51) with a different characteristic rotation than the first coupling piece (24, 45, 50). As a result, every tool can be driven at a suitable rotary speed, with a suitable rotational direction and with a suitable torque for the respective tool.