Hand Blender 2-Speed Gearbox for Stable Compact Speed Switching
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Solution Overview
Problem
Conventional hand-held blenders lack versatility in stirring speeds, failing to meet the demands of different food types and phases, and their transmission mechanisms are unstable, leading to inefficiencies and increased housing volume.
Innovation Solution
A hand blender with a built-in 2-speed gearbox featuring a coaxial arrangement of input and output shafts, utilizing a combination of constant and differential transmission assemblies, including one-way bearings and bevel gears, to achieve two distinct rotational speeds in the same direction, enhancing adaptability and reducing housing volume.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a conventional single-speed transmission mechanism is used, then the device complexity is low, but the adaptability for different food types and stirring phases is insufficient
Solution Approach 1:
The transmission mechanism is segmented into two distinct transmission paths: a direct transmission path for high-speed operation and a reduced transmission path for low-speed operation. This segmentation allows the single blender to handle different food types and stirring phases effectively, achieving adaptability without requiring multiple separate devices.
Solution Approach 2:
The transmission mechanism dynamically switches between two operational states based on stirring requirements. Through the clutch mechanism and gear engagement, the system can transition from direct transmission (high speed) to reduced transmission (low speed), providing dynamic adaptability for different food processing stages.
2Power
If broadside gear engagement is used to achieve speed reduction, then the transmission ratio can be large, but the housing volume increases due to enlarged gear diameters
Solution Approach 1:
The patent transitions from broadside (parallel) gear engagement to face (axial) gear engagement. This dimensional change in the gear meshing approach allows for a more compact gear arrangement, reducing the radial space required while maintaining the necessary transmission ratio for speed reduction.
Solution Approach 2:
The gear components are arranged in a nested configuration where the pinion gear is positioned within the annular gear structure. This nesting allows the transmission mechanism to occupy minimal space within the housing, reducing overall device volume while achieving the required speed reduction through the engagement of these nested gear elements.
3Power
If broadside gear engagement is used, then speed reduction can be achieved, but the transmission stability is poor
Solution Approach 1:
The clutch mechanism dynamically engages and disengages the connection between the drive shaft and the pinion gear based on rotational direction. This dynamic control ensures that power is transmitted only when needed and in the correct direction, significantly improving transmission stability and preventing unstable or reverse power flow that would occur with passive broadside gear engagement.
Solution Approach 2:
The clutch mechanism acts as an intermediary between the motor and the gear transmission system. It mediates the power transmission by selectively engaging the pinion gear with the drive shaft only during forward rotation, ensuring stable and controlled power flow while preventing unstable transmission during reverse rotation or idle states.
4Productivity
If high speed blending is used initially, then mixing efficiency is improved, but hot food or liquid may splash out causing safety hazards
Solution Approach 1:
The blending process uses periodic alternation between high-speed and low-speed modes. The system operates in cycles: high-speed blending for initial mixing efficiency, followed by low-speed stirring for consolidation and safety. This periodic action maintains productivity while eliminating the continuous high-speed operation that causes splashing hazards.
Solution Approach 2:
The transmission system dynamically adjusts operating speed based on the stirring phase. During initial mixing, the clutch engages direct transmission for high speed. During the consolidation phase, the system switches to reduced transmission for low speed, preventing splashing while maintaining mixing effectiveness. This dynamic speed adjustment resolves the contradiction between productivity and safety.
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 hand blender achieves improved adaptability and flexibility in handling different food types and phases with stable transmission, reducing the risk of splashing hot foods and liquids, while maintaining a compact design.
Implementation Method 1
a one-way bearing configured between the input shaft and the output shaft, and locked to rotate in the first direction
Implementation Method 2
a planetary gear set engaging with the input shaft and configured for transmitting power from the input shaft to the output shaft
Implementation Method 3
the planetary gear set is configured for transmitting power from the input shaft to the output shaft in a state of speed reduction
Implementation Method 4
a bevel gear set arranged under the planetary carrier and engaging with both the planetary carrier and the output shaft
Data Source
AI summary
A hand blender with a built-in 2-speed gearbox, having its output shaft rotating clockwise whenever the motor rotates clockwise or anticlockwise. By using a differential transmission assembly and a one-way bearing, two different output speeds are realized. Thus, different types of food can be processed with different stirring speeds, and a single type of food can be processed with different stirring speeds in different mixing stages of a stirring process.