Salad Spinner Drive Gear Shifting for Low-Force High-Speed Spinning
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Solution Overview
Problem
The existing drive devices for salad spinners require high initial forces to accelerate the inner container due to the fixed transmission ratio, limiting user convenience and the achievable speed, which affects the drying efficiency dependent on centrifugal forces.
Innovation Solution
A two-stage gear system that allows the user to switch between gear ratios during operation, with a pinion having at least two ring gears mounted in a fork-shaped bearing element for axial displacement, enabling a change from a lower to a higher gear ratio with reduced tightening forces, and a spring element for automatic return to the starting position.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a fixed transmission ratio is used in the drive device, then the structure is simple, but high initial forces are required to accelerate the inner container
Solution Approach 1:
The patent applies a two-stage gear system with variable transmission ratio that can be dynamically changed during operation. The drive device includes a first gear stage with transmission ratio i1 and a second gear stage with transmission ratio i2, where i2 < i1. This allows the system to adapt the transmission ratio according to operational requirements, reducing the initial accelerating force while maintaining structural feasibility.
Solution Approach 2:
The invention changes the transmission ratio parameter from a fixed value to a variable value that can switch between two stages. By changing the transmission ratio from i1 (higher) to i2 (lower) after initial acceleration, the system optimizes the force characteristics throughout the acceleration process, reducing the peak initial force requirement.
2Ease of operation
If a higher transmission ratio is used to reduce initial forces, then the achievable speed is limited, but user comfort improves
Solution Approach 1:
The patent implements a dynamic transmission ratio change strategy where the system operates in first gear stage (higher ratio i1) during initial acceleration for user comfort, then switches to second gear stage (lower ratio i2) to achieve higher final speeds. This dynamic adaptation resolves the contradiction between comfort and speed achievement.
Solution Approach 2:
The drive process is divided into two periodic phases: initial acceleration phase using first gear stage, and speed increase phase using second gear stage. This periodic switching between gear stages allows the system to optimize performance for each phase, ensuring both user comfort during startup and high speed during operation.
3Productivity
If the pull cable length is increased to provide more acceleration path, then the drying efficiency improves, but the ergonomically justifiable length is exceeded
Solution Approach 1:
The invention changes the transmission ratio parameter during the pull cable operation to optimize the relationship between cable length and drying efficiency. By switching from higher ratio i1 to lower ratio i2, the system extends the effective acceleration capability within the ergonomically acceptable pull cable length range, improving drying efficiency without requiring excessive cable length.
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 easier and more efficient acceleration of the salad spinner with reduced user effort, increasing the achievable speed and drying efficiency by allowing a change in transmission ratio during operation without requiring excessive initial force.
Implementation Method 1
which contains a return spring to rotate the pulley back after the operator has pulled the traction cable, thereby retrieving the traction cable
Implementation Method 2
A pinion is provided between the drive wheel and the driven wheel, which in particular is constantly engaged with the drive wheel, so that it is moved along a path parallel to the pitch circle of the drive wheel with the acceleration of the drive wheel
Implementation Method 3
Another gear wheel is provided on the output side, which can be coupled to the inner container of the salad spinner, in particular by positive locking means
Implementation Method 4
The inner tank is accelerated to a high speed, so that the adhering water is thrown outwards by the centrifugal forces and runs off the tank wall of the outer tank
Data Source
Figure 1
Figure 2
Figure 3a
AI summary
The apparatus (100) has a drive wheel (106) coupled with a pulley (105) to which a traction cable (104) is fixed. A driven gear (107) is coupled with a rotatably mounted inner container, and a multi-stage movably mounted drive pinion (112) is engaged with the drive wheel and an acceleration unit of the driving wheel to be brought into engagement with the driven gear. The pinion is provided with a set of ring gears, which is mounted in a bearing element (111). The bearing element is moved parallel to a rotation axis (114) from a first axial position to a second axial position.