Power Tool Clutch Plate Layout for Adjustable Torque Limits
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Solution Overview
Problem
Current clutch mechanisms for power tools require multiple component types to achieve different maximum rotational torque settings, leading to increased costs and complex operations, as the clutch ball and retaining hole sizes are fixed, making it difficult to adjust the torque without replacing components.
Innovation Solution
A clutch mechanism with a first and second clutch plate, featuring inner and outer retaining holes, and a spherical engagement member that can be selectively positioned in either hole to change the maximum transmissible torque without replacing the second clutch plate, allowing for adjustable torque settings by choosing the engagement member's size and position.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the clutch ball size and retaining hole size are fixed to maintain reliable engagement, then the engagement reliability is improved, but the adaptability to different torque requirements deteriorates
Solution Approach 1:
The patent makes the clutch mechanism adjustable by allowing the clutch ball to be repositioned between multiple retaining holes (inner, middle, outer) on the clutch member. This dynamic reconfiguration enables the same clutch mechanism to adapt to different torque requirements while maintaining reliable engagement through proper design of the retaining holes and spring force.
Solution Approach 2:
The patent changes the positional parameter of the clutch ball relative to the clutch member by providing multiple retaining holes at different positions. By selecting different retaining holes, the effective radius changes, which directly adjusts the maximum transmissible torque according to the formula T = F × r, where T is torque, F is spring force, and r is the radial distance.
2Adaptability or versatility
If multiple types of clutch mechanisms are prepared for different torque settings, then the torque adaptability is improved, but the device complexity and cost increase
Solution Approach 1:
The patent makes a single clutch mechanism universal by incorporating multiple retaining holes in the clutch member. This single component can serve multiple torque settings functions, eliminating the need for multiple separate clutch mechanisms. The clutch ball can be positioned in different retaining holes to achieve different torque characteristics, making one component perform the work of several.
Solution Approach 2:
The patent segments the clutch member by providing multiple distinct retaining holes (inner, middle, outer) instead of a single retaining hole. This segmentation allows the clutch mechanism to be divided into different operational modes or torque settings, enabling one component to replace multiple specialized components.
3Device complexity
If the clutch ball position is fixed by the retaining hole position, then the structural simplicity is improved, but the ease of operation for torque adjustment deteriorates
Solution Approach 1:
The patent introduces adjustability into the otherwise simple structure by allowing the clutch ball to be repositioned between multiple retaining holes. This dynamic feature enables easy torque adjustment without complicating the overall structure, as the adjustment is achieved through a simple positional change rather than complex mechanisms.
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 flexible adjustment of maximum rotational torque without replacing components, reducing the number of required component types and simplifying operations, while maintaining effective torque limitation and transmission.
Implementation Method 1
The engagement member is urged toward the first clutch plate by a spring
Implementation Method 2
a rotational torque is transmitted from the rotating drive shaft to the output shaft when the clutch ball is engaged with the projection
Data Source
AI summary
A clutch mechanism includes a first clutch plate retaining circular columnar engagement members and a second clutch plate retaining spherical engagement members. In the second clutch plate, inner retaining holes and outer retaining holes positioned more radially outward than the inner retaining holes are formed. The outer retaining holes are larger in diameter than the inner retaining holes. On assembly of the clutch mechanism, engagement members are selected from small-diameter spherical engagement members corresponding to the small-diameter inner retaining holes and large-diameter spherical engagement members corresponding to the large-diameter inner retaining holes. The selected engagement members are disposed in the corresponding retaining holes, respectively. The maximum rotational torque is greater when the large-diameter spherical engagement members are selectively disposed than when the small-diameter spherical engagement members are selectively disposed.