Bit Holder Torque Transfer Assembly for Impact Damage Reduction
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Solution Overview
Problem
Impact drivers often damage bits and bit holders due to the sudden application of high torque, leading to reduced tool life and increased risk of failure.
Innovation Solution
A torque transfer assembly in the bit holder, comprising an axial movement limiting subassembly and a rotation limiting subassembly, which includes cam bodies and radial members, strategically distributes torque to prevent direct absorption and dissipation, ensuring continued impact energy delivery while reducing stress on components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a bit holder is rigidly made of metallic materials to ensure high strength and durability, then the bit holder can withstand high torque application, but the sudden application of force damages the bit, fastener, or bit holder, reducing tool life
Solution Approach 1:
The bit holder is divided into multiple segments including a drive body, driven body, and torque transfer assembly with cam bodies. This segmentation allows the torque to be distributed across multiple components rather than concentrated in a single rigid structure, reducing stress on individual parts while maintaining overall strength.
Solution Approach 2:
The patent introduces dynamic elements including cam bodies with cam surfaces that convert rotational motion into controlled linear motion, and elastic members that provide flexibility. This dynamic design allows the bit holder to absorb and distribute sudden torque impacts, preventing damage while maintaining durability.
2Force
If high and sudden torque is applied by impact drivers to loosen frozen or over-torqued fasteners, then fastener loosening is achieved, but the sudden force damages the bit, fastener, or bit holder
Solution Approach 1:
The torque transfer assembly with cam bodies and elastic members acts as a cushioning mechanism that absorbs and distributes sudden torque impacts before they reach the bit and fastener. This pre-cushioning prevents damage while still delivering the necessary force to loosen frozen or over-torqued fasteners.
Solution Approach 2:
The cam bodies and torque transfer assembly serve as intermediary components between the drive body and driven body, mediating the transmission of torque. These intermediaries distribute the force more evenly and prevent concentrated stress that would damage the bit or fastener.
3Power
If torque is directly transferred from drive body to driven body, then impact energy is delivered efficiently, but loads are absorbed or dissipated entirely through the bit holder, shortening driver bit life
Solution Approach 1:
The cam bodies convert rotational torque into controlled linear motion, creating a dynamic torque transfer mechanism. This dynamic approach maintains efficient power transmission while distributing loads over time and across multiple components, preventing complete absorption of impact energy by any single part.
Solution Approach 2:
The patent changes the parameters of torque transfer by introducing cam surfaces with specific geometric profiles that control the relationship between rotational input and linear output. This parameter transformation allows efficient energy delivery while modifying the torque characteristics to reduce stress on driver bits.
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 solution extends the life of driver bits and bit holders by distributing torque forces effectively, reducing the likelihood of damage and failure, while maintaining high impact energy delivery.
Implementation Method 1
The rotation limiting subassembly includes a first cam body at a distal end of the drive body and a second cam body at a distal end of the driven body. The first and second cam bodies are configured to transfer a majority of the torque between the drive body and the driven body indirectly via the torque transfer assembly by limiting rotation of the first cam body relative to the second cam body.
Data Source
AI summary
A torque transfer assembly for a bit holder includes an axial movement limiting subassembly and a rotation limiting subassembly. The axial movement limiting subassembly is configured to retain a drive body of the bit holder in proximity to a driven body of the bit holder. The rotation limiting subassembly is configured to cause torque applied to the drive body to be transferred to the driven body. The rotation limiting subassembly includes a first cam body at a distal end of the drive body and a second cam body at a distal end of the driven body. The first and second cam bodies are configured to transfer a majority of the torque between the drive body and the driven body indirectly via the torque transfer assembly by limiting rotation of the first cam body relative to the second cam body.