Drill Bit Torque Coupling With Extended Groove Engagement
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Solution Overview
Problem
Existing devices for transmitting torque from a drill to a drill bit are limited to outputs of up to 2.5 kW, leading to high surface pressure and reduced service life due to inadequate design of inner and outer rotary drivers.
Innovation Solution
The design is enhanced by making the second depth of the second inner rotary drivers equal to the first depth of the first inner rotary drivers, allowing the new tool fitting to connect with a new shank that extends over the first and second outer conical regions, increasing the contact area and enabling higher torque transmission while preventing compatibility with older shanks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the device uses the original design with limited rotary driver depth, then it maintains compatibility with old shanks, but it cannot transmit higher torques and causes high surface pressure
Solution Approach 1:
The patent changes the depth parameter of the second inner rotary drivers, making it equal to the first depth instead of the original second depth. This parameter modification allows the new tool fitting to engage with the extended second longitudinal grooves on the new shank, increasing the contact area and enabling higher torque transmission while reducing surface pressure through distributed loading.
Solution Approach 2:
The patent extends the second longitudinal grooves along the shank to cover additional regions (first outer conical region, groove region, second outer conical region, and cylinder region), effectively utilizing the longitudinal dimension. This dimensional extension provides a larger engagement area for the second inner rotary drivers, enabling higher torque capacity while maintaining acceptable surface pressure levels.
2Power
If the device is designed for higher torque output, then it can handle more powerful drills, but it becomes incompatible with older shanks designed for lower outputs
Solution Approach 1:
The patent modifies the depth parameter of the second inner rotary drivers to match the first depth, which corresponds to the extended depth of the second longitudinal grooves on the new shank. This parameter change creates a new compatibility standard that enables higher power applications while intentionally breaking compatibility with older, shallower grooves, thereby preventing mismatched pairings.
Solution Approach 2:
The patent creates an asymmetric compatibility system where the new tool fitting with modified second inner rotary driver depth is specifically designed to match the new shank with extended second longitudinal grooves. This asymmetric design ensures that only properly upgraded components can be paired together, preventing the use of inadequate old shanks with high-power applications.
3Power
If the second inner rotary drivers have greater depth, then the contact area increases enabling higher torques, but the service life of the original shank design is reduced
Solution Approach 1:
The patent changes the depth parameter of the second inner rotary drivers and simultaneously extends the second longitudinal grooves on the new shank to match this increased depth. This coordinated parameter change ensures that both components are designed for the same load conditions, distributing stresses appropriately and enabling the shank to achieve extended service life even under higher torque conditions.
Solution Approach 2:
The patent extends the second longitudinal grooves along the longitudinal dimension of the shank to cover multiple regions, creating a distributed contact area. This dimensional extension allows the increased depth of the second inner rotary drivers to engage with an extended groove structure, spreading the mechanical loads over a larger volume of the shank material and preventing localized stress concentration that would reduce service life.
Data Source
AI summary
A device for transmitting a torque from a drill to a drill bit includes a shank and a tool fitting. The shank has a first outer conical region, a groove region, and a second outer conical region and has first longitudinal grooves and second longitudinal grooves. The tool fitting has a basic body which has first outer rotary driving grooves, an intermediate element which has first inner rotary drivers, second inner rotary drivers, and first outer rotary drivers, and has a locking device. In the connected state, the first inner rotary drivers engage in the first longitudinal grooves, the second inner rotary drivers engage in the second longitudinal grooves, and the first outer rotary drivers engage in the first outer rotary driving grooves.