Drill Bit Shank Interface for Higher Torque Without Excess Pressure
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Solution Overview
Problem
Existing devices for transmitting torque from drills to drill bits are limited to outputs of up to 2.5 kW, resulting in high surface pressure and reduced service life due to inadequate design for higher torque applications.
Innovation Solution
The design is enhanced by making the second depth of the inner rotary drivers identical to the first depth, allowing for increased contact area and supporting higher torques, while preventing compatibility with older shanks to ensure operational safety and extending the service life by modifying the shank's groove depth and width to accommodate more powerful drills.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the device is designed for higher torque transmission, then the torque capacity increases, but the surface pressure becomes excessively high damaging the rotary drivers
Solution Approach 1:
The patent combines multiple rotary drivers (first inner rotary drivers, second inner rotary drivers, and first outer rotary drivers) into a single integrated interface. This merging of multiple contact points distributes the torque transmission load across a larger total contact area, thereby reducing the surface pressure on individual drivers while maintaining high torque capacity.
Solution Approach 2:
The patent introduces a multi-dimensional interface structure with rotary drivers arranged in different radial positions (inner and outer drivers) and at different depths. This spatial distribution across multiple dimensions increases the effective contact area without concentrating pressure on a single plane, enabling higher torque transmission with reduced surface pressure.
2Power
If the second inner rotary drivers have greater depth, then the contact area increases enabling higher torques, but compatibility with older shanks is lost
Solution Approach 1:
The patent creates an asymmetric interface design where the new shank features second longitudinal grooves with greater depth and different dimensions compared to older shank designs. This asymmetric configuration allows the second inner rotary drivers to engage properly with the new shank for high torque transmission, while deliberately preventing engagement with older, shallower grooves, thus ensuring compatibility control.
Solution Approach 2:
The patent applies different groove depths and dimensions at specific locations within the shank interface. The second longitudinal grooves are designed with locally optimized greater depth in the regions where second inner rotary drivers engage, while maintaining appropriate dimensions elsewhere. This localized quality enhancement enables high torque capability where needed while controlling overall compatibility.
3Power
If the second longitudinal grooves extend over the first outer conical region and groove region, then the contact area increases for higher torques, but the manufacturing complexity increases
Solution Approach 1:
The patent divides the shank interface into distinct segmented regions: first outer conical region, groove region, second outer conical region, and cylinder region. Each region contains specific longitudinal grooves with optimized characteristics. This segmentation allows for modular manufacturing approaches where each region can be produced and verified independently, reducing overall manufacturing complexity despite the extended groove coverage.
Data Source
AI summary
A device for transmitting a torque produced by a drill includes a shank having a first outer conical region, a groove region, a second outer conical region, and a plurality of first longitudinal grooves extending over the first outer conical region, the groove region, and the second outer conical region and having a plurality of second longitudinal grooves extending over the second outer conical region. A tool fitting has a rotary driving part. The rotary driving part has an inner conical region and an inner driver region where the inner driver region has a plurality of first inner rotary drivers with a first width and first depth and a plurality of second inner rotary drivers with a second width and second depth. The first depth and the second depth are identical and the second longitudinal grooves also extend over the first outer conical region and the groove region.