Drill Bit Torque Coupling with Nested Drivers for Higher Load
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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 the design of the tool fitting and shank.
Innovation Solution
The device incorporates lower rotary drivers and grooves on the intermediate element to increase the contact area without increasing the height of the rotary driving region, allowing for the transmission of higher torques and forces, and ensures compatibility with new and old components by varying depths and widths of the rotary drivers and grooves.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the existing device design is used, then compatibility with old components is maintained, but the torque transmission capability is limited to 2.5 kW
Solution Approach 1:
The intermediate element is divided into distinct functional regions: an inner driver region with rotary drivers for engaging longitudinal grooves, and an outer driver region with rotary drivers for engaging rotary driving grooves. This segmentation allows each region to be optimized independently for different torque transmission requirements while maintaining overall compatibility
Solution Approach 2:
Different regions of the intermediate element have different local properties: the inner driver region has rotary drivers with specific width and depth for longitudinal groove engagement, while the outer driver region has rotary drivers with different dimensions for rotary driving groove engagement. This local differentiation enables the single intermediate element to interface with both old and new component designs
2Power
If the contact area between basic body and intermediate element is increased, then higher torques can be transmitted, but the height of the rotary driving region must be increased
Solution Approach 1:
Instead of increasing the contact area by extending the height of the rotary driving region (one dimension), the invention utilizes the radial and axial dimensions by adding both inner and outer driver regions. This multi-dimensional approach increases the total contact area without increasing the height of the rotary driving region
Solution Approach 2:
The inner driver region and outer driver region are arranged concentrically, with the inner region nested within the outer region. This nested arrangement maximizes the contact area within the available radial space without requiring additional height
3Area of stationary object
If the surface pressure between basic body and intermediate element is increased, then smaller contact area is needed, but the service life is reduced
Solution Approach 1:
The contact area is segmented into multiple distinct regions (inner driver contact area and outer driver contact area), which distributes the load across multiple separation surfaces. This segmentation reduces the surface pressure in each individual region while maintaining sufficient total contact area for high torque transmission
Solution Approach 2:
The invention transitions from a single-plane contact interface to a multi-dimensional contact system with both inner and outer driver regions engaged at different radial positions. This dimensional expansion increases the total contact area, thereby reducing the surface pressure at each contact point and extending service life
Data Source
AI summary
A device for transmitting a torque produced by 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 longitudinal grooves. The tool fitting has a basic body which has a rotary driving region with outer rotary driving grooves, an intermediate element which has an inner driver region with inner rotary drivers and an outer driver region with outer rotary drivers, and a locking device. In the connected state, the inner rotary drivers engage in the longitudinal grooves and the outer rotary drivers engage in the outer rotary driving grooves. Lower rotary drivers are arranged on the base surface of the intermediate element where the lower rotary drivers, in the connected state, interact with lower rotary driving grooves in the rotary driving region of the basic body.