Screwdriver Drive Geometry With Guide Section for Stable Torque Transfer
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Solution Overview
Problem
Existing screwdriver drive geometries lack an optimal secure connection and efficient torque transmission, leading to subpar screwing performance due to inadequate guide and drive geometry designs.
Innovation Solution
A screwdriver drive geometry with a cylindrical guide section and a driving profile featuring teeth that extend into the guide section, providing a large flank surface for high torque transmission and stable screw engagement, along with a conical base body for easy insertion and a chamfered axial end for precise fitting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the drive profile extends directly from the axial end without a guide section, then the structure is simpler, but the guidance stability and torque transmission are insufficient
Solution Approach 1:
The drive geometry is segmented into two distinct functional sections: a cylindrical guide section for stable insertion and positioning, and a drive section with teeth for torque transmission. This segmentation allows each section to optimize its specific function without compromising the other.
Solution Approach 2:
The guide section extends in the axial dimension, creating a longer insertion path that improves guidance stability. This dimensional extension separates the guidance function from the drive function, allowing both to coexist effectively.
2Ease of operation
If the base body widens conically at a large angle, then insertion is easier, but the flank surface area for torque transmission is reduced
Solution Approach 1:
The base body uses a controlled conical widening with an angle between 5° and 15°, optimizing the balance between insertion ease and flank surface area. This parameter optimization ensures sufficient torque transmission while maintaining easy insertion characteristics.
3Power
If the teeth extend deeply into the guide section, then the flank surface area increases for better torque transmission, but the guiding properties of the guide section are compromised
Solution Approach 1:
The teeth are positioned to extend only partially into the guide section (0.5-1.5 mm), creating local quality differentiation. The guide section maintains its cylindrical form for guidance while the teeth provide localized torque transmission surfaces without compromising the overall guiding function.
4Ease of operation
If the axial end is flat without chamfer, then manufacturing is simpler, but insertion into the screw recess is difficult
Solution Approach 1:
A chamfer is provided at the axial end of the guide section, creating a preliminary insertion path that guides the drive geometry into the screw recess. This preliminary action facilitates easy insertion while adding minimal manufacturing complexity.
Data Source
Figure 1~2
Figure 3~4
Figure 5~6
AI summary
A screwdriver drive geometry (14) is specified, wherein the screwdriver drive geometry (14) has an axial end (16) with which it is inserted into a recess (34) in a screw, wherein the drive geometry (14) has a drive section (18) and a cylindrical guide section (20) beginning at the axial end (16), to which the drive section (18) is connected, wherein the drive section (18) has a base body (22) and a drive profile (26) extending along the base body (22) with laterally outwardly projecting teeth (28), wherein the base body (22) is axially directly connected to the guide section (20) and widens conically in an axial direction away from the guide section (20), and wherein the teeth (28) in the guide section (20) begin at a distance from the axial end (16) and extend along the base body (22) extend. Furthermore, a screwdriver bit (10) and a screw head (32) are specified.