Threaded Sleeve Triple-Start Design for Perpendicular Assembly
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Solution Overview
Problem
Existing threaded sleeves often tilt during assembly into workpieces, leading to insufficient tensile strength, crack formations, and potential destruction due to asymmetrical stress distribution and inadequate thread anchoring.
Innovation Solution
A threaded sleeve with a core and an outer thread featuring a 25° to 35° flank angle, triple-thread design, and specific lead and thread depth ratios to ensure perpendicular assembly and deep thread anchoring, reducing torque and material deformation while maintaining tensile strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a conventional threaded sleeve is used, then the assembly process is simple, but the threaded sleeve tilts and assembles askew during screwing-in
Solution Approach 1:
The thread is segmented into three independent thread turns (starts) that are axially offset from each other. This segmentation allows each thread turn to independently engage with the workpiece, distributing the engagement forces and preventing lateral tilting during assembly while maintaining perpendicular alignment.
Solution Approach 2:
The invention transitions from a single-thread design to a multi-thread design by adding the axial dimension to thread arrangement. The three thread turns are positioned at different axial locations, creating a three-dimensional thread structure that engages the workpiece at multiple points simultaneously, thereby constraining lateral movement and ensuring perpendicular assembly.
2Ease of operation
If the threaded sleeve is assembled askew, then assembly might be easier, but tensile strength of the connection is insufficient
Solution Approach 1:
The connection strength is enhanced by segmenting the thread into three turns that distribute the load across multiple engagement points. This segmentation ensures that the tensile load is evenly distributed along the threaded sleeve length, preventing stress concentration and maximizing the overall tensile strength of the connection.
Solution Approach 2:
Different regions of the threaded sleeve have optimized local properties: the three thread turns are positioned to provide optimal engagement depth and distribution, while the overall thread geometry (flank angle, lead, thread depth) is locally optimized to balance cutting action with connection strength, ensuring maximum tensile strength throughout the connection.
3Productivity
If askew assembly occurs, then the assembly process continues, but crack formations and heating of the workpiece occur
Solution Approach 1:
The three-segmented thread design guides the threaded sleeve into perpendicular alignment during assembly by distributing engagement forces evenly. This prevents askew assembly that would cause lateral stresses, crack formations, and excessive heating, allowing continuous assembly without workpiece damage.
Solution Approach 2:
The threaded sleeve design incorporates preliminary anti-action by using the three thread turns to preemptively prevent lateral tilting and askew assembly during the screwing-in process. The distributed engagement of the three threads creates stabilizing forces that counteract any tendency toward misalignment before harmful effects can occur.
4Productivity
If askew assembly occurs, then assembly might proceed, but asymmetrical stress distribution and loads cause fracture or destruction
Solution Approach 1:
The three-thread segmentation creates symmetrical and distributed stress distribution across the workpiece. Each thread turn engages at a different axial position, balancing the stress loads and preventing asymmetrical stress concentrations that would lead to fracture or destruction, ensuring workpiece integrity throughout the assembly process.
Data Source
AI summary
The invention relates to a threaded sleeve for screwing into a receiving opening of a workpiece, with a core and a thread mounted outside on the core, wherein the thread has three thread turns, wherein the thread turns have a thread profile, wherein the thread profile has a flank angle of 25° to 35°, wherein with an outer diameter of 8 mm to 14 mm the pitch of the thread is in the range of 0.5 to 1.0 times the outer diameter of the threaded sleeve and with an outer diameter greater than 14 mm to 40 mm, pitch of the thread is in the range of 0.25 to 0.65 times the outer diameter of the threaded sleeve, and wherein the thread depth of the thread profile is in the range of 0.03 times to 0.15 times the outer diameter of the threaded sleeve.