Threaded Bushing with Self-Tapping Thread and Positioning Tool
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Solution Overview
Problem
The existing methods for renewing or introducing threads in a bore are labor-intensive and require significant manufacturing effort, involving thread cutting and chip removal, which can be cumbersome, especially in confined spaces.
Innovation Solution
A threaded bushing with a self-tapping external thread and a tool that allows for axial positioning and torque application, eliminating the need for thread cutting and chip removal, by using a tool with a threaded shank that supports the bushing and adjusts to prevent self-locking, enabling easy insertion and formation of the internal thread.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If traditional thread cutting method is used to renew or introduce threads in a bore, then the thread can be formed, but the process is labor-intensive and requires significant manufacturing effort with chip removal
Solution Approach 1:
The threaded bushing is designed with a self-tapping external thread that automatically forms the mating thread in the bore during the screwing-in process. The bushing serves itself by creating the thread connection without requiring separate thread cutting operations, thereby eliminating chip removal and reducing manufacturing effort.
2Ease of operation
If self-tapping thread is used on the threaded bush, then thread cutting and chip removal are eliminated, but the bushing requires precise axial positioning and support during screwing in
Solution Approach 1:
A specialized tool with a threaded shank acts as an intermediary between the operator and the threaded bushing. The tool engages with the internal thread of the bushing, provides axial positioning, applies torque during screwing in, and prevents deformation of the bushing. This mediator simplifies the operation while managing the positioning and support requirements.
3Strength
If the threaded bushing is made of hardened steel for screwing into aluminum, then the connection strength is improved, but the bushing is more prone to deformation during the screwing-in process
Solution Approach 1:
The specialized tool with a threaded shank serves as a mediator that distributes and controls the forces applied during the screwing-in process. By engaging with the internal thread and providing axial support, the tool prevents the hardened steel bushing from deforming while enabling it to cut into the aluminum component and create a strong connection.
4Ease of operation
If the internal thread reaches all the way to the screw-in end, then the thread connection is complete, but the bushing cannot be properly supported during screwing in
Solution Approach 1:
The internal thread is designed to start at a certain distance from the screw-in end, leaving the front region of the bushing smooth and uninterrupted. This local differentiation allows the front region to be properly supported by the specialized tool during screwing in, preventing deformation, while the threaded region provides the complete thread connection when engaged with the component.
Data Source
Figure 1~5
Figure 2~3
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AI summary
The invention relates to a threaded bush, for use when renewing a screw thread in a bore or when initially introducing a screw thread into a bore. At one end the threaded bush comprises a collar (1), which restricts the screwing in of the threaded bush and thus permits exact positioning of the threaded bush in the axial direction. On its outer side the threaded bush comprises a thread-forming thread (6), the screw pitch of which gradually increases from the screw-in end. By screwing in the threaded bush, the bush forms the counter thread in the wall of the bore itself. The previously necessary step of cutting the counter thread and the resulting chips can thus be dispensed with.