Eccentric Fastening Element Groove Layout for Lower Tool Wear
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Solution Overview
Problem
The high cost and short service life of fastening elements used in adjustment systems, particularly due to the damage and wear of shaping tools during the production of threads with grooves, which are necessary for secure positioning of eccentric elements, result in expensive production and reduced mechanical load-bearing capacity.
Innovation Solution
A fastening element with a groove that extends partially through the threaded portion, allowing for a simpler and cost-effective production method while maintaining high mechanical load-bearing capacity, featuring a head end portion closer to the head than the threaded portion, and a carrier region that reduces stress concentrations and tool wear, enabling efficient torque transmission and adjustment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a groove is added to the fastening element to position an eccentric element, then the positioning security is improved, but the production cost increases and tool service life decreases
Solution Approach 1:
The groove is positioned to extend at least partially through the threaded portion before thread rolling occurs. This preliminary positioning allows the groove to be formed in a region that will not interfere with the thread rolling process, thereby maintaining tool service life while achieving secure eccentric element positioning.
Solution Approach 2:
The groove is segmented into distinct portions: a head end portion closer to the head than the threaded portion, and a distal end portion. This segmentation allows the groove to fulfill its positioning function while avoiding conflict with thread formation tools, thus reducing production costs and extending tool life.
2Reliability
If a groove is added to the fastening element to position an eccentric element, then the positioning security is improved, but the tool service life decreases
Solution Approach 1:
The groove is pre-positioned to extend through the threaded portion before thread rolling. This preliminary action ensures the groove exists in a safe zone that will not be damaged during thread formation, thereby extending shaping tool service life while maintaining positioning security.
Solution Approach 2:
The groove is divided into segments with the head end portion positioned closer to the head than the threaded portion. This segmentation isolates the groove from the thread rolling zone, preventing tool wear and damage while achieving reliable eccentric element positioning.
3Reliability
If the groove extends through the threaded portion, then the positioning function is improved, but the mechanical load-bearing capacity decreases
Solution Approach 1:
The groove is designed with different characteristics in different regions: the head end portion is positioned closer to the head than the threaded portion, creating a thread-free zone that maintains structural integrity. This local differentiation allows the groove to provide positioning function while preserving the threaded portion's load-bearing capacity.
Solution Approach 2:
The groove is segmented such that it extends at least partially through the threaded portion but with the head end portion closer to the head than the threaded portion. This segmentation creates a transition zone that maintains mechanical strength while enabling the positioning function.
Data Source
AI summary
The invention relates to a fastening element, in particular an eccentric screw, and an adjustment system comprising a fastening element. Fastening elements are already known from the prior art. These are often used in an adjustment system in order, for example, to adjust chassis parts of a vehicle. For this, eccentric elements are often mounted or moulded on the fastening element in order to achieve adjustability in this way. To achieve secure positioning of the eccentric element on the fastening element, it is often guided on the fastening element in a rotationally fixed manner via a groove. The problem with this, however, is that the groove results in particularly expensive production of the fastening element, in particular owing to the shaping of the thread of the fastening element, since the shaping tool for shaping the thread is often damaged and/or severely worn by the groove, in particular the ramp thereof, and therefore these tools have only a short service life. It is therefore the object of the present invention to achieve cost-effective production of a fastening element, in particular for an adjustment system, in which the fastening element should at the same time have a high mechanical load-bearing capacity.