Chamfered Driving Bar Toothing for Reduced Pressing Pressure
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Solution Overview
Problem
Existing length-adjustable linkage technologies require expensive tool adaptations and machine modifications for longer toothed areas, leading to increased production costs and complexity.
Innovation Solution
The first component is produced with chamfers along one broad side, creating a trapezoidal cross-section, reducing the narrow sides and minimizing material displacement during cutting, resulting in a pronounced tooth flank with high load capacity and reduced pressing pressure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional rectangular cross-section components are used with long toothed areas, then the toothing provides sufficient load capacity, but the tool pressures increase and require expensive tool adaptations and machine modifications
Solution Approach 1:
The patent applies local quality by creating a chamfered region specifically at the location where toothing is to be attached. This local geometric modification reduces the cross-sectional dimension only in the area needing toothing, while maintaining the full rectangular cross-section elsewhere to preserve overall structural strength. This targeted approach allows sufficient load capacity in the toothing area without requiring expensive tool adaptations for handling large cross-sections throughout the entire component.
2Ease of manufacture
If the cross-sectional dimension in the toothing area is reduced, then the tool pressures are reduced and manufacturing is simplified, but the tensile and compressive stiffness may be compromised
Solution Approach 1:
The chamfered geometry creates a localized reduction in cross-sectional dimension only where toothing is attached, while the majority of the component retains its full rectangular cross-section. This ensures that the tensile and compressive stiffness of the main component body is preserved, while the reduced dimension at the toothing location facilitates easier manufacturing with lower pressing pressures.
Solution Approach 2:
The chamfer is created as a preliminary geometric feature before the toothing process. This pre-prepared geometric configuration optimizes the material flow and stress distribution during subsequent toothing operations, reducing the pressing pressure required while maintaining the structural integrity of the component.
Data Source
Figure 1~3
AI summary
The application relates to a length-adjustable driving bar for driving bar fittings, in which a first component is provided over a portion of its length with a tooth system (3) on the narrow sides (4, 5) for connection to a second component, the second component engaging in said tooth system by way of a complementary inner tooth system of a toothed shoe, with the result that the first and the second component are coupled in movement in the longitudinal direction. In order, in combination with an improved quality of the toothing, to have to place lower requirements on the tool and the machines, provision is made for the first component to be produced by stamping from a semifinished product which is provided with bevels (10, 11) over its entire length. The toothing is of considerably better quality.