Toothed Shaft Assembly Geometry for Twist-Resistant Camshafts
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Solution Overview
Problem
Existing methods for assembling camshafts, such as heating or cooling to facilitate cam placement, are time-consuming and lack precision in axial alignment and twist resistance, limiting flexibility in cam choice and geometry.
Innovation Solution
A tooth shaft with interlinked sections featuring larger tooth thickness and flank angles in the assembly area, allowing functional elements to be easily pressed onto the shaft, forming a resilient connection with enhanced twist resistance without additional components or complex processing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If heating or cooling processes are used to facilitate cam placement on the shaft, then the ease of assembly is improved, but the assembly time increases and manufacturing complexity increases
Solution Approach 1:
The invention changes the geometric parameters of the shaft profile, specifically creating sections with different tooth thicknesses (e.g., thicker teeth in the assembly section compared to the interlinked section). This geometric parameter change allows functional elements to be pressed onto the shaft without requiring thermal expansion or contraction, thereby reducing assembly time while maintaining ease of assembly.
2Ease of operation
If heating or cooling processes are used to facilitate cam placement on the shaft, then the ease of assembly is improved, but the device complexity increases
Solution Approach 1:
The invention modifies the shaft's geometric parameters by creating sections with varying tooth thicknesses and profiles. This design allows functional elements to be assembled by pressing without requiring complex heating or cooling equipment, thereby reducing manufacturing complexity while maintaining ease of assembly.
3Strength
If cast iron camshafts are used to ensure functional elements are firmly connected, then the twist resistance is improved, but the weight increases and design flexibility decreases
Solution Approach 1:
The invention applies local quality by creating specific sections of the shaft with different geometric properties. The assembly section has thicker teeth and modified profile compared to the interlinked section, providing localized strength and twist resistance only where functional elements are attached, rather than making the entire shaft heavy like a cast iron camshaft.
Solution Approach 2:
The shaft is segmented into different functional sections: an interlinked section with standard tooth thickness for connection purposes, and an assembly section with increased tooth thickness for mounting functional elements. This segmentation allows the shaft to achieve necessary strength at specific locations without increasing overall weight.
4Strength
If cast iron camshafts are used to ensure functional elements are firmly connected, then the twist resistance is improved, but the adaptability decreases
Solution Approach 1:
The invention provides local quality enhancement at the assembly section where functional elements are mounted, with thicker teeth providing twist resistance. The rest of the shaft maintains standard geometry, allowing for design flexibility and adaptability in choosing different functional elements and their positions, unlike rigid cast iron camshafts.
5Strength
If the tooth thickness in the assembly section is increased to prevent twisting, then the twist resistance is improved, but the manufacturing complexity increases
Solution Approach 1:
The invention changes the tooth thickness parameter locally in the assembly section to provide twist resistance. This can be achieved through standard manufacturing processes by creating sections with different geometric parameters, avoiding the need for complex additional components or assembly steps.
Data Source
Figure 1a~4
AI summary
The invention relates to a toothed shaft (1), having a toothed section (1a), in which teeth (2a) are formed on the lateral surface of the toothed shaft (1), which extend parallel to the axis of rotation of the toothed shaft (1). The invention is characterized in that a mounting section (1b) having teeth (2b) adjoins the toothed section (1a), wherein the number and the radial position of the teeth (2b) in the mounting section (1b) correspond to the number and the radial position of the teeth (2a) in the toothed section (1a), and wherein at least one tooth thickness (db) of the teeth (2b) in the mounting section (2a) is greater than a tooth thickness (da) in the toothed section (1a), or at least one dedendum circle diameter (fb) of the teeth (2b) in the mounting section (1b) is greater than the dedendum circle diameter (fa) in the toothed section (1a), or at least one addendum circle diameter (kb) of the teeth (2b) in the mounting section (1b) is greater than the addendum circle diameter (ka) in the toothed section (1a).