Camshaft Adjuster Output Element Structuring for Torque and Sealing
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Solution Overview
Problem
Existing camshaft adjusters face challenges in efficiently transmitting torque while maintaining effective sealing of oil channels, particularly at the point of connection to the camshaft, which complicates leak testing and limits power transmission.
Innovation Solution
The output element of the camshaft adjuster features a structured contact surface with a structure-free area around the outlet port, designed to enhance torque transmission and sealing, utilizing methods like laser structuring or plasma coating to increase the friction coefficient and ensure reliable sealing during leak testing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If the contact surface is fully structured to increase friction, then torque transmission is improved, but sealing of oil channels is impaired
Solution Approach 1:
The contact surface is divided into two distinct zones: a structured area with elevated friction coefficient for torque transmission, and an unstructured area with low friction coefficient for sealing. This local differentiation allows each zone to optimize its specific function without compromising the other.
Solution Approach 2:
The contact surface is segmented into functionally distinct regions: a first area with structuring for friction-based torque transmission and a second structure-free area for fluid-tight sealing. This segmentation resolves the contradiction by assigning different surface properties to different functional zones.
2Power
If the contact surface is structured to increase torque transmission, then power transmission is improved, but leak testing becomes more difficult
Solution Approach 1:
A structure-free second area is created on the contact surface to provide a smooth, uniform sealing surface that facilitates reliable leak testing, while the first area maintains structuring for power transmission. This local quality differentiation enables both high power transmission and easy detectability of leaks.
3Reliability
If the entire contact surface is used for sealing, then sealing effect is improved, but torque transmission is reduced
Solution Approach 1:
The contact surface is differentiated into a structured first area for friction-based torque transmission and an unstructured second area for fluid-tight sealing. This local quality assignment ensures that each zone contributes optimally to its designated function.
Solution Approach 2:
The contact surface is segmented into functional zones where the first area (with structuring) handles torque transmission and the second area (structure-free) handles sealing. This segmentation allows both functions to coexist without mutual interference.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This design effectively increases torque transmission between the output element and the camshaft while allowing for easy leak testing without impairing the sealing surfaces, achieving a high sealing effect and improved assembly efficiency.
Implementation Method 1
The contact surface has a structuring in order to increase the torque transmission between the output element and the camshaft
Implementation Method 2
the contact surface being structure-free in the area around the outlet port, and this area is designed for sealing the outlet port with respect to the surrounding environment
Data Source
AI summary
An output element (1) of a camshaft adjuster (8) is described, in which the output element (1) has a contact surface (2) for rotatably fixed connection to a camshaft; the contact surface (2) has at least one outlet port (3) of an oil channel (4) of the output element (1), which may be situated opposite an outlet port of an oil channel of the camshaft in order to conduct hydraulic medium from the camshaft into the output element (1); the contact surface (2) has a structuring (6) in order to increase the torque transmission between the output element (1) and the camshaft; this structuring (6) is structure-free in the area (5) around the outlet port (3) and this area (5) is designed for sealing the outlet port (3) with respect to the surrounding environment.