Camshaft Position Encoder Tab Geometry for Accurate Hall Sensing
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Solution Overview
Problem
The material displacement caused by bending in conventional camshaft position encoders leads to reduced signal detection accuracy, affecting the precision of rotational position determination.
Innovation Solution
The design includes a signal tab with a radially outer section bent toward the axial direction, featuring two opposite recesses and a tapered axial end face, reducing thickness and improving Hall voltage precision, along with a manufacturing method that integrates punching and bending in a single work step.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the signal tab is bent toward the axial direction to improve signal detection, then the position accuracy is improved, but material displacement occurs at the transition from base body to signal tab
Solution Approach 1:
The signal tab is divided into three distinct sections: a base section integrated with the base body, a radial signal section extending outward, and an axial signal section bent toward the axial direction. This segmentation allows each section to be optimized independently, with the transition zones designed to minimize material displacement while maintaining signal detection accuracy.
Solution Approach 2:
Two recesses are pre-formed in the base body at the locations where the signal tab will be attached. These recesses are prepared in advance to receive the bent axial signal section, ensuring proper alignment and reducing material displacement during the bending process by providing a predetermined receiving geometry.
2Measurement precision
If the signal tab thickness is reduced to improve Hall voltage precision, then the rotational position determination precision is improved, but the structural strength may be compromised
Solution Approach 1:
The signal tab exhibits varying thickness across different sections: the radial signal section has a reduced thickness to improve Hall voltage precision and signal detection accuracy, while the base section integrated with the base body maintains a greater thickness to provide structural strength and rigidity. This local differentiation of thickness allows simultaneous optimization of both measurement precision and structural integrity.
3Measurement precision
If the signal tab is bent toward the axial direction to reduce thickness, then the Hall voltage precision is improved, but material accumulation occurs at the transition zone
Solution Approach 1:
Two recesses are extracted or removed from the base body at the transition zones where the signal tab will be attached. These recesses specifically accommodate the bent axial signal section, removing the material that would otherwise accumulate during the bending process. This extraction of material in advance prevents material accumulation and ensures precise geometric relationships between the base body and signal tab.
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 enhances the precision of rotational position determination and simplifies manufacturing, reducing material accumulation and operational costs.
Implementation Method 1
The current position of the position encoder and thus also of the camshaft as well as the direction of rotation of the camshaft is detected by means of a stationary sensor, i.e., a sensor not following the rotary movement of the camshaft, for example a Hall sensor in the form of a change of the Hall voltage
Data Source
AI summary
A position encoder for a camshaft is disclosed. The position encoder includes an annular base body arranged in a base plane and having a central longitudinal axis extending vertically in relation to the base plane along an axial direction. At least one signal tab projecting radially outward integrally formed on an outer circumference of the base body. One recess respectively is provided at a transition to the bent signal section on two sides delimiting the signal tab in the circumferential direction. An axial end face of the bent signal section of the signal tab tapers at least in a tapered section in a longitudinal section along the axial direction, from radially outwards to radially inwards toward the base body.