Inclined Pulser Ring Layout for Compact Crankshaft Speed Sensing
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Solution Overview
Problem
Conventional rotation speed detecting apparatuses for internal combustion engines face challenges in achieving high detection accuracy while maintaining a compact size, as increasing the diameter of the pulser ring and the number of teeth leads to increased space occupation and size.
Innovation Solution
The apparatus features a pulser ring with a detected body composed of recess-projection teeth, where the detected surface is inclined to be closer to the outside of the crankshaft in the axial direction as it moves further from the axis in the radial direction, and a detector with an inclined axis line to oppose the detected surface, allowing for compact placement and reduced vibration influence.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the diameter of the pulser ring is increased to improve detection accuracy, then the detection accuracy of rotation speed is improved, but the space occupied by the pulser ring increases and the size of the rotation speed detecting apparatus becomes large
Solution Approach 1:
The detected surface of the pulser ring is configured to be inclined relative to the radial direction, and the detector is positioned at an inclined angle relative to the crankshaft axis. This dimensional reorientation allows the detector to effectively detect teeth on a larger-diameter pulser ring without requiring the detector itself to be located at a large radial distance, thereby improving detection accuracy while controlling the overall apparatus size.
2Measurement precision
If the number of teeth of the detected body is increased to improve detection accuracy, then the detection accuracy of rotation speed is improved, but the space occupied by the pulser ring increases
Solution Approach 1:
By inclining the detected surface and positioning the detector at an inclined angle, the effective detection radius is increased without proportionally increasing the radial space occupied. This allows more teeth to be arranged on the pulser ring circumference, improving detection accuracy while minimizing the increase in apparatus area.
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 configuration enhances detection accuracy and reduces the radial protrusion of the detected body, enabling a compact and high-accuracy rotation speed detecting apparatus that effectively handles increased pulser ring diameter and minimizes vibration impact.
Implementation Method 1
a detector (52) that detects rotation speed of the crankshaft (25) by detecting the detected body (55)
Data Source
AI summary
In a rotation speed detecting apparatus of an internal combustion engine having a rotor supported by an end part of the crankshaft, a pulser ring that has a detected body composed of recess-projection teeth and rotates integrally with the rotor, and a detector that detects the rotation speed of the crankshaft by detecting the detected body, the detected body has a detected surface opposed to the detector, and the detected surface is inclined in such a manner as to be located closer to the outside of the crankshaft in the axial direction of the crankshaft as getting more apart from an axis line of the crankshaft in the radial direction. In the detector, an axis line of the detector is inclined with respect to the axis line of the crankshaft in such a manner that the detector is opposed to the detected surface.