Internal Combustion Engine Crankshaft Detection Positioning
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Solution Overview
Problem
The challenge is to enhance the detection accuracy of a detection sensor in an internal combustion engine while minimizing crankshaft deflection, which affects the sensor's positioning and functionality.
Innovation Solution
The internal combustion engine structure incorporates a detection device positioned near an orthogonal virtual line passing through the crankshaft's center, orthogonal to the cylinder's center axis, and includes a balancer shaft to suppress vibration, allowing the detection device to be placed between the balancer shaft and the starting device, thereby reducing deflection and improving accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the detection device is disposed at a suitable position for accurate detection, then detection accuracy is improved, but crankshaft deflection increases
Solution Approach 1:
The patent positions the detection device in a specific spatial dimension (above the crankshaft center in the vertical direction, within a defined angular range) to achieve accurate detection while avoiding the harmful radial position that would cause crankshaft deflection. This dimensional repositioning resolves the contradiction between detection accuracy and crankshaft stability.
Solution Approach 2:
The patent introduces an intermediary positioning approach by defining a specific spatial zone (range A1) between the crankshaft center and the cylinder center axis. This intermediary zone allows the detection device to be positioned optimally for detection while maintaining sufficient distance from the crankshaft to avoid causing deflection.
2Measurement precision
If the detection device is positioned closer to the crankshaft center for better detection, then detection accuracy improves, but the risk of causing crankshaft deflection increases
Solution Approach 1:
The patent applies local quality by creating a specific spatial zone (range A1) with distinct characteristics: close enough to the crankshaft center for accurate detection, but positioned in a localized area above the center where the harmful effect of deflection is minimized. This localized positioning achieves detection accuracy while avoiding the harmful radial proximity.
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 effectively suppresses crankshaft deflection, allowing for improved detection accuracy and efficient use of space, while also providing protection and reducing component count through integrated support members.
Implementation Method 1
a balancer shaft that suppresses vibration of the crankshaft
Data Source
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AI summary
An internal combustion engine structure includes: a crankshaft (10) that converts reciprocating motion of a piston (24) disposed inside a cylinder (12) of an internal combustion engine (2) to be mounted on a vehicle into rotational motion; a case member (11) that houses the crankshaft (10); a balancer shaft (14) that suppresses vibration of the crankshaft (10); a starting device (15) that starts the internal combustion engine (2); and a detection device (16) that is disposed between the balancer shaft (14) and the starting device (15) in a side view and determines the rotation speed of the crankshaft (10).