Rotating Body Marking for Balanced Optical Speed Measurement
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Solution Overview
Problem
Existing methods for measuring the rotational speed of rotating bodies, such as turbochargers, often disrupt the rotational balance and are inaccurate due to the addition of separate components or uneven application of markings like black paint, and may require dedicated designs for magnetic or optical sensors.
Innovation Solution
A rotating body with a measurement surface featuring a first and second measurement region, where the second region includes a marking that reflects light in a direction different from the first, allowing for accurate rotational speed measurement without disturbing the balance, using optical sensors like laser sensors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a separate component (magnetic sensor, optical sensor, or reflector) is added to measure rotational speed, then measurement capability is improved, but device complexity and interference with rotational balance worsen
Solution Approach 1:
The patent combines the measurement marking directly with the rotating body itself, eliminating the need for separate measurement components. The rotating body serves dual purposes: it is both the object being measured and the carrier of the measurement marking, thereby reducing device complexity while maintaining measurement precision.
Solution Approach 2:
The rotating body provides its own measurement marking without requiring external components. The marking is formed directly on the rotating body's surface, allowing it to serve its own measurement needs and eliminating dependency on separate measurement devices that could interfere with rotational balance.
2Measurement precision
If black paint is applied to mark the rotating body for measurement, then measurement capability is improved, but manufacturing precision worsens due to uneven application
Solution Approach 1:
The patent replaces manual painting processes with laser processing to form the measurement marking. This substitution of mechanical/manual methods with automated laser processing eliminates uneven application issues and ensures high manufacturing precision while maintaining clear measurement signals.
Solution Approach 2:
The patent changes the method of creating the marking from chemical (paint application) to physical (laser processing). This parameter change in the marking creation process eliminates the variability associated with manual painting and provides consistent, precise markings that do not affect the rotating body's balance.
3Measurement precision
If a through hole with optical sensor and reflector is used for measurement, then measurement capability is improved, but device complexity and interference with rotational balance worsen
Solution Approach 1:
The patent extracts the measurement marking from a separate component and integrates it directly into the rotating body. By taking out the need for separate reflectors or optical components attached to the rotating body, the solution simplifies the overall structure and eliminates the complexity of through holes and additional parts.
Solution Approach 2:
The rotating body is designed to serve multiple functions: it is both the operational component and the carrier of the measurement marking. This multi-functionality eliminates the need for separate measurement components and structural modifications like through holes, thereby reducing device complexity while maintaining measurement precision.
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
The system accurately measures rotational speed while maintaining the rotational balance of the rotating body, reducing interference risks and avoiding the need for separate components, and is compatible with general-purpose sensors.
Implementation Method 1
an optical sensor disposed at a position facing a measurement surface being a portion of an outer surface of the rotating body, the optical sensor being configured to irradiate the measurement surface with measurement light and receive reflected light of the measurement light from the measurement surface
Data Source
AI summary
A rotating body that is rotatable about a rotational axis, includes an outer surface including a measurement surface that reflects a measurement light received from an optical sensor, the measurement light reflected producing a reflected light. The measurement surface includes a first measurement region and a second measurement region arranged in a circumferential direction of the rotational axis relative to the first measurement region, and that passes an irradiation position where the measurement light is reflected by the outer surface, during a rotation of the rotating body. The first measurement region directs the reflected light in a first direction toward the optical sensor, and the second measurement region includes a marking to direct the reflected light in a second direction different from the first direction.