Composite Profile Measuring Device for Camshaft Evaluation
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Solution Overview
Problem
Existing methods struggle to accurately evaluate the composite profile of camshafts with variable phase differences between fixed and movable cams, requiring complex calculations and potentially decreasing accuracy due to errors between actual and calculated profiles.
Innovation Solution
A method and device that adjust and measure the relative positioning of fixed and movable cams using contact elements and displacement detection, allowing direct measurement of the composite profile by rotating the inner and outer shafts with integrated contact elements, eliminating the need for profile combination calculations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If contact elements are brought into contact separately with the fixed cam and the movable cam to evaluate respective profiles, then the individual profile accuracy can be assessed, but the actual composite profile cannot be evaluated
Solution Approach 1:
The patent combines the evaluation of fixed cam and movable cam into a single integrated measurement process. By positioning contact elements to simultaneously contact both cams and rotating the camshaft as a unified assembly, the invention directly measures the composite profile formed by the interaction of both cams, eliminating the need for separate evaluation processes and achieving accurate composite profile assessment.
Solution Approach 2:
The measurement device is designed to perform multiple functions: it can evaluate both the fixed cam profile and movable cam profile individually, while also measuring the composite profile formed by their combined action. This universal approach allows a single measurement system to address multiple evaluation requirements without requiring separate specialized devices for each function.
2Ease of manufacture
If the composite profile is obtained by calculating the respective profiles of the fixed cam and movable cam, then the evaluation process can be simplified, but errors occur between actual and calculated profiles
Solution Approach 1:
The patent replaces the computational/mathematical approach with a direct mechanical measurement approach. Instead of calculating the composite profile by processing individual cam profiles through complex computations, the invention uses contact elements that physically trace the composite profile geometry while the camshaft rotates, directly capturing the actual composite profile through mechanical means and eliminating calculation errors.
3Measurement precision
If contact elements are positioned to contact both fixed cam and movable cam simultaneously, then the composite profile can be directly measured, but the positioning and measurement system becomes more complex
Solution Approach 1:
The measurement system is divided into distinct functional components: contact elements positioned to engage with specific regions of the fixed cam and movable cam, a camshaft rotation mechanism, and a displacement detection system. This segmentation allows each component to be optimized independently while working together to achieve accurate composite profile measurement without requiring an overly complex integrated system.
Data Source
AI summary
A composite profile evaluating method includes an adjusting step and a composite profile detecting step. In the adjusting step, a relative position between a fixed cam and a movable cam is adjusted. In the composite profile detecting step, at least either one of a first contact element, which is displaced along a diametrical direction of the fixed cam upon contacting a cam surface of the fixed cam, and a second contact element, which is displaced integrally with the first contact element and along a diametrical direction of the movable cam upon contacting a cam surface of the movable cam, is brought into contact with the cam surface of the fixed cam or the movable cam. In such a state, the composite profile is obtained by rotating the fixed cam and the movable cam, and detecting the amounts of displacement of the first and second contact elements.