Camshaft Positioning Device Angular Sensor Integration

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Solution Overview

Problem

The existing methods for angular positioning of a camshaft relative to a cylinder head in internal combustion engines are inefficient, prone to errors, and result in increased pollution, decreased engine performance, and material waste due to the complexity and potential for incorrect positioning, especially when dealing with slight variations in engine components and surface roughness.

Innovation Solution

A device comprising a wedge with a rider and an angular sensor is used for quick and accurate angular positioning of the camshaft, allowing for calibration, measurement, and adjustment, enabling correction of positioning tolerances and identifying defects, thereby simplifying the process and reducing assembly time.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If traditional measurement methods with multiple supports and measuring tools are used, then positioning accuracy can be achieved, but the process becomes long and tedious

Engineering Contradiction:

Improvecamshaft positioning accuracyVSAvoidassembly time

Core Design Contradiction:

Measurement precisionVSLoss of time

Solution Approach 1:

The patent replaces traditional mechanical measurement tools and manual measurement procedures with an angular sensor that provides electronic angular position detection. This substitution eliminates the need for multiple measuring tools and manual measurements, significantly reducing assembly time while maintaining positioning accuracy.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent changes the measurement parameter from mechanical dimensions and manual measurements to electronic angular position detection. By using an angular sensor to detect the camshaft's angular position relative to the cylinder head, the system transforms the measurement process into a faster, more efficient electronic detection method.

Inventive Principle:

Principle #35Parameter changes

2Measurement precision

If multiple supports and measuring tools are mounted on the cylinder head, then measurement accuracy improves, but the complexity and number of components increases

Engineering Contradiction:

Improvemeasurement accuracyVSAvoidnumber of supports and tools

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

The patent extracts the essential measurement function from the complex system of multiple supports and measuring tools, concentrating it into a single angular sensor. This extraction eliminates unnecessary components while retaining the core measurement capability, significantly reducing device complexity.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The angular sensor serves multiple functions: it detects angular position, provides positioning data, and enables verification of camshaft alignment. This multi-functionality replaces the need for multiple specialized measuring tools and supports, simplifying the overall system.

Inventive Principle:

Principle #6Universality (Multi-functionality)

3Reliability

If flat surfaces are used for positioning, then positioning reliability improves, but sensitivity to surface roughness increases

Engineering Contradiction:

Improvepositioning reliabilityVSAvoidsurface roughness sensitivity

Core Design Contradiction:

ReliabilityVSManufacturing precision

Solution Approach 1:

The patent replaces mechanical flat surface contact with electronic angular sensing. Instead of relying on physical contact between flat surfaces, the angular sensor detects angular position through a non-contact or minimally contact method, eliminating the problem of surface roughness affecting positioning reliability.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

4Difficulty of detecting and measuring

If visual inspection is used to detect positioning faults, then defect detection is possible, but the process is time-consuming and less precise

Engineering Contradiction:

Improvedefect detection capabilityVSAvoidinspection time

Core Design Contradiction:

Difficulty of detecting and measuringVSLoss of time

Solution Approach 1:

The patent replaces visual inspection with electronic angular measurement. The angular sensor provides precise, objective measurement of camshaft positioning that can be read directly, eliminating the need for time-consuming visual inspection and improving both precision and speed of defect detection.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Data Source

PatentEP3152415B1Positioning device for a camshaft

Publication Date: 2018.07.04 PSA AUTOMOBILES SA

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AI summary

The invention relates to a device (1) for angular positioning of a camshaft relative to a cylinder head of an internal combustion engine, said device (1) comprising a shim (5) having a jumper (6) comprising a body (7) and two parallel legs (8) which project from the body (7) and are capable of coming into contact with at least one flattened section made on the camshaft such that the shim (5) straddles the camshaft, the shim (5) also comprising an arm (10) projecting from the body (7), opposite the legs (8), said arm having an outer surface (11) and an inner surface, opposite one another, the device (1) also comprising an angular sensor (13) capable of being mounted on the inner surface or the outer surface (11).