Crankpin In-Process Measuring Device Linkage Kinematics

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Solution Overview

Problem

Existing in-process measuring devices for machining operations, such as grinding machines, are complex, space-consuming, and lack efficient kinematics for secure contact with rotating crankpins without risking damage from the grinding wheel.

Innovation Solution

A measuring device with a linkage system featuring pivotable elements and a holding arm, allowing the measuring head to securely pivot into contact with the crankpin while avoiding the grinding wheel, and replicating its movements for accurate measurement, utilizing a combination of pivot axes and a linearly deflectable probe for precise measurements.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If a measuring device is integrated into a grinding machine for in-process measurement, then measurement capability is improved, but device complexity and space requirements increase

Engineering Contradiction:

Improvein-process measurement capabilityVSAvoidconstruction complexity

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

The measuring device is integrated into the grinding machine structure, combining measurement and machining functions in one system. The measuring head is mounted on the grinding machine's radial movement mechanism, allowing synchronized movement with the grinding wheel while maintaining measurement capability throughout the grinding process.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The measuring head serves multiple functions: it measures crankpin diameter, monitors roundness, and tracks positional deviations during grinding. The same measuring head can be used for different measurement tasks by adjusting its orientation and contact point, reducing the need for multiple specialized devices.

Inventive Principle:

Principle #6Universality (Multi-functionality)

2Measurement precision

If the measuring head is positioned close to the grinding wheel for accurate measurement, then measurement accuracy is improved, but the risk of damage from the grinding wheel increases

Engineering Contradiction:

Improvemeasurement accuracyVSAvoidgrinding wheel damage risk

Core Design Contradiction:

Measurement precisionVSObject-affected harmful factors

Solution Approach 1:

The measuring head is positioned to approach the crankpin from a direction and distance that allows measurement before the grinding wheel contacts the crankpin. The control system uses preliminary measurement data to adjust grinding parameters, preventing the need for the measuring head to be in the direct path of the grinding wheel.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The control system acts as an intermediary between the measuring head and grinding wheel, using measurement data to mediate the grinding process. The measuring head provides feedback about crankpin dimensions, and the control system adjusts grinding wheel position and pressure accordingly, preventing harmful interactions while maintaining measurement accuracy.

Inventive Principle:

Principle #24Intermediary (Mediator)

3Stability of the object's composition

If the measuring head securely contacts the crankpin for stable measurement, then measurement stability is improved, but the risk of interfering with crankpin rotation and grinding increases

Engineering Contradiction:

Improvemeasurement stabilityVSAvoidinterference with rotation

Core Design Contradiction:

Stability of the object's compositionVSObject-generated harmful factors

Solution Approach 1:

The measuring head contacts the crankpin at a specific local point rather than across the entire surface. This localized contact provides stable measurement of diameter and roundness while minimizing interference with the overall rotation and grinding process. The contact point is strategically positioned to avoid critical rotation zones.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The measuring head is designed with dynamic adjustment capabilities, allowing it to adapt its contact force and position during the measurement and grinding process. The measuring head can dynamically adjust its radial position to maintain optimal contact with the rotating crankpin, ensuring measurement stability while accommodating rotation and grinding movements.

Inventive Principle:

Principle #15Dynamics

4Reliability

If a robust linkage system is used to pivot the measuring head, then reliability is improved, but device complexity and space requirements increase

Engineering Contradiction:

Improvemeasurement reliabilityVSAvoidspace requirements

Core Design Contradiction:

ReliabilityVSVolume of moving object

Solution Approach 1:

The linkage system components are nested within each other when not in use. The measuring head can be retracted into the grinding machine structure, with the linkage elements folding or nesting together to minimize space occupation. This allows a robust linkage system to be integrated without excessive space requirements.

Inventive Principle:

Principle #7Nested doll (Nesting)

Data Source

PatentEP2298497B1In-process measuring device for the grinding of crankpins

Publication Date: 2013.03.06 JENOPTIK IND METROLOGY GERMANY

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AI summary

The measuring device comprises a measuring head (12), which is connected with a base body (18) of the measuring device by a linkage (14) swiveling around a rotation axis, and has a measuring prism (38). The linkage has two linkage elements (20,22), which are arranged swiveling around another rotation axis (16).