Oscillation Damping Element for Crank Pin Measuring Head
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Solution Overview
Problem
Existing roundness and dimension measuring devices for crank pins during machining operations on grinding machines experience high wear due to the measuring head being held in engagement solely by the force of gravity, leading to excessive measuring forces and increased wear on both the device and workpiece.
Innovation Solution
Incorporating an oscillation damping element, such as a hydraulic piston and cylinder configuration, to assist in holding the measuring head in engagement with the crank pin during orbital rotations, allowing for a balanced dynamic force that reduces measuring force and wear by opposing upward and downward movements differently, thus minimizing wear and improving measuring accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the measuring head is held in engagement with the crank pin solely by the force of gravity, then the device structure is simple, but the measuring force becomes excessively large during upward movement causing high wear
Solution Approach 1:
The patent introduces an oscillation damping element that generates a counteracting force to balance the weight force of the measuring head during orbital rotation. This counterweight mechanism prevents the excessive measuring force that occurs when gravity alone holds the measuring head in engagement, thereby reducing wear on both the measuring device and workpiece while maintaining a relatively simple device structure.
Solution Approach 2:
The oscillation damping element dynamically adjusts the measuring force parameters during orbital rotation by providing variable damping forces. This parameter change allows the system to compensate for the varying gravitational effects during different phases of orbital motion, optimizing the measuring force to minimize wear while maintaining measurement accuracy.
2Measurement precision
If the measuring head follows orbital rotations of the crank pin, then measurement accuracy is improved, but measuring force increases due to dynamic effects
Solution Approach 1:
The patent employs a dynamic oscillation damping element that adapts its damping characteristics during the orbital rotation of the measuring head. This dynamic adjustment allows the system to maintain accurate measurement of crank pin roundness and dimensions while compensating for the increased measuring forces generated by orbital motion, thereby achieving both measurement precision and force reduction.
3Reliability
If a tactile measuring probe is used to ensure proper engagement, then measurement reliability is improved, but the required measuring force increases causing excessive wear
Solution Approach 1:
The oscillation damping element acts as a counterweight mechanism that balances the gravitational force on the tactile measuring probe during orbital rotation. This ensures reliable engagement of the probe with the crank pin surface for accurate measurement while preventing excessive measuring force that would cause wear, thus maintaining both reliability and reducing harmful wear effects.
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 oscillation damping element reduces wear on the measuring device and workpiece while maintaining sufficient engagement force, enhances measuring accuracy by reducing resonance-induced errors, and utilizes cost-effective standard components, effectively addressing the limitations of prior art.
Implementation Method 1
at least one oscillation damping element is operatively associated with the measuring head for holding the measuring head in engagement with the crank pin during the orbital rotation
Implementation Method 2
a hydraulic piston and cylinder configuration to assist in holding the measuring head in engagement with the crank pin during orbital rotations
Implementation Method 3
the measuring head in the measuring position follows orbital rotations of the crank pin
Implementation Method 4
the measuring head is held in engagement with the crank pin to be measured, solely by the force of gravity
Data Source
AI summary
A roundness and/or dimension measuring device for in-process measurement of crank pins during a machining operation on a grinding machine having a base body, and a measuring head, which is connected to the base body via a rod assembly and which is movable between a neutral position and a measuring position. The measuring head has a measuring probe for contacting the crank pin, and the rod assembly is designed and configured in such a way that the measuring head in the measuring position follows orbital rotations of the crank pin. At least one oscillation damping element is operatively associated with the measuring head for holding it in engagement with the crank pin during the orbital rotation.