Hydraulic Nut Mounting With Feedback for Precise Interference Fit
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Solution Overview
Problem
The existing methods for mounting annular components, such as bearings, on conical shafts are prone to operator inaccuracy due to imprecise pressure and displacement measurements, and manual actuation, which can lead to overloading or underloading, causing issues like creep and stress corrosion.
Innovation Solution
A system utilizing a hydraulic nut with a wireless pressure sensor and displacement transmitter, controlled by a remote device that automatically adjusts pressure and displacement to achieve a precise interference fit, reducing operator reliance and improving accuracy and speed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If manual actuation and measurement methods are used, then operator flexibility is maintained, but mounting precision deteriorates due to operator inaccuracy and imprecise measurements
Solution Approach 1:
The patent replaces manual mechanical actuation and measurement systems with an automated hydraulic system equipped with sensors and electronic control. The manual hand pump is replaced by an automated hydraulic actuator controlled by a microprocessor, and manual gauge readings are replaced by electronic sensors that provide precise digital measurements of pressure and displacement, thereby improving measurement precision while accepting increased device complexity.
Solution Approach 2:
The patent implements feedback control by using sensors to continuously monitor pressure and displacement during the mounting process, comparing these measurements against target values stored in memory, and automatically adjusting the hydraulic actuation to achieve the desired interference fit. This closed-loop feedback system eliminates operator inaccuracy and ensures precise mounting parameters.
2Manufacturing precision
If automated control with sensors is implemented, then mounting accuracy improves, but device complexity increases
Solution Approach 1:
The patent replaces manual mechanical actuation and measurement systems with an automated hydraulic system equipped with sensors and electronic control. The manual hand pump is replaced by an automated hydraulic actuator controlled by a microprocessor, and manual gauge readings are replaced by electronic sensors that provide precise digital measurements of pressure and displacement, thereby improving measurement precision while accepting increased device complexity.
Solution Approach 2:
The system performs self-monitoring and self-adjustment through embedded sensors and microprocessor control. The sensors automatically detect pressure and displacement values, the microprocessor compares these against stored target values, and the system automatically adjusts the hydraulic actuation without requiring external operator intervention, achieving precise mounting through self-service automation.
3Reliability
If high internal stresses are applied to achieve interference fit, then mounting reliability improves, but risk of overloading and damage increases
Solution Approach 1:
The patent implements feedback control by using sensors to continuously monitor pressure and displacement during the mounting process, comparing these measurements against target values stored in memory, and automatically adjusting the hydraulic actuation to achieve the desired interference fit. This closed-loop feedback system eliminates operator inaccuracy and ensures precise mounting parameters.
Solution Approach 2:
The system stores target pressure and displacement values in memory before the mounting operation begins. These pre-programmed target values represent the optimal parameters for achieving reliable interference fit without overloading. The automated system follows these predetermined parameters, ensuring that the mounting process achieves reliable fixation while avoiding harmful overloading conditions.
4Object-affected harmful factors
If low internal stresses are applied, then risk of overloading decreases, but mounting reliability deteriorates due to fretting and stress corrosion
Solution Approach 1:
The patent implements feedback control by using sensors to continuously monitor pressure and displacement during the mounting process, comparing these measurements against target values stored in memory, and automatically adjusting the hydraulic actuation to achieve the desired interference fit. This closed-loop feedback system eliminates operator inaccuracy and ensures precise mounting parameters.
Solution Approach 2:
The system stores target pressure and displacement values in memory before the mounting operation begins. These pre-programmed target values represent the optimal parameters for achieving reliable interference fit without overloading. The automated system follows these predetermined parameters, ensuring that the mounting process achieves reliable fixation while avoiding harmful overloading conditions.
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 enables more accurate, faster, and reliable mounting of annular components by providing real-time feedback and automated control, minimizing the risk of overloading or underloading and enhancing the stability of the interference fit.
Implementation Method 1
A pump is connected to the hydraulic nut and is arranged to pump fluid into the hydraulic nut
Implementation Method 2
internal stresses are generated whereby an interference fit is obtained. The conical object is stretched, whereas the shaft is compressed
Data Source
AI summary
A system for mounting an annular component on a shaft, comprising (a) a hydraulic nut having an annular coaxial cavity and a ring-like piston, displaceable within the cavity; (b) a displacement sensor for providing a displacement signal indicating the axial displacement of the piston within the cavity; (c) a wireless displacement transmitter for transmitting the displacement signal; (d) a pressure sensor for providing a pressure signal indicating a pressure within the cavity; (e) a wireless pressure transmitter for transmitting the pressure signal; (f) a pump arranged to pump fluid into the cavity; and (g) a remote control device having a communications device arranged to receive transmitted pressure and displacement signals, wherein the remote control device is arranged to output control information for controlling the pump.