Drive-Drive Gear Pump Gap Control for Tooth Wear Reduction
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Solution Overview
Problem
Conventional drive-drive gear pumps face inefficiencies and premature wear due to variations in gear tooth dimensions and operating conditions, leading to inconsistent contact forces that affect performance and longevity.
Innovation Solution
A control system dynamically synchronizes torque and position between meshing gear teeth based on feedback signals, adjusting motor demands to maintain predetermined torque and gap width, addressing variations in fluid pressure, temperature, and manufacturing tolerances.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If drive-drive gear pumps operate with fixed motor speed demands, then the system structure is simple, but gear tooth wear increases and efficiency decreases due to variations in contact force
Solution Approach 1:
The control system continuously monitors the actual speeds of both gears and compares them to reference speeds, then adjusts motor speed demands based on the deviations detected. This feedback mechanism ensures consistent gear tooth contact force by dynamically adapting motor speeds to compensate for variations in operating conditions, thereby reducing wear and improving reliability.
Solution Approach 2:
The system transitions from fixed motor speed demands to dynamic speed adjustment. The control system continuously adapts the speed demands of both motors based on real-time operating conditions, ensuring optimal gear tooth contact force across varying pressures, temperatures, and flow rates, which prevents premature wear and maintains efficiency.
2Reliability
If gear tolerances are designed for worst-case stresses, then reliability under high pressure/temperature is improved, but pump efficiency decreases at normal operating conditions
Solution Approach 1:
The control system dynamically adjusts motor speed demands based on actual operating conditions. During normal operation, the system optimizes speeds for peak efficiency. When worst-case conditions occur (high pressure, high temperature), the system automatically adapts to maintain reliable gear tooth contact, eliminating the need to design for worst-case tolerances across all operating conditions.
Solution Approach 2:
The system changes operating parameters (motor speeds) dynamically based on conditions. By adjusting speed demands in response to pressure, temperature, and flow variations, the system maintains optimal gear tooth contact force across the full operating range, achieving both high efficiency at normal conditions and reliability at worst-case conditions.
3Productivity
If gear tolerances are set for optimal contact force at normal conditions, then efficiency is improved, but contact force becomes insufficient during worst-case scenarios
Solution Approach 1:
The control system continuously adapts motor speed demands to maintain optimal gear tooth contact force regardless of operating conditions. At normal conditions, the system achieves peak efficiency by optimizing speeds. When worst-case conditions occur, the system dynamically increases contact force by adjusting speed demands, ensuring reliable operation without sacrificing normal-condition efficiency.
4Reliability
If manufacturing tolerances for gear teeth are tight, then variation in contact force is reduced, but manufacturing cost increases
Solution Approach 1:
The control system uses feedback to compensate for manufacturing variations in gear teeth. By continuously monitoring gear speeds and adjusting motor speed demands, the system maintains consistent contact force even with standard manufacturing tolerances, eliminating the need for expensive tight tolerances while achieving reliable contact force consistency.
Solution Approach 2:
The control system automatically compensates for gear tooth dimensional variations through dynamic speed adjustment. The system self-regulates to maintain optimal contact force without requiring precision manufacturing, allowing standard manufacturing processes to be used while achieving consistent performance.
Data Source
AI summary
An apparatus includes a position adjustment circuit to receive a gap setpoint and a gap feedback signal corresponding to a gap width between a pair of meshing gear teeth of a first gear and a second gear. The position adjustment circuit outputs a gap adjustment signal corresponding to a difference between the gap setpoint and the gap feedback signal. The apparatus includes a motion control circuit to provide a first speed demand signal to the first motor that drives the first gear and a second demand signal to the second motor that drives the second gear, and dynamically synchronize position between the pair of meshing gear teeth such that the gap width between the pair of meshing gear teeth is within a predetermined range of the gap setpoint by adjusting at least one of the first speed demand signal or the second speed demand signal.