Gear Unit Lubrication Pump Torque Control via Oil Temperature
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Solution Overview
Problem
Gear units face a trade-off between cold start time and lubrication pump fault/wear risk due to fixed torque and speed limitations during cold start, leading to inefficient cold start processes.
Innovation Solution
A gear unit with a temperature sensor and electrical device that dynamically adjusts torque and speed limits of the lubrication pump based on oil temperature, using a motor controlled by a frequency converter to optimize pump operation and prevent mechanical faults.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If higher torque and speed limits are used during cold start, then the cold start process duration is reduced, but the fault risk and wear of the lubrication pump increase
Solution Approach 1:
The patent applies dynamics by making the torque limit and speed limit adjustable rather than fixed. The control device dynamically adapts the maximum allowable torque and speed based on monitored pump operating conditions, allowing the system to transition from conservative cold start limits to higher operational limits as the pump warms up, thereby resolving the contradiction between quick cold start and pump protection
Solution Approach 2:
The patent implements feedback by continuously monitoring the lubrication pump's operating parameters (temperature, current, power consumption) and using this information to dynamically adjust the torque and speed limits. This closed-loop control allows the system to optimize cold start duration while preventing pump damage by responding to real-time pump condition data
2Reliability
If a safety margin is applied when selecting torque and speed limits during cold start, then the fault risk and wear of the lubrication pump are reduced, but the cold start process duration becomes unsatisfactorily long
Solution Approach 1:
The system transitions from static safety margins to dynamic operating limits. Instead of applying a fixed safety margin that restricts performance, the control device dynamically determines appropriate limits based on actual pump conditions, allowing the system to achieve both reliability and productivity by adapting limits in real-time
Solution Approach 2:
The patent changes the operating parameters (torque limit, speed limit) based on monitored pump conditions such as temperature and power consumption. This allows the system to optimize the balance between safety and efficiency by adjusting parameters dynamically rather than maintaining fixed conservative limits throughout the cold start process
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
This approach reduces the duration of the cold start process while minimizing the risk of mechanical faults and wear, by allowing increased torque and speed as the oil warms up, thus avoiding unnecessarily strict limitations.
Implementation Method 1
a temperature sensor for measuring temperature of the lubricating oil and supplying a temperature signal representative thereof
Implementation Method 2
an electrical motor for driving the lubrication pump, and an electrical device for energizing and controlling the electrical motor
Implementation Method 3
a lubrication pump for circulating lubricating oil through the at least one gear stage and bearings of the gear unit
Data Source
AI summary
A gear unit includes shafts for connecting to an external mechanical system, at least one gear stage between the shafts, a lubrication pump for circulating lubricating oil through the at least one gear stage and bearings of the gear unit, a temperature sensor for measuring temperature of the lubricating oil and supplying a temperature signal, an electrical motor for driving the lubrication pump, and an electrical device for controlling the electrical motor so that torque directed to the lubrication pump is below a torque limit. The torque limit is determined dynamically on the basis of the measured temperature of the lubricating oil. This arrangement makes it possible to protect the lubrication pump against mechanical faults during a cold start process so that an unnecessarily strict torque limitation, which would slow down the cold start process, can be avoided.