Hydraulic Pump Unit With Immersed Solenoid Valve for Low Pressure Loss
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Solution Overview
Problem
Existing pump units for motor vehicle drive trains face challenges in protecting solenoid valves from environmental influences and corrosion, while also achieving efficient heat transfer and low dynamic pressure loss.
Innovation Solution
The solenoid valve is positioned within the storage container filled with hydraulic fluid, allowing for protection against corrosion and efficient cooling, with a coil surrounded by a housing and an armature bearing gap filled with hydraulic fluid, ensuring continuous fluid flow and precise pressure control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the solenoid valve is positioned outside the storage container, then it is easier to access and maintain, but it is exposed to environmental influences and corrosion
Solution Approach 1:
The solenoid valve is nested within the storage container, with the valve body positioned inside the container and surrounded by hydraulic fluid. This nesting arrangement protects the solenoid valve from environmental influences and corrosion while maintaining a compact overall structure.
2Loss of energy
If the solenoid valve is positioned away from the storage container, then it is easier to install and replace, but the paths for hydraulic fluid are longer causing higher dynamic pressure loss
Solution Approach 1:
The solenoid valve is merged with the storage container by positioning it inside the container and integrating it with the pump housing. This combination eliminates separate mounting structures and minimizes the paths for hydraulic fluid between the valve and storage container, reducing dynamic pressure loss.
3Temperature
If the solenoid valve is surrounded by air, then it operates in a simple environment, but heat transfer efficiency is poor
Solution Approach 1:
The solenoid valve is surrounded by hydraulic fluid instead of air, utilizing the hydraulic medium to enhance heat transfer efficiency. The hydraulic fluid acts as a thermal conductor, effectively transferring heat from the solenoid valve to the storage container and surrounding structures.
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 configuration provides enhanced protection against corrosion, efficient heat transfer, and precise hydraulic pressure control, resulting in improved reaction times and reduced dynamic pressure loss, leading to a compact and reliable pump unit design.
Implementation Method 1
the solenoid valve can be cooled by the hydraulic fluid
Implementation Method 2
In the event of a cold start, the solenoid valve can be used to heat the hydraulic fluid
Implementation Method 3
the bearing gap is filled with hydraulic fluid. By the armature also being washed around by hydraulic fluid, foreseeable damping properties arise at all times
Data Source
AI summary
A pump unit provides a hydraulic pressure for actuating an actuator in the drive train of a motor vehicle, in particular a clutch actuator or gearbox actuator. The pump unit includes a pump, a storage container for hydraulic fluid, and at least one solenoid valve. The solenoid valve is arranged within the storage container such that it is surrounded by hydraulic fluid.