Motor-Pump Housing Cooling for Continuous High-Pressure Operation
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Solution Overview
Problem
Existing hydraulic motor pump units suffer from poor heat dissipation, making them unsuitable for continuous operation under high pressure, particularly in applications like active roll stabilization systems, and require precise machining for tight tolerances, increasing manufacturing costs.
Innovation Solution
A hydraulic motor pump unit with a compact configuration integrating a crescent gear pump and electric drive, featuring a housing with fin patterns for air cooling and a cooling path using hydraulic fluid to dissipate heat, along with a thrust bearing mechanism to maintain operational stability and efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of moving object
If known hydraulic motor pump units are used for continuous operation under high pressure, then they can provide hydraulic power, but they overheat and have poor heat dissipation
Solution Approach 1:
The patent converts the harmful heat generated during high-pressure operation into a beneficial cooling mechanism by directing hydraulic fluid through cooling channels in the housing and end caps. The hydraulic fluid absorbs heat from the motor coils and pump components, transforming the thermal problem into an integrated cooling system that enables continuous operation without overheating.
2Manufacturing precision
If tight tolerances are required for precise machining, then pump effectiveness is improved, but manufacturing complexity and costs increase
Solution Approach 1:
The patent modifies the geometric parameters of the crescent gear pump components, specifically the tooth profiles and clearances, to optimize pump effectiveness. By carefully selecting and adjusting these dimensional parameters, the design achieves high pumping efficiency while maintaining manufacturability, balancing precision requirements with manufacturing complexity.
3Volume of moving object
If a compact structure is implemented, then installation space is reduced, but heat dissipation capability may be compromised
Solution Approach 1:
The patent integrates the cooling channels directly into the housing and end cap structures, nesting the thermal management system within the existing mechanical components. This nested approach allows heat dissipation functionality to be incorporated without increasing the overall volume, maintaining compact installation space while effectively managing thermal loads during continuous operation.
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 solution enables continuous operation for at least 10 minutes under 150 bar pressure with a flow rate of 20 liters/minute, maintaining efficiency and preventing overheating, while reducing manufacturing complexity and costs.
Implementation Method 1
a fin pattern (45) for an air cooling of the housing to an environment
Implementation Method 2
a cooling path using hydraulic fluid to dissipate heat
Data Source
AI summary
A hydraulic motor pump unit for pressurising a hydraulic fluid in a hydraulic circuit. The motor pump unit includes a motor having a motor stator holding a circular array of coils and a motor rotor having a motor rotor body having an outer circumferential rotor surface holding a circular array of magnets. The motor rotor body is positioned within the motor stator holding the magnets opposite the coils. A pump is drivable connected to the motor rotor. A housing body provided with a pump chamber for housing the pump and a cylindrically shaped coil support for supporting the circular array of coils. The housing comprises at least one housing end cap which is connected to the coil support which housing end cap is provided with a fin pattern for an air cooling of the housing to an environment.