Vane Cell Pump With Gerotor Preload for Dry Sump Lubrication
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Solution Overview
Problem
Conventional dry-sump lubrication systems require multiple oil pumps and face inefficiencies during startup due to vanes not initially resting on the stroke ring in vane cell pumps, leading to reduced efficiency and increased installation height.
Innovation Solution
A cooling lubrication system with a double-flow vane cell pump and a gerotor pump on a common shaft, where the gerotor pump preloads the vane cell pump with pressure and supplies oil to under-vane grooves, eliminating the need for additional delivery devices and optimizing oil circulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional dry-sump lubrication system uses multiple oil pumps, then the oil circulation is maintained, but the device complexity and installation height increase
Solution Approach 1:
The patent combines multiple pump functions into a single vane cell pump by integrating a gerotor pump as the drive mechanism for the vanes. This single integrated pump unit performs both the oil delivery function and the vane retraction function, eliminating the need for separate pumps and reducing overall system complexity while maintaining reliable oil circulation.
Solution Approach 2:
The vane cell pump is designed with multi-functionality where the gerotor pump serves dual purposes: it acts as the main oil delivery pump and simultaneously provides pressure to retract the vanes against the stroke ring. This universal design allows one component to fulfill multiple functions that traditionally required separate components.
2Reliability
If all under-vane grooves are subjected to high pressure, then the vanes remain in contact with the stroke ring, but the energy consumption and system complexity increase
Solution Approach 1:
The patent applies local quality by differentiating the pressure application in under-vane grooves based on their location. Only the under-vane grooves in the pressure area are connected to the high-pressure oil supply from the gerotor pump, while those in the suction area are not subjected to high pressure. This localized pressure application maintains vane contact where needed without the energy cost of system-wide high pressure.
Solution Approach 2:
The system uses the oil pressure naturally generated in the pressure area of the vane cell pump to retract the vanes, rather than requiring an external high-pressure supply. The vanes are retracted by the local oil pressure that already exists in the system, making the system self-sufficient and avoiding additional energy consumption.
3Stability of the object's composition
If the engine is mounted deeper in vehicles to reduce center of gravity, then driving stability improves, but the installation space for oil components becomes limited
Solution Approach 1:
The patent merges the oil delivery pump and the vane retraction mechanism into a single integrated vane cell pump unit. This consolidation reduces the overall volume and installation space required for oil components, allowing the engine to be mounted deeper in the vehicle for improved stability without compromising component accommodation.
Solution Approach 2:
The gerotor pump is nested within the vane cell pump structure, with the gerotor pump serving as the drive mechanism for the vanes. This nested configuration maximizes space utilization and minimizes the external dimensions of the oil pump assembly, enabling compact installation in vehicles with reduced center of gravity.
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 reduces the number of oil pumps needed, enhances efficiency by ensuring continuous oil supply, and allows for a more compact design, decreasing the vehicle's center of gravity and improving engine cooling.
Implementation Method 1
the gerotor pump is connected on the pressure outlet side to under-vane grooves in the vane cell pump
Implementation Method 2
a rotor driven by a drive shaft, which is rotatably disposed inside a stroke ring between two end plates and in the circumferential surface of which are provided essentially radially extending slots, in which vanes are arranged in a radially displaceable manner
Implementation Method 3
the engine is better cooled since larger quantities of oil are in circulation
Data Source
AI summary
A cooling lubrication system comprises a dry sump, an oil tank, and a pump system that operates an oil circuit in which an oil pump delivers oil from the dry sump into the oil tank, and the pump system comprises a vane cell pump and a gerotor pump on a shaft.