Gerotor Pump Pressure Equalization for Axial Force Reduction
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Solution Overview
Problem
Highly integrated gerotor pumps with structurally combined electrical and pump rotors experience axial forces leading to mechanical friction, leakage, and pressure peaks, necessitating overdimensioned components and increased installation space and production costs due to inefficient pressure compensation.
Innovation Solution
A gerotor pump design with a device for partial pressure compensation between the suction region and motor compartment, utilizing a cavity in the shaft with connections to the motor compartment and suction region, which builds pressure to reduce axial bearing load, minimize leakage, and enhance sealing, while also dissipating heat losses and improving lubrication and cooling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If axial bearing is used to accommodate axial forces in highly integrated gerotor pump, then rotor positioning is achieved, but mechanical friction increases and leakage occurs in the gap between rotor and side plate
Solution Approach 1:
The patent introduces a pressure compensation device that utilizes hydraulic pressure from the pump's pressure region to counterbalance axial forces on the rotor. This hydraulic support mechanism replaces or supplements the axial bearing, reducing mechanical contact and friction while maintaining rotor positioning stability.
Solution Approach 2:
The patent changes the pressure parameter in the motor compartment by introducing a connection to the pump's pressure region. This pressure compensation creates a force balance that reduces axial loading on the bearing, thereby decreasing friction and energy loss.
2Stability of the object's composition
If axial bearing is used to accommodate axial forces, then rotor positioning is achieved, but gap between rotor and side plate increases causing leakage
Solution Approach 1:
The pressure compensation device uses hydraulic pressure to push the rotor toward the side plate, maintaining optimal gap clearance. This eliminates excessive gaps that would cause leakage while preserving stable rotor positioning through pressure-based force balance.
Solution Approach 2:
By introducing pressure compensation, the axial position of the rotor is dynamically adjusted through pressure forces, maintaining the gap within optimal ranges to prevent leakage while ensuring stable positioning.
3Stability of the object's composition
If pressure peaks are accommodated in transmission, then system stability is maintained, but components must be overdimensioned increasing installation space and production costs
Solution Approach 1:
The pressure compensation device creates a controlled pressure balance between the motor compartment and pump chamber, preventing pressure peaks from transmitting to the bearing and housing structures. This allows components to be sized for normal operating conditions rather than peak pressures, reducing overdimensioning.
Solution Approach 2:
The pressure compensation device preemptively counteracts pressure peaks by maintaining a balanced pressure distribution, preventing the transmission of harmful pressure spikes to other components before they can cause damage or require overdimensioning.
4Stress or pressure
If two side plates with pressure compensation are used, then pressure difference is optimized, but bearing region between hydraulic pump rotor and electrical rotor increases installation space
Solution Approach 1:
The patent merges the motor compartment with the pressure compensation function by introducing a connection between the motor compartment and the pump's pressure region. This eliminates the need for a separate second side plate with pressure compensation, as the motor compartment itself serves as the pressure compensation chamber, reducing installation space.
Solution Approach 2:
The motor compartment is given multiple functions: housing the electrical motor and serving as the pressure compensation chamber. This multi-functionality eliminates the need for separate pressure compensation structures, reducing overall device complexity and installation space while maintaining optimized pressure difference.
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 effectively reduces axial forces and leakage, improves sealing, and relieves pressure peaks, leading to more accurate pressure sensors and reduced component loads, while also enhancing heat dissipation and lubrication, thus optimizing the pressure difference between the motor compartment and pressure region.
Implementation Method 1
axial forces arise which are accommodated by an axial bearing
Implementation Method 2
at least a partial pressure compensation takes place between the suction region of the gerotor pump and the motor compartment of the gerotor pump
Implementation Method 3
the gap between rotor and flange is compressed, whereby leakage decreases
Implementation Method 4
the inflow to said compartment is caused by the leakage in said gap itself
Implementation Method 5
heat losses of electric motor and electronics are dissipated by the flow that is generated
Data Source
AI summary
A gerotor pump having an inner rotor and an outer rotor, which is also the rotor of an electric drive, having a housing and a flange which closes the housing with the motor compartment, the rotor being arranged on a shaft and sealing against the flange at a gap, wherein, in addition to the gap, there is at least one device with which at least a partial pressure compensation takes place between the suction region of the gerotor pump and the motor compartment of the gerotor pump.