Gerotor Pump Axial Gap Compensation via Pretensioned Plate
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Solution Overview
Problem
Conventional gerotor pumps suffer from internal leakage due to axial gaps caused by production tolerances, leading to decreased efficiency and increased wear, especially at lower temperatures and higher viscosity fluids.
Innovation Solution
The gerotor pump incorporates pretensioned compensation plates axially spaced from the rotors in the idle state, reducing friction and wear, and features pressure compensation grooves and seals to minimize axial gaps and enhance efficiency across pressure ranges.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional compensation plates are used to compensate for axial gaps, then the axial gap is reduced, but the rotors are braked when the pump is started up and wear increases
Solution Approach 1:
The compensation plate is designed to dynamically change its position relative to the rotors based on operating conditions. In the idle state, it is spaced apart by a predetermined distance to avoid contact and braking. During operation, hydraulic pressure causes the compensation plate to move closer to compensate for axial gaps, thus resolving the contradiction between gap compensation and avoiding wear/braking.
2Manufacturing precision
If the compensation plate is in contact with rotors in idle state, then axial gap is compensated, but the starting torque and power requirements increase
Solution Approach 1:
The compensation plate is pre-positioned at a predetermined distance from the rotors in the idle state through spacing elements or design features. This preliminary positioning prevents contact and reduces starting torque requirements. The compensation action is activated only when hydraulic pressure builds up during operation, thus resolving the contradiction between pre-compensation and starting power.
3Loss of energy
If axial gap is compensated at lower temperatures, then leakage is reduced, but the degree of efficiency decreases due to higher fluid viscosity
Solution Approach 1:
The compensation mechanism utilizes changes in hydraulic pressure (a physical parameter) to adjust the position of the compensation plate. As fluid pressure increases during operation, the compensation plate moves to reduce axial gaps. This dynamic parameter-based adjustment allows the system to adapt to varying operating conditions including temperature and viscosity changes, resolving the contradiction between leakage compensation and efficiency maintenance.
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 axial gaps, decreases wear, and improves efficiency even at low pressures and high viscosity conditions, while also reducing the starting torque and power requirements.
Implementation Method 1
the at least one compensation plate is axially pretensioned by a resilient element with respect to the outer rotor and the inner rotor
Implementation Method 2
As a result of the changing volumes between the tooth gaps between the inner rotor and outer rotor, pressure regions are formed, also referred to as pump chambers, by means of which the fluid is conveyed
Data Source
AI summary
A gerotor pump for conveying a fluid from an inlet pump chamber which is connected to an inlet to an outlet pump chamber, which is connected to an outlet, of the gerotor pump having a rotatable outer rotor; a rotatable inner rotor, which is arranged radially inside the outer rotor; a housing having a housing cover and a housing base, between which the outer rotor and the inner rotor are arranged; and at least one compensation plate which is arranged in each case axially between the outer rotor and inner rotor and the housing cover or the housing base, wherein the at least one compensation plate in the idle state of the gerotor pump is axially spaced apart from the outer rotor and the inner rotor by pretensioning.