Gear Wheel Tooth Profile With Cutting Edge for Pump Running-In
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Solution Overview
Problem
Geared rotary positive displacement pumps experience plastic deformation and material spreading during the running-in phase due to the interaction between gear wheels and the pump body, leading to unpredictable wear and potential damage, especially when the gear wheels are made of harder materials than the pump body.
Innovation Solution
A gear wheel design with teeth featuring a cutting edge, defined by a groove that removes material from the pump body during rotation, minimizing plastic deformation and material spreading by expelling chips with the pumped fluid.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If gear wheels are made of harder material than the pump body, then the gear wheels can withstand higher loads and pressures, but plastic deformation and material spreading occur on the pump body during the running-in phase
Solution Approach 1:
The patent applies preliminary action by designing the gear wheel tooth profile in advance to account for elastic yieldings and radial positioning changes that occur during operation. The profile is pre-calculated and pre-formed to compensate for these deformations, ensuring that the gear wheel maintains correct interaction with the pump body even after running-in phase deformations occur.
Solution Approach 2:
The patent applies parameter changes by modifying the tooth profile parameters based on operating conditions. The profile is designed considering the elastic yieldings proportional to operating pressure and wheel length, and the parameters are adjusted to maintain proper meshing and clearance after the pump body undergoes plastic deformation during running-in.
2Stability of the object's composition
If the gear wheel teeth have a rounded top profile, then continuous contact between meshing wheels is achieved with no fluid encapsulation, but mechanical interference and excessive friction occur during the running-in phase
Solution Approach 1:
The patent applies parameter changes by modifying the tooth profile geometry to optimize the balance between continuous contact stability and friction reduction. The profile parameters are adjusted based on operating pressure and wheel dimensions to reduce mechanical interference during running-in while maintaining the continuous contact characteristic.
Solution Approach 2:
The patent applies dynamics by considering the dynamic behavior of the gear wheel during running-in, including elastic yieldings and radial positioning changes. The profile is designed to adapt to these dynamic changes, reducing excessive friction and heat generation while maintaining stable continuous contact during operation.
3Force
If the gear wheels create their own seat in the pump body during running-in, then the gear wheels can operate under load, but unpredictable wear and potential damage occur
Solution Approach 1:
The patent applies preliminary action by pre-calculating and pre-compensating for the seat creation that occurs during running-in. The tooth profile is designed in advance to account for the elastic yieldings and radial positioning changes, making the wear process predictable and controlled rather than unpredictable and harmful.
Solution Approach 2:
The patent applies feedback by incorporating the effects of running-in deformations into the profile design. The profile parameters are adjusted based on the expected elastic yieldings and radial positioning changes, creating a feedback loop where the design anticipates and compensates for the wear that occurs during 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 cutting edge configuration effectively reduces material spreading and deformation, ensuring a stable running-in phase, maintaining noiselessness and volumetric efficiency while preventing irreversible damage to the pump body, and enhancing the overall reliability and durability of the hydraulic apparatus.
Implementation Method 1
at least one tooth is shaped so as to have at least one cutting edge configured to remove material, in particular chip material, from a body (for example a casing) which is contacted by said cutting edge during the rotation of the gear wheel
Data Source
AI summary
A gear wheel (10) for a hydraulic apparatus is rotatable about an axis of rotation (H-H) and comprises a plurality of teeth (11) having a sectional profile (P) and being adapted to mesh with respective teeth of another gear wheel during a rotational motion about the axis of rotation (H-H), wherein at least one tooth (11) is shaped so as to have at least one cutting edge (12) configured to remove material, in particular chips, from a body which is contacted by the cutting edge during the rotation of the gear wheel (10), wherein the cutting edge (12) is defined by at least one groove (14) which is lowered by amount from 0.2% to 5% of the height (H′) of the tooth (11), said the groove (14) decreasing away from the cutting edge (12) along the profile (P).