Scavenge Gear Assembly Torque Oscillation Reduction
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Solution Overview
Problem
Current gear assemblies in oil pumps experience pressure pulses, horsepower loss, torque oscillation, noise, vibration, and harshness, along with increased scavenge backpressure, which affect the efficiency and performance of the pumps.
Innovation Solution
A scavenge gear assembly with a drive shaft and a slave drive shaft in parallel, featuring pairs of meshing gears with specific tooth spacing and keyway alignment to optimize torque transmission and reduce pulsations, noise, and backpressure, utilizing a dividing plate and end plates for gear separation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If conventional gear assemblies are used in oil pumps, then torque transmission is achieved, but pressure pulses, horsepower loss, and torque oscillation occur
Solution Approach 1:
The gear assembly is segmented into multiple gear sets (first gear set with first drive gear and first slave gear, second gear set with second drive gear and second slave gear) arranged in parallel. This segmentation allows the pressure pulses and torque oscillations from individual gear meshes to be distributed and partially cancel each other out, reducing overall horsepower loss and improving system reliability
Solution Approach 2:
The invention employs asymmetric tooth spacing between gear sets, where the angular spacing of teeth on the drive gears is deliberately non-uniform. This asymmetric configuration ensures that pressure pulses from different gear meshes occur at different phases, preventing constructive interference and reducing torque oscillation and horsepower loss
2Object-generated harmful factors
If gear meshes are used for torque transmission, then torque is transmitted, but noise, vibration, and harshness increase
Solution Approach 1:
The torque transmission function is distributed across multiple gear sets rather than relying on a single gear mesh. This segmentation reduces the noise and vibration amplitude from each individual mesh while maintaining adequate torque transmission through the combined effect of all gear sets
Solution Approach 2:
The gear sets are configured with specific tooth spacing and angular offsets to create periodic torque transmission patterns. The periodic meshing of multiple gear sets with different phase relationships creates a more uniform torque delivery that reduces vibration and harshness while maintaining power transmission
3Stress or pressure
If traditional gear spacing is used, then gear meshing occurs, but scavenge backpressure increases
Solution Approach 1:
The oil pumping function is segmented across multiple gear sets that operate in parallel. This segmentation creates multiple flow paths and distributes the pressure generation across different zones, reducing peak backpressure while maintaining overall oil flow productivity through the combined effect of all gear sets
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 pressure pulses, horsepower loss, noise, vibration, and harshness while minimizing scavenge backpressure, leading to improved pump efficiency and reduced aeration, as demonstrated by graphs showing lower outlet pressure and torque oscillation.
Implementation Method 1
The first drive gear and first slave gear are in rotational meshing cooperation for torque transmission. The second drive gear and second slave gear are in rotational meshing cooperation for torque transmission.
Data Source
AI summary
A gear assembly of a scavenge oil pump for a vehicle is provided. The assembly comprises a first pair of meshing gears comprising a first drive gear disposed about a drive shaft and a first slave gear disposed about a slave drive in parallel relationship with the drive shaft. The first drive gear and first slave gear are in rotational meshing cooperation. The assembly comprises a second pair of meshing gears comprising a second drive gear disposed about the drive shaft and a second slave gear disposed about the slave drive. The second drive gear and second slave gear are in rotational meshing cooperation. The second pair of meshing gears is disposed linearly adjacent to the first pair of meshing gears. The first pair and the second pair of meshing gears have about ⅜ of a tooth spacing relative to each other for torque transmission of scavenge oil.