Quintuplex Mud Pump Independent Pinion Shafts
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Solution Overview
Problem
Quintuplex mud pumps face issues with pinion gear replacement challenges in limited spaces and uneven load distribution between bull gears, leading to excessive wear and maintenance problems due to single-sided gear tooth usage and lack of backlash adjustment.
Innovation Solution
The design features two independent pinion shafts, each powered by a motor, with herringbone tooth profiles and floating bearings to align gears, reducing axial thrust and allowing for balanced torque distribution, and uses eccentric lobes and connecting rods to transfer motion to pistons, minimizing noise and wear.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If a common pinion shaft drives two bull gears in the prior art quintuplex pump, then the pump can be compact, but one bull gear carries larger load due to gear machining tolerances causing excessive wear and maintenance problems
Solution Approach 1:
The patent divides the single pinion shaft into two separate pinion shafts, each driving one bull gear independently. This segmentation allows each bull gear to carry equal load (50% each), eliminating the uneven load distribution and excessive wear problems that occurred when one bull gear carried the majority of the load in prior art designs.
2Ease of manufacture
If a long pinion gear is used in the prior art quintuplex pump, then the gear can be manufactured, but it becomes impractical to remove and replace in installations with limited space
Solution Approach 1:
By splitting the single long pinion gear into two separate, shorter pinion gears, the patent makes the components more manageable for replacement. Each shorter pinion gear can be removed and installed more easily in space-constrained environments compared to the long pinion gear in prior art designs, while still achieving the necessary gear drive function.
3Device complexity
If single-sided gear tooth usage is employed in the prior art bull gears, then the gear structure is simple, but the other side of the gear tooth serves no practical purpose and cannot effectively take out backlash
Solution Approach 1:
The patent employs floating bearings that allow the pinion shafts to move dynamically relative to the bull gears. This dynamic adjustment mechanism enables effective backlash elimination by allowing the pinion shafts to self-align with the bull gear teeth, making the system adaptable to manufacturing tolerances and wear over time.
4Productivity
If two bull gears are used to drive a common crankshaft in the prior art, then the pump can operate, but the uneven load distribution leads to excessive wear and the gears must be recut if cut out of tolerance
Solution Approach 1:
The patent segments the drive system into two independent pinion shafts, each driving its own bull gear, which in turn drive the crankshaft. This segmentation ensures that each bull gear carries equal load (50% each), eliminating the uneven load distribution that caused excessive wear in prior art designs where one bull gear carried the majority of the load.
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 enhances reliability and longevity by reducing pressure variations, noise, and maintenance needs, providing consistent performance and easier assembly in space-constrained environments.
Implementation Method 1
The pinion shafts in turn drive first and second bull gears which together drive a crankshaft with five eccentric lobes
Implementation Method 2
a crankshaft with five eccentric lobes... Five connecting rods are each disposed on one of the eccentric lobes and on one of the five pistons and transfer the reciprocal movement of a connecting rod to linear movement of a corresponding piston
Data Source
AI summary
A quintuplex mud pump includes a pair of motors (18), a crankshaft (40) supporting five eccentric lobes (44), and first and second bull gears (30). Each of two pinion shafts (20) are rotationally independent, and has a pinion gear interfacing with a respective bull gear on the crankshaft (40). Five connecting rods (46) interconnect a respective eccentric lobe and a respective piston.