Plunger Pump Bearing Guide Unit Oil Feed
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Solution Overview
Problem
Conventional plunger pumps experience overheating and durability issues due to air bubbles in the oil caused by negative pressure, which can lead to malfunction in control brake devices when used.
Innovation Solution
A bearing mechanism with a cage and guide unit that feeds oil in an axial or radial direction, utilizing fin portions and convex portions to reduce negative pressure and maintain an adequate oil film thickness, comprising ball and needle bearings with balancers to ensure efficient lubrication and oil distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the bearing is rotated at high speed, then the lubrication effect is improved, but negative pressure causes air bubbles to form in the oil
Solution Approach 1:
The guide unit feeds oil to the bearing in advance before the rolling elements reach the lubrication zone, ensuring adequate oil film formation and preventing negative pressure-induced air bubble formation during high-speed rotation
Solution Approach 2:
The guide unit acts as an intermediary component between the oil supply and the bearing, controlling oil distribution to maintain proper lubrication and prevent harmful negative pressure effects
2Loss of energy
If the oil film thickness is reduced, then the friction is decreased, but the bearing overheats and durability deteriorates
Solution Approach 1:
The guide unit provides localized oil feeding at specific positions on the bearing, ensuring adequate oil film thickness where needed while maintaining efficient lubrication overall, preventing both excessive friction and overheating
3Productivity
If the plunger pump is used in a control brake device, then the pumping function is achieved, but air bubbles in the oil cause malfunction
Solution Approach 1:
The guide unit extracts and removes air bubbles from the oil by providing controlled oil flow paths that allow gas separation, preventing air bubble contamination from reaching the control brake device while maintaining pumping efficiency
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 negative pressure, prevents air bubble formation, and enhances the durability and reliability of the bearing and plunger pump, ensuring stable operation of control brake devices.
Implementation Method 1
the oil of the bearing is flown to the side of the outer race side due to the centrifugal force of the eccentric cam, and a negative pressure arises on the inner race side
Data Source
AI summary
A bearing comprises a cage which is provided on a circumference of a rotary shaft to hold elements rotating in an oil. A guide unit is provided on the cage to feed the oil in an axial direction or a radial direction of the rotary shaft.