Plastic Bearing Bushing for High-Pressure Fuel Pump
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Solution Overview
Problem
High-pressure fuel pumps with metal bearing bushes face high production costs due to precision machining and coating, and suffer from uneven pressure distribution and poor emergency running properties under insufficient lubrication, leading to increased wear.
Innovation Solution
A high-pressure fuel pump with a bearing bush made of a plastic material, such as PEEK or PPA, which provides better elasticity and uniform pressure distribution, and can be easily produced, with optional fillers for improved emergency running properties and sliding properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a metal bearing bushing is used in the roller plunger, then the structural strength is sufficient, but the manufacturing complexity increases due to precision machining and coating requirements
Solution Approach 1:
The patent changes the material parameter from metal to plastic (specifically polyamide or polyetheretherketone), which fundamentally alters the manufacturing approach. Plastic bearing bushings can be produced via injection molding or pressing, eliminating the need for complex precision machining and coating processes while maintaining sufficient structural strength for the application
Solution Approach 2:
The patent adopts a plastic bearing bushing that is easier and cheaper to manufacture, accepting that it may have a different service life characteristics compared to metal. The plastic material allows for simpler production methods (injection molding, pressing) that reduce manufacturing complexity while still providing adequate durability for the bearing application
2Manufacturing precision
If a metal bearing bushing is used, then the manufacturing precision can be controlled, but the pressure distribution becomes uneven leading to increased wear in edge regions
Solution Approach 1:
The patent changes the material parameter from metal to plastic, which fundamentally alters the pressure distribution characteristics. The plastic material's elasticity and compliance allow it to conform to the bearing pin and roller surfaces, distributing pressure more uniformly across the contact area and eliminating the edge concentration problem inherent in rigid metal bushings
3Force
If a metal bearing bushing is used, then the load-bearing capacity is sufficient, but the emergency running properties deteriorate under insufficient lubrication conditions
Solution Approach 1:
The patent changes the material parameter from metal to plastic, which fundamentally improves emergency running properties. Plastic materials have inherent self-lubricating characteristics and can withstand dry running conditions much better than metal, preventing severe wear and damage when lubrication is insufficient or absent, while still maintaining adequate load-bearing capacity
Solution Approach 2:
The patent adopts a plastic bearing bushing that is designed to perform adequately under emergency conditions without requiring complex lubrication systems. The plastic material's ability to handle dry running conditions replaces the need for sophisticated lubrication infrastructure, providing reliable emergency 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 use of plastic bearing bushes reduces production costs and wear, while ensuring consistent performance even under low lubrication conditions.
Implementation Method 1
the higher elasticity of the plastic material compared to steel allows for a more uniform pressure distribution
Implementation Method 2
A roller 42 is rotatably mounted and rolls on the cam 22
Data Source
Figure 1
Figure 2
AI summary
Disclosed is a pump, in particular a high-pressure fuel pump, comprising at least one pump element (10) that has a roller tappet (20) inside which a roller (42) is rotatably mounted on a bearing bolt (44) by means of a bearing sleeve (46), said roller (42) rolling off a cam (22) of an input shaft (24). The bearing sleeve (46) is made of a plastic material, especially polyether ether ketone (PEEK) or polyphthalamide (PPA).