Welded High-Pressure Fuel Pump Roller Tappet Design
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Solution Overview
Problem
Current high-pressure fuel pump roller tappets are bulky, heavy, and prone to interference within the engine, leading to increased friction, wear, and reduced engine efficiency due to poor stiffness and connection methods.
Innovation Solution
A welded high-pressure fuel pump roller tappet design featuring a guide sleeve, U-shaped holder, and pin-shaft-roller set, where the guide sleeve and U-shaped holder are connected by welding, with inflexed flanges and arc-shaped opening slots to reduce height and mass, enhance stiffness, and prevent interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If extruding deformation or pin connection is used to connect the shell and holder, then the connection method is simple, but the overall stiffness of the tappet is poor
Solution Approach 1:
The patent merges the shell and holder into a single integrated component through welding, eliminating the need for separate connection elements like pins or extruding deformation features. This merging approach directly improves overall stiffness while simplifying the connection method, as the welded joint creates a rigid monolithic structure.
2Strength
If the roller tappet is designed with larger height and mass, then the structural strength is sufficient, but the moving inertial force is huge causing interference with engine structure
Solution Approach 1:
The patent changes the structural parameters by integrating the shell and holder through welding, which allows for a more efficient load-bearing structure. This parameter change enables reduction in both height and mass while maintaining sufficient structural strength, thereby reducing moving inertial force and interference with engine components.
3Length of moving object
If the guide sleeve height is reduced, then the overall weight and interference are reduced, but the stiffness may be compromised
Solution Approach 1:
The welding connection between the guide sleeve and holder merges these components into a rigid integrated structure. This merging provides exceptional stiffness even with reduced guide sleeve height, as the welded joint creates a continuous load path that compensates for the reduced dimension.
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 results in a lighter, more stable, and efficient roller tappet with reduced friction and wear, improved engine efficiency, and simplified installation, capable of withstanding high pressures and harsh environments.
Implementation Method 1
the guide sleeve and the U-shaped holder are connected by welding, ensuring the stiffness of the guide sleeve
Data Source
AI summary
A welded high-pressure fuel pump roller tappet, which is used for the fuel injection system in an engine, includes a guide sleeve, a U-shaped holder and a pin-shaft-roller set. Symmetrical positions on the upper portion of left and right sidewalls of the guide sleeve are provided with inflexed flanges. Two sides of the flange are folded inwardly to form a limiting slot. The U-shaped holder includes a bottom plate and side plates located on left and right sides of the bottom plate. Symmetrical positions on two side plates are provided with axle holes. The pin-shaft-roller set is set up between two side plates of the U-shaped holder. Symmetrical positions on the upper portion of the flange are provided with opening slots. After assembly, the U-shaped holder is located between two flanges. Two side plates are located inside the limiting slots in the flanges.