High-Pressure Fuel Pump Actuator Reducing Friction and Vibration
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Solution Overview
Problem
The existing high-pressure fuel pump actuators have complex manufacturing processes, high material costs, and inefficiencies due to unnecessary friction and vibration, leading to increased mechanical stress and assembly complexity.
Innovation Solution
A high-pressure fuel pump actuator design featuring a U-shaped holder and pin shaft roller set, where the U-shaped holder is molded integrally with thicker walls to bear load directly from the driving cam, reducing friction and assembly complexity, and a guide sleeve with windows and flanges for reduced height and improved guidance, along with a spline locking mechanism for secure assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the guide sleeve and holder are formed together by forging, then the structural strength is improved, but the lateral force from the driving cam transmits to the guide sleeve causing vibration and damage
Solution Approach 1:
The patent divides the integrated guide sleeve and holder structure into separate components. The holder is now a separate U-shaped component that can be assembled into the guide sleeve, preventing lateral force transmission to the guide sleeve and eliminating the vibration problem while maintaining structural strength through proper load path design.
Solution Approach 2:
The holder is extracted from the integrated guide sleeve structure and made as a separate component. This allows the holder to bear lateral forces independently without transmitting them to the guide sleeve, resolving the vibration and damage issue while the guide sleeve focuses on its guiding function.
2Ease of manufacture
If the existing cylindrical guide sleeve structure is used, then the guidance function is provided, but the manufacturing process is complex and material efficiency is low
Solution Approach 1:
The guide sleeve structure is segmented by introducing windows that divide the cylindrical body into separate sections. This allows for simpler manufacturing processes and better material utilization while maintaining the guidance function through the remaining structural portions.
Solution Approach 2:
The guide sleeve transitions from a uniform cylindrical structure to one with localized variations through the windows. Material is removed only where not needed for guidance, optimizing material efficiency while maintaining structural integrity and guidance functionality in critical areas.
3Reliability
If the guide block embeds in the housing, then the axial rotation restraint is achieved, but the manufacture and assembly process becomes more complex
Solution Approach 1:
The guide block function is merged with the holder structure. The holder itself provides the axial rotation restraint through its design and positioning, eliminating the need for a separate embedded guide block and simplifying both manufacturing and assembly processes while maintaining the rotation restraint function.
Solution Approach 2:
The holder is designed to perform multiple functions: supporting the roller, bearing loads from the driving cam, and restraining axial rotation. This multi-functionality eliminates the need for separate components and simplifies the overall structure while maintaining all necessary functions.
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 design reduces the number of parts, weight, and friction, enhances reliability, simplifies assembly, and improves engine efficiency by distributing load effectively, reducing noise and abrasion while maintaining mechanical stability.
Implementation Method 1
The pin shaft roller set pushes against the driving cam. The U-shaped holder pushes against the fuel pump plunger. The rotation of the driving cam is transformed into the linear reciprocate movement of the pump actuator.
Implementation Method 2
The U-shaped holder directly bears the load from the driving cam and the high-pressure fuel pump to reduce the load of the guide sleeve, such that the friction loss is significantly reduced.
Data Source
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AI summary
A high-pressure fuel pump actuator used in an engine, which is used in a fuel injection system of an engine, is mounted on between a driving cam (4) and a fuel pump plunger (5), wherein the pump actuator includes a guide sleeve (1), a U-shaped holder (2), and a pin shaft roller set (3), wherein the pin shaft roller set (3) is mounted on the U-shaped holder (2), and wherein the U-shaped holder (2) is mounted in the guide sleeve (1); wherein symmetrical positions on a left and a right side walls of the guide sleeve (1) are provided with windows (1.4), wherein a left and a right side walls are provided with two flanges (1.1) respectively, wherein the U-shaped holder (2) includes a bottom plate (2.1) and side plates (2.2) that are located on a left and a right side of the bottom plate (2.1), wherein upon assembly, the side plate (2.2) is locked between two flanges (1.1); wherein an internal wall of the guide sleeve (1) is provided with a ring groove (1.2) which recesses inwardly, wherein a back side of the bottom plate (2.1) is provided with a tail portion (2.4) whose end surface is arc-shaped, wherein upon assembly, the tail portion (2.4) is locked in the ring groove (1.2).