Offset Opposed Fuel Pump Layout for Lower Camshaft Torque
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Solution Overview
Problem
High-pressure fuel pumps in internal combustion engines face challenges in manufacturing costs and torque load on the camshaft due to traditional linear arrangements of pumping units, which also lead to increased wear and stress on components.
Innovation Solution
A high-pressure fuel pump design featuring offset, opposing barrel units within the same plane, with a camshaft having an offset lobe and a cam ring, translating rotational movement to longitudinal plunger motion, and using modular barrel units to reduce torque load and stress on the camshaft.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If traditional monolithic block design with linear pumping units is used, then manufacturing complexity and cost increase, but structural strength is maintained
Solution Approach 1:
The pump is divided into modular barrel units that can be independently manufactured and assembled. Each barrel unit contains its own plunger, springs, and sealing components, allowing for simplified manufacturing processes and easier replacement without affecting the entire pump assembly.
Solution Approach 2:
Multiple pumping functions are combined into a single compact housing with opposing barrel units arranged in a space-efficient configuration. The camshaft assembly integrates multiple lobes that simultaneously control multiple plungers, reducing overall device complexity while maintaining manufacturing feasibility.
2Force
If conventional camshaft design is used, then significant torque load is imposed on camshaft, but reliable plunger control is achieved
Solution Approach 1:
The camshaft features an offset lobe configuration where the cam lobe is positioned eccentrically relative to the camshaft centerline. This asymmetric design creates a mechanical advantage that reduces the torque required to actuate the plungers while maintaining reliable control through the offset lever arm created by the cam ring.
Solution Approach 2:
A cam ring is introduced as an intermediary component between the camshaft lobe and the plungers. The cam ring translates the rotational motion of the camshaft into the linear motion required for plunger actuation, distributing the mechanical load and reducing direct torque demands on the camshaft while ensuring reliable plunger control.
3Reliability
If offset, opposing barrel units are used, then torque load and wear are reduced, but manufacturing precision requirements increase
Solution Approach 1:
The opposing barrel units are designed as separate modular components with standardized mounting interfaces. This segmentation allows for independent manufacturing and quality control of each barrel unit, reducing the cumulative precision requirements while maintaining the beneficial offset configuration that reduces wear and stress on components.
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 plunger and barrel wear, minimizes power loss, and allows for easier replacement and adaptation across various engine types, while maintaining efficient fuel compression and delivery.
Implementation Method 1
a camshaft having at least one offset lobe and a cam ring encircling the lobe and in contact with the plungers, which translate the rotational movement of the camshaft to longitudinal movement of the plungers
Implementation Method 2
a first spring positioned around the first plunger configured to bias the first plunger toward the camshaft assembly and a second spring positioned around the second plunger configured to bias the second plunger toward the camshaft assembly
Data Source
AI summary
The present disclosure provides a high-pressure fuel pump having barrel sets comprising offset, opposing barrel units within the same plane and having plungers disposed therein. The high-pressure fuel pump further includes a camshaft having at least one offset lobe and a cam ring encircling the lobe and in contact with the plungers, which translate the rotational movement of the camshaft to longitudinal movement of the plungers, controlling inflow, compression, and outflow of fuel within the pump.