Gear-Driven Diesel Fuel Injection Pump Side Loading Reduction
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Solution Overview
Problem
The existing diesel fuel injection pump systems face issues with high drive torque irregularities from the crankshaft, leading to friction and wear on the fuel pump, particularly due to side loading on the lubricated bearings, which reduces the pump's longevity and efficiency.
Innovation Solution
The implementation of a gear-driven system where an idler gear is used to transmit rotational motion from the crankshaft to the fuel pump drive gear, reducing side loading and frictional losses by directly coupling the input shaft of the fuel pump to the fuel pump drive gear, thereby minimizing the impact of drive torque irregularities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the fuel pump is directly driven by the crankshaft, then the fuel pump receives high drive torque, but side loading and friction increase causing wear on bearings
Solution Approach 1:
An idler gear is introduced as an intermediary component between the crankshaft and the fuel pump drive gear. This idler gear transmits rotational motion from the crankshaft to the fuel pump while preventing direct engagement, thereby eliminating side loading on the fuel pump bearings and reducing frictional wear.
2Reliability
If belts and pulleys are used to drive the fuel pump, then side loading is reduced, but the system size and complexity increase
Solution Approach 1:
The belt and pulley components are completely removed from the drive system. Instead, a compact gear-based drive mechanism is implemented using an idler gear and a fuel pump drive gear, both of which are already present in the engine's timing mechanism, thereby reducing system complexity and eliminating the need for additional belts and pulleys.
3Reliability
If a gear-driven system with idler gear is used, then side loading and friction are reduced, but the number of components increases
Solution Approach 1:
The idler gear and fuel pump drive gear serve multiple functions: they transmit rotational motion from the crankshaft to the fuel pump, maintain proper timing synchronization, and eliminate side loading on bearings. By utilizing existing gear components for multiple purposes, the system achieves friction reduction without significantly increasing the number of 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
This solution reduces side loading and frictional losses, increases the longevity of the fuel pump, and decreases the overall size and cost of the engine system by eliminating the need for belts and pulleys, while maintaining consistent fuel delivery to the cylinders.
Implementation Method 1
an idler gear in meshing engagement with a first end of a crankshaft; a fuel pump drive gear in meshing engagement with the idler gear
Data Source
AI summary
Methods and systems are provided for a gear driven diesel fuel injection pump of an engine. In one example, a front end of an engine includes an idler gear in meshing engagement with a first end of a crankshaft and a fuel pump drive gear in meshing engagement with the idler gear. The front end of the engine may further include a fuel pump, where an input shaft of the fuel pump is directly coupled to the fuel pump drive gear.