High-Pressure Fuel Pump Protector Thermal Insulation
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Solution Overview
Problem
Internal combustion engines face issues with heat transmission from the engine body to the high-pressure fuel pump, leading to increased temperatures and bubble formation in the fuel supply passage, which can cause operational inefficiencies and potential damage.
Innovation Solution
A plastic protector with a bottom plate and wall plate is positioned between the engine body and the high-pressure fuel pump, acting as a heat-shielding layer, and metal collars are used to prevent creep deformation and maintain fastening force, while being made of fiber-reinforced plastic to provide high strength and reduce weight.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the high-pressure fuel pump is directly coupled to the engine body, then the structural complexity is reduced, but the temperature of the fuel pump increases due to heat transmission
Solution Approach 1:
A plastic protector is introduced as an intermediary component between the engine body and the high-pressure fuel pump. This protector serves as a thermal barrier that reduces heat transmission from the engine body to the fuel pump, thereby limiting temperature increases while maintaining the direct coupling structure.
2Weight of moving object
If plastic members are used for the protector, then the weight is reduced, but the fastening force decreases due to creep deformation under high temperature
Solution Approach 1:
The protector is made from fiber-reinforced plastic, which combines the lightweight advantage of plastic with the high strength and creep resistance of fiber materials. This composite structure maintains fastening force under high-temperature conditions while keeping the overall weight low.
3Reliability
If metal collars are added to prevent creep deformation, then the fastening force is maintained, but the weight increases
Solution Approach 1:
Metal collars are added only at specific locations where bolts are inserted, rather than making the entire protector from metal. This localized reinforcement provides the necessary creep resistance and fastening force maintenance while minimizing the weight increase.
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 configuration effectively limits temperature increases in the high-pressure fuel pump, reduces bubble formation, maintains fastening force, and decreases the engine's weight by using lightweight, high-strength materials.
Implementation Method 1
the plastic protector serves as a heat-shielding layer. Thus, as compared to when, for example, the flange is directly coupled to the mounting surface, temperature increases in the high-pressure fuel pump are limited
Data Source
AI summary
A high-pressure fuel pump and a protector are coupled to an outer side of an engine body of an internal combustion engine. A wall plate surrounds the high-pressure fuel pump to protect the high-pressure fuel pump. A cover of the high-pressure fuel pump has a flange. The engine body has a mounting surface. The bottom plate and the flange are fastened to the mounting surface by a bolt with the bottom plate held between the flange and the mounting surface.