Fuel pump

The fuel pump design addresses piston seizure and fuel leakage issues by optimizing the ring's geometric and dimensional characteristics, achieving reduced deformations and improved fit, thus enhancing reliability under high pressures.

WO2026109685A1PCT designated stage Publication Date: 2026-05-28PHINIA DELPHI LUXEMBOURG SARL
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Patent Information

Authority / Receiving Office
WO · WO
Patent Type
Applications
Current Assignee / Owner
PHINIA DELPHI LUXEMBOURG SARL
Filing Date
2025-11-21
Publication Date
2026-05-28

AI Technical Summary

Technical Problem

Existing fuel pumps for direct injection systems in internal combustion engines face issues with piston seizure due to improper fit between the piston and the ring, leading to fuel leakage or deformation, which is exacerbated by high operating pressures and weld-induced deformations.

Method used

The fuel pump design includes a ring positioned with a first bulge located 20-40% from its end within the housing, an outer diameter of 150-200% of the piston, and a wall thickness of 20-35% of the body thickness, with a crimped collar to secure the ring, minimizing deformations and ensuring a reliable fit.

Benefits of technology

This design reduces circularity errors by 50-70%, minimizing piston seizure risk and fuel leakage, while maintaining structural integrity under high pressures.

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    Figure EP2025083767_28052026_PF_FP_ABST
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Abstract

The invention relates to a fuel pump comprising: a pump body (1); a bushing (4) accommodated in a recess (10) in the pump body (1), the recess (10) opening at one end toward the outside of the pump body (1) and at the other end into a compression chamber (2); and a piston (3) translationally movable in the bushing (4) for compressing fuel in the compression chamber (2), the bushing (4) being tightly mounted in the recess (10) by means of two bulges (41, 42) protruding from a cylindrical outer surface of the bushing (4), the pump being characterized in that a first of the bulges (41) at a first end (43) of the bushing (4) on the compression chamber (2) side is located at a distance from the end of the bushing (4) of between 20% and 40% of the length of the bushing (4).
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Citation Information

Patent Citations

  • Fuel pump

    WO2023105024A1

  • Fuel pump for a direct injection system with a reduced stress on the bushing of the piston

    EP3088725A1

  • Fuel pump for a direct injection system

    FR3112817A3

  • Fuel Pump

    US20230193865A1

  • Gasoline direct injection fuel pump with isolated plunger sleeve

    US20230304462A1