Fuel rail assembly

The fuel rail assembly addresses the challenge of purging lubricant supply systems in gaseous fuel engines by incorporating a purging path for lubricant dozers, ensuring efficient air removal and improved injector performance.

WO2026139513A1PCT designated stage Publication Date: 2026-07-02PHINIA DELPHI LUXEMBOURG SARL
View PDF 0 Cites 0 Cited by

Patent Information

Authority / Receiving Office
WO · WO
Patent Type
Applications
Current Assignee / Owner
PHINIA DELPHI LUXEMBOURG SARL
Filing Date
2025-12-22
Publication Date
2026-07-02

AI Technical Summary

Technical Problem

Existing fuel rail assemblies for gaseous fuel engines face issues with lubricant supply systems that cannot be easily purged, leading to air bubbles and performance degradation due to trapped air, which affects the service life and operational reliability of fuel injectors.

Method used

A fuel rail assembly with a lubricant supply system featuring lubricant dozers that include a purging path to remove air from the system, utilizing a purging module or clearance around the pumping plunger to ensure efficient purging and prevent air bubble formation.

Benefits of technology

The purging path effectively removes air from the lubricant dozers, enhancing the performance and reliability of the fuel injectors by preventing air bubble-related issues, thus improving the service life and operational efficiency of the system.

✦ Generated by Eureka AI based on patent content.

Smart Images

  • Figure EP2025088804_02072026_PF_FP_ABST
    Figure EP2025088804_02072026_PF_FP_ABST
Patent Text Reader

Abstract

A fuel delivery system for a gaseous fuel internal combustion engine comprises a fuel rail and a lubricant supply system. The fuel rail includes a supply port for connection to a pressurized gaseous fuel source and a plurality of outlet ports for coupling with a corresponding plurality of fuel injectors. The lubricant supply system comprises a plurality of lubricant dozers configured to release lubricant into respective gaseous fuel streams at each outlet port of the fuel rail, or downstream thereof. Each lubricant dozer includes a pumping chamber communicating with a lubricant outlet port, a pumping plunger that is adapted to displace lubricant from the pumping chamber in order to release a defined volume of lubricant during a release process, an inlet port from which lubricant is fed to the pumping chamber, and a control port where lubricant may be applied to actuate the pumping plunger. The lubricant supply system (30) comprises a supply piping (45), which is connected to the inlet port (36) of each lubricant dozer (31), and a control piping (46), which is connected to the control port (42) of each lubricant dozer (31). The lubricant supply system comprises a purging path configured to purge air out of the lubricant dozers.
Need to check novelty before this filing date? Find Prior Art