Pre-combustion chamber spark plug and its manufacturing method

CN118263772BActive Publication Date: 2026-05-26FEDERAL MOGUL IGNITION LLC MI SOUTHFIELD +1
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Patent Information

Application Number
CN202311535933.6
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Priority Date
2022-12-28
Filing Date
2023-11-17
Publication Date
2026-05-26
Estimated Expiration
2043-11-17

AI Technical Summary

Technical Problem

Existing pre-combustion chamber spark plugs are prone to incomplete exhaust of residual gas under high exhaust gas recirculation conditions, leading to premature ignition, engine failure to ignite, and abnormal combustion, which increases the risk of engine damage, as well as engine manufacturing costs and complexity.

Method used

A pre-combustion chamber spark plug was designed, including a central electrode assembly, an insulator, a housing, a grounding electrode assembly, an internal storage device, and a flow channel. The flow channel communicates with the pre-combustion chamber to achieve effective management and exchange of residual exhaust gas, thereby preventing the accumulation of residual gas in the pre-combustion chamber.

Benefits of technology

Effective management of residual exhaust gases prevents premature ignition, improves engine operational stability and efficiency, reduces the risk of engine damage, and simultaneously reduces the overall complexity and manufacturing cost of the engine.

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Abstract

A pre-combustion chamber spark plug includes an internal reservoir, a flow channel portion, and a pre-combustion chamber, and is designed to operate efficiently under a variety of operating conditions and ranges. The internal reservoir includes an upper internal reservoir section and a lower internal reservoir section, the pre-combustion chamber includes an upper pre-combustion chamber section and a lower pre-combustion chamber section, and the flow channel portion fluidly connects the lower internal reservoir section and the upper pre-combustion chamber section, allowing the exchange of combustion air / fuel gases between the lower internal reservoir section and the upper pre-combustion chamber section. A ground electrode assembly with a ground electrode ring is positioned within the pre-combustion chamber such that the ground electrode assembly separates the upper and lower pre-combustion chamber sections, while the shape and size of the lower pre-combustion chamber section can be defined using a modular pre-combustion chamber cover. In one example, the flow channel portion has an average cross-sectional area (AFC), and the internal reservoir has a total volume (VRES), and the ratio AFC:VRES is greater than or equal to 0.015 (1 / mm).
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Citation Information

Patent Citations

  • Prechamber spark plug for a gas-powered internal combustion engine, and method for manufacturing same

    CN108054635A

  • Pre-combustion chamber ignition structure, system and working method thereof

    CN108321678A