US Patent 9982588 Pre-combustion chamber assembly for internal combustion engines

A pre-chamber assembly for an internal combustion engine is disclosed. The pre-chamber assembly may have a pre-chamber main body configured to be mounted to the internal combustion engine and defining at least a portion of a pre-chamber extending along a longitudinal axis. The pre-chamber assembly may also have an ignition electrode. The ignition electrode may have a center electrode and at least one electrode arm extending from the center electrode at least partially into the pre-chamber. The at least one electrode arm may extend in both a radial direction with respect to the longitudinal axis and an axial direction with respect to the longitudinal axis. Additionally, the pre-chamber assembly may have a mass element including at least one radial inner face facing the at least one electrode arm. The at least one radial inner face may be non-parallel with respect to the longitudinal axis.