Gas spring and damper assemblies as well as suspension systems including same

An end member assembly having a longitudinal axis and dimensioned for securement to an associated flexible spring member, said end member assembly comprising:

• a first end member including a first end member wall with a first side surface portion extending peripherally around said longitudinal axis and a plurality of projections disposed in peripherally-spaced relation to one another about said longitudinal axis, said plurality of projections extending longitudinally along and projecting radially beyond said first side surface portion toward an end surface portion that is radially offset from said first side surface portion, said plurality of projections including opposing outer side surface portions extending longitudinally therealong between said first side surface portion and said end surface portion;
• a second end member positioned axially coextensive with said first end member, said second end member including a second end member wall with a second side surface portion extending peripherally around said longitudinal axis and a plurality of grooves spaced peripherally about said longitudinal axis, said plurality of grooves extending longitudinally along and radially beyond said second side surface portion with each of said plurality of grooves dimensioned to receive a portion of one of said plurality of projections, each of said plurality of grooves including a groove closed end at least partially formed by said second side surface portion and a groove open end radially opposite said groove closed end with groove inner side surface portions spaced laterally apart from one another such that said groove is defined therebetween;
• and,
• a sealing device sealingly disposed between said first and second end members;
• said second end member engaged with said first end member such that each one of a first quantity of said plurality of projections extends into a different one of said plurality of grooves and axially-coextensive engagement of said outer side surface portions of said first quantity of said plurality of projections with corresponding said inner side surface portions of said plurality of grooves thereby retains said first and second end members in substantially rotationally-fixed relation relative to one another, each of a second quantity of said plurality of projections being rotationally unconstrained by said plurality of grooves, and said end surface portion of said plurality of projections abuttingly engaging said second surface portion of said second end member thereby radially constraining said first and second end members coaxially with one another.