Dog clutch with locking synchronization

An apparatus consisting of a dog clutch and a locking synchronization device, said apparatus comprising:

• an externally toothed synchronizer body rotatable about an axis;
• a gear rotatable about said axis relative to said synchronizer body and alongside said synchronizer body;
• a shifting ring having internal teeth engaged with the external teeth of said synchronizer body and rotatably entrained therewith while being axially shiftable relative to said body;
• at least one radially biased pin mounted in said body, engageable in a recess formed internally of said shifting ring, and having a lateral pressure surface;
• an outer synchro ring surrounded by said shifting ring and provided with blocking teeth engageable with said internal teeth of said shifting ring upon angular offset of said outer synchro ring and said shifting ring for blocking axial displacement of said shifting ring beyond a limited axial shift, said outer synchro ring being engaged by said lateral pressure surface upon said limited axial shift of said shifting ring;
• an externally toothed element connected with said gear and adapted to receive said internal teeth to couple said gear with said shifting ring upon release of said internal teeth by said blocking teeth;
• an inner synchro ring surrounded by said outer synchro ring;
• a friction member rotationally coupled with said element and interposed between said synchro rings and frictionally engageable therewith upon said limited axial displacement of said shifting ring to synchronize the rotation of said gear with that of said synchro rings and said body;
• and
• a coupling element interconnecting said inner and outer synchro rings, received with limited circumferential play in a further recess formed in said body, enabling axial displacement of said synchro rings relative to said body, and rotationally coupling said synchro rings with said body.