Shift synchronizer for two speed transfer case and the like

A synchronizer adapted for use between two drive members rotatable at distinct speeds and an output member comprising, in combination,

• a first drive member having a friction surface and first gear teeth,
• a second drive member having a second clutch surface and second gear teeth,
• a shift sleeve rotationally coupled to said output member and axially slidable thereupon, said shift sleeve including male gear teeth disposed thereabout,
• a pair of blocker rings each having a friction surface, one of said surfaces of said pair of blocker rings disposed adjacent a respective one of said friction surfaces of said first member and said second member,
• a plurality of struts disposed between said pair of blocker rings and about said shift sleeve, said struts including a peripheral groove and a tensioning spring disposed in said groove and extending about said struts, and
• a detent structure operably disposed between said struts and said shift sleeve.

A transfer case synchronizer adapted for use between a first drive member, a second drive member and an output member comprising, in combination,

• a first, direct drive member having a friction surface and first gear teeth,
• a second, reduced speed drive member having a second friction surface and second gear teeth,
• a shift sleeve rotationally coupled to said output member and axially slidable thereupon, said shift sleeve including gear teeth disposed thereabout,
• a pair of blocker rings each having a friction surface, one of said friction surfaces of said pair of blocker rings disposed adjacent a respective one of said friction surfaces of said first member and said second member,
• a plurality of struts disposed about said shift sleeve and between said pair of blocker rings, said struts including a groove and a tensioning spring disposed in said groove and extending about said struts, and
• cooperating detent structures disposed on said shift sleeve and said struts
• whereby said gear teeth of said shift sleeve are engageable with either said first gear teeth to provide direct drive to said output member or said second gear teeth to provide reduced speed drive to said output member.