Synchronizer clutch

A new synchronicer cluch comprising:

• a shaft:
• a brake drum non-rotatory fixed to a housing and surrounding a portion of said shaft to define an annular chamber therebetween, said brake drum having clutch teeth formed thereon;
• a clutch pack located in said clutch chamber and including a set of inner clutch plates mounted for rotation with said shaft and which are interleaved with a set of outer clutch plates mounted for rotation with said brake drum;
• a clutch hub fixed for rotation with said shaft and having external spline teeth;
• synchronizer assembly disposed between said clutch hub and said brake drum and operable for causing speed synchronization therebetween, said synchronizer assembly including a cone ring mounted for rotation with said shaft and limited axial movement relative to said cluth pack, and a blocker ring supported on said ring;
• and
• a shift sleeve having internal spline teeth meshed with external spline teeth on said clutch hub that said shift sleeve is supported for rotation with said clutch hub an axial movement thereon between first and second positions, said shift sleeve is operable to cause axial movement of said cone ring in response to movement between its first and second positions, said shift sleeve is operable in its first position to release its internal spline teeth from meshed engagement with said clutch teeth on said brake drum and locate said cone ring in a position released from engagement with said cluth pack such that said shaft said permitted to rotate to said brake drum, and said shift sleeve is operable in its second position to engage its spline teeth in meshed engagement with said cluth teeth on said brake brake drum and locate said cone ring in a position engaged with said clutch pack to exert a clamping to exert a clamping force thereon such that said shaft is prevented from rotating relative to said drum.