Reverse brake for manual transmissions

A manual transmission for a vehicle comprising:

• a housing;
• a input shaft rotatably mounted in said housing;
• a clutch hub mounted on said input shaft and adapted to rotate with the input shaft, said clutch hub having an externally splined surface on an outer circumference thereof;
• a shift sleeve having an internally splined surface slidably coupled to said externally splined surface of said clutch hub and being axially movable thereon;
• a reverse brake cone disposed on a first side of said shift sleeve and having a external frustoconical friction surface, said reverse brake cone further including at least extending tang;
• a first blocker ring disposed between said reverse brake cone and said shift sleeve for developing synchronizing torque therebetween upon axial movement of said shift sleeve in a first direction;
• and
• abutment means for limiting and stopping rotation of said reverse brake cone, said abutment means including a plurality of axially extending portions axially extending from said housing such that adjacent axially extending portions define at least slot for receiving said at least one tang and permitting limited rotation of said reverse brake cone, said extending portions includes an inwardly extending radial flange portion, and further wherein said abutment means further comprises a pair of stop wall portions formed on each of said inwardly extending radial flange portions;
• and
• limiting means for permitting limited radial translation of said reverse brake cone.

A reverse brake arrangement for a manual transmission of the type including a housing, the reverse brake arrangement comprising:

• a shaft rotatably supported by the transmission housing;
• a clutch hub mounted on said shaft and adapted to rotate with said shaft, said clutch hub having a splined outer circumference;
• a shift sleeve engaged with said splined outer circumference of said clutch hub by a spline movable in the axial direction of said shaft;
• a frustoconical cone in coaxial relation to said shaft and disposed on a first side of said clutch hub, said frustoconical cone having a frustoconical surface on an outer periphery thereof;
• a first blocker ring coaxial with said shaft, said first blocker ring including a conical surface adapted to be fitted on said frustoconical surface of said frustoconical cone, such that axial translation of said shift sleeve in a direction toward said frustoconical cone urges said first blocker ring against said frustoconical cone;
• at least one tang extending from said frustoconical cone;
• and
• at least one slot defined by a portion axially extending from the housing such that said at least one slot receives said at least one tang so as to permit limited radial translation and limited rotation of said frustoconical cone.

A method of arresting the rotation of a shaft rotatably supported in a housing of a transmission, the method comprising the steps of:

• mounting a clutch hub having a splined outer circumference on the shaft, said clutch hub adapted to rotate with the shaft;
• slidably engaging a shift sleeve having a spline with said splined outer circumference of said clutch hub;
• mounting a frustoconical cone in coaxial relation to the shaft on a first side of said clutch hub, said frustoconical cone having a frustoconical surface on an outer periphery thereof and at least one tang extending therefrom;
• mounting a blocker ring coaxial with the shaft, said blocker ring including a conical surface adapted to be fitted on said frustoconical surface of said frustoconical cone;
• axially translating said shift sleeve toward said frustoconical cone;
• urging said blocker ring against said frustoconical cone;
• and
• permitting limited rotation and radial translation of said frustoconical cone as said blocker ring is urged against said frustoconical cone.