Shift mechanism for a manual planetary transmission
View Patent ↗A shift mechanism for a manual planetary transmission has a plurality of control members. Each control member has a slot configuration for each shift rail defined therein. The slot configurations are aligned among plates and a pin member is inserted in each of the slot configurations. Manipulation of any one of the plates produces movement of two or more of the pin members. The pin members are operable upon movement to select the engagement of the synchronizers, which are disposed within a power transmission. The synchronizers establish drive ratios between the input shaft for the transmission and the output shaft for the transmission.
1. A control mechanism for a planetary manual transmission having multiple synchronizers each having a neutral position and at least one engaged position and a plurality of shift control rods adapted to move the synchronizers, said control mechanism comprising:
a plurality of slotted plate members each having a distinct slot configuration for each shift control rod;
a control pin secured to each of said shift control rods and disposed in each of said slot configurations in each of said slotted plate members; and
means for manipulating said slotted plate members individually to enforce selective movement of said pins to thereby control at least two synchronizers into respective engaged positions, and
means for preventing movement of more than one said slotted plate member at a time.
2. The control mechanism defined in claim 1 further comprising:
at least one of said slotted plate members being a neutral member; and
the remaining slotted plate members being ratio control members.
3. The control mechanism defined in claim 1 further comprising:
at least four ratio control members; with at least one of said four ratio control members being a reverse ratio control member.
4. The control mechanism defined in claim 3 further wherein:
at least three of said slotted plate members are each moveable to individually establish at least two forward ratios.
5. The control defined in claim 1 further wherein:
each of said slotted plate members is a substantially flat plate member; and
said means for preventing movement of more than one slotted plate member at a time comprising each of said flat plate members having a pair of spaced longitudinal grooves that are nested when all of the plate members are positioned in a neutral position.
6. The control mechanism defined in claim 5 further wherein:
each of said spaced longitudinal grooves has a predetermined depth and a movement of one of said plate members from the neutral position to a ratio position causing the remaining plate member to be moved vertically a distance equal to twice said predetermined depth.
7. The control mechanism defined in claim 1 further wherein:
each of said slotted plate members are tubular structures that are individually moveable and restrained from movement by said means for preventing movement of more than one slotted plate member at a time.
8. A control mechanism for a planetary manual transmission having multiple synchronizers each having a neutral position and at least one engaged position comprising, in combination:
a plurality of shift rails adapted to move such synchronizers,
a plurality of slotted plate members each having a distinct slot configuration for each shift rail;
a control pin secured to each of said shift rails and disposed in said slot configurations in each of said slotted plate members; and
means for manipulating said slotted plate members to achieve selective movement of said pins to translate at least two of such synchronizers into respective engaged positions, and
means for preventing movement of more than one of said slotted plate members at a time.
9. The control mechanism defined in claim 8 wherein said shift rails are disposed in parallel.
10. The control mechanism defined in claim 8 wherein said means for preventing movement includes a pair of parallel grooves in each slotted plate member, said grooves being nested when said control mechanism is in a neutral position and springs for applying a biasing force to said slotted plate members.
11. The control mechanism defined in claim 8 wherein said means for manipulating said plate members includes a slotted portion associated with said plate members, said slotted portions being aligned when said plate members are in a neutral position and a shift control pin movable fore-and-aft and transversely in said slotted portions.