Transmission shift control
AssigneeBorg-Warner Corporation
InventorsDale F. Huffman, Charles E. Zeh
Life of this patent
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Abstract
A transmission shift control mechanism for preventing inadvertent movement toward the reverse gear engaging position during forward upshifting or downshifting, thereby reducing the forward shift time and thus reducing harmful engine emissions. The shift lever is guided in its movement between shift rails, and blocked from moving to the reverse shift rail engaging position until an additional movement is made. Shift rail collars define shift lever guides, the reverse one of which is offset from the forward guides to thereby require the additional movement of the shift lever.
Claims6
In a multiple speed ratio power transmission mechanism having gear elements selectively engagable for defining torque delivery paths between a driving member and a driven member, shift elements movable for selectively engaging said gear elements, and a shift member movable for selectively engaging and moving said shift elements, the improvement wherein said shift member is movable in a first plane into at least one engaging position and in a second plane into another engaging position, said shift elements defining gates, one of said shift elements defining a gate offset from the remainder thereof, said one shift element blocking movement of said shift member in said first plane into its gate and allowing movement of said shift member in said second plane into its gate to establish said other engaging position, another of said shift elements defining a gate having a portion thereof enlarged adjacent said offset gate, thereby facilitating movement of said shift member between said planes.
In a control for a multi-speed tranmission, first, second and third elements selectively movable for changing transmission output, said first and second elements respectively defining first and second gates in alignment, said third element defining a third gate out of alignment with said first and second gates, a shift member selectively movable in one path into said aligned gates for engaging one of said first and second elements and in another path into said third gate for engaging said third element, said third element blocking movement of said shift member into said third gate in said one path, said second gate having a chamfered portion adjacent said third gate for facilitating movement of said shift member between said second and third gates.
Dependencies are inferred from the claim text.