Importance

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Abstract

A gear-shift mechanism for a gear transmission in which a shift-and-select lever on a changeover shaft is loaded by a compression spring assembled therewith toward an initial position where the shift-and-select lever is brought into engagement with a shift head for 1.sup.st -2.sup.nd speeds for selectively establishing first or second speed gear train, and in which in the occurrence of a failure in any one of a selection-stroke sensor and a shift-stroke sensor, a second actuator is deactivated under control of an electric controller to permit free movement of the changeover shaft in an axial direction and a second actuator is activated under control of the electric controller to effect rotary movement of the changeover shaft so that the shift-and-select lever is moved to the initial position under the load of the compression spring and brought into engagement with the shift head to establish first or second speed gear train.

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First Claim