Lockout system for automatic transmission

Machine element or mechanism – Rotary member or shaft indexing – e.g. – tool or work turret – Preselected indexed position

Patent

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Details

74876, 74476, F16H 5706

Patent

active

050638173

ABSTRACT:
A system for preventing damage to automatic transmissions due to improper shifting is disclosed. The system includes a blocking member and an actuator which externally mount to a transmission. The blocking member mounts to a shifter shaft of the transmission and rotates with the shifter shaft as gears are being selected. The blocking member includes a cam portion which has at least one hole therein. The actuator mounts at a stationary position on the transmission in which a plunger portion of the actuator is near the cam of the blocking member. The plunger is spring-biased to extend toward the cam unless the actuator is actuated. The hole in the cam is aligned with the plunger when the transmission is in neutral. Accordingly, unless the actuator is actuated, the plunger is forced into the cam hole when an attempt is made to shift between forward and reverse gears. A controller is configured to actuate the actuator when the speed of an engine is around an idle speed and when a movement sensor indicates that a vehicle is or should be stopped. When the actuator is actuated, the plunger is retracted from the cam hole, and the transmission may be shifted to any forward or reverse gear.

REFERENCES:
patent: 2916937 (1959-12-01), Iavelli
patent: 3602061 (1971-08-01), Nemiroff
patent: 4255984 (1981-03-01), Abels et al.
patent: 4524635 (1985-06-01), Hulin et al.
patent: 4534237 (1985-08-01), Carosino
patent: 4945482 (1990-07-01), Nishikawa et al.

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