Blocking system for motor vehicle automatic gearboxes has a spring-loaded piston and locking rod which is released by hydraulically pressurizing the piston by a pump

摘要

The blocking cylinder (1) has a piston (2) biased into a blocking position by a spring which is depressed by a pump (3) from a hydraulic reservoir (4) and activated by a pressure switch (6). A pressure reservoir (5) may be added to reduce the pump action.