| 摘要 |
An electrohydraulic system for controlling the gear changing process in a mechanical, automatic gearbox having five gears. The system includes two pairs of electromagnetic valves (57, 58, and 59, 60) which control, via pressure-control valves (61, 62) the flow of pressure medium to three operating cylinders (41, 42, 43). When activated individually, the electromagnetic valves control the engagement of the first, second, third and fourth gears. Simultaneous activation of the electromagnetic valves (58, 57) of the first and third gears will result in engagement of the fifth gear, whereas simultaneous activation of the electromagnetic valves (60, 59) of the second and fourth gears will result in engagement of the reverse gear. |
