| 摘要 |
A clutch assembly for a vehicle with selective front wheel drive includes an aut omatic oil level control system. The clutch assembly includes a housing which encloses a hydraulic clutch. The hydraulic clutch, when engaged, connects a front wheel drive shaft t o a main vehicle drive shaft. Since the hydraulic clutch has a tendency to leak fluid int o the housing, the fluid level within the housing is controlled by pressurizing the housing via compressed air from a turbocharger or the like. A pair of blow back tubes extend into the housi ng from opposite sides of the housing, and are interconnected and then connected to an u npressurized reservoir, such as the crankcase or transmission case, via an excess oil evacuat ion line. The blow back tubes have open ports which are positioned such that, when oil simulta neously covers the ports in both blow back tubes, excess oil is evacuated to the connect ed reservoir. The blow back tube ports are positioned such that excess oil is detected and eva cuated when the clutch and drive shaft are static or dynamically rotating.
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