| 摘要 |
<p>A solenoid 4, for use in a transmission differential unit, comprises a bobbin 4a carrying solenoid windings 4b, an outer casing 4c and end plates 4d and 4e. The end plate 4d has a hole to allow transmission fluid to escape ahead of the plunger 40 and both end plates 4d and 4e are perforated to allow transmission fluid to flow through an interior of the solenoid 4. Plunger 40 is hollowed at 4i to allow escape of transmission oil. A gap between solenoid windings 4b and the casing 4c allow passage of oil and the solenoid windings 4b are insulated from the oil by a membrane. The solenoid 4 has sensors with associated lead 4s is connected to a slip ring and the sensors indicate solenoid 4 operation. For example, four solenoids 4 are used to actuate a differential lock in the differential unit which may be retro-fitted to a vehicle.</p> |
