Thermal disconnect

Details Thermal disconnect Thermal disconnect

1990-11-08

1992-04-14

Lorence, Richard

192 clutches and power-stop control

Latch operated

Longitudinally moving transmission member

192 82T, 192101, F16D 1110, F16D 4325

Patent

active

051039494

ABSTRACT:
Inoperability due to solenoid freeze-up, electrical malfunction or human error in a mechanical disconnect system for disconnecting first and second shafts includes a disconnect plunger, a first spring for urging the disconnect plunger toward the first shaft whereby the disconnect plunger causes the first shaft to disengage the second shaft when the disconnect plunger is in contact with the first shaft, a solenoid having an armature and windings and a solenoid plunger coupled to the solenoid armature. A second spring urges the solenoid plunger into engagement with the disconnect plunger to thereby prevent movement of the disconnect plunger into engagement with the first shaft. The solenoid windings are controllably energized to move the solenoid armature such that the solenoid plunger is retracted from the disconnect plunger. An expandable material is disposed in a confined volume of space between the disconnect plunger and the solenoid whereby the expandable material expands when heated to a certain temperature to in turn move the solenoid plunger, solenoid armature and solenoid windings away from the disconnect plunger and thereby cause the disconnect plunger to contact the first shaft under the influence of the first spring.

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Johnson, et al., U.S. patent application Ser. No. 07/439,783, filed Nov. 7, 1989, entitled "Thermal Operator for Use in a Mechanical Disconnect or the Like".

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