Drain mechanism for hydraulic power transmission joint
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United States of America Patent
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-
Sep 24, 2002
Grant Date -
N/A
app pub date -
May 15, 2000
filing date -
May 17, 1999
priority date (Note) -
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status (Latency Note)
Importance
Abstract
A limiter plug and a drain plug are juxtaposed in a valve block. The limiter plug is provided with a thermo-switch of which operation, when a predetermined temperature is reached, opens a communication passage for drainage by means of a limiter pin. The drain plug is provided with a drain pin for draining a high-pressure oil in conjunction with the drainage action of the limit pin induced by the thermo-switch so that, when the predetermined temperature is reached, it substantially nullifies the torque for switching from 4 wheel-drive to 2 wheel-drive. In the status of no operation of the thermo-switch, the drain pin when a predetermined torque is reached, gradually opens the drain hole while catching a balance, to limit the torque to a predetermined value.
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