Machine element or mechanism – Gearing – Interchangeably locked
Patent
1996-06-28
1997-11-04
Marmor, Charles A.
Machine element or mechanism
Gearing
Interchangeably locked
477906, 477155, B60K 4128
Patent
active
056827920
ABSTRACT:
In machines such as hauling units having electro-hydraulic transmission controls, it is desirable to ensure that in the event of an electrical malfunction or power failure the transmission remains in one of its gear ratios. In the subject invention, a dependent latching system is provided in a transmission which in the event of an electrical malfunction latches the transmission in the existing gear ratio or a gear ratio within at least two gears ratios. This is accomplished by providing a master latch valve mechanism, a logic valve arrangement, and a latching shuttle valve to act in cooperation with an electrically controlled proportional valve and a hydraulic proportional valve that controls engagement of a plurality of hydraulically actuated clutches. The master latch valve mechanism directs pressurized fluid from a source of pressurized fluid through the logic valve to urge the latching shuttle valve to an open position. In the event of an electrical malfunction, the logic valve arrangement functions to sense the engaged hydraulically actuated clutches and controls the flow of pressurized fluid to respective ones of the latching shuttle valves to maintain the transmission in one of its operative gears.
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Golan, deceased Kenneth F.
Liesener Kenneth P.
Burrows J. W.
Caterpillar Inc.
Kwon Peter T.
Marmor Charles A.
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