Machine element or mechanism – Gearing – Interchangeably locked
Patent
1996-06-28
1997-11-04
Wright, Dirk
Machine element or mechanism
Gearing
Interchangeably locked
477906, F16H 6112
Patent
active
056827911
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 the gear that it was in when the electrical malfunction occurred. In the subject invention, an independent latching system is provided in a transmission which in the event of an electrical malfunction automatically latches the transmission in the existing gear. This is accomplished by providing a master latch valve mechanism and a latching shuttle valve to act in cooperation with an electrically controlled proportional valve and a proportional valve that controls engagement of a plurality of hydraulically actuated clutches. When the transmission is operating normally, the master latch valve mechanism directs pressurized fluid from a source of pressurized fluid to urge the latching shuttle valve to an open position. Upon an electrical malfunction, the master latch valve mechanism vents the fluid from the latching shuttle valve thus allowing the latching shuttle valve to block the flow thereacross which forces the proportional valves to hold the actuated clutches in their fully engaged positions.
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Burrows J. W.
Caterpillar Inc.
Wright Dirk
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