Patent ID: 9038492
Filing Date: 2015-05-26
Classification: F16H,Y10T

Abstract:
1. A hydraulic arrangement by which a plurality of shift rails of a transmission are controllable, said hydraulic arrangement comprising: a source of hydraulic energy; a plurality of double acting cylinders connected with respective ones of a plurality of shift rails, by which cylinders respective ones of the shift rails are moved back and forth; a first hydraulic valve connected with the source of hydraulic energy and upstream of the plurality of double acting cylinders, wherein the first hydraulic valve includes a first inlet and a second inlet and a first outlet and a second outlet, through which first and second outlets a first shifting pressure and a second shifting pressure are selectively provided from the source of hydraulic energy to respective operating surfaces of the double acting cylinders for initiating movement of respective ones of the shift rails in a desired direction, wherein the first hydraulic valve includes a plurality of shifting positions, and at one shifting position the first hydraulic valve includes an internal crossover pattern between the first and second inlets and the first and second outlets; a second hydraulic valve connected between the first hydraulic valve and a first pair of the double acting cylinders for selectively moving respective ones of a first pair of shift rails, by which second hydraulic valve a first one of the first pair of double acting cylinders connected with a first one of the first pair of shift rails is connected with the first outlet of the first hydraulic valve, and a second one of the first pair of double acting cylinders and connected with a second one of the first pair of shift rails is connected with the second outlet of the first hydraulic valve in a crossover pattern, wherein the crossover pattern is provided internally within the second hydraulic valve; wherein the first and second hydraulic valves are three-position, four-way directional control valves.