Combine hydraulic valve

Claim 2

In combination in a self-propelled combine harvester having a control console positioned at an operator''s station, said combine being provided with a hydraulic system including a pump and a sump, the improvement comprising: a double acting hydraulic cylinder, a hydraulic manifold having a main passage connected in fluid receiving relation to said pump and in fluid delivery relation to said sump and having a pair of supply passages operatively connecting opposite ends of said cylinder to said main passage, said manifold being positioned in remote relation to said console and proximate to said pump and sump to provide a minimum passage of hydraulic fluid between said pump and sump when said hydraulic cylinder is not being operated, a normally open solenoid valve mounted on said manifold and connected to said main passage, said normally open solenoid valve having An open position permitting hydraulic fluid to pass from said main passage to said sump and a closed position blocking fluid from flowing from said main passage to said sump, a first pair of normally closed solenoid valves mounted on said manifold and connected respectively in controlling relation to said supply passages, said first pair of normally closed solenoid valves opening when energized to permit fluid flow in said supply passages, respectively, between said main passage to said cylinder, said first pair of normally closed solenoid valves being operative when not energized to prevent flow of fluid through said supply passages from said cylinder to said main passage, a second pair of normally closed solenoid valves connected respectively to said supply passages and operable to control flow of fluid therefrom to said sump, said second pair of normally closed solenoid valves when opened being operative to pass fluid from said cylinder to said sump without it passing through said main passage, and a plurality of switches positioned in said control console for controlling said solenoid valves and so connected to the latter whereby upon closing of selected switches on said console said normally open solenoid valve will be closed permitting buildup of hydraulic pressure in said main passage and upon subsequently opening one of said first pair of normally closed solenoid valves associated with one of said supply passages and opening the one of said second pair of normally closed solenoid valves associated with the other of said supply passages, fluid is delivered to one end of said cylinder and exhausted from the other.

Claim 3

In combination in a self-propelled combine harvester having a control console positioned at an operator''s station, said combine being provided with a hydraulic system including a pump, a sump and a plurality of hydraulically operated devices including a hydraulic motor, the improvement comprising: a hydraulic manifold having a main passage connected in fluid receiving relation to said pump and in fluid delivery relation to said sump and a motor passage connected at one end to said main passage and having its other end connected to said motor, a normally open solenoid valve mounted on said manifold connected in controlling relation to said main passage, said normally open solenoid valve having an open position permitting hydraulic fluid to pass from said pump to said sump by way of said main passage and a closed position blocking fluid from flowing from said pump to said sump by way of said main passage, a first normally closed solenoid valve mounted on said manifold and connected in controlling relation to said motor passage, said first normally closed solenoid valve functioning when not energized as a check valve preventing return flow from said motor through said motor passage and opening when energized to permit fluid flow in said motor passage between said main passage and said motor, a first relief valve operatively connected to the output side of said pump to establish a relatively high operating pressure for said main passage of said manifold when said normally open solenoid valve is closed, a second normally closed solenoid valve interconnected between said motor passage and said sump and including a spring biased valve plunger operating as a second relief valve when said second valve is not energized, said second valve establishing a lower operating pressure for said motor passage than that established for said main passage by said first relief valve, and a plurality of switches positioned in said control console for controlling said solenoid valves and connected to the latter whereby upon closing of selected switches on said console said first normally open solenoid valve will be closed permitting buildup of hydraulic pressure in said main passage and upon subsequently opening said normally closed solenoid valve pressurized hydraulic fluid is supplied through said normally closed solenoiD valve and said motor passage to said one hydraulic motor causing said motor to be operated in one direction, and fluid being permitted to flow to sump from said motor by way of said motor passage without passing through said main passage when a selected switch in said control console is operated to energize said second normally closed solenoid valve thereby causing the latter to open.

Claim 4

In combination in a self-propelled combine harvester having a control console positioned at an operator''s station, said combine being provided with a hydraulic system including a pump, a sump and a plurality of hydraulically operated devices including a hydraulic motor, the improvement comprising: a hydraulic manifold having a main passage connected in fluid receiving relation to said pump and in fluid delivery relation to said sump and a motor passage connected at one end to said main passage and having its other end connected to said motor, a normally open solenoid valve mounted on said manifold connected in controlling relation to said main passage, said normally open solenoid valve having an open position permitting hydraulic fluid to pass from said pump to said sump by way of said main passage and a closed position blocking fluid from flowing from said pump to said sump by way of said main passage, a first normally closed solenoid valve mounted on said manifold and connected in controlling relation to said motor passage, said first normally closed solenoid valve functioning when not energized as a check valve preventing return flow from said motor through said motor passage and opening when energized to permit fluid flow in said motor passage between said main passage and said motor, a first relief valve operatively connected to the output side of said pump to establish a relatively high operating pressure for said main passage of said manifold when said normally open solenoid valve is closed, a second normally closed solenoid valve interconnected between said motor passage and said sump and including a spring biased valve plunger operating as a second relief valve when said second valve is not energized, said second valve establishing a lower operating pressure for said motor passage than that established for said main passage by said first relief valve, and a plurality of switches positioned in said control console for controlling said solenoid valves and connected to the latter whereby upon closing of selected switches on said console said first normally open solenoid valve will be closed permitting buildup of hydraulic pressure in said main passage and upon subsequently opening said normally closed solenoid valve pressurized hydraulic fluid is supplied through said normally closed solenoiD valve and said motor passage to said one hydraulic motor causing said motor to be operated in one direction, and fluid being permitted to flow to sump from said motor by way of said motor passage without passing through said main passage when a selected switch in said control console is operated to energize said second normally closed solenoid valve thereby causing the latter to open.