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US 2003/0198559 A1Published application
Fluid system
AssigneeWayne Engineering Corporation
InventorWayne R. Worthington
Life of this patent
Estimating the term…
Abstract
A fluid system for plural motor driven pumps is disclosed. The fluid system includes a control valve which provides for unloading one or more pumps by diverting the flow of operating fluid from the pump back to the reservoir whenever the load pressure or the motor speed exceeds pre-selected levels.
Claims20
A fluid system for use on a refuse truck and including a hydraulic motor;
- a fluid reservoir;
- a plurality of fixed displacement pumps;
- drive means operatively connected to the fixed displacement pumps for driving the same;
- a control valve for selectively directing a flow of fluid to either the reservoir or the hydraulic motor;
- and a control system having means for determining an external condition and generating a corresponding signal, and means responsive to the signal for switching the control valve.
2 more elements
A fluid system for use on a refuse truck and comprising:
- a first fixed displacement pump, a second fixed displacement pump that has a larger displacement than the first fixed displacement pump, and a third displacement pump, wherein the first fixed displacement pump, the second fixed displacement pump and the third fixed displacement pump are selectively turned “on” and “off” in response to a signal means, wherein said signal means is external to the fluid system;
- a drive means operatively connected to the first fixed displacement pump, the second fixed displacement pump, and the third fixed displacement pump;
- a first control valve operatively connected to the first fixed displacement pump and the second fixed displacement pump;
- a second control valve operatively connected to the third fixed displacement pump;
- a first function valve operatively connected to the first control valve;
- a second function valve operatively connected to the second control valve;
- a first hydraulic motor operatively connected to the first function valve;
- a second hydraulic motor operatively connected to the second function valve;
- and
- an electrical circuit that receives the signal means and communicates with the first control valve, the second control valve, the first function valve, and the second function valve.
7 more elements
A fluid system for use on a refuse truck and including a hydraulic motor;
- a fluid reservoir;
- a plurality of fixed displacement pumps;
- drive means operatively connected to the fixed displacement pumps for driving the same;
- a control valve for selectively directing a flow of fluid to either the reservoir or the hydraulic motor;
- and a control system having means for determining an external condition and an internal condition, generating a corresponding signal for each condition, and means responsive to the signals for switching the control valve.
2 more elements
Dependencies are inferred from the claim text.