Hydraulic system for broadcast spreader
First Claim
Patent Images
1. A hydraulic drive system for a spreader vehicle having an engine, a dispensing mechanism and conveyor means for delivering material to be spread to the dispensing mechanism;
- said system comprising first hydraulic motor means connected with said dispensing mechanism for driving said dispensing mechanism;
second hydraulic motor means connected with said conveyor means for driving said conveyor means;
a variable displacement pressure compensated pump for delivering hydraulic fluid at a variable rate substantially in accordance with demand by said motor means;
hydraulic circuit means connecting said pump and said motor means and including a first hydraulic power line connected to the pump outlet, a first control valve connected to said power line for controlling fluid flow to said first motor means, a second power line in parallel with said first control valve for supplying fluid to said second motor means, and means connected to said second power line and to said pump including control valve means for providing a fluid pressure signal to said pump responsive to fluid flow through said valves for adjusting the pump displacement.
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Abstract
A broadcast spreader having one or more spinners driven by hydraulic motors and a material delivery conveyor or auger driven by a hydraulic motor is provided with a hydraulic system including a flow and pressure-compensated variable displacement pump and pressure-compensated control valves respectively for the spinner and conveyor motors connected so that the volume of fluid delivered by the pump corresponds to the demands of the motors.
18 Citations
9 Claims
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1. A hydraulic drive system for a spreader vehicle having an engine, a dispensing mechanism and conveyor means for delivering material to be spread to the dispensing mechanism;
- said system comprising first hydraulic motor means connected with said dispensing mechanism for driving said dispensing mechanism;
second hydraulic motor means connected with said conveyor means for driving said conveyor means;
a variable displacement pressure compensated pump for delivering hydraulic fluid at a variable rate substantially in accordance with demand by said motor means;
hydraulic circuit means connecting said pump and said motor means and including a first hydraulic power line connected to the pump outlet, a first control valve connected to said power line for controlling fluid flow to said first motor means, a second power line in parallel with said first control valve for supplying fluid to said second motor means, and means connected to said second power line and to said pump including control valve means for providing a fluid pressure signal to said pump responsive to fluid flow through said valves for adjusting the pump displacement. - View Dependent Claims (2, 3, 4, 5, 6, 7)
- said system comprising first hydraulic motor means connected with said dispensing mechanism for driving said dispensing mechanism;
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8. A spreader for dispensing granular material on highways, farms and the like comprising a vehicle having an engine;
- a box on said vehicle for containing a supply of material to be dispensed;
a dispensing mechanism mounted on said vehicle;
a conveyor mounted on said vehicle for delivering materials to be spread from said box to said dispensing mechanism;
a first hydraulic motor connected with said dispensing mechanism for driving said dispensing mechanism;
a second hydraulic motor connected with said conveyor for driving said conveyor;
a variable displacement pressure compensated pump mounted on said vehicle and drivingly connected with said engine for being driven at variable speeds in accordance with engine speed and for delivering hydraulic fluid at variable rates in accordance with demands by said motors;
said pump including a pressurized crankcase having a fluid pressure signal inlet for controlling pump displacement;
hydraulic circuit means connecting said pump and said motors and including a first valve connected with an outlet of said pump for controlling fluid flow to said first motor;
said circuit means also including conduit means extending from a connection by passing said first valve to an inlet of said second motor;
said first valve and said conduit means being in parallel; and
said circuit means including a second valve connected between said conduit means and said crankcase inlet of said pump for controlling fluid flow to said second motor and for providing a fluid pressure signal to said inlet responsive to fluid flow through said valves for adjusting the pump displacement. - View Dependent Claims (9)
- a box on said vehicle for containing a supply of material to be dispensed;
Specification