Caterpillar Inc.

Caterpillar Sarl

Caterpillar Global Mining LLC

Michael P Chiaramonte

Christopher J Demick

Brett J Janson

Christopher Alan Williamson

Sean Johnson

Justin Ayers

Philip F Lange

Robert Stone

Russell L Stott

A hydraulic circuit may be used for controlling a plurality of hydraulic implements. The hydraulic circuit may include a first directional valve, a second directional valve, and a relief valve. A variable displacement pump may be fluidly coupled to the first directional valve, the second directional valve, and the relief valve. The hydraulic circuit may be communicably and operably coupled to a controller, and the controller may be programmed to selectably control the hydraulic circuit between a first operational mode and a second operational mode. Additionally, the controller may be programmed to actuate the first directional valve between an open position and a closed position and to actuate the second directional valve between a first open position, a second open position, a first closed position and a second closed position.

Dual pressure logic for a track drill circuit

A hydraulic circuit for controlling a component of a hydraulic machine includes an actuator having a head end chamber and a rod end chamber, the actuator having an extended position for moving the component in a first direction and a retracted position for moving the component in a second direction. The hydraulic circuit includes a regeneration valve having an open position for fluidly connecting the head end chamber to the rod end chamber, a first control valve having a first open position, a second open position for fluidly connecting the regeneration valve to the return tank and substantially fluidly disconnecting the rod end chamber from the fluid source, and a closed position, and a second control valve having a first open position, a second open position, and a closed position for substantially fluidly disconnecting the rod end chamber from the fluid source.

Hydraulic control circuit with regeneration valve

A fan drive system includes a pump, at least one implement arrangement in fluid communication with the pump and a fan drive unit driveably connected to the pump. The fan drive unit is in fluid communication with the pump through a modulation valve. A signal operator is structured and arranged to receive at least one implement signal and a fan drive signal and generate a load signal output, wherein the pump is adapted to modify an output flow of the pump in response to the load signal. A control valve is urged to respond under the influence of a sensed condition and is in fluid communication with the modulation valve and the signal operator through a signal conduit.

Hydraulic fan drive system

A snubbing arrangement functions to control the rate of deceleration of a piston and rod assembly within a fluid cylinder as the piston and rod assembly nears the bottom of the piston cavity. A flow blocking mechanism is attached to the piston and rod assembly and acts to block flow from the piston cavity through a first head end port. A pressure differential valve mechanism is disposed between a second head end port and the rod end port and operative to control the pressure in the head end cavity relative to the pressure in the rod end cavity.

Snubbing arrangement for a fluid cylinder assembly

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Cary, NC, United States of America

Michael P Chiaramonte