Case Corporation

Cnh America LLC

Cnh Industrial America LLC

Cnh Industrial Italia S.p.a.

Richard J Lech

Dennis J Heyne

Eric Sharkness

Roger D Mickelson

Matthew J Hennemann

Robert E Wawiorka

Alan D Berger

Guy T Stoever

Garrett L Anderson

Larry A Johnson

Robert T Peterson

David W Swaim

Curtis R Lyons

Michael G Nahorny

C David Anderson

Patrick J Pieper

Ian MacLeod

Danley C K Chan

Vlad Petru Patrangenaru

Richard A Atkins

Garrett Anderson

David C Anderson

A fluid control system including a variable displacement pump having a load system control and configured to operate in an open center mode. A pump control is operable between a first arrangement and a second arrangement. The pump control receives pressurized fluid from a first load sensor pressure in fluid communication with the pump and an actuator return pressure in fluid communication with an actuator configured to operate using pressurized fluid from the system, the pump control providing a selective pump control pressure to the pump load system control. When the system is operating in a standby mode, the pump operates in a first minimized displacement condition. When the system is in a stall mode, the pump operates in a second minimized displacement condition.

Fluid control system for work vehicle

An open center hydraulic system that includes a variable displacement pump having an inlet, an outlet and a sensing port, the pump configured to provide reduced fluid flow in response to a predetermined fluid pressure differential between the outlet and the sensing port. A first fluid circuit and a second fluid circuit each serve as signal lines with the pump sensing port. During operation of the second fluid circuit, reduced fluid flow from the pump outlet is achieved as a result of the sum of induced fluid pressure reductions of respective controlled pressure reduction devices approaching the predetermined pump fluid pressure differential.

Open center hydraulic system

The present invention is directed to a control circuit for automatically bringing a hydraulically operated work arm into a particular position without having to manually reverse the direction of the hydraulic operating system.

Automatic over-center system

A multiple-speed steering system for an off-road vehicle having a loading mechanism and a hydraulic steering system associated with guiding the vehicle. The multiple-speed steering system includes a hydraulic steering cylinder and a first component fluidly coupled to the steering cylinder to provide a primary metered flow of hydraulic fluid to the steering cylinder. A second component is selectively fluidly coupled to the steering cylinder to provide a supplemental metered flow in addition to the primary metered flow of hydraulic fluid to the steering cylinder. Addition of the supplemental metered flow is selectable by an operator of the vehicle.

Multiple ratio steering for loader

A system is used with a boom pivoted on a frame about a horizontal pivot axis between raised and lowered positions by a first fluid ram joining the frame and the boom. A releasable locking mechanism locks the boom relative to the frame to prevent pivotal movement of the boom about its horizontal pivot axis. A second fluid ram is disposed between the frame and the boom, the second fluid ram compressed between the frame and the boom when the boom is adjacent the raised position, but prior to the boom achieving a latched position substantially coinciding with the raised position. A fluid circuit of the second fluid ram has two selectable pressure levels. The first level substantially prevents the boom from achieving the latched position, the second level permits the boom to achieve the latched position while providing fluid cushioning to dissipate impact forces between the boom and frame.

Hydraulically cushioned backhoe boom bumper and travel limiter

A hybrid hydraulic system for a work vehicle is provided that includes a first fixed displacement hydraulic pump whose outlet is connected to a priority valve. The priority valve, in turn, directs the pump's flow to a first group of closed center backhoe valves on a primary circuit and a second group of open center loader valves on a secondary circuit. A second hydraulic pump is provided with independent load sensing capability to supplement fluid flow provided by the first pump.

Work vehicle hydraulic system

An electronic control for damping oscillation of a swinging backhoe assembly includes a crossover valve that connects the hydraulic lines that supply hydraulic fluid to the boom swing cylinders to each other whenever an electronic controller senses incipient oscillation or swinging of the backhoe assembly. The electronic controller senses such parameters as pressure in the conduits and the position of the operator controls or the position of the boom swing control valve that the operator controls to determine incipient oscillation when the backhoe assembly is stopped. The crossover valve may remain open for a predetermined period of time.

Method of controlling a backhoe

Electronic control for swing damping

Hydraulic swing damping system

The invention provides a system for regulating pressure equalization in hydraulic mechanisms to suppress oscillation in heavy equipment. The system includes a first and second hydraulic lines, a crossover valve in communication with each of the first and second hydraulic lines, a timing system in communication with the crossover valve, and a motion detector in communication with a heavy equipment component. The motion detector senses a linkage motion and operatively opens the crossover valve, which remains open as directed by the timing system.

Hydraulic system for suppressing oscillation in heavy equipment

A method for retrofitting a swing damping circuit to a work vehicle such as a backhoe includes disconnecting a boom swing valve from a boom swing cylinder, and coupling the swing damping circuit to the boom swing valve. Alternatively, it may include replacing a boom swing valve with a combined boom swing valve and swing damping circuit that form a unitary valve body.

Method for retrofitting a swing damping valve circuit to a work vehicle

A system for damping incipient oscillation in a linkage such as a backhoe assembly includes a crossover valve that connects the two supply lines that provide hydraulic fluid to a linkage actuator such as a boom swing hydraulic cylinder. The crossover valve is configured to open in response to the deceleration of the backhoe assembly.

System for reducing boom swing oscillation in a backhoe assembly

Hydraulic system and method for regulating pressure equalization to suppress oscillation in heavy equipment

An apparatus for adjusting the ride of a load carrying vehicle is disclosed. The apparatus includes a sensor, a controller, and an adjustable accumulator assembly. The sensor measures a load on a load holding hydraulic circuit. The controller is operatively connected to the adjustable accumulator assembly. The controller is capable of adjusting the precharge pressure in the accumulator in response to the load measured by the sensor.

Ride control apparatus and method

A work vehicle is disclosed, the vehicle including first and second hydraulic circuits provided with first and second fluids, wherein the fluids are to be is kept apart; at least one fluid cooler for cooling at least one of the fluids; and a means for transferring heat from the hotter fluid to the cooler fluid. Also disclosed is a fluid cooling apparatus for a work vehicle, the work vehicle including a transmission with a first fluid and a hydraulic circuit with a second fluid. The cooling apparatus includes at least one fluid cooler for cooling at least one of the fluids, and an apparatus for transferring heat from the hotter fluid to the other fluid. Also disclosed is a method of cooling fluids of a work vehicle provided with a first hydraulic circuit including a first fluid and a second hydraulic circuit including a second fluid, the fluids to be kept separate. At least one of the hydraulic circuits includes a fluid cooler and a pump. The vehicle is further provided with a heat transfer apparatus for transferring heat from the hotter fluid to the other fluid. The method includes steps of pumping the first or second fluid through the fluid cooler, and pumping the first or second fluid through the heat transfer apparatus.

Growing community of inventors

Burlington, IA, United States of America

Richard J Lech