1996 results about "Hydraulic fluid" patented technology

A brake system includes a reservoir and a motor-driven master cylinder for actuating a plurality of wheel brakes. A secondary power transmission unit provides pressurized hydraulic fluid at first and second PTU outputs for actuating the wheel brakes in at least one of a normal non-failure braking mode and a backup braking mode. The secondary power transmission unit includes an electric PTU motor and at least two pump pistons. At least two brake pressure sensors are provided. Each brake pressure sensor is located directly adjacent a corresponding wheel brake for sensing hydraulic pressure at the corresponding wheel brake and responsively producing a brake pressure signal. An electronic control unit is provided for controlling at least one of the secondary power transmission unit and the master cylinder responsive to at least one brake pressure signal. The secondary power transmission unit is directly fluidly connected to the reservoir.

A brake system includes a master cylinder generating pressure at first and second MC outputs for actuating first and second pairs of wheel brakes. A secondary brake module is configured to provide fluid at first and second PTU outputs for actuating the wheel brakes. The secondary brake module includes an electric motor configured to selectively pressurize the hydraulic fluid by transmitting rotary motion to at least two pump pistons. A pump inlet attenuator is interposed hydraulically between a reservoir and the pump pistons and in direct fluid connection with the reservoir via a single return line. An electronic control unit controls at least one of the secondary brake module and the master cylinder responsive to a brake pressure signal. The pump inlet attenuator regulates pressure in the single return line to reduce pressure fluctuations at an inlet side of each pump piston via solely mechanical pressure attenuation.

A brake system for actuating a plurality of wheel brakes comprising first and second pairs of wheel brakes includes a reservoir and a motor-driven master cylinder operable during a normal non-failure braking mode to generate brake actuating pressure at first and second MC outputs for hydraulically actuating the first and second pairs of wheel brakes. A secondary power transmission unit is configured for selectively providing pressurized hydraulic fluid at first and second PTU outputs and includes an electric PTU motor configured to selectively pressurize the hydraulic fluid by transmitting rotary motion to at least two pump pistons. The secondary power transmission unit is indirectly fluidly connected to the reservoir to selectively draw hydraulic fluid therefrom.

A brake system includes a motor-driven master cylinder for generating brake actuating pressure at first and second MC outputs for hydraulically actuating pairs of wheel brakes. A secondary brake module is configured for selectively providing pressurized hydraulic fluid at first and second PTU outputs for actuating the first and second pairs of wheel brakes. A low pressure accumulator is interposed hydraulically between the first and second pairs of wheel brakes. The low pressure accumulator is in indirect fluid communication with the reservoir via the first and second MC outputs and the master cylinder. The low pressure accumulator at least partially provides slip control to the wheel brakes in coordination with the secondary brake module when the brake system is in the normal non-failure braking mode.

A hydraulic valve includes two ports, a chamber within the valve housing which, in operation, is at least partially filled with a hydraulic fluid, and a fluid switch within the chamber. The fluid switch is movable between at least a first position and a second position. In the first position, the ports are fluidly coupled to each other. In the second position, the ports are fluidly isolated from each other. An external surface of the fluid switch is separated from an internal surface of the chamber by a first micro-gap. Another external surface of the fluid switch is separated from another internal surface of the chamber by a second micro-gap. The first micro-gap and the second micro-gap are fluidly coupled to the chamber, and each have a respective size of less than about five micrometers.

Heat exchangers for cryogenic fuel distribution systems and related methods are disclosed herein. An example aircraft disclosed herein includes a cryogenic fuel system including a cryogenic fuel, a hydraulic system including a hydraulic fluid, a gas turbine engine fluidly coupled to the cryogenic fuel system, and a heat exchanger fluidly coupled to the cryogenic fuel system, the heat exchanger is used to exchange heat between the cryogenic fuel and at least one of (1) hydraulic fluid or (2) working fluid thermally coupled to the hydraulic system.

A brake system includes a reservoir and first and second motor-driven master cylinders. An electronic control unit is provided for controlling at least one of the first and second master cylinders responsive to at least one brake pressure signal. A secondary power transmission unit is configured for selectively providing pressurized hydraulic fluid at first and second PTU outputs for actuating first and second pairs of wheel brakes in at least one of a normal non-failure braking mode and a backup braking mode. Each of the first and second PTU outputs provides fluid to a corresponding one of the first and second pairs of wheel brakes. The secondary power transmission unit is directly fluidly connected to the reservoir.

An immersion cooling system includes a work tank, a buffer tank, and a communication control assembly. The work tank has a work-tank gas-phase region and a work-tank liquid-phase region. The buffer tank has a buffer-tank gas-phase region and a buffer-tank liquid-phase region. The communication control assembly includes a first pipeline, a first pump, a second pipeline, and a second valve. In response to that the first pump is actuated, through the first pipeline, a fluid of the work-tank liquid-phase region is transported to the buffer-tank liquid-phase region, or a fluid of the buffer-tank liquid-phase region is transported to the work-tank liquid-phase region. In response to that the second valve is actuated, through the second pipeline, the work-tank gas-phase region is selectively in communication with the buffer-tank gas-phase region.

A hydraulic vibration generation device or hydraulic motor is provided. The device includes a manifold having an inner volume with a pressure chamber extending into the inner volume, a fluid inlet orifice and a fluid outlet orifice. The device further includes a vibration generating member having a grooved drive and an off-center weight and retaining plates. The inner volume receives the vibration generating member within the inner volume. The vibration generating member rotates and generates vibration in response to hydraulic fluid flowing into the manifold through the inlet orifice and directed through the pressure chamber, relieves pressure upon exiting the pressure chamber and out of the manifold through the outlet orifice. Also provided a hydraulic motor with a same manifold and pressure chamber, but with a power generating member having the same groove drive without and off-center weight. Rotation of the power generating member generates power.

Hydraulic damper(1000) for furniture doors or drawers. Damper(1000) comprises housing(1) having a closed first end(14) and a second end provided with lid(7); and piston(2) movable in housing(1) along longitudinal piston axis(A). Piston(2) defines first and second chambers(11,12) inside housing(1), respectively at first and second end-sides of piston(2). Piston(2) comprises circumferential groove(24) defined between circumferential first and second shoulders(241,242). Groove(24) is provided with annular collar(5) axially movable between first and second shoulders(241,242). Collar(5) is formed from elastic material to reversibly contact inner surface(13) of housing(1) when radially expanded when subjected to hydraulic-pressure forces parallel to axis(A). First shoulder(241) is arranged allowing hydraulic fluid to flow on collar(5) when collar(5) contacts first shoulder(241). Second shoulder(242) is arranged blocking hydraulic fluid from flowing on collar(5) when collar(5) contacts second shoulder(242). Piston(2) is provided with channel(21) arranged to provide fluid flow communication between first and second chambers(11,12).

A brake system includes a source of pressurized hydraulic fluid, a plurality of wheel brakes, and an iso / dump control valve arrangement associated with at least one wheel brake. A reservoir is connected to the source of pressurized fluid and to the iso / dump control valve arrangement. A fast-replenishing circuit includes a FR iso valve, a venting valve, and a replenishing check valve. The venting and replenishing check valves are interposed between the source of pressurized fluid and the reservoir. The FR iso valve is interposed between the source of pressurized fluid and the iso / dump control valve arrangement. When the source of pressurized fluid reaches a predetermined stroke position, the FR iso valve is energized to restrict movement of fluid from at least one iso / dump control valve arrangement to the source of pressurized fluid. The source of pressurized fluid is re-stroked to draw fluid from the reservoir through the replenishing check valve.

The invention discloses a universal multifunctional obstacle crossing vehicle body system for a deep-sea mining vehicle. The universal multifunctional obstacle crossing vehicle body system comprises a main vehicle frame, a hydraulic suspension system and an independent driving system. The hydraulic suspension system comprises a main supporting hydraulic push rod, an upper vehicle body and lower vehicle body connecting frame, an L-shaped driving system connecting frame, hydraulic steering push rods on the two sides, a steering wheel, a steering wheel bottom fixing piece, a spherical higher pair connecting shaft, a driving system universal connector and a corresponding hydraulic control loop. The independent driving system comprises a track system, a box body, a pitching hydraulic motor, a driving motor, an auxiliary bearing wheel and an auxiliary tensioning wheel set. Compared with a traditional crawler-type chassis, the universal obstacle crossing chassis provided by the invention has better obstacle crossing ability and flexibility, and can cope with more complex seabed conditions. And meanwhile, the universal chassis can adapt to different types of working environments by replacing different types of independent driving modules, so that the universal chassis has excellent multi-terrain adaptability. By means of the universal vehicle chassis, the passing rate and the working efficiency of various deep-sea mining devices in the complex seabed environment can be well improved.

A hydraulic vibration generation device or hydraulic motor is provided. The device includes a manifold having an inner volume with a pressure chamber formed in the inner volume, a fluid inlet orifice and a fluid outlet orifice. The device further includes a vibration generating member having a grooved drive and an off-center weight and retaining plates. The inner volume receives the vibration generating member within it. The vibration generating member rotates and generates vibration in response to hydraulic fluid flowing into the manifold through the inlet orifice and directed through the pressure chamber, relieves pressure upon exiting the pressure chamber into a pressure relief channel and out of the manifold through the outlet orifice. Also provided a hydraulic motor with a same manifold and pressure chamber, but with a power generating member having the same groove drive without an off-center weight. Rotation of the power generating member generates power.

An apparatus for operating a load-controlled hydraulic supply of an agricultural tractor includes a hydraulic pump which is adjustable with respect to the displacement volume for supplying pressurized hydraulic fluid, a proportional valve which is electrically actuatable, a primary hydraulic consumer to carry out a superordinate hydraulic function and to be directly connected to a conveying outlet of the hydraulic pump, a secondary hydraulic consumer to carry out a subordinate hydraulic function and to be connected to the conveying outlet of the hydraulic pump via the proportional valve, and a control unit configured to move the proportional valve into a closed valve position when the control unit recognizes that at least one of a required power of the primary and secondary hydraulic consumers exceeds the conveying capacity of the hydraulic pump and the subordinate hydraulic function of the secondary hydraulic consumer is inactive.

A grounds maintenance vehicle is disclosed. A vehicle frame extends between a first end and a second end in a longitudinal direction. A prime mover is coupled to the vehicle frame. A hydraulic pump assembly is coupled to the vehicle frame, where the hydraulic pump assembly is in mechanical communication with the prime mover. A hydraulic fluid line has a first end and a second end. The first end is fluidly coupled to the hydraulic pump assembly. A drive wheel motor is fluidly coupled to the second end of the hydraulic fluid line. The first end of the hydraulic fluid line extends longitudinally outward from the hydraulic pump assembly in a direction away from the prime mover.

A hydraulic pump system includes a housing defining a tank for containing hydraulic fluid in use; a pump for supplying hydraulic fluid from the tank to a hydraulic system; an electric motor for driving the pump, wherein the electric motor is mounted on the housing; and a fan configured to cool the electric motor.

The invention relates to the technical field of intelligent control of heavy equipment, in particular to a hydraulic synchronous intelligent control system for segmented turnover of an overweight steel structure, and discloses the hydraulic synchronous intelligent control system for segmented turnover of the overweight steel structure. According to the system, full-field strain data of a structure surface is acquired by deploying a flexible grid sensor array, and a deformation gradient topological graph is constructed to identify an instability risk area. And a dynamic fluid network model of the hydraulic system is established, fluid-solid coupling simulation is carried out in combination with deformation characteristics, and pressure pulsation transmission paths under different control instructions are predicted. And the system dynamically optimizes a data sampling strategy and network model parameters according to a prediction path, generates a hydraulic cylinder coordination action instruction subjected to pressure balance verification, and finally drives an execution mechanism to complete turnover operation. According to the scheme, full-field real-time sensing of structural deformation and dynamic coupling prediction control of hydraulic fluid are achieved, and the safety and control precision of the overweight component in the turnover process are improved.

A method for grouping hydraulic functions associated with an agricultural implement includes accessing parameter data associated with hydraulic fluid used to drive a plurality of hydraulic functions of the implement, the hydraulic fluid being supplied from one of at least two pumps. The method also includes determining delivery pump pressures for the pumps for each of a plurality of different pump / function combinations based at least in part on the hydraulic parameter data and determining a power parameter requirement for the pumps for each of the different pump / function combinations based at least in part on the delivery pump pressures. In addition, the method includes selecting a desired pump / function combination based at least in part on the power parameter requirement; and controlling an operation of a plurality of switching valves such that the hydraulic fluid is supplied for driving the hydraulic functions in accordance with the desired pump / function combination.

The invention discloses an auxiliary braking device for a vertical lifting type gate, and belongs to the technical field of vertical lifting type gates. The vertical lifting type gate is arranged in the gate groove in a lifting mode, and the auxiliary braking device comprises a hydraulic separating type crane, a hydraulic separating type crane and a hydraulic separating type crane, and the hydraulic separating type crane is configured to be capable of applying transverse pressure to the vertical lifting type gate so that the vertical lifting type gate can abut against and be fixed to the gate groove; the electric pump is connected to the liquid inlet of the hydraulic separation type crane and is configured to supply hydraulic fluid to the liquid inlet of the hydraulic separation type crane by hydraulic pressure; the regulating valve is arranged on a pipeline for connecting a liquid inlet of the hydraulic separating crane and an outlet of the electric pump; the auxiliary braking device is configured to adjust the pressure level of hydraulic fluid in the hydraulic separating type crane by adjusting the opening degree of the adjusting valve so as to adjust the transverse pressure.

A method for filling a hydraulic circuit of an electro-hydrostatic system includes connecting first and third shut-off valves to a discharge valve, and connecting a second shut-off valve to a filling valve, while the second and third shut-off valves are closed, opening the filling valve, the discharge valve and the first shut-off valve and operating a vacuum generator, once a vacuum has been established in the hydraulic circuit, opening the second shut-off valve in order to fill the hydraulic circuit with pressurized hydraulic fluid while the vacuum generator is still in operation, once the hydraulic circuit has been filled with fluid, closing the first shut-off valve and then opening the third shut-off valve in order to bypass the vacuum generator and circulate the fluid through the electro-hydrostatic system until the fluid contained in the hydraulic circuit reaches a predetermined pressure, and closing the discharge valve and the filling valve.

A shock absorber body assembly is disclosed that is includes a shock body formed of a cylinder defining a top cylinder end and a bottom cylinder end, and having a cylinder wall that surrounds a cylinder cavity. The cylinder wall is defined by a solid interior portion and a raised cooling pattern disposed on and proud of an exterior side of cylinder wall. The raised cooling pattern is comprised of one or more fins, wherein the raised cooling pattern is configured to provide for heat transfer from hydraulic fluid within the cavity of the cylinder cavity to an environment external to the shock absorber body assembly. The raised cooling pattern includes one or more cooling fins that extend along a length of the cylinder in a straight line and extend outwardly from the cylinder wall in an orthogonal direction, a cooling lattice mesh, or a cooling gyroid mesh.

A firearm support includes a housing, two or more legs, a column, a firearm mount, and a remote actuator. The housing including a first hydraulic cylinder. The two or more legs are pivotally coupled to and extending from the housing. The column resides at least partially within the first hydraulic cylinder. The firearm mount supports a firearm and is attached to a distal end of the column opposite the first hydraulic cylinder. The remote actuator is fluidly coupled to the first hydraulic cylinder through a hydraulic hose. The remote actuator adjusts a height of the column by moving hydraulic fluid through the hydraulic hose in response to rotation of a height adjustment knob on the remote actuator.

The present invention makes it possible to, in a configuration provided with electrical components such as an inverter device for controlling an electric motor, obtain a high degree of freedom with regard to the layout of the electrical components and efficiently place the electrical components in a limited space. An excavator comprises: an electric motor; a hydraulic fluid tank in which hydraulic fluid is stored; a hydraulic pump that is driven by the electric motor and supplies the hydraulic fluid within the hydraulic fluid tank to an actuator; and an inverter device that, with respect to the hydraulic fluid tank, is provided at a position away from a left-side surface part of the hydraulic fluid tank.

A downhole tool and method, of which the downhole tool includes a housing defining a charge chamber and a hydraulic chamber, the hydraulic chamber containing a hydraulic fluid, and a piston disposed in the hydraulic chamber. The piston prevents the hydraulic fluid from communicating with the charge chamber, and is in communication with the hydraulic fluid and the charge chamber. The tool also includes one or more charges disposed in the charge chamber. The one or more charges are configured to ignite and thereby expand a gas in the charge chamber. The tool further includes a fluid-metering device coupled to the housing. The fluid-metering device is configured to control a rate at which the hydraulic fluid is pressed out of the hydraulic chamber.

A hydraulic system includes a prime mover, a variable displacement first hydraulic pump to be driven by the prime mover to deliver hydraulic fluid, a first hydraulic actuator to be driven by fluid delivered by the first hydraulic pump, a variable displacement second hydraulic pump to be driven by the prime mover to deliver hydraulic fluid, a second hydraulic actuator to be driven by fluid delivered by the second hydraulic pump, and first and second restrictors configured or programmed to restrict an output of the respective first and second hydraulic pumps based on a load on the prime mover. The first restrictor is configured or programmed to change an output restriction of the first hydraulic pump based on priority information about the first and second hydraulic actuators and / or the second restrictor is configured or programmed to change an output restriction of the second hydraulic pump based on the priority information.

The present invention obtains a hydraulic pressure control unit capable of accurately evaluating viscosity of a hydraulic fluid.The hydraulic pressure control unit according to the present invention includes a controller including an evaluation section that evaluates the viscosity of the hydraulic fluid. The evaluation section evaluates the viscosity on the basis of a reduced amount of a current value of a current flowing through a wire (314) at a time when the current value is temporarily reduced in a process in which the current value is increased toward a target current value at beginning of application of the current to the wire (314) of an electromagnetic valve (31).

A lift-propulsion assembly and a watercraft. The watercraft includes a buoyant body having upper and lower surfaces on respective upper and lower sides thereof; a lift-propulsion system including a mast connected to the buoyant body, the mast having a proximal end and a distal end, the mast extending from the lower side of the buoyant body; and the lift-propulsion assembly. The assembly includes an assembly frame connected to the distal end of the mast; a propulsion unit for providing thrust to the watercraft, the propulsion unit being connected to the assembly frame; a hydrofoil for providing lift to the watercraft, the hydrofoil being selectively connected to the assembly frame; and a manually-operable attachment system connecting the hydrofoil to the assembly frame.

The invention discloses a control handle of a photography support frame, which is used for unlocking or locking a support leg locking assembly of the photography support frame, and comprises a handle shell, a support leg locking assembly, a support leg locking assembly and a support leg locking assembly, the hydraulic cylinder is arranged in the handle shell, the hydraulic cylinder comprises a cylinder body and a first piston, the cylinder body is provided with a hydraulic cavity for storing hydraulic fluid and an overflowing hole which is communicated with the hydraulic cavity and can allow the hydraulic fluid to enter and exit from the hydraulic cavity, and the overflowing hole is used for being communicated with the supporting leg locking assembly; the first piston is arranged in the hydraulic cavity in a sliding mode and used for squeezing out hydraulic fluid in the hydraulic cavity from the overflowing hole or pumping the hydraulic fluid back to the hydraulic cavity. The hydraulic handle is adopted as the control handle, and compared with an existing electric control handle, charging is not needed, so that equipment such as a charger and a mobile power source does not need to be additionally carried, the carrying burden is reduced, and use is convenient.

Methods and systems for detecting a torque transmission failure in an aircraft power plant are provided. The system comprises a hydrostatic transmission for transmitting torque between a first shaft and a second shaft using hydraulic fluid, an a failure detector including a sensor configured to detect a pressure change in the hydraulic fluid. The failure detector is configured to generate an output indicative of the torque transmission failure in response to the pressure change having crossed a threshold.

The invention relates to the technical field of shield tunneling machine disassembly, and particularly discloses a modular disassembly, disassembly tool and method for a shield tunneling machine in a tunnel. The tool comprises a tool body, the tool body comprises an upper mounting frame and a lower mounting frame, and a support is arranged between the upper mounting frame and the lower mounting frame; two lifting plates are arranged on the upper mounting frame, and through holes are formed in the lifting plates; rollers are arranged at one end of the lower mounting rack away from the hoisting section; the tool can improve the dismounting efficiency; the method comprises the steps that S1, the water stop hoop is poured; s2, dismounting the cutter head; s3, propelling, and dismounting a hinged oil cylinder; s4, the duct piece trolley is disassembled; s5, the shield tunneling machine is electrically disassembled; s6, disassembling a hydraulic fluid pipeline; s7, the spiral conveyor is dismantled; s8, the segment erector is disassembled and transported; s9, dismounting and transporting the *-shaped beam; s10, dismounting and transporting a main driving speed reducer and a motor; s11, the man bin is dismantled; s12, disassembling the main drive; the construction method can help to ensure the smooth implementation of the dismounting process and improve the construction efficiency.