635 results about "Hydraulic fluid" patented technology

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 working vehicle includes an electric storage device; a traction motor configured to propel the working vehicle and to generate electrical energy when braking; a hydraulic system including a hydraulic pump driven by a load motor, a hydraulic actuator and a control valve; and a control system. The control system is configured to determine a state of charge of the electric storage device; induce additional load on the hydraulic system by directing the load motor to drive the hydraulic pump and actuating the control valve to direct flow of hydraulic fluid to the hydraulic actuator when the state of charge is at or above a predetermined threshold.

An agricultural crop conditioner comprising: a frame; first and second conditioner rolls with the second conditioner roll being movable towards and away from the first conditioner roll to change a size of a gap between the rolls; a tensioner configured to generate closing force component to bias the second conditioner roll in the closing direction; a conditioner roll drive circuit; and a hydraulic actuator. The conditioner roll drive circuit has a hydraulic pump and motor to drive at least one of the conditioner rolls. The hydraulic actuator is configured to convert pressure from hydraulic fluid in the reverse supply line into an opening force to bias the second conditioner roll away from the first conditioner roll. The opening force is less than the closing force when the pump is operated in a forward direction, and greater than the closing force when the pump is operated in a reverse direction.

The underlying invention relates particularly to a hydraulic forming machine, more particularly a forging hammer, for workpiece forming, comprising a hydraulic cylinder for driving a ram configured for workpiece forming, and a hydraulic circuit configured for operation of the hydraulic cylinder, wherein the hydraulic circuit has an actuator with an adjustably variable volume flow via which a first hydraulic working chamber of the hydraulic cylinder, used to accelerate the ram during the execution of a working stroke (A) for workpiece forming, can be provided with hydraulic fluid. The hydraulic circuit is configured to adjust and vary the volume flow of the valve or actuator, depending on a setpoint speed (Vsoll) of the ram to be achieved in an acceleration phase of a working stroke (A), and to optimize the subsequent movement phase.

A vibration damper for a vehicle comprises a damper tube filled with hydraulic fluid, a working piston which is connected to a piston rod and arranged within the damper tube so as to be movable back and forth, wherein the interior of the damper tube is divided by the working piston into a first working chamber and a second working chamber, a closure assembly which fluid-tightly closes off the damper tube at the piston rod side, a rebound stop arrangement having a rebound stop piston, which is mounted on the piston rod, and a rebound stop sleeve for receiving the rebound stop piston in the rebound stage, wherein the rebound stop piston separates off a rebound stage working chamber within the rebound stop sleeve, and wherein the rebound stop piston has a bypass channel for fluidically connecting the piston-rod-side working chamber to the rebound stage working chamber, wherein a valve device is arranged in the rebound stop piston hydraulically in parallel to the bypass channel.

A material calculator for a truck to deliver a predetermined quantity of brine per mile driven by the truck for a known route of miles independent of and proportional to truck speed, wherein the truck carries a known number of gallons of brine and a known number of pounds of salt. The material calculator has a processor accepting entry values of route miles to be driven, number of times the route of miles is to be driven, number of gallons of brine carried by the truck, and the number of pounds of salt carried by the truck. The processor has software for calculating dispensing of the brine and salt so that each is exhausted when the route is completed. A hydraulic pump pumps hydraulic fluid to a variable flow positive displacement pump to implement the calculated number of gallons of brine per mile to be dispensed for the known route.

The invention relates to a quick changer (1) for changing an attachment on a construction machine, comprising: a carrier (2), which has a first receptacle (4) for a first coupling element on one side thereof and a second receptacle (5) for a second coupling element on the other side thereof; and a drive device (12) movably arranged at the support (2) in order to move the at least one locking element (13) associated with the first receptacle (4) between an extended locking position and a retracted release or replacement position, a plurality of hydraulic quick couplings being arranged at the drive device (12) in order to supply the additional device with hydraulic fluid. According to the invention, only three hydraulic quick couplings (19A, 19B, 19C) arranged next to one another are arranged on the drive device (12), of which two outer hydraulic quick couplings (19A, 19B) lie in the same plane and in contrast, the inner hydraulic quick coupling (19C) lying therebetween is offset in height upwards.

A system for braking a work vehicle includes a brake assembly comprising a primary braking cylinder and a spring-applied, hydraulic-release (SAHR) braking cylinder operatively coupled to the primary braking cylinder. The primary braking cylinder includes a braking piston configured to actuate a brake element to engage and disengage the brake assembly. The system also includes a manual brake input device configured to actuate the braking piston when the work vehicle is operated in a manual mode, and a control valve configured to regulate a supply of pressurized hydraulic fluid to the SAHR braking cylinder. In addition, the system includes a computing system configured to control an operation of the control valve to regulate the supply of pressurized hydraulic fluid to the SAHR braking cylinder such that the SAHR braking cylinder actuates the braking piston when the work

A construction machine is capable of returning the posture of an earth removal plate (blade) from a rocking posture to a predetermined normal posture. A stay is mounted on the construction machine body to move in upward and downward directions. The earth removal plate is mounted on the distal end portion of the stay, and is rockably movable in forward and rearward directions by an angle cylinder controlled by a flow of hydraulic fluid in response to receiving an instruction about rocking the earth removal plate. A normalization switch gives an instruction to set the posture of the earth removal plate to a predetermined normal posture from the rocking posture. The posture of the earth removal plate is set to the predetermined normal posture from the rocking posture in response to the instruction from the normalization switch.

A system and method delivering hydraulic liquid at different predetermined and controllable pressures for a hydraulic tool or machine is disclosed. The system comprises an electric motor (100) comprising a rotor (110) and a stator (120); a pump (200), the pump being a plunger-type pump and comprising a cam (210), a cam shaft (220), a plunger (230), a plunger chamber (240), and a valve (250), the valve (250) opening or closing an inlet (260) for the hydraulic liquid to the plunger chamber (240), the plunger chamber (240) comprising an outlet (270) for the hydraulic liquid, the plunger (230) engaging the cam (210), and the cam shaft (220) being connected to the rotor (110); a pressure sensor (290) sensing pressure of the hydraulic liquid to be delivered; and a controller (300) configured to control the opening and closing of the valve (250) in relation to pressure sensed by the pressure sensor (300) and rotational position of the rotor (110) or cam (210), the controller (300) thereby controlling the volume and pressure of the hydraulic liquid to the outlet (270) and the load on the electric motor (100).

A hydraulic device for a pitch system of a wind turbine includes an air separation device which includes a fluid collector having an air accumulation portion, at least one fluid inlet and a fluid outlet portion, wherein a fluid emulsion of air and hydraulic fluid can be introduced into the fluid collector through the at least one fluid inlet. The fluid collector is labyrinth-shaped so that rotation of the air separation device about an axis of rotation causes the air in the fluid emulsion to move through the labyrinth-shaped fluid collector in a direction to the air accumulation portion and the hydraulic fluid in the fluid emulsion to move through the labyrinth-shaped fluid collector in a direction to the fluid outlet portion.

This prevents the work attachment from experiencing insufficient output. [Solution] The work machine includes an attachment mounting section to which a work attachment 9 including a hydraulic actuator is detachably mounted, a hydraulic fluid outlet port 61 to which a hydraulic fluid supply passage for supplying hydraulic fluid to the hydraulic actuator can be connected, a first hydraulic power source 60L and a second hydraulic power source 60F capable of supplying hydraulic fluid to the hydraulic fluid outlet port 61, a second oil passage L8 connecting the second hydraulic power source 60F and the hydraulic fluid outlet port 61, and the first hydraulic power source 60L and the hydraulic fluid outlet The system includes a first oil passage L8a connecting to the outlet port 61 or the second oil passage L8, and is switchable between a first mode that allows the supply of hydraulic fluid from the second hydraulic source 60F to the hydraulic fluid outlet port 61 and blocks the supply of hydraulic fluid from the first hydraulic source 60L to the hydraulic fluid outlet port 61, and a second mode that allows the supply of hydraulic fluid from the second hydraulic source 60F to the hydraulic fluid outlet port 61 and from the first hydraulic source 60L to the hydraulic fluid outlet port 61.

One or more techniques and / or systems are disclosed for providing hydraulic fluid of a hydraulic system of a work vehicle to one or more fluid demand subsystems to prioritize output of one or more actuators associated with the one or more fluid demand subsystems. A control system of a work vehicle may include an operator input system, a sensor array, and a controller configured to determine an operating mode of the work vehicle based at least on a state of the work vehicle and an input command. The control system may also be configured to generate a modified command based on the determined mode of operation, the input command, and a specification of the work vehicle. The modified command may then be used to provide hydraulic fluid to a fluid demand subsystem and to drive movement of a movable element of the work vehicle.

The invention relates to a damping device (28) for a bicycle (10), said damping device comprising an outer tube (30) and an inner tube (32) located coaxially to the outer tube, wherein a compensation chamber (34) for receiving hydraulic fluid is formed between the outer tube (30) and the inner tube (32), and also comprising a piston (40) which is connected to a piston rod (42) and can be moved back and forth within the inner tube (32), wherein the piston (40) divides the interior of the inner tube (32) into a working chamber (44) that is free of the piston rod and a working chamber (46) that contains the piston rod, wherein the damping device (28) also comprises a valve assembly (50) and an adjustment device (55) for adjusting the damping of the valve assembly (50) in the rebound stage and / or the compression stage, and wherein the damping device (28) has a gas reservoir (98) which is located coaxially to the adjustment device (55) and encircles the adjustment device (55).

A hydraulic system (12) for an aircraft (10), wherein the hydraulic system (12) includes a hydraulic power pack (14), a hydraulic fluid reservoir (28) and a hydraulic pump (30), a hydraulic consumer (18), a high-pressure supply line (38) supplying the hydraulic consumer (18) with hydraulic fluid under higher pressure, and a low-pressure return line (40) returning hydraulic fluid under lower pressure from the hydraulic consumer (18); heating device (42) with a short-cut line (44) connecting the high-pressure supply line (38) with the low-pressure return line (40) and a heater valve (46) for opening and closing the short-cut line (44), and a control and monitoring unit (43). Temperature management includes automatically controlling a fluid temperature by monitoring the fluid temperature and controlling the heater valve (46).

Door drive (1), in particular a door closer, with hydraulic damping, in particular for a fire door, wherein the door drive (1) comprises: a housing (3) with a housing interior in which a hydraulic fluid is provided, a functional element (7, 9) which is inserted into an opening (5) of the housing (3), and a sealing element (11) which seals the housing (3) to the outside in the area of ​​the opening (5), wherein the sealing element (11) consists at least partially of a material which has a defined melting temperature, characterized in that that the sealing element (11) is a sealing ring, that the functional element (7) comprises a circumferential outer groove (13) which receives the sealing element (11), and that the outer groove (13) of the functional element (7) has an outwardly directed support surface (15) with at least one recess (17) which acts as a flow contour for the hydraulic fluid.

The invention relates to a damping device (28) for a bicycle (10), comprising an outer tube (30) and an inner tube (32) arranged coaxially to same, wherein a compensation chamber (34) for receiving hydraulic fluid is formed between the outer tube (30) and the inner tube (32), and a piston (40) which is connected to a piston rod (42) and which is arranged so as to be movable back and forth within the inner tube (32), wherein the interior of the inner tube (32) is divided by the piston (40) into a piston-rod-remote working chamber (44) and a piston-rod-side working chamber (46), and wherein the damping device (28) has a valve device (50) mounted on the outside of the outer tube (30) and having a compression damping valve (52) for damping the piston movement in the compression stage and having a rebound damping valve (54) for damping the piston movement in the rebound phase, and wherein the valve device (28) has a valve body (72) with an inner fluid channel (66) and an outer fluid channel (64) which is arranged radially outwards with respect to the inner fluid channel (66), and has a first and a second disc spring stack (74, 76) which are mounted on opposite sides of the valve body (72), and wherein the first disc spring stack (74) at least partially radially covers the inner fluid channel (66) and wherein the second disc spring stack (76) at least partially radially covers the inner and the outer fluid channel (64, 66) and has a fluid passage (88) which is fluidically connected to the inner fluid channel (66).

The present invention relates to a hydraulic system for construction machinery, comprising: a drive device operated by hydraulic pressure; an operation unit for controlling the drive device; a prime mover for generating power; a main pump driven by the prime mover and configured to discharge main hydraulic fluid; a main control valve configured to receive a corrected pilot pressure and control the supply of the main hydraulic fluid to the drive device; a pilot pump driven by the prime mover and configured to discharge pilot hydraulic fluid; and a pilot compensation unit configured to generate, via the pilot hydraulic fluid, the corrected pilot pressure, which is obtained by adding a compensation pilot pressure to an initial pilot pressure corresponding to the operation amount of the operation unit, and to provide the corrected pilot pressure to the main control valve, wherein the pilot compensation unit varies the compensation pilot pressure in correspondence with the rotational speed of the prime mover.

The present invention relates to an assembly or kit for adjusting agricultural machinery for deep soil conditioning or soil decompaction processes with a variable depth setting, suitable for being incorporated into new or existing agricultural machinery, such as decompactors, subsoilers, chisel ploughs, paratill ploughs, weeders and the like, which is characterised in that it comprises a hydraulic control device interposed in the hydraulic circuit of said agricultural machinery, usually between the hydraulic fluid pressure pump and the actuators, which are usually hydraulic; and a programmable control device, which contains stored information about the ground to be worked, such as moisture, compaction level and other parameters of interest for the task, and which is programmed to determine the depth of penetration of the agricultural implement of the machinery into the soil based on said parameters.

This application relates to the field of hydraulic technology for injection molding machines, and provides a high-speed, precision mold-opening control circuit board. In use, the hydraulic fluid enters the P port of the first directional valve from the main return port. Adjusting the valve core position directs the fluid to the A / B ports of the first directional valve, entering the rodless / rod-side connection port, thus supplying oil to the rodless / rod-side chambers of the mold-locking cylinder. Simultaneously, oil from the rod / rodless chambers of the mold-locking cylinder discharges to the rod / rodless interface, allowing the fluid to flow to the T port of the first directional valve. Because a differential circuit is provided, activating the differential circuit connects the passage between the A port of the first directional valve and the rodless / rodless connection port with the passage between the T port of the first directional valve and the main return port. This allows the fluid entering the rodless / rodless chamber of the mold-locking cylinder simultaneously with the fluid entering the rodless / rodless chamber, creating a confluence effect that enables the mold-locking cylinder to move at a faster speed, improving production efficiency.

In a work vehicle whose wheels are driven by a hydraulic motor, the hydraulic hose from the hydraulic pump mounted on the machine is connected to the hydraulic motor with minimal damage. [Solution] The system includes a steering member 26, a wheel 19 supported by the steering member 26, a hydraulic motor 27, and a first hydraulic hose 10 capable of supplying hydraulic fluid from a hydraulic pump to the hydraulic motor 27. The first hydraulic hose 10 is fixed to the first fixing member 41 and has a first portion 11 that extends from the first fixing member 41 along the support arms 8 and 9 toward the opposite side from the steering member 26, a second portion 12 that extends from the first portion 11 in the opposite direction along the support arms 8 and 9 toward the steering member 26, and a third portion 13 that extends from the second portion 12 toward the hydraulic motor 27, is fixed to the second fixing member 42 and connected to the hydraulic motor 27.

A control device for controlling a hydraulic pump (130) of a main machine (100) equipped with first sensors (190, 191) for detecting physical quantities of an actuator (110) includes: a flow control unit (212) for controlling the flow rate of a hydraulic fluid, a pressure control unit (211) for controlling the pressure of the hydraulic fluid, first control units (214, 216) for controlling physical quantities of an actuator (110), and a communication unit (210) for receiving first information including a target value of a physical quantity of the actuator (110) output from a main machine control unit (300) connected to the main machine (100) and the current value of the physical quantities output from the first sensors (190, 191). Necessary control is selected for each process of the main machine (100) on the basis of the first information.

A hydraulic disc braking system is disclosed. The system has a manually operated control device for a cyclist to issue a braking command. The system has a master cylinder assembly having a membrane dividing the hydraulic fluid tank into a variable volume filled chamber and a complementarily variable volume empty chamber. A membrane detector senses the presence of the membrane relative to a predetermined position in the tank and / or a meter measures the distance of the membrane from the ceiling of tank.

A control device that controls operation of a valve body of a valve device, includes a flow rate acquisition unit that acquires a flow rate of the valve device, a flow state determination unit that determines whether or not a flow of hydraulic fluid of the valve device is a transient flow state based on an input flow rate target value and a flow rate estimated value estimated by the flow rate acquisition unit, an opening command calculation unit that calculates an opening command based on the flow rate target value and a pressure difference before and after the valve device, and a valve body control unit that controls operation of the valve body, the valve body control unit controlling operation of the valve body based on the opening command when the flow state determination unit determines that it is not a transient flow state, and controlling operation of the valve body based on the flow rate target value when the flow state determination unit determines that it is a transient flow state.

A system and method for a hydraulic swing system of a machine to prevent drift without engaging a swing brake is described. The hydraulic swing system includes a pump powered by a motive element such as an engine and provides a swing motor for rotating the chassis of the machine relative to the undercarriage. The swing system includes a control valve on a first path between the pump and the motor and a second control valve on a second path. The swing system further includes a blocking valve to blocking hydraulic fluid flow and thereby preventing drift engaged when the system is in neutral and below a threshold rotation rate.

The present invention provides a work machine that can prevent insufficient output from the work attachment while ensuring the safety of the worker. [Solution] The present invention comprises an attachment mounting section to which a work attachment including a hydraulic actuator is detachably mounted, a hydraulic system capable of supplying hydraulic fluid to the hydraulic actuator, and a notification device that notifies the worker. The hydraulic system includes a hydraulic fluid outlet port to which a hydraulic fluid supply path for supplying hydraulic fluid to the hydraulic actuator can be connected, and is configured to be switchable between a first mode in which the amount of hydraulic fluid that can be supplied to the hydraulic fluid outlet port is set to a predetermined supply amount, and a second mode in which the amount of hydraulic fluid that can be supplied to the hydraulic fluid outlet port is greater than the predetermined supply amount. The notification device notifies the user that it is in the second mode or that it has entered the second mode, at least when switching to the second mode.

The invention relates to a hydraulic actuator (1) having the ability to recover energy from the pressure of a hydraulic fluid, having at least one bidirectionally operable hydraulic pump (2) for pumping the hydraulic fluid, the hydraulic pump (2) having two ports (6a, 6b); and a hydraulic actuator assembly (3) having two hydraulic fluid chambers (4a, 4b) to which hydraulic fluid can be applied in order to drive the hydraulic actuator assembly (3), in which the hydraulic fluid chambers (4a, 4b) are each connected to the ports (6a, 6b) of the hydraulic pump (2) by means of pipelines (7a, 7b), such that when one of the hydraulic fluid chambers (4a, 4b) is filled with hydraulic fluid, the hydraulic fluid is supplied to the hydraulic actuator assembly (3). The second chamber (4b) has a second chamber cross-section (8b) which is different from the first chamber cross-section (8a) of the first chamber (4a), and wherein the first chamber (4a) is connected to a pressure accumulator (5), and wherein the second chamber cross-section (8b) of the second chamber (4b) is different from the first chamber cross-section (8a) of the first chamber (4a). A differential volume (28) can be received and provided in the pressure accumulator, the differential volume (28) being caused by different chamber cross-sections (8a, 8b) of the chambers (4a, 4b); wherein a first line (7a) connects the first chamber (4a) to the hydraulic pump (2), a second line (7b) connects the second chamber (4b) to the hydraulic pump (2), and the first line (7a) and the second line (7b) are further connected to each other by a bypass line (9) by means of which when the pressure in the second line (7b) drops from above to a threshold value, the pressure in the second line (7b) drops from above to the threshold value. According to the invention, a bypass flow from the first line (7a) into the second line (7b) is established via a bypass line (9) in order to prevent an insufficient supply of hydraulic fluid in the hydraulic pump (2), a deactivation circuit (11) being arranged in the bypass line (9), by means of which the bypass line (9) can be interrupted when the pressure in the second line (7b) is above a threshold value.

The present invention relates to a damping device (28) for a bicycle (10) comprising an outer tube (30) and an inner tube (32) arranged coaxially to it, wherein a compensation chamber (34) for receiving hydraulic fluid is formed between the outer tube (30) and the inner tube (32), and a piston (40) connected to a piston rod (42), which is arranged to be movable back and forth within the inner tube (32), wherein the interior of the inner tube (32) is divided by the piston (40) into a working space (44) remote from the piston rod and a working space (46) on the side of the piston rod, and wherein the damping device (28) has a compression stage valve (52) for damping the piston movement in the compression stage and a rebound stage valve (54) for damping the piston movement in the rebound stage, wherein the damping device (28) has a compression stage adjusting device (68) for adjusting the damping of the compression stage valve (52) and a rebound stage adjusting device (92) for adjusting the damping of the rebound stage valve (54) and wherein the compression stage adjusting device (68) and rebound stage adjusting device (92) are arranged at the same end region of the damping device (28).

Rock drilling machine (10) comprising a hydraulic percussion unit (11) including a percussion piston (12) for providing percussive impulses to a shank adapter (13) of the rock drilling machine (10) in a forward direction (Dfwd), the shank adapter (13) being configured to be connected to a drill string (6) during operation. A hydraulic damper unit (14) is arranged for damping the recoil movement of the shank adapter (13) in the backward direction (Drev), and a hydraulic extractor unit (16) is arranged for actuating the shank adapter (13) in the backward direction (Drev). The rock drilling machine comprises an inlet coupling (Cp) for connection to a pressure source (P) of pressurised hydraulic fluid and an outlet coupling (CT) for connection to a tank (T) for non-pressurised hydraulic fluid. Further, the inlet coupling (Cr) is connectable to both the hydraulic damper unit (14) and the hydraulic extractor unit (16). The disclosure also relates to a drill rig comprising such a rock drilling machine. (FIG. 4)

A hydraulic drive system 24, in particular for a self-propelled construction machine, comprises at least one hydraulic pump (28) driven by a drive unit (26) for conveying hydraulic fluid, a hydraulic circuit (30) receiving hydraulic fluid conveyed by the at least one hydraulic pump (28) and returning hydraulic fluid to the at least one hydraulic pump, at least one hydraulic motor (32, 34) supplied with hydraulic fluid conveyed by the at least one hydraulic pump (28) via the hydraulic circuit (30), a discharge line arrangement (52) for discharging hydraulic fluid from the hydraulic circuit (30) to a hydraulic fluid accumulator (42), and at least one flushing line (64) supplied from the hydraulic circuit (30) for flushing at least one hydraulic component of the hydraulic drive system (40) with hydraulic fluid.wherein at least one flushing line (64) branches off from the discharge line arrangement (52) and / or forms a line section of the discharge line arrangement (52).