1079 results about "Hydraulic circuit" patented technology

A hydraulic circuit is disclosed which includes one or more i) linear; or ii) rotary hydraulic actuator, wherein total number of cylinder chambers is N, M pressure rails, a valve arrangement, including M hydraulic rail ports each coupled to a pressure rail, N hydraulic chamber ports each coupled to a chamber of one or more actuators, N proportional valves each corresponding to one of the N hydraulic chamber ports, X sets of on-off valves and check valves coupling two or more hydraulic rail ports to each of supply sides of each of the N proportional valves, and Y sets of on-off valves and check valves coupling two or more hydraulic rail ports to each of return sides of each of the N proportional valves, and a controller configured to in real-time operate the N proportional valves and the associated on-off valves to achieve one or more desired functional parameters.

A cooling system for a drive device with several electric machines, the cooling system including a hydraulic circuit for a coolant including a cooling part in a gearbox of the drive device for cooling the gearbox, and an air / coolant heat exchanger including cooling walls forming channels for circulating coolant for the cooling thereof, an air cooling circuit including a plurality of fans, rotationally coupled to the gearbox, a cooling part between the cooling walls of the air / liquid heat exchanger, wherein the air sucked in and propelled by the fans circulates by sweeping over the cooling walls in order to cool them.

An electric drive for a vehicle comprises a housing, an electric machine with a stator connected to the housing and including stator end-windings, a rotor rotatable relative to the stator, and a driveshaft connected to the rotor and rotatably supported in the housing about an axis of rotation, a transmission to transmit a rotary movement from the driveshaft to drive a driveline of the vehicle, and a hydraulic circuit for circulating a fluid.

The invention discloses a harvester header height control method and system based on multi-source sensing information fusion, and belongs to the field of agricultural machinery automation control. The problems that in the prior art, actually-measured height detection deviation is large, and the height detection data source is single are solved, the longitudinal height and the transverse inclination angle of the header are calculated and adjusted in real time through multi-source sensor data, the accuracy of the height and the posture of the header is guaranteed from multiple dimensions so as to adapt to the complex working environment, and the working efficiency is improved. The precise control process of a hydraulic loop driving system on longitudinal and transverse hydraulic cylinders is defined, a reasonable height difference threshold value and a reasonable angle difference threshold value are set, fine regulation and control of the height of the header are achieved, abnormal conditions such as crop cutting missing and soil shoveling are reduced, crop and topographic feature points are extracted through a visual detection system and a deep convolutional neural network, and the accuracy of crop cutting is improved. A terrain curve and an operation plane can be accurately constructed, accurate operation path guidance is provided for a header, the accuracy and quality of harvesting operation are effectively improved, and the loss rate is reduced.

A suspension system including hydraulic circuits that extend between dampers located at opposite corners of the vehicle and at least one load distribution unit that is connected in fluid communication with at least two hydraulic circuits. The load distribution unit includes a manifold block with a cylinder bore, a pair of pressure tubes, a piston rod assembly, and a pair of reserve tubes. The pressure tubes are partially received in the cylinder bore to define a pair of opposed cylinders. The piston rod assembly includes a piston rod and a pair of opposed pistons that are slidingly received within the opposed cylinders. The reserve tubes are at least partially received in the cylinder bore and are arranged annularly about the pressure tubes to define a first pair of reservoir chambers between the pressure tubes and the reserve tubes.

An operating system, rock drilling rig and method for operating an electrically operated rock drilling rig. The operating system includes an electric system connected to an electric supply source and having one or more electric motors controlled by electric control devices. The system further includes a hydraulic system having one or more hydraulic pumps and hydraulic control devices. There are hydraulic tramming actuators connected to closed loop hydraulic circuits and hydraulic drilling actuators connected to either open or closed loop circuits.

Low-pressure oil enters an inlet of a proportional overflow valve, the pressure of a low-pressure system is controlled by the proportional overflow valve, pressure oil on the low-pressure side acts on a plunger control cavity of the hydraulic control overflow valve through a pressure stabilizing damper and a one-way valve, and hydraulic pushing force generated by a plunger is transmitted to an overflow valve steel ball through a disc spring; when the force obtained by multiplying the ultrahigh pressure of the inlet of the hydraulic control overflow valve by the action area of the steel ball is equal to the pushing force of the plunger, the steel ball of the overflow valve is opened to start overflowing, and the overflow pressure of the ultrahigh pressure system can be controlled by adjusting the pressure of the proportional overflow valve of the low-pressure system. The external control type ultrahigh-pressure proportional pressure regulating valve can be used for pressure regulation of a hydraulic system with the pressure being 200 MPa or above and can be used as a proportional overflow valve of an ultrahigh-pressure hydraulic system. By arranging a hydraulic loop of two auxiliary oil ports of the external control type ultrahigh pressure proportional pressure regulating valve, the pressure rising one-way proportional regulating function, the pressure unloading function and the pressure rising / falling two-way proportional regulating function of an ultrahigh pressure system can be achieved.

A valve for a hydraulic circuit for an aircraft, the valve being configured to unite or separate multiple circuit portions in at least two configurations. More particularly, the valve allows to create one hydraulic circuit or two independent hydraulic circuits in order to circulate a coolant in two distinct manners and thus to adapt the function of the hydraulic circuit to any of two distinct phases of the functioning of an engine of the aircraft.

The invention discloses a hydraulic system sealing test bench and a sealing performance test method, and belongs to the technical field of sealing performance detection, the test bench comprises a vibration device, a pressure control system, a sealing element installation device, a flow adjusting system and a micro leakage detection unit; a to-be-tested sealing element is installed in the sealing element installation device to form a sealing cavity, and the sealing cavity is communicated with the pressure control system, the flow adjusting system and the hydraulic oil tank through pipelines to form a closed hydraulic loop. The vibration device is arranged on the outer side of the sealing element mounting device and used for applying vibration loads, the pressure control system is used for providing and adjusting hydraulic pressure in the sealing cavity, the flow adjusting system is used for controlling the flowing speed and flow of a hydraulic medium, and the micro-leakage detection unit is arranged below the sealing element mounting device and used for detecting leakage of the sealing cavity. The method has the advantages of being high in test condition controllability, high in leakage detection sensitivity, wide in adaptability and high in test result engineering guidance.

A patient handling apparatus includes a patient support surface, a base, and a hydraulic circuit. The hydraulic circuit includes a pump, a fluid reservoir, and a hydraulic cylinder operable to selectively raise or lower the patient support surface or the base. The hydraulic circuit controls flow of fluid between the cylinder and the fluid reservoir to thereby control the movement of the base or patient support surface. In addition, the hydraulic circuit may include a manual bypass circuit configured to bypass the pump in response to a manual input, which allows manual extension or retraction of the cylinder, for example, when the pump is not operational. The hydraulic circuit may also include a pump bypass circuit configured to bypass the pump to allow fluid to discharge from the cap end to the fluid reservoir for faster evacuation of fluid from the cylinder, thereby increasing retraction speed of the rod.

A hydraulic drive apparatus includes a hydraulic pump that discharges a working fluid; a flow dividing valve that divides a pump passage connected to the hydraulic pump into first and second passages, and changes an opening degree of each passage according to a signal that is input to the flow dividing valve; a travel system hydraulic circuit that is connected to the first passage and controls a flow of the working fluid to a travel motor; a loading system hydraulic circuit that is connected to the second passage and controls a flow of the working fluid to a loading actuator; a pressure sensor that detects a pressure supplied to the travel motor; and a control device that controls, by outputting the signal to the flow dividing valve, the opening degree of the first and second passages according to the pressure detected by the pressure sensor.

The drive system comprises a hydraulic pump and a hydraulic motor, both having an inlet port and an outlet port, the motor being a fixed displacement motor directly coupled to the cleaning fan for rotationally driving said fan, the pump being a variable displacement pump configured to produce a flow of hydraulic liquid to the motor. In a system according to the invention, the outlet port of the pump is coupled to the inlet port of the motor by a hydraulic line, wherein said line does not comprise a valve for regulating a flow of hydraulic liquid to the motor. In the system of the invention, the flow to the motor is not regulated through a flow regulating valve between pump and motor, but by changing the pump displacement electronically. To this aim, the pump includes an electronically actuated hydraulic control system for controlling the pump displacement regardless of the hydraulic pressure of the liquid in the hydraulic line between the pump and the motor. The pump and the motor are part of an open hydraulic circuit.

The invention discloses an underwater hydraulic driving device, which belongs to the technical field of oilfield oil and gas development, and comprises an ROV pressure supply unit and a hydraulic power unit, the ROV pressure supply unit is connected with the hydraulic power unit, the ROV pressure supply unit drives the hydraulic power unit to output hydraulic power to the hydraulic power unit, and the hydraulic power is output to the hydraulic power unit by changing the hydraulic flow and pressure provided by the ROV pressure supply unit. The output flow and pressure of the hydraulic power unit can be adjusted, and the hydraulic power unit is connected with an ROV external tool. A hydraulic loop of the ROV pressure supply unit is effectively isolated from a hydraulic loop generated by the hydraulic power unit, external seawater is prevented from entering the hydraulic system of the ROV, and the hydraulic system has the advantages and characteristics of being convenient and fast to mount or dismount, convenient to test, small in occupied space, light in weight, high in reliability, large in pressure adjustable range and the like.

A brake system for a vehicle include first brake devices respectively provided in two vehicle wheels of a vehicle and configured to perform a braking operation by transmitted liquid pressure, second brake devices respectively provided in the other two vehicle wheels of the vehicle and configured to perform a braking operation by an embedded second electromechanical actuator, a reservoir, a master cylinder including a master chamber, and a master piston provided in the master chamber, a hydraulic actuator configured to generate the liquid pressure by an electrical signal outputted in response to a displacement amount of the brake pedal, a hydraulic circuit configured to control the liquid pressure to be transmitted to the first brake device, and an electronic control unit configured to control the first electromechanical actuator, the hydraulic actuator, and the hydraulic circuit so that the first brake device and the second brake device generate braking forces.

The invention discloses a noise optimization control system for an actuating mechanism of a sanitation vehicle, and belongs to the technical field of gas circuit control. The system comprises a hydraulic control loop, a pneumatic control loop and a controller. The hydraulic loop comprises an oil pump, an oil tank, a main reversing valve and an action oil cylinder; working ports A and B of the main reversing valve are respectively communicated with a rodless cavity and a rod cavity of the action oil cylinder; the pneumatic loop comprises an air source, a first reversing valve, a second reversing valve, a reversing air cylinder and a buffering assembly. The air source is communicated with a rodless cavity and a rod cavity of the reversing air cylinder through a first air path and a second air path respectively, a first reversing valve and a second reversing valve are arranged on the two air paths respectively, and the control ends of the two valves are both electrically connected with the controller. The extension and retraction actions of the reversing cylinder control the main reversing valve to switch working ports; in order to slow down the speed that the reversing cylinder pushes a valve rod in the main reversing valve to switch working ports, a first buffering assembly is further arranged on the reversing oil cylinder. According to the invention, the corresponding buffer assembly is additionally arranged, so that the noise optimization control of the actuating mechanism of the sanitation vehicle is realized.

The invention discloses an emergency hydraulic system and a control method thereof. The emergency hydraulic system comprises a multi-source redundant hydraulic loop, a multi-mode sensing and fault diagnosis module, a cooperative control strategy module, a man-machine cooperative emergency operation interface module and an intelligent energy management module. By adopting the multi-source redundant hydraulic loop design, the problems that a traditional emergency hydraulic system is single in power source and lacks redundancy are effectively solved, and the reliability and stability of the system are remarkably improved. When the main hydraulic pump breaks down, the standby hydraulic pump and the pneumatic auxiliary pump can be rapidly started, continuous operation of the hydraulic system is ensured, and shutdown or safety accidents caused by system faults are prevented. Key parameters of the hydraulic system are monitored in real time, feature extraction and fault recognition are carried out on sensor data in combination with a deep learning algorithm, and rapid positioning and accurate evaluation of faults of the hydraulic system are achieved.

An electric drive arrangement for a vehicle includes a housing. The electric drive arrangement includes an electric machine with a stator connected to the housing and a rotor with a rotor shaft rotatably supported in the housing. The electric drive arrangement includes a transmission to transmit a rotary movement from the rotor shaft to drive a driveline of the vehicle. The electric drive arrangement includes a hydraulic circuit for circulating a fluid to cool and lubricate the electric machine and the transmission.

The invention discloses an automatic design and optimization system for a hydraulic speed control loop, which takes a large language model intelligent body as a core, realizes automatic design and optimization of the hydraulic speed control loop through semantic comprehension, knowledge retrieval and parameter optimization, and specifically comprises an LLM intelligent body, a data processing module and a data processing module, the analysis module is used for analyzing natural language input containing design requirements and performance targets of a user, generating a loop structure in combination with a local knowledge base and calling an optimization algorithm; the local knowledge base comprises a basic hydraulic loop, a key empirical relationship and a typical structure template which are artificially extracted; and the simulation and optimization module is used for executing a swarm intelligence optimization algorithm to optimize and adjust parameters of the loop structure. The invention constructs a hydraulic speed control loop automatic design and optimization system with semantic understanding, automatic generation and adaptive optimization capabilities, and aims to realize full-process intelligent design from user demand input to loop structure generation and performance optimization.

The utility model belongs to the field of hydraulic systems, and particularly relates to a hydraulic circuit for a lifting load of hoisting equipment, when the hydraulic circuit operates normally, especially when a first hydraulic pipeline is intact, control pressure applied to a descending brake valve is sufficient to overcome pre-tightening force of an elastic pre-tightening piece; on the contrary, if the first hydraulic pipeline is broken and the pressure in the first hydraulic pipeline is sharply reduced, the pressure of the control end of the descending brake valve is not enough to overcome the pre-tightening force of the elastic pre-tightening piece, at the moment, the valve element of the descending brake valve is switched back to the blocking position, the second hydraulic pipeline is blocked, and the load is prevented from being further reduced; therefore, the load can be safely prevented from being out of control and falling.

A hydraulic circuit includes a first oil path, a second oil path, a hydraulic control circuit, a third oil path, a check valve, and a relief valve. The first oil path links to a discharge port of a first oil pump. The second oil path links to a discharge port of a second oil pump. In the hydraulic control circuit, a first regulator valve is disposed downstream of a confluence point of the first oil path and the second oil path. The third oil path connects a suction port of the first oil pump and a strainer. The check valve is provided in the third oil path and restricts a movement of oil toward the strainer side. The relief valve is provided in the third oil path and discharges oil in the third oil path to an outside when a pressure in the third oil path exceeds a reference pressure.

The invention provides a method and a device for determining a joint point of a hydraulic clutch, a vehicle, equipment and a medium, and relates to the technical field of clutch control. The preset change trend is used for representing a corresponding pressure value change trend when the pressure value is transited from a relatively stable rising rate state to a continuously increasing rising rate state in the oil filling process, so that an inflection point for converting the pressure value from stable rising to rapid pressurization in the whole oil filling and pressure building process is determined; the inflection point can be regarded as a point where pressure in a hydraulic loop tends to rise rapidly under the influence of resistance of the driving end of the hydraulic clutch when the hydraulic clutch is combined, and a pressure value corresponding to the point can be regarded as a pressure value of a clutch combination point. Through the mode, high-voltage equipment such as a motor / an engine does not need to be started, operation can be carried out in a low-voltage state, influence factors are reduced, and the stability and accuracy of self-learning are guaranteed.

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.

An apparatus for generating an ultra-high pressure fluid jet during drilling comprises a drilling motor; a housing structure connected with the drilling motor; and a drill bit assembly connected at the downstream end of the housing structure. The housing structure comprises an oscillation tool configured to transfer a pressure energy from pumped drilling fluid to a closed loop hydraulic circuit and pressurize the same therein; a pressure intensifier pump configured to increase hydraulic pressure of closed loop hydraulic fluid to an ultra-high pressure; and a pressure transfer tool configured to transfer the ultra-high pressure from the closed loop hydraulic fluid to the low-pressure drilling fluid, without any communication between the drilling fluid and closed loop hydraulic fluid and without requiring the drilling fluid to enter pressure intensifier pump. The ultra-high pressure of drilling fluid is directed to the drill bit assembly to aid drilling efficiency in drilling applications.

A heat exchange apparatus for working fluids in power machines, including a portion of hydraulic circuit within which the working fluid is adapted to flow, in this hydraulic circuit portion the following being provided: - a radiator, including o a radiator inlet, for the working fluid to enter the radiator, o an outlet, for the working fluid to exit the radiator, o a heat dissipation path for the fluid between the inlet and the outlet, - a fluid discharge path adapted to bypass the heat dissipation path, - a pilotable valve, arranged upstream of the dissipation path and the discharge path, adapted to manage the flow of the working fluid between the fluid discharge path and the heat dissipation path, - an electronic control module, operationally connected to the pilotable valve and configured to pilot the pilotable valve so that the working fluid, depending on the piloting imposed by the electronic control module, is adapted to pass through  only the heat dissipation path, or  the fluid discharge path, at least partially. With this configuration, it is possible, with a single valve device built into the radiator, to bypass on command the heat dissipation channels according to a desired logic of fluid flow management provided in the electronic control module, sending a certain quantity of working fluid, when needed, to the radiator outlet, thus being able, for example, to anticipate the pressure peaks, to optimize the thermal power, to manage radiator temperatures, etc.

Proposed is an electro-hydraulic brake device including a main brake unit configured to provide a braking fluid to a plurality of wheel cylinders by driving a motor, a storage unit connected to the main brake unit, and configured to store the braking fluid, an auxiliary brake unit configured to provide the braking fluid to one or more of the wheel cylinders when an operational failure of the main brake unit occurs, and configured to divide a hydraulic line of a hydraulic circuit unit physically by a function, wherein the hydraulic circuit unit disposed at a block unit is connected to the main brake unit and the storage unit.

A fine grading system for a work machine with a frame, a boom assembly, an attachment coupler, a grading box, and an upper attachment frame portion extending forward of the grading box with a stabilizer wheel. A controller, a positioning unit, a hydraulic circuit communicatively coupled to the controller are configured to selectively adjust at least one proportional relief valve as a function of the output signals from sensors coupled to the pitch hydraulic actuators and the boom hydraulic actuators corresponding to the grading pressure to be generated by the actuators to position the grading box with respect to the ground surface. The system and method controls at least one proportional relief valve to maintain a target pressure.

The steering engine (1) includes: a steering engine body (11) of the Rahson sliding type including at least one hydraulic device operating according to an electrical signal; and at least one control device (9) which is installed on the steering engine main body (11) and controls the at least one hydraulic device. For example, the steering engine main body (11) comprises: a tiller (2) fixed to a rudder shaft (15); plungers (3A, 3B) that engage with the tiller (2); cylinders (4A-4D) into which both ends of the plungers (3A, 3B) are inserted, respectively; and a plurality of hydraulic units (5) that constitute a hydraulic circuit together with the cylinders (4A-4D), and a control device (9) is attached to each of the cylinders (4A-4D).

A vehicle, defined in particular by a boat (1), is provided with an energy conversion system (100), having a hydraulic circuit (101) and a hydraulic cylinder (120), which includes a barrel (121), a rod (122) axially sliding in the barrel (121), and a piston (124), fixed with respect to the rod (122); the piston (124) is coupled to the barrel (121) in a fluid-tight manner so as to axially separate two chambers (126), communicating with the hydraulic circuit (101) by check valves (137,140), and is placed in an axial reference position, in rest conditions, by spring members (132); a component (10), having an oscillatory or vibratory motion, is connected to one of the barrel (121) and the rod (122), so as to make the hydraulic cylinder (120) operate as a reciprocating linear pump, in response to such oscillatory / vibratory motion, for generating a hydraulic pressure which can be exploited in a hydraulic system (5) of the vehicle, connected to the hydraulic circuit (101) of the system (100).

The invention discloses a motorcycle ABS performance detection method, system and device and a medium, and relates to motorcycle ABS detection. According to the method, the brake fluid is subjected to dewatering and degassing treatment, and target brake fluid is obtained; establishing an instruction transmission channel; the brake pipeline is subjected to air exhaust operation, and the negative pressure establishment rate and the dwell pressure attenuation rate are measured; judging whether the sealing performance of the brake pipeline reaches the standard or not; if the sealing performance reaches the standard, target brake fluid is injected into the hydraulic loop in an excessive injection mode of the preset target liquid level amount, and after injection is completed, the target brake fluid is controlled to reach the preset liquid level height through a back suction device; and a brake pressure release instruction is sent to the hydraulic device through the instruction transmission channel, and after the hydraulic device drives the brake device to complete brake operation of a preset number of rounds according to the brake pressure release instruction, a detection result is obtained according to the position change of the brake device. By implementing the scheme, the performance of the ABS system can be effectively detected, and the ABS system can be effectively controlled.

Brake systems, vehicles having such brake systems, and methods of operating and installing the brake systems on vehicles. Such a brake system operates one or more brakes to reduce the speed of the vehicle through the operation of a brake pedal. The system includes a hydraulic circuit functionally coupled to the one or more brakes and configured to apply a braking force with the brake(s) that is in relation to a change in pressure of hydraulic fluid within the hydraulic circuit, and an air circuit functionally coupling the brake pedal to the hydraulic circuit. The air circuit is configured to convert manual actuation of the brake pedal to a change in the pressure of the hydraulic fluid within the hydraulic circuit and thereby apply a braking force in relation to a degree of actuation of the brake pedal.