27 results about "Variable displacement" patented technology

This invention discloses an articulated / tracked dual-mode steering system, comprising a front articulated chassis and a rear articulated chassis. A front axle is connected to the lower part of the front articulated chassis, and a rear axle is connected to the lower part of the rear articulated chassis. Both ends of the front and rear axles are connected to a triangular track via hydraulic motors. A steering gear is mounted on the front articulated chassis, with its lower end connected to a hydraulic steering unit. The two outlets of the hydraulic steering unit are connected to a left and a right steering cylinder, respectively. The system also includes two variable displacement hydraulic pumps connected in series. One variable displacement hydraulic pump is connected to two hydraulic motors located on the right side, and the other variable displacement hydraulic pump is connected to two hydraulic motors located on the left side. This invention also discloses a vehicle. This invention combines two steering modes into a single working vehicle, allowing the vehicle to use either articulated steering or tracked steering depending on the actual situation, fully utilizing the advantages of both steering modes.

The invention provides a variable displacement vane pump which can adjust the full cut-off pressure in a wide range from low pressure to high pressure by using a single pump without changing a spring. A vane pump is provided with: a plurality of vanes slidably protruding from a rotor that is rotatable about a shaft; a cam ring having an inner peripheral surface in sliding contact with the outer peripheral end of the blade, and being eccentrically rotatable with respect to the shaft; a high-pressure-side spring that urges the cam ring via the plunger; a low-pressure-side spring which is at least partially housed in the holder and which biases the cam ring via the holder and the plunger; a stopper provided on an end side of the low-pressure-side spring opposite to the plunger side; and a pressure adjusting part capable of adjusting the position of the stopper from a position where the stopper does not abut against the stopper even if the cam ring moves the holder to a position where the stopper always contacts the holder or more.

The application provides a variable displacement compressor and an air conditioner, wherein the variable displacement compressor comprises a variable displacement cylinder, the variable displacement cylinder is provided with a variable displacement vane, the variable displacement cylinder is further provided with a pin assembly corresponding to the variable displacement vane, the pin assembly comprises a variable displacement pin, a movable pin and an elastic member clamped between the tail of the variable displacement pin and the head of the movable pin, wherein the head of the variable displacement pin can lock and unlock the variable displacement vane. The application greatly reduces the impact of the variable displacement pin and the movable pin on the variable displacement vane respectively or the impact of the movable pin on the component for forming the stop position, reduces the high-frequency noise generated by the impact, effectively prevents the formation of pits on the component for forming the stop position of the movable pin, and improves the structural reliability of the compressor.

This invention discloses a variable displacement compressor flow control valve based on valve port adaptive wear compensation, belonging to the technical field of automotive air conditioning compressor control valves. It includes a bellows assembly, an electromagnetic drive assembly, a valve body with a through cavity, a valve core floating within the through cavity and having a through flow channel, and an inner valve stem floating within the through flow channel; a sealing ring three is sleeved around the outer periphery of the valve core; a valve port one is provided on the outer wall of the valve core, which can overlap with a valve port two provided on the inner wall of the through cavity; the valve body is provided with a Ps port communicating with a first cavity, a Pd port communicating with a second sub-cavity one, and a Pc port communicating with a second sub-cavity two; the electromagnetic drive assembly includes a push rod and a fixed iron core movably sleeved around the outer periphery of the push rod. This invention's variable displacement compressor flow control valve based on valve port adaptive wear compensation solves the problem of reduced compressor maximum displacement due to main valve port wear and leakage after long-term use in existing control valves.

We provide a variable displacement vane pump that allows for a wide range of full cutoff pressure adjustments from low to high pressure using a single pump without changing the spring. [Solution] The vane pump 100 includes a plurality of vanes 122 that slidably protrude from a rotor 120 that is rotatable around an axis 116, a cam ring 124 that is eccentric with respect to the axis and has an inner circumferential surface 128 that the outer peripheral ends 130 of the vanes slide against, a high-pressure spring 150 that biases the cam ring via a plunger, a low-pressure spring 154 that is at least partially inserted into a holder 152 and biases the cam ring via the holder and plunger, a stopper 156 provided on the end of the low-pressure spring opposite to the plunger side, and a pressure adjustment unit 132 that can adjust the position of the stopper from a position where the holder does not come into contact with the stopper even when the cam ring moves to a position where the stopper is in constant contact with the holder.

The present application relates to the field of variable displacement fluid machinery, and particularly relates to an asymmetric three-claw rotor and a claw type fluid machinery with the three-claw rotor, wherein the asymmetric three-claw rotor comprises a first three-claw rotor and a second three-claw rotor capable of synchronous and opposite double-rotation movement around respective rotation centers; the cross-sectional profiles of the first three-claw rotor and the second three-claw rotor are not completely identical, but each is composed of three single-claw outline curves of the same shape connected in sequence to form a planar rotationally symmetric figure. The single-claw outline curves of the first three-claw rotor and the second three-claw rotor in the present application are composed of only four curves, the outline profile is simple, the number of curves contained is less, the independent geometric parameters are less, the rotor design process is simple, and the design and manufacturing difficulty is lower.

This invention discloses an energy-saving ammonia screw refrigeration compressor unit, relating to the field of liquid variable displacement machinery. It solves the problems of low self-cleaning efficiency and easy clogging in existing ammonia screw refrigeration compressor units, leading to increased resistance and energy consumption during oil-gas transport and separation. The unit includes a base, a separation cylinder, a compression mechanism, and a separation mechanism. The compression mechanism includes a screw rotor, and the separation mechanism includes a fixed disc, a screening cylinder, a switching cylinder, a separation column, and a cleaning component. Multiple sets of rotating grooves are provided inside the switching cylinder. This invention achieves ammonia compression through the rotation of the screw rotor within the compression mechanism. During oil-gas transport, the rotation of the screening cylinder initially separates the lubricating oil, which then undergoes multi-stage separation and transport via the separation column. Simultaneously, the cleaning component provides self-cleaning for the screening cylinder and separation column, improving separation efficiency and service life, and reducing energy consumption. This device enhances the smoothness of oil-liquid separation, achieving energy savings.

This invention relates to the field of hydraulic technology, specifically to a displacement-adjusting hydraulic unit and a travel hydraulic system. The displacement-adjusting hydraulic unit acts on a hydraulic pump, which is a variable displacement pump driven by a speed-adjustable engine. It includes: a variable displacement piston configured to adjust the displacement of the hydraulic pump; a control valve configured to control the oil inlet and outlet of the variable displacement piston; and a DA valve, whose inlet X is connected to a replenishment oil source M, and whose outlet Y generates an actuation pressure proportional to the engine speed. The pilot pressure of the control valve comes from the actuation pressure generated by the DA valve, and the hydraulic oil source controlled by the control valve to be output to the variable displacement piston comes from the replenishment oil source M. This invention solves the technical problem in the prior art where the series closed-loop pump uses a combination of hydraulic direct control and a DA valve, resulting in different swing forces between the front and rear pumps due to differences in internal components, leading to a large difference in the output flow rate between the front and rear pumps, and causing high deviation in the travel machinery.

A hydraulic system (1) according to one embodiment includes a variable-displacement hydraulic motor (41), hydraulic pumps (21, 22), a plurality of pressure sensors (9), a tilt angle sensor (82), and a processing circuit (71). The pressure sensors (9) include a pair of motor pressure sensors (92, 93). The processing circuit (71) calculates an output torque of the hydraulic motor (41) on the basis of a pressure difference between an inlet pressure and an outlet pressure of the hydraulic motor (41) detected by the pair of motor pressure sensors (92, 93) and a tilt angle of the hydraulic motor (41) detected by the tilt angle sensor (82), determines the presence or absence of an abnormality in the hydraulic system (1) on the basis of the calculated output torque and the tilt angle of the hydraulic motor (41), and if there is an abnormality in the hydraulic system (1), identifies the cause of the abnormality in the hydraulic system (1) on the basis of the plurality of pressures detected by the pressure sensors (9) and the tilt angle detected by the tilt angle sensor (82).

The present disclosure relates to the technical field of hydraulic servo motor, and particularly provides a control method of a hydraulic servo motor based on swash plate torque compensation, which comprises a swash plate disturbance compensation term module, a linear state observer module, a virtual control law module and a control law calculation module, the swash plate disturbance compensation term contains the average disturbance of the swash plate torque, and is involved in the calculation of the final control law through the virtual control law, so as to realize accurate compensation of the torque disturbance, the piston displacement of the variable mechanism is involved in the calculation of the linear observer, and is used as a robust compensation term of the control law to realize compensation of the unmodeled disturbance such as friction and parameter error, and finally the output instruction u is transmitted to the variable servo valve for controlling the movement of the variable mechanism. The present disclosure can solve the problems of poor displacement control robustness and low control accuracy of the hydraulic servo motor in the variable displacement hydraulic servo system when facing periodic disturbance and unknown system state.

A system capable of simultaneously purifying water and generating electricity includes one or more prime mover, a variable displacement hydraulic pump, a first variable displacement hydraulic motor hydraulically coupled to the variable displacement hydraulic pump, a second variable displacement hydraulic motor hydraulically coupled to the variable displacement hydraulic pump, and a controller having one or more processors adapted to execute software maintained in one or more non-transient memories, the controller adapted to control the pump, the first motor, and the second motor, wherein the first motor output shaft is adapted to be coupled to an electrical generator to thereby generate electricity, and wherein the second motor output shaft is adapted to be coupled to a water purification pump to draw unpure water from a feed supply and provide the unpure water to a water purification system to thereby generate permeated water and separated impurities.

This application provides a variable displacement oil pump, including a housing with a cavity. A rotor is movably mounted in the cavity and connected to a pump shaft, thereby enabling the rotor to rotate. A pump disc is also movably mounted in the cavity, with an inlet pipe and an outlet pipe for oil input and discharge. A first protrusion and a second protrusion are respectively provided on both sides of the housing, and an elastic support component and a screw component are respectively mounted thereon. When the pump disc is located in the cavity, it abuts against the contact pad of the elastic support component and the pad connected to the screw component. When oil enters through the inlet pipe, it is discharged towards the outlet pipe with the cooperation of the rotating rotor. The gap between the inner wall of the pump disc and the rotor forms the oil flow area. By rotating the screw component, the screw component can drive the pump disc to move, thereby adjusting the oil flow gap and thus changing the oil displacement.

This invention discloses a hydraulic steering device and an all-terrain vehicle hydraulic steering system. The steering gear 6 of the hydraulic steering device adjusts its displacement via a variable displacement control cylinder 9, which is controlled by an electro-proportional two-position three-way directional valve 11. The opening of the oil circuit within the electro-proportional two-position three-way directional valve 11 is controlled by an electrical signal converted from vehicle speed. When the vehicle speed increases, the displacement of the steering gear 6 decreases; when the vehicle speed decreases, the displacement of the steering gear 6 increases. The outlet of the variable displacement pump 1 is connected to a steering oil circuit switching valve 7 via a one-way valve 4. The steering oil circuit switching valve 7 connects the steering gear 6 and the steering cylinder 3. This invention addresses the problem of easy rollover and fishtailing in hydraulically driven all-terrain vehicles at high speeds by providing a hydraulic steering control system that links vehicle speed and steering wheel angle control, adjusting the control ratio of steering wheel angle and overall vehicle angle according to vehicle speed.

Disclosed are a hybrid power system, a control method, a computer system, a program product, and a vehicle. The hybrid power system includes: an engine, a motor generator, a gearbox, a variable displacement hydraulic pump, and a battery electrically connected to the motor generator, where the gearbox includes a first transmission shaft, a second transmission shaft, a first gear disposed on the first transmission shaft, and a second gear disposed on the second transmission shaft, where the first gear is coupled to the second gear; a rotation shaft of the motor generator is coupled to one end of the second transmission shaft; and the engine is connected to the variable displacement hydraulic pump via the first transmission shaft through 1:1 transmission. The present disclosure can simplify the structure and control of the hybrid power system, improve fuel economy, and reduce costs.

This invention discloses a high-power variable amplitude speed pump, belonging to the field of water pump technology. It includes a pressure chamber, an impeller, a rotating shaft, and an inlet pipe. The impeller is symmetrical about the rotation axis. Its key feature is the inclusion of movable and fixed guide vanes, both housed within the pressure chamber. The movable guide vanes are distributed around the outer periphery of the impeller and rotate around the rotation axis to adjust their opening. The fixed guide vanes are distributed around the outer periphery of the movable guide vanes. The impeller includes an upper cover plate, a lower cover plate, and blades. The blade thickness cross-section is eccentrically distributed in a tadpole shape. The impeller inlet is connected to the outlet of the inlet pipe, and the impeller outlet is connected to the inlet of the movable guide vanes. By adding movable guide vanes and a specifically structured impeller, this invention enables the entire impeller to adapt to changes in fluid flow under different power levels, significantly increasing the power adjustment range of the variable speed pump. This, in turn, facilitates the application of multi-energy complementary systems involving wind, solar, hydro, and storage.

The present invention provides an engine oil supply system that can stabilize hydraulic pressure and control it to an appropriate pressure. [Solution] The system includes a variable displacement oil pump 81, an oil pressure detection unit 50a that detects the oil pressure in the oil supply passage 5, an oil control valve 84 that changes the amount of oil discharged, a mechanical relief valve 81z that discharges a portion of the oil outside the oil supply passage when the discharge oil pressure of the oil pump exceeds the upper limit pressure, a temperature detection unit 50b that detects the engine temperature, and a control unit 60. If the temperature detected by the temperature detection unit is above the set temperature, the oil control valve is feedback controlled so that the oil pressure detected by the oil pressure detection unit matches the target oil pressure. If the temperature detected by the temperature detection unit is below the set temperature, feedback control is prohibited and the oil control valve is controlled so that the amount of oil discharged is maximized.

This invention discloses a speed-sensitive power control hydraulic system and control method for a skid steer loader, including an engine assembly, a travel hydraulic system, and a pilot hydraulic control system. The travel hydraulic system includes a variable displacement pump and a travel motor. The pilot hydraulic control system includes a pilot pump, a control handle, and a variable displacement control pushrod. The pilot pump supplies oil to the variable displacement control pushrod via the control handle; the variable displacement control pushrod controls the variable displacement pump. A power limiting valve connected to an oil tank is installed on the oil line between the control handle and the variable displacement control pushrod. The engine assembly includes a speed sensor connected to the machine controller. The machine controller is connected to the power limiting valve. The control method calculates the engine output power by measuring the engine speed, obtains the power of the working hydraulic system, and limits the upper limit of the power of the travel hydraulic system to ensure that the power demand of the working hydraulic system is prioritized. Beneficial effect: This invention achieves anti-stalling effect in the skid steer loader through the power limiting valve.

This variable displacement supercharger comprises a turbine impeller, a turbine housing that houses the turbine impeller and includes a scroll flow passage provided around the turbine impeller, a variable nozzle mechanism that adjusts an opening degree of a nozzle flow passage by which the scroll flow passage and the turbine impeller communicate, and an actuator connected to the variable nozzle mechanism. The variable nozzle mechanism is provided with a drive lever located outside the turbine housing and a link pin connected to the drive lever. The actuator is provided with a drive rod rotatably connected to the link pin, the drive rod has a resin part containing a resin material, and the drive lever is located between the turbine housing and the drive rod.

The present invention relates to a variable capacity swash plate type compressor control method and a variable capacity swash plate type compressor controlled by the method, comprising: a first determining step of determining the possibility of the presence of liquid refrigerant inside the compressor at the start of the compressor; a first operating step of applying power to the field coil assembly and not applying current to the electronic control valve in the case where it is determined that the possibility of the presence of liquid refrigerant is high; a second determining step of comparing the elapsed time since the operation of the above first operating step with a reference time determined in advance; and a second operating step of maintaining the power applied to the field coil assembly in the above first operating step and applying current to the electronic control valve in the case where it is determined that the above elapsed time is greater than or equal to the above reference time.

This invention discloses a machine slewing system and control method with auxiliary heat dissipation. The input end of the PTO device is connected to the power take-off port of the engine or main pump, and the output end of the PTO device drives the rotation of a variable displacement piston pump. The inlet of the variable displacement piston pump draws oil from the hydraulic oil tank, and the outlet of the variable displacement piston pump is connected to the P port of the reversing valve assembly. The reversing valve assembly, according to the control signal output by the controller, redirects the hydraulic oil to the slewing attachment and then back to the hydraulic oil tank via the radiator, or redirects the hydraulic oil to the radiator and back to the hydraulic oil tank. The controller receives signals from the instruments, control handle, and oil temperature sensor, performs mode judgment, and outputs corresponding control signals to the variable displacement piston pump and the reversing valve assembly. This invention achieves on-demand flow supply, improving the adaptability of the machine; it provides auxiliary heat dissipation, effectively reducing the risk of high hydraulic oil temperature. It meets the machine's slewing requirements while accelerating hydraulic oil circulation, achieving an auxiliary heat dissipation effect.

The present disclosure relates to a refrigeration system and an air conditioner. The refrigeration system comprises: a compressor comprising an outlet, an inlet and a variable displacement port, the compressor having a first displacement and a second displacement; and a control valve comprising a first interface, a second interface and a third interface, the first interface being in communication with the outlet, the second interface being in communication with the inlet, and the third interface being in communication with the variable displacement port; the control valve is configured to operatively communicate the first interface with the third interface to enable the compressor to operate at the first displacement, or to operatively communicate the second interface with the third interface to enable the compressor to operate at the second displacement. The control valve is configured to operatively switch the flow path connection state to enable the compressor to switch operation between the first displacement and the second displacement, thereby simplifying the structure and reducing the complexity of the system; and the displacement adjustment of the compressor is realized through the switching action of the control valve, thereby avoiding the risk of misoperation caused by the coordinated control of multiple components and improving the stability and reliability of the system operation.

The utility model discloses a kind of manual variable plunger pumps, it includes cylinder body being rotatably arranged in pump shell, multiple plunger are slidably arranged in cylinder body, plunger is attached to thrust plate by spring, thrust plate is installed on the boss of variable head by thrust ball bearing, variable head is slidably arranged in back cover, variable head is equipped with first camber along its sliding direction, back cover is equipped with the second camber matched with first camber, variable head is equipped with connecting rod between two first cambers, connecting rod is connected with adjusting rod by ball hinge, adjusting rod is slidably arranged in back cover, adjusting rod is connected with position moving mechanism. Compared with prior art, the utility model is simple in structure, plunger rotation drives thrust plate to rotate around boss, thereby completing oil absorption and oil pressing. Position moving mechanism drives adjusting rod to move, drives connecting rod to move, moving rod drives the first camber of variable head to slide along second camber, so as to adjust the included angle of boss and cylinder body, to adjust the size of displacement of plunger pump in this way.

A hybrid power system, control method, computer system, software product, and vehicle are disclosed. The hybrid power system includes: an engine (1), an electric generator (2), a gearbox (3), a variable displacement hydraulic pump (4), and a battery (5) electrically connected to the electric generator (2); wherein the gearbox (3) includes a first drive shaft (6), a second drive shaft (7), a first gear (8) disposed on the first drive shaft (6), and a second gear (9) disposed on the second drive shaft (7), wherein the first gear (8) is coupled to the second gear (9); the rotating shaft of the electric generator (2) is coupled to one end of the second drive shaft (7); and the engine (1) is connected to the variable displacement hydraulic pump (4) via the first drive shaft (6) through a 1:1 transmission. This disclosure simplifies the structure and control of the hybrid power system, improves fuel economy, and reduces costs.

The utility model provides a stable operation variable pump which comprises a pump body, a pump cover, a rotating pin and a variable sliding block, the variable sliding block is arranged in a cavity of the pump body, a rotor cavity is formed in the middle of the variable sliding block and used for containing a rotor assembly, and an arc groove and a protruding block are arranged on the periphery of the variable sliding block. The rotating pin is fixedly installed on the pump body and corresponds to the arc groove of the variable sliding block so that the variable sliding block can swing around the rotating pin, a tension spring is arranged between the protruding block and the side wall of the cavity of the pump body, and connecting mechanisms are arranged on the protruding block and the side wall of the cavity of the pump body and used for fixing hooks at the two ends of the tension spring respectively. Due to the fact that the tension spring is fixed to a connecting mechanism of the protruding block and the side wall of the pump body through the hook, front-back, left-right and up-down translation of the spring can be limited, center rotation, overturning and horizontal rotation of the spring can be limited, the problem that the spring slides due to the too large deflection angle in the running process can be greatly solved, the reliability of the spring is improved, and the service life of the spring is prolonged. And the operation stability of the variable pump is ensured.

The present invention provides a hydraulic system (1) comprising: a hydraulic actuator (5); a control valve (4) connected to the hydraulic actuator (5); and a variable displacement hydraulic pump (21) connected to the control valve (4) via a pump line (31). The minimum discharge flow rate of the hydraulic pump (21) is set to be greater than zero. Further, the hydraulic system (1) comprises: a drain valve (34) provided on a drain line (33); actuator pressure detectors (81, 82) for detecting actuator pressure; and a control device (7). The control device (7) includes a processing circuit (71) that controls the drain valve (34) to have an opening area corresponding to the inflow flow command and the actuator pressure detected by the actuator pressure detectors (81, 82) when the inflow flow command to the hydraulic actuator (5) is greater than zero and less than the minimum discharge flow rate.