94 results about "Axial piston pump" patented technology

The invention relates to the technical field of hydraulic element testing, in particular to a high-pressure axial plunger pump bearing bush pair interface friction and oil film characteristic testing device. According to the device, 10-60 MPa adjustable oil pressure is provided through the hydraulic pipeline unit, the driving unit achieves power loading and friction monitoring through a servo motor and a torque sensor, the main body unit conveys high-pressure oil to a bearing bush contact face through an in-shaft cross-shaped oil duct structure to form a static pressure supporting oil film, and a micron-sized oil film sensor is integrated; the oil detection unit monitors oil parameters, and the signal acquisition and control unit performs closed-loop regulation on oil supply flow, motor rotating speed and swash plate load based on oil film thickness, torque and pressure signals. The method has the beneficial effects that 0.2 mu m-level oil film fracture identification is realized, the occurrence rate of dry friction is reduced by 82% through a cross-shaped oil duct in the shaft, and the oil film fluctuation rate lt is cooperatively controlled through multiple parameters; + / -3%, the safety interlocking mechanism responds abnormally within 0.3 s.

The invention provides an axial plunger pump fault diagnosis method suitable for marking sample scarcity conditions, and belongs to the technical field of fault diagnosis, aiming at performance degradation caused by marking sample scarcity in axial plunger pump fault diagnosis of a deep learning model. According to the method, the dynamic pressure simulation model is constructed under the condition that the marked samples are scarce, and unmarked samples can be supplemented by generating high-quality simulation samples; a model migration framework and a semi-supervised multi-adversarial pre-adaptation strategy are constructed, and the generalization ability of the model in a target domain task is improved. Experimental results show that high-quality simulation samples are generated, and the plunger pump fault sample recognition rate under the condition that marked samples are scarce is increased.

The present invention relates to a rotary tilting plate axial piston pump (1) for pumping liquids, comprising: a head (25); a plurality of cylinders (30) formed in the head (25) in a number greater than two, the plurality of cylinders (30) having axes (C) parallel to each other and arranged radially about a common axis (A) parallel to the axes of the cylinders; a plurality of pistons (75) each piston slidably inserted into a corresponding cylinder (30) of the plurality of cylinders (30) for pumping liquids; and a plurality of delivery pipes (145) formed in the head (25), each of the plurality of delivery pipes (145) extending directly from the corresponding cylinder (30) to a corresponding delivery valve (120) and arranged transversely to the axis (C) of the corresponding cylinder. The head (25) has a first side (61) and a second side (62), the second side (62) being opposite to the first side (61) with respect to an imaginary orthographic plane (S), the imaginary orthographic plane (S) including the common axis (A) and parallel to the axis (C) of the cylinder (30), wherein the plurality of cylinders (30) includes a first arranged cylinder and a second arranged cylinder, the axis (C) of the first arranged cylinder being between the first side (61) and the imaginary orthographic plane (S), and the axis (C) of the second arranged cylinder being between the second side (62) and the imaginary orthographic plane (S). A delivery conduit (145) extending from a cylinder (30) in the first arranged cylinder extends from the respective cylinder (30) toward the first side (61), and a delivery conduit extending from a cylinder in the second arranged cylinder extends from the respective cylinder (30) toward the second side (62).

This invention discloses an axial piston pump with a main shaft driven at a constant velocity to rotate an inclined cylinder assembly. The pump includes a pump body, a main shaft, a turntable on the main shaft, ball joints, and a cylinder mounted on the outer side of each ball joint. A piston mechanism is located between the cylinder and the turntable. A distribution plate is located on the outer side of the cylinder, and inlet / outlet flow channels are located inside the pump body. Multiple curved groove raceways or multiple straight groove raceways are located on the outer surface of the ball joints. Corresponding raceways are provided between the cylinder and the multiple curved groove raceways or multiple straight groove raceways. Torque is transmitted through the rolling contact of balls within the raceways, forming a fixed or telescopic ball cage type constant velocity universal joint transmission mechanism, achieving constant velocity drive of the inclined cylinder rotation by the main shaft. Because the components at both ends of the piston, namely the turntable and the cylinder, rotate at completely equal and synchronous speeds, the "floating" motion of the float in a float pump can be effectively solved, making the internal rotating components operate more stably under high-speed driving conditions and reducing friction and wear problems.

The invention discloses a stirring loss testing device for a rotating assembly in a high-speed plunger pump, and relates to the technical field of hydraulic elements, a simulation pump and a driving motor are installed on an inclinable platform through a connecting piece, a torque sensor is assembled on a cylinder body shaft of the simulation pump, and the simulation pump and the driving motor are in transmission connection through a coupler. The oil storage module and the stirring loss test module are isolated through the double-lip framework oil seal with the spring, and interference of a flow distribution pair is stripped; the inner wall of a plunger hole is pushed through a push rod in a cylinder hole of a cylinder body shaft, a traditional mode that a plunger is in direct contact with the cylinder hole is replaced, an oil way in the cylinder hole of the cylinder body shaft is adopted for oil injection lubrication, and measurement interference of a plunger pair is effectively removed; oil is injected to a spherical hinge joint by means of an oil path in the push rod, and the piston shoe pair is always soaked in the oil to realize sufficient lubrication by matching with the oil collection function of the inclinable platform and the swash plate with the oil storage tank, so that the measurement interference of the piston shoe pair is removed.

The invention relates to a hydraulic control circuit (11) for an orienting actuator (14) for orienting fan blades of a turbojet engine, the circuit (11) comprising an oil reservoir (17) and an axial piston pump (18) comprising a tiltable plate (23), as well as a control chamber (24) and a compensation chamber (27) for increasing the tilt of the plate (23) when the pressure inside these chambers increases, the pump (18) being supplied by the reservoir (17) and having its outlet configured so as to be able to be connected by a supply line (19) to one of the chambers (12, 13) of the orienting actuator (14), the other chamber of the orienting actuator (14) being connected to the reservoir (17), this control circuit comprising a valve (42) controlled by a computer (FADEC), which valve (42) allows the outlet of the pump (18) to be connected to the reservoir (17) in order to deactivate this pump (18).

This invention discloses a dual-constraint incremental axial piston pump fault diagnosis method based on sample selection and playback, belonging to the field of fluid pressure and electrical digital data processing. The method includes: acquiring fault signals at the current moment and labeling them to obtain fault samples, constructing a fault diagnosis model; merging the fault samples at the current moment with old fault samples to form an incremental dataset, where the selection of old fault samples is based on improved sample profile coefficients and thresholds; inputting the incremental dataset into the fault diagnosis models at the current and previous moments respectively, further calculating the total incremental loss function composed of cross-entropy loss, cosine contrast loss, and surrogate loss, updating the model parameters through backpropagation until convergence, obtaining the fault diagnosis model trained at the current moment. This invention overcomes the catastrophic forgetting problem of learned fault knowledge in existing fault diagnosis models, and improves the continuous learning capability of the axial piston pump fault diagnosis model through incremental learning.

The invention provides a fixed clearance return stroke type high-speed axial plunger pump, and relates to the field of axial plunger pumps, the fixed clearance return stroke type high-speed axial plunger pump comprises a shell and a main shaft capable of rotating in the shell, the main shaft drives a cylinder body and an impeller to rotate, an axial channel is arranged in the cylinder body, a pre-tightening spring is arranged in the axial channel and provides pre-tightening force for a return stroke disc, and a plunger body can reciprocate in the axial direction. The end part of the plunger body is matched with the sliding shoe to slide on the swash plate, and a return stroke assembly is further arranged and comprises a return stroke plate, a fixed gap pressing plate and a fixing device; the return plate is limited between the fixed-gap pressing plate and the sliding shoe and arranged with the fixed-gap pressing plate in a spaced mode, and the fixing device is used for fixing the fixed-gap pressing plate to the swash plate. The return stroke assembly with the fixed gap is adopted, the problem that the sliding shoe excessively inclines and even disengages in the return stroke process is avoided, meanwhile, the return stroke disc utilizes the pre-tightening force of the center spring, and it is ensured that the sliding shoe is flexibly attached to and sealed with the swash plate under the low-speed working condition; the fixed gap pressing plate balances the centrifugal overturning moment of the sliding shoe through physical limiting under the high-speed working condition.

The application provides an axial plunger pump flow distribution disc and cylinder gap self-adapting adjusting device, which comprises a cylinder, a flow distribution disc, a gap detecting mechanism and an adjusting control mechanism; the gap detecting mechanism comprises a magnetic component, a magnetic field generator and a magnetic flux detecting sensor; the magnetic component is arranged on the cylinder, and the magnetic field generator and the magnetic flux detecting sensor are arranged on the flow distribution disc; the adjusting control mechanism is connected with the magnetic flux detecting sensor and the magnetic field generator respectively; the magnetic flux detecting sensor is used to detect the magnetic field strength change between the magnetic component; the adjusting control mechanism can obtain the gap between the cylinder and the flow distribution disc through the magnetic field strength change, control the magnetic field generator to generate different magnetic fields, and the magnetic field generator can interact with the magnetic component to adjust the gap between the cylinder and the flow distribution disc. The technical scheme can improve the wear and leakage problems, and improve the service life and performance of the pump.

The application provides an analysis method for an axial plunger pump with bearing faults under a liquid working condition, comprising the following steps: constructing a geometric structure model of an equation axial plunger pump rotor system to obtain a fluid acting force equation; decomposing a working medium mass into a rotor additional mass, a shell additional mass and a liquid coupling mass, and combining the fluid acting force equation with a friction force, a centrifugal force and a mass unbalance force equation of a cylinder body assembly to construct an axial plunger pump rotor dynamics equation; constructing a local defect fault dynamics model of a roller bearing to calculate an angular position of roller movement, and when the roller enters a defect, acquiring a time-varying displacement excitation and a time-varying contact stiffness excitation to be assembled into the dynamics equation to obtain a dynamics model with bearing faults; and analyzing the dynamics model with bearing faults to obtain critical rotating speeds of each fault element. By implementing the application, the analysis and calculation results are closer to actual values, and the vibration characteristic analysis and dynamic design work can be better carried out.

The invention provides an auxiliary dismounting device and method for a plunger pump. The auxiliary dismounting device comprises a walking mechanism used for movably supporting the whole device. A rotary V-shaped table and a movable lifting V-shaped table are arranged on a base bottom plate of the walking mechanism along the central axis; and a hoisting transfer frame is arranged above the walking mechanism. The dismounting device can be used for horizontally hoisting the axial plunger pump, so that a transmission shaft of the plunger pump is horizontally suspended, and the pump can be conveniently dismounted from an oil pump motor set; the rotary V-shaped table of the device can rotate by a certain angle, the movable lifting V-shaped table can vertically lift and move horizontally and longitudinally, and the two V-shaped tables are used in cooperation to stably bear different types of plunger pumps. The lifting transfer frame can achieve double-lifting-point horizontal lifting of the plunger pump, traditional tripod chain block single-lifting-point lifting is replaced, the lifting transfer frame is safer and more stable, and the lifting transfer frame can further transfer the detached plunger pump to the V-shaped table. The front side of the base bottom plate is designed to be a U-shaped notch which can be used for auxiliary disassembly of the plunger pump in a narrow space.

The invention discloses a double-rotation-direction axial plunger pump and a valve structure. The problem that in the prior art, a symmetrical valve plate of a double-rotation-direction axial plunger pump cannot achieve pre-boosting is solved. The double-rotation-direction axial plunger pump comprises a shell, a cylinder body, a valve plate, a swash plate and a plurality of plungers, the valve plate is arranged in the shell and located at one end of the cylinder body, a first oil suction port and a second oil suction port are further formed in the valve plate, a first included angle is formed between the first oil suction port and the center line of the valve plate, and a second included angle is formed between the second oil suction port and the center line of the swash plate. A first included angle is formed between the first oil suction port and the center line of the valve plate, a second included angle is formed between the second oil suction port and the center line of the valve plate, and the first included angle is equal to the second included angle, so that when the double-rotation-direction axial plunger pump rotates, one of the first oil suction port and the second oil suction port can be opened for auxiliary oil suction; and the other closed side can be used for pre-boosting the plunger cavity, so that pre-boosting on the valve plate of the double-rotation-direction axial plunger pump becomes possible.

The invention relates to an axial piston machine (1), in particular an axial piston pump, with a piston drum (2) that can be driven in at least one direction of rotation (22), with cylinders (10) arranged in the piston drum which are spaced apart from each other in the direction of rotation by a piston pitch (24) and are designed to slidably receive pistons (4) having a piston diameter (34), wherein longitudinal axes (16) of the pistons are arranged parallel to each other on a pitch circle (28) having a pitch circle diameter (26), and wherein: 0.377 z K ≤ (DT, K d K) ≤ 0.4948 z K, where D T,K the pitch circle diameter, d K the piston diameter and z K The number of pistons corresponds to this. Such an axial piston pump is quiet in operation yet compact.

This invention relates to a method and computer program for setting and / or starting the drive system of a molding apparatus, particularly an extruder, to a preset operating speed. Furthermore, this invention relates to a corresponding molding apparatus. The drive system (100) comprises a hydraulic piston cylinder unit (130), which includes a punch (132) for extruding material in the molding apparatus through a die (220). The piston cylinder unit (130) is connected to a pump assembly (110) via a hydraulic network (120). The pump assembly (110) includes at least one axial piston pump and an electric motor (M1) assigned to it for delivering hydraulic fluid to the piston cylinder unit via the hydraulic network. In order to save energy during the extrusion time of the forming equipment while the axial piston pump and the electric motor driving it are running, the method according to the invention specifies that the swing angle (α1) of the first axial piston pump (P1) and the rotational speed (n1) of the first electric motor (M1) and (if necessary) the swing angle (α2...) of the additional axial piston pumps are set or changed, so as to achieve the preset target operating speed (Vsoll) with the lowest possible overall efficiency.

The invention discloses a digital axial plunger pump / motor, and belongs to the field of hydraulic elements. The device comprises a fixed cylinder body, a transmission shaft, an inner ring swash plate, an outer ring swash plate and a plunger assembly, the cylinder body is provided with double rows of plunger cavities, and the transmission shaft is supported in the center of the cylinder body through a bearing. The inner ring swash plate and the outer ring swash plate are rigidly connected with the shaft, working face contours of the swash plates are symmetrical curved surfaces and provided with guide grooves, the plungers are arranged in plunger cavities, reset springs are arranged at the front ends of the plungers, guide balls are arranged at the tail ends of the plungers, and the guide balls are in rolling contact with the swash plate guide grooves. When the pump is used, the transmission shaft drives the swash plate to rotate, the plunger moves linearly in a reciprocating mode through the curved surface profile, and the single plunger completes two times of oil discharge and two times of oil suction every time the swash plate rotates by a circle. When used as a motor, the digital valve system controls high-pressure oil to enter the plunger cavities to push the plungers, the balls roll along the curved surface of the swash plate to convert linear motion into continuous rotation of the swash plate and the transmission shaft, the single plunger completes two times of oil inlet and two times of oil return every time the single plunger rotates, and efficient conversion is achieved.

The invention relates to a hydraulic control circuit (11) for a fan blade pitch control actuator (14) of a turbojet engine, comprising an oil reservoir (17), an axial piston pump (18) having a tilting swashplate (23) and a control chamber (24) and a compensation chamber (27) to increase the tilt of the swashplate (23) when the pressurization of these chambers increases, the pump (18) being supplied by the reservoir (17) and having its outlet configured to be connected by a supply line (19) to one of the chambers (12, 13) of the pitch control actuator (14), the other chamber of the pitch control actuator (14) being connected to the reservoir (17), this control circuit comprising a valve (42) controlled by a computer (FADEC) allowing the outlet of the pump (18) to be connected to the reservoir (17) in order to deactivate this pump (18). Figure for the abbreviation: Figure 2

The invention relates to a hydrostatic axial piston machine (1), in particular an axial piston pump, with an adjustable displacement volume, which is operated in a closed circuit, wherein the displacement volume is adjustable by means of an actuating device (4), wherein the actuating device (4) comprises a pressure-cutting function (16) which has a pressure-cutting valve (15) which is actuated depending on the pressure at a first pressure port (A) of the axial piston machine (1) and depending on the pressure at a second pressure port (B) of the axial piston machine (1). The pressure-cutting valve (15) is operatively connected to a first actuating piston (35a), which is actuated by the pressure at the first pressure port (A), and to a second actuating piston (35b), which is actuated by the pressure at the second pressure port (B).

The utility model relates to swash plate type axial plunger pump technical field, especially a kind of high-speed axial plunger pump, including shell, transmission shaft, variable mechanism and rotary assembly, rotary assembly includes the cylinder body, plunger, sliding shoe, swash plate support, ball hinge, return disc, return spring and flow distribution disc of assembly. Among them, transmission shaft and cylinder body adopt drum spline connection of circular arc type, avoid the problem that cylinder body overturns and is stuck;Sliding shoe and plunger adopt ball head articulation, plunger can wrap around the ball head rotation of sliding shoe, thereby reduce the distance of sliding shoe centroid to ball hinge center, reduce the centrifugal overturning moment of sliding shoe, improve the anti-overturning capacity of sliding shoe;Plunger is coaxially provided with cylindrical annular cavity, can reduce mass, reduce the influence of centrifugal force to sliding shoe and cylinder body;And the bottom surface of sliding shoe is plated with wear-resistant layer, can reduce the wear degree of sliding shoe bottom surface. Overall improve service life, avoid the overturning failure problem of sliding shoe and cylinder body in high-speed operation process.

The utility model discloses a height and angle adjustable test fixture for a plunger pump, and belongs to the technical field of plunger pumps, the plunger pump test fixture comprises a fixed frame, an adjusting plate, a rotating plate and a clamping jaw mechanism, the adjusting plate comprises a first plate body and an adjusting part, and the first plate body is provided with a first avoiding hole; the rotating plate comprises a second plate body, a rotating shaft and an adjusting disc, the rotating shaft is connected with the second plate body, a second avoiding hole is formed in the second plate body, the rotating shaft is rotatably installed on the first plate body, and the second plate body is provided with a straight shaft position and a plurality of inclined shaft positions; a containing groove is formed in the adjusting part, the end, close to the containing groove, of the rotating shaft is connected with an adjusting disc, multiple positioning grooves are formed in the side wall of the containing groove, and a clamping part is arranged on the periphery of the adjusting disc; the clamping jaw mechanism comprises a plurality of clamping jaw assemblies. The plunger pump test fixture can respectively clamp the swash plate type axial plunger pump and the inclined shaft type axial plunger pump when the second plate body is in the straight shaft position and the inclined shaft position, so that the universality of the plunger pump test fixture is effectively improved.

A balanced axial piston pump for a hydraulic tool is specified. The balanced axial piston pump comprises a camshaft, cam followers, a stroke block, a spring, a pump piston, a piston chamber, and a distributor. The rotation of the camshaft simultaneously drives the radial movement of the cam followers. The radial movement of the cam followers causes a linear movement of the stroke block along the axis of the hydraulic tool. The spring presses the piston against the stroke block, keeping the piston in contact with it. The linear movement of the stroke block moves the piston linearly within the piston chamber, thereby pumping oil and providing hydraulic power.

The present disclosure relates to the technical field of plunger pump, and provides an axial plunger pump with good self-priming performance, which comprises a pump shell assembly, a base, a distribution disc, a swash plate and a cylinder body, the base is provided with a medium input channel and a medium output channel, the distribution disc is provided with a first through groove and a second through groove, the cylinder body is provided with a plurality of plunger holes, a sliding plunger is slidingly arranged in the plunger hole, and the sliding plunger is used for pumping medium from the medium input channel to the medium output channel after sliding; the wear-resistant ring is provided with a plurality of sliding parts and friction parts, the sliding parts are slidingly arranged in the plunger holes one by one, the sliding direction of the sliding part is parallel to the sliding direction of the sliding plunger, after the sliding part slides, the friction part is driven by the sliding part to abut against the top of the distribution disc away from one end of the sliding part, the sliding part is provided with a third through hole in communication with the plunger hole, and the friction part is provided with a plurality of distribution windows in one-to-one communication with the third through hole. Through the above technical scheme, the technical problem that the distribution disc needs to be frequently overhauled and replaced in the prior art is solved.

The swash plate type axial plunger pump shell structure comprises a pump body and a shell, a flow channel is formed between the pump body and the shell, a front end cover and a rear end cover are arranged at the two ends of the shell, four sets of first through holes are formed in the front end cover in the circumferential direction, a first cover plate is installed on the outer surface of the front end cover, and four sets of second through holes are formed in the rear end cover in the circumferential direction; a second cover plate is installed on the outer surface of the rear end cover, and Venturi modules are installed at the positions, located on the front end cover and the rear end cover, in the flow channel. The first cover plate and the second cover plate which are synchronously opened and closed are arranged at the two ends of the shell, the Venturi module in the flow channel is combined, pulse type forced convection heat dissipation is achieved, when the first cover plate and the second cover plate are opened, external cold air is accelerated through the Venturi module to form high-speed low-pressure airflow, convection heat exchange on the surface of the pump body is strengthened, and the heat dissipation efficiency is improved. And when the first cover plate and the second cover plate are closed, air in the flow channel is heated and pressurized, energy is stored for next airflow injection, and an efficient heat circulation export mechanism is formed.

The invention belongs to the technical field of plunger pump vibration reduction, and discloses an axial plunger pump swash plate main shaft device and a dynamic balance vibration reduction method thereof. The device comprises a main shaft, a main shaft rotating assembly and a balancing weight, the main shaft is provided with a balancing weight hole, an inclined face and an inclined shaft section, and the dynamic balance vibration reduction method of the device comprises the steps that mass data of the main shaft rotating assembly of the axial plunger pump are collected; the unbalanced inertia force of the main shaft rotating assembly is calculated, and parameters and positions of a counterweight hole and a counterweight block are determined; unbalanced radial force is calculated through finite element simulation; parameters of the balancing weight and the balancing weight hole are optimized; and carrying out manufacturing and processing based on the optimized parameters, carrying out a dynamic balance test, and verifying whether a test result is within a target range or not. According to the axial plunger pump, a device does not need to be additionally installed on the axial plunger pump, the radial and axial vibration phenomena caused by mass eccentricity can be eliminated only by calculating and optimizing parameters of the balance weight hole and the balance weight block on the main shaft, and the purposes of reducing cost, improving the vibration reduction effect and facilitating operation are achieved.

The invention provides an axial plunger pump cylinder overturning angle prediction method and system based on a physical information neural network, and belongs to the field of fluid pressure and the field of electric digital data processing. According to the method, the oil pressure-cylinder overturning angle mapping model of the axial plunger pump is established, the pressure change and the cylinder overturning angle are associated, and physical consistency constraint is provided for a physical information neural network; meanwhile, selecting a bidirectional long-short-term memory network as a core prediction model, and jointly introducing'data loss + physical loss' into a loss function to ensure that the predicted cylinder overturning angle meets a mechanical equation and experimental data at the same time; and finally, on the premise that the structural integrity of the pump body is not damaged, a technical path for accurately predicting an unmeasurable posture in a non-intrusive manner is realized through measurable pressure signals. According to the method, early warning can be provided at the initial stage of overturning abnormity, instability and abrasion aggravation of a flow distribution pair can be avoided, and therefore the reliability and the whole-life periodic performance of aviation hydraulic equipment are improved.

The present application relates to a kind of axial plunger pumps.The technical problems of high machining precision requirement, high machining cost, short service life and high maintenance cost of existing axial plunger pump are solved.The axial plunger pump of the present application comprises a pump cover shell, a pump cavity shell, a flow distribution disc, a rotor, an oil suction nozzle and an oil discharge nozzle;the flow distribution disc is provided with an oil suction flow channel and an oil discharge flow channel;the pump cover shell is provided with an oil suction hole and an oil discharge hole;the oil suction flow channel comprises a cylindrical oil suction hole, a first transition hole and a first rotor connecting hole;the small end of the first transition hole is communicated with the cylindrical oil suction hole, and the large end is communicated with the first rotor connecting hole;the oil discharge flow channel comprises a cylindrical oil discharge hole, a second transition hole and a second rotor connecting hole;the cylindrical oil discharge hole, the second transition hole and the second rotor connecting hole are respectively the same structure as the cylindrical oil suction hole, the first transition hole and the first rotor connecting hole;the cylindrical oil suction hole is sealingly connected with the oil suction hole through the oil suction nozzle;the cylindrical oil discharge hole is sealingly connected with the oil discharge hole through the oil discharge nozzle.

The utility model relates to the technical field of plunger pumps, in particular to a closed type axial plunger pump swing frame emergency centering system which comprises a closed type plunger pump, and the closed type plunger pump comprises a swing frame. Comprising a variable piston assembly, the variable piston assembly comprises a variable piston, a cavity a is formed in the left side of the variable piston, a cavity b is formed in the right side of the variable piston, and a piston spring abutting against the front end of the variable piston is arranged in the cavity b and connected with a swing frame; the cavity a is connected with an emergency middle return valve through an oil way; during electrification, control oil enters the cavity a through the emergency return valve, the variable piston is pushed to compress the piston spring rightwards, and the swing frame is driven to rotate; when power is cut off, control oil does not pass through the emergency return valve, and the piston spring pushes the variable piston leftwards to drive the swing frame to return to the zero position. Emergency centering of the swing frame is achieved in a brand new mode, so that the stability and safety of a vehicle hydraulic system under the braking working condition are optimized, and the service life of the vehicle hydraulic system is prolonged.

The present application relates to the technical field of hydraulic pressure, in particular to an axial piston pump. The axial piston pump comprises: a disc body of a distribution disc unit, which is provided with an oil discharge port and an oil suction port. The oil discharge port and the oil suction port are both arc-shaped and concentrically arranged. The inner diameter of the oil discharge port is equal to that of the oil suction port. The outer diameter of the oil discharge port is equal to that of the oil suction port. A support layer is fixedly connected with the disc body. The support layer of the distribution disc unit is provided with an oil discharge groove and an oil suction groove. The oil discharge groove is in communication with the oil discharge port. The oil discharge groove is arc-shaped and concentrically arranged with the oil discharge port. The inner diameter of the oil discharge groove is smaller than that of the oil discharge port. The outer diameter of the oil discharge groove is equal to that of the oil discharge port. The oil suction groove is in communication with the oil suction port. The oil suction groove is arc-shaped and concentrically arranged with the oil suction port. The outer diameter of the oil suction groove is greater than that of the oil suction port. The inner diameter of the oil suction groove is equal to that of the oil suction port. In this way, the problem of how to improve the overturning resistance of the piston pump cylinder under extreme working conditions is solved.

An axial piston machine has a displacement volume that is adjustable by a double-acting control cylinder, which is connected to an auxiliary pump via a fluid flow path that includes a first, a second, and a third control assembly. The transfer point is the point of the fluid flow path at which the plate-like housing part contacts the pot-like housing part. The receiving bore of the first, second, and third control assemblies are each arranged directly in the pot-like housing part. The part of the fluid flow path which is arranged downstream of the transfer point extends over its entire length directly in the pot-like housing part.

The application discloses an axial plunger pump flow distribution pair temperature in-situ testing system based on two-dimensional interpolation inversion, which comprises a hardware subsystem and a software subsystem, and the hardware subsystem and the software subsystem communicate through a serial port; the hardware subsystem is used for collecting sensor signals; the software subsystem comprises a basic configuration module, which is used for setting basic parameters and transmitting the sensor signals to a channel selection module by using the basic parameters; the channel selection module is used for selecting channels required for collecting the sensor signals and connecting a data acquisition control module; the data acquisition control module is used for controlling the software subsystem; an oil film temperature centralized display module is used for analyzing the sensor signals into temperature data and performing real-time display; an oil film temperature measuring point phase information distribution module is used for displaying the temperature data at corresponding phases; and an oil film temperature field distribution cloud picture module is used for inverting the temperature data, obtaining a matrix of the flow distribution disc temperature field and performing cloud picture display.

The invention provides a device and a method for measuring the stirring loss of each rotating component of an axial plunger pump, and relates to the technical field of hydraulic elements. Independent sealing of an oil storage movement area and a stirring loss testing area in the simulation pump is achieved, the oil storage movement area is continuously full of oil to guarantee stable lubrication, and the stirring loss testing area can flexibly switch dry type / wet type working conditions; a sealed oil storage cavity is defined by step seals A and B and the inner wall of a cylinder hole, it is guaranteed that the cylinder remaining section of a plunger is always immersed in oil, interference of a plunger pair is stripped, and the oil stirring loss deviation under the oil-free / full working condition is eliminated; an oil storage cavity is arranged in the sliding shoe with the universal wheel, oil is continuously supplied to a main ball and a ball through an oil groove B and an oil way B, the sliding shoe pair is stripped in cooperation with the three-point contact design of the main ball and 0.2 mm gap arrangement between a shell at the lower end of the sliding shoe and a swash plate, and it is guaranteed that a measurement result is highly consistent with a real working condition.