57 results about "Axial piston pump" patented technology

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 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 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 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 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.

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 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.

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.

Provided is a dynamic characteristic measurement method for a cylinder block of a non-intrusive axial piston pump. The cylinder block is the main rotating component of the axial piston pump, and the dynamic characteristic of the cylinder block is more capable of reflecting the health condition of the pump than an external characteristic. A non-contact type measurement scheme is provided so as to reduce the influence of a measurement device on the motion of the cylinder block. Cylinder block contour signals and radial displacement signals are obtained by measuring the radial displacement of two sections of the surface of the cylinder block under different working conditions in the perpendicular directions, and then the cylinder block contour signals are accurately removed from the radial displacement signals to obtain the translational and tilting motion characteristics of the cylinder block.

This application discloses a method, device, and electronic equipment for predicting vibration radiation noise of an aerospace axial piston pump, relating to the field of aerospace dynamics simulation technology. The method includes: acquiring the structural and preset operating parameters of the aerospace axial piston pump; the structural parameters include component geometric dimensions and physical property parameters; and the operating parameters are the pump's preset operating parameters. Based on these parameters, the pump's dynamic mechanism is analyzed to obtain the piston dynamics laws, including the time-varying laws of piston friction, axial displacement, axial velocity, and acceleration; a multibody dynamics model and a hydraulic model are constructed and coupled; the pump's external casing is made flexible to obtain a rigid-flexible coupling simulation model; and the rigid-flexible coupling simulation model is run to obtain the casing excitation load. The load is applied to the corresponding excitation point of the acoustic-vibration coupling model, and the sound pressure distribution of the pump's vibration radiation noise is calculated. This model is used to simulate the interaction between casing vibration and the sound field.

The invention relates to a hydrostatic axial piston machine (1), in particular an axial piston pump, with an adjustable displacement volume, wherein the displacement volume is adjustable by means of an actuating device (4), wherein the actuating device (4) comprises an actuating piston assembly (5) which has at least one actuating pressure chamber (5a; 5b), wherein the actuating device (4) comprises at least one actuating pressure valve (10a; 10b), in particular a pressure reducing valve, which is configured to generate an actuating pressure acting on the actuating pressure chamber (5a; 5b) of the actuating piston assembly (5), wherein the actuating pressure valve (10a; 10b) is connected at a first port (A1) to a control pressure supply device (11), at a second port (A2) to an actuating pressure line (15a; 15b) leading to the actuating pressure chamber (5a; 5b) and at a third port (A3) to a reservoir (16), wherein the actuating pressure valve (10a;10b) is acted upon by a control device (20a; 20b), for example a magnet, in the direction of a first control position connecting the first port (A1) with the second port (A2) and is acted upon by the actuating pressure in the actuating pressure line (15a; 15b) in the direction of a second control position connecting the second port (A2) with the third port (A3). The actuating pressure valve (10a; 10b) has a control spool (32a; 32b) arranged longitudinally displaceable in a housing bore (30) of a valve housing (31), which is provided with a longitudinal bore (50a; 50b) extending in the control spool (32a; 32b) from an end face (51a; 51b) of the control spool (32a; 32b) to a bore base (52a; 52b), wherein a cylindrical support body (55) is arranged longitudinally displaceable in the longitudinal bore (50a; 50b) and the bore base (52a; 52b) is designed as a control surface acted upon by the actuating pressure.

The invention provides a method and device for monitoring the state of a swash plate type axial plunger pump, and relates to the technical field of state monitoring and fault of mechanical equipment, and the method comprises the following steps: installing an array type sensor comprising a plurality of sensors on the back surface of a thrust plate in the swash plate type axial plunger pump, and collecting a vibration signal; the method comprises the following steps: performing segmentation processing on collected vibration signals, performing continuous wavelet transform on each segment of time domain vibration signal to generate a corresponding two-dimensional time-frequency characteristic matrix, then visualizing the matrix into a two-dimensional time-frequency diagram according to a preset mapping rule, and performing normalization processing on the two-dimensional time-frequency diagram; and performing data fusion on the normalized two-dimensional time-frequency image to obtain a fusion sample. According to the method, time-frequency domain feature decoupling is realized through wavelet transformation, a fault sensitive frequency band is focused, and multi-sensor channel features are fused by adopting a dynamic row selection strategy, so that the feature signal-to-noise ratio is greatly improved, and the overall reliability of fault diagnosis is remarkably improved.

The invention provides an axial plunger pump fault diagnosis method based on a space-time DQN model. The axial plunger pump fault diagnosis method comprises the following steps that a pressure signal sequence of key measuring points of an axial plunger pump is collected through a pressure sensor; performing time-frequency domain conversion on the one-dimensional pressure signal by using continuous wavelet transform to obtain a multi-scale time-frequency characteristic matrix and finish standardization processing; obtaining a time sequence representation vector and a space representation vector; and splicing and fusing the two types of representations in feature dimensions to form state representations, inputting the state representations into a Q network of a DQN model to output action values of various fault types, adaptively adjusting a risk penalty weight and a discount factor to construct a Bellman-based target equation, updating network parameters through Huber loss, and outputting a diagnosis result. According to the method, the time-frequency coupling characteristic of the pressure signal of the plunger pump and the dynamic uncertainty of the operation environment are considered, the time-space correlation information can be effectively captured, the diagnosis precision is high, the stability is high, the algorithm operation is efficient, and the method has good engineering practical value.

The utility model discloses a two-way high-pressure high-speed axial plunger pump with a self-suction function. The two-way high-pressure high-speed axial plunger pump comprises an external valve block, a front cover, a rear shell and a transmission shaft. According to the plunger pump, the innovative design that the non-Newtonian fluid forms a solid isolation layer under the high-speed working condition is adopted, the technical problem that abrasion of a return stroke mechanism is aggravated when the rotating speed of a traditional plunger pump exceeds 4500 rpm is effectively solved, and the service life under the high-pressure and high-speed working condition is remarkably prolonged; by optimizing the coating structures of the return balls and the ball grooves and the sealing fit of the PTFE lip-shaped sealing rings, the problem of lubrication failure caused by fluid permeation in the two-way working process is solved, and more stable power transmission performance under the two-way high-pressure working condition is achieved.

An axial piston machine includes at least one asymmetric bearing assembly rotatably supporting a swash plate. Rotation of the asymmetric bearing assembly off-set allows other elements of the axial piston machine to be arranged in locations that would otherwise be occupied by portions of the bearing assembly if a symmetric bearing assembly were used to support the swash plate. This configuration allows for a reduction in the overall package size of the axial piston machine in terms of bearing span and / or machine length. The axial piston machine can be an axial piston pump having a barrel defining a plurality of bores and having a respective piston arranged in each bore. The swash plate angle determines the displacement level of the machine.

The present invention relates to a hydraulic device, in particular an axial piston machine, comprising a first and a second component which are slidably in contact with one another. In the device, a sliding surface (4) of the first and / or the second component is provided with an oleophilic surface structure (5, 6, 7) which produces a contact angle (θ0) of less than 90° for the droplet contour of an oil droplet (1, 2, 3), wherein the contact angle is the angle between a tangent applied to the droplet contour on the sliding surface (4) at the interface between the droplet surface and the sliding surface (4) when the oil droplet wets the horizontally oriented sliding surface (4), and wherein the droplet contour is the contour of an oil droplet (1, 2, 3) which it assumes when it wets the horizontally oriented sliding surface (4).

The present application relates to the technical field of flow distribution disc, and particularly relates to a high-pressure flow distribution disc three-section flow groove anti-cavitation structure, which comprises a flow distribution disc, the flow distribution disc comprises two centrally-symmetrically arranged large waist-shaped grooves, small waist-shaped grooves are symmetrically arranged on the two sides of the large waist-shaped grooves, the small waist-shaped grooves are arranged through the flow distribution disc, three-section flow grooves and a second single-section flow groove are respectively arranged at the two ends of the large waist-shaped grooves, and the two three-section flow grooves are centrally symmetrically arranged; the three-section flow groove comprises three triangular grooves which are completely identical in structure, the three triangular grooves are arranged at equal intervals, and one end of a same circular-arc groove is communicated with the end portions of the three triangular grooves, and the other end of the circular-arc groove is communicated with the large waist-shaped groove. The present application can increase the flow area, reduce the jet velocity, weaken the influence of wall shear force, thereby inhibit vortex production, further inhibit cavitation phenomenon of the flow distribution disc of the axial plunger pump under high-pressure working condition, reduce flow pressure pulsation and cavitation, and improve the efficiency and service life of the axial plunger pump.

A hydraulic control circuit of a double-acting orientation cylinder to orient fan vanes of a turbojet engine, including an oil tank, a variable-displacement axial piston pump including a swash plate controlled by a double-acting control and compensation cylinder including a control chamber and a compensation chamber, the pump being supplied by the reservoir and having the outlet thereof configured to be able to be connected, via a supply pipe, to a second chamber of the orientation cylinder, a first chamber of the orientation cylinder being connected to the tank, the chambers of the control and compensation cylinder both being pressurised with a pressure corresponding to the outlet pressure of the pump, and wherein the control and compensation chambers are arranged to increase the tilt of the plate in order to increase the displacement of the pump when the pressurisation pressure of these chambers increases.