Variable inclination angle type flow distribution pair oil film characteristic testing device and testing system

Abstract

The invention discloses a variable inclination angle type flow distribution pair oil film characteristic testing device and system, and belongs to the technical field of hydraulic equipment testing. The variable inclination angle type flow distribution pair oil film characteristic testing device comprises a shell, and two end covers on the shell and a pressurizing rotating shaft, a ball cup, a swing seat, a swash plate and an angle adjuster in the shell are correspondingly arranged; therefore, the testing device can accurately complete the installation of the flow distribution pair in the swash plate type plunger pump, and can adjust the swinging inclination angle of the flow distribution pair according to the testing requirement, thereby accurately simulating the tilting state of the plunger pump under different flow working conditions. The testing device and the testing system for the oil film characteristics of the flow distribution pair are simple in structure, convenient to control and capable of accurately completing installation of the flow distribution pair and accurately testing the oil film characteristics of the flow distribution pair under different oil pressures, different oil temperatures, different oil film thicknesses and different deflection angles, so that the oil film characteristic rule of the flow distribution pair is accurately judged; and an accurate test basis is provided for application and research of the swash plate type plunger pump.

Description

Technical Field

[0001] The present invention belongs to the technical field of hydraulic equipment testing, and particularly relates to a variable inclination angle type oil film characteristic testing device and testing system for a flow distribution pair. Background Art

[0002] The swash plate type piston pump is one of the common power components in the hydraulic field and has wide applications in many technical scenarios. As the key sealing component of the swash plate type piston pump, the flow distribution pair not only distributes the flow but also supports the cylinder block, directly affecting the volumetric efficiency and output performance of the pump. Therefore, in order to better evaluate and determine the service performance of the swash plate type piston pump, it is necessary to test the oil film characteristics of its flow distribution pair.

[0003] Currently, for the oil film characteristic testing of the flow distribution pair, there are already some devices for oil film testing in the prior art, such as the technical solutions disclosed in patent documents CN1235032C and CN117307474A. However, for the swash plate type piston pump, when its displacement changes, it will cause the flow distribution pair to swing together with the swash plate, resulting in a certain included angle between the axis of the flow distribution pair and the axis of the main shaft, which will cause changes in the oil film characteristics of the flow distribution pair. For the above situation existing in the swash plate type piston pump, most of the existing oil film testing devices cannot complete the simulation of the above motion states, resulting in certain limitations in the testing of the flow distribution pair of the swash plate type piston pump and being unable to accurately test the friction performance and leakage characteristics of the flow distribution pair. Summary of the Invention

[0004] In view of one or more of the above defects or improvement requirements of the prior art, the present invention provides a variable inclination angle type oil film characteristic testing device and testing system for a flow distribution pair, which can truly simulate the operating state of the flow distribution plate under various working conditions, accurately simulate the actual working conditions of the flow distribution pair in the swash plate type piston pump, and accurately complete the oil film characteristic testing of the flow distribution pair.

[0005] To achieve the above object, in one aspect of the present invention, a variable inclination angle type oil film characteristic testing device for a flow distribution pair is provided, including: A housing having an inner cavity; A first end cover and a second end cover hermetically assembled at both axial ends of the housing; A sealing support sleeve hermetically assembled on the inner wall surface of the inner cavity; the sealing support sleeve is spaced from both end covers, and a sealed test oil cavity is formed between the sealing support sleeve and the first end cover, and an interface communicating with the test oil cavity is provided on the housing; A swash plate having a test plane and a mounting arc surface at both axial ends; a mounting surface for mounting a distribution plate is provided on the test plane, and a plurality of through holes penetrating the mounting surface are provided on the mounting arc surface along the axial direction; the plurality of through holes include at least one oil inlet for accessing oil and a plurality of sensor mounting holes; sensors are respectively encapsulated in the plurality of sensor mounting holes, and the plurality of sensors include at least one micro-displacement sensor, at least one pressure sensor and at least one temperature sensor, which are respectively used to test the oil film thickness, oil pressure and oil temperature in the distribution pair; a through hole is provided in the middle of the first end cover, and a curved assembly surface is provided on one side of the first end cover close to the inner cavity, and the mounting arc surface is assembled with the curved assembly surface in a sliding sealing manner; A pressurizing shaft; one end of the pressurizing shaft is used for assembly with the driving motor, and the other end thereof passes through the second end cover and is assembled with the second end cover in a sealed manner, and an oil delivery blind hole is axially provided on the end surface of the other end, and an oil inlet hole and an oil outlet hole communicating with the oil delivery blind hole are provided on the outer periphery of the pressurizing shaft; A ball head seat; one end of the ball head seat is provided with a ball head, and the end away from the ball head is provided with an assembly blind hole in the axial direction and is assembled with the sealing support sleeve after passing through the sealing support sleeve; the end of the pressurizing shaft provided with the oil delivery blind hole is assembled with the assembly blind hole sliding clearance, and an annular limiter is provided between the pressurizing shaft and the ball head seat, so that the two can slide relative to each other in the axial direction without annular displacement; A swing seat; a toothed mounting portion for mounting a friction disc is disposed at one axial end of the swing seat, and a spherical groove is provided at the other end thereof, and the ball head is embedded in the spherical groove, so that the swing seat can swing relative to the ball head within a swinging plane; Angle adjusters are arranged in pairs on the shell; the axes of the two angle adjusters are arranged in a coplanar plane, and the plane is parallel to or coincides with the swing plane; each angle adjuster has a telescopic rod that can be telescopically adjusted, and the ends of the telescopic rod abut the test planes on both sides of the mounting surface.

[0006] As a further improvement of the present invention, an elastic member is provided between the pressurizing shaft and the ball head seat, and the elastic member is used to apply a force to the ball head seat and press the friction plate on the swing seat onto the distribution plate on the inclined plate.

[0007] By using the setting of the elastic part, the ball head seat is always subjected to a certain force to press the swing seat and the friction plate on the swing seat onto the distribution plate on the inclined plate, ensuring the accuracy and reliability of the assembly setting of the distribution pair to be tested on the test device.

[0008] As a further improvement of the present invention, the housing is provided with a stepped inner cavity at the end for connecting the first end cover, such that the inner diameter of the inner cavity accommodating the assembly end of the first end cover is larger than the inner diameter of the inner cavity accommodating the sealing support sleeve, forming an annular stepped surface, and there is a certain distance between the annular stepped surface and the end of the first end cover and the test plane of the swash plate respectively.

[0009] By means of the arrangement of the stepped inner cavity, the deflection adjustment of the swash plate can also be limited by the annular stepped surface, preventing one side of the swash plate from disengaging from the contact with the arc-shaped assembly surface, ensuring the sealing performance and reliability during the testing process of the testing device, and avoiding test errors caused by oil leakage of the equipment.

[0010] As a further improvement of the present invention, the mounting surface protrudes from the test plane; and / or, the test ends of the sensors are flush with the mounting surface.

[0011] By setting the position of the mounting surface, it can prevent the telescopic rod of the angle adjuster from contacting the outer peripheral wall surface of the valve plate too much, and also provide a certain positioning for the installation of the valve plate. By setting the ends of the sensors to be flush with the mounting surface, the consistency and accuracy of the test results of the sensors can be ensured, and measurement errors caused by equipment installation errors can be avoided.

[0012] As a further improvement of the present invention, a plurality of the oil inlets, the micro-displacement sensors, and the pressure sensors are all arranged at intervals; and / or An arc-shaped oil groove is formed on the mounting surface corresponding to the oil inlet, and each sensor can be directly opposite to the friction plate mounted on the swing seat through a through hole in the valve plate mounted on the mounting surface.

[0013] By setting a plurality of sensors, the oil film characteristic parameters in different regions of the mounting surface can be measured more accurately, the characteristic laws of the lubricating oil film in different regions under different working conditions can be judged, and thus the oil film characteristic laws of the valve plate pair under different working conditions can be determined more accurately.

[0014] Another aspect of the present invention also provides a test system for testing the oil film characteristics of the valve plate pair of a swash plate type piston pump; the test system includes the variable inclination type valve plate pair oil film characteristic testing device as described above, and also includes a first oil circuit, a second oil circuit, and an oil leakage pipeline arranged corresponding to the valve plate pair oil film characteristic testing device; The first oil circuit is communicated with the oil inlet on the swash plate and is used to supply high-pressure oil to the valve plate pair installed between the swing seat and the swash plate through the oil inlet; The second oil circuit is communicated with the oil inlet hole on the pressurizing rotating shaft and is used to introduce pressurized oil into the oil delivery blind hole to apply a force to the ball head seat and change the gap between the friction plate and the valve plate; The oil leakage pipeline is communicated with the test oil cavity and is used for detecting the oil flow rate overflowing from the test oil cavity during the operation test of the valve plate; and One end of the pressurizing rotating shaft departing from the ball head seat is assembled with a driving motor, and a rotational speed and torque test sensor is arranged on the pressurizing rotating shaft and is used for measuring the frictional torque of the valve pair during the rotation of the pressurizing rotating shaft.

[0015] As a further improvement of the present invention, the first oil circuit includes a first oil pump, a first one-way valve and a first accumulator which are sequentially arranged from the fuel tank; The second oil circuit includes a second oil pump, a second one-way valve, a second accumulator and a proportional servo valve which are sequentially arranged from the fuel tank.

[0016] Through the combined arrangement of the oil pumps, one-way valves and accumulators in each oil circuit, each oil circuit can accurately complete the formation and control of high-pressure oil, provide accurate conditions for the test of the valve pair and the pressurizing adjustment of the valve pair, and ensure the accuracy of the control process.

[0017] As a further improvement of the present invention, an overflow pipeline is further arranged between the first one-way valve and the first accumulator, and a unloading overflow valve and a proportional overflow valve which are communicated with the first oil circuit are arranged on the overflow pipeline; the unloading overflow valve is used for unloading the oil pressure in the oil circuit after the first oil circuit completes the test, and the proportional overflow valve is used for adjusting the oil pressure in the first oil circuit when the first oil circuit works.

[0018] By arranging the overflow pipeline, the convenience of the oil pressure control of the first oil circuit can be further improved, more variable condition controls can be provided for the oil film characteristic test of the valve pair, the diversity of the test scheme can be increased, and convenience is also provided for the high-pressure release of the oil circuit system after the test is completed, ensuring the use safety of the test system.

[0019] As a further improvement of the present invention, an overflow valve is arranged between the second one-way valve and the second accumulator, and the overflow valve is communicated with the overflow pipeline; and / or A heater and an oil temperature sensor are arranged in the fuel tank.

[0020] By connecting the second oil circuit to the overflow pipeline through the overflow valve, the safety and reliability of the control of the second oil circuit are also ensured. By arranging the heater and the oil temperature sensor in the fuel tank, the oil supply in the first oil circuit can change the oil temperature as required, and then the oil film characteristic law under different oil temperature conditions can be tested, further improving the comprehensiveness of the oil film characteristic test of the valve pair.

[0021] As a further improvement of the present invention, filters are arranged on the first oil circuit, the second oil circuit and / or the oil leakage pipeline; and / or At least one pressure sensor is provided on the first oil circuit and / or the second oil circuit; and / or At the end of the first oil circuit, a plurality of branches that can be individually opened and closed are provided. Each branch is respectively communicated with the oil inlet on the swash plate, and a pressure sensor is provided on each branch, and a proportional pressure reducing valve is provided on at least one branch.

[0022] By arranging filters on each oil circuit, the oil entering the corresponding device can ensure cleanliness, reduce equipment wear, and avoid test errors caused by the introduction of impurities. At the same time, by arranging several pressure sensors on the oil circuit, the oil pressure at different positions can be accurately judged, providing a basis and support for the control of experimental conditions. By arranging a plurality of individually openable and closable branches at the end of the first oil circuit, the oil pressure of the test system can be adjusted by replacing the connected branches, further improving the comprehensiveness and diversity of test condition control.

[0023] As long as the above-mentioned improved technical features do not conflict with each other, they can be combined with each other.

[0024] Generally speaking, compared with the prior art, the beneficial effects of the above technical solutions conceived by the present invention include: (1) The variable inclination angle type oil film characteristic test device for the flow distribution pair of the present invention includes a housing. By correspondingly arranging the two end covers on the housing and the pressurizing rotating shaft, ball head seat, swing seat, swash plate, and angle adjuster inside the housing, the test device can accurately complete the installation of the flow distribution pair in the swash plate type piston pump, and can adjust the swing inclination angle of the flow distribution pair according to the test needs, thereby accurately simulating the tilting state of the piston pump under different flow conditions, more accurately reproducing the specific state of the flow distribution pair during actual operation, and then accurately completing the oil film characteristic test of the flow distribution pair to ensure the accuracy of the test results.

[0025] (2) The test system of the present invention sets a first oil circuit, a second oil circuit, and an oil leakage pipeline for the variable inclination angle type oil film characteristic test device of the flow distribution pair, accurately realizes the high-pressure oil supply and pressurization control of the flow distribution pair in the test tooling, and accurately judges the leakage situation of the flow distribution pair under different working conditions by measuring the oil leakage flow rate, and then tests the oil film characteristics of the flow distribution pair under different oil pressures, different oil temperatures, different oil film thicknesses, and different deflection angles, so as to accurately judge the oil film characteristic law of the flow distribution pair and provide an accurate test basis for the application and research of the swash plate type piston pump. Description of the Drawings

[0026] To more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the accompanying drawings required for the embodiments. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. For those skilled in the art, without creative efforts, other accompanying drawings can be obtained based on these drawings.

[0027] Figure 1 is a structural sectional view of a variable inclination angle type oil film characteristic test device for a flow distribution pair in an embodiment of the present invention; Figure 2 is a sectional view of the oil film characteristic test device for the flow distribution pair in an embodiment of the present invention after variable inclination angle adjustment; Figure 3 is a schematic diagram of the end face of the swash plate of the oil film characteristic test device for the flow distribution pair in an embodiment of the present invention; Figure 4 is a side view of the swing seat structure of the oil film characteristic test device for the flow distribution pair in an embodiment of the present invention; Figure 5 is a front view of the swing seat structure of the oil film characteristic test device for the flow distribution pair in an embodiment of the present invention; Figure 6 is a schematic diagram of the friction disc structure in the flow distribution pair to be tested in an embodiment of the present invention; Figure 7 is a schematic diagram of the flow distribution disc structure in the flow distribution pair to be tested in an embodiment of the present invention; Figure 8 is a schematic diagram of the structure after the flow distribution disc is installed on the swash plate in an embodiment of the present invention; Figure 9 is a schematic diagram of the layout form of each sensor after the components of the test device in an embodiment of the present invention are assembled; Figure 10 is a principle architecture diagram of a variable inclination angle type oil film characteristic test system for a flow distribution pair in an embodiment of the present invention; In all the accompanying drawings, the same reference numerals represent the same technical features, specifically: 1. First oil circuit; 2. Second oil circuit; 3. Oil tank; 4. Overflow pipeline; 5. Oil leakage pipeline; 6. Test tooling; 7. Flow distribution pair to be tested; 101. First oil pump; 102. First motor; 103. First one-way valve; 104. First filter; 105. First accumulator; 106. First ball valve; 107. First oil pressure sensor; 108. Second ball valve; 109. Proportional pressure reducing valve; 110. Second oil pressure sensor; 201. Second oil pump; 202. Second motor; 203. Second one-way valve; 204. Second filter; 205. Third oil pressure sensor; 206. Relief valve; 207. Second accumulator; 208. Proportional servo valve; 209. Fourth oil pressure sensor; 301. Third filter; 302. Fourth filter; 303. Oil temperature sensor; 304. Heater; 401. Unloading overflow valve; 402. Proportional overflow valve; 403. Radiator; 501. Oil leakage filter; 502. Flowmeter; 601. Housing; 602. First end cover; 603. Swash plate; 6031. Oil inlet; 6032. Arc-shaped oil groove; 6033. Micro-displacement sensor; 6034. Pressure sensor; 6035. Temperature sensor; 6036. Connecting hole; 604. Swing seat; 6041. Tooth-shaped assembly part; 605. Ball head seat; 606. Pressurized rotating shaft; 607. Second end cover; 608. Sealing support sleeve; 609. Angle regulator; 610. Driving motor; 701. Friction plate; 702. Valve plate; 7021. Arc-shaped through groove; 7022. Mounting hole; 7023. First through hole; 7024. Second through hole. Detailed implementation manner

[0028] In order to make the objectives, technical solutions and advantages of the present invention clearer and more understandable, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0029] In the description of the present invention, it should be understood that unless otherwise clearly specified and limited, the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.

[0030] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of the present invention, "a plurality" means at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0031] In the present invention, unless otherwise clearly specified or limited, the terms "mounted", "connected", "coupled", "fixed", etc. shall be construed broadly. For example, it may be a fixed connection, a detachable connection, or an integral body; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the internal communication of two components or the interaction relationship between two components, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0032] In the present invention, unless otherwise clearly specified or limited, the first feature being "on" or "under" the second feature may be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature may be that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. The first feature being "under", "beneath" and "underneath" the second feature may be that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature.

[0033] The following refers to Figures 1 to 9 Describe a variable inclination angle type oil film characteristic test device for a flow distribution pair according to an embodiment of the present invention.

[0034] As Figure 1 As shown in

[0035] In actual setting, the inner cavity cross-section of the housing 601 is circular, and cylindrical protrusions are respectively provided at the ends of the two end covers for encapsulating one end of the housing 601, so that when the two end covers are connected to the two ends of the housing 601, they are respectively embedded and encapsulated with the cylindrical protrusions.

[0036] More preferably, a sealing groove is circumferentially formed on the outer periphery of the cylindrical protrusion, and a sealing member (such as an elastic sealing ring) is arranged therein to improve the sealing performance between the two end covers and the housing 601.

[0037] Furthermore, the test tooling 6 in the preferred embodiment further includes a swash plate 603. The swash plate 603 includes a test plane and a mounting arc surface. The edge of the mounting arc surface is connected to the edge of the test plane, which is equivalent to cutting a part of the sphere with a plane perpendicular to the diameter from a sphere, and the maximum thickness of the cut part is not greater than the radius of the sphere.

[0038] Meanwhile, a through hole is provided in the middle of the first end cap 602 in the preferred embodiment, and an arc-shaped assembly surface is provided circumferentially on the side of the first end cap 602 facing the inner cavity of the housing 601, so that the installation arc surface of the swash plate 603 can be slidably and sealingly assembled with the arc-shaped assembly surface on the first end cap 602.

[0039] Preferably, a sealing groove is provided circumferentially on the arc-shaped assembly surface, and an elastic seal is embedded in the sealing groove to improve the sealing performance between the swash plate 603 and the first end cap 602 during operation.

[0040] More specifically, an installation surface for installing the distribution plate 702 in the to-be-tested flow distribution pair 7 is provided on the test plane of the swash plate 603. This installation surface is preferably further protruded from the test plane, that is, a mounting table is protrudingly provided on the test plane. In actual setting, this installation surface is coaxially arranged with the test plane, and a plurality of connection holes 6036 are provided on the installation surface, for example Figure 3 two shown symmetrically about the axis in the figure.

[0041] Meanwhile, a plurality of through holes penetrating the installation surface are provided on the arc-shaped assembly surface of the swash plate 603 for installing a plurality of test sensors. In actual setting, the axes of the respective through holes are preferably perpendicular to the installation surface.

[0042] In specific setting, the test sensors include a micro displacement sensor 6033, a pressure sensor 6034, and a temperature sensor 6035. The detection ends of the respective sensors are all close to the side of the installation surface and do not protrude from the installation surface.

[0043] More preferably, the detection ends of the respective sensors are flush with the installation surface. After each sensor is installed, the gap between the sensor detection end and the through hole is filled with a filling material, thereby filling the ends of the respective through holes.

[0044] As Figure 3 shown in the figure, in the preferred embodiment, a plurality of micro displacement sensors 6033 are circumferentially spaced, for example, four circumferentially spaced as shown in the figure. Meanwhile, in the preferred embodiment, a plurality of pressure sensors 6034 are also circumferentially spaced, for example, three circumferentially spaced as shown in the figure. In addition, there is also a temperature sensor 6035.

[0045] In specific setting, the distribution plate 702 of the to-be-tested flow distribution pair 7 is in a circular ring form, and an arc-shaped through groove 7021 penetrating both end faces is provided on its disk body, so that after the distribution plate 702 is installed, the aforementioned temperature sensor 6035 is aligned with the arc-shaped through groove 7021 to ensure accurate detection of the oil temperature in the to-be-tested flow distribution pair 7.

[0046] In addition, a number of oil inlets 6031 penetrating the mounting surface are provided on the arc-shaped mounting surface for introducing high-pressure oil into the flow distribution pair 7 to be tested. In the preferred embodiment, the oil inlets 6031 are preferably two spaced apart ones for communicating with different oil pipelines to provide test oil with different oil pressures to the flow distribution pair 7 to be tested.

[0047] In the preferred embodiment as Figure 3 shown, arc-shaped oil grooves 6032 extending circumferentially are provided on the mounting surface corresponding to each oil inlet 6031; correspondingly, a plurality of arc-shaped through grooves 7021 are provided at intervals along the circumferential direction on the disk body of the flow distribution disk 702 corresponding to each arc-shaped oil groove 6032 to ensure that the test oil can accurately flow into the space between the friction disk 701 and the flow distribution disk 702.

[0048] Preferably, the temperature sensor 6035 in the preferred embodiment communicates with one arc-shaped oil groove 6032 and can be aligned with the friction disk 701 through the arc-shaped oil groove 6032 and the arc-shaped through groove 7021, so as to accurately detect the test oil temperature in the flow distribution pair 7 to be tested. Similarly, first through holes 7023 and second through holes 7024 are provided on the flow distribution disk 702 corresponding to the installation positions of the micro-displacement sensors 6033 and the pressure sensors 6034 respectively. Then, the micro-displacement sensor 6033 detects the oil film thickness in the corresponding area, and the pressure sensor 6034 detects the pressure of the test oil.

[0049] In addition, corresponding to the plurality of connection holes 6036 provided on the mounting surface, mounting holes 7022 are correspondingly provided on the flow distribution disk 702, so that the flow distribution disk 702 can be mounted on the swash plate 603 through a plurality of connectors respectively passing through the mounting holes 7022 and connecting to the connection holes 6036.

[0050] Furthermore, the friction disk 701 in the preferred embodiment is as Figure 6 shown, which is a disk-shaped structure corresponding to the flow distribution disk 702, and a through hole for assembly connection is provided in the middle. Correspondingly, a swing seat 604 for mounting the friction disk 701 is also provided in the housing 601, and its structural form is as Figure 4 、 Figure 5 shown. A toothed assembly portion 6041 protrudes from one end of the swing seat 604 in the axial direction. A plurality of tooth grooves are provided at intervals in the circumferential direction of the toothed assembly portion 6041 to form a Figure 5 gear-shaped structure as shown. And a tooth groove structure is provided along the circumferential direction in the middle through hole of the friction disk 701, so that the friction disk 701 can be embedded and fixed on the toothed assembly portion 6041 and move (such as rotate or swing) along with the swing seat 604.

[0051] In more detail, a ball head seat 605 and a pressurizing shaft 606 are coaxially arranged corresponding to the swing seat 604. A spherical ball head is arranged at one end of the ball head seat 605, and the end of the swing seat 604 away from the toothed assembly portion 6041 is slidably sleeved on the ball head and can perform in-plane swing adjustment relative to the ball head. At the same time, a mounting blind hole is opened along the axis at the other end of the ball head seat 605 for assembly and connection with one end of the pressurizing shaft 606.

[0052] As a specific arrangement of the swing seat 604 and the ball head seat 605, it is preferred that a spherical groove is provided at the end of the swing seat 604, and axially extending guide grooves are provided on both sides of the spherical groove; accordingly, guide pins are provided on both sides of the ball head in radially protruding directions, and the ends of the two guide pins are respectively embedded in the guide grooves, so as to ensure that the swing seat 604 can swing around the ball head in a plane passing through the axes of the two guide grooves, that is, Figure 2 The up and down swing shown in .

[0053] In a preferred embodiment, one end of the pressurizing shaft 606 passes through the second end cover 607 and is assembled with the mounting blind hole sliding gap at the end of the ball head seat 605, so that the pressurizing shaft 606 can drive the ball head seat 605 to rotate synchronously around the axis, and the ball head seat 605 can slide back and forth axially relative to the end of the pressurizing shaft 606.

[0054] As a specific arrangement, it is preferred that a certain length of slide groove is opened in the axial direction on the outer periphery of the end of the pressurizing shaft 606, and a stop pin with the end extending into the mounting blind hole is provided on the ball head seat 605, and the end of the stop pin extends into the slide groove, ensuring that the ball head seat 605 can be axially displaced relative to the pressurizing shaft 606, and no circumferential displacement occurs between the ball head seat 605 and the end of the pressurizing shaft 606. In this way, the pressurizing shaft 606 can drive the ball head seat 605 and the swing seat 604 to rotate around the axis.

[0055] Similarly, as another setting form, a slide groove can be opened axially on the inner wall surface of the mounting blind hole of the ball head seat 605, and a limit pin can be protrudingly provided on the outer periphery of the end of the pressurizing shaft 606. The limit pin is embedded in the slide groove to guide the axial displacement between the ball head seat 605 and the pressurizing shaft 606 and avoid circumferential rotation between the pressurizing shaft 606 and the ball head seat 605.

[0056] More specifically, the axial displacement of the ball head seat 605 relative to the pressurizing rotating shaft 606 is preferably achieved by oil pressure control. At this time, an oil delivery hole is axially provided at the end of the pressurizing rotating shaft 606 where it is connected to the ball head seat 605. This oil delivery hole is a blind hole, and an oil inlet hole that can be connected to an external oil delivery pipeline is provided in the middle of the pressurizing rotating shaft 606. This oil inlet hole communicates with the oil delivery hole, and can input oil fluid with a certain pressure between the end of the pressurizing rotating shaft 606 and the ball head seat 605, so as to achieve the axial displacement of the ball head seat 605 relative to the pressurizing rotating shaft 606. By applying a certain acting force to the ball head seat 605 through the pressurized oil fluid, the acting direction of this acting force is along the axis of the ball head seat 605, and is used to press the friction disc 701 in the to-be-tested flow distribution pair 7 onto the flow distribution disc 702, and finally adjust the gap width between the friction disc 701 and the flow distribution disc 702, that is, adjust the oil film thickness in the to-be-tested flow distribution pair 7.

[0057] In addition, during actual setting, it is preferred to provide an elastic member between the end of the pressurizing rotating shaft 606 and the ball head seat 605, such as Figure 1 , Figure 2 the spring shown in, this spring is correspondingly embedded in the axial blind hole at the end of the pressurizing rotating shaft 606, and the depth of this axial blind hole is less than the free length of the spring, ensuring that the spring has a certain resilience initially. By using the setting of the elastic member, it can ensure that the friction disc 701 can be pressed onto the flow distribution disc 702 when not being tested, to provide the acting force for initial pressing, and then use the pressurized oil fluid to provide the acting force for adjusting the oil film thickness.

[0058] At the same time, it is preferred to provide a motor corresponding to the end of the pressurizing rotating shaft 606 extending out of the second end cover 607, that is Figure 10 the driving motor 610 in, the driving motor 610 drives the pressurizing rotating shaft 606 to rotate, thereby realizing the rotation control of the friction disc 701 relative to the flow distribution disc 702.

[0059] In addition, a torque sensor is installed on the pressurizing rotating shaft 606 to detect the frictional torque during the rotation of the device, so as to calculate the frictional loss of the flow distribution pair under different working conditions.

[0060] During actual setting, to ensure the assembly accuracy of the pressurizing rotating shaft 606 and the second end cover 607, a sealing assembly and a rotating assembly are provided between the pressurizing rotating shaft 606 and the second end cover 607, such as mechanical sealing components and rotating bearings.

[0061] Meanwhile, to ensure the reliability of the rotation control of the pressurizing rotating shaft 606, it is preferably provided with a sealing support sleeve 608 in the housing 601. The outer periphery of the sealing support sleeve 608 is hermetically assembled with the inner cavity wall surface of the housing 601, and one end of the ball head seat 605 away from the ball head part passes through the sealing support sleeve 608 and is assembled with the end part of the pressurizing rotating shaft 606. Correspondingly, a rotating sealing assembly is provided between the outer periphery of the ball head seat 605 and the sealing support sleeve 608, which separates the spaces on both axial sides of the sealing support sleeve 608 and realizes the relative rotation of the ball head seat 605 relative to the sealing support sleeve 608.

[0062] More specifically, in order to realize the sealing assembly setting of the sealing support sleeve 608, it is preferably provided with an annular step surface in the middle of the inner cavity of the housing 601, so that one side of the sealing support sleeve 608 abuts against the annular step surface to complete the sealing assembly.

[0063] Based on the sealing assembly of the pressurizing rotating shaft 606 and the second end cover 607 and the sealing assembly between the ball head seat 605 and the sealing support sleeve 608, the collimation of the rotation control of the rotating mechanism can be fully ensured, thereby reducing the error in the test result of the oil film characteristics after the angle adjustment of the subsequent flow distribution pair 7 to be measured and improving the accuracy of the test result.

[0064] Furthermore, angle adjusters 609 are also provided in pairs corresponding to the angle adjustment of the flow distribution pair. Each angle adjuster 609 includes a sleeve arranged at a certain inclination angle with the surface of the housing 601 and a telescopic rod coaxially assembled in the sleeve. The axes of the two telescopic rods are arranged in the same plane and can reciprocate telescopically along the axes. At the same time, the two angle adjusters 609 are obliquely arranged on the wall surfaces on both sides of the housing 601, and one end of the telescopic rod extends into the housing 601 and abuts against the test planes on both sides of the mounting surface, as Figure 1 shown. At this time, by controlling the telescopic rod of one angle adjuster 609 to extend and the telescopic rod of the other angle adjuster 609 to retract, the swash plate 603 can be controlled to deflect.

[0065] It can be understood that in actual setting, the plane in which the axes of the two telescopic rods are located is parallel or coplanar with the plane in which the axes of the two guide pins on both sides of the ball head seat 605 are located. In the preferred embodiment as Figure 1 shown, the axes of the two telescopic rods and the axes of the two guide pins on the ball head seat 605 are arranged in the same plane; such a setting can ensure the accuracy of the angle adjustment of the swash plate 603 by the two angle adjusters 609.

[0066] In addition, since the swing seat 604 presses the friction disc 701 against the flow distribution disc 702 on the swash plate 603, the deflection of the swash plate 603 will correspondingly be converted into the deflection of the swing seat 604 relative to the ball head seat 605, Figure 1 and the structural form in Figure 2 is switched to the structural form shown in

[0067] Preferably, in order to reduce the friction between the telescopic rod and the test plane when they are in contact, the end of the telescopic rod is preferably set in the form of a ball head.

[0068] More preferably, in order to control the angular deflection stroke of the swash plate 603, it is also preferably provided with a stepped inner cavity at the end of the housing 601 where the first end cover 602 is assembled and connected, that is, the inner diameter of the inner cavity accommodating the assembly end of the first end cover 602 is larger than the inner diameter of the inner cavity accommodating the sealing support sleeve 608, forming an annular stepped surface with a certain width. The annular stepped surface is spaced apart from the end of the first end cover 602 and the test plane of the swash plate 603 by a certain distance, ensuring that the swash plate 603 has a certain deflection space.

[0069] It can be understood that the larger the distance between the annular stepped surface and the test plane (when perpendicular to the axis of the housing 601), the larger the adjustable deflection angle of the swash plate 603. However, to ensure the reliability of the device, the deflectable angle of the swash plate 603 should not be too large, especially not greater than the critical angle when the installation arc surface of the swash plate 603 crosses the junction of the arc-shaped assembly surface on the first end cover 602 and the inner wall surface of the middle through hole, that is, to ensure that the swash plate 603 is always abutted and limited by the arc-shaped assembly surface.

[0070] In actual setting, the opening boundary of the middle through hole on the first end cover 602 is preferably determined by the following method: When the adjustment angle of the swash plate 603 is the largest, positioning lines parallel to the axis of the swash plate 603 are set on both sides of the installation surface on the test plane. The intersection of the positioning lines and the end face of the first end cover 602 facing away from the to-be-tested flow distribution pair 7 is the opening boundary point of the middle through hole. The connection line between the boundary point and the center of the first end cover 602 is the opening radius of the middle through hole, and then the opening of the middle through hole on the first end cover 602 is completed.

[0071] In actual setting, the high-pressure oil for testing is introduced into the to-be-tested flow distribution pair 7 through the oil inlet 6031. Moreover, due to the respective sealed assemblies between the sealing support sleeve 608, the first end cover 602 and the housing 601, a closed cavity is formed between the sealing support sleeve 608 and the first end cover 602, which is denoted as the test oil cavity. During actual testing, the test oil cavity is filled with oil, and a pipeline communicating with the test oil cavity is provided on the housing 601, that is, the oil leakage pipeline 5. The oil leaked from the test oil cavity is detected through the oil leakage pipeline 5, so as to test the leakage flow rate of the to-be-tested flow distribution pair 7 during test operation under different working conditions.

[0072] By using the setting of the aforementioned flow distribution pair oil film characteristic testing device, it is possible to accurately simulate the operating states of the flow distribution pair of the swash plate type piston pump under different working conditions (temperature, rotational speed, oil pressure), different oil film thicknesses, and variable displacement operations, and accurately test the oil film characteristics of the flow distribution pair.

[0073] As another aspect of the present invention, a test system based on the aforementioned test device for the oil film characteristics of the flow distribution pair is further provided. The structural schematic diagram is as shown in Figure 10 and includes a first oil circuit 1, a second oil circuit 2, and an oil leakage pipeline 5 corresponding to the test tooling 6.

[0074] Among them, corresponding to the settings of the two oil circuits, the sources of the oil fluid can be set separately or share the same source. For example, in the preferred embodiment shown in Figure 10 , the first oil circuit 1 and the second oil circuit 2 share the same oil tank 3.

[0075] Specifically, one end of the first oil circuit 1 in the preferred embodiment is connected to the oil tank 3, and the other end is connected to the oil inlet 6031 on the swash plate 603, for introducing high-pressure oil fluid into the flow distribution pair 7 to be tested through the first oil circuit 1. It can be understood that when there are multiple oil inlets 6031 on the swash plate 603, when one of the oil inlets 6031 is connected to the first oil circuit 1, the remaining oil inlets 6031 are all closed to ensure the sealing performance of the test system.

[0076] More specifically, the first oil circuit 1 in the preferred embodiment includes a first oil pump 101, a first one-way valve 103, and a first accumulator 105 arranged in sequence. The first oil pump 101 pumps the oil fluid in the oil tank 3 into the first oil circuit 1. The oil fluid enters the first accumulator 105 after passing through the first one-way valve 103, and a high-pressure oil source is formed here, and then provides oil fluid that meets specific requirements for the test tooling 6.

[0077] In actual setting, the first oil pump 101 is preferably a piston pump, and a first motor 102 is correspondingly arranged for it. The supply oil flow is changed by controlling the rotation speed of the first motor 102 to meet the demand of the supply oil pressure. Moreover, in order to facilitate the adjustment of the supply oil pressure, it is preferably provided with multiple branches at the end of the first oil circuit 1. Each branch can be respectively controlled for on-off, and at least one branch has the ability to change the oil fluid pressure, so as to provide oil fluid with different oil pressures for the swash plate 603.

[0078] When specifically setting, the number of branches at the end of the first oil circuit 1 can be the same as the number of oil inlets 6031 on the swash plate 603, or multiple branches can share the same oil inlet 6031. For the case where the number of branches is the same as the number of oil inlets 6031, each branch is respectively connected to different oil inlets 6031 on the swash plate 603. When a certain oil inlet 6031 is working, the remaining oil inlets 6031 are blocked because the branches connected to them are disconnected; for the case where multiple branches share one oil inlet 6031, valves need to be respectively arranged at the head and tail ends of the branch to switch the non-working branches to the non-working state.

[0079] Exemplarily, taking Figure 8 、 Figure 9Taking the preferred embodiment in [reference] as an example, the oil inlet 6031 is set to two at this time; correspondingly, there are two branches at the end of the first oil circuit 1, as shown in Figure 10 shown. Openable and closable valves are respectively arranged on the two branches, namely the first ball valve 106 and the second ball valve 108, and the switching of different branches is realized by the opening and closing of the two ball valves. At the same time, oil pressure sensors are arranged at the ends of the two branches communicating with the oil inlet 6031, namely the first oil pressure sensor 107 and the second oil pressure sensor 110, to respectively detect the oil pressure in the working branch. In addition, it is preferably provided with a proportional pressure reducing valve 109 between the second ball valve 108 and the second oil pressure sensor 110, and the oil pressure fed into the test fixture 6 is changed by the control of the proportional pressure reducing valve 109; correspondingly, the oil pressure flowing into the test fixture 6 from the first ball valve 106 is the same as the oil pressure at the outlet of the first accumulator 105. By the switching control of the two branches, the oil pressure fed into the test fixture 6 can be finally changed.

[0080] More preferably, a first filter 104 is further arranged on the first oil circuit 1, and it is preferably arranged between the first one-way valve 103 and the first accumulator 105, and is used for filtering the oil to ensure the cleanliness of the oil delivered to the test fixture 6.

[0081] In addition, in order to better control the oil pressure in the first oil circuit 1, an overflow pipeline 4 is preferably arranged between the first one-way valve 103 and the first accumulator 105. An unloading overflow valve 401 and a proportional overflow valve 402 communicating with the first oil circuit 1 are arranged on the overflow pipeline 4. The former is used for unloading the oil pressure in the oil circuit after the first oil circuit 1 completes the test, and the latter is used for adjusting the oil pressure in the first oil circuit 1 during the working process of the first oil circuit 1, and changing the oil supply pressure of the system from the front end of the first accumulator 105. Correspondingly, the end of the overflow pipeline 4 is communicated with the oil recovery system, for example, connected to a fuel tank. In order to ensure the quality of oil recovery, it is preferably provided with devices for cooling and filtering at the end of the overflow pipeline 4, such as a radiator 403 or an oil filter, which will not be elaborated here.

[0082] Furthermore, the second oil circuit 2 in the preferred embodiment is communicated with the pressing mechanism in the test fixture 6, and is used for providing the pressure for pressing the distribution disk 702 by the friction disk 701 and changing the magnitude of the loading force as required.

[0083] Specifically, the second oil circuit 2 in the preferred embodiment includes a second oil pump 201, a second one-way valve 203, a second accumulator 207, and a proportional servo valve 208 arranged in sequence. The end of the second oil circuit 2 is communicated with the oil inlet hole on the pressurizing rotating shaft 606, and pressure oil is input into the oil delivery hole in the middle of the pressurizing rotating shaft 606. Through the oil pressure control in the second oil circuit 2, a corresponding loading force is provided for the ball head seat 605 to adjust the thickness of the lubricating oil film of the flow distribution pair. Correspondingly, an oil outlet hole communicating with the oil delivery hole is also provided on the outer periphery of the pressurizing rotating shaft 606, and this oil outlet hole is communicated with the proportional servo valve 208 through a pipeline for outputting the oil to the oil recovery system after the second oil circuit 2 finishes working, as Figure 10 shown in

[0084] More specifically, a second filter 204, a third oil pressure sensor 205, and a relief valve 206 communicated with the overflow pipeline 4 are further arranged between the second one-way valve 203 and the second accumulator 207. The oil pressure at the front end of the second accumulator 207 can be detected by the third oil pressure sensor 205, and the oil pressure in the oil circuit at the front end of the second accumulator 207 can be adjusted by the relief valve 206. In addition, a fourth oil pressure sensor 209 is also arranged on the oil circuit at the rear end of the proportional servo valve 208 to accurately monitor the magnitude of the oil pressure entering the pressurizing rotating shaft 606.

[0085] In actual setting, the second oil pump 201 is preferably a gear pump, and a second motor 202 is correspondingly arranged for it. The second motor 202 controls the oil flow rate in the second oil circuit 2.

[0086] Furthermore, one end of the oil leakage pipeline 5 in the preferred embodiment is communicated with the test oil cavity between the sealing support sleeve 608 and the first end cover 602, and the other end is communicated with the oil recovery system. At the same time, a flow meter 502 is arranged on the oil leakage pipeline 5 to recover the oil overflowing from the test oil cavity and count the flow rate of the overflowing oil.

[0087] More preferably, an oil leakage filter 501 is preferably arranged at the front end of the flow meter 502 to filter the overflowing oil and ensure the cleanliness of the finally recovered oil.

[0088] In addition, considering the need to provide oil at different temperatures during the test, a heater 304 and an oil temperature sensor 303 are preferably arranged in the fuel tank 3 in the preferred embodiment. The former is used to heat the oil in the fuel tank 3, and the latter is used to detect the temperature of the oil. In addition, filters, namely a third filter 301 and a fourth filter 302, are preferably arranged at the first ends of the first oil circuit 1 and the second oil circuit 2 in the fuel tank 3 to ensure the cleanliness of the oil entering the two oil circuits.

[0089] In addition, for the test fixture 6 in the test system, a drive motor 610 is connected to the end of the pressurizing rotating shaft 606, and a torque and speed sensor is provided corresponding to the pressurizing rotating shaft 606 to measure the frictional torque of the flow distribution pair 7 to be tested during the rotation of the pressurizing rotating shaft 606.

[0090] Based on the settings of the aforementioned test system, the oil film characteristics of the flow distribution pair 7 to be tested can be measured, and the effects of oil pressure, loading force, rotational speed, temperature, and swash plate inclination angle on the oil film lubrication characteristics can be studied. The oil film characteristics preferably include at least oil film thickness, leakage flow rate, and frictional torque.

[0091] (1) Control the inlet oil pressure of the flow distribution pair test fixture 6 through the first oil circuit 1 (read through the pressure sensor 6034); adjust the proportional servo valve 208 to control the magnitude of the loading force of the pressurizing rotating shaft 606, thereby adjusting the thickness of the lubricating oil film of the flow distribution pair (the oil film thickness can be read through the micro-displacement sensor 6033); at this time, the leakage flow rate of the flow distribution pair can be obtained through the flowmeter 502, and the frictional torque can be obtained through the torque and speed sensor. In this way, the changes in the oil film thickness, leakage flow rate, and frictional torque of the flow distribution pair 7 to be tested under different pressures can be obtained.

[0092] (2) Control the rotational speed of the pressurizing rotating shaft 606 through the drive motor 610, adjust the proportional servo valve 208 to control the magnitude of the loading force of the ball head seat 605, and then adjust the thickness of the lubricating oil film of the flow distribution pair (the oil film thickness can be read through the micro-displacement sensor 6033), obtain the leakage flow rate of the flow distribution pair through the flowmeter 502, and obtain the frictional torque through the torque and speed sensor. In this way, the changes in the oil film thickness, leakage flow rate, and frictional torque of the flow distribution pair 7 to be tested at different rotational speeds can be obtained.

[0093] (3) Control the oil temperature in the first oil circuit 1 through the heater 304, read the oil film thickness through the micro-displacement sensor 6033, obtain the leakage flow rate of the flow distribution pair through the flowmeter 502, and obtain the frictional torque through the torque and speed sensor. In this way, the changes in the oil film thickness, leakage flow rate, and frictional torque of the flow distribution pair 7 to be tested at different oil temperatures can be obtained.

[0094] (4) Through the control of the two angle adjusters 609 in the test fixture 6, change the inclination angle of the swash plate 603 to simulate the actual pose of the flow distribution pair during the variable displacement control of the swash plate piston pump. Read the oil film thickness through the micro-displacement sensor 6033, obtain the leakage flow rate of the flow distribution pair through the flowmeter 502, and obtain the frictional torque through the torque and speed sensor. In this way, the changes in the oil film thickness, leakage flow rate, and frictional torque of the flow distribution pair 7 to be tested at different inclination angles of the swash plate 603, as well as the stability law of the oil film of the flow distribution pair during the change of the swash plate inclination angle, can be obtained.

[0095] In summary, based on the setup of the test system for the oil film characteristics testing device with a variable inclination angle type port plate pair, the oil film characteristics testing of the port plate pair of the swash plate type piston pump can be accurately completed under different working conditions, accurately characterizing the characteristics and stability laws of the oil film of the port plate pair, and further providing a basis and data support for the application and research of the swash plate type piston pump.

[0096] It is easy for those skilled in the art to understand that the above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims

1. A variable inclination type distribution pair oil film characteristic testing device, characterized in that: include: a housing having an inner cavity; A first end cover and a second end cover are sealably assembled at both axial ends of the housing; A sealing support sleeve is sealably assembled on the inner wall surface of the inner cavity; the sealing support sleeve is spaced apart from the two end covers, and a closed test oil cavity is formed between the sealing support sleeve and the first end cover, and an interface communicating with the test oil cavity is provided on the housing; A swash plate having a test plane and a mounting arc surface at both axial ends; a mounting surface for mounting a distribution plate is provided on the test plane, and a plurality of through holes penetrating the mounting surface are provided on the mounting arc surface along the axial direction; the plurality of through holes include at least one oil inlet for accessing oil and a plurality of sensor mounting holes; sensors are respectively encapsulated in the plurality of sensor mounting holes, and the plurality of sensors include at least one micro-displacement sensor, at least one pressure sensor and at least one temperature sensor, which are respectively used to test the oil film thickness, oil pressure and oil temperature in the distribution pair; a through hole is provided in the middle of the first end cover, and a curved assembly surface is provided on one side of the first end cover close to the inner cavity, and the mounting arc surface is assembled with the curved assembly surface in a sliding sealing manner; A pressurizing shaft; one end of the pressurizing shaft is used for assembly with the driving motor, and the other end thereof passes through the second end cover and is assembled with the second end cover in a sealed manner, and an oil delivery blind hole is axially provided on the end surface of the other end, and an oil inlet hole and an oil outlet hole communicating with the oil delivery blind hole are provided on the outer periphery of the pressurizing shaft; A ball head seat; one end of the ball head seat is provided with a ball head, and the end away from the ball head is provided with an assembly blind hole in the axial direction and is assembled with the sealing support sleeve after passing through the sealing support sleeve; the end of the pressurizing shaft provided with the oil delivery blind hole is assembled with the assembly blind hole sliding clearance, and an annular limiter is provided between the pressurizing shaft and the ball head seat, so that the two can slide relative to each other in the axial direction without annular displacement; A swing seat; a toothed mounting portion for mounting a friction disc is disposed at one axial end of the swing seat, and a spherical groove is provided at the other end thereof, and the ball head is embedded in the spherical groove, so that the swing seat can swing relative to the ball head within a swinging plane; Angle adjusters are arranged in pairs on the shell; the axes of the two angle adjusters are arranged in a coplanar plane, and the plane is parallel to or coincides with the swing plane; each angle adjuster has a telescopic rod that can be telescopically adjusted, and the ends of the telescopic rod abut the test planes on both sides of the mounting surface.

2. The variable inclination angle distribution pair oil film characteristic testing device according to claim 1 is characterized in that: An elastic member is arranged between the pressurizing shaft and the ball head seat, and the elastic member is used to apply a force to the ball head seat and press the friction plate on the swing seat onto the distribution plate on the inclined plate.

3. The variable inclination type flow distribution pair oil film characteristic testing device according to claim 1 is characterized in that: The end of the shell used to connect to the first end cover is provided with a stepped inner cavity, so that the inner diameter of the inner cavity accommodating the assembly end of the first end cover is larger than the inner diameter of the inner cavity accommodating the sealing support sleeve, forming an annular step surface, and the annular step surface is spaced a certain distance from the end of the first end cover and the test plane of the swash plate.

4. The variable inclination type flow distribution pair oil film characteristic testing device according to any one of claims 1 to 3, characterized in that: The mounting surface protrudes from the test plane; and / or The test end of each sensor is flush with the mounting surface.

5. The variable inclination type flow distribution pair oil film characteristic testing device according to any one of claims 1 to 3, characterized in that: The oil inlet, the micro-displacement sensor, and the pressure sensor are all arranged in multiple intervals; and / or An arc-shaped oil groove is provided on the installation surface corresponding to the oil inlet, and each sensor can be directly facing the friction plate installed on the swing seat through the through hole on the distribution plate installed on the installation surface.

6. A test system for testing the oil film characteristics of the flow distribution pair of a slant plate plunger pump; characterized in that: The test system comprises a variable-angle distribution pair oil film characteristic test device according to any one of claims 1 to 5, and further comprises a first oil circuit, a second oil circuit and an oil leakage pipeline arranged corresponding to the distribution pair oil film characteristic test device; The first oil circuit is connected to the oil inlet on the swash plate, and is used to supply high-pressure oil to the distribution pair installed between the swing seat and the swash plate through the oil inlet; The second oil circuit is connected to the oil inlet hole on the pressurized rotating shaft, and is used to pass pressurized oil into the oil delivery blind hole to apply force to the ball head seat and change the gap between the friction plate and the distribution plate; The oil leakage pipeline is connected to the test oil chamber and is used to detect the oil flow rate overflowing from the test oil chamber during the operation test of the valve plate; and One end of the pressurizing shaft away from the ball head seat is assembled with the driving motor, and a speed torque test sensor is arranged on the pressurizing shaft for measuring the friction torque of the distribution pair during the rotation of the pressurizing shaft.

7. The test system according to claim 6, characterized in that: The first oil circuit includes a first oil pump, a first check valve and a first accumulator which are arranged in sequence from the oil tank; The second oil circuit includes a second oil pump, a second one-way valve, a second accumulator and a proportional servo valve which are arranged in sequence from the oil tank.

8. The test system according to claim 7, characterized in that: It also includes an overflow pipeline arranged between the first one-way valve and the first accumulator, on which a unloading overflow valve and a proportional overflow valve connected to the first oil circuit are arranged; the unloading overflow valve is used to unload the oil pressure in the oil circuit after the first oil circuit completes the test, and the proportional overflow valve is used to adjust the oil pressure in the first oil circuit when the first oil circuit is working.

9. The test system according to claim 8, characterized in that: An overflow valve is provided between the second one-way valve and the second accumulator, and the overflow valve is connected to the overflow pipeline; and / or A heater and an oil temperature sensor are arranged in the oil tank.

10. The test system according to any one of claims 6 to 9, characterized in that: A filter is provided on the first oil circuit, the second oil circuit and / or the oil leakage pipeline; and / or At least one pressure sensor is provided on the first oil circuit and / or the second oil circuit; and / or A plurality of branches which can be opened and closed independently are arranged at the end of the first oil circuit, each branch is respectively connected to the oil inlet on the swash plate, each branch is respectively provided with a pressure sensor, and a proportional pressure reducing valve is arranged on at least one branch.

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