Axial plunger hydraulic sealing working cavity device

Abstract

The invention discloses an axial plunger hydraulic sealing working cavity device, and relates to the technical field of plunger hydraulic pumps, in the axial plunger hydraulic sealing working cavity device, spherical hinge plungers with the same number are hinged to the two end faces of a main shaft rotating disc assembly respectively, each spherical hinge plunger comprises a conical cylinder, a spherical hinge and a spherical table, and the spherical hinges and the spherical tables are arranged at the two ends of the conical cylinder; a sleeve seat is arranged on each of two sides of the main shaft turntable assembly, an inclined angle beta is formed between each sleeve seat and the main shaft turntable assembly, sleeves with the same number are fixedly mounted on the two sleeve seats, and spherical hinge plungers on the main shaft turntable assembly are sleeved with the sleeves on the sleeve seats on the corresponding sides in a one-to-one correspondence manner to form a sealed working cavity; the sleeve comprises a sleeving part sleeving the table and a connecting part for fixing the sleeve on the sleeve seat; the main shaft penetrates through the main shaft rotating disc assembly and the two sleeve bases and is connected with the sleeve bases. According to the axial plunger hydraulic sealing working cavity device, the technical problems that large hydraulic impact is generated during rotation reversing, and the plunger is clamped are solved.

Description

Technical Field

[0001] The present application relates to the technical field of plunger hydraulic pumps, and in particular to an axial plunger hydraulic sealing working chamber device. Background Art

[0002] At present, high-pressure and high-speed hydraulic pumps or motors are mainly axial piston structures. The sealed working chamber (variable sealed volume) of the axial piston hydraulic pump or motor is composed of an axially arranged cylinder body and a plunger that moves axially in the cylinder body plunger chamber, which belongs to the axial piston sealed working chamber. According to the different mechanisms for transmitting the linear motion of the plunger and the rotational motion of the main shaft, the existing axial piston hydraulic pumps or hydraulic motors can be divided into two categories: inclined plate type and inclined axis type.

[0003] However, the existing axial piston hydraulic pump or hydraulic motor has the following disadvantages when realizing the conversion between hydraulic energy and mechanical energy:

[0004] First, during operation, the plunger axis and the cylinder plunger cavity axis are parallel or coincident, and the seal between the plunger and the cylinder plunger cavity mainly relies on the gap seal. In order to ensure the reliability of the seal, it is necessary to ensure that the plunger has sufficient cylinder length in the cylinder plunger cavity. This makes the length of the plunger and the cylinder body larger, and the moment of inertia is larger. When the rotation is reversed, the response is not timely and it is easy to produce a large hydraulic shock.

[0005] Secondly, while the plunger is extending and pressing axially in the plunger cavity of the cylinder, it must drive (motor working condition) or follow (pump working condition) the cylinder to revolve around the main axis. In order to realize the mutual transmission of the two kinds of motions, the axial linear movement of the plunger and the revolution of the cylinder, the plunger of the existing axial plunger hydraulic pump or hydraulic motor will radially squeeze the plunger cavity of the cylinder while moving axially. This is the reason why the plunger of the existing axial plunger pump or motor will get stuck in the cylinder and cause malfunctions. Summary of the invention

[0006] The purpose of the present application is to provide an axial piston hydraulic sealing working chamber device, which can reduce hydraulic shock and sticking.

[0007] To achieve the above-mentioned purpose, the present application provides an axial piston hydraulic sealing working chamber device, including a spindle turntable assembly, a ball joint plunger, a sleeve, a sleeve seat and a spindle;

[0008] The two end faces of the spindle turntable assembly are each hinged with an equal number of ball joint plungers;

[0009] The ball joint plunger comprises a ball joint, a tapered cylinder and a ball table, wherein the ball joint and the ball table are respectively arranged at two ends of the tapered cylinder;

[0010] On both sides of the main shaft turntable assembly, there is a sleeve seat respectively. The central axis of the sleeve seat has an inclination angle β with respect to the central axis of the main shaft turntable assembly. On the end faces of the two sleeve seats facing the main shaft turntable assembly, there are the same number of sleeves fixedly installed. The ball hinge plungers on the main shaft turntable assembly are sleeved with the sleeves on the corresponding side sleeve seat one by one to form a sealed working chamber between the ball hinge plungers and the sleeves;

[0011] The sleeve includes a socket part and a connecting part. Both the socket part and the connecting part are hollow cylindrical tubes and are of an integral structure. The socket part is sleeved outside the corresponding ball table, and the connecting part is used to fix the sleeve on the sleeve seat;

[0012] The main shaft passes through the middle of the main shaft turntable assembly and the two sleeve seats. The main shaft is connected to the sleeve seats so as to rotate synchronously and allow axial offset between the main shaft and the sleeve seats.

[0013] In some embodiments, the main shaft turntable assembly includes a main shaft turntable, a ball hinge seat and a ball hinge pressing plate;

[0014] The main shaft turntable is of a disc-shaped structure. On the two end faces of the main shaft turntable, there are several ball hinge seats respectively. The ball hinges are nested in the ball hinge seats. The ball hinge pressing plates are installed on the two end faces of the main shaft turntable. The through holes opened on the ball hinge pressing plates can allow the ball tables to pass through, but restrict the movement of the ball hinges in the corresponding ball hinge seats.

[0015] In some embodiments, the number of ball hinge seats on the two end faces of the main shaft turntable is the same and they are uniformly distributed along the circumferential direction. The circles formed by the ball hinge seats on the two end faces of the main shaft turntable are concentric and have the same diameter. The ball hinge seats on the two end faces of the main shaft turntable are distributed with a certain phase angle offset.

[0016] In some embodiments, the phase angle offset between the adjacent ball hinge seats located on the two end faces of the main shaft turntable respectively is half of the central angle corresponding to the adjacent two ball hinge seats on the same end face of the main shaft turntable.

[0017] In some embodiments, the diameter of the ball table is equal to the inner diameter of the socket part, and the thickness of the ball table is less than 0.8 times the diameter of the ball table to ensure that when the main shaft turntable assembly rotates, the ball table can not only move axially in the socket part, but also maintain line contact sealing with the inner cylindrical surface of the socket part.

[0018] In some embodiments, the end face of the sleeve seat facing away from the main shaft turntable assembly is assembled with an oil distribution plate, and the oil distribution plate is used to supply oil or drain oil to the sealed working chamber.

[0019] In some embodiments, a key connection is adopted between the main shaft and the sleeve seat.

[0020] In some embodiments, the number of sealed working chambers on either side of the main shaft turntable assembly is 9 - 12.

[0021] Compared with the above background art, the axial piston hydraulic seal working chamber device provided by the embodiments of the present application includes a main shaft turntable assembly, spherical hinge pistons, sleeves, sleeve seats and a main shaft. Among them, the same number of spherical hinge pistons are hinged to each of the two end faces of the main shaft turntable assembly; each spherical hinge piston includes a spherical hinge, a conical cylinder and a spherical table, and the spherical hinge and the spherical table are respectively arranged at both ends of the conical cylinder; a sleeve seat is provided on each side of the main shaft turntable assembly, and the central axis of the sleeve seat has an inclination angle β with respect to the central axis of the main shaft turntable assembly. The same number of sleeves are fixedly installed on the end faces of the two sleeve seats facing the main shaft turntable assembly. The spherical hinge pistons on the main shaft turntable assembly are sleeved with the sleeves on the corresponding sleeve seats one by one to form a sealed working chamber between the spherical hinge pistons and the sleeves; each sleeve includes a socket part and a connecting part, both the socket part and the connecting part are hollow cylindrical tubes and are of an integral structure. The socket part is sleeved outside the corresponding spherical table, and the connecting part is used for fixing the sleeve on the sleeve seat; the main shaft passes through the middle of the main shaft turntable assembly and the two sleeve seats, and the main shaft is connected to the sleeve seat so as to rotate synchronously and allow axial offset between the main shaft and the sleeve seat.

[0022] The axial piston hydraulic seal working chamber device arranged in this way has the following beneficial effects mainly:

[0023] First, when the axial piston hydraulic seal working chamber device (axial piston pump or motor) works, it can ensure that when the spherical hinge piston swings around the axis, one end of the spherical hinge piston always tangentially contacts the inner wall of the sleeve with a spherical surface. In this way, when the sleeve is sleeved outside the spherical hinge piston and makes a reciprocating motion and the sleeve also revolves around the main shaft, the spherical table of the spherical hinge piston and the inner wall of the sleeve always maintain effective line contact sealing and there is no dimensional interference. Using line sealing has higher efficiency than traditional clearance sealing, better sealing reliability, and does not require the lengths of the piston and the sleeve to be relatively large, which can reduce the moment of inertia and thus reduce the harm of pressure shock during rotational commutation.

[0024] Second, regardless of whether it is in the pump working condition or the motor working condition, in the entire motion transmission process of the axial piston hydraulic seal working chamber device, the change in the volume of the sealed working chamber is not achieved by the telescopic movement of the spherical hinge piston in the sleeve, but by the axial reciprocating movement of the sleeve sleeved at the bottom of the spherical hinge piston. In this motion transmission process, the spherical hinge piston is hinged to the main shaft turntable assembly fixedly connected to the main shaft and has no axial movement, that is, the motion transmission process is not achieved by the extrusion of the piston on the inner surface of the sleeve. There is no radial extrusion during the movement of the spherical hinge piston and the sleeve, avoiding jamming between the sleeve and the piston. At the same time, the sleeve is fixedly installed on the sleeve seat (the sleeve and the sleeve seat can also be tightly fitted and inserted or made into one body), and there is no relative floating between the sleeve and the sleeve seat, ensuring the stability and reliability during the movement process of the device.

[0025] Thirdly, the sealed working chamber in the axial piston hydraulic sealing working chamber device is formed only by the ball-hinged piston and the sleeve. When the sealed working chamber performs energy conversion and motion transmission, it only involves the main shaft turntable assembly and the sleeve seat, without any small and precise connecting parts, thus reducing the manufacturing difficulty and making installation and maintenance more convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions in the embodiments of the present application or related technologies, the following will briefly introduce the drawings required for use in the description of the embodiments or related technologies. Obviously, the drawings in the following description are only the embodiments of the present application. For those of ordinary skill in the art, other drawings can also be obtained based on the provided drawings without creative efforts.

[0027] Figure 1 is a schematic structural diagram of the axial piston hydraulic sealing working chamber device in the embodiment of the present application;

[0028] Figure 2 is Figure 1 an assembly diagram of the sleeve seat, sleeve, ball-hinged piston and main shaft turntable assembly in

[0029] Figure 3 is Figure 1 a cross-sectional view of

[0030] Wherein:

[0031] 1 - Main shaft turntable assembly, 2 - Ball-hinged piston, 3 - Sleeve, 4 - Sleeve seat, 5 - Main shaft, 6 - Key;

[0032] 11 - Main shaft turntable, 12 - Ball-hinged seat, 13 - Ball-hinged pressure plate;

[0033] 21 - Ball hinge, 22 - Tapered cylinder, 23 - Ball table;

[0034] 31 - Socket part, 32 - Connection part. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0035] The following will clearly and completely describe the technical solutions in the embodiments of the present application with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments of the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application.

[0036] To enable those skilled in the art of this technology to better understand the solution of the present application, the following will further elaborate on the present application in combination with the drawings and specific embodiments.

[0037] Please refer to Figure 1 andFigure 2 and Figure 3 The axial piston hydraulic sealing working chamber device provided by the embodiments of the present application includes a main shaft turntable assembly 1, ball-hinged pistons 2, sleeves 3, sleeve seats 4, and a main shaft 5.

[0038] The main shaft turntable assembly 1 can provide hinge points for the ball-hinged pistons 2. The left and right end faces of the main shaft turntable assembly 1 are each hinged with the same number (n) of ball-hinged pistons 2. The main shaft turntable assembly 1 and the main shaft 5 can be fixedly connected or made into one body, and the main shaft turntable assembly 1 rotates with the main shaft 5.

[0039] The ball-hinged piston 2 includes a ball hinge 21, a conical cylinder 22, and a ball table 23. The ball hinge 21 and the ball table 23 are respectively arranged at both ends of the conical cylinder 22, and the diameter of the ball hinge 21 is slightly larger than the diameter of the ball table 23.

[0040] A sleeve seat 4 is provided on each side of the main shaft turntable assembly 1. The end faces of the two sleeve seats 4 facing the main shaft turntable assembly 1 are each fixedly installed with the same number of sleeves 3. For this reason, a plurality (n) of cylindrical through holes are evenly distributed along the circumference on the end face of each sleeve seat 4 facing the main shaft turntable assembly 1 for tightly fitting and fixing the sleeve 3. The ball-hinged pistons 2 on the main shaft turntable assembly 1 are sleeved with the sleeves 3 on the corresponding sleeve seats 4 one by one to form a sealing working chamber between the ball-hinged pistons 2 and the sleeves 3.

[0041] Moreover, the central axis of the sleeve seat 4 has an inclination angle β with respect to the central axis of the main shaft turntable assembly 1. Or rather, the central axes of the sleeve 3 and the ball-hinged piston 2 have an included angle β, and the value of β is generally about 8°.

[0042] The sleeve 3 includes a socket part 31 and a connecting part 32. Both the socket part 31 and the connecting part 32 are hollow cylindrical cylinders and are of an integral structure. The outer diameter of the connecting part 32 is smaller than the outer diameter of the socket part 31. The socket part 31 is sleeved outside the corresponding ball table 23, and the connecting part 32 is used for fixing the sleeve 3 on the sleeve seat 4.

[0043] The main shaft 5 passes through the middle of the main shaft turntable assembly 1 and the two sleeve seats 4, and the main shaft 5 is connected to the sleeve seat 4 so as to rotate synchronously and allow axial offset between the main shaft 5 and the sleeve seat 4. Of course, the main shaft 5 and the sleeve seat 4 can be connected by a key 6.

[0044] It should be noted that the number of sleeves 3 provided between any sleeve seat 4 and the main shaft turntable assembly 1 corresponds to the number of ball-hinged pistons 2 provided, both being n. A sealing working chamber is formed between the ball-hinged piston 2 and the corresponding sleeve 3. A plurality (n) of sealing working chambers with the same number are formed on both sides of the main shaft turntable assembly 1, and the number of sealing working chambers on either side of the main shaft turntable assembly 1 is 9 - 12.

[0045] The axially-piston hydraulic seal working chamber device configured as such has the following beneficial effects:

[0046] First, when the axially-piston hydraulic seal working chamber device (axial piston pump or motor) is operating, it can ensure that when the spherical hinge plunger 2 swings around the axis, one end of the spherical hinge plunger 2 is always tangent to the inner wall of the sleeve 3 with a spherical surface. In this way, when the sleeve 3 is sleeved outside the spherical hinge plunger 2 and makes a reciprocating motion and the sleeve 3 revolves around the main shaft 5, the spherical table 23 of the spherical hinge plunger 2 and the inner wall of the sleeve 3 always maintain an effective line contact seal without dimensional interference. Using line seal has higher efficiency than traditional clearance seal, better seal reliability, and does not require the lengths of the plunger and the sleeve 3 to be relatively large, which can reduce the moment of inertia and thus reduce the harm of pressure shock during rotational commutation.

[0047] Second, regardless of whether it is in pump condition or motor condition, in the entire motion transfer process of the axially-piston hydraulic seal working chamber device, the change in the volume of the sealed working chamber is not achieved by the telescopic movement of the spherical hinge plunger 2 in the sleeve 3, but by the reciprocating motion of the sleeve 3 sleeved at the bottom of the spherical hinge plunger 2 along the axis. During this motion transfer process, the spherical hinge plunger 2 is hinged to the main shaft turntable assembly 1 fixedly connected to the main shaft 5 without axial movement, that is, the motion transfer process is not achieved by the extrusion of the plunger on the inner surface of the sleeve 3. There is no radial extrusion between the spherical hinge plunger 2 and the sleeve 3, avoiding jamming between the sleeve 3 and the plunger. At the same time, the sleeve 3 is fixedly installed on the sleeve seat 4 (the sleeve 3 and the sleeve seat 4 can also be tightly fitted and inserted or made into one body), and there is no relative floating between the sleeve 3 and the sleeve seat 4, ensuring the stability and reliability during the motion process of the device.

[0048] Third, the sealed working chamber in the axially-piston hydraulic seal working chamber device is only formed by two parts, namely the spherical hinge plunger 2 and the sleeve 3. When the sealed working chamber performs energy conversion and motion transfer, it only involves the main shaft turntable assembly 1 and the sleeve seat 4, without small and precise connecting parts, with low manufacturing difficulty and more convenient installation and maintenance.

[0049] It should be emphasized that regarding the working principle of the existing axial piston device: Since the pistons are installed in the piston holes evenly distributed in the cylinder block, the heads of the pistons are equipped with slippers, and the bottom of the slippers always moves along the surface of the swash plate. There is an inclination angle between the surface of the swash plate and the plane of the cylinder block. When the cylinder block drives the pistons to rotate, there is a radial force, which drives the pistons to make linear reciprocating motions in the piston holes. In contrast, in the present application, the sleeve seat 4 and the main shaft turntable assembly 1 are fixed on the main shaft 5, the sleeve 3 is fixed on the sleeve seat 4, and the spherical hinge piston 2 is hinged on the main shaft turntable assembly 1. During the working process, the main shaft 5 drives the sleeve seat 4 and the main shaft turntable assembly 1 to move simultaneously, which can ensure that the sleeve 3 and the spherical hinge piston 2 also rotate simultaneously. When the sleeve 3 and the spherical hinge piston 2 rotate at the same angular velocity, there is no radial extrusion force, only axial reciprocating motion, thus avoiding jamming between the sleeve 3 and the spherical hinge piston 2.

[0050] In some embodiments, the diameter of the conical cylinder 22 tapers in a direction away from the ball table 23. The diameter of the ball table 23 is equal to the inner diameter D of the socket part 31, and the thickness of the ball table 23 is less than or equal to 0.8 times the diameter of the ball table 23, so as to ensure that when the main shaft turntable assembly 1 rotates, the ball table 23 can not only move axially in the socket part 31, but also maintain line contact sealing with the inner cylindrical surface of the socket part 31.

[0051] In some embodiments, for the convenience of assembling the sleeve 3 and the sleeve seat 4, the connecting part 32 can be a threaded connecting part 32. Correspondingly, the connecting hole on the sleeve seat 4 is a threaded connecting hole. In this way, each sleeve 3 can be screwed onto the sleeve seat 4 through threads. Of course, the sleeve 3 and the sleeve seat 4 can also adopt other tight fitting methods or be integrally formed.

[0052] In this way, since the sleeve 3 and the sleeve seat 4 are fixedly installed (or integrally formed), when the sleeve seat 4 pulls out or presses in the sleeve 3, there is no need to consider the strength of the connecting parts, nor will the parts of the sealed working chamber be deformed, thus affecting the fit or sealing.

[0053] For the convenience of hinging the spherical hinge 21 to the main shaft turntable assembly 1, the main shaft turntable assembly 1 includes a main shaft turntable 11, a spherical hinge seat 12 and a spherical hinge pressing plate 13.

[0054] Specifically, the main shaft turntable 11 is of a disc-shaped structure. A number of spherical hinge seats 12 are provided on each of the left and right end faces of the main shaft turntable 11. The spherical hinge 21 is nested in the spherical hinge seat 12. The spherical hinge pressing plates 13 are installed on the left and right end faces of the main shaft turntable 11. The through holes opened on the spherical hinge pressing plates 13 can allow the ball table 23 to pass through, but restrict the movement of the spherical hinge 21 in the corresponding spherical hinge seat 12.

[0055] Furthermore, the sealed working chambers on the left and right sides of the main shaft turntable assembly 1 can be arranged staggeredly with each other. This is equivalent to at least 24 sealed working chambers generating energy conversion successively per revolution, and the pulsation of the output torque or pressure is reduced a lot.

[0056] Specifically, the number of ball hinge seats 12 on the left and right end faces of the main shaft turntable 11 is the same (both are n) and they are evenly distributed along the circumferential direction. The circles formed by the ball hinge seats 12 on the left and right end faces of the main shaft turntable 11 are concentric and have the same diameter, and the ball hinge seats 12 on the left and right end faces of the main shaft turntable 11 are distributed with a certain phase angle offset.

[0057] Furthermore, the phase angle offset between adjacent ball hinge seats 12 located on the left and right end faces of the main shaft turntable 11 respectively is half of the central angle corresponding to two adjacent ball hinge seats 12 on the same end face of the main shaft turntable 11 (360 / 2n degrees).

[0058] For example, 12 (when the diameter of the main shaft turntable assembly 1 is relatively large, 16 can also be taken) hemispherical ball hinge seats 12 are machined on each of the left and right circular end faces of the main shaft turntable assembly 1 for installing the ball hinges 21 of the ball hinge plungers 2. The centers of the 12 hemispherical ball hinge seats 12 on the left or right circular end face are evenly distributed on the indexing circumference. The central angle between the centers of every two adjacent hemispherical ball hinge seats 12 on the same circular end face to the center of the main shaft turntable assembly 1 is 30°, and the central angle between the centers of every two adjacent hemispherical ball hinge seats 12 on the left and right sides to the center of the main shaft turntable assembly 1 is 15°. Or rather, the ball hinge seats 12 on one end face are located between two adjacent ball hinge seats 12 on the corresponding other end face, so as to achieve the purpose of staggering.

[0059] It should be noted that in the prior art, due to the inability to increase the diameter of the cylinder block, it is very difficult to make the number of plunger chambers in the cylinder block greater than 9. Therefore, the output pressure pulsation and output torque pulsation of various existing axial hydraulic pumps or hydraulic motors cannot be reduced, and the transmission smoothness is limited. In contrast, since the space occupied by the sleeve 3 is much smaller than that of the cylinder block plunger chamber, 9 - 12 sealed working chambers can be arranged on either side of the main shaft turntable assembly 1. That is, at least 24 sealed working chambers in this application generate energy conversion successively per revolution, the pulsation of the output torque or pressure is reduced a lot, and the smoothness of the output torque is much better, greatly improving the transmission smoothness.

[0060] In addition, the sealed working chambers can also be symmetrically arranged on both sides of the main shaft turntable assembly 1, so as to form a coaxial double-pump (or motor) working condition. When the respective inlet channels on both sides are in parallel and the outlet channels are also in parallel, it can be used as a hydraulic pump (or hydraulic motor); when only the inlet (or outlet) channels on both sides are in parallel and the outlet (or inlet) channels on both sides are respectively used as external oil ports, it can directly be used as a three-oil-port hydraulic transformer.

[0061] It should be noted that a hydraulic pump converts the input mechanical energy into hydraulic energy for output, while a hydraulic motor converts the input hydraulic energy into mechanical energy for output. For positive displacement hydraulic pumps and motors, the necessary conditions for achieving this energy conversion are as follows: there is a sealed working chamber, and the volume of this working chamber can be changed. When mechanical energy causes the volume of the working chamber to decrease, hydraulic energy is output, which is the working condition of a hydraulic pump; when hydraulic energy causes the volume of the working chamber to increase, mechanical energy is output, which is the working condition of a hydraulic motor. The sealed working chamber with a variable volume is the functional component that enables a positive displacement hydraulic pump or motor to achieve energy conversion. The sealed working chamber of an axial piston pump or motor includes three basic elements: one is the parts that form the variable volume working chamber including the plunger, which have reliable sealing with each other; the second is that the plunger or sleeve 3 that forms the working chamber can perform an axial linear motion to change the volume of the working chamber under the action of hydraulic energy or mechanical energy; the third is a mechanism that transmits and converts the linear motion of the plunger or sleeve 3 and the rotational motion of the main shaft 5 to each other. Therefore, a sealed working chamber with a variable volume that has good performance and a reasonable structure is a necessary condition for constructing an excellent axial piston hydraulic pump or hydraulic motor. For this reason, the present application provides an innovative device for a sealed working chamber with a variable volume.

[0062] Specifically, the sleeve 3 is slidably sleeved on the corresponding ball table 23, and the sleeve 3 is configured to form a sealed working chamber with a variable volume with the corresponding spherical hinge plunger 2 during the sliding process. In the device of the present application, the sealed working chamber is composed of the spherical hinge plunger 2 and the sleeve 3, and plays a role in the conversion of hydraulic energy and mechanical energy in the axial piston hydraulic sealed working chamber device.

[0063] When the axial piston hydraulic sealed working chamber device is in the pump working condition, the main shaft 5 drives the main shaft turntable assembly 1 and the sleeve seat 4 to rotate synchronously. While the sleeve seat 4 inclined relative to the main shaft turntable assembly 1 is rotating, it pulls out or presses the corresponding sleeve 3 into the corresponding spherical hinge plunger 2, completing the reciprocating movement of the axes of each sleeve 3, and simultaneously sucking in or discharging the liquid medium. When the axial piston hydraulic sealed working chamber device is in the motor working condition, the liquid medium enters the sealed working chamber. Since the sleeve seat 4 is inclined relative to the main shaft turntable assembly 1 (there is an included angle β between their central axes), therefore, the hydraulic resultant force received by the spherical hinge plunger 2 has a radial component force, and this component force acts on the main shaft turntable assembly 1, causing the main shaft 5 to generate a driving torque for output.

[0064] It should be emphasized that the change in the volume of the sealed working chamber of the present application is not achieved by the telescopic movement of the spherical hinge plunger 2 in the sleeve 3, but by the reciprocating movement of the sleeve 3 sleeved outside the spherical hinge plunger 2 along the axis of the spherical hinge plunger 2. At this time, the spherical hinge plunger 2 assembled on the turntable has no axial movement.

[0065] In some embodiments, a plurality of pressure equalizing grooves for establishing oil film pressure are provided on the end face of the sleeve seat 4 facing away from the main shaft turntable assembly 1.

[0066] Among them, the outer shape of the sleeve seat 4 is like a flange with a bushing, which is sleeved on the main shaft 5, connected by a key, and rotates with the main shaft 5. n pin through holes are evenly distributed on the circumference of the flange of the sleeve seat 4 for inserting the sleeve 3. The end face of the sleeve seat 4 facing away from the main shaft turntable assembly 1 can be a plane or a spherical surface (for centering), and is machined with pressure equalizing grooves for establishing oil film pressure. During operation, the sleeve seat 4 is pressed against the swash plate under the action of the hydraulic pressure of the sleeve 3 and has an included angle β with the axis of the main shaft 5.

[0067] It should be noted that the necessary condition for the sealing working chamber to maintain sealing when the volume changes is that the connection between the ball hinge plunger 2 and the main shaft turntable assembly 1 is not fixed, but a ball hinge 21 connection, and the ball hinge plunger 2 can swing around the axis; at the same time, the bottom of the ball hinge plunger 2 is a ball table 23 with a diameter equal to the inner diameter D of the sleeve 3, and the thickness of the ball table 23 is sufficient to ensure that when the ball hinge plunger 2 swings around the axis, the bottom of the ball hinge plunger 2 always tangentially contacts the inner wall of the sleeve 3 with a spherical surface. In this way, it is ensured that when the sleeve 3 reciprocates axially outside the ball hinge plunger 2 and the sleeve 3 revolves around the main shaft 5, the bottom of the plunger and the inner wall of the sleeve 3 always maintain effective line contact sealing and there is no dimensional interference.

[0068] In addition, for the axial piston hydraulic sealing working chamber device of the present application, the mechanism for transmitting the axial reciprocating motion of the sleeve 3 sleeved outside the plunger and the rotational motion of the main shaft 5 is the main shaft turntable assembly 1 with a hinged mounted ball hinge plunger 2 fixedly connected to (or made integrally with) the main shaft 5 and the sleeve seat 4 for fixedly mounting the sleeve 3, and the central axes of the main shaft turntable assembly 1 and the sleeve seat 4 have an included angle β (that is, the axes of the sleeve 3 and the plunger have an included angle β), and the value of β is generally about 8°.

[0069] In some embodiments, the sealing working chambers are symmetrically arranged on both sides of the main shaft turntable assembly 1. For example, there are n sealing working chambers on each of the left and right sides of the main shaft turntable assembly 1, and the value range of n is 9 - 12.

[0070] It should be noted that in the existing axial piston working device, large unbalanced hydraulic axial forces are borne on both the plunger and the cylinder block, and these forces will be transmitted to the main shaft 5 or the swash plate. Therefore, when using the existing axial piston hydraulic pump or hydraulic motor, it is necessary to configure large-diameter bearings with large load-carrying capacity, and the performance of the bearings limits the increase of the cylinder block diameter and the improvement of the rotational speed.

[0071] If the hydraulic pressures p1 and p2 of each pair of adjacent sealed working chambers on the left and right sides are equal, the axial components Fp1·cosβ and Fp2·cosβ of the hydraulic forces Fp1 and Fp2 acting on the ball table 23 of the ball hinge plunger 2 cancel each other out, and the axial resultant force on the main shaft turntable assembly 1 is 0; the radial components Fp1·sinβ and Fp2·sinβ of the hydraulic force generate a torque on the main shaft turntable assembly 1, which balances the load torque (for the motor condition) or the driving torque (for the pump condition). Therefore, there is no unbalanced axial hydraulic pressure in the axial piston hydraulic sealed working chamber device of the present application, and the radial force acting on the main shaft 5 is small (the value of sinβ is very small), so the main shaft 5 of the axial piston hydraulic pump or motor adopting the present application can be designed as a simply supported beam structure, and only small-diameter ball bearings need to be arranged at both ends of the main shaft 5, so that the rotational speed can be unrestricted by the maximum rotational speed of the large-diameter bearings.

[0072] Meanwhile, since the hydraulic axial forces acting on the main shaft 5 and the main shaft turntable assembly 1 reach balance and the radial force is very small, it is beneficial to improve the rotational speed and service life of the hydraulic pump or hydraulic motor.

[0073] Generally speaking, the axial piston hydraulic sealed working chamber device of the present application includes, on either side of the main shaft turntable assembly 1, 1 sleeve seat 4, 12 sleeves 3, and 1 shaft sleeve ring. The sleeve seat 4 is a flange with a bushing, and it is sleeved on the main shaft 5. The contact surface between the bushing of the sleeve seat 4 and the main shaft 5 is inlaid with a copper shaft sleeve ring, and 2 - 4 axial key grooves are opened on the inner side of the bushing of the sleeve seat 4. 12 cylindrical through holes are evenly distributed on the indexing circumference of the sleeve seat 4, and pressure equalizing grooves for establishing oil film pressure are machined on the back of the sleeve seat 4. The sleeve 3 can withstand a hydraulic pressure of 42 Mpa, and its bottom is a connecting part 32 with a smaller diameter (specifically a round pipe stud). The round pipe stud is inserted into the cylindrical through hole of the sleeve seat 4 with a tight fit tolerance to fixedly connect the sleeve 3 and the sleeve seat 4; alternatively, 12 sleeves 3 and the sleeve seat 4 can also be made as one part and machined integrally. After the sleeve 3 and the sleeve seat 4 are assembled and machined, it should be ensured that the central axes of the sleeves 3 are parallel to the central axis of the sleeve seat 4, and the bottom surface of the sleeve seat 4 is in contact with the oil distribution window surface of the oil distribution plate, and the contact surface is a spherical surface with pressure equalizing grooves.

[0074] In some embodiments, the end face of the sleeve seat 4 facing away from the main shaft 5 and the main shaft turntable assembly 1 is assembled with the oil distribution plate, and the oil distribution plate is used to supply or drain oil to the sealed working chamber.

[0075] Specifically, the axial piston hydraulic sealed working chamber device further includes a front housing, a rear housing, a first oil distribution swash plate, and a second oil distribution swash plate. The first oil distribution swash plate and the second oil distribution swash plate integrate the functions of the existing oil distribution plate and swash plate of the axial piston motor.

[0076] Among them, the front housing is provided with a first oil inlet passage and a first oil outlet passage. The rear housing is connected to the front housing. The rear housing is provided with an oil inlet, an oil outlet, a second oil inlet passage and a second oil outlet passage. The oil inlet is communicated with the first oil inlet passage and the second oil inlet passage, and the oil outlet is communicated with the first oil outlet passage and the second oil outlet passage. The first oil distribution swash plate and the second oil distribution swash plate are respectively located on the side of the two sleeve seats 4 away from the main shaft turntable assembly 1. The first oil distribution swash plate is provided with a first oil inlet window and a first oil outlet window. The first oil inlet window is communicated with the first oil inlet passage, and the first oil outlet window is communicated with the first oil outlet passage. The second oil distribution swash plate is provided with a second oil inlet window and a second oil outlet window. The second oil inlet window is communicated with the second oil inlet passage, and the second oil outlet window is communicated with the second oil outlet passage.

[0077] In this way, the hydraulic oil entering from the oil inlet, one way enters the sealed working chamber on one side of the main shaft turntable assembly 1 through the first oil inlet passage and the first oil inlet window. After that, the hydraulic oil in this sealed working chamber flows out from the oil outlet through the first oil outlet window and the first oil outlet passage. The other way enters the sealed working chamber on the other side of the main shaft turntable assembly 1 through the second oil inlet passage and the second oil inlet window. After that, the hydraulic oil in this sealed working chamber flows out from the oil outlet through the second oil outlet window and the second oil outlet passage.

[0078] In some embodiments, friction contact layers are provided on the surfaces of the first oil distribution swash plate and the second oil distribution swash plate that contact the corresponding sleeve seats 4.

[0079] In this embodiment, a layer of copper alloy is sintered on the surfaces of the first oil distribution swash plate and the second oil distribution swash plate that contact the corresponding sleeve seats 4, so as to improve the service life of the oil distribution swash plate.

[0080] It should be noted that in this specification, relational terms such as first and second are only used to distinguish one entity from several other entities, and do not necessarily require or imply any such actual relationship or order between these entities.

[0081] The above has introduced in detail the axial piston hydraulic sealed working chamber device provided by the present application. Specific examples are used in this article to elaborate on the principle and implementation manner of the present application. The description of the above embodiments is only used to help understand the solution of the present application and its core idea. It should be pointed out that for those of ordinary skill in the art in this technical field, without departing from the principle of the present application, several improvements and modifications can still be made to the present application, and these improvements and modifications also fall within the protection scope of the present application.

Claims

1. An axial piston hydraulic sealing working chamber device, characterized in that, It comprises a spindle turntable assembly (1), a ball joint plunger (2), a sleeve (3), a sleeve seat (4) and a spindle (5); The two end surfaces of the spindle turntable assembly (1) are each hingedly connected with the same number of ball joint plungers (2); The ball joint plunger (2) comprises a ball joint (21), a tapered cylinder (22) and a ball table (23), wherein the ball joint (21) and the ball table (23) are respectively arranged at two ends of the tapered cylinder (22); A sleeve seat (4) is provided on each side of the spindle turntable assembly (1); the central axis of the sleeve seat (4) has an inclination angle β relative to the central axis of the spindle turntable assembly (1); the end surfaces of the two sleeve seats (4) facing the spindle turntable assembly (1) are each fixed with the same number of sleeves (3); the ball joint plunger (2) on the spindle turntable assembly (1) is sleeved with the sleeve (3) on the sleeve seat (4) on the corresponding side in a one-to-one correspondence, so as to form a sealed working chamber between the ball joint plunger (2) and the sleeve (3); The sleeve (3) comprises a sleeve connection portion (31) and a connecting portion (32); the sleeve connection portion (31) and the connecting portion (32) are both hollow cylindrical cylinders and are an integrated structure; the sleeve connection portion (31) is sleeved on the outside of the corresponding ball table (23); and the connecting portion (32) is used for fixing the sleeve (3) on the sleeve seat (4); The main shaft (5) passes through the middle of the main shaft turntable assembly (1) and the two sleeve seats (4), and the main shaft (5) and the sleeve seats (4) are connected so as to rotate synchronously and allow axial offset between the main shaft (5) and the sleeve seats (4).

2. The axial piston hydraulic seal working chamber device according to claim 1, characterized in that, The spindle turntable assembly (1) comprises a spindle turntable (11), a ball joint seat (12) and a ball joint pressure plate (13); The spindle turntable (11) is a disc-shaped structure. The two end surfaces of the spindle turntable (11) are each provided with a plurality of the ball joint seats (12). The ball joint (21) is nested in the ball joint seat (12). The ball joint pressure plate (13) is installed on the two end surfaces of the spindle turntable (11). The through hole provided on the ball joint pressure plate (13) allows the ball table (23) to pass through, but limits the movement of the ball joint (21) in the corresponding ball joint seat (12).

3. The axial piston hydraulic sealing working chamber device according to claim 2, characterized in that, The ball joint seats (12) on the two end surfaces of the spindle turntable (11) are the same in number and are evenly distributed along the circumferential direction; the circles formed by the ball joint seats (12) on the two end surfaces of the spindle turntable (11) are concentric and have the same diameter; and the ball joint seats (12) on the two end surfaces of the spindle turntable (11) are staggered at a certain phase angle.

4. The axial piston hydraulic sealing working chamber device according to claim 3, characterized in that, The staggered phase angle of the adjacent ball joint seats (12) respectively located on two end surfaces of the spindle turntable (11) is half of the corresponding central angle of the two adjacent ball joint seats (12) on the same end surface of the spindle turntable (11).

5. The axial piston hydraulic seal working chamber device according to claim 1, characterized in that, The diameter of the ball table (23) is equal to the inner diameter of the socket part (31), and the thickness of the ball table (23) is less than 0.8 times the diameter of the ball table (23), so as to ensure that when the main shaft turntable assembly (1) rotates, the ball table (23) can not only axially move within the socket part (31), but also maintain line contact sealing with the inner cylindrical surface of the socket part (31).

6. The axial piston hydraulic sealing working chamber device according to claim 1, wherein, The end face of the sleeve seat (4) facing away from the main shaft turntable assembly (1) is fitted with an oil distribution plate, and the oil distribution plate is used to supply oil or drain oil to the sealing working chamber.

7. The axial piston hydraulic sealing working chamber device according to claim 1, characterized in that, A pin key (6) is used to connect the main shaft (5) and the sleeve seat (4).

8. The axial piston hydraulic sealing working chamber device according to claim 1, characterized in that, The number of the sealing working chambers on either side of the main shaft turntable assembly (1) is 9 - 12.

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