A spherical floating distribution type high speed servo motor pump

Abstract

The present invention discloses a spherical floating distribution type high speed servo motor pump comprising: a permanent magnet synchronous motor I, a bidirectional quantitative plunger pump core II and a motor pump housing 1; a permanent magnet synchronous motor stator 2 is placed in the second cavity of the motor pump housing 1 in an interference fit manner, and a first flat key 8 is used to prevent circumferential rotation; a bidirectional quantitative plunger pump core II, a first bearing 11, a permanent magnet synchronous motor rotor assembly 3, a second bearing 12, and a rotary transformer 10 are axially connected in series on a motor pump shaft 9 from left to right; a rear end cover 4 and a motor pump housing 1 are radially sealed by a double-pass first sealing ring 5, and a conveniently detachable electrical connector end cover 6 is provided on the right side of the rear end cover 4, forming a radial seal with a double-pass second sealing ring 7. The present invention ensures the local uniformity of the distribution pair oil film, reduces the wear and leakage of the distribution pair, and achieves the index of high power density by increasing the working speed and reducing the volume and weight while meeting the flow requirements.

Description

Technical Field

[0001] The invention relates to a spherical floating flow distribution type high-speed servo motor pump, belonging to the technical field of servo motors. Background Art

[0002] The servo motor pump is the hydraulic power unit of the servo system and is widely used in electromechanical hydrostatic servo systems. Electromechanical hydrostatic servo mechanisms (EHA, Electro-Hydraulic Actuators) are the preferred technical solution for future large thrust vector servo control. At present, the typical EHA adopts a variable speed fixed displacement type, that is, by controlling the speed and direction of the servo motor to change the flow and direction of the hydraulic oil output by the bidirectional fixed displacement pump, so as to achieve the purpose of controlling the output speed and direction of the actuator. The servo motor and the bidirectional fixed displacement pump are structurally designed as a whole, which is called a servo motor pump (also called a servo electric pump, electro-hydraulic pump, etc.). The servo motor pump is the core power component of the EHA.

[0003] In view of the extreme requirements of EHA for weight reduction, it is necessary to use servo motor pumps with small size and light weight as much as possible, forcing the servo motor pumps to develop in the direction of high speed, that is, to reduce their own displacement and size through high speed, so as to make the whole system more compact and lightweight. In the internationally advanced EHA, the pump speed is generally not less than 10000r / min, and the PV3-003 high-speed plunger pump of Eaton Company in the United States can reach 22500r / min.

[0004] However, domestic plunger pumps often overturn under high-speed conditions, which is manifested as: wear on the bottom of the pump cylinder, reduced output flow, reduced volumetric efficiency, and even inability to achieve the action change of the actuator in severe cases. There is a large gap between domestic plunger pumps and foreign products in high-speed performance, and my country's dependence on imported high-speed plunger pumps remains high.

[0005] Traditional inclined plate piston pumps mostly use the "spherical floating pump cylinder + spherical fixed distribution plate" method to increase the operating speed. Although the spherical structure increases the contact area between the pump cylinder and the distribution plate and reduces the linear speed of the friction pair, it does not fundamentally solve the overturning problem. The high-speed rotating pump cylinder will still tilt due to unbalanced force. At this time, if the processing accuracy of the pump cylinder and the distribution plate is poorly matched, the two will not be able to maintain a tight fit, and long-term operation will cause serious wear of the distribution pair, increase leakage and reduce effective output flow. In addition, since the concave spherical surface on the spherical pump cylinder has the characteristics of high dimensional tolerance and form and position tolerance accuracy, the manufacturing process of the pump cylinder is difficult, and the actual processed products often cannot meet the performance requirements of the servo system.

[0006] In the face of ever-diversifying application demands and in response to increasingly stringent requirements for miniaturization, lightweight, and high power density, it is urgent to develop new servo motor pump unit products that integrate high-speed, high-performance, motors, and plunger pumps. Summary of the invention

[0007] The technical problem solved by the present invention is: to overcome the shortcomings of the prior art and provide a spherical floating distribution type high-speed servo motor pump, which ensures the local uniformity of the oil film of the distribution pair, reduces the wear and leakage of the distribution pair, and achieves the index of high power density by increasing the working speed, reducing the volume and weight while meeting the flow requirements.

[0008] The technical solution of the present invention is:

[0009] The invention discloses a spherical floating flow distribution type high-speed servo motor pump, comprising: a permanent magnet synchronous motor, a bidirectional quantitative plunger pump core and a motor pump housing;

[0010] The motor pump housing includes: a first cavity and a second cavity;

[0011] The permanent magnet synchronous motor comprises: a permanent magnet synchronous motor stator, a permanent magnet synchronous motor rotor assembly, a rear end cover, a first sealing ring, an electrical connector end cover, a second sealing ring, a first flat key, a motor pump shaft, a rotary transformer, a first bearing, and a second bearing;

[0012] The stator of the permanent magnet synchronous motor is placed in the second cavity of the motor pump housing by interference fit, and the first flat key is used to prevent circumferential rotation; the bidirectional quantitative plunger pump core is placed in the first cavity of the motor pump housing; the bidirectional quantitative plunger pump core, the first bearing, the permanent magnet synchronous motor rotor assembly, the second bearing, and the rotary transformer are axially connected in series on the motor pump shaft from left to right; the rear end cover and the motor pump housing are radially sealed by a double-pass first sealing ring, and there is an easily removable electrical connector end cover on the right side of the rear end cover, which forms a radial seal with the double-pass second sealing ring.

[0013] In the above-mentioned spherical floating distribution type high-speed servo motor pump, the bidirectional quantitative plunger pump core includes: a spherical floating distribution assembly, a balanced pump cylinder assembly, and a screw-fixed return assembly, the three of which are connected in series from left to right; the spherical floating distribution assembly is fixedly connected to the motor pump housing; the spherical floating distribution assembly includes a spherical distribution plate, the balanced pump cylinder assembly includes a pump cylinder body and a second flat key, and the spherical distribution plate is in plane contact with the pump cylinder body; the screw-fixed return assembly includes a slanted plate, a sliding shoe plunger assembly, and a second locating pin, the sliding shoe plunger assembly includes a plunger and a sliding shoe, the plunger and the sliding shoe are fixedly connected, and the plunger is inserted into the plunger hole in the pump cylinder body.

[0014] In the above-mentioned spherical floating distribution type high-speed servo motor pump, the motor pump shaft uses the second flat key to drive the balanced pump cylinder assembly to rotate; the second positioning pin is used to prevent the module from rotating relative to the motor pump housing.

[0015] In the above-mentioned spherical floating distribution type high-speed servo motor pump, the spherical floating distribution assembly includes a spherical end cover, a third sealing ring, a ball stud, and a spherical distribution plate; the spherical end cover is fixedly connected to the motor pump housing; the first end face of the spherical distribution plate is a planar structure, which is in contact with the plane of the pump cylinder body; the second end face is a convex spherical structure, which is in contact with the spherical surface of the spherical end cover; the spherical distribution plate and the spherical end cover are both provided with oil inlet and oil outlet waist-shaped grooves to provide oil circulation channels.

[0016] In the above-mentioned spherical floating distribution type high-speed servo motor pump, a special-shaped sealing groove is provided on the spherical end cover, and a third sealing ring is installed to achieve oil sealing and provide pre-compression force, so that the spherical distribution plate automatically adheres to the pump cylinder body when the motor pump is not pressurized or not started.

[0017] In the above-mentioned spherical floating distribution type high-speed servo motor pump, one end of the ball pin is a cylindrical structure, which is arranged in the spherical end cover to limit the spherical distribution plate to prevent the spherical distribution plate from rotating relative to the spherical end cover. The other end of the ball pin is a spherical structure, which is arranged in the spherical distribution plate to realize the rotation of the spherical distribution plate; when the pump cylinder body rotates due to bending and deformation of the motor pump shaft, the spherical distribution plate rotates accordingly.

[0018] In the above-mentioned spherical floating distribution type high-speed servo motor pump, the end face of the pump cylinder body near the spherical distribution disk is a planar structure, and after being tightly attached to the spherical distribution disk, a planar distribution structure is formed; the pump cylinder body is connected to the motor pump shaft through a second flat key, and the torque is transmitted by the side of the keyway; the pump cylinder body and the motor pump shaft are fixedly connected in the axial direction.

[0019] In the above-mentioned spherical floating distribution type high-speed servo motor pump, the second flat key and nut are used to achieve no relative movement between the pump cylinder and the motor pump shaft; the first bearing and the second bearing on the motor pump shaft bear the axial eccentric load and the plunger centrifugal force acting on the pump cylinder, thereby achieving force balance of the pump cylinder and solving the problem of overturning movement caused by unbalanced force on the pump cylinder.

[0020] In the above-mentioned spherical floating distribution type high-speed servo motor pump, the screw-fixed return assembly also includes a retaining ring, a sleeve, a screw, a pressure plate, a chuck, a washer, a swash plate, and a first positioning pin; the swash plate is installed in the first cavity of the motor pump housing, and the second positioning pin is used to prevent the swash plate from rotating relative to the motor pump housing; the washer is installed in the swash plate, and the first positioning pin is used to prevent the washer from rotating relative to the swash plate; the pressure plate and the swash plate are fixedly connected by screws to form a cavity structure composed of the pressure plate and the washer.

[0021] In the above-mentioned spherical floating distribution type high-speed servo motor pump, the slipper and chuck of the slipper plunger assembly are placed in the cavity structure, the chuck is installed under the pressure plate, the slipper passes through the mounting hole on the chuck, and contacts with the pad plate plane; the pressure plate fixed by screws limits the slipper from being separated from the pad, and constrains the slipper to move in a direction parallel to the pad; the retaining ring and the sleeve are used to constrain the inclined plate from being separated from the first cavity of the motor pump housing.

[0022] The beneficial effects of the present invention and the prior art are:

[0023] (1) The present invention adopts a spherical floating distribution structure: an innovative design of a spherical end cover + spherical distribution plate + fixed pump cylinder structure. One side of the distribution plate forms a planar distribution structure with the high-speed rotating pump cylinder, and one side forms a spherical distribution structure with the stationary end cover. When the pump cylinder is slightly tilted due to the bending deformation of the rotating shaft, the distribution plate maintained in a "floating state" can also be slightly tilted to ensure the local uniformity of the oil film of the distribution pair. When the distribution plate is slightly tilted, due to the good self-positioning performance of the spherical structure, the distribution plate and the end cover can still maintain good contact, reducing oil leakage. The pump cylinder is rigidly connected to the shaft, and the bearing balances the axial eccentric load and the centrifugal force of the plunger acting on the cylinder, thereby enhancing the cylinder's anti-overturning ability and stability and increasing the operating speed. At the same time, the pump cylinder structure is simplified by eliminating the spline, and the production process is better.

[0024] (2) The present invention adopts a screw-tightening fixed-gap return mechanism: by tightening the screw limit chuck and adjusting the thickness of the pad, the oil film gap of the sliding shoe pair is adjusted. This structure, which does not use a spring as the plunger return, enhances the sliding shoe's anti-overturning ability, reduces the wear and leakage of the sliding shoe pair, and avoids the phenomenon of reducing the life of the pump due to long-term use of the spring, thereby improving working reliability.

[0025] (3) The present invention adopts a through-shaft, common-shell, highly integrated structure: the plunger pump and servo motor adopt a through-shaft design, are arranged in a straight line and share a common shaft, and have a compact structure. The permanent magnet synchronous motor and the bidirectional quantitative plunger pump core share a housing, which not only obtains a compact structure, but also solves the problem of oil leakage from the plunger pump shaft seal mechanical seal.

[0026] (4) The servo motor pump housing of the present invention adopts double-pass radial sealing to improve sealing reliability.

[0027] (5) The present invention enhances the anti-overturning ability and stability of the plunger pump, can achieve bidirectional high-speed indicators, has both power and control functions, and directly drives the actuator to work. The spherical floating distribution type high-speed servo motor pump improves the working speed, reduces the volume and weight, and achieves the high power density indicator while meeting the flow requirements. The spherical floating distribution type servo motor pump has a high speed, high power density, and high reliability, and has strong applicability to special purposes (such as aviation, aerospace, small robots, etc.). BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 This is a structural diagram of the spherical floating distribution type high-speed servo motor pump of the present invention;

[0029] Figure 2 This is a stator installation diagram of the permanent magnet synchronous motor of the present invention;

[0030] Figure 3 This is a diagram of a high reliability sealing structure of the present invention;

[0031] Figure 4 This is a structural diagram of a bidirectional quantitative plunger pump core of the present invention;

[0032] Figure 5 This is a diagram of the spherical floating flow distribution structure of the present invention;

[0033] Figure 6 This is a structural diagram of the balanced pump cylinder of the present invention;

[0034] Figure 7 This is a diagram of the screw-fixed return structure of the present invention.

[0035] Explanation of the numbers in the figure: Ⅰ-permanent magnet synchronous motor; Ⅱ-bidirectional quantitative plunger pump core; 1-motor pump housing; 2-permanent magnet synchronous motor stator; 3-permanent magnet synchronous motor rotor assembly; 4-rear end cover; 5-first sealing ring; 6-electric connector end cover; 7-second sealing ring; 8-first flat key; 9-motor pump shaft; 10-rotating transformer; 11-first bearing; 12-second bearing; 13-spherical distribution plate; 14-spherical end cover; 15-third sealing ring; 16-ball pin; 17-spherical distribution plate; 18-pump cylinder; 19-second flat key; 20-nut; 21-retaining ring; 22-sleeve; 23-screw; 24-pressure plate; 25-chuck; 26-washer plate; 27-swash plate; 28-slipper plunger assembly; 29-first locating pin; 30-second locating pin. DETAILED DESCRIPTION

[0036] The present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0037] like Figure 1As shown, the present invention discloses a spherical floating distribution type high-speed servo motor pump, comprising: a permanent magnet synchronous motor I, a bidirectional quantitative plunger pump core II and a motor pump housing 1;

[0038] The motor pump housing 1 comprises: a first cavity and a second cavity;

[0039] The permanent magnet synchronous motor I comprises: a permanent magnet synchronous motor stator 2, a permanent magnet synchronous motor rotor assembly 3, a rear end cover 4, a first sealing ring 5, an electrical connector end cover 6, a second sealing ring 7, a first flat key 8, a motor pump shaft 9, a rotary transformer 10, a first bearing 11, and a second bearing 12;

[0040] The permanent magnet synchronous motor stator 2 is placed in the second cavity of the motor pump housing 1 in an interference fit manner, and is prevented from circumferential rotation by a first flat key 8. Figure 2 ; The bidirectional quantitative plunger pump core II is placed in the first cavity of the motor pump housing 1; the bidirectional quantitative plunger pump core II, the first bearing 11, the permanent magnet synchronous motor rotor assembly 3, the second bearing 12, and the rotary transformer 10 are axially connected in series on the motor pump shaft 9 from left to right; the rear end cover 4 and the motor pump housing 1 are radially sealed by a double-pass first sealing ring 5, and there is an easily removable electrical connector end cover 6 on the right side of the rear end cover 4, which forms a radial seal with the double-pass second sealing ring 7, see Figure 3 The permanent magnet synchronous motor I and the bidirectional quantitative plunger pump core II adopt a coaxial, common shell and highly integrated design, which is compact in structure and conducive to reducing the overall dimensions. At the same time, it avoids the mechanical seal structure and solves the problem of mechanical seal oil leakage. In addition, the external seal adopts a double-pass radial seal to improve the sealing reliability.

[0041] The bidirectional quantitative plunger pump core II includes: spherical floating distribution component a, balanced pump cylinder component b, and screw-fixed return component c. The three are connected in series from left to right. Figure 4 ; The spherical floating distribution assembly a is fixedly connected to the motor pump housing 1 by screws; the spherical floating distribution assembly a includes a spherical distribution plate 17, the balanced pump cylinder assembly b includes a pump cylinder 18 and a second flat key 19, and the spherical distribution plate 17 is in plane contact with the pump cylinder 18; the screw-fixed return assembly c includes a slant plate 27, a slipper plunger assembly 28, and a second positioning pin 30, and the slipper plunger assembly 28 includes a plunger and a slipper, and the plunger and the slipper are fixedly connected, and the plunger is inserted into the plunger hole in the pump cylinder 18. The motor pump shaft 9 uses the second flat key 19 to drive the balanced pump cylinder assembly b to rotate; the second positioning pin 30 is used to prevent the module c from rotating relative to the motor pump housing 1.

[0042] The spherical floating distribution assembly a includes a spherical end cover 14, a third sealing ring 15, a ball pin 16, and a spherical distribution plate 17; the spherical end cover 14 is fixedly connected to the motor pump housing 1 by screws; the first end face of the spherical distribution plate 17 is a planar structure, in planar contact with the pump cylinder 18; the second end face is a convex spherical structure, in spherical contact with the spherical end cover 14; the spherical distribution plate 17 and the spherical end cover 14 are both provided with waist-shaped grooves for oil inlet and outlet, providing oil circulation channels. The spherical end cover 14 is provided with a special-shaped sealing groove, and the third sealing ring 15 is installed to achieve oil sealing and provide pre-compression force, so that the spherical distribution plate 17 automatically adheres to the pump cylinder 18 when the motor pump is not pressurized or not started. When the servo motor pump is working, the high-pressure oil exerts a hydraulic pressure F on the spherical distribution plate 17. 1 Slightly larger than the hydraulic pressure F of the high pressure oil in the plunger cavity on the bottom of the plunger cavity 2 , so that the spherical distribution plate 17 always presses the pump cylinder body 18.

[0043] One end of the ball pin 16 is a cylindrical structure, which is arranged in the spherical end cover 14 to limit the spherical distribution plate 17 to prevent the spherical distribution plate 17 from rotating relative to the spherical end cover 14. The other end of the ball pin 16 is a spherical structure, which is arranged in the spherical distribution plate 17 to realize the rotation of the spherical distribution plate 17; when the pump cylinder 18 rotates at a small angle due to the bending deformation of the motor pump shaft 9, the spherical distribution plate 17 also rotates accordingly to ensure the local uniformity of the oil film of the distribution pair. Figure 5 When the spherical distribution disc 17 rotates slightly, the spherical distribution disc 17 and the spherical end cover 14 can still maintain good contact due to the good self-positioning performance of the spherical structure, thereby reducing oil leakage and improving sealing performance.

[0044] The end surface of the pump cylinder 18 near the spherical distribution plate 17 is a flat structure. After being closely attached to the spherical distribution plate 17, a flat distribution structure is formed; the pump cylinder 18 is connected to the motor pump shaft 9 through the second flat key 19, and the torque is transmitted by the side of the keyway; the pump cylinder 18 is fixedly connected to the motor pump shaft 9 along the axial direction. The pump cylinder 18 can be used as a separate component, or integrally formed with the motor pump shaft 9. Figure 6 The balanced pump cylinder 18 uses a flat key to replace the traditional involute spline, which has the characteristics of simple structure and high machining processability.

[0045] The second flat key 19 and the nut 20 are used to achieve no relative movement between the pump cylinder 18 and the motor pump shaft 9; the first bearing 11 and the second bearing 12 on the motor pump shaft 9 bear the axial eccentric load and the plunger centrifugal force acting on the pump cylinder 18, so as to achieve force balance of the pump cylinder 18, solve the problem of overturning movement caused by unbalanced force of the pump cylinder 18, solve the problems of eccentric wear of the distribution plate, increased leakage of the distribution pair, and low volumetric efficiency of the pump cylinder 18 under high-speed working conditions, and improve the working speed.

[0046] The screw-fixed return assembly c also includes a retaining ring 21, a sleeve 22, a screw 23, a pressure plate 24, a chuck 25, a washer 26, a swash plate 27, and a first positioning pin 29; the swash plate 27 is installed in the first cavity of the motor pump housing 1, and the second positioning pin 30 is used to prevent the swash plate 27 from rotating relative to the motor pump housing 1; the washer 26 is installed in the swash plate 27, and the first positioning pin 29 is used to prevent the washer 26 from rotating relative to the swash plate 27; the pressure plate 24 is fixedly connected to the swash plate 27 by screws 23, forming a cavity structure composed of the pressure plate 24 and the washer 26.

[0047] The sliding shoe and the chuck 25 of the sliding shoe plunger assembly 28 are placed in the cavity structure. The chuck 25 is installed under the pressure plate 24. The sliding shoe passes through the mounting hole on the chuck 25 and contacts with the pad 26 plane. The matching clearance between the sliding shoe and the pad 26 is adjusted by adjusting the thickness of the pad 26. The pressure plate 24 fixed by the screw 23 limits the sliding shoe and the pad 26 to separate, and constrains the sliding shoe to move in a direction parallel to the pad 26. The retaining ring 21 and the sleeve 22 are used to constrain the swash plate 27 to separate from the first cavity of the motor pump housing 1. Figure 7 The screw-fixed return assembly C is used to replace the traditional plunger pump core spring return mechanism, which avoids the phenomenon of reducing the pump core life due to spring damage and improves working reliability.

[0048] In view of the increasingly stringent requirements of the main engine equipment for the installation space, external dimensions, power density and other indicators of the single machine components, there is a development trend of high-speed design for servo motor pumps - reducing their own displacement and external dimensions through high-speed design, making the entire system more compact and lightweight. High-speed servo motor pumps can be applied to aerospace servo systems with strict requirements on extreme size and weight, and become the power unit of high-power servo systems. In addition, it can also be expanded to the fields of aviation hydraulic systems and intelligent robots with high integration and strict requirements on size and weight.

[0049] The above description is only the best specific implementation mode of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by any technician familiar with the technical field within the technical scope disclosed in the present invention should be covered within the protection scope of the present invention.

[0050] The contents not described in detail in the specification of the present invention belong to the common knowledge of the professionals in this field.

Claims

1. A spherical floating distribution type high speed servo motor pump, characterized in that: It comprises a permanent magnet synchronous motor (Ⅰ), a bidirectional quantitative plunger pump core (Ⅱ) and a motor pump housing (1); The motor pump housing (1) comprises: a first cavity and a second cavity; The permanent magnet synchronous motor (I) comprises: a permanent magnet synchronous motor stator (2), a permanent magnet synchronous motor rotor assembly (3), a rear end cover (4), a first sealing ring (5), an electrical connector end cover (6), a second sealing ring (7), a first flat key (8), a motor pump shaft (9), a rotary transformer (10), a first bearing (11), and a second bearing (12); The permanent magnet synchronous motor stator (2) is placed in the second cavity of the motor pump housing (1) in an interference fit manner, and is prevented from circumferential rotation by a first flat key (8); the bidirectional quantitative plunger pump core (II) is placed in the first cavity of the motor pump housing (1); the bidirectional quantitative plunger pump core (II), the first bearing (11), the permanent magnet synchronous motor rotor assembly (3), the second bearing (12), and the rotary transformer (10) are axially connected in series on the motor pump shaft (9) from left to right; the rear end cover (4) and the motor pump housing (1) are radially sealed by a double-pass first sealing ring (5), and a conveniently detachable electrical connector end cover (6) is provided on the right side of the rear end cover (4) to form a radial seal with the double-pass second sealing ring (7); The bidirectional quantitative plunger pump core (II) comprises: a spherical floating distribution assembly (a), a balanced pump cylinder assembly (b), and a screw-fixed return assembly (c), the three of which are connected in series from left to right; the spherical floating distribution assembly (a) is fixedly connected to the motor pump housing (1); the spherical floating distribution assembly (a) comprises a spherical distribution plate (17), the balanced pump cylinder assembly (b) comprises a pump cylinder (18), a second flat key (19), and the spherical distribution plate (17) is in plane contact with the pump cylinder (18); the screw-fixed return assembly (c) comprises a slanted plate (27), a sliding shoe plunger assembly (28), and a second positioning pin (30), the sliding shoe plunger assembly (28) comprises a plunger and a sliding shoe, the plunger and the sliding shoe are fixedly connected, and the plunger is inserted into the plunger hole in the pump cylinder (18); The spherical floating distribution assembly (a) comprises a spherical end cover (14), a third sealing ring (15), a ball stud (16), and a spherical distribution plate (17); the spherical end cover (14) is fixedly connected to the motor pump housing (1); the first end surface of the spherical distribution plate (17) is a plane structure, which is in plane contact with the pump cylinder (18); the second end surface is a convex spherical structure, which is in spherical contact with the spherical end cover (14); the spherical distribution plate (17) and the spherical end cover (14) are both provided with oil inlet and oil outlet waist grooves, providing oil flow channels; One end of the ball pin (16) is a cylindrical structure and is arranged in the spherical end cover (14) to limit the spherical distribution plate (17) to prevent the spherical distribution plate (17) from rotating relative to the spherical end cover (14); the other end of the ball pin (16) is a spherical structure and is arranged in the spherical distribution plate (17) to realize the rotation of the spherical distribution plate (17); when the pump cylinder (18) rotates due to the bending deformation of the motor pump shaft (9), the spherical distribution plate (17) rotates accordingly; The screw-fixed return assembly (c) also includes a retaining ring (21), a sleeve (22), a screw (23), a pressure plate (24), a chuck (25), a washer (26), a swash plate (27), and a first positioning pin (29); the swash plate (27) is installed in the first cavity of the motor pump housing (1), and the second positioning pin (30) is used to prevent the swash plate (27) from rotating relative to the motor pump housing (1); the washer (26) is installed in the swash plate (27), and the first positioning pin (29) is used to prevent the washer (26) from rotating relative to the swash plate (27); the pressure plate (24) and the swash plate (27) are fixedly connected by the screw (23), forming a cavity structure composed of the pressure plate (24) and the washer (26).

2. A spherical floating flow distribution type high speed servo motor pump according to claim 1, characterized in that: The motor pump shaft (9) drives the balanced pump cylinder assembly (b) to rotate using the second flat key (19); and the second positioning pin (30) is used to prevent the module (c) from rotating relative to the motor pump housing (1).

3. A spherical floating flow distribution type high speed servo motor pump according to claim 1, characterized in that: The spherical end cover (14) is provided with a special-shaped sealing groove, on which a third sealing ring (15) is installed, which is used to achieve oil sealing and provide pre-compression force, so that the spherical distribution plate (17) is automatically pressed against the pump cylinder (18) when the motor pump is not pressurized or not started.

4. A spherical floating flow distribution type high speed servo motor pump according to claim 1, characterized in that: The end surface of the pump cylinder (18) near the spherical distribution plate (17) is a plane structure, and after being closely attached to the spherical distribution plate (17), a plane distribution structure is formed; the pump cylinder (18) is connected to the motor pump shaft (9) through a second flat key (19), and the torque is transmitted by the side of the keyway; the pump cylinder (18) is fixedly connected to the motor pump shaft (9) along the axial direction.

5. The spherical floating flow distribution type high speed servo motor pump according to claim 1, characterized in that: The second flat key (19) and the nut (20) are used to achieve the non-relative movement between the pump cylinder (18) and the motor pump shaft (9); the first bearing (11) and the second bearing (12) on the motor pump shaft (9) bear the axial offset load and the plunger centrifugal force acting on the pump cylinder (18), thereby achieving force balance of the pump cylinder (18) and solving the problem of overturning movement caused by unbalanced force on the pump cylinder (18).

6. The spherical floating flow distribution type high speed servo motor pump according to claim 1, characterized in that: The sliding shoe and the chuck (25) of the sliding shoe plunger assembly (28) are placed in the cavity structure, the chuck (25) is installed below the pressure plate (24), the sliding shoe passes through the installation hole on the chuck (25) and contacts with the pad (26) plane; the pressure plate (24) fixed by the screw (23) limits the sliding shoe and the pad (26) to separate, and constrains the sliding shoe to move in a direction parallel to the pad (26); the retaining ring (21) and the sleeve (22) are used to constrain the inclined plate (27) to separate from the first cavity of the motor pump housing (1).

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