Integrated motor pump rotary joint

Abstract

The present invention provides an integrated motor pump rotary joint, which fully combines the advantages of hydraulic transmission and incorporates the structural characteristics of a robot joint. It adopts the principles of integration, standardization, and modularization, facilitating integrated installation and use. It includes: an outer rotor torque motor, which includes an outer ring rotor, an inner ring stator, a stator fixed end cover, and a stator central through hole; a radial piston pump, which includes a pump body and a number of radially distributed radial pistons; a check valve; a pressurizing oil tank, which includes a pressurizing oil tank piston, a pressurizing oil tank sealing end cover, and an elastic element; a first rotating housing; a second rotating housing; a first bearing; and a flow distribution shaft, the flow distribution shaft includes a front convex flow distribution part and a rear end positioning part; the first rotating housing and the second rotating housing form an independent rotating housing mechanism through the first bearing combination; the first rotating housing and the second rotating housing form a central through cavity with a central hollow; the outer rotor torque motor is arranged in the central through cavity.

Description

Technical Field

[0001] The present invention relates to the technical field of robot structures, specifically an integrated motor-pump rotary joint. Background Art

[0002] With the increasing degree of mechanization, automation, and intelligence in all walks of life, in order to expand the application fields of mechanical automation to a greater extent, especially in the field of robots: quadruped robots, biped robots, exoskeletons, robotic arms, etc. Therefore, the robot field has put forward higher and stricter performance requirements for rotary joints. Currently, the rotary joints of various robots mainly adopt the structure of a servo motor plus a speed reducer. Although it has been widely used, it has the defects of relatively low power density ratio and low response speed. To solve such problems, various rotary joints composed of integrated electro-hydraulic actuators (EHAs) and hydraulic actuators driven by a hydraulic pump station through pipelines have emerged, but they all have the problems of large size, complex structure, and inability to fully integrate the structural characteristics of robots, so they cannot be fully applied to the robot field. The electro-hydraulic servo control system has the advantages of large power density, high control accuracy, fast response speed, etc., and is convenient for miniaturization, integration, standardization, and modular design. Therefore, it has an irreplaceable trend and occasion in the robot application field. Therefore, the robot field urgently needs a batch of customized hydraulic components. Summary of the Invention

[0003] In view of the above problems, the present invention provides an integrated motor-pump rotary joint, which fully combines the advantages of hydraulic transmission and integrates the structural characteristics of robot joints. It has a novel structural principle, a simple spatial structure, and adopts the design principles of integration, standardization, and modularization, which is convenient for integrated installation and use.

[0004] The integrated motor-pump rotary joint is characterized in that it includes:

[0005] An outer-rotor torque motor, which includes an outer-ring rotor, an inner-ring stator, a stator fixed end cover, and a stator central through hole;

[0006] A radial piston pump, which includes a pump body and a plurality of radially arranged pistons, and the radial pistons are installed in the piston holes evenly arranged on the outer cylindrical surface of the pump body;

[0007] A one-way valve;

[0008] A pressurized oil tank, which includes a pressurized oil tank piston, a pressurized oil tank sealing end cover, and an elastic element;

[0009] A first rotating housing;

[0010] A second rotating housing;

[0011] A first bearing;

[0012] and a flow distribution shaft, the flow distribution shaft including a front convex flow distribution part and a rear end positioning part;

[0013] The first rotating housing and the second rotating housing form an independently rotating housing mechanism through a first bearing assembly. The first rotating housing is assembled corresponding to the inner ring of the first bearing, and the second rotating housing is assembled corresponding to the outer ring of the first bearing. Corresponding connection interfaces are respectively arranged on the opposite end faces of the first rotating housing and the second rotating housing;

[0014] The first rotating housing and the second rotating housing are combined to form a central through cavity with a hollow center;

[0015] An outer rotor torque motor is inserted into the central through cavity. The fixed end cover of the stator of the outer rotor torque motor is arranged towards the outside of the central through cavity. The outer ring rotor is arranged in the central through cavity. The inner end face of the outer ring rotor is fixedly connected with the pump body. A plurality of radial plungers are also arranged on the pump body. The front convex flow distribution part of the flow distribution shaft is inserted into the central hole of the pump body. The rear end positioning part protrudes rearward from the central hole of the pump body, and the rear end positioning part is fixedly connected with the second rotating housing;

[0016] An oil passage communicating with the oil cavity corresponding to the flow distribution groove is arranged in the flow distribution shaft. The oil passage also includes an adjustment oil passage communicating with the outside gap passage. A one-way valve is arranged on the adjustment oil passage, and the one-way valve can only pass radially from the outside to the inside;

[0017] The central through hole of the stator is hermetically connected with a pressurized oil tank sealing end cover. The pressurized oil tank piston penetrates through the pressurized oil tank sealing end cover and the large-diameter end is located axially inside the central through hole of the stator. The large-diameter end of the pressurized oil tank piston is in circumferential sealing contact connection with the central through hole of the stator;

[0018] The cavity between the inner end face of the large-diameter end of the pressurized oil tank piston and the front end face of the front convex flow distribution part is a pressurized oil cavity. The pressurized oil cavity is specifically a sealed cavity formed among the outer rotor torque motor, the integrated housing, the integrated housing end cover, the flow distribution shaft and the pressurized oil tank piston. Each part of the pressurized oil cavity is communicated through the outside gap passage;

[0019] An elastic element is arranged in the space between the opposite end faces of the pressurized oil tank sealing end cover and the large-diameter end of the pressurized oil tank piston, and the elastic element applies elastic pressure to the pressurized oil tank piston;

[0020] Two oil ports are also opened on the rear end positioning part. The two oil ports are respectively communicated with the oil passage, and the two oil ports include an oil inlet and an oil outlet.

[0021] Its further feature lies in that:

[0022] The first rotating housing is specifically an outer ring housing, which includes a fixed end cover and a covering ring structure. The fixed end cover is arranged at the rear end of the covering ring structure, and a plurality of first positioning holes are annularly distributed on the fixed end cover.

[0023] The second rotating housing is specifically an integrated housing, which includes an outer ring housing and an inner ring end cover. A flow distribution shaft mounting hole is preset at the radial center of the inner ring end cover. The inner ring end cover is fixedly connected to the inner ring wall of the outer ring housing. The outer ring housing includes a support ring and a radially outer end connection flange.

[0024] The left boss of the pump body is in clearance fit with the end face center inner hole of the outer ring rotor, which is used to position and ensure the concentricity of the two.

[0025] The elastic element is specifically a wave spring.

[0026] The rear end positioning part protrudes rearward from the central hole of the pump body. The rear end positioning part is inserted into the flow distribution shaft mounting hole of the inner ring end cover. A plurality of second positioning holes are annularly distributed on the rear outer ring surface of the outer ring housing. A support ring is arranged at the front part of the outer ring housing. The outer ring wall of the support ring is closely attached to the inner ring of the first bearing. The outer ring of the first bearing is closely attached to the inner wall of the covering ring structure of the outer ring housing.

[0027] The rear end positioning part is fixedly connected to the inner ring positioning hole of the integrated housing. A plurality of second positioning holes are annularly distributed on the rear outer ring surface of the integrated housing. A support ring is arranged at the front part of the integrated housing. The outer ring wall of the support ring is closely attached to the inner ring of the first bearing. The outer ring of the first bearing is closely attached to the inner wall of the covering ring structure of the outer ring housing.

[0028] Both the outer ring housing and the integrated housing are arranged with the rotating shaft of the outer rotor torque motor as the central axis. The outer ring housing and the integrated housing rotate independently under the action of an external force.

[0029] The first positioning holes and the second positioning holes are respectively the corresponding installation, fixing and connecting interfaces of the integrated motor pump rotating joint.

[0030] The first bearing is specifically a pair of back-to-back angular contact ball bearings. Dust-proof rings are respectively arranged at both axial ends of the first bearing. The two groups of dust-proof rings prevent pollutants from entering the working chamber of the first bearing.

[0031] Needle bearings are annularly distributed between the outer ring surface of the outer ring rotor and the inner ring wall of the support ring, which ensures the reliable and stable alignment degree of the assembly of the whole structure.

[0032] A locking nut is fixedly arranged at one end of the support ring close to the fixed end cover. The locking nut is used to press the first bearing to ensure the stable and reliable installation position of the first bearing.

[0033] The outer circumferential thread of the stator fixed end cover is threadedly connected to the internal thread at the corresponding position of the support ring, ensuring that the entire structure can be assembled quickly and conveniently;

[0034] An eccentric inner hole is formed on the inner ring wall of the support ring. The outer ring of the second bearing is in interference fit with the cylindrical surface of the eccentric inner hole on the right side of the integrated housing. The inner ring of the second bearing contacts the outer end of the radial plunger. The radial plungers are respectively mounted on the inner ring of the second bearing in the extended state, and the outer end of the radial plunger is a spherical structure, ensuring small wear and long service life.

[0035] After adopting the structure of the present invention, the integrated motor pump is arranged in the central through cavity with a central hollow formed by the combination of the first rotating housing and the second rotating housing during the rotation shutdown of the robot. This enables the elimination of the need for additional space for the layout of the integrated motor pump during robot manufacturing. It fully combines the advantages of hydraulic transmission and integrates the structural characteristics of the robot joint, featuring a novel structural principle, a simple spatial structure, and adopting the design principles of integration, standardization, and modularization, facilitating integrated installation and use. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 is a schematic cross-sectional view of the present invention;

[0037] Figure 2 is a cross-sectional view showing the working principle of the radial piston pump of the present invention;

[0038] Figure 3 is a left view of the present invention;

[0039] Figure 4 is a right view of the present invention;

[0040] Figure 5 is a schematic perspective view of the outer rotor torque motor applicable to the present invention;

[0041] Figure 6 is Figure 1 a partial enlarged view of part A of DETAILED DESCRIPTION OF THE EMBODIMENTS

[0042] The integrated motor pump rotary joint, as shown in Figures 1-6 , includes:

[0043] An outer rotor torque motor 10, which includes an outer ring rotor 11, an inner ring stator 12, a stator fixed end cover 13, and a stator central through hole 14;

[0044] A radial piston pump 20, which includes a pump body 21 and a plurality of radially arranged radial pistons 22;

[0045] A check valve 30;

[0046] A pressurizing oil tank 40, which includes a pressurizing oil tank piston 41 and a pressurizing oil tank sealing end cover 42;

[0047] A first rotating housing 50;

[0048] A second rotating housing 60;

[0049] A first bearing 70;

[0050] And a flow distribution shaft 80, the flow distribution shaft 80 includes a front convex flow distribution part 81 and a rear end positioning part 82;

[0051] The first rotating housing 50 and the second rotating housing 60 are combined through the first bearing 70 to form a housing mechanism that rotates independently of each other. The first rotating housing 50 is assembled corresponding to the inner ring of the first bearing 70, and the second rotating housing 60 is assembled corresponding to the outer ring of the first bearing 70; corresponding connection interfaces are respectively arranged on the opposite end faces of the first rotating housing 50 and the second rotating housing 60;

[0052] The first rotating housing 50 and the second rotating housing 60 are combined to form a central through cavity 100 with a central hollow;

[0053] An outer rotor torque motor 10 is arranged in the central through cavity 100. The stator fixed end cover 13 of the outer rotor torque motor 10 is arranged towards the outside of the central through cavity 100. The outer ring rotor 11 is arranged in the central through cavity 100. A pump body 21 is fixedly connected to the inner end face of the outer ring rotor 11. A number of radial plungers 22 are also arranged on the pump body 21. The front convex flow distribution part 81 of the flow distribution shaft 80 is inserted into the central hole of the pump body 21. The rear end positioning part 82 protrudes rearward from the central hole of the pump body 21, and the rear end positioning part 82 is fixedly connected to the second rotating housing 60;

[0054] An oil passage 83 corresponding to the communicating flow distribution groove 87 is arranged in the flow distribution shaft 80. The oil passage 83 also includes an adjusting oil passage 84 communicating with the outer side gap passage 85. A one-way valve 30 is arranged on the adjusting oil passage 84, and the one-way valve 30 can only radially pass from the outside to the inside;

[0055] The central through hole 14 of the stator is threadedly connected with the pressurizing oil tank sealing end cover 42. The pressurizing oil tank piston 41 penetrates through the pressurizing oil tank sealing end cover 42, and the large diameter end 411 is located axially inside the central through hole 14 of the stator. The large diameter end 411 of the pressurizing oil tank piston 41 is circumferentially sealed and connected to the central through hole 14 of the stator;

[0056] The cavity between the inner end face of the large diameter end 411 of the pressurizing oil tank piston 41 and the front end face of the front convex flow distribution part 81 is a pressurizing oil cavity 86. The pressurizing oil cavity is specifically a closed cavity formed among the outer rotor torque motor, the integrated housing, the integrated housing end cover, the flow distribution shaft and the pressurizing oil tank piston. Each part of the pressurizing oil cavity 86 is communicated through the outer side gap passage 85;

[0057] An elastic element 110 is arranged in the space between the opposite end faces of the sealed end cover 42 of the pressurizing oil tank and the large-diameter end 411 of the pressurizing oil tank piston 41, and the elastic element 110 applies elastic pressure to the pressurizing oil tank piston 41;

[0058] The rear end positioning part 82 is also provided with two oil ports, and the two oil ports are respectively communicated with the oil circuit, and the two oil ports include an oil inlet and an oil outlet.

[0059] During specific implementation: the oil outlet and the oil inlet are respectively connected with a joint body 120, and the two joint bodies 120 are respectively connected with an external oil cylinder 130 through pipelines.

[0060] The first rotating housing 50 is specifically an outer ring housing, which includes a fixed end cover 51 and a covering ring structure 52. The fixed end cover 51 is arranged at the rear end of the covering ring structure 52, and the first positioning holes 511 are distributed in a ring on the fixed end cover 51;

[0061] The second rotating housing 60 is specifically an integrated housing, which includes an outer ring housing 61 and an inner ring end cover 62. A flow distribution shaft mounting hole is preset at the radial center of the inner ring end cover 62, and the inner ring end cover 62 is fixedly connected to the inner ring wall of the outer ring housing 61. The outer ring housing 61 includes a support ring 63 and a radially outer end connection flange 64; during specific implementation, the outer ring of the inner ring end cover 62 is threadedly connected to the reserved central mounting cavity of the outer ring housing 61;

[0062] The left convex platform of the pump body 21 is in clearance fit with the inner hole at the center of the end face of the outer ring rotor 11, which is used to position and ensure the concentricity of the two;

[0063] The elastic element 110 is specifically a corrugated spring;

[0064] The rear end positioning part 82 protrudes backward from the central hole of the pump body 21, and the rear end positioning part 82 is inserted into the flow distribution shaft mounting hole of the inner ring end cover 62. The second positioning holes 611 are distributed in a ring on the rear outer ring surface of the outer ring housing 61. A support ring 63 is arranged at the front part of the outer ring housing 61, and the outer ring wall of the support ring 63 is closely attached to the inner ring of the first bearing 70, and the outer ring of the first bearing 70 is closely attached to the inner wall of the covering ring structure 52 of the outer ring housing;

[0065] Both the outer ring housing and the integrated housing are arranged with the rotating shaft of the outer rotor torque motor 10 as the central axis, and the outer ring housing and the integrated housing rotate independently under the action of an external force;

[0066] The first positioning holes 511 and the second positioning holes 611 are respectively the corresponding installation, fixing and connecting interfaces of the integrated motor pump rotating joint;

[0067] The first bearing 70 is specifically a pair of back-to-back angular contact ball bearings. Dust-proof rings 170 are respectively arranged at the axial two ends of the first bearing 70. The two groups of dust-proof rings 170 prevent pollutants from entering the working chamber of the first bearing 70;

[0068] Needle bearings 140 are annularly arranged between the outer ring surface of the outer ring rotor 11 and the inner ring wall of the support ring 63, which ensures reliable and stable alignment of the assembly of the entire structure;

[0069] A locking nut 150 is fixedly installed at one end of the support ring 63 close to the fixed end cover 51. The locking nut 150 is used to compress the first bearing 70 to ensure the stable and reliable installation position of the first bearing 70;

[0070] The outer circumferential thread of the stator fixed end cover 13 is threadedly connected to the internal thread at the corresponding position of the support ring 63, ensuring quick and convenient assembly of the entire structure;

[0071] A second bearing 160 is fixedly installed at the outer circumferential position of the inner ring wall of the support ring 63 corresponding to the outer end of the radial plunger 22. The radial plungers 22 are respectively abutted against the inner ring of the second bearing 160 in the extended state, and the outer end of the radial plunger 22 is a spherical structure, ensuring small wear and long service life. In specific implementation, a plurality of radial plungers are annularly arranged on the pump body. The oil cavities of each radial plunger are respectively communicated with the distribution grooves 87 of the distribution shaft 80 at different positions. The distribution grooves 87 are respectively connected to the joint body 120 through corresponding oil paths 83. In specific implementation, the second bearing 160 is specifically a deep groove ball bearing. An eccentric inner hole is formed on the inner ring wall of the support ring 63. The outer ring of the second bearing 160 is in interference fit with the cylindrical surface of the eccentric inner hole on the right side of the integrated housing. The inner ring of the second bearing 60 is in contact with the outer end of the radial plunger 22. The radial plungers 22 are respectively abutted against the inner ring of the second bearing 60 in the extended state, and the outer end of the radial plunger 22 is a spherical structure, ensuring small wear and long service life. The setting of the eccentric structure ensures subsequent normal operation.

[0072] In specific implementation, three inner holes are provided on the end face of the stator fixed end cover 13 and are in interference connection with the outer cylindrical surface of the insulating column in the welded sealing terminal 90. The outer cylindrical surfaces of the conductive columns in the welded sealing terminal 90 are respectively in clearance fit with the central stepped holes of the insulating columns. Sealing ring grooves are provided on the outer cylindrical surface of the insulating column and the outer cylindrical surface of the conductive column for installing sealing rings to seal the oil. The inner side of the welded sealing terminal is connected to the electrical components of the outer rotor torque motor 10. The outside of the welded sealing terminal 90 serves as the electrical interface of the integrated motor pump rotating joint.

[0073] In specific implementation, the fixed end cover 51 is fixedly connected to cover the corresponding connection end face of the covering ring body structure 52 through annular bolts, and the distribution shaft 80 is fixedly connected to the inner ring end cover 62 through annular screws, making the entire structure stable and reliable after assembly.

[0074] Its working principle is as follows: An additional oil inlet pipeline is provided for the pressurizing oil chamber 86 for oil injection, or after the oil pressure in the pressurizing oil chamber 86 is insufficient each time, the sealing end cover 42 of the pressurizing oil tank and the piston 41 of the pressurizing oil tank are opened to inject pressure oil into the pressurizing oil chamber 86. The pressurizing oil chamber 86 maintains a stable state under the action of the wave spring until the oil inlet of the oil circuit in the radial piston pump body 20 cannot meet the demand of the oil discharge circuit. Then the wave spring pushes the hydraulic oil in the pressurizing oil chamber 86 to enter the oil circuit of the distribution shaft 80 along the outer gap passage through the one-way valve, so that the entire hydraulic system works normally and stably until the oil in the pressurizing oil chamber 86 is exhausted.

[0075] When the outer rotor torque motor 10 drives the radial piston pump 20 to rotate, under the combined action of centrifugal force and eccentricity, the radial piston 22 makes a reciprocating motion in the circumferential hole of its corresponding radial piston pump cylinder block. When the radial piston 22 extends radially outwards, the hydraulic oil reaches the corresponding distribution groove 87 (in the normal working state) from the corresponding joint body 120 of the oil return pipeline through the oil circuit 83 in the distribution shaft 80, or the hydraulic oil in the pressurizing oil chamber 86 is supplemented to the corresponding distribution groove 87 through the oil circuit 83 in the distribution shaft 80 by opening the one-way valve 30 through the outer gap oil circuit 85 (when the oil inlet volume is lower than the oil discharge volume and the pressurizing oil chamber 86 supplements hydraulic oil into the oil circuit). The circumferential hole of the cylinder block 21 of its corresponding radial piston pump is communicated with the distribution groove 87 and is in the oil suction state.

[0076] When the radial piston 21 retracts inwards, the circumferential hole of its corresponding radial piston cylinder block is communicated with the corresponding distribution groove in the distribution shaft 80 and is in the oil discharge state. The hydraulic oil reaches the joint body 120 of the oil discharge pipeline and the reverse cut-off port of the one-way valve 30 from the distribution groove 87 through the oil circuit in the distribution shaft 80, and the one-way valve 30 prevents the hydraulic oil from entering the pressurizing oil chamber 86.

[0077] When the rotation direction of the outer rotor torque motor 10 changes, the oil suction and discharge processes of the set corresponding number of radial pistons are interchanged, so that the oil suction and discharge of the distribution groove 87 in the distribution shaft 80 and the oil suction and discharge of the corresponding joint body 120 are interchanged, thus realizing the commutation of the motor pump in the pump-controlled hydraulic system; when only one installation and fixing interface is fixed, the other installation and fixing interface will rotate around the central axis under the action of external force, so as to achieve the function of a rotating joint.

[0078] It sets the integrated motor pump in the central through cavity with a central hollow formed by the combination of the first rotating shell and the second rotating shell of the robot rotating joint. When manufacturing the robot, there is no need to set an additional space for arranging the integrated motor pump. It fully combines the advantages of hydraulic transmission and integrates the structural characteristics of the robot joint, with a novel structural principle, a simple spatial structure, and adopts the design principles of integration, standardization and modularization, which is convenient for integrated installation and use.

[0079] The use of an outer rotor torque motor for driving can obtain greater torque, which is beneficial for starting with a load; the use of a radial piston pump can not only simplify the structure and facilitate the design of flatness, high speed and high pressure, but also is beneficial to improving the power density ratio of the motor pump; the radial piston pump is also convenient for the design of a two-way pump, and the motor pump can be directly used for commutation in a pump-controlled hydraulic system, which is beneficial to simplifying the pump-controlled hydraulic system; the design of the sliding friction pair of the radial piston pump is reduced, which is beneficial to improving the service life of the radial piston pump, thereby improving the service life of the motor pump, enabling hydraulic transmission to have a wider application in the field of robotics, expanding the application scenarios of hydraulic transmission robots, and having great application value.

[0080] For those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and the present invention can be implemented in other specific forms without departing from the spirit or basic characteristics of the present invention. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be encompassed within the present invention. Any reference signs in the claims should not be regarded as limiting the claimed claim.

[0081] In addition, it should be understood that although this specification is described according to embodiments, not every embodiment only contains an independent technical solution. This narrative way of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. Integrated motor pump rotary joint, characterized in that, It includes: An outer rotor torque motor, which includes an outer ring rotor, an inner ring stator, a stator fixed end cover, and a stator central through hole; A radial piston pump, which includes a pump body and a number of radially distributed pistons, and the radial pistons are installed in piston holes evenly arranged on the outer cylindrical surface circumference of the pump body; A check valve; A pressurizing oil tank, which includes a pressurizing oil tank piston, a pressurizing oil tank sealing end cover, and an elastic element; A first rotating housing; A second rotating housing; A first bearing; And a distribution shaft, the distribution shaft includes a front protruding distribution part and a rear end positioning part; The first rotating housing and the second rotating housing form an independently rotating housing mechanism through the first bearing. The first rotating housing is assembled corresponding to the inner ring of the first bearing, and the second rotating housing is assembled corresponding to the outer ring of the first bearing; corresponding connection interfaces are respectively arranged on the opposite end faces of the first rotating housing and the second rotating housing; The first rotating housing and the second rotating housing form a central hollow central through cavity; The outer rotor torque motor is arranged in the central through cavity. The stator fixed end cover of the outer rotor torque motor is arranged towards the outside of the central through cavity. The outer ring rotor is arranged in the central through cavity. The pump body is fixedly connected to the inner end face of the outer ring rotor. A number of radial pistons are also arranged on the pump body. The front protruding distribution part of the distribution shaft is inserted into the central hole of the pump body, and the rear end positioning part protrudes rearward from the central hole of the pump body, and the rear end positioning part is fixedly connected to the second rotating housing; An oil path corresponding to the communication distribution groove is arranged in the distribution shaft, and the oil path also includes an adjustment oil path communicating with an outer gap path. The check valve is arranged on the adjustment oil path, and the check valve can only radially conduct from the outside to the inside; The pressurizing oil tank sealing end cover is inserted into the stator central through hole. The pressurizing oil tank piston penetrates through the pressurizing oil tank sealing end cover and the large diameter end is located on the axial inner side of the stator central through hole. The large diameter end of the pressurizing oil tank piston is hermetically connected to the circumference of the stator central through hole; The cavity between the inner end face of the large diameter end of the pressurizing oil tank piston and the front end face of the front protruding distribution part is a pressurizing oil cavity. Specifically, the pressurizing oil cavity is a sealed cavity formed among the outer rotor torque motor, the integrated housing, the integrated housing end cover, the distribution shaft and the pressurizing oil tank piston, and each part of the pressurizing oil cavity is communicated through an outer gap path; An elastic element is arranged in the space between the opposite end faces of the pressurizing oil tank sealing end cover and the large diameter end of the pressurizing oil tank piston, and the elastic element applies elastic pressure to the pressurizing oil tank piston; Two oil ports are also opened on the rear end positioning part, and the two oil ports are respectively communicated with the oil path. The two oil ports include an oil inlet and an oil outlet.

2. The integrated motor pump rotary joint according to claim 1, wherein: The first rotating housing is specifically an outer ring housing, which includes a fixed end cover and a covering ring body structure. The fixed end cover is arranged at the rear end of the covering ring body structure, and a number of first positioning holes are arranged on the fixed end cover.

3. The integrated motor pump rotary joint according to claim 2, wherein: The second rotating housing is specifically an integrated housing, which includes an outer ring housing and an inner ring end cover. A flow distribution shaft mounting hole is preset at the radial center of the inner ring end cover. The inner ring end cover is fixedly connected to the inner ring wall of the outer ring housing. The outer ring housing includes a support ring and a radially outer end connection flange.

4. The integrated motor pump rotary joint according to claim 1, wherein: The elastic element is specifically a wave spring.

5. The integrated motor pump rotary joint according to claim 3, wherein: The rear end positioning part protrudes rearward from the central hole of the pump body. The rear end positioning part is inserted into the flow distribution shaft mounting hole of the inner ring end cover. Second positioning holes are circumferentially distributed on the rear outer ring surface of the outer ring housing. A support ring is arranged at the front part of the outer ring housing. The outer ring wall of the support ring is closely attached to the inner ring of the first bearing. The outer ring of the first bearing is closely attached to the inner wall of the covering ring structure of the outer ring housing.

6. The integrated motor pump rotary joint according to claim 5, characterized in that: The rear end positioning part is fixedly connected to the inner ring positioning hole of the integrated housing. Second positioning holes are circumferentially distributed on the rear outer ring surface of the integrated housing. A support ring is arranged at the front part of the integrated housing. The outer ring wall of the support ring is closely attached to the inner ring of the first bearing. The outer ring of the first bearing is closely attached to the inner wall of the covering ring structure of the outer ring housing.

7. The integrated motor pump rotary joint according to claim 3, characterized in that: Both the outer ring housing and the integrated housing are arranged with the rotating shaft of the outer rotor torque motor as the central axis. The outer ring housing and the integrated housing rotate independently under the action of an external force.

8. The integrated motor pump rotary joint according to claim 1, wherein: The first bearing is specifically a pair of back-to-back angular contact ball bearings. Dust-proof rings are respectively arranged at both axial ends of the first bearing. The two groups of dust-proof rings prevent pollutants from entering the working chamber of the first bearing.

9. The integrated motor pump rotary joint according to claim 6, wherein: Needle bearings are circumferentially distributed between the outer ring surface of the outer ring rotor and the inner ring wall of the support ring.

10. The integrated motor pump rotary joint according to claim 9, wherein: A second bearing is fixedly installed at the outer circumferential position of the inner ring wall of the support ring corresponding to the outer end of the radial plunger. The radial plungers are respectively abutted against the inner ring of the second bearing in the extended state, and the outer ends of the radial plungers are spherical structures.

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