CN205478139U - Two-dimensional duplex axial piston pump - Google Patents

Abstract

The utility model discloses a two-dimensional double axial piston pump, including a housing, a left cylinder, a right cylinder, a left piston and a right piston, the left cylinder and the right cylinder are placed in the housing through positioning steel balls and fixedly connected to the housing through a connecting sleeve, the housing is provided with suction and discharge holes and a leakage oil return channel, the left end of the housing is fixedly installed with a left end cover, the right end of the left cylinder and the left end of the right cylinder are respectively fixedly connected with a left equal plus equal minus curved surface track and a right equal plus equal minus curved surface track having the same rolling surface, and the left equal plus equal minus curved surface track and the right equal plus equal minus curved surface track are arranged 90 degrees apart from each other, that is, the highest point and the lowest point of the left equal plus equal minus curved surface track correspond to the lowest point and the highest point of the right equal plus equal minus curved surface track respectively. The utility model has the advantages of novel and compact structure, small size, light weight, simple transmission, zero torque pulsation, easy speed regulation, high displacement, etc.

Description

Two-dimensional duplex axial piston pump

technical field

The utility model relates to a two-dimensional double-connected axial piston pump, which belongs to hydraulic pumps and hydraulic motors in the field of fluid transmission and control.

Background technique

The double-piston pump uses the piston, the cylinder and the intermediate connector as the main working components, and its structure is symmetrical. When the piston reciprocates in the cylinder, the volume of the closed working volume chamber composed of the piston and the cylinder changes to complete the oil suction and discharge process. According to the different arrangements of the piston in the cylinder, the piston pump is divided into two categories: radial type and axial type. Due to its complex structure and large volume, radial piston pumps have been replaced by axial piston pumps in many occasions. The piston centerline of an axial piston pump is parallel (or substantially parallel) to the axis of the cylinder block. This type of pump has the advantages of good sealing, high working pressure, high volumetric efficiency and total efficiency under high pressure, easy realization of variables and light weight per unit power. Widely used in pressure processing machinery, lifting and transportation equipment, engineering machinery, ship deck machinery, metallurgical machinery, artillery and space technology, and can be used as a high pressure and high pressure oil source.

The working principle of the traditional common axial piston pump: when the transmission shaft drives the cylinder body to rotate, the cylinder body drives the piston to rotate, and by changing the angle between the piston and the inclined plane or the transmission shaft, the piston makes a straight line in the cavity reciprocating motion. Relying on the reciprocating movement of the piston in the cylinder hole, the volume of the sealed working chamber changes to realize oil suction and pressure. The traditional axial piston pump has many relatively moving parts inside, has high requirements on material and machining accuracy, is sensitive to oil pollution, has high requirements and costs for processing, use, and maintenance, and is expensive; the cylinder block is accompanied by the transmission shaft Rotation, the moment of inertia is large, resulting in slow response to start, stop, and speed regulation, which is not conducive to controlling the output flow of the pump through speed regulation; there are many friction pairs in the cylinder, and the cylinder temperature rises faster under high-speed rotation, and the flow distribution The wear of parts such as discs and pistons directly affects the service life and durability of the pump. And because of the limitation of the working principle of the plunger pump itself, each plunger can only realize one oil suction and one oil discharge when the transmission shaft rotates one revolution, and its displacement is limited. Compared with the previously invented single-connected two-dimensional cylindrical guide rail axial piston pump, the utility model not only optimizes the structure, but also doubles the displacement. In addition, the problem of flow pulsation and torque pulsation of the single pump is also solved.

Contents of the invention

In order to overcome the above-mentioned shortcomings of the axial piston pump, the utility model provides a two-dimensional (2D) double pump with the advantages of novel and compact structure, small volume, light weight, simple transmission, zero torque ripple, easy speed regulation, and high displacement. Coupled axial piston pump.

The technical scheme that the utility model adopts is:

The two-dimensional double-connected axial piston pump is characterized in that it includes a housing, a left cylinder, a right cylinder, a left piston and a right piston, the left cylinder and the right cylinder are placed in the housing through positioning steel balls and connected with the connecting sleeve. The casing is fixedly connected, and there are oil suction and discharge holes and leakage oil return channels on the casing. The left end of the casing is fixedly installed with a left end cover. The left equal addition and subtraction curved surface orbit and the right equal addition and subtraction curved surface orbit, and the left equal addition and subtraction curved surface orbit and the right equal addition and subtraction curved surface orbit are staggered by 90 degrees, that is, the left equal addition and subtraction curved surface orbit The highest point and the lowest point correspond to the lowest point and the highest point of the right equal-addition and equal-subtraction surface orbit respectively;

The inside of the left cylinder and the right cylinder are respectively equipped with a left piston and a right piston, and the left piston and the right piston can make linear reciprocating motions along the axial direction of the left cylinder and the right cylinder respectively; The left and right ends of the left piston are respectively equipped with a first plug ring and a second plug ring concentric with the left piston, and a second plug ring concentric with the right piston is respectively installed at the left and right ends of the right piston. The third plug ring and the fourth plug ring;

The space enclosed by the first plug ring, the left piston and the left cylinder constitutes the first left chamber, and the space enclosed by the second plug ring, the left piston and the left cylinder constitutes the first right chamber The volumes of the first left chamber and the first right chamber change alternately with the reciprocating movement of the left piston; when the left piston moves axially from the leftmost end to the rightmost end, the volume of the first left chamber gradually increases, and the first The volume of the right chamber gradually decreases; on the contrary, when the left piston moves axially from the rightmost end to the leftmost end, the volume of the first right chamber gradually increases, and the volume of the first left chamber gradually decreases;

The space enclosed by the third plug ring, the right piston and the right cylinder constitutes the second left chamber, and the space enclosed by the fourth plug ring, the right piston and the right cylinder constitutes the second right chamber The volumes of the second left chamber and the second right chamber alternately change with the reciprocating movement of the left piston; when the right piston moves axially from the leftmost end to the rightmost end, the volume of the second left chamber gradually increases, and the second The volume of the right chamber gradually decreases; on the contrary, when the right piston moves axially from the rightmost end to the leftmost end, the volume of the second right chamber gradually increases, and the volume of the second left chamber gradually decreases;

A shoulder is provided on the left piston and the right piston, and four rectangular grooves are evenly distributed on the surface of the shoulder, and the positions of the notches of the four rectangular grooves are mutually staggered; Two sets of windows corresponding to the four rectangular grooves are evenly distributed on the left cylinder and the right cylinder corresponding to the left piston and the right piston, and the two sets of windows pass through the holes opened on the surface of the left cylinder and the right cylinder. The annular grooves communicate with each other; when working, the rectangular groove communicates with the window, the chamber with gradually larger volume absorbs oil from the fuel tank through the communicating rectangular groove and window, and the chamber with gradually decreasing volume absorbs oil through the communicating groove and window. The oil in the cavity is discharged;

The right end of the left piston and the left end of the right piston are respectively fixedly connected with the intermediate connecting piece through set screws, and a group of large bearing rollers are symmetrically installed on the axial end of the extension shaft of the described intermediate connecting piece, and the extensions of the two intermediate connecting pieces The space angle of the shaft outlet is 45 degrees; the two intermediate connectors are connected by the transmission shaft, and the transmission shaft runs through the left and right pistons, and both ends are fixed; the two intermediate connectors protrude from the bearing big roller on the shaft Correspondingly arranged on the left equal addition and subtraction curved surface track and the right equal addition and subtraction curved surface track respectively, and can roll along the left equal addition and equal subtraction curved surface track or the right equal addition and subtraction curved surface track respectively.

The left end of the transmission shaft is equipped with a mechanical seal moving ring, the right end is equipped with a deep groove ball bearing, and the middle part is equipped with two identical guide rods, and the two guide rods are spaced staggered by 45 degrees, and the ends of the two guide rods are evenly spaced. A group of needle roller bearings is installed, and the two groups of needle roller bearings are respectively embedded in the bearing grooves of the two intermediate connectors.

Both the left equal-addition and subtraction curved track and the right equal-addition and subtractive curved track are cylinders, and the top surface of the cylinder has an inwardly concave curved surface.

A deep groove ball bearing and a static ring of a mechanical seal are installed inside the left end cover.

The first plug ring and the second plug ring are respectively fixed on the left cylinder body through the steel wire retaining ring, and the third plug ring and the fourth plug ring are respectively fixed on the right cylinder body through the first steel wire retaining ring.

The left end cover is fixed on the leftmost end of the housing through the second steel wire retaining ring.

The two-dimensional (2D) double-connected axial piston pump described in the utility model utilizes the motion principle of the piston with two degrees of freedom (rotating and axially moving at the same time) to realize continuous oil suction and discharge. For the structure of the double-connected 2D pump, the two equal-acceleration and equal-deceleration curved surface tracks are respectively fixed on the ends of the two cylinders with positioning pins, placed face to face and the two guide rails are staggered by 90 degrees in space, that is, when the large roller of the bearing is located in one of them When touching the highest point of one rail, it touches the lowest point of the other rail at the same time. The stator of the double-connected 2D pump includes a cylinder body and a constant acceleration and deceleration curved track. The two cylinders are fixed into a whole through a sleeve and inserted into the pump casing. Its rotor includes a piston, an intermediate connecting piece, a large bearing roller, a transmission shaft, and a guide rod. Both pistons are installed in the cylinder body, and the centerlines of the two pistons are parallel. Two shafts are stretched out from the intermediate connector, and a large bearing roller is installed at the ends of the two shafts respectively, and the installation of the two large bearing rollers is symmetrical. The two intermediate connectors are respectively fixedly connected to the ends of the two pistons and placed face to face, and the space where the two intermediate connectors protrude from the shaft is staggered by 45 degrees. The transmission shaft runs through the piston, and its two ends are all fixed by bearings. Two guide rods are installed in the middle of the transmission shaft, which are symmetrical in passing through the transmission shaft, and the ends of the guide rods are respectively equipped with bearings. The first to fourth plug rings, the left piston, the right piston and the housing are installed in the cylinder cavity to form the oil suction and discharge chamber. When the transmission shaft drives the left and right pistons to rotate and reciprocate at the same time, the switching and continuous oil suction and discharge chambers are realized. Suction and discharge of oil.

The beneficial effects of the utility model are mainly reflected in:

1. The integrated design of the shaft and the piston is proposed, which greatly simplifies the overall structure, and uses the dual-degree-of-freedom (2D) structure of the rotation and sliding of the piston to replace the oil distribution plate structure of the traditional axial piston pump to achieve continuous suction and discharge Oil function, and reciprocate once, suck and discharge oil twice, one more time than single-connected axial piston pump;

2. Compared with the multi-friction pair structure of the traditional plunger pump, the utility model has only one pair of friction pairs, which greatly improves the efficiency;

3. Compared with the single-connected 2D piston pump, the utility model eliminates flow pulsation and torque pulsation;

4. Miniaturization is realized, and the cost is greatly reduced under the premise of ensuring the flow rate.

Description of drawings

Fig. 1 is a schematic structural diagram of a 2D double-connected axial piston pump.

Figure 2 is a schematic diagram of the assembly of the guide rod and the transmission shaft.

Figure 3 is a schematic diagram of the assembly of the intermediate connector and the drive shaft.

Figure 4 is a schematic diagram of the transmission part.

Fig. 5a, Fig. 5b and Fig. 5c are schematic diagrams showing the movement of the pistons of the 2D double-piston pump to different positions.

Fig. 5d, Fig. 5e and Fig. 5f are respectively D-D, E-E and F-F cross-sectional views corresponding to Fig. 5a, Fig. 5b and Fig. 5c.

Fig. 6 is a schematic diagram of equal acceleration and equal deceleration guide rails.

Fig. 7 is a schematic diagram of equal acceleration and equal deceleration motion law;

Where a) displacement line b) velocity line c) acceleration line.

detailed description

Referring to Figures 1 to 7, the two-dimensional dual axial piston pump includes a housing 1, a left cylinder 7, a right cylinder 17, a left piston 6 and a right piston 21, and the left cylinder 7 and the right cylinder 17 are positioned The steel ball 8 is placed in the housing 1 and fixedly connected with the housing 1 through the connecting sleeve 23. The housing 1 is provided with an oil suction and discharge hole and a leakage oil return channel. The left end of the housing 1 is fixedly installed with a left end cover 3. The right end of the left cylinder block 7 and the left end of the right cylinder block 17 are respectively fixedly connected with the left equal addition and subtraction curved track 13 and the right equal addition and equal subtraction curved track 15 with the same rolling surface, and the left equal addition and equal subtraction curved track 13 and The right equal addition and subtraction curved surface tracks 15 are mutually staggered by 90 degrees, that is, the highest point and the lowest point of the left equal addition and equal subtraction curved surface track 13 correspond to the lowest point and the highest point of the right equal addition and equal subtraction curved surface track 15 respectively;

The insides of the left cylinder 7 and the right cylinder 17 are respectively equipped with a left piston 6 and a right piston 21, and the left piston 6 and the right piston 21 can be arranged along the inner cavity of the left cylinder 7 and the right cylinder 17 respectively. Reciprocate linearly in the axial direction; the first plug ring 10 and the second plug ring 11 concentric with the left piston are respectively installed at the left and right ends of the left piston 6, and the left and right ends of the right piston 21 A third plug ring 22 and a fourth plug ring 18 concentric with the right piston are respectively installed at the right two ends;

The space enclosed by the first plug ring 10, the left piston 6 and the left cylinder 7 constitutes the first left chamber, and the space enclosed by the second plug ring 11, the left piston 6 and the left cylinder 7 The space constitutes the first right chamber, and the volumes of the first left chamber and the first right chamber change alternately with the reciprocating movement of the left piston; when the left piston moves axially from the leftmost end to the rightmost end, the volume of the first left chamber gradually becomes larger, the volume of the first right chamber gradually decreases; on the contrary, when the left piston moves axially from the rightmost end to the leftmost end, the volume of the first right chamber gradually increases, and the volume of the first left chamber gradually decreases;

The space enclosed by the third plug ring 22, the right piston 21 and the right cylinder body 17 constitutes the second left chamber, and the space enclosed by the fourth plug ring 18, the right piston 21 and the right cylinder body 17 The space constitutes the second right chamber, and the volumes of the second left chamber and the second right chamber change alternately with the reciprocating motion of the left piston; when the right piston moves axially from the leftmost end to the rightmost end, the volume of the second left chamber gradually becomes larger, the volume of the second right chamber gradually decreases; on the contrary, when the right piston moves axially from the rightmost end to the leftmost end, the volume of the second right chamber gradually increases, and the volume of the second left chamber gradually decreases;

Described left piston 6 and right piston 21 are all provided with a shoulder, have four rectangular grooves e, f, g, h evenly distributed on the described shoulder surface, and the groove of four rectangular grooves The port positions are staggered from each other; two groups of windows a, c, b, d corresponding to the four rectangular grooves are evenly distributed on the corresponding positions of the left cylinder body and the right cylinder body and the left piston and the right piston, And the two groups of windows a, c, b, and d communicate with each other through the annular grooves opened on the surface of the left cylinder and the right cylinder; when working, the rectangular groove communicates with the window, and the gradually larger chamber passes through the communicating rectangular groove. Grooves and windows absorb oil from the oil tank, and the chamber with gradually decreasing volume discharges the oil in the cavity through the communicating grooves and windows;

The right end of the left piston 6 and the left end of the right piston 21 are respectively fixedly connected with the intermediate connectors 29, 27 through set screws 28, and a group of bearings are symmetrically installed on the axial ends of the extension shafts of the intermediate connectors 27, 29 Large roller 14, the space angle between the extension shafts of the two intermediate connectors is 45 degrees; the two intermediate connectors are connected by the transmission shaft 4, and the transmission shaft 4 runs through the left and right pistons 6, 21, and the two intermediate connectors The end is fixed; the bearing big rollers 14 on the extension shaft of the two intermediate connectors are respectively arranged on the left equal-addition and subtraction curved surface track 13 and the right equal-addition and equal-subtraction curved surface track 15, and can be added and subtracted along the left and right sides respectively. Subtractive surface orbit or right equal plus equal subtractive surface orbit rolls.

The left end of the transmission shaft 4 is equipped with a moving ring of a mechanical seal 24, the right end is equipped with a deep groove ball bearing 20, and the middle part is equipped with two identical guide rods 26, and the two guide rods 26 are staggered by 45 degrees in space. A group of needle roller bearings 25 are installed at the ends of the guide rods 26, and the two groups of needle roller bearings 25 are embedded in the bearing grooves of the two intermediate connectors 27, 29 respectively.

The left equal addition and subtraction curved track 13 and the right equal addition and subtraction curved track 15 are both cylinders, and the top surface of the cylinder has an inwardly concave curved surface.

A deep groove ball bearing 5 and a static ring of a mechanical seal 24 are installed inside the left end cover 3 .

The first plug ring 10 and the second plug ring 11 are respectively fixed on the left cylinder body through the first steel wire retaining rings 9 and 12, and the third plug ring 22 and the fourth plug ring 18 are respectively passed through the second steel wire Back-up ring 16,19 is fixed on the right cylinder block.

The left end cover is fixed on the leftmost end of the housing 1 through the third wire retaining ring 2 .

The working principle of this embodiment is as follows:

Referring to Figures 1 to 4, the needle bearing 25 is fixedly connected to the guide rod 26, and the guide rod 26 is fixedly connected to the transmission shaft 4. When the external brushless motor is connected to the transmission shaft 4 and rotates, the needle bearing 25, the guide rod 26, transmission shaft 4 rotates together. And the needle bearing 25 is embedded in the bearing groove of the intermediate connecting piece 27 , then the intermediate connecting piece 27 also rotates together with the transmission shaft 4 . Every group (two groups in total) large bearing rollers 14 are fixedly connected with intermediate connectors 27,29 respectively, then two groups of large bearing rollers 14 rotate together with intermediate connectors 27,29. Two groups of large bearing rollers 14 are placed between two equal acceleration and deceleration curved surface tracks 13, 15. When the large bearing rollers rotate, they must reciprocate in the axial direction due to the constraints of the curved surface tracks 13 and 15. sports. And intermediate connector 27,29 is fixedly connected with right piston 21, left piston 6 by set screw 28, and then right piston 21, left piston 6 are reciprocating along with. Then along with the bearing large roller rolling continuously on the left and right equal acceleration and deceleration curved surface tracks, the left piston 6 and the right piston 21 can be made to carry out axial continuous reciprocating motion.

Through the above, it is realized that the left piston 6 and the right piston 21 have continuous reciprocating motion in the axial direction while continuously rotating on the circumference.

Referring to Fig. 1, look at the left half first, the first plug ring 10, the left piston 6 and the left cylinder body 7 constitute the first left chamber of the 2D double axial piston pump; the second plug ring 11, the left piston 6 and the The left cylinder 7 constitutes the first right chamber of the 2D double axial piston pump. As the left piston 6 reciprocates, the volumes of the first left chamber and the first right chamber change regularly. When the left piston 6 is axially transported from the leftmost end to the rightmost end, the volume of the first left chamber gradually increases, and the volume of the first right chamber gradually decreases; When transporting to the direction, the volume of the first right chamber gradually increases, and the volume of the first left chamber gradually decreases. The right half of a duplex pump moves in the same way as the left half.

When the 2D double axial piston pump is working, the groove on the piston communicates with the window on the cylinder body, and the gradually larger volume chamber absorbs oil from the fuel tank through the communicating groove and window; the volume gradually moves so that the left and right chambers The volume of the pump is continuously staggered to achieve continuous oil absorption and oil discharge.

As shown in Figures 5a, 5b, 5c, 5d, 5e, and 5f, they are schematic diagrams of the working principle of a two-dimensional (2D) double piston pump (taking the cylinder in the left half as an example). The left piston rotates counterclockwise (looking from left to right), a, b, c, and d are window passages on the left cylinder block, a, c are oil suction passages, and b, d are oil discharge passages. E, f, g, h are rectangular grooves on the left piston. Figure 5a) shows that when the left piston moves to the leftmost end, the rectangular grooves e, f, g, and h do not communicate with the windows a, b, c, and d at this time. When the left piston rotates, it begins to move to the right end, as shown in Figure 5b), the rectangular grooves e, f, g, h communicate with the windows a, d, b, c respectively. The first left chamber with gradually larger volume absorbs oil from the oil tank through the communication channels e-a and h-c due to self-priming; the first right chamber with gradually smaller volume sucks the oil in the chamber through the communication channels f-d and g-b Liquid squeezed out. As shown in Figure 5c), when the left piston moves to the rightmost end, the rectangular grooves e, f, g, and h on the left piston are no longer in communication with the windows a, b, c, and d. When the left piston continues to rotate, the left piston starts to move to the left, and the first right chamber starts to absorb oil from the oil tank through the communication channels f-a, g-c; the first left chamber squeezes out the oil through the communication channels e-b, h-d. The oil discharged from the two cylinders of the double pump communicates on the shell and is discharged from the same oil outlet.

The content described in the embodiments of this specification is only an enumeration of the implementation forms of the inventive concept, and the protection scope of the present utility model should not be regarded as limited to the specific forms stated in the embodiments, and the protection scope of the present utility model also extends to this invention. Equivalent technical means that those skilled in the art can think of according to the concept of the utility model.

Claims (6)

1. Two-dimensional double-connected axial piston pump, characterized in that: it includes a housing, a left cylinder, a right cylinder, a left piston and a right piston, the left cylinder and the right cylinder are placed in the housing through positioning steel balls and connected by The sleeve is fixedly connected with the casing, and the casing is provided with an oil suction and discharge hole and a leakage oil return channel. The left equal addition and subtraction surface orbit and the right equal addition and subtraction surface orbit of the same rolling surface, and the left equal addition and subtraction surface orbit and the right equal addition and subtraction surface orbit are staggered by 90 degrees, that is, the left equal addition and subtraction surface The highest point and the lowest point of the orbit correspond to the lowest point and the highest point of the right equal-addition and equal-subtraction surface orbit respectively; The inside of the left cylinder and the right cylinder are respectively equipped with a left piston and a right piston, and the left piston and the right piston can make linear reciprocating motions along the axial direction of the left cylinder and the right cylinder respectively; The left and right ends of the left piston are respectively equipped with a first plug ring and a second plug ring concentric with the left piston, and a second plug ring concentric with the right piston is respectively installed at the left and right ends of the right piston. The third plug ring and the fourth plug ring; The space enclosed by the first plug ring, the left piston and the left cylinder constitutes the first left chamber, and the space enclosed by the second plug ring, the left piston and the left cylinder constitutes the first right chamber The volumes of the first left chamber and the first right chamber change alternately with the reciprocating movement of the left piston; when the left piston moves axially from the leftmost end to the rightmost end, the volume of the first left chamber gradually increases, and the first The volume of the right chamber gradually decreases; on the contrary, when the left piston moves axially from the rightmost end to the leftmost end, the volume of the first right chamber gradually increases, and the volume of the first left chamber gradually decreases; The space enclosed by the third plug ring, the right piston and the right cylinder constitutes the second left chamber, and the space enclosed by the fourth plug ring, the right piston and the right cylinder constitutes the second right chamber The volumes of the second left chamber and the second right chamber alternately change with the reciprocating movement of the left piston; when the right piston moves axially from the leftmost end to the rightmost end, the volume of the second left chamber gradually increases, and the second The volume of the right chamber gradually decreases; on the contrary, when the right piston moves axially from the rightmost end to the leftmost end, the volume of the second right chamber gradually increases, and the volume of the second left chamber gradually decreases; A shoulder is provided on the left piston and the right piston, and four rectangular grooves are evenly distributed on the surface of the shoulder, and the positions of the notches of the four rectangular grooves are mutually staggered; Two sets of windows corresponding to the four rectangular grooves are evenly distributed on the left cylinder and the right cylinder corresponding to the left piston and the right piston, and the two sets of windows pass through the holes opened on the surface of the left cylinder and the right cylinder. The annular grooves communicate with each other; when working, the rectangular groove communicates with the window, the chamber with gradually larger volume absorbs oil from the fuel tank through the communicating rectangular groove and window, and the chamber with gradually decreasing volume absorbs oil through the communicating groove and window. The oil in the cavity is discharged; The right end of the left piston and the left end of the right piston are respectively fixedly connected with the intermediate connecting piece through set screws, and a group of large bearing rollers are symmetrically installed on the axial end of the extension shaft of the described intermediate connecting piece, and the extensions of the two intermediate connecting pieces The space angle of the shaft outlet is 45 degrees; the two intermediate connectors are connected by the transmission shaft, and the transmission shaft runs through the left and right pistons, and both ends are fixed; the two intermediate connectors protrude from the bearing big roller on the shaft Correspondingly arranged on the left equal addition and subtraction curved surface track and the right equal addition and subtraction curved surface track respectively, and can roll along the left equal addition and equal subtraction curved surface track or the right equal addition and subtraction curved surface track respectively. 2. The two-dimensional duplex axial piston pump according to claim 1, characterized in that: the left end of the transmission shaft is equipped with a mechanical seal moving ring, the right end is equipped with a deep groove ball bearing, and the middle part is installed with two The guide rods are the same, and the space between the two guide rods is staggered by 45 degrees. A set of needle roller bearings are installed at the ends of the two guide rods, and the two sets of needle roller bearings are respectively embedded in the bearing grooves of the two intermediate connectors. 3. The two-dimensional duplex axial piston pump according to claim 2, characterized in that: the left equal-addition and subtraction curved track and the right equal-plus and equal-subtraction curved track are cylinders, and the cylinders The top surface has an inwardly concave arc-shaped surface. 4. The two-dimensional duplex axial piston pump according to claim 3, characterized in that: deep groove ball bearings and static rings of mechanical seals are installed inside the left end cover. 5. The two-dimensional dual axial piston pump according to claim 4, characterized in that: the first plug ring and the second plug ring are respectively fixed on the left cylinder body through the first steel wire retaining ring, and the The third plug ring and the fourth plug ring are respectively fixed on the right cylinder body through the second wire retaining ring. 6 . The two-dimensional dual axial piston pump according to claim 5 , wherein the left end cover is fixed on the leftmost end of the housing through a third steel retaining ring. 7 .