CN206562977U - Two-dimensional axial plunger pump - Google Patents

Abstract

A two-dimensional axial piston pump includes a first cylinder for oil inlet and outlet, a second cylinder for adjusting oil suction and discharge, a plunger assembly, a drive assembly for realizing the two-degree-of-freedom movement of the plunger assembly, and a An end cover for accommodating the plunger assembly, the first cylinder is sealed and affixed to the first end of the second cylinder, and the second end of the second cylinder is sealed and affixed to the end cover; The plunger assembly is accommodated in the plunger chamber of the end cap, and the plunger assembly is rotatably connected with the second cylinder. The beneficial effect of the utility model is: the integrated design of the shaft and the plunger greatly simplifies the overall structure, and the oil distribution plate of the traditional axial plunger pump is replaced by the double motion freedom (2D) structure of the rotation and sliding of the plunger structure, to realize the function of continuous oil suction and discharge, and reciprocate once, oil suction and discharge each time, one more time than the traditional axial piston pump; the utility model has only one pair of friction pairs, so that the efficiency is greatly improved; the cost is greatly reduced.

Description

Two-dimensional axial piston pump

technical field

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

Background technique

The plunger pump uses the plunger and the cylinder block as the main working components. When the plunger reciprocates in the plunger hole of the cylinder body, the volume of the closed working volume chamber composed of the plunger and the cylinder body changes, and the process of oil suction and discharge is completed. According to the different arrangements of the plunger in the cylinder, the plunger 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 Due to its complex structure and large volume, radial piston pumps have been replaced by axial piston pumps in many occasions.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 plunger centerline of an axial piston pump is parallel (or substantially parallel) to the axis of the cylinder block. This type of pump has good sealing performance, high working pressure (rated working pressure can generally reach 32-40MPa), and can still maintain a relatively high volumetric efficiency (generally around 95%) and total efficiency (generally around 90%) under high pressure. Above), it is easy to realize the advantages of variable and light weight per unit power; it is widely used in the fields of pressure processing machinery, lifting and transportation equipment, engineering machinery, ship deck machinery, metallurgical machinery, artillery and space technology, and can be used as 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 plunger to rotate, and by changing the angle between the plunger and the inclined plane or between the transmission shaft, the plunger is in the The plunger cavity makes linear reciprocating motion. Relying on the reciprocating movement of the plunger 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; Rotating together, 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 temperature of the cylinder rises faster under high-speed rotation. The wear of the valve plate, plunger and other parts directly affects the service life and durability of the pump. In addition, due to the limitation of the working principle of the plunger pump itself, each plunger can only achieve one oil suction and one oil discharge when the transmission shaft rotates one revolution, and its displacement is limited.

Contents of the invention

In order to overcome the above-mentioned defects existing in the existing axial plunger pump, the utility model provides a novel and compact structure, small size, light weight, simple transmission, easy speed regulation, high displacement, the use of plunger double degrees of freedom (rotational At the same time, it can move axially) to realize the two-dimensional axial piston pump with continuous suction and discharge of oil.

The two-dimensional axial plunger pump described in the utility model is characterized in that it includes a first cylinder body for oil in and out, a second cylinder body for flow distribution with the plunger, a plunger assembly, and a plunger assembly for realizing A drive assembly for two-degree-of-freedom movement of the assembly and an end cover for accommodating the plunger assembly, the first cylinder is sealed and fixedly connected with the first end of the second cylinder, and the second end of the second cylinder Sealed and fixedly connected with the end cover; the plunger assembly is accommodated in the plunger cavity of the end cover, and the plunger assembly is rotatably connected with the second cylinder;

The first cylinder block is provided with a low-pressure oil inlet passage and a high-pressure oil outlet passage, wherein the low-pressure oil inlet passage communicates with the fuel supply tank, and the high-pressure oil outlet passage communicates with the actuator;

The second cylinder block is provided with a central socket, two first communicating oil passages for communicating with the low-pressure oil inlet passages and two second communicating oil passages for communicating with the high-pressure oil outlet passages. The head end of the socket is embedded with a fitting for blocking the process hole, and the end is provided with a first bearing for supporting the plunger assembly; the first communicating oil passage corresponds to the low-pressure oil inlet passage one by one, and the first connecting oil passage corresponds to the low-pressure oil inlet passage. The two connected oil passages correspond to the high-pressure oil outlet passages one by one;

The plunger assembly includes a plunger, a spring and a spring seat, and the plunger is sequentially divided into a communication section for communicating with the oil passage of the second cylinder, a connection section for supporting the spring, and a connection section for connecting with the drive assembly. A fixed installation section, the communication section is provided with a pair of grooves for communication and cooperation with the communication oil passage, and the grooves can only be connected with one of the first communication oil passage or the second communication oil passage A corresponding communication; the connecting section of the plunger is inserted into the central through hole of the second cylinder, and the outer wall of the communicating section of the plunger is closely attached to the inner wall of the central through hole, and the connecting section is connected with the first bearing through the first bearing The second cylinder is rotatably connected, and the groove provided on the communication section is just positioned to communicate with the first communication oil passage and the second communication oil passage; the spring is sleeved on the connection section of the plunger, and One end of the spring is fixedly connected to the spring seat abutting against the end surface of the first bearing, and the other end abuts against the stepped surface formed by the connection section and the installation section;

The driving assembly includes a coupling, a roller shaft, a curved cam guide rail and a rolling assembly, and the installation section of the plunger is fixedly connected with an external drive motor through a coupling; the roller shaft and the installation section of the plunger fixedly connected, and the two ends of the roller shaft are symmetrically installed with rolling assemblies; the curved cam guide rail is embedded in the end cover, and one end surface of the curved cam is used as a smooth rolling surface for the rolling assembly to roll along its surface, The smooth rolling surface is distributed symmetrically, and when the rolling assembly moves to the lowest point of the smooth rolling surface, the first communication oil passage communicates with the groove of the plunger to realize the oil suction process of the plunger pump; the rolling assembly moves to the smooth When the rolling surface is at the highest point, the second communicating oil passage communicates with the groove of the plunger to realize the oil discharge process of the plunger pump.

The second cylinder block is provided with two first communicating oil passages and two second communicating oil passages, the first communicating oil passages and the second communicating oil passages are arranged along the axial direction of the second cylinder body , and the outer end of the first communicating oil passage and the outer end of the second communicating oil passage communicate with the low-pressure oil inlet passage and the high-pressure oil outlet passage respectively, the inner end of the first communicating oil passage, the second oil passage The inner ends of the two communicating oil passages pass through the cross-shaped communicating oil passages arranged radially along the second cylinder block. The center of the cross-shaped communicating oil passages is located on the central axis of the central through hole, and the cross-shaped communicating oil passages Each branch of each branch is in communication with the first communicating oil passage or the second communicating oil passage, the inner end of each branch is in communication with the central through hole, and the outer end of the branch extends to the second cylinder block , and the outer end of each branch is equipped with a set of seals consisting of steel balls and sealing pins.

Both the high-pressure oil outlet and the low-pressure oil inlet are Π-shaped oil passages, and the high-pressure oil outlet and the low-pressure oil inlet form an angle of 90°, wherein one end of the transverse channel of the Π-shaped oil passage extends to The outside of the first cylinder block forms corresponding low-pressure oil inlets or high-pressure oil outlets, and the two vertical channels of the low-pressure oil inlet passages respectively cooperate with the corresponding first communicating oil passages; the high-pressure oil outlet passages The two vertical passages of the two are respectively connected with the corresponding second communicating oil passages.

The plunger is a two-stage stepped shaft, wherein the outer diameters of the communication section, the connection section and the installation section gradually increase; the end of the communication section is provided with two rectangular grooves arranged symmetrically along its axis ; The mounting section is provided with a first U-shaped groove for snapping into the roller shaft, and the wall of the first U-shaped groove is correspondingly provided with through holes for positioning pins.

The roller shaft is fixedly connected to the installation section of the plunger through a positioning pin assembly, and the positioning pin assembly includes a first positioning pin, a first needle bearing, and a shaft for restricting the axial movement of the first needle bearing. Steel wire retaining ring, the middle part of the first positioning pin is fixedly connected with the middle part of the plunger installation part and the roller shaft, and the first positioning pin penetrates through the positioning pin through hole and then is socketed with the first needle roller bearing; the shaft uses a steel wire retaining ring The snare is caught in the first annular groove at the end of the first positioning pin.

The coupling includes a first mounting portion for snapping into the plunger mounting section and a second mounting portion for connecting with an external drive motor, the first mounting portion is provided with a second U-shaped groove and a third U-shaped groove, the installation section of the plunger is inserted into the second U-shaped groove, and the first needle bearing is stuck at the third U-shaped groove; the second installation part is A cylinder with a rectangular keyway, the second mounting part is inserted into the center hole of the curved surface cam guide rail, and closely fitted with it; the output shaft of the external drive motor is inserted into the rectangular keyway, wherein the side of the curved surface cam guide rail The wall is provided with positioning pin sockets for inserting positioning pins.

The rolling assembly includes a second needle roller bearing, a second bearing, and a round platform roller sleeve with a central step through hole. The two ends of the roller shaft are symmetrically installed in sequence from the inside to the outside. The second needle roller bearing, the round table type roller sleeve And the second bearing, the second bearing is stuck at the through hole of the central step, so as to realize the tight fit between the round platform roller sleeve and the roller shaft; the end of the roller shaft is provided with a second annular groove, and An elastic circlip for limiting the axial movement of the second bearing is embedded in the second annular groove.

The curved cam guide rail is a cylinder, and the curved cam guide rail is fixedly connected to the end cover through the second positioning pin, and the end surface of the curved cam guide rail facing the plunger side is a rolling surface, and the rolling surface is a symmetrical smooth arc shaped curved surface, and the smooth arc curved surface is provided with two highest points and two lowest points; a J shape for sealing and reducing friction is installed between the curved surface cam guide rail and the second mounting part of the coupling Skeleton oil seal and deep groove ball bearing.

Both the first bearing and the second bearing are thrust ball bearings.

The contact end surface of the first cylinder is provided with 4 annular sealing grooves and a total annular sealing groove, wherein the four annular sealing grooves are arranged at the high-pressure oil outlet and the low-pressure oil inlet, and one general annular sealing groove is arranged Ring on the outer ring of the contact end face of the first cylinder block, and ring the high-pressure oil outlet passage and the low-pressure oil inlet passage in the general annular sealing groove; the contact end surface of the end cover is provided with an end cover annular sealing groove for embedding the sealing ring .

The working principle is as follows: when the driving motor rotates, the torque is transmitted to the plunger through the coupling, the first needle bearing and the pin shaft. The tapered roller is mounted on the roller shaft and the roller shaft is fixedly connected with the plunger. The right end of the spring is fixedly connected with the plunger, and the left end is pressed on the thrust bearing through the spring seat. The plunger drives the roller shaft to rotate while rotating, and the roller is pressed on the cam guide rail under the action of the spring force, and the cam guide rail is pressed on the end cover. Due to the action of the cam guide rail, the plunger is forced to do reciprocating linear motion while rotating. Four windows are evenly distributed on the upper circumference of the cylinder body and flow passages are opened inside, two of which are high-pressure windows connected to it are high-pressure oil passages, and two of which are low-pressure windows connected to it are low-pressure oil passages. There are oil suction ports and oil discharge ports on the oil inlet and outlet cylinder block, and there are high-pressure oil passages and low-pressure oil passages inside to communicate with the high and low pressure oil passages on the cylinder body respectively to form high and low pressure oil passages. Two oil grooves are symmetrically arranged at the end of the plunger. When the roller moves to the highest point of the guide rail, the volume of the cavity decreases and the pressure increases. The cavity communicates with the high-pressure window through the two oil grooves on the plunger. The oil in the cavity The liquid flows into the high-pressure oil passage through the high-pressure window and is discharged from the oil discharge port. When the roller moves to the lowest point of the guide rail, the volume of the cavity becomes larger and a negative pressure is formed in the cavity. At this time, the cavity communicates with the low pressure window through the two oil grooves on the plunger, and the oil in the oil tank flows into the low pressure through the oil suction port. The oil passage flows through the low-pressure window and the oil groove on the plunger into the cavity. Every time the motor rotates one revolution, the cavity completes two oil discharges and two oil suctions.

The beneficial effects of the utility model are:

1) The integrated design of the shaft and the plunger is proposed, which greatly simplifies the overall structure, and uses the double-degree-of-freedom (2D) structure of the rotation and sliding of the plunger to replace the oil distribution plate structure of the traditional axial plunger pump to achieve Continuous oil suction and discharge function, and one reciprocating movement, one time for oil suction and one discharge, one more time than traditional 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, so that the efficiency is greatly improved.

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

4) The rectangular groove on the plunger communicates with the window on the cylinder body. 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 window discharges the oil in the chamber; the continuous reciprocating movement of the plunger makes the volume of the left and right chambers alternately change continuously, realizing continuous oil absorption and oil discharge.

Description of drawings

Fig. 1 is a structural schematic diagram of a two-dimensional axial piston pump of the present invention.

Figure 2 is an exploded view of the coupling of the present invention.

Fig. 3a is a schematic diagram of the plunger of the present invention.

Fig. 3b is a cross-sectional view of A-A in Fig. 3a.

Fig. 4 is a schematic cross-sectional view of when the plunger of the present invention moves to the rightmost end, the groove on the plunger does not communicate with the window oil passage on the second cylinder.

Fig. 5 is a schematic cross-sectional view of the plunger of the present invention when the plunger rotates and starts to move to the left end, and the grooves on the plunger communicate with the oil passages on the cylinder respectively.

Fig. 6 is a sectional view of the oil inlet and outlet cylinder and the cylinder oil suction channel of the utility model.

FIG. 7 is a cross-sectional view along line A-A of FIG. 6 .

Fig. 8 is a sectional view of the oil inlet and outlet cylinder and the cylinder oil discharge passage of the utility model.

Fig. 9 is a B-B sectional view of Fig. 8 .

Fig. 10 is a structural diagram of the curved cam guide rail of the present invention.

detailed description

Further illustrate the utility model below in conjunction with accompanying drawing

Referring to the attached picture:

Embodiment 1 The two-dimensional axial piston pump described in this utility model includes a first cylinder 1 for oil in and out, a second cylinder 4 for flow distribution with the plunger, and a plunger assembly 5 for realizing The driving assembly 6 for the two-degree-of-freedom movement of the plunger assembly and the end cover 7 for accommodating the plunger assembly, the first cylinder 1 is sealed and fixed with the first end of the second cylinder 4, and the second The second end of the cylinder body 4 is tightly connected with the end cover 7; the plunger assembly 5 is accommodated in the plunger chamber of the end cover 7, and the plunger assembly 5 is connected to the second cylinder Body 4 is rotationally connected;

The first cylinder block 1 is provided with a low-pressure oil inlet passage 11 and a high-pressure oil outlet passage 12, wherein the low-pressure oil inlet passage 11 communicates with the fuel supply tank, and the high-pressure oil outlet passage 12 communicates with the actuator ;

The second cylinder block 4 is provided with a central socket 41, two first communicating oil passages (42, 43) for communicating with the low-pressure oil inlet passage 11 and two first communicating oil passages (42, 43) for communicating with the high-pressure oil outlet passage 12. The second communication oil passage (44, 45), the head end of the central jack 41 is embedded with a fitting 9 for blocking the process hole (the fitting is an inner hexagonal screw plug), and the end is provided with a support for the plunger assembly 5 The first bearing 8; the first communicating oil passage (42, 43) corresponds to the low-pressure oil inlet passage 11 one by one, and the second communicating oil passage (44, 45) corresponds to the high-pressure oil outlet passage 12 one-to-one correspondence;

The plunger assembly 5 includes a plunger 51, a spring seat 52 and a spring 53. The plunger 51 is sequentially divided into a connecting section for communicating with the oil passage of the second cylinder, a connecting section for supporting the spring, and a connecting section for supporting the spring. The installation section for fixed connection with the drive assembly, the communication section is provided with a pair of grooves (511, 512) for communication and cooperation with the communication oil passage, and the grooves can only be connected with the first communication oil passage Or a corresponding communication in the second communication oil passage; the communication section of the plunger 51 is inserted into the central through hole 41 of the second cylinder 4, and the outer wall of the communication section of the plunger is connected to the inner wall of the central through hole closely fit, the connecting section is rotationally connected with the second cylinder 4 through the first bearing 8, and the groove provided on the communicating section is just positioned to be able to connect with the first communicating oil passage (42, 43) and the second The two communicating oil passages (44, 45) communicate; the spring 53 is sleeved on the connecting section of the plunger 51, and one end of the spring 53 is fixedly connected with the spring seat 52 against the end face of the first bearing 8, and the other One end rests on the step surface formed by the connection section and the installation section;

The drive assembly 6 includes a coupling 62, a roller shaft 63, a curved cam guide rail 64 and a rolling assembly 65, and the installation section of the plunger 51 is fixedly connected with the external drive motor through the coupling 62; the roller shaft 63 It is fixedly connected with the installation section of the plunger 51, and the two ends of the roller shaft 63 are respectively symmetrically installed with a rolling assembly 65; the curved cam guide rail 64 is embedded in the end cover 7, and the curved cam guide rail 64 One end surface serves as a smooth rolling surface 641 for the rolling assembly 65 to roll along its surface. The smooth rolling surface 641 is symmetrically distributed, and when the rolling assembly 65 moves to the lowest point of the smooth rolling surface 641, the first communicating oil passage (42 , 43) communicate with the grooves (511, 512) of the plunger to realize the oil suction process of the plunger pump; when the rolling assembly 65 moves to the highest point of the smooth rolling surface 641, the second communicating oil passage (44, 45 ) communicates with the grooves (511, 512) of the plunger to realize the oil discharge process of the plunger pump.

The second cylinder block 4 is provided with two first communicating oil passages (42, 43) and two second communicating oil passages (44, 45), and the first communicating oil passages (42, 43) are connected to the The second communicating oil passages (44, 45) are arranged axially along the second cylinder body 4, and the outer ends of the first communicating oil passages (42, 43), the second communicating oil passages (44, 45) ) outer ends communicate with the low-pressure oil inlet passage 11 and the high-pressure oil outlet passage 12 respectively, the inner ends of the first communication oil passages (42, 43), the second communication oil passages (44, 45) The inner end of the cross-shaped connecting oil passage 46 arranged radially along the second cylinder runs through, the center of the cross-shaped communicating oil passage 46 is located on the central axis of the central through hole 41, and the cross-shaped communicating oil passage 46 Each branch of each branch is communicated with the first communicating oil passage (42, 43) or the second communicating oil passage (44, 45), and the inner end of each branch communicates with the central through hole 41, The outer ends of the branches extend to the outside of the second cylinder 4 , and the outer ends of each branch are equipped with a set of seals 10 composed of steel balls 101 and pin shafts 102 .

The high-pressure oil outlet passage 12 and the low-pressure oil inlet passage 11 are both type oil passage, the high-pressure oil outlet passage 12 and the low-pressure oil inlet passage 11 form an angle of 90°, wherein One end of the horizontal passage of the type oil passage extends to the outside of the first cylinder 1 to form a corresponding low-pressure oil inlet or high-pressure oil outlet, and the two vertical flow passages of the low-pressure oil inlet 11 are respectively connected to the corresponding first cylinder block 1. A connecting oil passage (42, 43) is connected through; two vertical flow passages of the high-pressure oil outlet passage 12 are respectively connected with the corresponding second connecting oil passage (44, 45).

The plunger 51 is a two-stage stepped shaft, wherein the outer diameters of the communication section, the connection section and the installation section gradually increase; the end of the communication section is provided with two rectangular grooves arranged symmetrically along its axial direction Slots (511, 512); the installation section is provided with a first U-shaped groove 513 for snapping into the roller shaft 63, and the wall surface of the first U-shaped groove 513 is correspondingly provided with a positioning pin through hole 514.

The roller shaft 63 is fixedly connected to the mounting section of the plunger 51 through a positioning pin assembly 13, and the positioning pin assembly 13 includes a first positioning pin 131, a first needle bearing 132 and a first needle bearing for limiting 132 Steel wire retaining ring 133 for axially moving shaft, the middle part of the first positioning pin 131 is fixedly connected with the middle part of the plunger 51 installation part and the roller shaft 63, and the first positioning pin 131 passes through the rear sleeve of the positioning pin through hole 514 The first needle roller bearing 132 is connected; the steel wire retaining ring 133 for the shaft is sleeved in the first annular groove at the end of the first positioning pin 131 .

The coupling 62 includes a first mounting portion for snapping into the mounting section of the plunger 51 and a second mounting portion for connecting with an external drive motor, and the first mounting portion is provided with a second U-shaped groove 621 And the third U-shaped groove 622, the installation section of the plunger 51 is inserted into the second U-shaped groove 621, and the first needle bearing 132 is stuck in the third U-shaped groove 622 ; The second installation part is a cylinder with a rectangular keyway, the second installation part is inserted into the center hole of the curved surface cam guide rail 64, and closely fits with it; the output shaft of the external drive motor is inserted into the rectangular keyway , wherein the side wall of the curved surface cam guide rail 64 is provided with a positioning pin insertion hole 643 for inserting a positioning pin.

The rolling assembly 65 includes a second needle roller bearing 651, a second bearing 652, and a round platform roller sleeve 653 with a central stepped through hole. The two ends of the roller shaft 63 are symmetrically installed in sequence from the inside to the outside of the second needle roller bearing. 651, the round table type roller sleeve 653 and the second bearing 652, the second bearing 652 is stuck at the through hole of the central step to realize the tight fit between the round table type roller sleeve 653 and the roller shaft 63; the roller The end of the shaft 63 is provided with a second annular groove, and a circlip 654 for limiting the axial movement of the second bearing 652 is embedded in the second annular groove.

The curved cam guide 64 is a cylinder, and the curved cam guide 64 is fixedly connected with the end cap 7 through the second positioning pin 13, and the end surface of the curved cam guide 64 towards the plunger side is a rolling surface, and the rolling surface It is a symmetrical smooth arc-shaped surface, and the smooth arc-shaped surface is provided with two highest points and two lowest points; Sealed and friction-reducing J-frame oil seals and deep groove ball bearings.

Both the first bearing 8 and the second bearing 652 are thrust ball bearings.

The contact end surface of the first cylinder 1 is provided with four annular seal grooves 2 and one total annular seal groove 3, wherein the four annular seal grooves 2 are arranged in the high-pressure oil outlet passages (44, 45) and the low-pressure oil inlet passages. At the (42, 43) place, a general annular sealing groove 3 is arranged to surround the outer ring of the contact end face of the first cylinder body, and the high-pressure oil outlet passage and the low-pressure oil inlet passage are enclosed in the general annular sealing groove; the end cover The contact end surface of 7 is provided with the end cap annular sealing groove for embedding sealing ring.

The working principle is as follows: when the driving motor rotates, the torque of the driving motor is transmitted to the plunger 51 through the coupling 64 , the first needle bearing 132 and the first positioning pin 131 . The round table roller sleeve 653 is installed on the roller shaft 63 and the roller shaft 63 is fixedly connected with the plunger 51 . The right end of the spring 53 is fixedly connected with the plunger 51 , and the left end is pressed on the first bearing 8 by the spring seat 52 . The plunger 51 drives the roller shaft 63 to rotate while rotating, and the round platform roller sleeve 653 is pressed on the curved cam guide rail 64 under the action of spring force, and the curved cam guide rail 64 is pressed on the end cover 7 . Due to the effect of the cam guide rail 64 on the curved surface, the plunger 51 is forced to perform a reciprocating linear motion while rotating. Four communication passages are evenly distributed on the circumference of the second cylinder 4, two of which are the first communication passages (42, 43), which are connected to the low-pressure oil inlet passage 11, and two of which are the second communication passages (44, 43). 45), connected to it is the high-pressure oil outlet 12, the first cylinder body 1 is provided with a low-pressure oil inlet and a high-pressure oil outlet, and the internal low-pressure oil outlet 11 and high-pressure oil inlet 12 are respectively connected with the second The first communication channel (42, 43) and the second communication channel (44, 45) on the cylinder body 4 are connected to form a high and low pressure oil circuit. Two grooves (511, 512) are symmetrically arranged at the end of the plunger 51. When the round table roller sleeve 653 moves to the highest point of the curved cam guide rail 64, the volume of the cavity decreases and the pressure increases, and the cavity passes through the groove on the plunger 51. The two grooves (511, 512) communicate with the second communication oil passage (44, 45), and the oil in the cavity flows into the high-pressure oil outlet passage 12 through the second communication flow passage (44, 45) and from the high-pressure outlet Oil port discharge. When the round platform roller sleeve 653 moves to the lowest point of the guide rail, the volume of the cavity becomes larger and a negative pressure is formed in the cavity. At this time, the cavity passes through the two grooves (511, 512) on the plunger 51 to connect with the first flow channel. (42, 43) are connected, the oil in the oil tank flows into the low-pressure oil inlet passage 11 through the low-pressure oil inlet, and flows through the grooves (511, 512) on the first communication flow passage (42, 43) and the plunger 51 into the cavity. Every time the motor rotates one revolution, the cavity completes two oil discharges and two oil suctions.

In this embodiment, as shown in Figure 3a to Figure 5, the two rectangular grooves (511, 512) on the plunger 51 have their notch positions symmetrically staggered, that is, the notch of the groove 511 and the notch of the groove 512 in the opposite direction. The first communication channels (42, 43) and the second communication oil channels (44, 45) corresponding to the grooves (511, 512) on the second cylinder block 4, wherein the first communication channels (42, 43) The vertical oil passages (111, 112) of the low-pressure oil inlet passage 11 that are opened inside the oil inlet and outlet cylinders are connected to each other, and the second communicating oil passages (44, 45) are opened through the Π-shaped inside of the oil inlet and outlet cylinders. The vertical oil passages (121, 122) of the high-pressure oil outlet passage 12 communicate with each other.

As shown in Figure 4 and Figure 5, the plunger rotates counterclockwise, the first communicating passage (42, 43) and the second communicating oil passage (44, 45) are window passages on the cylinder block, and the low-pressure oil inlet passage 11 The vertical oil passages (111, 112) are oil suction passages, and the second communicating oil passages (44, 45) are oil discharge passages. The grooves ( 511 , 512 ) are rectangular grooves on the plunger 51 .

Figure 4 shows that when the plunger moves to the rightmost end, the rectangular grooves (511, 512) on the plunger 51 are not in contact with the vertical oil passages (111, 112) of the low-pressure oil inlet passage 11 on the cylinder block, and the high-pressure oil outlet. The vertical oil passages (121, 122) of road 12 communicate.

When the plunger rotates, it begins to move to the left end, as shown in Figure 5, the rectangular grooves (511, 512) on the plunger communicate with the second communicating oil passages (44, 45) on the cylinder respectively, and the volume gradually changes. The small chamber squeezes out the oil in the chamber through the second communicating oil passage (44, 45).

When the plunger continues to rotate, the plunger starts to move to the right, and the chamber starts to pass through the vertical oil passages (111, 112) communicating with the low-pressure oil inlet passage 11, and the first communication flow passage (42, 43) sucks oil from the fuel tank.

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

Claims (10)

1. Two-dimensional axial plunger pump, characterized in that it includes a first cylinder for oil inlet and outlet, a second cylinder for flow distribution with the plunger, a plunger assembly, and a plunger assembly for realizing double degrees of freedom A moving drive assembly and an end cover for accommodating the plunger assembly, the first cylinder is sealed and fixedly connected with the first end of the second cylinder, and the second end of the second cylinder is connected with the end The cover is sealed and fixed; the plunger assembly is accommodated in the plunger cavity of the end cover, and the plunger assembly is rotatably connected to the second cylinder; The first cylinder block is provided with a low-pressure oil inlet passage and a high-pressure oil outlet passage, wherein the low-pressure oil inlet passage communicates with the fuel supply tank, and the high-pressure oil outlet passage communicates with the actuator; The second cylinder block is provided with a central socket, two first communicating oil passages for communicating with the low-pressure oil inlet passages and two second communicating oil passages for communicating with the high-pressure oil outlet passages. The head end of the socket is embedded with a fitting for blocking the process hole, and the end is provided with a first bearing for supporting the plunger assembly; the first communicating oil passage corresponds to the low-pressure oil inlet passage one by one, and the first connecting oil passage corresponds to the low-pressure oil inlet passage. The two connected oil passages correspond to the high-pressure oil outlet passages one by one; The plunger assembly includes a plunger, a spring and a spring seat, and the plunger is sequentially divided into a communication section for communicating with the oil passage of the second cylinder, a connection section for supporting the spring, and a connection section for connecting with the drive assembly. A fixed installation section, the communication section is provided with a pair of grooves for communication and cooperation with the communication oil passage, and the grooves can only be connected with one of the first communication oil passage or the second communication oil passage A corresponding communication; the connecting section of the plunger is inserted into the central through hole of the second cylinder, and the outer wall of the communicating section of the plunger is closely attached to the inner wall of the central through hole, and the connecting section is connected with the first bearing through the first bearing The second cylinder is rotatably connected, and the groove provided on the communication section is just positioned to communicate with the first communication oil passage and the second communication oil passage; the spring is sleeved on the connection section of the plunger, and One end of the spring is fixedly connected to the spring seat abutting against the end surface of the first bearing, and the other end abuts against the stepped surface formed by the connection section and the installation section; The driving assembly includes a coupling, a roller shaft, a curved cam guide rail and a rolling assembly, and the installation section of the plunger is fixedly connected with an external drive motor through a coupling; the roller shaft and the installation section of the plunger The two ends of the roller shaft are fixedly connected, and the two ends of the roller shaft are symmetrically installed with rolling assemblies; the curved cam guide rail is embedded in the end cover, and one end surface of the curved cam guide rail is used as a smooth rolling surface for the rolling assembly to roll along its surface , the smooth rolling surface is distributed symmetrically, and when the rolling assembly moves to the lowest point of the smooth rolling surface, the first communicating oil passage communicates with the groove of the plunger to realize the oil suction process of the plunger pump; the rolling assembly moves to At the highest point of the smooth rolling surface, the second communicating oil passage communicates with the groove of the plunger to realize the oil discharge process of the plunger pump. 2. The two-dimensional axial piston pump according to claim 1, characterized in that: the second cylinder is provided with two first communicating oil passages and two second communicating oil passages, the first communicating oil passages Both the oil passage and the second communicating oil passage are arranged axially along the second cylinder block, and the outer ends of the first communicating oil passage and the second communicating oil passage are respectively connected to the low-pressure oil inlet passage and the The high-pressure oil outlet channel is connected, the inner end of the first communicating oil channel and the inner end of the second communicating oil channel are connected through a cross-shaped communicating oil channel arranged along the radial direction of the second cylinder, and the cross-shaped communicating oil channel The center of the oil passage is located on the central axis of the central through hole, and each branch of the cross-shaped communicating oil passage communicates with the first communicating oil passage or the second communicating oil passage, and each branch The inner end communicates with the central through hole, the outer end of the branch extends to the outside of the second cylinder, and the outer end of each branch is equipped with a set of sealing elements composed of steel balls and pin shafts. 3. The two-dimensional axial piston pump according to claim 2, characterized in that: the high-pressure oil outlet and the low-pressure oil inlet are both Π-shaped oil passages, and the high-pressure oil outlet and the The low-pressure oil inlet has an included angle of 90°, and one end of the transverse channel of the Π-shaped oil passage extends to the outside of the first cylinder to form a corresponding low-pressure oil inlet or high-pressure oil outlet, and two of the low-pressure oil inlets The vertical flow passages respectively cooperate with the corresponding first communicating oil passages; the two vertical passages of the high-pressure oil outlet passage respectively cooperate and communicate with the corresponding second communicating oil passages. 4. The two-dimensional axial piston pump according to claim 2, characterized in that: the plunger is a two-stage stepped shaft, wherein the outer diameters of the communication section, the connection section and the installation section are gradually Increase; the end of the connecting section is provided with two rectangular grooves arranged symmetrically along its axial direction; the installation section is provided with a first U-shaped groove for snapping into the roller shaft, and the wall surface of the first U-shaped groove Correspondingly, a positioning pin through hole is provided. 5. The two-dimensional axial piston pump according to claim 4, wherein the roller shaft is fixedly connected to the mounting section of the plunger through a positioning pin assembly, and the positioning pin assembly includes a first positioning pin , the first needle roller bearing and the steel wire retaining ring for the shaft used to limit the axial movement of the first needle roller bearing, the middle part of the first positioning pin is fixedly connected with the middle part of the plunger installation part and the roller shaft, and the first positioning pin After the pin passes through the through hole of the positioning pin, the first needle roller bearing is sleeved; the steel wire retaining ring for the shaft is sleeved in the first annular groove at the end of the first positioning pin. 6. The two-dimensional axial piston pump according to claim 1, wherein the coupling includes a first installation part for snapping into the installation section of the plunger and a second installation part for connecting with an external driving motor. Two installation parts, the first installation part is provided with a second U-shaped groove and a third U-shaped groove, the installation section of the plunger is inserted into the second U-shaped groove, and the first needle bearing It is stuck at the third U-shaped groove; the second installation part is a cylinder with a rectangular keyway, and the second installation part is inserted into the center hole of the curved surface cam guide rail and closely fits with it; the external The output shaft of the driving motor is inserted into the rectangular keyway, wherein the side wall of the curved surface cam guide rail is provided with a positioning pin socket for inserting a positioning pin. 7. The two-dimensional axial piston pump according to claim 1, characterized in that: the rolling assembly includes a second needle bearing, a second bearing and a round platform roller sleeve with a central step through hole, the roller shaft Install the second needle roller bearing, the round table roller sleeve and the second bearing symmetrically from the inside to the outside at both ends of the two ends, and the second bearing is stuck at the through hole of the central step to realize the connection between the round table roller sleeve and the The tight fit of the roller shaft; the end of the roller shaft is provided with a second annular groove, and a circlip for limiting the axial movement of the second bearing is embedded in the second annular groove. 8. The two-dimensional axial piston pump according to claim 1, characterized in that: the curved cam guide rail is a cylinder, the curved cam guide rail is fixedly connected to the end cover through the second positioning pin, and the curved surface The end face of the cam guide rail toward the plunger side is a rolling surface, and the rolling surface is a symmetrical smooth arc-shaped surface, and the smooth arc-shaped surface is provided with two highest points and two lowest points; the curved cam guide rail and the A J-shaped skeleton oil seal and deep groove ball bearings for sealing and reducing friction are installed between the second mounting parts of the coupling. 9. The two-dimensional axial piston pump according to claim 7, wherein the first bearing and the second bearing are both thrust ball bearings. 10. The two-dimensional axial piston pump according to any one of claims 1 to 9, characterized in that: the contact end surface of the first cylinder is provided with four annular seal grooves and one total annular seal groove, wherein Four annular sealing grooves are arranged at the high-pressure oil outlet passage and the low-pressure oil inlet passage, and one general annular sealing groove is arranged on the outer ring of the contact end surface of the first cylinder block, and connects the high-pressure oil outlet passage and the low-pressure oil passage. The oil inlet ring is in the general annular sealing groove; the contact end surface of the end cover is provided with an end cover annular sealing groove for embedding the sealing ring.