A motor-driven two-dimensional asymmetric hydraulic two-dimensional plunger pump

Abstract

The present application belongs to fluid machinery, disclose a kind of motor-driven two-dimensional asymmetric hydraulic two-dimensional plunger pump, including motor module, cam transmission module and plunger cylinder module;Plunger cylinder module includes inner cylinder, outer cylinder, plunger, inner cylinder is fixed in outer cylinder, plunger is inserted in inner cylinder.The cam transmission module structure design of the present application adopts the single cam guide rail of rotary type and the fixed double roller frame, plunger can drive cam guide rail rotation, and cam guide rail drives piston to move left and right again.By this setting, the size of the entire pump is significantly reduced, so that the plunger has both rotary motion and reciprocating motion formed by plane motion, improve the reliability of two-dimensional plunger pump, and have small volume, light weight, simple manufacturing process, can adapt to the use effect of high pressure.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of fluid machinery, in particular to a motor-driven two-dimensional asymmetric hydraulic two-dimensional plunger pump. BACKGROUND

[0002] Hydraulic pump is the power device of hydraulic transmission system, which converts the mechanical energy of prime mover into pressure energy of liquid, and plays a decisive role in system performance and working efficiency. The plunger pump has the characteristics of compact structure, high efficiency, high pressure, high speed and large flow, and is very suitable for application scenarios with large power density. The products currently put into the market are mainly based on the structure of axial plunger. Although the plunger pump has the advantages of high parameter precision, high efficiency and long service life, the structure of the pump is complex, the number of parts is large, the manufacturing process is high, the cost is high, the oil is sensitive to pollution, and the use and maintenance requirements are high. Professor Ruan Jian of Zhejiang University of Technology proposed the working principle of two-dimensional hydraulic elements, and the double-degree-of-freedom motion principle was first used in the design of the valve core of 2D valve. Today, it is used in the design of plunger, which has the functions of oil suction and oil distribution, and becomes a new type of flow distribution method. The plunger pump designed by using this principle not only has a novel structure, but also has a smaller size, a lighter weight, and can effectively reduce oil leakage, large working noise and other problems caused by hydraulic drive. Compared with the traditional axial plunger pump, the two-dimensional (2D) axial plunger pump has the advantages of simple structure, high efficiency, and better meets the development requirements of high speed, high pressure and large flow. However, the two-dimensional (2D) plunger pump still has some deficiencies in size, oil utilization rate and high pressure resistance. SUMMARY

[0003] The purpose of the present application is to provide a motor-driven two-dimensional asymmetric hydraulic two-dimensional plunger pump to solve the problems raised in the background art.

[0004] To achieve the above purpose, the present application provides the following technical scheme:

[0005] A motor-driven two-dimensional asymmetric hydraulic two-dimensional plunger pump, comprising a motor module, a cam transmission module and a plunger cylinder module;

[0006] The plunger cylinder module comprises an inner cylinder, an outer cylinder and a plunger, the inner cylinder is fixedly inserted into the outer cylinder, and the plunger is inserted into the inner cylinder, the plunger can rotate circumferentially and move axially relative to the inner cylinder, the plunger is in transmission cooperation with the motor module, and the cam transmission module is sleeved on the plunger and inserted into the inner cylinder;

[0007] The cam transmission module comprises two roller frames arranged oppositely and fixedly installed in the inner cylinder body, a plurality of rollers are uniformly arranged on one side of each roller frame opposite to the other roller frame, a cam guide rail is arranged between the two roller frames, saddle-shaped annular guide rail curves are arranged on the left and right sides of the cam guide rail respectively, the annular guide rail curves on the left and right sides of the cam guide rail are connected with the rollers on the two roller frames respectively, the annular guide rail curves on the left and right sides are parallel to each other, the left end of the plunger is rotatably inserted into the two roller frames, the plunger is rotatably inserted into the cam guide rail, and the plunger can drive the cam guide rail to rotate together;

[0008] The plunger makes reciprocating and rotating compound motion under the driving of the motor module and the guidance of the cam transmission module, so that the plunger pump completes the work of sucking and discharging oil.

[0009] Further, the right end of the plunger is provided with a boss which is movably inserted into the plunger cavity, a left cavity is formed between the left end of the boss and the inner cylinder body, a right cavity is formed between the right end of the boss and the inner cylinder body, a left oil distribution groove group and a right oil distribution groove group are arranged on the outer wall of the boss respectively, the left oil distribution groove group comprises a plurality of left oil distribution grooves which are arranged in a ring, the left end of the left oil distribution groove is in communication with the left cavity, the right oil distribution groove group comprises a plurality of right oil distribution grooves which are arranged in a ring, the right end of the right oil distribution groove is in communication with the right cavity, and the left end of the right oil distribution groove is closed;

[0010] The left part of the inner cylinder body has a cam cavity for installing the cam transmission module, and the right part has a plunger cavity for being inserted into the plunger, annular left cylinder body oil discharge grooves, intermediate cylinder body oil suction grooves and right cylinder body oil discharge grooves are sequentially arranged on the outer wall of the right part of the inner cylinder body, left oil discharge window, left oil suction window, right oil suction window and right oil discharge window which are all communicated with the plunger cavity are sequentially arranged on the outer wall of the right part of the inner cylinder body, the left oil suction window and the right oil suction window are communicated with the intermediate cylinder body oil suction grooves, the left oil discharge window is communicated with the left cylinder body oil discharge grooves, and the right oil discharge window is communicated with the right cylinder body oil discharge grooves;

[0011] The outer wall of the outer cylinder body is sequentially provided with left outer cylinder body oil discharge grooves, outer cylinder body oil suction grooves and right outer cylinder body oil discharge grooves, the left outer cylinder body oil discharge grooves are communicated with the left cylinder body oil discharge grooves, the outer cylinder body oil suction grooves are communicated with the intermediate cylinder body oil suction grooves, and the right outer cylinder body oil discharge grooves are communicated with the right cylinder body oil discharge grooves;

[0012] The two-dimensional plunger pump has a left cavity oil suction state, a zero position state and a right cavity oil suction state, and the two-dimensional plunger pump switches between the three states through the reciprocating and rotating compound motion of the plunger;

[0013] When the two-dimensional plunger pump is in the left cavity oil suction state, the left oil suction window is communicated with the left oil distribution groove, so that the outer cylinder oil suction groove, the inner cylinder intermediate oil suction groove, the left oil suction window, the left oil distribution groove and the left cavity form a left cavity oil suction passage; the right oil discharge window is communicated with the right oil distribution groove, so that the right outer cylinder oil discharge groove, the inner cylinder right oil discharge groove, the right oil discharge window, the right oil distribution groove and the right cavity form a right cavity oil discharge passage.

[0014] When the two-dimensional plunger pump is in the zero position state, the left oil distribution groove is not communicated with the left oil suction window, the right oil suction window, the left oil discharge window and the right oil discharge window, and the right oil distribution groove is not communicated with the left oil suction window, the right oil suction window, the left oil discharge window and the right oil discharge window.

[0015] When the two-dimensional plunger pump is in the right cavity oil suction state, the right oil suction window is communicated with the right oil distribution groove, so that the outer cylinder oil suction groove, the inner cylinder intermediate oil suction groove, the right oil suction window, the right oil distribution groove and the right cavity form a right cavity oil suction passage; the left oil discharge window is communicated with the left oil distribution groove, so that the left outer cylinder oil discharge groove, the inner cylinder left oil discharge groove, the left oil discharge window, the left oil distribution groove and the left cavity form a left cavity oil discharge passage.

[0016] Further, the left outer cylinder oil discharge groove of the outer cylinder is communicated with the inner cylinder left oil discharge groove through a plurality of annular left outer cylinder oil discharge through holes, the outer cylinder oil suction groove of the outer cylinder is communicated with the inner cylinder intermediate oil suction groove through a plurality of annular outer cylinder oil suction through holes, and the right outer cylinder oil discharge groove of the outer cylinder is communicated with the inner cylinder right oil discharge groove through a plurality of annular right outer cylinder oil discharge through holes.

[0017] Further, the inner cylinder right part inner wall is fixedly inserted with a support sleeve, the plunger is slidably inserted into the support sleeve, and the left cavity is located between the right side of the support sleeve and the left side of the boss.

[0018] Further, the right end inner wall of the inner cylinder is inserted with a right plug, and the right cavity is located between the right side of the boss and the left side of the right plug.

[0019] Further, the motor module comprises a pump body shell, a motor, a coupling, and a fork, the pump body shell is fixedly connected with the inner cylinder, the motor is arranged in the pump body shell, the coupling is fixedly connected with the plunger, a rotating disc is arranged on the main shaft of the motor, the rotating disc is connected with the left end of the fork, the right end of the fork is connected with the coupling, and the fork can drive the coupling to rotate and the coupling can move axially relative to the fork.

[0020] Further, a notch is arranged on the coupling, the fork is engaged with the notch, and the coupling can slide axially on the fork through the notch.

[0021] Further, the motor module further comprises a left end cover, a navigation plug, a bearing, a magnetic steel, a left support and a circuit board, the left end cover is arranged at the left end of the pump body shell, the navigation plug is arranged on the pump body shell, the rotating disc of the motor is rotatably installed with the pump body shell through the bearing, the left support is located at the left side of the motor and is arranged between the left end cover and the pump body shell, the circuit board is arranged between the left end cover and the left support, and the magnetic steel is arranged at the left end of the main shaft of the motor.

[0022] Compared with the prior art, the beneficial effects of the present application are:

[0023] 1) The cam transmission module structure adopts a rotating single cam guide rail and a fixed double roller frame, the plunger can drive the cam guide rail to rotate, and the cam guide rail drives the piston to move left and right. Through the setting, the size of the whole pump is significantly reduced, the plunger has both rotary motion and reciprocating motion formed by plane motion, the reliability of the two-dimensional plunger pump is improved, and the use effect of small size, light weight, simple manufacturing process and high pressure adaptability is achieved.

[0024] 2) The cylinder body oil suction and discharge adopts an asymmetric structure design, in the rotating process, only the middle oil groove is suctioned from the oil cylinder, the left and right oil grooves are all discharged outward, a group of oil suction ports are connected with the oil suction cavity for oil suction, and another group of non-working oil suction ports are connected with the oil tank for returning excess oil to the oil tank, so that the oil utilization rate is higher and the structure is more compact. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 The present application is a decomposition structure schematic diagram.

[0026] Figure 2 The present application is a structure schematic diagram.

[0027] Figure 3 The present application is a longitudinal section structure schematic diagram.

[0028] Figure 4 The present application is one of the inner cylinder body structure schematic diagrams.

[0029] Figure 5 The present application is Figure 4 A-A sectional view.

[0030] Figure 6 The present application is the second inner cylinder body structure schematic diagram, the inner cylinder body in the figure is rotated by 90° relative to Figure 5 The present application is the second inner cylinder body structure schematic diagram, the inner cylinder body in the figure is rotated by 90° relative to

[0031] Figure 7 The present application is Figure 4 B-B sectional view.

[0032] Figure 8 The present application is an outer cylinder body structure schematic diagram.

[0033] Figure 9 For Figure 8 C-C profile in the middle.

[0034] Figure 10 For Figure 8 D-D profile in the middle.

[0035] Figure 11 The schematic diagram of the plunger structure in the application.

[0036] Figure 12 The schematic diagram of the motor, fork, shaft coupling and plunger connection structure in the application.

[0037] Figure 13 The schematic diagram of the cam transmission module structure in the application.

[0038] Figure 14 The schematic diagram of the cam guide rail structure in the application.

[0039] In the figure: 1 motor module; 1101 left end cover; 102 navigation plug; 103 motor; 104 bearing; 105 pump body shell; 106 shaft coupling; 107 fork; 108 rotating disc; 109 magnetic steel; 110 left support; 111 circuit board; 2 cam transmission module; 201 including roller frame; 202 cam guide rail; 202A annular guide rail curve; 202B cam hole; 203 roller; 3 plunger cylinder module; 301 inner cylinder; 301A left oil drain groove of inner cylinder; 301B middle oil suction groove of inner cylinder; 301C right oil drain groove of inner cylinder; 301E left oil suction window; 301F right oil suction window; 301I left oil drain window; 301J right oil drain window; 302 outer cylinder; 302A left outer cylinder oil drain groove; 302B outer cylinder oil suction groove; 302C right outer cylinder oil drain groove; 303 sealing ring; 304 right plug; 305 plunger; 305A left oil distribution groove; 305B right oil distribution groove; 305C boss; 306 support sleeve; 307 left cavity; 309 right cavity. DETAILED DESCRIPTION

[0040] The technical solutions in the embodiments of the application will be described clearly and completely below with reference to the drawings in the embodiments of the application. Obviously, the described embodiments are only part of the embodiments of the application, rather than all the embodiments of the application. Based on the embodiments in the application, all other embodiments obtained by a person of ordinary skill in the art without creative work fall within the protection scope of the application.

[0041] Please refer to Figures 1-14The utility model provides a motor-driven two-dimensional asymmetric hydraulic two-dimensional plunger pump, including motor module 1, cam drive module 2 and plunger cylinder module 3, plunger cylinder module 3 includes inner cylinder 301, outer cylinder 302, plunger 305, inner cylinder 301 is fixed and is inserted in outer cylinder 302, plunger 305 is inserted in inner cylinder 301, plunger 305 can rotate and move axially relative to inner cylinder 301, plunger 305 is transmission cooperation with motor module 1, cam drive module 2 is sleeved on plunger 305 and is inserted on inner cylinder 301, plunger 305 does reciprocating rotation compound motion under the drive of motor module 1 and the guidance of cam drive module 2, and plunger pump completes the work of sucking and discharging oil.

[0042] With reference to the foregoing Figures 3-11The right end of the plunger 305 is provided with a boss 305C which is movably inserted into the plunger cavity, the left end of the boss 305C and the inner cylinder body 301 form a left cavity 307, the right end of the boss 305C and the inner cylinder body 301 form a right cavity 309, the outer wall of the boss 305C is provided with a left oil distribution groove assembly and a right oil distribution groove assembly, the left oil distribution groove assembly includes a plurality of annular left oil distribution grooves 305A, the left end of the left oil distribution groove 305A is in communication with the left cavity 307, the right oil distribution groove assembly includes a plurality of annular right oil distribution grooves 305B, the right end of the right oil distribution groove 305B is in communication with the right cavity 309, the left oil distribution groove 305A and the right oil distribution groove 305B are U-shaped grooves, and the left oil distribution groove 305A and the right oil distribution groove 305B are staggered in the circumferential direction at a fixed angle. In this embodiment, the left oil distribution groove 305A has two and is axially symmetrically distributed, the right oil distribution groove 305B also has two and is axially symmetrically distributed, and the left oil distribution groove 305A and the right oil distribution groove 305B are staggered at an interval of 90 degrees. The left part of the inner cylinder body 301 has a cam cavity for mounting the cam transmission module 2, and the right part has a plunger cavity for plugging with the plunger 305, the outer wall of the right part of the inner cylinder body 301 is sequentially provided with an annular inner cylinder body left oil discharge groove 301A, an inner cylinder body middle oil suction groove 301B and an inner cylinder body right oil discharge groove 301C, and the outer wall of the right part of the inner cylinder body 301 is further sequentially provided with a left oil discharge window 301I, a left oil suction window 301E, a right oil suction window 301F and a right oil discharge window 301J which are all in communication with the plunger cavity, the left oil suction window 301E and the right oil suction window 301F are in communication with the inner cylinder body middle oil suction groove 301B, the left oil discharge window 301I is in communication with the inner cylinder body left oil discharge groove 301A, and the right oil discharge window 301J is in communication with the inner cylinder body right oil discharge groove 301C. The outer wall of the outer cylinder body 302 is sequentially provided with an annular left outer cylinder body oil discharge groove 302A, an outer cylinder body oil suction groove 302B and a right outer cylinder body oil discharge groove 302C, the left outer cylinder body oil discharge groove 302A is in communication with the inner cylinder body left oil discharge groove 301A, the outer cylinder body oil suction groove 302B is in communication with the inner cylinder body middle oil suction groove 301B, and the right outer cylinder body oil discharge groove 302C is in communication with the inner cylinder body right oil discharge groove 301C. Among them, the left oil discharge window 301I, the left oil suction window 301E, the right oil suction window 301F and the right oil discharge window 301J are all symmetrically provided with two, the left oil discharge window 301I and the right oil discharge window 301J are coincident in position in the circumferential direction, the left oil suction window 301E and the right oil suction window 301F are coincident in position in the circumferential direction, and the oil suction window and the oil discharge window are staggered at an interval of 90 degrees.

[0043] The two-dimensional plunger pump has a left cavity oil suction state, a zero position state and a right cavity oil suction state, and the two-dimensional plunger pump switches between the three states through the reciprocating and rotating combined motion of the plunger 305.

[0044] When the two-dimensional plunger pump is in the left cavity oil suction state, the left oil suction window 301E is communicated with the left oil distribution groove 305A, so that the outer cylinder oil suction groove 302B, the intermediate oil suction groove 301B of the inner cylinder, the left oil suction window 301E, the left oil distribution groove 305A, the left oil distribution groove 305A and the left cavity 307 form a left cavity oil suction passage, and the oil enters the left cavity 307 through the passage. The right oil discharge window 301J is communicated with the right oil distribution groove 305B, so that the right outer cylinder oil discharge groove 302C, the right oil discharge groove 301C of the inner cylinder, the right oil discharge window 301J, the right oil distribution groove 305B and the right cavity 309 form a right cavity oil discharge passage, and the oil in the right cavity 309 is discharged through the passage.

[0045] When the two-dimensional plunger pump is in the zero position state, the left oil distribution groove 305A is not communicated with the left oil suction window 301E, the right oil suction window 301F, the left oil discharge window 301I and the right oil discharge window 301J, and the right oil distribution groove 305B is not communicated with the left oil suction window 301E, the right oil suction window 301F, the left oil discharge window 301I and the right oil discharge window 301J, at this time the two-dimensional plunger pump does not suck and discharge.

[0046] When the two-dimensional plunger pump is in the right cavity oil suction state, the right oil suction window 301F is communicated with the right oil distribution groove 305B, so that the outer cylinder oil suction groove 302B, the intermediate oil suction groove 301B of the inner cylinder, the right oil suction window 301F, the right oil distribution groove 305B and the right cavity 309 form a right cavity oil suction passage, and the oil enters the right cavity 309 through the passage. The left oil discharge window 301I is communicated with the left oil distribution groove 305A, so that the left outer cylinder oil discharge groove 302A, the left oil discharge groove 301A of the inner cylinder, the left oil discharge window 301I, the left oil distribution groove 305A and the left cavity 307 form a left cavity oil discharge passage, and the oil in the left cavity 307 is discharged through the passage.

[0047] Continue to refer to Figures 8-10 The left outer cylinder oil discharge groove 302A of the outer cylinder 302 is communicated with the left oil discharge groove 301A of the inner cylinder 301 through a plurality of uniformly distributed left outer cylinder oil discharge holes 302D, the outer cylinder oil suction groove 302B of the outer cylinder 302 is communicated with the intermediate oil suction groove 301B of the inner cylinder 301 through a plurality of uniformly distributed outer cylinder oil suction holes 302E, and the right outer cylinder oil discharge groove 302C of the outer cylinder 302 is communicated with the right oil discharge groove 301C of the inner cylinder 301 through a plurality of uniformly distributed right outer cylinder oil discharge holes 302F.

[0048] Continue to refer to Figure 3 The inner cylinder right inner wall is fixedly inserted with a support sleeve 306, and the plunger 305 is slidably inserted into the support sleeve 306. The left cavity 307 is located between the right side of the support sleeve 306 and the left side of the boss 305C. The right end inner wall of the inner cylinder 301 is inserted with a right plug 304, and the right cavity 309 is located between the right side of the boss 305C and the left side of the right plug 304.

[0049] Continue to refer toFigure 3 And Figure 12 The motor module 1 comprises a pump body shell 105, a motor 103, a shaft coupling 106, two shift forks 107, the pump body shell 105 is fixedly connected with the inner cylinder body 301, the motor 103 is preferably a three-phase motor 103, which is arranged in the pump body shell 105, the shaft coupling 106 is fixedly connected with the plunger 305, a rotating disc 108 is arranged on the main shaft of the motor 103, the rotating disc 108 is connected with the left ends of the two shift forks 107, the right ends of the shift forks 107 are connected with the shaft coupling 106, the shift forks 107 can drive the shaft coupling 106 to rotate and the shaft coupling 106 can move axially relative to the shift forks 107. A plurality of left and right through notches 106A are uniformly arranged on the shaft coupling 106, the shift forks 107 are engaged with the notches 106A, and the shaft coupling 106 can slide axially on the shift forks 107 through the notches 106A.

[0050] Further referring to Figure 3 The motor module 1 further comprises a left end cover 101, a navigation plug 102, a bearing 104, a magnetic steel 109, a left support 110 and a circuit board 111, the left end cover 101 is arranged at the left end of the pump body shell 105, the navigation plug 102 is arranged on the pump body shell 105, the rotating disc 108 of the motor 103 is rotatably installed on the pump body shell 105 through the bearing 104, the left support 110 is located at the left side of the motor 103 and is arranged between the left end cover 101 and the pump body shell 105, the circuit board 111 is arranged between the left end cover 101 and the left support 110, the magnetic steel 109 is arranged at the left end of the main shaft of the motor 103, and the magnetic steel 109 rotates together with the main shaft of the motor 103, and the circuit board 111 is provided with an encoder, which collects the magnetic steel signal.

[0051] Continuously referring to Figure 3 And Figure 13 The cam transmission module 2 comprises two roller frames 201 which are oppositely arranged and fixedly installed in the inner cylinder body 301, a plurality of rollers 203 are uniformly arranged on one side of each roller frame 201 opposite to the other roller frame 201, a cam guide rail 202 is arranged between the two roller frames 201, saddle-shaped annular guide rail curves 202A are arranged on the left and right sides of the cam guide rail 202 respectively, the annular guide rail curves 202A on the left and right sides of the cam guide rail 202 are connected with the rollers 203 on the two roller frames 201 respectively, the annular guide rail curves 202A on the left and right sides are parallel to each other, the left end of the plunger 305 is rotatably inserted into the two roller frames 201, the plunger 305 is drivingly inserted into the cam guide rail 202, and the plunger 305 can drive the cam guide rail 202 to rotate together. The cam guide rail 202 has a square cam center hole 202B, and the plunger 305 has a part matching the shape and size of the cam center hole 202B, and the part is inserted into the cam center hole 202B.

[0052] It should be noted that the shape design and working principle of the annular guide rail curve surface 202A can refer to the first guide rail curve surface 260 and the second guide rail curve surface 270 in the patent CN115726943A.

[0053] The specific working process is as follows:

[0054] Taking the counterclockwise rotation of the motor as an example, when the plunger 305 rotates counterclockwise under the driving of the motor, the cam guide rail 203 also rotates counterclockwise at this moment. Since the cam guide rail 203 and the plunger 305 are connected together, the roller 203 rolls relative to the plunger 305 to the concave part of the annular guide rail curve surface 202A of the cam guide rail 203, driving the plunger 305 to move to the right. The left oil suction window 301E of the inner cylinder body 301 and the left oil distribution groove 305A are gradually increased in communication area, the left oil distribution groove 305A in the plunger 305 is communicated with the left cavity 307, and the left cavity 307 starts to suck oil from the oil tank through the inner cylinder body middle oil suction groove 301B and the outer cylinder body oil suction groove 302B. As the area of the oil inlet and the oil suction groove gradually increases, the oil suction gradually increases. At the same time, the volume of the right cavity 309 gradually decreases, the right oil distribution groove 305B in the plunger 305 and the right oil discharge window 301J of the inner cylinder body 301 are communicated, and as the volume of the right cavity 309 decreases, the oil in the cavity is discharged to the outside through the right oil discharge window 301J and the right outer cylinder body oil discharge groove 302C. As the area of the oil outlet and the oil discharge groove gradually increases, the oil discharge also gradually increases.

[0055] When the plunger 305 moves to the middle of the stroke, the communication area between the plunger 305 and the left side of the inner cylinder body 301 reaches the maximum, and the oil suction reaches the maximum. As the cam guide rail 202 continues to rotate, the communication area becomes smaller and smaller. When the plunger 305 reaches the rightmost position, i.e. the roller 203 is located at the lowest part of the annular guide rail curve surface 202A relative to the cam guide rail 202, the left oil distribution groove 305A on the plunger 305 and the left oil suction window 301E on the inner cylinder body 301 are isolated. The inner cylinder body middle oil suction groove 305B on the plunger 305 and the right oil discharge window 301J on the inner cylinder body 301 are isolated, and the oil groove of the plunger 305 is in a closed state with the communication channel of the inner cylinder body 301. If the plunger 305 continues to rotate, the cam guide rail 202 starts to rotate from the concave part of the curve to the convex part, driving the plunger 305 to move to the left. At this time, the volume change of the inner cylinder body 301 inside and the previous communication condition are just the opposite, the left oil suction groove becomes an oil discharge groove, and the volume of the left cavity 307 gradually decreases from the maximum. At this time, the left cavity 307 discharges oil to the outside through the left oil discharge window 301I of the inner cylinder body 301 and the left outer cylinder body oil discharge groove 302A. At the same time, the volume of the right cavity 309 gradually increases from the minimum, the right oil discharge groove of the plunger 305 becomes an oil suction groove, and the right cavity 309 sucks oil from the oil tank through the right oil suction window 301F and the inner cylinder body middle oil suction groove 302B.

[0056] The above process is that the plunger 305 reciprocates once, and the left and right oil chambers of the plunger 305 complete the process of oil suction and discharge once. It can be obtained that the plunger 305 rotates one round and reciprocates twice, and the left and right oil chambers of the plunger 305 complete the process of oil suction and discharge twice. In actual work, the described process is continuous, and it can be seen that it has high oil suction and discharge performance. The plunger 305 is rotated by the motor 103, the plunger 305 drives the cam guide rail 202 to rotate, and the rotation of the cam guide rail 202 can drive the left and right movements of the plunger 305. At the same time, according to the special design of the inner cylinder body 301, oil is sucked from the middle oil suction groove 301B of the inner cylinder body each time, and oil is discharged from the left oil discharge groove 301A of the inner cylinder body and the right oil discharge groove 301C of the outer cylinder body. The asymmetric requirement is achieved. This reciprocating movement mode promotes the left chamber 307 and the right chamber 309 to continuously switch the oil suction and discharge chambers, and realizes the function of pumping the oil in the oil tank out.

[0057] Although embodiments of the present application have been shown and described, it is to be understood that various modifications, substitutions, alternatives and variations can be made to these embodiments without departing from the principles and spirit of the present application, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A motor-driven two-dimensional asymmetric hydraulic two-dimensional piston pump, characterized in that, It includes a motor module (1), a cam drive module (2), and a plunger cylinder module (3); The plunger cylinder module (3) includes an inner cylinder (301), an outer cylinder (302), and a plunger (305). The inner cylinder (301) is fixedly inserted into the outer cylinder (302), and the plunger (305) is inserted into the inner cylinder (301). The plunger (305) can rotate circumferentially and move axially relative to the inner cylinder (301). The plunger (305) is driven by the motor module (1). The cam transmission module (2) is fitted onto the plunger (305) and inserted into the inner cylinder (301). The cam transmission module (2) includes two roller frames (201) that are arranged opposite to each other and fixedly installed in the inner cylinder (301). Each roller frame (201) has several rollers (203) evenly arranged on one side opposite to the other roller frame (201). A cam guide rail (202) is provided between the two roller frames (201). Saddle-shaped annular guide rail surfaces (202A) are provided on the left and right sides of the cam guide rail (202). The annular guide rail surfaces (202A) on the left and right sides of the cam guide rail (202) are respectively connected to the rollers (203) on the two roller frames (201). The annular guide rail surfaces (202A) on the left and right sides are parallel to each other. The left end of the plunger (305) is rotatably inserted with the two roller frames (201). The plunger (305) is driven to insert with the cam guide rail (202). The plunger (305) can drive the cam guide rail (202) to rotate together. The plunger (305) performs a reciprocating rotary compound motion under the drive of the motor module (1) and the guidance of the cam transmission module (2), so that the plunger pump can complete the work of sucking and discharging oil. The right end of the plunger (305) is provided with a boss (305C) that is movably inserted into the plunger cavity. The left end of the boss (305C) forms a left cavity (307) with the inner cylinder (301), and the right end of the boss (305C) forms a right cavity (309) with the inner cylinder (301). The outer wall of the boss (305C) is provided with a left oil distribution groove group and a right oil distribution groove group respectively. The left oil distribution groove group includes several annularly arranged left oil distribution grooves (305A). The left end of the left oil distribution groove (305A) is connected to the left cavity (307). The right oil distribution groove group includes several annularly arranged right oil distribution grooves (305B). The right end of the right oil distribution groove (305B) is connected to the right cavity (309). The left side of the inner cylinder (301) has a cam cavity for mounting the cam drive module (2), and the right side has a plunger cavity for mating with the plunger (305). The outer wall of the right side of the inner cylinder (301) is provided with annular left oil drain groove (301A), middle oil suction groove (301B), and right oil drain groove (301C) in sequence. The outer wall of the right side of the inner cylinder (301) is also provided with left oil drain grooves that are all connected to the plunger cavity in sequence. The cylinder has an oil window (301I), a left oil suction window (301E), a right oil suction window (301F), and a right oil discharge window (301J). The left oil suction window (301E) and the right oil suction window (301F) are connected to the middle oil suction groove (301B) of the inner cylinder. The left oil discharge window (301I) is connected to the left oil discharge groove (301A) of the inner cylinder. The right oil discharge window (301J) is connected to the right oil discharge groove (301C) of the inner cylinder. The outer wall of the outer cylinder (302) is provided with a left outer cylinder oil drain groove (302A), an outer cylinder oil suction groove (302B), and a right outer cylinder oil drain groove (302C) in sequence. The left outer cylinder oil drain groove (302A) is connected to the left oil drain groove (301A) of the inner cylinder, the outer cylinder oil suction groove (302B) is connected to the middle oil suction groove (301B) of the inner cylinder, and the right outer cylinder oil drain groove (302C) is connected to the right oil drain groove (301C) of the inner cylinder. The two-dimensional plunger pump has a left chamber oil suction state, a zero position state and a right chamber oil suction state. The two-dimensional plunger pump switches between the three states through the reciprocating rotational compound motion of the plunger (305). When the two-dimensional plunger pump is in the left chamber suction state, the left suction window (301E) is connected to the left distribution groove (305A), so that the outer cylinder suction groove (302B), the inner cylinder middle suction groove (301B), the left suction window (301E), the left distribution groove (305A), and the left chamber (307) constitute the left chamber suction passage; the right discharge window (301J) is connected to the right distribution groove (305B), so that the right outer cylinder discharge groove (302C), the inner cylinder right discharge groove (301C), the right discharge window (301J), the right distribution groove (305B), and the right chamber (309) constitute the right chamber discharge passage; When the two-dimensional plunger pump is in the zero position, the left oil distribution groove (305A) is not connected to the left oil suction window (301E), the right oil suction window (301F), the left oil discharge window (301I), and the right oil discharge window (301J), and the right oil distribution groove (305B) is not connected to the left oil suction window (301E), the right oil suction window (301F), the left oil discharge window (301I), and the right oil discharge window (301J); When the two-dimensional plunger pump is in the right chamber oil suction state, the right oil suction window (301F) is connected to the right oil distribution groove (305B), so that the outer cylinder oil suction groove (302B), the inner cylinder middle oil suction groove (301B), the right oil suction window (301F), the right oil distribution groove (305B), and the right chamber (309) constitute the right chamber oil suction passage; the left oil discharge window (301I) is connected to the left oil distribution groove (305A), so that the left outer cylinder oil discharge groove (302A), the inner cylinder left oil discharge groove (301A), the left oil discharge window (301I), the left oil distribution groove (305A), and the left chamber (307) constitute the left chamber oil discharge passage.

2. The motor-driven two-dimensional asymmetric hydraulic two-dimensional piston pump according to claim 1, characterized in that, The left outer cylinder oil drain groove (302A) of the outer cylinder (302) is connected to the left inner cylinder oil drain groove (301A) of the inner cylinder (301) through several ring-shaped left outer cylinder oil drain through holes (302D). The outer cylinder oil suction groove (302B) of the outer cylinder (302) is connected to the middle inner cylinder oil suction groove (301B) of the inner cylinder (301) through several ring-shaped outer cylinder oil suction through holes (302E). The right outer cylinder oil drain groove (302C) of the outer cylinder (302) is connected to the right inner cylinder oil drain groove (301C) of the inner cylinder (301) through several ring-shaped right outer cylinder oil drain through holes (302F).

3. The motor-driven two-dimensional asymmetric hydraulic two-dimensional piston pump according to claim 1, characterized in that, The inner cylinder (301) has a support sleeve (306) fixedly inserted into the inner wall of the right side, and the plunger (305) is slidably inserted into the support sleeve (306). The left cavity (307) is located between the right side of the support sleeve (306) and the left side of the boss (305C).

4. The motor-driven two-dimensional asymmetric hydraulic two-dimensional piston pump according to claim 1, characterized in that, A right plug (304) is inserted into the inner wall of the right end of the inner cylinder (301), and the right cavity (309) is located between the right side of the boss (305C) and the left side of the right plug (304).

5. The motor-driven two-dimensional asymmetric hydraulic two-dimensional piston pump according to claim 1, characterized in that, The motor module (1) includes a pump body housing (105), a motor (103), a coupling (106), and a shift fork (107). The pump body housing (105) is fixedly connected to the inner cylinder (301). The motor (103) is located inside the pump body housing (105). The coupling (106) is fixedly connected to the plunger (305). A turntable (108) is provided on the main shaft of the motor (103). The turntable (108) is connected to the left end of the shift fork (107), and the right end of the shift fork (107) is connected to the coupling (106). The shift fork (107) can drive the coupling (106) to rotate, and the coupling (106) can move axially relative to the shift fork (107).

6. A motor-driven two-dimensional asymmetric hydraulic two-dimensional piston pump according to claim 5, characterized in that, The coupling (106) is provided with a notch (106A), and the shift fork (107) is engaged with the notch (106A). The coupling (106) can slide axially on the shift fork (107) through the notch (106A).

7. A motor-driven two-dimensional asymmetric hydraulic two-dimensional piston pump according to claim 5, characterized in that, The motor module (1) also includes a left end cover (101), a connector (102), a bearing (104), a magnet (109), a left support (110), and a circuit board (111). The left end cover (101) is located on the left end of the pump body shell (105). The connector (102) is located on the pump body shell (105). The turntable (108) of the motor (103) is rotatably mounted to the pump body shell (105) through the bearing (104). The left support (110) is located on the left side of the motor (103) and is located between the left end cover (101) and the pump body shell (105). The circuit board (111) is located between the left end cover (101) and the left support (110). The magnet (109) is located on the left end of the main shaft of the motor (103).

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