Ultra-high pressure hydraulic pump

Abstract

The present invention relates to an ultra-high pressure hydraulic pump applied in the field of hydraulic pumps, comprising a main oil circuit axially penetrating the plug rod in a plug rod, an oil pressure groove on the outside of the plug rod, a pressure oil hole connecting the main oil circuit and the oil pressure groove on the plug rod, the inner diameter of the pressure oil hole is smaller than the inner diameter of the main oil circuit, a pressure-dividing oil circuit horizontal to the main oil circuit is provided on the side of the main oil circuit away from the pressure oil hole, pressure-dividing oil holes connected to the main oil circuit are provided at both ends of the pressure-dividing oil circuit, the inner diameter of one of the pressure-dividing oil holes is larger than the inner diameter of the pressure-dividing oil circuit and smaller than the inner diameter of the pressure oil hole, and the inner diameter of the other pressure-dividing oil hole is equal to the inner diameter of the pressure-dividing oil circuit, and the above-mentioned structures such as the pressure oil hole, the oil pressure groove, the pressure-dividing oil hole and the pressure-dividing oil circuit are adopted to divert the oil in the main oil circuit twice and balance the pressure, thereby reducing the pressure of the oil pressure on the plug rod in the process of increasing the hydraulic pressure, thereby reducing the failure rate of the plug rod and extending the service life of the ultra-high pressure hydraulic pump.

Description

Technical Field

[0001] The present invention relates to a hydraulic pump, and in particular to an ultra-high pressure hydraulic pump applied in the field of hydraulic pumps. Background Art

[0002] With the development of society and the continuous advancement of technology, hydraulic transmission technology has become more and more well-known, and its application areas have gradually developed from traditional heavy industry to light industry. Compared with traditional mechanical transmission, hydraulic transmission has the following advantages: large mass-power ratio, flexible connection, wide transmission range, flexible layout of hydraulic components, good impact resistance, easy control, etc. It is currently mainly used in the engineering field.

[0003] In large-scale forging equipment, marine machinery, and full-section tunneling machinery, in order to ensure the normal operation of the equipment, the hydraulic pump needs to provide a large amount of high-pressure oil. It is difficult for a traditional single hydraulic pump to achieve high-pressure and high-flow output. In order for the equipment to operate normally, the prime mover needs to drive multiple hydraulic pumps to work simultaneously, and auxiliary components such as accumulators and superchargers are used to achieve high-pressure and high-flow output.

[0004] The specification of Chinese patent CN211397784U discloses an ultra-high pressure hydraulic pump with high volumetric efficiency and large flow rate, including a cylinder body, a plunger, a swash plate, a sliding shoe, a transmission shaft, and a distribution plate; a plurality of plunger cavities are evenly distributed axially in the cylinder body, the plunger is installed in the plunger cavity, the plunger is connected to the sliding shoe through a plunger ball head, a swash plate is arranged on the sliding shoe and the sliding shoe rotates on the swash plate; a transmission shaft cavity is arranged in the axial center of the cylinder body, the transmission shaft is arranged in the transmission shaft cavity, the cylinder body and the transmission shaft are connected through a group of splines parallel to the transmission shaft, and one end of the transmission shaft is connected to an external power device; a distribution plate is fixedly installed on the end face of the cylinder body facing the opposite direction of the swash plate, and the ultra-high pressure hydraulic pump with high volumetric efficiency and large flow rate has high rigidity of the overall structure, meets the strength requirements under ultra-high pressure working conditions, is wear-resistant and wear-resistant, has a long service life, and has high volumetric efficiency, large flow rate, and has broad application prospects.

[0005] It should be noted that as the volumetric efficiency of ultra-high pressure hydraulic pumps increases and the flow rate increases, the existing plunger will bear greater pressure. However, since the existing plunger does not have a better structure to balance the pressure, it is prone to fatigue damage due to excessive internal oil pressure. When it is severely corroded, it is prone to leakage, etc., causing the entire ultra-high pressure hydraulic pump to lose its function, and improvement is urgently needed. Summary of the invention

[0006] In view of the above-mentioned prior art, the technical problem to be solved by the present invention is how to design a plug with a better balanced pressure structure, and to provide an ultra-high pressure hydraulic pump with a longer service life having the plug.

[0007] In order to solve the above problems, the present invention provides an ultra-high pressure hydraulic pump, comprising a housing, an input shaft, a swash plate support and a cam swash plate are installed in the housing, a cylinder bearing is installed at the front end of the swash plate support, a retaining plate fixed to the front end of the swash plate support is installed inside the cylinder bearing, and a main shaft and a plug are installed at the front end of the retaining plate;

[0008] A main oil passage axially penetrating the plug is provided in the plug, an oil pressure groove is provided on the outside of the plug, and a pressure oil hole connecting the main oil passage and the oil pressure groove is provided on the plug, wherein the inner diameter of the pressure oil hole is smaller than the inner diameter of the main oil passage;

[0009] A pressure-dividing oil circuit is provided on one side of the main oil circuit away from the pressure oil hole and is horizontal to the main oil circuit. Pressure-dividing oil holes connected to the main oil circuit are provided at both ends of the pressure-dividing oil circuit. The inner diameter of one of the pressure-dividing oil holes is larger than the inner diameter of the pressure-dividing oil circuit and smaller than the inner diameter of the pressure oil hole, and the inner diameter of the other pressure-dividing oil hole is equal to the inner diameter of the pressure-dividing oil circuit.

[0010] In the above ultra-high pressure hydraulic pump, a pressure oil hole is provided in the plug to divert the oil in the main oil circuit, so that part of the oil enters the oil pressure groove through the pressure oil hole, thereby achieving a primary pressure balance;

[0011] The oil in the main oil circuit is secondary diverted through the pressure oil hole, so that part of the oil is secondary diverted before entering the oil pressure groove through the pressure oil hole, thereby achieving secondary pressure balance. At the same time, the oil in the main oil circuit can flow radially outward and radially backflow in this section, thereby utilizing the flow of the oil itself to interfere with the axial and radial pressure generated by the oil on the plug;

[0012] In this way, the oil in the main oil circuit is divided twice and the pressure is balanced, thereby reducing the pressure of the oil pressure on the plug during the process of increasing the hydraulic pressure, reducing the failure rate of the plug, and extending the service life of the ultra-high pressure hydraulic pump.

[0013] As a further supplement to the present application, a pressure dividing oil hole with an inner diameter larger than that of the pressure dividing oil circuit is located at one end of the pressure dividing oil circuit close to the pressure oil hole, and a pressure dividing oil hole with an inner diameter equal to that of the pressure dividing oil circuit is located at the other end of the pressure dividing oil circuit.

[0014] The inner diameter of the pressure-dividing oil hole at one end of the pressure-dividing oil circuit near the pressure oil hole is larger, and the inner diameter of the pressure-dividing oil hole at the other end is smaller, which can facilitate the extraction of oil near the pressure oil hole, play a role of pre-balancing pressure within the range of pressure changes, and be discharged from a position far away from the pressure oil hole, which can effectively form a circulating flow effect and will not cause a significant impact on the flow of oil, reduce the pressure energy loss of oil, reduce the impact of the balance pressure on the pressure energy of oil, and ensure that the pressurization performance of the ultra-high pressure hydraulic pump is not affected.

[0015] As a further supplement to the present application, the pressure-dividing oil hole is a conical hole with a smaller opening inner diameter. The opening inner diameter of the pressure-dividing oil hole and the pressure-dividing oil circuit is larger than the opening inner diameter of the pressure-dividing oil hole and the main oil circuit, which is conducive to drawing the oil out of the main oil circuit and achieving the circulation effect of the oil in this section.

[0016] As another improvement of the present application, a spherical vortex groove is provided at the connection point between the pressure-dividing oil hole and the pressure-dividing oil circuit, and the vortex groove is located outside the connection point between the pressure-dividing oil hole and the pressure-dividing oil circuit.

[0017] When the oil with high pressure passes through the vortex groove, the pressure will be released, thereby reducing the impact pressure of the oil on the connection point between the pressure-dividing oil hole and the pressure-dividing oil circuit. At the same time, the oil can generate swirl along the vortex groove during the switching process, reducing the impact of the bend on the potential energy of the oil.

[0018] As another improvement supplement to the present application, the inner diameter of the vortex groove corresponding to the pressure-dividing oil hole whose inner diameter is larger than that of the pressure-dividing oil circuit is larger than the inner diameter of the pressure-dividing oil hole, and the inner diameter of the vortex groove corresponding to the pressure-dividing oil hole whose inner diameter is equal to that of the pressure-dividing oil circuit is larger than the inner diameter of the pressure-dividing oil circuit.

[0019] As another improvement of the present application, a plurality of spherical secondary pressure dividing grooves are opened in the middle part of the pressure dividing oil circuit, the plurality of secondary pressure dividing grooves are evenly distributed along the pressure dividing oil circuit, the inner diameter of the secondary pressure dividing grooves is larger than the inner diameter of the pressure dividing oil circuit, and the total volume of the plurality of secondary pressure dividing grooves is smaller than the volume of the pressure dividing oil circuit.

[0020] The oil flowing through the secondary pressure-dividing groove is depressurized and pressurized again, thereby sharing the pressure of the oil on the pressure-dividing oil circuit, achieving the effect of balancing the pressure again, reducing the pressure in the pressure-dividing oil circuit, and finally reducing the pressure load generated by the oil on the pressure-dividing oil circuit, ensuring that the pressure-dividing oil circuit can effectively play a good pressure-balancing role for a long time.

[0021] As another improvement of the present application, a diverter hole is further opened on the side of the main oil circuit close to the pressure-dividing oil circuit. There are multiple diverter holes corresponding one-to-one to multiple secondary pressure-dividing grooves, and the secondary pressure-dividing grooves are connected to the main oil circuit through the diverter holes.

[0022] The setting of the diversion holes produces more diversion points, which can further balance the pressure of the oil in the axial and radial directions, so that the pressure of the oil section passing through this section can tend to be the same, thereby producing a better pressure balancing effect.

[0023] As a further supplement to the present application, it also includes a variable blade, a flow control groove and a piston cylinder body, wherein the variable blade is arranged on one side of the swash plate support and cooperates with the flow control groove to control the flow of the oil, the flow control groove is arranged on the cam swash plate, the piston cylinder body is sleeved on the outside of the main shaft and the plug, and one end of the piston cylinder body is fixed to the retaining plate;

[0024] An oil distribution plate is fixed at the front end of the piston cylinder body, one end of the main shaft movably passes through the piston cylinder body and is connected to an auxiliary pump through a connecting shaft. Two oil ports for inputting and outputting oil are provided at the end of the shell body away from the input shaft, and a bushing corresponding to the position of the pressure oil hole is also provided on the outside of the plug.

[0025] In summary, by opening a pressure oil hole in the plug, the oil in the main oil circuit is diverted once, so that part of the oil enters the oil pressure groove through the pressure oil hole, thereby achieving a primary pressure balance;

[0026] The oil in the main oil circuit is secondary diverted through the pressure oil hole, so that part of the oil is secondary diverted before entering the oil pressure groove through the pressure oil hole, thereby achieving secondary pressure balance. At the same time, the oil in the main oil circuit can flow radially outward and radially backflow in this section, thereby utilizing the flow of the oil itself to interfere with the axial and radial pressure generated by the oil on the plug;

[0027] The inner diameter of the pressure-dividing oil hole at one end of the pressure-dividing oil circuit close to the pressure oil hole is larger, and the inner diameter of the pressure-dividing oil hole at the other end is smaller, which can facilitate the extraction of oil near the pressure oil hole, play a role of pre-balancing pressure within the range of pressure changes, and be discharged from a position far away from the pressure oil hole, which can effectively form a circulating flow effect, and will not cause a significant impact on the flow of oil, reduce the pressure energy loss of oil, reduce the impact of the balance pressure on the pressure energy of oil, and ensure that the pressurization performance of the ultra-high pressure hydraulic pump is not affected;

[0028] In this way, the oil in the main oil circuit is divided twice and the pressure is balanced, thereby reducing the pressure of the oil pressure on the plug during the process of increasing the hydraulic pressure, reducing the failure rate of the plug, and extending the service life of the ultra-high pressure hydraulic pump. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 This is a schematic diagram of the overall three-dimensional structure of the first embodiment of the present application;

[0030] Figure 2 This is a schematic diagram of the three-dimensional structure of the first embodiment of the present application when the shell is cut open;

[0031] Figure 3 This is a partial structural exploded diagram of the first embodiment of the present application;

[0032] Figure 4 This is a cross-sectional view of the plug according to the first embodiment of the present application;

[0033] Figure 5 This is a cross-sectional view of the plug according to the second embodiment of the present application;

[0034] Figure 6 This is a cross-sectional view of the plug according to the third embodiment of the present application;

[0035] Figure 7 This is a cross-sectional view of the plug according to the fourth embodiment of the present application;

[0036] Figure 8 for Figure 7 A magnified view of the structure in the middle.

[0037] Description of the numbers in the figure:

[0038] 1. Housing; 2. Input shaft; 3. Swash plate support; 4. Cam swash plate; 5. Variable blade; 6. Flow control groove; 7. Cylinder bearing; 8. Retaining plate; 9. Main shaft; 10. Piston cylinder; 11. Oil port; 12. Oil distribution plate; 13. Auxiliary pump; 14. Plug; 141. Main oil circuit; 142. Pressure oil hole; 143. Oil pressure groove; 144. Diverter hole; 145. Pressure-dividing oil circuit; 146. Pressure-dividing oil hole; 147. Eddy current groove; 148. Secondary pressure-dividing groove; 15. Bushing. DETAILED DESCRIPTION

[0039] The following is a detailed description of four implementation methods of the present application in conjunction with the accompanying drawings.

[0040] The first implementation method:

[0041] The present invention provides an ultra-high pressure hydraulic pump, see Figure 1-Figure 4 , comprising a housing 1, an input shaft 2, a swash plate support 3 and a cam swash plate 4 are installed in the housing 1, a cylinder bearing 7 is installed at the front end of the swash plate support 3, a retaining plate 8 fixed to the front end of the swash plate support 3 is installed inside the cylinder bearing 7, and a main shaft 9 and a plug 14 are installed at the front end of the retaining plate 8;

[0042] A main oil passage 141 axially penetrating the plug 14 is provided in the plug 14, an oil pressure groove 143 is provided on the outside of the plug 14, and a pressure oil hole 142 connecting the main oil passage 141 and the oil pressure groove 143 is provided on the plug 14. The inner diameter of the pressure oil hole 142 is smaller than the inner diameter of the main oil passage 141.

[0043] A pressure-dividing oil circuit 145 is provided on one side of the main oil circuit 141 away from the pressure oil hole 142 and is horizontal to the main oil circuit 141. Pressure-dividing oil holes 146 connected to the main oil circuit 141 are provided at both ends of the pressure-dividing oil circuit 145. The inner diameter of one of the pressure-dividing oil holes 146 is larger than the inner diameter of the pressure-dividing oil circuit 145 and smaller than the inner diameter of the pressure oil hole 142, and the inner diameter of the other pressure-dividing oil hole 146 is equal to the inner diameter of the pressure-dividing oil circuit 145.

[0044] Based on the above structure, the oil in the main oil circuit 141 is diverted once by opening a pressure oil hole 142 in the plug 14, so that part of the oil enters the oil pressure groove 143 through the pressure oil hole 142, thereby achieving a primary pressure balance;

[0045] The oil in the main oil circuit 141 is secondary-divided through the pressure oil hole 146, so that part of the oil is secondary-divided before entering the oil pressure groove 143 through the pressure oil hole 142, thereby achieving secondary pressure balance, and at the same time, the oil in the main oil circuit 141 can flow radially outward and radially backflow in this section, thereby utilizing the flow of the oil itself to interfere with the axial and radial pressure generated by the oil on the plug 14;

[0046] In this way, the oil in the main oil circuit 141 is divided twice and the pressure is balanced, thereby reducing the pressure of the oil pressure on the plug 14 during the process of increasing the hydraulic pressure, reducing the failure rate of the plug 14, and extending the service life of the ultra-high pressure hydraulic pump.

[0047] Figure 2-Figure 3 The figure shows that it also includes a variable blade 5, a flow control groove 6 and a piston cylinder 10. The variable blade 5 is arranged on one side of the swash plate support 3 and cooperates with the flow control groove 6 to control the flow of the oil. The flow control groove 6 is opened on the cam swash plate 4. The piston cylinder 10 is sleeved on the outside of the main shaft 9 and the plug 14. One end of the piston cylinder 10 is fixed to the retaining plate 8.

[0048] An oil distribution plate 12 is fixed to the front end of the piston cylinder body 10, one end of the main shaft 9 movably passes through the piston cylinder body 10 and is connected to an auxiliary pump 13 through a connecting shaft, and two oil ports 11 for inputting and outputting oil are provided at the end of the housing 1 away from the input shaft 2, and a bushing 15 corresponding to the position of the pressure oil hole 142 is also provided on the outside of the plug 14.

[0049] Figure 4 It is shown that the pressure dividing oil hole 146 having an inner diameter larger than that of the pressure dividing oil circuit 145 is located at one end of the pressure dividing oil circuit 145 close to the pressure oil hole 142, and the pressure dividing oil hole 146 having an inner diameter equal to that of the pressure dividing oil circuit 145 is located at the other end of the pressure dividing oil circuit 145;

[0050] The pressure-dividing oil hole 146 is a conical hole with a smaller opening inner diameter (not shown in the figure). The opening inner diameter of the pressure-dividing oil hole 146 connecting with the pressure-dividing oil circuit 145 is larger than the opening inner diameter of the pressure-dividing oil hole 146 connecting with the main oil circuit 141, which is beneficial for drawing the oil out of the main oil circuit 141 and realizing the circulation effect of the oil in this section.

[0051] The inner diameter of the pressure-dividing oil hole 146 at one end of the pressure-dividing oil circuit 145 near the pressure oil hole 142 is larger, and the inner diameter of the pressure-dividing oil hole 146 at the other end is smaller, which can facilitate the extraction of oil near the pressure oil hole 142, play a role of pre-balancing pressure within the range of pressure changes, and be discharged from a position far away from the pressure oil hole 142, which can effectively form a circulating flow effect and will not cause a significant impact on the flow of oil, reduce the pressure energy loss of oil, reduce the influence of the balance pressure on the pressure energy of oil, and ensure that the pressurization performance of the ultra-high pressure hydraulic pump is not affected.

[0052] Second implementation method:

[0053] Figure 5 It is shown that a spherical vortex groove 147 is provided at the connection point between the pressure-dividing oil hole 146 and the pressure-dividing oil circuit 145, and the vortex groove 147 is located outside the connection point between the pressure-dividing oil hole 146 and the pressure-dividing oil circuit 145;

[0054] The inner diameter of the vortex groove 147 corresponding to the pressure-dividing oil hole 146 whose inner diameter is larger than that of the pressure-dividing oil circuit 145 is larger than the inner diameter of the pressure-dividing oil hole 146 , and the inner diameter of the vortex groove 147 corresponding to the pressure-dividing oil hole 146 whose inner diameter is equal to that of the pressure-dividing oil circuit 145 is larger than the inner diameter of the pressure-dividing oil circuit 145 .

[0055] The oil with high pressure will be depressurized when passing through the vortex groove 147, thereby reducing the impact pressure of the oil on the connection point between the pressure-dividing oil hole 146 and the pressure-dividing oil circuit 145, and at the same time, the oil can generate a swirl along the vortex groove 147 during the switching process, reducing the impact of the bend on the potential energy of the oil.

[0056] The third implementation method:

[0057] Figure 6 It is shown that a plurality of spherical secondary pressure dividing grooves 148 are opened in the middle of the pressure dividing oil circuit 145 , and the plurality of secondary pressure dividing grooves 148 are evenly distributed along the pressure dividing oil circuit 145 . The inner diameter of the secondary pressure dividing grooves 148 is larger than the inner diameter of the pressure dividing oil circuit 145 , and the total volume of the plurality of secondary pressure dividing grooves 148 is smaller than the volume of the pressure dividing oil circuit 145 .

[0058] The oil flowing through the secondary pressure-dividing groove 148 is depressurized and pressurized again, thereby sharing the pressure of the oil on the pressure-dividing oil circuit 145, achieving the effect of balancing the pressure again, reducing the pressure in the pressure-dividing oil circuit 145, and finally reducing the pressure load generated by the oil on the pressure-dividing oil circuit 145, ensuring that the pressure-dividing oil circuit 145 can effectively play a good pressure-balancing role for a long time.

[0059] The fourth implementation method:

[0060] Figure 7-Figure 8 It is shown that a diverter hole 144 is further provided on one side of the main oil circuit 141 close to the pressure dividing oil circuit 145 . A plurality of diverter holes 144 are provided and correspond one-to-one to a plurality of secondary pressure dividing grooves 148 . The secondary pressure dividing grooves 148 are connected to the main oil circuit 141 through the diverter holes 144 .

[0061] The provision of the diversion holes 144 creates more diversion points, thereby further balancing the pressure of the oil in the axial and radial directions, so that the pressure of the cross section of the oil passing through this section can tend to be the same, thereby producing a better pressure balancing effect.

[0062] In view of current practical needs, the above-mentioned implementation mode adopted in this application is not limited to the scope of protection. Various changes made within the knowledge scope of technical personnel in this field without departing from the concept of this application still fall within the scope of protection of the present invention.

Claims

1. An ultra-high pressure hydraulic pump, comprising a housing (1), an input shaft (2), a swash plate support (3) and a cam swash plate (4) being mounted in the housing (1), a cylinder bearing (7) being mounted at the front end of the swash plate support (3), a retaining plate (8) being mounted inside the cylinder bearing (7) and being fixed to the front end of the swash plate support (3), a main shaft (9) and a plunger (14) being mounted at the front end of the retaining plate (8), characterized in that: The plug rod (14) is provided with a main oil passage (141) axially penetrating the plug rod (14), an oil pressure groove (143) is provided on the outside of the plug rod (14), and the plug rod (14) is also provided with a pressure oil hole (142) connecting the main oil passage (141) and the oil pressure groove (143), wherein the inner diameter of the pressure oil hole (142) is smaller than the inner diameter of the main oil passage (141); A pressure-dividing oil circuit (145) is provided on one side of the main oil circuit (141) away from the pressure oil hole (142), and is horizontal to the main oil circuit (141); pressure-dividing oil holes (146) communicating with the main oil circuit (141) are provided at both ends of the pressure-dividing oil circuit (145); the inner diameter of one of the pressure-dividing oil holes (146) is larger than the inner diameter of the pressure-dividing oil circuit (145) and smaller than the inner diameter of the pressure oil hole (142); and the inner diameter of the other pressure-dividing oil hole (146) is equal to the inner diameter of the pressure-dividing oil circuit (145); The pressure dividing oil hole (146) having an inner diameter greater than that of the pressure dividing oil circuit (145) is located at one end of the pressure dividing oil circuit (145) close to the pressure oil hole (142), and the pressure dividing oil hole (146) having an inner diameter equal to that of the pressure dividing oil circuit (145) is located at the other end of the pressure dividing oil circuit (145).

2. An ultra-high pressure hydraulic pump according to claim 1, characterized in that: The pressure-dividing oil hole (146) is a tapered hole with a relatively small opening inner diameter, and the opening inner diameter at the point where the pressure-dividing oil hole (146) is connected to the pressure-dividing oil circuit (145) is larger than the opening inner diameter at the point where the pressure-dividing oil hole (146) is connected to the main oil circuit (141).

3. The ultra-high pressure hydraulic pump according to claim 1, characterized in that: A spherical vortex groove (147) is provided at the connection point between the pressure-dividing oil hole (146) and the pressure-dividing oil circuit (145); the vortex groove (147) is located outside the connection point between the pressure-dividing oil hole (146) and the pressure-dividing oil circuit (145).

4. An ultra-high pressure hydraulic pump according to claim 3, characterized in that: The inner diameter of the vortex groove (147) corresponding to the pressure dividing oil hole (146) having an inner diameter larger than that of the pressure dividing oil circuit (145) is larger than the inner diameter of the pressure dividing oil hole (146), and the inner diameter of the vortex groove (147) corresponding to the pressure dividing oil hole (146) having an inner diameter equal to that of the pressure dividing oil circuit (145) is larger than the inner diameter of the pressure dividing oil circuit (145).

5. The ultra-high pressure hydraulic pump according to claim 1, characterized in that: A plurality of spherical secondary pressure dividing grooves (148) are provided in the middle of the pressure dividing oil circuit (145); the plurality of secondary pressure dividing grooves (148) are evenly distributed along the pressure dividing oil circuit (145); the inner diameter of the secondary pressure dividing grooves (148) is larger than the inner diameter of the pressure dividing oil circuit (145); and the total volume of the plurality of secondary pressure dividing grooves (148) is smaller than the volume of the pressure dividing oil circuit (145).

6. The ultra-high pressure hydraulic pump according to claim 5, characterized in that: A flow dividing hole (144) is also provided on one side of the main oil circuit (141) close to the pressure dividing oil circuit (145). A plurality of flow dividing holes (144) are provided and correspond one to one with a plurality of secondary pressure dividing grooves (148). The secondary pressure dividing grooves (148) are connected to the main oil circuit (141) via the flow dividing holes (144).

7. An ultra-high pressure hydraulic pump according to any one of claims 1 to 6, characterized in that: It also includes a variable blade (5), a flow control groove (6) and a piston cylinder (10), wherein the variable blade (5) is arranged on one side of the swash plate support (3) and cooperates with the flow control groove (6) to control the flow of oil, the flow control groove (6) is opened on the cam swash plate (4), the piston cylinder (10) is sleeved on the outside of the main shaft (9) and the piston rod (14), and one end of the piston cylinder (10) is fixed to the retaining plate (8); An oil distribution plate (12) is fixed to the front end of the piston cylinder (10); one end of the main shaft (9) movably passes through the piston cylinder (10) and is connected to an auxiliary pump (13) via a connecting shaft; an end of the housing (1) away from the input shaft (2) is provided with two oil ports (11) for inputting oil and outputting oil respectively; and a bushing (15) corresponding to the position of the pressure oil hole (142) is also sleeved on the outside of the piston rod (14).

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