A high-pressure gear pump and its installation and working method

Abstract

The present invention discloses a high-pressure gear pump and its installation and operating method. The gear pump includes a pump housing, a pair of externally meshing gears disposed within the pump housing, wherein the gear heights of the two gears are equal. A low-pressure oil pump area is located on one side of the pump housing near the pair of externally meshing gears, while a high-pressure oil pump area is located on the other side of the pair of externally meshing gears. A radial clearance compensation block is disposed within the low-pressure oil pump area, and an elastic element is disposed between the radial clearance compensation block and the pump housing. One end of the elastic element contacts the wall of the pump housing, and the other end contacts the radial clearance compensation block. The elastic force of the elastic element constantly presses the radial clearance compensation block toward the pair of externally meshing gears. This high-pressure gear pump has the advantages of good low-speed performance, long service life, reduced radial force on the gear shaft, and high operating pressure of the gear pump.

Description

Technical Field

[0001] The invention relates to the technical field of gear pumps, and in particular discloses a high-pressure gear pump and an installation and working method thereof. Background Art

[0002] The existing high-pressure external gear pump uses a pair of external meshing gears to mesh. The transmission gear drives the slave gear to rotate. The volume on the side where the two teeth begin to mesh decreases, pressurizing the hydraulic oil and discharging it; while the volume on the side where the meshing teeth of the two gears begin to separate increases, the pressure decreases, and the hydraulic oil is sucked into the oil pump. In order to meet the high-pressure design, side plates are designed on both sides of the gear axis. The side plates play the role of compensating for the axial clearance of the gears, reducing leakage, and increasing the working pressure. In order to improve the performance of the oil pump, the new pump needs to be bored. The boring process is carried out after the new pump is assembled and tested at the factory. The boring process is that the two gears are pressed into the low-pressure chamber under high pressure and contact the low-pressure chamber of the pump casing. Through the rotation of the gears, they are ground against the wall of the pump casing in the low-pressure chamber. This ensures that the gap between the gears and the pump casing is small, the leakage is reduced, and the low-speed performance and volumetric efficiency of the oil pump are improved. Disadvantages of this design:

[0003] 1. The process of sweep boring produces a large amount of particles, which can easily cause poor assembly cleanliness and accelerate gear wear.

[0004] 2. Poor low-speed performance, low volumetric efficiency, and difficulty in designing high-pressure oil pumps.

[0005] 3. After each oil pump is bored at the factory, once it is disassembled, the wall of the low-pressure chamber of the pump casing cannot be bored again, which will cause a decrease in volumetric efficiency, especially a significant decrease in low-speed performance.

[0006] 4. The driven wheel is subjected to the combined force of driving force and hydraulic pressure, and the load acting on the shaft sleeve is large, which limits the high-pressure design of the gear pump.

[0007] Similar to Patent Document 1 (CN201865910U), this design utilizes two compensating floating shoes with fixed key pins and seals between the floating shoes and the pump body. This structure fails to build pressure between the floating shoes and the pump body at low speeds, resulting in significant leakage of the working medium and poor low-speed performance, making it unsuitable for servo hydraulic systems. Furthermore, even when high pressure is established at high speeds, the gears are still subject to radial forces from the hydraulic pressure, making high-pressure design difficult. This structure also places high demands on the seals between the floating shoes and the pump body. The seals experience high pressure across the front and rear surfaces, and the movement of the floating shoes accelerates seal wear. If the seals fail, the oil pump will be unable to build high pressure.

[0008] Patent reference 2 (CN206448942U) is a low-pressure gear pump with no sealing design between the pump body and the compensation plug-in. This structural oil pump is not easy to use as a high-pressure pump. Summary of the Invention

[0009] In response to the above technical problems, the present invention discloses a high-pressure gear pump and its installation and working method. The high-pressure gear pump has good low-speed performance, long service life, reduced radial force of the gear shaft, and higher working pressure of the gear pump.

[0010] In order to achieve the above technical objectives, the present invention adopts the following technical solutions:

[0011] A high-pressure gear pump, comprising:

[0012] The pump casing has a pair of external meshing gears provided therein, wherein the gear heights of the two gears are equal, one side of the pair of external meshing gears in the pump casing is the low-pressure area of ​​the oil pump, and the other side of the pair of external meshing gears is the high-pressure area of ​​the oil pump, and a radial clearance compensation block is provided in the low-pressure area of ​​the oil pump, and an elastic element is provided between the radial clearance compensation block and the pump casing, one end of the elastic element contacts the wall of the pump casing, and the other end contacts the radial clearance compensation block, and the elastic force of the elastic element always presses the radial clearance compensation block toward the pair of external meshing gears, and one side of the radial clearance compensation block at the junction with the external meshing gear has an arc surface adapted to the outer contour of the gear, and a high-pressure clearance cavity is formed between the radial clearance compensation block and the pump wall of the high-pressure gear pump, and the high-pressure clearance cavity is connected to the high-pressure area of ​​the oil pump.

[0013] The radial clearance compensation block has an arched structure. A positioning pin groove for connecting with a positioning pin is provided on the arc surface of the radial clearance compensation block adjacent to the pump housing, and two elastic element connecting grooves for connecting elastic elements are symmetrically arranged on both sides of the positioning pin groove. The positioning pin is used to limit the radial clearance compensation block from moving left and right as the gear rotates.

[0014] The arc surface on one side of the radial clearance compensation block of the arched structure where it connects with the gear is the sealing surface. When the oil pump runs, high pressure is established, and an oil film is formed between the radial clearance compensation block and the gear.

[0015] The elastic element is a spring leaf.

[0016] The radial clearance compensation block is made of copper alloy material, or steel with copper-tin-lead alloy sintered on the sealing surface, or steel with peek or PTFE material coated on the sealing surface.

[0017] A front end cover is provided on one side of the pump housing, a first axial clearance compensation plate is provided between the front end cover and the gear, and a first sealing gasket is provided between the first axial clearance compensation plate and the front end cover to separate the high-pressure area of ​​the oil pump and the low-pressure area of ​​the oil pump;

[0018] A rear end cover is provided on the other side of the pump housing, a second axial clearance compensation plate is provided between the rear end cover and the gear, and a second sealing gasket is used between the second axial clearance compensation plate and the rear end cover to separate the high-pressure area of ​​the oil pump and the low-pressure area of ​​the oil pump;

[0019] The first axial clearance compensation plate and the second axial clearance compensation plate have the same structure, and both include an axial clearance compensation plate body, and an oil inlet hole, an oil outlet, and a gear shaft hole provided on the axial clearance compensation plate body.

[0020] A silencer structure is further provided on the first axial clearance compensation plate and the second axial clearance compensation plate. The silencer structure includes a silencer groove provided at the bottom of the oil inlet hole and located between the two gear shaft holes. The silencer groove is used to prevent oil from being trapped when the two gears are engaged, thereby reducing pressure fluctuations in the high-pressure chamber.

[0021] In addition, two wedge-shaped oil channels are symmetrically arranged at the edges of both sides of the axial clearance compensation plate. The two wedge-shaped oil channels connect the volume chamber B between the high-pressure chamber C, the two gears and the radial clearance compensation block. As the gears rotate, the flow area between the two chambers gradually increases.

[0022] The volumes enclosed by the pump housing and the front and rear end covers are all high-pressure chambers;

[0023] The chamber surrounded by the first axial clearance compensation plate, the second axial clearance compensation plate, the driving gear, the driven gear and the radial clearance compensation block is a low-pressure chamber. The low-pressure medium enters from the oil inlet on the rear end cover, passes through the oil inlet channel on the rear end cover and the oil inlet on the second axial clearance compensation plate in sequence, and enters the low-pressure area surrounded by the radial clearance compensation block of the arched structure and the gear; the elastic force of the elastic element always presses the radial clearance compensation block toward a pair of externally meshing gears, and a high-pressure clearance chamber is formed between the radial clearance compensation block and the pump wall of the high-pressure gear pump. After the pressure is established, the radial clearance compensation block is further pressed toward the gear;

[0024] After the gears rotate and engage, the working medium with increased pressure flows out through the oil outlet on the second axial clearance compensation plate, and flows to the hydraulic system pump oil through the oil outlet channel and the oil outlet on the rear end cover in turn.

[0025] The present invention further discloses an installation method based on the high-pressure gear pump, comprising the following steps:

[0026] S1. First press the shaft sleeve into the front cover, insert the oil seal into the front cover, and install the retaining ring to prevent the oil seal from falling out;

[0027] S2. Install the sealing ring and the second sealing gasket into the front end cover;

[0028] S3. Put the pump casing into the front cover. The stopper on the front cover, which has the same shape as the inner cavity of the pump casing, serves as a positioning device.

[0029] S4, installing the first axial clearance compensation plate;

[0030] S5. Install a pair of external meshing gears;

[0031] S6. Install the radial clearance compensation block, insert the positioning pin into the matching pin hole of the radial clearance compensation block and the pump body, and install the elastic element between the radial clearance compensation block and the inner wall of the pump housing;

[0032] S7, installing the second axial clearance compensation plate;

[0033] S8. Install the sealing ring and the second sealing gasket into the rear end cover, and use grease to ensure that the two do not fall off the rear end cover; install the rear end cover into the pump housing, and the stopper on the rear end cover with the same shape as the pump housing chamber serves as a positioning function;

[0034] S9. Install 4 bolts and tighten them with the tightening torque. After assembly is completed, rotate the external gear to check whether it can rotate flexibly.

[0035] Beneficial effects:

[0036] Compared with the existing gear pump structure, the high-pressure gear pump of the present invention has the following advantages:

[0037] First, the design of the radial clearance compensation structure eliminates the need for pre-boring before the hydraulic pump leaves the factory, improving the product qualification rate and allowing the pump casing to be reused.

[0038] Second, the radial clearance compensation block of the external gear pump uses the spring force of the spring plate to always keep the gap between the high-pressure and low-pressure chambers relatively small, reducing low-speed leakage and improving low-speed pressure and volumetric efficiency.

[0039] Third, the high-pressure assembly consisting of the radial clearance compensation plate and gears is surrounded by high-pressure working medium. The radially balanced hydraulic pressure design reduces the load on the shaft sleeve from the gears, facilitating the high-pressure design of the external gear pump.

[0040] Fourth, external gear pumps use radial clearance compensation to achieve better low-speed performance, allowing external gear pumps to be used in the servo hydraulic field.

[0041] Fifth, the high-pressure design of the external gear pump can reduce the oil pump displacement while meeting the same system load. This reduces the size of the hydraulic valves and cylinders in the hydraulic system, reducing the volume and cost of the entire hydraulic system. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1 Schematic diagram of the structure of the high-pressure gear pump of the present invention;

[0043] Figure 2 for Figure 1 Side view of;

[0044] Figure 3 This is a schematic diagram of the structure of the radial clearance compensation block of the present invention;

[0045] Figure 4 This is a schematic diagram of the bottom structure of the radial clearance compensation block;

[0046] Figure 5 This is a schematic structural diagram of the axial clearance compensation plate of the present invention;

[0047] Figure 6 This is a schematic structural diagram of the oil inlet and outlet of the high-pressure gear pump of the present invention;

[0048] Figure 7 This is a schematic diagram of the oil pressure zones inside the pump chamber of the high-pressure gear pump of the present invention;

[0049] Among them, 1. front cover; 2. sealing ring; 3. pump housing; 4. locating pin; 5. radial clearance compensation block; 6. second axial clearance compensation plate; 7. second sealing gasket; 8. rear cover; 8.1. oil inlet on the rear cover; 8.2. oil inlet channel on the rear cover; 8.3. oil outlet channel on the rear cover; 8.4. oil outlet on the rear cover; 9. oil seal; 10. retaining ring; 11. bushing; 12. transmission gear; 13. driven gear; 14. spring sheet; 15. bolt; 16: oil pump high-pressure area; 17. oil pump low-pressure area; 18. high-pressure clearance cavity; 19. spring sheet groove; 20. locating pin groove; 21. sealing surface; 22. silencer groove; 23. gear shaft hole; 24. axial clearance compensation plate oil inlet hole; 25. axial clearance compensation plate oil outlet hole; 26. wedge-shaped oil channel; A. low-pressure area; B. transition area from low pressure to high pressure; C. high-pressure area. DETAILED DESCRIPTION

[0050] The technical solution of the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0051] A high-pressure gear pump, comprising:

[0052] The pump casing has a pair of external meshing gears provided therein, wherein the gear heights of the two gears are equal, one side of the pair of external meshing gears in the pump casing is the low-pressure area of ​​the oil pump, and the other side of the pair of external meshing gears is the high-pressure area of ​​the oil pump, and a radial clearance compensation block is provided in the low-pressure area of ​​the oil pump, and an elastic element is provided between the radial clearance compensation block and the pump casing, one end of the elastic element contacts the wall of the pump casing, and the other end contacts the radial clearance compensation block, and the elastic force of the elastic element always presses the radial clearance compensation block toward the pair of external meshing gears, and one side of the radial clearance compensation block at the junction with the external meshing gear has an arc surface adapted to the outer contour of the gear, and a high-pressure clearance cavity is formed between the radial clearance compensation block and the pump wall of the high-pressure gear pump, and the high-pressure clearance cavity is connected to the high-pressure area of ​​the oil pump.

[0053] A positioning pin is provided between the radial clearance compensation block and the pump housing to limit the radial clearance compensation block from moving left or right following the rotation of the gear. The radial clearance compensation block has an arched structure. A positioning pin groove for connecting with the positioning pin is provided on the arc surface of the radial clearance compensation block of the arched structure adjacent to the pump housing, and two elastic element connecting grooves for connecting the elastic element are symmetrically arranged on both sides of the positioning pin groove;

[0054] The arc surface on one side of the arched radial clearance compensation block where it meets the gear is the sealing surface. When the oil pump runs, high pressure is established and an oil film is formed between the radial clearance compensation block and the gear.

[0055] As a preferred technical solution of the present invention, the elastic element is a spring leaf.

[0056] As a preferred technical solution of the present invention, the radial clearance compensation block is made of copper alloy material.

[0057] As a preferred technical solution of the present invention, a front end cover is provided on one side of the pump housing, a first axial clearance compensation plate is provided between the front end cover and the gear, and a first sealing gasket is provided between the first axial clearance compensation plate and the front end cover to separate the high-pressure area of ​​the oil pump from the low-pressure area of ​​the oil pump;

[0058] A rear end cover is provided on the other side of the pump housing, a second axial clearance compensation plate is provided between the rear end cover and the gear, and a second sealing gasket is used between the second axial clearance compensation plate and the rear end cover to separate the high-pressure area of ​​the oil pump and the low-pressure area of ​​the oil pump;

[0059] The first axial clearance compensation plate and the second axial clearance compensation plate have the same structure, and both include an axial clearance compensation plate body, and an oil inlet hole, an oil outlet, and a gear shaft hole provided on the axial clearance compensation plate body.

[0060] As a preferred technical solution of the present invention, a silencer structure is provided on the first axial clearance compensation plate and the second axial clearance compensation plate. The silencer structure includes a silencer groove provided at the bottom of the oil inlet hole and located between the two gear shaft holes. The silencer groove is used to prevent oil from being trapped when the two gears are engaged, thereby reducing pressure fluctuations in the high-pressure chamber.

[0061] In addition, two wedge-shaped oil channels are symmetrically arranged at the edges of both sides of the axial clearance compensation plate. The two wedge-shaped oil channels connect the high-pressure chamber C and the volume chamber B between the two gears and the radial compensation plate. As the gears rotate, the flow area between the two chambers gradually increases, and the pressure oil in the high-pressure area of ​​C is gradually introduced into the chamber B, so that the pressure in the chamber B gradually increases as it rotates from the low-pressure area to the high-pressure area, ensuring the smoothness of the pressure establishment, reducing pressure fluctuations, and reducing noise.

[0062] The installation method of the high-pressure gear pump of the present invention comprises the following steps:

[0063] S1. First press the shaft sleeve into the front cover, insert the oil seal into the front cover, and install the retaining ring to prevent the oil seal from falling out;

[0064] S2. Install the sealing ring and the second sealing gasket into the front end cover;

[0065] S3. Put the pump casing into the front cover. The stopper on the front cover, which has the same shape as the inner cavity of the pump casing, serves as a positioning device.

[0066] S4, installing the first axial clearance compensation plate;

[0067] S5. Install a pair of external meshing gears;

[0068] S6. Install the radial clearance compensation block, insert the positioning pin into the matching pin hole of the radial clearance compensation block and the pump body, and install the elastic element between the radial clearance compensation block and the inner wall of the pump housing;

[0069] S7, installing the second axial clearance compensation plate;

[0070] S8. Install the sealing ring and the second sealing gasket into the rear end cover, and use grease to ensure that the two do not fall off the rear end cover; install the rear end cover into the pump housing, and the stopper on the rear end cover with the same shape as the pump housing chamber serves as a positioning function;

[0071] S9. Install 4 bolts and tighten them with the tightening torque. After assembly is completed, rotate the external gear to check whether it can rotate flexibly.

[0072] The working method of the high-pressure gear pump of the present invention, the volume enclosed by the pump housing and the front and rear end covers is a high-pressure chamber;

[0073] The chamber enclosed by the first axial clearance compensation plate, the second axial clearance compensation plate, the driving gear, the driven gear, and the radial clearance compensation block constitutes a low-pressure chamber. Low-pressure medium enters through the oil inlet port on the rear end cover, passes sequentially through the oil inlet passage 8.2 on the rear end cover, and the oil inlet port on the second axial clearance compensation plate, and enters the low-pressure zone enclosed by the arched radial clearance compensation block and the gears. The spring force of the spring sheet constantly presses the radial clearance compensation block toward the pair of externally meshing gears. In addition, a high-pressure clearance chamber is provided between the radial clearance compensation block and the pump wall of the low-pressure zone of the oil pump. Once pressure builds up, the radial clearance compensation block is further pressed toward the gears.

[0074] After the gears rotate and mesh, the working medium with increased pressure flows out through the oil outlet on the first axial clearance compensation plate, and flows to the hydraulic system pump oil through the oil outlet channel 8.3 and the oil outlet 8.4 on the rear end cover in turn. Example

[0075] like Figure 1As shown, the radial clearance compensation block is designed on the low-pressure side of the gear mesh, between the gear and the pump housing 3. Two spring mounting slots are symmetrically designed on one side between the radial clearance compensation block 5 and the pump housing 3. Spring plates are installed in these slots. One end of the spring plate 14 contacts the wall of the pump housing 3, and the other end contacts the radial clearance compensation block 5. The spring force constantly presses the radial clearance compensation block 5 toward the gear, reducing the gap between the gear and the radial clearance compensation block 5 and minimizing leakage.

[0076] The gap 18 between the radial clearance compensation block 5 and the pump housing 3 is designed as a high-pressure chamber. After the pressure is built up, the compensation plate is further pressed toward the gear.

[0077] The radial clearance compensation block 5 is fixed by the positioning pin 4, which limits the radial clearance compensation block 5 from moving left and right following the rotation of the gear.

[0078] There are two axial clearance compensation plates, one on each side. Seals 7 separate the high-pressure and low-pressure zones between the plates and the front and rear end covers. The hydraulic pressure in the high-pressure zone presses the plates against the sides of the gears, reducing the gap between the gears and the plates, thereby minimizing leakage. The plates also feature a silencer groove 22 to prevent oil from being trapped in the gear meshing area and a silencer groove 26 to ensure a smooth transition from low pressure to high pressure on the gears. This minimizes internal pump pressure fluctuations and reduces pump noise. The plates are also equipped with oil inlet and outlet ports.

[0079] The volumes enclosed by the pump casing and the front and rear end covers of the gear pump structure of the present invention are all high-pressure chambers, and the chamber enclosed by the axial clearance compensation plate, the driving gear, the driven gear and the radial clearance compensation block is a low-pressure chamber. The low-pressure medium enters through the oil inlet 8.1 on the rear end cover 8, passes through the oil inlet channel 8.2 on the rear end cover, and enters the low-pressure area 17 enclosed by the radial clearance compensation block 5 and the gear through the oil inlet of the second axial clearance compensation plate; after the gears rotate and engage, the working medium with increased pressure flows out through the oil outlet of the second axial clearance compensation plate, and is pumped into the hydraulic system through the oil outlet 8.3 and oil outlet channel 8.4 of the rear end cover.

[0080] like Figure 7 Among them, area A is the low-pressure area, which is surrounded by two gears and the radial clearance compensation block; area C is the high-pressure area, which is composed of the area surrounded by two gears and the pump body wall and the gap between the pump body and the radial compensation block; area B is the transition area from low pressure to high pressure, which is the area surrounded by two teeth of the gear and the radial clearance compensation block. The pressure in area B rotates with the rotation of the gear. Under the action of the silencer groove 26 on the axial clearance compensation plate, the pressure gradually increases with the rotation of area B, so that the internal pressure of the oil pump transitions smoothly, reducing the internal pressure fluctuation of the oil pump.

Claims

1. A high-pressure gear pump comprising: The pump casing comprises a pair of external meshing gears, wherein the gear heights of the two gears are equal, one side of the pair of external meshing gears in the pump casing is a low-pressure area of ​​the oil pump, and the other side of the pair of external meshing gears is a high-pressure area of ​​the oil pump, and the characteristic is that a radial clearance compensation block is provided in the low-pressure area of ​​the oil pump, an elastic element is provided between the radial clearance compensation block and the pump casing, one end of the elastic element contacts the wall surface of the pump casing, and the other end contacts the radial clearance compensation block, the elastic force of the elastic element always presses the radial clearance compensation block toward the pair of external meshing gears, the side of the radial clearance compensation block in contact with the external meshing gear has an arc surface adapted to the outer contour of the gear, a high-pressure clearance cavity is formed between the radial clearance compensation block and the pump wall of the high-pressure gear pump, and the high-pressure clearance cavity is connected with the high-pressure area of ​​the oil pump; The radial clearance compensation block has an arched structure. A positioning pin groove for connecting with a positioning pin is provided on the arc surface of the radial clearance compensation block adjacent to the pump housing, and two elastic element connecting grooves for connecting elastic elements are symmetrically arranged on both sides of the positioning pin groove. The positioning pin is used to limit the radial clearance compensation block from moving left and right as the gear rotates. The arc surface on one side of the arched radial clearance compensation block that contacts the gear is the sealing surface. When the oil pump runs, it creates high pressure and forms an oil film between the radial clearance compensation block and the gear. The elastic element is a spring leaf.

2. The high-pressure gear pump according to claim 1, characterized in that The radial clearance compensation block is made of copper alloy material, or steel with copper-tin-lead alloy sintered on the sealing surface, or steel with peek or PTFE material coated on the sealing surface.

3. The high-pressure gear pump according to claim 1, characterized in that A front end cover is provided on one side of the pump housing, a first axial clearance compensation plate is provided between the front end cover and the gear, and a first sealing gasket is provided between the first axial clearance compensation plate and the front end cover to separate the high-pressure area of ​​the oil pump and the low-pressure area of ​​the oil pump; A rear end cover is provided on the other side of the pump housing, a second axial clearance compensation plate is provided between the rear end cover and the gear, and a second sealing gasket is used between the second axial clearance compensation plate and the rear end cover to separate the high-pressure area of ​​the oil pump and the low-pressure area of ​​the oil pump; The first axial clearance compensation plate and the second axial clearance compensation plate have the same structure, and both include an axial clearance compensation plate body, and an oil inlet hole, an oil outlet, and a gear shaft hole provided on the axial clearance compensation plate body.

4. The high-pressure gear pump according to claim 3, characterized in that A silencer structure is further provided on the first axial clearance compensation plate and the second axial clearance compensation plate. The silencer structure includes a silencer groove provided at the bottom of the oil inlet hole and located between the two gear shaft holes. The silencer groove is used to prevent oil from being trapped when the two gears are engaged, thereby reducing pressure fluctuations in the high-pressure chamber. In addition, two wedge-shaped oil passages are symmetrically arranged at the edges of both sides of the axial clearance compensation plate. The two wedge-shaped oil passages are used to ensure the smoothness of pressure establishment, reduce pressure fluctuations, and reduce noise.

5. The operating method of the high-pressure gear pump according to claim 3 or 4, characterized in that: The volumes enclosed by the pump housing and the front and rear end covers are all high-pressure chambers; The chamber surrounded by the first axial clearance compensation plate, the second axial clearance compensation plate, the driving gear, the driven gear and the radial clearance compensation block is a low-pressure chamber. The low-pressure medium enters from the oil inlet on the rear end cover, passes through the oil inlet channel on the rear end cover and the oil inlet on the second axial clearance compensation plate in sequence, and enters the low-pressure area surrounded by the radial clearance compensation block of the arched structure and the gear; the elastic force of the elastic element always presses the radial clearance compensation block toward a pair of externally meshing gears, and a high-pressure clearance chamber is formed between the radial clearance compensation block and the pump wall of the high-pressure gear pump. After the pressure is established, the radial clearance compensation block is further pressed toward the gear; After the gears rotate and engage, the working medium with increased pressure flows out through the oil outlet on the second axial clearance compensation plate, and flows to the hydraulic system pump oil through the oil outlet channel and the oil outlet on the rear end cover in turn.

6. A method for installing a high-pressure gear pump according to claim 3 or 4, characterized in that: The steps are as follows: S1. First press the shaft sleeve into the front cover, insert the oil seal into the front cover, and install the retaining ring to prevent the oil seal from falling out; S2. Install the sealing ring and the second sealing gasket into the front end cover; S3. Put the pump casing into the front cover. The stopper on the front cover, which has the same shape as the inner cavity of the pump casing, serves as a positioning device. S4, installing the first axial clearance compensation plate; S5. Install a pair of external meshing gears; S6. Install the radial clearance compensation block, insert the positioning pin into the matching pin hole of the radial clearance compensation block and the pump body, and install the elastic element between the radial clearance compensation block and the inner wall of the pump housing; S7, installing the second axial clearance compensation plate; S8. Install the sealing ring and the second sealing gasket into the rear end cover, and use grease to ensure that the two do not fall off the rear end cover; install the rear end cover into the pump housing, and the stopper on the rear end cover with the same shape as the pump housing chamber serves as a positioning function; S9. Install 4 bolts and tighten them with the tightening torque. After assembly is completed, rotate the external gear to check whether it can rotate flexibly.

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