Power control valve for axial piston pump and axial piston pump

Abstract

The utility model provides a kind of power control valve and axial plunger pump for axial plunger pump, it is related to hydraulic control valve technical field, including valve body, first oil inlet, oil outlet and electric control power assembly are provided on valve body, electric control power assembly includes power valve core, electric thrust element, top seat, L type lever and power piston, power valve core is set on the first oil path between first oil inlet and oil outlet, and the end of power valve core is connected with first spring;Top seat is located in the side of electric thrust element, and second spring is further provided between top seat and electric thrust element;L type lever includes first rod body and second rod body, and the end of power piston passes through strip-shaped opening and abuts with second rod body, the power of axial plunger pump can be adjusted by the energization state of remote control electric thrust element, replace the method for changing the power of axial plunger pump by traditional hand-adjusted constant power valve, and adjustment mode is more simple.

Description

Technical Field

[0001] This utility model relates to the field of hydraulic control valve technology, and in particular to a power control valve for an axial piston pump and an axial piston pump. Background Technology

[0002] Variable displacement piston pumps have a high market share in the construction machinery piston pump market due to their reliable and stable performance.

[0003] Existing variable displacement piston pumps have a relatively simple power control method, relying solely on a constant power valve for constant power control. When the pump's power needs to be changed, the parameters of the constant power valve must be manually adjusted, which is inconvenient. Moreover, if the installation space for the constant power valve is limited, the adjustment difficulty will be further increased.

[0004] Therefore, in order to better meet the needs of the engineering field and expand the construction machinery market, it is necessary to develop a brand-new control mechanism for variable displacement piston pumps. Utility Model Content

[0005] The purpose of this invention is to provide a power control valve for an axial piston pump and an axial piston pump to solve the problems existing in the prior art. It can remotely control the energization state of the electric thrust element to adjust the power of the axial piston pump, replacing the traditional method of manually adjusting the constant power valve to change the power of the axial piston pump, and the adjustment method is more convenient.

[0006] To achieve the above objectives, this utility model provides the following solution:

[0007] A power control valve for an axial piston pump includes a valve body with a first oil inlet, an oil outlet, and an electronically controlled power assembly. The first oil inlet is connected to the oil outlet of the axial piston pump, and the oil outlet is connected to the rodless chamber of a reset cylinder in the axial piston pump. The electronically controlled power assembly includes:

[0008] A power valve core is movably disposed in the valve body and disposed in a first oil passage between the first oil inlet and the oil outlet. A first spring is connected to the end of the power valve core, and the first spring is used to apply a thrust to the power valve core. The sliding of the power valve core can control the opening and closing of the first oil passage and the opening area.

[0009] Electric thrust components;

[0010] A top seat is located on one side of the electric thrust element, which can push the top seat to move toward one end of the power valve core. A second spring is also provided between the top seat and the electric thrust element.

[0011] The L-shaped lever includes a first rod and a second rod connected in an L-shape. The connection position of the first rod and the second rod is rotatably disposed in the valve body. The two sides of the end of the first rod abut against the end of the top seat away from the electric thrust element and the end of the power valve core away from the first spring, respectively. The second rod faces the strip-shaped opening provided on the valve body.

[0012] And a power piston, which is slidably disposed in a radial through hole on a positioning piston in the axial piston pump, and the end of the power piston passes through the strip opening and abuts against the second rod.

[0013] In one embodiment, the electric thrust element is an electromagnet, which generates a thrust on the top seat when energized.

[0014] As one embodiment, the electronically controlled power assembly further includes a first plug and a first adjusting rod. The first plug is detachably connected to the valve body. The first spring is located in the cavity of the first plug. The two ends of the first spring are respectively connected to a first spring seat and a second spring seat. The first spring seat and the second spring seat are slidably disposed coaxially in the cavity of the first plug. The first spring seat abuts against the end of the power valve core away from the L-shaped lever. One end of the first adjusting rod extends into the cavity of the first plug and abuts against the second spring seat. The first adjusting rod is axially movable.

[0015] In one embodiment, a first nut is fixed on the first screw plug, and the first adjusting rod is threadedly connected to the first nut.

[0016] In one embodiment, a roller is provided at the end of the power piston, and the roller abuts against the second rod.

[0017] As one embodiment, it also includes a third spring and a piston sleeve fixed in the radial through hole of the positioning piston. The power piston is slidably disposed in the piston sleeve. The two ends of the third spring are respectively connected to the piston sleeve and one end of the power piston near the second rod.

[0018] In one embodiment, the valve body is further provided with a second oil inlet and a load-sensitive component. The second oil inlet is used to connect to an external oil circuit, and the load-sensitive component includes:

[0019] A load-sensitive valve sleeve, wherein the load-sensitive valve sleeve is fixed in the valve body;

[0020] A load-sensitive valve core is slidably disposed in the load-sensitive valve sleeve; the load-sensitive valve core is disposed in a second oil passage between the first oil inlet and the oil outlet, and the second oil passage is connected in parallel with the first oil passage;

[0021] The load-sensitive oil chamber is located at one end of the load-sensitive valve sleeve and is connected to the second oil inlet. The hydraulic oil entering the load-sensitive oil chamber can apply a thrust to the load-sensitive valve core. A fourth spring is provided in the load-sensitive oil chamber, and the fourth spring is used to apply a thrust to the load-sensitive valve core in the same direction as the hydraulic oil.

[0022] The cavity at the other end of the load-sensitive valve core is connected to the first oil inlet.

[0023] In one embodiment, the load-sensitive component further includes a second plug and a second adjusting rod. The second plug is detachably connected to the valve body. The fourth spring is located in the cavity of the second plug, which communicates with the load-sensitive oil cavity. The two ends of the fourth spring are respectively connected to a third spring seat and a fourth spring seat. The third spring seat and the fourth spring seat are coaxially slidably disposed in the cavity of the second plug. The third spring seat abuts against the end of the power valve core away from the L-shaped lever. One end of the second adjusting rod extends into the cavity of the second plug and abuts against the fourth spring seat. The second adjusting rod is axially movable.

[0024] In one embodiment, a second nut is fixed on the second plug, and the second adjusting rod is threadedly connected to the second nut.

[0025] This utility model also discloses an axial piston pump, including a reset cylinder, a positioning cylinder, and a power control valve for the axial piston pump as described above, wherein the rodless chamber of the positioning cylinder is connected to the oil outlet end of the axial piston pump.

[0026] The present invention has the following technical advantages over the prior art:

[0027] This invention, by setting an electronically controlled power component on the valve body, enables remote control of the energization state of the electric thrust element to adjust the power of the axial piston pump, replacing the traditional method of manually adjusting the constant power valve to change the power of the axial piston pump, making the adjustment method simpler.

[0028] Other technical solutions in this utility model have the following technical effects compared to the prior art:

[0029] This invention, by setting a load-sensitive component, can adjust the power of the axial piston pump according to the oil pressure change at a specific location in the oil circuit system, which can save energy and further improve the applicability of the power control valve. Attached Figure Description

[0030] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0031] Figure 1 This is a schematic diagram of the cooperation structure between the axial piston pump and the power control valve in one embodiment of the present invention;

[0032] Figure 2 This is a front view of the power control valve in one embodiment of the present invention;

[0033] Figure 3 for Figure 2 The left view;

[0034] Figure 4 for Figure 2 Sectional view of AA;

[0035] Figure 5 for Figure 3 A cross-sectional view of BB.

[0036] Explanation of reference numerals in the attached figures:

[0037] 1. Swashplate; 2. Reset piston rod; 3. Reset piston; 4. Positioning piston rod; 5. Positioning piston; 6. Valve body; 7. Electrical control power assembly; 8. Load-sensitive assembly;

[0038] 61. First oil inlet; 62. Second oil inlet;

[0039] 701. Power valve core; 702. Electromagnet; 703. Top seat; 704. L-shaped lever; 705. Power piston; 706. First spring; 707. Second spring; 708. First plug; 709. First adjusting rod; 710. First spring seat; 711. Second spring seat; 712. Roller; 713. Piston sleeve; 714. Third spring;

[0040] 811. Load-sensitive valve sleeve; 812. Load-sensitive valve core; 813. Load-sensitive oil chamber; 814. Fourth spring; 815. Screw plug; 816. Second screw plug; 817. Second adjusting rod; 818. Third spring seat; 819. Fourth spring seat. Detailed Implementation

[0041] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0042] The purpose of this invention is to provide a power control valve for an axial piston pump and an axial piston pump to solve the problems existing in the prior art. It can remotely control the energization state of the electric thrust element to adjust the power of the axial piston pump, replacing the traditional method of manually adjusting the constant power valve to change the power of the axial piston pump, and the adjustment method is simpler.

[0043] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0044] Example 1:

[0045] like Figures 1-5As shown, this embodiment provides a power control valve for an axial piston pump. The axial piston pump has a swashplate 1, a reset cylinder, and a positioning cylinder. The swashplate 1 is hinged in the middle. The reset cylinder includes a reset cylinder barrel (not shown in the figure) and a reset piston rod 2. One end of the reset piston rod 2 has a reset piston 3, and the other end is connected to one end of the swashplate 1. When oil enters the rodless chamber of the reset cylinder, the reset piston rod 2 can push the swashplate 1, thereby reducing the tilt angle of the swashplate 1 (i.e., increasing the angle between the working surface of the swashplate 1 and the axis of the swashplate 1), which can reduce the power of the axial piston pump. The positioning cylinder includes a positioning cylinder barrel (not shown in the figure) and a positioning piston rod 4. One end of the positioning piston rod 4 has a positioning piston 5, and the other end is connected to the other end of the swashplate 1. The positioning piston rod 4 and the reset piston rod 2 are respectively fixed at both ends of the same radial direction of the swashplate 1. When oil enters the rodless chamber of the positioning cylinder, the positioning piston rod 4 can push the swashplate 1, making the tilt angle of the swashplate 1 larger (i.e., the angle between the working surface of the swashplate 1 and the axis of the swashplate 1 decreases), which can increase the power of the axial piston pump. The rodless chamber of the positioning cylinder is connected to the oil outlet end of the axial piston pump, so that the hydraulic oil at the oil outlet end of the axial piston pump can flow into the rodless chamber of the positioning cylinder. The power control valve for the axial piston pump in this embodiment includes a valve body 6, on which a first oil inlet 61, an oil outlet, and an electronically controlled power assembly 7 are provided. The first oil inlet 61 is connected to the oil outlet end of the axial piston pump, and the oil outlet is connected to the rodless chamber of the reset piston 3 in the axial piston pump. The electronically controlled power assembly 7 includes a power valve core 701, an electric thrust element, a top seat 703, an L-shaped lever 704, and a power piston 705. The power valve core 701 is movably disposed in the valve body 6 and is located in a first oil passage between the first oil inlet 61 and the oil outlet. A first spring 706 is connected to the end of the power valve core 701, and the first spring 706 is used to apply a thrust to the power valve core 701. The sliding of the power valve core 701 can control the opening and closing of the first oil passage. Area; Top seat 703 is located on one side of the electric thrust element, which can push top seat 703 toward one end of power valve core 701. A second spring 707 is also provided between top seat 703 and electric thrust element; L-shaped lever 704 includes a first rod and a second rod connected in an L-shape. The connection position of the first rod and the second rod is rotatably set in valve body 6. The two sides of the end of the first rod abut against the end of top seat 703 away from electric thrust element and the end of power valve core 701 away from first spring 706, respectively; the second rod is directly opposite the strip opening provided on valve body 6; power piston 705 is slidably set in the radial through hole on positioning piston 5 in axial piston pump. The end of power piston 705 passes through the strip opening and abuts against the second rod.

[0046] In use, the axial piston pump operates at a certain power. The hydraulic oil at the outlet of the axial piston pump flows into the rodless chamber of the positioning cylinder. The hydraulic oil pushes the power piston 705 outward through the radial through hole on the positioning piston 5, so that the end of the power piston 705 abuts against the second rod in the L-shaped lever 704 and pushes the second rod. Under the action of the lever, the end of the first rod generates a certain thrust on the power valve core 701. Since the power valve core 701 is also subjected to the thrust applied by the first spring 706, the power valve core 701 will not move toward the first spring 706. When it is necessary to reduce the power of the axial piston pump, the electric thrust element is energized and directly applies a thrust to the end of the first rod. At this time, the first rod pushes the power valve core 701 under the action of the lever and the thrust of the electric thrust element. This can overcome the thrust of the first spring 706 on the power valve core 701, causing the power valve core 701 to move toward the first spring 706. When the power valve core 701 moves, the first oil circuit is opened, and the oil at the oil outlet of the axial piston pump can enter the rodless chamber of the reset cylinder, pushing the reset piston 3 to move. The oil pressure in the rodless chamber of the positioning cylinder decreases, and the positioning piston 5 retracts, thereby reducing the tilt angle of the swashplate 1 and reducing the power of the axial piston pump. When it is necessary to increase the power of the axial piston pump, the power supply of the electric thrust element is disconnected, the electric thrust element loses the thrust on the first rod, the second spring 707 pulls the top seat 703 back, the first spring 706 pushes the power valve core 701 toward the top seat 703, cuts off the first oil circuit, the pressure in the rodless chamber of the positioning cylinder increases, pushes the swashplate 1 to increase the tilt angle of the swashplate 1, and increases the power of the axial piston pump.

[0047] Therefore, by setting the electronically controlled power component 7, this embodiment can remotely control the energization state of the electric thrust element to adjust the power of the axial piston pump, replacing the traditional method of manually adjusting the constant power valve to change the power of the axial piston pump, making the adjustment method simpler.

[0048] In this embodiment, the electric thrust element is an electromagnet 702, and the top seat 703 can be a magnet with the opposite magnetism to that of the electromagnet 702 when energized, so that the electromagnet 702 generates a thrust on the top seat 703 when energized. Furthermore, by adjusting the magnitude of the current flowing through the electromagnet 702, the magnitude of the thrust exerted by the electromagnet 702 on the top seat 703 can be adjusted, thereby controlling the opening of the first oil circuit and the pressure of the oil entering the reset cylinder. This achieves the purpose of the axial piston pump operating at different power levels, thus enhancing the flexibility of the axial piston pump.

[0049] As another application method, the electromagnet 702 can be kept energized with a certain current. When the oil pressure in the rodless chamber of the positioning cylinder is insufficient to move the positioning piston 5 a long distance, that is, when the power piston 705 is insufficient to apply enough thrust to the end of the first rod, the first oil circuit cannot be opened. Only when the power of the axial piston pump reaches a certain level and the pressure at the oil outlet increases to a certain extent, so that the end of the power piston 705 is closer to the end of the second rod, can the first oil circuit be opened, thereby achieving the purpose of reducing the power of the axial piston pump.

[0050] In this embodiment, the electronically controlled power assembly 7 further includes a first plug 708 and a first adjusting rod 709. The first plug 708 is detachably connected to the valve body 6. A first spring 706 is located in the cavity of the first plug 708. The two ends of the first spring 706 are respectively connected to a first spring seat 710 and a second spring seat 711. The first spring seat 710 and the second spring seat 711 are coaxially slidably disposed in the cavity of the first plug 708. The first spring seat 710 abuts against the end of the power valve core 701 away from the L-shaped lever 704. One end of the first adjusting rod 709 extends into the cavity of the first plug 708 and abuts against the second spring seat 711. The first adjusting rod 709 is axially movable. A first nut is fixed on the first plug 708, and the first adjusting rod 709 is threadedly connected to the first nut. By turning the first adjusting rod 709, the thrust of the first spring 706 on the first spring seat 710 can be changed, thereby adjusting the power value of the axial piston pump. For example, when the thrust of the first spring 706 on the first spring seat 710 increases, under the premise that the current of the electromagnet 702 is constant, the positioning piston 5 needs to move a longer distance along the second rod to move the power valve core 701. At this time, the oil pressure in the rodless chamber of the positioning cylinder needs to be greater, and the oil outlet pressure of the axial piston pump also needs to be greater, thereby adjusting the power of the axial piston pump.

[0051] In this embodiment, a roller 712 is provided at the end of the power piston 705, and the roller 712 abuts against the second rod.

[0052] This embodiment also includes a third spring 714 and a piston sleeve 713 fixed in the radial through hole of the positioning piston 5. The power piston 705 is slidably disposed in the piston sleeve 713. The two ends of the third spring 714 are respectively connected to the piston sleeve 713 and the end of the power piston 705 near the second rod. When the oil pressure in the rodless chamber of the positioning cylinder decreases, the thrust of the hydraulic oil on the power piston 705 decreases, and the third spring 714 can pull the power piston 705 back into the piston sleeve 713.

[0053] In this embodiment, the valve body 6 is also provided with a second oil inlet 62 and a load-sensitive component 8. The second oil inlet 62 is used to connect to an external oil circuit, which is used to introduce hydraulic oil from a specific location in the oil circuit system where the axial piston pump is located. For example, the second oil inlet 62 is connected to the load end. The load-sensitive component 8 includes a load-sensitive valve sleeve 811, a load-sensitive valve core 812, and a load-sensitive oil chamber 813. The load-sensitive valve sleeve 811 is fixed in the valve body 6. The load-sensitive valve core 812 is slidably disposed in the load-sensitive valve sleeve 811. The load-sensitive valve core 812 is disposed in a second oil passage between the first oil inlet 61 and the oil outlet, and the second oil passage is connected in parallel with the first oil passage. The load-sensitive oil chamber 813 is located at one end of the load-sensitive valve sleeve 811 and is connected to the second oil inlet 62. The hydraulic oil entering the load-sensitive oil chamber 813 can apply a thrust to the load-sensitive valve core 812. A fourth spring 814 is disposed in the load-sensitive oil chamber 813, and the fourth spring 814 is used to apply a thrust to the load-sensitive valve core 812 in the same direction as the hydraulic oil. The other end of the load-sensitive valve core 812 is located in a cavity that is connected to the first oil inlet 61. A screw plug 815 is fixedly installed in the cavity at the other end of the load-sensitive valve core 812. The end of the screw plug 815 abuts against the other end of the load-sensitive valve core 812. However, the end face area of ​​the other end of the load-sensitive valve core 812 is larger than the end face area of ​​the screw plug, so that the hydraulic oil entering this cavity can apply a thrust to the load-sensitive valve core 812.

[0054] During normal operation, the thrust of the oil pressure introduced through the first inlet 61 on the load-sensitive valve core 812 is equal to the sum of the thrusts of the fourth spring 814 and the oil pressure introduced through the second inlet 62 on the load-sensitive valve core 812. When the oil pressure introduced through the second inlet 62 decreases (for example, when the load decreases), the pressure in the load-sensitive oil chamber 813 decreases. However, the other end of the load-sensitive valve core 812 is connected to the outlet of the axial piston pump, and its pressure has not changed. The thrusts at both ends of the load-sensitive valve core 812 are unbalanced, causing it to move towards the fourth spring 814. This connects the first inlet 61 and the outlet, allowing the oil at the outlet of the axial piston pump to enter the reset cylinder. This pushes the reset piston 3, reducing the tilt angle of the swashplate 1 and decreasing the power of the axial piston pump.

[0055] Therefore, by setting the load-sensitive component 8, this embodiment can adjust the power of the axial piston pump according to the oil pressure change at a specific location in the oil circuit system, which can save energy and further improve the applicability of the power control valve.

[0056] Although in this embodiment Figures 1-5 The complete first and second oil passages are not shown in the valve body 6, but the design of the oil passages in the valve body 6 is well known to those skilled in the art, and they are capable of designing the corresponding oil passage structure based on the above description.

[0057] like Figure 5 As shown, both the first oil inlet 61 and the second oil inlet 62 are sealed with screw plugs when not in use, and are connected to the corresponding positions when in use.

[0058] In this embodiment, the load-sensitive component 8 further includes a second plug 816 and a second adjusting rod 817. The second plug 816 is detachably connected to the valve body 6. A fourth spring 814 is located in the cavity of the second plug 816, which communicates with the load-sensitive oil chamber 813. The two ends of the fourth spring 814 are respectively connected to a third spring seat 818 and a fourth spring seat 819. Both the third spring seat 818 and the fourth spring seat 819 are coaxially slidably disposed in the cavity of the second plug 816. The third spring seat 818 abuts against the end of the power valve core 701 away from the L-shaped lever 704. One end of the second adjusting rod 817 extends into the cavity of the second plug 816 and abuts against the fourth spring seat 819. The second adjusting rod 817 is axially movable. In this embodiment, a second nut is fixed on the second plug 816, and the second adjusting rod 817 is threadedly connected to the second nut. By turning the second adjusting rod 817, the thrust of the fourth spring 814 on the third spring seat 818 can be changed, thereby adjusting the power value of the axial piston pump.

[0059] Example 2:

[0060] This embodiment discloses an axial piston pump, including a reset cylinder, a positioning cylinder, and the power control valve for the axial piston pump in Embodiment 1. The rodless chamber of the positioning cylinder is connected to the oil outlet end of the axial piston pump.

[0061] Any adaptive changes made according to actual needs are within the protection scope of this utility model.

[0062] This utility model uses specific examples to illustrate its principles and implementation methods. The above description of the embodiments is only for the purpose of helping to understand the method and core idea of ​​this utility model. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the idea of ​​this utility model. In summary, the content of this specification should not be construed as a limitation of this utility model.

Claims

1. A power control valve for an axial piston pump, characterized in that, The system includes a valve body, which has a first oil inlet, an oil outlet, and an electronically controlled power assembly. The first oil inlet is connected to the oil outlet of the axial piston pump, and the oil outlet is connected to the rodless chamber of the reset cylinder in the axial piston pump. The electronically controlled power assembly includes: A power valve core is movably disposed in the valve body and disposed in a first oil passage between the first oil inlet and the oil outlet. A first spring is connected to the end of the power valve core, and the first spring is used to apply a thrust to the power valve core. The sliding of the power valve core can control the opening and closing of the first oil passage and the opening area. Electric thrust components; A top seat is located on one side of the electric thrust element, which can push the top seat to move toward one end of the power valve core. A second spring is also provided between the top seat and the electric thrust element. The L-shaped lever includes a first rod and a second rod connected in an L-shape. The connection position of the first rod and the second rod is rotatably disposed in the valve body. The two sides of the end of the first rod abut against the end of the top seat away from the electric thrust element and the end of the power valve core away from the first spring, respectively. The second rod faces the strip-shaped opening provided on the valve body. And a power piston, which is slidably disposed in a radial through hole on a positioning piston in the axial piston pump, and the end of the power piston passes through the strip opening and abuts against the second rod.

2. The power control valve for an axial piston pump according to claim 1, characterized in that, The electric thrust element is an electromagnet, which generates a thrust on the top seat when energized.

3. The power control valve for an axial piston pump according to claim 1, characterized in that, The electronically controlled power assembly further includes a first plug and a first adjusting rod. The first plug is detachably connected to the valve body. The first spring is located in the cavity of the first plug. The two ends of the first spring are respectively connected to a first spring seat and a second spring seat. The first spring seat and the second spring seat are slidably disposed coaxially in the cavity of the first plug. The first spring seat abuts against the end of the power valve core away from the L-shaped lever. One end of the first adjusting rod extends into the cavity of the first plug and abuts against the second spring seat. The first adjusting rod is axially movable.

4. The power control valve for an axial piston pump according to claim 3, characterized in that, A first nut is fixed on the first screw plug, and the first adjusting rod is threadedly connected to the first nut.

5. The power control valve for an axial piston pump according to claim 1, characterized in that, The power piston is provided with a roller at its end, and the roller abuts against the second rod.

6. The power control valve for an axial piston pump according to any one of claims 1 to 5, characterized in that, It also includes a third spring and a piston sleeve fixed in the radial through hole of the positioning piston. The power piston is slidably disposed in the piston sleeve. The two ends of the third spring are respectively connected to the piston sleeve and one end of the power piston near the second rod.

7. The power control valve for an axial piston pump according to claim 6, characterized in that, The valve body is also provided with a second oil inlet and a load-sensitive component. The second oil inlet is used to connect to an external oil circuit, and the load-sensitive component includes: A load-sensitive valve sleeve, wherein the load-sensitive valve sleeve is fixed in the valve body; A load-sensitive valve core is slidably disposed in the load-sensitive valve sleeve; the load-sensitive valve core is disposed in a second oil passage between the first oil inlet and the oil outlet, and the second oil passage is connected in parallel with the first oil passage; The load-sensitive oil chamber is located at one end of the load-sensitive valve sleeve and is connected to the second oil inlet. The hydraulic oil entering the load-sensitive oil chamber can apply a thrust to the load-sensitive valve core. A fourth spring is provided in the load-sensitive oil chamber, and the fourth spring is used to apply a thrust to the load-sensitive valve core in the same direction as the hydraulic oil. The other end of the load-sensitive valve core is located in a cavity that is connected to the first oil inlet.

8. The power control valve for an axial piston pump according to claim 7, characterized in that, The load-sensitive component further includes a second plug and a second adjusting rod. The second plug is detachably connected to the valve body. The fourth spring is located in the cavity of the second plug, which communicates with the load-sensitive oil cavity. The two ends of the fourth spring are respectively connected to a third spring seat and a fourth spring seat. The third spring seat and the fourth spring seat are coaxially slidably disposed in the cavity of the second plug. The third spring seat abuts against the end of the power valve core away from the L-shaped lever. One end of the second adjusting rod extends into the cavity of the second plug and abuts against the fourth spring seat. The second adjusting rod is axially movable.

9. The power control valve for an axial piston pump according to claim 8, characterized in that, A second nut is fixed on the second plug, and the second adjusting rod is threadedly connected to the second nut.

10. An axial piston pump, characterized in that, It includes a reset cylinder, a positioning cylinder, and a power control valve for an axial piston pump as described in any one of claims 1 to 9, wherein the rodless chamber of the positioning cylinder is connected to the oil outlet end of the axial piston pump.

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