Fuel injection pump fuel quantity adjusting mechanism

Abstract

The application relates to the technical field of fuel injection pumps, in particular to a fuel injection pump oil quantity adjusting mechanism, a sealing unit of which is composed of a fuel discharge valve body fixedly arranged on a cylinder, a valve core is slidably arranged in the fuel discharge valve body, a first fuel outlet hole is arranged on the side wall of the fuel discharge valve body, a large connecting hole is arranged on the side wall of the valve core, and a small connecting hole is further arranged on the valve core. After all the gas in the low-pressure oil cavity of the fuel system is discharged, the fuel discharge valve body is filled with fuel, the fuel flows back to the oil tank from the small connecting hole of the valve core and the first fuel outlet hole of the fuel discharge valve body. However, because the small connecting hole on the valve core has a small diameter, the fuel flow through the valve core is obviously less than the fuel supplied by the fuel pump, the oil pressure in the pump cavity is increased, the oil pressure makes the valve core move downward against the spring, the flow area formed by the small connecting hole of the valve core and the first fuel outlet hole of the fuel discharge valve is smaller, and the valve core continues to move.

Description

Technical Field

[0001] This invention relates to the field of fuel injection pump technology, specifically to a fuel injection pump fuel quantity adjustment mechanism. Background Technology

[0002] The fuel injection pump is an indispensable core component in automotive hydrogen-ammonia fuel cell engines, directly determining the engine's fuel supply efficiency, power output, and operational stability. The fuel injection pump assembly is mainly composed of the pump body, governor, and various auxiliary components. This integrated design makes the overall structure more compact and adaptable to various automotive hydrogen-ammonia fuel cell engines. The governor is the core control component, ensuring stable low-speed operation of the engine, preventing idling vibrations and stalling, while also strictly limiting the engine's maximum operating speed to prevent damage from overspeeding. It precisely controls the matching relationship between fuel injection quantity and engine speed, ensuring balanced and stable power output. As the core actuator of the fuel supply system, the fuel injection pump is responsible for delivering high-pressure fuel to the cylinders in a timely and quantitative manner.

[0003] Currently, to effectively address common issues such as engine running with an empty fuel tank, difficulty in venting the fuel system after replacing the fuel filter, and air accumulation in the intake, the industry generally adds a dedicated venting pipe to the pressure side of the fuel system of engines adapted to hydrogen-ammonia fuel. This venting pipe allows air mixed in the pipelines and fuel system components that transport the hydrogen-ammonia medium to flow smoothly back into the storage tank, quickly completing the air venting operation. This enables the pump chamber to quickly establish the medium pressure at the moment of engine start-up, rapidly reaching the opening pressure required by the plunger feed valve inside the high-pressure fuel injection pump, ensuring smooth hydrogen-ammonia fuel supply and rapid engine start-up.

[0004] However, in actual driving conditions, when the vehicle is traveling on a long downhill section, the engine is running at high speed, but the actual supply of hydrogen ammonia fuel required for driving is greatly reduced. At this time, the feed pump works at high speed along with the engine, while the fuel metering valve is at a small opening, and the flow rate of the medium is strictly limited. Under this condition, the circulation velocity of hydrogen ammonia medium inside the pipeline is unbalanced, and residual air is very easy to get stuck inside the pump chamber of the high-pressure fuel injection pump. It cannot be completely discharged in time by relying on the original venting pipeline, thus affecting the stable delivery of hydrogen ammonia fuel and the normal operation of the engine. Summary of the Invention

[0005] Based on the aforementioned problems in the existing technology, the problem to be solved by this application is: However, in actual vehicle driving conditions, when the vehicle is driving on a long downhill section, the engine is running at a high speed, but the actual supply of hydrogen ammonia fuel required for driving is greatly reduced. At this time, the feed pump keeps running at a high speed with the engine, while the fuel metering valve is in a small opening state, and the medium delivery flow rate is strictly limited. Under this condition, the circulation velocity of hydrogen ammonia medium inside the pipeline is unbalanced, and residual air is easily trapped inside the pump chamber of the high-pressure fuel injection pump. It cannot be completely discharged in time by relying on the original venting pipeline, thereby affecting the stable delivery of hydrogen ammonia fuel and the normal operation of the engine.

[0006] The technical solution adopted by this application to solve its technical problem is: a fuel injection pump oil quantity regulating mechanism, including a housing, a bracket fixedly installed on the side wall of the housing, an oil delivery pipe fixedly installed on the bracket, a connecting cylinder fixedly installed on the top of the housing, a plunger pressure plate movably installed on the connecting cylinder, and a cylinder fixedly installed on the bottom of the housing. Oil return unit; the oil return unit includes a cap fixedly mounted on the plunger pressure plate, a turntable fixedly mounted on the cap, a connecting shaft rotatably mounted inside the turntable, a large gear fixedly mounted on the connecting shaft, a plunger shaft fixedly mounted at the bottom of the large gear, and a plunger sleeve fixedly mounted inside the outer shell; The sealing unit includes an oil discharge valve body fixedly mounted on the cylinder, a valve core slidably mounted inside the oil discharge valve body, a first oil outlet hole on the side wall of the oil discharge valve body, a large connection hole on the side wall of the valve core, and a small connection hole on the valve core.

[0007] Preferably, a positioning plate is fixedly provided on the side wall of the connecting cylinder, and multiple positioning plates are evenly arranged among each other. The positioning plate is provided with threaded holes, and the connecting cylinder, the cylindrical body and the unloading valve body are coaxially arranged.

[0008] Preferably, a positioning block is fixedly disposed inside the outer shell, a movable plug is slidably disposed inside the positioning block, a spring three is fixedly disposed on the bottom end of the cylinder, and the other end of the spring three is fixedly connected to the movable plug.

[0009] Preferably, a plunger sleeve is fixedly installed inside the outer casing. A lower oil return hole is opened on one side of the plunger sleeve, and an upper oil return hole is opened on the other side of the plunger sleeve. The upper oil return hole and the lower oil return hole are spaced at the same distance. A sliding groove is opened on the plunger sleeve. An adjusting plate is fixedly installed on the bottom end of the large gear, and the adjusting plate is slidably connected to the sliding groove. A limiting hole is opened on the adjusting plate. The limiting hole is teardrop-shaped with one end larger than the other. A guide groove is opened on the side wall of the plunger shaft. The guide groove is inclined arc-shaped.

[0010] Preferably, the plunger shaft has a second oil return hole, and the guide groove has a leakage hole at both the highest and lowest ends, and both leakage holes are interconnected with the second oil return hole.

[0011] Preferably, the top of the unloading valve body is in communication with the plunger sleeve, and a spring is fixedly installed on the bottom end of the valve core, with the other end of the spring fixedly connected to the bottom end of the unloading valve body.

[0012] Preferably, an oil unloading groove is provided on the side wall of the valve core, and the oil unloading groove is located below the large connecting hole.

[0013] Preferably, the vertical height of the guide groove is equal to the depth of the second oil return hole.

[0014] Preferably, the depth of the groove is below the upper oil return hole and above the lower oil return hole, and the diameter of the upper oil return hole is greater than the minimum end diameter and less than the maximum end diameter.

[0015] Preferably, a support plate is fixedly provided on the outer circumferential surface of the connecting cylinder, a small gear is rotatably provided on the support plate, a lever is fixedly provided on the small gear, and the small gear meshes with the large gear.

[0016] The beneficial effects of this application are: 1. The cavity within the outer casing allows for the storage of hydrogen-ammonia fuel during pipeline transportation. The fuel enters the plunger sleeve via the lower return oil hole. Since the adjusting plate fixed to the large gear blocks the upper return oil hole, it lacks flow. As the plunger pressure plate slides up and down, the plunger shaft, fixed to it, also slides up and down, compressing the hydrogen-ammonia fuel inside the plunger sleeve. As the pressure increases, the movable plunger increases its pressure on the spring, and the movable plunger is in a descending state. When the movable plunger descends to a certain position, the slit on its side wall will... The pressurized and heated hydrogen-ammonia fuel inside the plunger sleeve is transported into the cylinder. During this transport process, not only the processed hydrogen-ammonia fuel is transported, but also a certain amount of gas. When facing high-speed oil transport, the operator rotates the small gear to control the rotation of the large gear, which in turn controls the rotation of the adjusting plate. This causes the limiting hole at the bottom of the adjusting plate to connect with the upper oil return hole, and the guide groove to connect with the lower oil return hole. This allows a larger amount of hydrogen-ammonia fuel in the outer shell cavity to enter the processing chamber when the plunger shaft is pressed down. The inclined guide groove can also connect with the lower oil return hole more quickly, enabling the oil to return earlier. The processed hydrogen-ammonia fuel then enters the circular hole.

[0017] 2. After all the gas in the low-pressure fuel chamber of the fuel system is expelled, the unloading valve body is filled with fuel. The fuel will flow back to the fuel tank from the small connecting hole of the valve core and the first outlet hole of the unloading valve body. However, because the diameter of the small connecting hole on the valve core is small, the amount of fuel flowing out through the valve core is significantly less than the amount of fuel supplied by the fuel pump. The oil pressure in the pump chamber increases, and the oil pressure causes the valve core to move downward against the spring. As a result, the flow area formed by the small connecting hole of the valve core and the first outlet hole of the unloading valve body is smaller. The valve core continues to move. When the valve core moves to the point where both the large connecting hole and the small connecting hole are completely sealed by the inner wall of the valve body, the overflow valve will no longer overflow. This prevents fuel waste caused by fuel backflow. When the engine is running at a high speed but the actual amount of fuel needed is low, such as when a car is going downhill for a long time, the fuel pump speed is high and the fuel metering valve opening is very small, which causes the fuel pressure in the pump chamber to rise. The increased pressure causes the valve core of the overflow valve to continue to move against the spring force. At this time, the large connecting hole will connect with the first oil outlet. The excess fuel in the pump chamber will then flow back to the fuel tank through the large connecting hole of the valve core and the first oil outlet of the unloading valve body, thus preventing the pressure inside the pump chamber from becoming too high. At this time, the unloading trough remains connected to the first oil outlet to ensure the normal delivery of internal gas. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the internal structure of the present invention; Figure 3 This is a partial structural diagram of the present invention; Figure 4 This is a schematic diagram of the internal structure of the plunger sleeve of the present invention; Figure 5 This is a schematic diagram of the plunger shaft structure of the present invention; Figure 6 This is a schematic diagram of the internal structure of the unloading valve body of the present invention; Figure 7 This is a schematic diagram of the valve core structure of the present invention; Figure 8 This is a schematic diagram of the internal structure of the valve core of the present invention.

[0019] In the diagram: 1. Outer shell; 11. Bracket; 12. Oil supply pipe; 2. Connecting cylinder; 21. Positioning plate; 22. Threaded hole; 23. Support plate; 24. Pinion; 241. Paddle plate; 3. Cylinder; 4. Unloading valve body; 41. First oil outlet; 42. Valve core; 421. Round hole; 43. Large connecting hole; 44. Small connecting hole; 431. Spring one; 45. Unloading groove; 5. Plunger pressure plate; 51. Cap; 52. Turntable; 6. Connecting shaft; 60. Spring two; 61. Large gear; 62. Plunger shaft; 621. Guide groove; 6211. Leakage hole; 622. Oil return hole two; 63. Adjusting plate; 631. Limiting hole; 7. Positioning block; 71. Plunger sleeve; 711. Lower oil return hole; 712. Upper oil return hole; 72. Slide groove; 8. Movable plug; 81. Spring three. Detailed Implementation

[0020] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0021] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort should fall within the scope of protection of the present application.

[0022] Reference Figures 1-8 A fuel injection pump oil quantity adjustment mechanism includes a housing 1, which serves as a support base for the entire device and functions to activate, protect, and fix various components. A bracket 11 is fixedly installed on the side wall of the housing 1. The bracket 11 is used for positioning devices. An oil supply pipe 12 is fixedly installed on the bracket 11. A connecting cylinder 2 is fixedly installed on the top of the housing 1. A plunger pressure plate 5 is movably installed on the connecting cylinder 2.

[0023] Reference Figures 2-5A positioning plate 21 is fixedly installed on the side wall of the connecting cylinder 2. Multiple positioning plates 21 are evenly arranged among each other. The positioning plate 21 has a threaded hole 22, which can be used to lock and position external accessories with bolts, effectively limiting component displacement and improving assembly stability. The connecting cylinder 2, the cylinder 3 and the unloading valve body 4 are coaxially arranged to ensure the concentricity of the internal transmission and oil supply components, reducing running jamming and wear. A plunger shaft 62 is fixedly installed at the bottom of the large gear 61. A second spring 60 is fixedly installed on the large gear 61. The other end of the second spring 60 abuts against the cap 51. The elasticity of the second spring 60 forms an elastic pressing structure, which can not only play a role in resetting and limiting the gear assembly, but also buffer the vibration generated by operation, making the gear meshing transmission more stable and smooth. Together with the overall structure, it can accurately complete the internal oil quantity adjustment action of the fuel injection pump, ensuring accurate and reliable oil supply adjustment.

[0024] A cylinder 3 is fixedly installed at the bottom of the outer casing 1. Oil return unit; the oil return unit includes a cap 51 fixedly mounted on the plunger pressure plate 5, a turntable 52 fixedly mounted on the cap 51, and a connecting shaft 6 rotatably mounted inside the turntable 52.

[0025] Reference Figures 1-3 A positioning block 7 is fixedly installed inside the outer shell 1, and a movable plug 8 is slidably installed inside the positioning block 7. The positioning block 7 is used to limit the movable plug 8. A spring 81 is fixed on the bottom end of the cylinder 3, and the other end of the spring 81 is fixedly connected to the movable plug 8.

[0026] A large gear 61 is fixedly installed on the connecting shaft 6, and a plunger sleeve 71 is fixedly installed inside the outer casing 1; Reference Figures 2-5 A plunger sleeve 71 is fixedly installed inside the outer casing 1. A lower oil return hole 711 is opened on one side of the plunger sleeve 71, and an upper oil return hole 712 is opened on the other side of the plunger sleeve 71. The upper oil return hole 712 and the lower oil return hole 711 are spaced at the same distance. A sliding groove 72 is opened on the plunger sleeve 71. An adjusting plate 63 is fixedly installed on the bottom end of the large gear 61. The adjusting plate 63 is slidably connected to the sliding groove 72. A limiting hole 631 is opened on the adjusting plate 63. The limiting hole 631 is teardrop-shaped with one end larger than the other. A second oil return hole 622 is opened inside the plunger shaft 62. Both the highest and lowest ends of the guide groove 621 are provided with leakage holes 6211, and both leakage holes 6211 are interconnected with the second oil return hole 622.

[0027] A guide groove 621 is provided on the side wall of the plunger shaft 62, and the guide groove 621 is set in an inclined arc shape. When the oil pipe 12 transports hydrogen-ammonia fuel, it can be stored in the cavity inside the outer shell 1. The hydrogen-ammonia fuel in the cavity will enter the interior of the plunger sleeve 71 through the lower oil return hole 711 on the plunger sleeve 71. Since the adjusting plate 63 fixed on the large gear 61 blocks the upper oil return hole 712, the upper oil return hole 712 is not flowable at this time. As the plunger pressure plate 5 slides up and down, the plunger shaft 62 fixedly connected to it will also slide up and down, thereby compressing the hydrogen-ammonia fuel inside the plunger sleeve 71. As the pressure increases, the movable plug 8 will increase its pressure on the spring 81, and the movable plug 8 will... In a descending state, when the movable plug 8 descends to a certain position, the slit on its side wall will transport the pressurized and heated hydrogen-ammonia fuel inside the plunger sleeve 71 to the cylinder 3. At this time, the transport process includes not only the processed hydrogen-ammonia fuel, but also a certain amount of gas. When facing high-speed oil transport, the operator can control the rotation of the large gear 61 by rotating the small gear 24, thereby controlling the rotation of the adjusting plate 63 so that the limiting hole 631 at the bottom of the adjusting plate 63 is connected to the upper oil return hole 712. At this time, the guide groove 621 is also connected to the lower oil return hole 711, so that when the plunger shaft 62 is pressed down, a larger amount of hydrogen-ammonia fuel in the cavity of the outer shell 1 can enter the processing chamber.

[0028] The sealing unit includes an oil discharge valve body 4 fixedly mounted on the cylinder 3.

[0029] Reference Figures 1-3 The top of the unloading valve body 4 is connected to the plunger sleeve 71. A spring 431 is fixedly installed on the bottom end of the valve core 42, and the other end of the spring 431 is fixedly connected to the bottom end of the unloading valve body 4.

[0030] A valve core 42 is slidably installed inside the unloading valve body 4.

[0031] Reference Figures 6-8 An oil unloading groove 45 is provided on the side wall of the valve core 42, and the oil unloading groove 45 is located below the large connecting hole 43. When the oil unloading groove 45 is connected to the first oil outlet hole 41, it can ensure the normal transportation of internal gas.

[0032] The unloading valve body 4 has a first oil outlet hole 41 on its side wall, the valve core 42 has a large connection hole 43 on its side wall, and the valve core 42 also has a small connection hole 44.

[0033] Reference Figures 6-8The vertical height of the guide groove 621 is equal to the depth of the second oil return hole 622. The depth of the sliding groove 72 is below the upper oil return hole 712 and above the lower oil return hole 711. The diameter of the upper oil return hole 712 is greater than the minimum diameter of the limiting hole 631 and less than the maximum diameter of the limiting hole 631. By setting the size relationship between the various components, it is ensured that the device will not jam during operation. Reference Figures 1-3 A support plate 23 is fixedly installed on the outer circumferential surface of the connecting cylinder 2. A small gear 24 is rotatably installed on the support plate 23. A lever plate 241 is fixedly installed on the small gear 24. The small gear 24 meshes with the large gear 61. The rotation angle of the large gear 61 can be easily adjusted by the gear combination installed on the support plate 23. The support plate 23 is provided with a circular fixing hole, and a corresponding pin is slidably installed on the lever plate 241 for easy fixing.

[0034] The specific solution is as follows: When using the device, the operator first fixes the device in the predetermined position, connects the oil pipeline to the oil pipeline 12, and fixes the linkage device of the car to the plunger pressure plate 5. Through the cavity set in the outer shell 1, the hydrogen ammonia fuel can be stored in the cavity in the outer shell 1 when the oil pipeline 12 is transported. The hydrogen ammonia fuel in the cavity flows back into the interior of the plunger sleeve 71 through the lower return oil hole 711 on the plunger sleeve 71. Since the adjusting plate 63 fixed on the large gear 61 blocks the upper return oil hole 712, the upper return oil hole 712 is not flowable at this time. As the plunger pressure plate 5 slides up and down, the plunger shaft 62 fixedly connected to it will also slide up and down, thereby compressing the hydrogen ammonia fuel inside the plunger sleeve 71. As the pressure increases, the movable plug 8 will increase its pressure on the spring 81, and the movable plug 8 is in a descending state.

[0035] When the movable plug 8 descends to a certain position, the slit on its side wall will transport the pressurized and heated hydrogen-ammonia fuel inside the plunger sleeve 71 to the cylinder 3. At this time, the transportation process includes not only the processed hydrogen-ammonia fuel, but also a certain amount of gas. When facing high-speed oil transportation, the operator can control the rotation of the large gear 61 by rotating the small gear 24, which in turn controls the rotation of the adjusting plate 63 so that the limiting hole 631 at the bottom of the adjusting plate 63 is connected to the upper oil return hole 712. At this time, the guide groove 621 is also connected to the lower oil return hole 711, so that when the plunger shaft 62 is pressed down, the hydrogen-ammonia fuel in the cavity of the outer shell 1 can enter the processing chamber in a larger amount. The inclined guide groove 621 can connect to the lower oil return hole 711 more quickly to achieve early oil return. The processed hydrogen-ammonia fuel enters the circular hole 421.

[0036] After all the gas inside the low-pressure fuel chamber of the fuel system is expelled, the unloading valve body 4 is filled with fuel. The fuel will flow back to the fuel tank from the small connecting hole 44 of the valve core 42 and the first outlet hole 41 of the unloading valve body 4. However, because the diameter of the small connecting hole 44 on the valve core 42 is small, the amount of fuel flowing out through the valve core 42 is significantly less than the amount of fuel supplied by the fuel pump. The oil pressure in the pump chamber increases, and the oil pressure causes the valve core 42 to move downward against the spring 431. As a result, the flow area formed by the small connecting hole 44 of the valve core 42 and the first outlet hole 41 of the unloading valve body 4 is smaller. The valve core 42 continues to move. When the valve core 42 moves to the point where both the large connecting hole 43 and the small connecting hole 44 are completely sealed by the inner wall of the valve body, at this time... The overflow valve will no longer overflow, thus eliminating fuel waste caused by fuel backflow. When the engine is running at a high speed but the actual fuel demand is low, such as when a car is going downhill for a long time, the fuel pump speed is high and the fuel metering valve opening is very small, causing the fuel pressure in the pump chamber to rise. The increased pressure causes the valve core 42 of the overflow valve to continue moving against the spring force. At this time, the large connecting hole 43 will be connected to the first oil outlet 41. At this time, the excess fuel in the pump chamber will flow back to the fuel tank through the large connecting hole 43 of the valve core 42 and the first oil outlet 41 of the unloading valve body 4, thereby preventing the pressure inside the pump chamber from being too high. At this time, the unloading groove 45 remains connected to the first oil outlet 41 to ensure the normal delivery of internal gas.

[0037] Those skilled in the art should understand that the discussion of any of the above embodiments is merely exemplary. Under the framework of this invention, the technical features of the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations of the different aspects of the invention as described above, which are not provided in detail for the sake of brevity.

[0038] This invention is intended to cover all such substitutions, modifications, and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this invention should be included within the scope of protection of this invention.

Claims

1. A fuel injection pump fuel quantity regulating mechanism, comprising a housing (1), a bracket (11) fixedly disposed on the side wall of the housing (1), an oil supply pipe (12) fixedly disposed on the bracket (11), a connecting cylinder (2) fixedly disposed on the top of the housing (1), a plunger pressure plate (5) movably disposed on the connecting cylinder (2), and a cylinder (3) fixedly disposed on the bottom of the housing (1), characterized in that Also includes: Oil return unit; the oil return unit includes a cap (51) fixedly mounted on the plunger pressure plate (5), a turntable (52) fixedly mounted on the cap (51), a connecting shaft (6) rotatably mounted inside the turntable (52), a large gear (61) fixedly mounted on the connecting shaft (6), and a plunger sleeve (71) fixedly mounted inside the outer shell (1). The sealing unit includes an oil discharge valve body (4) fixedly mounted on the cylinder (3), a valve core (42) slidably mounted inside the oil discharge valve body (4), a first oil outlet hole (41) is provided on the side wall of the oil discharge valve body (4), a large connection hole (43) is provided on the side wall of the valve core (42), and a small connection hole (44) is also provided on the valve core (42).

2. The fuel injection pump fuel quantity regulating mechanism according to claim 1, characterized in that, A positioning plate (21) is fixedly installed on the side wall of the connecting cylinder (2). Multiple positioning plates (21) are evenly arranged. A threaded hole (22) is opened on the positioning plate (21). The connecting cylinder (2), the cylinder (3) and the unloading valve body (4) are coaxially arranged. A plunger shaft (62) is fixedly installed at the bottom of the large gear (61). A second spring (60) is fixedly installed on the large gear (61). The other end of the second spring (60) abuts against the cap (51).

3. The fuel injection pump quantity regulating mechanism according to claim 2, characterized in that, A positioning block (7) is fixedly installed inside the outer shell (1), and a movable plug (8) is slidably installed inside the positioning block (7). A spring three (81) is fixedly installed on the bottom end of the cylinder (3), and the other end of the spring three (81) is fixedly connected to the movable plug (8).

4. The fuel injection pump fuel quantity regulating mechanism according to claim 3, characterized in that, A plunger sleeve (71) is fixedly installed inside the outer shell (1). A lower oil return hole (711) is opened on one side of the plunger sleeve (71), and an upper oil return hole (712) is opened on the other side of the plunger sleeve (71). The upper oil return hole (712) and the lower oil return hole (711) are spaced at the same distance. A sliding groove (72) is opened on the plunger sleeve (71). An adjusting plate (63) is fixedly installed on the bottom end of the large gear (61). The adjusting plate (63) is slidably connected to the sliding groove (72). A limiting hole (631) is opened on the adjusting plate (63). The limiting hole (631) is teardrop-shaped with one end larger than the other. A guide groove (621) is opened on the side wall of the plunger shaft (62). The guide groove (621) is inclined arc-shaped.

5. The fuel injection pump quantity regulating mechanism according to claim 4, characterized in that, The plunger shaft (62) has a return oil hole 2 (622) inside, and the guide groove (621) has a leakage hole (6211) at both the highest and lowest ends, and the two leakage holes (6211) are connected to the return oil hole 2 (622).

6. The fuel injection pump fuel quantity regulating mechanism according to claim 5, characterized in that, The top of the unloading valve body (4) is connected to the plunger sleeve (71), and a spring (431) is fixedly installed on the bottom end of the valve core (42). The other end of the spring (431) is fixedly connected to the bottom end of the unloading valve body (4).

7. The fuel injection pump fuel quantity regulating mechanism according to claim 6, characterized in that, An oil unloading groove (45) is provided on the side wall of the valve core (42), and the oil unloading groove (45) is located below the large connecting hole (43).

8. The fuel injection pump quantity regulating mechanism according to claim 7, characterized in that, The vertical height of the guide groove (621) is equal to the depth of the return oil hole (622).

9. The fuel injection pump quantity regulating mechanism according to claim 8, characterized in that, The depth of the groove (72) is below the upper oil return hole (712) and above the lower oil return hole (711), and the diameter of the upper oil return hole (712) is greater than the minimum end diameter of (613) and less than the maximum end diameter of (613).

10. The fuel injection pump fuel quantity regulating mechanism according to claim 9, characterized in that, A support plate (23) is fixedly provided on the outer circumferential surface of the connecting cylinder (2). A small gear (24) is rotatably provided on the support plate (23). A lever plate (241) is fixedly provided on the small gear (24). The small gear (24) meshes with the large gear (61).

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