A high-pressure fuel supply pump for a high-pressure common rail fuel injection system

Abstract

The present invention discloses a high-pressure fuel supply pump for a high-pressure common rail fuel injection system, and relates to the technical field of high-pressure fuel supply pumps. In view of the problem that the existing high-pressure fuel supply pump uses an independent fixing element to connect the oil pipe for fixing, which is inconvenient to quickly connect the oil pipe for installation and disassembly, increases the workload, and is inconvenient for maintenance, the following scheme is now proposed, including a pump body, the top of the pump body is fixedly provided with a plurality of oil receiving pipes along its length direction, the top two sides of the pump body are fixedly connected with threaded pipes, the internal thread sleeve of the threaded pipe is provided with a screw, the top of the screw is fixedly connected with a movable plate, the interior of the movable plate is provided with a plurality of mounting holes along its length direction, and the internal movable sleeve of the mounting hole is provided with an oil inlet pipe. The present invention is not only convenient for simultaneous disassembly and assembly of multiple oil inlet pipes, convenient for maintenance by staff, and saves workload, but also can disassemble independent oil inlet pipes, which is convenient for disassembly and replacement, and improves the applicability of the device.

Description

Technical Field

[0001] The invention relates to the technical field of high-pressure fuel supply pumps, and in particular to a high-pressure fuel supply pump for a high-pressure common rail fuel injection system. Background Art

[0002] High-pressure common rail electronic fuel injection technology refers to a fuel supply method that completely separates the generation of injection pressure and the injection process from each other in a closed-loop system consisting of a high-pressure fuel pump, a pressure sensor, and an electronic control unit (ECU). It is a method in which the high-pressure fuel pump delivers high-pressure fuel to a common fuel supply pipe, and the oil pressure in the common fuel supply pipe is precisely controlled, so that the pressure of the high-pressure fuel pipe is independent of the engine speed, which can greatly reduce the degree to which the diesel engine fuel supply pressure changes with the engine speed.

[0003] A high-pressure fuel supply pump is generally equipped with multiple oil connecting pipes, which are fixed by independent fixing elements. Similarly, they are also operated independently during disassembly and assembly, which will bring a lot of workload to the disassembly and assembly and affect the maintenance of the pump body. For this reason, we propose a high-pressure fuel supply pump for a high-pressure common rail fuel injection system. Summary of the invention

[0004] The invention proposes a high-pressure fuel supply pump for a high-pressure common rail fuel injection system, which solves the problem that the existing high-pressure fuel supply pump uses an independent fixing element to connect the oil pipe for fixing, which is not convenient for quick connection with the oil pipe for installation and disassembly, increases the workload, and is not convenient for maintenance.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] A high-pressure fuel supply pump for a high-pressure common rail fuel injection system comprises a pump body, a plurality of oil receiving pipes are fixedly arranged on the top of the pump body along the length direction thereof, threaded pipes are fixedly connected to the two sides of the top of the pump body, a screw is provided on the internal threaded sleeve of the threaded pipe, a movable plate is fixedly connected to the top of the screw, a plurality of mounting holes are opened inside the movable plate along the length direction thereof, an oil inlet pipe is provided on the internal movable sleeve of the mounting hole, limiting devices are provided on both sides of the oil inlet pipe, two rotating shafts are rotatably connected inside the movable plate, a second gear is fixedly connected to the bottom end of the rotating shaft, an annular rack is provided at the bottom of the movable plate, a first gear is fixedly provided on the outer ring fixed sleeve of the screw, and the first gear and the second gear are both meshed with the annular rack for transmission.

[0007] Preferably, the limiting device includes a spring, a limiting rod, a push rod and a limiting groove, the limiting groove is opened on the wall of the oil inlet pipe, the internal movable sleeve of the limiting groove is provided with a limiting rod, the top of the limiting rod is welded with a push rod, and the end of the limiting rod away from the oil inlet pipe is connected to a spring.

[0008] Preferably, fixing grooves are provided on both sides of the mounting hole, and the spring and the limiting rod are movably sleeved in the fixing grooves, a connecting hole penetrating the movable plate is provided at the top of the fixing groove, and the push rod penetrates the connecting hole.

[0009] Preferably, four protective plates are provided at the bottom of the movable plate, the vertical section of the protective plate is a U-shaped structure, and the annular rack is movably sleeved inside the protective plate.

[0010] Preferably, two fixing holes are provided on the movable plate, the outer ring fixing sleeve of the rotating shaft is provided with a first bearing, and the first bearing is fixedly connected to the movable plate, and the top end of the rotating shaft is fixedly connected with a handle.

[0011] Preferably, a second bearing is provided on the top fixing sleeve of the screw rod, and the second bearing is connected to the movable plate by bolts.

[0012] Preferably, a sealing gasket is bonded to the bottom end of the oil inlet pipe, and a truncated cone-shaped oil receiving nozzle is provided at the top end of the oil receiving pipe, and the oil receiving nozzle is in contact and sealed with the sealing gasket.

[0013] Compared with the prior art, the present invention has the following beneficial effects:

[0014] 1. The present invention is provided with structures such as a screw, a threaded tube, a rotating shaft, a first gear, a second gear and an annular rack, wherein the rotating shaft drives the second gear to rotate, the second gear drives the annular rack meshing with it to rotate, and the annular rack drives the first gear meshing with it to rotate, and the rotation of the first gear drives the screw to rotate, so that the screw rotates and moves up and down in the threaded tube, and the screw drives the movable plate to move downward, so that the movable plate drives multiple oil inlet pipes to move downward together, so that it is convenient to install and disassemble multiple oil inlet pipes at the same time, which brings convenience to the maintenance of the pump body and saves workload;

[0015] 2. The present invention installs a limit rod, a spring, a push rod and other structures, wherein the spring squeezes the limit rods away from each other, so that the limit rods are tightly inserted into the limit grooves on the oil inlet pipe, thereby preventing the limit rods from being separated from the limit grooves, so that the oil inlet pipe and the movable plate are conveniently formed into a whole, and a single oil inlet pipe is conveniently separated from the movable plate, thereby facilitating the removal and replacement of a single oil inlet pipe;

[0016] In summary, the device has a novel design and is easy to operate. It is not only convenient for simultaneous disassembly and assembly of multiple oil inlet pipes, which facilitates maintenance by staff and saves workload, but also can disassemble independent oil inlet pipes for easy replacement, thereby improving the applicability of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a front view structural schematic diagram of a high-pressure fuel supply pump for a high-pressure common rail fuel injection system proposed by the present invention;

[0018] Figure 2 A bottom view structural diagram of a movable plate, a first gear, a second gear and an annular rack of a high-pressure fuel supply pump for a high-pressure common rail fuel injection system proposed by the present invention;

[0019] Figure 3 A partially enlarged structural schematic diagram of a high-pressure fuel supply pump for a high-pressure common rail fuel injection system proposed by the present invention;

[0020] Figure 4 The present invention is a schematic side view of the structure of a protection plate for a high-pressure fuel supply pump used in a high-pressure common rail fuel injection system.

[0021] In the figure: 1 pump body, 2 oil connecting pipe, 3 threaded pipe, 4 screw, 5 first gear, 6 movable plate, 7 mounting hole, 8 fixing groove, 9 protection plate, 10 annular rack, 11 rotating shaft, 12 second gear, 13 oil inlet pipe, 14 limiting groove, 15 spring, 16 limiting rod, 17 push rod. DETAILED DESCRIPTION

[0022] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0023] Reference Figure 1-4 A high-pressure fuel supply pump for a high-pressure common rail fuel injection system comprises a pump body 1, a plurality of oil receiving pipes 2 are fixedly arranged on the top of the pump body 1 along its length direction, threaded pipes 3 are fixedly connected to both sides of the top of the pump body 1, a screw 4 is arranged on the inner thread sleeve of the threaded pipe 3, a movable plate 6 is fixedly connected to the top of the screw 4, a plurality of mounting holes are opened inside the movable plate 6 along its length direction, an oil inlet pipe 13 is arranged on the inner movable sleeve of the mounting hole, and limit devices are arranged on both sides of the oil inlet pipe 13, two rotating shafts 11 are rotatably connected inside the movable plate 6, a second gear 12 is fixedly connected to the bottom end of the rotating shaft 11, an annular rack 10 is arranged at the bottom of the movable plate 6, a first gear 5 is fixedly arranged on the outer ring of the screw 4, and the first gear 5 and the second gear 12 are both meshed with the annular rack 10 for transmission.

[0024] In this embodiment, the limiting device includes a spring 15, a limiting rod 16, a push rod 17 and a limiting groove 14. The limiting groove 14 is opened on the wall of the oil inlet pipe 13. The limiting groove 14 is internally movable with a limiting rod 16. The top of the limiting rod 16 is welded with a push rod 17. The end of the limiting rod 16 away from the oil inlet pipe 13 is connected to the spring 15.

[0025] In this embodiment, fixing grooves 8 are opened on both sides of the mounting hole 7, and the spring 15 and the limiting rod 16 are movably mounted in the fixing groove 8. A connecting hole penetrating the movable plate 6 is provided at the top of the fixing groove 8, and the push rod 17 penetrates the connecting hole.

[0026] In this embodiment, four protective plates 9 are arranged at the bottom of the movable plate 6 . The vertical section of the protective plate 9 is a U-shaped structure. The annular rack 10 is movably sleeved in the protective plate 9 .

[0027] In this embodiment, two fixing holes are provided on the movable plate 6 , a first bearing is fixedly sleeved on the outer ring of the rotating shaft 11 , and the first bearing is fixedly connected to the movable plate 6 , and a handle is fixedly connected to the top end of the rotating shaft 11 .

[0028] In this embodiment, a second bearing is provided on the top fixed sleeve of the screw rod 4, and the second bearing is connected to the movable plate 6 by bolts.

[0029] In this embodiment, a sealing gasket is bonded to the bottom end of the oil inlet pipe 13, and a truncated cone-shaped oil receiving nozzle is provided at the top end of the oil receiving pipe 2, and the oil receiving nozzle is in contact and sealed with the sealing gasket.

[0030] Working principle, first, the rotating shaft 11 drives the second gear 12 to rotate, and the second gear 12 drives the annular rack 10 meshing with it to rotate, and the annular rack 10 drives the first gear 5 meshing with it to rotate, and the rotation of the first gear 5 drives the screw 4 to rotate, so that the screw 4 rotates and moves up and down in the threaded tube 3, and the screw 4 drives the movable plate 6 to move downward, so that it is convenient for the movable plate 6 to drive multiple oil inlet pipes 13 to move downward together, so that it is convenient to install and disassemble multiple oil inlet pipes 13 at the same time, which brings convenience to the maintenance of the pump body and saves workload. The spring 15 will squeeze the limit rod 16 away from each other, so that the limit rod 16 is tightly inserted into the limiting groove 14 on the oil inlet pipe 13, thereby preventing the limiting rod 15 from being separated from the limiting groove 14, so that the oil inlet pipe 13 and the movable plate 6 form a whole. When disassembly is required, the push rod 17 is pushed away from each other, and the push rod 17 drives the limiting rod 16 to leave the limiting groove 14 and compress the spring 15, so that the oil inlet pipe 13 is convenient to be taken out, thereby facilitating the disassembly and replacement of a single oil inlet pipe 13. The entire device is not only convenient for simultaneous disassembly and assembly of multiple oil inlet pipes 13, convenient for maintenance by staff, and saves workload, but also can disassemble independent oil inlet pipes 13, which is convenient for disassembly and replacement, thereby improving the applicability of the device.

[0031] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A high-pressure fuel supply pump for a high-pressure common rail fuel injection system, comprising a pump body (1), characterized in that: A plurality of oil receiving pipes (2) are fixedly arranged at the top of the pump body (1) along its length direction, and threaded pipes (3) are fixedly connected to both sides of the top of the pump body (1). A screw rod (4) is provided on the internal thread sleeve of the threaded pipe (3), and a movable plate (6) is fixedly connected to the top of the screw rod (4). A plurality of mounting holes are opened inside the movable plate (6) along its length direction, and an oil inlet pipe (13) is provided on the movable sleeve inside the mounting hole. Limiting devices are provided on both sides of the oil inlet pipe (13). Two rotating shafts (11) are rotatably connected inside the movable plate (6), and a second gear (12) is fixedly connected to the bottom end of the rotating shaft (11). An annular rack (10) is provided at the bottom of the movable plate (6), and a first gear (5) is fixedly provided on the outer ring of the screw rod (4), and the first gear (5) and the second gear (12) are both meshed with the annular rack (10) for transmission.

2. A high pressure fuel supply pump for a high pressure common rail fuel injection system according to claim 1, characterized in that: The limiting device comprises a spring (15), a limiting rod (16), a push rod (17) and a limiting groove (14); the limiting groove (14) is provided on the wall of the oil inlet pipe (13); a limiting rod (16) is movably sleeved inside the limiting groove (14); a push rod (17) is welded to the top of the limiting rod (16); and a spring (15) is connected to one end of the limiting rod (16) away from the oil inlet pipe (13).

3. A high pressure fuel supply pump for a high pressure common rail fuel injection system according to claim 2, characterized in that: Fixed grooves (8) are provided on both sides of the mounting hole (7), and the spring (15) and the limiting rod (16) are both movably sleeved in the fixed groove (8). A connecting hole penetrating the movable plate (6) is provided at the top of the fixed groove (8), and the push rod (17) penetrates the connecting hole.

4. A high pressure fuel supply pump for a high pressure common rail fuel injection system according to claim 1, characterized in that: Four protective plates (9) are arranged at the bottom of the movable plate (6); the vertical section of the protective plate (9) is a U-shaped structure; and the annular rack (10) is movably sleeved in the protective plate (9).

5. The high-pressure fuel supply pump for a high-pressure common rail fuel injection system according to claim 1, characterized in that: The movable plate (6) is provided with two fixing holes, the outer ring fixing sleeve of the rotating shaft (11) is provided with a first bearing, and the first bearing is fixedly connected to the movable plate (6), and the top end of the rotating shaft (11) is fixedly connected to a handle.

6. A high pressure fuel supply pump for a high pressure common rail fuel injection system according to claim 1, characterized in that: A second bearing is provided on the top fixing sleeve of the screw rod (4), and the second bearing is connected to the movable plate (6) via bolts.

7. A high pressure fuel supply pump for a high pressure common rail fuel injection system according to claim 1, characterized in that: A sealing gasket is bonded to the bottom end of the oil inlet pipe (13), and a truncated cone-shaped oil receiving nozzle is provided at the top end of the oil receiving pipe (2), and the oil receiving nozzle is in contact and sealed with the sealing gasket.

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