Split type pump head for high-pressure common rail pump

Abstract

The split type pump head for the high-pressure common rail pump comprises an oil outlet pump head and an electromagnetic valve component and is characterized in that the oil outlet pump head is pressed on an engine cylinder body through a screw or a stud, and the electromagnetic valve component is installed on the oil outlet pump head and used for controlling the oil outlet pump head to spray oil. The oil outlet pump head is controlled by a cam arranged on an engine valve cam shaft in an engine cylinder body to pressurize and suck fuel oil. The split type pump head with the separated engine cylinder body is adopted, the oil outlet pump head is pressed on the engine cylinder body through the screw or the stud, and the split type pump head has the advantages of being simple and low in cost.

Description

Technical Field

[0001] The invention relates to the technical field of high-pressure common rail pumps, and in particular to a split pump head for a high-pressure common rail pump, which is mainly used in high-power medium and heavy-duty diesel engines. Background Art

[0002] The fuel injection pressure of new diesel engines must be above 130Mpa, while the injection timing and injection pressure must be precisely controlled. High-pressure common rail fuel injection system is one of the best solutions to meet the above requirements. However, due to the large gap between the manufacturing level of my country's fuel system and that of foreign counterparts, the scale of investment is also subject to some restrictions. It is difficult to put the newly designed high-pressure common rail pump into mass production for a while.

[0003] The existing mechanically controlled axial piston distribution pump has been developed in China for more than 20 years. The technology is becoming more and more mature. All parts have been completely domestically produced and mass-produced for use in light vehicles. Some parts are also exported as accessories. Its structure and working principle can be found in [Wang Jiuru. Progress of VE distribution pump for high-speed direct injection diesel engines [J]. Oil Pump and Nozzle Technology, 1992, (2) 15-21].

[0004] As a high-pressure common rail pump, it only needs to accurately supply oil to the common rail pipe according to the requirements of the engine. The plunger does not need to be processed with a distribution groove to distribute the fuel to each injector. The plunger does not need to bear the lateral force generated by the high-pressure oil. The oil supply mechanism is relatively simple and has good sealing. At the same time, it does not require complex mechanical or electronic speed regulators and fuel advancers, and the mechanical and electrical structures are greatly simplified.

[0005] The pump head is an important component of the high-pressure common rail pump. The current pump head is not a split type, has a complex structure and high manufacturing cost. Summary of the invention

[0006] The technical problem to be solved by the present invention is to provide a split pump head for a high-pressure common rail pump with a simple structure and low manufacturing cost, in view of the problem that the existing high-pressure common rail pump is not split and has a complex structure and high manufacturing cost.

[0007] The technical problem to be solved by the present invention can be achieved by the following technical solutions:

[0008] A split pump head for a high-pressure common rail pump comprises an oil delivery pump head and an electromagnetic valve component. The oil delivery pump head is pressed onto an engine cylinder block by screws or studs. The electromagnetic valve component is mounted on the oil delivery pump head to control the oil delivery pump head to spray oil. The oil delivery pump head is controlled by a cam on an engine valve camshaft arranged in the engine cylinder block to pressurize and absorb the fuel.

[0009] In a preferred embodiment of the present invention, the oil outlet pump head comprises:

[0010] A pump sleeve, wherein a plurality of pressure-stabilizing oil holes for installing a pressure-stabilizing valve are arranged on the sleeve wall of the pump sleeve, and the pressure-stabilizing valve is installed in the pressure-stabilizing oil holes and is connected with the fuel storage tank through an oil pipe;

[0011] A valve body installed on the upper part of the pump sleeve, wherein the valve body is provided with an oil outlet hole and an inlet and outlet oil passage in sequence from top to bottom along the central axis of the valve body, and a stopper mounting cavity, a control valve core mounting hole, and an electromagnetic valve component mounting hole are respectively provided on both sides of the valve body perpendicular to the central axis, wherein the control valve core mounting hole is coaxial with the electromagnetic valve component mounting hole and the electromagnetic valve component mounting hole is located on the outside of the control valve core mounting hole; an oil inlet hole, an oil inlet joint mounting hole, a first oil return hole and a second oil return hole are provided in the valve body, one end of the oil inlet hole is communicated with the oil inlet joint installed in the oil inlet joint mounting hole, and the oil inlet joint is connected to the fuel storage tank through an oil pipe to realize oil inlet, on the one hand, the other end of the oil inlet hole is communicated with one end of the first oil return hole through the control valve core mounting hole, and on the other hand, the other end of the oil inlet hole is communicated with the inlet and outlet oil passages through the control valve core mounting hole; one end of the second oil return hole is communicated with the stopper mounting cavity; a pump body conical surface is provided at the connection between the control valve core mounting hole and the inlet and outlet oil passages;

[0012] A plunger sleeve installed in the pump sleeve, a first oil return gap and a second oil return gap are arranged between the upper end surface of the plunger sleeve and the lower end surface of the valve body, the other end of the first oil return hole is communicated with the first oil return gap, the other end of the second oil return hole is communicated with the second oil return gap, the first oil return gap and the second oil return gap are also connected to a pressure stabilizing oil hole; a plunger hole and a third oil return hole perpendicular to the plunger hole are arranged in the plunger sleeve along the central axis of the plunger sleeve, and the third oil return hole is also connected to another pressure stabilizing oil hole;

[0013] A control valve core installed in the control valve core installation hole, one end of the control valve core extends into the inlet and outlet oil passages, and a sealing cone surface is provided at one end of the control valve core to seal with the pump body cone surface;

[0014] The solenoid valve component is installed in the solenoid valve component installation hole and connected to the other end of the control valve core to drive the control valve core to operate. When the solenoid component is not energized, the control valve core is in an open state, and the fuel enters the inlet and outlet oil passages through the gap between the sealing cone surface of the control valve core and the cone surface of the pump body. When the solenoid component is energized, the control valve core is in a closed state, and the sealing cone surface of the control valve core is in sealing contact with the cone surface of the pump body.

[0015] The plunger is installed in the plunger hole by a limit screw, and a spring seat is installed at the bottom of the plunger.

[0016] A plunger spring with an upper end sleeved on the lower end of the plunger sleeve extending outside the pump sleeve and on the lower end of the plunger, wherein the upper end of the plunger spring acts on the plunger sleeve and the lower section acts on the spring seat;

[0017] A stopper component is installed in the stopper installation cavity, and the stopper component limits the movement stroke of the control valve core.

[0018] In a preferred embodiment of the present invention, the block component includes a separately designed block and a locking nut, the block is pressed into the block installation cavity by threadedly installing the locking nut in the block installation cavity, and the position of the block is adjusted by the locking nut.

[0019] In a preferred embodiment of the present invention, the solenoid valve component includes: a valve seat, a solenoid valve spring, a solenoid valve cap, an armature and an electromagnet; the electromagnet is installed in the mounting hole of the solenoid valve component through the solenoid valve cap, and the solenoid valve cap is threadedly connected to the valve body; the armature is movably arranged in the mounting hole of the solenoid valve component and moves driven by the electromagnetic force generated by the electromagnet; the valve seat is fixed on the end of the control valve core mounting hole adjacent to the solenoid valve component mounting hole; the other end of the control valve core passes through the valve seat and is fixedly connected to the armature, and is driven to move by the movement of the armature; the solenoid valve spring is located in the control valve core mounting hole and is sleeved on the control valve core, one end of the solenoid valve spring acts on the control valve core, and the other end acts on the valve seat.

[0020] In a preferred embodiment of the present invention, the electromagnet is circular.

[0021] In a preferred embodiment of the present invention, an oil outlet valve is arranged in the oil outlet hole, and the oil outlet valve is a one-way valve, including: an oil outlet valve body, a steel ball, a steel ball seat, an oil outlet valve spring and an oil outlet valve seat, an oil outlet valve cavity is arranged in the oil outlet valve body, and an oil outlet valve oil inlet hole and an oil outlet hole of the oil outlet valve are respectively arranged at two ends of the oil outlet valve body; an oil outlet valve sealing cone surface is arranged at the inner end of the oil outlet valve oil inlet hole; the steel ball, steel ball seat, oil outlet valve spring and oil outlet valve seat are sequentially installed in the oil outlet valve cavity from one end of the oil outlet valve oil inlet hole to one end of the oil outlet valve oil outlet hole, one end of the oil outlet valve spring acts on the oil outlet valve seat, and the other end acts on the steel ball seat and presses the steel ball on the oil outlet valve sealing cone surface through the steel ball seat to seal the oil outlet valve oil inlet hole.

[0022] In a preferred embodiment of the present invention, an oil inlet passage of an oil outlet valve is provided in the steel ball seat, an oil outlet passage of an oil outlet valve is provided in the oil outlet valve seat, and the oil outlet passage of the oil outlet valve is connected with the oil outlet hole of the oil outlet valve; when the steel ball is pushed open by the external oil pressure to overcome the spring force of the oil outlet valve spring, the oil inlet passage of the oil outlet valve is connected with the oil inlet hole of the oil outlet valve.

[0023] Due to the adoption of the above technical solution, the present invention adopts a split pump head separated from the engine cylinder body and presses the oil outlet pump head onto the engine cylinder body by screws or studs, which has the advantages of simplicity and low cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is one of the schematic diagrams of the appearance of the split pump head for the high-pressure common rail pump of the present invention.

[0025] Figure 2 This is the second schematic diagram of the appearance of the split pump head for the high-pressure common rail pump of the present invention.

[0026] Figure 3 for Figure 1 A-A section view.

[0027] Figure 4 for Figure 3 Magnified view of point I.

[0028] Figure 5 It is a structural diagram of the oil outlet valve. DETAILED DESCRIPTION

[0029] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments.

[0030] See also Figures 1 to 5 The split pump head for a high-pressure common rail pump shown in the figure includes an oil delivery pump head 100 and a solenoid valve component 200. The oil delivery pump head 200 is pressed on the engine cylinder block by screws or studs. The solenoid valve component 200 is installed on the oil delivery pump head to control the oil delivery pump head 100 to spray oil. The oil delivery pump head 100 is controlled by a cam on an engine valve camshaft arranged in the engine cylinder block to pressurize and absorb the fuel.

[0031] The oil delivery pump head 100 includes a pump sleeve 110 , a valve body 120 , a plunger sleeve 130 , a control valve core 140 , a plunger 150 , a plunger spring 160 , a spring seat 170 and a stopper component 180 .

[0032] A plurality of pressure-stabilizing oil holes 111 and 112 for installing a pressure-stabilizing valve are arranged on the sleeve wall of the pump sleeve 110. The pressure-stabilizing valve is installed in the pressure-stabilizing oil holes 111 and 112 and is connected to the fuel storage tank through an oil pipe.

[0033] The lower end of the valve body 120 is installed in the middle and upper part of the pump sleeve 110, and an oil outlet hole 121 and an oil inlet and outlet passage 122 are sequentially arranged in the valve body 120 from top to bottom along the central axis of the valve body 120. In addition, a stopper installation cavity 123, a control valve core installation hole 124, and a solenoid valve component installation hole 125 are respectively arranged on both sides perpendicular to the central axis of the valve body 120, wherein the control valve core installation hole 124 is coaxial with the solenoid valve component installation hole 125 and the solenoid valve component installation hole 125 is located outside the control valve core installation hole 124.

[0034] An oil inlet hole (not shown in the figure), an oil inlet joint mounting hole 126, an oil return hole 127 (the aforementioned first oil return hole) and an oil return hole 128 (the aforementioned second oil return hole) are provided in the valve body 120. One end of the oil inlet hole is connected to the oil inlet joint installed in the oil inlet joint mounting hole 126, and the oil inlet joint is connected to the fuel storage tank through an oil pipe to realize oil inlet.

[0035] The other end of the oil inlet hole is connected to one end of the oil return hole 127 through the control valve core installation hole 124 on the one hand, and is connected to the inlet and outlet oil channel 122 on the other hand.

[0036] One end of the oil return hole 128 is communicated with the block mounting cavity 123 ; a pump body conical surface 124 a is provided at the connection between the control valve core mounting hole 124 and the inlet and outlet oil passages 122 .

[0037] The upper part of the plunger sleeve 130 is installed in the middle and lower part of the pump sleeve 110, and an oil return gap A (the aforementioned first oil return gap) and an oil return gap B (the aforementioned second oil return gap) are arranged between the upper end surface of the plunger sleeve 130 and the lower end surface of the valve body 120. The other end of the oil return hole 127 is connected to the oil return gap A, and the other end of the oil return hole 128 is connected to the oil return gap B. The oil return gap A and the oil return gap B are also connected to a pressure-stabilizing oil hole 111.

[0038] A plunger hole 131 and a third oil return hole 132 (the aforementioned third oil return hole) perpendicular to the plunger hole are provided in the plunger sleeve 130 along the central axis of the plunger sleeve 130 . The oil return hole 132 is also connected to another pressure-stabilizing oil hole 112 .

[0039] The control valve core 140 is installed in the control valve core installation hole 124, and one end of the control valve core 140 extends into the inlet and outlet oil channel 122. A sealing cone surface 141 is provided at one end of the control valve core 140 to seal with the pump body cone surface 124a.

[0040] The solenoid valve component 200 includes a valve seat 210, a solenoid valve spring 220, a solenoid valve cap 230, an armature 240 and an electromagnet 250; the electromagnet 250 is installed in the solenoid valve component mounting hole 125 through the solenoid valve cap 230, and the solenoid valve cap 230 is threadedly connected to the valve body 120; the armature 240 is movably arranged in the solenoid valve component mounting hole 125 and moves driven by the electromagnetic force generated by the electromagnet 250; the valve seat 210 is fixed on the end of the control valve core mounting hole 124 adjacent to the solenoid valve component mounting hole 125; the other end of the control valve core 140 passes through the valve seat 210 and is fixedly connected to the armature 240 by a screw 260, and is driven to move by the movement of the armature 240; the solenoid valve spring 220 is located in the control valve core mounting hole 124 and is sleeved on the control valve core 140, one end of the solenoid valve spring 220 acts on the control valve core 140, and the other end acts on the valve seat 210.

[0041] The electromagnet 250 is round, and has much smaller dimensions than the previous square electromagnets, and has better processability.

[0042] When the electromagnet 250 is not energized, the control valve core 140 moves in the opening direction under the action of the solenoid valve spring 220, so that the control valve core 140 is in an open state, and the fuel enters the inlet and outlet oil channels 122 through the gap between the sealing cone surface 141 of the control valve core 140 and the pump body cone surface 124a. When the electromagnet 250 is energized, it drives the armature 240 and the control valve core 140 to move in the closing direction, so that the control valve core 140 is in a closed state. At this time, the sealing cone surface 141 of the control valve core 140 is in sealing contact with the pump body cone surface 124a.

[0043] The plunger 150 is installed in the plunger hole 131 by means of a limit screw 190 . A spring seat 170 is installed at the bottom of the plunger 150 . The diameter d of the plunger 150 is 8-12 mm.

[0044] The upper end of the plunger spring 160 is sleeved on the lower end of the plunger sleeve 130 extending out of the pump sleeve 110 and the lower end of the plunger 150. The upper end of the plunger spring 160 acts on the plunger sleeve 130, and the lower section acts on the spring seat 170. Under the action of the plunger spring 160, the plunger 150 moves downward, so that the section of the inlet and outlet oil passage 122 located at the upper end of the plunger 150 forms a high-pressure oil chamber C. When the plunger 150 and the spring seat 170 are pushed upward by the cam and roller body components arranged on the engine valve camshaft to overcome the spring force of the plunger spring 160, the plunger 150 compresses the fuel entering the high-pressure oil chamber C into high-pressure fuel.

[0045] The stopper component 180 includes a split stopper 181 and a locking nut 182, which has better processability than the integral control valve core adjustment pad (see Chinese invention patent No. 201410411407.3, which discloses a common rail unit pump for a high-pressure common rail fuel injection system). The stopper 181 is pressed into the stopper installation cavity 123 by means of a locking nut 182 installed in the stopper installation cavity 123 by means of a thread, and the position of the stopper 181 is adjusted by the locking nut 182 to limit the movement stroke of the control valve core 140.

[0046] An oil outlet valve 300 is installed in the oil outlet hole 121 . The oil outlet valve 300 is a one-way valve. The bottom of the oil outlet valve 300 contacts the transition between the oil outlet hole 121 and the oil inlet and outlet passage 122 to limit the position.

[0047] The oil outlet valve 300 includes an oil outlet valve body 310, a steel ball 320, a steel ball seat 330, an oil outlet valve spring 340 and an oil outlet valve seat 350. An oil outlet valve cavity 311 is arranged in the oil outlet valve body 310, and an oil outlet valve oil inlet hole 312 and an oil outlet valve oil outlet hole 313 are respectively arranged at both ends of the oil outlet valve body 310; the oil outlet valve oil inlet hole 312 is connected to the inlet and outlet oil channels 122.

[0048] The inner end of the oil outlet valve oil inlet hole 312 is provided with an oil outlet valve sealing cone surface 312a; the steel ball 320, the steel ball seat 330, the oil outlet valve spring 340 and the oil outlet valve seat 350 are sequentially installed in the oil outlet valve cavity 311 from one end of the oil outlet valve oil inlet hole 312 to one end of the oil outlet valve oil outlet hole 313; the upper end of the oil outlet valve spring 340 acts on the oil outlet valve seat 340, and the lower end acts on the steel ball seat 330 and presses the steel ball 320 on the oil outlet valve sealing cone surface 312a through the steel ball seat 330 to seal the oil outlet valve oil inlet hole 312. Compared with the cone surface sealing (see the common rail monomer pump for high pressure common rail fuel injection system disclosed in Chinese invention patent No. 201410411407.3), the use of the steel ball 320 for sealing has better processability and sealing effect.

[0049] An oil outlet valve oil inlet passage 331 is provided in the steel ball seat 330, and an oil outlet valve oil outlet passage 351 is provided in the oil outlet valve seat 350, and the oil outlet valve oil outlet passage 351 is communicated with the oil outlet valve oil outlet hole 313; when the steel ball 320 is pushed open by the external oil pressure to overcome the spring force of the oil outlet valve spring 340, the oil outlet valve oil inlet passage 331 is communicated with the oil outlet valve oil inlet hole 312.

[0050] The specific working principle of the present invention is as follows:

[0051] The fuel storage tank is supplied with fuel through the oil pipe, the oil inlet joint on the oil delivery pump head 100 and the oil inlet hole in the valve body 110 via the oil delivery pump or the oil level pressure difference.

[0052] When the plunger 150 moves downward from the top dead center driven by the plunger spring 160, the oil outlet valve 300 is in a closed state under the action of the oil outlet valve spring 340, the electromagnet 250 is not energized, and the control valve core 140 is in an open state under the action of the solenoid valve spring 220. The high-pressure oil chamber C is in a negative pressure state, and the fuel in the oil inlet hole passes through the gap between the sealing cone surface 141 of the control valve core 140 and the pump body cone surface 124a into the inlet and outlet oil channel 122, and then enters the high-pressure oil chamber C, thereby completing the oil suction process.

[0053] When the plunger 150 and the spring seat 170 are arranged on the cam and roller body components on the engine valve camshaft and move upward to overcome the spring force of the plunger spring 160, the fuel in the high-pressure oil chamber C is compressed. When the electromagnet 250 is not energized, the control valve core 140 is in an open state under the action of the solenoid valve spring 220, and the fuel flows back to the control valve core mounting hole 124 through the gap between the sealing cone surface 141 of the control valve core 140 and the pump body cone surface 124a, and then enters the fuel storage tank through the return oil hole 127, the return oil gap A, the pressure-stabilizing oil hole 111, the pressure-stabilizing valve and the oil pipe. At this time, the fuel pressure is not enough to overcome the pressure of the oil outlet valve spring 340 and the fuel in the oil pipe on the steel ball, so the split pump head used for the high-pressure common rail pump does not supply oil.

[0054] When the plunger 150 and the spring seat 170 are arranged on the cam and roller body parts of the engine valve camshaft and move upward to overcome the spring force of the plunger spring 160, the fuel in the high-pressure oil chamber C is compressed. When the electromagnet 250 is energized, the armature 240 and the control valve core 140 are driven to move in the closing direction under the action of the electromagnetic force, so that the control valve core 140 is in a closed state. At this time, the sealing cone surface 141 of the control valve core 140 and the cone surface 12 of the pump body are in contact with each other. 4a sealed contact, thereby increasing the fuel pressure in the high-pressure oil chamber C. The fuel pressure overcomes the pressure of the oil outlet valve spring 340 and the fuel in the oil pipe on the steel ball, causing the steel ball 320 to separate from the oil outlet valve sealing cone 312a, and the fuel enters the oil outlet valve chamber 311 through the oil outlet valve inlet passage 331 in the steel ball seat 330 to accumulate pressure. After the high-pressure fuel is accumulated in the oil outlet valve chamber 311, it is distributed to the injector through the oil outlet valve outlet passage 351 in the oil outlet valve seat 350 and the high-pressure oil pipe.

[0055] The high-pressure fuel in the block mounting cavity 123 enters the fuel storage tank through the oil return gap A of the return oil hole 128, the pressure-stabilizing oil hole 111, the pressure-stabilizing valve and the oil pipe. The high-pressure fuel leaked in the plunger hole 131 enters the fuel storage tank through the third oil return hole 132, another pressure-stabilizing oil hole 112, the pressure-stabilizing valve and the oil pipe.

Claims

1. A split pump head for a high-pressure common rail pump, comprising an oil outlet pump head and a solenoid valve component, characterized in that: The oil delivery pump head is pressed onto the engine cylinder block by screws or studs, and the solenoid valve component is installed on the oil delivery pump head to control the oil delivery pump head to spray oil. The oil delivery pump head is controlled by a cam on the engine valve camshaft arranged in the engine cylinder block to pressurize and absorb the fuel.

2. A split pump head for a high-pressure common rail pump according to claim 1, characterized in that: The oil outlet pump head comprises: A pump sleeve, wherein a plurality of pressure-stabilizing oil holes for installing a pressure-stabilizing valve are arranged on the sleeve wall of the pump sleeve, and the pressure-stabilizing valve is installed in the pressure-stabilizing oil holes and is connected with the fuel storage tank through an oil pipe; A valve body installed on the upper part of the pump sleeve, wherein the valve body is provided with an oil outlet hole and an inlet and outlet oil passage in sequence from top to bottom along the central axis of the valve body, and a stopper mounting cavity, a control valve core mounting hole, and an electromagnetic valve component mounting hole are respectively provided on both sides of the valve body perpendicular to the central axis, wherein the control valve core mounting hole is coaxial with the electromagnetic valve component mounting hole and the electromagnetic valve component mounting hole is located on the outside of the control valve core mounting hole; an oil inlet hole, an oil inlet joint mounting hole, a first oil return hole and a second oil return hole are provided in the valve body, one end of the oil inlet hole is communicated with the oil inlet joint installed in the oil inlet joint mounting hole, and the oil inlet joint is connected to the fuel storage tank through an oil pipe to realize oil inlet, on the one hand, the other end of the oil inlet hole is communicated with one end of the first oil return hole through the control valve core mounting hole, and on the other hand, the other end of the oil inlet hole is communicated with the inlet and outlet oil passages through the control valve core mounting hole; one end of the second oil return hole is communicated with the stopper mounting cavity; a pump body conical surface is provided at the connection between the control valve core mounting hole and the inlet and outlet oil passages; A plunger sleeve installed in the pump sleeve, a first oil return gap and a second oil return gap are arranged between the upper end surface of the plunger sleeve and the lower end surface of the valve body, the other end of the first oil return hole is communicated with the first oil return gap, the other end of the second oil return hole is communicated with the second oil return gap, the first oil return gap and the second oil return gap are also connected to a pressure stabilizing oil hole; a plunger hole and a third oil return hole perpendicular to the plunger hole are arranged in the plunger sleeve along the central axis of the plunger sleeve, and the third oil return hole is also connected to another pressure stabilizing oil hole; A control valve core installed in the control valve core installation hole, one end of the control valve core extends into the inlet and outlet oil passages, and a sealing cone surface is provided at one end of the control valve core to seal with the pump body cone surface; The solenoid valve component is installed in the solenoid valve component installation hole and connected to the other end of the control valve core to drive the control valve core to operate. When the solenoid component is not energized, the control valve core is in an open state, and the fuel enters the inlet and outlet oil passages through the gap between the sealing cone surface of the control valve core and the cone surface of the pump body. When the solenoid component is energized, the control valve core is in a closed state, and the sealing cone surface of the control valve core is in sealing contact with the cone surface of the pump body. The plunger is installed in the plunger hole by a limit screw, and a spring seat is installed at the bottom of the plunger. A plunger spring with an upper end sleeved on the lower end of the plunger sleeve extending outside the pump sleeve and on the lower end of the plunger, wherein the upper end of the plunger spring acts on the plunger sleeve and the lower section acts on the spring seat; A stopper component is installed in the stopper installation cavity, and the stopper component limits the movement stroke of the control valve core.

3. A split pump head for a high-pressure common rail pump according to claim 2, characterized in that: The stopper component comprises a stopper and a locking nut of separate design. The stopper is pressed into the stopper installation cavity by means of a locking nut which is installed in the stopper installation cavity in a threaded manner, and the position of the stopper is adjusted by means of the locking nut.

4. A split pump head for a high-pressure common rail pump according to claim 3, characterized in that: The solenoid valve component comprises: a valve seat, a solenoid valve spring, a solenoid valve cap, an armature and an electromagnet; the electromagnet is installed in the mounting hole of the solenoid valve component through the solenoid valve cap, and the solenoid valve cap is threadedly connected to the valve body; the armature is movably arranged in the mounting hole of the solenoid valve component and moves driven by the electromagnetic force generated by the electromagnet; the valve seat is fixed on the end of the control valve core mounting hole adjacent to the solenoid valve component mounting hole; the other end of the control valve core passes through the valve seat and is fixedly connected to the armature, and is driven to move by the movement of the armature; the solenoid valve spring is located in the control valve core mounting hole and is sleeved on the control valve core, one end of the solenoid valve spring acts on the control valve core, and the other end acts on the valve seat.

5. A split pump head for a high-pressure common rail pump according to claim 4, characterized in that: The electromagnet is circular.

6. A split pump head for a high-pressure common rail pump according to claim 4, characterized in that: An oil outlet valve is arranged in the oil outlet hole, and the oil outlet valve is a one-way valve, including: an oil outlet valve body, a steel ball, a steel ball seat, an oil outlet valve spring and an oil outlet valve seat, an oil outlet valve cavity is arranged in the oil outlet valve body, and an oil outlet valve oil inlet hole and an oil outlet hole of the oil outlet valve are respectively arranged at two ends of the oil outlet valve body; an oil outlet valve sealing cone surface is arranged at the inner end of the oil outlet valve oil inlet hole; the steel ball, steel ball seat, oil outlet valve spring and oil outlet valve seat are sequentially installed in the oil outlet valve cavity from one end of the oil outlet valve oil inlet hole to one end of the oil outlet valve oil outlet hole, one end of the oil outlet valve spring acts on the oil outlet valve seat, and the other end acts on the steel ball seat and presses the steel ball on the oil outlet valve sealing cone surface through the steel ball seat to seal the oil outlet hole of the oil outlet valve.

7. A split pump head for a high-pressure common rail pump according to claim 4, characterized in that: An oil inlet passage of the oil outlet valve is arranged in the steel ball seat, an oil outlet passage of the oil outlet valve is arranged in the oil outlet valve seat, and the oil outlet passage of the oil outlet valve is communicated with the oil outlet hole of the oil outlet valve; when the steel ball is pushed open by the external oil pressure to overcome the spring force of the oil outlet valve spring, the oil inlet passage of the oil outlet valve is communicated with the oil inlet hole of the oil outlet valve.

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