Direct injection valve for hydrogen in cylinder

Abstract

The invention discloses an injection valve for direct injection of hydrogen in a cylinder, which comprises a gas inlet connector assembly, a gas outlet connector assembly, a gas outlet connector assembly, a gas inlet valve assembly and a gas outlet valve assembly, the gas inlet connector assembly is internally provided with a gas inlet hole, and one end of the gas inlet connector assembly is connected with a hydrogen source; the other end of the air inlet connector assembly is inserted into the electromagnet component; one end of the nozzle component is inserted into the other end of the air inlet connector assembly and connected with the other end of the air inlet connector assembly, the other end of the nozzle component is inserted into a cylinder, the nozzle component is driven by the electromagnet component to be opened and closed at regular time, and when the nozzle component is opened, the nozzle component is closed. And hydrogen entering an air inlet hole in the air inlet connector assembly is quantitatively sprayed into the cylinder through the nozzle component. The nozzle component is regularly opened by means of the electromagnet component, so that the nozzle component can quantitatively spray hydrogen into the cylinder, and the nozzle component has the advantage of being convenient to control.

Description

Technical Field

[0001] The present invention belongs to the field of automobile manufacturing, and more specifically, it is an in-cylinder hydrogen direct injection valve. Background Art

[0002] The deterioration of the ecological environment and the shortage of oil resources are two major problems faced by countries around the world in the 21st century. Searching for alternative clean energy is an inevitable choice made by mankind. Hydrogen energy has attracted wide attention due to its characteristics of cleanliness, high efficiency, and renewable sustainability. It is also stepping onto the energy stage of the 21st century and is expected to become the protagonist. The number of automobiles in China has also increased rapidly. By 2023, there are already 320 million vehicles, and their pollution situation is becoming increasingly serious. With the increasing awareness of environmental protection, hydrogen-powered vehicles, as zero-pollution vehicles, have become the first choice. As a key actuator component in the hydrogen engine supply system, the performance of the hydrogen injection valve has a significant impact on injection characteristics such as injection timing, injection duration, and injection mass flow rate. Summary of the Invention

[0003] The purpose of this application is to provide an in-cylinder hydrogen direct injection valve that is easy to control and has a perfect structure, so that hydrogen injection is stable and controllable.

[0004] To achieve the above purpose, the in-cylinder hydrogen direct injection valve of the present invention includes:

[0005] An intake joint assembly, which has an intake hole inside, and one end of the intake joint assembly is connected to a hydrogen source;

[0006] An electromagnet component, and the other end of the intake joint assembly is inserted into the electromagnet component;

[0007] A nozzle component, one end of the nozzle component is inserted into the other end of the intake joint assembly and connected to the other end of the intake joint assembly, and the other end of the nozzle component is inserted into the cylinder and is driven by the electromagnet component to open and close at a fixed time. When the nozzle component is opened, hydrogen entering the intake hole in the intake joint assembly is quantitatively injected into the cylinder through the nozzle component.

[0008] In a preferred embodiment of the present invention, the nozzle component includes a return spring, an armature, an armature rod, a yoke, an iron core, a nozzle body, a valve rod, and a valve rod spring; the end face of the other end of the intake joint assembly is hermetically sealed against the first end face of the flange on the iron core; the coil assembly in the electromagnet component surrounds the periphery of the other end of the intake joint assembly, and the yoke surrounds the periphery of the coil assembly;

[0009] A coaxial first through hole, a second through hole, and a valve rod hole are respectively provided inside the armature, inside the iron core, and inside the nozzle body. The first through hole, the second through hole, and the valve rod hole are also coaxial with the air inlet hole inside the air inlet joint assembly. A part of the return spring, the armature, and the iron core is placed inside the other end of the air inlet joint assembly. The armature rod is slidably disposed inside the first through hole of the armature and the second through hole of the iron core. One end of the return spring acts on the air inlet joint assembly, and the other end of the return spring acts on one end of the armature rod.

[0010] One end of the valve rod is inserted into the second through hole of the iron core and interacts with the other end of the armature rod. The middle section and the other end of the valve rod are placed inside the valve rod hole. The valve rod spring is also placed inside the valve rod hole. One end of the valve rod spring acts on the valve rod, and the other end of the valve rod spring acts on the nozzle body. One end of the nozzle body is inserted into the iron core and is hermetically fitted with the iron core. A spherical surface is provided at the other end of the valve rod, and a conical surface is provided at the other end of the nozzle body.

[0011] During the movement of the valve rod, after the spherical surface and the conical surface are hermetically fitted, the nozzle component is closed. After the spherical surface and the conical surface are separated, the nozzle component is opened, and hydrogen is sprayed into the cylinder through the gap between the spherical surface and the conical surface.

[0012] In a preferred embodiment of the present invention, the electromagnet component is limited by the first end face of the flange on the iron core.

[0013] In a preferred embodiment of the present invention, a cover plate is provided on the electromagnet component. The cover plate cooperates with the iron core to level the solenoid valve component. An anti-rotation notch is provided on the cover plate to prevent the electromagnet component from rotating.

[0014] In a preferred embodiment of the present invention, a bushing is fixed on the armature rod. The outer peripheral surface of the bushing is slidably fitted with the first through hole of the armature to guide and position the armature rod. A vent hole is provided on the bushing. The vent hole communicates the air inlet hole inside the air inlet joint assembly with the first through hole inside the armature. The other end of the return spring acts on the bushing.

[0015] In a preferred embodiment of the present invention, a first stepped hole and a second stepped hole are provided at a position near the return spring in the air inlet joint assembly. The inner diameter of the first stepped hole is smaller than that of the second stepped hole. One end of the return spring is inserted into the first stepped hole and acts on the stepped surface between the first stepped hole and the air inlet hole; the upper end of the armature is inserted into the second stepped hole, and the upper end surface of the armature contacts the stepped surface of the second stepped hole for positioning, so as to ensure that the return spring has a suitable pre-tension force.

[0016] In a preferred embodiment of the present invention, a magnetic isolation sleeve is provided inside the air inlet joint assembly at a position corresponding to the coil assembly.

[0017] In a preferred embodiment of the present invention, an adjusting gasket is provided between the other end of the armature rod and one end of the valve rod.

[0018] In a preferred embodiment of the present invention, a third stepped hole, an inclined hole and a fourth stepped hole coaxial with the valve rod hole are provided inside one end of the nozzle body. The diameter of the third stepped hole is equal to the large head diameter of the inclined hole. The small head diameter of the inclined hole is equal to the diameter of the fourth stepped hole, and the diameter of the fourth stepped hole is larger than the diameter of the valve rod hole; a spring seat is provided at the position where the valve rod is located inside the third stepped hole. One end of the valve rod spring acts on the spring seat, and the other end of the valve rod spring acts on the stepped surface between the fourth stepped hole and the valve rod hole.

[0019] In a preferred embodiment of the present invention, a guiding section slidably matched with the valve rod hole is provided on the valve rod. The guiding section guides and positions the valve rod, and an air vent hole is provided on the guiding section.

[0020] In a preferred embodiment of the present invention, a sleeve is provided on the second end surface of the flange of the iron core. One end of the nozzle body is inserted into the sleeve and is hermetically fitted with the sleeve by welding.

[0021] Due to the adoption of the above technical solution, the nozzle component of the present invention is periodically opened by the electromagnet component, so that the nozzle component can quantitatively inject hydrogen into the cylinder, which has the advantage of being easy to control. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the structure of the in-cylinder hydrogen direct injection valve of the present invention.

[0023] Figure 2 It is a schematic diagram of the structure of the nozzle assembly in the in-cylinder hydrogen direct injection valve structure of the present invention.

[0024] Figure 3This is a schematic structural diagram of the armature assembly in the in-cylinder hydrogen direct injection valve structure of the present invention.

[0025] Figure 4 This is a schematic structural diagram of the intake joint assembly in the in-cylinder hydrogen direct injection valve structure of the present invention. Detailed implementation manners

[0026] The working process and principle of the present invention are as follows:

[0027] Refer to Figures 1 to 4 , the in-cylinder hydrogen direct injection valve shown in the figure includes: an intake joint assembly 100, an electromagnet component 200, and a nozzle component 300.

[0028] The intake joint assembly 100 has an intake hole 110. Two O-ring seals 120 are sleeved on the upper end of the intake joint assembly 100 to connect to the hydrogen source. A stepped hole 130 (the aforementioned first stepped hole), a stepped hole 140 (second stepped hole), and a stepped hole 150 are provided at the lower end of the intake hole 110. The diameters of the intake hole 110, the stepped hole 130, the stepped hole 140, and the stepped hole 150 increase in sequence and are coaxial. A stepped shaft 160 and a stepped shaft 170 are provided on the outer periphery of the lower end of the intake joint assembly 100. The lower end of the intake joint assembly 100 is inserted into the electromagnet component 200 and is firmly connected to the electromagnet component 200 through the stepped shaft 160 and the stepped shaft 170.

[0029] A magnetic isolation sleeve 180 is provided in the stepped hole 150. The magnetic isolation sleeve 180 is made of a non-magnetic material. The upper end surface of the magnetic isolation sleeve 180 is connected to the stepped surface 190 between the stepped hole 150 and the stepped hole 140 by laser welding, and it is ensured that the inner hole of the magnetic isolation sleeve 180 is coaxial with the stepped hole 150.

[0030] The electromagnet component 200 includes a coil assembly 210 and a housing 220. A plug 230 is provided on the housing 220. The plug post on the plug 230 is made of copper material and is electrically connected to the coil in the rest of the coil assembly 210. The housing 220 of the electromagnet component 200 surrounds the periphery of the intake joint assembly 100.

[0031] A cover plate 240 is provided on the electromagnet component 220. An anti-rotation notch 241 is provided on the cover plate 240 to prevent the electromagnet component 200 from rotating.

[0032] The nozzle component 300 includes a return spring 310, an armature 320, an armature rod 330, a yoke 340, an iron core 350, a nozzle body 360, a valve rod 370, and a valve rod spring 380.

[0033] The upper end of the return spring 310 is inserted into the stepped hole 130 and acts on the stepped surface between the stepped hole 130 and the intake hole 110.

[0034] The upper middle parts of the armature 320 and the iron core 350 are arranged in the stepped hole 150 of the air inlet joint assembly 100. The upper end of the armature 320 is inserted into the stepped hole 140, and the stepped surface 322 of the armature 320 contacts the stepped surface 151 between the stepped hole 140 and the stepped hole 150 for positioning, so as to ensure that the return spring 310 has a suitable pre-tension force.

[0035] Coaxial through holes 323 (the aforementioned first through hole), through holes 351 (the aforementioned first through hole) and valve stem holes 361 are respectively arranged inside the armature 320, inside the iron core 350 and inside the nozzle body 360. At the same time, the through holes 323, through holes 351 and valve stem holes 361 are also coaxial with the air inlet hole 110 inside the air inlet joint assembly 100 and the inner hole of the magnetic isolation sleeve 180.

[0036] The armature rod 330 is slidably arranged in the through hole 323 inside the armature 320 and the through hole 351 of the iron core 350. A small shaft 331 is arranged at the upper end of the armature rod 330, and a bushing 332 is fixed on the small shaft 331. The outer peripheral surface of the bushing 332 is in sliding fit with the through hole 323 of the armature 320 to guide and position the armature rod 330; a vent hole 333 is arranged on the bushing 332, and the vent hole 333 penetrates the air inlet hole 110 inside the air inlet joint assembly 100 and the through hole 323 inside the armature 320. The lower end of the return spring 310 acts on the bushing 332.

[0037] The yoke 340 is fixed at the position of the housing 220 of the electromagnet component 200 corresponding to the coil assembly 210 and surrounds the coil assembly 210.

[0038] A flange 352 is arranged at the lower end of the iron core 350. The upper end surface 352a (the aforementioned) of the flange 352 positions the bottom surface of the housing 220 of the electromagnet component 200 and the air inlet joint assembly 100 at the first end face. At the same time, the flange 352 cooperates with the cover plate 240 to flatten the electromagnet component 200.

[0039] A sleeve 352c is arranged on the lower end surface 352b of the flange 352. The upper end of the nozzle body 360 is inserted into the sleeve 352c and is hermetically and tightly attached to the inner end surface 352d of the sleeve 352c by welding.

[0040] The valve stem 370 is slidably arranged in the valve stem hole 361 of the nozzle body 360. The upper end of the valve stem 370 is inserted into the through hole 351 of the iron core 350 and interacts with the lower end of the armature rod 330. An adjusting gasket 380a is arranged between the lower end of the armature rod 330 and the upper end of the valve stem 370 to adjust the stroke of the valve stem 370.

[0041] Inside the upper end of the nozzle body 360, there are provided a stepped hole 362 (the aforementioned third stepped hole), an inclined hole 363, and a stepped hole 364 (the aforementioned fourth stepped hole) that are coaxial with the valve stem hole 361. The diameter of the stepped hole 362 is equal to the large-end diameter of the inclined hole 363. The small-end diameter of the inclined hole 363 is equal to the diameter of the stepped hole 364. The diameter of the stepped hole 364 is larger than the diameter of the valve stem hole 361.

[0042] At the position where the valve stem 370 is located inside the stepped hole 362, there is provided a spring seat 371. The valve stem spring 380 is placed inside the stepped hole 362, the inclined hole 363, and the stepped hole 364. The upper end of the valve stem spring 380 acts on the spring seat 371, and the lower end acts on the stepped surface 365 between the stepped hole 364 and the valve stem hole 361. The valve stem spring 380 is in a pre-compressed state, forming a force that exerts an upward pulling force on the valve stem 370, causing the spherical surface 374 of the valve stem 370 to be in force-fitting contact with the conical surface 366 on the nozzle body 360 to form a seal.

[0043] On the valve stem 370, there is provided a guiding section 372 that is in sliding fit with the valve stem hole 361. The guiding section 372 guides and positions the valve stem 370. On the guiding section 372, there are provided vent holes 373, and the vent holes 373 connect the upper section and the lower section of the valve stem 370.

[0044] At the lower end of the valve stem 370, there is provided a spherical surface 374, and at the lower end of the nozzle body 360, there is provided a conical surface 366. The middle and lower part of the nozzle body 360 is inserted into the cylinder, and the lower end surface 352b of the flange 352 is in sealing contact with the cylinder block.

[0045] The assembly process of the hydrogen injection valve of the present invention is as follows:

[0046] In the first step, assemble the nozzle component 300: Insert the small end of the valve stem 370, that is, the upper end close to the armature rod 330, coaxially from the lower end of the nozzle body 360 upward into the valve stem hole 36, and the spherical surface 374 of the valve stem 370 is in contact with the conical surface 366 on the nozzle body 360. Insert the valve stem spring 380 from the upper end of the nozzle body 360 into the stepped hole 362, the inclined hole 363, and the stepped hole 364. Sleeve the spring seat 371 onto the valve stem 370 with the large end face downward and pre-press the valve stem spring 380 downward until the set compression degree, and then laser penetrate weld the spring seat 371 and the valve stem 370 through the annular groove on the spring seat 371.

[0047] Step 2: Insert the upper end of the nozzle body 360 into the sleeve 352c of the iron core 350, and perform laser welding along the lower end face 352b of the flange 352 of the iron core 350, so that the upper end of the nozzle body 360 is hermetically and tightly welded to the inner end face 352d of the sleeve 352c. Measure the distance between the upper end face 353 of the iron core 350 and the upper end face of the spring seat 371, select a suitable adjusting gasket 380 to meet the stroke requirement of the armature 320, install the selected adjusting gasket 380 on the valve stem 370, make the adjusting gasket 380 contact the valve stem 370, and assemble the armature 320 and the armature rod 330 into an armature assembly on the valve stem 370.

[0048] Step 3: Insert the magnetic isolation sleeve 180 into the stepped hole 150 of the air inlet joint assembly 100 and make the upper end face of the magnetic isolation sleeve 180 contact the stepped surface 190 between the stepped hole 150 and the stepped hole 140, and ensure that the inner hole of the magnetic isolation sleeve 180 is coaxial with the stepped hole 150. Perform laser circular welding on the joint seam between the upper end face of the magnetic isolation sleeve 180 and the stepped surface 190 between the stepped hole 150 and the stepped hole 140. Then insert the upper end of the return spring 310 into the stepped hole 130 and make it contact the stepped surface between the stepped hole 130 and the air inlet hole 110. Then coaxially install the inner hole of the magnetic isolation sleeve 180 on the iron core 350, and weld the magnetic isolation sleeve 180 and the iron core 350 into a whole through the annular groove of the magnetic isolation sleeve 180.

[0049] Step 4: Coaxially install the yoke 340 on the iron core 350 so that the lower end face of the yoke 340 contacts the upper end face 352a of the flange 352 of the iron core 350. Coaxially install the electromagnet component 200 on the armature 320 and the iron core 350 so that the lower end face of the electromagnet component 200 contacts the upper end face 352a of the flange 352 of the iron core 350. Coaxially install the cover plate 240 on the air inlet joint assembly 100 so that the lower end face of the cover plate 240 contacts the upper end face of the yoke 340. Fix the iron core 350, the yoke 340 and the cover plate 240 by seam welding along the upper and lower end faces of the yoke 340.

[0050] Step 5: Perform injection molding on the nozzle body 360 and the housing of the electromagnetic component 200.

[0051] The working principle of the present invention is as follows:

[0052] Hydrogen enters the valve stem hole 361 of the nozzle body 360 through the air inlet hole 110 in the air inlet joint assembly 100, the ventilation hole 333 on the shaft sleeve 332, the through hole 323 of the armature 320, and the through hole 351 of the iron core 350.

[0053] When the electromagnet component 200 is de-energized, since the compressive force of the valve stem spring 380 is greater than the downward pressure of the working hydrogen, the valve stem 370 is pulled upward by the valve stem spring 380, causing the spherical surface 374 of the valve stem 370 to be in force-fitting contact with the conical surface 366 on the nozzle body 360, forming a seal. When the electronic control unit issues an instruction, the electromagnet component 200 is energized, and the armature 320 and the armature rod 330 move downward under the action of the electromagnetic force. When the lower end surface 324 of the armature 320 contacts the upper end surface 353 of the iron core 350, the spherical surface 374 of the valve stem 370 and the conical surface 366 of the nozzle body 360 reach the maximum gap. Hydrogen is ejected through the gap between the conical surface 366 of the nozzle body 360 and the spherical surface 374 of the valve stem 370.

[0054] When the electromagnet component 200 is de-energized, the electromagnetic force decreases to 0. The valve stem 370 is subjected to the upward spring force of the valve stem spring 380, causing the spherical surface 374 of the valve stem 370 to be in force-fitting contact with the conical surface 366 on the nozzle body 360. At this time, the downward pressure of the return spring 310 on the armature 320 keeps a certain gap between the lower end surface 324 of the armature 320 and the upper end surface 353 of the iron core 350. When the gas pressure is less than the spring force, the valve stem 370 moves upward under the action of the spring force, causing the spherical surface 374 of the valve stem 370 to be in force-fitting contact with the conical surface 366 on the nozzle body 360, and the hydrogen injection ends, while a seal is formed. On the other hand, the downward pressure of the air pressure can delay the closing time of the valve stem 370 and reduce the impact between the valve stem 370 and the conical surface 366 on the nozzle body 360.

[0055] As Figure 3 shown, the armature 320 is made of magnetic stainless steel and the upper end surface 322 of the armature 320 is subjected to the pressure of the return spring 310, so that the upper end surface 332a of the bushing 332 on the armature rod 330 is in contact with the upper end surface 320a of the armature 320. When the electromagnet component 200 is energized, magnetic force is generated, and the generated magnetic force attracts the armature 320 to slide in the stepped hole 150 of the intake joint assembly 100 and drives the armature rod 330 to slide downward. After power-off, the magnetic force disappears, the valve stem spring 380 resets and drives the armature 320 to automatically reset.

[0056] For the hydrogen injection valve of the present invention, when it is working and opened, the flow cross-sectional area is large, and the valve stem 370 and the nozzle body 360 are made of high-temperature resistant materials. Therefore, hydrogen can be directly injected into the internal combustion engine combustion chamber. In addition, the electromagnetic force designed for the electromagnet component 200 is much greater than the tension force of the valve stem spring 380. When it is opened, it can open evenly around and the injection flow rate is also uniform and stable, which is more conducive to the mixing of the fuel gas in the engine.

[0057] By adopting the above technical solution, compared with the existing gas injection valves, the present invention, due to the adoption of the balanced valve structure, can adopt a greater pressure and obtain a greater gas flow rate under the same flow area. In addition, the outward-opening injection valve structure can not only obtain a greater injection cone angle, but also play a heat insulation role when closed, which can protect the internal sealing ring. Therefore, the present invention can achieve direct gas injection into the cylinder during the compression stroke, avoiding the backfire problem of PFI. At the same time, the volume efficiency loss caused by the replacement of air by gas in the PFI injection mode can also be solved. In addition, due to the adoption of a high injection pressure, higher energy can be provided within the same injection duration, achieving a higher load.

Claims

1. An in-cylinder hydrogen direct injection valve, characterized in that, Comprising: An intake joint assembly, which has an intake hole therein, and one end of the intake joint assembly is connected to a hydrogen source; An electromagnet component, and the other end of the intake joint assembly is inserted into the electromagnet component; A nozzle component, one end of the nozzle component is inserted into and connected to the other end of the intake joint assembly, the other end of the nozzle component is inserted into the cylinder, and is driven by the electromagnet component to be periodically opened and closed. When the nozzle component is opened, the hydrogen entering the intake hole in the intake joint assembly is quantitatively sprayed into the cylinder through the nozzle component.

2. The in-cylinder hydrogen direct injection valve according to claim 1, characterized in that, The nozzle component includes a return spring, an armature, an armature rod, a yoke, an iron core, a nozzle body, a valve rod, and a valve rod spring; the end face of the other end of the intake joint assembly is hermetically fitted with the first end face of the flange on the iron core; the coil assembly in the electromagnet component surrounds the periphery of the other end of the intake joint assembly, and the yoke surrounds the periphery of the coil assembly; Coaxial first through hole, second through hole and valve rod hole are respectively arranged inside the armature, inside the iron core and inside the nozzle body, and the first through hole, second through hole and valve rod hole are also coaxial with the intake hole in the intake joint assembly; a part of the return spring, the armature and the iron core is placed inside the other end of the intake joint assembly; the armature rod is slidably arranged in the first through hole inside the armature and the second through hole of the iron core, one end of the return spring acts on the intake joint assembly, and the other end of the return spring acts on one end of the armature rod; One end of the valve rod is inserted into the second through hole of the iron core and interacts with the other end of the armature rod, the middle section and the other end of the valve rod are placed in the valve rod hole, the valve rod spring is also placed in the valve rod hole, one end of the valve rod spring acts on the valve rod, and the other end of the valve rod spring acts on the nozzle body; one end of the nozzle body is inserted into the iron core and is hermetically fitted with the iron core; a spherical surface is arranged at the other end of the valve rod, and a conical surface is arranged at the other end of the nozzle body; During the movement of the valve rod, after the spherical surface and the conical surface are hermetically fitted, the nozzle component is closed, and after the spherical surface and the conical surface are separated, the nozzle component is opened, and hydrogen is sprayed into the cylinder through the gap between the spherical surface and the conical surface.

3. The in-cylinder hydrogen direct injection valve according to claim 2, wherein The electromagnet component is limited by the first end face of the flange on the iron core.

4. The in-cylinder hydrogen direct injection injection valve according to claim 3, characterized in that, A cover plate is arranged on the electromagnet component, the cover plate and the iron core cooperate to cover the solenoid valve component flat, and an anti-rotation notch is arranged on the cover plate to prevent the electromagnet component from rotating.

5. The in-cylinder hydrogen direct injection injection valve according to claim 4, characterized in that, A bushing is fixed on the armature rod, the outer peripheral surface of the bushing is slidably matched with the first through hole of the armature to guide and position the armature rod; a vent hole is arranged on the bushing, the vent hole penetrates the intake hole in the intake joint assembly and the first through hole in the armature, and the other end of the return spring acts on the bushing.

6. The in-cylinder hydrogen direct injection valve according to claim 5, characterized in that, A first stepped hole and a second stepped hole are provided at a position of the air inlet hole in the air inlet joint assembly near the return spring. The inner diameter of the first stepped hole is smaller than that of the second stepped hole. One end of the return spring is inserted into the first stepped hole and acts on the stepped surface between the first stepped hole and the air inlet hole. The upper end of the armature is inserted into the second stepped hole, and the upper end surface of the armature contacts the stepped surface of the second stepped hole for positioning, so as to ensure that the return spring has a suitable pre-tension force.

7. The in-cylinder hydrogen direct injection valve according to claim 6, characterized in that, A magnetic isolation sleeve is provided inside the air inlet joint assembly at a position corresponding to the coil assembly.

8. The in-cylinder hydrogen direct injection injection valve according to claim 7, characterized in that, An adjusting gasket is provided between the other end of the armature rod and one end of the valve rod.

9. The in-cylinder hydrogen direct injection injection valve according to claim 8, characterized in that, A third stepped hole, an inclined hole and a fourth stepped hole coaxial with the valve rod hole are provided inside one end of the nozzle body. The diameter of the third stepped hole is equal to the large head diameter of the inclined hole. The small head diameter of the inclined hole is equal to the diameter of the fourth stepped hole. The diameter of the fourth stepped hole is larger than the diameter of the valve rod hole. A spring seat is provided at the position where the valve rod is located in the third stepped hole. One end of the valve rod spring acts on the spring seat, and the other end of the valve rod spring acts on the stepped surface between the fourth stepped hole and the valve rod hole.

10. The in-cylinder hydrogen direct injection valve according to claim 9, characterized in that, A guiding section slidably matched with the valve rod hole is provided on the valve rod. The guiding section guides and positions the valve rod, and a vent hole is provided on the guiding section.

11. The in-cylinder hydrogen direct injection valve according to claim 10, characterized in that, A sleeve is provided on the second end face of the flange of the iron core. One end of the nozzle body is inserted into the sleeve and is hermetically fitted with the sleeve by welding.

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